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7a67832c DW |
1 | /* |
2 | * Copyright (c) 2015, Christoph Hellwig. | |
3 | * Copyright (c) 2015, Intel Corporation. | |
4 | */ | |
5 | #include <linux/platform_device.h> | |
f7256dc0 | 6 | #include <linux/memory_hotplug.h> |
7a67832c DW |
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 | ||
f7256dc0 DW |
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 | ||
7a67832c DW |
41 | static int e820_pmem_probe(struct platform_device *pdev) |
42 | { | |
43 | static struct nvdimm_bus_descriptor nd_desc; | |
44 | struct device *dev = &pdev->dev; | |
45 | struct nvdimm_bus *nvdimm_bus; | |
46 | struct resource *p; | |
47 | ||
48 | nd_desc.attr_groups = e820_pmem_attribute_groups; | |
49 | nd_desc.provider_name = "e820"; | |
50 | nvdimm_bus = nvdimm_bus_register(dev, &nd_desc); | |
51 | if (!nvdimm_bus) | |
52 | goto err; | |
53 | platform_set_drvdata(pdev, nvdimm_bus); | |
54 | ||
55 | for (p = iomem_resource.child; p ; p = p->sibling) { | |
56 | struct nd_region_desc ndr_desc; | |
57 | ||
f0f4711a | 58 | if (p->desc != IORES_DESC_PERSISTENT_MEMORY_LEGACY) |
7a67832c DW |
59 | continue; |
60 | ||
61 | memset(&ndr_desc, 0, sizeof(ndr_desc)); | |
62 | ndr_desc.res = p; | |
63 | ndr_desc.attr_groups = e820_pmem_region_attribute_groups; | |
f7256dc0 | 64 | ndr_desc.numa_node = e820_range_to_nid(p->start); |
004f1afb | 65 | set_bit(ND_REGION_PAGEMAP, &ndr_desc.flags); |
7a67832c DW |
66 | if (!nvdimm_pmem_region_create(nvdimm_bus, &ndr_desc)) |
67 | goto err; | |
68 | } | |
69 | ||
70 | return 0; | |
71 | ||
72 | err: | |
73 | nvdimm_bus_unregister(nvdimm_bus); | |
74 | dev_err(dev, "failed to register legacy persistent memory ranges\n"); | |
75 | return -ENXIO; | |
76 | } | |
77 | ||
78 | static struct platform_driver e820_pmem_driver = { | |
79 | .probe = e820_pmem_probe, | |
80 | .remove = e820_pmem_remove, | |
81 | .driver = { | |
82 | .name = "e820_pmem", | |
83 | }, | |
84 | }; | |
85 | ||
86 | static __init int e820_pmem_init(void) | |
87 | { | |
88 | return platform_driver_register(&e820_pmem_driver); | |
89 | } | |
90 | ||
91 | static __exit void e820_pmem_exit(void) | |
92 | { | |
93 | platform_driver_unregister(&e820_pmem_driver); | |
94 | } | |
95 | ||
96 | MODULE_ALIAS("platform:e820_pmem*"); | |
97 | MODULE_LICENSE("GPL v2"); | |
98 | MODULE_AUTHOR("Intel Corporation"); | |
99 | module_init(e820_pmem_init); | |
100 | module_exit(e820_pmem_exit); |