| 1 | /* |
| 2 | * Copyright 2014 Advanced Micro Devices, Inc. |
| 3 | * All Rights Reserved. |
| 4 | * |
| 5 | * Permission is hereby granted, free of charge, to any person obtaining a |
| 6 | * copy of this software and associated documentation files (the |
| 7 | * "Software"), to deal in the Software without restriction, including |
| 8 | * without limitation the rights to use, copy, modify, merge, publish, |
| 9 | * distribute, sub license, and/or sell copies of the Software, and to |
| 10 | * permit persons to whom the Software is furnished to do so, subject to |
| 11 | * the following conditions: |
| 12 | * |
| 13 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 14 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 15 | * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL |
| 16 | * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, |
| 17 | * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR |
| 18 | * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE |
| 19 | * USE OR OTHER DEALINGS IN THE SOFTWARE. |
| 20 | * |
| 21 | * The above copyright notice and this permission notice (including the |
| 22 | * next paragraph) shall be included in all copies or substantial portions |
| 23 | * of the Software. |
| 24 | * |
| 25 | */ |
| 26 | /* |
| 27 | * Authors: |
| 28 | * Christian König <christian.koenig@amd.com> |
| 29 | */ |
| 30 | |
| 31 | #include <linux/firmware.h> |
| 32 | #include <linux/module.h> |
| 33 | #include <linux/mmu_notifier.h> |
| 34 | |
| 35 | #include <drm/drm.h> |
| 36 | |
| 37 | #include "radeon.h" |
| 38 | |
| 39 | struct radeon_mn { |
| 40 | /* constant after initialisation */ |
| 41 | struct radeon_device *rdev; |
| 42 | struct mm_struct *mm; |
| 43 | struct mmu_notifier mn; |
| 44 | |
| 45 | /* only used on destruction */ |
| 46 | struct work_struct work; |
| 47 | |
| 48 | /* protected by rdev->mn_lock */ |
| 49 | struct hlist_node node; |
| 50 | |
| 51 | /* objects protected by lock */ |
| 52 | struct mutex lock; |
| 53 | struct rb_root_cached objects; |
| 54 | }; |
| 55 | |
| 56 | struct radeon_mn_node { |
| 57 | struct interval_tree_node it; |
| 58 | struct list_head bos; |
| 59 | }; |
| 60 | |
| 61 | /** |
| 62 | * radeon_mn_destroy - destroy the rmn |
| 63 | * |
| 64 | * @work: previously sheduled work item |
| 65 | * |
| 66 | * Lazy destroys the notifier from a work item |
| 67 | */ |
| 68 | static void radeon_mn_destroy(struct work_struct *work) |
| 69 | { |
| 70 | struct radeon_mn *rmn = container_of(work, struct radeon_mn, work); |
| 71 | struct radeon_device *rdev = rmn->rdev; |
| 72 | struct radeon_mn_node *node, *next_node; |
| 73 | struct radeon_bo *bo, *next_bo; |
| 74 | |
| 75 | mutex_lock(&rdev->mn_lock); |
| 76 | mutex_lock(&rmn->lock); |
| 77 | hash_del(&rmn->node); |
| 78 | rbtree_postorder_for_each_entry_safe(node, next_node, |
| 79 | &rmn->objects.rb_root, it.rb) { |
| 80 | |
| 81 | interval_tree_remove(&node->it, &rmn->objects); |
| 82 | list_for_each_entry_safe(bo, next_bo, &node->bos, mn_list) { |
| 83 | bo->mn = NULL; |
| 84 | list_del_init(&bo->mn_list); |
| 85 | } |
| 86 | kfree(node); |
| 87 | } |
| 88 | mutex_unlock(&rmn->lock); |
| 89 | mutex_unlock(&rdev->mn_lock); |
| 90 | mmu_notifier_unregister(&rmn->mn, rmn->mm); |
| 91 | kfree(rmn); |
| 92 | } |
| 93 | |
| 94 | /** |
| 95 | * radeon_mn_release - callback to notify about mm destruction |
| 96 | * |
| 97 | * @mn: our notifier |
| 98 | * @mn: the mm this callback is about |
| 99 | * |
| 100 | * Shedule a work item to lazy destroy our notifier. |
| 101 | */ |
| 102 | static void radeon_mn_release(struct mmu_notifier *mn, |
| 103 | struct mm_struct *mm) |
| 104 | { |
| 105 | struct radeon_mn *rmn = container_of(mn, struct radeon_mn, mn); |
| 106 | INIT_WORK(&rmn->work, radeon_mn_destroy); |
| 107 | schedule_work(&rmn->work); |
| 108 | } |
| 109 | |
| 110 | /** |
| 111 | * radeon_mn_invalidate_range_start - callback to notify about mm change |
| 112 | * |
| 113 | * @mn: our notifier |
| 114 | * @mn: the mm this callback is about |
| 115 | * @start: start of updated range |
| 116 | * @end: end of updated range |
| 117 | * |
| 118 | * We block for all BOs between start and end to be idle and |
| 119 | * unmap them by move them into system domain again. |
| 120 | */ |
| 121 | static int radeon_mn_invalidate_range_start(struct mmu_notifier *mn, |
| 122 | const struct mmu_notifier_range *range) |
| 123 | { |
| 124 | struct radeon_mn *rmn = container_of(mn, struct radeon_mn, mn); |
| 125 | struct ttm_operation_ctx ctx = { false, false }; |
| 126 | struct interval_tree_node *it; |
| 127 | unsigned long end; |
| 128 | int ret = 0; |
| 129 | |
| 130 | /* notification is exclusive, but interval is inclusive */ |
| 131 | end = range->end - 1; |
| 132 | |
| 133 | /* TODO we should be able to split locking for interval tree and |
| 134 | * the tear down. |
| 135 | */ |
| 136 | if (mmu_notifier_range_blockable(range)) |
| 137 | mutex_lock(&rmn->lock); |
| 138 | else if (!mutex_trylock(&rmn->lock)) |
| 139 | return -EAGAIN; |
| 140 | |
| 141 | it = interval_tree_iter_first(&rmn->objects, range->start, end); |
| 142 | while (it) { |
| 143 | struct radeon_mn_node *node; |
| 144 | struct radeon_bo *bo; |
| 145 | long r; |
| 146 | |
| 147 | if (!mmu_notifier_range_blockable(range)) { |
| 148 | ret = -EAGAIN; |
| 149 | goto out_unlock; |
| 150 | } |
| 151 | |
| 152 | node = container_of(it, struct radeon_mn_node, it); |
| 153 | it = interval_tree_iter_next(it, range->start, end); |
| 154 | |
| 155 | list_for_each_entry(bo, &node->bos, mn_list) { |
| 156 | |
| 157 | if (!bo->tbo.ttm || bo->tbo.ttm->state != tt_bound) |
| 158 | continue; |
| 159 | |
| 160 | r = radeon_bo_reserve(bo, true); |
| 161 | if (r) { |
| 162 | DRM_ERROR("(%ld) failed to reserve user bo\n", r); |
| 163 | continue; |
| 164 | } |
| 165 | |
| 166 | r = dma_resv_wait_timeout_rcu(bo->tbo.base.resv, |
| 167 | true, false, MAX_SCHEDULE_TIMEOUT); |
| 168 | if (r <= 0) |
| 169 | DRM_ERROR("(%ld) failed to wait for user bo\n", r); |
| 170 | |
| 171 | radeon_ttm_placement_from_domain(bo, RADEON_GEM_DOMAIN_CPU); |
| 172 | r = ttm_bo_validate(&bo->tbo, &bo->placement, &ctx); |
| 173 | if (r) |
| 174 | DRM_ERROR("(%ld) failed to validate user bo\n", r); |
| 175 | |
| 176 | radeon_bo_unreserve(bo); |
| 177 | } |
| 178 | } |
| 179 | |
| 180 | out_unlock: |
| 181 | mutex_unlock(&rmn->lock); |
| 182 | |
| 183 | return ret; |
| 184 | } |
| 185 | |
| 186 | static const struct mmu_notifier_ops radeon_mn_ops = { |
| 187 | .release = radeon_mn_release, |
| 188 | .invalidate_range_start = radeon_mn_invalidate_range_start, |
| 189 | }; |
| 190 | |
| 191 | /** |
| 192 | * radeon_mn_get - create notifier context |
| 193 | * |
| 194 | * @rdev: radeon device pointer |
| 195 | * |
| 196 | * Creates a notifier context for current->mm. |
| 197 | */ |
| 198 | static struct radeon_mn *radeon_mn_get(struct radeon_device *rdev) |
| 199 | { |
| 200 | struct mm_struct *mm = current->mm; |
| 201 | struct radeon_mn *rmn; |
| 202 | int r; |
| 203 | |
| 204 | if (down_write_killable(&mm->mmap_sem)) |
| 205 | return ERR_PTR(-EINTR); |
| 206 | |
| 207 | mutex_lock(&rdev->mn_lock); |
| 208 | |
| 209 | hash_for_each_possible(rdev->mn_hash, rmn, node, (unsigned long)mm) |
| 210 | if (rmn->mm == mm) |
| 211 | goto release_locks; |
| 212 | |
| 213 | rmn = kzalloc(sizeof(*rmn), GFP_KERNEL); |
| 214 | if (!rmn) { |
| 215 | rmn = ERR_PTR(-ENOMEM); |
| 216 | goto release_locks; |
| 217 | } |
| 218 | |
| 219 | rmn->rdev = rdev; |
| 220 | rmn->mm = mm; |
| 221 | rmn->mn.ops = &radeon_mn_ops; |
| 222 | mutex_init(&rmn->lock); |
| 223 | rmn->objects = RB_ROOT_CACHED; |
| 224 | |
| 225 | r = __mmu_notifier_register(&rmn->mn, mm); |
| 226 | if (r) |
| 227 | goto free_rmn; |
| 228 | |
| 229 | hash_add(rdev->mn_hash, &rmn->node, (unsigned long)mm); |
| 230 | |
| 231 | release_locks: |
| 232 | mutex_unlock(&rdev->mn_lock); |
| 233 | up_write(&mm->mmap_sem); |
| 234 | |
| 235 | return rmn; |
| 236 | |
| 237 | free_rmn: |
| 238 | mutex_unlock(&rdev->mn_lock); |
| 239 | up_write(&mm->mmap_sem); |
| 240 | kfree(rmn); |
| 241 | |
| 242 | return ERR_PTR(r); |
| 243 | } |
| 244 | |
| 245 | /** |
| 246 | * radeon_mn_register - register a BO for notifier updates |
| 247 | * |
| 248 | * @bo: radeon buffer object |
| 249 | * @addr: userptr addr we should monitor |
| 250 | * |
| 251 | * Registers an MMU notifier for the given BO at the specified address. |
| 252 | * Returns 0 on success, -ERRNO if anything goes wrong. |
| 253 | */ |
| 254 | int radeon_mn_register(struct radeon_bo *bo, unsigned long addr) |
| 255 | { |
| 256 | unsigned long end = addr + radeon_bo_size(bo) - 1; |
| 257 | struct radeon_device *rdev = bo->rdev; |
| 258 | struct radeon_mn *rmn; |
| 259 | struct radeon_mn_node *node = NULL; |
| 260 | struct list_head bos; |
| 261 | struct interval_tree_node *it; |
| 262 | |
| 263 | rmn = radeon_mn_get(rdev); |
| 264 | if (IS_ERR(rmn)) |
| 265 | return PTR_ERR(rmn); |
| 266 | |
| 267 | INIT_LIST_HEAD(&bos); |
| 268 | |
| 269 | mutex_lock(&rmn->lock); |
| 270 | |
| 271 | while ((it = interval_tree_iter_first(&rmn->objects, addr, end))) { |
| 272 | kfree(node); |
| 273 | node = container_of(it, struct radeon_mn_node, it); |
| 274 | interval_tree_remove(&node->it, &rmn->objects); |
| 275 | addr = min(it->start, addr); |
| 276 | end = max(it->last, end); |
| 277 | list_splice(&node->bos, &bos); |
| 278 | } |
| 279 | |
| 280 | if (!node) { |
| 281 | node = kmalloc(sizeof(struct radeon_mn_node), GFP_KERNEL); |
| 282 | if (!node) { |
| 283 | mutex_unlock(&rmn->lock); |
| 284 | return -ENOMEM; |
| 285 | } |
| 286 | } |
| 287 | |
| 288 | bo->mn = rmn; |
| 289 | |
| 290 | node->it.start = addr; |
| 291 | node->it.last = end; |
| 292 | INIT_LIST_HEAD(&node->bos); |
| 293 | list_splice(&bos, &node->bos); |
| 294 | list_add(&bo->mn_list, &node->bos); |
| 295 | |
| 296 | interval_tree_insert(&node->it, &rmn->objects); |
| 297 | |
| 298 | mutex_unlock(&rmn->lock); |
| 299 | |
| 300 | return 0; |
| 301 | } |
| 302 | |
| 303 | /** |
| 304 | * radeon_mn_unregister - unregister a BO for notifier updates |
| 305 | * |
| 306 | * @bo: radeon buffer object |
| 307 | * |
| 308 | * Remove any registration of MMU notifier updates from the buffer object. |
| 309 | */ |
| 310 | void radeon_mn_unregister(struct radeon_bo *bo) |
| 311 | { |
| 312 | struct radeon_device *rdev = bo->rdev; |
| 313 | struct radeon_mn *rmn; |
| 314 | struct list_head *head; |
| 315 | |
| 316 | mutex_lock(&rdev->mn_lock); |
| 317 | rmn = bo->mn; |
| 318 | if (rmn == NULL) { |
| 319 | mutex_unlock(&rdev->mn_lock); |
| 320 | return; |
| 321 | } |
| 322 | |
| 323 | mutex_lock(&rmn->lock); |
| 324 | /* save the next list entry for later */ |
| 325 | head = bo->mn_list.next; |
| 326 | |
| 327 | bo->mn = NULL; |
| 328 | list_del(&bo->mn_list); |
| 329 | |
| 330 | if (list_empty(head)) { |
| 331 | struct radeon_mn_node *node; |
| 332 | node = container_of(head, struct radeon_mn_node, bos); |
| 333 | interval_tree_remove(&node->it, &rmn->objects); |
| 334 | kfree(node); |
| 335 | } |
| 336 | |
| 337 | mutex_unlock(&rmn->lock); |
| 338 | mutex_unlock(&rdev->mn_lock); |
| 339 | } |