name : ttm_execbuf_util.h /************************************************************************** * * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA * All Rights Reserved. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the * "Software"), to deal in the Software without restriction, including * without limitation the rights to use, copy, modify, merge, publish, * distribute, sub license, and/or sell copies of the Software, and to * permit persons to whom the Software is furnished to do so, subject to * the following conditions: * * The above copyright notice and this permission notice (including the * next paragraph) shall be included in all copies or substantial portions * of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE * USE OR OTHER DEALINGS IN THE SOFTWARE. * **************************************************************************/ /* * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com> */ #ifndef _TTM_EXECBUF_UTIL_H_ #define _TTM_EXECBUF_UTIL_H_ #include <linux/list.h> struct ww_acquire_ctx; struct dma_fence; struct ttm_buffer_object; /** * struct ttm_validate_buffer * * @head: list head for thread-private list. * @bo: refcounted buffer object pointer. * @num_shared: How many shared fences we want to add. */ struct ttm_validate_buffer { struct list_head head; struct ttm_buffer_object *bo; unsigned int num_shared; }; /** * function 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); /** * function 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. * @del_lru: true if BOs should be removed from the LRU. * * 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); /** * function 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