Merge tag 'devdax-for-5.1' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm...
[muen/linux.git] / drivers / nvdimm / e820.c
1 /*
2  * Copyright (c) 2015, Christoph Hellwig.
3  * Copyright (c) 2015, Intel Corporation.
4  */
5 #include <linux/platform_device.h>
6 #include <linux/memory_hotplug.h>
7 #include <linux/libnvdimm.h>
8 #include <linux/module.h>
9
10 static const struct attribute_group *e820_pmem_attribute_groups[] = {
11         &nvdimm_bus_attribute_group,
12         NULL,
13 };
14
15 static const struct attribute_group *e820_pmem_region_attribute_groups[] = {
16         &nd_region_attribute_group,
17         &nd_device_attribute_group,
18         NULL,
19 };
20
21 static int e820_pmem_remove(struct platform_device *pdev)
22 {
23         struct nvdimm_bus *nvdimm_bus = platform_get_drvdata(pdev);
24
25         nvdimm_bus_unregister(nvdimm_bus);
26         return 0;
27 }
28
29 #ifdef CONFIG_MEMORY_HOTPLUG
30 static int e820_range_to_nid(resource_size_t addr)
31 {
32         return memory_add_physaddr_to_nid(addr);
33 }
34 #else
35 static int e820_range_to_nid(resource_size_t addr)
36 {
37         return NUMA_NO_NODE;
38 }
39 #endif
40
41 static int e820_register_one(struct resource *res, void *data)
42 {
43         struct nd_region_desc ndr_desc;
44         struct nvdimm_bus *nvdimm_bus = data;
45
46         memset(&ndr_desc, 0, sizeof(ndr_desc));
47         ndr_desc.res = res;
48         ndr_desc.attr_groups = e820_pmem_region_attribute_groups;
49         ndr_desc.numa_node = e820_range_to_nid(res->start);
50         ndr_desc.target_node = ndr_desc.numa_node;
51         set_bit(ND_REGION_PAGEMAP, &ndr_desc.flags);
52         if (!nvdimm_pmem_region_create(nvdimm_bus, &ndr_desc))
53                 return -ENXIO;
54         return 0;
55 }
56
57 static int e820_pmem_probe(struct platform_device *pdev)
58 {
59         static struct nvdimm_bus_descriptor nd_desc;
60         struct device *dev = &pdev->dev;
61         struct nvdimm_bus *nvdimm_bus;
62         int rc = -ENXIO;
63
64         nd_desc.attr_groups = e820_pmem_attribute_groups;
65         nd_desc.provider_name = "e820";
66         nd_desc.module = THIS_MODULE;
67         nvdimm_bus = nvdimm_bus_register(dev, &nd_desc);
68         if (!nvdimm_bus)
69                 goto err;
70         platform_set_drvdata(pdev, nvdimm_bus);
71
72         rc = walk_iomem_res_desc(IORES_DESC_PERSISTENT_MEMORY_LEGACY,
73                         IORESOURCE_MEM, 0, -1, nvdimm_bus, e820_register_one);
74         if (rc)
75                 goto err;
76         return 0;
77 err:
78         nvdimm_bus_unregister(nvdimm_bus);
79         dev_err(dev, "failed to register legacy persistent memory ranges\n");
80         return rc;
81 }
82
83 static struct platform_driver e820_pmem_driver = {
84         .probe = e820_pmem_probe,
85         .remove = e820_pmem_remove,
86         .driver = {
87                 .name = "e820_pmem",
88         },
89 };
90
91 module_platform_driver(e820_pmem_driver);
92
93 MODULE_ALIAS("platform:e820_pmem*");
94 MODULE_LICENSE("GPL v2");
95 MODULE_AUTHOR("Intel Corporation");