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> | |
d43c36dc | 24 | #include <linux/sched.h> |
7a7d9a89 MCC |
25 | #include <linux/slab.h> |
26 | #include <linux/interrupt.h> | |
27 | ||
0705135e | 28 | #include <linux/dma-mapping.h> |
7a7d9a89 MCC |
29 | #include <linux/vmalloc.h> |
30 | #include <linux/pagemap.h> | |
11763609 | 31 | #include <linux/scatterlist.h> |
7a7d9a89 MCC |
32 | #include <asm/page.h> |
33 | #include <asm/pgtable.h> | |
34 | ||
35 | #include <media/videobuf-dma-sg.h> | |
36 | ||
37 | #define MAGIC_DMABUF 0x19721112 | |
38 | #define MAGIC_SG_MEM 0x17890714 | |
39 | ||
7a02264c PO |
40 | #define MAGIC_CHECK(is, should) \ |
41 | if (unlikely((is) != (should))) { \ | |
42 | printk(KERN_ERR "magic mismatch: %x (expected %x)\n", \ | |
43 | is, should); \ | |
44 | BUG(); \ | |
45 | } | |
7a7d9a89 | 46 | |
ff699e6b | 47 | static int debug; |
7a7d9a89 MCC |
48 | module_param(debug, int, 0644); |
49 | ||
0705135e | 50 | MODULE_DESCRIPTION("helper module to manage video4linux dma sg buffers"); |
7a7d9a89 MCC |
51 | MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>"); |
52 | MODULE_LICENSE("GPL"); | |
53 | ||
7a02264c PO |
54 | #define dprintk(level, fmt, arg...) \ |
55 | if (debug >= level) \ | |
56 | printk(KERN_DEBUG "vbuf-sg: " fmt , ## arg) | |
7a7d9a89 MCC |
57 | |
58 | /* --------------------------------------------------------------------- */ | |
59 | ||
7181772d LP |
60 | /* |
61 | * Return a scatterlist for some page-aligned vmalloc()'ed memory | |
62 | * block (NULL on errors). Memory for the scatterlist is allocated | |
63 | * using kmalloc. The caller must free the memory. | |
64 | */ | |
65 | static struct scatterlist *videobuf_vmalloc_to_sg(unsigned char *virt, | |
66 | int nr_pages) | |
7a7d9a89 MCC |
67 | { |
68 | struct scatterlist *sglist; | |
69 | struct page *pg; | |
70 | int i; | |
71 | ||
101b25b5 | 72 | sglist = vzalloc(nr_pages * sizeof(*sglist)); |
7a7d9a89 MCC |
73 | if (NULL == sglist) |
74 | return NULL; | |
45711f1a | 75 | sg_init_table(sglist, nr_pages); |
7a7d9a89 MCC |
76 | for (i = 0; i < nr_pages; i++, virt += PAGE_SIZE) { |
77 | pg = vmalloc_to_page(virt); | |
78 | if (NULL == pg) | |
79 | goto err; | |
80 | BUG_ON(PageHighMem(pg)); | |
642f1490 | 81 | sg_set_page(&sglist[i], pg, PAGE_SIZE, 0); |
7a7d9a89 MCC |
82 | } |
83 | return sglist; | |
84 | ||
7a02264c | 85 | err: |
1010ed13 | 86 | vfree(sglist); |
7a7d9a89 MCC |
87 | return NULL; |
88 | } | |
89 | ||
7181772d LP |
90 | /* |
91 | * Return a scatterlist for a an array of userpages (NULL on errors). | |
92 | * Memory for the scatterlist is allocated using kmalloc. The caller | |
93 | * must free the memory. | |
94 | */ | |
95 | static struct scatterlist *videobuf_pages_to_sg(struct page **pages, | |
2fc11536 | 96 | int nr_pages, int offset, size_t size) |
7a7d9a89 MCC |
97 | { |
98 | struct scatterlist *sglist; | |
a47cacbd | 99 | int i; |
7a7d9a89 MCC |
100 | |
101 | if (NULL == pages[0]) | |
102 | return NULL; | |
1010ed13 | 103 | sglist = vmalloc(nr_pages * sizeof(*sglist)); |
7a7d9a89 MCC |
104 | if (NULL == sglist) |
105 | return NULL; | |
45711f1a | 106 | sg_init_table(sglist, nr_pages); |
7a7d9a89 | 107 | |
7a7d9a89 MCC |
108 | if (PageHighMem(pages[0])) |
109 | /* DMA to highmem pages might not work */ | |
110 | goto highmem; | |
642f1490 | 111 | sg_set_page(&sglist[0], pages[0], PAGE_SIZE - offset, offset); |
2fc11536 | 112 | size -= PAGE_SIZE - offset; |
7a7d9a89 MCC |
113 | for (i = 1; i < nr_pages; i++) { |
114 | if (NULL == pages[i]) | |
115 | goto nopage; | |
116 | if (PageHighMem(pages[i])) | |
117 | goto highmem; | |
1bede752 MCC |
118 | sg_set_page(&sglist[i], pages[i], min_t(size_t, PAGE_SIZE, size), 0); |
119 | size -= min_t(size_t, PAGE_SIZE, size); | |
7a7d9a89 MCC |
120 | } |
121 | return sglist; | |
122 | ||
7a02264c PO |
123 | nopage: |
124 | dprintk(2, "sgl: oops - no page\n"); | |
1010ed13 | 125 | vfree(sglist); |
7a7d9a89 MCC |
126 | return NULL; |
127 | ||
7a02264c PO |
128 | highmem: |
129 | dprintk(2, "sgl: oops - highmem page\n"); | |
1010ed13 | 130 | vfree(sglist); |
7a7d9a89 MCC |
131 | return NULL; |
132 | } | |
133 | ||
134 | /* --------------------------------------------------------------------- */ | |
135 | ||
7a02264c | 136 | struct videobuf_dmabuf *videobuf_to_dma(struct videobuf_buffer *buf) |
7a7d9a89 | 137 | { |
0705135e GL |
138 | struct videobuf_dma_sg_memory *mem = buf->priv; |
139 | BUG_ON(!mem); | |
7a7d9a89 | 140 | |
0705135e | 141 | MAGIC_CHECK(mem->magic, MAGIC_SG_MEM); |
7a7d9a89 MCC |
142 | |
143 | return &mem->dma; | |
144 | } | |
7a02264c | 145 | EXPORT_SYMBOL_GPL(videobuf_to_dma); |
7a7d9a89 MCC |
146 | |
147 | void videobuf_dma_init(struct videobuf_dmabuf *dma) | |
148 | { | |
7a02264c | 149 | memset(dma, 0, sizeof(*dma)); |
7a7d9a89 MCC |
150 | dma->magic = MAGIC_DMABUF; |
151 | } | |
7a02264c | 152 | EXPORT_SYMBOL_GPL(videobuf_dma_init); |
7a7d9a89 | 153 | |
9900132f ML |
154 | static int videobuf_dma_init_user_locked(struct videobuf_dmabuf *dma, |
155 | int direction, unsigned long data, unsigned long size) | |
7a7d9a89 | 156 | { |
7a02264c | 157 | unsigned long first, last; |
7a7d9a89 MCC |
158 | int err, rw = 0; |
159 | ||
160 | dma->direction = direction; | |
161 | switch (dma->direction) { | |
0705135e GL |
162 | case DMA_FROM_DEVICE: |
163 | rw = READ; | |
164 | break; | |
165 | case DMA_TO_DEVICE: | |
166 | rw = WRITE; | |
167 | break; | |
168 | default: | |
169 | BUG(); | |
7a7d9a89 MCC |
170 | } |
171 | ||
172 | first = (data & PAGE_MASK) >> PAGE_SHIFT; | |
173 | last = ((data+size-1) & PAGE_MASK) >> PAGE_SHIFT; | |
2fc11536 HV |
174 | dma->offset = data & ~PAGE_MASK; |
175 | dma->size = size; | |
7a7d9a89 | 176 | dma->nr_pages = last-first+1; |
7a02264c | 177 | dma->pages = kmalloc(dma->nr_pages * sizeof(struct page *), GFP_KERNEL); |
7a7d9a89 MCC |
178 | if (NULL == dma->pages) |
179 | return -ENOMEM; | |
7a7d9a89 | 180 | |
7a02264c PO |
181 | dprintk(1, "init user [0x%lx+0x%lx => %d pages]\n", |
182 | data, size, dma->nr_pages); | |
183 | ||
184 | err = get_user_pages(current, current->mm, | |
7a7d9a89 MCC |
185 | data & PAGE_MASK, dma->nr_pages, |
186 | rw == READ, 1, /* force */ | |
187 | dma->pages, NULL); | |
9900132f | 188 | |
7a7d9a89 MCC |
189 | if (err != dma->nr_pages) { |
190 | dma->nr_pages = (err >= 0) ? err : 0; | |
7a02264c | 191 | dprintk(1, "get_user_pages: err=%d [%d]\n", err, dma->nr_pages); |
7a7d9a89 MCC |
192 | return err < 0 ? err : -EINVAL; |
193 | } | |
194 | return 0; | |
195 | } | |
196 | ||
9900132f ML |
197 | int videobuf_dma_init_user(struct videobuf_dmabuf *dma, int direction, |
198 | unsigned long data, unsigned long size) | |
199 | { | |
200 | int ret; | |
7a02264c | 201 | |
9900132f ML |
202 | down_read(¤t->mm->mmap_sem); |
203 | ret = videobuf_dma_init_user_locked(dma, direction, data, size); | |
204 | up_read(¤t->mm->mmap_sem); | |
205 | ||
206 | return ret; | |
207 | } | |
7a02264c | 208 | EXPORT_SYMBOL_GPL(videobuf_dma_init_user); |
9900132f | 209 | |
7a7d9a89 MCC |
210 | int videobuf_dma_init_kernel(struct videobuf_dmabuf *dma, int direction, |
211 | int nr_pages) | |
212 | { | |
7a02264c PO |
213 | dprintk(1, "init kernel [%d pages]\n", nr_pages); |
214 | ||
7a7d9a89 | 215 | dma->direction = direction; |
bb6dbe74 LP |
216 | dma->vaddr = vmalloc_32(nr_pages << PAGE_SHIFT); |
217 | if (NULL == dma->vaddr) { | |
7a02264c | 218 | dprintk(1, "vmalloc_32(%d pages) failed\n", nr_pages); |
7a7d9a89 MCC |
219 | return -ENOMEM; |
220 | } | |
7a02264c PO |
221 | |
222 | dprintk(1, "vmalloc is at addr 0x%08lx, size=%d\n", | |
bb6dbe74 | 223 | (unsigned long)dma->vaddr, |
7a7d9a89 | 224 | nr_pages << PAGE_SHIFT); |
7a02264c | 225 | |
bb6dbe74 | 226 | memset(dma->vaddr, 0, nr_pages << PAGE_SHIFT); |
7a7d9a89 | 227 | dma->nr_pages = nr_pages; |
7a02264c | 228 | |
7a7d9a89 MCC |
229 | return 0; |
230 | } | |
7a02264c | 231 | EXPORT_SYMBOL_GPL(videobuf_dma_init_kernel); |
7a7d9a89 MCC |
232 | |
233 | int videobuf_dma_init_overlay(struct videobuf_dmabuf *dma, int direction, | |
234 | dma_addr_t addr, int nr_pages) | |
235 | { | |
7a02264c PO |
236 | dprintk(1, "init overlay [%d pages @ bus 0x%lx]\n", |
237 | nr_pages, (unsigned long)addr); | |
7a7d9a89 | 238 | dma->direction = direction; |
7a02264c | 239 | |
7a7d9a89 MCC |
240 | if (0 == addr) |
241 | return -EINVAL; | |
242 | ||
243 | dma->bus_addr = addr; | |
244 | dma->nr_pages = nr_pages; | |
7a02264c | 245 | |
7a7d9a89 MCC |
246 | return 0; |
247 | } | |
7a02264c | 248 | EXPORT_SYMBOL_GPL(videobuf_dma_init_overlay); |
7a7d9a89 | 249 | |
95268403 | 250 | int videobuf_dma_map(struct device *dev, struct videobuf_dmabuf *dma) |
7a7d9a89 | 251 | { |
7a02264c | 252 | MAGIC_CHECK(dma->magic, MAGIC_DMABUF); |
7a7d9a89 MCC |
253 | BUG_ON(0 == dma->nr_pages); |
254 | ||
255 | if (dma->pages) { | |
256 | dma->sglist = videobuf_pages_to_sg(dma->pages, dma->nr_pages, | |
2fc11536 | 257 | dma->offset, dma->size); |
7a7d9a89 | 258 | } |
bb6dbe74 LP |
259 | if (dma->vaddr) { |
260 | dma->sglist = videobuf_vmalloc_to_sg(dma->vaddr, | |
7a02264c | 261 | dma->nr_pages); |
7a7d9a89 MCC |
262 | } |
263 | if (dma->bus_addr) { | |
1010ed13 | 264 | dma->sglist = vmalloc(sizeof(*dma->sglist)); |
7a7d9a89 | 265 | if (NULL != dma->sglist) { |
7a02264c PO |
266 | dma->sglen = 1; |
267 | sg_dma_address(&dma->sglist[0]) = dma->bus_addr | |
268 | & PAGE_MASK; | |
269 | dma->sglist[0].offset = dma->bus_addr & ~PAGE_MASK; | |
270 | sg_dma_len(&dma->sglist[0]) = dma->nr_pages * PAGE_SIZE; | |
7a7d9a89 MCC |
271 | } |
272 | } | |
273 | if (NULL == dma->sglist) { | |
7a02264c | 274 | dprintk(1, "scatterlist is NULL\n"); |
7a7d9a89 MCC |
275 | return -ENOMEM; |
276 | } | |
277 | if (!dma->bus_addr) { | |
95268403 | 278 | dma->sglen = dma_map_sg(dev, dma->sglist, |
7a7d9a89 | 279 | dma->nr_pages, dma->direction); |
7a7d9a89 MCC |
280 | if (0 == dma->sglen) { |
281 | printk(KERN_WARNING | |
7a02264c | 282 | "%s: videobuf_map_sg failed\n", __func__); |
1010ed13 | 283 | vfree(dma->sglist); |
7a7d9a89 MCC |
284 | dma->sglist = NULL; |
285 | dma->sglen = 0; | |
92051b28 | 286 | return -ENOMEM; |
7a7d9a89 MCC |
287 | } |
288 | } | |
7a02264c | 289 | |
7a7d9a89 MCC |
290 | return 0; |
291 | } | |
7a02264c | 292 | EXPORT_SYMBOL_GPL(videobuf_dma_map); |
7a7d9a89 | 293 | |
95268403 | 294 | int videobuf_dma_unmap(struct device *dev, struct videobuf_dmabuf *dma) |
7a7d9a89 | 295 | { |
0705135e | 296 | MAGIC_CHECK(dma->magic, MAGIC_DMABUF); |
7a02264c | 297 | |
7a7d9a89 MCC |
298 | if (!dma->sglen) |
299 | return 0; | |
300 | ||
95268403 | 301 | dma_unmap_sg(dev, dma->sglist, dma->sglen, dma->direction); |
5ddff434 | 302 | |
1010ed13 | 303 | vfree(dma->sglist); |
7a7d9a89 MCC |
304 | dma->sglist = NULL; |
305 | dma->sglen = 0; | |
7a02264c | 306 | |
7a7d9a89 MCC |
307 | return 0; |
308 | } | |
7a02264c | 309 | EXPORT_SYMBOL_GPL(videobuf_dma_unmap); |
7a7d9a89 MCC |
310 | |
311 | int videobuf_dma_free(struct videobuf_dmabuf *dma) | |
312 | { | |
7a02264c PO |
313 | int i; |
314 | MAGIC_CHECK(dma->magic, MAGIC_DMABUF); | |
7a7d9a89 MCC |
315 | BUG_ON(dma->sglen); |
316 | ||
317 | if (dma->pages) { | |
7a02264c | 318 | for (i = 0; i < dma->nr_pages; i++) |
7a7d9a89 MCC |
319 | page_cache_release(dma->pages[i]); |
320 | kfree(dma->pages); | |
321 | dma->pages = NULL; | |
322 | } | |
323 | ||
bb6dbe74 LP |
324 | vfree(dma->vaddr); |
325 | dma->vaddr = NULL; | |
7a7d9a89 | 326 | |
7a02264c | 327 | if (dma->bus_addr) |
7a7d9a89 | 328 | dma->bus_addr = 0; |
0705135e | 329 | dma->direction = DMA_NONE; |
7a02264c | 330 | |
7a7d9a89 MCC |
331 | return 0; |
332 | } | |
7a02264c | 333 | EXPORT_SYMBOL_GPL(videobuf_dma_free); |
7a7d9a89 MCC |
334 | |
335 | /* --------------------------------------------------------------------- */ | |
336 | ||
7a02264c | 337 | static void videobuf_vm_open(struct vm_area_struct *vma) |
7a7d9a89 MCC |
338 | { |
339 | struct videobuf_mapping *map = vma->vm_private_data; | |
340 | ||
7a02264c PO |
341 | dprintk(2, "vm_open %p [count=%d,vma=%08lx-%08lx]\n", map, |
342 | map->count, vma->vm_start, vma->vm_end); | |
343 | ||
7a7d9a89 MCC |
344 | map->count++; |
345 | } | |
346 | ||
7a02264c | 347 | static void videobuf_vm_close(struct vm_area_struct *vma) |
7a7d9a89 MCC |
348 | { |
349 | struct videobuf_mapping *map = vma->vm_private_data; | |
350 | struct videobuf_queue *q = map->q; | |
0705135e | 351 | struct videobuf_dma_sg_memory *mem; |
7a7d9a89 MCC |
352 | int i; |
353 | ||
7a02264c PO |
354 | dprintk(2, "vm_close %p [count=%d,vma=%08lx-%08lx]\n", map, |
355 | map->count, vma->vm_start, vma->vm_end); | |
7a7d9a89 MCC |
356 | |
357 | map->count--; | |
358 | if (0 == map->count) { | |
7a02264c | 359 | dprintk(1, "munmap %p q=%p\n", map, q); |
97397687 | 360 | videobuf_queue_lock(q); |
7a7d9a89 MCC |
361 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { |
362 | if (NULL == q->bufs[i]) | |
363 | continue; | |
7a02264c | 364 | mem = q->bufs[i]->priv; |
7a7d9a89 MCC |
365 | if (!mem) |
366 | continue; | |
367 | ||
7a02264c | 368 | MAGIC_CHECK(mem->magic, MAGIC_SG_MEM); |
7a7d9a89 | 369 | |
851c0c96 | 370 | if (q->bufs[i]->map != map) |
7a7d9a89 | 371 | continue; |
851c0c96 | 372 | q->bufs[i]->map = NULL; |
7a7d9a89 | 373 | q->bufs[i]->baddr = 0; |
7a02264c | 374 | q->ops->buf_release(q, q->bufs[i]); |
7a7d9a89 | 375 | } |
97397687 | 376 | videobuf_queue_unlock(q); |
7a7d9a89 MCC |
377 | kfree(map); |
378 | } | |
379 | return; | |
380 | } | |
381 | ||
382 | /* | |
383 | * Get a anonymous page for the mapping. Make sure we can DMA to that | |
384 | * memory location with 32bit PCI devices (i.e. don't use highmem for | |
385 | * now ...). Bounce buffers don't work very well for the data rates | |
386 | * video capture has. | |
387 | */ | |
7a02264c | 388 | static int videobuf_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
7a7d9a89 MCC |
389 | { |
390 | struct page *page; | |
391 | ||
7a02264c PO |
392 | dprintk(3, "fault: fault @ %08lx [vma %08lx-%08lx]\n", |
393 | (unsigned long)vmf->virtual_address, | |
394 | vma->vm_start, vma->vm_end); | |
395 | ||
7a7d9a89 MCC |
396 | page = alloc_page(GFP_USER | __GFP_DMA32); |
397 | if (!page) | |
105354a0 | 398 | return VM_FAULT_OOM; |
c0cd5010 | 399 | clear_user_highpage(page, (unsigned long)vmf->virtual_address); |
105354a0 | 400 | vmf->page = page; |
7a02264c | 401 | |
105354a0 | 402 | return 0; |
7a7d9a89 MCC |
403 | } |
404 | ||
7a02264c PO |
405 | static const struct vm_operations_struct videobuf_vm_ops = { |
406 | .open = videobuf_vm_open, | |
407 | .close = videobuf_vm_close, | |
408 | .fault = videobuf_vm_fault, | |
7a7d9a89 MCC |
409 | }; |
410 | ||
411 | /* --------------------------------------------------------------------- | |
0705135e | 412 | * SG handlers for the generic methods |
7a7d9a89 MCC |
413 | */ |
414 | ||
415 | /* Allocated area consists on 3 parts: | |
416 | struct video_buffer | |
417 | struct <driver>_buffer (cx88_buffer, saa7134_buf, ...) | |
0705135e | 418 | struct videobuf_dma_sg_memory |
7a7d9a89 MCC |
419 | */ |
420 | ||
33c38283 | 421 | static struct videobuf_buffer *__videobuf_alloc_vb(size_t size) |
7a7d9a89 | 422 | { |
0705135e | 423 | struct videobuf_dma_sg_memory *mem; |
7a7d9a89 MCC |
424 | struct videobuf_buffer *vb; |
425 | ||
7a02264c | 426 | vb = kzalloc(size + sizeof(*mem), GFP_KERNEL); |
bee527f9 PO |
427 | if (!vb) |
428 | return vb; | |
7a7d9a89 | 429 | |
7a02264c PO |
430 | mem = vb->priv = ((char *)vb) + size; |
431 | mem->magic = MAGIC_SG_MEM; | |
7a7d9a89 MCC |
432 | |
433 | videobuf_dma_init(&mem->dma); | |
434 | ||
7a02264c PO |
435 | dprintk(1, "%s: allocated at %p(%ld+%ld) & %p(%ld)\n", |
436 | __func__, vb, (long)sizeof(*vb), (long)size - sizeof(*vb), | |
437 | mem, (long)sizeof(*mem)); | |
7a7d9a89 MCC |
438 | |
439 | return vb; | |
440 | } | |
441 | ||
037c75eb | 442 | static void *__videobuf_to_vaddr(struct videobuf_buffer *buf) |
59d34489 MCC |
443 | { |
444 | struct videobuf_dma_sg_memory *mem = buf->priv; | |
445 | BUG_ON(!mem); | |
446 | ||
447 | MAGIC_CHECK(mem->magic, MAGIC_SG_MEM); | |
448 | ||
bb6dbe74 | 449 | return mem->dma.vaddr; |
59d34489 MCC |
450 | } |
451 | ||
7a02264c PO |
452 | static int __videobuf_iolock(struct videobuf_queue *q, |
453 | struct videobuf_buffer *vb, | |
454 | struct v4l2_framebuffer *fbuf) | |
7a7d9a89 | 455 | { |
7a02264c | 456 | int err, pages; |
7a7d9a89 | 457 | dma_addr_t bus; |
0705135e | 458 | struct videobuf_dma_sg_memory *mem = vb->priv; |
7a7d9a89 MCC |
459 | BUG_ON(!mem); |
460 | ||
0705135e | 461 | MAGIC_CHECK(mem->magic, MAGIC_SG_MEM); |
7a7d9a89 MCC |
462 | |
463 | switch (vb->memory) { | |
464 | case V4L2_MEMORY_MMAP: | |
465 | case V4L2_MEMORY_USERPTR: | |
466 | if (0 == vb->baddr) { | |
467 | /* no userspace addr -- kernel bounce buffer */ | |
468 | pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT; | |
7a02264c PO |
469 | err = videobuf_dma_init_kernel(&mem->dma, |
470 | DMA_FROM_DEVICE, | |
471 | pages); | |
7a7d9a89 MCC |
472 | if (0 != err) |
473 | return err; | |
9900132f | 474 | } else if (vb->memory == V4L2_MEMORY_USERPTR) { |
7a7d9a89 | 475 | /* dma directly to userspace */ |
7a02264c PO |
476 | err = videobuf_dma_init_user(&mem->dma, |
477 | DMA_FROM_DEVICE, | |
478 | vb->baddr, vb->bsize); | |
7a7d9a89 MCC |
479 | if (0 != err) |
480 | return err; | |
9900132f ML |
481 | } else { |
482 | /* NOTE: HACK: videobuf_iolock on V4L2_MEMORY_MMAP | |
483 | buffers can only be called from videobuf_qbuf | |
484 | we take current->mm->mmap_sem there, to prevent | |
485 | locking inversion, so don't take it here */ | |
486 | ||
487 | err = videobuf_dma_init_user_locked(&mem->dma, | |
0705135e | 488 | DMA_FROM_DEVICE, |
9900132f ML |
489 | vb->baddr, vb->bsize); |
490 | if (0 != err) | |
491 | return err; | |
7a7d9a89 MCC |
492 | } |
493 | break; | |
494 | case V4L2_MEMORY_OVERLAY: | |
495 | if (NULL == fbuf) | |
496 | return -EINVAL; | |
497 | /* FIXME: need sanity checks for vb->boff */ | |
498 | /* | |
499 | * Using a double cast to avoid compiler warnings when | |
500 | * building for PAE. Compiler doesn't like direct casting | |
501 | * of a 32 bit ptr to 64 bit integer. | |
502 | */ | |
503 | bus = (dma_addr_t)(unsigned long)fbuf->base + vb->boff; | |
504 | pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT; | |
0705135e | 505 | err = videobuf_dma_init_overlay(&mem->dma, DMA_FROM_DEVICE, |
7a7d9a89 MCC |
506 | bus, pages); |
507 | if (0 != err) | |
508 | return err; | |
509 | break; | |
510 | default: | |
511 | BUG(); | |
512 | } | |
95268403 | 513 | err = videobuf_dma_map(q->dev, &mem->dma); |
7a7d9a89 MCC |
514 | if (0 != err) |
515 | return err; | |
516 | ||
517 | return 0; | |
518 | } | |
519 | ||
520 | static int __videobuf_sync(struct videobuf_queue *q, | |
521 | struct videobuf_buffer *buf) | |
522 | { | |
0705135e | 523 | struct videobuf_dma_sg_memory *mem = buf->priv; |
97f8105d MCC |
524 | BUG_ON(!mem || !mem->dma.sglen); |
525 | ||
7a02264c | 526 | MAGIC_CHECK(mem->magic, MAGIC_SG_MEM); |
97f8105d | 527 | MAGIC_CHECK(mem->dma.magic, MAGIC_DMABUF); |
7a7d9a89 | 528 | |
97f8105d | 529 | dma_sync_sg_for_cpu(q->dev, mem->dma.sglist, |
fc7f8fd4 | 530 | mem->dma.sglen, mem->dma.direction); |
97f8105d MCC |
531 | |
532 | return 0; | |
7a7d9a89 MCC |
533 | } |
534 | ||
7a7d9a89 | 535 | static int __videobuf_mmap_mapper(struct videobuf_queue *q, |
0b62b737 HV |
536 | struct videobuf_buffer *buf, |
537 | struct vm_area_struct *vma) | |
7a7d9a89 | 538 | { |
0b62b737 | 539 | struct videobuf_dma_sg_memory *mem = buf->priv; |
7a7d9a89 | 540 | struct videobuf_mapping *map; |
474675ad | 541 | unsigned int first, last, size = 0, i; |
7a7d9a89 MCC |
542 | int retval; |
543 | ||
544 | retval = -EINVAL; | |
7a7d9a89 | 545 | |
ce54093c BP |
546 | /* This function maintains backwards compatibility with V4L1 and will |
547 | * map more than one buffer if the vma length is equal to the combined | |
548 | * size of multiple buffers than it will map them together. See | |
549 | * VIDIOCGMBUF in the v4l spec | |
550 | * | |
551 | * TODO: Allow drivers to specify if they support this mode | |
552 | */ | |
553 | ||
0b62b737 HV |
554 | BUG_ON(!mem); |
555 | MAGIC_CHECK(mem->magic, MAGIC_SG_MEM); | |
556 | ||
7a7d9a89 MCC |
557 | /* look for first buffer to map */ |
558 | for (first = 0; first < VIDEO_MAX_FRAME; first++) { | |
0b62b737 HV |
559 | if (buf == q->bufs[first]) { |
560 | size = PAGE_ALIGN(q->bufs[first]->bsize); | |
7a7d9a89 | 561 | break; |
0b62b737 | 562 | } |
7a7d9a89 | 563 | } |
0b62b737 HV |
564 | |
565 | /* paranoia, should never happen since buf is always valid. */ | |
474675ad | 566 | if (!size) { |
7a02264c | 567 | dprintk(1, "mmap app bug: offset invalid [offset=0x%lx]\n", |
0b62b737 | 568 | (vma->vm_pgoff << PAGE_SHIFT)); |
7a7d9a89 MCC |
569 | goto done; |
570 | } | |
571 | ||
0b62b737 | 572 | last = first; |
7a7d9a89 MCC |
573 | |
574 | /* create mapping + update buffer list */ | |
575 | retval = -ENOMEM; | |
7a02264c | 576 | map = kmalloc(sizeof(struct videobuf_mapping), GFP_KERNEL); |
7a7d9a89 MCC |
577 | if (NULL == map) |
578 | goto done; | |
ce54093c BP |
579 | |
580 | size = 0; | |
581 | for (i = first; i <= last; i++) { | |
582 | if (NULL == q->bufs[i]) | |
583 | continue; | |
851c0c96 | 584 | q->bufs[i]->map = map; |
7a7d9a89 | 585 | q->bufs[i]->baddr = vma->vm_start + size; |
7cbefad0 | 586 | size += PAGE_ALIGN(q->bufs[i]->bsize); |
7a7d9a89 | 587 | } |
ce54093c | 588 | |
7a7d9a89 | 589 | map->count = 1; |
7a7d9a89 MCC |
590 | map->q = q; |
591 | vma->vm_ops = &videobuf_vm_ops; | |
592 | vma->vm_flags |= VM_DONTEXPAND | VM_RESERVED; | |
593 | vma->vm_flags &= ~VM_IO; /* using shared anonymous pages */ | |
594 | vma->vm_private_data = map; | |
7a02264c PO |
595 | dprintk(1, "mmap %p: q=%p %08lx-%08lx pgoff %08lx bufs %d-%d\n", |
596 | map, q, vma->vm_start, vma->vm_end, vma->vm_pgoff, first, last); | |
7a7d9a89 MCC |
597 | retval = 0; |
598 | ||
7a02264c | 599 | done: |
7a7d9a89 MCC |
600 | return retval; |
601 | } | |
602 | ||
0705135e | 603 | static struct videobuf_qtype_ops sg_ops = { |
7a7d9a89 MCC |
604 | .magic = MAGIC_QTYPE_OPS, |
605 | ||
33c38283 | 606 | .alloc_vb = __videobuf_alloc_vb, |
7a7d9a89 MCC |
607 | .iolock = __videobuf_iolock, |
608 | .sync = __videobuf_sync, | |
7a7d9a89 | 609 | .mmap_mapper = __videobuf_mmap_mapper, |
037c75eb | 610 | .vaddr = __videobuf_to_vaddr, |
7a7d9a89 MCC |
611 | }; |
612 | ||
0705135e | 613 | void *videobuf_sg_alloc(size_t size) |
7a7d9a89 MCC |
614 | { |
615 | struct videobuf_queue q; | |
616 | ||
617 | /* Required to make generic handler to call __videobuf_alloc */ | |
0705135e | 618 | q.int_ops = &sg_ops; |
7a7d9a89 | 619 | |
0705135e | 620 | q.msize = size; |
7a7d9a89 | 621 | |
33c38283 | 622 | return videobuf_alloc_vb(&q); |
7a7d9a89 | 623 | } |
7a02264c | 624 | EXPORT_SYMBOL_GPL(videobuf_sg_alloc); |
7a7d9a89 | 625 | |
7a02264c | 626 | void videobuf_queue_sg_init(struct videobuf_queue *q, |
38a54f35 | 627 | const struct videobuf_queue_ops *ops, |
0705135e | 628 | struct device *dev, |
7a7d9a89 MCC |
629 | spinlock_t *irqlock, |
630 | enum v4l2_buf_type type, | |
631 | enum v4l2_field field, | |
632 | unsigned int msize, | |
08bff03e HV |
633 | void *priv, |
634 | struct mutex *ext_lock) | |
7a7d9a89 | 635 | { |
d4cae5a5 | 636 | videobuf_queue_core_init(q, ops, dev, irqlock, type, field, msize, |
08bff03e | 637 | priv, &sg_ops, ext_lock); |
7a7d9a89 | 638 | } |
0705135e | 639 | EXPORT_SYMBOL_GPL(videobuf_queue_sg_init); |
7a7d9a89 | 640 |