Commit | Line | Data |
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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 | ||
d76401ad DW |
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 | set_bit(ND_REGION_PAGEMAP, &ndr_desc.flags); | |
51 | if (!nvdimm_pmem_region_create(nvdimm_bus, &ndr_desc)) | |
52 | return -ENXIO; | |
53 | return 0; | |
54 | } | |
55 | ||
7a67832c DW |
56 | static int e820_pmem_probe(struct platform_device *pdev) |
57 | { | |
58 | static struct nvdimm_bus_descriptor nd_desc; | |
59 | struct device *dev = &pdev->dev; | |
60 | struct nvdimm_bus *nvdimm_bus; | |
d76401ad | 61 | int rc = -ENXIO; |
7a67832c DW |
62 | |
63 | nd_desc.attr_groups = e820_pmem_attribute_groups; | |
64 | nd_desc.provider_name = "e820"; | |
bc9775d8 | 65 | nd_desc.module = THIS_MODULE; |
7a67832c DW |
66 | nvdimm_bus = nvdimm_bus_register(dev, &nd_desc); |
67 | if (!nvdimm_bus) | |
68 | goto err; | |
69 | platform_set_drvdata(pdev, nvdimm_bus); | |
70 | ||
d76401ad DW |
71 | rc = walk_iomem_res_desc(IORES_DESC_PERSISTENT_MEMORY_LEGACY, |
72 | IORESOURCE_MEM, 0, -1, nvdimm_bus, e820_register_one); | |
73 | if (rc) | |
74 | goto err; | |
7a67832c | 75 | return 0; |
d76401ad | 76 | err: |
7a67832c DW |
77 | nvdimm_bus_unregister(nvdimm_bus); |
78 | dev_err(dev, "failed to register legacy persistent memory ranges\n"); | |
d76401ad | 79 | return rc; |
7a67832c DW |
80 | } |
81 | ||
82 | static struct platform_driver e820_pmem_driver = { | |
83 | .probe = e820_pmem_probe, | |
84 | .remove = e820_pmem_remove, | |
85 | .driver = { | |
86 | .name = "e820_pmem", | |
87 | }, | |
88 | }; | |
89 | ||
3a71b3c8 | 90 | module_platform_driver(e820_pmem_driver); |
7a67832c DW |
91 | |
92 | MODULE_ALIAS("platform:e820_pmem*"); | |
93 | MODULE_LICENSE("GPL v2"); | |
94 | MODULE_AUTHOR("Intel Corporation"); |