drm/amdgpu/nv: add PCI reset support

Use generic PCI reset for GPU reset if the user specifies
PCI reset as the reset mechanism.  This should in general
only be used for validation.
Acked-by: NEvan Quan <evan.quan@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/nv.c

@@ -391,7 +391,8 @@ nv_asic_reset_method(struct amdgpu_device *adev)
 
 	if (amdgpu_reset_method == AMD_RESET_METHOD_MODE1 ||
 	    amdgpu_reset_method == AMD_RESET_METHOD_MODE2 ||
-	    amdgpu_reset_method == AMD_RESET_METHOD_BACO)
+	    amdgpu_reset_method == AMD_RESET_METHOD_BACO ||
+	    amdgpu_reset_method == AMD_RESET_METHOD_PCI)
 		return amdgpu_reset_method;
 
 	if (amdgpu_reset_method != -1)
@@ -423,6 +424,10 @@ static int nv_asic_reset(struct amdgpu_device *adev)
 		return 0;
 
 	switch (nv_asic_reset_method(adev)) {
+	case AMD_RESET_METHOD_PCI:
+		dev_info(adev->dev, "PCI reset\n");
+		ret = amdgpu_device_pci_reset(adev);
+		break;
 	case AMD_RESET_METHOD_BACO:
 		dev_info(adev->dev, "BACO reset\n");