linux/drivers/dax/dax-private.h

/* 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 { … };

struct dax_mapping { … };

/**
 * 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
 * @dyn_id: is this a dynamic or statically created instance
 * @id: ida allocated id when the dax_region is not static
 * @ida: mapping id allocator
 * @dev - device core
 * @pgmap - pgmap for memmap setup / lifetime (driver owned)
 * @nr_range: size of @ranges
 * @ranges: resource-span + pgoff tuples for the instance
 */
struct dev_dax { … };

/*
 * While run_dax() is potentially a generic operation that could be
 * defined in include/linux/dax.h we don't want to grow any users
 * outside of drivers/dax/
 */
void run_dax(struct dax_device *dax_dev);

static inline struct dev_dax *to_dev_dax(struct device *dev)
{ … }

static inline struct dax_mapping *to_dax_mapping(struct device *dev)
{ … }

phys_addr_t dax_pgoff_to_phys(struct dev_dax *dev_dax, pgoff_t pgoff, unsigned long size);

#ifdef CONFIG_TRANSPARENT_HUGEPAGE
static inline bool dax_align_valid(unsigned long align)
{ … }
#else
static inline bool dax_align_valid(unsigned long align)
{
	return align == PAGE_SIZE;
}
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
#endif