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| Rev | Author | Line No. | Line |
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| 3391 | Serge | 1 | /************************************************************************** |
| 2 | * |
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| 3 | * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA |
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| 4 | * All Rights Reserved. |
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| 5 | * |
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| 6 | * Permission is hereby granted, free of charge, to any person obtaining a |
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| 7 | * copy of this software and associated documentation files (the |
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| 8 | * "Software"), to deal in the Software without restriction, including |
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| 9 | * without limitation the rights to use, copy, modify, merge, publish, |
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| 10 | * distribute, sub license, and/or sell copies of the Software, and to |
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| 11 | * permit persons to whom the Software is furnished to do so, subject to |
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| 12 | * the following conditions: |
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| 13 | * |
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| 14 | * The above copyright notice and this permission notice (including the |
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| 15 | * next paragraph) shall be included in all copies or substantial portions |
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| 16 | * of the Software. |
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| 17 | * |
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| 18 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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| 19 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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| 20 | * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL |
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| 21 | * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, |
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| 22 | * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR |
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| 23 | * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE |
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| 24 | * USE OR OTHER DEALINGS IN THE SOFTWARE. |
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| 25 | * |
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| 26 | **************************************************************************/ |
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| 27 | /* |
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| 28 | * Authors: Thomas Hellstrom |
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| 29 | */ |
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| 30 | |||
| 31 | #ifndef _TTM_EXECBUF_UTIL_H_ |
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| 32 | #define _TTM_EXECBUF_UTIL_H_ |
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| 33 | |||
| 34 | #include |
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| 35 | #include |
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| 36 | |||
| 37 | /** |
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| 38 | * struct ttm_validate_buffer |
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| 39 | * |
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| 40 | * @head: list head for thread-private list. |
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| 41 | * @bo: refcounted buffer object pointer. |
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| 5270 | serge | 42 | * @shared: should the fence be added shared? |
| 3391 | Serge | 43 | */ |
| 44 | |||
| 45 | struct ttm_validate_buffer { |
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| 46 | struct list_head head; |
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| 47 | struct ttm_buffer_object *bo; |
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| 5270 | serge | 48 | bool shared; |
| 3391 | Serge | 49 | }; |
| 50 | |||
| 51 | /** |
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| 52 | * function ttm_eu_backoff_reservation |
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| 53 | * |
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| 4065 | Serge | 54 | * @ticket: ww_acquire_ctx from reserve call |
| 3391 | Serge | 55 | * @list: thread private list of ttm_validate_buffer structs. |
| 56 | * |
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| 57 | * Undoes all buffer validation reservations for bos pointed to by |
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| 58 | * the list entries. |
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| 59 | */ |
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| 60 | |||
| 4065 | Serge | 61 | extern void ttm_eu_backoff_reservation(struct ww_acquire_ctx *ticket, |
| 62 | struct list_head *list); |
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| 3391 | Serge | 63 | |
| 64 | /** |
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| 65 | * function ttm_eu_reserve_buffers |
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| 66 | * |
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| 4568 | Serge | 67 | * @ticket: [out] ww_acquire_ctx filled in by call, or NULL if only |
| 68 | * non-blocking reserves should be tried. |
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| 3391 | Serge | 69 | * @list: thread private list of ttm_validate_buffer structs. |
| 5270 | serge | 70 | * @intr: should the wait be interruptible |
| 71 | * @dups: [out] optional list of duplicates. |
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| 3391 | Serge | 72 | * |
| 73 | * Tries to reserve bos pointed to by the list entries for validation. |
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| 74 | * If the function returns 0, all buffers are marked as "unfenced", |
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| 75 | * taken off the lru lists and are not synced for write CPU usage. |
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| 76 | * |
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| 77 | * If the function detects a deadlock due to multiple threads trying to |
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| 78 | * reserve the same buffers in reverse order, all threads except one will |
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| 79 | * back off and retry. This function may sleep while waiting for |
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| 80 | * CPU write reservations to be cleared, and for other threads to |
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| 81 | * unreserve their buffers. |
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| 82 | * |
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| 5270 | serge | 83 | * If intr is set to true, this function may return -ERESTARTSYS if the |
| 84 | * calling process receives a signal while waiting. In that case, no |
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| 85 | * buffers on the list will be reserved upon return. |
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| 3391 | Serge | 86 | * |
| 5270 | serge | 87 | * If dups is non NULL all buffers already reserved by the current thread |
| 88 | * (e.g. duplicates) are added to this list, otherwise -EALREADY is returned |
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| 89 | * on the first already reserved buffer and all buffers from the list are |
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| 90 | * unreserved again. |
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| 91 | * |
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| 3391 | Serge | 92 | * Buffers reserved by this function should be unreserved by |
| 93 | * a call to either ttm_eu_backoff_reservation() or |
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| 94 | * ttm_eu_fence_buffer_objects() when command submission is complete or |
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| 95 | * has failed. |
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| 96 | */ |
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| 97 | |||
| 4065 | Serge | 98 | extern int ttm_eu_reserve_buffers(struct ww_acquire_ctx *ticket, |
| 5270 | serge | 99 | struct list_head *list, bool intr, |
| 100 | struct list_head *dups); |
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| 3391 | Serge | 101 | |
| 102 | /** |
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| 103 | * function ttm_eu_fence_buffer_objects. |
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| 104 | * |
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| 4065 | Serge | 105 | * @ticket: ww_acquire_ctx from reserve call |
| 3391 | Serge | 106 | * @list: thread private list of ttm_validate_buffer structs. |
| 5270 | serge | 107 | * @fence: The new exclusive fence for the buffers. |
| 3391 | Serge | 108 | * |
| 109 | * This function should be called when command submission is complete, and |
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| 110 | * it will add a new sync object to bos pointed to by entries on @list. |
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| 111 | * It also unreserves all buffers, putting them on lru lists. |
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| 112 | * |
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| 113 | */ |
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| 114 | |||
| 4065 | Serge | 115 | extern void ttm_eu_fence_buffer_objects(struct ww_acquire_ctx *ticket, |
| 5270 | serge | 116 | struct list_head *list, |
| 117 | struct fence *fence); |
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| 3391 | Serge | 118 | |
| 119 | #endif |