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 void 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 } 18 19 static int e820_register_one(struct resource *res, void *data) 20 { 21 struct nd_region_desc ndr_desc; 22 struct nvdimm_bus *nvdimm_bus = data; 23 int nid = phys_to_target_node(res->start); 24 25 memset(&ndr_desc, 0, sizeof(ndr_desc)); 26 ndr_desc.res = res; 27 ndr_desc.numa_node = numa_map_to_online_node(nid); 28 ndr_desc.target_node = nid; 29 set_bit(ND_REGION_PAGEMAP, &ndr_desc.flags); 30 if (!nvdimm_pmem_region_create(nvdimm_bus, &ndr_desc)) 31 return -ENXIO; 32 return 0; 33 } 34 35 static int e820_pmem_probe(struct platform_device *pdev) 36 { 37 static struct nvdimm_bus_descriptor nd_desc; 38 struct device *dev = &pdev->dev; 39 struct nvdimm_bus *nvdimm_bus; 40 int rc = -ENXIO; 41 42 nd_desc.provider_name = "e820"; 43 nd_desc.module = THIS_MODULE; 44 nvdimm_bus = nvdimm_bus_register(dev, &nd_desc); 45 if (!nvdimm_bus) 46 goto err; 47 platform_set_drvdata(pdev, nvdimm_bus); 48 49 rc = walk_iomem_res_desc(IORES_DESC_PERSISTENT_MEMORY_LEGACY, 50 IORESOURCE_MEM, 0, -1, nvdimm_bus, e820_register_one); 51 if (rc) 52 goto err; 53 return 0; 54 err: 55 nvdimm_bus_unregister(nvdimm_bus); 56 dev_err(dev, "failed to register legacy persistent memory ranges\n"); 57 return rc; 58 } 59 60 static struct platform_driver e820_pmem_driver = { 61 .probe = e820_pmem_probe, 62 .remove_new = e820_pmem_remove, 63 .driver = { 64 .name = "e820_pmem", 65 }, 66 }; 67 68 module_platform_driver(e820_pmem_driver); 69 70 MODULE_ALIAS("platform:e820_pmem*"); 71 MODULE_DESCRIPTION("NVDIMM support for e820 type-12 memory"); 72 MODULE_LICENSE("GPL v2"); 73 MODULE_AUTHOR("Intel Corporation"); 74