Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 1 | /* |
| 2 | * helper functions for vmalloc video4linux capture buffers |
| 3 | * |
Magnus Damm | 5d6aaf5 | 2008-07-16 21:27:49 -0300 | [diff] [blame] | 4 | * The functions expect the hardware being able to scatter gather |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 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 | |
Pawel Osciak | 7a02264 | 2010-03-17 04:01:04 -0300 | [diff] [blame^] | 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 | } |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 39 | |
Douglas Schilling Landgraf | ff699e6 | 2008-04-22 14:41:48 -0300 | [diff] [blame] | 40 | static int debug; |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 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 | |
Pawel Osciak | 7a02264 | 2010-03-17 04:01:04 -0300 | [diff] [blame^] | 47 | #define dprintk(level, fmt, arg...) \ |
| 48 | if (debug >= level) \ |
| 49 | printk(KERN_DEBUG "vbuf-vmalloc: " fmt , ## arg) |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 50 | |
| 51 | |
| 52 | /***************************************************************************/ |
| 53 | |
Pawel Osciak | 7a02264 | 2010-03-17 04:01:04 -0300 | [diff] [blame^] | 54 | static void videobuf_vm_open(struct vm_area_struct *vma) |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 55 | { |
| 56 | struct videobuf_mapping *map = vma->vm_private_data; |
| 57 | |
Pawel Osciak | 7a02264 | 2010-03-17 04:01:04 -0300 | [diff] [blame^] | 58 | dprintk(2, "vm_open %p [count=%u,vma=%08lx-%08lx]\n", map, |
| 59 | map->count, vma->vm_start, vma->vm_end); |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 60 | |
| 61 | map->count++; |
| 62 | } |
| 63 | |
Mauro Carvalho Chehab | aaea56a | 2008-04-13 14:58:43 -0300 | [diff] [blame] | 64 | static void videobuf_vm_close(struct vm_area_struct *vma) |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 65 | { |
| 66 | struct videobuf_mapping *map = vma->vm_private_data; |
| 67 | struct videobuf_queue *q = map->q; |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 68 | int i; |
| 69 | |
Pawel Osciak | 7a02264 | 2010-03-17 04:01:04 -0300 | [diff] [blame^] | 70 | dprintk(2, "vm_close %p [count=%u,vma=%08lx-%08lx]\n", map, |
Mauro Carvalho Chehab | aaea56a | 2008-04-13 14:58:43 -0300 | [diff] [blame] | 71 | map->count, vma->vm_start, vma->vm_end); |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 72 | |
| 73 | map->count--; |
| 74 | if (0 == map->count) { |
Mauro Carvalho Chehab | aaea56a | 2008-04-13 14:58:43 -0300 | [diff] [blame] | 75 | struct videobuf_vmalloc_memory *mem; |
| 76 | |
| 77 | dprintk(1, "munmap %p q=%p\n", map, q); |
Mauro Carvalho Chehab | 64f9477 | 2008-01-31 13:57:53 -0300 | [diff] [blame] | 78 | mutex_lock(&q->vb_lock); |
Mauro Carvalho Chehab | aa9479e | 2008-04-13 15:07:56 -0300 | [diff] [blame] | 79 | |
| 80 | /* We need first to cancel streams, before unmapping */ |
| 81 | if (q->streaming) |
| 82 | videobuf_queue_cancel(q); |
| 83 | |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 84 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { |
| 85 | if (NULL == q->bufs[i]) |
| 86 | continue; |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 87 | |
Mauro Carvalho Chehab | 851c0c9 | 2007-09-27 18:25:44 -0300 | [diff] [blame] | 88 | if (q->bufs[i]->map != map) |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 89 | continue; |
Mauro Carvalho Chehab | 123f8ef | 2007-09-06 20:11:35 -0300 | [diff] [blame] | 90 | |
Mauro Carvalho Chehab | aaea56a | 2008-04-13 14:58:43 -0300 | [diff] [blame] | 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 | */ |
Mauro Carvalho Chehab | aa9479e | 2008-04-13 15:07:56 -0300 | [diff] [blame] | 98 | |
Mauro Carvalho Chehab | aaea56a | 2008-04-13 14:58:43 -0300 | [diff] [blame] | 99 | MAGIC_CHECK(mem->magic, MAGIC_VMAL_MEM); |
Mauro Carvalho Chehab | aa9479e | 2008-04-13 15:07:56 -0300 | [diff] [blame] | 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", |
| 105 | __func__, i, mem->vmalloc); |
| 106 | |
Mauro Carvalho Chehab | aaea56a | 2008-04-13 14:58:43 -0300 | [diff] [blame] | 107 | vfree(mem->vmalloc); |
| 108 | mem->vmalloc = NULL; |
| 109 | } |
| 110 | |
Mauro Carvalho Chehab | 851c0c9 | 2007-09-27 18:25:44 -0300 | [diff] [blame] | 111 | q->bufs[i]->map = NULL; |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 112 | q->bufs[i]->baddr = 0; |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 113 | } |
Mauro Carvalho Chehab | aa9479e | 2008-04-13 15:07:56 -0300 | [diff] [blame] | 114 | |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 115 | kfree(map); |
Mauro Carvalho Chehab | aa9479e | 2008-04-13 15:07:56 -0300 | [diff] [blame] | 116 | |
| 117 | mutex_unlock(&q->vb_lock); |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 118 | } |
Mauro Carvalho Chehab | aa9479e | 2008-04-13 15:07:56 -0300 | [diff] [blame] | 119 | |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 120 | return; |
| 121 | } |
| 122 | |
Pawel Osciak | 7a02264 | 2010-03-17 04:01:04 -0300 | [diff] [blame^] | 123 | static const struct vm_operations_struct videobuf_vm_ops = { |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 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, ...) |
Guennadi Liakhovetski | 0705135 | 2008-04-22 14:42:13 -0300 | [diff] [blame] | 135 | struct videobuf_dma_sg_memory |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 136 | */ |
| 137 | |
| 138 | static void *__videobuf_alloc(size_t size) |
| 139 | { |
Brandon Philips | 384b835 | 2008-02-04 20:52:21 -0300 | [diff] [blame] | 140 | struct videobuf_vmalloc_memory *mem; |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 141 | struct videobuf_buffer *vb; |
| 142 | |
Pawel Osciak | 7a02264 | 2010-03-17 04:01:04 -0300 | [diff] [blame^] | 143 | vb = kzalloc(size + sizeof(*mem), GFP_KERNEL); |
Pawel Osciak | bee527f | 2010-02-22 13:10:06 -0300 | [diff] [blame] | 144 | if (!vb) |
| 145 | return vb; |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 146 | |
Pawel Osciak | 7a02264 | 2010-03-17 04:01:04 -0300 | [diff] [blame^] | 147 | mem = vb->priv = ((char *)vb) + size; |
| 148 | mem->magic = MAGIC_VMAL_MEM; |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 149 | |
Pawel Osciak | 7a02264 | 2010-03-17 04:01:04 -0300 | [diff] [blame^] | 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)); |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 153 | |
| 154 | return vb; |
| 155 | } |
| 156 | |
Pawel Osciak | 7a02264 | 2010-03-17 04:01:04 -0300 | [diff] [blame^] | 157 | static int __videobuf_iolock(struct videobuf_queue *q, |
| 158 | struct videobuf_buffer *vb, |
| 159 | struct v4l2_framebuffer *fbuf) |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 160 | { |
Mauro Carvalho Chehab | 968ced7 | 2008-04-13 14:58:21 -0300 | [diff] [blame] | 161 | struct videobuf_vmalloc_memory *mem = vb->priv; |
Mauro Carvalho Chehab | aa9479e | 2008-04-13 15:07:56 -0300 | [diff] [blame] | 162 | int pages; |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 163 | |
| 164 | BUG_ON(!mem); |
| 165 | |
Mauro Carvalho Chehab | 968ced7 | 2008-04-13 14:58:21 -0300 | [diff] [blame] | 166 | MAGIC_CHECK(mem->magic, MAGIC_VMAL_MEM); |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 167 | |
Mauro Carvalho Chehab | 968ced7 | 2008-04-13 14:58:21 -0300 | [diff] [blame] | 168 | switch (vb->memory) { |
| 169 | case V4L2_MEMORY_MMAP: |
| 170 | dprintk(1, "%s memory method MMAP\n", __func__); |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 171 | |
Mauro Carvalho Chehab | 968ced7 | 2008-04-13 14:58:21 -0300 | [diff] [blame] | 172 | /* All handling should be done by __videobuf_mmap_mapper() */ |
| 173 | if (!mem->vmalloc) { |
| 174 | printk(KERN_ERR "memory is not alloced/mmapped.\n"); |
| 175 | return -EINVAL; |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 176 | } |
Mauro Carvalho Chehab | 968ced7 | 2008-04-13 14:58:21 -0300 | [diff] [blame] | 177 | break; |
| 178 | case V4L2_MEMORY_USERPTR: |
Mauro Carvalho Chehab | aa9479e | 2008-04-13 15:07:56 -0300 | [diff] [blame] | 179 | pages = PAGE_ALIGN(vb->size); |
Mauro Carvalho Chehab | 968ced7 | 2008-04-13 14:58:21 -0300 | [diff] [blame] | 180 | |
| 181 | dprintk(1, "%s memory method USERPTR\n", __func__); |
| 182 | |
Mauro Carvalho Chehab | 968ced7 | 2008-04-13 14:58:21 -0300 | [diff] [blame] | 183 | if (vb->baddr) { |
| 184 | printk(KERN_ERR "USERPTR is currently not supported\n"); |
| 185 | return -EINVAL; |
| 186 | } |
Mauro Carvalho Chehab | 968ced7 | 2008-04-13 14:58:21 -0300 | [diff] [blame] | 187 | |
| 188 | /* The only USERPTR currently supported is the one needed for |
Pawel Osciak | 7a02264 | 2010-03-17 04:01:04 -0300 | [diff] [blame^] | 189 | * read() method. |
Mauro Carvalho Chehab | 968ced7 | 2008-04-13 14:58:21 -0300 | [diff] [blame] | 190 | */ |
| 191 | |
| 192 | mem->vmalloc = vmalloc_user(pages); |
| 193 | if (!mem->vmalloc) { |
| 194 | printk(KERN_ERR "vmalloc (%d pages) failed\n", pages); |
| 195 | return -ENOMEM; |
| 196 | } |
| 197 | dprintk(1, "vmalloc is at addr %p (%d pages)\n", |
| 198 | mem->vmalloc, pages); |
| 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. |
Hans Verkuil | de1e575 | 2008-07-26 08:37:58 -0300 | [diff] [blame] | 209 | The code below won't work, since mem->vma = NULL |
Mauro Carvalho Chehab | 968ced7 | 2008-04-13 14:58:21 -0300 | [diff] [blame] | 210 | */ |
| 211 | /* Try to remap memory */ |
| 212 | rc = remap_vmalloc_range(mem->vma, (void *)vb->baddr, 0); |
| 213 | if (rc < 0) { |
Pawel Osciak | 7a02264 | 2010-03-17 04:01:04 -0300 | [diff] [blame^] | 214 | printk(KERN_ERR "mmap: remap failed with error %d", rc); |
Mauro Carvalho Chehab | 968ced7 | 2008-04-13 14:58:21 -0300 | [diff] [blame] | 215 | return -ENOMEM; |
| 216 | } |
| 217 | #endif |
| 218 | |
| 219 | break; |
Mauro Carvalho Chehab | 968ced7 | 2008-04-13 14:58:21 -0300 | [diff] [blame] | 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; |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 227 | } |
| 228 | |
| 229 | return 0; |
| 230 | } |
| 231 | |
| 232 | static int __videobuf_sync(struct videobuf_queue *q, |
| 233 | struct videobuf_buffer *buf) |
| 234 | { |
| 235 | return 0; |
| 236 | } |
| 237 | |
| 238 | static int __videobuf_mmap_free(struct videobuf_queue *q) |
| 239 | { |
| 240 | unsigned int i; |
| 241 | |
Mauro Carvalho Chehab | 968ced7 | 2008-04-13 14:58:21 -0300 | [diff] [blame] | 242 | dprintk(1, "%s\n", __func__); |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 243 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { |
| 244 | if (q->bufs[i]) { |
Mauro Carvalho Chehab | 851c0c9 | 2007-09-27 18:25:44 -0300 | [diff] [blame] | 245 | if (q->bufs[i]->map) |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 246 | return -EBUSY; |
| 247 | } |
| 248 | } |
| 249 | |
| 250 | return 0; |
| 251 | } |
| 252 | |
| 253 | static int __videobuf_mmap_mapper(struct videobuf_queue *q, |
| 254 | struct vm_area_struct *vma) |
| 255 | { |
Brandon Philips | 384b835 | 2008-02-04 20:52:21 -0300 | [diff] [blame] | 256 | struct videobuf_vmalloc_memory *mem; |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 257 | struct videobuf_mapping *map; |
| 258 | unsigned int first; |
Mauro Carvalho Chehab | 968ced7 | 2008-04-13 14:58:21 -0300 | [diff] [blame] | 259 | int retval, pages; |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 260 | unsigned long offset = vma->vm_pgoff << PAGE_SHIFT; |
| 261 | |
Mauro Carvalho Chehab | 968ced7 | 2008-04-13 14:58:21 -0300 | [diff] [blame] | 262 | dprintk(1, "%s\n", __func__); |
| 263 | if (!(vma->vm_flags & VM_WRITE) || !(vma->vm_flags & VM_SHARED)) |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 264 | return -EINVAL; |
| 265 | |
| 266 | /* look for first buffer to map */ |
| 267 | for (first = 0; first < VIDEO_MAX_FRAME; first++) { |
| 268 | if (NULL == q->bufs[first]) |
| 269 | continue; |
| 270 | |
| 271 | if (V4L2_MEMORY_MMAP != q->bufs[first]->memory) |
| 272 | continue; |
| 273 | if (q->bufs[first]->boff == offset) |
| 274 | break; |
| 275 | } |
| 276 | if (VIDEO_MAX_FRAME == first) { |
Pawel Osciak | 7a02264 | 2010-03-17 04:01:04 -0300 | [diff] [blame^] | 277 | dprintk(1, "mmap app bug: offset invalid [offset=0x%lx]\n", |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 278 | (vma->vm_pgoff << PAGE_SHIFT)); |
| 279 | return -EINVAL; |
| 280 | } |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 281 | |
| 282 | /* create mapping + update buffer list */ |
Mauro Carvalho Chehab | 968ced7 | 2008-04-13 14:58:21 -0300 | [diff] [blame] | 283 | map = kzalloc(sizeof(struct videobuf_mapping), GFP_KERNEL); |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 284 | if (NULL == map) |
| 285 | return -ENOMEM; |
| 286 | |
Mauro Carvalho Chehab | 968ced7 | 2008-04-13 14:58:21 -0300 | [diff] [blame] | 287 | q->bufs[first]->map = map; |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 288 | map->start = vma->vm_start; |
| 289 | map->end = vma->vm_end; |
| 290 | map->q = q; |
| 291 | |
| 292 | q->bufs[first]->baddr = vma->vm_start; |
| 293 | |
Mauro Carvalho Chehab | 968ced7 | 2008-04-13 14:58:21 -0300 | [diff] [blame] | 294 | mem = q->bufs[first]->priv; |
| 295 | BUG_ON(!mem); |
| 296 | MAGIC_CHECK(mem->magic, MAGIC_VMAL_MEM); |
| 297 | |
| 298 | pages = PAGE_ALIGN(vma->vm_end - vma->vm_start); |
| 299 | mem->vmalloc = vmalloc_user(pages); |
| 300 | if (!mem->vmalloc) { |
| 301 | printk(KERN_ERR "vmalloc (%d pages) failed\n", pages); |
| 302 | goto error; |
| 303 | } |
Pawel Osciak | 7a02264 | 2010-03-17 04:01:04 -0300 | [diff] [blame^] | 304 | dprintk(1, "vmalloc is at addr %p (%d pages)\n", mem->vmalloc, pages); |
Mauro Carvalho Chehab | 968ced7 | 2008-04-13 14:58:21 -0300 | [diff] [blame] | 305 | |
| 306 | /* Try to remap memory */ |
| 307 | retval = remap_vmalloc_range(vma, mem->vmalloc, 0); |
| 308 | if (retval < 0) { |
| 309 | printk(KERN_ERR "mmap: remap failed with error %d. ", retval); |
| 310 | vfree(mem->vmalloc); |
| 311 | goto error; |
| 312 | } |
| 313 | |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 314 | vma->vm_ops = &videobuf_vm_ops; |
| 315 | vma->vm_flags |= VM_DONTEXPAND | VM_RESERVED; |
| 316 | vma->vm_private_data = map; |
| 317 | |
Pawel Osciak | 7a02264 | 2010-03-17 04:01:04 -0300 | [diff] [blame^] | 318 | dprintk(1, "mmap %p: q=%p %08lx-%08lx (%lx) pgoff %08lx buf %d\n", |
Mauro Carvalho Chehab | 968ced7 | 2008-04-13 14:58:21 -0300 | [diff] [blame] | 319 | map, q, vma->vm_start, vma->vm_end, |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 320 | (long int) q->bufs[first]->bsize, |
Mauro Carvalho Chehab | 968ced7 | 2008-04-13 14:58:21 -0300 | [diff] [blame] | 321 | vma->vm_pgoff, first); |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 322 | |
| 323 | videobuf_vm_open(vma); |
| 324 | |
Mauro Carvalho Chehab | 968ced7 | 2008-04-13 14:58:21 -0300 | [diff] [blame] | 325 | return 0; |
| 326 | |
| 327 | error: |
| 328 | mem = NULL; |
| 329 | kfree(map); |
| 330 | return -ENOMEM; |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 331 | } |
| 332 | |
Pawel Osciak | 7a02264 | 2010-03-17 04:01:04 -0300 | [diff] [blame^] | 333 | static int __videobuf_copy_to_user(struct videobuf_queue *q, |
| 334 | char __user *data, size_t count, |
| 335 | int nonblocking) |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 336 | { |
Pawel Osciak | 7a02264 | 2010-03-17 04:01:04 -0300 | [diff] [blame^] | 337 | struct videobuf_vmalloc_memory *mem = q->read_buf->priv; |
| 338 | BUG_ON(!mem); |
| 339 | MAGIC_CHECK(mem->magic, MAGIC_VMAL_MEM); |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 340 | |
Pawel Osciak | 7a02264 | 2010-03-17 04:01:04 -0300 | [diff] [blame^] | 341 | BUG_ON(!mem->vmalloc); |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 342 | |
| 343 | /* copy to userspace */ |
| 344 | if (count > q->read_buf->size - q->read_off) |
| 345 | count = q->read_buf->size - q->read_off; |
| 346 | |
| 347 | if (copy_to_user(data, mem->vmalloc+q->read_off, count)) |
| 348 | return -EFAULT; |
| 349 | |
| 350 | return count; |
| 351 | } |
| 352 | |
Pawel Osciak | 7a02264 | 2010-03-17 04:01:04 -0300 | [diff] [blame^] | 353 | static int __videobuf_copy_stream(struct videobuf_queue *q, |
| 354 | char __user *data, size_t count, size_t pos, |
| 355 | int vbihack, int nonblocking) |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 356 | { |
Pawel Osciak | 7a02264 | 2010-03-17 04:01:04 -0300 | [diff] [blame^] | 357 | unsigned int *fc; |
| 358 | struct videobuf_vmalloc_memory *mem = q->read_buf->priv; |
| 359 | BUG_ON(!mem); |
| 360 | MAGIC_CHECK(mem->magic, MAGIC_VMAL_MEM); |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 361 | |
| 362 | if (vbihack) { |
| 363 | /* dirty, undocumented hack -- pass the frame counter |
| 364 | * within the last four bytes of each vbi data block. |
| 365 | * We need that one to maintain backward compatibility |
| 366 | * to all vbi decoding software out there ... */ |
Pawel Osciak | 7a02264 | 2010-03-17 04:01:04 -0300 | [diff] [blame^] | 367 | fc = (unsigned int *)mem->vmalloc; |
| 368 | fc += (q->read_buf->size >> 2) - 1; |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 369 | *fc = q->read_buf->field_count >> 1; |
Pawel Osciak | 7a02264 | 2010-03-17 04:01:04 -0300 | [diff] [blame^] | 370 | dprintk(1, "vbihack: %d\n", *fc); |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 371 | } |
| 372 | |
| 373 | /* copy stuff using the common method */ |
Pawel Osciak | 7a02264 | 2010-03-17 04:01:04 -0300 | [diff] [blame^] | 374 | count = __videobuf_copy_to_user(q, data, count, nonblocking); |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 375 | |
Pawel Osciak | 7a02264 | 2010-03-17 04:01:04 -0300 | [diff] [blame^] | 376 | if ((count == -EFAULT) && (0 == pos)) |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 377 | return -EFAULT; |
| 378 | |
| 379 | return count; |
| 380 | } |
| 381 | |
| 382 | static struct videobuf_qtype_ops qops = { |
| 383 | .magic = MAGIC_QTYPE_OPS, |
| 384 | |
| 385 | .alloc = __videobuf_alloc, |
| 386 | .iolock = __videobuf_iolock, |
| 387 | .sync = __videobuf_sync, |
| 388 | .mmap_free = __videobuf_mmap_free, |
| 389 | .mmap_mapper = __videobuf_mmap_mapper, |
Al Viro | 13bcd5d | 2007-10-13 08:25:24 +0100 | [diff] [blame] | 390 | .video_copy_to_user = __videobuf_copy_to_user, |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 391 | .copy_stream = __videobuf_copy_stream, |
Mauro Carvalho Chehab | 59d3448 | 2008-04-13 15:10:00 -0300 | [diff] [blame] | 392 | .vmalloc = videobuf_to_vmalloc, |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 393 | }; |
| 394 | |
Pawel Osciak | 7a02264 | 2010-03-17 04:01:04 -0300 | [diff] [blame^] | 395 | void videobuf_queue_vmalloc_init(struct videobuf_queue *q, |
Jonathan Corbet | 38a54f3 | 2009-11-17 19:43:41 -0300 | [diff] [blame] | 396 | const struct videobuf_queue_ops *ops, |
Jonathan Corbet | f8b0bca | 2009-11-23 14:29:35 -0300 | [diff] [blame] | 397 | struct device *dev, |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 398 | spinlock_t *irqlock, |
| 399 | enum v4l2_buf_type type, |
| 400 | enum v4l2_field field, |
| 401 | unsigned int msize, |
| 402 | void *priv) |
| 403 | { |
Mauro Carvalho Chehab | d4cae5a | 2007-10-08 12:20:02 -0300 | [diff] [blame] | 404 | videobuf_queue_core_init(q, ops, dev, irqlock, type, field, msize, |
| 405 | priv, &qops); |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 406 | } |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 407 | EXPORT_SYMBOL_GPL(videobuf_queue_vmalloc_init); |
| 408 | |
Pawel Osciak | 7a02264 | 2010-03-17 04:01:04 -0300 | [diff] [blame^] | 409 | void *videobuf_to_vmalloc(struct videobuf_buffer *buf) |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 410 | { |
Pawel Osciak | 7a02264 | 2010-03-17 04:01:04 -0300 | [diff] [blame^] | 411 | struct videobuf_vmalloc_memory *mem = buf->priv; |
| 412 | BUG_ON(!mem); |
| 413 | MAGIC_CHECK(mem->magic, MAGIC_VMAL_MEM); |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 414 | |
| 415 | return mem->vmalloc; |
| 416 | } |
| 417 | EXPORT_SYMBOL_GPL(videobuf_to_vmalloc); |
| 418 | |
Pawel Osciak | 7a02264 | 2010-03-17 04:01:04 -0300 | [diff] [blame^] | 419 | void videobuf_vmalloc_free(struct videobuf_buffer *buf) |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 420 | { |
Mauro Carvalho Chehab | 968ced7 | 2008-04-13 14:58:21 -0300 | [diff] [blame] | 421 | struct videobuf_vmalloc_memory *mem = buf->priv; |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 422 | |
Mauro Carvalho Chehab | aaea56a | 2008-04-13 14:58:43 -0300 | [diff] [blame] | 423 | /* mmapped memory can't be freed here, otherwise mmapped region |
| 424 | would be released, while still needed. In this case, the memory |
| 425 | release should happen inside videobuf_vm_close(). |
| 426 | So, it should free memory only if the memory were allocated for |
| 427 | read() operation. |
| 428 | */ |
Mauro Carvalho Chehab | 5993a66 | 2009-01-23 21:35:12 -0300 | [diff] [blame] | 429 | if ((buf->memory != V4L2_MEMORY_USERPTR) || buf->baddr) |
Mauro Carvalho Chehab | aaea56a | 2008-04-13 14:58:43 -0300 | [diff] [blame] | 430 | return; |
| 431 | |
Mauro Carvalho Chehab | 968ced7 | 2008-04-13 14:58:21 -0300 | [diff] [blame] | 432 | if (!mem) |
| 433 | return; |
| 434 | |
| 435 | MAGIC_CHECK(mem->magic, MAGIC_VMAL_MEM); |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 436 | |
| 437 | vfree(mem->vmalloc); |
Mauro Carvalho Chehab | 968ced7 | 2008-04-13 14:58:21 -0300 | [diff] [blame] | 438 | mem->vmalloc = NULL; |
| 439 | |
Mauro Carvalho Chehab | 87b9ad0 | 2007-08-02 23:31:33 -0300 | [diff] [blame] | 440 | return; |
| 441 | } |
| 442 | EXPORT_SYMBOL_GPL(videobuf_vmalloc_free); |
| 443 | |