Commit | Line | Data |
---|---|---|
5ba3f757 AP |
1 | /* |
2 | * videobuf2-dma-sg.c - dma scatter/gather memory allocator for videobuf2 | |
3 | * | |
4 | * Copyright (C) 2010 Samsung Electronics | |
5 | * | |
6 | * Author: Andrzej Pietrasiewicz <andrzej.p@samsung.com> | |
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 | ||
13 | #include <linux/module.h> | |
14 | #include <linux/mm.h> | |
15 | #include <linux/scatterlist.h> | |
16 | #include <linux/sched.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/vmalloc.h> | |
19 | ||
c139990e | 20 | #include <media/videobuf2-v4l2.h> |
5ba3f757 AP |
21 | #include <media/videobuf2-memops.h> |
22 | #include <media/videobuf2-dma-sg.h> | |
23 | ||
ffdc78ef HV |
24 | static int debug; |
25 | module_param(debug, int, 0644); | |
26 | ||
27 | #define dprintk(level, fmt, arg...) \ | |
28 | do { \ | |
29 | if (debug >= level) \ | |
30 | printk(KERN_DEBUG "vb2-dma-sg: " fmt, ## arg); \ | |
31 | } while (0) | |
32 | ||
5ba3f757 | 33 | struct vb2_dma_sg_buf { |
0c3a14c1 | 34 | struct device *dev; |
5ba3f757 AP |
35 | void *vaddr; |
36 | struct page **pages; | |
3336c24f | 37 | struct frame_vector *vec; |
5ba3f757 | 38 | int offset; |
cd474037 | 39 | enum dma_data_direction dma_dir; |
22301247 | 40 | struct sg_table sg_table; |
e078b79d HV |
41 | /* |
42 | * This will point to sg_table when used with the MMAP or USERPTR | |
43 | * memory model, and to the dma_buf sglist when used with the | |
44 | * DMABUF memory model. | |
45 | */ | |
46 | struct sg_table *dma_sgt; | |
22301247 RR |
47 | size_t size; |
48 | unsigned int num_pages; | |
5ba3f757 AP |
49 | atomic_t refcount; |
50 | struct vb2_vmarea_handler handler; | |
e078b79d HV |
51 | |
52 | struct dma_buf_attachment *db_attach; | |
5ba3f757 AP |
53 | }; |
54 | ||
55 | static void vb2_dma_sg_put(void *buf_priv); | |
56 | ||
df237281 RR |
57 | static int vb2_dma_sg_alloc_compacted(struct vb2_dma_sg_buf *buf, |
58 | gfp_t gfp_flags) | |
59 | { | |
60 | unsigned int last_page = 0; | |
22301247 | 61 | int size = buf->size; |
df237281 RR |
62 | |
63 | while (size > 0) { | |
64 | struct page *pages; | |
65 | int order; | |
66 | int i; | |
67 | ||
68 | order = get_order(size); | |
69 | /* Dont over allocate*/ | |
70 | if ((PAGE_SIZE << order) > size) | |
71 | order--; | |
72 | ||
73 | pages = NULL; | |
74 | while (!pages) { | |
75 | pages = alloc_pages(GFP_KERNEL | __GFP_ZERO | | |
76 | __GFP_NOWARN | gfp_flags, order); | |
77 | if (pages) | |
78 | break; | |
79 | ||
80 | if (order == 0) { | |
81 | while (last_page--) | |
82 | __free_page(buf->pages[last_page]); | |
83 | return -ENOMEM; | |
84 | } | |
85 | order--; | |
86 | } | |
87 | ||
88 | split_page(pages, order); | |
22301247 RR |
89 | for (i = 0; i < (1 << order); i++) |
90 | buf->pages[last_page++] = &pages[i]; | |
df237281 RR |
91 | |
92 | size -= PAGE_SIZE << order; | |
93 | } | |
94 | ||
95 | return 0; | |
96 | } | |
97 | ||
00085f1e | 98 | static void *vb2_dma_sg_alloc(struct device *dev, unsigned long dma_attrs, |
d16e832d HV |
99 | unsigned long size, enum dma_data_direction dma_dir, |
100 | gfp_t gfp_flags) | |
5ba3f757 AP |
101 | { |
102 | struct vb2_dma_sg_buf *buf; | |
d790b7ed | 103 | struct sg_table *sgt; |
df237281 | 104 | int ret; |
22301247 | 105 | int num_pages; |
5ba3f757 | 106 | |
36c0f8b3 | 107 | if (WARN_ON(dev == NULL)) |
0c3a14c1 | 108 | return NULL; |
5ba3f757 AP |
109 | buf = kzalloc(sizeof *buf, GFP_KERNEL); |
110 | if (!buf) | |
111 | return NULL; | |
112 | ||
113 | buf->vaddr = NULL; | |
d935c57e | 114 | buf->dma_dir = dma_dir; |
5ba3f757 | 115 | buf->offset = 0; |
22301247 | 116 | buf->size = size; |
7f841459 | 117 | /* size is already page aligned */ |
22301247 | 118 | buf->num_pages = size >> PAGE_SHIFT; |
e078b79d | 119 | buf->dma_sgt = &buf->sg_table; |
5ba3f757 | 120 | |
22301247 | 121 | buf->pages = kzalloc(buf->num_pages * sizeof(struct page *), |
5ba3f757 AP |
122 | GFP_KERNEL); |
123 | if (!buf->pages) | |
124 | goto fail_pages_array_alloc; | |
125 | ||
df237281 RR |
126 | ret = vb2_dma_sg_alloc_compacted(buf, gfp_flags); |
127 | if (ret) | |
128 | goto fail_pages_alloc; | |
5ba3f757 | 129 | |
e078b79d | 130 | ret = sg_alloc_table_from_pages(buf->dma_sgt, buf->pages, |
47bc59c5 | 131 | buf->num_pages, 0, size, GFP_KERNEL); |
22301247 RR |
132 | if (ret) |
133 | goto fail_table_alloc; | |
134 | ||
0c3a14c1 | 135 | /* Prevent the device from being released while the buffer is used */ |
36c0f8b3 | 136 | buf->dev = get_device(dev); |
d790b7ed HV |
137 | |
138 | sgt = &buf->sg_table; | |
251a79f8 HV |
139 | /* |
140 | * No need to sync to the device, this will happen later when the | |
141 | * prepare() memop is called. | |
142 | */ | |
6a5d77cb | 143 | sgt->nents = dma_map_sg_attrs(buf->dev, sgt->sgl, sgt->orig_nents, |
00085f1e | 144 | buf->dma_dir, DMA_ATTR_SKIP_CPU_SYNC); |
6a5d77cb | 145 | if (!sgt->nents) |
d790b7ed | 146 | goto fail_map; |
d790b7ed | 147 | |
5ba3f757 AP |
148 | buf->handler.refcount = &buf->refcount; |
149 | buf->handler.put = vb2_dma_sg_put; | |
150 | buf->handler.arg = buf; | |
151 | ||
152 | atomic_inc(&buf->refcount); | |
153 | ||
ffdc78ef | 154 | dprintk(1, "%s: Allocated buffer of %d pages\n", |
22301247 | 155 | __func__, buf->num_pages); |
5ba3f757 AP |
156 | return buf; |
157 | ||
d790b7ed HV |
158 | fail_map: |
159 | put_device(buf->dev); | |
e078b79d | 160 | sg_free_table(buf->dma_sgt); |
22301247 RR |
161 | fail_table_alloc: |
162 | num_pages = buf->num_pages; | |
163 | while (num_pages--) | |
164 | __free_page(buf->pages[num_pages]); | |
5ba3f757 | 165 | fail_pages_alloc: |
a9bb36aa | 166 | kfree(buf->pages); |
5ba3f757 | 167 | fail_pages_array_alloc: |
5ba3f757 AP |
168 | kfree(buf); |
169 | return NULL; | |
170 | } | |
171 | ||
172 | static void vb2_dma_sg_put(void *buf_priv) | |
173 | { | |
174 | struct vb2_dma_sg_buf *buf = buf_priv; | |
d790b7ed | 175 | struct sg_table *sgt = &buf->sg_table; |
22301247 | 176 | int i = buf->num_pages; |
5ba3f757 AP |
177 | |
178 | if (atomic_dec_and_test(&buf->refcount)) { | |
ffdc78ef | 179 | dprintk(1, "%s: Freeing buffer of %d pages\n", __func__, |
22301247 | 180 | buf->num_pages); |
6a5d77cb | 181 | dma_unmap_sg_attrs(buf->dev, sgt->sgl, sgt->orig_nents, |
00085f1e | 182 | buf->dma_dir, DMA_ATTR_SKIP_CPU_SYNC); |
5ba3f757 | 183 | if (buf->vaddr) |
22301247 | 184 | vm_unmap_ram(buf->vaddr, buf->num_pages); |
e078b79d | 185 | sg_free_table(buf->dma_sgt); |
5ba3f757 AP |
186 | while (--i >= 0) |
187 | __free_page(buf->pages[i]); | |
188 | kfree(buf->pages); | |
0c3a14c1 | 189 | put_device(buf->dev); |
5ba3f757 AP |
190 | kfree(buf); |
191 | } | |
192 | } | |
193 | ||
d790b7ed HV |
194 | static void vb2_dma_sg_prepare(void *buf_priv) |
195 | { | |
196 | struct vb2_dma_sg_buf *buf = buf_priv; | |
e078b79d HV |
197 | struct sg_table *sgt = buf->dma_sgt; |
198 | ||
199 | /* DMABUF exporter will flush the cache for us */ | |
200 | if (buf->db_attach) | |
201 | return; | |
d790b7ed | 202 | |
418dae22 TL |
203 | dma_sync_sg_for_device(buf->dev, sgt->sgl, sgt->orig_nents, |
204 | buf->dma_dir); | |
d790b7ed HV |
205 | } |
206 | ||
207 | static void vb2_dma_sg_finish(void *buf_priv) | |
208 | { | |
209 | struct vb2_dma_sg_buf *buf = buf_priv; | |
e078b79d HV |
210 | struct sg_table *sgt = buf->dma_sgt; |
211 | ||
212 | /* DMABUF exporter will flush the cache for us */ | |
213 | if (buf->db_attach) | |
214 | return; | |
d790b7ed | 215 | |
418dae22 | 216 | dma_sync_sg_for_cpu(buf->dev, sgt->sgl, sgt->orig_nents, buf->dma_dir); |
d790b7ed HV |
217 | } |
218 | ||
36c0f8b3 | 219 | static void *vb2_dma_sg_get_userptr(struct device *dev, unsigned long vaddr, |
cd474037 HV |
220 | unsigned long size, |
221 | enum dma_data_direction dma_dir) | |
5ba3f757 AP |
222 | { |
223 | struct vb2_dma_sg_buf *buf; | |
d790b7ed | 224 | struct sg_table *sgt; |
3336c24f | 225 | struct frame_vector *vec; |
251a79f8 | 226 | |
5ba3f757 AP |
227 | buf = kzalloc(sizeof *buf, GFP_KERNEL); |
228 | if (!buf) | |
229 | return NULL; | |
230 | ||
231 | buf->vaddr = NULL; | |
36c0f8b3 | 232 | buf->dev = dev; |
cd474037 | 233 | buf->dma_dir = dma_dir; |
5ba3f757 | 234 | buf->offset = vaddr & ~PAGE_MASK; |
22301247 | 235 | buf->size = size; |
e078b79d | 236 | buf->dma_sgt = &buf->sg_table; |
3336c24f JK |
237 | vec = vb2_create_framevec(vaddr, size, buf->dma_dir == DMA_FROM_DEVICE); |
238 | if (IS_ERR(vec)) | |
239 | goto userptr_fail_pfnvec; | |
240 | buf->vec = vec; | |
5ba3f757 | 241 | |
3336c24f JK |
242 | buf->pages = frame_vector_pages(vec); |
243 | if (IS_ERR(buf->pages)) | |
244 | goto userptr_fail_sgtable; | |
245 | buf->num_pages = frame_vector_count(vec); | |
5ba3f757 | 246 | |
e078b79d | 247 | if (sg_alloc_table_from_pages(buf->dma_sgt, buf->pages, |
22301247 | 248 | buf->num_pages, buf->offset, size, 0)) |
3336c24f | 249 | goto userptr_fail_sgtable; |
22301247 | 250 | |
d790b7ed | 251 | sgt = &buf->sg_table; |
251a79f8 HV |
252 | /* |
253 | * No need to sync to the device, this will happen later when the | |
254 | * prepare() memop is called. | |
255 | */ | |
6a5d77cb | 256 | sgt->nents = dma_map_sg_attrs(buf->dev, sgt->sgl, sgt->orig_nents, |
00085f1e | 257 | buf->dma_dir, DMA_ATTR_SKIP_CPU_SYNC); |
6a5d77cb | 258 | if (!sgt->nents) |
d790b7ed | 259 | goto userptr_fail_map; |
6a5d77cb | 260 | |
5ba3f757 AP |
261 | return buf; |
262 | ||
d790b7ed HV |
263 | userptr_fail_map: |
264 | sg_free_table(&buf->sg_table); | |
3336c24f JK |
265 | userptr_fail_sgtable: |
266 | vb2_destroy_framevec(vec); | |
267 | userptr_fail_pfnvec: | |
5ba3f757 AP |
268 | kfree(buf); |
269 | return NULL; | |
270 | } | |
271 | ||
272 | /* | |
273 | * @put_userptr: inform the allocator that a USERPTR buffer will no longer | |
274 | * be used | |
275 | */ | |
276 | static void vb2_dma_sg_put_userptr(void *buf_priv) | |
277 | { | |
278 | struct vb2_dma_sg_buf *buf = buf_priv; | |
d790b7ed | 279 | struct sg_table *sgt = &buf->sg_table; |
22301247 | 280 | int i = buf->num_pages; |
5ba3f757 | 281 | |
ffdc78ef | 282 | dprintk(1, "%s: Releasing userspace buffer of %d pages\n", |
22301247 | 283 | __func__, buf->num_pages); |
6a5d77cb | 284 | dma_unmap_sg_attrs(buf->dev, sgt->sgl, sgt->orig_nents, buf->dma_dir, |
00085f1e | 285 | DMA_ATTR_SKIP_CPU_SYNC); |
5ba3f757 | 286 | if (buf->vaddr) |
22301247 | 287 | vm_unmap_ram(buf->vaddr, buf->num_pages); |
e078b79d | 288 | sg_free_table(buf->dma_sgt); |
5ba3f757 | 289 | while (--i >= 0) { |
cd474037 | 290 | if (buf->dma_dir == DMA_FROM_DEVICE) |
5ba3f757 | 291 | set_page_dirty_lock(buf->pages[i]); |
5ba3f757 | 292 | } |
3336c24f | 293 | vb2_destroy_framevec(buf->vec); |
5ba3f757 AP |
294 | kfree(buf); |
295 | } | |
296 | ||
297 | static void *vb2_dma_sg_vaddr(void *buf_priv) | |
298 | { | |
299 | struct vb2_dma_sg_buf *buf = buf_priv; | |
300 | ||
301 | BUG_ON(!buf); | |
302 | ||
e078b79d HV |
303 | if (!buf->vaddr) { |
304 | if (buf->db_attach) | |
305 | buf->vaddr = dma_buf_vmap(buf->db_attach->dmabuf); | |
306 | else | |
307 | buf->vaddr = vm_map_ram(buf->pages, | |
308 | buf->num_pages, -1, PAGE_KERNEL); | |
309 | } | |
5ba3f757 AP |
310 | |
311 | /* add offset in case userptr is not page-aligned */ | |
e078b79d | 312 | return buf->vaddr ? buf->vaddr + buf->offset : NULL; |
5ba3f757 AP |
313 | } |
314 | ||
315 | static unsigned int vb2_dma_sg_num_users(void *buf_priv) | |
316 | { | |
317 | struct vb2_dma_sg_buf *buf = buf_priv; | |
318 | ||
319 | return atomic_read(&buf->refcount); | |
320 | } | |
321 | ||
322 | static int vb2_dma_sg_mmap(void *buf_priv, struct vm_area_struct *vma) | |
323 | { | |
324 | struct vb2_dma_sg_buf *buf = buf_priv; | |
325 | unsigned long uaddr = vma->vm_start; | |
326 | unsigned long usize = vma->vm_end - vma->vm_start; | |
327 | int i = 0; | |
328 | ||
329 | if (!buf) { | |
330 | printk(KERN_ERR "No memory to map\n"); | |
331 | return -EINVAL; | |
332 | } | |
333 | ||
334 | do { | |
335 | int ret; | |
336 | ||
337 | ret = vm_insert_page(vma, uaddr, buf->pages[i++]); | |
338 | if (ret) { | |
339 | printk(KERN_ERR "Remapping memory, error: %d\n", ret); | |
340 | return ret; | |
341 | } | |
342 | ||
343 | uaddr += PAGE_SIZE; | |
344 | usize -= PAGE_SIZE; | |
345 | } while (usize > 0); | |
346 | ||
347 | ||
348 | /* | |
349 | * Use common vm_area operations to track buffer refcount. | |
350 | */ | |
351 | vma->vm_private_data = &buf->handler; | |
352 | vma->vm_ops = &vb2_common_vm_ops; | |
353 | ||
354 | vma->vm_ops->open(vma); | |
355 | ||
356 | return 0; | |
357 | } | |
358 | ||
041c7b6a HV |
359 | /*********************************************/ |
360 | /* DMABUF ops for exporters */ | |
361 | /*********************************************/ | |
362 | ||
363 | struct vb2_dma_sg_attachment { | |
364 | struct sg_table sgt; | |
365 | enum dma_data_direction dma_dir; | |
366 | }; | |
367 | ||
368 | static int vb2_dma_sg_dmabuf_ops_attach(struct dma_buf *dbuf, struct device *dev, | |
369 | struct dma_buf_attachment *dbuf_attach) | |
370 | { | |
371 | struct vb2_dma_sg_attachment *attach; | |
372 | unsigned int i; | |
373 | struct scatterlist *rd, *wr; | |
374 | struct sg_table *sgt; | |
375 | struct vb2_dma_sg_buf *buf = dbuf->priv; | |
376 | int ret; | |
377 | ||
378 | attach = kzalloc(sizeof(*attach), GFP_KERNEL); | |
379 | if (!attach) | |
380 | return -ENOMEM; | |
381 | ||
382 | sgt = &attach->sgt; | |
383 | /* Copy the buf->base_sgt scatter list to the attachment, as we can't | |
384 | * map the same scatter list to multiple attachments at the same time. | |
385 | */ | |
386 | ret = sg_alloc_table(sgt, buf->dma_sgt->orig_nents, GFP_KERNEL); | |
387 | if (ret) { | |
388 | kfree(attach); | |
389 | return -ENOMEM; | |
390 | } | |
391 | ||
392 | rd = buf->dma_sgt->sgl; | |
393 | wr = sgt->sgl; | |
394 | for (i = 0; i < sgt->orig_nents; ++i) { | |
395 | sg_set_page(wr, sg_page(rd), rd->length, rd->offset); | |
396 | rd = sg_next(rd); | |
397 | wr = sg_next(wr); | |
398 | } | |
399 | ||
400 | attach->dma_dir = DMA_NONE; | |
401 | dbuf_attach->priv = attach; | |
402 | ||
403 | return 0; | |
404 | } | |
405 | ||
406 | static void vb2_dma_sg_dmabuf_ops_detach(struct dma_buf *dbuf, | |
407 | struct dma_buf_attachment *db_attach) | |
408 | { | |
409 | struct vb2_dma_sg_attachment *attach = db_attach->priv; | |
410 | struct sg_table *sgt; | |
411 | ||
412 | if (!attach) | |
413 | return; | |
414 | ||
415 | sgt = &attach->sgt; | |
416 | ||
417 | /* release the scatterlist cache */ | |
418 | if (attach->dma_dir != DMA_NONE) | |
419 | dma_unmap_sg(db_attach->dev, sgt->sgl, sgt->orig_nents, | |
420 | attach->dma_dir); | |
421 | sg_free_table(sgt); | |
422 | kfree(attach); | |
423 | db_attach->priv = NULL; | |
424 | } | |
425 | ||
426 | static struct sg_table *vb2_dma_sg_dmabuf_ops_map( | |
427 | struct dma_buf_attachment *db_attach, enum dma_data_direction dma_dir) | |
428 | { | |
429 | struct vb2_dma_sg_attachment *attach = db_attach->priv; | |
430 | /* stealing dmabuf mutex to serialize map/unmap operations */ | |
431 | struct mutex *lock = &db_attach->dmabuf->lock; | |
432 | struct sg_table *sgt; | |
041c7b6a HV |
433 | |
434 | mutex_lock(lock); | |
435 | ||
436 | sgt = &attach->sgt; | |
437 | /* return previously mapped sg table */ | |
438 | if (attach->dma_dir == dma_dir) { | |
439 | mutex_unlock(lock); | |
440 | return sgt; | |
441 | } | |
442 | ||
443 | /* release any previous cache */ | |
444 | if (attach->dma_dir != DMA_NONE) { | |
445 | dma_unmap_sg(db_attach->dev, sgt->sgl, sgt->orig_nents, | |
446 | attach->dma_dir); | |
447 | attach->dma_dir = DMA_NONE; | |
448 | } | |
449 | ||
450 | /* mapping to the client with new direction */ | |
6a5d77cb RR |
451 | sgt->nents = dma_map_sg(db_attach->dev, sgt->sgl, sgt->orig_nents, |
452 | dma_dir); | |
453 | if (!sgt->nents) { | |
041c7b6a HV |
454 | pr_err("failed to map scatterlist\n"); |
455 | mutex_unlock(lock); | |
456 | return ERR_PTR(-EIO); | |
457 | } | |
458 | ||
459 | attach->dma_dir = dma_dir; | |
460 | ||
461 | mutex_unlock(lock); | |
462 | ||
463 | return sgt; | |
464 | } | |
465 | ||
466 | static void vb2_dma_sg_dmabuf_ops_unmap(struct dma_buf_attachment *db_attach, | |
467 | struct sg_table *sgt, enum dma_data_direction dma_dir) | |
468 | { | |
469 | /* nothing to be done here */ | |
470 | } | |
471 | ||
472 | static void vb2_dma_sg_dmabuf_ops_release(struct dma_buf *dbuf) | |
473 | { | |
474 | /* drop reference obtained in vb2_dma_sg_get_dmabuf */ | |
475 | vb2_dma_sg_put(dbuf->priv); | |
476 | } | |
477 | ||
478 | static void *vb2_dma_sg_dmabuf_ops_kmap(struct dma_buf *dbuf, unsigned long pgnum) | |
479 | { | |
480 | struct vb2_dma_sg_buf *buf = dbuf->priv; | |
481 | ||
482 | return buf->vaddr ? buf->vaddr + pgnum * PAGE_SIZE : NULL; | |
483 | } | |
484 | ||
485 | static void *vb2_dma_sg_dmabuf_ops_vmap(struct dma_buf *dbuf) | |
486 | { | |
487 | struct vb2_dma_sg_buf *buf = dbuf->priv; | |
488 | ||
489 | return vb2_dma_sg_vaddr(buf); | |
490 | } | |
491 | ||
492 | static int vb2_dma_sg_dmabuf_ops_mmap(struct dma_buf *dbuf, | |
493 | struct vm_area_struct *vma) | |
494 | { | |
495 | return vb2_dma_sg_mmap(dbuf->priv, vma); | |
496 | } | |
497 | ||
498 | static struct dma_buf_ops vb2_dma_sg_dmabuf_ops = { | |
499 | .attach = vb2_dma_sg_dmabuf_ops_attach, | |
500 | .detach = vb2_dma_sg_dmabuf_ops_detach, | |
501 | .map_dma_buf = vb2_dma_sg_dmabuf_ops_map, | |
502 | .unmap_dma_buf = vb2_dma_sg_dmabuf_ops_unmap, | |
503 | .kmap = vb2_dma_sg_dmabuf_ops_kmap, | |
504 | .kmap_atomic = vb2_dma_sg_dmabuf_ops_kmap, | |
505 | .vmap = vb2_dma_sg_dmabuf_ops_vmap, | |
506 | .mmap = vb2_dma_sg_dmabuf_ops_mmap, | |
507 | .release = vb2_dma_sg_dmabuf_ops_release, | |
508 | }; | |
509 | ||
510 | static struct dma_buf *vb2_dma_sg_get_dmabuf(void *buf_priv, unsigned long flags) | |
511 | { | |
512 | struct vb2_dma_sg_buf *buf = buf_priv; | |
513 | struct dma_buf *dbuf; | |
d8fbe341 SS |
514 | DEFINE_DMA_BUF_EXPORT_INFO(exp_info); |
515 | ||
516 | exp_info.ops = &vb2_dma_sg_dmabuf_ops; | |
517 | exp_info.size = buf->size; | |
518 | exp_info.flags = flags; | |
519 | exp_info.priv = buf; | |
041c7b6a HV |
520 | |
521 | if (WARN_ON(!buf->dma_sgt)) | |
522 | return NULL; | |
523 | ||
d8fbe341 | 524 | dbuf = dma_buf_export(&exp_info); |
041c7b6a HV |
525 | if (IS_ERR(dbuf)) |
526 | return NULL; | |
527 | ||
528 | /* dmabuf keeps reference to vb2 buffer */ | |
529 | atomic_inc(&buf->refcount); | |
530 | ||
531 | return dbuf; | |
532 | } | |
533 | ||
e078b79d HV |
534 | /*********************************************/ |
535 | /* callbacks for DMABUF buffers */ | |
536 | /*********************************************/ | |
537 | ||
538 | static int vb2_dma_sg_map_dmabuf(void *mem_priv) | |
539 | { | |
540 | struct vb2_dma_sg_buf *buf = mem_priv; | |
541 | struct sg_table *sgt; | |
542 | ||
543 | if (WARN_ON(!buf->db_attach)) { | |
544 | pr_err("trying to pin a non attached buffer\n"); | |
545 | return -EINVAL; | |
546 | } | |
547 | ||
548 | if (WARN_ON(buf->dma_sgt)) { | |
549 | pr_err("dmabuf buffer is already pinned\n"); | |
550 | return 0; | |
551 | } | |
552 | ||
553 | /* get the associated scatterlist for this buffer */ | |
554 | sgt = dma_buf_map_attachment(buf->db_attach, buf->dma_dir); | |
555 | if (IS_ERR(sgt)) { | |
556 | pr_err("Error getting dmabuf scatterlist\n"); | |
557 | return -EINVAL; | |
558 | } | |
559 | ||
560 | buf->dma_sgt = sgt; | |
561 | buf->vaddr = NULL; | |
562 | ||
563 | return 0; | |
564 | } | |
565 | ||
566 | static void vb2_dma_sg_unmap_dmabuf(void *mem_priv) | |
567 | { | |
568 | struct vb2_dma_sg_buf *buf = mem_priv; | |
569 | struct sg_table *sgt = buf->dma_sgt; | |
570 | ||
571 | if (WARN_ON(!buf->db_attach)) { | |
572 | pr_err("trying to unpin a not attached buffer\n"); | |
573 | return; | |
574 | } | |
575 | ||
576 | if (WARN_ON(!sgt)) { | |
577 | pr_err("dmabuf buffer is already unpinned\n"); | |
578 | return; | |
579 | } | |
580 | ||
581 | if (buf->vaddr) { | |
582 | dma_buf_vunmap(buf->db_attach->dmabuf, buf->vaddr); | |
583 | buf->vaddr = NULL; | |
584 | } | |
585 | dma_buf_unmap_attachment(buf->db_attach, sgt, buf->dma_dir); | |
586 | ||
587 | buf->dma_sgt = NULL; | |
588 | } | |
589 | ||
590 | static void vb2_dma_sg_detach_dmabuf(void *mem_priv) | |
591 | { | |
592 | struct vb2_dma_sg_buf *buf = mem_priv; | |
593 | ||
594 | /* if vb2 works correctly you should never detach mapped buffer */ | |
595 | if (WARN_ON(buf->dma_sgt)) | |
596 | vb2_dma_sg_unmap_dmabuf(buf); | |
597 | ||
598 | /* detach this attachment */ | |
599 | dma_buf_detach(buf->db_attach->dmabuf, buf->db_attach); | |
600 | kfree(buf); | |
601 | } | |
602 | ||
36c0f8b3 | 603 | static void *vb2_dma_sg_attach_dmabuf(struct device *dev, struct dma_buf *dbuf, |
e078b79d HV |
604 | unsigned long size, enum dma_data_direction dma_dir) |
605 | { | |
e078b79d HV |
606 | struct vb2_dma_sg_buf *buf; |
607 | struct dma_buf_attachment *dba; | |
608 | ||
609 | if (dbuf->size < size) | |
610 | return ERR_PTR(-EFAULT); | |
611 | ||
612 | buf = kzalloc(sizeof(*buf), GFP_KERNEL); | |
613 | if (!buf) | |
614 | return ERR_PTR(-ENOMEM); | |
615 | ||
36c0f8b3 | 616 | buf->dev = dev; |
e078b79d HV |
617 | /* create attachment for the dmabuf with the user device */ |
618 | dba = dma_buf_attach(dbuf, buf->dev); | |
619 | if (IS_ERR(dba)) { | |
620 | pr_err("failed to attach dmabuf\n"); | |
621 | kfree(buf); | |
622 | return dba; | |
623 | } | |
624 | ||
625 | buf->dma_dir = dma_dir; | |
626 | buf->size = size; | |
627 | buf->db_attach = dba; | |
628 | ||
629 | return buf; | |
630 | } | |
631 | ||
5ba3f757 AP |
632 | static void *vb2_dma_sg_cookie(void *buf_priv) |
633 | { | |
634 | struct vb2_dma_sg_buf *buf = buf_priv; | |
635 | ||
e078b79d | 636 | return buf->dma_sgt; |
5ba3f757 AP |
637 | } |
638 | ||
639 | const struct vb2_mem_ops vb2_dma_sg_memops = { | |
640 | .alloc = vb2_dma_sg_alloc, | |
641 | .put = vb2_dma_sg_put, | |
642 | .get_userptr = vb2_dma_sg_get_userptr, | |
643 | .put_userptr = vb2_dma_sg_put_userptr, | |
d790b7ed HV |
644 | .prepare = vb2_dma_sg_prepare, |
645 | .finish = vb2_dma_sg_finish, | |
5ba3f757 AP |
646 | .vaddr = vb2_dma_sg_vaddr, |
647 | .mmap = vb2_dma_sg_mmap, | |
648 | .num_users = vb2_dma_sg_num_users, | |
041c7b6a | 649 | .get_dmabuf = vb2_dma_sg_get_dmabuf, |
e078b79d HV |
650 | .map_dmabuf = vb2_dma_sg_map_dmabuf, |
651 | .unmap_dmabuf = vb2_dma_sg_unmap_dmabuf, | |
652 | .attach_dmabuf = vb2_dma_sg_attach_dmabuf, | |
653 | .detach_dmabuf = vb2_dma_sg_detach_dmabuf, | |
5ba3f757 AP |
654 | .cookie = vb2_dma_sg_cookie, |
655 | }; | |
656 | EXPORT_SYMBOL_GPL(vb2_dma_sg_memops); | |
657 | ||
658 | MODULE_DESCRIPTION("dma scatter/gather memory handling routines for videobuf2"); | |
659 | MODULE_AUTHOR("Andrzej Pietrasiewicz"); | |
660 | MODULE_LICENSE("GPL"); |