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 #include <drm/drmP.h> 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 = reservation_object_wait_timeout_rcu(bo->tbo.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 } 340