src/intel/tools/aubinator_error_decode.c

   1 /*
   2  * Copyright © 2007-2017 Intel Corporation
   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 (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  *
  23  */
  24
  25 #include <stdbool.h>
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <stdarg.h>
  29 #include <string.h>
  30 #include <unistd.h>
  31 #include <inttypes.h>
  32 #include <errno.h>
  33 #include <sys/stat.h>
  34 #include <sys/types.h>
  35 #include <sys/wait.h>
  36 #include <err.h>
  37 #include <assert.h>
  38 #include <getopt.h>
  39 #include <zlib.h>
  40
  41 #include "common/gen_decoder.h"
  42 #include "util/macros.h"
  43
  44 #define CSI "\e["
  45 #define BLUE_HEADER  CSI "0;44m"
  46 #define GREEN_HEADER CSI "1;42m"
  47 #define NORMAL       CSI "0m"
  48
  49 #define MIN(a, b) ((a) < (b) ? (a) : (b))
  50
  51 /* options */
  52
  53 static bool option_full_decode = true;
  54 static bool option_print_offsets = true;
  55 static enum { COLOR_AUTO, COLOR_ALWAYS, COLOR_NEVER } option_color;
  56 static char *xml_path = NULL;
  57
  58 static uint32_t
  59 print_head(unsigned int reg)
  60 {
  61    printf("    head = 0x%08x, wraps = %d\n", reg & (0x7ffff<<2), reg >> 21);
  62    return reg & (0x7ffff<<2);
  63 }
  64
  65 static void
  66 print_register(struct gen_spec *spec, const char *name, uint32_t reg)
  67 {
  68    struct gen_group *reg_spec = gen_spec_find_register_by_name(spec, name);
  69
  70    if (reg_spec) {
  71       gen_print_group(stdout, reg_spec, 0, &reg, 0,
  72                       option_color == COLOR_ALWAYS);
  73    }
  74 }
  75
  76 struct ring_register_mapping {
  77    unsigned ring_class;
  78    unsigned ring_instance;
  79    const char *register_name;
  80 };
  81
  82 enum {
  83    RCS,
  84    BCS,
  85    VCS,
  86    VECS,
  87 };
  88
  89 static const struct ring_register_mapping acthd_registers[] = {
  90    { BCS, 0, "BCS_ACTHD_UDW" },
  91    { VCS, 0, "VCS_ACTHD_UDW" },
  92    { VCS, 1, "VCS2_ACTHD_UDW" },
  93    { RCS, 0, "ACTHD_UDW" },
  94    { VECS, 0, "VECS_ACTHD_UDW" },
  95 };
  96
  97 static const struct ring_register_mapping ctl_registers[] = {
  98    { BCS, 0, "BCS_RING_BUFFER_CTL" },
  99    { VCS, 0, "VCS_RING_BUFFER_CTL" },
 100    { VCS, 1, "VCS2_RING_BUFFER_CTL" },
 101    { RCS, 0, "RCS_RING_BUFFER_CTL" },
 102    { VECS, 0,  "VECS_RING_BUFFER_CTL" },
 103 };
 104
 105 static const struct ring_register_mapping fault_registers[] = {
 106    { BCS, 0, "BCS_FAULT_REG" },
 107    { VCS, 0, "VCS_FAULT_REG" },
 108    { RCS, 0, "RCS_FAULT_REG" },
 109    { VECS, 0, "VECS_FAULT_REG" },
 110 };
 111
 112 static int ring_name_to_class(const char *ring_name,
 113                               unsigned int *class)
 114 {
 115    static const char *class_names[] = {
 116       [RCS] = "rcs",
 117       [BCS] = "bcs",
 118       [VCS] = "vcs",
 119       [VECS] = "vecs",
 120    };
 121    for (size_t i = 0; i < ARRAY_SIZE(class_names); i++) {
 122       if (strcmp(ring_name, class_names[i]))
 123          continue;
 124
 125       *class = i;
 126       return atoi(ring_name + strlen(class_names[i]));
 127    }
 128
 129    static const struct {
 130       const char *name;
 131       unsigned int class;
 132       int instance;
 133    } legacy_names[] = {
 134       { "render", RCS, 0 },
 135       { "blt", BCS, 0 },
 136       { "bsd", VCS, 0 },
 137       { "bsd2", VCS, 1 },
 138       { "vebox", VECS, 0 },
 139    };
 140    for (size_t i = 0; i < ARRAY_SIZE(legacy_names); i++) {
 141       if (strcmp(ring_name, legacy_names[i].name))
 142          continue;
 143
 144       *class = legacy_names[i].class;
 145       return legacy_names[i].instance;
 146    }
 147
 148    return -1;
 149 }
 150
 151 static const char *
 152 register_name_from_ring(const struct ring_register_mapping *mapping,
 153                         unsigned nb_mapping,
 154                         const char *ring_name)
 155 {
 156    unsigned int class;
 157    int instance;
 158
 159    instance = ring_name_to_class(ring_name, &class);
 160    if (instance < 0)
 161       return NULL;
 162
 163    for (unsigned i = 0; i < nb_mapping; i++) {
 164       if (mapping[i].ring_class == class &&
 165           mapping[i].ring_instance == instance)
 166          return mapping[i].register_name;
 167    }
 168    return NULL;
 169 }
 170
 171 static const char *
 172 instdone_register_for_ring(const struct gen_device_info *devinfo,
 173                            const char *ring_name)
 174 {
 175    unsigned int class;
 176    int instance;
 177
 178    instance = ring_name_to_class(ring_name, &class);
 179    if (instance < 0)
 180       return NULL;
 181
 182    switch (class) {
 183    case RCS:
 184       if (devinfo->gen == 6)
 185          return "INSTDONE_2";
 186       else
 187          return "INSTDONE_1";
 188
 189    case BCS:
 190       return "BCS_INSTDONE";
 191
 192    case VCS:
 193       switch (instance) {
 194       case 0:
 195          return "VCS_INSTDONE";
 196       case 1:
 197          return "VCS2_INSTDONE";
 198       default:
 199          return NULL;
 200       }
 201
 202    case VECS:
 203       return "VECS_INSTDONE";
 204    }
 205
 206    return NULL;
 207 }
 208
 209 static void
 210 print_pgtbl_err(unsigned int reg, struct gen_device_info *devinfo)
 211 {
 212    if (reg & (1 << 26))
 213       printf("    Invalid Sampler Cache GTT entry\n");
 214    if (reg & (1 << 24))
 215       printf("    Invalid Render Cache GTT entry\n");
 216    if (reg & (1 << 23))
 217       printf("    Invalid Instruction/State Cache GTT entry\n");
 218    if (reg & (1 << 22))
 219       printf("    There is no ROC, this cannot occur!\n");
 220    if (reg & (1 << 21))
 221       printf("    Invalid GTT entry during Vertex Fetch\n");
 222    if (reg & (1 << 20))
 223       printf("    Invalid GTT entry during Command Fetch\n");
 224    if (reg & (1 << 19))
 225       printf("    Invalid GTT entry during CS\n");
 226    if (reg & (1 << 18))
 227       printf("    Invalid GTT entry during Cursor Fetch\n");
 228    if (reg & (1 << 17))
 229       printf("    Invalid GTT entry during Overlay Fetch\n");
 230    if (reg & (1 << 8))
 231       printf("    Invalid GTT entry during Display B Fetch\n");
 232    if (reg & (1 << 4))
 233       printf("    Invalid GTT entry during Display A Fetch\n");
 234    if (reg & (1 << 1))
 235       printf("    Valid PTE references illegal memory\n");
 236    if (reg & (1 << 0))
 237       printf("    Invalid GTT entry during fetch for host\n");
 238 }
 239
 240 static void
 241 print_snb_fence(struct gen_device_info *devinfo, uint64_t fence)
 242 {
 243    printf("    %svalid, %c-tiled, pitch: %i, start: 0x%08x, size: %u\n",
 244           fence & 1 ? "" : "in",
 245           fence & (1<<1) ? 'y' : 'x',
 246           (int)(((fence>>32)&0xfff)+1)*128,
 247           (uint32_t)fence & 0xfffff000,
 248           (uint32_t)(((fence>>32)&0xfffff000) - (fence&0xfffff000) + 4096));
 249 }
 250
 251 static void
 252 print_i965_fence(struct gen_device_info *devinfo, uint64_t fence)
 253 {
 254    printf("    %svalid, %c-tiled, pitch: %i, start: 0x%08x, size: %u\n",
 255           fence & 1 ? "" : "in",
 256           fence & (1<<1) ? 'y' : 'x',
 257           (int)(((fence>>2)&0x1ff)+1)*128,
 258           (uint32_t)fence & 0xfffff000,
 259           (uint32_t)(((fence>>32)&0xfffff000) - (fence&0xfffff000) + 4096));
 260 }
 261
 262 static void
 263 print_fence(struct gen_device_info *devinfo, uint64_t fence)
 264 {
 265    if (devinfo->gen == 6 || devinfo->gen == 7) {
 266       return print_snb_fence(devinfo, fence);
 267    } else if (devinfo->gen == 4 || devinfo->gen == 5) {
 268       return print_i965_fence(devinfo, fence);
 269    }
 270 }
 271
 272 static void
 273 print_fault_data(struct gen_device_info *devinfo, uint32_t data1, uint32_t data0)
 274 {
 275    uint64_t address;
 276
 277    if (devinfo->gen < 8)
 278       return;
 279
 280    address = ((uint64_t)(data0) << 12) | ((uint64_t)data1 & 0xf) << 44;
 281    printf("    Address 0x%016" PRIx64 " %s\n", address,
 282           data1 & (1 << 4) ? "GGTT" : "PPGTT");
 283 }
 284
 285 #define CSI "\e["
 286 #define NORMAL       CSI "0m"
 287
 288 struct section {
 289    uint64_t gtt_offset;
 290    char *ring_name;
 291    const char *buffer_name;
 292    uint32_t *data;
 293    int count;
 294 };
 295
 296 #define MAX_SECTIONS 30
 297 static struct section sections[MAX_SECTIONS];
 298
 299 static int zlib_inflate(uint32_t **ptr, int len)
 300 {
 301    struct z_stream_s zstream;
 302    void *out;
 303    const uint32_t out_size = 128*4096;  /* approximate obj size */
 304
 305    memset(&zstream, 0, sizeof(zstream));
 306
 307    zstream.next_in = (unsigned char *)*ptr;
 308    zstream.avail_in = 4*len;
 309
 310    if (inflateInit(&zstream) != Z_OK)
 311       return 0;
 312
 313    out = malloc(out_size);
 314    zstream.next_out = out;
 315    zstream.avail_out = out_size;
 316
 317    do {
 318       switch (inflate(&zstream, Z_SYNC_FLUSH)) {
 319       case Z_STREAM_END:
 320          goto end;
 321       case Z_OK:
 322          break;
 323       default:
 324          inflateEnd(&zstream);
 325          return 0;
 326       }
 327
 328       if (zstream.avail_out)
 329          break;
 330
 331       out = realloc(out, 2*zstream.total_out);
 332       if (out == NULL) {
 333          inflateEnd(&zstream);
 334          return 0;
 335       }
 336
 337       zstream.next_out = (unsigned char *)out + zstream.total_out;
 338       zstream.avail_out = zstream.total_out;
 339    } while (1);
 340  end:
 341    inflateEnd(&zstream);
 342    free(*ptr);
 343    *ptr = out;
 344    return zstream.total_out / 4;
 345 }
 346
 347 static int ascii85_decode(const char *in, uint32_t **out, bool inflate)
 348 {
 349    int len = 0, size = 1024;
 350
 351    *out = realloc(*out, sizeof(uint32_t)*size);
 352    if (*out == NULL)
 353       return 0;
 354
 355    while (*in >= '!' && *in <= 'z') {
 356       uint32_t v = 0;
 357
 358       if (len == size) {
 359          size *= 2;
 360          *out = realloc(*out, sizeof(uint32_t)*size);
 361          if (*out == NULL)
 362             return 0;
 363       }
 364
 365       if (*in == 'z') {
 366          in++;
 367       } else {
 368          v += in[0] - 33; v *= 85;
 369          v += in[1] - 33; v *= 85;
 370          v += in[2] - 33; v *= 85;
 371          v += in[3] - 33; v *= 85;
 372          v += in[4] - 33;
 373          in += 5;
 374       }
 375       (*out)[len++] = v;
 376    }
 377
 378    if (!inflate)
 379       return len;
 380
 381    return zlib_inflate(out, len);
 382 }
 383
 384 static struct gen_batch_decode_bo
 385 get_gen_batch_bo(void *user_data, uint64_t address)
 386 {
 387    for (int s = 0; s < MAX_SECTIONS; s++) {
 388       if (sections[s].gtt_offset <= address &&
 389           address < sections[s].gtt_offset + sections[s].count) {
 390          return (struct gen_batch_decode_bo) {
 391             .addr = sections[s].gtt_offset,
 392             .map = sections[s].data,
 393             .size = sections[s].count,
 394          };
 395       }
 396    }
 397
 398    return (struct gen_batch_decode_bo) { .map = NULL };
 399 }
 400
 401 static void
 402 read_data_file(FILE *file)
 403 {
 404    struct gen_spec *spec = NULL;
 405    long long unsigned fence;
 406    int matched;
 407    char *line = NULL;
 408    size_t line_size;
 409    uint32_t offset, value;
 410    char *ring_name = NULL;
 411    struct gen_device_info devinfo;
 412    int sect_num = 0;
 413
 414    while (getline(&line, &line_size, file) > 0) {
 415       char *new_ring_name = NULL;
 416       char *dashes;
 417
 418       if (sscanf(line, "%m[^ ] command stream\n", &new_ring_name) > 0) {
 419          free(ring_name);
 420          ring_name = new_ring_name;
 421       }
 422
 423       if (line[0] == ':' || line[0] == '~') {
 424          uint32_t *data = NULL;
 425          int count = ascii85_decode(line+1, &data, line[0] == ':');
 426          if (count == 0) {
 427             fprintf(stderr, "ASCII85 decode failed.\n");
 428             exit(EXIT_FAILURE);
 429          }
 430          sections[sect_num].data = data;
 431          sections[sect_num].count = count;
 432          sect_num++;
 433          continue;
 434       }
 435
 436       dashes = strstr(line, "---");
 437       if (dashes) {
 438          const struct {
 439             const char *match;
 440             const char *name;
 441          } buffers[] = {
 442             { "ringbuffer", "ring buffer" },
 443             { "gtt_offset", "batch buffer" },
 444             { "hw context", "HW Context" },
 445             { "hw status", "HW status" },
 446             { "wa context", "WA context" },
 447             { "wa batchbuffer", "WA batch" },
 448             { "user", "user" },
 449             { "semaphores", "semaphores", },
 450             { "guc log buffer", "GuC log", },
 451             { NULL, "unknown" },
 452          }, *b;
 453
 454          free(ring_name);
 455          ring_name = malloc(dashes - line);
 456          strncpy(ring_name, line, dashes - line);
 457          ring_name[dashes - line - 1] = '\0';
 458
 459          dashes += 4;
 460          for (b = buffers; b->match; b++) {
 461             if (strncasecmp(dashes, b->match, strlen(b->match)) == 0)
 462                break;
 463          }
 464
 465          sections[sect_num].buffer_name = b->name;
 466          sections[sect_num].ring_name = strdup(ring_name);
 467
 468          uint32_t hi, lo;
 469          dashes = strchr(dashes, '=');
 470          if (dashes && sscanf(dashes, "= 0x%08x %08x\n", &hi, &lo))
 471             sections[sect_num].gtt_offset = ((uint64_t) hi) << 32 | lo;
 472
 473          continue;
 474       }
 475
 476       matched = sscanf(line, "%08x : %08x", &offset, &value);
 477       if (matched != 2) {
 478          uint32_t reg, reg2;
 479
 480          /* display reg section is after the ringbuffers, don't mix them */
 481          printf("%s", line);
 482
 483          matched = sscanf(line, "PCI ID: 0x%04x\n", &reg);
 484          if (matched == 0)
 485             matched = sscanf(line, " PCI ID: 0x%04x\n", &reg);
 486          if (matched == 0) {
 487             const char *pci_id_start = strstr(line, "PCI ID");
 488             if (pci_id_start)
 489                matched = sscanf(pci_id_start, "PCI ID: 0x%04x\n", &reg);
 490          }
 491          if (matched == 1) {
 492             if (!gen_get_device_info(reg, &devinfo)) {
 493                printf("Unable to identify devid=%x\n", reg);
 494                exit(EXIT_FAILURE);
 495             }
 496
 497             printf("Detected GEN%i chipset\n", devinfo.gen);
 498
 499             if (xml_path == NULL)
 500                spec = gen_spec_load(&devinfo);
 501             else
 502                spec = gen_spec_load_from_path(&devinfo, xml_path);
 503          }
 504
 505          matched = sscanf(line, "  CTL: 0x%08x\n", &reg);
 506          if (matched == 1) {
 507             print_register(spec,
 508                            register_name_from_ring(ctl_registers,
 509                                                    ARRAY_SIZE(ctl_registers),
 510                                                    ring_name), reg);
 511          }
 512
 513          matched = sscanf(line, "  HEAD: 0x%08x\n", &reg);
 514          if (matched == 1)
 515             print_head(reg);
 516
 517          matched = sscanf(line, "  ACTHD: 0x%08x\n", &reg);
 518          if (matched == 1) {
 519             print_register(spec,
 520                            register_name_from_ring(acthd_registers,
 521                                                    ARRAY_SIZE(acthd_registers),
 522                                                    ring_name), reg);
 523          }
 524
 525          matched = sscanf(line, "  PGTBL_ER: 0x%08x\n", &reg);
 526          if (matched == 1 && reg)
 527             print_pgtbl_err(reg, &devinfo);
 528
 529          matched = sscanf(line, "  ERROR: 0x%08x\n", &reg);
 530          if (matched == 1 && reg) {
 531             print_register(spec, "GFX_ARB_ERROR_RPT", reg);
 532          }
 533
 534          matched = sscanf(line, "  INSTDONE: 0x%08x\n", &reg);
 535          if (matched == 1) {
 536             const char *reg_name =
 537                instdone_register_for_ring(&devinfo, ring_name);
 538             if (reg_name)
 539                print_register(spec, reg_name, reg);
 540          }
 541
 542          matched = sscanf(line, "  INSTDONE1: 0x%08x\n", &reg);
 543          if (matched == 1)
 544             print_register(spec, "INSTDONE_1", reg);
 545
 546          matched = sscanf(line, "  fence[%i] = %Lx\n", &reg, &fence);
 547          if (matched == 2)
 548             print_fence(&devinfo, fence);
 549
 550          matched = sscanf(line, "  FAULT_REG: 0x%08x\n", &reg);
 551          if (matched == 1 && reg) {
 552             const char *reg_name =
 553                register_name_from_ring(fault_registers,
 554                                        ARRAY_SIZE(fault_registers),
 555                                        ring_name);
 556             if (reg_name == NULL)
 557                reg_name = "FAULT_REG";
 558             print_register(spec, reg_name, reg);
 559          }
 560
 561          matched = sscanf(line, "  FAULT_TLB_DATA: 0x%08x 0x%08x\n", &reg, &reg2);
 562          if (matched == 2)
 563             print_fault_data(&devinfo, reg, reg2);
 564
 565          continue;
 566       }
 567    }
 568
 569    free(line);
 570    free(ring_name);
 571
 572    enum gen_batch_decode_flags batch_flags = 0;
 573    if (option_color == COLOR_ALWAYS)
 574       batch_flags |= GEN_BATCH_DECODE_IN_COLOR;
 575    if (option_full_decode)
 576       batch_flags |= GEN_BATCH_DECODE_FULL;
 577    if (option_print_offsets)
 578       batch_flags |= GEN_BATCH_DECODE_OFFSETS;
 579    batch_flags |= GEN_BATCH_DECODE_FLOATS;
 580
 581    struct gen_batch_decode_ctx batch_ctx;
 582    gen_batch_decode_ctx_init(&batch_ctx, &devinfo, stdout, batch_flags,
 583                              xml_path, get_gen_batch_bo, NULL);
 584
 585
 586    for (int s = 0; s < sect_num; s++) {
 587       printf("--- %s (%s) at 0x%08x %08x\n",
 588              sections[s].buffer_name, sections[s].ring_name,
 589              (unsigned) (sections[s].gtt_offset >> 32),
 590              (unsigned) sections[s].gtt_offset);
 591
 592       if (strcmp(sections[s].buffer_name, "batch buffer") == 0 ||
 593           strcmp(sections[s].buffer_name, "ring buffer") == 0 ||
 594           strcmp(sections[s].buffer_name, "HW Context") == 0) {
 595          gen_print_batch(&batch_ctx, sections[s].data, sections[s].count,
 596                          sections[s].gtt_offset);
 597       }
 598    }
 599
 600    gen_batch_decode_ctx_finish(&batch_ctx);
 601
 602    for (int s = 0; s < sect_num; s++) {
 603       free(sections[s].ring_name);
 604       free(sections[s].data);
 605    }
 606 }
 607
 608 static void
 609 setup_pager(void)
 610 {
 611    int fds[2];
 612    pid_t pid;
 613
 614    if (!isatty(1))
 615       return;
 616
 617    if (pipe(fds) == -1)
 618       return;
 619
 620    pid = fork();
 621    if (pid == -1)
 622       return;
 623
 624    if (pid == 0) {
 625       close(fds[1]);
 626       dup2(fds[0], 0);
 627       execlp("less", "less", "-FRSi", NULL);
 628    }
 629
 630    close(fds[0]);
 631    dup2(fds[1], 1);
 632    close(fds[1]);
 633 }
 634
 635 static void
 636 print_help(const char *progname, FILE *file)
 637 {
 638    fprintf(file,
 639            "Usage: %s [OPTION]... [FILE]\n"
 640            "Parse an Intel GPU i915_error_state.\n"
 641            "With no FILE, debugfs-dri-directory is probed for in /debug and \n"
 642            "/sys/kernel/debug.  Otherwise, it may be specified. If a file is given,\n"
 643            "it is parsed as an GPU dump in the format of /debug/dri/0/i915_error_state.\n\n"
 644            "      --help          display this help and exit\n"
 645            "      --headers       decode only command headers\n"
 646            "      --color[=WHEN]  colorize the output; WHEN can be 'auto' (default\n"
 647            "                        if omitted), 'always', or 'never'\n"
 648            "      --no-pager      don't launch pager\n"
 649            "      --no-offsets    don't print instruction offsets\n"
 650            "      --xml=DIR       load hardware xml description from directory DIR\n",
 651            progname);
 652 }
 653
 654 int
 655 main(int argc, char *argv[])
 656 {
 657    FILE *file;
 658    const char *path;
 659    struct stat st;
 660    int c, i, error;
 661    bool help = false, pager = true;
 662    const struct option aubinator_opts[] = {
 663       { "help",       no_argument,       (int *) &help,                 true },
 664       { "no-pager",   no_argument,       (int *) &pager,                false },
 665       { "no-offsets", no_argument,       (int *) &option_print_offsets, false },
 666       { "headers",    no_argument,       (int *) &option_full_decode,   false },
 667       { "color",      required_argument, NULL,                          'c' },
 668       { "xml",        required_argument, NULL,                          'x' },
 669       { NULL,         0,                 NULL,                          0 }
 670    };
 671
 672    i = 0;
 673    while ((c = getopt_long(argc, argv, "", aubinator_opts, &i)) != -1) {
 674       switch (c) {
 675       case 'c':
 676          if (optarg == NULL || strcmp(optarg, "always") == 0)
 677             option_color = COLOR_ALWAYS;
 678          else if (strcmp(optarg, "never") == 0)
 679             option_color = COLOR_NEVER;
 680          else if (strcmp(optarg, "auto") == 0)
 681             option_color = COLOR_AUTO;
 682          else {
 683             fprintf(stderr, "invalid value for --color: %s", optarg);
 684             exit(EXIT_FAILURE);
 685          }
 686          break;
 687       case 'x':
 688          xml_path = strdup(optarg);
 689          break;
 690       default:
 691          break;
 692       }
 693    }
 694
 695    if (help || argc == 1) {
 696       print_help(argv[0], stderr);
 697       exit(EXIT_SUCCESS);
 698    }
 699
 700    if (optind >= argc) {
 701       if (isatty(0)) {
 702          path = "/sys/class/drm/card0/error";
 703          error = stat(path, &st);
 704          if (error != 0) {
 705             path = "/debug/dri";
 706             error = stat(path, &st);
 707          }
 708          if (error != 0) {
 709             path = "/sys/kernel/debug/dri";
 710             error = stat(path, &st);
 711          }
 712          if (error != 0) {
 713             errx(1,
 714                  "Couldn't find i915 debugfs directory.\n\n"
 715                  "Is debugfs mounted? You might try mounting it with a command such as:\n\n"
 716                  "\tsudo mount -t debugfs debugfs /sys/kernel/debug\n");
 717          }
 718       } else {
 719          read_data_file(stdin);
 720          exit(EXIT_SUCCESS);
 721       }
 722    } else {
 723       path = argv[optind];
 724       error = stat(path, &st);
 725       if (error != 0) {
 726          fprintf(stderr, "Error opening %s: %s\n",
 727                  path, strerror(errno));
 728          exit(EXIT_FAILURE);
 729       }
 730    }
 731
 732    if (option_color == COLOR_AUTO)
 733       option_color = isatty(1) ? COLOR_ALWAYS : COLOR_NEVER;
 734
 735    if (isatty(1) && pager)
 736       setup_pager();
 737
 738    if (S_ISDIR(st.st_mode)) {
 739       int ret;
 740       char *filename;
 741
 742       ret = asprintf(&filename, "%s/i915_error_state", path);
 743       assert(ret > 0);
 744       file = fopen(filename, "r");
 745       if (!file) {
 746          int minor;
 747          free(filename);
 748          for (minor = 0; minor < 64; minor++) {
 749             ret = asprintf(&filename, "%s/%d/i915_error_state", path, minor);
 750             assert(ret > 0);
 751
 752             file = fopen(filename, "r");
 753             if (file)
 754                break;
 755
 756             free(filename);
 757          }
 758       }
 759       if (!file) {
 760          fprintf(stderr, "Failed to find i915_error_state beneath %s\n",
 761                  path);
 762          return EXIT_FAILURE;
 763       }
 764    } else {
 765       file = fopen(path, "r");
 766       if (!file) {
 767          fprintf(stderr, "Failed to open %s: %s\n",
 768                  path, strerror(errno));
 769          return EXIT_FAILURE;
 770       }
 771    }
 772
 773    read_data_file(file);
 774    fclose(file);
 775
 776    /* close the stdout which is opened to write the output */
 777    fflush(stdout);
 778    close(1);
 779    wait(NULL);
 780
 781    if (xml_path)
 782       free(xml_path);
 783
 784    return EXIT_SUCCESS;
 785 }
 786
 787 /* vim: set ts=8 sw=8 tw=0 cino=:0,(0 noet :*/