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