From nobody Thu Dec 18 04:57:59 2025 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C25FE223DFB; Wed, 23 Apr 2025 06:50:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745391041; cv=none; b=Z7G6e/TKoPZUwAzZ/dvApnn9KlHQdAE8+GFDRcg26wzWJbb2dWR74bWcGi7T4S2aqZlAb3Aqu2l8NdwCgOV+qDE4pB1W380nB+VQQ01EYC6N8jyxLjgVQPjxpS5Vxnj6OFak5EdvgJhx9jbODWnhHbNAap9ccxExnBX0cA+FDmQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745391041; c=relaxed/simple; bh=9REGFnfyFOEyIjAE1cjJKsPFnrPKw4O7e9wg4waN3vU=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=ai93VPH112QVSAZyCftNWMRZoyp1P1LLcxTklijpGhC5xF+Nm+/cn1KuarQAQIdNrKBfrhhc1s9p4as8yqC12R8/bKFYrEU0NcJUKGszxpiCs/QwFNULckHOU5+XnmRALK7qrkBM0Wo4YhmO4iPRkue1oArJ5NXM/G8nFST6wKg= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de; spf=pass smtp.mailfrom=linutronix.de; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=M+oK8mcC; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=tPgFZ0il; arc=none smtp.client-ip=193.142.43.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="M+oK8mcC"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="tPgFZ0il" From: Nam Cao DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1745391032; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=9REGFnfyFOEyIjAE1cjJKsPFnrPKw4O7e9wg4waN3vU=; b=M+oK8mcCxPmkSTRolSOmcElhvwHEgJHBtX5ImHx8qONeIGZo5k6VDGssftg/lz9lULkryL Ansv0nNhJMP58zrVa8Ts7gufHquTHsQ8zJhUvNUXWYqedk7j9zFGrydzlJCM5fwnNc5XDp RhfruS8gw9cgW+n6ydQGzo1GUiflI466uo8OMPAdHuZBXbCeggGHTj2N2PJ63oP3tFKp5T pcxtEwgJkia7yPhfubUMTc6fJL9EyxvbZBQKKikgFcHl0Z08SGC9FnEcLsrnMCVajhK606 7OXxoM+vA8ixYf787bXHCLMUaraM9FFCZVZ7zuNaabGN0hQUwDw1hc+6oDUiSA== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1745391032; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=9REGFnfyFOEyIjAE1cjJKsPFnrPKw4O7e9wg4waN3vU=; b=tPgFZ0ilaz4zAyLrHPnEztzAYkSkSwOcvwohA/VSWh8w6EljxOSvkSVcDevkGrwIYvJ+IK uZ+2jZ94fAJC51Cw== To: Steven Rostedt , Gabriele Monaco , linux-trace-kernel@vger.kernel.org, linux-kernel@vger.kernel.org Cc: john.ogness@linutronix.de, Nam Cao Subject: [PATCH v4 01/22] rv: Add #undef TRACE_INCLUDE_FILE Date: Wed, 23 Apr 2025 08:49:56 +0200 Message-Id: <22e7471794f399a61cafb695c0c388dea10a5976.1745390829.git.namcao@linutronix.de> In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Without "#undef TRACE_INCLUDE_FILE", there could be a build error due to TRACE_INCLUDE_FILE being redefined. Therefore add it. Also fix a typo while at it. Reviewed-by: Gabriele Monaco Signed-off-by: Nam Cao --- kernel/trace/rv/rv_trace.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/kernel/trace/rv/rv_trace.h b/kernel/trace/rv/rv_trace.h index 422b75f58891..99c3801616d4 100644 --- a/kernel/trace/rv/rv_trace.h +++ b/kernel/trace/rv/rv_trace.h @@ -129,8 +129,9 @@ DECLARE_EVENT_CLASS(error_da_monitor_id, #endif /* CONFIG_DA_MON_EVENTS_ID */ #endif /* _TRACE_RV_H */ =20 -/* This part ust be outside protection */ +/* This part must be outside protection */ #undef TRACE_INCLUDE_PATH #define TRACE_INCLUDE_PATH . +#undef TRACE_INCLUDE_FILE #define TRACE_INCLUDE_FILE rv_trace #include --=20 2.39.5 From nobody Thu Dec 18 04:57:59 2025 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6CAC2267385; Wed, 23 Apr 2025 06:50:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745391042; cv=none; b=dfBwLBKNkj9uQd3Vnjr6EYbIxpSRbBSP6DfRCYQVZqnaDiKvaDviyLxs9smQwJ9rDVX/xXtO6TxZG/FIVbP/mq14X/Lbmf8p7Pg1I0OjUU+p9clGNuehQCdcbhYWahLWQyVPPtCoq1iiXDMfFHEBtsqO0qFgwGVkaiqcJM5A9ws= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745391042; c=relaxed/simple; bh=XLIwTZUPwuaMfKzDKP66sLEghroVG+ojtKHrNXY4pD4=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=XF4+bIpECf5I/lTMIptlKVABP6FwM9r6fLC9vIAPFlIuMDsap5aHpbPBeIujuQg+cBL9A1VVyYpXEFmmHjOiSJN1CKdvdGtWkToZuSfzCf39De0xhVJe5JnIh9coCLr7RigyeUPnwdDxmZWk+lSSkWCdj38uFoZMN+gsn77SUgY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de; spf=pass smtp.mailfrom=linutronix.de; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=40WVmQL6; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=6MXxcRmN; arc=none smtp.client-ip=193.142.43.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="40WVmQL6"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="6MXxcRmN" From: Nam Cao DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1745391032; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=nLbwQQqpQiGUQcMTHG6q9ADA6juJe7ifpWtTjSR5QDs=; b=40WVmQL6xnVM0wcVyHLcSNje2W6yh++0nh/JJzO/0HIb4cMyCGBwgStVX842BmbrC2u37/ YJVD0B307ANPDB7fhGqMlLiZw6rBnZzi2HCaLkMQpA+VLALru1+lf7Y334WLYB0lVFza6l ScnmnR5jrM71SmFsQFFz/ZZJzUWyqeTIQGBynGCEoeA6xq8jTKzhmrmhPy2JAdXNNolp8l f0uCcZ1JoI2vJPrEwzfVJSd3Yxf3qFNuCkkEa3uGEUGy8Kwtg1p++u3eGZu5BU+AhZGbq/ X/zSG7Kcrr7Ldyw3PQiBCjitabqRlW/1y+MA7W6H8q6ui+SwhdJESDtfgf+saQ== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1745391032; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=nLbwQQqpQiGUQcMTHG6q9ADA6juJe7ifpWtTjSR5QDs=; b=6MXxcRmNOW5sQ2aEy72O1B9rAgoxQLazjFoES0xkH1xy3aBRnZfA1XtHZW4tZOcs0kmsPD NTx/E+T/eDLODLDw== To: Steven Rostedt , Gabriele Monaco , linux-trace-kernel@vger.kernel.org, linux-kernel@vger.kernel.org Cc: john.ogness@linutronix.de, Nam Cao , Petr Mladek , Sergey Senozhatsky Subject: [PATCH v4 02/22] printk: Make vprintk_deferred() public Date: Wed, 23 Apr 2025 08:49:57 +0200 Message-Id: <63f538ac0cef81e9019f23f041e9a1b26a03f30e.1745390829.git.namcao@linutronix.de> In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" vprintk_deferred() is useful for implementing runtime verification reactors. Make it public. Signed-off-by: Nam Cao Reviewed-by: Petr Mladek --- Cc: John Ogness Cc: Sergey Senozhatsky --- include/linux/printk.h | 5 +++++ kernel/printk/internal.h | 1 - 2 files changed, 5 insertions(+), 1 deletion(-) diff --git a/include/linux/printk.h b/include/linux/printk.h index 4217a9f412b2..1b7eebe13f14 100644 --- a/include/linux/printk.h +++ b/include/linux/printk.h @@ -154,6 +154,7 @@ int vprintk_emit(int facility, int level, =20 asmlinkage __printf(1, 0) int vprintk(const char *fmt, va_list args); +__printf(1, 0) int vprintk_deferred(const char *fmt, va_list args); =20 asmlinkage __printf(1, 2) __cold int _printk(const char *fmt, ...); @@ -213,6 +214,10 @@ int vprintk(const char *s, va_list args) { return 0; } +__printf(1, 0) int vprintk_deferred(const char *fmt, va_list args) +{ + return 0; +} static inline __printf(1, 2) __cold int _printk(const char *s, ...) { diff --git a/kernel/printk/internal.h b/kernel/printk/internal.h index a91bdf802967..28afdeb58412 100644 --- a/kernel/printk/internal.h +++ b/kernel/printk/internal.h @@ -71,7 +71,6 @@ int vprintk_store(int facility, int level, const char *fmt, va_list args); =20 __printf(1, 0) int vprintk_default(const char *fmt, va_list args); -__printf(1, 0) int vprintk_deferred(const char *fmt, va_list args); =20 void __printk_safe_enter(void); void __printk_safe_exit(void); --=20 2.39.5 From nobody Thu Dec 18 04:57:59 2025 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6CB30267387; Wed, 23 Apr 2025 06:50:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745391042; cv=none; b=U4WuNvNYVfEyyS0zvjqsVNMyuIK+hOlP0cXFhApnqk45fWB7mBQHHxKWasoQifLDoHl/dtHXvxYlF0TFA7/WxnvPCUzzf/POYkm8ZHvqEmv7aI7we1qdpi1OcD6bbuH9kz0Id3CQ7HTfAG+xtVXLfqA31oDfKDFMo2CJ7oXzF3s= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745391042; c=relaxed/simple; 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dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="tAmVQyQO" From: Nam Cao DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1745391032; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=oFLrSzrjWHDz7RuayXpBZRe6H/UMM09LYKMjG3482lM=; b=Nppi7df9anCwBo0a8Br+8hHmwxrwVL3JFkE82K1Lb4kHxtoXLPLh75l/fH+do9zxZKf5ye 4XelzoJottr3hgfCAobU/OGGkmaZMub5lVmpWjpOnvgECTpPuZQMB/MdsLGe7ayX3gcqYe YdgjKPrFLGqD/WZsTWe9htT70/WJPbzZDwI8zLcCmTMBwhweUT2Q1gKoAccwa9/vvCA9Yy us5NUWF/Yb2HiLaodVHWsRXO3ESzKoXHjyOYQEogAkg7bOczKiFB60LhjnhHgEzc8ON390 8WPZcUkiZwcx4T+jxWq17HgTXNZFwhnFQ4VKB3S/DiBvad+rUL+BW2v40pycvA== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1745391032; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=oFLrSzrjWHDz7RuayXpBZRe6H/UMM09LYKMjG3482lM=; b=tAmVQyQOT95bmmb6Vp92QPT0KYmKoesPfxunW6s5ZwjPpMfK9yIPlhceGd71UNlf6kpyKS NaJOPXUIymgzywBg== To: Steven Rostedt , Gabriele Monaco , linux-trace-kernel@vger.kernel.org, linux-kernel@vger.kernel.org Cc: john.ogness@linutronix.de, Nam Cao , Petr Mladek , Sergey Senozhatsky Subject: [PATCH v4 03/22] panic: Add vpanic() Date: Wed, 23 Apr 2025 08:49:58 +0200 Message-Id: <48997b4e1fff2406135b38c922b287030ec63aa9.1745390829.git.namcao@linutronix.de> In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" vpanic() is useful for implementing runtime verification reactors. Add it. Signed-off-by: Nam Cao Reviewed-by: Petr Mladek --- Cc: John Ogness Cc: Sergey Senozhatsky --- include/linux/panic.h | 3 +++ kernel/panic.c | 17 ++++++++++++----- 2 files changed, 15 insertions(+), 5 deletions(-) diff --git a/include/linux/panic.h b/include/linux/panic.h index 54d90b6c5f47..3522f8c441f4 100644 --- a/include/linux/panic.h +++ b/include/linux/panic.h @@ -3,6 +3,7 @@ #define _LINUX_PANIC_H =20 #include +#include #include =20 struct pt_regs; @@ -10,6 +11,8 @@ struct pt_regs; extern long (*panic_blink)(int state); __printf(1, 2) void panic(const char *fmt, ...) __noreturn __cold; +__printf(1, 0) +void vpanic(const char *fmt, va_list args) __noreturn __cold; void nmi_panic(struct pt_regs *regs, const char *msg); void check_panic_on_warn(const char *origin); extern void oops_enter(void); diff --git a/kernel/panic.c b/kernel/panic.c index d8635d5cecb2..df799d784b61 100644 --- a/kernel/panic.c +++ b/kernel/panic.c @@ -277,17 +277,16 @@ static void panic_other_cpus_shutdown(bool crash_kexe= c) } =20 /** - * panic - halt the system + * vpanic - halt the system * @fmt: The text string to print * * Display a message, then perform cleanups. * * This function never returns. */ -void panic(const char *fmt, ...) +void vpanic(const char *fmt, va_list args) { static char buf[1024]; - va_list args; long i, i_next =3D 0, len; int state =3D 0; int old_cpu, this_cpu; @@ -338,9 +337,7 @@ void panic(const char *fmt, ...) =20 console_verbose(); bust_spinlocks(1); - va_start(args, fmt); len =3D vscnprintf(buf, sizeof(buf), fmt, args); - va_end(args); =20 if (len && buf[len - 1] =3D=3D '\n') buf[len - 1] =3D '\0'; @@ -477,7 +474,17 @@ void panic(const char *fmt, ...) mdelay(PANIC_TIMER_STEP); } } +EXPORT_SYMBOL(vpanic); =20 +/* Identical to vpanic(), except it takes variadic arguments instead of va= _list */ +void panic(const char *fmt, ...) +{ + va_list args; + + va_start(args, fmt); + vpanic(fmt, args); + va_end(args); +} EXPORT_SYMBOL(panic); =20 #define TAINT_FLAG(taint, _c_true, _c_false, _module) \ --=20 2.39.5 From nobody Thu Dec 18 04:57:59 2025 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6CB8E267392; 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charset="utf-8" Each RV monitor has one static buffer to send to the reactors. If multiple errors are detected simultaneously, the one buffer could be overwritten. Instead, leave it to the reactors to handle buffering. Reviewed-by: Gabriele Monaco Signed-off-by: Nam Cao --- Cc: Petr Mladek Cc: John Ogness Cc: Sergey Senozhatsky --- include/linux/rv.h | 9 +++++-- include/rv/da_monitor.h | 45 +++++++------------------------- kernel/trace/rv/reactor_panic.c | 8 ++++-- kernel/trace/rv/reactor_printk.c | 8 ++++-- kernel/trace/rv/rv_reactors.c | 2 +- 5 files changed, 30 insertions(+), 42 deletions(-) diff --git a/include/linux/rv.h b/include/linux/rv.h index 3452b5e4b29e..9428e62eb8e9 100644 --- a/include/linux/rv.h +++ b/include/linux/rv.h @@ -38,7 +38,7 @@ union rv_task_monitor { struct rv_reactor { const char *name; const char *description; - void (*react)(char *msg); + __printf(1, 2) void (*react)(const char *msg, ...); }; #endif =20 @@ -50,7 +50,7 @@ struct rv_monitor { void (*disable)(void); void (*reset)(void); #ifdef CONFIG_RV_REACTORS - void (*react)(char *msg); + __printf(1, 2) void (*react)(const char *msg, ...); #endif }; =20 @@ -64,6 +64,11 @@ void rv_put_task_monitor_slot(int slot); bool rv_reacting_on(void); int rv_unregister_reactor(struct rv_reactor *reactor); int rv_register_reactor(struct rv_reactor *reactor); +#else +static inline bool rv_reacting_on(void) +{ + return false; +} #endif /* CONFIG_RV_REACTORS */ =20 #endif /* CONFIG_RV */ diff --git a/include/rv/da_monitor.h b/include/rv/da_monitor.h index 510c88bfabd4..15f9ed4e4bb6 100644 --- a/include/rv/da_monitor.h +++ b/include/rv/da_monitor.h @@ -19,45 +19,22 @@ #ifdef CONFIG_RV_REACTORS =20 #define DECLARE_RV_REACTING_HELPERS(name, type) \ -static char REACT_MSG_##name[1024]; \ - \ -static inline char *format_react_msg_##name(type curr_state, type event) = \ -{ \ - snprintf(REACT_MSG_##name, 1024, \ - "rv: monitor %s does not allow event %s on state %s\n", \ - #name, \ - model_get_event_name_##name(event), \ - model_get_state_name_##name(curr_state)); \ - return REACT_MSG_##name; \ -} \ - \ -static void cond_react_##name(char *msg) \ +static void cond_react_##name(type curr_state, type event) \ { \ - if (rv_##name.react) \ - rv_##name.react(msg); \ -} \ - \ -static bool rv_reacting_on_##name(void) \ -{ \ - return rv_reacting_on(); \ + if (!rv_reacting_on() || !rv_##name.react) \ + return; \ + rv_##name.react("rv: monitor %s does not allow event %s on state %s\n", = \ + #name, \ + model_get_event_name_##name(event), \ + model_get_state_name_##name(curr_state)); \ } =20 #else /* CONFIG_RV_REACTOR */ =20 #define DECLARE_RV_REACTING_HELPERS(name, type) \ -static inline char *format_react_msg_##name(type curr_state, type event) = \ -{ \ - return NULL; \ -} \ - \ -static void cond_react_##name(char *msg) \ +static void cond_react_##name(type curr_state, type event) \ { \ return; \ -} \ - \ -static bool rv_reacting_on_##name(void) \ -{ \ - return 0; \ } #endif =20 @@ -170,8 +147,7 @@ da_event_##name(struct da_monitor *da_mon, enum events_= ##name event) \ return true; \ } \ \ - if (rv_reacting_on_##name()) \ - cond_react_##name(format_react_msg_##name(curr_state, event)); \ + cond_react_##name(curr_state, event); \ \ trace_error_##name(model_get_state_name_##name(curr_state), \ model_get_event_name_##name(event)); \ @@ -202,8 +178,7 @@ static inline bool da_event_##name(struct da_monitor *d= a_mon, struct task_struct return true; \ } \ \ - if (rv_reacting_on_##name()) \ - cond_react_##name(format_react_msg_##name(curr_state, event)); \ + cond_react_##name(curr_state, event); \ \ trace_error_##name(tsk->pid, \ model_get_state_name_##name(curr_state), \ diff --git a/kernel/trace/rv/reactor_panic.c b/kernel/trace/rv/reactor_pani= c.c index 0186ff4cbd0b..74c6bcc2c749 100644 --- a/kernel/trace/rv/reactor_panic.c +++ b/kernel/trace/rv/reactor_panic.c @@ -13,9 +13,13 @@ #include #include =20 -static void rv_panic_reaction(char *msg) +__printf(1, 2) static void rv_panic_reaction(const char *msg, ...) { - panic(msg); + va_list args; + + va_start(args, msg); + vpanic(msg, args); + va_end(args); } =20 static struct rv_reactor rv_panic =3D { diff --git a/kernel/trace/rv/reactor_printk.c b/kernel/trace/rv/reactor_pri= ntk.c index 178759dbf89f..2dae2916c05f 100644 --- a/kernel/trace/rv/reactor_printk.c +++ b/kernel/trace/rv/reactor_printk.c @@ -12,9 +12,13 @@ #include #include =20 -static void rv_printk_reaction(char *msg) +__printf(1, 2) static void rv_printk_reaction(const char *msg, ...) { - printk_deferred(msg); + va_list args; + + va_start(args, msg); + vprintk_deferred(msg, args); + va_end(args); } =20 static struct rv_reactor rv_printk =3D { diff --git a/kernel/trace/rv/rv_reactors.c b/kernel/trace/rv/rv_reactors.c index 9501ca886d83..740603670dd1 100644 --- a/kernel/trace/rv/rv_reactors.c +++ b/kernel/trace/rv/rv_reactors.c @@ -490,7 +490,7 @@ void reactor_cleanup_monitor(struct rv_monitor_def *mde= f) /* * Nop reactor register */ -static void rv_nop_reaction(char *msg) +__printf(1, 2) static void rv_nop_reaction(const char *msg, ...) { } =20 --=20 2.39.5 From nobody Thu Dec 18 04:57:59 2025 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E4D1F267712; Wed, 23 Apr 2025 06:50:42 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; 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charset="utf-8" A generated container's Kconfig has an incorrect line: select DA_MON_EVENTS_IMPLICIT This is due to container generation uses the same template Kconfig file as deterministic automaton monitor. Therefore, make a separate Kconfig template for container which has only the necessaries for container. Reviewed-by: Gabriele Monaco Signed-off-by: Nam Cao --- Alternatively, we could also modify the Python scripts. I tried both and this solution seems cleaner. --- tools/verification/dot2/dot2k.py | 3 ++- tools/verification/dot2/dot2k_templates/Kconfig_container | 5 +++++ 2 files changed, 7 insertions(+), 1 deletion(-) create mode 100644 tools/verification/dot2/dot2k_templates/Kconfig_contain= er diff --git a/tools/verification/dot2/dot2k.py b/tools/verification/dot2/dot= 2k.py index 745d35a4a379..dd4b5528a4f2 100644 --- a/tools/verification/dot2/dot2k.py +++ b/tools/verification/dot2/dot2k.py @@ -35,6 +35,7 @@ class dot2k(Dot2c): self.states =3D [] self.main_c =3D self.__read_file(self.monitor_templates_dir + = "main_container.c") self.main_h =3D self.__read_file(self.monitor_templates_dir + = "main_container.h") + self.kconfig =3D self.__read_file(self.monitor_templates_dir += "Kconfig_container") else: super().__init__(file_path, extra_params.get("model_name")) =20 @@ -44,7 +45,7 @@ class dot2k(Dot2c): self.monitor_type =3D MonitorType self.main_c =3D self.__read_file(self.monitor_templates_dir + = "main.c") self.trace_h =3D self.__read_file(self.monitor_templates_dir += "trace.h") - self.kconfig =3D self.__read_file(self.monitor_templates_dir + "Kc= onfig") + self.kconfig =3D self.__read_file(self.monitor_templates_dir += "Kconfig") self.enum_suffix =3D "_%s" % self.name self.description =3D extra_params.get("description", self.name) or= "auto-generated" self.auto_patch =3D extra_params.get("auto_patch") diff --git a/tools/verification/dot2/dot2k_templates/Kconfig_container b/to= ols/verification/dot2/dot2k_templates/Kconfig_container new file mode 100644 index 000000000000..a606111949c2 --- /dev/null +++ b/tools/verification/dot2/dot2k_templates/Kconfig_container @@ -0,0 +1,5 @@ +config RV_MON_%%MODEL_NAME_UP%% + depends on RV + bool "%%MODEL_NAME%% monitor" + help + %%DESCRIPTION%% --=20 2.39.5 From nobody Thu Dec 18 04:57:59 2025 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E4DA226772A; 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a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1745391033; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=+WCyvCXKRf/F4qW3dfDg+7ZIfppz2CYPNGxpMfZcwg0=; b=5pmgoeKrcwl1JMPELFloBXAflWkFULzhvztPt6x7oe9PPUi5nHusbpTPBxoJu1fzTuwqAm mIIGbOr2/DTJIuDg== To: Steven Rostedt , Gabriele Monaco , linux-trace-kernel@vger.kernel.org, linux-kernel@vger.kernel.org Cc: john.ogness@linutronix.de, Nam Cao Subject: [PATCH v4 06/22] verification/dot2k: Remove __buff_to_string() Date: Wed, 23 Apr 2025 08:50:01 +0200 Message-Id: In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" str.join() can do what __buff_to_string() does. Therefore replace __buff_to_string() to make the scripts more pythonic. Reviewed-by: Gabriele Monaco Signed-off-by: Nam Cao --- tools/verification/dot2/dot2k.py | 21 ++++++--------------- 1 file changed, 6 insertions(+), 15 deletions(-) diff --git a/tools/verification/dot2/dot2k.py b/tools/verification/dot2/dot= 2k.py index dd4b5528a4f2..0922754454b9 100644 --- a/tools/verification/dot2/dot2k.py +++ b/tools/verification/dot2/dot2k.py @@ -109,15 +109,6 @@ class dot2k(Dot2c): fd.close() return content =20 - def __buff_to_string(self, buff): - string =3D "" - - for line in buff: - string =3D string + line + "\n" - - # cut off the last \n - return string[:-1] - def fill_monitor_type(self): return self.monitor_type.upper() =20 @@ -148,19 +139,19 @@ class dot2k(Dot2c): buff.append("\tda_%s_%s(%s%s);" % (handle, self.name, even= t, self.enum_suffix)); buff.append("}") buff.append("") - return self.__buff_to_string(buff) + return '\n'.join(buff) =20 def fill_tracepoint_attach_probe(self): buff =3D [] for event in self.events: buff.append("\trv_attach_trace_probe(\"%s\", /* XXX: tracepoin= t */, handle_%s);" % (self.name, event)) - return self.__buff_to_string(buff) + return '\n'.join(buff) =20 def fill_tracepoint_detach_helper(self): buff =3D [] for event in self.events: buff.append("\trv_detach_trace_probe(\"%s\", /* XXX: tracepoin= t */, handle_%s);" % (self.name, event)) - return self.__buff_to_string(buff) + return '\n'.join(buff) =20 def fill_main_c(self): main_c =3D self.main_c @@ -210,7 +201,7 @@ class dot2k(Dot2c): buff =3D self.fill_model_h_header() buff +=3D self.format_model() =20 - return self.__buff_to_string(buff) + return '\n'.join(buff) =20 def fill_monitor_class_type(self): if self.monitor_type =3D=3D "per_task": @@ -242,7 +233,7 @@ class dot2k(Dot2c): tp_args_c =3D ", ".join([b for a,b in tp_args]) buff.append(" TP_PROTO(%s)," % tp_proto_c) buff.append(" TP_ARGS(%s)" % tp_args_c) - return self.__buff_to_string(buff) + return '\n'.join(buff) =20 def fill_monitor_deps(self): buff =3D [] @@ -250,7 +241,7 @@ class dot2k(Dot2c): if self.parent: buff.append(" depends on RV_MON_%s" % self.parent.upper()) buff.append(" default y") - return self.__buff_to_string(buff) + return '\n'.join(buff) =20 def fill_trace_h(self): trace_h =3D self.trace_h --=20 2.39.5 From nobody Thu Dec 18 04:57:59 2025 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6F842267B61; 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a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1745391034; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=CbJkEpwB3OdGpjoifJXvu2A5D6lki3gos/XOzAV2UjA=; b=MH8ho3vVqMvjjqIN4y3kf0OZ0VOi2+XylCKwqaV1t7ZWY5ab6rtugaKD0bvuCIL2P3qRon LAkbPon+1/NpMHDg== To: Steven Rostedt , Gabriele Monaco , linux-trace-kernel@vger.kernel.org, linux-kernel@vger.kernel.org Cc: john.ogness@linutronix.de, Nam Cao Subject: [PATCH v4 07/22] verification/dot2k: Replace is_container() hack with subparsers Date: Wed, 23 Apr 2025 08:50:02 +0200 Message-Id: <128117181d510fa00c92ed7a7e518e08d123cd31.1745390829.git.namcao@linutronix.de> In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" dot2k is used for both generating deterministic automaton (DA) monitor and generating container monitor. Generating DA monitor and generating container requires different parameters. This is implemented by peeking at sys.argv and check whether "--container" is specified, and use that information to make some parameters optional or required. This works, but is quite hacky and ugly. Replace this hack with Python's built-in subparsers. The old commands: python3 dot2/dot2k -d wip.dot -t per_cpu python3 dot2/dot2k -n sched --container are equivalent to the new commands: python3 dot2/dot2k monitor -d wip.dot -t per_cpu python3 dot2/dot2k container -n sched Reviewed-by: Gabriele Monaco Signed-off-by: Nam Cao --- tools/verification/dot2/dot2k | 37 +++++++++++++++++--------------- tools/verification/dot2/dot2k.py | 2 +- 2 files changed, 21 insertions(+), 18 deletions(-) diff --git a/tools/verification/dot2/dot2k b/tools/verification/dot2/dot2k index 767064f415e7..133fb17d9d47 100644 --- a/tools/verification/dot2/dot2k +++ b/tools/verification/dot2/dot2k @@ -13,30 +13,33 @@ if __name__ =3D=3D '__main__': import argparse import sys =20 - def is_container(): - """Should work even before parsing the arguments""" - return "-c" in sys.argv or "--container" in sys.argv - parser =3D argparse.ArgumentParser(description=3D'transform .dot file = into kernel rv monitor') - parser.add_argument('-d', "--dot", dest=3D"dot_file", required=3Dnot i= s_container()) - parser.add_argument('-t', "--monitor_type", dest=3D"monitor_type", req= uired=3Dnot is_container(), - help=3Df"Available options: {', '.join(dot2k.monit= or_types.keys())}") - parser.add_argument('-n', "--model_name", dest=3D"model_name", require= d=3Dis_container()) parser.add_argument("-D", "--description", dest=3D"description", requi= red=3DFalse) parser.add_argument("-a", "--auto_patch", dest=3D"auto_patch", action=3D"store_true", required=3DFalse, help=3D"Patch the kernel in place") - parser.add_argument("-p", "--parent", dest=3D"parent", - required=3DFalse, help=3D"Create a monitor nested = to parent") - parser.add_argument("-c", "--container", dest=3D"container", - action=3D"store_true", required=3DFalse, - help=3D"Create an empty monitor to be used as a co= ntainer") + + subparsers =3D parser.add_subparsers(dest=3D"subcmd", required=3DTrue) + + monitor_parser =3D subparsers.add_parser("monitor") + monitor_parser.add_argument('-n', "--model_name", dest=3D"model_name") + monitor_parser.add_argument("-p", "--parent", dest=3D"parent", + required=3DFalse, help=3D"Create a monitor= nested to parent") + monitor_parser.add_argument('-d', "--dot", dest=3D"dot_file") + monitor_parser.add_argument('-t', "--monitor_type", dest=3D"monitor_ty= pe", + help=3Df"Available options: {', '.join(dot= 2k.monitor_types.keys())}") + + container_parser =3D subparsers.add_parser("container") + container_parser.add_argument('-n', "--model_name", dest=3D"model_name= ", required=3DTrue) + params =3D parser.parse_args() =20 - if not is_container(): - print("Opening and parsing the dot file %s" % params.dot_file) try: - monitor=3Ddot2k(params.dot_file, params.monitor_type, vars(params)) + if params.subcmd =3D=3D "monitor": + print("Opening and parsing the dot file %s" % params.dot_file) + monitor =3D dot2k(params.dot_file, params.monitor_type, vars(p= arams)) + else: + monitor =3D dot2k(None, None, vars(params)) except Exception as e: print('Error: '+ str(e)) print("Sorry : :-(") @@ -45,7 +48,7 @@ if __name__ =3D=3D '__main__': print("Writing the monitor into the directory %s" % monitor.name) monitor.print_files() print("Almost done, checklist") - if not is_container(): + if params.subcmd =3D=3D "monitor": print(" - Edit the %s/%s.c to add the instrumentation" % (monitor= .name, monitor.name)) print(monitor.fill_tracepoint_tooltip()) print(monitor.fill_makefile_tooltip()) diff --git a/tools/verification/dot2/dot2k.py b/tools/verification/dot2/dot= 2k.py index 0922754454b9..9ec99e297012 100644 --- a/tools/verification/dot2/dot2k.py +++ b/tools/verification/dot2/dot2k.py @@ -19,7 +19,7 @@ class dot2k(Dot2c): monitor_type =3D "per_cpu" =20 def __init__(self, file_path, MonitorType, extra_params=3D{}): - self.container =3D extra_params.get("container") + self.container =3D extra_params.get("subcmd") =3D=3D "container" self.parent =3D extra_params.get("parent") self.__fill_rv_templates_dir() =20 --=20 2.39.5 From nobody Thu Dec 18 04:57:59 2025 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6F79D267B16; 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dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=dCnUkPrm; arc=none smtp.client-ip=193.142.43.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="jiIdOD/G"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="dCnUkPrm" From: Nam Cao DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1745391034; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=QrTG+If+tj0i64ta81V4qn3gNx721oseNH6iwdhWG4c=; b=jiIdOD/Gq+dt6ZTtm37ezUMFZDRHpp6hHE9FTSByiKXQqfgYOlhcr0B3zLU/EH0aIIG1fn jPwrkTmhrlgvwr34f73wgq1Djuu/StaIQopb8KZiJVs8bHvvOj5bEMtTUclYzzUyEURAJg l8unszhAEI1ddkQH2vTJcdSOZXhSX3nWovAGusjqEuVQlF/O5p+SGLyCBGtnidpFUAYWId phv2NDKAd7BU3X2UJOhtdUiQ01nepdD5bgWDwl/1rzdKdm8SldBVod6Gu8iPwBX/UsOphN YyywH8z3b3Z2Z6zSDrDvsg25BEPYKVTQKAzd9xHNzM1xR+cQJLV6qcamyU+FQA== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1745391034; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=QrTG+If+tj0i64ta81V4qn3gNx721oseNH6iwdhWG4c=; b=dCnUkPrm4nGVIHfWXgK0b2wRsN8P4Q3sQnyNrr/Fbk543DrSr9w5vrgEb46avQxSahRXsQ 9l/8fjn/tEXwcyBQ== To: Steven Rostedt , Gabriele Monaco , linux-trace-kernel@vger.kernel.org, linux-kernel@vger.kernel.org Cc: john.ogness@linutronix.de, Nam Cao Subject: [PATCH v4 08/22] rv: rename CONFIG_DA_MON_EVENTS to CONFIG_RV_MON_EVENTS Date: Wed, 23 Apr 2025 08:50:03 +0200 Message-Id: <2ad919954e49991898581564e4d04c21a9478548.1745390829.git.namcao@linutronix.de> In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" CONFIG_DA_MON_EVENTS is not specific to deterministic automaton. It could be used for other monitor types. Therefore rename it to CONFIG_RV_MON_EVENTS. This prepares for the introduction of linear temporal logic monitor. Reviewed-by: Gabriele Monaco Signed-off-by: Nam Cao --- kernel/trace/rv/Kconfig | 6 +++--- kernel/trace/rv/rv.c | 2 +- 2 files changed, 4 insertions(+), 4 deletions(-) diff --git a/kernel/trace/rv/Kconfig b/kernel/trace/rv/Kconfig index b39f36013ef2..6cdffc04b73c 100644 --- a/kernel/trace/rv/Kconfig +++ b/kernel/trace/rv/Kconfig @@ -1,14 +1,14 @@ # SPDX-License-Identifier: GPL-2.0-only # -config DA_MON_EVENTS +config RV_MON_EVENTS bool =20 config DA_MON_EVENTS_IMPLICIT - select DA_MON_EVENTS + select RV_MON_EVENTS bool =20 config DA_MON_EVENTS_ID - select DA_MON_EVENTS + select RV_MON_EVENTS bool =20 menuconfig RV diff --git a/kernel/trace/rv/rv.c b/kernel/trace/rv/rv.c index 50344aa9f7f9..dae84deb327d 100644 --- a/kernel/trace/rv/rv.c +++ b/kernel/trace/rv/rv.c @@ -143,7 +143,7 @@ #include #include =20 -#ifdef CONFIG_DA_MON_EVENTS +#ifdef CONFIG_RV_MON_EVENTS #define CREATE_TRACE_POINTS #include #endif --=20 2.39.5 From nobody Thu Dec 18 04:57:59 2025 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DDF36267F44; Wed, 23 Apr 2025 06:50:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745391046; cv=none; b=mXaH6Amp4hJXp+CbjoXi5i4/d0pclI0rFDc9OPOTHbvC14cfbT4h5GvQlg2iOPibvrko9Qh5g8iN/qCGT/VHQzfuEOXjSljdEdBupaiCLl7iCoL/skOXvurM2K1DGD0ZRAz7cGre0f44DF30QRwrwJyKVsoe+z8ep3JExTJjoWE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745391046; c=relaxed/simple; bh=x17mpZ7sX8jAXa8NPlj8BPti3RdNXLLznHqcgpSPNLE=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=H0LOSUjACwj2gyEUuQMNE3K90N90R+YxfKIzCSuOCD70kJ4YL3pL7uuJ707So6tgF/+n9UgdxRPnFknQpLLCpmsL4Ex17/0whyBg7ztsUr4vQm5RHHoKfvr7AUAr19l1/vZhg9i8bBwMWmj9To12yHSsfUuTzv41Wu2uPU/pEG8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de; spf=pass smtp.mailfrom=linutronix.de; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=moZXDYrx; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=1JDC3BZm; arc=none smtp.client-ip=193.142.43.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="moZXDYrx"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="1JDC3BZm" From: Nam Cao DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1745391034; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=HqpK2ecQogzE/riTbJrIMj4alR3/q81koVHuN2ddxBw=; b=moZXDYrxOxAjQAVbK8byCVn9Znjukj+IaifseGZNTCTe2xERQXmXOQIH5JSYBQiZBTlI3/ u3L0b1fj7X6z6+Vzj3LctmW6kHRfA3201ZgUEH7BZDVAurHkB4XAqgFIe2j6qNLJ0fGLEr Y6KiR0xasIPO994j7Z7YA7/W32r52V6LUuQ7bcDJCcyGp2PmoGqFyHp+mzZFxvvcDa6b28 5bh4Y8ZJRrk6AVonAYsPuF6Wv/y6RW7lJZGXCoyV1XL/KcBoTXoZOhWbWdfGZsmbzvzPkI rbMzRyKau1tLca8u7YWmBCF1nmnZ3qg3Lvg8OMEXU671Xo3s4plqNmf82Q038Q== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1745391034; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=HqpK2ecQogzE/riTbJrIMj4alR3/q81koVHuN2ddxBw=; b=1JDC3BZmMJCxjnDpaamB+YJaoU1p00JgjC7mbdCIXDeRDTASxIvAcOiJGp+FhzF/v2U4IY HvDzArqp2oKkGaBw== To: Steven Rostedt , Gabriele Monaco , linux-trace-kernel@vger.kernel.org, linux-kernel@vger.kernel.org Cc: john.ogness@linutronix.de, Nam Cao Subject: [PATCH v4 09/22] verification/dot2k: Prepare the frontend for LTL inclusion Date: Wed, 23 Apr 2025 08:50:04 +0200 Message-Id: In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The dot2k tool has some code that can be reused for linear temporal logic monitor. Prepare its frontend for LTL inclusion: 1. Rename to be generic: rvgen 2. Replace the parameter --dot with 2 parameters: --class: to specific the monitor class, can be 'da' or 'ltl' --spec: the monitor specification file, .dot file for DA, and .ltl file for LTL The old command: python3 dot2/dot2k monitor -d wip.dot -t per_cpu is equivalent to the new commands: python3 rvgen monitor -c da -s wip.dot -t per_cpu Reviewed-by: Gabriele Monaco Signed-off-by: Nam Cao --- tools/verification/{dot2 =3D> rvgen}/Makefile | 10 +++++----- .../{dot2/dot2k =3D> rvgen/__main__.py} | 18 +++++++++++++----- tools/verification/{dot2 =3D> rvgen}/dot2c | 2 +- .../{dot2 =3D> rvgen}/dot2k_templates/Kconfig | 0 .../dot2k_templates/Kconfig_container | 0 .../{dot2 =3D> rvgen}/dot2k_templates/main.c | 0 .../dot2k_templates/main_container.c | 0 .../dot2k_templates/main_container.h | 0 .../{dot2 =3D> rvgen}/dot2k_templates/trace.h | 0 .../{dot2 =3D> rvgen/rvgen}/automata.py | 0 .../{dot2 =3D> rvgen/rvgen}/dot2c.py | 2 +- .../{dot2 =3D> rvgen/rvgen}/dot2k.py | 10 +++++----- 12 files changed, 25 insertions(+), 17 deletions(-) rename tools/verification/{dot2 =3D> rvgen}/Makefile (55%) rename tools/verification/{dot2/dot2k =3D> rvgen/__main__.py} (72%) rename tools/verification/{dot2 =3D> rvgen}/dot2c (97%) rename tools/verification/{dot2 =3D> rvgen}/dot2k_templates/Kconfig (100%) rename tools/verification/{dot2 =3D> rvgen}/dot2k_templates/Kconfig_contai= ner (100%) rename tools/verification/{dot2 =3D> rvgen}/dot2k_templates/main.c (100%) rename tools/verification/{dot2 =3D> rvgen}/dot2k_templates/main_container= .c (100%) rename tools/verification/{dot2 =3D> rvgen}/dot2k_templates/main_container= .h (100%) rename tools/verification/{dot2 =3D> rvgen}/dot2k_templates/trace.h (100%) rename tools/verification/{dot2 =3D> rvgen/rvgen}/automata.py (100%) rename tools/verification/{dot2 =3D> rvgen/rvgen}/dot2c.py (99%) rename tools/verification/{dot2 =3D> rvgen/rvgen}/dot2k.py (98%) diff --git a/tools/verification/dot2/Makefile b/tools/verification/rvgen/Ma= kefile similarity index 55% rename from tools/verification/dot2/Makefile rename to tools/verification/rvgen/Makefile index 021beb07a521..cea9c21c3bce 100644 --- a/tools/verification/dot2/Makefile +++ b/tools/verification/rvgen/Makefile @@ -3,7 +3,7 @@ INSTALL=3Dinstall prefix ?=3D /usr bindir ?=3D $(prefix)/bin mandir ?=3D $(prefix)/share/man -miscdir ?=3D $(prefix)/share/dot2 +miscdir ?=3D $(prefix)/share/rvgen srcdir ?=3D $(prefix)/src =20 PYLIB ?=3D $(shell python3 -c 'import sysconfig; print (sysconfig.get_pa= th("purelib"))') @@ -16,11 +16,11 @@ clean: =20 .PHONY: install install: - $(INSTALL) automata.py -D -m 644 $(DESTDIR)$(PYLIB)/dot2/automata.py - $(INSTALL) dot2c.py -D -m 644 $(DESTDIR)$(PYLIB)/dot2/dot2c.py + $(INSTALL) rvgen/automata.py -D -m 644 $(DESTDIR)$(PYLIB)/rvgen/automata.= py + $(INSTALL) rvgen/dot2c.py -D -m 644 $(DESTDIR)$(PYLIB)/rvgen/dot2c.py $(INSTALL) dot2c -D -m 755 $(DESTDIR)$(bindir)/ - $(INSTALL) dot2k.py -D -m 644 $(DESTDIR)$(PYLIB)/dot2/dot2k.py - $(INSTALL) dot2k -D -m 755 $(DESTDIR)$(bindir)/ + $(INSTALL) rvgen/dot2k.py -D -m 644 $(DESTDIR)$(PYLIB)/rvgen/dot2k.py + $(INSTALL) __main__.py -D -m 755 $(DESTDIR)$(bindir)/rvgen =20 mkdir -p ${miscdir}/ cp -rp dot2k_templates $(DESTDIR)$(miscdir)/ diff --git a/tools/verification/dot2/dot2k b/tools/verification/rvgen/__mai= n__.py similarity index 72% rename from tools/verification/dot2/dot2k rename to tools/verification/rvgen/__main__.py index 133fb17d9d47..994d320ad2d1 100644 --- a/tools/verification/dot2/dot2k +++ b/tools/verification/rvgen/__main__.py @@ -9,11 +9,11 @@ # Documentation/trace/rv/da_monitor_synthesis.rst =20 if __name__ =3D=3D '__main__': - from dot2.dot2k import dot2k + from rvgen.dot2k import dot2k import argparse import sys =20 - parser =3D argparse.ArgumentParser(description=3D'transform .dot file = into kernel rv monitor') + parser =3D argparse.ArgumentParser(description=3D'Generate kernel rv m= onitor') parser.add_argument("-D", "--description", dest=3D"description", requi= red=3DFalse) parser.add_argument("-a", "--auto_patch", dest=3D"auto_patch", action=3D"store_true", required=3DFalse, @@ -25,7 +25,9 @@ if __name__ =3D=3D '__main__': monitor_parser.add_argument('-n', "--model_name", dest=3D"model_name") monitor_parser.add_argument("-p", "--parent", dest=3D"parent", required=3DFalse, help=3D"Create a monitor= nested to parent") - monitor_parser.add_argument('-d', "--dot", dest=3D"dot_file") + monitor_parser.add_argument('-c', "--class", dest=3D"monitor_class", + help=3D"Monitor class, either \"da\" or \"= ltl\"") + monitor_parser.add_argument('-s', "--spec", dest=3D"spec", help=3D"Mon= itor specification file") monitor_parser.add_argument('-t', "--monitor_type", dest=3D"monitor_ty= pe", help=3Df"Available options: {', '.join(dot= 2k.monitor_types.keys())}") =20 @@ -36,8 +38,14 @@ if __name__ =3D=3D '__main__': =20 try: if params.subcmd =3D=3D "monitor": - print("Opening and parsing the dot file %s" % params.dot_file) - monitor =3D dot2k(params.dot_file, params.monitor_type, vars(p= arams)) + print("Opening and parsing the specification file %s" % params= .spec) + if params.monitor_class =3D=3D "da": + monitor =3D dot2k(params.spec, params.monitor_type, vars(p= arams)) + elif params.monitor_class =3D=3D "ltl": + raise NotImplementedError + else: + print("Unknown monitor class:", params.monitor_class) + sys.exit(1) else: monitor =3D dot2k(None, None, vars(params)) except Exception as e: diff --git a/tools/verification/dot2/dot2c b/tools/verification/rvgen/dot2c similarity index 97% rename from tools/verification/dot2/dot2c rename to tools/verification/rvgen/dot2c index 3fe89ab88b65..bf0c67c5b66c 100644 --- a/tools/verification/dot2/dot2c +++ b/tools/verification/rvgen/dot2c @@ -14,7 +14,7 @@ # Documentation/trace/rv/deterministic_automata.rst =20 if __name__ =3D=3D '__main__': - from dot2 import dot2c + from rvgen import dot2c import argparse import sys =20 diff --git a/tools/verification/dot2/dot2k_templates/Kconfig b/tools/verifi= cation/rvgen/dot2k_templates/Kconfig similarity index 100% rename from tools/verification/dot2/dot2k_templates/Kconfig rename to tools/verification/rvgen/dot2k_templates/Kconfig diff --git a/tools/verification/dot2/dot2k_templates/Kconfig_container b/to= ols/verification/rvgen/dot2k_templates/Kconfig_container similarity index 100% rename from tools/verification/dot2/dot2k_templates/Kconfig_container rename to tools/verification/rvgen/dot2k_templates/Kconfig_container diff --git a/tools/verification/dot2/dot2k_templates/main.c b/tools/verific= ation/rvgen/dot2k_templates/main.c similarity index 100% rename from tools/verification/dot2/dot2k_templates/main.c rename to tools/verification/rvgen/dot2k_templates/main.c diff --git a/tools/verification/dot2/dot2k_templates/main_container.c b/too= ls/verification/rvgen/dot2k_templates/main_container.c similarity index 100% rename from tools/verification/dot2/dot2k_templates/main_container.c rename to tools/verification/rvgen/dot2k_templates/main_container.c diff --git a/tools/verification/dot2/dot2k_templates/main_container.h b/too= ls/verification/rvgen/dot2k_templates/main_container.h similarity index 100% rename from tools/verification/dot2/dot2k_templates/main_container.h rename to tools/verification/rvgen/dot2k_templates/main_container.h diff --git a/tools/verification/dot2/dot2k_templates/trace.h b/tools/verifi= cation/rvgen/dot2k_templates/trace.h similarity index 100% rename from tools/verification/dot2/dot2k_templates/trace.h rename to tools/verification/rvgen/dot2k_templates/trace.h diff --git a/tools/verification/dot2/automata.py b/tools/verification/rvgen= /rvgen/automata.py similarity index 100% rename from tools/verification/dot2/automata.py rename to tools/verification/rvgen/rvgen/automata.py diff --git a/tools/verification/dot2/dot2c.py b/tools/verification/rvgen/rv= gen/dot2c.py similarity index 99% rename from tools/verification/dot2/dot2c.py rename to tools/verification/rvgen/rvgen/dot2c.py index fa2816ac7b61..6009caf568d9 100644 --- a/tools/verification/dot2/dot2c.py +++ b/tools/verification/rvgen/rvgen/dot2c.py @@ -13,7 +13,7 @@ # For further information, see: # Documentation/trace/rv/deterministic_automata.rst =20 -from dot2.automata import Automata +from .automata import Automata =20 class Dot2c(Automata): enum_suffix =3D "" diff --git a/tools/verification/dot2/dot2k.py b/tools/verification/rvgen/rv= gen/dot2k.py similarity index 98% rename from tools/verification/dot2/dot2k.py rename to tools/verification/rvgen/rvgen/dot2k.py index 9ec99e297012..e29462413194 100644 --- a/tools/verification/dot2/dot2k.py +++ b/tools/verification/rvgen/rvgen/dot2k.py @@ -8,13 +8,13 @@ # For further information, see: # Documentation/trace/rv/da_monitor_synthesis.rst =20 -from dot2.dot2c import Dot2c +from .dot2c import Dot2c import platform import os =20 class dot2k(Dot2c): monitor_types =3D { "global" : 1, "per_cpu" : 2, "per_task" : 3 } - monitor_templates_dir =3D "dot2/dot2k_templates/" + monitor_templates_dir =3D "rvgen/dot2k_templates/" rv_dir =3D "kernel/trace/rv" monitor_type =3D "per_cpu" =20 @@ -60,14 +60,14 @@ class dot2k(Dot2c): if platform.system() !=3D "Linux": raise OSError("I can only run on Linux.") =20 - kernel_path =3D "/lib/modules/%s/build/tools/verification/dot2/dot= 2k_templates/" % (platform.release()) + kernel_path =3D "/lib/modules/%s/build/tools/verification/rvgen/do= t2k_templates/" % (platform.release()) =20 if os.path.exists(kernel_path): self.monitor_templates_dir =3D kernel_path return =20 - if os.path.exists("/usr/share/dot2/dot2k_templates/"): - self.monitor_templates_dir =3D "/usr/share/dot2/dot2k_template= s/" + if os.path.exists("/usr/share/rvgen/dot2k_templates/"): + self.monitor_templates_dir =3D "/usr/share/rvgen/dot2k_templat= es/" return =20 raise FileNotFoundError("Could not find the template directory, do= you have the kernel source installed?") --=20 2.39.5 From nobody Thu Dec 18 04:57:59 2025 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DC679267F42; Wed, 23 Apr 2025 06:50:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745391046; cv=none; b=LMDt2oAYCEErwoa6VXavs+lVjLZifWYhB0EeDxbnBmE0aTRZe06RatKayDDlPBCRRmHzii4A5x8ZqRj/oAdSwsg8UeqdiC5jTj4m+Df1OfoHsRsumjwtjQ+E5HLeNhdiTb0b48QKqneLPgYzWzdlcQFrWxJ3zFK6YvAELcsI39I= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745391046; c=relaxed/simple; bh=WgE1aO9YUvOmlhuTjVRspOHWrraepbPoXdmSTVuPrz4=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=PfhsVwqsdy4LhSkwQmVR1yqGMSjJypRVzmU0tSa52n+kHqjdJMXuXSkZKHNyudjLPmGWRXP8ooggNaqJENz68XA7IsISGoU8ia6BM/dTtm5TRj8akq9DC151244iIJ3sue/jzS0pHKqgIdSZi8hnRneCWYqG9zbyE/V6tkw24mM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de; spf=pass smtp.mailfrom=linutronix.de; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=k+I8q/jx; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=NPv2p/bb; arc=none smtp.client-ip=193.142.43.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="k+I8q/jx"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="NPv2p/bb" From: Nam Cao DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1745391035; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=WwJdSQU9Mp7gY25s96zSaz0i/71ZPlHWpcJ0xxxuTBQ=; b=k+I8q/jxMigEKy6DMD6q2fvMeqkbiRJ5DqUyRPijDGGDUDyRPY96kEx9JrYJ3HnGuPIpLX TMi0+/SAfGOMli8ug+sbq4Iq+gBOgUX3lvt7M0pXcVHpkMO7ZNHwwE2bOUnxsCmSwL5KbH Ni22BDJs2I0vSq3NzJWlDyDY+nFEXhn45r35O2+fdpmoOjszoXKG+yzHoAfaALvN2YUxMT Q3AYTAqSOtOgXXsEjDfrYPoneS6U3m3WPvDdDRxjBjhTYl3BdT0qMkSEc/nH0g6banX2wu 2Gn6tcd41m05f7j6MjRy0WwXZeBhCjxMP29dP1GZlOzdi/lnL7MAOvjvCU1dow== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1745391035; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=WwJdSQU9Mp7gY25s96zSaz0i/71ZPlHWpcJ0xxxuTBQ=; b=NPv2p/bbNtdIelmRcwWLJwiLWqrNZgN26xAuDaXizLnq6ceCVtkRUiVzCiyPzPBF9Fz8AH on0EjsqICm6rmBCg== To: Steven Rostedt , Gabriele Monaco , linux-trace-kernel@vger.kernel.org, linux-kernel@vger.kernel.org Cc: john.ogness@linutronix.de, Nam Cao Subject: [PATCH v4 10/22] Documentation/rv: Prepare monitor synthesis document for LTL inclusion Date: Wed, 23 Apr 2025 08:50:05 +0200 Message-Id: <4621f3f54629b168648def14bb9229e51f7942cd.1745390829.git.namcao@linutronix.de> In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Monitor synthesis from deterministic automaton and linear temporal logic have a lot in common. Therefore a single document should describe both. Change da_monitor_synthesis.rst to monitor_synthesis.rst. LTL monitor synthesis will be added to this file by a follow-up commit. This makes the diff far easier to read. If renaming and adding LTL info is done in a single commit, git wouldn't recognize it as a rename, but a file removal and a file addition. While at it, correct the old dot2k commands to the new rvgen commands. Reviewed-by: Gabriele Monaco Signed-off-by: Nam Cao --- Documentation/trace/rv/index.rst | 2 +- ...or_synthesis.rst =3D> monitor_synthesis.rst} | 20 +++++++++---------- 2 files changed, 11 insertions(+), 11 deletions(-) rename Documentation/trace/rv/{da_monitor_synthesis.rst =3D> monitor_synth= esis.rst} (92%) diff --git a/Documentation/trace/rv/index.rst b/Documentation/trace/rv/inde= x.rst index e80e0057feb4..8e411b76ec82 100644 --- a/Documentation/trace/rv/index.rst +++ b/Documentation/trace/rv/index.rst @@ -8,7 +8,7 @@ Runtime Verification =20 runtime-verification.rst deterministic_automata.rst - da_monitor_synthesis.rst + monitor_synthesis.rst da_monitor_instrumentation.rst monitor_wip.rst monitor_wwnr.rst diff --git a/Documentation/trace/rv/da_monitor_synthesis.rst b/Documentatio= n/trace/rv/monitor_synthesis.rst similarity index 92% rename from Documentation/trace/rv/da_monitor_synthesis.rst rename to Documentation/trace/rv/monitor_synthesis.rst index 0a92729c8a9b..85624062073b 100644 --- a/Documentation/trace/rv/da_monitor_synthesis.rst +++ b/Documentation/trace/rv/monitor_synthesis.rst @@ -1,5 +1,5 @@ -Deterministic Automata Monitor Synthesis -=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D +Runtime Verification Monitor Synthesis +=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =20 The starting point for the application of runtime verification (RV) techni= ques is the *specification* or *modeling* of the desired (or undesired) behavior @@ -36,24 +36,24 @@ below:: | +----> panic ? +-------> =20 -DA monitor synthesis +RV monitor synthesis -------------------- =20 The synthesis of automata-based models into the Linux *RV monitor* abstrac= tion -is automated by the dot2k tool and the rv/da_monitor.h header file that +is automated by the rvgen tool and the rv/da_monitor.h header file that contains a set of macros that automatically generate the monitor's code. =20 -dot2k +rvgen ----- =20 -The dot2k utility leverages dot2c by converting an automaton model in +The rvgen utility leverages dot2c by converting an automaton model in the DOT format into the C representation [1] and creating the skeleton of a kernel monitor in C. =20 For example, it is possible to transform the wip.dot model present in [1] into a per-cpu monitor with the following command:: =20 - $ dot2k -d wip.dot -t per_cpu + $ rvgen monitor -c da -s wip.dot -t per_cpu =20 This will create a directory named wip/ with the following files: =20 @@ -87,7 +87,7 @@ the second for monitors with per-cpu instances, and the t= hird with per-task instances. =20 In all cases, the 'name' argument is a string that identifies the monitor,= and -the 'type' argument is the data type used by dot2k on the representation of +the 'type' argument is the data type used by rvgen on the representation of the model in C. =20 For example, the wip model with two states and three events can be @@ -134,7 +134,7 @@ Final remarks ------------- =20 With the monitor synthesis in place using the rv/da_monitor.h and -dot2k, the developer's work should be limited to the instrumentation +rvgen, the developer's work should be limited to the instrumentation of the system, increasing the confidence in the overall approach. =20 [1] For details about deterministic automata format and the translation @@ -142,6 +142,6 @@ from one representation to another, see:: =20 Documentation/trace/rv/deterministic_automata.rst =20 -[2] dot2k appends the monitor's name suffix to the events enums to +[2] rvgen appends the monitor's name suffix to the events enums to avoid conflicting variables when exporting the global vmlinux.h use by BPF programs. --=20 2.39.5 From nobody Thu Dec 18 04:57:59 2025 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D818F267B89; 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dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=EzqvwbQK; arc=none smtp.client-ip=193.142.43.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="XrbNrPla"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="EzqvwbQK" From: Nam Cao DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1745391035; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=NaFew1jGaEi6CxbD4hayUOm9FNrReyDgE4abUKZ5NBI=; b=XrbNrPlaNddym3g2hABeXlEQVwgCccnU6d84srfJT1gxoR37K+hztfgaHU76RpwCAUlTCj RgCCTUdL95oVInWOmq2QY/RRcGsbLSgHyg+/kWxz/7dtG2d9jIF35pg6FR1ESBm0cw5k0F BnJAvvjOkjri7tT5MsUe9amS8DQclTbLc2jDn3fbeVrfxWQMa6lzfBT8RWXlNmBKyqsk7R MPfj+4m4bU4O4EXwnSXDMpfOJ9tij29g0CdeTHLAM2TxR3urtypBntf/KOQj0iQ81D5R1z FnAAUYWw9HdVlZPG+Wy2LbZSg1pDa3KIcSm0eyRLuaUpoFgdx0OICW1pN+SQwQ== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1745391035; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=NaFew1jGaEi6CxbD4hayUOm9FNrReyDgE4abUKZ5NBI=; b=EzqvwbQKhUDYHGFRW/fWkkSKYVhZwpzGg785ZZWlO2qtCOmskoskBeU2tH5HkTrxUljPyg nwgcYsktZB4aHwCQ== To: Steven Rostedt , Gabriele Monaco , linux-trace-kernel@vger.kernel.org, linux-kernel@vger.kernel.org Cc: john.ogness@linutronix.de, Nam Cao Subject: [PATCH v4 11/22] verification/rvgen: Restructure the templates files Date: Wed, 23 Apr 2025 08:50:06 +0200 Message-Id: <31dee13cdb576607c9d63f11dee3b4c3a5553ae8.1745390829.git.namcao@linutronix.de> In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" To simply the scripts and to allow easy integration of new monitor types, restructure the template files as followed: 1. Move the template files to be in the same directory as the rvgen package. Furthermore, the installation will now only install the templates to the package directory, not /usr/share/. This simplify templates reading, as the scripts do not need to find the templates at multiple places. 2. Move dot2k_templates/* to: - templates/dot2k/ - templates/container/ This allows sharing templates reading code between DA monitor generation and container generation (and any future generation type). For template files which can be shared between different generation types, support putting them in templates/ This restructure aligns with the recommendation from: https://python-packaging.readthedocs.io/en/latest/non-code-files.html Reviewed-by: Gabriele Monaco Signed-off-by: Nam Cao --- tools/verification/rvgen/Makefile | 5 +- tools/verification/rvgen/rvgen/dot2k.py | 47 ++++++++----------- .../templates}/Kconfig | 0 .../templates/container/Kconfig} | 0 .../templates/container/main.c} | 0 .../templates/container/main.h} | 0 .../templates/dot2k}/main.c | 0 .../templates/dot2k}/trace.h | 0 8 files changed, 20 insertions(+), 32 deletions(-) rename tools/verification/rvgen/{dot2k_templates =3D> rvgen/templates}/Kco= nfig (100%) rename tools/verification/rvgen/{dot2k_templates/Kconfig_container =3D> rv= gen/templates/container/Kconfig} (100%) rename tools/verification/rvgen/{dot2k_templates/main_container.c =3D> rvg= en/templates/container/main.c} (100%) rename tools/verification/rvgen/{dot2k_templates/main_container.h =3D> rvg= en/templates/container/main.h} (100%) rename tools/verification/rvgen/{dot2k_templates =3D> rvgen/templates/dot2= k}/main.c (100%) rename tools/verification/rvgen/{dot2k_templates =3D> rvgen/templates/dot2= k}/trace.h (100%) diff --git a/tools/verification/rvgen/Makefile b/tools/verification/rvgen/M= akefile index cea9c21c3bce..8d08825e7e54 100644 --- a/tools/verification/rvgen/Makefile +++ b/tools/verification/rvgen/Makefile @@ -3,7 +3,6 @@ INSTALL=3Dinstall prefix ?=3D /usr bindir ?=3D $(prefix)/bin mandir ?=3D $(prefix)/share/man -miscdir ?=3D $(prefix)/share/rvgen srcdir ?=3D $(prefix)/src =20 PYLIB ?=3D $(shell python3 -c 'import sysconfig; print (sysconfig.get_pa= th("purelib"))') @@ -21,6 +20,4 @@ install: $(INSTALL) dot2c -D -m 755 $(DESTDIR)$(bindir)/ $(INSTALL) rvgen/dot2k.py -D -m 644 $(DESTDIR)$(PYLIB)/rvgen/dot2k.py $(INSTALL) __main__.py -D -m 755 $(DESTDIR)$(bindir)/rvgen - - mkdir -p ${miscdir}/ - cp -rp dot2k_templates $(DESTDIR)$(miscdir)/ + cp -rp rvgen/templates $(DESTDIR)$(PYLIB)/rvgen/ diff --git a/tools/verification/rvgen/rvgen/dot2k.py b/tools/verification/r= vgen/rvgen/dot2k.py index e29462413194..a9ed97d0b224 100644 --- a/tools/verification/rvgen/rvgen/dot2k.py +++ b/tools/verification/rvgen/rvgen/dot2k.py @@ -14,14 +14,16 @@ import os =20 class dot2k(Dot2c): monitor_types =3D { "global" : 1, "per_cpu" : 2, "per_task" : 3 } - monitor_templates_dir =3D "rvgen/dot2k_templates/" rv_dir =3D "kernel/trace/rv" monitor_type =3D "per_cpu" =20 def __init__(self, file_path, MonitorType, extra_params=3D{}): self.container =3D extra_params.get("subcmd") =3D=3D "container" self.parent =3D extra_params.get("parent") - self.__fill_rv_templates_dir() + if self.container: + self.abs_template_dir =3D os.path.join(os.path.dirname(__file_= _), "templates/container") + else: + self.abs_template_dir =3D os.path.join(os.path.dirname(__file_= _), "templates/dot2k") =20 if self.container: if file_path: @@ -33,9 +35,7 @@ class dot2k(Dot2c): self.name =3D extra_params.get("model_name") self.events =3D [] self.states =3D [] - self.main_c =3D self.__read_file(self.monitor_templates_dir + = "main_container.c") - self.main_h =3D self.__read_file(self.monitor_templates_dir + = "main_container.h") - self.kconfig =3D self.__read_file(self.monitor_templates_dir += "Kconfig_container") + self.main_h =3D self._read_template_file("main.h") else: super().__init__(file_path, extra_params.get("model_name")) =20 @@ -43,35 +43,16 @@ class dot2k(Dot2c): if self.monitor_type is None: raise ValueError("Unknown monitor type: %s" % MonitorType) self.monitor_type =3D MonitorType - self.main_c =3D self.__read_file(self.monitor_templates_dir + = "main.c") - self.trace_h =3D self.__read_file(self.monitor_templates_dir += "trace.h") - self.kconfig =3D self.__read_file(self.monitor_templates_dir += "Kconfig") + self.trace_h =3D self._read_template_file("trace.h") + + self.main_c =3D self._read_template_file("main.c") + self.kconfig =3D self._read_template_file("Kconfig") self.enum_suffix =3D "_%s" % self.name self.description =3D extra_params.get("description", self.name) or= "auto-generated" self.auto_patch =3D extra_params.get("auto_patch") if self.auto_patch: self.__fill_rv_kernel_dir() =20 - def __fill_rv_templates_dir(self): - - if os.path.exists(self.monitor_templates_dir): - return - - if platform.system() !=3D "Linux": - raise OSError("I can only run on Linux.") - - kernel_path =3D "/lib/modules/%s/build/tools/verification/rvgen/do= t2k_templates/" % (platform.release()) - - if os.path.exists(kernel_path): - self.monitor_templates_dir =3D kernel_path - return - - if os.path.exists("/usr/share/rvgen/dot2k_templates/"): - self.monitor_templates_dir =3D "/usr/share/rvgen/dot2k_templat= es/" - return - - raise FileNotFoundError("Could not find the template directory, do= you have the kernel source installed?") - def __fill_rv_kernel_dir(self): =20 # first try if we are running in the kernel tree root @@ -109,6 +90,16 @@ class dot2k(Dot2c): fd.close() return content =20 + def _read_template_file(self, file): + try: + path =3D os.path.join(self.abs_template_dir, file) + return self.__read_file(path) + except Exception: + # Specific template file not found. Try the generic template f= ile in the template/ + # directory, which is one level up + path =3D os.path.join(self.abs_template_dir, "..", file) + return self.__read_file(path) + def fill_monitor_type(self): return self.monitor_type.upper() =20 diff --git a/tools/verification/rvgen/dot2k_templates/Kconfig b/tools/verif= ication/rvgen/rvgen/templates/Kconfig similarity index 100% rename from tools/verification/rvgen/dot2k_templates/Kconfig rename to tools/verification/rvgen/rvgen/templates/Kconfig diff --git a/tools/verification/rvgen/dot2k_templates/Kconfig_container b/t= ools/verification/rvgen/rvgen/templates/container/Kconfig similarity index 100% rename from tools/verification/rvgen/dot2k_templates/Kconfig_container rename to tools/verification/rvgen/rvgen/templates/container/Kconfig diff --git a/tools/verification/rvgen/dot2k_templates/main_container.c b/to= ols/verification/rvgen/rvgen/templates/container/main.c similarity index 100% rename from tools/verification/rvgen/dot2k_templates/main_container.c rename to tools/verification/rvgen/rvgen/templates/container/main.c diff --git a/tools/verification/rvgen/dot2k_templates/main_container.h b/to= ols/verification/rvgen/rvgen/templates/container/main.h similarity index 100% rename from tools/verification/rvgen/dot2k_templates/main_container.h rename to tools/verification/rvgen/rvgen/templates/container/main.h diff --git a/tools/verification/rvgen/dot2k_templates/main.c b/tools/verifi= cation/rvgen/rvgen/templates/dot2k/main.c similarity index 100% rename from tools/verification/rvgen/dot2k_templates/main.c rename to tools/verification/rvgen/rvgen/templates/dot2k/main.c diff --git a/tools/verification/rvgen/dot2k_templates/trace.h b/tools/verif= ication/rvgen/rvgen/templates/dot2k/trace.h similarity index 100% rename from tools/verification/rvgen/dot2k_templates/trace.h rename to tools/verification/rvgen/rvgen/templates/dot2k/trace.h --=20 2.39.5 From nobody Thu Dec 18 04:57:59 2025 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D860E267B8D; 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a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1745391036; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=J+RNWYu1SgSahorf/z3esUDvCmO80tzytOTkrZJG51I=; b=VLLLqnULzXaXn7iloEkdChrhhweqMbOiDYmsm/R+G8uFww8W8i/AXm7J9A4H9PagTY9FQr UnhlAK6GUEXH/bBg== To: Steven Rostedt , Gabriele Monaco , linux-trace-kernel@vger.kernel.org, linux-kernel@vger.kernel.org Cc: john.ogness@linutronix.de, Nam Cao Subject: [PATCH v4 12/22] verification/rvgen: Restructure the classes to prepare for LTL inclusion Date: Wed, 23 Apr 2025 08:50:07 +0200 Message-Id: <839f92793a4d6f5cd17ce97f5f0290d9aa145729.1745390829.git.namcao@linutronix.de> In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Both container generation and DA monitor generation is implemented in the class dot2k. That requires some ugly "if is_container ... else ...". If linear temporal logic support is added at the current state, the "if else" chain is longer and uglier. Furthermore, container generation is irrevelant to .dot files. It is therefore illogical to be implemented in class "dot2k". Clean it up, restructure the dot2k class into the following class hierarchy: (RVGenerator) /\ / \ / \ / \ / \ (Container) (Monitor) /\ / \ / \ / \ (dot2k) [ltl2k] <- intended This allows a simple and clean integration of LTL. Reviewed-by: Gabriele Monaco Signed-off-by: Nam Cao --- tools/verification/rvgen/Makefile | 2 + tools/verification/rvgen/__main__.py | 6 +- tools/verification/rvgen/rvgen/container.py | 22 ++ tools/verification/rvgen/rvgen/dot2k.py | 275 ++------------------ tools/verification/rvgen/rvgen/generator.py | 264 +++++++++++++++++++ 5 files changed, 308 insertions(+), 261 deletions(-) create mode 100644 tools/verification/rvgen/rvgen/container.py create mode 100644 tools/verification/rvgen/rvgen/generator.py diff --git a/tools/verification/rvgen/Makefile b/tools/verification/rvgen/M= akefile index 8d08825e7e54..cca8c9ba82e8 100644 --- a/tools/verification/rvgen/Makefile +++ b/tools/verification/rvgen/Makefile @@ -19,5 +19,7 @@ install: $(INSTALL) rvgen/dot2c.py -D -m 644 $(DESTDIR)$(PYLIB)/rvgen/dot2c.py $(INSTALL) dot2c -D -m 755 $(DESTDIR)$(bindir)/ $(INSTALL) rvgen/dot2k.py -D -m 644 $(DESTDIR)$(PYLIB)/rvgen/dot2k.py + $(INSTALL) rvgen/container.py -D -m 644 $(DESTDIR)$(PYLIB)/rvgen/containe= r.py + $(INSTALL) rvgen/generator.py -D -m 644 $(DESTDIR)$(PYLIB)/rvgen/generato= r.py $(INSTALL) __main__.py -D -m 755 $(DESTDIR)$(bindir)/rvgen cp -rp rvgen/templates $(DESTDIR)$(PYLIB)/rvgen/ diff --git a/tools/verification/rvgen/__main__.py b/tools/verification/rvge= n/__main__.py index 994d320ad2d1..63ecf0c37034 100644 --- a/tools/verification/rvgen/__main__.py +++ b/tools/verification/rvgen/__main__.py @@ -10,6 +10,8 @@ =20 if __name__ =3D=3D '__main__': from rvgen.dot2k import dot2k + from rvgen.generator import Monitor + from rvgen.container import Container import argparse import sys =20 @@ -29,7 +31,7 @@ if __name__ =3D=3D '__main__': help=3D"Monitor class, either \"da\" or \"= ltl\"") monitor_parser.add_argument('-s', "--spec", dest=3D"spec", help=3D"Mon= itor specification file") monitor_parser.add_argument('-t', "--monitor_type", dest=3D"monitor_ty= pe", - help=3Df"Available options: {', '.join(dot= 2k.monitor_types.keys())}") + help=3Df"Available options: {', '.join(Mon= itor.monitor_types.keys())}") =20 container_parser =3D subparsers.add_parser("container") container_parser.add_argument('-n', "--model_name", dest=3D"model_name= ", required=3DTrue) @@ -47,7 +49,7 @@ if __name__ =3D=3D '__main__': print("Unknown monitor class:", params.monitor_class) sys.exit(1) else: - monitor =3D dot2k(None, None, vars(params)) + monitor =3D Container(vars(params)) except Exception as e: print('Error: '+ str(e)) print("Sorry : :-(") diff --git a/tools/verification/rvgen/rvgen/container.py b/tools/verificati= on/rvgen/rvgen/container.py new file mode 100644 index 000000000000..47d8ab2ad3ec --- /dev/null +++ b/tools/verification/rvgen/rvgen/container.py @@ -0,0 +1,22 @@ +#!/usr/bin/env python3 +# SPDX-License-Identifier: GPL-2.0-only +# +# Copyright (C) 2019-2022 Red Hat, Inc. Daniel Bristot de Oliveira +# +# Generator for runtime verification monitor container + +from . import generator + + +class Container(generator.RVGenerator): + template_dir =3D "container" + + def __init__(self, extra_params=3D{}): + super().__init__(extra_params) + self.name =3D extra_params.get("model_name") + self.main_h =3D self._read_template_file("main.h") + + def fill_model_h(self): + main_h =3D self.main_h + main_h =3D main_h.replace("%%MODEL_NAME%%", self.name) + return main_h diff --git a/tools/verification/rvgen/rvgen/dot2k.py b/tools/verification/r= vgen/rvgen/dot2k.py index a9ed97d0b224..ed0a3c901106 100644 --- a/tools/verification/rvgen/rvgen/dot2k.py +++ b/tools/verification/rvgen/rvgen/dot2k.py @@ -9,108 +9,21 @@ # Documentation/trace/rv/da_monitor_synthesis.rst =20 from .dot2c import Dot2c -import platform -import os +from .generator import Monitor =20 -class dot2k(Dot2c): - monitor_types =3D { "global" : 1, "per_cpu" : 2, "per_task" : 3 } - rv_dir =3D "kernel/trace/rv" - monitor_type =3D "per_cpu" =20 - def __init__(self, file_path, MonitorType, extra_params=3D{}): - self.container =3D extra_params.get("subcmd") =3D=3D "container" - self.parent =3D extra_params.get("parent") - if self.container: - self.abs_template_dir =3D os.path.join(os.path.dirname(__file_= _), "templates/container") - else: - self.abs_template_dir =3D os.path.join(os.path.dirname(__file_= _), "templates/dot2k") - - if self.container: - if file_path: - raise ValueError("A container does not require a dot file") - if MonitorType: - raise ValueError("A container does not require a monitor t= ype") - if self.parent: - raise ValueError("A container cannot have a parent") - self.name =3D extra_params.get("model_name") - self.events =3D [] - self.states =3D [] - self.main_h =3D self._read_template_file("main.h") - else: - super().__init__(file_path, extra_params.get("model_name")) +class dot2k(Monitor, Dot2c): + template_dir =3D "dot2k" =20 - self.monitor_type =3D self.monitor_types.get(MonitorType) - if self.monitor_type is None: - raise ValueError("Unknown monitor type: %s" % MonitorType) - self.monitor_type =3D MonitorType - self.trace_h =3D self._read_template_file("trace.h") - - self.main_c =3D self._read_template_file("main.c") - self.kconfig =3D self._read_template_file("Kconfig") + def __init__(self, file_path, MonitorType, extra_params=3D{}): + self.monitor_type =3D MonitorType + Monitor.__init__(self, extra_params) + Dot2c.__init__(self, file_path, extra_params.get("model_name")) self.enum_suffix =3D "_%s" % self.name - self.description =3D extra_params.get("description", self.name) or= "auto-generated" - self.auto_patch =3D extra_params.get("auto_patch") - if self.auto_patch: - self.__fill_rv_kernel_dir() - - def __fill_rv_kernel_dir(self): - - # first try if we are running in the kernel tree root - if os.path.exists(self.rv_dir): - return - - # offset if we are running inside the kernel tree from verificatio= n/dot2 - kernel_path =3D os.path.join("../..", self.rv_dir) - - if os.path.exists(kernel_path): - self.rv_dir =3D kernel_path - return - - if platform.system() !=3D "Linux": - raise OSError("I can only run on Linux.") - - kernel_path =3D os.path.join("/lib/modules/%s/build" % platform.re= lease(), self.rv_dir) - - # if the current kernel is from a distro this may not be a full ke= rnel tree - # verify that one of the files we are going to modify is available - if os.path.exists(os.path.join(kernel_path, "rv_trace.h")): - self.rv_dir =3D kernel_path - return - - raise FileNotFoundError("Could not find the rv directory, do you h= ave the kernel source installed?") - - def __read_file(self, path): - try: - fd =3D open(path, 'r') - except OSError: - raise Exception("Cannot open the file: %s" % path) - - content =3D fd.read() - - fd.close() - return content - - def _read_template_file(self, file): - try: - path =3D os.path.join(self.abs_template_dir, file) - return self.__read_file(path) - except Exception: - # Specific template file not found. Try the generic template f= ile in the template/ - # directory, which is one level up - path =3D os.path.join(self.abs_template_dir, "..", file) - return self.__read_file(path) =20 def fill_monitor_type(self): return self.monitor_type.upper() =20 - def fill_parent(self): - return "&rv_%s" % self.parent if self.parent else "NULL" - - def fill_include_parent(self): - if self.parent: - return "#include \n" % (self.parent, self.pa= rent) - return "" - def fill_tracepoint_handlers_skel(self): buff =3D [] for event in self.events: @@ -144,30 +57,6 @@ class dot2k(Dot2c): buff.append("\trv_detach_trace_probe(\"%s\", /* XXX: tracepoin= t */, handle_%s);" % (self.name, event)) return '\n'.join(buff) =20 - def fill_main_c(self): - main_c =3D self.main_c - monitor_type =3D self.fill_monitor_type() - min_type =3D self.get_minimun_type() - nr_events =3D len(self.events) - tracepoint_handlers =3D self.fill_tracepoint_handlers_skel() - tracepoint_attach =3D self.fill_tracepoint_attach_probe() - tracepoint_detach =3D self.fill_tracepoint_detach_helper() - parent =3D self.fill_parent() - parent_include =3D self.fill_include_parent() - - main_c =3D main_c.replace("%%MONITOR_TYPE%%", monitor_type) - main_c =3D main_c.replace("%%MIN_TYPE%%", min_type) - main_c =3D main_c.replace("%%MODEL_NAME%%", self.name) - main_c =3D main_c.replace("%%NR_EVENTS%%", str(nr_events)) - main_c =3D main_c.replace("%%TRACEPOINT_HANDLERS_SKEL%%", tracepoi= nt_handlers) - main_c =3D main_c.replace("%%TRACEPOINT_ATTACH%%", tracepoint_atta= ch) - main_c =3D main_c.replace("%%TRACEPOINT_DETACH%%", tracepoint_deta= ch) - main_c =3D main_c.replace("%%DESCRIPTION%%", self.description) - main_c =3D main_c.replace("%%PARENT%%", parent) - main_c =3D main_c.replace("%%INCLUDE_PARENT%%", parent_include) - - return main_c - def fill_model_h_header(self): buff =3D [] buff.append("/* SPDX-License-Identifier: GPL-2.0 */") @@ -226,147 +115,15 @@ class dot2k(Dot2c): buff.append(" TP_ARGS(%s)" % tp_args_c) return '\n'.join(buff) =20 - def fill_monitor_deps(self): - buff =3D [] - buff.append(" # XXX: add dependencies if there") - if self.parent: - buff.append(" depends on RV_MON_%s" % self.parent.upper()) - buff.append(" default y") - return '\n'.join(buff) - - def fill_trace_h(self): - trace_h =3D self.trace_h - monitor_class =3D self.fill_monitor_class() - monitor_class_type =3D self.fill_monitor_class_type() - tracepoint_args_skel_event =3D self.fill_tracepoint_args_skel("eve= nt") - tracepoint_args_skel_error =3D self.fill_tracepoint_args_skel("err= or") - trace_h =3D trace_h.replace("%%MODEL_NAME%%", self.name) - trace_h =3D trace_h.replace("%%MODEL_NAME_UP%%", self.name.upper()) - trace_h =3D trace_h.replace("%%MONITOR_CLASS%%", monitor_class) - trace_h =3D trace_h.replace("%%MONITOR_CLASS_TYPE%%", monitor_clas= s_type) - trace_h =3D trace_h.replace("%%TRACEPOINT_ARGS_SKEL_EVENT%%", trac= epoint_args_skel_event) - trace_h =3D trace_h.replace("%%TRACEPOINT_ARGS_SKEL_ERROR%%", trac= epoint_args_skel_error) - return trace_h - - def fill_kconfig(self): - kconfig =3D self.kconfig - monitor_class_type =3D self.fill_monitor_class_type() - monitor_deps =3D self.fill_monitor_deps() - kconfig =3D kconfig.replace("%%MODEL_NAME%%", self.name) - kconfig =3D kconfig.replace("%%MODEL_NAME_UP%%", self.name.upper()) - kconfig =3D kconfig.replace("%%MONITOR_CLASS_TYPE%%", monitor_clas= s_type) - kconfig =3D kconfig.replace("%%DESCRIPTION%%", self.description) - kconfig =3D kconfig.replace("%%MONITOR_DEPS%%", monitor_deps) - return kconfig - - def fill_main_container_h(self): - main_h =3D self.main_h - main_h =3D main_h.replace("%%MODEL_NAME%%", self.name) - return main_h - - def __patch_file(self, file, marker, line): - file_to_patch =3D os.path.join(self.rv_dir, file) - content =3D self.__read_file(file_to_patch) - content =3D content.replace(marker, line + "\n" + marker) - self.__write_file(file_to_patch, content) - - def fill_tracepoint_tooltip(self): - monitor_class_type =3D self.fill_monitor_class_type() - if self.auto_patch: - self.__patch_file("rv_trace.h", - "// Add new monitors based on CONFIG_%s here" = % monitor_class_type, - "#include " % (self.na= me, self.name)) - return " - Patching %s/rv_trace.h, double check the result" %= self.rv_dir - - return """ - Edit %s/rv_trace.h: -Add this line where other tracepoints are included and %s is defined: -#include -""" % (self.rv_dir, monitor_class_type, self.name, self.name) - - def fill_kconfig_tooltip(self): - if self.auto_patch: - self.__patch_file("Kconfig", - "# Add new monitors here", - "source \"kernel/trace/rv/monitors/%s/Kconfig\= "" % (self.name)) - return " - Patching %s/Kconfig, double check the result" % se= lf.rv_dir - - return """ - Edit %s/Kconfig: -Add this line where other monitors are included: -source \"kernel/trace/rv/monitors/%s/Kconfig\" -""" % (self.rv_dir, self.name) - - def fill_makefile_tooltip(self): - name =3D self.name - name_up =3D name.upper() - if self.auto_patch: - self.__patch_file("Makefile", - "# Add new monitors here", - "obj-$(CONFIG_RV_MON_%s) +=3D monitors/%s/%s.o= " % (name_up, name, name)) - return " - Patching %s/Makefile, double check the result" % s= elf.rv_dir - - return """ - Edit %s/Makefile: -Add this line where other monitors are included: -obj-$(CONFIG_RV_MON_%s) +=3D monitors/%s/%s.o -""" % (self.rv_dir, name_up, name, name) - - def fill_monitor_tooltip(self): - if self.auto_patch: - return " - Monitor created in %s/monitors/%s" % (self.rv_dir,= self. name) - return " - Move %s/ to the kernel's monitor directory (%s/monitor= s)" % (self.name, self.rv_dir) - - def __create_directory(self): - path =3D self.name - if self.auto_patch: - path =3D os.path.join(self.rv_dir, "monitors", path) - try: - os.mkdir(path) - except FileExistsError: - return - except: - print("Fail creating the output dir: %s" % self.name) - - def __write_file(self, file_name, content): - try: - file =3D open(file_name, 'w') - except: - print("Fail writing to file: %s" % file_name) - - file.write(content) - - file.close() - - def __create_file(self, file_name, content): - path =3D "%s/%s" % (self.name, file_name) - if self.auto_patch: - path =3D os.path.join(self.rv_dir, "monitors", path) - self.__write_file(path, content) - - def __get_main_name(self): - path =3D "%s/%s" % (self.name, "main.c") - if not os.path.exists(path): - return "main.c" - return "__main.c" - - def print_files(self): - main_c =3D self.fill_main_c() - - self.__create_directory() - - path =3D "%s.c" % self.name - self.__create_file(path, main_c) + def fill_main_c(self): + main_c =3D super().fill_main_c() =20 - if self.container: - main_h =3D self.fill_main_container_h() - path =3D "%s.h" % self.name - self.__create_file(path, main_h) - else: - model_h =3D self.fill_model_h() - path =3D "%s.h" % self.name - self.__create_file(path, model_h) + min_type =3D self.get_minimun_type() + nr_events =3D len(self.events) + monitor_type =3D self.fill_monitor_type() =20 - trace_h =3D self.fill_trace_h() - path =3D "%s_trace.h" % self.name - self.__create_file(path, trace_h) + main_c =3D main_c.replace("%%MIN_TYPE%%", min_type) + main_c =3D main_c.replace("%%NR_EVENTS%%", str(nr_events)) + main_c =3D main_c.replace("%%MONITOR_TYPE%%", monitor_type) =20 - kconfig =3D self.fill_kconfig() - self.__create_file("Kconfig", kconfig) + return main_c diff --git a/tools/verification/rvgen/rvgen/generator.py b/tools/verificati= on/rvgen/rvgen/generator.py new file mode 100644 index 000000000000..19d0078a3803 --- /dev/null +++ b/tools/verification/rvgen/rvgen/generator.py @@ -0,0 +1,264 @@ +#!/usr/bin/env python3 +# SPDX-License-Identifier: GPL-2.0-only +# +# Copyright (C) 2019-2022 Red Hat, Inc. Daniel Bristot de Oliveira +# +# Abtract class for generating kernel runtime verification monitors from s= pecification file + +import platform +import os + + +class RVGenerator: + rv_dir =3D "kernel/trace/rv" + + def __init__(self, extra_params=3D{}): + self.name =3D extra_params.get("model_name") + self.parent =3D extra_params.get("parent") + self.abs_template_dir =3D \ + os.path.join(os.path.dirname(__file__), "templates", self.temp= late_dir) + self.main_c =3D self._read_template_file("main.c") + self.kconfig =3D self._read_template_file("Kconfig") + self.description =3D extra_params.get("description", self.name) or= "auto-generated" + self.auto_patch =3D extra_params.get("auto_patch") + if self.auto_patch: + self.__fill_rv_kernel_dir() + + def __fill_rv_kernel_dir(self): + + # first try if we are running in the kernel tree root + if os.path.exists(self.rv_dir): + return + + # offset if we are running inside the kernel tree from verificatio= n/dot2 + kernel_path =3D os.path.join("../..", self.rv_dir) + + if os.path.exists(kernel_path): + self.rv_dir =3D kernel_path + return + + if platform.system() !=3D "Linux": + raise OSError("I can only run on Linux.") + + kernel_path =3D os.path.join("/lib/modules/%s/build" % platform.re= lease(), self.rv_dir) + + # if the current kernel is from a distro this may not be a full ke= rnel tree + # verify that one of the files we are going to modify is available + if os.path.exists(os.path.join(kernel_path, "rv_trace.h")): + self.rv_dir =3D kernel_path + return + + raise FileNotFoundError("Could not find the rv directory, do you h= ave the kernel source installed?") + + def _read_file(self, path): + try: + fd =3D open(path, 'r') + except OSError: + raise Exception("Cannot open the file: %s" % path) + + content =3D fd.read() + + fd.close() + return content + + def _read_template_file(self, file): + try: + path =3D os.path.join(self.abs_template_dir, file) + return self._read_file(path) + except Exception: + # Specific template file not found. Try the generic template f= ile in the template/ + # directory, which is one level up + path =3D os.path.join(self.abs_template_dir, "..", file) + return self._read_file(path) + + def fill_parent(self): + return "&rv_%s" % self.parent if self.parent else "NULL" + + def fill_include_parent(self): + if self.parent: + return "#include \n" % (self.parent, self.pa= rent) + return "" + + def fill_tracepoint_handlers_skel(self): + return "NotImplemented" + + def fill_tracepoint_attach_probe(self): + return "NotImplemented" + + def fill_tracepoint_detach_helper(self): + return "NotImplemented" + + def fill_main_c(self): + main_c =3D self.main_c + tracepoint_handlers =3D self.fill_tracepoint_handlers_skel() + tracepoint_attach =3D self.fill_tracepoint_attach_probe() + tracepoint_detach =3D self.fill_tracepoint_detach_helper() + parent =3D self.fill_parent() + parent_include =3D self.fill_include_parent() + + main_c =3D main_c.replace("%%MODEL_NAME%%", self.name) + main_c =3D main_c.replace("%%TRACEPOINT_HANDLERS_SKEL%%", tracepoi= nt_handlers) + main_c =3D main_c.replace("%%TRACEPOINT_ATTACH%%", tracepoint_atta= ch) + main_c =3D main_c.replace("%%TRACEPOINT_DETACH%%", tracepoint_deta= ch) + main_c =3D main_c.replace("%%DESCRIPTION%%", self.description) + main_c =3D main_c.replace("%%PARENT%%", parent) + main_c =3D main_c.replace("%%INCLUDE_PARENT%%", parent_include) + + return main_c + + def fill_model_h(self): + return "NotImplemented" + + def fill_monitor_class_type(self): + return "NotImplemented" + + def fill_monitor_class(self): + return "NotImplemented" + + def fill_tracepoint_args_skel(self, tp_type): + return "NotImplemented" + + def fill_monitor_deps(self): + buff =3D [] + buff.append(" # XXX: add dependencies if there") + if self.parent: + buff.append(" depends on RV_MON_%s" % self.parent.upper()) + buff.append(" default y") + return '\n'.join(buff) + + def fill_kconfig(self): + kconfig =3D self.kconfig + monitor_class_type =3D self.fill_monitor_class_type() + monitor_deps =3D self.fill_monitor_deps() + kconfig =3D kconfig.replace("%%MODEL_NAME%%", self.name) + kconfig =3D kconfig.replace("%%MODEL_NAME_UP%%", self.name.upper()) + kconfig =3D kconfig.replace("%%MONITOR_CLASS_TYPE%%", monitor_clas= s_type) + kconfig =3D kconfig.replace("%%DESCRIPTION%%", self.description) + kconfig =3D kconfig.replace("%%MONITOR_DEPS%%", monitor_deps) + return kconfig + + def __patch_file(self, file, marker, line): + file_to_patch =3D os.path.join(self.rv_dir, file) + content =3D self._read_file(file_to_patch) + content =3D content.replace(marker, line + "\n" + marker) + self.__write_file(file_to_patch, content) + + def fill_tracepoint_tooltip(self): + monitor_class_type =3D self.fill_monitor_class_type() + if self.auto_patch: + self.__patch_file("rv_trace.h", + "// Add new monitors based on CONFIG_%s here" = % monitor_class_type, + "#include " % (self.na= me, self.name)) + return " - Patching %s/rv_trace.h, double check the result" %= self.rv_dir + + return """ - Edit %s/rv_trace.h: +Add this line where other tracepoints are included and %s is defined: +#include +""" % (self.rv_dir, monitor_class_type, self.name, self.name) + + def fill_kconfig_tooltip(self): + if self.auto_patch: + self.__patch_file("Kconfig", + "# Add new monitors here", + "source \"kernel/trace/rv/monitors/%s/Kconfig\= "" % (self.name)) + return " - Patching %s/Kconfig, double check the result" % se= lf.rv_dir + + return """ - Edit %s/Kconfig: +Add this line where other monitors are included: +source \"kernel/trace/rv/monitors/%s/Kconfig\" +""" % (self.rv_dir, self.name) + + def fill_makefile_tooltip(self): + name =3D self.name + name_up =3D name.upper() + if self.auto_patch: + self.__patch_file("Makefile", + "# Add new monitors here", + "obj-$(CONFIG_RV_MON_%s) +=3D monitors/%s/%s.o= " % (name_up, name, name)) + return " - Patching %s/Makefile, double check the result" % s= elf.rv_dir + + return """ - Edit %s/Makefile: +Add this line where other monitors are included: +obj-$(CONFIG_RV_MON_%s) +=3D monitors/%s/%s.o +""" % (self.rv_dir, name_up, name, name) + + def fill_monitor_tooltip(self): + if self.auto_patch: + return " - Monitor created in %s/monitors/%s" % (self.rv_dir,= self. name) + return " - Move %s/ to the kernel's monitor directory (%s/monitor= s)" % (self.name, self.rv_dir) + + def __create_directory(self): + path =3D self.name + if self.auto_patch: + path =3D os.path.join(self.rv_dir, "monitors", path) + try: + os.mkdir(path) + except FileExistsError: + return + except: + print("Fail creating the output dir: %s" % self.name) + + def __write_file(self, file_name, content): + try: + file =3D open(file_name, 'w') + except: + print("Fail writing to file: %s" % file_name) + + file.write(content) + + file.close() + + def _create_file(self, file_name, content): + path =3D "%s/%s" % (self.name, file_name) + if self.auto_patch: + path =3D os.path.join(self.rv_dir, "monitors", path) + self.__write_file(path, content) + + def __get_main_name(self): + path =3D "%s/%s" % (self.name, "main.c") + if not os.path.exists(path): + return "main.c" + return "__main.c" + + def print_files(self): + main_c =3D self.fill_main_c() + + self.__create_directory() + + path =3D "%s.c" % self.name + self._create_file(path, main_c) + + model_h =3D self.fill_model_h() + path =3D "%s.h" % self.name + self._create_file(path, model_h) + + kconfig =3D self.fill_kconfig() + self._create_file("Kconfig", kconfig) + + +class Monitor(RVGenerator): + monitor_types =3D { "global" : 1, "per_cpu" : 2, "per_task" : 3 } + + def __init__(self, extra_params=3D{}): + super().__init__(extra_params) + self.trace_h =3D self._read_template_file("trace.h") + + def fill_trace_h(self): + trace_h =3D self.trace_h + monitor_class =3D self.fill_monitor_class() + monitor_class_type =3D self.fill_monitor_class_type() + tracepoint_args_skel_event =3D self.fill_tracepoint_args_skel("eve= nt") + tracepoint_args_skel_error =3D self.fill_tracepoint_args_skel("err= or") + trace_h =3D trace_h.replace("%%MODEL_NAME%%", self.name) + trace_h =3D trace_h.replace("%%MODEL_NAME_UP%%", self.name.upper()) + trace_h =3D trace_h.replace("%%MONITOR_CLASS%%", monitor_class) + trace_h =3D trace_h.replace("%%MONITOR_CLASS_TYPE%%", monitor_clas= s_type) + trace_h =3D trace_h.replace("%%TRACEPOINT_ARGS_SKEL_EVENT%%", trac= epoint_args_skel_event) + trace_h =3D trace_h.replace("%%TRACEPOINT_ARGS_SKEL_ERROR%%", trac= epoint_args_skel_error) + return trace_h + + def print_files(self): + super().print_files() + trace_h =3D self.fill_trace_h() + path =3D "%s_trace.h" % self.name + self._create_file(path, trace_h) --=20 2.39.5 From nobody Thu Dec 18 04:57:59 2025 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 01E11267F52; Wed, 23 Apr 2025 06:50:43 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b=J2K1uw+Hj61wL0xmCqbOhKFILkC6oSW3nqY2D8/w7wTozh9I7FmwlGrvwXll4lFTg40TZf bhEQev2XCsoFr/Nm6uek2vuXTlr7PI3U5R2AqcGhGbApr8mOCywIhjmfkUJYnOGfneKvbp sqI/47XX0aN6djjCEAoGPFgpjlewCsPKYJfNhBMLvScDa8FF74mN/dErxPnWV27rSev617 cZJoIeWX6PPS6xzsRvMoptVytnOkglKJ3Mv7S/Gq3grurR49ikG77Yen3yYE1gxD6Jmtkp zuhmOyZZxAU6SiQTHWJTvBDk/Q+Jg/3r0hicaeKLQoBQIAQ+JfsV/0IjmGXiZA== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1745391037; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=6hH1K4xWV3HTIGqU/T5uFigiD+iEZgzZ32tacjeJTIE=; b=nLY7IjiXB8U/8OzMWNcjGRkCetuO/5a8qrlr+gwKov6gCAjyFxXWPI3T7sMLRWPTgasoOo g+UQfO+q6zptU9BQ== To: Steven Rostedt , Gabriele Monaco , linux-trace-kernel@vger.kernel.org, linux-kernel@vger.kernel.org Cc: john.ogness@linutronix.de, Nam Cao Subject: [PATCH v4 13/22] rv: Add support for LTL monitors Date: Wed, 23 Apr 2025 08:50:08 +0200 Message-Id: <9b3542cbca2a2c3434fe9725d31140ab33ddadce.1745390829.git.namcao@linutronix.de> In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" While attempting to implement DA monitors for some complex specifications, deterministic automaton is found to be inappropriate as the specification language. The automaton is complicated, hard to understand, and error-prone. For these cases, linear temporal logic is more suitable as the specification language. Add support for linear temporal logic runtime verification monitor. For all the details, see the documentations added by this commit. Signed-off-by: Nam Cao --- Documentation/trace/rv/index.rst | 1 + .../trace/rv/linear_temporal_logic.rst | 122 ++++ Documentation/trace/rv/monitor_synthesis.rst | 141 ++++- include/linux/rv.h | 62 +- include/rv/ltl_monitor.h | 184 ++++++ kernel/fork.c | 5 +- kernel/trace/rv/Kconfig | 7 + kernel/trace/rv/rv_trace.h | 47 ++ tools/verification/rvgen/.gitignore | 3 + tools/verification/rvgen/Makefile | 2 + tools/verification/rvgen/__main__.py | 3 +- tools/verification/rvgen/rvgen/ltl2ba.py | 558 ++++++++++++++++++ tools/verification/rvgen/rvgen/ltl2k.py | 245 ++++++++ .../rvgen/rvgen/templates/ltl2k/main.c | 102 ++++ .../rvgen/rvgen/templates/ltl2k/trace.h | 14 + 15 files changed, 1471 insertions(+), 25 deletions(-) create mode 100644 Documentation/trace/rv/linear_temporal_logic.rst create mode 100644 include/rv/ltl_monitor.h create mode 100644 tools/verification/rvgen/.gitignore create mode 100644 tools/verification/rvgen/rvgen/ltl2ba.py create mode 100644 tools/verification/rvgen/rvgen/ltl2k.py create mode 100644 tools/verification/rvgen/rvgen/templates/ltl2k/main.c create mode 100644 tools/verification/rvgen/rvgen/templates/ltl2k/trace.h diff --git a/Documentation/trace/rv/index.rst b/Documentation/trace/rv/inde= x.rst index 8e411b76ec82..2a27f6bc9429 100644 --- a/Documentation/trace/rv/index.rst +++ b/Documentation/trace/rv/index.rst @@ -8,6 +8,7 @@ Runtime Verification =20 runtime-verification.rst deterministic_automata.rst + linear_temporal_logic.rst monitor_synthesis.rst da_monitor_instrumentation.rst monitor_wip.rst diff --git a/Documentation/trace/rv/linear_temporal_logic.rst b/Documentati= on/trace/rv/linear_temporal_logic.rst new file mode 100644 index 000000000000..6bf10d8e3761 --- /dev/null +++ b/Documentation/trace/rv/linear_temporal_logic.rst @@ -0,0 +1,122 @@ +Linear temporal logic +=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D + +Introduction +------------ + +Runtime verification monitor is a verification technique which checks that= the kernel follows a +specification. It does so by using tracepoints to monitor the kernel's exe= cution trace, and +verifying that the execution trace sastifies the specification. + +Initially, the specification can only be written in the form of determinis= tic automaton (DA). +However, while attempting to implement DA monitors for some complex specif= ications, deterministic +automaton is found to be inappropriate as the specification language. The = automaton is complicated, +hard to understand, and error-prone. + +Thus, RV monitors based on linear temporal logic (LTL) are introduced. Thi= s type of monitor uses LTL +as specification instead of DA. For some cases, writing the specification = as LTL is more concise and +intuitive. + +Many materials explain LTL in details. One book is:: + + Christel Baier aund Joost-Pieter Katoen: Principles of Model Checking, T= he MIT Press, 2008. + +Grammar +------- + +Unlike some existing syntax, kernel's implementation of LTL is more verbos= e. This is motivated by +considering that the people who read the LTL specifications may not be wel= l-versed in LTL. + +Grammar: + ltl ::=3D opd | ( ltl ) | ltl binop ltl | unop ltl + +Operands (opd): + true, false, user-defined names consisting of upper-case characters, d= igits, and underscore. + +Unary Operators (unop): + always + eventually + not + +Binary Operators (binop): + until + and + or + imply + equivalent + +This grammar is ambiguous: operator precedence is not defined. Parentheses= must be used. + +Example linear temporal logic +----------------------------- +.. code-block:: + + RAIN imply (GO_OUTSIDE imply HAVE_UMBRELLA) + +means: if it is raining, going outside means having an umbrella. + +.. code-block:: + + RAIN imply (WET until not RAIN) + +means: if it is raining, it is going to be wet until the rain stops. + +.. code-block:: + + RAIN imply eventually not RAIN + +means: if it is raining, rain will eventually stop. + +The above examples are referring to the current time instance only. For ke= rnel verification, the +`always` operator is usually desirable, to specify that something is alway= s true at the present and +for all future. For example:: + + always (RAIN imply eventually not RAIN) + +means: *all* rain eventually stops. + +In the above examples, `RAIN`, `GO_OUTSIDE`, `HAVE_UMBRELLA` and `WET` are= the "atomic +propositions". + +Monitor synthesis +----------------- + +To synthesize an LTL into a kernel monitor, the `rvgen` tool can be used: +`tools/verification/rvgen`. The specification needs to be provided as a fi= le, and it must have a +"RULE =3D LTL" assignment. For example:: + + RULE =3D always (ACQUIRE imply ((not KILLED and not CRASHED) until REL= EASE)) + +which says: if `ACQUIRE`, then `RELEASE` must happen before `KILLED` or `C= RASHED`. + +The LTL can be broken down using sub-expressions. The above is equivalent = to: + + .. code-block:: + + RULE =3D always (ACQUIRE imply (ALIVE until RELEASE)) + ALIVE =3D not KILLED and not CRASHED + +From this specification, `rvgen` generates the C implementation of a Buchi= automaton - a +non-deterministic state machine which checks the satisfiability of the LTL= . See +Documentation/trace/rv/monitor_synthesis.rst for details on using `rvgen`. + +References +---------- + +One book covering model checking and linear temporal logic is:: + + Christel Baier aund Joost-Pieter Katoen: Principles of Model Checking, T= he MIT Press, 2008. + +For an example of using linear temporal logic in software testing, see:: + + Ruijie Meng, Zhen Dong, Jialin Li, Ivan Beschastnikh, and Abhik Roychoud= hury. 2022. Linear-time + temporal logic guided greybox fuzzing. In Proceedings of the 44th Intern= ational Conference on + Software Engineering (ICSE '22). Association for Computing Machinery, Ne= w York, NY, USA, + 1343=E2=80=931355. https://doi.org/10.1145/3510003.3510082 + +The kernel's LTL monitor implementation is based on:: + + Gerth, R., Peled, D., Vardi, M.Y., Wolper, P. (1996). Simple On-the-fly = Automatic Verification of + Linear Temporal Logic. In: Dembi=C5=84ski, P., =C5=9Aredniawa, M. (eds) = Protocol Specification, Testing and + Verification XV. PSTV 1995. IFIP Advances in Information and Communicati= on Technology. Springer, + Boston, MA. https://doi.org/10.1007/978-0-387-34892-6_1 diff --git a/Documentation/trace/rv/monitor_synthesis.rst b/Documentation/t= race/rv/monitor_synthesis.rst index 85624062073b..aa532f10c211 100644 --- a/Documentation/trace/rv/monitor_synthesis.rst +++ b/Documentation/trace/rv/monitor_synthesis.rst @@ -39,16 +39,17 @@ below:: RV monitor synthesis -------------------- =20 -The synthesis of automata-based models into the Linux *RV monitor* abstrac= tion -is automated by the rvgen tool and the rv/da_monitor.h header file that -contains a set of macros that automatically generate the monitor's code. +The synthesis of a specification into the Linux *RV monitor* abstraction i= s automated by the rvgen +tool and the header file containing common code for creating monitors. The= header files are: + + * rv/da_monitor.h for deterministic automaton monitor. + * rv/ltl_monitor.h for linear temporal logic monitor. =20 rvgen ----- =20 -The rvgen utility leverages dot2c by converting an automaton model in -the DOT format into the C representation [1] and creating the skeleton of -a kernel monitor in C. +The rvgen utility converts a specification into the C presentation and cre= ating the skeleton of a +kernel monitor in C. =20 For example, it is possible to transform the wip.dot model present in [1] into a per-cpu monitor with the following command:: @@ -63,18 +64,34 @@ This will create a directory named wip/ with the follow= ing files: The wip.c file contains the monitor declaration and the starting point for the system instrumentation. =20 -Monitor macros --------------- +Similarly, a linear temporal logic monitor can be generated with the follo= wing command:: + + $ rvgen monitor -c ltl -s pagefault.ltl -t per_task + +This generates pagefault/ directory with: + +- pagefault.h: The Buchi automaton (the non-deterministic state machine to= verify the specification) +- pagefault.c: The skeleton for the RV monitor + +Monitor header files +-------------------- + +The header files: + +- `rv/da_monitor.h` for deterministic automaton monitor +- `rv/ltl_monitor` for linear temporal logic monitor + +include common macros and static functions for implementing *Monitor Insta= nce(s)*. =20 -The rv/da_monitor.h enables automatic code generation for the *Monitor -Instance(s)* using C macros. +The benefits of having all common functionalities in a single header file = are 3-fold: =20 -The benefits of the usage of macro for monitor synthesis are 3-fold as it: + - Reduce the code duplication; + - Facilitate the bug fix/improvement; + - Avoid the case of developers changing the core of the monitor code to = manipulate the model in a + (let's say) non-standard way. =20 -- Reduces the code duplication; -- Facilitates the bug fix/improvement; -- Avoids the case of developers changing the core of the monitor code - to manipulate the model in a (let's say) non-standard way. +rv/da_monitor.h ++++++++++++++++ =20 This initial implementation presents three different types of monitor inst= ances: =20 @@ -130,10 +147,102 @@ While the event "preempt_enabled" will use:: To notify the monitor that the system will be returning to the initial sta= te, so the system and the monitor should be in sync. =20 +rv/ltl_monitor.h +++++++++++++++++ +This file must be combined with the $(MODEL_NAME).h file (generated by `rv= gen`) to be complete. For +example, for the `pagefault` monitor, the `pagefault.c` source file must i= nclude:: + + #include "pagefault.h" + #include + +(the skeleton monitor file generated by `rvgen` already does this). + +`$(MODEL_NAME).h` (`pagefault.h` in the above example) includes the implem= entation of the Buchi +automaton - a non-deterministic state machine that verifies the LTL specif= ication. While +`rv/ltl_monitor.h` includes the common helper functions to interact with t= he Buchi automaton and to +implement an RV monitor. An important definition in `$(MODEL_NAME).h` is:: + + enum ltl_atom { + LTL_$(FIRST_ATOMIC_PROPOSITION), + LTL_$(SECOND_ATOMIC_PROPOSITION), + ... + LTL_NUM_ATOM + }; + +which is the list of atomic propositions present in the LTL specification = (prefixed with "LTL\_" to +avoid name collision). This `enum` is passed to the functions interacting = with the Buchi automaton. + +While generating code, `rvgen` cannot understand the meaning of the atomic= propositions. Thus, that +task is left for manual work. The recommended pratice is adding tracepoint= s to places where the +atomic propositions change; and in the tracepoints' handlers: the Buchi au= tomaton is executed +using:: + + void ltl_atom_update(struct task_struct *task, enum ltl_atom atom, bool = value) + +which tells the Buchi automaton that the atomic proposition `atom` is now = `value`. The Buchi +automaton checks whether the LTL specification is still satisfied, and inv= okes the monitor's error +tracepoint and the reactor if violation is detected. + +Tracepoints and `ltl_atom_update()` should be used whenever possible. Howe= ver, it is sometimes not +the most convenient. For some atomic propositions which are changed in mul= tiple places in the +kernel, it is cumbersome to trace all those places. Furthermore, it may no= t be important that the +atomic propositions are updated at precise times. For example, considering= the following linear +temporal logic:: + + RULE =3D always (RT imply not PAGEFAULT) + +This LTL states that a real-time task does not raise page faults. For this= specification, it is not +important when `RT` changes, as long as it has the correct value when `PAG= EFAULT` is true. +Motivated by this case, another function is introduced:: + + void ltl_atom_fetch(struct task_struct *task, struct ltl_monitor *mon) + +This function is called whenever the Buchi automaton is triggered. Therefo= re, it can be manually +implemented to "fetch" `RT`:: + + void ltl_atom_fetch(struct task_struct *task, struct ltl_monitor *mon) + { + ltl_atom_set(mon, LTL_RT, rt_task(task)); + } + +Effectively, whenever `PAGEFAULT` is updated with a call to `ltl_atom_upda= te()`, `RT` is also +fetched. Thus, the LTL specification can be verified without tracing `RT` = everywhere. + +For atomic propositions which act like events, they usually need to be set= (or cleared) and then +immediately cleared (or set). A convenient function is provided:: + + void ltl_atom_pulse(struct task_struct *task, enum ltl_atom atom, bool v= alue) + +which is equivalent to:: + + ltl_atom_update(task, atom, value); + ltl_atom_update(task, atom, !value); + +To initialize the atomic propositions, the following function must be impl= emented:: + + ltl_atoms_init(struct task_struct *task, struct ltl_monitor *mon, bool t= ask_creation) + +This function is called for all running tasks when the monitor is enabled.= It is also called for new +tasks created after the enabling the monitor. It should initialize as many= atomic propositions as +possible, for example:: + + void ltl_atom_init(struct task_struct *task, struct ltl_monitor *mon, bo= ol task_creation) + { + ltl_atom_set(mon, LTL_RT, rt_task(task)); + if (task_creation) + ltl_atom_set(mon, LTL_PAGEFAULT, false); + } + +Atomic propositions not initialized by `ltl_atom_init()` will stay in the = unknown state until +relevant tracepoints are hit, which can take some time. As monitoring for = a task cannot be done +until all atomic propositions is known for the task, the monitor may need = some time to start +validating tasks which have been running before the monitor is enabled. Th= erefore, it is recommended +to start the tasks of interest after enabling the monitor. + Final remarks ------------- =20 -With the monitor synthesis in place using the rv/da_monitor.h and +With the monitor synthesis in place using the header files and rvgen, the developer's work should be limited to the instrumentation of the system, increasing the confidence in the overall approach. =20 diff --git a/include/linux/rv.h b/include/linux/rv.h index 9428e62eb8e9..2897aad16883 100644 --- a/include/linux/rv.h +++ b/include/linux/rv.h @@ -10,6 +10,10 @@ #define MAX_DA_NAME_LEN 32 =20 #ifdef CONFIG_RV +#include +#include +#include + /* * Deterministic automaton per-object variables. */ @@ -18,6 +22,58 @@ struct da_monitor { unsigned int curr_state; }; =20 +#ifdef CONFIG_RV_LTL_MONITOR + +/* + * In the future, if the number of atomic propositions or the size of Buch= i automaton is larger, we + * can switch to dynamic allocation. For now, the code is simpler this way. + */ +#define RV_MAX_LTL_ATOM 32 +#define RV_MAX_BA_STATES 32 + +/** + * struct ltl_monitor - A linear temporal logic runtime verification monit= or + * @states: States in the Buchi automaton. As Buchi automaton is a + * non-deterministic state machine, the monitor can be in multiple states + * simultaneously. This is a bitmask of all possible states. + * If this is zero, that means either: + * - The monitor has not started yet (e.g. because not all atomic pro= positions are + * known). + * - there is no possible state to be in. In other words, a violation= of the + * LTL property is detected. + * @atoms: The values of atomic propositions. + * @unknown_atoms: Atomic propositions which are still unknown. + */ +struct ltl_monitor { + DECLARE_BITMAP(states, RV_MAX_BA_STATES); + DECLARE_BITMAP(atoms, RV_MAX_LTL_ATOM); + DECLARE_BITMAP(unknown_atoms, RV_MAX_LTL_ATOM); +}; + +static inline bool rv_ltl_valid_state(struct ltl_monitor *mon) +{ + for (int i =3D 0; i < ARRAY_SIZE(mon->states); ++i) { + if (mon->states[i]) + return true; + } + return false; +} + +static inline bool rv_ltl_all_atoms_known(struct ltl_monitor *mon) +{ + for (int i =3D 0; i < ARRAY_SIZE(mon->unknown_atoms); ++i) { + if (mon->unknown_atoms[i]) + return false; + } + return true; +} + +#else + +struct ltl_monitor {}; + +#endif /* CONFIG_RV_LTL_MONITOR */ + /* * Per-task RV monitors count. Nowadays fixed in RV_PER_TASK_MONITORS. * If we find justification for more monitors, we can think about @@ -27,11 +83,9 @@ struct da_monitor { #define RV_PER_TASK_MONITORS 1 #define RV_PER_TASK_MONITOR_INIT (RV_PER_TASK_MONITORS) =20 -/* - * Futher monitor types are expected, so make this a union. - */ union rv_task_monitor { - struct da_monitor da_mon; + struct da_monitor da_mon; + struct ltl_monitor ltl_mon; }; =20 #ifdef CONFIG_RV_REACTORS diff --git a/include/rv/ltl_monitor.h b/include/rv/ltl_monitor.h new file mode 100644 index 000000000000..78f5a1197665 --- /dev/null +++ b/include/rv/ltl_monitor.h @@ -0,0 +1,184 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/** + * This file must be combined with the $(MODEL_NAME).h file generated by + * tools/verification/rvgen. + */ + +#include +#include +#include +#include +#include +#include +#include + +#ifndef MONITOR_NAME +#error "MONITOR_NAME macro is not defined. Did you include $(MODEL_NAME).h= generated by rvgen?" +#endif + +#ifdef CONFIG_RV_REACTORS +#define RV_MONITOR_NAME CONCATENATE(rv_, MONITOR_NAME) +static struct rv_monitor RV_MONITOR_NAME; + +static void rv_cond_react(struct task_struct *task) +{ + if (!rv_reacting_on() || !RV_MONITOR_NAME.react) + return; + RV_MONITOR_NAME.react("rv: "__stringify(MONITOR_NAME)": %s[%d]: violation= detected\n", + task->comm, task->pid); +} +#else +static void rv_cond_react(struct task_struct *task) +{ +} +#endif + +static int ltl_monitor_slot =3D RV_PER_TASK_MONITOR_INIT; + +static void ltl_atoms_fetch(struct task_struct *task, struct ltl_monitor *= mon); +static void ltl_atoms_init(struct task_struct *task, struct ltl_monitor *m= on, bool task_creation); + +static struct ltl_monitor *ltl_get_monitor(struct task_struct *task) +{ + return &task->rv[ltl_monitor_slot].ltl_mon; +} + +static void ltl_task_init(struct task_struct *task, bool task_creation) +{ + struct ltl_monitor *mon =3D ltl_get_monitor(task); + + memset(&mon->states, 0, sizeof(mon->states)); + + for (int i =3D 0; i < LTL_NUM_ATOM; ++i) + __set_bit(i, mon->unknown_atoms); + + ltl_atoms_init(task, mon, task_creation); + ltl_atoms_fetch(task, mon); +} + +static void handle_task_newtask(void *data, struct task_struct *task, unsi= gned long flags) +{ + ltl_task_init(task, true); +} + +static int ltl_monitor_init(void) +{ + struct task_struct *g, *p; + int ret, cpu; + + ret =3D rv_get_task_monitor_slot(); + if (ret < 0) + return ret; + + ltl_monitor_slot =3D ret; + + rv_attach_trace_probe(name, task_newtask, handle_task_newtask); + + read_lock(&tasklist_lock); + + for_each_process_thread(g, p) + ltl_task_init(p, false); + + for_each_present_cpu(cpu) + ltl_task_init(idle_task(cpu), false); + + read_unlock(&tasklist_lock); + + return 0; +} + +static void ltl_monitor_destroy(void) +{ + rv_detach_trace_probe(name, task_newtask, handle_task_newtask); + + rv_put_task_monitor_slot(ltl_monitor_slot); + ltl_monitor_slot =3D RV_PER_TASK_MONITOR_INIT; +} + +static void ltl_illegal_state(struct task_struct *task, struct ltl_monitor= *mon) +{ + CONCATENATE(trace_error_, MONITOR_NAME)(task); + rv_cond_react(task); +} + +static void ltl_attempt_start(struct task_struct *task, struct ltl_monitor= *mon) +{ + if (rv_ltl_all_atoms_known(mon)) + ltl_start(task, mon); +} + +static inline void ltl_atom_set(struct ltl_monitor *mon, enum ltl_atom ato= m, bool value) +{ + __clear_bit(atom, mon->unknown_atoms); + if (value) + __set_bit(atom, mon->atoms); + else + __clear_bit(atom, mon->atoms); +} + +static void +ltl_trace_event(struct task_struct *task, struct ltl_monitor *mon, unsigne= d long *next_state) +{ + const char *format_str =3D "%s"; + DECLARE_SEQ_BUF(atoms, 64); + char states[32], next[32]; + int i; + + if (!CONCATENATE(CONCATENATE(trace_event_, MONITOR_NAME), _enabled)()) + return; + + snprintf(states, sizeof(states), "%*pbl", RV_MAX_BA_STATES, mon->states); + snprintf(next, sizeof(next), "%*pbl", RV_MAX_BA_STATES, next_state); + + for (i =3D 0; i < LTL_NUM_ATOM; ++i) { + if (test_bit(i, mon->atoms)) { + seq_buf_printf(&atoms, format_str, ltl_atom_str(i)); + format_str =3D ",%s"; + } + } + + CONCATENATE(trace_event_, MONITOR_NAME)(task, states, atoms.buffer, next); +} + +static void ltl_validate(struct task_struct *task, struct ltl_monitor *mon) +{ + DECLARE_BITMAP(next_states, RV_MAX_BA_STATES) =3D {0}; + + if (!rv_ltl_valid_state(mon)) + return; + + for (unsigned int i =3D 0; i < RV_NUM_BA_STATES; ++i) { + if (test_bit(i, mon->states)) + ltl_possible_next_states(mon, i, next_states); + } + + ltl_trace_event(task, mon, next_states); + + memcpy(mon->states, next_states, sizeof(next_states)); + + if (!rv_ltl_valid_state(mon)) + ltl_illegal_state(task, mon); +} + +static void ltl_atom_update(struct task_struct *task, enum ltl_atom atom, = bool value) +{ + struct ltl_monitor *mon =3D ltl_get_monitor(task); + + ltl_atom_set(mon, atom, value); + ltl_atoms_fetch(task, mon); + + if (!rv_ltl_valid_state(mon)) + ltl_attempt_start(task, mon); + + ltl_validate(task, mon); +} + +static void __maybe_unused ltl_atom_pulse(struct task_struct *task, enum l= tl_atom atom, bool value) +{ + struct ltl_monitor *mon =3D ltl_get_monitor(task); + + ltl_atom_update(task, atom, value); + + ltl_atom_set(mon, atom, !value); + ltl_validate(task, mon); +} diff --git a/kernel/fork.c b/kernel/fork.c index 735405a9c5f3..5d6c1caca702 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -2127,10 +2127,7 @@ static void copy_oom_score_adj(u64 clone_flags, stru= ct task_struct *tsk) #ifdef CONFIG_RV static void rv_task_fork(struct task_struct *p) { - int i; - - for (i =3D 0; i < RV_PER_TASK_MONITORS; i++) - p->rv[i].da_mon.monitoring =3D false; + memset(p->rv, 0, sizeof(p->rv)); } #else #define rv_task_fork(p) do {} while (0) diff --git a/kernel/trace/rv/Kconfig b/kernel/trace/rv/Kconfig index 6cdffc04b73c..6e157f964991 100644 --- a/kernel/trace/rv/Kconfig +++ b/kernel/trace/rv/Kconfig @@ -11,6 +11,13 @@ config DA_MON_EVENTS_ID select RV_MON_EVENTS bool =20 +config LTL_MON_EVENTS_ID + select RV_MON_EVENTS + bool + +config RV_LTL_MONITOR + bool + menuconfig RV bool "Runtime Verification" depends on TRACING diff --git a/kernel/trace/rv/rv_trace.h b/kernel/trace/rv/rv_trace.h index 99c3801616d4..f9fb848bae91 100644 --- a/kernel/trace/rv/rv_trace.h +++ b/kernel/trace/rv/rv_trace.h @@ -127,6 +127,53 @@ DECLARE_EVENT_CLASS(error_da_monitor_id, // Add new monitors based on CONFIG_DA_MON_EVENTS_ID here =20 #endif /* CONFIG_DA_MON_EVENTS_ID */ +#if CONFIG_LTL_MON_EVENTS_ID +TRACE_EVENT(event_ltl_monitor_id, + + TP_PROTO(struct task_struct *task, char *states, char *atoms, char *next), + + TP_ARGS(task, states, atoms, next), + + TP_STRUCT__entry( + __string(comm, task->comm) + __field(pid_t, pid) + __string(states, states) + __string(atoms, atoms) + __string(next, next) + ), + + TP_fast_assign( + __assign_str(comm); + __entry->pid =3D task->pid; + __assign_str(states); + __assign_str(atoms); + __assign_str(next); + ), + + TP_printk("%s[%d]: (%s) x (%s) -> (%s)", __get_str(comm), __entry->pid, _= _get_str(states), + __get_str(atoms), __get_str(next)) +); + +TRACE_EVENT(error_ltl_monitor_id, + + TP_PROTO(struct task_struct *task), + + TP_ARGS(task), + + TP_STRUCT__entry( + __string(comm, task->comm) + __field(pid_t, pid) + ), + + TP_fast_assign( + __assign_str(comm); + __entry->pid =3D task->pid; + ), + + TP_printk("%s[%d]: violation detected", __get_str(comm), __entry->pid) +); +// Add new monitors based on CONFIG_LTL_MON_EVENTS_ID here +#endif /* CONFIG_LTL_MON_EVENTS_ID */ #endif /* _TRACE_RV_H */ =20 /* This part must be outside protection */ diff --git a/tools/verification/rvgen/.gitignore b/tools/verification/rvgen= /.gitignore new file mode 100644 index 000000000000..1e288a076560 --- /dev/null +++ b/tools/verification/rvgen/.gitignore @@ -0,0 +1,3 @@ +__pycache__/ +parser.out +parsetab.py diff --git a/tools/verification/rvgen/Makefile b/tools/verification/rvgen/M= akefile index cca8c9ba82e8..cfc4056c1e87 100644 --- a/tools/verification/rvgen/Makefile +++ b/tools/verification/rvgen/Makefile @@ -21,5 +21,7 @@ install: $(INSTALL) rvgen/dot2k.py -D -m 644 $(DESTDIR)$(PYLIB)/rvgen/dot2k.py $(INSTALL) rvgen/container.py -D -m 644 $(DESTDIR)$(PYLIB)/rvgen/containe= r.py $(INSTALL) rvgen/generator.py -D -m 644 $(DESTDIR)$(PYLIB)/rvgen/generato= r.py + $(INSTALL) rvgen/ltl2ba.py -D -m 644 $(DESTDIR)$(PYLIB)/rvgen/ltl2ba.py + $(INSTALL) rvgen/ltl2k.py -D -m 644 $(DESTDIR)$(PYLIB)/rvgen/ltl2k.py $(INSTALL) __main__.py -D -m 755 $(DESTDIR)$(bindir)/rvgen cp -rp rvgen/templates $(DESTDIR)$(PYLIB)/rvgen/ diff --git a/tools/verification/rvgen/__main__.py b/tools/verification/rvge= n/__main__.py index 63ecf0c37034..fa6fc1f4de2f 100644 --- a/tools/verification/rvgen/__main__.py +++ b/tools/verification/rvgen/__main__.py @@ -12,6 +12,7 @@ if __name__ =3D=3D '__main__': from rvgen.dot2k import dot2k from rvgen.generator import Monitor from rvgen.container import Container + from rvgen.ltl2k import ltl2k import argparse import sys =20 @@ -44,7 +45,7 @@ if __name__ =3D=3D '__main__': if params.monitor_class =3D=3D "da": monitor =3D dot2k(params.spec, params.monitor_type, vars(p= arams)) elif params.monitor_class =3D=3D "ltl": - raise NotImplementedError + monitor =3D ltl2k(params.spec, params.monitor_type, vars(p= arams)) else: print("Unknown monitor class:", params.monitor_class) sys.exit(1) diff --git a/tools/verification/rvgen/rvgen/ltl2ba.py b/tools/verification/= rvgen/rvgen/ltl2ba.py new file mode 100644 index 000000000000..aa5c3339aab8 --- /dev/null +++ b/tools/verification/rvgen/rvgen/ltl2ba.py @@ -0,0 +1,558 @@ +#!/usr/bin/env python3 +# SPDX-License-Identifier: GPL-2.0-only +# +# Implementation based on +# Gerth, R., Peled, D., Vardi, M.Y., Wolper, P. (1996). +# Simple On-the-fly Automatic Verification of Linear Temporal Logic. +# https://doi.org/10.1007/978-0-387-34892-6_1 +# With extra optimizations + +from ply.lex import lex +from ply.yacc import yacc + +# Grammar: +# ltl ::=3D opd | ( ltl ) | ltl binop ltl | unop ltl +# +# Operands (opd): +# true, false, user-defined names +# +# Unary Operators (unop): +# always +# eventually +# not +# +# Binary Operators (binop): +# until +# and +# or +# imply +# equivalent + +tokens =3D ( + 'AND', + 'OR', + 'IMPLY', + 'UNTIL', + 'ALWAYS', + 'EVENTUALLY', + 'VARIABLE', + 'LITERAL', + 'NOT', + 'LPAREN', + 'RPAREN', + 'ASSIGN', +) + +t_AND =3D r'and' +t_OR =3D r'or' +t_IMPLY =3D r'imply' +t_UNTIL =3D r'until' +t_ALWAYS =3D r'always' +t_EVENTUALLY =3D r'eventually' +t_VARIABLE =3D r'[A-Z_0-9]+' +t_LITERAL =3D r'true|false' +t_NOT =3D r'not' +t_LPAREN =3D r'\(' +t_RPAREN =3D r'\)' +t_ASSIGN =3D r'=3D' +t_ignore_COMMENT =3D r'\#.*' +t_ignore =3D ' \t\n' + +def t_error(t): + raise ValueError("Illegal character '%s'" % t.value[0]) + +lexer =3D lex() + +class GraphNode: + uid =3D 0 + + def __init__(self, incoming: set['GraphNode'], new, old, _next): + self.init =3D False + self.outgoing =3D set() + self.labels =3D set() + self.incoming =3D incoming.copy() + self.new =3D new.copy() + self.old =3D old.copy() + self.next =3D _next.copy() + self.id =3D GraphNode.uid + GraphNode.uid +=3D 1 + + def expand(self, node_set): + if not self.new: + for nd in node_set: + if nd.old =3D=3D self.old and nd.next =3D=3D self.next: + nd.incoming |=3D self.incoming + return node_set + + new_current_node =3D GraphNode({self}, self.next, set(), set()) + return new_current_node.expand({self} | node_set) + n =3D self.new.pop() + return n.expand(self, node_set) + + def __lt__(self, other): + return self.id < other.id + +class ASTNode: + uid =3D 1 + + def __init__(self, op): + self.op =3D op + self.id =3D ASTNode.uid + ASTNode.uid +=3D 1 + + def __hash__(self): + return hash(self.op) + + def __eq__(self, other): + return self is other + + def __iter__(self): + yield self + yield from self.op + + def negate(self): + self.op =3D self.op.negate() + return self + + def expand(self, node, node_set): + return self.op.expand(self, node, node_set) + + def __str__(self): + if isinstance(self.op, Literal): + return str(self.op.value) + elif isinstance(self.op, Variable): + return self.op.name.lower() + return "val" + str(self.id) + + def normalize(self): + # Get rid of: + # - ALWAYS + # - EVENTUALLY + # - IMPLY + # And move all the NOT to be inside + self.op =3D self.op.normalize() + return self + +class BinaryOp: + op_str =3D "not_supported" + + def __init__(self, left: ASTNode, right: ASTNode): + self.left =3D left + self.right =3D right + + def __hash__(self): + return hash((self.left, self.right)) + + def __iter__(self): + yield from self.left + yield from self.right + + def normalize(self): + raise NotImplementedError + + def negate(self): + raise NotImplementedError + + def _is_temporal(self): + raise NotImplementedError + + def is_temporal(self): + if self.left.op.is_temporal(): + return True + if self.right.op.is_temporal(): + return True + return self._is_temporal() + + @staticmethod + def expand(n: ASTNode, node: GraphNode, node_set) -> set[GraphNode]: + raise NotImplementedError + +class AndOp(BinaryOp): + op_str =3D '&&' + + def __init__(self, left, right): + super().__init__(left, right) + + def normalize(self): + return self + + def negate(self): + return OrOp(self.left.negate(), self.right.negate()) + + def _is_temporal(self): + return False + + @staticmethod + def expand(n: ASTNode, node: GraphNode, node_set) -> set[GraphNode]: + if not n.op.is_temporal(): + node.old.add(n) + return node.expand(node_set) + + tmp =3D GraphNode(node.incoming, + node.new | ({n.op.left, n.op.right} - node.old), + node.old | {n}, + node.next) + return tmp.expand(node_set) + +class OrOp(BinaryOp): + op_str =3D '||' + + def __init__(self, left, right): + super().__init__(left, right) + + def normalize(self): + return self + + def negate(self): + return AndOp(self.left.negate(), self.right.negate()) + + def _is_temporal(self): + return False + + @staticmethod + def expand(n: ASTNode, node: GraphNode, node_set) -> set[GraphNode]: + if not n.op.is_temporal(): + node.old |=3D {n} + return node.expand(node_set) + + node1 =3D GraphNode(node.incoming, + node.new | ({n.op.left} - node.old), + node.old | {n}, + node.next) + node2 =3D GraphNode(node.incoming, + node.new | ({n.op.right} - node.old), + node.old | {n}, + node.next) + return node2.expand(node1.expand(node_set)) + +class UntilOp(BinaryOp): + def __init__(self, left, right): + super().__init__(left, right) + + def normalize(self): + return self + + def negate(self): + return VOp(self.left.negate(), self.right.negate()) + + def _is_temporal(self): + return True + + @staticmethod + def expand(n: ASTNode, node: GraphNode, node_set) -> set[GraphNode]: + node1 =3D GraphNode(node.incoming, + node.new | ({n.op.left} - node.old), + node.old | {n}, + node.next | {n}) + node2 =3D GraphNode(node.incoming, + node.new | ({n.op.right} - node.old), + node.old | {n}, + node.next) + return node2.expand(node1.expand(node_set)) + +class VOp(BinaryOp): + def __init__(self, left, right): + super().__init__(left, right) + + def normalize(self): + return self + + def negate(self): + return UntilOp(self.left.negate(), self.right.negate()) + + def _is_temporal(self): + return True + + @staticmethod + def expand(n: ASTNode, node: GraphNode, node_set) -> set[GraphNode]: + node1 =3D GraphNode(node.incoming, + node.new | ({n.op.right} - node.old), + node.old | {n}, + node.next | {n}) + node2 =3D GraphNode(node.incoming, + node.new | ({n.op.left, n.op.right} - node.old), + node.old | {n}, + node.next) + return node2.expand(node1.expand(node_set)) + +class ImplyOp(BinaryOp): + def __init__(self, left, right): + super().__init__(left, right) + + def normalize(self): + # P -> Q =3D=3D=3D !P | Q + return OrOp(self.left.negate(), self.right) + + def _is_temporal(self): + return False + + def negate(self): + # !(P -> Q) =3D=3D=3D !(!P | Q) =3D=3D=3D P & !Q + return AndOp(self.left, self.right.negate()) + +class UnaryOp: + def __init__(self, child: ASTNode): + self.child =3D child + + def __iter__(self): + yield from self.child + + def __hash__(self): + return hash(self.child) + + def normalize(self): + raise NotImplementedError + + def _is_temporal(self): + raise NotImplementedError + + def is_temporal(self): + if self.child.op.is_temporal(): + return True + return self._is_temporal() + + def negate(self): + raise NotImplementedError + +class EventuallyOp(UnaryOp): + def __init__(self, child): + super().__init__(child) + + def __str__(self): + return "eventually " + str(self.child) + + def normalize(self): + # <>F =3D=3D true U F + return UntilOp(Literal(True), self.right) + + def _is_temporal(self): + return True + + def negate(self): + # !<>F =3D=3D [](!F) + return AlwaysOp(self.right.negate()).normalize() + +class AlwaysOp(UnaryOp): + def __init__(self, child): + super().__init__(child) + + def normalize(self): + # []F =3D=3D=3D !(true U !F) =3D=3D false V F + new =3D ASTNode(Literal(False)) + return VOp(new, self.child) + + def _is_temporal(self): + return True + + def negate(self): + # ![]F =3D=3D <>(!F) + return EventuallyOp(self.left, self.right.negate()).normalize() + +class NotOp(UnaryOp): + def __init__(self, child): + super().__init__(child) + + def __str__(self): + return "!" + str(self.child) + + def normalize(self): + return self.child.op.negate() + + def negate(self): + return self.child.op + + def _is_temporal(self): + return False + + @staticmethod + def expand(n: ASTNode, node: GraphNode, node_set) -> set[GraphNode]: + for f in node.old: + if n.op.child is f: + return node_set + node.old |=3D {n} + return node.expand(node_set) + +class Variable: + def __init__(self, name: str): + self.name =3D name + + def __hash__(self): + return hash(self.name) + + def __iter__(self): + yield from () + + def negate(self): + new =3D ASTNode(self) + return NotOp(new) + + def normalize(self): + return self + + def is_temporal(self): + return False + + @staticmethod + def expand(n: ASTNode, node: GraphNode, node_set) -> set[GraphNode]: + for f in node.old: + if isinstance(f, NotOp) and f.op.child is n: + return node_set + node.old |=3D {n} + return node.expand(node_set) + +class Literal: + def __init__(self, value: bool): + self.value =3D value + + def __iter__(self): + yield from () + + def __hash__(self): + return hash(self.value) + + def __str__(self): + if self.value: + return "true" + return "false" + + def negate(self): + self.value =3D not self.value + return self + + def normalize(self): + return self + + def is_temporal(self): + return False + + @staticmethod + def expand(n: ASTNode, node: GraphNode, node_set) -> set[GraphNode]: + if not n.op.value: + return node_set + node.old |=3D {n} + return node.expand(node_set) + +def p_spec(p): + ''' + spec : assign + | assign spec + ''' + if len(p) =3D=3D 3: + p[2].append(p[1]) + p[0] =3D p[2] + else: + p[0] =3D [p[1]] + +def p_assign(p): + ''' + assign : VARIABLE ASSIGN ltl + ''' + p[0] =3D (p[1], p[3]) + +def p_ltl(p): + ''' + ltl : opd + | binop + | unop + ''' + p[0] =3D p[1] + +def p_opd(p): + ''' + opd : VARIABLE + | LITERAL + | LPAREN ltl RPAREN + ''' + if p[1] =3D=3D "true": + p[0] =3D ASTNode(Literal(True)) + elif p[1] =3D=3D "false": + p[0] =3D ASTNode(Literal(False)) + elif p[1] =3D=3D '(': + p[0] =3D p[2] + else: + p[0] =3D ASTNode(Variable(p[1])) + +def p_unop(p): + ''' + unop : ALWAYS ltl + | EVENTUALLY ltl + | NOT ltl + ''' + if p[1] =3D=3D "always": + op =3D AlwaysOp(p[2]) + if p[1] =3D=3D "eventually": + op =3D EventuallyOp(p[2]) + if p[1] =3D=3D "not": + op =3D NotOp(p[2]) + + p[0] =3D ASTNode(op) + +def p_binop(p): + ''' + binop : opd UNTIL ltl + | opd AND ltl + | opd OR ltl + | opd IMPLY ltl + ''' + if p[2] =3D=3D "and": + op =3D AndOp(p[1], p[3]) + elif p[2] =3D=3D "until": + op =3D UntilOp(p[1], p[3]) + elif p[2] =3D=3D "or": + op =3D OrOp(p[1], p[3]) + elif p[2] =3D=3D "imply": + op =3D ImplyOp(p[1], p[3]) + else: + raise ValueError("Invalid binary operator: %s" % p[2]) + + p[0] =3D ASTNode(op) + +parser =3D yacc() + +def parse_ltl(s: str) -> ASTNode: + spec =3D parser.parse(s) + + subexpr =3D dict() + + for assign in spec: + if assign[0] =3D=3D "RULE": + rule =3D assign[1] + else: + subexpr[assign[0]] =3D assign[1] + + for node in rule: + if not isinstance(node.op, Variable): + continue + replace =3D subexpr.get(node.op.name) + if replace is not None: + node.op =3D replace.op + + return rule + +def create_graph(s: str): + atoms =3D set() + + ltl =3D parse_ltl(s) + for c in ltl: + c.normalize() + if isinstance(c.op, Variable): + atoms.add(c.op.name) + + init =3D GraphNode(set(), set(), set(), set()) + head =3D GraphNode({init}, {ltl}, set(), set()) + graph =3D sorted(head.expand(set())) + + for i, node in enumerate(graph): + # The id assignment during graph generation has gaps. Reassign them + node.id =3D i + + for incoming in node.incoming: + if incoming is init: + node.init =3D True + else: + incoming.outgoing.add(node) + for o in node.old: + if not o.op.is_temporal(): + node.labels.add(str(o)) + + return sorted(atoms), graph, ltl diff --git a/tools/verification/rvgen/rvgen/ltl2k.py b/tools/verification/r= vgen/rvgen/ltl2k.py new file mode 100644 index 000000000000..b8da9094fb4f --- /dev/null +++ b/tools/verification/rvgen/rvgen/ltl2k.py @@ -0,0 +1,245 @@ +#!/usr/bin/env python3 +# SPDX-License-Identifier: GPL-2.0-only + +from pathlib import Path +from . import generator +from . import ltl2ba + +COLUMN_LIMIT =3D 100 + +def line_len(line: str) -> int: + tabs =3D line.count('\t') + return tabs * 7 + len(line) + +def break_long_line(line: str, indent=3D'') -> list[str]: + result =3D [] + while line_len(line) > COLUMN_LIMIT: + i =3D line[:COLUMN_LIMIT - line_len(line)].rfind(' ') + result.append(line[:i]) + line =3D indent + line[i + 1:] + if line: + result.append(line) + return result + +def build_condition_string(node: ltl2ba.GraphNode): + if not node.labels: + return "(true)" + + result =3D "(" + + first =3D True + for label in sorted(node.labels): + if not first: + result +=3D " && " + result +=3D label + first =3D False + + result +=3D ")" + + return result + +def abbreviate_atoms(atoms: list[str]) -> list[str]: + def shorten(s: str) -> str: + skip =3D ["is", "by", "or", "and"] + return '_'.join([x[:2] for x in s.lower().split('_') if x not in s= kip]) + + abbrs =3D [] + for atom in atoms: + for i in range(len(atom), -1, -1): + if sum(a.startswith(atom[:i]) for a in atoms) > 1: + break + share =3D atom[:i] + unique =3D atom[i:] + abbrs.append((shorten(share) + shorten(unique))) + return abbrs + +class ltl2k(generator.Monitor): + template_dir =3D "ltl2k" + + def __init__(self, file_path, MonitorType, extra_params=3D{}): + if MonitorType !=3D "per_task": + raise NotImplementedError("Only per_task monitor is supported = for LTL") + super().__init__(extra_params) + with open(file_path) as f: + self.atoms, self.ba, self.ltl =3D ltl2ba.create_graph(f.read()) + self.atoms_abbr =3D abbreviate_atoms(self.atoms) + self.name =3D extra_params.get("model_name") + if not self.name: + self.name =3D Path(file_path).stem + + def _fill_states(self) -> str: + buf =3D [ + "enum ltl_buchi_state {", + ] + + for node in self.ba: + buf.append("\tS%i," % node.id) + buf.append("\tRV_NUM_BA_STATES") + buf.append("};") + buf.append("static_assert(RV_NUM_BA_STATES <=3D RV_MAX_BA_STATES);= ") + return buf + + def _fill_atoms(self): + buf =3D ["enum ltl_atom {"] + for a in sorted(self.atoms): + buf.append("\tLTL_%s," % a) + buf.append("\tLTL_NUM_ATOM") + buf.append("};") + buf.append("static_assert(LTL_NUM_ATOM <=3D RV_MAX_LTL_ATOM);") + return buf + + def _fill_atoms_to_string(self): + buf =3D [ + "static const char *ltl_atom_str(enum ltl_atom atom)", + "{", + "\tstatic const char *const names[] =3D {" + ] + + for name in self.atoms_abbr: + buf.append("\t\t\"%s\"," % name) + + buf.extend([ + "\t};", + "", + "\treturn names[atom];", + "}" + ]) + return buf + + def _fill_atom_values(self): + buf =3D [] + for node in self.ltl: + if node.op.is_temporal(): + continue + + if isinstance(node.op, ltl2ba.Variable): + buf.append("\tbool %s =3D test_bit(LTL_%s, mon->atoms);" %= (node, node.op.name)) + elif isinstance(node.op, ltl2ba.AndOp): + buf.append("\tbool %s =3D %s && %s;" % (node, node.op.left= , node.op.right)) + elif isinstance(node.op, ltl2ba.OrOp): + buf.append("\tbool %s =3D %s || %s;" % (node, node.op.left= , node.op.right)) + elif isinstance(node.op, ltl2ba.NotOp): + buf.append("\tbool %s =3D !%s;" % (node, node.op.child)) + buf.reverse() + + buf2 =3D [] + for line in buf: + buf2.extend(break_long_line(line, "\t ")) + return buf2 + + def _fill_transitions(self): + buf =3D [ + "static void", + "ltl_possible_next_states(struct ltl_monitor *mon, unsigned in= t state, unsigned long *next)", + "{" + ] + buf.extend(self._fill_atom_values()) + buf.extend([ + "", + "\tswitch (state) {" + ]) + + for node in self.ba: + buf.append("\tcase S%i:" % node.id) + + for o in sorted(node.outgoing): + line =3D "\t\tif " + indent =3D "\t\t " + + line +=3D build_condition_string(o) + lines =3D break_long_line(line, indent) + buf.extend(lines) + + buf.append("\t\t\t__set_bit(S%i, next);" % o.id) + buf.append("\t\tbreak;") + buf.extend([ + "\t}", + "}" + ]) + + return buf + + def _fill_start(self): + buf =3D [ + "static void ltl_start(struct task_struct *task, struct ltl_mo= nitor *mon)", + "{" + ] + buf.extend(self._fill_atom_values()) + buf.append("") + + for node in self.ba: + if not node.init: + continue + + line =3D "\tif " + indent =3D "\t " + + line +=3D build_condition_string(node) + lines =3D break_long_line(line, indent) + buf.extend(lines) + + buf.append("\t\t__set_bit(S%i, mon->states);" % node.id) + buf.append("}") + return buf + + def fill_tracepoint_handlers_skel(self): + buff =3D [] + buff.append("static void handle_example_event(void *data, /* XXX: = fill header */)") + buff.append("{") + buff.append("\tltl_atom_update(task, LTL_%s, true/false);" % self.= atoms[0]) + buff.append("}") + buff.append("") + return '\n'.join(buff) + + def fill_tracepoint_attach_probe(self): + return "\trv_attach_trace_probe(\"%s\", /* XXX: tracepoint */, han= dle_example_event);" \ + % self.name + + def fill_tracepoint_detach_helper(self): + return "\trv_detach_trace_probe(\"%s\", /* XXX: tracepoint */, han= dle_sample_event);" \ + % self.name + + def fill_atoms_init(self): + buff =3D [] + for a in self.atoms: + buff.append("\tltl_atom_set(mon, LTL_%s, true/false);" % a) + return '\n'.join(buff) + + def fill_model_h(self): + buf =3D [ + "/* SPDX-License-Identifier: GPL-2.0 */", + "", + "#include ", + "", + "#define MONITOR_NAME " + self.name, + "" + ] + + buf.extend(self._fill_atoms()) + buf.append('') + + buf.extend(self._fill_atoms_to_string()) + buf.append('') + + buf.extend(self._fill_states()) + buf.append('') + + buf.extend(self._fill_start()) + buf.append('') + + buf.extend(self._fill_transitions()) + buf.append('') + + return '\n'.join(buf) + + def fill_monitor_class_type(self): + return "LTL_MON_EVENTS_ID" + + def fill_monitor_class(self): + return "ltl_monitor_id" + + def fill_main_c(self): + main_c =3D super().fill_main_c() + main_c =3D main_c.replace("%%ATOMS_INIT%%", self.fill_atoms_init()) + + return main_c diff --git a/tools/verification/rvgen/rvgen/templates/ltl2k/main.c b/tools/= verification/rvgen/rvgen/templates/ltl2k/main.c new file mode 100644 index 000000000000..2f3c4d642746 --- /dev/null +++ b/tools/verification/rvgen/rvgen/templates/ltl2k/main.c @@ -0,0 +1,102 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#include +#include +#include +#include +#include +#include + +#define MODULE_NAME "%%MODEL_NAME%%" + +/* + * XXX: include required tracepoint headers, e.g., + * #include + */ +#include +%%INCLUDE_PARENT%% + +/* + * This is the self-generated part of the monitor. Generally, there is no = need + * to touch this section. + */ +#include "%%MODEL_NAME%%.h" +#include + +static void ltl_atoms_fetch(struct task_struct *task, struct ltl_monitor *= mon) +{ + /* + * This is called everytime the Buchi automaton is triggered. + * + * This function could be used to fetch the atomic propositions which are= expensive to + * trace. It is possible only if the atomic proposition does not need to = be updated at + * precise time. + * + * It is recommended to use tracepoints and ltl_atom_update() instead. + */ +} + +static void ltl_atoms_init(struct task_struct *task, struct ltl_monitor *m= on, bool task_creation) +{ + /* + * This should initialize as many atomic propositions as possible. + * + * @task_creation indicates whether the task is being created. This is fa= lse if the task is + * already running before the monitor is enabled. + */ +%%ATOMS_INIT%% +} + +/* + * This is the instrumentation part of the monitor. + * + * This is the section where manual work is required. Here the kernel even= ts + * are translated into model's event. + */ +%%TRACEPOINT_HANDLERS_SKEL%% +static int enable_%%MODEL_NAME%%(void) +{ + int retval; + + retval =3D ltl_monitor_init(); + if (retval) + return retval; + +%%TRACEPOINT_ATTACH%% + + return 0; +} + +static void disable_%%MODEL_NAME%%(void) +{ +%%TRACEPOINT_DETACH%% + + ltl_monitor_destroy(); +} + +/* + * This is the monitor register section. + */ +static struct rv_monitor rv_%%MODEL_NAME%% =3D { + .name =3D "%%MODEL_NAME%%", + .description =3D "%%DESCRIPTION%%", + .enable =3D enable_%%MODEL_NAME%%, + .disable =3D disable_%%MODEL_NAME%%, +}; + +static int __init register_%%MODEL_NAME%%(void) +{ + return rv_register_monitor(&rv_%%MODEL_NAME%%, %%PARENT%%); +} + +static void __exit unregister_%%MODEL_NAME%%(void) +{ + rv_unregister_monitor(&rv_%%MODEL_NAME%%); +} + +module_init(register_%%MODEL_NAME%%); +module_exit(unregister_%%MODEL_NAME%%); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR(/* TODO */); +MODULE_DESCRIPTION("%%MODEL_NAME%%: %%DESCRIPTION%%"); diff --git a/tools/verification/rvgen/rvgen/templates/ltl2k/trace.h b/tools= /verification/rvgen/rvgen/templates/ltl2k/trace.h new file mode 100644 index 000000000000..49394c4b0f1c --- /dev/null +++ b/tools/verification/rvgen/rvgen/templates/ltl2k/trace.h @@ -0,0 +1,14 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +/* + * Snippet to be included in rv_trace.h + */ + +#ifdef CONFIG_RV_MON_%%MODEL_NAME_UP%% +DEFINE_EVENT(event_%%MONITOR_CLASS%%, event_%%MODEL_NAME%%, + TP_PROTO(struct task_struct *task, char *states, char *atoms, char *= next), + TP_ARGS(task, states, atoms, next)); +DEFINE_EVENT(error_%%MONITOR_CLASS%%, error_%%MODEL_NAME%%, + TP_PROTO(struct task_struct *task), + TP_ARGS(task)); +#endif /* CONFIG_RV_MON_%%MODEL_NAME_UP%% */ --=20 2.39.5 From nobody Thu Dec 18 04:57:59 2025 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0159E267F4F; 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The monitors will be added in the follow-up commits. Reviewed-by: Gabriele Monaco Signed-off-by: Nam Cao --- kernel/trace/rv/Kconfig | 1 + kernel/trace/rv/Makefile | 1 + kernel/trace/rv/monitors/rtapp/Kconfig | 6 +++++ kernel/trace/rv/monitors/rtapp/rtapp.c | 33 ++++++++++++++++++++++++++ kernel/trace/rv/monitors/rtapp/rtapp.h | 3 +++ 5 files changed, 44 insertions(+) create mode 100644 kernel/trace/rv/monitors/rtapp/Kconfig create mode 100644 kernel/trace/rv/monitors/rtapp/rtapp.c create mode 100644 kernel/trace/rv/monitors/rtapp/rtapp.h diff --git a/kernel/trace/rv/Kconfig b/kernel/trace/rv/Kconfig index 6e157f964991..5c407d291661 100644 --- a/kernel/trace/rv/Kconfig +++ b/kernel/trace/rv/Kconfig @@ -41,6 +41,7 @@ source "kernel/trace/rv/monitors/snroc/Kconfig" source "kernel/trace/rv/monitors/scpd/Kconfig" source "kernel/trace/rv/monitors/snep/Kconfig" source "kernel/trace/rv/monitors/sncid/Kconfig" +source "kernel/trace/rv/monitors/rtapp/Kconfig" # Add new monitors here =20 config RV_REACTORS diff --git a/kernel/trace/rv/Makefile b/kernel/trace/rv/Makefile index f9b2cd0483c3..9b28c2419995 100644 --- a/kernel/trace/rv/Makefile +++ b/kernel/trace/rv/Makefile @@ -12,6 +12,7 @@ obj-$(CONFIG_RV_MON_SNROC) +=3D monitors/snroc/snroc.o obj-$(CONFIG_RV_MON_SCPD) +=3D monitors/scpd/scpd.o obj-$(CONFIG_RV_MON_SNEP) +=3D monitors/snep/snep.o obj-$(CONFIG_RV_MON_SNCID) +=3D monitors/sncid/sncid.o +obj-$(CONFIG_RV_MON_RTAPP) +=3D monitors/rtapp/rtapp.o # Add new monitors here obj-$(CONFIG_RV_REACTORS) +=3D rv_reactors.o obj-$(CONFIG_RV_REACT_PRINTK) +=3D reactor_printk.o diff --git a/kernel/trace/rv/monitors/rtapp/Kconfig b/kernel/trace/rv/monit= ors/rtapp/Kconfig new file mode 100644 index 000000000000..94689d66a79c --- /dev/null +++ b/kernel/trace/rv/monitors/rtapp/Kconfig @@ -0,0 +1,6 @@ +config RV_MON_RTAPP + depends on RV + bool "rtapp monitor" + help + Collection of monitors to check for common problems with real-time appl= ication that cause + unexpected latency. diff --git a/kernel/trace/rv/monitors/rtapp/rtapp.c b/kernel/trace/rv/monit= ors/rtapp/rtapp.c new file mode 100644 index 000000000000..fd75fc927d65 --- /dev/null +++ b/kernel/trace/rv/monitors/rtapp/rtapp.c @@ -0,0 +1,33 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#include +#include +#include + +#define MODULE_NAME "rtapp" + +#include "rtapp.h" + +struct rv_monitor rv_rtapp; + +struct rv_monitor rv_rtapp =3D { + .name =3D "rtapp", + .description =3D "Collection of monitors for detecting problems with real= -time applications", +}; + +static int __init register_rtapp(void) +{ + return rv_register_monitor(&rv_rtapp, NULL); +} + +static void __exit unregister_rtapp(void) +{ + rv_unregister_monitor(&rv_rtapp); +} + +module_init(register_rtapp); +module_exit(unregister_rtapp); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Nam Cao "); +MODULE_DESCRIPTION("Collection of monitors for detecting problems with rea= l-time applications"); diff --git a/kernel/trace/rv/monitors/rtapp/rtapp.h b/kernel/trace/rv/monit= ors/rtapp/rtapp.h new file mode 100644 index 000000000000..4c200d67c7f6 --- /dev/null +++ b/kernel/trace/rv/monitors/rtapp/rtapp.h @@ -0,0 +1,3 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +extern struct rv_monitor rv_rtapp; --=20 2.39.5 From nobody Thu Dec 18 04:57:59 2025 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AE3F826980D; 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a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1745391039; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=UPn4Z3qJtGRDNuo4zQemDZcbXpzyUcw6dR3h1cNGvUo=; b=UHM9eaqsn67trtwY6W81AvNK1og/S+zzrNC2mjhdOVd9LtU/s1NAeqZC/17bn8dSmk+SBk aTuAkvXFH7p6JBAw== To: Steven Rostedt , Gabriele Monaco , linux-trace-kernel@vger.kernel.org, linux-kernel@vger.kernel.org Cc: john.ogness@linutronix.de, Nam Cao , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H . Peter Anvin" , Andy Lutomirski , Peter Zijlstra Subject: [PATCH v4 15/22] x86/tracing: Remove redundant trace_pagefault_key Date: Wed, 23 Apr 2025 08:50:10 +0200 Message-Id: In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" trace_pagefault_key is used to optimize the pagefault tracepoints when it is disabled. However, tracepoints already have built-in static_key for this exact purpose. Remove this redundant key. Signed-off-by: Nam Cao --- Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Borislav Petkov Cc: Dave Hansen Cc: x86@kernel.org Cc: H. Peter Anvin Cc: Andy Lutomirski Cc: Peter Zijlstra --- arch/x86/include/asm/trace/common.h | 12 ------------ arch/x86/include/asm/trace/exceptions.h | 18 ++++++------------ arch/x86/include/asm/trace/irq_vectors.h | 1 - arch/x86/kernel/Makefile | 1 - arch/x86/kernel/tracepoint.c | 21 --------------------- arch/x86/mm/fault.c | 3 --- 6 files changed, 6 insertions(+), 50 deletions(-) delete mode 100644 arch/x86/include/asm/trace/common.h delete mode 100644 arch/x86/kernel/tracepoint.c diff --git a/arch/x86/include/asm/trace/common.h b/arch/x86/include/asm/tra= ce/common.h deleted file mode 100644 index f0f9bcdb74d9..000000000000 --- a/arch/x86/include/asm/trace/common.h +++ /dev/null @@ -1,12 +0,0 @@ -#ifndef _ASM_TRACE_COMMON_H -#define _ASM_TRACE_COMMON_H - -#ifdef CONFIG_TRACING -DECLARE_STATIC_KEY_FALSE(trace_pagefault_key); -#define trace_pagefault_enabled() \ - static_branch_unlikely(&trace_pagefault_key) -#else -static inline bool trace_pagefault_enabled(void) { return false; } -#endif - -#endif diff --git a/arch/x86/include/asm/trace/exceptions.h b/arch/x86/include/asm= /trace/exceptions.h index 6b1e87194809..34bc8214a2d7 100644 --- a/arch/x86/include/asm/trace/exceptions.h +++ b/arch/x86/include/asm/trace/exceptions.h @@ -6,10 +6,6 @@ #define _TRACE_PAGE_FAULT_H =20 #include -#include - -extern int trace_pagefault_reg(void); -extern void trace_pagefault_unreg(void); =20 DECLARE_EVENT_CLASS(x86_exceptions, =20 @@ -34,15 +30,13 @@ DECLARE_EVENT_CLASS(x86_exceptions, (void *)__entry->address, (void *)__entry->ip, __entry->error_code) ); =20 -#define DEFINE_PAGE_FAULT_EVENT(name) \ -DEFINE_EVENT_FN(x86_exceptions, name, \ - TP_PROTO(unsigned long address, struct pt_regs *regs, \ - unsigned long error_code), \ - TP_ARGS(address, regs, error_code), \ - trace_pagefault_reg, trace_pagefault_unreg); +DEFINE_EVENT(x86_exceptions, page_fault_user, + TP_PROTO(unsigned long address, struct pt_regs *regs, unsigned long error= _code), + TP_ARGS(address, regs, error_code)); =20 -DEFINE_PAGE_FAULT_EVENT(page_fault_user); -DEFINE_PAGE_FAULT_EVENT(page_fault_kernel); +DEFINE_EVENT(x86_exceptions, page_fault_kernel, + TP_PROTO(unsigned long address, struct pt_regs *regs, unsigned long error= _code), + TP_ARGS(address, regs, error_code)); =20 #undef TRACE_INCLUDE_PATH #undef TRACE_INCLUDE_FILE diff --git a/arch/x86/include/asm/trace/irq_vectors.h b/arch/x86/include/as= m/trace/irq_vectors.h index 88e7f0f3bf62..7408bebdfde0 100644 --- a/arch/x86/include/asm/trace/irq_vectors.h +++ b/arch/x86/include/asm/trace/irq_vectors.h @@ -6,7 +6,6 @@ #define _TRACE_IRQ_VECTORS_H =20 #include -#include =20 #ifdef CONFIG_X86_LOCAL_APIC =20 diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile index b43eb7e384eb..e8e33ec684ba 100644 --- a/arch/x86/kernel/Makefile +++ b/arch/x86/kernel/Makefile @@ -139,7 +139,6 @@ obj-$(CONFIG_OF) +=3D devicetree.o obj-$(CONFIG_UPROBES) +=3D uprobes.o =20 obj-$(CONFIG_PERF_EVENTS) +=3D perf_regs.o -obj-$(CONFIG_TRACING) +=3D tracepoint.o obj-$(CONFIG_SCHED_MC_PRIO) +=3D itmt.o obj-$(CONFIG_X86_UMIP) +=3D umip.o =20 diff --git a/arch/x86/kernel/tracepoint.c b/arch/x86/kernel/tracepoint.c deleted file mode 100644 index 03ae1caaa878..000000000000 --- a/arch/x86/kernel/tracepoint.c +++ /dev/null @@ -1,21 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * Copyright (C) 2013 Seiji Aguchi - */ -#include -#include - -#include - -DEFINE_STATIC_KEY_FALSE(trace_pagefault_key); - -int trace_pagefault_reg(void) -{ - static_branch_inc(&trace_pagefault_key); - return 0; -} - -void trace_pagefault_unreg(void) -{ - static_branch_dec(&trace_pagefault_key); -} diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c index 296d294142c8..7e3e51fa1f95 100644 --- a/arch/x86/mm/fault.c +++ b/arch/x86/mm/fault.c @@ -1455,9 +1455,6 @@ static __always_inline void trace_page_fault_entries(struct pt_regs *regs, unsigned long error_code, unsigned long address) { - if (!trace_pagefault_enabled()) - return; - if (user_mode(regs)) trace_page_fault_user(address, regs, error_code); else --=20 2.39.5 From nobody Thu Dec 18 04:57:59 2025 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id ADA772690F9; Wed, 23 Apr 2025 06:50:46 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55 ARC-Seal: i=1; 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Peter Anvin" , Andy Lutomirski , Peter Zijlstra Subject: [PATCH v4 16/22] x86/tracing: Move page fault trace points to generic Date: Wed, 23 Apr 2025 08:50:11 +0200 Message-Id: <006b246230a45165430fc9dd496d2908ffbebb6c.1745390829.git.namcao@linutronix.de> In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Page fault trace points are interesting for other architectures as well. Move them to be generic. Signed-off-by: Nam Cao --- Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Borislav Petkov Cc: Dave Hansen Cc: x86@kernel.org Cc: "H. Peter Anvin" Cc: Andy Lutomirski Cc: Peter Zijlstra --- arch/x86/mm/fault.c | 2 +- .../asm/trace =3D> include/trace/events}/exceptions.h | 13 ++++--------- 2 files changed, 5 insertions(+), 10 deletions(-) rename {arch/x86/include/asm/trace =3D> include/trace/events}/exceptions.h= (79%) diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c index 7e3e51fa1f95..ad4cb1502316 100644 --- a/arch/x86/mm/fault.c +++ b/arch/x86/mm/fault.c @@ -38,7 +38,7 @@ #include /* snp_dump_hva_rmpentry() */ =20 #define CREATE_TRACE_POINTS -#include +#include =20 /* * Returns 0 if mmiotrace is disabled, or if the fault is not diff --git a/arch/x86/include/asm/trace/exceptions.h b/include/trace/events= /exceptions.h similarity index 79% rename from arch/x86/include/asm/trace/exceptions.h rename to include/trace/events/exceptions.h index 34bc8214a2d7..a631f8de8917 100644 --- a/arch/x86/include/asm/trace/exceptions.h +++ b/include/trace/events/exceptions.h @@ -7,7 +7,7 @@ =20 #include =20 -DECLARE_EVENT_CLASS(x86_exceptions, +DECLARE_EVENT_CLASS(exceptions, =20 TP_PROTO(unsigned long address, struct pt_regs *regs, unsigned long error_code), @@ -22,7 +22,7 @@ DECLARE_EVENT_CLASS(x86_exceptions, =20 TP_fast_assign( __entry->address =3D address; - __entry->ip =3D regs->ip; + __entry->ip =3D instruction_pointer(regs); __entry->error_code =3D error_code; ), =20 @@ -30,18 +30,13 @@ DECLARE_EVENT_CLASS(x86_exceptions, (void *)__entry->address, (void *)__entry->ip, __entry->error_code) ); =20 -DEFINE_EVENT(x86_exceptions, page_fault_user, +DEFINE_EVENT(exceptions, page_fault_user, TP_PROTO(unsigned long address, struct pt_regs *regs, unsigned long error= _code), TP_ARGS(address, regs, error_code)); - -DEFINE_EVENT(x86_exceptions, page_fault_kernel, +DEFINE_EVENT(exceptions, page_fault_kernel, TP_PROTO(unsigned long address, struct pt_regs *regs, unsigned long error= _code), TP_ARGS(address, regs, error_code)); =20 -#undef TRACE_INCLUDE_PATH -#undef TRACE_INCLUDE_FILE -#define TRACE_INCLUDE_PATH . -#define TRACE_INCLUDE_FILE exceptions #endif /* _TRACE_PAGE_FAULT_H */ =20 /* This part must be outside protection */ --=20 2.39.5 From nobody Thu Dec 18 04:57:59 2025 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 609292690C8; 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dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=tB7TvnSr; arc=none smtp.client-ip=193.142.43.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="KkFupDfh"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="tB7TvnSr" From: Nam Cao DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1745391040; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=X+UQEszhhyx5orvv0upRMEVuQLmNZT576sheEcGpELI=; b=KkFupDfhQSk61/vC+jqfdqXAxGK+O6AjEf6C2kGQ5fPArn2moBe9n1SBwtYtDaflHuVetC DKkuWNTs6MsOM17dJYZjBbGewK4pqiEa7T4CRhEQd0y4z1dWQwN9yGcHxpeGtNMX8krEX2 zB9TG7fyPNaaqUMRUUSqjsdQzV+MbNbcOQrDT2QQd7H/IKhaNS15sivjXJfeN2fSJQ+USv 7MsKcQLopMkRVooCo9wVuOXtahW+YdEnprOjmGsbedunBoyRZBvd03ihEZutH4XzdzpIAb oU7mP+qPT8Cf1WTVdGWhISe3+0ZJ5xDug0Atx10JNdZNRWWyagPrGiMAVWQUqA== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1745391040; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=X+UQEszhhyx5orvv0upRMEVuQLmNZT576sheEcGpELI=; b=tB7TvnSr3wIcMC6krcZbNqPS4mirEPlVVgr428x4b1TbyVzBlyWhNszjdtfvXn9gS4Apv+ 8fsj7DrGsOONzdBg== To: Steven Rostedt , Gabriele Monaco , linux-trace-kernel@vger.kernel.org, linux-kernel@vger.kernel.org Cc: john.ogness@linutronix.de, Nam Cao , Catalin Marinas , Will Deacon , linux-arm-kernel@lists.infradead.org Subject: [PATCH v4 17/22] arm64: mm: Add page fault trace points Date: Wed, 23 Apr 2025 08:50:12 +0200 Message-Id: In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add page fault trace points, which are useful to implement RV monitor which watches page faults. Signed-off-by: Nam Cao --- Cc: Catalin Marinas Cc: Will Deacon Cc: linux-arm-kernel@lists.infradead.org --- arch/arm64/mm/fault.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c index ef63651099a9..e3f096b0dffd 100644 --- a/arch/arm64/mm/fault.c +++ b/arch/arm64/mm/fault.c @@ -44,6 +44,9 @@ #include #include =20 +#define CREATE_TRACE_POINTS +#include + struct fault_info { int (*fn)(unsigned long far, unsigned long esr, struct pt_regs *regs); @@ -559,6 +562,11 @@ static int __kprobes do_page_fault(unsigned long far, = unsigned long esr, if (kprobe_page_fault(regs, esr)) return 0; =20 + if (user_mode(regs)) + trace_page_fault_user(addr, regs, esr); + else + trace_page_fault_kernel(addr, regs, esr); + /* * If we're in an interrupt or have no user context, we must not take * the fault. --=20 2.39.5 From nobody Thu Dec 18 04:57:59 2025 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AD322267B15; Wed, 23 Apr 2025 06:50:46 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745391049; cv=none; b=CeRDAdhnchORpI+lg/YP2PB1asL5TAjpOeQuhd2sMBzkWFqjcKjKhcWlsp14Nx2RksBnqy/ceI3r+rpMTKf/INjzVxadIVip7K3oYK4JnuOXOESrzDy+8E3Eodu0hnhdLtOwB2nG/lLoFJxkOMH+gTCmGdLsxHh0BZOihSNGB3Q= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745391049; c=relaxed/simple; bh=eX5oXC+HBcw1mu0TCAHq5i0a+I/QmsXUI8/vYm8odp4=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=ib9HoV0rd9ftMXod+JGDMgXitb991fZifGOjUjc4QCyMbsIMvUOudIZ/UekJrvdRMiN4e0dpqibsFjpzEs1swR8A+QOMumtvoB5k5yfABzfIdvaRHDoHLVY5YD+JEPyGNR5DBZjbS6OFUgx+WFgIc15k5yCw+JLsleADB/tJHjM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de; spf=pass smtp.mailfrom=linutronix.de; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=fWFGa6B/; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=66lJ4fMn; arc=none smtp.client-ip=193.142.43.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="fWFGa6B/"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="66lJ4fMn" From: Nam Cao DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1745391040; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=GRN84yAGCbJ9jXd7YMFr0fN4dU5tvyZpKeky5D5bT9k=; b=fWFGa6B/J/hJ7ThfApnt5/XFzcFknjNvDhRv47jaGvXCeNSsS/ZCsw9slPqCZ42soxwCug /iO6yCxJCuOXOFAk8RYdGBmp6BIcMCU3Qd8CYtoKzv6lH8YsRx7Y60+AZp7uE5uiEzeKDt dmZFU1ndg3pt9CLkE6qSiNcdJL5cfkxJmEguLhf0pNakL1kBUS8gHDBj62wgjGWGz/AouB zHYE0pvK7/5wFvW41WlO38wNRu/zzbhlcbnBQ0qBBZFYsGh9t9+G2FhWQnjXHX6+i+GMuM Ax3fOiQgSOBy1TMV/z8qVkwnHYTRaXY39Cf7HM8gi/LF6jiu6JyBGB2Pp3DI3Q== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1745391040; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=GRN84yAGCbJ9jXd7YMFr0fN4dU5tvyZpKeky5D5bT9k=; b=66lJ4fMnVjS/5kJQh27nJyjJvPogmJXIyulDJU/ikxccrZ5i+hECSCawRsxVbnIzGb7IAj Hl4LG8qObw1Qe0DA== To: Steven Rostedt , Gabriele Monaco , linux-trace-kernel@vger.kernel.org, linux-kernel@vger.kernel.org Cc: john.ogness@linutronix.de, Nam Cao , Alexandre Ghiti , Paul Walmsley , Palmer Dabbelt , Albert Ou , linux-riscv@lists.infradead.org Subject: [PATCH v4 18/22] riscv: mm: Add page fault trace points Date: Wed, 23 Apr 2025 08:50:13 +0200 Message-Id: In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add page fault trace points, which are useful to implement RV monitor that watches page faults. Signed-off-by: Nam Cao Acked-by: Alexandre Ghiti --- Cc: Paul Walmsley Cc: Palmer Dabbelt Cc: Albert Ou Cc: linux-riscv@lists.infradead.org --- arch/riscv/mm/fault.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/arch/riscv/mm/fault.c b/arch/riscv/mm/fault.c index 0194324a0c50..04ed6f8acae4 100644 --- a/arch/riscv/mm/fault.c +++ b/arch/riscv/mm/fault.c @@ -20,6 +20,9 @@ #include #include =20 +#define CREATE_TRACE_POINTS +#include + #include "../kernel/head.h" =20 static void show_pte(unsigned long addr) @@ -291,6 +294,11 @@ void handle_page_fault(struct pt_regs *regs) if (kprobe_page_fault(regs, cause)) return; =20 + if (user_mode(regs)) + trace_page_fault_user(addr, regs, cause); + else + trace_page_fault_kernel(addr, regs, cause); + /* * Fault-in kernel-space virtual memory on-demand. * The 'reference' page table is init_mm.pgd. --=20 2.39.5 From nobody Thu Dec 18 04:57:59 2025 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 80A37269AE9; Wed, 23 Apr 2025 06:50:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745391051; cv=none; b=Tp5ukzh7UwcSi+pNT0Jmq2SUOJViiig3oS8zA1G6Z5cqJq2lG48Y27BTTzAfCXYo1BEWWzA32TkLZTV2cNr6ojK42whn9p8+7/zdLrtlh0j4p5VwmIvEP6nt7vfPy1XU5Z7Ltg7XY0M2MQZ1IUzczgdTZ4npgtaoGJP0zeb+w40= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745391051; c=relaxed/simple; bh=jYF4dWU1aEp8Ph3FkU7ROKkIdr8UtdpxnBzqMqTB99M=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=RFp4bImZYthcgY+6O2yi9F7YTuh/YqQCEcvzLaObfV5l+Ja2UFYDNRiGOysno1/q3t4HbAfSSo+w+XhvT2NZiIdBCjqZuXWAeSkwscUEXQMx4uNrD+STURlPr+Nf4hH9rTWUo26CwihPkkM3st1EZujyekznEzqbUrkmF7uqCn0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de; spf=pass smtp.mailfrom=linutronix.de; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=a3CUalUM; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=2mchAjBU; arc=none smtp.client-ip=193.142.43.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="a3CUalUM"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="2mchAjBU" From: Nam Cao DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1745391041; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=u+7taJ/J7sC2+IPIJiY4sU9NCe4nPoJ8DDsoghOFqBA=; b=a3CUalUMHw40thWK0eSXCCID/bcY8Lxjp7o6VrCecWIQlLOLfxH/bcyK3AK/i4V+8O1fny zBQp32EfL8f6UzP6gFxBKIeGfDGPy2zdxo6cF5IvGxDUwnX3BgOvN25m/PEu6IMDuFx7fD +059hmj/rBSJ0uyE6rUI8v+T+bvirpbJTvli/WWGoWBOINtziho5LQjWugoJHWWHuytstz Gpv4fv8BgJdZYslA0lK3gHMmbos9UBrtICbzrU4ZE6FZrckg/8YqA8jALFzG9qJjhyLWaR qZDPz3b2gE+bWKpfD7JZIwvyt+WVL+qT/gMuLY+xen5UM5lfKX2KAthCjjEI0Q== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1745391041; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=u+7taJ/J7sC2+IPIJiY4sU9NCe4nPoJ8DDsoghOFqBA=; b=2mchAjBUGCu9aeKbrbyX9UGAQQVhAt793+B2Qepl3WxI4XL9uqw4iV1h8B1tXQsiWbS3FO 9RyOZOazRimogdDw== To: Steven Rostedt , Gabriele Monaco , linux-trace-kernel@vger.kernel.org, linux-kernel@vger.kernel.org Cc: john.ogness@linutronix.de, Nam Cao Subject: [PATCH v4 19/22] rv: Add rtapp_pagefault monitor Date: Wed, 23 Apr 2025 08:50:14 +0200 Message-Id: <2eff7190ba245eb157f95ae461fef54183d07665.1745390829.git.namcao@linutronix.de> In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Userspace real-time applications may have design flaws that they raise page faults in real-time threads, and thus have unexpected latencies. Add an linear temporal logic monitor to detect this scenario. Signed-off-by: Nam Cao --- kernel/trace/rv/Kconfig | 1 + kernel/trace/rv/Makefile | 1 + kernel/trace/rv/monitors/pagefault/Kconfig | 11 +++ .../trace/rv/monitors/pagefault/pagefault.c | 82 +++++++++++++++++++ .../trace/rv/monitors/pagefault/pagefault.h | 57 +++++++++++++ .../rv/monitors/pagefault/pagefault_trace.h | 14 ++++ kernel/trace/rv/rv_trace.h | 1 + tools/verification/models/rtapp/pagefault.ltl | 1 + 8 files changed, 168 insertions(+) create mode 100644 kernel/trace/rv/monitors/pagefault/Kconfig create mode 100644 kernel/trace/rv/monitors/pagefault/pagefault.c create mode 100644 kernel/trace/rv/monitors/pagefault/pagefault.h create mode 100644 kernel/trace/rv/monitors/pagefault/pagefault_trace.h create mode 100644 tools/verification/models/rtapp/pagefault.ltl diff --git a/kernel/trace/rv/Kconfig b/kernel/trace/rv/Kconfig index 5c407d291661..6f86d8501e87 100644 --- a/kernel/trace/rv/Kconfig +++ b/kernel/trace/rv/Kconfig @@ -42,6 +42,7 @@ source "kernel/trace/rv/monitors/scpd/Kconfig" source "kernel/trace/rv/monitors/snep/Kconfig" source "kernel/trace/rv/monitors/sncid/Kconfig" source "kernel/trace/rv/monitors/rtapp/Kconfig" +source "kernel/trace/rv/monitors/pagefault/Kconfig" # Add new monitors here =20 config RV_REACTORS diff --git a/kernel/trace/rv/Makefile b/kernel/trace/rv/Makefile index 9b28c2419995..353ecf939d0e 100644 --- a/kernel/trace/rv/Makefile +++ b/kernel/trace/rv/Makefile @@ -13,6 +13,7 @@ obj-$(CONFIG_RV_MON_SCPD) +=3D monitors/scpd/scpd.o obj-$(CONFIG_RV_MON_SNEP) +=3D monitors/snep/snep.o obj-$(CONFIG_RV_MON_SNCID) +=3D monitors/sncid/sncid.o obj-$(CONFIG_RV_MON_RTAPP) +=3D monitors/rtapp/rtapp.o +obj-$(CONFIG_RV_MON_PAGEFAULT) +=3D monitors/pagefault/pagefault.o # Add new monitors here obj-$(CONFIG_RV_REACTORS) +=3D rv_reactors.o obj-$(CONFIG_RV_REACT_PRINTK) +=3D reactor_printk.o diff --git a/kernel/trace/rv/monitors/pagefault/Kconfig b/kernel/trace/rv/m= onitors/pagefault/Kconfig new file mode 100644 index 000000000000..b31dee208459 --- /dev/null +++ b/kernel/trace/rv/monitors/pagefault/Kconfig @@ -0,0 +1,11 @@ +# SPDX-License-Identifier: GPL-2.0-only +# +config RV_MON_PAGEFAULT + depends on RV + select RV_LTL_MONITOR + depends on RV_MON_RTAPP + default y + select LTL_MON_EVENTS_ID + bool "pagefault monitor" + help + Monitor that real-time tasks do not raise page faults diff --git a/kernel/trace/rv/monitors/pagefault/pagefault.c b/kernel/trace/= rv/monitors/pagefault/pagefault.c new file mode 100644 index 000000000000..ff7df49871b2 --- /dev/null +++ b/kernel/trace/rv/monitors/pagefault/pagefault.c @@ -0,0 +1,82 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define MODULE_NAME "pagefault" + +#include +#include +#include + +#include "pagefault.h" +#include + +static void ltl_atoms_fetch(struct task_struct *task, struct ltl_monitor *= mon) +{ + ltl_atom_set(mon, LTL_RT, rt_or_dl_task(task)); +} + +static void ltl_atoms_init(struct task_struct *task, struct ltl_monitor *m= on, bool task_creation) +{ + if (task_creation) + ltl_atom_set(mon, LTL_PAGEFAULT, false); +} + +static void handle_page_fault(void *data, unsigned long address, struct pt= _regs *regs, + unsigned long error_code) +{ + ltl_atom_pulse(current, LTL_PAGEFAULT, true); +} + +static int enable_pagefault(void) +{ + int retval; + + retval =3D ltl_monitor_init(); + if (retval) + return retval; + + rv_attach_trace_probe("rtapp_pagefault", page_fault_kernel, handle_page_f= ault); + rv_attach_trace_probe("rtapp_pagefault", page_fault_user, handle_page_fau= lt); + + return 0; +} + +static void disable_pagefault(void) +{ + rv_detach_trace_probe("rtapp_pagefault", page_fault_kernel, handle_page_f= ault); + rv_detach_trace_probe("rtapp_pagefault", page_fault_user, handle_page_fau= lt); + + ltl_monitor_destroy(); +} + +static struct rv_monitor rv_pagefault =3D { + .name =3D "pagefault", + .description =3D "Monitor that RT tasks do not raise page faults", + .enable =3D enable_pagefault, + .disable =3D disable_pagefault, +}; + +static int __init register_pagefault(void) +{ + return rv_register_monitor(&rv_pagefault, &rv_rtapp); +} + +static void __exit unregister_pagefault(void) +{ + rv_unregister_monitor(&rv_pagefault); +} + +module_init(register_pagefault); +module_exit(unregister_pagefault); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Nam Cao "); +MODULE_DESCRIPTION("pagefault: Monitor that RT tasks do not raise page fau= lts"); diff --git a/kernel/trace/rv/monitors/pagefault/pagefault.h b/kernel/trace/= rv/monitors/pagefault/pagefault.h new file mode 100644 index 000000000000..94c0fe4fdaa5 --- /dev/null +++ b/kernel/trace/rv/monitors/pagefault/pagefault.h @@ -0,0 +1,57 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +#include + +#define MONITOR_NAME pagefault + +enum ltl_atom { + LTL_PAGEFAULT, + LTL_RT, + LTL_NUM_ATOM +}; +static_assert(LTL_NUM_ATOM <=3D RV_MAX_LTL_ATOM); + +static const char *ltl_atom_str(enum ltl_atom atom) +{ + static const char *const names[] =3D { + "pa", + "rt", + }; + + return names[atom]; +} + +enum ltl_buchi_state { + S0, + RV_NUM_BA_STATES +}; +static_assert(RV_NUM_BA_STATES <=3D RV_MAX_BA_STATES); + +static void ltl_start(struct task_struct *task, struct ltl_monitor *mon) +{ + bool pagefault =3D test_bit(LTL_PAGEFAULT, mon->atoms); + bool val3 =3D !pagefault; + bool rt =3D test_bit(LTL_RT, mon->atoms); + bool val1 =3D !rt; + bool val4 =3D val1 || val3; + + if (val4) + __set_bit(S0, mon->states); +} + +static void +ltl_possible_next_states(struct ltl_monitor *mon, unsigned int state, unsi= gned long *next) +{ + bool pagefault =3D test_bit(LTL_PAGEFAULT, mon->atoms); + bool val3 =3D !pagefault; + bool rt =3D test_bit(LTL_RT, mon->atoms); + bool val1 =3D !rt; + bool val4 =3D val1 || val3; + + switch (state) { + case S0: + if (val4) + __set_bit(S0, next); + break; + } +} diff --git a/kernel/trace/rv/monitors/pagefault/pagefault_trace.h b/kernel/= trace/rv/monitors/pagefault/pagefault_trace.h new file mode 100644 index 000000000000..fe1f82597b1a --- /dev/null +++ b/kernel/trace/rv/monitors/pagefault/pagefault_trace.h @@ -0,0 +1,14 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +/* + * Snippet to be included in rv_trace.h + */ + +#ifdef CONFIG_RV_MON_PAGEFAULT +DEFINE_EVENT(event_ltl_monitor_id, event_pagefault, + TP_PROTO(struct task_struct *task, char *states, char *atoms, char *= next), + TP_ARGS(task, states, atoms, next)); +DEFINE_EVENT(error_ltl_monitor_id, error_pagefault, + TP_PROTO(struct task_struct *task), + TP_ARGS(task)); +#endif /* CONFIG_RV_MON_PAGEFAULT */ diff --git a/kernel/trace/rv/rv_trace.h b/kernel/trace/rv/rv_trace.h index f9fb848bae91..02c906c9745b 100644 --- a/kernel/trace/rv/rv_trace.h +++ b/kernel/trace/rv/rv_trace.h @@ -172,6 +172,7 @@ TRACE_EVENT(error_ltl_monitor_id, =20 TP_printk("%s[%d]: violation detected", __get_str(comm), __entry->pid) ); +#include // Add new monitors based on CONFIG_LTL_MON_EVENTS_ID here #endif /* CONFIG_LTL_MON_EVENTS_ID */ #endif /* _TRACE_RV_H */ diff --git a/tools/verification/models/rtapp/pagefault.ltl b/tools/verifica= tion/models/rtapp/pagefault.ltl new file mode 100644 index 000000000000..d7ce62102733 --- /dev/null +++ b/tools/verification/models/rtapp/pagefault.ltl @@ -0,0 +1 @@ +RULE =3D always (RT imply not PAGEFAULT) --=20 2.39.5 From nobody Thu Dec 18 04:57:59 2025 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6634E2676D1; 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dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=pCp8Wca2; arc=none smtp.client-ip=193.142.43.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="xi8+VOdB"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="pCp8Wca2" From: Nam Cao DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1745391041; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=/Llutf32SmyZ1q/a4+U4wdgR0MbgYXep3gUPR1k5eGQ=; b=xi8+VOdBIYesPV4kLpyoRPrjXqyrZteSoohjS6HK3ESPZykpqVs92d7vHROMUqh+9k+OjP 6kyTojgZn/oJvf9bcbF3m34pfOnVkEQ7nR6zT8v0zJ7Lu38GMmm2kG3952btSw3mOhOX9o YWQylCPXDAXwoBWKigcUVx2B3iwtyobA2GVbcLNtZmj/7cppGsgjbN1Eymua22LTjrOsCj nCXl9kNp5vR9I+DM0nyu3yl5xnfJkLGZaGeEA2qFzoI1yFg24Y7BgDDO1cXF1QJsrJMu2Q vGETLPomG2y5hjnWfQUG6dC+MZHhYbZ6n0qwT7qZZRoNw6FHPR0+o1CvV+frfQ== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1745391041; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=/Llutf32SmyZ1q/a4+U4wdgR0MbgYXep3gUPR1k5eGQ=; b=pCp8Wca2n7IfpgNF72KYRHhSlhKn5PzMMWRA8lRgZBK1lKO5ucFwYbeD7DXHjWgZz8W7QD Ggua7eZcj63IcrBg== To: Steven Rostedt , Gabriele Monaco , linux-trace-kernel@vger.kernel.org, linux-kernel@vger.kernel.org Cc: john.ogness@linutronix.de, Nam Cao Subject: [PATCH v4 20/22] rv: Add rtapp_sleep monitor Date: Wed, 23 Apr 2025 08:50:15 +0200 Message-Id: In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add a monitor for checking that real-time tasks do not go to sleep in a manner that may cause undesirable latency. Also change RV depends on TRACING to RV select TRACING to avoid the following recursive dependency: error: recursive dependency detected! symbol TRACING is selected by PREEMPTIRQ_TRACEPOINTS symbol PREEMPTIRQ_TRACEPOINTS depends on TRACE_IRQFLAGS symbol TRACE_IRQFLAGS is selected by RV_MON_SLEEP symbol RV_MON_SLEEP depends on RV symbol RV depends on TRACING Signed-off-by: Nam Cao --- kernel/trace/rv/Kconfig | 3 +- kernel/trace/rv/Makefile | 1 + kernel/trace/rv/monitors/sleep/Kconfig | 13 + kernel/trace/rv/monitors/sleep/sleep.c | 201 +++++++++++++ kernel/trace/rv/monitors/sleep/sleep.h | 287 +++++++++++++++++++ kernel/trace/rv/monitors/sleep/sleep_trace.h | 14 + kernel/trace/rv/rv_trace.h | 1 + tools/verification/models/rtapp/sleep.ltl | 15 + 8 files changed, 534 insertions(+), 1 deletion(-) create mode 100644 kernel/trace/rv/monitors/sleep/Kconfig create mode 100644 kernel/trace/rv/monitors/sleep/sleep.c create mode 100644 kernel/trace/rv/monitors/sleep/sleep.h create mode 100644 kernel/trace/rv/monitors/sleep/sleep_trace.h create mode 100644 tools/verification/models/rtapp/sleep.ltl diff --git a/kernel/trace/rv/Kconfig b/kernel/trace/rv/Kconfig index 6f86d8501e87..942d57575e67 100644 --- a/kernel/trace/rv/Kconfig +++ b/kernel/trace/rv/Kconfig @@ -20,7 +20,7 @@ config RV_LTL_MONITOR =20 menuconfig RV bool "Runtime Verification" - depends on TRACING + select TRACING help Enable the kernel runtime verification infrastructure. RV is a lightweight (yet rigorous) method that complements classical @@ -43,6 +43,7 @@ source "kernel/trace/rv/monitors/snep/Kconfig" source "kernel/trace/rv/monitors/sncid/Kconfig" source "kernel/trace/rv/monitors/rtapp/Kconfig" source "kernel/trace/rv/monitors/pagefault/Kconfig" +source "kernel/trace/rv/monitors/sleep/Kconfig" # Add new monitors here =20 config RV_REACTORS diff --git a/kernel/trace/rv/Makefile b/kernel/trace/rv/Makefile index 353ecf939d0e..13ec2944c665 100644 --- a/kernel/trace/rv/Makefile +++ b/kernel/trace/rv/Makefile @@ -14,6 +14,7 @@ obj-$(CONFIG_RV_MON_SNEP) +=3D monitors/snep/snep.o obj-$(CONFIG_RV_MON_SNCID) +=3D monitors/sncid/sncid.o obj-$(CONFIG_RV_MON_RTAPP) +=3D monitors/rtapp/rtapp.o obj-$(CONFIG_RV_MON_PAGEFAULT) +=3D monitors/pagefault/pagefault.o +obj-$(CONFIG_RV_MON_SLEEP) +=3D monitors/sleep/sleep.o # Add new monitors here obj-$(CONFIG_RV_REACTORS) +=3D rv_reactors.o obj-$(CONFIG_RV_REACT_PRINTK) +=3D reactor_printk.o diff --git a/kernel/trace/rv/monitors/sleep/Kconfig b/kernel/trace/rv/monit= ors/sleep/Kconfig new file mode 100644 index 000000000000..d00aa1aae069 --- /dev/null +++ b/kernel/trace/rv/monitors/sleep/Kconfig @@ -0,0 +1,13 @@ +# SPDX-License-Identifier: GPL-2.0-only +# +config RV_MON_SLEEP + depends on RV + select RV_LTL_MONITOR + depends on HAVE_SYSCALL_TRACEPOINTS + depends on RV_MON_RTAPP + select TRACE_IRQFLAGS + default y + select LTL_MON_EVENTS_ID + bool "sleep monitor" + help + Monitor that real-time tasks do not sleep in a manner that may cause un= desirable latency. diff --git a/kernel/trace/rv/monitors/sleep/sleep.c b/kernel/trace/rv/monit= ors/sleep/sleep.c new file mode 100644 index 000000000000..8907606a3a05 --- /dev/null +++ b/kernel/trace/rv/monitors/sleep/sleep.c @@ -0,0 +1,201 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define MODULE_NAME "sleep" + +#include +#include +#include +#include +#include +#include + +#include "sleep.h" +#include + +static void ltl_atoms_fetch(struct task_struct *task, struct ltl_monitor *= mon) +{ + ltl_atom_set(mon, LTL_RT, rt_or_dl_task(task)); +} + +static void ltl_atoms_init(struct task_struct *task, struct ltl_monitor *m= on, bool task_creation) +{ + /* event-like atomic propositions */ + ltl_atom_set(mon, LTL_SLEEP, false); + ltl_atom_set(mon, LTL_WAKE, false); + ltl_atom_set(mon, LTL_WOKEN_BY_HARDIRQ, false); + ltl_atom_set(mon, LTL_WOKEN_BY_NMI, false); + ltl_atom_set(mon, LTL_WOKEN_BY_EQUAL_OR_HIGHER_PRIO, false); + + if (task_creation) { + ltl_atom_set(mon, LTL_KTHREAD_SHOULD_STOP, false); + ltl_atom_set(mon, LTL_NANOSLEEP, false); + ltl_atom_set(mon, LTL_PI_FUTEX, false); + ltl_atom_set(mon, LTL_BLOCK_ON_RT_MUTEX, false); + } + + if (task->flags & PF_KTHREAD) { + ltl_atom_set(mon, LTL_KERNEL_THREAD, true); + + /* kernel tasks do not do syscall */ + ltl_atom_set(mon, LTL_PI_FUTEX, false); + ltl_atom_set(mon, LTL_NANOSLEEP, false); + + if (strstarts(task->comm, "migration/")) + ltl_atom_set(mon, LTL_TASK_IS_MIGRATION, true); + else + ltl_atom_set(mon, LTL_TASK_IS_MIGRATION, false); + + if (strstarts(task->comm, "rcu")) + ltl_atom_set(mon, LTL_TASK_IS_RCU, true); + else + ltl_atom_set(mon, LTL_TASK_IS_RCU, false); + } else { + ltl_atom_set(mon, LTL_KTHREAD_SHOULD_STOP, false); + ltl_atom_set(mon, LTL_KERNEL_THREAD, false); + ltl_atom_set(mon, LTL_TASK_IS_RCU, false); + ltl_atom_set(mon, LTL_TASK_IS_MIGRATION, false); + } + +} + +static void handle_sched_switch(void *data, bool preempt, struct task_stru= ct *prev, + struct task_struct *next, unsigned int prev_state) +{ + struct ltl_monitor *mon =3D ltl_get_monitor(next); + + if (prev_state & TASK_INTERRUPTIBLE) + ltl_atom_pulse(prev, LTL_SLEEP, true); + ltl_atom_set(mon, LTL_BLOCK_ON_RT_MUTEX, false); + ltl_atom_pulse(next, LTL_WAKE, true); +} + +static void handle_sched_waking(void *data, struct task_struct *task) +{ + if (this_cpu_read(hardirq_context)) { + ltl_atom_pulse(task, LTL_WOKEN_BY_HARDIRQ, true); + } else if (in_task()) { + if (current->prio <=3D task->prio) + ltl_atom_pulse(task, LTL_WOKEN_BY_EQUAL_OR_HIGHER_PRIO, true); + } else if (in_nmi()) { + ltl_atom_pulse(task, LTL_WOKEN_BY_NMI, true); + } +} + +static void handle_sched_pi_setprio(void *data, struct task_struct *task, + struct task_struct *pi_task) +{ + if (pi_task) + ltl_atom_update(pi_task, LTL_BLOCK_ON_RT_MUTEX, true); +} + +static void handle_sys_enter(void *data, struct pt_regs *regs, long id) +{ + struct ltl_monitor *mon; + unsigned long args[6]; + int op, cmd; + + mon =3D ltl_get_monitor(current); + + switch (id) { + case __NR_nanosleep: + case __NR_clock_nanosleep: +#ifdef __NR_clock_nanosleep_time64 + case __NR_clock_nanosleep_time64: +#endif + ltl_atom_update(current, LTL_NANOSLEEP, true); + break; + + case __NR_futex: +#ifdef __NR_futex_time64 + case __NR_futex_time64: +#endif + syscall_get_arguments(current, regs, args); + op =3D args[1]; + cmd =3D op & FUTEX_CMD_MASK; + + switch (cmd) { + case FUTEX_LOCK_PI: + case FUTEX_LOCK_PI2: + case FUTEX_WAIT_REQUEUE_PI: + ltl_atom_update(current, LTL_PI_FUTEX, true); + } + break; + } +} + +static void handle_sys_exit(void *data, struct pt_regs *regs, long ret) +{ + struct ltl_monitor *mon =3D ltl_get_monitor(current); + + ltl_atom_set(mon, LTL_PI_FUTEX, false); + ltl_atom_update(current, LTL_NANOSLEEP, false); +} + +static void handle_kthread_stop(void *data, struct task_struct *task) +{ + /* FIXME: this could race with other tracepoint handlers */ + ltl_atom_update(task, LTL_KTHREAD_SHOULD_STOP, true); +} + +static int enable_sleep(void) +{ + int retval; + + retval =3D ltl_monitor_init(); + if (retval) + return retval; + + rv_attach_trace_probe("rtapp_sleep", sched_waking, handle_sched_waking); + rv_attach_trace_probe("rtapp_sleep", sched_pi_setprio, handle_sched_pi_se= tprio); + rv_attach_trace_probe("rtapp_sleep", sched_switch, handle_sched_switch); + rv_attach_trace_probe("rtapp_sleep", sys_enter, handle_sys_enter); + rv_attach_trace_probe("rtapp_sleep", sys_exit, handle_sys_exit); + rv_attach_trace_probe("rtapp_sleep", sched_kthread_stop, handle_kthread_s= top); + return 0; +} + +static void disable_sleep(void) +{ + rv_detach_trace_probe("rtapp_sleep", sched_waking, handle_sched_waking); + rv_detach_trace_probe("rtapp_sleep", sched_pi_setprio, handle_sched_pi_se= tprio); + rv_detach_trace_probe("rtapp_sleep", sched_switch, handle_sched_switch); + rv_detach_trace_probe("rtapp_sleep", sys_enter, handle_sys_enter); + rv_detach_trace_probe("rtapp_sleep", sys_exit, handle_sys_exit); + rv_detach_trace_probe("rtapp_sleep", sched_kthread_stop, handle_kthread_s= top); + + ltl_monitor_destroy(); +} + +static struct rv_monitor rv_sleep =3D { + .name =3D "sleep", + .description =3D "Monitor that RT tasks do not undesirably sleep", + .enable =3D enable_sleep, + .disable =3D disable_sleep, +}; + +static int __init register_sleep(void) +{ + return rv_register_monitor(&rv_sleep, &rv_rtapp); +} + +static void __exit unregister_sleep(void) +{ + rv_unregister_monitor(&rv_sleep); +} + +module_init(register_sleep); +module_exit(unregister_sleep); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Nam Cao "); +MODULE_DESCRIPTION("sleep: Monitor that RT tasks do not undesirably sleep"= ); diff --git a/kernel/trace/rv/monitors/sleep/sleep.h b/kernel/trace/rv/monit= ors/sleep/sleep.h new file mode 100644 index 000000000000..3d2283644c9b --- /dev/null +++ b/kernel/trace/rv/monitors/sleep/sleep.h @@ -0,0 +1,287 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +#include + +#define MONITOR_NAME sleep + +enum ltl_atom { + LTL_BLOCK_ON_RT_MUTEX, + LTL_KERNEL_THREAD, + LTL_KTHREAD_SHOULD_STOP, + LTL_NANOSLEEP, + LTL_PI_FUTEX, + LTL_RT, + LTL_SLEEP, + LTL_TASK_IS_MIGRATION, + LTL_TASK_IS_RCU, + LTL_WAKE, + LTL_WOKEN_BY_EQUAL_OR_HIGHER_PRIO, + LTL_WOKEN_BY_HARDIRQ, + LTL_WOKEN_BY_NMI, + LTL_NUM_ATOM +}; +static_assert(LTL_NUM_ATOM <=3D RV_MAX_LTL_ATOM); + +static const char *ltl_atom_str(enum ltl_atom atom) +{ + static const char *const names[] =3D { + "bl_on_rt_mu", + "ker_th", + "kth_sh_st", + "na", + "pi_fu", + "rt", + "sl", + "ta_mi", + "ta_rc", + "wak", + "wo_eq_hi_pr", + "wo_ha", + "wo_nm", + }; + + return names[atom]; +} + +enum ltl_buchi_state { + S0, + S1, + S2, + S3, + S4, + S5, + S6, + S7, + S8, + S9, + S10, + RV_NUM_BA_STATES +}; +static_assert(RV_NUM_BA_STATES <=3D RV_MAX_BA_STATES); + +static void ltl_start(struct task_struct *task, struct ltl_monitor *mon) +{ + bool task_is_migration =3D test_bit(LTL_TASK_IS_MIGRATION, mon->atoms); + bool task_is_rcu =3D test_bit(LTL_TASK_IS_RCU, mon->atoms); + bool val30 =3D task_is_rcu || task_is_migration; + bool block_on_rt_mutex =3D test_bit(LTL_BLOCK_ON_RT_MUTEX, mon->atoms); + bool val4 =3D block_on_rt_mutex || val30; + bool kthread_should_stop =3D test_bit(LTL_KTHREAD_SHOULD_STOP, mon->atoms= ); + bool woken_by_nmi =3D test_bit(LTL_WOKEN_BY_NMI, mon->atoms); + bool val24 =3D woken_by_nmi || kthread_should_stop; + bool woken_by_hardirq =3D test_bit(LTL_WOKEN_BY_HARDIRQ, mon->atoms); + bool val25 =3D woken_by_hardirq || val24; + bool woken_by_equal_or_higher_prio =3D test_bit(LTL_WOKEN_BY_EQUAL_OR_HIG= HER_PRIO, + mon->atoms); + bool val14 =3D woken_by_equal_or_higher_prio || val25; + bool wake =3D test_bit(LTL_WAKE, mon->atoms); + bool val13 =3D !wake; + bool kernel_thread =3D test_bit(LTL_KERNEL_THREAD, mon->atoms); + bool nanosleep =3D test_bit(LTL_NANOSLEEP, mon->atoms); + bool pi_futex =3D test_bit(LTL_PI_FUTEX, mon->atoms); + bool val9 =3D pi_futex || nanosleep; + bool val11 =3D val9 || kernel_thread; + bool sleep =3D test_bit(LTL_SLEEP, mon->atoms); + bool val2 =3D !sleep; + bool rt =3D test_bit(LTL_RT, mon->atoms); + bool val1 =3D !rt; + + if (val1) + __set_bit(S0, mon->states); + if (val2) + __set_bit(S1, mon->states); + if (val11 && val13) + __set_bit(S2, mon->states); + if (val11 && val14) + __set_bit(S7, mon->states); + if (val4) + __set_bit(S8, mon->states); +} + +static void +ltl_possible_next_states(struct ltl_monitor *mon, unsigned int state, unsi= gned long *next) +{ + bool task_is_migration =3D test_bit(LTL_TASK_IS_MIGRATION, mon->atoms); + bool task_is_rcu =3D test_bit(LTL_TASK_IS_RCU, mon->atoms); + bool val30 =3D task_is_rcu || task_is_migration; + bool block_on_rt_mutex =3D test_bit(LTL_BLOCK_ON_RT_MUTEX, mon->atoms); + bool val4 =3D block_on_rt_mutex || val30; + bool kthread_should_stop =3D test_bit(LTL_KTHREAD_SHOULD_STOP, mon->atoms= ); + bool woken_by_nmi =3D test_bit(LTL_WOKEN_BY_NMI, mon->atoms); + bool val24 =3D woken_by_nmi || kthread_should_stop; + bool woken_by_hardirq =3D test_bit(LTL_WOKEN_BY_HARDIRQ, mon->atoms); + bool val25 =3D woken_by_hardirq || val24; + bool woken_by_equal_or_higher_prio =3D test_bit(LTL_WOKEN_BY_EQUAL_OR_HIG= HER_PRIO, + mon->atoms); + bool val14 =3D woken_by_equal_or_higher_prio || val25; + bool wake =3D test_bit(LTL_WAKE, mon->atoms); + bool val13 =3D !wake; + bool kernel_thread =3D test_bit(LTL_KERNEL_THREAD, mon->atoms); + bool nanosleep =3D test_bit(LTL_NANOSLEEP, mon->atoms); + bool pi_futex =3D test_bit(LTL_PI_FUTEX, mon->atoms); + bool val9 =3D pi_futex || nanosleep; + bool val11 =3D val9 || kernel_thread; + bool sleep =3D test_bit(LTL_SLEEP, mon->atoms); + bool val2 =3D !sleep; + bool rt =3D test_bit(LTL_RT, mon->atoms); + bool val1 =3D !rt; + + switch (state) { + case S0: + if (val1) + __set_bit(S0, next); + if (val2) + __set_bit(S1, next); + if (val11 && val13) + __set_bit(S2, next); + if (val11 && val14) + __set_bit(S7, next); + if (val4) + __set_bit(S8, next); + break; + case S1: + if (val1) + __set_bit(S0, next); + if (val2) + __set_bit(S1, next); + if (val11 && val13) + __set_bit(S2, next); + if (val11 && val14) + __set_bit(S7, next); + if (val4) + __set_bit(S8, next); + break; + case S2: + if (val11 && val13) + __set_bit(S2, next); + if (val1 && val13) + __set_bit(S3, next); + if (val13 && val2) + __set_bit(S4, next); + if (val13 && val4) + __set_bit(S5, next); + if (val1 && val14) + __set_bit(S6, next); + if (val11 && val14) + __set_bit(S7, next); + if (val14 && val2) + __set_bit(S9, next); + if (val14 && val4) + __set_bit(S10, next); + break; + case S3: + if (val11 && val13) + __set_bit(S2, next); + if (val1 && val13) + __set_bit(S3, next); + if (val13 && val2) + __set_bit(S4, next); + if (val13 && val4) + __set_bit(S5, next); + if (val1 && val14) + __set_bit(S6, next); + if (val11 && val14) + __set_bit(S7, next); + if (val14 && val2) + __set_bit(S9, next); + if (val14 && val4) + __set_bit(S10, next); + break; + case S4: + if (val11 && val13) + __set_bit(S2, next); + if (val1 && val13) + __set_bit(S3, next); + if (val13 && val2) + __set_bit(S4, next); + if (val13 && val4) + __set_bit(S5, next); + if (val1 && val14) + __set_bit(S6, next); + if (val11 && val14) + __set_bit(S7, next); + if (val14 && val2) + __set_bit(S9, next); + if (val14 && val4) + __set_bit(S10, next); + break; + case S5: + if (val11 && val13) + __set_bit(S2, next); + if (val1 && val13) + __set_bit(S3, next); + if (val13 && val2) + __set_bit(S4, next); + if (val13 && val4) + __set_bit(S5, next); + if (val1 && val14) + __set_bit(S6, next); + if (val11 && val14) + __set_bit(S7, next); + if (val14 && val2) + __set_bit(S9, next); + if (val14 && val4) + __set_bit(S10, next); + break; + case S6: + if (val1) + __set_bit(S0, next); + if (val2) + __set_bit(S1, next); + if (val11 && val13) + __set_bit(S2, next); + if (val11 && val14) + __set_bit(S7, next); + if (val4) + __set_bit(S8, next); + break; + case S7: + if (val1) + __set_bit(S0, next); + if (val2) + __set_bit(S1, next); + if (val11 && val13) + __set_bit(S2, next); + if (val11 && val14) + __set_bit(S7, next); + if (val4) + __set_bit(S8, next); + break; + case S8: + if (val1) + __set_bit(S0, next); + if (val2) + __set_bit(S1, next); + if (val11 && val13) + __set_bit(S2, next); + if (val11 && val14) + __set_bit(S7, next); + if (val4) + __set_bit(S8, next); + break; + case S9: + if (val1) + __set_bit(S0, next); + if (val2) + __set_bit(S1, next); + if (val11 && val13) + __set_bit(S2, next); + if (val11 && val14) + __set_bit(S7, next); + if (val4) + __set_bit(S8, next); + break; + case S10: + if (val1) + __set_bit(S0, next); + if (val2) + __set_bit(S1, next); + if (val11 && val13) + __set_bit(S2, next); + if (val11 && val14) + __set_bit(S7, next); + if (val4) + __set_bit(S8, next); + break; + } +} diff --git a/kernel/trace/rv/monitors/sleep/sleep_trace.h b/kernel/trace/rv= /monitors/sleep/sleep_trace.h new file mode 100644 index 000000000000..22eaf31da987 --- /dev/null +++ b/kernel/trace/rv/monitors/sleep/sleep_trace.h @@ -0,0 +1,14 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +/* + * Snippet to be included in rv_trace.h + */ + +#ifdef CONFIG_RV_MON_SLEEP +DEFINE_EVENT(event_ltl_monitor_id, event_sleep, + TP_PROTO(struct task_struct *task, char *states, char *atoms, char *= next), + TP_ARGS(task, states, atoms, next)); +DEFINE_EVENT(error_ltl_monitor_id, error_sleep, + TP_PROTO(struct task_struct *task), + TP_ARGS(task)); +#endif /* CONFIG_RV_MON_SLEEP */ diff --git a/kernel/trace/rv/rv_trace.h b/kernel/trace/rv/rv_trace.h index 02c906c9745b..283d5c2fd055 100644 --- a/kernel/trace/rv/rv_trace.h +++ b/kernel/trace/rv/rv_trace.h @@ -173,6 +173,7 @@ TRACE_EVENT(error_ltl_monitor_id, TP_printk("%s[%d]: violation detected", __get_str(comm), __entry->pid) ); #include +#include // Add new monitors based on CONFIG_LTL_MON_EVENTS_ID here #endif /* CONFIG_LTL_MON_EVENTS_ID */ #endif /* _TRACE_RV_H */ diff --git a/tools/verification/models/rtapp/sleep.ltl b/tools/verification= /models/rtapp/sleep.ltl new file mode 100644 index 000000000000..416ace2da0f2 --- /dev/null +++ b/tools/verification/models/rtapp/sleep.ltl @@ -0,0 +1,15 @@ +RULE =3D always (RT imply (SLEEP imply (RT_FRIENDLY_SLEEP or ALLOWLIST))) + +RT_FRIENDLY_SLEEP =3D (RT_VALID_SLEEP_REASON or KERNEL_THREAD) + and ((not WAKE) until RT_FRIENDLY_WAKE) + +RT_VALID_SLEEP_REASON =3D PI_FUTEX or NANOSLEEP + +RT_FRIENDLY_WAKE =3D WOKEN_BY_EQUAL_OR_HIGHER_PRIO + or WOKEN_BY_HARDIRQ + or WOKEN_BY_NMI + or KTHREAD_SHOULD_STOP + +ALLOWLIST =3D BLOCK_ON_RT_MUTEX + or TASK_IS_RCU + or TASK_IS_MIGRATION --=20 2.39.5 From nobody Thu Dec 18 04:57:59 2025 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 83214269AF3; 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Reviewed-by: Gabriele Monaco Signed-off-by: Nam Cao --- Documentation/trace/rv/index.rst | 1 + Documentation/trace/rv/monitor_rtapp.rst | 107 +++++++++++++++++++++++ 2 files changed, 108 insertions(+) create mode 100644 Documentation/trace/rv/monitor_rtapp.rst diff --git a/Documentation/trace/rv/index.rst b/Documentation/trace/rv/inde= x.rst index 2a27f6bc9429..a2812ac5cfeb 100644 --- a/Documentation/trace/rv/index.rst +++ b/Documentation/trace/rv/index.rst @@ -14,3 +14,4 @@ Runtime Verification monitor_wip.rst monitor_wwnr.rst monitor_sched.rst + monitor_rtapp.rst diff --git a/Documentation/trace/rv/monitor_rtapp.rst b/Documentation/trace= /rv/monitor_rtapp.rst new file mode 100644 index 000000000000..3d90f8f3bc9e --- /dev/null +++ b/Documentation/trace/rv/monitor_rtapp.rst @@ -0,0 +1,107 @@ +Real-time application monitors +=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D + +- Name: rtapp +- Type: container for multiple monitors +- Author: Nam Cao + +Description +----------- + +Real-time applications may have design flaws such that they experience une= xpected latency and fail +to meet their time requirements. Often, these flaws follow a few patterns: + + - Page faults: A real-time thread may access memory that does not have a= mapped physical backing + or must first be copied (such as for copy-on-write). Thus a page fault= is raised and the kernel + must first perform the expensive action. This causes significant delay= s to the real-time thread + - Priority inversion: A real-time thread blocks waiting for a lower-prio= rity thread. This causes + the real-time thread to effectively take on the scheduling priority of= the lower-priority + thread. For example, the real-time thread needs to access a shared res= ource that is protected by + a non-pi-mutex, but the mutex is currently owned by a non-real-time th= read. + +The `rtapp` monitor detects these patterns. It aids developers to identify= reasons for unexpected +latency with real-time applications. It is a container of multiple sub-mon= itors described in the +following sections. + +Monitor pagefault ++++++++++++++++++ + +The `pagefault` monitor reports real-time tasks raising page faults. Its s= pecification is:: + + RULE =3D always (RT imply not PAGEFAULT) + +To fix warnings reported by this monitor, `mlockall()` or `mlock()` can be= used to ensure physical +backing for memory. + +This monitor may have false negatives because the pages used by the real-t= ime threads may just +happen to be directly available during testing. To minimize this, the syst= em can be put under memory +pressure (e.g. invoking the OOM killer using a program that does `ptr =3D = malloc(SIZE_OF_RAM); +memset(ptr, 0, SIZE_OF_RAM);`) so that the kernel executes aggressive stra= tegies to recycle as much +physical memory as possible. + +Monitor sleep ++++++++++++++ + +The `sleep` monitor reports real-time threads sleeping in a manner that ma= y cause undesirable +latency. Real-time applications should only put a real-time thread to slee= p for one of the following +reasons: + + - Cyclic work: real-time thread sleeps waiting for the next cycle. For t= his case, only the + `nanosleep` syscall should be used. No other method is safe for real-t= ime. For example, threads + waiting for timerfd can be woken by softirq which provides no real-tim= e guarantee. + - Real-time thread waiting for something to happen (e.g. another thread = releasing shared + resources, or a completion signal from another thread). In this case, = only futexes with priority + inheritance (PI) should be used. Applications usually do not use futex= es directly, but use PI + mutexes and PI condition variables which are built on top of futexes. = Be aware that the C + library might not implement conditional variables as safe for real-tim= e. As an alternative, the + librtpi library exists to provide a conditional variable implementatio= n that is correct for + real-time applications in Linux. + +Beside the reason for sleeping, the eventual waker should also be real-tim= e-safe. Namely, one of: + + - An equal-or-higher-priority thread + - Hard interrupt handler + - Non-maskable interrupt handler + +This monitor's warning usually means one of the following: + + - Real-time thread is blocked by a non-real-time thread (e.g. due to con= tention on a mutex without + priority inheritance). This is priority inversion. + - Time-critical work waits for something which is not safe for real-time= (e.g. timerfd). + - The work executed by the real-time thread does not need to run at real= -time priority at all. + This is not a problem for the real-time thread itself, but it is poten= tially taking the CPU away + from other important real-time work. + +Application developers may purposely choose to have their real-time applic= ation sleep in a way that +is not safe for real-time. It is debatable whether that is a problem. Appl= ication developers must +analyze the warnings to make a proper assessment. + +The monitor's specification is:: + + RULE =3D always (RT imply (SLEEP imply (RT_FRIENDLY_SLEEP or ALLOWLIST))) + + RT_FRIENDLY_SLEEP =3D (RT_VALID_SLEEP_REASON or KERNEL_THREAD) + and ((not WAKE) until RT_FRIENDLY_WAKE) + + RT_VALID_SLEEP_REASON =3D PI_FUTEX or NANOSLEEP + + RT_FRIENDLY_WAKE =3D WOKEN_BY_EQUAL_OR_HIGHER_PRIO + or WOKEN_BY_HARDIRQ + or WOKEN_BY_NMI + or KTHREAD_SHOULD_STOP + + ALLOWLIST =3D BLOCK_ON_RT_MUTEX + or TASK_IS_RCU + or TASK_IS_MIGRATION + +Beside the scenarios described above, this specification also handle some = special cases: + + - `KERNEL_THREAD`: kernel tasks do not have any pattern that can be reco= gnized as valid real-time + sleeping reasons. Therefore sleeping reason is not checked for kernel = tasks. + - `KTHREAD_SHOULD_STOP`: a non-real-time thread may stop a real-time ker= nel thread by waking it + and waiting for it to exit (`kthread_stop()`). This wakeup is safe for= real-time. + - `ALLOWLIST`: to handle known false positives with the kernel. + - `BLOCK_ON_RT_MUTEX` is included in the allowlist due to its implementa= tion. In the release path + of rt_mutex, a boosted task is de-boosted before waking the rt_mutex's= waiter. Consequently, the + monitor may see a real-time-unsafe wakeup (e.g. non-real-time task wak= ing real-time task). This + is actually real-time-safe because preemption is disabled for the dura= tion. --=20 2.39.5 From nobody Thu Dec 18 04:57:59 2025 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 83340269AF9; Wed, 23 Apr 2025 06:50:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745391050; cv=none; b=EuOAH8Ehj2YGjaqMWOxVd7k4bqXiANMINHo6c936paWosAu5Q+RBICPAXy5/Upa7DbH3vEgTq8TTZmEBCMKyDB8lMo+NMePpo042gJ4fACshtFGoMXE6GZ883urYj49rA9bcDYdT4SGiOI4OqE9INeS2gtP5Pq+RVM/49NvU48A= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745391050; c=relaxed/simple; bh=l0l5nu8kjh36e//5AZAMxsFhAqbiHcrhJ8w4MU7glLY=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=Is9K0VxK+fePv0kxvC/0FZnk7enjByqtafeJddp6jsamezFZYgARqvsi/dUAm+ppyywoFmIL4GeTXENeV8PZ1fUUHMBWeQ2lpdJnZtv5t0RUkT+hD7Sc+R23qGm/i7ZgB3qvj3wj4vaDN16AJXVGKEsWnul0hxCefuErvrTHsJw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de; spf=pass smtp.mailfrom=linutronix.de; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=Cjym+OdG; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=Nzk/RtxS; arc=none smtp.client-ip=193.142.43.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="Cjym+OdG"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="Nzk/RtxS" From: Nam Cao DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1745391042; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=nmxRsKAqM1+s9Ie1IxBxzQWx8Fn4Xqe0sRiBYYmgM5E=; b=Cjym+OdGotGMrFn5+xOzq28wuizYOf4OUKSjNB4sXhoUL6kNM+rMAZKa2npuPzr+n5il+5 m6M/IDzVy6HHPBPASEX7xRtAS3H3u/RTj1C1C2EO/S9mG990Dxi2QtGeNDgNTTjD1xy2Ew 2gRO9+sCGXNATgkH+hfXTSvqOpDDdE3YKdEh9sI25vKEfjZjNsSVVzrgo+op/qarZaaedL Iv6DC/ir0kfz4Uo7osva7UrHeMTZadlhQ5n1YW5FmdEFxxvw/jO2tR+7qLB0tN2/uH6At3 ZqErjbHBRHO/ZaKtTKSQQkje5E6GllPQo3HdXi/n5o/BEut1NMCn6DzNdCx8Rw== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1745391042; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=nmxRsKAqM1+s9Ie1IxBxzQWx8Fn4Xqe0sRiBYYmgM5E=; b=Nzk/RtxSn0TUJo+k1gY5Hms7Sox3vLoZFMTnKMN/rBNnOlJHelvC1/icnTscuAYrkHp6E+ HVitHDAFBfucJQDw== To: Steven Rostedt , Gabriele Monaco , linux-trace-kernel@vger.kernel.org, linux-kernel@vger.kernel.org Cc: john.ogness@linutronix.de, Nam Cao Subject: [PATCH v4 22/22] rv: Allow to configure the number of per-task monitor Date: Wed, 23 Apr 2025 08:50:17 +0200 Message-Id: In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Now that there are 2 monitors for real-time applications, users may want to enable both of them simultaneously. Make the number of per-task monitor configurable. Default it to 2 for now. Reviewed-by: Gabriele Monaco Signed-off-by: Nam Cao --- include/linux/rv.h | 9 +-------- include/linux/sched.h | 8 +++----- kernel/trace/rv/Kconfig | 9 +++++++++ kernel/trace/rv/monitors/rtapp/Kconfig | 1 + kernel/trace/rv/rv.c | 8 ++++---- 5 files changed, 18 insertions(+), 17 deletions(-) diff --git a/include/linux/rv.h b/include/linux/rv.h index 2897aad16883..099b23c14e54 100644 --- a/include/linux/rv.h +++ b/include/linux/rv.h @@ -74,14 +74,7 @@ struct ltl_monitor {}; =20 #endif /* CONFIG_RV_LTL_MONITOR */ =20 -/* - * Per-task RV monitors count. Nowadays fixed in RV_PER_TASK_MONITORS. - * If we find justification for more monitors, we can think about - * adding more or developing a dynamic method. So far, none of - * these are justified. - */ -#define RV_PER_TASK_MONITORS 1 -#define RV_PER_TASK_MONITOR_INIT (RV_PER_TASK_MONITORS) +#define RV_PER_TASK_MONITOR_INIT (CONFIG_RV_PER_TASK_MONITORS) =20 union rv_task_monitor { struct da_monitor da_mon; diff --git a/include/linux/sched.h b/include/linux/sched.h index 45be0fa7a5cc..560782493292 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -1623,12 +1623,10 @@ struct task_struct { =20 #ifdef CONFIG_RV /* - * Per-task RV monitor. Nowadays fixed in RV_PER_TASK_MONITORS. - * If we find justification for more monitors, we can think - * about adding more or developing a dynamic method. So far, - * none of these are justified. + * Per-task RV monitor, fixed in CONFIG_RV_PER_TASK_MONITORS. + * If memory becomes a concern, we can think about a dynamic method. */ - union rv_task_monitor rv[RV_PER_TASK_MONITORS]; + union rv_task_monitor rv[CONFIG_RV_PER_TASK_MONITORS]; #endif =20 #ifdef CONFIG_USER_EVENTS diff --git a/kernel/trace/rv/Kconfig b/kernel/trace/rv/Kconfig index 942d57575e67..c11bf7e61ebf 100644 --- a/kernel/trace/rv/Kconfig +++ b/kernel/trace/rv/Kconfig @@ -32,6 +32,15 @@ menuconfig RV For further information, see: Documentation/trace/rv/runtime-verification.rst =20 +config RV_PER_TASK_MONITORS + int "Maximum number of per-task monitor" + depends on RV + range 1 8 + default 2 + help + This option configures the maximum number of per-task RV monitors that = can run + simultaneously. + source "kernel/trace/rv/monitors/wip/Kconfig" source "kernel/trace/rv/monitors/wwnr/Kconfig" source "kernel/trace/rv/monitors/sched/Kconfig" diff --git a/kernel/trace/rv/monitors/rtapp/Kconfig b/kernel/trace/rv/monit= ors/rtapp/Kconfig index 94689d66a79c..6a521c95a03f 100644 --- a/kernel/trace/rv/monitors/rtapp/Kconfig +++ b/kernel/trace/rv/monitors/rtapp/Kconfig @@ -1,5 +1,6 @@ config RV_MON_RTAPP depends on RV + depends on RV_PER_TASK_MONITORS >=3D 2 bool "rtapp monitor" help Collection of monitors to check for common problems with real-time appl= ication that cause diff --git a/kernel/trace/rv/rv.c b/kernel/trace/rv/rv.c index dae84deb327d..a1b6b3c39eff 100644 --- a/kernel/trace/rv/rv.c +++ b/kernel/trace/rv/rv.c @@ -165,7 +165,7 @@ struct dentry *get_monitors_root(void) LIST_HEAD(rv_monitors_list); =20 static int task_monitor_count; -static bool task_monitor_slots[RV_PER_TASK_MONITORS]; +static bool task_monitor_slots[CONFIG_RV_PER_TASK_MONITORS]; =20 int rv_get_task_monitor_slot(void) { @@ -173,12 +173,12 @@ int rv_get_task_monitor_slot(void) =20 lockdep_assert_held(&rv_interface_lock); =20 - if (task_monitor_count =3D=3D RV_PER_TASK_MONITORS) + if (task_monitor_count =3D=3D CONFIG_RV_PER_TASK_MONITORS) return -EBUSY; =20 task_monitor_count++; =20 - for (i =3D 0; i < RV_PER_TASK_MONITORS; i++) { + for (i =3D 0; i < CONFIG_RV_PER_TASK_MONITORS; i++) { if (task_monitor_slots[i] =3D=3D false) { task_monitor_slots[i] =3D true; return i; @@ -194,7 +194,7 @@ void rv_put_task_monitor_slot(int slot) { lockdep_assert_held(&rv_interface_lock); =20 - if (slot < 0 || slot >=3D RV_PER_TASK_MONITORS) { + if (slot < 0 || slot >=3D CONFIG_RV_PER_TASK_MONITORS) { WARN_ONCE(1, "RV releasing an invalid slot!: %d\n", slot); return; } --=20 2.39.5