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Fri, 03 Oct 2025 06:39:05 -0700 (PDT) Date: Fri, 3 Oct 2025 14:38:05 +0100 In-Reply-To: <20251003133825.2068970-1-vdonnefort@google.com> Mime-Version: 1.0 References: <20251003133825.2068970-1-vdonnefort@google.com> X-Mailer: git-send-email 2.51.0.618.g983fd99d29-goog Message-ID: <20251003133825.2068970-9-vdonnefort@google.com> Subject: [PATCH v7 08/28] tracing: Add init callback 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-Type: text/plain; charset="UTF-8" X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251003_063907_716088_FFAF7899 X-CRM114-Status: GOOD ( 11.64 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Add a .init call back so the trace remote callers can add entries to the tracefs directory. Signed-off-by: Vincent Donnefort diff --git a/include/linux/trace_remote.h b/include/linux/trace_remote.h index 55754ef78104..15a579633123 100644 --- a/include/linux/trace_remote.h +++ b/include/linux/trace_remote.h @@ -3,11 +3,14 @@ #ifndef _LINUX_TRACE_REMOTE_H #define _LINUX_TRACE_REMOTE_H +#include #include /** * struct trace_remote_callbacks - Callbacks used by Tracefs to control the remote * + * @init: Called once the remote has been registered. Allows the + * caller to extend the Tracefs remote directory * @load_trace_buffer: Called before Tracefs accesses the trace buffer for the first * time. Must return a &trace_buffer_desc * (most likely filled with trace_remote_alloc_buffer()) @@ -23,6 +26,7 @@ * new reader-page from the @cpu ring-buffer. */ struct trace_remote_callbacks { + int (*init)(struct dentry *d, void *priv); struct trace_buffer_desc *(*load_trace_buffer)(unsigned long size, void *priv); void (*unload_trace_buffer)(struct trace_buffer_desc *desc, void *priv); int (*enable_tracing)(bool enable, void *priv); diff --git a/kernel/trace/trace_remote.c b/kernel/trace/trace_remote.c index c011df20df95..55ba3fd9e002 100644 --- a/kernel/trace/trace_remote.c +++ b/kernel/trace/trace_remote.c @@ -837,6 +837,7 @@ static int trace_remote_init_tracefs(const char *name, struct trace_remote *remo int trace_remote_register(const char *name, struct trace_remote_callbacks *cbs, void *priv) { struct trace_remote *remote; + int ret; remote = kzalloc(sizeof(*remote), GFP_KERNEL); if (!remote) @@ -854,7 +855,11 @@ int trace_remote_register(const char *name, struct trace_remote_callbacks *cbs, return -ENOMEM; } - return 0; + ret = cbs->init ? cbs->init(remote->dentry, priv) : 0; + if (ret) + pr_err("Init failed for trace remote '%s' (%d)\n", name, ret); + + return ret; } void trace_remote_free_buffer(struct trace_buffer_desc *desc) -- 2.51.0.618.g983fd99d29-goog