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13#include <linux/io.h>
14#include <linux/module.h>
15#include <linux/mm.h>
16#include <linux/refcount.h>
17#include <linux/sched.h>
18#include <linux/slab.h>
19#include <linux/vmalloc.h>
20
21#include <media/videobuf2-v4l2.h>
22#include <media/videobuf2-vmalloc.h>
23#include <media/videobuf2-memops.h>
24
25struct vb2_vmalloc_buf {
26 void *vaddr;
27 struct frame_vector *vec;
28 enum dma_data_direction dma_dir;
29 unsigned long size;
30 refcount_t refcount;
31 struct vb2_vmarea_handler handler;
32 struct dma_buf *dbuf;
33};
34
35static void vb2_vmalloc_put(void *buf_priv);
36
37static void *vb2_vmalloc_alloc(struct device *dev, unsigned long attrs,
38 unsigned long size, enum dma_data_direction dma_dir,
39 gfp_t gfp_flags)
40{
41 struct vb2_vmalloc_buf *buf;
42
43 buf = kzalloc(sizeof(*buf), GFP_KERNEL | gfp_flags);
44 if (!buf)
45 return ERR_PTR(-ENOMEM);
46
47 buf->size = size;
48 buf->vaddr = vmalloc_user(buf->size);
49 buf->dma_dir = dma_dir;
50 buf->handler.refcount = &buf->refcount;
51 buf->handler.put = vb2_vmalloc_put;
52 buf->handler.arg = buf;
53
54 if (!buf->vaddr) {
55 pr_debug("vmalloc of size %ld failed\n", buf->size);
56 kfree(buf);
57 return ERR_PTR(-ENOMEM);
58 }
59
60 refcount_set(&buf->refcount, 1);
61 return buf;
62}
63
64static void vb2_vmalloc_put(void *buf_priv)
65{
66 struct vb2_vmalloc_buf *buf = buf_priv;
67
68 if (refcount_dec_and_test(&buf->refcount)) {
69 vfree(buf->vaddr);
70 kfree(buf);
71 }
72}
73
74static void *vb2_vmalloc_get_userptr(struct device *dev, unsigned long vaddr,
75 unsigned long size,
76 enum dma_data_direction dma_dir)
77{
78 struct vb2_vmalloc_buf *buf;
79 struct frame_vector *vec;
80 int n_pages, offset, i;
81 int ret = -ENOMEM;
82
83 buf = kzalloc(sizeof(*buf), GFP_KERNEL);
84 if (!buf)
85 return ERR_PTR(-ENOMEM);
86
87 buf->dma_dir = dma_dir;
88 offset = vaddr & ~PAGE_MASK;
89 buf->size = size;
90 vec = vb2_create_framevec(vaddr, size, dma_dir == DMA_FROM_DEVICE ||
91 dma_dir == DMA_BIDIRECTIONAL);
92 if (IS_ERR(vec)) {
93 ret = PTR_ERR(vec);
94 goto fail_pfnvec_create;
95 }
96 buf->vec = vec;
97 n_pages = frame_vector_count(vec);
98 if (frame_vector_to_pages(vec) < 0) {
99 unsigned long *nums = frame_vector_pfns(vec);
100
101
102
103
104
105 for (i = 1; i < n_pages; i++)
106 if (nums[i-1] + 1 != nums[i])
107 goto fail_map;
108 buf->vaddr = (__force void *)
109 ioremap_nocache(__pfn_to_phys(nums[0]), size + offset);
110 } else {
111 buf->vaddr = vm_map_ram(frame_vector_pages(vec), n_pages, -1,
112 PAGE_KERNEL);
113 }
114
115 if (!buf->vaddr)
116 goto fail_map;
117 buf->vaddr += offset;
118 return buf;
119
120fail_map:
121 vb2_destroy_framevec(vec);
122fail_pfnvec_create:
123 kfree(buf);
124
125 return ERR_PTR(ret);
126}
127
128static void vb2_vmalloc_put_userptr(void *buf_priv)
129{
130 struct vb2_vmalloc_buf *buf = buf_priv;
131 unsigned long vaddr = (unsigned long)buf->vaddr & PAGE_MASK;
132 unsigned int i;
133 struct page **pages;
134 unsigned int n_pages;
135
136 if (!buf->vec->is_pfns) {
137 n_pages = frame_vector_count(buf->vec);
138 pages = frame_vector_pages(buf->vec);
139 if (vaddr)
140 vm_unmap_ram((void *)vaddr, n_pages);
141 if (buf->dma_dir == DMA_FROM_DEVICE ||
142 buf->dma_dir == DMA_BIDIRECTIONAL)
143 for (i = 0; i < n_pages; i++)
144 set_page_dirty_lock(pages[i]);
145 } else {
146 iounmap((__force void __iomem *)buf->vaddr);
147 }
148 vb2_destroy_framevec(buf->vec);
149 kfree(buf);
150}
151
152static void *vb2_vmalloc_vaddr(void *buf_priv)
153{
154 struct vb2_vmalloc_buf *buf = buf_priv;
155
156 if (!buf->vaddr) {
157 pr_err("Address of an unallocated plane requested or cannot map user pointer\n");
158 return NULL;
159 }
160
161 return buf->vaddr;
162}
163
164static unsigned int vb2_vmalloc_num_users(void *buf_priv)
165{
166 struct vb2_vmalloc_buf *buf = buf_priv;
167 return refcount_read(&buf->refcount);
168}
169
170static int vb2_vmalloc_mmap(void *buf_priv, struct vm_area_struct *vma)
171{
172 struct vb2_vmalloc_buf *buf = buf_priv;
173 int ret;
174
175 if (!buf) {
176 pr_err("No memory to map\n");
177 return -EINVAL;
178 }
179
180 ret = remap_vmalloc_range(vma, buf->vaddr, 0);
181 if (ret) {
182 pr_err("Remapping vmalloc memory, error: %d\n", ret);
183 return ret;
184 }
185
186
187
188
189 vma->vm_flags |= VM_DONTEXPAND;
190
191
192
193
194 vma->vm_private_data = &buf->handler;
195 vma->vm_ops = &vb2_common_vm_ops;
196
197 vma->vm_ops->open(vma);
198
199 return 0;
200}
201
202#ifdef CONFIG_HAS_DMA
203
204
205
206
207struct vb2_vmalloc_attachment {
208 struct sg_table sgt;
209 enum dma_data_direction dma_dir;
210};
211
212static int vb2_vmalloc_dmabuf_ops_attach(struct dma_buf *dbuf, struct device *dev,
213 struct dma_buf_attachment *dbuf_attach)
214{
215 struct vb2_vmalloc_attachment *attach;
216 struct vb2_vmalloc_buf *buf = dbuf->priv;
217 int num_pages = PAGE_ALIGN(buf->size) / PAGE_SIZE;
218 struct sg_table *sgt;
219 struct scatterlist *sg;
220 void *vaddr = buf->vaddr;
221 int ret;
222 int i;
223
224 attach = kzalloc(sizeof(*attach), GFP_KERNEL);
225 if (!attach)
226 return -ENOMEM;
227
228 sgt = &attach->sgt;
229 ret = sg_alloc_table(sgt, num_pages, GFP_KERNEL);
230 if (ret) {
231 kfree(attach);
232 return ret;
233 }
234 for_each_sg(sgt->sgl, sg, sgt->nents, i) {
235 struct page *page = vmalloc_to_page(vaddr);
236
237 if (!page) {
238 sg_free_table(sgt);
239 kfree(attach);
240 return -ENOMEM;
241 }
242 sg_set_page(sg, page, PAGE_SIZE, 0);
243 vaddr += PAGE_SIZE;
244 }
245
246 attach->dma_dir = DMA_NONE;
247 dbuf_attach->priv = attach;
248 return 0;
249}
250
251static void vb2_vmalloc_dmabuf_ops_detach(struct dma_buf *dbuf,
252 struct dma_buf_attachment *db_attach)
253{
254 struct vb2_vmalloc_attachment *attach = db_attach->priv;
255 struct sg_table *sgt;
256
257 if (!attach)
258 return;
259
260 sgt = &attach->sgt;
261
262
263 if (attach->dma_dir != DMA_NONE)
264 dma_unmap_sg(db_attach->dev, sgt->sgl, sgt->orig_nents,
265 attach->dma_dir);
266 sg_free_table(sgt);
267 kfree(attach);
268 db_attach->priv = NULL;
269}
270
271static struct sg_table *vb2_vmalloc_dmabuf_ops_map(
272 struct dma_buf_attachment *db_attach, enum dma_data_direction dma_dir)
273{
274 struct vb2_vmalloc_attachment *attach = db_attach->priv;
275
276 struct mutex *lock = &db_attach->dmabuf->lock;
277 struct sg_table *sgt;
278
279 mutex_lock(lock);
280
281 sgt = &attach->sgt;
282
283 if (attach->dma_dir == dma_dir) {
284 mutex_unlock(lock);
285 return sgt;
286 }
287
288
289 if (attach->dma_dir != DMA_NONE) {
290 dma_unmap_sg(db_attach->dev, sgt->sgl, sgt->orig_nents,
291 attach->dma_dir);
292 attach->dma_dir = DMA_NONE;
293 }
294
295
296 sgt->nents = dma_map_sg(db_attach->dev, sgt->sgl, sgt->orig_nents,
297 dma_dir);
298 if (!sgt->nents) {
299 pr_err("failed to map scatterlist\n");
300 mutex_unlock(lock);
301 return ERR_PTR(-EIO);
302 }
303
304 attach->dma_dir = dma_dir;
305
306 mutex_unlock(lock);
307
308 return sgt;
309}
310
311static void vb2_vmalloc_dmabuf_ops_unmap(struct dma_buf_attachment *db_attach,
312 struct sg_table *sgt, enum dma_data_direction dma_dir)
313{
314
315}
316
317static void vb2_vmalloc_dmabuf_ops_release(struct dma_buf *dbuf)
318{
319
320 vb2_vmalloc_put(dbuf->priv);
321}
322
323static void *vb2_vmalloc_dmabuf_ops_kmap(struct dma_buf *dbuf, unsigned long pgnum)
324{
325 struct vb2_vmalloc_buf *buf = dbuf->priv;
326
327 return buf->vaddr + pgnum * PAGE_SIZE;
328}
329
330static void *vb2_vmalloc_dmabuf_ops_vmap(struct dma_buf *dbuf)
331{
332 struct vb2_vmalloc_buf *buf = dbuf->priv;
333
334 return buf->vaddr;
335}
336
337static int vb2_vmalloc_dmabuf_ops_mmap(struct dma_buf *dbuf,
338 struct vm_area_struct *vma)
339{
340 return vb2_vmalloc_mmap(dbuf->priv, vma);
341}
342
343static const struct dma_buf_ops vb2_vmalloc_dmabuf_ops = {
344 .attach = vb2_vmalloc_dmabuf_ops_attach,
345 .detach = vb2_vmalloc_dmabuf_ops_detach,
346 .map_dma_buf = vb2_vmalloc_dmabuf_ops_map,
347 .unmap_dma_buf = vb2_vmalloc_dmabuf_ops_unmap,
348 .map = vb2_vmalloc_dmabuf_ops_kmap,
349 .map_atomic = vb2_vmalloc_dmabuf_ops_kmap,
350 .vmap = vb2_vmalloc_dmabuf_ops_vmap,
351 .mmap = vb2_vmalloc_dmabuf_ops_mmap,
352 .release = vb2_vmalloc_dmabuf_ops_release,
353};
354
355static struct dma_buf *vb2_vmalloc_get_dmabuf(void *buf_priv, unsigned long flags)
356{
357 struct vb2_vmalloc_buf *buf = buf_priv;
358 struct dma_buf *dbuf;
359 DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
360
361 exp_info.ops = &vb2_vmalloc_dmabuf_ops;
362 exp_info.size = buf->size;
363 exp_info.flags = flags;
364 exp_info.priv = buf;
365
366 if (WARN_ON(!buf->vaddr))
367 return NULL;
368
369 dbuf = dma_buf_export(&exp_info);
370 if (IS_ERR(dbuf))
371 return NULL;
372
373
374 refcount_inc(&buf->refcount);
375
376 return dbuf;
377}
378#endif
379
380
381
382
383
384
385static int vb2_vmalloc_map_dmabuf(void *mem_priv)
386{
387 struct vb2_vmalloc_buf *buf = mem_priv;
388
389 buf->vaddr = dma_buf_vmap(buf->dbuf);
390
391 return buf->vaddr ? 0 : -EFAULT;
392}
393
394static void vb2_vmalloc_unmap_dmabuf(void *mem_priv)
395{
396 struct vb2_vmalloc_buf *buf = mem_priv;
397
398 dma_buf_vunmap(buf->dbuf, buf->vaddr);
399 buf->vaddr = NULL;
400}
401
402static void vb2_vmalloc_detach_dmabuf(void *mem_priv)
403{
404 struct vb2_vmalloc_buf *buf = mem_priv;
405
406 if (buf->vaddr)
407 dma_buf_vunmap(buf->dbuf, buf->vaddr);
408
409 kfree(buf);
410}
411
412static void *vb2_vmalloc_attach_dmabuf(struct device *dev, struct dma_buf *dbuf,
413 unsigned long size, enum dma_data_direction dma_dir)
414{
415 struct vb2_vmalloc_buf *buf;
416
417 if (dbuf->size < size)
418 return ERR_PTR(-EFAULT);
419
420 buf = kzalloc(sizeof(*buf), GFP_KERNEL);
421 if (!buf)
422 return ERR_PTR(-ENOMEM);
423
424 buf->dbuf = dbuf;
425 buf->dma_dir = dma_dir;
426 buf->size = size;
427
428 return buf;
429}
430
431
432const struct vb2_mem_ops vb2_vmalloc_memops = {
433 .alloc = vb2_vmalloc_alloc,
434 .put = vb2_vmalloc_put,
435 .get_userptr = vb2_vmalloc_get_userptr,
436 .put_userptr = vb2_vmalloc_put_userptr,
437#ifdef CONFIG_HAS_DMA
438 .get_dmabuf = vb2_vmalloc_get_dmabuf,
439#endif
440 .map_dmabuf = vb2_vmalloc_map_dmabuf,
441 .unmap_dmabuf = vb2_vmalloc_unmap_dmabuf,
442 .attach_dmabuf = vb2_vmalloc_attach_dmabuf,
443 .detach_dmabuf = vb2_vmalloc_detach_dmabuf,
444 .vaddr = vb2_vmalloc_vaddr,
445 .mmap = vb2_vmalloc_mmap,
446 .num_users = vb2_vmalloc_num_users,
447};
448EXPORT_SYMBOL_GPL(vb2_vmalloc_memops);
449
450MODULE_DESCRIPTION("vmalloc memory handling routines for videobuf2");
451MODULE_AUTHOR("Pawel Osciak <pawel@osciak.com>");
452MODULE_LICENSE("GPL");
453
