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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
39struct radeon_mn {
40
41 struct radeon_device *rdev;
42 struct mm_struct *mm;
43 struct mmu_notifier mn;
44
45
46 struct work_struct work;
47
48
49 struct hlist_node node;
50
51
52 struct mutex lock;
53 struct rb_root_cached objects;
54};
55
56struct radeon_mn_node {
57 struct interval_tree_node it;
58 struct list_head bos;
59};
60
61
62
63
64
65
66
67
68static void radeon_mn_destroy(struct work_struct *work)
69{
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;
74
75 mutex_lock(&rdev->mn_lock);
76 mutex_lock(&rmn->lock);
77 hash_del(&rmn->node);
78 rbtree_postorder_for_each_entry_safe(node, next_node,
79 &rmn->objects.rb_root, it.rb) {
80
81 interval_tree_remove(&node->it, &rmn->objects);
82 list_for_each_entry_safe(bo, next_bo, &node->bos, mn_list) {
83 bo->mn = NULL;
84 list_del_init(&bo->mn_list);
85 }
86 kfree(node);
87 }
88 mutex_unlock(&rmn->lock);
89 mutex_unlock(&rdev->mn_lock);
90 mmu_notifier_unregister(&rmn->mn, rmn->mm);
91 kfree(rmn);
92}
93
94
95
96
97
98
99
100
101
102static void radeon_mn_release(struct mmu_notifier *mn,
103 struct mm_struct *mm)
104{
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);
108}
109
110
111
112
113
114
115
116
117
118
119
120
121static int radeon_mn_invalidate_range_start(struct mmu_notifier *mn,
122 struct mm_struct *mm,
123 unsigned long start,
124 unsigned long end,
125 bool blockable)
126{
127 struct radeon_mn *rmn = container_of(mn, struct radeon_mn, mn);
128 struct ttm_operation_ctx ctx = { false, false };
129 struct interval_tree_node *it;
130 int ret = 0;
131
132
133 end -= 1;
134
135
136
137
138 if (blockable)
139 mutex_lock(&rmn->lock);
140 else if (!mutex_trylock(&rmn->lock))
141 return -EAGAIN;
142
143 it = interval_tree_iter_first(&rmn->objects, start, end);
144 while (it) {
145 struct radeon_mn_node *node;
146 struct radeon_bo *bo;
147 long r;
148
149 if (!blockable) {
150 ret = -EAGAIN;
151 goto out_unlock;
152 }
153
154 node = container_of(it, struct radeon_mn_node, it);
155 it = interval_tree_iter_next(it, start, end);
156
157 list_for_each_entry(bo, &node->bos, mn_list) {
158
159 if (!bo->tbo.ttm || bo->tbo.ttm->state != tt_bound)
160 continue;
161
162 r = radeon_bo_reserve(bo, true);
163 if (r) {
164 DRM_ERROR("(%ld) failed to reserve user bo\n", r);
165 continue;
166 }
167
168 r = reservation_object_wait_timeout_rcu(bo->tbo.resv,
169 true, false, MAX_SCHEDULE_TIMEOUT);
170 if (r <= 0)
171 DRM_ERROR("(%ld) failed to wait for user bo\n", r);
172
173 radeon_ttm_placement_from_domain(bo, RADEON_GEM_DOMAIN_CPU);
174 r = ttm_bo_validate(&bo->tbo, &bo->placement, &ctx);
175 if (r)
176 DRM_ERROR("(%ld) failed to validate user bo\n", r);
177
178 radeon_bo_unreserve(bo);
179 }
180 }
181
182out_unlock:
183 mutex_unlock(&rmn->lock);
184
185 return ret;
186}
187
188static const struct mmu_notifier_ops radeon_mn_ops = {
189 .release = radeon_mn_release,
190 .invalidate_range_start = radeon_mn_invalidate_range_start,
191};
192
193
194
195
196
197
198
199
200static struct radeon_mn *radeon_mn_get(struct radeon_device *rdev)
201{
202 struct mm_struct *mm = current->mm;
203 struct radeon_mn *rmn;
204 int r;
205
206 if (down_write_killable(&mm->mmap_sem))
207 return ERR_PTR(-EINTR);
208
209 mutex_lock(&rdev->mn_lock);
210
211 hash_for_each_possible(rdev->mn_hash, rmn, node, (unsigned long)mm)
212 if (rmn->mm == mm)
213 goto release_locks;
214
215 rmn = kzalloc(sizeof(*rmn), GFP_KERNEL);
216 if (!rmn) {
217 rmn = ERR_PTR(-ENOMEM);
218 goto release_locks;
219 }
220
221 rmn->rdev = rdev;
222 rmn->mm = mm;
223 rmn->mn.ops = &radeon_mn_ops;
224 mutex_init(&rmn->lock);
225 rmn->objects = RB_ROOT_CACHED;
226
227 r = __mmu_notifier_register(&rmn->mn, mm);
228 if (r)
229 goto free_rmn;
230
231 hash_add(rdev->mn_hash, &rmn->node, (unsigned long)mm);
232
233release_locks:
234 mutex_unlock(&rdev->mn_lock);
235 up_write(&mm->mmap_sem);
236
237 return rmn;
238
239free_rmn:
240 mutex_unlock(&rdev->mn_lock);
241 up_write(&mm->mmap_sem);
242 kfree(rmn);
243
244 return ERR_PTR(r);
245}
246
247
248
249
250
251
252
253
254
255
256int radeon_mn_register(struct radeon_bo *bo, unsigned long addr)
257{
258 unsigned long end = addr + radeon_bo_size(bo) - 1;
259 struct radeon_device *rdev = bo->rdev;
260 struct radeon_mn *rmn;
261 struct radeon_mn_node *node = NULL;
262 struct list_head bos;
263 struct interval_tree_node *it;
264
265 rmn = radeon_mn_get(rdev);
266 if (IS_ERR(rmn))
267 return PTR_ERR(rmn);
268
269 INIT_LIST_HEAD(&bos);
270
271 mutex_lock(&rmn->lock);
272
273 while ((it = interval_tree_iter_first(&rmn->objects, addr, end))) {
274 kfree(node);
275 node = container_of(it, struct radeon_mn_node, it);
276 interval_tree_remove(&node->it, &rmn->objects);
277 addr = min(it->start, addr);
278 end = max(it->last, end);
279 list_splice(&node->bos, &bos);
280 }
281
282 if (!node) {
283 node = kmalloc(sizeof(struct radeon_mn_node), GFP_KERNEL);
284 if (!node) {
285 mutex_unlock(&rmn->lock);
286 return -ENOMEM;
287 }
288 }
289
290 bo->mn = rmn;
291
292 node->it.start = addr;
293 node->it.last = end;
294 INIT_LIST_HEAD(&node->bos);
295 list_splice(&bos, &node->bos);
296 list_add(&bo->mn_list, &node->bos);
297
298 interval_tree_insert(&node->it, &rmn->objects);
299
300 mutex_unlock(&rmn->lock);
301
302 return 0;
303}
304
305
306
307
308
309
310
311
312void radeon_mn_unregister(struct radeon_bo *bo)
313{
314 struct radeon_device *rdev = bo->rdev;
315 struct radeon_mn *rmn;
316 struct list_head *head;
317
318 mutex_lock(&rdev->mn_lock);
319 rmn = bo->mn;
320 if (rmn == NULL) {
321 mutex_unlock(&rdev->mn_lock);
322 return;
323 }
324
325 mutex_lock(&rmn->lock);
326
327 head = bo->mn_list.next;
328
329 bo->mn = NULL;
330 list_del(&bo->mn_list);
331
332 if (list_empty(head)) {
333 struct radeon_mn_node *node;
334 node = container_of(head, struct radeon_mn_node, bos);
335 interval_tree_remove(&node->it, &rmn->objects);
336 kfree(node);
337 }
338
339 mutex_unlock(&rmn->lock);
340 mutex_unlock(&rdev->mn_lock);
341}
342