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drm/amd/amdgpu: Avoid writing GMC registers under sriov in gmc9

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[Why]
For Vega10, disabling gart of gfxhub could mess up KIQ and PSP
under sriov mode, and lead to DMAR on host side.

[How]
Skip writing GMC registers under sriov.

Signed-off-by: YuBiao Wang <YuBiao.Wang@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
YuBiao Wang 2021-11-04 10:50:41 +08:00 committed by Alex Deucher
parent e9c76719c1
commit c4fc13b581
1 changed files with 4 additions and 0 deletions
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4
drivers/gpu/drm/amd/amdgpu/gfxhub_v1_0.c
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@ -348,6 +348,10 @@ static void gfxhub_v1_0_gart_disable(struct amdgpu_device *adev)
WREG32_SOC15_OFFSET(GC, 0, mmVM_CONTEXT0_CNTL,
i * hub->ctx_distance, 0);
if (amdgpu_sriov_vf(adev))
/* Avoid write to GMC registers */
return;
/* Setup TLB control */
tmp = RREG32_SOC15(GC, 0, mmMC_VM_MX_L1_TLB_CNTL);
tmp = REG_SET_FIELD(tmp, MC_VM_MX_L1_TLB_CNTL, ENABLE_L1_TLB, 0);