1// SPDX-License-Identifier: GPL-2.0
 2/* Copyright(c) 2016 - 2018 Intel Corporation. All rights reserved. */
 3#ifndef __DAX_BUS_H__
 4#define __DAX_BUS_H__
 5#include <linux/device.h>
 6
 7struct dev_dax;
 8struct resource;
 9struct dax_device;
10struct dax_region;
11void dax_region_put(struct dax_region *dax_region);
12struct dax_region *alloc_dax_region(struct device *parent, int region_id,
13		struct resource *res, int target_node, unsigned int align,
14		unsigned long flags);
15
16enum dev_dax_subsys {
17	DEV_DAX_BUS,
18	DEV_DAX_CLASS,
19};
20
21struct dev_dax *__devm_create_dev_dax(struct dax_region *dax_region, int id,
22		struct dev_pagemap *pgmap, enum dev_dax_subsys subsys);
23
24static inline struct dev_dax *devm_create_dev_dax(struct dax_region *dax_region,
25		int id, struct dev_pagemap *pgmap)
26{
27	return __devm_create_dev_dax(dax_region, id, pgmap, DEV_DAX_BUS);
28}
29
30/* to be deleted when DEV_DAX_CLASS is removed */
31struct dev_dax *__dax_pmem_probe(struct device *dev, enum dev_dax_subsys subsys);
32
33struct dax_device_driver {
34	struct device_driver drv;
35	struct list_head ids;
36	int match_always;
37};
38
39int __dax_driver_register(struct dax_device_driver *dax_drv,
40		struct module *module, const char *mod_name);
41#define dax_driver_register(driver) \
42	__dax_driver_register(driver, THIS_MODULE, KBUILD_MODNAME)
43void dax_driver_unregister(struct dax_device_driver *dax_drv);
44void kill_dev_dax(struct dev_dax *dev_dax);
45
46#if IS_ENABLED(CONFIG_DEV_DAX_PMEM_COMPAT)
47int dev_dax_probe(struct device *dev);
48#endif
49
50/*
51 * While run_dax() is potentially a generic operation that could be
52 * defined in include/linux/dax.h we don't want to grow any users
53 * outside of drivers/dax/
54 */
55void run_dax(struct dax_device *dax_dev);
56
57#define MODULE_ALIAS_DAX_DEVICE(type) \
58	MODULE_ALIAS("dax:t" __stringify(type) "*")
59#define DAX_DEVICE_MODALIAS_FMT "dax:t%d"
60
61#endif /* __DAX_BUS_H__ */