drm/amdgpu: Account for shadow PTs in mapping update IB size.

When amdgpu_vm_frag_ptes calls amdgpu_vm_update_ptes and the pt
has a shadow PT we mirror all the write to the shadow PT too, which
results in twice the commands.

Signed-off-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index c9223a5184de..545531db66db 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -1536,10 +1536,12 @@ static int amdgpu_vm_bo_update_mapping(struct amdgpu_device *adev,
         nptes = last - start + 1;
 
         /*
-         * reserve space for one command every (1 << BLOCK_SIZE)
+         * reserve space for two commands every (1 << BLOCK_SIZE)
          *  entries or 2k dwords (whatever is smaller)
+         *
+         * The second command is for the shadow pagetables.
          */
-        ncmds = (nptes >> min(adev->vm_manager.block_size, 11u)) + 1;
+        ncmds = ((nptes >> min(adev->vm_manager.block_size, 11u)) + 1) * 2;
 
         /* padding, etc. */
         ndw = 64;