[mirror_ubuntu-zesty-kernel.git] / drivers / nvdimm / e820.c

/*
 * Copyright (c) 2015, Christoph Hellwig.
 * Copyright (c) 2015, Intel Corporation.
 */
#include <linux/platform_device.h>
#include <linux/memory_hotplug.h>
#include <linux/libnvdimm.h>
#include <linux/module.h>

static const struct attribute_group *e820_pmem_attribute_groups[] = {
	&nvdimm_bus_attribute_group,
	NULL,
};

static const struct attribute_group *e820_pmem_region_attribute_groups[] = {
	&nd_region_attribute_group,
	&nd_device_attribute_group,
	NULL,
};

static int e820_pmem_remove(struct platform_device *pdev)
{
	struct nvdimm_bus *nvdimm_bus = platform_get_drvdata(pdev);

	nvdimm_bus_unregister(nvdimm_bus);
	return 0;
}

#ifdef CONFIG_MEMORY_HOTPLUG
static int e820_range_to_nid(resource_size_t addr)
{
	return memory_add_physaddr_to_nid(addr);
}
#else
static int e820_range_to_nid(resource_size_t addr)
{
	return NUMA_NO_NODE;
}
#endif

static int e820_pmem_probe(struct platform_device *pdev)
{
	static struct nvdimm_bus_descriptor nd_desc;
	struct device *dev = &pdev->dev;
	struct nvdimm_bus *nvdimm_bus;
	struct resource *p;

	nd_desc.attr_groups = e820_pmem_attribute_groups;
	nd_desc.provider_name = "e820";
	nd_desc.module = THIS_MODULE;
	nvdimm_bus = nvdimm_bus_register(dev, &nd_desc);
	if (!nvdimm_bus)
		goto err;
	platform_set_drvdata(pdev, nvdimm_bus);

	for (p = iomem_resource.child; p ; p = p->sibling) {
		struct nd_region_desc ndr_desc;

		if (p->desc != IORES_DESC_PERSISTENT_MEMORY_LEGACY)
			continue;

		memset(&ndr_desc, 0, sizeof(ndr_desc));
		ndr_desc.res = p;
		ndr_desc.attr_groups = e820_pmem_region_attribute_groups;
		ndr_desc.numa_node = e820_range_to_nid(p->start);
		set_bit(ND_REGION_PAGEMAP, &ndr_desc.flags);
		if (!nvdimm_pmem_region_create(nvdimm_bus, &ndr_desc))
			goto err;
	}

	return 0;

 err:
	nvdimm_bus_unregister(nvdimm_bus);
	dev_err(dev, "failed to register legacy persistent memory ranges\n");
	return -ENXIO;
}

static struct platform_driver e820_pmem_driver = {
	.probe = e820_pmem_probe,
	.remove = e820_pmem_remove,
	.driver = {
		.name = "e820_pmem",
	},
};

module_platform_driver(e820_pmem_driver);

MODULE_ALIAS("platform:e820_pmem*");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Intel Corporation");
Commit	Line	Data
7a67832c DW	1	/*
	2	* Copyright (c) 2015, Christoph Hellwig.
	3	* Copyright (c) 2015, Intel Corporation.
	4	*/
	5	#include <linux/platform_device.h>
f7256dc0	6	#include <linux/memory_hotplug.h>
7a67832c DW	7	#include <linux/libnvdimm.h>
	8	#include <linux/module.h>
	9
	10	static const struct attribute_group *e820_pmem_attribute_groups[] = {
	11	&nvdimm_bus_attribute_group,
	12	NULL,
	13	};
	14
	15	static const struct attribute_group *e820_pmem_region_attribute_groups[] = {
	16	&nd_region_attribute_group,
	17	&nd_device_attribute_group,
	18	NULL,
	19	};
	20
	21	static int e820_pmem_remove(struct platform_device *pdev)
	22	{
	23	struct nvdimm_bus *nvdimm_bus = platform_get_drvdata(pdev);
	24
	25	nvdimm_bus_unregister(nvdimm_bus);
	26	return 0;
	27	}
	28
f7256dc0 DW	29	#ifdef CONFIG_MEMORY_HOTPLUG
	30	static int e820_range_to_nid(resource_size_t addr)
	31	{
	32	return memory_add_physaddr_to_nid(addr);
	33	}
	34	#else
	35	static int e820_range_to_nid(resource_size_t addr)
	36	{
	37	return NUMA_NO_NODE;
	38	}
	39	#endif
	40
7a67832c DW	41	static int e820_pmem_probe(struct platform_device *pdev)
	42	{
	43	static struct nvdimm_bus_descriptor nd_desc;
	44	struct device *dev = &pdev->dev;
	45	struct nvdimm_bus *nvdimm_bus;
	46	struct resource *p;
	47
	48	nd_desc.attr_groups = e820_pmem_attribute_groups;
	49	nd_desc.provider_name = "e820";
bc9775d8	50	nd_desc.module = THIS_MODULE;
7a67832c DW	51	nvdimm_bus = nvdimm_bus_register(dev, &nd_desc);
	52	if (!nvdimm_bus)
	53	goto err;
	54	platform_set_drvdata(pdev, nvdimm_bus);
	55
	56	for (p = iomem_resource.child; p ; p = p->sibling) {
	57	struct nd_region_desc ndr_desc;
	58
f0f4711a	59	if (p->desc != IORES_DESC_PERSISTENT_MEMORY_LEGACY)
7a67832c DW	60	continue;
	61
	62	memset(&ndr_desc, 0, sizeof(ndr_desc));
	63	ndr_desc.res = p;
	64	ndr_desc.attr_groups = e820_pmem_region_attribute_groups;
f7256dc0	65	ndr_desc.numa_node = e820_range_to_nid(p->start);
004f1afb	66	set_bit(ND_REGION_PAGEMAP, &ndr_desc.flags);
7a67832c DW	67	if (!nvdimm_pmem_region_create(nvdimm_bus, &ndr_desc))
	68	goto err;
	69	}
	70
	71	return 0;
	72
	73	err:
	74	nvdimm_bus_unregister(nvdimm_bus);
	75	dev_err(dev, "failed to register legacy persistent memory ranges\n");
	76	return -ENXIO;
	77	}
	78
	79	static struct platform_driver e820_pmem_driver = {
	80	.probe = e820_pmem_probe,
	81	.remove = e820_pmem_remove,
	82	.driver = {
	83	.name = "e820_pmem",
	84	},
	85	};
	86
3a71b3c8	87	module_platform_driver(e820_pmem_driver);
7a67832c DW	88
	89	MODULE_ALIAS("platform:e820_pmem*");
	90	MODULE_LICENSE("GPL v2");
	91	MODULE_AUTHOR("Intel Corporation");