From nobody Mon Nov 25 15:15:55 2024 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 B79C55C603; Sun, 10 Nov 2024 15:49:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731253777; cv=none; b=hBKv9Gm8IhTjtfRUqUZvsWOFhMd0CwuEYlV0IIKu3kAyPAu3RdAzC2cFG6jdo75RlqHsVPtwAPGux6+e7wZzl5PWVfEdbO1/z8AHVRT+LlbbcohqJw9byz6zA8eDSAeQOUueMDwRfRZIVIO4PKCvDOXdhhjzQYENHkMUD+NwX+c= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731253777; c=relaxed/simple; bh=0guW880MFdqcOEZZF4PeBunb0D0It/NmNJp3VWvlvwg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=RZ8tSf2ZAMsSVZ/4YwGEe8WofYO5dBd6lXAETpcmDjgbj3d+OMZxjUimn2ssDn/w/ap7+d9AGU6P0STnGrhe8fC5KxlLQYJaD87u+4SrPc1gbFEvKHJdsBrsASNZ4Y+/NIQuWa/JvNpRsRV7jHZVTFPC0xZiutNfFwNnL/o56w8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=icshDaSU; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="icshDaSU" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9AA80C4CECD; Sun, 10 Nov 2024 15:49:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1731253777; bh=0guW880MFdqcOEZZF4PeBunb0D0It/NmNJp3VWvlvwg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=icshDaSUcbF8Lpf4YgZCjnz0mVInN4a3mq+VjkB0TPn5D8QW+gdL3i9zdt8/I6lbM we9v2/J2a8+rzNFjWe3csG9mglBb/4dujaQgi9n8xqF3ywK1o9jWlKbZ6/aiQwMFHe JKt+1a1Jf2Zy9219i5z/R3Rl10RhgrlR95xRFNHVP6ziQNkuioSIkT4RI8v92g5umb F7S5yLfBiajLXTLdlReV2JCB22DaGy6eBUqbHsBYCiThhdBtZLicsgb+vUwv84GHUj 84SGHWWOn+iULSiOMPw4a5M42oGPi9HBXgQkRTySqP441NHQHgsX0QZZpC7QTYRPmt iApFKn4J9SQLQ== From: "Masami Hiramatsu (Google)" To: Alexei Starovoitov , Steven Rostedt , Florent Revest Cc: linux-trace-kernel@vger.kernel.org, LKML , Martin KaFai Lau , bpf , Alexei Starovoitov , Jiri Olsa , Alan Maguire , Mark Rutland , linux-arch@vger.kernel.org Subject: [PATCH v19 04/19] fprobe: Use ftrace_regs in fprobe entry handler Date: Mon, 11 Nov 2024 00:49:32 +0900 Message-ID: <173125377212.172790.1184199226080903806.stgit@devnote2> X-Mailer: git-send-email 2.43.0 In-Reply-To: <173125372214.172790.6929368952404083802.stgit@devnote2> References: <173125372214.172790.6929368952404083802.stgit@devnote2> User-Agent: StGit/0.19 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable From: Masami Hiramatsu (Google) This allows fprobes to be available with CONFIG_DYNAMIC_FTRACE_WITH_ARGS instead of CONFIG_DYNAMIC_FTRACE_WITH_REGS, then we can enable fprobe on arm64. Signed-off-by: Masami Hiramatsu (Google) Acked-by: Florent Revest --- Changes in v6: - Keep using SAVE_REGS flag to avoid breaking bpf kprobe-multi test. --- include/linux/fprobe.h | 2 +- kernel/trace/Kconfig | 3 ++- kernel/trace/bpf_trace.c | 10 +++++++--- kernel/trace/fprobe.c | 3 ++- kernel/trace/trace_fprobe.c | 6 +++++- lib/test_fprobe.c | 4 ++-- samples/fprobe/fprobe_example.c | 2 +- 7 files changed, 20 insertions(+), 10 deletions(-) diff --git a/include/linux/fprobe.h b/include/linux/fprobe.h index f39869588117..ca64ee5e45d2 100644 --- a/include/linux/fprobe.h +++ b/include/linux/fprobe.h @@ -10,7 +10,7 @@ struct fprobe; =20 typedef int (*fprobe_entry_cb)(struct fprobe *fp, unsigned long entry_ip, - unsigned long ret_ip, struct pt_regs *regs, + unsigned long ret_ip, struct ftrace_regs *regs, void *entry_data); =20 typedef void (*fprobe_exit_cb)(struct fprobe *fp, unsigned long entry_ip, diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig index c5ab2a561272..f10ca86fbfad 100644 --- a/kernel/trace/Kconfig +++ b/kernel/trace/Kconfig @@ -297,7 +297,7 @@ config DYNAMIC_FTRACE_WITH_ARGS config FPROBE bool "Kernel Function Probe (fprobe)" depends on FUNCTION_TRACER - depends on DYNAMIC_FTRACE_WITH_REGS + depends on DYNAMIC_FTRACE_WITH_REGS || DYNAMIC_FTRACE_WITH_ARGS depends on HAVE_RETHOOK select RETHOOK default n @@ -682,6 +682,7 @@ config FPROBE_EVENTS select TRACING select PROBE_EVENTS select DYNAMIC_EVENTS + depends on DYNAMIC_FTRACE_WITH_REGS default y help This allows user to add tracing events on the function entry and diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c index 3bd402fa62a4..09fb6ce92144 100644 --- a/kernel/trace/bpf_trace.c +++ b/kernel/trace/bpf_trace.c @@ -2517,7 +2517,7 @@ struct bpf_session_run_ctx { void *data; }; =20 -#ifdef CONFIG_FPROBE +#if defined(CONFIG_FPROBE) && defined(CONFIG_DYNAMIC_FTRACE_WITH_REGS) struct bpf_kprobe_multi_link { struct bpf_link link; struct fprobe fp; @@ -2769,12 +2769,16 @@ kprobe_multi_link_prog_run(struct bpf_kprobe_multi_= link *link, =20 static int kprobe_multi_link_handler(struct fprobe *fp, unsigned long fentry_ip, - unsigned long ret_ip, struct pt_regs *regs, + unsigned long ret_ip, struct ftrace_regs *fregs, void *data) { + struct pt_regs *regs =3D ftrace_get_regs(fregs); struct bpf_kprobe_multi_link *link; int err; =20 + if (!regs) + return 0; + link =3D container_of(fp, struct bpf_kprobe_multi_link, fp); err =3D kprobe_multi_link_prog_run(link, get_entry_ip(fentry_ip), regs, f= alse, data); return is_kprobe_session(link->link.prog) ? err : 0; @@ -3049,7 +3053,7 @@ int bpf_kprobe_multi_link_attach(const union bpf_attr= *attr, struct bpf_prog *pr kvfree(cookies); return err; } -#else /* !CONFIG_FPROBE */ +#else /* !CONFIG_FPROBE || !CONFIG_DYNAMIC_FTRACE_WITH_REGS */ int bpf_kprobe_multi_link_attach(const union bpf_attr *attr, struct bpf_pr= og *prog) { return -EOPNOTSUPP; diff --git a/kernel/trace/fprobe.c b/kernel/trace/fprobe.c index 9ff018245840..3d3789283873 100644 --- a/kernel/trace/fprobe.c +++ b/kernel/trace/fprobe.c @@ -46,7 +46,7 @@ static inline void __fprobe_handler(unsigned long ip, uns= igned long parent_ip, } =20 if (fp->entry_handler) - ret =3D fp->entry_handler(fp, ip, parent_ip, ftrace_get_regs(fregs), ent= ry_data); + ret =3D fp->entry_handler(fp, ip, parent_ip, fregs, entry_data); =20 /* If entry_handler returns !0, nmissed is not counted. */ if (rh) { @@ -182,6 +182,7 @@ static void fprobe_init(struct fprobe *fp) fp->ops.func =3D fprobe_kprobe_handler; else fp->ops.func =3D fprobe_handler; + fp->ops.flags |=3D FTRACE_OPS_FL_SAVE_REGS; } =20 diff --git a/kernel/trace/trace_fprobe.c b/kernel/trace/trace_fprobe.c index a079abd8955b..f73b78187389 100644 --- a/kernel/trace/trace_fprobe.c +++ b/kernel/trace/trace_fprobe.c @@ -339,12 +339,16 @@ NOKPROBE_SYMBOL(fexit_perf_func); #endif /* CONFIG_PERF_EVENTS */ =20 static int fentry_dispatcher(struct fprobe *fp, unsigned long entry_ip, - unsigned long ret_ip, struct pt_regs *regs, + unsigned long ret_ip, struct ftrace_regs *fregs, void *entry_data) { struct trace_fprobe *tf =3D container_of(fp, struct trace_fprobe, fp); + struct pt_regs *regs =3D ftrace_get_regs(fregs); int ret =3D 0; =20 + if (!regs) + return 0; + if (trace_probe_test_flag(&tf->tp, TP_FLAG_TRACE)) fentry_trace_func(tf, entry_ip, regs); #ifdef CONFIG_PERF_EVENTS diff --git a/lib/test_fprobe.c b/lib/test_fprobe.c index 24de0e5ff859..ff607babba18 100644 --- a/lib/test_fprobe.c +++ b/lib/test_fprobe.c @@ -40,7 +40,7 @@ static noinline u32 fprobe_selftest_nest_target(u32 value= , u32 (*nest)(u32)) =20 static notrace int fp_entry_handler(struct fprobe *fp, unsigned long ip, unsigned long ret_ip, - struct pt_regs *regs, void *data) + struct ftrace_regs *fregs, void *data) { KUNIT_EXPECT_FALSE(current_test, preemptible()); /* This can be called on the fprobe_selftest_target and the fprobe_selfte= st_target2 */ @@ -81,7 +81,7 @@ static notrace void fp_exit_handler(struct fprobe *fp, un= signed long ip, =20 static notrace int nest_entry_handler(struct fprobe *fp, unsigned long ip, unsigned long ret_ip, - struct pt_regs *regs, void *data) + struct ftrace_regs *fregs, void *data) { KUNIT_EXPECT_FALSE(current_test, preemptible()); return 0; diff --git a/samples/fprobe/fprobe_example.c b/samples/fprobe/fprobe_exampl= e.c index 0a50b05add96..c234afae52d6 100644 --- a/samples/fprobe/fprobe_example.c +++ b/samples/fprobe/fprobe_example.c @@ -50,7 +50,7 @@ static void show_backtrace(void) =20 static int sample_entry_handler(struct fprobe *fp, unsigned long ip, unsigned long ret_ip, - struct pt_regs *regs, void *data) + struct ftrace_regs *fregs, void *data) { if (use_trace) /*