drivers/gpu/drm/i915/i915_gpu_error.c

   1 /*
   2  * Copyright (c) 2008 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  * Authors:
  24  *    Eric Anholt <[email protected]>
  25  *    Keith Packard <[email protected]>
  26  *    Mika Kuoppala <[email protected]>
  27  *
  28  */
  29
  30 #include <generated/utsrelease.h>
  31 #include <linux/stop_machine.h>
  32 #include <linux/zlib.h>
  33 #include "i915_drv.h"
  34
  35 static const char *engine_str(int engine)
  36 {
  37         switch (engine) {
  38         case RCS: return "render";
  39         case VCS: return "bsd";
  40         case BCS: return "blt";
  41         case VECS: return "vebox";
  42         case VCS2: return "bsd2";
  43         default: return "";
  44         }
  45 }
  46
  47 static const char *tiling_flag(int tiling)
  48 {
  49         switch (tiling) {
  50         default:
  51         case I915_TILING_NONE: return "";
  52         case I915_TILING_X: return " X";
  53         case I915_TILING_Y: return " Y";
  54         }
  55 }
  56
  57 static const char *dirty_flag(int dirty)
  58 {
  59         return dirty ? " dirty" : "";
  60 }
  61
  62 static const char *purgeable_flag(int purgeable)
  63 {
  64         return purgeable ? " purgeable" : "";
  65 }
  66
  67 static bool __i915_error_ok(struct drm_i915_error_state_buf *e)
  68 {
  69
  70         if (!e->err && WARN(e->bytes > (e->size - 1), "overflow")) {
  71                 e->err = -ENOSPC;
  72                 return false;
  73         }
  74
  75         if (e->bytes == e->size - 1 || e->err)
  76                 return false;
  77
  78         return true;
  79 }
  80
  81 static bool __i915_error_seek(struct drm_i915_error_state_buf *e,
  82                               unsigned len)
  83 {
  84         if (e->pos + len <= e->start) {
  85                 e->pos += len;
  86                 return false;
  87         }
  88
  89         /* First vsnprintf needs to fit in its entirety for memmove */
  90         if (len >= e->size) {
  91                 e->err = -EIO;
  92                 return false;
  93         }
  94
  95         return true;
  96 }
  97
  98 static void __i915_error_advance(struct drm_i915_error_state_buf *e,
  99                                  unsigned len)
 100 {
 101         /* If this is first printf in this window, adjust it so that
 102          * start position matches start of the buffer
 103          */
 104
 105         if (e->pos < e->start) {
 106                 const size_t off = e->start - e->pos;
 107
 108                 /* Should not happen but be paranoid */
 109                 if (off > len || e->bytes) {
 110                         e->err = -EIO;
 111                         return;
 112                 }
 113
 114                 memmove(e->buf, e->buf + off, len - off);
 115                 e->bytes = len - off;
 116                 e->pos = e->start;
 117                 return;
 118         }
 119
 120         e->bytes += len;
 121         e->pos += len;
 122 }
 123
 124 __printf(2, 0)
 125 static void i915_error_vprintf(struct drm_i915_error_state_buf *e,
 126                                const char *f, va_list args)
 127 {
 128         unsigned len;
 129
 130         if (!__i915_error_ok(e))
 131                 return;
 132
 133         /* Seek the first printf which is hits start position */
 134         if (e->pos < e->start) {
 135                 va_list tmp;
 136
 137                 va_copy(tmp, args);
 138                 len = vsnprintf(NULL, 0, f, tmp);
 139                 va_end(tmp);
 140
 141                 if (!__i915_error_seek(e, len))
 142                         return;
 143         }
 144
 145         len = vsnprintf(e->buf + e->bytes, e->size - e->bytes, f, args);
 146         if (len >= e->size - e->bytes)
 147                 len = e->size - e->bytes - 1;
 148
 149         __i915_error_advance(e, len);
 150 }
 151
 152 static void i915_error_puts(struct drm_i915_error_state_buf *e,
 153                             const char *str)
 154 {
 155         unsigned len;
 156
 157         if (!__i915_error_ok(e))
 158                 return;
 159
 160         len = strlen(str);
 161
 162         /* Seek the first printf which is hits start position */
 163         if (e->pos < e->start) {
 164                 if (!__i915_error_seek(e, len))
 165                         return;
 166         }
 167
 168         if (len >= e->size - e->bytes)
 169                 len = e->size - e->bytes - 1;
 170         memcpy(e->buf + e->bytes, str, len);
 171
 172         __i915_error_advance(e, len);
 173 }
 174
 175 #define err_printf(e, ...) i915_error_printf(e, __VA_ARGS__)
 176 #define err_puts(e, s) i915_error_puts(e, s)
 177
 178 #ifdef CONFIG_DRM_I915_COMPRESS_ERROR
 179
 180 struct compress {
 181         struct z_stream_s zstream;
 182         void *tmp;
 183 };
 184
 185 static bool compress_init(struct compress *c)
 186 {
 187         struct z_stream_s *zstream = memset(&c->zstream, 0, sizeof(c->zstream));
 188
 189         zstream->workspace =
 190                 kmalloc(zlib_deflate_workspacesize(MAX_WBITS, MAX_MEM_LEVEL),
 191                         GFP_ATOMIC | __GFP_NOWARN);
 192         if (!zstream->workspace)
 193                 return false;
 194
 195         if (zlib_deflateInit(zstream, Z_DEFAULT_COMPRESSION) != Z_OK) {
 196                 kfree(zstream->workspace);
 197                 return false;
 198         }
 199
 200         c->tmp = NULL;
 201         if (i915_has_memcpy_from_wc())
 202                 c->tmp = (void *)__get_free_page(GFP_ATOMIC | __GFP_NOWARN);
 203
 204         return true;
 205 }
 206
 207 static int compress_page(struct compress *c,
 208                          void *src,
 209                          struct drm_i915_error_object *dst)
 210 {
 211         struct z_stream_s *zstream = &c->zstream;
 212
 213         zstream->next_in = src;
 214         if (c->tmp && i915_memcpy_from_wc(c->tmp, src, PAGE_SIZE))
 215                 zstream->next_in = c->tmp;
 216         zstream->avail_in = PAGE_SIZE;
 217
 218         do {
 219                 if (zstream->avail_out == 0) {
 220                         unsigned long page;
 221
 222                         page = __get_free_page(GFP_ATOMIC | __GFP_NOWARN);
 223                         if (!page)
 224                                 return -ENOMEM;
 225
 226                         dst->pages[dst->page_count++] = (void *)page;
 227
 228                         zstream->next_out = (void *)page;
 229                         zstream->avail_out = PAGE_SIZE;
 230                 }
 231
 232                 if (zlib_deflate(zstream, Z_SYNC_FLUSH) != Z_OK)
 233                         return -EIO;
 234         } while (zstream->avail_in);
 235
 236         /* Fallback to uncompressed if we increase size? */
 237         if (0 && zstream->total_out > zstream->total_in)
 238                 return -E2BIG;
 239
 240         return 0;
 241 }
 242
 243 static void compress_fini(struct compress *c,
 244                           struct drm_i915_error_object *dst)
 245 {
 246         struct z_stream_s *zstream = &c->zstream;
 247
 248         if (dst) {
 249                 zlib_deflate(zstream, Z_FINISH);
 250                 dst->unused = zstream->avail_out;
 251         }
 252
 253         zlib_deflateEnd(zstream);
 254         kfree(zstream->workspace);
 255
 256         if (c->tmp)
 257                 free_page((unsigned long)c->tmp);
 258 }
 259
 260 static void err_compression_marker(struct drm_i915_error_state_buf *m)
 261 {
 262         err_puts(m, ":");
 263 }
 264
 265 #else
 266
 267 struct compress {
 268 };
 269
 270 static bool compress_init(struct compress *c)
 271 {
 272         return true;
 273 }
 274
 275 static int compress_page(struct compress *c,
 276                          void *src,
 277                          struct drm_i915_error_object *dst)
 278 {
 279         unsigned long page;
 280         void *ptr;
 281
 282         page = __get_free_page(GFP_ATOMIC | __GFP_NOWARN);
 283         if (!page)
 284                 return -ENOMEM;
 285
 286         ptr = (void *)page;
 287         if (!i915_memcpy_from_wc(ptr, src, PAGE_SIZE))
 288                 memcpy(ptr, src, PAGE_SIZE);
 289         dst->pages[dst->page_count++] = ptr;
 290
 291         return 0;
 292 }
 293
 294 static void compress_fini(struct compress *c,
 295                           struct drm_i915_error_object *dst)
 296 {
 297 }
 298
 299 static void err_compression_marker(struct drm_i915_error_state_buf *m)
 300 {
 301         err_puts(m, "~");
 302 }
 303
 304 #endif
 305
 306 static void print_error_buffers(struct drm_i915_error_state_buf *m,
 307                                 const char *name,
 308                                 struct drm_i915_error_buffer *err,
 309                                 int count)
 310 {
 311         int i;
 312
 313         err_printf(m, "%s [%d]:\n", name, count);
 314
 315         while (count--) {
 316                 err_printf(m, "    %08x_%08x %8u %02x %02x [ ",
 317                            upper_32_bits(err->gtt_offset),
 318                            lower_32_bits(err->gtt_offset),
 319                            err->size,
 320                            err->read_domains,
 321                            err->write_domain);
 322                 for (i = 0; i < I915_NUM_ENGINES; i++)
 323                         err_printf(m, "%02x ", err->rseqno[i]);
 324
 325                 err_printf(m, "] %02x", err->wseqno);
 326                 err_puts(m, tiling_flag(err->tiling));
 327                 err_puts(m, dirty_flag(err->dirty));
 328                 err_puts(m, purgeable_flag(err->purgeable));
 329                 err_puts(m, err->userptr ? " userptr" : "");
 330                 err_puts(m, err->engine != -1 ? " " : "");
 331                 err_puts(m, engine_str(err->engine));
 332                 err_puts(m, i915_cache_level_str(m->i915, err->cache_level));
 333
 334                 if (err->name)
 335                         err_printf(m, " (name: %d)", err->name);
 336                 if (err->fence_reg != I915_FENCE_REG_NONE)
 337                         err_printf(m, " (fence: %d)", err->fence_reg);
 338
 339                 err_puts(m, "\n");
 340                 err++;
 341         }
 342 }
 343
 344 static void error_print_instdone(struct drm_i915_error_state_buf *m,
 345                                  struct drm_i915_error_engine *ee)
 346 {
 347         int slice;
 348         int subslice;
 349
 350         err_printf(m, "  INSTDONE: 0x%08x\n",
 351                    ee->instdone.instdone);
 352
 353         if (ee->engine_id != RCS || INTEL_GEN(m->i915) <= 3)
 354                 return;
 355
 356         err_printf(m, "  SC_INSTDONE: 0x%08x\n",
 357                    ee->instdone.slice_common);
 358
 359         if (INTEL_GEN(m->i915) <= 6)
 360                 return;
 361
 362         for_each_instdone_slice_subslice(m->i915, slice, subslice)
 363                 err_printf(m, "  SAMPLER_INSTDONE[%d][%d]: 0x%08x\n",
 364                            slice, subslice,
 365                            ee->instdone.sampler[slice][subslice]);
 366
 367         for_each_instdone_slice_subslice(m->i915, slice, subslice)
 368                 err_printf(m, "  ROW_INSTDONE[%d][%d]: 0x%08x\n",
 369                            slice, subslice,
 370                            ee->instdone.row[slice][subslice]);
 371 }
 372
 373 static void error_print_request(struct drm_i915_error_state_buf *m,
 374                                 const char *prefix,
 375                                 struct drm_i915_error_request *erq)
 376 {
 377         if (!erq->seqno)
 378                 return;
 379
 380         err_printf(m, "%s pid %d, ban score %d, seqno %8x:%08x, emitted %dms ago, head %08x, tail %08x\n",
 381                    prefix, erq->pid, erq->ban_score,
 382                    erq->context, erq->seqno,
 383                    jiffies_to_msecs(jiffies - erq->jiffies),
 384                    erq->head, erq->tail);
 385 }
 386
 387 static void error_print_engine(struct drm_i915_error_state_buf *m,
 388                                struct drm_i915_error_engine *ee)
 389 {
 390         err_printf(m, "%s command stream:\n", engine_str(ee->engine_id));
 391         err_printf(m, "  START: 0x%08x\n", ee->start);
 392         err_printf(m, "  HEAD:  0x%08x [0x%08x]\n", ee->head, ee->rq_head);
 393         err_printf(m, "  TAIL:  0x%08x [0x%08x, 0x%08x]\n",
 394                    ee->tail, ee->rq_post, ee->rq_tail);
 395         err_printf(m, "  CTL:   0x%08x\n", ee->ctl);
 396         err_printf(m, "  MODE:  0x%08x\n", ee->mode);
 397         err_printf(m, "  HWS:   0x%08x\n", ee->hws);
 398         err_printf(m, "  ACTHD: 0x%08x %08x\n",
 399                    (u32)(ee->acthd>>32), (u32)ee->acthd);
 400         err_printf(m, "  IPEIR: 0x%08x\n", ee->ipeir);
 401         err_printf(m, "  IPEHR: 0x%08x\n", ee->ipehr);
 402
 403         error_print_instdone(m, ee);
 404
 405         if (ee->batchbuffer) {
 406                 u64 start = ee->batchbuffer->gtt_offset;
 407                 u64 end = start + ee->batchbuffer->gtt_size;
 408
 409                 err_printf(m, "  batch: [0x%08x_%08x, 0x%08x_%08x]\n",
 410                            upper_32_bits(start), lower_32_bits(start),
 411                            upper_32_bits(end), lower_32_bits(end));
 412         }
 413         if (INTEL_GEN(m->i915) >= 4) {
 414                 err_printf(m, "  BBADDR: 0x%08x_%08x\n",
 415                            (u32)(ee->bbaddr>>32), (u32)ee->bbaddr);
 416                 err_printf(m, "  BB_STATE: 0x%08x\n", ee->bbstate);
 417                 err_printf(m, "  INSTPS: 0x%08x\n", ee->instps);
 418         }
 419         err_printf(m, "  INSTPM: 0x%08x\n", ee->instpm);
 420         err_printf(m, "  FADDR: 0x%08x %08x\n", upper_32_bits(ee->faddr),
 421                    lower_32_bits(ee->faddr));
 422         if (INTEL_GEN(m->i915) >= 6) {
 423                 err_printf(m, "  RC PSMI: 0x%08x\n", ee->rc_psmi);
 424                 err_printf(m, "  FAULT_REG: 0x%08x\n", ee->fault_reg);
 425                 err_printf(m, "  SYNC_0: 0x%08x\n",
 426                            ee->semaphore_mboxes[0]);
 427                 err_printf(m, "  SYNC_1: 0x%08x\n",
 428                            ee->semaphore_mboxes[1]);
 429                 if (HAS_VEBOX(m->i915))
 430                         err_printf(m, "  SYNC_2: 0x%08x\n",
 431                                    ee->semaphore_mboxes[2]);
 432         }
 433         if (USES_PPGTT(m->i915)) {
 434                 err_printf(m, "  GFX_MODE: 0x%08x\n", ee->vm_info.gfx_mode);
 435
 436                 if (INTEL_GEN(m->i915) >= 8) {
 437                         int i;
 438                         for (i = 0; i < 4; i++)
 439                                 err_printf(m, "  PDP%d: 0x%016llx\n",
 440                                            i, ee->vm_info.pdp[i]);
 441                 } else {
 442                         err_printf(m, "  PP_DIR_BASE: 0x%08x\n",
 443                                    ee->vm_info.pp_dir_base);
 444                 }
 445         }
 446         err_printf(m, "  seqno: 0x%08x\n", ee->seqno);
 447         err_printf(m, "  last_seqno: 0x%08x\n", ee->last_seqno);
 448         err_printf(m, "  waiting: %s\n", yesno(ee->waiting));
 449         err_printf(m, "  ring->head: 0x%08x\n", ee->cpu_ring_head);
 450         err_printf(m, "  ring->tail: 0x%08x\n", ee->cpu_ring_tail);
 451         err_printf(m, "  hangcheck stall: %s\n", yesno(ee->hangcheck_stalled));
 452         err_printf(m, "  hangcheck action: %s\n",
 453                    hangcheck_action_to_str(ee->hangcheck_action));
 454         err_printf(m, "  hangcheck action timestamp: %lu, %u ms ago\n",
 455                    ee->hangcheck_timestamp,
 456                    jiffies_to_msecs(jiffies - ee->hangcheck_timestamp));
 457
 458         error_print_request(m, "  ELSP[0]: ", &ee->execlist[0]);
 459         error_print_request(m, "  ELSP[1]: ", &ee->execlist[1]);
 460 }
 461
 462 void i915_error_printf(struct drm_i915_error_state_buf *e, const char *f, ...)
 463 {
 464         va_list args;
 465
 466         va_start(args, f);
 467         i915_error_vprintf(e, f, args);
 468         va_end(args);
 469 }
 470
 471 static int
 472 ascii85_encode_len(int len)
 473 {
 474         return DIV_ROUND_UP(len, 4);
 475 }
 476
 477 static bool
 478 ascii85_encode(u32 in, char *out)
 479 {
 480         int i;
 481
 482         if (in == 0)
 483                 return false;
 484
 485         out[5] = '\0';
 486         for (i = 5; i--; ) {
 487                 out[i] = '!' + in % 85;
 488                 in /= 85;
 489         }
 490
 491         return true;
 492 }
 493
 494 static void print_error_obj(struct drm_i915_error_state_buf *m,
 495                             struct intel_engine_cs *engine,
 496                             const char *name,
 497                             struct drm_i915_error_object *obj)
 498 {
 499         char out[6];
 500         int page;
 501
 502         if (!obj)
 503                 return;
 504
 505         if (name) {
 506                 err_printf(m, "%s --- %s = 0x%08x %08x\n",
 507                            engine ? engine->name : "global", name,
 508                            upper_32_bits(obj->gtt_offset),
 509                            lower_32_bits(obj->gtt_offset));
 510         }
 511
 512         err_compression_marker(m);
 513         for (page = 0; page < obj->page_count; page++) {
 514                 int i, len;
 515
 516                 len = PAGE_SIZE;
 517                 if (page == obj->page_count - 1)
 518                         len -= obj->unused;
 519                 len = ascii85_encode_len(len);
 520
 521                 for (i = 0; i < len; i++) {
 522                         if (ascii85_encode(obj->pages[page][i], out))
 523                                 err_puts(m, out);
 524                         else
 525                                 err_puts(m, "z");
 526                 }
 527         }
 528         err_puts(m, "\n");
 529 }
 530
 531 static void err_print_capabilities(struct drm_i915_error_state_buf *m,
 532                                    const struct intel_device_info *info)
 533 {
 534 #define PRINT_FLAG(x)  err_printf(m, #x ": %s\n", yesno(info->x))
 535         DEV_INFO_FOR_EACH_FLAG(PRINT_FLAG);
 536 #undef PRINT_FLAG
 537 }
 538
 539 int i915_error_state_to_str(struct drm_i915_error_state_buf *m,
 540                             const struct i915_error_state_file_priv *error_priv)
 541 {
 542         struct drm_i915_private *dev_priv = error_priv->i915;
 543         struct pci_dev *pdev = dev_priv->drm.pdev;
 544         struct drm_i915_error_state *error = error_priv->error;
 545         struct drm_i915_error_object *obj;
 546         int i, j;
 547
 548         if (!error) {
 549                 err_printf(m, "no error state collected\n");
 550                 goto out;
 551         }
 552
 553         err_printf(m, "%s\n", error->error_msg);
 554         err_printf(m, "Kernel: " UTS_RELEASE "\n");
 555         err_printf(m, "Time: %ld s %ld us\n",
 556                    error->time.tv_sec, error->time.tv_usec);
 557         err_printf(m, "Boottime: %ld s %ld us\n",
 558                    error->boottime.tv_sec, error->boottime.tv_usec);
 559         err_printf(m, "Uptime: %ld s %ld us\n",
 560                    error->uptime.tv_sec, error->uptime.tv_usec);
 561         err_print_capabilities(m, &error->device_info);
 562
 563         for (i = 0; i < ARRAY_SIZE(error->engine); i++) {
 564                 if (error->engine[i].hangcheck_stalled &&
 565                     error->engine[i].pid != -1) {
 566                         err_printf(m, "Active process (on ring %s): %s [%d], context bans %d\n",
 567                                    engine_str(i),
 568                                    error->engine[i].comm,
 569                                    error->engine[i].pid,
 570                                    error->engine[i].context_bans);
 571                 }
 572         }
 573         err_printf(m, "Reset count: %u\n", error->reset_count);
 574         err_printf(m, "Suspend count: %u\n", error->suspend_count);
 575         err_printf(m, "Platform: %s\n", intel_platform_name(error->device_info.platform));
 576         err_printf(m, "PCI ID: 0x%04x\n", pdev->device);
 577         err_printf(m, "PCI Revision: 0x%02x\n", pdev->revision);
 578         err_printf(m, "PCI Subsystem: %04x:%04x\n",
 579                    pdev->subsystem_vendor,
 580                    pdev->subsystem_device);
 581         err_printf(m, "IOMMU enabled?: %d\n", error->iommu);
 582
 583         if (HAS_CSR(dev_priv)) {
 584                 struct intel_csr *csr = &dev_priv->csr;
 585
 586                 err_printf(m, "DMC loaded: %s\n",
 587                            yesno(csr->dmc_payload != NULL));
 588                 err_printf(m, "DMC fw version: %d.%d\n",
 589                            CSR_VERSION_MAJOR(csr->version),
 590                            CSR_VERSION_MINOR(csr->version));
 591         }
 592
 593         err_printf(m, "EIR: 0x%08x\n", error->eir);
 594         err_printf(m, "IER: 0x%08x\n", error->ier);
 595         if (INTEL_GEN(dev_priv) >= 8) {
 596                 for (i = 0; i < 4; i++)
 597                         err_printf(m, "GTIER gt %d: 0x%08x\n", i,
 598                                    error->gtier[i]);
 599         } else if (HAS_PCH_SPLIT(dev_priv) || IS_VALLEYVIEW(dev_priv))
 600                 err_printf(m, "GTIER: 0x%08x\n", error->gtier[0]);
 601         err_printf(m, "PGTBL_ER: 0x%08x\n", error->pgtbl_er);
 602         err_printf(m, "FORCEWAKE: 0x%08x\n", error->forcewake);
 603         err_printf(m, "DERRMR: 0x%08x\n", error->derrmr);
 604         err_printf(m, "CCID: 0x%08x\n", error->ccid);
 605         err_printf(m, "Missed interrupts: 0x%08lx\n", dev_priv->gpu_error.missed_irq_rings);
 606
 607         for (i = 0; i < dev_priv->num_fence_regs; i++)
 608                 err_printf(m, "  fence[%d] = %08llx\n", i, error->fence[i]);
 609
 610         if (INTEL_GEN(dev_priv) >= 6) {
 611                 err_printf(m, "ERROR: 0x%08x\n", error->error);
 612
 613                 if (INTEL_GEN(dev_priv) >= 8)
 614                         err_printf(m, "FAULT_TLB_DATA: 0x%08x 0x%08x\n",
 615                                    error->fault_data1, error->fault_data0);
 616
 617                 err_printf(m, "DONE_REG: 0x%08x\n", error->done_reg);
 618         }
 619
 620         if (IS_GEN7(dev_priv))
 621                 err_printf(m, "ERR_INT: 0x%08x\n", error->err_int);
 622
 623         for (i = 0; i < ARRAY_SIZE(error->engine); i++) {
 624                 if (error->engine[i].engine_id != -1)
 625                         error_print_engine(m, &error->engine[i]);
 626         }
 627
 628         for (i = 0; i < ARRAY_SIZE(error->active_vm); i++) {
 629                 char buf[128];
 630                 int len, first = 1;
 631
 632                 if (!error->active_vm[i])
 633                         break;
 634
 635                 len = scnprintf(buf, sizeof(buf), "Active (");
 636                 for (j = 0; j < ARRAY_SIZE(error->engine); j++) {
 637                         if (error->engine[j].vm != error->active_vm[i])
 638                                 continue;
 639
 640                         len += scnprintf(buf + len, sizeof(buf), "%s%s",
 641                                          first ? "" : ", ",
 642                                          dev_priv->engine[j]->name);
 643                         first = 0;
 644                 }
 645                 scnprintf(buf + len, sizeof(buf), ")");
 646                 print_error_buffers(m, buf,
 647                                     error->active_bo[i],
 648                                     error->active_bo_count[i]);
 649         }
 650
 651         print_error_buffers(m, "Pinned (global)",
 652                             error->pinned_bo,
 653                             error->pinned_bo_count);
 654
 655         for (i = 0; i < ARRAY_SIZE(error->engine); i++) {
 656                 struct drm_i915_error_engine *ee = &error->engine[i];
 657
 658                 obj = ee->batchbuffer;
 659                 if (obj) {
 660                         err_puts(m, dev_priv->engine[i]->name);
 661                         if (ee->pid != -1)
 662                                 err_printf(m, " (submitted by %s [%d], bans %d)",
 663                                            ee->comm,
 664                                            ee->pid,
 665                                            ee->context_bans);
 666                         err_printf(m, " --- gtt_offset = 0x%08x %08x\n",
 667                                    upper_32_bits(obj->gtt_offset),
 668                                    lower_32_bits(obj->gtt_offset));
 669                         print_error_obj(m, dev_priv->engine[i], NULL, obj);
 670                 }
 671
 672                 if (ee->num_requests) {
 673                         err_printf(m, "%s --- %d requests\n",
 674                                    dev_priv->engine[i]->name,
 675                                    ee->num_requests);
 676                         for (j = 0; j < ee->num_requests; j++)
 677                                 error_print_request(m, " ", &ee->requests[j]);
 678                 }
 679
 680                 if (IS_ERR(ee->waiters)) {
 681                         err_printf(m, "%s --- ? waiters [unable to acquire spinlock]\n",
 682                                    dev_priv->engine[i]->name);
 683                 } else if (ee->num_waiters) {
 684                         err_printf(m, "%s --- %d waiters\n",
 685                                    dev_priv->engine[i]->name,
 686                                    ee->num_waiters);
 687                         for (j = 0; j < ee->num_waiters; j++) {
 688                                 err_printf(m, " seqno 0x%08x for %s [%d]\n",
 689                                            ee->waiters[j].seqno,
 690                                            ee->waiters[j].comm,
 691                                            ee->waiters[j].pid);
 692                         }
 693                 }
 694
 695                 print_error_obj(m, dev_priv->engine[i],
 696                                 "ringbuffer", ee->ringbuffer);
 697
 698                 print_error_obj(m, dev_priv->engine[i],
 699                                 "HW Status", ee->hws_page);
 700
 701                 print_error_obj(m, dev_priv->engine[i],
 702                                 "HW context", ee->ctx);
 703
 704                 print_error_obj(m, dev_priv->engine[i],
 705                                 "WA context", ee->wa_ctx);
 706
 707                 print_error_obj(m, dev_priv->engine[i],
 708                                 "WA batchbuffer", ee->wa_batchbuffer);
 709         }
 710
 711         print_error_obj(m, NULL, "Semaphores", error->semaphore);
 712
 713         print_error_obj(m, NULL, "GuC log buffer", error->guc_log);
 714
 715         if (error->overlay)
 716                 intel_overlay_print_error_state(m, error->overlay);
 717
 718         if (error->display)
 719                 intel_display_print_error_state(m, dev_priv, error->display);
 720
 721 out:
 722         if (m->bytes == 0 && m->err)
 723                 return m->err;
 724
 725         return 0;
 726 }
 727
 728 int i915_error_state_buf_init(struct drm_i915_error_state_buf *ebuf,
 729                               struct drm_i915_private *i915,
 730                               size_t count, loff_t pos)
 731 {
 732         memset(ebuf, 0, sizeof(*ebuf));
 733         ebuf->i915 = i915;
 734
 735         /* We need to have enough room to store any i915_error_state printf
 736          * so that we can move it to start position.
 737          */
 738         ebuf->size = count + 1 > PAGE_SIZE ? count + 1 : PAGE_SIZE;
 739         ebuf->buf = kmalloc(ebuf->size,
 740                                 GFP_TEMPORARY | __GFP_NORETRY | __GFP_NOWARN);
 741
 742         if (ebuf->buf == NULL) {
 743                 ebuf->size = PAGE_SIZE;
 744                 ebuf->buf = kmalloc(ebuf->size, GFP_TEMPORARY);
 745         }
 746
 747         if (ebuf->buf == NULL) {
 748                 ebuf->size = 128;
 749                 ebuf->buf = kmalloc(ebuf->size, GFP_TEMPORARY);
 750         }
 751
 752         if (ebuf->buf == NULL)
 753                 return -ENOMEM;
 754
 755         ebuf->start = pos;
 756
 757         return 0;
 758 }
 759
 760 static void i915_error_object_free(struct drm_i915_error_object *obj)
 761 {
 762         int page;
 763
 764         if (obj == NULL)
 765                 return;
 766
 767         for (page = 0; page < obj->page_count; page++)
 768                 free_page((unsigned long)obj->pages[page]);
 769
 770         kfree(obj);
 771 }
 772
 773 static void i915_error_state_free(struct kref *error_ref)
 774 {
 775         struct drm_i915_error_state *error = container_of(error_ref,
 776                                                           typeof(*error), ref);
 777         int i;
 778
 779         for (i = 0; i < ARRAY_SIZE(error->engine); i++) {
 780                 struct drm_i915_error_engine *ee = &error->engine[i];
 781
 782                 i915_error_object_free(ee->batchbuffer);
 783                 i915_error_object_free(ee->wa_batchbuffer);
 784                 i915_error_object_free(ee->ringbuffer);
 785                 i915_error_object_free(ee->hws_page);
 786                 i915_error_object_free(ee->ctx);
 787                 i915_error_object_free(ee->wa_ctx);
 788
 789                 kfree(ee->requests);
 790                 if (!IS_ERR_OR_NULL(ee->waiters))
 791                         kfree(ee->waiters);
 792         }
 793
 794         i915_error_object_free(error->semaphore);
 795         i915_error_object_free(error->guc_log);
 796
 797         for (i = 0; i < ARRAY_SIZE(error->active_bo); i++)
 798                 kfree(error->active_bo[i]);
 799         kfree(error->pinned_bo);
 800
 801         kfree(error->overlay);
 802         kfree(error->display);
 803         kfree(error);
 804 }
 805
 806 static struct drm_i915_error_object *
 807 i915_error_object_create(struct drm_i915_private *i915,
 808                          struct i915_vma *vma)
 809 {
 810         struct i915_ggtt *ggtt = &i915->ggtt;
 811         const u64 slot = ggtt->error_capture.start;
 812         struct drm_i915_error_object *dst;
 813         struct compress compress;
 814         unsigned long num_pages;
 815         struct sgt_iter iter;
 816         dma_addr_t dma;
 817
 818         if (!vma)
 819                 return NULL;
 820
 821         num_pages = min_t(u64, vma->size, vma->obj->base.size) >> PAGE_SHIFT;
 822         num_pages = DIV_ROUND_UP(10 * num_pages, 8); /* worstcase zlib growth */
 823         dst = kmalloc(sizeof(*dst) + num_pages * sizeof(u32 *),
 824                       GFP_ATOMIC | __GFP_NOWARN);
 825         if (!dst)
 826                 return NULL;
 827
 828         dst->gtt_offset = vma->node.start;
 829         dst->gtt_size = vma->node.size;
 830         dst->page_count = 0;
 831         dst->unused = 0;
 832
 833         if (!compress_init(&compress)) {
 834                 kfree(dst);
 835                 return NULL;
 836         }
 837
 838         for_each_sgt_dma(dma, iter, vma->pages) {
 839                 void __iomem *s;
 840                 int ret;
 841
 842                 ggtt->base.insert_page(&ggtt->base, dma, slot,
 843                                        I915_CACHE_NONE, 0);
 844
 845                 s = io_mapping_map_atomic_wc(&ggtt->mappable, slot);
 846                 ret = compress_page(&compress, (void  __force *)s, dst);
 847                 io_mapping_unmap_atomic(s);
 848
 849                 if (ret)
 850                         goto unwind;
 851         }
 852         goto out;
 853
 854 unwind:
 855         while (dst->page_count--)
 856                 free_page((unsigned long)dst->pages[dst->page_count]);
 857         kfree(dst);
 858         dst = NULL;
 859
 860 out:
 861         compress_fini(&compress, dst);
 862         ggtt->base.clear_range(&ggtt->base, slot, PAGE_SIZE);
 863         return dst;
 864 }
 865
 866 /* The error capture is special as tries to run underneath the normal
 867  * locking rules - so we use the raw version of the i915_gem_active lookup.
 868  */
 869 static inline uint32_t
 870 __active_get_seqno(struct i915_gem_active *active)
 871 {
 872         struct drm_i915_gem_request *request;
 873
 874         request = __i915_gem_active_peek(active);
 875         return request ? request->global_seqno : 0;
 876 }
 877
 878 static inline int
 879 __active_get_engine_id(struct i915_gem_active *active)
 880 {
 881         struct drm_i915_gem_request *request;
 882
 883         request = __i915_gem_active_peek(active);
 884         return request ? request->engine->id : -1;
 885 }
 886
 887 static void capture_bo(struct drm_i915_error_buffer *err,
 888                        struct i915_vma *vma)
 889 {
 890         struct drm_i915_gem_object *obj = vma->obj;
 891         int i;
 892
 893         err->size = obj->base.size;
 894         err->name = obj->base.name;
 895
 896         for (i = 0; i < I915_NUM_ENGINES; i++)
 897                 err->rseqno[i] = __active_get_seqno(&vma->last_read[i]);
 898         err->wseqno = __active_get_seqno(&obj->frontbuffer_write);
 899         err->engine = __active_get_engine_id(&obj->frontbuffer_write);
 900
 901         err->gtt_offset = vma->node.start;
 902         err->read_domains = obj->base.read_domains;
 903         err->write_domain = obj->base.write_domain;
 904         err->fence_reg = vma->fence ? vma->fence->id : -1;
 905         err->tiling = i915_gem_object_get_tiling(obj);
 906         err->dirty = obj->mm.dirty;
 907         err->purgeable = obj->mm.madv != I915_MADV_WILLNEED;
 908         err->userptr = obj->userptr.mm != NULL;
 909         err->cache_level = obj->cache_level;
 910 }
 911
 912 static u32 capture_error_bo(struct drm_i915_error_buffer *err,
 913                             int count, struct list_head *head,
 914                             bool pinned_only)
 915 {
 916         struct i915_vma *vma;
 917         int i = 0;
 918
 919         list_for_each_entry(vma, head, vm_link) {
 920                 if (pinned_only && !i915_vma_is_pinned(vma))
 921                         continue;
 922
 923                 capture_bo(err++, vma);
 924                 if (++i == count)
 925                         break;
 926         }
 927
 928         return i;
 929 }
 930
 931 /* Generate a semi-unique error code. The code is not meant to have meaning, The
 932  * code's only purpose is to try to prevent false duplicated bug reports by
 933  * grossly estimating a GPU error state.
 934  *
 935  * TODO Ideally, hashing the batchbuffer would be a very nice way to determine
 936  * the hang if we could strip the GTT offset information from it.
 937  *
 938  * It's only a small step better than a random number in its current form.
 939  */
 940 static uint32_t i915_error_generate_code(struct drm_i915_private *dev_priv,
 941                                          struct drm_i915_error_state *error,
 942                                          int *engine_id)
 943 {
 944         uint32_t error_code = 0;
 945         int i;
 946
 947         /* IPEHR would be an ideal way to detect errors, as it's the gross
 948          * measure of "the command that hung." However, has some very common
 949          * synchronization commands which almost always appear in the case
 950          * strictly a client bug. Use instdone to differentiate those some.
 951          */
 952         for (i = 0; i < I915_NUM_ENGINES; i++) {
 953                 if (error->engine[i].hangcheck_stalled) {
 954                         if (engine_id)
 955                                 *engine_id = i;
 956
 957                         return error->engine[i].ipehr ^
 958                                error->engine[i].instdone.instdone;
 959                 }
 960         }
 961
 962         return error_code;
 963 }
 964
 965 static void i915_gem_record_fences(struct drm_i915_private *dev_priv,
 966                                    struct drm_i915_error_state *error)
 967 {
 968         int i;
 969
 970         if (IS_GEN3(dev_priv) || IS_GEN2(dev_priv)) {
 971                 for (i = 0; i < dev_priv->num_fence_regs; i++)
 972                         error->fence[i] = I915_READ(FENCE_REG(i));
 973         } else if (IS_GEN5(dev_priv) || IS_GEN4(dev_priv)) {
 974                 for (i = 0; i < dev_priv->num_fence_regs; i++)
 975                         error->fence[i] = I915_READ64(FENCE_REG_965_LO(i));
 976         } else if (INTEL_GEN(dev_priv) >= 6) {
 977                 for (i = 0; i < dev_priv->num_fence_regs; i++)
 978                         error->fence[i] = I915_READ64(FENCE_REG_GEN6_LO(i));
 979         }
 980 }
 981
 982 static inline u32
 983 gen8_engine_sync_index(struct intel_engine_cs *engine,
 984                        struct intel_engine_cs *other)
 985 {
 986         int idx;
 987
 988         /*
 989          * rcs -> 0 = vcs, 1 = bcs, 2 = vecs, 3 = vcs2;
 990          * vcs -> 0 = bcs, 1 = vecs, 2 = vcs2, 3 = rcs;
 991          * bcs -> 0 = vecs, 1 = vcs2. 2 = rcs, 3 = vcs;
 992          * vecs -> 0 = vcs2, 1 = rcs, 2 = vcs, 3 = bcs;
 993          * vcs2 -> 0 = rcs, 1 = vcs, 2 = bcs, 3 = vecs;
 994          */
 995
 996         idx = (other - engine) - 1;
 997         if (idx < 0)
 998                 idx += I915_NUM_ENGINES;
 999
1000         return idx;
1001 }
1002
1003 static void gen8_record_semaphore_state(struct drm_i915_error_state *error,
1004                                         struct intel_engine_cs *engine,
1005                                         struct drm_i915_error_engine *ee)
1006 {
1007         struct drm_i915_private *dev_priv = engine->i915;
1008         struct intel_engine_cs *to;
1009         enum intel_engine_id id;
1010
1011         if (!error->semaphore)
1012                 return;
1013
1014         for_each_engine(to, dev_priv, id) {
1015                 int idx;
1016                 u16 signal_offset;
1017                 u32 *tmp;
1018
1019                 if (engine == to)
1020                         continue;
1021
1022                 signal_offset =
1023                         (GEN8_SIGNAL_OFFSET(engine, id) & (PAGE_SIZE - 1)) / 4;
1024                 tmp = error->semaphore->pages[0];
1025                 idx = gen8_engine_sync_index(engine, to);
1026
1027                 ee->semaphore_mboxes[idx] = tmp[signal_offset];
1028         }
1029 }
1030
1031 static void gen6_record_semaphore_state(struct intel_engine_cs *engine,
1032                                         struct drm_i915_error_engine *ee)
1033 {
1034         struct drm_i915_private *dev_priv = engine->i915;
1035
1036         ee->semaphore_mboxes[0] = I915_READ(RING_SYNC_0(engine->mmio_base));
1037         ee->semaphore_mboxes[1] = I915_READ(RING_SYNC_1(engine->mmio_base));
1038         if (HAS_VEBOX(dev_priv))
1039                 ee->semaphore_mboxes[2] =
1040                         I915_READ(RING_SYNC_2(engine->mmio_base));
1041 }
1042
1043 static void error_record_engine_waiters(struct intel_engine_cs *engine,
1044                                         struct drm_i915_error_engine *ee)
1045 {
1046         struct intel_breadcrumbs *b = &engine->breadcrumbs;
1047         struct drm_i915_error_waiter *waiter;
1048         struct rb_node *rb;
1049         int count;
1050
1051         ee->num_waiters = 0;
1052         ee->waiters = NULL;
1053
1054         if (RB_EMPTY_ROOT(&b->waiters))
1055                 return;
1056
1057         if (!spin_trylock_irq(&b->lock)) {
1058                 ee->waiters = ERR_PTR(-EDEADLK);
1059                 return;
1060         }
1061
1062         count = 0;
1063         for (rb = rb_first(&b->waiters); rb != NULL; rb = rb_next(rb))
1064                 count++;
1065         spin_unlock_irq(&b->lock);
1066
1067         waiter = NULL;
1068         if (count)
1069                 waiter = kmalloc_array(count,
1070                                        sizeof(struct drm_i915_error_waiter),
1071                                        GFP_ATOMIC);
1072         if (!waiter)
1073                 return;
1074
1075         if (!spin_trylock_irq(&b->lock)) {
1076                 kfree(waiter);
1077                 ee->waiters = ERR_PTR(-EDEADLK);
1078                 return;
1079         }
1080
1081         ee->waiters = waiter;
1082         for (rb = rb_first(&b->waiters); rb; rb = rb_next(rb)) {
1083                 struct intel_wait *w = container_of(rb, typeof(*w), node);
1084
1085                 strcpy(waiter->comm, w->tsk->comm);
1086                 waiter->pid = w->tsk->pid;
1087                 waiter->seqno = w->seqno;
1088                 waiter++;
1089
1090                 if (++ee->num_waiters == count)
1091                         break;
1092         }
1093         spin_unlock_irq(&b->lock);
1094 }
1095
1096 static void error_record_engine_registers(struct drm_i915_error_state *error,
1097                                           struct intel_engine_cs *engine,
1098                                           struct drm_i915_error_engine *ee)
1099 {
1100         struct drm_i915_private *dev_priv = engine->i915;
1101
1102         if (INTEL_GEN(dev_priv) >= 6) {
1103                 ee->rc_psmi = I915_READ(RING_PSMI_CTL(engine->mmio_base));
1104                 ee->fault_reg = I915_READ(RING_FAULT_REG(engine));
1105                 if (INTEL_GEN(dev_priv) >= 8)
1106                         gen8_record_semaphore_state(error, engine, ee);
1107                 else
1108                         gen6_record_semaphore_state(engine, ee);
1109         }
1110
1111         if (INTEL_GEN(dev_priv) >= 4) {
1112                 ee->faddr = I915_READ(RING_DMA_FADD(engine->mmio_base));
1113                 ee->ipeir = I915_READ(RING_IPEIR(engine->mmio_base));
1114                 ee->ipehr = I915_READ(RING_IPEHR(engine->mmio_base));
1115                 ee->instps = I915_READ(RING_INSTPS(engine->mmio_base));
1116                 ee->bbaddr = I915_READ(RING_BBADDR(engine->mmio_base));
1117                 if (INTEL_GEN(dev_priv) >= 8) {
1118                         ee->faddr |= (u64) I915_READ(RING_DMA_FADD_UDW(engine->mmio_base)) << 32;
1119                         ee->bbaddr |= (u64) I915_READ(RING_BBADDR_UDW(engine->mmio_base)) << 32;
1120                 }
1121                 ee->bbstate = I915_READ(RING_BBSTATE(engine->mmio_base));
1122         } else {
1123                 ee->faddr = I915_READ(DMA_FADD_I8XX);
1124                 ee->ipeir = I915_READ(IPEIR);
1125                 ee->ipehr = I915_READ(IPEHR);
1126         }
1127
1128         intel_engine_get_instdone(engine, &ee->instdone);
1129
1130         ee->waiting = intel_engine_has_waiter(engine);
1131         ee->instpm = I915_READ(RING_INSTPM(engine->mmio_base));
1132         ee->acthd = intel_engine_get_active_head(engine);
1133         ee->seqno = intel_engine_get_seqno(engine);
1134         ee->last_seqno = intel_engine_last_submit(engine);
1135         ee->start = I915_READ_START(engine);
1136         ee->head = I915_READ_HEAD(engine);
1137         ee->tail = I915_READ_TAIL(engine);
1138         ee->ctl = I915_READ_CTL(engine);
1139         if (INTEL_GEN(dev_priv) > 2)
1140                 ee->mode = I915_READ_MODE(engine);
1141
1142         if (!HWS_NEEDS_PHYSICAL(dev_priv)) {
1143                 i915_reg_t mmio;
1144
1145                 if (IS_GEN7(dev_priv)) {
1146                         switch (engine->id) {
1147                         default:
1148                         case RCS:
1149                                 mmio = RENDER_HWS_PGA_GEN7;
1150                                 break;
1151                         case BCS:
1152                                 mmio = BLT_HWS_PGA_GEN7;
1153                                 break;
1154                         case VCS:
1155                                 mmio = BSD_HWS_PGA_GEN7;
1156                                 break;
1157                         case VECS:
1158                                 mmio = VEBOX_HWS_PGA_GEN7;
1159                                 break;
1160                         }
1161                 } else if (IS_GEN6(engine->i915)) {
1162                         mmio = RING_HWS_PGA_GEN6(engine->mmio_base);
1163                 } else {
1164                         /* XXX: gen8 returns to sanity */
1165                         mmio = RING_HWS_PGA(engine->mmio_base);
1166                 }
1167
1168                 ee->hws = I915_READ(mmio);
1169         }
1170
1171         ee->hangcheck_timestamp = engine->hangcheck.action_timestamp;
1172         ee->hangcheck_action = engine->hangcheck.action;
1173         ee->hangcheck_stalled = engine->hangcheck.stalled;
1174
1175         if (USES_PPGTT(dev_priv)) {
1176                 int i;
1177
1178                 ee->vm_info.gfx_mode = I915_READ(RING_MODE_GEN7(engine));
1179
1180                 if (IS_GEN6(dev_priv))
1181                         ee->vm_info.pp_dir_base =
1182                                 I915_READ(RING_PP_DIR_BASE_READ(engine));
1183                 else if (IS_GEN7(dev_priv))
1184                         ee->vm_info.pp_dir_base =
1185                                 I915_READ(RING_PP_DIR_BASE(engine));
1186                 else if (INTEL_GEN(dev_priv) >= 8)
1187                         for (i = 0; i < 4; i++) {
1188                                 ee->vm_info.pdp[i] =
1189                                         I915_READ(GEN8_RING_PDP_UDW(engine, i));
1190                                 ee->vm_info.pdp[i] <<= 32;
1191                                 ee->vm_info.pdp[i] |=
1192                                         I915_READ(GEN8_RING_PDP_LDW(engine, i));
1193                         }
1194         }
1195 }
1196
1197 static void record_request(struct drm_i915_gem_request *request,
1198                            struct drm_i915_error_request *erq)
1199 {
1200         erq->context = request->ctx->hw_id;
1201         erq->ban_score = request->ctx->ban_score;
1202         erq->seqno = request->global_seqno;
1203         erq->jiffies = request->emitted_jiffies;
1204         erq->head = request->head;
1205         erq->tail = request->tail;
1206
1207         rcu_read_lock();
1208         erq->pid = request->ctx->pid ? pid_nr(request->ctx->pid) : 0;
1209         rcu_read_unlock();
1210 }
1211
1212 static void engine_record_requests(struct intel_engine_cs *engine,
1213                                    struct drm_i915_gem_request *first,
1214                                    struct drm_i915_error_engine *ee)
1215 {
1216         struct drm_i915_gem_request *request;
1217         int count;
1218
1219         count = 0;
1220         request = first;
1221         list_for_each_entry_from(request, &engine->timeline->requests, link)
1222                 count++;
1223         if (!count)
1224                 return;
1225
1226         ee->requests = kcalloc(count, sizeof(*ee->requests), GFP_ATOMIC);
1227         if (!ee->requests)
1228                 return;
1229
1230         ee->num_requests = count;
1231
1232         count = 0;
1233         request = first;
1234         list_for_each_entry_from(request, &engine->timeline->requests, link) {
1235                 if (count >= ee->num_requests) {
1236                         /*
1237                          * If the ring request list was changed in
1238                          * between the point where the error request
1239                          * list was created and dimensioned and this
1240                          * point then just exit early to avoid crashes.
1241                          *
1242                          * We don't need to communicate that the
1243                          * request list changed state during error
1244                          * state capture and that the error state is
1245                          * slightly incorrect as a consequence since we
1246                          * are typically only interested in the request
1247                          * list state at the point of error state
1248                          * capture, not in any changes happening during
1249                          * the capture.
1250                          */
1251                         break;
1252                 }
1253
1254                 record_request(request, &ee->requests[count++]);
1255         }
1256         ee->num_requests = count;
1257 }
1258
1259 static void error_record_engine_execlists(struct intel_engine_cs *engine,
1260                                           struct drm_i915_error_engine *ee)
1261 {
1262         unsigned int n;
1263
1264         for (n = 0; n < ARRAY_SIZE(engine->execlist_port); n++)
1265                 if (engine->execlist_port[n].request)
1266                         record_request(engine->execlist_port[n].request,
1267                                        &ee->execlist[n]);
1268 }
1269
1270 static void i915_gem_record_rings(struct drm_i915_private *dev_priv,
1271                                   struct drm_i915_error_state *error)
1272 {
1273         struct i915_ggtt *ggtt = &dev_priv->ggtt;
1274         int i;
1275
1276         error->semaphore =
1277                 i915_error_object_create(dev_priv, dev_priv->semaphore);
1278
1279         for (i = 0; i < I915_NUM_ENGINES; i++) {
1280                 struct intel_engine_cs *engine = dev_priv->engine[i];
1281                 struct drm_i915_error_engine *ee = &error->engine[i];
1282                 struct drm_i915_gem_request *request;
1283
1284                 ee->pid = -1;
1285                 ee->engine_id = -1;
1286
1287                 if (!engine)
1288                         continue;
1289
1290                 ee->engine_id = i;
1291
1292                 error_record_engine_registers(error, engine, ee);
1293                 error_record_engine_waiters(engine, ee);
1294                 error_record_engine_execlists(engine, ee);
1295
1296                 request = i915_gem_find_active_request(engine);
1297                 if (request) {
1298                         struct intel_ring *ring;
1299                         struct pid *pid;
1300
1301                         ee->vm = request->ctx->ppgtt ?
1302                                 &request->ctx->ppgtt->base : &ggtt->base;
1303
1304                         /* We need to copy these to an anonymous buffer
1305                          * as the simplest method to avoid being overwritten
1306                          * by userspace.
1307                          */
1308                         ee->batchbuffer =
1309                                 i915_error_object_create(dev_priv,
1310                                                          request->batch);
1311
1312                         if (HAS_BROKEN_CS_TLB(dev_priv))
1313                                 ee->wa_batchbuffer =
1314                                         i915_error_object_create(dev_priv,
1315                                                                  engine->scratch);
1316
1317                         ee->ctx =
1318                                 i915_error_object_create(dev_priv,
1319                                                          request->ctx->engine[i].state);
1320
1321                         pid = request->ctx->pid;
1322                         if (pid) {
1323                                 struct task_struct *task;
1324
1325                                 rcu_read_lock();
1326                                 task = pid_task(pid, PIDTYPE_PID);
1327                                 if (task) {
1328                                         strcpy(ee->comm, task->comm);
1329                                         ee->pid = task->pid;
1330                                 }
1331                                 rcu_read_unlock();
1332                         }
1333
1334                         error->simulated |=
1335                                 i915_gem_context_no_error_capture(request->ctx);
1336
1337                         ee->rq_head = request->head;
1338                         ee->rq_post = request->postfix;
1339                         ee->rq_tail = request->tail;
1340
1341                         ring = request->ring;
1342                         ee->cpu_ring_head = ring->head;
1343                         ee->cpu_ring_tail = ring->tail;
1344                         ee->ringbuffer =
1345                                 i915_error_object_create(dev_priv, ring->vma);
1346
1347                         engine_record_requests(engine, request, ee);
1348                 }
1349
1350                 ee->hws_page =
1351                         i915_error_object_create(dev_priv,
1352                                                  engine->status_page.vma);
1353
1354                 ee->wa_ctx =
1355                         i915_error_object_create(dev_priv, engine->wa_ctx.vma);
1356         }
1357 }
1358
1359 static void i915_gem_capture_vm(struct drm_i915_private *dev_priv,
1360                                 struct drm_i915_error_state *error,
1361                                 struct i915_address_space *vm,
1362                                 int idx)
1363 {
1364         struct drm_i915_error_buffer *active_bo;
1365         struct i915_vma *vma;
1366         int count;
1367
1368         count = 0;
1369         list_for_each_entry(vma, &vm->active_list, vm_link)
1370                 count++;
1371
1372         active_bo = NULL;
1373         if (count)
1374                 active_bo = kcalloc(count, sizeof(*active_bo), GFP_ATOMIC);
1375         if (active_bo)
1376                 count = capture_error_bo(active_bo, count, &vm->active_list, false);
1377         else
1378                 count = 0;
1379
1380         error->active_vm[idx] = vm;
1381         error->active_bo[idx] = active_bo;
1382         error->active_bo_count[idx] = count;
1383 }
1384
1385 static void i915_capture_active_buffers(struct drm_i915_private *dev_priv,
1386                                         struct drm_i915_error_state *error)
1387 {
1388         int cnt = 0, i, j;
1389
1390         BUILD_BUG_ON(ARRAY_SIZE(error->engine) > ARRAY_SIZE(error->active_bo));
1391         BUILD_BUG_ON(ARRAY_SIZE(error->active_bo) != ARRAY_SIZE(error->active_vm));
1392         BUILD_BUG_ON(ARRAY_SIZE(error->active_bo) != ARRAY_SIZE(error->active_bo_count));
1393
1394         /* Scan each engine looking for unique active contexts/vm */
1395         for (i = 0; i < ARRAY_SIZE(error->engine); i++) {
1396                 struct drm_i915_error_engine *ee = &error->engine[i];
1397                 bool found;
1398
1399                 if (!ee->vm)
1400                         continue;
1401
1402                 found = false;
1403                 for (j = 0; j < i && !found; j++)
1404                         found = error->engine[j].vm == ee->vm;
1405                 if (!found)
1406                         i915_gem_capture_vm(dev_priv, error, ee->vm, cnt++);
1407         }
1408 }
1409
1410 static void i915_capture_pinned_buffers(struct drm_i915_private *dev_priv,
1411                                         struct drm_i915_error_state *error)
1412 {
1413         struct i915_address_space *vm = &dev_priv->ggtt.base;
1414         struct drm_i915_error_buffer *bo;
1415         struct i915_vma *vma;
1416         int count_inactive, count_active;
1417
1418         count_inactive = 0;
1419         list_for_each_entry(vma, &vm->active_list, vm_link)
1420                 count_inactive++;
1421
1422         count_active = 0;
1423         list_for_each_entry(vma, &vm->inactive_list, vm_link)
1424                 count_active++;
1425
1426         bo = NULL;
1427         if (count_inactive + count_active)
1428                 bo = kcalloc(count_inactive + count_active,
1429                              sizeof(*bo), GFP_ATOMIC);
1430         if (!bo)
1431                 return;
1432
1433         count_inactive = capture_error_bo(bo, count_inactive,
1434                                           &vm->active_list, true);
1435         count_active = capture_error_bo(bo + count_inactive, count_active,
1436                                         &vm->inactive_list, true);
1437         error->pinned_bo_count = count_inactive + count_active;
1438         error->pinned_bo = bo;
1439 }
1440
1441 static void i915_gem_capture_guc_log_buffer(struct drm_i915_private *dev_priv,
1442                                             struct drm_i915_error_state *error)
1443 {
1444         /* Capturing log buf contents won't be useful if logging was disabled */
1445         if (!dev_priv->guc.log.vma || (i915.guc_log_level < 0))
1446                 return;
1447
1448         error->guc_log = i915_error_object_create(dev_priv,
1449                                                   dev_priv->guc.log.vma);
1450 }
1451
1452 /* Capture all registers which don't fit into another category. */
1453 static void i915_capture_reg_state(struct drm_i915_private *dev_priv,
1454                                    struct drm_i915_error_state *error)
1455 {
1456         int i;
1457
1458         /* General organization
1459          * 1. Registers specific to a single generation
1460          * 2. Registers which belong to multiple generations
1461          * 3. Feature specific registers.
1462          * 4. Everything else
1463          * Please try to follow the order.
1464          */
1465
1466         /* 1: Registers specific to a single generation */
1467         if (IS_VALLEYVIEW(dev_priv)) {
1468                 error->gtier[0] = I915_READ(GTIER);
1469                 error->ier = I915_READ(VLV_IER);
1470                 error->forcewake = I915_READ_FW(FORCEWAKE_VLV);
1471         }
1472
1473         if (IS_GEN7(dev_priv))
1474                 error->err_int = I915_READ(GEN7_ERR_INT);
1475
1476         if (INTEL_GEN(dev_priv) >= 8) {
1477                 error->fault_data0 = I915_READ(GEN8_FAULT_TLB_DATA0);
1478                 error->fault_data1 = I915_READ(GEN8_FAULT_TLB_DATA1);
1479         }
1480
1481         if (IS_GEN6(dev_priv)) {
1482                 error->forcewake = I915_READ_FW(FORCEWAKE);
1483                 error->gab_ctl = I915_READ(GAB_CTL);
1484                 error->gfx_mode = I915_READ(GFX_MODE);
1485         }
1486
1487         /* 2: Registers which belong to multiple generations */
1488         if (INTEL_GEN(dev_priv) >= 7)
1489                 error->forcewake = I915_READ_FW(FORCEWAKE_MT);
1490
1491         if (INTEL_GEN(dev_priv) >= 6) {
1492                 error->derrmr = I915_READ(DERRMR);
1493                 error->error = I915_READ(ERROR_GEN6);
1494                 error->done_reg = I915_READ(DONE_REG);
1495         }
1496
1497         /* 3: Feature specific registers */
1498         if (IS_GEN6(dev_priv) || IS_GEN7(dev_priv)) {
1499                 error->gam_ecochk = I915_READ(GAM_ECOCHK);
1500                 error->gac_eco = I915_READ(GAC_ECO_BITS);
1501         }
1502
1503         /* 4: Everything else */
1504         if (HAS_HW_CONTEXTS(dev_priv))
1505                 error->ccid = I915_READ(CCID);
1506
1507         if (INTEL_GEN(dev_priv) >= 8) {
1508                 error->ier = I915_READ(GEN8_DE_MISC_IER);
1509                 for (i = 0; i < 4; i++)
1510                         error->gtier[i] = I915_READ(GEN8_GT_IER(i));
1511         } else if (HAS_PCH_SPLIT(dev_priv)) {
1512                 error->ier = I915_READ(DEIER);
1513                 error->gtier[0] = I915_READ(GTIER);
1514         } else if (IS_GEN2(dev_priv)) {
1515                 error->ier = I915_READ16(IER);
1516         } else if (!IS_VALLEYVIEW(dev_priv)) {
1517                 error->ier = I915_READ(IER);
1518         }
1519         error->eir = I915_READ(EIR);
1520         error->pgtbl_er = I915_READ(PGTBL_ER);
1521 }
1522
1523 static void i915_error_capture_msg(struct drm_i915_private *dev_priv,
1524                                    struct drm_i915_error_state *error,
1525                                    u32 engine_mask,
1526                                    const char *error_msg)
1527 {
1528         u32 ecode;
1529         int engine_id = -1, len;
1530
1531         ecode = i915_error_generate_code(dev_priv, error, &engine_id);
1532
1533         len = scnprintf(error->error_msg, sizeof(error->error_msg),
1534                         "GPU HANG: ecode %d:%d:0x%08x",
1535                         INTEL_GEN(dev_priv), engine_id, ecode);
1536
1537         if (engine_id != -1 && error->engine[engine_id].pid != -1)
1538                 len += scnprintf(error->error_msg + len,
1539                                  sizeof(error->error_msg) - len,
1540                                  ", in %s [%d]",
1541                                  error->engine[engine_id].comm,
1542                                  error->engine[engine_id].pid);
1543
1544         scnprintf(error->error_msg + len, sizeof(error->error_msg) - len,
1545                   ", reason: %s, action: %s",
1546                   error_msg,
1547                   engine_mask ? "reset" : "continue");
1548 }
1549
1550 static void i915_capture_gen_state(struct drm_i915_private *dev_priv,
1551                                    struct drm_i915_error_state *error)
1552 {
1553         error->iommu = -1;
1554 #ifdef CONFIG_INTEL_IOMMU
1555         error->iommu = intel_iommu_gfx_mapped;
1556 #endif
1557         error->reset_count = i915_reset_count(&dev_priv->gpu_error);
1558         error->suspend_count = dev_priv->suspend_count;
1559
1560         memcpy(&error->device_info,
1561                INTEL_INFO(dev_priv),
1562                sizeof(error->device_info));
1563 }
1564
1565 static int capture(void *data)
1566 {
1567         struct drm_i915_error_state *error = data;
1568
1569         i915_capture_gen_state(error->i915, error);
1570         i915_capture_reg_state(error->i915, error);
1571         i915_gem_record_fences(error->i915, error);
1572         i915_gem_record_rings(error->i915, error);
1573         i915_capture_active_buffers(error->i915, error);
1574         i915_capture_pinned_buffers(error->i915, error);
1575         i915_gem_capture_guc_log_buffer(error->i915, error);
1576
1577         do_gettimeofday(&error->time);
1578         error->boottime = ktime_to_timeval(ktime_get_boottime());
1579         error->uptime =
1580                 ktime_to_timeval(ktime_sub(ktime_get(),
1581                                            error->i915->gt.last_init_time));
1582
1583         error->overlay = intel_overlay_capture_error_state(error->i915);
1584         error->display = intel_display_capture_error_state(error->i915);
1585
1586         return 0;
1587 }
1588
1589 #define DAY_AS_SECONDS(x) (24 * 60 * 60 * (x))
1590
1591 /**
1592  * i915_capture_error_state - capture an error record for later analysis
1593  * @dev: drm device
1594  *
1595  * Should be called when an error is detected (either a hang or an error
1596  * interrupt) to capture error state from the time of the error.  Fills
1597  * out a structure which becomes available in debugfs for user level tools
1598  * to pick up.
1599  */
1600 void i915_capture_error_state(struct drm_i915_private *dev_priv,
1601                               u32 engine_mask,
1602                               const char *error_msg)
1603 {
1604         static bool warned;
1605         struct drm_i915_error_state *error;
1606         unsigned long flags;
1607
1608         if (!i915.error_capture)
1609                 return;
1610
1611         if (READ_ONCE(dev_priv->gpu_error.first_error))
1612                 return;
1613
1614         /* Account for pipe specific data like PIPE*STAT */
1615         error = kzalloc(sizeof(*error), GFP_ATOMIC);
1616         if (!error) {
1617                 DRM_DEBUG_DRIVER("out of memory, not capturing error state\n");
1618                 return;
1619         }
1620
1621         kref_init(&error->ref);
1622         error->i915 = dev_priv;
1623
1624         stop_machine(capture, error, NULL);
1625
1626         i915_error_capture_msg(dev_priv, error, engine_mask, error_msg);
1627         DRM_INFO("%s\n", error->error_msg);
1628
1629         if (!error->simulated) {
1630                 spin_lock_irqsave(&dev_priv->gpu_error.lock, flags);
1631                 if (!dev_priv->gpu_error.first_error) {
1632                         dev_priv->gpu_error.first_error = error;
1633                         error = NULL;
1634                 }
1635                 spin_unlock_irqrestore(&dev_priv->gpu_error.lock, flags);
1636         }
1637
1638         if (error) {
1639                 i915_error_state_free(&error->ref);
1640                 return;
1641         }
1642
1643         if (!warned &&
1644             ktime_get_real_seconds() - DRIVER_TIMESTAMP < DAY_AS_SECONDS(180)) {
1645                 DRM_INFO("GPU hangs can indicate a bug anywhere in the entire gfx stack, including userspace.\n");
1646                 DRM_INFO("Please file a _new_ bug report on bugs.freedesktop.org against DRI -> DRM/Intel\n");
1647                 DRM_INFO("drm/i915 developers can then reassign to the right component if it's not a kernel issue.\n");
1648                 DRM_INFO("The gpu crash dump is required to analyze gpu hangs, so please always attach it.\n");
1649                 DRM_INFO("GPU crash dump saved to /sys/class/drm/card%d/error\n",
1650                          dev_priv->drm.primary->index);
1651                 warned = true;
1652         }
1653 }
1654
1655 void i915_error_state_get(struct drm_device *dev,
1656                           struct i915_error_state_file_priv *error_priv)
1657 {
1658         struct drm_i915_private *dev_priv = to_i915(dev);
1659
1660         spin_lock_irq(&dev_priv->gpu_error.lock);
1661         error_priv->error = dev_priv->gpu_error.first_error;
1662         if (error_priv->error)
1663                 kref_get(&error_priv->error->ref);
1664         spin_unlock_irq(&dev_priv->gpu_error.lock);
1665 }
1666
1667 void i915_error_state_put(struct i915_error_state_file_priv *error_priv)
1668 {
1669         if (error_priv->error)
1670                 kref_put(&error_priv->error->ref, i915_error_state_free);
1671 }
1672
1673 void i915_destroy_error_state(struct drm_i915_private *dev_priv)
1674 {
1675         struct drm_i915_error_state *error;
1676
1677         spin_lock_irq(&dev_priv->gpu_error.lock);
1678         error = dev_priv->gpu_error.first_error;
1679         dev_priv->gpu_error.first_error = NULL;
1680         spin_unlock_irq(&dev_priv->gpu_error.lock);
1681
1682         if (error)
1683                 kref_put(&error->ref, i915_error_state_free);
1684 }