Commit | Line | Data |
---|---|---|
87b9ad07 MCC |
1 | /* |
2 | * helper functions for vmalloc video4linux capture buffers | |
3 | * | |
5d6aaf50 | 4 | * The functions expect the hardware being able to scatter gather |
87b9ad07 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 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation; either version 2 | |
14 | */ | |
15 | ||
16 | #include <linux/init.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/moduleparam.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/interrupt.h> | |
21 | ||
22 | #include <linux/pci.h> | |
23 | #include <linux/vmalloc.h> | |
24 | #include <linux/pagemap.h> | |
25 | #include <asm/page.h> | |
26 | #include <asm/pgtable.h> | |
27 | ||
28 | #include <media/videobuf-vmalloc.h> | |
29 | ||
30 | #define MAGIC_DMABUF 0x17760309 | |
31 | #define MAGIC_VMAL_MEM 0x18221223 | |
32 | ||
7a02264c PO |
33 | #define MAGIC_CHECK(is, should) \ |
34 | if (unlikely((is) != (should))) { \ | |
35 | printk(KERN_ERR "magic mismatch: %x (expected %x)\n", \ | |
36 | is, should); \ | |
37 | BUG(); \ | |
38 | } | |
87b9ad07 | 39 | |
ff699e6b | 40 | static int debug; |
87b9ad07 MCC |
41 | module_param(debug, int, 0644); |
42 | ||
43 | MODULE_DESCRIPTION("helper module to manage video4linux vmalloc buffers"); | |
44 | MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>"); | |
45 | MODULE_LICENSE("GPL"); | |
46 | ||
7a02264c PO |
47 | #define dprintk(level, fmt, arg...) \ |
48 | if (debug >= level) \ | |
49 | printk(KERN_DEBUG "vbuf-vmalloc: " fmt , ## arg) | |
87b9ad07 MCC |
50 | |
51 | ||
52 | /***************************************************************************/ | |
53 | ||
7a02264c | 54 | static void videobuf_vm_open(struct vm_area_struct *vma) |
87b9ad07 MCC |
55 | { |
56 | struct videobuf_mapping *map = vma->vm_private_data; | |
57 | ||
7a02264c PO |
58 | dprintk(2, "vm_open %p [count=%u,vma=%08lx-%08lx]\n", map, |
59 | map->count, vma->vm_start, vma->vm_end); | |
87b9ad07 MCC |
60 | |
61 | map->count++; | |
62 | } | |
63 | ||
aaea56af | 64 | static void videobuf_vm_close(struct vm_area_struct *vma) |
87b9ad07 MCC |
65 | { |
66 | struct videobuf_mapping *map = vma->vm_private_data; | |
67 | struct videobuf_queue *q = map->q; | |
87b9ad07 MCC |
68 | int i; |
69 | ||
7a02264c | 70 | dprintk(2, "vm_close %p [count=%u,vma=%08lx-%08lx]\n", map, |
aaea56af | 71 | map->count, vma->vm_start, vma->vm_end); |
87b9ad07 MCC |
72 | |
73 | map->count--; | |
74 | if (0 == map->count) { | |
aaea56af MCC |
75 | struct videobuf_vmalloc_memory *mem; |
76 | ||
77 | dprintk(1, "munmap %p q=%p\n", map, q); | |
97397687 | 78 | videobuf_queue_lock(q); |
aa9479ed MCC |
79 | |
80 | /* We need first to cancel streams, before unmapping */ | |
81 | if (q->streaming) | |
82 | videobuf_queue_cancel(q); | |
83 | ||
87b9ad07 MCC |
84 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { |
85 | if (NULL == q->bufs[i]) | |
86 | continue; | |
87b9ad07 | 87 | |
851c0c96 | 88 | if (q->bufs[i]->map != map) |
87b9ad07 | 89 | continue; |
123f8ef6 | 90 | |
aaea56af MCC |
91 | mem = q->bufs[i]->priv; |
92 | if (mem) { | |
93 | /* This callback is called only if kernel has | |
94 | allocated memory and this memory is mmapped. | |
95 | In this case, memory should be freed, | |
96 | in order to do memory unmap. | |
97 | */ | |
aa9479ed | 98 | |
aaea56af | 99 | MAGIC_CHECK(mem->magic, MAGIC_VMAL_MEM); |
aa9479ed MCC |
100 | |
101 | /* vfree is not atomic - can't be | |
102 | called with IRQ's disabled | |
103 | */ | |
104 | dprintk(1, "%s: buf[%d] freeing (%p)\n", | |
bb6dbe74 | 105 | __func__, i, mem->vaddr); |
aa9479ed | 106 | |
bb6dbe74 LP |
107 | vfree(mem->vaddr); |
108 | mem->vaddr = NULL; | |
aaea56af MCC |
109 | } |
110 | ||
851c0c96 | 111 | q->bufs[i]->map = NULL; |
87b9ad07 | 112 | q->bufs[i]->baddr = 0; |
87b9ad07 | 113 | } |
aa9479ed | 114 | |
87b9ad07 | 115 | kfree(map); |
aa9479ed | 116 | |
97397687 | 117 | videobuf_queue_unlock(q); |
87b9ad07 | 118 | } |
aa9479ed | 119 | |
87b9ad07 MCC |
120 | return; |
121 | } | |
122 | ||
7a02264c | 123 | static const struct vm_operations_struct videobuf_vm_ops = { |
87b9ad07 MCC |
124 | .open = videobuf_vm_open, |
125 | .close = videobuf_vm_close, | |
126 | }; | |
127 | ||
128 | /* --------------------------------------------------------------------- | |
129 | * vmalloc handlers for the generic methods | |
130 | */ | |
131 | ||
132 | /* Allocated area consists on 3 parts: | |
133 | struct video_buffer | |
134 | struct <driver>_buffer (cx88_buffer, saa7134_buf, ...) | |
0705135e | 135 | struct videobuf_dma_sg_memory |
87b9ad07 MCC |
136 | */ |
137 | ||
33c38283 | 138 | static struct videobuf_buffer *__videobuf_alloc_vb(size_t size) |
87b9ad07 | 139 | { |
384b835a | 140 | struct videobuf_vmalloc_memory *mem; |
87b9ad07 MCC |
141 | struct videobuf_buffer *vb; |
142 | ||
7a02264c | 143 | vb = kzalloc(size + sizeof(*mem), GFP_KERNEL); |
bee527f9 PO |
144 | if (!vb) |
145 | return vb; | |
87b9ad07 | 146 | |
7a02264c PO |
147 | mem = vb->priv = ((char *)vb) + size; |
148 | mem->magic = MAGIC_VMAL_MEM; | |
87b9ad07 | 149 | |
7a02264c PO |
150 | dprintk(1, "%s: allocated at %p(%ld+%ld) & %p(%ld)\n", |
151 | __func__, vb, (long)sizeof(*vb), (long)size - sizeof(*vb), | |
152 | mem, (long)sizeof(*mem)); | |
87b9ad07 MCC |
153 | |
154 | return vb; | |
155 | } | |
156 | ||
7a02264c PO |
157 | static int __videobuf_iolock(struct videobuf_queue *q, |
158 | struct videobuf_buffer *vb, | |
159 | struct v4l2_framebuffer *fbuf) | |
87b9ad07 | 160 | { |
968ced78 | 161 | struct videobuf_vmalloc_memory *mem = vb->priv; |
aa9479ed | 162 | int pages; |
87b9ad07 MCC |
163 | |
164 | BUG_ON(!mem); | |
165 | ||
968ced78 | 166 | MAGIC_CHECK(mem->magic, MAGIC_VMAL_MEM); |
87b9ad07 | 167 | |
968ced78 MCC |
168 | switch (vb->memory) { |
169 | case V4L2_MEMORY_MMAP: | |
170 | dprintk(1, "%s memory method MMAP\n", __func__); | |
87b9ad07 | 171 | |
968ced78 | 172 | /* All handling should be done by __videobuf_mmap_mapper() */ |
bb6dbe74 | 173 | if (!mem->vaddr) { |
968ced78 MCC |
174 | printk(KERN_ERR "memory is not alloced/mmapped.\n"); |
175 | return -EINVAL; | |
176 | } | |
177 | break; | |
178 | case V4L2_MEMORY_USERPTR: | |
aa9479ed | 179 | pages = PAGE_ALIGN(vb->size); |
87b9ad07 | 180 | |
968ced78 MCC |
181 | dprintk(1, "%s memory method USERPTR\n", __func__); |
182 | ||
968ced78 MCC |
183 | if (vb->baddr) { |
184 | printk(KERN_ERR "USERPTR is currently not supported\n"); | |
185 | return -EINVAL; | |
186 | } | |
87b9ad07 | 187 | |
968ced78 | 188 | /* The only USERPTR currently supported is the one needed for |
7a02264c | 189 | * read() method. |
968ced78 MCC |
190 | */ |
191 | ||
bb6dbe74 LP |
192 | mem->vaddr = vmalloc_user(pages); |
193 | if (!mem->vaddr) { | |
968ced78 MCC |
194 | printk(KERN_ERR "vmalloc (%d pages) failed\n", pages); |
195 | return -ENOMEM; | |
87b9ad07 | 196 | } |
968ced78 | 197 | dprintk(1, "vmalloc is at addr %p (%d pages)\n", |
bb6dbe74 | 198 | mem->vaddr, pages); |
968ced78 MCC |
199 | |
200 | #if 0 | |
201 | int rc; | |
202 | /* Kernel userptr is used also by read() method. In this case, | |
203 | there's no need to remap, since data will be copied to user | |
204 | */ | |
205 | if (!vb->baddr) | |
206 | return 0; | |
207 | ||
208 | /* FIXME: to properly support USERPTR, remap should occur. | |
de1e575d | 209 | The code below won't work, since mem->vma = NULL |
968ced78 MCC |
210 | */ |
211 | /* Try to remap memory */ | |
212 | rc = remap_vmalloc_range(mem->vma, (void *)vb->baddr, 0); | |
213 | if (rc < 0) { | |
7a02264c | 214 | printk(KERN_ERR "mmap: remap failed with error %d", rc); |
968ced78 MCC |
215 | return -ENOMEM; |
216 | } | |
217 | #endif | |
218 | ||
219 | break; | |
968ced78 MCC |
220 | case V4L2_MEMORY_OVERLAY: |
221 | default: | |
222 | dprintk(1, "%s memory method OVERLAY/unknown\n", __func__); | |
223 | ||
224 | /* Currently, doesn't support V4L2_MEMORY_OVERLAY */ | |
225 | printk(KERN_ERR "Memory method currently unsupported.\n"); | |
226 | return -EINVAL; | |
87b9ad07 MCC |
227 | } |
228 | ||
229 | return 0; | |
230 | } | |
231 | ||
87b9ad07 | 232 | static int __videobuf_mmap_mapper(struct videobuf_queue *q, |
0b62b737 HV |
233 | struct videobuf_buffer *buf, |
234 | struct vm_area_struct *vma) | |
87b9ad07 | 235 | { |
384b835a | 236 | struct videobuf_vmalloc_memory *mem; |
87b9ad07 | 237 | struct videobuf_mapping *map; |
968ced78 | 238 | int retval, pages; |
87b9ad07 | 239 | |
968ced78 | 240 | dprintk(1, "%s\n", __func__); |
87b9ad07 MCC |
241 | |
242 | /* create mapping + update buffer list */ | |
968ced78 | 243 | map = kzalloc(sizeof(struct videobuf_mapping), GFP_KERNEL); |
87b9ad07 MCC |
244 | if (NULL == map) |
245 | return -ENOMEM; | |
246 | ||
0b62b737 | 247 | buf->map = map; |
87b9ad07 MCC |
248 | map->q = q; |
249 | ||
0b62b737 | 250 | buf->baddr = vma->vm_start; |
87b9ad07 | 251 | |
0b62b737 | 252 | mem = buf->priv; |
968ced78 MCC |
253 | BUG_ON(!mem); |
254 | MAGIC_CHECK(mem->magic, MAGIC_VMAL_MEM); | |
87b9ad07 | 255 | |
968ced78 | 256 | pages = PAGE_ALIGN(vma->vm_end - vma->vm_start); |
bb6dbe74 LP |
257 | mem->vaddr = vmalloc_user(pages); |
258 | if (!mem->vaddr) { | |
968ced78 MCC |
259 | printk(KERN_ERR "vmalloc (%d pages) failed\n", pages); |
260 | goto error; | |
261 | } | |
bb6dbe74 | 262 | dprintk(1, "vmalloc is at addr %p (%d pages)\n", mem->vaddr, pages); |
851c0c96 | 263 | |
87b9ad07 | 264 | /* Try to remap memory */ |
bb6dbe74 | 265 | retval = remap_vmalloc_range(vma, mem->vaddr, 0); |
968ced78 MCC |
266 | if (retval < 0) { |
267 | printk(KERN_ERR "mmap: remap failed with error %d. ", retval); | |
bb6dbe74 | 268 | vfree(mem->vaddr); |
968ced78 | 269 | goto error; |
87b9ad07 MCC |
270 | } |
271 | ||
968ced78 MCC |
272 | vma->vm_ops = &videobuf_vm_ops; |
273 | vma->vm_flags |= VM_DONTEXPAND | VM_RESERVED; | |
274 | vma->vm_private_data = map; | |
275 | ||
7a02264c | 276 | dprintk(1, "mmap %p: q=%p %08lx-%08lx (%lx) pgoff %08lx buf %d\n", |
968ced78 | 277 | map, q, vma->vm_start, vma->vm_end, |
0b62b737 HV |
278 | (long int)buf->bsize, |
279 | vma->vm_pgoff, buf->i); | |
87b9ad07 MCC |
280 | |
281 | videobuf_vm_open(vma); | |
282 | ||
968ced78 MCC |
283 | return 0; |
284 | ||
285 | error: | |
286 | mem = NULL; | |
287 | kfree(map); | |
288 | return -ENOMEM; | |
87b9ad07 MCC |
289 | } |
290 | ||
87b9ad07 MCC |
291 | static struct videobuf_qtype_ops qops = { |
292 | .magic = MAGIC_QTYPE_OPS, | |
293 | ||
33c38283 | 294 | .alloc_vb = __videobuf_alloc_vb, |
87b9ad07 | 295 | .iolock = __videobuf_iolock, |
87b9ad07 | 296 | .mmap_mapper = __videobuf_mmap_mapper, |
037c75eb | 297 | .vaddr = videobuf_to_vmalloc, |
87b9ad07 MCC |
298 | }; |
299 | ||
7a02264c | 300 | void videobuf_queue_vmalloc_init(struct videobuf_queue *q, |
38a54f35 | 301 | const struct videobuf_queue_ops *ops, |
f8b0bca1 | 302 | struct device *dev, |
87b9ad07 MCC |
303 | spinlock_t *irqlock, |
304 | enum v4l2_buf_type type, | |
305 | enum v4l2_field field, | |
306 | unsigned int msize, | |
08bff03e HV |
307 | void *priv, |
308 | struct mutex *ext_lock) | |
87b9ad07 | 309 | { |
d4cae5a5 | 310 | videobuf_queue_core_init(q, ops, dev, irqlock, type, field, msize, |
08bff03e | 311 | priv, &qops, ext_lock); |
87b9ad07 | 312 | } |
87b9ad07 MCC |
313 | EXPORT_SYMBOL_GPL(videobuf_queue_vmalloc_init); |
314 | ||
7a02264c | 315 | void *videobuf_to_vmalloc(struct videobuf_buffer *buf) |
87b9ad07 | 316 | { |
7a02264c PO |
317 | struct videobuf_vmalloc_memory *mem = buf->priv; |
318 | BUG_ON(!mem); | |
319 | MAGIC_CHECK(mem->magic, MAGIC_VMAL_MEM); | |
87b9ad07 | 320 | |
bb6dbe74 | 321 | return mem->vaddr; |
87b9ad07 MCC |
322 | } |
323 | EXPORT_SYMBOL_GPL(videobuf_to_vmalloc); | |
324 | ||
7a02264c | 325 | void videobuf_vmalloc_free(struct videobuf_buffer *buf) |
87b9ad07 | 326 | { |
968ced78 | 327 | struct videobuf_vmalloc_memory *mem = buf->priv; |
87b9ad07 | 328 | |
aaea56af MCC |
329 | /* mmapped memory can't be freed here, otherwise mmapped region |
330 | would be released, while still needed. In this case, the memory | |
331 | release should happen inside videobuf_vm_close(). | |
332 | So, it should free memory only if the memory were allocated for | |
333 | read() operation. | |
334 | */ | |
5993a663 | 335 | if ((buf->memory != V4L2_MEMORY_USERPTR) || buf->baddr) |
aaea56af MCC |
336 | return; |
337 | ||
968ced78 MCC |
338 | if (!mem) |
339 | return; | |
340 | ||
341 | MAGIC_CHECK(mem->magic, MAGIC_VMAL_MEM); | |
87b9ad07 | 342 | |
bb6dbe74 LP |
343 | vfree(mem->vaddr); |
344 | mem->vaddr = NULL; | |
968ced78 | 345 | |
87b9ad07 MCC |
346 | return; |
347 | } | |
348 | EXPORT_SYMBOL_GPL(videobuf_vmalloc_free); | |
349 |