[mirror_ubuntu-hirsute-kernel.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 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.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.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
7a67832c DW	11	static int e820_pmem_remove(struct platform_device *pdev)
	12	{
	13	struct nvdimm_bus *nvdimm_bus = platform_get_drvdata(pdev);
	14
	15	nvdimm_bus_unregister(nvdimm_bus);
	16	return 0;
	17	}
	18
f7256dc0 DW	19	#ifdef CONFIG_MEMORY_HOTPLUG
	20	static int e820_range_to_nid(resource_size_t addr)
	21	{
	22	return memory_add_physaddr_to_nid(addr);
	23	}
	24	#else
	25	static int e820_range_to_nid(resource_size_t addr)
	26	{
	27	return NUMA_NO_NODE;
	28	}
	29	#endif
	30
d76401ad DW	31	static int e820_register_one(struct resource res, void data)
	32	{
	33	struct nd_region_desc ndr_desc;
	34	struct nvdimm_bus *nvdimm_bus = data;
	35
	36	memset(&ndr_desc, 0, sizeof(ndr_desc));
	37	ndr_desc.res = res;
d76401ad	38	ndr_desc.numa_node = e820_range_to_nid(res->start);
8fc5c735	39	ndr_desc.target_node = ndr_desc.numa_node;
d76401ad DW	40	set_bit(ND_REGION_PAGEMAP, &ndr_desc.flags);
	41	if (!nvdimm_pmem_region_create(nvdimm_bus, &ndr_desc))
	42	return -ENXIO;
	43	return 0;
	44	}
	45
7a67832c DW	46	static int e820_pmem_probe(struct platform_device *pdev)
	47	{
	48	static struct nvdimm_bus_descriptor nd_desc;
	49	struct device *dev = &pdev->dev;
	50	struct nvdimm_bus *nvdimm_bus;
d76401ad	51	int rc = -ENXIO;
7a67832c	52
7a67832c	53	nd_desc.provider_name = "e820";
bc9775d8	54	nd_desc.module = THIS_MODULE;
7a67832c DW	55	nvdimm_bus = nvdimm_bus_register(dev, &nd_desc);
	56	if (!nvdimm_bus)
	57	goto err;
	58	platform_set_drvdata(pdev, nvdimm_bus);
	59
d76401ad DW	60	rc = walk_iomem_res_desc(IORES_DESC_PERSISTENT_MEMORY_LEGACY,
	61	IORESOURCE_MEM, 0, -1, nvdimm_bus, e820_register_one);
	62	if (rc)
	63	goto err;
7a67832c	64	return 0;
d76401ad	65	err:
7a67832c DW	66	nvdimm_bus_unregister(nvdimm_bus);
7a67832c DW	67	dev_err(dev, "failed to register legacy persistent memory ranges\n");
d76401ad	68	return rc;
7a67832c DW	69	}
	70
	71	static struct platform_driver e820_pmem_driver = {
	72	.probe = e820_pmem_probe,
	73	.remove = e820_pmem_remove,
	74	.driver = {
	75	.name = "e820_pmem",
	76	},
	77	};
	78
3a71b3c8	79	module_platform_driver(e820_pmem_driver);
7a67832c DW	80
	81	MODULE_ALIAS("platform:e820_pmem*");
	82	MODULE_LICENSE("GPL v2");
	83	MODULE_AUTHOR("Intel Corporation");