23.04.2021 19:32, Thierry Reding пишет:
> +void of_iommu_get_resv_regions(struct device *dev, struct list_head *list)
> +{
> + struct of_phandle_iterator it;
> + int err;
> +
> + of_for_each_phandle(&it, err, dev->of_node, "memory-region",
> "#memory-region-cells", 0) {
> + struct iommu_resv_region *region;
> + struct of_phandle_args args;
> + struct resource res;
> +
> + args.args_count = of_phandle_iterator_args(&it, args.args,
> MAX_PHANDLE_ARGS);
> +
> + err = of_address_to_resource(it.node, 0, &res);
> + if (err < 0) {
> + dev_err(dev, "failed to parse memory region %pOF: %d\n",
> + it.node, err);
> + continue;
> + }
> +
> + if (args.args_count > 0) {
> + /*
> + * Active memory regions are expected to be accessed by
> hardware during
> + * boot and must therefore have an identity mapping
> created prior to the
> + * driver taking control of the hardware. This ensures
> that non-quiescent
> + * hardware doesn't cause IOMMU faults during boot.
> + */
> + if (args.args[0] & MEMORY_REGION_IDENTITY_MAPPING) {
> + region = iommu_alloc_resv_region(res.start,
> resource_size(&res),
> + IOMMU_READ |
> IOMMU_WRITE,
> +
> IOMMU_RESV_DIRECT_RELAXABLE);
> + if (!region)
> + continue;
> +
> + list_add_tail(®ion->list, list);
> + }
> + }
> + }
> +}
> +EXPORT_SYMBOL(of_iommu_get_resv_regions);
Any reason why this is not EXPORT_SYMBOL_GPL? I'm curious what is the
logic behind the OF symbols in general since it looks like half of them
are GPL.
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