[PATCH 1/2] drm/amdgpu: re-validate per VM BOs if required

[Chunming Zhou]

From: Christian König <ckoenig.leichtzumerken at gmail.com>

If a per VM BO ends up in a allowed domain it never moves back into the
prefered domain.

Change-Id: Ifb3e561785d3b464da28c439b271c26825224c5e
Signed-off-by: Christian König <christian.koenig at amd.com>
Reviewed-and-Tested-by: Chunming Zhou <david1.zhou at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index e9a41dd05345..7db411a282ce 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -1808,14 +1808,16 @@ int amdgpu_vm_handle_moved(struct amdgpu_device *adev,
 
 	spin_lock(&vm->status_lock);
 	while (!list_empty(&vm->moved)) {
-		struct amdgpu_bo_va *bo_va;
 		struct reservation_object *resv;
+		struct amdgpu_bo_va *bo_va;
+		struct amdgpu_bo *bo;
 
 		bo_va = list_first_entry(&vm->moved,
 			struct amdgpu_bo_va, base.vm_status);
 		spin_unlock(&vm->status_lock);
 
-		resv = bo_va->base.bo->tbo.resv;
+		bo = bo_va->base.bo;
+		resv = bo->tbo.resv;
 
 		/* Per VM BOs never need to bo cleared in the page tables */
 		if (resv == vm->root.base.bo->tbo.resv)
@@ -1835,6 +1837,15 @@ int amdgpu_vm_handle_moved(struct amdgpu_device *adev,
 			kcl_reservation_object_unlock(resv);
 
 		spin_lock(&vm->status_lock);
+
+		/* If the BO prefers to be in VRAM, but currently isn't add it
+		 * back to the evicted list so that it gets validated again on
+		 * the next command submission.
+		 */
+		if (resv == vm->root.base.bo->tbo.resv &&
+		    bo->preferred_domains == AMDGPU_GEM_DOMAIN_VRAM &&
+		    bo->tbo.mem.mem_type != TTM_PL_VRAM)
+			list_add_tail(&bo_va->base.vm_status, &vm->evicted);
 	}
 	spin_unlock(&vm->status_lock);
 
-- 
2.14.1