1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * Copyright (c) 2015, Christoph Hellwig. |
4 | * Copyright (c) 2015, Intel Corporation. |
5 | */ |
6 | #include <linux/platform_device.h> |
7 | #include <linux/memory_hotplug.h> |
8 | #include <linux/libnvdimm.h> |
9 | #include <linux/module.h> |
10 | #include <linux/numa.h> |
11 | |
12 | static int e820_pmem_remove(struct platform_device *pdev) |
13 | { |
14 | struct nvdimm_bus *nvdimm_bus = platform_get_drvdata(pdev); |
15 | |
16 | nvdimm_bus_unregister(nvdimm_bus); |
17 | return 0; |
18 | } |
19 | |
20 | static int e820_register_one(struct resource *res, void *data) |
21 | { |
22 | struct nd_region_desc ndr_desc; |
23 | struct nvdimm_bus *nvdimm_bus = data; |
24 | int nid = phys_to_target_node(start: res->start); |
25 | |
26 | memset(&ndr_desc, 0, sizeof(ndr_desc)); |
27 | ndr_desc.res = res; |
28 | ndr_desc.numa_node = numa_map_to_online_node(nid); |
29 | ndr_desc.target_node = nid; |
30 | set_bit(nr: ND_REGION_PAGEMAP, addr: &ndr_desc.flags); |
31 | if (!nvdimm_pmem_region_create(nvdimm_bus, ndr_desc: &ndr_desc)) |
32 | return -ENXIO; |
33 | return 0; |
34 | } |
35 | |
36 | static int e820_pmem_probe(struct platform_device *pdev) |
37 | { |
38 | static struct nvdimm_bus_descriptor nd_desc; |
39 | struct device *dev = &pdev->dev; |
40 | struct nvdimm_bus *nvdimm_bus; |
41 | int rc = -ENXIO; |
42 | |
43 | nd_desc.provider_name = "e820" ; |
44 | nd_desc.module = THIS_MODULE; |
45 | nvdimm_bus = nvdimm_bus_register(parent: dev, nfit_desc: &nd_desc); |
46 | if (!nvdimm_bus) |
47 | goto err; |
48 | platform_set_drvdata(pdev, data: nvdimm_bus); |
49 | |
50 | rc = walk_iomem_res_desc(desc: IORES_DESC_PERSISTENT_MEMORY_LEGACY, |
51 | IORESOURCE_MEM, start: 0, end: -1, arg: nvdimm_bus, func: e820_register_one); |
52 | if (rc) |
53 | goto err; |
54 | return 0; |
55 | err: |
56 | nvdimm_bus_unregister(nvdimm_bus); |
57 | dev_err(dev, "failed to register legacy persistent memory ranges\n" ); |
58 | return rc; |
59 | } |
60 | |
61 | static struct platform_driver e820_pmem_driver = { |
62 | .probe = e820_pmem_probe, |
63 | .remove = e820_pmem_remove, |
64 | .driver = { |
65 | .name = "e820_pmem" , |
66 | }, |
67 | }; |
68 | |
69 | module_platform_driver(e820_pmem_driver); |
70 | |
71 | MODULE_ALIAS("platform:e820_pmem*" ); |
72 | MODULE_LICENSE("GPL v2" ); |
73 | MODULE_AUTHOR("Intel Corporation" ); |
74 | |