3  * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
20  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
28  * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
41 /* Default number of pre-faulted pages in the TTM fault handler */
62  * but they cannot be accessed from user-space. For kernel-only use.
166  * @interruptible: Sleep interruptible if sleeping.
189  * ttm_bo_get - reference a struct ttm_buffer_object
195 	kref_get(&bo->kref);  in ttm_bo_get()
199  * ttm_bo_get_unless_zero - reference a struct ttm_buffer_object unless
211 	if (!kref_get_unless_zero(&bo->kref))  in ttm_bo_get_unless_zero()
220  * @interruptible: Sleep interruptible if waiting.
221  * @no_wait: Don't sleep while trying to reserve, rather return -EBUSY.
229  * -EDEADLK: The reservation may cause a deadlock.
232  * -ERESTARTSYS: A wait for the buffer to become unreserved was interrupted by
233  * a signal. Release all buffer reservations and return to user-space.
234  * -EBUSY: The function needed to sleep, but @no_wait was true
235  * -EALREADY: Bo already reserved using @ticket. This error code will only
248 			return -EBUSY;  in ttm_bo_reserve()
250 		success = dma_resv_trylock(bo->base.resv);  in ttm_bo_reserve()
251 		return success ? 0 : -EBUSY;  in ttm_bo_reserve()
255 		ret = dma_resv_lock_interruptible(bo->base.resv, ticket);  in ttm_bo_reserve()
257 		ret = dma_resv_lock(bo->base.resv, ticket);  in ttm_bo_reserve()
258 	if (ret == -EINTR)  in ttm_bo_reserve()
259 		return -ERESTARTSYS;  in ttm_bo_reserve()
266  * @interruptible: Sleep interruptible if waiting.
267  * @sequence: Set (@bo)->sequence to this value after lock
269  * This is called after ttm_bo_reserve returns -EAGAIN and we backed off
278 		int ret = dma_resv_lock_slow_interruptible(bo->base.resv,  in ttm_bo_reserve_slowpath()
280 		if (ret == -EINTR)  in ttm_bo_reserve_slowpath()
281 			ret = -ERESTARTSYS;  in ttm_bo_reserve_slowpath()
284 	dma_resv_lock_slow(bo->base.resv, ticket);  in ttm_bo_reserve_slowpath()
293 	spin_lock(&bo->bdev->lru_lock);  in ttm_bo_move_to_lru_tail_unlocked()
295 	spin_unlock(&bo->bdev->lru_lock);  in ttm_bo_move_to_lru_tail_unlocked()
301 	WARN_ON(bo->resource);  in ttm_bo_assign_mem()
302 	bo->resource = new_mem;  in ttm_bo_assign_mem()
315 	ttm_resource_free(bo, &bo->resource);  in ttm_bo_move_null()
329 	dma_resv_unlock(bo->base.resv);  in ttm_bo_unreserve()
335  * @map: A struct ttm_bo_kmap_obj returned from ttm_bo_kmap.
337  * virtual map is io memory, 0 if normal memory.
343 static inline void *ttm_kmap_obj_virtual(struct ttm_bo_kmap_obj *map,  in ttm_kmap_obj_virtual()  argument
346 	*is_iomem = !!(map->bo_kmap_type & TTM_BO_MAP_IOMEM_MASK);  in ttm_kmap_obj_virtual()
347 	return map->virtual;  in ttm_kmap_obj_virtual()
371 		unsigned long num_pages, struct ttm_bo_kmap_obj *map);
372 void ttm_bo_kunmap(struct ttm_bo_kmap_obj *map);
373 int ttm_bo_vmap(struct ttm_buffer_object *bo, struct iosys_map *map);
374 void ttm_bo_vunmap(struct ttm_buffer_object *bo, struct iosys_map *map);