1 /* 2 * Copyright(c) 2016 Intel Corporation. All rights reserved. 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of version 2 of the GNU General Public License as 6 * published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope that it will be useful, but 9 * WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 11 * General Public License for more details. 12 */ 13 #ifndef __DAX_PRIVATE_H__ 14 #define __DAX_PRIVATE_H__ 15 16 #include <linux/device.h> 17 #include <linux/cdev.h> 18 19 /** 20 * struct dax_region - mapping infrastructure for dax devices 21 * @id: kernel-wide unique region for a memory range 22 * @base: linear address corresponding to @res 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 * @res: physical address range of the region 27 * @pfn_flags: identify whether the pfns are paged back or not 28 */ 29 struct dax_region { 30 int id; 31 struct ida ida; 32 void *base; 33 struct kref kref; 34 struct device *dev; 35 unsigned int align; 36 struct resource res; 37 unsigned long pfn_flags; 38 }; 39 40 /** 41 * struct dev_dax - instance data for a subdivision of a dax region 42 * @region - parent region 43 * @dax_dev - core dax functionality 44 * @dev - device core 45 * @id - child id in the region 46 * @num_resources - number of physical address extents in this device 47 * @res - array of physical address ranges 48 */ 49 struct dev_dax { 50 struct dax_region *region; 51 struct dax_device *dax_dev; 52 struct device dev; 53 int id; 54 int num_resources; 55 struct resource res[0]; 56 }; 57 #endif 58