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 /** 57 * radeon_mn_destroy - destroy the rmn 58 * 59 * @work: previously sheduled work item 60 * 61 * Lazy destroys the notifier from a work item 62 */ 63 static void radeon_mn_destroy(struct work_struct *work) 64 { 65 struct radeon_mn *rmn = container_of(work, struct radeon_mn, work); 66 struct radeon_device *rdev = rmn->rdev; 67 struct radeon_bo *bo, *next; 68 69 mutex_lock(&rdev->mn_lock); 70 mutex_lock(&rmn->lock); 71 hash_del(&rmn->node); 72 rbtree_postorder_for_each_entry_safe(bo, next, &rmn->objects, mn_it.rb) { 73 interval_tree_remove(&bo->mn_it, &rmn->objects); 74 bo->mn = NULL; 75 } 76 mutex_unlock(&rmn->lock); 77 mutex_unlock(&rdev->mn_lock); 78 mmu_notifier_unregister(&rmn->mn, rmn->mm); 79 kfree(rmn); 80 } 81 82 /** 83 * radeon_mn_release - callback to notify about mm destruction 84 * 85 * @mn: our notifier 86 * @mn: the mm this callback is about 87 * 88 * Shedule a work item to lazy destroy our notifier. 89 */ 90 static void radeon_mn_release(struct mmu_notifier *mn, 91 struct mm_struct *mm) 92 { 93 struct radeon_mn *rmn = container_of(mn, struct radeon_mn, mn); 94 INIT_WORK(&rmn->work, radeon_mn_destroy); 95 schedule_work(&rmn->work); 96 } 97 98 /** 99 * radeon_mn_invalidate_range_start - callback to notify about mm change 100 * 101 * @mn: our notifier 102 * @mn: the mm this callback is about 103 * @start: start of updated range 104 * @end: end of updated range 105 * 106 * We block for all BOs between start and end to be idle and 107 * unmap them by move them into system domain again. 108 */ 109 static void radeon_mn_invalidate_range_start(struct mmu_notifier *mn, 110 struct mm_struct *mm, 111 unsigned long start, 112 unsigned long end) 113 { 114 struct radeon_mn *rmn = container_of(mn, struct radeon_mn, mn); 115 struct interval_tree_node *it; 116 117 /* notification is exclusive, but interval is inclusive */ 118 end -= 1; 119 120 mutex_lock(&rmn->lock); 121 122 it = interval_tree_iter_first(&rmn->objects, start, end); 123 while (it) { 124 struct radeon_bo *bo; 125 int r; 126 127 bo = container_of(it, struct radeon_bo, mn_it); 128 it = interval_tree_iter_next(it, start, end); 129 130 r = radeon_bo_reserve(bo, true); 131 if (r) { 132 DRM_ERROR("(%d) failed to reserve user bo\n", r); 133 continue; 134 } 135 136 r = reservation_object_wait_timeout_rcu(bo->tbo.resv, true, 137 false, MAX_SCHEDULE_TIMEOUT); 138 if (r) 139 DRM_ERROR("(%d) failed to wait for user bo\n", r); 140 141 radeon_ttm_placement_from_domain(bo, RADEON_GEM_DOMAIN_CPU); 142 r = ttm_bo_validate(&bo->tbo, &bo->placement, false, false); 143 if (r) 144 DRM_ERROR("(%d) failed to validate user bo\n", r); 145 146 radeon_bo_unreserve(bo); 147 } 148 149 mutex_unlock(&rmn->lock); 150 } 151 152 static const struct mmu_notifier_ops radeon_mn_ops = { 153 .release = radeon_mn_release, 154 .invalidate_range_start = radeon_mn_invalidate_range_start, 155 }; 156 157 /** 158 * radeon_mn_get - create notifier context 159 * 160 * @rdev: radeon device pointer 161 * 162 * Creates a notifier context for current->mm. 163 */ 164 static struct radeon_mn *radeon_mn_get(struct radeon_device *rdev) 165 { 166 struct mm_struct *mm = current->mm; 167 struct radeon_mn *rmn; 168 int r; 169 170 down_write(&mm->mmap_sem); 171 mutex_lock(&rdev->mn_lock); 172 173 hash_for_each_possible(rdev->mn_hash, rmn, node, (unsigned long)mm) 174 if (rmn->mm == mm) 175 goto release_locks; 176 177 rmn = kzalloc(sizeof(*rmn), GFP_KERNEL); 178 if (!rmn) { 179 rmn = ERR_PTR(-ENOMEM); 180 goto release_locks; 181 } 182 183 rmn->rdev = rdev; 184 rmn->mm = mm; 185 rmn->mn.ops = &radeon_mn_ops; 186 mutex_init(&rmn->lock); 187 rmn->objects = RB_ROOT; 188 189 r = __mmu_notifier_register(&rmn->mn, mm); 190 if (r) 191 goto free_rmn; 192 193 hash_add(rdev->mn_hash, &rmn->node, (unsigned long)mm); 194 195 release_locks: 196 mutex_unlock(&rdev->mn_lock); 197 up_write(&mm->mmap_sem); 198 199 return rmn; 200 201 free_rmn: 202 mutex_unlock(&rdev->mn_lock); 203 up_write(&mm->mmap_sem); 204 kfree(rmn); 205 206 return ERR_PTR(r); 207 } 208 209 /** 210 * radeon_mn_register - register a BO for notifier updates 211 * 212 * @bo: radeon buffer object 213 * @addr: userptr addr we should monitor 214 * 215 * Registers an MMU notifier for the given BO at the specified address. 216 * Returns 0 on success, -ERRNO if anything goes wrong. 217 */ 218 int radeon_mn_register(struct radeon_bo *bo, unsigned long addr) 219 { 220 unsigned long end = addr + radeon_bo_size(bo) - 1; 221 struct radeon_device *rdev = bo->rdev; 222 struct radeon_mn *rmn; 223 struct interval_tree_node *it; 224 225 rmn = radeon_mn_get(rdev); 226 if (IS_ERR(rmn)) 227 return PTR_ERR(rmn); 228 229 mutex_lock(&rmn->lock); 230 231 it = interval_tree_iter_first(&rmn->objects, addr, end); 232 if (it) { 233 mutex_unlock(&rmn->lock); 234 return -EEXIST; 235 } 236 237 bo->mn = rmn; 238 bo->mn_it.start = addr; 239 bo->mn_it.last = end; 240 interval_tree_insert(&bo->mn_it, &rmn->objects); 241 242 mutex_unlock(&rmn->lock); 243 244 return 0; 245 } 246 247 /** 248 * radeon_mn_unregister - unregister a BO for notifier updates 249 * 250 * @bo: radeon buffer object 251 * 252 * Remove any registration of MMU notifier updates from the buffer object. 253 */ 254 void radeon_mn_unregister(struct radeon_bo *bo) 255 { 256 struct radeon_device *rdev = bo->rdev; 257 struct radeon_mn *rmn; 258 259 mutex_lock(&rdev->mn_lock); 260 rmn = bo->mn; 261 if (rmn == NULL) { 262 mutex_unlock(&rdev->mn_lock); 263 return; 264 } 265 266 mutex_lock(&rmn->lock); 267 interval_tree_remove(&bo->mn_it, &rmn->objects); 268 bo->mn = NULL; 269 mutex_unlock(&rmn->lock); 270 mutex_unlock(&rdev->mn_lock); 271 } 272