On Thu, 11 Sep 2014 13:22:40 +0200 Marek Szyprowski <[email protected]>
wrote:
> Initialization procedure of dma coherent pool has been split into two
> parts, so memory pool can now be initialized without assigning to
> particular struct device. Then initialized region can be assigned to
> more than one struct device. To protect from concurent allocations from
> different devices, a spinlock has been added to dma_coherent_mem
> structure. The last part of this patch adds support for handling
> 'shared-dma-pool' reserved-memory device tree nodes.
>
> ...
>
> +static int rmem_dma_device_init(struct reserved_mem *rmem, struct device
> *dev)
> +{
> + struct dma_coherent_mem *mem = rmem->priv;
> + if (!mem &&
> + dma_init_coherent_memory(rmem->base, rmem->base, rmem->size,
> + DMA_MEMORY_MAP | DMA_MEMORY_EXCLUSIVE,
> + &mem) != DMA_MEMORY_MAP) {
> + pr_info("Reserved memory: failed to init DMA memory pool at
> %pa, size %ld MiB\n",
> + &rmem->base, (unsigned long)rmem->size / SZ_1M);
pr_info() seems inappropriate here. It's an error, so pr_err()?
> + return -ENODEV;
> + }
> + rmem->priv = mem;
> + dma_assign_coherent_memory(dev, mem);
> + return 0;
> +}
>
> ...
>
> +static int __init rmem_dma_setup(struct reserved_mem *rmem)
> +{
> + unsigned long node = rmem->fdt_node;
> +
> + if (of_get_flat_dt_prop(node, "reusable", NULL))
> + return -EINVAL;
> +
> +#ifdef CONFIG_ARM
> + if (!of_get_flat_dt_prop(node, "no-map", NULL)) {
> + pr_info("Reserved memory: regions without no-map are not yet
> supported\n");
Same here.
> + return -EINVAL;
> + }
> +#endif
> +
> + rmem->ops = &rmem_dma_ops;
> + pr_info("Reserved memory: created DMA memory pool at %pa, size %ld
> MiB\n",
> + &rmem->base, (unsigned long)rmem->size / SZ_1M);
This *is* an appropriate use of pr_info().
> + return 0;
> +}
> +RESERVEDMEM_OF_DECLARE(dma, "shared-dma-pool", rmem_dma_setup);
> +#endif
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