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 <linux/ascii85.h>
  31 #include <linux/highmem.h>
  32 #include <linux/nmi.h>
  33 #include <linux/pagevec.h>
  34 #include <linux/scatterlist.h>
  35 #include <linux/string_helpers.h>
  36 #include <linux/utsname.h>
  37 #include <linux/zlib.h>
  38
  39 #include <drm/drm_cache.h>
  40 #include <drm/drm_print.h>
  41
  42 #include "display/intel_dmc.h"
  43 #include "display/intel_overlay.h"
  44
  45 #include "gem/i915_gem_context.h"
  46 #include "gem/i915_gem_lmem.h"
  47 #include "gt/intel_engine_regs.h"
  48 #include "gt/intel_gt.h"
  49 #include "gt/intel_gt_mcr.h"
  50 #include "gt/intel_gt_pm.h"
  51 #include "gt/intel_gt_regs.h"
  52 #include "gt/uc/intel_guc_capture.h"
  53
  54 #include "i915_driver.h"
  55 #include "i915_drv.h"
  56 #include "i915_gpu_error.h"
  57 #include "i915_memcpy.h"
  58 #include "i915_reg.h"
  59 #include "i915_scatterlist.h"
  60 #include "i915_utils.h"
  61
  62 #define ALLOW_FAIL (__GFP_KSWAPD_RECLAIM | __GFP_RETRY_MAYFAIL | __GFP_NOWARN)
  63 #define ATOMIC_MAYFAIL (GFP_ATOMIC | __GFP_NOWARN)
  64
  65 static void __sg_set_buf(struct scatterlist *sg,
  66                          void *addr, unsigned int len, loff_t it)
  67 {
  68         sg->page_link = (unsigned long)virt_to_page(addr);
  69         sg->offset = offset_in_page(addr);
  70         sg->length = len;
  71         sg->dma_address = it;
  72 }
  73
  74 static bool __i915_error_grow(struct drm_i915_error_state_buf *e, size_t len)
  75 {
  76         if (!len)
  77                 return false;
  78
  79         if (e->bytes + len + 1 <= e->size)
  80                 return true;
  81
  82         if (e->bytes) {
  83                 __sg_set_buf(e->cur++, e->buf, e->bytes, e->iter);
  84                 e->iter += e->bytes;
  85                 e->buf = NULL;
  86                 e->bytes = 0;
  87         }
  88
  89         if (e->cur == e->end) {
  90                 struct scatterlist *sgl;
  91
  92                 sgl = (typeof(sgl))__get_free_page(ALLOW_FAIL);
  93                 if (!sgl) {
  94                         e->err = -ENOMEM;
  95                         return false;
  96                 }
  97
  98                 if (e->cur) {
  99                         e->cur->offset = 0;
 100                         e->cur->length = 0;
 101                         e->cur->page_link =
 102                                 (unsigned long)sgl | SG_CHAIN;
 103                 } else {
 104                         e->sgl = sgl;
 105                 }
 106
 107                 e->cur = sgl;
 108                 e->end = sgl + SG_MAX_SINGLE_ALLOC - 1;
 109         }
 110
 111         e->size = ALIGN(len + 1, SZ_64K);
 112         e->buf = kmalloc(e->size, ALLOW_FAIL);
 113         if (!e->buf) {
 114                 e->size = PAGE_ALIGN(len + 1);
 115                 e->buf = kmalloc(e->size, GFP_KERNEL);
 116         }
 117         if (!e->buf) {
 118                 e->err = -ENOMEM;
 119                 return false;
 120         }
 121
 122         return true;
 123 }
 124
 125 __printf(2, 0)
 126 static void i915_error_vprintf(struct drm_i915_error_state_buf *e,
 127                                const char *fmt, va_list args)
 128 {
 129         va_list ap;
 130         int len;
 131
 132         if (e->err)
 133                 return;
 134
 135         va_copy(ap, args);
 136         len = vsnprintf(NULL, 0, fmt, ap);
 137         va_end(ap);
 138         if (len <= 0) {
 139                 e->err = len;
 140                 return;
 141         }
 142
 143         if (!__i915_error_grow(e, len))
 144                 return;
 145
 146         GEM_BUG_ON(e->bytes >= e->size);
 147         len = vscnprintf(e->buf + e->bytes, e->size - e->bytes, fmt, args);
 148         if (len < 0) {
 149                 e->err = len;
 150                 return;
 151         }
 152         e->bytes += len;
 153 }
 154
 155 static void i915_error_puts(struct drm_i915_error_state_buf *e, const char *str)
 156 {
 157         unsigned len;
 158
 159         if (e->err || !str)
 160                 return;
 161
 162         len = strlen(str);
 163         if (!__i915_error_grow(e, len))
 164                 return;
 165
 166         GEM_BUG_ON(e->bytes + len > e->size);
 167         memcpy(e->buf + e->bytes, str, len);
 168         e->bytes += len;
 169 }
 170
 171 #define err_printf(e, ...) i915_error_printf(e, __VA_ARGS__)
 172 #define err_puts(e, s) i915_error_puts(e, s)
 173
 174 static void __i915_printfn_error(struct drm_printer *p, struct va_format *vaf)
 175 {
 176         i915_error_vprintf(p->arg, vaf->fmt, *vaf->va);
 177 }
 178
 179 static inline struct drm_printer
 180 i915_error_printer(struct drm_i915_error_state_buf *e)
 181 {
 182         struct drm_printer p = {
 183                 .printfn = __i915_printfn_error,
 184                 .arg = e,
 185         };
 186         return p;
 187 }
 188
 189 /* single threaded page allocator with a reserved stash for emergencies */
 190 static void pool_fini(struct folio_batch *fbatch)
 191 {
 192         folio_batch_release(fbatch);
 193 }
 194
 195 static int pool_refill(struct folio_batch *fbatch, gfp_t gfp)
 196 {
 197         while (folio_batch_space(fbatch)) {
 198                 struct folio *folio;
 199
 200                 folio = folio_alloc(gfp, 0);
 201                 if (!folio)
 202                         return -ENOMEM;
 203
 204                 folio_batch_add(fbatch, folio);
 205         }
 206
 207         return 0;
 208 }
 209
 210 static int pool_init(struct folio_batch *fbatch, gfp_t gfp)
 211 {
 212         int err;
 213
 214         folio_batch_init(fbatch);
 215
 216         err = pool_refill(fbatch, gfp);
 217         if (err)
 218                 pool_fini(fbatch);
 219
 220         return err;
 221 }
 222
 223 static void *pool_alloc(struct folio_batch *fbatch, gfp_t gfp)
 224 {
 225         struct folio *folio;
 226
 227         folio = folio_alloc(gfp, 0);
 228         if (!folio && folio_batch_count(fbatch))
 229                 folio = fbatch->folios[--fbatch->nr];
 230
 231         return folio ? folio_address(folio) : NULL;
 232 }
 233
 234 static void pool_free(struct folio_batch *fbatch, void *addr)
 235 {
 236         struct folio *folio = virt_to_folio(addr);
 237
 238         if (folio_batch_space(fbatch))
 239                 folio_batch_add(fbatch, folio);
 240         else
 241                 folio_put(folio);
 242 }
 243
 244 #ifdef CONFIG_DRM_I915_COMPRESS_ERROR
 245
 246 struct i915_vma_compress {
 247         struct folio_batch pool;
 248         struct z_stream_s zstream;
 249         void *tmp;
 250 };
 251
 252 static bool compress_init(struct i915_vma_compress *c)
 253 {
 254         struct z_stream_s *zstream = &c->zstream;
 255
 256         if (pool_init(&c->pool, ALLOW_FAIL))
 257                 return false;
 258
 259         zstream->workspace =
 260                 kmalloc(zlib_deflate_workspacesize(MAX_WBITS, MAX_MEM_LEVEL),
 261                         ALLOW_FAIL);
 262         if (!zstream->workspace) {
 263                 pool_fini(&c->pool);
 264                 return false;
 265         }
 266
 267         c->tmp = NULL;
 268         if (i915_has_memcpy_from_wc())
 269                 c->tmp = pool_alloc(&c->pool, ALLOW_FAIL);
 270
 271         return true;
 272 }
 273
 274 static bool compress_start(struct i915_vma_compress *c)
 275 {
 276         struct z_stream_s *zstream = &c->zstream;
 277         void *workspace = zstream->workspace;
 278
 279         memset(zstream, 0, sizeof(*zstream));
 280         zstream->workspace = workspace;
 281
 282         return zlib_deflateInit(zstream, Z_DEFAULT_COMPRESSION) == Z_OK;
 283 }
 284
 285 static void *compress_next_page(struct i915_vma_compress *c,
 286                                 struct i915_vma_coredump *dst)
 287 {
 288         void *page_addr;
 289         struct page *page;
 290
 291         page_addr = pool_alloc(&c->pool, ALLOW_FAIL);
 292         if (!page_addr)
 293                 return ERR_PTR(-ENOMEM);
 294
 295         page = virt_to_page(page_addr);
 296         list_add_tail(&page->lru, &dst->page_list);
 297         return page_addr;
 298 }
 299
 300 static int compress_page(struct i915_vma_compress *c,
 301                          void *src,
 302                          struct i915_vma_coredump *dst,
 303                          bool wc)
 304 {
 305         struct z_stream_s *zstream = &c->zstream;
 306
 307         zstream->next_in = src;
 308         if (wc && c->tmp && i915_memcpy_from_wc(c->tmp, src, PAGE_SIZE))
 309                 zstream->next_in = c->tmp;
 310         zstream->avail_in = PAGE_SIZE;
 311
 312         do {
 313                 if (zstream->avail_out == 0) {
 314                         zstream->next_out = compress_next_page(c, dst);
 315                         if (IS_ERR(zstream->next_out))
 316                                 return PTR_ERR(zstream->next_out);
 317
 318                         zstream->avail_out = PAGE_SIZE;
 319                 }
 320
 321                 if (zlib_deflate(zstream, Z_NO_FLUSH) != Z_OK)
 322                         return -EIO;
 323
 324                 cond_resched();
 325         } while (zstream->avail_in);
 326
 327         /* Fallback to uncompressed if we increase size? */
 328         if (0 && zstream->total_out > zstream->total_in)
 329                 return -E2BIG;
 330
 331         return 0;
 332 }
 333
 334 static int compress_flush(struct i915_vma_compress *c,
 335                           struct i915_vma_coredump *dst)
 336 {
 337         struct z_stream_s *zstream = &c->zstream;
 338
 339         do {
 340                 switch (zlib_deflate(zstream, Z_FINISH)) {
 341                 case Z_OK: /* more space requested */
 342                         zstream->next_out = compress_next_page(c, dst);
 343                         if (IS_ERR(zstream->next_out))
 344                                 return PTR_ERR(zstream->next_out);
 345
 346                         zstream->avail_out = PAGE_SIZE;
 347                         break;
 348
 349                 case Z_STREAM_END:
 350                         goto end;
 351
 352                 default: /* any error */
 353                         return -EIO;
 354                 }
 355         } while (1);
 356
 357 end:
 358         memset(zstream->next_out, 0, zstream->avail_out);
 359         dst->unused = zstream->avail_out;
 360         return 0;
 361 }
 362
 363 static void compress_finish(struct i915_vma_compress *c)
 364 {
 365         zlib_deflateEnd(&c->zstream);
 366 }
 367
 368 static void compress_fini(struct i915_vma_compress *c)
 369 {
 370         kfree(c->zstream.workspace);
 371         if (c->tmp)
 372                 pool_free(&c->pool, c->tmp);
 373         pool_fini(&c->pool);
 374 }
 375
 376 static void err_compression_marker(struct drm_i915_error_state_buf *m)
 377 {
 378         err_puts(m, ":");
 379 }
 380
 381 #else
 382
 383 struct i915_vma_compress {
 384         struct folio_batch pool;
 385 };
 386
 387 static bool compress_init(struct i915_vma_compress *c)
 388 {
 389         return pool_init(&c->pool, ALLOW_FAIL) == 0;
 390 }
 391
 392 static bool compress_start(struct i915_vma_compress *c)
 393 {
 394         return true;
 395 }
 396
 397 static int compress_page(struct i915_vma_compress *c,
 398                          void *src,
 399                          struct i915_vma_coredump *dst,
 400                          bool wc)
 401 {
 402         void *ptr;
 403
 404         ptr = pool_alloc(&c->pool, ALLOW_FAIL);
 405         if (!ptr)
 406                 return -ENOMEM;
 407
 408         if (!(wc && i915_memcpy_from_wc(ptr, src, PAGE_SIZE)))
 409                 memcpy(ptr, src, PAGE_SIZE);
 410         list_add_tail(&virt_to_page(ptr)->lru, &dst->page_list);
 411         cond_resched();
 412
 413         return 0;
 414 }
 415
 416 static int compress_flush(struct i915_vma_compress *c,
 417                           struct i915_vma_coredump *dst)
 418 {
 419         return 0;
 420 }
 421
 422 static void compress_finish(struct i915_vma_compress *c)
 423 {
 424 }
 425
 426 static void compress_fini(struct i915_vma_compress *c)
 427 {
 428         pool_fini(&c->pool);
 429 }
 430
 431 static void err_compression_marker(struct drm_i915_error_state_buf *m)
 432 {
 433         err_puts(m, "~");
 434 }
 435
 436 #endif
 437
 438 static void error_print_instdone(struct drm_i915_error_state_buf *m,
 439                                  const struct intel_engine_coredump *ee)
 440 {
 441         int slice;
 442         int subslice;
 443         int iter;
 444
 445         err_printf(m, "  INSTDONE: 0x%08x\n",
 446                    ee->instdone.instdone);
 447
 448         if (ee->engine->class != RENDER_CLASS || GRAPHICS_VER(m->i915) <= 3)
 449                 return;
 450
 451         err_printf(m, "  SC_INSTDONE: 0x%08x\n",
 452                    ee->instdone.slice_common);
 453
 454         if (GRAPHICS_VER(m->i915) <= 6)
 455                 return;
 456
 457         for_each_ss_steering(iter, ee->engine->gt, slice, subslice)
 458                 err_printf(m, "  SAMPLER_INSTDONE[%d][%d]: 0x%08x\n",
 459                            slice, subslice,
 460                            ee->instdone.sampler[slice][subslice]);
 461
 462         for_each_ss_steering(iter, ee->engine->gt, slice, subslice)
 463                 err_printf(m, "  ROW_INSTDONE[%d][%d]: 0x%08x\n",
 464                            slice, subslice,
 465                            ee->instdone.row[slice][subslice]);
 466
 467         if (GRAPHICS_VER(m->i915) < 12)
 468                 return;
 469
 470         if (GRAPHICS_VER_FULL(m->i915) >= IP_VER(12, 55)) {
 471                 for_each_ss_steering(iter, ee->engine->gt, slice, subslice)
 472                         err_printf(m, "  GEOM_SVGUNIT_INSTDONE[%d][%d]: 0x%08x\n",
 473                                    slice, subslice,
 474                                    ee->instdone.geom_svg[slice][subslice]);
 475         }
 476
 477         err_printf(m, "  SC_INSTDONE_EXTRA: 0x%08x\n",
 478                    ee->instdone.slice_common_extra[0]);
 479         err_printf(m, "  SC_INSTDONE_EXTRA2: 0x%08x\n",
 480                    ee->instdone.slice_common_extra[1]);
 481 }
 482
 483 static void error_print_request(struct drm_i915_error_state_buf *m,
 484                                 const char *prefix,
 485                                 const struct i915_request_coredump *erq)
 486 {
 487         if (!erq->seqno)
 488                 return;
 489
 490         err_printf(m, "%s pid %d, seqno %8x:%08x%s%s, prio %d, head %08x, tail %08x\n",
 491                    prefix, erq->pid, erq->context, erq->seqno,
 492                    test_bit(DMA_FENCE_FLAG_SIGNALED_BIT,
 493                             &erq->flags) ? "!" : "",
 494                    test_bit(DMA_FENCE_FLAG_ENABLE_SIGNAL_BIT,
 495                             &erq->flags) ? "+" : "",
 496                    erq->sched_attr.priority,
 497                    erq->head, erq->tail);
 498 }
 499
 500 static void error_print_context(struct drm_i915_error_state_buf *m,
 501                                 const char *header,
 502                                 const struct i915_gem_context_coredump *ctx)
 503 {
 504         err_printf(m, "%s%s[%d] prio %d, guilty %d active %d, runtime total %lluns, avg %lluns\n",
 505                    header, ctx->comm, ctx->pid, ctx->sched_attr.priority,
 506                    ctx->guilty, ctx->active,
 507                    ctx->total_runtime, ctx->avg_runtime);
 508         err_printf(m, "  context timeline seqno %u\n", ctx->hwsp_seqno);
 509 }
 510
 511 static struct i915_vma_coredump *
 512 __find_vma(struct i915_vma_coredump *vma, const char *name)
 513 {
 514         while (vma) {
 515                 if (strcmp(vma->name, name) == 0)
 516                         return vma;
 517                 vma = vma->next;
 518         }
 519
 520         return NULL;
 521 }
 522
 523 struct i915_vma_coredump *
 524 intel_gpu_error_find_batch(const struct intel_engine_coredump *ee)
 525 {
 526         return __find_vma(ee->vma, "batch");
 527 }
 528
 529 static void error_print_engine(struct drm_i915_error_state_buf *m,
 530                                const struct intel_engine_coredump *ee)
 531 {
 532         struct i915_vma_coredump *batch;
 533         int n;
 534
 535         err_printf(m, "%s command stream:\n", ee->engine->name);
 536         err_printf(m, "  CCID:  0x%08x\n", ee->ccid);
 537         err_printf(m, "  START: 0x%08x\n", ee->start);
 538         err_printf(m, "  HEAD:  0x%08x [0x%08x]\n", ee->head, ee->rq_head);
 539         err_printf(m, "  TAIL:  0x%08x [0x%08x, 0x%08x]\n",
 540                    ee->tail, ee->rq_post, ee->rq_tail);
 541         err_printf(m, "  CTL:   0x%08x\n", ee->ctl);
 542         err_printf(m, "  MODE:  0x%08x\n", ee->mode);
 543         err_printf(m, "  HWS:   0x%08x\n", ee->hws);
 544         err_printf(m, "  ACTHD: 0x%08x %08x\n",
 545                    (u32)(ee->acthd>>32), (u32)ee->acthd);
 546         err_printf(m, "  IPEIR: 0x%08x\n", ee->ipeir);
 547         err_printf(m, "  IPEHR: 0x%08x\n", ee->ipehr);
 548         err_printf(m, "  ESR:   0x%08x\n", ee->esr);
 549
 550         error_print_instdone(m, ee);
 551
 552         batch = intel_gpu_error_find_batch(ee);
 553         if (batch) {
 554                 u64 start = batch->gtt_offset;
 555                 u64 end = start + batch->gtt_size;
 556
 557                 err_printf(m, "  batch: [0x%08x_%08x, 0x%08x_%08x]\n",
 558                            upper_32_bits(start), lower_32_bits(start),
 559                            upper_32_bits(end), lower_32_bits(end));
 560         }
 561         if (GRAPHICS_VER(m->i915) >= 4) {
 562                 err_printf(m, "  BBADDR: 0x%08x_%08x\n",
 563                            (u32)(ee->bbaddr>>32), (u32)ee->bbaddr);
 564                 err_printf(m, "  BB_STATE: 0x%08x\n", ee->bbstate);
 565                 err_printf(m, "  INSTPS: 0x%08x\n", ee->instps);
 566         }
 567         err_printf(m, "  INSTPM: 0x%08x\n", ee->instpm);
 568         err_printf(m, "  FADDR: 0x%08x %08x\n", upper_32_bits(ee->faddr),
 569                    lower_32_bits(ee->faddr));
 570         if (GRAPHICS_VER(m->i915) >= 6) {
 571                 err_printf(m, "  RC PSMI: 0x%08x\n", ee->rc_psmi);
 572                 err_printf(m, "  FAULT_REG: 0x%08x\n", ee->fault_reg);
 573         }
 574         if (GRAPHICS_VER(m->i915) >= 11) {
 575                 err_printf(m, "  NOPID: 0x%08x\n", ee->nopid);
 576                 err_printf(m, "  EXCC: 0x%08x\n", ee->excc);
 577                 err_printf(m, "  CMD_CCTL: 0x%08x\n", ee->cmd_cctl);
 578                 err_printf(m, "  CSCMDOP: 0x%08x\n", ee->cscmdop);
 579                 err_printf(m, "  CTX_SR_CTL: 0x%08x\n", ee->ctx_sr_ctl);
 580                 err_printf(m, "  DMA_FADDR_HI: 0x%08x\n", ee->dma_faddr_hi);
 581                 err_printf(m, "  DMA_FADDR_LO: 0x%08x\n", ee->dma_faddr_lo);
 582         }
 583         if (HAS_PPGTT(m->i915)) {
 584                 err_printf(m, "  GFX_MODE: 0x%08x\n", ee->vm_info.gfx_mode);
 585
 586                 if (GRAPHICS_VER(m->i915) >= 8) {
 587                         int i;
 588                         for (i = 0; i < 4; i++)
 589                                 err_printf(m, "  PDP%d: 0x%016llx\n",
 590                                            i, ee->vm_info.pdp[i]);
 591                 } else {
 592                         err_printf(m, "  PP_DIR_BASE: 0x%08x\n",
 593                                    ee->vm_info.pp_dir_base);
 594                 }
 595         }
 596
 597         for (n = 0; n < ee->num_ports; n++) {
 598                 err_printf(m, "  ELSP[%d]:", n);
 599                 error_print_request(m, " ", &ee->execlist[n]);
 600         }
 601 }
 602
 603 void i915_error_printf(struct drm_i915_error_state_buf *e, const char *f, ...)
 604 {
 605         va_list args;
 606
 607         va_start(args, f);
 608         i915_error_vprintf(e, f, args);
 609         va_end(args);
 610 }
 611
 612 void intel_gpu_error_print_vma(struct drm_i915_error_state_buf *m,
 613                                const struct intel_engine_cs *engine,
 614                                const struct i915_vma_coredump *vma)
 615 {
 616         char out[ASCII85_BUFSZ];
 617         struct page *page;
 618
 619         if (!vma)
 620                 return;
 621
 622         err_printf(m, "%s --- %s = 0x%08x %08x\n",
 623                    engine ? engine->name : "global", vma->name,
 624                    upper_32_bits(vma->gtt_offset),
 625                    lower_32_bits(vma->gtt_offset));
 626
 627         if (vma->gtt_page_sizes > I915_GTT_PAGE_SIZE_4K)
 628                 err_printf(m, "gtt_page_sizes = 0x%08x\n", vma->gtt_page_sizes);
 629
 630         err_compression_marker(m);
 631         list_for_each_entry(page, &vma->page_list, lru) {
 632                 int i, len;
 633                 const u32 *addr = page_address(page);
 634
 635                 len = PAGE_SIZE;
 636                 if (page == list_last_entry(&vma->page_list, typeof(*page), lru))
 637                         len -= vma->unused;
 638                 len = ascii85_encode_len(len);
 639
 640                 for (i = 0; i < len; i++)
 641                         err_puts(m, ascii85_encode(addr[i], out));
 642         }
 643         err_puts(m, "\n");
 644 }
 645
 646 static void err_print_capabilities(struct drm_i915_error_state_buf *m,
 647                                    struct i915_gpu_coredump *error)
 648 {
 649         struct drm_printer p = i915_error_printer(m);
 650
 651         intel_device_info_print(&error->device_info, &error->runtime_info, &p);
 652         intel_display_device_info_print(&error->display_device_info,
 653                                         &error->display_runtime_info, &p);
 654         intel_driver_caps_print(&error->driver_caps, &p);
 655 }
 656
 657 static void err_print_params(struct drm_i915_error_state_buf *m,
 658                              const struct i915_params *params)
 659 {
 660         struct drm_printer p = i915_error_printer(m);
 661
 662         i915_params_dump(params, &p);
 663 }
 664
 665 static void err_print_pciid(struct drm_i915_error_state_buf *m,
 666                             struct drm_i915_private *i915)
 667 {
 668         struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
 669
 670         err_printf(m, "PCI ID: 0x%04x\n", pdev->device);
 671         err_printf(m, "PCI Revision: 0x%02x\n", pdev->revision);
 672         err_printf(m, "PCI Subsystem: %04x:%04x\n",
 673                    pdev->subsystem_vendor,
 674                    pdev->subsystem_device);
 675 }
 676
 677 static void err_print_guc_ctb(struct drm_i915_error_state_buf *m,
 678                               const char *name,
 679                               const struct intel_ctb_coredump *ctb)
 680 {
 681         if (!ctb->size)
 682                 return;
 683
 684         err_printf(m, "GuC %s CTB: raw: 0x%08X, 0x%08X/%08X, cached: 0x%08X/%08X, desc = 0x%08X, buf = 0x%08X x 0x%08X\n",
 685                    name, ctb->raw_status, ctb->raw_head, ctb->raw_tail,
 686                    ctb->head, ctb->tail, ctb->desc_offset, ctb->cmds_offset, ctb->size);
 687 }
 688
 689 static void err_print_uc(struct drm_i915_error_state_buf *m,
 690                          const struct intel_uc_coredump *error_uc)
 691 {
 692         struct drm_printer p = i915_error_printer(m);
 693
 694         intel_uc_fw_dump(&error_uc->guc_fw, &p);
 695         intel_uc_fw_dump(&error_uc->huc_fw, &p);
 696         err_printf(m, "GuC timestamp: 0x%08x\n", error_uc->guc.timestamp);
 697         intel_gpu_error_print_vma(m, NULL, error_uc->guc.vma_log);
 698         err_printf(m, "GuC CTB fence: %d\n", error_uc->guc.last_fence);
 699         err_print_guc_ctb(m, "Send", error_uc->guc.ctb + 0);
 700         err_print_guc_ctb(m, "Recv", error_uc->guc.ctb + 1);
 701         intel_gpu_error_print_vma(m, NULL, error_uc->guc.vma_ctb);
 702 }
 703
 704 static void err_free_sgl(struct scatterlist *sgl)
 705 {
 706         while (sgl) {
 707                 struct scatterlist *sg;
 708
 709                 for (sg = sgl; !sg_is_chain(sg); sg++) {
 710                         kfree(sg_virt(sg));
 711                         if (sg_is_last(sg))
 712                                 break;
 713                 }
 714
 715                 sg = sg_is_last(sg) ? NULL : sg_chain_ptr(sg);
 716                 free_page((unsigned long)sgl);
 717                 sgl = sg;
 718         }
 719 }
 720
 721 static void err_print_gt_info(struct drm_i915_error_state_buf *m,
 722                               struct intel_gt_coredump *gt)
 723 {
 724         struct drm_printer p = i915_error_printer(m);
 725
 726         intel_gt_info_print(&gt->info, &p);
 727         intel_sseu_print_topology(gt->_gt->i915, &gt->info.sseu, &p);
 728 }
 729
 730 static void err_print_gt_display(struct drm_i915_error_state_buf *m,
 731                                  struct intel_gt_coredump *gt)
 732 {
 733         err_printf(m, "IER: 0x%08x\n", gt->ier);
 734         err_printf(m, "DERRMR: 0x%08x\n", gt->derrmr);
 735 }
 736
 737 static void err_print_gt_global_nonguc(struct drm_i915_error_state_buf *m,
 738                                        struct intel_gt_coredump *gt)
 739 {
 740         int i;
 741
 742         err_printf(m, "GT awake: %s\n", str_yes_no(gt->awake));
 743         err_printf(m, "CS timestamp frequency: %u Hz, %d ns\n",
 744                    gt->clock_frequency, gt->clock_period_ns);
 745         err_printf(m, "EIR: 0x%08x\n", gt->eir);
 746         err_printf(m, "PGTBL_ER: 0x%08x\n", gt->pgtbl_er);
 747
 748         for (i = 0; i < gt->ngtier; i++)
 749                 err_printf(m, "GTIER[%d]: 0x%08x\n", i, gt->gtier[i]);
 750 }
 751
 752 static void err_print_gt_global(struct drm_i915_error_state_buf *m,
 753                                 struct intel_gt_coredump *gt)
 754 {
 755         err_printf(m, "FORCEWAKE: 0x%08x\n", gt->forcewake);
 756
 757         if (IS_GRAPHICS_VER(m->i915, 6, 11)) {
 758                 err_printf(m, "ERROR: 0x%08x\n", gt->error);
 759                 err_printf(m, "DONE_REG: 0x%08x\n", gt->done_reg);
 760         }
 761
 762         if (GRAPHICS_VER(m->i915) >= 8)
 763                 err_printf(m, "FAULT_TLB_DATA: 0x%08x 0x%08x\n",
 764                            gt->fault_data1, gt->fault_data0);
 765
 766         if (GRAPHICS_VER(m->i915) == 7)
 767                 err_printf(m, "ERR_INT: 0x%08x\n", gt->err_int);
 768
 769         if (IS_GRAPHICS_VER(m->i915, 8, 11))
 770                 err_printf(m, "GTT_CACHE_EN: 0x%08x\n", gt->gtt_cache);
 771
 772         if (GRAPHICS_VER(m->i915) == 12)
 773                 err_printf(m, "AUX_ERR_DBG: 0x%08x\n", gt->aux_err);
 774
 775         if (GRAPHICS_VER(m->i915) >= 12) {
 776                 int i;
 777
 778                 for (i = 0; i < I915_MAX_SFC; i++) {
 779                         /*
 780                          * SFC_DONE resides in the VD forcewake domain, so it
 781                          * only exists if the corresponding VCS engine is
 782                          * present.
 783                          */
 784                         if ((gt->_gt->info.sfc_mask & BIT(i)) == 0 ||
 785                             !HAS_ENGINE(gt->_gt, _VCS(i * 2)))
 786                                 continue;
 787
 788                         err_printf(m, "  SFC_DONE[%d]: 0x%08x\n", i,
 789                                    gt->sfc_done[i]);
 790                 }
 791
 792                 err_printf(m, "  GAM_DONE: 0x%08x\n", gt->gam_done);
 793         }
 794 }
 795
 796 static void err_print_gt_fences(struct drm_i915_error_state_buf *m,
 797                                 struct intel_gt_coredump *gt)
 798 {
 799         int i;
 800
 801         for (i = 0; i < gt->nfence; i++)
 802                 err_printf(m, "  fence[%d] = %08llx\n", i, gt->fence[i]);
 803 }
 804
 805 static void err_print_gt_engines(struct drm_i915_error_state_buf *m,
 806                                  struct intel_gt_coredump *gt)
 807 {
 808         const struct intel_engine_coredump *ee;
 809
 810         for (ee = gt->engine; ee; ee = ee->next) {
 811                 const struct i915_vma_coredump *vma;
 812
 813                 if (gt->uc && gt->uc->guc.is_guc_capture) {
 814                         if (ee->guc_capture_node)
 815                                 intel_guc_capture_print_engine_node(m, ee);
 816                         else
 817                                 err_printf(m, "  Missing GuC capture node for %s\n",
 818                                            ee->engine->name);
 819                 } else {
 820                         error_print_engine(m, ee);
 821                 }
 822
 823                 err_printf(m, "  hung: %u\n", ee->hung);
 824                 err_printf(m, "  engine reset count: %u\n", ee->reset_count);
 825                 error_print_context(m, "  Active context: ", &ee->context);
 826
 827                 for (vma = ee->vma; vma; vma = vma->next)
 828                         intel_gpu_error_print_vma(m, ee->engine, vma);
 829         }
 830
 831 }
 832
 833 static void __err_print_to_sgl(struct drm_i915_error_state_buf *m,
 834                                struct i915_gpu_coredump *error)
 835 {
 836         const struct intel_engine_coredump *ee;
 837         struct timespec64 ts;
 838
 839         if (*error->error_msg)
 840                 err_printf(m, "%s\n", error->error_msg);
 841         err_printf(m, "Kernel: %s %s\n",
 842                    init_utsname()->release,
 843                    init_utsname()->machine);
 844         err_printf(m, "Driver: %s\n", DRIVER_DATE);
 845         ts = ktime_to_timespec64(error->time);
 846         err_printf(m, "Time: %lld s %ld us\n",
 847                    (s64)ts.tv_sec, ts.tv_nsec / NSEC_PER_USEC);
 848         ts = ktime_to_timespec64(error->boottime);
 849         err_printf(m, "Boottime: %lld s %ld us\n",
 850                    (s64)ts.tv_sec, ts.tv_nsec / NSEC_PER_USEC);
 851         ts = ktime_to_timespec64(error->uptime);
 852         err_printf(m, "Uptime: %lld s %ld us\n",
 853                    (s64)ts.tv_sec, ts.tv_nsec / NSEC_PER_USEC);
 854         err_printf(m, "Capture: %lu jiffies; %d ms ago\n",
 855                    error->capture, jiffies_to_msecs(jiffies - error->capture));
 856
 857         for (ee = error->gt ? error->gt->engine : NULL; ee; ee = ee->next)
 858                 err_printf(m, "Active process (on ring %s): %s [%d]\n",
 859                            ee->engine->name,
 860                            ee->context.comm,
 861                            ee->context.pid);
 862
 863         err_printf(m, "Reset count: %u\n", error->reset_count);
 864         err_printf(m, "Suspend count: %u\n", error->suspend_count);
 865         err_printf(m, "Platform: %s\n", intel_platform_name(error->device_info.platform));
 866         err_printf(m, "Subplatform: 0x%x\n",
 867                    intel_subplatform(&error->runtime_info,
 868                                      error->device_info.platform));
 869         err_print_pciid(m, m->i915);
 870
 871         err_printf(m, "IOMMU enabled?: %d\n", error->iommu);
 872
 873         intel_dmc_print_error_state(m, m->i915);
 874
 875         err_printf(m, "RPM wakelock: %s\n", str_yes_no(error->wakelock));
 876         err_printf(m, "PM suspended: %s\n", str_yes_no(error->suspended));
 877
 878         if (error->gt) {
 879                 bool print_guc_capture = false;
 880
 881                 if (error->gt->uc && error->gt->uc->guc.is_guc_capture)
 882                         print_guc_capture = true;
 883
 884                 err_print_gt_display(m, error->gt);
 885                 err_print_gt_global_nonguc(m, error->gt);
 886                 err_print_gt_fences(m, error->gt);
 887
 888                 /*
 889                  * GuC dumped global, eng-class and eng-instance registers together
 890                  * as part of engine state dump so we print in err_print_gt_engines
 891                  */
 892                 if (!print_guc_capture)
 893                         err_print_gt_global(m, error->gt);
 894
 895                 err_print_gt_engines(m, error->gt);
 896
 897                 if (error->gt->uc)
 898                         err_print_uc(m, error->gt->uc);
 899
 900                 err_print_gt_info(m, error->gt);
 901         }
 902
 903         if (error->overlay)
 904                 intel_overlay_print_error_state(m, error->overlay);
 905
 906         err_print_capabilities(m, error);
 907         err_print_params(m, &error->params);
 908 }
 909
 910 static int err_print_to_sgl(struct i915_gpu_coredump *error)
 911 {
 912         struct drm_i915_error_state_buf m;
 913
 914         if (IS_ERR(error))
 915                 return PTR_ERR(error);
 916
 917         if (READ_ONCE(error->sgl))
 918                 return 0;
 919
 920         memset(&m, 0, sizeof(m));
 921         m.i915 = error->i915;
 922
 923         __err_print_to_sgl(&m, error);
 924
 925         if (m.buf) {
 926                 __sg_set_buf(m.cur++, m.buf, m.bytes, m.iter);
 927                 m.bytes = 0;
 928                 m.buf = NULL;
 929         }
 930         if (m.cur) {
 931                 GEM_BUG_ON(m.end < m.cur);
 932                 sg_mark_end(m.cur - 1);
 933         }
 934         GEM_BUG_ON(m.sgl && !m.cur);
 935
 936         if (m.err) {
 937                 err_free_sgl(m.sgl);
 938                 return m.err;
 939         }
 940
 941         if (cmpxchg(&error->sgl, NULL, m.sgl))
 942                 err_free_sgl(m.sgl);
 943
 944         return 0;
 945 }
 946
 947 ssize_t i915_gpu_coredump_copy_to_buffer(struct i915_gpu_coredump *error,
 948                                          char *buf, loff_t off, size_t rem)
 949 {
 950         struct scatterlist *sg;
 951         size_t count;
 952         loff_t pos;
 953         int err;
 954
 955         if (!error || !rem)
 956                 return 0;
 957
 958         err = err_print_to_sgl(error);
 959         if (err)
 960                 return err;
 961
 962         sg = READ_ONCE(error->fit);
 963         if (!sg || off < sg->dma_address)
 964                 sg = error->sgl;
 965         if (!sg)
 966                 return 0;
 967
 968         pos = sg->dma_address;
 969         count = 0;
 970         do {
 971                 size_t len, start;
 972
 973                 if (sg_is_chain(sg)) {
 974                         sg = sg_chain_ptr(sg);
 975                         GEM_BUG_ON(sg_is_chain(sg));
 976                 }
 977
 978                 len = sg->length;
 979                 if (pos + len <= off) {
 980                         pos += len;
 981                         continue;
 982                 }
 983
 984                 start = sg->offset;
 985                 if (pos < off) {
 986                         GEM_BUG_ON(off - pos > len);
 987                         len -= off - pos;
 988                         start += off - pos;
 989                         pos = off;
 990                 }
 991
 992                 len = min(len, rem);
 993                 GEM_BUG_ON(!len || len > sg->length);
 994
 995                 memcpy(buf, page_address(sg_page(sg)) + start, len);
 996
 997                 count += len;
 998                 pos += len;
 999
1000                 buf += len;
1001                 rem -= len;
1002                 if (!rem) {
1003                         WRITE_ONCE(error->fit, sg);
1004                         break;
1005                 }
1006         } while (!sg_is_last(sg++));
1007
1008         return count;
1009 }
1010
1011 static void i915_vma_coredump_free(struct i915_vma_coredump *vma)
1012 {
1013         while (vma) {
1014                 struct i915_vma_coredump *next = vma->next;
1015                 struct page *page, *n;
1016
1017                 list_for_each_entry_safe(page, n, &vma->page_list, lru) {
1018                         list_del_init(&page->lru);
1019                         __free_page(page);
1020                 }
1021
1022                 kfree(vma);
1023                 vma = next;
1024         }
1025 }
1026
1027 static void cleanup_params(struct i915_gpu_coredump *error)
1028 {
1029         i915_params_free(&error->params);
1030 }
1031
1032 static void cleanup_uc(struct intel_uc_coredump *uc)
1033 {
1034         kfree(uc->guc_fw.file_selected.path);
1035         kfree(uc->huc_fw.file_selected.path);
1036         kfree(uc->guc_fw.file_wanted.path);
1037         kfree(uc->huc_fw.file_wanted.path);
1038         i915_vma_coredump_free(uc->guc.vma_log);
1039         i915_vma_coredump_free(uc->guc.vma_ctb);
1040
1041         kfree(uc);
1042 }
1043
1044 static void cleanup_gt(struct intel_gt_coredump *gt)
1045 {
1046         while (gt->engine) {
1047                 struct intel_engine_coredump *ee = gt->engine;
1048
1049                 gt->engine = ee->next;
1050
1051                 i915_vma_coredump_free(ee->vma);
1052                 intel_guc_capture_free_node(ee);
1053                 kfree(ee);
1054         }
1055
1056         if (gt->uc)
1057                 cleanup_uc(gt->uc);
1058
1059         kfree(gt);
1060 }
1061
1062 void __i915_gpu_coredump_free(struct kref *error_ref)
1063 {
1064         struct i915_gpu_coredump *error =
1065                 container_of(error_ref, typeof(*error), ref);
1066
1067         while (error->gt) {
1068                 struct intel_gt_coredump *gt = error->gt;
1069
1070                 error->gt = gt->next;
1071                 cleanup_gt(gt);
1072         }
1073
1074         kfree(error->overlay);
1075
1076         cleanup_params(error);
1077
1078         err_free_sgl(error->sgl);
1079         kfree(error);
1080 }
1081
1082 static struct i915_vma_coredump *
1083 i915_vma_coredump_create(const struct intel_gt *gt,
1084                          const struct i915_vma_resource *vma_res,
1085                          struct i915_vma_compress *compress,
1086                          const char *name)
1087
1088 {
1089         struct i915_ggtt *ggtt = gt->ggtt;
1090         const u64 slot = ggtt->error_capture.start;
1091         struct i915_vma_coredump *dst;
1092         struct sgt_iter iter;
1093         int ret;
1094
1095         might_sleep();
1096
1097         if (!vma_res || !vma_res->bi.pages || !compress)
1098                 return NULL;
1099
1100         dst = kmalloc(sizeof(*dst), ALLOW_FAIL);
1101         if (!dst)
1102                 return NULL;
1103
1104         if (!compress_start(compress)) {
1105                 kfree(dst);
1106                 return NULL;
1107         }
1108
1109         INIT_LIST_HEAD(&dst->page_list);
1110         strcpy(dst->name, name);
1111         dst->next = NULL;
1112
1113         dst->gtt_offset = vma_res->start;
1114         dst->gtt_size = vma_res->node_size;
1115         dst->gtt_page_sizes = vma_res->page_sizes_gtt;
1116         dst->unused = 0;
1117
1118         ret = -EINVAL;
1119         if (drm_mm_node_allocated(&ggtt->error_capture)) {
1120                 void __iomem *s;
1121                 dma_addr_t dma;
1122
1123                 for_each_sgt_daddr(dma, iter, vma_res->bi.pages) {
1124                         mutex_lock(&ggtt->error_mutex);
1125                         if (ggtt->vm.raw_insert_page)
1126                                 ggtt->vm.raw_insert_page(&ggtt->vm, dma, slot,
1127                                                          i915_gem_get_pat_index(gt->i915,
1128                                                                                 I915_CACHE_NONE),
1129                                                          0);
1130                         else
1131                                 ggtt->vm.insert_page(&ggtt->vm, dma, slot,
1132                                                      i915_gem_get_pat_index(gt->i915,
1133                                                                             I915_CACHE_NONE),
1134                                                      0);
1135                         mb();
1136
1137                         s = io_mapping_map_wc(&ggtt->iomap, slot, PAGE_SIZE);
1138                         ret = compress_page(compress,
1139                                             (void  __force *)s, dst,
1140                                             true);
1141                         io_mapping_unmap(s);
1142
1143                         mb();
1144                         ggtt->vm.clear_range(&ggtt->vm, slot, PAGE_SIZE);
1145                         mutex_unlock(&ggtt->error_mutex);
1146                         if (ret)
1147                                 break;
1148                 }
1149         } else if (vma_res->bi.lmem) {
1150                 struct intel_memory_region *mem = vma_res->mr;
1151                 dma_addr_t dma;
1152
1153                 for_each_sgt_daddr(dma, iter, vma_res->bi.pages) {
1154                         dma_addr_t offset = dma - mem->region.start;
1155                         void __iomem *s;
1156
1157                         if (offset + PAGE_SIZE > mem->io_size) {
1158                                 ret = -EINVAL;
1159                                 break;
1160                         }
1161
1162                         s = io_mapping_map_wc(&mem->iomap, offset, PAGE_SIZE);
1163                         ret = compress_page(compress,
1164                                             (void __force *)s, dst,
1165                                             true);
1166                         io_mapping_unmap(s);
1167                         if (ret)
1168                                 break;
1169                 }
1170         } else {
1171                 struct page *page;
1172
1173                 for_each_sgt_page(page, iter, vma_res->bi.pages) {
1174                         void *s;
1175
1176                         drm_clflush_pages(&page, 1);
1177
1178                         s = kmap_local_page(page);
1179                         ret = compress_page(compress, s, dst, false);
1180                         kunmap_local(s);
1181
1182                         drm_clflush_pages(&page, 1);
1183
1184                         if (ret)
1185                                 break;
1186                 }
1187         }
1188
1189         if (ret || compress_flush(compress, dst)) {
1190                 struct page *page, *n;
1191
1192                 list_for_each_entry_safe_reverse(page, n, &dst->page_list, lru) {
1193                         list_del_init(&page->lru);
1194                         pool_free(&compress->pool, page_address(page));
1195                 }
1196
1197                 kfree(dst);
1198                 dst = NULL;
1199         }
1200         compress_finish(compress);
1201
1202         return dst;
1203 }
1204
1205 static void gt_record_fences(struct intel_gt_coredump *gt)
1206 {
1207         struct i915_ggtt *ggtt = gt->_gt->ggtt;
1208         struct intel_uncore *uncore = gt->_gt->uncore;
1209         int i;
1210
1211         if (GRAPHICS_VER(uncore->i915) >= 6) {
1212                 for (i = 0; i < ggtt->num_fences; i++)
1213                         gt->fence[i] =
1214                                 intel_uncore_read64(uncore,
1215                                                     FENCE_REG_GEN6_LO(i));
1216         } else if (GRAPHICS_VER(uncore->i915) >= 4) {
1217                 for (i = 0; i < ggtt->num_fences; i++)
1218                         gt->fence[i] =
1219                                 intel_uncore_read64(uncore,
1220                                                     FENCE_REG_965_LO(i));
1221         } else {
1222                 for (i = 0; i < ggtt->num_fences; i++)
1223                         gt->fence[i] =
1224                                 intel_uncore_read(uncore, FENCE_REG(i));
1225         }
1226         gt->nfence = i;
1227 }
1228
1229 static void engine_record_registers(struct intel_engine_coredump *ee)
1230 {
1231         const struct intel_engine_cs *engine = ee->engine;
1232         struct drm_i915_private *i915 = engine->i915;
1233
1234         if (GRAPHICS_VER(i915) >= 6) {
1235                 ee->rc_psmi = ENGINE_READ(engine, RING_PSMI_CTL);
1236
1237                 if (GRAPHICS_VER_FULL(i915) >= IP_VER(12, 50))
1238                         ee->fault_reg = intel_gt_mcr_read_any(engine->gt,
1239                                                               XEHP_RING_FAULT_REG);
1240                 else if (GRAPHICS_VER(i915) >= 12)
1241                         ee->fault_reg = intel_uncore_read(engine->uncore,
1242                                                           GEN12_RING_FAULT_REG);
1243                 else if (GRAPHICS_VER(i915) >= 8)
1244                         ee->fault_reg = intel_uncore_read(engine->uncore,
1245                                                           GEN8_RING_FAULT_REG);
1246                 else
1247                         ee->fault_reg = GEN6_RING_FAULT_REG_READ(engine);
1248         }
1249
1250         if (GRAPHICS_VER(i915) >= 4) {
1251                 ee->esr = ENGINE_READ(engine, RING_ESR);
1252                 ee->faddr = ENGINE_READ(engine, RING_DMA_FADD);
1253                 ee->ipeir = ENGINE_READ(engine, RING_IPEIR);
1254                 ee->ipehr = ENGINE_READ(engine, RING_IPEHR);
1255                 ee->instps = ENGINE_READ(engine, RING_INSTPS);
1256                 ee->bbaddr = ENGINE_READ(engine, RING_BBADDR);
1257                 ee->ccid = ENGINE_READ(engine, CCID);
1258                 if (GRAPHICS_VER(i915) >= 8) {
1259                         ee->faddr |= (u64)ENGINE_READ(engine, RING_DMA_FADD_UDW) << 32;
1260                         ee->bbaddr |= (u64)ENGINE_READ(engine, RING_BBADDR_UDW) << 32;
1261                 }
1262                 ee->bbstate = ENGINE_READ(engine, RING_BBSTATE);
1263         } else {
1264                 ee->faddr = ENGINE_READ(engine, DMA_FADD_I8XX);
1265                 ee->ipeir = ENGINE_READ(engine, IPEIR);
1266                 ee->ipehr = ENGINE_READ(engine, IPEHR);
1267         }
1268
1269         if (GRAPHICS_VER(i915) >= 11) {
1270                 ee->cmd_cctl = ENGINE_READ(engine, RING_CMD_CCTL);
1271                 ee->cscmdop = ENGINE_READ(engine, RING_CSCMDOP);
1272                 ee->ctx_sr_ctl = ENGINE_READ(engine, RING_CTX_SR_CTL);
1273                 ee->dma_faddr_hi = ENGINE_READ(engine, RING_DMA_FADD_UDW);
1274                 ee->dma_faddr_lo = ENGINE_READ(engine, RING_DMA_FADD);
1275                 ee->nopid = ENGINE_READ(engine, RING_NOPID);
1276                 ee->excc = ENGINE_READ(engine, RING_EXCC);
1277         }
1278
1279         intel_engine_get_instdone(engine, &ee->instdone);
1280
1281         ee->instpm = ENGINE_READ(engine, RING_INSTPM);
1282         ee->acthd = intel_engine_get_active_head(engine);
1283         ee->start = ENGINE_READ(engine, RING_START);
1284         ee->head = ENGINE_READ(engine, RING_HEAD);
1285         ee->tail = ENGINE_READ(engine, RING_TAIL);
1286         ee->ctl = ENGINE_READ(engine, RING_CTL);
1287         if (GRAPHICS_VER(i915) > 2)
1288                 ee->mode = ENGINE_READ(engine, RING_MI_MODE);
1289
1290         if (!HWS_NEEDS_PHYSICAL(i915)) {
1291                 i915_reg_t mmio;
1292
1293                 if (GRAPHICS_VER(i915) == 7) {
1294                         switch (engine->id) {
1295                         default:
1296                                 MISSING_CASE(engine->id);
1297                                 fallthrough;
1298                         case RCS0:
1299                                 mmio = RENDER_HWS_PGA_GEN7;
1300                                 break;
1301                         case BCS0:
1302                                 mmio = BLT_HWS_PGA_GEN7;
1303                                 break;
1304                         case VCS0:
1305                                 mmio = BSD_HWS_PGA_GEN7;
1306                                 break;
1307                         case VECS0:
1308                                 mmio = VEBOX_HWS_PGA_GEN7;
1309                                 break;
1310                         }
1311                 } else if (GRAPHICS_VER(engine->i915) == 6) {
1312                         mmio = RING_HWS_PGA_GEN6(engine->mmio_base);
1313                 } else {
1314                         /* XXX: gen8 returns to sanity */
1315                         mmio = RING_HWS_PGA(engine->mmio_base);
1316                 }
1317
1318                 ee->hws = intel_uncore_read(engine->uncore, mmio);
1319         }
1320
1321         ee->reset_count = i915_reset_engine_count(&i915->gpu_error, engine);
1322
1323         if (HAS_PPGTT(i915)) {
1324                 int i;
1325
1326                 ee->vm_info.gfx_mode = ENGINE_READ(engine, RING_MODE_GEN7);
1327
1328                 if (GRAPHICS_VER(i915) == 6) {
1329                         ee->vm_info.pp_dir_base =
1330                                 ENGINE_READ(engine, RING_PP_DIR_BASE_READ);
1331                 } else if (GRAPHICS_VER(i915) == 7) {
1332                         ee->vm_info.pp_dir_base =
1333                                 ENGINE_READ(engine, RING_PP_DIR_BASE);
1334                 } else if (GRAPHICS_VER(i915) >= 8) {
1335                         u32 base = engine->mmio_base;
1336
1337                         for (i = 0; i < 4; i++) {
1338                                 ee->vm_info.pdp[i] =
1339                                         intel_uncore_read(engine->uncore,
1340                                                           GEN8_RING_PDP_UDW(base, i));
1341                                 ee->vm_info.pdp[i] <<= 32;
1342                                 ee->vm_info.pdp[i] |=
1343                                         intel_uncore_read(engine->uncore,
1344                                                           GEN8_RING_PDP_LDW(base, i));
1345                         }
1346                 }
1347         }
1348 }
1349
1350 static void record_request(const struct i915_request *request,
1351                            struct i915_request_coredump *erq)
1352 {
1353         erq->flags = request->fence.flags;
1354         erq->context = request->fence.context;
1355         erq->seqno = request->fence.seqno;
1356         erq->sched_attr = request->sched.attr;
1357         erq->head = request->head;
1358         erq->tail = request->tail;
1359
1360         erq->pid = 0;
1361         rcu_read_lock();
1362         if (!intel_context_is_closed(request->context)) {
1363                 const struct i915_gem_context *ctx;
1364
1365                 ctx = rcu_dereference(request->context->gem_context);
1366                 if (ctx)
1367                         erq->pid = pid_nr(ctx->pid);
1368         }
1369         rcu_read_unlock();
1370 }
1371
1372 static void engine_record_execlists(struct intel_engine_coredump *ee)
1373 {
1374         const struct intel_engine_execlists * const el = &ee->engine->execlists;
1375         struct i915_request * const *port = el->active;
1376         unsigned int n = 0;
1377
1378         while (*port)
1379                 record_request(*port++, &ee->execlist[n++]);
1380
1381         ee->num_ports = n;
1382 }
1383
1384 static bool record_context(struct i915_gem_context_coredump *e,
1385                            struct intel_context *ce)
1386 {
1387         struct i915_gem_context *ctx;
1388         struct task_struct *task;
1389         bool simulated;
1390
1391         rcu_read_lock();
1392         ctx = rcu_dereference(ce->gem_context);
1393         if (ctx && !kref_get_unless_zero(&ctx->ref))
1394                 ctx = NULL;
1395         rcu_read_unlock();
1396         if (!ctx)
1397                 return true;
1398
1399         rcu_read_lock();
1400         task = pid_task(ctx->pid, PIDTYPE_PID);
1401         if (task) {
1402                 strcpy(e->comm, task->comm);
1403                 e->pid = task->pid;
1404         }
1405         rcu_read_unlock();
1406
1407         e->sched_attr = ctx->sched;
1408         e->guilty = atomic_read(&ctx->guilty_count);
1409         e->active = atomic_read(&ctx->active_count);
1410         e->hwsp_seqno = (ce->timeline && ce->timeline->hwsp_seqno) ?
1411                                 *ce->timeline->hwsp_seqno : ~0U;
1412
1413         e->total_runtime = intel_context_get_total_runtime_ns(ce);
1414         e->avg_runtime = intel_context_get_avg_runtime_ns(ce);
1415
1416         simulated = i915_gem_context_no_error_capture(ctx);
1417
1418         i915_gem_context_put(ctx);
1419         return simulated;
1420 }
1421
1422 struct intel_engine_capture_vma {
1423         struct intel_engine_capture_vma *next;
1424         struct i915_vma_resource *vma_res;
1425         char name[16];
1426         bool lockdep_cookie;
1427 };
1428
1429 static struct intel_engine_capture_vma *
1430 capture_vma_snapshot(struct intel_engine_capture_vma *next,
1431                      struct i915_vma_resource *vma_res,
1432                      gfp_t gfp, const char *name)
1433 {
1434         struct intel_engine_capture_vma *c;
1435
1436         if (!vma_res)
1437                 return next;
1438
1439         c = kmalloc(sizeof(*c), gfp);
1440         if (!c)
1441                 return next;
1442
1443         if (!i915_vma_resource_hold(vma_res, &c->lockdep_cookie)) {
1444                 kfree(c);
1445                 return next;
1446         }
1447
1448         strcpy(c->name, name);
1449         c->vma_res = i915_vma_resource_get(vma_res);
1450
1451         c->next = next;
1452         return c;
1453 }
1454
1455 static struct intel_engine_capture_vma *
1456 capture_vma(struct intel_engine_capture_vma *next,
1457             struct i915_vma *vma,
1458             const char *name,
1459             gfp_t gfp)
1460 {
1461         if (!vma)
1462                 return next;
1463
1464         /*
1465          * If the vma isn't pinned, then the vma should be snapshotted
1466          * to a struct i915_vma_snapshot at command submission time.
1467          * Not here.
1468          */
1469         if (GEM_WARN_ON(!i915_vma_is_pinned(vma)))
1470                 return next;
1471
1472         next = capture_vma_snapshot(next, vma->resource, gfp, name);
1473
1474         return next;
1475 }
1476
1477 static struct intel_engine_capture_vma *
1478 capture_user(struct intel_engine_capture_vma *capture,
1479              const struct i915_request *rq,
1480              gfp_t gfp)
1481 {
1482         struct i915_capture_list *c;
1483
1484         for (c = rq->capture_list; c; c = c->next)
1485                 capture = capture_vma_snapshot(capture, c->vma_res, gfp,
1486                                                "user");
1487
1488         return capture;
1489 }
1490
1491 static void add_vma(struct intel_engine_coredump *ee,
1492                     struct i915_vma_coredump *vma)
1493 {
1494         if (vma) {
1495                 vma->next = ee->vma;
1496                 ee->vma = vma;
1497         }
1498 }
1499
1500 static struct i915_vma_coredump *
1501 create_vma_coredump(const struct intel_gt *gt, struct i915_vma *vma,
1502                     const char *name, struct i915_vma_compress *compress)
1503 {
1504         struct i915_vma_coredump *ret = NULL;
1505         struct i915_vma_resource *vma_res;
1506         bool lockdep_cookie;
1507
1508         if (!vma)
1509                 return NULL;
1510
1511         vma_res = vma->resource;
1512
1513         if (i915_vma_resource_hold(vma_res, &lockdep_cookie)) {
1514                 ret = i915_vma_coredump_create(gt, vma_res, compress, name);
1515                 i915_vma_resource_unhold(vma_res, lockdep_cookie);
1516         }
1517
1518         return ret;
1519 }
1520
1521 static void add_vma_coredump(struct intel_engine_coredump *ee,
1522                              const struct intel_gt *gt,
1523                              struct i915_vma *vma,
1524                              const char *name,
1525                              struct i915_vma_compress *compress)
1526 {
1527         add_vma(ee, create_vma_coredump(gt, vma, name, compress));
1528 }
1529
1530 struct intel_engine_coredump *
1531 intel_engine_coredump_alloc(struct intel_engine_cs *engine, gfp_t gfp, u32 dump_flags)
1532 {
1533         struct intel_engine_coredump *ee;
1534
1535         ee = kzalloc(sizeof(*ee), gfp);
1536         if (!ee)
1537                 return NULL;
1538
1539         ee->engine = engine;
1540
1541         if (!(dump_flags & CORE_DUMP_FLAG_IS_GUC_CAPTURE)) {
1542                 engine_record_registers(ee);
1543                 engine_record_execlists(ee);
1544         }
1545
1546         return ee;
1547 }
1548
1549 static struct intel_engine_capture_vma *
1550 engine_coredump_add_context(struct intel_engine_coredump *ee,
1551                             struct intel_context *ce,
1552                             gfp_t gfp)
1553 {
1554         struct intel_engine_capture_vma *vma = NULL;
1555
1556         ee->simulated |= record_context(&ee->context, ce);
1557         if (ee->simulated)
1558                 return NULL;
1559
1560         /*
1561          * We need to copy these to an anonymous buffer
1562          * as the simplest method to avoid being overwritten
1563          * by userspace.
1564          */
1565         vma = capture_vma(vma, ce->ring->vma, "ring", gfp);
1566         vma = capture_vma(vma, ce->state, "HW context", gfp);
1567
1568         return vma;
1569 }
1570
1571 struct intel_engine_capture_vma *
1572 intel_engine_coredump_add_request(struct intel_engine_coredump *ee,
1573                                   struct i915_request *rq,
1574                                   gfp_t gfp)
1575 {
1576         struct intel_engine_capture_vma *vma;
1577
1578         vma = engine_coredump_add_context(ee, rq->context, gfp);
1579         if (!vma)
1580                 return NULL;
1581
1582         /*
1583          * We need to copy these to an anonymous buffer
1584          * as the simplest method to avoid being overwritten
1585          * by userspace.
1586          */
1587         vma = capture_vma_snapshot(vma, rq->batch_res, gfp, "batch");
1588         vma = capture_user(vma, rq, gfp);
1589
1590         ee->rq_head = rq->head;
1591         ee->rq_post = rq->postfix;
1592         ee->rq_tail = rq->tail;
1593
1594         return vma;
1595 }
1596
1597 void
1598 intel_engine_coredump_add_vma(struct intel_engine_coredump *ee,
1599                               struct intel_engine_capture_vma *capture,
1600                               struct i915_vma_compress *compress)
1601 {
1602         const struct intel_engine_cs *engine = ee->engine;
1603
1604         while (capture) {
1605                 struct intel_engine_capture_vma *this = capture;
1606                 struct i915_vma_resource *vma_res = this->vma_res;
1607
1608                 add_vma(ee,
1609                         i915_vma_coredump_create(engine->gt, vma_res,
1610                                                  compress, this->name));
1611
1612                 i915_vma_resource_unhold(vma_res, this->lockdep_cookie);
1613                 i915_vma_resource_put(vma_res);
1614
1615                 capture = this->next;
1616                 kfree(this);
1617         }
1618
1619         add_vma_coredump(ee, engine->gt, engine->status_page.vma,
1620                          "HW Status", compress);
1621
1622         add_vma_coredump(ee, engine->gt, engine->wa_ctx.vma,
1623                          "WA context", compress);
1624 }
1625
1626 static struct intel_engine_coredump *
1627 capture_engine(struct intel_engine_cs *engine,
1628                struct i915_vma_compress *compress,
1629                u32 dump_flags)
1630 {
1631         struct intel_engine_capture_vma *capture = NULL;
1632         struct intel_engine_coredump *ee;
1633         struct intel_context *ce = NULL;
1634         struct i915_request *rq = NULL;
1635
1636         ee = intel_engine_coredump_alloc(engine, ALLOW_FAIL, dump_flags);
1637         if (!ee)
1638                 return NULL;
1639
1640         intel_engine_get_hung_entity(engine, &ce, &rq);
1641         if (rq && !i915_request_started(rq))
1642                 drm_info(&engine->gt->i915->drm, "Got hung context on %s with active request %lld:%lld [0x%04X] not yet started\n",
1643                          engine->name, rq->fence.context, rq->fence.seqno, ce->guc_id.id);
1644
1645         if (rq) {
1646                 capture = intel_engine_coredump_add_request(ee, rq, ATOMIC_MAYFAIL);
1647                 i915_request_put(rq);
1648         } else if (ce) {
1649                 capture = engine_coredump_add_context(ee, ce, ATOMIC_MAYFAIL);
1650         }
1651
1652         if (capture) {
1653                 intel_engine_coredump_add_vma(ee, capture, compress);
1654
1655                 if (dump_flags & CORE_DUMP_FLAG_IS_GUC_CAPTURE)
1656                         intel_guc_capture_get_matching_node(engine->gt, ee, ce);
1657         } else {
1658                 kfree(ee);
1659                 ee = NULL;
1660         }
1661
1662         return ee;
1663 }
1664
1665 static void
1666 gt_record_engines(struct intel_gt_coredump *gt,
1667                   intel_engine_mask_t engine_mask,
1668                   struct i915_vma_compress *compress,
1669                   u32 dump_flags)
1670 {
1671         struct intel_engine_cs *engine;
1672         enum intel_engine_id id;
1673
1674         for_each_engine(engine, gt->_gt, id) {
1675                 struct intel_engine_coredump *ee;
1676
1677                 /* Refill our page pool before entering atomic section */
1678                 pool_refill(&compress->pool, ALLOW_FAIL);
1679
1680                 ee = capture_engine(engine, compress, dump_flags);
1681                 if (!ee)
1682                         continue;
1683
1684                 ee->hung = engine->mask & engine_mask;
1685
1686                 gt->simulated |= ee->simulated;
1687                 if (ee->simulated) {
1688                         if (dump_flags & CORE_DUMP_FLAG_IS_GUC_CAPTURE)
1689                                 intel_guc_capture_free_node(ee);
1690                         kfree(ee);
1691                         continue;
1692                 }
1693
1694                 ee->next = gt->engine;
1695                 gt->engine = ee;
1696         }
1697 }
1698
1699 static void gt_record_guc_ctb(struct intel_ctb_coredump *saved,
1700                               const struct intel_guc_ct_buffer *ctb,
1701                               const void *blob_ptr, struct intel_guc *guc)
1702 {
1703         if (!ctb || !ctb->desc)
1704                 return;
1705
1706         saved->raw_status = ctb->desc->status;
1707         saved->raw_head = ctb->desc->head;
1708         saved->raw_tail = ctb->desc->tail;
1709         saved->head = ctb->head;
1710         saved->tail = ctb->tail;
1711         saved->size = ctb->size;
1712         saved->desc_offset = ((void *)ctb->desc) - blob_ptr;
1713         saved->cmds_offset = ((void *)ctb->cmds) - blob_ptr;
1714 }
1715
1716 static struct intel_uc_coredump *
1717 gt_record_uc(struct intel_gt_coredump *gt,
1718              struct i915_vma_compress *compress)
1719 {
1720         const struct intel_uc *uc = &gt->_gt->uc;
1721         struct intel_uc_coredump *error_uc;
1722
1723         error_uc = kzalloc(sizeof(*error_uc), ALLOW_FAIL);
1724         if (!error_uc)
1725                 return NULL;
1726
1727         memcpy(&error_uc->guc_fw, &uc->guc.fw, sizeof(uc->guc.fw));
1728         memcpy(&error_uc->huc_fw, &uc->huc.fw, sizeof(uc->huc.fw));
1729
1730         error_uc->guc_fw.file_selected.path = kstrdup(uc->guc.fw.file_selected.path, ALLOW_FAIL);
1731         error_uc->huc_fw.file_selected.path = kstrdup(uc->huc.fw.file_selected.path, ALLOW_FAIL);
1732         error_uc->guc_fw.file_wanted.path = kstrdup(uc->guc.fw.file_wanted.path, ALLOW_FAIL);
1733         error_uc->huc_fw.file_wanted.path = kstrdup(uc->huc.fw.file_wanted.path, ALLOW_FAIL);
1734
1735         /*
1736          * Save the GuC log and include a timestamp reference for converting the
1737          * log times to system times (in conjunction with the error->boottime and
1738          * gt->clock_frequency fields saved elsewhere).
1739          */
1740         error_uc->guc.timestamp = intel_uncore_read(gt->_gt->uncore, GUCPMTIMESTAMP);
1741         error_uc->guc.vma_log = create_vma_coredump(gt->_gt, uc->guc.log.vma,
1742                                                     "GuC log buffer", compress);
1743         error_uc->guc.vma_ctb = create_vma_coredump(gt->_gt, uc->guc.ct.vma,
1744                                                     "GuC CT buffer", compress);
1745         error_uc->guc.last_fence = uc->guc.ct.requests.last_fence;
1746         gt_record_guc_ctb(error_uc->guc.ctb + 0, &uc->guc.ct.ctbs.send,
1747                           uc->guc.ct.ctbs.send.desc, (struct intel_guc *)&uc->guc);
1748         gt_record_guc_ctb(error_uc->guc.ctb + 1, &uc->guc.ct.ctbs.recv,
1749                           uc->guc.ct.ctbs.send.desc, (struct intel_guc *)&uc->guc);
1750
1751         return error_uc;
1752 }
1753
1754 /* Capture display registers. */
1755 static void gt_record_display_regs(struct intel_gt_coredump *gt)
1756 {
1757         struct intel_uncore *uncore = gt->_gt->uncore;
1758         struct drm_i915_private *i915 = uncore->i915;
1759
1760         if (GRAPHICS_VER(i915) >= 6)
1761                 gt->derrmr = intel_uncore_read(uncore, DERRMR);
1762
1763         if (GRAPHICS_VER(i915) >= 8)
1764                 gt->ier = intel_uncore_read(uncore, GEN8_DE_MISC_IER);
1765         else if (IS_VALLEYVIEW(i915))
1766                 gt->ier = intel_uncore_read(uncore, VLV_IER);
1767         else if (HAS_PCH_SPLIT(i915))
1768                 gt->ier = intel_uncore_read(uncore, DEIER);
1769         else if (GRAPHICS_VER(i915) == 2)
1770                 gt->ier = intel_uncore_read16(uncore, GEN2_IER);
1771         else
1772                 gt->ier = intel_uncore_read(uncore, GEN2_IER);
1773 }
1774
1775 /* Capture all other registers that GuC doesn't capture. */
1776 static void gt_record_global_nonguc_regs(struct intel_gt_coredump *gt)
1777 {
1778         struct intel_uncore *uncore = gt->_gt->uncore;
1779         struct drm_i915_private *i915 = uncore->i915;
1780         int i;
1781
1782         if (IS_VALLEYVIEW(i915)) {
1783                 gt->gtier[0] = intel_uncore_read(uncore, GTIER);
1784                 gt->ngtier = 1;
1785         } else if (GRAPHICS_VER(i915) >= 11) {
1786                 gt->gtier[0] =
1787                         intel_uncore_read(uncore,
1788                                           GEN11_RENDER_COPY_INTR_ENABLE);
1789                 gt->gtier[1] =
1790                         intel_uncore_read(uncore, GEN11_VCS_VECS_INTR_ENABLE);
1791                 gt->gtier[2] =
1792                         intel_uncore_read(uncore, GEN11_GUC_SG_INTR_ENABLE);
1793                 gt->gtier[3] =
1794                         intel_uncore_read(uncore,
1795                                           GEN11_GPM_WGBOXPERF_INTR_ENABLE);
1796                 gt->gtier[4] =
1797                         intel_uncore_read(uncore,
1798                                           GEN11_CRYPTO_RSVD_INTR_ENABLE);
1799                 gt->gtier[5] =
1800                         intel_uncore_read(uncore,
1801                                           GEN11_GUNIT_CSME_INTR_ENABLE);
1802                 gt->ngtier = 6;
1803         } else if (GRAPHICS_VER(i915) >= 8) {
1804                 for (i = 0; i < 4; i++)
1805                         gt->gtier[i] =
1806                                 intel_uncore_read(uncore, GEN8_GT_IER(i));
1807                 gt->ngtier = 4;
1808         } else if (HAS_PCH_SPLIT(i915)) {
1809                 gt->gtier[0] = intel_uncore_read(uncore, GTIER);
1810                 gt->ngtier = 1;
1811         }
1812
1813         gt->eir = intel_uncore_read(uncore, EIR);
1814         gt->pgtbl_er = intel_uncore_read(uncore, PGTBL_ER);
1815 }
1816
1817 /*
1818  * Capture all registers that relate to workload submission.
1819  * NOTE: In GuC submission, when GuC resets an engine, it can dump these for us
1820  */
1821 static void gt_record_global_regs(struct intel_gt_coredump *gt)
1822 {
1823         struct intel_uncore *uncore = gt->_gt->uncore;
1824         struct drm_i915_private *i915 = uncore->i915;
1825         int i;
1826
1827         /*
1828          * General organization
1829          * 1. Registers specific to a single generation
1830          * 2. Registers which belong to multiple generations
1831          * 3. Feature specific registers.
1832          * 4. Everything else
1833          * Please try to follow the order.
1834          */
1835
1836         /* 1: Registers specific to a single generation */
1837         if (IS_VALLEYVIEW(i915))
1838                 gt->forcewake = intel_uncore_read_fw(uncore, FORCEWAKE_VLV);
1839
1840         if (GRAPHICS_VER(i915) == 7)
1841                 gt->err_int = intel_uncore_read(uncore, GEN7_ERR_INT);
1842
1843         if (GRAPHICS_VER_FULL(i915) >= IP_VER(12, 50)) {
1844                 gt->fault_data0 = intel_gt_mcr_read_any((struct intel_gt *)gt->_gt,
1845                                                         XEHP_FAULT_TLB_DATA0);
1846                 gt->fault_data1 = intel_gt_mcr_read_any((struct intel_gt *)gt->_gt,
1847                                                         XEHP_FAULT_TLB_DATA1);
1848         } else if (GRAPHICS_VER(i915) >= 12) {
1849                 gt->fault_data0 = intel_uncore_read(uncore,
1850                                                     GEN12_FAULT_TLB_DATA0);
1851                 gt->fault_data1 = intel_uncore_read(uncore,
1852                                                     GEN12_FAULT_TLB_DATA1);
1853         } else if (GRAPHICS_VER(i915) >= 8) {
1854                 gt->fault_data0 = intel_uncore_read(uncore,
1855                                                     GEN8_FAULT_TLB_DATA0);
1856                 gt->fault_data1 = intel_uncore_read(uncore,
1857                                                     GEN8_FAULT_TLB_DATA1);
1858         }
1859
1860         if (GRAPHICS_VER(i915) == 6) {
1861                 gt->forcewake = intel_uncore_read_fw(uncore, FORCEWAKE);
1862                 gt->gab_ctl = intel_uncore_read(uncore, GAB_CTL);
1863                 gt->gfx_mode = intel_uncore_read(uncore, GFX_MODE);
1864         }
1865
1866         /* 2: Registers which belong to multiple generations */
1867         if (GRAPHICS_VER(i915) >= 7)
1868                 gt->forcewake = intel_uncore_read_fw(uncore, FORCEWAKE_MT);
1869
1870         if (GRAPHICS_VER(i915) >= 6) {
1871                 if (GRAPHICS_VER(i915) < 12) {
1872                         gt->error = intel_uncore_read(uncore, ERROR_GEN6);
1873                         gt->done_reg = intel_uncore_read(uncore, DONE_REG);
1874                 }
1875         }
1876
1877         /* 3: Feature specific registers */
1878         if (IS_GRAPHICS_VER(i915, 6, 7)) {
1879                 gt->gam_ecochk = intel_uncore_read(uncore, GAM_ECOCHK);
1880                 gt->gac_eco = intel_uncore_read(uncore, GAC_ECO_BITS);
1881         }
1882
1883         if (IS_GRAPHICS_VER(i915, 8, 11))
1884                 gt->gtt_cache = intel_uncore_read(uncore, HSW_GTT_CACHE_EN);
1885
1886         if (GRAPHICS_VER(i915) == 12)
1887                 gt->aux_err = intel_uncore_read(uncore, GEN12_AUX_ERR_DBG);
1888
1889         if (GRAPHICS_VER(i915) >= 12) {
1890                 for (i = 0; i < I915_MAX_SFC; i++) {
1891                         /*
1892                          * SFC_DONE resides in the VD forcewake domain, so it
1893                          * only exists if the corresponding VCS engine is
1894                          * present.
1895                          */
1896                         if ((gt->_gt->info.sfc_mask & BIT(i)) == 0 ||
1897                             !HAS_ENGINE(gt->_gt, _VCS(i * 2)))
1898                                 continue;
1899
1900                         gt->sfc_done[i] =
1901                                 intel_uncore_read(uncore, GEN12_SFC_DONE(i));
1902                 }
1903
1904                 gt->gam_done = intel_uncore_read(uncore, GEN12_GAM_DONE);
1905         }
1906 }
1907
1908 static void gt_record_info(struct intel_gt_coredump *gt)
1909 {
1910         memcpy(&gt->info, &gt->_gt->info, sizeof(struct intel_gt_info));
1911         gt->clock_frequency = gt->_gt->clock_frequency;
1912         gt->clock_period_ns = gt->_gt->clock_period_ns;
1913 }
1914
1915 /*
1916  * Generate a semi-unique error code. The code is not meant to have meaning, The
1917  * code's only purpose is to try to prevent false duplicated bug reports by
1918  * grossly estimating a GPU error state.
1919  *
1920  * TODO Ideally, hashing the batchbuffer would be a very nice way to determine
1921  * the hang if we could strip the GTT offset information from it.
1922  *
1923  * It's only a small step better than a random number in its current form.
1924  */
1925 static u32 generate_ecode(const struct intel_engine_coredump *ee)
1926 {
1927         /*
1928          * IPEHR would be an ideal way to detect errors, as it's the gross
1929          * measure of "the command that hung." However, has some very common
1930          * synchronization commands which almost always appear in the case
1931          * strictly a client bug. Use instdone to differentiate those some.
1932          */
1933         return ee ? ee->ipehr ^ ee->instdone.instdone : 0;
1934 }
1935
1936 static const char *error_msg(struct i915_gpu_coredump *error)
1937 {
1938         struct intel_engine_coredump *first = NULL;
1939         unsigned int hung_classes = 0;
1940         struct intel_gt_coredump *gt;
1941         int len;
1942
1943         for (gt = error->gt; gt; gt = gt->next) {
1944                 struct intel_engine_coredump *cs;
1945
1946                 for (cs = gt->engine; cs; cs = cs->next) {
1947                         if (cs->hung) {
1948                                 hung_classes |= BIT(cs->engine->uabi_class);
1949                                 if (!first)
1950                                         first = cs;
1951                         }
1952                 }
1953         }
1954
1955         len = scnprintf(error->error_msg, sizeof(error->error_msg),
1956                         "GPU HANG: ecode %d:%x:%08x",
1957                         GRAPHICS_VER(error->i915), hung_classes,
1958                         generate_ecode(first));
1959         if (first && first->context.pid) {
1960                 /* Just show the first executing process, more is confusing */
1961                 len += scnprintf(error->error_msg + len,
1962                                  sizeof(error->error_msg) - len,
1963                                  ", in %s [%d]",
1964                                  first->context.comm, first->context.pid);
1965         }
1966
1967         return error->error_msg;
1968 }
1969
1970 static void capture_gen(struct i915_gpu_coredump *error)
1971 {
1972         struct drm_i915_private *i915 = error->i915;
1973
1974         error->wakelock = atomic_read(&i915->runtime_pm.wakeref_count);
1975         error->suspended = i915->runtime_pm.suspended;
1976
1977         error->iommu = i915_vtd_active(i915);
1978         error->reset_count = i915_reset_count(&i915->gpu_error);
1979         error->suspend_count = i915->suspend_count;
1980
1981         i915_params_copy(&error->params, &i915->params);
1982         memcpy(&error->device_info,
1983                INTEL_INFO(i915),
1984                sizeof(error->device_info));
1985         memcpy(&error->runtime_info,
1986                RUNTIME_INFO(i915),
1987                sizeof(error->runtime_info));
1988         memcpy(&error->display_device_info, DISPLAY_INFO(i915),
1989                sizeof(error->display_device_info));
1990         memcpy(&error->display_runtime_info, DISPLAY_RUNTIME_INFO(i915),
1991                sizeof(error->display_runtime_info));
1992         error->driver_caps = i915->caps;
1993 }
1994
1995 struct i915_gpu_coredump *
1996 i915_gpu_coredump_alloc(struct drm_i915_private *i915, gfp_t gfp)
1997 {
1998         struct i915_gpu_coredump *error;
1999
2000         if (!i915->params.error_capture)
2001                 return NULL;
2002
2003         error = kzalloc(sizeof(*error), gfp);
2004         if (!error)
2005                 return NULL;
2006
2007         kref_init(&error->ref);
2008         error->i915 = i915;
2009
2010         error->time = ktime_get_real();
2011         error->boottime = ktime_get_boottime();
2012         error->uptime = ktime_sub(ktime_get(), to_gt(i915)->last_init_time);
2013         error->capture = jiffies;
2014
2015         capture_gen(error);
2016
2017         return error;
2018 }
2019
2020 #define DAY_AS_SECONDS(x) (24 * 60 * 60 * (x))
2021
2022 struct intel_gt_coredump *
2023 intel_gt_coredump_alloc(struct intel_gt *gt, gfp_t gfp, u32 dump_flags)
2024 {
2025         struct intel_gt_coredump *gc;
2026
2027         gc = kzalloc(sizeof(*gc), gfp);
2028         if (!gc)
2029                 return NULL;
2030
2031         gc->_gt = gt;
2032         gc->awake = intel_gt_pm_is_awake(gt);
2033
2034         gt_record_display_regs(gc);
2035         gt_record_global_nonguc_regs(gc);
2036
2037         /*
2038          * GuC dumps global, eng-class and eng-instance registers
2039          * (that can change as part of engine state during execution)
2040          * before an engine is reset due to a hung context.
2041          * GuC captures and reports all three groups of registers
2042          * together as a single set before the engine is reset.
2043          * Thus, if GuC triggered the context reset we retrieve
2044          * the register values as part of gt_record_engines.
2045          */
2046         if (!(dump_flags & CORE_DUMP_FLAG_IS_GUC_CAPTURE))
2047                 gt_record_global_regs(gc);
2048
2049         gt_record_fences(gc);
2050
2051         return gc;
2052 }
2053
2054 struct i915_vma_compress *
2055 i915_vma_capture_prepare(struct intel_gt_coredump *gt)
2056 {
2057         struct i915_vma_compress *compress;
2058
2059         compress = kmalloc(sizeof(*compress), ALLOW_FAIL);
2060         if (!compress)
2061                 return NULL;
2062
2063         if (!compress_init(compress)) {
2064                 kfree(compress);
2065                 return NULL;
2066         }
2067
2068         return compress;
2069 }
2070
2071 void i915_vma_capture_finish(struct intel_gt_coredump *gt,
2072                              struct i915_vma_compress *compress)
2073 {
2074         if (!compress)
2075                 return;
2076
2077         compress_fini(compress);
2078         kfree(compress);
2079 }
2080
2081 static struct i915_gpu_coredump *
2082 __i915_gpu_coredump(struct intel_gt *gt, intel_engine_mask_t engine_mask, u32 dump_flags)
2083 {
2084         struct drm_i915_private *i915 = gt->i915;
2085         struct i915_gpu_coredump *error;
2086
2087         /* Check if GPU capture has been disabled */
2088         error = READ_ONCE(i915->gpu_error.first_error);
2089         if (IS_ERR(error))
2090                 return error;
2091
2092         error = i915_gpu_coredump_alloc(i915, ALLOW_FAIL);
2093         if (!error)
2094                 return ERR_PTR(-ENOMEM);
2095
2096         error->gt = intel_gt_coredump_alloc(gt, ALLOW_FAIL, dump_flags);
2097         if (error->gt) {
2098                 struct i915_vma_compress *compress;
2099
2100                 compress = i915_vma_capture_prepare(error->gt);
2101                 if (!compress) {
2102                         kfree(error->gt);
2103                         kfree(error);
2104                         return ERR_PTR(-ENOMEM);
2105                 }
2106
2107                 if (INTEL_INFO(i915)->has_gt_uc) {
2108                         error->gt->uc = gt_record_uc(error->gt, compress);
2109                         if (error->gt->uc) {
2110                                 if (dump_flags & CORE_DUMP_FLAG_IS_GUC_CAPTURE)
2111                                         error->gt->uc->guc.is_guc_capture = true;
2112                                 else
2113                                         GEM_BUG_ON(error->gt->uc->guc.is_guc_capture);
2114                         }
2115                 }
2116
2117                 gt_record_info(error->gt);
2118                 gt_record_engines(error->gt, engine_mask, compress, dump_flags);
2119
2120
2121                 i915_vma_capture_finish(error->gt, compress);
2122
2123                 error->simulated |= error->gt->simulated;
2124         }
2125
2126         error->overlay = intel_overlay_capture_error_state(i915);
2127
2128         return error;
2129 }
2130
2131 struct i915_gpu_coredump *
2132 i915_gpu_coredump(struct intel_gt *gt, intel_engine_mask_t engine_mask, u32 dump_flags)
2133 {
2134         static DEFINE_MUTEX(capture_mutex);
2135         int ret = mutex_lock_interruptible(&capture_mutex);
2136         struct i915_gpu_coredump *dump;
2137
2138         if (ret)
2139                 return ERR_PTR(ret);
2140
2141         dump = __i915_gpu_coredump(gt, engine_mask, dump_flags);
2142         mutex_unlock(&capture_mutex);
2143
2144         return dump;
2145 }
2146
2147 void i915_error_state_store(struct i915_gpu_coredump *error)
2148 {
2149         struct drm_i915_private *i915;
2150         static bool warned;
2151
2152         if (IS_ERR_OR_NULL(error))
2153                 return;
2154
2155         i915 = error->i915;
2156         drm_info(&i915->drm, "%s\n", error_msg(error));
2157
2158         if (error->simulated ||
2159             cmpxchg(&i915->gpu_error.first_error, NULL, error))
2160                 return;
2161
2162         i915_gpu_coredump_get(error);
2163
2164         if (!xchg(&warned, true) &&
2165             ktime_get_real_seconds() - DRIVER_TIMESTAMP < DAY_AS_SECONDS(180)) {
2166                 pr_info("GPU hangs can indicate a bug anywhere in the entire gfx stack, including userspace.\n");
2167                 pr_info("Please file a _new_ bug report at https://gitlab.freedesktop.org/drm/intel/issues/new.\n");
2168                 pr_info("Please see https://gitlab.freedesktop.org/drm/intel/-/wikis/How-to-file-i915-bugs for details.\n");
2169                 pr_info("drm/i915 developers can then reassign to the right component if it's not a kernel issue.\n");
2170                 pr_info("The GPU crash dump is required to analyze GPU hangs, so please always attach it.\n");
2171                 pr_info("GPU crash dump saved to /sys/class/drm/card%d/error\n",
2172                         i915->drm.primary->index);
2173         }
2174 }
2175
2176 /**
2177  * i915_capture_error_state - capture an error record for later analysis
2178  * @gt: intel_gt which originated the hang
2179  * @engine_mask: hung engines
2180  * @dump_flags: dump flags
2181  *
2182  * Should be called when an error is detected (either a hang or an error
2183  * interrupt) to capture error state from the time of the error.  Fills
2184  * out a structure which becomes available in debugfs for user level tools
2185  * to pick up.
2186  */
2187 void i915_capture_error_state(struct intel_gt *gt,
2188                               intel_engine_mask_t engine_mask, u32 dump_flags)
2189 {
2190         struct i915_gpu_coredump *error;
2191
2192         error = i915_gpu_coredump(gt, engine_mask, dump_flags);
2193         if (IS_ERR(error)) {
2194                 cmpxchg(&gt->i915->gpu_error.first_error, NULL, error);
2195                 return;
2196         }
2197
2198         i915_error_state_store(error);
2199         i915_gpu_coredump_put(error);
2200 }
2201
2202 struct i915_gpu_coredump *
2203 i915_first_error_state(struct drm_i915_private *i915)
2204 {
2205         struct i915_gpu_coredump *error;
2206
2207         spin_lock_irq(&i915->gpu_error.lock);
2208         error = i915->gpu_error.first_error;
2209         if (!IS_ERR_OR_NULL(error))
2210                 i915_gpu_coredump_get(error);
2211         spin_unlock_irq(&i915->gpu_error.lock);
2212
2213         return error;
2214 }
2215
2216 void i915_reset_error_state(struct drm_i915_private *i915)
2217 {
2218         struct i915_gpu_coredump *error;
2219
2220         spin_lock_irq(&i915->gpu_error.lock);
2221         error = i915->gpu_error.first_error;
2222         if (error != ERR_PTR(-ENODEV)) /* if disabled, always disabled */
2223                 i915->gpu_error.first_error = NULL;
2224         spin_unlock_irq(&i915->gpu_error.lock);
2225
2226         if (!IS_ERR_OR_NULL(error))
2227                 i915_gpu_coredump_put(error);
2228 }
2229
2230 void i915_disable_error_state(struct drm_i915_private *i915, int err)
2231 {
2232         spin_lock_irq(&i915->gpu_error.lock);
2233         if (!i915->gpu_error.first_error)
2234                 i915->gpu_error.first_error = ERR_PTR(err);
2235         spin_unlock_irq(&i915->gpu_error.lock);
2236 }
2237
2238 #if IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM)
2239 void intel_klog_error_capture(struct intel_gt *gt,
2240                               intel_engine_mask_t engine_mask)
2241 {
2242         static int g_count;
2243         struct drm_i915_private *i915 = gt->i915;
2244         struct i915_gpu_coredump *error;
2245         intel_wakeref_t wakeref;
2246         size_t buf_size = PAGE_SIZE * 128;
2247         size_t pos_err;
2248         char *buf, *ptr, *next;
2249         int l_count = g_count++;
2250         int line = 0;
2251
2252         /* Can't allocate memory during a reset */
2253         if (test_bit(I915_RESET_BACKOFF, &gt->reset.flags)) {
2254                 drm_err(&gt->i915->drm, "[Capture/%d.%d] Inside GT reset, skipping error capture :(\n",
2255                         l_count, line++);
2256                 return;
2257         }
2258
2259         error = READ_ONCE(i915->gpu_error.first_error);
2260         if (error) {
2261                 drm_err(&i915->drm, "[Capture/%d.%d] Clearing existing error capture first...\n",
2262                         l_count, line++);
2263                 i915_reset_error_state(i915);
2264         }
2265
2266         with_intel_runtime_pm(&i915->runtime_pm, wakeref)
2267                 error = i915_gpu_coredump(gt, engine_mask, CORE_DUMP_FLAG_NONE);
2268
2269         if (IS_ERR(error)) {
2270                 drm_err(&i915->drm, "[Capture/%d.%d] Failed to capture error capture: %ld!\n",
2271                         l_count, line++, PTR_ERR(error));
2272                 return;
2273         }
2274
2275         buf = kvmalloc(buf_size, GFP_KERNEL);
2276         if (!buf) {
2277                 drm_err(&i915->drm, "[Capture/%d.%d] Failed to allocate buffer for error capture!\n",
2278                         l_count, line++);
2279                 i915_gpu_coredump_put(error);
2280                 return;
2281         }
2282
2283         drm_info(&i915->drm, "[Capture/%d.%d] Dumping i915 error capture for %ps...\n",
2284                  l_count, line++, __builtin_return_address(0));
2285
2286         /* Largest string length safe to print via dmesg */
2287 #       define MAX_CHUNK        800
2288
2289         pos_err = 0;
2290         while (1) {
2291                 ssize_t got = i915_gpu_coredump_copy_to_buffer(error, buf, pos_err, buf_size - 1);
2292
2293                 if (got <= 0)
2294                         break;
2295
2296                 buf[got] = 0;
2297                 pos_err += got;
2298
2299                 ptr = buf;
2300                 while (got > 0) {
2301                         size_t count;
2302                         char tag[2];
2303
2304                         next = strnchr(ptr, got, '\n');
2305                         if (next) {
2306                                 count = next - ptr;
2307                                 *next = 0;
2308                                 tag[0] = '>';
2309                                 tag[1] = '<';
2310                         } else {
2311                                 count = got;
2312                                 tag[0] = '}';
2313                                 tag[1] = '{';
2314                         }
2315
2316                         if (count > MAX_CHUNK) {
2317                                 size_t pos;
2318                                 char *ptr2 = ptr;
2319
2320                                 for (pos = MAX_CHUNK; pos < count; pos += MAX_CHUNK) {
2321                                         char chr = ptr[pos];
2322
2323                                         ptr[pos] = 0;
2324                                         drm_info(&i915->drm, "[Capture/%d.%d] }%s{\n",
2325                                                  l_count, line++, ptr2);
2326                                         ptr[pos] = chr;
2327                                         ptr2 = ptr + pos;
2328
2329                                         /*
2330                                          * If spewing large amounts of data via a serial console,
2331                                          * this can be a very slow process. So be friendly and try
2332                                          * not to cause 'softlockup on CPU' problems.
2333                                          */
2334                                         cond_resched();
2335                                 }
2336
2337                                 if (ptr2 < (ptr + count))
2338                                         drm_info(&i915->drm, "[Capture/%d.%d] %c%s%c\n",
2339                                                  l_count, line++, tag[0], ptr2, tag[1]);
2340                                 else if (tag[0] == '>')
2341                                         drm_info(&i915->drm, "[Capture/%d.%d] ><\n",
2342                                                  l_count, line++);
2343                         } else {
2344                                 drm_info(&i915->drm, "[Capture/%d.%d] %c%s%c\n",
2345                                          l_count, line++, tag[0], ptr, tag[1]);
2346                         }
2347
2348                         ptr = next;
2349                         got -= count;
2350                         if (next) {
2351                                 ptr++;
2352                                 got--;
2353                         }
2354
2355                         /* As above. */
2356                         cond_resched();
2357                 }
2358
2359                 if (got)
2360                         drm_info(&i915->drm, "[Capture/%d.%d] Got %zd bytes remaining!\n",
2361                                  l_count, line++, got);
2362         }
2363
2364         kvfree(buf);
2365
2366         drm_info(&i915->drm, "[Capture/%d.%d] Dumped %zd bytes\n", l_count, line++, pos_err);
2367 }
2368 #endif