[linux-2.6-block.git] / drivers / nvdimm / e820.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * 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_register_one(struct resource *res, void *data)
{
	struct nd_region_desc ndr_desc;
	struct nvdimm_bus *nvdimm_bus = data;

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

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;
	int rc = -ENXIO;

	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);

	rc = walk_iomem_res_desc(IORES_DESC_PERSISTENT_MEMORY_LEGACY,
			IORESOURCE_MEM, 0, -1, nvdimm_bus, e820_register_one);
	if (rc)
		goto err;
	return 0;
err:
	nvdimm_bus_unregister(nvdimm_bus);
	dev_err(dev, "failed to register legacy persistent memory ranges\n");
	return rc;
}

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
09c434b8	1	// SPDX-License-Identifier: GPL-2.0-only
7a67832c DW	2	/*
	3	* Copyright (c) 2015, Christoph Hellwig.
	4	* Copyright (c) 2015, Intel Corporation.
	5	*/
	6	#include <linux/platform_device.h>
f7256dc0	7	#include <linux/memory_hotplug.h>
7a67832c DW	8	#include <linux/libnvdimm.h>
	9	#include <linux/module.h>
	10
	11	static const struct attribute_group *e820_pmem_attribute_groups[] = {
	12	&nvdimm_bus_attribute_group,
	13	NULL,
	14	};
	15
	16	static const struct attribute_group *e820_pmem_region_attribute_groups[] = {
	17	&nd_region_attribute_group,
	18	&nd_device_attribute_group,
	19	NULL,
	20	};
	21
	22	static int e820_pmem_remove(struct platform_device *pdev)
	23	{
	24	struct nvdimm_bus *nvdimm_bus = platform_get_drvdata(pdev);
	25
	26	nvdimm_bus_unregister(nvdimm_bus);
	27	return 0;
	28	}
	29
f7256dc0 DW	30	#ifdef CONFIG_MEMORY_HOTPLUG
	31	static int e820_range_to_nid(resource_size_t addr)
	32	{
	33	return memory_add_physaddr_to_nid(addr);
	34	}
	35	#else
	36	static int e820_range_to_nid(resource_size_t addr)
	37	{
	38	return NUMA_NO_NODE;
	39	}
	40	#endif
	41
d76401ad DW	42	static int e820_register_one(struct resource res, void data)
	43	{
	44	struct nd_region_desc ndr_desc;
	45	struct nvdimm_bus *nvdimm_bus = data;
	46
	47	memset(&ndr_desc, 0, sizeof(ndr_desc));
	48	ndr_desc.res = res;
	49	ndr_desc.attr_groups = e820_pmem_region_attribute_groups;
	50	ndr_desc.numa_node = e820_range_to_nid(res->start);
8fc5c735	51	ndr_desc.target_node = ndr_desc.numa_node;
d76401ad DW	52	set_bit(ND_REGION_PAGEMAP, &ndr_desc.flags);
	53	if (!nvdimm_pmem_region_create(nvdimm_bus, &ndr_desc))
	54	return -ENXIO;
	55	return 0;
	56	}
	57
7a67832c DW	58	static int e820_pmem_probe(struct platform_device *pdev)
	59	{
	60	static struct nvdimm_bus_descriptor nd_desc;
	61	struct device *dev = &pdev->dev;
	62	struct nvdimm_bus *nvdimm_bus;
d76401ad	63	int rc = -ENXIO;
7a67832c DW	64
	65	nd_desc.attr_groups = e820_pmem_attribute_groups;
	66	nd_desc.provider_name = "e820";
bc9775d8	67	nd_desc.module = THIS_MODULE;
7a67832c DW	68	nvdimm_bus = nvdimm_bus_register(dev, &nd_desc);
	69	if (!nvdimm_bus)
	70	goto err;
	71	platform_set_drvdata(pdev, nvdimm_bus);
	72
d76401ad DW	73	rc = walk_iomem_res_desc(IORES_DESC_PERSISTENT_MEMORY_LEGACY,
	74	IORESOURCE_MEM, 0, -1, nvdimm_bus, e820_register_one);
	75	if (rc)
	76	goto err;
7a67832c	77	return 0;
d76401ad	78	err:
7a67832c DW	79	nvdimm_bus_unregister(nvdimm_bus);
7a67832c DW	80	dev_err(dev, "failed to register legacy persistent memory ranges\n");
d76401ad	81	return rc;
7a67832c DW	82	}
	83
	84	static struct platform_driver e820_pmem_driver = {
	85	.probe = e820_pmem_probe,
	86	.remove = e820_pmem_remove,
	87	.driver = {
	88	.name = "e820_pmem",
	89	},
	90	};
	91
3a71b3c8	92	module_platform_driver(e820_pmem_driver);
7a67832c DW	93
	94	MODULE_ALIAS("platform:e820_pmem*");
	95	MODULE_LICENSE("GPL v2");
	96	MODULE_AUTHOR("Intel Corporation");