[PATCH] drm/ttm: update bulk move object of ghost BO

[JingWen Chen]

Acked-by: Jingwen Chen <Jingwen.Chen2 at amd.com>

still need confirmation from Christian

On 9/1/22 5:29 PM, ZhenGuo Yin wrote:
> [Why]
> Ghost BO is released with non-empty bulk move object. There is a
> warning trace:
> WARNING: CPU: 19 PID: 1582 at ttm/ttm_bo.c:366 ttm_bo_release+0x2e1/0x2f0 [amdttm]
> Call Trace:
>   amddma_resv_reserve_fences+0x10d/0x1f0 [amdkcl]
>   amdttm_bo_put+0x28/0x30 [amdttm]
>   amdttm_bo_move_accel_cleanup+0x126/0x200 [amdttm]
>   amdgpu_bo_move+0x1a8/0x770 [amdgpu]
>   ttm_bo_handle_move_mem+0xb0/0x140 [amdttm]
>   amdttm_bo_validate+0xbf/0x100 [amdttm]
>
> [How]
> The resource of ghost BO should be moved to LRU directly, instead of
> using bulk move. The bulk move object of ghost BO should set to NULL
> before function ttm_bo_move_to_lru_tail_unlocked.
>
> Fixed:·5b951e487fd6bf5f·("drm/ttm:·fix·bulk·move·handling·v2")
> Signed-off-by: ZhenGuo Yin <zhenguo.yin at amd.com>
> ---
>  drivers/gpu/drm/ttm/ttm_bo_util.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/gpu/drm/ttm/ttm_bo_util.c b/drivers/gpu/drm/ttm/ttm_bo_util.c
> index 1cbfb00c1d65..a90bbbd91910 100644
> --- a/drivers/gpu/drm/ttm/ttm_bo_util.c
> +++ b/drivers/gpu/drm/ttm/ttm_bo_util.c
> @@ -238,6 +238,7 @@ static int ttm_buffer_object_transfer(struct ttm_buffer_object *bo,
>  
>  	if (fbo->base.resource) {
>  		ttm_resource_set_bo(fbo->base.resource, &fbo->base);
> +		ttm_bo_set_bulk_move(&fbo->base, NULL);
>  		bo->resource = NULL;
>  	}
>