[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>
#include <linux/numa.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;
}

static int e820_register_one(struct resource *res, void *data)
{
	struct nd_region_desc ndr_desc;
	struct nvdimm_bus *nvdimm_bus = data;
	int nid = phys_to_target_node(res->start);

	memset(&ndr_desc, 0, sizeof(ndr_desc));
	ndr_desc.res = res;
	ndr_desc.numa_node = numa_map_to_online_node(nid);
	ndr_desc.target_node = nid;
	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>
7a67832c DW	9	#include <linux/module.h>
7b27a862	10	#include <linux/numa.h>
7a67832c	11
7a67832c DW	12	static int e820_pmem_remove(struct platform_device *pdev)
	13	{
	14	struct nvdimm_bus *nvdimm_bus = platform_get_drvdata(pdev);
	15
	16	nvdimm_bus_unregister(nvdimm_bus);
	17	return 0;
	18	}
	19
d76401ad DW	20	static int e820_register_one(struct resource res, void data)
	21	{
	22	struct nd_region_desc ndr_desc;
	23	struct nvdimm_bus *nvdimm_bus = data;
7b27a862	24	int nid = phys_to_target_node(res->start);
d76401ad DW	25
	26	memset(&ndr_desc, 0, sizeof(ndr_desc));
	27	ndr_desc.res = res;
7b27a862 DW	28	ndr_desc.numa_node = numa_map_to_online_node(nid);
7b27a862 DW	29	ndr_desc.target_node = nid;
d76401ad DW	30	set_bit(ND_REGION_PAGEMAP, &ndr_desc.flags);
	31	if (!nvdimm_pmem_region_create(nvdimm_bus, &ndr_desc))
	32	return -ENXIO;
	33	return 0;
	34	}
	35
7a67832c DW	36	static int e820_pmem_probe(struct platform_device *pdev)
	37	{
	38	static struct nvdimm_bus_descriptor nd_desc;
	39	struct device *dev = &pdev->dev;
	40	struct nvdimm_bus *nvdimm_bus;
d76401ad	41	int rc = -ENXIO;
7a67832c	42
7a67832c	43	nd_desc.provider_name = "e820";
bc9775d8	44	nd_desc.module = THIS_MODULE;
7a67832c DW	45	nvdimm_bus = nvdimm_bus_register(dev, &nd_desc);
	46	if (!nvdimm_bus)
	47	goto err;
	48	platform_set_drvdata(pdev, nvdimm_bus);
	49
d76401ad DW	50	rc = walk_iomem_res_desc(IORES_DESC_PERSISTENT_MEMORY_LEGACY,
	51	IORESOURCE_MEM, 0, -1, nvdimm_bus, e820_register_one);
	52	if (rc)
	53	goto err;
7a67832c	54	return 0;
d76401ad	55	err:
7a67832c DW	56	nvdimm_bus_unregister(nvdimm_bus);
7a67832c DW	57	dev_err(dev, "failed to register legacy persistent memory ranges\n");
d76401ad	58	return rc;
7a67832c DW	59	}
	60
	61	static struct platform_driver e820_pmem_driver = {
	62	.probe = e820_pmem_probe,
	63	.remove = e820_pmem_remove,
	64	.driver = {
	65	.name = "e820_pmem",
	66	},
	67	};
	68
3a71b3c8	69	module_platform_driver(e820_pmem_driver);
7a67832c DW	70
	71	MODULE_ALIAS("platform:e820_pmem*");
	72	MODULE_LICENSE("GPL v2");
	73	MODULE_AUTHOR("Intel Corporation");