Add an usage for kernel submissions. Waiting for those
are mandatory for dynamic DMA-bufs.
v2: use "must" in documentation, fix whitespaces
Signed-off-by: Christian König <christian.koenig@xxxxxxx>
---
drivers/dma-buf/st-dma-resv.c | 2 +-
drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 2 +-
drivers/gpu/drm/amd/amdgpu/amdgpu_uvd.c | 2 +-
drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c | 6 ++++--
drivers/gpu/drm/i915/gem/i915_gem_clflush.c | 2 +-
drivers/gpu/drm/nouveau/nouveau_bo.c | 4 ++--
drivers/gpu/drm/radeon/radeon_uvd.c | 2 +-
drivers/gpu/drm/ttm/ttm_bo.c | 2 +-
drivers/gpu/drm/ttm/ttm_bo_util.c | 4 ++--
drivers/gpu/drm/vmwgfx/vmwgfx_bo.c | 2 +-
drivers/gpu/drm/vmwgfx/vmwgfx_resource.c | 2 +-
drivers/infiniband/core/umem_dmabuf.c | 2 +-
include/linux/dma-resv.h | 22 ++++++++++++++++++++
13 files changed, 39 insertions(+), 15 deletions(-)
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/amd/amdgpu/amdgpu_object.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
index 9085a6b1ad56..1618b6847c69 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
@@ -765,7 +765,7 @@ int amdgpu_bo_kmap(struct amdgpu_bo *bo, void **ptr)
return 0;
}
- r = dma_resv_wait_timeout(bo->tbo.base.resv, DMA_RESV_USAGE_WRITE,
+ r = dma_resv_wait_timeout(bo->tbo.base.resv, DMA_RESV_USAGE_KERNEL,
false, MAX_SCHEDULE_TIMEOUT);
if (r < 0)
return r;
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_uvd.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_uvd.c
index 33deb0df62fd..9e102080dad9 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_uvd.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_uvd.c
@@ -1163,7 +1163,7 @@ static int amdgpu_uvd_send_msg(struct amdgpu_ring *ring, struct amdgpu_bo *bo,
if (direct) {
r = dma_resv_wait_timeout(bo->tbo.base.resv,
- DMA_RESV_USAGE_WRITE, false,
+ DMA_RESV_USAGE_KERNEL, false,
msecs_to_jiffies(10));
if (r == 0)
r = -ETIMEDOUT;
diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c b/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c
index 0cc036d93afc..ab5249d55b32 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c
@@ -185,9 +185,11 @@ static int submit_fence_sync(struct etnaviv_gem_submit *submit)
return ret;
if (submit->flags & ETNA_SUBMIT_NO_IMPLICIT)
- continue;
+ usage = DMA_RESV_USAGE_KERNEL;
+ else
+ usage = dma_resv_usage_rw(bo->flags &
+ ETNA_SUBMIT_BO_WRITE);
- usage = dma_resv_usage_rw(bo->flags & ETNA_SUBMIT_BO_WRITE);
ret = dma_resv_get_fences(robj, usage, &bo->nr_shared,
&bo->shared);
if (ret)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_clflush.c b/drivers/gpu/drm/i915/gem/i915_gem_clflush.c
index 887cb6b71ae4..9a7104251cb3 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_clflush.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_clflush.c
@@ -115,7 +115,7 @@ 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/nouveau/nouveau_bo.c b/drivers/gpu/drm/nouveau/nouveau_bo.c
index 05076e530e7d..13deb6c70ba6 100644
--- a/drivers/gpu/drm/nouveau/nouveau_bo.c
+++ b/drivers/gpu/drm/nouveau/nouveau_bo.c
@@ -962,10 +962,10 @@ nouveau_bo_vm_cleanup(struct ttm_buffer_object *bo,
struct dma_fence *fence;
int ret;
- ret = dma_resv_get_singleton(bo->base.resv, DMA_RESV_USAGE_WRITE,
+ ret = dma_resv_get_singleton(bo->base.resv, DMA_RESV_USAGE_KERNEL,
&fence);
if (ret)
- dma_resv_wait_timeout(bo->base.resv, DMA_RESV_USAGE_WRITE,
+ dma_resv_wait_timeout(bo->base.resv, DMA_RESV_USAGE_KERNEL,
false, MAX_SCHEDULE_TIMEOUT);
nv10_bo_put_tile_region(dev, *old_tile, fence);
diff --git a/drivers/gpu/drm/radeon/radeon_uvd.c b/drivers/gpu/drm/radeon/radeon_uvd.c
index 4000ad2f39ba..488e78889dd6 100644
--- a/drivers/gpu/drm/radeon/radeon_uvd.c
+++ b/drivers/gpu/drm/radeon/radeon_uvd.c
@@ -478,7 +478,7 @@ static int radeon_uvd_cs_msg(struct radeon_cs_parser *p, struct radeon_bo *bo,
return -EINVAL;
}
- r = dma_resv_wait_timeout(bo->tbo.base.resv, DMA_RESV_USAGE_WRITE,
+ r = dma_resv_wait_timeout(bo->tbo.base.resv, DMA_RESV_USAGE_KERNEL,
false, MAX_SCHEDULE_TIMEOUT);
if (r <= 0) {
DRM_ERROR("Failed waiting for UVD message (%d)!\n", r);
diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index 6014c363d6e6..0f0aa96fb051 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -762,7 +762,7 @@ 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 49689c7c8078..98e1c804519e 100644
--- a/drivers/gpu/drm/ttm/ttm_bo_util.c
+++ b/drivers/gpu/drm/ttm/ttm_bo_util.c
@@ -509,7 +509,7 @@ 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
@@ -563,7 +563,7 @@ 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/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c b/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c
index 39081dbf9ac8..f999fdd927df 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c
@@ -1167,7 +1167,7 @@ int vmw_resources_clean(struct vmw_buffer_object *vbo, pgoff_t start,
dma_fence_put(bo->moving);
return dma_resv_get_singleton(bo->base.resv,
- DMA_RESV_USAGE_WRITE,
+ DMA_RESV_USAGE_KERNEL,
&bo->moving);
}
diff --git a/drivers/infiniband/core/umem_dmabuf.c b/drivers/infiniband/core/umem_dmabuf.c
index f9901d273b8e..fce80a4a5147 100644
--- a/drivers/infiniband/core/umem_dmabuf.c
+++ b/drivers/infiniband/core/umem_dmabuf.c
@@ -68,7 +68,7 @@ int ib_umem_dmabuf_map_pages(struct ib_umem_dmabuf *umem_dmabuf)
* the migration.
*/
return dma_resv_wait_timeout(umem_dmabuf->attach->dmabuf->resv,
- DMA_RESV_USAGE_WRITE,
+ DMA_RESV_USAGE_KERNEL,
false, MAX_SCHEDULE_TIMEOUT);
}
EXPORT_SYMBOL(ib_umem_dmabuf_map_pages);
diff --git a/include/linux/dma-resv.h b/include/linux/dma-resv.h
index ae0436d7e7b8..8f4f406a5d02 100644
--- a/include/linux/dma-resv.h
+++ b/include/linux/dma-resv.h
@@ -54,8 +54,30 @@ 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 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.
*
--
2.25.1
