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1/*
2 * Copyright © 2015 Broadcom
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 */
8
9/* DOC: VC4 GEM BO management support.
10 *
11 * The VC4 GPU architecture (both scanout and rendering) has direct
12 * access to system memory with no MMU in between. To support it, we
13 * use the GEM CMA helper functions to allocate contiguous ranges of
14 * physical memory for our BOs.
15 *
16 * Since the CMA allocator is very slow, we keep a cache of recently
17 * freed BOs around so that the kernel's allocation of objects for 3D
18 * rendering can return quickly.
19 */
20
21#include "vc4_drv.h"
22#include "uapi/drm/vc4_drm.h"
23
24static void vc4_bo_stats_dump(struct vc4_dev *vc4)
25{
26 DRM_INFO("num bos allocated: %d\n",
27 vc4->bo_stats.num_allocated);
28 DRM_INFO("size bos allocated: %dkb\n",
29 vc4->bo_stats.size_allocated / 1024);
30 DRM_INFO("num bos used: %d\n",
31 vc4->bo_stats.num_allocated - vc4->bo_stats.num_cached);
32 DRM_INFO("size bos used: %dkb\n",
33 (vc4->bo_stats.size_allocated -
34 vc4->bo_stats.size_cached) / 1024);
35 DRM_INFO("num bos cached: %d\n",
36 vc4->bo_stats.num_cached);
37 DRM_INFO("size bos cached: %dkb\n",
38 vc4->bo_stats.size_cached / 1024);
39}
40
41#ifdef CONFIG_DEBUG_FS
42int vc4_bo_stats_debugfs(struct seq_file *m, void *unused)
43{
44 struct drm_info_node *node = (struct drm_info_node *)m->private;
45 struct drm_device *dev = node->minor->dev;
46 struct vc4_dev *vc4 = to_vc4_dev(dev);
47 struct vc4_bo_stats stats;
48
49 /* Take a snapshot of the current stats with the lock held. */
50 mutex_lock(&vc4->bo_lock);
51 stats = vc4->bo_stats;
52 mutex_unlock(&vc4->bo_lock);
53
54 seq_printf(m, "num bos allocated: %d\n",
55 stats.num_allocated);
56 seq_printf(m, "size bos allocated: %dkb\n",
57 stats.size_allocated / 1024);
58 seq_printf(m, "num bos used: %d\n",
59 stats.num_allocated - stats.num_cached);
60 seq_printf(m, "size bos used: %dkb\n",
61 (stats.size_allocated - stats.size_cached) / 1024);
62 seq_printf(m, "num bos cached: %d\n",
63 stats.num_cached);
64 seq_printf(m, "size bos cached: %dkb\n",
65 stats.size_cached / 1024);
66
67 return 0;
68}
69#endif
70
71static uint32_t bo_page_index(size_t size)
72{
73 return (size / PAGE_SIZE) - 1;
74}
75
76/* Must be called with bo_lock held. */
77static void vc4_bo_destroy(struct vc4_bo *bo)
78{
79 struct drm_gem_object *obj = &bo->base.base;
80 struct vc4_dev *vc4 = to_vc4_dev(obj->dev);
81
82 if (bo->validated_shader) {
83 kfree(bo->validated_shader->texture_samples);
84 kfree(bo->validated_shader);
85 bo->validated_shader = NULL;
86 }
87
88 vc4->bo_stats.num_allocated--;
89 vc4->bo_stats.size_allocated -= obj->size;
90 drm_gem_cma_free_object(obj);
91}
92
93/* Must be called with bo_lock held. */
94static void vc4_bo_remove_from_cache(struct vc4_bo *bo)
95{
96 struct drm_gem_object *obj = &bo->base.base;
97 struct vc4_dev *vc4 = to_vc4_dev(obj->dev);
98
99 vc4->bo_stats.num_cached--;
100 vc4->bo_stats.size_cached -= obj->size;
101
102 list_del(&bo->unref_head);
103 list_del(&bo->size_head);
104}
105
106static struct list_head *vc4_get_cache_list_for_size(struct drm_device *dev,
107 size_t size)
108{
109 struct vc4_dev *vc4 = to_vc4_dev(dev);
110 uint32_t page_index = bo_page_index(size);
111
112 if (vc4->bo_cache.size_list_size <= page_index) {
113 uint32_t new_size = max(vc4->bo_cache.size_list_size * 2,
114 page_index + 1);
115 struct list_head *new_list;
116 uint32_t i;
117
118 new_list = kmalloc_array(new_size, sizeof(struct list_head),
119 GFP_KERNEL);
120 if (!new_list)
121 return NULL;
122
123 /* Rebase the old cached BO lists to their new list
124 * head locations.
125 */
126 for (i = 0; i < vc4->bo_cache.size_list_size; i++) {
127 struct list_head *old_list =
128 &vc4->bo_cache.size_list[i];
129
130 if (list_empty(old_list))
131 INIT_LIST_HEAD(&new_list[i]);
132 else
133 list_replace(old_list, &new_list[i]);
134 }
135 /* And initialize the brand new BO list heads. */
136 for (i = vc4->bo_cache.size_list_size; i < new_size; i++)
137 INIT_LIST_HEAD(&new_list[i]);
138
139 kfree(vc4->bo_cache.size_list);
140 vc4->bo_cache.size_list = new_list;
141 vc4->bo_cache.size_list_size = new_size;
142 }
143
144 return &vc4->bo_cache.size_list[page_index];
145}
146
147static void vc4_bo_cache_purge(struct drm_device *dev)
148{
149 struct vc4_dev *vc4 = to_vc4_dev(dev);
150
151 mutex_lock(&vc4->bo_lock);
152 while (!list_empty(&vc4->bo_cache.time_list)) {
153 struct vc4_bo *bo = list_last_entry(&vc4->bo_cache.time_list,
154 struct vc4_bo, unref_head);
155 vc4_bo_remove_from_cache(bo);
156 vc4_bo_destroy(bo);
157 }
158 mutex_unlock(&vc4->bo_lock);
159}
160
161static struct vc4_bo *vc4_bo_get_from_cache(struct drm_device *dev,
162 uint32_t size)
163{
164 struct vc4_dev *vc4 = to_vc4_dev(dev);
165 uint32_t page_index = bo_page_index(size);
166 struct vc4_bo *bo = NULL;
167
168 size = roundup(size, PAGE_SIZE);
169
170 mutex_lock(&vc4->bo_lock);
171 if (page_index >= vc4->bo_cache.size_list_size)
172 goto out;
173
174 if (list_empty(&vc4->bo_cache.size_list[page_index]))
175 goto out;
176
177 bo = list_first_entry(&vc4->bo_cache.size_list[page_index],
178 struct vc4_bo, size_head);
179 vc4_bo_remove_from_cache(bo);
180 kref_init(&bo->base.base.refcount);
181
182out:
183 mutex_unlock(&vc4->bo_lock);
184 return bo;
185}
186
187/**
188 * vc4_gem_create_object - Implementation of driver->gem_create_object.
189 *
190 * This lets the CMA helpers allocate object structs for us, and keep
191 * our BO stats correct.
192 */
193struct drm_gem_object *vc4_create_object(struct drm_device *dev, size_t size)
194{
195 struct vc4_dev *vc4 = to_vc4_dev(dev);
196 struct vc4_bo *bo;
197
198 bo = kzalloc(sizeof(*bo), GFP_KERNEL);
199 if (!bo)
200 return ERR_PTR(-ENOMEM);
201
202 mutex_lock(&vc4->bo_lock);
203 vc4->bo_stats.num_allocated++;
204 vc4->bo_stats.size_allocated += size;
205 mutex_unlock(&vc4->bo_lock);
206
207 return &bo->base.base;
208}
209
210struct vc4_bo *vc4_bo_create(struct drm_device *dev, size_t unaligned_size,
211 bool from_cache)
212{
213 size_t size = roundup(unaligned_size, PAGE_SIZE);
214 struct vc4_dev *vc4 = to_vc4_dev(dev);
215 struct drm_gem_cma_object *cma_obj;
216
217 if (size == 0)
218 return ERR_PTR(-EINVAL);
219
220 /* First, try to get a vc4_bo from the kernel BO cache. */
221 if (from_cache) {
222 struct vc4_bo *bo = vc4_bo_get_from_cache(dev, size);
223
224 if (bo)
225 return bo;
226 }
227
228 cma_obj = drm_gem_cma_create(dev, size);
229 if (IS_ERR(cma_obj)) {
230 /*
231 * If we've run out of CMA memory, kill the cache of
232 * CMA allocations we've got laying around and try again.
233 */
234 vc4_bo_cache_purge(dev);
235
236 cma_obj = drm_gem_cma_create(dev, size);
237 if (IS_ERR(cma_obj)) {
238 DRM_ERROR("Failed to allocate from CMA:\n");
239 vc4_bo_stats_dump(vc4);
240 return ERR_PTR(-ENOMEM);
241 }
242 }
243
244 return to_vc4_bo(&cma_obj->base);
245}
246
247int vc4_dumb_create(struct drm_file *file_priv,
248 struct drm_device *dev,
249 struct drm_mode_create_dumb *args)
250{
251 int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
252 struct vc4_bo *bo = NULL;
253 int ret;
254
255 if (args->pitch < min_pitch)
256 args->pitch = min_pitch;
257
258 if (args->size < args->pitch * args->height)
259 args->size = args->pitch * args->height;
260
261 bo = vc4_bo_create(dev, args->size, false);
262 if (IS_ERR(bo))
263 return PTR_ERR(bo);
264
265 ret = drm_gem_handle_create(file_priv, &bo->base.base, &args->handle);
266 drm_gem_object_unreference_unlocked(&bo->base.base);
267
268 return ret;
269}
270
271/* Must be called with bo_lock held. */
272static void vc4_bo_cache_free_old(struct drm_device *dev)
273{
274 struct vc4_dev *vc4 = to_vc4_dev(dev);
275 unsigned long expire_time = jiffies - msecs_to_jiffies(1000);
276
277 while (!list_empty(&vc4->bo_cache.time_list)) {
278 struct vc4_bo *bo = list_last_entry(&vc4->bo_cache.time_list,
279 struct vc4_bo, unref_head);
280 if (time_before(expire_time, bo->free_time)) {
281 mod_timer(&vc4->bo_cache.time_timer,
282 round_jiffies_up(jiffies +
283 msecs_to_jiffies(1000)));
284 return;
285 }
286
287 vc4_bo_remove_from_cache(bo);
288 vc4_bo_destroy(bo);
289 }
290}
291
292/* Called on the last userspace/kernel unreference of the BO. Returns
293 * it to the BO cache if possible, otherwise frees it.
294 */
295void vc4_free_object(struct drm_gem_object *gem_bo)
296{
297 struct drm_device *dev = gem_bo->dev;
298 struct vc4_dev *vc4 = to_vc4_dev(dev);
299 struct vc4_bo *bo = to_vc4_bo(gem_bo);
300 struct list_head *cache_list;
301
302 mutex_lock(&vc4->bo_lock);
303 /* If the object references someone else's memory, we can't cache it.
304 */
305 if (gem_bo->import_attach) {
306 vc4_bo_destroy(bo);
307 goto out;
308 }
309
310 /* Don't cache if it was publicly named. */
311 if (gem_bo->name) {
312 vc4_bo_destroy(bo);
313 goto out;
314 }
315
316 cache_list = vc4_get_cache_list_for_size(dev, gem_bo->size);
317 if (!cache_list) {
318 vc4_bo_destroy(bo);
319 goto out;
320 }
321
322 if (bo->validated_shader) {
323 kfree(bo->validated_shader->texture_samples);
324 kfree(bo->validated_shader);
325 bo->validated_shader = NULL;
326 }
327
328 bo->free_time = jiffies;
329 list_add(&bo->size_head, cache_list);
330 list_add(&bo->unref_head, &vc4->bo_cache.time_list);
331
332 vc4->bo_stats.num_cached++;
333 vc4->bo_stats.size_cached += gem_bo->size;
334
335 vc4_bo_cache_free_old(dev);
336
337out:
338 mutex_unlock(&vc4->bo_lock);
339}
340
341static void vc4_bo_cache_time_work(struct work_struct *work)
342{
343 struct vc4_dev *vc4 =
344 container_of(work, struct vc4_dev, bo_cache.time_work);
345 struct drm_device *dev = vc4->dev;
346
347 mutex_lock(&vc4->bo_lock);
348 vc4_bo_cache_free_old(dev);
349 mutex_unlock(&vc4->bo_lock);
350}
351
352static void vc4_bo_cache_time_timer(unsigned long data)
353{
354 struct drm_device *dev = (struct drm_device *)data;
355 struct vc4_dev *vc4 = to_vc4_dev(dev);
356
357 schedule_work(&vc4->bo_cache.time_work);
358}
359
360struct dma_buf *
361vc4_prime_export(struct drm_device *dev, struct drm_gem_object *obj, int flags)
362{
363 struct vc4_bo *bo = to_vc4_bo(obj);
364
365 if (bo->validated_shader) {
366 DRM_ERROR("Attempting to export shader BO\n");
367 return ERR_PTR(-EINVAL);
368 }
369
370 return drm_gem_prime_export(dev, obj, flags);
371}
372
373int vc4_mmap(struct file *filp, struct vm_area_struct *vma)
374{
375 struct drm_gem_object *gem_obj;
376 struct vc4_bo *bo;
377 int ret;
378
379 ret = drm_gem_mmap(filp, vma);
380 if (ret)
381 return ret;
382
383 gem_obj = vma->vm_private_data;
384 bo = to_vc4_bo(gem_obj);
385
386 if (bo->validated_shader && (vma->vm_flags & VM_WRITE)) {
387 DRM_ERROR("mmaping of shader BOs for writing not allowed.\n");
388 return -EINVAL;
389 }
390
391 /*
392 * Clear the VM_PFNMAP flag that was set by drm_gem_mmap(), and set the
393 * vm_pgoff (used as a fake buffer offset by DRM) to 0 as we want to map
394 * the whole buffer.
395 */
396 vma->vm_flags &= ~VM_PFNMAP;
397 vma->vm_pgoff = 0;
398
399 ret = dma_mmap_wc(bo->base.base.dev->dev, vma, bo->base.vaddr,
400 bo->base.paddr, vma->vm_end - vma->vm_start);
401 if (ret)
402 drm_gem_vm_close(vma);
403
404 return ret;
405}
406
407int vc4_prime_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma)
408{
409 struct vc4_bo *bo = to_vc4_bo(obj);
410
411 if (bo->validated_shader && (vma->vm_flags & VM_WRITE)) {
412 DRM_ERROR("mmaping of shader BOs for writing not allowed.\n");
413 return -EINVAL;
414 }
415
416 return drm_gem_cma_prime_mmap(obj, vma);
417}
418
419void *vc4_prime_vmap(struct drm_gem_object *obj)
420{
421 struct vc4_bo *bo = to_vc4_bo(obj);
422
423 if (bo->validated_shader) {
424 DRM_ERROR("mmaping of shader BOs not allowed.\n");
425 return ERR_PTR(-EINVAL);
426 }
427
428 return drm_gem_cma_prime_vmap(obj);
429}
430
431int vc4_create_bo_ioctl(struct drm_device *dev, void *data,
432 struct drm_file *file_priv)
433{
434 struct drm_vc4_create_bo *args = data;
435 struct vc4_bo *bo = NULL;
436 int ret;
437
438 /*
439 * We can't allocate from the BO cache, because the BOs don't
440 * get zeroed, and that might leak data between users.
441 */
442 bo = vc4_bo_create(dev, args->size, false);
443 if (IS_ERR(bo))
444 return PTR_ERR(bo);
445
446 ret = drm_gem_handle_create(file_priv, &bo->base.base, &args->handle);
447 drm_gem_object_unreference_unlocked(&bo->base.base);
448
449 return ret;
450}
451
452int vc4_mmap_bo_ioctl(struct drm_device *dev, void *data,
453 struct drm_file *file_priv)
454{
455 struct drm_vc4_mmap_bo *args = data;
456 struct drm_gem_object *gem_obj;
457
458 gem_obj = drm_gem_object_lookup(file_priv, args->handle);
459 if (!gem_obj) {
460 DRM_ERROR("Failed to look up GEM BO %d\n", args->handle);
461 return -EINVAL;
462 }
463
464 /* The mmap offset was set up at BO allocation time. */
465 args->offset = drm_vma_node_offset_addr(&gem_obj->vma_node);
466
467 drm_gem_object_unreference_unlocked(gem_obj);
468 return 0;
469}
470
471int
472vc4_create_shader_bo_ioctl(struct drm_device *dev, void *data,
473 struct drm_file *file_priv)
474{
475 struct drm_vc4_create_shader_bo *args = data;
476 struct vc4_bo *bo = NULL;
477 int ret;
478
479 if (args->size == 0)
480 return -EINVAL;
481
482 if (args->size % sizeof(u64) != 0)
483 return -EINVAL;
484
485 if (args->flags != 0) {
486 DRM_INFO("Unknown flags set: 0x%08x\n", args->flags);
487 return -EINVAL;
488 }
489
490 if (args->pad != 0) {
491 DRM_INFO("Pad set: 0x%08x\n", args->pad);
492 return -EINVAL;
493 }
494
495 bo = vc4_bo_create(dev, args->size, true);
496 if (IS_ERR(bo))
497 return PTR_ERR(bo);
498
499 if (copy_from_user(bo->base.vaddr,
500 (void __user *)(uintptr_t)args->data,
501 args->size)) {
502 ret = -EFAULT;
503 goto fail;
504 }
505 /* Clear the rest of the memory from allocating from the BO
506 * cache.
507 */
508 memset(bo->base.vaddr + args->size, 0,
509 bo->base.base.size - args->size);
510
511 bo->validated_shader = vc4_validate_shader(&bo->base);
512 if (!bo->validated_shader) {
513 ret = -EINVAL;
514 goto fail;
515 }
516
517 /* We have to create the handle after validation, to avoid
518 * races for users to do doing things like mmap the shader BO.
519 */
520 ret = drm_gem_handle_create(file_priv, &bo->base.base, &args->handle);
521
522 fail:
523 drm_gem_object_unreference_unlocked(&bo->base.base);
524
525 return ret;
526}
527
528void vc4_bo_cache_init(struct drm_device *dev)
529{
530 struct vc4_dev *vc4 = to_vc4_dev(dev);
531
532 mutex_init(&vc4->bo_lock);
533
534 INIT_LIST_HEAD(&vc4->bo_cache.time_list);
535
536 INIT_WORK(&vc4->bo_cache.time_work, vc4_bo_cache_time_work);
537 setup_timer(&vc4->bo_cache.time_timer,
538 vc4_bo_cache_time_timer,
539 (unsigned long)dev);
540}
541
542void vc4_bo_cache_destroy(struct drm_device *dev)
543{
544 struct vc4_dev *vc4 = to_vc4_dev(dev);
545
546 del_timer(&vc4->bo_cache.time_timer);
547 cancel_work_sync(&vc4->bo_cache.time_work);
548
549 vc4_bo_cache_purge(dev);
550
551 if (vc4->bo_stats.num_allocated) {
552 DRM_ERROR("Destroying BO cache while BOs still allocated:\n");
553 vc4_bo_stats_dump(vc4);
554 }
555}