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AJvYcCXr1hWZ3D99XrHz8ARrdMVrSTS5dQGN8jUVGlcRJGUDVjmt6Z/oYW5D0XsCJDout/+gZLYOIjCl+81GpoE=@vger.kernel.org X-Gm-Message-State: AOJu0YzU51aHFzgQ49HQeGMcxNIazAOXVyLOAZ1+Evb7Fgxh3nxvBXl9 c9Joir+TZd0mGID8bm2CSqEmwDQza+5W/aZnq7dbzVWlO1bZ6r9Ra/3/HqbiQXhj2mwDmdxE3qe a6JjB9cMEWhjuZLh7UV3Ezg== X-Google-Smtp-Source: AGHT+IFZC5BqbrsKWQKCQ336VVxlGCY+mQ6LwsxcCpJ4Gtknluos4raBCaFp3StIQwp/OhM1qMb5B7Y9hxL0l4eT X-Received: from wma14.prod.google.com ([2002:a05:600c:890e:b0:477:10f8:4597]) (user=vdonnefort job=prod-delivery.src-stubby-dispatcher) by 2002:a05:600c:46ce:b0:45b:80ff:58f7 with SMTP id 5b1f17b1804b1-4776bcceb98mr20269535e9.36.1762508338137; Fri, 07 Nov 2025 01:38:58 -0800 (PST) Date: Fri, 7 Nov 2025 09:38:22 +0000 In-Reply-To: <20251107093840.3779150-1-vdonnefort@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20251107093840.3779150-1-vdonnefort@google.com> X-Mailer: git-send-email 2.51.2.1041.gc1ab5b90ca-goog Message-ID: <20251107093840.3779150-11-vdonnefort@google.com> Subject: [PATCH v8 10/28] tracing: Add events/ root files to trace remotes 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" Just like for the kernel events directory, add 'enable', 'header_page' and 'header_event' at the root of the trace remote events/ directory. Signed-off-by: Vincent Donnefort diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c index 4cc5da5cdc87..41975b92a960 100644 --- a/kernel/trace/ring_buffer.c +++ b/kernel/trace/ring_buffer.c @@ -604,7 +604,8 @@ int ring_buffer_print_page_header(struct trace_buffer *= buffer, struct trace_seq trace_seq_printf(s, "\tfield: char data;\t" "offset:%u;\tsize:%u;\tsigned:%u;\n", (unsigned int)offsetof(typeof(field), data), - (unsigned int)buffer->subbuf_size, + (unsigned int)(buffer ? buffer->subbuf_size : + PAGE_SIZE - BUF_PAGE_HDR_SIZE), (unsigned int)is_signed_type(char)); =20 return !trace_seq_has_overflowed(s); diff --git a/kernel/trace/trace_remote.c b/kernel/trace/trace_remote.c index 0131fa8e177a..4f2b67d1bfec 100644 --- a/kernel/trace/trace_remote.c +++ b/kernel/trace/trace_remote.c @@ -1078,10 +1078,145 @@ static int remote_event_callback(const char *name,= umode_t *mode, void **data, return 0; } =20 +static ssize_t remote_events_dir_enable_write(struct file *filp, const cha= r __user *ubuf, + size_t count, loff_t *ppos) +{ + struct trace_remote *remote =3D file_inode(filp)->i_private; + int i, ret; + u8 enable; + + ret =3D kstrtou8_from_user(ubuf, count, 10, &enable); + if (ret) + return ret; + + guard(mutex)(&remote->lock); + + for (i =3D 0; i < remote->nr_events; i++) { + struct remote_event *evt =3D &remote->events[i]; + + trace_remote_enable_event(remote, evt, enable); + } + + return count; +} + +static ssize_t remote_events_dir_enable_read(struct file *filp, char __use= r *ubuf, size_t cnt, + loff_t *ppos) +{ + struct trace_remote *remote =3D file_inode(filp)->i_private; + const char enabled_char[] =3D {'0', '1', 'X'}; + char enabled_str[] =3D " \n"; + int i, enabled =3D -1; + + guard(mutex)(&remote->lock); + + for (i =3D 0; i < remote->nr_events; i++) { + struct remote_event *evt =3D &remote->events[i]; + + if (enabled =3D=3D -1) { + enabled =3D evt->enabled; + } else if (enabled !=3D evt->enabled) { + enabled =3D 2; + break; + } + } + + enabled_str[0] =3D enabled_char[enabled =3D=3D -1 ? 0 : enabled]; + + return simple_read_from_buffer(ubuf, cnt, ppos, enabled_str, 2); +} + +static const struct file_operations remote_events_dir_enable_fops =3D { + .write =3D remote_events_dir_enable_write, + .read =3D remote_events_dir_enable_read, +}; + +static ssize_t +remote_events_dir_header_page_read(struct file *filp, char __user *ubuf, s= ize_t cnt, loff_t *ppos) +{ + struct trace_seq *s; + int ret; + + s =3D kmalloc(sizeof(*s), GFP_KERNEL); + if (!s) + return -ENOMEM; + + trace_seq_init(s); + + ring_buffer_print_page_header(NULL, s); + ret =3D simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, trace_seq_use= d(s)); + kfree(s); + + return ret; +} + +static const struct file_operations remote_events_dir_header_page_fops =3D= { + .read =3D remote_events_dir_header_page_read, +}; + +static ssize_t +remote_events_dir_header_event_read(struct file *filp, char __user *ubuf, = size_t cnt, loff_t *ppos) +{ + struct trace_seq *s; + int ret; + + s =3D kmalloc(sizeof(*s), GFP_KERNEL); + if (!s) + return -ENOMEM; + + trace_seq_init(s); + + ring_buffer_print_entry_header(s); + ret =3D simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, trace_seq_use= d(s)); + kfree(s); + + return ret; +} + +static const struct file_operations remote_events_dir_header_event_fops = =3D { + .read =3D remote_events_dir_header_event_read, +}; + +static int remote_events_dir_callback(const char *name, umode_t *mode, voi= d **data, + const struct file_operations **fops) +{ + if (!strcmp(name, "enable")) { + *mode =3D TRACEFS_MODE_WRITE; + *fops =3D &remote_events_dir_enable_fops; + return 1; + } + + if (!strcmp(name, "header_page")) { + *mode =3D TRACEFS_MODE_READ; + *fops =3D &remote_events_dir_header_page_fops; + return 1; + } + + if (!strcmp(name, "header_event")) { + *mode =3D TRACEFS_MODE_READ; + *fops =3D &remote_events_dir_header_event_fops; + return 1; + } + + return 0; +} + static int trace_remote_init_eventfs(const char *remote_name, struct trace= _remote *remote, struct remote_event *evt) { struct eventfs_inode *eventfs =3D remote->eventfs; + static struct eventfs_entry dir_entries[] =3D { + { + .name =3D "enable", + .callback =3D remote_events_dir_callback, + }, { + .name =3D "header_page", + .callback =3D remote_events_dir_callback, + }, { + .name =3D "header_event", + .callback =3D remote_events_dir_callback, + } + }; static struct eventfs_entry entries[] =3D { { .name =3D "enable", @@ -1097,7 +1232,8 @@ static int trace_remote_init_eventfs(const char *remo= te_name, struct trace_remot bool eventfs_create =3D false; =20 if (!eventfs) { - eventfs =3D eventfs_create_events_dir("events", remote->dentry, NULL, 0,= NULL); + eventfs =3D eventfs_create_events_dir("events", remote->dentry, dir_entr= ies, + ARRAY_SIZE(dir_entries), remote); if (IS_ERR(eventfs)) return PTR_ERR(eventfs); =20 --=20 2.51.2.1041.gc1ab5b90ca-goog