요약·해설과 원문, 전문 번역을 서로 분리했습니다. API 이름, symbol, source path는 원문 표기를 사용합니다.
1. 요약·해설
원문의 핵심 논리와 kernel programming 관점의 보충 설명입니다. 아래의 전문 번역과는 별도로 작성했습니다.
Trace events, exception levels와 address comparators
sysfs-bus-coresight-devices-etm4x:94-182PE selection, event banks, timestamps·sync·cycle threshold·branch broadcast·instruction filtering을 제어하고 addr_idx로 single 또는 range comparator를 program합니다.
Sequencer, counter, resource, context와 VMID selectors
sysfs-bus-coresight-devices-etm4x:183-284seq_idx·cntr_idx·res_idx·ctxid_idx·vmid_idx가 각 hardware unit을 선택하고 state/event, count, resource, context ID와 VMID values·masks를 read/write합니다.
Exception-level, PE comparator와 single-shot extensions
sysfs-bus-coresight-devices-etm4x:285-337Secure/non-secure exception matching, PE comparator start/stop, selected address view와 indexed single-shot control·status를 제공하고 label이 hardware context를 표시합니다.
ETM4x management register views
sysfs-bus-coresight-devices-etm4x:338-435OS·software locks, power, authentication, device architecture/type/IDs, software trace configuration과 trace ID registers를 exact offsets에서 읽습니다.
TRCIDR capabilities와 timestamp source
sysfs-bus-coresight-devices-etm4x:436-532TRCIDR files는 trace capability, value widths, resources, speculation과 P0/P1 keys를 보고하며 ts_source는 FEAT_TRF timestamp source 또는 unknown -1을 제공합니다.
2. 영어 원문 전체
번역 기준이 된 Linux v6.18.37 원문입니다. 줄 번호는 이 버전의 파일 좌표입니다.
원문 전체 펼치기
1
What: /sys/bus/coresight/devices/etm<N>/enable_source
2
Date: April 2015
3
KernelVersion: 4.01
4
Contact: Mathieu Poirier <[email protected]>
5
Description: (RW) Enable/disable tracing on this specific trace entiry.
6
Enabling a source implies the source has been configured
7
properly and a sink has been identidifed for it. The path
8
of coresight components linking the source to the sink is
9
configured and managed automatically by the coresight framework.
11
What: /sys/bus/coresight/devices/etm<N>/cpu
12
Date: April 2015
13
KernelVersion: 4.01
14
Contact: Mathieu Poirier <[email protected]>
15
Description: (Read) The CPU this tracing entity is associated with.
17
What: /sys/bus/coresight/devices/etm<N>/nr_pe_cmp
18
Date: April 2015
19
KernelVersion: 4.01
20
Contact: Mathieu Poirier <[email protected]>
21
Description: (Read) Indicates the number of PE comparator inputs that are
22
available for tracing.
24
What: /sys/bus/coresight/devices/etm<N>/nr_addr_cmp
25
Date: April 2015
26
KernelVersion: 4.01
27
Contact: Mathieu Poirier <[email protected]>
28
Description: (Read) Indicates the number of address comparator pairs that are
29
available for tracing.
31
What: /sys/bus/coresight/devices/etm<N>/nr_cntr
32
Date: April 2015
33
KernelVersion: 4.01
34
Contact: Mathieu Poirier <[email protected]>
35
Description: (Read) Indicates the number of counters that are available for
36
tracing.
38
What: /sys/bus/coresight/devices/etm<N>/nr_ext_inp
39
Date: April 2015
40
KernelVersion: 4.01
41
Contact: Mathieu Poirier <[email protected]>
42
Description: (Read) Indicates how many external inputs are implemented.
44
What: /sys/bus/coresight/devices/etm<N>/numcidc
45
Date: April 2015
46
KernelVersion: 4.01
47
Contact: Mathieu Poirier <[email protected]>
48
Description: (Read) Indicates the number of Context ID comparators that are
49
available for tracing.
51
What: /sys/bus/coresight/devices/etm<N>/numvmidc
52
Date: April 2015
53
KernelVersion: 4.01
54
Contact: Mathieu Poirier <[email protected]>
55
Description: (Read) Indicates the number of VMID comparators that are available
56
for tracing.
58
What: /sys/bus/coresight/devices/etm<N>/nrseqstate
59
Date: April 2015
60
KernelVersion: 4.01
61
Contact: Mathieu Poirier <[email protected]>
62
Description: (Read) Indicates the number of sequencer states that are
63
implemented.
65
What: /sys/bus/coresight/devices/etm<N>/nr_resource
66
Date: April 2015
67
KernelVersion: 4.01
68
Contact: Mathieu Poirier <[email protected]>
69
Description: (Read) Indicates the number of resource selection pairs that are
70
available for tracing.
72
What: /sys/bus/coresight/devices/etm<N>/nr_ss_cmp
73
Date: April 2015
74
KernelVersion: 4.01
75
Contact: Mathieu Poirier <[email protected]>
76
Description: (Read) Indicates the number of single-shot comparator controls that
77
are available for tracing.
79
What: /sys/bus/coresight/devices/etm<N>/reset
80
Date: April 2015
81
KernelVersion: 4.01
82
Contact: Mathieu Poirier <[email protected]>
83
Description: (Write) Cancels all configuration on a trace unit and set it back
84
to its boot configuration.
86
What: /sys/bus/coresight/devices/etm<N>/mode
87
Date: April 2015
88
KernelVersion: 4.01
89
Contact: Mathieu Poirier <[email protected]>
90
Description: (RW) Controls various modes supported by this ETM, for example
91
P0 instruction tracing, branch broadcast, cycle counting and
92
context ID tracing.
94
What: /sys/bus/coresight/devices/etm<N>/pe
95
Date: April 2015
96
KernelVersion: 4.01
97
Contact: Mathieu Poirier <[email protected]>
98
Description: (RW) Controls which PE to trace.
100
What: /sys/bus/coresight/devices/etm<N>/event
101
Date: April 2015
102
KernelVersion: 4.01
103
Contact: Mathieu Poirier <[email protected]>
104
Description: (RW) Controls the tracing of arbitrary events from bank 0 to 3.
106
What: /sys/bus/coresight/devices/etm<N>/event_instren
107
Date: April 2015
108
KernelVersion: 4.01
109
Contact: Mathieu Poirier <[email protected]>
110
Description: (RW) Controls the behavior of the events in bank 0 to 3.
112
What: /sys/bus/coresight/devices/etm<N>/event_ts
113
Date: April 2015
114
KernelVersion: 4.01
115
Contact: Mathieu Poirier <[email protected]>
116
Description: (RW) Controls the insertion of global timestamps in the trace
117
streams.
119
What: /sys/bus/coresight/devices/etm<N>/syncfreq
120
Date: April 2015
121
KernelVersion: 4.01
122
Contact: Mathieu Poirier <[email protected]>
123
Description: (RW) Controls how often trace synchronization requests occur.
125
What: /sys/bus/coresight/devices/etm<N>/cyc_threshold
126
Date: April 2015
127
KernelVersion: 4.01
128
Contact: Mathieu Poirier <[email protected]>
129
Description: (RW) Sets the threshold value for cycle counting.
131
What: /sys/bus/coresight/devices/etm<N>/bb_ctrl
132
Date: April 2015
133
KernelVersion: 4.01
134
Contact: Mathieu Poirier <[email protected]>
135
Description: (RW) Controls which regions in the memory map are enabled to
136
use branch broadcasting.
138
What: /sys/bus/coresight/devices/etm<N>/event_vinst
139
Date: April 2015
140
KernelVersion: 4.01
141
Contact: Mathieu Poirier <[email protected]>
142
Description: (RW) Controls instruction trace filtering.
144
What: /sys/bus/coresight/devices/etm<N>/s_exlevel_vinst
145
Date: April 2015
146
KernelVersion: 4.01
147
Contact: Mathieu Poirier <[email protected]>
148
Description: (RW) In Secure state, each bit controls whether instruction
149
tracing is enabled for the corresponding exception level.
151
What: /sys/bus/coresight/devices/etm<N>/ns_exlevel_vinst
152
Date: April 2015
153
KernelVersion: 4.01
154
Contact: Mathieu Poirier <[email protected]>
155
Description: (RW) In non-secure state, each bit controls whether instruction
156
tracing is enabled for the corresponding exception level.
158
What: /sys/bus/coresight/devices/etm<N>/addr_idx
159
Date: April 2015
160
KernelVersion: 4.01
161
Contact: Mathieu Poirier <[email protected]>
162
Description: (RW) Select which address comparator or pair (of comparators) to
163
work with.
165
What: /sys/bus/coresight/devices/etm<N>/addr_instdatatype
166
Date: April 2015
167
KernelVersion: 4.01
168
Contact: Mathieu Poirier <[email protected]>
169
Description: (RW) Controls what type of comparison the trace unit performs.
171
What: /sys/bus/coresight/devices/etm<N>/addr_single
172
Date: April 2015
173
KernelVersion: 4.01
174
Contact: Mathieu Poirier <[email protected]>
175
Description: (RW) Used to setup single address comparator values.
177
What: /sys/bus/coresight/devices/etm<N>/addr_range
178
Date: April 2015
179
KernelVersion: 4.01
180
Contact: Mathieu Poirier <[email protected]>
181
Description: (RW) Used to setup address range comparator values.
183
What: /sys/bus/coresight/devices/etm<N>/seq_idx
184
Date: April 2015
185
KernelVersion: 4.01
186
Contact: Mathieu Poirier <[email protected]>
187
Description: (RW) Select which sequensor.
189
What: /sys/bus/coresight/devices/etm<N>/seq_state
190
Date: April 2015
191
KernelVersion: 4.01
192
Contact: Mathieu Poirier <[email protected]>
193
Description: (RW) Use this to set, or read, the sequencer state.
195
What: /sys/bus/coresight/devices/etm<N>/seq_event
196
Date: April 2015
197
KernelVersion: 4.01
198
Contact: Mathieu Poirier <[email protected]>
199
Description: (RW) Moves the sequencer state to a specific state.
201
What: /sys/bus/coresight/devices/etm<N>/seq_reset_event
202
Date: April 2015
203
KernelVersion: 4.01
204
Contact: Mathieu Poirier <[email protected]>
205
Description: (RW) Moves the sequencer to state 0 when a programmed event
206
occurs.
208
What: /sys/bus/coresight/devices/etm<N>/cntr_idx
209
Date: April 2015
210
KernelVersion: 4.01
211
Contact: Mathieu Poirier <[email protected]>
212
Description: (RW) Select which counter unit to work with.
214
What: /sys/bus/coresight/devices/etm<N>/cntrldvr
215
Date: April 2015
216
KernelVersion: 4.01
217
Contact: Mathieu Poirier <[email protected]>
218
Description: (RW) This sets or returns the reload count value of the
219
specific counter.
221
What: /sys/bus/coresight/devices/etm<N>/cntr_val
222
Date: April 2015
223
KernelVersion: 4.01
224
Contact: Mathieu Poirier <[email protected]>
225
Description: (RW) This sets or returns the current count value of the
226
specific counter.
228
What: /sys/bus/coresight/devices/etm<N>/cntr_ctrl
229
Date: April 2015
230
KernelVersion: 4.01
231
Contact: Mathieu Poirier <[email protected]>
232
Description: (RW) Controls the operation of the selected counter.
234
What: /sys/bus/coresight/devices/etm<N>/res_idx
235
Date: April 2015
236
KernelVersion: 4.01
237
Contact: Mathieu Poirier <[email protected]>
238
Description: (RW) Select which resource selection unit to work with.
240
What: /sys/bus/coresight/devices/etm<N>/res_ctrl
241
Date: April 2015
242
KernelVersion: 4.01
243
Contact: Mathieu Poirier <[email protected]>
244
Description: (RW) Controls the selection of the resources in the trace unit.
246
What: /sys/bus/coresight/devices/etm<N>/ctxid_idx
247
Date: April 2015
248
KernelVersion: 4.01
249
Contact: Mathieu Poirier <[email protected]>
250
Description: (RW) Select which context ID comparator to work with.
252
What: /sys/bus/coresight/devices/etm<N>/ctxid_pid
253
Date: April 2015
254
KernelVersion: 4.01
255
Contact: Mathieu Poirier <[email protected]>
256
Description: (RW) Get/Set the context ID comparator value to trigger on.
258
What: /sys/bus/coresight/devices/etm<N>/ctxid_masks
259
Date: April 2015
260
KernelVersion: 4.01
261
Contact: Mathieu Poirier <[email protected]>
262
Description: (RW) Mask for all 8 context ID comparator value
263
registers (if implemented).
265
What: /sys/bus/coresight/devices/etm<N>/vmid_idx
266
Date: April 2015
267
KernelVersion: 4.01
268
Contact: Mathieu Poirier <[email protected]>
269
Description: (RW) Select which virtual machine ID comparator to work with.
271
What: /sys/bus/coresight/devices/etm<N>/vmid_val
272
Date: April 2015
273
KernelVersion: 4.01
274
Contact: Mathieu Poirier <[email protected]>
275
Description: (RW) Get/Set the virtual machine ID comparator value to
276
trigger on.
278
What: /sys/bus/coresight/devices/etm<N>/vmid_masks
279
Date: April 2015
280
KernelVersion: 4.01
281
Contact: Mathieu Poirier <[email protected]>
282
Description: (RW) Mask for all 8 virtual machine ID comparator value
283
registers (if implemented).
285
What: /sys/bus/coresight/devices/etm<N>/addr_exlevel_s_ns
286
Date: December 2019
287
KernelVersion: 5.5
288
Contact: Mathieu Poirier <[email protected]>
289
Description: (RW) Set the Exception Level matching bits for secure and
290
non-secure exception levels.
292
What: /sys/bus/coresight/devices/etm<N>/vinst_pe_cmp_start_stop
293
Date: December 2019
294
KernelVersion: 5.5
295
Contact: Mathieu Poirier <[email protected]>
296
Description: (RW) Access the start stop control register for PE input
297
comparators.
299
What: /sys/bus/coresight/devices/etm<N>/addr_cmp_view
300
Date: December 2019
301
KernelVersion: 5.5
302
Contact: Mathieu Poirier <[email protected]>
303
Description: (Read) Print the current settings for the selected address
304
comparator.
306
What: /sys/bus/coresight/devices/etm<N>/sshot_idx
307
Date: December 2019
308
KernelVersion: 5.5
309
Contact: Mathieu Poirier <[email protected]>
310
Description: (RW) Select the single shot control register to access.
312
What: /sys/bus/coresight/devices/etm<N>/sshot_ctrl
313
Date: December 2019
314
KernelVersion: 5.5
315
Contact: Mathieu Poirier <[email protected]>
316
Description: (RW) Access the selected single shot control register.
318
What: /sys/bus/coresight/devices/etm<N>/sshot_status
319
Date: December 2019
320
KernelVersion: 5.5
321
Contact: Mathieu Poirier <[email protected]>
322
Description: (Read) Print the current value of the selected single shot
323
status register.
325
What: /sys/bus/coresight/devices/etm<N>/sshot_pe_ctrl
326
Date: December 2019
327
KernelVersion: 5.5
328
Contact: Mathieu Poirier <[email protected]>
329
Description: (RW) Access the selected single show PE comparator control
330
register.
332
What: /sys/bus/coresight/devices/etm<N>/label
333
Date: Aug 2025
334
KernelVersion 6.18
335
Contact: Mao Jinlong <[email protected]>
336
Description: (Read) Show hardware context information of device.
338
What: /sys/bus/coresight/devices/etm<N>/mgmt/trcoslsr
339
Date: April 2015
340
KernelVersion: 4.01
341
Contact: Mathieu Poirier <[email protected]>
342
Description: (Read) Print the content of the OS Lock Status Register (0x304).
343
The value it taken directly from the HW.
345
What: /sys/bus/coresight/devices/etm<N>/mgmt/trcpdcr
346
Date: April 2015
347
KernelVersion: 4.01
348
Contact: Mathieu Poirier <[email protected]>
349
Description: (Read) Print the content of the Power Down Control Register
350
(0x310). The value is taken directly from the HW.
352
What: /sys/bus/coresight/devices/etm<N>/mgmt/trcpdsr
353
Date: April 2015
354
KernelVersion: 4.01
355
Contact: Mathieu Poirier <[email protected]>
356
Description: (Read) Print the content of the Power Down Status Register
357
(0x314). The value is taken directly from the HW.
359
What: /sys/bus/coresight/devices/etm<N>/mgmt/trclsr
360
Date: April 2015
361
KernelVersion: 4.01
362
Contact: Mathieu Poirier <[email protected]>
363
Description: (Read) Print the content of the SW Lock Status Register
364
(0xFB4). The value is taken directly from the HW.
366
What: /sys/bus/coresight/devices/etm<N>/mgmt/trcauthstatus
367
Date: April 2015
368
KernelVersion: 4.01
369
Contact: Mathieu Poirier <[email protected]>
370
Description: (Read) Print the content of the Authentication Status Register
371
(0xFB8). The value is taken directly from the HW.
373
What: /sys/bus/coresight/devices/etm<N>/mgmt/trcdevid
374
Date: April 2015
375
KernelVersion: 4.01
376
Contact: Mathieu Poirier <[email protected]>
377
Description: (Read) Print the content of the Device ID Register
378
(0xFC8). The value is taken directly from the HW.
380
What: /sys/bus/coresight/devices/etm<N>/mgmt/trcdevarch
381
Date: January 2021
382
KernelVersion: 5.12
383
Contact: Mathieu Poirier <[email protected]>
384
Description: (Read) Print the content of the Device Architecture Register
385
(offset 0xFBC). The value is taken directly read
386
from the HW.
388
What: /sys/bus/coresight/devices/etm<N>/mgmt/trcdevtype
389
Date: April 2015
390
KernelVersion: 4.01
391
Contact: Mathieu Poirier <[email protected]>
392
Description: (Read) Print the content of the Device Type Register
393
(0xFCC). The value is taken directly from the HW.
395
What: /sys/bus/coresight/devices/etm<N>/mgmt/trcpidr0
396
Date: April 2015
397
KernelVersion: 4.01
398
Contact: Mathieu Poirier <[email protected]>
399
Description: (Read) Print the content of the Peripheral ID0 Register
400
(0xFE0). The value is taken directly from the HW.
402
What: /sys/bus/coresight/devices/etm<N>/mgmt/trcpidr1
403
Date: April 2015
404
KernelVersion: 4.01
405
Contact: Mathieu Poirier <[email protected]>
406
Description: (Read) Print the content of the Peripheral ID1 Register
407
(0xFE4). The value is taken directly from the HW.
409
What: /sys/bus/coresight/devices/etm<N>/mgmt/trcpidr2
410
Date: April 2015
411
KernelVersion: 4.01
412
Contact: Mathieu Poirier <[email protected]>
413
Description: (Read) Print the content of the Peripheral ID2 Register
414
(0xFE8). The value is taken directly from the HW.
416
What: /sys/bus/coresight/devices/etm<N>/mgmt/trcpidr3
417
Date: April 2015
418
KernelVersion: 4.01
419
Contact: Mathieu Poirier <[email protected]>
420
Description: (Read) Print the content of the Peripheral ID3 Register
421
(0xFEC). The value is taken directly from the HW.
423
What: /sys/bus/coresight/devices/etm<N>/mgmt/trcconfig
424
Date: February 2016
425
KernelVersion: 4.07
426
Contact: Mathieu Poirier <[email protected]>
427
Description: (Read) Print the content of the trace configuration register
428
(0x010) as currently set by SW.
430
What: /sys/bus/coresight/devices/etm<N>/mgmt/trctraceid
431
Date: February 2016
432
KernelVersion: 4.07
433
Contact: Mathieu Poirier <[email protected]>
434
Description: (Read) Print the content of the trace ID register (0x040).
436
What: /sys/bus/coresight/devices/etm<N>/trcidr/trcidr0
437
Date: April 2015
438
KernelVersion: 4.01
439
Contact: Mathieu Poirier <[email protected]>
440
Description: (Read) Returns the tracing capabilities of the trace unit (0x1E0).
441
The value is taken directly from the HW.
443
What: /sys/bus/coresight/devices/etm<N>/trcidr/trcidr1
444
Date: April 2015
445
KernelVersion: 4.01
446
Contact: Mathieu Poirier <[email protected]>
447
Description: (Read) Returns the tracing capabilities of the trace unit (0x1E4).
448
The value is taken directly from the HW.
450
What: /sys/bus/coresight/devices/etm<N>/trcidr/trcidr2
451
Date: April 2015
452
KernelVersion: 4.01
453
Contact: Mathieu Poirier <[email protected]>
454
Description: (Read) Returns the maximum size of the data value, data address,
455
VMID, context ID and instruction address in the trace unit
456
(0x1E8). The value is taken directly from the HW.
458
What: /sys/bus/coresight/devices/etm<N>/trcidr/trcidr3
459
Date: April 2015
460
KernelVersion: 4.01
461
Contact: Mathieu Poirier <[email protected]>
462
Description: (Read) Returns the value associated with various resources
463
available to the trace unit. See the Trace Macrocell
464
architecture specification for more details (0x1E8).
465
The value is taken directly from the HW.
467
What: /sys/bus/coresight/devices/etm<N>/trcidr/trcidr4
468
Date: April 2015
469
KernelVersion: 4.01
470
Contact: Mathieu Poirier <[email protected]>
471
Description: (Read) Returns how many resources the trace unit supports (0x1F0).
472
The value is taken directly from the HW.
474
What: /sys/bus/coresight/devices/etm<N>/trcidr/trcidr5
475
Date: April 2015
476
KernelVersion: 4.01
477
Contact: Mathieu Poirier <[email protected]>
478
Description: (Read) Returns how many resources the trace unit supports (0x1F4).
479
The value is taken directly from the HW.
481
What: /sys/bus/coresight/devices/etm<N>/trcidr/trcidr8
482
Date: April 2015
483
KernelVersion: 4.01
484
Contact: Mathieu Poirier <[email protected]>
485
Description: (Read) Returns the maximum speculation depth of the instruction
486
trace stream. (0x180). The value is taken directly from the HW.
488
What: /sys/bus/coresight/devices/etm<N>/trcidr/trcidr9
489
Date: April 2015
490
KernelVersion: 4.01
491
Contact: Mathieu Poirier <[email protected]>
492
Description: (Read) Returns the number of P0 right-hand keys that the trace unit
493
can use (0x184). The value is taken directly from the HW.
495
What: /sys/bus/coresight/devices/etm<N>/trcidr/trcidr10
496
Date: April 2015
497
KernelVersion: 4.01
498
Contact: Mathieu Poirier <[email protected]>
499
Description: (Read) Returns the number of P1 right-hand keys that the trace unit
500
can use (0x188). The value is taken directly from the HW.
502
What: /sys/bus/coresight/devices/etm<N>/trcidr/trcidr11
503
Date: April 2015
504
KernelVersion: 4.01
505
Contact: Mathieu Poirier <[email protected]>
506
Description: (Read) Returns the number of special P1 right-hand keys that the
507
trace unit can use (0x18C). The value is taken directly from
508
the HW.
510
What: /sys/bus/coresight/devices/etm<N>/trcidr/trcidr12
511
Date: April 2015
512
KernelVersion: 4.01
513
Contact: Mathieu Poirier <[email protected]>
514
Description: (Read) Returns the number of conditional P1 right-hand keys that
515
the trace unit can use (0x190). The value is taken directly
516
from the HW.
518
What: /sys/bus/coresight/devices/etm<N>/trcidr/trcidr13
519
Date: April 2015
520
KernelVersion: 4.01
521
Contact: Mathieu Poirier <[email protected]>
522
Description: (Read) Returns the number of special conditional P1 right-hand keys
523
that the trace unit can use (0x194). The value is taken
524
directly from the HW.
526
What: /sys/bus/coresight/devices/etm<N>/ts_source
527
Date: October 2022
528
KernelVersion: 6.1
529
Contact: Mathieu Poirier <[email protected]> or Suzuki K Poulose <[email protected]>
530
Description: (Read) When FEAT_TRF is implemented, value of TRFCR_ELx.TS used for
531
trace session. Otherwise -1 indicates an unknown time source. Check
532
trcidr0.tssize to see if a global timestamp is available.
3. 한국어 전문 번역
영어 원문의 문단 순서와 의미를 유지한 전체 번역입니다. 코드, 함수명, symbol과 URL은 원문 표기를 유지합니다.
ETM4x source control과 hardware capabilities
1-93| 공통 항목 | 내용 |
|---|---|
| Date | 2015년 4월 |
| KernelVersion | 4.01 |
| Contact | Mathieu Poirier <[email protected]> |
| 적용 범위 | 별도 metadata가 명시된 lines 285 이후 attributes를 제외한 lines 1-284 |
| What suffix | Access | 전문 번역 |
|---|---|---|
| enable_source | RW | 이 특정 trace entity의 tracing을 enable 또는 disable합니다. Source를 enable한다는 것은 source가 올바르게 configure되었고 sink가 identified되었음을 전제로 합니다. Source와 sink를 연결하는 CoreSight components path는 CoreSight framework가 자동으로 configure하고 manage합니다. |
| cpu | Read | 이 tracing entity와 연결된 CPU입니다. |
| nr_pe_cmp | Read | Tracing에 사용할 수 있는 PE comparator inputs 수를 나타냅니다. |
| nr_addr_cmp | Read | Tracing에 사용할 수 있는 address comparator pairs 수를 나타냅니다. |
| nr_cntr | Read | Tracing에 사용할 수 있는 counters 수를 나타냅니다. |
| nr_ext_inp | Read | 구현된 external inputs 수를 나타냅니다. |
| numcidc | Read | Tracing에 사용할 수 있는 Context ID comparators 수를 나타냅니다. |
| numvmidc | Read | Tracing에 사용할 수 있는 VMID comparators 수를 나타냅니다. |
| nrseqstate | Read | 구현된 sequencer states 수를 나타냅니다. |
| nr_resource | Read | Tracing에 사용할 수 있는 resource selection pairs 수를 나타냅니다. |
| nr_ss_cmp | Read | Tracing에 사용할 수 있는 single-shot comparator controls 수를 나타냅니다. |
| reset | Write | Trace unit의 모든 configuration을 cancel하고 boot configuration으로 되돌립니다. |
| mode | RW | P0 instruction tracing, branch broadcast, cycle counting과 context ID tracing 등 이 ETM이 지원하는 여러 mode를 제어합니다. |
모든 suffix는 /sys/bus/coresight/devices/etm<N>/ 아래의 file입니다.
Read comparator, counter and resource counts→Configure ETM4x source→Identify sink→Enable source→Framework manages trace path
Write reset→Cancel all configuration→Restore boot configuration
Hardware resource counts를 확인해 source를 configure하고 sink를 identify한 뒤 framework-managed path를 enable한다.
Trace event controls와 address comparisons
94-182| What suffix | Access | 전문 번역 |
|---|---|---|
| pe | RW | 어떤 PE를 trace할지 제어합니다. |
| event | RW | Bank 0부터 3까지의 arbitrary events tracing을 제어합니다. |
| event_instren | RW | Bank 0부터 3까지 events의 behavior를 제어합니다. |
| event_ts | RW | Trace streams에 global timestamp를 삽입하는 동작을 제어합니다. |
| syncfreq | RW | Trace synchronization request가 얼마나 자주 발생하는지 제어합니다. |
| cyc_threshold | RW | Cycle counting의 threshold value를 설정합니다. |
| bb_ctrl | RW | Memory map에서 branch broadcasting을 사용할 수 있는 regions를 제어합니다. |
| event_vinst | RW | Instruction trace filtering을 제어합니다. |
| s_exlevel_vinst | RW | Secure state에서 각 bit가 corresponding exception level의 instruction tracing enable 여부를 제어합니다. |
| ns_exlevel_vinst | RW | Non-secure state에서 각 bit가 corresponding exception level의 instruction tracing enable 여부를 제어합니다. |
| addr_idx | RW | 작업할 address comparator 또는 comparator pair를 선택합니다. |
| addr_instdatatype | RW | Trace unit이 수행하는 comparison type을 제어합니다. |
| addr_single | RW | Single address comparator values를 setup하는 데 사용합니다. |
| addr_range | RW | Address range comparator values를 setup하는 데 사용합니다. |
Select PE and trace modes→Configure event banks and timestamps→Apply secure and non-secure exception filters→Generate filtered trace
Write addr_idx→Select address comparator→Set comparison type→Program single or range value
Trace mode와 event filters를 설정하고 addr_idx로 selected comparator에 single 또는 range value를 적용한다.
Indexed sequencer, counters, resources, Context ID와 VMID
183-284| What suffix | Access | 전문 번역 |
|---|---|---|
| seq_idx | RW | 작업할 sequencer를 선택합니다. |
| seq_state | RW | Sequencer state를 설정하거나 읽습니다. |
| seq_event | RW | Sequencer state를 특정 state로 이동시킵니다. |
| seq_reset_event | RW | Programmed event가 발생하면 sequencer를 state 0으로 이동시킵니다. |
| cntr_idx | RW | 작업할 counter unit을 선택합니다. |
| cntrldvr | RW | 특정 counter의 reload count value를 설정하거나 반환합니다. |
| cntr_val | RW | 특정 counter의 current count value를 설정하거나 반환합니다. |
| cntr_ctrl | RW | Selected counter의 operation을 제어합니다. |
| res_idx | RW | 작업할 resource selection unit을 선택합니다. |
| res_ctrl | RW | Trace unit의 resource selection을 제어합니다. |
| ctxid_idx | RW | 작업할 context ID comparator를 선택합니다. |
| ctxid_pid | RW | Trigger할 context ID comparator value를 get 또는 set합니다. |
| ctxid_masks | RW | 구현된 경우 context ID comparator value registers 8개 모두에 적용하는 mask입니다. |
| vmid_idx | RW | 작업할 virtual machine ID comparator를 선택합니다. |
| vmid_val | RW | Trigger할 virtual machine ID comparator value를 get 또는 set합니다. |
| vmid_masks | RW | 구현된 경우 virtual machine ID comparator value registers 8개 모두에 적용하는 mask입니다. |
seq_idx→Selected sequencer→state, event and reset event
cntr_idx→Selected counter→reload, current value and control
res_idx→Selected resource unit→res_ctrl
ctxid_idx→Selected Context ID comparator→ctxid_pid
vmid_idx→Selected VMID comparator→vmid_val
ctxid_masks and vmid_masks→Masks for all eight comparator registers
각 selector가 target hardware unit을 고른 뒤 corresponding control/value file이 selected unit을 조작한다.
Exception matching, PE comparator와 single-shot controls
285-337| 공통 항목 | 내용 |
|---|---|
| Date | 2019년 12월 |
| KernelVersion | 5.5 |
| Contact | Mathieu Poirier <[email protected]> |
| 적용 범위 | lines 285-331의 7개 attributes |
| What suffix | Access | 전문 번역 |
|---|---|---|
| addr_exlevel_s_ns | RW | Secure와 non-secure exception levels의 Exception Level matching bits를 설정합니다. |
| vinst_pe_cmp_start_stop | RW | PE input comparators의 start/stop control register에 access합니다. |
| addr_cmp_view | Read | Selected address comparator의 current settings를 출력합니다. |
| sshot_idx | RW | Access할 single-shot control register를 선택합니다. |
| sshot_ctrl | RW | Selected single-shot control register에 access합니다. |
| sshot_status | Read | Selected single-shot status register의 current value를 출력합니다. |
| sshot_pe_ctrl | RW | Selected single-shot PE comparator control register에 access합니다. |
| 항목 | 전문 번역 |
|---|---|
| What | /sys/bus/coresight/devices/etm<N>/label |
| Date | 2025년 8월 |
| KernelVersion | 6.18 |
| Contact | Mao Jinlong <[email protected]> |
| Description | (Read) Device의 hardware context information을 보여 줍니다. |
ETM4x management register contents
338-435아래 management files는 /sys/bus/coresight/devices/etm<N>/mgmt/ 아래에 있으며 contact는 Mathieu Poirier <[email protected]>입니다.
| What suffix | Date / Kernel | Register | Offset | 전문 번역 |
|---|---|---|---|---|
| trcoslsr | 2015-04 / 4.01 | OS Lock Status | 0x304 | Hardware에서 직접 가져온 content를 출력합니다. |
| trcpdcr | 2015-04 / 4.01 | Power Down Control | 0x310 | Hardware에서 직접 가져온 content를 출력합니다. |
| trcpdsr | 2015-04 / 4.01 | Power Down Status | 0x314 | Hardware에서 직접 가져온 content를 출력합니다. |
| trclsr | 2015-04 / 4.01 | SW Lock Status | 0xFB4 | Hardware에서 직접 가져온 content를 출력합니다. |
| trcauthstatus | 2015-04 / 4.01 | Authentication Status | 0xFB8 | Hardware에서 직접 가져온 content를 출력합니다. |
| trcdevid | 2015-04 / 4.01 | Device ID | 0xFC8 | Hardware에서 직접 가져온 content를 출력합니다. |
| trcdevarch | 2021-01 / 5.12 | Device Architecture | 0xFBC | Hardware에서 직접 읽은 content를 출력합니다. |
| trcdevtype | 2015-04 / 4.01 | Device Type | 0xFCC | Hardware에서 직접 가져온 content를 출력합니다. |
| trcpidr0 | 2015-04 / 4.01 | Peripheral ID0 | 0xFE0 | Hardware에서 직접 가져온 content를 출력합니다. |
| trcpidr1 | 2015-04 / 4.01 | Peripheral ID1 | 0xFE4 | Hardware에서 직접 가져온 content를 출력합니다. |
| trcpidr2 | 2015-04 / 4.01 | Peripheral ID2 | 0xFE8 | Hardware에서 직접 가져온 content를 출력합니다. |
| trcpidr3 | 2015-04 / 4.01 | Peripheral ID3 | 0xFEC | Hardware에서 직접 가져온 content를 출력합니다. |
| trcconfig | 2016-02 / 4.07 | Trace Configuration | 0x010 | Software가 current setting으로 정한 register content를 출력합니다. |
| trctraceid | 2016-02 / 4.07 | Trace ID | 0x040 | Trace ID register content를 출력합니다. |
TRCIDR trace capabilities와 timestamp source
436-532| 공통 항목 | 내용 |
|---|---|
| Date | 2015년 4월 |
| KernelVersion | 4.01 |
| Contact | Mathieu Poirier <[email protected]> |
| 적용 범위 | lines 436-525의 TRCIDR attributes |
| What suffix | Offset | 전문 번역 |
|---|---|---|
| trcidr/trcidr0 | 0x1E0 | Trace unit의 tracing capabilities를 반환합니다. Hardware에서 직접 값을 가져옵니다. |
| trcidr/trcidr1 | 0x1E4 | Trace unit의 tracing capabilities를 반환합니다. Hardware에서 직접 값을 가져옵니다. |
| trcidr/trcidr2 | 0x1E8 | Trace unit에서 data value, data address, VMID, context ID와 instruction address의 maximum size를 반환합니다. Hardware에서 직접 값을 가져옵니다. |
| trcidr/trcidr3 | 0x1E8 | Trace unit에서 사용할 수 있는 여러 resource와 관련된 값을 반환합니다. 자세한 내용은 Trace Macrocell architecture specification을 참조하십시오. Hardware에서 직접 값을 가져옵니다. |
| trcidr/trcidr4 | 0x1F0 | Trace unit이 지원하는 resource 수를 반환합니다. Hardware에서 직접 값을 가져옵니다. |
| trcidr/trcidr5 | 0x1F4 | Trace unit이 지원하는 resource 수를 반환합니다. Hardware에서 직접 값을 가져옵니다. |
| trcidr/trcidr8 | 0x180 | Instruction trace stream의 maximum speculation depth를 반환합니다. Hardware에서 직접 값을 가져옵니다. |
| trcidr/trcidr9 | 0x184 | Trace unit이 사용할 수 있는 P0 right-hand keys 수를 반환합니다. Hardware에서 직접 값을 가져옵니다. |
| trcidr/trcidr10 | 0x188 | Trace unit이 사용할 수 있는 P1 right-hand keys 수를 반환합니다. Hardware에서 직접 값을 가져옵니다. |
| trcidr/trcidr11 | 0x18C | Trace unit이 사용할 수 있는 special P1 right-hand keys 수를 반환합니다. Hardware에서 직접 값을 가져옵니다. |
| trcidr/trcidr12 | 0x190 | Trace unit이 사용할 수 있는 conditional P1 right-hand keys 수를 반환합니다. Hardware에서 직접 값을 가져옵니다. |
| trcidr/trcidr13 | 0x194 | Trace unit이 사용할 수 있는 special conditional P1 right-hand keys 수를 반환합니다. Hardware에서 직접 값을 가져옵니다. |
| 항목 | 전문 번역 |
|---|---|
| What | /sys/bus/coresight/devices/etm<N>/ts_source |
| Date | 2022년 10월 |
| KernelVersion | 6.1 |
| Contact | Mathieu Poirier <[email protected]> |
| Description | (Read) FEAT_TRF가 구현되어 있으면 trace session에 사용하는 TRFCR_ELx.TS value입니다. 그렇지 않으면 -1이 unknown time source를 나타냅니다. Global timestamp를 사용할 수 있는지는 trcidr0.tssize를 확인하십시오. |
Trace source, affinity, capabilities와 mode
sysfs-bus-coresight-devices-etm4x:1-93enable_source는 configured ETM4x를 identified sink에 연결하고 cpu와 resource-count files가 affinity·hardware capabilities를 제공하며 reset·mode가 configuration lifecycle을 제어합니다.