[PATCH v5 15/23] drm/xe/oa: Handle force_wake_get failure in xe_oa_stream_init()

[Himal Prasad Ghimiray]

With xe_force_wake_get() now returning the refcount-incremented domain
mask, a non-zero return value in the case of XE_FORCEWAKE_ALL does not
necessarily indicate success. Compare the return value with
XE_FORCEWAKE_ALL to determine the status of the call.

Modify the return handling of xe_force_wake_get() accordingly and pass
the return value to xe_force_wake_put().

v3
- return xe_wakeref_t instead of int in xe_force_wake_get()
- xe_force_wake_put() error doesn't need to be checked. It internally
WARNS on domain ack failure.

v5
- return unsigned int from xe_force_wake_get()

Cc: Ashutosh Dixit <ashutosh.dixit at intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
Cc: Lucas De Marchi <lucas.demarchi at intel.com>
Signed-off-by: Himal Prasad Ghimiray <himal.prasad.ghimiray at intel.com>
---
 drivers/gpu/drm/xe/xe_oa.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/xe/xe_oa.c b/drivers/gpu/drm/xe/xe_oa.c
index 354ee9045efc..06e71a86cbcb 100644
--- a/drivers/gpu/drm/xe/xe_oa.c
+++ b/drivers/gpu/drm/xe/xe_oa.c
@@ -840,7 +840,7 @@ static void xe_oa_stream_destroy(struct xe_oa_stream *stream)
 
 	xe_oa_free_oa_buffer(stream);
 
-	XE_WARN_ON(xe_force_wake_put(gt_to_fw(gt), XE_FORCEWAKE_ALL));
+	xe_force_wake_put(gt_to_fw(gt), XE_FORCEWAKE_ALL);
 	xe_pm_runtime_put(stream->oa->xe);
 
 	/* Wa_1509372804:pvc: Unset the override of GUCRC mode to enable rc6 */
@@ -1357,6 +1357,7 @@ static int xe_oa_stream_init(struct xe_oa_stream *stream,
 {
 	struct xe_oa_unit *u = param->hwe->oa_unit;
 	struct xe_gt *gt = param->hwe->gt;
+	unsigned int fw_ref;
 	int ret;
 
 	stream->exec_q = param->exec_q;
@@ -1417,7 +1418,11 @@ static int xe_oa_stream_init(struct xe_oa_stream *stream,
 
 	/* Take runtime pm ref and forcewake to disable RC6 */
 	xe_pm_runtime_get(stream->oa->xe);
-	XE_WARN_ON(xe_force_wake_get(gt_to_fw(gt), XE_FORCEWAKE_ALL));
+	fw_ref = xe_force_wake_get(gt_to_fw(gt), XE_FORCEWAKE_ALL);
+	if (fw_ref != XE_FORCEWAKE_ALL) {
+		ret = -ETIMEDOUT;
+		goto err_fw_put;
+	}
 
 	ret = xe_oa_alloc_oa_buffer(stream);
 	if (ret)
@@ -1459,7 +1464,7 @@ static int xe_oa_stream_init(struct xe_oa_stream *stream,
 err_free_oa_buf:
 	xe_oa_free_oa_buffer(stream);
 err_fw_put:
-	XE_WARN_ON(xe_force_wake_put(gt_to_fw(gt), XE_FORCEWAKE_ALL));
+	xe_force_wake_put(gt_to_fw(gt), fw_ref);
 	xe_pm_runtime_put(stream->oa->xe);
 	if (stream->override_gucrc)
 		xe_gt_WARN_ON(gt, xe_guc_pc_unset_gucrc_mode(&gt->uc.guc.pc));
-- 
2.34.1