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 /* Do *not* use outside of drm_print.[ch]! */ 38 extern unsigned int __drm_debug; 39 40 /** 41 * DOC: print 42 * 43 * A simple wrapper for dev_printk(), seq_printf(), etc. Allows same 44 * debug code to be used for both debugfs and printk logging. 45 * 46 * For example:: 47 * 48 * void log_some_info(struct drm_printer *p) 49 * { 50 * drm_printf(p, "foo=%d\n", foo); 51 * drm_printf(p, "bar=%d\n", bar); 52 * } 53 * 54 * #ifdef CONFIG_DEBUG_FS 55 * void debugfs_show(struct seq_file *f) 56 * { 57 * struct drm_printer p = drm_seq_file_printer(f); 58 * log_some_info(&p); 59 * } 60 * #endif 61 * 62 * void some_other_function(...) 63 * { 64 * struct drm_printer p = drm_info_printer(drm->dev); 65 * log_some_info(&p); 66 * } 67 */ 68 69 /** 70 * struct drm_printer - drm output "stream" 71 * 72 * Do not use struct members directly. Use drm_printer_seq_file(), 73 * drm_printer_info(), etc to initialize. And drm_printf() for output. 74 */ 75 struct drm_printer { 76 /* private: */ 77 void (*printfn)(struct drm_printer *p, struct va_format *vaf); 78 void (*puts)(struct drm_printer *p, const char *str); 79 void *arg; 80 const char *prefix; 81 }; 82 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); 90 91 __printf(2, 3) 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); 97 98 __printf(2, 0) 99 /** 100 * drm_vprintf - print to a &drm_printer stream 101 * @p: the &drm_printer 102 * @fmt: format string 103 * @va: the va_list 104 */ 105 static inline void 106 drm_vprintf(struct drm_printer *p, const char *fmt, va_list *va) 107 { 108 struct va_format vaf = { .fmt = fmt, .va = va }; 109 110 p->printfn(p, &vaf); 111 } 112 113 /** 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 118 */ 119 #define drm_printf_indent(printer, indent, fmt, ...) \ 120 drm_printf((printer), "%.*s" fmt, (indent), "\t\t\t\t\tX", ##__VA_ARGS__) 121 122 /** 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 127 */ 128 struct drm_print_iterator { 129 void *data; 130 ssize_t start; 131 ssize_t remain; 132 /* private: */ 133 ssize_t offset; 134 }; 135 136 /** 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 140 * 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. 144 * 145 * For example:: 146 * 147 * void coredump_read(char *buffer, loff_t offset, size_t count, 148 * void *data, size_t datalen) 149 * { 150 * struct drm_print_iterator iter; 151 * struct drm_printer p; 152 * 153 * iter.data = buffer; 154 * iter.start = offset; 155 * iter.remain = count; 156 * 157 * p = drm_coredump_printer(&iter); 158 * 159 * drm_printf(p, "foo=%d\n", foo); 160 * } 161 * 162 * void makecoredump(...) 163 * { 164 * ... 165 * dev_coredumpm(dev, THIS_MODULE, data, 0, GFP_KERNEL, 166 * coredump_read, ...) 167 * } 168 * 169 * RETURNS: 170 * The &drm_printer object 171 */ 172 static inline struct drm_printer 173 drm_coredump_printer(struct drm_print_iterator *iter) 174 { 175 struct drm_printer p = { 176 .printfn = __drm_printfn_coredump, 177 .puts = __drm_puts_coredump, 178 .arg = iter, 179 }; 180 181 /* Set the internal offset of the iterator to zero */ 182 iter->offset = 0; 183 184 return p; 185 } 186 187 /** 188 * drm_seq_file_printer - construct a &drm_printer that outputs to &seq_file 189 * @f: the &struct seq_file to output to 190 * 191 * RETURNS: 192 * The &drm_printer object 193 */ 194 static inline struct drm_printer drm_seq_file_printer(struct seq_file *f) 195 { 196 struct drm_printer p = { 197 .printfn = __drm_printfn_seq_file, 198 .puts = __drm_puts_seq_file, 199 .arg = f, 200 }; 201 return p; 202 } 203 204 /** 205 * drm_info_printer - construct a &drm_printer that outputs to dev_printk() 206 * @dev: the &struct device pointer 207 * 208 * RETURNS: 209 * The &drm_printer object 210 */ 211 static inline struct drm_printer drm_info_printer(struct device *dev) 212 { 213 struct drm_printer p = { 214 .printfn = __drm_printfn_info, 215 .arg = dev, 216 }; 217 return p; 218 } 219 220 /** 221 * drm_debug_printer - construct a &drm_printer that outputs to pr_debug() 222 * @prefix: debug output prefix 223 * 224 * RETURNS: 225 * The &drm_printer object 226 */ 227 static inline struct drm_printer drm_debug_printer(const char *prefix) 228 { 229 struct drm_printer p = { 230 .printfn = __drm_printfn_debug, 231 .prefix = prefix 232 }; 233 return p; 234 } 235 236 /** 237 * drm_err_printer - construct a &drm_printer that outputs to pr_err() 238 * @prefix: debug output prefix 239 * 240 * RETURNS: 241 * The &drm_printer object 242 */ 243 static inline struct drm_printer drm_err_printer(const char *prefix) 244 { 245 struct drm_printer p = { 246 .printfn = __drm_printfn_err, 247 .prefix = prefix 248 }; 249 return p; 250 } 251 252 /** 253 * enum drm_debug_category - The DRM debug categories 254 * 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 257 * for the interface. 258 * 259 * Each DRM_DEBUG_<CATEGORY> macro logs to DRM_UT_<CATEGORY> category, except 260 * DRM_DEBUG() logs to DRM_UT_CORE. 261 * 262 * Enabling verbose debug messages is done through the drm.debug parameter, each 263 * category being enabled by a bit: 264 * 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 268 * - ... 269 * - drm.debug=0x1ff will enable all messages 270 * 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:: 273 * 274 * # echo 0xf > /sys/module/drm/parameters/debug 275 * 276 */ 277 enum drm_debug_category { 278 /** 279 * @DRM_UT_CORE: Used in the generic drm code: drm_ioctl.c, drm_mm.c, 280 * drm_memory.c, ... 281 */ 282 DRM_UT_CORE = 0x01, 283 /** 284 * @DRM_UT_DRIVER: Used in the vendor specific part of the driver: i915, 285 * radeon, ... macro. 286 */ 287 DRM_UT_DRIVER = 0x02, 288 /** 289 * @DRM_UT_KMS: Used in the modesetting code. 290 */ 291 DRM_UT_KMS = 0x04, 292 /** 293 * @DRM_UT_PRIME: Used in the prime code. 294 */ 295 DRM_UT_PRIME = 0x08, 296 /** 297 * @DRM_UT_ATOMIC: Used in the atomic code. 298 */ 299 DRM_UT_ATOMIC = 0x10, 300 /** 301 * @DRM_UT_VBL: Used for verbose debug message in the vblank code. 302 */ 303 DRM_UT_VBL = 0x20, 304 /** 305 * @DRM_UT_STATE: Used for verbose atomic state debugging. 306 */ 307 DRM_UT_STATE = 0x40, 308 /** 309 * @DRM_UT_LEASE: Used in the lease code. 310 */ 311 DRM_UT_LEASE = 0x80, 312 /** 313 * @DRM_UT_DP: Used in the DP code. 314 */ 315 DRM_UT_DP = 0x100, 316 /** 317 * @DRM_UT_DRMRES: Used in the drm managed resources code. 318 */ 319 DRM_UT_DRMRES = 0x200, 320 }; 321 322 static inline bool drm_debug_enabled(enum drm_debug_category category) 323 { 324 return unlikely(__drm_debug & category); 325 } 326 327 /* 328 * struct device based logging 329 * 330 * Prefer drm_device based logging over device or prink based logging. 331 */ 332 333 __printf(3, 4) 334 void drm_dev_printk(const struct device *dev, const char *level, 335 const char *format, ...); 336 __printf(3, 4) 337 void drm_dev_dbg(const struct device *dev, enum drm_debug_category category, 338 const char *format, ...); 339 340 /** 341 * Error output. 342 * 343 * @dev: device pointer 344 * @fmt: printf() like format string. 345 */ 346 #define DRM_DEV_ERROR(dev, fmt, ...) \ 347 drm_dev_printk(dev, KERN_ERR, "*ERROR* " fmt, ##__VA_ARGS__) 348 349 /** 350 * Rate limited error output. Like DRM_ERROR() but won't flood the log. 351 * 352 * @dev: device pointer 353 * @fmt: printf() like format string. 354 */ 355 #define DRM_DEV_ERROR_RATELIMITED(dev, fmt, ...) \ 356 ({ \ 357 static DEFINE_RATELIMIT_STATE(_rs, \ 358 DEFAULT_RATELIMIT_INTERVAL, \ 359 DEFAULT_RATELIMIT_BURST); \ 360 \ 361 if (__ratelimit(&_rs)) \ 362 DRM_DEV_ERROR(dev, fmt, ##__VA_ARGS__); \ 363 }) 364 365 #define DRM_DEV_INFO(dev, fmt, ...) \ 366 drm_dev_printk(dev, KERN_INFO, fmt, ##__VA_ARGS__) 367 368 #define DRM_DEV_INFO_ONCE(dev, fmt, ...) \ 369 ({ \ 370 static bool __print_once __read_mostly; \ 371 if (!__print_once) { \ 372 __print_once = true; \ 373 DRM_DEV_INFO(dev, fmt, ##__VA_ARGS__); \ 374 } \ 375 }) 376 377 /** 378 * Debug output. 379 * 380 * @dev: device pointer 381 * @fmt: printf() like format string. 382 */ 383 #define DRM_DEV_DEBUG(dev, fmt, ...) \ 384 drm_dev_dbg(dev, DRM_UT_CORE, fmt, ##__VA_ARGS__) 385 #define DRM_DEV_DEBUG_DRIVER(dev, fmt, ...) \ 386 drm_dev_dbg(dev, DRM_UT_DRIVER, fmt, ##__VA_ARGS__) 387 #define DRM_DEV_DEBUG_KMS(dev, fmt, ...) \ 388 drm_dev_dbg(dev, DRM_UT_KMS, fmt, ##__VA_ARGS__) 389 390 /* 391 * struct drm_device based logging 392 * 393 * Prefer drm_device based logging over device or prink based logging. 394 */ 395 396 /* Helper for struct drm_device based logging. */ 397 #define __drm_printk(drm, level, type, fmt, ...) \ 398 dev_##level##type((drm)->dev, "[drm] " fmt, ##__VA_ARGS__) 399 400 401 #define drm_info(drm, fmt, ...) \ 402 __drm_printk((drm), info,, fmt, ##__VA_ARGS__) 403 404 #define drm_notice(drm, fmt, ...) \ 405 __drm_printk((drm), notice,, fmt, ##__VA_ARGS__) 406 407 #define drm_warn(drm, fmt, ...) \ 408 __drm_printk((drm), warn,, fmt, ##__VA_ARGS__) 409 410 #define drm_err(drm, fmt, ...) \ 411 __drm_printk((drm), err,, "*ERROR* " fmt, ##__VA_ARGS__) 412 413 414 #define drm_info_once(drm, fmt, ...) \ 415 __drm_printk((drm), info, _once, fmt, ##__VA_ARGS__) 416 417 #define drm_notice_once(drm, fmt, ...) \ 418 __drm_printk((drm), notice, _once, fmt, ##__VA_ARGS__) 419 420 #define drm_warn_once(drm, fmt, ...) \ 421 __drm_printk((drm), warn, _once, fmt, ##__VA_ARGS__) 422 423 #define drm_err_once(drm, fmt, ...) \ 424 __drm_printk((drm), err, _once, "*ERROR* " fmt, ##__VA_ARGS__) 425 426 427 #define drm_err_ratelimited(drm, fmt, ...) \ 428 __drm_printk((drm), err, _ratelimited, "*ERROR* " fmt, ##__VA_ARGS__) 429 430 431 #define drm_dbg_core(drm, fmt, ...) \ 432 drm_dev_dbg((drm)->dev, DRM_UT_CORE, fmt, ##__VA_ARGS__) 433 #define drm_dbg(drm, fmt, ...) \ 434 drm_dev_dbg((drm)->dev, DRM_UT_DRIVER, fmt, ##__VA_ARGS__) 435 #define drm_dbg_kms(drm, fmt, ...) \ 436 drm_dev_dbg((drm)->dev, DRM_UT_KMS, fmt, ##__VA_ARGS__) 437 #define drm_dbg_prime(drm, fmt, ...) \ 438 drm_dev_dbg((drm)->dev, DRM_UT_PRIME, fmt, ##__VA_ARGS__) 439 #define drm_dbg_atomic(drm, fmt, ...) \ 440 drm_dev_dbg((drm)->dev, DRM_UT_ATOMIC, fmt, ##__VA_ARGS__) 441 #define drm_dbg_vbl(drm, fmt, ...) \ 442 drm_dev_dbg((drm)->dev, DRM_UT_VBL, fmt, ##__VA_ARGS__) 443 #define drm_dbg_state(drm, fmt, ...) \ 444 drm_dev_dbg((drm)->dev, DRM_UT_STATE, fmt, ##__VA_ARGS__) 445 #define drm_dbg_lease(drm, fmt, ...) \ 446 drm_dev_dbg((drm)->dev, DRM_UT_LEASE, fmt, ##__VA_ARGS__) 447 #define drm_dbg_dp(drm, fmt, ...) \ 448 drm_dev_dbg((drm)->dev, DRM_UT_DP, fmt, ##__VA_ARGS__) 449 #define drm_dbg_drmres(drm, fmt, ...) \ 450 drm_dev_dbg((drm)->dev, DRM_UT_DRMRES, fmt, ##__VA_ARGS__) 451 452 453 /* 454 * printk based logging 455 * 456 * Prefer drm_device based logging over device or prink based logging. 457 */ 458 459 __printf(2, 3) 460 void __drm_dbg(enum drm_debug_category category, const char *format, ...); 461 __printf(1, 2) 462 void __drm_err(const char *format, ...); 463 464 /* Macros to make printk easier */ 465 466 #define _DRM_PRINTK(once, level, fmt, ...) \ 467 printk##once(KERN_##level "[" DRM_NAME "] " fmt, ##__VA_ARGS__) 468 469 #define DRM_INFO(fmt, ...) \ 470 _DRM_PRINTK(, INFO, fmt, ##__VA_ARGS__) 471 #define DRM_NOTE(fmt, ...) \ 472 _DRM_PRINTK(, NOTICE, fmt, ##__VA_ARGS__) 473 #define DRM_WARN(fmt, ...) \ 474 _DRM_PRINTK(, WARNING, fmt, ##__VA_ARGS__) 475 476 #define DRM_INFO_ONCE(fmt, ...) \ 477 _DRM_PRINTK(_once, INFO, fmt, ##__VA_ARGS__) 478 #define DRM_NOTE_ONCE(fmt, ...) \ 479 _DRM_PRINTK(_once, NOTICE, fmt, ##__VA_ARGS__) 480 #define DRM_WARN_ONCE(fmt, ...) \ 481 _DRM_PRINTK(_once, WARNING, fmt, ##__VA_ARGS__) 482 483 #define DRM_ERROR(fmt, ...) \ 484 __drm_err(fmt, ##__VA_ARGS__) 485 486 #define DRM_ERROR_RATELIMITED(fmt, ...) \ 487 DRM_DEV_ERROR_RATELIMITED(NULL, fmt, ##__VA_ARGS__) 488 489 #define DRM_DEBUG(fmt, ...) \ 490 __drm_dbg(DRM_UT_CORE, fmt, ##__VA_ARGS__) 491 492 #define DRM_DEBUG_DRIVER(fmt, ...) \ 493 __drm_dbg(DRM_UT_DRIVER, fmt, ##__VA_ARGS__) 494 495 #define DRM_DEBUG_KMS(fmt, ...) \ 496 __drm_dbg(DRM_UT_KMS, fmt, ##__VA_ARGS__) 497 498 #define DRM_DEBUG_PRIME(fmt, ...) \ 499 __drm_dbg(DRM_UT_PRIME, fmt, ##__VA_ARGS__) 500 501 #define DRM_DEBUG_ATOMIC(fmt, ...) \ 502 __drm_dbg(DRM_UT_ATOMIC, fmt, ##__VA_ARGS__) 503 504 #define DRM_DEBUG_VBL(fmt, ...) \ 505 __drm_dbg(DRM_UT_VBL, fmt, ##__VA_ARGS__) 506 507 #define DRM_DEBUG_LEASE(fmt, ...) \ 508 __drm_dbg(DRM_UT_LEASE, fmt, ##__VA_ARGS__) 509 510 #define DRM_DEBUG_DP(fmt, ...) \ 511 __drm_dbg(DRM_UT_DP, fmt, ## __VA_ARGS__) 512 513 514 #define DRM_DEBUG_KMS_RATELIMITED(fmt, ...) \ 515 ({ \ 516 static DEFINE_RATELIMIT_STATE(_rs, \ 517 DEFAULT_RATELIMIT_INTERVAL, \ 518 DEFAULT_RATELIMIT_BURST); \ 519 if (__ratelimit(&_rs)) \ 520 drm_dev_dbg(NULL, DRM_UT_KMS, fmt, ##__VA_ARGS__); \ 521 }) 522 523 /* 524 * struct drm_device based WARNs 525 * 526 * drm_WARN*() acts like WARN*(), but with the key difference of 527 * using device specific information so that we know from which device 528 * warning is originating from. 529 * 530 * Prefer drm_device based drm_WARN* over regular WARN* 531 */ 532 533 /* Helper for struct drm_device based WARNs */ 534 #define drm_WARN(drm, condition, format, arg...) \ 535 WARN(condition, "%s %s: " format, \ 536 dev_driver_string((drm)->dev), \ 537 dev_name((drm)->dev), ## arg) 538 539 #define drm_WARN_ONCE(drm, condition, format, arg...) \ 540 WARN_ONCE(condition, "%s %s: " format, \ 541 dev_driver_string((drm)->dev), \ 542 dev_name((drm)->dev), ## arg) 543 544 #define drm_WARN_ON(drm, x) \ 545 drm_WARN((drm), (x), "%s", \ 546 "drm_WARN_ON(" __stringify(x) ")") 547 548 #define drm_WARN_ON_ONCE(drm, x) \ 549 drm_WARN_ONCE((drm), (x), "%s", \ 550 "drm_WARN_ON_ONCE(" __stringify(x) ")") 551 552 #endif /* DRM_PRINT_H_ */ 553