1 /**************************************************************************
3 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
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
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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:
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
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
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26 * $FreeBSD: head/sys/dev/drm2/ttm/ttm_execbuf_util.c 247835 2013-03-05 09:49:34Z kib $
27 **************************************************************************/
29 #include <dev/drm/drmP.h>
30 #include <dev/drm/ttm/ttm_execbuf_util.h>
31 #include <dev/drm/ttm/ttm_bo_driver.h>
32 #include <dev/drm/ttm/ttm_placement.h>
34 static void ttm_eu_backoff_reservation_locked(struct list_head *list)
36 struct ttm_validate_buffer *entry;
38 list_for_each_entry(entry, list, head) {
39 struct ttm_buffer_object *bo = entry->bo;
44 ttm_bo_add_to_lru(bo);
45 entry->removed = false;
48 entry->reserved = false;
49 atomic_set(&bo->reserved, 0);
54 static void ttm_eu_del_from_lru_locked(struct list_head *list)
56 struct ttm_validate_buffer *entry;
58 list_for_each_entry(entry, list, head) {
59 struct ttm_buffer_object *bo = entry->bo;
63 if (!entry->removed) {
64 entry->put_count = ttm_bo_del_from_lru(bo);
65 entry->removed = true;
70 static void ttm_eu_list_ref_sub(struct list_head *list)
72 struct ttm_validate_buffer *entry;
74 list_for_each_entry(entry, list, head) {
75 struct ttm_buffer_object *bo = entry->bo;
77 if (entry->put_count) {
78 ttm_bo_list_ref_sub(bo, entry->put_count, true);
84 void ttm_eu_backoff_reservation(struct list_head *list)
86 struct ttm_validate_buffer *entry;
87 struct ttm_bo_global *glob;
92 entry = list_first_entry(list, struct ttm_validate_buffer, head);
93 glob = entry->bo->glob;
94 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
95 ttm_eu_backoff_reservation_locked(list);
96 lockmgr(&glob->lru_lock, LK_RELEASE);
100 * Reserve buffers for validation.
102 * If a buffer in the list is marked for CPU access, we back off and
103 * wait for that buffer to become free for GPU access.
105 * If a buffer is reserved for another validation, the validator with
106 * the highest validation sequence backs off and waits for that buffer
107 * to become unreserved. This prevents deadlocks when validating multiple
108 * buffers in different orders.
111 int ttm_eu_reserve_buffers(struct list_head *list)
113 struct ttm_bo_global *glob;
114 struct ttm_validate_buffer *entry;
118 if (list_empty(list))
121 list_for_each_entry(entry, list, head) {
122 entry->reserved = false;
123 entry->put_count = 0;
124 entry->removed = false;
127 entry = list_first_entry(list, struct ttm_validate_buffer, head);
128 glob = entry->bo->glob;
130 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
131 val_seq = entry->bo->bdev->val_seq++;
134 list_for_each_entry(entry, list, head) {
135 struct ttm_buffer_object *bo = entry->bo;
137 /* already slowpath reserved? */
141 ret = ttm_bo_reserve_nolru(bo, true, true, true, val_seq);
146 ttm_eu_del_from_lru_locked(list);
147 ret = ttm_bo_reserve_nolru(bo, true, false,
152 if (unlikely(ret != -EAGAIN))
157 ttm_eu_backoff_reservation_locked(list);
160 * temporarily increase sequence number every retry,
161 * to prevent us from seeing our old reservation
162 * sequence when someone else reserved the buffer,
163 * but hasn't updated the seq_valid/seqno members yet.
165 val_seq = entry->bo->bdev->val_seq++;
167 ttm_eu_list_ref_sub(list);
168 ret = ttm_bo_reserve_slowpath_nolru(bo, true, val_seq);
169 if (unlikely(ret != 0)) {
170 lockmgr(&glob->lru_lock, LK_RELEASE);
173 entry->reserved = true;
174 if (unlikely(atomic_read(&bo->cpu_writers) > 0)) {
183 entry->reserved = true;
184 if (unlikely(atomic_read(&bo->cpu_writers) > 0)) {
190 ttm_eu_del_from_lru_locked(list);
191 lockmgr(&glob->lru_lock, LK_RELEASE);
192 ttm_eu_list_ref_sub(list);
197 ttm_eu_backoff_reservation_locked(list);
198 lockmgr(&glob->lru_lock, LK_RELEASE);
199 ttm_eu_list_ref_sub(list);
203 void ttm_eu_fence_buffer_objects(struct list_head *list, void *sync_obj)
205 struct ttm_validate_buffer *entry;
206 struct ttm_buffer_object *bo;
207 struct ttm_bo_global *glob;
208 struct ttm_bo_device *bdev;
209 struct ttm_bo_driver *driver;
211 if (list_empty(list))
214 bo = list_first_entry(list, struct ttm_validate_buffer, head)->bo;
216 driver = bdev->driver;
219 lockmgr(&glob->lru_lock, LK_EXCLUSIVE);
220 lockmgr(&bdev->fence_lock, LK_EXCLUSIVE);
222 list_for_each_entry(entry, list, head) {
224 entry->old_sync_obj = bo->sync_obj;
225 bo->sync_obj = driver->sync_obj_ref(sync_obj);
226 ttm_bo_unreserve_locked(bo);
227 entry->reserved = false;
229 lockmgr(&bdev->fence_lock, LK_RELEASE);
230 lockmgr(&glob->lru_lock, LK_RELEASE);
232 list_for_each_entry(entry, list, head) {
233 if (entry->old_sync_obj)
234 driver->sync_obj_unref(&entry->old_sync_obj);