drm/amdgpu: Move dmabuf attach/detach to backend_(un)bind

The dmabuf attachment should be updated by moving the SG BO to DOMAIN_CPU
and back to DOMAIN_GTT. This does not necessarily invoke the
populate/unpopulate callbacks. Do this in backend_bind/unbind instead.

Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Acked-by: Oak Zeng <Oak.Zeng@amd.com>
Acked-by: Ramesh Errabolu <Ramesh.Errabolu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
index bc838c3..928e8d5 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
@@ -587,9 +587,6 @@ kfd_mem_dmaunmap_dmabuf(struct kfd_mem_attachment *attachment)
 
        amdgpu_bo_placement_from_domain(bo, AMDGPU_GEM_DOMAIN_CPU);
        ttm_bo_validate(&bo->tbo, &bo->placement, &ctx);
-       /* FIXME: This does not guarantee that amdgpu_ttm_tt_unpopulate is
-        * called
-        */
 }
 
 static void

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index 01775a6..d16b6db 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -907,7 +907,23 @@ static int amdgpu_ttm_backend_bind(struct ttm_device *bdev,
                        DRM_ERROR("failed to pin userptr\n");
                        return r;
                }
+       } else if (ttm->page_flags & TTM_PAGE_FLAG_SG) {
+               if (!ttm->sg) {
+                       struct dma_buf_attachment *attach;
+                       struct sg_table *sgt;
+
+                       attach = gtt->gobj->import_attach;
+                       sgt = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL);
+                       if (IS_ERR(sgt))
+                               return PTR_ERR(sgt);
+
+                       ttm->sg = sgt;
+               }
+
+               drm_prime_sg_to_dma_addr_array(ttm->sg, gtt->ttm.dma_address,
+                                              ttm->num_pages);
        }
+
        if (!ttm->num_pages) {
                WARN(1, "nothing to bind %u pages for mreg %p back %p!\n",
                     ttm->num_pages, bo_mem, ttm);
@@ -1034,8 +1050,15 @@ static void amdgpu_ttm_backend_unbind(struct ttm_device *bdev,
        int r;
 
        /* if the pages have userptr pinning then clear that first */
-       if (gtt->userptr)
+       if (gtt->userptr) {
                amdgpu_ttm_tt_unpin_userptr(bdev, ttm);
+       } else if (ttm->sg && gtt->gobj->import_attach) {
+               struct dma_buf_attachment *attach;
+
+               attach = gtt->gobj->import_attach;
+               dma_buf_unmap_attachment(attach, ttm->sg, DMA_BIDIRECTIONAL);
+               ttm->sg = NULL;
+       }
 
        if (!gtt->bound)
                return;
@@ -1122,23 +1145,8 @@ static int amdgpu_ttm_tt_populate(struct ttm_device *bdev,
                return 0;
        }
 
-       if (ttm->page_flags & TTM_PAGE_FLAG_SG) {
-               if (!ttm->sg) {
-                       struct dma_buf_attachment *attach;
-                       struct sg_table *sgt;
-
-                       attach = gtt->gobj->import_attach;
-                       sgt = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL);
-                       if (IS_ERR(sgt))
-                               return PTR_ERR(sgt);
-
-                       ttm->sg = sgt;
-               }
-
-               drm_prime_sg_to_dma_addr_array(ttm->sg, gtt->ttm.dma_address,
-                                              ttm->num_pages);
+       if (ttm->page_flags & TTM_PAGE_FLAG_SG)
                return 0;
-       }
 
        return ttm_pool_alloc(&adev->mman.bdev.pool, ttm, ctx);
 }
@@ -1162,15 +1170,6 @@ static void amdgpu_ttm_tt_unpopulate(struct ttm_device *bdev,
                return;
        }
 
-       if (ttm->sg && gtt->gobj->import_attach) {
-               struct dma_buf_attachment *attach;
-
-               attach = gtt->gobj->import_attach;
-               dma_buf_unmap_attachment(attach, ttm->sg, DMA_BIDIRECTIONAL);
-               ttm->sg = NULL;
-               return;
-       }
-
        if (ttm->page_flags & TTM_PAGE_FLAG_SG)
                return;