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drm/ttm: use RCU in ttm_bo_flush_all_fences

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This allows it to call the function without the lock held.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: xinhui pan <xinhui.pan@amd.com>
Link: https://patchwork.freedesktop.org/patch/352742/
This commit is contained in:
Christian König 2020-02-10 14:41:39 +01:00
parent 832c90df89
commit e81a2557e0
1 changed files with 6 additions and 4 deletions
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10
drivers/gpu/drm/ttm/ttm_bo.c
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@ -429,22 +429,24 @@ static int ttm_bo_individualize_resv(struct ttm_buffer_object *bo)
static void ttm_bo_flush_all_fences(struct ttm_buffer_object *bo) static void ttm_bo_flush_all_fences(struct ttm_buffer_object *bo)
{ {
struct dma_resv *resv = &bo->base._resv;
struct dma_resv_list *fobj; struct dma_resv_list *fobj;
struct dma_fence *fence; struct dma_fence *fence;
int i; int i;
fobj = dma_resv_get_list(&bo->base._resv); rcu_read_lock();
fence = dma_resv_get_excl(&bo->base._resv); fobj = rcu_dereference(resv->fence);
fence = rcu_dereference(resv->fence_excl);
if (fence && !fence->ops->signaled) if (fence && !fence->ops->signaled)
dma_fence_enable_sw_signaling(fence); dma_fence_enable_sw_signaling(fence);
for (i = 0; fobj && i < fobj->shared_count; ++i) { for (i = 0; fobj && i < fobj->shared_count; ++i) {
fence = rcu_dereference_protected(fobj->shared[i], fence = rcu_dereference(fobj->shared[i]);
dma_resv_held(bo->base.resv));
if (!fence->ops->signaled) if (!fence->ops->signaled)
dma_fence_enable_sw_signaling(fence); dma_fence_enable_sw_signaling(fence);
} }
rcu_read_unlock();
} }
static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo) static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo)