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#include <linux/idr.h>
 11
 12/* private routines between core files */
 13struct dax_device;
 14struct dax_device *inode_dax(struct inode *inode);
 15struct inode *dax_inode(struct dax_device *dax_dev);
 16int dax_bus_init(void);
 17void dax_bus_exit(void);
 18
 19/**
 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
 30 */
 31struct dax_region {
 32	int id;
 33	int target_node;
 34	struct kref kref;
 35	struct device *dev;
 36	unsigned int align;
 37	struct ida ida;
 38	struct resource res;
 39	struct device *seed;
 40	struct device *youngest;
 41};
 42
 43struct dax_mapping {
 44	struct device dev;
 45	int range_id;
 46	int id;
 47};
 48
 49/**
 50 * struct dev_dax - instance data for a subdivision of a dax region, and
 51 * data while the device is activated in the driver.
 52 * @region - parent region
 53 * @dax_dev - core dax functionality
 54 * @target_node: effective numa node if dev_dax memory range is onlined
 55 * @id: ida allocated id
 56 * @ida: mapping id allocator
 57 * @dev - device core
 58 * @pgmap - pgmap for memmap setup / lifetime (driver owned)
 59 * @nr_range: size of @ranges
 60 * @ranges: resource-span + pgoff tuples for the instance
 61 */
 62struct dev_dax {
 63	struct dax_region *region;
 64	struct dax_device *dax_dev;
 65	unsigned int align;
 66	int target_node;
 67	int id;
 68	struct ida ida;
 69	struct device dev;
 70	struct dev_pagemap *pgmap;
 71	int nr_range;
 72	struct dev_dax_range {
 73		unsigned long pgoff;
 74		struct range range;
 75		struct dax_mapping *mapping;
 76	} *ranges;
 77};
 78
 79static inline struct dev_dax *to_dev_dax(struct device *dev)
 80{
 81	return container_of(dev, struct dev_dax, dev);
 82}
 83
 84static inline struct dax_mapping *to_dax_mapping(struct device *dev)
 85{
 86	return container_of(dev, struct dax_mapping, dev);
 87}
 88
 89phys_addr_t dax_pgoff_to_phys(struct dev_dax *dev_dax, pgoff_t pgoff, unsigned long size);
 90
 91#ifdef CONFIG_TRANSPARENT_HUGEPAGE
 92static inline bool dax_align_valid(unsigned long align)
 93{
 94	if (align == PUD_SIZE && IS_ENABLED(CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD))
 95		return true;
 96	if (align == PMD_SIZE && has_transparent_hugepage())
 97		return true;
 98	if (align == PAGE_SIZE)
 99		return true;
100	return false;
101}
102#else
103static inline bool dax_align_valid(unsigned long align)
104{
105	return align == PAGE_SIZE;
106}
107#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
108#endif