From mboxrd@z Thu Jan 1 00:00:00 1970 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 61FE82D63F8 for ; Tue, 10 Mar 2026 14:35:54 +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=1773153354; cv=none; b=fNtGLCPnkPC6jOqqjeAAUixDX2jqteOFLMTyH4GhyMo5V/ImVLBfCilGUhzOz0zEDCc04+ACNyKFmtohNvimbh/Z2r/n73S60EBi54kRNy8GgZq10fpWAzUqqYjYZJYzyS7EXfbsZ8XZGyMIBuEgKwD8Qlxv/zbIFfmwicZTEBg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773153354; c=relaxed/simple; bh=6T6sOnUbGCRJC153BgNXMup0+OvfrQe/nGWYX13K4WQ=; h=Message-ID:Date:From:To:Cc:Subject:References:MIME-Version: Content-Type; b=GI3NOkJlgRSkwNpLXC9+rs/paCwhT7iWscaj+ZAI/NDXRklUcodVhj9eRirUnxygbf3PZl7qI/RlUTmjRhwjl0S30JM3h+xCrXkH+5gc6XkBcMrOZEa3UDLfvqZo2fQl/9f1Pwma0EvI52MYM+GWob9G7hNmdrKsVtQCTl0W7HU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=QDkZVPWw; 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="QDkZVPWw" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 45387C2BCAF; Tue, 10 Mar 2026 14:35:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1773153354; bh=6T6sOnUbGCRJC153BgNXMup0+OvfrQe/nGWYX13K4WQ=; h=Date:From:To:Cc:Subject:References:From; b=QDkZVPWwYlfp6O9vht3zjiQYkFBLdYnC2B0XRZQGQL+qPN5AcRfxtKH2JFQmsl6Hl 8h+YwwsUMhimmrD2QNVbWR/k7WLORYxnfzOsHYqHY9DfF2brFEBA0j7c1wCKIlG/e4 1nl09t3n7lv1ndxR0b+OM2Hl6sWnLYif4J5jcJESJqzR1LIPzshXPw4BxYGFac2tgk zlcmKIgSMnttovKdl7YxBksxO60KAzCzFyQC/wTKy5BtrVicuQKioQPE2TJoFwEoGU a9F6X81G2TvLAIDhGezm7bmhc7glG7LzDH7t6M0/stOCXJAq+B75kPsLsEKiB6vjv/ dhKS0P4QuRKRA== Received: from rostedt by gandalf with local (Exim 4.99.1) (envelope-from ) id 1vzyBo-00000002Zel-1lOa; Tue, 10 Mar 2026 10:36:04 -0400 Message-ID: <20260310143604.297139008@kernel.org> User-Agent: quilt/0.69 Date: Tue, 10 Mar 2026 10:35:26 -0400 From: Steven Rostedt To: linux-kernel@vger.kernel.org Cc: Masami Hiramatsu , Mark Rutland , Mathieu Desnoyers , Andrew Morton , Vincent Donnefort Subject: [for-next][PATCH 11/18] tracing: Add helpers to create trace remote events References: <20260310143515.132579088@kernel.org> 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 From: Vincent Donnefort 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=%llu", __entry->foo) ) Link: https://patch.msgid.link/20260309162516.2623589-12-vdonnefort@google.com Reviewed-by: Steven Rostedt (Google) Signed-off-by: Vincent Donnefort Signed-off-by: Steven Rostedt (Google) --- include/linux/trace_remote_event.h | 10 ++++ include/trace/define_remote_events.h | 73 ++++++++++++++++++++++++++++ 2 files changed, 83 insertions(+) create mode 100644 include/trace/define_remote_events.h diff --git a/include/linux/trace_remote_event.h b/include/linux/trace_remote_event.h index a4449008a075..c8ae1e1f5e72 100644 --- a/include/linux/trace_remote_event.h +++ b/include/linux/trace_remote_event.h @@ -5,6 +5,7 @@ struct trace_remote; struct trace_event_fields; +struct trace_seq; 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_remote_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_SECTION"."#__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 arguments */ +#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 = 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 = #__type, .name = #__field, \ + .size = sizeof(__type), .align = __alignof__(__type), \ + .is_signed = 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[] = { \ + __struct \ + {} \ + }; \ + static char remote_event_print_fmt_##__name[] = __printk; \ + static struct remote_event __REMOTE_EVENT_SECTION(__name) \ + remote_event_##__name = { \ + .name = #__name, \ + .id = __id, \ + .fields = remote_event_fields_##__name, \ + .print_fmt = remote_event_print_fmt_##__name, \ + .print = remote_event_print_##__name, \ + } +#include REMOTE_EVENT_INCLUDE(REMOTE_EVENT_INCLUDE_FILE) -- 2.51.0