diff options
| -rw-r--r-- | drivers/dma-buf/dma-resv.c | 2 | ||||
| -rw-r--r-- | drivers/dma-buf/st-dma-resv.c | 2 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/gem/i915_gem_clflush.c | 2 | ||||
| -rw-r--r-- | drivers/gpu/drm/ttm/ttm_bo.c | 2 | ||||
| -rw-r--r-- | drivers/gpu/drm/ttm/ttm_bo_util.c | 4 | ||||
| -rw-r--r-- | drivers/gpu/drm/vmwgfx/vmwgfx_bo.c | 2 | ||||
| -rw-r--r-- | include/linux/dma-resv.h | 24 |
7 files changed, 28 insertions, 10 deletions
diff --git a/drivers/dma-buf/dma-resv.c b/drivers/dma-buf/dma-resv.c index 378d47e1cfea..f4860e5f2d8b 100644 --- a/drivers/dma-buf/dma-resv.c +++ b/drivers/dma-buf/dma-resv.c @@ -726,7 +726,7 @@ EXPORT_SYMBOL_GPL(dma_resv_test_signaled); */ void dma_resv_describe(struct dma_resv *obj, struct seq_file *seq) { - static const char *usage[] = { "write", "read" }; + static const char *usage[] = { "kernel", "write", "read" }; struct dma_resv_iter cursor; struct dma_fence *fence; diff --git a/drivers/dma-buf/st-dma-resv.c b/drivers/dma-buf/st-dma-resv.c index d0f7c2bfd4f0..062b57d63fa6 100644 --- a/drivers/dma-buf/st-dma-resv.c +++ b/drivers/dma-buf/st-dma-resv.c @@ -296,7 +296,7 @@ int dma_resv(void) int r; spin_lock_init(&fence_lock); - for (usage = DMA_RESV_USAGE_WRITE; usage <= DMA_RESV_USAGE_READ; + for (usage = DMA_RESV_USAGE_KERNEL; usage <= DMA_RESV_USAGE_READ; ++usage) { r = subtests(tests, (void *)(unsigned long)usage); if (r) diff --git a/drivers/gpu/drm/i915/gem/i915_gem_clflush.c b/drivers/gpu/drm/i915/gem/i915_gem_clflush.c index f5f2b8b115ea..0512afdd20d8 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_clflush.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_clflush.c @@ -117,7 +117,7 @@ bool i915_gem_clflush_object(struct drm_i915_gem_object *obj, i915_fence_timeout(i915), I915_FENCE_GFP); dma_resv_add_fence(obj->base.resv, &clflush->base.dma, - DMA_RESV_USAGE_WRITE); + DMA_RESV_USAGE_KERNEL); dma_fence_work_commit(&clflush->base); /* * We must have successfully populated the pages(since we are diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c index d74f9eea855e..6bf3fb1c8045 100644 --- a/drivers/gpu/drm/ttm/ttm_bo.c +++ b/drivers/gpu/drm/ttm/ttm_bo.c @@ -739,7 +739,7 @@ static int ttm_bo_add_move_fence(struct ttm_buffer_object *bo, return ret; } - dma_resv_add_fence(bo->base.resv, fence, DMA_RESV_USAGE_WRITE); + dma_resv_add_fence(bo->base.resv, fence, DMA_RESV_USAGE_KERNEL); ret = dma_resv_reserve_fences(bo->base.resv, 1); if (unlikely(ret)) { diff --git a/drivers/gpu/drm/ttm/ttm_bo_util.c b/drivers/gpu/drm/ttm/ttm_bo_util.c index 7a96a1db13a7..99deb45894f4 100644 --- a/drivers/gpu/drm/ttm/ttm_bo_util.c +++ b/drivers/gpu/drm/ttm/ttm_bo_util.c @@ -508,7 +508,7 @@ static int ttm_bo_move_to_ghost(struct ttm_buffer_object *bo, return ret; dma_resv_add_fence(&ghost_obj->base._resv, fence, - DMA_RESV_USAGE_WRITE); + DMA_RESV_USAGE_KERNEL); /** * If we're not moving to fixed memory, the TTM object @@ -562,7 +562,7 @@ int ttm_bo_move_accel_cleanup(struct ttm_buffer_object *bo, struct ttm_resource_manager *man = ttm_manager_type(bdev, new_mem->mem_type); int ret = 0; - dma_resv_add_fence(bo->base.resv, fence, DMA_RESV_USAGE_WRITE); + dma_resv_add_fence(bo->base.resv, fence, DMA_RESV_USAGE_KERNEL); if (!evict) ret = ttm_bo_move_to_ghost(bo, fence, man->use_tt); else if (!from->use_tt && pipeline) diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_bo.c b/drivers/gpu/drm/vmwgfx/vmwgfx_bo.c index bec50223efe5..408ede1f967f 100644 --- a/drivers/gpu/drm/vmwgfx/vmwgfx_bo.c +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_bo.c @@ -759,7 +759,7 @@ void vmw_bo_fence_single(struct ttm_buffer_object *bo, ret = dma_resv_reserve_fences(bo->base.resv, 1); if (!ret) dma_resv_add_fence(bo->base.resv, &fence->base, - DMA_RESV_USAGE_WRITE); + DMA_RESV_USAGE_KERNEL); else /* Last resort fallback when we are OOM */ dma_fence_wait(&fence->base, false); diff --git a/include/linux/dma-resv.h b/include/linux/dma-resv.h index 7bb7e7edbb6f..a749f229ae91 100644 --- a/include/linux/dma-resv.h +++ b/include/linux/dma-resv.h @@ -55,12 +55,30 @@ struct dma_resv_list; * This enum describes the different use cases for a dma_resv object and * controls which fences are returned when queried. * - * An important fact is that there is the order WRITE<READ and when the - * dma_resv object is asked for fences for one use case the fences for the - * lower use case are returned as well. + * An important fact is that there is the order KERNEL<WRITE<READ and + * when the dma_resv object is asked for fences for one use case the fences + * for the lower use case are returned as well. + * + * For example when asking for WRITE fences then the KERNEL fences are returned + * as well. Similar when asked for READ fences then both WRITE and KERNEL + * fences are returned as well. */ enum dma_resv_usage { /** + * @DMA_RESV_USAGE_KERNEL: For in kernel memory management only. + * + * This should only be used for things like copying or clearing memory + * with a DMA hardware engine for the purpose of kernel memory + * management. + * + * Drivers *always* must wait for those fences before accessing the + * resource protected by the dma_resv object. The only exception for + * that is when the resource is known to be locked down in place by + * pinning it previously. + */ + DMA_RESV_USAGE_KERNEL, + + /** * @DMA_RESV_USAGE_WRITE: Implicit write synchronization. * * This should only be used for userspace command submissions which add |