Pawel Osciak | 1a758d4 | 2010-10-11 10:59:36 -0300 | [diff] [blame] | 1 | /* |
| 2 | * videobuf2-dma-contig.c - DMA contig memory allocator for videobuf2 |
| 3 | * |
| 4 | * Copyright (C) 2010 Samsung Electronics |
| 5 | * |
Pawel Osciak | 9507208 | 2011-03-13 15:23:32 -0300 | [diff] [blame] | 6 | * Author: Pawel Osciak <pawel@osciak.com> |
Pawel Osciak | 1a758d4 | 2010-10-11 10:59:36 -0300 | [diff] [blame] | 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation. |
| 11 | */ |
| 12 | |
Sumit Semwal | 8c417d0 | 2012-06-14 10:37:45 -0300 | [diff] [blame] | 13 | #include <linux/dma-buf.h> |
Pawel Osciak | 1a758d4 | 2010-10-11 10:59:36 -0300 | [diff] [blame] | 14 | #include <linux/module.h> |
Tomasz Stanislawski | e15dab7 | 2012-06-14 10:37:42 -0300 | [diff] [blame] | 15 | #include <linux/scatterlist.h> |
| 16 | #include <linux/sched.h> |
Pawel Osciak | 1a758d4 | 2010-10-11 10:59:36 -0300 | [diff] [blame] | 17 | #include <linux/slab.h> |
| 18 | #include <linux/dma-mapping.h> |
| 19 | |
| 20 | #include <media/videobuf2-core.h> |
H Hartley Sweeten | d0df3c3 | 2012-04-24 19:08:12 -0300 | [diff] [blame] | 21 | #include <media/videobuf2-dma-contig.h> |
Pawel Osciak | 1a758d4 | 2010-10-11 10:59:36 -0300 | [diff] [blame] | 22 | #include <media/videobuf2-memops.h> |
| 23 | |
| 24 | struct vb2_dc_conf { |
| 25 | struct device *dev; |
| 26 | }; |
| 27 | |
| 28 | struct vb2_dc_buf { |
Tomasz Stanislawski | 72f86bf | 2012-06-14 10:37:40 -0300 | [diff] [blame] | 29 | struct device *dev; |
Pawel Osciak | 1a758d4 | 2010-10-11 10:59:36 -0300 | [diff] [blame] | 30 | void *vaddr; |
Pawel Osciak | 1a758d4 | 2010-10-11 10:59:36 -0300 | [diff] [blame] | 31 | unsigned long size; |
Laurent Pinchart | 40d8b76 | 2012-06-14 10:37:41 -0300 | [diff] [blame] | 32 | dma_addr_t dma_addr; |
Tomasz Stanislawski | e15dab7 | 2012-06-14 10:37:42 -0300 | [diff] [blame] | 33 | enum dma_data_direction dma_dir; |
| 34 | struct sg_table *dma_sgt; |
Laurent Pinchart | 40d8b76 | 2012-06-14 10:37:41 -0300 | [diff] [blame] | 35 | |
| 36 | /* MMAP related */ |
Pawel Osciak | 1a758d4 | 2010-10-11 10:59:36 -0300 | [diff] [blame] | 37 | struct vb2_vmarea_handler handler; |
Laurent Pinchart | 40d8b76 | 2012-06-14 10:37:41 -0300 | [diff] [blame] | 38 | atomic_t refcount; |
Tomasz Stanislawski | 9ef2cbe | 2012-06-14 11:32:25 -0300 | [diff] [blame] | 39 | struct sg_table *sgt_base; |
Laurent Pinchart | 40d8b76 | 2012-06-14 10:37:41 -0300 | [diff] [blame] | 40 | |
| 41 | /* USERPTR related */ |
| 42 | struct vm_area_struct *vma; |
Sumit Semwal | 8c417d0 | 2012-06-14 10:37:45 -0300 | [diff] [blame] | 43 | |
| 44 | /* DMABUF related */ |
| 45 | struct dma_buf_attachment *db_attach; |
Pawel Osciak | 1a758d4 | 2010-10-11 10:59:36 -0300 | [diff] [blame] | 46 | }; |
| 47 | |
Laurent Pinchart | 40d8b76 | 2012-06-14 10:37:41 -0300 | [diff] [blame] | 48 | /*********************************************/ |
Tomasz Stanislawski | e15dab7 | 2012-06-14 10:37:42 -0300 | [diff] [blame] | 49 | /* scatterlist table functions */ |
| 50 | /*********************************************/ |
| 51 | |
| 52 | |
| 53 | static void vb2_dc_sgt_foreach_page(struct sg_table *sgt, |
| 54 | void (*cb)(struct page *pg)) |
| 55 | { |
| 56 | struct scatterlist *s; |
| 57 | unsigned int i; |
| 58 | |
| 59 | for_each_sg(sgt->sgl, s, sgt->orig_nents, i) { |
| 60 | struct page *page = sg_page(s); |
| 61 | unsigned int n_pages = PAGE_ALIGN(s->offset + s->length) |
| 62 | >> PAGE_SHIFT; |
| 63 | unsigned int j; |
| 64 | |
| 65 | for (j = 0; j < n_pages; ++j, ++page) |
| 66 | cb(page); |
| 67 | } |
| 68 | } |
| 69 | |
| 70 | static unsigned long vb2_dc_get_contiguous_size(struct sg_table *sgt) |
| 71 | { |
| 72 | struct scatterlist *s; |
| 73 | dma_addr_t expected = sg_dma_address(sgt->sgl); |
| 74 | unsigned int i; |
| 75 | unsigned long size = 0; |
| 76 | |
| 77 | for_each_sg(sgt->sgl, s, sgt->nents, i) { |
| 78 | if (sg_dma_address(s) != expected) |
| 79 | break; |
| 80 | expected = sg_dma_address(s) + sg_dma_len(s); |
| 81 | size += sg_dma_len(s); |
| 82 | } |
| 83 | return size; |
| 84 | } |
| 85 | |
| 86 | /*********************************************/ |
Laurent Pinchart | 40d8b76 | 2012-06-14 10:37:41 -0300 | [diff] [blame] | 87 | /* callbacks for all buffers */ |
| 88 | /*********************************************/ |
| 89 | |
| 90 | static void *vb2_dc_cookie(void *buf_priv) |
| 91 | { |
| 92 | struct vb2_dc_buf *buf = buf_priv; |
| 93 | |
| 94 | return &buf->dma_addr; |
| 95 | } |
| 96 | |
| 97 | static void *vb2_dc_vaddr(void *buf_priv) |
| 98 | { |
| 99 | struct vb2_dc_buf *buf = buf_priv; |
| 100 | |
| 101 | return buf->vaddr; |
| 102 | } |
| 103 | |
| 104 | static unsigned int vb2_dc_num_users(void *buf_priv) |
| 105 | { |
| 106 | struct vb2_dc_buf *buf = buf_priv; |
| 107 | |
| 108 | return atomic_read(&buf->refcount); |
| 109 | } |
| 110 | |
Marek Szyprowski | 199d101 | 2012-06-14 10:37:44 -0300 | [diff] [blame] | 111 | static void vb2_dc_prepare(void *buf_priv) |
| 112 | { |
| 113 | struct vb2_dc_buf *buf = buf_priv; |
| 114 | struct sg_table *sgt = buf->dma_sgt; |
| 115 | |
Sumit Semwal | 8c417d0 | 2012-06-14 10:37:45 -0300 | [diff] [blame] | 116 | /* DMABUF exporter will flush the cache for us */ |
| 117 | if (!sgt || buf->db_attach) |
Marek Szyprowski | 199d101 | 2012-06-14 10:37:44 -0300 | [diff] [blame] | 118 | return; |
| 119 | |
| 120 | dma_sync_sg_for_device(buf->dev, sgt->sgl, sgt->nents, buf->dma_dir); |
| 121 | } |
| 122 | |
| 123 | static void vb2_dc_finish(void *buf_priv) |
| 124 | { |
| 125 | struct vb2_dc_buf *buf = buf_priv; |
| 126 | struct sg_table *sgt = buf->dma_sgt; |
| 127 | |
Sumit Semwal | 8c417d0 | 2012-06-14 10:37:45 -0300 | [diff] [blame] | 128 | /* DMABUF exporter will flush the cache for us */ |
| 129 | if (!sgt || buf->db_attach) |
Marek Szyprowski | 199d101 | 2012-06-14 10:37:44 -0300 | [diff] [blame] | 130 | return; |
| 131 | |
| 132 | dma_sync_sg_for_cpu(buf->dev, sgt->sgl, sgt->nents, buf->dma_dir); |
| 133 | } |
| 134 | |
Laurent Pinchart | 40d8b76 | 2012-06-14 10:37:41 -0300 | [diff] [blame] | 135 | /*********************************************/ |
| 136 | /* callbacks for MMAP buffers */ |
| 137 | /*********************************************/ |
| 138 | |
| 139 | static void vb2_dc_put(void *buf_priv) |
| 140 | { |
| 141 | struct vb2_dc_buf *buf = buf_priv; |
| 142 | |
| 143 | if (!atomic_dec_and_test(&buf->refcount)) |
| 144 | return; |
| 145 | |
Tomasz Stanislawski | 9ef2cbe | 2012-06-14 11:32:25 -0300 | [diff] [blame] | 146 | if (buf->sgt_base) { |
| 147 | sg_free_table(buf->sgt_base); |
| 148 | kfree(buf->sgt_base); |
| 149 | } |
Laurent Pinchart | 40d8b76 | 2012-06-14 10:37:41 -0300 | [diff] [blame] | 150 | dma_free_coherent(buf->dev, buf->size, buf->vaddr, buf->dma_addr); |
Tomasz Stanislawski | 67a5d0c | 2012-08-07 13:19:49 -0300 | [diff] [blame] | 151 | put_device(buf->dev); |
Laurent Pinchart | 40d8b76 | 2012-06-14 10:37:41 -0300 | [diff] [blame] | 152 | kfree(buf); |
| 153 | } |
Pawel Osciak | 1a758d4 | 2010-10-11 10:59:36 -0300 | [diff] [blame] | 154 | |
Hans Verkuil | b6ba205 | 2013-03-01 15:44:20 -0300 | [diff] [blame] | 155 | static void *vb2_dc_alloc(void *alloc_ctx, unsigned long size, gfp_t gfp_flags) |
Pawel Osciak | 1a758d4 | 2010-10-11 10:59:36 -0300 | [diff] [blame] | 156 | { |
| 157 | struct vb2_dc_conf *conf = alloc_ctx; |
Tomasz Stanislawski | 72f86bf | 2012-06-14 10:37:40 -0300 | [diff] [blame] | 158 | struct device *dev = conf->dev; |
Pawel Osciak | 1a758d4 | 2010-10-11 10:59:36 -0300 | [diff] [blame] | 159 | struct vb2_dc_buf *buf; |
| 160 | |
| 161 | buf = kzalloc(sizeof *buf, GFP_KERNEL); |
| 162 | if (!buf) |
| 163 | return ERR_PTR(-ENOMEM); |
| 164 | |
Hans Verkuil | b6ba205 | 2013-03-01 15:44:20 -0300 | [diff] [blame] | 165 | buf->vaddr = dma_alloc_coherent(dev, size, &buf->dma_addr, |
| 166 | GFP_KERNEL | gfp_flags); |
Pawel Osciak | 1a758d4 | 2010-10-11 10:59:36 -0300 | [diff] [blame] | 167 | if (!buf->vaddr) { |
Tomasz Stanislawski | 72f86bf | 2012-06-14 10:37:40 -0300 | [diff] [blame] | 168 | dev_err(dev, "dma_alloc_coherent of size %ld failed\n", size); |
Pawel Osciak | 1a758d4 | 2010-10-11 10:59:36 -0300 | [diff] [blame] | 169 | kfree(buf); |
| 170 | return ERR_PTR(-ENOMEM); |
| 171 | } |
| 172 | |
Tomasz Stanislawski | 67a5d0c | 2012-08-07 13:19:49 -0300 | [diff] [blame] | 173 | /* Prevent the device from being released while the buffer is used */ |
| 174 | buf->dev = get_device(dev); |
Pawel Osciak | 1a758d4 | 2010-10-11 10:59:36 -0300 | [diff] [blame] | 175 | buf->size = size; |
| 176 | |
| 177 | buf->handler.refcount = &buf->refcount; |
Laurent Pinchart | f7f129c | 2012-06-14 10:37:39 -0300 | [diff] [blame] | 178 | buf->handler.put = vb2_dc_put; |
Pawel Osciak | 1a758d4 | 2010-10-11 10:59:36 -0300 | [diff] [blame] | 179 | buf->handler.arg = buf; |
| 180 | |
| 181 | atomic_inc(&buf->refcount); |
| 182 | |
| 183 | return buf; |
| 184 | } |
| 185 | |
Laurent Pinchart | f7f129c | 2012-06-14 10:37:39 -0300 | [diff] [blame] | 186 | static int vb2_dc_mmap(void *buf_priv, struct vm_area_struct *vma) |
Pawel Osciak | 1a758d4 | 2010-10-11 10:59:36 -0300 | [diff] [blame] | 187 | { |
| 188 | struct vb2_dc_buf *buf = buf_priv; |
Marek Szyprowski | c60520f | 2012-06-14 11:32:21 -0300 | [diff] [blame] | 189 | int ret; |
Pawel Osciak | 1a758d4 | 2010-10-11 10:59:36 -0300 | [diff] [blame] | 190 | |
| 191 | if (!buf) { |
| 192 | printk(KERN_ERR "No buffer to map\n"); |
| 193 | return -EINVAL; |
| 194 | } |
| 195 | |
Marek Szyprowski | c60520f | 2012-06-14 11:32:21 -0300 | [diff] [blame] | 196 | /* |
| 197 | * dma_mmap_* uses vm_pgoff as in-buffer offset, but we want to |
| 198 | * map whole buffer |
| 199 | */ |
| 200 | vma->vm_pgoff = 0; |
| 201 | |
| 202 | ret = dma_mmap_coherent(buf->dev, vma, buf->vaddr, |
| 203 | buf->dma_addr, buf->size); |
| 204 | |
| 205 | if (ret) { |
| 206 | pr_err("Remapping memory failed, error: %d\n", ret); |
| 207 | return ret; |
| 208 | } |
| 209 | |
| 210 | vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; |
| 211 | vma->vm_private_data = &buf->handler; |
| 212 | vma->vm_ops = &vb2_common_vm_ops; |
| 213 | |
| 214 | vma->vm_ops->open(vma); |
| 215 | |
| 216 | pr_debug("%s: mapped dma addr 0x%08lx at 0x%08lx, size %ld\n", |
| 217 | __func__, (unsigned long)buf->dma_addr, vma->vm_start, |
| 218 | buf->size); |
| 219 | |
| 220 | return 0; |
Pawel Osciak | 1a758d4 | 2010-10-11 10:59:36 -0300 | [diff] [blame] | 221 | } |
| 222 | |
Laurent Pinchart | 40d8b76 | 2012-06-14 10:37:41 -0300 | [diff] [blame] | 223 | /*********************************************/ |
Tomasz Stanislawski | 9ef2cbe | 2012-06-14 11:32:25 -0300 | [diff] [blame] | 224 | /* DMABUF ops for exporters */ |
| 225 | /*********************************************/ |
| 226 | |
| 227 | struct vb2_dc_attachment { |
| 228 | struct sg_table sgt; |
| 229 | enum dma_data_direction dir; |
| 230 | }; |
| 231 | |
| 232 | static int vb2_dc_dmabuf_ops_attach(struct dma_buf *dbuf, struct device *dev, |
| 233 | struct dma_buf_attachment *dbuf_attach) |
| 234 | { |
| 235 | struct vb2_dc_attachment *attach; |
| 236 | unsigned int i; |
| 237 | struct scatterlist *rd, *wr; |
| 238 | struct sg_table *sgt; |
| 239 | struct vb2_dc_buf *buf = dbuf->priv; |
| 240 | int ret; |
| 241 | |
| 242 | attach = kzalloc(sizeof(*attach), GFP_KERNEL); |
| 243 | if (!attach) |
| 244 | return -ENOMEM; |
| 245 | |
| 246 | sgt = &attach->sgt; |
| 247 | /* Copy the buf->base_sgt scatter list to the attachment, as we can't |
| 248 | * map the same scatter list to multiple attachments at the same time. |
| 249 | */ |
| 250 | ret = sg_alloc_table(sgt, buf->sgt_base->orig_nents, GFP_KERNEL); |
| 251 | if (ret) { |
| 252 | kfree(attach); |
| 253 | return -ENOMEM; |
| 254 | } |
| 255 | |
| 256 | rd = buf->sgt_base->sgl; |
| 257 | wr = sgt->sgl; |
| 258 | for (i = 0; i < sgt->orig_nents; ++i) { |
| 259 | sg_set_page(wr, sg_page(rd), rd->length, rd->offset); |
| 260 | rd = sg_next(rd); |
| 261 | wr = sg_next(wr); |
| 262 | } |
| 263 | |
| 264 | attach->dir = DMA_NONE; |
| 265 | dbuf_attach->priv = attach; |
| 266 | |
| 267 | return 0; |
| 268 | } |
| 269 | |
| 270 | static void vb2_dc_dmabuf_ops_detach(struct dma_buf *dbuf, |
| 271 | struct dma_buf_attachment *db_attach) |
| 272 | { |
| 273 | struct vb2_dc_attachment *attach = db_attach->priv; |
| 274 | struct sg_table *sgt; |
| 275 | |
| 276 | if (!attach) |
| 277 | return; |
| 278 | |
| 279 | sgt = &attach->sgt; |
| 280 | |
| 281 | /* release the scatterlist cache */ |
| 282 | if (attach->dir != DMA_NONE) |
| 283 | dma_unmap_sg(db_attach->dev, sgt->sgl, sgt->orig_nents, |
| 284 | attach->dir); |
| 285 | sg_free_table(sgt); |
| 286 | kfree(attach); |
| 287 | db_attach->priv = NULL; |
| 288 | } |
| 289 | |
| 290 | static struct sg_table *vb2_dc_dmabuf_ops_map( |
| 291 | struct dma_buf_attachment *db_attach, enum dma_data_direction dir) |
| 292 | { |
| 293 | struct vb2_dc_attachment *attach = db_attach->priv; |
| 294 | /* stealing dmabuf mutex to serialize map/unmap operations */ |
| 295 | struct mutex *lock = &db_attach->dmabuf->lock; |
| 296 | struct sg_table *sgt; |
| 297 | int ret; |
| 298 | |
| 299 | mutex_lock(lock); |
| 300 | |
| 301 | sgt = &attach->sgt; |
| 302 | /* return previously mapped sg table */ |
| 303 | if (attach->dir == dir) { |
| 304 | mutex_unlock(lock); |
| 305 | return sgt; |
| 306 | } |
| 307 | |
| 308 | /* release any previous cache */ |
| 309 | if (attach->dir != DMA_NONE) { |
| 310 | dma_unmap_sg(db_attach->dev, sgt->sgl, sgt->orig_nents, |
| 311 | attach->dir); |
| 312 | attach->dir = DMA_NONE; |
| 313 | } |
| 314 | |
| 315 | /* mapping to the client with new direction */ |
| 316 | ret = dma_map_sg(db_attach->dev, sgt->sgl, sgt->orig_nents, dir); |
| 317 | if (ret <= 0) { |
| 318 | pr_err("failed to map scatterlist\n"); |
| 319 | mutex_unlock(lock); |
| 320 | return ERR_PTR(-EIO); |
| 321 | } |
| 322 | |
| 323 | attach->dir = dir; |
| 324 | |
| 325 | mutex_unlock(lock); |
| 326 | |
| 327 | return sgt; |
| 328 | } |
| 329 | |
| 330 | static void vb2_dc_dmabuf_ops_unmap(struct dma_buf_attachment *db_attach, |
| 331 | struct sg_table *sgt, enum dma_data_direction dir) |
| 332 | { |
| 333 | /* nothing to be done here */ |
| 334 | } |
| 335 | |
| 336 | static void vb2_dc_dmabuf_ops_release(struct dma_buf *dbuf) |
| 337 | { |
| 338 | /* drop reference obtained in vb2_dc_get_dmabuf */ |
| 339 | vb2_dc_put(dbuf->priv); |
| 340 | } |
| 341 | |
| 342 | static void *vb2_dc_dmabuf_ops_kmap(struct dma_buf *dbuf, unsigned long pgnum) |
| 343 | { |
| 344 | struct vb2_dc_buf *buf = dbuf->priv; |
| 345 | |
| 346 | return buf->vaddr + pgnum * PAGE_SIZE; |
| 347 | } |
| 348 | |
| 349 | static void *vb2_dc_dmabuf_ops_vmap(struct dma_buf *dbuf) |
| 350 | { |
| 351 | struct vb2_dc_buf *buf = dbuf->priv; |
| 352 | |
| 353 | return buf->vaddr; |
| 354 | } |
| 355 | |
| 356 | static int vb2_dc_dmabuf_ops_mmap(struct dma_buf *dbuf, |
| 357 | struct vm_area_struct *vma) |
| 358 | { |
| 359 | return vb2_dc_mmap(dbuf->priv, vma); |
| 360 | } |
| 361 | |
| 362 | static struct dma_buf_ops vb2_dc_dmabuf_ops = { |
| 363 | .attach = vb2_dc_dmabuf_ops_attach, |
| 364 | .detach = vb2_dc_dmabuf_ops_detach, |
| 365 | .map_dma_buf = vb2_dc_dmabuf_ops_map, |
| 366 | .unmap_dma_buf = vb2_dc_dmabuf_ops_unmap, |
| 367 | .kmap = vb2_dc_dmabuf_ops_kmap, |
| 368 | .kmap_atomic = vb2_dc_dmabuf_ops_kmap, |
| 369 | .vmap = vb2_dc_dmabuf_ops_vmap, |
| 370 | .mmap = vb2_dc_dmabuf_ops_mmap, |
| 371 | .release = vb2_dc_dmabuf_ops_release, |
| 372 | }; |
| 373 | |
| 374 | static struct sg_table *vb2_dc_get_base_sgt(struct vb2_dc_buf *buf) |
| 375 | { |
| 376 | int ret; |
| 377 | struct sg_table *sgt; |
| 378 | |
| 379 | sgt = kmalloc(sizeof(*sgt), GFP_KERNEL); |
| 380 | if (!sgt) { |
| 381 | dev_err(buf->dev, "failed to alloc sg table\n"); |
| 382 | return NULL; |
| 383 | } |
| 384 | |
| 385 | ret = dma_get_sgtable(buf->dev, sgt, buf->vaddr, buf->dma_addr, |
| 386 | buf->size); |
| 387 | if (ret < 0) { |
| 388 | dev_err(buf->dev, "failed to get scatterlist from DMA API\n"); |
| 389 | kfree(sgt); |
| 390 | return NULL; |
| 391 | } |
| 392 | |
| 393 | return sgt; |
| 394 | } |
| 395 | |
Philipp Zabel | ea3aba8 | 2013-05-21 05:11:35 -0300 | [diff] [blame^] | 396 | static struct dma_buf *vb2_dc_get_dmabuf(void *buf_priv, unsigned long flags) |
Tomasz Stanislawski | 9ef2cbe | 2012-06-14 11:32:25 -0300 | [diff] [blame] | 397 | { |
| 398 | struct vb2_dc_buf *buf = buf_priv; |
| 399 | struct dma_buf *dbuf; |
| 400 | |
| 401 | if (!buf->sgt_base) |
| 402 | buf->sgt_base = vb2_dc_get_base_sgt(buf); |
| 403 | |
| 404 | if (WARN_ON(!buf->sgt_base)) |
| 405 | return NULL; |
| 406 | |
Philipp Zabel | ea3aba8 | 2013-05-21 05:11:35 -0300 | [diff] [blame^] | 407 | dbuf = dma_buf_export(buf, &vb2_dc_dmabuf_ops, buf->size, flags); |
Tomasz Stanislawski | 9ef2cbe | 2012-06-14 11:32:25 -0300 | [diff] [blame] | 408 | if (IS_ERR(dbuf)) |
| 409 | return NULL; |
| 410 | |
| 411 | /* dmabuf keeps reference to vb2 buffer */ |
| 412 | atomic_inc(&buf->refcount); |
| 413 | |
| 414 | return dbuf; |
| 415 | } |
| 416 | |
| 417 | /*********************************************/ |
Laurent Pinchart | 40d8b76 | 2012-06-14 10:37:41 -0300 | [diff] [blame] | 418 | /* callbacks for USERPTR buffers */ |
| 419 | /*********************************************/ |
| 420 | |
Tomasz Stanislawski | e15dab7 | 2012-06-14 10:37:42 -0300 | [diff] [blame] | 421 | static inline int vma_is_io(struct vm_area_struct *vma) |
Pawel Osciak | 1a758d4 | 2010-10-11 10:59:36 -0300 | [diff] [blame] | 422 | { |
Tomasz Stanislawski | e15dab7 | 2012-06-14 10:37:42 -0300 | [diff] [blame] | 423 | return !!(vma->vm_flags & (VM_IO | VM_PFNMAP)); |
| 424 | } |
| 425 | |
Marek Szyprowski | 774d230 | 2013-06-19 08:56:46 -0300 | [diff] [blame] | 426 | static int vb2_dc_get_user_pfn(unsigned long start, int n_pages, |
| 427 | struct vm_area_struct *vma, unsigned long *res) |
| 428 | { |
| 429 | unsigned long pfn, start_pfn, prev_pfn; |
| 430 | unsigned int i; |
| 431 | int ret; |
| 432 | |
| 433 | if (!vma_is_io(vma)) |
| 434 | return -EFAULT; |
| 435 | |
| 436 | ret = follow_pfn(vma, start, &pfn); |
| 437 | if (ret) |
| 438 | return ret; |
| 439 | |
| 440 | start_pfn = pfn; |
| 441 | start += PAGE_SIZE; |
| 442 | |
| 443 | for (i = 1; i < n_pages; ++i, start += PAGE_SIZE) { |
| 444 | prev_pfn = pfn; |
| 445 | ret = follow_pfn(vma, start, &pfn); |
| 446 | |
| 447 | if (ret) { |
| 448 | pr_err("no page for address %lu\n", start); |
| 449 | return ret; |
| 450 | } |
| 451 | if (pfn != prev_pfn + 1) |
| 452 | return -EINVAL; |
| 453 | } |
| 454 | |
| 455 | *res = start_pfn; |
| 456 | return 0; |
| 457 | } |
| 458 | |
Tomasz Stanislawski | e15dab7 | 2012-06-14 10:37:42 -0300 | [diff] [blame] | 459 | static int vb2_dc_get_user_pages(unsigned long start, struct page **pages, |
| 460 | int n_pages, struct vm_area_struct *vma, int write) |
| 461 | { |
| 462 | if (vma_is_io(vma)) { |
| 463 | unsigned int i; |
| 464 | |
| 465 | for (i = 0; i < n_pages; ++i, start += PAGE_SIZE) { |
| 466 | unsigned long pfn; |
| 467 | int ret = follow_pfn(vma, start, &pfn); |
| 468 | |
Marek Szyprowski | 774d230 | 2013-06-19 08:56:46 -0300 | [diff] [blame] | 469 | if (!pfn_valid(pfn)) |
| 470 | return -EINVAL; |
| 471 | |
Tomasz Stanislawski | e15dab7 | 2012-06-14 10:37:42 -0300 | [diff] [blame] | 472 | if (ret) { |
| 473 | pr_err("no page for address %lu\n", start); |
| 474 | return ret; |
| 475 | } |
| 476 | pages[i] = pfn_to_page(pfn); |
| 477 | } |
| 478 | } else { |
| 479 | int n; |
| 480 | |
| 481 | n = get_user_pages(current, current->mm, start & PAGE_MASK, |
| 482 | n_pages, write, 1, pages, NULL); |
| 483 | /* negative error means that no page was pinned */ |
| 484 | n = max(n, 0); |
| 485 | if (n != n_pages) { |
| 486 | pr_err("got only %d of %d user pages\n", n, n_pages); |
| 487 | while (n) |
| 488 | put_page(pages[--n]); |
| 489 | return -EFAULT; |
| 490 | } |
| 491 | } |
| 492 | |
| 493 | return 0; |
| 494 | } |
| 495 | |
| 496 | static void vb2_dc_put_dirty_page(struct page *page) |
| 497 | { |
| 498 | set_page_dirty_lock(page); |
| 499 | put_page(page); |
| 500 | } |
| 501 | |
| 502 | static void vb2_dc_put_userptr(void *buf_priv) |
| 503 | { |
| 504 | struct vb2_dc_buf *buf = buf_priv; |
| 505 | struct sg_table *sgt = buf->dma_sgt; |
| 506 | |
Marek Szyprowski | 774d230 | 2013-06-19 08:56:46 -0300 | [diff] [blame] | 507 | if (sgt) { |
| 508 | dma_unmap_sg(buf->dev, sgt->sgl, sgt->orig_nents, buf->dma_dir); |
| 509 | if (!vma_is_io(buf->vma)) |
| 510 | vb2_dc_sgt_foreach_page(sgt, vb2_dc_put_dirty_page); |
Tomasz Stanislawski | e15dab7 | 2012-06-14 10:37:42 -0300 | [diff] [blame] | 511 | |
Marek Szyprowski | 774d230 | 2013-06-19 08:56:46 -0300 | [diff] [blame] | 512 | sg_free_table(sgt); |
| 513 | kfree(sgt); |
| 514 | } |
Tomasz Stanislawski | e15dab7 | 2012-06-14 10:37:42 -0300 | [diff] [blame] | 515 | vb2_put_vma(buf->vma); |
| 516 | kfree(buf); |
| 517 | } |
| 518 | |
Marek Szyprowski | 774d230 | 2013-06-19 08:56:46 -0300 | [diff] [blame] | 519 | /* |
| 520 | * For some kind of reserved memory there might be no struct page available, |
| 521 | * so all that can be done to support such 'pages' is to try to convert |
| 522 | * pfn to dma address or at the last resort just assume that |
| 523 | * dma address == physical address (like it has been assumed in earlier version |
| 524 | * of videobuf2-dma-contig |
| 525 | */ |
| 526 | |
| 527 | #ifdef __arch_pfn_to_dma |
| 528 | static inline dma_addr_t vb2_dc_pfn_to_dma(struct device *dev, unsigned long pfn) |
| 529 | { |
| 530 | return (dma_addr_t)__arch_pfn_to_dma(dev, pfn); |
| 531 | } |
| 532 | #elif defined(__pfn_to_bus) |
| 533 | static inline dma_addr_t vb2_dc_pfn_to_dma(struct device *dev, unsigned long pfn) |
| 534 | { |
| 535 | return (dma_addr_t)__pfn_to_bus(pfn); |
| 536 | } |
| 537 | #elif defined(__pfn_to_phys) |
| 538 | static inline dma_addr_t vb2_dc_pfn_to_dma(struct device *dev, unsigned long pfn) |
| 539 | { |
| 540 | return (dma_addr_t)__pfn_to_phys(pfn); |
| 541 | } |
| 542 | #else |
| 543 | static inline dma_addr_t vb2_dc_pfn_to_dma(struct device *dev, unsigned long pfn) |
| 544 | { |
| 545 | /* really, we cannot do anything better at this point */ |
| 546 | return (dma_addr_t)(pfn) << PAGE_SHIFT; |
| 547 | } |
| 548 | #endif |
| 549 | |
Tomasz Stanislawski | e15dab7 | 2012-06-14 10:37:42 -0300 | [diff] [blame] | 550 | static void *vb2_dc_get_userptr(void *alloc_ctx, unsigned long vaddr, |
| 551 | unsigned long size, int write) |
| 552 | { |
| 553 | struct vb2_dc_conf *conf = alloc_ctx; |
Pawel Osciak | 1a758d4 | 2010-10-11 10:59:36 -0300 | [diff] [blame] | 554 | struct vb2_dc_buf *buf; |
Tomasz Stanislawski | e15dab7 | 2012-06-14 10:37:42 -0300 | [diff] [blame] | 555 | unsigned long start; |
| 556 | unsigned long end; |
| 557 | unsigned long offset; |
| 558 | struct page **pages; |
| 559 | int n_pages; |
| 560 | int ret = 0; |
Pawel Osciak | 1a758d4 | 2010-10-11 10:59:36 -0300 | [diff] [blame] | 561 | struct vm_area_struct *vma; |
Tomasz Stanislawski | e15dab7 | 2012-06-14 10:37:42 -0300 | [diff] [blame] | 562 | struct sg_table *sgt; |
| 563 | unsigned long contig_size; |
Marek Szyprowski | d81e870 | 2012-06-12 10:18:16 -0300 | [diff] [blame] | 564 | unsigned long dma_align = dma_get_cache_alignment(); |
| 565 | |
| 566 | /* Only cache aligned DMA transfers are reliable */ |
| 567 | if (!IS_ALIGNED(vaddr | size, dma_align)) { |
| 568 | pr_debug("user data must be aligned to %lu bytes\n", dma_align); |
| 569 | return ERR_PTR(-EINVAL); |
| 570 | } |
| 571 | |
| 572 | if (!size) { |
| 573 | pr_debug("size is zero\n"); |
| 574 | return ERR_PTR(-EINVAL); |
| 575 | } |
Pawel Osciak | 1a758d4 | 2010-10-11 10:59:36 -0300 | [diff] [blame] | 576 | |
| 577 | buf = kzalloc(sizeof *buf, GFP_KERNEL); |
| 578 | if (!buf) |
| 579 | return ERR_PTR(-ENOMEM); |
| 580 | |
Tomasz Stanislawski | e15dab7 | 2012-06-14 10:37:42 -0300 | [diff] [blame] | 581 | buf->dev = conf->dev; |
| 582 | buf->dma_dir = write ? DMA_FROM_DEVICE : DMA_TO_DEVICE; |
| 583 | |
| 584 | start = vaddr & PAGE_MASK; |
| 585 | offset = vaddr & ~PAGE_MASK; |
| 586 | end = PAGE_ALIGN(vaddr + size); |
| 587 | n_pages = (end - start) >> PAGE_SHIFT; |
| 588 | |
| 589 | pages = kmalloc(n_pages * sizeof(pages[0]), GFP_KERNEL); |
| 590 | if (!pages) { |
| 591 | ret = -ENOMEM; |
| 592 | pr_err("failed to allocate pages table\n"); |
| 593 | goto fail_buf; |
Pawel Osciak | 1a758d4 | 2010-10-11 10:59:36 -0300 | [diff] [blame] | 594 | } |
| 595 | |
Tomasz Stanislawski | e15dab7 | 2012-06-14 10:37:42 -0300 | [diff] [blame] | 596 | /* current->mm->mmap_sem is taken by videobuf2 core */ |
| 597 | vma = find_vma(current->mm, vaddr); |
| 598 | if (!vma) { |
| 599 | pr_err("no vma for address %lu\n", vaddr); |
| 600 | ret = -EFAULT; |
| 601 | goto fail_pages; |
| 602 | } |
| 603 | |
| 604 | if (vma->vm_end < vaddr + size) { |
| 605 | pr_err("vma at %lu is too small for %lu bytes\n", vaddr, size); |
| 606 | ret = -EFAULT; |
| 607 | goto fail_pages; |
| 608 | } |
| 609 | |
| 610 | buf->vma = vb2_get_vma(vma); |
| 611 | if (!buf->vma) { |
| 612 | pr_err("failed to copy vma\n"); |
| 613 | ret = -ENOMEM; |
| 614 | goto fail_pages; |
| 615 | } |
| 616 | |
| 617 | /* extract page list from userspace mapping */ |
| 618 | ret = vb2_dc_get_user_pages(start, pages, n_pages, vma, write); |
| 619 | if (ret) { |
Marek Szyprowski | 774d230 | 2013-06-19 08:56:46 -0300 | [diff] [blame] | 620 | unsigned long pfn; |
| 621 | if (vb2_dc_get_user_pfn(start, n_pages, vma, &pfn) == 0) { |
| 622 | buf->dma_addr = vb2_dc_pfn_to_dma(buf->dev, pfn); |
| 623 | buf->size = size; |
| 624 | kfree(pages); |
| 625 | return buf; |
| 626 | } |
| 627 | |
Tomasz Stanislawski | e15dab7 | 2012-06-14 10:37:42 -0300 | [diff] [blame] | 628 | pr_err("failed to get user pages\n"); |
| 629 | goto fail_vma; |
| 630 | } |
| 631 | |
| 632 | sgt = kzalloc(sizeof(*sgt), GFP_KERNEL); |
| 633 | if (!sgt) { |
| 634 | pr_err("failed to allocate sg table\n"); |
| 635 | ret = -ENOMEM; |
| 636 | goto fail_get_user_pages; |
| 637 | } |
| 638 | |
| 639 | ret = sg_alloc_table_from_pages(sgt, pages, n_pages, |
| 640 | offset, size, GFP_KERNEL); |
| 641 | if (ret) { |
| 642 | pr_err("failed to initialize sg table\n"); |
| 643 | goto fail_sgt; |
| 644 | } |
| 645 | |
| 646 | /* pages are no longer needed */ |
| 647 | kfree(pages); |
| 648 | pages = NULL; |
| 649 | |
| 650 | sgt->nents = dma_map_sg(buf->dev, sgt->sgl, sgt->orig_nents, |
| 651 | buf->dma_dir); |
| 652 | if (sgt->nents <= 0) { |
| 653 | pr_err("failed to map scatterlist\n"); |
| 654 | ret = -EIO; |
| 655 | goto fail_sgt_init; |
| 656 | } |
| 657 | |
| 658 | contig_size = vb2_dc_get_contiguous_size(sgt); |
| 659 | if (contig_size < size) { |
| 660 | pr_err("contiguous mapping is too small %lu/%lu\n", |
| 661 | contig_size, size); |
| 662 | ret = -EFAULT; |
| 663 | goto fail_map_sg; |
| 664 | } |
| 665 | |
| 666 | buf->dma_addr = sg_dma_address(sgt->sgl); |
Pawel Osciak | 1a758d4 | 2010-10-11 10:59:36 -0300 | [diff] [blame] | 667 | buf->size = size; |
Tomasz Stanislawski | e15dab7 | 2012-06-14 10:37:42 -0300 | [diff] [blame] | 668 | buf->dma_sgt = sgt; |
Pawel Osciak | 1a758d4 | 2010-10-11 10:59:36 -0300 | [diff] [blame] | 669 | |
| 670 | return buf; |
Pawel Osciak | 1a758d4 | 2010-10-11 10:59:36 -0300 | [diff] [blame] | 671 | |
Tomasz Stanislawski | e15dab7 | 2012-06-14 10:37:42 -0300 | [diff] [blame] | 672 | fail_map_sg: |
| 673 | dma_unmap_sg(buf->dev, sgt->sgl, sgt->orig_nents, buf->dma_dir); |
Pawel Osciak | 1a758d4 | 2010-10-11 10:59:36 -0300 | [diff] [blame] | 674 | |
Tomasz Stanislawski | e15dab7 | 2012-06-14 10:37:42 -0300 | [diff] [blame] | 675 | fail_sgt_init: |
| 676 | if (!vma_is_io(buf->vma)) |
| 677 | vb2_dc_sgt_foreach_page(sgt, put_page); |
| 678 | sg_free_table(sgt); |
Pawel Osciak | 1a758d4 | 2010-10-11 10:59:36 -0300 | [diff] [blame] | 679 | |
Tomasz Stanislawski | e15dab7 | 2012-06-14 10:37:42 -0300 | [diff] [blame] | 680 | fail_sgt: |
| 681 | kfree(sgt); |
| 682 | |
| 683 | fail_get_user_pages: |
| 684 | if (pages && !vma_is_io(buf->vma)) |
| 685 | while (n_pages) |
| 686 | put_page(pages[--n_pages]); |
| 687 | |
| 688 | fail_vma: |
Pawel Osciak | 1a758d4 | 2010-10-11 10:59:36 -0300 | [diff] [blame] | 689 | vb2_put_vma(buf->vma); |
Tomasz Stanislawski | e15dab7 | 2012-06-14 10:37:42 -0300 | [diff] [blame] | 690 | |
| 691 | fail_pages: |
| 692 | kfree(pages); /* kfree is NULL-proof */ |
| 693 | |
| 694 | fail_buf: |
Pawel Osciak | 1a758d4 | 2010-10-11 10:59:36 -0300 | [diff] [blame] | 695 | kfree(buf); |
Tomasz Stanislawski | e15dab7 | 2012-06-14 10:37:42 -0300 | [diff] [blame] | 696 | |
| 697 | return ERR_PTR(ret); |
Pawel Osciak | 1a758d4 | 2010-10-11 10:59:36 -0300 | [diff] [blame] | 698 | } |
| 699 | |
Laurent Pinchart | 40d8b76 | 2012-06-14 10:37:41 -0300 | [diff] [blame] | 700 | /*********************************************/ |
Sumit Semwal | 8c417d0 | 2012-06-14 10:37:45 -0300 | [diff] [blame] | 701 | /* callbacks for DMABUF buffers */ |
| 702 | /*********************************************/ |
| 703 | |
| 704 | static int vb2_dc_map_dmabuf(void *mem_priv) |
| 705 | { |
| 706 | struct vb2_dc_buf *buf = mem_priv; |
| 707 | struct sg_table *sgt; |
| 708 | unsigned long contig_size; |
| 709 | |
| 710 | if (WARN_ON(!buf->db_attach)) { |
| 711 | pr_err("trying to pin a non attached buffer\n"); |
| 712 | return -EINVAL; |
| 713 | } |
| 714 | |
| 715 | if (WARN_ON(buf->dma_sgt)) { |
| 716 | pr_err("dmabuf buffer is already pinned\n"); |
| 717 | return 0; |
| 718 | } |
| 719 | |
| 720 | /* get the associated scatterlist for this buffer */ |
| 721 | sgt = dma_buf_map_attachment(buf->db_attach, buf->dma_dir); |
| 722 | if (IS_ERR_OR_NULL(sgt)) { |
| 723 | pr_err("Error getting dmabuf scatterlist\n"); |
| 724 | return -EINVAL; |
| 725 | } |
| 726 | |
| 727 | /* checking if dmabuf is big enough to store contiguous chunk */ |
| 728 | contig_size = vb2_dc_get_contiguous_size(sgt); |
| 729 | if (contig_size < buf->size) { |
| 730 | pr_err("contiguous chunk is too small %lu/%lu b\n", |
| 731 | contig_size, buf->size); |
| 732 | dma_buf_unmap_attachment(buf->db_attach, sgt, buf->dma_dir); |
| 733 | return -EFAULT; |
| 734 | } |
| 735 | |
| 736 | buf->dma_addr = sg_dma_address(sgt->sgl); |
| 737 | buf->dma_sgt = sgt; |
| 738 | |
| 739 | return 0; |
| 740 | } |
| 741 | |
| 742 | static void vb2_dc_unmap_dmabuf(void *mem_priv) |
| 743 | { |
| 744 | struct vb2_dc_buf *buf = mem_priv; |
| 745 | struct sg_table *sgt = buf->dma_sgt; |
| 746 | |
| 747 | if (WARN_ON(!buf->db_attach)) { |
| 748 | pr_err("trying to unpin a not attached buffer\n"); |
| 749 | return; |
| 750 | } |
| 751 | |
| 752 | if (WARN_ON(!sgt)) { |
| 753 | pr_err("dmabuf buffer is already unpinned\n"); |
| 754 | return; |
| 755 | } |
| 756 | |
| 757 | dma_buf_unmap_attachment(buf->db_attach, sgt, buf->dma_dir); |
| 758 | |
| 759 | buf->dma_addr = 0; |
| 760 | buf->dma_sgt = NULL; |
| 761 | } |
| 762 | |
| 763 | static void vb2_dc_detach_dmabuf(void *mem_priv) |
| 764 | { |
| 765 | struct vb2_dc_buf *buf = mem_priv; |
| 766 | |
| 767 | /* if vb2 works correctly you should never detach mapped buffer */ |
| 768 | if (WARN_ON(buf->dma_addr)) |
| 769 | vb2_dc_unmap_dmabuf(buf); |
| 770 | |
| 771 | /* detach this attachment */ |
| 772 | dma_buf_detach(buf->db_attach->dmabuf, buf->db_attach); |
| 773 | kfree(buf); |
| 774 | } |
| 775 | |
| 776 | static void *vb2_dc_attach_dmabuf(void *alloc_ctx, struct dma_buf *dbuf, |
| 777 | unsigned long size, int write) |
| 778 | { |
| 779 | struct vb2_dc_conf *conf = alloc_ctx; |
| 780 | struct vb2_dc_buf *buf; |
| 781 | struct dma_buf_attachment *dba; |
| 782 | |
| 783 | if (dbuf->size < size) |
| 784 | return ERR_PTR(-EFAULT); |
| 785 | |
| 786 | buf = kzalloc(sizeof(*buf), GFP_KERNEL); |
| 787 | if (!buf) |
| 788 | return ERR_PTR(-ENOMEM); |
| 789 | |
| 790 | buf->dev = conf->dev; |
| 791 | /* create attachment for the dmabuf with the user device */ |
| 792 | dba = dma_buf_attach(dbuf, buf->dev); |
| 793 | if (IS_ERR(dba)) { |
| 794 | pr_err("failed to attach dmabuf\n"); |
| 795 | kfree(buf); |
| 796 | return dba; |
| 797 | } |
| 798 | |
| 799 | buf->dma_dir = write ? DMA_FROM_DEVICE : DMA_TO_DEVICE; |
| 800 | buf->size = size; |
| 801 | buf->db_attach = dba; |
| 802 | |
| 803 | return buf; |
| 804 | } |
| 805 | |
| 806 | /*********************************************/ |
Laurent Pinchart | 40d8b76 | 2012-06-14 10:37:41 -0300 | [diff] [blame] | 807 | /* DMA CONTIG exported functions */ |
| 808 | /*********************************************/ |
| 809 | |
Pawel Osciak | 1a758d4 | 2010-10-11 10:59:36 -0300 | [diff] [blame] | 810 | const struct vb2_mem_ops vb2_dma_contig_memops = { |
Laurent Pinchart | f7f129c | 2012-06-14 10:37:39 -0300 | [diff] [blame] | 811 | .alloc = vb2_dc_alloc, |
| 812 | .put = vb2_dc_put, |
Tomasz Stanislawski | 9ef2cbe | 2012-06-14 11:32:25 -0300 | [diff] [blame] | 813 | .get_dmabuf = vb2_dc_get_dmabuf, |
Laurent Pinchart | f7f129c | 2012-06-14 10:37:39 -0300 | [diff] [blame] | 814 | .cookie = vb2_dc_cookie, |
| 815 | .vaddr = vb2_dc_vaddr, |
| 816 | .mmap = vb2_dc_mmap, |
| 817 | .get_userptr = vb2_dc_get_userptr, |
| 818 | .put_userptr = vb2_dc_put_userptr, |
Marek Szyprowski | 199d101 | 2012-06-14 10:37:44 -0300 | [diff] [blame] | 819 | .prepare = vb2_dc_prepare, |
| 820 | .finish = vb2_dc_finish, |
Sumit Semwal | 8c417d0 | 2012-06-14 10:37:45 -0300 | [diff] [blame] | 821 | .map_dmabuf = vb2_dc_map_dmabuf, |
| 822 | .unmap_dmabuf = vb2_dc_unmap_dmabuf, |
| 823 | .attach_dmabuf = vb2_dc_attach_dmabuf, |
| 824 | .detach_dmabuf = vb2_dc_detach_dmabuf, |
Laurent Pinchart | f7f129c | 2012-06-14 10:37:39 -0300 | [diff] [blame] | 825 | .num_users = vb2_dc_num_users, |
Pawel Osciak | 1a758d4 | 2010-10-11 10:59:36 -0300 | [diff] [blame] | 826 | }; |
| 827 | EXPORT_SYMBOL_GPL(vb2_dma_contig_memops); |
| 828 | |
| 829 | void *vb2_dma_contig_init_ctx(struct device *dev) |
| 830 | { |
| 831 | struct vb2_dc_conf *conf; |
| 832 | |
| 833 | conf = kzalloc(sizeof *conf, GFP_KERNEL); |
| 834 | if (!conf) |
| 835 | return ERR_PTR(-ENOMEM); |
| 836 | |
| 837 | conf->dev = dev; |
| 838 | |
| 839 | return conf; |
| 840 | } |
| 841 | EXPORT_SYMBOL_GPL(vb2_dma_contig_init_ctx); |
| 842 | |
| 843 | void vb2_dma_contig_cleanup_ctx(void *alloc_ctx) |
| 844 | { |
| 845 | kfree(alloc_ctx); |
| 846 | } |
| 847 | EXPORT_SYMBOL_GPL(vb2_dma_contig_cleanup_ctx); |
| 848 | |
| 849 | MODULE_DESCRIPTION("DMA-contig memory handling routines for videobuf2"); |
Pawel Osciak | 9507208 | 2011-03-13 15:23:32 -0300 | [diff] [blame] | 850 | MODULE_AUTHOR("Pawel Osciak <pawel@osciak.com>"); |
Pawel Osciak | 1a758d4 | 2010-10-11 10:59:36 -0300 | [diff] [blame] | 851 | MODULE_LICENSE("GPL"); |