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1/**************************************************************************2 *3 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA4 * All Rights Reserved.5 *6 * Permission is hereby granted, free of charge, to any person obtaining a7 * copy of this software and associated documentation files (the8 * "Software"), to deal in the Software without restriction, including9 * without limitation the rights to use, copy, modify, merge, publish,10 * distribute, sub license, and/or sell copies of the Software, and to11 * permit persons to whom the Software is furnished to do so, subject to12 * the following conditions:13 *14 * The above copyright notice and this permission notice (including the15 * next paragraph) shall be included in all copies or substantial portions16 * of the Software.17 *18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,20 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL21 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,22 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR23 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE24 * USE OR OTHER DEALINGS IN THE SOFTWARE.25 *26 **************************************************************************/27/*28 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>29 */30 31#ifndef _TTM_EXECBUF_UTIL_H_32#define _TTM_EXECBUF_UTIL_H_33 34#include <linux/list.h>35 36struct ww_acquire_ctx;37struct dma_fence;38struct ttm_buffer_object;39 40/**41 * struct ttm_validate_buffer42 *43 * @head: list head for thread-private list.44 * @bo: refcounted buffer object pointer.45 * @num_shared: How many shared fences we want to add.46 */47 48struct ttm_validate_buffer {49 struct list_head head;50 struct ttm_buffer_object *bo;51 unsigned int num_shared;52};53 54/**55 * ttm_eu_backoff_reservation56 *57 * @ticket: ww_acquire_ctx from reserve call58 * @list: thread private list of ttm_validate_buffer structs.59 *60 * Undoes all buffer validation reservations for bos pointed to by61 * the list entries.62 */63void ttm_eu_backoff_reservation(struct ww_acquire_ctx *ticket,64 struct list_head *list);65 66/**67 * ttm_eu_reserve_buffers68 *69 * @ticket: [out] ww_acquire_ctx filled in by call, or NULL if only70 * non-blocking reserves should be tried.71 * @list: thread private list of ttm_validate_buffer structs.72 * @intr: should the wait be interruptible73 * @dups: [out] optional list of duplicates.74 *75 * Tries to reserve bos pointed to by the list entries for validation.76 * If the function returns 0, all buffers are marked as "unfenced",77 * taken off the lru lists and are not synced for write CPU usage.78 *79 * If the function detects a deadlock due to multiple threads trying to80 * reserve the same buffers in reverse order, all threads except one will81 * back off and retry. This function may sleep while waiting for82 * CPU write reservations to be cleared, and for other threads to83 * unreserve their buffers.84 *85 * If intr is set to true, this function may return -ERESTARTSYS if the86 * calling process receives a signal while waiting. In that case, no87 * buffers on the list will be reserved upon return.88 *89 * If dups is non NULL all buffers already reserved by the current thread90 * (e.g. duplicates) are added to this list, otherwise -EALREADY is returned91 * on the first already reserved buffer and all buffers from the list are92 * unreserved again.93 *94 * Buffers reserved by this function should be unreserved by95 * a call to either ttm_eu_backoff_reservation() or96 * ttm_eu_fence_buffer_objects() when command submission is complete or97 * has failed.98 */99int ttm_eu_reserve_buffers(struct ww_acquire_ctx *ticket,100 struct list_head *list, bool intr,101 struct list_head *dups);102 103/**104 * ttm_eu_fence_buffer_objects105 *106 * @ticket: ww_acquire_ctx from reserve call107 * @list: thread private list of ttm_validate_buffer structs.108 * @fence: The new exclusive fence for the buffers.109 *110 * This function should be called when command submission is complete, and111 * it will add a new sync object to bos pointed to by entries on @list.112 * It also unreserves all buffers, putting them on lru lists.113 *114 */115void ttm_eu_fence_buffer_objects(struct ww_acquire_ctx *ticket,116 struct list_head *list,117 struct dma_fence *fence);118 119#endif120