blob: ae0cb113a5d32e5ccaa025ff080b826d7cdfea94 [file] [log] [blame]
Dan Williams730926c2017-07-16 13:51:53 -07001// SPDX-License-Identifier: GPL-2.0
2/* Copyright(c) 2016 - 2018 Intel Corporation. All rights reserved. */
3#include <linux/memremap.h>
4#include <linux/module.h>
5#include <linux/pfn_t.h>
Dan Williams83762cb2021-11-15 13:20:57 -08006#include "../nvdimm/pfn.h"
7#include "../nvdimm/nd.h"
8#include "bus.h"
Dan Williams730926c2017-07-16 13:51:53 -07009
Dan Williams83762cb2021-11-15 13:20:57 -080010static struct dev_dax *__dax_pmem_probe(struct device *dev)
Dan Williams730926c2017-07-16 13:51:53 -070011{
Dan Williamsa4574f62020-10-13 16:50:29 -070012 struct range range;
Dan Williams730926c2017-07-16 13:51:53 -070013 int rc, id, region_id;
14 resource_size_t offset;
15 struct nd_pfn_sb *pfn_sb;
Dan Williams174ebec2020-10-13 16:49:38 -070016 struct dev_dax_data data;
Dan Williams730926c2017-07-16 13:51:53 -070017 struct nd_namespace_io *nsio;
18 struct dax_region *dax_region;
Christoph Hellwig1e240e82019-06-26 14:27:08 +020019 struct dev_pagemap pgmap = { };
Dan Williams730926c2017-07-16 13:51:53 -070020 struct nd_namespace_common *ndns;
21 struct nd_dax *nd_dax = to_nd_dax(dev);
22 struct nd_pfn *nd_pfn = &nd_dax->nd_pfn;
Dan Williams8fc5c732018-11-09 12:43:07 -080023 struct nd_region *nd_region = to_nd_region(dev->parent);
Dan Williams730926c2017-07-16 13:51:53 -070024
25 ndns = nvdimm_namespace_common_probe(dev);
26 if (IS_ERR(ndns))
27 return ERR_CAST(ndns);
Dan Williams730926c2017-07-16 13:51:53 -070028
29 /* parse the 'pfn' info block via ->rw_bytes */
Aneesh Kumar K.V8f4b01f2019-10-31 16:27:41 +053030 rc = devm_namespace_enable(dev, ndns, nd_info_block_reserve());
Dan Williams730926c2017-07-16 13:51:53 -070031 if (rc)
32 return ERR_PTR(rc);
33 rc = nvdimm_setup_pfn(nd_pfn, &pgmap);
34 if (rc)
35 return ERR_PTR(rc);
Aneesh Kumar K.V8f4b01f2019-10-31 16:27:41 +053036 devm_namespace_disable(dev, ndns);
Dan Williams730926c2017-07-16 13:51:53 -070037
38 /* reserve the metadata area, device-dax will reserve the data */
Vishal Vermad521fba2019-03-18 16:53:37 -060039 pfn_sb = nd_pfn->pfn_sb;
Dan Williams730926c2017-07-16 13:51:53 -070040 offset = le64_to_cpu(pfn_sb->dataoff);
Aneesh Kumar K.V8f4b01f2019-10-31 16:27:41 +053041 nsio = to_nd_namespace_io(&ndns->dev);
Dan Williams730926c2017-07-16 13:51:53 -070042 if (!devm_request_mem_region(dev, nsio->res.start, offset,
43 dev_name(&ndns->dev))) {
Vishal Vermad521fba2019-03-18 16:53:37 -060044 dev_warn(dev, "could not reserve metadata\n");
Dan Williams730926c2017-07-16 13:51:53 -070045 return ERR_PTR(-EBUSY);
Vishal Vermad521fba2019-03-18 16:53:37 -060046 }
Dan Williams730926c2017-07-16 13:51:53 -070047
48 rc = sscanf(dev_name(&ndns->dev), "namespace%d.%d", &region_id, &id);
49 if (rc != 2)
50 return ERR_PTR(-EINVAL);
51
Dan Williamsa4574f62020-10-13 16:50:29 -070052 /* adjust the dax_region range to the start of data */
53 range = pgmap.range;
Zheng Yongjun4e6a7b32020-12-14 21:45:06 +080054 range.start += offset;
Dan Williamsa4574f62020-10-13 16:50:29 -070055 dax_region = alloc_dax_region(dev, region_id, &range,
Dan Williamsc2f30112020-10-13 16:50:03 -070056 nd_region->target_node, le32_to_cpu(pfn_sb->align),
57 IORESOURCE_DAX_STATIC);
Dan Williams730926c2017-07-16 13:51:53 -070058 if (!dax_region)
59 return ERR_PTR(-ENOMEM);
60
Dan Williams174ebec2020-10-13 16:49:38 -070061 data = (struct dev_dax_data) {
62 .dax_region = dax_region,
63 .id = id,
64 .pgmap = &pgmap,
Dan Williamsa4574f62020-10-13 16:50:29 -070065 .size = range_len(&range),
Dan Williams174ebec2020-10-13 16:49:38 -070066 };
Dan Williams730926c2017-07-16 13:51:53 -070067
Dan Williams2532f412023-06-02 23:14:11 -070068 return devm_create_dev_dax(&data);
Dan Williams730926c2017-07-16 13:51:53 -070069}
Dan Williams83762cb2021-11-15 13:20:57 -080070
71static int dax_pmem_probe(struct device *dev)
72{
73 return PTR_ERR_OR_ZERO(__dax_pmem_probe(dev));
74}
75
76static struct nd_device_driver dax_pmem_driver = {
77 .probe = dax_pmem_probe,
78 .drv = {
79 .name = "dax_pmem",
80 },
81 .type = ND_DRIVER_DAX_PMEM,
82};
83
84static int __init dax_pmem_init(void)
85{
86 return nd_driver_register(&dax_pmem_driver);
87}
88module_init(dax_pmem_init);
89
90static void __exit dax_pmem_exit(void)
91{
92 driver_unregister(&dax_pmem_driver.drv);
93}
94module_exit(dax_pmem_exit);
Dan Williams730926c2017-07-16 13:51:53 -070095
96MODULE_LICENSE("GPL v2");
97MODULE_AUTHOR("Intel Corporation");
Dan Williams83762cb2021-11-15 13:20:57 -080098MODULE_ALIAS_ND_DEVICE(ND_DEVICE_DAX_PMEM);