2 * Copyright 2014 Advanced Micro Devices, Inc.
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:
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.
21 * The above copyright notice and this permission notice (including the
22 * next paragraph) shall be included in all copies or substantial portions
28 * Christian König <christian.koenig@amd.com>
31 #include <linux/firmware.h>
32 #include <linux/module.h>
33 #include <linux/mmu_notifier.h>
40 /* constant after initialisation */
41 struct radeon_device *rdev;
43 struct mmu_notifier mn;
45 /* only used on destruction */
46 struct work_struct work;
48 /* protected by rdev->mn_lock */
49 struct hlist_node node;
51 /* objects protected by lock */
53 struct rb_root objects;
56 struct radeon_mn_node {
57 struct interval_tree_node it;
62 * radeon_mn_destroy - destroy the rmn
64 * @work: previously sheduled work item
66 * Lazy destroys the notifier from a work item
68 static void radeon_mn_destroy(struct work_struct *work)
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;
75 mutex_lock(&rdev->mn_lock);
76 mutex_lock(&rmn->lock);
78 rbtree_postorder_for_each_entry_safe(node, next_node, &rmn->objects,
81 interval_tree_remove(&node->it, &rmn->objects);
82 list_for_each_entry_safe(bo, next_bo, &node->bos, mn_list) {
84 list_del_init(&bo->mn_list);
88 mutex_unlock(&rmn->lock);
89 mutex_unlock(&rdev->mn_lock);
90 mmu_notifier_unregister(&rmn->mn, rmn->mm);
95 * radeon_mn_release - callback to notify about mm destruction
98 * @mn: the mm this callback is about
100 * Shedule a work item to lazy destroy our notifier.
102 static void radeon_mn_release(struct mmu_notifier *mn,
103 struct mm_struct *mm)
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);
111 * radeon_mn_invalidate_range_start - callback to notify about mm change
114 * @mn: the mm this callback is about
115 * @start: start of updated range
116 * @end: end of updated range
118 * We block for all BOs between start and end to be idle and
119 * unmap them by move them into system domain again.
121 static void radeon_mn_invalidate_range_start(struct mmu_notifier *mn,
122 struct mm_struct *mm,
126 struct radeon_mn *rmn = container_of(mn, struct radeon_mn, mn);
127 struct interval_tree_node *it;
129 /* notification is exclusive, but interval is inclusive */
132 mutex_lock(&rmn->lock);
134 it = interval_tree_iter_first(&rmn->objects, start, end);
136 struct radeon_mn_node *node;
137 struct radeon_bo *bo;
140 node = container_of(it, struct radeon_mn_node, it);
141 it = interval_tree_iter_next(it, start, end);
143 list_for_each_entry(bo, &node->bos, mn_list) {
145 r = radeon_bo_reserve(bo, true);
147 DRM_ERROR("(%ld) failed to reserve user bo\n", r);
151 r = reservation_object_wait_timeout_rcu(bo->tbo.resv,
152 true, false, MAX_SCHEDULE_TIMEOUT);
154 DRM_ERROR("(%ld) failed to wait for user bo\n", r);
156 radeon_ttm_placement_from_domain(bo, RADEON_GEM_DOMAIN_CPU);
157 r = ttm_bo_validate(&bo->tbo, &bo->placement, false, false);
159 DRM_ERROR("(%ld) failed to validate user bo\n", r);
161 radeon_bo_unreserve(bo);
165 mutex_unlock(&rmn->lock);
168 static const struct mmu_notifier_ops radeon_mn_ops = {
169 .release = radeon_mn_release,
170 .invalidate_range_start = radeon_mn_invalidate_range_start,
174 * radeon_mn_get - create notifier context
176 * @rdev: radeon device pointer
178 * Creates a notifier context for current->mm.
180 static struct radeon_mn *radeon_mn_get(struct radeon_device *rdev)
182 struct mm_struct *mm = current->mm;
183 struct radeon_mn *rmn;
186 down_write(&mm->mmap_sem);
187 mutex_lock(&rdev->mn_lock);
189 hash_for_each_possible(rdev->mn_hash, rmn, node, (unsigned long)mm)
193 rmn = kzalloc(sizeof(*rmn), GFP_KERNEL);
195 rmn = ERR_PTR(-ENOMEM);
201 rmn->mn.ops = &radeon_mn_ops;
202 mutex_init(&rmn->lock);
203 rmn->objects = RB_ROOT;
205 r = __mmu_notifier_register(&rmn->mn, mm);
209 hash_add(rdev->mn_hash, &rmn->node, (unsigned long)mm);
212 mutex_unlock(&rdev->mn_lock);
213 up_write(&mm->mmap_sem);
218 mutex_unlock(&rdev->mn_lock);
219 up_write(&mm->mmap_sem);
226 * radeon_mn_register - register a BO for notifier updates
228 * @bo: radeon buffer object
229 * @addr: userptr addr we should monitor
231 * Registers an MMU notifier for the given BO at the specified address.
232 * Returns 0 on success, -ERRNO if anything goes wrong.
234 int radeon_mn_register(struct radeon_bo *bo, unsigned long addr)
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;
243 rmn = radeon_mn_get(rdev);
247 INIT_LIST_HEAD(&bos);
249 mutex_lock(&rmn->lock);
251 while ((it = interval_tree_iter_first(&rmn->objects, addr, end))) {
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);
261 node = kmalloc(sizeof(struct radeon_mn_node), GFP_KERNEL);
263 mutex_unlock(&rmn->lock);
270 node->it.start = addr;
272 INIT_LIST_HEAD(&node->bos);
273 list_splice(&bos, &node->bos);
274 list_add(&bo->mn_list, &node->bos);
276 interval_tree_insert(&node->it, &rmn->objects);
278 mutex_unlock(&rmn->lock);
284 * radeon_mn_unregister - unregister a BO for notifier updates
286 * @bo: radeon buffer object
288 * Remove any registration of MMU notifier updates from the buffer object.
290 void radeon_mn_unregister(struct radeon_bo *bo)
292 struct radeon_device *rdev = bo->rdev;
293 struct radeon_mn *rmn;
294 struct list_head *head;
296 mutex_lock(&rdev->mn_lock);
299 mutex_unlock(&rdev->mn_lock);
303 mutex_lock(&rmn->lock);
304 /* save the next list entry for later */
305 head = bo->mn_list.next;
308 list_del(&bo->mn_list);
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);
317 mutex_unlock(&rmn->lock);
318 mutex_unlock(&rdev->mn_lock);