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 void dax_region_put(struct dax_region *dax_region); 13 14 #define IORESOURCE_DAX_STATIC (1UL << 0) 15 struct dax_region *alloc_dax_region(struct device *parent, int region_id, 16 struct range *range, int target_node, unsigned int align, 17 unsigned long flags); 18 19 enum dev_dax_subsys { 20 DEV_DAX_BUS = 0, /* zeroed dev_dax_data picks this by default */ 21 DEV_DAX_CLASS, 22 }; 23 24 struct dev_dax_data { 25 struct dax_region *dax_region; 26 struct dev_pagemap *pgmap; 27 enum dev_dax_subsys subsys; 28 resource_size_t size; 29 int id; 30 }; 31 32 struct dev_dax *devm_create_dev_dax(struct dev_dax_data *data); 33 34 /* to be deleted when DEV_DAX_CLASS is removed */ 35 struct dev_dax *__dax_pmem_probe(struct device *dev, enum dev_dax_subsys subsys); 36 37 struct dax_device_driver { 38 struct device_driver drv; 39 struct list_head ids; 40 int match_always; 41 int (*probe)(struct dev_dax *dev); 42 void (*remove)(struct dev_dax *dev); 43 }; 44 45 int __dax_driver_register(struct dax_device_driver *dax_drv, 46 struct module *module, const char *mod_name); 47 #define dax_driver_register(driver) \ 48 __dax_driver_register(driver, THIS_MODULE, KBUILD_MODNAME) 49 void dax_driver_unregister(struct dax_device_driver *dax_drv); 50 void kill_dev_dax(struct dev_dax *dev_dax); 51 52 #if IS_ENABLED(CONFIG_DEV_DAX_PMEM_COMPAT) 53 int dev_dax_probe(struct dev_dax *dev_dax); 54 #endif 55 56 /* 57 * While run_dax() is potentially a generic operation that could be 58 * defined in include/linux/dax.h we don't want to grow any users 59 * outside of drivers/dax/ 60 */ 61 void run_dax(struct dax_device *dax_dev); 62 63 #define MODULE_ALIAS_DAX_DEVICE(type) \ 64 MODULE_ALIAS("dax:t" __stringify(type) "*") 65 #define DAX_DEVICE_MODALIAS_FMT "dax:t%d" 66 67 #endif /* __DAX_BUS_H__ */ 68