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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. | |
d6ea8886 DA |
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. | |
95762c2b | 47 | * @old_sync_obj: Pointer to a sync object about to be unreferenced |
c078aa2f TH |
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; | |
d6ea8886 DA |
55 | bool removed; |
56 | int put_count; | |
95762c2b | 57 | void *old_sync_obj; |
c078aa2f TH |
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. | |
75 | * @val_seq: A unique sequence number. | |
76 | * | |
77 | * Tries to reserve bos pointed to by the list entries for validation. | |
78 | * If the function returns 0, all buffers are marked as "unfenced", | |
79 | * taken off the lru lists and are not synced for write CPU usage. | |
80 | * | |
81 | * If the function detects a deadlock due to multiple threads trying to | |
82 | * reserve the same buffers in reverse order, all threads except one will | |
83 | * back off and retry. This function may sleep while waiting for | |
84 | * CPU write reservations to be cleared, and for other threads to | |
85 | * unreserve their buffers. | |
86 | * | |
87 | * This function may return -ERESTART or -EAGAIN if the calling process | |
88 | * receives a signal while waiting. In that case, no buffers on the list | |
89 | * will be reserved upon return. | |
90 | * | |
91 | * Buffers reserved by this function should be unreserved by | |
92 | * a call to either ttm_eu_backoff_reservation() or | |
93 | * ttm_eu_fence_buffer_objects() when command submission is complete or | |
94 | * has failed. | |
95 | */ | |
96 | ||
97 | extern int ttm_eu_reserve_buffers(struct list_head *list, uint32_t val_seq); | |
98 | ||
99 | /** | |
100 | * function ttm_eu_fence_buffer_objects. | |
101 | * | |
102 | * @list: thread private list of ttm_validate_buffer structs. | |
103 | * @sync_obj: The new sync object for the buffers. | |
104 | * | |
105 | * This function should be called when command submission is complete, and | |
106 | * it will add a new sync object to bos pointed to by entries on @list. | |
107 | * It also unreserves all buffers, putting them on lru lists. | |
108 | * | |
109 | */ | |
110 | ||
111 | extern void ttm_eu_fence_buffer_objects(struct list_head *list, void *sync_obj); | |
112 | ||
113 | #endif |