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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright © 2015 Broadcom
4 */
5
6/**
7 * DOC: VC4 GEM BO management support
8 *
9 * The VC4 GPU architecture (both scanout and rendering) has direct
10 * access to system memory with no MMU in between. To support it, we
11 * use the GEM CMA helper functions to allocate contiguous ranges of
12 * physical memory for our BOs.
13 *
14 * Since the CMA allocator is very slow, we keep a cache of recently
15 * freed BOs around so that the kernel's allocation of objects for 3D
16 * rendering can return quickly.
17 */
18
19#include <linux/dma-buf.h>
20
21#include "vc4_drv.h"
22#include "uapi/drm/vc4_drm.h"
23
24static const char * const bo_type_names[] = {
25 "kernel",
26 "V3D",
27 "V3D shader",
28 "dumb",
29 "binner",
30 "RCL",
31 "BCL",
32 "kernel BO cache",
33};
34
35static bool is_user_label(int label)
36{
37 return label >= VC4_BO_TYPE_COUNT;
38}
39
40static void vc4_bo_stats_print(struct drm_printer *p, struct vc4_dev *vc4)
41{
42 int i;
43
44 for (i = 0; i < vc4->num_labels; i++) {
45 if (!vc4->bo_labels[i].num_allocated)
46 continue;
47
48 drm_printf(p, "%30s: %6dkb BOs (%d)\n",
49 vc4->bo_labels[i].name,
50 vc4->bo_labels[i].size_allocated / 1024,
51 vc4->bo_labels[i].num_allocated);
52 }
53
54 mutex_lock(&vc4->purgeable.lock);
55 if (vc4->purgeable.num)
56 drm_printf(p, "%30s: %6zdkb BOs (%d)\n", "userspace BO cache",
57 vc4->purgeable.size / 1024, vc4->purgeable.num);
58
59 if (vc4->purgeable.purged_num)
60 drm_printf(p, "%30s: %6zdkb BOs (%d)\n", "total purged BO",
61 vc4->purgeable.purged_size / 1024,
62 vc4->purgeable.purged_num);
63 mutex_unlock(&vc4->purgeable.lock);
64}
65
66static int vc4_bo_stats_debugfs(struct seq_file *m, void *unused)
67{
68 struct drm_info_node *node = (struct drm_info_node *)m->private;
69 struct drm_device *dev = node->minor->dev;
70 struct vc4_dev *vc4 = to_vc4_dev(dev);
71 struct drm_printer p = drm_seq_file_printer(m);
72
73 vc4_bo_stats_print(&p, vc4);
74
75 return 0;
76}
77
78/* Takes ownership of *name and returns the appropriate slot for it in
79 * the bo_labels[] array, extending it as necessary.
80 *
81 * This is inefficient and could use a hash table instead of walking
82 * an array and strcmp()ing. However, the assumption is that user
83 * labeling will be infrequent (scanout buffers and other long-lived
84 * objects, or debug driver builds), so we can live with it for now.
85 */
86static int vc4_get_user_label(struct vc4_dev *vc4, const char *name)
87{
88 int i;
89 int free_slot = -1;
90
91 for (i = 0; i < vc4->num_labels; i++) {
92 if (!vc4->bo_labels[i].name) {
93 free_slot = i;
94 } else if (strcmp(vc4->bo_labels[i].name, name) == 0) {
95 kfree(name);
96 return i;
97 }
98 }
99
100 if (free_slot != -1) {
101 WARN_ON(vc4->bo_labels[free_slot].num_allocated != 0);
102 vc4->bo_labels[free_slot].name = name;
103 return free_slot;
104 } else {
105 u32 new_label_count = vc4->num_labels + 1;
106 struct vc4_label *new_labels =
107 krealloc(vc4->bo_labels,
108 new_label_count * sizeof(*new_labels),
109 GFP_KERNEL);
110
111 if (!new_labels) {
112 kfree(name);
113 return -1;
114 }
115
116 free_slot = vc4->num_labels;
117 vc4->bo_labels = new_labels;
118 vc4->num_labels = new_label_count;
119
120 vc4->bo_labels[free_slot].name = name;
121 vc4->bo_labels[free_slot].num_allocated = 0;
122 vc4->bo_labels[free_slot].size_allocated = 0;
123
124 return free_slot;
125 }
126}
127
128static void vc4_bo_set_label(struct drm_gem_object *gem_obj, int label)
129{
130 struct vc4_bo *bo = to_vc4_bo(gem_obj);
131 struct vc4_dev *vc4 = to_vc4_dev(gem_obj->dev);
132
133 lockdep_assert_held(&vc4->bo_lock);
134
135 if (label != -1) {
136 vc4->bo_labels[label].num_allocated++;
137 vc4->bo_labels[label].size_allocated += gem_obj->size;
138 }
139
140 vc4->bo_labels[bo->label].num_allocated--;
141 vc4->bo_labels[bo->label].size_allocated -= gem_obj->size;
142
143 if (vc4->bo_labels[bo->label].num_allocated == 0 &&
144 is_user_label(bo->label)) {
145 /* Free user BO label slots on last unreference.
146 * Slots are just where we track the stats for a given
147 * name, and once a name is unused we can reuse that
148 * slot.
149 */
150 kfree(vc4->bo_labels[bo->label].name);
151 vc4->bo_labels[bo->label].name = NULL;
152 }
153
154 bo->label = label;
155}
156
157static uint32_t bo_page_index(size_t size)
158{
159 return (size / PAGE_SIZE) - 1;
160}
161
162static void vc4_bo_destroy(struct vc4_bo *bo)
163{
164 struct drm_gem_object *obj = &bo->base.base;
165 struct vc4_dev *vc4 = to_vc4_dev(obj->dev);
166
167 lockdep_assert_held(&vc4->bo_lock);
168
169 vc4_bo_set_label(obj, -1);
170
171 if (bo->validated_shader) {
172 kfree(bo->validated_shader->uniform_addr_offsets);
173 kfree(bo->validated_shader->texture_samples);
174 kfree(bo->validated_shader);
175 bo->validated_shader = NULL;
176 }
177
178 drm_gem_cma_free_object(obj);
179}
180
181static void vc4_bo_remove_from_cache(struct vc4_bo *bo)
182{
183 struct vc4_dev *vc4 = to_vc4_dev(bo->base.base.dev);
184
185 lockdep_assert_held(&vc4->bo_lock);
186 list_del(&bo->unref_head);
187 list_del(&bo->size_head);
188}
189
190static struct list_head *vc4_get_cache_list_for_size(struct drm_device *dev,
191 size_t size)
192{
193 struct vc4_dev *vc4 = to_vc4_dev(dev);
194 uint32_t page_index = bo_page_index(size);
195
196 if (vc4->bo_cache.size_list_size <= page_index) {
197 uint32_t new_size = max(vc4->bo_cache.size_list_size * 2,
198 page_index + 1);
199 struct list_head *new_list;
200 uint32_t i;
201
202 new_list = kmalloc_array(new_size, sizeof(struct list_head),
203 GFP_KERNEL);
204 if (!new_list)
205 return NULL;
206
207 /* Rebase the old cached BO lists to their new list
208 * head locations.
209 */
210 for (i = 0; i < vc4->bo_cache.size_list_size; i++) {
211 struct list_head *old_list =
212 &vc4->bo_cache.size_list[i];
213
214 if (list_empty(old_list))
215 INIT_LIST_HEAD(&new_list[i]);
216 else
217 list_replace(old_list, &new_list[i]);
218 }
219 /* And initialize the brand new BO list heads. */
220 for (i = vc4->bo_cache.size_list_size; i < new_size; i++)
221 INIT_LIST_HEAD(&new_list[i]);
222
223 kfree(vc4->bo_cache.size_list);
224 vc4->bo_cache.size_list = new_list;
225 vc4->bo_cache.size_list_size = new_size;
226 }
227
228 return &vc4->bo_cache.size_list[page_index];
229}
230
231static void vc4_bo_cache_purge(struct drm_device *dev)
232{
233 struct vc4_dev *vc4 = to_vc4_dev(dev);
234
235 mutex_lock(&vc4->bo_lock);
236 while (!list_empty(&vc4->bo_cache.time_list)) {
237 struct vc4_bo *bo = list_last_entry(&vc4->bo_cache.time_list,
238 struct vc4_bo, unref_head);
239 vc4_bo_remove_from_cache(bo);
240 vc4_bo_destroy(bo);
241 }
242 mutex_unlock(&vc4->bo_lock);
243}
244
245void vc4_bo_add_to_purgeable_pool(struct vc4_bo *bo)
246{
247 struct vc4_dev *vc4 = to_vc4_dev(bo->base.base.dev);
248
249 mutex_lock(&vc4->purgeable.lock);
250 list_add_tail(&bo->size_head, &vc4->purgeable.list);
251 vc4->purgeable.num++;
252 vc4->purgeable.size += bo->base.base.size;
253 mutex_unlock(&vc4->purgeable.lock);
254}
255
256static void vc4_bo_remove_from_purgeable_pool_locked(struct vc4_bo *bo)
257{
258 struct vc4_dev *vc4 = to_vc4_dev(bo->base.base.dev);
259
260 /* list_del_init() is used here because the caller might release
261 * the purgeable lock in order to acquire the madv one and update the
262 * madv status.
263 * During this short period of time a user might decide to mark
264 * the BO as unpurgeable, and if bo->madv is set to
265 * VC4_MADV_DONTNEED it will try to remove the BO from the
266 * purgeable list which will fail if the ->next/prev fields
267 * are set to LIST_POISON1/LIST_POISON2 (which is what
268 * list_del() does).
269 * Re-initializing the list element guarantees that list_del()
270 * will work correctly even if it's a NOP.
271 */
272 list_del_init(&bo->size_head);
273 vc4->purgeable.num--;
274 vc4->purgeable.size -= bo->base.base.size;
275}
276
277void vc4_bo_remove_from_purgeable_pool(struct vc4_bo *bo)
278{
279 struct vc4_dev *vc4 = to_vc4_dev(bo->base.base.dev);
280
281 mutex_lock(&vc4->purgeable.lock);
282 vc4_bo_remove_from_purgeable_pool_locked(bo);
283 mutex_unlock(&vc4->purgeable.lock);
284}
285
286static void vc4_bo_purge(struct drm_gem_object *obj)
287{
288 struct vc4_bo *bo = to_vc4_bo(obj);
289 struct drm_device *dev = obj->dev;
290
291 WARN_ON(!mutex_is_locked(&bo->madv_lock));
292 WARN_ON(bo->madv != VC4_MADV_DONTNEED);
293
294 drm_vma_node_unmap(&obj->vma_node, dev->anon_inode->i_mapping);
295
296 dma_free_wc(dev->dev, obj->size, bo->base.vaddr, bo->base.paddr);
297 bo->base.vaddr = NULL;
298 bo->madv = __VC4_MADV_PURGED;
299}
300
301static void vc4_bo_userspace_cache_purge(struct drm_device *dev)
302{
303 struct vc4_dev *vc4 = to_vc4_dev(dev);
304
305 mutex_lock(&vc4->purgeable.lock);
306 while (!list_empty(&vc4->purgeable.list)) {
307 struct vc4_bo *bo = list_first_entry(&vc4->purgeable.list,
308 struct vc4_bo, size_head);
309 struct drm_gem_object *obj = &bo->base.base;
310 size_t purged_size = 0;
311
312 vc4_bo_remove_from_purgeable_pool_locked(bo);
313
314 /* Release the purgeable lock while we're purging the BO so
315 * that other people can continue inserting things in the
316 * purgeable pool without having to wait for all BOs to be
317 * purged.
318 */
319 mutex_unlock(&vc4->purgeable.lock);
320 mutex_lock(&bo->madv_lock);
321
322 /* Since we released the purgeable pool lock before acquiring
323 * the BO madv one, the user may have marked the BO as WILLNEED
324 * and re-used it in the meantime.
325 * Before purging the BO we need to make sure
326 * - it is still marked as DONTNEED
327 * - it has not been re-inserted in the purgeable list
328 * - it is not used by HW blocks
329 * If one of these conditions is not met, just skip the entry.
330 */
331 if (bo->madv == VC4_MADV_DONTNEED &&
332 list_empty(&bo->size_head) &&
333 !refcount_read(&bo->usecnt)) {
334 purged_size = bo->base.base.size;
335 vc4_bo_purge(obj);
336 }
337 mutex_unlock(&bo->madv_lock);
338 mutex_lock(&vc4->purgeable.lock);
339
340 if (purged_size) {
341 vc4->purgeable.purged_size += purged_size;
342 vc4->purgeable.purged_num++;
343 }
344 }
345 mutex_unlock(&vc4->purgeable.lock);
346}
347
348static struct vc4_bo *vc4_bo_get_from_cache(struct drm_device *dev,
349 uint32_t size,
350 enum vc4_kernel_bo_type type)
351{
352 struct vc4_dev *vc4 = to_vc4_dev(dev);
353 uint32_t page_index = bo_page_index(size);
354 struct vc4_bo *bo = NULL;
355
356 size = roundup(size, PAGE_SIZE);
357
358 mutex_lock(&vc4->bo_lock);
359 if (page_index >= vc4->bo_cache.size_list_size)
360 goto out;
361
362 if (list_empty(&vc4->bo_cache.size_list[page_index]))
363 goto out;
364
365 bo = list_first_entry(&vc4->bo_cache.size_list[page_index],
366 struct vc4_bo, size_head);
367 vc4_bo_remove_from_cache(bo);
368 kref_init(&bo->base.base.refcount);
369
370out:
371 if (bo)
372 vc4_bo_set_label(&bo->base.base, type);
373 mutex_unlock(&vc4->bo_lock);
374 return bo;
375}
376
377/**
378 * vc4_gem_create_object - Implementation of driver->gem_create_object.
379 * @dev: DRM device
380 * @size: Size in bytes of the memory the object will reference
381 *
382 * This lets the CMA helpers allocate object structs for us, and keep
383 * our BO stats correct.
384 */
385struct drm_gem_object *vc4_create_object(struct drm_device *dev, size_t size)
386{
387 struct vc4_dev *vc4 = to_vc4_dev(dev);
388 struct vc4_bo *bo;
389
390 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
391 if (!bo)
392 return ERR_PTR(-ENOMEM);
393
394 bo->madv = VC4_MADV_WILLNEED;
395 refcount_set(&bo->usecnt, 0);
396 mutex_init(&bo->madv_lock);
397 mutex_lock(&vc4->bo_lock);
398 bo->label = VC4_BO_TYPE_KERNEL;
399 vc4->bo_labels[VC4_BO_TYPE_KERNEL].num_allocated++;
400 vc4->bo_labels[VC4_BO_TYPE_KERNEL].size_allocated += size;
401 mutex_unlock(&vc4->bo_lock);
402
403 return &bo->base.base;
404}
405
406struct vc4_bo *vc4_bo_create(struct drm_device *dev, size_t unaligned_size,
407 bool allow_unzeroed, enum vc4_kernel_bo_type type)
408{
409 size_t size = roundup(unaligned_size, PAGE_SIZE);
410 struct vc4_dev *vc4 = to_vc4_dev(dev);
411 struct drm_gem_cma_object *cma_obj;
412 struct vc4_bo *bo;
413
414 if (size == 0)
415 return ERR_PTR(-EINVAL);
416
417 /* First, try to get a vc4_bo from the kernel BO cache. */
418 bo = vc4_bo_get_from_cache(dev, size, type);
419 if (bo) {
420 if (!allow_unzeroed)
421 memset(bo->base.vaddr, 0, bo->base.base.size);
422 return bo;
423 }
424
425 cma_obj = drm_gem_cma_create(dev, size);
426 if (IS_ERR(cma_obj)) {
427 /*
428 * If we've run out of CMA memory, kill the cache of
429 * CMA allocations we've got laying around and try again.
430 */
431 vc4_bo_cache_purge(dev);
432 cma_obj = drm_gem_cma_create(dev, size);
433 }
434
435 if (IS_ERR(cma_obj)) {
436 /*
437 * Still not enough CMA memory, purge the userspace BO
438 * cache and retry.
439 * This is sub-optimal since we purge the whole userspace
440 * BO cache which forces user that want to re-use the BO to
441 * restore its initial content.
442 * Ideally, we should purge entries one by one and retry
443 * after each to see if CMA allocation succeeds. Or even
444 * better, try to find an entry with at least the same
445 * size.
446 */
447 vc4_bo_userspace_cache_purge(dev);
448 cma_obj = drm_gem_cma_create(dev, size);
449 }
450
451 if (IS_ERR(cma_obj)) {
452 struct drm_printer p = drm_info_printer(vc4->dev->dev);
453 DRM_ERROR("Failed to allocate from CMA:\n");
454 vc4_bo_stats_print(&p, vc4);
455 return ERR_PTR(-ENOMEM);
456 }
457 bo = to_vc4_bo(&cma_obj->base);
458
459 /* By default, BOs do not support the MADV ioctl. This will be enabled
460 * only on BOs that are exposed to userspace (V3D, V3D_SHADER and DUMB
461 * BOs).
462 */
463 bo->madv = __VC4_MADV_NOTSUPP;
464
465 mutex_lock(&vc4->bo_lock);
466 vc4_bo_set_label(&cma_obj->base, type);
467 mutex_unlock(&vc4->bo_lock);
468
469 return bo;
470}
471
472int vc4_dumb_create(struct drm_file *file_priv,
473 struct drm_device *dev,
474 struct drm_mode_create_dumb *args)
475{
476 int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
477 struct vc4_bo *bo = NULL;
478 int ret;
479
480 if (args->pitch < min_pitch)
481 args->pitch = min_pitch;
482
483 if (args->size < args->pitch * args->height)
484 args->size = args->pitch * args->height;
485
486 bo = vc4_bo_create(dev, args->size, false, VC4_BO_TYPE_DUMB);
487 if (IS_ERR(bo))
488 return PTR_ERR(bo);
489
490 bo->madv = VC4_MADV_WILLNEED;
491
492 ret = drm_gem_handle_create(file_priv, &bo->base.base, &args->handle);
493 drm_gem_object_put_unlocked(&bo->base.base);
494
495 return ret;
496}
497
498static void vc4_bo_cache_free_old(struct drm_device *dev)
499{
500 struct vc4_dev *vc4 = to_vc4_dev(dev);
501 unsigned long expire_time = jiffies - msecs_to_jiffies(1000);
502
503 lockdep_assert_held(&vc4->bo_lock);
504
505 while (!list_empty(&vc4->bo_cache.time_list)) {
506 struct vc4_bo *bo = list_last_entry(&vc4->bo_cache.time_list,
507 struct vc4_bo, unref_head);
508 if (time_before(expire_time, bo->free_time)) {
509 mod_timer(&vc4->bo_cache.time_timer,
510 round_jiffies_up(jiffies +
511 msecs_to_jiffies(1000)));
512 return;
513 }
514
515 vc4_bo_remove_from_cache(bo);
516 vc4_bo_destroy(bo);
517 }
518}
519
520/* Called on the last userspace/kernel unreference of the BO. Returns
521 * it to the BO cache if possible, otherwise frees it.
522 */
523void vc4_free_object(struct drm_gem_object *gem_bo)
524{
525 struct drm_device *dev = gem_bo->dev;
526 struct vc4_dev *vc4 = to_vc4_dev(dev);
527 struct vc4_bo *bo = to_vc4_bo(gem_bo);
528 struct list_head *cache_list;
529
530 /* Remove the BO from the purgeable list. */
531 mutex_lock(&bo->madv_lock);
532 if (bo->madv == VC4_MADV_DONTNEED && !refcount_read(&bo->usecnt))
533 vc4_bo_remove_from_purgeable_pool(bo);
534 mutex_unlock(&bo->madv_lock);
535
536 mutex_lock(&vc4->bo_lock);
537 /* If the object references someone else's memory, we can't cache it.
538 */
539 if (gem_bo->import_attach) {
540 vc4_bo_destroy(bo);
541 goto out;
542 }
543
544 /* Don't cache if it was publicly named. */
545 if (gem_bo->name) {
546 vc4_bo_destroy(bo);
547 goto out;
548 }
549
550 /* If this object was partially constructed but CMA allocation
551 * had failed, just free it. Can also happen when the BO has been
552 * purged.
553 */
554 if (!bo->base.vaddr) {
555 vc4_bo_destroy(bo);
556 goto out;
557 }
558
559 cache_list = vc4_get_cache_list_for_size(dev, gem_bo->size);
560 if (!cache_list) {
561 vc4_bo_destroy(bo);
562 goto out;
563 }
564
565 if (bo->validated_shader) {
566 kfree(bo->validated_shader->uniform_addr_offsets);
567 kfree(bo->validated_shader->texture_samples);
568 kfree(bo->validated_shader);
569 bo->validated_shader = NULL;
570 }
571
572 /* Reset madv and usecnt before adding the BO to the cache. */
573 bo->madv = __VC4_MADV_NOTSUPP;
574 refcount_set(&bo->usecnt, 0);
575
576 bo->t_format = false;
577 bo->free_time = jiffies;
578 list_add(&bo->size_head, cache_list);
579 list_add(&bo->unref_head, &vc4->bo_cache.time_list);
580
581 vc4_bo_set_label(&bo->base.base, VC4_BO_TYPE_KERNEL_CACHE);
582
583 vc4_bo_cache_free_old(dev);
584
585out:
586 mutex_unlock(&vc4->bo_lock);
587}
588
589static void vc4_bo_cache_time_work(struct work_struct *work)
590{
591 struct vc4_dev *vc4 =
592 container_of(work, struct vc4_dev, bo_cache.time_work);
593 struct drm_device *dev = vc4->dev;
594
595 mutex_lock(&vc4->bo_lock);
596 vc4_bo_cache_free_old(dev);
597 mutex_unlock(&vc4->bo_lock);
598}
599
600int vc4_bo_inc_usecnt(struct vc4_bo *bo)
601{
602 int ret;
603
604 /* Fast path: if the BO is already retained by someone, no need to
605 * check the madv status.
606 */
607 if (refcount_inc_not_zero(&bo->usecnt))
608 return 0;
609
610 mutex_lock(&bo->madv_lock);
611 switch (bo->madv) {
612 case VC4_MADV_WILLNEED:
613 if (!refcount_inc_not_zero(&bo->usecnt))
614 refcount_set(&bo->usecnt, 1);
615 ret = 0;
616 break;
617 case VC4_MADV_DONTNEED:
618 /* We shouldn't use a BO marked as purgeable if at least
619 * someone else retained its content by incrementing usecnt.
620 * Luckily the BO hasn't been purged yet, but something wrong
621 * is happening here. Just throw an error instead of
622 * authorizing this use case.
623 */
624 case __VC4_MADV_PURGED:
625 /* We can't use a purged BO. */
626 default:
627 /* Invalid madv value. */
628 ret = -EINVAL;
629 break;
630 }
631 mutex_unlock(&bo->madv_lock);
632
633 return ret;
634}
635
636void vc4_bo_dec_usecnt(struct vc4_bo *bo)
637{
638 /* Fast path: if the BO is still retained by someone, no need to test
639 * the madv value.
640 */
641 if (refcount_dec_not_one(&bo->usecnt))
642 return;
643
644 mutex_lock(&bo->madv_lock);
645 if (refcount_dec_and_test(&bo->usecnt) &&
646 bo->madv == VC4_MADV_DONTNEED)
647 vc4_bo_add_to_purgeable_pool(bo);
648 mutex_unlock(&bo->madv_lock);
649}
650
651static void vc4_bo_cache_time_timer(struct timer_list *t)
652{
653 struct vc4_dev *vc4 = from_timer(vc4, t, bo_cache.time_timer);
654
655 schedule_work(&vc4->bo_cache.time_work);
656}
657
658struct dma_buf * vc4_prime_export(struct drm_gem_object *obj, int flags)
659{
660 struct vc4_bo *bo = to_vc4_bo(obj);
661 struct dma_buf *dmabuf;
662 int ret;
663
664 if (bo->validated_shader) {
665 DRM_DEBUG("Attempting to export shader BO\n");
666 return ERR_PTR(-EINVAL);
667 }
668
669 /* Note: as soon as the BO is exported it becomes unpurgeable, because
670 * noone ever decrements the usecnt even if the reference held by the
671 * exported BO is released. This shouldn't be a problem since we don't
672 * expect exported BOs to be marked as purgeable.
673 */
674 ret = vc4_bo_inc_usecnt(bo);
675 if (ret) {
676 DRM_ERROR("Failed to increment BO usecnt\n");
677 return ERR_PTR(ret);
678 }
679
680 dmabuf = drm_gem_prime_export(obj, flags);
681 if (IS_ERR(dmabuf))
682 vc4_bo_dec_usecnt(bo);
683
684 return dmabuf;
685}
686
687vm_fault_t vc4_fault(struct vm_fault *vmf)
688{
689 struct vm_area_struct *vma = vmf->vma;
690 struct drm_gem_object *obj = vma->vm_private_data;
691 struct vc4_bo *bo = to_vc4_bo(obj);
692
693 /* The only reason we would end up here is when user-space accesses
694 * BO's memory after it's been purged.
695 */
696 mutex_lock(&bo->madv_lock);
697 WARN_ON(bo->madv != __VC4_MADV_PURGED);
698 mutex_unlock(&bo->madv_lock);
699
700 return VM_FAULT_SIGBUS;
701}
702
703int vc4_mmap(struct file *filp, struct vm_area_struct *vma)
704{
705 struct drm_gem_object *gem_obj;
706 unsigned long vm_pgoff;
707 struct vc4_bo *bo;
708 int ret;
709
710 ret = drm_gem_mmap(filp, vma);
711 if (ret)
712 return ret;
713
714 gem_obj = vma->vm_private_data;
715 bo = to_vc4_bo(gem_obj);
716
717 if (bo->validated_shader && (vma->vm_flags & VM_WRITE)) {
718 DRM_DEBUG("mmaping of shader BOs for writing not allowed.\n");
719 return -EINVAL;
720 }
721
722 if (bo->madv != VC4_MADV_WILLNEED) {
723 DRM_DEBUG("mmaping of %s BO not allowed\n",
724 bo->madv == VC4_MADV_DONTNEED ?
725 "purgeable" : "purged");
726 return -EINVAL;
727 }
728
729 /*
730 * Clear the VM_PFNMAP flag that was set by drm_gem_mmap(), and set the
731 * vm_pgoff (used as a fake buffer offset by DRM) to 0 as we want to map
732 * the whole buffer.
733 */
734 vma->vm_flags &= ~VM_PFNMAP;
735
736 /* This ->vm_pgoff dance is needed to make all parties happy:
737 * - dma_mmap_wc() uses ->vm_pgoff as an offset within the allocated
738 * mem-region, hence the need to set it to zero (the value set by
739 * the DRM core is a virtual offset encoding the GEM object-id)
740 * - the mmap() core logic needs ->vm_pgoff to be restored to its
741 * initial value before returning from this function because it
742 * encodes the offset of this GEM in the dev->anon_inode pseudo-file
743 * and this information will be used when we invalidate userspace
744 * mappings with drm_vma_node_unmap() (called from vc4_gem_purge()).
745 */
746 vm_pgoff = vma->vm_pgoff;
747 vma->vm_pgoff = 0;
748 ret = dma_mmap_wc(bo->base.base.dev->dev, vma, bo->base.vaddr,
749 bo->base.paddr, vma->vm_end - vma->vm_start);
750 vma->vm_pgoff = vm_pgoff;
751
752 if (ret)
753 drm_gem_vm_close(vma);
754
755 return ret;
756}
757
758int vc4_prime_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma)
759{
760 struct vc4_bo *bo = to_vc4_bo(obj);
761
762 if (bo->validated_shader && (vma->vm_flags & VM_WRITE)) {
763 DRM_DEBUG("mmaping of shader BOs for writing not allowed.\n");
764 return -EINVAL;
765 }
766
767 return drm_gem_cma_prime_mmap(obj, vma);
768}
769
770void *vc4_prime_vmap(struct drm_gem_object *obj)
771{
772 struct vc4_bo *bo = to_vc4_bo(obj);
773
774 if (bo->validated_shader) {
775 DRM_DEBUG("mmaping of shader BOs not allowed.\n");
776 return ERR_PTR(-EINVAL);
777 }
778
779 return drm_gem_cma_prime_vmap(obj);
780}
781
782struct drm_gem_object *
783vc4_prime_import_sg_table(struct drm_device *dev,
784 struct dma_buf_attachment *attach,
785 struct sg_table *sgt)
786{
787 struct drm_gem_object *obj;
788
789 obj = drm_gem_cma_prime_import_sg_table(dev, attach, sgt);
790 if (IS_ERR(obj))
791 return obj;
792
793 return obj;
794}
795
796static int vc4_grab_bin_bo(struct vc4_dev *vc4, struct vc4_file *vc4file)
797{
798 int ret;
799
800 if (!vc4->v3d)
801 return -ENODEV;
802
803 if (vc4file->bin_bo_used)
804 return 0;
805
806 ret = vc4_v3d_bin_bo_get(vc4, &vc4file->bin_bo_used);
807 if (ret)
808 return ret;
809
810 return 0;
811}
812
813int vc4_create_bo_ioctl(struct drm_device *dev, void *data,
814 struct drm_file *file_priv)
815{
816 struct drm_vc4_create_bo *args = data;
817 struct vc4_file *vc4file = file_priv->driver_priv;
818 struct vc4_dev *vc4 = to_vc4_dev(dev);
819 struct vc4_bo *bo = NULL;
820 int ret;
821
822 ret = vc4_grab_bin_bo(vc4, vc4file);
823 if (ret)
824 return ret;
825
826 /*
827 * We can't allocate from the BO cache, because the BOs don't
828 * get zeroed, and that might leak data between users.
829 */
830 bo = vc4_bo_create(dev, args->size, false, VC4_BO_TYPE_V3D);
831 if (IS_ERR(bo))
832 return PTR_ERR(bo);
833
834 bo->madv = VC4_MADV_WILLNEED;
835
836 ret = drm_gem_handle_create(file_priv, &bo->base.base, &args->handle);
837 drm_gem_object_put_unlocked(&bo->base.base);
838
839 return ret;
840}
841
842int vc4_mmap_bo_ioctl(struct drm_device *dev, void *data,
843 struct drm_file *file_priv)
844{
845 struct drm_vc4_mmap_bo *args = data;
846 struct drm_gem_object *gem_obj;
847
848 gem_obj = drm_gem_object_lookup(file_priv, args->handle);
849 if (!gem_obj) {
850 DRM_DEBUG("Failed to look up GEM BO %d\n", args->handle);
851 return -EINVAL;
852 }
853
854 /* The mmap offset was set up at BO allocation time. */
855 args->offset = drm_vma_node_offset_addr(&gem_obj->vma_node);
856
857 drm_gem_object_put_unlocked(gem_obj);
858 return 0;
859}
860
861int
862vc4_create_shader_bo_ioctl(struct drm_device *dev, void *data,
863 struct drm_file *file_priv)
864{
865 struct drm_vc4_create_shader_bo *args = data;
866 struct vc4_file *vc4file = file_priv->driver_priv;
867 struct vc4_dev *vc4 = to_vc4_dev(dev);
868 struct vc4_bo *bo = NULL;
869 int ret;
870
871 if (args->size == 0)
872 return -EINVAL;
873
874 if (args->size % sizeof(u64) != 0)
875 return -EINVAL;
876
877 if (args->flags != 0) {
878 DRM_INFO("Unknown flags set: 0x%08x\n", args->flags);
879 return -EINVAL;
880 }
881
882 if (args->pad != 0) {
883 DRM_INFO("Pad set: 0x%08x\n", args->pad);
884 return -EINVAL;
885 }
886
887 ret = vc4_grab_bin_bo(vc4, vc4file);
888 if (ret)
889 return ret;
890
891 bo = vc4_bo_create(dev, args->size, true, VC4_BO_TYPE_V3D_SHADER);
892 if (IS_ERR(bo))
893 return PTR_ERR(bo);
894
895 bo->madv = VC4_MADV_WILLNEED;
896
897 if (copy_from_user(bo->base.vaddr,
898 (void __user *)(uintptr_t)args->data,
899 args->size)) {
900 ret = -EFAULT;
901 goto fail;
902 }
903 /* Clear the rest of the memory from allocating from the BO
904 * cache.
905 */
906 memset(bo->base.vaddr + args->size, 0,
907 bo->base.base.size - args->size);
908
909 bo->validated_shader = vc4_validate_shader(&bo->base);
910 if (!bo->validated_shader) {
911 ret = -EINVAL;
912 goto fail;
913 }
914
915 /* We have to create the handle after validation, to avoid
916 * races for users to do doing things like mmap the shader BO.
917 */
918 ret = drm_gem_handle_create(file_priv, &bo->base.base, &args->handle);
919
920fail:
921 drm_gem_object_put_unlocked(&bo->base.base);
922
923 return ret;
924}
925
926/**
927 * vc4_set_tiling_ioctl() - Sets the tiling modifier for a BO.
928 * @dev: DRM device
929 * @data: ioctl argument
930 * @file_priv: DRM file for this fd
931 *
932 * The tiling state of the BO decides the default modifier of an fb if
933 * no specific modifier was set by userspace, and the return value of
934 * vc4_get_tiling_ioctl() (so that userspace can treat a BO it
935 * received from dmabuf as the same tiling format as the producer
936 * used).
937 */
938int vc4_set_tiling_ioctl(struct drm_device *dev, void *data,
939 struct drm_file *file_priv)
940{
941 struct drm_vc4_set_tiling *args = data;
942 struct drm_gem_object *gem_obj;
943 struct vc4_bo *bo;
944 bool t_format;
945
946 if (args->flags != 0)
947 return -EINVAL;
948
949 switch (args->modifier) {
950 case DRM_FORMAT_MOD_NONE:
951 t_format = false;
952 break;
953 case DRM_FORMAT_MOD_BROADCOM_VC4_T_TILED:
954 t_format = true;
955 break;
956 default:
957 return -EINVAL;
958 }
959
960 gem_obj = drm_gem_object_lookup(file_priv, args->handle);
961 if (!gem_obj) {
962 DRM_DEBUG("Failed to look up GEM BO %d\n", args->handle);
963 return -ENOENT;
964 }
965 bo = to_vc4_bo(gem_obj);
966 bo->t_format = t_format;
967
968 drm_gem_object_put_unlocked(gem_obj);
969
970 return 0;
971}
972
973/**
974 * vc4_get_tiling_ioctl() - Gets the tiling modifier for a BO.
975 * @dev: DRM device
976 * @data: ioctl argument
977 * @file_priv: DRM file for this fd
978 *
979 * Returns the tiling modifier for a BO as set by vc4_set_tiling_ioctl().
980 */
981int vc4_get_tiling_ioctl(struct drm_device *dev, void *data,
982 struct drm_file *file_priv)
983{
984 struct drm_vc4_get_tiling *args = data;
985 struct drm_gem_object *gem_obj;
986 struct vc4_bo *bo;
987
988 if (args->flags != 0 || args->modifier != 0)
989 return -EINVAL;
990
991 gem_obj = drm_gem_object_lookup(file_priv, args->handle);
992 if (!gem_obj) {
993 DRM_DEBUG("Failed to look up GEM BO %d\n", args->handle);
994 return -ENOENT;
995 }
996 bo = to_vc4_bo(gem_obj);
997
998 if (bo->t_format)
999 args->modifier = DRM_FORMAT_MOD_BROADCOM_VC4_T_TILED;
1000 else
1001 args->modifier = DRM_FORMAT_MOD_NONE;
1002
1003 drm_gem_object_put_unlocked(gem_obj);
1004
1005 return 0;
1006}
1007
1008int vc4_bo_cache_init(struct drm_device *dev)
1009{
1010 struct vc4_dev *vc4 = to_vc4_dev(dev);
1011 int i;
1012
1013 /* Create the initial set of BO labels that the kernel will
1014 * use. This lets us avoid a bunch of string reallocation in
1015 * the kernel's draw and BO allocation paths.
1016 */
1017 vc4->bo_labels = kcalloc(VC4_BO_TYPE_COUNT, sizeof(*vc4->bo_labels),
1018 GFP_KERNEL);
1019 if (!vc4->bo_labels)
1020 return -ENOMEM;
1021 vc4->num_labels = VC4_BO_TYPE_COUNT;
1022
1023 BUILD_BUG_ON(ARRAY_SIZE(bo_type_names) != VC4_BO_TYPE_COUNT);
1024 for (i = 0; i < VC4_BO_TYPE_COUNT; i++)
1025 vc4->bo_labels[i].name = bo_type_names[i];
1026
1027 mutex_init(&vc4->bo_lock);
1028
1029 vc4_debugfs_add_file(dev, "bo_stats", vc4_bo_stats_debugfs, NULL);
1030
1031 INIT_LIST_HEAD(&vc4->bo_cache.time_list);
1032
1033 INIT_WORK(&vc4->bo_cache.time_work, vc4_bo_cache_time_work);
1034 timer_setup(&vc4->bo_cache.time_timer, vc4_bo_cache_time_timer, 0);
1035
1036 return 0;
1037}
1038
1039void vc4_bo_cache_destroy(struct drm_device *dev)
1040{
1041 struct vc4_dev *vc4 = to_vc4_dev(dev);
1042 int i;
1043
1044 del_timer(&vc4->bo_cache.time_timer);
1045 cancel_work_sync(&vc4->bo_cache.time_work);
1046
1047 vc4_bo_cache_purge(dev);
1048
1049 for (i = 0; i < vc4->num_labels; i++) {
1050 if (vc4->bo_labels[i].num_allocated) {
1051 DRM_ERROR("Destroying BO cache with %d %s "
1052 "BOs still allocated\n",
1053 vc4->bo_labels[i].num_allocated,
1054 vc4->bo_labels[i].name);
1055 }
1056
1057 if (is_user_label(i))
1058 kfree(vc4->bo_labels[i].name);
1059 }
1060 kfree(vc4->bo_labels);
1061}
1062
1063int vc4_label_bo_ioctl(struct drm_device *dev, void *data,
1064 struct drm_file *file_priv)
1065{
1066 struct vc4_dev *vc4 = to_vc4_dev(dev);
1067 struct drm_vc4_label_bo *args = data;
1068 char *name;
1069 struct drm_gem_object *gem_obj;
1070 int ret = 0, label;
1071
1072 if (!args->len)
1073 return -EINVAL;
1074
1075 name = strndup_user(u64_to_user_ptr(args->name), args->len + 1);
1076 if (IS_ERR(name))
1077 return PTR_ERR(name);
1078
1079 gem_obj = drm_gem_object_lookup(file_priv, args->handle);
1080 if (!gem_obj) {
1081 DRM_ERROR("Failed to look up GEM BO %d\n", args->handle);
1082 kfree(name);
1083 return -ENOENT;
1084 }
1085
1086 mutex_lock(&vc4->bo_lock);
1087 label = vc4_get_user_label(vc4, name);
1088 if (label != -1)
1089 vc4_bo_set_label(gem_obj, label);
1090 else
1091 ret = -ENOMEM;
1092 mutex_unlock(&vc4->bo_lock);
1093
1094 drm_gem_object_put_unlocked(gem_obj);
1095
1096 return ret;
1097}