// SPDX-License-Identifier: GPL-2.0
  /* Copyright(c) 2016 - 2018 Intel Corporation. All rights reserved. */
  #ifndef __DAX_BUS_H__
  #define __DAX_BUS_H__

  #include <linux/device.h>

  #include <linux/range.h>

  struct dev_dax;
  struct resource;
  struct dax_device;
  struct dax_region;
  void dax_region_put(struct dax_region *dax_region);

  
  #define IORESOURCE_DAX_STATIC (1UL << 0)

  struct dax_region *alloc_dax_region(struct device *parent, int region_id,

  		struct range *range, int target_node, unsigned int align,

  		unsigned long flags);

  
  enum dev_dax_subsys {

  	DEV_DAX_BUS = 0, /* zeroed dev_dax_data picks this by default */

  	DEV_DAX_CLASS,
  };

  struct dev_dax_data {
  	struct dax_region *dax_region;
  	struct dev_pagemap *pgmap;
  	enum dev_dax_subsys subsys;

  	resource_size_t size;

  	int id;
  };

  struct dev_dax *devm_create_dev_dax(struct dev_dax_data *data);

  
  /* to be deleted when DEV_DAX_CLASS is removed */
  struct dev_dax *__dax_pmem_probe(struct device *dev, enum dev_dax_subsys subsys);

  
  struct dax_device_driver {
  	struct device_driver drv;
  	struct list_head ids;
  	int match_always;

  	int (*probe)(struct dev_dax *dev);
  	int (*remove)(struct dev_dax *dev);

  };
  
  int __dax_driver_register(struct dax_device_driver *dax_drv,

  		struct module *module, const char *mod_name);
  #define dax_driver_register(driver) \
  	__dax_driver_register(driver, THIS_MODULE, KBUILD_MODNAME)

  void dax_driver_unregister(struct dax_device_driver *dax_drv);

  void kill_dev_dax(struct dev_dax *dev_dax);

  #if IS_ENABLED(CONFIG_DEV_DAX_PMEM_COMPAT)

  int dev_dax_probe(struct dev_dax *dev_dax);

  #endif

  /*
   * While run_dax() is potentially a generic operation that could be
   * defined in include/linux/dax.h we don't want to grow any users
   * outside of drivers/dax/
   */
  void run_dax(struct dax_device *dax_dev);
  
  #define MODULE_ALIAS_DAX_DEVICE(type) \
  	MODULE_ALIAS("dax:t" __stringify(type) "*")
  #define DAX_DEVICE_MODALIAS_FMT "dax:t%d"

  #endif /* __DAX_BUS_H__ */