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1 | /* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1) |
2 | * | |
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3 | * wrapper/genhd.h |
4 | * | |
5 | * wrapper around block layer functions and data structures. Using | |
6 | * KALLSYMS to get its address when available, else we need to have a | |
7 | * kernel that exports this function to GPL modules. | |
8 | * | |
9 | * Copyright (C) 2011-2014 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
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10 | */ |
11 | ||
9f36eaed MJ |
12 | #ifndef _LTTNG_WRAPPER_GENHD_H |
13 | #define _LTTNG_WRAPPER_GENHD_H | |
14 | ||
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15 | #include <linux/genhd.h> |
16 | ||
3bcb1fb3 | 17 | #ifdef CONFIG_KALLSYMS_ALL |
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18 | |
19 | #include <linux/kallsyms.h> | |
5a2f5e92 | 20 | #include <wrapper/kallsyms.h> |
f0dbdefb | 21 | |
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22 | static inline |
23 | struct class *wrapper_get_block_class(void) | |
24 | { | |
25 | struct class *ptr_block_class; | |
26 | ||
27 | ptr_block_class = (struct class *) kallsyms_lookup_dataptr("block_class"); | |
28 | if (!ptr_block_class) { | |
e36de50d | 29 | printk_once(KERN_WARNING "LTTng: block_class symbol lookup failed.\n"); |
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30 | return NULL; |
31 | } | |
32 | return ptr_block_class; | |
33 | } | |
34 | ||
35 | static inline | |
36 | struct device_type *wrapper_get_disk_type(void) | |
37 | { | |
38 | struct device_type *ptr_disk_type; | |
39 | ||
40 | ptr_disk_type = (struct device_type *) kallsyms_lookup_dataptr("disk_type"); | |
41 | if (!ptr_disk_type) { | |
e36de50d | 42 | printk_once(KERN_WARNING "LTTng: disk_type symbol lookup failed.\n"); |
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43 | return NULL; |
44 | } | |
45 | return ptr_disk_type; | |
46 | } | |
47 | ||
48 | #else | |
49 | ||
50 | static inline | |
51 | struct class *wrapper_get_block_class(void) | |
52 | { | |
53 | /* | |
54 | * Symbol block_class is not exported. | |
55 | * TODO: return &block_class; | |
56 | */ | |
57 | /* Feature currently unavailable without KALLSYMS_ALL */ | |
58 | return NULL; | |
59 | } | |
60 | ||
61 | static inline | |
62 | struct device_type *wrapper_get_disk_type(void) | |
63 | { | |
64 | /* | |
65 | * Symbol disk_type is not exported. | |
66 | * TODO: return &disk_type; | |
67 | */ | |
68 | /* Feature currently unavailable without KALLSYMS_ALL */ | |
69 | return NULL; | |
70 | } | |
71 | ||
72 | #endif | |
73 | ||
74 | #endif /* _LTTNG_WRAPPER_GENHD_H */ |