Re: [PATCH 07/15] drm/i915/guc/slpc: Remove BUG_ON in guc_submission_disable

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On 7/27/2021 5:20 PM, Matthew Brost wrote:
On Mon, Jul 26, 2021 at 12:07:52PM -0700, Vinay Belgaumkar wrote:
The assumption when it was added was there would be no wakerefs
held. However, if we fail to enable SLPC, we will still be
holding a wakeref.


So this is if intel_guc_slpc_enable() fails, right? Not seeing where the
wakeref is taken. It also seems wrong not to drop the wakeref before
calling intel_guc_submission_disable, hence the GEM_BUG_ON in this
function.

Can you explain this bit more?

I should change the desc a little. The BUG_ON assumed GT would not be awake i.e at shutdown, and there would be 0 GT_PM references. However, this slpc_enable is in gt_resume path (gt_init_hw calls uc_init_hw). Here, gt_pm_get reference is held, so it will result in BUG_ON when submission_disable is called.

Thanks,
Vinay.

Matt

Signed-off-by: Vinay Belgaumkar <vinay.belgaumkar@xxxxxxxxx>
---
  drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c | 4 ----
  1 file changed, 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
index b6338742a594..48cbd800ca54 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
@@ -2523,10 +2523,6 @@ void intel_guc_submission_enable(struct intel_guc *guc)
void intel_guc_submission_disable(struct intel_guc *guc)
  {
-	struct intel_gt *gt = guc_to_gt(guc);
-
-	GEM_BUG_ON(gt->awake); /* GT should be parked first */
-
  	/* Note: By the time we're here, GuC may have already been reset */
  }
--
2.25.0




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