[PATCH AUTOSEL 6.10 097/121] drm/amdgpu: Fix register access violation

Sasha Levin
2024-08-01T00:17:21Z

From: Hawking Zhang <Hawking.Zhang@amd.com>

[ Upstream commit 9da0f7736763aa0fbf63bb15060c6827135f3f67 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
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 77df8c9cbad2f..9e10e552952e1 100644
--- a/drivers/gpu/drm/amd/amdgpu/gfxhub_v1_2.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfxhub_v1_2.c
@@ -627,9 +627,11 @@ 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 c4ec1358f3aa6..67f36a79c6f41 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
@@ -671,7 +671,8 @@ 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 7a1ff298417ab..8d7267a013d24 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;
}
--
2.43.0