1 /* $NetBSD: radeon_mn.c,v 1.2 2018/08/27 04:58:36 riastradh Exp $ */ 2 3 /* 4 * Copyright 2014 Advanced Micro Devices, Inc. 5 * All Rights Reserved. 6 * 7 * Permission is hereby granted, free of charge, to any person obtaining a 8 * copy of this software and associated documentation files (the 9 * "Software"), to deal in the Software without restriction, including 10 * without limitation the rights to use, copy, modify, merge, publish, 11 * distribute, sub license, and/or sell copies of the Software, and to 12 * permit persons to whom the Software is furnished to do so, subject to 13 * the following conditions: 14 * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL 18 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, 19 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR 20 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE 21 * USE OR OTHER DEALINGS IN THE SOFTWARE. 22 * 23 * The above copyright notice and this permission notice (including the 24 * next paragraph) shall be included in all copies or substantial portions 25 * of the Software. 26 * 27 */ 28 /* 29 * Authors: 30 * Christian König <christian.koenig@amd.com> 31 */ 32 33 #include <sys/cdefs.h> 34 __KERNEL_RCSID(0, "$NetBSD: radeon_mn.c,v 1.2 2018/08/27 04:58:36 riastradh Exp $"); 35 36 #include <linux/firmware.h> 37 #include <linux/module.h> 38 #include <linux/mmu_notifier.h> 39 #include <drm/drmP.h> 40 #include <drm/drm.h> 41 42 #include "radeon.h" 43 44 struct radeon_mn { 45 /* constant after initialisation */ 46 struct radeon_device *rdev; 47 struct mm_struct *mm; 48 struct mmu_notifier mn; 49 50 /* only used on destruction */ 51 struct work_struct work; 52 53 /* protected by rdev->mn_lock */ 54 struct hlist_node node; 55 56 /* objects protected by lock */ 57 struct mutex lock; 58 struct rb_root objects; 59 }; 60 61 struct radeon_mn_node { 62 struct interval_tree_node it; 63 struct list_head bos; 64 }; 65 66 /** 67 * radeon_mn_destroy - destroy the rmn 68 * 69 * @work: previously sheduled work item 70 * 71 * Lazy destroys the notifier from a work item 72 */ 73 static void radeon_mn_destroy(struct work_struct *work) 74 { 75 struct radeon_mn *rmn = container_of(work, struct radeon_mn, work); 76 struct radeon_device *rdev = rmn->rdev; 77 struct radeon_mn_node *node, *next_node; 78 struct radeon_bo *bo, *next_bo; 79 80 mutex_lock(&rdev->mn_lock); 81 mutex_lock(&rmn->lock); 82 hash_del(&rmn->node); 83 rbtree_postorder_for_each_entry_safe(node, next_node, &rmn->objects, 84 it.rb) { 85 86 interval_tree_remove(&node->it, &rmn->objects); 87 list_for_each_entry_safe(bo, next_bo, &node->bos, mn_list) { 88 bo->mn = NULL; 89 list_del_init(&bo->mn_list); 90 } 91 kfree(node); 92 } 93 mutex_unlock(&rmn->lock); 94 mutex_unlock(&rdev->mn_lock); 95 mmu_notifier_unregister(&rmn->mn, rmn->mm); 96 kfree(rmn); 97 } 98 99 /** 100 * radeon_mn_release - callback to notify about mm destruction 101 * 102 * @mn: our notifier 103 * @mn: the mm this callback is about 104 * 105 * Shedule a work item to lazy destroy our notifier. 106 */ 107 static void radeon_mn_release(struct mmu_notifier *mn, 108 struct mm_struct *mm) 109 { 110 struct radeon_mn *rmn = container_of(mn, struct radeon_mn, mn); 111 INIT_WORK(&rmn->work, radeon_mn_destroy); 112 schedule_work(&rmn->work); 113 } 114 115 /** 116 * radeon_mn_invalidate_range_start - callback to notify about mm change 117 * 118 * @mn: our notifier 119 * @mn: the mm this callback is about 120 * @start: start of updated range 121 * @end: end of updated range 122 * 123 * We block for all BOs between start and end to be idle and 124 * unmap them by move them into system domain again. 125 */ 126 static void radeon_mn_invalidate_range_start(struct mmu_notifier *mn, 127 struct mm_struct *mm, 128 unsigned long start, 129 unsigned long end) 130 { 131 struct radeon_mn *rmn = container_of(mn, struct radeon_mn, mn); 132 struct interval_tree_node *it; 133 134 /* notification is exclusive, but interval is inclusive */ 135 end -= 1; 136 137 mutex_lock(&rmn->lock); 138 139 it = interval_tree_iter_first(&rmn->objects, start, end); 140 while (it) { 141 struct radeon_mn_node *node; 142 struct radeon_bo *bo; 143 long r; 144 145 node = container_of(it, struct radeon_mn_node, it); 146 it = interval_tree_iter_next(it, start, end); 147 148 list_for_each_entry(bo, &node->bos, mn_list) { 149 150 if (!bo->tbo.ttm || bo->tbo.ttm->state != tt_bound) 151 continue; 152 153 r = radeon_bo_reserve(bo, true); 154 if (r) { 155 DRM_ERROR("(%ld) failed to reserve user bo\n", r); 156 continue; 157 } 158 159 r = reservation_object_wait_timeout_rcu(bo->tbo.resv, 160 true, false, MAX_SCHEDULE_TIMEOUT); 161 if (r <= 0) 162 DRM_ERROR("(%ld) failed to wait for user bo\n", r); 163 164 radeon_ttm_placement_from_domain(bo, RADEON_GEM_DOMAIN_CPU); 165 r = ttm_bo_validate(&bo->tbo, &bo->placement, false, false); 166 if (r) 167 DRM_ERROR("(%ld) failed to validate user bo\n", r); 168 169 radeon_bo_unreserve(bo); 170 } 171 } 172 173 mutex_unlock(&rmn->lock); 174 } 175 176 static const struct mmu_notifier_ops radeon_mn_ops = { 177 .release = radeon_mn_release, 178 .invalidate_range_start = radeon_mn_invalidate_range_start, 179 }; 180 181 /** 182 * radeon_mn_get - create notifier context 183 * 184 * @rdev: radeon device pointer 185 * 186 * Creates a notifier context for current->mm. 187 */ 188 static struct radeon_mn *radeon_mn_get(struct radeon_device *rdev) 189 { 190 struct mm_struct *mm = current->mm; 191 struct radeon_mn *rmn; 192 int r; 193 194 down_write(&mm->mmap_sem); 195 mutex_lock(&rdev->mn_lock); 196 197 hash_for_each_possible(rdev->mn_hash, rmn, node, (unsigned long)mm) 198 if (rmn->mm == mm) 199 goto release_locks; 200 201 rmn = kzalloc(sizeof(*rmn), GFP_KERNEL); 202 if (!rmn) { 203 rmn = ERR_PTR(-ENOMEM); 204 goto release_locks; 205 } 206 207 rmn->rdev = rdev; 208 rmn->mm = mm; 209 rmn->mn.ops = &radeon_mn_ops; 210 mutex_init(&rmn->lock); 211 rmn->objects = RB_ROOT; 212 213 r = __mmu_notifier_register(&rmn->mn, mm); 214 if (r) 215 goto free_rmn; 216 217 hash_add(rdev->mn_hash, &rmn->node, (unsigned long)mm); 218 219 release_locks: 220 mutex_unlock(&rdev->mn_lock); 221 up_write(&mm->mmap_sem); 222 223 return rmn; 224 225 free_rmn: 226 mutex_unlock(&rdev->mn_lock); 227 up_write(&mm->mmap_sem); 228 kfree(rmn); 229 230 return ERR_PTR(r); 231 } 232 233 /** 234 * radeon_mn_register - register a BO for notifier updates 235 * 236 * @bo: radeon buffer object 237 * @addr: userptr addr we should monitor 238 * 239 * Registers an MMU notifier for the given BO at the specified address. 240 * Returns 0 on success, -ERRNO if anything goes wrong. 241 */ 242 int radeon_mn_register(struct radeon_bo *bo, unsigned long addr) 243 { 244 unsigned long end = addr + radeon_bo_size(bo) - 1; 245 struct radeon_device *rdev = bo->rdev; 246 struct radeon_mn *rmn; 247 struct radeon_mn_node *node = NULL; 248 struct list_head bos; 249 struct interval_tree_node *it; 250 251 rmn = radeon_mn_get(rdev); 252 if (IS_ERR(rmn)) 253 return PTR_ERR(rmn); 254 255 INIT_LIST_HEAD(&bos); 256 257 mutex_lock(&rmn->lock); 258 259 while ((it = interval_tree_iter_first(&rmn->objects, addr, end))) { 260 kfree(node); 261 node = container_of(it, struct radeon_mn_node, it); 262 interval_tree_remove(&node->it, &rmn->objects); 263 addr = min(it->start, addr); 264 end = max(it->last, end); 265 list_splice(&node->bos, &bos); 266 } 267 268 if (!node) { 269 node = kmalloc(sizeof(struct radeon_mn_node), GFP_KERNEL); 270 if (!node) { 271 mutex_unlock(&rmn->lock); 272 return -ENOMEM; 273 } 274 } 275 276 bo->mn = rmn; 277 278 node->it.start = addr; 279 node->it.last = end; 280 INIT_LIST_HEAD(&node->bos); 281 list_splice(&bos, &node->bos); 282 list_add(&bo->mn_list, &node->bos); 283 284 interval_tree_insert(&node->it, &rmn->objects); 285 286 mutex_unlock(&rmn->lock); 287 288 return 0; 289 } 290 291 /** 292 * radeon_mn_unregister - unregister a BO for notifier updates 293 * 294 * @bo: radeon buffer object 295 * 296 * Remove any registration of MMU notifier updates from the buffer object. 297 */ 298 void radeon_mn_unregister(struct radeon_bo *bo) 299 { 300 struct radeon_device *rdev = bo->rdev; 301 struct radeon_mn *rmn; 302 struct list_head *head; 303 304 mutex_lock(&rdev->mn_lock); 305 rmn = bo->mn; 306 if (rmn == NULL) { 307 mutex_unlock(&rdev->mn_lock); 308 return; 309 } 310 311 mutex_lock(&rmn->lock); 312 /* save the next list entry for later */ 313 head = bo->mn_list.next; 314 315 bo->mn = NULL; 316 list_del(&bo->mn_list); 317 318 if (list_empty(head)) { 319 struct radeon_mn_node *node; 320 node = container_of(head, struct radeon_mn_node, bos); 321 interval_tree_remove(&node->it, &rmn->objects); 322 kfree(node); 323 } 324 325 mutex_unlock(&rmn->lock); 326 mutex_unlock(&rdev->mn_lock); 327 } 328