On Sunday 27 April 2014 13:07:47 Shaik Ameer Basha wrote:
> @@ -542,14 +592,41 @@ static int __init exynos_sysmmu_probe(struct
> platform_device *pdev)
> }
> }
>
> + /* Relation between master and System MMU is 1:1. */
> + node = of_parse_phandle(dev->of_node, "mmu-masters", 0);
> + if (node) {
> + struct platform_device *master = of_find_device_by_node(node);
> +
> + if (!master) {
> + dev_err(dev, "%s: mmu-master '%s' not found\n",
> + __func__, node->name);
> + return -EINVAL;
> + }
> +
> + if (master->dev.archdata.iommu != NULL) {
> + dev_err(dev, "%s: '%s' is master of other MMU\n",
> + __func__, node->name);
> + return -EINVAL;
> + }
> +
> + /*
> + * archdata.iommu will be initialized with exynos_iommu_client
> + * in sysmmu_hook_driver_register().
> + */
> + master->dev.archdata.iommu = dev;
> + }
I think parsing of generic properties like this shouldn't be done
by the individual driver. It belongs into core iommu code and should
be done when the devices are probed.
> +
> +static struct notifier_block sysmmu_notifier = {
> + .notifier_call = &sysmmu_hook_driver_register,
> +};
> +
> +static int __init exynos_iommu_prepare(void)
> +{
> + static bool registered = false;
> + int ret;
> +
> + if (registered)
> + return 0;
> +
> + ret = bus_register_notifier(&platform_bus_type, &sysmmu_notifier);
> + if (!ret)
> + registered = true;
> + else
> + pr_err("Failed to register sysmmu_notifier\n");
> +
> + return ret;
> +}
This also means we should not have notifiers. Put it into core code to
make sure all IOMMUs are handled the same way.
Arnd
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