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"); 95