Thomas Hellstrom | c078aa2 | 2009-12-06 21:46:26 +0100 | [diff] [blame] | 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 | |
David Howells | a1ce392 | 2012-10-02 18:01:25 +0100 | [diff] [blame] | 34 | #include <ttm/ttm_bo_api.h> |
Thomas Hellstrom | c078aa2 | 2009-12-06 21:46:26 +0100 | [diff] [blame] | 35 | #include <linux/list.h> |
| 36 | |
| 37 | /** |
| 38 | * struct ttm_validate_buffer |
| 39 | * |
| 40 | * @head: list head for thread-private list. |
| 41 | * @bo: refcounted buffer object pointer. |
| 42 | * @new_sync_obj_arg: New sync_obj_arg for @bo, to be used once |
| 43 | * adding a new sync object. |
Dave Airlie | d6ea888 | 2010-11-22 13:24:40 +1000 | [diff] [blame] | 44 | * @reserved: Indicates whether @bo has been reserved for validation. |
| 45 | * @removed: Indicates whether @bo has been removed from lru lists. |
| 46 | * @put_count: Number of outstanding references on bo::list_kref. |
Thomas Hellstrom | 95762c2 | 2010-11-17 12:28:30 +0000 | [diff] [blame] | 47 | * @old_sync_obj: Pointer to a sync object about to be unreferenced |
Thomas Hellstrom | c078aa2 | 2009-12-06 21:46:26 +0100 | [diff] [blame] | 48 | */ |
| 49 | |
| 50 | struct ttm_validate_buffer { |
| 51 | struct list_head head; |
| 52 | struct ttm_buffer_object *bo; |
| 53 | void *new_sync_obj_arg; |
| 54 | bool reserved; |
Dave Airlie | d6ea888 | 2010-11-22 13:24:40 +1000 | [diff] [blame] | 55 | bool removed; |
| 56 | int put_count; |
Thomas Hellstrom | 95762c2 | 2010-11-17 12:28:30 +0000 | [diff] [blame] | 57 | void *old_sync_obj; |
Thomas Hellstrom | c078aa2 | 2009-12-06 21:46:26 +0100 | [diff] [blame] | 58 | }; |
| 59 | |
| 60 | /** |
| 61 | * function ttm_eu_backoff_reservation |
| 62 | * |
| 63 | * @list: thread private list of ttm_validate_buffer structs. |
| 64 | * |
| 65 | * Undoes all buffer validation reservations for bos pointed to by |
| 66 | * the list entries. |
| 67 | */ |
| 68 | |
| 69 | extern void ttm_eu_backoff_reservation(struct list_head *list); |
| 70 | |
| 71 | /** |
| 72 | * function ttm_eu_reserve_buffers |
| 73 | * |
| 74 | * @list: thread private list of ttm_validate_buffer structs. |
Thomas Hellstrom | c078aa2 | 2009-12-06 21:46:26 +0100 | [diff] [blame] | 75 | * |
| 76 | * Tries to reserve bos pointed to by the list entries for validation. |
| 77 | * If the function returns 0, all buffers are marked as "unfenced", |
| 78 | * taken off the lru lists and are not synced for write CPU usage. |
| 79 | * |
| 80 | * If the function detects a deadlock due to multiple threads trying to |
| 81 | * reserve the same buffers in reverse order, all threads except one will |
| 82 | * back off and retry. This function may sleep while waiting for |
| 83 | * CPU write reservations to be cleared, and for other threads to |
| 84 | * unreserve their buffers. |
| 85 | * |
| 86 | * This function may return -ERESTART or -EAGAIN if the calling process |
| 87 | * receives a signal while waiting. In that case, no buffers on the list |
| 88 | * will be reserved upon return. |
| 89 | * |
| 90 | * Buffers reserved by this function should be unreserved by |
| 91 | * a call to either ttm_eu_backoff_reservation() or |
| 92 | * ttm_eu_fence_buffer_objects() when command submission is complete or |
| 93 | * has failed. |
| 94 | */ |
| 95 | |
Thomas Hellstrom | 6570596 | 2010-11-17 12:28:31 +0000 | [diff] [blame] | 96 | extern int ttm_eu_reserve_buffers(struct list_head *list); |
Thomas Hellstrom | c078aa2 | 2009-12-06 21:46:26 +0100 | [diff] [blame] | 97 | |
| 98 | /** |
| 99 | * function ttm_eu_fence_buffer_objects. |
| 100 | * |
| 101 | * @list: thread private list of ttm_validate_buffer structs. |
| 102 | * @sync_obj: The new sync object for the buffers. |
| 103 | * |
| 104 | * This function should be called when command submission is complete, and |
| 105 | * it will add a new sync object to bos pointed to by entries on @list. |
| 106 | * It also unreserves all buffers, putting them on lru lists. |
| 107 | * |
| 108 | */ |
| 109 | |
| 110 | extern void ttm_eu_fence_buffer_objects(struct list_head *list, void *sync_obj); |
| 111 | |
| 112 | #endif |