1/* SPDX-License-Identifier: GPL-2.0-only */
 2/*
 3 * Copyright(c) 2016 Intel Corporation. All rights reserved.
 4 */
 5#ifndef __DAX_PRIVATE_H__
 6#define __DAX_PRIVATE_H__
 7
 8#include <linux/device.h>
 9#include <linux/cdev.h>
10
11/* private routines between core files */
12struct dax_device;
13struct dax_device *inode_dax(struct inode *inode);
14struct inode *dax_inode(struct dax_device *dax_dev);
15int dax_bus_init(void);
16void dax_bus_exit(void);
17
18/**
19 * struct dax_region - mapping infrastructure for dax devices
20 * @id: kernel-wide unique region for a memory range
21 * @target_node: effective numa node if this memory range is onlined
22 * @kref: to pin while other agents have a need to do lookups
23 * @dev: parent device backing this region
24 * @align: allocation and mapping alignment for child dax devices
25 * @res: physical address range of the region
26 * @pfn_flags: identify whether the pfns are paged back or not
27 */
28struct dax_region {
29	int id;
30	int target_node;
31	struct kref kref;
32	struct device *dev;
33	unsigned int align;
34	struct resource res;
35	unsigned long long pfn_flags;
36};
37
38/**
39 * struct dev_dax - instance data for a subdivision of a dax region, and
40 * data while the device is activated in the driver.
41 * @region - parent region
42 * @dax_dev - core dax functionality
43 * @target_node: effective numa node if dev_dax memory range is onlined
44 * @dev - device core
45 * @pgmap - pgmap for memmap setup / lifetime (driver owned)
46 * @dax_mem_res: physical address range of hotadded DAX memory
47 * @dax_mem_name: name for hotadded DAX memory via add_memory_driver_managed()
48 */
49struct dev_dax {
50	struct dax_region *region;
51	struct dax_device *dax_dev;
52	int target_node;
53	struct device dev;
54	struct dev_pagemap pgmap;
55	struct resource *dax_kmem_res;
56};
57
58static inline struct dev_dax *to_dev_dax(struct device *dev)
59{
60	return container_of(dev, struct dev_dax, dev);
61}
62#endif