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| author | Thomas Hellström <thomas.hellstrom@linux.intel.com> | 2021-06-02 11:38:13 +0300 |
|---|---|---|
| committer | Thomas Hellström <thomas.hellstrom@linux.intel.com> | 2021-06-07 17:07:08 +0300 |
| commit | a3be8cd70fec2aa8913b59c9026031205c29df28 (patch) | |
| tree | 6b6bd93da399fd77d6ca54d4c045e73cf7a57c3a /include/drm | |
| parent | 053c57696cb99c35859e9e9cc58c7d00e434d956 (diff) | |
| download | linux-a3be8cd70fec2aa8913b59c9026031205c29df28.tar.xz | |
drm/ttm: Document and optimize ttm_bo_pipeline_gutting()
If the bo is idle when calling ttm_bo_pipeline_gutting(), we unnecessarily
create a ghost object and push it out to delayed destroy.
Fix this by adding a path for idle, and document the function.
Also avoid having the bo end up in a bad state vulnerable to user-space
triggered kernel BUGs if the call to ttm_tt_create() fails.
Finally reuse ttm_bo_pipeline_gutting() in ttm_bo_evict().
Cc: Christian König <christian.koenig@amd.com>
Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Link: https://lore.kernel.org/r/20210602083818.241793-7-thomas.hellstrom@linux.intel.com
Diffstat (limited to 'include/drm')
| -rw-r--r-- | include/drm/ttm/ttm_tt.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/include/drm/ttm/ttm_tt.h b/include/drm/ttm/ttm_tt.h index 3102059db726..818680c6a8ed 100644 --- a/include/drm/ttm/ttm_tt.h +++ b/include/drm/ttm/ttm_tt.h @@ -170,6 +170,19 @@ int ttm_tt_populate(struct ttm_device *bdev, struct ttm_tt *ttm, struct ttm_oper */ void ttm_tt_unpopulate(struct ttm_device *bdev, struct ttm_tt *ttm); +/** + * ttm_tt_mark_for_clear - Mark pages for clearing on populate. + * + * @ttm: Pointer to the ttm_tt structure + * + * Marks pages for clearing so that the next time the page vector is + * populated, the pages will be cleared. + */ +static inline void ttm_tt_mark_for_clear(struct ttm_tt *ttm) +{ + ttm->page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC; +} + void ttm_tt_mgr_init(unsigned long num_pages, unsigned long num_dma32_pages); struct ttm_kmap_iter *ttm_kmap_iter_tt_init(struct ttm_kmap_iter_tt *iter_tt, |