Commit | Line | Data |
---|---|---|
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 | ||
7a7d9a89 MCC |
165 | err = get_user_pages(current,current->mm, |
166 | data & PAGE_MASK, dma->nr_pages, | |
167 | rw == READ, 1, /* force */ | |
168 | dma->pages, NULL); | |
9900132f | 169 | |
7a7d9a89 MCC |
170 | if (err != dma->nr_pages) { |
171 | dma->nr_pages = (err >= 0) ? err : 0; | |
172 | dprintk(1,"get_user_pages: err=%d [%d]\n",err,dma->nr_pages); | |
173 | return err < 0 ? err : -EINVAL; | |
174 | } | |
175 | return 0; | |
176 | } | |
177 | ||
9900132f ML |
178 | int videobuf_dma_init_user(struct videobuf_dmabuf *dma, int direction, |
179 | unsigned long data, unsigned long size) | |
180 | { | |
181 | int ret; | |
182 | down_read(¤t->mm->mmap_sem); | |
183 | ret = videobuf_dma_init_user_locked(dma, direction, data, size); | |
184 | up_read(¤t->mm->mmap_sem); | |
185 | ||
186 | return ret; | |
187 | } | |
188 | ||
7a7d9a89 MCC |
189 | int videobuf_dma_init_kernel(struct videobuf_dmabuf *dma, int direction, |
190 | int nr_pages) | |
191 | { | |
192 | dprintk(1,"init kernel [%d pages]\n",nr_pages); | |
193 | dma->direction = direction; | |
194 | dma->vmalloc = vmalloc_32(nr_pages << PAGE_SHIFT); | |
195 | if (NULL == dma->vmalloc) { | |
196 | dprintk(1,"vmalloc_32(%d pages) failed\n",nr_pages); | |
197 | return -ENOMEM; | |
198 | } | |
199 | dprintk(1,"vmalloc is at addr 0x%08lx, size=%d\n", | |
200 | (unsigned long)dma->vmalloc, | |
201 | nr_pages << PAGE_SHIFT); | |
202 | memset(dma->vmalloc,0,nr_pages << PAGE_SHIFT); | |
203 | dma->nr_pages = nr_pages; | |
204 | return 0; | |
205 | } | |
206 | ||
207 | int videobuf_dma_init_overlay(struct videobuf_dmabuf *dma, int direction, | |
208 | dma_addr_t addr, int nr_pages) | |
209 | { | |
210 | dprintk(1,"init overlay [%d pages @ bus 0x%lx]\n", | |
211 | nr_pages,(unsigned long)addr); | |
212 | dma->direction = direction; | |
213 | if (0 == addr) | |
214 | return -EINVAL; | |
215 | ||
216 | dma->bus_addr = addr; | |
217 | dma->nr_pages = nr_pages; | |
218 | return 0; | |
219 | } | |
220 | ||
0705135e | 221 | int videobuf_dma_map(struct videobuf_queue* q, struct videobuf_dmabuf *dma) |
7a7d9a89 | 222 | { |
7a7d9a89 MCC |
223 | MAGIC_CHECK(dma->magic,MAGIC_DMABUF); |
224 | BUG_ON(0 == dma->nr_pages); | |
225 | ||
226 | if (dma->pages) { | |
227 | dma->sglist = videobuf_pages_to_sg(dma->pages, dma->nr_pages, | |
228 | dma->offset); | |
229 | } | |
230 | if (dma->vmalloc) { | |
231 | dma->sglist = videobuf_vmalloc_to_sg | |
232 | (dma->vmalloc,dma->nr_pages); | |
233 | } | |
234 | if (dma->bus_addr) { | |
235 | dma->sglist = kmalloc(sizeof(struct scatterlist), GFP_KERNEL); | |
236 | if (NULL != dma->sglist) { | |
237 | dma->sglen = 1; | |
238 | sg_dma_address(&dma->sglist[0]) = dma->bus_addr & PAGE_MASK; | |
239 | dma->sglist[0].offset = dma->bus_addr & ~PAGE_MASK; | |
240 | sg_dma_len(&dma->sglist[0]) = dma->nr_pages * PAGE_SIZE; | |
241 | } | |
242 | } | |
243 | if (NULL == dma->sglist) { | |
244 | dprintk(1,"scatterlist is NULL\n"); | |
245 | return -ENOMEM; | |
246 | } | |
247 | if (!dma->bus_addr) { | |
0705135e | 248 | dma->sglen = dma_map_sg(q->dev, dma->sglist, |
7a7d9a89 | 249 | dma->nr_pages, dma->direction); |
7a7d9a89 MCC |
250 | if (0 == dma->sglen) { |
251 | printk(KERN_WARNING | |
7e28adb2 | 252 | "%s: videobuf_map_sg failed\n",__func__); |
7a7d9a89 MCC |
253 | kfree(dma->sglist); |
254 | dma->sglist = NULL; | |
255 | dma->sglen = 0; | |
256 | return -EIO; | |
257 | } | |
258 | } | |
259 | return 0; | |
260 | } | |
261 | ||
0705135e | 262 | int videobuf_dma_sync(struct videobuf_queue *q, struct videobuf_dmabuf *dma) |
7a7d9a89 | 263 | { |
0705135e | 264 | MAGIC_CHECK(dma->magic, MAGIC_DMABUF); |
7a7d9a89 MCC |
265 | BUG_ON(!dma->sglen); |
266 | ||
0705135e | 267 | dma_sync_sg_for_cpu(q->dev, dma->sglist, dma->nr_pages, dma->direction); |
7a7d9a89 MCC |
268 | return 0; |
269 | } | |
270 | ||
271 | int videobuf_dma_unmap(struct videobuf_queue* q,struct videobuf_dmabuf *dma) | |
272 | { | |
0705135e | 273 | MAGIC_CHECK(dma->magic, MAGIC_DMABUF); |
7a7d9a89 MCC |
274 | if (!dma->sglen) |
275 | return 0; | |
276 | ||
0705135e | 277 | dma_unmap_sg(q->dev, dma->sglist, dma->nr_pages, dma->direction); |
5ddff434 | 278 | |
7a7d9a89 MCC |
279 | kfree(dma->sglist); |
280 | dma->sglist = NULL; | |
281 | dma->sglen = 0; | |
282 | return 0; | |
283 | } | |
284 | ||
285 | int videobuf_dma_free(struct videobuf_dmabuf *dma) | |
286 | { | |
287 | MAGIC_CHECK(dma->magic,MAGIC_DMABUF); | |
288 | BUG_ON(dma->sglen); | |
289 | ||
290 | if (dma->pages) { | |
291 | int i; | |
292 | for (i=0; i < dma->nr_pages; i++) | |
293 | page_cache_release(dma->pages[i]); | |
294 | kfree(dma->pages); | |
295 | dma->pages = NULL; | |
296 | } | |
297 | ||
298 | vfree(dma->vmalloc); | |
299 | dma->vmalloc = NULL; | |
7a7d9a89 MCC |
300 | |
301 | if (dma->bus_addr) { | |
302 | dma->bus_addr = 0; | |
303 | } | |
0705135e | 304 | dma->direction = DMA_NONE; |
7a7d9a89 MCC |
305 | return 0; |
306 | } | |
307 | ||
308 | /* --------------------------------------------------------------------- */ | |
309 | ||
0705135e | 310 | int videobuf_sg_dma_map(struct device *dev, struct videobuf_dmabuf *dma) |
7a7d9a89 MCC |
311 | { |
312 | struct videobuf_queue q; | |
7a7d9a89 | 313 | |
0705135e | 314 | q.dev = dev; |
7a7d9a89 | 315 | |
0705135e | 316 | return videobuf_dma_map(&q, dma); |
7a7d9a89 MCC |
317 | } |
318 | ||
0705135e | 319 | int videobuf_sg_dma_unmap(struct device *dev, struct videobuf_dmabuf *dma) |
7a7d9a89 MCC |
320 | { |
321 | struct videobuf_queue q; | |
7a7d9a89 | 322 | |
0705135e | 323 | q.dev = dev; |
7a7d9a89 | 324 | |
0705135e | 325 | return videobuf_dma_unmap(&q, dma); |
7a7d9a89 MCC |
326 | } |
327 | ||
328 | /* --------------------------------------------------------------------- */ | |
329 | ||
330 | static void | |
331 | videobuf_vm_open(struct vm_area_struct *vma) | |
332 | { | |
333 | struct videobuf_mapping *map = vma->vm_private_data; | |
334 | ||
335 | dprintk(2,"vm_open %p [count=%d,vma=%08lx-%08lx]\n",map, | |
336 | map->count,vma->vm_start,vma->vm_end); | |
337 | map->count++; | |
338 | } | |
339 | ||
340 | static void | |
341 | videobuf_vm_close(struct vm_area_struct *vma) | |
342 | { | |
343 | struct videobuf_mapping *map = vma->vm_private_data; | |
344 | struct videobuf_queue *q = map->q; | |
0705135e | 345 | struct videobuf_dma_sg_memory *mem; |
7a7d9a89 MCC |
346 | int i; |
347 | ||
348 | dprintk(2,"vm_close %p [count=%d,vma=%08lx-%08lx]\n",map, | |
349 | map->count,vma->vm_start,vma->vm_end); | |
350 | ||
351 | map->count--; | |
352 | if (0 == map->count) { | |
353 | dprintk(1,"munmap %p q=%p\n",map,q); | |
64f9477f | 354 | mutex_lock(&q->vb_lock); |
7a7d9a89 MCC |
355 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { |
356 | if (NULL == q->bufs[i]) | |
357 | continue; | |
358 | mem=q->bufs[i]->priv; | |
359 | ||
360 | if (!mem) | |
361 | continue; | |
362 | ||
363 | MAGIC_CHECK(mem->magic,MAGIC_SG_MEM); | |
364 | ||
851c0c96 | 365 | if (q->bufs[i]->map != map) |
7a7d9a89 | 366 | continue; |
851c0c96 | 367 | q->bufs[i]->map = NULL; |
7a7d9a89 MCC |
368 | q->bufs[i]->baddr = 0; |
369 | q->ops->buf_release(q,q->bufs[i]); | |
370 | } | |
64f9477f | 371 | mutex_unlock(&q->vb_lock); |
7a7d9a89 MCC |
372 | kfree(map); |
373 | } | |
374 | return; | |
375 | } | |
376 | ||
377 | /* | |
378 | * Get a anonymous page for the mapping. Make sure we can DMA to that | |
379 | * memory location with 32bit PCI devices (i.e. don't use highmem for | |
380 | * now ...). Bounce buffers don't work very well for the data rates | |
381 | * video capture has. | |
382 | */ | |
105354a0 NP |
383 | static int |
384 | videobuf_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) | |
7a7d9a89 MCC |
385 | { |
386 | struct page *page; | |
387 | ||
105354a0 NP |
388 | dprintk(3,"fault: fault @ %08lx [vma %08lx-%08lx]\n", |
389 | (unsigned long)vmf->virtual_address,vma->vm_start,vma->vm_end); | |
7a7d9a89 MCC |
390 | page = alloc_page(GFP_USER | __GFP_DMA32); |
391 | if (!page) | |
105354a0 | 392 | return VM_FAULT_OOM; |
d172b8bd AM |
393 | clear_user_page(page_address(page), (unsigned long)vmf->virtual_address, |
394 | page); | |
105354a0 NP |
395 | vmf->page = page; |
396 | return 0; | |
7a7d9a89 MCC |
397 | } |
398 | ||
399 | static struct vm_operations_struct videobuf_vm_ops = | |
400 | { | |
401 | .open = videobuf_vm_open, | |
402 | .close = videobuf_vm_close, | |
105354a0 | 403 | .fault = videobuf_vm_fault, |
7a7d9a89 MCC |
404 | }; |
405 | ||
406 | /* --------------------------------------------------------------------- | |
0705135e | 407 | * SG handlers for the generic methods |
7a7d9a89 MCC |
408 | */ |
409 | ||
410 | /* Allocated area consists on 3 parts: | |
411 | struct video_buffer | |
412 | struct <driver>_buffer (cx88_buffer, saa7134_buf, ...) | |
0705135e | 413 | struct videobuf_dma_sg_memory |
7a7d9a89 MCC |
414 | */ |
415 | ||
416 | static void *__videobuf_alloc(size_t size) | |
417 | { | |
0705135e | 418 | struct videobuf_dma_sg_memory *mem; |
7a7d9a89 MCC |
419 | struct videobuf_buffer *vb; |
420 | ||
421 | vb = kzalloc(size+sizeof(*mem),GFP_KERNEL); | |
422 | ||
423 | mem = vb->priv = ((char *)vb)+size; | |
424 | mem->magic=MAGIC_SG_MEM; | |
425 | ||
426 | videobuf_dma_init(&mem->dma); | |
427 | ||
428 | dprintk(1,"%s: allocated at %p(%ld+%ld) & %p(%ld)\n", | |
7e28adb2 | 429 | __func__,vb,(long)sizeof(*vb),(long)size-sizeof(*vb), |
7a7d9a89 MCC |
430 | mem,(long)sizeof(*mem)); |
431 | ||
432 | return vb; | |
433 | } | |
434 | ||
435 | static int __videobuf_iolock (struct videobuf_queue* q, | |
436 | struct videobuf_buffer *vb, | |
437 | struct v4l2_framebuffer *fbuf) | |
438 | { | |
439 | int err,pages; | |
440 | dma_addr_t bus; | |
0705135e | 441 | struct videobuf_dma_sg_memory *mem = vb->priv; |
7a7d9a89 MCC |
442 | BUG_ON(!mem); |
443 | ||
0705135e | 444 | MAGIC_CHECK(mem->magic, MAGIC_SG_MEM); |
7a7d9a89 MCC |
445 | |
446 | switch (vb->memory) { | |
447 | case V4L2_MEMORY_MMAP: | |
448 | case V4L2_MEMORY_USERPTR: | |
449 | if (0 == vb->baddr) { | |
450 | /* no userspace addr -- kernel bounce buffer */ | |
451 | pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT; | |
452 | err = videobuf_dma_init_kernel( &mem->dma, | |
0705135e | 453 | DMA_FROM_DEVICE, |
7a7d9a89 MCC |
454 | pages ); |
455 | if (0 != err) | |
456 | return err; | |
9900132f | 457 | } else if (vb->memory == V4L2_MEMORY_USERPTR) { |
7a7d9a89 MCC |
458 | /* dma directly to userspace */ |
459 | err = videobuf_dma_init_user( &mem->dma, | |
0705135e | 460 | DMA_FROM_DEVICE, |
7a7d9a89 MCC |
461 | vb->baddr,vb->bsize ); |
462 | if (0 != err) | |
463 | return err; | |
9900132f ML |
464 | } else { |
465 | /* NOTE: HACK: videobuf_iolock on V4L2_MEMORY_MMAP | |
466 | buffers can only be called from videobuf_qbuf | |
467 | we take current->mm->mmap_sem there, to prevent | |
468 | locking inversion, so don't take it here */ | |
469 | ||
470 | err = videobuf_dma_init_user_locked(&mem->dma, | |
0705135e | 471 | DMA_FROM_DEVICE, |
9900132f ML |
472 | vb->baddr, vb->bsize); |
473 | if (0 != err) | |
474 | return err; | |
7a7d9a89 MCC |
475 | } |
476 | break; | |
477 | case V4L2_MEMORY_OVERLAY: | |
478 | if (NULL == fbuf) | |
479 | return -EINVAL; | |
480 | /* FIXME: need sanity checks for vb->boff */ | |
481 | /* | |
482 | * Using a double cast to avoid compiler warnings when | |
483 | * building for PAE. Compiler doesn't like direct casting | |
484 | * of a 32 bit ptr to 64 bit integer. | |
485 | */ | |
486 | bus = (dma_addr_t)(unsigned long)fbuf->base + vb->boff; | |
487 | pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT; | |
0705135e | 488 | err = videobuf_dma_init_overlay(&mem->dma, DMA_FROM_DEVICE, |
7a7d9a89 MCC |
489 | bus, pages); |
490 | if (0 != err) | |
491 | return err; | |
492 | break; | |
493 | default: | |
494 | BUG(); | |
495 | } | |
0705135e | 496 | err = videobuf_dma_map(q, &mem->dma); |
7a7d9a89 MCC |
497 | if (0 != err) |
498 | return err; | |
499 | ||
500 | return 0; | |
501 | } | |
502 | ||
503 | static int __videobuf_sync(struct videobuf_queue *q, | |
504 | struct videobuf_buffer *buf) | |
505 | { | |
0705135e GL |
506 | struct videobuf_dma_sg_memory *mem = buf->priv; |
507 | BUG_ON(!mem); | |
7a7d9a89 MCC |
508 | MAGIC_CHECK(mem->magic,MAGIC_SG_MEM); |
509 | ||
510 | return videobuf_dma_sync(q,&mem->dma); | |
511 | } | |
512 | ||
513 | static int __videobuf_mmap_free(struct videobuf_queue *q) | |
514 | { | |
515 | int i; | |
516 | ||
517 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { | |
518 | if (q->bufs[i]) { | |
851c0c96 | 519 | if (q->bufs[i]->map) |
7a7d9a89 MCC |
520 | return -EBUSY; |
521 | } | |
522 | } | |
523 | ||
524 | return 0; | |
525 | } | |
526 | ||
527 | static int __videobuf_mmap_mapper(struct videobuf_queue *q, | |
528 | struct vm_area_struct *vma) | |
529 | { | |
0705135e | 530 | struct videobuf_dma_sg_memory *mem; |
7a7d9a89 MCC |
531 | struct videobuf_mapping *map; |
532 | unsigned int first,last,size,i; | |
533 | int retval; | |
534 | ||
535 | retval = -EINVAL; | |
536 | if (!(vma->vm_flags & VM_WRITE)) { | |
537 | dprintk(1,"mmap app bug: PROT_WRITE please\n"); | |
538 | goto done; | |
539 | } | |
540 | if (!(vma->vm_flags & VM_SHARED)) { | |
541 | dprintk(1,"mmap app bug: MAP_SHARED please\n"); | |
542 | goto done; | |
543 | } | |
544 | ||
ce54093c BP |
545 | /* This function maintains backwards compatibility with V4L1 and will |
546 | * map more than one buffer if the vma length is equal to the combined | |
547 | * size of multiple buffers than it will map them together. See | |
548 | * VIDIOCGMBUF in the v4l spec | |
549 | * | |
550 | * TODO: Allow drivers to specify if they support this mode | |
551 | */ | |
552 | ||
7a7d9a89 MCC |
553 | /* look for first buffer to map */ |
554 | for (first = 0; first < VIDEO_MAX_FRAME; first++) { | |
555 | if (NULL == q->bufs[first]) | |
556 | continue; | |
557 | mem=q->bufs[first]->priv; | |
0705135e | 558 | BUG_ON(!mem); |
7a7d9a89 MCC |
559 | MAGIC_CHECK(mem->magic,MAGIC_SG_MEM); |
560 | ||
561 | if (V4L2_MEMORY_MMAP != q->bufs[first]->memory) | |
562 | continue; | |
563 | if (q->bufs[first]->boff == (vma->vm_pgoff << PAGE_SHIFT)) | |
564 | break; | |
565 | } | |
566 | if (VIDEO_MAX_FRAME == first) { | |
567 | dprintk(1,"mmap app bug: offset invalid [offset=0x%lx]\n", | |
568 | (vma->vm_pgoff << PAGE_SHIFT)); | |
569 | goto done; | |
570 | } | |
571 | ||
572 | /* look for last buffer to map */ | |
573 | for (size = 0, last = first; last < VIDEO_MAX_FRAME; last++) { | |
574 | if (NULL == q->bufs[last]) | |
575 | continue; | |
576 | if (V4L2_MEMORY_MMAP != q->bufs[last]->memory) | |
577 | continue; | |
851c0c96 | 578 | if (q->bufs[last]->map) { |
7a7d9a89 MCC |
579 | retval = -EBUSY; |
580 | goto done; | |
581 | } | |
582 | size += q->bufs[last]->bsize; | |
583 | if (size == (vma->vm_end - vma->vm_start)) | |
584 | break; | |
585 | } | |
586 | if (VIDEO_MAX_FRAME == last) { | |
587 | dprintk(1,"mmap app bug: size invalid [size=0x%lx]\n", | |
588 | (vma->vm_end - vma->vm_start)); | |
589 | goto done; | |
590 | } | |
591 | ||
592 | /* create mapping + update buffer list */ | |
593 | retval = -ENOMEM; | |
594 | map = kmalloc(sizeof(struct videobuf_mapping),GFP_KERNEL); | |
595 | if (NULL == map) | |
596 | goto done; | |
ce54093c BP |
597 | |
598 | size = 0; | |
599 | for (i = first; i <= last; i++) { | |
600 | if (NULL == q->bufs[i]) | |
601 | continue; | |
851c0c96 | 602 | q->bufs[i]->map = map; |
7a7d9a89 | 603 | q->bufs[i]->baddr = vma->vm_start + size; |
ce54093c | 604 | size += q->bufs[i]->bsize; |
7a7d9a89 | 605 | } |
ce54093c | 606 | |
7a7d9a89 MCC |
607 | map->count = 1; |
608 | map->start = vma->vm_start; | |
609 | map->end = vma->vm_end; | |
610 | map->q = q; | |
611 | vma->vm_ops = &videobuf_vm_ops; | |
612 | vma->vm_flags |= VM_DONTEXPAND | VM_RESERVED; | |
613 | vma->vm_flags &= ~VM_IO; /* using shared anonymous pages */ | |
614 | vma->vm_private_data = map; | |
615 | dprintk(1,"mmap %p: q=%p %08lx-%08lx pgoff %08lx bufs %d-%d\n", | |
616 | map,q,vma->vm_start,vma->vm_end,vma->vm_pgoff,first,last); | |
617 | retval = 0; | |
618 | ||
619 | done: | |
620 | return retval; | |
621 | } | |
622 | ||
7a7d9a89 MCC |
623 | static int __videobuf_copy_to_user ( struct videobuf_queue *q, |
624 | char __user *data, size_t count, | |
625 | int nonblocking ) | |
626 | { | |
0705135e GL |
627 | struct videobuf_dma_sg_memory *mem = q->read_buf->priv; |
628 | BUG_ON(!mem); | |
7a7d9a89 MCC |
629 | MAGIC_CHECK(mem->magic,MAGIC_SG_MEM); |
630 | ||
631 | /* copy to userspace */ | |
632 | if (count > q->read_buf->size - q->read_off) | |
633 | count = q->read_buf->size - q->read_off; | |
634 | ||
635 | if (copy_to_user(data, mem->dma.vmalloc+q->read_off, count)) | |
636 | return -EFAULT; | |
637 | ||
638 | return count; | |
639 | } | |
640 | ||
641 | static int __videobuf_copy_stream ( struct videobuf_queue *q, | |
642 | char __user *data, size_t count, size_t pos, | |
643 | int vbihack, int nonblocking ) | |
644 | { | |
645 | unsigned int *fc; | |
0705135e GL |
646 | struct videobuf_dma_sg_memory *mem = q->read_buf->priv; |
647 | BUG_ON(!mem); | |
7a7d9a89 MCC |
648 | MAGIC_CHECK(mem->magic,MAGIC_SG_MEM); |
649 | ||
650 | if (vbihack) { | |
651 | /* dirty, undocumented hack -- pass the frame counter | |
652 | * within the last four bytes of each vbi data block. | |
653 | * We need that one to maintain backward compatibility | |
654 | * to all vbi decoding software out there ... */ | |
655 | fc = (unsigned int*)mem->dma.vmalloc; | |
656 | fc += (q->read_buf->size>>2) -1; | |
657 | *fc = q->read_buf->field_count >> 1; | |
658 | dprintk(1,"vbihack: %d\n",*fc); | |
659 | } | |
660 | ||
661 | /* copy stuff using the common method */ | |
662 | count = __videobuf_copy_to_user (q,data,count,nonblocking); | |
663 | ||
664 | if ( (count==-EFAULT) && (0 == pos) ) | |
665 | return -EFAULT; | |
666 | ||
667 | return count; | |
668 | } | |
669 | ||
0705135e | 670 | static struct videobuf_qtype_ops sg_ops = { |
7a7d9a89 MCC |
671 | .magic = MAGIC_QTYPE_OPS, |
672 | ||
673 | .alloc = __videobuf_alloc, | |
674 | .iolock = __videobuf_iolock, | |
675 | .sync = __videobuf_sync, | |
676 | .mmap_free = __videobuf_mmap_free, | |
677 | .mmap_mapper = __videobuf_mmap_mapper, | |
13bcd5d0 | 678 | .video_copy_to_user = __videobuf_copy_to_user, |
7a7d9a89 MCC |
679 | .copy_stream = __videobuf_copy_stream, |
680 | }; | |
681 | ||
0705135e | 682 | void *videobuf_sg_alloc(size_t size) |
7a7d9a89 MCC |
683 | { |
684 | struct videobuf_queue q; | |
685 | ||
686 | /* Required to make generic handler to call __videobuf_alloc */ | |
0705135e | 687 | q.int_ops = &sg_ops; |
7a7d9a89 | 688 | |
0705135e | 689 | q.msize = size; |
7a7d9a89 | 690 | |
0705135e | 691 | return videobuf_alloc(&q); |
7a7d9a89 MCC |
692 | } |
693 | ||
0705135e | 694 | void videobuf_queue_sg_init(struct videobuf_queue* q, |
7a7d9a89 | 695 | struct videobuf_queue_ops *ops, |
0705135e | 696 | struct device *dev, |
7a7d9a89 MCC |
697 | spinlock_t *irqlock, |
698 | enum v4l2_buf_type type, | |
699 | enum v4l2_field field, | |
700 | unsigned int msize, | |
701 | void *priv) | |
702 | { | |
d4cae5a5 | 703 | videobuf_queue_core_init(q, ops, dev, irqlock, type, field, msize, |
0705135e | 704 | priv, &sg_ops); |
7a7d9a89 MCC |
705 | } |
706 | ||
7a7d9a89 MCC |
707 | /* --------------------------------------------------------------------- */ |
708 | ||
709 | EXPORT_SYMBOL_GPL(videobuf_vmalloc_to_sg); | |
710 | ||
711 | EXPORT_SYMBOL_GPL(videobuf_to_dma); | |
712 | EXPORT_SYMBOL_GPL(videobuf_dma_init); | |
713 | EXPORT_SYMBOL_GPL(videobuf_dma_init_user); | |
714 | EXPORT_SYMBOL_GPL(videobuf_dma_init_kernel); | |
715 | EXPORT_SYMBOL_GPL(videobuf_dma_init_overlay); | |
716 | EXPORT_SYMBOL_GPL(videobuf_dma_map); | |
717 | EXPORT_SYMBOL_GPL(videobuf_dma_sync); | |
718 | EXPORT_SYMBOL_GPL(videobuf_dma_unmap); | |
719 | EXPORT_SYMBOL_GPL(videobuf_dma_free); | |
720 | ||
0705135e GL |
721 | EXPORT_SYMBOL_GPL(videobuf_sg_dma_map); |
722 | EXPORT_SYMBOL_GPL(videobuf_sg_dma_unmap); | |
723 | EXPORT_SYMBOL_GPL(videobuf_sg_alloc); | |
7a7d9a89 | 724 | |
0705135e | 725 | EXPORT_SYMBOL_GPL(videobuf_queue_sg_init); |
7a7d9a89 MCC |
726 | |
727 | /* | |
728 | * Local variables: | |
729 | * c-basic-offset: 8 | |
730 | * End: | |
731 | */ |