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