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The libnvdimm region driver is an intermediary driver that translates non-volatile "region"s into "namespace" sub-devices that are surfaced by persistent memory block-device drivers (PMEM and BLK). ACPI 6 introduces the concept that a given nvdimm may simultaneously offer multiple access modes to its media through direct PMEM load/store access, or windowed BLK mode. Existing nvdimms mostly implement a PMEM interface, some offer a BLK-like mode, but never both as ACPI 6 defines. If an nvdimm is single interfaced, then there is no need for dimm metadata labels. For these devices we can take the region boundaries directly to create a child namespace device (nd_namespace_io). Acked-by: Christoph Hellwig <hch@lst.de> Tested-by: Toshi Kani <toshi.kani@hp.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
60 lines
1.7 KiB
C
60 lines
1.7 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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#ifndef __ND_H__
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#define __ND_H__
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#include <linux/libnvdimm.h>
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#include <linux/device.h>
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#include <linux/mutex.h>
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#include <linux/ndctl.h>
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struct nvdimm_drvdata {
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struct device *dev;
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struct nd_cmd_get_config_size nsarea;
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void *data;
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};
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struct nd_region_namespaces {
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int count;
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int active;
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};
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struct nd_region {
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struct device dev;
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u16 ndr_mappings;
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u64 ndr_size;
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u64 ndr_start;
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int id;
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void *provider_data;
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struct nd_mapping mapping[0];
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};
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enum nd_async_mode {
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ND_SYNC,
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ND_ASYNC,
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};
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void nd_device_register(struct device *dev);
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void nd_device_unregister(struct device *dev, enum nd_async_mode mode);
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int __init nvdimm_init(void);
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int __init nd_region_init(void);
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void nvdimm_exit(void);
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void nd_region_exit(void);
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int nvdimm_init_nsarea(struct nvdimm_drvdata *ndd);
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int nvdimm_init_config_data(struct nvdimm_drvdata *ndd);
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struct nd_region *to_nd_region(struct device *dev);
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int nd_region_to_nstype(struct nd_region *nd_region);
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int nd_region_register_namespaces(struct nd_region *nd_region, int *err);
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void nvdimm_bus_lock(struct device *dev);
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void nvdimm_bus_unlock(struct device *dev);
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bool is_nvdimm_bus_locked(struct device *dev);
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#endif /* __ND_H__ */
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