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1// SPDX-License-Identifier: MIT
2/*
3 * Copyright © 2014-2019 Intel Corporation
4 */
5
6#include <linux/debugfs.h>
7
8#include "gt/intel_gt.h"
9#include "i915_drv.h"
10#include "i915_memcpy.h"
11#include "intel_guc_log.h"
12
13static void guc_log_capture_logs(struct intel_guc_log *log);
14
15/**
16 * DOC: GuC firmware log
17 *
18 * Firmware log is enabled by setting i915.guc_log_level to the positive level.
19 * Log data is printed out via reading debugfs i915_guc_log_dump. Reading from
20 * i915_guc_load_status will print out firmware loading status and scratch
21 * registers value.
22 */
23
24static int guc_action_flush_log_complete(struct intel_guc *guc)
25{
26 u32 action[] = {
27 INTEL_GUC_ACTION_LOG_BUFFER_FILE_FLUSH_COMPLETE
28 };
29
30 return intel_guc_send(guc, action, ARRAY_SIZE(action));
31}
32
33static int guc_action_flush_log(struct intel_guc *guc)
34{
35 u32 action[] = {
36 INTEL_GUC_ACTION_FORCE_LOG_BUFFER_FLUSH,
37 0
38 };
39
40 return intel_guc_send(guc, action, ARRAY_SIZE(action));
41}
42
43static int guc_action_control_log(struct intel_guc *guc, bool enable,
44 bool default_logging, u32 verbosity)
45{
46 u32 action[] = {
47 INTEL_GUC_ACTION_UK_LOG_ENABLE_LOGGING,
48 (enable ? GUC_LOG_CONTROL_LOGGING_ENABLED : 0) |
49 (verbosity << GUC_LOG_CONTROL_VERBOSITY_SHIFT) |
50 (default_logging ? GUC_LOG_CONTROL_DEFAULT_LOGGING : 0)
51 };
52
53 GEM_BUG_ON(verbosity > GUC_LOG_VERBOSITY_MAX);
54
55 return intel_guc_send(guc, action, ARRAY_SIZE(action));
56}
57
58static void guc_log_enable_flush_events(struct intel_guc_log *log)
59{
60 intel_guc_enable_msg(log_to_guc(log),
61 INTEL_GUC_RECV_MSG_FLUSH_LOG_BUFFER |
62 INTEL_GUC_RECV_MSG_CRASH_DUMP_POSTED);
63}
64
65static void guc_log_disable_flush_events(struct intel_guc_log *log)
66{
67 intel_guc_disable_msg(log_to_guc(log),
68 INTEL_GUC_RECV_MSG_FLUSH_LOG_BUFFER |
69 INTEL_GUC_RECV_MSG_CRASH_DUMP_POSTED);
70}
71
72/*
73 * Sub buffer switch callback. Called whenever relay has to switch to a new
74 * sub buffer, relay stays on the same sub buffer if 0 is returned.
75 */
76static int subbuf_start_callback(struct rchan_buf *buf,
77 void *subbuf,
78 void *prev_subbuf,
79 size_t prev_padding)
80{
81 /*
82 * Use no-overwrite mode by default, where relay will stop accepting
83 * new data if there are no empty sub buffers left.
84 * There is no strict synchronization enforced by relay between Consumer
85 * and Producer. In overwrite mode, there is a possibility of getting
86 * inconsistent/garbled data, the producer could be writing on to the
87 * same sub buffer from which Consumer is reading. This can't be avoided
88 * unless Consumer is fast enough and can always run in tandem with
89 * Producer.
90 */
91 if (relay_buf_full(buf))
92 return 0;
93
94 return 1;
95}
96
97/*
98 * file_create() callback. Creates relay file in debugfs.
99 */
100static struct dentry *create_buf_file_callback(const char *filename,
101 struct dentry *parent,
102 umode_t mode,
103 struct rchan_buf *buf,
104 int *is_global)
105{
106 struct dentry *buf_file;
107
108 /*
109 * This to enable the use of a single buffer for the relay channel and
110 * correspondingly have a single file exposed to User, through which
111 * it can collect the logs in order without any post-processing.
112 * Need to set 'is_global' even if parent is NULL for early logging.
113 */
114 *is_global = 1;
115
116 if (!parent)
117 return NULL;
118
119 buf_file = debugfs_create_file(filename, mode,
120 parent, buf, &relay_file_operations);
121 if (IS_ERR(buf_file))
122 return NULL;
123
124 return buf_file;
125}
126
127/*
128 * file_remove() default callback. Removes relay file in debugfs.
129 */
130static int remove_buf_file_callback(struct dentry *dentry)
131{
132 debugfs_remove(dentry);
133 return 0;
134}
135
136/* relay channel callbacks */
137static const struct rchan_callbacks relay_callbacks = {
138 .subbuf_start = subbuf_start_callback,
139 .create_buf_file = create_buf_file_callback,
140 .remove_buf_file = remove_buf_file_callback,
141};
142
143static void guc_move_to_next_buf(struct intel_guc_log *log)
144{
145 /*
146 * Make sure the updates made in the sub buffer are visible when
147 * Consumer sees the following update to offset inside the sub buffer.
148 */
149 smp_wmb();
150
151 /* All data has been written, so now move the offset of sub buffer. */
152 relay_reserve(log->relay.channel, log->vma->obj->base.size);
153
154 /* Switch to the next sub buffer */
155 relay_flush(log->relay.channel);
156}
157
158static void *guc_get_write_buffer(struct intel_guc_log *log)
159{
160 /*
161 * Just get the base address of a new sub buffer and copy data into it
162 * ourselves. NULL will be returned in no-overwrite mode, if all sub
163 * buffers are full. Could have used the relay_write() to indirectly
164 * copy the data, but that would have been bit convoluted, as we need to
165 * write to only certain locations inside a sub buffer which cannot be
166 * done without using relay_reserve() along with relay_write(). So its
167 * better to use relay_reserve() alone.
168 */
169 return relay_reserve(log->relay.channel, 0);
170}
171
172static bool guc_check_log_buf_overflow(struct intel_guc_log *log,
173 enum guc_log_buffer_type type,
174 unsigned int full_cnt)
175{
176 unsigned int prev_full_cnt = log->stats[type].sampled_overflow;
177 bool overflow = false;
178
179 if (full_cnt != prev_full_cnt) {
180 overflow = true;
181
182 log->stats[type].overflow = full_cnt;
183 log->stats[type].sampled_overflow += full_cnt - prev_full_cnt;
184
185 if (full_cnt < prev_full_cnt) {
186 /* buffer_full_cnt is a 4 bit counter */
187 log->stats[type].sampled_overflow += 16;
188 }
189
190 dev_notice_ratelimited(guc_to_gt(log_to_guc(log))->i915->drm.dev,
191 "GuC log buffer overflow\n");
192 }
193
194 return overflow;
195}
196
197static unsigned int guc_get_log_buffer_size(enum guc_log_buffer_type type)
198{
199 switch (type) {
200 case GUC_ISR_LOG_BUFFER:
201 return ISR_BUFFER_SIZE;
202 case GUC_DPC_LOG_BUFFER:
203 return DPC_BUFFER_SIZE;
204 case GUC_CRASH_DUMP_LOG_BUFFER:
205 return CRASH_BUFFER_SIZE;
206 default:
207 MISSING_CASE(type);
208 }
209
210 return 0;
211}
212
213static void guc_read_update_log_buffer(struct intel_guc_log *log)
214{
215 unsigned int buffer_size, read_offset, write_offset, bytes_to_copy, full_cnt;
216 struct guc_log_buffer_state *log_buf_state, *log_buf_snapshot_state;
217 struct guc_log_buffer_state log_buf_state_local;
218 enum guc_log_buffer_type type;
219 void *src_data, *dst_data;
220 bool new_overflow;
221
222 mutex_lock(&log->relay.lock);
223
224 if (WARN_ON(!intel_guc_log_relay_created(log)))
225 goto out_unlock;
226
227 /* Get the pointer to shared GuC log buffer */
228 log_buf_state = src_data = log->relay.buf_addr;
229
230 /* Get the pointer to local buffer to store the logs */
231 log_buf_snapshot_state = dst_data = guc_get_write_buffer(log);
232
233 if (unlikely(!log_buf_snapshot_state)) {
234 /*
235 * Used rate limited to avoid deluge of messages, logs might be
236 * getting consumed by User at a slow rate.
237 */
238 DRM_ERROR_RATELIMITED("no sub-buffer to capture logs\n");
239 log->relay.full_count++;
240
241 goto out_unlock;
242 }
243
244 /* Actual logs are present from the 2nd page */
245 src_data += PAGE_SIZE;
246 dst_data += PAGE_SIZE;
247
248 for (type = GUC_ISR_LOG_BUFFER; type < GUC_MAX_LOG_BUFFER; type++) {
249 /*
250 * Make a copy of the state structure, inside GuC log buffer
251 * (which is uncached mapped), on the stack to avoid reading
252 * from it multiple times.
253 */
254 memcpy(&log_buf_state_local, log_buf_state,
255 sizeof(struct guc_log_buffer_state));
256 buffer_size = guc_get_log_buffer_size(type);
257 read_offset = log_buf_state_local.read_ptr;
258 write_offset = log_buf_state_local.sampled_write_ptr;
259 full_cnt = log_buf_state_local.buffer_full_cnt;
260
261 /* Bookkeeping stuff */
262 log->stats[type].flush += log_buf_state_local.flush_to_file;
263 new_overflow = guc_check_log_buf_overflow(log, type, full_cnt);
264
265 /* Update the state of shared log buffer */
266 log_buf_state->read_ptr = write_offset;
267 log_buf_state->flush_to_file = 0;
268 log_buf_state++;
269
270 /* First copy the state structure in snapshot buffer */
271 memcpy(log_buf_snapshot_state, &log_buf_state_local,
272 sizeof(struct guc_log_buffer_state));
273
274 /*
275 * The write pointer could have been updated by GuC firmware,
276 * after sending the flush interrupt to Host, for consistency
277 * set write pointer value to same value of sampled_write_ptr
278 * in the snapshot buffer.
279 */
280 log_buf_snapshot_state->write_ptr = write_offset;
281 log_buf_snapshot_state++;
282
283 /* Now copy the actual logs. */
284 if (unlikely(new_overflow)) {
285 /* copy the whole buffer in case of overflow */
286 read_offset = 0;
287 write_offset = buffer_size;
288 } else if (unlikely((read_offset > buffer_size) ||
289 (write_offset > buffer_size))) {
290 DRM_ERROR("invalid log buffer state\n");
291 /* copy whole buffer as offsets are unreliable */
292 read_offset = 0;
293 write_offset = buffer_size;
294 }
295
296 /* Just copy the newly written data */
297 if (read_offset > write_offset) {
298 i915_memcpy_from_wc(dst_data, src_data, write_offset);
299 bytes_to_copy = buffer_size - read_offset;
300 } else {
301 bytes_to_copy = write_offset - read_offset;
302 }
303 i915_memcpy_from_wc(dst_data + read_offset,
304 src_data + read_offset, bytes_to_copy);
305
306 src_data += buffer_size;
307 dst_data += buffer_size;
308 }
309
310 guc_move_to_next_buf(log);
311
312out_unlock:
313 mutex_unlock(&log->relay.lock);
314}
315
316static void capture_logs_work(struct work_struct *work)
317{
318 struct intel_guc_log *log =
319 container_of(work, struct intel_guc_log, relay.flush_work);
320
321 guc_log_capture_logs(log);
322}
323
324static int guc_log_map(struct intel_guc_log *log)
325{
326 void *vaddr;
327
328 lockdep_assert_held(&log->relay.lock);
329
330 if (!log->vma)
331 return -ENODEV;
332
333 /*
334 * Create a WC (Uncached for read) vmalloc mapping of log
335 * buffer pages, so that we can directly get the data
336 * (up-to-date) from memory.
337 */
338 vaddr = i915_gem_object_pin_map_unlocked(log->vma->obj, I915_MAP_WC);
339 if (IS_ERR(vaddr))
340 return PTR_ERR(vaddr);
341
342 log->relay.buf_addr = vaddr;
343
344 return 0;
345}
346
347static void guc_log_unmap(struct intel_guc_log *log)
348{
349 lockdep_assert_held(&log->relay.lock);
350
351 i915_gem_object_unpin_map(log->vma->obj);
352 log->relay.buf_addr = NULL;
353}
354
355void intel_guc_log_init_early(struct intel_guc_log *log)
356{
357 mutex_init(&log->relay.lock);
358 INIT_WORK(&log->relay.flush_work, capture_logs_work);
359 log->relay.started = false;
360}
361
362static int guc_log_relay_create(struct intel_guc_log *log)
363{
364 struct intel_guc *guc = log_to_guc(log);
365 struct drm_i915_private *dev_priv = guc_to_gt(guc)->i915;
366 struct rchan *guc_log_relay_chan;
367 size_t n_subbufs, subbuf_size;
368 int ret;
369
370 lockdep_assert_held(&log->relay.lock);
371 GEM_BUG_ON(!log->vma);
372
373 /* Keep the size of sub buffers same as shared log buffer */
374 subbuf_size = log->vma->size;
375
376 /*
377 * Store up to 8 snapshots, which is large enough to buffer sufficient
378 * boot time logs and provides enough leeway to User, in terms of
379 * latency, for consuming the logs from relay. Also doesn't take
380 * up too much memory.
381 */
382 n_subbufs = 8;
383
384 guc_log_relay_chan = relay_open("guc_log",
385 dev_priv->drm.primary->debugfs_root,
386 subbuf_size, n_subbufs,
387 &relay_callbacks, dev_priv);
388 if (!guc_log_relay_chan) {
389 DRM_ERROR("Couldn't create relay chan for GuC logging\n");
390
391 ret = -ENOMEM;
392 return ret;
393 }
394
395 GEM_BUG_ON(guc_log_relay_chan->subbuf_size < subbuf_size);
396 log->relay.channel = guc_log_relay_chan;
397
398 return 0;
399}
400
401static void guc_log_relay_destroy(struct intel_guc_log *log)
402{
403 lockdep_assert_held(&log->relay.lock);
404
405 relay_close(log->relay.channel);
406 log->relay.channel = NULL;
407}
408
409static void guc_log_capture_logs(struct intel_guc_log *log)
410{
411 struct intel_guc *guc = log_to_guc(log);
412 struct drm_i915_private *dev_priv = guc_to_gt(guc)->i915;
413 intel_wakeref_t wakeref;
414
415 guc_read_update_log_buffer(log);
416
417 /*
418 * Generally device is expected to be active only at this
419 * time, so get/put should be really quick.
420 */
421 with_intel_runtime_pm(&dev_priv->runtime_pm, wakeref)
422 guc_action_flush_log_complete(guc);
423}
424
425static u32 __get_default_log_level(struct intel_guc_log *log)
426{
427 struct intel_guc *guc = log_to_guc(log);
428 struct drm_i915_private *i915 = guc_to_gt(guc)->i915;
429
430 /* A negative value means "use platform/config default" */
431 if (i915->params.guc_log_level < 0) {
432 return (IS_ENABLED(CONFIG_DRM_I915_DEBUG) ||
433 IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM)) ?
434 GUC_LOG_LEVEL_MAX : GUC_LOG_LEVEL_NON_VERBOSE;
435 }
436
437 if (i915->params.guc_log_level > GUC_LOG_LEVEL_MAX) {
438 DRM_WARN("Incompatible option detected: %s=%d, %s!\n",
439 "guc_log_level", i915->params.guc_log_level,
440 "verbosity too high");
441 return (IS_ENABLED(CONFIG_DRM_I915_DEBUG) ||
442 IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM)) ?
443 GUC_LOG_LEVEL_MAX : GUC_LOG_LEVEL_DISABLED;
444 }
445
446 GEM_BUG_ON(i915->params.guc_log_level < GUC_LOG_LEVEL_DISABLED);
447 GEM_BUG_ON(i915->params.guc_log_level > GUC_LOG_LEVEL_MAX);
448 return i915->params.guc_log_level;
449}
450
451int intel_guc_log_create(struct intel_guc_log *log)
452{
453 struct intel_guc *guc = log_to_guc(log);
454 struct i915_vma *vma;
455 u32 guc_log_size;
456 int ret;
457
458 GEM_BUG_ON(log->vma);
459
460 /*
461 * GuC Log buffer Layout
462 *
463 * +===============================+ 00B
464 * | Crash dump state header |
465 * +-------------------------------+ 32B
466 * | DPC state header |
467 * +-------------------------------+ 64B
468 * | ISR state header |
469 * +-------------------------------+ 96B
470 * | |
471 * +===============================+ PAGE_SIZE (4KB)
472 * | Crash Dump logs |
473 * +===============================+ + CRASH_SIZE
474 * | DPC logs |
475 * +===============================+ + DPC_SIZE
476 * | ISR logs |
477 * +===============================+ + ISR_SIZE
478 */
479 guc_log_size = PAGE_SIZE + CRASH_BUFFER_SIZE + DPC_BUFFER_SIZE +
480 ISR_BUFFER_SIZE;
481
482 vma = intel_guc_allocate_vma(guc, guc_log_size);
483 if (IS_ERR(vma)) {
484 ret = PTR_ERR(vma);
485 goto err;
486 }
487
488 log->vma = vma;
489
490 log->level = __get_default_log_level(log);
491 DRM_DEBUG_DRIVER("guc_log_level=%d (%s, verbose:%s, verbosity:%d)\n",
492 log->level, enableddisabled(log->level),
493 yesno(GUC_LOG_LEVEL_IS_VERBOSE(log->level)),
494 GUC_LOG_LEVEL_TO_VERBOSITY(log->level));
495
496 return 0;
497
498err:
499 DRM_ERROR("Failed to allocate GuC log buffer. %d\n", ret);
500 return ret;
501}
502
503void intel_guc_log_destroy(struct intel_guc_log *log)
504{
505 i915_vma_unpin_and_release(&log->vma, 0);
506}
507
508int intel_guc_log_set_level(struct intel_guc_log *log, u32 level)
509{
510 struct intel_guc *guc = log_to_guc(log);
511 struct drm_i915_private *dev_priv = guc_to_gt(guc)->i915;
512 intel_wakeref_t wakeref;
513 int ret = 0;
514
515 BUILD_BUG_ON(GUC_LOG_VERBOSITY_MIN != 0);
516 GEM_BUG_ON(!log->vma);
517
518 /*
519 * GuC is recognizing log levels starting from 0 to max, we're using 0
520 * as indication that logging should be disabled.
521 */
522 if (level < GUC_LOG_LEVEL_DISABLED || level > GUC_LOG_LEVEL_MAX)
523 return -EINVAL;
524
525 mutex_lock(&dev_priv->drm.struct_mutex);
526
527 if (log->level == level)
528 goto out_unlock;
529
530 with_intel_runtime_pm(&dev_priv->runtime_pm, wakeref)
531 ret = guc_action_control_log(guc,
532 GUC_LOG_LEVEL_IS_VERBOSE(level),
533 GUC_LOG_LEVEL_IS_ENABLED(level),
534 GUC_LOG_LEVEL_TO_VERBOSITY(level));
535 if (ret) {
536 DRM_DEBUG_DRIVER("guc_log_control action failed %d\n", ret);
537 goto out_unlock;
538 }
539
540 log->level = level;
541
542out_unlock:
543 mutex_unlock(&dev_priv->drm.struct_mutex);
544
545 return ret;
546}
547
548bool intel_guc_log_relay_created(const struct intel_guc_log *log)
549{
550 return log->relay.buf_addr;
551}
552
553int intel_guc_log_relay_open(struct intel_guc_log *log)
554{
555 int ret;
556
557 if (!log->vma)
558 return -ENODEV;
559
560 mutex_lock(&log->relay.lock);
561
562 if (intel_guc_log_relay_created(log)) {
563 ret = -EEXIST;
564 goto out_unlock;
565 }
566
567 /*
568 * We require SSE 4.1 for fast reads from the GuC log buffer and
569 * it should be present on the chipsets supporting GuC based
570 * submisssions.
571 */
572 if (!i915_has_memcpy_from_wc()) {
573 ret = -ENXIO;
574 goto out_unlock;
575 }
576
577 ret = guc_log_relay_create(log);
578 if (ret)
579 goto out_unlock;
580
581 ret = guc_log_map(log);
582 if (ret)
583 goto out_relay;
584
585 mutex_unlock(&log->relay.lock);
586
587 return 0;
588
589out_relay:
590 guc_log_relay_destroy(log);
591out_unlock:
592 mutex_unlock(&log->relay.lock);
593
594 return ret;
595}
596
597int intel_guc_log_relay_start(struct intel_guc_log *log)
598{
599 if (log->relay.started)
600 return -EEXIST;
601
602 guc_log_enable_flush_events(log);
603
604 /*
605 * When GuC is logging without us relaying to userspace, we're ignoring
606 * the flush notification. This means that we need to unconditionally
607 * flush on relay enabling, since GuC only notifies us once.
608 */
609 queue_work(system_highpri_wq, &log->relay.flush_work);
610
611 log->relay.started = true;
612
613 return 0;
614}
615
616void intel_guc_log_relay_flush(struct intel_guc_log *log)
617{
618 struct intel_guc *guc = log_to_guc(log);
619 intel_wakeref_t wakeref;
620
621 if (!log->relay.started)
622 return;
623
624 /*
625 * Before initiating the forceful flush, wait for any pending/ongoing
626 * flush to complete otherwise forceful flush may not actually happen.
627 */
628 flush_work(&log->relay.flush_work);
629
630 with_intel_runtime_pm(guc_to_gt(guc)->uncore->rpm, wakeref)
631 guc_action_flush_log(guc);
632
633 /* GuC would have updated log buffer by now, so capture it */
634 guc_log_capture_logs(log);
635}
636
637/*
638 * Stops the relay log. Called from intel_guc_log_relay_close(), so no
639 * possibility of race with start/flush since relay_write cannot race
640 * relay_close.
641 */
642static void guc_log_relay_stop(struct intel_guc_log *log)
643{
644 struct intel_guc *guc = log_to_guc(log);
645 struct drm_i915_private *i915 = guc_to_gt(guc)->i915;
646
647 if (!log->relay.started)
648 return;
649
650 guc_log_disable_flush_events(log);
651 intel_synchronize_irq(i915);
652
653 flush_work(&log->relay.flush_work);
654
655 log->relay.started = false;
656}
657
658void intel_guc_log_relay_close(struct intel_guc_log *log)
659{
660 guc_log_relay_stop(log);
661
662 mutex_lock(&log->relay.lock);
663 GEM_BUG_ON(!intel_guc_log_relay_created(log));
664 guc_log_unmap(log);
665 guc_log_relay_destroy(log);
666 mutex_unlock(&log->relay.lock);
667}
668
669void intel_guc_log_handle_flush_event(struct intel_guc_log *log)
670{
671 queue_work(system_highpri_wq, &log->relay.flush_work);
672}
673
674static const char *
675stringify_guc_log_type(enum guc_log_buffer_type type)
676{
677 switch (type) {
678 case GUC_ISR_LOG_BUFFER:
679 return "ISR";
680 case GUC_DPC_LOG_BUFFER:
681 return "DPC";
682 case GUC_CRASH_DUMP_LOG_BUFFER:
683 return "CRASH";
684 default:
685 MISSING_CASE(type);
686 }
687
688 return "";
689}
690
691/**
692 * intel_guc_log_info - dump information about GuC log relay
693 * @log: the GuC log
694 * @p: the &drm_printer
695 *
696 * Pretty printer for GuC log info
697 */
698void intel_guc_log_info(struct intel_guc_log *log, struct drm_printer *p)
699{
700 enum guc_log_buffer_type type;
701
702 if (!intel_guc_log_relay_created(log)) {
703 drm_puts(p, "GuC log relay not created\n");
704 return;
705 }
706
707 drm_puts(p, "GuC logging stats:\n");
708
709 drm_printf(p, "\tRelay full count: %u\n", log->relay.full_count);
710
711 for (type = GUC_ISR_LOG_BUFFER; type < GUC_MAX_LOG_BUFFER; type++) {
712 drm_printf(p, "\t%s:\tflush count %10u, overflow count %10u\n",
713 stringify_guc_log_type(type),
714 log->stats[type].flush,
715 log->stats[type].sampled_overflow);
716 }
717}
718
719/**
720 * intel_guc_log_dump - dump the contents of the GuC log
721 * @log: the GuC log
722 * @p: the &drm_printer
723 * @dump_load_err: dump the log saved on GuC load error
724 *
725 * Pretty printer for the GuC log
726 */
727int intel_guc_log_dump(struct intel_guc_log *log, struct drm_printer *p,
728 bool dump_load_err)
729{
730 struct intel_guc *guc = log_to_guc(log);
731 struct intel_uc *uc = container_of(guc, struct intel_uc, guc);
732 struct drm_i915_gem_object *obj = NULL;
733 u32 *map;
734 int i = 0;
735
736 if (!intel_guc_is_supported(guc))
737 return -ENODEV;
738
739 if (dump_load_err)
740 obj = uc->load_err_log;
741 else if (guc->log.vma)
742 obj = guc->log.vma->obj;
743
744 if (!obj)
745 return 0;
746
747 map = i915_gem_object_pin_map_unlocked(obj, I915_MAP_WC);
748 if (IS_ERR(map)) {
749 DRM_DEBUG("Failed to pin object\n");
750 drm_puts(p, "(log data unaccessible)\n");
751 return PTR_ERR(map);
752 }
753
754 for (i = 0; i < obj->base.size / sizeof(u32); i += 4)
755 drm_printf(p, "0x%08x 0x%08x 0x%08x 0x%08x\n",
756 *(map + i), *(map + i + 1),
757 *(map + i + 2), *(map + i + 3));
758
759 drm_puts(p, "\n");
760
761 i915_gem_object_unpin_map(obj);
762
763 return 0;
764}