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 lock lock; 53 struct rb_root objects; 54 }; 55 56 #if 0 57 /** 58 * radeon_mn_destroy - destroy the rmn 59 * 60 * @work: previously sheduled work item 61 * 62 * Lazy destroys the notifier from a work item 63 */ 64 static void radeon_mn_destroy(struct work_struct *work) 65 { 66 struct radeon_mn *rmn = container_of(work, struct radeon_mn, work); 67 struct radeon_device *rdev = rmn->rdev; 68 struct radeon_bo *bo, *next; 69 70 mutex_lock(&rdev->mn_lock); 71 mutex_lock(&rmn->lock); 72 hash_del(&rmn->node); 73 rbtree_postorder_for_each_entry_safe(bo, next, &rmn->objects, mn_it.rb) { 74 interval_tree_remove(&bo->mn_it, &rmn->objects); 75 bo->mn = NULL; 76 } 77 mutex_unlock(&rmn->lock); 78 mutex_unlock(&rdev->mn_lock); 79 mmu_notifier_unregister(&rmn->mn, rmn->mm); 80 kfree(rmn); 81 } 82 83 /** 84 * radeon_mn_release - callback to notify about mm destruction 85 * 86 * @mn: our notifier 87 * @mn: the mm this callback is about 88 * 89 * Shedule a work item to lazy destroy our notifier. 90 */ 91 static void radeon_mn_release(struct mmu_notifier *mn, 92 struct mm_struct *mm) 93 { 94 struct radeon_mn *rmn = container_of(mn, struct radeon_mn, mn); 95 INIT_WORK(&rmn->work, radeon_mn_destroy); 96 schedule_work(&rmn->work); 97 } 98 99 /** 100 * radeon_mn_invalidate_range_start - callback to notify about mm change 101 * 102 * @mn: our notifier 103 * @mn: the mm this callback is about 104 * @start: start of updated range 105 * @end: end of updated range 106 * 107 * We block for all BOs between start and end to be idle and 108 * unmap them by move them into system domain again. 109 */ 110 static void radeon_mn_invalidate_range_start(struct mmu_notifier *mn, 111 struct mm_struct *mm, 112 unsigned long start, 113 unsigned long end) 114 { 115 struct radeon_mn *rmn = container_of(mn, struct radeon_mn, mn); 116 struct interval_tree_node *it; 117 118 /* notification is exclusive, but interval is inclusive */ 119 end -= 1; 120 121 mutex_lock(&rmn->lock); 122 123 it = interval_tree_iter_first(&rmn->objects, start, end); 124 while (it) { 125 struct radeon_bo *bo; 126 struct fence *fence; 127 int r; 128 129 bo = container_of(it, struct radeon_bo, mn_it); 130 it = interval_tree_iter_next(it, start, end); 131 132 r = radeon_bo_reserve(bo, true); 133 if (r) { 134 DRM_ERROR("(%d) failed to reserve user bo\n", r); 135 continue; 136 } 137 138 fence = reservation_object_get_excl(bo->tbo.resv); 139 if (fence) { 140 r = radeon_fence_wait((struct radeon_fence *)fence, false); 141 if (r) 142 DRM_ERROR("(%d) failed to wait for user bo\n", r); 143 } 144 145 radeon_ttm_placement_from_domain(bo, RADEON_GEM_DOMAIN_CPU); 146 r = ttm_bo_validate(&bo->tbo, &bo->placement, false, false); 147 if (r) 148 DRM_ERROR("(%d) failed to validate user bo\n", r); 149 150 radeon_bo_unreserve(bo); 151 } 152 153 mutex_unlock(&rmn->lock); 154 } 155 156 static const struct mmu_notifier_ops radeon_mn_ops = { 157 .release = radeon_mn_release, 158 .invalidate_range_start = radeon_mn_invalidate_range_start, 159 }; 160 #endif 161 162 /** 163 * radeon_mn_get - create notifier context 164 * 165 * @rdev: radeon device pointer 166 * 167 * Creates a notifier context for current->mm. 168 */ 169 static struct radeon_mn *radeon_mn_get(struct radeon_device *rdev) 170 { 171 #if 0 172 struct mm_struct *mm = current->mm; 173 struct radeon_mn *rmn; 174 int r; 175 176 down_write(&mm->mmap_sem); 177 mutex_lock(&rdev->mn_lock); 178 179 hash_for_each_possible(rdev->mn_hash, rmn, node, (unsigned long)mm) 180 if (rmn->mm == mm) 181 goto release_locks; 182 183 rmn = kzalloc(sizeof(*rmn), GFP_KERNEL); 184 if (!rmn) { 185 rmn = ERR_PTR(-ENOMEM); 186 goto release_locks; 187 } 188 189 rmn->rdev = rdev; 190 rmn->mm = mm; 191 rmn->mn.ops = &radeon_mn_ops; 192 lockinit(&rmn->lock, "drrmnl", 0, LK_CANRECURSE); 193 rmn->objects = LINUX_RB_ROOT; 194 195 r = __mmu_notifier_register(&rmn->mn, mm); 196 if (r) 197 goto free_rmn; 198 199 hash_add(rdev->mn_hash, &rmn->node, (unsigned long)mm); 200 201 release_locks: 202 mutex_unlock(&rdev->mn_lock); 203 up_write(&mm->mmap_sem); 204 205 return rmn; 206 207 free_rmn: 208 mutex_unlock(&rdev->mn_lock); 209 up_write(&mm->mmap_sem); 210 kfree(rmn); 211 212 return ERR_PTR(r); 213 #endif 214 return ERR_PTR(-EINVAL); 215 } 216 217 /** 218 * radeon_mn_register - register a BO for notifier updates 219 * 220 * @bo: radeon buffer object 221 * @addr: userptr addr we should monitor 222 * 223 * Registers an MMU notifier for the given BO at the specified address. 224 * Returns 0 on success, -ERRNO if anything goes wrong. 225 */ 226 int radeon_mn_register(struct radeon_bo *bo, unsigned long addr) 227 { 228 unsigned long end = addr + radeon_bo_size(bo) - 1; 229 struct radeon_device *rdev = bo->rdev; 230 struct radeon_mn *rmn; 231 struct interval_tree_node *it; 232 233 rmn = radeon_mn_get(rdev); 234 if (IS_ERR(rmn)) 235 return PTR_ERR(rmn); 236 237 mutex_lock(&rmn->lock); 238 239 it = interval_tree_iter_first(&rmn->objects, addr, end); 240 if (it) { 241 mutex_unlock(&rmn->lock); 242 return -EEXIST; 243 } 244 245 bo->mn = rmn; 246 bo->mn_it.start = addr; 247 bo->mn_it.last = end; 248 interval_tree_insert(&bo->mn_it, &rmn->objects); 249 250 mutex_unlock(&rmn->lock); 251 252 return 0; 253 } 254 255 /** 256 * radeon_mn_unregister - unregister a BO for notifier updates 257 * 258 * @bo: radeon buffer object 259 * 260 * Remove any registration of MMU notifier updates from the buffer object. 261 */ 262 void radeon_mn_unregister(struct radeon_bo *bo) 263 { 264 struct radeon_device *rdev = bo->rdev; 265 struct radeon_mn *rmn; 266 267 mutex_lock(&rdev->mn_lock); 268 rmn = bo->mn; 269 if (rmn == NULL) { 270 mutex_unlock(&rdev->mn_lock); 271 return; 272 } 273 274 mutex_lock(&rmn->lock); 275 interval_tree_remove(&bo->mn_it, &rmn->objects); 276 bo->mn = NULL; 277 mutex_unlock(&rmn->lock); 278 mutex_unlock(&rdev->mn_lock); 279 } 280