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 | |
0705135e | 282 | int videobuf_dma_sync(struct videobuf_queue *q, struct videobuf_dmabuf *dma) |
7a7d9a89 | 283 | { |
0705135e | 284 | MAGIC_CHECK(dma->magic, MAGIC_DMABUF); |
7a7d9a89 MCC |
285 | BUG_ON(!dma->sglen); |
286 | ||
0705135e | 287 | dma_sync_sg_for_cpu(q->dev, dma->sglist, dma->nr_pages, dma->direction); |
7a02264c | 288 | |
7a7d9a89 MCC |
289 | return 0; |
290 | } | |
7a02264c | 291 | EXPORT_SYMBOL_GPL(videobuf_dma_sync); |
7a7d9a89 | 292 | |
7a02264c | 293 | int videobuf_dma_unmap(struct videobuf_queue *q, struct videobuf_dmabuf *dma) |
7a7d9a89 | 294 | { |
0705135e | 295 | MAGIC_CHECK(dma->magic, MAGIC_DMABUF); |
7a02264c | 296 | |
7a7d9a89 MCC |
297 | if (!dma->sglen) |
298 | return 0; | |
299 | ||
0705135e | 300 | dma_unmap_sg(q->dev, dma->sglist, dma->nr_pages, dma->direction); |
5ddff434 | 301 | |
1010ed13 | 302 | vfree(dma->sglist); |
7a7d9a89 MCC |
303 | dma->sglist = NULL; |
304 | dma->sglen = 0; | |
7a02264c | 305 | |
7a7d9a89 MCC |
306 | return 0; |
307 | } | |
7a02264c | 308 | EXPORT_SYMBOL_GPL(videobuf_dma_unmap); |
7a7d9a89 MCC |
309 | |
310 | int videobuf_dma_free(struct videobuf_dmabuf *dma) | |
311 | { | |
7a02264c PO |
312 | int i; |
313 | MAGIC_CHECK(dma->magic, MAGIC_DMABUF); | |
7a7d9a89 MCC |
314 | BUG_ON(dma->sglen); |
315 | ||
316 | if (dma->pages) { | |
7a02264c | 317 | for (i = 0; i < dma->nr_pages; i++) |
7a7d9a89 MCC |
318 | page_cache_release(dma->pages[i]); |
319 | kfree(dma->pages); | |
320 | dma->pages = NULL; | |
321 | } | |
322 | ||
323 | vfree(dma->vmalloc); | |
324 | dma->vmalloc = NULL; | |
7a7d9a89 | 325 | |
7a02264c | 326 | if (dma->bus_addr) |
7a7d9a89 | 327 | dma->bus_addr = 0; |
0705135e | 328 | dma->direction = DMA_NONE; |
7a02264c | 329 | |
7a7d9a89 MCC |
330 | return 0; |
331 | } | |
7a02264c | 332 | EXPORT_SYMBOL_GPL(videobuf_dma_free); |
7a7d9a89 MCC |
333 | |
334 | /* --------------------------------------------------------------------- */ | |
335 | ||
0705135e | 336 | int videobuf_sg_dma_map(struct device *dev, struct videobuf_dmabuf *dma) |
7a7d9a89 MCC |
337 | { |
338 | struct videobuf_queue q; | |
7a7d9a89 | 339 | |
0705135e | 340 | q.dev = dev; |
7a7d9a89 | 341 | |
0705135e | 342 | return videobuf_dma_map(&q, dma); |
7a7d9a89 | 343 | } |
7a02264c | 344 | EXPORT_SYMBOL_GPL(videobuf_sg_dma_map); |
7a7d9a89 | 345 | |
0705135e | 346 | int videobuf_sg_dma_unmap(struct device *dev, struct videobuf_dmabuf *dma) |
7a7d9a89 MCC |
347 | { |
348 | struct videobuf_queue q; | |
7a7d9a89 | 349 | |
0705135e | 350 | q.dev = dev; |
7a7d9a89 | 351 | |
0705135e | 352 | return videobuf_dma_unmap(&q, dma); |
7a7d9a89 | 353 | } |
7a02264c | 354 | EXPORT_SYMBOL_GPL(videobuf_sg_dma_unmap); |
7a7d9a89 MCC |
355 | |
356 | /* --------------------------------------------------------------------- */ | |
357 | ||
7a02264c | 358 | static void videobuf_vm_open(struct vm_area_struct *vma) |
7a7d9a89 MCC |
359 | { |
360 | struct videobuf_mapping *map = vma->vm_private_data; | |
361 | ||
7a02264c PO |
362 | dprintk(2, "vm_open %p [count=%d,vma=%08lx-%08lx]\n", map, |
363 | map->count, vma->vm_start, vma->vm_end); | |
364 | ||
7a7d9a89 MCC |
365 | map->count++; |
366 | } | |
367 | ||
7a02264c | 368 | static void videobuf_vm_close(struct vm_area_struct *vma) |
7a7d9a89 MCC |
369 | { |
370 | struct videobuf_mapping *map = vma->vm_private_data; | |
371 | struct videobuf_queue *q = map->q; | |
0705135e | 372 | struct videobuf_dma_sg_memory *mem; |
7a7d9a89 MCC |
373 | int i; |
374 | ||
7a02264c PO |
375 | dprintk(2, "vm_close %p [count=%d,vma=%08lx-%08lx]\n", map, |
376 | map->count, vma->vm_start, vma->vm_end); | |
7a7d9a89 MCC |
377 | |
378 | map->count--; | |
379 | if (0 == map->count) { | |
7a02264c | 380 | dprintk(1, "munmap %p q=%p\n", map, q); |
64f9477f | 381 | mutex_lock(&q->vb_lock); |
7a7d9a89 MCC |
382 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { |
383 | if (NULL == q->bufs[i]) | |
384 | continue; | |
7a02264c | 385 | mem = q->bufs[i]->priv; |
7a7d9a89 MCC |
386 | if (!mem) |
387 | continue; | |
388 | ||
7a02264c | 389 | MAGIC_CHECK(mem->magic, MAGIC_SG_MEM); |
7a7d9a89 | 390 | |
851c0c96 | 391 | if (q->bufs[i]->map != map) |
7a7d9a89 | 392 | continue; |
851c0c96 | 393 | q->bufs[i]->map = NULL; |
7a7d9a89 | 394 | q->bufs[i]->baddr = 0; |
7a02264c | 395 | q->ops->buf_release(q, q->bufs[i]); |
7a7d9a89 | 396 | } |
64f9477f | 397 | mutex_unlock(&q->vb_lock); |
7a7d9a89 MCC |
398 | kfree(map); |
399 | } | |
400 | return; | |
401 | } | |
402 | ||
403 | /* | |
404 | * Get a anonymous page for the mapping. Make sure we can DMA to that | |
405 | * memory location with 32bit PCI devices (i.e. don't use highmem for | |
406 | * now ...). Bounce buffers don't work very well for the data rates | |
407 | * video capture has. | |
408 | */ | |
7a02264c | 409 | static int videobuf_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
7a7d9a89 MCC |
410 | { |
411 | struct page *page; | |
412 | ||
7a02264c PO |
413 | dprintk(3, "fault: fault @ %08lx [vma %08lx-%08lx]\n", |
414 | (unsigned long)vmf->virtual_address, | |
415 | vma->vm_start, vma->vm_end); | |
416 | ||
7a7d9a89 MCC |
417 | page = alloc_page(GFP_USER | __GFP_DMA32); |
418 | if (!page) | |
105354a0 | 419 | return VM_FAULT_OOM; |
c0cd5010 | 420 | clear_user_highpage(page, (unsigned long)vmf->virtual_address); |
105354a0 | 421 | vmf->page = page; |
7a02264c | 422 | |
105354a0 | 423 | return 0; |
7a7d9a89 MCC |
424 | } |
425 | ||
7a02264c PO |
426 | static const struct vm_operations_struct videobuf_vm_ops = { |
427 | .open = videobuf_vm_open, | |
428 | .close = videobuf_vm_close, | |
429 | .fault = videobuf_vm_fault, | |
7a7d9a89 MCC |
430 | }; |
431 | ||
432 | /* --------------------------------------------------------------------- | |
0705135e | 433 | * SG handlers for the generic methods |
7a7d9a89 MCC |
434 | */ |
435 | ||
436 | /* Allocated area consists on 3 parts: | |
437 | struct video_buffer | |
438 | struct <driver>_buffer (cx88_buffer, saa7134_buf, ...) | |
0705135e | 439 | struct videobuf_dma_sg_memory |
7a7d9a89 MCC |
440 | */ |
441 | ||
a4cf4cac | 442 | static struct videobuf_buffer *__videobuf_alloc(size_t size) |
7a7d9a89 | 443 | { |
0705135e | 444 | struct videobuf_dma_sg_memory *mem; |
7a7d9a89 MCC |
445 | struct videobuf_buffer *vb; |
446 | ||
7a02264c | 447 | vb = kzalloc(size + sizeof(*mem), GFP_KERNEL); |
bee527f9 PO |
448 | if (!vb) |
449 | return vb; | |
7a7d9a89 | 450 | |
7a02264c PO |
451 | mem = vb->priv = ((char *)vb) + size; |
452 | mem->magic = MAGIC_SG_MEM; | |
7a7d9a89 MCC |
453 | |
454 | videobuf_dma_init(&mem->dma); | |
455 | ||
7a02264c PO |
456 | dprintk(1, "%s: allocated at %p(%ld+%ld) & %p(%ld)\n", |
457 | __func__, vb, (long)sizeof(*vb), (long)size - sizeof(*vb), | |
458 | mem, (long)sizeof(*mem)); | |
7a7d9a89 MCC |
459 | |
460 | return vb; | |
461 | } | |
462 | ||
037c75eb | 463 | static void *__videobuf_to_vaddr(struct videobuf_buffer *buf) |
59d34489 MCC |
464 | { |
465 | struct videobuf_dma_sg_memory *mem = buf->priv; | |
466 | BUG_ON(!mem); | |
467 | ||
468 | MAGIC_CHECK(mem->magic, MAGIC_SG_MEM); | |
469 | ||
470 | return mem->dma.vmalloc; | |
471 | } | |
472 | ||
7a02264c PO |
473 | static int __videobuf_iolock(struct videobuf_queue *q, |
474 | struct videobuf_buffer *vb, | |
475 | struct v4l2_framebuffer *fbuf) | |
7a7d9a89 | 476 | { |
7a02264c | 477 | int err, pages; |
7a7d9a89 | 478 | dma_addr_t bus; |
0705135e | 479 | struct videobuf_dma_sg_memory *mem = vb->priv; |
7a7d9a89 MCC |
480 | BUG_ON(!mem); |
481 | ||
0705135e | 482 | MAGIC_CHECK(mem->magic, MAGIC_SG_MEM); |
7a7d9a89 MCC |
483 | |
484 | switch (vb->memory) { | |
485 | case V4L2_MEMORY_MMAP: | |
486 | case V4L2_MEMORY_USERPTR: | |
487 | if (0 == vb->baddr) { | |
488 | /* no userspace addr -- kernel bounce buffer */ | |
489 | pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT; | |
7a02264c PO |
490 | err = videobuf_dma_init_kernel(&mem->dma, |
491 | DMA_FROM_DEVICE, | |
492 | pages); | |
7a7d9a89 MCC |
493 | if (0 != err) |
494 | return err; | |
9900132f | 495 | } else if (vb->memory == V4L2_MEMORY_USERPTR) { |
7a7d9a89 | 496 | /* dma directly to userspace */ |
7a02264c PO |
497 | err = videobuf_dma_init_user(&mem->dma, |
498 | DMA_FROM_DEVICE, | |
499 | vb->baddr, vb->bsize); | |
7a7d9a89 MCC |
500 | if (0 != err) |
501 | return err; | |
9900132f ML |
502 | } else { |
503 | /* NOTE: HACK: videobuf_iolock on V4L2_MEMORY_MMAP | |
504 | buffers can only be called from videobuf_qbuf | |
505 | we take current->mm->mmap_sem there, to prevent | |
506 | locking inversion, so don't take it here */ | |
507 | ||
508 | err = videobuf_dma_init_user_locked(&mem->dma, | |
0705135e | 509 | DMA_FROM_DEVICE, |
9900132f ML |
510 | vb->baddr, vb->bsize); |
511 | if (0 != err) | |
512 | return err; | |
7a7d9a89 MCC |
513 | } |
514 | break; | |
515 | case V4L2_MEMORY_OVERLAY: | |
516 | if (NULL == fbuf) | |
517 | return -EINVAL; | |
518 | /* FIXME: need sanity checks for vb->boff */ | |
519 | /* | |
520 | * Using a double cast to avoid compiler warnings when | |
521 | * building for PAE. Compiler doesn't like direct casting | |
522 | * of a 32 bit ptr to 64 bit integer. | |
523 | */ | |
524 | bus = (dma_addr_t)(unsigned long)fbuf->base + vb->boff; | |
525 | pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT; | |
0705135e | 526 | err = videobuf_dma_init_overlay(&mem->dma, DMA_FROM_DEVICE, |
7a7d9a89 MCC |
527 | bus, pages); |
528 | if (0 != err) | |
529 | return err; | |
530 | break; | |
531 | default: | |
532 | BUG(); | |
533 | } | |
0705135e | 534 | err = videobuf_dma_map(q, &mem->dma); |
7a7d9a89 MCC |
535 | if (0 != err) |
536 | return err; | |
537 | ||
538 | return 0; | |
539 | } | |
540 | ||
541 | static int __videobuf_sync(struct videobuf_queue *q, | |
542 | struct videobuf_buffer *buf) | |
543 | { | |
0705135e GL |
544 | struct videobuf_dma_sg_memory *mem = buf->priv; |
545 | BUG_ON(!mem); | |
7a02264c | 546 | MAGIC_CHECK(mem->magic, MAGIC_SG_MEM); |
7a7d9a89 | 547 | |
7a02264c | 548 | return videobuf_dma_sync(q, &mem->dma); |
7a7d9a89 MCC |
549 | } |
550 | ||
7a7d9a89 MCC |
551 | static int __videobuf_mmap_mapper(struct videobuf_queue *q, |
552 | struct vm_area_struct *vma) | |
553 | { | |
0705135e | 554 | struct videobuf_dma_sg_memory *mem; |
7a7d9a89 | 555 | struct videobuf_mapping *map; |
7a02264c | 556 | unsigned int first, last, size, i; |
7a7d9a89 MCC |
557 | int retval; |
558 | ||
559 | retval = -EINVAL; | |
560 | if (!(vma->vm_flags & VM_WRITE)) { | |
7a02264c | 561 | dprintk(1, "mmap app bug: PROT_WRITE please\n"); |
7a7d9a89 MCC |
562 | goto done; |
563 | } | |
564 | if (!(vma->vm_flags & VM_SHARED)) { | |
7a02264c | 565 | dprintk(1, "mmap app bug: MAP_SHARED please\n"); |
7a7d9a89 MCC |
566 | goto done; |
567 | } | |
568 | ||
ce54093c BP |
569 | /* This function maintains backwards compatibility with V4L1 and will |
570 | * map more than one buffer if the vma length is equal to the combined | |
571 | * size of multiple buffers than it will map them together. See | |
572 | * VIDIOCGMBUF in the v4l spec | |
573 | * | |
574 | * TODO: Allow drivers to specify if they support this mode | |
575 | */ | |
576 | ||
7a7d9a89 MCC |
577 | /* look for first buffer to map */ |
578 | for (first = 0; first < VIDEO_MAX_FRAME; first++) { | |
579 | if (NULL == q->bufs[first]) | |
580 | continue; | |
7a02264c | 581 | mem = q->bufs[first]->priv; |
0705135e | 582 | BUG_ON(!mem); |
7a02264c | 583 | MAGIC_CHECK(mem->magic, MAGIC_SG_MEM); |
7a7d9a89 MCC |
584 | |
585 | if (V4L2_MEMORY_MMAP != q->bufs[first]->memory) | |
586 | continue; | |
587 | if (q->bufs[first]->boff == (vma->vm_pgoff << PAGE_SHIFT)) | |
588 | break; | |
589 | } | |
590 | if (VIDEO_MAX_FRAME == first) { | |
7a02264c | 591 | dprintk(1, "mmap app bug: offset invalid [offset=0x%lx]\n", |
7a7d9a89 MCC |
592 | (vma->vm_pgoff << PAGE_SHIFT)); |
593 | goto done; | |
594 | } | |
595 | ||
596 | /* look for last buffer to map */ | |
597 | for (size = 0, last = first; last < VIDEO_MAX_FRAME; last++) { | |
598 | if (NULL == q->bufs[last]) | |
599 | continue; | |
600 | if (V4L2_MEMORY_MMAP != q->bufs[last]->memory) | |
601 | continue; | |
851c0c96 | 602 | if (q->bufs[last]->map) { |
7a7d9a89 MCC |
603 | retval = -EBUSY; |
604 | goto done; | |
605 | } | |
7cbefad0 | 606 | size += PAGE_ALIGN(q->bufs[last]->bsize); |
7a7d9a89 MCC |
607 | if (size == (vma->vm_end - vma->vm_start)) |
608 | break; | |
609 | } | |
610 | if (VIDEO_MAX_FRAME == last) { | |
7a02264c | 611 | dprintk(1, "mmap app bug: size invalid [size=0x%lx]\n", |
7a7d9a89 MCC |
612 | (vma->vm_end - vma->vm_start)); |
613 | goto done; | |
614 | } | |
615 | ||
616 | /* create mapping + update buffer list */ | |
617 | retval = -ENOMEM; | |
7a02264c | 618 | map = kmalloc(sizeof(struct videobuf_mapping), GFP_KERNEL); |
7a7d9a89 MCC |
619 | if (NULL == map) |
620 | goto done; | |
ce54093c BP |
621 | |
622 | size = 0; | |
623 | for (i = first; i <= last; i++) { | |
624 | if (NULL == q->bufs[i]) | |
625 | continue; | |
851c0c96 | 626 | q->bufs[i]->map = map; |
7a7d9a89 | 627 | q->bufs[i]->baddr = vma->vm_start + size; |
7cbefad0 | 628 | size += PAGE_ALIGN(q->bufs[i]->bsize); |
7a7d9a89 | 629 | } |
ce54093c | 630 | |
7a7d9a89 MCC |
631 | map->count = 1; |
632 | map->start = vma->vm_start; | |
633 | map->end = vma->vm_end; | |
634 | map->q = q; | |
635 | vma->vm_ops = &videobuf_vm_ops; | |
636 | vma->vm_flags |= VM_DONTEXPAND | VM_RESERVED; | |
637 | vma->vm_flags &= ~VM_IO; /* using shared anonymous pages */ | |
638 | vma->vm_private_data = map; | |
7a02264c PO |
639 | dprintk(1, "mmap %p: q=%p %08lx-%08lx pgoff %08lx bufs %d-%d\n", |
640 | map, q, vma->vm_start, vma->vm_end, vma->vm_pgoff, first, last); | |
7a7d9a89 MCC |
641 | retval = 0; |
642 | ||
7a02264c | 643 | done: |
7a7d9a89 MCC |
644 | return retval; |
645 | } | |
646 | ||
0705135e | 647 | static struct videobuf_qtype_ops sg_ops = { |
7a7d9a89 MCC |
648 | .magic = MAGIC_QTYPE_OPS, |
649 | ||
650 | .alloc = __videobuf_alloc, | |
651 | .iolock = __videobuf_iolock, | |
652 | .sync = __videobuf_sync, | |
7a7d9a89 | 653 | .mmap_mapper = __videobuf_mmap_mapper, |
037c75eb | 654 | .vaddr = __videobuf_to_vaddr, |
7a7d9a89 MCC |
655 | }; |
656 | ||
0705135e | 657 | void *videobuf_sg_alloc(size_t size) |
7a7d9a89 MCC |
658 | { |
659 | struct videobuf_queue q; | |
660 | ||
661 | /* Required to make generic handler to call __videobuf_alloc */ | |
0705135e | 662 | q.int_ops = &sg_ops; |
7a7d9a89 | 663 | |
0705135e | 664 | q.msize = size; |
7a7d9a89 | 665 | |
0705135e | 666 | return videobuf_alloc(&q); |
7a7d9a89 | 667 | } |
7a02264c | 668 | EXPORT_SYMBOL_GPL(videobuf_sg_alloc); |
7a7d9a89 | 669 | |
7a02264c | 670 | void videobuf_queue_sg_init(struct videobuf_queue *q, |
38a54f35 | 671 | const struct videobuf_queue_ops *ops, |
0705135e | 672 | struct device *dev, |
7a7d9a89 MCC |
673 | spinlock_t *irqlock, |
674 | enum v4l2_buf_type type, | |
675 | enum v4l2_field field, | |
676 | unsigned int msize, | |
677 | void *priv) | |
678 | { | |
d4cae5a5 | 679 | videobuf_queue_core_init(q, ops, dev, irqlock, type, field, msize, |
0705135e | 680 | priv, &sg_ops); |
7a7d9a89 | 681 | } |
0705135e | 682 | EXPORT_SYMBOL_GPL(videobuf_queue_sg_init); |
7a7d9a89 | 683 |