// SPDX-License-Identifier: GPL-2.0 /* Copyright(c) 2016 - 2018 Intel Corporation. All rights reserved. */ #include <linux/memremap.h> #include <linux/module.h> #include <linux/pfn_t.h> #include "../../nvdimm/pfn.h" #include "../../nvdimm/nd.h" #include "../bus.h" struct dev_dax *__dax_pmem_probe(struct device *dev, enum dev_dax_subsys subsys) { struct range range; int rc, id, region_id; resource_size_t offset; struct nd_pfn_sb *pfn_sb; struct dev_dax *dev_dax; struct dev_dax_data data; struct nd_namespace_io *nsio; struct dax_region *dax_region; struct dev_pagemap pgmap = { }; struct nd_namespace_common *ndns; struct nd_dax *nd_dax = to_nd_dax(dev); struct nd_pfn *nd_pfn = &nd_dax->nd_pfn; struct nd_region *nd_region = to_nd_region(dev->parent); ndns = nvdimm_namespace_common_probe(dev); if (IS_ERR(ndns)) return ERR_CAST(ndns); /* parse the 'pfn' info block via ->rw_bytes */ rc = devm_namespace_enable(dev, ndns, nd_info_block_reserve()); if (rc) return ERR_PTR(rc); rc = nvdimm_setup_pfn(nd_pfn, &pgmap); if (rc) return ERR_PTR(rc); devm_namespace_disable(dev, ndns); /* reserve the metadata area, device-dax will reserve the data */ pfn_sb = nd_pfn->pfn_sb; offset = le64_to_cpu(pfn_sb->dataoff); nsio = to_nd_namespace_io(&ndns->dev); if (!devm_request_mem_region(dev, nsio->res.start, offset, dev_name(&ndns->dev))) { dev_warn(dev, "could not reserve metadata\n"); return ERR_PTR(-EBUSY); } rc = sscanf(dev_name(&ndns->dev), "namespace%d.%d", ®ion_id, &id); if (rc != 2) return ERR_PTR(-EINVAL); /* adjust the dax_region range to the start of data */ range = pgmap.range; range.start += offset, dax_region = alloc_dax_region(dev, region_id, &range, nd_region->target_node, le32_to_cpu(pfn_sb->align), IORESOURCE_DAX_STATIC); if (!dax_region) return ERR_PTR(-ENOMEM); data = (struct dev_dax_data) { .dax_region = dax_region, .id = id, .pgmap = &pgmap, .subsys = subsys, .size = range_len(&range), }; dev_dax = devm_create_dev_dax(&data); /* child dev_dax instances now own the lifetime of the dax_region */ dax_region_put(dax_region); return dev_dax; } EXPORT_SYMBOL_GPL(__dax_pmem_probe); MODULE_LICENSE("GPL v2"); MODULE_AUTHOR("Intel Corporation");