include/drm/ttm/ttm_execbuf_util.h

Source file repositories/reference/linux-study-clean/include/drm/ttm/ttm_execbuf_util.h

File Facts

System
Linux kernel
Corpus path
include/drm/ttm/ttm_execbuf_util.h
Extension
.h
Size
4439 bytes
Lines
120
Domain
Repository Root And Misc
Bucket
include
Inferred role
Repository Root And Misc: implementation source
Status
source implementation candidate

Why This File Exists

Top-level or miscellaneous repository surface. Use this as map coverage unless a later manual pass promotes the file into a deeper subsystem dossier.

Dependency Surface

Detected Declarations

Annotated Snippet

struct ttm_validate_buffer {
	struct list_head head;
	struct ttm_buffer_object *bo;
	unsigned int num_shared;
};

/**
 * ttm_eu_backoff_reservation
 *
 * @ticket:   ww_acquire_ctx from reserve call
 * @list:     thread private list of ttm_validate_buffer structs.
 *
 * Undoes all buffer validation reservations for bos pointed to by
 * the list entries.
 */
void ttm_eu_backoff_reservation(struct ww_acquire_ctx *ticket,
				struct list_head *list);

/**
 * ttm_eu_reserve_buffers
 *
 * @ticket:  [out] ww_acquire_ctx filled in by call, or NULL if only
 *           non-blocking reserves should be tried.
 * @list:    thread private list of ttm_validate_buffer structs.
 * @intr:    should the wait be interruptible
 * @dups:    [out] optional list of duplicates.
 *
 * Tries to reserve bos pointed to by the list entries for validation.
 * If the function returns 0, all buffers are marked as "unfenced",
 * taken off the lru lists and are not synced for write CPU usage.
 *
 * If the function detects a deadlock due to multiple threads trying to
 * reserve the same buffers in reverse order, all threads except one will
 * back off and retry. This function may sleep while waiting for
 * CPU write reservations to be cleared, and for other threads to
 * unreserve their buffers.
 *
 * If intr is set to true, this function may return -ERESTARTSYS if the
 * calling process receives a signal while waiting. In that case, no
 * buffers on the list will be reserved upon return.
 *
 * If dups is non NULL all buffers already reserved by the current thread
 * (e.g. duplicates) are added to this list, otherwise -EALREADY is returned
 * on the first already reserved buffer and all buffers from the list are
 * unreserved again.
 *
 * Buffers reserved by this function should be unreserved by
 * a call to either ttm_eu_backoff_reservation() or
 * ttm_eu_fence_buffer_objects() when command submission is complete or
 * has failed.
 */
int ttm_eu_reserve_buffers(struct ww_acquire_ctx *ticket,
			   struct list_head *list, bool intr,
			   struct list_head *dups);

/**
 * ttm_eu_fence_buffer_objects
 *
 * @ticket:      ww_acquire_ctx from reserve call
 * @list:        thread private list of ttm_validate_buffer structs.
 * @fence:       The new exclusive fence for the buffers.
 *
 * This function should be called when command submission is complete, and
 * it will add a new sync object to bos pointed to by entries on @list.
 * It also unreserves all buffers, putting them on lru lists.
 *
 */
void ttm_eu_fence_buffer_objects(struct ww_acquire_ctx *ticket,
				 struct list_head *list,
				 struct dma_fence *fence);

#endif

Annotation

Implementation Notes