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 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");