Commit | Line | Data |
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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> | |
7b27a862 | 10 | #include <linux/numa.h> |
7a67832c | 11 | |
7a67832c DW |
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 | ||
d76401ad DW |
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; | |
7b27a862 | 24 | int nid = phys_to_target_node(res->start); |
d76401ad DW |
25 | |
26 | memset(&ndr_desc, 0, sizeof(ndr_desc)); | |
27 | ndr_desc.res = res; | |
7b27a862 DW |
28 | ndr_desc.numa_node = numa_map_to_online_node(nid); |
29 | ndr_desc.target_node = nid; | |
d76401ad DW |
30 | set_bit(ND_REGION_PAGEMAP, &ndr_desc.flags); |
31 | if (!nvdimm_pmem_region_create(nvdimm_bus, &ndr_desc)) | |
32 | return -ENXIO; | |
33 | return 0; | |
34 | } | |
35 | ||
7a67832c DW |
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; | |
d76401ad | 41 | int rc = -ENXIO; |
7a67832c | 42 | |
7a67832c | 43 | nd_desc.provider_name = "e820"; |
bc9775d8 | 44 | nd_desc.module = THIS_MODULE; |
7a67832c DW |
45 | nvdimm_bus = nvdimm_bus_register(dev, &nd_desc); |
46 | if (!nvdimm_bus) | |
47 | goto err; | |
48 | platform_set_drvdata(pdev, nvdimm_bus); | |
49 | ||
d76401ad DW |
50 | rc = walk_iomem_res_desc(IORES_DESC_PERSISTENT_MEMORY_LEGACY, |
51 | IORESOURCE_MEM, 0, -1, nvdimm_bus, e820_register_one); | |
52 | if (rc) | |
53 | goto err; | |
7a67832c | 54 | return 0; |
d76401ad | 55 | err: |
7a67832c DW |
56 | nvdimm_bus_unregister(nvdimm_bus); |
57 | dev_err(dev, "failed to register legacy persistent memory ranges\n"); | |
d76401ad | 58 | return rc; |
7a67832c DW |
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 | ||
3a71b3c8 | 69 | module_platform_driver(e820_pmem_driver); |
7a67832c DW |
70 | |
71 | MODULE_ALIAS("platform:e820_pmem*"); | |
72 | MODULE_LICENSE("GPL v2"); | |
73 | MODULE_AUTHOR("Intel Corporation"); |