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