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 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, &rmn->objects, 79 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 void radeon_mn_invalidate_range_start(struct mmu_notifier *mn, 122 struct mm_struct *mm, 123 unsigned long start, 124 unsigned long end) 125 { 126 struct radeon_mn *rmn = container_of(mn, struct radeon_mn, mn); 127 struct interval_tree_node *it; 128 129 /* notification is exclusive, but interval is inclusive */ 130 end -= 1; 131 132 mutex_lock(&rmn->lock); 133 134 it = interval_tree_iter_first(&rmn->objects, start, end); 135 while (it) { 136 struct radeon_mn_node *node; 137 struct radeon_bo *bo; 138 long r; 139 140 node = container_of(it, struct radeon_mn_node, it); 141 it = interval_tree_iter_next(it, start, end); 142 143 list_for_each_entry(bo, &node->bos, mn_list) { 144 145 r = radeon_bo_reserve(bo, true); 146 if (r) { 147 DRM_ERROR("(%ld) failed to reserve user bo\n", r); 148 continue; 149 } 150 151 r = reservation_object_wait_timeout_rcu(bo->tbo.resv, 152 true, false, MAX_SCHEDULE_TIMEOUT); 153 if (r <= 0) 154 DRM_ERROR("(%ld) failed to wait for user bo\n", r); 155 156 radeon_ttm_placement_from_domain(bo, RADEON_GEM_DOMAIN_CPU); 157 r = ttm_bo_validate(&bo->tbo, &bo->placement, false, false); 158 if (r) 159 DRM_ERROR("(%ld) failed to validate user bo\n", r); 160 161 radeon_bo_unreserve(bo); 162 } 163 } 164 165 mutex_unlock(&rmn->lock); 166 } 167 168 static const struct mmu_notifier_ops radeon_mn_ops = { 169 .release = radeon_mn_release, 170 .invalidate_range_start = radeon_mn_invalidate_range_start, 171 }; 172 173 /** 174 * radeon_mn_get - create notifier context 175 * 176 * @rdev: radeon device pointer 177 * 178 * Creates a notifier context for current->mm. 179 */ 180 static struct radeon_mn *radeon_mn_get(struct radeon_device *rdev) 181 { 182 struct mm_struct *mm = current->mm; 183 struct radeon_mn *rmn; 184 int r; 185 186 down_write(&mm->mmap_sem); 187 mutex_lock(&rdev->mn_lock); 188 189 hash_for_each_possible(rdev->mn_hash, rmn, node, (unsigned long)mm) 190 if (rmn->mm == mm) 191 goto release_locks; 192 193 rmn = kzalloc(sizeof(*rmn), GFP_KERNEL); 194 if (!rmn) { 195 rmn = ERR_PTR(-ENOMEM); 196 goto release_locks; 197 } 198 199 rmn->rdev = rdev; 200 rmn->mm = mm; 201 rmn->mn.ops = &radeon_mn_ops; 202 mutex_init(&rmn->lock); 203 rmn->objects = RB_ROOT; 204 205 r = __mmu_notifier_register(&rmn->mn, mm); 206 if (r) 207 goto free_rmn; 208 209 hash_add(rdev->mn_hash, &rmn->node, (unsigned long)mm); 210 211 release_locks: 212 mutex_unlock(&rdev->mn_lock); 213 up_write(&mm->mmap_sem); 214 215 return rmn; 216 217 free_rmn: 218 mutex_unlock(&rdev->mn_lock); 219 up_write(&mm->mmap_sem); 220 kfree(rmn); 221 222 return ERR_PTR(r); 223 } 224 225 /** 226 * radeon_mn_register - register a BO for notifier updates 227 * 228 * @bo: radeon buffer object 229 * @addr: userptr addr we should monitor 230 * 231 * Registers an MMU notifier for the given BO at the specified address. 232 * Returns 0 on success, -ERRNO if anything goes wrong. 233 */ 234 int radeon_mn_register(struct radeon_bo *bo, unsigned long addr) 235 { 236 unsigned long end = addr + radeon_bo_size(bo) - 1; 237 struct radeon_device *rdev = bo->rdev; 238 struct radeon_mn *rmn; 239 struct radeon_mn_node *node = NULL; 240 struct list_head bos; 241 struct interval_tree_node *it; 242 243 rmn = radeon_mn_get(rdev); 244 if (IS_ERR(rmn)) 245 return PTR_ERR(rmn); 246 247 INIT_LIST_HEAD(&bos); 248 249 mutex_lock(&rmn->lock); 250 251 while ((it = interval_tree_iter_first(&rmn->objects, addr, end))) { 252 kfree(node); 253 node = container_of(it, struct radeon_mn_node, it); 254 interval_tree_remove(&node->it, &rmn->objects); 255 addr = min(it->start, addr); 256 end = max(it->last, end); 257 list_splice(&node->bos, &bos); 258 } 259 260 if (!node) { 261 node = kmalloc(sizeof(struct radeon_mn_node), GFP_KERNEL); 262 if (!node) { 263 mutex_unlock(&rmn->lock); 264 return -ENOMEM; 265 } 266 } 267 268 bo->mn = rmn; 269 270 node->it.start = addr; 271 node->it.last = end; 272 INIT_LIST_HEAD(&node->bos); 273 list_splice(&bos, &node->bos); 274 list_add(&bo->mn_list, &node->bos); 275 276 interval_tree_insert(&node->it, &rmn->objects); 277 278 mutex_unlock(&rmn->lock); 279 280 return 0; 281 } 282 283 /** 284 * radeon_mn_unregister - unregister a BO for notifier updates 285 * 286 * @bo: radeon buffer object 287 * 288 * Remove any registration of MMU notifier updates from the buffer object. 289 */ 290 void radeon_mn_unregister(struct radeon_bo *bo) 291 { 292 struct radeon_device *rdev = bo->rdev; 293 struct radeon_mn *rmn; 294 struct list_head *head; 295 296 mutex_lock(&rdev->mn_lock); 297 rmn = bo->mn; 298 if (rmn == NULL) { 299 mutex_unlock(&rdev->mn_lock); 300 return; 301 } 302 303 mutex_lock(&rmn->lock); 304 /* save the next list entry for later */ 305 head = bo->mn_list.next; 306 307 bo->mn = NULL; 308 list_del(&bo->mn_list); 309 310 if (list_empty(head)) { 311 struct radeon_mn_node *node; 312 node = container_of(head, struct radeon_mn_node, bos); 313 interval_tree_remove(&node->it, &rmn->objects); 314 kfree(node); 315 } 316 317 mutex_unlock(&rmn->lock); 318 mutex_unlock(&rdev->mn_lock); 319 } 320