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drm/xe: Add xe_tlb_inval_idle helper

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Introduce the xe_tlb_inval_idle helper to detect whether any TLB
invalidations are currently in flight. This is used in context-based TLB
invalidations to determine whether dummy TLB invalidations need to be
sent to maintain proper TLB invalidation fence ordering..

v2:
 - Implement xe_tlb_inval_idle based on pending list

Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Stuart Summers <stuart.summers@intel.com>
Tested-by: Stuart Summers <stuart.summers@intel.com>
Link: https://patch.msgid.link/20260116221731.868657-10-matthew.brost@intel.com
This commit is contained in:
Matthew Brost 2026-01-16 14:17:29 -08:00
parent 2d93d5d530
commit 6b42b635d6
2 changed files with 23 additions and 0 deletions
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21
drivers/gpu/drm/xe/xe_tlb_inval.c
View File

@ -41,11 +41,14 @@ static void xe_tlb_inval_fence_fini(struct xe_tlb_inval_fence *fence)
static void
xe_tlb_inval_fence_signal(struct xe_tlb_inval_fence *fence)
{
struct xe_tlb_inval *tlb_inval = fence->tlb_inval;
bool stack = test_bit(FENCE_STACK_BIT, &fence->base.flags);
lockdep_assert_held(&fence->tlb_inval->pending_lock);
list_del(&fence->link);
if (list_empty(&tlb_inval->pending_fences))
cancel_delayed_work(&tlb_inval->fence_tdr);
trace_xe_tlb_inval_fence_signal(fence->tlb_inval->xe, fence);
xe_tlb_inval_fence_fini(fence);
dma_fence_signal(&fence->base);
@ -465,3 +468,21 @@ void xe_tlb_inval_fence_init(struct xe_tlb_inval *tlb_inval,
dma_fence_get(&fence->base);
fence->tlb_inval = tlb_inval;
}
/**
* xe_tlb_inval_idle() - Initialize TLB invalidation is idle
* @tlb_inval: TLB invalidation client
*
* Check the TLB invalidation seqno to determine if it is idle (i.e., no TLB
* invalidations are in flight). Expected to be called in the backend after the
* fence has been added to the pending list, and takes this into account.
*
* Return: True if TLB invalidation client is idle, False otherwise
*/
bool xe_tlb_inval_idle(struct xe_tlb_inval *tlb_inval)
{
lockdep_assert_held(&tlb_inval->seqno_lock);
guard(spinlock_irq)(&tlb_inval->pending_lock);
return list_is_singular(&tlb_inval->pending_fences);
}

2
drivers/gpu/drm/xe/xe_tlb_inval.h
View File

@ -43,4 +43,6 @@ xe_tlb_inval_fence_wait(struct xe_tlb_inval_fence *fence)
void xe_tlb_inval_done_handler(struct xe_tlb_inval *tlb_inval, int seqno);
bool xe_tlb_inval_idle(struct xe_tlb_inval *tlb_inval);
#endif /* _XE_TLB_INVAL_ */