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
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>
34
35 #include <drm/drm.h>
36
37 /**
38 * DOC: print
39 *
40 * A simple wrapper for dev_printk(), seq_printf(), etc. Allows same
41 * debug code to be used for both debugfs and printk logging.
42 *
43 * For example::
44 *
45 * void log_some_info(struct drm_printer *p)
46 * {
47 * drm_printf(p, "foo=%d\n", foo);
48 * drm_printf(p, "bar=%d\n", bar);
49 * }
50 *
51 * #ifdef CONFIG_DEBUG_FS
52 * void debugfs_show(struct seq_file *f)
53 * {
54 * struct drm_printer p = drm_seq_file_printer(f);
55 * log_some_info(&p);
56 * }
57 * #endif
58 *
59 * void some_other_function(...)
60 * {
61 * struct drm_printer p = drm_info_printer(drm->dev);
62 * log_some_info(&p);
63 * }
64 */
65
66 /**
67 * struct drm_printer - drm output "stream"
68 *
69 * Do not use struct members directly. Use drm_printer_seq_file(),
70 * drm_printer_info(), etc to initialize. And drm_printf() for output.
71 */
72 struct drm_printer {
73 /* private: */
74 void (*printfn)(struct drm_printer *p, struct va_format *vaf);
75 void (*puts)(struct drm_printer *p, const char *str);
76 void *arg;
77 const char *prefix;
78 };
79
80 void __drm_printfn_coredump(struct drm_printer *p, struct va_format *vaf);
81 void __drm_puts_coredump(struct drm_printer *p, const char *str);
82 void __drm_printfn_seq_file(struct drm_printer *p, struct va_format *vaf);
83 void __drm_puts_seq_file(struct drm_printer *p, const char *str);
84 void __drm_printfn_info(struct drm_printer *p, struct va_format *vaf);
85 void __drm_printfn_debug(struct drm_printer *p, struct va_format *vaf);
86
87 __printf(2, 3)
88 void drm_printf(struct drm_printer *p, const char *f, ...);
89 void drm_puts(struct drm_printer *p, const char *str);
90 void drm_print_regset32(struct drm_printer *p, struct debugfs_regset32 *regset);
91
92 __printf(2, 0)
93 /**
94 * drm_vprintf - print to a &drm_printer stream
95 * @p: the &drm_printer
96 * @fmt: format string
97 * @va: the va_list
98 */
99 static inline void
drm_vprintf(struct drm_printer * p,const char * fmt,va_list * va)100 drm_vprintf(struct drm_printer *p, const char *fmt, va_list *va)
101 {
102 struct va_format vaf = { .fmt = fmt, .va = va };
103
104 p->printfn(p, &vaf);
105 }
106
107 /**
108 * drm_printf_indent - Print to a &drm_printer stream with indentation
109 * @printer: DRM printer
110 * @indent: Tab indentation level (max 5)
111 * @fmt: Format string
112 */
113 #define drm_printf_indent(printer, indent, fmt, ...) \
114 drm_printf((printer), "%.*s" fmt, (indent), "\t\t\t\t\tX", ##__VA_ARGS__)
115
116 /**
117 * struct drm_print_iterator - local struct used with drm_printer_coredump
118 * @data: Pointer to the devcoredump output buffer
119 * @start: The offset within the buffer to start writing
120 * @remain: The number of bytes to write for this iteration
121 */
122 struct drm_print_iterator {
123 void *data;
124 ssize_t start;
125 ssize_t remain;
126 /* private: */
127 ssize_t offset;
128 };
129
130 /**
131 * drm_coredump_printer - construct a &drm_printer that can output to a buffer
132 * from the read function for devcoredump
133 * @iter: A pointer to a struct drm_print_iterator for the read instance
134 *
135 * This wrapper extends drm_printf() to work with a dev_coredumpm() callback
136 * function. The passed in drm_print_iterator struct contains the buffer
137 * pointer, size and offset as passed in from devcoredump.
138 *
139 * For example::
140 *
141 * void coredump_read(char *buffer, loff_t offset, size_t count,
142 * void *data, size_t datalen)
143 * {
144 * struct drm_print_iterator iter;
145 * struct drm_printer p;
146 *
147 * iter.data = buffer;
148 * iter.start = offset;
149 * iter.remain = count;
150 *
151 * p = drm_coredump_printer(&iter);
152 *
153 * drm_printf(p, "foo=%d\n", foo);
154 * }
155 *
156 * void makecoredump(...)
157 * {
158 * ...
159 * dev_coredumpm(dev, THIS_MODULE, data, 0, GFP_KERNEL,
160 * coredump_read, ...)
161 * }
162 *
163 * RETURNS:
164 * The &drm_printer object
165 */
166 static inline struct drm_printer
drm_coredump_printer(struct drm_print_iterator * iter)167 drm_coredump_printer(struct drm_print_iterator *iter)
168 {
169 struct drm_printer p = {
170 .printfn = __drm_printfn_coredump,
171 .puts = __drm_puts_coredump,
172 .arg = iter,
173 };
174
175 /* Set the internal offset of the iterator to zero */
176 iter->offset = 0;
177
178 return p;
179 }
180
181 /**
182 * drm_seq_file_printer - construct a &drm_printer that outputs to &seq_file
183 * @f: the &struct seq_file to output to
184 *
185 * RETURNS:
186 * The &drm_printer object
187 */
drm_seq_file_printer(struct seq_file * f)188 static inline struct drm_printer drm_seq_file_printer(struct seq_file *f)
189 {
190 struct drm_printer p = {
191 .printfn = __drm_printfn_seq_file,
192 .puts = __drm_puts_seq_file,
193 .arg = f,
194 };
195 return p;
196 }
197
198 /**
199 * drm_info_printer - construct a &drm_printer that outputs to dev_printk()
200 * @dev: the &struct device pointer
201 *
202 * RETURNS:
203 * The &drm_printer object
204 */
drm_info_printer(struct device * dev)205 static inline struct drm_printer drm_info_printer(struct device *dev)
206 {
207 struct drm_printer p = {
208 .printfn = __drm_printfn_info,
209 .arg = dev,
210 };
211 return p;
212 }
213
214 /**
215 * drm_debug_printer - construct a &drm_printer that outputs to pr_debug()
216 * @prefix: debug output prefix
217 *
218 * RETURNS:
219 * The &drm_printer object
220 */
drm_debug_printer(const char * prefix)221 static inline struct drm_printer drm_debug_printer(const char *prefix)
222 {
223 struct drm_printer p = {
224 .printfn = __drm_printfn_debug,
225 .prefix = prefix
226 };
227 return p;
228 }
229
230 /*
231 * The following categories are defined:
232 *
233 * CORE: Used in the generic drm code: drm_ioctl.c, drm_mm.c, drm_memory.c, ...
234 * This is the category used by the DRM_DEBUG() macro.
235 *
236 * DRIVER: Used in the vendor specific part of the driver: i915, radeon, ...
237 * This is the category used by the DRM_DEBUG_DRIVER() macro.
238 *
239 * KMS: used in the modesetting code.
240 * This is the category used by the DRM_DEBUG_KMS() macro.
241 *
242 * PRIME: used in the prime code.
243 * This is the category used by the DRM_DEBUG_PRIME() macro.
244 *
245 * ATOMIC: used in the atomic code.
246 * This is the category used by the DRM_DEBUG_ATOMIC() macro.
247 *
248 * VBL: used for verbose debug message in the vblank code
249 * This is the category used by the DRM_DEBUG_VBL() macro.
250 *
251 * Enabling verbose debug messages is done through the drm.debug parameter,
252 * each category being enabled by a bit.
253 *
254 * drm.debug=0x1 will enable CORE messages
255 * drm.debug=0x2 will enable DRIVER messages
256 * drm.debug=0x3 will enable CORE and DRIVER messages
257 * ...
258 * drm.debug=0x3f will enable all messages
259 *
260 * An interesting feature is that it's possible to enable verbose logging at
261 * run-time by echoing the debug value in its sysfs node:
262 * # echo 0xf > /sys/module/drm/parameters/debug
263 */
264 #define DRM_UT_NONE 0x00
265 #define DRM_UT_CORE 0x01
266 #define DRM_UT_DRIVER 0x02
267 #define DRM_UT_KMS 0x04
268 #define DRM_UT_PRIME 0x08
269 #define DRM_UT_ATOMIC 0x10
270 #define DRM_UT_VBL 0x20
271 #define DRM_UT_STATE 0x40
272 #define DRM_UT_LEASE 0x80
273 #define DRM_UT_DP 0x100
274
275 __printf(3, 4)
276 void drm_dev_printk(const struct device *dev, const char *level,
277 const char *format, ...);
278 __printf(3, 4)
279 void drm_dev_dbg(const struct device *dev, unsigned int category,
280 const char *format, ...);
281
282 __printf(2, 3)
283 void drm_dbg(unsigned int category, const char *format, ...);
284 __printf(1, 2)
285 void drm_err(const char *format, ...);
286
287 /* Macros to make printk easier */
288
289 #define _DRM_PRINTK(once, level, fmt, ...) \
290 printk##once(KERN_##level "[" DRM_NAME "] " fmt, ##__VA_ARGS__)
291
292 #define DRM_INFO(fmt, ...) \
293 _DRM_PRINTK(, INFO, fmt, ##__VA_ARGS__)
294 #define DRM_NOTE(fmt, ...) \
295 _DRM_PRINTK(, NOTICE, fmt, ##__VA_ARGS__)
296 #define DRM_WARN(fmt, ...) \
297 _DRM_PRINTK(, WARNING, fmt, ##__VA_ARGS__)
298
299 #define DRM_INFO_ONCE(fmt, ...) \
300 _DRM_PRINTK(_once, INFO, fmt, ##__VA_ARGS__)
301 #define DRM_NOTE_ONCE(fmt, ...) \
302 _DRM_PRINTK(_once, NOTICE, fmt, ##__VA_ARGS__)
303 #define DRM_WARN_ONCE(fmt, ...) \
304 _DRM_PRINTK(_once, WARNING, fmt, ##__VA_ARGS__)
305
306 /**
307 * Error output.
308 *
309 * @dev: device pointer
310 * @fmt: printf() like format string.
311 */
312 #define DRM_DEV_ERROR(dev, fmt, ...) \
313 drm_dev_printk(dev, KERN_ERR, "*ERROR* " fmt, ##__VA_ARGS__)
314 #define DRM_ERROR(fmt, ...) \
315 drm_err(fmt, ##__VA_ARGS__)
316
317 /**
318 * Rate limited error output. Like DRM_ERROR() but won't flood the log.
319 *
320 * @dev: device pointer
321 * @fmt: printf() like format string.
322 */
323 #define DRM_DEV_ERROR_RATELIMITED(dev, fmt, ...) \
324 ({ \
325 static DEFINE_RATELIMIT_STATE(_rs, \
326 DEFAULT_RATELIMIT_INTERVAL, \
327 DEFAULT_RATELIMIT_BURST); \
328 \
329 if (__ratelimit(&_rs)) \
330 DRM_DEV_ERROR(dev, fmt, ##__VA_ARGS__); \
331 })
332 #define DRM_ERROR_RATELIMITED(fmt, ...) \
333 DRM_DEV_ERROR_RATELIMITED(NULL, fmt, ##__VA_ARGS__)
334
335 #define DRM_DEV_INFO(dev, fmt, ...) \
336 drm_dev_printk(dev, KERN_INFO, fmt, ##__VA_ARGS__)
337
338 #define DRM_DEV_INFO_ONCE(dev, fmt, ...) \
339 ({ \
340 static bool __print_once __read_mostly; \
341 if (!__print_once) { \
342 __print_once = true; \
343 DRM_DEV_INFO(dev, fmt, ##__VA_ARGS__); \
344 } \
345 })
346
347 /**
348 * Debug output.
349 *
350 * @dev: device pointer
351 * @fmt: printf() like format string.
352 */
353 #define DRM_DEV_DEBUG(dev, fmt, ...) \
354 drm_dev_dbg(dev, DRM_UT_CORE, fmt, ##__VA_ARGS__)
355 #define DRM_DEBUG(fmt, ...) \
356 drm_dbg(DRM_UT_CORE, fmt, ##__VA_ARGS__)
357
358 #define DRM_DEV_DEBUG_DRIVER(dev, fmt, ...) \
359 drm_dev_dbg(dev, DRM_UT_DRIVER, fmt, ##__VA_ARGS__)
360 #define DRM_DEBUG_DRIVER(fmt, ...) \
361 drm_dbg(DRM_UT_DRIVER, fmt, ##__VA_ARGS__)
362
363 #define DRM_DEV_DEBUG_KMS(dev, fmt, ...) \
364 drm_dev_dbg(dev, DRM_UT_KMS, fmt, ##__VA_ARGS__)
365 #define DRM_DEBUG_KMS(fmt, ...) \
366 drm_dbg(DRM_UT_KMS, fmt, ##__VA_ARGS__)
367
368 #define DRM_DEV_DEBUG_PRIME(dev, fmt, ...) \
369 drm_dev_dbg(dev, DRM_UT_PRIME, fmt, ##__VA_ARGS__)
370 #define DRM_DEBUG_PRIME(fmt, ...) \
371 drm_dbg(DRM_UT_PRIME, fmt, ##__VA_ARGS__)
372
373 #define DRM_DEV_DEBUG_ATOMIC(dev, fmt, ...) \
374 drm_dev_dbg(dev, DRM_UT_ATOMIC, fmt, ##__VA_ARGS__)
375 #define DRM_DEBUG_ATOMIC(fmt, ...) \
376 drm_dbg(DRM_UT_ATOMIC, fmt, ##__VA_ARGS__)
377
378 #define DRM_DEV_DEBUG_VBL(dev, fmt, ...) \
379 drm_dev_dbg(dev, DRM_UT_VBL, fmt, ##__VA_ARGS__)
380 #define DRM_DEBUG_VBL(fmt, ...) \
381 drm_dbg(DRM_UT_VBL, fmt, ##__VA_ARGS__)
382
383 #define DRM_DEBUG_LEASE(fmt, ...) \
384 drm_dbg(DRM_UT_LEASE, fmt, ##__VA_ARGS__)
385
386 #define DRM_DEV_DEBUG_DP(dev, fmt, ...) \
387 drm_dev_dbg(dev, DRM_UT_DP, fmt, ## __VA_ARGS__)
388 #define DRM_DEBUG_DP(fmt, ...) \
389 drm_dbg(DRM_UT_DP, fmt, ## __VA_ARGS__)
390
391 #define _DRM_DEV_DEFINE_DEBUG_RATELIMITED(dev, category, fmt, ...) \
392 ({ \
393 static DEFINE_RATELIMIT_STATE(_rs, \
394 DEFAULT_RATELIMIT_INTERVAL, \
395 DEFAULT_RATELIMIT_BURST); \
396 if (__ratelimit(&_rs)) \
397 drm_dev_dbg(dev, category, fmt, ##__VA_ARGS__); \
398 })
399
400 /**
401 * Rate limited debug output. Like DRM_DEBUG() but won't flood the log.
402 *
403 * @dev: device pointer
404 * @fmt: printf() like format string.
405 */
406 #define DRM_DEV_DEBUG_RATELIMITED(dev, fmt, ...) \
407 _DEV_DRM_DEFINE_DEBUG_RATELIMITED(dev, DRM_UT_CORE, \
408 fmt, ##__VA_ARGS__)
409 #define DRM_DEBUG_RATELIMITED(fmt, ...) \
410 DRM_DEV_DEBUG_RATELIMITED(NULL, fmt, ##__VA_ARGS__)
411
412 #define DRM_DEV_DEBUG_DRIVER_RATELIMITED(dev, fmt, ...) \
413 _DRM_DEV_DEFINE_DEBUG_RATELIMITED(dev, DRM_UT_DRIVER, \
414 fmt, ##__VA_ARGS__)
415 #define DRM_DEBUG_DRIVER_RATELIMITED(fmt, ...) \
416 DRM_DEV_DEBUG_DRIVER_RATELIMITED(NULL, fmt, ##__VA_ARGS__)
417
418 #define DRM_DEV_DEBUG_KMS_RATELIMITED(dev, fmt, ...) \
419 _DRM_DEV_DEFINE_DEBUG_RATELIMITED(dev, DRM_UT_KMS, \
420 fmt, ##__VA_ARGS__)
421 #define DRM_DEBUG_KMS_RATELIMITED(fmt, ...) \
422 DRM_DEV_DEBUG_KMS_RATELIMITED(NULL, fmt, ##__VA_ARGS__)
423
424 #define DRM_DEV_DEBUG_PRIME_RATELIMITED(dev, fmt, ...) \
425 _DRM_DEV_DEFINE_DEBUG_RATELIMITED(dev, DRM_UT_PRIME, \
426 fmt, ##__VA_ARGS__)
427 #define DRM_DEBUG_PRIME_RATELIMITED(fmt, ...) \
428 DRM_DEV_DEBUG_PRIME_RATELIMITED(NULL, fmt, ##__VA_ARGS__)
429
430 #endif /* DRM_PRINT_H_ */
431