[PATCH] drm/amdgpu: Avoid extra evict-restore process.

[Philip Yang]

On 2025-07-08 16:14, Gang Ba wrote:
> If vm belongs to another process, this is fclose after fork,
> wait may enable signaling KFD eviction fence and cause parent process queue evicted.
>
> Signed-off-by: Gang Ba <Gang.Ba at amd.com>
> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 7 +++++++
>   1 file changed, 7 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> index f042372d9f2e..8ee1b7e62dee 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> @@ -2410,6 +2410,13 @@ void amdgpu_vm_adjust_size(struct amdgpu_device *adev, uint32_t min_vm_size,
>    */
>   long amdgpu_vm_wait_idle(struct amdgpu_vm *vm, long timeout)
>   {
> +	/* If vm belongs to another process, this is fclose after fork,
> +	 * wait may enable signaling KFD eviction fence and cause parent process queue evicted.
> +	 */
> +	if (vm->task_info->tgid &&
> +	    vm->task_info->tgid != current->group_leader->pid)
> +	      return 0;
> +

Only check this for KFD vm, in case this may cause gfx test regression.

     if (vm->is_compute_context && vm->task_info->tgid != 
current->group_leader->pid)

           return 0;


Regards,

Philip

>   	timeout = dma_resv_wait_timeout(vm->root.bo->tbo.base.resv,
>   					DMA_RESV_USAGE_BOOKKEEP,
>   					true, timeout);