Hi.
On Mon, Jun 20, 2011 at 4:50 PM, Marek Szyprowski
<m.szyprowski@xxxxxxxxxxx> wrote:
> -extern void *dma_alloc_coherent(struct device *, size_t, dma_addr_t *, gfp_t);
> +extern void *arm_dma_alloc(struct device *dev, size_t size, dma_addr_t *handle,
> + gfp_t gfp, struct dma_attrs *attrs);
> +
> +#define dma_alloc_coherent(d,s,h,f) dma_alloc_attrs(d,s,h,f,NULL)
> +
> +static inline void *dma_alloc_attrs(struct device *dev, size_t size,
> + dma_addr_t *dma_handle, gfp_t flag,
> + struct dma_attrs *attrs)
> +{
> + struct dma_map_ops *ops = get_dma_ops(dev);
> + void *cpu_addr;
> + BUG_ON(!ops);
> +
> + cpu_addr = ops->alloc(dev, size, dma_handle, flag, attrs);
> + debug_dma_alloc_coherent(dev, size, *dma_handle, cpu_addr);
> + return cpu_addr;
> +}
>
Apart from the necessity of alloc_attr,
I hope the callback implementations to check if a function pointer is NULL.
Suppose that a system want to use default ARM implementation of dma_alloc_*()
while it uses its own implementations of dma_map_*().
With your suggestion,
we have only one option:
void *my_alloc(...) {
return dma_alloc_coherent(NULL, ...);
}
struct dma_map_ops ops = {
.alloc_coherent = &my_alloc,
...
};
I think the following method is simpler:
struct dma_map_ops ops = {
.alloc_coherent = NULL,
...
};
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