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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 <generated/utsrelease.h>
31#include "i915_drv.h"
32
33static const char *ring_str(int ring)
34{
35 switch (ring) {
36 case RCS: return "render";
37 case VCS: return "bsd";
38 case BCS: return "blt";
39 case VECS: return "vebox";
40 case VCS2: return "bsd2";
41 default: return "";
42 }
43}
44
45static const char *pin_flag(int pinned)
46{
47 if (pinned > 0)
48 return " P";
49 else if (pinned < 0)
50 return " p";
51 else
52 return "";
53}
54
55static const char *tiling_flag(int tiling)
56{
57 switch (tiling) {
58 default:
59 case I915_TILING_NONE: return "";
60 case I915_TILING_X: return " X";
61 case I915_TILING_Y: return " Y";
62 }
63}
64
65static const char *dirty_flag(int dirty)
66{
67 return dirty ? " dirty" : "";
68}
69
70static const char *purgeable_flag(int purgeable)
71{
72 return purgeable ? " purgeable" : "";
73}
74
75static bool __i915_error_ok(struct drm_i915_error_state_buf *e)
76{
77
78 if (!e->err && WARN(e->bytes > (e->size - 1), "overflow")) {
79 e->err = -ENOSPC;
80 return false;
81 }
82
83 if (e->bytes == e->size - 1 || e->err)
84 return false;
85
86 return true;
87}
88
89static bool __i915_error_seek(struct drm_i915_error_state_buf *e,
90 unsigned len)
91{
92 if (e->pos + len <= e->start) {
93 e->pos += len;
94 return false;
95 }
96
97 /* First vsnprintf needs to fit in its entirety for memmove */
98 if (len >= e->size) {
99 e->err = -EIO;
100 return false;
101 }
102
103 return true;
104}
105
106static void __i915_error_advance(struct drm_i915_error_state_buf *e,
107 unsigned len)
108{
109 /* If this is first printf in this window, adjust it so that
110 * start position matches start of the buffer
111 */
112
113 if (e->pos < e->start) {
114 const size_t off = e->start - e->pos;
115
116 /* Should not happen but be paranoid */
117 if (off > len || e->bytes) {
118 e->err = -EIO;
119 return;
120 }
121
122 memmove(e->buf, e->buf + off, len - off);
123 e->bytes = len - off;
124 e->pos = e->start;
125 return;
126 }
127
128 e->bytes += len;
129 e->pos += len;
130}
131
132static void i915_error_vprintf(struct drm_i915_error_state_buf *e,
133 const char *f, va_list args)
134{
135 unsigned len;
136
137 if (!__i915_error_ok(e))
138 return;
139
140 /* Seek the first printf which is hits start position */
141 if (e->pos < e->start) {
142 va_list tmp;
143
144 va_copy(tmp, args);
145 len = vsnprintf(NULL, 0, f, tmp);
146 va_end(tmp);
147
148 if (!__i915_error_seek(e, len))
149 return;
150 }
151
152 len = vsnprintf(e->buf + e->bytes, e->size - e->bytes, f, args);
153 if (len >= e->size - e->bytes)
154 len = e->size - e->bytes - 1;
155
156 __i915_error_advance(e, len);
157}
158
159static void i915_error_puts(struct drm_i915_error_state_buf *e,
160 const char *str)
161{
162 unsigned len;
163
164 if (!__i915_error_ok(e))
165 return;
166
167 len = strlen(str);
168
169 /* Seek the first printf which is hits start position */
170 if (e->pos < e->start) {
171 if (!__i915_error_seek(e, len))
172 return;
173 }
174
175 if (len >= e->size - e->bytes)
176 len = e->size - e->bytes - 1;
177 memcpy(e->buf + e->bytes, str, len);
178
179 __i915_error_advance(e, len);
180}
181
182#define err_printf(e, ...) i915_error_printf(e, __VA_ARGS__)
183#define err_puts(e, s) i915_error_puts(e, s)
184
185static void print_error_buffers(struct drm_i915_error_state_buf *m,
186 const char *name,
187 struct drm_i915_error_buffer *err,
188 int count)
189{
190 int i;
191
192 err_printf(m, " %s [%d]:\n", name, count);
193
194 while (count--) {
195 err_printf(m, " %08x_%08x %8u %02x %02x [ ",
196 upper_32_bits(err->gtt_offset),
197 lower_32_bits(err->gtt_offset),
198 err->size,
199 err->read_domains,
200 err->write_domain);
201 for (i = 0; i < I915_NUM_RINGS; i++)
202 err_printf(m, "%02x ", err->rseqno[i]);
203
204 err_printf(m, "] %02x", err->wseqno);
205 err_puts(m, pin_flag(err->pinned));
206 err_puts(m, tiling_flag(err->tiling));
207 err_puts(m, dirty_flag(err->dirty));
208 err_puts(m, purgeable_flag(err->purgeable));
209 err_puts(m, err->userptr ? " userptr" : "");
210 err_puts(m, err->ring != -1 ? " " : "");
211 err_puts(m, ring_str(err->ring));
212 err_puts(m, i915_cache_level_str(m->i915, err->cache_level));
213
214 if (err->name)
215 err_printf(m, " (name: %d)", err->name);
216 if (err->fence_reg != I915_FENCE_REG_NONE)
217 err_printf(m, " (fence: %d)", err->fence_reg);
218
219 err_puts(m, "\n");
220 err++;
221 }
222}
223
224static const char *hangcheck_action_to_str(enum intel_ring_hangcheck_action a)
225{
226 switch (a) {
227 case HANGCHECK_IDLE:
228 return "idle";
229 case HANGCHECK_WAIT:
230 return "wait";
231 case HANGCHECK_ACTIVE:
232 return "active";
233 case HANGCHECK_ACTIVE_LOOP:
234 return "active (loop)";
235 case HANGCHECK_KICK:
236 return "kick";
237 case HANGCHECK_HUNG:
238 return "hung";
239 }
240
241 return "unknown";
242}
243
244static void i915_ring_error_state(struct drm_i915_error_state_buf *m,
245 struct drm_device *dev,
246 struct drm_i915_error_state *error,
247 int ring_idx)
248{
249 struct drm_i915_error_ring *ring = &error->ring[ring_idx];
250
251 if (!ring->valid)
252 return;
253
254 err_printf(m, "%s command stream:\n", ring_str(ring_idx));
255 err_printf(m, " START: 0x%08x\n", ring->start);
256 err_printf(m, " HEAD: 0x%08x\n", ring->head);
257 err_printf(m, " TAIL: 0x%08x\n", ring->tail);
258 err_printf(m, " CTL: 0x%08x\n", ring->ctl);
259 err_printf(m, " HWS: 0x%08x\n", ring->hws);
260 err_printf(m, " ACTHD: 0x%08x %08x\n", (u32)(ring->acthd>>32), (u32)ring->acthd);
261 err_printf(m, " IPEIR: 0x%08x\n", ring->ipeir);
262 err_printf(m, " IPEHR: 0x%08x\n", ring->ipehr);
263 err_printf(m, " INSTDONE: 0x%08x\n", ring->instdone);
264 if (INTEL_INFO(dev)->gen >= 4) {
265 err_printf(m, " BBADDR: 0x%08x %08x\n", (u32)(ring->bbaddr>>32), (u32)ring->bbaddr);
266 err_printf(m, " BB_STATE: 0x%08x\n", ring->bbstate);
267 err_printf(m, " INSTPS: 0x%08x\n", ring->instps);
268 }
269 err_printf(m, " INSTPM: 0x%08x\n", ring->instpm);
270 err_printf(m, " FADDR: 0x%08x %08x\n", upper_32_bits(ring->faddr),
271 lower_32_bits(ring->faddr));
272 if (INTEL_INFO(dev)->gen >= 6) {
273 err_printf(m, " RC PSMI: 0x%08x\n", ring->rc_psmi);
274 err_printf(m, " FAULT_REG: 0x%08x\n", ring->fault_reg);
275 err_printf(m, " SYNC_0: 0x%08x [last synced 0x%08x]\n",
276 ring->semaphore_mboxes[0],
277 ring->semaphore_seqno[0]);
278 err_printf(m, " SYNC_1: 0x%08x [last synced 0x%08x]\n",
279 ring->semaphore_mboxes[1],
280 ring->semaphore_seqno[1]);
281 if (HAS_VEBOX(dev)) {
282 err_printf(m, " SYNC_2: 0x%08x [last synced 0x%08x]\n",
283 ring->semaphore_mboxes[2],
284 ring->semaphore_seqno[2]);
285 }
286 }
287 if (USES_PPGTT(dev)) {
288 err_printf(m, " GFX_MODE: 0x%08x\n", ring->vm_info.gfx_mode);
289
290 if (INTEL_INFO(dev)->gen >= 8) {
291 int i;
292 for (i = 0; i < 4; i++)
293 err_printf(m, " PDP%d: 0x%016llx\n",
294 i, ring->vm_info.pdp[i]);
295 } else {
296 err_printf(m, " PP_DIR_BASE: 0x%08x\n",
297 ring->vm_info.pp_dir_base);
298 }
299 }
300 err_printf(m, " seqno: 0x%08x\n", ring->seqno);
301 err_printf(m, " waiting: %s\n", yesno(ring->waiting));
302 err_printf(m, " ring->head: 0x%08x\n", ring->cpu_ring_head);
303 err_printf(m, " ring->tail: 0x%08x\n", ring->cpu_ring_tail);
304 err_printf(m, " hangcheck: %s [%d]\n",
305 hangcheck_action_to_str(ring->hangcheck_action),
306 ring->hangcheck_score);
307}
308
309void i915_error_printf(struct drm_i915_error_state_buf *e, const char *f, ...)
310{
311 va_list args;
312
313 va_start(args, f);
314 i915_error_vprintf(e, f, args);
315 va_end(args);
316}
317
318static void print_error_obj(struct drm_i915_error_state_buf *m,
319 struct drm_i915_error_object *obj)
320{
321 int page, offset, elt;
322
323 for (page = offset = 0; page < obj->page_count; page++) {
324 for (elt = 0; elt < PAGE_SIZE/4; elt++) {
325 err_printf(m, "%08x : %08x\n", offset,
326 obj->pages[page][elt]);
327 offset += 4;
328 }
329 }
330}
331
332int i915_error_state_to_str(struct drm_i915_error_state_buf *m,
333 const struct i915_error_state_file_priv *error_priv)
334{
335 struct drm_device *dev = error_priv->dev;
336 struct drm_i915_private *dev_priv = dev->dev_private;
337 struct drm_i915_error_state *error = error_priv->error;
338 struct drm_i915_error_object *obj;
339 int i, j, offset, elt;
340 int max_hangcheck_score;
341
342 if (!error) {
343 err_printf(m, "no error state collected\n");
344 goto out;
345 }
346
347 err_printf(m, "%s\n", error->error_msg);
348 err_printf(m, "Time: %ld s %ld us\n", error->time.tv_sec,
349 error->time.tv_usec);
350 err_printf(m, "Kernel: " UTS_RELEASE "\n");
351 max_hangcheck_score = 0;
352 for (i = 0; i < ARRAY_SIZE(error->ring); i++) {
353 if (error->ring[i].hangcheck_score > max_hangcheck_score)
354 max_hangcheck_score = error->ring[i].hangcheck_score;
355 }
356 for (i = 0; i < ARRAY_SIZE(error->ring); i++) {
357 if (error->ring[i].hangcheck_score == max_hangcheck_score &&
358 error->ring[i].pid != -1) {
359 err_printf(m, "Active process (on ring %s): %s [%d]\n",
360 ring_str(i),
361 error->ring[i].comm,
362 error->ring[i].pid);
363 }
364 }
365 err_printf(m, "Reset count: %u\n", error->reset_count);
366 err_printf(m, "Suspend count: %u\n", error->suspend_count);
367 err_printf(m, "PCI ID: 0x%04x\n", dev->pdev->device);
368 err_printf(m, "PCI Revision: 0x%02x\n", dev->pdev->revision);
369 err_printf(m, "PCI Subsystem: %04x:%04x\n",
370 dev->pdev->subsystem_vendor,
371 dev->pdev->subsystem_device);
372 err_printf(m, "IOMMU enabled?: %d\n", error->iommu);
373
374 if (HAS_CSR(dev)) {
375 struct intel_csr *csr = &dev_priv->csr;
376
377 err_printf(m, "DMC loaded: %s\n",
378 yesno(csr->dmc_payload != NULL));
379 err_printf(m, "DMC fw version: %d.%d\n",
380 CSR_VERSION_MAJOR(csr->version),
381 CSR_VERSION_MINOR(csr->version));
382 }
383
384 err_printf(m, "EIR: 0x%08x\n", error->eir);
385 err_printf(m, "IER: 0x%08x\n", error->ier);
386 if (INTEL_INFO(dev)->gen >= 8) {
387 for (i = 0; i < 4; i++)
388 err_printf(m, "GTIER gt %d: 0x%08x\n", i,
389 error->gtier[i]);
390 } else if (HAS_PCH_SPLIT(dev) || IS_VALLEYVIEW(dev))
391 err_printf(m, "GTIER: 0x%08x\n", error->gtier[0]);
392 err_printf(m, "PGTBL_ER: 0x%08x\n", error->pgtbl_er);
393 err_printf(m, "FORCEWAKE: 0x%08x\n", error->forcewake);
394 err_printf(m, "DERRMR: 0x%08x\n", error->derrmr);
395 err_printf(m, "CCID: 0x%08x\n", error->ccid);
396 err_printf(m, "Missed interrupts: 0x%08lx\n", dev_priv->gpu_error.missed_irq_rings);
397
398 for (i = 0; i < dev_priv->num_fence_regs; i++)
399 err_printf(m, " fence[%d] = %08llx\n", i, error->fence[i]);
400
401 for (i = 0; i < ARRAY_SIZE(error->extra_instdone); i++)
402 err_printf(m, " INSTDONE_%d: 0x%08x\n", i,
403 error->extra_instdone[i]);
404
405 if (INTEL_INFO(dev)->gen >= 6) {
406 err_printf(m, "ERROR: 0x%08x\n", error->error);
407
408 if (INTEL_INFO(dev)->gen >= 8)
409 err_printf(m, "FAULT_TLB_DATA: 0x%08x 0x%08x\n",
410 error->fault_data1, error->fault_data0);
411
412 err_printf(m, "DONE_REG: 0x%08x\n", error->done_reg);
413 }
414
415 if (INTEL_INFO(dev)->gen == 7)
416 err_printf(m, "ERR_INT: 0x%08x\n", error->err_int);
417
418 for (i = 0; i < ARRAY_SIZE(error->ring); i++)
419 i915_ring_error_state(m, dev, error, i);
420
421 for (i = 0; i < error->vm_count; i++) {
422 err_printf(m, "vm[%d]\n", i);
423
424 print_error_buffers(m, "Active",
425 error->active_bo[i],
426 error->active_bo_count[i]);
427
428 print_error_buffers(m, "Pinned",
429 error->pinned_bo[i],
430 error->pinned_bo_count[i]);
431 }
432
433 for (i = 0; i < ARRAY_SIZE(error->ring); i++) {
434 obj = error->ring[i].batchbuffer;
435 if (obj) {
436 err_puts(m, dev_priv->ring[i].name);
437 if (error->ring[i].pid != -1)
438 err_printf(m, " (submitted by %s [%d])",
439 error->ring[i].comm,
440 error->ring[i].pid);
441 err_printf(m, " --- gtt_offset = 0x%08x %08x\n",
442 upper_32_bits(obj->gtt_offset),
443 lower_32_bits(obj->gtt_offset));
444 print_error_obj(m, obj);
445 }
446
447 obj = error->ring[i].wa_batchbuffer;
448 if (obj) {
449 err_printf(m, "%s (w/a) --- gtt_offset = 0x%08x\n",
450 dev_priv->ring[i].name,
451 lower_32_bits(obj->gtt_offset));
452 print_error_obj(m, obj);
453 }
454
455 if (error->ring[i].num_requests) {
456 err_printf(m, "%s --- %d requests\n",
457 dev_priv->ring[i].name,
458 error->ring[i].num_requests);
459 for (j = 0; j < error->ring[i].num_requests; j++) {
460 err_printf(m, " seqno 0x%08x, emitted %ld, tail 0x%08x\n",
461 error->ring[i].requests[j].seqno,
462 error->ring[i].requests[j].jiffies,
463 error->ring[i].requests[j].tail);
464 }
465 }
466
467 if ((obj = error->ring[i].ringbuffer)) {
468 err_printf(m, "%s --- ringbuffer = 0x%08x\n",
469 dev_priv->ring[i].name,
470 lower_32_bits(obj->gtt_offset));
471 print_error_obj(m, obj);
472 }
473
474 if ((obj = error->ring[i].hws_page)) {
475 u64 hws_offset = obj->gtt_offset;
476 u32 *hws_page = &obj->pages[0][0];
477
478 if (i915.enable_execlists) {
479 hws_offset += LRC_PPHWSP_PN * PAGE_SIZE;
480 hws_page = &obj->pages[LRC_PPHWSP_PN][0];
481 }
482 err_printf(m, "%s --- HW Status = 0x%08llx\n",
483 dev_priv->ring[i].name, hws_offset);
484 offset = 0;
485 for (elt = 0; elt < PAGE_SIZE/16; elt += 4) {
486 err_printf(m, "[%04x] %08x %08x %08x %08x\n",
487 offset,
488 hws_page[elt],
489 hws_page[elt+1],
490 hws_page[elt+2],
491 hws_page[elt+3]);
492 offset += 16;
493 }
494 }
495
496 if ((obj = error->ring[i].ctx)) {
497 err_printf(m, "%s --- HW Context = 0x%08x\n",
498 dev_priv->ring[i].name,
499 lower_32_bits(obj->gtt_offset));
500 print_error_obj(m, obj);
501 }
502 }
503
504 if ((obj = error->semaphore_obj)) {
505 err_printf(m, "Semaphore page = 0x%08x\n",
506 lower_32_bits(obj->gtt_offset));
507 for (elt = 0; elt < PAGE_SIZE/16; elt += 4) {
508 err_printf(m, "[%04x] %08x %08x %08x %08x\n",
509 elt * 4,
510 obj->pages[0][elt],
511 obj->pages[0][elt+1],
512 obj->pages[0][elt+2],
513 obj->pages[0][elt+3]);
514 }
515 }
516
517 if (error->overlay)
518 intel_overlay_print_error_state(m, error->overlay);
519
520 if (error->display)
521 intel_display_print_error_state(m, dev, error->display);
522
523out:
524 if (m->bytes == 0 && m->err)
525 return m->err;
526
527 return 0;
528}
529
530int i915_error_state_buf_init(struct drm_i915_error_state_buf *ebuf,
531 struct drm_i915_private *i915,
532 size_t count, loff_t pos)
533{
534 memset(ebuf, 0, sizeof(*ebuf));
535 ebuf->i915 = i915;
536
537 /* We need to have enough room to store any i915_error_state printf
538 * so that we can move it to start position.
539 */
540 ebuf->size = count + 1 > PAGE_SIZE ? count + 1 : PAGE_SIZE;
541 ebuf->buf = kmalloc(ebuf->size,
542 GFP_TEMPORARY | __GFP_NORETRY | __GFP_NOWARN);
543
544 if (ebuf->buf == NULL) {
545 ebuf->size = PAGE_SIZE;
546 ebuf->buf = kmalloc(ebuf->size, GFP_TEMPORARY);
547 }
548
549 if (ebuf->buf == NULL) {
550 ebuf->size = 128;
551 ebuf->buf = kmalloc(ebuf->size, GFP_TEMPORARY);
552 }
553
554 if (ebuf->buf == NULL)
555 return -ENOMEM;
556
557 ebuf->start = pos;
558
559 return 0;
560}
561
562static void i915_error_object_free(struct drm_i915_error_object *obj)
563{
564 int page;
565
566 if (obj == NULL)
567 return;
568
569 for (page = 0; page < obj->page_count; page++)
570 kfree(obj->pages[page]);
571
572 kfree(obj);
573}
574
575static void i915_error_state_free(struct kref *error_ref)
576{
577 struct drm_i915_error_state *error = container_of(error_ref,
578 typeof(*error), ref);
579 int i;
580
581 for (i = 0; i < ARRAY_SIZE(error->ring); i++) {
582 i915_error_object_free(error->ring[i].batchbuffer);
583 i915_error_object_free(error->ring[i].wa_batchbuffer);
584 i915_error_object_free(error->ring[i].ringbuffer);
585 i915_error_object_free(error->ring[i].hws_page);
586 i915_error_object_free(error->ring[i].ctx);
587 kfree(error->ring[i].requests);
588 }
589
590 i915_error_object_free(error->semaphore_obj);
591
592 for (i = 0; i < error->vm_count; i++)
593 kfree(error->active_bo[i]);
594
595 kfree(error->active_bo);
596 kfree(error->active_bo_count);
597 kfree(error->pinned_bo);
598 kfree(error->pinned_bo_count);
599 kfree(error->overlay);
600 kfree(error->display);
601 kfree(error);
602}
603
604static struct drm_i915_error_object *
605i915_error_object_create(struct drm_i915_private *dev_priv,
606 struct drm_i915_gem_object *src,
607 struct i915_address_space *vm)
608{
609 struct drm_i915_error_object *dst;
610 struct i915_vma *vma = NULL;
611 int num_pages;
612 bool use_ggtt;
613 int i = 0;
614 u64 reloc_offset;
615
616 if (src == NULL || src->pages == NULL)
617 return NULL;
618
619 num_pages = src->base.size >> PAGE_SHIFT;
620
621 dst = kmalloc(sizeof(*dst) + num_pages * sizeof(u32 *), GFP_ATOMIC);
622 if (dst == NULL)
623 return NULL;
624
625 if (i915_gem_obj_bound(src, vm))
626 dst->gtt_offset = i915_gem_obj_offset(src, vm);
627 else
628 dst->gtt_offset = -1;
629
630 reloc_offset = dst->gtt_offset;
631 if (i915_is_ggtt(vm))
632 vma = i915_gem_obj_to_ggtt(src);
633 use_ggtt = (src->cache_level == I915_CACHE_NONE &&
634 vma && (vma->bound & GLOBAL_BIND) &&
635 reloc_offset + num_pages * PAGE_SIZE <= dev_priv->gtt.mappable_end);
636
637 /* Cannot access stolen address directly, try to use the aperture */
638 if (src->stolen) {
639 use_ggtt = true;
640
641 if (!(vma && vma->bound & GLOBAL_BIND))
642 goto unwind;
643
644 reloc_offset = i915_gem_obj_ggtt_offset(src);
645 if (reloc_offset + num_pages * PAGE_SIZE > dev_priv->gtt.mappable_end)
646 goto unwind;
647 }
648
649 /* Cannot access snooped pages through the aperture */
650 if (use_ggtt && src->cache_level != I915_CACHE_NONE && !HAS_LLC(dev_priv->dev))
651 goto unwind;
652
653 dst->page_count = num_pages;
654 while (num_pages--) {
655 unsigned long flags;
656 void *d;
657
658 d = kmalloc(PAGE_SIZE, GFP_ATOMIC);
659 if (d == NULL)
660 goto unwind;
661
662 local_irq_save(flags);
663 if (use_ggtt) {
664 void __iomem *s;
665
666 /* Simply ignore tiling or any overlapping fence.
667 * It's part of the error state, and this hopefully
668 * captures what the GPU read.
669 */
670
671 s = io_mapping_map_atomic_wc(dev_priv->gtt.mappable,
672 reloc_offset);
673 memcpy_fromio(d, s, PAGE_SIZE);
674 io_mapping_unmap_atomic(s);
675 } else {
676 struct page *page;
677 void *s;
678
679 page = i915_gem_object_get_page(src, i);
680
681 drm_clflush_pages(&page, 1);
682
683 s = kmap_atomic(page);
684 memcpy(d, s, PAGE_SIZE);
685 kunmap_atomic(s);
686
687 drm_clflush_pages(&page, 1);
688 }
689 local_irq_restore(flags);
690
691 dst->pages[i++] = d;
692 reloc_offset += PAGE_SIZE;
693 }
694
695 return dst;
696
697unwind:
698 while (i--)
699 kfree(dst->pages[i]);
700 kfree(dst);
701 return NULL;
702}
703#define i915_error_ggtt_object_create(dev_priv, src) \
704 i915_error_object_create((dev_priv), (src), &(dev_priv)->gtt.base)
705
706static void capture_bo(struct drm_i915_error_buffer *err,
707 struct i915_vma *vma)
708{
709 struct drm_i915_gem_object *obj = vma->obj;
710 int i;
711
712 err->size = obj->base.size;
713 err->name = obj->base.name;
714 for (i = 0; i < I915_NUM_RINGS; i++)
715 err->rseqno[i] = i915_gem_request_get_seqno(obj->last_read_req[i]);
716 err->wseqno = i915_gem_request_get_seqno(obj->last_write_req);
717 err->gtt_offset = vma->node.start;
718 err->read_domains = obj->base.read_domains;
719 err->write_domain = obj->base.write_domain;
720 err->fence_reg = obj->fence_reg;
721 err->pinned = 0;
722 if (i915_gem_obj_is_pinned(obj))
723 err->pinned = 1;
724 err->tiling = obj->tiling_mode;
725 err->dirty = obj->dirty;
726 err->purgeable = obj->madv != I915_MADV_WILLNEED;
727 err->userptr = obj->userptr.mm != NULL;
728 err->ring = obj->last_write_req ?
729 i915_gem_request_get_ring(obj->last_write_req)->id : -1;
730 err->cache_level = obj->cache_level;
731}
732
733static u32 capture_active_bo(struct drm_i915_error_buffer *err,
734 int count, struct list_head *head)
735{
736 struct i915_vma *vma;
737 int i = 0;
738
739 list_for_each_entry(vma, head, vm_link) {
740 capture_bo(err++, vma);
741 if (++i == count)
742 break;
743 }
744
745 return i;
746}
747
748static u32 capture_pinned_bo(struct drm_i915_error_buffer *err,
749 int count, struct list_head *head,
750 struct i915_address_space *vm)
751{
752 struct drm_i915_gem_object *obj;
753 struct drm_i915_error_buffer * const first = err;
754 struct drm_i915_error_buffer * const last = err + count;
755
756 list_for_each_entry(obj, head, global_list) {
757 struct i915_vma *vma;
758
759 if (err == last)
760 break;
761
762 list_for_each_entry(vma, &obj->vma_list, obj_link)
763 if (vma->vm == vm && vma->pin_count > 0)
764 capture_bo(err++, vma);
765 }
766
767 return err - first;
768}
769
770/* Generate a semi-unique error code. The code is not meant to have meaning, The
771 * code's only purpose is to try to prevent false duplicated bug reports by
772 * grossly estimating a GPU error state.
773 *
774 * TODO Ideally, hashing the batchbuffer would be a very nice way to determine
775 * the hang if we could strip the GTT offset information from it.
776 *
777 * It's only a small step better than a random number in its current form.
778 */
779static uint32_t i915_error_generate_code(struct drm_i915_private *dev_priv,
780 struct drm_i915_error_state *error,
781 int *ring_id)
782{
783 uint32_t error_code = 0;
784 int i;
785
786 /* IPEHR would be an ideal way to detect errors, as it's the gross
787 * measure of "the command that hung." However, has some very common
788 * synchronization commands which almost always appear in the case
789 * strictly a client bug. Use instdone to differentiate those some.
790 */
791 for (i = 0; i < I915_NUM_RINGS; i++) {
792 if (error->ring[i].hangcheck_action == HANGCHECK_HUNG) {
793 if (ring_id)
794 *ring_id = i;
795
796 return error->ring[i].ipehr ^ error->ring[i].instdone;
797 }
798 }
799
800 return error_code;
801}
802
803static void i915_gem_record_fences(struct drm_device *dev,
804 struct drm_i915_error_state *error)
805{
806 struct drm_i915_private *dev_priv = dev->dev_private;
807 int i;
808
809 if (IS_GEN3(dev) || IS_GEN2(dev)) {
810 for (i = 0; i < dev_priv->num_fence_regs; i++)
811 error->fence[i] = I915_READ(FENCE_REG(i));
812 } else if (IS_GEN5(dev) || IS_GEN4(dev)) {
813 for (i = 0; i < dev_priv->num_fence_regs; i++)
814 error->fence[i] = I915_READ64(FENCE_REG_965_LO(i));
815 } else if (INTEL_INFO(dev)->gen >= 6) {
816 for (i = 0; i < dev_priv->num_fence_regs; i++)
817 error->fence[i] = I915_READ64(FENCE_REG_GEN6_LO(i));
818 }
819}
820
821
822static void gen8_record_semaphore_state(struct drm_i915_private *dev_priv,
823 struct drm_i915_error_state *error,
824 struct intel_engine_cs *ring,
825 struct drm_i915_error_ring *ering)
826{
827 struct intel_engine_cs *to;
828 int i;
829
830 if (!i915_semaphore_is_enabled(dev_priv->dev))
831 return;
832
833 if (!error->semaphore_obj)
834 error->semaphore_obj =
835 i915_error_ggtt_object_create(dev_priv,
836 dev_priv->semaphore_obj);
837
838 for_each_ring(to, dev_priv, i) {
839 int idx;
840 u16 signal_offset;
841 u32 *tmp;
842
843 if (ring == to)
844 continue;
845
846 signal_offset = (GEN8_SIGNAL_OFFSET(ring, i) & (PAGE_SIZE - 1))
847 / 4;
848 tmp = error->semaphore_obj->pages[0];
849 idx = intel_ring_sync_index(ring, to);
850
851 ering->semaphore_mboxes[idx] = tmp[signal_offset];
852 ering->semaphore_seqno[idx] = ring->semaphore.sync_seqno[idx];
853 }
854}
855
856static void gen6_record_semaphore_state(struct drm_i915_private *dev_priv,
857 struct intel_engine_cs *ring,
858 struct drm_i915_error_ring *ering)
859{
860 ering->semaphore_mboxes[0] = I915_READ(RING_SYNC_0(ring->mmio_base));
861 ering->semaphore_mboxes[1] = I915_READ(RING_SYNC_1(ring->mmio_base));
862 ering->semaphore_seqno[0] = ring->semaphore.sync_seqno[0];
863 ering->semaphore_seqno[1] = ring->semaphore.sync_seqno[1];
864
865 if (HAS_VEBOX(dev_priv->dev)) {
866 ering->semaphore_mboxes[2] =
867 I915_READ(RING_SYNC_2(ring->mmio_base));
868 ering->semaphore_seqno[2] = ring->semaphore.sync_seqno[2];
869 }
870}
871
872static void i915_record_ring_state(struct drm_device *dev,
873 struct drm_i915_error_state *error,
874 struct intel_engine_cs *ring,
875 struct drm_i915_error_ring *ering)
876{
877 struct drm_i915_private *dev_priv = dev->dev_private;
878
879 if (INTEL_INFO(dev)->gen >= 6) {
880 ering->rc_psmi = I915_READ(RING_PSMI_CTL(ring->mmio_base));
881 ering->fault_reg = I915_READ(RING_FAULT_REG(ring));
882 if (INTEL_INFO(dev)->gen >= 8)
883 gen8_record_semaphore_state(dev_priv, error, ring, ering);
884 else
885 gen6_record_semaphore_state(dev_priv, ring, ering);
886 }
887
888 if (INTEL_INFO(dev)->gen >= 4) {
889 ering->faddr = I915_READ(RING_DMA_FADD(ring->mmio_base));
890 ering->ipeir = I915_READ(RING_IPEIR(ring->mmio_base));
891 ering->ipehr = I915_READ(RING_IPEHR(ring->mmio_base));
892 ering->instdone = I915_READ(RING_INSTDONE(ring->mmio_base));
893 ering->instps = I915_READ(RING_INSTPS(ring->mmio_base));
894 ering->bbaddr = I915_READ(RING_BBADDR(ring->mmio_base));
895 if (INTEL_INFO(dev)->gen >= 8) {
896 ering->faddr |= (u64) I915_READ(RING_DMA_FADD_UDW(ring->mmio_base)) << 32;
897 ering->bbaddr |= (u64) I915_READ(RING_BBADDR_UDW(ring->mmio_base)) << 32;
898 }
899 ering->bbstate = I915_READ(RING_BBSTATE(ring->mmio_base));
900 } else {
901 ering->faddr = I915_READ(DMA_FADD_I8XX);
902 ering->ipeir = I915_READ(IPEIR);
903 ering->ipehr = I915_READ(IPEHR);
904 ering->instdone = I915_READ(GEN2_INSTDONE);
905 }
906
907 ering->waiting = waitqueue_active(&ring->irq_queue);
908 ering->instpm = I915_READ(RING_INSTPM(ring->mmio_base));
909 ering->seqno = ring->get_seqno(ring, false);
910 ering->acthd = intel_ring_get_active_head(ring);
911 ering->start = I915_READ_START(ring);
912 ering->head = I915_READ_HEAD(ring);
913 ering->tail = I915_READ_TAIL(ring);
914 ering->ctl = I915_READ_CTL(ring);
915
916 if (I915_NEED_GFX_HWS(dev)) {
917 i915_reg_t mmio;
918
919 if (IS_GEN7(dev)) {
920 switch (ring->id) {
921 default:
922 case RCS:
923 mmio = RENDER_HWS_PGA_GEN7;
924 break;
925 case BCS:
926 mmio = BLT_HWS_PGA_GEN7;
927 break;
928 case VCS:
929 mmio = BSD_HWS_PGA_GEN7;
930 break;
931 case VECS:
932 mmio = VEBOX_HWS_PGA_GEN7;
933 break;
934 }
935 } else if (IS_GEN6(ring->dev)) {
936 mmio = RING_HWS_PGA_GEN6(ring->mmio_base);
937 } else {
938 /* XXX: gen8 returns to sanity */
939 mmio = RING_HWS_PGA(ring->mmio_base);
940 }
941
942 ering->hws = I915_READ(mmio);
943 }
944
945 ering->hangcheck_score = ring->hangcheck.score;
946 ering->hangcheck_action = ring->hangcheck.action;
947
948 if (USES_PPGTT(dev)) {
949 int i;
950
951 ering->vm_info.gfx_mode = I915_READ(RING_MODE_GEN7(ring));
952
953 if (IS_GEN6(dev))
954 ering->vm_info.pp_dir_base =
955 I915_READ(RING_PP_DIR_BASE_READ(ring));
956 else if (IS_GEN7(dev))
957 ering->vm_info.pp_dir_base =
958 I915_READ(RING_PP_DIR_BASE(ring));
959 else if (INTEL_INFO(dev)->gen >= 8)
960 for (i = 0; i < 4; i++) {
961 ering->vm_info.pdp[i] =
962 I915_READ(GEN8_RING_PDP_UDW(ring, i));
963 ering->vm_info.pdp[i] <<= 32;
964 ering->vm_info.pdp[i] |=
965 I915_READ(GEN8_RING_PDP_LDW(ring, i));
966 }
967 }
968}
969
970
971static void i915_gem_record_active_context(struct intel_engine_cs *ring,
972 struct drm_i915_error_state *error,
973 struct drm_i915_error_ring *ering)
974{
975 struct drm_i915_private *dev_priv = ring->dev->dev_private;
976 struct drm_i915_gem_object *obj;
977
978 /* Currently render ring is the only HW context user */
979 if (ring->id != RCS || !error->ccid)
980 return;
981
982 list_for_each_entry(obj, &dev_priv->mm.bound_list, global_list) {
983 if (!i915_gem_obj_ggtt_bound(obj))
984 continue;
985
986 if ((error->ccid & PAGE_MASK) == i915_gem_obj_ggtt_offset(obj)) {
987 ering->ctx = i915_error_ggtt_object_create(dev_priv, obj);
988 break;
989 }
990 }
991}
992
993static void i915_gem_record_rings(struct drm_device *dev,
994 struct drm_i915_error_state *error)
995{
996 struct drm_i915_private *dev_priv = dev->dev_private;
997 struct drm_i915_gem_request *request;
998 int i, count;
999
1000 for (i = 0; i < I915_NUM_RINGS; i++) {
1001 struct intel_engine_cs *ring = &dev_priv->ring[i];
1002 struct intel_ringbuffer *rbuf;
1003
1004 error->ring[i].pid = -1;
1005
1006 if (ring->dev == NULL)
1007 continue;
1008
1009 error->ring[i].valid = true;
1010
1011 i915_record_ring_state(dev, error, ring, &error->ring[i]);
1012
1013 request = i915_gem_find_active_request(ring);
1014 if (request) {
1015 struct i915_address_space *vm;
1016
1017 vm = request->ctx && request->ctx->ppgtt ?
1018 &request->ctx->ppgtt->base :
1019 &dev_priv->gtt.base;
1020
1021 /* We need to copy these to an anonymous buffer
1022 * as the simplest method to avoid being overwritten
1023 * by userspace.
1024 */
1025 error->ring[i].batchbuffer =
1026 i915_error_object_create(dev_priv,
1027 request->batch_obj,
1028 vm);
1029
1030 if (HAS_BROKEN_CS_TLB(dev_priv->dev))
1031 error->ring[i].wa_batchbuffer =
1032 i915_error_ggtt_object_create(dev_priv,
1033 ring->scratch.obj);
1034
1035 if (request->pid) {
1036 struct task_struct *task;
1037
1038 rcu_read_lock();
1039 task = pid_task(request->pid, PIDTYPE_PID);
1040 if (task) {
1041 strcpy(error->ring[i].comm, task->comm);
1042 error->ring[i].pid = task->pid;
1043 }
1044 rcu_read_unlock();
1045 }
1046 }
1047
1048 if (i915.enable_execlists) {
1049 /* TODO: This is only a small fix to keep basic error
1050 * capture working, but we need to add more information
1051 * for it to be useful (e.g. dump the context being
1052 * executed).
1053 */
1054 if (request)
1055 rbuf = request->ctx->engine[ring->id].ringbuf;
1056 else
1057 rbuf = dev_priv->kernel_context->engine[ring->id].ringbuf;
1058 } else
1059 rbuf = ring->buffer;
1060
1061 error->ring[i].cpu_ring_head = rbuf->head;
1062 error->ring[i].cpu_ring_tail = rbuf->tail;
1063
1064 error->ring[i].ringbuffer =
1065 i915_error_ggtt_object_create(dev_priv, rbuf->obj);
1066
1067 error->ring[i].hws_page =
1068 i915_error_ggtt_object_create(dev_priv, ring->status_page.obj);
1069
1070 i915_gem_record_active_context(ring, error, &error->ring[i]);
1071
1072 count = 0;
1073 list_for_each_entry(request, &ring->request_list, list)
1074 count++;
1075
1076 error->ring[i].num_requests = count;
1077 error->ring[i].requests =
1078 kcalloc(count, sizeof(*error->ring[i].requests),
1079 GFP_ATOMIC);
1080 if (error->ring[i].requests == NULL) {
1081 error->ring[i].num_requests = 0;
1082 continue;
1083 }
1084
1085 count = 0;
1086 list_for_each_entry(request, &ring->request_list, list) {
1087 struct drm_i915_error_request *erq;
1088
1089 if (count >= error->ring[i].num_requests) {
1090 /*
1091 * If the ring request list was changed in
1092 * between the point where the error request
1093 * list was created and dimensioned and this
1094 * point then just exit early to avoid crashes.
1095 *
1096 * We don't need to communicate that the
1097 * request list changed state during error
1098 * state capture and that the error state is
1099 * slightly incorrect as a consequence since we
1100 * are typically only interested in the request
1101 * list state at the point of error state
1102 * capture, not in any changes happening during
1103 * the capture.
1104 */
1105 break;
1106 }
1107
1108 erq = &error->ring[i].requests[count++];
1109 erq->seqno = request->seqno;
1110 erq->jiffies = request->emitted_jiffies;
1111 erq->tail = request->postfix;
1112 }
1113 }
1114}
1115
1116/* FIXME: Since pin count/bound list is global, we duplicate what we capture per
1117 * VM.
1118 */
1119static void i915_gem_capture_vm(struct drm_i915_private *dev_priv,
1120 struct drm_i915_error_state *error,
1121 struct i915_address_space *vm,
1122 const int ndx)
1123{
1124 struct drm_i915_error_buffer *active_bo = NULL, *pinned_bo = NULL;
1125 struct drm_i915_gem_object *obj;
1126 struct i915_vma *vma;
1127 int i;
1128
1129 i = 0;
1130 list_for_each_entry(vma, &vm->active_list, vm_link)
1131 i++;
1132 error->active_bo_count[ndx] = i;
1133
1134 list_for_each_entry(obj, &dev_priv->mm.bound_list, global_list) {
1135 list_for_each_entry(vma, &obj->vma_list, obj_link)
1136 if (vma->vm == vm && vma->pin_count > 0)
1137 i++;
1138 }
1139 error->pinned_bo_count[ndx] = i - error->active_bo_count[ndx];
1140
1141 if (i) {
1142 active_bo = kcalloc(i, sizeof(*active_bo), GFP_ATOMIC);
1143 if (active_bo)
1144 pinned_bo = active_bo + error->active_bo_count[ndx];
1145 }
1146
1147 if (active_bo)
1148 error->active_bo_count[ndx] =
1149 capture_active_bo(active_bo,
1150 error->active_bo_count[ndx],
1151 &vm->active_list);
1152
1153 if (pinned_bo)
1154 error->pinned_bo_count[ndx] =
1155 capture_pinned_bo(pinned_bo,
1156 error->pinned_bo_count[ndx],
1157 &dev_priv->mm.bound_list, vm);
1158 error->active_bo[ndx] = active_bo;
1159 error->pinned_bo[ndx] = pinned_bo;
1160}
1161
1162static void i915_gem_capture_buffers(struct drm_i915_private *dev_priv,
1163 struct drm_i915_error_state *error)
1164{
1165 struct i915_address_space *vm;
1166 int cnt = 0, i = 0;
1167
1168 list_for_each_entry(vm, &dev_priv->vm_list, global_link)
1169 cnt++;
1170
1171 error->active_bo = kcalloc(cnt, sizeof(*error->active_bo), GFP_ATOMIC);
1172 error->pinned_bo = kcalloc(cnt, sizeof(*error->pinned_bo), GFP_ATOMIC);
1173 error->active_bo_count = kcalloc(cnt, sizeof(*error->active_bo_count),
1174 GFP_ATOMIC);
1175 error->pinned_bo_count = kcalloc(cnt, sizeof(*error->pinned_bo_count),
1176 GFP_ATOMIC);
1177
1178 if (error->active_bo == NULL ||
1179 error->pinned_bo == NULL ||
1180 error->active_bo_count == NULL ||
1181 error->pinned_bo_count == NULL) {
1182 kfree(error->active_bo);
1183 kfree(error->active_bo_count);
1184 kfree(error->pinned_bo);
1185 kfree(error->pinned_bo_count);
1186
1187 error->active_bo = NULL;
1188 error->active_bo_count = NULL;
1189 error->pinned_bo = NULL;
1190 error->pinned_bo_count = NULL;
1191 } else {
1192 list_for_each_entry(vm, &dev_priv->vm_list, global_link)
1193 i915_gem_capture_vm(dev_priv, error, vm, i++);
1194
1195 error->vm_count = cnt;
1196 }
1197}
1198
1199/* Capture all registers which don't fit into another category. */
1200static void i915_capture_reg_state(struct drm_i915_private *dev_priv,
1201 struct drm_i915_error_state *error)
1202{
1203 struct drm_device *dev = dev_priv->dev;
1204 int i;
1205
1206 /* General organization
1207 * 1. Registers specific to a single generation
1208 * 2. Registers which belong to multiple generations
1209 * 3. Feature specific registers.
1210 * 4. Everything else
1211 * Please try to follow the order.
1212 */
1213
1214 /* 1: Registers specific to a single generation */
1215 if (IS_VALLEYVIEW(dev)) {
1216 error->gtier[0] = I915_READ(GTIER);
1217 error->ier = I915_READ(VLV_IER);
1218 error->forcewake = I915_READ_FW(FORCEWAKE_VLV);
1219 }
1220
1221 if (IS_GEN7(dev))
1222 error->err_int = I915_READ(GEN7_ERR_INT);
1223
1224 if (INTEL_INFO(dev)->gen >= 8) {
1225 error->fault_data0 = I915_READ(GEN8_FAULT_TLB_DATA0);
1226 error->fault_data1 = I915_READ(GEN8_FAULT_TLB_DATA1);
1227 }
1228
1229 if (IS_GEN6(dev)) {
1230 error->forcewake = I915_READ_FW(FORCEWAKE);
1231 error->gab_ctl = I915_READ(GAB_CTL);
1232 error->gfx_mode = I915_READ(GFX_MODE);
1233 }
1234
1235 /* 2: Registers which belong to multiple generations */
1236 if (INTEL_INFO(dev)->gen >= 7)
1237 error->forcewake = I915_READ_FW(FORCEWAKE_MT);
1238
1239 if (INTEL_INFO(dev)->gen >= 6) {
1240 error->derrmr = I915_READ(DERRMR);
1241 error->error = I915_READ(ERROR_GEN6);
1242 error->done_reg = I915_READ(DONE_REG);
1243 }
1244
1245 /* 3: Feature specific registers */
1246 if (IS_GEN6(dev) || IS_GEN7(dev)) {
1247 error->gam_ecochk = I915_READ(GAM_ECOCHK);
1248 error->gac_eco = I915_READ(GAC_ECO_BITS);
1249 }
1250
1251 /* 4: Everything else */
1252 if (HAS_HW_CONTEXTS(dev))
1253 error->ccid = I915_READ(CCID);
1254
1255 if (INTEL_INFO(dev)->gen >= 8) {
1256 error->ier = I915_READ(GEN8_DE_MISC_IER);
1257 for (i = 0; i < 4; i++)
1258 error->gtier[i] = I915_READ(GEN8_GT_IER(i));
1259 } else if (HAS_PCH_SPLIT(dev)) {
1260 error->ier = I915_READ(DEIER);
1261 error->gtier[0] = I915_READ(GTIER);
1262 } else if (IS_GEN2(dev)) {
1263 error->ier = I915_READ16(IER);
1264 } else if (!IS_VALLEYVIEW(dev)) {
1265 error->ier = I915_READ(IER);
1266 }
1267 error->eir = I915_READ(EIR);
1268 error->pgtbl_er = I915_READ(PGTBL_ER);
1269
1270 i915_get_extra_instdone(dev, error->extra_instdone);
1271}
1272
1273static void i915_error_capture_msg(struct drm_device *dev,
1274 struct drm_i915_error_state *error,
1275 bool wedged,
1276 const char *error_msg)
1277{
1278 struct drm_i915_private *dev_priv = dev->dev_private;
1279 u32 ecode;
1280 int ring_id = -1, len;
1281
1282 ecode = i915_error_generate_code(dev_priv, error, &ring_id);
1283
1284 len = scnprintf(error->error_msg, sizeof(error->error_msg),
1285 "GPU HANG: ecode %d:%d:0x%08x",
1286 INTEL_INFO(dev)->gen, ring_id, ecode);
1287
1288 if (ring_id != -1 && error->ring[ring_id].pid != -1)
1289 len += scnprintf(error->error_msg + len,
1290 sizeof(error->error_msg) - len,
1291 ", in %s [%d]",
1292 error->ring[ring_id].comm,
1293 error->ring[ring_id].pid);
1294
1295 scnprintf(error->error_msg + len, sizeof(error->error_msg) - len,
1296 ", reason: %s, action: %s",
1297 error_msg,
1298 wedged ? "reset" : "continue");
1299}
1300
1301static void i915_capture_gen_state(struct drm_i915_private *dev_priv,
1302 struct drm_i915_error_state *error)
1303{
1304 error->iommu = -1;
1305#ifdef CONFIG_INTEL_IOMMU
1306 error->iommu = intel_iommu_gfx_mapped;
1307#endif
1308 error->reset_count = i915_reset_count(&dev_priv->gpu_error);
1309 error->suspend_count = dev_priv->suspend_count;
1310}
1311
1312/**
1313 * i915_capture_error_state - capture an error record for later analysis
1314 * @dev: drm device
1315 *
1316 * Should be called when an error is detected (either a hang or an error
1317 * interrupt) to capture error state from the time of the error. Fills
1318 * out a structure which becomes available in debugfs for user level tools
1319 * to pick up.
1320 */
1321void i915_capture_error_state(struct drm_device *dev, bool wedged,
1322 const char *error_msg)
1323{
1324 static bool warned;
1325 struct drm_i915_private *dev_priv = dev->dev_private;
1326 struct drm_i915_error_state *error;
1327 unsigned long flags;
1328
1329 /* Account for pipe specific data like PIPE*STAT */
1330 error = kzalloc(sizeof(*error), GFP_ATOMIC);
1331 if (!error) {
1332 DRM_DEBUG_DRIVER("out of memory, not capturing error state\n");
1333 return;
1334 }
1335
1336 kref_init(&error->ref);
1337
1338 i915_capture_gen_state(dev_priv, error);
1339 i915_capture_reg_state(dev_priv, error);
1340 i915_gem_capture_buffers(dev_priv, error);
1341 i915_gem_record_fences(dev, error);
1342 i915_gem_record_rings(dev, error);
1343
1344 do_gettimeofday(&error->time);
1345
1346 error->overlay = intel_overlay_capture_error_state(dev);
1347 error->display = intel_display_capture_error_state(dev);
1348
1349 i915_error_capture_msg(dev, error, wedged, error_msg);
1350 DRM_INFO("%s\n", error->error_msg);
1351
1352 spin_lock_irqsave(&dev_priv->gpu_error.lock, flags);
1353 if (dev_priv->gpu_error.first_error == NULL) {
1354 dev_priv->gpu_error.first_error = error;
1355 error = NULL;
1356 }
1357 spin_unlock_irqrestore(&dev_priv->gpu_error.lock, flags);
1358
1359 if (error) {
1360 i915_error_state_free(&error->ref);
1361 return;
1362 }
1363
1364 if (!warned) {
1365 DRM_INFO("GPU hangs can indicate a bug anywhere in the entire gfx stack, including userspace.\n");
1366 DRM_INFO("Please file a _new_ bug report on bugs.freedesktop.org against DRI -> DRM/Intel\n");
1367 DRM_INFO("drm/i915 developers can then reassign to the right component if it's not a kernel issue.\n");
1368 DRM_INFO("The gpu crash dump is required to analyze gpu hangs, so please always attach it.\n");
1369 DRM_INFO("GPU crash dump saved to /sys/class/drm/card%d/error\n", dev->primary->index);
1370 warned = true;
1371 }
1372}
1373
1374void i915_error_state_get(struct drm_device *dev,
1375 struct i915_error_state_file_priv *error_priv)
1376{
1377 struct drm_i915_private *dev_priv = dev->dev_private;
1378
1379 spin_lock_irq(&dev_priv->gpu_error.lock);
1380 error_priv->error = dev_priv->gpu_error.first_error;
1381 if (error_priv->error)
1382 kref_get(&error_priv->error->ref);
1383 spin_unlock_irq(&dev_priv->gpu_error.lock);
1384
1385}
1386
1387void i915_error_state_put(struct i915_error_state_file_priv *error_priv)
1388{
1389 if (error_priv->error)
1390 kref_put(&error_priv->error->ref, i915_error_state_free);
1391}
1392
1393void i915_destroy_error_state(struct drm_device *dev)
1394{
1395 struct drm_i915_private *dev_priv = dev->dev_private;
1396 struct drm_i915_error_state *error;
1397
1398 spin_lock_irq(&dev_priv->gpu_error.lock);
1399 error = dev_priv->gpu_error.first_error;
1400 dev_priv->gpu_error.first_error = NULL;
1401 spin_unlock_irq(&dev_priv->gpu_error.lock);
1402
1403 if (error)
1404 kref_put(&error->ref, i915_error_state_free);
1405}
1406
1407const char *i915_cache_level_str(struct drm_i915_private *i915, int type)
1408{
1409 switch (type) {
1410 case I915_CACHE_NONE: return " uncached";
1411 case I915_CACHE_LLC: return HAS_LLC(i915) ? " LLC" : " snooped";
1412 case I915_CACHE_L3_LLC: return " L3+LLC";
1413 case I915_CACHE_WT: return " WT";
1414 default: return "";
1415 }
1416}
1417
1418/* NB: please notice the memset */
1419void i915_get_extra_instdone(struct drm_device *dev, uint32_t *instdone)
1420{
1421 struct drm_i915_private *dev_priv = dev->dev_private;
1422 memset(instdone, 0, sizeof(*instdone) * I915_NUM_INSTDONE_REG);
1423
1424 if (IS_GEN2(dev) || IS_GEN3(dev))
1425 instdone[0] = I915_READ(GEN2_INSTDONE);
1426 else if (IS_GEN4(dev) || IS_GEN5(dev) || IS_GEN6(dev)) {
1427 instdone[0] = I915_READ(RING_INSTDONE(RENDER_RING_BASE));
1428 instdone[1] = I915_READ(GEN4_INSTDONE1);
1429 } else if (INTEL_INFO(dev)->gen >= 7) {
1430 instdone[0] = I915_READ(RING_INSTDONE(RENDER_RING_BASE));
1431 instdone[1] = I915_READ(GEN7_SC_INSTDONE);
1432 instdone[2] = I915_READ(GEN7_SAMPLER_INSTDONE);
1433 instdone[3] = I915_READ(GEN7_ROW_INSTDONE);
1434 }
1435}
1/*
2 * Copyright (c) 2008 Intel Corporation
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21 * IN THE SOFTWARE.
22 *
23 * Authors:
24 * Eric Anholt <eric@anholt.net>
25 * Keith Packard <keithp@keithp.com>
26 * Mika Kuoppala <mika.kuoppala@intel.com>
27 *
28 */
29
30#include <linux/ascii85.h>
31#include <linux/debugfs.h>
32#include <linux/highmem.h>
33#include <linux/nmi.h>
34#include <linux/pagevec.h>
35#include <linux/scatterlist.h>
36#include <linux/string_helpers.h>
37#include <linux/utsname.h>
38#include <linux/zlib.h>
39
40#include <drm/drm_cache.h>
41#include <drm/drm_print.h>
42
43#include "display/intel_display_snapshot.h"
44
45#include "gem/i915_gem_context.h"
46#include "gem/i915_gem_lmem.h"
47#include "gt/intel_engine_regs.h"
48#include "gt/intel_gt.h"
49#include "gt/intel_gt_mcr.h"
50#include "gt/intel_gt_pm.h"
51#include "gt/intel_gt_regs.h"
52#include "gt/uc/intel_guc_capture.h"
53
54#include "i915_driver.h"
55#include "i915_drv.h"
56#include "i915_gpu_error.h"
57#include "i915_memcpy.h"
58#include "i915_reg.h"
59#include "i915_scatterlist.h"
60#include "i915_sysfs.h"
61#include "i915_utils.h"
62
63#define ALLOW_FAIL (__GFP_KSWAPD_RECLAIM | __GFP_RETRY_MAYFAIL | __GFP_NOWARN)
64#define ATOMIC_MAYFAIL (GFP_ATOMIC | __GFP_NOWARN)
65
66static void __sg_set_buf(struct scatterlist *sg,
67 void *addr, unsigned int len, loff_t it)
68{
69 sg->page_link = (unsigned long)virt_to_page(addr);
70 sg->offset = offset_in_page(addr);
71 sg->length = len;
72 sg->dma_address = it;
73}
74
75static bool __i915_error_grow(struct drm_i915_error_state_buf *e, size_t len)
76{
77 if (!len)
78 return false;
79
80 if (e->bytes + len + 1 <= e->size)
81 return true;
82
83 if (e->bytes) {
84 __sg_set_buf(e->cur++, e->buf, e->bytes, e->iter);
85 e->iter += e->bytes;
86 e->buf = NULL;
87 e->bytes = 0;
88 }
89
90 if (e->cur == e->end) {
91 struct scatterlist *sgl;
92
93 sgl = (typeof(sgl))__get_free_page(ALLOW_FAIL);
94 if (!sgl) {
95 e->err = -ENOMEM;
96 return false;
97 }
98
99 if (e->cur) {
100 e->cur->offset = 0;
101 e->cur->length = 0;
102 e->cur->page_link =
103 (unsigned long)sgl | SG_CHAIN;
104 } else {
105 e->sgl = sgl;
106 }
107
108 e->cur = sgl;
109 e->end = sgl + SG_MAX_SINGLE_ALLOC - 1;
110 }
111
112 e->size = ALIGN(len + 1, SZ_64K);
113 e->buf = kmalloc(e->size, ALLOW_FAIL);
114 if (!e->buf) {
115 e->size = PAGE_ALIGN(len + 1);
116 e->buf = kmalloc(e->size, GFP_KERNEL);
117 }
118 if (!e->buf) {
119 e->err = -ENOMEM;
120 return false;
121 }
122
123 return true;
124}
125
126__printf(2, 0)
127static void i915_error_vprintf(struct drm_i915_error_state_buf *e,
128 const char *fmt, va_list args)
129{
130 va_list ap;
131 int len;
132
133 if (e->err)
134 return;
135
136 va_copy(ap, args);
137 len = vsnprintf(NULL, 0, fmt, ap);
138 va_end(ap);
139 if (len <= 0) {
140 e->err = len;
141 return;
142 }
143
144 if (!__i915_error_grow(e, len))
145 return;
146
147 GEM_BUG_ON(e->bytes >= e->size);
148 len = vscnprintf(e->buf + e->bytes, e->size - e->bytes, fmt, args);
149 if (len < 0) {
150 e->err = len;
151 return;
152 }
153 e->bytes += len;
154}
155
156static void i915_error_puts(struct drm_i915_error_state_buf *e, const char *str)
157{
158 unsigned len;
159
160 if (e->err || !str)
161 return;
162
163 len = strlen(str);
164 if (!__i915_error_grow(e, len))
165 return;
166
167 GEM_BUG_ON(e->bytes + len > e->size);
168 memcpy(e->buf + e->bytes, str, len);
169 e->bytes += len;
170}
171
172#define err_printf(e, ...) i915_error_printf(e, __VA_ARGS__)
173#define err_puts(e, s) i915_error_puts(e, s)
174
175static void __i915_printfn_error(struct drm_printer *p, struct va_format *vaf)
176{
177 i915_error_vprintf(p->arg, vaf->fmt, *vaf->va);
178}
179
180static inline struct drm_printer
181i915_error_printer(struct drm_i915_error_state_buf *e)
182{
183 struct drm_printer p = {
184 .printfn = __i915_printfn_error,
185 .arg = e,
186 };
187 return p;
188}
189
190/* single threaded page allocator with a reserved stash for emergencies */
191static void pool_fini(struct folio_batch *fbatch)
192{
193 folio_batch_release(fbatch);
194}
195
196static int pool_refill(struct folio_batch *fbatch, gfp_t gfp)
197{
198 while (folio_batch_space(fbatch)) {
199 struct folio *folio;
200
201 folio = folio_alloc(gfp, 0);
202 if (!folio)
203 return -ENOMEM;
204
205 folio_batch_add(fbatch, folio);
206 }
207
208 return 0;
209}
210
211static int pool_init(struct folio_batch *fbatch, gfp_t gfp)
212{
213 int err;
214
215 folio_batch_init(fbatch);
216
217 err = pool_refill(fbatch, gfp);
218 if (err)
219 pool_fini(fbatch);
220
221 return err;
222}
223
224static void *pool_alloc(struct folio_batch *fbatch, gfp_t gfp)
225{
226 struct folio *folio;
227
228 folio = folio_alloc(gfp, 0);
229 if (!folio && folio_batch_count(fbatch))
230 folio = fbatch->folios[--fbatch->nr];
231
232 return folio ? folio_address(folio) : NULL;
233}
234
235static void pool_free(struct folio_batch *fbatch, void *addr)
236{
237 struct folio *folio = virt_to_folio(addr);
238
239 if (folio_batch_space(fbatch))
240 folio_batch_add(fbatch, folio);
241 else
242 folio_put(folio);
243}
244
245#ifdef CONFIG_DRM_I915_COMPRESS_ERROR
246
247struct i915_vma_compress {
248 struct folio_batch pool;
249 struct z_stream_s zstream;
250 void *tmp;
251};
252
253static bool compress_init(struct i915_vma_compress *c)
254{
255 struct z_stream_s *zstream = &c->zstream;
256
257 if (pool_init(&c->pool, ALLOW_FAIL))
258 return false;
259
260 zstream->workspace =
261 kmalloc(zlib_deflate_workspacesize(MAX_WBITS, MAX_MEM_LEVEL),
262 ALLOW_FAIL);
263 if (!zstream->workspace) {
264 pool_fini(&c->pool);
265 return false;
266 }
267
268 c->tmp = NULL;
269 if (i915_has_memcpy_from_wc())
270 c->tmp = pool_alloc(&c->pool, ALLOW_FAIL);
271
272 return true;
273}
274
275static bool compress_start(struct i915_vma_compress *c)
276{
277 struct z_stream_s *zstream = &c->zstream;
278 void *workspace = zstream->workspace;
279
280 memset(zstream, 0, sizeof(*zstream));
281 zstream->workspace = workspace;
282
283 return zlib_deflateInit(zstream, Z_DEFAULT_COMPRESSION) == Z_OK;
284}
285
286static void *compress_next_page(struct i915_vma_compress *c,
287 struct i915_vma_coredump *dst)
288{
289 void *page_addr;
290 struct page *page;
291
292 page_addr = pool_alloc(&c->pool, ALLOW_FAIL);
293 if (!page_addr)
294 return ERR_PTR(-ENOMEM);
295
296 page = virt_to_page(page_addr);
297 list_add_tail(&page->lru, &dst->page_list);
298 return page_addr;
299}
300
301static int compress_page(struct i915_vma_compress *c,
302 void *src,
303 struct i915_vma_coredump *dst,
304 bool wc)
305{
306 struct z_stream_s *zstream = &c->zstream;
307
308 zstream->next_in = src;
309 if (wc && c->tmp && i915_memcpy_from_wc(c->tmp, src, PAGE_SIZE))
310 zstream->next_in = c->tmp;
311 zstream->avail_in = PAGE_SIZE;
312
313 do {
314 if (zstream->avail_out == 0) {
315 zstream->next_out = compress_next_page(c, dst);
316 if (IS_ERR(zstream->next_out))
317 return PTR_ERR(zstream->next_out);
318
319 zstream->avail_out = PAGE_SIZE;
320 }
321
322 if (zlib_deflate(zstream, Z_NO_FLUSH) != Z_OK)
323 return -EIO;
324
325 cond_resched();
326 } while (zstream->avail_in);
327
328 /* Fallback to uncompressed if we increase size? */
329 if (0 && zstream->total_out > zstream->total_in)
330 return -E2BIG;
331
332 return 0;
333}
334
335static int compress_flush(struct i915_vma_compress *c,
336 struct i915_vma_coredump *dst)
337{
338 struct z_stream_s *zstream = &c->zstream;
339
340 do {
341 switch (zlib_deflate(zstream, Z_FINISH)) {
342 case Z_OK: /* more space requested */
343 zstream->next_out = compress_next_page(c, dst);
344 if (IS_ERR(zstream->next_out))
345 return PTR_ERR(zstream->next_out);
346
347 zstream->avail_out = PAGE_SIZE;
348 break;
349
350 case Z_STREAM_END:
351 goto end;
352
353 default: /* any error */
354 return -EIO;
355 }
356 } while (1);
357
358end:
359 memset(zstream->next_out, 0, zstream->avail_out);
360 dst->unused = zstream->avail_out;
361 return 0;
362}
363
364static void compress_finish(struct i915_vma_compress *c)
365{
366 zlib_deflateEnd(&c->zstream);
367}
368
369static void compress_fini(struct i915_vma_compress *c)
370{
371 kfree(c->zstream.workspace);
372 if (c->tmp)
373 pool_free(&c->pool, c->tmp);
374 pool_fini(&c->pool);
375}
376
377static void err_compression_marker(struct drm_i915_error_state_buf *m)
378{
379 err_puts(m, ":");
380}
381
382#else
383
384struct i915_vma_compress {
385 struct folio_batch pool;
386};
387
388static bool compress_init(struct i915_vma_compress *c)
389{
390 return pool_init(&c->pool, ALLOW_FAIL) == 0;
391}
392
393static bool compress_start(struct i915_vma_compress *c)
394{
395 return true;
396}
397
398static int compress_page(struct i915_vma_compress *c,
399 void *src,
400 struct i915_vma_coredump *dst,
401 bool wc)
402{
403 void *ptr;
404
405 ptr = pool_alloc(&c->pool, ALLOW_FAIL);
406 if (!ptr)
407 return -ENOMEM;
408
409 if (!(wc && i915_memcpy_from_wc(ptr, src, PAGE_SIZE)))
410 memcpy(ptr, src, PAGE_SIZE);
411 list_add_tail(&virt_to_page(ptr)->lru, &dst->page_list);
412 cond_resched();
413
414 return 0;
415}
416
417static int compress_flush(struct i915_vma_compress *c,
418 struct i915_vma_coredump *dst)
419{
420 return 0;
421}
422
423static void compress_finish(struct i915_vma_compress *c)
424{
425}
426
427static void compress_fini(struct i915_vma_compress *c)
428{
429 pool_fini(&c->pool);
430}
431
432static void err_compression_marker(struct drm_i915_error_state_buf *m)
433{
434 err_puts(m, "~");
435}
436
437#endif
438
439static void error_print_instdone(struct drm_i915_error_state_buf *m,
440 const struct intel_engine_coredump *ee)
441{
442 int slice;
443 int subslice;
444 int iter;
445
446 err_printf(m, " INSTDONE: 0x%08x\n",
447 ee->instdone.instdone);
448
449 if (ee->engine->class != RENDER_CLASS || GRAPHICS_VER(m->i915) <= 3)
450 return;
451
452 err_printf(m, " SC_INSTDONE: 0x%08x\n",
453 ee->instdone.slice_common);
454
455 if (GRAPHICS_VER(m->i915) <= 6)
456 return;
457
458 for_each_ss_steering(iter, ee->engine->gt, slice, subslice)
459 err_printf(m, " SAMPLER_INSTDONE[%d][%d]: 0x%08x\n",
460 slice, subslice,
461 ee->instdone.sampler[slice][subslice]);
462
463 for_each_ss_steering(iter, ee->engine->gt, slice, subslice)
464 err_printf(m, " ROW_INSTDONE[%d][%d]: 0x%08x\n",
465 slice, subslice,
466 ee->instdone.row[slice][subslice]);
467
468 if (GRAPHICS_VER(m->i915) < 12)
469 return;
470
471 if (GRAPHICS_VER_FULL(m->i915) >= IP_VER(12, 55)) {
472 for_each_ss_steering(iter, ee->engine->gt, slice, subslice)
473 err_printf(m, " GEOM_SVGUNIT_INSTDONE[%d][%d]: 0x%08x\n",
474 slice, subslice,
475 ee->instdone.geom_svg[slice][subslice]);
476 }
477
478 err_printf(m, " SC_INSTDONE_EXTRA: 0x%08x\n",
479 ee->instdone.slice_common_extra[0]);
480 err_printf(m, " SC_INSTDONE_EXTRA2: 0x%08x\n",
481 ee->instdone.slice_common_extra[1]);
482}
483
484static void error_print_request(struct drm_i915_error_state_buf *m,
485 const char *prefix,
486 const struct i915_request_coredump *erq)
487{
488 if (!erq->seqno)
489 return;
490
491 err_printf(m, "%s pid %d, seqno %8x:%08x%s%s, prio %d, head %08x, tail %08x\n",
492 prefix, erq->pid, erq->context, erq->seqno,
493 test_bit(DMA_FENCE_FLAG_SIGNALED_BIT,
494 &erq->flags) ? "!" : "",
495 test_bit(DMA_FENCE_FLAG_ENABLE_SIGNAL_BIT,
496 &erq->flags) ? "+" : "",
497 erq->sched_attr.priority,
498 erq->head, erq->tail);
499}
500
501static void error_print_context(struct drm_i915_error_state_buf *m,
502 const char *header,
503 const struct i915_gem_context_coredump *ctx)
504{
505 err_printf(m, "%s%s[%d] prio %d, guilty %d active %d, runtime total %lluns, avg %lluns\n",
506 header, ctx->comm, ctx->pid, ctx->sched_attr.priority,
507 ctx->guilty, ctx->active,
508 ctx->total_runtime, ctx->avg_runtime);
509 err_printf(m, " context timeline seqno %u\n", ctx->hwsp_seqno);
510}
511
512static struct i915_vma_coredump *
513__find_vma(struct i915_vma_coredump *vma, const char *name)
514{
515 while (vma) {
516 if (strcmp(vma->name, name) == 0)
517 return vma;
518 vma = vma->next;
519 }
520
521 return NULL;
522}
523
524static struct i915_vma_coredump *
525intel_gpu_error_find_batch(const struct intel_engine_coredump *ee)
526{
527 return __find_vma(ee->vma, "batch");
528}
529
530static void error_print_engine(struct drm_i915_error_state_buf *m,
531 const struct intel_engine_coredump *ee)
532{
533 struct i915_vma_coredump *batch;
534 int n;
535
536 err_printf(m, "%s command stream:\n", ee->engine->name);
537 err_printf(m, " CCID: 0x%08x\n", ee->ccid);
538 err_printf(m, " START: 0x%08x\n", ee->start);
539 err_printf(m, " HEAD: 0x%08x [0x%08x]\n", ee->head, ee->rq_head);
540 err_printf(m, " TAIL: 0x%08x [0x%08x, 0x%08x]\n",
541 ee->tail, ee->rq_post, ee->rq_tail);
542 err_printf(m, " CTL: 0x%08x\n", ee->ctl);
543 err_printf(m, " MODE: 0x%08x\n", ee->mode);
544 err_printf(m, " HWS: 0x%08x\n", ee->hws);
545 err_printf(m, " ACTHD: 0x%08x %08x\n",
546 (u32)(ee->acthd>>32), (u32)ee->acthd);
547 err_printf(m, " IPEIR: 0x%08x\n", ee->ipeir);
548 err_printf(m, " IPEHR: 0x%08x\n", ee->ipehr);
549 err_printf(m, " ESR: 0x%08x\n", ee->esr);
550
551 error_print_instdone(m, ee);
552
553 batch = intel_gpu_error_find_batch(ee);
554 if (batch) {
555 u64 start = batch->gtt_offset;
556 u64 end = start + batch->gtt_size;
557
558 err_printf(m, " batch: [0x%08x_%08x, 0x%08x_%08x]\n",
559 upper_32_bits(start), lower_32_bits(start),
560 upper_32_bits(end), lower_32_bits(end));
561 }
562 if (GRAPHICS_VER(m->i915) >= 4) {
563 err_printf(m, " BBADDR: 0x%08x_%08x\n",
564 (u32)(ee->bbaddr>>32), (u32)ee->bbaddr);
565 err_printf(m, " BB_STATE: 0x%08x\n", ee->bbstate);
566 err_printf(m, " INSTPS: 0x%08x\n", ee->instps);
567 }
568 err_printf(m, " INSTPM: 0x%08x\n", ee->instpm);
569 err_printf(m, " FADDR: 0x%08x %08x\n", upper_32_bits(ee->faddr),
570 lower_32_bits(ee->faddr));
571 if (GRAPHICS_VER(m->i915) >= 6) {
572 err_printf(m, " RC PSMI: 0x%08x\n", ee->rc_psmi);
573 err_printf(m, " FAULT_REG: 0x%08x\n", ee->fault_reg);
574 }
575 if (GRAPHICS_VER(m->i915) >= 11) {
576 err_printf(m, " NOPID: 0x%08x\n", ee->nopid);
577 err_printf(m, " EXCC: 0x%08x\n", ee->excc);
578 err_printf(m, " CMD_CCTL: 0x%08x\n", ee->cmd_cctl);
579 err_printf(m, " CSCMDOP: 0x%08x\n", ee->cscmdop);
580 err_printf(m, " CTX_SR_CTL: 0x%08x\n", ee->ctx_sr_ctl);
581 err_printf(m, " DMA_FADDR_HI: 0x%08x\n", ee->dma_faddr_hi);
582 err_printf(m, " DMA_FADDR_LO: 0x%08x\n", ee->dma_faddr_lo);
583 }
584 if (HAS_PPGTT(m->i915)) {
585 err_printf(m, " GFX_MODE: 0x%08x\n", ee->vm_info.gfx_mode);
586
587 if (GRAPHICS_VER(m->i915) >= 8) {
588 int i;
589 for (i = 0; i < 4; i++)
590 err_printf(m, " PDP%d: 0x%016llx\n",
591 i, ee->vm_info.pdp[i]);
592 } else {
593 err_printf(m, " PP_DIR_BASE: 0x%08x\n",
594 ee->vm_info.pp_dir_base);
595 }
596 }
597
598 for (n = 0; n < ee->num_ports; n++) {
599 err_printf(m, " ELSP[%d]:", n);
600 error_print_request(m, " ", &ee->execlist[n]);
601 }
602}
603
604void i915_error_printf(struct drm_i915_error_state_buf *e, const char *f, ...)
605{
606 va_list args;
607
608 va_start(args, f);
609 i915_error_vprintf(e, f, args);
610 va_end(args);
611}
612
613static void intel_gpu_error_print_vma(struct drm_i915_error_state_buf *m,
614 const struct intel_engine_cs *engine,
615 const struct i915_vma_coredump *vma)
616{
617 char out[ASCII85_BUFSZ];
618 struct page *page;
619
620 if (!vma)
621 return;
622
623 err_printf(m, "%s --- %s = 0x%08x %08x\n",
624 engine ? engine->name : "global", vma->name,
625 upper_32_bits(vma->gtt_offset),
626 lower_32_bits(vma->gtt_offset));
627
628 if (vma->gtt_page_sizes > I915_GTT_PAGE_SIZE_4K)
629 err_printf(m, "gtt_page_sizes = 0x%08x\n", vma->gtt_page_sizes);
630
631 err_compression_marker(m);
632 list_for_each_entry(page, &vma->page_list, lru) {
633 int i, len;
634 const u32 *addr = page_address(page);
635
636 len = PAGE_SIZE;
637 if (page == list_last_entry(&vma->page_list, typeof(*page), lru))
638 len -= vma->unused;
639 len = ascii85_encode_len(len);
640
641 for (i = 0; i < len; i++)
642 err_puts(m, ascii85_encode(addr[i], out));
643 }
644 err_puts(m, "\n");
645}
646
647static void err_print_capabilities(struct drm_i915_error_state_buf *m,
648 struct i915_gpu_coredump *error)
649{
650 struct drm_printer p = i915_error_printer(m);
651
652 intel_device_info_print(&error->device_info, &error->runtime_info, &p);
653 intel_driver_caps_print(&error->driver_caps, &p);
654}
655
656static void err_print_params(struct drm_i915_error_state_buf *m,
657 const struct i915_params *params)
658{
659 struct drm_printer p = i915_error_printer(m);
660
661 i915_params_dump(params, &p);
662}
663
664static void err_print_pciid(struct drm_i915_error_state_buf *m,
665 struct drm_i915_private *i915)
666{
667 struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
668
669 err_printf(m, "PCI ID: 0x%04x\n", pdev->device);
670 err_printf(m, "PCI Revision: 0x%02x\n", pdev->revision);
671 err_printf(m, "PCI Subsystem: %04x:%04x\n",
672 pdev->subsystem_vendor,
673 pdev->subsystem_device);
674}
675
676static void err_print_guc_ctb(struct drm_i915_error_state_buf *m,
677 const char *name,
678 const struct intel_ctb_coredump *ctb)
679{
680 if (!ctb->size)
681 return;
682
683 err_printf(m, "GuC %s CTB: raw: 0x%08X, 0x%08X/%08X, cached: 0x%08X/%08X, desc = 0x%08X, buf = 0x%08X x 0x%08X\n",
684 name, ctb->raw_status, ctb->raw_head, ctb->raw_tail,
685 ctb->head, ctb->tail, ctb->desc_offset, ctb->cmds_offset, ctb->size);
686}
687
688static void err_print_uc(struct drm_i915_error_state_buf *m,
689 const struct intel_uc_coredump *error_uc)
690{
691 struct drm_printer p = i915_error_printer(m);
692
693 intel_uc_fw_dump(&error_uc->guc_fw, &p);
694 intel_uc_fw_dump(&error_uc->huc_fw, &p);
695 err_printf(m, "GuC timestamp: 0x%08x\n", error_uc->guc.timestamp);
696 intel_gpu_error_print_vma(m, NULL, error_uc->guc.vma_log);
697 err_printf(m, "GuC CTB fence: %d\n", error_uc->guc.last_fence);
698 err_print_guc_ctb(m, "Send", error_uc->guc.ctb + 0);
699 err_print_guc_ctb(m, "Recv", error_uc->guc.ctb + 1);
700 intel_gpu_error_print_vma(m, NULL, error_uc->guc.vma_ctb);
701}
702
703static void err_free_sgl(struct scatterlist *sgl)
704{
705 while (sgl) {
706 struct scatterlist *sg;
707
708 for (sg = sgl; !sg_is_chain(sg); sg++) {
709 kfree(sg_virt(sg));
710 if (sg_is_last(sg))
711 break;
712 }
713
714 sg = sg_is_last(sg) ? NULL : sg_chain_ptr(sg);
715 free_page((unsigned long)sgl);
716 sgl = sg;
717 }
718}
719
720static void err_print_gt_info(struct drm_i915_error_state_buf *m,
721 struct intel_gt_coredump *gt)
722{
723 struct drm_printer p = i915_error_printer(m);
724
725 intel_gt_info_print(>->info, &p);
726 intel_sseu_print_topology(gt->_gt->i915, >->info.sseu, &p);
727}
728
729static void err_print_gt_display(struct drm_i915_error_state_buf *m,
730 struct intel_gt_coredump *gt)
731{
732 err_printf(m, "IER: 0x%08x\n", gt->ier);
733 err_printf(m, "DERRMR: 0x%08x\n", gt->derrmr);
734}
735
736static void err_print_gt_global_nonguc(struct drm_i915_error_state_buf *m,
737 struct intel_gt_coredump *gt)
738{
739 int i;
740
741 err_printf(m, "GT awake: %s\n", str_yes_no(gt->awake));
742 err_printf(m, "CS timestamp frequency: %u Hz, %d ns\n",
743 gt->clock_frequency, gt->clock_period_ns);
744 err_printf(m, "EIR: 0x%08x\n", gt->eir);
745 err_printf(m, "PGTBL_ER: 0x%08x\n", gt->pgtbl_er);
746
747 for (i = 0; i < gt->ngtier; i++)
748 err_printf(m, "GTIER[%d]: 0x%08x\n", i, gt->gtier[i]);
749}
750
751static void err_print_gt_global(struct drm_i915_error_state_buf *m,
752 struct intel_gt_coredump *gt)
753{
754 err_printf(m, "FORCEWAKE: 0x%08x\n", gt->forcewake);
755
756 if (IS_GRAPHICS_VER(m->i915, 6, 11)) {
757 err_printf(m, "ERROR: 0x%08x\n", gt->error);
758 err_printf(m, "DONE_REG: 0x%08x\n", gt->done_reg);
759 }
760
761 if (GRAPHICS_VER(m->i915) >= 8)
762 err_printf(m, "FAULT_TLB_DATA: 0x%08x 0x%08x\n",
763 gt->fault_data1, gt->fault_data0);
764
765 if (GRAPHICS_VER(m->i915) == 7)
766 err_printf(m, "ERR_INT: 0x%08x\n", gt->err_int);
767
768 if (IS_GRAPHICS_VER(m->i915, 8, 11))
769 err_printf(m, "GTT_CACHE_EN: 0x%08x\n", gt->gtt_cache);
770
771 if (GRAPHICS_VER(m->i915) == 12)
772 err_printf(m, "AUX_ERR_DBG: 0x%08x\n", gt->aux_err);
773
774 if (GRAPHICS_VER(m->i915) >= 12) {
775 int i;
776
777 for (i = 0; i < I915_MAX_SFC; i++) {
778 /*
779 * SFC_DONE resides in the VD forcewake domain, so it
780 * only exists if the corresponding VCS engine is
781 * present.
782 */
783 if ((gt->_gt->info.sfc_mask & BIT(i)) == 0 ||
784 !HAS_ENGINE(gt->_gt, _VCS(i * 2)))
785 continue;
786
787 err_printf(m, " SFC_DONE[%d]: 0x%08x\n", i,
788 gt->sfc_done[i]);
789 }
790
791 err_printf(m, " GAM_DONE: 0x%08x\n", gt->gam_done);
792 }
793}
794
795static void err_print_gt_fences(struct drm_i915_error_state_buf *m,
796 struct intel_gt_coredump *gt)
797{
798 int i;
799
800 for (i = 0; i < gt->nfence; i++)
801 err_printf(m, " fence[%d] = %08llx\n", i, gt->fence[i]);
802}
803
804static void err_print_gt_engines(struct drm_i915_error_state_buf *m,
805 struct intel_gt_coredump *gt)
806{
807 const struct intel_engine_coredump *ee;
808
809 for (ee = gt->engine; ee; ee = ee->next) {
810 const struct i915_vma_coredump *vma;
811
812 if (gt->uc && gt->uc->guc.is_guc_capture) {
813 if (ee->guc_capture_node)
814 intel_guc_capture_print_engine_node(m, ee);
815 else
816 err_printf(m, " Missing GuC capture node for %s\n",
817 ee->engine->name);
818 } else {
819 error_print_engine(m, ee);
820 }
821
822 err_printf(m, " hung: %u\n", ee->hung);
823 err_printf(m, " engine reset count: %u\n", ee->reset_count);
824 error_print_context(m, " Active context: ", &ee->context);
825
826 for (vma = ee->vma; vma; vma = vma->next)
827 intel_gpu_error_print_vma(m, ee->engine, vma);
828 }
829
830}
831
832static void __err_print_to_sgl(struct drm_i915_error_state_buf *m,
833 struct i915_gpu_coredump *error)
834{
835 struct drm_printer p = i915_error_printer(m);
836 const struct intel_engine_coredump *ee;
837 struct timespec64 ts;
838
839 if (*error->error_msg)
840 err_printf(m, "%s\n", error->error_msg);
841 err_printf(m, "Kernel: %s %s\n",
842 init_utsname()->release,
843 init_utsname()->machine);
844 err_printf(m, "Driver: %s\n", DRIVER_DATE);
845 ts = ktime_to_timespec64(error->time);
846 err_printf(m, "Time: %lld s %ld us\n",
847 (s64)ts.tv_sec, ts.tv_nsec / NSEC_PER_USEC);
848 ts = ktime_to_timespec64(error->boottime);
849 err_printf(m, "Boottime: %lld s %ld us\n",
850 (s64)ts.tv_sec, ts.tv_nsec / NSEC_PER_USEC);
851 ts = ktime_to_timespec64(error->uptime);
852 err_printf(m, "Uptime: %lld s %ld us\n",
853 (s64)ts.tv_sec, ts.tv_nsec / NSEC_PER_USEC);
854 err_printf(m, "Capture: %lu jiffies; %d ms ago\n",
855 error->capture, jiffies_to_msecs(jiffies - error->capture));
856
857 for (ee = error->gt ? error->gt->engine : NULL; ee; ee = ee->next)
858 err_printf(m, "Active process (on ring %s): %s [%d]\n",
859 ee->engine->name,
860 ee->context.comm,
861 ee->context.pid);
862
863 err_printf(m, "Reset count: %u\n", error->reset_count);
864 err_printf(m, "Suspend count: %u\n", error->suspend_count);
865 err_printf(m, "Platform: %s\n", intel_platform_name(error->device_info.platform));
866 err_printf(m, "Subplatform: 0x%x\n",
867 intel_subplatform(&error->runtime_info,
868 error->device_info.platform));
869 err_print_pciid(m, m->i915);
870
871 err_printf(m, "IOMMU enabled?: %d\n", error->iommu);
872
873 err_printf(m, "RPM wakelock: %s\n", str_yes_no(error->wakelock));
874 err_printf(m, "PM suspended: %s\n", str_yes_no(error->suspended));
875
876 if (error->gt) {
877 bool print_guc_capture = false;
878
879 if (error->gt->uc && error->gt->uc->guc.is_guc_capture)
880 print_guc_capture = true;
881
882 err_print_gt_display(m, error->gt);
883 err_print_gt_global_nonguc(m, error->gt);
884 err_print_gt_fences(m, error->gt);
885
886 /*
887 * GuC dumped global, eng-class and eng-instance registers together
888 * as part of engine state dump so we print in err_print_gt_engines
889 */
890 if (!print_guc_capture)
891 err_print_gt_global(m, error->gt);
892
893 err_print_gt_engines(m, error->gt);
894
895 if (error->gt->uc)
896 err_print_uc(m, error->gt->uc);
897
898 err_print_gt_info(m, error->gt);
899 }
900
901 err_print_capabilities(m, error);
902 err_print_params(m, &error->params);
903
904 intel_display_snapshot_print(error->display_snapshot, &p);
905}
906
907static int err_print_to_sgl(struct i915_gpu_coredump *error)
908{
909 struct drm_i915_error_state_buf m;
910
911 if (IS_ERR(error))
912 return PTR_ERR(error);
913
914 if (READ_ONCE(error->sgl))
915 return 0;
916
917 memset(&m, 0, sizeof(m));
918 m.i915 = error->i915;
919
920 __err_print_to_sgl(&m, error);
921
922 if (m.buf) {
923 __sg_set_buf(m.cur++, m.buf, m.bytes, m.iter);
924 m.bytes = 0;
925 m.buf = NULL;
926 }
927 if (m.cur) {
928 GEM_BUG_ON(m.end < m.cur);
929 sg_mark_end(m.cur - 1);
930 }
931 GEM_BUG_ON(m.sgl && !m.cur);
932
933 if (m.err) {
934 err_free_sgl(m.sgl);
935 return m.err;
936 }
937
938 if (cmpxchg(&error->sgl, NULL, m.sgl))
939 err_free_sgl(m.sgl);
940
941 return 0;
942}
943
944ssize_t i915_gpu_coredump_copy_to_buffer(struct i915_gpu_coredump *error,
945 char *buf, loff_t off, size_t rem)
946{
947 struct scatterlist *sg;
948 size_t count;
949 loff_t pos;
950 int err;
951
952 if (!error || !rem)
953 return 0;
954
955 err = err_print_to_sgl(error);
956 if (err)
957 return err;
958
959 sg = READ_ONCE(error->fit);
960 if (!sg || off < sg->dma_address)
961 sg = error->sgl;
962 if (!sg)
963 return 0;
964
965 pos = sg->dma_address;
966 count = 0;
967 do {
968 size_t len, start;
969
970 if (sg_is_chain(sg)) {
971 sg = sg_chain_ptr(sg);
972 GEM_BUG_ON(sg_is_chain(sg));
973 }
974
975 len = sg->length;
976 if (pos + len <= off) {
977 pos += len;
978 continue;
979 }
980
981 start = sg->offset;
982 if (pos < off) {
983 GEM_BUG_ON(off - pos > len);
984 len -= off - pos;
985 start += off - pos;
986 pos = off;
987 }
988
989 len = min(len, rem);
990 GEM_BUG_ON(!len || len > sg->length);
991
992 memcpy(buf, page_address(sg_page(sg)) + start, len);
993
994 count += len;
995 pos += len;
996
997 buf += len;
998 rem -= len;
999 if (!rem) {
1000 WRITE_ONCE(error->fit, sg);
1001 break;
1002 }
1003 } while (!sg_is_last(sg++));
1004
1005 return count;
1006}
1007
1008static void i915_vma_coredump_free(struct i915_vma_coredump *vma)
1009{
1010 while (vma) {
1011 struct i915_vma_coredump *next = vma->next;
1012 struct page *page, *n;
1013
1014 list_for_each_entry_safe(page, n, &vma->page_list, lru) {
1015 list_del_init(&page->lru);
1016 __free_page(page);
1017 }
1018
1019 kfree(vma);
1020 vma = next;
1021 }
1022}
1023
1024static void cleanup_params(struct i915_gpu_coredump *error)
1025{
1026 i915_params_free(&error->params);
1027}
1028
1029static void cleanup_uc(struct intel_uc_coredump *uc)
1030{
1031 kfree(uc->guc_fw.file_selected.path);
1032 kfree(uc->huc_fw.file_selected.path);
1033 kfree(uc->guc_fw.file_wanted.path);
1034 kfree(uc->huc_fw.file_wanted.path);
1035 i915_vma_coredump_free(uc->guc.vma_log);
1036 i915_vma_coredump_free(uc->guc.vma_ctb);
1037
1038 kfree(uc);
1039}
1040
1041static void cleanup_gt(struct intel_gt_coredump *gt)
1042{
1043 while (gt->engine) {
1044 struct intel_engine_coredump *ee = gt->engine;
1045
1046 gt->engine = ee->next;
1047
1048 i915_vma_coredump_free(ee->vma);
1049 intel_guc_capture_free_node(ee);
1050 kfree(ee);
1051 }
1052
1053 if (gt->uc)
1054 cleanup_uc(gt->uc);
1055
1056 kfree(gt);
1057}
1058
1059void __i915_gpu_coredump_free(struct kref *error_ref)
1060{
1061 struct i915_gpu_coredump *error =
1062 container_of(error_ref, typeof(*error), ref);
1063
1064 while (error->gt) {
1065 struct intel_gt_coredump *gt = error->gt;
1066
1067 error->gt = gt->next;
1068 cleanup_gt(gt);
1069 }
1070
1071 intel_display_snapshot_free(error->display_snapshot);
1072
1073 cleanup_params(error);
1074
1075 err_free_sgl(error->sgl);
1076 kfree(error);
1077}
1078
1079static struct i915_vma_coredump *
1080i915_vma_coredump_create(const struct intel_gt *gt,
1081 const struct i915_vma_resource *vma_res,
1082 struct i915_vma_compress *compress,
1083 const char *name)
1084
1085{
1086 struct i915_ggtt *ggtt = gt->ggtt;
1087 const u64 slot = ggtt->error_capture.start;
1088 struct i915_vma_coredump *dst;
1089 struct sgt_iter iter;
1090 int ret;
1091
1092 might_sleep();
1093
1094 if (!vma_res || !vma_res->bi.pages || !compress)
1095 return NULL;
1096
1097 dst = kmalloc(sizeof(*dst), ALLOW_FAIL);
1098 if (!dst)
1099 return NULL;
1100
1101 if (!compress_start(compress)) {
1102 kfree(dst);
1103 return NULL;
1104 }
1105
1106 INIT_LIST_HEAD(&dst->page_list);
1107 strscpy(dst->name, name);
1108 dst->next = NULL;
1109
1110 dst->gtt_offset = vma_res->start;
1111 dst->gtt_size = vma_res->node_size;
1112 dst->gtt_page_sizes = vma_res->page_sizes_gtt;
1113 dst->unused = 0;
1114
1115 ret = -EINVAL;
1116 if (drm_mm_node_allocated(&ggtt->error_capture)) {
1117 void __iomem *s;
1118 dma_addr_t dma;
1119
1120 for_each_sgt_daddr(dma, iter, vma_res->bi.pages) {
1121 mutex_lock(&ggtt->error_mutex);
1122 if (ggtt->vm.raw_insert_page)
1123 ggtt->vm.raw_insert_page(&ggtt->vm, dma, slot,
1124 i915_gem_get_pat_index(gt->i915,
1125 I915_CACHE_NONE),
1126 0);
1127 else
1128 ggtt->vm.insert_page(&ggtt->vm, dma, slot,
1129 i915_gem_get_pat_index(gt->i915,
1130 I915_CACHE_NONE),
1131 0);
1132 mb();
1133
1134 s = io_mapping_map_wc(&ggtt->iomap, slot, PAGE_SIZE);
1135 ret = compress_page(compress,
1136 (void __force *)s, dst,
1137 true);
1138 io_mapping_unmap(s);
1139
1140 mb();
1141 ggtt->vm.clear_range(&ggtt->vm, slot, PAGE_SIZE);
1142 mutex_unlock(&ggtt->error_mutex);
1143 if (ret)
1144 break;
1145 }
1146 } else if (vma_res->bi.lmem) {
1147 struct intel_memory_region *mem = vma_res->mr;
1148 dma_addr_t dma;
1149
1150 for_each_sgt_daddr(dma, iter, vma_res->bi.pages) {
1151 dma_addr_t offset = dma - mem->region.start;
1152 void __iomem *s;
1153
1154 if (offset + PAGE_SIZE > resource_size(&mem->io)) {
1155 ret = -EINVAL;
1156 break;
1157 }
1158
1159 s = io_mapping_map_wc(&mem->iomap, offset, PAGE_SIZE);
1160 ret = compress_page(compress,
1161 (void __force *)s, dst,
1162 true);
1163 io_mapping_unmap(s);
1164 if (ret)
1165 break;
1166 }
1167 } else {
1168 struct page *page;
1169
1170 for_each_sgt_page(page, iter, vma_res->bi.pages) {
1171 void *s;
1172
1173 drm_clflush_pages(&page, 1);
1174
1175 s = kmap_local_page(page);
1176 ret = compress_page(compress, s, dst, false);
1177 kunmap_local(s);
1178
1179 drm_clflush_pages(&page, 1);
1180
1181 if (ret)
1182 break;
1183 }
1184 }
1185
1186 if (ret || compress_flush(compress, dst)) {
1187 struct page *page, *n;
1188
1189 list_for_each_entry_safe_reverse(page, n, &dst->page_list, lru) {
1190 list_del_init(&page->lru);
1191 pool_free(&compress->pool, page_address(page));
1192 }
1193
1194 kfree(dst);
1195 dst = NULL;
1196 }
1197 compress_finish(compress);
1198
1199 return dst;
1200}
1201
1202static void gt_record_fences(struct intel_gt_coredump *gt)
1203{
1204 struct i915_ggtt *ggtt = gt->_gt->ggtt;
1205 struct intel_uncore *uncore = gt->_gt->uncore;
1206 int i;
1207
1208 if (GRAPHICS_VER(uncore->i915) >= 6) {
1209 for (i = 0; i < ggtt->num_fences; i++)
1210 gt->fence[i] =
1211 intel_uncore_read64(uncore,
1212 FENCE_REG_GEN6_LO(i));
1213 } else if (GRAPHICS_VER(uncore->i915) >= 4) {
1214 for (i = 0; i < ggtt->num_fences; i++)
1215 gt->fence[i] =
1216 intel_uncore_read64(uncore,
1217 FENCE_REG_965_LO(i));
1218 } else {
1219 for (i = 0; i < ggtt->num_fences; i++)
1220 gt->fence[i] =
1221 intel_uncore_read(uncore, FENCE_REG(i));
1222 }
1223 gt->nfence = i;
1224}
1225
1226static void engine_record_registers(struct intel_engine_coredump *ee)
1227{
1228 const struct intel_engine_cs *engine = ee->engine;
1229 struct drm_i915_private *i915 = engine->i915;
1230
1231 if (GRAPHICS_VER(i915) >= 6) {
1232 ee->rc_psmi = ENGINE_READ(engine, RING_PSMI_CTL);
1233
1234 /*
1235 * For the media GT, this ring fault register is not replicated,
1236 * so don't do multicast/replicated register read/write
1237 * operation on it.
1238 */
1239 if (MEDIA_VER(i915) >= 13 && engine->gt->type == GT_MEDIA)
1240 ee->fault_reg = intel_uncore_read(engine->uncore,
1241 XELPMP_RING_FAULT_REG);
1242 else if (GRAPHICS_VER_FULL(i915) >= IP_VER(12, 55))
1243 ee->fault_reg = intel_gt_mcr_read_any(engine->gt,
1244 XEHP_RING_FAULT_REG);
1245 else if (GRAPHICS_VER(i915) >= 12)
1246 ee->fault_reg = intel_uncore_read(engine->uncore,
1247 GEN12_RING_FAULT_REG);
1248 else if (GRAPHICS_VER(i915) >= 8)
1249 ee->fault_reg = intel_uncore_read(engine->uncore,
1250 GEN8_RING_FAULT_REG);
1251 else
1252 ee->fault_reg = GEN6_RING_FAULT_REG_READ(engine);
1253 }
1254
1255 if (GRAPHICS_VER(i915) >= 4) {
1256 ee->esr = ENGINE_READ(engine, RING_ESR);
1257 ee->faddr = ENGINE_READ(engine, RING_DMA_FADD);
1258 ee->ipeir = ENGINE_READ(engine, RING_IPEIR);
1259 ee->ipehr = ENGINE_READ(engine, RING_IPEHR);
1260 ee->instps = ENGINE_READ(engine, RING_INSTPS);
1261 ee->bbaddr = ENGINE_READ(engine, RING_BBADDR);
1262 ee->ccid = ENGINE_READ(engine, CCID);
1263 if (GRAPHICS_VER(i915) >= 8) {
1264 ee->faddr |= (u64)ENGINE_READ(engine, RING_DMA_FADD_UDW) << 32;
1265 ee->bbaddr |= (u64)ENGINE_READ(engine, RING_BBADDR_UDW) << 32;
1266 }
1267 ee->bbstate = ENGINE_READ(engine, RING_BBSTATE);
1268 } else {
1269 ee->faddr = ENGINE_READ(engine, DMA_FADD_I8XX);
1270 ee->ipeir = ENGINE_READ(engine, IPEIR);
1271 ee->ipehr = ENGINE_READ(engine, IPEHR);
1272 }
1273
1274 if (GRAPHICS_VER(i915) >= 11) {
1275 ee->cmd_cctl = ENGINE_READ(engine, RING_CMD_CCTL);
1276 ee->cscmdop = ENGINE_READ(engine, RING_CSCMDOP);
1277 ee->ctx_sr_ctl = ENGINE_READ(engine, RING_CTX_SR_CTL);
1278 ee->dma_faddr_hi = ENGINE_READ(engine, RING_DMA_FADD_UDW);
1279 ee->dma_faddr_lo = ENGINE_READ(engine, RING_DMA_FADD);
1280 ee->nopid = ENGINE_READ(engine, RING_NOPID);
1281 ee->excc = ENGINE_READ(engine, RING_EXCC);
1282 }
1283
1284 intel_engine_get_instdone(engine, &ee->instdone);
1285
1286 ee->instpm = ENGINE_READ(engine, RING_INSTPM);
1287 ee->acthd = intel_engine_get_active_head(engine);
1288 ee->start = ENGINE_READ(engine, RING_START);
1289 ee->head = ENGINE_READ(engine, RING_HEAD);
1290 ee->tail = ENGINE_READ(engine, RING_TAIL);
1291 ee->ctl = ENGINE_READ(engine, RING_CTL);
1292 if (GRAPHICS_VER(i915) > 2)
1293 ee->mode = ENGINE_READ(engine, RING_MI_MODE);
1294
1295 if (!HWS_NEEDS_PHYSICAL(i915)) {
1296 i915_reg_t mmio;
1297
1298 if (GRAPHICS_VER(i915) == 7) {
1299 switch (engine->id) {
1300 default:
1301 MISSING_CASE(engine->id);
1302 fallthrough;
1303 case RCS0:
1304 mmio = RENDER_HWS_PGA_GEN7;
1305 break;
1306 case BCS0:
1307 mmio = BLT_HWS_PGA_GEN7;
1308 break;
1309 case VCS0:
1310 mmio = BSD_HWS_PGA_GEN7;
1311 break;
1312 case VECS0:
1313 mmio = VEBOX_HWS_PGA_GEN7;
1314 break;
1315 }
1316 } else if (GRAPHICS_VER(engine->i915) == 6) {
1317 mmio = RING_HWS_PGA_GEN6(engine->mmio_base);
1318 } else {
1319 /* XXX: gen8 returns to sanity */
1320 mmio = RING_HWS_PGA(engine->mmio_base);
1321 }
1322
1323 ee->hws = intel_uncore_read(engine->uncore, mmio);
1324 }
1325
1326 ee->reset_count = i915_reset_engine_count(&i915->gpu_error, engine);
1327
1328 if (HAS_PPGTT(i915)) {
1329 int i;
1330
1331 ee->vm_info.gfx_mode = ENGINE_READ(engine, RING_MODE_GEN7);
1332
1333 if (GRAPHICS_VER(i915) == 6) {
1334 ee->vm_info.pp_dir_base =
1335 ENGINE_READ(engine, RING_PP_DIR_BASE_READ);
1336 } else if (GRAPHICS_VER(i915) == 7) {
1337 ee->vm_info.pp_dir_base =
1338 ENGINE_READ(engine, RING_PP_DIR_BASE);
1339 } else if (GRAPHICS_VER(i915) >= 8) {
1340 u32 base = engine->mmio_base;
1341
1342 for (i = 0; i < 4; i++) {
1343 ee->vm_info.pdp[i] =
1344 intel_uncore_read(engine->uncore,
1345 GEN8_RING_PDP_UDW(base, i));
1346 ee->vm_info.pdp[i] <<= 32;
1347 ee->vm_info.pdp[i] |=
1348 intel_uncore_read(engine->uncore,
1349 GEN8_RING_PDP_LDW(base, i));
1350 }
1351 }
1352 }
1353}
1354
1355static void record_request(const struct i915_request *request,
1356 struct i915_request_coredump *erq)
1357{
1358 erq->flags = request->fence.flags;
1359 erq->context = request->fence.context;
1360 erq->seqno = request->fence.seqno;
1361 erq->sched_attr = request->sched.attr;
1362 erq->head = request->head;
1363 erq->tail = request->tail;
1364
1365 erq->pid = 0;
1366 rcu_read_lock();
1367 if (!intel_context_is_closed(request->context)) {
1368 const struct i915_gem_context *ctx;
1369
1370 ctx = rcu_dereference(request->context->gem_context);
1371 if (ctx)
1372 erq->pid = pid_nr(ctx->pid);
1373 }
1374 rcu_read_unlock();
1375}
1376
1377static void engine_record_execlists(struct intel_engine_coredump *ee)
1378{
1379 const struct intel_engine_execlists * const el = &ee->engine->execlists;
1380 struct i915_request * const *port = el->active;
1381 unsigned int n = 0;
1382
1383 while (*port)
1384 record_request(*port++, &ee->execlist[n++]);
1385
1386 ee->num_ports = n;
1387}
1388
1389static bool record_context(struct i915_gem_context_coredump *e,
1390 struct intel_context *ce)
1391{
1392 struct i915_gem_context *ctx;
1393 struct task_struct *task;
1394 bool simulated;
1395
1396 rcu_read_lock();
1397 ctx = rcu_dereference(ce->gem_context);
1398 if (ctx && !kref_get_unless_zero(&ctx->ref))
1399 ctx = NULL;
1400 rcu_read_unlock();
1401 if (!ctx)
1402 return true;
1403
1404 rcu_read_lock();
1405 task = pid_task(ctx->pid, PIDTYPE_PID);
1406 if (task) {
1407 strscpy(e->comm, task->comm);
1408 e->pid = task->pid;
1409 }
1410 rcu_read_unlock();
1411
1412 e->sched_attr = ctx->sched;
1413 e->guilty = atomic_read(&ctx->guilty_count);
1414 e->active = atomic_read(&ctx->active_count);
1415 e->hwsp_seqno = (ce->timeline && ce->timeline->hwsp_seqno) ?
1416 *ce->timeline->hwsp_seqno : ~0U;
1417
1418 e->total_runtime = intel_context_get_total_runtime_ns(ce);
1419 e->avg_runtime = intel_context_get_avg_runtime_ns(ce);
1420
1421 simulated = i915_gem_context_no_error_capture(ctx);
1422
1423 i915_gem_context_put(ctx);
1424 return simulated;
1425}
1426
1427struct intel_engine_capture_vma {
1428 struct intel_engine_capture_vma *next;
1429 struct i915_vma_resource *vma_res;
1430 char name[16];
1431 bool lockdep_cookie;
1432};
1433
1434static struct intel_engine_capture_vma *
1435capture_vma_snapshot(struct intel_engine_capture_vma *next,
1436 struct i915_vma_resource *vma_res,
1437 gfp_t gfp, const char *name)
1438{
1439 struct intel_engine_capture_vma *c;
1440
1441 if (!vma_res)
1442 return next;
1443
1444 c = kmalloc(sizeof(*c), gfp);
1445 if (!c)
1446 return next;
1447
1448 if (!i915_vma_resource_hold(vma_res, &c->lockdep_cookie)) {
1449 kfree(c);
1450 return next;
1451 }
1452
1453 strscpy(c->name, name);
1454 c->vma_res = i915_vma_resource_get(vma_res);
1455
1456 c->next = next;
1457 return c;
1458}
1459
1460static struct intel_engine_capture_vma *
1461capture_vma(struct intel_engine_capture_vma *next,
1462 struct i915_vma *vma,
1463 const char *name,
1464 gfp_t gfp)
1465{
1466 if (!vma)
1467 return next;
1468
1469 /*
1470 * If the vma isn't pinned, then the vma should be snapshotted
1471 * to a struct i915_vma_snapshot at command submission time.
1472 * Not here.
1473 */
1474 if (GEM_WARN_ON(!i915_vma_is_pinned(vma)))
1475 return next;
1476
1477 next = capture_vma_snapshot(next, vma->resource, gfp, name);
1478
1479 return next;
1480}
1481
1482static struct intel_engine_capture_vma *
1483capture_user(struct intel_engine_capture_vma *capture,
1484 const struct i915_request *rq,
1485 gfp_t gfp)
1486{
1487 struct i915_capture_list *c;
1488
1489 for (c = rq->capture_list; c; c = c->next)
1490 capture = capture_vma_snapshot(capture, c->vma_res, gfp,
1491 "user");
1492
1493 return capture;
1494}
1495
1496static void add_vma(struct intel_engine_coredump *ee,
1497 struct i915_vma_coredump *vma)
1498{
1499 if (vma) {
1500 vma->next = ee->vma;
1501 ee->vma = vma;
1502 }
1503}
1504
1505static struct i915_vma_coredump *
1506create_vma_coredump(const struct intel_gt *gt, struct i915_vma *vma,
1507 const char *name, struct i915_vma_compress *compress)
1508{
1509 struct i915_vma_coredump *ret = NULL;
1510 struct i915_vma_resource *vma_res;
1511 bool lockdep_cookie;
1512
1513 if (!vma)
1514 return NULL;
1515
1516 vma_res = vma->resource;
1517
1518 if (i915_vma_resource_hold(vma_res, &lockdep_cookie)) {
1519 ret = i915_vma_coredump_create(gt, vma_res, compress, name);
1520 i915_vma_resource_unhold(vma_res, lockdep_cookie);
1521 }
1522
1523 return ret;
1524}
1525
1526static void add_vma_coredump(struct intel_engine_coredump *ee,
1527 const struct intel_gt *gt,
1528 struct i915_vma *vma,
1529 const char *name,
1530 struct i915_vma_compress *compress)
1531{
1532 add_vma(ee, create_vma_coredump(gt, vma, name, compress));
1533}
1534
1535struct intel_engine_coredump *
1536intel_engine_coredump_alloc(struct intel_engine_cs *engine, gfp_t gfp, u32 dump_flags)
1537{
1538 struct intel_engine_coredump *ee;
1539
1540 ee = kzalloc(sizeof(*ee), gfp);
1541 if (!ee)
1542 return NULL;
1543
1544 ee->engine = engine;
1545
1546 if (!(dump_flags & CORE_DUMP_FLAG_IS_GUC_CAPTURE)) {
1547 engine_record_registers(ee);
1548 engine_record_execlists(ee);
1549 }
1550
1551 return ee;
1552}
1553
1554static struct intel_engine_capture_vma *
1555engine_coredump_add_context(struct intel_engine_coredump *ee,
1556 struct intel_context *ce,
1557 gfp_t gfp)
1558{
1559 struct intel_engine_capture_vma *vma = NULL;
1560
1561 ee->simulated |= record_context(&ee->context, ce);
1562 if (ee->simulated)
1563 return NULL;
1564
1565 /*
1566 * We need to copy these to an anonymous buffer
1567 * as the simplest method to avoid being overwritten
1568 * by userspace.
1569 */
1570 vma = capture_vma(vma, ce->ring->vma, "ring", gfp);
1571 vma = capture_vma(vma, ce->state, "HW context", gfp);
1572
1573 return vma;
1574}
1575
1576struct intel_engine_capture_vma *
1577intel_engine_coredump_add_request(struct intel_engine_coredump *ee,
1578 struct i915_request *rq,
1579 gfp_t gfp)
1580{
1581 struct intel_engine_capture_vma *vma;
1582
1583 vma = engine_coredump_add_context(ee, rq->context, gfp);
1584 if (!vma)
1585 return NULL;
1586
1587 /*
1588 * We need to copy these to an anonymous buffer
1589 * as the simplest method to avoid being overwritten
1590 * by userspace.
1591 */
1592 vma = capture_vma_snapshot(vma, rq->batch_res, gfp, "batch");
1593 vma = capture_user(vma, rq, gfp);
1594
1595 ee->rq_head = rq->head;
1596 ee->rq_post = rq->postfix;
1597 ee->rq_tail = rq->tail;
1598
1599 return vma;
1600}
1601
1602void
1603intel_engine_coredump_add_vma(struct intel_engine_coredump *ee,
1604 struct intel_engine_capture_vma *capture,
1605 struct i915_vma_compress *compress)
1606{
1607 const struct intel_engine_cs *engine = ee->engine;
1608
1609 while (capture) {
1610 struct intel_engine_capture_vma *this = capture;
1611 struct i915_vma_resource *vma_res = this->vma_res;
1612
1613 add_vma(ee,
1614 i915_vma_coredump_create(engine->gt, vma_res,
1615 compress, this->name));
1616
1617 i915_vma_resource_unhold(vma_res, this->lockdep_cookie);
1618 i915_vma_resource_put(vma_res);
1619
1620 capture = this->next;
1621 kfree(this);
1622 }
1623
1624 add_vma_coredump(ee, engine->gt, engine->status_page.vma,
1625 "HW Status", compress);
1626
1627 add_vma_coredump(ee, engine->gt, engine->wa_ctx.vma,
1628 "WA context", compress);
1629}
1630
1631static struct intel_engine_coredump *
1632capture_engine(struct intel_engine_cs *engine,
1633 struct i915_vma_compress *compress,
1634 u32 dump_flags)
1635{
1636 struct intel_engine_capture_vma *capture = NULL;
1637 struct intel_engine_coredump *ee;
1638 struct intel_context *ce = NULL;
1639 struct i915_request *rq = NULL;
1640
1641 ee = intel_engine_coredump_alloc(engine, ALLOW_FAIL, dump_flags);
1642 if (!ee)
1643 return NULL;
1644
1645 intel_engine_get_hung_entity(engine, &ce, &rq);
1646 if (rq && !i915_request_started(rq)) {
1647 /*
1648 * We want to know also what is the guc_id of the context,
1649 * but if we don't have the context reference, then skip
1650 * printing it.
1651 */
1652 if (ce)
1653 drm_info(&engine->gt->i915->drm,
1654 "Got hung context on %s with active request %lld:%lld [0x%04X] not yet started\n",
1655 engine->name, rq->fence.context, rq->fence.seqno, ce->guc_id.id);
1656 else
1657 drm_info(&engine->gt->i915->drm,
1658 "Got hung context on %s with active request %lld:%lld not yet started\n",
1659 engine->name, rq->fence.context, rq->fence.seqno);
1660 }
1661
1662 if (rq) {
1663 capture = intel_engine_coredump_add_request(ee, rq, ATOMIC_MAYFAIL);
1664 i915_request_put(rq);
1665 } else if (ce) {
1666 capture = engine_coredump_add_context(ee, ce, ATOMIC_MAYFAIL);
1667 }
1668
1669 if (capture) {
1670 intel_engine_coredump_add_vma(ee, capture, compress);
1671
1672 if (dump_flags & CORE_DUMP_FLAG_IS_GUC_CAPTURE)
1673 intel_guc_capture_get_matching_node(engine->gt, ee, ce);
1674 } else {
1675 kfree(ee);
1676 ee = NULL;
1677 }
1678
1679 return ee;
1680}
1681
1682static void
1683gt_record_engines(struct intel_gt_coredump *gt,
1684 intel_engine_mask_t engine_mask,
1685 struct i915_vma_compress *compress,
1686 u32 dump_flags)
1687{
1688 struct intel_engine_cs *engine;
1689 enum intel_engine_id id;
1690
1691 for_each_engine(engine, gt->_gt, id) {
1692 struct intel_engine_coredump *ee;
1693
1694 /* Refill our page pool before entering atomic section */
1695 pool_refill(&compress->pool, ALLOW_FAIL);
1696
1697 ee = capture_engine(engine, compress, dump_flags);
1698 if (!ee)
1699 continue;
1700
1701 ee->hung = engine->mask & engine_mask;
1702
1703 gt->simulated |= ee->simulated;
1704 if (ee->simulated) {
1705 if (dump_flags & CORE_DUMP_FLAG_IS_GUC_CAPTURE)
1706 intel_guc_capture_free_node(ee);
1707 kfree(ee);
1708 continue;
1709 }
1710
1711 ee->next = gt->engine;
1712 gt->engine = ee;
1713 }
1714}
1715
1716static void gt_record_guc_ctb(struct intel_ctb_coredump *saved,
1717 const struct intel_guc_ct_buffer *ctb,
1718 const void *blob_ptr, struct intel_guc *guc)
1719{
1720 if (!ctb || !ctb->desc)
1721 return;
1722
1723 saved->raw_status = ctb->desc->status;
1724 saved->raw_head = ctb->desc->head;
1725 saved->raw_tail = ctb->desc->tail;
1726 saved->head = ctb->head;
1727 saved->tail = ctb->tail;
1728 saved->size = ctb->size;
1729 saved->desc_offset = ((void *)ctb->desc) - blob_ptr;
1730 saved->cmds_offset = ((void *)ctb->cmds) - blob_ptr;
1731}
1732
1733static struct intel_uc_coredump *
1734gt_record_uc(struct intel_gt_coredump *gt,
1735 struct i915_vma_compress *compress)
1736{
1737 const struct intel_uc *uc = >->_gt->uc;
1738 struct intel_uc_coredump *error_uc;
1739
1740 error_uc = kzalloc(sizeof(*error_uc), ALLOW_FAIL);
1741 if (!error_uc)
1742 return NULL;
1743
1744 memcpy(&error_uc->guc_fw, &uc->guc.fw, sizeof(uc->guc.fw));
1745 memcpy(&error_uc->huc_fw, &uc->huc.fw, sizeof(uc->huc.fw));
1746
1747 error_uc->guc_fw.file_selected.path = kstrdup(uc->guc.fw.file_selected.path, ALLOW_FAIL);
1748 error_uc->huc_fw.file_selected.path = kstrdup(uc->huc.fw.file_selected.path, ALLOW_FAIL);
1749 error_uc->guc_fw.file_wanted.path = kstrdup(uc->guc.fw.file_wanted.path, ALLOW_FAIL);
1750 error_uc->huc_fw.file_wanted.path = kstrdup(uc->huc.fw.file_wanted.path, ALLOW_FAIL);
1751
1752 /*
1753 * Save the GuC log and include a timestamp reference for converting the
1754 * log times to system times (in conjunction with the error->boottime and
1755 * gt->clock_frequency fields saved elsewhere).
1756 */
1757 error_uc->guc.timestamp = intel_uncore_read(gt->_gt->uncore, GUCPMTIMESTAMP);
1758 error_uc->guc.vma_log = create_vma_coredump(gt->_gt, uc->guc.log.vma,
1759 "GuC log buffer", compress);
1760 error_uc->guc.vma_ctb = create_vma_coredump(gt->_gt, uc->guc.ct.vma,
1761 "GuC CT buffer", compress);
1762 error_uc->guc.last_fence = uc->guc.ct.requests.last_fence;
1763 gt_record_guc_ctb(error_uc->guc.ctb + 0, &uc->guc.ct.ctbs.send,
1764 uc->guc.ct.ctbs.send.desc, (struct intel_guc *)&uc->guc);
1765 gt_record_guc_ctb(error_uc->guc.ctb + 1, &uc->guc.ct.ctbs.recv,
1766 uc->guc.ct.ctbs.send.desc, (struct intel_guc *)&uc->guc);
1767
1768 return error_uc;
1769}
1770
1771/* Capture display registers. */
1772static void gt_record_display_regs(struct intel_gt_coredump *gt)
1773{
1774 struct intel_uncore *uncore = gt->_gt->uncore;
1775 struct drm_i915_private *i915 = uncore->i915;
1776
1777 if (DISPLAY_VER(i915) >= 6 && DISPLAY_VER(i915) < 20)
1778 gt->derrmr = intel_uncore_read(uncore, DERRMR);
1779
1780 if (GRAPHICS_VER(i915) >= 8)
1781 gt->ier = intel_uncore_read(uncore, GEN8_DE_MISC_IER);
1782 else if (IS_VALLEYVIEW(i915))
1783 gt->ier = intel_uncore_read(uncore, VLV_IER);
1784 else if (HAS_PCH_SPLIT(i915))
1785 gt->ier = intel_uncore_read(uncore, DEIER);
1786 else if (GRAPHICS_VER(i915) == 2)
1787 gt->ier = intel_uncore_read16(uncore, GEN2_IER);
1788 else
1789 gt->ier = intel_uncore_read(uncore, GEN2_IER);
1790}
1791
1792/* Capture all other registers that GuC doesn't capture. */
1793static void gt_record_global_nonguc_regs(struct intel_gt_coredump *gt)
1794{
1795 struct intel_uncore *uncore = gt->_gt->uncore;
1796 struct drm_i915_private *i915 = uncore->i915;
1797 int i;
1798
1799 if (IS_VALLEYVIEW(i915)) {
1800 gt->gtier[0] = intel_uncore_read(uncore, GTIER);
1801 gt->ngtier = 1;
1802 } else if (GRAPHICS_VER(i915) >= 11) {
1803 gt->gtier[0] =
1804 intel_uncore_read(uncore,
1805 GEN11_RENDER_COPY_INTR_ENABLE);
1806 gt->gtier[1] =
1807 intel_uncore_read(uncore, GEN11_VCS_VECS_INTR_ENABLE);
1808 gt->gtier[2] =
1809 intel_uncore_read(uncore, GEN11_GUC_SG_INTR_ENABLE);
1810 gt->gtier[3] =
1811 intel_uncore_read(uncore,
1812 GEN11_GPM_WGBOXPERF_INTR_ENABLE);
1813 gt->gtier[4] =
1814 intel_uncore_read(uncore,
1815 GEN11_CRYPTO_RSVD_INTR_ENABLE);
1816 gt->gtier[5] =
1817 intel_uncore_read(uncore,
1818 GEN11_GUNIT_CSME_INTR_ENABLE);
1819 gt->ngtier = 6;
1820 } else if (GRAPHICS_VER(i915) >= 8) {
1821 for (i = 0; i < 4; i++)
1822 gt->gtier[i] =
1823 intel_uncore_read(uncore, GEN8_GT_IER(i));
1824 gt->ngtier = 4;
1825 } else if (HAS_PCH_SPLIT(i915)) {
1826 gt->gtier[0] = intel_uncore_read(uncore, GTIER);
1827 gt->ngtier = 1;
1828 }
1829
1830 gt->eir = intel_uncore_read(uncore, EIR);
1831 gt->pgtbl_er = intel_uncore_read(uncore, PGTBL_ER);
1832}
1833
1834/*
1835 * Capture all registers that relate to workload submission.
1836 * NOTE: In GuC submission, when GuC resets an engine, it can dump these for us
1837 */
1838static void gt_record_global_regs(struct intel_gt_coredump *gt)
1839{
1840 struct intel_uncore *uncore = gt->_gt->uncore;
1841 struct drm_i915_private *i915 = uncore->i915;
1842 int i;
1843
1844 /*
1845 * General organization
1846 * 1. Registers specific to a single generation
1847 * 2. Registers which belong to multiple generations
1848 * 3. Feature specific registers.
1849 * 4. Everything else
1850 * Please try to follow the order.
1851 */
1852
1853 /* 1: Registers specific to a single generation */
1854 if (IS_VALLEYVIEW(i915))
1855 gt->forcewake = intel_uncore_read_fw(uncore, FORCEWAKE_VLV);
1856
1857 if (GRAPHICS_VER(i915) == 7)
1858 gt->err_int = intel_uncore_read(uncore, GEN7_ERR_INT);
1859
1860 if (GRAPHICS_VER_FULL(i915) >= IP_VER(12, 55)) {
1861 gt->fault_data0 = intel_gt_mcr_read_any((struct intel_gt *)gt->_gt,
1862 XEHP_FAULT_TLB_DATA0);
1863 gt->fault_data1 = intel_gt_mcr_read_any((struct intel_gt *)gt->_gt,
1864 XEHP_FAULT_TLB_DATA1);
1865 } else if (GRAPHICS_VER(i915) >= 12) {
1866 gt->fault_data0 = intel_uncore_read(uncore,
1867 GEN12_FAULT_TLB_DATA0);
1868 gt->fault_data1 = intel_uncore_read(uncore,
1869 GEN12_FAULT_TLB_DATA1);
1870 } else if (GRAPHICS_VER(i915) >= 8) {
1871 gt->fault_data0 = intel_uncore_read(uncore,
1872 GEN8_FAULT_TLB_DATA0);
1873 gt->fault_data1 = intel_uncore_read(uncore,
1874 GEN8_FAULT_TLB_DATA1);
1875 }
1876
1877 if (GRAPHICS_VER(i915) == 6) {
1878 gt->forcewake = intel_uncore_read_fw(uncore, FORCEWAKE);
1879 gt->gab_ctl = intel_uncore_read(uncore, GAB_CTL);
1880 gt->gfx_mode = intel_uncore_read(uncore, GFX_MODE);
1881 }
1882
1883 /* 2: Registers which belong to multiple generations */
1884 if (GRAPHICS_VER(i915) >= 7)
1885 gt->forcewake = intel_uncore_read_fw(uncore, FORCEWAKE_MT);
1886
1887 if (GRAPHICS_VER(i915) >= 6) {
1888 if (GRAPHICS_VER(i915) < 12) {
1889 gt->error = intel_uncore_read(uncore, ERROR_GEN6);
1890 gt->done_reg = intel_uncore_read(uncore, DONE_REG);
1891 }
1892 }
1893
1894 /* 3: Feature specific registers */
1895 if (IS_GRAPHICS_VER(i915, 6, 7)) {
1896 gt->gam_ecochk = intel_uncore_read(uncore, GAM_ECOCHK);
1897 gt->gac_eco = intel_uncore_read(uncore, GAC_ECO_BITS);
1898 }
1899
1900 if (IS_GRAPHICS_VER(i915, 8, 11))
1901 gt->gtt_cache = intel_uncore_read(uncore, HSW_GTT_CACHE_EN);
1902
1903 if (GRAPHICS_VER(i915) == 12)
1904 gt->aux_err = intel_uncore_read(uncore, GEN12_AUX_ERR_DBG);
1905
1906 if (GRAPHICS_VER(i915) >= 12) {
1907 for (i = 0; i < I915_MAX_SFC; i++) {
1908 /*
1909 * SFC_DONE resides in the VD forcewake domain, so it
1910 * only exists if the corresponding VCS engine is
1911 * present.
1912 */
1913 if ((gt->_gt->info.sfc_mask & BIT(i)) == 0 ||
1914 !HAS_ENGINE(gt->_gt, _VCS(i * 2)))
1915 continue;
1916
1917 gt->sfc_done[i] =
1918 intel_uncore_read(uncore, GEN12_SFC_DONE(i));
1919 }
1920
1921 gt->gam_done = intel_uncore_read(uncore, GEN12_GAM_DONE);
1922 }
1923}
1924
1925static void gt_record_info(struct intel_gt_coredump *gt)
1926{
1927 memcpy(>->info, >->_gt->info, sizeof(struct intel_gt_info));
1928 gt->clock_frequency = gt->_gt->clock_frequency;
1929 gt->clock_period_ns = gt->_gt->clock_period_ns;
1930}
1931
1932/*
1933 * Generate a semi-unique error code. The code is not meant to have meaning, The
1934 * code's only purpose is to try to prevent false duplicated bug reports by
1935 * grossly estimating a GPU error state.
1936 *
1937 * TODO Ideally, hashing the batchbuffer would be a very nice way to determine
1938 * the hang if we could strip the GTT offset information from it.
1939 *
1940 * It's only a small step better than a random number in its current form.
1941 */
1942static u32 generate_ecode(const struct intel_engine_coredump *ee)
1943{
1944 /*
1945 * IPEHR would be an ideal way to detect errors, as it's the gross
1946 * measure of "the command that hung." However, has some very common
1947 * synchronization commands which almost always appear in the case
1948 * strictly a client bug. Use instdone to differentiate those some.
1949 */
1950 return ee ? ee->ipehr ^ ee->instdone.instdone : 0;
1951}
1952
1953static const char *error_msg(struct i915_gpu_coredump *error)
1954{
1955 struct intel_engine_coredump *first = NULL;
1956 unsigned int hung_classes = 0;
1957 struct intel_gt_coredump *gt;
1958 int len;
1959
1960 for (gt = error->gt; gt; gt = gt->next) {
1961 struct intel_engine_coredump *cs;
1962
1963 for (cs = gt->engine; cs; cs = cs->next) {
1964 if (cs->hung) {
1965 hung_classes |= BIT(cs->engine->uabi_class);
1966 if (!first)
1967 first = cs;
1968 }
1969 }
1970 }
1971
1972 len = scnprintf(error->error_msg, sizeof(error->error_msg),
1973 "GPU HANG: ecode %d:%x:%08x",
1974 GRAPHICS_VER(error->i915), hung_classes,
1975 generate_ecode(first));
1976 if (first && first->context.pid) {
1977 /* Just show the first executing process, more is confusing */
1978 len += scnprintf(error->error_msg + len,
1979 sizeof(error->error_msg) - len,
1980 ", in %s [%d]",
1981 first->context.comm, first->context.pid);
1982 }
1983
1984 return error->error_msg;
1985}
1986
1987static void capture_gen(struct i915_gpu_coredump *error)
1988{
1989 struct drm_i915_private *i915 = error->i915;
1990
1991 error->wakelock = atomic_read(&i915->runtime_pm.wakeref_count);
1992 error->suspended = pm_runtime_suspended(i915->drm.dev);
1993
1994 error->iommu = i915_vtd_active(i915);
1995 error->reset_count = i915_reset_count(&i915->gpu_error);
1996 error->suspend_count = i915->suspend_count;
1997
1998 i915_params_copy(&error->params, &i915->params);
1999 memcpy(&error->device_info,
2000 INTEL_INFO(i915),
2001 sizeof(error->device_info));
2002 memcpy(&error->runtime_info,
2003 RUNTIME_INFO(i915),
2004 sizeof(error->runtime_info));
2005 error->driver_caps = i915->caps;
2006}
2007
2008struct i915_gpu_coredump *
2009i915_gpu_coredump_alloc(struct drm_i915_private *i915, gfp_t gfp)
2010{
2011 struct i915_gpu_coredump *error;
2012
2013 if (!i915->params.error_capture)
2014 return NULL;
2015
2016 error = kzalloc(sizeof(*error), gfp);
2017 if (!error)
2018 return NULL;
2019
2020 kref_init(&error->ref);
2021 error->i915 = i915;
2022
2023 error->time = ktime_get_real();
2024 error->boottime = ktime_get_boottime();
2025 error->uptime = ktime_sub(ktime_get(), to_gt(i915)->last_init_time);
2026 error->capture = jiffies;
2027
2028 capture_gen(error);
2029
2030 return error;
2031}
2032
2033#define DAY_AS_SECONDS(x) (24 * 60 * 60 * (x))
2034
2035struct intel_gt_coredump *
2036intel_gt_coredump_alloc(struct intel_gt *gt, gfp_t gfp, u32 dump_flags)
2037{
2038 struct intel_gt_coredump *gc;
2039
2040 gc = kzalloc(sizeof(*gc), gfp);
2041 if (!gc)
2042 return NULL;
2043
2044 gc->_gt = gt;
2045 gc->awake = intel_gt_pm_is_awake(gt);
2046
2047 gt_record_display_regs(gc);
2048 gt_record_global_nonguc_regs(gc);
2049
2050 /*
2051 * GuC dumps global, eng-class and eng-instance registers
2052 * (that can change as part of engine state during execution)
2053 * before an engine is reset due to a hung context.
2054 * GuC captures and reports all three groups of registers
2055 * together as a single set before the engine is reset.
2056 * Thus, if GuC triggered the context reset we retrieve
2057 * the register values as part of gt_record_engines.
2058 */
2059 if (!(dump_flags & CORE_DUMP_FLAG_IS_GUC_CAPTURE))
2060 gt_record_global_regs(gc);
2061
2062 gt_record_fences(gc);
2063
2064 return gc;
2065}
2066
2067struct i915_vma_compress *
2068i915_vma_capture_prepare(struct intel_gt_coredump *gt)
2069{
2070 struct i915_vma_compress *compress;
2071
2072 compress = kmalloc(sizeof(*compress), ALLOW_FAIL);
2073 if (!compress)
2074 return NULL;
2075
2076 if (!compress_init(compress)) {
2077 kfree(compress);
2078 return NULL;
2079 }
2080
2081 return compress;
2082}
2083
2084void i915_vma_capture_finish(struct intel_gt_coredump *gt,
2085 struct i915_vma_compress *compress)
2086{
2087 if (!compress)
2088 return;
2089
2090 compress_fini(compress);
2091 kfree(compress);
2092}
2093
2094static struct i915_gpu_coredump *
2095__i915_gpu_coredump(struct intel_gt *gt, intel_engine_mask_t engine_mask, u32 dump_flags)
2096{
2097 struct drm_i915_private *i915 = gt->i915;
2098 struct intel_display *display = &i915->display;
2099 struct i915_gpu_coredump *error;
2100
2101 /* Check if GPU capture has been disabled */
2102 error = READ_ONCE(i915->gpu_error.first_error);
2103 if (IS_ERR(error))
2104 return error;
2105
2106 error = i915_gpu_coredump_alloc(i915, ALLOW_FAIL);
2107 if (!error)
2108 return ERR_PTR(-ENOMEM);
2109
2110 error->gt = intel_gt_coredump_alloc(gt, ALLOW_FAIL, dump_flags);
2111 if (error->gt) {
2112 struct i915_vma_compress *compress;
2113
2114 compress = i915_vma_capture_prepare(error->gt);
2115 if (!compress) {
2116 kfree(error->gt);
2117 kfree(error);
2118 return ERR_PTR(-ENOMEM);
2119 }
2120
2121 if (INTEL_INFO(i915)->has_gt_uc) {
2122 error->gt->uc = gt_record_uc(error->gt, compress);
2123 if (error->gt->uc) {
2124 if (dump_flags & CORE_DUMP_FLAG_IS_GUC_CAPTURE)
2125 error->gt->uc->guc.is_guc_capture = true;
2126 else
2127 GEM_BUG_ON(error->gt->uc->guc.is_guc_capture);
2128 }
2129 }
2130
2131 gt_record_info(error->gt);
2132 gt_record_engines(error->gt, engine_mask, compress, dump_flags);
2133
2134
2135 i915_vma_capture_finish(error->gt, compress);
2136
2137 error->simulated |= error->gt->simulated;
2138 }
2139
2140 error->display_snapshot = intel_display_snapshot_capture(display);
2141
2142 return error;
2143}
2144
2145static struct i915_gpu_coredump *
2146i915_gpu_coredump(struct intel_gt *gt, intel_engine_mask_t engine_mask, u32 dump_flags)
2147{
2148 static DEFINE_MUTEX(capture_mutex);
2149 int ret = mutex_lock_interruptible(&capture_mutex);
2150 struct i915_gpu_coredump *dump;
2151
2152 if (ret)
2153 return ERR_PTR(ret);
2154
2155 dump = __i915_gpu_coredump(gt, engine_mask, dump_flags);
2156 mutex_unlock(&capture_mutex);
2157
2158 return dump;
2159}
2160
2161void i915_error_state_store(struct i915_gpu_coredump *error)
2162{
2163 struct drm_i915_private *i915;
2164 static bool warned;
2165
2166 if (IS_ERR_OR_NULL(error))
2167 return;
2168
2169 i915 = error->i915;
2170 drm_info(&i915->drm, "%s\n", error_msg(error));
2171
2172 if (error->simulated ||
2173 cmpxchg(&i915->gpu_error.first_error, NULL, error))
2174 return;
2175
2176 i915_gpu_coredump_get(error);
2177
2178 if (!xchg(&warned, true) &&
2179 ktime_get_real_seconds() - DRIVER_TIMESTAMP < DAY_AS_SECONDS(180)) {
2180 pr_info("GPU hangs can indicate a bug anywhere in the entire gfx stack, including userspace.\n");
2181 pr_info("Please file a _new_ bug report at https://gitlab.freedesktop.org/drm/intel/issues/new.\n");
2182 pr_info("Please see https://drm.pages.freedesktop.org/intel-docs/how-to-file-i915-bugs.html for details.\n");
2183 pr_info("drm/i915 developers can then reassign to the right component if it's not a kernel issue.\n");
2184 pr_info("The GPU crash dump is required to analyze GPU hangs, so please always attach it.\n");
2185 pr_info("GPU crash dump saved to /sys/class/drm/card%d/error\n",
2186 i915->drm.primary->index);
2187 }
2188}
2189
2190/**
2191 * i915_capture_error_state - capture an error record for later analysis
2192 * @gt: intel_gt which originated the hang
2193 * @engine_mask: hung engines
2194 * @dump_flags: dump flags
2195 *
2196 * Should be called when an error is detected (either a hang or an error
2197 * interrupt) to capture error state from the time of the error. Fills
2198 * out a structure which becomes available in debugfs for user level tools
2199 * to pick up.
2200 */
2201void i915_capture_error_state(struct intel_gt *gt,
2202 intel_engine_mask_t engine_mask, u32 dump_flags)
2203{
2204 struct i915_gpu_coredump *error;
2205
2206 error = i915_gpu_coredump(gt, engine_mask, dump_flags);
2207 if (IS_ERR(error)) {
2208 cmpxchg(>->i915->gpu_error.first_error, NULL, error);
2209 return;
2210 }
2211
2212 i915_error_state_store(error);
2213 i915_gpu_coredump_put(error);
2214}
2215
2216static struct i915_gpu_coredump *
2217i915_first_error_state(struct drm_i915_private *i915)
2218{
2219 struct i915_gpu_coredump *error;
2220
2221 spin_lock_irq(&i915->gpu_error.lock);
2222 error = i915->gpu_error.first_error;
2223 if (!IS_ERR_OR_NULL(error))
2224 i915_gpu_coredump_get(error);
2225 spin_unlock_irq(&i915->gpu_error.lock);
2226
2227 return error;
2228}
2229
2230void i915_reset_error_state(struct drm_i915_private *i915)
2231{
2232 struct i915_gpu_coredump *error;
2233
2234 spin_lock_irq(&i915->gpu_error.lock);
2235 error = i915->gpu_error.first_error;
2236 if (error != ERR_PTR(-ENODEV)) /* if disabled, always disabled */
2237 i915->gpu_error.first_error = NULL;
2238 spin_unlock_irq(&i915->gpu_error.lock);
2239
2240 if (!IS_ERR_OR_NULL(error))
2241 i915_gpu_coredump_put(error);
2242}
2243
2244void i915_disable_error_state(struct drm_i915_private *i915, int err)
2245{
2246 spin_lock_irq(&i915->gpu_error.lock);
2247 if (!i915->gpu_error.first_error)
2248 i915->gpu_error.first_error = ERR_PTR(err);
2249 spin_unlock_irq(&i915->gpu_error.lock);
2250}
2251
2252#if IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM)
2253void intel_klog_error_capture(struct intel_gt *gt,
2254 intel_engine_mask_t engine_mask)
2255{
2256 static int g_count;
2257 struct drm_i915_private *i915 = gt->i915;
2258 struct i915_gpu_coredump *error;
2259 intel_wakeref_t wakeref;
2260 size_t buf_size = PAGE_SIZE * 128;
2261 size_t pos_err;
2262 char *buf, *ptr, *next;
2263 int l_count = g_count++;
2264 int line = 0;
2265
2266 /* Can't allocate memory during a reset */
2267 if (test_bit(I915_RESET_BACKOFF, >->reset.flags)) {
2268 drm_err(>->i915->drm, "[Capture/%d.%d] Inside GT reset, skipping error capture :(\n",
2269 l_count, line++);
2270 return;
2271 }
2272
2273 error = READ_ONCE(i915->gpu_error.first_error);
2274 if (error) {
2275 drm_err(&i915->drm, "[Capture/%d.%d] Clearing existing error capture first...\n",
2276 l_count, line++);
2277 i915_reset_error_state(i915);
2278 }
2279
2280 with_intel_runtime_pm(&i915->runtime_pm, wakeref)
2281 error = i915_gpu_coredump(gt, engine_mask, CORE_DUMP_FLAG_NONE);
2282
2283 if (IS_ERR(error)) {
2284 drm_err(&i915->drm, "[Capture/%d.%d] Failed to capture error capture: %ld!\n",
2285 l_count, line++, PTR_ERR(error));
2286 return;
2287 }
2288
2289 buf = kvmalloc(buf_size, GFP_KERNEL);
2290 if (!buf) {
2291 drm_err(&i915->drm, "[Capture/%d.%d] Failed to allocate buffer for error capture!\n",
2292 l_count, line++);
2293 i915_gpu_coredump_put(error);
2294 return;
2295 }
2296
2297 drm_info(&i915->drm, "[Capture/%d.%d] Dumping i915 error capture for %ps...\n",
2298 l_count, line++, __builtin_return_address(0));
2299
2300 /* Largest string length safe to print via dmesg */
2301# define MAX_CHUNK 800
2302
2303 pos_err = 0;
2304 while (1) {
2305 ssize_t got = i915_gpu_coredump_copy_to_buffer(error, buf, pos_err, buf_size - 1);
2306
2307 if (got <= 0)
2308 break;
2309
2310 buf[got] = 0;
2311 pos_err += got;
2312
2313 ptr = buf;
2314 while (got > 0) {
2315 size_t count;
2316 char tag[2];
2317
2318 next = strnchr(ptr, got, '\n');
2319 if (next) {
2320 count = next - ptr;
2321 *next = 0;
2322 tag[0] = '>';
2323 tag[1] = '<';
2324 } else {
2325 count = got;
2326 tag[0] = '}';
2327 tag[1] = '{';
2328 }
2329
2330 if (count > MAX_CHUNK) {
2331 size_t pos;
2332 char *ptr2 = ptr;
2333
2334 for (pos = MAX_CHUNK; pos < count; pos += MAX_CHUNK) {
2335 char chr = ptr[pos];
2336
2337 ptr[pos] = 0;
2338 drm_info(&i915->drm, "[Capture/%d.%d] }%s{\n",
2339 l_count, line++, ptr2);
2340 ptr[pos] = chr;
2341 ptr2 = ptr + pos;
2342
2343 /*
2344 * If spewing large amounts of data via a serial console,
2345 * this can be a very slow process. So be friendly and try
2346 * not to cause 'softlockup on CPU' problems.
2347 */
2348 cond_resched();
2349 }
2350
2351 if (ptr2 < (ptr + count))
2352 drm_info(&i915->drm, "[Capture/%d.%d] %c%s%c\n",
2353 l_count, line++, tag[0], ptr2, tag[1]);
2354 else if (tag[0] == '>')
2355 drm_info(&i915->drm, "[Capture/%d.%d] ><\n",
2356 l_count, line++);
2357 } else {
2358 drm_info(&i915->drm, "[Capture/%d.%d] %c%s%c\n",
2359 l_count, line++, tag[0], ptr, tag[1]);
2360 }
2361
2362 ptr = next;
2363 got -= count;
2364 if (next) {
2365 ptr++;
2366 got--;
2367 }
2368
2369 /* As above. */
2370 cond_resched();
2371 }
2372
2373 if (got)
2374 drm_info(&i915->drm, "[Capture/%d.%d] Got %zd bytes remaining!\n",
2375 l_count, line++, got);
2376 }
2377
2378 kvfree(buf);
2379
2380 drm_info(&i915->drm, "[Capture/%d.%d] Dumped %zd bytes\n", l_count, line++, pos_err);
2381}
2382#endif
2383
2384static ssize_t gpu_state_read(struct file *file, char __user *ubuf,
2385 size_t count, loff_t *pos)
2386{
2387 struct i915_gpu_coredump *error;
2388 ssize_t ret;
2389 void *buf;
2390
2391 error = file->private_data;
2392 if (!error)
2393 return 0;
2394
2395 /* Bounce buffer required because of kernfs __user API convenience. */
2396 buf = kmalloc(count, GFP_KERNEL);
2397 if (!buf)
2398 return -ENOMEM;
2399
2400 ret = i915_gpu_coredump_copy_to_buffer(error, buf, *pos, count);
2401 if (ret <= 0)
2402 goto out;
2403
2404 if (!copy_to_user(ubuf, buf, ret))
2405 *pos += ret;
2406 else
2407 ret = -EFAULT;
2408
2409out:
2410 kfree(buf);
2411 return ret;
2412}
2413
2414static int gpu_state_release(struct inode *inode, struct file *file)
2415{
2416 i915_gpu_coredump_put(file->private_data);
2417 return 0;
2418}
2419
2420static int i915_gpu_info_open(struct inode *inode, struct file *file)
2421{
2422 struct drm_i915_private *i915 = inode->i_private;
2423 struct i915_gpu_coredump *gpu;
2424 intel_wakeref_t wakeref;
2425
2426 gpu = NULL;
2427 with_intel_runtime_pm(&i915->runtime_pm, wakeref)
2428 gpu = i915_gpu_coredump(to_gt(i915), ALL_ENGINES, CORE_DUMP_FLAG_NONE);
2429
2430 if (IS_ERR(gpu))
2431 return PTR_ERR(gpu);
2432
2433 file->private_data = gpu;
2434 return 0;
2435}
2436
2437static const struct file_operations i915_gpu_info_fops = {
2438 .owner = THIS_MODULE,
2439 .open = i915_gpu_info_open,
2440 .read = gpu_state_read,
2441 .llseek = default_llseek,
2442 .release = gpu_state_release,
2443};
2444
2445static ssize_t
2446i915_error_state_write(struct file *filp,
2447 const char __user *ubuf,
2448 size_t cnt,
2449 loff_t *ppos)
2450{
2451 struct i915_gpu_coredump *error = filp->private_data;
2452
2453 if (!error)
2454 return 0;
2455
2456 drm_dbg(&error->i915->drm, "Resetting error state\n");
2457 i915_reset_error_state(error->i915);
2458
2459 return cnt;
2460}
2461
2462static int i915_error_state_open(struct inode *inode, struct file *file)
2463{
2464 struct i915_gpu_coredump *error;
2465
2466 error = i915_first_error_state(inode->i_private);
2467 if (IS_ERR(error))
2468 return PTR_ERR(error);
2469
2470 file->private_data = error;
2471 return 0;
2472}
2473
2474static const struct file_operations i915_error_state_fops = {
2475 .owner = THIS_MODULE,
2476 .open = i915_error_state_open,
2477 .read = gpu_state_read,
2478 .write = i915_error_state_write,
2479 .llseek = default_llseek,
2480 .release = gpu_state_release,
2481};
2482
2483void i915_gpu_error_debugfs_register(struct drm_i915_private *i915)
2484{
2485 struct drm_minor *minor = i915->drm.primary;
2486
2487 debugfs_create_file("i915_error_state", 0644, minor->debugfs_root, i915,
2488 &i915_error_state_fops);
2489 debugfs_create_file("i915_gpu_info", 0644, minor->debugfs_root, i915,
2490 &i915_gpu_info_fops);
2491}
2492
2493static ssize_t error_state_read(struct file *filp, struct kobject *kobj,
2494 struct bin_attribute *attr, char *buf,
2495 loff_t off, size_t count)
2496{
2497
2498 struct device *kdev = kobj_to_dev(kobj);
2499 struct drm_i915_private *i915 = kdev_minor_to_i915(kdev);
2500 struct i915_gpu_coredump *gpu;
2501 ssize_t ret = 0;
2502
2503 /*
2504 * FIXME: Concurrent clients triggering resets and reading + clearing
2505 * dumps can cause inconsistent sysfs reads when a user calls in with a
2506 * non-zero offset to complete a prior partial read but the
2507 * gpu_coredump has been cleared or replaced.
2508 */
2509
2510 gpu = i915_first_error_state(i915);
2511 if (IS_ERR(gpu)) {
2512 ret = PTR_ERR(gpu);
2513 } else if (gpu) {
2514 ret = i915_gpu_coredump_copy_to_buffer(gpu, buf, off, count);
2515 i915_gpu_coredump_put(gpu);
2516 } else {
2517 const char *str = "No error state collected\n";
2518 size_t len = strlen(str);
2519
2520 if (off < len) {
2521 ret = min_t(size_t, count, len - off);
2522 memcpy(buf, str + off, ret);
2523 }
2524 }
2525
2526 return ret;
2527}
2528
2529static ssize_t error_state_write(struct file *file, struct kobject *kobj,
2530 struct bin_attribute *attr, char *buf,
2531 loff_t off, size_t count)
2532{
2533 struct device *kdev = kobj_to_dev(kobj);
2534 struct drm_i915_private *dev_priv = kdev_minor_to_i915(kdev);
2535
2536 drm_dbg(&dev_priv->drm, "Resetting error state\n");
2537 i915_reset_error_state(dev_priv);
2538
2539 return count;
2540}
2541
2542static const struct bin_attribute error_state_attr = {
2543 .attr.name = "error",
2544 .attr.mode = S_IRUSR | S_IWUSR,
2545 .size = 0,
2546 .read = error_state_read,
2547 .write = error_state_write,
2548};
2549
2550void i915_gpu_error_sysfs_setup(struct drm_i915_private *i915)
2551{
2552 struct device *kdev = i915->drm.primary->kdev;
2553
2554 if (sysfs_create_bin_file(&kdev->kobj, &error_state_attr))
2555 drm_err(&i915->drm, "error_state sysfs setup failed\n");
2556}
2557
2558void i915_gpu_error_sysfs_teardown(struct drm_i915_private *i915)
2559{
2560 struct device *kdev = i915->drm.primary->kdev;
2561
2562 sysfs_remove_bin_file(&kdev->kobj, &error_state_attr);
2563}