Commit | Line | Data |
---|---|---|
3c18ff06 PO |
1 | /* |
2 | * videobuf2-vmalloc.c - vmalloc memory allocator for videobuf2 | |
3 | * | |
4 | * Copyright (C) 2010 Samsung Electronics | |
5 | * | |
95072084 | 6 | * Author: Pawel Osciak <pawel@osciak.com> |
3c18ff06 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 | ||
570d2a48 | 13 | #include <linux/io.h> |
3c18ff06 PO |
14 | #include <linux/module.h> |
15 | #include <linux/mm.h> | |
4419b8ac | 16 | #include <linux/sched.h> |
3c18ff06 PO |
17 | #include <linux/slab.h> |
18 | #include <linux/vmalloc.h> | |
19 | ||
c139990e | 20 | #include <media/videobuf2-v4l2.h> |
ddb9fa25 | 21 | #include <media/videobuf2-vmalloc.h> |
3c18ff06 PO |
22 | #include <media/videobuf2-memops.h> |
23 | ||
24 | struct vb2_vmalloc_buf { | |
25 | void *vaddr; | |
5a9e4dec | 26 | struct frame_vector *vec; |
cd474037 | 27 | enum dma_data_direction dma_dir; |
3c18ff06 PO |
28 | unsigned long size; |
29 | atomic_t refcount; | |
30 | struct vb2_vmarea_handler handler; | |
89d2ee08 | 31 | struct dma_buf *dbuf; |
3c18ff06 PO |
32 | }; |
33 | ||
34 | static void vb2_vmalloc_put(void *buf_priv); | |
35 | ||
00085f1e | 36 | static void *vb2_vmalloc_alloc(struct device *dev, unsigned long attrs, |
d16e832d HV |
37 | unsigned long size, enum dma_data_direction dma_dir, |
38 | gfp_t gfp_flags) | |
3c18ff06 PO |
39 | { |
40 | struct vb2_vmalloc_buf *buf; | |
41 | ||
b6ba2057 | 42 | buf = kzalloc(sizeof(*buf), GFP_KERNEL | gfp_flags); |
3c18ff06 PO |
43 | if (!buf) |
44 | return NULL; | |
45 | ||
46 | buf->size = size; | |
47 | buf->vaddr = vmalloc_user(buf->size); | |
d935c57e | 48 | buf->dma_dir = dma_dir; |
3c18ff06 PO |
49 | buf->handler.refcount = &buf->refcount; |
50 | buf->handler.put = vb2_vmalloc_put; | |
51 | buf->handler.arg = buf; | |
52 | ||
53 | if (!buf->vaddr) { | |
4419b8ac | 54 | pr_debug("vmalloc of size %ld failed\n", buf->size); |
3c18ff06 PO |
55 | kfree(buf); |
56 | return NULL; | |
57 | } | |
58 | ||
59 | atomic_inc(&buf->refcount); | |
3c18ff06 PO |
60 | return buf; |
61 | } | |
62 | ||
63 | static void vb2_vmalloc_put(void *buf_priv) | |
64 | { | |
65 | struct vb2_vmalloc_buf *buf = buf_priv; | |
66 | ||
67 | if (atomic_dec_and_test(&buf->refcount)) { | |
3c18ff06 PO |
68 | vfree(buf->vaddr); |
69 | kfree(buf); | |
70 | } | |
71 | } | |
72 | ||
36c0f8b3 | 73 | static void *vb2_vmalloc_get_userptr(struct device *dev, unsigned long vaddr, |
cd474037 HV |
74 | unsigned long size, |
75 | enum dma_data_direction dma_dir) | |
4419b8ac AP |
76 | { |
77 | struct vb2_vmalloc_buf *buf; | |
5a9e4dec JK |
78 | struct frame_vector *vec; |
79 | int n_pages, offset, i; | |
4419b8ac AP |
80 | |
81 | buf = kzalloc(sizeof(*buf), GFP_KERNEL); | |
82 | if (!buf) | |
83 | return NULL; | |
84 | ||
cd474037 | 85 | buf->dma_dir = dma_dir; |
4419b8ac AP |
86 | offset = vaddr & ~PAGE_MASK; |
87 | buf->size = size; | |
5a9e4dec JK |
88 | vec = vb2_create_framevec(vaddr, size, dma_dir == DMA_FROM_DEVICE); |
89 | if (IS_ERR(vec)) | |
90 | goto fail_pfnvec_create; | |
91 | buf->vec = vec; | |
92 | n_pages = frame_vector_count(vec); | |
93 | if (frame_vector_to_pages(vec) < 0) { | |
94 | unsigned long *nums = frame_vector_pfns(vec); | |
95 | ||
96 | /* | |
97 | * We cannot get page pointers for these pfns. Check memory is | |
98 | * physically contiguous and use direct mapping. | |
99 | */ | |
100 | for (i = 1; i < n_pages; i++) | |
101 | if (nums[i-1] + 1 != nums[i]) | |
102 | goto fail_map; | |
103 | buf->vaddr = (__force void *) | |
104 | ioremap_nocache(nums[0] << PAGE_SHIFT, size); | |
570d2a48 | 105 | } else { |
5a9e4dec | 106 | buf->vaddr = vm_map_ram(frame_vector_pages(vec), n_pages, -1, |
570d2a48 | 107 | PAGE_KERNEL); |
570d2a48 | 108 | } |
4419b8ac | 109 | |
5a9e4dec JK |
110 | if (!buf->vaddr) |
111 | goto fail_map; | |
4419b8ac AP |
112 | buf->vaddr += offset; |
113 | return buf; | |
114 | ||
5a9e4dec JK |
115 | fail_map: |
116 | vb2_destroy_framevec(vec); | |
117 | fail_pfnvec_create: | |
4419b8ac AP |
118 | kfree(buf); |
119 | ||
120 | return NULL; | |
121 | } | |
122 | ||
123 | static void vb2_vmalloc_put_userptr(void *buf_priv) | |
3c18ff06 PO |
124 | { |
125 | struct vb2_vmalloc_buf *buf = buf_priv; | |
4419b8ac AP |
126 | unsigned long vaddr = (unsigned long)buf->vaddr & PAGE_MASK; |
127 | unsigned int i; | |
5a9e4dec JK |
128 | struct page **pages; |
129 | unsigned int n_pages; | |
4419b8ac | 130 | |
5a9e4dec JK |
131 | if (!buf->vec->is_pfns) { |
132 | n_pages = frame_vector_count(buf->vec); | |
133 | pages = frame_vector_pages(buf->vec); | |
570d2a48 | 134 | if (vaddr) |
5a9e4dec JK |
135 | vm_unmap_ram((void *)vaddr, n_pages); |
136 | if (buf->dma_dir == DMA_FROM_DEVICE) | |
137 | for (i = 0; i < n_pages; i++) | |
138 | set_page_dirty_lock(pages[i]); | |
570d2a48 | 139 | } else { |
7c424dd1 | 140 | iounmap((__force void __iomem *)buf->vaddr); |
4419b8ac | 141 | } |
5a9e4dec | 142 | vb2_destroy_framevec(buf->vec); |
4419b8ac AP |
143 | kfree(buf); |
144 | } | |
3c18ff06 | 145 | |
4419b8ac AP |
146 | static void *vb2_vmalloc_vaddr(void *buf_priv) |
147 | { | |
148 | struct vb2_vmalloc_buf *buf = buf_priv; | |
3c18ff06 PO |
149 | |
150 | if (!buf->vaddr) { | |
4419b8ac AP |
151 | pr_err("Address of an unallocated plane requested " |
152 | "or cannot map user pointer\n"); | |
3c18ff06 PO |
153 | return NULL; |
154 | } | |
155 | ||
156 | return buf->vaddr; | |
157 | } | |
158 | ||
159 | static unsigned int vb2_vmalloc_num_users(void *buf_priv) | |
160 | { | |
161 | struct vb2_vmalloc_buf *buf = buf_priv; | |
162 | return atomic_read(&buf->refcount); | |
163 | } | |
164 | ||
165 | static int vb2_vmalloc_mmap(void *buf_priv, struct vm_area_struct *vma) | |
166 | { | |
167 | struct vb2_vmalloc_buf *buf = buf_priv; | |
168 | int ret; | |
169 | ||
170 | if (!buf) { | |
4419b8ac | 171 | pr_err("No memory to map\n"); |
3c18ff06 PO |
172 | return -EINVAL; |
173 | } | |
174 | ||
175 | ret = remap_vmalloc_range(vma, buf->vaddr, 0); | |
176 | if (ret) { | |
4419b8ac | 177 | pr_err("Remapping vmalloc memory, error: %d\n", ret); |
3c18ff06 PO |
178 | return ret; |
179 | } | |
180 | ||
181 | /* | |
182 | * Make sure that vm_areas for 2 buffers won't be merged together | |
183 | */ | |
184 | vma->vm_flags |= VM_DONTEXPAND; | |
185 | ||
186 | /* | |
187 | * Use common vm_area operations to track buffer refcount. | |
188 | */ | |
189 | vma->vm_private_data = &buf->handler; | |
190 | vma->vm_ops = &vb2_common_vm_ops; | |
191 | ||
192 | vma->vm_ops->open(vma); | |
193 | ||
194 | return 0; | |
195 | } | |
196 | ||
99f3cd52 | 197 | #ifdef CONFIG_HAS_DMA |
46506350 HV |
198 | /*********************************************/ |
199 | /* DMABUF ops for exporters */ | |
200 | /*********************************************/ | |
201 | ||
202 | struct vb2_vmalloc_attachment { | |
203 | struct sg_table sgt; | |
204 | enum dma_data_direction dma_dir; | |
205 | }; | |
206 | ||
207 | static int vb2_vmalloc_dmabuf_ops_attach(struct dma_buf *dbuf, struct device *dev, | |
208 | struct dma_buf_attachment *dbuf_attach) | |
209 | { | |
210 | struct vb2_vmalloc_attachment *attach; | |
211 | struct vb2_vmalloc_buf *buf = dbuf->priv; | |
212 | int num_pages = PAGE_ALIGN(buf->size) / PAGE_SIZE; | |
213 | struct sg_table *sgt; | |
214 | struct scatterlist *sg; | |
215 | void *vaddr = buf->vaddr; | |
216 | int ret; | |
217 | int i; | |
218 | ||
219 | attach = kzalloc(sizeof(*attach), GFP_KERNEL); | |
220 | if (!attach) | |
221 | return -ENOMEM; | |
222 | ||
223 | sgt = &attach->sgt; | |
224 | ret = sg_alloc_table(sgt, num_pages, GFP_KERNEL); | |
225 | if (ret) { | |
226 | kfree(attach); | |
227 | return ret; | |
228 | } | |
229 | for_each_sg(sgt->sgl, sg, sgt->nents, i) { | |
230 | struct page *page = vmalloc_to_page(vaddr); | |
231 | ||
232 | if (!page) { | |
233 | sg_free_table(sgt); | |
234 | kfree(attach); | |
235 | return -ENOMEM; | |
236 | } | |
237 | sg_set_page(sg, page, PAGE_SIZE, 0); | |
238 | vaddr += PAGE_SIZE; | |
239 | } | |
240 | ||
241 | attach->dma_dir = DMA_NONE; | |
242 | dbuf_attach->priv = attach; | |
243 | return 0; | |
244 | } | |
245 | ||
246 | static void vb2_vmalloc_dmabuf_ops_detach(struct dma_buf *dbuf, | |
247 | struct dma_buf_attachment *db_attach) | |
248 | { | |
249 | struct vb2_vmalloc_attachment *attach = db_attach->priv; | |
250 | struct sg_table *sgt; | |
251 | ||
252 | if (!attach) | |
253 | return; | |
254 | ||
255 | sgt = &attach->sgt; | |
256 | ||
257 | /* release the scatterlist cache */ | |
258 | if (attach->dma_dir != DMA_NONE) | |
259 | dma_unmap_sg(db_attach->dev, sgt->sgl, sgt->orig_nents, | |
260 | attach->dma_dir); | |
261 | sg_free_table(sgt); | |
262 | kfree(attach); | |
263 | db_attach->priv = NULL; | |
264 | } | |
265 | ||
266 | static struct sg_table *vb2_vmalloc_dmabuf_ops_map( | |
267 | struct dma_buf_attachment *db_attach, enum dma_data_direction dma_dir) | |
268 | { | |
269 | struct vb2_vmalloc_attachment *attach = db_attach->priv; | |
270 | /* stealing dmabuf mutex to serialize map/unmap operations */ | |
271 | struct mutex *lock = &db_attach->dmabuf->lock; | |
272 | struct sg_table *sgt; | |
46506350 HV |
273 | |
274 | mutex_lock(lock); | |
275 | ||
276 | sgt = &attach->sgt; | |
277 | /* return previously mapped sg table */ | |
278 | if (attach->dma_dir == dma_dir) { | |
279 | mutex_unlock(lock); | |
280 | return sgt; | |
281 | } | |
282 | ||
283 | /* release any previous cache */ | |
284 | if (attach->dma_dir != DMA_NONE) { | |
285 | dma_unmap_sg(db_attach->dev, sgt->sgl, sgt->orig_nents, | |
286 | attach->dma_dir); | |
287 | attach->dma_dir = DMA_NONE; | |
288 | } | |
289 | ||
290 | /* mapping to the client with new direction */ | |
ba81c6ed RR |
291 | sgt->nents = dma_map_sg(db_attach->dev, sgt->sgl, sgt->orig_nents, |
292 | dma_dir); | |
293 | if (!sgt->nents) { | |
46506350 HV |
294 | pr_err("failed to map scatterlist\n"); |
295 | mutex_unlock(lock); | |
296 | return ERR_PTR(-EIO); | |
297 | } | |
298 | ||
299 | attach->dma_dir = dma_dir; | |
300 | ||
301 | mutex_unlock(lock); | |
302 | ||
303 | return sgt; | |
304 | } | |
305 | ||
306 | static void vb2_vmalloc_dmabuf_ops_unmap(struct dma_buf_attachment *db_attach, | |
307 | struct sg_table *sgt, enum dma_data_direction dma_dir) | |
308 | { | |
309 | /* nothing to be done here */ | |
310 | } | |
311 | ||
312 | static void vb2_vmalloc_dmabuf_ops_release(struct dma_buf *dbuf) | |
313 | { | |
314 | /* drop reference obtained in vb2_vmalloc_get_dmabuf */ | |
315 | vb2_vmalloc_put(dbuf->priv); | |
316 | } | |
317 | ||
318 | static void *vb2_vmalloc_dmabuf_ops_kmap(struct dma_buf *dbuf, unsigned long pgnum) | |
319 | { | |
320 | struct vb2_vmalloc_buf *buf = dbuf->priv; | |
321 | ||
322 | return buf->vaddr + pgnum * PAGE_SIZE; | |
323 | } | |
324 | ||
325 | static void *vb2_vmalloc_dmabuf_ops_vmap(struct dma_buf *dbuf) | |
326 | { | |
327 | struct vb2_vmalloc_buf *buf = dbuf->priv; | |
328 | ||
329 | return buf->vaddr; | |
330 | } | |
331 | ||
332 | static int vb2_vmalloc_dmabuf_ops_mmap(struct dma_buf *dbuf, | |
333 | struct vm_area_struct *vma) | |
334 | { | |
335 | return vb2_vmalloc_mmap(dbuf->priv, vma); | |
336 | } | |
337 | ||
338 | static struct dma_buf_ops vb2_vmalloc_dmabuf_ops = { | |
339 | .attach = vb2_vmalloc_dmabuf_ops_attach, | |
340 | .detach = vb2_vmalloc_dmabuf_ops_detach, | |
341 | .map_dma_buf = vb2_vmalloc_dmabuf_ops_map, | |
342 | .unmap_dma_buf = vb2_vmalloc_dmabuf_ops_unmap, | |
343 | .kmap = vb2_vmalloc_dmabuf_ops_kmap, | |
344 | .kmap_atomic = vb2_vmalloc_dmabuf_ops_kmap, | |
345 | .vmap = vb2_vmalloc_dmabuf_ops_vmap, | |
346 | .mmap = vb2_vmalloc_dmabuf_ops_mmap, | |
347 | .release = vb2_vmalloc_dmabuf_ops_release, | |
348 | }; | |
349 | ||
350 | static struct dma_buf *vb2_vmalloc_get_dmabuf(void *buf_priv, unsigned long flags) | |
351 | { | |
352 | struct vb2_vmalloc_buf *buf = buf_priv; | |
353 | struct dma_buf *dbuf; | |
d8fbe341 SS |
354 | DEFINE_DMA_BUF_EXPORT_INFO(exp_info); |
355 | ||
356 | exp_info.ops = &vb2_vmalloc_dmabuf_ops; | |
357 | exp_info.size = buf->size; | |
358 | exp_info.flags = flags; | |
359 | exp_info.priv = buf; | |
46506350 HV |
360 | |
361 | if (WARN_ON(!buf->vaddr)) | |
362 | return NULL; | |
363 | ||
d8fbe341 | 364 | dbuf = dma_buf_export(&exp_info); |
46506350 HV |
365 | if (IS_ERR(dbuf)) |
366 | return NULL; | |
367 | ||
368 | /* dmabuf keeps reference to vb2 buffer */ | |
369 | atomic_inc(&buf->refcount); | |
370 | ||
371 | return dbuf; | |
372 | } | |
99f3cd52 GU |
373 | #endif /* CONFIG_HAS_DMA */ |
374 | ||
46506350 | 375 | |
89d2ee08 TS |
376 | /*********************************************/ |
377 | /* callbacks for DMABUF buffers */ | |
378 | /*********************************************/ | |
379 | ||
380 | static int vb2_vmalloc_map_dmabuf(void *mem_priv) | |
381 | { | |
382 | struct vb2_vmalloc_buf *buf = mem_priv; | |
383 | ||
384 | buf->vaddr = dma_buf_vmap(buf->dbuf); | |
385 | ||
386 | return buf->vaddr ? 0 : -EFAULT; | |
387 | } | |
388 | ||
389 | static void vb2_vmalloc_unmap_dmabuf(void *mem_priv) | |
390 | { | |
391 | struct vb2_vmalloc_buf *buf = mem_priv; | |
392 | ||
393 | dma_buf_vunmap(buf->dbuf, buf->vaddr); | |
394 | buf->vaddr = NULL; | |
395 | } | |
396 | ||
397 | static void vb2_vmalloc_detach_dmabuf(void *mem_priv) | |
398 | { | |
399 | struct vb2_vmalloc_buf *buf = mem_priv; | |
400 | ||
401 | if (buf->vaddr) | |
402 | dma_buf_vunmap(buf->dbuf, buf->vaddr); | |
403 | ||
404 | kfree(buf); | |
405 | } | |
406 | ||
36c0f8b3 | 407 | static void *vb2_vmalloc_attach_dmabuf(struct device *dev, struct dma_buf *dbuf, |
cd474037 | 408 | unsigned long size, enum dma_data_direction dma_dir) |
89d2ee08 TS |
409 | { |
410 | struct vb2_vmalloc_buf *buf; | |
411 | ||
412 | if (dbuf->size < size) | |
413 | return ERR_PTR(-EFAULT); | |
414 | ||
415 | buf = kzalloc(sizeof(*buf), GFP_KERNEL); | |
416 | if (!buf) | |
417 | return ERR_PTR(-ENOMEM); | |
418 | ||
419 | buf->dbuf = dbuf; | |
cd474037 | 420 | buf->dma_dir = dma_dir; |
89d2ee08 TS |
421 | buf->size = size; |
422 | ||
423 | return buf; | |
424 | } | |
425 | ||
426 | ||
3c18ff06 PO |
427 | const struct vb2_mem_ops vb2_vmalloc_memops = { |
428 | .alloc = vb2_vmalloc_alloc, | |
429 | .put = vb2_vmalloc_put, | |
4419b8ac AP |
430 | .get_userptr = vb2_vmalloc_get_userptr, |
431 | .put_userptr = vb2_vmalloc_put_userptr, | |
99f3cd52 | 432 | #ifdef CONFIG_HAS_DMA |
46506350 | 433 | .get_dmabuf = vb2_vmalloc_get_dmabuf, |
99f3cd52 | 434 | #endif |
89d2ee08 TS |
435 | .map_dmabuf = vb2_vmalloc_map_dmabuf, |
436 | .unmap_dmabuf = vb2_vmalloc_unmap_dmabuf, | |
437 | .attach_dmabuf = vb2_vmalloc_attach_dmabuf, | |
438 | .detach_dmabuf = vb2_vmalloc_detach_dmabuf, | |
3c18ff06 PO |
439 | .vaddr = vb2_vmalloc_vaddr, |
440 | .mmap = vb2_vmalloc_mmap, | |
441 | .num_users = vb2_vmalloc_num_users, | |
442 | }; | |
443 | EXPORT_SYMBOL_GPL(vb2_vmalloc_memops); | |
444 | ||
445 | MODULE_DESCRIPTION("vmalloc memory handling routines for videobuf2"); | |
95072084 | 446 | MODULE_AUTHOR("Pawel Osciak <pawel@osciak.com>"); |
3c18ff06 | 447 | MODULE_LICENSE("GPL"); |