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/* SPDX-License-Identifier: GPL-2.0-only */
* Copyright(c) 2016 Intel Corporation. All rights reserved.
#ifndef __DAX_PRIVATE_H__
#define __DAX_PRIVATE_H__
#include <linux/device.h>
#include <linux/cdev.h>
/* private routines between core files */
struct dax_device;
struct dax_device *inode_dax(struct inode *inode);
struct inode *dax_inode(struct dax_device *dax_dev);
int dax_bus_init(void);
void dax_bus_exit(void);
* struct dax_region - mapping infrastructure for dax devices
* @id: kernel-wide unique region for a memory range
* @target_node: effective numa node if this memory range is onlined
* @kref: to pin while other agents have a need to do lookups
* @dev: parent device backing this region
* @align: allocation and mapping alignment for child dax devices
* @res: physical address range of the region
* @pfn_flags: identify whether the pfns are paged back or not
struct dax_region {
int id;
int target_node;
struct kref kref;
struct device *dev;
unsigned int align;
struct resource res;
unsigned long pfn_flags;
* struct dev_dax - instance data for a subdivision of a dax region, and
* data while the device is activated in the driver.
* @region - parent region
* @dax_dev - core dax functionality
* @target_node: effective numa node if dev_dax memory range is onlined
* @dev - device core
* @pgmap - pgmap for memmap setup / lifetime (driver owned)
* @dax_mem_res: physical address range of hotadded DAX memory
struct dev_dax {
struct dax_region *region;
struct dax_device *dax_dev;
int target_node;
struct device dev;
struct dev_pagemap pgmap;
struct resource *dax_kmem_res;
static inline struct dev_dax *to_dev_dax(struct device *dev)
return container_of(dev, struct dev_dax, dev);