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 | ||
1010ed13 | 72 | sglist = vmalloc(nr_pages * sizeof(*sglist)); |
7a7d9a89 MCC |
73 | if (NULL == sglist) |
74 | return NULL; | |
1010ed13 | 75 | memset(sglist, 0, nr_pages * sizeof(*sglist)); |
45711f1a | 76 | sg_init_table(sglist, nr_pages); |
7a7d9a89 MCC |
77 | for (i = 0; i < nr_pages; i++, virt += PAGE_SIZE) { |
78 | pg = vmalloc_to_page(virt); | |
79 | if (NULL == pg) | |
80 | goto err; | |
81 | BUG_ON(PageHighMem(pg)); | |
642f1490 | 82 | sg_set_page(&sglist[i], pg, PAGE_SIZE, 0); |
7a7d9a89 MCC |
83 | } |
84 | return sglist; | |
85 | ||
7a02264c | 86 | err: |
1010ed13 | 87 | vfree(sglist); |
7a7d9a89 MCC |
88 | return NULL; |
89 | } | |
90 | ||
7181772d LP |
91 | /* |
92 | * Return a scatterlist for a an array of userpages (NULL on errors). | |
93 | * Memory for the scatterlist is allocated using kmalloc. The caller | |
94 | * must free the memory. | |
95 | */ | |
96 | static struct scatterlist *videobuf_pages_to_sg(struct page **pages, | |
97 | int nr_pages, int offset) | |
7a7d9a89 MCC |
98 | { |
99 | struct scatterlist *sglist; | |
a47cacbd | 100 | int i; |
7a7d9a89 MCC |
101 | |
102 | if (NULL == pages[0]) | |
103 | return NULL; | |
1010ed13 | 104 | sglist = vmalloc(nr_pages * sizeof(*sglist)); |
7a7d9a89 MCC |
105 | if (NULL == sglist) |
106 | return NULL; | |
45711f1a | 107 | sg_init_table(sglist, nr_pages); |
7a7d9a89 | 108 | |
7a7d9a89 MCC |
109 | if (PageHighMem(pages[0])) |
110 | /* DMA to highmem pages might not work */ | |
111 | goto highmem; | |
642f1490 | 112 | sg_set_page(&sglist[0], pages[0], PAGE_SIZE - offset, 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; | |
642f1490 | 118 | sg_set_page(&sglist[i], pages[i], PAGE_SIZE, 0); |
7a7d9a89 MCC |
119 | } |
120 | return sglist; | |
121 | ||
7a02264c PO |
122 | nopage: |
123 | dprintk(2, "sgl: oops - no page\n"); | |
1010ed13 | 124 | vfree(sglist); |
7a7d9a89 MCC |
125 | return NULL; |
126 | ||
7a02264c PO |
127 | highmem: |
128 | dprintk(2, "sgl: oops - highmem page\n"); | |
1010ed13 | 129 | vfree(sglist); |
7a7d9a89 MCC |
130 | return NULL; |
131 | } | |
132 | ||
133 | /* --------------------------------------------------------------------- */ | |
134 | ||
7a02264c | 135 | struct videobuf_dmabuf *videobuf_to_dma(struct videobuf_buffer *buf) |
7a7d9a89 | 136 | { |
0705135e GL |
137 | struct videobuf_dma_sg_memory *mem = buf->priv; |
138 | BUG_ON(!mem); | |
7a7d9a89 | 139 | |
0705135e | 140 | MAGIC_CHECK(mem->magic, MAGIC_SG_MEM); |
7a7d9a89 MCC |
141 | |
142 | return &mem->dma; | |
143 | } | |
7a02264c | 144 | EXPORT_SYMBOL_GPL(videobuf_to_dma); |
7a7d9a89 MCC |
145 | |
146 | void videobuf_dma_init(struct videobuf_dmabuf *dma) | |
147 | { | |
7a02264c | 148 | memset(dma, 0, sizeof(*dma)); |
7a7d9a89 MCC |
149 | dma->magic = MAGIC_DMABUF; |
150 | } | |
7a02264c | 151 | EXPORT_SYMBOL_GPL(videobuf_dma_init); |
7a7d9a89 | 152 | |
9900132f ML |
153 | static int videobuf_dma_init_user_locked(struct videobuf_dmabuf *dma, |
154 | int direction, unsigned long data, unsigned long size) | |
7a7d9a89 | 155 | { |
7a02264c | 156 | unsigned long first, last; |
7a7d9a89 MCC |
157 | int err, rw = 0; |
158 | ||
159 | dma->direction = direction; | |
160 | switch (dma->direction) { | |
0705135e GL |
161 | case DMA_FROM_DEVICE: |
162 | rw = READ; | |
163 | break; | |
164 | case DMA_TO_DEVICE: | |
165 | rw = WRITE; | |
166 | break; | |
167 | default: | |
168 | BUG(); | |
7a7d9a89 MCC |
169 | } |
170 | ||
171 | first = (data & PAGE_MASK) >> PAGE_SHIFT; | |
172 | last = ((data+size-1) & PAGE_MASK) >> PAGE_SHIFT; | |
173 | dma->offset = data & ~PAGE_MASK; | |
174 | dma->nr_pages = last-first+1; | |
7a02264c | 175 | dma->pages = kmalloc(dma->nr_pages * sizeof(struct page *), GFP_KERNEL); |
7a7d9a89 MCC |
176 | if (NULL == dma->pages) |
177 | return -ENOMEM; | |
7a7d9a89 | 178 | |
7a02264c PO |
179 | dprintk(1, "init user [0x%lx+0x%lx => %d pages]\n", |
180 | data, size, dma->nr_pages); | |
181 | ||
182 | err = get_user_pages(current, current->mm, | |
7a7d9a89 MCC |
183 | data & PAGE_MASK, dma->nr_pages, |
184 | rw == READ, 1, /* force */ | |
185 | dma->pages, NULL); | |
9900132f | 186 | |
7a7d9a89 MCC |
187 | if (err != dma->nr_pages) { |
188 | dma->nr_pages = (err >= 0) ? err : 0; | |
7a02264c | 189 | dprintk(1, "get_user_pages: err=%d [%d]\n", err, dma->nr_pages); |
7a7d9a89 MCC |
190 | return err < 0 ? err : -EINVAL; |
191 | } | |
192 | return 0; | |
193 | } | |
194 | ||
9900132f ML |
195 | int videobuf_dma_init_user(struct videobuf_dmabuf *dma, int direction, |
196 | unsigned long data, unsigned long size) | |
197 | { | |
198 | int ret; | |
7a02264c | 199 | |
9900132f ML |
200 | down_read(¤t->mm->mmap_sem); |
201 | ret = videobuf_dma_init_user_locked(dma, direction, data, size); | |
202 | up_read(¤t->mm->mmap_sem); | |
203 | ||
204 | return ret; | |
205 | } | |
7a02264c | 206 | EXPORT_SYMBOL_GPL(videobuf_dma_init_user); |
9900132f | 207 | |
7a7d9a89 MCC |
208 | int videobuf_dma_init_kernel(struct videobuf_dmabuf *dma, int direction, |
209 | int nr_pages) | |
210 | { | |
7a02264c PO |
211 | dprintk(1, "init kernel [%d pages]\n", nr_pages); |
212 | ||
7a7d9a89 MCC |
213 | dma->direction = direction; |
214 | dma->vmalloc = vmalloc_32(nr_pages << PAGE_SHIFT); | |
215 | if (NULL == dma->vmalloc) { | |
7a02264c | 216 | dprintk(1, "vmalloc_32(%d pages) failed\n", nr_pages); |
7a7d9a89 MCC |
217 | return -ENOMEM; |
218 | } | |
7a02264c PO |
219 | |
220 | dprintk(1, "vmalloc is at addr 0x%08lx, size=%d\n", | |
7a7d9a89 MCC |
221 | (unsigned long)dma->vmalloc, |
222 | nr_pages << PAGE_SHIFT); | |
7a02264c PO |
223 | |
224 | memset(dma->vmalloc, 0, nr_pages << PAGE_SHIFT); | |
7a7d9a89 | 225 | dma->nr_pages = nr_pages; |
7a02264c | 226 | |
7a7d9a89 MCC |
227 | return 0; |
228 | } | |
7a02264c | 229 | EXPORT_SYMBOL_GPL(videobuf_dma_init_kernel); |
7a7d9a89 MCC |
230 | |
231 | int videobuf_dma_init_overlay(struct videobuf_dmabuf *dma, int direction, | |
232 | dma_addr_t addr, int nr_pages) | |
233 | { | |
7a02264c PO |
234 | dprintk(1, "init overlay [%d pages @ bus 0x%lx]\n", |
235 | nr_pages, (unsigned long)addr); | |
7a7d9a89 | 236 | dma->direction = direction; |
7a02264c | 237 | |
7a7d9a89 MCC |
238 | if (0 == addr) |
239 | return -EINVAL; | |
240 | ||
241 | dma->bus_addr = addr; | |
242 | dma->nr_pages = nr_pages; | |
7a02264c | 243 | |
7a7d9a89 MCC |
244 | return 0; |
245 | } | |
7a02264c | 246 | EXPORT_SYMBOL_GPL(videobuf_dma_init_overlay); |
7a7d9a89 | 247 | |
95268403 | 248 | int videobuf_dma_map(struct device *dev, struct videobuf_dmabuf *dma) |
7a7d9a89 | 249 | { |
7a02264c | 250 | MAGIC_CHECK(dma->magic, MAGIC_DMABUF); |
7a7d9a89 MCC |
251 | BUG_ON(0 == dma->nr_pages); |
252 | ||
253 | if (dma->pages) { | |
254 | dma->sglist = videobuf_pages_to_sg(dma->pages, dma->nr_pages, | |
255 | dma->offset); | |
256 | } | |
257 | if (dma->vmalloc) { | |
7a02264c PO |
258 | dma->sglist = videobuf_vmalloc_to_sg(dma->vmalloc, |
259 | dma->nr_pages); | |
7a7d9a89 MCC |
260 | } |
261 | if (dma->bus_addr) { | |
1010ed13 | 262 | dma->sglist = vmalloc(sizeof(*dma->sglist)); |
7a7d9a89 | 263 | if (NULL != dma->sglist) { |
7a02264c PO |
264 | dma->sglen = 1; |
265 | sg_dma_address(&dma->sglist[0]) = dma->bus_addr | |
266 | & PAGE_MASK; | |
267 | dma->sglist[0].offset = dma->bus_addr & ~PAGE_MASK; | |
268 | sg_dma_len(&dma->sglist[0]) = dma->nr_pages * PAGE_SIZE; | |
7a7d9a89 MCC |
269 | } |
270 | } | |
271 | if (NULL == dma->sglist) { | |
7a02264c | 272 | dprintk(1, "scatterlist is NULL\n"); |
7a7d9a89 MCC |
273 | return -ENOMEM; |
274 | } | |
275 | if (!dma->bus_addr) { | |
95268403 | 276 | dma->sglen = dma_map_sg(dev, dma->sglist, |
7a7d9a89 | 277 | dma->nr_pages, dma->direction); |
7a7d9a89 MCC |
278 | if (0 == dma->sglen) { |
279 | printk(KERN_WARNING | |
7a02264c | 280 | "%s: videobuf_map_sg failed\n", __func__); |
1010ed13 | 281 | vfree(dma->sglist); |
7a7d9a89 MCC |
282 | dma->sglist = NULL; |
283 | dma->sglen = 0; | |
92051b28 | 284 | return -ENOMEM; |
7a7d9a89 MCC |
285 | } |
286 | } | |
7a02264c | 287 | |
7a7d9a89 MCC |
288 | return 0; |
289 | } | |
7a02264c | 290 | EXPORT_SYMBOL_GPL(videobuf_dma_map); |
7a7d9a89 | 291 | |
95268403 | 292 | int videobuf_dma_unmap(struct device *dev, struct videobuf_dmabuf *dma) |
7a7d9a89 | 293 | { |
0705135e | 294 | MAGIC_CHECK(dma->magic, MAGIC_DMABUF); |
7a02264c | 295 | |
7a7d9a89 MCC |
296 | if (!dma->sglen) |
297 | return 0; | |
298 | ||
95268403 | 299 | dma_unmap_sg(dev, dma->sglist, dma->sglen, dma->direction); |
5ddff434 | 300 | |
1010ed13 | 301 | vfree(dma->sglist); |
7a7d9a89 MCC |
302 | dma->sglist = NULL; |
303 | dma->sglen = 0; | |
7a02264c | 304 | |
7a7d9a89 MCC |
305 | return 0; |
306 | } | |
7a02264c | 307 | EXPORT_SYMBOL_GPL(videobuf_dma_unmap); |
7a7d9a89 MCC |
308 | |
309 | int videobuf_dma_free(struct videobuf_dmabuf *dma) | |
310 | { | |
7a02264c PO |
311 | int i; |
312 | MAGIC_CHECK(dma->magic, MAGIC_DMABUF); | |
7a7d9a89 MCC |
313 | BUG_ON(dma->sglen); |
314 | ||
315 | if (dma->pages) { | |
7a02264c | 316 | for (i = 0; i < dma->nr_pages; i++) |
7a7d9a89 MCC |
317 | page_cache_release(dma->pages[i]); |
318 | kfree(dma->pages); | |
319 | dma->pages = NULL; | |
320 | } | |
321 | ||
322 | vfree(dma->vmalloc); | |
323 | dma->vmalloc = NULL; | |
7a7d9a89 | 324 | |
7a02264c | 325 | if (dma->bus_addr) |
7a7d9a89 | 326 | dma->bus_addr = 0; |
0705135e | 327 | dma->direction = DMA_NONE; |
7a02264c | 328 | |
7a7d9a89 MCC |
329 | return 0; |
330 | } | |
7a02264c | 331 | EXPORT_SYMBOL_GPL(videobuf_dma_free); |
7a7d9a89 MCC |
332 | |
333 | /* --------------------------------------------------------------------- */ | |
334 | ||
7a02264c | 335 | static void videobuf_vm_open(struct vm_area_struct *vma) |
7a7d9a89 MCC |
336 | { |
337 | struct videobuf_mapping *map = vma->vm_private_data; | |
338 | ||
7a02264c PO |
339 | dprintk(2, "vm_open %p [count=%d,vma=%08lx-%08lx]\n", map, |
340 | map->count, vma->vm_start, vma->vm_end); | |
341 | ||
7a7d9a89 MCC |
342 | map->count++; |
343 | } | |
344 | ||
7a02264c | 345 | static void videobuf_vm_close(struct vm_area_struct *vma) |
7a7d9a89 MCC |
346 | { |
347 | struct videobuf_mapping *map = vma->vm_private_data; | |
348 | struct videobuf_queue *q = map->q; | |
0705135e | 349 | struct videobuf_dma_sg_memory *mem; |
7a7d9a89 MCC |
350 | int i; |
351 | ||
7a02264c PO |
352 | dprintk(2, "vm_close %p [count=%d,vma=%08lx-%08lx]\n", map, |
353 | map->count, vma->vm_start, vma->vm_end); | |
7a7d9a89 MCC |
354 | |
355 | map->count--; | |
356 | if (0 == map->count) { | |
7a02264c | 357 | dprintk(1, "munmap %p q=%p\n", map, q); |
64f9477f | 358 | mutex_lock(&q->vb_lock); |
7a7d9a89 MCC |
359 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { |
360 | if (NULL == q->bufs[i]) | |
361 | continue; | |
7a02264c | 362 | mem = q->bufs[i]->priv; |
7a7d9a89 MCC |
363 | if (!mem) |
364 | continue; | |
365 | ||
7a02264c | 366 | MAGIC_CHECK(mem->magic, MAGIC_SG_MEM); |
7a7d9a89 | 367 | |
851c0c96 | 368 | if (q->bufs[i]->map != map) |
7a7d9a89 | 369 | continue; |
851c0c96 | 370 | q->bufs[i]->map = NULL; |
7a7d9a89 | 371 | q->bufs[i]->baddr = 0; |
7a02264c | 372 | q->ops->buf_release(q, q->bufs[i]); |
7a7d9a89 | 373 | } |
64f9477f | 374 | mutex_unlock(&q->vb_lock); |
7a7d9a89 MCC |
375 | kfree(map); |
376 | } | |
377 | return; | |
378 | } | |
379 | ||
380 | /* | |
381 | * Get a anonymous page for the mapping. Make sure we can DMA to that | |
382 | * memory location with 32bit PCI devices (i.e. don't use highmem for | |
383 | * now ...). Bounce buffers don't work very well for the data rates | |
384 | * video capture has. | |
385 | */ | |
7a02264c | 386 | static int videobuf_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
7a7d9a89 MCC |
387 | { |
388 | struct page *page; | |
389 | ||
7a02264c PO |
390 | dprintk(3, "fault: fault @ %08lx [vma %08lx-%08lx]\n", |
391 | (unsigned long)vmf->virtual_address, | |
392 | vma->vm_start, vma->vm_end); | |
393 | ||
7a7d9a89 MCC |
394 | page = alloc_page(GFP_USER | __GFP_DMA32); |
395 | if (!page) | |
105354a0 | 396 | return VM_FAULT_OOM; |
c0cd5010 | 397 | clear_user_highpage(page, (unsigned long)vmf->virtual_address); |
105354a0 | 398 | vmf->page = page; |
7a02264c | 399 | |
105354a0 | 400 | return 0; |
7a7d9a89 MCC |
401 | } |
402 | ||
7a02264c PO |
403 | static const struct vm_operations_struct videobuf_vm_ops = { |
404 | .open = videobuf_vm_open, | |
405 | .close = videobuf_vm_close, | |
406 | .fault = videobuf_vm_fault, | |
7a7d9a89 MCC |
407 | }; |
408 | ||
409 | /* --------------------------------------------------------------------- | |
0705135e | 410 | * SG handlers for the generic methods |
7a7d9a89 MCC |
411 | */ |
412 | ||
413 | /* Allocated area consists on 3 parts: | |
414 | struct video_buffer | |
415 | struct <driver>_buffer (cx88_buffer, saa7134_buf, ...) | |
0705135e | 416 | struct videobuf_dma_sg_memory |
7a7d9a89 MCC |
417 | */ |
418 | ||
33c38283 | 419 | static struct videobuf_buffer *__videobuf_alloc_vb(size_t size) |
7a7d9a89 | 420 | { |
0705135e | 421 | struct videobuf_dma_sg_memory *mem; |
7a7d9a89 MCC |
422 | struct videobuf_buffer *vb; |
423 | ||
7a02264c | 424 | vb = kzalloc(size + sizeof(*mem), GFP_KERNEL); |
bee527f9 PO |
425 | if (!vb) |
426 | return vb; | |
7a7d9a89 | 427 | |
7a02264c PO |
428 | mem = vb->priv = ((char *)vb) + size; |
429 | mem->magic = MAGIC_SG_MEM; | |
7a7d9a89 MCC |
430 | |
431 | videobuf_dma_init(&mem->dma); | |
432 | ||
7a02264c PO |
433 | dprintk(1, "%s: allocated at %p(%ld+%ld) & %p(%ld)\n", |
434 | __func__, vb, (long)sizeof(*vb), (long)size - sizeof(*vb), | |
435 | mem, (long)sizeof(*mem)); | |
7a7d9a89 MCC |
436 | |
437 | return vb; | |
438 | } | |
439 | ||
037c75eb | 440 | static void *__videobuf_to_vaddr(struct videobuf_buffer *buf) |
59d34489 MCC |
441 | { |
442 | struct videobuf_dma_sg_memory *mem = buf->priv; | |
443 | BUG_ON(!mem); | |
444 | ||
445 | MAGIC_CHECK(mem->magic, MAGIC_SG_MEM); | |
446 | ||
447 | return mem->dma.vmalloc; | |
448 | } | |
449 | ||
7a02264c PO |
450 | static int __videobuf_iolock(struct videobuf_queue *q, |
451 | struct videobuf_buffer *vb, | |
452 | struct v4l2_framebuffer *fbuf) | |
7a7d9a89 | 453 | { |
7a02264c | 454 | int err, pages; |
7a7d9a89 | 455 | dma_addr_t bus; |
0705135e | 456 | struct videobuf_dma_sg_memory *mem = vb->priv; |
7a7d9a89 MCC |
457 | BUG_ON(!mem); |
458 | ||
0705135e | 459 | MAGIC_CHECK(mem->magic, MAGIC_SG_MEM); |
7a7d9a89 MCC |
460 | |
461 | switch (vb->memory) { | |
462 | case V4L2_MEMORY_MMAP: | |
463 | case V4L2_MEMORY_USERPTR: | |
464 | if (0 == vb->baddr) { | |
465 | /* no userspace addr -- kernel bounce buffer */ | |
466 | pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT; | |
7a02264c PO |
467 | err = videobuf_dma_init_kernel(&mem->dma, |
468 | DMA_FROM_DEVICE, | |
469 | pages); | |
7a7d9a89 MCC |
470 | if (0 != err) |
471 | return err; | |
9900132f | 472 | } else if (vb->memory == V4L2_MEMORY_USERPTR) { |
7a7d9a89 | 473 | /* dma directly to userspace */ |
7a02264c PO |
474 | err = videobuf_dma_init_user(&mem->dma, |
475 | DMA_FROM_DEVICE, | |
476 | vb->baddr, vb->bsize); | |
7a7d9a89 MCC |
477 | if (0 != err) |
478 | return err; | |
9900132f ML |
479 | } else { |
480 | /* NOTE: HACK: videobuf_iolock on V4L2_MEMORY_MMAP | |
481 | buffers can only be called from videobuf_qbuf | |
482 | we take current->mm->mmap_sem there, to prevent | |
483 | locking inversion, so don't take it here */ | |
484 | ||
485 | err = videobuf_dma_init_user_locked(&mem->dma, | |
0705135e | 486 | DMA_FROM_DEVICE, |
9900132f ML |
487 | vb->baddr, vb->bsize); |
488 | if (0 != err) | |
489 | return err; | |
7a7d9a89 MCC |
490 | } |
491 | break; | |
492 | case V4L2_MEMORY_OVERLAY: | |
493 | if (NULL == fbuf) | |
494 | return -EINVAL; | |
495 | /* FIXME: need sanity checks for vb->boff */ | |
496 | /* | |
497 | * Using a double cast to avoid compiler warnings when | |
498 | * building for PAE. Compiler doesn't like direct casting | |
499 | * of a 32 bit ptr to 64 bit integer. | |
500 | */ | |
501 | bus = (dma_addr_t)(unsigned long)fbuf->base + vb->boff; | |
502 | pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT; | |
0705135e | 503 | err = videobuf_dma_init_overlay(&mem->dma, DMA_FROM_DEVICE, |
7a7d9a89 MCC |
504 | bus, pages); |
505 | if (0 != err) | |
506 | return err; | |
507 | break; | |
508 | default: | |
509 | BUG(); | |
510 | } | |
95268403 | 511 | err = videobuf_dma_map(q->dev, &mem->dma); |
7a7d9a89 MCC |
512 | if (0 != err) |
513 | return err; | |
514 | ||
515 | return 0; | |
516 | } | |
517 | ||
518 | static int __videobuf_sync(struct videobuf_queue *q, | |
519 | struct videobuf_buffer *buf) | |
520 | { | |
0705135e | 521 | struct videobuf_dma_sg_memory *mem = buf->priv; |
97f8105d MCC |
522 | BUG_ON(!mem || !mem->dma.sglen); |
523 | ||
7a02264c | 524 | MAGIC_CHECK(mem->magic, MAGIC_SG_MEM); |
97f8105d | 525 | MAGIC_CHECK(mem->dma.magic, MAGIC_DMABUF); |
7a7d9a89 | 526 | |
97f8105d | 527 | dma_sync_sg_for_cpu(q->dev, mem->dma.sglist, |
fc7f8fd4 | 528 | mem->dma.sglen, mem->dma.direction); |
97f8105d MCC |
529 | |
530 | return 0; | |
7a7d9a89 MCC |
531 | } |
532 | ||
7a7d9a89 | 533 | static int __videobuf_mmap_mapper(struct videobuf_queue *q, |
0b62b737 HV |
534 | struct videobuf_buffer *buf, |
535 | struct vm_area_struct *vma) | |
7a7d9a89 | 536 | { |
0b62b737 | 537 | struct videobuf_dma_sg_memory *mem = buf->priv; |
7a7d9a89 | 538 | struct videobuf_mapping *map; |
474675ad | 539 | unsigned int first, last, size = 0, i; |
7a7d9a89 MCC |
540 | int retval; |
541 | ||
542 | retval = -EINVAL; | |
7a7d9a89 | 543 | |
ce54093c BP |
544 | /* This function maintains backwards compatibility with V4L1 and will |
545 | * map more than one buffer if the vma length is equal to the combined | |
546 | * size of multiple buffers than it will map them together. See | |
547 | * VIDIOCGMBUF in the v4l spec | |
548 | * | |
549 | * TODO: Allow drivers to specify if they support this mode | |
550 | */ | |
551 | ||
0b62b737 HV |
552 | BUG_ON(!mem); |
553 | MAGIC_CHECK(mem->magic, MAGIC_SG_MEM); | |
554 | ||
7a7d9a89 MCC |
555 | /* look for first buffer to map */ |
556 | for (first = 0; first < VIDEO_MAX_FRAME; first++) { | |
0b62b737 HV |
557 | if (buf == q->bufs[first]) { |
558 | size = PAGE_ALIGN(q->bufs[first]->bsize); | |
7a7d9a89 | 559 | break; |
0b62b737 | 560 | } |
7a7d9a89 | 561 | } |
0b62b737 HV |
562 | |
563 | /* paranoia, should never happen since buf is always valid. */ | |
474675ad | 564 | if (!size) { |
7a02264c | 565 | dprintk(1, "mmap app bug: offset invalid [offset=0x%lx]\n", |
0b62b737 | 566 | (vma->vm_pgoff << PAGE_SHIFT)); |
7a7d9a89 MCC |
567 | goto done; |
568 | } | |
569 | ||
0b62b737 HV |
570 | last = first; |
571 | #ifdef CONFIG_VIDEO_V4L1_COMPAT | |
572 | if (size != (vma->vm_end - vma->vm_start)) { | |
573 | /* look for last buffer to map */ | |
574 | for (last = first + 1; last < VIDEO_MAX_FRAME; last++) { | |
575 | if (NULL == q->bufs[last]) | |
576 | continue; | |
577 | if (V4L2_MEMORY_MMAP != q->bufs[last]->memory) | |
578 | continue; | |
579 | if (q->bufs[last]->map) { | |
580 | retval = -EBUSY; | |
581 | goto done; | |
582 | } | |
583 | size += PAGE_ALIGN(q->bufs[last]->bsize); | |
584 | if (size == (vma->vm_end - vma->vm_start)) | |
585 | break; | |
586 | } | |
587 | if (VIDEO_MAX_FRAME == last) { | |
588 | dprintk(1, "mmap app bug: size invalid [size=0x%lx]\n", | |
589 | (vma->vm_end - vma->vm_start)); | |
7a7d9a89 MCC |
590 | goto done; |
591 | } | |
7a7d9a89 | 592 | } |
0b62b737 | 593 | #endif |
7a7d9a89 MCC |
594 | |
595 | /* create mapping + update buffer list */ | |
596 | retval = -ENOMEM; | |
7a02264c | 597 | map = kmalloc(sizeof(struct videobuf_mapping), GFP_KERNEL); |
7a7d9a89 MCC |
598 | if (NULL == map) |
599 | goto done; | |
ce54093c BP |
600 | |
601 | size = 0; | |
602 | for (i = first; i <= last; i++) { | |
603 | if (NULL == q->bufs[i]) | |
604 | continue; | |
851c0c96 | 605 | q->bufs[i]->map = map; |
7a7d9a89 | 606 | q->bufs[i]->baddr = vma->vm_start + size; |
7cbefad0 | 607 | size += PAGE_ALIGN(q->bufs[i]->bsize); |
7a7d9a89 | 608 | } |
ce54093c | 609 | |
7a7d9a89 | 610 | map->count = 1; |
7a7d9a89 MCC |
611 | map->q = q; |
612 | vma->vm_ops = &videobuf_vm_ops; | |
613 | vma->vm_flags |= VM_DONTEXPAND | VM_RESERVED; | |
614 | vma->vm_flags &= ~VM_IO; /* using shared anonymous pages */ | |
615 | vma->vm_private_data = map; | |
7a02264c PO |
616 | dprintk(1, "mmap %p: q=%p %08lx-%08lx pgoff %08lx bufs %d-%d\n", |
617 | map, q, vma->vm_start, vma->vm_end, vma->vm_pgoff, first, last); | |
7a7d9a89 MCC |
618 | retval = 0; |
619 | ||
7a02264c | 620 | done: |
7a7d9a89 MCC |
621 | return retval; |
622 | } | |
623 | ||
0705135e | 624 | static struct videobuf_qtype_ops sg_ops = { |
7a7d9a89 MCC |
625 | .magic = MAGIC_QTYPE_OPS, |
626 | ||
33c38283 | 627 | .alloc_vb = __videobuf_alloc_vb, |
7a7d9a89 MCC |
628 | .iolock = __videobuf_iolock, |
629 | .sync = __videobuf_sync, | |
7a7d9a89 | 630 | .mmap_mapper = __videobuf_mmap_mapper, |
037c75eb | 631 | .vaddr = __videobuf_to_vaddr, |
7a7d9a89 MCC |
632 | }; |
633 | ||
0705135e | 634 | void *videobuf_sg_alloc(size_t size) |
7a7d9a89 MCC |
635 | { |
636 | struct videobuf_queue q; | |
637 | ||
638 | /* Required to make generic handler to call __videobuf_alloc */ | |
0705135e | 639 | q.int_ops = &sg_ops; |
7a7d9a89 | 640 | |
0705135e | 641 | q.msize = size; |
7a7d9a89 | 642 | |
33c38283 | 643 | return videobuf_alloc_vb(&q); |
7a7d9a89 | 644 | } |
7a02264c | 645 | EXPORT_SYMBOL_GPL(videobuf_sg_alloc); |
7a7d9a89 | 646 | |
7a02264c | 647 | void videobuf_queue_sg_init(struct videobuf_queue *q, |
38a54f35 | 648 | const struct videobuf_queue_ops *ops, |
0705135e | 649 | struct device *dev, |
7a7d9a89 MCC |
650 | spinlock_t *irqlock, |
651 | enum v4l2_buf_type type, | |
652 | enum v4l2_field field, | |
653 | unsigned int msize, | |
654 | void *priv) | |
655 | { | |
d4cae5a5 | 656 | videobuf_queue_core_init(q, ops, dev, irqlock, type, field, msize, |
0705135e | 657 | priv, &sg_ops); |
7a7d9a89 | 658 | } |
0705135e | 659 | EXPORT_SYMBOL_GPL(videobuf_queue_sg_init); |
7a7d9a89 | 660 |