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drm/amdgpu: disable GFX ring and disable PQ wptr in hw_fini 

otherwise there will be DMAR reading error comes out from CP since
GFX is still alive and CPC's WPTR_POLL is still enabled, which would
lead to DMAR read error.

fix:
we can hault CPG after hw_fini, but cannot halt CPC becaues KIQ
stil need to be alive to let RLCV invoke, but its WPTR_POLL could
be disabled.

Signed-off-by: Monk Liu <Monk.Liu@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Monk Liu 2018-01-29 19:24:32 +08:00 committed by Alex Deucher
parent bffe07b8b9
commit 9f0178fb67
1 changed files with 7 additions and 1 deletions
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8
drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
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@ -2961,7 +2961,13 @@ static int gfx_v9_0_hw_fini(void *handle)
gfx_v9_0_kcq_disable(&adev->gfx.kiq.ring, &adev->gfx.compute_ring[i]);
if (amdgpu_sriov_vf(adev)) {
pr_debug("For SRIOV client, shouldn't do anything.\n");
gfx_v9_0_cp_gfx_enable(adev, false);
/* must disable polling for SRIOV when hw finished, otherwise
* CPC engine may still keep fetching WB address which is already
* invalid after sw finished and trigger DMAR reading error in
* hypervisor side.
*/
WREG32_FIELD15(GC, 0, CP_PQ_WPTR_POLL_CNTL, EN, 0);
return 0;
}
gfx_v9_0_cp_enable(adev, false);