Commit | Line | Data |
---|---|---|
77512baa | 1 | // SPDX-License-Identifier: GPL-2.0-only |
7a7d9a89 | 2 | /* |
0705135e | 3 | * helper functions for SG DMA video4linux capture buffers |
7a7d9a89 | 4 | * |
5d6aaf50 | 5 | * The functions expect the hardware being able to scatter gather |
7a7d9a89 MCC |
6 | * (i.e. the buffers are not linear in physical memory, but fragmented |
7 | * into PAGE_SIZE chunks). They also assume the driver does not need | |
8 | * to touch the video data. | |
9 | * | |
32590819 | 10 | * (c) 2007 Mauro Carvalho Chehab, <mchehab@kernel.org> |
7a7d9a89 MCC |
11 | * |
12 | * Highly based on video-buf written originally by: | |
13 | * (c) 2001,02 Gerd Knorr <kraxel@bytesex.org> | |
32590819 | 14 | * (c) 2006 Mauro Carvalho Chehab, <mchehab@kernel.org> |
7a7d9a89 | 15 | * (c) 2006 Ted Walther and John Sokol |
7a7d9a89 MCC |
16 | */ |
17 | ||
18 | #include <linux/init.h> | |
19 | #include <linux/module.h> | |
20 | #include <linux/moduleparam.h> | |
589ee628 | 21 | #include <linux/sched/mm.h> |
7a7d9a89 MCC |
22 | #include <linux/slab.h> |
23 | #include <linux/interrupt.h> | |
65fddcfc | 24 | #include <linux/pgtable.h> |
7a7d9a89 | 25 | |
0705135e | 26 | #include <linux/dma-mapping.h> |
7a7d9a89 MCC |
27 | #include <linux/vmalloc.h> |
28 | #include <linux/pagemap.h> | |
11763609 | 29 | #include <linux/scatterlist.h> |
7a7d9a89 | 30 | #include <asm/page.h> |
7a7d9a89 MCC |
31 | |
32 | #include <media/videobuf-dma-sg.h> | |
33 | ||
34 | #define MAGIC_DMABUF 0x19721112 | |
35 | #define MAGIC_SG_MEM 0x17890714 | |
36 | ||
7a02264c PO |
37 | #define MAGIC_CHECK(is, should) \ |
38 | if (unlikely((is) != (should))) { \ | |
39 | printk(KERN_ERR "magic mismatch: %x (expected %x)\n", \ | |
40 | is, should); \ | |
41 | BUG(); \ | |
42 | } | |
7a7d9a89 | 43 | |
ff699e6b | 44 | static int debug; |
7a7d9a89 MCC |
45 | module_param(debug, int, 0644); |
46 | ||
0705135e | 47 | MODULE_DESCRIPTION("helper module to manage video4linux dma sg buffers"); |
32590819 | 48 | MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@kernel.org>"); |
7a7d9a89 MCC |
49 | MODULE_LICENSE("GPL"); |
50 | ||
7a02264c PO |
51 | #define dprintk(level, fmt, arg...) \ |
52 | if (debug >= level) \ | |
53 | printk(KERN_DEBUG "vbuf-sg: " fmt , ## arg) | |
7a7d9a89 MCC |
54 | |
55 | /* --------------------------------------------------------------------- */ | |
56 | ||
7181772d LP |
57 | /* |
58 | * Return a scatterlist for some page-aligned vmalloc()'ed memory | |
59 | * block (NULL on errors). Memory for the scatterlist is allocated | |
60 | * using kmalloc. The caller must free the memory. | |
61 | */ | |
62 | static struct scatterlist *videobuf_vmalloc_to_sg(unsigned char *virt, | |
63 | int nr_pages) | |
7a7d9a89 MCC |
64 | { |
65 | struct scatterlist *sglist; | |
66 | struct page *pg; | |
67 | int i; | |
68 | ||
fad953ce | 69 | sglist = vzalloc(array_size(nr_pages, sizeof(*sglist))); |
7a7d9a89 MCC |
70 | if (NULL == sglist) |
71 | return NULL; | |
45711f1a | 72 | sg_init_table(sglist, nr_pages); |
7a7d9a89 MCC |
73 | for (i = 0; i < nr_pages; i++, virt += PAGE_SIZE) { |
74 | pg = vmalloc_to_page(virt); | |
75 | if (NULL == pg) | |
76 | goto err; | |
77 | BUG_ON(PageHighMem(pg)); | |
642f1490 | 78 | sg_set_page(&sglist[i], pg, PAGE_SIZE, 0); |
7a7d9a89 MCC |
79 | } |
80 | return sglist; | |
81 | ||
7a02264c | 82 | err: |
1010ed13 | 83 | vfree(sglist); |
7a7d9a89 MCC |
84 | return NULL; |
85 | } | |
86 | ||
7181772d LP |
87 | /* |
88 | * Return a scatterlist for a an array of userpages (NULL on errors). | |
89 | * Memory for the scatterlist is allocated using kmalloc. The caller | |
90 | * must free the memory. | |
91 | */ | |
92 | static struct scatterlist *videobuf_pages_to_sg(struct page **pages, | |
2fc11536 | 93 | int nr_pages, int offset, size_t size) |
7a7d9a89 MCC |
94 | { |
95 | struct scatterlist *sglist; | |
a47cacbd | 96 | int i; |
7a7d9a89 MCC |
97 | |
98 | if (NULL == pages[0]) | |
99 | return NULL; | |
42bc47b3 | 100 | sglist = vmalloc(array_size(nr_pages, sizeof(*sglist))); |
7a7d9a89 MCC |
101 | if (NULL == sglist) |
102 | return NULL; | |
45711f1a | 103 | sg_init_table(sglist, nr_pages); |
7a7d9a89 | 104 | |
7a7d9a89 MCC |
105 | if (PageHighMem(pages[0])) |
106 | /* DMA to highmem pages might not work */ | |
107 | goto highmem; | |
45f239ab NE |
108 | sg_set_page(&sglist[0], pages[0], |
109 | min_t(size_t, PAGE_SIZE - offset, size), offset); | |
110 | size -= min_t(size_t, PAGE_SIZE - offset, size); | |
7a7d9a89 MCC |
111 | for (i = 1; i < nr_pages; i++) { |
112 | if (NULL == pages[i]) | |
113 | goto nopage; | |
114 | if (PageHighMem(pages[i])) | |
115 | goto highmem; | |
1bede752 MCC |
116 | sg_set_page(&sglist[i], pages[i], min_t(size_t, PAGE_SIZE, size), 0); |
117 | size -= min_t(size_t, PAGE_SIZE, size); | |
7a7d9a89 MCC |
118 | } |
119 | return sglist; | |
120 | ||
7a02264c PO |
121 | nopage: |
122 | dprintk(2, "sgl: oops - no page\n"); | |
1010ed13 | 123 | vfree(sglist); |
7a7d9a89 MCC |
124 | return NULL; |
125 | ||
7a02264c PO |
126 | highmem: |
127 | dprintk(2, "sgl: oops - highmem page\n"); | |
1010ed13 | 128 | vfree(sglist); |
7a7d9a89 MCC |
129 | return NULL; |
130 | } | |
131 | ||
132 | /* --------------------------------------------------------------------- */ | |
133 | ||
7a02264c | 134 | struct videobuf_dmabuf *videobuf_to_dma(struct videobuf_buffer *buf) |
7a7d9a89 | 135 | { |
0705135e GL |
136 | struct videobuf_dma_sg_memory *mem = buf->priv; |
137 | BUG_ON(!mem); | |
7a7d9a89 | 138 | |
0705135e | 139 | MAGIC_CHECK(mem->magic, MAGIC_SG_MEM); |
7a7d9a89 MCC |
140 | |
141 | return &mem->dma; | |
142 | } | |
7a02264c | 143 | EXPORT_SYMBOL_GPL(videobuf_to_dma); |
7a7d9a89 | 144 | |
861360a5 | 145 | static void videobuf_dma_init(struct videobuf_dmabuf *dma) |
7a7d9a89 | 146 | { |
7a02264c | 147 | memset(dma, 0, sizeof(*dma)); |
7a7d9a89 MCC |
148 | dma->magic = MAGIC_DMABUF; |
149 | } | |
150 | ||
9900132f ML |
151 | static int videobuf_dma_init_user_locked(struct videobuf_dmabuf *dma, |
152 | int direction, unsigned long data, unsigned long size) | |
7a7d9a89 | 153 | { |
3298de2c | 154 | unsigned int gup_flags = FOLL_LONGTERM; |
7a02264c | 155 | unsigned long first, last; |
3298de2c | 156 | int err; |
7a7d9a89 MCC |
157 | |
158 | dma->direction = direction; | |
159 | switch (dma->direction) { | |
0705135e | 160 | case DMA_FROM_DEVICE: |
3298de2c | 161 | gup_flags |= FOLL_WRITE; |
0705135e GL |
162 | break; |
163 | case DMA_TO_DEVICE: | |
0705135e GL |
164 | break; |
165 | default: | |
166 | BUG(); | |
7a7d9a89 MCC |
167 | } |
168 | ||
169 | first = (data & PAGE_MASK) >> PAGE_SHIFT; | |
170 | last = ((data+size-1) & PAGE_MASK) >> PAGE_SHIFT; | |
2fc11536 HV |
171 | dma->offset = data & ~PAGE_MASK; |
172 | dma->size = size; | |
7a7d9a89 | 173 | dma->nr_pages = last-first+1; |
6da2ec56 KC |
174 | dma->pages = kmalloc_array(dma->nr_pages, sizeof(struct page *), |
175 | GFP_KERNEL); | |
7a7d9a89 MCC |
176 | if (NULL == dma->pages) |
177 | return -ENOMEM; | |
7a7d9a89 | 178 | |
1faa39e0 | 179 | dprintk(1, "init user [0x%lx+0x%lx => %lu pages]\n", |
7a02264c PO |
180 | data, size, dma->nr_pages); |
181 | ||
3298de2c DH |
182 | err = pin_user_pages(data & PAGE_MASK, dma->nr_pages, gup_flags, |
183 | dma->pages, NULL); | |
9900132f | 184 | |
7a7d9a89 MCC |
185 | if (err != dma->nr_pages) { |
186 | dma->nr_pages = (err >= 0) ? err : 0; | |
1faa39e0 | 187 | dprintk(1, "pin_user_pages: err=%d [%lu]\n", err, |
b70131de | 188 | dma->nr_pages); |
7a7d9a89 MCC |
189 | return err < 0 ? err : -EINVAL; |
190 | } | |
191 | return 0; | |
192 | } | |
193 | ||
861360a5 | 194 | static int videobuf_dma_init_user(struct videobuf_dmabuf *dma, int direction, |
9900132f ML |
195 | unsigned long data, unsigned long size) |
196 | { | |
197 | int ret; | |
7a02264c | 198 | |
d8ed45c5 | 199 | mmap_read_lock(current->mm); |
9900132f | 200 | ret = videobuf_dma_init_user_locked(dma, direction, data, size); |
d8ed45c5 | 201 | mmap_read_unlock(current->mm); |
9900132f ML |
202 | |
203 | return ret; | |
204 | } | |
205 | ||
861360a5 | 206 | static int videobuf_dma_init_kernel(struct videobuf_dmabuf *dma, int direction, |
1faa39e0 | 207 | unsigned long nr_pages) |
7a7d9a89 | 208 | { |
7b4eeed1 JH |
209 | int i; |
210 | ||
1faa39e0 | 211 | dprintk(1, "init kernel [%lu pages]\n", nr_pages); |
7a02264c | 212 | |
7a7d9a89 | 213 | dma->direction = direction; |
7b4eeed1 JH |
214 | dma->vaddr_pages = kcalloc(nr_pages, sizeof(*dma->vaddr_pages), |
215 | GFP_KERNEL); | |
216 | if (!dma->vaddr_pages) | |
217 | return -ENOMEM; | |
218 | ||
219 | dma->dma_addr = kcalloc(nr_pages, sizeof(*dma->dma_addr), GFP_KERNEL); | |
220 | if (!dma->dma_addr) { | |
221 | kfree(dma->vaddr_pages); | |
222 | return -ENOMEM; | |
223 | } | |
224 | for (i = 0; i < nr_pages; i++) { | |
225 | void *addr; | |
226 | ||
227 | addr = dma_alloc_coherent(dma->dev, PAGE_SIZE, | |
228 | &(dma->dma_addr[i]), GFP_KERNEL); | |
229 | if (addr == NULL) | |
230 | goto out_free_pages; | |
231 | ||
232 | dma->vaddr_pages[i] = virt_to_page(addr); | |
233 | } | |
234 | dma->vaddr = vmap(dma->vaddr_pages, nr_pages, VM_MAP | VM_IOREMAP, | |
235 | PAGE_KERNEL); | |
bb6dbe74 | 236 | if (NULL == dma->vaddr) { |
1faa39e0 | 237 | dprintk(1, "vmalloc_32(%lu pages) failed\n", nr_pages); |
7b4eeed1 | 238 | goto out_free_pages; |
7a7d9a89 | 239 | } |
7a02264c | 240 | |
1faa39e0 | 241 | dprintk(1, "vmalloc is at addr %p, size=%lu\n", |
b1a5dea6 | 242 | dma->vaddr, nr_pages << PAGE_SHIFT); |
7a02264c | 243 | |
bb6dbe74 | 244 | memset(dma->vaddr, 0, nr_pages << PAGE_SHIFT); |
7a7d9a89 | 245 | dma->nr_pages = nr_pages; |
7a02264c | 246 | |
7a7d9a89 | 247 | return 0; |
7b4eeed1 JH |
248 | out_free_pages: |
249 | while (i > 0) { | |
23d3090f DC |
250 | void *addr; |
251 | ||
7b4eeed1 | 252 | i--; |
23d3090f DC |
253 | addr = page_address(dma->vaddr_pages[i]); |
254 | dma_free_coherent(dma->dev, PAGE_SIZE, addr, dma->dma_addr[i]); | |
7b4eeed1 JH |
255 | } |
256 | kfree(dma->dma_addr); | |
257 | dma->dma_addr = NULL; | |
258 | kfree(dma->vaddr_pages); | |
259 | dma->vaddr_pages = NULL; | |
260 | ||
261 | return -ENOMEM; | |
262 | ||
7a7d9a89 MCC |
263 | } |
264 | ||
861360a5 | 265 | static int videobuf_dma_init_overlay(struct videobuf_dmabuf *dma, int direction, |
1faa39e0 | 266 | dma_addr_t addr, unsigned long nr_pages) |
7a7d9a89 | 267 | { |
1faa39e0 | 268 | dprintk(1, "init overlay [%lu pages @ bus 0x%lx]\n", |
7a02264c | 269 | nr_pages, (unsigned long)addr); |
7a7d9a89 | 270 | dma->direction = direction; |
7a02264c | 271 | |
7a7d9a89 MCC |
272 | if (0 == addr) |
273 | return -EINVAL; | |
274 | ||
275 | dma->bus_addr = addr; | |
276 | dma->nr_pages = nr_pages; | |
7a02264c | 277 | |
7a7d9a89 MCC |
278 | return 0; |
279 | } | |
280 | ||
861360a5 | 281 | static int videobuf_dma_map(struct device *dev, struct videobuf_dmabuf *dma) |
7a7d9a89 | 282 | { |
7a02264c | 283 | MAGIC_CHECK(dma->magic, MAGIC_DMABUF); |
7a7d9a89 MCC |
284 | BUG_ON(0 == dma->nr_pages); |
285 | ||
286 | if (dma->pages) { | |
287 | dma->sglist = videobuf_pages_to_sg(dma->pages, dma->nr_pages, | |
2fc11536 | 288 | dma->offset, dma->size); |
7a7d9a89 | 289 | } |
bb6dbe74 LP |
290 | if (dma->vaddr) { |
291 | dma->sglist = videobuf_vmalloc_to_sg(dma->vaddr, | |
7a02264c | 292 | dma->nr_pages); |
7a7d9a89 MCC |
293 | } |
294 | if (dma->bus_addr) { | |
1010ed13 | 295 | dma->sglist = vmalloc(sizeof(*dma->sglist)); |
7a7d9a89 | 296 | if (NULL != dma->sglist) { |
7a02264c PO |
297 | dma->sglen = 1; |
298 | sg_dma_address(&dma->sglist[0]) = dma->bus_addr | |
299 | & PAGE_MASK; | |
300 | dma->sglist[0].offset = dma->bus_addr & ~PAGE_MASK; | |
301 | sg_dma_len(&dma->sglist[0]) = dma->nr_pages * PAGE_SIZE; | |
7a7d9a89 MCC |
302 | } |
303 | } | |
304 | if (NULL == dma->sglist) { | |
7a02264c | 305 | dprintk(1, "scatterlist is NULL\n"); |
7a7d9a89 MCC |
306 | return -ENOMEM; |
307 | } | |
308 | if (!dma->bus_addr) { | |
95268403 | 309 | dma->sglen = dma_map_sg(dev, dma->sglist, |
7a7d9a89 | 310 | dma->nr_pages, dma->direction); |
7a7d9a89 MCC |
311 | if (0 == dma->sglen) { |
312 | printk(KERN_WARNING | |
7a02264c | 313 | "%s: videobuf_map_sg failed\n", __func__); |
1010ed13 | 314 | vfree(dma->sglist); |
7a7d9a89 MCC |
315 | dma->sglist = NULL; |
316 | dma->sglen = 0; | |
92051b28 | 317 | return -ENOMEM; |
7a7d9a89 MCC |
318 | } |
319 | } | |
7a02264c | 320 | |
7a7d9a89 MCC |
321 | return 0; |
322 | } | |
323 | ||
95268403 | 324 | int videobuf_dma_unmap(struct device *dev, struct videobuf_dmabuf *dma) |
7a7d9a89 | 325 | { |
0705135e | 326 | MAGIC_CHECK(dma->magic, MAGIC_DMABUF); |
7a02264c | 327 | |
7a7d9a89 MCC |
328 | if (!dma->sglen) |
329 | return 0; | |
330 | ||
4573027b | 331 | dma_unmap_sg(dev, dma->sglist, dma->nr_pages, dma->direction); |
5ddff434 | 332 | |
1010ed13 | 333 | vfree(dma->sglist); |
7a7d9a89 MCC |
334 | dma->sglist = NULL; |
335 | dma->sglen = 0; | |
7a02264c | 336 | |
7a7d9a89 MCC |
337 | return 0; |
338 | } | |
7a02264c | 339 | EXPORT_SYMBOL_GPL(videobuf_dma_unmap); |
7a7d9a89 MCC |
340 | |
341 | int videobuf_dma_free(struct videobuf_dmabuf *dma) | |
342 | { | |
7a02264c PO |
343 | int i; |
344 | MAGIC_CHECK(dma->magic, MAGIC_DMABUF); | |
7a7d9a89 MCC |
345 | BUG_ON(dma->sglen); |
346 | ||
347 | if (dma->pages) { | |
f1f6a7dd JH |
348 | unpin_user_pages_dirty_lock(dma->pages, dma->nr_pages, |
349 | dma->direction == DMA_FROM_DEVICE); | |
7a7d9a89 MCC |
350 | kfree(dma->pages); |
351 | dma->pages = NULL; | |
352 | } | |
353 | ||
7b4eeed1 JH |
354 | if (dma->dma_addr) { |
355 | for (i = 0; i < dma->nr_pages; i++) { | |
356 | void *addr; | |
357 | ||
358 | addr = page_address(dma->vaddr_pages[i]); | |
359 | dma_free_coherent(dma->dev, PAGE_SIZE, addr, | |
360 | dma->dma_addr[i]); | |
361 | } | |
362 | kfree(dma->dma_addr); | |
363 | dma->dma_addr = NULL; | |
364 | kfree(dma->vaddr_pages); | |
365 | dma->vaddr_pages = NULL; | |
366 | vunmap(dma->vaddr); | |
367 | dma->vaddr = NULL; | |
368 | } | |
7a7d9a89 | 369 | |
7a02264c | 370 | if (dma->bus_addr) |
7a7d9a89 | 371 | dma->bus_addr = 0; |
0705135e | 372 | dma->direction = DMA_NONE; |
7a02264c | 373 | |
7a7d9a89 MCC |
374 | return 0; |
375 | } | |
7a02264c | 376 | EXPORT_SYMBOL_GPL(videobuf_dma_free); |
7a7d9a89 MCC |
377 | |
378 | /* --------------------------------------------------------------------- */ | |
379 | ||
7a02264c | 380 | static void videobuf_vm_open(struct vm_area_struct *vma) |
7a7d9a89 MCC |
381 | { |
382 | struct videobuf_mapping *map = vma->vm_private_data; | |
383 | ||
7a02264c PO |
384 | dprintk(2, "vm_open %p [count=%d,vma=%08lx-%08lx]\n", map, |
385 | map->count, vma->vm_start, vma->vm_end); | |
386 | ||
7a7d9a89 MCC |
387 | map->count++; |
388 | } | |
389 | ||
7a02264c | 390 | static void videobuf_vm_close(struct vm_area_struct *vma) |
7a7d9a89 MCC |
391 | { |
392 | struct videobuf_mapping *map = vma->vm_private_data; | |
393 | struct videobuf_queue *q = map->q; | |
0705135e | 394 | struct videobuf_dma_sg_memory *mem; |
7a7d9a89 MCC |
395 | int i; |
396 | ||
7a02264c PO |
397 | dprintk(2, "vm_close %p [count=%d,vma=%08lx-%08lx]\n", map, |
398 | map->count, vma->vm_start, vma->vm_end); | |
7a7d9a89 | 399 | |
cca36e2e HV |
400 | map->count--; |
401 | if (0 == map->count) { | |
7a02264c | 402 | dprintk(1, "munmap %p q=%p\n", map, q); |
cca36e2e | 403 | videobuf_queue_lock(q); |
7a7d9a89 MCC |
404 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { |
405 | if (NULL == q->bufs[i]) | |
406 | continue; | |
7a02264c | 407 | mem = q->bufs[i]->priv; |
7a7d9a89 MCC |
408 | if (!mem) |
409 | continue; | |
410 | ||
7a02264c | 411 | MAGIC_CHECK(mem->magic, MAGIC_SG_MEM); |
7a7d9a89 | 412 | |
851c0c96 | 413 | if (q->bufs[i]->map != map) |
7a7d9a89 | 414 | continue; |
851c0c96 | 415 | q->bufs[i]->map = NULL; |
7a7d9a89 | 416 | q->bufs[i]->baddr = 0; |
7a02264c | 417 | q->ops->buf_release(q, q->bufs[i]); |
7a7d9a89 | 418 | } |
cca36e2e | 419 | videobuf_queue_unlock(q); |
7a7d9a89 MCC |
420 | kfree(map); |
421 | } | |
7a7d9a89 MCC |
422 | } |
423 | ||
424 | /* | |
425 | * Get a anonymous page for the mapping. Make sure we can DMA to that | |
426 | * memory location with 32bit PCI devices (i.e. don't use highmem for | |
427 | * now ...). Bounce buffers don't work very well for the data rates | |
428 | * video capture has. | |
429 | */ | |
62d4cfd3 | 430 | static vm_fault_t videobuf_vm_fault(struct vm_fault *vmf) |
7a7d9a89 | 431 | { |
11bac800 | 432 | struct vm_area_struct *vma = vmf->vma; |
7a7d9a89 MCC |
433 | struct page *page; |
434 | ||
7a02264c | 435 | dprintk(3, "fault: fault @ %08lx [vma %08lx-%08lx]\n", |
1a29d85e | 436 | vmf->address, vma->vm_start, vma->vm_end); |
7a02264c | 437 | |
7a7d9a89 MCC |
438 | page = alloc_page(GFP_USER | __GFP_DMA32); |
439 | if (!page) | |
105354a0 | 440 | return VM_FAULT_OOM; |
1a29d85e | 441 | clear_user_highpage(page, vmf->address); |
105354a0 | 442 | vmf->page = page; |
7a02264c | 443 | |
105354a0 | 444 | return 0; |
7a7d9a89 MCC |
445 | } |
446 | ||
7a02264c PO |
447 | static const struct vm_operations_struct videobuf_vm_ops = { |
448 | .open = videobuf_vm_open, | |
449 | .close = videobuf_vm_close, | |
450 | .fault = videobuf_vm_fault, | |
7a7d9a89 MCC |
451 | }; |
452 | ||
453 | /* --------------------------------------------------------------------- | |
0705135e | 454 | * SG handlers for the generic methods |
7a7d9a89 MCC |
455 | */ |
456 | ||
457 | /* Allocated area consists on 3 parts: | |
458 | struct video_buffer | |
459 | struct <driver>_buffer (cx88_buffer, saa7134_buf, ...) | |
0705135e | 460 | struct videobuf_dma_sg_memory |
7a7d9a89 MCC |
461 | */ |
462 | ||
33c38283 | 463 | static struct videobuf_buffer *__videobuf_alloc_vb(size_t size) |
7a7d9a89 | 464 | { |
0705135e | 465 | struct videobuf_dma_sg_memory *mem; |
7a7d9a89 MCC |
466 | struct videobuf_buffer *vb; |
467 | ||
7a02264c | 468 | vb = kzalloc(size + sizeof(*mem), GFP_KERNEL); |
bee527f9 PO |
469 | if (!vb) |
470 | return vb; | |
7a7d9a89 | 471 | |
7a02264c PO |
472 | mem = vb->priv = ((char *)vb) + size; |
473 | mem->magic = MAGIC_SG_MEM; | |
7a7d9a89 MCC |
474 | |
475 | videobuf_dma_init(&mem->dma); | |
476 | ||
7a02264c PO |
477 | dprintk(1, "%s: allocated at %p(%ld+%ld) & %p(%ld)\n", |
478 | __func__, vb, (long)sizeof(*vb), (long)size - sizeof(*vb), | |
479 | mem, (long)sizeof(*mem)); | |
7a7d9a89 MCC |
480 | |
481 | return vb; | |
482 | } | |
483 | ||
037c75eb | 484 | static void *__videobuf_to_vaddr(struct videobuf_buffer *buf) |
59d34489 MCC |
485 | { |
486 | struct videobuf_dma_sg_memory *mem = buf->priv; | |
487 | BUG_ON(!mem); | |
488 | ||
489 | MAGIC_CHECK(mem->magic, MAGIC_SG_MEM); | |
490 | ||
bb6dbe74 | 491 | return mem->dma.vaddr; |
59d34489 MCC |
492 | } |
493 | ||
7a02264c PO |
494 | static int __videobuf_iolock(struct videobuf_queue *q, |
495 | struct videobuf_buffer *vb, | |
496 | struct v4l2_framebuffer *fbuf) | |
7a7d9a89 | 497 | { |
0705135e | 498 | struct videobuf_dma_sg_memory *mem = vb->priv; |
1faa39e0 MCC |
499 | unsigned long pages; |
500 | dma_addr_t bus; | |
501 | int err; | |
502 | ||
7a7d9a89 MCC |
503 | BUG_ON(!mem); |
504 | ||
0705135e | 505 | MAGIC_CHECK(mem->magic, MAGIC_SG_MEM); |
7a7d9a89 | 506 | |
7b4eeed1 JH |
507 | if (!mem->dma.dev) |
508 | mem->dma.dev = q->dev; | |
509 | else | |
510 | WARN_ON(mem->dma.dev != q->dev); | |
511 | ||
7a7d9a89 MCC |
512 | switch (vb->memory) { |
513 | case V4L2_MEMORY_MMAP: | |
514 | case V4L2_MEMORY_USERPTR: | |
515 | if (0 == vb->baddr) { | |
516 | /* no userspace addr -- kernel bounce buffer */ | |
517 | pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT; | |
7a02264c PO |
518 | err = videobuf_dma_init_kernel(&mem->dma, |
519 | DMA_FROM_DEVICE, | |
520 | pages); | |
7a7d9a89 MCC |
521 | if (0 != err) |
522 | return err; | |
9900132f | 523 | } else if (vb->memory == V4L2_MEMORY_USERPTR) { |
7a7d9a89 | 524 | /* dma directly to userspace */ |
7a02264c PO |
525 | err = videobuf_dma_init_user(&mem->dma, |
526 | DMA_FROM_DEVICE, | |
527 | vb->baddr, vb->bsize); | |
7a7d9a89 MCC |
528 | if (0 != err) |
529 | return err; | |
9900132f ML |
530 | } else { |
531 | /* NOTE: HACK: videobuf_iolock on V4L2_MEMORY_MMAP | |
532 | buffers can only be called from videobuf_qbuf | |
c1e8d7c6 | 533 | we take current->mm->mmap_lock there, to prevent |
9900132f ML |
534 | locking inversion, so don't take it here */ |
535 | ||
536 | err = videobuf_dma_init_user_locked(&mem->dma, | |
0705135e | 537 | DMA_FROM_DEVICE, |
9900132f ML |
538 | vb->baddr, vb->bsize); |
539 | if (0 != err) | |
540 | return err; | |
7a7d9a89 MCC |
541 | } |
542 | break; | |
543 | case V4L2_MEMORY_OVERLAY: | |
544 | if (NULL == fbuf) | |
545 | return -EINVAL; | |
546 | /* FIXME: need sanity checks for vb->boff */ | |
547 | /* | |
548 | * Using a double cast to avoid compiler warnings when | |
549 | * building for PAE. Compiler doesn't like direct casting | |
550 | * of a 32 bit ptr to 64 bit integer. | |
551 | */ | |
552 | bus = (dma_addr_t)(unsigned long)fbuf->base + vb->boff; | |
553 | pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT; | |
0705135e | 554 | err = videobuf_dma_init_overlay(&mem->dma, DMA_FROM_DEVICE, |
7a7d9a89 MCC |
555 | bus, pages); |
556 | if (0 != err) | |
557 | return err; | |
558 | break; | |
559 | default: | |
560 | BUG(); | |
561 | } | |
95268403 | 562 | err = videobuf_dma_map(q->dev, &mem->dma); |
7a7d9a89 MCC |
563 | if (0 != err) |
564 | return err; | |
565 | ||
566 | return 0; | |
567 | } | |
568 | ||
569 | static int __videobuf_sync(struct videobuf_queue *q, | |
570 | struct videobuf_buffer *buf) | |
571 | { | |
0705135e | 572 | struct videobuf_dma_sg_memory *mem = buf->priv; |
97f8105d MCC |
573 | BUG_ON(!mem || !mem->dma.sglen); |
574 | ||
7a02264c | 575 | MAGIC_CHECK(mem->magic, MAGIC_SG_MEM); |
97f8105d | 576 | MAGIC_CHECK(mem->dma.magic, MAGIC_DMABUF); |
7a7d9a89 | 577 | |
97f8105d | 578 | dma_sync_sg_for_cpu(q->dev, mem->dma.sglist, |
4573027b | 579 | mem->dma.nr_pages, mem->dma.direction); |
97f8105d MCC |
580 | |
581 | return 0; | |
7a7d9a89 MCC |
582 | } |
583 | ||
7a7d9a89 | 584 | static int __videobuf_mmap_mapper(struct videobuf_queue *q, |
0b62b737 HV |
585 | struct videobuf_buffer *buf, |
586 | struct vm_area_struct *vma) | |
7a7d9a89 | 587 | { |
0b62b737 | 588 | struct videobuf_dma_sg_memory *mem = buf->priv; |
7a7d9a89 | 589 | struct videobuf_mapping *map; |
474675ad | 590 | unsigned int first, last, size = 0, i; |
7a7d9a89 MCC |
591 | int retval; |
592 | ||
593 | retval = -EINVAL; | |
7a7d9a89 | 594 | |
0b62b737 HV |
595 | BUG_ON(!mem); |
596 | MAGIC_CHECK(mem->magic, MAGIC_SG_MEM); | |
597 | ||
7a7d9a89 MCC |
598 | /* look for first buffer to map */ |
599 | for (first = 0; first < VIDEO_MAX_FRAME; first++) { | |
0b62b737 HV |
600 | if (buf == q->bufs[first]) { |
601 | size = PAGE_ALIGN(q->bufs[first]->bsize); | |
7a7d9a89 | 602 | break; |
0b62b737 | 603 | } |
7a7d9a89 | 604 | } |
0b62b737 HV |
605 | |
606 | /* paranoia, should never happen since buf is always valid. */ | |
474675ad | 607 | if (!size) { |
7a02264c | 608 | dprintk(1, "mmap app bug: offset invalid [offset=0x%lx]\n", |
0b62b737 | 609 | (vma->vm_pgoff << PAGE_SHIFT)); |
7a7d9a89 MCC |
610 | goto done; |
611 | } | |
612 | ||
0b62b737 | 613 | last = first; |
7a7d9a89 MCC |
614 | |
615 | /* create mapping + update buffer list */ | |
616 | retval = -ENOMEM; | |
7a02264c | 617 | map = kmalloc(sizeof(struct videobuf_mapping), GFP_KERNEL); |
7a7d9a89 MCC |
618 | if (NULL == map) |
619 | goto done; | |
ce54093c BP |
620 | |
621 | size = 0; | |
622 | for (i = first; i <= last; i++) { | |
623 | if (NULL == q->bufs[i]) | |
624 | continue; | |
851c0c96 | 625 | q->bufs[i]->map = map; |
7a7d9a89 | 626 | q->bufs[i]->baddr = vma->vm_start + size; |
7cbefad0 | 627 | size += PAGE_ALIGN(q->bufs[i]->bsize); |
7a7d9a89 | 628 | } |
ce54093c | 629 | |
7a7d9a89 | 630 | map->count = 1; |
7a7d9a89 MCC |
631 | map->q = q; |
632 | vma->vm_ops = &videobuf_vm_ops; | |
1c71222e SB |
633 | /* using shared anonymous pages */ |
634 | vm_flags_mod(vma, VM_DONTEXPAND | VM_DONTDUMP, VM_IO); | |
7a7d9a89 | 635 | vma->vm_private_data = map; |
7a02264c PO |
636 | dprintk(1, "mmap %p: q=%p %08lx-%08lx pgoff %08lx bufs %d-%d\n", |
637 | map, q, vma->vm_start, vma->vm_end, vma->vm_pgoff, first, last); | |
7a7d9a89 MCC |
638 | retval = 0; |
639 | ||
7a02264c | 640 | done: |
7a7d9a89 MCC |
641 | return retval; |
642 | } | |
643 | ||
0705135e | 644 | static struct videobuf_qtype_ops sg_ops = { |
7a7d9a89 MCC |
645 | .magic = MAGIC_QTYPE_OPS, |
646 | ||
33c38283 | 647 | .alloc_vb = __videobuf_alloc_vb, |
7a7d9a89 MCC |
648 | .iolock = __videobuf_iolock, |
649 | .sync = __videobuf_sync, | |
7a7d9a89 | 650 | .mmap_mapper = __videobuf_mmap_mapper, |
037c75eb | 651 | .vaddr = __videobuf_to_vaddr, |
7a7d9a89 MCC |
652 | }; |
653 | ||
0705135e | 654 | void *videobuf_sg_alloc(size_t size) |
7a7d9a89 MCC |
655 | { |
656 | struct videobuf_queue q; | |
657 | ||
658 | /* Required to make generic handler to call __videobuf_alloc */ | |
0705135e | 659 | q.int_ops = &sg_ops; |
7a7d9a89 | 660 | |
0705135e | 661 | q.msize = size; |
7a7d9a89 | 662 | |
33c38283 | 663 | return videobuf_alloc_vb(&q); |
7a7d9a89 | 664 | } |
7a02264c | 665 | EXPORT_SYMBOL_GPL(videobuf_sg_alloc); |
7a7d9a89 | 666 | |
7a02264c | 667 | void videobuf_queue_sg_init(struct videobuf_queue *q, |
38a54f35 | 668 | const struct videobuf_queue_ops *ops, |
0705135e | 669 | struct device *dev, |
7a7d9a89 MCC |
670 | spinlock_t *irqlock, |
671 | enum v4l2_buf_type type, | |
672 | enum v4l2_field field, | |
673 | unsigned int msize, | |
08bff03e HV |
674 | void *priv, |
675 | struct mutex *ext_lock) | |
7a7d9a89 | 676 | { |
d4cae5a5 | 677 | videobuf_queue_core_init(q, ops, dev, irqlock, type, field, msize, |
08bff03e | 678 | priv, &sg_ops, ext_lock); |
7a7d9a89 | 679 | } |
0705135e | 680 | EXPORT_SYMBOL_GPL(videobuf_queue_sg_init); |
7a7d9a89 | 681 |