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Commit | Line | Data |
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7a7d9a89 | 1 | /* |
0705135e | 2 | * helper functions for SG DMA video4linux capture buffers |
7a7d9a89 MCC |
3 | * |
4 | * The functions expect the hardware being able to scatter gatter | |
5 | * (i.e. the buffers are not linear in physical memory, but fragmented | |
6 | * into PAGE_SIZE chunks). They also assume the driver does not need | |
7 | * to touch the video data. | |
8 | * | |
9 | * (c) 2007 Mauro Carvalho Chehab, <mchehab@infradead.org> | |
10 | * | |
11 | * Highly based on video-buf written originally by: | |
12 | * (c) 2001,02 Gerd Knorr <kraxel@bytesex.org> | |
13 | * (c) 2006 Mauro Carvalho Chehab, <mchehab@infradead.org> | |
14 | * (c) 2006 Ted Walther and John Sokol | |
15 | * | |
16 | * This program is free software; you can redistribute it and/or modify | |
17 | * it under the terms of the GNU General Public License as published by | |
18 | * the Free Software Foundation; either version 2 | |
19 | */ | |
20 | ||
21 | #include <linux/init.h> | |
22 | #include <linux/module.h> | |
23 | #include <linux/moduleparam.h> | |
24 | #include <linux/slab.h> | |
25 | #include <linux/interrupt.h> | |
26 | ||
0705135e | 27 | #include <linux/dma-mapping.h> |
7a7d9a89 MCC |
28 | #include <linux/vmalloc.h> |
29 | #include <linux/pagemap.h> | |
11763609 | 30 | #include <linux/scatterlist.h> |
7a7d9a89 MCC |
31 | #include <asm/page.h> |
32 | #include <asm/pgtable.h> | |
33 | ||
34 | #include <media/videobuf-dma-sg.h> | |
35 | ||
36 | #define MAGIC_DMABUF 0x19721112 | |
37 | #define MAGIC_SG_MEM 0x17890714 | |
38 | ||
39 | #define MAGIC_CHECK(is,should) if (unlikely((is) != (should))) \ | |
40 | { printk(KERN_ERR "magic mismatch: %x (expected %x)\n",is,should); BUG(); } | |
41 | ||
ff699e6b | 42 | static int debug; |
7a7d9a89 MCC |
43 | module_param(debug, int, 0644); |
44 | ||
0705135e | 45 | MODULE_DESCRIPTION("helper module to manage video4linux dma sg buffers"); |
7a7d9a89 MCC |
46 | MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>"); |
47 | MODULE_LICENSE("GPL"); | |
48 | ||
49 | #define dprintk(level, fmt, arg...) if (debug >= level) \ | |
50 | printk(KERN_DEBUG "vbuf-sg: " fmt , ## arg) | |
51 | ||
52 | /* --------------------------------------------------------------------- */ | |
53 | ||
54 | struct scatterlist* | |
55 | videobuf_vmalloc_to_sg(unsigned char *virt, int nr_pages) | |
56 | { | |
57 | struct scatterlist *sglist; | |
58 | struct page *pg; | |
59 | int i; | |
60 | ||
61 | sglist = kcalloc(nr_pages, sizeof(struct scatterlist), GFP_KERNEL); | |
62 | if (NULL == sglist) | |
63 | return NULL; | |
45711f1a | 64 | sg_init_table(sglist, nr_pages); |
7a7d9a89 MCC |
65 | for (i = 0; i < nr_pages; i++, virt += PAGE_SIZE) { |
66 | pg = vmalloc_to_page(virt); | |
67 | if (NULL == pg) | |
68 | goto err; | |
69 | BUG_ON(PageHighMem(pg)); | |
642f1490 | 70 | sg_set_page(&sglist[i], pg, PAGE_SIZE, 0); |
7a7d9a89 MCC |
71 | } |
72 | return sglist; | |
73 | ||
74 | err: | |
75 | kfree(sglist); | |
76 | return NULL; | |
77 | } | |
78 | ||
79 | struct scatterlist* | |
80 | videobuf_pages_to_sg(struct page **pages, int nr_pages, int offset) | |
81 | { | |
82 | struct scatterlist *sglist; | |
83 | int i = 0; | |
84 | ||
85 | if (NULL == pages[0]) | |
86 | return NULL; | |
87 | sglist = kcalloc(nr_pages, sizeof(*sglist), GFP_KERNEL); | |
88 | if (NULL == sglist) | |
89 | return NULL; | |
45711f1a | 90 | sg_init_table(sglist, nr_pages); |
7a7d9a89 MCC |
91 | |
92 | if (NULL == pages[0]) | |
93 | goto nopage; | |
94 | if (PageHighMem(pages[0])) | |
95 | /* DMA to highmem pages might not work */ | |
96 | goto highmem; | |
642f1490 | 97 | sg_set_page(&sglist[0], pages[0], PAGE_SIZE - offset, offset); |
7a7d9a89 MCC |
98 | for (i = 1; i < nr_pages; i++) { |
99 | if (NULL == pages[i]) | |
100 | goto nopage; | |
101 | if (PageHighMem(pages[i])) | |
102 | goto highmem; | |
642f1490 | 103 | sg_set_page(&sglist[i], pages[i], PAGE_SIZE, 0); |
7a7d9a89 MCC |
104 | } |
105 | return sglist; | |
106 | ||
107 | nopage: | |
108 | dprintk(2,"sgl: oops - no page\n"); | |
109 | kfree(sglist); | |
110 | return NULL; | |
111 | ||
112 | highmem: | |
113 | dprintk(2,"sgl: oops - highmem page\n"); | |
114 | kfree(sglist); | |
115 | return NULL; | |
116 | } | |
117 | ||
118 | /* --------------------------------------------------------------------- */ | |
119 | ||
120 | struct videobuf_dmabuf *videobuf_to_dma (struct videobuf_buffer *buf) | |
121 | { | |
0705135e GL |
122 | struct videobuf_dma_sg_memory *mem = buf->priv; |
123 | BUG_ON(!mem); | |
7a7d9a89 | 124 | |
0705135e | 125 | MAGIC_CHECK(mem->magic, MAGIC_SG_MEM); |
7a7d9a89 MCC |
126 | |
127 | return &mem->dma; | |
128 | } | |
129 | ||
130 | void videobuf_dma_init(struct videobuf_dmabuf *dma) | |
131 | { | |
132 | memset(dma,0,sizeof(*dma)); | |
133 | dma->magic = MAGIC_DMABUF; | |
134 | } | |
135 | ||
9900132f ML |
136 | static int videobuf_dma_init_user_locked(struct videobuf_dmabuf *dma, |
137 | int direction, unsigned long data, unsigned long size) | |
7a7d9a89 MCC |
138 | { |
139 | unsigned long first,last; | |
140 | int err, rw = 0; | |
141 | ||
142 | dma->direction = direction; | |
143 | switch (dma->direction) { | |
0705135e GL |
144 | case DMA_FROM_DEVICE: |
145 | rw = READ; | |
146 | break; | |
147 | case DMA_TO_DEVICE: | |
148 | rw = WRITE; | |
149 | break; | |
150 | default: | |
151 | BUG(); | |
7a7d9a89 MCC |
152 | } |
153 | ||
154 | first = (data & PAGE_MASK) >> PAGE_SHIFT; | |
155 | last = ((data+size-1) & PAGE_MASK) >> PAGE_SHIFT; | |
156 | dma->offset = data & ~PAGE_MASK; | |
157 | dma->nr_pages = last-first+1; | |
158 | dma->pages = kmalloc(dma->nr_pages * sizeof(struct page*), | |
159 | GFP_KERNEL); | |
160 | if (NULL == dma->pages) | |
161 | return -ENOMEM; | |
162 | dprintk(1,"init user [0x%lx+0x%lx => %d pages]\n", | |
163 | data,size,dma->nr_pages); | |
164 | ||
165 | dma->varea = (void *) data; | |
166 | ||
9900132f | 167 | |
7a7d9a89 MCC |
168 | err = get_user_pages(current,current->mm, |
169 | data & PAGE_MASK, dma->nr_pages, | |
170 | rw == READ, 1, /* force */ | |
171 | dma->pages, NULL); | |
9900132f | 172 | |
7a7d9a89 MCC |
173 | if (err != dma->nr_pages) { |
174 | dma->nr_pages = (err >= 0) ? err : 0; | |
175 | dprintk(1,"get_user_pages: err=%d [%d]\n",err,dma->nr_pages); | |
176 | return err < 0 ? err : -EINVAL; | |
177 | } | |
178 | return 0; | |
179 | } | |
180 | ||
9900132f ML |
181 | int videobuf_dma_init_user(struct videobuf_dmabuf *dma, int direction, |
182 | unsigned long data, unsigned long size) | |
183 | { | |
184 | int ret; | |
185 | down_read(¤t->mm->mmap_sem); | |
186 | ret = videobuf_dma_init_user_locked(dma, direction, data, size); | |
187 | up_read(¤t->mm->mmap_sem); | |
188 | ||
189 | return ret; | |
190 | } | |
191 | ||
7a7d9a89 MCC |
192 | int videobuf_dma_init_kernel(struct videobuf_dmabuf *dma, int direction, |
193 | int nr_pages) | |
194 | { | |
195 | dprintk(1,"init kernel [%d pages]\n",nr_pages); | |
196 | dma->direction = direction; | |
197 | dma->vmalloc = vmalloc_32(nr_pages << PAGE_SHIFT); | |
198 | if (NULL == dma->vmalloc) { | |
199 | dprintk(1,"vmalloc_32(%d pages) failed\n",nr_pages); | |
200 | return -ENOMEM; | |
201 | } | |
202 | dprintk(1,"vmalloc is at addr 0x%08lx, size=%d\n", | |
203 | (unsigned long)dma->vmalloc, | |
204 | nr_pages << PAGE_SHIFT); | |
205 | memset(dma->vmalloc,0,nr_pages << PAGE_SHIFT); | |
206 | dma->nr_pages = nr_pages; | |
207 | return 0; | |
208 | } | |
209 | ||
210 | int videobuf_dma_init_overlay(struct videobuf_dmabuf *dma, int direction, | |
211 | dma_addr_t addr, int nr_pages) | |
212 | { | |
213 | dprintk(1,"init overlay [%d pages @ bus 0x%lx]\n", | |
214 | nr_pages,(unsigned long)addr); | |
215 | dma->direction = direction; | |
216 | if (0 == addr) | |
217 | return -EINVAL; | |
218 | ||
219 | dma->bus_addr = addr; | |
220 | dma->nr_pages = nr_pages; | |
221 | return 0; | |
222 | } | |
223 | ||
0705135e | 224 | int videobuf_dma_map(struct videobuf_queue* q, struct videobuf_dmabuf *dma) |
7a7d9a89 | 225 | { |
7a7d9a89 MCC |
226 | MAGIC_CHECK(dma->magic,MAGIC_DMABUF); |
227 | BUG_ON(0 == dma->nr_pages); | |
228 | ||
229 | if (dma->pages) { | |
230 | dma->sglist = videobuf_pages_to_sg(dma->pages, dma->nr_pages, | |
231 | dma->offset); | |
232 | } | |
233 | if (dma->vmalloc) { | |
234 | dma->sglist = videobuf_vmalloc_to_sg | |
235 | (dma->vmalloc,dma->nr_pages); | |
236 | } | |
237 | if (dma->bus_addr) { | |
238 | dma->sglist = kmalloc(sizeof(struct scatterlist), GFP_KERNEL); | |
239 | if (NULL != dma->sglist) { | |
240 | dma->sglen = 1; | |
241 | sg_dma_address(&dma->sglist[0]) = dma->bus_addr & PAGE_MASK; | |
242 | dma->sglist[0].offset = dma->bus_addr & ~PAGE_MASK; | |
243 | sg_dma_len(&dma->sglist[0]) = dma->nr_pages * PAGE_SIZE; | |
244 | } | |
245 | } | |
246 | if (NULL == dma->sglist) { | |
247 | dprintk(1,"scatterlist is NULL\n"); | |
248 | return -ENOMEM; | |
249 | } | |
250 | if (!dma->bus_addr) { | |
0705135e | 251 | dma->sglen = dma_map_sg(q->dev, dma->sglist, |
7a7d9a89 | 252 | dma->nr_pages, dma->direction); |
7a7d9a89 MCC |
253 | if (0 == dma->sglen) { |
254 | printk(KERN_WARNING | |
255 | "%s: videobuf_map_sg failed\n",__FUNCTION__); | |
256 | kfree(dma->sglist); | |
257 | dma->sglist = NULL; | |
258 | dma->sglen = 0; | |
259 | return -EIO; | |
260 | } | |
261 | } | |
262 | return 0; | |
263 | } | |
264 | ||
0705135e | 265 | int videobuf_dma_sync(struct videobuf_queue *q, struct videobuf_dmabuf *dma) |
7a7d9a89 | 266 | { |
0705135e | 267 | MAGIC_CHECK(dma->magic, MAGIC_DMABUF); |
7a7d9a89 MCC |
268 | BUG_ON(!dma->sglen); |
269 | ||
0705135e | 270 | dma_sync_sg_for_cpu(q->dev, dma->sglist, dma->nr_pages, dma->direction); |
7a7d9a89 MCC |
271 | return 0; |
272 | } | |
273 | ||
274 | int videobuf_dma_unmap(struct videobuf_queue* q,struct videobuf_dmabuf *dma) | |
275 | { | |
0705135e | 276 | MAGIC_CHECK(dma->magic, MAGIC_DMABUF); |
7a7d9a89 MCC |
277 | if (!dma->sglen) |
278 | return 0; | |
279 | ||
0705135e | 280 | dma_unmap_sg(q->dev, dma->sglist, dma->nr_pages, dma->direction); |
5ddff434 | 281 | |
7a7d9a89 MCC |
282 | kfree(dma->sglist); |
283 | dma->sglist = NULL; | |
284 | dma->sglen = 0; | |
285 | return 0; | |
286 | } | |
287 | ||
288 | int videobuf_dma_free(struct videobuf_dmabuf *dma) | |
289 | { | |
290 | MAGIC_CHECK(dma->magic,MAGIC_DMABUF); | |
291 | BUG_ON(dma->sglen); | |
292 | ||
293 | if (dma->pages) { | |
294 | int i; | |
295 | for (i=0; i < dma->nr_pages; i++) | |
296 | page_cache_release(dma->pages[i]); | |
297 | kfree(dma->pages); | |
298 | dma->pages = NULL; | |
299 | } | |
300 | ||
301 | vfree(dma->vmalloc); | |
302 | dma->vmalloc = NULL; | |
303 | dma->varea = NULL; | |
304 | ||
305 | if (dma->bus_addr) { | |
306 | dma->bus_addr = 0; | |
307 | } | |
0705135e | 308 | dma->direction = DMA_NONE; |
7a7d9a89 MCC |
309 | return 0; |
310 | } | |
311 | ||
312 | /* --------------------------------------------------------------------- */ | |
313 | ||
0705135e | 314 | int videobuf_sg_dma_map(struct device *dev, struct videobuf_dmabuf *dma) |
7a7d9a89 MCC |
315 | { |
316 | struct videobuf_queue q; | |
7a7d9a89 | 317 | |
0705135e | 318 | q.dev = dev; |
7a7d9a89 | 319 | |
0705135e | 320 | return videobuf_dma_map(&q, dma); |
7a7d9a89 MCC |
321 | } |
322 | ||
0705135e | 323 | int videobuf_sg_dma_unmap(struct device *dev, struct videobuf_dmabuf *dma) |
7a7d9a89 MCC |
324 | { |
325 | struct videobuf_queue q; | |
7a7d9a89 | 326 | |
0705135e | 327 | q.dev = dev; |
7a7d9a89 | 328 | |
0705135e | 329 | return videobuf_dma_unmap(&q, dma); |
7a7d9a89 MCC |
330 | } |
331 | ||
332 | /* --------------------------------------------------------------------- */ | |
333 | ||
334 | static void | |
335 | videobuf_vm_open(struct vm_area_struct *vma) | |
336 | { | |
337 | struct videobuf_mapping *map = vma->vm_private_data; | |
338 | ||
339 | dprintk(2,"vm_open %p [count=%d,vma=%08lx-%08lx]\n",map, | |
340 | map->count,vma->vm_start,vma->vm_end); | |
341 | map->count++; | |
342 | } | |
343 | ||
344 | static void | |
345 | videobuf_vm_close(struct vm_area_struct *vma) | |
346 | { | |
347 | struct videobuf_mapping *map = vma->vm_private_data; | |
348 | struct videobuf_queue *q = map->q; | |
0705135e | 349 | struct videobuf_dma_sg_memory *mem; |
7a7d9a89 MCC |
350 | int i; |
351 | ||
352 | dprintk(2,"vm_close %p [count=%d,vma=%08lx-%08lx]\n",map, | |
353 | map->count,vma->vm_start,vma->vm_end); | |
354 | ||
355 | map->count--; | |
356 | if (0 == map->count) { | |
357 | dprintk(1,"munmap %p q=%p\n",map,q); | |
64f9477f | 358 | mutex_lock(&q->vb_lock); |
7a7d9a89 MCC |
359 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { |
360 | if (NULL == q->bufs[i]) | |
361 | continue; | |
362 | mem=q->bufs[i]->priv; | |
363 | ||
364 | if (!mem) | |
365 | continue; | |
366 | ||
367 | MAGIC_CHECK(mem->magic,MAGIC_SG_MEM); | |
368 | ||
851c0c96 | 369 | if (q->bufs[i]->map != map) |
7a7d9a89 | 370 | continue; |
851c0c96 | 371 | q->bufs[i]->map = NULL; |
7a7d9a89 MCC |
372 | q->bufs[i]->baddr = 0; |
373 | q->ops->buf_release(q,q->bufs[i]); | |
374 | } | |
64f9477f | 375 | mutex_unlock(&q->vb_lock); |
7a7d9a89 MCC |
376 | kfree(map); |
377 | } | |
378 | return; | |
379 | } | |
380 | ||
381 | /* | |
382 | * Get a anonymous page for the mapping. Make sure we can DMA to that | |
383 | * memory location with 32bit PCI devices (i.e. don't use highmem for | |
384 | * now ...). Bounce buffers don't work very well for the data rates | |
385 | * video capture has. | |
386 | */ | |
105354a0 NP |
387 | static int |
388 | videobuf_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) | |
7a7d9a89 MCC |
389 | { |
390 | struct page *page; | |
391 | ||
105354a0 NP |
392 | dprintk(3,"fault: fault @ %08lx [vma %08lx-%08lx]\n", |
393 | (unsigned long)vmf->virtual_address,vma->vm_start,vma->vm_end); | |
7a7d9a89 MCC |
394 | page = alloc_page(GFP_USER | __GFP_DMA32); |
395 | if (!page) | |
105354a0 | 396 | return VM_FAULT_OOM; |
d172b8bd AM |
397 | clear_user_page(page_address(page), (unsigned long)vmf->virtual_address, |
398 | page); | |
105354a0 NP |
399 | vmf->page = page; |
400 | return 0; | |
7a7d9a89 MCC |
401 | } |
402 | ||
403 | static struct vm_operations_struct videobuf_vm_ops = | |
404 | { | |
405 | .open = videobuf_vm_open, | |
406 | .close = videobuf_vm_close, | |
105354a0 | 407 | .fault = videobuf_vm_fault, |
7a7d9a89 MCC |
408 | }; |
409 | ||
410 | /* --------------------------------------------------------------------- | |
0705135e | 411 | * SG handlers for the generic methods |
7a7d9a89 MCC |
412 | */ |
413 | ||
414 | /* Allocated area consists on 3 parts: | |
415 | struct video_buffer | |
416 | struct <driver>_buffer (cx88_buffer, saa7134_buf, ...) | |
0705135e | 417 | struct videobuf_dma_sg_memory |
7a7d9a89 MCC |
418 | */ |
419 | ||
420 | static void *__videobuf_alloc(size_t size) | |
421 | { | |
0705135e | 422 | struct videobuf_dma_sg_memory *mem; |
7a7d9a89 MCC |
423 | struct videobuf_buffer *vb; |
424 | ||
425 | vb = kzalloc(size+sizeof(*mem),GFP_KERNEL); | |
426 | ||
427 | mem = vb->priv = ((char *)vb)+size; | |
428 | mem->magic=MAGIC_SG_MEM; | |
429 | ||
430 | videobuf_dma_init(&mem->dma); | |
431 | ||
432 | dprintk(1,"%s: allocated at %p(%ld+%ld) & %p(%ld)\n", | |
433 | __FUNCTION__,vb,(long)sizeof(*vb),(long)size-sizeof(*vb), | |
434 | mem,(long)sizeof(*mem)); | |
435 | ||
436 | return vb; | |
437 | } | |
438 | ||
439 | static int __videobuf_iolock (struct videobuf_queue* q, | |
440 | struct videobuf_buffer *vb, | |
441 | struct v4l2_framebuffer *fbuf) | |
442 | { | |
443 | int err,pages; | |
444 | dma_addr_t bus; | |
0705135e | 445 | struct videobuf_dma_sg_memory *mem = vb->priv; |
7a7d9a89 MCC |
446 | BUG_ON(!mem); |
447 | ||
0705135e | 448 | MAGIC_CHECK(mem->magic, MAGIC_SG_MEM); |
7a7d9a89 MCC |
449 | |
450 | switch (vb->memory) { | |
451 | case V4L2_MEMORY_MMAP: | |
452 | case V4L2_MEMORY_USERPTR: | |
453 | if (0 == vb->baddr) { | |
454 | /* no userspace addr -- kernel bounce buffer */ | |
455 | pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT; | |
456 | err = videobuf_dma_init_kernel( &mem->dma, | |
0705135e | 457 | DMA_FROM_DEVICE, |
7a7d9a89 MCC |
458 | pages ); |
459 | if (0 != err) | |
460 | return err; | |
9900132f | 461 | } else if (vb->memory == V4L2_MEMORY_USERPTR) { |
7a7d9a89 MCC |
462 | /* dma directly to userspace */ |
463 | err = videobuf_dma_init_user( &mem->dma, | |
0705135e | 464 | DMA_FROM_DEVICE, |
7a7d9a89 MCC |
465 | vb->baddr,vb->bsize ); |
466 | if (0 != err) | |
467 | return err; | |
9900132f ML |
468 | } else { |
469 | /* NOTE: HACK: videobuf_iolock on V4L2_MEMORY_MMAP | |
470 | buffers can only be called from videobuf_qbuf | |
471 | we take current->mm->mmap_sem there, to prevent | |
472 | locking inversion, so don't take it here */ | |
473 | ||
474 | err = videobuf_dma_init_user_locked(&mem->dma, | |
0705135e | 475 | DMA_FROM_DEVICE, |
9900132f ML |
476 | vb->baddr, vb->bsize); |
477 | if (0 != err) | |
478 | return err; | |
7a7d9a89 MCC |
479 | } |
480 | break; | |
481 | case V4L2_MEMORY_OVERLAY: | |
482 | if (NULL == fbuf) | |
483 | return -EINVAL; | |
484 | /* FIXME: need sanity checks for vb->boff */ | |
485 | /* | |
486 | * Using a double cast to avoid compiler warnings when | |
487 | * building for PAE. Compiler doesn't like direct casting | |
488 | * of a 32 bit ptr to 64 bit integer. | |
489 | */ | |
490 | bus = (dma_addr_t)(unsigned long)fbuf->base + vb->boff; | |
491 | pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT; | |
0705135e | 492 | err = videobuf_dma_init_overlay(&mem->dma, DMA_FROM_DEVICE, |
7a7d9a89 MCC |
493 | bus, pages); |
494 | if (0 != err) | |
495 | return err; | |
496 | break; | |
497 | default: | |
498 | BUG(); | |
499 | } | |
0705135e | 500 | err = videobuf_dma_map(q, &mem->dma); |
7a7d9a89 MCC |
501 | if (0 != err) |
502 | return err; | |
503 | ||
504 | return 0; | |
505 | } | |
506 | ||
507 | static int __videobuf_sync(struct videobuf_queue *q, | |
508 | struct videobuf_buffer *buf) | |
509 | { | |
0705135e GL |
510 | struct videobuf_dma_sg_memory *mem = buf->priv; |
511 | BUG_ON(!mem); | |
7a7d9a89 MCC |
512 | MAGIC_CHECK(mem->magic,MAGIC_SG_MEM); |
513 | ||
514 | return videobuf_dma_sync(q,&mem->dma); | |
515 | } | |
516 | ||
517 | static int __videobuf_mmap_free(struct videobuf_queue *q) | |
518 | { | |
519 | int i; | |
520 | ||
521 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { | |
522 | if (q->bufs[i]) { | |
851c0c96 | 523 | if (q->bufs[i]->map) |
7a7d9a89 MCC |
524 | return -EBUSY; |
525 | } | |
526 | } | |
527 | ||
528 | return 0; | |
529 | } | |
530 | ||
531 | static int __videobuf_mmap_mapper(struct videobuf_queue *q, | |
532 | struct vm_area_struct *vma) | |
533 | { | |
0705135e | 534 | struct videobuf_dma_sg_memory *mem; |
7a7d9a89 MCC |
535 | struct videobuf_mapping *map; |
536 | unsigned int first,last,size,i; | |
537 | int retval; | |
538 | ||
539 | retval = -EINVAL; | |
540 | if (!(vma->vm_flags & VM_WRITE)) { | |
541 | dprintk(1,"mmap app bug: PROT_WRITE please\n"); | |
542 | goto done; | |
543 | } | |
544 | if (!(vma->vm_flags & VM_SHARED)) { | |
545 | dprintk(1,"mmap app bug: MAP_SHARED please\n"); | |
546 | goto done; | |
547 | } | |
548 | ||
549 | /* look for first buffer to map */ | |
550 | for (first = 0; first < VIDEO_MAX_FRAME; first++) { | |
551 | if (NULL == q->bufs[first]) | |
552 | continue; | |
553 | mem=q->bufs[first]->priv; | |
0705135e | 554 | BUG_ON(!mem); |
7a7d9a89 MCC |
555 | MAGIC_CHECK(mem->magic,MAGIC_SG_MEM); |
556 | ||
557 | if (V4L2_MEMORY_MMAP != q->bufs[first]->memory) | |
558 | continue; | |
559 | if (q->bufs[first]->boff == (vma->vm_pgoff << PAGE_SHIFT)) | |
560 | break; | |
561 | } | |
562 | if (VIDEO_MAX_FRAME == first) { | |
563 | dprintk(1,"mmap app bug: offset invalid [offset=0x%lx]\n", | |
564 | (vma->vm_pgoff << PAGE_SHIFT)); | |
565 | goto done; | |
566 | } | |
567 | ||
568 | /* look for last buffer to map */ | |
569 | for (size = 0, last = first; last < VIDEO_MAX_FRAME; last++) { | |
570 | if (NULL == q->bufs[last]) | |
571 | continue; | |
572 | if (V4L2_MEMORY_MMAP != q->bufs[last]->memory) | |
573 | continue; | |
851c0c96 | 574 | if (q->bufs[last]->map) { |
7a7d9a89 MCC |
575 | retval = -EBUSY; |
576 | goto done; | |
577 | } | |
578 | size += q->bufs[last]->bsize; | |
579 | if (size == (vma->vm_end - vma->vm_start)) | |
580 | break; | |
581 | } | |
582 | if (VIDEO_MAX_FRAME == last) { | |
583 | dprintk(1,"mmap app bug: size invalid [size=0x%lx]\n", | |
584 | (vma->vm_end - vma->vm_start)); | |
585 | goto done; | |
586 | } | |
587 | ||
588 | /* create mapping + update buffer list */ | |
589 | retval = -ENOMEM; | |
590 | map = kmalloc(sizeof(struct videobuf_mapping),GFP_KERNEL); | |
591 | if (NULL == map) | |
592 | goto done; | |
593 | for (size = 0, i = first; i <= last; size += q->bufs[i++]->bsize) { | |
851c0c96 | 594 | q->bufs[i]->map = map; |
7a7d9a89 MCC |
595 | q->bufs[i]->baddr = vma->vm_start + size; |
596 | } | |
597 | map->count = 1; | |
598 | map->start = vma->vm_start; | |
599 | map->end = vma->vm_end; | |
600 | map->q = q; | |
601 | vma->vm_ops = &videobuf_vm_ops; | |
602 | vma->vm_flags |= VM_DONTEXPAND | VM_RESERVED; | |
603 | vma->vm_flags &= ~VM_IO; /* using shared anonymous pages */ | |
604 | vma->vm_private_data = map; | |
605 | dprintk(1,"mmap %p: q=%p %08lx-%08lx pgoff %08lx bufs %d-%d\n", | |
606 | map,q,vma->vm_start,vma->vm_end,vma->vm_pgoff,first,last); | |
607 | retval = 0; | |
608 | ||
609 | done: | |
610 | return retval; | |
611 | } | |
612 | ||
7a7d9a89 MCC |
613 | static int __videobuf_copy_to_user ( struct videobuf_queue *q, |
614 | char __user *data, size_t count, | |
615 | int nonblocking ) | |
616 | { | |
0705135e GL |
617 | struct videobuf_dma_sg_memory *mem = q->read_buf->priv; |
618 | BUG_ON(!mem); | |
7a7d9a89 MCC |
619 | MAGIC_CHECK(mem->magic,MAGIC_SG_MEM); |
620 | ||
621 | /* copy to userspace */ | |
622 | if (count > q->read_buf->size - q->read_off) | |
623 | count = q->read_buf->size - q->read_off; | |
624 | ||
625 | if (copy_to_user(data, mem->dma.vmalloc+q->read_off, count)) | |
626 | return -EFAULT; | |
627 | ||
628 | return count; | |
629 | } | |
630 | ||
631 | static int __videobuf_copy_stream ( struct videobuf_queue *q, | |
632 | char __user *data, size_t count, size_t pos, | |
633 | int vbihack, int nonblocking ) | |
634 | { | |
635 | unsigned int *fc; | |
0705135e GL |
636 | struct videobuf_dma_sg_memory *mem = q->read_buf->priv; |
637 | BUG_ON(!mem); | |
7a7d9a89 MCC |
638 | MAGIC_CHECK(mem->magic,MAGIC_SG_MEM); |
639 | ||
640 | if (vbihack) { | |
641 | /* dirty, undocumented hack -- pass the frame counter | |
642 | * within the last four bytes of each vbi data block. | |
643 | * We need that one to maintain backward compatibility | |
644 | * to all vbi decoding software out there ... */ | |
645 | fc = (unsigned int*)mem->dma.vmalloc; | |
646 | fc += (q->read_buf->size>>2) -1; | |
647 | *fc = q->read_buf->field_count >> 1; | |
648 | dprintk(1,"vbihack: %d\n",*fc); | |
649 | } | |
650 | ||
651 | /* copy stuff using the common method */ | |
652 | count = __videobuf_copy_to_user (q,data,count,nonblocking); | |
653 | ||
654 | if ( (count==-EFAULT) && (0 == pos) ) | |
655 | return -EFAULT; | |
656 | ||
657 | return count; | |
658 | } | |
659 | ||
0705135e | 660 | static struct videobuf_qtype_ops sg_ops = { |
7a7d9a89 MCC |
661 | .magic = MAGIC_QTYPE_OPS, |
662 | ||
663 | .alloc = __videobuf_alloc, | |
664 | .iolock = __videobuf_iolock, | |
665 | .sync = __videobuf_sync, | |
666 | .mmap_free = __videobuf_mmap_free, | |
667 | .mmap_mapper = __videobuf_mmap_mapper, | |
13bcd5d0 | 668 | .video_copy_to_user = __videobuf_copy_to_user, |
7a7d9a89 MCC |
669 | .copy_stream = __videobuf_copy_stream, |
670 | }; | |
671 | ||
0705135e | 672 | void *videobuf_sg_alloc(size_t size) |
7a7d9a89 MCC |
673 | { |
674 | struct videobuf_queue q; | |
675 | ||
676 | /* Required to make generic handler to call __videobuf_alloc */ | |
0705135e | 677 | q.int_ops = &sg_ops; |
7a7d9a89 | 678 | |
0705135e | 679 | q.msize = size; |
7a7d9a89 | 680 | |
0705135e | 681 | return videobuf_alloc(&q); |
7a7d9a89 MCC |
682 | } |
683 | ||
0705135e | 684 | void videobuf_queue_sg_init(struct videobuf_queue* q, |
7a7d9a89 | 685 | struct videobuf_queue_ops *ops, |
0705135e | 686 | struct device *dev, |
7a7d9a89 MCC |
687 | spinlock_t *irqlock, |
688 | enum v4l2_buf_type type, | |
689 | enum v4l2_field field, | |
690 | unsigned int msize, | |
691 | void *priv) | |
692 | { | |
d4cae5a5 | 693 | videobuf_queue_core_init(q, ops, dev, irqlock, type, field, msize, |
0705135e | 694 | priv, &sg_ops); |
7a7d9a89 MCC |
695 | } |
696 | ||
7a7d9a89 MCC |
697 | /* --------------------------------------------------------------------- */ |
698 | ||
699 | EXPORT_SYMBOL_GPL(videobuf_vmalloc_to_sg); | |
700 | ||
701 | EXPORT_SYMBOL_GPL(videobuf_to_dma); | |
702 | EXPORT_SYMBOL_GPL(videobuf_dma_init); | |
703 | EXPORT_SYMBOL_GPL(videobuf_dma_init_user); | |
704 | EXPORT_SYMBOL_GPL(videobuf_dma_init_kernel); | |
705 | EXPORT_SYMBOL_GPL(videobuf_dma_init_overlay); | |
706 | EXPORT_SYMBOL_GPL(videobuf_dma_map); | |
707 | EXPORT_SYMBOL_GPL(videobuf_dma_sync); | |
708 | EXPORT_SYMBOL_GPL(videobuf_dma_unmap); | |
709 | EXPORT_SYMBOL_GPL(videobuf_dma_free); | |
710 | ||
0705135e GL |
711 | EXPORT_SYMBOL_GPL(videobuf_sg_dma_map); |
712 | EXPORT_SYMBOL_GPL(videobuf_sg_dma_unmap); | |
713 | EXPORT_SYMBOL_GPL(videobuf_sg_alloc); | |
7a7d9a89 | 714 | |
0705135e | 715 | EXPORT_SYMBOL_GPL(videobuf_queue_sg_init); |
7a7d9a89 MCC |
716 | |
717 | /* | |
718 | * Local variables: | |
719 | * c-basic-offset: 8 | |
720 | * End: | |
721 | */ |