[igt-dev] [PATCH i-g-t 3/6] lib/sysfs: helper for number of gts

[priyanka.dandamudi at intel.com]

From: Marcin Bernatowicz <marcin.bernatowicz at linux.intel.com>

Added convenience function returning number of gts.
It is calculated as number of gt sysfs entries,
if no entries are found it returns 1 as number of gts.

Signed-off-by: Marcin Bernatowicz <marcin.bernatowicz at linux.intel.com>
Signed-off-by: Priyanka Dandamudi <priyanka.dandamudi at intel.com>
---
 lib/igt_sysfs.c | 21 +++++++++++++++++++++
 lib/igt_sysfs.h |  1 +
 2 files changed, 22 insertions(+)

diff --git a/lib/igt_sysfs.c b/lib/igt_sysfs.c
index b167c050..aebc6eb7 100644
--- a/lib/igt_sysfs.c
+++ b/lib/igt_sysfs.c
@@ -175,6 +175,27 @@ int igt_sysfs_gt_open(int device, int gt)
 	return open(path, O_RDONLY);
 }
 
+/**
+ * igt_sysfs_get_num_gts:
+ * @device: fd of the device
+ *
+ * Reads number of gt sysfs entries.
+ * If no gt sysfs entries are found returns 1
+ * (see igt_sysfs_gt_path).
+ *
+ * Returns: Number of gts (at least one).
+ */
+int igt_sysfs_get_num_gts(int device)
+{
+	int num_gts = 0;
+	char path[96];
+
+	while (igt_sysfs_gt_path(device, num_gts, path, sizeof(path)))
+		++num_gts;
+
+	return num_gts;
+}
+
 /**
  * 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 33317a96..6c8b92a7 100644
--- a/lib/igt_sysfs.h
+++ b/lib/igt_sysfs.h
@@ -42,6 +42,7 @@ 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);
+int igt_sysfs_get_num_gts(int device);
 bool igt_sysfs_has_attr(int dir, const char *attr);
 
 int igt_sysfs_read(int dir, const char *attr, void *data, int len);
-- 
2.25.1