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
   7 struct dev_dax;
   8 struct resource;
   9 struct dax_device;
  10 struct dax_region;
  11 void dax_region_put(struct dax_region *dax_region);
  12 struct dax_region *alloc_dax_region(struct device *parent, int region_id,
  13                 struct resource *res, int target_node, unsigned int align,
  14                 unsigned long flags);
  15
  16 enum dev_dax_subsys {
  17         DEV_DAX_BUS,
  18         DEV_DAX_CLASS,
  19 };
  20
  21 struct dev_dax *__devm_create_dev_dax(struct dax_region *dax_region, int id,
  22                 struct dev_pagemap *pgmap, enum dev_dax_subsys subsys);
  23
  24 static inline struct dev_dax *devm_create_dev_dax(struct dax_region *dax_region,
  25                 int id, struct dev_pagemap *pgmap)
  26 {
  27         return __devm_create_dev_dax(dax_region, id, pgmap, DEV_DAX_BUS);
  28 }
  29
  30 /* to be deleted when DEV_DAX_CLASS is removed */
  31 struct dev_dax *__dax_pmem_probe(struct device *dev, enum dev_dax_subsys subsys);
  32
  33 struct dax_device_driver {
  34         struct device_driver drv;
  35         struct list_head ids;
  36         int match_always;
  37 };
  38
  39 int __dax_driver_register(struct dax_device_driver *dax_drv,
  40                 struct module *module, const char *mod_name);
  41 #define dax_driver_register(driver) \
  42         __dax_driver_register(driver, THIS_MODULE, KBUILD_MODNAME)
  43 void dax_driver_unregister(struct dax_device_driver *dax_drv);
  44 void kill_dev_dax(struct dev_dax *dev_dax);
  45
  46 #if IS_ENABLED(CONFIG_DEV_DAX_PMEM_COMPAT)
  47 int dev_dax_probe(struct device *dev);
  48 #endif
  49
  50 /*
  51  * While run_dax() is potentially a generic operation that could be
  52  * defined in include/linux/dax.h we don't want to grow any users
  53  * outside of drivers/dax/
  54  */
  55 void run_dax(struct dax_device *dax_dev);
  56
  57 #define MODULE_ALIAS_DAX_DEVICE(type) \
  58         MODULE_ALIAS("dax:t" __stringify(type) "*")
  59 #define DAX_DEVICE_MODALIAS_FMT "dax:t%d"
  60
  61 #endif /* __DAX_BUS_H__ */