| /* |
| * 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); |
| 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"); |