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 */
12 struct dax_device;
13 struct dax_device *inode_dax(struct inode *inode);
14 struct inode *dax_inode(struct dax_device *dax_dev);
15 int dax_bus_init(void);
16 void 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 */
28 struct 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 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 */
48 struct dev_dax {
49 struct dax_region *region;
50 struct dax_device *dax_dev;
51 int target_node;
52 struct device dev;
53 struct dev_pagemap pgmap;
54 struct resource *dax_kmem_res;
55 };
56
57 static inline struct dev_dax *to_dev_dax(struct device *dev)
58 {
59 return container_of(dev, struct dev_dax, dev);
60 }
61 #endif