[PATCH] drm/amdgpu: Fix register access violation

[Hawking Zhang]

fault_status is read only register. fault_cntl
is not accessible from guest environment.

Signed-off-by: Hawking Zhang <hawking.zh...@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/gfxhub_v1_2.c | 8 +++++---
 drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c    | 3 ++-
 drivers/gpu/drm/amd/amdgpu/mmhub_v1_8.c  | 8 +++++---
 3 files changed, 12 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/gfxhub_v1_2.c 
b/drivers/gpu/drm/amd/amdgpu/gfxhub_v1_2.c
index e14acab5cceb..72109abe7c86 100644
--- a/drivers/gpu/drm/amd/amdgpu/gfxhub_v1_2.c
+++ b/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;
 }
diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c 
b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
index 88b4644f8e96..b73136d390cc 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
+++ b/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);
 
diff --git a/drivers/gpu/drm/amd/amdgpu/mmhub_v1_8.c 
b/drivers/gpu/drm/amd/amdgpu/mmhub_v1_8.c
index 7a1ff298417a..8d7267a013d2 100644
--- a/drivers/gpu/drm/amd/amdgpu/mmhub_v1_8.c
+++ b/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;
 }
-- 
2.17.1