From: Rob Clark <robdclark@xxxxxxxxxxxx>
Add a helper that can be used with, for ex, igt_require() so that tests
can be skipped if the kernel is too old.
Signed-off-by: Rob Clark <robdclark@xxxxxxxxxxxx>
---
lib/igt_debugfs.c | 21 +++++++++++++++++++++
lib/igt_debugfs.h | 1 +
2 files changed, 22 insertions(+)
diff --git a/lib/igt_debugfs.c b/lib/igt_debugfs.c
index dd6f2995..7211c410 100644
--- a/lib/igt_debugfs.c
+++ b/lib/igt_debugfs.c
@@ -307,6 +307,27 @@ int igt_debugfs_open(int device, const char *filename, int mode)
return ret;
}
+/**
+ * igt_debugfs_exists:
+ * @device: the drm device file fd
+ * @filename: file name
+ * @mode: mode bits as used by open()
+ *
+ * Test that the specified debugfs file exists and can be opened with the
+ * requested mode.
+ */
+bool igt_debugfs_exists(int device, const char *filename, int mode)
+{
+ int fd = igt_debugfs_open(device, filename, mode);
+
+ if (fd >= 0) {
+ close(fd);
+ return true;
+ }
+
+ return false;
+}
+
/**
* igt_debugfs_simple_read:
* @filename: file name
diff --git a/lib/igt_debugfs.h b/lib/igt_debugfs.h
index b4867681..37e85067 100644
--- a/lib/igt_debugfs.h
+++ b/lib/igt_debugfs.h
@@ -39,6 +39,7 @@ int igt_debugfs_connector_dir(int device, char *conn_name, int mode);
int igt_debugfs_pipe_dir(int device, int pipe, int mode);
int igt_debugfs_open(int fd, const char *filename, int mode);
+bool igt_debugfs_exists(int fd, const char *filename, int mode);
void __igt_debugfs_read(int fd, const char *filename, char *buf, int size);
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);
--
2.33.1
