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drm/i915/gt: Wait for RCUs frees before asserting idle on unload

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During driver unload, we have many asserts that we have released our
bookkeeping structs and are idle. In some cases, these struct are
protected by RCU and we do not release them until after an RCU grace
period.

Reported-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Fixes: 130a95e909 ("drm/i915/gem: Consolidate ctx->engines[] release")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200312115307.16460-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson
2020-03-12 11:53:07 +00:00
parent c46c320c02
commit 22ca8a452e
2 changed files with 4 additions and 0 deletions
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3
drivers/gpu/drm/i915/gt/intel_gt.c
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@@ -667,6 +667,9 @@ void intel_gt_driver_release(struct intel_gt *gt)
void intel_gt_driver_late_release(struct intel_gt *gt)
{
/* We need to wait for inflight RCU frees to release their grip */
rcu_barrier();
intel_uc_driver_late_release(&gt->uc);
intel_gt_fini_requests(gt);
intel_gt_fini_reset(gt);