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 *
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19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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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 <linux/list.h>
35
36struct ww_acquire_ctx;
37struct dma_fence;
38struct ttm_buffer_object;
39
40/**
41 * struct ttm_validate_buffer
42 *
43 * @head: list head for thread-private list.
44 * @bo: refcounted buffer object pointer.
45 * @num_shared: How many shared fences we want to add.
46 */
47
48struct ttm_validate_buffer {
49 struct list_head head;
50 struct ttm_buffer_object *bo;
51 unsigned int num_shared;
52};
53
54/**
55 * function ttm_eu_backoff_reservation
56 *
57 * @ticket: ww_acquire_ctx from reserve call
58 * @list: thread private list of ttm_validate_buffer structs.
59 *
60 * Undoes all buffer validation reservations for bos pointed to by
61 * the list entries.
62 */
63void ttm_eu_backoff_reservation(struct ww_acquire_ctx *ticket,
64 struct list_head *list);
65
66/**
67 * function ttm_eu_reserve_buffers
68 *
69 * @ticket: [out] ww_acquire_ctx filled in by call, or NULL if only
70 * non-blocking reserves should be tried.
71 * @list: thread private list of ttm_validate_buffer structs.
72 * @intr: should the wait be interruptible
73 * @dups: [out] optional list of duplicates.
74 * @del_lru: true if BOs should be removed from the LRU.
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 * If intr is set to true, this function may return -ERESTARTSYS if the
87 * calling process receives a signal while waiting. In that case, no
88 * buffers on the list will be reserved upon return.
89 *
90 * If dups is non NULL all buffers already reserved by the current thread
91 * (e.g. duplicates) are added to this list, otherwise -EALREADY is returned
92 * on the first already reserved buffer and all buffers from the list are
93 * unreserved again.
94 *
95 * Buffers reserved by this function should be unreserved by
96 * a call to either ttm_eu_backoff_reservation() or
97 * ttm_eu_fence_buffer_objects() when command submission is complete or
98 * has failed.
99 */
100int ttm_eu_reserve_buffers(struct ww_acquire_ctx *ticket,
101 struct list_head *list, bool intr,
102 struct list_head *dups);
103
104/**
105 * function ttm_eu_fence_buffer_objects.
106 *
107 * @ticket: ww_acquire_ctx from reserve call
108 * @list: thread private list of ttm_validate_buffer structs.
109 * @fence: The new exclusive fence for the buffers.
110 *
111 * This function should be called when command submission is complete, and
112 * it will add a new sync object to bos pointed to by entries on @list.
113 * It also unreserves all buffers, putting them on lru lists.
114 *
115 */
116void ttm_eu_fence_buffer_objects(struct ww_acquire_ctx *ticket,
117 struct list_head *list,
118 struct dma_fence *fence);
119
120#endif
121

source code of linux/include/drm/ttm/ttm_execbuf_util.h