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authorThomas Hellstrom <thellstrom@vmware.com>2009-12-06 15:46:26 -0500
committerDave Airlie <airlied@redhat.com>2009-12-07 00:22:05 -0500
commitc078aa2fc4d8e022c3b611e07b25ff77afdf9b73 (patch)
tree60349ecc7344001b3824529be376b4677012583d /include/drm/ttm
parent4aff1013f5e4ae08a24155c029a2c5e1a7929de6 (diff)
drm/ttm: Add TTM execbuf utilities.
Utilities to reserve, unreserve and fence a list of TTM buffer objects in a deadlock-safe manner. Used by the vmwgfx driver. Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'include/drm/ttm')
-rw-r--r--include/drm/ttm/ttm_execbuf_util.h107
1 files changed, 107 insertions, 0 deletions
diff --git a/include/drm/ttm/ttm_execbuf_util.h b/include/drm/ttm/ttm_execbuf_util.h
new file mode 100644
index 000000000000..cd2c475da9ea
--- /dev/null
+++ b/include/drm/ttm/ttm_execbuf_util.h
@@ -0,0 +1,107 @@
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 "ttm/ttm_bo_api.h"
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.
44 * @reservied: Indicates whether @bo has been reserved for validation.
45 */
46
47struct ttm_validate_buffer {
48 struct list_head head;
49 struct ttm_buffer_object *bo;
50 void *new_sync_obj_arg;
51 bool reserved;
52};
53
54/**
55 * function ttm_eu_backoff_reservation
56 *
57 * @list: thread private list of ttm_validate_buffer structs.
58 *
59 * Undoes all buffer validation reservations for bos pointed to by
60 * the list entries.
61 */
62
63extern void ttm_eu_backoff_reservation(struct list_head *list);
64
65/**
66 * function ttm_eu_reserve_buffers
67 *
68 * @list: thread private list of ttm_validate_buffer structs.
69 * @val_seq: A unique sequence number.
70 *
71 * Tries to reserve bos pointed to by the list entries for validation.
72 * If the function returns 0, all buffers are marked as "unfenced",
73 * taken off the lru lists and are not synced for write CPU usage.
74 *
75 * If the function detects a deadlock due to multiple threads trying to
76 * reserve the same buffers in reverse order, all threads except one will
77 * back off and retry. This function may sleep while waiting for
78 * CPU write reservations to be cleared, and for other threads to
79 * unreserve their buffers.
80 *
81 * This function may return -ERESTART or -EAGAIN if the calling process
82 * receives a signal while waiting. In that case, no buffers on the list
83 * will be reserved upon return.
84 *
85 * Buffers reserved by this function should be unreserved by
86 * a call to either ttm_eu_backoff_reservation() or
87 * ttm_eu_fence_buffer_objects() when command submission is complete or
88 * has failed.
89 */
90
91extern int ttm_eu_reserve_buffers(struct list_head *list, uint32_t val_seq);
92
93/**
94 * function ttm_eu_fence_buffer_objects.
95 *
96 * @list: thread private list of ttm_validate_buffer structs.
97 * @sync_obj: The new sync object for the buffers.
98 *
99 * This function should be called when command submission is complete, and
100 * it will add a new sync object to bos pointed to by entries on @list.
101 * It also unreserves all buffers, putting them on lru lists.
102 *
103 */
104
105extern void ttm_eu_fence_buffer_objects(struct list_head *list, void *sync_obj);
106
107#endif