Hello
Marek Szyprowski Wrote:
> Sent: Monday, December 06, 2010 7:53 PM
> To: [email protected]
> Cc: [email protected]; [email protected]; [email protected];
> [email protected]
> Subject: [PATCH 8/8] v4l: videobuf2: add CMA allocator
<snip>
> +struct vb2_cma_buf {
> + struct vb2_cma_conf *conf;
> + dma_addr_t paddr;
> + unsigned long size;
> + struct vm_area_struct *vma;
> + atomic_t refcount;
> + struct vb2_vmarea_handler handler;
> +};
> +
> +static void vb2_cma_put(void *buf_priv);
> +
> +static void *vb2_cma_alloc(void *alloc_ctx, unsigned long size)
> +{
> + struct vb2_cma_conf *conf = alloc_ctx;
I wonder that
how to acquire vb2_cma_cont value without container_of() or explicit type
conversion?
Does not conversion from alloc_ctx type to vb2_cma_conf type when caller is
called.
> + struct vb2_cma_buf *buf;
> +
> + buf = kzalloc(sizeof *buf, GFP_KERNEL);
> + if (!buf)
> + return ERR_PTR(-ENOMEM);
> +
> + buf->paddr = cma_alloc(conf->dev, conf->type, size, conf-
> >alignment);
> + if (IS_ERR((void *)buf->paddr)) {
> + printk(KERN_ERR "cma_alloc of size %ld failed\n", size);
> + kfree(buf);
> + return ERR_PTR(-ENOMEM);
> + }
> +
> + buf->conf = conf;
> + buf->size = size;
> +
> + buf->handler.refcount = &buf->refcount;
> + buf->handler.put = vb2_cma_put;
> + buf->handler.arg = buf;
> +
> + atomic_inc(&buf->refcount);
> +
> + return buf;
> +}
> +
<snip>
> +struct vb2_alloc_ctx *vb2_cma_init(struct device *dev, const char *type,
> + unsigned long alignment);
> +void vb2_cma_cleanup(struct vb2_alloc_ctx *alloc_ctx);
> +
> +struct vb2_alloc_ctx **vb2_cma_init_multi(struct device *dev,
> + unsigned int num_planes, const char *types[],
> + unsigned long alignments[]);
> +void vb2_cma_cleanup_multi(struct vb2_alloc_ctx **alloc_ctxes);
> +
> +struct vb2_alloc_ctx *vb2_cma_init(struct device *dev, const char *type,
> + unsigned long alignment);
This function already exist.
> +void vb2_cma_cleanup(struct vb2_alloc_ctx *alloc_ctx);
Same
> +
> +extern const struct vb2_mem_ops vb2_cma_memops;
> +
> +#endif
> --
> 1.7.1.569.g6f426
>
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