blob: 3832fe10b4dffe100ac44c05397819e140822356 [file] [log] [blame]
Thomas Hellstromc078aa22009-12-06 21:46:26 +01001/**************************************************************************
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#include "ttm/ttm_execbuf_util.h"
29#include "ttm/ttm_bo_driver.h"
30#include "ttm/ttm_placement.h"
31#include <linux/wait.h>
32#include <linux/sched.h>
33#include <linux/module.h>
34
Dave Airlied6ea8882010-11-22 13:24:40 +100035static void ttm_eu_backoff_reservation_locked(struct list_head *list)
36{
37 struct ttm_validate_buffer *entry;
38
39 list_for_each_entry(entry, list, head) {
40 struct ttm_buffer_object *bo = entry->bo;
41 if (!entry->reserved)
42 continue;
43
44 if (entry->removed) {
45 ttm_bo_add_to_lru(bo);
46 entry->removed = false;
47
48 }
49 entry->reserved = false;
50 atomic_set(&bo->reserved, 0);
51 wake_up_all(&bo->event_queue);
52 }
53}
54
55static void ttm_eu_del_from_lru_locked(struct list_head *list)
56{
57 struct ttm_validate_buffer *entry;
58
59 list_for_each_entry(entry, list, head) {
60 struct ttm_buffer_object *bo = entry->bo;
61 if (!entry->reserved)
62 continue;
63
64 if (!entry->removed) {
65 entry->put_count = ttm_bo_del_from_lru(bo);
66 entry->removed = true;
67 }
68 }
69}
70
71static void ttm_eu_list_ref_sub(struct list_head *list)
72{
73 struct ttm_validate_buffer *entry;
74
75 list_for_each_entry(entry, list, head) {
76 struct ttm_buffer_object *bo = entry->bo;
77
78 if (entry->put_count) {
79 ttm_bo_list_ref_sub(bo, entry->put_count, true);
80 entry->put_count = 0;
81 }
82 }
83}
84
85static int ttm_eu_wait_unreserved_locked(struct list_head *list,
86 struct ttm_buffer_object *bo)
87{
88 struct ttm_bo_global *glob = bo->glob;
89 int ret;
90
91 ttm_eu_del_from_lru_locked(list);
92 spin_unlock(&glob->lru_lock);
93 ret = ttm_bo_wait_unreserved(bo, true);
94 spin_lock(&glob->lru_lock);
95 if (unlikely(ret != 0))
96 ttm_eu_backoff_reservation_locked(list);
97 return ret;
98}
99
100
Thomas Hellstromc078aa22009-12-06 21:46:26 +0100101void ttm_eu_backoff_reservation(struct list_head *list)
102{
103 struct ttm_validate_buffer *entry;
Thomas Hellstrom68c4fa32010-11-17 12:28:27 +0000104 struct ttm_bo_global *glob;
Thomas Hellstromc078aa22009-12-06 21:46:26 +0100105
Thomas Hellstrom68c4fa32010-11-17 12:28:27 +0000106 if (list_empty(list))
107 return;
Thomas Hellstromc078aa22009-12-06 21:46:26 +0100108
Thomas Hellstrom68c4fa32010-11-17 12:28:27 +0000109 entry = list_first_entry(list, struct ttm_validate_buffer, head);
110 glob = entry->bo->glob;
111 spin_lock(&glob->lru_lock);
112 ttm_eu_backoff_reservation_locked(list);
113 spin_unlock(&glob->lru_lock);
Thomas Hellstromc078aa22009-12-06 21:46:26 +0100114}
115EXPORT_SYMBOL(ttm_eu_backoff_reservation);
116
117/*
118 * Reserve buffers for validation.
119 *
120 * If a buffer in the list is marked for CPU access, we back off and
121 * wait for that buffer to become free for GPU access.
122 *
123 * If a buffer is reserved for another validation, the validator with
124 * the highest validation sequence backs off and waits for that buffer
125 * to become unreserved. This prevents deadlocks when validating multiple
126 * buffers in different orders.
127 */
128
Thomas Hellstrom65705962010-11-17 12:28:31 +0000129int ttm_eu_reserve_buffers(struct list_head *list)
Thomas Hellstromc078aa22009-12-06 21:46:26 +0100130{
Dave Airlied6ea8882010-11-22 13:24:40 +1000131 struct ttm_bo_global *glob;
Thomas Hellstromc078aa22009-12-06 21:46:26 +0100132 struct ttm_validate_buffer *entry;
133 int ret;
Thomas Hellstrom65705962010-11-17 12:28:31 +0000134 uint32_t val_seq;
Thomas Hellstromc078aa22009-12-06 21:46:26 +0100135
Dave Airlied6ea8882010-11-22 13:24:40 +1000136 if (list_empty(list))
137 return 0;
138
139 list_for_each_entry(entry, list, head) {
140 entry->reserved = false;
141 entry->put_count = 0;
142 entry->removed = false;
143 }
144
145 entry = list_first_entry(list, struct ttm_validate_buffer, head);
146 glob = entry->bo->glob;
147
Thomas Hellstromc078aa22009-12-06 21:46:26 +0100148retry:
Dave Airlied6ea8882010-11-22 13:24:40 +1000149 spin_lock(&glob->lru_lock);
Thomas Hellstrom65705962010-11-17 12:28:31 +0000150 val_seq = entry->bo->bdev->val_seq++;
151
Thomas Hellstromc078aa22009-12-06 21:46:26 +0100152 list_for_each_entry(entry, list, head) {
153 struct ttm_buffer_object *bo = entry->bo;
154
Dave Airlied6ea8882010-11-22 13:24:40 +1000155retry_this_bo:
156 ret = ttm_bo_reserve_locked(bo, true, true, true, val_seq);
157 switch (ret) {
158 case 0:
159 break;
160 case -EBUSY:
161 ret = ttm_eu_wait_unreserved_locked(list, bo);
162 if (unlikely(ret != 0)) {
163 spin_unlock(&glob->lru_lock);
164 ttm_eu_list_ref_sub(list);
Thomas Hellstromc078aa22009-12-06 21:46:26 +0100165 return ret;
Dave Airlied6ea8882010-11-22 13:24:40 +1000166 }
167 goto retry_this_bo;
168 case -EAGAIN:
169 ttm_eu_backoff_reservation_locked(list);
170 spin_unlock(&glob->lru_lock);
171 ttm_eu_list_ref_sub(list);
172 ret = ttm_bo_wait_unreserved(bo, true);
173 if (unlikely(ret != 0))
174 return ret;
175 goto retry;
176 default:
177 ttm_eu_backoff_reservation_locked(list);
178 spin_unlock(&glob->lru_lock);
179 ttm_eu_list_ref_sub(list);
180 return ret;
Thomas Hellstromc078aa22009-12-06 21:46:26 +0100181 }
182
183 entry->reserved = true;
184 if (unlikely(atomic_read(&bo->cpu_writers) > 0)) {
Dave Airlied6ea8882010-11-22 13:24:40 +1000185 ttm_eu_backoff_reservation_locked(list);
186 spin_unlock(&glob->lru_lock);
187 ttm_eu_list_ref_sub(list);
Thomas Hellstromc078aa22009-12-06 21:46:26 +0100188 ret = ttm_bo_wait_cpu(bo, false);
189 if (ret)
190 return ret;
191 goto retry;
192 }
193 }
Dave Airlied6ea8882010-11-22 13:24:40 +1000194
195 ttm_eu_del_from_lru_locked(list);
196 spin_unlock(&glob->lru_lock);
197 ttm_eu_list_ref_sub(list);
198
Thomas Hellstromc078aa22009-12-06 21:46:26 +0100199 return 0;
200}
201EXPORT_SYMBOL(ttm_eu_reserve_buffers);
202
203void ttm_eu_fence_buffer_objects(struct list_head *list, void *sync_obj)
204{
205 struct ttm_validate_buffer *entry;
Thomas Hellstrom95762c22010-11-17 12:28:30 +0000206 struct ttm_buffer_object *bo;
207 struct ttm_bo_global *glob;
208 struct ttm_bo_device *bdev;
209 struct ttm_bo_driver *driver;
210
211 if (list_empty(list))
212 return;
213
214 bo = list_first_entry(list, struct ttm_validate_buffer, head)->bo;
215 bdev = bo->bdev;
216 driver = bdev->driver;
217 glob = bo->glob;
218
219 spin_lock(&bdev->fence_lock);
220 spin_lock(&glob->lru_lock);
Thomas Hellstromc078aa22009-12-06 21:46:26 +0100221
222 list_for_each_entry(entry, list, head) {
Thomas Hellstrom95762c22010-11-17 12:28:30 +0000223 bo = entry->bo;
224 entry->old_sync_obj = bo->sync_obj;
Thomas Hellstromc078aa22009-12-06 21:46:26 +0100225 bo->sync_obj = driver->sync_obj_ref(sync_obj);
226 bo->sync_obj_arg = entry->new_sync_obj_arg;
Thomas Hellstrom95762c22010-11-17 12:28:30 +0000227 ttm_bo_unreserve_locked(bo);
Thomas Hellstromc078aa22009-12-06 21:46:26 +0100228 entry->reserved = false;
Thomas Hellstrom95762c22010-11-17 12:28:30 +0000229 }
230 spin_unlock(&glob->lru_lock);
231 spin_unlock(&bdev->fence_lock);
232
233 list_for_each_entry(entry, list, head) {
234 if (entry->old_sync_obj)
235 driver->sync_obj_unref(&entry->old_sync_obj);
Thomas Hellstromc078aa22009-12-06 21:46:26 +0100236 }
237}
238EXPORT_SYMBOL(ttm_eu_fence_buffer_objects);