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 | ||
7a02264c | 60 | struct scatterlist *videobuf_vmalloc_to_sg(unsigned char *virt, int nr_pages) |
7a7d9a89 MCC |
61 | { |
62 | struct scatterlist *sglist; | |
63 | struct page *pg; | |
64 | int i; | |
65 | ||
1010ed13 | 66 | sglist = vmalloc(nr_pages * sizeof(*sglist)); |
7a7d9a89 MCC |
67 | if (NULL == sglist) |
68 | return NULL; | |
1010ed13 | 69 | memset(sglist, 0, nr_pages * sizeof(*sglist)); |
45711f1a | 70 | sg_init_table(sglist, nr_pages); |
7a7d9a89 MCC |
71 | for (i = 0; i < nr_pages; i++, virt += PAGE_SIZE) { |
72 | pg = vmalloc_to_page(virt); | |
73 | if (NULL == pg) | |
74 | goto err; | |
75 | BUG_ON(PageHighMem(pg)); | |
642f1490 | 76 | sg_set_page(&sglist[i], pg, PAGE_SIZE, 0); |
7a7d9a89 MCC |
77 | } |
78 | return sglist; | |
79 | ||
7a02264c | 80 | err: |
1010ed13 | 81 | vfree(sglist); |
7a7d9a89 MCC |
82 | return NULL; |
83 | } | |
7a02264c | 84 | EXPORT_SYMBOL_GPL(videobuf_vmalloc_to_sg); |
7a7d9a89 | 85 | |
7a02264c PO |
86 | struct scatterlist *videobuf_pages_to_sg(struct page **pages, int nr_pages, |
87 | int offset) | |
7a7d9a89 MCC |
88 | { |
89 | struct scatterlist *sglist; | |
a47cacbd | 90 | int i; |
7a7d9a89 MCC |
91 | |
92 | if (NULL == pages[0]) | |
93 | return NULL; | |
1010ed13 | 94 | sglist = vmalloc(nr_pages * sizeof(*sglist)); |
7a7d9a89 MCC |
95 | if (NULL == sglist) |
96 | return NULL; | |
45711f1a | 97 | sg_init_table(sglist, nr_pages); |
7a7d9a89 | 98 | |
7a7d9a89 MCC |
99 | if (PageHighMem(pages[0])) |
100 | /* DMA to highmem pages might not work */ | |
101 | goto highmem; | |
642f1490 | 102 | sg_set_page(&sglist[0], pages[0], PAGE_SIZE - offset, offset); |
7a7d9a89 MCC |
103 | for (i = 1; i < nr_pages; i++) { |
104 | if (NULL == pages[i]) | |
105 | goto nopage; | |
106 | if (PageHighMem(pages[i])) | |
107 | goto highmem; | |
642f1490 | 108 | sg_set_page(&sglist[i], pages[i], PAGE_SIZE, 0); |
7a7d9a89 MCC |
109 | } |
110 | return sglist; | |
111 | ||
7a02264c PO |
112 | nopage: |
113 | dprintk(2, "sgl: oops - no page\n"); | |
1010ed13 | 114 | vfree(sglist); |
7a7d9a89 MCC |
115 | return NULL; |
116 | ||
7a02264c PO |
117 | highmem: |
118 | dprintk(2, "sgl: oops - highmem page\n"); | |
1010ed13 | 119 | vfree(sglist); |
7a7d9a89 MCC |
120 | return NULL; |
121 | } | |
122 | ||
123 | /* --------------------------------------------------------------------- */ | |
124 | ||
7a02264c | 125 | struct videobuf_dmabuf *videobuf_to_dma(struct videobuf_buffer *buf) |
7a7d9a89 | 126 | { |
0705135e GL |
127 | struct videobuf_dma_sg_memory *mem = buf->priv; |
128 | BUG_ON(!mem); | |
7a7d9a89 | 129 | |
0705135e | 130 | MAGIC_CHECK(mem->magic, MAGIC_SG_MEM); |
7a7d9a89 MCC |
131 | |
132 | return &mem->dma; | |
133 | } | |
7a02264c | 134 | EXPORT_SYMBOL_GPL(videobuf_to_dma); |
7a7d9a89 MCC |
135 | |
136 | void videobuf_dma_init(struct videobuf_dmabuf *dma) | |
137 | { | |
7a02264c | 138 | memset(dma, 0, sizeof(*dma)); |
7a7d9a89 MCC |
139 | dma->magic = MAGIC_DMABUF; |
140 | } | |
7a02264c | 141 | EXPORT_SYMBOL_GPL(videobuf_dma_init); |
7a7d9a89 | 142 | |
9900132f ML |
143 | static int videobuf_dma_init_user_locked(struct videobuf_dmabuf *dma, |
144 | int direction, unsigned long data, unsigned long size) | |
7a7d9a89 | 145 | { |
7a02264c | 146 | unsigned long first, last; |
7a7d9a89 MCC |
147 | int err, rw = 0; |
148 | ||
149 | dma->direction = direction; | |
150 | switch (dma->direction) { | |
0705135e GL |
151 | case DMA_FROM_DEVICE: |
152 | rw = READ; | |
153 | break; | |
154 | case DMA_TO_DEVICE: | |
155 | rw = WRITE; | |
156 | break; | |
157 | default: | |
158 | BUG(); | |
7a7d9a89 MCC |
159 | } |
160 | ||
161 | first = (data & PAGE_MASK) >> PAGE_SHIFT; | |
162 | last = ((data+size-1) & PAGE_MASK) >> PAGE_SHIFT; | |
163 | dma->offset = data & ~PAGE_MASK; | |
164 | dma->nr_pages = last-first+1; | |
7a02264c | 165 | dma->pages = kmalloc(dma->nr_pages * sizeof(struct page *), GFP_KERNEL); |
7a7d9a89 MCC |
166 | if (NULL == dma->pages) |
167 | return -ENOMEM; | |
7a7d9a89 | 168 | |
7a02264c PO |
169 | dprintk(1, "init user [0x%lx+0x%lx => %d pages]\n", |
170 | data, size, dma->nr_pages); | |
171 | ||
172 | err = get_user_pages(current, current->mm, | |
7a7d9a89 MCC |
173 | data & PAGE_MASK, dma->nr_pages, |
174 | rw == READ, 1, /* force */ | |
175 | dma->pages, NULL); | |
9900132f | 176 | |
7a7d9a89 MCC |
177 | if (err != dma->nr_pages) { |
178 | dma->nr_pages = (err >= 0) ? err : 0; | |
7a02264c | 179 | dprintk(1, "get_user_pages: err=%d [%d]\n", err, dma->nr_pages); |
7a7d9a89 MCC |
180 | return err < 0 ? err : -EINVAL; |
181 | } | |
182 | return 0; | |
183 | } | |
184 | ||
9900132f ML |
185 | int videobuf_dma_init_user(struct videobuf_dmabuf *dma, int direction, |
186 | unsigned long data, unsigned long size) | |
187 | { | |
188 | int ret; | |
7a02264c | 189 | |
9900132f ML |
190 | down_read(¤t->mm->mmap_sem); |
191 | ret = videobuf_dma_init_user_locked(dma, direction, data, size); | |
192 | up_read(¤t->mm->mmap_sem); | |
193 | ||
194 | return ret; | |
195 | } | |
7a02264c | 196 | EXPORT_SYMBOL_GPL(videobuf_dma_init_user); |
9900132f | 197 | |
7a7d9a89 MCC |
198 | int videobuf_dma_init_kernel(struct videobuf_dmabuf *dma, int direction, |
199 | int nr_pages) | |
200 | { | |
7a02264c PO |
201 | dprintk(1, "init kernel [%d pages]\n", nr_pages); |
202 | ||
7a7d9a89 MCC |
203 | dma->direction = direction; |
204 | dma->vmalloc = vmalloc_32(nr_pages << PAGE_SHIFT); | |
205 | if (NULL == dma->vmalloc) { | |
7a02264c | 206 | dprintk(1, "vmalloc_32(%d pages) failed\n", nr_pages); |
7a7d9a89 MCC |
207 | return -ENOMEM; |
208 | } | |
7a02264c PO |
209 | |
210 | dprintk(1, "vmalloc is at addr 0x%08lx, size=%d\n", | |
7a7d9a89 MCC |
211 | (unsigned long)dma->vmalloc, |
212 | nr_pages << PAGE_SHIFT); | |
7a02264c PO |
213 | |
214 | memset(dma->vmalloc, 0, nr_pages << PAGE_SHIFT); | |
7a7d9a89 | 215 | dma->nr_pages = nr_pages; |
7a02264c | 216 | |
7a7d9a89 MCC |
217 | return 0; |
218 | } | |
7a02264c | 219 | EXPORT_SYMBOL_GPL(videobuf_dma_init_kernel); |
7a7d9a89 MCC |
220 | |
221 | int videobuf_dma_init_overlay(struct videobuf_dmabuf *dma, int direction, | |
222 | dma_addr_t addr, int nr_pages) | |
223 | { | |
7a02264c PO |
224 | dprintk(1, "init overlay [%d pages @ bus 0x%lx]\n", |
225 | nr_pages, (unsigned long)addr); | |
7a7d9a89 | 226 | dma->direction = direction; |
7a02264c | 227 | |
7a7d9a89 MCC |
228 | if (0 == addr) |
229 | return -EINVAL; | |
230 | ||
231 | dma->bus_addr = addr; | |
232 | dma->nr_pages = nr_pages; | |
7a02264c | 233 | |
7a7d9a89 MCC |
234 | return 0; |
235 | } | |
7a02264c | 236 | EXPORT_SYMBOL_GPL(videobuf_dma_init_overlay); |
7a7d9a89 | 237 | |
7a02264c | 238 | int videobuf_dma_map(struct videobuf_queue *q, struct videobuf_dmabuf *dma) |
7a7d9a89 | 239 | { |
7a02264c | 240 | MAGIC_CHECK(dma->magic, MAGIC_DMABUF); |
7a7d9a89 MCC |
241 | BUG_ON(0 == dma->nr_pages); |
242 | ||
243 | if (dma->pages) { | |
244 | dma->sglist = videobuf_pages_to_sg(dma->pages, dma->nr_pages, | |
245 | dma->offset); | |
246 | } | |
247 | if (dma->vmalloc) { | |
7a02264c PO |
248 | dma->sglist = videobuf_vmalloc_to_sg(dma->vmalloc, |
249 | dma->nr_pages); | |
7a7d9a89 MCC |
250 | } |
251 | if (dma->bus_addr) { | |
1010ed13 | 252 | dma->sglist = vmalloc(sizeof(*dma->sglist)); |
7a7d9a89 | 253 | if (NULL != dma->sglist) { |
7a02264c PO |
254 | dma->sglen = 1; |
255 | sg_dma_address(&dma->sglist[0]) = dma->bus_addr | |
256 | & PAGE_MASK; | |
257 | dma->sglist[0].offset = dma->bus_addr & ~PAGE_MASK; | |
258 | sg_dma_len(&dma->sglist[0]) = dma->nr_pages * PAGE_SIZE; | |
7a7d9a89 MCC |
259 | } |
260 | } | |
261 | if (NULL == dma->sglist) { | |
7a02264c | 262 | dprintk(1, "scatterlist is NULL\n"); |
7a7d9a89 MCC |
263 | return -ENOMEM; |
264 | } | |
265 | if (!dma->bus_addr) { | |
0705135e | 266 | dma->sglen = dma_map_sg(q->dev, dma->sglist, |
7a7d9a89 | 267 | dma->nr_pages, dma->direction); |
7a7d9a89 MCC |
268 | if (0 == dma->sglen) { |
269 | printk(KERN_WARNING | |
7a02264c | 270 | "%s: videobuf_map_sg failed\n", __func__); |
1010ed13 | 271 | vfree(dma->sglist); |
7a7d9a89 MCC |
272 | dma->sglist = NULL; |
273 | dma->sglen = 0; | |
92051b28 | 274 | return -ENOMEM; |
7a7d9a89 MCC |
275 | } |
276 | } | |
7a02264c | 277 | |
7a7d9a89 MCC |
278 | return 0; |
279 | } | |
7a02264c | 280 | EXPORT_SYMBOL_GPL(videobuf_dma_map); |
7a7d9a89 | 281 | |
7a02264c | 282 | int videobuf_dma_unmap(struct videobuf_queue *q, struct videobuf_dmabuf *dma) |
7a7d9a89 | 283 | { |
0705135e | 284 | MAGIC_CHECK(dma->magic, MAGIC_DMABUF); |
7a02264c | 285 | |
7a7d9a89 MCC |
286 | if (!dma->sglen) |
287 | return 0; | |
288 | ||
0705135e | 289 | dma_unmap_sg(q->dev, dma->sglist, dma->nr_pages, dma->direction); |
5ddff434 | 290 | |
1010ed13 | 291 | vfree(dma->sglist); |
7a7d9a89 MCC |
292 | dma->sglist = NULL; |
293 | dma->sglen = 0; | |
7a02264c | 294 | |
7a7d9a89 MCC |
295 | return 0; |
296 | } | |
7a02264c | 297 | EXPORT_SYMBOL_GPL(videobuf_dma_unmap); |
7a7d9a89 MCC |
298 | |
299 | int videobuf_dma_free(struct videobuf_dmabuf *dma) | |
300 | { | |
7a02264c PO |
301 | int i; |
302 | MAGIC_CHECK(dma->magic, MAGIC_DMABUF); | |
7a7d9a89 MCC |
303 | BUG_ON(dma->sglen); |
304 | ||
305 | if (dma->pages) { | |
7a02264c | 306 | for (i = 0; i < dma->nr_pages; i++) |
7a7d9a89 MCC |
307 | page_cache_release(dma->pages[i]); |
308 | kfree(dma->pages); | |
309 | dma->pages = NULL; | |
310 | } | |
311 | ||
312 | vfree(dma->vmalloc); | |
313 | dma->vmalloc = NULL; | |
7a7d9a89 | 314 | |
7a02264c | 315 | if (dma->bus_addr) |
7a7d9a89 | 316 | dma->bus_addr = 0; |
0705135e | 317 | dma->direction = DMA_NONE; |
7a02264c | 318 | |
7a7d9a89 MCC |
319 | return 0; |
320 | } | |
7a02264c | 321 | EXPORT_SYMBOL_GPL(videobuf_dma_free); |
7a7d9a89 MCC |
322 | |
323 | /* --------------------------------------------------------------------- */ | |
324 | ||
0705135e | 325 | int videobuf_sg_dma_map(struct device *dev, struct videobuf_dmabuf *dma) |
7a7d9a89 MCC |
326 | { |
327 | struct videobuf_queue q; | |
7a7d9a89 | 328 | |
0705135e | 329 | q.dev = dev; |
7a7d9a89 | 330 | |
0705135e | 331 | return videobuf_dma_map(&q, dma); |
7a7d9a89 | 332 | } |
7a02264c | 333 | EXPORT_SYMBOL_GPL(videobuf_sg_dma_map); |
7a7d9a89 | 334 | |
0705135e | 335 | int videobuf_sg_dma_unmap(struct device *dev, struct videobuf_dmabuf *dma) |
7a7d9a89 MCC |
336 | { |
337 | struct videobuf_queue q; | |
7a7d9a89 | 338 | |
0705135e | 339 | q.dev = dev; |
7a7d9a89 | 340 | |
0705135e | 341 | return videobuf_dma_unmap(&q, dma); |
7a7d9a89 | 342 | } |
7a02264c | 343 | EXPORT_SYMBOL_GPL(videobuf_sg_dma_unmap); |
7a7d9a89 MCC |
344 | |
345 | /* --------------------------------------------------------------------- */ | |
346 | ||
7a02264c | 347 | static void videobuf_vm_open(struct vm_area_struct *vma) |
7a7d9a89 MCC |
348 | { |
349 | struct videobuf_mapping *map = vma->vm_private_data; | |
350 | ||
7a02264c PO |
351 | dprintk(2, "vm_open %p [count=%d,vma=%08lx-%08lx]\n", map, |
352 | map->count, vma->vm_start, vma->vm_end); | |
353 | ||
7a7d9a89 MCC |
354 | map->count++; |
355 | } | |
356 | ||
7a02264c | 357 | static void videobuf_vm_close(struct vm_area_struct *vma) |
7a7d9a89 MCC |
358 | { |
359 | struct videobuf_mapping *map = vma->vm_private_data; | |
360 | struct videobuf_queue *q = map->q; | |
0705135e | 361 | struct videobuf_dma_sg_memory *mem; |
7a7d9a89 MCC |
362 | int i; |
363 | ||
7a02264c PO |
364 | dprintk(2, "vm_close %p [count=%d,vma=%08lx-%08lx]\n", map, |
365 | map->count, vma->vm_start, vma->vm_end); | |
7a7d9a89 MCC |
366 | |
367 | map->count--; | |
368 | if (0 == map->count) { | |
7a02264c | 369 | dprintk(1, "munmap %p q=%p\n", map, q); |
64f9477f | 370 | mutex_lock(&q->vb_lock); |
7a7d9a89 MCC |
371 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { |
372 | if (NULL == q->bufs[i]) | |
373 | continue; | |
7a02264c | 374 | mem = q->bufs[i]->priv; |
7a7d9a89 MCC |
375 | if (!mem) |
376 | continue; | |
377 | ||
7a02264c | 378 | MAGIC_CHECK(mem->magic, MAGIC_SG_MEM); |
7a7d9a89 | 379 | |
851c0c96 | 380 | if (q->bufs[i]->map != map) |
7a7d9a89 | 381 | continue; |
851c0c96 | 382 | q->bufs[i]->map = NULL; |
7a7d9a89 | 383 | q->bufs[i]->baddr = 0; |
7a02264c | 384 | q->ops->buf_release(q, q->bufs[i]); |
7a7d9a89 | 385 | } |
64f9477f | 386 | mutex_unlock(&q->vb_lock); |
7a7d9a89 MCC |
387 | kfree(map); |
388 | } | |
389 | return; | |
390 | } | |
391 | ||
392 | /* | |
393 | * Get a anonymous page for the mapping. Make sure we can DMA to that | |
394 | * memory location with 32bit PCI devices (i.e. don't use highmem for | |
395 | * now ...). Bounce buffers don't work very well for the data rates | |
396 | * video capture has. | |
397 | */ | |
7a02264c | 398 | static int videobuf_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
7a7d9a89 MCC |
399 | { |
400 | struct page *page; | |
401 | ||
7a02264c PO |
402 | dprintk(3, "fault: fault @ %08lx [vma %08lx-%08lx]\n", |
403 | (unsigned long)vmf->virtual_address, | |
404 | vma->vm_start, vma->vm_end); | |
405 | ||
7a7d9a89 MCC |
406 | page = alloc_page(GFP_USER | __GFP_DMA32); |
407 | if (!page) | |
105354a0 | 408 | return VM_FAULT_OOM; |
c0cd5010 | 409 | clear_user_highpage(page, (unsigned long)vmf->virtual_address); |
105354a0 | 410 | vmf->page = page; |
7a02264c | 411 | |
105354a0 | 412 | return 0; |
7a7d9a89 MCC |
413 | } |
414 | ||
7a02264c PO |
415 | static const struct vm_operations_struct videobuf_vm_ops = { |
416 | .open = videobuf_vm_open, | |
417 | .close = videobuf_vm_close, | |
418 | .fault = videobuf_vm_fault, | |
7a7d9a89 MCC |
419 | }; |
420 | ||
421 | /* --------------------------------------------------------------------- | |
0705135e | 422 | * SG handlers for the generic methods |
7a7d9a89 MCC |
423 | */ |
424 | ||
425 | /* Allocated area consists on 3 parts: | |
426 | struct video_buffer | |
427 | struct <driver>_buffer (cx88_buffer, saa7134_buf, ...) | |
0705135e | 428 | struct videobuf_dma_sg_memory |
7a7d9a89 MCC |
429 | */ |
430 | ||
a4cf4cac | 431 | static struct videobuf_buffer *__videobuf_alloc(size_t size) |
7a7d9a89 | 432 | { |
0705135e | 433 | struct videobuf_dma_sg_memory *mem; |
7a7d9a89 MCC |
434 | struct videobuf_buffer *vb; |
435 | ||
7a02264c | 436 | vb = kzalloc(size + sizeof(*mem), GFP_KERNEL); |
bee527f9 PO |
437 | if (!vb) |
438 | return vb; | |
7a7d9a89 | 439 | |
7a02264c PO |
440 | mem = vb->priv = ((char *)vb) + size; |
441 | mem->magic = MAGIC_SG_MEM; | |
7a7d9a89 MCC |
442 | |
443 | videobuf_dma_init(&mem->dma); | |
444 | ||
7a02264c PO |
445 | dprintk(1, "%s: allocated at %p(%ld+%ld) & %p(%ld)\n", |
446 | __func__, vb, (long)sizeof(*vb), (long)size - sizeof(*vb), | |
447 | mem, (long)sizeof(*mem)); | |
7a7d9a89 MCC |
448 | |
449 | return vb; | |
450 | } | |
451 | ||
037c75eb | 452 | static void *__videobuf_to_vaddr(struct videobuf_buffer *buf) |
59d34489 MCC |
453 | { |
454 | struct videobuf_dma_sg_memory *mem = buf->priv; | |
455 | BUG_ON(!mem); | |
456 | ||
457 | MAGIC_CHECK(mem->magic, MAGIC_SG_MEM); | |
458 | ||
459 | return mem->dma.vmalloc; | |
460 | } | |
461 | ||
7a02264c PO |
462 | static int __videobuf_iolock(struct videobuf_queue *q, |
463 | struct videobuf_buffer *vb, | |
464 | struct v4l2_framebuffer *fbuf) | |
7a7d9a89 | 465 | { |
7a02264c | 466 | int err, pages; |
7a7d9a89 | 467 | dma_addr_t bus; |
0705135e | 468 | struct videobuf_dma_sg_memory *mem = vb->priv; |
7a7d9a89 MCC |
469 | BUG_ON(!mem); |
470 | ||
0705135e | 471 | MAGIC_CHECK(mem->magic, MAGIC_SG_MEM); |
7a7d9a89 MCC |
472 | |
473 | switch (vb->memory) { | |
474 | case V4L2_MEMORY_MMAP: | |
475 | case V4L2_MEMORY_USERPTR: | |
476 | if (0 == vb->baddr) { | |
477 | /* no userspace addr -- kernel bounce buffer */ | |
478 | pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT; | |
7a02264c PO |
479 | err = videobuf_dma_init_kernel(&mem->dma, |
480 | DMA_FROM_DEVICE, | |
481 | pages); | |
7a7d9a89 MCC |
482 | if (0 != err) |
483 | return err; | |
9900132f | 484 | } else if (vb->memory == V4L2_MEMORY_USERPTR) { |
7a7d9a89 | 485 | /* dma directly to userspace */ |
7a02264c PO |
486 | err = videobuf_dma_init_user(&mem->dma, |
487 | DMA_FROM_DEVICE, | |
488 | vb->baddr, vb->bsize); | |
7a7d9a89 MCC |
489 | if (0 != err) |
490 | return err; | |
9900132f ML |
491 | } else { |
492 | /* NOTE: HACK: videobuf_iolock on V4L2_MEMORY_MMAP | |
493 | buffers can only be called from videobuf_qbuf | |
494 | we take current->mm->mmap_sem there, to prevent | |
495 | locking inversion, so don't take it here */ | |
496 | ||
497 | err = videobuf_dma_init_user_locked(&mem->dma, | |
0705135e | 498 | DMA_FROM_DEVICE, |
9900132f ML |
499 | vb->baddr, vb->bsize); |
500 | if (0 != err) | |
501 | return err; | |
7a7d9a89 MCC |
502 | } |
503 | break; | |
504 | case V4L2_MEMORY_OVERLAY: | |
505 | if (NULL == fbuf) | |
506 | return -EINVAL; | |
507 | /* FIXME: need sanity checks for vb->boff */ | |
508 | /* | |
509 | * Using a double cast to avoid compiler warnings when | |
510 | * building for PAE. Compiler doesn't like direct casting | |
511 | * of a 32 bit ptr to 64 bit integer. | |
512 | */ | |
513 | bus = (dma_addr_t)(unsigned long)fbuf->base + vb->boff; | |
514 | pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT; | |
0705135e | 515 | err = videobuf_dma_init_overlay(&mem->dma, DMA_FROM_DEVICE, |
7a7d9a89 MCC |
516 | bus, pages); |
517 | if (0 != err) | |
518 | return err; | |
519 | break; | |
520 | default: | |
521 | BUG(); | |
522 | } | |
0705135e | 523 | err = videobuf_dma_map(q, &mem->dma); |
7a7d9a89 MCC |
524 | if (0 != err) |
525 | return err; | |
526 | ||
527 | return 0; | |
528 | } | |
529 | ||
530 | static int __videobuf_sync(struct videobuf_queue *q, | |
531 | struct videobuf_buffer *buf) | |
532 | { | |
0705135e | 533 | struct videobuf_dma_sg_memory *mem = buf->priv; |
97f8105d MCC |
534 | BUG_ON(!mem || !mem->dma.sglen); |
535 | ||
7a02264c | 536 | MAGIC_CHECK(mem->magic, MAGIC_SG_MEM); |
97f8105d | 537 | MAGIC_CHECK(mem->dma.magic, MAGIC_DMABUF); |
7a7d9a89 | 538 | |
97f8105d MCC |
539 | dma_sync_sg_for_cpu(q->dev, mem->dma.sglist, |
540 | mem->dma.nr_pages, mem->dma.direction); | |
541 | ||
542 | return 0; | |
7a7d9a89 MCC |
543 | } |
544 | ||
7a7d9a89 | 545 | static int __videobuf_mmap_mapper(struct videobuf_queue *q, |
0b62b737 HV |
546 | struct videobuf_buffer *buf, |
547 | struct vm_area_struct *vma) | |
7a7d9a89 | 548 | { |
0b62b737 | 549 | struct videobuf_dma_sg_memory *mem = buf->priv; |
7a7d9a89 | 550 | struct videobuf_mapping *map; |
474675ad | 551 | unsigned int first, last, size = 0, i; |
7a7d9a89 MCC |
552 | int retval; |
553 | ||
554 | retval = -EINVAL; | |
7a7d9a89 | 555 | |
ce54093c BP |
556 | /* This function maintains backwards compatibility with V4L1 and will |
557 | * map more than one buffer if the vma length is equal to the combined | |
558 | * size of multiple buffers than it will map them together. See | |
559 | * VIDIOCGMBUF in the v4l spec | |
560 | * | |
561 | * TODO: Allow drivers to specify if they support this mode | |
562 | */ | |
563 | ||
0b62b737 HV |
564 | BUG_ON(!mem); |
565 | MAGIC_CHECK(mem->magic, MAGIC_SG_MEM); | |
566 | ||
7a7d9a89 MCC |
567 | /* look for first buffer to map */ |
568 | for (first = 0; first < VIDEO_MAX_FRAME; first++) { | |
0b62b737 HV |
569 | if (buf == q->bufs[first]) { |
570 | size = PAGE_ALIGN(q->bufs[first]->bsize); | |
7a7d9a89 | 571 | break; |
0b62b737 | 572 | } |
7a7d9a89 | 573 | } |
0b62b737 HV |
574 | |
575 | /* paranoia, should never happen since buf is always valid. */ | |
474675ad | 576 | if (!size) { |
7a02264c | 577 | dprintk(1, "mmap app bug: offset invalid [offset=0x%lx]\n", |
0b62b737 | 578 | (vma->vm_pgoff << PAGE_SHIFT)); |
7a7d9a89 MCC |
579 | goto done; |
580 | } | |
581 | ||
0b62b737 HV |
582 | last = first; |
583 | #ifdef CONFIG_VIDEO_V4L1_COMPAT | |
584 | if (size != (vma->vm_end - vma->vm_start)) { | |
585 | /* look for last buffer to map */ | |
586 | for (last = first + 1; last < VIDEO_MAX_FRAME; last++) { | |
587 | if (NULL == q->bufs[last]) | |
588 | continue; | |
589 | if (V4L2_MEMORY_MMAP != q->bufs[last]->memory) | |
590 | continue; | |
591 | if (q->bufs[last]->map) { | |
592 | retval = -EBUSY; | |
593 | goto done; | |
594 | } | |
595 | size += PAGE_ALIGN(q->bufs[last]->bsize); | |
596 | if (size == (vma->vm_end - vma->vm_start)) | |
597 | break; | |
598 | } | |
599 | if (VIDEO_MAX_FRAME == last) { | |
600 | dprintk(1, "mmap app bug: size invalid [size=0x%lx]\n", | |
601 | (vma->vm_end - vma->vm_start)); | |
7a7d9a89 MCC |
602 | goto done; |
603 | } | |
7a7d9a89 | 604 | } |
0b62b737 | 605 | #endif |
7a7d9a89 MCC |
606 | |
607 | /* create mapping + update buffer list */ | |
608 | retval = -ENOMEM; | |
7a02264c | 609 | map = kmalloc(sizeof(struct videobuf_mapping), GFP_KERNEL); |
7a7d9a89 MCC |
610 | if (NULL == map) |
611 | goto done; | |
ce54093c BP |
612 | |
613 | size = 0; | |
614 | for (i = first; i <= last; i++) { | |
615 | if (NULL == q->bufs[i]) | |
616 | continue; | |
851c0c96 | 617 | q->bufs[i]->map = map; |
7a7d9a89 | 618 | q->bufs[i]->baddr = vma->vm_start + size; |
7cbefad0 | 619 | size += PAGE_ALIGN(q->bufs[i]->bsize); |
7a7d9a89 | 620 | } |
ce54093c | 621 | |
7a7d9a89 MCC |
622 | map->count = 1; |
623 | map->start = vma->vm_start; | |
624 | map->end = vma->vm_end; | |
625 | map->q = q; | |
626 | vma->vm_ops = &videobuf_vm_ops; | |
627 | vma->vm_flags |= VM_DONTEXPAND | VM_RESERVED; | |
628 | vma->vm_flags &= ~VM_IO; /* using shared anonymous pages */ | |
629 | vma->vm_private_data = map; | |
7a02264c PO |
630 | dprintk(1, "mmap %p: q=%p %08lx-%08lx pgoff %08lx bufs %d-%d\n", |
631 | map, q, vma->vm_start, vma->vm_end, vma->vm_pgoff, first, last); | |
7a7d9a89 MCC |
632 | retval = 0; |
633 | ||
7a02264c | 634 | done: |
7a7d9a89 MCC |
635 | return retval; |
636 | } | |
637 | ||
0705135e | 638 | static struct videobuf_qtype_ops sg_ops = { |
7a7d9a89 MCC |
639 | .magic = MAGIC_QTYPE_OPS, |
640 | ||
641 | .alloc = __videobuf_alloc, | |
642 | .iolock = __videobuf_iolock, | |
643 | .sync = __videobuf_sync, | |
7a7d9a89 | 644 | .mmap_mapper = __videobuf_mmap_mapper, |
037c75eb | 645 | .vaddr = __videobuf_to_vaddr, |
7a7d9a89 MCC |
646 | }; |
647 | ||
0705135e | 648 | void *videobuf_sg_alloc(size_t size) |
7a7d9a89 MCC |
649 | { |
650 | struct videobuf_queue q; | |
651 | ||
652 | /* Required to make generic handler to call __videobuf_alloc */ | |
0705135e | 653 | q.int_ops = &sg_ops; |
7a7d9a89 | 654 | |
0705135e | 655 | q.msize = size; |
7a7d9a89 | 656 | |
0705135e | 657 | return videobuf_alloc(&q); |
7a7d9a89 | 658 | } |
7a02264c | 659 | EXPORT_SYMBOL_GPL(videobuf_sg_alloc); |
7a7d9a89 | 660 | |
7a02264c | 661 | void videobuf_queue_sg_init(struct videobuf_queue *q, |
38a54f35 | 662 | const struct videobuf_queue_ops *ops, |
0705135e | 663 | struct device *dev, |
7a7d9a89 MCC |
664 | spinlock_t *irqlock, |
665 | enum v4l2_buf_type type, | |
666 | enum v4l2_field field, | |
667 | unsigned int msize, | |
668 | void *priv) | |
669 | { | |
d4cae5a5 | 670 | videobuf_queue_core_init(q, ops, dev, irqlock, type, field, msize, |
0705135e | 671 | priv, &sg_ops); |
7a7d9a89 | 672 | } |
0705135e | 673 | EXPORT_SYMBOL_GPL(videobuf_queue_sg_init); |
7a7d9a89 | 674 |