drivers/nvdimm/e820.c

   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");