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; | |
45f239ab NE |
111 | sg_set_page(&sglist[0], pages[0], |
112 | min_t(size_t, PAGE_SIZE - offset, size), offset); | |
113 | size -= min_t(size_t, PAGE_SIZE - offset, size); | |
7a7d9a89 MCC |
114 | for (i = 1; i < nr_pages; i++) { |
115 | if (NULL == pages[i]) | |
116 | goto nopage; | |
117 | if (PageHighMem(pages[i])) | |
118 | goto highmem; | |
1bede752 MCC |
119 | sg_set_page(&sglist[i], pages[i], min_t(size_t, PAGE_SIZE, size), 0); |
120 | size -= min_t(size_t, PAGE_SIZE, size); | |
7a7d9a89 MCC |
121 | } |
122 | return sglist; | |
123 | ||
7a02264c PO |
124 | nopage: |
125 | dprintk(2, "sgl: oops - no page\n"); | |
1010ed13 | 126 | vfree(sglist); |
7a7d9a89 MCC |
127 | return NULL; |
128 | ||
7a02264c PO |
129 | highmem: |
130 | dprintk(2, "sgl: oops - highmem page\n"); | |
1010ed13 | 131 | vfree(sglist); |
7a7d9a89 MCC |
132 | return NULL; |
133 | } | |
134 | ||
135 | /* --------------------------------------------------------------------- */ | |
136 | ||
7a02264c | 137 | struct videobuf_dmabuf *videobuf_to_dma(struct videobuf_buffer *buf) |
7a7d9a89 | 138 | { |
0705135e GL |
139 | struct videobuf_dma_sg_memory *mem = buf->priv; |
140 | BUG_ON(!mem); | |
7a7d9a89 | 141 | |
0705135e | 142 | MAGIC_CHECK(mem->magic, MAGIC_SG_MEM); |
7a7d9a89 MCC |
143 | |
144 | return &mem->dma; | |
145 | } | |
7a02264c | 146 | EXPORT_SYMBOL_GPL(videobuf_to_dma); |
7a7d9a89 MCC |
147 | |
148 | void videobuf_dma_init(struct videobuf_dmabuf *dma) | |
149 | { | |
7a02264c | 150 | memset(dma, 0, sizeof(*dma)); |
7a7d9a89 MCC |
151 | dma->magic = MAGIC_DMABUF; |
152 | } | |
7a02264c | 153 | EXPORT_SYMBOL_GPL(videobuf_dma_init); |
7a7d9a89 | 154 | |
9900132f ML |
155 | static int videobuf_dma_init_user_locked(struct videobuf_dmabuf *dma, |
156 | int direction, unsigned long data, unsigned long size) | |
7a7d9a89 | 157 | { |
7a02264c | 158 | unsigned long first, last; |
7a7d9a89 MCC |
159 | int err, rw = 0; |
160 | ||
161 | dma->direction = direction; | |
162 | switch (dma->direction) { | |
0705135e GL |
163 | case DMA_FROM_DEVICE: |
164 | rw = READ; | |
165 | break; | |
166 | case DMA_TO_DEVICE: | |
167 | rw = WRITE; | |
168 | break; | |
169 | default: | |
170 | BUG(); | |
7a7d9a89 MCC |
171 | } |
172 | ||
173 | first = (data & PAGE_MASK) >> PAGE_SHIFT; | |
174 | last = ((data+size-1) & PAGE_MASK) >> PAGE_SHIFT; | |
2fc11536 HV |
175 | dma->offset = data & ~PAGE_MASK; |
176 | dma->size = size; | |
7a7d9a89 | 177 | dma->nr_pages = last-first+1; |
7a02264c | 178 | dma->pages = kmalloc(dma->nr_pages * sizeof(struct page *), GFP_KERNEL); |
7a7d9a89 MCC |
179 | if (NULL == dma->pages) |
180 | return -ENOMEM; | |
7a7d9a89 | 181 | |
7a02264c PO |
182 | dprintk(1, "init user [0x%lx+0x%lx => %d pages]\n", |
183 | data, size, dma->nr_pages); | |
184 | ||
185 | err = get_user_pages(current, current->mm, | |
7a7d9a89 MCC |
186 | data & PAGE_MASK, dma->nr_pages, |
187 | rw == READ, 1, /* force */ | |
188 | dma->pages, NULL); | |
9900132f | 189 | |
7a7d9a89 MCC |
190 | if (err != dma->nr_pages) { |
191 | dma->nr_pages = (err >= 0) ? err : 0; | |
7a02264c | 192 | dprintk(1, "get_user_pages: err=%d [%d]\n", err, dma->nr_pages); |
7a7d9a89 MCC |
193 | return err < 0 ? err : -EINVAL; |
194 | } | |
195 | return 0; | |
196 | } | |
197 | ||
9900132f ML |
198 | int videobuf_dma_init_user(struct videobuf_dmabuf *dma, int direction, |
199 | unsigned long data, unsigned long size) | |
200 | { | |
201 | int ret; | |
7a02264c | 202 | |
9900132f ML |
203 | down_read(¤t->mm->mmap_sem); |
204 | ret = videobuf_dma_init_user_locked(dma, direction, data, size); | |
205 | up_read(¤t->mm->mmap_sem); | |
206 | ||
207 | return ret; | |
208 | } | |
7a02264c | 209 | EXPORT_SYMBOL_GPL(videobuf_dma_init_user); |
9900132f | 210 | |
7a7d9a89 MCC |
211 | int videobuf_dma_init_kernel(struct videobuf_dmabuf *dma, int direction, |
212 | int nr_pages) | |
213 | { | |
7a02264c PO |
214 | dprintk(1, "init kernel [%d pages]\n", nr_pages); |
215 | ||
7a7d9a89 | 216 | dma->direction = direction; |
bb6dbe74 LP |
217 | dma->vaddr = vmalloc_32(nr_pages << PAGE_SHIFT); |
218 | if (NULL == dma->vaddr) { | |
7a02264c | 219 | dprintk(1, "vmalloc_32(%d pages) failed\n", nr_pages); |
7a7d9a89 MCC |
220 | return -ENOMEM; |
221 | } | |
7a02264c PO |
222 | |
223 | dprintk(1, "vmalloc is at addr 0x%08lx, size=%d\n", | |
bb6dbe74 | 224 | (unsigned long)dma->vaddr, |
7a7d9a89 | 225 | nr_pages << PAGE_SHIFT); |
7a02264c | 226 | |
bb6dbe74 | 227 | memset(dma->vaddr, 0, nr_pages << PAGE_SHIFT); |
7a7d9a89 | 228 | dma->nr_pages = nr_pages; |
7a02264c | 229 | |
7a7d9a89 MCC |
230 | return 0; |
231 | } | |
7a02264c | 232 | EXPORT_SYMBOL_GPL(videobuf_dma_init_kernel); |
7a7d9a89 MCC |
233 | |
234 | int videobuf_dma_init_overlay(struct videobuf_dmabuf *dma, int direction, | |
235 | dma_addr_t addr, int nr_pages) | |
236 | { | |
7a02264c PO |
237 | dprintk(1, "init overlay [%d pages @ bus 0x%lx]\n", |
238 | nr_pages, (unsigned long)addr); | |
7a7d9a89 | 239 | dma->direction = direction; |
7a02264c | 240 | |
7a7d9a89 MCC |
241 | if (0 == addr) |
242 | return -EINVAL; | |
243 | ||
244 | dma->bus_addr = addr; | |
245 | dma->nr_pages = nr_pages; | |
7a02264c | 246 | |
7a7d9a89 MCC |
247 | return 0; |
248 | } | |
7a02264c | 249 | EXPORT_SYMBOL_GPL(videobuf_dma_init_overlay); |
7a7d9a89 | 250 | |
95268403 | 251 | int videobuf_dma_map(struct device *dev, struct videobuf_dmabuf *dma) |
7a7d9a89 | 252 | { |
7a02264c | 253 | MAGIC_CHECK(dma->magic, MAGIC_DMABUF); |
7a7d9a89 MCC |
254 | BUG_ON(0 == dma->nr_pages); |
255 | ||
256 | if (dma->pages) { | |
257 | dma->sglist = videobuf_pages_to_sg(dma->pages, dma->nr_pages, | |
2fc11536 | 258 | dma->offset, dma->size); |
7a7d9a89 | 259 | } |
bb6dbe74 LP |
260 | if (dma->vaddr) { |
261 | dma->sglist = videobuf_vmalloc_to_sg(dma->vaddr, | |
7a02264c | 262 | dma->nr_pages); |
7a7d9a89 MCC |
263 | } |
264 | if (dma->bus_addr) { | |
1010ed13 | 265 | dma->sglist = vmalloc(sizeof(*dma->sglist)); |
7a7d9a89 | 266 | if (NULL != dma->sglist) { |
7a02264c PO |
267 | dma->sglen = 1; |
268 | sg_dma_address(&dma->sglist[0]) = dma->bus_addr | |
269 | & PAGE_MASK; | |
270 | dma->sglist[0].offset = dma->bus_addr & ~PAGE_MASK; | |
271 | sg_dma_len(&dma->sglist[0]) = dma->nr_pages * PAGE_SIZE; | |
7a7d9a89 MCC |
272 | } |
273 | } | |
274 | if (NULL == dma->sglist) { | |
7a02264c | 275 | dprintk(1, "scatterlist is NULL\n"); |
7a7d9a89 MCC |
276 | return -ENOMEM; |
277 | } | |
278 | if (!dma->bus_addr) { | |
95268403 | 279 | dma->sglen = dma_map_sg(dev, dma->sglist, |
7a7d9a89 | 280 | dma->nr_pages, dma->direction); |
7a7d9a89 MCC |
281 | if (0 == dma->sglen) { |
282 | printk(KERN_WARNING | |
7a02264c | 283 | "%s: videobuf_map_sg failed\n", __func__); |
1010ed13 | 284 | vfree(dma->sglist); |
7a7d9a89 MCC |
285 | dma->sglist = NULL; |
286 | dma->sglen = 0; | |
92051b28 | 287 | return -ENOMEM; |
7a7d9a89 MCC |
288 | } |
289 | } | |
7a02264c | 290 | |
7a7d9a89 MCC |
291 | return 0; |
292 | } | |
7a02264c | 293 | EXPORT_SYMBOL_GPL(videobuf_dma_map); |
7a7d9a89 | 294 | |
95268403 | 295 | int videobuf_dma_unmap(struct device *dev, struct videobuf_dmabuf *dma) |
7a7d9a89 | 296 | { |
0705135e | 297 | MAGIC_CHECK(dma->magic, MAGIC_DMABUF); |
7a02264c | 298 | |
7a7d9a89 MCC |
299 | if (!dma->sglen) |
300 | return 0; | |
301 | ||
95268403 | 302 | dma_unmap_sg(dev, dma->sglist, dma->sglen, dma->direction); |
5ddff434 | 303 | |
1010ed13 | 304 | vfree(dma->sglist); |
7a7d9a89 MCC |
305 | dma->sglist = NULL; |
306 | dma->sglen = 0; | |
7a02264c | 307 | |
7a7d9a89 MCC |
308 | return 0; |
309 | } | |
7a02264c | 310 | EXPORT_SYMBOL_GPL(videobuf_dma_unmap); |
7a7d9a89 MCC |
311 | |
312 | int videobuf_dma_free(struct videobuf_dmabuf *dma) | |
313 | { | |
7a02264c PO |
314 | int i; |
315 | MAGIC_CHECK(dma->magic, MAGIC_DMABUF); | |
7a7d9a89 MCC |
316 | BUG_ON(dma->sglen); |
317 | ||
318 | if (dma->pages) { | |
7a02264c | 319 | for (i = 0; i < dma->nr_pages; i++) |
7a7d9a89 MCC |
320 | page_cache_release(dma->pages[i]); |
321 | kfree(dma->pages); | |
322 | dma->pages = NULL; | |
323 | } | |
324 | ||
bb6dbe74 LP |
325 | vfree(dma->vaddr); |
326 | dma->vaddr = NULL; | |
7a7d9a89 | 327 | |
7a02264c | 328 | if (dma->bus_addr) |
7a7d9a89 | 329 | dma->bus_addr = 0; |
0705135e | 330 | dma->direction = DMA_NONE; |
7a02264c | 331 | |
7a7d9a89 MCC |
332 | return 0; |
333 | } | |
7a02264c | 334 | EXPORT_SYMBOL_GPL(videobuf_dma_free); |
7a7d9a89 MCC |
335 | |
336 | /* --------------------------------------------------------------------- */ | |
337 | ||
7a02264c | 338 | static void videobuf_vm_open(struct vm_area_struct *vma) |
7a7d9a89 MCC |
339 | { |
340 | struct videobuf_mapping *map = vma->vm_private_data; | |
341 | ||
7a02264c PO |
342 | dprintk(2, "vm_open %p [count=%d,vma=%08lx-%08lx]\n", map, |
343 | map->count, vma->vm_start, vma->vm_end); | |
344 | ||
7a7d9a89 MCC |
345 | map->count++; |
346 | } | |
347 | ||
7a02264c | 348 | static void videobuf_vm_close(struct vm_area_struct *vma) |
7a7d9a89 MCC |
349 | { |
350 | struct videobuf_mapping *map = vma->vm_private_data; | |
351 | struct videobuf_queue *q = map->q; | |
0705135e | 352 | struct videobuf_dma_sg_memory *mem; |
7a7d9a89 MCC |
353 | int i; |
354 | ||
7a02264c PO |
355 | dprintk(2, "vm_close %p [count=%d,vma=%08lx-%08lx]\n", map, |
356 | map->count, vma->vm_start, vma->vm_end); | |
7a7d9a89 MCC |
357 | |
358 | map->count--; | |
359 | if (0 == map->count) { | |
7a02264c | 360 | dprintk(1, "munmap %p q=%p\n", map, q); |
97397687 | 361 | videobuf_queue_lock(q); |
7a7d9a89 MCC |
362 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { |
363 | if (NULL == q->bufs[i]) | |
364 | continue; | |
7a02264c | 365 | mem = q->bufs[i]->priv; |
7a7d9a89 MCC |
366 | if (!mem) |
367 | continue; | |
368 | ||
7a02264c | 369 | MAGIC_CHECK(mem->magic, MAGIC_SG_MEM); |
7a7d9a89 | 370 | |
851c0c96 | 371 | if (q->bufs[i]->map != map) |
7a7d9a89 | 372 | continue; |
851c0c96 | 373 | q->bufs[i]->map = NULL; |
7a7d9a89 | 374 | q->bufs[i]->baddr = 0; |
7a02264c | 375 | q->ops->buf_release(q, q->bufs[i]); |
7a7d9a89 | 376 | } |
97397687 | 377 | videobuf_queue_unlock(q); |
7a7d9a89 MCC |
378 | kfree(map); |
379 | } | |
380 | return; | |
381 | } | |
382 | ||
383 | /* | |
384 | * Get a anonymous page for the mapping. Make sure we can DMA to that | |
385 | * memory location with 32bit PCI devices (i.e. don't use highmem for | |
386 | * now ...). Bounce buffers don't work very well for the data rates | |
387 | * video capture has. | |
388 | */ | |
7a02264c | 389 | static int videobuf_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
7a7d9a89 MCC |
390 | { |
391 | struct page *page; | |
392 | ||
7a02264c PO |
393 | dprintk(3, "fault: fault @ %08lx [vma %08lx-%08lx]\n", |
394 | (unsigned long)vmf->virtual_address, | |
395 | vma->vm_start, vma->vm_end); | |
396 | ||
7a7d9a89 MCC |
397 | page = alloc_page(GFP_USER | __GFP_DMA32); |
398 | if (!page) | |
105354a0 | 399 | return VM_FAULT_OOM; |
c0cd5010 | 400 | clear_user_highpage(page, (unsigned long)vmf->virtual_address); |
105354a0 | 401 | vmf->page = page; |
7a02264c | 402 | |
105354a0 | 403 | return 0; |
7a7d9a89 MCC |
404 | } |
405 | ||
7a02264c PO |
406 | static const struct vm_operations_struct videobuf_vm_ops = { |
407 | .open = videobuf_vm_open, | |
408 | .close = videobuf_vm_close, | |
409 | .fault = videobuf_vm_fault, | |
7a7d9a89 MCC |
410 | }; |
411 | ||
412 | /* --------------------------------------------------------------------- | |
0705135e | 413 | * SG handlers for the generic methods |
7a7d9a89 MCC |
414 | */ |
415 | ||
416 | /* Allocated area consists on 3 parts: | |
417 | struct video_buffer | |
418 | struct <driver>_buffer (cx88_buffer, saa7134_buf, ...) | |
0705135e | 419 | struct videobuf_dma_sg_memory |
7a7d9a89 MCC |
420 | */ |
421 | ||
33c38283 | 422 | static struct videobuf_buffer *__videobuf_alloc_vb(size_t size) |
7a7d9a89 | 423 | { |
0705135e | 424 | struct videobuf_dma_sg_memory *mem; |
7a7d9a89 MCC |
425 | struct videobuf_buffer *vb; |
426 | ||
7a02264c | 427 | vb = kzalloc(size + sizeof(*mem), GFP_KERNEL); |
bee527f9 PO |
428 | if (!vb) |
429 | return vb; | |
7a7d9a89 | 430 | |
7a02264c PO |
431 | mem = vb->priv = ((char *)vb) + size; |
432 | mem->magic = MAGIC_SG_MEM; | |
7a7d9a89 MCC |
433 | |
434 | videobuf_dma_init(&mem->dma); | |
435 | ||
7a02264c PO |
436 | dprintk(1, "%s: allocated at %p(%ld+%ld) & %p(%ld)\n", |
437 | __func__, vb, (long)sizeof(*vb), (long)size - sizeof(*vb), | |
438 | mem, (long)sizeof(*mem)); | |
7a7d9a89 MCC |
439 | |
440 | return vb; | |
441 | } | |
442 | ||
037c75eb | 443 | static void *__videobuf_to_vaddr(struct videobuf_buffer *buf) |
59d34489 MCC |
444 | { |
445 | struct videobuf_dma_sg_memory *mem = buf->priv; | |
446 | BUG_ON(!mem); | |
447 | ||
448 | MAGIC_CHECK(mem->magic, MAGIC_SG_MEM); | |
449 | ||
bb6dbe74 | 450 | return mem->dma.vaddr; |
59d34489 MCC |
451 | } |
452 | ||
7a02264c PO |
453 | static int __videobuf_iolock(struct videobuf_queue *q, |
454 | struct videobuf_buffer *vb, | |
455 | struct v4l2_framebuffer *fbuf) | |
7a7d9a89 | 456 | { |
7a02264c | 457 | int err, pages; |
7a7d9a89 | 458 | dma_addr_t bus; |
0705135e | 459 | struct videobuf_dma_sg_memory *mem = vb->priv; |
7a7d9a89 MCC |
460 | BUG_ON(!mem); |
461 | ||
0705135e | 462 | MAGIC_CHECK(mem->magic, MAGIC_SG_MEM); |
7a7d9a89 MCC |
463 | |
464 | switch (vb->memory) { | |
465 | case V4L2_MEMORY_MMAP: | |
466 | case V4L2_MEMORY_USERPTR: | |
467 | if (0 == vb->baddr) { | |
468 | /* no userspace addr -- kernel bounce buffer */ | |
469 | pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT; | |
7a02264c PO |
470 | err = videobuf_dma_init_kernel(&mem->dma, |
471 | DMA_FROM_DEVICE, | |
472 | pages); | |
7a7d9a89 MCC |
473 | if (0 != err) |
474 | return err; | |
9900132f | 475 | } else if (vb->memory == V4L2_MEMORY_USERPTR) { |
7a7d9a89 | 476 | /* dma directly to userspace */ |
7a02264c PO |
477 | err = videobuf_dma_init_user(&mem->dma, |
478 | DMA_FROM_DEVICE, | |
479 | vb->baddr, vb->bsize); | |
7a7d9a89 MCC |
480 | if (0 != err) |
481 | return err; | |
9900132f ML |
482 | } else { |
483 | /* NOTE: HACK: videobuf_iolock on V4L2_MEMORY_MMAP | |
484 | buffers can only be called from videobuf_qbuf | |
485 | we take current->mm->mmap_sem there, to prevent | |
486 | locking inversion, so don't take it here */ | |
487 | ||
488 | err = videobuf_dma_init_user_locked(&mem->dma, | |
0705135e | 489 | DMA_FROM_DEVICE, |
9900132f ML |
490 | vb->baddr, vb->bsize); |
491 | if (0 != err) | |
492 | return err; | |
7a7d9a89 MCC |
493 | } |
494 | break; | |
495 | case V4L2_MEMORY_OVERLAY: | |
496 | if (NULL == fbuf) | |
497 | return -EINVAL; | |
498 | /* FIXME: need sanity checks for vb->boff */ | |
499 | /* | |
500 | * Using a double cast to avoid compiler warnings when | |
501 | * building for PAE. Compiler doesn't like direct casting | |
502 | * of a 32 bit ptr to 64 bit integer. | |
503 | */ | |
504 | bus = (dma_addr_t)(unsigned long)fbuf->base + vb->boff; | |
505 | pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT; | |
0705135e | 506 | err = videobuf_dma_init_overlay(&mem->dma, DMA_FROM_DEVICE, |
7a7d9a89 MCC |
507 | bus, pages); |
508 | if (0 != err) | |
509 | return err; | |
510 | break; | |
511 | default: | |
512 | BUG(); | |
513 | } | |
95268403 | 514 | err = videobuf_dma_map(q->dev, &mem->dma); |
7a7d9a89 MCC |
515 | if (0 != err) |
516 | return err; | |
517 | ||
518 | return 0; | |
519 | } | |
520 | ||
521 | static int __videobuf_sync(struct videobuf_queue *q, | |
522 | struct videobuf_buffer *buf) | |
523 | { | |
0705135e | 524 | struct videobuf_dma_sg_memory *mem = buf->priv; |
97f8105d MCC |
525 | BUG_ON(!mem || !mem->dma.sglen); |
526 | ||
7a02264c | 527 | MAGIC_CHECK(mem->magic, MAGIC_SG_MEM); |
97f8105d | 528 | MAGIC_CHECK(mem->dma.magic, MAGIC_DMABUF); |
7a7d9a89 | 529 | |
97f8105d | 530 | dma_sync_sg_for_cpu(q->dev, mem->dma.sglist, |
fc7f8fd4 | 531 | mem->dma.sglen, mem->dma.direction); |
97f8105d MCC |
532 | |
533 | return 0; | |
7a7d9a89 MCC |
534 | } |
535 | ||
7a7d9a89 | 536 | static int __videobuf_mmap_mapper(struct videobuf_queue *q, |
0b62b737 HV |
537 | struct videobuf_buffer *buf, |
538 | struct vm_area_struct *vma) | |
7a7d9a89 | 539 | { |
0b62b737 | 540 | struct videobuf_dma_sg_memory *mem = buf->priv; |
7a7d9a89 | 541 | struct videobuf_mapping *map; |
474675ad | 542 | unsigned int first, last, size = 0, i; |
7a7d9a89 MCC |
543 | int retval; |
544 | ||
545 | retval = -EINVAL; | |
7a7d9a89 | 546 | |
0b62b737 HV |
547 | BUG_ON(!mem); |
548 | MAGIC_CHECK(mem->magic, MAGIC_SG_MEM); | |
549 | ||
7a7d9a89 MCC |
550 | /* look for first buffer to map */ |
551 | for (first = 0; first < VIDEO_MAX_FRAME; first++) { | |
0b62b737 HV |
552 | if (buf == q->bufs[first]) { |
553 | size = PAGE_ALIGN(q->bufs[first]->bsize); | |
7a7d9a89 | 554 | break; |
0b62b737 | 555 | } |
7a7d9a89 | 556 | } |
0b62b737 HV |
557 | |
558 | /* paranoia, should never happen since buf is always valid. */ | |
474675ad | 559 | if (!size) { |
7a02264c | 560 | dprintk(1, "mmap app bug: offset invalid [offset=0x%lx]\n", |
0b62b737 | 561 | (vma->vm_pgoff << PAGE_SHIFT)); |
7a7d9a89 MCC |
562 | goto done; |
563 | } | |
564 | ||
0b62b737 | 565 | last = first; |
7a7d9a89 MCC |
566 | |
567 | /* create mapping + update buffer list */ | |
568 | retval = -ENOMEM; | |
7a02264c | 569 | map = kmalloc(sizeof(struct videobuf_mapping), GFP_KERNEL); |
7a7d9a89 MCC |
570 | if (NULL == map) |
571 | goto done; | |
ce54093c BP |
572 | |
573 | size = 0; | |
574 | for (i = first; i <= last; i++) { | |
575 | if (NULL == q->bufs[i]) | |
576 | continue; | |
851c0c96 | 577 | q->bufs[i]->map = map; |
7a7d9a89 | 578 | q->bufs[i]->baddr = vma->vm_start + size; |
7cbefad0 | 579 | size += PAGE_ALIGN(q->bufs[i]->bsize); |
7a7d9a89 | 580 | } |
ce54093c | 581 | |
7a7d9a89 | 582 | map->count = 1; |
7a7d9a89 MCC |
583 | map->q = q; |
584 | vma->vm_ops = &videobuf_vm_ops; | |
585 | vma->vm_flags |= VM_DONTEXPAND | VM_RESERVED; | |
586 | vma->vm_flags &= ~VM_IO; /* using shared anonymous pages */ | |
587 | vma->vm_private_data = map; | |
7a02264c PO |
588 | dprintk(1, "mmap %p: q=%p %08lx-%08lx pgoff %08lx bufs %d-%d\n", |
589 | map, q, vma->vm_start, vma->vm_end, vma->vm_pgoff, first, last); | |
7a7d9a89 MCC |
590 | retval = 0; |
591 | ||
7a02264c | 592 | done: |
7a7d9a89 MCC |
593 | return retval; |
594 | } | |
595 | ||
0705135e | 596 | static struct videobuf_qtype_ops sg_ops = { |
7a7d9a89 MCC |
597 | .magic = MAGIC_QTYPE_OPS, |
598 | ||
33c38283 | 599 | .alloc_vb = __videobuf_alloc_vb, |
7a7d9a89 MCC |
600 | .iolock = __videobuf_iolock, |
601 | .sync = __videobuf_sync, | |
7a7d9a89 | 602 | .mmap_mapper = __videobuf_mmap_mapper, |
037c75eb | 603 | .vaddr = __videobuf_to_vaddr, |
7a7d9a89 MCC |
604 | }; |
605 | ||
0705135e | 606 | void *videobuf_sg_alloc(size_t size) |
7a7d9a89 MCC |
607 | { |
608 | struct videobuf_queue q; | |
609 | ||
610 | /* Required to make generic handler to call __videobuf_alloc */ | |
0705135e | 611 | q.int_ops = &sg_ops; |
7a7d9a89 | 612 | |
0705135e | 613 | q.msize = size; |
7a7d9a89 | 614 | |
33c38283 | 615 | return videobuf_alloc_vb(&q); |
7a7d9a89 | 616 | } |
7a02264c | 617 | EXPORT_SYMBOL_GPL(videobuf_sg_alloc); |
7a7d9a89 | 618 | |
7a02264c | 619 | void videobuf_queue_sg_init(struct videobuf_queue *q, |
38a54f35 | 620 | const struct videobuf_queue_ops *ops, |
0705135e | 621 | struct device *dev, |
7a7d9a89 MCC |
622 | spinlock_t *irqlock, |
623 | enum v4l2_buf_type type, | |
624 | enum v4l2_field field, | |
625 | unsigned int msize, | |
08bff03e HV |
626 | void *priv, |
627 | struct mutex *ext_lock) | |
7a7d9a89 | 628 | { |
d4cae5a5 | 629 | videobuf_queue_core_init(q, ops, dev, irqlock, type, field, msize, |
08bff03e | 630 | priv, &sg_ops, ext_lock); |
7a7d9a89 | 631 | } |
0705135e | 632 | EXPORT_SYMBOL_GPL(videobuf_queue_sg_init); |
7a7d9a89 | 633 |