summaryrefslogtreecommitdiffstats
path: root/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c
blob: e917985bbbe6d7d140fed6c59139f69bc3a760ba (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright(C) 2015-2018 Linaro Limited.
 *
 * Author: Tor Jeremiassen <tor@ti.com>
 * Author: Mathieu Poirier <mathieu.poirier@linaro.org>
 */

#include <asm/bug.h>
#include <linux/coresight-pmu.h>
#include <linux/err.h>
#include <linux/list.h>
#include <linux/zalloc.h>
#include <stdlib.h>
#include <opencsd/c_api/opencsd_c_api.h>

#include "cs-etm.h"
#include "cs-etm-decoder.h"
#include "debug.h"
#include "intlist.h"

/* use raw logging */
#ifdef CS_DEBUG_RAW
#define CS_LOG_RAW_FRAMES
#ifdef CS_RAW_PACKED
#define CS_RAW_DEBUG_FLAGS (OCSD_DFRMTR_UNPACKED_RAW_OUT | \
			    OCSD_DFRMTR_PACKED_RAW_OUT)
#else
#define CS_RAW_DEBUG_FLAGS (OCSD_DFRMTR_UNPACKED_RAW_OUT)
#endif
#endif

/*
 * Assume a maximum of 0.1ns elapsed per instruction. This would be the
 * case with a theoretical 10GHz core executing 1 instruction per cycle.
 * Used to estimate the sample time for synthesized instructions because
 * Coresight only emits a timestamp for a range of instructions rather
 * than per instruction.
 */
const u32 INSTR_PER_NS = 10;

struct cs_etm_decoder {
	void *data;
	void (*packet_printer)(const char *msg);
	bool suppress_printing;
	dcd_tree_handle_t dcd_tree;
	cs_etm_mem_cb_type mem_access;
	ocsd_datapath_resp_t prev_return;
	const char *decoder_name;
};

static u32
cs_etm_decoder__mem_access(const void *context,
			   const ocsd_vaddr_t address,
			   const ocsd_mem_space_acc_t mem_space,
			   const u8 trace_chan_id,
			   const u32 req_size,
			   u8 *buffer)
{
	struct cs_etm_decoder *decoder = (struct cs_etm_decoder *) context;

	return decoder->mem_access(decoder->data, trace_chan_id, address,
				   req_size, buffer, mem_space);
}

int cs_etm_decoder__add_mem_access_cb(struct cs_etm_decoder *decoder,
				      u64 start, u64 end,
				      cs_etm_mem_cb_type cb_func)
{
	decoder->mem_access = cb_func;

	if (ocsd_dt_add_callback_trcid_mem_acc(decoder->dcd_tree, start, end,
					       OCSD_MEM_SPACE_ANY,
					       cs_etm_decoder__mem_access,
					       decoder))
		return -1;

	return 0;
}

int cs_etm_decoder__reset(struct cs_etm_decoder *decoder)
{
	ocsd_datapath_resp_t dp_ret;

	decoder->prev_return = OCSD_RESP_CONT;
	decoder->suppress_printing = true;
	dp_ret = ocsd_dt_process_data(decoder->dcd_tree, OCSD_OP_RESET,
				      0, 0, NULL, NULL);
	decoder->suppress_printing = false;
	if (OCSD_DATA_RESP_IS_FATAL(dp_ret))
		return -1;

	return 0;
}

int cs_etm_decoder__get_packet(struct cs_etm_packet_queue *packet_queue,
			       struct cs_etm_packet *packet)
{
	if (!packet_queue || !packet)
		return -EINVAL;

	/* Nothing to do, might as well just return */
	if (packet_queue->packet_count == 0)
		return 0;
	/*
	 * The queueing process in function cs_etm_decoder__buffer_packet()
	 * increments the tail *before* using it.  This is somewhat counter
	 * intuitive but it has the advantage of centralizing tail management
	 * at a single location.  Because of that we need to follow the same
	 * heuristic with the head, i.e we increment it before using its
	 * value.  Otherwise the first element of the packet queue is not
	 * used.
	 */
	packet_queue->head = (packet_queue->head + 1) &
			     (CS_ETM_PACKET_MAX_BUFFER - 1);

	*packet = packet_queue->packet_buffer[packet_queue->head];

	packet_queue->packet_count--;

	return 1;
}

/*
 * Calculate the number of nanoseconds elapsed.
 *
 * instr_count is updated in place with the remainder of the instructions
 * which didn't make up a whole nanosecond.
 */
static u32 cs_etm_decoder__dec_instr_count_to_ns(u32 *instr_count)
{
	const u32 instr_copy = *instr_count;

	*instr_count %= INSTR_PER_NS;
	return instr_copy / INSTR_PER_NS;
}

static int cs_etm_decoder__gen_etmv3_config(struct cs_etm_trace_params *params,
					    ocsd_etmv3_cfg *config)
{
	config->reg_idr = params->etmv3.reg_idr;
	config->reg_ctrl = params->etmv3.reg_ctrl;
	config->reg_ccer = params->etmv3.reg_ccer;
	config->reg_trc_id = params->etmv3.reg_trc_id;
	config->arch_ver = ARCH_V7;
	config->core_prof = profile_CortexA;

	return 0;
}

#define TRCIDR1_TRCARCHMIN_SHIFT 4
#define TRCIDR1_TRCARCHMIN_MASK  GENMASK(7, 4)
#define TRCIDR1_TRCARCHMIN(x)    (((x) & TRCIDR1_TRCARCHMIN_MASK) >> TRCIDR1_TRCARCHMIN_SHIFT)

static enum _ocsd_arch_version cs_etm_decoder__get_etmv4_arch_ver(u32 reg_idr1)
{
	/*
	 * For ETMv4 if the trace minor version is 4 or more then we can assume
	 * the architecture is ARCH_AA64 rather than just V8.
	 * ARCH_V8 = V8 architecture
	 * ARCH_AA64 = Min v8r3 plus additional AA64 PE features
	 */
	return TRCIDR1_TRCARCHMIN(reg_idr1) >= 4 ? ARCH_AA64 : ARCH_V8;
}

static void cs_etm_decoder__gen_etmv4_config(struct cs_etm_trace_params *params,
					     ocsd_etmv4_cfg *config)
{
	config->reg_configr = params->etmv4.reg_configr;
	config->reg_traceidr = params->etmv4.reg_traceidr;
	config->reg_idr0 = params->etmv4.reg_idr0;
	config->reg_idr1 = params->etmv4.reg_idr1;
	config->reg_idr2 = params->etmv4.reg_idr2;
	config->reg_idr8 = params->etmv4.reg_idr8;
	config->reg_idr9 = 0;
	config->reg_idr10 = 0;
	config->reg_idr11 = 0;
	config->reg_idr12 = 0;
	config->reg_idr13 = 0;
	config->arch_ver = cs_etm_decoder__get_etmv4_arch_ver(params->etmv4.reg_idr1);
	config->core_prof = profile_CortexA;
}

static void cs_etm_decoder__gen_ete_config(struct cs_etm_trace_params *params,
					   ocsd_ete_cfg *config)
{
	config->reg_configr = params->ete.reg_configr;
	config->reg_traceidr = params->ete.reg_traceidr;
	config->reg_idr0 = params->ete.reg_idr0;
	config->reg_idr1 = params->ete.reg_idr1;
	config->reg_idr2 = params->ete.reg_idr2;
	config->reg_idr8 = params->ete.reg_idr8;
	config->reg_devarch = params->ete.reg_devarch;
	config->arch_ver = ARCH_AA64;
	config->core_prof = profile_CortexA;
}

static void cs_etm_decoder__print_str_cb(const void *p_context,
					 const char *msg,
					 const int str_len)
{
	const struct cs_etm_decoder *decoder = p_context;

	if (p_context && str_len && !decoder->suppress_printing)
		decoder->packet_printer(msg);
}

static int
cs_etm_decoder__init_def_logger_printing(struct cs_etm_decoder_params *d_params,
					 struct cs_etm_decoder *decoder)
{
	int ret = 0;

	if (d_params->packet_printer == NULL)
		return -1;

	decoder->packet_printer = d_params->packet_printer;

	/*
	 * Set up a library default logger to process any printers
	 * (packet/raw frame) we add later.
	 */
	ret = ocsd_def_errlog_init(OCSD_ERR_SEV_ERROR, 1);
	if (ret != 0)
		return -1;

	/* no stdout / err / file output */
	ret = ocsd_def_errlog_config_output(C_API_MSGLOGOUT_FLG_NONE, NULL);
	if (ret != 0)
		return -1;

	/*
	 * Set the string CB for the default logger, passes strings to
	 * perf print logger.
	 */
	ret = ocsd_def_errlog_set_strprint_cb(decoder->dcd_tree,
					      (void *)decoder,
					      cs_etm_decoder__print_str_cb);
	if (ret != 0)
		ret = -1;

	return 0;
}

#ifdef CS_LOG_RAW_FRAMES
static void
cs_etm_decoder__init_raw_frame_logging(struct cs_etm_decoder_params *d_params,
				       struct cs_etm_decoder *decoder)
{
	/* Only log these during a --dump operation */
	if (d_params->operation == CS_ETM_OPERATION_PRINT) {
		/* set up a library default logger to process the
		 *  raw frame printer we add later
		 */
		ocsd_def_errlog_init(OCSD_ERR_SEV_ERROR, 1);

		/* no stdout / err / file output */
		ocsd_def_errlog_config_output(C_API_MSGLOGOUT_FLG_NONE, NULL);

		/* set the string CB for the default logger,
		 * passes strings to perf print logger.
		 */
		ocsd_def_errlog_set_strprint_cb(decoder->dcd_tree,
						(void *)decoder,
						cs_etm_decoder__print_str_cb);

		/* use the built in library printer for the raw frames */
		ocsd_dt_set_raw_frame_printer(decoder->dcd_tree,
					      CS_RAW_DEBUG_FLAGS);
	}
}
#else
static void
cs_etm_decoder__init_raw_frame_logging(
		struct cs_etm_decoder_params *d_params __maybe_unused,
		struct cs_etm_decoder *decoder __maybe_unused)
{
}
#endif

static ocsd_datapath_resp_t
cs_etm_decoder__do_soft_timestamp(struct cs_etm_queue *etmq,
				  struct cs_etm_packet_queue *packet_queue,
				  const uint8_t trace_chan_id)
{
	u64 estimated_ts;

	/* No timestamp packet has been received, nothing to do */
	if (!packet_queue->next_cs_timestamp)
		return OCSD_RESP_CONT;

	estimated_ts = packet_queue->cs_timestamp +
			cs_etm_decoder__dec_instr_count_to_ns(&packet_queue->instr_count);

	/* Estimated TS can never be higher than the next real one in the trace */
	packet_queue->cs_timestamp = min(packet_queue->next_cs_timestamp, estimated_ts);

	/* Tell the front end which traceid_queue needs attention */
	cs_etm__etmq_set_traceid_queue_timestamp(etmq, trace_chan_id);

	return OCSD_RESP_WAIT;
}

static ocsd_datapath_resp_t
cs_etm_decoder__do_hard_timestamp(struct cs_etm_queue *etmq,
				  const ocsd_generic_trace_elem *elem,
				  const uint8_t trace_chan_id,
				  const ocsd_trc_index_t indx)
{
	struct cs_etm_packet_queue *packet_queue;
	u64 converted_timestamp;
	u64 estimated_first_ts;

	/* First get the packet queue for this traceID */
	packet_queue = cs_etm__etmq_get_packet_queue(etmq, trace_chan_id);
	if (!packet_queue)
		return OCSD_RESP_FATAL_SYS_ERR;

	/*
	 * Coresight timestamps are raw timer values which need to be scaled to ns. Assume
	 * 0 is a bad value so don't try to convert it.
	 */
	converted_timestamp = elem->timestamp ?
				cs_etm__convert_sample_time(etmq, elem->timestamp) : 0;

	/*
	 * We've seen a timestamp packet before - simply record the new value.
	 * Function do_soft_timestamp() will report the value to the front end,
	 * hence asking the decoder to keep decoding rather than stopping.
	 */
	if (packet_queue->next_cs_timestamp) {
		/*
		 * What was next is now where new ranges start from, overwriting
		 * any previous estimate in cs_timestamp
		 */
		packet_queue->cs_timestamp = packet_queue->next_cs_timestamp;
		packet_queue->next_cs_timestamp = converted_timestamp;
		return OCSD_RESP_CONT;
	}

	if (!converted_timestamp) {
		/*
		 * Zero timestamps can be seen due to misconfiguration or hardware bugs.
		 * Warn once, and don't try to subtract instr_count as it would result in an
		 * underflow.
		 */
		packet_queue->cs_timestamp = 0;
		if (!cs_etm__etmq_is_timeless(etmq))
			pr_warning_once("Zero Coresight timestamp found at Idx:%" OCSD_TRC_IDX_STR
					". Decoding may be improved by prepending 'Z' to your current --itrace arguments.\n",
					indx);

	} else if (packet_queue->instr_count / INSTR_PER_NS > converted_timestamp) {
		/*
		 * Sanity check that the elem->timestamp - packet_queue->instr_count would not
		 * result in an underflow. Warn and clamp at 0 if it would.
		 */
		packet_queue->cs_timestamp = 0;
		pr_err("Timestamp calculation underflow at Idx:%" OCSD_TRC_IDX_STR "\n", indx);
	} else {
		/*
		 * This is the first timestamp we've seen since the beginning of traces
		 * or a discontinuity.  Since timestamps packets are generated *after*
		 * range packets have been generated, we need to estimate the time at
		 * which instructions started by subtracting the number of instructions
		 * executed to the timestamp. Don't estimate earlier than the last used
		 * timestamp though.
		 */
		estimated_first_ts = converted_timestamp -
					(packet_queue->instr_count / INSTR_PER_NS);
		packet_queue->cs_timestamp = max(packet_queue->cs_timestamp, estimated_first_ts);
	}
	packet_queue->next_cs_timestamp = converted_timestamp;
	packet_queue->instr_count = 0;

	/* Tell the front end which traceid_queue needs attention */
	cs_etm__etmq_set_traceid_queue_timestamp(etmq, trace_chan_id);

	/* Halt processing until we are being told to proceed */
	return OCSD_RESP_WAIT;
}

static void
cs_etm_decoder__reset_timestamp(struct cs_etm_packet_queue *packet_queue)
{
	packet_queue->next_cs_timestamp = 0;
	packet_queue->instr_count = 0;
}

static ocsd_datapath_resp_t
cs_etm_decoder__buffer_packet(struct cs_etm_packet_queue *packet_queue,
			      const u8 trace_chan_id,
			      enum cs_etm_sample_type sample_type)
{
	u32 et = 0;
	int cpu;

	if (packet_queue->packet_count >= CS_ETM_PACKET_MAX_BUFFER - 1)
		return OCSD_RESP_FATAL_SYS_ERR;

	if (cs_etm__get_cpu(trace_chan_id, &cpu) < 0)
		return OCSD_RESP_FATAL_SYS_ERR;

	et = packet_queue->tail;
	et = (et + 1) & (CS_ETM_PACKET_MAX_BUFFER - 1);
	packet_queue->tail = et;
	packet_queue->packet_count++;

	packet_queue->packet_buffer[et].sample_type = sample_type;
	packet_queue->packet_buffer[et].isa = CS_ETM_ISA_UNKNOWN;
	packet_queue->packet_buffer[et].cpu = cpu;
	packet_queue->packet_buffer[et].start_addr = CS_ETM_INVAL_ADDR;
	packet_queue->packet_buffer[et].end_addr = CS_ETM_INVAL_ADDR;
	packet_queue->packet_buffer[et].instr_count = 0;
	packet_queue->packet_buffer[et].last_instr_taken_branch = false;
	packet_queue->packet_buffer[et].last_instr_size = 0;
	packet_queue->packet_buffer[et].last_instr_type = 0;
	packet_queue->packet_buffer[et].last_instr_subtype = 0;
	packet_queue->packet_buffer[et].last_instr_cond = 0;
	packet_queue->packet_buffer[et].flags = 0;
	packet_queue->packet_buffer[et].exception_number = UINT32_MAX;
	packet_queue->packet_buffer[et].trace_chan_id = trace_chan_id;

	if (packet_queue->packet_count == CS_ETM_PACKET_MAX_BUFFER - 1)
		return OCSD_RESP_WAIT;

	return OCSD_RESP_CONT;
}

static ocsd_datapath_resp_t
cs_etm_decoder__buffer_range(struct cs_etm_queue *etmq,
			     struct cs_etm_packet_queue *packet_queue,
			     const ocsd_generic_trace_elem *elem,
			     const uint8_t trace_chan_id)
{
	int ret = 0;
	struct cs_etm_packet *packet;

	ret = cs_etm_decoder__buffer_packet(packet_queue, trace_chan_id,
					    CS_ETM_RANGE);
	if (ret != OCSD_RESP_CONT && ret != OCSD_RESP_WAIT)
		return ret;

	packet = &packet_queue->packet_buffer[packet_queue->tail];

	switch (elem->isa) {
	case ocsd_isa_aarch64:
		packet->isa = CS_ETM_ISA_A64;
		break;
	case ocsd_isa_arm:
		packet->isa = CS_ETM_ISA_A32;
		break;
	case ocsd_isa_thumb2:
		packet->isa = CS_ETM_ISA_T32;
		break;
	case ocsd_isa_tee:
	case ocsd_isa_jazelle:
	case ocsd_isa_custom:
	case ocsd_isa_unknown:
	default:
		packet->isa = CS_ETM_ISA_UNKNOWN;
	}

	packet->start_addr = elem->st_addr;
	packet->end_addr = elem->en_addr;
	packet->instr_count = elem->num_instr_range;
	packet->last_instr_type = elem->last_i_type;
	packet->last_instr_subtype = elem->last_i_subtype;
	packet->last_instr_cond = elem->last_instr_cond;

	if (elem->last_i_type == OCSD_INSTR_BR || elem->last_i_type == OCSD_INSTR_BR_INDIRECT)
		packet->last_instr_taken_branch = elem->last_instr_exec;
	else
		packet->last_instr_taken_branch = false;

	packet->last_instr_size = elem->last_instr_sz;

	/* per-thread scenario, no need to generate a timestamp */
	if (cs_etm__etmq_is_timeless(etmq))
		goto out;

	/*
	 * The packet queue is full and we haven't seen a timestamp (had we
	 * seen one the packet queue wouldn't be full).  Let the front end
	 * deal with it.
	 */
	if (ret == OCSD_RESP_WAIT)
		goto out;

	packet_queue->instr_count += elem->num_instr_range;
	/* Tell the front end we have a new timestamp to process */
	ret = cs_etm_decoder__do_soft_timestamp(etmq, packet_queue,
						trace_chan_id);
out:
	return ret;
}

static ocsd_datapath_resp_t
cs_etm_decoder__buffer_discontinuity(struct cs_etm_packet_queue *queue,
				     const uint8_t trace_chan_id)
{
	/*
	 * Something happened and who knows when we'll get new traces so
	 * reset time statistics.
	 */
	cs_etm_decoder__reset_timestamp(queue);
	return cs_etm_decoder__buffer_packet(queue, trace_chan_id,
					     CS_ETM_DISCONTINUITY);
}

static ocsd_datapath_resp_t
cs_etm_decoder__buffer_exception(struct cs_etm_packet_queue *queue,
				 const ocsd_generic_trace_elem *elem,
				 const uint8_t trace_chan_id)
{	int ret = 0;
	struct cs_etm_packet *packet;

	ret = cs_etm_decoder__buffer_packet(queue, trace_chan_id,
					    CS_ETM_EXCEPTION);
	if (ret != OCSD_RESP_CONT && ret != OCSD_RESP_WAIT)
		return ret;

	packet = &queue->packet_buffer[queue->tail];
	packet->exception_number = elem->exception_number;

	return ret;
}

static ocsd_datapath_resp_t
cs_etm_decoder__buffer_exception_ret(struct cs_etm_packet_queue *queue,
				     const uint8_t trace_chan_id)
{
	return cs_etm_decoder__buffer_packet(queue, trace_chan_id,
					     CS_ETM_EXCEPTION_RET);
}

static ocsd_datapath_resp_t
cs_etm_decoder__set_tid(struct cs_etm_queue *etmq,
			struct cs_etm_packet_queue *packet_queue,
			const ocsd_generic_trace_elem *elem,
			const uint8_t trace_chan_id)
{
	pid_t tid = -1;

	/*
	 * Process the PE_CONTEXT packets if we have a valid contextID or VMID.
	 * If the kernel is running at EL2, the PID is traced in CONTEXTIDR_EL2
	 * as VMID, Bit ETM_OPT_CTXTID2 is set in this case.
	 */
	switch (cs_etm__get_pid_fmt(etmq)) {
	case CS_ETM_PIDFMT_CTXTID:
		if (elem->context.ctxt_id_valid)
			tid = elem->context.context_id;
		break;
	case CS_ETM_PIDFMT_CTXTID2:
		if (elem->context.vmid_valid)
			tid = elem->context.vmid;
		break;
	case CS_ETM_PIDFMT_NONE:
	default:
		break;
	}

	if (cs_etm__etmq_set_tid_el(etmq, tid, trace_chan_id,
				    elem->context.exception_level))
		return OCSD_RESP_FATAL_SYS_ERR;

	if (tid == -1)
		return OCSD_RESP_CONT;

	/*
	 * A timestamp is generated after a PE_CONTEXT element so make sure
	 * to rely on that coming one.
	 */
	cs_etm_decoder__reset_timestamp(packet_queue);

	return OCSD_RESP_CONT;
}

static ocsd_datapath_resp_t cs_etm_decoder__gen_trace_elem_printer(
				const void *context,
				const ocsd_trc_index_t indx,
				const u8 trace_chan_id __maybe_unused,
				const ocsd_generic_trace_elem *elem)
{
	ocsd_datapath_resp_t resp = OCSD_RESP_CONT;
	struct cs_etm_decoder *decoder = (struct cs_etm_decoder *) context;
	struct cs_etm_queue *etmq = decoder->data;
	struct cs_etm_packet_queue *packet_queue;

	/* First get the packet queue for this traceID */
	packet_queue = cs_etm__etmq_get_packet_queue(etmq, trace_chan_id);
	if (!packet_queue)
		return OCSD_RESP_FATAL_SYS_ERR;

	switch (elem->elem_type) {
	case OCSD_GEN_TRC_ELEM_UNKNOWN:
		break;
	case OCSD_GEN_TRC_ELEM_EO_TRACE:
	case OCSD_GEN_TRC_ELEM_NO_SYNC:
	case OCSD_GEN_TRC_ELEM_TRACE_ON:
		resp = cs_etm_decoder__buffer_discontinuity(packet_queue,
							    trace_chan_id);
		break;
	case OCSD_GEN_TRC_ELEM_INSTR_RANGE:
		resp = cs_etm_decoder__buffer_range(etmq, packet_queue, elem,
						    trace_chan_id);
		break;
	case OCSD_GEN_TRC_ELEM_EXCEPTION:
		resp = cs_etm_decoder__buffer_exception(packet_queue, elem,
							trace_chan_id);
		break;
	case OCSD_GEN_TRC_ELEM_EXCEPTION_RET:
		resp = cs_etm_decoder__buffer_exception_ret(packet_queue,
							    trace_chan_id);
		break;
	case OCSD_GEN_TRC_ELEM_TIMESTAMP:
		resp = cs_etm_decoder__do_hard_timestamp(etmq, elem,
							 trace_chan_id,
							 indx);
		break;
	case OCSD_GEN_TRC_ELEM_PE_CONTEXT:
		resp = cs_etm_decoder__set_tid(etmq, packet_queue,
					       elem, trace_chan_id);
		break;
	/* Unused packet types */
	case OCSD_GEN_TRC_ELEM_I_RANGE_NOPATH:
	case OCSD_GEN_TRC_ELEM_ADDR_NACC:
	case OCSD_GEN_TRC_ELEM_CYCLE_COUNT:
	case OCSD_GEN_TRC_ELEM_ADDR_UNKNOWN:
	case OCSD_GEN_TRC_ELEM_EVENT:
	case OCSD_GEN_TRC_ELEM_SWTRACE:
	case OCSD_GEN_TRC_ELEM_CUSTOM:
	case OCSD_GEN_TRC_ELEM_SYNC_MARKER:
	case OCSD_GEN_TRC_ELEM_MEMTRANS:
#if (OCSD_VER_NUM >= 0x010400)
	case OCSD_GEN_TRC_ELEM_INSTRUMENTATION:
#endif
	default:
		break;
	}

	return resp;
}

static int
cs_etm_decoder__create_etm_decoder(struct cs_etm_decoder_params *d_params,
				   struct cs_etm_trace_params *t_params,
				   struct cs_etm_decoder *decoder)
{
	ocsd_etmv3_cfg config_etmv3;
	ocsd_etmv4_cfg trace_config_etmv4;
	ocsd_ete_cfg trace_config_ete;
	void *trace_config;
	u8 csid;

	switch (t_params->protocol) {
	case CS_ETM_PROTO_ETMV3:
	case CS_ETM_PROTO_PTM:
		csid = (t_params->etmv3.reg_idr & CORESIGHT_TRACE_ID_VAL_MASK);
		cs_etm_decoder__gen_etmv3_config(t_params, &config_etmv3);
		decoder->decoder_name = (t_params->protocol == CS_ETM_PROTO_ETMV3) ?
							OCSD_BUILTIN_DCD_ETMV3 :
							OCSD_BUILTIN_DCD_PTM;
		trace_config = &config_etmv3;
		break;
	case CS_ETM_PROTO_ETMV4i:
		csid = (t_params->etmv4.reg_traceidr & CORESIGHT_TRACE_ID_VAL_MASK);
		cs_etm_decoder__gen_etmv4_config(t_params, &trace_config_etmv4);
		decoder->decoder_name = OCSD_BUILTIN_DCD_ETMV4I;
		trace_config = &trace_config_etmv4;
		break;
	case CS_ETM_PROTO_ETE:
		csid = (t_params->ete.reg_traceidr & CORESIGHT_TRACE_ID_VAL_MASK);
		cs_etm_decoder__gen_ete_config(t_params, &trace_config_ete);
		decoder->decoder_name = OCSD_BUILTIN_DCD_ETE;
		trace_config = &trace_config_ete;
		break;
	default:
		return -1;
	}

	/* if the CPU has no trace ID associated, no decoder needed */
	if (csid == CORESIGHT_TRACE_ID_UNUSED_VAL)
		return 0;

	if (d_params->operation == CS_ETM_OPERATION_DECODE) {
		if (ocsd_dt_create_decoder(decoder->dcd_tree,
					   decoder->decoder_name,
					   OCSD_CREATE_FLG_FULL_DECODER,
					   trace_config, &csid))
			return -1;

		if (ocsd_dt_set_gen_elem_outfn(decoder->dcd_tree,
					       cs_etm_decoder__gen_trace_elem_printer,
					       decoder))
			return -1;

		return 0;
	} else if (d_params->operation == CS_ETM_OPERATION_PRINT) {
		if (ocsd_dt_create_decoder(decoder->dcd_tree, decoder->decoder_name,
					   OCSD_CREATE_FLG_PACKET_PROC,
					   trace_config, &csid))
			return -1;

		if (ocsd_dt_set_pkt_protocol_printer(decoder->dcd_tree, csid, 0))
			return -1;

		return 0;
	}

	return -1;
}

struct cs_etm_decoder *
cs_etm_decoder__new(int decoders, struct cs_etm_decoder_params *d_params,
		    struct cs_etm_trace_params t_params[])
{
	struct cs_etm_decoder *decoder;
	ocsd_dcd_tree_src_t format;
	u32 flags;
	int i, ret;

	if ((!t_params) || (!d_params))
		return NULL;

	decoder = zalloc(sizeof(*decoder));

	if (!decoder)
		return NULL;

	decoder->data = d_params->data;
	decoder->prev_return = OCSD_RESP_CONT;
	format = (d_params->formatted ? OCSD_TRC_SRC_FRAME_FORMATTED :
					 OCSD_TRC_SRC_SINGLE);
	flags = 0;
	flags |= (d_params->fsyncs ? OCSD_DFRMTR_HAS_FSYNCS : 0);
	flags |= (d_params->hsyncs ? OCSD_DFRMTR_HAS_HSYNCS : 0);
	flags |= (d_params->frame_aligned ? OCSD_DFRMTR_FRAME_MEM_ALIGN : 0);

	/*
	 * Drivers may add barrier frames when used with perf, set up to
	 * handle this. Barriers const of FSYNC packet repeated 4 times.
	 */
	flags |= OCSD_DFRMTR_RESET_ON_4X_FSYNC;

	/* Create decode tree for the data source */
	decoder->dcd_tree = ocsd_create_dcd_tree(format, flags);

	if (decoder->dcd_tree == 0)
		goto err_free_decoder;

	/* init library print logging support */
	ret = cs_etm_decoder__init_def_logger_printing(d_params, decoder);
	if (ret != 0)
		goto err_free_decoder;

	/* init raw frame logging if required */
	cs_etm_decoder__init_raw_frame_logging(d_params, decoder);

	for (i = 0; i < decoders; i++) {
		ret = cs_etm_decoder__create_etm_decoder(d_params,
							 &t_params[i],
							 decoder);
		if (ret != 0)
			goto err_free_decoder;
	}

	return decoder;

err_free_decoder:
	cs_etm_decoder__free(decoder);
	return NULL;
}

int cs_etm_decoder__process_data_block(struct cs_etm_decoder *decoder,
				       u64 indx, const u8 *buf,
				       size_t len, size_t *consumed)
{
	int ret = 0;
	ocsd_datapath_resp_t cur = OCSD_RESP_CONT;
	ocsd_datapath_resp_t prev_return = decoder->prev_return;
	size_t processed = 0;
	u32 count;

	while (processed < len) {
		if (OCSD_DATA_RESP_IS_WAIT(prev_return)) {
			cur = ocsd_dt_process_data(decoder->dcd_tree,
						   OCSD_OP_FLUSH,
						   0,
						   0,
						   NULL,
						   NULL);
		} else if (OCSD_DATA_RESP_IS_CONT(prev_return)) {
			cur = ocsd_dt_process_data(decoder->dcd_tree,
						   OCSD_OP_DATA,
						   indx + processed,
						   len - processed,
						   &buf[processed],
						   &count);
			processed += count;
		} else {
			ret = -EINVAL;
			break;
		}

		/*
		 * Return to the input code if the packet buffer is full.
		 * Flushing will get done once the packet buffer has been
		 * processed.
		 */
		if (OCSD_DATA_RESP_IS_WAIT(cur))
			break;

		prev_return = cur;
	}

	decoder->prev_return = cur;
	*consumed = processed;

	return ret;
}

void cs_etm_decoder__free(struct cs_etm_decoder *decoder)
{
	if (!decoder)
		return;

	ocsd_destroy_dcd_tree(decoder->dcd_tree);
	decoder->dcd_tree = NULL;
	free(decoder);
}

const char *cs_etm_decoder__get_name(struct cs_etm_decoder *decoder)
{
	return decoder->decoder_name;
}