Commit | Line | Data |
---|---|---|
1a758d4e PO |
1 | /* |
2 | * videobuf2-dma-contig.c - DMA contig memory allocator for videobuf2 | |
3 | * | |
4 | * Copyright (C) 2010 Samsung Electronics | |
5 | * | |
95072084 | 6 | * Author: Pawel Osciak <pawel@osciak.com> |
1a758d4e PO |
7 | * |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation. | |
11 | */ | |
12 | ||
8c417d03 | 13 | #include <linux/dma-buf.h> |
1a758d4e | 14 | #include <linux/module.h> |
e15dab75 TS |
15 | #include <linux/scatterlist.h> |
16 | #include <linux/sched.h> | |
1a758d4e PO |
17 | #include <linux/slab.h> |
18 | #include <linux/dma-mapping.h> | |
19 | ||
20 | #include <media/videobuf2-core.h> | |
d0df3c38 | 21 | #include <media/videobuf2-dma-contig.h> |
1a758d4e PO |
22 | #include <media/videobuf2-memops.h> |
23 | ||
24 | struct vb2_dc_conf { | |
25 | struct device *dev; | |
26 | }; | |
27 | ||
28 | struct vb2_dc_buf { | |
72f86bff | 29 | struct device *dev; |
1a758d4e | 30 | void *vaddr; |
1a758d4e | 31 | unsigned long size; |
40d8b766 | 32 | dma_addr_t dma_addr; |
e15dab75 TS |
33 | enum dma_data_direction dma_dir; |
34 | struct sg_table *dma_sgt; | |
40d8b766 LP |
35 | |
36 | /* MMAP related */ | |
1a758d4e | 37 | struct vb2_vmarea_handler handler; |
40d8b766 | 38 | atomic_t refcount; |
9ef2cbeb | 39 | struct sg_table *sgt_base; |
40d8b766 LP |
40 | |
41 | /* USERPTR related */ | |
42 | struct vm_area_struct *vma; | |
8c417d03 SS |
43 | |
44 | /* DMABUF related */ | |
45 | struct dma_buf_attachment *db_attach; | |
1a758d4e PO |
46 | }; |
47 | ||
e15dab75 TS |
48 | /*********************************************/ |
49 | /* scatterlist table functions */ | |
50 | /*********************************************/ | |
51 | ||
52 | ||
53 | static void vb2_dc_sgt_foreach_page(struct sg_table *sgt, | |
54 | void (*cb)(struct page *pg)) | |
55 | { | |
56 | struct scatterlist *s; | |
57 | unsigned int i; | |
58 | ||
59 | for_each_sg(sgt->sgl, s, sgt->orig_nents, i) { | |
60 | struct page *page = sg_page(s); | |
61 | unsigned int n_pages = PAGE_ALIGN(s->offset + s->length) | |
62 | >> PAGE_SHIFT; | |
63 | unsigned int j; | |
64 | ||
65 | for (j = 0; j < n_pages; ++j, ++page) | |
66 | cb(page); | |
67 | } | |
68 | } | |
69 | ||
70 | static unsigned long vb2_dc_get_contiguous_size(struct sg_table *sgt) | |
71 | { | |
72 | struct scatterlist *s; | |
73 | dma_addr_t expected = sg_dma_address(sgt->sgl); | |
74 | unsigned int i; | |
75 | unsigned long size = 0; | |
76 | ||
77 | for_each_sg(sgt->sgl, s, sgt->nents, i) { | |
78 | if (sg_dma_address(s) != expected) | |
79 | break; | |
80 | expected = sg_dma_address(s) + sg_dma_len(s); | |
81 | size += sg_dma_len(s); | |
82 | } | |
83 | return size; | |
84 | } | |
85 | ||
40d8b766 LP |
86 | /*********************************************/ |
87 | /* callbacks for all buffers */ | |
88 | /*********************************************/ | |
89 | ||
90 | static void *vb2_dc_cookie(void *buf_priv) | |
91 | { | |
92 | struct vb2_dc_buf *buf = buf_priv; | |
93 | ||
94 | return &buf->dma_addr; | |
95 | } | |
96 | ||
97 | static void *vb2_dc_vaddr(void *buf_priv) | |
98 | { | |
99 | struct vb2_dc_buf *buf = buf_priv; | |
100 | ||
6bbd4fec PZ |
101 | if (!buf->vaddr && buf->db_attach) |
102 | buf->vaddr = dma_buf_vmap(buf->db_attach->dmabuf); | |
103 | ||
40d8b766 LP |
104 | return buf->vaddr; |
105 | } | |
106 | ||
107 | static unsigned int vb2_dc_num_users(void *buf_priv) | |
108 | { | |
109 | struct vb2_dc_buf *buf = buf_priv; | |
110 | ||
111 | return atomic_read(&buf->refcount); | |
112 | } | |
113 | ||
199d101e MS |
114 | static void vb2_dc_prepare(void *buf_priv) |
115 | { | |
116 | struct vb2_dc_buf *buf = buf_priv; | |
117 | struct sg_table *sgt = buf->dma_sgt; | |
118 | ||
8c417d03 SS |
119 | /* DMABUF exporter will flush the cache for us */ |
120 | if (!sgt || buf->db_attach) | |
199d101e MS |
121 | return; |
122 | ||
123 | dma_sync_sg_for_device(buf->dev, sgt->sgl, sgt->nents, buf->dma_dir); | |
124 | } | |
125 | ||
126 | static void vb2_dc_finish(void *buf_priv) | |
127 | { | |
128 | struct vb2_dc_buf *buf = buf_priv; | |
129 | struct sg_table *sgt = buf->dma_sgt; | |
130 | ||
8c417d03 SS |
131 | /* DMABUF exporter will flush the cache for us */ |
132 | if (!sgt || buf->db_attach) | |
199d101e MS |
133 | return; |
134 | ||
135 | dma_sync_sg_for_cpu(buf->dev, sgt->sgl, sgt->nents, buf->dma_dir); | |
136 | } | |
137 | ||
40d8b766 LP |
138 | /*********************************************/ |
139 | /* callbacks for MMAP buffers */ | |
140 | /*********************************************/ | |
141 | ||
142 | static void vb2_dc_put(void *buf_priv) | |
143 | { | |
144 | struct vb2_dc_buf *buf = buf_priv; | |
145 | ||
146 | if (!atomic_dec_and_test(&buf->refcount)) | |
147 | return; | |
148 | ||
9ef2cbeb TS |
149 | if (buf->sgt_base) { |
150 | sg_free_table(buf->sgt_base); | |
151 | kfree(buf->sgt_base); | |
152 | } | |
40d8b766 | 153 | dma_free_coherent(buf->dev, buf->size, buf->vaddr, buf->dma_addr); |
67a5d0ce | 154 | put_device(buf->dev); |
40d8b766 LP |
155 | kfree(buf); |
156 | } | |
1a758d4e | 157 | |
d935c57e HV |
158 | static void *vb2_dc_alloc(void *alloc_ctx, unsigned long size, |
159 | enum dma_data_direction dma_dir, gfp_t gfp_flags) | |
1a758d4e PO |
160 | { |
161 | struct vb2_dc_conf *conf = alloc_ctx; | |
72f86bff | 162 | struct device *dev = conf->dev; |
1a758d4e PO |
163 | struct vb2_dc_buf *buf; |
164 | ||
165 | buf = kzalloc(sizeof *buf, GFP_KERNEL); | |
166 | if (!buf) | |
167 | return ERR_PTR(-ENOMEM); | |
168 | ||
b6ba2057 HV |
169 | buf->vaddr = dma_alloc_coherent(dev, size, &buf->dma_addr, |
170 | GFP_KERNEL | gfp_flags); | |
1a758d4e | 171 | if (!buf->vaddr) { |
72f86bff | 172 | dev_err(dev, "dma_alloc_coherent of size %ld failed\n", size); |
1a758d4e PO |
173 | kfree(buf); |
174 | return ERR_PTR(-ENOMEM); | |
175 | } | |
176 | ||
67a5d0ce TS |
177 | /* Prevent the device from being released while the buffer is used */ |
178 | buf->dev = get_device(dev); | |
1a758d4e | 179 | buf->size = size; |
d935c57e | 180 | buf->dma_dir = dma_dir; |
1a758d4e PO |
181 | |
182 | buf->handler.refcount = &buf->refcount; | |
f7f129ce | 183 | buf->handler.put = vb2_dc_put; |
1a758d4e PO |
184 | buf->handler.arg = buf; |
185 | ||
186 | atomic_inc(&buf->refcount); | |
187 | ||
188 | return buf; | |
189 | } | |
190 | ||
f7f129ce | 191 | static int vb2_dc_mmap(void *buf_priv, struct vm_area_struct *vma) |
1a758d4e PO |
192 | { |
193 | struct vb2_dc_buf *buf = buf_priv; | |
c60520fa | 194 | int ret; |
1a758d4e PO |
195 | |
196 | if (!buf) { | |
197 | printk(KERN_ERR "No buffer to map\n"); | |
198 | return -EINVAL; | |
199 | } | |
200 | ||
c60520fa MS |
201 | /* |
202 | * dma_mmap_* uses vm_pgoff as in-buffer offset, but we want to | |
203 | * map whole buffer | |
204 | */ | |
205 | vma->vm_pgoff = 0; | |
206 | ||
207 | ret = dma_mmap_coherent(buf->dev, vma, buf->vaddr, | |
208 | buf->dma_addr, buf->size); | |
209 | ||
210 | if (ret) { | |
211 | pr_err("Remapping memory failed, error: %d\n", ret); | |
212 | return ret; | |
213 | } | |
214 | ||
215 | vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; | |
216 | vma->vm_private_data = &buf->handler; | |
217 | vma->vm_ops = &vb2_common_vm_ops; | |
218 | ||
219 | vma->vm_ops->open(vma); | |
220 | ||
221 | pr_debug("%s: mapped dma addr 0x%08lx at 0x%08lx, size %ld\n", | |
222 | __func__, (unsigned long)buf->dma_addr, vma->vm_start, | |
223 | buf->size); | |
224 | ||
225 | return 0; | |
1a758d4e PO |
226 | } |
227 | ||
9ef2cbeb TS |
228 | /*********************************************/ |
229 | /* DMABUF ops for exporters */ | |
230 | /*********************************************/ | |
231 | ||
232 | struct vb2_dc_attachment { | |
233 | struct sg_table sgt; | |
cd474037 | 234 | enum dma_data_direction dma_dir; |
9ef2cbeb TS |
235 | }; |
236 | ||
237 | static int vb2_dc_dmabuf_ops_attach(struct dma_buf *dbuf, struct device *dev, | |
238 | struct dma_buf_attachment *dbuf_attach) | |
239 | { | |
240 | struct vb2_dc_attachment *attach; | |
241 | unsigned int i; | |
242 | struct scatterlist *rd, *wr; | |
243 | struct sg_table *sgt; | |
244 | struct vb2_dc_buf *buf = dbuf->priv; | |
245 | int ret; | |
246 | ||
247 | attach = kzalloc(sizeof(*attach), GFP_KERNEL); | |
248 | if (!attach) | |
249 | return -ENOMEM; | |
250 | ||
251 | sgt = &attach->sgt; | |
252 | /* Copy the buf->base_sgt scatter list to the attachment, as we can't | |
253 | * map the same scatter list to multiple attachments at the same time. | |
254 | */ | |
255 | ret = sg_alloc_table(sgt, buf->sgt_base->orig_nents, GFP_KERNEL); | |
256 | if (ret) { | |
257 | kfree(attach); | |
258 | return -ENOMEM; | |
259 | } | |
260 | ||
261 | rd = buf->sgt_base->sgl; | |
262 | wr = sgt->sgl; | |
263 | for (i = 0; i < sgt->orig_nents; ++i) { | |
264 | sg_set_page(wr, sg_page(rd), rd->length, rd->offset); | |
265 | rd = sg_next(rd); | |
266 | wr = sg_next(wr); | |
267 | } | |
268 | ||
cd474037 | 269 | attach->dma_dir = DMA_NONE; |
9ef2cbeb TS |
270 | dbuf_attach->priv = attach; |
271 | ||
272 | return 0; | |
273 | } | |
274 | ||
275 | static void vb2_dc_dmabuf_ops_detach(struct dma_buf *dbuf, | |
276 | struct dma_buf_attachment *db_attach) | |
277 | { | |
278 | struct vb2_dc_attachment *attach = db_attach->priv; | |
279 | struct sg_table *sgt; | |
280 | ||
281 | if (!attach) | |
282 | return; | |
283 | ||
284 | sgt = &attach->sgt; | |
285 | ||
286 | /* release the scatterlist cache */ | |
cd474037 | 287 | if (attach->dma_dir != DMA_NONE) |
9ef2cbeb | 288 | dma_unmap_sg(db_attach->dev, sgt->sgl, sgt->orig_nents, |
cd474037 | 289 | attach->dma_dir); |
9ef2cbeb TS |
290 | sg_free_table(sgt); |
291 | kfree(attach); | |
292 | db_attach->priv = NULL; | |
293 | } | |
294 | ||
295 | static struct sg_table *vb2_dc_dmabuf_ops_map( | |
cd474037 | 296 | struct dma_buf_attachment *db_attach, enum dma_data_direction dma_dir) |
9ef2cbeb TS |
297 | { |
298 | struct vb2_dc_attachment *attach = db_attach->priv; | |
299 | /* stealing dmabuf mutex to serialize map/unmap operations */ | |
300 | struct mutex *lock = &db_attach->dmabuf->lock; | |
301 | struct sg_table *sgt; | |
9ef2cbeb TS |
302 | |
303 | mutex_lock(lock); | |
304 | ||
305 | sgt = &attach->sgt; | |
306 | /* return previously mapped sg table */ | |
cd474037 | 307 | if (attach->dma_dir == dma_dir) { |
9ef2cbeb TS |
308 | mutex_unlock(lock); |
309 | return sgt; | |
310 | } | |
311 | ||
312 | /* release any previous cache */ | |
cd474037 | 313 | if (attach->dma_dir != DMA_NONE) { |
9ef2cbeb | 314 | dma_unmap_sg(db_attach->dev, sgt->sgl, sgt->orig_nents, |
cd474037 HV |
315 | attach->dma_dir); |
316 | attach->dma_dir = DMA_NONE; | |
9ef2cbeb TS |
317 | } |
318 | ||
319 | /* mapping to the client with new direction */ | |
60a47192 RR |
320 | sgt->nents = dma_map_sg(db_attach->dev, sgt->sgl, sgt->orig_nents, |
321 | dma_dir); | |
322 | if (!sgt->nents) { | |
9ef2cbeb TS |
323 | pr_err("failed to map scatterlist\n"); |
324 | mutex_unlock(lock); | |
325 | return ERR_PTR(-EIO); | |
326 | } | |
327 | ||
cd474037 | 328 | attach->dma_dir = dma_dir; |
9ef2cbeb TS |
329 | |
330 | mutex_unlock(lock); | |
331 | ||
332 | return sgt; | |
333 | } | |
334 | ||
335 | static void vb2_dc_dmabuf_ops_unmap(struct dma_buf_attachment *db_attach, | |
cd474037 | 336 | struct sg_table *sgt, enum dma_data_direction dma_dir) |
9ef2cbeb TS |
337 | { |
338 | /* nothing to be done here */ | |
339 | } | |
340 | ||
341 | static void vb2_dc_dmabuf_ops_release(struct dma_buf *dbuf) | |
342 | { | |
343 | /* drop reference obtained in vb2_dc_get_dmabuf */ | |
344 | vb2_dc_put(dbuf->priv); | |
345 | } | |
346 | ||
347 | static void *vb2_dc_dmabuf_ops_kmap(struct dma_buf *dbuf, unsigned long pgnum) | |
348 | { | |
349 | struct vb2_dc_buf *buf = dbuf->priv; | |
350 | ||
351 | return buf->vaddr + pgnum * PAGE_SIZE; | |
352 | } | |
353 | ||
354 | static void *vb2_dc_dmabuf_ops_vmap(struct dma_buf *dbuf) | |
355 | { | |
356 | struct vb2_dc_buf *buf = dbuf->priv; | |
357 | ||
358 | return buf->vaddr; | |
359 | } | |
360 | ||
361 | static int vb2_dc_dmabuf_ops_mmap(struct dma_buf *dbuf, | |
362 | struct vm_area_struct *vma) | |
363 | { | |
364 | return vb2_dc_mmap(dbuf->priv, vma); | |
365 | } | |
366 | ||
367 | static struct dma_buf_ops vb2_dc_dmabuf_ops = { | |
368 | .attach = vb2_dc_dmabuf_ops_attach, | |
369 | .detach = vb2_dc_dmabuf_ops_detach, | |
370 | .map_dma_buf = vb2_dc_dmabuf_ops_map, | |
371 | .unmap_dma_buf = vb2_dc_dmabuf_ops_unmap, | |
372 | .kmap = vb2_dc_dmabuf_ops_kmap, | |
373 | .kmap_atomic = vb2_dc_dmabuf_ops_kmap, | |
374 | .vmap = vb2_dc_dmabuf_ops_vmap, | |
375 | .mmap = vb2_dc_dmabuf_ops_mmap, | |
376 | .release = vb2_dc_dmabuf_ops_release, | |
377 | }; | |
378 | ||
379 | static struct sg_table *vb2_dc_get_base_sgt(struct vb2_dc_buf *buf) | |
380 | { | |
381 | int ret; | |
382 | struct sg_table *sgt; | |
383 | ||
384 | sgt = kmalloc(sizeof(*sgt), GFP_KERNEL); | |
385 | if (!sgt) { | |
386 | dev_err(buf->dev, "failed to alloc sg table\n"); | |
387 | return NULL; | |
388 | } | |
389 | ||
390 | ret = dma_get_sgtable(buf->dev, sgt, buf->vaddr, buf->dma_addr, | |
391 | buf->size); | |
392 | if (ret < 0) { | |
393 | dev_err(buf->dev, "failed to get scatterlist from DMA API\n"); | |
394 | kfree(sgt); | |
395 | return NULL; | |
396 | } | |
397 | ||
398 | return sgt; | |
399 | } | |
400 | ||
c1b96a23 | 401 | static struct dma_buf *vb2_dc_get_dmabuf(void *buf_priv, unsigned long flags) |
9ef2cbeb TS |
402 | { |
403 | struct vb2_dc_buf *buf = buf_priv; | |
404 | struct dma_buf *dbuf; | |
d8fbe341 SS |
405 | DEFINE_DMA_BUF_EXPORT_INFO(exp_info); |
406 | ||
407 | exp_info.ops = &vb2_dc_dmabuf_ops; | |
408 | exp_info.size = buf->size; | |
409 | exp_info.flags = flags; | |
410 | exp_info.priv = buf; | |
9ef2cbeb TS |
411 | |
412 | if (!buf->sgt_base) | |
413 | buf->sgt_base = vb2_dc_get_base_sgt(buf); | |
414 | ||
415 | if (WARN_ON(!buf->sgt_base)) | |
416 | return NULL; | |
417 | ||
d8fbe341 | 418 | dbuf = dma_buf_export(&exp_info); |
9ef2cbeb TS |
419 | if (IS_ERR(dbuf)) |
420 | return NULL; | |
421 | ||
422 | /* dmabuf keeps reference to vb2 buffer */ | |
423 | atomic_inc(&buf->refcount); | |
424 | ||
425 | return dbuf; | |
426 | } | |
427 | ||
40d8b766 LP |
428 | /*********************************************/ |
429 | /* callbacks for USERPTR buffers */ | |
430 | /*********************************************/ | |
431 | ||
e15dab75 TS |
432 | static inline int vma_is_io(struct vm_area_struct *vma) |
433 | { | |
434 | return !!(vma->vm_flags & (VM_IO | VM_PFNMAP)); | |
435 | } | |
436 | ||
774d2301 MS |
437 | static int vb2_dc_get_user_pfn(unsigned long start, int n_pages, |
438 | struct vm_area_struct *vma, unsigned long *res) | |
439 | { | |
440 | unsigned long pfn, start_pfn, prev_pfn; | |
441 | unsigned int i; | |
442 | int ret; | |
443 | ||
444 | if (!vma_is_io(vma)) | |
445 | return -EFAULT; | |
446 | ||
447 | ret = follow_pfn(vma, start, &pfn); | |
448 | if (ret) | |
449 | return ret; | |
450 | ||
451 | start_pfn = pfn; | |
452 | start += PAGE_SIZE; | |
453 | ||
454 | for (i = 1; i < n_pages; ++i, start += PAGE_SIZE) { | |
455 | prev_pfn = pfn; | |
456 | ret = follow_pfn(vma, start, &pfn); | |
457 | ||
458 | if (ret) { | |
459 | pr_err("no page for address %lu\n", start); | |
460 | return ret; | |
461 | } | |
462 | if (pfn != prev_pfn + 1) | |
463 | return -EINVAL; | |
464 | } | |
465 | ||
466 | *res = start_pfn; | |
467 | return 0; | |
468 | } | |
469 | ||
e15dab75 | 470 | static int vb2_dc_get_user_pages(unsigned long start, struct page **pages, |
cd474037 HV |
471 | int n_pages, struct vm_area_struct *vma, |
472 | enum dma_data_direction dma_dir) | |
e15dab75 TS |
473 | { |
474 | if (vma_is_io(vma)) { | |
475 | unsigned int i; | |
476 | ||
477 | for (i = 0; i < n_pages; ++i, start += PAGE_SIZE) { | |
478 | unsigned long pfn; | |
479 | int ret = follow_pfn(vma, start, &pfn); | |
480 | ||
774d2301 MS |
481 | if (!pfn_valid(pfn)) |
482 | return -EINVAL; | |
483 | ||
e15dab75 TS |
484 | if (ret) { |
485 | pr_err("no page for address %lu\n", start); | |
486 | return ret; | |
487 | } | |
488 | pages[i] = pfn_to_page(pfn); | |
489 | } | |
490 | } else { | |
491 | int n; | |
492 | ||
493 | n = get_user_pages(current, current->mm, start & PAGE_MASK, | |
cd474037 | 494 | n_pages, dma_dir == DMA_FROM_DEVICE, 1, pages, NULL); |
e15dab75 TS |
495 | /* negative error means that no page was pinned */ |
496 | n = max(n, 0); | |
497 | if (n != n_pages) { | |
498 | pr_err("got only %d of %d user pages\n", n, n_pages); | |
499 | while (n) | |
500 | put_page(pages[--n]); | |
501 | return -EFAULT; | |
502 | } | |
503 | } | |
504 | ||
505 | return 0; | |
506 | } | |
507 | ||
508 | static void vb2_dc_put_dirty_page(struct page *page) | |
509 | { | |
510 | set_page_dirty_lock(page); | |
511 | put_page(page); | |
512 | } | |
513 | ||
514 | static void vb2_dc_put_userptr(void *buf_priv) | |
515 | { | |
516 | struct vb2_dc_buf *buf = buf_priv; | |
517 | struct sg_table *sgt = buf->dma_sgt; | |
518 | ||
774d2301 | 519 | if (sgt) { |
251a79f8 HV |
520 | DEFINE_DMA_ATTRS(attrs); |
521 | ||
522 | dma_set_attr(DMA_ATTR_SKIP_CPU_SYNC, &attrs); | |
523 | /* | |
524 | * No need to sync to CPU, it's already synced to the CPU | |
525 | * since the finish() memop will have been called before this. | |
526 | */ | |
527 | dma_unmap_sg_attrs(buf->dev, sgt->sgl, sgt->orig_nents, | |
528 | buf->dma_dir, &attrs); | |
774d2301 MS |
529 | if (!vma_is_io(buf->vma)) |
530 | vb2_dc_sgt_foreach_page(sgt, vb2_dc_put_dirty_page); | |
e15dab75 | 531 | |
774d2301 MS |
532 | sg_free_table(sgt); |
533 | kfree(sgt); | |
534 | } | |
e15dab75 TS |
535 | vb2_put_vma(buf->vma); |
536 | kfree(buf); | |
537 | } | |
538 | ||
774d2301 MS |
539 | /* |
540 | * For some kind of reserved memory there might be no struct page available, | |
541 | * so all that can be done to support such 'pages' is to try to convert | |
542 | * pfn to dma address or at the last resort just assume that | |
543 | * dma address == physical address (like it has been assumed in earlier version | |
544 | * of videobuf2-dma-contig | |
545 | */ | |
546 | ||
547 | #ifdef __arch_pfn_to_dma | |
548 | static inline dma_addr_t vb2_dc_pfn_to_dma(struct device *dev, unsigned long pfn) | |
549 | { | |
550 | return (dma_addr_t)__arch_pfn_to_dma(dev, pfn); | |
551 | } | |
552 | #elif defined(__pfn_to_bus) | |
553 | static inline dma_addr_t vb2_dc_pfn_to_dma(struct device *dev, unsigned long pfn) | |
554 | { | |
555 | return (dma_addr_t)__pfn_to_bus(pfn); | |
556 | } | |
557 | #elif defined(__pfn_to_phys) | |
558 | static inline dma_addr_t vb2_dc_pfn_to_dma(struct device *dev, unsigned long pfn) | |
559 | { | |
560 | return (dma_addr_t)__pfn_to_phys(pfn); | |
561 | } | |
562 | #else | |
563 | static inline dma_addr_t vb2_dc_pfn_to_dma(struct device *dev, unsigned long pfn) | |
564 | { | |
565 | /* really, we cannot do anything better at this point */ | |
566 | return (dma_addr_t)(pfn) << PAGE_SHIFT; | |
567 | } | |
568 | #endif | |
569 | ||
f7f129ce | 570 | static void *vb2_dc_get_userptr(void *alloc_ctx, unsigned long vaddr, |
cd474037 | 571 | unsigned long size, enum dma_data_direction dma_dir) |
1a758d4e | 572 | { |
e15dab75 | 573 | struct vb2_dc_conf *conf = alloc_ctx; |
1a758d4e | 574 | struct vb2_dc_buf *buf; |
e15dab75 TS |
575 | unsigned long start; |
576 | unsigned long end; | |
577 | unsigned long offset; | |
578 | struct page **pages; | |
579 | int n_pages; | |
580 | int ret = 0; | |
1a758d4e | 581 | struct vm_area_struct *vma; |
e15dab75 TS |
582 | struct sg_table *sgt; |
583 | unsigned long contig_size; | |
d81e870d | 584 | unsigned long dma_align = dma_get_cache_alignment(); |
251a79f8 HV |
585 | DEFINE_DMA_ATTRS(attrs); |
586 | ||
587 | dma_set_attr(DMA_ATTR_SKIP_CPU_SYNC, &attrs); | |
d81e870d MS |
588 | |
589 | /* Only cache aligned DMA transfers are reliable */ | |
590 | if (!IS_ALIGNED(vaddr | size, dma_align)) { | |
591 | pr_debug("user data must be aligned to %lu bytes\n", dma_align); | |
592 | return ERR_PTR(-EINVAL); | |
593 | } | |
594 | ||
595 | if (!size) { | |
596 | pr_debug("size is zero\n"); | |
597 | return ERR_PTR(-EINVAL); | |
598 | } | |
1a758d4e PO |
599 | |
600 | buf = kzalloc(sizeof *buf, GFP_KERNEL); | |
601 | if (!buf) | |
602 | return ERR_PTR(-ENOMEM); | |
603 | ||
e15dab75 | 604 | buf->dev = conf->dev; |
cd474037 | 605 | buf->dma_dir = dma_dir; |
e15dab75 TS |
606 | |
607 | start = vaddr & PAGE_MASK; | |
608 | offset = vaddr & ~PAGE_MASK; | |
609 | end = PAGE_ALIGN(vaddr + size); | |
610 | n_pages = (end - start) >> PAGE_SHIFT; | |
611 | ||
612 | pages = kmalloc(n_pages * sizeof(pages[0]), GFP_KERNEL); | |
613 | if (!pages) { | |
614 | ret = -ENOMEM; | |
615 | pr_err("failed to allocate pages table\n"); | |
616 | goto fail_buf; | |
617 | } | |
618 | ||
619 | /* current->mm->mmap_sem is taken by videobuf2 core */ | |
620 | vma = find_vma(current->mm, vaddr); | |
621 | if (!vma) { | |
622 | pr_err("no vma for address %lu\n", vaddr); | |
623 | ret = -EFAULT; | |
624 | goto fail_pages; | |
625 | } | |
626 | ||
627 | if (vma->vm_end < vaddr + size) { | |
628 | pr_err("vma at %lu is too small for %lu bytes\n", vaddr, size); | |
629 | ret = -EFAULT; | |
630 | goto fail_pages; | |
631 | } | |
632 | ||
633 | buf->vma = vb2_get_vma(vma); | |
634 | if (!buf->vma) { | |
635 | pr_err("failed to copy vma\n"); | |
636 | ret = -ENOMEM; | |
637 | goto fail_pages; | |
638 | } | |
639 | ||
640 | /* extract page list from userspace mapping */ | |
4879785e | 641 | ret = vb2_dc_get_user_pages(start, pages, n_pages, vma, dma_dir); |
1a758d4e | 642 | if (ret) { |
774d2301 MS |
643 | unsigned long pfn; |
644 | if (vb2_dc_get_user_pfn(start, n_pages, vma, &pfn) == 0) { | |
645 | buf->dma_addr = vb2_dc_pfn_to_dma(buf->dev, pfn); | |
646 | buf->size = size; | |
647 | kfree(pages); | |
648 | return buf; | |
649 | } | |
650 | ||
e15dab75 TS |
651 | pr_err("failed to get user pages\n"); |
652 | goto fail_vma; | |
653 | } | |
654 | ||
655 | sgt = kzalloc(sizeof(*sgt), GFP_KERNEL); | |
656 | if (!sgt) { | |
657 | pr_err("failed to allocate sg table\n"); | |
658 | ret = -ENOMEM; | |
659 | goto fail_get_user_pages; | |
660 | } | |
661 | ||
662 | ret = sg_alloc_table_from_pages(sgt, pages, n_pages, | |
663 | offset, size, GFP_KERNEL); | |
664 | if (ret) { | |
665 | pr_err("failed to initialize sg table\n"); | |
666 | goto fail_sgt; | |
667 | } | |
668 | ||
669 | /* pages are no longer needed */ | |
670 | kfree(pages); | |
671 | pages = NULL; | |
672 | ||
251a79f8 HV |
673 | /* |
674 | * No need to sync to the device, this will happen later when the | |
675 | * prepare() memop is called. | |
676 | */ | |
677 | sgt->nents = dma_map_sg_attrs(buf->dev, sgt->sgl, sgt->orig_nents, | |
678 | buf->dma_dir, &attrs); | |
e15dab75 TS |
679 | if (sgt->nents <= 0) { |
680 | pr_err("failed to map scatterlist\n"); | |
681 | ret = -EIO; | |
682 | goto fail_sgt_init; | |
683 | } | |
684 | ||
685 | contig_size = vb2_dc_get_contiguous_size(sgt); | |
686 | if (contig_size < size) { | |
687 | pr_err("contiguous mapping is too small %lu/%lu\n", | |
688 | contig_size, size); | |
689 | ret = -EFAULT; | |
690 | goto fail_map_sg; | |
1a758d4e PO |
691 | } |
692 | ||
e15dab75 | 693 | buf->dma_addr = sg_dma_address(sgt->sgl); |
1a758d4e | 694 | buf->size = size; |
e15dab75 | 695 | buf->dma_sgt = sgt; |
1a758d4e PO |
696 | |
697 | return buf; | |
1a758d4e | 698 | |
e15dab75 | 699 | fail_map_sg: |
251a79f8 HV |
700 | dma_unmap_sg_attrs(buf->dev, sgt->sgl, sgt->orig_nents, |
701 | buf->dma_dir, &attrs); | |
1a758d4e | 702 | |
e15dab75 TS |
703 | fail_sgt_init: |
704 | if (!vma_is_io(buf->vma)) | |
705 | vb2_dc_sgt_foreach_page(sgt, put_page); | |
706 | sg_free_table(sgt); | |
707 | ||
708 | fail_sgt: | |
709 | kfree(sgt); | |
1a758d4e | 710 | |
e15dab75 TS |
711 | fail_get_user_pages: |
712 | if (pages && !vma_is_io(buf->vma)) | |
713 | while (n_pages) | |
714 | put_page(pages[--n_pages]); | |
715 | ||
716 | fail_vma: | |
1a758d4e | 717 | vb2_put_vma(buf->vma); |
e15dab75 TS |
718 | |
719 | fail_pages: | |
720 | kfree(pages); /* kfree is NULL-proof */ | |
721 | ||
722 | fail_buf: | |
1a758d4e | 723 | kfree(buf); |
e15dab75 TS |
724 | |
725 | return ERR_PTR(ret); | |
1a758d4e PO |
726 | } |
727 | ||
8c417d03 SS |
728 | /*********************************************/ |
729 | /* callbacks for DMABUF buffers */ | |
730 | /*********************************************/ | |
731 | ||
732 | static int vb2_dc_map_dmabuf(void *mem_priv) | |
733 | { | |
734 | struct vb2_dc_buf *buf = mem_priv; | |
735 | struct sg_table *sgt; | |
736 | unsigned long contig_size; | |
737 | ||
738 | if (WARN_ON(!buf->db_attach)) { | |
739 | pr_err("trying to pin a non attached buffer\n"); | |
740 | return -EINVAL; | |
741 | } | |
742 | ||
743 | if (WARN_ON(buf->dma_sgt)) { | |
744 | pr_err("dmabuf buffer is already pinned\n"); | |
745 | return 0; | |
746 | } | |
747 | ||
748 | /* get the associated scatterlist for this buffer */ | |
749 | sgt = dma_buf_map_attachment(buf->db_attach, buf->dma_dir); | |
fee0c54e | 750 | if (IS_ERR(sgt)) { |
8c417d03 SS |
751 | pr_err("Error getting dmabuf scatterlist\n"); |
752 | return -EINVAL; | |
753 | } | |
754 | ||
755 | /* checking if dmabuf is big enough to store contiguous chunk */ | |
756 | contig_size = vb2_dc_get_contiguous_size(sgt); | |
757 | if (contig_size < buf->size) { | |
758 | pr_err("contiguous chunk is too small %lu/%lu b\n", | |
759 | contig_size, buf->size); | |
760 | dma_buf_unmap_attachment(buf->db_attach, sgt, buf->dma_dir); | |
761 | return -EFAULT; | |
762 | } | |
763 | ||
764 | buf->dma_addr = sg_dma_address(sgt->sgl); | |
765 | buf->dma_sgt = sgt; | |
6bbd4fec | 766 | buf->vaddr = NULL; |
8c417d03 SS |
767 | |
768 | return 0; | |
769 | } | |
770 | ||
771 | static void vb2_dc_unmap_dmabuf(void *mem_priv) | |
772 | { | |
773 | struct vb2_dc_buf *buf = mem_priv; | |
774 | struct sg_table *sgt = buf->dma_sgt; | |
775 | ||
776 | if (WARN_ON(!buf->db_attach)) { | |
777 | pr_err("trying to unpin a not attached buffer\n"); | |
778 | return; | |
779 | } | |
780 | ||
781 | if (WARN_ON(!sgt)) { | |
782 | pr_err("dmabuf buffer is already unpinned\n"); | |
783 | return; | |
784 | } | |
785 | ||
6bbd4fec PZ |
786 | if (buf->vaddr) { |
787 | dma_buf_vunmap(buf->db_attach->dmabuf, buf->vaddr); | |
788 | buf->vaddr = NULL; | |
789 | } | |
8c417d03 SS |
790 | dma_buf_unmap_attachment(buf->db_attach, sgt, buf->dma_dir); |
791 | ||
792 | buf->dma_addr = 0; | |
793 | buf->dma_sgt = NULL; | |
794 | } | |
795 | ||
796 | static void vb2_dc_detach_dmabuf(void *mem_priv) | |
797 | { | |
798 | struct vb2_dc_buf *buf = mem_priv; | |
799 | ||
800 | /* if vb2 works correctly you should never detach mapped buffer */ | |
801 | if (WARN_ON(buf->dma_addr)) | |
802 | vb2_dc_unmap_dmabuf(buf); | |
803 | ||
804 | /* detach this attachment */ | |
805 | dma_buf_detach(buf->db_attach->dmabuf, buf->db_attach); | |
806 | kfree(buf); | |
807 | } | |
808 | ||
809 | static void *vb2_dc_attach_dmabuf(void *alloc_ctx, struct dma_buf *dbuf, | |
cd474037 | 810 | unsigned long size, enum dma_data_direction dma_dir) |
8c417d03 SS |
811 | { |
812 | struct vb2_dc_conf *conf = alloc_ctx; | |
813 | struct vb2_dc_buf *buf; | |
814 | struct dma_buf_attachment *dba; | |
815 | ||
816 | if (dbuf->size < size) | |
817 | return ERR_PTR(-EFAULT); | |
818 | ||
819 | buf = kzalloc(sizeof(*buf), GFP_KERNEL); | |
820 | if (!buf) | |
821 | return ERR_PTR(-ENOMEM); | |
822 | ||
823 | buf->dev = conf->dev; | |
824 | /* create attachment for the dmabuf with the user device */ | |
825 | dba = dma_buf_attach(dbuf, buf->dev); | |
826 | if (IS_ERR(dba)) { | |
827 | pr_err("failed to attach dmabuf\n"); | |
828 | kfree(buf); | |
829 | return dba; | |
830 | } | |
831 | ||
cd474037 | 832 | buf->dma_dir = dma_dir; |
8c417d03 SS |
833 | buf->size = size; |
834 | buf->db_attach = dba; | |
835 | ||
836 | return buf; | |
837 | } | |
838 | ||
40d8b766 LP |
839 | /*********************************************/ |
840 | /* DMA CONTIG exported functions */ | |
841 | /*********************************************/ | |
842 | ||
1a758d4e | 843 | const struct vb2_mem_ops vb2_dma_contig_memops = { |
f7f129ce LP |
844 | .alloc = vb2_dc_alloc, |
845 | .put = vb2_dc_put, | |
9ef2cbeb | 846 | .get_dmabuf = vb2_dc_get_dmabuf, |
f7f129ce LP |
847 | .cookie = vb2_dc_cookie, |
848 | .vaddr = vb2_dc_vaddr, | |
849 | .mmap = vb2_dc_mmap, | |
850 | .get_userptr = vb2_dc_get_userptr, | |
851 | .put_userptr = vb2_dc_put_userptr, | |
199d101e MS |
852 | .prepare = vb2_dc_prepare, |
853 | .finish = vb2_dc_finish, | |
8c417d03 SS |
854 | .map_dmabuf = vb2_dc_map_dmabuf, |
855 | .unmap_dmabuf = vb2_dc_unmap_dmabuf, | |
856 | .attach_dmabuf = vb2_dc_attach_dmabuf, | |
857 | .detach_dmabuf = vb2_dc_detach_dmabuf, | |
f7f129ce | 858 | .num_users = vb2_dc_num_users, |
1a758d4e PO |
859 | }; |
860 | EXPORT_SYMBOL_GPL(vb2_dma_contig_memops); | |
861 | ||
862 | void *vb2_dma_contig_init_ctx(struct device *dev) | |
863 | { | |
864 | struct vb2_dc_conf *conf; | |
865 | ||
866 | conf = kzalloc(sizeof *conf, GFP_KERNEL); | |
867 | if (!conf) | |
868 | return ERR_PTR(-ENOMEM); | |
869 | ||
870 | conf->dev = dev; | |
871 | ||
872 | return conf; | |
873 | } | |
874 | EXPORT_SYMBOL_GPL(vb2_dma_contig_init_ctx); | |
875 | ||
876 | void vb2_dma_contig_cleanup_ctx(void *alloc_ctx) | |
877 | { | |
e5ae8fa7 HV |
878 | if (!IS_ERR_OR_NULL(alloc_ctx)) |
879 | kfree(alloc_ctx); | |
1a758d4e PO |
880 | } |
881 | EXPORT_SYMBOL_GPL(vb2_dma_contig_cleanup_ctx); | |
882 | ||
883 | MODULE_DESCRIPTION("DMA-contig memory handling routines for videobuf2"); | |
95072084 | 884 | MODULE_AUTHOR("Pawel Osciak <pawel@osciak.com>"); |
1a758d4e | 885 | MODULE_LICENSE("GPL"); |