1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2015, Christoph Hellwig. 4 * Copyright (c) 2015, Intel Corporation. 5 */ 6 #include <linux/platform_device.h> 7 #include <linux/memory_hotplug.h> 8 #include <linux/libnvdimm.h> 9 #include <linux/module.h> 10 #include <linux/numa.h> 11 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 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; 24 int nid = phys_to_target_node(res->start); 25 26 memset(&ndr_desc, 0, sizeof(ndr_desc)); 27 ndr_desc.res = res; 28 ndr_desc.numa_node = numa_map_to_online_node(nid); 29 ndr_desc.target_node = nid; 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 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; 41 int rc = -ENXIO; 42 43 nd_desc.provider_name = "e820"; 44 nd_desc.module = THIS_MODULE; 45 nvdimm_bus = nvdimm_bus_register(dev, &nd_desc); 46 if (!nvdimm_bus) 47 goto err; 48 platform_set_drvdata(pdev, nvdimm_bus); 49 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; 54 return 0; 55 err: 56 nvdimm_bus_unregister(nvdimm_bus); 57 dev_err(dev, "failed to register legacy persistent memory ranges\n"); 58 return rc; 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 69 module_platform_driver(e820_pmem_driver); 70 71 MODULE_ALIAS("platform:e820_pmem*"); 72 MODULE_LICENSE("GPL v2"); 73 MODULE_AUTHOR("Intel Corporation"); 74