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 11 /* private routines between core files */ 12 struct dax_device; 13 struct dax_device *inode_dax(struct inode *inode); 14 struct inode *dax_inode(struct dax_device *dax_dev); 15 int dax_bus_init(void); 16 void dax_bus_exit(void); 17 18 /** 19 * struct dax_region - mapping infrastructure for dax devices 20 * @id: kernel-wide unique region for a memory range 21 * @target_node: effective numa node if this memory range is onlined 22 * @kref: to pin while other agents have a need to do lookups 23 * @dev: parent device backing this region 24 * @align: allocation and mapping alignment for child dax devices 25 * @res: physical address range of the region 26 */ 27 struct dax_region { 28 int id; 29 int target_node; 30 struct kref kref; 31 struct device *dev; 32 unsigned int align; 33 struct resource res; 34 }; 35 36 /** 37 * struct dev_dax - instance data for a subdivision of a dax region, and 38 * data while the device is activated in the driver. 39 * @region - parent region 40 * @dax_dev - core dax functionality 41 * @target_node: effective numa node if dev_dax memory range is onlined 42 * @dev - device core 43 * @pgmap - pgmap for memmap setup / lifetime (driver owned) 44 * @dax_mem_res: physical address range of hotadded DAX memory 45 * @dax_mem_name: name for hotadded DAX memory via add_memory_driver_managed() 46 */ 47 struct dev_dax { 48 struct dax_region *region; 49 struct dax_device *dax_dev; 50 int target_node; 51 struct device dev; 52 struct dev_pagemap pgmap; 53 struct resource *dax_kmem_res; 54 }; 55 56 static inline struct dev_dax *to_dev_dax(struct device *dev) 57 { 58 return container_of(dev, struct dev_dax, dev); 59 } 60 #endif 61