1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright(c) 2016 Intel Corporation. All rights reserved. 4 */ 5 #ifndef __DAX_PRIVATE_H__ 6 #define __DAX_PRIVATE_H__ 7 8 #include <linux/device.h> 9 #include <linux/cdev.h> 10 #include <linux/idr.h> 11 12 /* private routines between core files */ 13 struct dax_device; 14 struct dax_device *inode_dax(struct inode *inode); 15 struct inode *dax_inode(struct dax_device *dax_dev); 16 int dax_bus_init(void); 17 void dax_bus_exit(void); 18 19 /** 20 * struct dax_region - mapping infrastructure for dax devices 21 * @id: kernel-wide unique region for a memory range 22 * @target_node: effective numa node if this memory range is onlined 23 * @kref: to pin while other agents have a need to do lookups 24 * @dev: parent device backing this region 25 * @align: allocation and mapping alignment for child dax devices 26 * @ida: instance id allocator 27 * @res: resource tree to track instance allocations 28 * @seed: allow userspace to find the first unbound seed device 29 * @youngest: allow userspace to find the most recently created device 30 */ 31 struct dax_region { 32 int id; 33 int target_node; 34 struct kref kref; 35 struct device *dev; 36 unsigned int align; 37 struct ida ida; 38 struct resource res; 39 struct device *seed; 40 struct device *youngest; 41 }; 42 43 struct dax_mapping { 44 struct device dev; 45 int range_id; 46 int id; 47 }; 48 49 /** 50 * struct dev_dax - instance data for a subdivision of a dax region, and 51 * data while the device is activated in the driver. 52 * @region - parent region 53 * @dax_dev - core dax functionality 54 * @target_node: effective numa node if dev_dax memory range is onlined 55 * @id: ida allocated id 56 * @ida: mapping id allocator 57 * @dev - device core 58 * @pgmap - pgmap for memmap setup / lifetime (driver owned) 59 * @nr_range: size of @ranges 60 * @ranges: resource-span + pgoff tuples for the instance 61 */ 62 struct dev_dax { 63 struct dax_region *region; 64 struct dax_device *dax_dev; 65 unsigned int align; 66 int target_node; 67 int id; 68 struct ida ida; 69 struct device dev; 70 struct dev_pagemap *pgmap; 71 int nr_range; 72 struct dev_dax_range { 73 unsigned long pgoff; 74 struct range range; 75 struct dax_mapping *mapping; 76 } *ranges; 77 }; 78 79 static inline struct dev_dax *to_dev_dax(struct device *dev) 80 { 81 return container_of(dev, struct dev_dax, dev); 82 } 83 84 static inline struct dax_mapping *to_dax_mapping(struct device *dev) 85 { 86 return container_of(dev, struct dax_mapping, dev); 87 } 88 89 phys_addr_t dax_pgoff_to_phys(struct dev_dax *dev_dax, pgoff_t pgoff, unsigned long size); 90 91 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 92 static inline bool dax_align_valid(unsigned long align) 93 { 94 if (align == PUD_SIZE && IS_ENABLED(CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD)) 95 return true; 96 if (align == PMD_SIZE && has_transparent_hugepage()) 97 return true; 98 if (align == PAGE_SIZE) 99 return true; 100 return false; 101 } 102 #else 103 static inline bool dax_align_valid(unsigned long align) 104 { 105 return align == PAGE_SIZE; 106 } 107 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ 108 #endif 109