include/drm/drm_print.h

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