From bcca6298069435fa7f23ab98f4cb635fcbd3bc20 Mon Sep 17 00:00:00 2001 From: Monk Liu Date: Mon, 10 Aug 2020 14:12:06 +0800 Subject: [PATCH] drm/amdgpu: fix reload KMD hang on GFX10 KIQ GFX10 KIQ will hang if we try below steps: modprobe amdgpu rmmod amdgpu modprobe amdgpu sched_hw_submission=4 Due to KIQ is always living there even after KMD unloaded thus when doing the realod KIQ will crash upon its register being programed by different values with the previous loading (the config like HQD addr, ring size, is easily changed if we alter the sched_hw_submission) the fix is we must inactive KIQ first before touching any of its registgers Signed-off-by: Monk Liu Reviewed-by: Emily Deng Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c index 622f442..0702c94 100644 --- a/drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c +++ b/drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c @@ -6435,6 +6435,10 @@ static int gfx_v10_0_kiq_init_register(struct amdgpu_ring *ring) struct v10_compute_mqd *mqd = ring->mqd_ptr; int j; + /* inactivate the queue */ + if (amdgpu_sriov_vf(adev)) + WREG32_SOC15(GC, 0, mmCP_HQD_ACTIVE, 0); + /* disable wptr polling */ WREG32_FIELD15(GC, 0, CP_PQ_WPTR_POLL_CNTL, EN, 0); -- 2.7.4