From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wr1-f73.google.com (mail-wr1-f73.google.com [209.85.221.73]) (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 B51D03B7B6F for ; Fri, 6 Mar 2026 14:36:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.221.73 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772807764; cv=none; b=YyQkEeMF2QwCi0EgGjbJGsRbojvG6Ky7eXBEi5LarbI1gui7BVbv33WZGFPEB34QHRD65fgW5vt8qcfW5V3C7G2q3C1d3H4YP+FFmq3u7qN7BKHMhRjmO01I4hjzLZccRhcogCQoIXeVKHuJzY15MYDdyGm/00hWJmTXl4YlPp4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772807764; c=relaxed/simple; bh=nCoqfYLkFALSGqFmK5+OUBL2T+SjXlSRskeq0sqM6lo=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=Ouge6wiPQW7SM0bOwQIohMQPZbsVnmsohx4fNEjnG2LLVWYD/va2qD1bvjLJP8vfvfSHWg7MsJm4L1R27/xwx7xvlu9Z4H5xDPBxegfNU/sDJqvtj/pPbMNDdYyWXt/7hIJ2DXL8UjEmSANxC0Lb2JHSxNjuoF6oF0rhxXXNt9k= 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=Ff7HgNG8; arc=none smtp.client-ip=209.85.221.73 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="Ff7HgNG8" Received: by mail-wr1-f73.google.com with SMTP id ffacd0b85a97d-439c794edd9so2865934f8f.3 for ; Fri, 06 Mar 2026 06:36:01 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1772807760; x=1773412560; 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=/el005jPydhTNUS1hr5dgVCq32s5flSC0Li9+BCYSpc=; b=Ff7HgNG8qkz/SWjxwzh2AAjN07lK7vhPSr+wcruMKyD76jRTj1gURwDMcuAG6JXxd7 KmKFWmRPQnMckV/CJRQ+E6NEIX/ynL7Dql1KpNtoPtoPL6PJP/fwUnE+pUzCLmh3LVJM roaWijkoA6lLPQZ+0z8N8EI95osWCUif3OiC87eCQq5+sYsdAVsm1hIM8GE8C65Zujo7 tWmmvurZzM5ZGZ5rSyNyfmlYQpDBKSFBupYqndOefcZlvBpK6FW2przKtGdRd9sbt8RP VuW+txHt4eAln1a6l8nK5LUDTscRPgGQLZHUFM+lBINjioj1byraMpX9cGjQofL2+Ibu pAdA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1772807760; x=1773412560; 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=/el005jPydhTNUS1hr5dgVCq32s5flSC0Li9+BCYSpc=; b=CMKgmFH+3+scCdU+7YRKhLBCOl/oWBuTQ7mRsMuIQNAC0kpztA2QIma6MoJ/wsMYY4 yKtnQu+5iFWjjYSWTZDcqsaCMsdgZnk4dRiM+jeUaj2qt3AXTw865h9jhIFs0KzUgVFO Y/fIXrFKD+0Uj/USm36H0t2rYAoMg00M4o6LuzRv91E9O3PFr0eAXwTRlfMM35V8mnMZ tbYdrkW6wePx90zechJqODSx25D+5ZqfowWf/rNLWDKJDR+Bst14/LPHPGofSHcVKOkU kaBc4/mC/qLCAb7kbepz1icYRw28c+A4Pix/0jXYGRAnUShy4jwIfD6rll5f8ttZl+Hy mdEQ== X-Forwarded-Encrypted: i=1; AJvYcCWcvNdCCyCfB8dvFsZi2SZ4L1eCGXBO75P3mlgJ8S4775cB3KX7/NsVYC7QCW95Fwm1S6uX/kgSuDuxA9EpJT8RDVk=@vger.kernel.org X-Gm-Message-State: AOJu0YyA8jkPTuSmJDVBJfsP3g55aeEzqIqi8S2rPLmqTSGq7lIjl5v5 BQ5QgfO91rudaLO40GqIIUDzg8KCvi+5eVNnKNIE5Htdf148j6VcgAAmGJFAr0wY+DG8ypAwF/D hu35iHXoP282YSmkatcTAPA== X-Received: from wrph18.prod.google.com ([2002:adf:f4d2:0:b0:439:cb0d:43ff]) (user=vdonnefort job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6000:40dc:b0:439:c9d0:5fc2 with SMTP id ffacd0b85a97d-439da891b2cmr4112557f8f.39.1772807759879; Fri, 06 Mar 2026 06:35:59 -0800 (PST) Date: Fri, 6 Mar 2026 14:35:12 +0000 In-Reply-To: <20260306143536.339777-1-vdonnefort@google.com> Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260306143536.339777-1-vdonnefort@google.com> X-Mailer: git-send-email 2.53.0.473.g4a7958ca14-goog Message-ID: <20260306143536.339777-9-vdonnefort@google.com> Subject: [PATCH v13 08/32] 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" Add a .init call back so the trace remote callers can add entries to the tracefs directory. Reviewed-by: Steven Rostedt (Google) Signed-off-by: Vincent Donnefort diff --git a/include/linux/trace_remote.h b/include/linux/trace_remote.h index 10ca03dc192b..090c58b7d92b 100644 --- a/include/linux/trace_remote.h +++ b/include/linux/trace_remote.h @@ -3,10 +3,13 @@ #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()) @@ -22,6 +25,7 @@ * 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 039ba71c3b3e..294d051dcef1 100644 --- a/kernel/trace/trace_remote.c +++ b/kernel/trace/trace_remote.c @@ -863,6 +863,7 @@ 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_obj(*remote); if (!remote) @@ -880,7 +881,11 @@ 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; } EXPORT_SYMBOL_GPL(trace_remote_register); -- 2.53.0.473.g4a7958ca14-goog