104 lines
2.6 KiB
C
104 lines
2.6 KiB
C
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// 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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