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#include <linux/range.h>
 7
 8struct dev_dax;
 9struct resource;
10struct dax_device;
11struct dax_region;
12void dax_region_put(struct dax_region *dax_region);
13
14#define IORESOURCE_DAX_STATIC (1UL << 0)
15struct dax_region *alloc_dax_region(struct device *parent, int region_id,
16		struct range *range, int target_node, unsigned int align,
17		unsigned long flags);
18
19struct dev_dax_data {
20	struct dax_region *dax_region;
21	struct dev_pagemap *pgmap;
22	resource_size_t size;
23	int id;
24};
25
26struct dev_dax *devm_create_dev_dax(struct dev_dax_data *data);
27
28struct dax_device_driver {
29	struct device_driver drv;
30	struct list_head ids;
31	int match_always;
32	int (*probe)(struct dev_dax *dev);
33	void (*remove)(struct dev_dax *dev);
34};
35
36int __dax_driver_register(struct dax_device_driver *dax_drv,
37		struct module *module, const char *mod_name);
38#define dax_driver_register(driver) \
39	__dax_driver_register(driver, THIS_MODULE, KBUILD_MODNAME)
40void dax_driver_unregister(struct dax_device_driver *dax_drv);
41void kill_dev_dax(struct dev_dax *dev_dax);
42bool static_dev_dax(struct dev_dax *dev_dax);
43
44/*
45 * While run_dax() is potentially a generic operation that could be
46 * defined in include/linux/dax.h we don't want to grow any users
47 * outside of drivers/dax/
48 */
49void run_dax(struct dax_device *dax_dev);
50
51#define MODULE_ALIAS_DAX_DEVICE(type) \
52	MODULE_ALIAS("dax:t" __stringify(type) "*")
53#define DAX_DEVICE_MODALIAS_FMT "dax:t%d"
54
55#endif /* __DAX_BUS_H__ */