drivers/nvdimm/e820.c

   1 /*
   2  * Copyright (c) 2015, Christoph Hellwig.
   3  * Copyright (c) 2015, Intel Corporation.
   4  */
   5 #include <linux/platform_device.h>
   6 #include <linux/libnvdimm.h>
   7 #include <linux/module.h>
   8
   9 static const struct attribute_group *e820_pmem_attribute_groups[] = {
  10         &nvdimm_bus_attribute_group,
  11         NULL,
  12 };
  13
  14 static const struct attribute_group *e820_pmem_region_attribute_groups[] = {
  15         &nd_region_attribute_group,
  16         &nd_device_attribute_group,
  17         NULL,
  18 };
  19
  20 static int e820_pmem_remove(struct platform_device *pdev)
  21 {
  22         struct nvdimm_bus *nvdimm_bus = platform_get_drvdata(pdev);
  23
  24         nvdimm_bus_unregister(nvdimm_bus);
  25         return 0;
  26 }
  27
  28 static int e820_pmem_probe(struct platform_device *pdev)
  29 {
  30         static struct nvdimm_bus_descriptor nd_desc;
  31         struct device *dev = &pdev->dev;
  32         struct nvdimm_bus *nvdimm_bus;
  33         struct resource *p;
  34
  35         nd_desc.attr_groups = e820_pmem_attribute_groups;
  36         nd_desc.provider_name = "e820";
  37         nvdimm_bus = nvdimm_bus_register(dev, &nd_desc);
  38         if (!nvdimm_bus)
  39                 goto err;
  40         platform_set_drvdata(pdev, nvdimm_bus);
  41
  42         for (p = iomem_resource.child; p ; p = p->sibling) {
  43                 struct nd_region_desc ndr_desc;
  44
  45                 if (strncmp(p->name, "Persistent Memory (legacy)", 26) != 0)
  46                         continue;
  47
  48                 memset(&ndr_desc, 0, sizeof(ndr_desc));
  49                 ndr_desc.res = p;
  50                 ndr_desc.attr_groups = e820_pmem_region_attribute_groups;
  51                 ndr_desc.numa_node = NUMA_NO_NODE;
  52                 set_bit(ND_REGION_PAGEMAP, &ndr_desc.flags);
  53                 if (!nvdimm_pmem_region_create(nvdimm_bus, &ndr_desc))
  54                         goto err;
  55         }
  56
  57         return 0;
  58
  59  err:
  60         nvdimm_bus_unregister(nvdimm_bus);
  61         dev_err(dev, "failed to register legacy persistent memory ranges\n");
  62         return -ENXIO;
  63 }
  64
  65 static struct platform_driver e820_pmem_driver = {
  66         .probe = e820_pmem_probe,
  67         .remove = e820_pmem_remove,
  68         .driver = {
  69                 .name = "e820_pmem",
  70         },
  71 };
  72
  73 static __init int e820_pmem_init(void)
  74 {
  75         return platform_driver_register(&e820_pmem_driver);
  76 }
  77
  78 static __exit void e820_pmem_exit(void)
  79 {
  80         platform_driver_unregister(&e820_pmem_driver);
  81 }
  82
  83 MODULE_ALIAS("platform:e820_pmem*");
  84 MODULE_LICENSE("GPL v2");
  85 MODULE_AUTHOR("Intel Corporation");
  86 module_init(e820_pmem_init);
  87 module_exit(e820_pmem_exit);