summaryrefslogtreecommitdiff
path: root/include/drm/drm_print.h
blob: f32d179e139d9cdd45621436fe866d5332bd510d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
/*
 * Copyright (C) 2016 Red Hat
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Authors:
 * Rob Clark <robdclark@gmail.com>
 */

#ifndef DRM_PRINT_H_
#define DRM_PRINT_H_

#include <linux/compiler.h>
#include <linux/printk.h>
#include <linux/seq_file.h>
#include <linux/device.h>
#include <linux/debugfs.h>

#include <drm/drm.h>

/* Do *not* use outside of drm_print.[ch]! */
extern unsigned int __drm_debug;

/**
 * DOC: print
 *
 * A simple wrapper for dev_printk(), seq_printf(), etc.  Allows same
 * debug code to be used for both debugfs and printk logging.
 *
 * For example::
 *
 *     void log_some_info(struct drm_printer *p)
 *     {
 *             drm_printf(p, "foo=%d\n", foo);
 *             drm_printf(p, "bar=%d\n", bar);
 *     }
 *
 *     #ifdef CONFIG_DEBUG_FS
 *     void debugfs_show(struct seq_file *f)
 *     {
 *             struct drm_printer p = drm_seq_file_printer(f);
 *             log_some_info(&p);
 *     }
 *     #endif
 *
 *     void some_other_function(...)
 *     {
 *             struct drm_printer p = drm_info_printer(drm->dev);
 *             log_some_info(&p);
 *     }
 */

/**
 * struct drm_printer - drm output "stream"
 *
 * Do not use struct members directly.  Use drm_printer_seq_file(),
 * drm_printer_info(), etc to initialize.  And drm_printf() for output.
 */
struct drm_printer {
	/* private: */
	void (*printfn)(struct drm_printer *p, struct va_format *vaf);
	void (*puts)(struct drm_printer *p, const char *str);
	void *arg;
	const char *prefix;
};

void __drm_printfn_coredump(struct drm_printer *p, struct va_format *vaf);
void __drm_puts_coredump(struct drm_printer *p, const char *str);
void __drm_printfn_seq_file(struct drm_printer *p, struct va_format *vaf);
void __drm_puts_seq_file(struct drm_printer *p, const char *str);
void __drm_printfn_info(struct drm_printer *p, struct va_format *vaf);
void __drm_printfn_debug(struct drm_printer *p, struct va_format *vaf);
void __drm_printfn_err(struct drm_printer *p, struct va_format *vaf);

__printf(2, 3)
void drm_printf(struct drm_printer *p, const char *f, ...);
void drm_puts(struct drm_printer *p, const char *str);
void drm_print_regset32(struct drm_printer *p, struct debugfs_regset32 *regset);
void drm_print_bits(struct drm_printer *p, unsigned long value,
		    const char * const bits[], unsigned int nbits);

__printf(2, 0)
/**
 * drm_vprintf - print to a &drm_printer stream
 * @p: the &drm_printer
 * @fmt: format string
 * @va: the va_list
 */
static inline void
drm_vprintf(struct drm_printer *p, const char *fmt, va_list *va)
{
	struct va_format vaf = { .fmt = fmt, .va = va };

	p->printfn(p, &vaf);
}

/**
 * drm_printf_indent - Print to a &drm_printer stream with indentation
 * @printer: DRM printer
 * @indent: Tab indentation level (max 5)
 * @fmt: Format string
 */
#define drm_printf_indent(printer, indent, fmt, ...) \
	drm_printf((printer), "%.*s" fmt, (indent), "\t\t\t\t\tX", ##__VA_ARGS__)

/**
 * struct drm_print_iterator - local struct used with drm_printer_coredump
 * @data: Pointer to the devcoredump output buffer
 * @start: The offset within the buffer to start writing
 * @remain: The number of bytes to write for this iteration
 */
struct drm_print_iterator {
	void *data;
	ssize_t start;
	ssize_t remain;
	/* private: */
	ssize_t offset;
};

/**
 * drm_coredump_printer - construct a &drm_printer that can output to a buffer
 * from the read function for devcoredump
 * @iter: A pointer to a struct drm_print_iterator for the read instance
 *
 * This wrapper extends drm_printf() to work with a dev_coredumpm() callback
 * function. The passed in drm_print_iterator struct contains the buffer
 * pointer, size and offset as passed in from devcoredump.
 *
 * For example::
 *
 *	void coredump_read(char *buffer, loff_t offset, size_t count,
 *		void *data, size_t datalen)
 *	{
 *		struct drm_print_iterator iter;
 *		struct drm_printer p;
 *
 *		iter.data = buffer;
 *		iter.start = offset;
 *		iter.remain = count;
 *
 *		p = drm_coredump_printer(&iter);
 *
 *		drm_printf(p, "foo=%d\n", foo);
 *	}
 *
 *	void makecoredump(...)
 *	{
 *		...
 *		dev_coredumpm(dev, THIS_MODULE, data, 0, GFP_KERNEL,
 *			coredump_read, ...)
 *	}
 *
 * RETURNS:
 * The &drm_printer object
 */
static inline struct drm_printer
drm_coredump_printer(struct drm_print_iterator *iter)
{
	struct drm_printer p = {
		.printfn = __drm_printfn_coredump,
		.puts = __drm_puts_coredump,
		.arg = iter,
	};

	/* Set the internal offset of the iterator to zero */
	iter->offset = 0;

	return p;
}

/**
 * drm_seq_file_printer - construct a &drm_printer that outputs to &seq_file
 * @f:  the &struct seq_file to output to
 *
 * RETURNS:
 * The &drm_printer object
 */
static inline struct drm_printer drm_seq_file_printer(struct seq_file *f)
{
	struct drm_printer p = {
		.printfn = __drm_printfn_seq_file,
		.puts = __drm_puts_seq_file,
		.arg = f,
	};
	return p;
}

/**
 * drm_info_printer - construct a &drm_printer that outputs to dev_printk()
 * @dev: the &struct device pointer
 *
 * RETURNS:
 * The &drm_printer object
 */
static inline struct drm_printer drm_info_printer(struct device *dev)
{
	struct drm_printer p = {
		.printfn = __drm_printfn_info,
		.arg = dev,
	};
	return p;
}

/**
 * drm_debug_printer - construct a &drm_printer that outputs to pr_debug()
 * @prefix: debug output prefix
 *
 * RETURNS:
 * The &drm_printer object
 */
static inline struct drm_printer drm_debug_printer(const char *prefix)
{
	struct drm_printer p = {
		.printfn = __drm_printfn_debug,
		.prefix = prefix
	};
	return p;
}

/**
 * drm_err_printer - construct a &drm_printer that outputs to pr_err()
 * @prefix: debug output prefix
 *
 * RETURNS:
 * The &drm_printer object
 */
static inline struct drm_printer drm_err_printer(const char *prefix)
{
	struct drm_printer p = {
		.printfn = __drm_printfn_err,
		.prefix = prefix
	};
	return p;
}

/**
 * enum drm_debug_category - The DRM debug categories
 *
 * Each of the DRM debug logging macros use a specific category, and the logging
 * is filtered by the drm.debug module parameter. This enum specifies the values
 * for the interface.
 *
 * Each DRM_DEBUG_<CATEGORY> macro logs to DRM_UT_<CATEGORY> category, except
 * DRM_DEBUG() logs to DRM_UT_CORE.
 *
 * Enabling verbose debug messages is done through the drm.debug parameter, each
 * category being enabled by a bit:
 *
 *  - drm.debug=0x1 will enable CORE messages
 *  - drm.debug=0x2 will enable DRIVER messages
 *  - drm.debug=0x3 will enable CORE and DRIVER messages
 *  - ...
 *  - drm.debug=0x1ff will enable all messages
 *
 * An interesting feature is that it's possible to enable verbose logging at
 * run-time by echoing the debug value in its sysfs node::
 *
 *   # echo 0xf > /sys/module/drm/parameters/debug
 *
 */
enum drm_debug_category {
	/**
	 * @DRM_UT_CORE: Used in the generic drm code: drm_ioctl.c, drm_mm.c,
	 * drm_memory.c, ...
	 */
	DRM_UT_CORE		= 0x01,
	/**
	 * @DRM_UT_DRIVER: Used in the vendor specific part of the driver: i915,
	 * radeon, ... macro.
	 */
	DRM_UT_DRIVER		= 0x02,
	/**
	 * @DRM_UT_KMS: Used in the modesetting code.
	 */
	DRM_UT_KMS		= 0x04,
	/**
	 * @DRM_UT_PRIME: Used in the prime code.
	 */
	DRM_UT_PRIME		= 0x08,
	/**
	 * @DRM_UT_ATOMIC: Used in the atomic code.
	 */
	DRM_UT_ATOMIC		= 0x10,
	/**
	 * @DRM_UT_VBL: Used for verbose debug message in the vblank code.
	 */
	DRM_UT_VBL		= 0x20,
	/**
	 * @DRM_UT_STATE: Used for verbose atomic state debugging.
	 */
	DRM_UT_STATE		= 0x40,
	/**
	 * @DRM_UT_LEASE: Used in the lease code.
	 */
	DRM_UT_LEASE		= 0x80,
	/**
	 * @DRM_UT_DP: Used in the DP code.
	 */
	DRM_UT_DP		= 0x100,
	/**
	 * @DRM_UT_DRMRES: Used in the drm managed resources code.
	 */
	DRM_UT_DRMRES		= 0x200,
};

static inline bool drm_debug_enabled(enum drm_debug_category category)
{
	return unlikely(__drm_debug & category);
}

/*
 * struct device based logging
 *
 * Prefer drm_device based logging over device or prink based logging.
 */

__printf(3, 4)
void drm_dev_printk(const struct device *dev, const char *level,
		    const char *format, ...);
__printf(3, 4)
void drm_dev_dbg(const struct device *dev, enum drm_debug_category category,
		 const char *format, ...);

/**
 * DRM_DEV_ERROR() - Error output.
 *
 * @dev: device pointer
 * @fmt: printf() like format string.
 */
#define DRM_DEV_ERROR(dev, fmt, ...)					\
	drm_dev_printk(dev, KERN_ERR, "*ERROR* " fmt, ##__VA_ARGS__)

/**
 * DRM_DEV_ERROR_RATELIMITED() - Rate limited error output.
 *
 * @dev: device pointer
 * @fmt: printf() like format string.
 *
 * Like DRM_ERROR() but won't flood the log.
 */
#define DRM_DEV_ERROR_RATELIMITED(dev, fmt, ...)			\
({									\
	static DEFINE_RATELIMIT_STATE(_rs,				\
				      DEFAULT_RATELIMIT_INTERVAL,	\
				      DEFAULT_RATELIMIT_BURST);		\
									\
	if (__ratelimit(&_rs))						\
		DRM_DEV_ERROR(dev, fmt, ##__VA_ARGS__);			\
})

#define DRM_DEV_INFO(dev, fmt, ...)				\
	drm_dev_printk(dev, KERN_INFO, fmt, ##__VA_ARGS__)

#define DRM_DEV_INFO_ONCE(dev, fmt, ...)				\
({									\
	static bool __print_once __read_mostly;				\
	if (!__print_once) {						\
		__print_once = true;					\
		DRM_DEV_INFO(dev, fmt, ##__VA_ARGS__);			\
	}								\
})

/**
 * DRM_DEV_DEBUG() - Debug output for generic drm code
 *
 * @dev: device pointer
 * @fmt: printf() like format string.
 */
#define DRM_DEV_DEBUG(dev, fmt, ...)					\
	drm_dev_dbg(dev, DRM_UT_CORE, fmt, ##__VA_ARGS__)
/**
 * DRM_DEV_DEBUG_DRIVER() - Debug output for vendor specific part of the driver
 *
 * @dev: device pointer
 * @fmt: printf() like format string.
 */
#define DRM_DEV_DEBUG_DRIVER(dev, fmt, ...)				\
	drm_dev_dbg(dev, DRM_UT_DRIVER,	fmt, ##__VA_ARGS__)
/**
 * DRM_DEV_DEBUG_KMS() - Debug output for modesetting code
 *
 * @dev: device pointer
 * @fmt: printf() like format string.
 */
#define DRM_DEV_DEBUG_KMS(dev, fmt, ...)				\
	drm_dev_dbg(dev, DRM_UT_KMS, fmt, ##__VA_ARGS__)

/*
 * struct drm_device based logging
 *
 * Prefer drm_device based logging over device or prink based logging.
 */

/* Helper for struct drm_device based logging. */
#define __drm_printk(drm, level, type, fmt, ...)			\
	dev_##level##type((drm)->dev, "[drm] " fmt, ##__VA_ARGS__)


#define drm_info(drm, fmt, ...)					\
	__drm_printk((drm), info,, fmt, ##__VA_ARGS__)

#define drm_notice(drm, fmt, ...)				\
	__drm_printk((drm), notice,, fmt, ##__VA_ARGS__)

#define drm_warn(drm, fmt, ...)					\
	__drm_printk((drm), warn,, fmt, ##__VA_ARGS__)

#define drm_err(drm, fmt, ...)					\
	__drm_printk((drm), err,, "*ERROR* " fmt, ##__VA_ARGS__)


#define drm_info_once(drm, fmt, ...)				\
	__drm_printk((drm), info, _once, fmt, ##__VA_ARGS__)

#define drm_notice_once(drm, fmt, ...)				\
	__drm_printk((drm), notice, _once, fmt, ##__VA_ARGS__)

#define drm_warn_once(drm, fmt, ...)				\
	__drm_printk((drm), warn, _once, fmt, ##__VA_ARGS__)

#define drm_err_once(drm, fmt, ...)				\
	__drm_printk((drm), err, _once, "*ERROR* " fmt, ##__VA_ARGS__)


#define drm_err_ratelimited(drm, fmt, ...)				\
	__drm_printk((drm), err, _ratelimited, "*ERROR* " fmt, ##__VA_ARGS__)


#define drm_dbg_core(drm, fmt, ...)					\
	drm_dev_dbg((drm)->dev, DRM_UT_CORE, fmt, ##__VA_ARGS__)
#define drm_dbg(drm, fmt, ...)						\
	drm_dev_dbg((drm)->dev, DRM_UT_DRIVER, fmt, ##__VA_ARGS__)
#define drm_dbg_kms(drm, fmt, ...)					\
	drm_dev_dbg((drm)->dev, DRM_UT_KMS, fmt, ##__VA_ARGS__)
#define drm_dbg_prime(drm, fmt, ...)					\
	drm_dev_dbg((drm)->dev, DRM_UT_PRIME, fmt, ##__VA_ARGS__)
#define drm_dbg_atomic(drm, fmt, ...)					\
	drm_dev_dbg((drm)->dev, DRM_UT_ATOMIC, fmt, ##__VA_ARGS__)
#define drm_dbg_vbl(drm, fmt, ...)					\
	drm_dev_dbg((drm)->dev, DRM_UT_VBL, fmt, ##__VA_ARGS__)
#define drm_dbg_state(drm, fmt, ...)					\
	drm_dev_dbg((drm)->dev, DRM_UT_STATE, fmt, ##__VA_ARGS__)
#define drm_dbg_lease(drm, fmt, ...)					\
	drm_dev_dbg((drm)->dev, DRM_UT_LEASE, fmt, ##__VA_ARGS__)
#define drm_dbg_dp(drm, fmt, ...)					\
	drm_dev_dbg((drm)->dev, DRM_UT_DP, fmt, ##__VA_ARGS__)
#define drm_dbg_drmres(drm, fmt, ...)					\
	drm_dev_dbg((drm)->dev, DRM_UT_DRMRES, fmt, ##__VA_ARGS__)


/*
 * printk based logging
 *
 * Prefer drm_device based logging over device or prink based logging.
 */

__printf(2, 3)
void __drm_dbg(enum drm_debug_category category, const char *format, ...);
__printf(1, 2)
void __drm_err(const char *format, ...);

/* Macros to make printk easier */

#define _DRM_PRINTK(once, level, fmt, ...)				\
	printk##once(KERN_##level "[" DRM_NAME "] " fmt, ##__VA_ARGS__)

#define DRM_INFO(fmt, ...)						\
	_DRM_PRINTK(, INFO, fmt, ##__VA_ARGS__)
#define DRM_NOTE(fmt, ...)						\
	_DRM_PRINTK(, NOTICE, fmt, ##__VA_ARGS__)
#define DRM_WARN(fmt, ...)						\
	_DRM_PRINTK(, WARNING, fmt, ##__VA_ARGS__)

#define DRM_INFO_ONCE(fmt, ...)						\
	_DRM_PRINTK(_once, INFO, fmt, ##__VA_ARGS__)
#define DRM_NOTE_ONCE(fmt, ...)						\
	_DRM_PRINTK(_once, NOTICE, fmt, ##__VA_ARGS__)
#define DRM_WARN_ONCE(fmt, ...)						\
	_DRM_PRINTK(_once, WARNING, fmt, ##__VA_ARGS__)

#define DRM_ERROR(fmt, ...)						\
	__drm_err(fmt, ##__VA_ARGS__)

#define DRM_ERROR_RATELIMITED(fmt, ...)					\
	DRM_DEV_ERROR_RATELIMITED(NULL, fmt, ##__VA_ARGS__)

#define DRM_DEBUG(fmt, ...)						\
	__drm_dbg(DRM_UT_CORE, fmt, ##__VA_ARGS__)

#define DRM_DEBUG_DRIVER(fmt, ...)					\
	__drm_dbg(DRM_UT_DRIVER, fmt, ##__VA_ARGS__)

#define DRM_DEBUG_KMS(fmt, ...)						\
	__drm_dbg(DRM_UT_KMS, fmt, ##__VA_ARGS__)

#define DRM_DEBUG_PRIME(fmt, ...)					\
	__drm_dbg(DRM_UT_PRIME, fmt, ##__VA_ARGS__)

#define DRM_DEBUG_ATOMIC(fmt, ...)					\
	__drm_dbg(DRM_UT_ATOMIC, fmt, ##__VA_ARGS__)

#define DRM_DEBUG_VBL(fmt, ...)						\
	__drm_dbg(DRM_UT_VBL, fmt, ##__VA_ARGS__)

#define DRM_DEBUG_LEASE(fmt, ...)					\
	__drm_dbg(DRM_UT_LEASE, fmt, ##__VA_ARGS__)

#define DRM_DEBUG_DP(fmt, ...)						\
	__drm_dbg(DRM_UT_DP, fmt, ## __VA_ARGS__)


#define DRM_DEBUG_KMS_RATELIMITED(fmt, ...)				\
({									\
	static DEFINE_RATELIMIT_STATE(_rs,				\
				      DEFAULT_RATELIMIT_INTERVAL,       \
				      DEFAULT_RATELIMIT_BURST);         \
	if (__ratelimit(&_rs))						\
		drm_dev_dbg(NULL, DRM_UT_KMS, fmt, ##__VA_ARGS__);	\
})

/*
 * struct drm_device based WARNs
 *
 * drm_WARN*() acts like WARN*(), but with the key difference of
 * using device specific information so that we know from which device
 * warning is originating from.
 *
 * Prefer drm_device based drm_WARN* over regular WARN*
 */

/* Helper for struct drm_device based WARNs */
#define drm_WARN(drm, condition, format, arg...)			\
	WARN(condition, "%s %s: " format,				\
			dev_driver_string((drm)->dev),			\
			dev_name((drm)->dev), ## arg)

#define drm_WARN_ONCE(drm, condition, format, arg...)			\
	WARN_ONCE(condition, "%s %s: " format,				\
			dev_driver_string((drm)->dev),			\
			dev_name((drm)->dev), ## arg)

#define drm_WARN_ON(drm, x)						\
	drm_WARN((drm), (x), "%s",					\
		 "drm_WARN_ON(" __stringify(x) ")")

#define drm_WARN_ON_ONCE(drm, x)					\
	drm_WARN_ONCE((drm), (x), "%s",					\
		      "drm_WARN_ON_ONCE(" __stringify(x) ")")

#endif /* DRM_PRINT_H_ */