1/*
 2 * Copyright(c) 2016 Intel Corporation. All rights reserved.
 3 *
 4 * This program is free software; you can redistribute it and/or modify
 5 * it under the terms of version 2 of the GNU General Public License as
 6 * published by the Free Software Foundation.
 7 *
 8 * This program is distributed in the hope that it will be useful, but
 9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
11 * General Public License for more details.
12 */
13#ifndef __DAX_PRIVATE_H__
14#define __DAX_PRIVATE_H__
15
16#include <linux/device.h>
17#include <linux/cdev.h>
18
19/**
20 * struct dax_region - mapping infrastructure for dax devices
21 * @id: kernel-wide unique region for a memory range
22 * @base: linear address corresponding to @res
23 * @kref: to pin while other agents have a need to do lookups
24 * @dev: parent device backing this region
25 * @align: allocation and mapping alignment for child dax devices
26 * @res: physical address range of the region
27 * @pfn_flags: identify whether the pfns are paged back or not
28 */
29struct dax_region {
30	int id;
31	struct ida ida;
32	void *base;
33	struct kref kref;
34	struct device *dev;
35	unsigned int align;
36	struct resource res;
37	unsigned long pfn_flags;
38};
39
40/**
41 * struct dev_dax - instance data for a subdivision of a dax region
42 * @region - parent region
43 * @dax_dev - core dax functionality
44 * @dev - device core
45 * @id - child id in the region
46 * @num_resources - number of physical address extents in this device
47 * @res - array of physical address ranges
48 */
49struct dev_dax {
50	struct dax_region *region;
51	struct dax_device *dax_dev;
52	struct device dev;
53	int id;
54	int num_resources;
55	struct resource res[0];
56};
57#endif