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d8187177 RC |
1 | /* |
2 | * Copyright (C) 2016 Red Hat | |
3 | * | |
4 | * Permission is hereby granted, free of charge, to any person obtaining a | |
5 | * copy of this software and associated documentation files (the "Software"), | |
6 | * to deal in the Software without restriction, including without limitation | |
7 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
8 | * and/or sell copies of the Software, and to permit persons to whom the | |
9 | * Software is furnished to do so, subject to the following conditions: | |
10 | * | |
11 | * The above copyright notice and this permission notice shall be included in | |
12 | * all copies or substantial portions of the Software. | |
13 | * | |
14 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
15 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
16 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
17 | * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR | |
18 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, | |
19 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR | |
20 | * OTHER DEALINGS IN THE SOFTWARE. | |
21 | * | |
22 | * Authors: | |
23 | * Rob Clark <robdclark@gmail.com> | |
24 | */ | |
25 | ||
26 | #ifndef DRM_PRINT_H_ | |
27 | #define DRM_PRINT_H_ | |
28 | ||
3c6d6e0f JP |
29 | #include <linux/compiler.h> |
30 | #include <linux/printk.h> | |
d8187177 RC |
31 | #include <linux/seq_file.h> |
32 | #include <linux/device.h> | |
33 | ||
34 | /** | |
35 | * DOC: print | |
36 | * | |
37 | * A simple wrapper for dev_printk(), seq_printf(), etc. Allows same | |
38 | * debug code to be used for both debugfs and printk logging. | |
39 | * | |
40 | * For example:: | |
41 | * | |
42 | * void log_some_info(struct drm_printer *p) | |
43 | * { | |
44 | * drm_printf(p, "foo=%d\n", foo); | |
45 | * drm_printf(p, "bar=%d\n", bar); | |
46 | * } | |
47 | * | |
48 | * #ifdef CONFIG_DEBUG_FS | |
49 | * void debugfs_show(struct seq_file *f) | |
50 | * { | |
51 | * struct drm_printer p = drm_seq_file_printer(f); | |
52 | * log_some_info(&p); | |
53 | * } | |
54 | * #endif | |
55 | * | |
56 | * void some_other_function(...) | |
57 | * { | |
58 | * struct drm_printer p = drm_info_printer(drm->dev); | |
59 | * log_some_info(&p); | |
60 | * } | |
61 | */ | |
62 | ||
63 | /** | |
64 | * struct drm_printer - drm output "stream" | |
d8187177 RC |
65 | * |
66 | * Do not use struct members directly. Use drm_printer_seq_file(), | |
67 | * drm_printer_info(), etc to initialize. And drm_printf() for output. | |
68 | */ | |
69 | struct drm_printer { | |
3d387d92 | 70 | /* private: */ |
d8187177 RC |
71 | void (*printfn)(struct drm_printer *p, struct va_format *vaf); |
72 | void *arg; | |
3d387d92 | 73 | const char *prefix; |
d8187177 RC |
74 | }; |
75 | ||
76 | void __drm_printfn_seq_file(struct drm_printer *p, struct va_format *vaf); | |
77 | void __drm_printfn_info(struct drm_printer *p, struct va_format *vaf); | |
3d387d92 | 78 | void __drm_printfn_debug(struct drm_printer *p, struct va_format *vaf); |
d8187177 | 79 | |
3c6d6e0f | 80 | __printf(2, 3) |
d8187177 RC |
81 | void drm_printf(struct drm_printer *p, const char *f, ...); |
82 | ||
83 | ||
84 | /** | |
85 | * drm_seq_file_printer - construct a &drm_printer that outputs to &seq_file | |
ea0dd85a | 86 | * @f: the &struct seq_file to output to |
d8187177 RC |
87 | * |
88 | * RETURNS: | |
89 | * The &drm_printer object | |
90 | */ | |
91 | static inline struct drm_printer drm_seq_file_printer(struct seq_file *f) | |
92 | { | |
93 | struct drm_printer p = { | |
94 | .printfn = __drm_printfn_seq_file, | |
95 | .arg = f, | |
96 | }; | |
97 | return p; | |
98 | } | |
99 | ||
100 | /** | |
101 | * drm_info_printer - construct a &drm_printer that outputs to dev_printk() | |
ea0dd85a | 102 | * @dev: the &struct device pointer |
d8187177 RC |
103 | * |
104 | * RETURNS: | |
105 | * The &drm_printer object | |
106 | */ | |
107 | static inline struct drm_printer drm_info_printer(struct device *dev) | |
108 | { | |
109 | struct drm_printer p = { | |
110 | .printfn = __drm_printfn_info, | |
111 | .arg = dev, | |
112 | }; | |
113 | return p; | |
114 | } | |
115 | ||
3d387d92 DV |
116 | /** |
117 | * drm_debug_printer - construct a &drm_printer that outputs to pr_debug() | |
118 | * @prefix: debug output prefix | |
119 | * | |
120 | * RETURNS: | |
121 | * The &drm_printer object | |
122 | */ | |
123 | static inline struct drm_printer drm_debug_printer(const char *prefix) | |
124 | { | |
125 | struct drm_printer p = { | |
126 | .printfn = __drm_printfn_debug, | |
127 | .prefix = prefix | |
128 | }; | |
129 | return p; | |
130 | } | |
d8187177 | 131 | #endif /* DRM_PRINT_H_ */ |