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AJvYcCXfaP9vFdU0LojSwJAz9YNK6wd5YFQn8Nn7d/hLALZTjUQWHPUDkisYKt12LjQ3QEURNY8Jidrsz7DlFZ8=@vger.kernel.org X-Gm-Message-State: AOJu0YxyB7TaY8OowV/I9p4XX/JeO9JtfW8FTbva3evDdb07c3mELE7D xCIuDNI6p/25jF2pyqSs51EbhTt0qaffgu2d+s9YhWHoYdlc3UpfhrOA9eHWAe2ciPLy9fd3pjT rvZc1EWFOx1mcvzOG4XsOZA== X-Google-Smtp-Source: AGHT+IHsx8P5Vs9M8mnwbrakrOPGXjbApzSto+nkAQM4Qfn3U+7Iz7dieUnzsV71vFzwGuJGfn1Qycvc9bWbG44R X-Received: from wmcq5.prod.google.com ([2002:a05:600c:c105:b0:46e:32e6:eb8f]) (user=vdonnefort job=prod-delivery.src-stubby-dispatcher) by 2002:a05:600c:8b61:b0:45b:79fd:cb3d with SMTP id 5b1f17b1804b1-46e71157894mr21943305e9.36.1759498747404; Fri, 03 Oct 2025 06:39:07 -0700 (PDT) Date: Fri, 3 Oct 2025 14:38:08 +0100 In-Reply-To: <20251003133825.2068970-1-vdonnefort@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20251003133825.2068970-1-vdonnefort@google.com> X-Mailer: git-send-email 2.51.0.618.g983fd99d29-goog Message-ID: <20251003133825.2068970-12-vdonnefort@google.com> Subject: [PATCH v7 11/28] 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 --- 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..03c9f5515c5a --- /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(_0, _1, _2, _n, __args...) _n +#define REMOTE_PRINTK_COUNT_ARGS(__args...) __REMOTE_PRINTK_COUNT_ARGS(, #= #__args, 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 2.51.0.618.g983fd99d29-goog