1 /************************************************************************** 2 * 3 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA 4 * All Rights Reserved. 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a 7 * copy of this software and associated documentation files (the 8 * "Software"), to deal in the Software without restriction, including 9 * without limitation the rights to use, copy, modify, merge, publish, 10 * distribute, sub license, and/or sell copies of the Software, and to 11 * permit persons to whom the Software is furnished to do so, subject to 12 * the following conditions: 13 * 14 * The above copyright notice and this permission notice (including the 15 * next paragraph) shall be included in all copies or substantial portions 16 * of the Software. 17 * 18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 20 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL 21 * 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 OR 23 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE 24 * USE OR OTHER DEALINGS IN THE SOFTWARE. 25 * 26 **************************************************************************/ 27 /* 28 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com> 29 */ 30 /* $FreeBSD: head/sys/dev/drm2/ttm/ttm_execbuf_util.h 247835 2013-03-05 09:49:34Z kib $ */ 31 32 #ifndef _TTM_EXECBUF_UTIL_H_ 33 #define _TTM_EXECBUF_UTIL_H_ 34 35 #include <drm/ttm/ttm_bo_api.h> 36 #include <linux/reservation.h> 37 38 /** 39 * struct ttm_validate_buffer 40 * 41 * @head: list head for thread-private list. 42 * @bo: refcounted buffer object pointer. 43 * @reserved: Indicates whether @bo has been reserved for validation. 44 * @removed: Indicates whether @bo has been removed from lru lists. 45 * @put_count: Number of outstanding references on bo::list_kref. 46 * @old_sync_obj: Pointer to a sync object about to be unreferenced 47 */ 48 49 struct ttm_validate_buffer { 50 struct list_head head; 51 struct ttm_buffer_object *bo; 52 bool reserved; 53 bool removed; 54 int put_count; 55 void *old_sync_obj; 56 }; 57 58 /** 59 * function ttm_eu_backoff_reservation 60 * 61 * @ticket: ww_acquire_ctx from reserve call 62 * @list: thread private list of ttm_validate_buffer structs. 63 * 64 * Undoes all buffer validation reservations for bos pointed to by 65 * the list entries. 66 */ 67 68 extern void ttm_eu_backoff_reservation(struct ww_acquire_ctx *ticket, 69 struct list_head *list); 70 71 /** 72 * function ttm_eu_reserve_buffers 73 * 74 * @ticket: [out] ww_acquire_ctx returned by call. 75 * @list: thread private list of ttm_validate_buffer structs. 76 * 77 * Tries to reserve bos pointed to by the list entries for validation. 78 * If the function returns 0, all buffers are marked as "unfenced", 79 * taken off the lru lists and are not synced for write CPU usage. 80 * 81 * If the function detects a deadlock due to multiple threads trying to 82 * reserve the same buffers in reverse order, all threads except one will 83 * back off and retry. This function may sleep while waiting for 84 * CPU write reservations to be cleared, and for other threads to 85 * unreserve their buffers. 86 * 87 * This function may return -ERESTART or -EAGAIN if the calling process 88 * receives a signal while waiting. In that case, no buffers on the list 89 * will be reserved upon return. 90 * 91 * Buffers reserved by this function should be unreserved by 92 * a call to either ttm_eu_backoff_reservation() or 93 * ttm_eu_fence_buffer_objects() when command submission is complete or 94 * has failed. 95 */ 96 97 extern int ttm_eu_reserve_buffers(struct ww_acquire_ctx *ticket, 98 struct list_head *list); 99 100 /** 101 * function ttm_eu_fence_buffer_objects. 102 * 103 * @ticket: ww_acquire_ctx from reserve call 104 * @list: thread private list of ttm_validate_buffer structs. 105 * @sync_obj: The new sync object for the buffers. 106 * 107 * This function should be called when command submission is complete, and 108 * it will add a new sync object to bos pointed to by entries on @list. 109 * It also unreserves all buffers, putting them on lru lists. 110 * 111 */ 112 113 extern void ttm_eu_fence_buffer_objects(struct ww_acquire_ctx *ticket, 114 struct list_head *list, void *sync_obj); 115 116 #endif 117