[PATCH 1/3] drm/xe/oa: Allow stream enable/disable functions to return error

[Ashutosh Dixit]

Stream enable/disable functions previously had void return because failure
during function execution was not possible. This will change when we
introduce functionality to disable preemption on the stream exec
queue. Therefore, in preparation for this functionality, prepare this code
to be able to handle error returns.

Signed-off-by: Ashutosh Dixit <ashutosh.dixit at intel.com>
---
 drivers/gpu/drm/xe/xe_oa.c | 38 ++++++++++++++++++++++----------------
 1 file changed, 22 insertions(+), 16 deletions(-)

diff --git a/drivers/gpu/drm/xe/xe_oa.c b/drivers/gpu/drm/xe/xe_oa.c
index 9263ae9a864e..a68659fd5386 100644
--- a/drivers/gpu/drm/xe/xe_oa.c
+++ b/drivers/gpu/drm/xe/xe_oa.c
@@ -1013,24 +1013,26 @@ static void xe_oa_stream_disable(struct xe_oa_stream *stream)
 		hrtimer_cancel(&stream->poll_check_timer);
 }
 
-static void xe_oa_enable_locked(struct xe_oa_stream *stream)
+static int xe_oa_enable_locked(struct xe_oa_stream *stream)
 {
 	if (stream->enabled)
-		return;
-
-	stream->enabled = true;
+		return 0;
 
 	xe_oa_stream_enable(stream);
+
+	stream->enabled = true;
+	return 0;
 }
 
-static void xe_oa_disable_locked(struct xe_oa_stream *stream)
+static int xe_oa_disable_locked(struct xe_oa_stream *stream)
 {
 	if (!stream->enabled)
-		return;
-
-	stream->enabled = false;
+		return 0;
 
 	xe_oa_stream_disable(stream);
+
+	stream->enabled = false;
+	return 0;
 }
 
 static long xe_oa_config_locked(struct xe_oa_stream *stream, u64 arg)
@@ -1105,11 +1107,9 @@ static long xe_oa_ioctl_locked(struct xe_oa_stream *stream,
 {
 	switch (cmd) {
 	case DRM_XE_PERF_IOCTL_ENABLE:
-		xe_oa_enable_locked(stream);
-		return 0;
+		return xe_oa_enable_locked(stream);
 	case DRM_XE_PERF_IOCTL_DISABLE:
-		xe_oa_disable_locked(stream);
-		return 0;
+		return xe_oa_disable_locked(stream);
 	case DRM_XE_PERF_IOCTL_CONFIG:
 		return xe_oa_config_locked(stream, arg);
 	case DRM_XE_PERF_IOCTL_STATUS:
@@ -1432,19 +1432,25 @@ static int xe_oa_stream_open_ioctl_locked(struct xe_oa *oa,
 	if (ret)
 		goto err_free;
 
+	if (!param->disabled) {
+		ret = xe_oa_enable_locked(stream);
+		if (ret)
+			goto err_destroy;
+	}
+
 	stream_fd = anon_inode_getfd("[xe_oa]", &xe_oa_fops, stream, 0);
 	if (stream_fd < 0) {
 		ret = stream_fd;
-		goto err_destroy;
+		goto err_disable;
 	}
 
-	if (!param->disabled)
-		xe_oa_enable_locked(stream);
-
 	/* Hold a reference on the drm device till stream_fd is released */
 	drm_dev_get(&stream->oa->xe->drm);
 
 	return stream_fd;
+err_disable:
+	if (!param->disabled)
+		xe_oa_disable_locked(stream);
 err_destroy:
 	xe_oa_stream_destroy(stream);
 err_free:
-- 
2.41.0