drivers/dax/dax-private.h

   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