/* * Copyright (c) 2015, Christoph Hellwig. * Copyright (c) 2015, Intel Corporation. */ #include <linux/platform_device.h> #include <linux/memory_hotplug.h> #include <linux/libnvdimm.h> #include <linux/module.h> static const struct attribute_group *e820_pmem_attribute_groups[] = { &nvdimm_bus_attribute_group, NULL, }; static const struct attribute_group *e820_pmem_region_attribute_groups[] = { &nd_region_attribute_group, &nd_device_attribute_group, NULL, }; static int e820_pmem_remove(struct platform_device *pdev) { struct nvdimm_bus *nvdimm_bus = platform_get_drvdata(pdev); nvdimm_bus_unregister(nvdimm_bus); return 0; } #ifdef CONFIG_MEMORY_HOTPLUG static int e820_range_to_nid(resource_size_t addr) { return memory_add_physaddr_to_nid(addr); } #else static int e820_range_to_nid(resource_size_t addr) { return NUMA_NO_NODE; } #endif static int e820_pmem_probe(struct platform_device *pdev) { static struct nvdimm_bus_descriptor nd_desc; struct device *dev = &pdev->dev; struct nvdimm_bus *nvdimm_bus; struct resource *p; nd_desc.attr_groups = e820_pmem_attribute_groups; nd_desc.provider_name = "e820"; nd_desc.module = THIS_MODULE; nvdimm_bus = nvdimm_bus_register(dev, &nd_desc); if (!nvdimm_bus) goto err; platform_set_drvdata(pdev, nvdimm_bus); for (p = iomem_resource.child; p ; p = p->sibling) { struct nd_region_desc ndr_desc; if (p->desc != IORES_DESC_PERSISTENT_MEMORY_LEGACY) continue; memset(&ndr_desc, 0, sizeof(ndr_desc)); ndr_desc.res = p; ndr_desc.attr_groups = e820_pmem_region_attribute_groups; ndr_desc.numa_node = e820_range_to_nid(p->start); set_bit(ND_REGION_PAGEMAP, &ndr_desc.flags); if (!nvdimm_pmem_region_create(nvdimm_bus, &ndr_desc)) goto err; } return 0; err: nvdimm_bus_unregister(nvdimm_bus); dev_err(dev, "failed to register legacy persistent memory ranges\n"); return -ENXIO; } static struct platform_driver e820_pmem_driver = { .probe = e820_pmem_probe, .remove = e820_pmem_remove, .driver = { .name = "e820_pmem", }, }; module_platform_driver(e820_pmem_driver); MODULE_ALIAS("platform:e820_pmem*"); MODULE_LICENSE("GPL v2"); MODULE_AUTHOR("Intel Corporation");