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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/nmi.h>
32#include <linux/pagevec.h>
33#include <linux/scatterlist.h>
34#include <linux/utsname.h>
35#include <linux/zlib.h>
36
37#include <drm/drm_print.h>
38
39#include "display/intel_atomic.h"
40#include "display/intel_overlay.h"
41
42#include "gem/i915_gem_context.h"
43
44#include "i915_drv.h"
45#include "i915_gpu_error.h"
46#include "i915_memcpy.h"
47#include "i915_scatterlist.h"
48#include "intel_csr.h"
49
50#define ALLOW_FAIL (GFP_KERNEL | __GFP_RETRY_MAYFAIL | __GFP_NOWARN)
51#define ATOMIC_MAYFAIL (GFP_ATOMIC | __GFP_NOWARN)
52
53static void __sg_set_buf(struct scatterlist *sg,
54 void *addr, unsigned int len, loff_t it)
55{
56 sg->page_link = (unsigned long)virt_to_page(addr);
57 sg->offset = offset_in_page(addr);
58 sg->length = len;
59 sg->dma_address = it;
60}
61
62static bool __i915_error_grow(struct drm_i915_error_state_buf *e, size_t len)
63{
64 if (!len)
65 return false;
66
67 if (e->bytes + len + 1 <= e->size)
68 return true;
69
70 if (e->bytes) {
71 __sg_set_buf(e->cur++, e->buf, e->bytes, e->iter);
72 e->iter += e->bytes;
73 e->buf = NULL;
74 e->bytes = 0;
75 }
76
77 if (e->cur == e->end) {
78 struct scatterlist *sgl;
79
80 sgl = (typeof(sgl))__get_free_page(ALLOW_FAIL);
81 if (!sgl) {
82 e->err = -ENOMEM;
83 return false;
84 }
85
86 if (e->cur) {
87 e->cur->offset = 0;
88 e->cur->length = 0;
89 e->cur->page_link =
90 (unsigned long)sgl | SG_CHAIN;
91 } else {
92 e->sgl = sgl;
93 }
94
95 e->cur = sgl;
96 e->end = sgl + SG_MAX_SINGLE_ALLOC - 1;
97 }
98
99 e->size = ALIGN(len + 1, SZ_64K);
100 e->buf = kmalloc(e->size, ALLOW_FAIL);
101 if (!e->buf) {
102 e->size = PAGE_ALIGN(len + 1);
103 e->buf = kmalloc(e->size, GFP_KERNEL);
104 }
105 if (!e->buf) {
106 e->err = -ENOMEM;
107 return false;
108 }
109
110 return true;
111}
112
113__printf(2, 0)
114static void i915_error_vprintf(struct drm_i915_error_state_buf *e,
115 const char *fmt, va_list args)
116{
117 va_list ap;
118 int len;
119
120 if (e->err)
121 return;
122
123 va_copy(ap, args);
124 len = vsnprintf(NULL, 0, fmt, ap);
125 va_end(ap);
126 if (len <= 0) {
127 e->err = len;
128 return;
129 }
130
131 if (!__i915_error_grow(e, len))
132 return;
133
134 GEM_BUG_ON(e->bytes >= e->size);
135 len = vscnprintf(e->buf + e->bytes, e->size - e->bytes, fmt, args);
136 if (len < 0) {
137 e->err = len;
138 return;
139 }
140 e->bytes += len;
141}
142
143static void i915_error_puts(struct drm_i915_error_state_buf *e, const char *str)
144{
145 unsigned len;
146
147 if (e->err || !str)
148 return;
149
150 len = strlen(str);
151 if (!__i915_error_grow(e, len))
152 return;
153
154 GEM_BUG_ON(e->bytes + len > e->size);
155 memcpy(e->buf + e->bytes, str, len);
156 e->bytes += len;
157}
158
159#define err_printf(e, ...) i915_error_printf(e, __VA_ARGS__)
160#define err_puts(e, s) i915_error_puts(e, s)
161
162static void __i915_printfn_error(struct drm_printer *p, struct va_format *vaf)
163{
164 i915_error_vprintf(p->arg, vaf->fmt, *vaf->va);
165}
166
167static inline struct drm_printer
168i915_error_printer(struct drm_i915_error_state_buf *e)
169{
170 struct drm_printer p = {
171 .printfn = __i915_printfn_error,
172 .arg = e,
173 };
174 return p;
175}
176
177/* single threaded page allocator with a reserved stash for emergencies */
178static void pool_fini(struct pagevec *pv)
179{
180 pagevec_release(pv);
181}
182
183static int pool_refill(struct pagevec *pv, gfp_t gfp)
184{
185 while (pagevec_space(pv)) {
186 struct page *p;
187
188 p = alloc_page(gfp);
189 if (!p)
190 return -ENOMEM;
191
192 pagevec_add(pv, p);
193 }
194
195 return 0;
196}
197
198static int pool_init(struct pagevec *pv, gfp_t gfp)
199{
200 int err;
201
202 pagevec_init(pv);
203
204 err = pool_refill(pv, gfp);
205 if (err)
206 pool_fini(pv);
207
208 return err;
209}
210
211static void *pool_alloc(struct pagevec *pv, gfp_t gfp)
212{
213 struct page *p;
214
215 p = alloc_page(gfp);
216 if (!p && pagevec_count(pv))
217 p = pv->pages[--pv->nr];
218
219 return p ? page_address(p) : NULL;
220}
221
222static void pool_free(struct pagevec *pv, void *addr)
223{
224 struct page *p = virt_to_page(addr);
225
226 if (pagevec_space(pv))
227 pagevec_add(pv, p);
228 else
229 __free_page(p);
230}
231
232#ifdef CONFIG_DRM_I915_COMPRESS_ERROR
233
234struct compress {
235 struct pagevec pool;
236 struct z_stream_s zstream;
237 void *tmp;
238};
239
240static bool compress_init(struct compress *c)
241{
242 struct z_stream_s *zstream = &c->zstream;
243
244 if (pool_init(&c->pool, ALLOW_FAIL))
245 return false;
246
247 zstream->workspace =
248 kmalloc(zlib_deflate_workspacesize(MAX_WBITS, MAX_MEM_LEVEL),
249 ALLOW_FAIL);
250 if (!zstream->workspace) {
251 pool_fini(&c->pool);
252 return false;
253 }
254
255 c->tmp = NULL;
256 if (i915_has_memcpy_from_wc())
257 c->tmp = pool_alloc(&c->pool, ALLOW_FAIL);
258
259 return true;
260}
261
262static bool compress_start(struct compress *c)
263{
264 struct z_stream_s *zstream = &c->zstream;
265 void *workspace = zstream->workspace;
266
267 memset(zstream, 0, sizeof(*zstream));
268 zstream->workspace = workspace;
269
270 return zlib_deflateInit(zstream, Z_DEFAULT_COMPRESSION) == Z_OK;
271}
272
273static void *compress_next_page(struct compress *c,
274 struct drm_i915_error_object *dst)
275{
276 void *page;
277
278 if (dst->page_count >= dst->num_pages)
279 return ERR_PTR(-ENOSPC);
280
281 page = pool_alloc(&c->pool, ALLOW_FAIL);
282 if (!page)
283 return ERR_PTR(-ENOMEM);
284
285 return dst->pages[dst->page_count++] = page;
286}
287
288static int compress_page(struct compress *c,
289 void *src,
290 struct drm_i915_error_object *dst)
291{
292 struct z_stream_s *zstream = &c->zstream;
293
294 zstream->next_in = src;
295 if (c->tmp && i915_memcpy_from_wc(c->tmp, src, PAGE_SIZE))
296 zstream->next_in = c->tmp;
297 zstream->avail_in = PAGE_SIZE;
298
299 do {
300 if (zstream->avail_out == 0) {
301 zstream->next_out = compress_next_page(c, dst);
302 if (IS_ERR(zstream->next_out))
303 return PTR_ERR(zstream->next_out);
304
305 zstream->avail_out = PAGE_SIZE;
306 }
307
308 if (zlib_deflate(zstream, Z_NO_FLUSH) != Z_OK)
309 return -EIO;
310 } while (zstream->avail_in);
311
312 /* Fallback to uncompressed if we increase size? */
313 if (0 && zstream->total_out > zstream->total_in)
314 return -E2BIG;
315
316 return 0;
317}
318
319static int compress_flush(struct compress *c,
320 struct drm_i915_error_object *dst)
321{
322 struct z_stream_s *zstream = &c->zstream;
323
324 do {
325 switch (zlib_deflate(zstream, Z_FINISH)) {
326 case Z_OK: /* more space requested */
327 zstream->next_out = compress_next_page(c, dst);
328 if (IS_ERR(zstream->next_out))
329 return PTR_ERR(zstream->next_out);
330
331 zstream->avail_out = PAGE_SIZE;
332 break;
333
334 case Z_STREAM_END:
335 goto end;
336
337 default: /* any error */
338 return -EIO;
339 }
340 } while (1);
341
342end:
343 memset(zstream->next_out, 0, zstream->avail_out);
344 dst->unused = zstream->avail_out;
345 return 0;
346}
347
348static void compress_finish(struct compress *c)
349{
350 zlib_deflateEnd(&c->zstream);
351}
352
353static void compress_fini(struct compress *c)
354{
355 kfree(c->zstream.workspace);
356 if (c->tmp)
357 pool_free(&c->pool, c->tmp);
358 pool_fini(&c->pool);
359}
360
361static void err_compression_marker(struct drm_i915_error_state_buf *m)
362{
363 err_puts(m, ":");
364}
365
366#else
367
368struct compress {
369 struct pagevec pool;
370};
371
372static bool compress_init(struct compress *c)
373{
374 return pool_init(&c->pool, ALLOW_FAIL) == 0;
375}
376
377static bool compress_start(struct compress *c)
378{
379 return true;
380}
381
382static int compress_page(struct compress *c,
383 void *src,
384 struct drm_i915_error_object *dst)
385{
386 void *ptr;
387
388 ptr = pool_alloc(&c->pool, ALLOW_FAIL);
389 if (!ptr)
390 return -ENOMEM;
391
392 if (!i915_memcpy_from_wc(ptr, src, PAGE_SIZE))
393 memcpy(ptr, src, PAGE_SIZE);
394 dst->pages[dst->page_count++] = ptr;
395
396 return 0;
397}
398
399static int compress_flush(struct compress *c,
400 struct drm_i915_error_object *dst)
401{
402 return 0;
403}
404
405static void compress_finish(struct compress *c)
406{
407}
408
409static void compress_fini(struct compress *c)
410{
411 pool_fini(&c->pool);
412}
413
414static void err_compression_marker(struct drm_i915_error_state_buf *m)
415{
416 err_puts(m, "~");
417}
418
419#endif
420
421static void error_print_instdone(struct drm_i915_error_state_buf *m,
422 const struct drm_i915_error_engine *ee)
423{
424 int slice;
425 int subslice;
426
427 err_printf(m, " INSTDONE: 0x%08x\n",
428 ee->instdone.instdone);
429
430 if (ee->engine->class != RENDER_CLASS || INTEL_GEN(m->i915) <= 3)
431 return;
432
433 err_printf(m, " SC_INSTDONE: 0x%08x\n",
434 ee->instdone.slice_common);
435
436 if (INTEL_GEN(m->i915) <= 6)
437 return;
438
439 for_each_instdone_slice_subslice(m->i915, slice, subslice)
440 err_printf(m, " SAMPLER_INSTDONE[%d][%d]: 0x%08x\n",
441 slice, subslice,
442 ee->instdone.sampler[slice][subslice]);
443
444 for_each_instdone_slice_subslice(m->i915, slice, subslice)
445 err_printf(m, " ROW_INSTDONE[%d][%d]: 0x%08x\n",
446 slice, subslice,
447 ee->instdone.row[slice][subslice]);
448}
449
450static void error_print_request(struct drm_i915_error_state_buf *m,
451 const char *prefix,
452 const struct drm_i915_error_request *erq,
453 const unsigned long epoch)
454{
455 if (!erq->seqno)
456 return;
457
458 err_printf(m, "%s pid %d, seqno %8x:%08x%s%s, prio %d, emitted %dms, start %08x, head %08x, tail %08x\n",
459 prefix, erq->pid, erq->context, erq->seqno,
460 test_bit(DMA_FENCE_FLAG_SIGNALED_BIT,
461 &erq->flags) ? "!" : "",
462 test_bit(DMA_FENCE_FLAG_ENABLE_SIGNAL_BIT,
463 &erq->flags) ? "+" : "",
464 erq->sched_attr.priority,
465 jiffies_to_msecs(erq->jiffies - epoch),
466 erq->start, erq->head, erq->tail);
467}
468
469static void error_print_context(struct drm_i915_error_state_buf *m,
470 const char *header,
471 const struct drm_i915_error_context *ctx)
472{
473 err_printf(m, "%s%s[%d] hw_id %d, prio %d, guilty %d active %d\n",
474 header, ctx->comm, ctx->pid, ctx->hw_id,
475 ctx->sched_attr.priority, ctx->guilty, ctx->active);
476}
477
478static void error_print_engine(struct drm_i915_error_state_buf *m,
479 const struct drm_i915_error_engine *ee,
480 const unsigned long epoch)
481{
482 int n;
483
484 err_printf(m, "%s command stream:\n", ee->engine->name);
485 err_printf(m, " IDLE?: %s\n", yesno(ee->idle));
486 err_printf(m, " START: 0x%08x\n", ee->start);
487 err_printf(m, " HEAD: 0x%08x [0x%08x]\n", ee->head, ee->rq_head);
488 err_printf(m, " TAIL: 0x%08x [0x%08x, 0x%08x]\n",
489 ee->tail, ee->rq_post, ee->rq_tail);
490 err_printf(m, " CTL: 0x%08x\n", ee->ctl);
491 err_printf(m, " MODE: 0x%08x\n", ee->mode);
492 err_printf(m, " HWS: 0x%08x\n", ee->hws);
493 err_printf(m, " ACTHD: 0x%08x %08x\n",
494 (u32)(ee->acthd>>32), (u32)ee->acthd);
495 err_printf(m, " IPEIR: 0x%08x\n", ee->ipeir);
496 err_printf(m, " IPEHR: 0x%08x\n", ee->ipehr);
497
498 error_print_instdone(m, ee);
499
500 if (ee->batchbuffer) {
501 u64 start = ee->batchbuffer->gtt_offset;
502 u64 end = start + ee->batchbuffer->gtt_size;
503
504 err_printf(m, " batch: [0x%08x_%08x, 0x%08x_%08x]\n",
505 upper_32_bits(start), lower_32_bits(start),
506 upper_32_bits(end), lower_32_bits(end));
507 }
508 if (INTEL_GEN(m->i915) >= 4) {
509 err_printf(m, " BBADDR: 0x%08x_%08x\n",
510 (u32)(ee->bbaddr>>32), (u32)ee->bbaddr);
511 err_printf(m, " BB_STATE: 0x%08x\n", ee->bbstate);
512 err_printf(m, " INSTPS: 0x%08x\n", ee->instps);
513 }
514 err_printf(m, " INSTPM: 0x%08x\n", ee->instpm);
515 err_printf(m, " FADDR: 0x%08x %08x\n", upper_32_bits(ee->faddr),
516 lower_32_bits(ee->faddr));
517 if (INTEL_GEN(m->i915) >= 6) {
518 err_printf(m, " RC PSMI: 0x%08x\n", ee->rc_psmi);
519 err_printf(m, " FAULT_REG: 0x%08x\n", ee->fault_reg);
520 }
521 if (HAS_PPGTT(m->i915)) {
522 err_printf(m, " GFX_MODE: 0x%08x\n", ee->vm_info.gfx_mode);
523
524 if (INTEL_GEN(m->i915) >= 8) {
525 int i;
526 for (i = 0; i < 4; i++)
527 err_printf(m, " PDP%d: 0x%016llx\n",
528 i, ee->vm_info.pdp[i]);
529 } else {
530 err_printf(m, " PP_DIR_BASE: 0x%08x\n",
531 ee->vm_info.pp_dir_base);
532 }
533 }
534 err_printf(m, " ring->head: 0x%08x\n", ee->cpu_ring_head);
535 err_printf(m, " ring->tail: 0x%08x\n", ee->cpu_ring_tail);
536 err_printf(m, " hangcheck timestamp: %dms (%lu%s)\n",
537 jiffies_to_msecs(ee->hangcheck_timestamp - epoch),
538 ee->hangcheck_timestamp,
539 ee->hangcheck_timestamp == epoch ? "; epoch" : "");
540 err_printf(m, " engine reset count: %u\n", ee->reset_count);
541
542 for (n = 0; n < ee->num_ports; n++) {
543 err_printf(m, " ELSP[%d]:", n);
544 error_print_request(m, " ", &ee->execlist[n], epoch);
545 }
546
547 error_print_context(m, " Active context: ", &ee->context);
548}
549
550void i915_error_printf(struct drm_i915_error_state_buf *e, const char *f, ...)
551{
552 va_list args;
553
554 va_start(args, f);
555 i915_error_vprintf(e, f, args);
556 va_end(args);
557}
558
559static void print_error_obj(struct drm_i915_error_state_buf *m,
560 const struct intel_engine_cs *engine,
561 const char *name,
562 const struct drm_i915_error_object *obj)
563{
564 char out[ASCII85_BUFSZ];
565 int page;
566
567 if (!obj)
568 return;
569
570 if (name) {
571 err_printf(m, "%s --- %s = 0x%08x %08x\n",
572 engine ? engine->name : "global", name,
573 upper_32_bits(obj->gtt_offset),
574 lower_32_bits(obj->gtt_offset));
575 }
576
577 err_compression_marker(m);
578 for (page = 0; page < obj->page_count; page++) {
579 int i, len;
580
581 len = PAGE_SIZE;
582 if (page == obj->page_count - 1)
583 len -= obj->unused;
584 len = ascii85_encode_len(len);
585
586 for (i = 0; i < len; i++)
587 err_puts(m, ascii85_encode(obj->pages[page][i], out));
588 }
589 err_puts(m, "\n");
590}
591
592static void err_print_capabilities(struct drm_i915_error_state_buf *m,
593 const struct intel_device_info *info,
594 const struct intel_runtime_info *runtime,
595 const struct intel_driver_caps *caps)
596{
597 struct drm_printer p = i915_error_printer(m);
598
599 intel_device_info_dump_flags(info, &p);
600 intel_driver_caps_print(caps, &p);
601 intel_device_info_dump_topology(&runtime->sseu, &p);
602}
603
604static void err_print_params(struct drm_i915_error_state_buf *m,
605 const struct i915_params *params)
606{
607 struct drm_printer p = i915_error_printer(m);
608
609 i915_params_dump(params, &p);
610}
611
612static void err_print_pciid(struct drm_i915_error_state_buf *m,
613 struct drm_i915_private *i915)
614{
615 struct pci_dev *pdev = i915->drm.pdev;
616
617 err_printf(m, "PCI ID: 0x%04x\n", pdev->device);
618 err_printf(m, "PCI Revision: 0x%02x\n", pdev->revision);
619 err_printf(m, "PCI Subsystem: %04x:%04x\n",
620 pdev->subsystem_vendor,
621 pdev->subsystem_device);
622}
623
624static void err_print_uc(struct drm_i915_error_state_buf *m,
625 const struct i915_error_uc *error_uc)
626{
627 struct drm_printer p = i915_error_printer(m);
628 const struct i915_gpu_state *error =
629 container_of(error_uc, typeof(*error), uc);
630
631 if (!error->device_info.has_gt_uc)
632 return;
633
634 intel_uc_fw_dump(&error_uc->guc_fw, &p);
635 intel_uc_fw_dump(&error_uc->huc_fw, &p);
636 print_error_obj(m, NULL, "GuC log buffer", error_uc->guc_log);
637}
638
639static void err_free_sgl(struct scatterlist *sgl)
640{
641 while (sgl) {
642 struct scatterlist *sg;
643
644 for (sg = sgl; !sg_is_chain(sg); sg++) {
645 kfree(sg_virt(sg));
646 if (sg_is_last(sg))
647 break;
648 }
649
650 sg = sg_is_last(sg) ? NULL : sg_chain_ptr(sg);
651 free_page((unsigned long)sgl);
652 sgl = sg;
653 }
654}
655
656static void __err_print_to_sgl(struct drm_i915_error_state_buf *m,
657 struct i915_gpu_state *error)
658{
659 const struct drm_i915_error_engine *ee;
660 struct timespec64 ts;
661 int i, j;
662
663 if (*error->error_msg)
664 err_printf(m, "%s\n", error->error_msg);
665 err_printf(m, "Kernel: %s %s\n",
666 init_utsname()->release,
667 init_utsname()->machine);
668 err_printf(m, "Driver: %s\n", DRIVER_DATE);
669 ts = ktime_to_timespec64(error->time);
670 err_printf(m, "Time: %lld s %ld us\n",
671 (s64)ts.tv_sec, ts.tv_nsec / NSEC_PER_USEC);
672 ts = ktime_to_timespec64(error->boottime);
673 err_printf(m, "Boottime: %lld s %ld us\n",
674 (s64)ts.tv_sec, ts.tv_nsec / NSEC_PER_USEC);
675 ts = ktime_to_timespec64(error->uptime);
676 err_printf(m, "Uptime: %lld s %ld us\n",
677 (s64)ts.tv_sec, ts.tv_nsec / NSEC_PER_USEC);
678 err_printf(m, "Epoch: %lu jiffies (%u HZ)\n", error->epoch, HZ);
679 err_printf(m, "Capture: %lu jiffies; %d ms ago, %d ms after epoch\n",
680 error->capture,
681 jiffies_to_msecs(jiffies - error->capture),
682 jiffies_to_msecs(error->capture - error->epoch));
683
684 for (ee = error->engine; ee; ee = ee->next)
685 err_printf(m, "Active process (on ring %s): %s [%d]\n",
686 ee->engine->name,
687 ee->context.comm,
688 ee->context.pid);
689
690 err_printf(m, "Reset count: %u\n", error->reset_count);
691 err_printf(m, "Suspend count: %u\n", error->suspend_count);
692 err_printf(m, "Platform: %s\n", intel_platform_name(error->device_info.platform));
693 err_printf(m, "Subplatform: 0x%x\n",
694 intel_subplatform(&error->runtime_info,
695 error->device_info.platform));
696 err_print_pciid(m, m->i915);
697
698 err_printf(m, "IOMMU enabled?: %d\n", error->iommu);
699
700 if (HAS_CSR(m->i915)) {
701 struct intel_csr *csr = &m->i915->csr;
702
703 err_printf(m, "DMC loaded: %s\n",
704 yesno(csr->dmc_payload != NULL));
705 err_printf(m, "DMC fw version: %d.%d\n",
706 CSR_VERSION_MAJOR(csr->version),
707 CSR_VERSION_MINOR(csr->version));
708 }
709
710 err_printf(m, "GT awake: %s\n", yesno(error->awake));
711 err_printf(m, "RPM wakelock: %s\n", yesno(error->wakelock));
712 err_printf(m, "PM suspended: %s\n", yesno(error->suspended));
713 err_printf(m, "EIR: 0x%08x\n", error->eir);
714 err_printf(m, "IER: 0x%08x\n", error->ier);
715 for (i = 0; i < error->ngtier; i++)
716 err_printf(m, "GTIER[%d]: 0x%08x\n", i, error->gtier[i]);
717 err_printf(m, "PGTBL_ER: 0x%08x\n", error->pgtbl_er);
718 err_printf(m, "FORCEWAKE: 0x%08x\n", error->forcewake);
719 err_printf(m, "DERRMR: 0x%08x\n", error->derrmr);
720 err_printf(m, "CCID: 0x%08x\n", error->ccid);
721
722 for (i = 0; i < error->nfence; i++)
723 err_printf(m, " fence[%d] = %08llx\n", i, error->fence[i]);
724
725 if (IS_GEN_RANGE(m->i915, 6, 11)) {
726 err_printf(m, "ERROR: 0x%08x\n", error->error);
727 err_printf(m, "DONE_REG: 0x%08x\n", error->done_reg);
728 }
729
730 if (INTEL_GEN(m->i915) >= 8)
731 err_printf(m, "FAULT_TLB_DATA: 0x%08x 0x%08x\n",
732 error->fault_data1, error->fault_data0);
733
734 if (IS_GEN(m->i915, 7))
735 err_printf(m, "ERR_INT: 0x%08x\n", error->err_int);
736
737 for (ee = error->engine; ee; ee = ee->next)
738 error_print_engine(m, ee, error->epoch);
739
740 for (ee = error->engine; ee; ee = ee->next) {
741 const struct drm_i915_error_object *obj;
742
743 obj = ee->batchbuffer;
744 if (obj) {
745 err_puts(m, ee->engine->name);
746 if (ee->context.pid)
747 err_printf(m, " (submitted by %s [%d])",
748 ee->context.comm,
749 ee->context.pid);
750 err_printf(m, " --- gtt_offset = 0x%08x %08x\n",
751 upper_32_bits(obj->gtt_offset),
752 lower_32_bits(obj->gtt_offset));
753 print_error_obj(m, ee->engine, NULL, obj);
754 }
755
756 for (j = 0; j < ee->user_bo_count; j++)
757 print_error_obj(m, ee->engine, "user", ee->user_bo[j]);
758
759 if (ee->num_requests) {
760 err_printf(m, "%s --- %d requests\n",
761 ee->engine->name,
762 ee->num_requests);
763 for (j = 0; j < ee->num_requests; j++)
764 error_print_request(m, " ",
765 &ee->requests[j],
766 error->epoch);
767 }
768
769 print_error_obj(m, ee->engine, "ringbuffer", ee->ringbuffer);
770 print_error_obj(m, ee->engine, "HW Status", ee->hws_page);
771 print_error_obj(m, ee->engine, "HW context", ee->ctx);
772 print_error_obj(m, ee->engine, "WA context", ee->wa_ctx);
773 print_error_obj(m, ee->engine,
774 "WA batchbuffer", ee->wa_batchbuffer);
775 print_error_obj(m, ee->engine,
776 "NULL context", ee->default_state);
777 }
778
779 if (error->overlay)
780 intel_overlay_print_error_state(m, error->overlay);
781
782 if (error->display)
783 intel_display_print_error_state(m, error->display);
784
785 err_print_capabilities(m, &error->device_info, &error->runtime_info,
786 &error->driver_caps);
787 err_print_params(m, &error->params);
788 err_print_uc(m, &error->uc);
789}
790
791static int err_print_to_sgl(struct i915_gpu_state *error)
792{
793 struct drm_i915_error_state_buf m;
794
795 if (IS_ERR(error))
796 return PTR_ERR(error);
797
798 if (READ_ONCE(error->sgl))
799 return 0;
800
801 memset(&m, 0, sizeof(m));
802 m.i915 = error->i915;
803
804 __err_print_to_sgl(&m, error);
805
806 if (m.buf) {
807 __sg_set_buf(m.cur++, m.buf, m.bytes, m.iter);
808 m.bytes = 0;
809 m.buf = NULL;
810 }
811 if (m.cur) {
812 GEM_BUG_ON(m.end < m.cur);
813 sg_mark_end(m.cur - 1);
814 }
815 GEM_BUG_ON(m.sgl && !m.cur);
816
817 if (m.err) {
818 err_free_sgl(m.sgl);
819 return m.err;
820 }
821
822 if (cmpxchg(&error->sgl, NULL, m.sgl))
823 err_free_sgl(m.sgl);
824
825 return 0;
826}
827
828ssize_t i915_gpu_state_copy_to_buffer(struct i915_gpu_state *error,
829 char *buf, loff_t off, size_t rem)
830{
831 struct scatterlist *sg;
832 size_t count;
833 loff_t pos;
834 int err;
835
836 if (!error || !rem)
837 return 0;
838
839 err = err_print_to_sgl(error);
840 if (err)
841 return err;
842
843 sg = READ_ONCE(error->fit);
844 if (!sg || off < sg->dma_address)
845 sg = error->sgl;
846 if (!sg)
847 return 0;
848
849 pos = sg->dma_address;
850 count = 0;
851 do {
852 size_t len, start;
853
854 if (sg_is_chain(sg)) {
855 sg = sg_chain_ptr(sg);
856 GEM_BUG_ON(sg_is_chain(sg));
857 }
858
859 len = sg->length;
860 if (pos + len <= off) {
861 pos += len;
862 continue;
863 }
864
865 start = sg->offset;
866 if (pos < off) {
867 GEM_BUG_ON(off - pos > len);
868 len -= off - pos;
869 start += off - pos;
870 pos = off;
871 }
872
873 len = min(len, rem);
874 GEM_BUG_ON(!len || len > sg->length);
875
876 memcpy(buf, page_address(sg_page(sg)) + start, len);
877
878 count += len;
879 pos += len;
880
881 buf += len;
882 rem -= len;
883 if (!rem) {
884 WRITE_ONCE(error->fit, sg);
885 break;
886 }
887 } while (!sg_is_last(sg++));
888
889 return count;
890}
891
892static void i915_error_object_free(struct drm_i915_error_object *obj)
893{
894 int page;
895
896 if (obj == NULL)
897 return;
898
899 for (page = 0; page < obj->page_count; page++)
900 free_page((unsigned long)obj->pages[page]);
901
902 kfree(obj);
903}
904
905
906static void cleanup_params(struct i915_gpu_state *error)
907{
908 i915_params_free(&error->params);
909}
910
911static void cleanup_uc_state(struct i915_gpu_state *error)
912{
913 struct i915_error_uc *error_uc = &error->uc;
914
915 kfree(error_uc->guc_fw.path);
916 kfree(error_uc->huc_fw.path);
917 i915_error_object_free(error_uc->guc_log);
918}
919
920void __i915_gpu_state_free(struct kref *error_ref)
921{
922 struct i915_gpu_state *error =
923 container_of(error_ref, typeof(*error), ref);
924 long i;
925
926 while (error->engine) {
927 struct drm_i915_error_engine *ee = error->engine;
928
929 error->engine = ee->next;
930
931 for (i = 0; i < ee->user_bo_count; i++)
932 i915_error_object_free(ee->user_bo[i]);
933 kfree(ee->user_bo);
934
935 i915_error_object_free(ee->batchbuffer);
936 i915_error_object_free(ee->wa_batchbuffer);
937 i915_error_object_free(ee->ringbuffer);
938 i915_error_object_free(ee->hws_page);
939 i915_error_object_free(ee->ctx);
940 i915_error_object_free(ee->wa_ctx);
941
942 kfree(ee->requests);
943 kfree(ee);
944 }
945
946 kfree(error->overlay);
947 kfree(error->display);
948
949 cleanup_params(error);
950 cleanup_uc_state(error);
951
952 err_free_sgl(error->sgl);
953 kfree(error);
954}
955
956static struct drm_i915_error_object *
957i915_error_object_create(struct drm_i915_private *i915,
958 struct i915_vma *vma,
959 struct compress *compress)
960{
961 struct i915_ggtt *ggtt = &i915->ggtt;
962 const u64 slot = ggtt->error_capture.start;
963 struct drm_i915_error_object *dst;
964 unsigned long num_pages;
965 struct sgt_iter iter;
966 dma_addr_t dma;
967 int ret;
968
969 might_sleep();
970
971 if (!vma || !vma->pages)
972 return NULL;
973
974 num_pages = min_t(u64, vma->size, vma->obj->base.size) >> PAGE_SHIFT;
975 num_pages = DIV_ROUND_UP(10 * num_pages, 8); /* worstcase zlib growth */
976 dst = kmalloc(sizeof(*dst) + num_pages * sizeof(u32 *), ALLOW_FAIL);
977 if (!dst)
978 return NULL;
979
980 if (!compress_start(compress)) {
981 kfree(dst);
982 return NULL;
983 }
984
985 dst->gtt_offset = vma->node.start;
986 dst->gtt_size = vma->node.size;
987 dst->num_pages = num_pages;
988 dst->page_count = 0;
989 dst->unused = 0;
990
991 ret = -EINVAL;
992 for_each_sgt_dma(dma, iter, vma->pages) {
993 void __iomem *s;
994
995 ggtt->vm.insert_page(&ggtt->vm, dma, slot, I915_CACHE_NONE, 0);
996
997 s = io_mapping_map_wc(&ggtt->iomap, slot, PAGE_SIZE);
998 ret = compress_page(compress, (void __force *)s, dst);
999 io_mapping_unmap(s);
1000 if (ret)
1001 break;
1002 }
1003
1004 if (ret || compress_flush(compress, dst)) {
1005 while (dst->page_count--)
1006 pool_free(&compress->pool, dst->pages[dst->page_count]);
1007 kfree(dst);
1008 dst = NULL;
1009 }
1010 compress_finish(compress);
1011
1012 return dst;
1013}
1014
1015/*
1016 * Generate a semi-unique error code. The code is not meant to have meaning, The
1017 * code's only purpose is to try to prevent false duplicated bug reports by
1018 * grossly estimating a GPU error state.
1019 *
1020 * TODO Ideally, hashing the batchbuffer would be a very nice way to determine
1021 * the hang if we could strip the GTT offset information from it.
1022 *
1023 * It's only a small step better than a random number in its current form.
1024 */
1025static u32 i915_error_generate_code(struct i915_gpu_state *error)
1026{
1027 const struct drm_i915_error_engine *ee = error->engine;
1028
1029 /*
1030 * IPEHR would be an ideal way to detect errors, as it's the gross
1031 * measure of "the command that hung." However, has some very common
1032 * synchronization commands which almost always appear in the case
1033 * strictly a client bug. Use instdone to differentiate those some.
1034 */
1035 return ee ? ee->ipehr ^ ee->instdone.instdone : 0;
1036}
1037
1038static void gem_record_fences(struct i915_gpu_state *error)
1039{
1040 struct drm_i915_private *dev_priv = error->i915;
1041 struct intel_uncore *uncore = &dev_priv->uncore;
1042 int i;
1043
1044 if (INTEL_GEN(dev_priv) >= 6) {
1045 for (i = 0; i < dev_priv->ggtt.num_fences; i++)
1046 error->fence[i] =
1047 intel_uncore_read64(uncore,
1048 FENCE_REG_GEN6_LO(i));
1049 } else if (INTEL_GEN(dev_priv) >= 4) {
1050 for (i = 0; i < dev_priv->ggtt.num_fences; i++)
1051 error->fence[i] =
1052 intel_uncore_read64(uncore,
1053 FENCE_REG_965_LO(i));
1054 } else {
1055 for (i = 0; i < dev_priv->ggtt.num_fences; i++)
1056 error->fence[i] =
1057 intel_uncore_read(uncore, FENCE_REG(i));
1058 }
1059 error->nfence = i;
1060}
1061
1062static void error_record_engine_registers(struct i915_gpu_state *error,
1063 struct intel_engine_cs *engine,
1064 struct drm_i915_error_engine *ee)
1065{
1066 struct drm_i915_private *dev_priv = engine->i915;
1067
1068 if (INTEL_GEN(dev_priv) >= 6) {
1069 ee->rc_psmi = ENGINE_READ(engine, RING_PSMI_CTL);
1070
1071 if (INTEL_GEN(dev_priv) >= 12)
1072 ee->fault_reg = I915_READ(GEN12_RING_FAULT_REG);
1073 else if (INTEL_GEN(dev_priv) >= 8)
1074 ee->fault_reg = I915_READ(GEN8_RING_FAULT_REG);
1075 else
1076 ee->fault_reg = GEN6_RING_FAULT_REG_READ(engine);
1077 }
1078
1079 if (INTEL_GEN(dev_priv) >= 4) {
1080 ee->faddr = ENGINE_READ(engine, RING_DMA_FADD);
1081 ee->ipeir = ENGINE_READ(engine, RING_IPEIR);
1082 ee->ipehr = ENGINE_READ(engine, RING_IPEHR);
1083 ee->instps = ENGINE_READ(engine, RING_INSTPS);
1084 ee->bbaddr = ENGINE_READ(engine, RING_BBADDR);
1085 if (INTEL_GEN(dev_priv) >= 8) {
1086 ee->faddr |= (u64)ENGINE_READ(engine, RING_DMA_FADD_UDW) << 32;
1087 ee->bbaddr |= (u64)ENGINE_READ(engine, RING_BBADDR_UDW) << 32;
1088 }
1089 ee->bbstate = ENGINE_READ(engine, RING_BBSTATE);
1090 } else {
1091 ee->faddr = ENGINE_READ(engine, DMA_FADD_I8XX);
1092 ee->ipeir = ENGINE_READ(engine, IPEIR);
1093 ee->ipehr = ENGINE_READ(engine, IPEHR);
1094 }
1095
1096 intel_engine_get_instdone(engine, &ee->instdone);
1097
1098 ee->instpm = ENGINE_READ(engine, RING_INSTPM);
1099 ee->acthd = intel_engine_get_active_head(engine);
1100 ee->start = ENGINE_READ(engine, RING_START);
1101 ee->head = ENGINE_READ(engine, RING_HEAD);
1102 ee->tail = ENGINE_READ(engine, RING_TAIL);
1103 ee->ctl = ENGINE_READ(engine, RING_CTL);
1104 if (INTEL_GEN(dev_priv) > 2)
1105 ee->mode = ENGINE_READ(engine, RING_MI_MODE);
1106
1107 if (!HWS_NEEDS_PHYSICAL(dev_priv)) {
1108 i915_reg_t mmio;
1109
1110 if (IS_GEN(dev_priv, 7)) {
1111 switch (engine->id) {
1112 default:
1113 MISSING_CASE(engine->id);
1114 /* fall through */
1115 case RCS0:
1116 mmio = RENDER_HWS_PGA_GEN7;
1117 break;
1118 case BCS0:
1119 mmio = BLT_HWS_PGA_GEN7;
1120 break;
1121 case VCS0:
1122 mmio = BSD_HWS_PGA_GEN7;
1123 break;
1124 case VECS0:
1125 mmio = VEBOX_HWS_PGA_GEN7;
1126 break;
1127 }
1128 } else if (IS_GEN(engine->i915, 6)) {
1129 mmio = RING_HWS_PGA_GEN6(engine->mmio_base);
1130 } else {
1131 /* XXX: gen8 returns to sanity */
1132 mmio = RING_HWS_PGA(engine->mmio_base);
1133 }
1134
1135 ee->hws = I915_READ(mmio);
1136 }
1137
1138 ee->idle = intel_engine_is_idle(engine);
1139 if (!ee->idle)
1140 ee->hangcheck_timestamp = engine->hangcheck.action_timestamp;
1141 ee->reset_count = i915_reset_engine_count(&dev_priv->gpu_error,
1142 engine);
1143
1144 if (HAS_PPGTT(dev_priv)) {
1145 int i;
1146
1147 ee->vm_info.gfx_mode = ENGINE_READ(engine, RING_MODE_GEN7);
1148
1149 if (IS_GEN(dev_priv, 6)) {
1150 ee->vm_info.pp_dir_base =
1151 ENGINE_READ(engine, RING_PP_DIR_BASE_READ);
1152 } else if (IS_GEN(dev_priv, 7)) {
1153 ee->vm_info.pp_dir_base =
1154 ENGINE_READ(engine, RING_PP_DIR_BASE);
1155 } else if (INTEL_GEN(dev_priv) >= 8) {
1156 u32 base = engine->mmio_base;
1157
1158 for (i = 0; i < 4; i++) {
1159 ee->vm_info.pdp[i] =
1160 I915_READ(GEN8_RING_PDP_UDW(base, i));
1161 ee->vm_info.pdp[i] <<= 32;
1162 ee->vm_info.pdp[i] |=
1163 I915_READ(GEN8_RING_PDP_LDW(base, i));
1164 }
1165 }
1166 }
1167}
1168
1169static void record_request(const struct i915_request *request,
1170 struct drm_i915_error_request *erq)
1171{
1172 const struct i915_gem_context *ctx = request->gem_context;
1173
1174 erq->flags = request->fence.flags;
1175 erq->context = request->fence.context;
1176 erq->seqno = request->fence.seqno;
1177 erq->sched_attr = request->sched.attr;
1178 erq->jiffies = request->emitted_jiffies;
1179 erq->start = i915_ggtt_offset(request->ring->vma);
1180 erq->head = request->head;
1181 erq->tail = request->tail;
1182
1183 rcu_read_lock();
1184 erq->pid = ctx->pid ? pid_nr(ctx->pid) : 0;
1185 rcu_read_unlock();
1186}
1187
1188static void engine_record_requests(struct intel_engine_cs *engine,
1189 struct i915_request *first,
1190 struct drm_i915_error_engine *ee)
1191{
1192 struct i915_request *request;
1193 int count;
1194
1195 count = 0;
1196 request = first;
1197 list_for_each_entry_from(request, &engine->active.requests, sched.link)
1198 count++;
1199 if (!count)
1200 return;
1201
1202 ee->requests = kcalloc(count, sizeof(*ee->requests), ATOMIC_MAYFAIL);
1203 if (!ee->requests)
1204 return;
1205
1206 ee->num_requests = count;
1207
1208 count = 0;
1209 request = first;
1210 list_for_each_entry_from(request,
1211 &engine->active.requests, sched.link) {
1212 if (count >= ee->num_requests) {
1213 /*
1214 * If the ring request list was changed in
1215 * between the point where the error request
1216 * list was created and dimensioned and this
1217 * point then just exit early to avoid crashes.
1218 *
1219 * We don't need to communicate that the
1220 * request list changed state during error
1221 * state capture and that the error state is
1222 * slightly incorrect as a consequence since we
1223 * are typically only interested in the request
1224 * list state at the point of error state
1225 * capture, not in any changes happening during
1226 * the capture.
1227 */
1228 break;
1229 }
1230
1231 record_request(request, &ee->requests[count++]);
1232 }
1233 ee->num_requests = count;
1234}
1235
1236static void error_record_engine_execlists(const struct intel_engine_cs *engine,
1237 struct drm_i915_error_engine *ee)
1238{
1239 const struct intel_engine_execlists * const execlists = &engine->execlists;
1240 struct i915_request * const *port = execlists->active;
1241 unsigned int n = 0;
1242
1243 while (*port)
1244 record_request(*port++, &ee->execlist[n++]);
1245
1246 ee->num_ports = n;
1247}
1248
1249static bool record_context(struct drm_i915_error_context *e,
1250 const struct i915_request *rq)
1251{
1252 const struct i915_gem_context *ctx = rq->gem_context;
1253
1254 if (ctx->pid) {
1255 struct task_struct *task;
1256
1257 rcu_read_lock();
1258 task = pid_task(ctx->pid, PIDTYPE_PID);
1259 if (task) {
1260 strcpy(e->comm, task->comm);
1261 e->pid = task->pid;
1262 }
1263 rcu_read_unlock();
1264 }
1265
1266 e->hw_id = ctx->hw_id;
1267 e->sched_attr = ctx->sched;
1268 e->guilty = atomic_read(&ctx->guilty_count);
1269 e->active = atomic_read(&ctx->active_count);
1270
1271 return i915_gem_context_no_error_capture(ctx);
1272}
1273
1274struct capture_vma {
1275 struct capture_vma *next;
1276 void **slot;
1277};
1278
1279static struct capture_vma *
1280capture_vma(struct capture_vma *next,
1281 struct i915_vma *vma,
1282 struct drm_i915_error_object **out)
1283{
1284 struct capture_vma *c;
1285
1286 *out = NULL;
1287 if (!vma)
1288 return next;
1289
1290 c = kmalloc(sizeof(*c), ATOMIC_MAYFAIL);
1291 if (!c)
1292 return next;
1293
1294 if (!i915_active_trygrab(&vma->active)) {
1295 kfree(c);
1296 return next;
1297 }
1298
1299 c->slot = (void **)out;
1300 *c->slot = i915_vma_get(vma);
1301
1302 c->next = next;
1303 return c;
1304}
1305
1306static struct capture_vma *
1307request_record_user_bo(struct i915_request *request,
1308 struct drm_i915_error_engine *ee,
1309 struct capture_vma *capture)
1310{
1311 struct i915_capture_list *c;
1312 struct drm_i915_error_object **bo;
1313 long count, max;
1314
1315 max = 0;
1316 for (c = request->capture_list; c; c = c->next)
1317 max++;
1318 if (!max)
1319 return capture;
1320
1321 bo = kmalloc_array(max, sizeof(*bo), ATOMIC_MAYFAIL);
1322 if (!bo) {
1323 /* If we can't capture everything, try to capture something. */
1324 max = min_t(long, max, PAGE_SIZE / sizeof(*bo));
1325 bo = kmalloc_array(max, sizeof(*bo), ATOMIC_MAYFAIL);
1326 }
1327 if (!bo)
1328 return capture;
1329
1330 count = 0;
1331 for (c = request->capture_list; c; c = c->next) {
1332 capture = capture_vma(capture, c->vma, &bo[count]);
1333 if (++count == max)
1334 break;
1335 }
1336
1337 ee->user_bo = bo;
1338 ee->user_bo_count = count;
1339
1340 return capture;
1341}
1342
1343static struct drm_i915_error_object *
1344capture_object(struct drm_i915_private *dev_priv,
1345 struct drm_i915_gem_object *obj,
1346 struct compress *compress)
1347{
1348 if (obj && i915_gem_object_has_pages(obj)) {
1349 struct i915_vma fake = {
1350 .node = { .start = U64_MAX, .size = obj->base.size },
1351 .size = obj->base.size,
1352 .pages = obj->mm.pages,
1353 .obj = obj,
1354 };
1355
1356 return i915_error_object_create(dev_priv, &fake, compress);
1357 } else {
1358 return NULL;
1359 }
1360}
1361
1362static void
1363gem_record_rings(struct i915_gpu_state *error, struct compress *compress)
1364{
1365 struct drm_i915_private *i915 = error->i915;
1366 struct intel_engine_cs *engine;
1367 struct drm_i915_error_engine *ee;
1368
1369 ee = kzalloc(sizeof(*ee), GFP_KERNEL);
1370 if (!ee)
1371 return;
1372
1373 for_each_uabi_engine(engine, i915) {
1374 struct capture_vma *capture = NULL;
1375 struct i915_request *request;
1376 unsigned long flags;
1377
1378 /* Refill our page pool before entering atomic section */
1379 pool_refill(&compress->pool, ALLOW_FAIL);
1380
1381 spin_lock_irqsave(&engine->active.lock, flags);
1382 request = intel_engine_find_active_request(engine);
1383 if (!request) {
1384 spin_unlock_irqrestore(&engine->active.lock, flags);
1385 continue;
1386 }
1387
1388 error->simulated |= record_context(&ee->context, request);
1389
1390 /*
1391 * We need to copy these to an anonymous buffer
1392 * as the simplest method to avoid being overwritten
1393 * by userspace.
1394 */
1395 capture = capture_vma(capture,
1396 request->batch,
1397 &ee->batchbuffer);
1398
1399 if (HAS_BROKEN_CS_TLB(i915))
1400 capture = capture_vma(capture,
1401 engine->gt->scratch,
1402 &ee->wa_batchbuffer);
1403
1404 capture = request_record_user_bo(request, ee, capture);
1405
1406 capture = capture_vma(capture,
1407 request->hw_context->state,
1408 &ee->ctx);
1409
1410 capture = capture_vma(capture,
1411 request->ring->vma,
1412 &ee->ringbuffer);
1413
1414 ee->cpu_ring_head = request->ring->head;
1415 ee->cpu_ring_tail = request->ring->tail;
1416
1417 ee->rq_head = request->head;
1418 ee->rq_post = request->postfix;
1419 ee->rq_tail = request->tail;
1420
1421 engine_record_requests(engine, request, ee);
1422 spin_unlock_irqrestore(&engine->active.lock, flags);
1423
1424 error_record_engine_registers(error, engine, ee);
1425 error_record_engine_execlists(engine, ee);
1426
1427 while (capture) {
1428 struct capture_vma *this = capture;
1429 struct i915_vma *vma = *this->slot;
1430
1431 *this->slot =
1432 i915_error_object_create(i915, vma, compress);
1433
1434 i915_active_ungrab(&vma->active);
1435 i915_vma_put(vma);
1436
1437 capture = this->next;
1438 kfree(this);
1439 }
1440
1441 ee->hws_page =
1442 i915_error_object_create(i915,
1443 engine->status_page.vma,
1444 compress);
1445
1446 ee->wa_ctx =
1447 i915_error_object_create(i915,
1448 engine->wa_ctx.vma,
1449 compress);
1450
1451 ee->default_state =
1452 capture_object(i915, engine->default_state, compress);
1453
1454 ee->engine = engine;
1455
1456 ee->next = error->engine;
1457 error->engine = ee;
1458
1459 ee = kzalloc(sizeof(*ee), GFP_KERNEL);
1460 if (!ee)
1461 return;
1462 }
1463
1464 kfree(ee);
1465}
1466
1467static void
1468capture_uc_state(struct i915_gpu_state *error, struct compress *compress)
1469{
1470 struct drm_i915_private *i915 = error->i915;
1471 struct i915_error_uc *error_uc = &error->uc;
1472 struct intel_uc *uc = &i915->gt.uc;
1473
1474 /* Capturing uC state won't be useful if there is no GuC */
1475 if (!error->device_info.has_gt_uc)
1476 return;
1477
1478 memcpy(&error_uc->guc_fw, &uc->guc.fw, sizeof(uc->guc.fw));
1479 memcpy(&error_uc->huc_fw, &uc->huc.fw, sizeof(uc->huc.fw));
1480
1481 /* Non-default firmware paths will be specified by the modparam.
1482 * As modparams are generally accesible from the userspace make
1483 * explicit copies of the firmware paths.
1484 */
1485 error_uc->guc_fw.path = kstrdup(uc->guc.fw.path, ALLOW_FAIL);
1486 error_uc->huc_fw.path = kstrdup(uc->huc.fw.path, ALLOW_FAIL);
1487 error_uc->guc_log = i915_error_object_create(i915,
1488 uc->guc.log.vma,
1489 compress);
1490}
1491
1492/* Capture all registers which don't fit into another category. */
1493static void capture_reg_state(struct i915_gpu_state *error)
1494{
1495 struct drm_i915_private *i915 = error->i915;
1496 struct intel_uncore *uncore = &i915->uncore;
1497 int i;
1498
1499 /* General organization
1500 * 1. Registers specific to a single generation
1501 * 2. Registers which belong to multiple generations
1502 * 3. Feature specific registers.
1503 * 4. Everything else
1504 * Please try to follow the order.
1505 */
1506
1507 /* 1: Registers specific to a single generation */
1508 if (IS_VALLEYVIEW(i915)) {
1509 error->gtier[0] = intel_uncore_read(uncore, GTIER);
1510 error->ier = intel_uncore_read(uncore, VLV_IER);
1511 error->forcewake = intel_uncore_read_fw(uncore, FORCEWAKE_VLV);
1512 }
1513
1514 if (IS_GEN(i915, 7))
1515 error->err_int = intel_uncore_read(uncore, GEN7_ERR_INT);
1516
1517 if (INTEL_GEN(i915) >= 12) {
1518 error->fault_data0 = intel_uncore_read(uncore,
1519 GEN12_FAULT_TLB_DATA0);
1520 error->fault_data1 = intel_uncore_read(uncore,
1521 GEN12_FAULT_TLB_DATA1);
1522 } else if (INTEL_GEN(i915) >= 8) {
1523 error->fault_data0 = intel_uncore_read(uncore,
1524 GEN8_FAULT_TLB_DATA0);
1525 error->fault_data1 = intel_uncore_read(uncore,
1526 GEN8_FAULT_TLB_DATA1);
1527 }
1528
1529 if (IS_GEN(i915, 6)) {
1530 error->forcewake = intel_uncore_read_fw(uncore, FORCEWAKE);
1531 error->gab_ctl = intel_uncore_read(uncore, GAB_CTL);
1532 error->gfx_mode = intel_uncore_read(uncore, GFX_MODE);
1533 }
1534
1535 /* 2: Registers which belong to multiple generations */
1536 if (INTEL_GEN(i915) >= 7)
1537 error->forcewake = intel_uncore_read_fw(uncore, FORCEWAKE_MT);
1538
1539 if (INTEL_GEN(i915) >= 6) {
1540 error->derrmr = intel_uncore_read(uncore, DERRMR);
1541 if (INTEL_GEN(i915) < 12) {
1542 error->error = intel_uncore_read(uncore, ERROR_GEN6);
1543 error->done_reg = intel_uncore_read(uncore, DONE_REG);
1544 }
1545 }
1546
1547 if (INTEL_GEN(i915) >= 5)
1548 error->ccid = intel_uncore_read(uncore, CCID(RENDER_RING_BASE));
1549
1550 /* 3: Feature specific registers */
1551 if (IS_GEN_RANGE(i915, 6, 7)) {
1552 error->gam_ecochk = intel_uncore_read(uncore, GAM_ECOCHK);
1553 error->gac_eco = intel_uncore_read(uncore, GAC_ECO_BITS);
1554 }
1555
1556 /* 4: Everything else */
1557 if (INTEL_GEN(i915) >= 11) {
1558 error->ier = intel_uncore_read(uncore, GEN8_DE_MISC_IER);
1559 error->gtier[0] =
1560 intel_uncore_read(uncore,
1561 GEN11_RENDER_COPY_INTR_ENABLE);
1562 error->gtier[1] =
1563 intel_uncore_read(uncore, GEN11_VCS_VECS_INTR_ENABLE);
1564 error->gtier[2] =
1565 intel_uncore_read(uncore, GEN11_GUC_SG_INTR_ENABLE);
1566 error->gtier[3] =
1567 intel_uncore_read(uncore,
1568 GEN11_GPM_WGBOXPERF_INTR_ENABLE);
1569 error->gtier[4] =
1570 intel_uncore_read(uncore,
1571 GEN11_CRYPTO_RSVD_INTR_ENABLE);
1572 error->gtier[5] =
1573 intel_uncore_read(uncore,
1574 GEN11_GUNIT_CSME_INTR_ENABLE);
1575 error->ngtier = 6;
1576 } else if (INTEL_GEN(i915) >= 8) {
1577 error->ier = intel_uncore_read(uncore, GEN8_DE_MISC_IER);
1578 for (i = 0; i < 4; i++)
1579 error->gtier[i] = intel_uncore_read(uncore,
1580 GEN8_GT_IER(i));
1581 error->ngtier = 4;
1582 } else if (HAS_PCH_SPLIT(i915)) {
1583 error->ier = intel_uncore_read(uncore, DEIER);
1584 error->gtier[0] = intel_uncore_read(uncore, GTIER);
1585 error->ngtier = 1;
1586 } else if (IS_GEN(i915, 2)) {
1587 error->ier = intel_uncore_read16(uncore, GEN2_IER);
1588 } else if (!IS_VALLEYVIEW(i915)) {
1589 error->ier = intel_uncore_read(uncore, GEN2_IER);
1590 }
1591 error->eir = intel_uncore_read(uncore, EIR);
1592 error->pgtbl_er = intel_uncore_read(uncore, PGTBL_ER);
1593}
1594
1595static const char *
1596error_msg(struct i915_gpu_state *error,
1597 intel_engine_mask_t engines, const char *msg)
1598{
1599 int len;
1600
1601 len = scnprintf(error->error_msg, sizeof(error->error_msg),
1602 "GPU HANG: ecode %d:%x:0x%08x",
1603 INTEL_GEN(error->i915), engines,
1604 i915_error_generate_code(error));
1605 if (error->engine) {
1606 /* Just show the first executing process, more is confusing */
1607 len += scnprintf(error->error_msg + len,
1608 sizeof(error->error_msg) - len,
1609 ", in %s [%d]",
1610 error->engine->context.comm,
1611 error->engine->context.pid);
1612 }
1613 if (msg)
1614 len += scnprintf(error->error_msg + len,
1615 sizeof(error->error_msg) - len,
1616 ", %s", msg);
1617
1618 return error->error_msg;
1619}
1620
1621static void capture_gen_state(struct i915_gpu_state *error)
1622{
1623 struct drm_i915_private *i915 = error->i915;
1624
1625 error->awake = i915->gt.awake;
1626 error->wakelock = atomic_read(&i915->runtime_pm.wakeref_count);
1627 error->suspended = i915->runtime_pm.suspended;
1628
1629 error->iommu = -1;
1630#ifdef CONFIG_INTEL_IOMMU
1631 error->iommu = intel_iommu_gfx_mapped;
1632#endif
1633 error->reset_count = i915_reset_count(&i915->gpu_error);
1634 error->suspend_count = i915->suspend_count;
1635
1636 memcpy(&error->device_info,
1637 INTEL_INFO(i915),
1638 sizeof(error->device_info));
1639 memcpy(&error->runtime_info,
1640 RUNTIME_INFO(i915),
1641 sizeof(error->runtime_info));
1642 error->driver_caps = i915->caps;
1643}
1644
1645static void capture_params(struct i915_gpu_state *error)
1646{
1647 i915_params_copy(&error->params, &i915_modparams);
1648}
1649
1650static unsigned long capture_find_epoch(const struct i915_gpu_state *error)
1651{
1652 const struct drm_i915_error_engine *ee;
1653 unsigned long epoch = error->capture;
1654
1655 for (ee = error->engine; ee; ee = ee->next) {
1656 if (ee->hangcheck_timestamp &&
1657 time_before(ee->hangcheck_timestamp, epoch))
1658 epoch = ee->hangcheck_timestamp;
1659 }
1660
1661 return epoch;
1662}
1663
1664static void capture_finish(struct i915_gpu_state *error)
1665{
1666 struct i915_ggtt *ggtt = &error->i915->ggtt;
1667 const u64 slot = ggtt->error_capture.start;
1668
1669 ggtt->vm.clear_range(&ggtt->vm, slot, PAGE_SIZE);
1670}
1671
1672#define DAY_AS_SECONDS(x) (24 * 60 * 60 * (x))
1673
1674struct i915_gpu_state *
1675i915_capture_gpu_state(struct drm_i915_private *i915)
1676{
1677 struct i915_gpu_state *error;
1678 struct compress compress;
1679
1680 /* Check if GPU capture has been disabled */
1681 error = READ_ONCE(i915->gpu_error.first_error);
1682 if (IS_ERR(error))
1683 return error;
1684
1685 error = kzalloc(sizeof(*error), ALLOW_FAIL);
1686 if (!error) {
1687 i915_disable_error_state(i915, -ENOMEM);
1688 return ERR_PTR(-ENOMEM);
1689 }
1690
1691 if (!compress_init(&compress)) {
1692 kfree(error);
1693 i915_disable_error_state(i915, -ENOMEM);
1694 return ERR_PTR(-ENOMEM);
1695 }
1696
1697 kref_init(&error->ref);
1698 error->i915 = i915;
1699
1700 error->time = ktime_get_real();
1701 error->boottime = ktime_get_boottime();
1702 error->uptime = ktime_sub(ktime_get(), i915->gt.last_init_time);
1703 error->capture = jiffies;
1704
1705 capture_params(error);
1706 capture_gen_state(error);
1707 capture_uc_state(error, &compress);
1708 capture_reg_state(error);
1709 gem_record_fences(error);
1710 gem_record_rings(error, &compress);
1711
1712 error->overlay = intel_overlay_capture_error_state(i915);
1713 error->display = intel_display_capture_error_state(i915);
1714
1715 error->epoch = capture_find_epoch(error);
1716
1717 capture_finish(error);
1718 compress_fini(&compress);
1719
1720 return error;
1721}
1722
1723/**
1724 * i915_capture_error_state - capture an error record for later analysis
1725 * @i915: i915 device
1726 * @engine_mask: the mask of engines triggering the hang
1727 * @msg: a message to insert into the error capture header
1728 *
1729 * Should be called when an error is detected (either a hang or an error
1730 * interrupt) to capture error state from the time of the error. Fills
1731 * out a structure which becomes available in debugfs for user level tools
1732 * to pick up.
1733 */
1734void i915_capture_error_state(struct drm_i915_private *i915,
1735 intel_engine_mask_t engine_mask,
1736 const char *msg)
1737{
1738 static bool warned;
1739 struct i915_gpu_state *error;
1740 unsigned long flags;
1741
1742 if (!i915_modparams.error_capture)
1743 return;
1744
1745 if (READ_ONCE(i915->gpu_error.first_error))
1746 return;
1747
1748 error = i915_capture_gpu_state(i915);
1749 if (IS_ERR(error))
1750 return;
1751
1752 dev_info(i915->drm.dev, "%s\n", error_msg(error, engine_mask, msg));
1753
1754 if (!error->simulated) {
1755 spin_lock_irqsave(&i915->gpu_error.lock, flags);
1756 if (!i915->gpu_error.first_error) {
1757 i915->gpu_error.first_error = error;
1758 error = NULL;
1759 }
1760 spin_unlock_irqrestore(&i915->gpu_error.lock, flags);
1761 }
1762
1763 if (error) {
1764 __i915_gpu_state_free(&error->ref);
1765 return;
1766 }
1767
1768 if (!xchg(&warned, true) &&
1769 ktime_get_real_seconds() - DRIVER_TIMESTAMP < DAY_AS_SECONDS(180)) {
1770 pr_info("GPU hangs can indicate a bug anywhere in the entire gfx stack, including userspace.\n");
1771 pr_info("Please file a _new_ bug report on bugs.freedesktop.org against DRI -> DRM/Intel\n");
1772 pr_info("drm/i915 developers can then reassign to the right component if it's not a kernel issue.\n");
1773 pr_info("The GPU crash dump is required to analyze GPU hangs, so please always attach it.\n");
1774 pr_info("GPU crash dump saved to /sys/class/drm/card%d/error\n",
1775 i915->drm.primary->index);
1776 }
1777}
1778
1779struct i915_gpu_state *
1780i915_first_error_state(struct drm_i915_private *i915)
1781{
1782 struct i915_gpu_state *error;
1783
1784 spin_lock_irq(&i915->gpu_error.lock);
1785 error = i915->gpu_error.first_error;
1786 if (!IS_ERR_OR_NULL(error))
1787 i915_gpu_state_get(error);
1788 spin_unlock_irq(&i915->gpu_error.lock);
1789
1790 return error;
1791}
1792
1793void i915_reset_error_state(struct drm_i915_private *i915)
1794{
1795 struct i915_gpu_state *error;
1796
1797 spin_lock_irq(&i915->gpu_error.lock);
1798 error = i915->gpu_error.first_error;
1799 if (error != ERR_PTR(-ENODEV)) /* if disabled, always disabled */
1800 i915->gpu_error.first_error = NULL;
1801 spin_unlock_irq(&i915->gpu_error.lock);
1802
1803 if (!IS_ERR_OR_NULL(error))
1804 i915_gpu_state_put(error);
1805}
1806
1807void i915_disable_error_state(struct drm_i915_private *i915, int err)
1808{
1809 spin_lock_irq(&i915->gpu_error.lock);
1810 if (!i915->gpu_error.first_error)
1811 i915->gpu_error.first_error = ERR_PTR(err);
1812 spin_unlock_irq(&i915->gpu_error.lock);
1813}
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_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_display_device_info_print(&error->display_device_info,
654 &error->display_runtime_info, &p);
655 intel_driver_caps_print(&error->driver_caps, &p);
656}
657
658static void err_print_params(struct drm_i915_error_state_buf *m,
659 const struct i915_params *params)
660{
661 struct drm_printer p = i915_error_printer(m);
662
663 i915_params_dump(params, &p);
664 intel_display_params_dump(m->i915, &p);
665}
666
667static void err_print_pciid(struct drm_i915_error_state_buf *m,
668 struct drm_i915_private *i915)
669{
670 struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
671
672 err_printf(m, "PCI ID: 0x%04x\n", pdev->device);
673 err_printf(m, "PCI Revision: 0x%02x\n", pdev->revision);
674 err_printf(m, "PCI Subsystem: %04x:%04x\n",
675 pdev->subsystem_vendor,
676 pdev->subsystem_device);
677}
678
679static void err_print_guc_ctb(struct drm_i915_error_state_buf *m,
680 const char *name,
681 const struct intel_ctb_coredump *ctb)
682{
683 if (!ctb->size)
684 return;
685
686 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",
687 name, ctb->raw_status, ctb->raw_head, ctb->raw_tail,
688 ctb->head, ctb->tail, ctb->desc_offset, ctb->cmds_offset, ctb->size);
689}
690
691static void err_print_uc(struct drm_i915_error_state_buf *m,
692 const struct intel_uc_coredump *error_uc)
693{
694 struct drm_printer p = i915_error_printer(m);
695
696 intel_uc_fw_dump(&error_uc->guc_fw, &p);
697 intel_uc_fw_dump(&error_uc->huc_fw, &p);
698 err_printf(m, "GuC timestamp: 0x%08x\n", error_uc->guc.timestamp);
699 intel_gpu_error_print_vma(m, NULL, error_uc->guc.vma_log);
700 err_printf(m, "GuC CTB fence: %d\n", error_uc->guc.last_fence);
701 err_print_guc_ctb(m, "Send", error_uc->guc.ctb + 0);
702 err_print_guc_ctb(m, "Recv", error_uc->guc.ctb + 1);
703 intel_gpu_error_print_vma(m, NULL, error_uc->guc.vma_ctb);
704}
705
706static void err_free_sgl(struct scatterlist *sgl)
707{
708 while (sgl) {
709 struct scatterlist *sg;
710
711 for (sg = sgl; !sg_is_chain(sg); sg++) {
712 kfree(sg_virt(sg));
713 if (sg_is_last(sg))
714 break;
715 }
716
717 sg = sg_is_last(sg) ? NULL : sg_chain_ptr(sg);
718 free_page((unsigned long)sgl);
719 sgl = sg;
720 }
721}
722
723static void err_print_gt_info(struct drm_i915_error_state_buf *m,
724 struct intel_gt_coredump *gt)
725{
726 struct drm_printer p = i915_error_printer(m);
727
728 intel_gt_info_print(>->info, &p);
729 intel_sseu_print_topology(gt->_gt->i915, >->info.sseu, &p);
730}
731
732static void err_print_gt_display(struct drm_i915_error_state_buf *m,
733 struct intel_gt_coredump *gt)
734{
735 err_printf(m, "IER: 0x%08x\n", gt->ier);
736 err_printf(m, "DERRMR: 0x%08x\n", gt->derrmr);
737}
738
739static void err_print_gt_global_nonguc(struct drm_i915_error_state_buf *m,
740 struct intel_gt_coredump *gt)
741{
742 int i;
743
744 err_printf(m, "GT awake: %s\n", str_yes_no(gt->awake));
745 err_printf(m, "CS timestamp frequency: %u Hz, %d ns\n",
746 gt->clock_frequency, gt->clock_period_ns);
747 err_printf(m, "EIR: 0x%08x\n", gt->eir);
748 err_printf(m, "PGTBL_ER: 0x%08x\n", gt->pgtbl_er);
749
750 for (i = 0; i < gt->ngtier; i++)
751 err_printf(m, "GTIER[%d]: 0x%08x\n", i, gt->gtier[i]);
752}
753
754static void err_print_gt_global(struct drm_i915_error_state_buf *m,
755 struct intel_gt_coredump *gt)
756{
757 err_printf(m, "FORCEWAKE: 0x%08x\n", gt->forcewake);
758
759 if (IS_GRAPHICS_VER(m->i915, 6, 11)) {
760 err_printf(m, "ERROR: 0x%08x\n", gt->error);
761 err_printf(m, "DONE_REG: 0x%08x\n", gt->done_reg);
762 }
763
764 if (GRAPHICS_VER(m->i915) >= 8)
765 err_printf(m, "FAULT_TLB_DATA: 0x%08x 0x%08x\n",
766 gt->fault_data1, gt->fault_data0);
767
768 if (GRAPHICS_VER(m->i915) == 7)
769 err_printf(m, "ERR_INT: 0x%08x\n", gt->err_int);
770
771 if (IS_GRAPHICS_VER(m->i915, 8, 11))
772 err_printf(m, "GTT_CACHE_EN: 0x%08x\n", gt->gtt_cache);
773
774 if (GRAPHICS_VER(m->i915) == 12)
775 err_printf(m, "AUX_ERR_DBG: 0x%08x\n", gt->aux_err);
776
777 if (GRAPHICS_VER(m->i915) >= 12) {
778 int i;
779
780 for (i = 0; i < I915_MAX_SFC; i++) {
781 /*
782 * SFC_DONE resides in the VD forcewake domain, so it
783 * only exists if the corresponding VCS engine is
784 * present.
785 */
786 if ((gt->_gt->info.sfc_mask & BIT(i)) == 0 ||
787 !HAS_ENGINE(gt->_gt, _VCS(i * 2)))
788 continue;
789
790 err_printf(m, " SFC_DONE[%d]: 0x%08x\n", i,
791 gt->sfc_done[i]);
792 }
793
794 err_printf(m, " GAM_DONE: 0x%08x\n", gt->gam_done);
795 }
796}
797
798static void err_print_gt_fences(struct drm_i915_error_state_buf *m,
799 struct intel_gt_coredump *gt)
800{
801 int i;
802
803 for (i = 0; i < gt->nfence; i++)
804 err_printf(m, " fence[%d] = %08llx\n", i, gt->fence[i]);
805}
806
807static void err_print_gt_engines(struct drm_i915_error_state_buf *m,
808 struct intel_gt_coredump *gt)
809{
810 const struct intel_engine_coredump *ee;
811
812 for (ee = gt->engine; ee; ee = ee->next) {
813 const struct i915_vma_coredump *vma;
814
815 if (gt->uc && gt->uc->guc.is_guc_capture) {
816 if (ee->guc_capture_node)
817 intel_guc_capture_print_engine_node(m, ee);
818 else
819 err_printf(m, " Missing GuC capture node for %s\n",
820 ee->engine->name);
821 } else {
822 error_print_engine(m, ee);
823 }
824
825 err_printf(m, " hung: %u\n", ee->hung);
826 err_printf(m, " engine reset count: %u\n", ee->reset_count);
827 error_print_context(m, " Active context: ", &ee->context);
828
829 for (vma = ee->vma; vma; vma = vma->next)
830 intel_gpu_error_print_vma(m, ee->engine, vma);
831 }
832
833}
834
835static void __err_print_to_sgl(struct drm_i915_error_state_buf *m,
836 struct i915_gpu_coredump *error)
837{
838 const struct intel_engine_coredump *ee;
839 struct timespec64 ts;
840
841 if (*error->error_msg)
842 err_printf(m, "%s\n", error->error_msg);
843 err_printf(m, "Kernel: %s %s\n",
844 init_utsname()->release,
845 init_utsname()->machine);
846 err_printf(m, "Driver: %s\n", DRIVER_DATE);
847 ts = ktime_to_timespec64(error->time);
848 err_printf(m, "Time: %lld s %ld us\n",
849 (s64)ts.tv_sec, ts.tv_nsec / NSEC_PER_USEC);
850 ts = ktime_to_timespec64(error->boottime);
851 err_printf(m, "Boottime: %lld s %ld us\n",
852 (s64)ts.tv_sec, ts.tv_nsec / NSEC_PER_USEC);
853 ts = ktime_to_timespec64(error->uptime);
854 err_printf(m, "Uptime: %lld s %ld us\n",
855 (s64)ts.tv_sec, ts.tv_nsec / NSEC_PER_USEC);
856 err_printf(m, "Capture: %lu jiffies; %d ms ago\n",
857 error->capture, jiffies_to_msecs(jiffies - error->capture));
858
859 for (ee = error->gt ? error->gt->engine : NULL; ee; ee = ee->next)
860 err_printf(m, "Active process (on ring %s): %s [%d]\n",
861 ee->engine->name,
862 ee->context.comm,
863 ee->context.pid);
864
865 err_printf(m, "Reset count: %u\n", error->reset_count);
866 err_printf(m, "Suspend count: %u\n", error->suspend_count);
867 err_printf(m, "Platform: %s\n", intel_platform_name(error->device_info.platform));
868 err_printf(m, "Subplatform: 0x%x\n",
869 intel_subplatform(&error->runtime_info,
870 error->device_info.platform));
871 err_print_pciid(m, m->i915);
872
873 err_printf(m, "IOMMU enabled?: %d\n", error->iommu);
874
875 intel_dmc_print_error_state(m, m->i915);
876
877 err_printf(m, "RPM wakelock: %s\n", str_yes_no(error->wakelock));
878 err_printf(m, "PM suspended: %s\n", str_yes_no(error->suspended));
879
880 if (error->gt) {
881 bool print_guc_capture = false;
882
883 if (error->gt->uc && error->gt->uc->guc.is_guc_capture)
884 print_guc_capture = true;
885
886 err_print_gt_display(m, error->gt);
887 err_print_gt_global_nonguc(m, error->gt);
888 err_print_gt_fences(m, error->gt);
889
890 /*
891 * GuC dumped global, eng-class and eng-instance registers together
892 * as part of engine state dump so we print in err_print_gt_engines
893 */
894 if (!print_guc_capture)
895 err_print_gt_global(m, error->gt);
896
897 err_print_gt_engines(m, error->gt);
898
899 if (error->gt->uc)
900 err_print_uc(m, error->gt->uc);
901
902 err_print_gt_info(m, error->gt);
903 }
904
905 if (error->overlay)
906 intel_overlay_print_error_state(m, error->overlay);
907
908 err_print_capabilities(m, error);
909 err_print_params(m, &error->params);
910}
911
912static int err_print_to_sgl(struct i915_gpu_coredump *error)
913{
914 struct drm_i915_error_state_buf m;
915
916 if (IS_ERR(error))
917 return PTR_ERR(error);
918
919 if (READ_ONCE(error->sgl))
920 return 0;
921
922 memset(&m, 0, sizeof(m));
923 m.i915 = error->i915;
924
925 __err_print_to_sgl(&m, error);
926
927 if (m.buf) {
928 __sg_set_buf(m.cur++, m.buf, m.bytes, m.iter);
929 m.bytes = 0;
930 m.buf = NULL;
931 }
932 if (m.cur) {
933 GEM_BUG_ON(m.end < m.cur);
934 sg_mark_end(m.cur - 1);
935 }
936 GEM_BUG_ON(m.sgl && !m.cur);
937
938 if (m.err) {
939 err_free_sgl(m.sgl);
940 return m.err;
941 }
942
943 if (cmpxchg(&error->sgl, NULL, m.sgl))
944 err_free_sgl(m.sgl);
945
946 return 0;
947}
948
949ssize_t i915_gpu_coredump_copy_to_buffer(struct i915_gpu_coredump *error,
950 char *buf, loff_t off, size_t rem)
951{
952 struct scatterlist *sg;
953 size_t count;
954 loff_t pos;
955 int err;
956
957 if (!error || !rem)
958 return 0;
959
960 err = err_print_to_sgl(error);
961 if (err)
962 return err;
963
964 sg = READ_ONCE(error->fit);
965 if (!sg || off < sg->dma_address)
966 sg = error->sgl;
967 if (!sg)
968 return 0;
969
970 pos = sg->dma_address;
971 count = 0;
972 do {
973 size_t len, start;
974
975 if (sg_is_chain(sg)) {
976 sg = sg_chain_ptr(sg);
977 GEM_BUG_ON(sg_is_chain(sg));
978 }
979
980 len = sg->length;
981 if (pos + len <= off) {
982 pos += len;
983 continue;
984 }
985
986 start = sg->offset;
987 if (pos < off) {
988 GEM_BUG_ON(off - pos > len);
989 len -= off - pos;
990 start += off - pos;
991 pos = off;
992 }
993
994 len = min(len, rem);
995 GEM_BUG_ON(!len || len > sg->length);
996
997 memcpy(buf, page_address(sg_page(sg)) + start, len);
998
999 count += len;
1000 pos += len;
1001
1002 buf += len;
1003 rem -= len;
1004 if (!rem) {
1005 WRITE_ONCE(error->fit, sg);
1006 break;
1007 }
1008 } while (!sg_is_last(sg++));
1009
1010 return count;
1011}
1012
1013static void i915_vma_coredump_free(struct i915_vma_coredump *vma)
1014{
1015 while (vma) {
1016 struct i915_vma_coredump *next = vma->next;
1017 struct page *page, *n;
1018
1019 list_for_each_entry_safe(page, n, &vma->page_list, lru) {
1020 list_del_init(&page->lru);
1021 __free_page(page);
1022 }
1023
1024 kfree(vma);
1025 vma = next;
1026 }
1027}
1028
1029static void cleanup_params(struct i915_gpu_coredump *error)
1030{
1031 i915_params_free(&error->params);
1032 intel_display_params_free(&error->display_params);
1033}
1034
1035static void cleanup_uc(struct intel_uc_coredump *uc)
1036{
1037 kfree(uc->guc_fw.file_selected.path);
1038 kfree(uc->huc_fw.file_selected.path);
1039 kfree(uc->guc_fw.file_wanted.path);
1040 kfree(uc->huc_fw.file_wanted.path);
1041 i915_vma_coredump_free(uc->guc.vma_log);
1042 i915_vma_coredump_free(uc->guc.vma_ctb);
1043
1044 kfree(uc);
1045}
1046
1047static void cleanup_gt(struct intel_gt_coredump *gt)
1048{
1049 while (gt->engine) {
1050 struct intel_engine_coredump *ee = gt->engine;
1051
1052 gt->engine = ee->next;
1053
1054 i915_vma_coredump_free(ee->vma);
1055 intel_guc_capture_free_node(ee);
1056 kfree(ee);
1057 }
1058
1059 if (gt->uc)
1060 cleanup_uc(gt->uc);
1061
1062 kfree(gt);
1063}
1064
1065void __i915_gpu_coredump_free(struct kref *error_ref)
1066{
1067 struct i915_gpu_coredump *error =
1068 container_of(error_ref, typeof(*error), ref);
1069
1070 while (error->gt) {
1071 struct intel_gt_coredump *gt = error->gt;
1072
1073 error->gt = gt->next;
1074 cleanup_gt(gt);
1075 }
1076
1077 kfree(error->overlay);
1078
1079 cleanup_params(error);
1080
1081 err_free_sgl(error->sgl);
1082 kfree(error);
1083}
1084
1085static struct i915_vma_coredump *
1086i915_vma_coredump_create(const struct intel_gt *gt,
1087 const struct i915_vma_resource *vma_res,
1088 struct i915_vma_compress *compress,
1089 const char *name)
1090
1091{
1092 struct i915_ggtt *ggtt = gt->ggtt;
1093 const u64 slot = ggtt->error_capture.start;
1094 struct i915_vma_coredump *dst;
1095 struct sgt_iter iter;
1096 int ret;
1097
1098 might_sleep();
1099
1100 if (!vma_res || !vma_res->bi.pages || !compress)
1101 return NULL;
1102
1103 dst = kmalloc(sizeof(*dst), ALLOW_FAIL);
1104 if (!dst)
1105 return NULL;
1106
1107 if (!compress_start(compress)) {
1108 kfree(dst);
1109 return NULL;
1110 }
1111
1112 INIT_LIST_HEAD(&dst->page_list);
1113 strcpy(dst->name, name);
1114 dst->next = NULL;
1115
1116 dst->gtt_offset = vma_res->start;
1117 dst->gtt_size = vma_res->node_size;
1118 dst->gtt_page_sizes = vma_res->page_sizes_gtt;
1119 dst->unused = 0;
1120
1121 ret = -EINVAL;
1122 if (drm_mm_node_allocated(&ggtt->error_capture)) {
1123 void __iomem *s;
1124 dma_addr_t dma;
1125
1126 for_each_sgt_daddr(dma, iter, vma_res->bi.pages) {
1127 mutex_lock(&ggtt->error_mutex);
1128 if (ggtt->vm.raw_insert_page)
1129 ggtt->vm.raw_insert_page(&ggtt->vm, dma, slot,
1130 i915_gem_get_pat_index(gt->i915,
1131 I915_CACHE_NONE),
1132 0);
1133 else
1134 ggtt->vm.insert_page(&ggtt->vm, dma, slot,
1135 i915_gem_get_pat_index(gt->i915,
1136 I915_CACHE_NONE),
1137 0);
1138 mb();
1139
1140 s = io_mapping_map_wc(&ggtt->iomap, slot, PAGE_SIZE);
1141 ret = compress_page(compress,
1142 (void __force *)s, dst,
1143 true);
1144 io_mapping_unmap(s);
1145
1146 mb();
1147 ggtt->vm.clear_range(&ggtt->vm, slot, PAGE_SIZE);
1148 mutex_unlock(&ggtt->error_mutex);
1149 if (ret)
1150 break;
1151 }
1152 } else if (vma_res->bi.lmem) {
1153 struct intel_memory_region *mem = vma_res->mr;
1154 dma_addr_t dma;
1155
1156 for_each_sgt_daddr(dma, iter, vma_res->bi.pages) {
1157 dma_addr_t offset = dma - mem->region.start;
1158 void __iomem *s;
1159
1160 if (offset + PAGE_SIZE > mem->io_size) {
1161 ret = -EINVAL;
1162 break;
1163 }
1164
1165 s = io_mapping_map_wc(&mem->iomap, offset, PAGE_SIZE);
1166 ret = compress_page(compress,
1167 (void __force *)s, dst,
1168 true);
1169 io_mapping_unmap(s);
1170 if (ret)
1171 break;
1172 }
1173 } else {
1174 struct page *page;
1175
1176 for_each_sgt_page(page, iter, vma_res->bi.pages) {
1177 void *s;
1178
1179 drm_clflush_pages(&page, 1);
1180
1181 s = kmap_local_page(page);
1182 ret = compress_page(compress, s, dst, false);
1183 kunmap_local(s);
1184
1185 drm_clflush_pages(&page, 1);
1186
1187 if (ret)
1188 break;
1189 }
1190 }
1191
1192 if (ret || compress_flush(compress, dst)) {
1193 struct page *page, *n;
1194
1195 list_for_each_entry_safe_reverse(page, n, &dst->page_list, lru) {
1196 list_del_init(&page->lru);
1197 pool_free(&compress->pool, page_address(page));
1198 }
1199
1200 kfree(dst);
1201 dst = NULL;
1202 }
1203 compress_finish(compress);
1204
1205 return dst;
1206}
1207
1208static void gt_record_fences(struct intel_gt_coredump *gt)
1209{
1210 struct i915_ggtt *ggtt = gt->_gt->ggtt;
1211 struct intel_uncore *uncore = gt->_gt->uncore;
1212 int i;
1213
1214 if (GRAPHICS_VER(uncore->i915) >= 6) {
1215 for (i = 0; i < ggtt->num_fences; i++)
1216 gt->fence[i] =
1217 intel_uncore_read64(uncore,
1218 FENCE_REG_GEN6_LO(i));
1219 } else if (GRAPHICS_VER(uncore->i915) >= 4) {
1220 for (i = 0; i < ggtt->num_fences; i++)
1221 gt->fence[i] =
1222 intel_uncore_read64(uncore,
1223 FENCE_REG_965_LO(i));
1224 } else {
1225 for (i = 0; i < ggtt->num_fences; i++)
1226 gt->fence[i] =
1227 intel_uncore_read(uncore, FENCE_REG(i));
1228 }
1229 gt->nfence = i;
1230}
1231
1232static void engine_record_registers(struct intel_engine_coredump *ee)
1233{
1234 const struct intel_engine_cs *engine = ee->engine;
1235 struct drm_i915_private *i915 = engine->i915;
1236
1237 if (GRAPHICS_VER(i915) >= 6) {
1238 ee->rc_psmi = ENGINE_READ(engine, RING_PSMI_CTL);
1239
1240 /*
1241 * For the media GT, this ring fault register is not replicated,
1242 * so don't do multicast/replicated register read/write
1243 * operation on it.
1244 */
1245 if (MEDIA_VER(i915) >= 13 && engine->gt->type == GT_MEDIA)
1246 ee->fault_reg = intel_uncore_read(engine->uncore,
1247 XELPMP_RING_FAULT_REG);
1248
1249 else if (GRAPHICS_VER_FULL(i915) >= IP_VER(12, 50))
1250 ee->fault_reg = intel_gt_mcr_read_any(engine->gt,
1251 XEHP_RING_FAULT_REG);
1252 else if (GRAPHICS_VER(i915) >= 12)
1253 ee->fault_reg = intel_uncore_read(engine->uncore,
1254 GEN12_RING_FAULT_REG);
1255 else if (GRAPHICS_VER(i915) >= 8)
1256 ee->fault_reg = intel_uncore_read(engine->uncore,
1257 GEN8_RING_FAULT_REG);
1258 else
1259 ee->fault_reg = GEN6_RING_FAULT_REG_READ(engine);
1260 }
1261
1262 if (GRAPHICS_VER(i915) >= 4) {
1263 ee->esr = ENGINE_READ(engine, RING_ESR);
1264 ee->faddr = ENGINE_READ(engine, RING_DMA_FADD);
1265 ee->ipeir = ENGINE_READ(engine, RING_IPEIR);
1266 ee->ipehr = ENGINE_READ(engine, RING_IPEHR);
1267 ee->instps = ENGINE_READ(engine, RING_INSTPS);
1268 ee->bbaddr = ENGINE_READ(engine, RING_BBADDR);
1269 ee->ccid = ENGINE_READ(engine, CCID);
1270 if (GRAPHICS_VER(i915) >= 8) {
1271 ee->faddr |= (u64)ENGINE_READ(engine, RING_DMA_FADD_UDW) << 32;
1272 ee->bbaddr |= (u64)ENGINE_READ(engine, RING_BBADDR_UDW) << 32;
1273 }
1274 ee->bbstate = ENGINE_READ(engine, RING_BBSTATE);
1275 } else {
1276 ee->faddr = ENGINE_READ(engine, DMA_FADD_I8XX);
1277 ee->ipeir = ENGINE_READ(engine, IPEIR);
1278 ee->ipehr = ENGINE_READ(engine, IPEHR);
1279 }
1280
1281 if (GRAPHICS_VER(i915) >= 11) {
1282 ee->cmd_cctl = ENGINE_READ(engine, RING_CMD_CCTL);
1283 ee->cscmdop = ENGINE_READ(engine, RING_CSCMDOP);
1284 ee->ctx_sr_ctl = ENGINE_READ(engine, RING_CTX_SR_CTL);
1285 ee->dma_faddr_hi = ENGINE_READ(engine, RING_DMA_FADD_UDW);
1286 ee->dma_faddr_lo = ENGINE_READ(engine, RING_DMA_FADD);
1287 ee->nopid = ENGINE_READ(engine, RING_NOPID);
1288 ee->excc = ENGINE_READ(engine, RING_EXCC);
1289 }
1290
1291 intel_engine_get_instdone(engine, &ee->instdone);
1292
1293 ee->instpm = ENGINE_READ(engine, RING_INSTPM);
1294 ee->acthd = intel_engine_get_active_head(engine);
1295 ee->start = ENGINE_READ(engine, RING_START);
1296 ee->head = ENGINE_READ(engine, RING_HEAD);
1297 ee->tail = ENGINE_READ(engine, RING_TAIL);
1298 ee->ctl = ENGINE_READ(engine, RING_CTL);
1299 if (GRAPHICS_VER(i915) > 2)
1300 ee->mode = ENGINE_READ(engine, RING_MI_MODE);
1301
1302 if (!HWS_NEEDS_PHYSICAL(i915)) {
1303 i915_reg_t mmio;
1304
1305 if (GRAPHICS_VER(i915) == 7) {
1306 switch (engine->id) {
1307 default:
1308 MISSING_CASE(engine->id);
1309 fallthrough;
1310 case RCS0:
1311 mmio = RENDER_HWS_PGA_GEN7;
1312 break;
1313 case BCS0:
1314 mmio = BLT_HWS_PGA_GEN7;
1315 break;
1316 case VCS0:
1317 mmio = BSD_HWS_PGA_GEN7;
1318 break;
1319 case VECS0:
1320 mmio = VEBOX_HWS_PGA_GEN7;
1321 break;
1322 }
1323 } else if (GRAPHICS_VER(engine->i915) == 6) {
1324 mmio = RING_HWS_PGA_GEN6(engine->mmio_base);
1325 } else {
1326 /* XXX: gen8 returns to sanity */
1327 mmio = RING_HWS_PGA(engine->mmio_base);
1328 }
1329
1330 ee->hws = intel_uncore_read(engine->uncore, mmio);
1331 }
1332
1333 ee->reset_count = i915_reset_engine_count(&i915->gpu_error, engine);
1334
1335 if (HAS_PPGTT(i915)) {
1336 int i;
1337
1338 ee->vm_info.gfx_mode = ENGINE_READ(engine, RING_MODE_GEN7);
1339
1340 if (GRAPHICS_VER(i915) == 6) {
1341 ee->vm_info.pp_dir_base =
1342 ENGINE_READ(engine, RING_PP_DIR_BASE_READ);
1343 } else if (GRAPHICS_VER(i915) == 7) {
1344 ee->vm_info.pp_dir_base =
1345 ENGINE_READ(engine, RING_PP_DIR_BASE);
1346 } else if (GRAPHICS_VER(i915) >= 8) {
1347 u32 base = engine->mmio_base;
1348
1349 for (i = 0; i < 4; i++) {
1350 ee->vm_info.pdp[i] =
1351 intel_uncore_read(engine->uncore,
1352 GEN8_RING_PDP_UDW(base, i));
1353 ee->vm_info.pdp[i] <<= 32;
1354 ee->vm_info.pdp[i] |=
1355 intel_uncore_read(engine->uncore,
1356 GEN8_RING_PDP_LDW(base, i));
1357 }
1358 }
1359 }
1360}
1361
1362static void record_request(const struct i915_request *request,
1363 struct i915_request_coredump *erq)
1364{
1365 erq->flags = request->fence.flags;
1366 erq->context = request->fence.context;
1367 erq->seqno = request->fence.seqno;
1368 erq->sched_attr = request->sched.attr;
1369 erq->head = request->head;
1370 erq->tail = request->tail;
1371
1372 erq->pid = 0;
1373 rcu_read_lock();
1374 if (!intel_context_is_closed(request->context)) {
1375 const struct i915_gem_context *ctx;
1376
1377 ctx = rcu_dereference(request->context->gem_context);
1378 if (ctx)
1379 erq->pid = pid_nr(ctx->pid);
1380 }
1381 rcu_read_unlock();
1382}
1383
1384static void engine_record_execlists(struct intel_engine_coredump *ee)
1385{
1386 const struct intel_engine_execlists * const el = &ee->engine->execlists;
1387 struct i915_request * const *port = el->active;
1388 unsigned int n = 0;
1389
1390 while (*port)
1391 record_request(*port++, &ee->execlist[n++]);
1392
1393 ee->num_ports = n;
1394}
1395
1396static bool record_context(struct i915_gem_context_coredump *e,
1397 struct intel_context *ce)
1398{
1399 struct i915_gem_context *ctx;
1400 struct task_struct *task;
1401 bool simulated;
1402
1403 rcu_read_lock();
1404 ctx = rcu_dereference(ce->gem_context);
1405 if (ctx && !kref_get_unless_zero(&ctx->ref))
1406 ctx = NULL;
1407 rcu_read_unlock();
1408 if (!ctx)
1409 return true;
1410
1411 rcu_read_lock();
1412 task = pid_task(ctx->pid, PIDTYPE_PID);
1413 if (task) {
1414 strcpy(e->comm, task->comm);
1415 e->pid = task->pid;
1416 }
1417 rcu_read_unlock();
1418
1419 e->sched_attr = ctx->sched;
1420 e->guilty = atomic_read(&ctx->guilty_count);
1421 e->active = atomic_read(&ctx->active_count);
1422 e->hwsp_seqno = (ce->timeline && ce->timeline->hwsp_seqno) ?
1423 *ce->timeline->hwsp_seqno : ~0U;
1424
1425 e->total_runtime = intel_context_get_total_runtime_ns(ce);
1426 e->avg_runtime = intel_context_get_avg_runtime_ns(ce);
1427
1428 simulated = i915_gem_context_no_error_capture(ctx);
1429
1430 i915_gem_context_put(ctx);
1431 return simulated;
1432}
1433
1434struct intel_engine_capture_vma {
1435 struct intel_engine_capture_vma *next;
1436 struct i915_vma_resource *vma_res;
1437 char name[16];
1438 bool lockdep_cookie;
1439};
1440
1441static struct intel_engine_capture_vma *
1442capture_vma_snapshot(struct intel_engine_capture_vma *next,
1443 struct i915_vma_resource *vma_res,
1444 gfp_t gfp, const char *name)
1445{
1446 struct intel_engine_capture_vma *c;
1447
1448 if (!vma_res)
1449 return next;
1450
1451 c = kmalloc(sizeof(*c), gfp);
1452 if (!c)
1453 return next;
1454
1455 if (!i915_vma_resource_hold(vma_res, &c->lockdep_cookie)) {
1456 kfree(c);
1457 return next;
1458 }
1459
1460 strcpy(c->name, name);
1461 c->vma_res = i915_vma_resource_get(vma_res);
1462
1463 c->next = next;
1464 return c;
1465}
1466
1467static struct intel_engine_capture_vma *
1468capture_vma(struct intel_engine_capture_vma *next,
1469 struct i915_vma *vma,
1470 const char *name,
1471 gfp_t gfp)
1472{
1473 if (!vma)
1474 return next;
1475
1476 /*
1477 * If the vma isn't pinned, then the vma should be snapshotted
1478 * to a struct i915_vma_snapshot at command submission time.
1479 * Not here.
1480 */
1481 if (GEM_WARN_ON(!i915_vma_is_pinned(vma)))
1482 return next;
1483
1484 next = capture_vma_snapshot(next, vma->resource, gfp, name);
1485
1486 return next;
1487}
1488
1489static struct intel_engine_capture_vma *
1490capture_user(struct intel_engine_capture_vma *capture,
1491 const struct i915_request *rq,
1492 gfp_t gfp)
1493{
1494 struct i915_capture_list *c;
1495
1496 for (c = rq->capture_list; c; c = c->next)
1497 capture = capture_vma_snapshot(capture, c->vma_res, gfp,
1498 "user");
1499
1500 return capture;
1501}
1502
1503static void add_vma(struct intel_engine_coredump *ee,
1504 struct i915_vma_coredump *vma)
1505{
1506 if (vma) {
1507 vma->next = ee->vma;
1508 ee->vma = vma;
1509 }
1510}
1511
1512static struct i915_vma_coredump *
1513create_vma_coredump(const struct intel_gt *gt, struct i915_vma *vma,
1514 const char *name, struct i915_vma_compress *compress)
1515{
1516 struct i915_vma_coredump *ret = NULL;
1517 struct i915_vma_resource *vma_res;
1518 bool lockdep_cookie;
1519
1520 if (!vma)
1521 return NULL;
1522
1523 vma_res = vma->resource;
1524
1525 if (i915_vma_resource_hold(vma_res, &lockdep_cookie)) {
1526 ret = i915_vma_coredump_create(gt, vma_res, compress, name);
1527 i915_vma_resource_unhold(vma_res, lockdep_cookie);
1528 }
1529
1530 return ret;
1531}
1532
1533static void add_vma_coredump(struct intel_engine_coredump *ee,
1534 const struct intel_gt *gt,
1535 struct i915_vma *vma,
1536 const char *name,
1537 struct i915_vma_compress *compress)
1538{
1539 add_vma(ee, create_vma_coredump(gt, vma, name, compress));
1540}
1541
1542struct intel_engine_coredump *
1543intel_engine_coredump_alloc(struct intel_engine_cs *engine, gfp_t gfp, u32 dump_flags)
1544{
1545 struct intel_engine_coredump *ee;
1546
1547 ee = kzalloc(sizeof(*ee), gfp);
1548 if (!ee)
1549 return NULL;
1550
1551 ee->engine = engine;
1552
1553 if (!(dump_flags & CORE_DUMP_FLAG_IS_GUC_CAPTURE)) {
1554 engine_record_registers(ee);
1555 engine_record_execlists(ee);
1556 }
1557
1558 return ee;
1559}
1560
1561static struct intel_engine_capture_vma *
1562engine_coredump_add_context(struct intel_engine_coredump *ee,
1563 struct intel_context *ce,
1564 gfp_t gfp)
1565{
1566 struct intel_engine_capture_vma *vma = NULL;
1567
1568 ee->simulated |= record_context(&ee->context, ce);
1569 if (ee->simulated)
1570 return NULL;
1571
1572 /*
1573 * We need to copy these to an anonymous buffer
1574 * as the simplest method to avoid being overwritten
1575 * by userspace.
1576 */
1577 vma = capture_vma(vma, ce->ring->vma, "ring", gfp);
1578 vma = capture_vma(vma, ce->state, "HW context", gfp);
1579
1580 return vma;
1581}
1582
1583struct intel_engine_capture_vma *
1584intel_engine_coredump_add_request(struct intel_engine_coredump *ee,
1585 struct i915_request *rq,
1586 gfp_t gfp)
1587{
1588 struct intel_engine_capture_vma *vma;
1589
1590 vma = engine_coredump_add_context(ee, rq->context, gfp);
1591 if (!vma)
1592 return NULL;
1593
1594 /*
1595 * We need to copy these to an anonymous buffer
1596 * as the simplest method to avoid being overwritten
1597 * by userspace.
1598 */
1599 vma = capture_vma_snapshot(vma, rq->batch_res, gfp, "batch");
1600 vma = capture_user(vma, rq, gfp);
1601
1602 ee->rq_head = rq->head;
1603 ee->rq_post = rq->postfix;
1604 ee->rq_tail = rq->tail;
1605
1606 return vma;
1607}
1608
1609void
1610intel_engine_coredump_add_vma(struct intel_engine_coredump *ee,
1611 struct intel_engine_capture_vma *capture,
1612 struct i915_vma_compress *compress)
1613{
1614 const struct intel_engine_cs *engine = ee->engine;
1615
1616 while (capture) {
1617 struct intel_engine_capture_vma *this = capture;
1618 struct i915_vma_resource *vma_res = this->vma_res;
1619
1620 add_vma(ee,
1621 i915_vma_coredump_create(engine->gt, vma_res,
1622 compress, this->name));
1623
1624 i915_vma_resource_unhold(vma_res, this->lockdep_cookie);
1625 i915_vma_resource_put(vma_res);
1626
1627 capture = this->next;
1628 kfree(this);
1629 }
1630
1631 add_vma_coredump(ee, engine->gt, engine->status_page.vma,
1632 "HW Status", compress);
1633
1634 add_vma_coredump(ee, engine->gt, engine->wa_ctx.vma,
1635 "WA context", compress);
1636}
1637
1638static struct intel_engine_coredump *
1639capture_engine(struct intel_engine_cs *engine,
1640 struct i915_vma_compress *compress,
1641 u32 dump_flags)
1642{
1643 struct intel_engine_capture_vma *capture = NULL;
1644 struct intel_engine_coredump *ee;
1645 struct intel_context *ce = NULL;
1646 struct i915_request *rq = NULL;
1647
1648 ee = intel_engine_coredump_alloc(engine, ALLOW_FAIL, dump_flags);
1649 if (!ee)
1650 return NULL;
1651
1652 intel_engine_get_hung_entity(engine, &ce, &rq);
1653 if (rq && !i915_request_started(rq))
1654 drm_info(&engine->gt->i915->drm, "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
1657 if (rq) {
1658 capture = intel_engine_coredump_add_request(ee, rq, ATOMIC_MAYFAIL);
1659 i915_request_put(rq);
1660 } else if (ce) {
1661 capture = engine_coredump_add_context(ee, ce, ATOMIC_MAYFAIL);
1662 }
1663
1664 if (capture) {
1665 intel_engine_coredump_add_vma(ee, capture, compress);
1666
1667 if (dump_flags & CORE_DUMP_FLAG_IS_GUC_CAPTURE)
1668 intel_guc_capture_get_matching_node(engine->gt, ee, ce);
1669 } else {
1670 kfree(ee);
1671 ee = NULL;
1672 }
1673
1674 return ee;
1675}
1676
1677static void
1678gt_record_engines(struct intel_gt_coredump *gt,
1679 intel_engine_mask_t engine_mask,
1680 struct i915_vma_compress *compress,
1681 u32 dump_flags)
1682{
1683 struct intel_engine_cs *engine;
1684 enum intel_engine_id id;
1685
1686 for_each_engine(engine, gt->_gt, id) {
1687 struct intel_engine_coredump *ee;
1688
1689 /* Refill our page pool before entering atomic section */
1690 pool_refill(&compress->pool, ALLOW_FAIL);
1691
1692 ee = capture_engine(engine, compress, dump_flags);
1693 if (!ee)
1694 continue;
1695
1696 ee->hung = engine->mask & engine_mask;
1697
1698 gt->simulated |= ee->simulated;
1699 if (ee->simulated) {
1700 if (dump_flags & CORE_DUMP_FLAG_IS_GUC_CAPTURE)
1701 intel_guc_capture_free_node(ee);
1702 kfree(ee);
1703 continue;
1704 }
1705
1706 ee->next = gt->engine;
1707 gt->engine = ee;
1708 }
1709}
1710
1711static void gt_record_guc_ctb(struct intel_ctb_coredump *saved,
1712 const struct intel_guc_ct_buffer *ctb,
1713 const void *blob_ptr, struct intel_guc *guc)
1714{
1715 if (!ctb || !ctb->desc)
1716 return;
1717
1718 saved->raw_status = ctb->desc->status;
1719 saved->raw_head = ctb->desc->head;
1720 saved->raw_tail = ctb->desc->tail;
1721 saved->head = ctb->head;
1722 saved->tail = ctb->tail;
1723 saved->size = ctb->size;
1724 saved->desc_offset = ((void *)ctb->desc) - blob_ptr;
1725 saved->cmds_offset = ((void *)ctb->cmds) - blob_ptr;
1726}
1727
1728static struct intel_uc_coredump *
1729gt_record_uc(struct intel_gt_coredump *gt,
1730 struct i915_vma_compress *compress)
1731{
1732 const struct intel_uc *uc = >->_gt->uc;
1733 struct intel_uc_coredump *error_uc;
1734
1735 error_uc = kzalloc(sizeof(*error_uc), ALLOW_FAIL);
1736 if (!error_uc)
1737 return NULL;
1738
1739 memcpy(&error_uc->guc_fw, &uc->guc.fw, sizeof(uc->guc.fw));
1740 memcpy(&error_uc->huc_fw, &uc->huc.fw, sizeof(uc->huc.fw));
1741
1742 error_uc->guc_fw.file_selected.path = kstrdup(uc->guc.fw.file_selected.path, ALLOW_FAIL);
1743 error_uc->huc_fw.file_selected.path = kstrdup(uc->huc.fw.file_selected.path, ALLOW_FAIL);
1744 error_uc->guc_fw.file_wanted.path = kstrdup(uc->guc.fw.file_wanted.path, ALLOW_FAIL);
1745 error_uc->huc_fw.file_wanted.path = kstrdup(uc->huc.fw.file_wanted.path, ALLOW_FAIL);
1746
1747 /*
1748 * Save the GuC log and include a timestamp reference for converting the
1749 * log times to system times (in conjunction with the error->boottime and
1750 * gt->clock_frequency fields saved elsewhere).
1751 */
1752 error_uc->guc.timestamp = intel_uncore_read(gt->_gt->uncore, GUCPMTIMESTAMP);
1753 error_uc->guc.vma_log = create_vma_coredump(gt->_gt, uc->guc.log.vma,
1754 "GuC log buffer", compress);
1755 error_uc->guc.vma_ctb = create_vma_coredump(gt->_gt, uc->guc.ct.vma,
1756 "GuC CT buffer", compress);
1757 error_uc->guc.last_fence = uc->guc.ct.requests.last_fence;
1758 gt_record_guc_ctb(error_uc->guc.ctb + 0, &uc->guc.ct.ctbs.send,
1759 uc->guc.ct.ctbs.send.desc, (struct intel_guc *)&uc->guc);
1760 gt_record_guc_ctb(error_uc->guc.ctb + 1, &uc->guc.ct.ctbs.recv,
1761 uc->guc.ct.ctbs.send.desc, (struct intel_guc *)&uc->guc);
1762
1763 return error_uc;
1764}
1765
1766/* Capture display registers. */
1767static void gt_record_display_regs(struct intel_gt_coredump *gt)
1768{
1769 struct intel_uncore *uncore = gt->_gt->uncore;
1770 struct drm_i915_private *i915 = uncore->i915;
1771
1772 if (DISPLAY_VER(i915) >= 6 && DISPLAY_VER(i915) < 20)
1773 gt->derrmr = intel_uncore_read(uncore, DERRMR);
1774
1775 if (GRAPHICS_VER(i915) >= 8)
1776 gt->ier = intel_uncore_read(uncore, GEN8_DE_MISC_IER);
1777 else if (IS_VALLEYVIEW(i915))
1778 gt->ier = intel_uncore_read(uncore, VLV_IER);
1779 else if (HAS_PCH_SPLIT(i915))
1780 gt->ier = intel_uncore_read(uncore, DEIER);
1781 else if (GRAPHICS_VER(i915) == 2)
1782 gt->ier = intel_uncore_read16(uncore, GEN2_IER);
1783 else
1784 gt->ier = intel_uncore_read(uncore, GEN2_IER);
1785}
1786
1787/* Capture all other registers that GuC doesn't capture. */
1788static void gt_record_global_nonguc_regs(struct intel_gt_coredump *gt)
1789{
1790 struct intel_uncore *uncore = gt->_gt->uncore;
1791 struct drm_i915_private *i915 = uncore->i915;
1792 int i;
1793
1794 if (IS_VALLEYVIEW(i915)) {
1795 gt->gtier[0] = intel_uncore_read(uncore, GTIER);
1796 gt->ngtier = 1;
1797 } else if (GRAPHICS_VER(i915) >= 11) {
1798 gt->gtier[0] =
1799 intel_uncore_read(uncore,
1800 GEN11_RENDER_COPY_INTR_ENABLE);
1801 gt->gtier[1] =
1802 intel_uncore_read(uncore, GEN11_VCS_VECS_INTR_ENABLE);
1803 gt->gtier[2] =
1804 intel_uncore_read(uncore, GEN11_GUC_SG_INTR_ENABLE);
1805 gt->gtier[3] =
1806 intel_uncore_read(uncore,
1807 GEN11_GPM_WGBOXPERF_INTR_ENABLE);
1808 gt->gtier[4] =
1809 intel_uncore_read(uncore,
1810 GEN11_CRYPTO_RSVD_INTR_ENABLE);
1811 gt->gtier[5] =
1812 intel_uncore_read(uncore,
1813 GEN11_GUNIT_CSME_INTR_ENABLE);
1814 gt->ngtier = 6;
1815 } else if (GRAPHICS_VER(i915) >= 8) {
1816 for (i = 0; i < 4; i++)
1817 gt->gtier[i] =
1818 intel_uncore_read(uncore, GEN8_GT_IER(i));
1819 gt->ngtier = 4;
1820 } else if (HAS_PCH_SPLIT(i915)) {
1821 gt->gtier[0] = intel_uncore_read(uncore, GTIER);
1822 gt->ngtier = 1;
1823 }
1824
1825 gt->eir = intel_uncore_read(uncore, EIR);
1826 gt->pgtbl_er = intel_uncore_read(uncore, PGTBL_ER);
1827}
1828
1829/*
1830 * Capture all registers that relate to workload submission.
1831 * NOTE: In GuC submission, when GuC resets an engine, it can dump these for us
1832 */
1833static void gt_record_global_regs(struct intel_gt_coredump *gt)
1834{
1835 struct intel_uncore *uncore = gt->_gt->uncore;
1836 struct drm_i915_private *i915 = uncore->i915;
1837 int i;
1838
1839 /*
1840 * General organization
1841 * 1. Registers specific to a single generation
1842 * 2. Registers which belong to multiple generations
1843 * 3. Feature specific registers.
1844 * 4. Everything else
1845 * Please try to follow the order.
1846 */
1847
1848 /* 1: Registers specific to a single generation */
1849 if (IS_VALLEYVIEW(i915))
1850 gt->forcewake = intel_uncore_read_fw(uncore, FORCEWAKE_VLV);
1851
1852 if (GRAPHICS_VER(i915) == 7)
1853 gt->err_int = intel_uncore_read(uncore, GEN7_ERR_INT);
1854
1855 if (GRAPHICS_VER_FULL(i915) >= IP_VER(12, 50)) {
1856 gt->fault_data0 = intel_gt_mcr_read_any((struct intel_gt *)gt->_gt,
1857 XEHP_FAULT_TLB_DATA0);
1858 gt->fault_data1 = intel_gt_mcr_read_any((struct intel_gt *)gt->_gt,
1859 XEHP_FAULT_TLB_DATA1);
1860 } else if (GRAPHICS_VER(i915) >= 12) {
1861 gt->fault_data0 = intel_uncore_read(uncore,
1862 GEN12_FAULT_TLB_DATA0);
1863 gt->fault_data1 = intel_uncore_read(uncore,
1864 GEN12_FAULT_TLB_DATA1);
1865 } else if (GRAPHICS_VER(i915) >= 8) {
1866 gt->fault_data0 = intel_uncore_read(uncore,
1867 GEN8_FAULT_TLB_DATA0);
1868 gt->fault_data1 = intel_uncore_read(uncore,
1869 GEN8_FAULT_TLB_DATA1);
1870 }
1871
1872 if (GRAPHICS_VER(i915) == 6) {
1873 gt->forcewake = intel_uncore_read_fw(uncore, FORCEWAKE);
1874 gt->gab_ctl = intel_uncore_read(uncore, GAB_CTL);
1875 gt->gfx_mode = intel_uncore_read(uncore, GFX_MODE);
1876 }
1877
1878 /* 2: Registers which belong to multiple generations */
1879 if (GRAPHICS_VER(i915) >= 7)
1880 gt->forcewake = intel_uncore_read_fw(uncore, FORCEWAKE_MT);
1881
1882 if (GRAPHICS_VER(i915) >= 6) {
1883 if (GRAPHICS_VER(i915) < 12) {
1884 gt->error = intel_uncore_read(uncore, ERROR_GEN6);
1885 gt->done_reg = intel_uncore_read(uncore, DONE_REG);
1886 }
1887 }
1888
1889 /* 3: Feature specific registers */
1890 if (IS_GRAPHICS_VER(i915, 6, 7)) {
1891 gt->gam_ecochk = intel_uncore_read(uncore, GAM_ECOCHK);
1892 gt->gac_eco = intel_uncore_read(uncore, GAC_ECO_BITS);
1893 }
1894
1895 if (IS_GRAPHICS_VER(i915, 8, 11))
1896 gt->gtt_cache = intel_uncore_read(uncore, HSW_GTT_CACHE_EN);
1897
1898 if (GRAPHICS_VER(i915) == 12)
1899 gt->aux_err = intel_uncore_read(uncore, GEN12_AUX_ERR_DBG);
1900
1901 if (GRAPHICS_VER(i915) >= 12) {
1902 for (i = 0; i < I915_MAX_SFC; i++) {
1903 /*
1904 * SFC_DONE resides in the VD forcewake domain, so it
1905 * only exists if the corresponding VCS engine is
1906 * present.
1907 */
1908 if ((gt->_gt->info.sfc_mask & BIT(i)) == 0 ||
1909 !HAS_ENGINE(gt->_gt, _VCS(i * 2)))
1910 continue;
1911
1912 gt->sfc_done[i] =
1913 intel_uncore_read(uncore, GEN12_SFC_DONE(i));
1914 }
1915
1916 gt->gam_done = intel_uncore_read(uncore, GEN12_GAM_DONE);
1917 }
1918}
1919
1920static void gt_record_info(struct intel_gt_coredump *gt)
1921{
1922 memcpy(>->info, >->_gt->info, sizeof(struct intel_gt_info));
1923 gt->clock_frequency = gt->_gt->clock_frequency;
1924 gt->clock_period_ns = gt->_gt->clock_period_ns;
1925}
1926
1927/*
1928 * Generate a semi-unique error code. The code is not meant to have meaning, The
1929 * code's only purpose is to try to prevent false duplicated bug reports by
1930 * grossly estimating a GPU error state.
1931 *
1932 * TODO Ideally, hashing the batchbuffer would be a very nice way to determine
1933 * the hang if we could strip the GTT offset information from it.
1934 *
1935 * It's only a small step better than a random number in its current form.
1936 */
1937static u32 generate_ecode(const struct intel_engine_coredump *ee)
1938{
1939 /*
1940 * IPEHR would be an ideal way to detect errors, as it's the gross
1941 * measure of "the command that hung." However, has some very common
1942 * synchronization commands which almost always appear in the case
1943 * strictly a client bug. Use instdone to differentiate those some.
1944 */
1945 return ee ? ee->ipehr ^ ee->instdone.instdone : 0;
1946}
1947
1948static const char *error_msg(struct i915_gpu_coredump *error)
1949{
1950 struct intel_engine_coredump *first = NULL;
1951 unsigned int hung_classes = 0;
1952 struct intel_gt_coredump *gt;
1953 int len;
1954
1955 for (gt = error->gt; gt; gt = gt->next) {
1956 struct intel_engine_coredump *cs;
1957
1958 for (cs = gt->engine; cs; cs = cs->next) {
1959 if (cs->hung) {
1960 hung_classes |= BIT(cs->engine->uabi_class);
1961 if (!first)
1962 first = cs;
1963 }
1964 }
1965 }
1966
1967 len = scnprintf(error->error_msg, sizeof(error->error_msg),
1968 "GPU HANG: ecode %d:%x:%08x",
1969 GRAPHICS_VER(error->i915), hung_classes,
1970 generate_ecode(first));
1971 if (first && first->context.pid) {
1972 /* Just show the first executing process, more is confusing */
1973 len += scnprintf(error->error_msg + len,
1974 sizeof(error->error_msg) - len,
1975 ", in %s [%d]",
1976 first->context.comm, first->context.pid);
1977 }
1978
1979 return error->error_msg;
1980}
1981
1982static void capture_gen(struct i915_gpu_coredump *error)
1983{
1984 struct drm_i915_private *i915 = error->i915;
1985
1986 error->wakelock = atomic_read(&i915->runtime_pm.wakeref_count);
1987 error->suspended = pm_runtime_suspended(i915->drm.dev);
1988
1989 error->iommu = i915_vtd_active(i915);
1990 error->reset_count = i915_reset_count(&i915->gpu_error);
1991 error->suspend_count = i915->suspend_count;
1992
1993 i915_params_copy(&error->params, &i915->params);
1994 intel_display_params_copy(&error->display_params);
1995 memcpy(&error->device_info,
1996 INTEL_INFO(i915),
1997 sizeof(error->device_info));
1998 memcpy(&error->runtime_info,
1999 RUNTIME_INFO(i915),
2000 sizeof(error->runtime_info));
2001 memcpy(&error->display_device_info, DISPLAY_INFO(i915),
2002 sizeof(error->display_device_info));
2003 memcpy(&error->display_runtime_info, DISPLAY_RUNTIME_INFO(i915),
2004 sizeof(error->display_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 i915_gpu_coredump *error;
2099
2100 /* Check if GPU capture has been disabled */
2101 error = READ_ONCE(i915->gpu_error.first_error);
2102 if (IS_ERR(error))
2103 return error;
2104
2105 error = i915_gpu_coredump_alloc(i915, ALLOW_FAIL);
2106 if (!error)
2107 return ERR_PTR(-ENOMEM);
2108
2109 error->gt = intel_gt_coredump_alloc(gt, ALLOW_FAIL, dump_flags);
2110 if (error->gt) {
2111 struct i915_vma_compress *compress;
2112
2113 compress = i915_vma_capture_prepare(error->gt);
2114 if (!compress) {
2115 kfree(error->gt);
2116 kfree(error);
2117 return ERR_PTR(-ENOMEM);
2118 }
2119
2120 if (INTEL_INFO(i915)->has_gt_uc) {
2121 error->gt->uc = gt_record_uc(error->gt, compress);
2122 if (error->gt->uc) {
2123 if (dump_flags & CORE_DUMP_FLAG_IS_GUC_CAPTURE)
2124 error->gt->uc->guc.is_guc_capture = true;
2125 else
2126 GEM_BUG_ON(error->gt->uc->guc.is_guc_capture);
2127 }
2128 }
2129
2130 gt_record_info(error->gt);
2131 gt_record_engines(error->gt, engine_mask, compress, dump_flags);
2132
2133
2134 i915_vma_capture_finish(error->gt, compress);
2135
2136 error->simulated |= error->gt->simulated;
2137 }
2138
2139 error->overlay = intel_overlay_capture_error_state(i915);
2140
2141 return error;
2142}
2143
2144static struct i915_gpu_coredump *
2145i915_gpu_coredump(struct intel_gt *gt, intel_engine_mask_t engine_mask, u32 dump_flags)
2146{
2147 static DEFINE_MUTEX(capture_mutex);
2148 int ret = mutex_lock_interruptible(&capture_mutex);
2149 struct i915_gpu_coredump *dump;
2150
2151 if (ret)
2152 return ERR_PTR(ret);
2153
2154 dump = __i915_gpu_coredump(gt, engine_mask, dump_flags);
2155 mutex_unlock(&capture_mutex);
2156
2157 return dump;
2158}
2159
2160void i915_error_state_store(struct i915_gpu_coredump *error)
2161{
2162 struct drm_i915_private *i915;
2163 static bool warned;
2164
2165 if (IS_ERR_OR_NULL(error))
2166 return;
2167
2168 i915 = error->i915;
2169 drm_info(&i915->drm, "%s\n", error_msg(error));
2170
2171 if (error->simulated ||
2172 cmpxchg(&i915->gpu_error.first_error, NULL, error))
2173 return;
2174
2175 i915_gpu_coredump_get(error);
2176
2177 if (!xchg(&warned, true) &&
2178 ktime_get_real_seconds() - DRIVER_TIMESTAMP < DAY_AS_SECONDS(180)) {
2179 pr_info("GPU hangs can indicate a bug anywhere in the entire gfx stack, including userspace.\n");
2180 pr_info("Please file a _new_ bug report at https://gitlab.freedesktop.org/drm/intel/issues/new.\n");
2181 pr_info("Please see https://drm.pages.freedesktop.org/intel-docs/how-to-file-i915-bugs.html for details.\n");
2182 pr_info("drm/i915 developers can then reassign to the right component if it's not a kernel issue.\n");
2183 pr_info("The GPU crash dump is required to analyze GPU hangs, so please always attach it.\n");
2184 pr_info("GPU crash dump saved to /sys/class/drm/card%d/error\n",
2185 i915->drm.primary->index);
2186 }
2187}
2188
2189/**
2190 * i915_capture_error_state - capture an error record for later analysis
2191 * @gt: intel_gt which originated the hang
2192 * @engine_mask: hung engines
2193 * @dump_flags: dump flags
2194 *
2195 * Should be called when an error is detected (either a hang or an error
2196 * interrupt) to capture error state from the time of the error. Fills
2197 * out a structure which becomes available in debugfs for user level tools
2198 * to pick up.
2199 */
2200void i915_capture_error_state(struct intel_gt *gt,
2201 intel_engine_mask_t engine_mask, u32 dump_flags)
2202{
2203 struct i915_gpu_coredump *error;
2204
2205 error = i915_gpu_coredump(gt, engine_mask, dump_flags);
2206 if (IS_ERR(error)) {
2207 cmpxchg(>->i915->gpu_error.first_error, NULL, error);
2208 return;
2209 }
2210
2211 i915_error_state_store(error);
2212 i915_gpu_coredump_put(error);
2213}
2214
2215static struct i915_gpu_coredump *
2216i915_first_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 (!IS_ERR_OR_NULL(error))
2223 i915_gpu_coredump_get(error);
2224 spin_unlock_irq(&i915->gpu_error.lock);
2225
2226 return error;
2227}
2228
2229void i915_reset_error_state(struct drm_i915_private *i915)
2230{
2231 struct i915_gpu_coredump *error;
2232
2233 spin_lock_irq(&i915->gpu_error.lock);
2234 error = i915->gpu_error.first_error;
2235 if (error != ERR_PTR(-ENODEV)) /* if disabled, always disabled */
2236 i915->gpu_error.first_error = NULL;
2237 spin_unlock_irq(&i915->gpu_error.lock);
2238
2239 if (!IS_ERR_OR_NULL(error))
2240 i915_gpu_coredump_put(error);
2241}
2242
2243void i915_disable_error_state(struct drm_i915_private *i915, int err)
2244{
2245 spin_lock_irq(&i915->gpu_error.lock);
2246 if (!i915->gpu_error.first_error)
2247 i915->gpu_error.first_error = ERR_PTR(err);
2248 spin_unlock_irq(&i915->gpu_error.lock);
2249}
2250
2251#if IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM)
2252void intel_klog_error_capture(struct intel_gt *gt,
2253 intel_engine_mask_t engine_mask)
2254{
2255 static int g_count;
2256 struct drm_i915_private *i915 = gt->i915;
2257 struct i915_gpu_coredump *error;
2258 intel_wakeref_t wakeref;
2259 size_t buf_size = PAGE_SIZE * 128;
2260 size_t pos_err;
2261 char *buf, *ptr, *next;
2262 int l_count = g_count++;
2263 int line = 0;
2264
2265 /* Can't allocate memory during a reset */
2266 if (test_bit(I915_RESET_BACKOFF, >->reset.flags)) {
2267 drm_err(>->i915->drm, "[Capture/%d.%d] Inside GT reset, skipping error capture :(\n",
2268 l_count, line++);
2269 return;
2270 }
2271
2272 error = READ_ONCE(i915->gpu_error.first_error);
2273 if (error) {
2274 drm_err(&i915->drm, "[Capture/%d.%d] Clearing existing error capture first...\n",
2275 l_count, line++);
2276 i915_reset_error_state(i915);
2277 }
2278
2279 with_intel_runtime_pm(&i915->runtime_pm, wakeref)
2280 error = i915_gpu_coredump(gt, engine_mask, CORE_DUMP_FLAG_NONE);
2281
2282 if (IS_ERR(error)) {
2283 drm_err(&i915->drm, "[Capture/%d.%d] Failed to capture error capture: %ld!\n",
2284 l_count, line++, PTR_ERR(error));
2285 return;
2286 }
2287
2288 buf = kvmalloc(buf_size, GFP_KERNEL);
2289 if (!buf) {
2290 drm_err(&i915->drm, "[Capture/%d.%d] Failed to allocate buffer for error capture!\n",
2291 l_count, line++);
2292 i915_gpu_coredump_put(error);
2293 return;
2294 }
2295
2296 drm_info(&i915->drm, "[Capture/%d.%d] Dumping i915 error capture for %ps...\n",
2297 l_count, line++, __builtin_return_address(0));
2298
2299 /* Largest string length safe to print via dmesg */
2300# define MAX_CHUNK 800
2301
2302 pos_err = 0;
2303 while (1) {
2304 ssize_t got = i915_gpu_coredump_copy_to_buffer(error, buf, pos_err, buf_size - 1);
2305
2306 if (got <= 0)
2307 break;
2308
2309 buf[got] = 0;
2310 pos_err += got;
2311
2312 ptr = buf;
2313 while (got > 0) {
2314 size_t count;
2315 char tag[2];
2316
2317 next = strnchr(ptr, got, '\n');
2318 if (next) {
2319 count = next - ptr;
2320 *next = 0;
2321 tag[0] = '>';
2322 tag[1] = '<';
2323 } else {
2324 count = got;
2325 tag[0] = '}';
2326 tag[1] = '{';
2327 }
2328
2329 if (count > MAX_CHUNK) {
2330 size_t pos;
2331 char *ptr2 = ptr;
2332
2333 for (pos = MAX_CHUNK; pos < count; pos += MAX_CHUNK) {
2334 char chr = ptr[pos];
2335
2336 ptr[pos] = 0;
2337 drm_info(&i915->drm, "[Capture/%d.%d] }%s{\n",
2338 l_count, line++, ptr2);
2339 ptr[pos] = chr;
2340 ptr2 = ptr + pos;
2341
2342 /*
2343 * If spewing large amounts of data via a serial console,
2344 * this can be a very slow process. So be friendly and try
2345 * not to cause 'softlockup on CPU' problems.
2346 */
2347 cond_resched();
2348 }
2349
2350 if (ptr2 < (ptr + count))
2351 drm_info(&i915->drm, "[Capture/%d.%d] %c%s%c\n",
2352 l_count, line++, tag[0], ptr2, tag[1]);
2353 else if (tag[0] == '>')
2354 drm_info(&i915->drm, "[Capture/%d.%d] ><\n",
2355 l_count, line++);
2356 } else {
2357 drm_info(&i915->drm, "[Capture/%d.%d] %c%s%c\n",
2358 l_count, line++, tag[0], ptr, tag[1]);
2359 }
2360
2361 ptr = next;
2362 got -= count;
2363 if (next) {
2364 ptr++;
2365 got--;
2366 }
2367
2368 /* As above. */
2369 cond_resched();
2370 }
2371
2372 if (got)
2373 drm_info(&i915->drm, "[Capture/%d.%d] Got %zd bytes remaining!\n",
2374 l_count, line++, got);
2375 }
2376
2377 kvfree(buf);
2378
2379 drm_info(&i915->drm, "[Capture/%d.%d] Dumped %zd bytes\n", l_count, line++, pos_err);
2380}
2381#endif
2382
2383static ssize_t gpu_state_read(struct file *file, char __user *ubuf,
2384 size_t count, loff_t *pos)
2385{
2386 struct i915_gpu_coredump *error;
2387 ssize_t ret;
2388 void *buf;
2389
2390 error = file->private_data;
2391 if (!error)
2392 return 0;
2393
2394 /* Bounce buffer required because of kernfs __user API convenience. */
2395 buf = kmalloc(count, GFP_KERNEL);
2396 if (!buf)
2397 return -ENOMEM;
2398
2399 ret = i915_gpu_coredump_copy_to_buffer(error, buf, *pos, count);
2400 if (ret <= 0)
2401 goto out;
2402
2403 if (!copy_to_user(ubuf, buf, ret))
2404 *pos += ret;
2405 else
2406 ret = -EFAULT;
2407
2408out:
2409 kfree(buf);
2410 return ret;
2411}
2412
2413static int gpu_state_release(struct inode *inode, struct file *file)
2414{
2415 i915_gpu_coredump_put(file->private_data);
2416 return 0;
2417}
2418
2419static int i915_gpu_info_open(struct inode *inode, struct file *file)
2420{
2421 struct drm_i915_private *i915 = inode->i_private;
2422 struct i915_gpu_coredump *gpu;
2423 intel_wakeref_t wakeref;
2424
2425 gpu = NULL;
2426 with_intel_runtime_pm(&i915->runtime_pm, wakeref)
2427 gpu = i915_gpu_coredump(to_gt(i915), ALL_ENGINES, CORE_DUMP_FLAG_NONE);
2428
2429 if (IS_ERR(gpu))
2430 return PTR_ERR(gpu);
2431
2432 file->private_data = gpu;
2433 return 0;
2434}
2435
2436static const struct file_operations i915_gpu_info_fops = {
2437 .owner = THIS_MODULE,
2438 .open = i915_gpu_info_open,
2439 .read = gpu_state_read,
2440 .llseek = default_llseek,
2441 .release = gpu_state_release,
2442};
2443
2444static ssize_t
2445i915_error_state_write(struct file *filp,
2446 const char __user *ubuf,
2447 size_t cnt,
2448 loff_t *ppos)
2449{
2450 struct i915_gpu_coredump *error = filp->private_data;
2451
2452 if (!error)
2453 return 0;
2454
2455 drm_dbg(&error->i915->drm, "Resetting error state\n");
2456 i915_reset_error_state(error->i915);
2457
2458 return cnt;
2459}
2460
2461static int i915_error_state_open(struct inode *inode, struct file *file)
2462{
2463 struct i915_gpu_coredump *error;
2464
2465 error = i915_first_error_state(inode->i_private);
2466 if (IS_ERR(error))
2467 return PTR_ERR(error);
2468
2469 file->private_data = error;
2470 return 0;
2471}
2472
2473static const struct file_operations i915_error_state_fops = {
2474 .owner = THIS_MODULE,
2475 .open = i915_error_state_open,
2476 .read = gpu_state_read,
2477 .write = i915_error_state_write,
2478 .llseek = default_llseek,
2479 .release = gpu_state_release,
2480};
2481
2482void i915_gpu_error_debugfs_register(struct drm_i915_private *i915)
2483{
2484 struct drm_minor *minor = i915->drm.primary;
2485
2486 debugfs_create_file("i915_error_state", 0644, minor->debugfs_root, i915,
2487 &i915_error_state_fops);
2488 debugfs_create_file("i915_gpu_info", 0644, minor->debugfs_root, i915,
2489 &i915_gpu_info_fops);
2490}
2491
2492static ssize_t error_state_read(struct file *filp, struct kobject *kobj,
2493 struct bin_attribute *attr, char *buf,
2494 loff_t off, size_t count)
2495{
2496
2497 struct device *kdev = kobj_to_dev(kobj);
2498 struct drm_i915_private *i915 = kdev_minor_to_i915(kdev);
2499 struct i915_gpu_coredump *gpu;
2500 ssize_t ret = 0;
2501
2502 /*
2503 * FIXME: Concurrent clients triggering resets and reading + clearing
2504 * dumps can cause inconsistent sysfs reads when a user calls in with a
2505 * non-zero offset to complete a prior partial read but the
2506 * gpu_coredump has been cleared or replaced.
2507 */
2508
2509 gpu = i915_first_error_state(i915);
2510 if (IS_ERR(gpu)) {
2511 ret = PTR_ERR(gpu);
2512 } else if (gpu) {
2513 ret = i915_gpu_coredump_copy_to_buffer(gpu, buf, off, count);
2514 i915_gpu_coredump_put(gpu);
2515 } else {
2516 const char *str = "No error state collected\n";
2517 size_t len = strlen(str);
2518
2519 if (off < len) {
2520 ret = min_t(size_t, count, len - off);
2521 memcpy(buf, str + off, ret);
2522 }
2523 }
2524
2525 return ret;
2526}
2527
2528static ssize_t error_state_write(struct file *file, struct kobject *kobj,
2529 struct bin_attribute *attr, char *buf,
2530 loff_t off, size_t count)
2531{
2532 struct device *kdev = kobj_to_dev(kobj);
2533 struct drm_i915_private *dev_priv = kdev_minor_to_i915(kdev);
2534
2535 drm_dbg(&dev_priv->drm, "Resetting error state\n");
2536 i915_reset_error_state(dev_priv);
2537
2538 return count;
2539}
2540
2541static const struct bin_attribute error_state_attr = {
2542 .attr.name = "error",
2543 .attr.mode = S_IRUSR | S_IWUSR,
2544 .size = 0,
2545 .read = error_state_read,
2546 .write = error_state_write,
2547};
2548
2549void i915_gpu_error_sysfs_setup(struct drm_i915_private *i915)
2550{
2551 struct device *kdev = i915->drm.primary->kdev;
2552
2553 if (sysfs_create_bin_file(&kdev->kobj, &error_state_attr))
2554 drm_err(&i915->drm, "error_state sysfs setup failed\n");
2555}
2556
2557void i915_gpu_error_sysfs_teardown(struct drm_i915_private *i915)
2558{
2559 struct device *kdev = i915->drm.primary->kdev;
2560
2561 sysfs_remove_bin_file(&kdev->kobj, &error_state_attr);
2562}