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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 */
13struct dax_device;
14struct dax_device *inode_dax(struct inode *inode);
15struct inode *dax_inode(struct dax_device *dax_dev);
16int dax_bus_init(void);
17void 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 */
31struct 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
43struct 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 * @dyn_id: is this a dynamic or statically created instance
56 * @id: ida allocated id when the dax_region is not static
57 * @ida: mapping id allocator
58 * @dev - device core
59 * @pgmap - pgmap for memmap setup / lifetime (driver owned)
60 * @nr_range: size of @ranges
61 * @ranges: resource-span + pgoff tuples for the instance
62 */
63struct dev_dax {
64 struct dax_region *region;
65 struct dax_device *dax_dev;
66 unsigned int align;
67 int target_node;
68 bool dyn_id;
69 int id;
70 struct ida ida;
71 struct device dev;
72 struct dev_pagemap *pgmap;
73 bool memmap_on_memory;
74 int nr_range;
75 struct dev_dax_range {
76 unsigned long pgoff;
77 struct range range;
78 struct dax_mapping *mapping;
79 } *ranges;
80};
81
82/*
83 * While run_dax() is potentially a generic operation that could be
84 * defined in include/linux/dax.h we don't want to grow any users
85 * outside of drivers/dax/
86 */
87void run_dax(struct dax_device *dax_dev);
88
89static inline struct dev_dax *to_dev_dax(struct device *dev)
90{
91 return container_of(dev, struct dev_dax, dev);
92}
93
94static inline struct dax_mapping *to_dax_mapping(struct device *dev)
95{
96 return container_of(dev, struct dax_mapping, dev);
97}
98
99phys_addr_t dax_pgoff_to_phys(struct dev_dax *dev_dax, pgoff_t pgoff, unsigned long size);
100
101#ifdef CONFIG_TRANSPARENT_HUGEPAGE
102static inline bool dax_align_valid(unsigned long align)
103{
104 if (align == PUD_SIZE && IS_ENABLED(CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD))
105 return true;
106 if (align == PMD_SIZE && has_transparent_hugepage())
107 return true;
108 if (align == PAGE_SIZE)
109 return true;
110 return false;
111}
112#else
113static inline bool dax_align_valid(unsigned long align)
114{
115 return align == PAGE_SIZE;
116}
117#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
118#endif
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
11/* private routines between core files */
12struct dax_device;
13struct dax_device *inode_dax(struct inode *inode);
14struct inode *dax_inode(struct dax_device *dax_dev);
15int dax_bus_init(void);
16void dax_bus_exit(void);
17
18/**
19 * struct dax_region - mapping infrastructure for dax devices
20 * @id: kernel-wide unique region for a memory range
21 * @target_node: effective numa node if this memory range is onlined
22 * @kref: to pin while other agents have a need to do lookups
23 * @dev: parent device backing this region
24 * @align: allocation and mapping alignment for child dax devices
25 * @res: physical address range of the region
26 * @pfn_flags: identify whether the pfns are paged back or not
27 */
28struct dax_region {
29 int id;
30 int target_node;
31 struct kref kref;
32 struct device *dev;
33 unsigned int align;
34 struct resource res;
35 unsigned long long pfn_flags;
36};
37
38/**
39 * struct dev_dax - instance data for a subdivision of a dax region, and
40 * data while the device is activated in the driver.
41 * @region - parent region
42 * @dax_dev - core dax functionality
43 * @target_node: effective numa node if dev_dax memory range is onlined
44 * @dev - device core
45 * @pgmap - pgmap for memmap setup / lifetime (driver owned)
46 * @dax_mem_res: physical address range of hotadded DAX memory
47 * @dax_mem_name: name for hotadded DAX memory via add_memory_driver_managed()
48 */
49struct dev_dax {
50 struct dax_region *region;
51 struct dax_device *dax_dev;
52 int target_node;
53 struct device dev;
54 struct dev_pagemap pgmap;
55 struct resource *dax_kmem_res;
56};
57
58static inline struct dev_dax *to_dev_dax(struct device *dev)
59{
60 return container_of(dev, struct dev_dax, dev);
61}
62#endif