42237e393f
Platforms like QEMU-KVM implement an NFIT table and label DSMs. However, since that environment does not define an aliased configuration, the labels are currently ignored and the kernel registers a single full-sized pmem-namespace per region. Now that the kernel supports sub-divisions of pmem regions the labels have a purpose. Arrange for the labels to be honored when we find an existing / valid namespace index block. Cc: <qemu-devel@nongnu.org> Cc: Haozhong Zhang <haozhong.zhang@intel.com> Cc: Xiao Guangrong <guangrong.xiao@linux.intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
115 lines
2.4 KiB
C
115 lines
2.4 KiB
C
/*
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* Copyright(c) 2013-2015 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/vmalloc.h>
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/sizes.h>
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#include <linux/ndctl.h>
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#include <linux/slab.h>
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#include <linux/mm.h>
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#include <linux/nd.h>
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#include "label.h"
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#include "nd.h"
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static int nvdimm_probe(struct device *dev)
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{
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struct nvdimm_drvdata *ndd;
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int rc;
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rc = nvdimm_check_config_data(dev);
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if (rc) {
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/* not required for non-aliased nvdimm, ex. NVDIMM-N */
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if (rc == -ENOTTY)
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rc = 0;
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return rc;
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}
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ndd = kzalloc(sizeof(*ndd), GFP_KERNEL);
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if (!ndd)
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return -ENOMEM;
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dev_set_drvdata(dev, ndd);
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ndd->dpa.name = dev_name(dev);
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ndd->ns_current = -1;
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ndd->ns_next = -1;
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ndd->dpa.start = 0;
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ndd->dpa.end = -1;
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ndd->dev = dev;
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get_device(dev);
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kref_init(&ndd->kref);
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rc = nvdimm_init_nsarea(ndd);
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if (rc)
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goto err;
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rc = nvdimm_init_config_data(ndd);
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if (rc)
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goto err;
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dev_dbg(dev, "config data size: %d\n", ndd->nsarea.config_size);
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nvdimm_bus_lock(dev);
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ndd->ns_current = nd_label_validate(ndd);
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ndd->ns_next = nd_label_next_nsindex(ndd->ns_current);
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nd_label_copy(ndd, to_next_namespace_index(ndd),
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to_current_namespace_index(ndd));
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rc = nd_label_reserve_dpa(ndd);
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if (ndd->ns_current >= 0)
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nvdimm_set_aliasing(dev);
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nvdimm_bus_unlock(dev);
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if (rc)
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goto err;
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return 0;
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err:
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put_ndd(ndd);
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return rc;
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}
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static int nvdimm_remove(struct device *dev)
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{
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struct nvdimm_drvdata *ndd = dev_get_drvdata(dev);
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if (!ndd)
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return 0;
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nvdimm_bus_lock(dev);
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dev_set_drvdata(dev, NULL);
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nvdimm_bus_unlock(dev);
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put_ndd(ndd);
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return 0;
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}
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static struct nd_device_driver nvdimm_driver = {
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.probe = nvdimm_probe,
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.remove = nvdimm_remove,
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.drv = {
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.name = "nvdimm",
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},
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.type = ND_DRIVER_DIMM,
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};
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int __init nvdimm_init(void)
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{
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return nd_driver_register(&nvdimm_driver);
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}
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void nvdimm_exit(void)
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{
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driver_unregister(&nvdimm_driver.drv);
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}
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MODULE_ALIAS_ND_DEVICE(ND_DEVICE_DIMM);
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