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| author | Matthew Auld <matthew.auld@intel.com> | 2023-07-10 12:40:39 +0300 |
|---|---|---|
| committer | Rodrigo Vivi <rodrigo.vivi@intel.com> | 2023-12-21 19:35:22 +0300 |
| commit | 38fa29dc2b73b54299e973d292ec7fd507d3b8c0 (patch) | |
| tree | be5b29491cc4c94538d7a4ccb5c908dcd915dbad /drivers/gpu/drm/xe/xe_gt_tlb_invalidation.c | |
| parent | b06d47be7c83165d3b3e45e1d5f9520b79c7f5cc (diff) | |
| download | linux-38fa29dc2b73b54299e973d292ec7fd507d3b8c0.tar.xz | |
drm/xe/tlb: drop unnecessary smp_wmb()
wake_up_all() and wait_event_timeout() already have the correct barriers
as per https://www.kernel.org/doc/Documentation/memory-barriers.txt.
This should ensure that the seqno_recv write can't be re-ordered wrt to
the actual wake_up_all() i.e we get woken up but there is no write. The
reader side with wait_event_timeout() also has the correct barriers.
With that drop the hand rolled smp_wmb(), which is anyway missing some
kind of matching barrier on the reader side.
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: José Roberto de Souza <jose.souza@intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Diffstat (limited to 'drivers/gpu/drm/xe/xe_gt_tlb_invalidation.c')
| -rw-r--r-- | drivers/gpu/drm/xe/xe_gt_tlb_invalidation.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/gpu/drm/xe/xe_gt_tlb_invalidation.c b/drivers/gpu/drm/xe/xe_gt_tlb_invalidation.c index f77368a16409..48eb05f763e9 100644 --- a/drivers/gpu/drm/xe/xe_gt_tlb_invalidation.c +++ b/drivers/gpu/drm/xe/xe_gt_tlb_invalidation.c @@ -333,8 +333,11 @@ int xe_guc_tlb_invalidation_done_handler(struct xe_guc *guc, u32 *msg, u32 len) expected_seqno, msg[0]); } + /* + * wake_up_all() and wait_event_timeout() already have the correct + * barriers. + */ gt->tlb_invalidation.seqno_recv = msg[0]; - smp_wmb(); wake_up_all(&guc->ct.wq); fence = list_first_entry_or_null(>->tlb_invalidation.pending_fences, |