Commit | Line | Data |
---|---|---|
7a7d9a89 | 1 | /* |
0705135e | 2 | * helper functions for SG DMA video4linux capture buffers |
7a7d9a89 | 3 | * |
5d6aaf50 | 4 | * The functions expect the hardware being able to scatter gather |
7a7d9a89 MCC |
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 | ||
1010ed13 | 61 | sglist = vmalloc(nr_pages * sizeof(*sglist)); |
7a7d9a89 MCC |
62 | if (NULL == sglist) |
63 | return NULL; | |
1010ed13 | 64 | memset(sglist, 0, nr_pages * sizeof(*sglist)); |
45711f1a | 65 | sg_init_table(sglist, nr_pages); |
7a7d9a89 MCC |
66 | for (i = 0; i < nr_pages; i++, virt += PAGE_SIZE) { |
67 | pg = vmalloc_to_page(virt); | |
68 | if (NULL == pg) | |
69 | goto err; | |
70 | BUG_ON(PageHighMem(pg)); | |
642f1490 | 71 | sg_set_page(&sglist[i], pg, PAGE_SIZE, 0); |
7a7d9a89 MCC |
72 | } |
73 | return sglist; | |
74 | ||
75 | err: | |
1010ed13 | 76 | vfree(sglist); |
7a7d9a89 MCC |
77 | return NULL; |
78 | } | |
79 | ||
80 | struct scatterlist* | |
81 | videobuf_pages_to_sg(struct page **pages, int nr_pages, int offset) | |
82 | { | |
83 | struct scatterlist *sglist; | |
a47cacbd | 84 | int i; |
7a7d9a89 MCC |
85 | |
86 | if (NULL == pages[0]) | |
87 | return NULL; | |
1010ed13 | 88 | sglist = vmalloc(nr_pages * sizeof(*sglist)); |
7a7d9a89 MCC |
89 | if (NULL == sglist) |
90 | return NULL; | |
45711f1a | 91 | sg_init_table(sglist, nr_pages); |
7a7d9a89 | 92 | |
7a7d9a89 MCC |
93 | if (PageHighMem(pages[0])) |
94 | /* DMA to highmem pages might not work */ | |
95 | goto highmem; | |
642f1490 | 96 | sg_set_page(&sglist[0], pages[0], PAGE_SIZE - offset, offset); |
7a7d9a89 MCC |
97 | for (i = 1; i < nr_pages; i++) { |
98 | if (NULL == pages[i]) | |
99 | goto nopage; | |
100 | if (PageHighMem(pages[i])) | |
101 | goto highmem; | |
642f1490 | 102 | sg_set_page(&sglist[i], pages[i], PAGE_SIZE, 0); |
7a7d9a89 MCC |
103 | } |
104 | return sglist; | |
105 | ||
106 | nopage: | |
107 | dprintk(2,"sgl: oops - no page\n"); | |
1010ed13 | 108 | vfree(sglist); |
7a7d9a89 MCC |
109 | return NULL; |
110 | ||
111 | highmem: | |
112 | dprintk(2,"sgl: oops - highmem page\n"); | |
1010ed13 | 113 | vfree(sglist); |
7a7d9a89 MCC |
114 | return NULL; |
115 | } | |
116 | ||
117 | /* --------------------------------------------------------------------- */ | |
118 | ||
119 | struct videobuf_dmabuf *videobuf_to_dma (struct videobuf_buffer *buf) | |
120 | { | |
0705135e GL |
121 | struct videobuf_dma_sg_memory *mem = buf->priv; |
122 | BUG_ON(!mem); | |
7a7d9a89 | 123 | |
0705135e | 124 | MAGIC_CHECK(mem->magic, MAGIC_SG_MEM); |
7a7d9a89 MCC |
125 | |
126 | return &mem->dma; | |
127 | } | |
128 | ||
129 | void videobuf_dma_init(struct videobuf_dmabuf *dma) | |
130 | { | |
131 | memset(dma,0,sizeof(*dma)); | |
132 | dma->magic = MAGIC_DMABUF; | |
133 | } | |
134 | ||
9900132f ML |
135 | static int videobuf_dma_init_user_locked(struct videobuf_dmabuf *dma, |
136 | int direction, unsigned long data, unsigned long size) | |
7a7d9a89 MCC |
137 | { |
138 | unsigned long first,last; | |
139 | int err, rw = 0; | |
140 | ||
141 | dma->direction = direction; | |
142 | switch (dma->direction) { | |
0705135e GL |
143 | case DMA_FROM_DEVICE: |
144 | rw = READ; | |
145 | break; | |
146 | case DMA_TO_DEVICE: | |
147 | rw = WRITE; | |
148 | break; | |
149 | default: | |
150 | BUG(); | |
7a7d9a89 MCC |
151 | } |
152 | ||
153 | first = (data & PAGE_MASK) >> PAGE_SHIFT; | |
154 | last = ((data+size-1) & PAGE_MASK) >> PAGE_SHIFT; | |
155 | dma->offset = data & ~PAGE_MASK; | |
156 | dma->nr_pages = last-first+1; | |
157 | dma->pages = kmalloc(dma->nr_pages * sizeof(struct page*), | |
158 | GFP_KERNEL); | |
159 | if (NULL == dma->pages) | |
160 | return -ENOMEM; | |
161 | dprintk(1,"init user [0x%lx+0x%lx => %d pages]\n", | |
162 | data,size,dma->nr_pages); | |
163 | ||
7a7d9a89 MCC |
164 | err = get_user_pages(current,current->mm, |
165 | data & PAGE_MASK, dma->nr_pages, | |
166 | rw == READ, 1, /* force */ | |
167 | dma->pages, NULL); | |
9900132f | 168 | |
7a7d9a89 MCC |
169 | if (err != dma->nr_pages) { |
170 | dma->nr_pages = (err >= 0) ? err : 0; | |
171 | dprintk(1,"get_user_pages: err=%d [%d]\n",err,dma->nr_pages); | |
172 | return err < 0 ? err : -EINVAL; | |
173 | } | |
174 | return 0; | |
175 | } | |
176 | ||
9900132f ML |
177 | int videobuf_dma_init_user(struct videobuf_dmabuf *dma, int direction, |
178 | unsigned long data, unsigned long size) | |
179 | { | |
180 | int ret; | |
181 | down_read(¤t->mm->mmap_sem); | |
182 | ret = videobuf_dma_init_user_locked(dma, direction, data, size); | |
183 | up_read(¤t->mm->mmap_sem); | |
184 | ||
185 | return ret; | |
186 | } | |
187 | ||
7a7d9a89 MCC |
188 | int videobuf_dma_init_kernel(struct videobuf_dmabuf *dma, int direction, |
189 | int nr_pages) | |
190 | { | |
191 | dprintk(1,"init kernel [%d pages]\n",nr_pages); | |
192 | dma->direction = direction; | |
193 | dma->vmalloc = vmalloc_32(nr_pages << PAGE_SHIFT); | |
194 | if (NULL == dma->vmalloc) { | |
195 | dprintk(1,"vmalloc_32(%d pages) failed\n",nr_pages); | |
196 | return -ENOMEM; | |
197 | } | |
198 | dprintk(1,"vmalloc is at addr 0x%08lx, size=%d\n", | |
199 | (unsigned long)dma->vmalloc, | |
200 | nr_pages << PAGE_SHIFT); | |
201 | memset(dma->vmalloc,0,nr_pages << PAGE_SHIFT); | |
202 | dma->nr_pages = nr_pages; | |
203 | return 0; | |
204 | } | |
205 | ||
206 | int videobuf_dma_init_overlay(struct videobuf_dmabuf *dma, int direction, | |
207 | dma_addr_t addr, int nr_pages) | |
208 | { | |
209 | dprintk(1,"init overlay [%d pages @ bus 0x%lx]\n", | |
210 | nr_pages,(unsigned long)addr); | |
211 | dma->direction = direction; | |
212 | if (0 == addr) | |
213 | return -EINVAL; | |
214 | ||
215 | dma->bus_addr = addr; | |
216 | dma->nr_pages = nr_pages; | |
217 | return 0; | |
218 | } | |
219 | ||
0705135e | 220 | int videobuf_dma_map(struct videobuf_queue* q, struct videobuf_dmabuf *dma) |
7a7d9a89 | 221 | { |
7a7d9a89 MCC |
222 | MAGIC_CHECK(dma->magic,MAGIC_DMABUF); |
223 | BUG_ON(0 == dma->nr_pages); | |
224 | ||
225 | if (dma->pages) { | |
226 | dma->sglist = videobuf_pages_to_sg(dma->pages, dma->nr_pages, | |
227 | dma->offset); | |
228 | } | |
229 | if (dma->vmalloc) { | |
230 | dma->sglist = videobuf_vmalloc_to_sg | |
231 | (dma->vmalloc,dma->nr_pages); | |
232 | } | |
233 | if (dma->bus_addr) { | |
1010ed13 | 234 | dma->sglist = vmalloc(sizeof(*dma->sglist)); |
7a7d9a89 MCC |
235 | if (NULL != dma->sglist) { |
236 | dma->sglen = 1; | |
237 | sg_dma_address(&dma->sglist[0]) = dma->bus_addr & PAGE_MASK; | |
238 | dma->sglist[0].offset = dma->bus_addr & ~PAGE_MASK; | |
239 | sg_dma_len(&dma->sglist[0]) = dma->nr_pages * PAGE_SIZE; | |
240 | } | |
241 | } | |
242 | if (NULL == dma->sglist) { | |
243 | dprintk(1,"scatterlist is NULL\n"); | |
244 | return -ENOMEM; | |
245 | } | |
246 | if (!dma->bus_addr) { | |
0705135e | 247 | dma->sglen = dma_map_sg(q->dev, dma->sglist, |
7a7d9a89 | 248 | dma->nr_pages, dma->direction); |
7a7d9a89 MCC |
249 | if (0 == dma->sglen) { |
250 | printk(KERN_WARNING | |
7e28adb2 | 251 | "%s: videobuf_map_sg failed\n",__func__); |
1010ed13 | 252 | vfree(dma->sglist); |
7a7d9a89 MCC |
253 | dma->sglist = NULL; |
254 | dma->sglen = 0; | |
92051b28 | 255 | return -ENOMEM; |
7a7d9a89 MCC |
256 | } |
257 | } | |
258 | return 0; | |
259 | } | |
260 | ||
0705135e | 261 | int videobuf_dma_sync(struct videobuf_queue *q, struct videobuf_dmabuf *dma) |
7a7d9a89 | 262 | { |
0705135e | 263 | MAGIC_CHECK(dma->magic, MAGIC_DMABUF); |
7a7d9a89 MCC |
264 | BUG_ON(!dma->sglen); |
265 | ||
0705135e | 266 | dma_sync_sg_for_cpu(q->dev, dma->sglist, dma->nr_pages, dma->direction); |
7a7d9a89 MCC |
267 | return 0; |
268 | } | |
269 | ||
270 | int videobuf_dma_unmap(struct videobuf_queue* q,struct videobuf_dmabuf *dma) | |
271 | { | |
0705135e | 272 | MAGIC_CHECK(dma->magic, MAGIC_DMABUF); |
7a7d9a89 MCC |
273 | if (!dma->sglen) |
274 | return 0; | |
275 | ||
0705135e | 276 | dma_unmap_sg(q->dev, dma->sglist, dma->nr_pages, dma->direction); |
5ddff434 | 277 | |
1010ed13 | 278 | vfree(dma->sglist); |
7a7d9a89 MCC |
279 | dma->sglist = NULL; |
280 | dma->sglen = 0; | |
281 | return 0; | |
282 | } | |
283 | ||
284 | int videobuf_dma_free(struct videobuf_dmabuf *dma) | |
285 | { | |
286 | MAGIC_CHECK(dma->magic,MAGIC_DMABUF); | |
287 | BUG_ON(dma->sglen); | |
288 | ||
289 | if (dma->pages) { | |
290 | int i; | |
291 | for (i=0; i < dma->nr_pages; i++) | |
292 | page_cache_release(dma->pages[i]); | |
293 | kfree(dma->pages); | |
294 | dma->pages = NULL; | |
295 | } | |
296 | ||
297 | vfree(dma->vmalloc); | |
298 | dma->vmalloc = NULL; | |
7a7d9a89 MCC |
299 | |
300 | if (dma->bus_addr) { | |
301 | dma->bus_addr = 0; | |
302 | } | |
0705135e | 303 | dma->direction = DMA_NONE; |
7a7d9a89 MCC |
304 | return 0; |
305 | } | |
306 | ||
307 | /* --------------------------------------------------------------------- */ | |
308 | ||
0705135e | 309 | int videobuf_sg_dma_map(struct device *dev, struct videobuf_dmabuf *dma) |
7a7d9a89 MCC |
310 | { |
311 | struct videobuf_queue q; | |
7a7d9a89 | 312 | |
0705135e | 313 | q.dev = dev; |
7a7d9a89 | 314 | |
0705135e | 315 | return videobuf_dma_map(&q, dma); |
7a7d9a89 MCC |
316 | } |
317 | ||
0705135e | 318 | int videobuf_sg_dma_unmap(struct device *dev, struct videobuf_dmabuf *dma) |
7a7d9a89 MCC |
319 | { |
320 | struct videobuf_queue q; | |
7a7d9a89 | 321 | |
0705135e | 322 | q.dev = dev; |
7a7d9a89 | 323 | |
0705135e | 324 | return videobuf_dma_unmap(&q, dma); |
7a7d9a89 MCC |
325 | } |
326 | ||
327 | /* --------------------------------------------------------------------- */ | |
328 | ||
329 | static void | |
330 | videobuf_vm_open(struct vm_area_struct *vma) | |
331 | { | |
332 | struct videobuf_mapping *map = vma->vm_private_data; | |
333 | ||
334 | dprintk(2,"vm_open %p [count=%d,vma=%08lx-%08lx]\n",map, | |
335 | map->count,vma->vm_start,vma->vm_end); | |
336 | map->count++; | |
337 | } | |
338 | ||
339 | static void | |
340 | videobuf_vm_close(struct vm_area_struct *vma) | |
341 | { | |
342 | struct videobuf_mapping *map = vma->vm_private_data; | |
343 | struct videobuf_queue *q = map->q; | |
0705135e | 344 | struct videobuf_dma_sg_memory *mem; |
7a7d9a89 MCC |
345 | int i; |
346 | ||
347 | dprintk(2,"vm_close %p [count=%d,vma=%08lx-%08lx]\n",map, | |
348 | map->count,vma->vm_start,vma->vm_end); | |
349 | ||
350 | map->count--; | |
351 | if (0 == map->count) { | |
352 | dprintk(1,"munmap %p q=%p\n",map,q); | |
64f9477f | 353 | mutex_lock(&q->vb_lock); |
7a7d9a89 MCC |
354 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { |
355 | if (NULL == q->bufs[i]) | |
356 | continue; | |
357 | mem=q->bufs[i]->priv; | |
358 | ||
359 | if (!mem) | |
360 | continue; | |
361 | ||
362 | MAGIC_CHECK(mem->magic,MAGIC_SG_MEM); | |
363 | ||
851c0c96 | 364 | if (q->bufs[i]->map != map) |
7a7d9a89 | 365 | continue; |
851c0c96 | 366 | q->bufs[i]->map = NULL; |
7a7d9a89 MCC |
367 | q->bufs[i]->baddr = 0; |
368 | q->ops->buf_release(q,q->bufs[i]); | |
369 | } | |
64f9477f | 370 | mutex_unlock(&q->vb_lock); |
7a7d9a89 MCC |
371 | kfree(map); |
372 | } | |
373 | return; | |
374 | } | |
375 | ||
376 | /* | |
377 | * Get a anonymous page for the mapping. Make sure we can DMA to that | |
378 | * memory location with 32bit PCI devices (i.e. don't use highmem for | |
379 | * now ...). Bounce buffers don't work very well for the data rates | |
380 | * video capture has. | |
381 | */ | |
105354a0 NP |
382 | static int |
383 | videobuf_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) | |
7a7d9a89 MCC |
384 | { |
385 | struct page *page; | |
386 | ||
105354a0 NP |
387 | dprintk(3,"fault: fault @ %08lx [vma %08lx-%08lx]\n", |
388 | (unsigned long)vmf->virtual_address,vma->vm_start,vma->vm_end); | |
7a7d9a89 MCC |
389 | page = alloc_page(GFP_USER | __GFP_DMA32); |
390 | if (!page) | |
105354a0 | 391 | return VM_FAULT_OOM; |
c0cd5010 | 392 | clear_user_highpage(page, (unsigned long)vmf->virtual_address); |
105354a0 NP |
393 | vmf->page = page; |
394 | return 0; | |
7a7d9a89 MCC |
395 | } |
396 | ||
397 | static struct vm_operations_struct videobuf_vm_ops = | |
398 | { | |
399 | .open = videobuf_vm_open, | |
400 | .close = videobuf_vm_close, | |
105354a0 | 401 | .fault = videobuf_vm_fault, |
7a7d9a89 MCC |
402 | }; |
403 | ||
404 | /* --------------------------------------------------------------------- | |
0705135e | 405 | * SG handlers for the generic methods |
7a7d9a89 MCC |
406 | */ |
407 | ||
408 | /* Allocated area consists on 3 parts: | |
409 | struct video_buffer | |
410 | struct <driver>_buffer (cx88_buffer, saa7134_buf, ...) | |
0705135e | 411 | struct videobuf_dma_sg_memory |
7a7d9a89 MCC |
412 | */ |
413 | ||
414 | static void *__videobuf_alloc(size_t size) | |
415 | { | |
0705135e | 416 | struct videobuf_dma_sg_memory *mem; |
7a7d9a89 MCC |
417 | struct videobuf_buffer *vb; |
418 | ||
419 | vb = kzalloc(size+sizeof(*mem),GFP_KERNEL); | |
420 | ||
421 | mem = vb->priv = ((char *)vb)+size; | |
422 | mem->magic=MAGIC_SG_MEM; | |
423 | ||
424 | videobuf_dma_init(&mem->dma); | |
425 | ||
426 | dprintk(1,"%s: allocated at %p(%ld+%ld) & %p(%ld)\n", | |
7e28adb2 | 427 | __func__,vb,(long)sizeof(*vb),(long)size-sizeof(*vb), |
7a7d9a89 MCC |
428 | mem,(long)sizeof(*mem)); |
429 | ||
430 | return vb; | |
431 | } | |
432 | ||
59d34489 MCC |
433 | static void *__videobuf_to_vmalloc (struct videobuf_buffer *buf) |
434 | { | |
435 | struct videobuf_dma_sg_memory *mem = buf->priv; | |
436 | BUG_ON(!mem); | |
437 | ||
438 | MAGIC_CHECK(mem->magic, MAGIC_SG_MEM); | |
439 | ||
440 | return mem->dma.vmalloc; | |
441 | } | |
442 | ||
7a7d9a89 MCC |
443 | static int __videobuf_iolock (struct videobuf_queue* q, |
444 | struct videobuf_buffer *vb, | |
445 | struct v4l2_framebuffer *fbuf) | |
446 | { | |
447 | int err,pages; | |
448 | dma_addr_t bus; | |
0705135e | 449 | struct videobuf_dma_sg_memory *mem = vb->priv; |
7a7d9a89 MCC |
450 | BUG_ON(!mem); |
451 | ||
0705135e | 452 | MAGIC_CHECK(mem->magic, MAGIC_SG_MEM); |
7a7d9a89 MCC |
453 | |
454 | switch (vb->memory) { | |
455 | case V4L2_MEMORY_MMAP: | |
456 | case V4L2_MEMORY_USERPTR: | |
457 | if (0 == vb->baddr) { | |
458 | /* no userspace addr -- kernel bounce buffer */ | |
459 | pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT; | |
460 | err = videobuf_dma_init_kernel( &mem->dma, | |
0705135e | 461 | DMA_FROM_DEVICE, |
7a7d9a89 MCC |
462 | pages ); |
463 | if (0 != err) | |
464 | return err; | |
9900132f | 465 | } else if (vb->memory == V4L2_MEMORY_USERPTR) { |
7a7d9a89 MCC |
466 | /* dma directly to userspace */ |
467 | err = videobuf_dma_init_user( &mem->dma, | |
0705135e | 468 | DMA_FROM_DEVICE, |
7a7d9a89 MCC |
469 | vb->baddr,vb->bsize ); |
470 | if (0 != err) | |
471 | return err; | |
9900132f ML |
472 | } else { |
473 | /* NOTE: HACK: videobuf_iolock on V4L2_MEMORY_MMAP | |
474 | buffers can only be called from videobuf_qbuf | |
475 | we take current->mm->mmap_sem there, to prevent | |
476 | locking inversion, so don't take it here */ | |
477 | ||
478 | err = videobuf_dma_init_user_locked(&mem->dma, | |
0705135e | 479 | DMA_FROM_DEVICE, |
9900132f ML |
480 | vb->baddr, vb->bsize); |
481 | if (0 != err) | |
482 | return err; | |
7a7d9a89 MCC |
483 | } |
484 | break; | |
485 | case V4L2_MEMORY_OVERLAY: | |
486 | if (NULL == fbuf) | |
487 | return -EINVAL; | |
488 | /* FIXME: need sanity checks for vb->boff */ | |
489 | /* | |
490 | * Using a double cast to avoid compiler warnings when | |
491 | * building for PAE. Compiler doesn't like direct casting | |
492 | * of a 32 bit ptr to 64 bit integer. | |
493 | */ | |
494 | bus = (dma_addr_t)(unsigned long)fbuf->base + vb->boff; | |
495 | pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT; | |
0705135e | 496 | err = videobuf_dma_init_overlay(&mem->dma, DMA_FROM_DEVICE, |
7a7d9a89 MCC |
497 | bus, pages); |
498 | if (0 != err) | |
499 | return err; | |
500 | break; | |
501 | default: | |
502 | BUG(); | |
503 | } | |
0705135e | 504 | err = videobuf_dma_map(q, &mem->dma); |
7a7d9a89 MCC |
505 | if (0 != err) |
506 | return err; | |
507 | ||
508 | return 0; | |
509 | } | |
510 | ||
511 | static int __videobuf_sync(struct videobuf_queue *q, | |
512 | struct videobuf_buffer *buf) | |
513 | { | |
0705135e GL |
514 | struct videobuf_dma_sg_memory *mem = buf->priv; |
515 | BUG_ON(!mem); | |
7a7d9a89 MCC |
516 | MAGIC_CHECK(mem->magic,MAGIC_SG_MEM); |
517 | ||
518 | return videobuf_dma_sync(q,&mem->dma); | |
519 | } | |
520 | ||
521 | static int __videobuf_mmap_free(struct videobuf_queue *q) | |
522 | { | |
523 | int i; | |
524 | ||
525 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { | |
526 | if (q->bufs[i]) { | |
851c0c96 | 527 | if (q->bufs[i]->map) |
7a7d9a89 MCC |
528 | return -EBUSY; |
529 | } | |
530 | } | |
531 | ||
532 | return 0; | |
533 | } | |
534 | ||
535 | static int __videobuf_mmap_mapper(struct videobuf_queue *q, | |
536 | struct vm_area_struct *vma) | |
537 | { | |
0705135e | 538 | struct videobuf_dma_sg_memory *mem; |
7a7d9a89 MCC |
539 | struct videobuf_mapping *map; |
540 | unsigned int first,last,size,i; | |
541 | int retval; | |
542 | ||
543 | retval = -EINVAL; | |
544 | if (!(vma->vm_flags & VM_WRITE)) { | |
545 | dprintk(1,"mmap app bug: PROT_WRITE please\n"); | |
546 | goto done; | |
547 | } | |
548 | if (!(vma->vm_flags & VM_SHARED)) { | |
549 | dprintk(1,"mmap app bug: MAP_SHARED please\n"); | |
550 | goto done; | |
551 | } | |
552 | ||
ce54093c BP |
553 | /* This function maintains backwards compatibility with V4L1 and will |
554 | * map more than one buffer if the vma length is equal to the combined | |
555 | * size of multiple buffers than it will map them together. See | |
556 | * VIDIOCGMBUF in the v4l spec | |
557 | * | |
558 | * TODO: Allow drivers to specify if they support this mode | |
559 | */ | |
560 | ||
7a7d9a89 MCC |
561 | /* look for first buffer to map */ |
562 | for (first = 0; first < VIDEO_MAX_FRAME; first++) { | |
563 | if (NULL == q->bufs[first]) | |
564 | continue; | |
565 | mem=q->bufs[first]->priv; | |
0705135e | 566 | BUG_ON(!mem); |
7a7d9a89 MCC |
567 | MAGIC_CHECK(mem->magic,MAGIC_SG_MEM); |
568 | ||
569 | if (V4L2_MEMORY_MMAP != q->bufs[first]->memory) | |
570 | continue; | |
571 | if (q->bufs[first]->boff == (vma->vm_pgoff << PAGE_SHIFT)) | |
572 | break; | |
573 | } | |
574 | if (VIDEO_MAX_FRAME == first) { | |
575 | dprintk(1,"mmap app bug: offset invalid [offset=0x%lx]\n", | |
576 | (vma->vm_pgoff << PAGE_SHIFT)); | |
577 | goto done; | |
578 | } | |
579 | ||
580 | /* look for last buffer to map */ | |
581 | for (size = 0, last = first; last < VIDEO_MAX_FRAME; last++) { | |
582 | if (NULL == q->bufs[last]) | |
583 | continue; | |
584 | if (V4L2_MEMORY_MMAP != q->bufs[last]->memory) | |
585 | continue; | |
851c0c96 | 586 | if (q->bufs[last]->map) { |
7a7d9a89 MCC |
587 | retval = -EBUSY; |
588 | goto done; | |
589 | } | |
590 | size += q->bufs[last]->bsize; | |
591 | if (size == (vma->vm_end - vma->vm_start)) | |
592 | break; | |
593 | } | |
594 | if (VIDEO_MAX_FRAME == last) { | |
595 | dprintk(1,"mmap app bug: size invalid [size=0x%lx]\n", | |
596 | (vma->vm_end - vma->vm_start)); | |
597 | goto done; | |
598 | } | |
599 | ||
600 | /* create mapping + update buffer list */ | |
601 | retval = -ENOMEM; | |
602 | map = kmalloc(sizeof(struct videobuf_mapping),GFP_KERNEL); | |
603 | if (NULL == map) | |
604 | goto done; | |
ce54093c BP |
605 | |
606 | size = 0; | |
607 | for (i = first; i <= last; i++) { | |
608 | if (NULL == q->bufs[i]) | |
609 | continue; | |
851c0c96 | 610 | q->bufs[i]->map = map; |
7a7d9a89 | 611 | q->bufs[i]->baddr = vma->vm_start + size; |
ce54093c | 612 | size += q->bufs[i]->bsize; |
7a7d9a89 | 613 | } |
ce54093c | 614 | |
7a7d9a89 MCC |
615 | map->count = 1; |
616 | map->start = vma->vm_start; | |
617 | map->end = vma->vm_end; | |
618 | map->q = q; | |
619 | vma->vm_ops = &videobuf_vm_ops; | |
620 | vma->vm_flags |= VM_DONTEXPAND | VM_RESERVED; | |
621 | vma->vm_flags &= ~VM_IO; /* using shared anonymous pages */ | |
622 | vma->vm_private_data = map; | |
623 | dprintk(1,"mmap %p: q=%p %08lx-%08lx pgoff %08lx bufs %d-%d\n", | |
624 | map,q,vma->vm_start,vma->vm_end,vma->vm_pgoff,first,last); | |
625 | retval = 0; | |
626 | ||
627 | done: | |
628 | return retval; | |
629 | } | |
630 | ||
7a7d9a89 MCC |
631 | static int __videobuf_copy_to_user ( struct videobuf_queue *q, |
632 | char __user *data, size_t count, | |
633 | int nonblocking ) | |
634 | { | |
0705135e GL |
635 | struct videobuf_dma_sg_memory *mem = q->read_buf->priv; |
636 | BUG_ON(!mem); | |
7a7d9a89 MCC |
637 | MAGIC_CHECK(mem->magic,MAGIC_SG_MEM); |
638 | ||
639 | /* copy to userspace */ | |
640 | if (count > q->read_buf->size - q->read_off) | |
641 | count = q->read_buf->size - q->read_off; | |
642 | ||
643 | if (copy_to_user(data, mem->dma.vmalloc+q->read_off, count)) | |
644 | return -EFAULT; | |
645 | ||
646 | return count; | |
647 | } | |
648 | ||
649 | static int __videobuf_copy_stream ( struct videobuf_queue *q, | |
650 | char __user *data, size_t count, size_t pos, | |
651 | int vbihack, int nonblocking ) | |
652 | { | |
653 | unsigned int *fc; | |
0705135e GL |
654 | struct videobuf_dma_sg_memory *mem = q->read_buf->priv; |
655 | BUG_ON(!mem); | |
7a7d9a89 MCC |
656 | MAGIC_CHECK(mem->magic,MAGIC_SG_MEM); |
657 | ||
658 | if (vbihack) { | |
659 | /* dirty, undocumented hack -- pass the frame counter | |
660 | * within the last four bytes of each vbi data block. | |
661 | * We need that one to maintain backward compatibility | |
662 | * to all vbi decoding software out there ... */ | |
663 | fc = (unsigned int*)mem->dma.vmalloc; | |
664 | fc += (q->read_buf->size>>2) -1; | |
665 | *fc = q->read_buf->field_count >> 1; | |
666 | dprintk(1,"vbihack: %d\n",*fc); | |
667 | } | |
668 | ||
669 | /* copy stuff using the common method */ | |
670 | count = __videobuf_copy_to_user (q,data,count,nonblocking); | |
671 | ||
672 | if ( (count==-EFAULT) && (0 == pos) ) | |
673 | return -EFAULT; | |
674 | ||
675 | return count; | |
676 | } | |
677 | ||
0705135e | 678 | static struct videobuf_qtype_ops sg_ops = { |
7a7d9a89 MCC |
679 | .magic = MAGIC_QTYPE_OPS, |
680 | ||
681 | .alloc = __videobuf_alloc, | |
682 | .iolock = __videobuf_iolock, | |
683 | .sync = __videobuf_sync, | |
684 | .mmap_free = __videobuf_mmap_free, | |
685 | .mmap_mapper = __videobuf_mmap_mapper, | |
13bcd5d0 | 686 | .video_copy_to_user = __videobuf_copy_to_user, |
7a7d9a89 | 687 | .copy_stream = __videobuf_copy_stream, |
59d34489 | 688 | .vmalloc = __videobuf_to_vmalloc, |
7a7d9a89 MCC |
689 | }; |
690 | ||
0705135e | 691 | void *videobuf_sg_alloc(size_t size) |
7a7d9a89 MCC |
692 | { |
693 | struct videobuf_queue q; | |
694 | ||
695 | /* Required to make generic handler to call __videobuf_alloc */ | |
0705135e | 696 | q.int_ops = &sg_ops; |
7a7d9a89 | 697 | |
0705135e | 698 | q.msize = size; |
7a7d9a89 | 699 | |
0705135e | 700 | return videobuf_alloc(&q); |
7a7d9a89 MCC |
701 | } |
702 | ||
0705135e | 703 | void videobuf_queue_sg_init(struct videobuf_queue* q, |
7a7d9a89 | 704 | struct videobuf_queue_ops *ops, |
0705135e | 705 | struct device *dev, |
7a7d9a89 MCC |
706 | spinlock_t *irqlock, |
707 | enum v4l2_buf_type type, | |
708 | enum v4l2_field field, | |
709 | unsigned int msize, | |
710 | void *priv) | |
711 | { | |
d4cae5a5 | 712 | videobuf_queue_core_init(q, ops, dev, irqlock, type, field, msize, |
0705135e | 713 | priv, &sg_ops); |
7a7d9a89 MCC |
714 | } |
715 | ||
7a7d9a89 MCC |
716 | /* --------------------------------------------------------------------- */ |
717 | ||
718 | EXPORT_SYMBOL_GPL(videobuf_vmalloc_to_sg); | |
719 | ||
720 | EXPORT_SYMBOL_GPL(videobuf_to_dma); | |
721 | EXPORT_SYMBOL_GPL(videobuf_dma_init); | |
722 | EXPORT_SYMBOL_GPL(videobuf_dma_init_user); | |
723 | EXPORT_SYMBOL_GPL(videobuf_dma_init_kernel); | |
724 | EXPORT_SYMBOL_GPL(videobuf_dma_init_overlay); | |
725 | EXPORT_SYMBOL_GPL(videobuf_dma_map); | |
726 | EXPORT_SYMBOL_GPL(videobuf_dma_sync); | |
727 | EXPORT_SYMBOL_GPL(videobuf_dma_unmap); | |
728 | EXPORT_SYMBOL_GPL(videobuf_dma_free); | |
729 | ||
0705135e GL |
730 | EXPORT_SYMBOL_GPL(videobuf_sg_dma_map); |
731 | EXPORT_SYMBOL_GPL(videobuf_sg_dma_unmap); | |
732 | EXPORT_SYMBOL_GPL(videobuf_sg_alloc); | |
7a7d9a89 | 733 | |
0705135e | 734 | EXPORT_SYMBOL_GPL(videobuf_queue_sg_init); |
7a7d9a89 MCC |
735 | |
736 | /* | |
737 | * Local variables: | |
738 | * c-basic-offset: 8 | |
739 | * End: | |
740 | */ |