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_pmem_probe(struct platform_device *pdev) 42 { 43 static struct nvdimm_bus_descriptor nd_desc; 44 struct device *dev = &pdev->dev; 45 struct nvdimm_bus *nvdimm_bus; 46 struct resource *p; 47 48 nd_desc.attr_groups = e820_pmem_attribute_groups; 49 nd_desc.provider_name = "e820"; 50 nvdimm_bus = nvdimm_bus_register(dev, &nd_desc); 51 if (!nvdimm_bus) 52 goto err; 53 platform_set_drvdata(pdev, nvdimm_bus); 54 55 for (p = iomem_resource.child; p ; p = p->sibling) { 56 struct nd_region_desc ndr_desc; 57 58 if (strncmp(p->name, "Persistent Memory (legacy)", 26) != 0) 59 continue; 60 61 memset(&ndr_desc, 0, sizeof(ndr_desc)); 62 ndr_desc.res = p; 63 ndr_desc.attr_groups = e820_pmem_region_attribute_groups; 64 ndr_desc.numa_node = e820_range_to_nid(p->start); 65 set_bit(ND_REGION_PAGEMAP, &ndr_desc.flags); 66 if (!nvdimm_pmem_region_create(nvdimm_bus, &ndr_desc)) 67 goto err; 68 } 69 70 return 0; 71 72 err: 73 nvdimm_bus_unregister(nvdimm_bus); 74 dev_err(dev, "failed to register legacy persistent memory ranges\n"); 75 return -ENXIO; 76 } 77 78 static struct platform_driver e820_pmem_driver = { 79 .probe = e820_pmem_probe, 80 .remove = e820_pmem_remove, 81 .driver = { 82 .name = "e820_pmem", 83 }, 84 }; 85 86 static __init int e820_pmem_init(void) 87 { 88 return platform_driver_register(&e820_pmem_driver); 89 } 90 91 static __exit void e820_pmem_exit(void) 92 { 93 platform_driver_unregister(&e820_pmem_driver); 94 } 95 96 MODULE_ALIAS("platform:e820_pmem*"); 97 MODULE_LICENSE("GPL v2"); 98 MODULE_AUTHOR("Intel Corporation"); 99 module_init(e820_pmem_init); 100 module_exit(e820_pmem_exit); 101