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