drivers/dax/bus.h

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright(c) 2016 - 2018 Intel Corporation. All rights reserved. */
   3 #ifndef __DAX_BUS_H__
   4 #define __DAX_BUS_H__
   5 #include <linux/device.h>
   6 #include <linux/range.h>
   7
   8 struct dev_dax;
   9 struct resource;
  10 struct dax_device;
  11 struct dax_region;
  12
  13 /* dax bus specific ioresource flags */
  14 #define IORESOURCE_DAX_STATIC BIT(0)
  15 #define IORESOURCE_DAX_KMEM BIT(1)
  16
  17 struct dax_region *alloc_dax_region(struct device *parent, int region_id,
  18                 struct range *range, int target_node, unsigned int align,
  19                 unsigned long flags);
  20
  21 struct dev_dax_data {
  22         struct dax_region *dax_region;
  23         struct dev_pagemap *pgmap;
  24         resource_size_t size;
  25         int id;
  26         bool memmap_on_memory;
  27 };
  28
  29 struct dev_dax *devm_create_dev_dax(struct dev_dax_data *data);
  30
  31 enum dax_driver_type {
  32         DAXDRV_KMEM_TYPE,
  33         DAXDRV_DEVICE_TYPE,
  34 };
  35
  36 struct dax_device_driver {
  37         struct device_driver drv;
  38         struct list_head ids;
  39         enum dax_driver_type type;
  40         int (*probe)(struct dev_dax *dev);
  41         void (*remove)(struct dev_dax *dev);
  42 };
  43
  44 int __dax_driver_register(struct dax_device_driver *dax_drv,
  45                 struct module *module, const char *mod_name);
  46 #define dax_driver_register(driver) \
  47         __dax_driver_register(driver, THIS_MODULE, KBUILD_MODNAME)
  48 void dax_driver_unregister(struct dax_device_driver *dax_drv);
  49 void kill_dev_dax(struct dev_dax *dev_dax);
  50 bool static_dev_dax(struct dev_dax *dev_dax);
  51
  52 #define MODULE_ALIAS_DAX_DEVICE(type) \
  53         MODULE_ALIAS("dax:t" __stringify(type) "*")
  54 #define DAX_DEVICE_MODALIAS_FMT "dax:t%d"
  55
  56 #endif /* __DAX_BUS_H__ */