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 <eric@anholt.net>
  25  *    Keith Packard <keithp@keithp.com>
  26  *    Mika Kuoppala <mika.kuoppala@intel.com>
  27  *
  28  */
  29
  30 #include <generated/utsrelease.h>
  31 #include "i915_drv.h"
  32
  33 static const char *ring_str(int ring)
  34 {
  35         switch (ring) {
  36         case RCS: return "render";
  37         case VCS: return "bsd";
  38         case BCS: return "blt";
  39         case VECS: return "vebox";
  40         case VCS2: return "bsd2";
  41         default: return "";
  42         }
  43 }
  44
  45 static const char *pin_flag(int pinned)
  46 {
  47         if (pinned > 0)
  48                 return " P";
  49         else if (pinned < 0)
  50                 return " p";
  51         else
  52                 return "";
  53 }
  54
  55 static const char *tiling_flag(int tiling)
  56 {
  57         switch (tiling) {
  58         default:
  59         case I915_TILING_NONE: return "";
  60         case I915_TILING_X: return " X";
  61         case I915_TILING_Y: return " Y";
  62         }
  63 }
  64
  65 static const char *dirty_flag(int dirty)
  66 {
  67         return dirty ? " dirty" : "";
  68 }
  69
  70 static const char *purgeable_flag(int purgeable)
  71 {
  72         return purgeable ? " purgeable" : "";
  73 }
  74
  75 static bool __i915_error_ok(struct drm_i915_error_state_buf *e)
  76 {
  77
  78         if (!e->err && WARN(e->bytes > (e->size - 1), "overflow")) {
  79                 e->err = -ENOSPC;
  80                 return false;
  81         }
  82
  83         if (e->bytes == e->size - 1 || e->err)
  84                 return false;
  85
  86         return true;
  87 }
  88
  89 static bool __i915_error_seek(struct drm_i915_error_state_buf *e,
  90                               unsigned len)
  91 {
  92         if (e->pos + len <= e->start) {
  93                 e->pos += len;
  94                 return false;
  95         }
  96
  97         /* First vsnprintf needs to fit in its entirety for memmove */
  98         if (len >= e->size) {
  99                 e->err = -EIO;
 100                 return false;
 101         }
 102
 103         return true;
 104 }
 105
 106 static void __i915_error_advance(struct drm_i915_error_state_buf *e,
 107                                  unsigned len)
 108 {
 109         /* If this is first printf in this window, adjust it so that
 110          * start position matches start of the buffer
 111          */
 112
 113         if (e->pos < e->start) {
 114                 const size_t off = e->start - e->pos;
 115
 116                 /* Should not happen but be paranoid */
 117                 if (off > len || e->bytes) {
 118                         e->err = -EIO;
 119                         return;
 120                 }
 121
 122                 memmove(e->buf, e->buf + off, len - off);
 123                 e->bytes = len - off;
 124                 e->pos = e->start;
 125                 return;
 126         }
 127
 128         e->bytes += len;
 129         e->pos += len;
 130 }
 131
 132 static void i915_error_vprintf(struct drm_i915_error_state_buf *e,
 133                                const char *f, va_list args)
 134 {
 135         unsigned len;
 136
 137         if (!__i915_error_ok(e))
 138                 return;
 139
 140         /* Seek the first printf which is hits start position */
 141         if (e->pos < e->start) {
 142                 va_list tmp;
 143
 144                 va_copy(tmp, args);
 145                 len = vsnprintf(NULL, 0, f, tmp);
 146                 va_end(tmp);
 147
 148                 if (!__i915_error_seek(e, len))
 149                         return;
 150         }
 151
 152         len = vsnprintf(e->buf + e->bytes, e->size - e->bytes, f, args);
 153         if (len >= e->size - e->bytes)
 154                 len = e->size - e->bytes - 1;
 155
 156         __i915_error_advance(e, len);
 157 }
 158
 159 static void i915_error_puts(struct drm_i915_error_state_buf *e,
 160                             const char *str)
 161 {
 162         unsigned len;
 163
 164         if (!__i915_error_ok(e))
 165                 return;
 166
 167         len = strlen(str);
 168
 169         /* Seek the first printf which is hits start position */
 170         if (e->pos < e->start) {
 171                 if (!__i915_error_seek(e, len))
 172                         return;
 173         }
 174
 175         if (len >= e->size - e->bytes)
 176                 len = e->size - e->bytes - 1;
 177         memcpy(e->buf + e->bytes, str, len);
 178
 179         __i915_error_advance(e, len);
 180 }
 181
 182 #define err_printf(e, ...) i915_error_printf(e, __VA_ARGS__)
 183 #define err_puts(e, s) i915_error_puts(e, s)
 184
 185 static void print_error_buffers(struct drm_i915_error_state_buf *m,
 186                                 const char *name,
 187                                 struct drm_i915_error_buffer *err,
 188                                 int count)
 189 {
 190         int i;
 191
 192         err_printf(m, "  %s [%d]:\n", name, count);
 193
 194         while (count--) {
 195                 err_printf(m, "    %08x_%08x %8u %02x %02x [ ",
 196                            upper_32_bits(err->gtt_offset),
 197                            lower_32_bits(err->gtt_offset),
 198                            err->size,
 199                            err->read_domains,
 200                            err->write_domain);
 201                 for (i = 0; i < I915_NUM_RINGS; i++)
 202                         err_printf(m, "%02x ", err->rseqno[i]);
 203
 204                 err_printf(m, "] %02x", err->wseqno);
 205                 err_puts(m, pin_flag(err->pinned));
 206                 err_puts(m, tiling_flag(err->tiling));
 207                 err_puts(m, dirty_flag(err->dirty));
 208                 err_puts(m, purgeable_flag(err->purgeable));
 209                 err_puts(m, err->userptr ? " userptr" : "");
 210                 err_puts(m, err->ring != -1 ? " " : "");
 211                 err_puts(m, ring_str(err->ring));
 212                 err_puts(m, i915_cache_level_str(m->i915, err->cache_level));
 213
 214                 if (err->name)
 215                         err_printf(m, " (name: %d)", err->name);
 216                 if (err->fence_reg != I915_FENCE_REG_NONE)
 217                         err_printf(m, " (fence: %d)", err->fence_reg);
 218
 219                 err_puts(m, "\n");
 220                 err++;
 221         }
 222 }
 223
 224 static const char *hangcheck_action_to_str(enum intel_ring_hangcheck_action a)
 225 {
 226         switch (a) {
 227         case HANGCHECK_IDLE:
 228                 return "idle";
 229         case HANGCHECK_WAIT:
 230                 return "wait";
 231         case HANGCHECK_ACTIVE:
 232                 return "active";
 233         case HANGCHECK_ACTIVE_LOOP:
 234                 return "active (loop)";
 235         case HANGCHECK_KICK:
 236                 return "kick";
 237         case HANGCHECK_HUNG:
 238                 return "hung";
 239         }
 240
 241         return "unknown";
 242 }
 243
 244 static void i915_ring_error_state(struct drm_i915_error_state_buf *m,
 245                                   struct drm_device *dev,
 246                                   struct drm_i915_error_state *error,
 247                                   int ring_idx)
 248 {
 249         struct drm_i915_error_ring *ring = &error->ring[ring_idx];
 250
 251         if (!ring->valid)
 252                 return;
 253
 254         err_printf(m, "%s command stream:\n", ring_str(ring_idx));
 255         err_printf(m, "  START: 0x%08x\n", ring->start);
 256         err_printf(m, "  HEAD:  0x%08x\n", ring->head);
 257         err_printf(m, "  TAIL:  0x%08x\n", ring->tail);
 258         err_printf(m, "  CTL:   0x%08x\n", ring->ctl);
 259         err_printf(m, "  HWS:   0x%08x\n", ring->hws);
 260         err_printf(m, "  ACTHD: 0x%08x %08x\n", (u32)(ring->acthd>>32), (u32)ring->acthd);
 261         err_printf(m, "  IPEIR: 0x%08x\n", ring->ipeir);
 262         err_printf(m, "  IPEHR: 0x%08x\n", ring->ipehr);
 263         err_printf(m, "  INSTDONE: 0x%08x\n", ring->instdone);
 264         if (INTEL_INFO(dev)->gen >= 4) {
 265                 err_printf(m, "  BBADDR: 0x%08x %08x\n", (u32)(ring->bbaddr>>32), (u32)ring->bbaddr);
 266                 err_printf(m, "  BB_STATE: 0x%08x\n", ring->bbstate);
 267                 err_printf(m, "  INSTPS: 0x%08x\n", ring->instps);
 268         }
 269         err_printf(m, "  INSTPM: 0x%08x\n", ring->instpm);
 270         err_printf(m, "  FADDR: 0x%08x %08x\n", upper_32_bits(ring->faddr),
 271                    lower_32_bits(ring->faddr));
 272         if (INTEL_INFO(dev)->gen >= 6) {
 273                 err_printf(m, "  RC PSMI: 0x%08x\n", ring->rc_psmi);
 274                 err_printf(m, "  FAULT_REG: 0x%08x\n", ring->fault_reg);
 275                 err_printf(m, "  SYNC_0: 0x%08x [last synced 0x%08x]\n",
 276                            ring->semaphore_mboxes[0],
 277                            ring->semaphore_seqno[0]);
 278                 err_printf(m, "  SYNC_1: 0x%08x [last synced 0x%08x]\n",
 279                            ring->semaphore_mboxes[1],
 280                            ring->semaphore_seqno[1]);
 281                 if (HAS_VEBOX(dev)) {
 282                         err_printf(m, "  SYNC_2: 0x%08x [last synced 0x%08x]\n",
 283                                    ring->semaphore_mboxes[2],
 284                                    ring->semaphore_seqno[2]);
 285                 }
 286         }
 287         if (USES_PPGTT(dev)) {
 288                 err_printf(m, "  GFX_MODE: 0x%08x\n", ring->vm_info.gfx_mode);
 289
 290                 if (INTEL_INFO(dev)->gen >= 8) {
 291                         int i;
 292                         for (i = 0; i < 4; i++)
 293                                 err_printf(m, "  PDP%d: 0x%016llx\n",
 294                                            i, ring->vm_info.pdp[i]);
 295                 } else {
 296                         err_printf(m, "  PP_DIR_BASE: 0x%08x\n",
 297                                    ring->vm_info.pp_dir_base);
 298                 }
 299         }
 300         err_printf(m, "  seqno: 0x%08x\n", ring->seqno);
 301         err_printf(m, "  waiting: %s\n", yesno(ring->waiting));
 302         err_printf(m, "  ring->head: 0x%08x\n", ring->cpu_ring_head);
 303         err_printf(m, "  ring->tail: 0x%08x\n", ring->cpu_ring_tail);
 304         err_printf(m, "  hangcheck: %s [%d]\n",
 305                    hangcheck_action_to_str(ring->hangcheck_action),
 306                    ring->hangcheck_score);
 307 }
 308
 309 void i915_error_printf(struct drm_i915_error_state_buf *e, const char *f, ...)
 310 {
 311         va_list args;
 312
 313         va_start(args, f);
 314         i915_error_vprintf(e, f, args);
 315         va_end(args);
 316 }
 317
 318 static void print_error_obj(struct drm_i915_error_state_buf *m,
 319                             struct drm_i915_error_object *obj)
 320 {
 321         int page, offset, elt;
 322
 323         for (page = offset = 0; page < obj->page_count; page++) {
 324                 for (elt = 0; elt < PAGE_SIZE/4; elt++) {
 325                         err_printf(m, "%08x :  %08x\n", offset,
 326                                    obj->pages[page][elt]);
 327                         offset += 4;
 328                 }
 329         }
 330 }
 331
 332 int i915_error_state_to_str(struct drm_i915_error_state_buf *m,
 333                             const struct i915_error_state_file_priv *error_priv)
 334 {
 335         struct drm_device *dev = error_priv->dev;
 336         struct drm_i915_private *dev_priv = dev->dev_private;
 337         struct drm_i915_error_state *error = error_priv->error;
 338         struct drm_i915_error_object *obj;
 339         int i, j, offset, elt;
 340         int max_hangcheck_score;
 341
 342         if (!error) {
 343                 err_printf(m, "no error state collected\n");
 344                 goto out;
 345         }
 346
 347         err_printf(m, "%s\n", error->error_msg);
 348         err_printf(m, "Time: %ld s %ld us\n", error->time.tv_sec,
 349                    error->time.tv_usec);
 350         err_printf(m, "Kernel: " UTS_RELEASE "\n");
 351         max_hangcheck_score = 0;
 352         for (i = 0; i < ARRAY_SIZE(error->ring); i++) {
 353                 if (error->ring[i].hangcheck_score > max_hangcheck_score)
 354                         max_hangcheck_score = error->ring[i].hangcheck_score;
 355         }
 356         for (i = 0; i < ARRAY_SIZE(error->ring); i++) {
 357                 if (error->ring[i].hangcheck_score == max_hangcheck_score &&
 358                     error->ring[i].pid != -1) {
 359                         err_printf(m, "Active process (on ring %s): %s [%d]\n",
 360                                    ring_str(i),
 361                                    error->ring[i].comm,
 362                                    error->ring[i].pid);
 363                 }
 364         }
 365         err_printf(m, "Reset count: %u\n", error->reset_count);
 366         err_printf(m, "Suspend count: %u\n", error->suspend_count);
 367         err_printf(m, "PCI ID: 0x%04x\n", dev->pdev->device);
 368         err_printf(m, "IOMMU enabled?: %d\n", error->iommu);
 369         err_printf(m, "EIR: 0x%08x\n", error->eir);
 370         err_printf(m, "IER: 0x%08x\n", error->ier);
 371         if (INTEL_INFO(dev)->gen >= 8) {
 372                 for (i = 0; i < 4; i++)
 373                         err_printf(m, "GTIER gt %d: 0x%08x\n", i,
 374                                    error->gtier[i]);
 375         } else if (HAS_PCH_SPLIT(dev) || IS_VALLEYVIEW(dev))
 376                 err_printf(m, "GTIER: 0x%08x\n", error->gtier[0]);
 377         err_printf(m, "PGTBL_ER: 0x%08x\n", error->pgtbl_er);
 378         err_printf(m, "FORCEWAKE: 0x%08x\n", error->forcewake);
 379         err_printf(m, "DERRMR: 0x%08x\n", error->derrmr);
 380         err_printf(m, "CCID: 0x%08x\n", error->ccid);
 381         err_printf(m, "Missed interrupts: 0x%08lx\n", dev_priv->gpu_error.missed_irq_rings);
 382
 383         for (i = 0; i < dev_priv->num_fence_regs; i++)
 384                 err_printf(m, "  fence[%d] = %08llx\n", i, error->fence[i]);
 385
 386         for (i = 0; i < ARRAY_SIZE(error->extra_instdone); i++)
 387                 err_printf(m, "  INSTDONE_%d: 0x%08x\n", i,
 388                            error->extra_instdone[i]);
 389
 390         if (INTEL_INFO(dev)->gen >= 6) {
 391                 err_printf(m, "ERROR: 0x%08x\n", error->error);
 392
 393                 if (INTEL_INFO(dev)->gen >= 8)
 394                         err_printf(m, "FAULT_TLB_DATA: 0x%08x 0x%08x\n",
 395                                    error->fault_data1, error->fault_data0);
 396
 397                 err_printf(m, "DONE_REG: 0x%08x\n", error->done_reg);
 398         }
 399
 400         if (INTEL_INFO(dev)->gen == 7)
 401                 err_printf(m, "ERR_INT: 0x%08x\n", error->err_int);
 402
 403         for (i = 0; i < ARRAY_SIZE(error->ring); i++)
 404                 i915_ring_error_state(m, dev, error, i);
 405
 406         for (i = 0; i < error->vm_count; i++) {
 407                 err_printf(m, "vm[%d]\n", i);
 408
 409                 print_error_buffers(m, "Active",
 410                                     error->active_bo[i],
 411                                     error->active_bo_count[i]);
 412
 413                 print_error_buffers(m, "Pinned",
 414                                     error->pinned_bo[i],
 415                                     error->pinned_bo_count[i]);
 416         }
 417
 418         for (i = 0; i < ARRAY_SIZE(error->ring); i++) {
 419                 obj = error->ring[i].batchbuffer;
 420                 if (obj) {
 421                         err_puts(m, dev_priv->ring[i].name);
 422                         if (error->ring[i].pid != -1)
 423                                 err_printf(m, " (submitted by %s [%d])",
 424                                            error->ring[i].comm,
 425                                            error->ring[i].pid);
 426                         err_printf(m, " --- gtt_offset = 0x%08x %08x\n",
 427                                    upper_32_bits(obj->gtt_offset),
 428                                    lower_32_bits(obj->gtt_offset));
 429                         print_error_obj(m, obj);
 430                 }
 431
 432                 obj = error->ring[i].wa_batchbuffer;
 433                 if (obj) {
 434                         err_printf(m, "%s (w/a) --- gtt_offset = 0x%08x\n",
 435                                    dev_priv->ring[i].name,
 436                                    lower_32_bits(obj->gtt_offset));
 437                         print_error_obj(m, obj);
 438                 }
 439
 440                 if (error->ring[i].num_requests) {
 441                         err_printf(m, "%s --- %d requests\n",
 442                                    dev_priv->ring[i].name,
 443                                    error->ring[i].num_requests);
 444                         for (j = 0; j < error->ring[i].num_requests; j++) {
 445                                 err_printf(m, "  seqno 0x%08x, emitted %ld, tail 0x%08x\n",
 446                                            error->ring[i].requests[j].seqno,
 447                                            error->ring[i].requests[j].jiffies,
 448                                            error->ring[i].requests[j].tail);
 449                         }
 450                 }
 451
 452                 if ((obj = error->ring[i].ringbuffer)) {
 453                         err_printf(m, "%s --- ringbuffer = 0x%08x\n",
 454                                    dev_priv->ring[i].name,
 455                                    lower_32_bits(obj->gtt_offset));
 456                         print_error_obj(m, obj);
 457                 }
 458
 459                 if ((obj = error->ring[i].hws_page)) {
 460                         u64 hws_offset = obj->gtt_offset;
 461                         u32 *hws_page = &obj->pages[0][0];
 462
 463                         if (i915.enable_execlists) {
 464                                 hws_offset += LRC_PPHWSP_PN * PAGE_SIZE;
 465                                 hws_page = &obj->pages[LRC_PPHWSP_PN][0];
 466                         }
 467                         err_printf(m, "%s --- HW Status = 0x%08llx\n",
 468                                    dev_priv->ring[i].name, hws_offset);
 469                         offset = 0;
 470                         for (elt = 0; elt < PAGE_SIZE/16; elt += 4) {
 471                                 err_printf(m, "[%04x] %08x %08x %08x %08x\n",
 472                                            offset,
 473                                            hws_page[elt],
 474                                            hws_page[elt+1],
 475                                            hws_page[elt+2],
 476                                            hws_page[elt+3]);
 477                                         offset += 16;
 478                         }
 479                 }
 480
 481                 if ((obj = error->ring[i].ctx)) {
 482                         err_printf(m, "%s --- HW Context = 0x%08x\n",
 483                                    dev_priv->ring[i].name,
 484                                    lower_32_bits(obj->gtt_offset));
 485                         print_error_obj(m, obj);
 486                 }
 487         }
 488
 489         if ((obj = error->semaphore_obj)) {
 490                 err_printf(m, "Semaphore page = 0x%08x\n",
 491                            lower_32_bits(obj->gtt_offset));
 492                 for (elt = 0; elt < PAGE_SIZE/16; elt += 4) {
 493                         err_printf(m, "[%04x] %08x %08x %08x %08x\n",
 494                                    elt * 4,
 495                                    obj->pages[0][elt],
 496                                    obj->pages[0][elt+1],
 497                                    obj->pages[0][elt+2],
 498                                    obj->pages[0][elt+3]);
 499                 }
 500         }
 501
 502         if (error->overlay)
 503                 intel_overlay_print_error_state(m, error->overlay);
 504
 505         if (error->display)
 506                 intel_display_print_error_state(m, dev, error->display);
 507
 508 out:
 509         if (m->bytes == 0 && m->err)
 510                 return m->err;
 511
 512         return 0;
 513 }
 514
 515 int i915_error_state_buf_init(struct drm_i915_error_state_buf *ebuf,
 516                               struct drm_i915_private *i915,
 517                               size_t count, loff_t pos)
 518 {
 519         memset(ebuf, 0, sizeof(*ebuf));
 520         ebuf->i915 = i915;
 521
 522         /* We need to have enough room to store any i915_error_state printf
 523          * so that we can move it to start position.
 524          */
 525         ebuf->size = count + 1 > PAGE_SIZE ? count + 1 : PAGE_SIZE;
 526         ebuf->buf = kmalloc(ebuf->size,
 527                                 GFP_TEMPORARY | __GFP_NORETRY | __GFP_NOWARN);
 528
 529         if (ebuf->buf == NULL) {
 530                 ebuf->size = PAGE_SIZE;
 531                 ebuf->buf = kmalloc(ebuf->size, GFP_TEMPORARY);
 532         }
 533
 534         if (ebuf->buf == NULL) {
 535                 ebuf->size = 128;
 536                 ebuf->buf = kmalloc(ebuf->size, GFP_TEMPORARY);
 537         }
 538
 539         if (ebuf->buf == NULL)
 540                 return -ENOMEM;
 541
 542         ebuf->start = pos;
 543
 544         return 0;
 545 }
 546
 547 static void i915_error_object_free(struct drm_i915_error_object *obj)
 548 {
 549         int page;
 550
 551         if (obj == NULL)
 552                 return;
 553
 554         for (page = 0; page < obj->page_count; page++)
 555                 kfree(obj->pages[page]);
 556
 557         kfree(obj);
 558 }
 559
 560 static void i915_error_state_free(struct kref *error_ref)
 561 {
 562         struct drm_i915_error_state *error = container_of(error_ref,
 563                                                           typeof(*error), ref);
 564         int i;
 565
 566         for (i = 0; i < ARRAY_SIZE(error->ring); i++) {
 567                 i915_error_object_free(error->ring[i].batchbuffer);
 568                 i915_error_object_free(error->ring[i].wa_batchbuffer);
 569                 i915_error_object_free(error->ring[i].ringbuffer);
 570                 i915_error_object_free(error->ring[i].hws_page);
 571                 i915_error_object_free(error->ring[i].ctx);
 572                 kfree(error->ring[i].requests);
 573         }
 574
 575         i915_error_object_free(error->semaphore_obj);
 576
 577         for (i = 0; i < error->vm_count; i++)
 578                 kfree(error->active_bo[i]);
 579
 580         kfree(error->active_bo);
 581         kfree(error->active_bo_count);
 582         kfree(error->pinned_bo);
 583         kfree(error->pinned_bo_count);
 584         kfree(error->overlay);
 585         kfree(error->display);
 586         kfree(error);
 587 }
 588
 589 static struct drm_i915_error_object *
 590 i915_error_object_create(struct drm_i915_private *dev_priv,
 591                          struct drm_i915_gem_object *src,
 592                          struct i915_address_space *vm)
 593 {
 594         struct drm_i915_error_object *dst;
 595         struct i915_vma *vma = NULL;
 596         int num_pages;
 597         bool use_ggtt;
 598         int i = 0;
 599         u64 reloc_offset;
 600
 601         if (src == NULL || src->pages == NULL)
 602                 return NULL;
 603
 604         num_pages = src->base.size >> PAGE_SHIFT;
 605
 606         dst = kmalloc(sizeof(*dst) + num_pages * sizeof(u32 *), GFP_ATOMIC);
 607         if (dst == NULL)
 608                 return NULL;
 609
 610         if (i915_gem_obj_bound(src, vm))
 611                 dst->gtt_offset = i915_gem_obj_offset(src, vm);
 612         else
 613                 dst->gtt_offset = -1;
 614
 615         reloc_offset = dst->gtt_offset;
 616         if (i915_is_ggtt(vm))
 617                 vma = i915_gem_obj_to_ggtt(src);
 618         use_ggtt = (src->cache_level == I915_CACHE_NONE &&
 619                    vma && (vma->bound & GLOBAL_BIND) &&
 620                    reloc_offset + num_pages * PAGE_SIZE <= dev_priv->gtt.mappable_end);
 621
 622         /* Cannot access stolen address directly, try to use the aperture */
 623         if (src->stolen) {
 624                 use_ggtt = true;
 625
 626                 if (!(vma && vma->bound & GLOBAL_BIND))
 627                         goto unwind;
 628
 629                 reloc_offset = i915_gem_obj_ggtt_offset(src);
 630                 if (reloc_offset + num_pages * PAGE_SIZE > dev_priv->gtt.mappable_end)
 631                         goto unwind;
 632         }
 633
 634         /* Cannot access snooped pages through the aperture */
 635         if (use_ggtt && src->cache_level != I915_CACHE_NONE && !HAS_LLC(dev_priv->dev))
 636                 goto unwind;
 637
 638         dst->page_count = num_pages;
 639         while (num_pages--) {
 640                 unsigned long flags;
 641                 void *d;
 642
 643                 d = kmalloc(PAGE_SIZE, GFP_ATOMIC);
 644                 if (d == NULL)
 645                         goto unwind;
 646
 647                 local_irq_save(flags);
 648                 if (use_ggtt) {
 649                         void __iomem *s;
 650
 651                         /* Simply ignore tiling or any overlapping fence.
 652                          * It's part of the error state, and this hopefully
 653                          * captures what the GPU read.
 654                          */
 655
 656                         s = io_mapping_map_atomic_wc(dev_priv->gtt.mappable,
 657                                                      reloc_offset);
 658                         memcpy_fromio(d, s, PAGE_SIZE);
 659                         io_mapping_unmap_atomic(s);
 660                 } else {
 661                         struct page *page;
 662                         void *s;
 663
 664                         page = i915_gem_object_get_page(src, i);
 665
 666                         drm_clflush_pages(&page, 1);
 667
 668                         s = kmap_atomic(page);
 669                         memcpy(d, s, PAGE_SIZE);
 670                         kunmap_atomic(s);
 671
 672                         drm_clflush_pages(&page, 1);
 673                 }
 674                 local_irq_restore(flags);
 675
 676                 dst->pages[i++] = d;
 677                 reloc_offset += PAGE_SIZE;
 678         }
 679
 680         return dst;
 681
 682 unwind:
 683         while (i--)
 684                 kfree(dst->pages[i]);
 685         kfree(dst);
 686         return NULL;
 687 }
 688 #define i915_error_ggtt_object_create(dev_priv, src) \
 689         i915_error_object_create((dev_priv), (src), &(dev_priv)->gtt.base)
 690
 691 static void capture_bo(struct drm_i915_error_buffer *err,
 692                        struct i915_vma *vma)
 693 {
 694         struct drm_i915_gem_object *obj = vma->obj;
 695         int i;
 696
 697         err->size = obj->base.size;
 698         err->name = obj->base.name;
 699         for (i = 0; i < I915_NUM_RINGS; i++)
 700                 err->rseqno[i] = i915_gem_request_get_seqno(obj->last_read_req[i]);
 701         err->wseqno = i915_gem_request_get_seqno(obj->last_write_req);
 702         err->gtt_offset = vma->node.start;
 703         err->read_domains = obj->base.read_domains;
 704         err->write_domain = obj->base.write_domain;
 705         err->fence_reg = obj->fence_reg;
 706         err->pinned = 0;
 707         if (i915_gem_obj_is_pinned(obj))
 708                 err->pinned = 1;
 709         err->tiling = obj->tiling_mode;
 710         err->dirty = obj->dirty;
 711         err->purgeable = obj->madv != I915_MADV_WILLNEED;
 712         err->userptr = obj->userptr.mm != NULL;
 713         err->ring = obj->last_write_req ?
 714                         i915_gem_request_get_ring(obj->last_write_req)->id : -1;
 715         err->cache_level = obj->cache_level;
 716 }
 717
 718 static u32 capture_active_bo(struct drm_i915_error_buffer *err,
 719                              int count, struct list_head *head)
 720 {
 721         struct i915_vma *vma;
 722         int i = 0;
 723
 724         list_for_each_entry(vma, head, mm_list) {
 725                 capture_bo(err++, vma);
 726                 if (++i == count)
 727                         break;
 728         }
 729
 730         return i;
 731 }
 732
 733 static u32 capture_pinned_bo(struct drm_i915_error_buffer *err,
 734                              int count, struct list_head *head,
 735                              struct i915_address_space *vm)
 736 {
 737         struct drm_i915_gem_object *obj;
 738         struct drm_i915_error_buffer * const first = err;
 739         struct drm_i915_error_buffer * const last = err + count;
 740
 741         list_for_each_entry(obj, head, global_list) {
 742                 struct i915_vma *vma;
 743
 744                 if (err == last)
 745                         break;
 746
 747                 list_for_each_entry(vma, &obj->vma_list, vma_link)
 748                         if (vma->vm == vm && vma->pin_count > 0)
 749                                 capture_bo(err++, vma);
 750         }
 751
 752         return err - first;
 753 }
 754
 755 /* Generate a semi-unique error code. The code is not meant to have meaning, The
 756  * code's only purpose is to try to prevent false duplicated bug reports by
 757  * grossly estimating a GPU error state.
 758  *
 759  * TODO Ideally, hashing the batchbuffer would be a very nice way to determine
 760  * the hang if we could strip the GTT offset information from it.
 761  *
 762  * It's only a small step better than a random number in its current form.
 763  */
 764 static uint32_t i915_error_generate_code(struct drm_i915_private *dev_priv,
 765                                          struct drm_i915_error_state *error,
 766                                          int *ring_id)
 767 {
 768         uint32_t error_code = 0;
 769         int i;
 770
 771         /* IPEHR would be an ideal way to detect errors, as it's the gross
 772          * measure of "the command that hung." However, has some very common
 773          * synchronization commands which almost always appear in the case
 774          * strictly a client bug. Use instdone to differentiate those some.
 775          */
 776         for (i = 0; i < I915_NUM_RINGS; i++) {
 777                 if (error->ring[i].hangcheck_action == HANGCHECK_HUNG) {
 778                         if (ring_id)
 779                                 *ring_id = i;
 780
 781                         return error->ring[i].ipehr ^ error->ring[i].instdone;
 782                 }
 783         }
 784
 785         return error_code;
 786 }
 787
 788 static void i915_gem_record_fences(struct drm_device *dev,
 789                                    struct drm_i915_error_state *error)
 790 {
 791         struct drm_i915_private *dev_priv = dev->dev_private;
 792         int i;
 793
 794         if (IS_GEN3(dev) || IS_GEN2(dev)) {
 795                 for (i = 0; i < 8; i++)
 796                         error->fence[i] = I915_READ(FENCE_REG_830_0 + (i * 4));
 797                 if (IS_I945G(dev) || IS_I945GM(dev) || IS_G33(dev))
 798                         for (i = 0; i < 8; i++)
 799                                 error->fence[i+8] = I915_READ(FENCE_REG_945_8 +
 800                                                               (i * 4));
 801         } else if (IS_GEN5(dev) || IS_GEN4(dev))
 802                 for (i = 0; i < 16; i++)
 803                         error->fence[i] = I915_READ64(FENCE_REG_965_0 +
 804                                                       (i * 8));
 805         else if (INTEL_INFO(dev)->gen >= 6)
 806                 for (i = 0; i < dev_priv->num_fence_regs; i++)
 807                         error->fence[i] = I915_READ64(FENCE_REG_SANDYBRIDGE_0 +
 808                                                       (i * 8));
 809 }
 810
 811
 812 static void gen8_record_semaphore_state(struct drm_i915_private *dev_priv,
 813                                         struct drm_i915_error_state *error,
 814                                         struct intel_engine_cs *ring,
 815                                         struct drm_i915_error_ring *ering)
 816 {
 817         struct intel_engine_cs *to;
 818         int i;
 819
 820         if (!i915_semaphore_is_enabled(dev_priv->dev))
 821                 return;
 822
 823         if (!error->semaphore_obj)
 824                 error->semaphore_obj =
 825                         i915_error_ggtt_object_create(dev_priv,
 826                                                       dev_priv->semaphore_obj);
 827
 828         for_each_ring(to, dev_priv, i) {
 829                 int idx;
 830                 u16 signal_offset;
 831                 u32 *tmp;
 832
 833                 if (ring == to)
 834                         continue;
 835
 836                 signal_offset = (GEN8_SIGNAL_OFFSET(ring, i) & (PAGE_SIZE - 1))
 837                                 / 4;
 838                 tmp = error->semaphore_obj->pages[0];
 839                 idx = intel_ring_sync_index(ring, to);
 840
 841                 ering->semaphore_mboxes[idx] = tmp[signal_offset];
 842                 ering->semaphore_seqno[idx] = ring->semaphore.sync_seqno[idx];
 843         }
 844 }
 845
 846 static void gen6_record_semaphore_state(struct drm_i915_private *dev_priv,
 847                                         struct intel_engine_cs *ring,
 848                                         struct drm_i915_error_ring *ering)
 849 {
 850         ering->semaphore_mboxes[0] = I915_READ(RING_SYNC_0(ring->mmio_base));
 851         ering->semaphore_mboxes[1] = I915_READ(RING_SYNC_1(ring->mmio_base));
 852         ering->semaphore_seqno[0] = ring->semaphore.sync_seqno[0];
 853         ering->semaphore_seqno[1] = ring->semaphore.sync_seqno[1];
 854
 855         if (HAS_VEBOX(dev_priv->dev)) {
 856                 ering->semaphore_mboxes[2] =
 857                         I915_READ(RING_SYNC_2(ring->mmio_base));
 858                 ering->semaphore_seqno[2] = ring->semaphore.sync_seqno[2];
 859         }
 860 }
 861
 862 static void i915_record_ring_state(struct drm_device *dev,
 863                                    struct drm_i915_error_state *error,
 864                                    struct intel_engine_cs *ring,
 865                                    struct drm_i915_error_ring *ering)
 866 {
 867         struct drm_i915_private *dev_priv = dev->dev_private;
 868
 869         if (INTEL_INFO(dev)->gen >= 6) {
 870                 ering->rc_psmi = I915_READ(ring->mmio_base + 0x50);
 871                 ering->fault_reg = I915_READ(RING_FAULT_REG(ring));
 872                 if (INTEL_INFO(dev)->gen >= 8)
 873                         gen8_record_semaphore_state(dev_priv, error, ring, ering);
 874                 else
 875                         gen6_record_semaphore_state(dev_priv, ring, ering);
 876         }
 877
 878         if (INTEL_INFO(dev)->gen >= 4) {
 879                 ering->faddr = I915_READ(RING_DMA_FADD(ring->mmio_base));
 880                 ering->ipeir = I915_READ(RING_IPEIR(ring->mmio_base));
 881                 ering->ipehr = I915_READ(RING_IPEHR(ring->mmio_base));
 882                 ering->instdone = I915_READ(RING_INSTDONE(ring->mmio_base));
 883                 ering->instps = I915_READ(RING_INSTPS(ring->mmio_base));
 884                 ering->bbaddr = I915_READ(RING_BBADDR(ring->mmio_base));
 885                 if (INTEL_INFO(dev)->gen >= 8) {
 886                         ering->faddr |= (u64) I915_READ(RING_DMA_FADD_UDW(ring->mmio_base)) << 32;
 887                         ering->bbaddr |= (u64) I915_READ(RING_BBADDR_UDW(ring->mmio_base)) << 32;
 888                 }
 889                 ering->bbstate = I915_READ(RING_BBSTATE(ring->mmio_base));
 890         } else {
 891                 ering->faddr = I915_READ(DMA_FADD_I8XX);
 892                 ering->ipeir = I915_READ(IPEIR);
 893                 ering->ipehr = I915_READ(IPEHR);
 894                 ering->instdone = I915_READ(INSTDONE);
 895         }
 896
 897         ering->waiting = waitqueue_active(&ring->irq_queue);
 898         ering->instpm = I915_READ(RING_INSTPM(ring->mmio_base));
 899         ering->seqno = ring->get_seqno(ring, false);
 900         ering->acthd = intel_ring_get_active_head(ring);
 901         ering->start = I915_READ_START(ring);
 902         ering->head = I915_READ_HEAD(ring);
 903         ering->tail = I915_READ_TAIL(ring);
 904         ering->ctl = I915_READ_CTL(ring);
 905
 906         if (I915_NEED_GFX_HWS(dev)) {
 907                 int mmio;
 908
 909                 if (IS_GEN7(dev)) {
 910                         switch (ring->id) {
 911                         default:
 912                         case RCS:
 913                                 mmio = RENDER_HWS_PGA_GEN7;
 914                                 break;
 915                         case BCS:
 916                                 mmio = BLT_HWS_PGA_GEN7;
 917                                 break;
 918                         case VCS:
 919                                 mmio = BSD_HWS_PGA_GEN7;
 920                                 break;
 921                         case VECS:
 922                                 mmio = VEBOX_HWS_PGA_GEN7;
 923                                 break;
 924                         }
 925                 } else if (IS_GEN6(ring->dev)) {
 926                         mmio = RING_HWS_PGA_GEN6(ring->mmio_base);
 927                 } else {
 928                         /* XXX: gen8 returns to sanity */
 929                         mmio = RING_HWS_PGA(ring->mmio_base);
 930                 }
 931
 932                 ering->hws = I915_READ(mmio);
 933         }
 934
 935         ering->hangcheck_score = ring->hangcheck.score;
 936         ering->hangcheck_action = ring->hangcheck.action;
 937
 938         if (USES_PPGTT(dev)) {
 939                 int i;
 940
 941                 ering->vm_info.gfx_mode = I915_READ(RING_MODE_GEN7(ring));
 942
 943                 if (IS_GEN6(dev))
 944                         ering->vm_info.pp_dir_base =
 945                                 I915_READ(RING_PP_DIR_BASE_READ(ring));
 946                 else if (IS_GEN7(dev))
 947                         ering->vm_info.pp_dir_base =
 948                                 I915_READ(RING_PP_DIR_BASE(ring));
 949                 else if (INTEL_INFO(dev)->gen >= 8)
 950                         for (i = 0; i < 4; i++) {
 951                                 ering->vm_info.pdp[i] =
 952                                         I915_READ(GEN8_RING_PDP_UDW(ring, i));
 953                                 ering->vm_info.pdp[i] <<= 32;
 954                                 ering->vm_info.pdp[i] |=
 955                                         I915_READ(GEN8_RING_PDP_LDW(ring, i));
 956                         }
 957         }
 958 }
 959
 960
 961 static void i915_gem_record_active_context(struct intel_engine_cs *ring,
 962                                            struct drm_i915_error_state *error,
 963                                            struct drm_i915_error_ring *ering)
 964 {
 965         struct drm_i915_private *dev_priv = ring->dev->dev_private;
 966         struct drm_i915_gem_object *obj;
 967
 968         /* Currently render ring is the only HW context user */
 969         if (ring->id != RCS || !error->ccid)
 970                 return;
 971
 972         list_for_each_entry(obj, &dev_priv->mm.bound_list, global_list) {
 973                 if (!i915_gem_obj_ggtt_bound(obj))
 974                         continue;
 975
 976                 if ((error->ccid & PAGE_MASK) == i915_gem_obj_ggtt_offset(obj)) {
 977                         ering->ctx = i915_error_ggtt_object_create(dev_priv, obj);
 978                         break;
 979                 }
 980         }
 981 }
 982
 983 static void i915_gem_record_rings(struct drm_device *dev,
 984                                   struct drm_i915_error_state *error)
 985 {
 986         struct drm_i915_private *dev_priv = dev->dev_private;
 987         struct drm_i915_gem_request *request;
 988         int i, count;
 989
 990         for (i = 0; i < I915_NUM_RINGS; i++) {
 991                 struct intel_engine_cs *ring = &dev_priv->ring[i];
 992                 struct intel_ringbuffer *rbuf;
 993
 994                 error->ring[i].pid = -1;
 995
 996                 if (ring->dev == NULL)
 997                         continue;
 998
 999                 error->ring[i].valid = true;
1000
1001                 i915_record_ring_state(dev, error, ring, &error->ring[i]);
1002
1003                 request = i915_gem_find_active_request(ring);
1004                 if (request) {
1005                         struct i915_address_space *vm;
1006
1007                         vm = request->ctx && request->ctx->ppgtt ?
1008                                 &request->ctx->ppgtt->base :
1009                                 &dev_priv->gtt.base;
1010
1011                         /* We need to copy these to an anonymous buffer
1012                          * as the simplest method to avoid being overwritten
1013                          * by userspace.
1014                          */
1015                         error->ring[i].batchbuffer =
1016                                 i915_error_object_create(dev_priv,
1017                                                          request->batch_obj,
1018                                                          vm);
1019
1020                         if (HAS_BROKEN_CS_TLB(dev_priv->dev))
1021                                 error->ring[i].wa_batchbuffer =
1022                                         i915_error_ggtt_object_create(dev_priv,
1023                                                              ring->scratch.obj);
1024
1025                         if (request->pid) {
1026                                 struct task_struct *task;
1027
1028                                 rcu_read_lock();
1029                                 task = pid_task(request->pid, PIDTYPE_PID);
1030                                 if (task) {
1031                                         strcpy(error->ring[i].comm, task->comm);
1032                                         error->ring[i].pid = task->pid;
1033                                 }
1034                                 rcu_read_unlock();
1035                         }
1036                 }
1037
1038                 if (i915.enable_execlists) {
1039                         /* TODO: This is only a small fix to keep basic error
1040                          * capture working, but we need to add more information
1041                          * for it to be useful (e.g. dump the context being
1042                          * executed).
1043                          */
1044                         if (request)
1045                                 rbuf = request->ctx->engine[ring->id].ringbuf;
1046                         else
1047                                 rbuf = ring->default_context->engine[ring->id].ringbuf;
1048                 } else
1049                         rbuf = ring->buffer;
1050
1051                 error->ring[i].cpu_ring_head = rbuf->head;
1052                 error->ring[i].cpu_ring_tail = rbuf->tail;
1053
1054                 error->ring[i].ringbuffer =
1055                         i915_error_ggtt_object_create(dev_priv, rbuf->obj);
1056
1057                 error->ring[i].hws_page =
1058                         i915_error_ggtt_object_create(dev_priv, ring->status_page.obj);
1059
1060                 i915_gem_record_active_context(ring, error, &error->ring[i]);
1061
1062                 count = 0;
1063                 list_for_each_entry(request, &ring->request_list, list)
1064                         count++;
1065
1066                 error->ring[i].num_requests = count;
1067                 error->ring[i].requests =
1068                         kcalloc(count, sizeof(*error->ring[i].requests),
1069                                 GFP_ATOMIC);
1070                 if (error->ring[i].requests == NULL) {
1071                         error->ring[i].num_requests = 0;
1072                         continue;
1073                 }
1074
1075                 count = 0;
1076                 list_for_each_entry(request, &ring->request_list, list) {
1077                         struct drm_i915_error_request *erq;
1078
1079                         erq = &error->ring[i].requests[count++];
1080                         erq->seqno = request->seqno;
1081                         erq->jiffies = request->emitted_jiffies;
1082                         erq->tail = request->postfix;
1083                 }
1084         }
1085 }
1086
1087 /* FIXME: Since pin count/bound list is global, we duplicate what we capture per
1088  * VM.
1089  */
1090 static void i915_gem_capture_vm(struct drm_i915_private *dev_priv,
1091                                 struct drm_i915_error_state *error,
1092                                 struct i915_address_space *vm,
1093                                 const int ndx)
1094 {
1095         struct drm_i915_error_buffer *active_bo = NULL, *pinned_bo = NULL;
1096         struct drm_i915_gem_object *obj;
1097         struct i915_vma *vma;
1098         int i;
1099
1100         i = 0;
1101         list_for_each_entry(vma, &vm->active_list, mm_list)
1102                 i++;
1103         error->active_bo_count[ndx] = i;
1104
1105         list_for_each_entry(obj, &dev_priv->mm.bound_list, global_list) {
1106                 list_for_each_entry(vma, &obj->vma_list, vma_link)
1107                         if (vma->vm == vm && vma->pin_count > 0)
1108                                 i++;
1109         }
1110         error->pinned_bo_count[ndx] = i - error->active_bo_count[ndx];
1111
1112         if (i) {
1113                 active_bo = kcalloc(i, sizeof(*active_bo), GFP_ATOMIC);
1114                 if (active_bo)
1115                         pinned_bo = active_bo + error->active_bo_count[ndx];
1116         }
1117
1118         if (active_bo)
1119                 error->active_bo_count[ndx] =
1120                         capture_active_bo(active_bo,
1121                                           error->active_bo_count[ndx],
1122                                           &vm->active_list);
1123
1124         if (pinned_bo)
1125                 error->pinned_bo_count[ndx] =
1126                         capture_pinned_bo(pinned_bo,
1127                                           error->pinned_bo_count[ndx],
1128                                           &dev_priv->mm.bound_list, vm);
1129         error->active_bo[ndx] = active_bo;
1130         error->pinned_bo[ndx] = pinned_bo;
1131 }
1132
1133 static void i915_gem_capture_buffers(struct drm_i915_private *dev_priv,
1134                                      struct drm_i915_error_state *error)
1135 {
1136         struct i915_address_space *vm;
1137         int cnt = 0, i = 0;
1138
1139         list_for_each_entry(vm, &dev_priv->vm_list, global_link)
1140                 cnt++;
1141
1142         error->active_bo = kcalloc(cnt, sizeof(*error->active_bo), GFP_ATOMIC);
1143         error->pinned_bo = kcalloc(cnt, sizeof(*error->pinned_bo), GFP_ATOMIC);
1144         error->active_bo_count = kcalloc(cnt, sizeof(*error->active_bo_count),
1145                                          GFP_ATOMIC);
1146         error->pinned_bo_count = kcalloc(cnt, sizeof(*error->pinned_bo_count),
1147                                          GFP_ATOMIC);
1148
1149         if (error->active_bo == NULL ||
1150             error->pinned_bo == NULL ||
1151             error->active_bo_count == NULL ||
1152             error->pinned_bo_count == NULL) {
1153                 kfree(error->active_bo);
1154                 kfree(error->active_bo_count);
1155                 kfree(error->pinned_bo);
1156                 kfree(error->pinned_bo_count);
1157
1158                 error->active_bo = NULL;
1159                 error->active_bo_count = NULL;
1160                 error->pinned_bo = NULL;
1161                 error->pinned_bo_count = NULL;
1162         } else {
1163                 list_for_each_entry(vm, &dev_priv->vm_list, global_link)
1164                         i915_gem_capture_vm(dev_priv, error, vm, i++);
1165
1166                 error->vm_count = cnt;
1167         }
1168 }
1169
1170 /* Capture all registers which don't fit into another category. */
1171 static void i915_capture_reg_state(struct drm_i915_private *dev_priv,
1172                                    struct drm_i915_error_state *error)
1173 {
1174         struct drm_device *dev = dev_priv->dev;
1175         int i;
1176
1177         /* General organization
1178          * 1. Registers specific to a single generation
1179          * 2. Registers which belong to multiple generations
1180          * 3. Feature specific registers.
1181          * 4. Everything else
1182          * Please try to follow the order.
1183          */
1184
1185         /* 1: Registers specific to a single generation */
1186         if (IS_VALLEYVIEW(dev)) {
1187                 error->gtier[0] = I915_READ(GTIER);
1188                 error->ier = I915_READ(VLV_IER);
1189                 error->forcewake = I915_READ(FORCEWAKE_VLV);
1190         }
1191
1192         if (IS_GEN7(dev))
1193                 error->err_int = I915_READ(GEN7_ERR_INT);
1194
1195         if (INTEL_INFO(dev)->gen >= 8) {
1196                 error->fault_data0 = I915_READ(GEN8_FAULT_TLB_DATA0);
1197                 error->fault_data1 = I915_READ(GEN8_FAULT_TLB_DATA1);
1198         }
1199
1200         if (IS_GEN6(dev)) {
1201                 error->forcewake = I915_READ(FORCEWAKE);
1202                 error->gab_ctl = I915_READ(GAB_CTL);
1203                 error->gfx_mode = I915_READ(GFX_MODE);
1204         }
1205
1206         /* 2: Registers which belong to multiple generations */
1207         if (INTEL_INFO(dev)->gen >= 7)
1208                 error->forcewake = I915_READ(FORCEWAKE_MT);
1209
1210         if (INTEL_INFO(dev)->gen >= 6) {
1211                 error->derrmr = I915_READ(DERRMR);
1212                 error->error = I915_READ(ERROR_GEN6);
1213                 error->done_reg = I915_READ(DONE_REG);
1214         }
1215
1216         /* 3: Feature specific registers */
1217         if (IS_GEN6(dev) || IS_GEN7(dev)) {
1218                 error->gam_ecochk = I915_READ(GAM_ECOCHK);
1219                 error->gac_eco = I915_READ(GAC_ECO_BITS);
1220         }
1221
1222         /* 4: Everything else */
1223         if (HAS_HW_CONTEXTS(dev))
1224                 error->ccid = I915_READ(CCID);
1225
1226         if (INTEL_INFO(dev)->gen >= 8) {
1227                 error->ier = I915_READ(GEN8_DE_MISC_IER);
1228                 for (i = 0; i < 4; i++)
1229                         error->gtier[i] = I915_READ(GEN8_GT_IER(i));
1230         } else if (HAS_PCH_SPLIT(dev)) {
1231                 error->ier = I915_READ(DEIER);
1232                 error->gtier[0] = I915_READ(GTIER);
1233         } else if (IS_GEN2(dev)) {
1234                 error->ier = I915_READ16(IER);
1235         } else if (!IS_VALLEYVIEW(dev)) {
1236                 error->ier = I915_READ(IER);
1237         }
1238         error->eir = I915_READ(EIR);
1239         error->pgtbl_er = I915_READ(PGTBL_ER);
1240
1241         i915_get_extra_instdone(dev, error->extra_instdone);
1242 }
1243
1244 static void i915_error_capture_msg(struct drm_device *dev,
1245                                    struct drm_i915_error_state *error,
1246                                    bool wedged,
1247                                    const char *error_msg)
1248 {
1249         struct drm_i915_private *dev_priv = dev->dev_private;
1250         u32 ecode;
1251         int ring_id = -1, len;
1252
1253         ecode = i915_error_generate_code(dev_priv, error, &ring_id);
1254
1255         len = scnprintf(error->error_msg, sizeof(error->error_msg),
1256                         "GPU HANG: ecode %d:%d:0x%08x",
1257                         INTEL_INFO(dev)->gen, ring_id, ecode);
1258
1259         if (ring_id != -1 && error->ring[ring_id].pid != -1)
1260                 len += scnprintf(error->error_msg + len,
1261                                  sizeof(error->error_msg) - len,
1262                                  ", in %s [%d]",
1263                                  error->ring[ring_id].comm,
1264                                  error->ring[ring_id].pid);
1265
1266         scnprintf(error->error_msg + len, sizeof(error->error_msg) - len,
1267                   ", reason: %s, action: %s",
1268                   error_msg,
1269                   wedged ? "reset" : "continue");
1270 }
1271
1272 static void i915_capture_gen_state(struct drm_i915_private *dev_priv,
1273                                    struct drm_i915_error_state *error)
1274 {
1275         error->iommu = -1;
1276 #ifdef CONFIG_INTEL_IOMMU
1277         error->iommu = intel_iommu_gfx_mapped;
1278 #endif
1279         error->reset_count = i915_reset_count(&dev_priv->gpu_error);
1280         error->suspend_count = dev_priv->suspend_count;
1281 }
1282
1283 /**
1284  * i915_capture_error_state - capture an error record for later analysis
1285  * @dev: drm device
1286  *
1287  * Should be called when an error is detected (either a hang or an error
1288  * interrupt) to capture error state from the time of the error.  Fills
1289  * out a structure which becomes available in debugfs for user level tools
1290  * to pick up.
1291  */
1292 void i915_capture_error_state(struct drm_device *dev, bool wedged,
1293                               const char *error_msg)
1294 {
1295         static bool warned;
1296         struct drm_i915_private *dev_priv = dev->dev_private;
1297         struct drm_i915_error_state *error;
1298         unsigned long flags;
1299
1300         /* Account for pipe specific data like PIPE*STAT */
1301         error = kzalloc(sizeof(*error), GFP_ATOMIC);
1302         if (!error) {
1303                 DRM_DEBUG_DRIVER("out of memory, not capturing error state\n");
1304                 return;
1305         }
1306
1307         kref_init(&error->ref);
1308
1309         i915_capture_gen_state(dev_priv, error);
1310         i915_capture_reg_state(dev_priv, error);
1311         i915_gem_capture_buffers(dev_priv, error);
1312         i915_gem_record_fences(dev, error);
1313         i915_gem_record_rings(dev, error);
1314
1315         do_gettimeofday(&error->time);
1316
1317         error->overlay = intel_overlay_capture_error_state(dev);
1318         error->display = intel_display_capture_error_state(dev);
1319
1320         i915_error_capture_msg(dev, error, wedged, error_msg);
1321         DRM_INFO("%s\n", error->error_msg);
1322
1323         spin_lock_irqsave(&dev_priv->gpu_error.lock, flags);
1324         if (dev_priv->gpu_error.first_error == NULL) {
1325                 dev_priv->gpu_error.first_error = error;
1326                 error = NULL;
1327         }
1328         spin_unlock_irqrestore(&dev_priv->gpu_error.lock, flags);
1329
1330         if (error) {
1331                 i915_error_state_free(&error->ref);
1332                 return;
1333         }
1334
1335         if (!warned) {
1336                 DRM_INFO("GPU hangs can indicate a bug anywhere in the entire gfx stack, including userspace.\n");
1337                 DRM_INFO("Please file a _new_ bug report on bugs.freedesktop.org against DRI -> DRM/Intel\n");
1338                 DRM_INFO("drm/i915 developers can then reassign to the right component if it's not a kernel issue.\n");
1339                 DRM_INFO("The gpu crash dump is required to analyze gpu hangs, so please always attach it.\n");
1340                 DRM_INFO("GPU crash dump saved to /sys/class/drm/card%d/error\n", dev->primary->index);
1341                 warned = true;
1342         }
1343 }
1344
1345 void i915_error_state_get(struct drm_device *dev,
1346                           struct i915_error_state_file_priv *error_priv)
1347 {
1348         struct drm_i915_private *dev_priv = dev->dev_private;
1349
1350         spin_lock_irq(&dev_priv->gpu_error.lock);
1351         error_priv->error = dev_priv->gpu_error.first_error;
1352         if (error_priv->error)
1353                 kref_get(&error_priv->error->ref);
1354         spin_unlock_irq(&dev_priv->gpu_error.lock);
1355
1356 }
1357
1358 void i915_error_state_put(struct i915_error_state_file_priv *error_priv)
1359 {
1360         if (error_priv->error)
1361                 kref_put(&error_priv->error->ref, i915_error_state_free);
1362 }
1363
1364 void i915_destroy_error_state(struct drm_device *dev)
1365 {
1366         struct drm_i915_private *dev_priv = dev->dev_private;
1367         struct drm_i915_error_state *error;
1368
1369         spin_lock_irq(&dev_priv->gpu_error.lock);
1370         error = dev_priv->gpu_error.first_error;
1371         dev_priv->gpu_error.first_error = NULL;
1372         spin_unlock_irq(&dev_priv->gpu_error.lock);
1373
1374         if (error)
1375                 kref_put(&error->ref, i915_error_state_free);
1376 }
1377
1378 const char *i915_cache_level_str(struct drm_i915_private *i915, int type)
1379 {
1380         switch (type) {
1381         case I915_CACHE_NONE: return " uncached";
1382         case I915_CACHE_LLC: return HAS_LLC(i915) ? " LLC" : " snooped";
1383         case I915_CACHE_L3_LLC: return " L3+LLC";
1384         case I915_CACHE_WT: return " WT";
1385         default: return "";
1386         }
1387 }
1388
1389 /* NB: please notice the memset */
1390 void i915_get_extra_instdone(struct drm_device *dev, uint32_t *instdone)
1391 {
1392         struct drm_i915_private *dev_priv = dev->dev_private;
1393         memset(instdone, 0, sizeof(*instdone) * I915_NUM_INSTDONE_REG);
1394
1395         if (IS_GEN2(dev) || IS_GEN3(dev))
1396                 instdone[0] = I915_READ(INSTDONE);
1397         else if (IS_GEN4(dev) || IS_GEN5(dev) || IS_GEN6(dev)) {
1398                 instdone[0] = I915_READ(INSTDONE_I965);
1399                 instdone[1] = I915_READ(INSTDONE1);
1400         } else if (INTEL_INFO(dev)->gen >= 7) {
1401                 instdone[0] = I915_READ(GEN7_INSTDONE_1);
1402                 instdone[1] = I915_READ(GEN7_SC_INSTDONE);
1403                 instdone[2] = I915_READ(GEN7_SAMPLER_INSTDONE);
1404                 instdone[3] = I915_READ(GEN7_ROW_INSTDONE);
1405         }
1406 }