blob: b6fc4f04636de1cd52d4195331b1e4168847bb1e [file] [log] [blame]
Dave Jiangefebc712017-04-07 15:33:36 -07001/*
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/**
Dan Williams73616362017-05-04 23:38:43 -070041 * struct dev_dax - instance data for a subdivision of a dax region
Dave Jiangefebc712017-04-07 15:33:36 -070042 * @region - parent region
Dan Williams73616362017-05-04 23:38:43 -070043 * @dax_dev - core dax functionality
44 * @dev - device core
Dave Jiangefebc712017-04-07 15:33:36 -070045 * @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 */
Dan Williams73616362017-05-04 23:38:43 -070049struct dev_dax {
Dave Jiangefebc712017-04-07 15:33:36 -070050 struct dax_region *region;
Dan Williams73616362017-05-04 23:38:43 -070051 struct dax_device *dax_dev;
Dave Jiangefebc712017-04-07 15:33:36 -070052 struct device dev;
Dave Jiangefebc712017-04-07 15:33:36 -070053 int id;
54 int num_resources;
55 struct resource res[0];
56};
57#endif