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09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
7a67832c DW |
2 | /* |
3 | * Copyright (c) 2015, Christoph Hellwig. | |
4 | * Copyright (c) 2015, Intel Corporation. | |
5 | */ | |
6 | #include <linux/platform_device.h> | |
f7256dc0 | 7 | #include <linux/memory_hotplug.h> |
7a67832c DW |
8 | #include <linux/libnvdimm.h> |
9 | #include <linux/module.h> | |
10 | ||
11 | static const struct attribute_group *e820_pmem_attribute_groups[] = { | |
12 | &nvdimm_bus_attribute_group, | |
13 | NULL, | |
14 | }; | |
15 | ||
16 | static const struct attribute_group *e820_pmem_region_attribute_groups[] = { | |
17 | &nd_region_attribute_group, | |
18 | &nd_device_attribute_group, | |
19 | NULL, | |
20 | }; | |
21 | ||
22 | static int e820_pmem_remove(struct platform_device *pdev) | |
23 | { | |
24 | struct nvdimm_bus *nvdimm_bus = platform_get_drvdata(pdev); | |
25 | ||
26 | nvdimm_bus_unregister(nvdimm_bus); | |
27 | return 0; | |
28 | } | |
29 | ||
f7256dc0 DW |
30 | #ifdef CONFIG_MEMORY_HOTPLUG |
31 | static int e820_range_to_nid(resource_size_t addr) | |
32 | { | |
33 | return memory_add_physaddr_to_nid(addr); | |
34 | } | |
35 | #else | |
36 | static int e820_range_to_nid(resource_size_t addr) | |
37 | { | |
38 | return NUMA_NO_NODE; | |
39 | } | |
40 | #endif | |
41 | ||
d76401ad DW |
42 | static int e820_register_one(struct resource *res, void *data) |
43 | { | |
44 | struct nd_region_desc ndr_desc; | |
45 | struct nvdimm_bus *nvdimm_bus = data; | |
46 | ||
47 | memset(&ndr_desc, 0, sizeof(ndr_desc)); | |
48 | ndr_desc.res = res; | |
49 | ndr_desc.attr_groups = e820_pmem_region_attribute_groups; | |
50 | ndr_desc.numa_node = e820_range_to_nid(res->start); | |
8fc5c735 | 51 | ndr_desc.target_node = ndr_desc.numa_node; |
d76401ad DW |
52 | set_bit(ND_REGION_PAGEMAP, &ndr_desc.flags); |
53 | if (!nvdimm_pmem_region_create(nvdimm_bus, &ndr_desc)) | |
54 | return -ENXIO; | |
55 | return 0; | |
56 | } | |
57 | ||
7a67832c DW |
58 | static int e820_pmem_probe(struct platform_device *pdev) |
59 | { | |
60 | static struct nvdimm_bus_descriptor nd_desc; | |
61 | struct device *dev = &pdev->dev; | |
62 | struct nvdimm_bus *nvdimm_bus; | |
d76401ad | 63 | int rc = -ENXIO; |
7a67832c DW |
64 | |
65 | nd_desc.attr_groups = e820_pmem_attribute_groups; | |
66 | nd_desc.provider_name = "e820"; | |
bc9775d8 | 67 | nd_desc.module = THIS_MODULE; |
7a67832c DW |
68 | nvdimm_bus = nvdimm_bus_register(dev, &nd_desc); |
69 | if (!nvdimm_bus) | |
70 | goto err; | |
71 | platform_set_drvdata(pdev, nvdimm_bus); | |
72 | ||
d76401ad DW |
73 | rc = walk_iomem_res_desc(IORES_DESC_PERSISTENT_MEMORY_LEGACY, |
74 | IORESOURCE_MEM, 0, -1, nvdimm_bus, e820_register_one); | |
75 | if (rc) | |
76 | goto err; | |
7a67832c | 77 | return 0; |
d76401ad | 78 | err: |
7a67832c DW |
79 | nvdimm_bus_unregister(nvdimm_bus); |
80 | dev_err(dev, "failed to register legacy persistent memory ranges\n"); | |
d76401ad | 81 | return rc; |
7a67832c DW |
82 | } |
83 | ||
84 | static struct platform_driver e820_pmem_driver = { | |
85 | .probe = e820_pmem_probe, | |
86 | .remove = e820_pmem_remove, | |
87 | .driver = { | |
88 | .name = "e820_pmem", | |
89 | }, | |
90 | }; | |
91 | ||
3a71b3c8 | 92 | module_platform_driver(e820_pmem_driver); |
7a67832c DW |
93 | |
94 | MODULE_ALIAS("platform:e820_pmem*"); | |
95 | MODULE_LICENSE("GPL v2"); | |
96 | MODULE_AUTHOR("Intel Corporation"); |