Commit bcca6298 authored by Monk Liu's avatar Monk Liu Committed by Alex Deucher
Browse files

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: default avatarMonk Liu <Monk.Liu@amd.com>
Reviewed-by: default avatarEmily Deng <Emily.Deng@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 5a58abf5

drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c

+4 −0
Original line number Diff line number Diff line
@@ -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);