From nobody Mon Feb 9 16:51:02 2026 Received: from mail-wm1-f74.google.com (mail-wm1-f74.google.com [209.85.128.74]) (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 1FD363314CB for ; Mon, 26 Jan 2026 10:44:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.74 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769424280; cv=none; b=hcifwZQ0DfyY+7gJhZrL41xnqjVcT42Oc8kfBtMrLlrpZfnGtHvYxXiU2E1/kdyd5vnuBXbCB/ztO9TUPJQYkYneEGloVrNhPOnmdlGZAtOQgdR1b42sT0P9MH5loTy3qGOvQvUc5CbFRPXkWIcDNv6IkFLypu1gVbTtCfj3IrQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769424280; c=relaxed/simple; bh=ojWH6wLlvx2Q/qChZ7rj5LS3D3RiSCBq1QSUEso5Js0=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=SOilPCa6k6Xl/kjfQu/hQWeqSKpbzdAJuc4qI4q4K93Sgg/HxoXR2OyXPpZx+j8XSKNr1kDUvyymxsIiqwpgJkOxYf+rr8Bt/8xltiRMuXuWgU0lWIL8xBUdSwz9DNM9VLMdu+i7zcm5TBVGqQDf2LFguCu8vaVzBQl5eg3toWc= 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=QJq8baxy; arc=none smtp.client-ip=209.85.128.74 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="QJq8baxy" Received: by mail-wm1-f74.google.com with SMTP id 5b1f17b1804b1-47ee33324e8so33354535e9.1 for ; Mon, 26 Jan 2026 02:44:38 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1769424276; x=1770029076; 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=eBVdHdK5pnty3kUjGmHkkia8pj/26sMijHr3rT8k8L0=; b=QJq8baxyeDO6PmQcHQZkjH40QkISw38r6guFWKFvzpluwvnLvu4SBGVXUWM83IVLg+ C6V4ywYyYsS99vK3Lw3xm2Qw7tkQ/Mw+IXO3XWrFYDHsgxdo0xchFzkEnVjzGJpF2bG/ UX72e/YtasqAq7xU8BDPvGSbAko2JdQwBiwjq5+3U2lmfc+Z6hLfNGmlIMBCqjf7Z/u8 wz0dLtCcUpaGmnjowc+qQzwuQPhm5SUi1eckD2qAnBoumZwbNdG7ima/jHNoOQCpBTc6 em0m+zCv6Nhb/nZvAGDzlBuKscrKc9kBoWLdQmnCloJGhiQVt/JOcZqL+UqkTGDd/Hey jooA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1769424276; x=1770029076; 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=eBVdHdK5pnty3kUjGmHkkia8pj/26sMijHr3rT8k8L0=; b=SP3Gkhe5qab/aEMxa5NIMH1SDW7hz4MIH4dyTXxHgQqmX1V899lWW7Fc3BD3w7Occ+ Gftcat+CRhyxnbVkEauDaOltDadQdNHOBQFS+mqZmXrqQei+F8Xvf0LT+01J+8lSQtDo vPXa52R9GfRHtUWELX96dB1Q5swzZ4NwRIWL4kI59mFGdu4u9KT5AGyGXxsVpXUkqpE8 o7rfOoRsttr/gl3N858MAnQEgmDtzGxYPsAk92+GHTZHUObyN9/orjlAewb41ac9ZVhe 4dZym6rx0XAtCAdb6IS+t2ieNPsiJ5pZOqT9f5ml0p7cTiNmlFG42SCEB1UEFIjB934x 4RUg== X-Forwarded-Encrypted: i=1; AJvYcCVkN0IrzEOMEMWcI+s/mVFme/sT/STY+wfCuS2nsQuAMOseJjfd6Uzv2auS6PpwC0Z/dFMxze5WVtDbumY=@vger.kernel.org X-Gm-Message-State: AOJu0Yz67C+7BWn+twN3KqQhX7gZECkhx3/Lg5YfoU3PaaWJ+2jkiC8X gqTukQGIEZeKiHy/rj/UKO5GGD/yXjWkmvAzA97PaFCqBDMF2YtjquLALugpGFS2n5LGAJoOhAM SgSIOIGLKK1kgUfNFZv6rNQ== X-Received: from wmdv19.prod.google.com ([2002:a05:600c:12d3:b0:47e:e953:a478]) (user=vdonnefort job=prod-delivery.src-stubby-dispatcher) by 2002:a05:600c:a306:b0:477:a246:8398 with SMTP id 5b1f17b1804b1-4805d9664aemr50974305e9.2.1769424276747; Mon, 26 Jan 2026 02:44:36 -0800 (PST) Date: Mon, 26 Jan 2026 10:44:00 +0000 In-Reply-To: <20260126104419.1649811-1-vdonnefort@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260126104419.1649811-1-vdonnefort@google.com> X-Mailer: git-send-email 2.52.0.457.g6b5491de43-goog Message-ID: <20260126104419.1649811-12-vdonnefort@google.com> Subject: [PATCH v10 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) ) 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 Reviewed-by: Steven Rostedt (Google) --- 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 2.52.0.457.g6b5491de43-goog