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 | { | |
7b4eeed1 JH |
214 | int i; |
215 | ||
7a02264c PO |
216 | dprintk(1, "init kernel [%d pages]\n", nr_pages); |
217 | ||
7a7d9a89 | 218 | dma->direction = direction; |
7b4eeed1 JH |
219 | dma->vaddr_pages = kcalloc(nr_pages, sizeof(*dma->vaddr_pages), |
220 | GFP_KERNEL); | |
221 | if (!dma->vaddr_pages) | |
222 | return -ENOMEM; | |
223 | ||
224 | dma->dma_addr = kcalloc(nr_pages, sizeof(*dma->dma_addr), GFP_KERNEL); | |
225 | if (!dma->dma_addr) { | |
226 | kfree(dma->vaddr_pages); | |
227 | return -ENOMEM; | |
228 | } | |
229 | for (i = 0; i < nr_pages; i++) { | |
230 | void *addr; | |
231 | ||
232 | addr = dma_alloc_coherent(dma->dev, PAGE_SIZE, | |
233 | &(dma->dma_addr[i]), GFP_KERNEL); | |
234 | if (addr == NULL) | |
235 | goto out_free_pages; | |
236 | ||
237 | dma->vaddr_pages[i] = virt_to_page(addr); | |
238 | } | |
239 | dma->vaddr = vmap(dma->vaddr_pages, nr_pages, VM_MAP | VM_IOREMAP, | |
240 | PAGE_KERNEL); | |
bb6dbe74 | 241 | if (NULL == dma->vaddr) { |
7a02264c | 242 | dprintk(1, "vmalloc_32(%d pages) failed\n", nr_pages); |
7b4eeed1 | 243 | goto out_free_pages; |
7a7d9a89 | 244 | } |
7a02264c PO |
245 | |
246 | dprintk(1, "vmalloc is at addr 0x%08lx, size=%d\n", | |
bb6dbe74 | 247 | (unsigned long)dma->vaddr, |
7a7d9a89 | 248 | nr_pages << PAGE_SHIFT); |
7a02264c | 249 | |
bb6dbe74 | 250 | memset(dma->vaddr, 0, nr_pages << PAGE_SHIFT); |
7a7d9a89 | 251 | dma->nr_pages = nr_pages; |
7a02264c | 252 | |
7a7d9a89 | 253 | return 0; |
7b4eeed1 JH |
254 | out_free_pages: |
255 | while (i > 0) { | |
23d3090f DC |
256 | void *addr; |
257 | ||
7b4eeed1 | 258 | i--; |
23d3090f DC |
259 | addr = page_address(dma->vaddr_pages[i]); |
260 | dma_free_coherent(dma->dev, PAGE_SIZE, addr, dma->dma_addr[i]); | |
7b4eeed1 JH |
261 | } |
262 | kfree(dma->dma_addr); | |
263 | dma->dma_addr = NULL; | |
264 | kfree(dma->vaddr_pages); | |
265 | dma->vaddr_pages = NULL; | |
266 | ||
267 | return -ENOMEM; | |
268 | ||
7a7d9a89 | 269 | } |
7a02264c | 270 | EXPORT_SYMBOL_GPL(videobuf_dma_init_kernel); |
7a7d9a89 MCC |
271 | |
272 | int videobuf_dma_init_overlay(struct videobuf_dmabuf *dma, int direction, | |
273 | dma_addr_t addr, int nr_pages) | |
274 | { | |
7a02264c PO |
275 | dprintk(1, "init overlay [%d pages @ bus 0x%lx]\n", |
276 | nr_pages, (unsigned long)addr); | |
7a7d9a89 | 277 | dma->direction = direction; |
7a02264c | 278 | |
7a7d9a89 MCC |
279 | if (0 == addr) |
280 | return -EINVAL; | |
281 | ||
282 | dma->bus_addr = addr; | |
283 | dma->nr_pages = nr_pages; | |
7a02264c | 284 | |
7a7d9a89 MCC |
285 | return 0; |
286 | } | |
7a02264c | 287 | EXPORT_SYMBOL_GPL(videobuf_dma_init_overlay); |
7a7d9a89 | 288 | |
95268403 | 289 | int videobuf_dma_map(struct device *dev, struct videobuf_dmabuf *dma) |
7a7d9a89 | 290 | { |
7a02264c | 291 | MAGIC_CHECK(dma->magic, MAGIC_DMABUF); |
7a7d9a89 MCC |
292 | BUG_ON(0 == dma->nr_pages); |
293 | ||
294 | if (dma->pages) { | |
295 | dma->sglist = videobuf_pages_to_sg(dma->pages, dma->nr_pages, | |
2fc11536 | 296 | dma->offset, dma->size); |
7a7d9a89 | 297 | } |
bb6dbe74 LP |
298 | if (dma->vaddr) { |
299 | dma->sglist = videobuf_vmalloc_to_sg(dma->vaddr, | |
7a02264c | 300 | dma->nr_pages); |
7a7d9a89 MCC |
301 | } |
302 | if (dma->bus_addr) { | |
1010ed13 | 303 | dma->sglist = vmalloc(sizeof(*dma->sglist)); |
7a7d9a89 | 304 | if (NULL != dma->sglist) { |
7a02264c PO |
305 | dma->sglen = 1; |
306 | sg_dma_address(&dma->sglist[0]) = dma->bus_addr | |
307 | & PAGE_MASK; | |
308 | dma->sglist[0].offset = dma->bus_addr & ~PAGE_MASK; | |
309 | sg_dma_len(&dma->sglist[0]) = dma->nr_pages * PAGE_SIZE; | |
7a7d9a89 MCC |
310 | } |
311 | } | |
312 | if (NULL == dma->sglist) { | |
7a02264c | 313 | dprintk(1, "scatterlist is NULL\n"); |
7a7d9a89 MCC |
314 | return -ENOMEM; |
315 | } | |
316 | if (!dma->bus_addr) { | |
95268403 | 317 | dma->sglen = dma_map_sg(dev, dma->sglist, |
7a7d9a89 | 318 | dma->nr_pages, dma->direction); |
7a7d9a89 MCC |
319 | if (0 == dma->sglen) { |
320 | printk(KERN_WARNING | |
7a02264c | 321 | "%s: videobuf_map_sg failed\n", __func__); |
1010ed13 | 322 | vfree(dma->sglist); |
7a7d9a89 MCC |
323 | dma->sglist = NULL; |
324 | dma->sglen = 0; | |
92051b28 | 325 | return -ENOMEM; |
7a7d9a89 MCC |
326 | } |
327 | } | |
7a02264c | 328 | |
7a7d9a89 MCC |
329 | return 0; |
330 | } | |
7a02264c | 331 | EXPORT_SYMBOL_GPL(videobuf_dma_map); |
7a7d9a89 | 332 | |
95268403 | 333 | int videobuf_dma_unmap(struct device *dev, struct videobuf_dmabuf *dma) |
7a7d9a89 | 334 | { |
0705135e | 335 | MAGIC_CHECK(dma->magic, MAGIC_DMABUF); |
7a02264c | 336 | |
7a7d9a89 MCC |
337 | if (!dma->sglen) |
338 | return 0; | |
339 | ||
95268403 | 340 | dma_unmap_sg(dev, dma->sglist, dma->sglen, dma->direction); |
5ddff434 | 341 | |
1010ed13 | 342 | vfree(dma->sglist); |
7a7d9a89 MCC |
343 | dma->sglist = NULL; |
344 | dma->sglen = 0; | |
7a02264c | 345 | |
7a7d9a89 MCC |
346 | return 0; |
347 | } | |
7a02264c | 348 | EXPORT_SYMBOL_GPL(videobuf_dma_unmap); |
7a7d9a89 MCC |
349 | |
350 | int videobuf_dma_free(struct videobuf_dmabuf *dma) | |
351 | { | |
7a02264c PO |
352 | int i; |
353 | MAGIC_CHECK(dma->magic, MAGIC_DMABUF); | |
7a7d9a89 MCC |
354 | BUG_ON(dma->sglen); |
355 | ||
356 | if (dma->pages) { | |
7a02264c | 357 | for (i = 0; i < dma->nr_pages; i++) |
7a7d9a89 MCC |
358 | page_cache_release(dma->pages[i]); |
359 | kfree(dma->pages); | |
360 | dma->pages = NULL; | |
361 | } | |
362 | ||
7b4eeed1 JH |
363 | if (dma->dma_addr) { |
364 | for (i = 0; i < dma->nr_pages; i++) { | |
365 | void *addr; | |
366 | ||
367 | addr = page_address(dma->vaddr_pages[i]); | |
368 | dma_free_coherent(dma->dev, PAGE_SIZE, addr, | |
369 | dma->dma_addr[i]); | |
370 | } | |
371 | kfree(dma->dma_addr); | |
372 | dma->dma_addr = NULL; | |
373 | kfree(dma->vaddr_pages); | |
374 | dma->vaddr_pages = NULL; | |
375 | vunmap(dma->vaddr); | |
376 | dma->vaddr = NULL; | |
377 | } | |
7a7d9a89 | 378 | |
7a02264c | 379 | if (dma->bus_addr) |
7a7d9a89 | 380 | dma->bus_addr = 0; |
0705135e | 381 | dma->direction = DMA_NONE; |
7a02264c | 382 | |
7a7d9a89 MCC |
383 | return 0; |
384 | } | |
7a02264c | 385 | EXPORT_SYMBOL_GPL(videobuf_dma_free); |
7a7d9a89 MCC |
386 | |
387 | /* --------------------------------------------------------------------- */ | |
388 | ||
7a02264c | 389 | static void videobuf_vm_open(struct vm_area_struct *vma) |
7a7d9a89 MCC |
390 | { |
391 | struct videobuf_mapping *map = vma->vm_private_data; | |
392 | ||
7a02264c PO |
393 | dprintk(2, "vm_open %p [count=%d,vma=%08lx-%08lx]\n", map, |
394 | map->count, vma->vm_start, vma->vm_end); | |
395 | ||
7a7d9a89 MCC |
396 | map->count++; |
397 | } | |
398 | ||
7a02264c | 399 | static void videobuf_vm_close(struct vm_area_struct *vma) |
7a7d9a89 MCC |
400 | { |
401 | struct videobuf_mapping *map = vma->vm_private_data; | |
402 | struct videobuf_queue *q = map->q; | |
0705135e | 403 | struct videobuf_dma_sg_memory *mem; |
7a7d9a89 MCC |
404 | int i; |
405 | ||
7a02264c PO |
406 | dprintk(2, "vm_close %p [count=%d,vma=%08lx-%08lx]\n", map, |
407 | map->count, vma->vm_start, vma->vm_end); | |
7a7d9a89 | 408 | |
cca36e2e HV |
409 | map->count--; |
410 | if (0 == map->count) { | |
7a02264c | 411 | dprintk(1, "munmap %p q=%p\n", map, q); |
cca36e2e | 412 | videobuf_queue_lock(q); |
7a7d9a89 MCC |
413 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { |
414 | if (NULL == q->bufs[i]) | |
415 | continue; | |
7a02264c | 416 | mem = q->bufs[i]->priv; |
7a7d9a89 MCC |
417 | if (!mem) |
418 | continue; | |
419 | ||
7a02264c | 420 | MAGIC_CHECK(mem->magic, MAGIC_SG_MEM); |
7a7d9a89 | 421 | |
851c0c96 | 422 | if (q->bufs[i]->map != map) |
7a7d9a89 | 423 | continue; |
851c0c96 | 424 | q->bufs[i]->map = NULL; |
7a7d9a89 | 425 | q->bufs[i]->baddr = 0; |
7a02264c | 426 | q->ops->buf_release(q, q->bufs[i]); |
7a7d9a89 | 427 | } |
cca36e2e | 428 | videobuf_queue_unlock(q); |
7a7d9a89 MCC |
429 | kfree(map); |
430 | } | |
431 | return; | |
432 | } | |
433 | ||
434 | /* | |
435 | * Get a anonymous page for the mapping. Make sure we can DMA to that | |
436 | * memory location with 32bit PCI devices (i.e. don't use highmem for | |
437 | * now ...). Bounce buffers don't work very well for the data rates | |
438 | * video capture has. | |
439 | */ | |
7a02264c | 440 | static int videobuf_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
7a7d9a89 MCC |
441 | { |
442 | struct page *page; | |
443 | ||
7a02264c PO |
444 | dprintk(3, "fault: fault @ %08lx [vma %08lx-%08lx]\n", |
445 | (unsigned long)vmf->virtual_address, | |
446 | vma->vm_start, vma->vm_end); | |
447 | ||
7a7d9a89 MCC |
448 | page = alloc_page(GFP_USER | __GFP_DMA32); |
449 | if (!page) | |
105354a0 | 450 | return VM_FAULT_OOM; |
c0cd5010 | 451 | clear_user_highpage(page, (unsigned long)vmf->virtual_address); |
105354a0 | 452 | vmf->page = page; |
7a02264c | 453 | |
105354a0 | 454 | return 0; |
7a7d9a89 MCC |
455 | } |
456 | ||
7a02264c PO |
457 | static const struct vm_operations_struct videobuf_vm_ops = { |
458 | .open = videobuf_vm_open, | |
459 | .close = videobuf_vm_close, | |
460 | .fault = videobuf_vm_fault, | |
7a7d9a89 MCC |
461 | }; |
462 | ||
463 | /* --------------------------------------------------------------------- | |
0705135e | 464 | * SG handlers for the generic methods |
7a7d9a89 MCC |
465 | */ |
466 | ||
467 | /* Allocated area consists on 3 parts: | |
468 | struct video_buffer | |
469 | struct <driver>_buffer (cx88_buffer, saa7134_buf, ...) | |
0705135e | 470 | struct videobuf_dma_sg_memory |
7a7d9a89 MCC |
471 | */ |
472 | ||
33c38283 | 473 | static struct videobuf_buffer *__videobuf_alloc_vb(size_t size) |
7a7d9a89 | 474 | { |
0705135e | 475 | struct videobuf_dma_sg_memory *mem; |
7a7d9a89 MCC |
476 | struct videobuf_buffer *vb; |
477 | ||
7a02264c | 478 | vb = kzalloc(size + sizeof(*mem), GFP_KERNEL); |
bee527f9 PO |
479 | if (!vb) |
480 | return vb; | |
7a7d9a89 | 481 | |
7a02264c PO |
482 | mem = vb->priv = ((char *)vb) + size; |
483 | mem->magic = MAGIC_SG_MEM; | |
7a7d9a89 MCC |
484 | |
485 | videobuf_dma_init(&mem->dma); | |
486 | ||
7a02264c PO |
487 | dprintk(1, "%s: allocated at %p(%ld+%ld) & %p(%ld)\n", |
488 | __func__, vb, (long)sizeof(*vb), (long)size - sizeof(*vb), | |
489 | mem, (long)sizeof(*mem)); | |
7a7d9a89 MCC |
490 | |
491 | return vb; | |
492 | } | |
493 | ||
037c75eb | 494 | static void *__videobuf_to_vaddr(struct videobuf_buffer *buf) |
59d34489 MCC |
495 | { |
496 | struct videobuf_dma_sg_memory *mem = buf->priv; | |
497 | BUG_ON(!mem); | |
498 | ||
499 | MAGIC_CHECK(mem->magic, MAGIC_SG_MEM); | |
500 | ||
bb6dbe74 | 501 | return mem->dma.vaddr; |
59d34489 MCC |
502 | } |
503 | ||
7a02264c PO |
504 | static int __videobuf_iolock(struct videobuf_queue *q, |
505 | struct videobuf_buffer *vb, | |
506 | struct v4l2_framebuffer *fbuf) | |
7a7d9a89 | 507 | { |
7a02264c | 508 | int err, pages; |
7a7d9a89 | 509 | dma_addr_t bus; |
0705135e | 510 | struct videobuf_dma_sg_memory *mem = vb->priv; |
7a7d9a89 MCC |
511 | BUG_ON(!mem); |
512 | ||
0705135e | 513 | MAGIC_CHECK(mem->magic, MAGIC_SG_MEM); |
7a7d9a89 | 514 | |
7b4eeed1 JH |
515 | if (!mem->dma.dev) |
516 | mem->dma.dev = q->dev; | |
517 | else | |
518 | WARN_ON(mem->dma.dev != q->dev); | |
519 | ||
7a7d9a89 MCC |
520 | switch (vb->memory) { |
521 | case V4L2_MEMORY_MMAP: | |
522 | case V4L2_MEMORY_USERPTR: | |
523 | if (0 == vb->baddr) { | |
524 | /* no userspace addr -- kernel bounce buffer */ | |
525 | pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT; | |
7a02264c PO |
526 | err = videobuf_dma_init_kernel(&mem->dma, |
527 | DMA_FROM_DEVICE, | |
528 | pages); | |
7a7d9a89 MCC |
529 | if (0 != err) |
530 | return err; | |
9900132f | 531 | } else if (vb->memory == V4L2_MEMORY_USERPTR) { |
7a7d9a89 | 532 | /* dma directly to userspace */ |
7a02264c PO |
533 | err = videobuf_dma_init_user(&mem->dma, |
534 | DMA_FROM_DEVICE, | |
535 | vb->baddr, vb->bsize); | |
7a7d9a89 MCC |
536 | if (0 != err) |
537 | return err; | |
9900132f ML |
538 | } else { |
539 | /* NOTE: HACK: videobuf_iolock on V4L2_MEMORY_MMAP | |
540 | buffers can only be called from videobuf_qbuf | |
541 | we take current->mm->mmap_sem there, to prevent | |
542 | locking inversion, so don't take it here */ | |
543 | ||
544 | err = videobuf_dma_init_user_locked(&mem->dma, | |
0705135e | 545 | DMA_FROM_DEVICE, |
9900132f ML |
546 | vb->baddr, vb->bsize); |
547 | if (0 != err) | |
548 | return err; | |
7a7d9a89 MCC |
549 | } |
550 | break; | |
551 | case V4L2_MEMORY_OVERLAY: | |
552 | if (NULL == fbuf) | |
553 | return -EINVAL; | |
554 | /* FIXME: need sanity checks for vb->boff */ | |
555 | /* | |
556 | * Using a double cast to avoid compiler warnings when | |
557 | * building for PAE. Compiler doesn't like direct casting | |
558 | * of a 32 bit ptr to 64 bit integer. | |
559 | */ | |
560 | bus = (dma_addr_t)(unsigned long)fbuf->base + vb->boff; | |
561 | pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT; | |
0705135e | 562 | err = videobuf_dma_init_overlay(&mem->dma, DMA_FROM_DEVICE, |
7a7d9a89 MCC |
563 | bus, pages); |
564 | if (0 != err) | |
565 | return err; | |
566 | break; | |
567 | default: | |
568 | BUG(); | |
569 | } | |
95268403 | 570 | err = videobuf_dma_map(q->dev, &mem->dma); |
7a7d9a89 MCC |
571 | if (0 != err) |
572 | return err; | |
573 | ||
574 | return 0; | |
575 | } | |
576 | ||
577 | static int __videobuf_sync(struct videobuf_queue *q, | |
578 | struct videobuf_buffer *buf) | |
579 | { | |
0705135e | 580 | struct videobuf_dma_sg_memory *mem = buf->priv; |
97f8105d MCC |
581 | BUG_ON(!mem || !mem->dma.sglen); |
582 | ||
7a02264c | 583 | MAGIC_CHECK(mem->magic, MAGIC_SG_MEM); |
97f8105d | 584 | MAGIC_CHECK(mem->dma.magic, MAGIC_DMABUF); |
7a7d9a89 | 585 | |
97f8105d | 586 | dma_sync_sg_for_cpu(q->dev, mem->dma.sglist, |
fc7f8fd4 | 587 | mem->dma.sglen, mem->dma.direction); |
97f8105d MCC |
588 | |
589 | return 0; | |
7a7d9a89 MCC |
590 | } |
591 | ||
7a7d9a89 | 592 | static int __videobuf_mmap_mapper(struct videobuf_queue *q, |
0b62b737 HV |
593 | struct videobuf_buffer *buf, |
594 | struct vm_area_struct *vma) | |
7a7d9a89 | 595 | { |
0b62b737 | 596 | struct videobuf_dma_sg_memory *mem = buf->priv; |
7a7d9a89 | 597 | struct videobuf_mapping *map; |
474675ad | 598 | unsigned int first, last, size = 0, i; |
7a7d9a89 MCC |
599 | int retval; |
600 | ||
601 | retval = -EINVAL; | |
7a7d9a89 | 602 | |
0b62b737 HV |
603 | BUG_ON(!mem); |
604 | MAGIC_CHECK(mem->magic, MAGIC_SG_MEM); | |
605 | ||
7a7d9a89 MCC |
606 | /* look for first buffer to map */ |
607 | for (first = 0; first < VIDEO_MAX_FRAME; first++) { | |
0b62b737 HV |
608 | if (buf == q->bufs[first]) { |
609 | size = PAGE_ALIGN(q->bufs[first]->bsize); | |
7a7d9a89 | 610 | break; |
0b62b737 | 611 | } |
7a7d9a89 | 612 | } |
0b62b737 HV |
613 | |
614 | /* paranoia, should never happen since buf is always valid. */ | |
474675ad | 615 | if (!size) { |
7a02264c | 616 | dprintk(1, "mmap app bug: offset invalid [offset=0x%lx]\n", |
0b62b737 | 617 | (vma->vm_pgoff << PAGE_SHIFT)); |
7a7d9a89 MCC |
618 | goto done; |
619 | } | |
620 | ||
0b62b737 | 621 | last = first; |
7a7d9a89 MCC |
622 | |
623 | /* create mapping + update buffer list */ | |
624 | retval = -ENOMEM; | |
7a02264c | 625 | map = kmalloc(sizeof(struct videobuf_mapping), GFP_KERNEL); |
7a7d9a89 MCC |
626 | if (NULL == map) |
627 | goto done; | |
ce54093c BP |
628 | |
629 | size = 0; | |
630 | for (i = first; i <= last; i++) { | |
631 | if (NULL == q->bufs[i]) | |
632 | continue; | |
851c0c96 | 633 | q->bufs[i]->map = map; |
7a7d9a89 | 634 | q->bufs[i]->baddr = vma->vm_start + size; |
7cbefad0 | 635 | size += PAGE_ALIGN(q->bufs[i]->bsize); |
7a7d9a89 | 636 | } |
ce54093c | 637 | |
7a7d9a89 | 638 | map->count = 1; |
7a7d9a89 MCC |
639 | map->q = q; |
640 | vma->vm_ops = &videobuf_vm_ops; | |
314e51b9 | 641 | vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; |
7a7d9a89 MCC |
642 | vma->vm_flags &= ~VM_IO; /* using shared anonymous pages */ |
643 | vma->vm_private_data = map; | |
7a02264c PO |
644 | dprintk(1, "mmap %p: q=%p %08lx-%08lx pgoff %08lx bufs %d-%d\n", |
645 | map, q, vma->vm_start, vma->vm_end, vma->vm_pgoff, first, last); | |
7a7d9a89 MCC |
646 | retval = 0; |
647 | ||
7a02264c | 648 | done: |
7a7d9a89 MCC |
649 | return retval; |
650 | } | |
651 | ||
0705135e | 652 | static struct videobuf_qtype_ops sg_ops = { |
7a7d9a89 MCC |
653 | .magic = MAGIC_QTYPE_OPS, |
654 | ||
33c38283 | 655 | .alloc_vb = __videobuf_alloc_vb, |
7a7d9a89 MCC |
656 | .iolock = __videobuf_iolock, |
657 | .sync = __videobuf_sync, | |
7a7d9a89 | 658 | .mmap_mapper = __videobuf_mmap_mapper, |
037c75eb | 659 | .vaddr = __videobuf_to_vaddr, |
7a7d9a89 MCC |
660 | }; |
661 | ||
0705135e | 662 | void *videobuf_sg_alloc(size_t size) |
7a7d9a89 MCC |
663 | { |
664 | struct videobuf_queue q; | |
665 | ||
666 | /* Required to make generic handler to call __videobuf_alloc */ | |
0705135e | 667 | q.int_ops = &sg_ops; |
7a7d9a89 | 668 | |
0705135e | 669 | q.msize = size; |
7a7d9a89 | 670 | |
33c38283 | 671 | return videobuf_alloc_vb(&q); |
7a7d9a89 | 672 | } |
7a02264c | 673 | EXPORT_SYMBOL_GPL(videobuf_sg_alloc); |
7a7d9a89 | 674 | |
7a02264c | 675 | void videobuf_queue_sg_init(struct videobuf_queue *q, |
38a54f35 | 676 | const struct videobuf_queue_ops *ops, |
0705135e | 677 | struct device *dev, |
7a7d9a89 MCC |
678 | spinlock_t *irqlock, |
679 | enum v4l2_buf_type type, | |
680 | enum v4l2_field field, | |
681 | unsigned int msize, | |
08bff03e HV |
682 | void *priv, |
683 | struct mutex *ext_lock) | |
7a7d9a89 | 684 | { |
d4cae5a5 | 685 | videobuf_queue_core_init(q, ops, dev, irqlock, type, field, msize, |
08bff03e | 686 | priv, &sg_ops, ext_lock); |
7a7d9a89 | 687 | } |
0705135e | 688 | EXPORT_SYMBOL_GPL(videobuf_queue_sg_init); |
7a7d9a89 | 689 |