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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 <linux/interval_tree.h>
35#include <drm/drmP.h>
36#include <drm/drm.h>
37
38#include "amdgpu.h"
39
40struct amdgpu_mn {
41 /* constant after initialisation */
42 struct amdgpu_device *adev;
43 struct mm_struct *mm;
44 struct mmu_notifier mn;
45
46 /* only used on destruction */
47 struct work_struct work;
48
49 /* protected by adev->mn_lock */
50 struct hlist_node node;
51
52 /* objects protected by lock */
53 struct rw_semaphore lock;
54 struct rb_root_cached objects;
55 struct mutex read_lock;
56 atomic_t recursion;
57};
58
59struct amdgpu_mn_node {
60 struct interval_tree_node it;
61 struct list_head bos;
62};
63
64/**
65 * amdgpu_mn_destroy - destroy the rmn
66 *
67 * @work: previously sheduled work item
68 *
69 * Lazy destroys the notifier from a work item
70 */
71static void amdgpu_mn_destroy(struct work_struct *work)
72{
73 struct amdgpu_mn *rmn = container_of(work, struct amdgpu_mn, work);
74 struct amdgpu_device *adev = rmn->adev;
75 struct amdgpu_mn_node *node, *next_node;
76 struct amdgpu_bo *bo, *next_bo;
77
78 mutex_lock(&adev->mn_lock);
79 down_write(&rmn->lock);
80 hash_del(&rmn->node);
81 rbtree_postorder_for_each_entry_safe(node, next_node,
82 &rmn->objects.rb_root, it.rb) {
83 list_for_each_entry_safe(bo, next_bo, &node->bos, mn_list) {
84 bo->mn = NULL;
85 list_del_init(&bo->mn_list);
86 }
87 kfree(node);
88 }
89 up_write(&rmn->lock);
90 mutex_unlock(&adev->mn_lock);
91 mmu_notifier_unregister_no_release(&rmn->mn, rmn->mm);
92 kfree(rmn);
93}
94
95/**
96 * amdgpu_mn_release - callback to notify about mm destruction
97 *
98 * @mn: our notifier
99 * @mn: the mm this callback is about
100 *
101 * Shedule a work item to lazy destroy our notifier.
102 */
103static void amdgpu_mn_release(struct mmu_notifier *mn,
104 struct mm_struct *mm)
105{
106 struct amdgpu_mn *rmn = container_of(mn, struct amdgpu_mn, mn);
107 INIT_WORK(&rmn->work, amdgpu_mn_destroy);
108 schedule_work(&rmn->work);
109}
110
111
112/**
113 * amdgpu_mn_lock - take the write side lock for this mn
114 */
115void amdgpu_mn_lock(struct amdgpu_mn *mn)
116{
117 if (mn)
118 down_write(&mn->lock);
119}
120
121/**
122 * amdgpu_mn_unlock - drop the write side lock for this mn
123 */
124void amdgpu_mn_unlock(struct amdgpu_mn *mn)
125{
126 if (mn)
127 up_write(&mn->lock);
128}
129
130/**
131 * amdgpu_mn_read_lock - take the rmn read lock
132 *
133 * @rmn: our notifier
134 *
135 * Take the rmn read side lock.
136 */
137static void amdgpu_mn_read_lock(struct amdgpu_mn *rmn)
138{
139 mutex_lock(&rmn->read_lock);
140 if (atomic_inc_return(&rmn->recursion) == 1)
141 down_read_non_owner(&rmn->lock);
142 mutex_unlock(&rmn->read_lock);
143}
144
145/**
146 * amdgpu_mn_read_unlock - drop the rmn read lock
147 *
148 * @rmn: our notifier
149 *
150 * Drop the rmn read side lock.
151 */
152static void amdgpu_mn_read_unlock(struct amdgpu_mn *rmn)
153{
154 if (atomic_dec_return(&rmn->recursion) == 0)
155 up_read_non_owner(&rmn->lock);
156}
157
158/**
159 * amdgpu_mn_invalidate_node - unmap all BOs of a node
160 *
161 * @node: the node with the BOs to unmap
162 *
163 * We block for all BOs and unmap them by move them
164 * into system domain again.
165 */
166static void amdgpu_mn_invalidate_node(struct amdgpu_mn_node *node,
167 unsigned long start,
168 unsigned long end)
169{
170 struct amdgpu_bo *bo;
171 long r;
172
173 list_for_each_entry(bo, &node->bos, mn_list) {
174
175 if (!amdgpu_ttm_tt_affect_userptr(bo->tbo.ttm, start, end))
176 continue;
177
178 r = reservation_object_wait_timeout_rcu(bo->tbo.resv,
179 true, false, MAX_SCHEDULE_TIMEOUT);
180 if (r <= 0)
181 DRM_ERROR("(%ld) failed to wait for user bo\n", r);
182
183 amdgpu_ttm_tt_mark_user_pages(bo->tbo.ttm);
184 }
185}
186
187/**
188 * amdgpu_mn_invalidate_range_start - callback to notify about mm change
189 *
190 * @mn: our notifier
191 * @mn: the mm this callback is about
192 * @start: start of updated range
193 * @end: end of updated range
194 *
195 * We block for all BOs between start and end to be idle and
196 * unmap them by move them into system domain again.
197 */
198static void amdgpu_mn_invalidate_range_start(struct mmu_notifier *mn,
199 struct mm_struct *mm,
200 unsigned long start,
201 unsigned long end)
202{
203 struct amdgpu_mn *rmn = container_of(mn, struct amdgpu_mn, mn);
204 struct interval_tree_node *it;
205
206 /* notification is exclusive, but interval is inclusive */
207 end -= 1;
208
209 amdgpu_mn_read_lock(rmn);
210
211 it = interval_tree_iter_first(&rmn->objects, start, end);
212 while (it) {
213 struct amdgpu_mn_node *node;
214
215 node = container_of(it, struct amdgpu_mn_node, it);
216 it = interval_tree_iter_next(it, start, end);
217
218 amdgpu_mn_invalidate_node(node, start, end);
219 }
220}
221
222/**
223 * amdgpu_mn_invalidate_range_end - callback to notify about mm change
224 *
225 * @mn: our notifier
226 * @mn: the mm this callback is about
227 * @start: start of updated range
228 * @end: end of updated range
229 *
230 * Release the lock again to allow new command submissions.
231 */
232static void amdgpu_mn_invalidate_range_end(struct mmu_notifier *mn,
233 struct mm_struct *mm,
234 unsigned long start,
235 unsigned long end)
236{
237 struct amdgpu_mn *rmn = container_of(mn, struct amdgpu_mn, mn);
238
239 amdgpu_mn_read_unlock(rmn);
240}
241
242static const struct mmu_notifier_ops amdgpu_mn_ops = {
243 .release = amdgpu_mn_release,
244 .invalidate_range_start = amdgpu_mn_invalidate_range_start,
245 .invalidate_range_end = amdgpu_mn_invalidate_range_end,
246};
247
248/**
249 * amdgpu_mn_get - create notifier context
250 *
251 * @adev: amdgpu device pointer
252 *
253 * Creates a notifier context for current->mm.
254 */
255struct amdgpu_mn *amdgpu_mn_get(struct amdgpu_device *adev)
256{
257 struct mm_struct *mm = current->mm;
258 struct amdgpu_mn *rmn;
259 int r;
260
261 mutex_lock(&adev->mn_lock);
262 if (down_write_killable(&mm->mmap_sem)) {
263 mutex_unlock(&adev->mn_lock);
264 return ERR_PTR(-EINTR);
265 }
266
267 hash_for_each_possible(adev->mn_hash, rmn, node, (unsigned long)mm)
268 if (rmn->mm == mm)
269 goto release_locks;
270
271 rmn = kzalloc(sizeof(*rmn), GFP_KERNEL);
272 if (!rmn) {
273 rmn = ERR_PTR(-ENOMEM);
274 goto release_locks;
275 }
276
277 rmn->adev = adev;
278 rmn->mm = mm;
279 rmn->mn.ops = &amdgpu_mn_ops;
280 init_rwsem(&rmn->lock);
281 rmn->objects = RB_ROOT_CACHED;
282 mutex_init(&rmn->read_lock);
283 atomic_set(&rmn->recursion, 0);
284
285 r = __mmu_notifier_register(&rmn->mn, mm);
286 if (r)
287 goto free_rmn;
288
289 hash_add(adev->mn_hash, &rmn->node, (unsigned long)mm);
290
291release_locks:
292 up_write(&mm->mmap_sem);
293 mutex_unlock(&adev->mn_lock);
294
295 return rmn;
296
297free_rmn:
298 up_write(&mm->mmap_sem);
299 mutex_unlock(&adev->mn_lock);
300 kfree(rmn);
301
302 return ERR_PTR(r);
303}
304
305/**
306 * amdgpu_mn_register - register a BO for notifier updates
307 *
308 * @bo: amdgpu buffer object
309 * @addr: userptr addr we should monitor
310 *
311 * Registers an MMU notifier for the given BO at the specified address.
312 * Returns 0 on success, -ERRNO if anything goes wrong.
313 */
314int amdgpu_mn_register(struct amdgpu_bo *bo, unsigned long addr)
315{
316 unsigned long end = addr + amdgpu_bo_size(bo) - 1;
317 struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
318 struct amdgpu_mn *rmn;
319 struct amdgpu_mn_node *node = NULL;
320 struct list_head bos;
321 struct interval_tree_node *it;
322
323 rmn = amdgpu_mn_get(adev);
324 if (IS_ERR(rmn))
325 return PTR_ERR(rmn);
326
327 INIT_LIST_HEAD(&bos);
328
329 down_write(&rmn->lock);
330
331 while ((it = interval_tree_iter_first(&rmn->objects, addr, end))) {
332 kfree(node);
333 node = container_of(it, struct amdgpu_mn_node, it);
334 interval_tree_remove(&node->it, &rmn->objects);
335 addr = min(it->start, addr);
336 end = max(it->last, end);
337 list_splice(&node->bos, &bos);
338 }
339
340 if (!node) {
341 node = kmalloc(sizeof(struct amdgpu_mn_node), GFP_KERNEL);
342 if (!node) {
343 up_write(&rmn->lock);
344 return -ENOMEM;
345 }
346 }
347
348 bo->mn = rmn;
349
350 node->it.start = addr;
351 node->it.last = end;
352 INIT_LIST_HEAD(&node->bos);
353 list_splice(&bos, &node->bos);
354 list_add(&bo->mn_list, &node->bos);
355
356 interval_tree_insert(&node->it, &rmn->objects);
357
358 up_write(&rmn->lock);
359
360 return 0;
361}
362
363/**
364 * amdgpu_mn_unregister - unregister a BO for notifier updates
365 *
366 * @bo: amdgpu buffer object
367 *
368 * Remove any registration of MMU notifier updates from the buffer object.
369 */
370void amdgpu_mn_unregister(struct amdgpu_bo *bo)
371{
372 struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
373 struct amdgpu_mn *rmn;
374 struct list_head *head;
375
376 mutex_lock(&adev->mn_lock);
377
378 rmn = bo->mn;
379 if (rmn == NULL) {
380 mutex_unlock(&adev->mn_lock);
381 return;
382 }
383
384 down_write(&rmn->lock);
385
386 /* save the next list entry for later */
387 head = bo->mn_list.next;
388
389 bo->mn = NULL;
390 list_del_init(&bo->mn_list);
391
392 if (list_empty(head)) {
393 struct amdgpu_mn_node *node;
394 node = container_of(head, struct amdgpu_mn_node, bos);
395 interval_tree_remove(&node->it, &rmn->objects);
396 kfree(node);
397 }
398
399 up_write(&rmn->lock);
400 mutex_unlock(&adev->mn_lock);
401}
402