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1// SPDX-License-Identifier: GPL-2.02/* 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>6#include "../nvdimm/pfn.h"7#include "../nvdimm/nd.h"8#include "bus.h"9 10static struct dev_dax *__dax_pmem_probe(struct device *dev)11{12 struct range range;13 int rc, id, region_id;14 resource_size_t offset;15 struct nd_pfn_sb *pfn_sb;16 struct dev_dax_data data;17 struct nd_namespace_io *nsio;18 struct dax_region *dax_region;19 struct dev_pagemap pgmap = { };20 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;23 struct nd_region *nd_region = to_nd_region(dev->parent);24 25 ndns = nvdimm_namespace_common_probe(dev);26 if (IS_ERR(ndns))27 return ERR_CAST(ndns);28 29 /* parse the 'pfn' info block via ->rw_bytes */30 rc = devm_namespace_enable(dev, ndns, nd_info_block_reserve());31 if (rc)32 return ERR_PTR(rc);33 rc = nvdimm_setup_pfn(nd_pfn, &pgmap);34 if (rc)35 return ERR_PTR(rc);36 devm_namespace_disable(dev, ndns);37 38 /* reserve the metadata area, device-dax will reserve the data */39 pfn_sb = nd_pfn->pfn_sb;40 offset = le64_to_cpu(pfn_sb->dataoff);41 nsio = to_nd_namespace_io(&ndns->dev);42 if (!devm_request_mem_region(dev, nsio->res.start, offset,43 dev_name(&ndns->dev))) {44 dev_warn(dev, "could not reserve metadata\n");45 return ERR_PTR(-EBUSY);46 }47 48 rc = sscanf(dev_name(&ndns->dev), "namespace%d.%d", ®ion_id, &id);49 if (rc != 2)50 return ERR_PTR(-EINVAL);51 52 /* adjust the dax_region range to the start of data */53 range = pgmap.range;54 range.start += offset;55 dax_region = alloc_dax_region(dev, region_id, &range,56 nd_region->target_node, le32_to_cpu(pfn_sb->align),57 IORESOURCE_DAX_STATIC);58 if (!dax_region)59 return ERR_PTR(-ENOMEM);60 61 data = (struct dev_dax_data) {62 .dax_region = dax_region,63 .id = id,64 .pgmap = &pgmap,65 .size = range_len(&range),66 .memmap_on_memory = false,67 };68 69 return devm_create_dev_dax(&data);70}71 72static int dax_pmem_probe(struct device *dev)73{74 return PTR_ERR_OR_ZERO(__dax_pmem_probe(dev));75}76 77static struct nd_device_driver dax_pmem_driver = {78 .probe = dax_pmem_probe,79 .drv = {80 .name = "dax_pmem",81 },82 .type = ND_DRIVER_DAX_PMEM,83};84 85static int __init dax_pmem_init(void)86{87 return nd_driver_register(&dax_pmem_driver);88}89module_init(dax_pmem_init);90 91static void __exit dax_pmem_exit(void)92{93 driver_unregister(&dax_pmem_driver.drv);94}95module_exit(dax_pmem_exit);96 97MODULE_DESCRIPTION("PMEM DAX: direct access to persistent memory");98MODULE_LICENSE("GPL v2");99MODULE_AUTHOR("Intel Corporation");100MODULE_ALIAS_ND_DEVICE(ND_DEVICE_DAX_PMEM);101