[PATCH] drm/amdgpu: force using sdma to update vm page table when mmio is blocked

[Yang Wang]

when mmio protection feature is enabled in hypervisor,
it will cause guest OS can't R/W HDP regiters,
and using cpu to update page table is not working well.

force using sdma to update page table when mmio is blocked.

Signed-off-by: Yang Wang <KevinYang.Wang at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index b23cb463b106..0f86f0b2e183 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -2959,6 +2959,9 @@ int amdgpu_vm_init(struct amdgpu_device *adev, struct amdgpu_vm *vm)
 	vm->use_cpu_for_update = !!(adev->vm_manager.vm_update_mode &
 				    AMDGPU_VM_USE_CPU_FOR_GFX);
 
+	if (vm->use_cpu_for_update && amdgpu_sriov_vf(adev) && amdgpu_virt_mmio_blocked(adev))
+		vm->use_cpu_for_update = false;
+
 	DRM_DEBUG_DRIVER("VM update mode is %s\n",
 			 vm->use_cpu_for_update ? "CPU" : "SDMA");
 	WARN_ONCE((vm->use_cpu_for_update &&
@@ -3094,6 +3097,10 @@ int amdgpu_vm_make_compute(struct amdgpu_device *adev, struct amdgpu_vm *vm)
 	/* Update VM state */
 	vm->use_cpu_for_update = !!(adev->vm_manager.vm_update_mode &
 				    AMDGPU_VM_USE_CPU_FOR_COMPUTE);
+
+	if (vm->use_cpu_for_update && amdgpu_sriov_vf(adev) && amdgpu_virt_mmio_blocked(adev))
+		vm->use_cpu_for_update = false;
+
 	DRM_DEBUG_DRIVER("VM update mode is %s\n",
 			 vm->use_cpu_for_update ? "CPU" : "SDMA");
 	WARN_ONCE((vm->use_cpu_for_update &&
-- 
2.25.1