1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * Copyright(c) 2016 Intel Corporation. All rights reserved.
5 #ifndef __DAX_PRIVATE_H__
6 #define __DAX_PRIVATE_H__
8 #include <linux/device.h>
9 #include <linux/cdev.h>
10 #include <linux/idr.h>
12 /* private routines between core files */
14 struct dax_device *inode_dax(struct inode *inode);
15 struct inode *dax_inode(struct dax_device *dax_dev);
16 int dax_bus_init(void);
17 void dax_bus_exit(void);
20 * struct dax_region - mapping infrastructure for dax devices
21 * @id: kernel-wide unique region for a memory range
22 * @target_node: effective numa node if this memory range is onlined
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 * @ida: instance id allocator
27 * @res: resource tree to track instance allocations
28 * @seed: allow userspace to find the first unbound seed device
29 * @youngest: allow userspace to find the most recently created device
40 struct device *youngest;
44 * struct dev_dax - instance data for a subdivision of a dax region, and
45 * data while the device is activated in the driver.
46 * @region - parent region
47 * @dax_dev - core dax functionality
48 * @target_node: effective numa node if dev_dax memory range is onlined
49 * @id: ida allocated id
51 * @pgmap - pgmap for memmap setup / lifetime (driver owned)
52 * @range: resource range for the instance
55 struct dax_region *region;
56 struct dax_device *dax_dev;
60 struct dev_pagemap *pgmap;
64 static inline u64 range_len(struct range *range)
66 return range->end - range->start + 1;
69 static inline struct dev_dax *to_dev_dax(struct device *dev)
71 return container_of(dev, struct dev_dax, dev);