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 | ||
c139990e | 20 | #include <media/videobuf2-v4l2.h> |
d0df3c38 | 21 | #include <media/videobuf2-dma-contig.h> |
1a758d4e PO |
22 | #include <media/videobuf2-memops.h> |
23 | ||
1a758d4e | 24 | struct vb2_dc_buf { |
72f86bff | 25 | struct device *dev; |
1a758d4e | 26 | void *vaddr; |
1a758d4e | 27 | unsigned long size; |
ccc66e73 | 28 | void *cookie; |
40d8b766 | 29 | dma_addr_t dma_addr; |
00085f1e | 30 | unsigned long attrs; |
e15dab75 TS |
31 | enum dma_data_direction dma_dir; |
32 | struct sg_table *dma_sgt; | |
fb639eb3 | 33 | struct frame_vector *vec; |
40d8b766 LP |
34 | |
35 | /* MMAP related */ | |
1a758d4e | 36 | struct vb2_vmarea_handler handler; |
40d8b766 | 37 | atomic_t refcount; |
9ef2cbeb | 38 | struct sg_table *sgt_base; |
40d8b766 | 39 | |
8c417d03 SS |
40 | /* DMABUF related */ |
41 | struct dma_buf_attachment *db_attach; | |
1a758d4e PO |
42 | }; |
43 | ||
e15dab75 TS |
44 | /*********************************************/ |
45 | /* scatterlist table functions */ | |
46 | /*********************************************/ | |
47 | ||
e15dab75 TS |
48 | static unsigned long vb2_dc_get_contiguous_size(struct sg_table *sgt) |
49 | { | |
50 | struct scatterlist *s; | |
51 | dma_addr_t expected = sg_dma_address(sgt->sgl); | |
52 | unsigned int i; | |
53 | unsigned long size = 0; | |
54 | ||
55 | for_each_sg(sgt->sgl, s, sgt->nents, i) { | |
56 | if (sg_dma_address(s) != expected) | |
57 | break; | |
58 | expected = sg_dma_address(s) + sg_dma_len(s); | |
59 | size += sg_dma_len(s); | |
60 | } | |
61 | return size; | |
62 | } | |
63 | ||
40d8b766 LP |
64 | /*********************************************/ |
65 | /* callbacks for all buffers */ | |
66 | /*********************************************/ | |
67 | ||
68 | static void *vb2_dc_cookie(void *buf_priv) | |
69 | { | |
70 | struct vb2_dc_buf *buf = buf_priv; | |
71 | ||
72 | return &buf->dma_addr; | |
73 | } | |
74 | ||
75 | static void *vb2_dc_vaddr(void *buf_priv) | |
76 | { | |
77 | struct vb2_dc_buf *buf = buf_priv; | |
78 | ||
6bbd4fec PZ |
79 | if (!buf->vaddr && buf->db_attach) |
80 | buf->vaddr = dma_buf_vmap(buf->db_attach->dmabuf); | |
81 | ||
40d8b766 LP |
82 | return buf->vaddr; |
83 | } | |
84 | ||
85 | static unsigned int vb2_dc_num_users(void *buf_priv) | |
86 | { | |
87 | struct vb2_dc_buf *buf = buf_priv; | |
88 | ||
89 | return atomic_read(&buf->refcount); | |
90 | } | |
91 | ||
199d101e MS |
92 | static void vb2_dc_prepare(void *buf_priv) |
93 | { | |
94 | struct vb2_dc_buf *buf = buf_priv; | |
95 | struct sg_table *sgt = buf->dma_sgt; | |
96 | ||
8c417d03 SS |
97 | /* DMABUF exporter will flush the cache for us */ |
98 | if (!sgt || buf->db_attach) | |
199d101e MS |
99 | return; |
100 | ||
d9a98588 TL |
101 | dma_sync_sg_for_device(buf->dev, sgt->sgl, sgt->orig_nents, |
102 | buf->dma_dir); | |
199d101e MS |
103 | } |
104 | ||
105 | static void vb2_dc_finish(void *buf_priv) | |
106 | { | |
107 | struct vb2_dc_buf *buf = buf_priv; | |
108 | struct sg_table *sgt = buf->dma_sgt; | |
109 | ||
8c417d03 SS |
110 | /* DMABUF exporter will flush the cache for us */ |
111 | if (!sgt || buf->db_attach) | |
199d101e MS |
112 | return; |
113 | ||
d9a98588 | 114 | dma_sync_sg_for_cpu(buf->dev, sgt->sgl, sgt->orig_nents, buf->dma_dir); |
199d101e MS |
115 | } |
116 | ||
40d8b766 LP |
117 | /*********************************************/ |
118 | /* callbacks for MMAP buffers */ | |
119 | /*********************************************/ | |
120 | ||
121 | static void vb2_dc_put(void *buf_priv) | |
122 | { | |
123 | struct vb2_dc_buf *buf = buf_priv; | |
124 | ||
125 | if (!atomic_dec_and_test(&buf->refcount)) | |
126 | return; | |
127 | ||
9ef2cbeb TS |
128 | if (buf->sgt_base) { |
129 | sg_free_table(buf->sgt_base); | |
130 | kfree(buf->sgt_base); | |
131 | } | |
ccc66e73 | 132 | dma_free_attrs(buf->dev, buf->size, buf->cookie, buf->dma_addr, |
00085f1e | 133 | buf->attrs); |
67a5d0ce | 134 | put_device(buf->dev); |
40d8b766 LP |
135 | kfree(buf); |
136 | } | |
1a758d4e | 137 | |
00085f1e | 138 | static void *vb2_dc_alloc(struct device *dev, unsigned long attrs, |
d16e832d HV |
139 | unsigned long size, enum dma_data_direction dma_dir, |
140 | gfp_t gfp_flags) | |
1a758d4e | 141 | { |
1a758d4e PO |
142 | struct vb2_dc_buf *buf; |
143 | ||
144 | buf = kzalloc(sizeof *buf, GFP_KERNEL); | |
145 | if (!buf) | |
146 | return ERR_PTR(-ENOMEM); | |
147 | ||
d16e832d | 148 | if (attrs) |
00085f1e | 149 | buf->attrs = attrs; |
ccc66e73 | 150 | buf->cookie = dma_alloc_attrs(dev, size, &buf->dma_addr, |
00085f1e | 151 | GFP_KERNEL | gfp_flags, buf->attrs); |
ccc66e73 | 152 | if (!buf->cookie) { |
72f86bff | 153 | dev_err(dev, "dma_alloc_coherent of size %ld failed\n", size); |
1a758d4e PO |
154 | kfree(buf); |
155 | return ERR_PTR(-ENOMEM); | |
156 | } | |
157 | ||
00085f1e | 158 | if ((buf->attrs & DMA_ATTR_NO_KERNEL_MAPPING) == 0) |
ccc66e73 TF |
159 | buf->vaddr = buf->cookie; |
160 | ||
67a5d0ce TS |
161 | /* Prevent the device from being released while the buffer is used */ |
162 | buf->dev = get_device(dev); | |
1a758d4e | 163 | buf->size = size; |
d935c57e | 164 | buf->dma_dir = dma_dir; |
1a758d4e PO |
165 | |
166 | buf->handler.refcount = &buf->refcount; | |
f7f129ce | 167 | buf->handler.put = vb2_dc_put; |
1a758d4e PO |
168 | buf->handler.arg = buf; |
169 | ||
170 | atomic_inc(&buf->refcount); | |
171 | ||
172 | return buf; | |
173 | } | |
174 | ||
f7f129ce | 175 | static int vb2_dc_mmap(void *buf_priv, struct vm_area_struct *vma) |
1a758d4e PO |
176 | { |
177 | struct vb2_dc_buf *buf = buf_priv; | |
c60520fa | 178 | int ret; |
1a758d4e PO |
179 | |
180 | if (!buf) { | |
181 | printk(KERN_ERR "No buffer to map\n"); | |
182 | return -EINVAL; | |
183 | } | |
184 | ||
c60520fa MS |
185 | /* |
186 | * dma_mmap_* uses vm_pgoff as in-buffer offset, but we want to | |
187 | * map whole buffer | |
188 | */ | |
189 | vma->vm_pgoff = 0; | |
190 | ||
ccc66e73 | 191 | ret = dma_mmap_attrs(buf->dev, vma, buf->cookie, |
00085f1e | 192 | buf->dma_addr, buf->size, buf->attrs); |
c60520fa MS |
193 | |
194 | if (ret) { | |
195 | pr_err("Remapping memory failed, error: %d\n", ret); | |
196 | return ret; | |
197 | } | |
198 | ||
199 | vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; | |
200 | vma->vm_private_data = &buf->handler; | |
201 | vma->vm_ops = &vb2_common_vm_ops; | |
202 | ||
203 | vma->vm_ops->open(vma); | |
204 | ||
205 | pr_debug("%s: mapped dma addr 0x%08lx at 0x%08lx, size %ld\n", | |
206 | __func__, (unsigned long)buf->dma_addr, vma->vm_start, | |
207 | buf->size); | |
208 | ||
209 | return 0; | |
1a758d4e PO |
210 | } |
211 | ||
9ef2cbeb TS |
212 | /*********************************************/ |
213 | /* DMABUF ops for exporters */ | |
214 | /*********************************************/ | |
215 | ||
216 | struct vb2_dc_attachment { | |
217 | struct sg_table sgt; | |
cd474037 | 218 | enum dma_data_direction dma_dir; |
9ef2cbeb TS |
219 | }; |
220 | ||
221 | static int vb2_dc_dmabuf_ops_attach(struct dma_buf *dbuf, struct device *dev, | |
222 | struct dma_buf_attachment *dbuf_attach) | |
223 | { | |
224 | struct vb2_dc_attachment *attach; | |
225 | unsigned int i; | |
226 | struct scatterlist *rd, *wr; | |
227 | struct sg_table *sgt; | |
228 | struct vb2_dc_buf *buf = dbuf->priv; | |
229 | int ret; | |
230 | ||
231 | attach = kzalloc(sizeof(*attach), GFP_KERNEL); | |
232 | if (!attach) | |
233 | return -ENOMEM; | |
234 | ||
235 | sgt = &attach->sgt; | |
236 | /* Copy the buf->base_sgt scatter list to the attachment, as we can't | |
237 | * map the same scatter list to multiple attachments at the same time. | |
238 | */ | |
239 | ret = sg_alloc_table(sgt, buf->sgt_base->orig_nents, GFP_KERNEL); | |
240 | if (ret) { | |
241 | kfree(attach); | |
242 | return -ENOMEM; | |
243 | } | |
244 | ||
245 | rd = buf->sgt_base->sgl; | |
246 | wr = sgt->sgl; | |
247 | for (i = 0; i < sgt->orig_nents; ++i) { | |
248 | sg_set_page(wr, sg_page(rd), rd->length, rd->offset); | |
249 | rd = sg_next(rd); | |
250 | wr = sg_next(wr); | |
251 | } | |
252 | ||
cd474037 | 253 | attach->dma_dir = DMA_NONE; |
9ef2cbeb TS |
254 | dbuf_attach->priv = attach; |
255 | ||
256 | return 0; | |
257 | } | |
258 | ||
259 | static void vb2_dc_dmabuf_ops_detach(struct dma_buf *dbuf, | |
260 | struct dma_buf_attachment *db_attach) | |
261 | { | |
262 | struct vb2_dc_attachment *attach = db_attach->priv; | |
263 | struct sg_table *sgt; | |
264 | ||
265 | if (!attach) | |
266 | return; | |
267 | ||
268 | sgt = &attach->sgt; | |
269 | ||
270 | /* release the scatterlist cache */ | |
cd474037 | 271 | if (attach->dma_dir != DMA_NONE) |
9ef2cbeb | 272 | dma_unmap_sg(db_attach->dev, sgt->sgl, sgt->orig_nents, |
cd474037 | 273 | attach->dma_dir); |
9ef2cbeb TS |
274 | sg_free_table(sgt); |
275 | kfree(attach); | |
276 | db_attach->priv = NULL; | |
277 | } | |
278 | ||
279 | static struct sg_table *vb2_dc_dmabuf_ops_map( | |
cd474037 | 280 | struct dma_buf_attachment *db_attach, enum dma_data_direction dma_dir) |
9ef2cbeb TS |
281 | { |
282 | struct vb2_dc_attachment *attach = db_attach->priv; | |
283 | /* stealing dmabuf mutex to serialize map/unmap operations */ | |
284 | struct mutex *lock = &db_attach->dmabuf->lock; | |
285 | struct sg_table *sgt; | |
9ef2cbeb TS |
286 | |
287 | mutex_lock(lock); | |
288 | ||
289 | sgt = &attach->sgt; | |
290 | /* return previously mapped sg table */ | |
cd474037 | 291 | if (attach->dma_dir == dma_dir) { |
9ef2cbeb TS |
292 | mutex_unlock(lock); |
293 | return sgt; | |
294 | } | |
295 | ||
296 | /* release any previous cache */ | |
cd474037 | 297 | if (attach->dma_dir != DMA_NONE) { |
9ef2cbeb | 298 | dma_unmap_sg(db_attach->dev, sgt->sgl, sgt->orig_nents, |
cd474037 HV |
299 | attach->dma_dir); |
300 | attach->dma_dir = DMA_NONE; | |
9ef2cbeb TS |
301 | } |
302 | ||
303 | /* mapping to the client with new direction */ | |
60a47192 RR |
304 | sgt->nents = dma_map_sg(db_attach->dev, sgt->sgl, sgt->orig_nents, |
305 | dma_dir); | |
306 | if (!sgt->nents) { | |
9ef2cbeb TS |
307 | pr_err("failed to map scatterlist\n"); |
308 | mutex_unlock(lock); | |
309 | return ERR_PTR(-EIO); | |
310 | } | |
311 | ||
cd474037 | 312 | attach->dma_dir = dma_dir; |
9ef2cbeb TS |
313 | |
314 | mutex_unlock(lock); | |
315 | ||
316 | return sgt; | |
317 | } | |
318 | ||
319 | static void vb2_dc_dmabuf_ops_unmap(struct dma_buf_attachment *db_attach, | |
cd474037 | 320 | struct sg_table *sgt, enum dma_data_direction dma_dir) |
9ef2cbeb TS |
321 | { |
322 | /* nothing to be done here */ | |
323 | } | |
324 | ||
325 | static void vb2_dc_dmabuf_ops_release(struct dma_buf *dbuf) | |
326 | { | |
327 | /* drop reference obtained in vb2_dc_get_dmabuf */ | |
328 | vb2_dc_put(dbuf->priv); | |
329 | } | |
330 | ||
331 | static void *vb2_dc_dmabuf_ops_kmap(struct dma_buf *dbuf, unsigned long pgnum) | |
332 | { | |
333 | struct vb2_dc_buf *buf = dbuf->priv; | |
334 | ||
ccc66e73 | 335 | return buf->vaddr ? buf->vaddr + pgnum * PAGE_SIZE : NULL; |
9ef2cbeb TS |
336 | } |
337 | ||
338 | static void *vb2_dc_dmabuf_ops_vmap(struct dma_buf *dbuf) | |
339 | { | |
340 | struct vb2_dc_buf *buf = dbuf->priv; | |
341 | ||
342 | return buf->vaddr; | |
343 | } | |
344 | ||
345 | static int vb2_dc_dmabuf_ops_mmap(struct dma_buf *dbuf, | |
346 | struct vm_area_struct *vma) | |
347 | { | |
348 | return vb2_dc_mmap(dbuf->priv, vma); | |
349 | } | |
350 | ||
351 | static struct dma_buf_ops vb2_dc_dmabuf_ops = { | |
352 | .attach = vb2_dc_dmabuf_ops_attach, | |
353 | .detach = vb2_dc_dmabuf_ops_detach, | |
354 | .map_dma_buf = vb2_dc_dmabuf_ops_map, | |
355 | .unmap_dma_buf = vb2_dc_dmabuf_ops_unmap, | |
356 | .kmap = vb2_dc_dmabuf_ops_kmap, | |
357 | .kmap_atomic = vb2_dc_dmabuf_ops_kmap, | |
358 | .vmap = vb2_dc_dmabuf_ops_vmap, | |
359 | .mmap = vb2_dc_dmabuf_ops_mmap, | |
360 | .release = vb2_dc_dmabuf_ops_release, | |
361 | }; | |
362 | ||
363 | static struct sg_table *vb2_dc_get_base_sgt(struct vb2_dc_buf *buf) | |
364 | { | |
365 | int ret; | |
366 | struct sg_table *sgt; | |
367 | ||
368 | sgt = kmalloc(sizeof(*sgt), GFP_KERNEL); | |
369 | if (!sgt) { | |
370 | dev_err(buf->dev, "failed to alloc sg table\n"); | |
371 | return NULL; | |
372 | } | |
373 | ||
ccc66e73 | 374 | ret = dma_get_sgtable_attrs(buf->dev, sgt, buf->cookie, buf->dma_addr, |
00085f1e | 375 | buf->size, buf->attrs); |
9ef2cbeb TS |
376 | if (ret < 0) { |
377 | dev_err(buf->dev, "failed to get scatterlist from DMA API\n"); | |
378 | kfree(sgt); | |
379 | return NULL; | |
380 | } | |
381 | ||
382 | return sgt; | |
383 | } | |
384 | ||
c1b96a23 | 385 | static struct dma_buf *vb2_dc_get_dmabuf(void *buf_priv, unsigned long flags) |
9ef2cbeb TS |
386 | { |
387 | struct vb2_dc_buf *buf = buf_priv; | |
388 | struct dma_buf *dbuf; | |
d8fbe341 SS |
389 | DEFINE_DMA_BUF_EXPORT_INFO(exp_info); |
390 | ||
391 | exp_info.ops = &vb2_dc_dmabuf_ops; | |
392 | exp_info.size = buf->size; | |
393 | exp_info.flags = flags; | |
394 | exp_info.priv = buf; | |
9ef2cbeb TS |
395 | |
396 | if (!buf->sgt_base) | |
397 | buf->sgt_base = vb2_dc_get_base_sgt(buf); | |
398 | ||
399 | if (WARN_ON(!buf->sgt_base)) | |
400 | return NULL; | |
401 | ||
d8fbe341 | 402 | dbuf = dma_buf_export(&exp_info); |
9ef2cbeb TS |
403 | if (IS_ERR(dbuf)) |
404 | return NULL; | |
405 | ||
406 | /* dmabuf keeps reference to vb2 buffer */ | |
407 | atomic_inc(&buf->refcount); | |
408 | ||
409 | return dbuf; | |
410 | } | |
411 | ||
40d8b766 LP |
412 | /*********************************************/ |
413 | /* callbacks for USERPTR buffers */ | |
414 | /*********************************************/ | |
415 | ||
e15dab75 TS |
416 | static void vb2_dc_put_userptr(void *buf_priv) |
417 | { | |
418 | struct vb2_dc_buf *buf = buf_priv; | |
419 | struct sg_table *sgt = buf->dma_sgt; | |
fb639eb3 JK |
420 | int i; |
421 | struct page **pages; | |
e15dab75 | 422 | |
774d2301 | 423 | if (sgt) { |
251a79f8 HV |
424 | /* |
425 | * No need to sync to CPU, it's already synced to the CPU | |
426 | * since the finish() memop will have been called before this. | |
427 | */ | |
428 | dma_unmap_sg_attrs(buf->dev, sgt->sgl, sgt->orig_nents, | |
00085f1e | 429 | buf->dma_dir, DMA_ATTR_SKIP_CPU_SYNC); |
fb639eb3 JK |
430 | pages = frame_vector_pages(buf->vec); |
431 | /* sgt should exist only if vector contains pages... */ | |
432 | BUG_ON(IS_ERR(pages)); | |
433 | for (i = 0; i < frame_vector_count(buf->vec); i++) | |
434 | set_page_dirty_lock(pages[i]); | |
774d2301 MS |
435 | sg_free_table(sgt); |
436 | kfree(sgt); | |
437 | } | |
fb639eb3 | 438 | vb2_destroy_framevec(buf->vec); |
e15dab75 TS |
439 | kfree(buf); |
440 | } | |
441 | ||
774d2301 MS |
442 | /* |
443 | * For some kind of reserved memory there might be no struct page available, | |
444 | * so all that can be done to support such 'pages' is to try to convert | |
445 | * pfn to dma address or at the last resort just assume that | |
446 | * dma address == physical address (like it has been assumed in earlier version | |
447 | * of videobuf2-dma-contig | |
448 | */ | |
449 | ||
450 | #ifdef __arch_pfn_to_dma | |
451 | static inline dma_addr_t vb2_dc_pfn_to_dma(struct device *dev, unsigned long pfn) | |
452 | { | |
453 | return (dma_addr_t)__arch_pfn_to_dma(dev, pfn); | |
454 | } | |
455 | #elif defined(__pfn_to_bus) | |
456 | static inline dma_addr_t vb2_dc_pfn_to_dma(struct device *dev, unsigned long pfn) | |
457 | { | |
458 | return (dma_addr_t)__pfn_to_bus(pfn); | |
459 | } | |
460 | #elif defined(__pfn_to_phys) | |
461 | static inline dma_addr_t vb2_dc_pfn_to_dma(struct device *dev, unsigned long pfn) | |
462 | { | |
463 | return (dma_addr_t)__pfn_to_phys(pfn); | |
464 | } | |
465 | #else | |
466 | static inline dma_addr_t vb2_dc_pfn_to_dma(struct device *dev, unsigned long pfn) | |
467 | { | |
468 | /* really, we cannot do anything better at this point */ | |
469 | return (dma_addr_t)(pfn) << PAGE_SHIFT; | |
470 | } | |
471 | #endif | |
472 | ||
36c0f8b3 | 473 | static void *vb2_dc_get_userptr(struct device *dev, unsigned long vaddr, |
cd474037 | 474 | unsigned long size, enum dma_data_direction dma_dir) |
1a758d4e PO |
475 | { |
476 | struct vb2_dc_buf *buf; | |
fb639eb3 | 477 | struct frame_vector *vec; |
e15dab75 | 478 | unsigned long offset; |
fb639eb3 | 479 | int n_pages, i; |
e15dab75 | 480 | int ret = 0; |
e15dab75 TS |
481 | struct sg_table *sgt; |
482 | unsigned long contig_size; | |
d81e870d MS |
483 | unsigned long dma_align = dma_get_cache_alignment(); |
484 | ||
485 | /* Only cache aligned DMA transfers are reliable */ | |
486 | if (!IS_ALIGNED(vaddr | size, dma_align)) { | |
487 | pr_debug("user data must be aligned to %lu bytes\n", dma_align); | |
488 | return ERR_PTR(-EINVAL); | |
489 | } | |
490 | ||
491 | if (!size) { | |
492 | pr_debug("size is zero\n"); | |
493 | return ERR_PTR(-EINVAL); | |
494 | } | |
1a758d4e PO |
495 | |
496 | buf = kzalloc(sizeof *buf, GFP_KERNEL); | |
497 | if (!buf) | |
498 | return ERR_PTR(-ENOMEM); | |
499 | ||
36c0f8b3 | 500 | buf->dev = dev; |
cd474037 | 501 | buf->dma_dir = dma_dir; |
e15dab75 | 502 | |
e15dab75 | 503 | offset = vaddr & ~PAGE_MASK; |
fb639eb3 JK |
504 | vec = vb2_create_framevec(vaddr, size, dma_dir == DMA_FROM_DEVICE); |
505 | if (IS_ERR(vec)) { | |
506 | ret = PTR_ERR(vec); | |
e15dab75 TS |
507 | goto fail_buf; |
508 | } | |
fb639eb3 JK |
509 | buf->vec = vec; |
510 | n_pages = frame_vector_count(vec); | |
511 | ret = frame_vector_to_pages(vec); | |
512 | if (ret < 0) { | |
513 | unsigned long *nums = frame_vector_pfns(vec); | |
e15dab75 | 514 | |
fb639eb3 JK |
515 | /* |
516 | * Failed to convert to pages... Check the memory is physically | |
517 | * contiguous and use direct mapping | |
518 | */ | |
519 | for (i = 1; i < n_pages; i++) | |
520 | if (nums[i-1] + 1 != nums[i]) | |
521 | goto fail_pfnvec; | |
522 | buf->dma_addr = vb2_dc_pfn_to_dma(buf->dev, nums[0]); | |
523 | goto out; | |
e15dab75 TS |
524 | } |
525 | ||
526 | sgt = kzalloc(sizeof(*sgt), GFP_KERNEL); | |
527 | if (!sgt) { | |
528 | pr_err("failed to allocate sg table\n"); | |
529 | ret = -ENOMEM; | |
fb639eb3 | 530 | goto fail_pfnvec; |
e15dab75 TS |
531 | } |
532 | ||
fb639eb3 | 533 | ret = sg_alloc_table_from_pages(sgt, frame_vector_pages(vec), n_pages, |
e15dab75 TS |
534 | offset, size, GFP_KERNEL); |
535 | if (ret) { | |
536 | pr_err("failed to initialize sg table\n"); | |
537 | goto fail_sgt; | |
538 | } | |
539 | ||
251a79f8 HV |
540 | /* |
541 | * No need to sync to the device, this will happen later when the | |
542 | * prepare() memop is called. | |
543 | */ | |
544 | sgt->nents = dma_map_sg_attrs(buf->dev, sgt->sgl, sgt->orig_nents, | |
00085f1e | 545 | buf->dma_dir, DMA_ATTR_SKIP_CPU_SYNC); |
e15dab75 TS |
546 | if (sgt->nents <= 0) { |
547 | pr_err("failed to map scatterlist\n"); | |
548 | ret = -EIO; | |
549 | goto fail_sgt_init; | |
550 | } | |
551 | ||
552 | contig_size = vb2_dc_get_contiguous_size(sgt); | |
553 | if (contig_size < size) { | |
554 | pr_err("contiguous mapping is too small %lu/%lu\n", | |
555 | contig_size, size); | |
556 | ret = -EFAULT; | |
557 | goto fail_map_sg; | |
1a758d4e PO |
558 | } |
559 | ||
e15dab75 | 560 | buf->dma_addr = sg_dma_address(sgt->sgl); |
e15dab75 | 561 | buf->dma_sgt = sgt; |
fb639eb3 JK |
562 | out: |
563 | buf->size = size; | |
1a758d4e PO |
564 | |
565 | return buf; | |
1a758d4e | 566 | |
e15dab75 | 567 | fail_map_sg: |
251a79f8 | 568 | dma_unmap_sg_attrs(buf->dev, sgt->sgl, sgt->orig_nents, |
00085f1e | 569 | buf->dma_dir, DMA_ATTR_SKIP_CPU_SYNC); |
1a758d4e | 570 | |
e15dab75 | 571 | fail_sgt_init: |
e15dab75 TS |
572 | sg_free_table(sgt); |
573 | ||
574 | fail_sgt: | |
575 | kfree(sgt); | |
1a758d4e | 576 | |
fb639eb3 JK |
577 | fail_pfnvec: |
578 | vb2_destroy_framevec(vec); | |
e15dab75 TS |
579 | |
580 | fail_buf: | |
1a758d4e | 581 | kfree(buf); |
e15dab75 TS |
582 | |
583 | return ERR_PTR(ret); | |
1a758d4e PO |
584 | } |
585 | ||
8c417d03 SS |
586 | /*********************************************/ |
587 | /* callbacks for DMABUF buffers */ | |
588 | /*********************************************/ | |
589 | ||
590 | static int vb2_dc_map_dmabuf(void *mem_priv) | |
591 | { | |
592 | struct vb2_dc_buf *buf = mem_priv; | |
593 | struct sg_table *sgt; | |
594 | unsigned long contig_size; | |
595 | ||
596 | if (WARN_ON(!buf->db_attach)) { | |
597 | pr_err("trying to pin a non attached buffer\n"); | |
598 | return -EINVAL; | |
599 | } | |
600 | ||
601 | if (WARN_ON(buf->dma_sgt)) { | |
602 | pr_err("dmabuf buffer is already pinned\n"); | |
603 | return 0; | |
604 | } | |
605 | ||
606 | /* get the associated scatterlist for this buffer */ | |
607 | sgt = dma_buf_map_attachment(buf->db_attach, buf->dma_dir); | |
fee0c54e | 608 | if (IS_ERR(sgt)) { |
8c417d03 SS |
609 | pr_err("Error getting dmabuf scatterlist\n"); |
610 | return -EINVAL; | |
611 | } | |
612 | ||
613 | /* checking if dmabuf is big enough to store contiguous chunk */ | |
614 | contig_size = vb2_dc_get_contiguous_size(sgt); | |
615 | if (contig_size < buf->size) { | |
616 | pr_err("contiguous chunk is too small %lu/%lu b\n", | |
617 | contig_size, buf->size); | |
618 | dma_buf_unmap_attachment(buf->db_attach, sgt, buf->dma_dir); | |
619 | return -EFAULT; | |
620 | } | |
621 | ||
622 | buf->dma_addr = sg_dma_address(sgt->sgl); | |
623 | buf->dma_sgt = sgt; | |
6bbd4fec | 624 | buf->vaddr = NULL; |
8c417d03 SS |
625 | |
626 | return 0; | |
627 | } | |
628 | ||
629 | static void vb2_dc_unmap_dmabuf(void *mem_priv) | |
630 | { | |
631 | struct vb2_dc_buf *buf = mem_priv; | |
632 | struct sg_table *sgt = buf->dma_sgt; | |
633 | ||
634 | if (WARN_ON(!buf->db_attach)) { | |
635 | pr_err("trying to unpin a not attached buffer\n"); | |
636 | return; | |
637 | } | |
638 | ||
639 | if (WARN_ON(!sgt)) { | |
640 | pr_err("dmabuf buffer is already unpinned\n"); | |
641 | return; | |
642 | } | |
643 | ||
6bbd4fec PZ |
644 | if (buf->vaddr) { |
645 | dma_buf_vunmap(buf->db_attach->dmabuf, buf->vaddr); | |
646 | buf->vaddr = NULL; | |
647 | } | |
8c417d03 SS |
648 | dma_buf_unmap_attachment(buf->db_attach, sgt, buf->dma_dir); |
649 | ||
650 | buf->dma_addr = 0; | |
651 | buf->dma_sgt = NULL; | |
652 | } | |
653 | ||
654 | static void vb2_dc_detach_dmabuf(void *mem_priv) | |
655 | { | |
656 | struct vb2_dc_buf *buf = mem_priv; | |
657 | ||
658 | /* if vb2 works correctly you should never detach mapped buffer */ | |
659 | if (WARN_ON(buf->dma_addr)) | |
660 | vb2_dc_unmap_dmabuf(buf); | |
661 | ||
662 | /* detach this attachment */ | |
663 | dma_buf_detach(buf->db_attach->dmabuf, buf->db_attach); | |
664 | kfree(buf); | |
665 | } | |
666 | ||
36c0f8b3 | 667 | static void *vb2_dc_attach_dmabuf(struct device *dev, struct dma_buf *dbuf, |
cd474037 | 668 | unsigned long size, enum dma_data_direction dma_dir) |
8c417d03 | 669 | { |
8c417d03 SS |
670 | struct vb2_dc_buf *buf; |
671 | struct dma_buf_attachment *dba; | |
672 | ||
673 | if (dbuf->size < size) | |
674 | return ERR_PTR(-EFAULT); | |
675 | ||
676 | buf = kzalloc(sizeof(*buf), GFP_KERNEL); | |
677 | if (!buf) | |
678 | return ERR_PTR(-ENOMEM); | |
679 | ||
36c0f8b3 | 680 | buf->dev = dev; |
8c417d03 SS |
681 | /* create attachment for the dmabuf with the user device */ |
682 | dba = dma_buf_attach(dbuf, buf->dev); | |
683 | if (IS_ERR(dba)) { | |
684 | pr_err("failed to attach dmabuf\n"); | |
685 | kfree(buf); | |
686 | return dba; | |
687 | } | |
688 | ||
cd474037 | 689 | buf->dma_dir = dma_dir; |
8c417d03 SS |
690 | buf->size = size; |
691 | buf->db_attach = dba; | |
692 | ||
693 | return buf; | |
694 | } | |
695 | ||
40d8b766 LP |
696 | /*********************************************/ |
697 | /* DMA CONTIG exported functions */ | |
698 | /*********************************************/ | |
699 | ||
1a758d4e | 700 | const struct vb2_mem_ops vb2_dma_contig_memops = { |
f7f129ce LP |
701 | .alloc = vb2_dc_alloc, |
702 | .put = vb2_dc_put, | |
9ef2cbeb | 703 | .get_dmabuf = vb2_dc_get_dmabuf, |
f7f129ce LP |
704 | .cookie = vb2_dc_cookie, |
705 | .vaddr = vb2_dc_vaddr, | |
706 | .mmap = vb2_dc_mmap, | |
707 | .get_userptr = vb2_dc_get_userptr, | |
708 | .put_userptr = vb2_dc_put_userptr, | |
199d101e MS |
709 | .prepare = vb2_dc_prepare, |
710 | .finish = vb2_dc_finish, | |
8c417d03 SS |
711 | .map_dmabuf = vb2_dc_map_dmabuf, |
712 | .unmap_dmabuf = vb2_dc_unmap_dmabuf, | |
713 | .attach_dmabuf = vb2_dc_attach_dmabuf, | |
714 | .detach_dmabuf = vb2_dc_detach_dmabuf, | |
f7f129ce | 715 | .num_users = vb2_dc_num_users, |
1a758d4e PO |
716 | }; |
717 | EXPORT_SYMBOL_GPL(vb2_dma_contig_memops); | |
718 | ||
3f033969 MS |
719 | /** |
720 | * vb2_dma_contig_set_max_seg_size() - configure DMA max segment size | |
721 | * @dev: device for configuring DMA parameters | |
722 | * @size: size of DMA max segment size to set | |
723 | * | |
724 | * To allow mapping the scatter-list into a single chunk in the DMA | |
725 | * address space, the device is required to have the DMA max segment | |
726 | * size parameter set to a value larger than the buffer size. Otherwise, | |
727 | * the DMA-mapping subsystem will split the mapping into max segment | |
728 | * size chunks. This function sets the DMA max segment size | |
729 | * parameter to let DMA-mapping map a buffer as a single chunk in DMA | |
730 | * address space. | |
731 | * This code assumes that the DMA-mapping subsystem will merge all | |
732 | * scatterlist segments if this is really possible (for example when | |
733 | * an IOMMU is available and enabled). | |
734 | * Ideally, this parameter should be set by the generic bus code, but it | |
735 | * is left with the default 64KiB value due to historical litmiations in | |
736 | * other subsystems (like limited USB host drivers) and there no good | |
737 | * place to set it to the proper value. | |
738 | * This function should be called from the drivers, which are known to | |
739 | * operate on platforms with IOMMU and provide access to shared buffers | |
740 | * (either USERPTR or DMABUF). This should be done before initializing | |
741 | * videobuf2 queue. | |
742 | */ | |
743 | int vb2_dma_contig_set_max_seg_size(struct device *dev, unsigned int size) | |
744 | { | |
745 | if (!dev->dma_parms) { | |
6cb164f5 | 746 | dev->dma_parms = kzalloc(sizeof(*dev->dma_parms), GFP_KERNEL); |
3f033969 MS |
747 | if (!dev->dma_parms) |
748 | return -ENOMEM; | |
749 | } | |
750 | if (dma_get_max_seg_size(dev) < size) | |
751 | return dma_set_max_seg_size(dev, size); | |
752 | ||
753 | return 0; | |
754 | } | |
755 | EXPORT_SYMBOL_GPL(vb2_dma_contig_set_max_seg_size); | |
756 | ||
757 | /* | |
758 | * vb2_dma_contig_clear_max_seg_size() - release resources for DMA parameters | |
759 | * @dev: device for configuring DMA parameters | |
760 | * | |
761 | * This function releases resources allocated to configure DMA parameters | |
762 | * (see vb2_dma_contig_set_max_seg_size() function). It should be called from | |
763 | * device drivers on driver remove. | |
764 | */ | |
765 | void vb2_dma_contig_clear_max_seg_size(struct device *dev) | |
766 | { | |
767 | kfree(dev->dma_parms); | |
768 | dev->dma_parms = NULL; | |
769 | } | |
770 | EXPORT_SYMBOL_GPL(vb2_dma_contig_clear_max_seg_size); | |
771 | ||
1a758d4e | 772 | MODULE_DESCRIPTION("DMA-contig memory handling routines for videobuf2"); |
95072084 | 773 | MODULE_AUTHOR("Pawel Osciak <pawel@osciak.com>"); |
1a758d4e | 774 | MODULE_LICENSE("GPL"); |