projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 | |
| 52155827 | 12 | static void e820_pmem_remove(struct platform_device *pdev) |
| 7a67832c DW |
13 | { |
| 14 | struct nvdimm_bus *nvdimm_bus = platform_get_drvdata(pdev); | |
| 15 | ||
| 16 | nvdimm_bus_unregister(nvdimm_bus); | |
| 7a67832c DW |
17 | } |
| 18 | ||
| d76401ad DW |
19 | static int e820_register_one(struct resource *res, void *data) |
| 20 | { | |
| 21 | struct nd_region_desc ndr_desc; | |
| 22 | struct nvdimm_bus *nvdimm_bus = data; | |
| 7b27a862 | 23 | int nid = phys_to_target_node(res->start); |
| d76401ad DW |
24 | |
| 25 | memset(&ndr_desc, 0, sizeof(ndr_desc)); | |
| 26 | ndr_desc.res = res; | |
| 7b27a862 DW |
27 | ndr_desc.numa_node = numa_map_to_online_node(nid); |
| 28 | ndr_desc.target_node = nid; | |
| d76401ad DW |
29 | set_bit(ND_REGION_PAGEMAP, &ndr_desc.flags); |
| 30 | if (!nvdimm_pmem_region_create(nvdimm_bus, &ndr_desc)) | |
| 31 | return -ENXIO; | |
| 32 | return 0; | |
| 33 | } | |
| 34 | ||
| 7a67832c DW |
35 | static int e820_pmem_probe(struct platform_device *pdev) |
| 36 | { | |
| 37 | static struct nvdimm_bus_descriptor nd_desc; | |
| 38 | struct device *dev = &pdev->dev; | |
| 39 | struct nvdimm_bus *nvdimm_bus; | |
| d76401ad | 40 | int rc = -ENXIO; |
| 7a67832c | 41 | |
| 7a67832c | 42 | nd_desc.provider_name = "e820"; |
| bc9775d8 | 43 | nd_desc.module = THIS_MODULE; |
| 7a67832c DW |
44 | nvdimm_bus = nvdimm_bus_register(dev, &nd_desc); |
| 45 | if (!nvdimm_bus) | |
| 46 | goto err; | |
| 47 | platform_set_drvdata(pdev, nvdimm_bus); | |
| 48 | ||
| d76401ad DW |
49 | rc = walk_iomem_res_desc(IORES_DESC_PERSISTENT_MEMORY_LEGACY, |
| 50 | IORESOURCE_MEM, 0, -1, nvdimm_bus, e820_register_one); | |
| 51 | if (rc) | |
| 52 | goto err; | |
| 7a67832c | 53 | return 0; |
| d76401ad | 54 | err: |
| 7a67832c DW |
55 | nvdimm_bus_unregister(nvdimm_bus); |
| 56 | dev_err(dev, "failed to register legacy persistent memory ranges\n"); | |
| d76401ad | 57 | return rc; |
| 7a67832c DW |
58 | } |
| 59 | ||
| 60 | static struct platform_driver e820_pmem_driver = { | |
| 61 | .probe = e820_pmem_probe, | |
| 52155827 | 62 | .remove_new = e820_pmem_remove, |
| 7a67832c DW |
63 | .driver = { |
| 64 | .name = "e820_pmem", | |
| 65 | }, | |
| 66 | }; | |
| 67 | ||
| 3a71b3c8 | 68 | module_platform_driver(e820_pmem_driver); |
| 7a67832c DW |
69 | |
| 70 | MODULE_ALIAS("platform:e820_pmem*"); | |
| 5b2480fe | 71 | MODULE_DESCRIPTION("NVDIMM support for e820 type-12 memory"); |
| 7a67832c DW |
72 | MODULE_LICENSE("GPL v2"); |
| 73 | MODULE_AUTHOR("Intel Corporation"); |