1// SPDX-License-Identifier: GPL-2.0-only
2//
3// Copyright(c) 2022 Intel Corporation. All rights reserved.
4//
5// Author: Liam Girdwood <liam.r.girdwood@linux.intel.com>
6
7#include <linux/debugfs.h>
8#include <linux/sched/signal.h>
9#include "sof-priv.h"
10#include "sof-audio.h"
11#include "ops.h"
12#include "sof-utils.h"
13#include "ipc3-priv.h"
14
15#define TRACE_FILTER_ELEMENTS_PER_ENTRY 4
16#define TRACE_FILTER_MAX_CONFIG_STRING_LENGTH 1024
17
18enum sof_dtrace_state {
19 SOF_DTRACE_DISABLED,
20 SOF_DTRACE_STOPPED,
21 SOF_DTRACE_INITIALIZING,
22 SOF_DTRACE_ENABLED,
23};
24
25struct sof_dtrace_priv {
26 struct snd_dma_buffer dmatb;
27 struct snd_dma_buffer dmatp;
28 int dma_trace_pages;
29 wait_queue_head_t trace_sleep;
30 u32 host_offset;
31 bool dtrace_error;
32 bool dtrace_draining;
33 enum sof_dtrace_state dtrace_state;
34};
35
36static bool trace_pos_update_expected(struct sof_dtrace_priv *priv)
37{
38 if (priv->dtrace_state == SOF_DTRACE_ENABLED ||
39 priv->dtrace_state == SOF_DTRACE_INITIALIZING)
40 return true;
41
42 return false;
43}
44
45static int trace_filter_append_elem(struct snd_sof_dev *sdev, u32 key, u32 value,
46 struct sof_ipc_trace_filter_elem *elem_list,
47 int capacity, int *counter)
48{
49 if (*counter >= capacity)
50 return -ENOMEM;
51
52 elem_list[*counter].key = key;
53 elem_list[*counter].value = value;
54 ++*counter;
55
56 return 0;
57}
58
59static int trace_filter_parse_entry(struct snd_sof_dev *sdev, const char *line,
60 struct sof_ipc_trace_filter_elem *elem,
61 int capacity, int *counter)
62{
63 int log_level, pipe_id, comp_id, read, ret;
64 int len = strlen(line);
65 int cnt = *counter;
66 u32 uuid_id;
67
68 /* ignore empty content */
69 ret = sscanf(line, " %n", &read);
70 if (!ret && read == len)
71 return len;
72
73 ret = sscanf(line, " %d %x %d %d %n", &log_level, &uuid_id, &pipe_id, &comp_id, &read);
74 if (ret != TRACE_FILTER_ELEMENTS_PER_ENTRY || read != len) {
75 dev_err(sdev->dev, "Invalid trace filter entry '%s'\n", line);
76 return -EINVAL;
77 }
78
79 if (uuid_id > 0) {
80 ret = trace_filter_append_elem(sdev, SOF_IPC_TRACE_FILTER_ELEM_BY_UUID,
81 value: uuid_id, elem_list: elem, capacity, counter: &cnt);
82 if (ret)
83 return ret;
84 }
85 if (pipe_id >= 0) {
86 ret = trace_filter_append_elem(sdev, SOF_IPC_TRACE_FILTER_ELEM_BY_PIPE,
87 value: pipe_id, elem_list: elem, capacity, counter: &cnt);
88 if (ret)
89 return ret;
90 }
91 if (comp_id >= 0) {
92 ret = trace_filter_append_elem(sdev, SOF_IPC_TRACE_FILTER_ELEM_BY_COMP,
93 value: comp_id, elem_list: elem, capacity, counter: &cnt);
94 if (ret)
95 return ret;
96 }
97
98 ret = trace_filter_append_elem(sdev, SOF_IPC_TRACE_FILTER_ELEM_SET_LEVEL |
99 SOF_IPC_TRACE_FILTER_ELEM_FIN,
100 value: log_level, elem_list: elem, capacity, counter: &cnt);
101 if (ret)
102 return ret;
103
104 /* update counter only when parsing whole entry passed */
105 *counter = cnt;
106
107 return len;
108}
109
110static int trace_filter_parse(struct snd_sof_dev *sdev, char *string,
111 int *out_elem_cnt,
112 struct sof_ipc_trace_filter_elem **out)
113{
114 static const char entry_delimiter[] = ";";
115 char *entry = string;
116 int capacity = 0;
117 int entry_len;
118 int cnt = 0;
119
120 /*
121 * Each entry contains at least 1, up to TRACE_FILTER_ELEMENTS_PER_ENTRY
122 * IPC elements, depending on content. Calculate IPC elements capacity
123 * for the input string where each element is set.
124 */
125 while (entry) {
126 capacity += TRACE_FILTER_ELEMENTS_PER_ENTRY;
127 entry = strchr(entry + 1, entry_delimiter[0]);
128 }
129 *out = kmalloc(size: capacity * sizeof(**out), GFP_KERNEL);
130 if (!*out)
131 return -ENOMEM;
132
133 /* split input string by ';', and parse each entry separately in trace_filter_parse_entry */
134 while ((entry = strsep(&string, entry_delimiter))) {
135 entry_len = trace_filter_parse_entry(sdev, line: entry, elem: *out, capacity, counter: &cnt);
136 if (entry_len < 0) {
137 dev_err(sdev->dev,
138 "Parsing filter entry '%s' failed with %d\n",
139 entry, entry_len);
140 return -EINVAL;
141 }
142 }
143
144 *out_elem_cnt = cnt;
145
146 return 0;
147}
148
149static int ipc3_trace_update_filter(struct snd_sof_dev *sdev, int num_elems,
150 struct sof_ipc_trace_filter_elem *elems)
151{
152 struct sof_ipc_trace_filter *msg;
153 size_t size;
154 int ret;
155
156 size = struct_size(msg, elems, num_elems);
157 if (size > SOF_IPC_MSG_MAX_SIZE)
158 return -EINVAL;
159
160 msg = kmalloc(size, GFP_KERNEL);
161 if (!msg)
162 return -ENOMEM;
163
164 msg->hdr.size = size;
165 msg->hdr.cmd = SOF_IPC_GLB_TRACE_MSG | SOF_IPC_TRACE_FILTER_UPDATE;
166 msg->elem_cnt = num_elems;
167 memcpy(&msg->elems[0], elems, num_elems * sizeof(*elems));
168
169 ret = pm_runtime_resume_and_get(dev: sdev->dev);
170 if (ret < 0 && ret != -EACCES) {
171 dev_err(sdev->dev, "enabling device failed: %d\n", ret);
172 goto error;
173 }
174 ret = sof_ipc_tx_message_no_reply(ipc: sdev->ipc, msg_data: msg, msg_bytes: msg->hdr.size);
175 pm_runtime_mark_last_busy(dev: sdev->dev);
176 pm_runtime_put_autosuspend(dev: sdev->dev);
177
178error:
179 kfree(objp: msg);
180 return ret;
181}
182
183static ssize_t dfsentry_trace_filter_write(struct file *file, const char __user *from,
184 size_t count, loff_t *ppos)
185{
186 struct snd_sof_dfsentry *dfse = file->private_data;
187 struct sof_ipc_trace_filter_elem *elems = NULL;
188 struct snd_sof_dev *sdev = dfse->sdev;
189 int num_elems;
190 char *string;
191 int ret;
192
193 if (count > TRACE_FILTER_MAX_CONFIG_STRING_LENGTH) {
194 dev_err(sdev->dev, "%s too long input, %zu > %d\n", __func__, count,
195 TRACE_FILTER_MAX_CONFIG_STRING_LENGTH);
196 return -EINVAL;
197 }
198
199 string = memdup_user_nul(from, count);
200 if (IS_ERR(ptr: string))
201 return PTR_ERR(ptr: string);
202
203 ret = trace_filter_parse(sdev, string, out_elem_cnt: &num_elems, out: &elems);
204 if (ret < 0)
205 goto error;
206
207 if (num_elems) {
208 ret = ipc3_trace_update_filter(sdev, num_elems, elems);
209 if (ret < 0) {
210 dev_err(sdev->dev, "Filter update failed: %d\n", ret);
211 goto error;
212 }
213 }
214 ret = count;
215error:
216 kfree(objp: string);
217 kfree(objp: elems);
218 return ret;
219}
220
221static const struct file_operations sof_dfs_trace_filter_fops = {
222 .open = simple_open,
223 .write = dfsentry_trace_filter_write,
224 .llseek = default_llseek,
225};
226
227static int debugfs_create_trace_filter(struct snd_sof_dev *sdev)
228{
229 struct snd_sof_dfsentry *dfse;
230
231 dfse = devm_kzalloc(dev: sdev->dev, size: sizeof(*dfse), GFP_KERNEL);
232 if (!dfse)
233 return -ENOMEM;
234
235 dfse->sdev = sdev;
236 dfse->type = SOF_DFSENTRY_TYPE_BUF;
237
238 debugfs_create_file(name: "filter", mode: 0200, parent: sdev->debugfs_root, data: dfse,
239 fops: &sof_dfs_trace_filter_fops);
240 /* add to dfsentry list */
241 list_add(new: &dfse->list, head: &sdev->dfsentry_list);
242
243 return 0;
244}
245
246static bool sof_dtrace_set_host_offset(struct sof_dtrace_priv *priv, u32 new_offset)
247{
248 u32 host_offset = READ_ONCE(priv->host_offset);
249
250 if (host_offset != new_offset) {
251 /* This is a bit paranoid and unlikely that it is needed */
252 u32 ret = cmpxchg(&priv->host_offset, host_offset, new_offset);
253
254 if (ret == host_offset)
255 return true;
256 }
257
258 return false;
259}
260
261static size_t sof_dtrace_avail(struct snd_sof_dev *sdev,
262 loff_t pos, size_t buffer_size)
263{
264 struct sof_dtrace_priv *priv = sdev->fw_trace_data;
265 loff_t host_offset = READ_ONCE(priv->host_offset);
266
267 /*
268 * If host offset is less than local pos, it means write pointer of
269 * host DMA buffer has been wrapped. We should output the trace data
270 * at the end of host DMA buffer at first.
271 */
272 if (host_offset < pos)
273 return buffer_size - pos;
274
275 /* If there is available trace data now, it is unnecessary to wait. */
276 if (host_offset > pos)
277 return host_offset - pos;
278
279 return 0;
280}
281
282static size_t sof_wait_dtrace_avail(struct snd_sof_dev *sdev, loff_t pos,
283 size_t buffer_size)
284{
285 size_t ret = sof_dtrace_avail(sdev, pos, buffer_size);
286 struct sof_dtrace_priv *priv = sdev->fw_trace_data;
287 wait_queue_entry_t wait;
288
289 /* data immediately available */
290 if (ret)
291 return ret;
292
293 if (priv->dtrace_draining && !trace_pos_update_expected(priv)) {
294 /*
295 * tracing has ended and all traces have been
296 * read by client, return EOF
297 */
298 priv->dtrace_draining = false;
299 return 0;
300 }
301
302 /* wait for available trace data from FW */
303 init_waitqueue_entry(wq_entry: &wait, current);
304 set_current_state(TASK_INTERRUPTIBLE);
305 add_wait_queue(wq_head: &priv->trace_sleep, wq_entry: &wait);
306
307 if (!signal_pending(current)) {
308 /* set timeout to max value, no error code */
309 schedule_timeout(MAX_SCHEDULE_TIMEOUT);
310 }
311 remove_wait_queue(wq_head: &priv->trace_sleep, wq_entry: &wait);
312
313 return sof_dtrace_avail(sdev, pos, buffer_size);
314}
315
316static ssize_t dfsentry_dtrace_read(struct file *file, char __user *buffer,
317 size_t count, loff_t *ppos)
318{
319 struct snd_sof_dfsentry *dfse = file->private_data;
320 struct snd_sof_dev *sdev = dfse->sdev;
321 struct sof_dtrace_priv *priv = sdev->fw_trace_data;
322 unsigned long rem;
323 loff_t lpos = *ppos;
324 size_t avail, buffer_size = dfse->size;
325 u64 lpos_64;
326
327 /* make sure we know about any failures on the DSP side */
328 priv->dtrace_error = false;
329
330 /* check pos and count */
331 if (lpos < 0)
332 return -EINVAL;
333 if (!count)
334 return 0;
335
336 /* check for buffer wrap and count overflow */
337 lpos_64 = lpos;
338 lpos = do_div(lpos_64, buffer_size);
339
340 /* get available count based on current host offset */
341 avail = sof_wait_dtrace_avail(sdev, pos: lpos, buffer_size);
342 if (priv->dtrace_error) {
343 dev_err(sdev->dev, "trace IO error\n");
344 return -EIO;
345 }
346
347 /* no new trace data */
348 if (!avail)
349 return 0;
350
351 /* make sure count is <= avail */
352 if (count > avail)
353 count = avail;
354
355 /*
356 * make sure that all trace data is available for the CPU as the trace
357 * data buffer might be allocated from non consistent memory.
358 * Note: snd_dma_buffer_sync() is called for normal audio playback and
359 * capture streams also.
360 */
361 snd_dma_buffer_sync(dmab: &priv->dmatb, mode: SNDRV_DMA_SYNC_CPU);
362 /* copy available trace data to debugfs */
363 rem = copy_to_user(to: buffer, from: ((u8 *)(dfse->buf) + lpos), n: count);
364 if (rem)
365 return -EFAULT;
366
367 *ppos += count;
368
369 /* move debugfs reading position */
370 return count;
371}
372
373static int dfsentry_dtrace_release(struct inode *inode, struct file *file)
374{
375 struct snd_sof_dfsentry *dfse = inode->i_private;
376 struct snd_sof_dev *sdev = dfse->sdev;
377 struct sof_dtrace_priv *priv = sdev->fw_trace_data;
378
379 /* avoid duplicate traces at next open */
380 if (priv->dtrace_state != SOF_DTRACE_ENABLED)
381 sof_dtrace_set_host_offset(priv, new_offset: 0);
382
383 return 0;
384}
385
386static const struct file_operations sof_dfs_dtrace_fops = {
387 .open = simple_open,
388 .read = dfsentry_dtrace_read,
389 .llseek = default_llseek,
390 .release = dfsentry_dtrace_release,
391};
392
393static int debugfs_create_dtrace(struct snd_sof_dev *sdev)
394{
395 struct sof_dtrace_priv *priv;
396 struct snd_sof_dfsentry *dfse;
397 int ret;
398
399 if (!sdev)
400 return -EINVAL;
401
402 priv = sdev->fw_trace_data;
403
404 ret = debugfs_create_trace_filter(sdev);
405 if (ret < 0)
406 dev_warn(sdev->dev, "failed to create filter debugfs file: %d", ret);
407
408 dfse = devm_kzalloc(dev: sdev->dev, size: sizeof(*dfse), GFP_KERNEL);
409 if (!dfse)
410 return -ENOMEM;
411
412 dfse->type = SOF_DFSENTRY_TYPE_BUF;
413 dfse->buf = priv->dmatb.area;
414 dfse->size = priv->dmatb.bytes;
415 dfse->sdev = sdev;
416
417 debugfs_create_file(name: "trace", mode: 0444, parent: sdev->debugfs_root, data: dfse,
418 fops: &sof_dfs_dtrace_fops);
419
420 return 0;
421}
422
423static int ipc3_dtrace_enable(struct snd_sof_dev *sdev)
424{
425 struct sof_dtrace_priv *priv = sdev->fw_trace_data;
426 struct sof_ipc_fw_ready *ready = &sdev->fw_ready;
427 struct sof_ipc_fw_version *v = &ready->version;
428 struct sof_ipc_dma_trace_params_ext params;
429 int ret;
430
431 if (!sdev->fw_trace_is_supported)
432 return 0;
433
434 if (priv->dtrace_state == SOF_DTRACE_ENABLED || !priv->dma_trace_pages)
435 return -EINVAL;
436
437 if (priv->dtrace_state == SOF_DTRACE_STOPPED)
438 goto start;
439
440 /* set IPC parameters */
441 params.hdr.cmd = SOF_IPC_GLB_TRACE_MSG;
442 /* PARAMS_EXT is only supported from ABI 3.7.0 onwards */
443 if (v->abi_version >= SOF_ABI_VER(3, 7, 0)) {
444 params.hdr.size = sizeof(struct sof_ipc_dma_trace_params_ext);
445 params.hdr.cmd |= SOF_IPC_TRACE_DMA_PARAMS_EXT;
446 params.timestamp_ns = ktime_get(); /* in nanosecond */
447 } else {
448 params.hdr.size = sizeof(struct sof_ipc_dma_trace_params);
449 params.hdr.cmd |= SOF_IPC_TRACE_DMA_PARAMS;
450 }
451 params.buffer.phy_addr = priv->dmatp.addr;
452 params.buffer.size = priv->dmatb.bytes;
453 params.buffer.pages = priv->dma_trace_pages;
454 params.stream_tag = 0;
455
456 sof_dtrace_set_host_offset(priv, new_offset: 0);
457 priv->dtrace_draining = false;
458
459 ret = sof_dtrace_host_init(sdev, dmatb: &priv->dmatb, dtrace_params: &params);
460 if (ret < 0) {
461 dev_err(sdev->dev, "Host dtrace init failed: %d\n", ret);
462 return ret;
463 }
464 dev_dbg(sdev->dev, "stream_tag: %d\n", params.stream_tag);
465
466 /* send IPC to the DSP */
467 priv->dtrace_state = SOF_DTRACE_INITIALIZING;
468 ret = sof_ipc_tx_message_no_reply(ipc: sdev->ipc, msg_data: &params, msg_bytes: sizeof(params));
469 if (ret < 0) {
470 dev_err(sdev->dev, "can't set params for DMA for trace %d\n", ret);
471 goto trace_release;
472 }
473
474start:
475 priv->dtrace_state = SOF_DTRACE_ENABLED;
476
477 ret = sof_dtrace_host_trigger(sdev, SNDRV_PCM_TRIGGER_START);
478 if (ret < 0) {
479 dev_err(sdev->dev, "Host dtrace trigger start failed: %d\n", ret);
480 goto trace_release;
481 }
482
483 return 0;
484
485trace_release:
486 priv->dtrace_state = SOF_DTRACE_DISABLED;
487 sof_dtrace_host_release(sdev);
488 return ret;
489}
490
491static int ipc3_dtrace_init(struct snd_sof_dev *sdev)
492{
493 struct sof_dtrace_priv *priv;
494 int ret;
495
496 /* dtrace is only supported with SOF_IPC */
497 if (sdev->pdata->ipc_type != SOF_IPC_TYPE_3)
498 return -EOPNOTSUPP;
499
500 if (sdev->fw_trace_data) {
501 dev_err(sdev->dev, "fw_trace_data has been already allocated\n");
502 return -EBUSY;
503 }
504
505 priv = devm_kzalloc(dev: sdev->dev, size: sizeof(*priv), GFP_KERNEL);
506 if (!priv)
507 return -ENOMEM;
508
509 sdev->fw_trace_data = priv;
510
511 /* set false before start initialization */
512 priv->dtrace_state = SOF_DTRACE_DISABLED;
513
514 /* allocate trace page table buffer */
515 ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, dev: sdev->dev,
516 PAGE_SIZE, dmab: &priv->dmatp);
517 if (ret < 0) {
518 dev_err(sdev->dev, "can't alloc page table for trace %d\n", ret);
519 return ret;
520 }
521
522 /* allocate trace data buffer */
523 ret = snd_dma_alloc_dir_pages(SNDRV_DMA_TYPE_DEV_SG, dev: sdev->dev,
524 dir: DMA_FROM_DEVICE, DMA_BUF_SIZE_FOR_TRACE,
525 dmab: &priv->dmatb);
526 if (ret < 0) {
527 dev_err(sdev->dev, "can't alloc buffer for trace %d\n", ret);
528 goto page_err;
529 }
530
531 /* create compressed page table for audio firmware */
532 ret = snd_sof_create_page_table(dev: sdev->dev, dmab: &priv->dmatb,
533 page_table: priv->dmatp.area, size: priv->dmatb.bytes);
534 if (ret < 0)
535 goto table_err;
536
537 priv->dma_trace_pages = ret;
538 dev_dbg(sdev->dev, "dma_trace_pages: %d\n", priv->dma_trace_pages);
539
540 if (sdev->first_boot) {
541 ret = debugfs_create_dtrace(sdev);
542 if (ret < 0)
543 goto table_err;
544 }
545
546 init_waitqueue_head(&priv->trace_sleep);
547
548 ret = ipc3_dtrace_enable(sdev);
549 if (ret < 0)
550 goto table_err;
551
552 return 0;
553table_err:
554 priv->dma_trace_pages = 0;
555 snd_dma_free_pages(dmab: &priv->dmatb);
556page_err:
557 snd_dma_free_pages(dmab: &priv->dmatp);
558 return ret;
559}
560
561int ipc3_dtrace_posn_update(struct snd_sof_dev *sdev,
562 struct sof_ipc_dma_trace_posn *posn)
563{
564 struct sof_dtrace_priv *priv = sdev->fw_trace_data;
565
566 if (!sdev->fw_trace_is_supported)
567 return 0;
568
569 if (trace_pos_update_expected(priv) &&
570 sof_dtrace_set_host_offset(priv, new_offset: posn->host_offset))
571 wake_up(&priv->trace_sleep);
572
573 if (posn->overflow != 0)
574 dev_err(sdev->dev,
575 "DSP trace buffer overflow %u bytes. Total messages %d\n",
576 posn->overflow, posn->messages);
577
578 return 0;
579}
580
581/* an error has occurred within the DSP that prevents further trace */
582static void ipc3_dtrace_fw_crashed(struct snd_sof_dev *sdev)
583{
584 struct sof_dtrace_priv *priv = sdev->fw_trace_data;
585
586 if (priv->dtrace_state == SOF_DTRACE_ENABLED) {
587 priv->dtrace_error = true;
588 wake_up(&priv->trace_sleep);
589 }
590}
591
592static void ipc3_dtrace_release(struct snd_sof_dev *sdev, bool only_stop)
593{
594 struct sof_dtrace_priv *priv = sdev->fw_trace_data;
595 struct sof_ipc_fw_ready *ready = &sdev->fw_ready;
596 struct sof_ipc_fw_version *v = &ready->version;
597 struct sof_ipc_cmd_hdr hdr;
598 int ret;
599
600 if (!sdev->fw_trace_is_supported || priv->dtrace_state == SOF_DTRACE_DISABLED)
601 return;
602
603 ret = sof_dtrace_host_trigger(sdev, SNDRV_PCM_TRIGGER_STOP);
604 if (ret < 0)
605 dev_err(sdev->dev, "Host dtrace trigger stop failed: %d\n", ret);
606 priv->dtrace_state = SOF_DTRACE_STOPPED;
607
608 /*
609 * stop and free trace DMA in the DSP. TRACE_DMA_FREE is only supported from
610 * ABI 3.20.0 onwards
611 */
612 if (v->abi_version >= SOF_ABI_VER(3, 20, 0)) {
613 hdr.size = sizeof(hdr);
614 hdr.cmd = SOF_IPC_GLB_TRACE_MSG | SOF_IPC_TRACE_DMA_FREE;
615
616 ret = sof_ipc_tx_message_no_reply(ipc: sdev->ipc, msg_data: &hdr, msg_bytes: hdr.size);
617 if (ret < 0)
618 dev_err(sdev->dev, "DMA_TRACE_FREE failed with error: %d\n", ret);
619 }
620
621 if (only_stop)
622 goto out;
623
624 ret = sof_dtrace_host_release(sdev);
625 if (ret < 0)
626 dev_err(sdev->dev, "Host dtrace release failed %d\n", ret);
627
628 priv->dtrace_state = SOF_DTRACE_DISABLED;
629
630out:
631 priv->dtrace_draining = true;
632 wake_up(&priv->trace_sleep);
633}
634
635static void ipc3_dtrace_suspend(struct snd_sof_dev *sdev, pm_message_t pm_state)
636{
637 ipc3_dtrace_release(sdev, only_stop: pm_state.event == SOF_DSP_PM_D0);
638}
639
640static int ipc3_dtrace_resume(struct snd_sof_dev *sdev)
641{
642 return ipc3_dtrace_enable(sdev);
643}
644
645static void ipc3_dtrace_free(struct snd_sof_dev *sdev)
646{
647 struct sof_dtrace_priv *priv = sdev->fw_trace_data;
648
649 /* release trace */
650 ipc3_dtrace_release(sdev, only_stop: false);
651
652 if (priv->dma_trace_pages) {
653 snd_dma_free_pages(dmab: &priv->dmatb);
654 snd_dma_free_pages(dmab: &priv->dmatp);
655 priv->dma_trace_pages = 0;
656 }
657}
658
659const struct sof_ipc_fw_tracing_ops ipc3_dtrace_ops = {
660 .init = ipc3_dtrace_init,
661 .free = ipc3_dtrace_free,
662 .fw_crashed = ipc3_dtrace_fw_crashed,
663 .suspend = ipc3_dtrace_suspend,
664 .resume = ipc3_dtrace_resume,
665};
666

source code of linux/sound/soc/sof/ipc3-dtrace.c