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drm/i915: Remove completed fences after a wait
If we wait upon the full (i.e. all shared fences, or upon an exclusive fence) reservation object successfully, we know that all fences beneath it have been signaled, so long as no new fences were added whilst we slept. If the reservation_object remains the same, as detected by its seqcount, we can then reap all the fences upon completion. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Reviewed-by: Matthew Auld <matthew.auld@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170217151304.16665-6-chris@chris-wilson.co.uk
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@ -427,7 +427,9 @@ i915_gem_object_wait_reservation(struct reservation_object *resv,
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long timeout,
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struct intel_rps_client *rps)
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{
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unsigned int seq = __read_seqcount_begin(&resv->seq);
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struct dma_fence *excl;
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bool prune_fences = false;
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if (flags & I915_WAIT_ALL) {
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struct dma_fence **shared;
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@ -452,15 +454,26 @@ i915_gem_object_wait_reservation(struct reservation_object *resv,
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for (; i < count; i++)
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dma_fence_put(shared[i]);
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kfree(shared);
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prune_fences = count && timeout >= 0;
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} else {
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excl = reservation_object_get_excl_rcu(resv);
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}
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if (excl && timeout >= 0)
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if (excl && timeout >= 0) {
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timeout = i915_gem_object_wait_fence(excl, flags, timeout, rps);
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prune_fences = timeout >= 0;
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}
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dma_fence_put(excl);
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if (prune_fences && !__read_seqcount_retry(&resv->seq, seq)) {
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reservation_object_lock(resv, NULL);
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if (!__read_seqcount_retry(&resv->seq, seq))
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reservation_object_add_excl_fence(resv, NULL);
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reservation_object_unlock(resv);
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}
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return timeout;
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}
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