Re: [PATCH v2] drm/ttm: update bulk move object of ghost BO

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Am 06.09.22 um 10:46 schrieb ZhenGuo Yin:
[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.

v2: set bulk move to NULL manually if no resource associated with ghost BO

Fixed: 5b951e487fd6bf5f ("drm/ttm: fix bulk move handling v2")
Signed-off-by: ZhenGuo Yin <zhenguo.yin@xxxxxxx>

Reviewed-by: Christian König <christian.koenig@xxxxxxx>

Going to push that to drm-misc-fixes in a minute.

Thanks,
Christian.

---
  drivers/gpu/drm/ttm/ttm_bo_util.c | 3 +++
  1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/ttm/ttm_bo_util.c b/drivers/gpu/drm/ttm/ttm_bo_util.c
index 1cbfb00c1d65..57a27847206f 100644
--- a/drivers/gpu/drm/ttm/ttm_bo_util.c
+++ b/drivers/gpu/drm/ttm/ttm_bo_util.c
@@ -239,6 +239,9 @@ static int ttm_buffer_object_transfer(struct ttm_buffer_object *bo,
  	if (fbo->base.resource) {
  		ttm_resource_set_bo(fbo->base.resource, &fbo->base);
  		bo->resource = NULL;
+		ttm_bo_set_bulk_move(&fbo->base, NULL);
+	} else {
+		fbo->base.bulk_move = NULL;
  	}
dma_resv_init(&fbo->base.base._resv);




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