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 31 #ifndef _TTM_EXECBUF_UTIL_H_ 32 #define _TTM_EXECBUF_UTIL_H_ 33 34 #include <dev/drm2/ttm/ttm_bo_api.h> 35 36 /** 37 * struct ttm_validate_buffer 38 * 39 * @head: list head for thread-private list. 40 * @bo: refcounted buffer object pointer. 41 * @reserved: Indicates whether @bo has been reserved for validation. 42 * @removed: Indicates whether @bo has been removed from lru lists. 43 * @put_count: Number of outstanding references on bo::list_kref. 44 * @old_sync_obj: Pointer to a sync object about to be unreferenced 45 */ 46 47 struct ttm_validate_buffer { 48 struct list_head head; 49 struct ttm_buffer_object *bo; 50 bool reserved; 51 bool removed; 52 int put_count; 53 void *old_sync_obj; 54 }; 55 56 /** 57 * function ttm_eu_backoff_reservation 58 * 59 * @list: thread private list of ttm_validate_buffer structs. 60 * 61 * Undoes all buffer validation reservations for bos pointed to by 62 * the list entries. 63 */ 64 65 extern void ttm_eu_backoff_reservation(struct list_head *list); 66 67 /** 68 * function ttm_eu_reserve_buffers 69 * 70 * @list: thread private list of ttm_validate_buffer structs. 71 * 72 * Tries to reserve bos pointed to by the list entries for validation. 73 * If the function returns 0, all buffers are marked as "unfenced", 74 * taken off the lru lists and are not synced for write CPU usage. 75 * 76 * If the function detects a deadlock due to multiple threads trying to 77 * reserve the same buffers in reverse order, all threads except one will 78 * back off and retry. This function may sleep while waiting for 79 * CPU write reservations to be cleared, and for other threads to 80 * unreserve their buffers. 81 * 82 * This function may return -ERESTART or -EAGAIN if the calling process 83 * receives a signal while waiting. In that case, no buffers on the list 84 * will be reserved upon return. 85 * 86 * Buffers reserved by this function should be unreserved by 87 * a call to either ttm_eu_backoff_reservation() or 88 * ttm_eu_fence_buffer_objects() when command submission is complete or 89 * has failed. 90 */ 91 92 extern int ttm_eu_reserve_buffers(struct list_head *list); 93 94 /** 95 * function ttm_eu_fence_buffer_objects. 96 * 97 * @list: thread private list of ttm_validate_buffer structs. 98 * @sync_obj: The new sync object for the buffers. 99 * 100 * This function should be called when command submission is complete, and 101 * it will add a new sync object to bos pointed to by entries on @list. 102 * It also unreserves all buffers, putting them on lru lists. 103 * 104 */ 105 106 extern void ttm_eu_fence_buffer_objects(struct list_head *list, void *sync_obj); 107 108 #endif 109