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>
33 #include <linux/debugfs.h>
37 /* Do *not* use outside of drm_print.[ch]! */
38 extern unsigned int __drm_debug;
43 * A simple wrapper for dev_printk(), seq_printf(), etc. Allows same
44 * debug code to be used for both debugfs and printk logging.
48 * void log_some_info(struct drm_printer *p)
50 * drm_printf(p, "foo=%d\n", foo);
51 * drm_printf(p, "bar=%d\n", bar);
54 * #ifdef CONFIG_DEBUG_FS
55 * void debugfs_show(struct seq_file *f)
57 * struct drm_printer p = drm_seq_file_printer(f);
62 * void some_other_function(...)
64 * struct drm_printer p = drm_info_printer(drm->dev);
70 * struct drm_printer - drm output "stream"
72 * Do not use struct members directly. Use drm_printer_seq_file(),
73 * drm_printer_info(), etc to initialize. And drm_printf() for output.
77 void (*printfn)(struct drm_printer *p, struct va_format *vaf);
78 void (*puts)(struct drm_printer *p, const char *str);
83 void __drm_printfn_coredump(struct drm_printer *p, struct va_format *vaf);
84 void __drm_puts_coredump(struct drm_printer *p, const char *str);
85 void __drm_printfn_seq_file(struct drm_printer *p, struct va_format *vaf);
86 void __drm_puts_seq_file(struct drm_printer *p, const char *str);
87 void __drm_printfn_info(struct drm_printer *p, struct va_format *vaf);
88 void __drm_printfn_debug(struct drm_printer *p, struct va_format *vaf);
89 void __drm_printfn_err(struct drm_printer *p, struct va_format *vaf);
92 void drm_printf(struct drm_printer *p, const char *f, ...);
93 void drm_puts(struct drm_printer *p, const char *str);
94 void drm_print_regset32(struct drm_printer *p, struct debugfs_regset32 *regset);
95 void drm_print_bits(struct drm_printer *p, unsigned long value,
96 const char * const bits[], unsigned int nbits);
100 * drm_vprintf - print to a &drm_printer stream
101 * @p: the &drm_printer
102 * @fmt: format string
106 drm_vprintf(struct drm_printer *p, const char *fmt, va_list *va)
108 struct va_format vaf = { .fmt = fmt, .va = va };
114 * drm_printf_indent - Print to a &drm_printer stream with indentation
115 * @printer: DRM printer
116 * @indent: Tab indentation level (max 5)
117 * @fmt: Format string
119 #define drm_printf_indent(printer, indent, fmt, ...) \
120 drm_printf((printer), "%.*s" fmt, (indent), "\t\t\t\t\tX", ##__VA_ARGS__)
123 * struct drm_print_iterator - local struct used with drm_printer_coredump
124 * @data: Pointer to the devcoredump output buffer
125 * @start: The offset within the buffer to start writing
126 * @remain: The number of bytes to write for this iteration
128 struct drm_print_iterator {
137 * drm_coredump_printer - construct a &drm_printer that can output to a buffer
138 * from the read function for devcoredump
139 * @iter: A pointer to a struct drm_print_iterator for the read instance
141 * This wrapper extends drm_printf() to work with a dev_coredumpm() callback
142 * function. The passed in drm_print_iterator struct contains the buffer
143 * pointer, size and offset as passed in from devcoredump.
147 * void coredump_read(char *buffer, loff_t offset, size_t count,
148 * void *data, size_t datalen)
150 * struct drm_print_iterator iter;
151 * struct drm_printer p;
153 * iter.data = buffer;
154 * iter.start = offset;
155 * iter.remain = count;
157 * p = drm_coredump_printer(&iter);
159 * drm_printf(p, "foo=%d\n", foo);
162 * void makecoredump(...)
165 * dev_coredumpm(dev, THIS_MODULE, data, 0, GFP_KERNEL,
166 * coredump_read, ...)
170 * The &drm_printer object
172 static inline struct drm_printer
173 drm_coredump_printer(struct drm_print_iterator *iter)
175 struct drm_printer p = {
176 .printfn = __drm_printfn_coredump,
177 .puts = __drm_puts_coredump,
181 /* Set the internal offset of the iterator to zero */
188 * drm_seq_file_printer - construct a &drm_printer that outputs to &seq_file
189 * @f: the &struct seq_file to output to
192 * The &drm_printer object
194 static inline struct drm_printer drm_seq_file_printer(struct seq_file *f)
196 struct drm_printer p = {
197 .printfn = __drm_printfn_seq_file,
198 .puts = __drm_puts_seq_file,
205 * drm_info_printer - construct a &drm_printer that outputs to dev_printk()
206 * @dev: the &struct device pointer
209 * The &drm_printer object
211 static inline struct drm_printer drm_info_printer(struct device *dev)
213 struct drm_printer p = {
214 .printfn = __drm_printfn_info,
221 * drm_debug_printer - construct a &drm_printer that outputs to pr_debug()
222 * @prefix: debug output prefix
225 * The &drm_printer object
227 static inline struct drm_printer drm_debug_printer(const char *prefix)
229 struct drm_printer p = {
230 .printfn = __drm_printfn_debug,
237 * drm_err_printer - construct a &drm_printer that outputs to pr_err()
238 * @prefix: debug output prefix
241 * The &drm_printer object
243 static inline struct drm_printer drm_err_printer(const char *prefix)
245 struct drm_printer p = {
246 .printfn = __drm_printfn_err,
253 * enum drm_debug_category - The DRM debug categories
255 * Each of the DRM debug logging macros use a specific category, and the logging
256 * is filtered by the drm.debug module parameter. This enum specifies the values
259 * Each DRM_DEBUG_<CATEGORY> macro logs to DRM_UT_<CATEGORY> category, except
260 * DRM_DEBUG() logs to DRM_UT_CORE.
262 * Enabling verbose debug messages is done through the drm.debug parameter, each
263 * category being enabled by a bit:
265 * - drm.debug=0x1 will enable CORE messages
266 * - drm.debug=0x2 will enable DRIVER messages
267 * - drm.debug=0x3 will enable CORE and DRIVER messages
269 * - drm.debug=0x1ff will enable all messages
271 * An interesting feature is that it's possible to enable verbose logging at
272 * run-time by echoing the debug value in its sysfs node::
274 * # echo 0xf > /sys/module/drm/parameters/debug
277 enum drm_debug_category {
279 * @DRM_UT_CORE: Used in the generic drm code: drm_ioctl.c, drm_mm.c,
284 * @DRM_UT_DRIVER: Used in the vendor specific part of the driver: i915,
287 DRM_UT_DRIVER = 0x02,
289 * @DRM_UT_KMS: Used in the modesetting code.
293 * @DRM_UT_PRIME: Used in the prime code.
297 * @DRM_UT_ATOMIC: Used in the atomic code.
299 DRM_UT_ATOMIC = 0x10,
301 * @DRM_UT_VBL: Used for verbose debug message in the vblank code.
305 * @DRM_UT_STATE: Used for verbose atomic state debugging.
309 * @DRM_UT_LEASE: Used in the lease code.
313 * @DRM_UT_DP: Used in the DP code.
317 * @DRM_UT_DRMRES: Used in the drm managed resources code.
319 DRM_UT_DRMRES = 0x200,
322 static inline bool drm_debug_enabled(enum drm_debug_category category)
324 return unlikely(__drm_debug & category);
328 * struct device based logging
330 * Prefer drm_device based logging over device or printk based logging.
334 void drm_dev_printk(const struct device *dev, const char *level,
335 const char *format, ...);
337 void drm_dev_dbg(const struct device *dev, enum drm_debug_category category,
338 const char *format, ...);
341 * DRM_DEV_ERROR() - Error output.
343 * NOTE: this is deprecated in favor of drm_err() or dev_err().
345 * @dev: device pointer
346 * @fmt: printf() like format string.
348 #define DRM_DEV_ERROR(dev, fmt, ...) \
349 drm_dev_printk(dev, KERN_ERR, "*ERROR* " fmt, ##__VA_ARGS__)
352 * DRM_DEV_ERROR_RATELIMITED() - Rate limited error output.
354 * NOTE: this is deprecated in favor of drm_err_ratelimited() or
355 * dev_err_ratelimited().
357 * @dev: device pointer
358 * @fmt: printf() like format string.
360 * Like DRM_ERROR() but won't flood the log.
362 #define DRM_DEV_ERROR_RATELIMITED(dev, fmt, ...) \
364 static DEFINE_RATELIMIT_STATE(_rs, \
365 DEFAULT_RATELIMIT_INTERVAL, \
366 DEFAULT_RATELIMIT_BURST); \
368 if (__ratelimit(&_rs)) \
369 DRM_DEV_ERROR(dev, fmt, ##__VA_ARGS__); \
372 /* NOTE: this is deprecated in favor of drm_info() or dev_info(). */
373 #define DRM_DEV_INFO(dev, fmt, ...) \
374 drm_dev_printk(dev, KERN_INFO, fmt, ##__VA_ARGS__)
376 /* NOTE: this is deprecated in favor of drm_info_once() or dev_info_once(). */
377 #define DRM_DEV_INFO_ONCE(dev, fmt, ...) \
379 static bool __print_once __read_mostly; \
380 if (!__print_once) { \
381 __print_once = true; \
382 DRM_DEV_INFO(dev, fmt, ##__VA_ARGS__); \
387 * DRM_DEV_DEBUG() - Debug output for generic drm code
389 * NOTE: this is deprecated in favor of drm_dbg_core().
391 * @dev: device pointer
392 * @fmt: printf() like format string.
394 #define DRM_DEV_DEBUG(dev, fmt, ...) \
395 drm_dev_dbg(dev, DRM_UT_CORE, fmt, ##__VA_ARGS__)
397 * DRM_DEV_DEBUG_DRIVER() - Debug output for vendor specific part of the driver
399 * NOTE: this is deprecated in favor of drm_dbg() or dev_dbg().
401 * @dev: device pointer
402 * @fmt: printf() like format string.
404 #define DRM_DEV_DEBUG_DRIVER(dev, fmt, ...) \
405 drm_dev_dbg(dev, DRM_UT_DRIVER, fmt, ##__VA_ARGS__)
407 * DRM_DEV_DEBUG_KMS() - Debug output for modesetting code
409 * NOTE: this is deprecated in favor of drm_dbg_kms().
411 * @dev: device pointer
412 * @fmt: printf() like format string.
414 #define DRM_DEV_DEBUG_KMS(dev, fmt, ...) \
415 drm_dev_dbg(dev, DRM_UT_KMS, fmt, ##__VA_ARGS__)
418 * struct drm_device based logging
420 * Prefer drm_device based logging over device or prink based logging.
423 /* Helper for struct drm_device based logging. */
424 #define __drm_printk(drm, level, type, fmt, ...) \
425 dev_##level##type((drm)->dev, "[drm] " fmt, ##__VA_ARGS__)
428 #define drm_info(drm, fmt, ...) \
429 __drm_printk((drm), info,, fmt, ##__VA_ARGS__)
431 #define drm_notice(drm, fmt, ...) \
432 __drm_printk((drm), notice,, fmt, ##__VA_ARGS__)
434 #define drm_warn(drm, fmt, ...) \
435 __drm_printk((drm), warn,, fmt, ##__VA_ARGS__)
437 #define drm_err(drm, fmt, ...) \
438 __drm_printk((drm), err,, "*ERROR* " fmt, ##__VA_ARGS__)
441 #define drm_info_once(drm, fmt, ...) \
442 __drm_printk((drm), info, _once, fmt, ##__VA_ARGS__)
444 #define drm_notice_once(drm, fmt, ...) \
445 __drm_printk((drm), notice, _once, fmt, ##__VA_ARGS__)
447 #define drm_warn_once(drm, fmt, ...) \
448 __drm_printk((drm), warn, _once, fmt, ##__VA_ARGS__)
450 #define drm_err_once(drm, fmt, ...) \
451 __drm_printk((drm), err, _once, "*ERROR* " fmt, ##__VA_ARGS__)
454 #define drm_err_ratelimited(drm, fmt, ...) \
455 __drm_printk((drm), err, _ratelimited, "*ERROR* " fmt, ##__VA_ARGS__)
458 #define drm_dbg_core(drm, fmt, ...) \
459 drm_dev_dbg((drm) ? (drm)->dev : NULL, DRM_UT_CORE, fmt, ##__VA_ARGS__)
460 #define drm_dbg(drm, fmt, ...) \
461 drm_dev_dbg((drm) ? (drm)->dev : NULL, DRM_UT_DRIVER, fmt, ##__VA_ARGS__)
462 #define drm_dbg_kms(drm, fmt, ...) \
463 drm_dev_dbg((drm) ? (drm)->dev : NULL, DRM_UT_KMS, fmt, ##__VA_ARGS__)
464 #define drm_dbg_prime(drm, fmt, ...) \
465 drm_dev_dbg((drm) ? (drm)->dev : NULL, DRM_UT_PRIME, fmt, ##__VA_ARGS__)
466 #define drm_dbg_atomic(drm, fmt, ...) \
467 drm_dev_dbg((drm) ? (drm)->dev : NULL, DRM_UT_ATOMIC, fmt, ##__VA_ARGS__)
468 #define drm_dbg_vbl(drm, fmt, ...) \
469 drm_dev_dbg((drm) ? (drm)->dev : NULL, DRM_UT_VBL, fmt, ##__VA_ARGS__)
470 #define drm_dbg_state(drm, fmt, ...) \
471 drm_dev_dbg((drm) ? (drm)->dev : NULL, DRM_UT_STATE, fmt, ##__VA_ARGS__)
472 #define drm_dbg_lease(drm, fmt, ...) \
473 drm_dev_dbg((drm) ? (drm)->dev : NULL, DRM_UT_LEASE, fmt, ##__VA_ARGS__)
474 #define drm_dbg_dp(drm, fmt, ...) \
475 drm_dev_dbg((drm) ? (drm)->dev : NULL, DRM_UT_DP, fmt, ##__VA_ARGS__)
476 #define drm_dbg_drmres(drm, fmt, ...) \
477 drm_dev_dbg((drm) ? (drm)->dev : NULL, DRM_UT_DRMRES, fmt, ##__VA_ARGS__)
481 * printk based logging
483 * Prefer drm_device based logging over device or prink based logging.
487 void __drm_dbg(enum drm_debug_category category, const char *format, ...);
489 void __drm_err(const char *format, ...);
491 /* Macros to make printk easier */
493 #define _DRM_PRINTK(once, level, fmt, ...) \
494 printk##once(KERN_##level "[" DRM_NAME "] " fmt, ##__VA_ARGS__)
496 /* NOTE: this is deprecated in favor of pr_info(). */
497 #define DRM_INFO(fmt, ...) \
498 _DRM_PRINTK(, INFO, fmt, ##__VA_ARGS__)
499 /* NOTE: this is deprecated in favor of pr_notice(). */
500 #define DRM_NOTE(fmt, ...) \
501 _DRM_PRINTK(, NOTICE, fmt, ##__VA_ARGS__)
502 /* NOTE: this is deprecated in favor of pr_warn(). */
503 #define DRM_WARN(fmt, ...) \
504 _DRM_PRINTK(, WARNING, fmt, ##__VA_ARGS__)
506 /* NOTE: this is deprecated in favor of pr_info_once(). */
507 #define DRM_INFO_ONCE(fmt, ...) \
508 _DRM_PRINTK(_once, INFO, fmt, ##__VA_ARGS__)
509 /* NOTE: this is deprecated in favor of pr_notice_once(). */
510 #define DRM_NOTE_ONCE(fmt, ...) \
511 _DRM_PRINTK(_once, NOTICE, fmt, ##__VA_ARGS__)
512 /* NOTE: this is deprecated in favor of pr_warn_once(). */
513 #define DRM_WARN_ONCE(fmt, ...) \
514 _DRM_PRINTK(_once, WARNING, fmt, ##__VA_ARGS__)
516 /* NOTE: this is deprecated in favor of pr_err(). */
517 #define DRM_ERROR(fmt, ...) \
518 __drm_err(fmt, ##__VA_ARGS__)
520 /* NOTE: this is deprecated in favor of pr_err_ratelimited(). */
521 #define DRM_ERROR_RATELIMITED(fmt, ...) \
522 DRM_DEV_ERROR_RATELIMITED(NULL, fmt, ##__VA_ARGS__)
524 /* NOTE: this is deprecated in favor of drm_dbg_core(NULL, ...). */
525 #define DRM_DEBUG(fmt, ...) \
526 __drm_dbg(DRM_UT_CORE, fmt, ##__VA_ARGS__)
528 /* NOTE: this is deprecated in favor of drm_dbg(NULL, ...). */
529 #define DRM_DEBUG_DRIVER(fmt, ...) \
530 __drm_dbg(DRM_UT_DRIVER, fmt, ##__VA_ARGS__)
532 /* NOTE: this is deprecated in favor of drm_dbg_kms(NULL, ...). */
533 #define DRM_DEBUG_KMS(fmt, ...) \
534 __drm_dbg(DRM_UT_KMS, fmt, ##__VA_ARGS__)
536 /* NOTE: this is deprecated in favor of drm_dbg_prime(NULL, ...). */
537 #define DRM_DEBUG_PRIME(fmt, ...) \
538 __drm_dbg(DRM_UT_PRIME, fmt, ##__VA_ARGS__)
540 /* NOTE: this is deprecated in favor of drm_dbg_atomic(NULL, ...). */
541 #define DRM_DEBUG_ATOMIC(fmt, ...) \
542 __drm_dbg(DRM_UT_ATOMIC, fmt, ##__VA_ARGS__)
544 /* NOTE: this is deprecated in favor of drm_dbg_vbl(NULL, ...). */
545 #define DRM_DEBUG_VBL(fmt, ...) \
546 __drm_dbg(DRM_UT_VBL, fmt, ##__VA_ARGS__)
548 /* NOTE: this is deprecated in favor of drm_dbg_lease(NULL, ...). */
549 #define DRM_DEBUG_LEASE(fmt, ...) \
550 __drm_dbg(DRM_UT_LEASE, fmt, ##__VA_ARGS__)
552 /* NOTE: this is deprecated in favor of drm_dbg_dp(NULL, ...). */
553 #define DRM_DEBUG_DP(fmt, ...) \
554 __drm_dbg(DRM_UT_DP, fmt, ## __VA_ARGS__)
556 #define __DRM_DEFINE_DBG_RATELIMITED(category, drm, fmt, ...) \
558 static DEFINE_RATELIMIT_STATE(rs_, DEFAULT_RATELIMIT_INTERVAL, DEFAULT_RATELIMIT_BURST);\
559 const struct drm_device *drm_ = (drm); \
561 if (drm_debug_enabled(DRM_UT_ ## category) && __ratelimit(&rs_)) \
562 drm_dev_printk(drm_ ? drm_->dev : NULL, KERN_DEBUG, fmt, ## __VA_ARGS__); \
565 #define drm_dbg_kms_ratelimited(drm, fmt, ...) \
566 __DRM_DEFINE_DBG_RATELIMITED(KMS, drm, fmt, ## __VA_ARGS__)
568 /* NOTE: this is deprecated in favor of drm_dbg_kms_ratelimited(NULL, ...). */
569 #define DRM_DEBUG_KMS_RATELIMITED(fmt, ...) drm_dbg_kms_ratelimited(NULL, fmt, ## __VA_ARGS__)
572 * struct drm_device based WARNs
574 * drm_WARN*() acts like WARN*(), but with the key difference of
575 * using device specific information so that we know from which device
576 * warning is originating from.
578 * Prefer drm_device based drm_WARN* over regular WARN*
581 /* Helper for struct drm_device based WARNs */
582 #define drm_WARN(drm, condition, format, arg...) \
583 WARN(condition, "%s %s: " format, \
584 dev_driver_string((drm)->dev), \
585 dev_name((drm)->dev), ## arg)
587 #define drm_WARN_ONCE(drm, condition, format, arg...) \
588 WARN_ONCE(condition, "%s %s: " format, \
589 dev_driver_string((drm)->dev), \
590 dev_name((drm)->dev), ## arg)
592 #define drm_WARN_ON(drm, x) \
593 drm_WARN((drm), (x), "%s", \
594 "drm_WARN_ON(" __stringify(x) ")")
596 #define drm_WARN_ON_ONCE(drm, x) \
597 drm_WARN_ONCE((drm), (x), "%s", \
598 "drm_WARN_ON_ONCE(" __stringify(x) ")")
600 #endif /* DRM_PRINT_H_ */