91 lines
2.5 KiB
C
91 lines
2.5 KiB
C
/*
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* Copyright(c) 2016 Intel Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*/
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#include <linux/percpu-refcount.h>
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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 int dax_pmem_probe(struct device *dev)
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{
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struct resource res;
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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 nd_namespace_io *nsio;
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struct dax_region *dax_region;
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struct dev_pagemap pgmap = { 0 };
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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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ndns = nvdimm_namespace_common_probe(dev);
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if (IS_ERR(ndns))
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return PTR_ERR(ndns);
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nsio = to_nd_namespace_io(&ndns->dev);
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/* parse the 'pfn' info block via ->rw_bytes */
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rc = devm_nsio_enable(dev, nsio);
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if (rc)
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return rc;
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rc = nvdimm_setup_pfn(nd_pfn, &pgmap);
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if (rc)
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return rc;
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devm_nsio_disable(dev, nsio);
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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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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 -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 -EINVAL;
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/* adjust the dax_region resource to the start of data */
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memcpy(&res, &pgmap.res, sizeof(res));
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res.start += offset;
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dax_region = alloc_dax_region(dev, region_id, &res,
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le32_to_cpu(pfn_sb->align), PFN_DEV|PFN_MAP);
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if (!dax_region)
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return -ENOMEM;
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dev_dax = devm_create_dev_dax(dax_region, id, &pgmap);
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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 PTR_ERR_OR_ZERO(dev_dax);
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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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module_nd_driver(dax_pmem_driver);
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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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