drm/amdgpu: add support for BO_VAs without BO v2

For PRT support we need mappings which aren't backed by any memory.

v2: fix parameter checking

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 14 insertions, 6 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index bd0d33125c18..f922e4356758 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -1117,7 +1117,7 @@ int amdgpu_vm_bo_update(struct amdgpu_device *adev,
         struct dma_fence *exclusive;
         int r;
 
-        if (clear) {
+        if (clear || !bo_va->bo) {
                 mem = NULL;
                 nodes = NULL;
                 exclusive = NULL;
@@ -1134,9 +1134,15 @@ int amdgpu_vm_bo_update(struct amdgpu_device *adev,
                 exclusive = reservation_object_get_excl(bo_va->bo->tbo.resv);
         }
 
-        flags = amdgpu_ttm_tt_pte_flags(adev, bo_va->bo->tbo.ttm, mem);
-        gtt_flags = (amdgpu_ttm_is_bound(bo_va->bo->tbo.ttm) &&
-                adev == amdgpu_ttm_adev(bo_va->bo->tbo.bdev)) ? flags : 0;
+        if (bo_va->bo) {
+                flags = amdgpu_ttm_tt_pte_flags(adev, bo_va->bo->tbo.ttm, mem);
+                gtt_flags = (amdgpu_ttm_is_bound(bo_va->bo->tbo.ttm) &&
+                        adev == amdgpu_ttm_adev(bo_va->bo->tbo.bdev)) ?
+                        flags : 0;
+        } else {
+                flags = 0x0;
+                gtt_flags = ~0x0;
+        }
 
         spin_lock(&vm->status_lock);
         if (!list_empty(&bo_va->vm_status))
@@ -1271,7 +1277,8 @@ struct amdgpu_bo_va *amdgpu_vm_bo_add(struct amdgpu_device *adev,
         INIT_LIST_HEAD(&bo_va->invalids);
         INIT_LIST_HEAD(&bo_va->vm_status);
 
-        list_add_tail(&bo_va->bo_list, &bo->va);
+        if (bo)
+                list_add_tail(&bo_va->bo_list, &bo->va);
 
         return bo_va;
 }
@@ -1309,7 +1316,8 @@ int amdgpu_vm_bo_map(struct amdgpu_device *adev,
 
         /* make sure object fit at this offset */
         eaddr = saddr + size - 1;
-        if ((saddr >= eaddr) || (offset + size > amdgpu_bo_size(bo_va->bo)))
+        if (saddr >= eaddr ||
+            (bo_va->bo && offset + size > amdgpu_bo_size(bo_va->bo)))
                 return -EINVAL;
 
         last_pfn = eaddr / AMDGPU_GPU_PAGE_SIZE;