Eric Lee / smarc-fsl-linux-kernel

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drivers/nvdimm/e820.c 2.33 KB
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7a67832c7   Dan Williams   libnvdimm, e820: ... 
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  /*
   * Copyright (c) 2015, Christoph Hellwig.
   * Copyright (c) 2015, Intel Corporation.
   */
  #include <linux/platform_device.h>
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  #include <linux/memory_hotplug.h>
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  #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;
  }
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  #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
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  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";
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  	nd_desc.module = THIS_MODULE;
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  	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;
f0f4711aa   Toshi Kani   x86, kexec, nvdim... 
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  		if (p->desc != IORES_DESC_PERSISTENT_MEMORY_LEGACY)
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  			continue;
  
  		memset(&ndr_desc, 0, sizeof(ndr_desc));
  		ndr_desc.res = p;
  		ndr_desc.attr_groups = e820_pmem_region_attribute_groups;
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  		ndr_desc.numa_node = e820_range_to_nid(p->start);
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  		set_bit(ND_REGION_PAGEMAP, &ndr_desc.flags);
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  		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
  ");
  	return -ENXIO;
  }
  
  static struct platform_driver e820_pmem_driver = {
  	.probe = e820_pmem_probe,
  	.remove = e820_pmem_remove,
  	.driver = {
  		.name = "e820_pmem",
  	},
  };
  
  static __init int e820_pmem_init(void)
  {
  	return platform_driver_register(&e820_pmem_driver);
  }
  
  static __exit void e820_pmem_exit(void)
  {
  	platform_driver_unregister(&e820_pmem_driver);
  }
  
  MODULE_ALIAS("platform:e820_pmem*");
  MODULE_LICENSE("GPL v2");
  MODULE_AUTHOR("Intel Corporation");
  module_init(e820_pmem_init);
  module_exit(e820_pmem_exit);