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.
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, ...);
85 * drm_vprintf - print to a &drm_printer stream
86 * @p: the &drm_printer
91 drm_vprintf(struct drm_printer *p, const char *fmt, va_list *va)
93 struct va_format vaf = { .fmt = fmt, .va = va };
99 * drm_printf_indent - Print to a &drm_printer stream with indentation
100 * @printer: DRM printer
101 * @indent: Tab indentation level (max 5)
102 * @fmt: Format string
104 #define drm_printf_indent(printer, indent, fmt, ...) \
105 drm_printf((printer), "%.*s" fmt, (indent), "\t\t\t\t\tX", ##__VA_ARGS__)
108 * drm_seq_file_printer - construct a &drm_printer that outputs to &seq_file
109 * @f: the &struct seq_file to output to
112 * The &drm_printer object
114 static inline struct drm_printer drm_seq_file_printer(struct seq_file *f)
116 struct drm_printer p = {
117 .printfn = __drm_printfn_seq_file,
124 * drm_info_printer - construct a &drm_printer that outputs to dev_printk()
125 * @dev: the &struct device pointer
128 * The &drm_printer object
130 static inline struct drm_printer drm_info_printer(struct device *dev)
132 struct drm_printer p = {
133 .printfn = __drm_printfn_info,
140 * drm_debug_printer - construct a &drm_printer that outputs to pr_debug()
141 * @prefix: debug output prefix
144 * The &drm_printer object
146 static inline struct drm_printer drm_debug_printer(const char *prefix)
148 struct drm_printer p = {
149 .printfn = __drm_printfn_debug,
156 * The following categories are defined:
158 * CORE: Used in the generic drm code: drm_ioctl.c, drm_mm.c, drm_memory.c, ...
159 * This is the category used by the DRM_DEBUG() macro.
161 * DRIVER: Used in the vendor specific part of the driver: i915, radeon, ...
162 * This is the category used by the DRM_DEBUG_DRIVER() macro.
164 * KMS: used in the modesetting code.
165 * This is the category used by the DRM_DEBUG_KMS() macro.
167 * PRIME: used in the prime code.
168 * This is the category used by the DRM_DEBUG_PRIME() macro.
170 * ATOMIC: used in the atomic code.
171 * This is the category used by the DRM_DEBUG_ATOMIC() macro.
173 * VBL: used for verbose debug message in the vblank code
174 * This is the category used by the DRM_DEBUG_VBL() macro.
176 * Enabling verbose debug messages is done through the drm.debug parameter,
177 * each category being enabled by a bit.
179 * drm.debug=0x1 will enable CORE messages
180 * drm.debug=0x2 will enable DRIVER messages
181 * drm.debug=0x3 will enable CORE and DRIVER messages
183 * drm.debug=0x3f will enable all messages
185 * An interesting feature is that it's possible to enable verbose logging at
186 * run-time by echoing the debug value in its sysfs node:
187 * # echo 0xf > /sys/module/drm/parameters/debug
189 #define DRM_UT_NONE 0x00
190 #define DRM_UT_CORE 0x01
191 #define DRM_UT_DRIVER 0x02
192 #define DRM_UT_KMS 0x04
193 #define DRM_UT_PRIME 0x08
194 #define DRM_UT_ATOMIC 0x10
195 #define DRM_UT_VBL 0x20
196 #define DRM_UT_STATE 0x40
197 #define DRM_UT_LEASE 0x80
200 void drm_dev_printk(const struct device *dev, const char *level,
201 const char *format, ...);
203 void drm_dev_dbg(const struct device *dev, unsigned int category,
204 const char *format, ...);
207 void drm_dbg(unsigned int category, const char *format, ...);
209 void drm_err(const char *format, ...);
211 /* Macros to make printk easier */
213 #define _DRM_PRINTK(once, level, fmt, ...) \
214 printk##once(KERN_##level "[" DRM_NAME "] " fmt, ##__VA_ARGS__)
216 #define DRM_INFO(fmt, ...) \
217 _DRM_PRINTK(, INFO, fmt, ##__VA_ARGS__)
218 #define DRM_NOTE(fmt, ...) \
219 _DRM_PRINTK(, NOTICE, fmt, ##__VA_ARGS__)
220 #define DRM_WARN(fmt, ...) \
221 _DRM_PRINTK(, WARNING, fmt, ##__VA_ARGS__)
223 #define DRM_INFO_ONCE(fmt, ...) \
224 _DRM_PRINTK(_once, INFO, fmt, ##__VA_ARGS__)
225 #define DRM_NOTE_ONCE(fmt, ...) \
226 _DRM_PRINTK(_once, NOTICE, fmt, ##__VA_ARGS__)
227 #define DRM_WARN_ONCE(fmt, ...) \
228 _DRM_PRINTK(_once, WARNING, fmt, ##__VA_ARGS__)
233 * @dev: device pointer
234 * @fmt: printf() like format string.
236 #define DRM_DEV_ERROR(dev, fmt, ...) \
237 drm_dev_printk(dev, KERN_ERR, "*ERROR* " fmt, ##__VA_ARGS__)
238 #define DRM_ERROR(fmt, ...) \
239 drm_err(fmt, ##__VA_ARGS__)
242 * Rate limited error output. Like DRM_ERROR() but won't flood the log.
244 * @dev: device pointer
245 * @fmt: printf() like format string.
247 #define DRM_DEV_ERROR_RATELIMITED(dev, fmt, ...) \
249 static DEFINE_RATELIMIT_STATE(_rs, \
250 DEFAULT_RATELIMIT_INTERVAL, \
251 DEFAULT_RATELIMIT_BURST); \
253 if (__ratelimit(&_rs)) \
254 DRM_DEV_ERROR(dev, fmt, ##__VA_ARGS__); \
256 #define DRM_ERROR_RATELIMITED(fmt, ...) \
257 DRM_DEV_ERROR_RATELIMITED(NULL, fmt, ##__VA_ARGS__)
259 #define DRM_DEV_INFO(dev, fmt, ...) \
260 drm_dev_printk(dev, KERN_INFO, fmt, ##__VA_ARGS__)
262 #define DRM_DEV_INFO_ONCE(dev, fmt, ...) \
264 static bool __print_once __read_mostly; \
265 if (!__print_once) { \
266 __print_once = true; \
267 DRM_DEV_INFO(dev, fmt, ##__VA_ARGS__); \
274 * @dev: device pointer
275 * @fmt: printf() like format string.
277 #define DRM_DEV_DEBUG(dev, fmt, ...) \
278 drm_dev_dbg(dev, DRM_UT_CORE, fmt, ##__VA_ARGS__)
279 #define DRM_DEBUG(fmt, ...) \
280 drm_dbg(DRM_UT_CORE, fmt, ##__VA_ARGS__)
282 #define DRM_DEV_DEBUG_DRIVER(dev, fmt, ...) \
283 drm_dev_dbg(dev, DRM_UT_DRIVER, fmt, ##__VA_ARGS__)
284 #define DRM_DEBUG_DRIVER(fmt, ...) \
285 drm_dbg(DRM_UT_DRIVER, fmt, ##__VA_ARGS__)
287 #define DRM_DEV_DEBUG_KMS(dev, fmt, ...) \
288 drm_dev_dbg(dev, DRM_UT_KMS, fmt, ##__VA_ARGS__)
289 #define DRM_DEBUG_KMS(fmt, ...) \
290 drm_dbg(DRM_UT_KMS, fmt, ##__VA_ARGS__)
292 #define DRM_DEV_DEBUG_PRIME(dev, fmt, ...) \
293 drm_dev_dbg(dev, DRM_UT_PRIME, fmt, ##__VA_ARGS__)
294 #define DRM_DEBUG_PRIME(fmt, ...) \
295 drm_dbg(DRM_UT_PRIME, fmt, ##__VA_ARGS__)
297 #define DRM_DEV_DEBUG_ATOMIC(dev, fmt, ...) \
298 drm_dev_dbg(dev, DRM_UT_ATOMIC, fmt, ##__VA_ARGS__)
299 #define DRM_DEBUG_ATOMIC(fmt, ...) \
300 drm_dbg(DRM_UT_ATOMIC, fmt, ##__VA_ARGS__)
302 #define DRM_DEV_DEBUG_VBL(dev, fmt, ...) \
303 drm_dev_dbg(dev, DRM_UT_VBL, fmt, ##__VA_ARGS__)
304 #define DRM_DEBUG_VBL(fmt, ...) \
305 drm_dbg(DRM_UT_VBL, fmt, ##__VA_ARGS__)
307 #define DRM_DEBUG_LEASE(fmt, ...) \
308 drm_dbg(DRM_UT_LEASE, fmt, ##__VA_ARGS__)
310 #define _DRM_DEV_DEFINE_DEBUG_RATELIMITED(dev, category, fmt, ...) \
312 static DEFINE_RATELIMIT_STATE(_rs, \
313 DEFAULT_RATELIMIT_INTERVAL, \
314 DEFAULT_RATELIMIT_BURST); \
315 if (__ratelimit(&_rs)) \
316 drm_dev_dbg(dev, category, fmt, ##__VA_ARGS__); \
320 * Rate limited debug output. Like DRM_DEBUG() but won't flood the log.
322 * @dev: device pointer
323 * @fmt: printf() like format string.
325 #define DRM_DEV_DEBUG_RATELIMITED(dev, fmt, ...) \
326 _DEV_DRM_DEFINE_DEBUG_RATELIMITED(dev, DRM_UT_CORE, \
328 #define DRM_DEBUG_RATELIMITED(fmt, ...) \
329 DRM_DEV_DEBUG_RATELIMITED(NULL, fmt, ##__VA_ARGS__)
331 #define DRM_DEV_DEBUG_DRIVER_RATELIMITED(dev, fmt, ...) \
332 _DRM_DEV_DEFINE_DEBUG_RATELIMITED(dev, DRM_UT_DRIVER, \
334 #define DRM_DEBUG_DRIVER_RATELIMITED(fmt, ...) \
335 DRM_DEV_DEBUG_DRIVER_RATELIMITED(NULL, fmt, ##__VA_ARGS__)
337 #define DRM_DEV_DEBUG_KMS_RATELIMITED(dev, fmt, ...) \
338 _DRM_DEV_DEFINE_DEBUG_RATELIMITED(dev, DRM_UT_KMS, \
340 #define DRM_DEBUG_KMS_RATELIMITED(fmt, ...) \
341 DRM_DEV_DEBUG_KMS_RATELIMITED(NULL, fmt, ##__VA_ARGS__)
343 #define DRM_DEV_DEBUG_PRIME_RATELIMITED(dev, fmt, ...) \
344 _DRM_DEV_DEFINE_DEBUG_RATELIMITED(dev, DRM_UT_PRIME, \
346 #define DRM_DEBUG_PRIME_RATELIMITED(fmt, ...) \
347 DRM_DEV_DEBUG_PRIME_RATELIMITED(NULL, fmt, ##__VA_ARGS__)
349 #endif /* DRM_PRINT_H_ */