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 * @pfn_flags: identify whether the pfns are paged back or not 27 */ 28 struct dax_region { 29 int id; 30 int target_node; 31 struct kref kref; 32 struct device *dev; 33 unsigned int align; 34 struct resource res; 35 unsigned long pfn_flags; 36 }; 37 38 /** 39 * struct dev_dax - instance data for a subdivision of a dax region, and 40 * data while the device is activated in the driver. 41 * @region - parent region 42 * @dax_dev - core dax functionality 43 * @target_node: effective numa node if dev_dax memory range is onlined 44 * @dev - device core 45 * @pgmap - pgmap for memmap setup / lifetime (driver owned) 46 * @ref: pgmap reference count (driver owned) 47 * @cmp: @ref final put completion (driver owned) 48 */ 49 struct dev_dax { 50 struct dax_region *region; 51 struct dax_device *dax_dev; 52 int target_node; 53 struct device dev; 54 struct dev_pagemap pgmap; 55 struct percpu_ref ref; 56 struct completion cmp; 57 }; 58 59 static inline struct dev_dax *to_dev_dax(struct device *dev) 60 { 61 return container_of(dev, struct dev_dax, dev); 62 } 63 #endif 64