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730926c3b0
On the expectation that some environments may not upgrade libdaxctl (userspace component that depends on the /sys/class/dax hierarchy), provide a default / legacy dax_pmem_compat driver. The dax_pmem_compat driver implements the original /sys/class/dax sysfs layout rather than /sys/bus/dax. When userspace is upgraded it can blacklist this module and switch to the dax_pmem driver going forward. CONFIG_DEV_DAX_PMEM_COMPAT and supporting code will be deleted according to the dax_pmem entry in Documentation/ABI/obsolete/. Signed-off-by: Dan Williams <dan.j.williams@intel.com>
61 lines
1.8 KiB
C
61 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright(c) 2016 - 2018 Intel Corporation. All rights reserved. */
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#ifndef __DAX_BUS_H__
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#define __DAX_BUS_H__
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#include <linux/device.h>
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struct dev_dax;
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struct resource;
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struct dax_device;
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struct dax_region;
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void dax_region_put(struct dax_region *dax_region);
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struct dax_region *alloc_dax_region(struct device *parent, int region_id,
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struct resource *res, unsigned int align, unsigned long flags);
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enum dev_dax_subsys {
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DEV_DAX_BUS,
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DEV_DAX_CLASS,
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};
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struct dev_dax *__devm_create_dev_dax(struct dax_region *dax_region, int id,
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struct dev_pagemap *pgmap, enum dev_dax_subsys subsys);
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static inline struct dev_dax *devm_create_dev_dax(struct dax_region *dax_region,
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int id, struct dev_pagemap *pgmap)
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{
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return __devm_create_dev_dax(dax_region, id, pgmap, DEV_DAX_BUS);
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}
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/* to be deleted when DEV_DAX_CLASS is removed */
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struct dev_dax *__dax_pmem_probe(struct device *dev, enum dev_dax_subsys subsys);
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struct dax_device_driver {
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struct device_driver drv;
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struct list_head ids;
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int match_always;
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};
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int __dax_driver_register(struct dax_device_driver *dax_drv,
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struct module *module, const char *mod_name);
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#define dax_driver_register(driver) \
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__dax_driver_register(driver, THIS_MODULE, KBUILD_MODNAME)
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void dax_driver_unregister(struct dax_device_driver *dax_drv);
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void kill_dev_dax(struct dev_dax *dev_dax);
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#if IS_ENABLED(CONFIG_DEV_DAX_PMEM_COMPAT)
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int dev_dax_probe(struct device *dev);
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#endif
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/*
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* While run_dax() is potentially a generic operation that could be
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* defined in include/linux/dax.h we don't want to grow any users
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* outside of drivers/dax/
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*/
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void run_dax(struct dax_device *dax_dev);
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#define MODULE_ALIAS_DAX_DEVICE(type) \
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MODULE_ALIAS("dax:t" __stringify(type) "*")
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#define DAX_DEVICE_MODALIAS_FMT "dax:t%d"
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#endif /* __DAX_BUS_H__ */
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