e820.c 1.8 KB

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  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. static int e820_pmem_remove(struct platform_device *pdev)
  12. {
  13. struct nvdimm_bus *nvdimm_bus = platform_get_drvdata(pdev);
  14. nvdimm_bus_unregister(nvdimm_bus);
  15. return 0;
  16. }
  17. static int e820_register_one(struct resource *res, void *data)
  18. {
  19. struct nd_region_desc ndr_desc;
  20. struct nvdimm_bus *nvdimm_bus = data;
  21. int nid = phys_to_target_node(res->start);
  22. memset(&ndr_desc, 0, sizeof(ndr_desc));
  23. ndr_desc.res = res;
  24. ndr_desc.numa_node = numa_map_to_online_node(nid);
  25. ndr_desc.target_node = nid;
  26. set_bit(ND_REGION_PAGEMAP, &ndr_desc.flags);
  27. if (!nvdimm_pmem_region_create(nvdimm_bus, &ndr_desc))
  28. return -ENXIO;
  29. return 0;
  30. }
  31. static int e820_pmem_probe(struct platform_device *pdev)
  32. {
  33. static struct nvdimm_bus_descriptor nd_desc;
  34. struct device *dev = &pdev->dev;
  35. struct nvdimm_bus *nvdimm_bus;
  36. int rc = -ENXIO;
  37. nd_desc.provider_name = "e820";
  38. nd_desc.module = THIS_MODULE;
  39. nvdimm_bus = nvdimm_bus_register(dev, &nd_desc);
  40. if (!nvdimm_bus)
  41. goto err;
  42. platform_set_drvdata(pdev, nvdimm_bus);
  43. rc = walk_iomem_res_desc(IORES_DESC_PERSISTENT_MEMORY_LEGACY,
  44. IORESOURCE_MEM, 0, -1, nvdimm_bus, e820_register_one);
  45. if (rc)
  46. goto err;
  47. return 0;
  48. err:
  49. nvdimm_bus_unregister(nvdimm_bus);
  50. dev_err(dev, "failed to register legacy persistent memory ranges\n");
  51. return rc;
  52. }
  53. static struct platform_driver e820_pmem_driver = {
  54. .probe = e820_pmem_probe,
  55. .remove = e820_pmem_remove,
  56. .driver = {
  57. .name = "e820_pmem",
  58. },
  59. };
  60. module_platform_driver(e820_pmem_driver);
  61. MODULE_ALIAS("platform:e820_pmem*");
  62. MODULE_LICENSE("GPL v2");
  63. MODULE_AUTHOR("Intel Corporation");