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