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 | ||
20 | #include <media/videobuf2-core.h> | |
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 | ||
0c3a14c1 HV |
33 | struct vb2_dma_sg_conf { |
34 | struct device *dev; | |
35 | }; | |
36 | ||
5ba3f757 | 37 | struct vb2_dma_sg_buf { |
0c3a14c1 | 38 | struct device *dev; |
5ba3f757 AP |
39 | void *vaddr; |
40 | struct page **pages; | |
5ba3f757 | 41 | int offset; |
cd474037 | 42 | enum dma_data_direction dma_dir; |
22301247 | 43 | struct sg_table sg_table; |
e078b79d HV |
44 | /* |
45 | * This will point to sg_table when used with the MMAP or USERPTR | |
46 | * memory model, and to the dma_buf sglist when used with the | |
47 | * DMABUF memory model. | |
48 | */ | |
49 | struct sg_table *dma_sgt; | |
22301247 RR |
50 | size_t size; |
51 | unsigned int num_pages; | |
5ba3f757 AP |
52 | atomic_t refcount; |
53 | struct vb2_vmarea_handler handler; | |
50ac952d | 54 | struct vm_area_struct *vma; |
e078b79d HV |
55 | |
56 | struct dma_buf_attachment *db_attach; | |
5ba3f757 AP |
57 | }; |
58 | ||
59 | static void vb2_dma_sg_put(void *buf_priv); | |
60 | ||
df237281 RR |
61 | static int vb2_dma_sg_alloc_compacted(struct vb2_dma_sg_buf *buf, |
62 | gfp_t gfp_flags) | |
63 | { | |
64 | unsigned int last_page = 0; | |
22301247 | 65 | int size = buf->size; |
df237281 RR |
66 | |
67 | while (size > 0) { | |
68 | struct page *pages; | |
69 | int order; | |
70 | int i; | |
71 | ||
72 | order = get_order(size); | |
73 | /* Dont over allocate*/ | |
74 | if ((PAGE_SIZE << order) > size) | |
75 | order--; | |
76 | ||
77 | pages = NULL; | |
78 | while (!pages) { | |
79 | pages = alloc_pages(GFP_KERNEL | __GFP_ZERO | | |
80 | __GFP_NOWARN | gfp_flags, order); | |
81 | if (pages) | |
82 | break; | |
83 | ||
84 | if (order == 0) { | |
85 | while (last_page--) | |
86 | __free_page(buf->pages[last_page]); | |
87 | return -ENOMEM; | |
88 | } | |
89 | order--; | |
90 | } | |
91 | ||
92 | split_page(pages, order); | |
22301247 RR |
93 | for (i = 0; i < (1 << order); i++) |
94 | buf->pages[last_page++] = &pages[i]; | |
df237281 RR |
95 | |
96 | size -= PAGE_SIZE << order; | |
97 | } | |
98 | ||
99 | return 0; | |
100 | } | |
101 | ||
d935c57e HV |
102 | static void *vb2_dma_sg_alloc(void *alloc_ctx, unsigned long size, |
103 | enum dma_data_direction dma_dir, gfp_t gfp_flags) | |
5ba3f757 | 104 | { |
0c3a14c1 | 105 | struct vb2_dma_sg_conf *conf = alloc_ctx; |
5ba3f757 | 106 | struct vb2_dma_sg_buf *buf; |
d790b7ed | 107 | struct sg_table *sgt; |
df237281 | 108 | int ret; |
22301247 | 109 | int num_pages; |
251a79f8 HV |
110 | DEFINE_DMA_ATTRS(attrs); |
111 | ||
112 | dma_set_attr(DMA_ATTR_SKIP_CPU_SYNC, &attrs); | |
5ba3f757 | 113 | |
0c3a14c1 HV |
114 | if (WARN_ON(alloc_ctx == NULL)) |
115 | return NULL; | |
5ba3f757 AP |
116 | buf = kzalloc(sizeof *buf, GFP_KERNEL); |
117 | if (!buf) | |
118 | return NULL; | |
119 | ||
120 | buf->vaddr = NULL; | |
d935c57e | 121 | buf->dma_dir = dma_dir; |
5ba3f757 | 122 | buf->offset = 0; |
22301247 | 123 | buf->size = size; |
7f841459 | 124 | /* size is already page aligned */ |
22301247 | 125 | buf->num_pages = size >> PAGE_SHIFT; |
e078b79d | 126 | buf->dma_sgt = &buf->sg_table; |
5ba3f757 | 127 | |
22301247 | 128 | buf->pages = kzalloc(buf->num_pages * sizeof(struct page *), |
5ba3f757 AP |
129 | GFP_KERNEL); |
130 | if (!buf->pages) | |
131 | goto fail_pages_array_alloc; | |
132 | ||
df237281 RR |
133 | ret = vb2_dma_sg_alloc_compacted(buf, gfp_flags); |
134 | if (ret) | |
135 | goto fail_pages_alloc; | |
5ba3f757 | 136 | |
e078b79d | 137 | ret = sg_alloc_table_from_pages(buf->dma_sgt, buf->pages, |
47bc59c5 | 138 | buf->num_pages, 0, size, GFP_KERNEL); |
22301247 RR |
139 | if (ret) |
140 | goto fail_table_alloc; | |
141 | ||
0c3a14c1 HV |
142 | /* Prevent the device from being released while the buffer is used */ |
143 | buf->dev = get_device(conf->dev); | |
d790b7ed HV |
144 | |
145 | sgt = &buf->sg_table; | |
251a79f8 HV |
146 | /* |
147 | * No need to sync to the device, this will happen later when the | |
148 | * prepare() memop is called. | |
149 | */ | |
6a5d77cb RR |
150 | sgt->nents = dma_map_sg_attrs(buf->dev, sgt->sgl, sgt->orig_nents, |
151 | buf->dma_dir, &attrs); | |
152 | if (!sgt->nents) | |
d790b7ed | 153 | goto fail_map; |
d790b7ed | 154 | |
5ba3f757 AP |
155 | buf->handler.refcount = &buf->refcount; |
156 | buf->handler.put = vb2_dma_sg_put; | |
157 | buf->handler.arg = buf; | |
158 | ||
159 | atomic_inc(&buf->refcount); | |
160 | ||
ffdc78ef | 161 | dprintk(1, "%s: Allocated buffer of %d pages\n", |
22301247 | 162 | __func__, buf->num_pages); |
5ba3f757 AP |
163 | return buf; |
164 | ||
d790b7ed HV |
165 | fail_map: |
166 | put_device(buf->dev); | |
e078b79d | 167 | sg_free_table(buf->dma_sgt); |
22301247 RR |
168 | fail_table_alloc: |
169 | num_pages = buf->num_pages; | |
170 | while (num_pages--) | |
171 | __free_page(buf->pages[num_pages]); | |
5ba3f757 | 172 | fail_pages_alloc: |
a9bb36aa | 173 | kfree(buf->pages); |
5ba3f757 | 174 | fail_pages_array_alloc: |
5ba3f757 AP |
175 | kfree(buf); |
176 | return NULL; | |
177 | } | |
178 | ||
179 | static void vb2_dma_sg_put(void *buf_priv) | |
180 | { | |
181 | struct vb2_dma_sg_buf *buf = buf_priv; | |
d790b7ed | 182 | struct sg_table *sgt = &buf->sg_table; |
22301247 | 183 | int i = buf->num_pages; |
5ba3f757 AP |
184 | |
185 | if (atomic_dec_and_test(&buf->refcount)) { | |
251a79f8 HV |
186 | DEFINE_DMA_ATTRS(attrs); |
187 | ||
188 | dma_set_attr(DMA_ATTR_SKIP_CPU_SYNC, &attrs); | |
ffdc78ef | 189 | dprintk(1, "%s: Freeing buffer of %d pages\n", __func__, |
22301247 | 190 | buf->num_pages); |
6a5d77cb | 191 | dma_unmap_sg_attrs(buf->dev, sgt->sgl, sgt->orig_nents, |
251a79f8 | 192 | buf->dma_dir, &attrs); |
5ba3f757 | 193 | if (buf->vaddr) |
22301247 | 194 | vm_unmap_ram(buf->vaddr, buf->num_pages); |
e078b79d | 195 | sg_free_table(buf->dma_sgt); |
5ba3f757 AP |
196 | while (--i >= 0) |
197 | __free_page(buf->pages[i]); | |
198 | kfree(buf->pages); | |
0c3a14c1 | 199 | put_device(buf->dev); |
5ba3f757 AP |
200 | kfree(buf); |
201 | } | |
202 | } | |
203 | ||
d790b7ed HV |
204 | static void vb2_dma_sg_prepare(void *buf_priv) |
205 | { | |
206 | struct vb2_dma_sg_buf *buf = buf_priv; | |
e078b79d HV |
207 | struct sg_table *sgt = buf->dma_sgt; |
208 | ||
209 | /* DMABUF exporter will flush the cache for us */ | |
210 | if (buf->db_attach) | |
211 | return; | |
d790b7ed HV |
212 | |
213 | dma_sync_sg_for_device(buf->dev, sgt->sgl, sgt->nents, buf->dma_dir); | |
214 | } | |
215 | ||
216 | static void vb2_dma_sg_finish(void *buf_priv) | |
217 | { | |
218 | struct vb2_dma_sg_buf *buf = buf_priv; | |
e078b79d HV |
219 | struct sg_table *sgt = buf->dma_sgt; |
220 | ||
221 | /* DMABUF exporter will flush the cache for us */ | |
222 | if (buf->db_attach) | |
223 | return; | |
d790b7ed HV |
224 | |
225 | dma_sync_sg_for_cpu(buf->dev, sgt->sgl, sgt->nents, buf->dma_dir); | |
226 | } | |
227 | ||
50ac952d RR |
228 | static inline int vma_is_io(struct vm_area_struct *vma) |
229 | { | |
230 | return !!(vma->vm_flags & (VM_IO | VM_PFNMAP)); | |
231 | } | |
232 | ||
5ba3f757 | 233 | static void *vb2_dma_sg_get_userptr(void *alloc_ctx, unsigned long vaddr, |
cd474037 HV |
234 | unsigned long size, |
235 | enum dma_data_direction dma_dir) | |
5ba3f757 | 236 | { |
d790b7ed | 237 | struct vb2_dma_sg_conf *conf = alloc_ctx; |
5ba3f757 AP |
238 | struct vb2_dma_sg_buf *buf; |
239 | unsigned long first, last; | |
22301247 | 240 | int num_pages_from_user; |
50ac952d | 241 | struct vm_area_struct *vma; |
d790b7ed | 242 | struct sg_table *sgt; |
251a79f8 HV |
243 | DEFINE_DMA_ATTRS(attrs); |
244 | ||
245 | dma_set_attr(DMA_ATTR_SKIP_CPU_SYNC, &attrs); | |
5ba3f757 AP |
246 | |
247 | buf = kzalloc(sizeof *buf, GFP_KERNEL); | |
248 | if (!buf) | |
249 | return NULL; | |
250 | ||
251 | buf->vaddr = NULL; | |
d790b7ed | 252 | buf->dev = conf->dev; |
cd474037 | 253 | buf->dma_dir = dma_dir; |
5ba3f757 | 254 | buf->offset = vaddr & ~PAGE_MASK; |
22301247 | 255 | buf->size = size; |
e078b79d | 256 | buf->dma_sgt = &buf->sg_table; |
5ba3f757 AP |
257 | |
258 | first = (vaddr & PAGE_MASK) >> PAGE_SHIFT; | |
259 | last = ((vaddr + size - 1) & PAGE_MASK) >> PAGE_SHIFT; | |
22301247 | 260 | buf->num_pages = last - first + 1; |
5ba3f757 | 261 | |
22301247 | 262 | buf->pages = kzalloc(buf->num_pages * sizeof(struct page *), |
5ba3f757 AP |
263 | GFP_KERNEL); |
264 | if (!buf->pages) | |
64c832a4 | 265 | goto userptr_fail_alloc_pages; |
5ba3f757 | 266 | |
50ac952d RR |
267 | vma = find_vma(current->mm, vaddr); |
268 | if (!vma) { | |
269 | dprintk(1, "no vma for address %lu\n", vaddr); | |
270 | goto userptr_fail_find_vma; | |
271 | } | |
272 | ||
273 | if (vma->vm_end < vaddr + size) { | |
274 | dprintk(1, "vma at %lu is too small for %lu bytes\n", | |
275 | vaddr, size); | |
276 | goto userptr_fail_find_vma; | |
277 | } | |
278 | ||
279 | buf->vma = vb2_get_vma(vma); | |
280 | if (!buf->vma) { | |
281 | dprintk(1, "failed to copy vma\n"); | |
282 | goto userptr_fail_find_vma; | |
283 | } | |
284 | ||
285 | if (vma_is_io(buf->vma)) { | |
286 | for (num_pages_from_user = 0; | |
287 | num_pages_from_user < buf->num_pages; | |
288 | ++num_pages_from_user, vaddr += PAGE_SIZE) { | |
289 | unsigned long pfn; | |
290 | ||
227ae227 | 291 | if (follow_pfn(vma, vaddr, &pfn)) { |
50ac952d RR |
292 | dprintk(1, "no page for address %lu\n", vaddr); |
293 | break; | |
294 | } | |
295 | buf->pages[num_pages_from_user] = pfn_to_page(pfn); | |
296 | } | |
297 | } else | |
298 | num_pages_from_user = get_user_pages(current, current->mm, | |
5ba3f757 | 299 | vaddr & PAGE_MASK, |
22301247 | 300 | buf->num_pages, |
cd474037 | 301 | buf->dma_dir == DMA_FROM_DEVICE, |
5ba3f757 AP |
302 | 1, /* force */ |
303 | buf->pages, | |
304 | NULL); | |
b037c0fd | 305 | |
22301247 | 306 | if (num_pages_from_user != buf->num_pages) |
5ba3f757 AP |
307 | goto userptr_fail_get_user_pages; |
308 | ||
e078b79d | 309 | if (sg_alloc_table_from_pages(buf->dma_sgt, buf->pages, |
22301247 RR |
310 | buf->num_pages, buf->offset, size, 0)) |
311 | goto userptr_fail_alloc_table_from_pages; | |
312 | ||
d790b7ed | 313 | sgt = &buf->sg_table; |
251a79f8 HV |
314 | /* |
315 | * No need to sync to the device, this will happen later when the | |
316 | * prepare() memop is called. | |
317 | */ | |
6a5d77cb RR |
318 | sgt->nents = dma_map_sg_attrs(buf->dev, sgt->sgl, sgt->orig_nents, |
319 | buf->dma_dir, &attrs); | |
320 | if (!sgt->nents) | |
d790b7ed | 321 | goto userptr_fail_map; |
6a5d77cb | 322 | |
5ba3f757 AP |
323 | return buf; |
324 | ||
d790b7ed HV |
325 | userptr_fail_map: |
326 | sg_free_table(&buf->sg_table); | |
22301247 | 327 | userptr_fail_alloc_table_from_pages: |
5ba3f757 | 328 | userptr_fail_get_user_pages: |
ffdc78ef | 329 | dprintk(1, "get_user_pages requested/got: %d/%d]\n", |
202dfbdc | 330 | buf->num_pages, num_pages_from_user); |
50ac952d RR |
331 | if (!vma_is_io(buf->vma)) |
332 | while (--num_pages_from_user >= 0) | |
333 | put_page(buf->pages[num_pages_from_user]); | |
334 | vb2_put_vma(buf->vma); | |
335 | userptr_fail_find_vma: | |
a9bb36aa | 336 | kfree(buf->pages); |
64c832a4 | 337 | userptr_fail_alloc_pages: |
5ba3f757 AP |
338 | kfree(buf); |
339 | return NULL; | |
340 | } | |
341 | ||
342 | /* | |
343 | * @put_userptr: inform the allocator that a USERPTR buffer will no longer | |
344 | * be used | |
345 | */ | |
346 | static void vb2_dma_sg_put_userptr(void *buf_priv) | |
347 | { | |
348 | struct vb2_dma_sg_buf *buf = buf_priv; | |
d790b7ed | 349 | struct sg_table *sgt = &buf->sg_table; |
22301247 | 350 | int i = buf->num_pages; |
251a79f8 HV |
351 | DEFINE_DMA_ATTRS(attrs); |
352 | ||
353 | dma_set_attr(DMA_ATTR_SKIP_CPU_SYNC, &attrs); | |
5ba3f757 | 354 | |
ffdc78ef | 355 | dprintk(1, "%s: Releasing userspace buffer of %d pages\n", |
22301247 | 356 | __func__, buf->num_pages); |
6a5d77cb RR |
357 | dma_unmap_sg_attrs(buf->dev, sgt->sgl, sgt->orig_nents, buf->dma_dir, |
358 | &attrs); | |
5ba3f757 | 359 | if (buf->vaddr) |
22301247 | 360 | vm_unmap_ram(buf->vaddr, buf->num_pages); |
e078b79d | 361 | sg_free_table(buf->dma_sgt); |
5ba3f757 | 362 | while (--i >= 0) { |
cd474037 | 363 | if (buf->dma_dir == DMA_FROM_DEVICE) |
5ba3f757 | 364 | set_page_dirty_lock(buf->pages[i]); |
50ac952d RR |
365 | if (!vma_is_io(buf->vma)) |
366 | put_page(buf->pages[i]); | |
5ba3f757 | 367 | } |
5ba3f757 | 368 | kfree(buf->pages); |
50ac952d | 369 | vb2_put_vma(buf->vma); |
5ba3f757 AP |
370 | kfree(buf); |
371 | } | |
372 | ||
373 | static void *vb2_dma_sg_vaddr(void *buf_priv) | |
374 | { | |
375 | struct vb2_dma_sg_buf *buf = buf_priv; | |
376 | ||
377 | BUG_ON(!buf); | |
378 | ||
e078b79d HV |
379 | if (!buf->vaddr) { |
380 | if (buf->db_attach) | |
381 | buf->vaddr = dma_buf_vmap(buf->db_attach->dmabuf); | |
382 | else | |
383 | buf->vaddr = vm_map_ram(buf->pages, | |
384 | buf->num_pages, -1, PAGE_KERNEL); | |
385 | } | |
5ba3f757 AP |
386 | |
387 | /* add offset in case userptr is not page-aligned */ | |
e078b79d | 388 | return buf->vaddr ? buf->vaddr + buf->offset : NULL; |
5ba3f757 AP |
389 | } |
390 | ||
391 | static unsigned int vb2_dma_sg_num_users(void *buf_priv) | |
392 | { | |
393 | struct vb2_dma_sg_buf *buf = buf_priv; | |
394 | ||
395 | return atomic_read(&buf->refcount); | |
396 | } | |
397 | ||
398 | static int vb2_dma_sg_mmap(void *buf_priv, struct vm_area_struct *vma) | |
399 | { | |
400 | struct vb2_dma_sg_buf *buf = buf_priv; | |
401 | unsigned long uaddr = vma->vm_start; | |
402 | unsigned long usize = vma->vm_end - vma->vm_start; | |
403 | int i = 0; | |
404 | ||
405 | if (!buf) { | |
406 | printk(KERN_ERR "No memory to map\n"); | |
407 | return -EINVAL; | |
408 | } | |
409 | ||
410 | do { | |
411 | int ret; | |
412 | ||
413 | ret = vm_insert_page(vma, uaddr, buf->pages[i++]); | |
414 | if (ret) { | |
415 | printk(KERN_ERR "Remapping memory, error: %d\n", ret); | |
416 | return ret; | |
417 | } | |
418 | ||
419 | uaddr += PAGE_SIZE; | |
420 | usize -= PAGE_SIZE; | |
421 | } while (usize > 0); | |
422 | ||
423 | ||
424 | /* | |
425 | * Use common vm_area operations to track buffer refcount. | |
426 | */ | |
427 | vma->vm_private_data = &buf->handler; | |
428 | vma->vm_ops = &vb2_common_vm_ops; | |
429 | ||
430 | vma->vm_ops->open(vma); | |
431 | ||
432 | return 0; | |
433 | } | |
434 | ||
041c7b6a HV |
435 | /*********************************************/ |
436 | /* DMABUF ops for exporters */ | |
437 | /*********************************************/ | |
438 | ||
439 | struct vb2_dma_sg_attachment { | |
440 | struct sg_table sgt; | |
441 | enum dma_data_direction dma_dir; | |
442 | }; | |
443 | ||
444 | static int vb2_dma_sg_dmabuf_ops_attach(struct dma_buf *dbuf, struct device *dev, | |
445 | struct dma_buf_attachment *dbuf_attach) | |
446 | { | |
447 | struct vb2_dma_sg_attachment *attach; | |
448 | unsigned int i; | |
449 | struct scatterlist *rd, *wr; | |
450 | struct sg_table *sgt; | |
451 | struct vb2_dma_sg_buf *buf = dbuf->priv; | |
452 | int ret; | |
453 | ||
454 | attach = kzalloc(sizeof(*attach), GFP_KERNEL); | |
455 | if (!attach) | |
456 | return -ENOMEM; | |
457 | ||
458 | sgt = &attach->sgt; | |
459 | /* Copy the buf->base_sgt scatter list to the attachment, as we can't | |
460 | * map the same scatter list to multiple attachments at the same time. | |
461 | */ | |
462 | ret = sg_alloc_table(sgt, buf->dma_sgt->orig_nents, GFP_KERNEL); | |
463 | if (ret) { | |
464 | kfree(attach); | |
465 | return -ENOMEM; | |
466 | } | |
467 | ||
468 | rd = buf->dma_sgt->sgl; | |
469 | wr = sgt->sgl; | |
470 | for (i = 0; i < sgt->orig_nents; ++i) { | |
471 | sg_set_page(wr, sg_page(rd), rd->length, rd->offset); | |
472 | rd = sg_next(rd); | |
473 | wr = sg_next(wr); | |
474 | } | |
475 | ||
476 | attach->dma_dir = DMA_NONE; | |
477 | dbuf_attach->priv = attach; | |
478 | ||
479 | return 0; | |
480 | } | |
481 | ||
482 | static void vb2_dma_sg_dmabuf_ops_detach(struct dma_buf *dbuf, | |
483 | struct dma_buf_attachment *db_attach) | |
484 | { | |
485 | struct vb2_dma_sg_attachment *attach = db_attach->priv; | |
486 | struct sg_table *sgt; | |
487 | ||
488 | if (!attach) | |
489 | return; | |
490 | ||
491 | sgt = &attach->sgt; | |
492 | ||
493 | /* release the scatterlist cache */ | |
494 | if (attach->dma_dir != DMA_NONE) | |
495 | dma_unmap_sg(db_attach->dev, sgt->sgl, sgt->orig_nents, | |
496 | attach->dma_dir); | |
497 | sg_free_table(sgt); | |
498 | kfree(attach); | |
499 | db_attach->priv = NULL; | |
500 | } | |
501 | ||
502 | static struct sg_table *vb2_dma_sg_dmabuf_ops_map( | |
503 | struct dma_buf_attachment *db_attach, enum dma_data_direction dma_dir) | |
504 | { | |
505 | struct vb2_dma_sg_attachment *attach = db_attach->priv; | |
506 | /* stealing dmabuf mutex to serialize map/unmap operations */ | |
507 | struct mutex *lock = &db_attach->dmabuf->lock; | |
508 | struct sg_table *sgt; | |
041c7b6a HV |
509 | |
510 | mutex_lock(lock); | |
511 | ||
512 | sgt = &attach->sgt; | |
513 | /* return previously mapped sg table */ | |
514 | if (attach->dma_dir == dma_dir) { | |
515 | mutex_unlock(lock); | |
516 | return sgt; | |
517 | } | |
518 | ||
519 | /* release any previous cache */ | |
520 | if (attach->dma_dir != DMA_NONE) { | |
521 | dma_unmap_sg(db_attach->dev, sgt->sgl, sgt->orig_nents, | |
522 | attach->dma_dir); | |
523 | attach->dma_dir = DMA_NONE; | |
524 | } | |
525 | ||
526 | /* mapping to the client with new direction */ | |
6a5d77cb RR |
527 | sgt->nents = dma_map_sg(db_attach->dev, sgt->sgl, sgt->orig_nents, |
528 | dma_dir); | |
529 | if (!sgt->nents) { | |
041c7b6a HV |
530 | pr_err("failed to map scatterlist\n"); |
531 | mutex_unlock(lock); | |
532 | return ERR_PTR(-EIO); | |
533 | } | |
534 | ||
535 | attach->dma_dir = dma_dir; | |
536 | ||
537 | mutex_unlock(lock); | |
538 | ||
539 | return sgt; | |
540 | } | |
541 | ||
542 | static void vb2_dma_sg_dmabuf_ops_unmap(struct dma_buf_attachment *db_attach, | |
543 | struct sg_table *sgt, enum dma_data_direction dma_dir) | |
544 | { | |
545 | /* nothing to be done here */ | |
546 | } | |
547 | ||
548 | static void vb2_dma_sg_dmabuf_ops_release(struct dma_buf *dbuf) | |
549 | { | |
550 | /* drop reference obtained in vb2_dma_sg_get_dmabuf */ | |
551 | vb2_dma_sg_put(dbuf->priv); | |
552 | } | |
553 | ||
554 | static void *vb2_dma_sg_dmabuf_ops_kmap(struct dma_buf *dbuf, unsigned long pgnum) | |
555 | { | |
556 | struct vb2_dma_sg_buf *buf = dbuf->priv; | |
557 | ||
558 | return buf->vaddr ? buf->vaddr + pgnum * PAGE_SIZE : NULL; | |
559 | } | |
560 | ||
561 | static void *vb2_dma_sg_dmabuf_ops_vmap(struct dma_buf *dbuf) | |
562 | { | |
563 | struct vb2_dma_sg_buf *buf = dbuf->priv; | |
564 | ||
565 | return vb2_dma_sg_vaddr(buf); | |
566 | } | |
567 | ||
568 | static int vb2_dma_sg_dmabuf_ops_mmap(struct dma_buf *dbuf, | |
569 | struct vm_area_struct *vma) | |
570 | { | |
571 | return vb2_dma_sg_mmap(dbuf->priv, vma); | |
572 | } | |
573 | ||
574 | static struct dma_buf_ops vb2_dma_sg_dmabuf_ops = { | |
575 | .attach = vb2_dma_sg_dmabuf_ops_attach, | |
576 | .detach = vb2_dma_sg_dmabuf_ops_detach, | |
577 | .map_dma_buf = vb2_dma_sg_dmabuf_ops_map, | |
578 | .unmap_dma_buf = vb2_dma_sg_dmabuf_ops_unmap, | |
579 | .kmap = vb2_dma_sg_dmabuf_ops_kmap, | |
580 | .kmap_atomic = vb2_dma_sg_dmabuf_ops_kmap, | |
581 | .vmap = vb2_dma_sg_dmabuf_ops_vmap, | |
582 | .mmap = vb2_dma_sg_dmabuf_ops_mmap, | |
583 | .release = vb2_dma_sg_dmabuf_ops_release, | |
584 | }; | |
585 | ||
586 | static struct dma_buf *vb2_dma_sg_get_dmabuf(void *buf_priv, unsigned long flags) | |
587 | { | |
588 | struct vb2_dma_sg_buf *buf = buf_priv; | |
589 | struct dma_buf *dbuf; | |
d8fbe341 SS |
590 | DEFINE_DMA_BUF_EXPORT_INFO(exp_info); |
591 | ||
592 | exp_info.ops = &vb2_dma_sg_dmabuf_ops; | |
593 | exp_info.size = buf->size; | |
594 | exp_info.flags = flags; | |
595 | exp_info.priv = buf; | |
041c7b6a HV |
596 | |
597 | if (WARN_ON(!buf->dma_sgt)) | |
598 | return NULL; | |
599 | ||
d8fbe341 | 600 | dbuf = dma_buf_export(&exp_info); |
041c7b6a HV |
601 | if (IS_ERR(dbuf)) |
602 | return NULL; | |
603 | ||
604 | /* dmabuf keeps reference to vb2 buffer */ | |
605 | atomic_inc(&buf->refcount); | |
606 | ||
607 | return dbuf; | |
608 | } | |
609 | ||
e078b79d HV |
610 | /*********************************************/ |
611 | /* callbacks for DMABUF buffers */ | |
612 | /*********************************************/ | |
613 | ||
614 | static int vb2_dma_sg_map_dmabuf(void *mem_priv) | |
615 | { | |
616 | struct vb2_dma_sg_buf *buf = mem_priv; | |
617 | struct sg_table *sgt; | |
618 | ||
619 | if (WARN_ON(!buf->db_attach)) { | |
620 | pr_err("trying to pin a non attached buffer\n"); | |
621 | return -EINVAL; | |
622 | } | |
623 | ||
624 | if (WARN_ON(buf->dma_sgt)) { | |
625 | pr_err("dmabuf buffer is already pinned\n"); | |
626 | return 0; | |
627 | } | |
628 | ||
629 | /* get the associated scatterlist for this buffer */ | |
630 | sgt = dma_buf_map_attachment(buf->db_attach, buf->dma_dir); | |
631 | if (IS_ERR(sgt)) { | |
632 | pr_err("Error getting dmabuf scatterlist\n"); | |
633 | return -EINVAL; | |
634 | } | |
635 | ||
636 | buf->dma_sgt = sgt; | |
637 | buf->vaddr = NULL; | |
638 | ||
639 | return 0; | |
640 | } | |
641 | ||
642 | static void vb2_dma_sg_unmap_dmabuf(void *mem_priv) | |
643 | { | |
644 | struct vb2_dma_sg_buf *buf = mem_priv; | |
645 | struct sg_table *sgt = buf->dma_sgt; | |
646 | ||
647 | if (WARN_ON(!buf->db_attach)) { | |
648 | pr_err("trying to unpin a not attached buffer\n"); | |
649 | return; | |
650 | } | |
651 | ||
652 | if (WARN_ON(!sgt)) { | |
653 | pr_err("dmabuf buffer is already unpinned\n"); | |
654 | return; | |
655 | } | |
656 | ||
657 | if (buf->vaddr) { | |
658 | dma_buf_vunmap(buf->db_attach->dmabuf, buf->vaddr); | |
659 | buf->vaddr = NULL; | |
660 | } | |
661 | dma_buf_unmap_attachment(buf->db_attach, sgt, buf->dma_dir); | |
662 | ||
663 | buf->dma_sgt = NULL; | |
664 | } | |
665 | ||
666 | static void vb2_dma_sg_detach_dmabuf(void *mem_priv) | |
667 | { | |
668 | struct vb2_dma_sg_buf *buf = mem_priv; | |
669 | ||
670 | /* if vb2 works correctly you should never detach mapped buffer */ | |
671 | if (WARN_ON(buf->dma_sgt)) | |
672 | vb2_dma_sg_unmap_dmabuf(buf); | |
673 | ||
674 | /* detach this attachment */ | |
675 | dma_buf_detach(buf->db_attach->dmabuf, buf->db_attach); | |
676 | kfree(buf); | |
677 | } | |
678 | ||
679 | static void *vb2_dma_sg_attach_dmabuf(void *alloc_ctx, struct dma_buf *dbuf, | |
680 | unsigned long size, enum dma_data_direction dma_dir) | |
681 | { | |
682 | struct vb2_dma_sg_conf *conf = alloc_ctx; | |
683 | struct vb2_dma_sg_buf *buf; | |
684 | struct dma_buf_attachment *dba; | |
685 | ||
686 | if (dbuf->size < size) | |
687 | return ERR_PTR(-EFAULT); | |
688 | ||
689 | buf = kzalloc(sizeof(*buf), GFP_KERNEL); | |
690 | if (!buf) | |
691 | return ERR_PTR(-ENOMEM); | |
692 | ||
693 | buf->dev = conf->dev; | |
694 | /* create attachment for the dmabuf with the user device */ | |
695 | dba = dma_buf_attach(dbuf, buf->dev); | |
696 | if (IS_ERR(dba)) { | |
697 | pr_err("failed to attach dmabuf\n"); | |
698 | kfree(buf); | |
699 | return dba; | |
700 | } | |
701 | ||
702 | buf->dma_dir = dma_dir; | |
703 | buf->size = size; | |
704 | buf->db_attach = dba; | |
705 | ||
706 | return buf; | |
707 | } | |
708 | ||
5ba3f757 AP |
709 | static void *vb2_dma_sg_cookie(void *buf_priv) |
710 | { | |
711 | struct vb2_dma_sg_buf *buf = buf_priv; | |
712 | ||
e078b79d | 713 | return buf->dma_sgt; |
5ba3f757 AP |
714 | } |
715 | ||
716 | const struct vb2_mem_ops vb2_dma_sg_memops = { | |
717 | .alloc = vb2_dma_sg_alloc, | |
718 | .put = vb2_dma_sg_put, | |
719 | .get_userptr = vb2_dma_sg_get_userptr, | |
720 | .put_userptr = vb2_dma_sg_put_userptr, | |
d790b7ed HV |
721 | .prepare = vb2_dma_sg_prepare, |
722 | .finish = vb2_dma_sg_finish, | |
5ba3f757 AP |
723 | .vaddr = vb2_dma_sg_vaddr, |
724 | .mmap = vb2_dma_sg_mmap, | |
725 | .num_users = vb2_dma_sg_num_users, | |
041c7b6a | 726 | .get_dmabuf = vb2_dma_sg_get_dmabuf, |
e078b79d HV |
727 | .map_dmabuf = vb2_dma_sg_map_dmabuf, |
728 | .unmap_dmabuf = vb2_dma_sg_unmap_dmabuf, | |
729 | .attach_dmabuf = vb2_dma_sg_attach_dmabuf, | |
730 | .detach_dmabuf = vb2_dma_sg_detach_dmabuf, | |
5ba3f757 AP |
731 | .cookie = vb2_dma_sg_cookie, |
732 | }; | |
733 | EXPORT_SYMBOL_GPL(vb2_dma_sg_memops); | |
734 | ||
0c3a14c1 HV |
735 | void *vb2_dma_sg_init_ctx(struct device *dev) |
736 | { | |
737 | struct vb2_dma_sg_conf *conf; | |
738 | ||
739 | conf = kzalloc(sizeof(*conf), GFP_KERNEL); | |
740 | if (!conf) | |
741 | return ERR_PTR(-ENOMEM); | |
742 | ||
743 | conf->dev = dev; | |
744 | ||
745 | return conf; | |
746 | } | |
747 | EXPORT_SYMBOL_GPL(vb2_dma_sg_init_ctx); | |
748 | ||
749 | void vb2_dma_sg_cleanup_ctx(void *alloc_ctx) | |
750 | { | |
751 | if (!IS_ERR_OR_NULL(alloc_ctx)) | |
752 | kfree(alloc_ctx); | |
753 | } | |
754 | EXPORT_SYMBOL_GPL(vb2_dma_sg_cleanup_ctx); | |
755 | ||
5ba3f757 AP |
756 | MODULE_DESCRIPTION("dma scatter/gather memory handling routines for videobuf2"); |
757 | MODULE_AUTHOR("Andrzej Pietrasiewicz"); | |
758 | MODULE_LICENSE("GPL"); |