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