Thomas Hellstrom | c078aa2 | 2009-12-06 21:46:26 +0100 | [diff] [blame] | 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 | #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 Airlie | d6ea888 | 2010-11-22 13:24:40 +1000 | [diff] [blame] | 35 | static 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 | |
| 55 | static 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 | |
| 71 | static 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 | |
| 85 | static 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 Hellstrom | c078aa2 | 2009-12-06 21:46:26 +0100 | [diff] [blame] | 101 | void ttm_eu_backoff_reservation(struct list_head *list) |
| 102 | { |
| 103 | struct ttm_validate_buffer *entry; |
Thomas Hellstrom | 68c4fa3 | 2010-11-17 12:28:27 +0000 | [diff] [blame] | 104 | struct ttm_bo_global *glob; |
Thomas Hellstrom | c078aa2 | 2009-12-06 21:46:26 +0100 | [diff] [blame] | 105 | |
Thomas Hellstrom | 68c4fa3 | 2010-11-17 12:28:27 +0000 | [diff] [blame] | 106 | if (list_empty(list)) |
| 107 | return; |
Thomas Hellstrom | c078aa2 | 2009-12-06 21:46:26 +0100 | [diff] [blame] | 108 | |
Thomas Hellstrom | 68c4fa3 | 2010-11-17 12:28:27 +0000 | [diff] [blame] | 109 | 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 Hellstrom | c078aa2 | 2009-12-06 21:46:26 +0100 | [diff] [blame] | 114 | } |
| 115 | EXPORT_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 | |
| 129 | int ttm_eu_reserve_buffers(struct list_head *list, uint32_t val_seq) |
| 130 | { |
Dave Airlie | d6ea888 | 2010-11-22 13:24:40 +1000 | [diff] [blame] | 131 | struct ttm_bo_global *glob; |
Thomas Hellstrom | c078aa2 | 2009-12-06 21:46:26 +0100 | [diff] [blame] | 132 | struct ttm_validate_buffer *entry; |
| 133 | int ret; |
| 134 | |
Dave Airlie | d6ea888 | 2010-11-22 13:24:40 +1000 | [diff] [blame] | 135 | if (list_empty(list)) |
| 136 | return 0; |
| 137 | |
| 138 | list_for_each_entry(entry, list, head) { |
| 139 | entry->reserved = false; |
| 140 | entry->put_count = 0; |
| 141 | entry->removed = false; |
| 142 | } |
| 143 | |
| 144 | entry = list_first_entry(list, struct ttm_validate_buffer, head); |
| 145 | glob = entry->bo->glob; |
| 146 | |
Thomas Hellstrom | c078aa2 | 2009-12-06 21:46:26 +0100 | [diff] [blame] | 147 | retry: |
Dave Airlie | d6ea888 | 2010-11-22 13:24:40 +1000 | [diff] [blame] | 148 | spin_lock(&glob->lru_lock); |
Thomas Hellstrom | c078aa2 | 2009-12-06 21:46:26 +0100 | [diff] [blame] | 149 | list_for_each_entry(entry, list, head) { |
| 150 | struct ttm_buffer_object *bo = entry->bo; |
| 151 | |
Dave Airlie | d6ea888 | 2010-11-22 13:24:40 +1000 | [diff] [blame] | 152 | retry_this_bo: |
| 153 | ret = ttm_bo_reserve_locked(bo, true, true, true, val_seq); |
| 154 | switch (ret) { |
| 155 | case 0: |
| 156 | break; |
| 157 | case -EBUSY: |
| 158 | ret = ttm_eu_wait_unreserved_locked(list, bo); |
| 159 | if (unlikely(ret != 0)) { |
| 160 | spin_unlock(&glob->lru_lock); |
| 161 | ttm_eu_list_ref_sub(list); |
Thomas Hellstrom | c078aa2 | 2009-12-06 21:46:26 +0100 | [diff] [blame] | 162 | return ret; |
Dave Airlie | d6ea888 | 2010-11-22 13:24:40 +1000 | [diff] [blame] | 163 | } |
| 164 | goto retry_this_bo; |
| 165 | case -EAGAIN: |
| 166 | ttm_eu_backoff_reservation_locked(list); |
| 167 | spin_unlock(&glob->lru_lock); |
| 168 | ttm_eu_list_ref_sub(list); |
| 169 | ret = ttm_bo_wait_unreserved(bo, true); |
| 170 | if (unlikely(ret != 0)) |
| 171 | return ret; |
| 172 | goto retry; |
| 173 | default: |
| 174 | ttm_eu_backoff_reservation_locked(list); |
| 175 | spin_unlock(&glob->lru_lock); |
| 176 | ttm_eu_list_ref_sub(list); |
| 177 | return ret; |
Thomas Hellstrom | c078aa2 | 2009-12-06 21:46:26 +0100 | [diff] [blame] | 178 | } |
| 179 | |
| 180 | entry->reserved = true; |
| 181 | if (unlikely(atomic_read(&bo->cpu_writers) > 0)) { |
Dave Airlie | d6ea888 | 2010-11-22 13:24:40 +1000 | [diff] [blame] | 182 | ttm_eu_backoff_reservation_locked(list); |
| 183 | spin_unlock(&glob->lru_lock); |
| 184 | ttm_eu_list_ref_sub(list); |
Thomas Hellstrom | c078aa2 | 2009-12-06 21:46:26 +0100 | [diff] [blame] | 185 | ret = ttm_bo_wait_cpu(bo, false); |
| 186 | if (ret) |
| 187 | return ret; |
| 188 | goto retry; |
| 189 | } |
| 190 | } |
Dave Airlie | d6ea888 | 2010-11-22 13:24:40 +1000 | [diff] [blame] | 191 | |
| 192 | ttm_eu_del_from_lru_locked(list); |
| 193 | spin_unlock(&glob->lru_lock); |
| 194 | ttm_eu_list_ref_sub(list); |
| 195 | |
Thomas Hellstrom | c078aa2 | 2009-12-06 21:46:26 +0100 | [diff] [blame] | 196 | return 0; |
| 197 | } |
| 198 | EXPORT_SYMBOL(ttm_eu_reserve_buffers); |
| 199 | |
| 200 | void ttm_eu_fence_buffer_objects(struct list_head *list, void *sync_obj) |
| 201 | { |
| 202 | struct ttm_validate_buffer *entry; |
| 203 | |
| 204 | list_for_each_entry(entry, list, head) { |
| 205 | struct ttm_buffer_object *bo = entry->bo; |
Thomas Hellstrom | 702adba | 2010-11-17 12:28:29 +0000 | [diff] [blame^] | 206 | struct ttm_bo_device *bdev = bo->bdev; |
| 207 | struct ttm_bo_driver *driver = bdev->driver; |
Thomas Hellstrom | c078aa2 | 2009-12-06 21:46:26 +0100 | [diff] [blame] | 208 | void *old_sync_obj; |
| 209 | |
Thomas Hellstrom | 702adba | 2010-11-17 12:28:29 +0000 | [diff] [blame^] | 210 | spin_lock(&bdev->fence_lock); |
Thomas Hellstrom | c078aa2 | 2009-12-06 21:46:26 +0100 | [diff] [blame] | 211 | old_sync_obj = bo->sync_obj; |
| 212 | bo->sync_obj = driver->sync_obj_ref(sync_obj); |
| 213 | bo->sync_obj_arg = entry->new_sync_obj_arg; |
Thomas Hellstrom | 702adba | 2010-11-17 12:28:29 +0000 | [diff] [blame^] | 214 | spin_unlock(&bdev->fence_lock); |
Thomas Hellstrom | c078aa2 | 2009-12-06 21:46:26 +0100 | [diff] [blame] | 215 | ttm_bo_unreserve(bo); |
| 216 | entry->reserved = false; |
| 217 | if (old_sync_obj) |
| 218 | driver->sync_obj_unref(&old_sync_obj); |
| 219 | } |
| 220 | } |
| 221 | EXPORT_SYMBOL(ttm_eu_fence_buffer_objects); |