[PATCH AUTOSEL 6.5 12/15] drm/amdgpu: Do not program VF copy regs in mmhub v1.8 under SRIOV (v2)

Sasha Levin
2023-11-22T15:36:18Z

From: Victor Lu <victorchengchi.lu@amd.com>

[ Upstream commit 0288603040c38ccfeb5342f34a52673366d90038 ]

MC_VM_AGP_* registers should not be programmed by guest driver.

v2: move early return outside of loop

Signed-off-by: Victor Lu <victorchengchi.lu@amd.com>
Reviewed-by: Samir Dhume <samir.dhume@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/gpu/drm/amd/amdgpu/mmhub_v1_8.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/mmhub_v1_8.c b/drivers/gpu/drm/amd/amdgpu/mmhub_v1_8.c
index 5e8b493f86995..e68ffc1b7a095 100644
--- a/drivers/gpu/drm/amd/amdgpu/mmhub_v1_8.c
+++ b/drivers/gpu/drm/amd/amdgpu/mmhub_v1_8.c
@@ -130,6 +130,9 @@ static void mmhub_v1_8_init_system_aperture_regs(struct amdgpu_device *adev)
uint64_t value;
int i;

+ if (amdgpu_sriov_vf(adev))
+ return;
+
inst_mask = adev->aid_mask;
for_each_inst(i, inst_mask) {
/* Program the AGP BAR */
@@ -139,9 +142,6 @@ static void mmhub_v1_8_init_system_aperture_regs(struct amdgpu_device *adev)
WREG32_SOC15(MMHUB, i, regMC_VM_AGP_TOP,
adev->gmc.agp_end >> 24);

- if (amdgpu_sriov_vf(adev))
- return;
-
/* Program the system aperture low logical page number. */
WREG32_SOC15(MMHUB, i, regMC_VM_SYSTEM_APERTURE_LOW_ADDR,
min(adev->gmc.fb_start, adev->gmc.agp_start) >> 18);
--
2.42.0