2 * Copyright (C) 2016 Red Hat
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:
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
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.
23 * Rob Clark <robdclark@gmail.com>
29 #include <linux/compiler.h>
30 #include <linux/printk.h>
31 #include <linux/seq_file.h>
32 #include <linux/device.h>
37 * A simple wrapper for dev_printk(), seq_printf(), etc. Allows same
38 * debug code to be used for both debugfs and printk logging.
42 * void log_some_info(struct drm_printer *p)
44 * drm_printf(p, "foo=%d\n", foo);
45 * drm_printf(p, "bar=%d\n", bar);
48 * #ifdef CONFIG_DEBUG_FS
49 * void debugfs_show(struct seq_file *f)
51 * struct drm_printer p = drm_seq_file_printer(f);
56 * void some_other_function(...)
58 * struct drm_printer p = drm_info_printer(drm->dev);
64 * struct drm_printer - drm output "stream"
66 * Do not use struct members directly. Use drm_printer_seq_file(),
67 * drm_printer_info(), etc to initialize. And drm_printf() for output.
71 void (*printfn)(struct drm_printer *p, struct va_format *vaf);
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);
78 void __drm_printfn_debug(struct drm_printer *p, struct va_format *vaf);
81 void drm_printf(struct drm_printer *p, const char *f, ...);
84 * drm_printf_indent - Print to a &drm_printer stream with indentation
85 * @printer: DRM printer
86 * @indent: Tab indentation level (max 5)
89 #define drm_printf_indent(printer, indent, fmt, ...) \
90 drm_printf((printer), "%.*s" fmt, (indent), "\t\t\t\t\tX", ##__VA_ARGS__)
93 * drm_seq_file_printer - construct a &drm_printer that outputs to &seq_file
94 * @f: the &struct seq_file to output to
97 * The &drm_printer object
99 static inline struct drm_printer drm_seq_file_printer(struct seq_file *f)
101 struct drm_printer p = {
102 .printfn = __drm_printfn_seq_file,
109 * drm_info_printer - construct a &drm_printer that outputs to dev_printk()
110 * @dev: the &struct device pointer
113 * The &drm_printer object
115 static inline struct drm_printer drm_info_printer(struct device *dev)
117 struct drm_printer p = {
118 .printfn = __drm_printfn_info,
125 * drm_debug_printer - construct a &drm_printer that outputs to pr_debug()
126 * @prefix: debug output prefix
129 * The &drm_printer object
131 static inline struct drm_printer drm_debug_printer(const char *prefix)
133 struct drm_printer p = {
134 .printfn = __drm_printfn_debug,
141 * The following categories are defined:
143 * CORE: Used in the generic drm code: drm_ioctl.c, drm_mm.c, drm_memory.c, ...
144 * This is the category used by the DRM_DEBUG() macro.
146 * DRIVER: Used in the vendor specific part of the driver: i915, radeon, ...
147 * This is the category used by the DRM_DEBUG_DRIVER() macro.
149 * KMS: used in the modesetting code.
150 * This is the category used by the DRM_DEBUG_KMS() macro.
152 * PRIME: used in the prime code.
153 * This is the category used by the DRM_DEBUG_PRIME() macro.
155 * ATOMIC: used in the atomic code.
156 * This is the category used by the DRM_DEBUG_ATOMIC() macro.
158 * VBL: used for verbose debug message in the vblank code
159 * This is the category used by the DRM_DEBUG_VBL() macro.
161 * Enabling verbose debug messages is done through the drm.debug parameter,
162 * each category being enabled by a bit.
164 * drm.debug=0x1 will enable CORE messages
165 * drm.debug=0x2 will enable DRIVER messages
166 * drm.debug=0x3 will enable CORE and DRIVER messages
168 * drm.debug=0x3f will enable all messages
170 * An interesting feature is that it's possible to enable verbose logging at
171 * run-time by echoing the debug value in its sysfs node:
172 * # echo 0xf > /sys/module/drm/parameters/debug
174 #define DRM_UT_NONE 0x00
175 #define DRM_UT_CORE 0x01
176 #define DRM_UT_DRIVER 0x02
177 #define DRM_UT_KMS 0x04
178 #define DRM_UT_PRIME 0x08
179 #define DRM_UT_ATOMIC 0x10
180 #define DRM_UT_VBL 0x20
181 #define DRM_UT_STATE 0x40
182 #define DRM_UT_LEASE 0x80
185 void drm_dev_printk(const struct device *dev, const char *level,
186 unsigned int category, const char *function_name,
187 const char *prefix, const char *format, ...);
189 void drm_printk(const char *level, unsigned int category,
190 const char *format, ...);
192 /* Macros to make printk easier */
194 #define _DRM_PRINTK(once, level, fmt, ...) \
196 printk##once(KERN_##level "[" DRM_NAME "] " fmt, \
200 #define DRM_INFO(fmt, ...) \
201 _DRM_PRINTK(, INFO, fmt, ##__VA_ARGS__)
202 #define DRM_NOTE(fmt, ...) \
203 _DRM_PRINTK(, NOTICE, fmt, ##__VA_ARGS__)
204 #define DRM_WARN(fmt, ...) \
205 _DRM_PRINTK(, WARNING, fmt, ##__VA_ARGS__)
207 #define DRM_INFO_ONCE(fmt, ...) \
208 _DRM_PRINTK(_once, INFO, fmt, ##__VA_ARGS__)
209 #define DRM_NOTE_ONCE(fmt, ...) \
210 _DRM_PRINTK(_once, NOTICE, fmt, ##__VA_ARGS__)
211 #define DRM_WARN_ONCE(fmt, ...) \
212 _DRM_PRINTK(_once, WARNING, fmt, ##__VA_ARGS__)
217 * @dev: device pointer
218 * @fmt: printf() like format string.
220 #define DRM_DEV_ERROR(dev, fmt, ...) \
221 drm_dev_printk(dev, KERN_ERR, DRM_UT_NONE, __func__, " *ERROR*",\
223 #define DRM_ERROR(fmt, ...) \
224 drm_printk(KERN_ERR, DRM_UT_NONE, fmt, ##__VA_ARGS__)
227 * Rate limited error output. Like DRM_ERROR() but won't flood the log.
229 * @dev: device pointer
230 * @fmt: printf() like format string.
232 #define DRM_DEV_ERROR_RATELIMITED(dev, fmt, ...) \
234 static DEFINE_RATELIMIT_STATE(_rs, \
235 DEFAULT_RATELIMIT_INTERVAL, \
236 DEFAULT_RATELIMIT_BURST); \
238 if (__ratelimit(&_rs)) \
239 DRM_DEV_ERROR(dev, fmt, ##__VA_ARGS__); \
241 #define DRM_ERROR_RATELIMITED(fmt, ...) \
242 DRM_DEV_ERROR_RATELIMITED(NULL, fmt, ##__VA_ARGS__)
244 #define DRM_DEV_INFO(dev, fmt, ...) \
245 drm_dev_printk(dev, KERN_INFO, DRM_UT_NONE, __func__, "", fmt, \
248 #define DRM_DEV_INFO_ONCE(dev, fmt, ...) \
250 static bool __print_once __read_mostly; \
251 if (!__print_once) { \
252 __print_once = true; \
253 DRM_DEV_INFO(dev, fmt, ##__VA_ARGS__); \
260 * @dev: device pointer
261 * @fmt: printf() like format string.
263 #define DRM_DEV_DEBUG(dev, fmt, args...) \
264 drm_dev_printk(dev, KERN_DEBUG, DRM_UT_CORE, __func__, "", fmt, \
266 #define DRM_DEBUG(fmt, ...) \
267 drm_printk(KERN_DEBUG, DRM_UT_CORE, fmt, ##__VA_ARGS__)
269 #define DRM_DEV_DEBUG_DRIVER(dev, fmt, args...) \
270 drm_dev_printk(dev, KERN_DEBUG, DRM_UT_DRIVER, __func__, "", \
272 #define DRM_DEBUG_DRIVER(fmt, ...) \
273 drm_printk(KERN_DEBUG, DRM_UT_DRIVER, fmt, ##__VA_ARGS__)
275 #define DRM_DEV_DEBUG_KMS(dev, fmt, args...) \
276 drm_dev_printk(dev, KERN_DEBUG, DRM_UT_KMS, __func__, "", fmt, \
278 #define DRM_DEBUG_KMS(fmt, ...) \
279 drm_printk(KERN_DEBUG, DRM_UT_KMS, fmt, ##__VA_ARGS__)
281 #define DRM_DEV_DEBUG_PRIME(dev, fmt, args...) \
282 drm_dev_printk(dev, KERN_DEBUG, DRM_UT_PRIME, __func__, "", \
284 #define DRM_DEBUG_PRIME(fmt, ...) \
285 drm_printk(KERN_DEBUG, DRM_UT_PRIME, fmt, ##__VA_ARGS__)
287 #define DRM_DEV_DEBUG_ATOMIC(dev, fmt, args...) \
288 drm_dev_printk(dev, KERN_DEBUG, DRM_UT_ATOMIC, __func__, "", \
290 #define DRM_DEBUG_ATOMIC(fmt, ...) \
291 drm_printk(KERN_DEBUG, DRM_UT_ATOMIC, fmt, ##__VA_ARGS__)
293 #define DRM_DEV_DEBUG_VBL(dev, fmt, args...) \
294 drm_dev_printk(dev, KERN_DEBUG, DRM_UT_VBL, __func__, "", fmt, \
296 #define DRM_DEBUG_VBL(fmt, ...) \
297 drm_printk(KERN_DEBUG, DRM_UT_VBL, fmt, ##__VA_ARGS__)
299 #define DRM_DEBUG_LEASE(fmt, ...) \
300 drm_printk(KERN_DEBUG, DRM_UT_LEASE, fmt, ##__VA_ARGS__)
302 #define _DRM_DEV_DEFINE_DEBUG_RATELIMITED(dev, level, fmt, args...) \
304 static DEFINE_RATELIMIT_STATE(_rs, \
305 DEFAULT_RATELIMIT_INTERVAL, \
306 DEFAULT_RATELIMIT_BURST); \
307 if (__ratelimit(&_rs)) \
308 drm_dev_printk(dev, KERN_DEBUG, DRM_UT_ ## level, \
309 __func__, "", fmt, ##args); \
313 * Rate limited debug output. Like DRM_DEBUG() but won't flood the log.
315 * @dev: device pointer
316 * @fmt: printf() like format string.
318 #define DRM_DEV_DEBUG_RATELIMITED(dev, fmt, args...) \
319 DEV__DRM_DEFINE_DEBUG_RATELIMITED(dev, CORE, fmt, ##args)
320 #define DRM_DEBUG_RATELIMITED(fmt, args...) \
321 DRM_DEV_DEBUG_RATELIMITED(NULL, fmt, ##args)
322 #define DRM_DEV_DEBUG_DRIVER_RATELIMITED(dev, fmt, args...) \
323 _DRM_DEV_DEFINE_DEBUG_RATELIMITED(dev, DRIVER, fmt, ##args)
324 #define DRM_DEBUG_DRIVER_RATELIMITED(fmt, args...) \
325 DRM_DEV_DEBUG_DRIVER_RATELIMITED(NULL, fmt, ##args)
326 #define DRM_DEV_DEBUG_KMS_RATELIMITED(dev, fmt, args...) \
327 _DRM_DEV_DEFINE_DEBUG_RATELIMITED(dev, KMS, fmt, ##args)
328 #define DRM_DEBUG_KMS_RATELIMITED(fmt, args...) \
329 DRM_DEV_DEBUG_KMS_RATELIMITED(NULL, fmt, ##args)
330 #define DRM_DEV_DEBUG_PRIME_RATELIMITED(dev, fmt, args...) \
331 _DRM_DEV_DEFINE_DEBUG_RATELIMITED(dev, PRIME, fmt, ##args)
332 #define DRM_DEBUG_PRIME_RATELIMITED(fmt, args...) \
333 DRM_DEV_DEBUG_PRIME_RATELIMITED(NULL, fmt, ##args)
335 #endif /* DRM_PRINT_H_ */