3d88002e4a
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>
49 lines
1.5 KiB
C
49 lines
1.5 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 __LINUX_ND_H__
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#define __LINUX_ND_H__
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#include <linux/ndctl.h>
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#include <linux/device.h>
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struct nd_device_driver {
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struct device_driver drv;
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unsigned long type;
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int (*probe)(struct device *dev);
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int (*remove)(struct device *dev);
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};
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static inline struct nd_device_driver *to_nd_device_driver(
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struct device_driver *drv)
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{
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return container_of(drv, struct nd_device_driver, drv);
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};
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struct nd_namespace_io {
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struct device dev;
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struct resource res;
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};
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static inline struct nd_namespace_io *to_nd_namespace_io(struct device *dev)
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{
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return container_of(dev, struct nd_namespace_io, dev);
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}
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#define MODULE_ALIAS_ND_DEVICE(type) \
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MODULE_ALIAS("nd:t" __stringify(type) "*")
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#define ND_DEVICE_MODALIAS_FMT "nd:t%d"
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int __must_check __nd_driver_register(struct nd_device_driver *nd_drv,
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struct module *module, const char *mod_name);
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#define nd_driver_register(driver) \
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__nd_driver_register(driver, THIS_MODULE, KBUILD_MODNAME)
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#endif /* __LINUX_ND_H__ */
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