| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (c) 2015, Christoph Hellwig. |
| 3 | * Copyright (c) 2015, Intel Corporation. |
| 4 | */ |
| 5 | #include <linux/platform_device.h> |
| 6 | #include <linux/memory_hotplug.h> |
| 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 | |
| 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 | |
| 41 | static int e820_register_one(struct resource *res, void *data) |
| 42 | { |
| 43 | struct nd_region_desc ndr_desc; |
| 44 | struct nvdimm_bus *nvdimm_bus = data; |
| 45 | |
| 46 | memset(&ndr_desc, 0, sizeof(ndr_desc)); |
| 47 | ndr_desc.res = res; |
| 48 | ndr_desc.attr_groups = e820_pmem_region_attribute_groups; |
| 49 | ndr_desc.numa_node = e820_range_to_nid(res->start); |
| 50 | set_bit(ND_REGION_PAGEMAP, &ndr_desc.flags); |
| 51 | if (!nvdimm_pmem_region_create(nvdimm_bus, &ndr_desc)) |
| 52 | return -ENXIO; |
| 53 | return 0; |
| 54 | } |
| 55 | |
| 56 | static int e820_pmem_probe(struct platform_device *pdev) |
| 57 | { |
| 58 | static struct nvdimm_bus_descriptor nd_desc; |
| 59 | struct device *dev = &pdev->dev; |
| 60 | struct nvdimm_bus *nvdimm_bus; |
| 61 | int rc = -ENXIO; |
| 62 | |
| 63 | nd_desc.attr_groups = e820_pmem_attribute_groups; |
| 64 | nd_desc.provider_name = "e820"; |
| 65 | nd_desc.module = THIS_MODULE; |
| 66 | nvdimm_bus = nvdimm_bus_register(dev, &nd_desc); |
| 67 | if (!nvdimm_bus) |
| 68 | goto err; |
| 69 | platform_set_drvdata(pdev, nvdimm_bus); |
| 70 | |
| 71 | rc = walk_iomem_res_desc(IORES_DESC_PERSISTENT_MEMORY_LEGACY, |
| 72 | IORESOURCE_MEM, 0, -1, nvdimm_bus, e820_register_one); |
| 73 | if (rc) |
| 74 | goto err; |
| 75 | return 0; |
| 76 | err: |
| 77 | nvdimm_bus_unregister(nvdimm_bus); |
| 78 | dev_err(dev, "failed to register legacy persistent memory ranges\n"); |
| 79 | return rc; |
| 80 | } |
| 81 | |
| 82 | static struct platform_driver e820_pmem_driver = { |
| 83 | .probe = e820_pmem_probe, |
| 84 | .remove = e820_pmem_remove, |
| 85 | .driver = { |
| 86 | .name = "e820_pmem", |
| 87 | }, |
| 88 | }; |
| 89 | |
| 90 | module_platform_driver(e820_pmem_driver); |
| 91 | |
| 92 | MODULE_ALIAS("platform:e820_pmem*"); |
| 93 | MODULE_LICENSE("GPL v2"); |
| 94 | MODULE_AUTHOR("Intel Corporation"); |