Magnus Damm | 2cc45cf | 2008-07-16 21:33:39 -0300 | [diff] [blame] | 1 | /* |
| 2 | * helper functions for physically contiguous capture buffers |
| 3 | * |
| 4 | * The functions support hardware lacking scatter gather support |
| 5 | * (i.e. the buffers must be linear in physical memory) |
| 6 | * |
| 7 | * Copyright (c) 2008 Magnus Damm |
| 8 | * |
| 9 | * Based on videobuf-vmalloc.c, |
| 10 | * (c) 2007 Mauro Carvalho Chehab, <mchehab@infradead.org> |
| 11 | * |
| 12 | * This program is free software; you can redistribute it and/or modify |
| 13 | * it under the terms of the GNU General Public License as published by |
| 14 | * the Free Software Foundation; either version 2 |
| 15 | */ |
| 16 | |
| 17 | #include <linux/init.h> |
| 18 | #include <linux/module.h> |
Hans Verkuil | f19ad39 | 2008-07-18 02:02:50 -0300 | [diff] [blame] | 19 | #include <linux/mm.h> |
Magnus Damm | 720b17e | 2009-06-16 15:32:36 -0700 | [diff] [blame] | 20 | #include <linux/pagemap.h> |
Magnus Damm | 2cc45cf | 2008-07-16 21:33:39 -0300 | [diff] [blame] | 21 | #include <linux/dma-mapping.h> |
Guennadi Liakhovetski | f39c1ab | 2009-11-09 16:11:34 -0300 | [diff] [blame] | 22 | #include <linux/sched.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 23 | #include <linux/slab.h> |
Magnus Damm | 2cc45cf | 2008-07-16 21:33:39 -0300 | [diff] [blame] | 24 | #include <media/videobuf-dma-contig.h> |
| 25 | |
| 26 | struct videobuf_dma_contig_memory { |
| 27 | u32 magic; |
| 28 | void *vaddr; |
| 29 | dma_addr_t dma_handle; |
Federico Vaga | a8f3c20 | 2012-04-12 12:39:37 -0300 | [diff] [blame^] | 30 | bool cached; |
Magnus Damm | 2cc45cf | 2008-07-16 21:33:39 -0300 | [diff] [blame] | 31 | unsigned long size; |
| 32 | }; |
| 33 | |
| 34 | #define MAGIC_DC_MEM 0x0733ac61 |
Guennadi Liakhovetski | c60f2b5 | 2008-07-17 17:30:47 -0300 | [diff] [blame] | 35 | #define MAGIC_CHECK(is, should) \ |
| 36 | if (unlikely((is) != (should))) { \ |
| 37 | pr_err("magic mismatch: %x expected %x\n", (is), (should)); \ |
| 38 | BUG(); \ |
Magnus Damm | 2cc45cf | 2008-07-16 21:33:39 -0300 | [diff] [blame] | 39 | } |
| 40 | |
Federico Vaga | a8f3c20 | 2012-04-12 12:39:37 -0300 | [diff] [blame^] | 41 | static int __videobuf_dc_alloc(struct device *dev, |
| 42 | struct videobuf_dma_contig_memory *mem, |
| 43 | unsigned long size, unsigned long flags) |
| 44 | { |
| 45 | mem->size = size; |
| 46 | if (mem->cached) { |
| 47 | mem->vaddr = alloc_pages_exact(mem->size, flags | GFP_DMA); |
| 48 | if (mem->vaddr) { |
| 49 | int err; |
| 50 | |
| 51 | mem->dma_handle = dma_map_single(dev, mem->vaddr, |
| 52 | mem->size, |
| 53 | DMA_FROM_DEVICE); |
| 54 | err = dma_mapping_error(dev, mem->dma_handle); |
| 55 | if (err) { |
| 56 | dev_err(dev, "dma_map_single failed\n"); |
| 57 | |
| 58 | free_pages_exact(mem->vaddr, mem->size); |
| 59 | mem->vaddr = 0; |
| 60 | return err; |
| 61 | } |
| 62 | } |
| 63 | } else |
| 64 | mem->vaddr = dma_alloc_coherent(dev, mem->size, |
| 65 | &mem->dma_handle, flags); |
| 66 | |
| 67 | if (!mem->vaddr) { |
| 68 | dev_err(dev, "memory alloc size %ld failed\n", mem->size); |
| 69 | return -ENOMEM; |
| 70 | } |
| 71 | |
| 72 | dev_dbg(dev, "dma mapped data is at %p (%ld)\n", mem->vaddr, mem->size); |
| 73 | |
| 74 | return 0; |
| 75 | } |
| 76 | |
| 77 | static void __videobuf_dc_free(struct device *dev, |
| 78 | struct videobuf_dma_contig_memory *mem) |
| 79 | { |
| 80 | if (mem->cached) { |
| 81 | if (!mem->vaddr) |
| 82 | return; |
| 83 | dma_unmap_single(dev, mem->dma_handle, mem->size, |
| 84 | DMA_FROM_DEVICE); |
| 85 | free_pages_exact(mem->vaddr, mem->size); |
| 86 | } else |
| 87 | dma_free_coherent(dev, mem->size, mem->vaddr, mem->dma_handle); |
| 88 | |
| 89 | mem->vaddr = NULL; |
| 90 | } |
| 91 | |
| 92 | static void videobuf_vm_open(struct vm_area_struct *vma) |
Magnus Damm | 2cc45cf | 2008-07-16 21:33:39 -0300 | [diff] [blame] | 93 | { |
| 94 | struct videobuf_mapping *map = vma->vm_private_data; |
| 95 | |
| 96 | dev_dbg(map->q->dev, "vm_open %p [count=%u,vma=%08lx-%08lx]\n", |
| 97 | map, map->count, vma->vm_start, vma->vm_end); |
| 98 | |
| 99 | map->count++; |
| 100 | } |
| 101 | |
| 102 | static void videobuf_vm_close(struct vm_area_struct *vma) |
| 103 | { |
| 104 | struct videobuf_mapping *map = vma->vm_private_data; |
| 105 | struct videobuf_queue *q = map->q; |
| 106 | int i; |
| 107 | |
Guennadi Liakhovetski | f35f1bb | 2010-03-23 11:52:11 -0300 | [diff] [blame] | 108 | dev_dbg(q->dev, "vm_close %p [count=%u,vma=%08lx-%08lx]\n", |
Magnus Damm | 2cc45cf | 2008-07-16 21:33:39 -0300 | [diff] [blame] | 109 | map, map->count, vma->vm_start, vma->vm_end); |
| 110 | |
| 111 | map->count--; |
| 112 | if (0 == map->count) { |
| 113 | struct videobuf_dma_contig_memory *mem; |
| 114 | |
Guennadi Liakhovetski | f35f1bb | 2010-03-23 11:52:11 -0300 | [diff] [blame] | 115 | dev_dbg(q->dev, "munmap %p q=%p\n", map, q); |
Hans Verkuil | 9739768 | 2010-09-20 17:24:30 -0300 | [diff] [blame] | 116 | videobuf_queue_lock(q); |
Magnus Damm | 2cc45cf | 2008-07-16 21:33:39 -0300 | [diff] [blame] | 117 | |
| 118 | /* We need first to cancel streams, before unmapping */ |
| 119 | if (q->streaming) |
| 120 | videobuf_queue_cancel(q); |
| 121 | |
| 122 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { |
| 123 | if (NULL == q->bufs[i]) |
| 124 | continue; |
| 125 | |
| 126 | if (q->bufs[i]->map != map) |
| 127 | continue; |
| 128 | |
| 129 | mem = q->bufs[i]->priv; |
| 130 | if (mem) { |
| 131 | /* This callback is called only if kernel has |
| 132 | allocated memory and this memory is mmapped. |
| 133 | In this case, memory should be freed, |
| 134 | in order to do memory unmap. |
| 135 | */ |
| 136 | |
| 137 | MAGIC_CHECK(mem->magic, MAGIC_DC_MEM); |
| 138 | |
| 139 | /* vfree is not atomic - can't be |
| 140 | called with IRQ's disabled |
| 141 | */ |
Guennadi Liakhovetski | f35f1bb | 2010-03-23 11:52:11 -0300 | [diff] [blame] | 142 | dev_dbg(q->dev, "buf[%d] freeing %p\n", |
Magnus Damm | 2cc45cf | 2008-07-16 21:33:39 -0300 | [diff] [blame] | 143 | i, mem->vaddr); |
| 144 | |
Federico Vaga | a8f3c20 | 2012-04-12 12:39:37 -0300 | [diff] [blame^] | 145 | __videobuf_dc_free(q->dev, mem); |
Magnus Damm | 2cc45cf | 2008-07-16 21:33:39 -0300 | [diff] [blame] | 146 | mem->vaddr = NULL; |
| 147 | } |
| 148 | |
Federico Vaga | a8f3c20 | 2012-04-12 12:39:37 -0300 | [diff] [blame^] | 149 | q->bufs[i]->map = NULL; |
Magnus Damm | 2cc45cf | 2008-07-16 21:33:39 -0300 | [diff] [blame] | 150 | q->bufs[i]->baddr = 0; |
| 151 | } |
| 152 | |
| 153 | kfree(map); |
| 154 | |
Hans Verkuil | 9739768 | 2010-09-20 17:24:30 -0300 | [diff] [blame] | 155 | videobuf_queue_unlock(q); |
Magnus Damm | 2cc45cf | 2008-07-16 21:33:39 -0300 | [diff] [blame] | 156 | } |
| 157 | } |
| 158 | |
Alexey Dobriyan | f0f37e2 | 2009-09-27 22:29:37 +0400 | [diff] [blame] | 159 | static const struct vm_operations_struct videobuf_vm_ops = { |
Federico Vaga | a8f3c20 | 2012-04-12 12:39:37 -0300 | [diff] [blame^] | 160 | .open = videobuf_vm_open, |
| 161 | .close = videobuf_vm_close, |
Magnus Damm | 2cc45cf | 2008-07-16 21:33:39 -0300 | [diff] [blame] | 162 | }; |
| 163 | |
Magnus Damm | 720b17e | 2009-06-16 15:32:36 -0700 | [diff] [blame] | 164 | /** |
| 165 | * videobuf_dma_contig_user_put() - reset pointer to user space buffer |
| 166 | * @mem: per-buffer private videobuf-dma-contig data |
| 167 | * |
| 168 | * This function resets the user space pointer |
| 169 | */ |
| 170 | static void videobuf_dma_contig_user_put(struct videobuf_dma_contig_memory *mem) |
| 171 | { |
Magnus Damm | 720b17e | 2009-06-16 15:32:36 -0700 | [diff] [blame] | 172 | mem->dma_handle = 0; |
| 173 | mem->size = 0; |
| 174 | } |
| 175 | |
| 176 | /** |
| 177 | * videobuf_dma_contig_user_get() - setup user space memory pointer |
| 178 | * @mem: per-buffer private videobuf-dma-contig data |
| 179 | * @vb: video buffer to map |
| 180 | * |
| 181 | * This function validates and sets up a pointer to user space memory. |
| 182 | * Only physically contiguous pfn-mapped memory is accepted. |
| 183 | * |
| 184 | * Returns 0 if successful. |
| 185 | */ |
| 186 | static int videobuf_dma_contig_user_get(struct videobuf_dma_contig_memory *mem, |
| 187 | struct videobuf_buffer *vb) |
| 188 | { |
| 189 | struct mm_struct *mm = current->mm; |
| 190 | struct vm_area_struct *vma; |
| 191 | unsigned long prev_pfn, this_pfn; |
| 192 | unsigned long pages_done, user_address; |
Muralidharan Karicheri | 31bedfa | 2009-12-10 16:47:48 -0300 | [diff] [blame] | 193 | unsigned int offset; |
Magnus Damm | 720b17e | 2009-06-16 15:32:36 -0700 | [diff] [blame] | 194 | int ret; |
| 195 | |
Muralidharan Karicheri | 31bedfa | 2009-12-10 16:47:48 -0300 | [diff] [blame] | 196 | offset = vb->baddr & ~PAGE_MASK; |
| 197 | mem->size = PAGE_ALIGN(vb->size + offset); |
Magnus Damm | 720b17e | 2009-06-16 15:32:36 -0700 | [diff] [blame] | 198 | ret = -EINVAL; |
| 199 | |
| 200 | down_read(&mm->mmap_sem); |
| 201 | |
| 202 | vma = find_vma(mm, vb->baddr); |
| 203 | if (!vma) |
| 204 | goto out_up; |
| 205 | |
| 206 | if ((vb->baddr + mem->size) > vma->vm_end) |
| 207 | goto out_up; |
| 208 | |
| 209 | pages_done = 0; |
| 210 | prev_pfn = 0; /* kill warning */ |
| 211 | user_address = vb->baddr; |
| 212 | |
| 213 | while (pages_done < (mem->size >> PAGE_SHIFT)) { |
| 214 | ret = follow_pfn(vma, user_address, &this_pfn); |
| 215 | if (ret) |
| 216 | break; |
| 217 | |
| 218 | if (pages_done == 0) |
Muralidharan Karicheri | 31bedfa | 2009-12-10 16:47:48 -0300 | [diff] [blame] | 219 | mem->dma_handle = (this_pfn << PAGE_SHIFT) + offset; |
Magnus Damm | 720b17e | 2009-06-16 15:32:36 -0700 | [diff] [blame] | 220 | else if (this_pfn != (prev_pfn + 1)) |
| 221 | ret = -EFAULT; |
| 222 | |
| 223 | if (ret) |
| 224 | break; |
| 225 | |
| 226 | prev_pfn = this_pfn; |
| 227 | user_address += PAGE_SIZE; |
| 228 | pages_done++; |
| 229 | } |
| 230 | |
Federico Vaga | a8f3c20 | 2012-04-12 12:39:37 -0300 | [diff] [blame^] | 231 | out_up: |
Magnus Damm | 720b17e | 2009-06-16 15:32:36 -0700 | [diff] [blame] | 232 | up_read(¤t->mm->mmap_sem); |
| 233 | |
| 234 | return ret; |
| 235 | } |
| 236 | |
Federico Vaga | a8f3c20 | 2012-04-12 12:39:37 -0300 | [diff] [blame^] | 237 | static struct videobuf_buffer *__videobuf_alloc_vb(size_t size, bool cached) |
Magnus Damm | 2cc45cf | 2008-07-16 21:33:39 -0300 | [diff] [blame] | 238 | { |
| 239 | struct videobuf_dma_contig_memory *mem; |
| 240 | struct videobuf_buffer *vb; |
| 241 | |
| 242 | vb = kzalloc(size + sizeof(*mem), GFP_KERNEL); |
| 243 | if (vb) { |
Federico Vaga | a8f3c20 | 2012-04-12 12:39:37 -0300 | [diff] [blame^] | 244 | vb->priv = ((char *)vb) + size; |
| 245 | mem = vb->priv; |
Magnus Damm | 2cc45cf | 2008-07-16 21:33:39 -0300 | [diff] [blame] | 246 | mem->magic = MAGIC_DC_MEM; |
Federico Vaga | a8f3c20 | 2012-04-12 12:39:37 -0300 | [diff] [blame^] | 247 | mem->cached = cached; |
Magnus Damm | 2cc45cf | 2008-07-16 21:33:39 -0300 | [diff] [blame] | 248 | } |
| 249 | |
| 250 | return vb; |
| 251 | } |
| 252 | |
Federico Vaga | a8f3c20 | 2012-04-12 12:39:37 -0300 | [diff] [blame^] | 253 | static struct videobuf_buffer *__videobuf_alloc_uncached(size_t size) |
| 254 | { |
| 255 | return __videobuf_alloc_vb(size, false); |
| 256 | } |
| 257 | |
| 258 | static struct videobuf_buffer *__videobuf_alloc_cached(size_t size) |
| 259 | { |
| 260 | return __videobuf_alloc_vb(size, true); |
| 261 | } |
| 262 | |
Hans Verkuil | 037c75e | 2010-03-28 08:18:37 -0300 | [diff] [blame] | 263 | static void *__videobuf_to_vaddr(struct videobuf_buffer *buf) |
Magnus Damm | 2cc45cf | 2008-07-16 21:33:39 -0300 | [diff] [blame] | 264 | { |
| 265 | struct videobuf_dma_contig_memory *mem = buf->priv; |
| 266 | |
| 267 | BUG_ON(!mem); |
| 268 | MAGIC_CHECK(mem->magic, MAGIC_DC_MEM); |
| 269 | |
| 270 | return mem->vaddr; |
| 271 | } |
| 272 | |
| 273 | static int __videobuf_iolock(struct videobuf_queue *q, |
| 274 | struct videobuf_buffer *vb, |
| 275 | struct v4l2_framebuffer *fbuf) |
| 276 | { |
| 277 | struct videobuf_dma_contig_memory *mem = vb->priv; |
| 278 | |
| 279 | BUG_ON(!mem); |
| 280 | MAGIC_CHECK(mem->magic, MAGIC_DC_MEM); |
| 281 | |
| 282 | switch (vb->memory) { |
| 283 | case V4L2_MEMORY_MMAP: |
| 284 | dev_dbg(q->dev, "%s memory method MMAP\n", __func__); |
| 285 | |
| 286 | /* All handling should be done by __videobuf_mmap_mapper() */ |
| 287 | if (!mem->vaddr) { |
| 288 | dev_err(q->dev, "memory is not alloced/mmapped.\n"); |
| 289 | return -EINVAL; |
| 290 | } |
| 291 | break; |
| 292 | case V4L2_MEMORY_USERPTR: |
| 293 | dev_dbg(q->dev, "%s memory method USERPTR\n", __func__); |
| 294 | |
Magnus Damm | 720b17e | 2009-06-16 15:32:36 -0700 | [diff] [blame] | 295 | /* handle pointer from user space */ |
Magnus Damm | 2cc45cf | 2008-07-16 21:33:39 -0300 | [diff] [blame] | 296 | if (vb->baddr) |
Magnus Damm | 720b17e | 2009-06-16 15:32:36 -0700 | [diff] [blame] | 297 | return videobuf_dma_contig_user_get(mem, vb); |
Magnus Damm | 2cc45cf | 2008-07-16 21:33:39 -0300 | [diff] [blame] | 298 | |
Magnus Damm | 720b17e | 2009-06-16 15:32:36 -0700 | [diff] [blame] | 299 | /* allocate memory for the read() method */ |
Federico Vaga | a8f3c20 | 2012-04-12 12:39:37 -0300 | [diff] [blame^] | 300 | if (__videobuf_dc_alloc(q->dev, mem, PAGE_ALIGN(vb->size), |
| 301 | GFP_KERNEL)) |
Magnus Damm | 2cc45cf | 2008-07-16 21:33:39 -0300 | [diff] [blame] | 302 | return -ENOMEM; |
Magnus Damm | 2cc45cf | 2008-07-16 21:33:39 -0300 | [diff] [blame] | 303 | break; |
| 304 | case V4L2_MEMORY_OVERLAY: |
| 305 | default: |
Federico Vaga | a8f3c20 | 2012-04-12 12:39:37 -0300 | [diff] [blame^] | 306 | dev_dbg(q->dev, "%s memory method OVERLAY/unknown\n", __func__); |
Magnus Damm | 2cc45cf | 2008-07-16 21:33:39 -0300 | [diff] [blame] | 307 | return -EINVAL; |
| 308 | } |
| 309 | |
| 310 | return 0; |
| 311 | } |
| 312 | |
Federico Vaga | a8f3c20 | 2012-04-12 12:39:37 -0300 | [diff] [blame^] | 313 | static int __videobuf_sync(struct videobuf_queue *q, |
| 314 | struct videobuf_buffer *buf) |
| 315 | { |
| 316 | struct videobuf_dma_contig_memory *mem = buf->priv; |
| 317 | BUG_ON(!mem); |
| 318 | MAGIC_CHECK(mem->magic, MAGIC_DC_MEM); |
| 319 | |
| 320 | dma_sync_single_for_cpu(q->dev, mem->dma_handle, mem->size, |
| 321 | DMA_FROM_DEVICE); |
| 322 | |
| 323 | return 0; |
| 324 | } |
| 325 | |
Magnus Damm | 2cc45cf | 2008-07-16 21:33:39 -0300 | [diff] [blame] | 326 | static int __videobuf_mmap_mapper(struct videobuf_queue *q, |
Hans Verkuil | 0b62b73 | 2010-03-28 09:09:05 -0300 | [diff] [blame] | 327 | struct videobuf_buffer *buf, |
Magnus Damm | 2cc45cf | 2008-07-16 21:33:39 -0300 | [diff] [blame] | 328 | struct vm_area_struct *vma) |
| 329 | { |
| 330 | struct videobuf_dma_contig_memory *mem; |
| 331 | struct videobuf_mapping *map; |
Magnus Damm | 2cc45cf | 2008-07-16 21:33:39 -0300 | [diff] [blame] | 332 | int retval; |
Hans Verkuil | 0b62b73 | 2010-03-28 09:09:05 -0300 | [diff] [blame] | 333 | unsigned long size; |
Federico Vaga | a8f3c20 | 2012-04-12 12:39:37 -0300 | [diff] [blame^] | 334 | unsigned long pos, start = vma->vm_start; |
| 335 | struct page *page; |
Magnus Damm | 2cc45cf | 2008-07-16 21:33:39 -0300 | [diff] [blame] | 336 | |
| 337 | dev_dbg(q->dev, "%s\n", __func__); |
Magnus Damm | 2cc45cf | 2008-07-16 21:33:39 -0300 | [diff] [blame] | 338 | |
| 339 | /* create mapping + update buffer list */ |
| 340 | map = kzalloc(sizeof(struct videobuf_mapping), GFP_KERNEL); |
| 341 | if (!map) |
| 342 | return -ENOMEM; |
| 343 | |
Hans Verkuil | 0b62b73 | 2010-03-28 09:09:05 -0300 | [diff] [blame] | 344 | buf->map = map; |
Magnus Damm | 2cc45cf | 2008-07-16 21:33:39 -0300 | [diff] [blame] | 345 | map->q = q; |
| 346 | |
Hans Verkuil | 0b62b73 | 2010-03-28 09:09:05 -0300 | [diff] [blame] | 347 | buf->baddr = vma->vm_start; |
Magnus Damm | 2cc45cf | 2008-07-16 21:33:39 -0300 | [diff] [blame] | 348 | |
Hans Verkuil | 0b62b73 | 2010-03-28 09:09:05 -0300 | [diff] [blame] | 349 | mem = buf->priv; |
Magnus Damm | 2cc45cf | 2008-07-16 21:33:39 -0300 | [diff] [blame] | 350 | BUG_ON(!mem); |
| 351 | MAGIC_CHECK(mem->magic, MAGIC_DC_MEM); |
| 352 | |
Federico Vaga | a8f3c20 | 2012-04-12 12:39:37 -0300 | [diff] [blame^] | 353 | if (__videobuf_dc_alloc(q->dev, mem, PAGE_ALIGN(buf->bsize), |
| 354 | GFP_KERNEL | __GFP_COMP)) |
Magnus Damm | 2cc45cf | 2008-07-16 21:33:39 -0300 | [diff] [blame] | 355 | goto error; |
Magnus Damm | 2cc45cf | 2008-07-16 21:33:39 -0300 | [diff] [blame] | 356 | |
| 357 | /* Try to remap memory */ |
| 358 | |
| 359 | size = vma->vm_end - vma->vm_start; |
| 360 | size = (size < mem->size) ? size : mem->size; |
| 361 | |
Federico Vaga | a8f3c20 | 2012-04-12 12:39:37 -0300 | [diff] [blame^] | 362 | if (!mem->cached) |
| 363 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); |
| 364 | |
| 365 | pos = (unsigned long)mem->vaddr; |
| 366 | |
| 367 | while (size > 0) { |
| 368 | page = virt_to_page((void *)pos); |
| 369 | if (NULL == page) { |
| 370 | dev_err(q->dev, "mmap: virt_to_page failed\n"); |
| 371 | __videobuf_dc_free(q->dev, mem); |
| 372 | goto error; |
| 373 | } |
| 374 | retval = vm_insert_page(vma, start, page); |
| 375 | if (retval) { |
| 376 | dev_err(q->dev, "mmap: insert failed with error %d\n", |
| 377 | retval); |
| 378 | __videobuf_dc_free(q->dev, mem); |
| 379 | goto error; |
| 380 | } |
| 381 | start += PAGE_SIZE; |
| 382 | pos += PAGE_SIZE; |
| 383 | |
| 384 | if (size > PAGE_SIZE) |
| 385 | size -= PAGE_SIZE; |
| 386 | else |
| 387 | size = 0; |
Magnus Damm | 2cc45cf | 2008-07-16 21:33:39 -0300 | [diff] [blame] | 388 | } |
| 389 | |
Federico Vaga | a8f3c20 | 2012-04-12 12:39:37 -0300 | [diff] [blame^] | 390 | vma->vm_ops = &videobuf_vm_ops; |
| 391 | vma->vm_flags |= VM_DONTEXPAND; |
Magnus Damm | 2cc45cf | 2008-07-16 21:33:39 -0300 | [diff] [blame] | 392 | vma->vm_private_data = map; |
| 393 | |
| 394 | dev_dbg(q->dev, "mmap %p: q=%p %08lx-%08lx (%lx) pgoff %08lx buf %d\n", |
| 395 | map, q, vma->vm_start, vma->vm_end, |
Federico Vaga | a8f3c20 | 2012-04-12 12:39:37 -0300 | [diff] [blame^] | 396 | (long int)buf->bsize, vma->vm_pgoff, buf->i); |
Magnus Damm | 2cc45cf | 2008-07-16 21:33:39 -0300 | [diff] [blame] | 397 | |
| 398 | videobuf_vm_open(vma); |
| 399 | |
| 400 | return 0; |
| 401 | |
| 402 | error: |
| 403 | kfree(map); |
| 404 | return -ENOMEM; |
| 405 | } |
| 406 | |
Magnus Damm | 2cc45cf | 2008-07-16 21:33:39 -0300 | [diff] [blame] | 407 | static struct videobuf_qtype_ops qops = { |
Federico Vaga | a8f3c20 | 2012-04-12 12:39:37 -0300 | [diff] [blame^] | 408 | .magic = MAGIC_QTYPE_OPS, |
| 409 | .alloc_vb = __videobuf_alloc_uncached, |
| 410 | .iolock = __videobuf_iolock, |
| 411 | .mmap_mapper = __videobuf_mmap_mapper, |
| 412 | .vaddr = __videobuf_to_vaddr, |
| 413 | }; |
Magnus Damm | 2cc45cf | 2008-07-16 21:33:39 -0300 | [diff] [blame] | 414 | |
Federico Vaga | a8f3c20 | 2012-04-12 12:39:37 -0300 | [diff] [blame^] | 415 | static struct videobuf_qtype_ops qops_cached = { |
| 416 | .magic = MAGIC_QTYPE_OPS, |
| 417 | .alloc_vb = __videobuf_alloc_cached, |
| 418 | .iolock = __videobuf_iolock, |
| 419 | .sync = __videobuf_sync, |
| 420 | .mmap_mapper = __videobuf_mmap_mapper, |
| 421 | .vaddr = __videobuf_to_vaddr, |
Magnus Damm | 2cc45cf | 2008-07-16 21:33:39 -0300 | [diff] [blame] | 422 | }; |
| 423 | |
| 424 | void videobuf_queue_dma_contig_init(struct videobuf_queue *q, |
Jonathan Corbet | 38a54f3 | 2009-11-17 19:43:41 -0300 | [diff] [blame] | 425 | const struct videobuf_queue_ops *ops, |
Magnus Damm | 2cc45cf | 2008-07-16 21:33:39 -0300 | [diff] [blame] | 426 | struct device *dev, |
| 427 | spinlock_t *irqlock, |
| 428 | enum v4l2_buf_type type, |
| 429 | enum v4l2_field field, |
| 430 | unsigned int msize, |
Hans Verkuil | 08bff03 | 2010-09-20 17:39:46 -0300 | [diff] [blame] | 431 | void *priv, |
| 432 | struct mutex *ext_lock) |
Magnus Damm | 2cc45cf | 2008-07-16 21:33:39 -0300 | [diff] [blame] | 433 | { |
| 434 | videobuf_queue_core_init(q, ops, dev, irqlock, type, field, msize, |
Hans Verkuil | 08bff03 | 2010-09-20 17:39:46 -0300 | [diff] [blame] | 435 | priv, &qops, ext_lock); |
Magnus Damm | 2cc45cf | 2008-07-16 21:33:39 -0300 | [diff] [blame] | 436 | } |
| 437 | EXPORT_SYMBOL_GPL(videobuf_queue_dma_contig_init); |
| 438 | |
Federico Vaga | a8f3c20 | 2012-04-12 12:39:37 -0300 | [diff] [blame^] | 439 | void videobuf_queue_dma_contig_init_cached(struct videobuf_queue *q, |
| 440 | const struct videobuf_queue_ops *ops, |
| 441 | struct device *dev, |
| 442 | spinlock_t *irqlock, |
| 443 | enum v4l2_buf_type type, |
| 444 | enum v4l2_field field, |
| 445 | unsigned int msize, |
| 446 | void *priv, struct mutex *ext_lock) |
| 447 | { |
| 448 | videobuf_queue_core_init(q, ops, dev, irqlock, type, field, msize, |
| 449 | priv, &qops_cached, ext_lock); |
| 450 | } |
| 451 | EXPORT_SYMBOL_GPL(videobuf_queue_dma_contig_init_cached); |
| 452 | |
Magnus Damm | 2cc45cf | 2008-07-16 21:33:39 -0300 | [diff] [blame] | 453 | dma_addr_t videobuf_to_dma_contig(struct videobuf_buffer *buf) |
| 454 | { |
| 455 | struct videobuf_dma_contig_memory *mem = buf->priv; |
| 456 | |
| 457 | BUG_ON(!mem); |
| 458 | MAGIC_CHECK(mem->magic, MAGIC_DC_MEM); |
| 459 | |
| 460 | return mem->dma_handle; |
| 461 | } |
| 462 | EXPORT_SYMBOL_GPL(videobuf_to_dma_contig); |
| 463 | |
| 464 | void videobuf_dma_contig_free(struct videobuf_queue *q, |
| 465 | struct videobuf_buffer *buf) |
| 466 | { |
| 467 | struct videobuf_dma_contig_memory *mem = buf->priv; |
| 468 | |
| 469 | /* mmapped memory can't be freed here, otherwise mmapped region |
| 470 | would be released, while still needed. In this case, the memory |
| 471 | release should happen inside videobuf_vm_close(). |
| 472 | So, it should free memory only if the memory were allocated for |
| 473 | read() operation. |
| 474 | */ |
Magnus Damm | 720b17e | 2009-06-16 15:32:36 -0700 | [diff] [blame] | 475 | if (buf->memory != V4L2_MEMORY_USERPTR) |
Magnus Damm | 2cc45cf | 2008-07-16 21:33:39 -0300 | [diff] [blame] | 476 | return; |
| 477 | |
| 478 | if (!mem) |
| 479 | return; |
| 480 | |
| 481 | MAGIC_CHECK(mem->magic, MAGIC_DC_MEM); |
| 482 | |
Magnus Damm | 720b17e | 2009-06-16 15:32:36 -0700 | [diff] [blame] | 483 | /* handle user space pointer case */ |
| 484 | if (buf->baddr) { |
| 485 | videobuf_dma_contig_user_put(mem); |
| 486 | return; |
| 487 | } |
| 488 | |
| 489 | /* read() method */ |
Pawel Osciak | b2b476f | 2010-07-20 13:49:16 -0300 | [diff] [blame] | 490 | if (mem->vaddr) { |
Federico Vaga | a8f3c20 | 2012-04-12 12:39:37 -0300 | [diff] [blame^] | 491 | __videobuf_dc_free(q->dev, mem); |
Pawel Osciak | b2b476f | 2010-07-20 13:49:16 -0300 | [diff] [blame] | 492 | mem->vaddr = NULL; |
| 493 | } |
Magnus Damm | 2cc45cf | 2008-07-16 21:33:39 -0300 | [diff] [blame] | 494 | } |
| 495 | EXPORT_SYMBOL_GPL(videobuf_dma_contig_free); |
| 496 | |
| 497 | MODULE_DESCRIPTION("helper module to manage video4linux dma contig buffers"); |
| 498 | MODULE_AUTHOR("Magnus Damm"); |
| 499 | MODULE_LICENSE("GPL"); |