From nobody Thu Apr 2 17:23:46 2026 Received: from mail-ed1-f73.google.com (mail-ed1-f73.google.com [209.85.208.73]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9BFAD3E9F81 for ; Mon, 9 Mar 2026 16:26:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.208.73 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773073574; cv=none; b=iHJV8Sdflu6UoLPugiQhgIYTnQwxTyGvJeCVE6oEZ51Mzt4eYW+MN7i2KzhOYH3lX9woHet4C0IEZgOZEN8NiaYzO4S6drGc6DJe8YjeMlUQidKoAJMyPTyWmtvqLmRD+ZeJNXF54DizEURKPCst6DAMXca3IvZgS7PK/E44OmE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773073574; c=relaxed/simple; bh=JwsRGkcOcaoB6c3jYX0g+dDTHBJdqjZ8mV0DWOQIH+Q=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=tV2RPxYymevwfznEk5nrcB8Zci5mJcfZ/PUYWJwKrnU1GFrTu7ugVgyDZN882z7DeotLL6vRFtiAk8Z/o8xQiBlf9F/syxO3+Fd1gEnGMuNFxtg+4H0j3Z8vu4yFz6KllMKB6vH2NwXVCD29ZX0YDWTWHAc5Sd8PwJ9pjtZetlQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--vdonnefort.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=3O0PSCGb; arc=none smtp.client-ip=209.85.208.73 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--vdonnefort.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="3O0PSCGb" Received: by mail-ed1-f73.google.com with SMTP id 4fb4d7f45d1cf-660af6dee06so8490100a12.3 for ; Mon, 09 Mar 2026 09:26:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1773073571; x=1773678371; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=Ik5Gwulkcj6xpLazaW4U87LROZJemTRhzFJsU5ExpD4=; b=3O0PSCGbTdYC0aFfyNCtHtMxvSIbDCSz6M4HlOymC5CCXk805VeEIX3nLwwKDmS1Ty y+Dkp6WWGl/5AxWH7g0lKdcu50lqvesiRUiuX3ljqWIpSgZCDIy0hpUyf0twjnJHLt4a 2qwuig4HDNMtxlboOEpXCDxP5Y0woat7G/ZmFjS+O3XT2SJ0C8GzI1gm9bZadR6q03U8 FYSc88C0z+wLn5zqeqwNvtYPWAEtC1ShChUOdZYRCea/dQvCYYjuwNlZfwdY1AM6S1TE tH3NshDUdf8MXfSe+L7SQs1nEKExK3AF92PE1ucs132pALWQtIsLjknF5ceScZK3KjPZ MrBA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1773073571; x=1773678371; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=Ik5Gwulkcj6xpLazaW4U87LROZJemTRhzFJsU5ExpD4=; b=ajP3JKlYXTxNKdywYMUa2oaH8WPYNufApLBlXgOaukePvNeEAnwJwkqG38ChkTKJnn hbbpXGsfM00v6UcwF+VGb5IFWGzJmI54h1qsO5RcXw/W/vagOzFh0UZiZYjTXHCRUYKp CRfJB5S/Jcijm65ixysm2shr6aC1qmHc61fR3crnuLBmuhFaknmXh44kM6bVrr7FsT45 AvNHQE1sgXiWaNgskktc2VcxuKXV0byoR9cTjpPSaQ3mc/70+rR1pOjwqxJHFRJG5+Us Il5wOefmR8e2rBram/ceRLFj9sEG0QZmG7RfN0gVXVniBj0TELY36mQBrcIFgSJcDjg6 UsoQ== X-Forwarded-Encrypted: i=1; AJvYcCWBD8SFucP/Tnd/I8SMhz+WAnVy0r+wJuBKT50cfMcd1NFOzcHYMab12+ILv8rggzUzRGwJ9s3J32W9uew=@vger.kernel.org X-Gm-Message-State: AOJu0YwqlQ/Nxr6HD+boYbcC6ojcRp1ymraj2USfV2ahjvXmY5lYKZ0V 0ALoYy378Dh73d/W0clgm/0f4ayXjPVueQROFUq/fCpFTmM0kwB7gcg3ptTuD6mTv8VV/+5Mpmu UzHE7RJfV82kC2w4IcYYWgA== X-Received: from edxu25.prod.google.com ([2002:a05:6402:659:b0:661:2fe8:17bd]) (user=vdonnefort job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6402:1466:b0:661:7b69:b45 with SMTP id 4fb4d7f45d1cf-6619d4d4fc4mr6921428a12.13.1773073570997; Mon, 09 Mar 2026 09:26:10 -0700 (PDT) Date: Mon, 9 Mar 2026 16:24:57 +0000 In-Reply-To: <20260309162516.2623589-1-vdonnefort@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260309162516.2623589-1-vdonnefort@google.com> X-Mailer: git-send-email 2.53.0.473.g4a7958ca14-goog Message-ID: <20260309162516.2623589-12-vdonnefort@google.com> Subject: [PATCH v14 11/30] tracing: Add helpers to create trace remote events From: Vincent Donnefort To: rostedt@goodmis.org, mhiramat@kernel.org, mathieu.desnoyers@efficios.com, linux-trace-kernel@vger.kernel.org, maz@kernel.org, oliver.upton@linux.dev, joey.gouly@arm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com Cc: kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, jstultz@google.com, qperret@google.com, will@kernel.org, aneesh.kumar@kernel.org, kernel-team@android.com, linux-kernel@vger.kernel.org, Vincent Donnefort Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Declaring remote events can be cumbersome let's add a set of macros to simplify developers life. The declaration of a remote event is very similar to kernel's events: REMOTE_EVENT(name, id, RE_STRUCT( re_field(u64 foo) ), RE_PRINTK("foo=3D%llu", __entry->foo) ) Reviewed-by: Steven Rostedt (Google) Signed-off-by: Vincent Donnefort diff --git a/include/linux/trace_remote_event.h b/include/linux/trace_remot= e_event.h index a4449008a075..c8ae1e1f5e72 100644 --- a/include/linux/trace_remote_event.h +++ b/include/linux/trace_remote_event.h @@ -5,6 +5,7 @@ =20 struct trace_remote; struct trace_event_fields; +struct trace_seq; =20 struct remote_event_hdr { unsigned short id; @@ -20,4 +21,13 @@ struct remote_event { char *print_fmt; void (*print)(void *evt, struct trace_seq *seq); }; + +#define RE_STRUCT(__args...) __args +#define re_field(__type, __field) __type __field; + +#define REMOTE_EVENT_FORMAT(__name, __struct) \ + struct remote_event_format_##__name { \ + struct remote_event_hdr hdr; \ + __struct \ + } #endif diff --git a/include/trace/define_remote_events.h b/include/trace/define_re= mote_events.h new file mode 100644 index 000000000000..676e803dc144 --- /dev/null +++ b/include/trace/define_remote_events.h @@ -0,0 +1,73 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +#include +#include +#include +#include + +#define REMOTE_EVENT_INCLUDE(__file) __stringify(../../__file) + +#ifdef REMOTE_EVENT_SECTION +# define __REMOTE_EVENT_SECTION(__name) __used __section(REMOTE_EVENT_SECT= ION"."#__name) +#else +# define __REMOTE_EVENT_SECTION(__name) +#endif + +#define REMOTE_PRINTK_COUNT_ARGS(__args...) \ + __COUNT_ARGS(, ##__args, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 0) + +#define __remote_printk0() \ + trace_seq_putc(seq, '\n') + +#define __remote_printk1(__fmt) \ + trace_seq_puts(seq, " " __fmt "\n") \ + +#define __remote_printk2(__fmt, __args...) \ +do { \ + trace_seq_putc(seq, ' '); \ + trace_seq_printf(seq, __fmt, __args); \ + trace_seq_putc(seq, '\n'); \ +} while (0) + +/* Apply the appropriate trace_seq sequence according to the number of arg= uments */ +#define remote_printk(__args...) \ + CONCATENATE(__remote_printk, REMOTE_PRINTK_COUNT_ARGS(__args))(__args) + +#define RE_PRINTK(__args...) __args + +#define REMOTE_EVENT(__name, __id, __struct, __printk) \ + REMOTE_EVENT_FORMAT(__name, __struct); \ + static void remote_event_print_##__name(void *evt, struct trace_seq *seq)= \ + { \ + struct remote_event_format_##__name __maybe_unused *__entry =3D evt; \ + trace_seq_puts(seq, #__name); \ + remote_printk(__printk); \ + } +#include REMOTE_EVENT_INCLUDE(REMOTE_EVENT_INCLUDE_FILE) + +#undef REMOTE_EVENT +#undef RE_PRINTK +#undef re_field +#define re_field(__type, __field) \ + { \ + .type =3D #__type, .name =3D #__field, \ + .size =3D sizeof(__type), .align =3D __alignof__(__type), \ + .is_signed =3D is_signed_type(__type), \ + }, +#define __entry REC +#define RE_PRINTK(__fmt, __args...) "\"" __fmt "\", " __stringify(__args) +#define REMOTE_EVENT(__name, __id, __struct, __printk) \ + static struct trace_event_fields remote_event_fields_##__name[] =3D { \ + __struct \ + {} \ + }; \ + static char remote_event_print_fmt_##__name[] =3D __printk; \ + static struct remote_event __REMOTE_EVENT_SECTION(__name) \ + remote_event_##__name =3D { \ + .name =3D #__name, \ + .id =3D __id, \ + .fields =3D remote_event_fields_##__name, \ + .print_fmt =3D remote_event_print_fmt_##__name, \ + .print =3D remote_event_print_##__name, \ + } +#include REMOTE_EVENT_INCLUDE(REMOTE_EVENT_INCLUDE_FILE) --=20 2.53.0.473.g4a7958ca14-goog