- 追加された行はこの色です。
- 削除された行はこの色です。
*参照元 [#vfb51f8f]
#backlinks
*説明 [#m4629387]
-パス: [[linux-4.4.1/drivers/media/v4l2-core/videobuf2-dma-contig.c]]
-FIXME: これは何?
--説明
**引数 [#x55a4f58]
-void *alloc_ctx
--
-unsigned long size
--
-enum dma_data_direction dma_dir
--
--[[linux-4.4.1/dma_data_direction]]
-gfp_t gfp_flags
--
--[[linux-4.4.1/gfp_t]]
**返り値 [#g674173c]
-void *
--
**参考 [#l46cf1f2]
*実装 [#y927cc46]
static void *vb2_dc_alloc(void *alloc_ctx, unsigned long size,
enum dma_data_direction dma_dir, gfp_t gfp_flags)
{
struct vb2_dc_conf *conf = alloc_ctx;
struct device *dev = conf->dev;
struct vb2_dc_buf *buf;
-
--[[linux-4.4.1/vb2_dc_conf]]
--[[linux-4.4.1/device]]
--[[linux-4.4.1/vb2_dc_conf]]
--[[linux-4.4.1/vb2_dc_buf]]
buf = kzalloc(sizeof *buf, GFP_KERNEL);
if (!buf)
return ERR_PTR(-ENOMEM);
-
--[[linux-4.4.1/kzalloc()]]
--[[linux-4.4.1/ERR_PTR()]]
buf->vaddr = dma_alloc_coherent(dev, size, &buf->dma_addr,
GFP_KERNEL | gfp_flags);
if (!buf->vaddr) {
dev_err(dev, "dma_alloc_coherent of size %ld failed\n", size);
kfree(buf);
return ERR_PTR(-ENOMEM);
}
-
--[[linux-4.4.1/dma_alloc_coherent()]]
--[[linux-4.4.1/dev_err()]]
/* Prevent the device from being released while the buffer is used */
buf->dev = get_device(dev);
buf->size = size;
buf->dma_dir = dma_dir;
buf->handler.refcount = &buf->refcount;
buf->handler.put = vb2_dc_put;
buf->handler.arg = buf;
-
--[[linux-4.4.1/get_device()]]
--[[linux-4.4.1/vb2_dc_put()]]
atomic_inc(&buf->refcount);
-
--[[linux-4.4.1/atomic_inc()]]
return buf;
}
*コメント [#o7d910ff]