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/debugfs.h>
  32#include <linux/highmem.h>
  33#include <linux/nmi.h>
  34#include <linux/pagevec.h>
  35#include <linux/scatterlist.h>
  36#include <linux/string_helpers.h>
  37#include <linux/utsname.h>
  38#include <linux/zlib.h>
  39
  40#include <drm/drm_cache.h>
  41#include <drm/drm_print.h>
  42
  43#include "display/intel_display_snapshot.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_sysfs.h"
  61#include "i915_utils.h"
  62
  63#define ALLOW_FAIL (__GFP_KSWAPD_RECLAIM | __GFP_RETRY_MAYFAIL | __GFP_NOWARN)
  64#define ATOMIC_MAYFAIL (GFP_ATOMIC | __GFP_NOWARN)
 
 
 
  65
  66static void __sg_set_buf(struct scatterlist *sg,
  67			 void *addr, unsigned int len, loff_t it)
  68{
  69	sg->page_link = (unsigned long)virt_to_page(addr);
  70	sg->offset = offset_in_page(addr);
  71	sg->length = len;
  72	sg->dma_address = it;
  73}
  74
  75static bool __i915_error_grow(struct drm_i915_error_state_buf *e, size_t len)
  76{
  77	if (!len)
  78		return false;
 
 
 
 
 
  79
  80	if (e->bytes + len + 1 <= e->size)
  81		return true;
 
 
  82
  83	if (e->bytes) {
  84		__sg_set_buf(e->cur++, e->buf, e->bytes, e->iter);
  85		e->iter += e->bytes;
  86		e->buf = NULL;
  87		e->bytes = 0;
  88	}
  89
  90	if (e->cur == e->end) {
  91		struct scatterlist *sgl;
  92
  93		sgl = (typeof(sgl))__get_free_page(ALLOW_FAIL);
  94		if (!sgl) {
  95			e->err = -ENOMEM;
  96			return false;
  97		}
  98
  99		if (e->cur) {
 100			e->cur->offset = 0;
 101			e->cur->length = 0;
 102			e->cur->page_link =
 103				(unsigned long)sgl | SG_CHAIN;
 104		} else {
 105			e->sgl = sgl;
 106		}
 107
 108		e->cur = sgl;
 109		e->end = sgl + SG_MAX_SINGLE_ALLOC - 1;
 
 110	}
 111
 112	e->size = ALIGN(len + 1, SZ_64K);
 113	e->buf = kmalloc(e->size, ALLOW_FAIL);
 114	if (!e->buf) {
 115		e->size = PAGE_ALIGN(len + 1);
 116		e->buf = kmalloc(e->size, GFP_KERNEL);
 
 
 
 
 
 
 
 117	}
 118	if (!e->buf) {
 119		e->err = -ENOMEM;
 
 
 120		return false;
 121	}
 122
 123	return true;
 124}
 125
 126__printf(2, 0)
 127static void i915_error_vprintf(struct drm_i915_error_state_buf *e,
 128			       const char *fmt, va_list args)
 129{
 130	va_list ap;
 131	int len;
 
 132
 133	if (e->err)
 134		return;
 
 
 
 
 
 
 135
 136	va_copy(ap, args);
 137	len = vsnprintf(NULL, 0, fmt, ap);
 138	va_end(ap);
 139	if (len <= 0) {
 140		e->err = len;
 141		return;
 142	}
 143
 144	if (!__i915_error_grow(e, len))
 145		return;
 
 146
 147	GEM_BUG_ON(e->bytes >= e->size);
 148	len = vscnprintf(e->buf + e->bytes, e->size - e->bytes, fmt, args);
 149	if (len < 0) {
 150		e->err = len;
 
 
 
 151		return;
 
 
 
 
 
 
 
 
 
 
 
 152	}
 153	e->bytes += len;
 
 
 
 
 
 154}
 155
 156static void i915_error_puts(struct drm_i915_error_state_buf *e, const char *str)
 
 157{
 158	unsigned len;
 159
 160	if (e->err || !str)
 161		return;
 162
 163	len = strlen(str);
 164	if (!__i915_error_grow(e, len))
 165		return;
 166
 167	GEM_BUG_ON(e->bytes + len > e->size);
 
 
 
 
 
 
 
 168	memcpy(e->buf + e->bytes, str, len);
 169	e->bytes += len;
 
 170}
 171
 172#define err_printf(e, ...) i915_error_printf(e, __VA_ARGS__)
 173#define err_puts(e, s) i915_error_puts(e, s)
 174
 175static void __i915_printfn_error(struct drm_printer *p, struct va_format *vaf)
 176{
 177	i915_error_vprintf(p->arg, vaf->fmt, *vaf->va);
 178}
 179
 180static inline struct drm_printer
 181i915_error_printer(struct drm_i915_error_state_buf *e)
 182{
 183	struct drm_printer p = {
 184		.printfn = __i915_printfn_error,
 185		.arg = e,
 186	};
 187	return p;
 188}
 189
 190/* single threaded page allocator with a reserved stash for emergencies */
 191static void pool_fini(struct folio_batch *fbatch)
 192{
 193	folio_batch_release(fbatch);
 194}
 195
 196static int pool_refill(struct folio_batch *fbatch, gfp_t gfp)
 197{
 198	while (folio_batch_space(fbatch)) {
 199		struct folio *folio;
 200
 201		folio = folio_alloc(gfp, 0);
 202		if (!folio)
 203			return -ENOMEM;
 204
 205		folio_batch_add(fbatch, folio);
 206	}
 207
 208	return 0;
 209}
 210
 211static int pool_init(struct folio_batch *fbatch, gfp_t gfp)
 212{
 213	int err;
 214
 215	folio_batch_init(fbatch);
 216
 217	err = pool_refill(fbatch, gfp);
 218	if (err)
 219		pool_fini(fbatch);
 220
 221	return err;
 222}
 223
 224static void *pool_alloc(struct folio_batch *fbatch, gfp_t gfp)
 225{
 226	struct folio *folio;
 227
 228	folio = folio_alloc(gfp, 0);
 229	if (!folio && folio_batch_count(fbatch))
 230		folio = fbatch->folios[--fbatch->nr];
 231
 232	return folio ? folio_address(folio) : NULL;
 233}
 234
 235static void pool_free(struct folio_batch *fbatch, void *addr)
 236{
 237	struct folio *folio = virt_to_folio(addr);
 238
 239	if (folio_batch_space(fbatch))
 240		folio_batch_add(fbatch, folio);
 241	else
 242		folio_put(folio);
 243}
 244
 245#ifdef CONFIG_DRM_I915_COMPRESS_ERROR
 246
 247struct i915_vma_compress {
 248	struct folio_batch pool;
 249	struct z_stream_s zstream;
 250	void *tmp;
 251};
 252
 253static bool compress_init(struct i915_vma_compress *c)
 254{
 255	struct z_stream_s *zstream = &c->zstream;
 256
 257	if (pool_init(&c->pool, ALLOW_FAIL))
 258		return false;
 259
 260	zstream->workspace =
 261		kmalloc(zlib_deflate_workspacesize(MAX_WBITS, MAX_MEM_LEVEL),
 262			ALLOW_FAIL);
 263	if (!zstream->workspace) {
 264		pool_fini(&c->pool);
 
 
 
 265		return false;
 266	}
 267
 268	c->tmp = NULL;
 269	if (i915_has_memcpy_from_wc())
 270		c->tmp = pool_alloc(&c->pool, ALLOW_FAIL);
 271
 272	return true;
 273}
 274
 275static bool compress_start(struct i915_vma_compress *c)
 276{
 277	struct z_stream_s *zstream = &c->zstream;
 278	void *workspace = zstream->workspace;
 279
 280	memset(zstream, 0, sizeof(*zstream));
 281	zstream->workspace = workspace;
 282
 283	return zlib_deflateInit(zstream, Z_DEFAULT_COMPRESSION) == Z_OK;
 284}
 285
 286static void *compress_next_page(struct i915_vma_compress *c,
 287				struct i915_vma_coredump *dst)
 288{
 289	void *page_addr;
 290	struct page *page;
 291
 292	page_addr = pool_alloc(&c->pool, ALLOW_FAIL);
 293	if (!page_addr)
 294		return ERR_PTR(-ENOMEM);
 295
 296	page = virt_to_page(page_addr);
 297	list_add_tail(&page->lru, &dst->page_list);
 298	return page_addr;
 299}
 300
 301static int compress_page(struct i915_vma_compress *c,
 302			 void *src,
 303			 struct i915_vma_coredump *dst,
 304			 bool wc)
 305{
 306	struct z_stream_s *zstream = &c->zstream;
 307
 308	zstream->next_in = src;
 309	if (wc && c->tmp && i915_memcpy_from_wc(c->tmp, src, PAGE_SIZE))
 310		zstream->next_in = c->tmp;
 311	zstream->avail_in = PAGE_SIZE;
 312
 313	do {
 314		if (zstream->avail_out == 0) {
 315			zstream->next_out = compress_next_page(c, dst);
 316			if (IS_ERR(zstream->next_out))
 317				return PTR_ERR(zstream->next_out);
 
 
 318
 
 
 
 319			zstream->avail_out = PAGE_SIZE;
 320		}
 321
 322		if (zlib_deflate(zstream, Z_NO_FLUSH) != Z_OK)
 323			return -EIO;
 324
 325		cond_resched();
 326	} while (zstream->avail_in);
 327
 328	/* Fallback to uncompressed if we increase size? */
 329	if (0 && zstream->total_out > zstream->total_in)
 330		return -E2BIG;
 331
 332	return 0;
 333}
 334
 335static int compress_flush(struct i915_vma_compress *c,
 336			  struct i915_vma_coredump *dst)
 337{
 338	struct z_stream_s *zstream = &c->zstream;
 339
 340	do {
 341		switch (zlib_deflate(zstream, Z_FINISH)) {
 342		case Z_OK: /* more space requested */
 343			zstream->next_out = compress_next_page(c, dst);
 344			if (IS_ERR(zstream->next_out))
 345				return PTR_ERR(zstream->next_out);
 346
 347			zstream->avail_out = PAGE_SIZE;
 348			break;
 349
 350		case Z_STREAM_END:
 351			goto end;
 352
 353		default: /* any error */
 354			return -EIO;
 355		}
 356	} while (1);
 357
 358end:
 359	memset(zstream->next_out, 0, zstream->avail_out);
 360	dst->unused = zstream->avail_out;
 361	return 0;
 362}
 363
 364static void compress_finish(struct i915_vma_compress *c)
 365{
 366	zlib_deflateEnd(&c->zstream);
 367}
 368
 369static void compress_fini(struct i915_vma_compress *c)
 370{
 371	kfree(c->zstream.workspace);
 372	if (c->tmp)
 373		pool_free(&c->pool, c->tmp);
 374	pool_fini(&c->pool);
 375}
 376
 377static void err_compression_marker(struct drm_i915_error_state_buf *m)
 378{
 379	err_puts(m, ":");
 380}
 381
 382#else
 383
 384struct i915_vma_compress {
 385	struct folio_batch pool;
 386};
 387
 388static bool compress_init(struct i915_vma_compress *c)
 389{
 390	return pool_init(&c->pool, ALLOW_FAIL) == 0;
 391}
 392
 393static bool compress_start(struct i915_vma_compress *c)
 394{
 395	return true;
 396}
 397
 398static int compress_page(struct i915_vma_compress *c,
 399			 void *src,
 400			 struct i915_vma_coredump *dst,
 401			 bool wc)
 402{
 
 403	void *ptr;
 404
 405	ptr = pool_alloc(&c->pool, ALLOW_FAIL);
 406	if (!ptr)
 407		return -ENOMEM;
 408
 409	if (!(wc && i915_memcpy_from_wc(ptr, src, PAGE_SIZE)))
 
 410		memcpy(ptr, src, PAGE_SIZE);
 411	list_add_tail(&virt_to_page(ptr)->lru, &dst->page_list);
 412	cond_resched();
 413
 414	return 0;
 415}
 416
 417static int compress_flush(struct i915_vma_compress *c,
 418			  struct i915_vma_coredump *dst)
 419{
 420	return 0;
 421}
 422
 423static void compress_finish(struct i915_vma_compress *c)
 424{
 425}
 426
 427static void compress_fini(struct i915_vma_compress *c)
 428{
 429	pool_fini(&c->pool);
 430}
 431
 432static void err_compression_marker(struct drm_i915_error_state_buf *m)
 433{
 434	err_puts(m, "~");
 435}
 436
 437#endif
 438
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 439static void error_print_instdone(struct drm_i915_error_state_buf *m,
 440				 const struct intel_engine_coredump *ee)
 441{
 442	int slice;
 443	int subslice;
 444	int iter;
 445
 446	err_printf(m, "  INSTDONE: 0x%08x\n",
 447		   ee->instdone.instdone);
 448
 449	if (ee->engine->class != RENDER_CLASS || GRAPHICS_VER(m->i915) <= 3)
 450		return;
 451
 452	err_printf(m, "  SC_INSTDONE: 0x%08x\n",
 453		   ee->instdone.slice_common);
 454
 455	if (GRAPHICS_VER(m->i915) <= 6)
 456		return;
 457
 458	for_each_ss_steering(iter, ee->engine->gt, slice, subslice)
 459		err_printf(m, "  SAMPLER_INSTDONE[%d][%d]: 0x%08x\n",
 460			   slice, subslice,
 461			   ee->instdone.sampler[slice][subslice]);
 462
 463	for_each_ss_steering(iter, ee->engine->gt, slice, subslice)
 464		err_printf(m, "  ROW_INSTDONE[%d][%d]: 0x%08x\n",
 465			   slice, subslice,
 466			   ee->instdone.row[slice][subslice]);
 
 467
 468	if (GRAPHICS_VER(m->i915) < 12)
 469		return;
 470
 471	if (GRAPHICS_VER_FULL(m->i915) >= IP_VER(12, 55)) {
 472		for_each_ss_steering(iter, ee->engine->gt, slice, subslice)
 473			err_printf(m, "  GEOM_SVGUNIT_INSTDONE[%d][%d]: 0x%08x\n",
 474				   slice, subslice,
 475				   ee->instdone.geom_svg[slice][subslice]);
 476	}
 477
 478	err_printf(m, "  SC_INSTDONE_EXTRA: 0x%08x\n",
 479		   ee->instdone.slice_common_extra[0]);
 480	err_printf(m, "  SC_INSTDONE_EXTRA2: 0x%08x\n",
 481		   ee->instdone.slice_common_extra[1]);
 482}
 483
 484static void error_print_request(struct drm_i915_error_state_buf *m,
 485				const char *prefix,
 486				const struct i915_request_coredump *erq)
 487{
 488	if (!erq->seqno)
 489		return;
 490
 491	err_printf(m, "%s pid %d, seqno %8x:%08x%s%s, prio %d, head %08x, tail %08x\n",
 492		   prefix, erq->pid, erq->context, erq->seqno,
 493		   test_bit(DMA_FENCE_FLAG_SIGNALED_BIT,
 494			    &erq->flags) ? "!" : "",
 495		   test_bit(DMA_FENCE_FLAG_ENABLE_SIGNAL_BIT,
 496			    &erq->flags) ? "+" : "",
 497		   erq->sched_attr.priority,
 498		   erq->head, erq->tail);
 499}
 500
 501static void error_print_context(struct drm_i915_error_state_buf *m,
 502				const char *header,
 503				const struct i915_gem_context_coredump *ctx)
 504{
 505	err_printf(m, "%s%s[%d] prio %d, guilty %d active %d, runtime total %lluns, avg %lluns\n",
 506		   header, ctx->comm, ctx->pid, ctx->sched_attr.priority,
 507		   ctx->guilty, ctx->active,
 508		   ctx->total_runtime, ctx->avg_runtime);
 509	err_printf(m, "  context timeline seqno %u\n", ctx->hwsp_seqno);
 510}
 511
 512static struct i915_vma_coredump *
 513__find_vma(struct i915_vma_coredump *vma, const char *name)
 514{
 515	while (vma) {
 516		if (strcmp(vma->name, name) == 0)
 517			return vma;
 518		vma = vma->next;
 519	}
 520
 521	return NULL;
 522}
 523
 524static struct i915_vma_coredump *
 525intel_gpu_error_find_batch(const struct intel_engine_coredump *ee)
 526{
 527	return __find_vma(ee->vma, "batch");
 
 
 
 528}
 529
 530static void error_print_engine(struct drm_i915_error_state_buf *m,
 531			       const struct intel_engine_coredump *ee)
 532{
 533	struct i915_vma_coredump *batch;
 534	int n;
 535
 536	err_printf(m, "%s command stream:\n", ee->engine->name);
 537	err_printf(m, "  CCID:  0x%08x\n", ee->ccid);
 
 538	err_printf(m, "  START: 0x%08x\n", ee->start);
 539	err_printf(m, "  HEAD:  0x%08x [0x%08x]\n", ee->head, ee->rq_head);
 540	err_printf(m, "  TAIL:  0x%08x [0x%08x, 0x%08x]\n",
 541		   ee->tail, ee->rq_post, ee->rq_tail);
 542	err_printf(m, "  CTL:   0x%08x\n", ee->ctl);
 543	err_printf(m, "  MODE:  0x%08x\n", ee->mode);
 544	err_printf(m, "  HWS:   0x%08x\n", ee->hws);
 545	err_printf(m, "  ACTHD: 0x%08x %08x\n",
 546		   (u32)(ee->acthd>>32), (u32)ee->acthd);
 547	err_printf(m, "  IPEIR: 0x%08x\n", ee->ipeir);
 548	err_printf(m, "  IPEHR: 0x%08x\n", ee->ipehr);
 549	err_printf(m, "  ESR:   0x%08x\n", ee->esr);
 550
 551	error_print_instdone(m, ee);
 552
 553	batch = intel_gpu_error_find_batch(ee);
 554	if (batch) {
 555		u64 start = batch->gtt_offset;
 556		u64 end = start + batch->gtt_size;
 557
 558		err_printf(m, "  batch: [0x%08x_%08x, 0x%08x_%08x]\n",
 559			   upper_32_bits(start), lower_32_bits(start),
 560			   upper_32_bits(end), lower_32_bits(end));
 561	}
 562	if (GRAPHICS_VER(m->i915) >= 4) {
 563		err_printf(m, "  BBADDR: 0x%08x_%08x\n",
 564			   (u32)(ee->bbaddr>>32), (u32)ee->bbaddr);
 565		err_printf(m, "  BB_STATE: 0x%08x\n", ee->bbstate);
 566		err_printf(m, "  INSTPS: 0x%08x\n", ee->instps);
 567	}
 568	err_printf(m, "  INSTPM: 0x%08x\n", ee->instpm);
 569	err_printf(m, "  FADDR: 0x%08x %08x\n", upper_32_bits(ee->faddr),
 570		   lower_32_bits(ee->faddr));
 571	if (GRAPHICS_VER(m->i915) >= 6) {
 572		err_printf(m, "  RC PSMI: 0x%08x\n", ee->rc_psmi);
 573		err_printf(m, "  FAULT_REG: 0x%08x\n", ee->fault_reg);
 
 
 
 
 
 
 
 574	}
 575	if (GRAPHICS_VER(m->i915) >= 11) {
 576		err_printf(m, "  NOPID: 0x%08x\n", ee->nopid);
 577		err_printf(m, "  EXCC: 0x%08x\n", ee->excc);
 578		err_printf(m, "  CMD_CCTL: 0x%08x\n", ee->cmd_cctl);
 579		err_printf(m, "  CSCMDOP: 0x%08x\n", ee->cscmdop);
 580		err_printf(m, "  CTX_SR_CTL: 0x%08x\n", ee->ctx_sr_ctl);
 581		err_printf(m, "  DMA_FADDR_HI: 0x%08x\n", ee->dma_faddr_hi);
 582		err_printf(m, "  DMA_FADDR_LO: 0x%08x\n", ee->dma_faddr_lo);
 583	}
 584	if (HAS_PPGTT(m->i915)) {
 585		err_printf(m, "  GFX_MODE: 0x%08x\n", ee->vm_info.gfx_mode);
 586
 587		if (GRAPHICS_VER(m->i915) >= 8) {
 588			int i;
 589			for (i = 0; i < 4; i++)
 590				err_printf(m, "  PDP%d: 0x%016llx\n",
 591					   i, ee->vm_info.pdp[i]);
 592		} else {
 593			err_printf(m, "  PP_DIR_BASE: 0x%08x\n",
 594				   ee->vm_info.pp_dir_base);
 595		}
 596	}
 
 
 
 
 
 
 
 
 
 
 
 
 597
 598	for (n = 0; n < ee->num_ports; n++) {
 599		err_printf(m, "  ELSP[%d]:", n);
 600		error_print_request(m, " ", &ee->execlist[n]);
 601	}
 
 
 602}
 603
 604void i915_error_printf(struct drm_i915_error_state_buf *e, const char *f, ...)
 605{
 606	va_list args;
 607
 608	va_start(args, f);
 609	i915_error_vprintf(e, f, args);
 610	va_end(args);
 611}
 612
 613static void intel_gpu_error_print_vma(struct drm_i915_error_state_buf *m,
 614				      const struct intel_engine_cs *engine,
 615				      const struct i915_vma_coredump *vma)
 616{
 617	char out[ASCII85_BUFSZ];
 618	struct page *page;
 619
 620	if (!vma)
 621		return;
 
 
 622
 623	err_printf(m, "%s --- %s = 0x%08x %08x\n",
 624		   engine ? engine->name : "global", vma->name,
 625		   upper_32_bits(vma->gtt_offset),
 626		   lower_32_bits(vma->gtt_offset));
 627
 628	if (vma->gtt_page_sizes > I915_GTT_PAGE_SIZE_4K)
 629		err_printf(m, "gtt_page_sizes = 0x%08x\n", vma->gtt_page_sizes);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 630
 631	err_compression_marker(m);
 632	list_for_each_entry(page, &vma->page_list, lru) {
 633		int i, len;
 634		const u32 *addr = page_address(page);
 635
 636		len = PAGE_SIZE;
 637		if (page == list_last_entry(&vma->page_list, typeof(*page), lru))
 638			len -= vma->unused;
 639		len = ascii85_encode_len(len);
 640
 641		for (i = 0; i < len; i++)
 642			err_puts(m, ascii85_encode(addr[i], out));
 
 
 
 
 643	}
 644	err_puts(m, "\n");
 645}
 646
 647static void err_print_capabilities(struct drm_i915_error_state_buf *m,
 648				   struct i915_gpu_coredump *error)
 
 649{
 650	struct drm_printer p = i915_error_printer(m);
 651
 652	intel_device_info_print(&error->device_info, &error->runtime_info, &p);
 653	intel_driver_caps_print(&error->driver_caps, &p);
 
 654}
 655
 656static void err_print_params(struct drm_i915_error_state_buf *m,
 657			     const struct i915_params *params)
 658{
 659	struct drm_printer p = i915_error_printer(m);
 660
 661	i915_params_dump(params, &p);
 662}
 663
 664static void err_print_pciid(struct drm_i915_error_state_buf *m,
 665			    struct drm_i915_private *i915)
 666{
 667	struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
 668
 669	err_printf(m, "PCI ID: 0x%04x\n", pdev->device);
 670	err_printf(m, "PCI Revision: 0x%02x\n", pdev->revision);
 671	err_printf(m, "PCI Subsystem: %04x:%04x\n",
 672		   pdev->subsystem_vendor,
 673		   pdev->subsystem_device);
 674}
 675
 676static void err_print_guc_ctb(struct drm_i915_error_state_buf *m,
 677			      const char *name,
 678			      const struct intel_ctb_coredump *ctb)
 679{
 680	if (!ctb->size)
 681		return;
 682
 683	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",
 684		   name, ctb->raw_status, ctb->raw_head, ctb->raw_tail,
 685		   ctb->head, ctb->tail, ctb->desc_offset, ctb->cmds_offset, ctb->size);
 686}
 687
 688static void err_print_uc(struct drm_i915_error_state_buf *m,
 689			 const struct intel_uc_coredump *error_uc)
 690{
 691	struct drm_printer p = i915_error_printer(m);
 
 
 
 
 
 692
 693	intel_uc_fw_dump(&error_uc->guc_fw, &p);
 694	intel_uc_fw_dump(&error_uc->huc_fw, &p);
 695	err_printf(m, "GuC timestamp: 0x%08x\n", error_uc->guc.timestamp);
 696	intel_gpu_error_print_vma(m, NULL, error_uc->guc.vma_log);
 697	err_printf(m, "GuC CTB fence: %d\n", error_uc->guc.last_fence);
 698	err_print_guc_ctb(m, "Send", error_uc->guc.ctb + 0);
 699	err_print_guc_ctb(m, "Recv", error_uc->guc.ctb + 1);
 700	intel_gpu_error_print_vma(m, NULL, error_uc->guc.vma_ctb);
 701}
 702
 703static void err_free_sgl(struct scatterlist *sgl)
 704{
 705	while (sgl) {
 706		struct scatterlist *sg;
 707
 708		for (sg = sgl; !sg_is_chain(sg); sg++) {
 709			kfree(sg_virt(sg));
 710			if (sg_is_last(sg))
 711				break;
 712		}
 713
 714		sg = sg_is_last(sg) ? NULL : sg_chain_ptr(sg);
 715		free_page((unsigned long)sgl);
 716		sgl = sg;
 717	}
 718}
 719
 720static void err_print_gt_info(struct drm_i915_error_state_buf *m,
 721			      struct intel_gt_coredump *gt)
 722{
 723	struct drm_printer p = i915_error_printer(m);
 724
 725	intel_gt_info_print(&gt->info, &p);
 726	intel_sseu_print_topology(gt->_gt->i915, &gt->info.sseu, &p);
 727}
 728
 729static void err_print_gt_display(struct drm_i915_error_state_buf *m,
 730				 struct intel_gt_coredump *gt)
 731{
 732	err_printf(m, "IER: 0x%08x\n", gt->ier);
 733	err_printf(m, "DERRMR: 0x%08x\n", gt->derrmr);
 734}
 735
 736static void err_print_gt_global_nonguc(struct drm_i915_error_state_buf *m,
 737				       struct intel_gt_coredump *gt)
 738{
 739	int i;
 740
 741	err_printf(m, "GT awake: %s\n", str_yes_no(gt->awake));
 742	err_printf(m, "CS timestamp frequency: %u Hz, %d ns\n",
 743		   gt->clock_frequency, gt->clock_period_ns);
 744	err_printf(m, "EIR: 0x%08x\n", gt->eir);
 745	err_printf(m, "PGTBL_ER: 0x%08x\n", gt->pgtbl_er);
 746
 747	for (i = 0; i < gt->ngtier; i++)
 748		err_printf(m, "GTIER[%d]: 0x%08x\n", i, gt->gtier[i]);
 749}
 750
 751static void err_print_gt_global(struct drm_i915_error_state_buf *m,
 752				struct intel_gt_coredump *gt)
 753{
 754	err_printf(m, "FORCEWAKE: 0x%08x\n", gt->forcewake);
 755
 756	if (IS_GRAPHICS_VER(m->i915, 6, 11)) {
 757		err_printf(m, "ERROR: 0x%08x\n", gt->error);
 758		err_printf(m, "DONE_REG: 0x%08x\n", gt->done_reg);
 759	}
 760
 761	if (GRAPHICS_VER(m->i915) >= 8)
 762		err_printf(m, "FAULT_TLB_DATA: 0x%08x 0x%08x\n",
 763			   gt->fault_data1, gt->fault_data0);
 764
 765	if (GRAPHICS_VER(m->i915) == 7)
 766		err_printf(m, "ERR_INT: 0x%08x\n", gt->err_int);
 767
 768	if (IS_GRAPHICS_VER(m->i915, 8, 11))
 769		err_printf(m, "GTT_CACHE_EN: 0x%08x\n", gt->gtt_cache);
 770
 771	if (GRAPHICS_VER(m->i915) == 12)
 772		err_printf(m, "AUX_ERR_DBG: 0x%08x\n", gt->aux_err);
 773
 774	if (GRAPHICS_VER(m->i915) >= 12) {
 775		int i;
 776
 777		for (i = 0; i < I915_MAX_SFC; i++) {
 778			/*
 779			 * SFC_DONE resides in the VD forcewake domain, so it
 780			 * only exists if the corresponding VCS engine is
 781			 * present.
 782			 */
 783			if ((gt->_gt->info.sfc_mask & BIT(i)) == 0 ||
 784			    !HAS_ENGINE(gt->_gt, _VCS(i * 2)))
 785				continue;
 786
 787			err_printf(m, "  SFC_DONE[%d]: 0x%08x\n", i,
 788				   gt->sfc_done[i]);
 789		}
 790
 791		err_printf(m, "  GAM_DONE: 0x%08x\n", gt->gam_done);
 792	}
 793}
 794
 795static void err_print_gt_fences(struct drm_i915_error_state_buf *m,
 796				struct intel_gt_coredump *gt)
 797{
 798	int i;
 799
 800	for (i = 0; i < gt->nfence; i++)
 801		err_printf(m, "  fence[%d] = %08llx\n", i, gt->fence[i]);
 802}
 803
 804static void err_print_gt_engines(struct drm_i915_error_state_buf *m,
 805				 struct intel_gt_coredump *gt)
 806{
 807	const struct intel_engine_coredump *ee;
 808
 809	for (ee = gt->engine; ee; ee = ee->next) {
 810		const struct i915_vma_coredump *vma;
 811
 812		if (gt->uc && gt->uc->guc.is_guc_capture) {
 813			if (ee->guc_capture_node)
 814				intel_guc_capture_print_engine_node(m, ee);
 815			else
 816				err_printf(m, "  Missing GuC capture node for %s\n",
 817					   ee->engine->name);
 818		} else {
 819			error_print_engine(m, ee);
 820		}
 821
 822		err_printf(m, "  hung: %u\n", ee->hung);
 823		err_printf(m, "  engine reset count: %u\n", ee->reset_count);
 824		error_print_context(m, "  Active context: ", &ee->context);
 825
 826		for (vma = ee->vma; vma; vma = vma->next)
 827			intel_gpu_error_print_vma(m, ee->engine, vma);
 
 828	}
 829
 830}
 831
 832static void __err_print_to_sgl(struct drm_i915_error_state_buf *m,
 833			       struct i915_gpu_coredump *error)
 834{
 835	struct drm_printer p = i915_error_printer(m);
 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	err_printf(m, "RPM wakelock: %s\n", str_yes_no(error->wakelock));
 874	err_printf(m, "PM suspended: %s\n", str_yes_no(error->suspended));
 875
 876	if (error->gt) {
 877		bool print_guc_capture = false;
 878
 879		if (error->gt->uc && error->gt->uc->guc.is_guc_capture)
 880			print_guc_capture = true;
 
 
 
 
 881
 882		err_print_gt_display(m, error->gt);
 883		err_print_gt_global_nonguc(m, error->gt);
 884		err_print_gt_fences(m, error->gt);
 
 
 
 
 
 
 
 
 
 885
 886		/*
 887		 * GuC dumped global, eng-class and eng-instance registers together
 888		 * as part of engine state dump so we print in err_print_gt_engines
 889		 */
 890		if (!print_guc_capture)
 891			err_print_gt_global(m, error->gt);
 892
 893		err_print_gt_engines(m, error->gt);
 
 894
 895		if (error->gt->uc)
 896			err_print_uc(m, error->gt->uc);
 
 897
 898		err_print_gt_info(m, error->gt);
 899	}
 900
 901	err_print_capabilities(m, error);
 902	err_print_params(m, &error->params);
 903
 904	intel_display_snapshot_print(error->display_snapshot, &p);
 905}
 
 
 906
 907static int err_print_to_sgl(struct i915_gpu_coredump *error)
 908{
 909	struct drm_i915_error_state_buf m;
 910
 911	if (IS_ERR(error))
 912		return PTR_ERR(error);
 913
 914	if (READ_ONCE(error->sgl))
 915		return 0;
 
 
 916
 917	memset(&m, 0, sizeof(m));
 918	m.i915 = error->i915;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 919
 920	__err_print_to_sgl(&m, error);
 
 921
 922	if (m.buf) {
 923		__sg_set_buf(m.cur++, m.buf, m.bytes, m.iter);
 924		m.bytes = 0;
 925		m.buf = NULL;
 926	}
 927	if (m.cur) {
 928		GEM_BUG_ON(m.end < m.cur);
 929		sg_mark_end(m.cur - 1);
 930	}
 931	GEM_BUG_ON(m.sgl && !m.cur);
 932
 933	if (m.err) {
 934		err_free_sgl(m.sgl);
 935		return m.err;
 936	}
 937
 938	if (cmpxchg(&error->sgl, NULL, m.sgl))
 939		err_free_sgl(m.sgl);
 940
 941	return 0;
 942}
 943
 944ssize_t i915_gpu_coredump_copy_to_buffer(struct i915_gpu_coredump *error,
 945					 char *buf, loff_t off, size_t rem)
 946{
 947	struct scatterlist *sg;
 948	size_t count;
 949	loff_t pos;
 950	int err;
 951
 952	if (!error || !rem)
 953		return 0;
 954
 955	err = err_print_to_sgl(error);
 956	if (err)
 957		return err;
 958
 959	sg = READ_ONCE(error->fit);
 960	if (!sg || off < sg->dma_address)
 961		sg = error->sgl;
 962	if (!sg)
 963		return 0;
 964
 965	pos = sg->dma_address;
 966	count = 0;
 967	do {
 968		size_t len, start;
 969
 970		if (sg_is_chain(sg)) {
 971			sg = sg_chain_ptr(sg);
 972			GEM_BUG_ON(sg_is_chain(sg));
 973		}
 974
 975		len = sg->length;
 976		if (pos + len <= off) {
 977			pos += len;
 978			continue;
 979		}
 980
 981		start = sg->offset;
 982		if (pos < off) {
 983			GEM_BUG_ON(off - pos > len);
 984			len -= off - pos;
 985			start += off - pos;
 986			pos = off;
 987		}
 988
 989		len = min(len, rem);
 990		GEM_BUG_ON(!len || len > sg->length);
 
 
 
 
 991
 992		memcpy(buf, page_address(sg_page(sg)) + start, len);
 
 
 
 993
 994		count += len;
 995		pos += len;
 
 
 996
 997		buf += len;
 998		rem -= len;
 999		if (!rem) {
1000			WRITE_ONCE(error->fit, sg);
1001			break;
1002		}
1003	} while (!sg_is_last(sg++));
1004
1005	return count;
1006}
1007
1008static void i915_vma_coredump_free(struct i915_vma_coredump *vma)
1009{
1010	while (vma) {
1011		struct i915_vma_coredump *next = vma->next;
1012		struct page *page, *n;
1013
1014		list_for_each_entry_safe(page, n, &vma->page_list, lru) {
1015			list_del_init(&page->lru);
1016			__free_page(page);
1017		}
1018
1019		kfree(vma);
1020		vma = next;
1021	}
 
1022}
1023
1024static void cleanup_params(struct i915_gpu_coredump *error)
1025{
1026	i915_params_free(&error->params);
 
1027}
1028
1029static void cleanup_uc(struct intel_uc_coredump *uc)
1030{
1031	kfree(uc->guc_fw.file_selected.path);
1032	kfree(uc->huc_fw.file_selected.path);
1033	kfree(uc->guc_fw.file_wanted.path);
1034	kfree(uc->huc_fw.file_wanted.path);
1035	i915_vma_coredump_free(uc->guc.vma_log);
1036	i915_vma_coredump_free(uc->guc.vma_ctb);
1037
1038	kfree(uc);
1039}
1040
1041static void cleanup_gt(struct intel_gt_coredump *gt)
1042{
1043	while (gt->engine) {
1044		struct intel_engine_coredump *ee = gt->engine;
1045
1046		gt->engine = ee->next;
1047
1048		i915_vma_coredump_free(ee->vma);
1049		intel_guc_capture_free_node(ee);
1050		kfree(ee);
1051	}
1052
1053	if (gt->uc)
1054		cleanup_uc(gt->uc);
1055
1056	kfree(gt);
 
 
1057}
1058
1059void __i915_gpu_coredump_free(struct kref *error_ref)
1060{
1061	struct i915_gpu_coredump *error =
1062		container_of(error_ref, typeof(*error), ref);
 
 
 
 
1063
1064	while (error->gt) {
1065		struct intel_gt_coredump *gt = error->gt;
 
1066
1067		error->gt = gt->next;
1068		cleanup_gt(gt);
 
 
 
 
 
 
 
 
1069	}
1070
1071	intel_display_snapshot_free(error->display_snapshot);
 
 
 
 
 
1072
1073	cleanup_params(error);
 
1074
1075	err_free_sgl(error->sgl);
1076	kfree(error);
1077}
1078
1079static struct i915_vma_coredump *
1080i915_vma_coredump_create(const struct intel_gt *gt,
1081			 const struct i915_vma_resource *vma_res,
1082			 struct i915_vma_compress *compress,
1083			 const char *name)
1084
1085{
1086	struct i915_ggtt *ggtt = gt->ggtt;
1087	const u64 slot = ggtt->error_capture.start;
1088	struct i915_vma_coredump *dst;
 
 
1089	struct sgt_iter iter;
1090	int ret;
1091
1092	might_sleep();
1093
1094	if (!vma_res || !vma_res->bi.pages || !compress)
1095		return NULL;
1096
1097	dst = kmalloc(sizeof(*dst), ALLOW_FAIL);
 
 
 
1098	if (!dst)
1099		return NULL;
1100
1101	if (!compress_start(compress)) {
 
 
 
 
 
1102		kfree(dst);
1103		return NULL;
1104	}
1105
1106	INIT_LIST_HEAD(&dst->page_list);
1107	strscpy(dst->name, name);
1108	dst->next = NULL;
1109
1110	dst->gtt_offset = vma_res->start;
1111	dst->gtt_size = vma_res->node_size;
1112	dst->gtt_page_sizes = vma_res->page_sizes_gtt;
1113	dst->unused = 0;
1114
1115	ret = -EINVAL;
1116	if (drm_mm_node_allocated(&ggtt->error_capture)) {
1117		void __iomem *s;
1118		dma_addr_t dma;
1119
1120		for_each_sgt_daddr(dma, iter, vma_res->bi.pages) {
1121			mutex_lock(&ggtt->error_mutex);
1122			if (ggtt->vm.raw_insert_page)
1123				ggtt->vm.raw_insert_page(&ggtt->vm, dma, slot,
1124							 i915_gem_get_pat_index(gt->i915,
1125										I915_CACHE_NONE),
1126							 0);
1127			else
1128				ggtt->vm.insert_page(&ggtt->vm, dma, slot,
1129						     i915_gem_get_pat_index(gt->i915,
1130									    I915_CACHE_NONE),
1131						     0);
1132			mb();
1133
1134			s = io_mapping_map_wc(&ggtt->iomap, slot, PAGE_SIZE);
1135			ret = compress_page(compress,
1136					    (void  __force *)s, dst,
1137					    true);
1138			io_mapping_unmap(s);
1139
1140			mb();
1141			ggtt->vm.clear_range(&ggtt->vm, slot, PAGE_SIZE);
1142			mutex_unlock(&ggtt->error_mutex);
1143			if (ret)
1144				break;
1145		}
1146	} else if (vma_res->bi.lmem) {
1147		struct intel_memory_region *mem = vma_res->mr;
1148		dma_addr_t dma;
1149
1150		for_each_sgt_daddr(dma, iter, vma_res->bi.pages) {
1151			dma_addr_t offset = dma - mem->region.start;
1152			void __iomem *s;
1153
1154			if (offset + PAGE_SIZE > resource_size(&mem->io)) {
1155				ret = -EINVAL;
1156				break;
1157			}
1158
1159			s = io_mapping_map_wc(&mem->iomap, offset, PAGE_SIZE);
1160			ret = compress_page(compress,
1161					    (void __force *)s, dst,
1162					    true);
1163			io_mapping_unmap(s);
1164			if (ret)
1165				break;
1166		}
1167	} else {
1168		struct page *page;
1169
1170		for_each_sgt_page(page, iter, vma_res->bi.pages) {
1171			void *s;
 
 
 
1172
1173			drm_clflush_pages(&page, 1);
 
 
 
 
1174
1175			s = kmap_local_page(page);
1176			ret = compress_page(compress, s, dst, false);
1177			kunmap_local(s);
 
 
 
 
1178
1179			drm_clflush_pages(&page, 1);
 
 
1180
1181			if (ret)
1182				break;
1183		}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1184	}
1185
1186	if (ret || compress_flush(compress, dst)) {
1187		struct page *page, *n;
1188
1189		list_for_each_entry_safe_reverse(page, n, &dst->page_list, lru) {
1190			list_del_init(&page->lru);
1191			pool_free(&compress->pool, page_address(page));
1192		}
 
 
 
 
 
 
 
 
 
 
 
1193
1194		kfree(dst);
1195		dst = NULL;
 
 
 
 
 
 
 
 
 
 
 
1196	}
1197	compress_finish(compress);
1198
1199	return dst;
1200}
1201
1202static void gt_record_fences(struct intel_gt_coredump *gt)
1203{
1204	struct i915_ggtt *ggtt = gt->_gt->ggtt;
1205	struct intel_uncore *uncore = gt->_gt->uncore;
1206	int i;
1207
1208	if (GRAPHICS_VER(uncore->i915) >= 6) {
1209		for (i = 0; i < ggtt->num_fences; i++)
1210			gt->fence[i] =
1211				intel_uncore_read64(uncore,
1212						    FENCE_REG_GEN6_LO(i));
1213	} else if (GRAPHICS_VER(uncore->i915) >= 4) {
1214		for (i = 0; i < ggtt->num_fences; i++)
1215			gt->fence[i] =
1216				intel_uncore_read64(uncore,
1217						    FENCE_REG_965_LO(i));
1218	} else {
1219		for (i = 0; i < ggtt->num_fences; i++)
1220			gt->fence[i] =
1221				intel_uncore_read(uncore, FENCE_REG(i));
1222	}
1223	gt->nfence = i;
1224}
1225
1226static void engine_record_registers(struct intel_engine_coredump *ee)
1227{
1228	const struct intel_engine_cs *engine = ee->engine;
1229	struct drm_i915_private *i915 = engine->i915;
1230
1231	if (GRAPHICS_VER(i915) >= 6) {
1232		ee->rc_psmi = ENGINE_READ(engine, RING_PSMI_CTL);
1233
1234		/*
1235		 * For the media GT, this ring fault register is not replicated,
1236		 * so don't do multicast/replicated register read/write
1237		 * operation on it.
1238		 */
1239		if (MEDIA_VER(i915) >= 13 && engine->gt->type == GT_MEDIA)
1240			ee->fault_reg = intel_uncore_read(engine->uncore,
1241							  XELPMP_RING_FAULT_REG);
1242		else if (GRAPHICS_VER_FULL(i915) >= IP_VER(12, 55))
1243			ee->fault_reg = intel_gt_mcr_read_any(engine->gt,
1244							      XEHP_RING_FAULT_REG);
1245		else if (GRAPHICS_VER(i915) >= 12)
1246			ee->fault_reg = intel_uncore_read(engine->uncore,
1247							  GEN12_RING_FAULT_REG);
1248		else if (GRAPHICS_VER(i915) >= 8)
1249			ee->fault_reg = intel_uncore_read(engine->uncore,
1250							  GEN8_RING_FAULT_REG);
1251		else
1252			ee->fault_reg = GEN6_RING_FAULT_REG_READ(engine);
1253	}
1254
1255	if (GRAPHICS_VER(i915) >= 4) {
1256		ee->esr = ENGINE_READ(engine, RING_ESR);
1257		ee->faddr = ENGINE_READ(engine, RING_DMA_FADD);
1258		ee->ipeir = ENGINE_READ(engine, RING_IPEIR);
1259		ee->ipehr = ENGINE_READ(engine, RING_IPEHR);
1260		ee->instps = ENGINE_READ(engine, RING_INSTPS);
1261		ee->bbaddr = ENGINE_READ(engine, RING_BBADDR);
1262		ee->ccid = ENGINE_READ(engine, CCID);
1263		if (GRAPHICS_VER(i915) >= 8) {
1264			ee->faddr |= (u64)ENGINE_READ(engine, RING_DMA_FADD_UDW) << 32;
1265			ee->bbaddr |= (u64)ENGINE_READ(engine, RING_BBADDR_UDW) << 32;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1266		}
1267		ee->bbstate = ENGINE_READ(engine, RING_BBSTATE);
1268	} else {
1269		ee->faddr = ENGINE_READ(engine, DMA_FADD_I8XX);
1270		ee->ipeir = ENGINE_READ(engine, IPEIR);
1271		ee->ipehr = ENGINE_READ(engine, IPEHR);
1272	}
1273
1274	if (GRAPHICS_VER(i915) >= 11) {
1275		ee->cmd_cctl = ENGINE_READ(engine, RING_CMD_CCTL);
1276		ee->cscmdop = ENGINE_READ(engine, RING_CSCMDOP);
1277		ee->ctx_sr_ctl = ENGINE_READ(engine, RING_CTX_SR_CTL);
1278		ee->dma_faddr_hi = ENGINE_READ(engine, RING_DMA_FADD_UDW);
1279		ee->dma_faddr_lo = ENGINE_READ(engine, RING_DMA_FADD);
1280		ee->nopid = ENGINE_READ(engine, RING_NOPID);
1281		ee->excc = ENGINE_READ(engine, RING_EXCC);
 
 
 
 
 
 
 
1282	}
1283
1284	intel_engine_get_instdone(engine, &ee->instdone);
1285
1286	ee->instpm = ENGINE_READ(engine, RING_INSTPM);
 
1287	ee->acthd = intel_engine_get_active_head(engine);
1288	ee->start = ENGINE_READ(engine, RING_START);
1289	ee->head = ENGINE_READ(engine, RING_HEAD);
1290	ee->tail = ENGINE_READ(engine, RING_TAIL);
1291	ee->ctl = ENGINE_READ(engine, RING_CTL);
1292	if (GRAPHICS_VER(i915) > 2)
1293		ee->mode = ENGINE_READ(engine, RING_MI_MODE);
 
 
1294
1295	if (!HWS_NEEDS_PHYSICAL(i915)) {
1296		i915_reg_t mmio;
1297
1298		if (GRAPHICS_VER(i915) == 7) {
1299			switch (engine->id) {
1300			default:
1301				MISSING_CASE(engine->id);
1302				fallthrough;
1303			case RCS0:
1304				mmio = RENDER_HWS_PGA_GEN7;
1305				break;
1306			case BCS0:
1307				mmio = BLT_HWS_PGA_GEN7;
1308				break;
1309			case VCS0:
1310				mmio = BSD_HWS_PGA_GEN7;
1311				break;
1312			case VECS0:
1313				mmio = VEBOX_HWS_PGA_GEN7;
1314				break;
1315			}
1316		} else if (GRAPHICS_VER(engine->i915) == 6) {
1317			mmio = RING_HWS_PGA_GEN6(engine->mmio_base);
1318		} else {
1319			/* XXX: gen8 returns to sanity */
1320			mmio = RING_HWS_PGA(engine->mmio_base);
1321		}
1322
1323		ee->hws = intel_uncore_read(engine->uncore, mmio);
1324	}
1325
1326	ee->reset_count = i915_reset_engine_count(&i915->gpu_error, engine);
 
 
 
 
 
1327
1328	if (HAS_PPGTT(i915)) {
1329		int i;
1330
1331		ee->vm_info.gfx_mode = ENGINE_READ(engine, RING_MODE_GEN7);
1332
1333		if (GRAPHICS_VER(i915) == 6) {
1334			ee->vm_info.pp_dir_base =
1335				ENGINE_READ(engine, RING_PP_DIR_BASE_READ);
1336		} else if (GRAPHICS_VER(i915) == 7) {
1337			ee->vm_info.pp_dir_base =
1338				ENGINE_READ(engine, RING_PP_DIR_BASE);
1339		} else if (GRAPHICS_VER(i915) >= 8) {
1340			u32 base = engine->mmio_base;
1341
1342			for (i = 0; i < 4; i++) {
1343				ee->vm_info.pdp[i] =
1344					intel_uncore_read(engine->uncore,
1345							  GEN8_RING_PDP_UDW(base, i));
1346				ee->vm_info.pdp[i] <<= 32;
1347				ee->vm_info.pdp[i] |=
1348					intel_uncore_read(engine->uncore,
1349							  GEN8_RING_PDP_LDW(base, i));
1350			}
1351		}
1352	}
1353}
1354
1355static void record_request(const struct i915_request *request,
1356			   struct i915_request_coredump *erq)
1357{
1358	erq->flags = request->fence.flags;
1359	erq->context = request->fence.context;
1360	erq->seqno = request->fence.seqno;
1361	erq->sched_attr = request->sched.attr;
 
1362	erq->head = request->head;
1363	erq->tail = request->tail;
1364
1365	erq->pid = 0;
1366	rcu_read_lock();
1367	if (!intel_context_is_closed(request->context)) {
1368		const struct i915_gem_context *ctx;
1369
1370		ctx = rcu_dereference(request->context->gem_context);
1371		if (ctx)
1372			erq->pid = pid_nr(ctx->pid);
1373	}
1374	rcu_read_unlock();
1375}
1376
1377static void engine_record_execlists(struct intel_engine_coredump *ee)
 
 
1378{
1379	const struct intel_engine_execlists * const el = &ee->engine->execlists;
1380	struct i915_request * const *port = el->active;
1381	unsigned int n = 0;
1382
1383	while (*port)
1384		record_request(*port++, &ee->execlist[n++]);
 
 
 
 
1385
1386	ee->num_ports = n;
1387}
 
1388
1389static bool record_context(struct i915_gem_context_coredump *e,
1390			   struct intel_context *ce)
1391{
1392	struct i915_gem_context *ctx;
1393	struct task_struct *task;
1394	bool simulated;
1395
1396	rcu_read_lock();
1397	ctx = rcu_dereference(ce->gem_context);
1398	if (ctx && !kref_get_unless_zero(&ctx->ref))
1399		ctx = NULL;
1400	rcu_read_unlock();
1401	if (!ctx)
1402		return true;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1403
1404	rcu_read_lock();
1405	task = pid_task(ctx->pid, PIDTYPE_PID);
1406	if (task) {
1407		strscpy(e->comm, task->comm);
1408		e->pid = task->pid;
1409	}
1410	rcu_read_unlock();
1411
1412	e->sched_attr = ctx->sched;
1413	e->guilty = atomic_read(&ctx->guilty_count);
1414	e->active = atomic_read(&ctx->active_count);
1415	e->hwsp_seqno = (ce->timeline && ce->timeline->hwsp_seqno) ?
1416				*ce->timeline->hwsp_seqno : ~0U;
1417
1418	e->total_runtime = intel_context_get_total_runtime_ns(ce);
1419	e->avg_runtime = intel_context_get_avg_runtime_ns(ce);
1420
1421	simulated = i915_gem_context_no_error_capture(ctx);
1422
1423	i915_gem_context_put(ctx);
1424	return simulated;
1425}
1426
1427struct intel_engine_capture_vma {
1428	struct intel_engine_capture_vma *next;
1429	struct i915_vma_resource *vma_res;
1430	char name[16];
1431	bool lockdep_cookie;
1432};
1433
1434static struct intel_engine_capture_vma *
1435capture_vma_snapshot(struct intel_engine_capture_vma *next,
1436		     struct i915_vma_resource *vma_res,
1437		     gfp_t gfp, const char *name)
1438{
1439	struct intel_engine_capture_vma *c;
 
1440
1441	if (!vma_res)
1442		return next;
1443
1444	c = kmalloc(sizeof(*c), gfp);
1445	if (!c)
1446		return next;
1447
1448	if (!i915_vma_resource_hold(vma_res, &c->lockdep_cookie)) {
1449		kfree(c);
1450		return next;
1451	}
1452
1453	strscpy(c->name, name);
1454	c->vma_res = i915_vma_resource_get(vma_res);
1455
1456	c->next = next;
1457	return c;
1458}
1459
1460static struct intel_engine_capture_vma *
1461capture_vma(struct intel_engine_capture_vma *next,
1462	    struct i915_vma *vma,
1463	    const char *name,
1464	    gfp_t gfp)
1465{
1466	if (!vma)
1467		return next;
1468
1469	/*
1470	 * If the vma isn't pinned, then the vma should be snapshotted
1471	 * to a struct i915_vma_snapshot at command submission time.
1472	 * Not here.
1473	 */
1474	if (GEM_WARN_ON(!i915_vma_is_pinned(vma)))
1475		return next;
1476
1477	next = capture_vma_snapshot(next, vma->resource, gfp, name);
1478
1479	return next;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1480}
1481
1482static struct intel_engine_capture_vma *
1483capture_user(struct intel_engine_capture_vma *capture,
1484	     const struct i915_request *rq,
1485	     gfp_t gfp)
1486{
1487	struct i915_capture_list *c;
 
 
1488
1489	for (c = rq->capture_list; c; c = c->next)
1490		capture = capture_vma_snapshot(capture, c->vma_res, gfp,
1491					       "user");
1492
1493	return capture;
1494}
 
 
 
1495
1496static void add_vma(struct intel_engine_coredump *ee,
1497		    struct i915_vma_coredump *vma)
1498{
1499	if (vma) {
1500		vma->next = ee->vma;
1501		ee->vma = vma;
1502	}
 
 
 
1503}
1504
1505static struct i915_vma_coredump *
1506create_vma_coredump(const struct intel_gt *gt, struct i915_vma *vma,
1507		    const char *name, struct i915_vma_compress *compress)
1508{
1509	struct i915_vma_coredump *ret = NULL;
1510	struct i915_vma_resource *vma_res;
1511	bool lockdep_cookie;
 
 
 
 
1512
1513	if (!vma)
 
1514		return NULL;
1515
1516	vma_res = vma->resource;
1517
1518	if (i915_vma_resource_hold(vma_res, &lockdep_cookie)) {
1519		ret = i915_vma_coredump_create(gt, vma_res, compress, name);
1520		i915_vma_resource_unhold(vma_res, lockdep_cookie);
1521	}
1522
1523	return ret;
1524}
1525
1526static void add_vma_coredump(struct intel_engine_coredump *ee,
1527			     const struct intel_gt *gt,
1528			     struct i915_vma *vma,
1529			     const char *name,
1530			     struct i915_vma_compress *compress)
1531{
1532	add_vma(ee, create_vma_coredump(gt, vma, name, compress));
1533}
 
1534
1535struct intel_engine_coredump *
1536intel_engine_coredump_alloc(struct intel_engine_cs *engine, gfp_t gfp, u32 dump_flags)
1537{
1538	struct intel_engine_coredump *ee;
1539
1540	ee = kzalloc(sizeof(*ee), gfp);
1541	if (!ee)
1542		return NULL;
1543
1544	ee->engine = engine;
 
1545
1546	if (!(dump_flags & CORE_DUMP_FLAG_IS_GUC_CAPTURE)) {
1547		engine_record_registers(ee);
1548		engine_record_execlists(ee);
1549	}
1550
1551	return ee;
1552}
 
1553
1554static struct intel_engine_capture_vma *
1555engine_coredump_add_context(struct intel_engine_coredump *ee,
1556			    struct intel_context *ce,
1557			    gfp_t gfp)
1558{
1559	struct intel_engine_capture_vma *vma = NULL;
1560
1561	ee->simulated |= record_context(&ee->context, ce);
1562	if (ee->simulated)
1563		return NULL;
1564
1565	/*
1566	 * We need to copy these to an anonymous buffer
1567	 * as the simplest method to avoid being overwritten
1568	 * by userspace.
1569	 */
1570	vma = capture_vma(vma, ce->ring->vma, "ring", gfp);
1571	vma = capture_vma(vma, ce->state, "HW context", gfp);
1572
1573	return vma;
1574}
 
 
 
 
1575
1576struct intel_engine_capture_vma *
1577intel_engine_coredump_add_request(struct intel_engine_coredump *ee,
1578				  struct i915_request *rq,
1579				  gfp_t gfp)
1580{
1581	struct intel_engine_capture_vma *vma;
1582
1583	vma = engine_coredump_add_context(ee, rq->context, gfp);
1584	if (!vma)
1585		return NULL;
1586
1587	/*
1588	 * We need to copy these to an anonymous buffer
1589	 * as the simplest method to avoid being overwritten
1590	 * by userspace.
1591	 */
1592	vma = capture_vma_snapshot(vma, rq->batch_res, gfp, "batch");
1593	vma = capture_user(vma, rq, gfp);
1594
1595	ee->rq_head = rq->head;
1596	ee->rq_post = rq->postfix;
1597	ee->rq_tail = rq->tail;
1598
1599	return vma;
1600}
 
 
 
1601
1602void
1603intel_engine_coredump_add_vma(struct intel_engine_coredump *ee,
1604			      struct intel_engine_capture_vma *capture,
1605			      struct i915_vma_compress *compress)
1606{
1607	const struct intel_engine_cs *engine = ee->engine;
1608
1609	while (capture) {
1610		struct intel_engine_capture_vma *this = capture;
1611		struct i915_vma_resource *vma_res = this->vma_res;
1612
1613		add_vma(ee,
1614			i915_vma_coredump_create(engine->gt, vma_res,
1615						 compress, this->name));
1616
1617		i915_vma_resource_unhold(vma_res, this->lockdep_cookie);
1618		i915_vma_resource_put(vma_res);
1619
1620		capture = this->next;
1621		kfree(this);
1622	}
1623
1624	add_vma_coredump(ee, engine->gt, engine->status_page.vma,
1625			 "HW Status", compress);
1626
1627	add_vma_coredump(ee, engine->gt, engine->wa_ctx.vma,
1628			 "WA context", compress);
1629}
1630
1631static struct intel_engine_coredump *
1632capture_engine(struct intel_engine_cs *engine,
1633	       struct i915_vma_compress *compress,
1634	       u32 dump_flags)
1635{
1636	struct intel_engine_capture_vma *capture = NULL;
1637	struct intel_engine_coredump *ee;
1638	struct intel_context *ce = NULL;
1639	struct i915_request *rq = NULL;
1640
1641	ee = intel_engine_coredump_alloc(engine, ALLOW_FAIL, dump_flags);
1642	if (!ee)
1643		return NULL;
1644
1645	intel_engine_get_hung_entity(engine, &ce, &rq);
1646	if (rq && !i915_request_started(rq)) {
1647		/*
1648		 * We want to know also what is the guc_id of the context,
1649		 * but if we don't have the context reference, then skip
1650		 * printing it.
1651		 */
1652		if (ce)
1653			drm_info(&engine->gt->i915->drm,
1654				 "Got hung context on %s with active request %lld:%lld [0x%04X] not yet started\n",
1655				 engine->name, rq->fence.context, rq->fence.seqno, ce->guc_id.id);
1656		else
1657			drm_info(&engine->gt->i915->drm,
1658				 "Got hung context on %s with active request %lld:%lld not yet started\n",
1659				 engine->name, rq->fence.context, rq->fence.seqno);
1660	}
1661
1662	if (rq) {
1663		capture = intel_engine_coredump_add_request(ee, rq, ATOMIC_MAYFAIL);
1664		i915_request_put(rq);
1665	} else if (ce) {
1666		capture = engine_coredump_add_context(ee, ce, ATOMIC_MAYFAIL);
1667	}
1668
1669	if (capture) {
1670		intel_engine_coredump_add_vma(ee, capture, compress);
1671
1672		if (dump_flags & CORE_DUMP_FLAG_IS_GUC_CAPTURE)
1673			intel_guc_capture_get_matching_node(engine->gt, ee, ce);
1674	} else {
1675		kfree(ee);
1676		ee = NULL;
1677	}
 
1678
1679	return ee;
 
 
1680}
1681
1682static void
1683gt_record_engines(struct intel_gt_coredump *gt,
1684		  intel_engine_mask_t engine_mask,
1685		  struct i915_vma_compress *compress,
1686		  u32 dump_flags)
1687{
1688	struct intel_engine_cs *engine;
1689	enum intel_engine_id id;
1690
1691	for_each_engine(engine, gt->_gt, id) {
1692		struct intel_engine_coredump *ee;
1693
1694		/* Refill our page pool before entering atomic section */
1695		pool_refill(&compress->pool, ALLOW_FAIL);
1696
1697		ee = capture_engine(engine, compress, dump_flags);
1698		if (!ee)
1699			continue;
1700
1701		ee->hung = engine->mask & engine_mask;
 
 
 
1702
1703		gt->simulated |= ee->simulated;
1704		if (ee->simulated) {
1705			if (dump_flags & CORE_DUMP_FLAG_IS_GUC_CAPTURE)
1706				intel_guc_capture_free_node(ee);
1707			kfree(ee);
1708			continue;
1709		}
1710
1711		ee->next = gt->engine;
1712		gt->engine = ee;
 
 
 
1713	}
1714}
1715
1716static void gt_record_guc_ctb(struct intel_ctb_coredump *saved,
1717			      const struct intel_guc_ct_buffer *ctb,
1718			      const void *blob_ptr, struct intel_guc *guc)
1719{
1720	if (!ctb || !ctb->desc)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1721		return;
1722
1723	saved->raw_status = ctb->desc->status;
1724	saved->raw_head = ctb->desc->head;
1725	saved->raw_tail = ctb->desc->tail;
1726	saved->head = ctb->head;
1727	saved->tail = ctb->tail;
1728	saved->size = ctb->size;
1729	saved->desc_offset = ((void *)ctb->desc) - blob_ptr;
1730	saved->cmds_offset = ((void *)ctb->cmds) - blob_ptr;
1731}
1732
1733static struct intel_uc_coredump *
1734gt_record_uc(struct intel_gt_coredump *gt,
1735	     struct i915_vma_compress *compress)
1736{
1737	const struct intel_uc *uc = &gt->_gt->uc;
1738	struct intel_uc_coredump *error_uc;
1739
1740	error_uc = kzalloc(sizeof(*error_uc), ALLOW_FAIL);
1741	if (!error_uc)
1742		return NULL;
1743
1744	memcpy(&error_uc->guc_fw, &uc->guc.fw, sizeof(uc->guc.fw));
1745	memcpy(&error_uc->huc_fw, &uc->huc.fw, sizeof(uc->huc.fw));
1746
1747	error_uc->guc_fw.file_selected.path = kstrdup(uc->guc.fw.file_selected.path, ALLOW_FAIL);
1748	error_uc->huc_fw.file_selected.path = kstrdup(uc->huc.fw.file_selected.path, ALLOW_FAIL);
1749	error_uc->guc_fw.file_wanted.path = kstrdup(uc->guc.fw.file_wanted.path, ALLOW_FAIL);
1750	error_uc->huc_fw.file_wanted.path = kstrdup(uc->huc.fw.file_wanted.path, ALLOW_FAIL);
1751
1752	/*
1753	 * Save the GuC log and include a timestamp reference for converting the
1754	 * log times to system times (in conjunction with the error->boottime and
1755	 * gt->clock_frequency fields saved elsewhere).
1756	 */
1757	error_uc->guc.timestamp = intel_uncore_read(gt->_gt->uncore, GUCPMTIMESTAMP);
1758	error_uc->guc.vma_log = create_vma_coredump(gt->_gt, uc->guc.log.vma,
1759						    "GuC log buffer", compress);
1760	error_uc->guc.vma_ctb = create_vma_coredump(gt->_gt, uc->guc.ct.vma,
1761						    "GuC CT buffer", compress);
1762	error_uc->guc.last_fence = uc->guc.ct.requests.last_fence;
1763	gt_record_guc_ctb(error_uc->guc.ctb + 0, &uc->guc.ct.ctbs.send,
1764			  uc->guc.ct.ctbs.send.desc, (struct intel_guc *)&uc->guc);
1765	gt_record_guc_ctb(error_uc->guc.ctb + 1, &uc->guc.ct.ctbs.recv,
1766			  uc->guc.ct.ctbs.send.desc, (struct intel_guc *)&uc->guc);
1767
1768	return error_uc;
1769}
1770
1771/* Capture display registers. */
1772static void gt_record_display_regs(struct intel_gt_coredump *gt)
1773{
1774	struct intel_uncore *uncore = gt->_gt->uncore;
1775	struct drm_i915_private *i915 = uncore->i915;
1776
1777	if (DISPLAY_VER(i915) >= 6 && DISPLAY_VER(i915) < 20)
1778		gt->derrmr = intel_uncore_read(uncore, DERRMR);
1779
1780	if (GRAPHICS_VER(i915) >= 8)
1781		gt->ier = intel_uncore_read(uncore, GEN8_DE_MISC_IER);
1782	else if (IS_VALLEYVIEW(i915))
1783		gt->ier = intel_uncore_read(uncore, VLV_IER);
1784	else if (HAS_PCH_SPLIT(i915))
1785		gt->ier = intel_uncore_read(uncore, DEIER);
1786	else if (GRAPHICS_VER(i915) == 2)
1787		gt->ier = intel_uncore_read16(uncore, GEN2_IER);
1788	else
1789		gt->ier = intel_uncore_read(uncore, GEN2_IER);
1790}
1791
1792/* Capture all other registers that GuC doesn't capture. */
1793static void gt_record_global_nonguc_regs(struct intel_gt_coredump *gt)
1794{
1795	struct intel_uncore *uncore = gt->_gt->uncore;
1796	struct drm_i915_private *i915 = uncore->i915;
1797	int i;
1798
1799	if (IS_VALLEYVIEW(i915)) {
1800		gt->gtier[0] = intel_uncore_read(uncore, GTIER);
1801		gt->ngtier = 1;
1802	} else if (GRAPHICS_VER(i915) >= 11) {
1803		gt->gtier[0] =
1804			intel_uncore_read(uncore,
1805					  GEN11_RENDER_COPY_INTR_ENABLE);
1806		gt->gtier[1] =
1807			intel_uncore_read(uncore, GEN11_VCS_VECS_INTR_ENABLE);
1808		gt->gtier[2] =
1809			intel_uncore_read(uncore, GEN11_GUC_SG_INTR_ENABLE);
1810		gt->gtier[3] =
1811			intel_uncore_read(uncore,
1812					  GEN11_GPM_WGBOXPERF_INTR_ENABLE);
1813		gt->gtier[4] =
1814			intel_uncore_read(uncore,
1815					  GEN11_CRYPTO_RSVD_INTR_ENABLE);
1816		gt->gtier[5] =
1817			intel_uncore_read(uncore,
1818					  GEN11_GUNIT_CSME_INTR_ENABLE);
1819		gt->ngtier = 6;
1820	} else if (GRAPHICS_VER(i915) >= 8) {
1821		for (i = 0; i < 4; i++)
1822			gt->gtier[i] =
1823				intel_uncore_read(uncore, GEN8_GT_IER(i));
1824		gt->ngtier = 4;
1825	} else if (HAS_PCH_SPLIT(i915)) {
1826		gt->gtier[0] = intel_uncore_read(uncore, GTIER);
1827		gt->ngtier = 1;
1828	}
1829
1830	gt->eir = intel_uncore_read(uncore, EIR);
1831	gt->pgtbl_er = intel_uncore_read(uncore, PGTBL_ER);
1832}
1833
1834/*
1835 * Capture all registers that relate to workload submission.
1836 * NOTE: In GuC submission, when GuC resets an engine, it can dump these for us
1837 */
1838static void gt_record_global_regs(struct intel_gt_coredump *gt)
1839{
1840	struct intel_uncore *uncore = gt->_gt->uncore;
1841	struct drm_i915_private *i915 = uncore->i915;
1842	int i;
1843
1844	/*
1845	 * General organization
1846	 * 1. Registers specific to a single generation
1847	 * 2. Registers which belong to multiple generations
1848	 * 3. Feature specific registers.
1849	 * 4. Everything else
1850	 * Please try to follow the order.
1851	 */
1852
1853	/* 1: Registers specific to a single generation */
1854	if (IS_VALLEYVIEW(i915))
1855		gt->forcewake = intel_uncore_read_fw(uncore, FORCEWAKE_VLV);
1856
1857	if (GRAPHICS_VER(i915) == 7)
1858		gt->err_int = intel_uncore_read(uncore, GEN7_ERR_INT);
1859
1860	if (GRAPHICS_VER_FULL(i915) >= IP_VER(12, 55)) {
1861		gt->fault_data0 = intel_gt_mcr_read_any((struct intel_gt *)gt->_gt,
1862							XEHP_FAULT_TLB_DATA0);
1863		gt->fault_data1 = intel_gt_mcr_read_any((struct intel_gt *)gt->_gt,
1864							XEHP_FAULT_TLB_DATA1);
1865	} else if (GRAPHICS_VER(i915) >= 12) {
1866		gt->fault_data0 = intel_uncore_read(uncore,
1867						    GEN12_FAULT_TLB_DATA0);
1868		gt->fault_data1 = intel_uncore_read(uncore,
1869						    GEN12_FAULT_TLB_DATA1);
1870	} else if (GRAPHICS_VER(i915) >= 8) {
1871		gt->fault_data0 = intel_uncore_read(uncore,
1872						    GEN8_FAULT_TLB_DATA0);
1873		gt->fault_data1 = intel_uncore_read(uncore,
1874						    GEN8_FAULT_TLB_DATA1);
1875	}
1876
1877	if (GRAPHICS_VER(i915) == 6) {
1878		gt->forcewake = intel_uncore_read_fw(uncore, FORCEWAKE);
1879		gt->gab_ctl = intel_uncore_read(uncore, GAB_CTL);
1880		gt->gfx_mode = intel_uncore_read(uncore, GFX_MODE);
1881	}
1882
1883	/* 2: Registers which belong to multiple generations */
1884	if (GRAPHICS_VER(i915) >= 7)
1885		gt->forcewake = intel_uncore_read_fw(uncore, FORCEWAKE_MT);
1886
1887	if (GRAPHICS_VER(i915) >= 6) {
1888		if (GRAPHICS_VER(i915) < 12) {
1889			gt->error = intel_uncore_read(uncore, ERROR_GEN6);
1890			gt->done_reg = intel_uncore_read(uncore, DONE_REG);
1891		}
1892	}
1893
1894	/* 3: Feature specific registers */
1895	if (IS_GRAPHICS_VER(i915, 6, 7)) {
1896		gt->gam_ecochk = intel_uncore_read(uncore, GAM_ECOCHK);
1897		gt->gac_eco = intel_uncore_read(uncore, GAC_ECO_BITS);
1898	}
1899
1900	if (IS_GRAPHICS_VER(i915, 8, 11))
1901		gt->gtt_cache = intel_uncore_read(uncore, HSW_GTT_CACHE_EN);
1902
1903	if (GRAPHICS_VER(i915) == 12)
1904		gt->aux_err = intel_uncore_read(uncore, GEN12_AUX_ERR_DBG);
1905
1906	if (GRAPHICS_VER(i915) >= 12) {
1907		for (i = 0; i < I915_MAX_SFC; i++) {
1908			/*
1909			 * SFC_DONE resides in the VD forcewake domain, so it
1910			 * only exists if the corresponding VCS engine is
1911			 * present.
1912			 */
1913			if ((gt->_gt->info.sfc_mask & BIT(i)) == 0 ||
1914			    !HAS_ENGINE(gt->_gt, _VCS(i * 2)))
1915				continue;
1916
1917			gt->sfc_done[i] =
1918				intel_uncore_read(uncore, GEN12_SFC_DONE(i));
1919		}
1920
1921		gt->gam_done = intel_uncore_read(uncore, GEN12_GAM_DONE);
 
 
 
1922	}
1923}
1924
1925static void gt_record_info(struct intel_gt_coredump *gt)
1926{
1927	memcpy(&gt->info, &gt->_gt->info, sizeof(struct intel_gt_info));
1928	gt->clock_frequency = gt->_gt->clock_frequency;
1929	gt->clock_period_ns = gt->_gt->clock_period_ns;
1930}
1931
1932/*
1933 * Generate a semi-unique error code. The code is not meant to have meaning, The
1934 * code's only purpose is to try to prevent false duplicated bug reports by
1935 * grossly estimating a GPU error state.
1936 *
1937 * TODO Ideally, hashing the batchbuffer would be a very nice way to determine
1938 * the hang if we could strip the GTT offset information from it.
1939 *
1940 * It's only a small step better than a random number in its current form.
1941 */
1942static u32 generate_ecode(const struct intel_engine_coredump *ee)
1943{
1944	/*
1945	 * IPEHR would be an ideal way to detect errors, as it's the gross
1946	 * measure of "the command that hung." However, has some very common
1947	 * synchronization commands which almost always appear in the case
1948	 * strictly a client bug. Use instdone to differentiate those some.
1949	 */
1950	return ee ? ee->ipehr ^ ee->instdone.instdone : 0;
1951}
1952
1953static const char *error_msg(struct i915_gpu_coredump *error)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1954{
1955	struct intel_engine_coredump *first = NULL;
1956	unsigned int hung_classes = 0;
1957	struct intel_gt_coredump *gt;
1958	int len;
1959
1960	for (gt = error->gt; gt; gt = gt->next) {
1961		struct intel_engine_coredump *cs;
1962
1963		for (cs = gt->engine; cs; cs = cs->next) {
1964			if (cs->hung) {
1965				hung_classes |= BIT(cs->engine->uabi_class);
1966				if (!first)
1967					first = cs;
1968			}
1969		}
1970	}
1971
1972	len = scnprintf(error->error_msg, sizeof(error->error_msg),
1973			"GPU HANG: ecode %d:%x:%08x",
1974			GRAPHICS_VER(error->i915), hung_classes,
1975			generate_ecode(first));
1976	if (first && first->context.pid) {
1977		/* Just show the first executing process, more is confusing */
1978		len += scnprintf(error->error_msg + len,
1979				 sizeof(error->error_msg) - len,
1980				 ", in %s [%d]",
1981				 first->context.comm, first->context.pid);
1982	}
1983
1984	return error->error_msg;
 
 
 
1985}
1986
1987static void capture_gen(struct i915_gpu_coredump *error)
1988{
1989	struct drm_i915_private *i915 = error->i915;
1990
 
1991	error->wakelock = atomic_read(&i915->runtime_pm.wakeref_count);
1992	error->suspended = pm_runtime_suspended(i915->drm.dev);
1993
1994	error->iommu = i915_vtd_active(i915);
 
 
 
1995	error->reset_count = i915_reset_count(&i915->gpu_error);
1996	error->suspend_count = i915->suspend_count;
1997
1998	i915_params_copy(&error->params, &i915->params);
1999	memcpy(&error->device_info,
2000	       INTEL_INFO(i915),
2001	       sizeof(error->device_info));
2002	memcpy(&error->runtime_info,
2003	       RUNTIME_INFO(i915),
2004	       sizeof(error->runtime_info));
2005	error->driver_caps = i915->caps;
2006}
2007
2008struct i915_gpu_coredump *
2009i915_gpu_coredump_alloc(struct drm_i915_private *i915, gfp_t gfp)
2010{
2011	struct i915_gpu_coredump *error;
2012
2013	if (!i915->params.error_capture)
2014		return NULL;
2015
2016	error = kzalloc(sizeof(*error), gfp);
2017	if (!error)
2018		return NULL;
2019
2020	kref_init(&error->ref);
2021	error->i915 = i915;
2022
2023	error->time = ktime_get_real();
2024	error->boottime = ktime_get_boottime();
2025	error->uptime = ktime_sub(ktime_get(), to_gt(i915)->last_init_time);
2026	error->capture = jiffies;
2027
2028	capture_gen(error);
2029
2030	return error;
2031}
2032
2033#define DAY_AS_SECONDS(x) (24 * 60 * 60 * (x))
2034
2035struct intel_gt_coredump *
2036intel_gt_coredump_alloc(struct intel_gt *gt, gfp_t gfp, u32 dump_flags)
2037{
2038	struct intel_gt_coredump *gc;
2039
2040	gc = kzalloc(sizeof(*gc), gfp);
2041	if (!gc)
2042		return NULL;
2043
2044	gc->_gt = gt;
2045	gc->awake = intel_gt_pm_is_awake(gt);
2046
2047	gt_record_display_regs(gc);
2048	gt_record_global_nonguc_regs(gc);
2049
2050	/*
2051	 * GuC dumps global, eng-class and eng-instance registers
2052	 * (that can change as part of engine state during execution)
2053	 * before an engine is reset due to a hung context.
2054	 * GuC captures and reports all three groups of registers
2055	 * together as a single set before the engine is reset.
2056	 * Thus, if GuC triggered the context reset we retrieve
2057	 * the register values as part of gt_record_engines.
2058	 */
2059	if (!(dump_flags & CORE_DUMP_FLAG_IS_GUC_CAPTURE))
2060		gt_record_global_regs(gc);
2061
2062	gt_record_fences(gc);
2063
2064	return gc;
2065}
2066
2067struct i915_vma_compress *
2068i915_vma_capture_prepare(struct intel_gt_coredump *gt)
2069{
2070	struct i915_vma_compress *compress;
2071
2072	compress = kmalloc(sizeof(*compress), ALLOW_FAIL);
2073	if (!compress)
2074		return NULL;
2075
2076	if (!compress_init(compress)) {
2077		kfree(compress);
2078		return NULL;
2079	}
2080
2081	return compress;
2082}
 
 
 
 
 
 
2083
2084void i915_vma_capture_finish(struct intel_gt_coredump *gt,
2085			     struct i915_vma_compress *compress)
2086{
2087	if (!compress)
2088		return;
2089
2090	compress_fini(compress);
2091	kfree(compress);
2092}
2093
2094static struct i915_gpu_coredump *
2095__i915_gpu_coredump(struct intel_gt *gt, intel_engine_mask_t engine_mask, u32 dump_flags)
2096{
2097	struct drm_i915_private *i915 = gt->i915;
2098	struct intel_display *display = &i915->display;
2099	struct i915_gpu_coredump *error;
2100
2101	/* Check if GPU capture has been disabled */
2102	error = READ_ONCE(i915->gpu_error.first_error);
2103	if (IS_ERR(error))
2104		return error;
2105
2106	error = i915_gpu_coredump_alloc(i915, ALLOW_FAIL);
2107	if (!error)
2108		return ERR_PTR(-ENOMEM);
2109
2110	error->gt = intel_gt_coredump_alloc(gt, ALLOW_FAIL, dump_flags);
2111	if (error->gt) {
2112		struct i915_vma_compress *compress;
2113
2114		compress = i915_vma_capture_prepare(error->gt);
2115		if (!compress) {
2116			kfree(error->gt);
2117			kfree(error);
2118			return ERR_PTR(-ENOMEM);
2119		}
2120
2121		if (INTEL_INFO(i915)->has_gt_uc) {
2122			error->gt->uc = gt_record_uc(error->gt, compress);
2123			if (error->gt->uc) {
2124				if (dump_flags & CORE_DUMP_FLAG_IS_GUC_CAPTURE)
2125					error->gt->uc->guc.is_guc_capture = true;
2126				else
2127					GEM_BUG_ON(error->gt->uc->guc.is_guc_capture);
2128			}
2129		}
2130
2131		gt_record_info(error->gt);
2132		gt_record_engines(error->gt, engine_mask, compress, dump_flags);
2133
2134
2135		i915_vma_capture_finish(error->gt, compress);
2136
2137		error->simulated |= error->gt->simulated;
2138	}
2139
2140	error->display_snapshot = intel_display_snapshot_capture(display);
2141
2142	return error;
2143}
2144
2145static struct i915_gpu_coredump *
2146i915_gpu_coredump(struct intel_gt *gt, intel_engine_mask_t engine_mask, u32 dump_flags)
2147{
2148	static DEFINE_MUTEX(capture_mutex);
2149	int ret = mutex_lock_interruptible(&capture_mutex);
2150	struct i915_gpu_coredump *dump;
2151
2152	if (ret)
2153		return ERR_PTR(ret);
2154
2155	dump = __i915_gpu_coredump(gt, engine_mask, dump_flags);
2156	mutex_unlock(&capture_mutex);
2157
2158	return dump;
2159}
2160
2161void i915_error_state_store(struct i915_gpu_coredump *error)
2162{
2163	struct drm_i915_private *i915;
2164	static bool warned;
2165
2166	if (IS_ERR_OR_NULL(error))
2167		return;
2168
2169	i915 = error->i915;
2170	drm_info(&i915->drm, "%s\n", error_msg(error));
2171
2172	if (error->simulated ||
2173	    cmpxchg(&i915->gpu_error.first_error, NULL, error))
2174		return;
2175
2176	i915_gpu_coredump_get(error);
2177
2178	if (!xchg(&warned, true) &&
2179	    ktime_get_real_seconds() - DRIVER_TIMESTAMP < DAY_AS_SECONDS(180)) {
2180		pr_info("GPU hangs can indicate a bug anywhere in the entire gfx stack, including userspace.\n");
2181		pr_info("Please file a _new_ bug report at https://gitlab.freedesktop.org/drm/intel/issues/new.\n");
2182		pr_info("Please see https://drm.pages.freedesktop.org/intel-docs/how-to-file-i915-bugs.html for details.\n");
2183		pr_info("drm/i915 developers can then reassign to the right component if it's not a kernel issue.\n");
2184		pr_info("The GPU crash dump is required to analyze GPU hangs, so please always attach it.\n");
2185		pr_info("GPU crash dump saved to /sys/class/drm/card%d/error\n",
2186			i915->drm.primary->index);
2187	}
2188}
2189
2190/**
2191 * i915_capture_error_state - capture an error record for later analysis
2192 * @gt: intel_gt which originated the hang
2193 * @engine_mask: hung engines
2194 * @dump_flags: dump flags
2195 *
2196 * Should be called when an error is detected (either a hang or an error
2197 * interrupt) to capture error state from the time of the error.  Fills
2198 * out a structure which becomes available in debugfs for user level tools
2199 * to pick up.
2200 */
2201void i915_capture_error_state(struct intel_gt *gt,
2202			      intel_engine_mask_t engine_mask, u32 dump_flags)
2203{
2204	struct i915_gpu_coredump *error;
2205
2206	error = i915_gpu_coredump(gt, engine_mask, dump_flags);
2207	if (IS_ERR(error)) {
2208		cmpxchg(&gt->i915->gpu_error.first_error, NULL, error);
2209		return;
2210	}
2211
2212	i915_error_state_store(error);
2213	i915_gpu_coredump_put(error);
2214}
2215
2216static struct i915_gpu_coredump *
2217i915_first_error_state(struct drm_i915_private *i915)
2218{
2219	struct i915_gpu_coredump *error;
2220
2221	spin_lock_irq(&i915->gpu_error.lock);
2222	error = i915->gpu_error.first_error;
2223	if (!IS_ERR_OR_NULL(error))
2224		i915_gpu_coredump_get(error);
2225	spin_unlock_irq(&i915->gpu_error.lock);
2226
2227	return error;
2228}
2229
2230void i915_reset_error_state(struct drm_i915_private *i915)
2231{
2232	struct i915_gpu_coredump *error;
2233
2234	spin_lock_irq(&i915->gpu_error.lock);
2235	error = i915->gpu_error.first_error;
2236	if (error != ERR_PTR(-ENODEV)) /* if disabled, always disabled */
2237		i915->gpu_error.first_error = NULL;
2238	spin_unlock_irq(&i915->gpu_error.lock);
2239
2240	if (!IS_ERR_OR_NULL(error))
2241		i915_gpu_coredump_put(error);
2242}
2243
2244void i915_disable_error_state(struct drm_i915_private *i915, int err)
2245{
2246	spin_lock_irq(&i915->gpu_error.lock);
2247	if (!i915->gpu_error.first_error)
2248		i915->gpu_error.first_error = ERR_PTR(err);
2249	spin_unlock_irq(&i915->gpu_error.lock);
2250}
2251
2252#if IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM)
2253void intel_klog_error_capture(struct intel_gt *gt,
2254			      intel_engine_mask_t engine_mask)
2255{
2256	static int g_count;
2257	struct drm_i915_private *i915 = gt->i915;
2258	struct i915_gpu_coredump *error;
2259	intel_wakeref_t wakeref;
2260	size_t buf_size = PAGE_SIZE * 128;
2261	size_t pos_err;
2262	char *buf, *ptr, *next;
2263	int l_count = g_count++;
2264	int line = 0;
2265
2266	/* Can't allocate memory during a reset */
2267	if (test_bit(I915_RESET_BACKOFF, &gt->reset.flags)) {
2268		drm_err(&gt->i915->drm, "[Capture/%d.%d] Inside GT reset, skipping error capture :(\n",
2269			l_count, line++);
2270		return;
2271	}
2272
2273	error = READ_ONCE(i915->gpu_error.first_error);
2274	if (error) {
2275		drm_err(&i915->drm, "[Capture/%d.%d] Clearing existing error capture first...\n",
2276			l_count, line++);
2277		i915_reset_error_state(i915);
2278	}
2279
2280	with_intel_runtime_pm(&i915->runtime_pm, wakeref)
2281		error = i915_gpu_coredump(gt, engine_mask, CORE_DUMP_FLAG_NONE);
2282
2283	if (IS_ERR(error)) {
2284		drm_err(&i915->drm, "[Capture/%d.%d] Failed to capture error capture: %ld!\n",
2285			l_count, line++, PTR_ERR(error));
2286		return;
2287	}
2288
2289	buf = kvmalloc(buf_size, GFP_KERNEL);
2290	if (!buf) {
2291		drm_err(&i915->drm, "[Capture/%d.%d] Failed to allocate buffer for error capture!\n",
2292			l_count, line++);
2293		i915_gpu_coredump_put(error);
2294		return;
2295	}
2296
2297	drm_info(&i915->drm, "[Capture/%d.%d] Dumping i915 error capture for %ps...\n",
2298		 l_count, line++, __builtin_return_address(0));
2299
2300	/* Largest string length safe to print via dmesg */
2301#	define MAX_CHUNK	800
2302
2303	pos_err = 0;
2304	while (1) {
2305		ssize_t got = i915_gpu_coredump_copy_to_buffer(error, buf, pos_err, buf_size - 1);
2306
2307		if (got <= 0)
2308			break;
2309
2310		buf[got] = 0;
2311		pos_err += got;
2312
2313		ptr = buf;
2314		while (got > 0) {
2315			size_t count;
2316			char tag[2];
2317
2318			next = strnchr(ptr, got, '\n');
2319			if (next) {
2320				count = next - ptr;
2321				*next = 0;
2322				tag[0] = '>';
2323				tag[1] = '<';
2324			} else {
2325				count = got;
2326				tag[0] = '}';
2327				tag[1] = '{';
2328			}
2329
2330			if (count > MAX_CHUNK) {
2331				size_t pos;
2332				char *ptr2 = ptr;
2333
2334				for (pos = MAX_CHUNK; pos < count; pos += MAX_CHUNK) {
2335					char chr = ptr[pos];
2336
2337					ptr[pos] = 0;
2338					drm_info(&i915->drm, "[Capture/%d.%d] }%s{\n",
2339						 l_count, line++, ptr2);
2340					ptr[pos] = chr;
2341					ptr2 = ptr + pos;
2342
2343					/*
2344					 * If spewing large amounts of data via a serial console,
2345					 * this can be a very slow process. So be friendly and try
2346					 * not to cause 'softlockup on CPU' problems.
2347					 */
2348					cond_resched();
2349				}
2350
2351				if (ptr2 < (ptr + count))
2352					drm_info(&i915->drm, "[Capture/%d.%d] %c%s%c\n",
2353						 l_count, line++, tag[0], ptr2, tag[1]);
2354				else if (tag[0] == '>')
2355					drm_info(&i915->drm, "[Capture/%d.%d] ><\n",
2356						 l_count, line++);
2357			} else {
2358				drm_info(&i915->drm, "[Capture/%d.%d] %c%s%c\n",
2359					 l_count, line++, tag[0], ptr, tag[1]);
2360			}
2361
2362			ptr = next;
2363			got -= count;
2364			if (next) {
2365				ptr++;
2366				got--;
2367			}
2368
2369			/* As above. */
2370			cond_resched();
2371		}
2372
2373		if (got)
2374			drm_info(&i915->drm, "[Capture/%d.%d] Got %zd bytes remaining!\n",
2375				 l_count, line++, got);
2376	}
2377
2378	kvfree(buf);
2379
2380	drm_info(&i915->drm, "[Capture/%d.%d] Dumped %zd bytes\n", l_count, line++, pos_err);
2381}
2382#endif
2383
2384static ssize_t gpu_state_read(struct file *file, char __user *ubuf,
2385			      size_t count, loff_t *pos)
2386{
2387	struct i915_gpu_coredump *error;
2388	ssize_t ret;
2389	void *buf;
2390
2391	error = file->private_data;
2392	if (!error)
2393		return 0;
2394
2395	/* Bounce buffer required because of kernfs __user API convenience. */
2396	buf = kmalloc(count, GFP_KERNEL);
2397	if (!buf)
2398		return -ENOMEM;
2399
2400	ret = i915_gpu_coredump_copy_to_buffer(error, buf, *pos, count);
2401	if (ret <= 0)
2402		goto out;
2403
2404	if (!copy_to_user(ubuf, buf, ret))
2405		*pos += ret;
2406	else
2407		ret = -EFAULT;
2408
2409out:
2410	kfree(buf);
2411	return ret;
2412}
2413
2414static int gpu_state_release(struct inode *inode, struct file *file)
2415{
2416	i915_gpu_coredump_put(file->private_data);
2417	return 0;
2418}
2419
2420static int i915_gpu_info_open(struct inode *inode, struct file *file)
2421{
2422	struct drm_i915_private *i915 = inode->i_private;
2423	struct i915_gpu_coredump *gpu;
2424	intel_wakeref_t wakeref;
2425
2426	gpu = NULL;
2427	with_intel_runtime_pm(&i915->runtime_pm, wakeref)
2428		gpu = i915_gpu_coredump(to_gt(i915), ALL_ENGINES, CORE_DUMP_FLAG_NONE);
2429
2430	if (IS_ERR(gpu))
2431		return PTR_ERR(gpu);
2432
2433	file->private_data = gpu;
2434	return 0;
2435}
2436
2437static const struct file_operations i915_gpu_info_fops = {
2438	.owner = THIS_MODULE,
2439	.open = i915_gpu_info_open,
2440	.read = gpu_state_read,
2441	.llseek = default_llseek,
2442	.release = gpu_state_release,
2443};
2444
2445static ssize_t
2446i915_error_state_write(struct file *filp,
2447		       const char __user *ubuf,
2448		       size_t cnt,
2449		       loff_t *ppos)
2450{
2451	struct i915_gpu_coredump *error = filp->private_data;
2452
2453	if (!error)
2454		return 0;
2455
2456	drm_dbg(&error->i915->drm, "Resetting error state\n");
2457	i915_reset_error_state(error->i915);
2458
2459	return cnt;
2460}
2461
2462static int i915_error_state_open(struct inode *inode, struct file *file)
2463{
2464	struct i915_gpu_coredump *error;
2465
2466	error = i915_first_error_state(inode->i_private);
2467	if (IS_ERR(error))
2468		return PTR_ERR(error);
2469
2470	file->private_data  = error;
2471	return 0;
2472}
2473
2474static const struct file_operations i915_error_state_fops = {
2475	.owner = THIS_MODULE,
2476	.open = i915_error_state_open,
2477	.read = gpu_state_read,
2478	.write = i915_error_state_write,
2479	.llseek = default_llseek,
2480	.release = gpu_state_release,
2481};
2482
2483void i915_gpu_error_debugfs_register(struct drm_i915_private *i915)
2484{
2485	struct drm_minor *minor = i915->drm.primary;
2486
2487	debugfs_create_file("i915_error_state", 0644, minor->debugfs_root, i915,
2488			    &i915_error_state_fops);
2489	debugfs_create_file("i915_gpu_info", 0644, minor->debugfs_root, i915,
2490			    &i915_gpu_info_fops);
2491}
2492
2493static ssize_t error_state_read(struct file *filp, struct kobject *kobj,
2494				struct bin_attribute *attr, char *buf,
2495				loff_t off, size_t count)
2496{
2497
2498	struct device *kdev = kobj_to_dev(kobj);
2499	struct drm_i915_private *i915 = kdev_minor_to_i915(kdev);
2500	struct i915_gpu_coredump *gpu;
2501	ssize_t ret = 0;
2502
2503	/*
2504	 * FIXME: Concurrent clients triggering resets and reading + clearing
2505	 * dumps can cause inconsistent sysfs reads when a user calls in with a
2506	 * non-zero offset to complete a prior partial read but the
2507	 * gpu_coredump has been cleared or replaced.
2508	 */
2509
2510	gpu = i915_first_error_state(i915);
2511	if (IS_ERR(gpu)) {
2512		ret = PTR_ERR(gpu);
2513	} else if (gpu) {
2514		ret = i915_gpu_coredump_copy_to_buffer(gpu, buf, off, count);
2515		i915_gpu_coredump_put(gpu);
2516	} else {
2517		const char *str = "No error state collected\n";
2518		size_t len = strlen(str);
2519
2520		if (off < len) {
2521			ret = min_t(size_t, count, len - off);
2522			memcpy(buf, str + off, ret);
2523		}
2524	}
2525
2526	return ret;
 
 
 
 
 
 
 
 
 
2527}
2528
2529static ssize_t error_state_write(struct file *file, struct kobject *kobj,
2530				 struct bin_attribute *attr, char *buf,
2531				 loff_t off, size_t count)
2532{
2533	struct device *kdev = kobj_to_dev(kobj);
2534	struct drm_i915_private *dev_priv = kdev_minor_to_i915(kdev);
2535
2536	drm_dbg(&dev_priv->drm, "Resetting error state\n");
2537	i915_reset_error_state(dev_priv);
 
 
 
2538
2539	return count;
2540}
2541
2542static const struct bin_attribute error_state_attr = {
2543	.attr.name = "error",
2544	.attr.mode = S_IRUSR | S_IWUSR,
2545	.size = 0,
2546	.read = error_state_read,
2547	.write = error_state_write,
2548};
2549
2550void i915_gpu_error_sysfs_setup(struct drm_i915_private *i915)
2551{
2552	struct device *kdev = i915->drm.primary->kdev;
2553
2554	if (sysfs_create_bin_file(&kdev->kobj, &error_state_attr))
2555		drm_err(&i915->drm, "error_state sysfs setup failed\n");
2556}
2557
2558void i915_gpu_error_sysfs_teardown(struct drm_i915_private *i915)
2559{
2560	struct device *kdev = i915->drm.primary->kdev;
 
2561
2562	sysfs_remove_bin_file(&kdev->kobj, &error_state_attr);
2563}