These changes are the raw update to linux-4.4.6-rt14. Kernel sources

[kvmfornfv.git] / kernel / drivers / nvdimm / e820.c

diff --git a/kernel/drivers/nvdimm/e820.c b/kernel/drivers/nvdimm/e820.c
new file mode 100644 (file)
index 0000000..b0045a5
--- /dev/null
+++ b/kernel/drivers/nvdimm/e820.c
@@ -0,0 +1,100 @@
+/*
+ * Copyright (c) 2015, Christoph Hellwig.
+ * Copyright (c) 2015, Intel Corporation.
+ */
+#include <linux/platform_device.h>
+#include <linux/memory_hotplug.h>
+#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;
+}
+
+#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
+
+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";
+       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;
+
+               if (strncmp(p->name, "Persistent Memory (legacy)", 26) != 0)
+                       continue;
+
+               memset(&ndr_desc, 0, sizeof(ndr_desc));
+               ndr_desc.res = p;
+               ndr_desc.attr_groups = e820_pmem_region_attribute_groups;
+               ndr_desc.numa_node = e820_range_to_nid(p->start);
+               set_bit(ND_REGION_PAGEMAP, &ndr_desc.flags);
+               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\n");
+       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);