From patchwork Thu Apr 13 22:44:11 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vinay Belgaumkar X-Patchwork-Id: 13210712 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 CDDBCC77B6E for ; Thu, 13 Apr 2023 22:41:38 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 8997110E20E; Thu, 13 Apr 2023 22:41:37 +0000 (UTC) Received: from mga14.intel.com (mga14.intel.com [192.55.52.115]) by gabe.freedesktop.org (Postfix) with ESMTPS id 34C6810E18B; Thu, 13 Apr 2023 22:41:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1681425695; x=1712961695; h=from:to:subject:date:message-id:in-reply-to:references: mime-version:content-transfer-encoding; bh=githB5zBJCX/xHnLRmuyn/yGSw4HIadZsweFS/3RV1Y=; b=EvEewUlA0+LWvA7Yd54IlHTLGs9F4EGAYjunRvYLgh8oI/FevxO7fiK+ yXIdPRv/FcVwS9bnVREJ3e2yCJU4YpSqA2oFzp76FRUxkifRmsj63aGfg 2SYVFSkbTq2vup3M2sJOO5UtnKcfIKSlmXJmNvdaeY3lBqHgBi800g9Py 6F2bfCdVy70OJ3fYhrNaQn/dgWV7aZcZOsHy1xJLuo5Mi90LhFcfHERkV xuqXtAs+xAVXjiDjGIsQ+mkgGp9tFJl8UklZhjuwOxBcwTKDs2oQW+qg4 C+8ulI7WQH9LI4iKAmQF/CZowBVVQySbeMw7vLRAAzR6MPmIDb2r78kH+ g==; X-IronPort-AV: E=McAfee;i="6600,9927,10679"; a="344322264" X-IronPort-AV: E=Sophos;i="5.99,195,1677571200"; d="scan'208";a="344322264" Received: from orsmga005.jf.intel.com ([10.7.209.41]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 Apr 2023 15:41:34 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10679"; a="863960696" X-IronPort-AV: E=Sophos;i="5.99,195,1677571200"; d="scan'208";a="863960696" Received: from vbelgaum-ubuntu.fm.intel.com ([10.1.27.27]) by orsmga005.jf.intel.com with ESMTP; 13 Apr 2023 15:41:34 -0700 From: Vinay Belgaumkar To: intel-gfx@lists.freedesktop.org, igt-dev@lists.freedesktop.org Date: Thu, 13 Apr 2023 15:44:11 -0700 Message-Id: <20230413224414.2313507-2-vinay.belgaumkar@intel.com> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20230413224414.2313507-1-vinay.belgaumkar@intel.com> References: <20230413224414.2313507-1-vinay.belgaumkar@intel.com> MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH i-g-t 1/4] lib/debugfs: Add per GT debugfs helpers X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" These can be used to open per-gt debugfs files. Reviewed-by: Ashutosh Dixit Signed-off-by: Tvrtko Ursulin Signed-off-by: Vinay Belgaumkar --- lib/igt_debugfs.c | 60 +++++++++++++++++++++++++++++++++++++++++++++++ lib/igt_debugfs.h | 4 ++++ 2 files changed, 64 insertions(+) diff --git a/lib/igt_debugfs.c b/lib/igt_debugfs.c index 05889bbe..afde2da6 100644 --- a/lib/igt_debugfs.c +++ b/lib/igt_debugfs.c @@ -217,6 +217,37 @@ int igt_debugfs_dir(int device) return open(path, O_RDONLY); } +/** + * igt_debugfs_gt_dir: + * @device: fd of the device + * @gt: GT instance number + * + * This opens the debugfs directory corresponding to device for use + * with igt_sysfs_get() and related functions. + * + * Returns: + * The directory fd, or -1 on failure. + */ +int igt_debugfs_gt_dir(int device, unsigned int gt) +{ + int debugfs_gt_dir_fd; + char path[PATH_MAX]; + char gtpath[16]; + int ret; + + if (!igt_debugfs_path(device, path, sizeof(path))) + return -1; + + ret = snprintf(gtpath, sizeof(gtpath), "/gt%u", gt); + igt_assert(ret < sizeof(gtpath)); + strncat(path, gtpath, sizeof(path) - 1); + + debugfs_gt_dir_fd = open(path, O_RDONLY); + igt_debug_on_f(debugfs_gt_dir_fd < 0, "path: %s\n", path); + + return debugfs_gt_dir_fd; +} + /** * igt_debugfs_connector_dir: * @device: fd of the device @@ -313,6 +344,35 @@ bool igt_debugfs_exists(int device, const char *filename, int mode) return false; } +/** + * igt_debugfs_gt_open: + * @device: open i915 drm fd + * @gt: gt instance number + * @filename: name of the debugfs node to open + * @mode: mode bits as used by open() + * + * This opens a debugfs file as a Unix file descriptor. The filename should be + * relative to the drm device's root, i.e. without "drm/$minor". + * + * Returns: + * The Unix file descriptor for the debugfs file or -1 if that didn't work out. + */ +int +igt_debugfs_gt_open(int device, unsigned int gt, const char *filename, int mode) +{ + int dir, ret; + + dir = igt_debugfs_gt_dir(device, gt); + if (dir < 0) + return dir; + + ret = openat(dir, filename, mode); + + close(dir); + + return ret; +} + /** * igt_debugfs_simple_read: * @dir: fd of the debugfs directory diff --git a/lib/igt_debugfs.h b/lib/igt_debugfs.h index 4824344a..3e6194ad 100644 --- a/lib/igt_debugfs.h +++ b/lib/igt_debugfs.h @@ -45,6 +45,10 @@ void __igt_debugfs_write(int fd, const char *filename, const char *buf, int size int igt_debugfs_simple_read(int dir, const char *filename, char *buf, int size); bool igt_debugfs_search(int fd, const char *filename, const char *substring); +int igt_debugfs_gt_dir(int device, unsigned int gt); +int igt_debugfs_gt_open(int device, unsigned int gt, const char *filename, + int mode); + /** * igt_debugfs_read: * @filename: name of the debugfs file