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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>
#include <linux/idr.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
* @ida: instance id allocator
* @res: resource tree to track instance allocations
* @seed: allow userspace to find the first unbound seed device
* @youngest: allow userspace to find the most recently created device
*/
struct dax_region {
int id;
int target_node;
struct kref kref;
struct device *dev;
unsigned int align;
struct ida ida;
struct resource res;
struct device *seed;
struct device *youngest;
};
/**
* 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
* @id: ida allocated id
* @dev - device core
* @pgmap - pgmap for memmap setup / lifetime (driver owned)
* @range: resource range for the instance
*/
struct dev_dax {
struct dax_region *region;
struct dax_device *dax_dev;
int target_node;
int id;
struct device dev;
struct dev_pagemap *pgmap;
struct range range;
};
static inline u64 range_len(struct range *range)
{
return range->end - range->start + 1;
}
static inline struct dev_dax *to_dev_dax(struct device *dev)
{
return container_of(dev, struct dev_dax, dev);
}
#endif
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