| // 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 resource res; |
| int rc, id, region_id; |
| resource_size_t offset; |
| struct nd_pfn_sb *pfn_sb; |
| struct dev_dax *dev_dax; |
| struct nd_namespace_io *nsio; |
| struct dax_region *dax_region; |
| struct dev_pagemap pgmap = { 0 }; |
| 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); |
| nsio = to_nd_namespace_io(&ndns->dev); |
| |
| /* parse the 'pfn' info block via ->rw_bytes */ |
| rc = devm_nsio_enable(dev, nsio); |
| if (rc) |
| return ERR_PTR(rc); |
| rc = nvdimm_setup_pfn(nd_pfn, &pgmap); |
| if (rc) |
| return ERR_PTR(rc); |
| devm_nsio_disable(dev, nsio); |
| |
| /* reserve the metadata area, device-dax will reserve the data */ |
| pfn_sb = nd_pfn->pfn_sb; |
| offset = le64_to_cpu(pfn_sb->dataoff); |
| 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 resource to the start of data */ |
| memcpy(&res, &pgmap.res, sizeof(res)); |
| res.start += offset; |
| dax_region = alloc_dax_region(dev, region_id, &res, |
| nd_region->target_node, le32_to_cpu(pfn_sb->align), |
| PFN_DEV|PFN_MAP); |
| if (!dax_region) |
| return ERR_PTR(-ENOMEM); |
| |
| dev_dax = __devm_create_dev_dax(dax_region, id, &pgmap, subsys); |
| |
| /* 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"); |