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 | * | |
32590819 | 9 | * (c) 2007 Mauro Carvalho Chehab, <mchehab@kernel.org> |
7a7d9a89 MCC |
10 | * |
11 | * Highly based on video-buf written originally by: | |
12 | * (c) 2001,02 Gerd Knorr <kraxel@bytesex.org> | |
32590819 | 13 | * (c) 2006 Mauro Carvalho Chehab, <mchehab@kernel.org> |
7a7d9a89 MCC |
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> | |
589ee628 | 24 | #include <linux/sched/mm.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"); |
32590819 | 51 | MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@kernel.org>"); |
7a7d9a89 MCC |
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 | 147 | |
861360a5 | 148 | static void videobuf_dma_init(struct videobuf_dmabuf *dma) |
7a7d9a89 | 149 | { |
7a02264c | 150 | memset(dma, 0, sizeof(*dma)); |
7a7d9a89 MCC |
151 | dma->magic = MAGIC_DMABUF; |
152 | } | |
153 | ||
9900132f ML |
154 | static int videobuf_dma_init_user_locked(struct videobuf_dmabuf *dma, |
155 | int direction, unsigned long data, unsigned long size) | |
7a7d9a89 | 156 | { |
7a02264c | 157 | unsigned long first, last; |
7a7d9a89 | 158 | int err, rw = 0; |
768ae309 | 159 | unsigned int flags = FOLL_FORCE; |
7a7d9a89 MCC |
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; |
6da2ec56 KC |
178 | dma->pages = kmalloc_array(dma->nr_pages, sizeof(struct page *), |
179 | GFP_KERNEL); | |
7a7d9a89 MCC |
180 | if (NULL == dma->pages) |
181 | return -ENOMEM; | |
7a7d9a89 | 182 | |
768ae309 LS |
183 | if (rw == READ) |
184 | flags |= FOLL_WRITE; | |
185 | ||
7a02264c PO |
186 | dprintk(1, "init user [0x%lx+0x%lx => %d pages]\n", |
187 | data, size, dma->nr_pages); | |
188 | ||
b70131de | 189 | err = get_user_pages_longterm(data & PAGE_MASK, dma->nr_pages, |
768ae309 | 190 | flags, dma->pages, NULL); |
9900132f | 191 | |
7a7d9a89 MCC |
192 | if (err != dma->nr_pages) { |
193 | dma->nr_pages = (err >= 0) ? err : 0; | |
b70131de DW |
194 | dprintk(1, "get_user_pages_longterm: err=%d [%d]\n", err, |
195 | dma->nr_pages); | |
7a7d9a89 MCC |
196 | return err < 0 ? err : -EINVAL; |
197 | } | |
198 | return 0; | |
199 | } | |
200 | ||
861360a5 | 201 | static int videobuf_dma_init_user(struct videobuf_dmabuf *dma, int direction, |
9900132f ML |
202 | unsigned long data, unsigned long size) |
203 | { | |
204 | int ret; | |
7a02264c | 205 | |
9900132f ML |
206 | down_read(¤t->mm->mmap_sem); |
207 | ret = videobuf_dma_init_user_locked(dma, direction, data, size); | |
208 | up_read(¤t->mm->mmap_sem); | |
209 | ||
210 | return ret; | |
211 | } | |
212 | ||
861360a5 | 213 | static int videobuf_dma_init_kernel(struct videobuf_dmabuf *dma, int direction, |
7a7d9a89 MCC |
214 | int nr_pages) |
215 | { | |
7b4eeed1 JH |
216 | int i; |
217 | ||
7a02264c PO |
218 | dprintk(1, "init kernel [%d pages]\n", nr_pages); |
219 | ||
7a7d9a89 | 220 | dma->direction = direction; |
7b4eeed1 JH |
221 | dma->vaddr_pages = kcalloc(nr_pages, sizeof(*dma->vaddr_pages), |
222 | GFP_KERNEL); | |
223 | if (!dma->vaddr_pages) | |
224 | return -ENOMEM; | |
225 | ||
226 | dma->dma_addr = kcalloc(nr_pages, sizeof(*dma->dma_addr), GFP_KERNEL); | |
227 | if (!dma->dma_addr) { | |
228 | kfree(dma->vaddr_pages); | |
229 | return -ENOMEM; | |
230 | } | |
231 | for (i = 0; i < nr_pages; i++) { | |
232 | void *addr; | |
233 | ||
234 | addr = dma_alloc_coherent(dma->dev, PAGE_SIZE, | |
235 | &(dma->dma_addr[i]), GFP_KERNEL); | |
236 | if (addr == NULL) | |
237 | goto out_free_pages; | |
238 | ||
239 | dma->vaddr_pages[i] = virt_to_page(addr); | |
240 | } | |
241 | dma->vaddr = vmap(dma->vaddr_pages, nr_pages, VM_MAP | VM_IOREMAP, | |
242 | PAGE_KERNEL); | |
bb6dbe74 | 243 | if (NULL == dma->vaddr) { |
7a02264c | 244 | dprintk(1, "vmalloc_32(%d pages) failed\n", nr_pages); |
7b4eeed1 | 245 | goto out_free_pages; |
7a7d9a89 | 246 | } |
7a02264c | 247 | |
b1a5dea6 MCC |
248 | dprintk(1, "vmalloc is at addr %p, size=%d\n", |
249 | dma->vaddr, nr_pages << PAGE_SHIFT); | |
7a02264c | 250 | |
bb6dbe74 | 251 | memset(dma->vaddr, 0, nr_pages << PAGE_SHIFT); |
7a7d9a89 | 252 | dma->nr_pages = nr_pages; |
7a02264c | 253 | |
7a7d9a89 | 254 | return 0; |
7b4eeed1 JH |
255 | out_free_pages: |
256 | while (i > 0) { | |
23d3090f DC |
257 | void *addr; |
258 | ||
7b4eeed1 | 259 | i--; |
23d3090f DC |
260 | addr = page_address(dma->vaddr_pages[i]); |
261 | dma_free_coherent(dma->dev, PAGE_SIZE, addr, dma->dma_addr[i]); | |
7b4eeed1 JH |
262 | } |
263 | kfree(dma->dma_addr); | |
264 | dma->dma_addr = NULL; | |
265 | kfree(dma->vaddr_pages); | |
266 | dma->vaddr_pages = NULL; | |
267 | ||
268 | return -ENOMEM; | |
269 | ||
7a7d9a89 MCC |
270 | } |
271 | ||
861360a5 | 272 | static int videobuf_dma_init_overlay(struct videobuf_dmabuf *dma, int direction, |
7a7d9a89 MCC |
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 | } | |
287 | ||
861360a5 | 288 | static int videobuf_dma_map(struct device *dev, struct videobuf_dmabuf *dma) |
7a7d9a89 | 289 | { |
7a02264c | 290 | MAGIC_CHECK(dma->magic, MAGIC_DMABUF); |
7a7d9a89 MCC |
291 | BUG_ON(0 == dma->nr_pages); |
292 | ||
293 | if (dma->pages) { | |
294 | dma->sglist = videobuf_pages_to_sg(dma->pages, dma->nr_pages, | |
2fc11536 | 295 | dma->offset, dma->size); |
7a7d9a89 | 296 | } |
bb6dbe74 LP |
297 | if (dma->vaddr) { |
298 | dma->sglist = videobuf_vmalloc_to_sg(dma->vaddr, | |
7a02264c | 299 | dma->nr_pages); |
7a7d9a89 MCC |
300 | } |
301 | if (dma->bus_addr) { | |
1010ed13 | 302 | dma->sglist = vmalloc(sizeof(*dma->sglist)); |
7a7d9a89 | 303 | if (NULL != dma->sglist) { |
7a02264c PO |
304 | dma->sglen = 1; |
305 | sg_dma_address(&dma->sglist[0]) = dma->bus_addr | |
306 | & PAGE_MASK; | |
307 | dma->sglist[0].offset = dma->bus_addr & ~PAGE_MASK; | |
308 | sg_dma_len(&dma->sglist[0]) = dma->nr_pages * PAGE_SIZE; | |
7a7d9a89 MCC |
309 | } |
310 | } | |
311 | if (NULL == dma->sglist) { | |
7a02264c | 312 | dprintk(1, "scatterlist is NULL\n"); |
7a7d9a89 MCC |
313 | return -ENOMEM; |
314 | } | |
315 | if (!dma->bus_addr) { | |
95268403 | 316 | dma->sglen = dma_map_sg(dev, dma->sglist, |
7a7d9a89 | 317 | dma->nr_pages, dma->direction); |
7a7d9a89 MCC |
318 | if (0 == dma->sglen) { |
319 | printk(KERN_WARNING | |
7a02264c | 320 | "%s: videobuf_map_sg failed\n", __func__); |
1010ed13 | 321 | vfree(dma->sglist); |
7a7d9a89 MCC |
322 | dma->sglist = NULL; |
323 | dma->sglen = 0; | |
92051b28 | 324 | return -ENOMEM; |
7a7d9a89 MCC |
325 | } |
326 | } | |
7a02264c | 327 | |
7a7d9a89 MCC |
328 | return 0; |
329 | } | |
330 | ||
95268403 | 331 | int videobuf_dma_unmap(struct device *dev, struct videobuf_dmabuf *dma) |
7a7d9a89 | 332 | { |
0705135e | 333 | MAGIC_CHECK(dma->magic, MAGIC_DMABUF); |
7a02264c | 334 | |
7a7d9a89 MCC |
335 | if (!dma->sglen) |
336 | return 0; | |
337 | ||
4573027b | 338 | dma_unmap_sg(dev, dma->sglist, dma->nr_pages, dma->direction); |
5ddff434 | 339 | |
1010ed13 | 340 | vfree(dma->sglist); |
7a7d9a89 MCC |
341 | dma->sglist = NULL; |
342 | dma->sglen = 0; | |
7a02264c | 343 | |
7a7d9a89 MCC |
344 | return 0; |
345 | } | |
7a02264c | 346 | EXPORT_SYMBOL_GPL(videobuf_dma_unmap); |
7a7d9a89 MCC |
347 | |
348 | int videobuf_dma_free(struct videobuf_dmabuf *dma) | |
349 | { | |
7a02264c PO |
350 | int i; |
351 | MAGIC_CHECK(dma->magic, MAGIC_DMABUF); | |
7a7d9a89 MCC |
352 | BUG_ON(dma->sglen); |
353 | ||
354 | if (dma->pages) { | |
7a02264c | 355 | for (i = 0; i < dma->nr_pages; i++) |
09cbfeaf | 356 | put_page(dma->pages[i]); |
7a7d9a89 MCC |
357 | kfree(dma->pages); |
358 | dma->pages = NULL; | |
359 | } | |
360 | ||
7b4eeed1 JH |
361 | if (dma->dma_addr) { |
362 | for (i = 0; i < dma->nr_pages; i++) { | |
363 | void *addr; | |
364 | ||
365 | addr = page_address(dma->vaddr_pages[i]); | |
366 | dma_free_coherent(dma->dev, PAGE_SIZE, addr, | |
367 | dma->dma_addr[i]); | |
368 | } | |
369 | kfree(dma->dma_addr); | |
370 | dma->dma_addr = NULL; | |
371 | kfree(dma->vaddr_pages); | |
372 | dma->vaddr_pages = NULL; | |
373 | vunmap(dma->vaddr); | |
374 | dma->vaddr = NULL; | |
375 | } | |
7a7d9a89 | 376 | |
7a02264c | 377 | if (dma->bus_addr) |
7a7d9a89 | 378 | dma->bus_addr = 0; |
0705135e | 379 | dma->direction = DMA_NONE; |
7a02264c | 380 | |
7a7d9a89 MCC |
381 | return 0; |
382 | } | |
7a02264c | 383 | EXPORT_SYMBOL_GPL(videobuf_dma_free); |
7a7d9a89 MCC |
384 | |
385 | /* --------------------------------------------------------------------- */ | |
386 | ||
7a02264c | 387 | static void videobuf_vm_open(struct vm_area_struct *vma) |
7a7d9a89 MCC |
388 | { |
389 | struct videobuf_mapping *map = vma->vm_private_data; | |
390 | ||
7a02264c PO |
391 | dprintk(2, "vm_open %p [count=%d,vma=%08lx-%08lx]\n", map, |
392 | map->count, vma->vm_start, vma->vm_end); | |
393 | ||
7a7d9a89 MCC |
394 | map->count++; |
395 | } | |
396 | ||
7a02264c | 397 | static void videobuf_vm_close(struct vm_area_struct *vma) |
7a7d9a89 MCC |
398 | { |
399 | struct videobuf_mapping *map = vma->vm_private_data; | |
400 | struct videobuf_queue *q = map->q; | |
0705135e | 401 | struct videobuf_dma_sg_memory *mem; |
7a7d9a89 MCC |
402 | int i; |
403 | ||
7a02264c PO |
404 | dprintk(2, "vm_close %p [count=%d,vma=%08lx-%08lx]\n", map, |
405 | map->count, vma->vm_start, vma->vm_end); | |
7a7d9a89 | 406 | |
cca36e2e HV |
407 | map->count--; |
408 | if (0 == map->count) { | |
7a02264c | 409 | dprintk(1, "munmap %p q=%p\n", map, q); |
cca36e2e | 410 | videobuf_queue_lock(q); |
7a7d9a89 MCC |
411 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { |
412 | if (NULL == q->bufs[i]) | |
413 | continue; | |
7a02264c | 414 | mem = q->bufs[i]->priv; |
7a7d9a89 MCC |
415 | if (!mem) |
416 | continue; | |
417 | ||
7a02264c | 418 | MAGIC_CHECK(mem->magic, MAGIC_SG_MEM); |
7a7d9a89 | 419 | |
851c0c96 | 420 | if (q->bufs[i]->map != map) |
7a7d9a89 | 421 | continue; |
851c0c96 | 422 | q->bufs[i]->map = NULL; |
7a7d9a89 | 423 | q->bufs[i]->baddr = 0; |
7a02264c | 424 | q->ops->buf_release(q, q->bufs[i]); |
7a7d9a89 | 425 | } |
cca36e2e | 426 | videobuf_queue_unlock(q); |
7a7d9a89 MCC |
427 | kfree(map); |
428 | } | |
429 | return; | |
430 | } | |
431 | ||
432 | /* | |
433 | * Get a anonymous page for the mapping. Make sure we can DMA to that | |
434 | * memory location with 32bit PCI devices (i.e. don't use highmem for | |
435 | * now ...). Bounce buffers don't work very well for the data rates | |
436 | * video capture has. | |
437 | */ | |
62d4cfd3 | 438 | static vm_fault_t videobuf_vm_fault(struct vm_fault *vmf) |
7a7d9a89 | 439 | { |
11bac800 | 440 | struct vm_area_struct *vma = vmf->vma; |
7a7d9a89 MCC |
441 | struct page *page; |
442 | ||
7a02264c | 443 | dprintk(3, "fault: fault @ %08lx [vma %08lx-%08lx]\n", |
1a29d85e | 444 | vmf->address, vma->vm_start, vma->vm_end); |
7a02264c | 445 | |
7a7d9a89 MCC |
446 | page = alloc_page(GFP_USER | __GFP_DMA32); |
447 | if (!page) | |
105354a0 | 448 | return VM_FAULT_OOM; |
1a29d85e | 449 | clear_user_highpage(page, vmf->address); |
105354a0 | 450 | vmf->page = page; |
7a02264c | 451 | |
105354a0 | 452 | return 0; |
7a7d9a89 MCC |
453 | } |
454 | ||
7a02264c PO |
455 | static const struct vm_operations_struct videobuf_vm_ops = { |
456 | .open = videobuf_vm_open, | |
457 | .close = videobuf_vm_close, | |
458 | .fault = videobuf_vm_fault, | |
7a7d9a89 MCC |
459 | }; |
460 | ||
461 | /* --------------------------------------------------------------------- | |
0705135e | 462 | * SG handlers for the generic methods |
7a7d9a89 MCC |
463 | */ |
464 | ||
465 | /* Allocated area consists on 3 parts: | |
466 | struct video_buffer | |
467 | struct <driver>_buffer (cx88_buffer, saa7134_buf, ...) | |
0705135e | 468 | struct videobuf_dma_sg_memory |
7a7d9a89 MCC |
469 | */ |
470 | ||
33c38283 | 471 | static struct videobuf_buffer *__videobuf_alloc_vb(size_t size) |
7a7d9a89 | 472 | { |
0705135e | 473 | struct videobuf_dma_sg_memory *mem; |
7a7d9a89 MCC |
474 | struct videobuf_buffer *vb; |
475 | ||
7a02264c | 476 | vb = kzalloc(size + sizeof(*mem), GFP_KERNEL); |
bee527f9 PO |
477 | if (!vb) |
478 | return vb; | |
7a7d9a89 | 479 | |
7a02264c PO |
480 | mem = vb->priv = ((char *)vb) + size; |
481 | mem->magic = MAGIC_SG_MEM; | |
7a7d9a89 MCC |
482 | |
483 | videobuf_dma_init(&mem->dma); | |
484 | ||
7a02264c PO |
485 | dprintk(1, "%s: allocated at %p(%ld+%ld) & %p(%ld)\n", |
486 | __func__, vb, (long)sizeof(*vb), (long)size - sizeof(*vb), | |
487 | mem, (long)sizeof(*mem)); | |
7a7d9a89 MCC |
488 | |
489 | return vb; | |
490 | } | |
491 | ||
037c75eb | 492 | static void *__videobuf_to_vaddr(struct videobuf_buffer *buf) |
59d34489 MCC |
493 | { |
494 | struct videobuf_dma_sg_memory *mem = buf->priv; | |
495 | BUG_ON(!mem); | |
496 | ||
497 | MAGIC_CHECK(mem->magic, MAGIC_SG_MEM); | |
498 | ||
bb6dbe74 | 499 | return mem->dma.vaddr; |
59d34489 MCC |
500 | } |
501 | ||
7a02264c PO |
502 | static int __videobuf_iolock(struct videobuf_queue *q, |
503 | struct videobuf_buffer *vb, | |
504 | struct v4l2_framebuffer *fbuf) | |
7a7d9a89 | 505 | { |
7a02264c | 506 | int err, pages; |
7a7d9a89 | 507 | dma_addr_t bus; |
0705135e | 508 | struct videobuf_dma_sg_memory *mem = vb->priv; |
7a7d9a89 MCC |
509 | BUG_ON(!mem); |
510 | ||
0705135e | 511 | MAGIC_CHECK(mem->magic, MAGIC_SG_MEM); |
7a7d9a89 | 512 | |
7b4eeed1 JH |
513 | if (!mem->dma.dev) |
514 | mem->dma.dev = q->dev; | |
515 | else | |
516 | WARN_ON(mem->dma.dev != q->dev); | |
517 | ||
7a7d9a89 MCC |
518 | switch (vb->memory) { |
519 | case V4L2_MEMORY_MMAP: | |
520 | case V4L2_MEMORY_USERPTR: | |
521 | if (0 == vb->baddr) { | |
522 | /* no userspace addr -- kernel bounce buffer */ | |
523 | pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT; | |
7a02264c PO |
524 | err = videobuf_dma_init_kernel(&mem->dma, |
525 | DMA_FROM_DEVICE, | |
526 | pages); | |
7a7d9a89 MCC |
527 | if (0 != err) |
528 | return err; | |
9900132f | 529 | } else if (vb->memory == V4L2_MEMORY_USERPTR) { |
7a7d9a89 | 530 | /* dma directly to userspace */ |
7a02264c PO |
531 | err = videobuf_dma_init_user(&mem->dma, |
532 | DMA_FROM_DEVICE, | |
533 | vb->baddr, vb->bsize); | |
7a7d9a89 MCC |
534 | if (0 != err) |
535 | return err; | |
9900132f ML |
536 | } else { |
537 | /* NOTE: HACK: videobuf_iolock on V4L2_MEMORY_MMAP | |
538 | buffers can only be called from videobuf_qbuf | |
539 | we take current->mm->mmap_sem there, to prevent | |
540 | locking inversion, so don't take it here */ | |
541 | ||
542 | err = videobuf_dma_init_user_locked(&mem->dma, | |
0705135e | 543 | DMA_FROM_DEVICE, |
9900132f ML |
544 | vb->baddr, vb->bsize); |
545 | if (0 != err) | |
546 | return err; | |
7a7d9a89 MCC |
547 | } |
548 | break; | |
549 | case V4L2_MEMORY_OVERLAY: | |
550 | if (NULL == fbuf) | |
551 | return -EINVAL; | |
552 | /* FIXME: need sanity checks for vb->boff */ | |
553 | /* | |
554 | * Using a double cast to avoid compiler warnings when | |
555 | * building for PAE. Compiler doesn't like direct casting | |
556 | * of a 32 bit ptr to 64 bit integer. | |
557 | */ | |
558 | bus = (dma_addr_t)(unsigned long)fbuf->base + vb->boff; | |
559 | pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT; | |
0705135e | 560 | err = videobuf_dma_init_overlay(&mem->dma, DMA_FROM_DEVICE, |
7a7d9a89 MCC |
561 | bus, pages); |
562 | if (0 != err) | |
563 | return err; | |
564 | break; | |
565 | default: | |
566 | BUG(); | |
567 | } | |
95268403 | 568 | err = videobuf_dma_map(q->dev, &mem->dma); |
7a7d9a89 MCC |
569 | if (0 != err) |
570 | return err; | |
571 | ||
572 | return 0; | |
573 | } | |
574 | ||
575 | static int __videobuf_sync(struct videobuf_queue *q, | |
576 | struct videobuf_buffer *buf) | |
577 | { | |
0705135e | 578 | struct videobuf_dma_sg_memory *mem = buf->priv; |
97f8105d MCC |
579 | BUG_ON(!mem || !mem->dma.sglen); |
580 | ||
7a02264c | 581 | MAGIC_CHECK(mem->magic, MAGIC_SG_MEM); |
97f8105d | 582 | MAGIC_CHECK(mem->dma.magic, MAGIC_DMABUF); |
7a7d9a89 | 583 | |
97f8105d | 584 | dma_sync_sg_for_cpu(q->dev, mem->dma.sglist, |
4573027b | 585 | mem->dma.nr_pages, mem->dma.direction); |
97f8105d MCC |
586 | |
587 | return 0; | |
7a7d9a89 MCC |
588 | } |
589 | ||
7a7d9a89 | 590 | static int __videobuf_mmap_mapper(struct videobuf_queue *q, |
0b62b737 HV |
591 | struct videobuf_buffer *buf, |
592 | struct vm_area_struct *vma) | |
7a7d9a89 | 593 | { |
0b62b737 | 594 | struct videobuf_dma_sg_memory *mem = buf->priv; |
7a7d9a89 | 595 | struct videobuf_mapping *map; |
474675ad | 596 | unsigned int first, last, size = 0, i; |
7a7d9a89 MCC |
597 | int retval; |
598 | ||
599 | retval = -EINVAL; | |
7a7d9a89 | 600 | |
0b62b737 HV |
601 | BUG_ON(!mem); |
602 | MAGIC_CHECK(mem->magic, MAGIC_SG_MEM); | |
603 | ||
7a7d9a89 MCC |
604 | /* look for first buffer to map */ |
605 | for (first = 0; first < VIDEO_MAX_FRAME; first++) { | |
0b62b737 HV |
606 | if (buf == q->bufs[first]) { |
607 | size = PAGE_ALIGN(q->bufs[first]->bsize); | |
7a7d9a89 | 608 | break; |
0b62b737 | 609 | } |
7a7d9a89 | 610 | } |
0b62b737 HV |
611 | |
612 | /* paranoia, should never happen since buf is always valid. */ | |
474675ad | 613 | if (!size) { |
7a02264c | 614 | dprintk(1, "mmap app bug: offset invalid [offset=0x%lx]\n", |
0b62b737 | 615 | (vma->vm_pgoff << PAGE_SHIFT)); |
7a7d9a89 MCC |
616 | goto done; |
617 | } | |
618 | ||
0b62b737 | 619 | last = first; |
7a7d9a89 MCC |
620 | |
621 | /* create mapping + update buffer list */ | |
622 | retval = -ENOMEM; | |
7a02264c | 623 | map = kmalloc(sizeof(struct videobuf_mapping), GFP_KERNEL); |
7a7d9a89 MCC |
624 | if (NULL == map) |
625 | goto done; | |
ce54093c BP |
626 | |
627 | size = 0; | |
628 | for (i = first; i <= last; i++) { | |
629 | if (NULL == q->bufs[i]) | |
630 | continue; | |
851c0c96 | 631 | q->bufs[i]->map = map; |
7a7d9a89 | 632 | q->bufs[i]->baddr = vma->vm_start + size; |
7cbefad0 | 633 | size += PAGE_ALIGN(q->bufs[i]->bsize); |
7a7d9a89 | 634 | } |
ce54093c | 635 | |
7a7d9a89 | 636 | map->count = 1; |
7a7d9a89 MCC |
637 | map->q = q; |
638 | vma->vm_ops = &videobuf_vm_ops; | |
314e51b9 | 639 | vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; |
7a7d9a89 MCC |
640 | vma->vm_flags &= ~VM_IO; /* using shared anonymous pages */ |
641 | vma->vm_private_data = map; | |
7a02264c PO |
642 | dprintk(1, "mmap %p: q=%p %08lx-%08lx pgoff %08lx bufs %d-%d\n", |
643 | map, q, vma->vm_start, vma->vm_end, vma->vm_pgoff, first, last); | |
7a7d9a89 MCC |
644 | retval = 0; |
645 | ||
7a02264c | 646 | done: |
7a7d9a89 MCC |
647 | return retval; |
648 | } | |
649 | ||
0705135e | 650 | static struct videobuf_qtype_ops sg_ops = { |
7a7d9a89 MCC |
651 | .magic = MAGIC_QTYPE_OPS, |
652 | ||
33c38283 | 653 | .alloc_vb = __videobuf_alloc_vb, |
7a7d9a89 MCC |
654 | .iolock = __videobuf_iolock, |
655 | .sync = __videobuf_sync, | |
7a7d9a89 | 656 | .mmap_mapper = __videobuf_mmap_mapper, |
037c75eb | 657 | .vaddr = __videobuf_to_vaddr, |
7a7d9a89 MCC |
658 | }; |
659 | ||
0705135e | 660 | void *videobuf_sg_alloc(size_t size) |
7a7d9a89 MCC |
661 | { |
662 | struct videobuf_queue q; | |
663 | ||
664 | /* Required to make generic handler to call __videobuf_alloc */ | |
0705135e | 665 | q.int_ops = &sg_ops; |
7a7d9a89 | 666 | |
0705135e | 667 | q.msize = size; |
7a7d9a89 | 668 | |
33c38283 | 669 | return videobuf_alloc_vb(&q); |
7a7d9a89 | 670 | } |
7a02264c | 671 | EXPORT_SYMBOL_GPL(videobuf_sg_alloc); |
7a7d9a89 | 672 | |
7a02264c | 673 | void videobuf_queue_sg_init(struct videobuf_queue *q, |
38a54f35 | 674 | const struct videobuf_queue_ops *ops, |
0705135e | 675 | struct device *dev, |
7a7d9a89 MCC |
676 | spinlock_t *irqlock, |
677 | enum v4l2_buf_type type, | |
678 | enum v4l2_field field, | |
679 | unsigned int msize, | |
08bff03e HV |
680 | void *priv, |
681 | struct mutex *ext_lock) | |
7a7d9a89 | 682 | { |
d4cae5a5 | 683 | videobuf_queue_core_init(q, ops, dev, irqlock, type, field, msize, |
08bff03e | 684 | priv, &sg_ops, ext_lock); |
7a7d9a89 | 685 | } |
0705135e | 686 | EXPORT_SYMBOL_GPL(videobuf_queue_sg_init); |
7a7d9a89 | 687 |