VF uses KIQ to access registers. When VM fault occurs, the driver can't get back the fence of KIQ submission and runs into CPU soft lockup.
Signed-off-by: Pixel Ding <[email protected]> --- drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c index 7669b32..ff4fb37 100644 --- a/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c +++ b/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c @@ -1237,6 +1237,11 @@ static int gmc_v8_0_process_interrupt(struct amdgpu_device *adev, { u32 addr, status, mc_client; + if (amdgpu_sriov_vf(adev)) { + dev_err(adev->dev, "GPU fault detected on VF, can't access VM registers\n"); + return 0; + } + addr = RREG32(mmVM_CONTEXT1_PROTECTION_FAULT_ADDR); status = RREG32(mmVM_CONTEXT1_PROTECTION_FAULT_STATUS); mc_client = RREG32(mmVM_CONTEXT1_PROTECTION_FAULT_MCCLIENT); -- 2.7.4 _______________________________________________ amd-gfx mailing list [email protected] https://lists.freedesktop.org/mailman/listinfo/amd-gfx
