summaryrefslogtreecommitdiffstats
path: root/sound/soc/sof/debug.c
blob: d2b3b99d3a20446865fa91c33e1cb931926af98a (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
// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
//
// This file is provided under a dual BSD/GPLv2 license.  When using or
// redistributing this file, you may do so under either license.
//
// Copyright(c) 2018 Intel Corporation. All rights reserved.
//
// Author: Liam Girdwood <liam.r.girdwood@linux.intel.com>
//
// Generic debug routines used to export DSP MMIO and memories to userspace
// for firmware debugging.
//

#include <linux/debugfs.h>
#include <linux/io.h>
#include <linux/pm_runtime.h>
#include "sof-priv.h"
#include "ops.h"

#if IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_IPC_FLOOD_TEST)
#define MAX_IPC_FLOOD_DURATION_MS 1000
#define MAX_IPC_FLOOD_COUNT 10000
#define IPC_FLOOD_TEST_RESULT_LEN 512

static int sof_debug_ipc_flood_test(struct snd_sof_dev *sdev,
				    struct snd_sof_dfsentry *dfse,
				    bool flood_duration_test,
				    unsigned long ipc_duration_ms,
				    unsigned long ipc_count)
{
	struct sof_ipc_cmd_hdr hdr;
	struct sof_ipc_reply reply;
	u64 min_response_time = U64_MAX;
	ktime_t start, end, test_end;
	u64 avg_response_time = 0;
	u64 max_response_time = 0;
	u64 ipc_response_time;
	int i = 0;
	int ret;

	/* configure test IPC */
	hdr.cmd = SOF_IPC_GLB_TEST_MSG | SOF_IPC_TEST_IPC_FLOOD;
	hdr.size = sizeof(hdr);

	/* set test end time for duration flood test */
	if (flood_duration_test)
		test_end = ktime_get_ns() + ipc_duration_ms * NSEC_PER_MSEC;

	/* send test IPC's */
	while (1) {
		start = ktime_get();
		ret = sof_ipc_tx_message(sdev->ipc, hdr.cmd, &hdr, hdr.size,
					 &reply, sizeof(reply));
		end = ktime_get();

		if (ret < 0)
			break;

		/* compute min and max response times */
		ipc_response_time = ktime_to_ns(ktime_sub(end, start));
		min_response_time = min(min_response_time, ipc_response_time);
		max_response_time = max(max_response_time, ipc_response_time);

		/* sum up response times */
		avg_response_time += ipc_response_time;
		i++;

		/* test complete? */
		if (flood_duration_test) {
			if (ktime_to_ns(end) >= test_end)
				break;
		} else {
			if (i == ipc_count)
				break;
		}
	}

	if (ret < 0)
		dev_err(sdev->dev,
			"error: ipc flood test failed at %d iterations\n", i);

	/* return if the first IPC fails */
	if (!i)
		return ret;

	/* compute average response time */
	do_div(avg_response_time, i);

	/* clear previous test output */
	memset(dfse->cache_buf, 0, IPC_FLOOD_TEST_RESULT_LEN);

	if (flood_duration_test) {
		dev_dbg(sdev->dev, "IPC Flood test duration: %lums\n",
			ipc_duration_ms);
		snprintf(dfse->cache_buf, IPC_FLOOD_TEST_RESULT_LEN,
			 "IPC Flood test duration: %lums\n", ipc_duration_ms);
	}

	dev_dbg(sdev->dev,
		"IPC Flood count: %d, Avg response time: %lluns\n",
		i, avg_response_time);
	dev_dbg(sdev->dev, "Max response time: %lluns\n",
		max_response_time);
	dev_dbg(sdev->dev, "Min response time: %lluns\n",
		min_response_time);

	/* format output string */
	snprintf(dfse->cache_buf + strlen(dfse->cache_buf),
		 IPC_FLOOD_TEST_RESULT_LEN - strlen(dfse->cache_buf),
		 "IPC Flood count: %d\nAvg response time: %lluns\n",
		 i, avg_response_time);

	snprintf(dfse->cache_buf + strlen(dfse->cache_buf),
		 IPC_FLOOD_TEST_RESULT_LEN - strlen(dfse->cache_buf),
		 "Max response time: %lluns\nMin response time: %lluns\n",
		 max_response_time, min_response_time);

	return ret;
}
#endif

static ssize_t sof_dfsentry_write(struct file *file, const char __user *buffer,
				  size_t count, loff_t *ppos)
{
#if IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_IPC_FLOOD_TEST)
	struct snd_sof_dfsentry *dfse = file->private_data;
	struct snd_sof_dev *sdev = dfse->sdev;
	unsigned long ipc_duration_ms = 0;
	bool flood_duration_test = false;
	unsigned long ipc_count = 0;
	struct dentry *dentry;
	int err;
#endif
	size_t size;
	char *string;
	int ret;

	string = kzalloc(count, GFP_KERNEL);
	if (!string)
		return -ENOMEM;

	size = simple_write_to_buffer(string, count, ppos, buffer, count);
	ret = size;

#if IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_IPC_FLOOD_TEST)
	/*
	 * write op is only supported for ipc_flood_count or
	 * ipc_flood_duration_ms debugfs entries atm.
	 * ipc_flood_count floods the DSP with the number of IPC's specified.
	 * ipc_duration_ms test floods the DSP for the time specified
	 * in the debugfs entry.
	 */
	dentry = file->f_path.dentry;
	if (strcmp(dentry->d_name.name, "ipc_flood_count") &&
	    strcmp(dentry->d_name.name, "ipc_flood_duration_ms")) {
		ret = -EINVAL;
		goto out;
	}

	if (!strcmp(dentry->d_name.name, "ipc_flood_duration_ms"))
		flood_duration_test = true;

	/* test completion criterion */
	if (flood_duration_test)
		ret = kstrtoul(string, 0, &ipc_duration_ms);
	else
		ret = kstrtoul(string, 0, &ipc_count);
	if (ret < 0)
		goto out;

	/* limit max duration/ipc count for flood test */
	if (flood_duration_test) {
		if (!ipc_duration_ms) {
			ret = size;
			goto out;
		}

		/* find the minimum. min() is not used to avoid warnings */
		if (ipc_duration_ms > MAX_IPC_FLOOD_DURATION_MS)
			ipc_duration_ms = MAX_IPC_FLOOD_DURATION_MS;
	} else {
		if (!ipc_count) {
			ret = size;
			goto out;
		}

		/* find the minimum. min() is not used to avoid warnings */
		if (ipc_count > MAX_IPC_FLOOD_COUNT)
			ipc_count = MAX_IPC_FLOOD_COUNT;
	}

	ret = pm_runtime_get_sync(sdev->dev);
	if (ret < 0) {
		dev_err_ratelimited(sdev->dev,
				    "error: debugfs write failed to resume %d\n",
				    ret);
		pm_runtime_put_noidle(sdev->dev);
		goto out;
	}

	/* flood test */
	ret = sof_debug_ipc_flood_test(sdev, dfse, flood_duration_test,
				       ipc_duration_ms, ipc_count);

	pm_runtime_mark_last_busy(sdev->dev);
	err = pm_runtime_put_autosuspend(sdev->dev);
	if (err < 0)
		dev_err_ratelimited(sdev->dev,
				    "error: debugfs write failed to idle %d\n",
				    err);

	/* return size if test is successful */
	if (ret >= 0)
		ret = size;
out:
#endif
	kfree(string);
	return ret;
}

static ssize_t sof_dfsentry_read(struct file *file, char __user *buffer,
				 size_t count, loff_t *ppos)
{
	struct snd_sof_dfsentry *dfse = file->private_data;
	struct snd_sof_dev *sdev = dfse->sdev;
	loff_t pos = *ppos;
	size_t size_ret;
	int skip = 0;
	int size;
	u8 *buf;

#if IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_IPC_FLOOD_TEST)
	struct dentry *dentry;

	dentry = file->f_path.dentry;
	if ((!strcmp(dentry->d_name.name, "ipc_flood_count") ||
	     !strcmp(dentry->d_name.name, "ipc_flood_duration_ms")) &&
	    dfse->cache_buf) {
		if (*ppos)
			return 0;

		count = strlen(dfse->cache_buf);
		size_ret = copy_to_user(buffer, dfse->cache_buf, count);
		if (size_ret)
			return -EFAULT;

		*ppos += count;
		return count;
	}
#endif
	size = dfse->size;

	/* validate position & count */
	if (pos < 0)
		return -EINVAL;
	if (pos >= size || !count)
		return 0;
	/* find the minimum. min() is not used since it adds sparse warnings */
	if (count > size - pos)
		count = size - pos;

	/* align io read start to u32 multiple */
	pos = ALIGN_DOWN(pos, 4);

	/* intermediate buffer size must be u32 multiple */
	size = ALIGN(count, 4);

	/* if start position is unaligned, read extra u32 */
	if (unlikely(pos != *ppos)) {
		skip = *ppos - pos;
		if (pos + size + 4 < dfse->size)
			size += 4;
	}

	buf = kzalloc(size, GFP_KERNEL);
	if (!buf)
		return -ENOMEM;

	if (dfse->type == SOF_DFSENTRY_TYPE_IOMEM) {
#if IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_ENABLE_DEBUGFS_CACHE)
		/*
		 * If the DSP is active: copy from IO.
		 * If the DSP is suspended:
		 *	- Copy from IO if the memory is always accessible.
		 *	- Otherwise, copy from cached buffer.
		 */
		if (pm_runtime_active(sdev->dev) ||
		    dfse->access_type == SOF_DEBUGFS_ACCESS_ALWAYS) {
			memcpy_fromio(buf, dfse->io_mem + pos, size);
		} else {
			dev_info(sdev->dev,
				 "Copying cached debugfs data\n");
			memcpy(buf, dfse->cache_buf + pos, size);
		}
#else
		/* if the DSP is in D3 */
		if (!pm_runtime_active(sdev->dev) &&
		    dfse->access_type == SOF_DEBUGFS_ACCESS_D0_ONLY) {
			dev_err(sdev->dev,
				"error: debugfs entry cannot be read in DSP D3\n");
			kfree(buf);
			return -EINVAL;
		}

		memcpy_fromio(buf, dfse->io_mem + pos, size);
#endif
	} else {
		memcpy(buf, ((u8 *)(dfse->buf) + pos), size);
	}

	/* copy to userspace */
	size_ret = copy_to_user(buffer, buf + skip, count);

	kfree(buf);

	/* update count & position if copy succeeded */
	if (size_ret)
		return -EFAULT;

	*ppos = pos + count;

	return count;
}

static const struct file_operations sof_dfs_fops = {
	.open = simple_open,
	.read = sof_dfsentry_read,
	.llseek = default_llseek,
	.write = sof_dfsentry_write,
};

/* create FS entry for debug files that can expose DSP memories, registers */
int snd_sof_debugfs_io_item(struct snd_sof_dev *sdev,
			    void __iomem *base, size_t size,
			    const char *name,
			    enum sof_debugfs_access_type access_type)
{
	struct snd_sof_dfsentry *dfse;

	if (!sdev)
		return -EINVAL;

	dfse = devm_kzalloc(sdev->dev, sizeof(*dfse), GFP_KERNEL);
	if (!dfse)
		return -ENOMEM;

	dfse->type = SOF_DFSENTRY_TYPE_IOMEM;
	dfse->io_mem = base;
	dfse->size = size;
	dfse->sdev = sdev;
	dfse->access_type = access_type;

#if IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_ENABLE_DEBUGFS_CACHE)
	/*
	 * allocate cache buffer that will be used to save the mem window
	 * contents prior to suspend
	 */
	if (access_type == SOF_DEBUGFS_ACCESS_D0_ONLY) {
		dfse->cache_buf = devm_kzalloc(sdev->dev, size, GFP_KERNEL);
		if (!dfse->cache_buf)
			return -ENOMEM;
	}
#endif

	debugfs_create_file(name, 0444, sdev->debugfs_root, dfse,
			    &sof_dfs_fops);

	/* add to dfsentry list */
	list_add(&dfse->list, &sdev->dfsentry_list);

	return 0;
}
EXPORT_SYMBOL_GPL(snd_sof_debugfs_io_item);

/* create FS entry for debug files to expose kernel memory */
int snd_sof_debugfs_buf_item(struct snd_sof_dev *sdev,
			     void *base, size_t size,
			     const char *name, mode_t mode)
{
	struct snd_sof_dfsentry *dfse;

	if (!sdev)
		return -EINVAL;

	dfse = devm_kzalloc(sdev->dev, sizeof(*dfse), GFP_KERNEL);
	if (!dfse)
		return -ENOMEM;

	dfse->type = SOF_DFSENTRY_TYPE_BUF;
	dfse->buf = base;
	dfse->size = size;
	dfse->sdev = sdev;

#if IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_IPC_FLOOD_TEST)
	/*
	 * cache_buf is unused for SOF_DFSENTRY_TYPE_BUF debugfs entries.
	 * So, use it to save the results of the last IPC flood test.
	 */
	dfse->cache_buf = devm_kzalloc(sdev->dev, IPC_FLOOD_TEST_RESULT_LEN,
				       GFP_KERNEL);
	if (!dfse->cache_buf)
		return -ENOMEM;
#endif

	debugfs_create_file(name, mode, sdev->debugfs_root, dfse,
			    &sof_dfs_fops);
	/* add to dfsentry list */
	list_add(&dfse->list, &sdev->dfsentry_list);

	return 0;
}
EXPORT_SYMBOL_GPL(snd_sof_debugfs_buf_item);

int snd_sof_dbg_init(struct snd_sof_dev *sdev)
{
	const struct snd_sof_dsp_ops *ops = sof_ops(sdev);
	const struct snd_sof_debugfs_map *map;
	int i;
	int err;

	/* use "sof" as top level debugFS dir */
	sdev->debugfs_root = debugfs_create_dir("sof", NULL);

	/* init dfsentry list */
	INIT_LIST_HEAD(&sdev->dfsentry_list);

	/* create debugFS files for platform specific MMIO/DSP memories */
	for (i = 0; i < ops->debug_map_count; i++) {
		map = &ops->debug_map[i];

		err = snd_sof_debugfs_io_item(sdev, sdev->bar[map->bar] +
					      map->offset, map->size,
					      map->name, map->access_type);
		/* errors are only due to memory allocation, not debugfs */
		if (err < 0)
			return err;
	}

#if IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_IPC_FLOOD_TEST)
	/* create read-write ipc_flood_count debugfs entry */
	err = snd_sof_debugfs_buf_item(sdev, NULL, 0,
				       "ipc_flood_count", 0666);

	/* errors are only due to memory allocation, not debugfs */
	if (err < 0)
		return err;

	/* create read-write ipc_flood_duration_ms debugfs entry */
	err = snd_sof_debugfs_buf_item(sdev, NULL, 0,
				       "ipc_flood_duration_ms", 0666);

	/* errors are only due to memory allocation, not debugfs */
	if (err < 0)
		return err;
#endif

	return 0;
}
EXPORT_SYMBOL_GPL(snd_sof_dbg_init);

void snd_sof_free_debug(struct snd_sof_dev *sdev)
{
	debugfs_remove_recursive(sdev->debugfs_root);
}
EXPORT_SYMBOL_GPL(snd_sof_free_debug);

void snd_sof_handle_fw_exception(struct snd_sof_dev *sdev)
{
	if (IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_RETAIN_DSP_CONTEXT) ||
	    (sof_core_debug & SOF_DBG_RETAIN_CTX)) {
		/* should we prevent DSP entering D3 ? */
		dev_info(sdev->dev, "info: preventing DSP entering D3 state to preserve context\n");
		pm_runtime_get_noresume(sdev->dev);
	}

	/* dump vital information to the logs */
	snd_sof_dsp_dbg_dump(sdev, SOF_DBG_REGS | SOF_DBG_MBOX);
	snd_sof_ipc_dump(sdev);
	snd_sof_trace_notify_for_error(sdev);
}
EXPORT_SYMBOL(snd_sof_handle_fw_exception);