blob: b0045a505dc88c9ef56dcc1094a198bd011d24a7 [file] [log] [blame]
Dan Williams7a678322015-08-19 00:34:34 -04001/*
2 * Copyright (c) 2015, Christoph Hellwig.
3 * Copyright (c) 2015, Intel Corporation.
4 */
5#include <linux/platform_device.h>
Dan Williamsf7256dc2015-11-11 16:46:33 -08006#include <linux/memory_hotplug.h>
Dan Williams7a678322015-08-19 00:34:34 -04007#include <linux/libnvdimm.h>
8#include <linux/module.h>
9
10static const struct attribute_group *e820_pmem_attribute_groups[] = {
11 &nvdimm_bus_attribute_group,
12 NULL,
13};
14
15static const struct attribute_group *e820_pmem_region_attribute_groups[] = {
16 &nd_region_attribute_group,
17 &nd_device_attribute_group,
18 NULL,
19};
20
21static 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
Dan Williamsf7256dc2015-11-11 16:46:33 -080029#ifdef CONFIG_MEMORY_HOTPLUG
30static int e820_range_to_nid(resource_size_t addr)
31{
32 return memory_add_physaddr_to_nid(addr);
33}
34#else
35static int e820_range_to_nid(resource_size_t addr)
36{
37 return NUMA_NO_NODE;
38}
39#endif
40
Dan Williams7a678322015-08-19 00:34:34 -040041static 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
58 if (strncmp(p->name, "Persistent Memory (legacy)", 26) != 0)
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;
Dan Williamsf7256dc2015-11-11 16:46:33 -080064 ndr_desc.numa_node = e820_range_to_nid(p->start);
Dan Williams004f1af2015-08-24 19:20:23 -040065 set_bit(ND_REGION_PAGEMAP, &ndr_desc.flags);
Dan Williams7a678322015-08-19 00:34:34 -040066 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
78static 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
86static __init int e820_pmem_init(void)
87{
88 return platform_driver_register(&e820_pmem_driver);
89}
90
91static __exit void e820_pmem_exit(void)
92{
93 platform_driver_unregister(&e820_pmem_driver);
94}
95
96MODULE_ALIAS("platform:e820_pmem*");
97MODULE_LICENSE("GPL v2");
98MODULE_AUTHOR("Intel Corporation");
99module_init(e820_pmem_init);
100module_exit(e820_pmem_exit);