| 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 | |
| 28 | * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
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| 29 |
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| 30 |
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| 31 | #ifndef _TTM_EXECBUF_UTIL_H_
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| 32 | #define _TTM_EXECBUF_UTIL_H_
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| 33 |
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| 34 | #include <linux/list.h>
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| 35 |
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| 36 | struct ww_acquire_ctx;
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| 37 | struct dma_fence;
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| 38 | struct ttm_buffer_object;
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| 39 |
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| 40 | |
| 41 | * struct ttm_validate_buffer
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| 42 | *
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| 43 | * @head: list head for thread-private list.
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| 44 | * @bo: refcounted buffer object pointer.
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| 45 | * @num_shared: How many shared fences we want to add.
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| 46 |
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| 47 |
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| 48 | struct ttm_validate_buffer {
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| 49 | struct list_head head;
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| 50 | struct ttm_buffer_object *bo;
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| 51 | unsigned int num_shared;
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| 52 | };
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| 53 |
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| 54 | |
| 55 | * ttm_eu_backoff_reservation
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| 56 | *
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| 57 | * @ticket: ww_acquire_ctx from reserve call
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| 58 | * @list: thread private list of ttm_validate_buffer structs.
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| 59 | *
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| 60 | * Undoes all buffer validation reservations for bos pointed to by
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| 61 | * the list entries.
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| 62 |
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| 63 | void ttm_eu_backoff_reservation(struct ww_acquire_ctx *ticket,
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| 64 | struct list_head *list);
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| 65 |
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| 66 | |
| 67 | * ttm_eu_reserve_buffers
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| 68 | *
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| 69 | * @ticket: [out] ww_acquire_ctx filled in by call, or NULL if only
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| 70 | * non-blocking reserves should be tried.
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| 71 | * @list: thread private list of ttm_validate_buffer structs.
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| 72 | * @intr: should the wait be interruptible
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| 73 | * @dups: [out] optional list of duplicates.
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| 74 | *
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| 75 | * Tries to reserve bos pointed to by the list entries for validation.
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| 76 | * If the function returns 0, all buffers are marked as "unfenced",
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| 77 | * taken off the lru lists and are not synced for write CPU usage.
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| 78 | *
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| 79 | * If the function detects a deadlock due to multiple threads trying to
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| 80 | * reserve the same buffers in reverse order, all threads except one will
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| 81 | * back off and retry. This function may sleep while waiting for
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| 82 | * CPU write reservations to be cleared, and for other threads to
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| 83 | * unreserve their buffers.
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| 84 | *
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| 85 | * If intr is set to true, this function may return -ERESTARTSYS if the
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| 86 | * calling process receives a signal while waiting. In that case, no
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| 87 | * buffers on the list will be reserved upon return.
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| 88 | *
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| 89 | * If dups is non NULL all buffers already reserved by the current thread
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| 90 | * (e.g. duplicates) are added to this list, otherwise -EALREADY is returned
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| 91 | * on the first already reserved buffer and all buffers from the list are
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| 92 | * unreserved again.
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| 93 | *
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| 94 | * Buffers reserved by this function should be unreserved by
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| 95 | * a call to either ttm_eu_backoff_reservation() or
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| 96 | * ttm_eu_fence_buffer_objects() when command submission is complete or
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| 97 | * has failed.
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| 98 |
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| 99 | int ttm_eu_reserve_buffers(struct ww_acquire_ctx *ticket,
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| 100 | struct list_head *list, bool intr,
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| 101 | struct list_head *dups);
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| 102 |
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| 103 | |
| 104 | * ttm_eu_fence_buffer_objects
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| 105 | *
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| 106 | * @ticket: ww_acquire_ctx from reserve call
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| 107 | * @list: thread private list of ttm_validate_buffer structs.
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| 108 | * @fence: The new exclusive fence for the buffers.
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| 109 | *
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| 110 | * This function should be called when command submission is complete, and
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| 111 | * it will add a new sync object to bos pointed to by entries on @list.
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| 112 | * It also unreserves all buffers, putting them on lru lists.
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| 113 | *
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| 114 |
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| 115 | void ttm_eu_fence_buffer_objects(struct ww_acquire_ctx *ticket,
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| 116 | struct list_head *list,
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| 117 | struct dma_fence *fence);
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| 118 |
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| 119 | #endif
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