From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga07.intel.com (mga07.intel.com [134.134.136.100]) by gabe.freedesktop.org (Postfix) with ESMTPS id AAB0F10E2CC for ; Wed, 20 Apr 2022 06:12:59 +0000 (UTC) From: Ashutosh Dixit To: igt-dev@lists.freedesktop.org Date: Tue, 19 Apr 2022 23:12:49 -0700 Message-Id: <85c51c99da76e3fe286ed28e80fa964e148f6020.1650435058.git.ashutosh.dixit@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Subject: [igt-dev] [PATCH i-g-t 1/3] lib/igt_sysfs: Add helpers to iterate over GTs List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: igt-dev-bounces@lists.freedesktop.org Sender: "igt-dev" List-ID: From: Umesh Nerlige Ramappa Provide iterators to: - construct the subdirectory string for a gt - obtain fd for the subdirectory of the interface v2: Separated out RPS functionality into seaparate patch (Ashutosh) Cc: Kamil Konieczny Cc: Andi Shyti Cc: Tvrtko Ursulin Cc: Sujaritha Sundaresan Signed-off-by: Umesh Nerlige Ramappa Signed-off-by: Ashutosh Dixit --- lib/igt_sysfs.c | 71 +++++++++++++++++++++++++++++++++++++++++++++++++ lib/igt_sysfs.h | 13 +++++++++ 2 files changed, 84 insertions(+) diff --git a/lib/igt_sysfs.c b/lib/igt_sysfs.c index f8ef23e2c8e2..b167c0507039 100644 --- a/lib/igt_sysfs.c +++ b/lib/igt_sysfs.c @@ -54,6 +54,21 @@ * provides basic support for like igt_sysfs_open(). */ +/** + * igt_sysfs_has_attr: + * @dir: sysfs directory fd + * @attr: attr inside sysfs dir that needs to be checked for existence + * + * This checks if specified attr exists in device sysfs directory. + * + * Returns: + * true if attr exists in sysfs, false otherwise. + */ +bool igt_sysfs_has_attr(int dir, const char *attr) +{ + return !faccessat(dir, attr, F_OK, 0); +} + /** * igt_sysfs_path: * @device: fd of the device @@ -104,6 +119,62 @@ int igt_sysfs_open(int device) return open(path, O_RDONLY); } +/** + * igt_sysfs_gt_path: + * @device: fd of the device + * @gt: gt number + * @path: buffer to fill with the sysfs gt path to the device + * @pathlen: length of @path buffer + * + * This finds the sysfs directory corresponding to @device and @gt. If the gt + * specific directory is not available and gt is 0, path is filled with sysfs + * base directory. + * + * Returns: + * The directory path, or NULL on failure. + */ +char *igt_sysfs_gt_path(int device, int gt, char *path, int pathlen) +{ + struct stat st; + + if (device < 0) + return NULL; + + if (igt_debug_on(fstat(device, &st)) || igt_debug_on(!S_ISCHR(st.st_mode))) + return NULL; + + snprintf(path, pathlen, "/sys/dev/char/%d:%d/gt/gt%d", + major(st.st_rdev), minor(st.st_rdev), gt); + + if (!igt_debug_on(access(path, F_OK))) + return path; + else if (!igt_debug_on(gt != 0)) + return igt_sysfs_path(device, path, pathlen); + + return NULL; +} + +/** + * igt_sysfs_gt_open: + * @device: fd of the device + * @gt: gt number + * + * This opens the sysfs gt directory corresponding to device and gt for use + * with igt_sysfs_set() and igt_sysfs_get(). + * + * Returns: + * The directory fd, or -1 on failure. + */ +int igt_sysfs_gt_open(int device, int gt) +{ + char path[96]; + + if (igt_debug_on(!igt_sysfs_gt_path(device, gt, path, sizeof(path)))) + return -1; + + return open(path, O_RDONLY); +} + /** * igt_sysfs_write: * @dir: directory for the device from igt_sysfs_open() diff --git a/lib/igt_sysfs.h b/lib/igt_sysfs.h index 56741a0a37e3..33317a969619 100644 --- a/lib/igt_sysfs.h +++ b/lib/igt_sysfs.h @@ -28,8 +28,21 @@ #include #include +#define for_each_sysfs_gt_path(i915__, path__, pathlen__) \ + for (int gt__ = 0; \ + igt_sysfs_gt_path(i915__, gt__, path__, pathlen__) != NULL; \ + gt__++) + +#define for_each_sysfs_gt_dirfd(i915__, dirfd__, gt__) \ + for (gt__ = 0; \ + (dirfd__ = igt_sysfs_gt_open(i915__, gt__)) != -1; \ + close(dirfd__), gt__++) + char *igt_sysfs_path(int device, char *path, int pathlen); int igt_sysfs_open(int device); +char *igt_sysfs_gt_path(int device, int gt, char *path, int pathlen); +int igt_sysfs_gt_open(int device, int gt); +bool igt_sysfs_has_attr(int dir, const char *attr); int igt_sysfs_read(int dir, const char *attr, void *data, int len); int igt_sysfs_write(int dir, const char *attr, const void *data, int len); -- 2.34.1