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drm/amdgpu: Wait for GFX idle before PTL state transition

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Ensure GFX engine is idle before switching PTL state to prevent
register access violations and CP hang. This addresses the race
condition where in-flight GPU commands could conflict with PTL
state changes.

Signed-off-by: Perry Yuan <perry.yuan@amd.com>
Reviewed-by: Yifan Zhang <yifan1.zhang@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Perry Yuan 2026-02-09 00:42:12 +08:00 committed by Alex Deucher
parent d31098cb31
commit 82cfe59ba4
1 changed files with 5 additions and 0 deletions
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5
drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
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@ -1792,6 +1792,11 @@ static int kfd_ptl_control(struct kfd_process_device *pdd, bool enable)
if (adev->kfd.init_complete)
amdgpu_amdkfd_stop_sched(adev, pdd->dev->node_id);
/* Wait for GFX to be idle before PTL operation */
ret = amdgpu_device_ip_wait_for_idle(adev, AMD_IP_BLOCK_TYPE_GFX);
if (ret)
return -ETIMEDOUT;
ret = pdd->dev->kfd2kgd->ptl_ctrl(adev, PSP_PTL_PERF_MON_SET,
&ptl_state,
&pref_format1,