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 /* private routines between core files */
  20 struct dax_device;
  21 struct dax_device *inode_dax(struct inode *inode);
  22 struct inode *dax_inode(struct dax_device *dax_dev);
  23 int dax_bus_init(void);
  24 void dax_bus_exit(void);
  25
  26 /**
  27  * struct dax_region - mapping infrastructure for dax devices
  28  * @id: kernel-wide unique region for a memory range
  29  * @target_node: effective numa node if this memory range is onlined
  30  * @kref: to pin while other agents have a need to do lookups
  31  * @dev: parent device backing this region
  32  * @align: allocation and mapping alignment for child dax devices
  33  * @res: physical address range of the region
  34  * @pfn_flags: identify whether the pfns are paged back or not
  35  */
  36 struct dax_region {
  37         int id;
  38         int target_node;
  39         struct kref kref;
  40         struct device *dev;
  41         unsigned int align;
  42         struct resource res;
  43         unsigned long pfn_flags;
  44 };
  45
  46 /**
  47  * struct dev_dax - instance data for a subdivision of a dax region, and
  48  * data while the device is activated in the driver.
  49  * @region - parent region
  50  * @dax_dev - core dax functionality
  51  * @target_node: effective numa node if dev_dax memory range is onlined
  52  * @dev - device core
  53  * @pgmap - pgmap for memmap setup / lifetime (driver owned)
  54  * @ref: pgmap reference count (driver owned)
  55  * @cmp: @ref final put completion (driver owned)
  56  */
  57 struct dev_dax {
  58         struct dax_region *region;
  59         struct dax_device *dax_dev;
  60         int target_node;
  61         struct device dev;
  62         struct dev_pagemap pgmap;
  63         struct percpu_ref ref;
  64         struct completion cmp;
  65 };
  66
  67 static inline struct dev_dax *to_dev_dax(struct device *dev)
  68 {
  69         return container_of(dev, struct dev_dax, dev);
  70 }
  71 #endif