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 */ 13 struct dax_device; 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); 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 */ 31 struct 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 43 /** 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 50 * @dev - device core 51 * @pgmap - pgmap for memmap setup / lifetime (driver owned) 52 * @range: resource range for the instance 53 */ 54 struct dev_dax { 55 struct dax_region *region; 56 struct dax_device *dax_dev; 57 int target_node; 58 int id; 59 struct device dev; 60 struct dev_pagemap *pgmap; 61 struct range range; 62 }; 63 64 static inline u64 range_len(struct range *range) 65 { 66 return range->end - range->start + 1; 67 } 68 69 static inline struct dev_dax *to_dev_dax(struct device *dev) 70 { 71 return container_of(dev, struct dev_dax, dev); 72 } 73 #endif 74