drm/amdgpu: Fix register access violation

fault_status is read only register. fault_cntl
is not accessible from guest environment.
Signed-off-by: Hawking Zhang <Hawking.Zhang@amd.com>
Reviewed-by: Tao Zhou <tao.zhou1@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/gfxhub_v1_2.c

@@ -629,9 +629,11 @@ static bool gfxhub_v1_2_query_utcl2_poison_status(struct amdgpu_device *adev,
 
 	status = RREG32_SOC15(GC, GET_INST(GC, xcc_id), regVM_L2_PROTECTION_FAULT_STATUS);
 	fed = REG_GET_FIELD(status, VM_L2_PROTECTION_FAULT_STATUS, FED);
-	/* reset page fault status */
-	WREG32_P(SOC15_REG_OFFSET(GC, GET_INST(GC, xcc_id),
-			regVM_L2_PROTECTION_FAULT_STATUS), 1, ~1);
+	if (!amdgpu_sriov_vf(adev)) {
+		/* clear page fault status and address */
+		WREG32_P(SOC15_REG_OFFSET(GC, GET_INST(GC, xcc_id),
+			 regVM_L2_PROTECTION_FAULT_CNTL), 1, ~1);
+	}
 
 	return fed;
 }

drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c

@@ -672,7 +672,8 @@ static int gmc_v9_0_process_interrupt(struct amdgpu_device *adev,
 	    (amdgpu_ip_version(adev, GC_HWIP, 0) >= IP_VERSION(9, 4, 2)))
 		return 0;
 
-	WREG32_P(hub->vm_l2_pro_fault_cntl, 1, ~1);
+	if (!amdgpu_sriov_vf(adev))
+		WREG32_P(hub->vm_l2_pro_fault_cntl, 1, ~1);
 
 	amdgpu_vm_update_fault_cache(adev, entry->pasid, addr, status, vmhub);
 

drivers/gpu/drm/amd/amdgpu/mmhub_v1_8.c

@@ -566,9 +566,11 @@ static bool mmhub_v1_8_query_utcl2_poison_status(struct amdgpu_device *adev,
 
 	status = RREG32_SOC15(MMHUB, hub_inst, regVM_L2_PROTECTION_FAULT_STATUS);
 	fed = REG_GET_FIELD(status, VM_L2_PROTECTION_FAULT_STATUS, FED);
-	/* reset page fault status */
-	WREG32_P(SOC15_REG_OFFSET(MMHUB, hub_inst,
-			regVM_L2_PROTECTION_FAULT_STATUS), 1, ~1);
+	if (!amdgpu_sriov_vf(adev)) {
+		/* clear page fault status and address */
+		WREG32_P(SOC15_REG_OFFSET(MMHUB, hub_inst,
+			 regVM_L2_PROTECTION_FAULT_STATUS), 1, ~1);
+	}
 
 	return fed;
 }