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 35 #include <drm/drm.h> 36 37 #include "radeon.h" 38 39 struct radeon_mn { 40 struct mmu_notifier mn; 41 42 /* objects protected by lock */ 43 struct mutex lock; 44 struct rb_root_cached objects; 45 }; 46 47 struct radeon_mn_node { 48 struct interval_tree_node it; 49 struct list_head bos; 50 }; 51 52 /** 53 * radeon_mn_invalidate_range_start - callback to notify about mm change 54 * 55 * @mn: our notifier 56 * @mn: the mm this callback is about 57 * @start: start of updated range 58 * @end: end of updated range 59 * 60 * We block for all BOs between start and end to be idle and 61 * unmap them by move them into system domain again. 62 */ 63 static int radeon_mn_invalidate_range_start(struct mmu_notifier *mn, 64 const struct mmu_notifier_range *range) 65 { 66 struct radeon_mn *rmn = container_of(mn, struct radeon_mn, mn); 67 struct ttm_operation_ctx ctx = { false, false }; 68 struct interval_tree_node *it; 69 unsigned long end; 70 int ret = 0; 71 72 /* notification is exclusive, but interval is inclusive */ 73 end = range->end - 1; 74 75 /* TODO we should be able to split locking for interval tree and 76 * the tear down. 77 */ 78 if (mmu_notifier_range_blockable(range)) 79 mutex_lock(&rmn->lock); 80 else if (!mutex_trylock(&rmn->lock)) 81 return -EAGAIN; 82 83 it = interval_tree_iter_first(&rmn->objects, range->start, end); 84 while (it) { 85 struct radeon_mn_node *node; 86 struct radeon_bo *bo; 87 long r; 88 89 if (!mmu_notifier_range_blockable(range)) { 90 ret = -EAGAIN; 91 goto out_unlock; 92 } 93 94 node = container_of(it, struct radeon_mn_node, it); 95 it = interval_tree_iter_next(it, range->start, end); 96 97 list_for_each_entry(bo, &node->bos, mn_list) { 98 99 if (!bo->tbo.ttm || bo->tbo.ttm->state != tt_bound) 100 continue; 101 102 r = radeon_bo_reserve(bo, true); 103 if (r) { 104 DRM_ERROR("(%ld) failed to reserve user bo\n", r); 105 continue; 106 } 107 108 r = dma_resv_wait_timeout_rcu(bo->tbo.base.resv, 109 true, false, MAX_SCHEDULE_TIMEOUT); 110 if (r <= 0) 111 DRM_ERROR("(%ld) failed to wait for user bo\n", r); 112 113 radeon_ttm_placement_from_domain(bo, RADEON_GEM_DOMAIN_CPU); 114 r = ttm_bo_validate(&bo->tbo, &bo->placement, &ctx); 115 if (r) 116 DRM_ERROR("(%ld) failed to validate user bo\n", r); 117 118 radeon_bo_unreserve(bo); 119 } 120 } 121 122 out_unlock: 123 mutex_unlock(&rmn->lock); 124 125 return ret; 126 } 127 128 static void radeon_mn_release(struct mmu_notifier *mn, struct mm_struct *mm) 129 { 130 struct mmu_notifier_range range = { 131 .mm = mm, 132 .start = 0, 133 .end = ULONG_MAX, 134 .flags = 0, 135 .event = MMU_NOTIFY_UNMAP, 136 }; 137 138 radeon_mn_invalidate_range_start(mn, &range); 139 } 140 141 static struct mmu_notifier *radeon_mn_alloc_notifier(struct mm_struct *mm) 142 { 143 struct radeon_mn *rmn; 144 145 rmn = kzalloc(sizeof(*rmn), GFP_KERNEL); 146 if (!rmn) 147 return ERR_PTR(-ENOMEM); 148 149 mutex_init(&rmn->lock); 150 rmn->objects = RB_ROOT_CACHED; 151 return &rmn->mn; 152 } 153 154 static void radeon_mn_free_notifier(struct mmu_notifier *mn) 155 { 156 kfree(container_of(mn, struct radeon_mn, mn)); 157 } 158 159 static const struct mmu_notifier_ops radeon_mn_ops = { 160 .release = radeon_mn_release, 161 .invalidate_range_start = radeon_mn_invalidate_range_start, 162 .alloc_notifier = radeon_mn_alloc_notifier, 163 .free_notifier = radeon_mn_free_notifier, 164 }; 165 166 /** 167 * radeon_mn_register - register a BO for notifier updates 168 * 169 * @bo: radeon buffer object 170 * @addr: userptr addr we should monitor 171 * 172 * Registers an MMU notifier for the given BO at the specified address. 173 * Returns 0 on success, -ERRNO if anything goes wrong. 174 */ 175 int radeon_mn_register(struct radeon_bo *bo, unsigned long addr) 176 { 177 unsigned long end = addr + radeon_bo_size(bo) - 1; 178 struct mmu_notifier *mn; 179 struct radeon_mn *rmn; 180 struct radeon_mn_node *node = NULL; 181 struct list_head bos; 182 struct interval_tree_node *it; 183 184 mn = mmu_notifier_get(&radeon_mn_ops, current->mm); 185 if (IS_ERR(mn)) 186 return PTR_ERR(mn); 187 rmn = container_of(mn, struct radeon_mn, mn); 188 189 INIT_LIST_HEAD(&bos); 190 191 mutex_lock(&rmn->lock); 192 193 while ((it = interval_tree_iter_first(&rmn->objects, addr, end))) { 194 kfree(node); 195 node = container_of(it, struct radeon_mn_node, it); 196 interval_tree_remove(&node->it, &rmn->objects); 197 addr = min(it->start, addr); 198 end = max(it->last, end); 199 list_splice(&node->bos, &bos); 200 } 201 202 if (!node) { 203 node = kmalloc(sizeof(struct radeon_mn_node), GFP_KERNEL); 204 if (!node) { 205 mutex_unlock(&rmn->lock); 206 return -ENOMEM; 207 } 208 } 209 210 bo->mn = rmn; 211 212 node->it.start = addr; 213 node->it.last = end; 214 INIT_LIST_HEAD(&node->bos); 215 list_splice(&bos, &node->bos); 216 list_add(&bo->mn_list, &node->bos); 217 218 interval_tree_insert(&node->it, &rmn->objects); 219 220 mutex_unlock(&rmn->lock); 221 222 return 0; 223 } 224 225 /** 226 * radeon_mn_unregister - unregister a BO for notifier updates 227 * 228 * @bo: radeon buffer object 229 * 230 * Remove any registration of MMU notifier updates from the buffer object. 231 */ 232 void radeon_mn_unregister(struct radeon_bo *bo) 233 { 234 struct radeon_mn *rmn = bo->mn; 235 struct list_head *head; 236 237 if (!rmn) 238 return; 239 240 mutex_lock(&rmn->lock); 241 /* save the next list entry for later */ 242 head = bo->mn_list.next; 243 244 list_del(&bo->mn_list); 245 246 if (list_empty(head)) { 247 struct radeon_mn_node *node; 248 node = container_of(head, struct radeon_mn_node, bos); 249 interval_tree_remove(&node->it, &rmn->objects); 250 kfree(node); 251 } 252 253 mutex_unlock(&rmn->lock); 254 255 mmu_notifier_put(&rmn->mn); 256 bo->mn = NULL; 257 } 258