drivers/gpu/drm/drm_print.c

   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 #include <linux/debugfs.h>
  27 #include <linux/dynamic_debug.h>
  28 #include <linux/io.h>
  29 #include <linux/moduleparam.h>
  30 #include <linux/seq_file.h>
  31 #include <linux/slab.h>
  32 #include <linux/stdarg.h>
  33
  34 #include <drm/drm.h>
  35 #include <drm/drm_drv.h>
  36 #include <drm/drm_print.h>
  37
  38 /*
  39  * __drm_debug: Enable debug output.
  40  * Bitmask of DRM_UT_x. See include/drm/drm_print.h for details.
  41  */
  42 unsigned long __drm_debug;
  43 EXPORT_SYMBOL(__drm_debug);
  44
  45 MODULE_PARM_DESC(debug, "Enable debug output, where each bit enables a debug category.\n"
  46 "\t\tBit 0 (0x01)  will enable CORE messages (drm core code)\n"
  47 "\t\tBit 1 (0x02)  will enable DRIVER messages (drm controller code)\n"
  48 "\t\tBit 2 (0x04)  will enable KMS messages (modesetting code)\n"
  49 "\t\tBit 3 (0x08)  will enable PRIME messages (prime code)\n"
  50 "\t\tBit 4 (0x10)  will enable ATOMIC messages (atomic code)\n"
  51 "\t\tBit 5 (0x20)  will enable VBL messages (vblank code)\n"
  52 "\t\tBit 7 (0x80)  will enable LEASE messages (leasing code)\n"
  53 "\t\tBit 8 (0x100) will enable DP messages (displayport code)");
  54
  55 #if !defined(CONFIG_DRM_USE_DYNAMIC_DEBUG)
  56 module_param_named(debug, __drm_debug, ulong, 0600);
  57 #else
  58 /* classnames must match vals of enum drm_debug_category */
  59 DECLARE_DYNDBG_CLASSMAP(drm_debug_classes, DD_CLASS_TYPE_DISJOINT_BITS, 0,
  60                         "DRM_UT_CORE",
  61                         "DRM_UT_DRIVER",
  62                         "DRM_UT_KMS",
  63                         "DRM_UT_PRIME",
  64                         "DRM_UT_ATOMIC",
  65                         "DRM_UT_VBL",
  66                         "DRM_UT_STATE",
  67                         "DRM_UT_LEASE",
  68                         "DRM_UT_DP",
  69                         "DRM_UT_DRMRES");
  70
  71 static struct ddebug_class_param drm_debug_bitmap = {
  72         .bits = &__drm_debug,
  73         .flags = "p",
  74         .map = &drm_debug_classes,
  75 };
  76 module_param_cb(debug, &param_ops_dyndbg_classes, &drm_debug_bitmap, 0600);
  77 #endif
  78
  79 void __drm_puts_coredump(struct drm_printer *p, const char *str)
  80 {
  81         struct drm_print_iterator *iterator = p->arg;
  82         ssize_t len;
  83
  84         if (!iterator->remain)
  85                 return;
  86
  87         if (iterator->offset < iterator->start) {
  88                 ssize_t copy;
  89
  90                 len = strlen(str);
  91
  92                 if (iterator->offset + len <= iterator->start) {
  93                         iterator->offset += len;
  94                         return;
  95                 }
  96
  97                 copy = len - (iterator->start - iterator->offset);
  98
  99                 if (copy > iterator->remain)
 100                         copy = iterator->remain;
 101
 102                 /* Copy out the bit of the string that we need */
 103                 if (iterator->data)
 104                         memcpy(iterator->data,
 105                                str + (iterator->start - iterator->offset), copy);
 106
 107                 iterator->offset = iterator->start + copy;
 108                 iterator->remain -= copy;
 109         } else {
 110                 ssize_t pos = iterator->offset - iterator->start;
 111
 112                 len = min_t(ssize_t, strlen(str), iterator->remain);
 113
 114                 if (iterator->data)
 115                         memcpy(iterator->data + pos, str, len);
 116
 117                 iterator->offset += len;
 118                 iterator->remain -= len;
 119         }
 120 }
 121 EXPORT_SYMBOL(__drm_puts_coredump);
 122
 123 void __drm_printfn_coredump(struct drm_printer *p, struct va_format *vaf)
 124 {
 125         struct drm_print_iterator *iterator = p->arg;
 126         size_t len;
 127         char *buf;
 128
 129         if (!iterator->remain)
 130                 return;
 131
 132         /* Figure out how big the string will be */
 133         len = snprintf(NULL, 0, "%pV", vaf);
 134
 135         /* This is the easiest path, we've already advanced beyond the offset */
 136         if (iterator->offset + len <= iterator->start) {
 137                 iterator->offset += len;
 138                 return;
 139         }
 140
 141         /* Then check if we can directly copy into the target buffer */
 142         if ((iterator->offset >= iterator->start) && (len < iterator->remain)) {
 143                 ssize_t pos = iterator->offset - iterator->start;
 144
 145                 if (iterator->data)
 146                         snprintf(((char *) iterator->data) + pos,
 147                                  iterator->remain, "%pV", vaf);
 148
 149                 iterator->offset += len;
 150                 iterator->remain -= len;
 151
 152                 return;
 153         }
 154
 155         /*
 156          * Finally, hit the slow path and make a temporary string to copy over
 157          * using _drm_puts_coredump
 158          */
 159         buf = kmalloc(len + 1, GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY);
 160         if (!buf)
 161                 return;
 162
 163         snprintf(buf, len + 1, "%pV", vaf);
 164         __drm_puts_coredump(p, (const char *) buf);
 165
 166         kfree(buf);
 167 }
 168 EXPORT_SYMBOL(__drm_printfn_coredump);
 169
 170 void __drm_puts_seq_file(struct drm_printer *p, const char *str)
 171 {
 172         seq_puts(p->arg, str);
 173 }
 174 EXPORT_SYMBOL(__drm_puts_seq_file);
 175
 176 void __drm_printfn_seq_file(struct drm_printer *p, struct va_format *vaf)
 177 {
 178         seq_printf(p->arg, "%pV", vaf);
 179 }
 180 EXPORT_SYMBOL(__drm_printfn_seq_file);
 181
 182 static void __drm_dev_vprintk(const struct device *dev, const char *level,
 183                               const void *origin, const char *prefix,
 184                               struct va_format *vaf)
 185 {
 186         const char *prefix_pad = prefix ? " " : "";
 187
 188         if (!prefix)
 189                 prefix = "";
 190
 191         if (dev) {
 192                 if (origin)
 193                         dev_printk(level, dev, "[" DRM_NAME ":%ps]%s%s %pV",
 194                                    origin, prefix_pad, prefix, vaf);
 195                 else
 196                         dev_printk(level, dev, "[" DRM_NAME "]%s%s %pV",
 197                                    prefix_pad, prefix, vaf);
 198         } else {
 199                 if (origin)
 200                         printk("%s" "[" DRM_NAME ":%ps]%s%s %pV",
 201                                level, origin, prefix_pad, prefix, vaf);
 202                 else
 203                         printk("%s" "[" DRM_NAME "]%s%s %pV",
 204                                level, prefix_pad, prefix, vaf);
 205         }
 206 }
 207
 208 void __drm_printfn_info(struct drm_printer *p, struct va_format *vaf)
 209 {
 210         dev_info(p->arg, "[" DRM_NAME "] %pV", vaf);
 211 }
 212 EXPORT_SYMBOL(__drm_printfn_info);
 213
 214 void __drm_printfn_dbg(struct drm_printer *p, struct va_format *vaf)
 215 {
 216         const struct drm_device *drm = p->arg;
 217         const struct device *dev = drm ? drm->dev : NULL;
 218         enum drm_debug_category category = p->category;
 219
 220         if (!__drm_debug_enabled(category))
 221                 return;
 222
 223         __drm_dev_vprintk(dev, KERN_DEBUG, p->origin, p->prefix, vaf);
 224 }
 225 EXPORT_SYMBOL(__drm_printfn_dbg);
 226
 227 void __drm_printfn_err(struct drm_printer *p, struct va_format *vaf)
 228 {
 229         struct drm_device *drm = p->arg;
 230
 231         if (p->prefix)
 232                 drm_err(drm, "%s %pV", p->prefix, vaf);
 233         else
 234                 drm_err(drm, "%pV", vaf);
 235 }
 236 EXPORT_SYMBOL(__drm_printfn_err);
 237
 238 void __drm_printfn_line(struct drm_printer *p, struct va_format *vaf)
 239 {
 240         unsigned int counter = ++p->line.counter;
 241         const char *prefix = p->prefix ?: "";
 242         const char *pad = p->prefix ? " " : "";
 243
 244         if (p->line.series)
 245                 drm_printf(p->arg, "%s%s%u.%u: %pV",
 246                            prefix, pad, p->line.series, counter, vaf);
 247         else
 248                 drm_printf(p->arg, "%s%s%u: %pV", prefix, pad, counter, vaf);
 249 }
 250 EXPORT_SYMBOL(__drm_printfn_line);
 251
 252 /**
 253  * drm_puts - print a const string to a &drm_printer stream
 254  * @p: the &drm printer
 255  * @str: const string
 256  *
 257  * Allow &drm_printer types that have a constant string
 258  * option to use it.
 259  */
 260 void drm_puts(struct drm_printer *p, const char *str)
 261 {
 262         if (p->puts)
 263                 p->puts(p, str);
 264         else
 265                 drm_printf(p, "%s", str);
 266 }
 267 EXPORT_SYMBOL(drm_puts);
 268
 269 /**
 270  * drm_printf - print to a &drm_printer stream
 271  * @p: the &drm_printer
 272  * @f: format string
 273  */
 274 void drm_printf(struct drm_printer *p, const char *f, ...)
 275 {
 276         va_list args;
 277
 278         va_start(args, f);
 279         drm_vprintf(p, f, &args);
 280         va_end(args);
 281 }
 282 EXPORT_SYMBOL(drm_printf);
 283
 284 /**
 285  * drm_print_bits - print bits to a &drm_printer stream
 286  *
 287  * Print bits (in flag fields for example) in human readable form.
 288  *
 289  * @p: the &drm_printer
 290  * @value: field value.
 291  * @bits: Array with bit names.
 292  * @nbits: Size of bit names array.
 293  */
 294 void drm_print_bits(struct drm_printer *p, unsigned long value,
 295                     const char * const bits[], unsigned int nbits)
 296 {
 297         bool first = true;
 298         unsigned int i;
 299
 300         if (WARN_ON_ONCE(nbits > BITS_PER_TYPE(value)))
 301                 nbits = BITS_PER_TYPE(value);
 302
 303         for_each_set_bit(i, &value, nbits) {
 304                 if (WARN_ON_ONCE(!bits[i]))
 305                         continue;
 306                 drm_printf(p, "%s%s", first ? "" : ",",
 307                            bits[i]);
 308                 first = false;
 309         }
 310         if (first)
 311                 drm_printf(p, "(none)");
 312 }
 313 EXPORT_SYMBOL(drm_print_bits);
 314
 315 void drm_dev_printk(const struct device *dev, const char *level,
 316                     const char *format, ...)
 317 {
 318         struct va_format vaf;
 319         va_list args;
 320
 321         va_start(args, format);
 322         vaf.fmt = format;
 323         vaf.va = &args;
 324
 325         __drm_dev_vprintk(dev, level, __builtin_return_address(0), NULL, &vaf);
 326
 327         va_end(args);
 328 }
 329 EXPORT_SYMBOL(drm_dev_printk);
 330
 331 void __drm_dev_dbg(struct _ddebug *desc, const struct device *dev,
 332                    enum drm_debug_category category, const char *format, ...)
 333 {
 334         struct va_format vaf;
 335         va_list args;
 336
 337         if (!__drm_debug_enabled(category))
 338                 return;
 339
 340         /* we know we are printing for either syslog, tracefs, or both */
 341         va_start(args, format);
 342         vaf.fmt = format;
 343         vaf.va = &args;
 344
 345         __drm_dev_vprintk(dev, KERN_DEBUG, __builtin_return_address(0), NULL, &vaf);
 346
 347         va_end(args);
 348 }
 349 EXPORT_SYMBOL(__drm_dev_dbg);
 350
 351 void __drm_err(const char *format, ...)
 352 {
 353         struct va_format vaf;
 354         va_list args;
 355
 356         va_start(args, format);
 357         vaf.fmt = format;
 358         vaf.va = &args;
 359
 360         __drm_dev_vprintk(NULL, KERN_ERR, __builtin_return_address(0), "*ERROR*", &vaf);
 361
 362         va_end(args);
 363 }
 364 EXPORT_SYMBOL(__drm_err);
 365
 366 /**
 367  * drm_print_regset32 - print the contents of registers to a
 368  * &drm_printer stream.
 369  *
 370  * @p: the &drm printer
 371  * @regset: the list of registers to print.
 372  *
 373  * Often in driver debug, it's useful to be able to either capture the
 374  * contents of registers in the steady state using debugfs or at
 375  * specific points during operation.  This lets the driver have a
 376  * single list of registers for both.
 377  */
 378 void drm_print_regset32(struct drm_printer *p, struct debugfs_regset32 *regset)
 379 {
 380         int namelen = 0;
 381         int i;
 382
 383         for (i = 0; i < regset->nregs; i++)
 384                 namelen = max(namelen, (int)strlen(regset->regs[i].name));
 385
 386         for (i = 0; i < regset->nregs; i++) {
 387                 drm_printf(p, "%*s = 0x%08x\n",
 388                            namelen, regset->regs[i].name,
 389                            readl(regset->base + regset->regs[i].offset));
 390         }
 391 }
 392 EXPORT_SYMBOL(drm_print_regset32);