From patchwork Fri Apr 11 13:04:26 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sunil Khatri X-Patchwork-Id: 14048377 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 75807C369A8 for ; Fri, 11 Apr 2025 13:05:50 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 0D7E410EBAE; Fri, 11 Apr 2025 13:05:47 +0000 (UTC) Received: from rtg-sunil-navi33.amd.com (unknown [165.204.156.251]) by gabe.freedesktop.org (Postfix) with ESMTPS id 65D2410EBA8; Fri, 11 Apr 2025 13:05:43 +0000 (UTC) Received: from rtg-sunil-navi33.amd.com (localhost [127.0.0.1]) by rtg-sunil-navi33.amd.com (8.15.2/8.15.2/Debian-22ubuntu3) with ESMTP id 53BD5XN64105017; Fri, 11 Apr 2025 18:35:33 +0530 Received: (from sunil@localhost) by rtg-sunil-navi33.amd.com (8.15.2/8.15.2/Submit) id 53BD5XvR4105016; Fri, 11 Apr 2025 18:35:33 +0530 From: Sunil Khatri To: dri-devel@lists.freedesktop.org, amd-gfx@lists.freedesktop.org Cc: Alex Deucher , =?utf-8?q?Christian_K=C3=B6nig?= , Sunil Khatri Subject: [PATCH v1 1/3] drm: function to get process name and pid Date: Fri, 11 Apr 2025 18:34:26 +0530 Message-Id: <20250411130428.4104957-1-sunil.khatri@amd.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Add helper function which get the process information for the drm_file and updates the user provided character buffer with the information of process name and pid as a string. Signed-off-by: Sunil Khatri --- drivers/gpu/drm/drm_file.c | 30 ++++++++++++++++++++++++++++++ include/drm/drm_file.h | 1 + 2 files changed, 31 insertions(+) diff --git a/drivers/gpu/drm/drm_file.c b/drivers/gpu/drm/drm_file.c index cb5f22f5bbb6..4434258d21b5 100644 --- a/drivers/gpu/drm/drm_file.c +++ b/drivers/gpu/drm/drm_file.c @@ -965,6 +965,36 @@ void drm_show_fdinfo(struct seq_file *m, struct file *f) } EXPORT_SYMBOL(drm_show_fdinfo); +/** + * drm_process_info - Fill info string with process name and pid + * @file_priv: context of interest for process name and pid + * @proc_info: user char ptr to write the string to + * @buff_size: size of the buffer passed for the string + * + * This update the user provided buffer with process + * name and pid information for @file_priv + */ +void drm_process_info(struct drm_file *file_priv, char *proc_info, size_t buff_size) +{ + struct task_struct *task; + struct pid *pid; + struct drm_device *dev = file_priv->minor->dev; + + if (!proc_info) { + drm_err(dev, "Invalid user buffer\n"); + return; + } + + rcu_read_lock(); + pid = rcu_dereference(file_priv->pid); + task = pid_task(pid, PIDTYPE_TGID); + if (task) + snprintf(proc_info, buff_size, "comm:%s pid:%d", task->comm, task->pid); + + rcu_read_unlock(); +} +EXPORT_SYMBOL(drm_process_info); + /** * mock_drm_getfile - Create a new struct file for the drm device * @minor: drm minor to wrap (e.g. #drm_device.primary) diff --git a/include/drm/drm_file.h b/include/drm/drm_file.h index f0ef32e9fa5e..c01b34936968 100644 --- a/include/drm/drm_file.h +++ b/include/drm/drm_file.h @@ -501,6 +501,7 @@ void drm_print_memory_stats(struct drm_printer *p, void drm_show_memory_stats(struct drm_printer *p, struct drm_file *file); void drm_show_fdinfo(struct seq_file *m, struct file *f); +void drm_process_info(struct drm_file *file_priv, char *proc_info, size_t buff_size); struct file *mock_drm_getfile(struct drm_minor *minor, unsigned int flags);