blob: 7392da557be2e10f09470523f85a62e0cc84924e [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
David Howells760285e2012-10-02 18:01:07 +010028#include <drm/ttm/ttm_execbuf_util.h>
29#include <drm/ttm/ttm_bo_driver.h>
30#include <drm/ttm/ttm_placement.h>
Thomas Hellstromc078aa22009-12-06 21:46:26 +010031#include <linux/wait.h>
32#include <linux/sched.h>
33#include <linux/module.h>
34
Maarten Lankhorstecff6652013-06-27 13:48:17 +020035static void ttm_eu_backoff_reservation_locked(struct list_head *list,
36 struct ww_acquire_ctx *ticket)
Dave Airlied6ea8882010-11-22 13:24:40 +100037{
38 struct ttm_validate_buffer *entry;
39
40 list_for_each_entry(entry, list, head) {
41 struct ttm_buffer_object *bo = entry->bo;
42 if (!entry->reserved)
43 continue;
44
Maarten Lankhorstecff6652013-06-27 13:48:17 +020045 entry->reserved = false;
Dave Airlied6ea8882010-11-22 13:24:40 +100046 if (entry->removed) {
Maarten Lankhorstecff6652013-06-27 13:48:17 +020047 ttm_bo_unreserve_ticket_locked(bo, ticket);
Dave Airlied6ea8882010-11-22 13:24:40 +100048 entry->removed = false;
49
Maarten Lankhorstecff6652013-06-27 13:48:17 +020050 } else {
Maarten Lankhorst5e338402013-06-27 13:48:19 +020051 ww_mutex_unlock(&bo->resv->lock);
Dave Airlied6ea8882010-11-22 13:24:40 +100052 }
Dave Airlied6ea8882010-11-22 13:24:40 +100053 }
54}
55
56static void ttm_eu_del_from_lru_locked(struct list_head *list)
57{
58 struct ttm_validate_buffer *entry;
59
60 list_for_each_entry(entry, list, head) {
61 struct ttm_buffer_object *bo = entry->bo;
62 if (!entry->reserved)
63 continue;
64
65 if (!entry->removed) {
66 entry->put_count = ttm_bo_del_from_lru(bo);
67 entry->removed = true;
68 }
69 }
70}
71
72static void ttm_eu_list_ref_sub(struct list_head *list)
73{
74 struct ttm_validate_buffer *entry;
75
76 list_for_each_entry(entry, list, head) {
77 struct ttm_buffer_object *bo = entry->bo;
78
79 if (entry->put_count) {
80 ttm_bo_list_ref_sub(bo, entry->put_count, true);
81 entry->put_count = 0;
82 }
83 }
84}
85
Maarten Lankhorstecff6652013-06-27 13:48:17 +020086void ttm_eu_backoff_reservation(struct ww_acquire_ctx *ticket,
87 struct list_head *list)
Thomas Hellstromc078aa22009-12-06 21:46:26 +010088{
89 struct ttm_validate_buffer *entry;
Thomas Hellstrom68c4fa32010-11-17 12:28:27 +000090 struct ttm_bo_global *glob;
Thomas Hellstromc078aa22009-12-06 21:46:26 +010091
Thomas Hellstrom68c4fa32010-11-17 12:28:27 +000092 if (list_empty(list))
93 return;
Thomas Hellstromc078aa22009-12-06 21:46:26 +010094
Thomas Hellstrom68c4fa32010-11-17 12:28:27 +000095 entry = list_first_entry(list, struct ttm_validate_buffer, head);
96 glob = entry->bo->glob;
97 spin_lock(&glob->lru_lock);
Maarten Lankhorstecff6652013-06-27 13:48:17 +020098 ttm_eu_backoff_reservation_locked(list, ticket);
99 ww_acquire_fini(ticket);
Thomas Hellstrom68c4fa32010-11-17 12:28:27 +0000100 spin_unlock(&glob->lru_lock);
Thomas Hellstromc078aa22009-12-06 21:46:26 +0100101}
102EXPORT_SYMBOL(ttm_eu_backoff_reservation);
103
104/*
105 * Reserve buffers for validation.
106 *
107 * If a buffer in the list is marked for CPU access, we back off and
108 * wait for that buffer to become free for GPU access.
109 *
110 * If a buffer is reserved for another validation, the validator with
111 * the highest validation sequence backs off and waits for that buffer
112 * to become unreserved. This prevents deadlocks when validating multiple
113 * buffers in different orders.
114 */
115
Maarten Lankhorstecff6652013-06-27 13:48:17 +0200116int ttm_eu_reserve_buffers(struct ww_acquire_ctx *ticket,
117 struct list_head *list)
Thomas Hellstromc078aa22009-12-06 21:46:26 +0100118{
Dave Airlied6ea8882010-11-22 13:24:40 +1000119 struct ttm_bo_global *glob;
Thomas Hellstromc078aa22009-12-06 21:46:26 +0100120 struct ttm_validate_buffer *entry;
121 int ret;
122
Dave Airlied6ea8882010-11-22 13:24:40 +1000123 if (list_empty(list))
124 return 0;
125
126 list_for_each_entry(entry, list, head) {
127 entry->reserved = false;
128 entry->put_count = 0;
129 entry->removed = false;
130 }
131
132 entry = list_first_entry(list, struct ttm_validate_buffer, head);
133 glob = entry->bo->glob;
134
Maarten Lankhorstecff6652013-06-27 13:48:17 +0200135 ww_acquire_init(ticket, &reservation_ww_class);
Maarten Lankhorstf2d476a2013-01-15 14:57:10 +0100136retry:
Thomas Hellstromc078aa22009-12-06 21:46:26 +0100137 list_for_each_entry(entry, list, head) {
138 struct ttm_buffer_object *bo = entry->bo;
139
Maarten Lankhorstf2d476a2013-01-15 14:57:10 +0100140 /* already slowpath reserved? */
141 if (entry->reserved)
142 continue;
143
Maarten Lankhorst5e338402013-06-27 13:48:19 +0200144
145 ret = ttm_bo_reserve_nolru(bo, true, false, true, ticket);
146
147 if (ret == -EDEADLK) {
148 /* uh oh, we lost out, drop every reservation and try
149 * to only reserve this buffer, then start over if
150 * this succeeds.
151 */
Maarten Lankhorst7a186302013-01-15 14:56:48 +0100152 spin_lock(&glob->lru_lock);
Maarten Lankhorstecff6652013-06-27 13:48:17 +0200153 ttm_eu_backoff_reservation_locked(list, ticket);
Dave Airlied6ea8882010-11-22 13:24:40 +1000154 spin_unlock(&glob->lru_lock);
155 ttm_eu_list_ref_sub(list);
Maarten Lankhorst5e338402013-06-27 13:48:19 +0200156 ret = ww_mutex_lock_slow_interruptible(&bo->resv->lock,
157 ticket);
158 if (unlikely(ret != 0)) {
159 if (ret == -EINTR)
160 ret = -ERESTARTSYS;
Maarten Lankhorstecff6652013-06-27 13:48:17 +0200161 goto err_fini;
Maarten Lankhorst5e338402013-06-27 13:48:19 +0200162 }
Maarten Lankhorstecff6652013-06-27 13:48:17 +0200163
Maarten Lankhorstf2d476a2013-01-15 14:57:10 +0100164 entry->reserved = true;
165 if (unlikely(atomic_read(&bo->cpu_writers) > 0)) {
166 ret = -EBUSY;
167 goto err;
168 }
Dave Airlied6ea8882010-11-22 13:24:40 +1000169 goto retry;
Maarten Lankhorst5e338402013-06-27 13:48:19 +0200170 } else if (ret)
Maarten Lankhorst7a186302013-01-15 14:56:48 +0100171 goto err;
Thomas Hellstromc078aa22009-12-06 21:46:26 +0100172
173 entry->reserved = true;
174 if (unlikely(atomic_read(&bo->cpu_writers) > 0)) {
Maarten Lankhorst7a186302013-01-15 14:56:48 +0100175 ret = -EBUSY;
176 goto err;
Thomas Hellstromc078aa22009-12-06 21:46:26 +0100177 }
178 }
Dave Airlied6ea8882010-11-22 13:24:40 +1000179
Maarten Lankhorstecff6652013-06-27 13:48:17 +0200180 ww_acquire_done(ticket);
Maarten Lankhorst5e338402013-06-27 13:48:19 +0200181 spin_lock(&glob->lru_lock);
Dave Airlied6ea8882010-11-22 13:24:40 +1000182 ttm_eu_del_from_lru_locked(list);
183 spin_unlock(&glob->lru_lock);
184 ttm_eu_list_ref_sub(list);
Thomas Hellstromc078aa22009-12-06 21:46:26 +0100185 return 0;
Maarten Lankhorst7a186302013-01-15 14:56:48 +0100186
187err:
Maarten Lankhorst5e338402013-06-27 13:48:19 +0200188 spin_lock(&glob->lru_lock);
Maarten Lankhorstecff6652013-06-27 13:48:17 +0200189 ttm_eu_backoff_reservation_locked(list, ticket);
Maarten Lankhorst7a186302013-01-15 14:56:48 +0100190 spin_unlock(&glob->lru_lock);
191 ttm_eu_list_ref_sub(list);
Maarten Lankhorstecff6652013-06-27 13:48:17 +0200192err_fini:
193 ww_acquire_done(ticket);
194 ww_acquire_fini(ticket);
Maarten Lankhorst7a186302013-01-15 14:56:48 +0100195 return ret;
Thomas Hellstromc078aa22009-12-06 21:46:26 +0100196}
197EXPORT_SYMBOL(ttm_eu_reserve_buffers);
198
Maarten Lankhorstecff6652013-06-27 13:48:17 +0200199void ttm_eu_fence_buffer_objects(struct ww_acquire_ctx *ticket,
200 struct list_head *list, void *sync_obj)
Thomas Hellstromc078aa22009-12-06 21:46:26 +0100201{
202 struct ttm_validate_buffer *entry;
Thomas Hellstrom95762c22010-11-17 12:28:30 +0000203 struct ttm_buffer_object *bo;
204 struct ttm_bo_global *glob;
205 struct ttm_bo_device *bdev;
206 struct ttm_bo_driver *driver;
207
208 if (list_empty(list))
209 return;
210
211 bo = list_first_entry(list, struct ttm_validate_buffer, head)->bo;
212 bdev = bo->bdev;
213 driver = bdev->driver;
214 glob = bo->glob;
215
Thomas Hellstrom95762c22010-11-17 12:28:30 +0000216 spin_lock(&glob->lru_lock);
Maarten Lankhorst4154f052012-11-28 12:25:39 +0100217 spin_lock(&bdev->fence_lock);
Thomas Hellstromc078aa22009-12-06 21:46:26 +0100218
219 list_for_each_entry(entry, list, head) {
Thomas Hellstrom95762c22010-11-17 12:28:30 +0000220 bo = entry->bo;
221 entry->old_sync_obj = bo->sync_obj;
Thomas Hellstromc078aa22009-12-06 21:46:26 +0100222 bo->sync_obj = driver->sync_obj_ref(sync_obj);
Maarten Lankhorstecff6652013-06-27 13:48:17 +0200223 ttm_bo_unreserve_ticket_locked(bo, ticket);
Thomas Hellstromc078aa22009-12-06 21:46:26 +0100224 entry->reserved = false;
Thomas Hellstrom95762c22010-11-17 12:28:30 +0000225 }
Thomas Hellstrom95762c22010-11-17 12:28:30 +0000226 spin_unlock(&bdev->fence_lock);
Maarten Lankhorst4154f052012-11-28 12:25:39 +0100227 spin_unlock(&glob->lru_lock);
Maarten Lankhorstecff6652013-06-27 13:48:17 +0200228 ww_acquire_fini(ticket);
Thomas Hellstrom95762c22010-11-17 12:28:30 +0000229
230 list_for_each_entry(entry, list, head) {
231 if (entry->old_sync_obj)
232 driver->sync_obj_unref(&entry->old_sync_obj);
Thomas Hellstromc078aa22009-12-06 21:46:26 +0100233 }
234}
235EXPORT_SYMBOL(ttm_eu_fence_buffer_objects);