summaryrefslogtreecommitdiffstats
path: root/sound/soc/sof/trace.c
blob: befed975161cb74edaf958a6aeb93ad919cd0a4c (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
// 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>
//

#include <linux/debugfs.h>
#include <linux/sched/signal.h>
#include "sof-priv.h"
#include "ops.h"

static size_t sof_trace_avail(struct snd_sof_dev *sdev,
			      loff_t pos, size_t buffer_size)
{
	loff_t host_offset = READ_ONCE(sdev->host_offset);

	/*
	 * If host offset is less than local pos, it means write pointer of
	 * host DMA buffer has been wrapped. We should output the trace data
	 * at the end of host DMA buffer at first.
	 */
	if (host_offset < pos)
		return buffer_size - pos;

	/* If there is available trace data now, it is unnecessary to wait. */
	if (host_offset > pos)
		return host_offset - pos;

	return 0;
}

static size_t sof_wait_trace_avail(struct snd_sof_dev *sdev,
				   loff_t pos, size_t buffer_size)
{
	wait_queue_entry_t wait;
	size_t ret = sof_trace_avail(sdev, pos, buffer_size);

	/* data immediately available */
	if (ret)
		return ret;

	if (!sdev->dtrace_is_enabled && sdev->dtrace_draining) {
		/*
		 * tracing has ended and all traces have been
		 * read by client, return EOF
		 */
		sdev->dtrace_draining = false;
		return 0;
	}

	/* wait for available trace data from FW */
	init_waitqueue_entry(&wait, current);
	set_current_state(TASK_INTERRUPTIBLE);
	add_wait_queue(&sdev->trace_sleep, &wait);

	if (!signal_pending(current)) {
		/* set timeout to max value, no error code */
		schedule_timeout(MAX_SCHEDULE_TIMEOUT);
	}
	remove_wait_queue(&sdev->trace_sleep, &wait);

	return sof_trace_avail(sdev, pos, buffer_size);
}

static ssize_t sof_dfsentry_trace_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;
	unsigned long rem;
	loff_t lpos = *ppos;
	size_t avail, buffer_size = dfse->size;
	u64 lpos_64;

	/* make sure we know about any failures on the DSP side */
	sdev->dtrace_error = false;

	/* check pos and count */
	if (lpos < 0)
		return -EINVAL;
	if (!count)
		return 0;

	/* check for buffer wrap and count overflow */
	lpos_64 = lpos;
	lpos = do_div(lpos_64, buffer_size);

	if (count > buffer_size - lpos) /* min() not used to avoid sparse warnings */
		count = buffer_size - lpos;

	/* get available count based on current host offset */
	avail = sof_wait_trace_avail(sdev, lpos, buffer_size);
	if (sdev->dtrace_error) {
		dev_err(sdev->dev, "error: trace IO error\n");
		return -EIO;
	}

	/* make sure count is <= avail */
	count = avail > count ? count : avail;

	/* copy available trace data to debugfs */
	rem = copy_to_user(buffer, ((u8 *)(dfse->buf) + lpos), count);
	if (rem)
		return -EFAULT;

	*ppos += count;

	/* move debugfs reading position */
	return count;
}

static int sof_dfsentry_trace_release(struct inode *inode, struct file *file)
{
	struct snd_sof_dfsentry *dfse = inode->i_private;
	struct snd_sof_dev *sdev = dfse->sdev;

	/* avoid duplicate traces at next open */
	if (!sdev->dtrace_is_enabled)
		sdev->host_offset = 0;

	return 0;
}

static const struct file_operations sof_dfs_trace_fops = {
	.open = simple_open,
	.read = sof_dfsentry_trace_read,
	.llseek = default_llseek,
	.release = sof_dfsentry_trace_release,
};

static int trace_debugfs_create(struct snd_sof_dev *sdev)
{
	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 = sdev->dmatb.area;
	dfse->size = sdev->dmatb.bytes;
	dfse->sdev = sdev;

	dfse->dfsentry = debugfs_create_file("trace", 0444, sdev->debugfs_root,
					     dfse, &sof_dfs_trace_fops);
	if (!dfse->dfsentry) {
		/* can't rely on debugfs, only log error and keep going */
		dev_err(sdev->dev,
			"error: cannot create debugfs entry for trace\n");
	}

	return 0;
}

int snd_sof_init_trace_ipc(struct snd_sof_dev *sdev)
{
	struct sof_ipc_fw_ready *ready = &sdev->fw_ready;
	struct sof_ipc_fw_version *v = &ready->version;
	struct sof_ipc_dma_trace_params_ext params;
	struct sof_ipc_reply ipc_reply;
	int ret;

	if (sdev->dtrace_is_enabled || !sdev->dma_trace_pages)
		return -EINVAL;

	/* set IPC parameters */
	params.hdr.cmd = SOF_IPC_GLB_TRACE_MSG;
	/* PARAMS_EXT is only supported from ABI 3.7.0 onwards */
	if (v->abi_version >= SOF_ABI_VER(3, 7, 0)) {
		params.hdr.size = sizeof(struct sof_ipc_dma_trace_params_ext);
		params.hdr.cmd |= SOF_IPC_TRACE_DMA_PARAMS_EXT;
		params.timestamp_ns = ktime_get(); /* in nanosecond */
	} else {
		params.hdr.size = sizeof(struct sof_ipc_dma_trace_params);
		params.hdr.cmd |= SOF_IPC_TRACE_DMA_PARAMS;
	}
	params.buffer.phy_addr = sdev->dmatp.addr;
	params.buffer.size = sdev->dmatb.bytes;
	params.buffer.pages = sdev->dma_trace_pages;
	params.stream_tag = 0;

	sdev->host_offset = 0;
	sdev->dtrace_draining = false;

	ret = snd_sof_dma_trace_init(sdev, &params.stream_tag);
	if (ret < 0) {
		dev_err(sdev->dev,
			"error: fail in snd_sof_dma_trace_init %d\n", ret);
		return ret;
	}
	dev_dbg(sdev->dev, "stream_tag: %d\n", params.stream_tag);

	/* send IPC to the DSP */
	ret = sof_ipc_tx_message(sdev->ipc,
				 params.hdr.cmd, &params, sizeof(params),
				 &ipc_reply, sizeof(ipc_reply));
	if (ret < 0) {
		dev_err(sdev->dev,
			"error: can't set params for DMA for trace %d\n", ret);
		goto trace_release;
	}

	ret = snd_sof_dma_trace_trigger(sdev, SNDRV_PCM_TRIGGER_START);
	if (ret < 0) {
		dev_err(sdev->dev,
			"error: snd_sof_dma_trace_trigger: start: %d\n", ret);
		goto trace_release;
	}

	sdev->dtrace_is_enabled = true;

	return 0;

trace_release:
	snd_sof_dma_trace_release(sdev);
	return ret;
}

int snd_sof_init_trace(struct snd_sof_dev *sdev)
{
	int ret;

	/* set false before start initialization */
	sdev->dtrace_is_enabled = false;

	/* allocate trace page table buffer */
	ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, sdev->dev,
				  PAGE_SIZE, &sdev->dmatp);
	if (ret < 0) {
		dev_err(sdev->dev,
			"error: can't alloc page table for trace %d\n", ret);
		return ret;
	}

	/* allocate trace data buffer */
	ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV_SG, sdev->dev,
				  DMA_BUF_SIZE_FOR_TRACE, &sdev->dmatb);
	if (ret < 0) {
		dev_err(sdev->dev,
			"error: can't alloc buffer for trace %d\n", ret);
		goto page_err;
	}

	/* create compressed page table for audio firmware */
	ret = snd_sof_create_page_table(sdev, &sdev->dmatb, sdev->dmatp.area,
					sdev->dmatb.bytes);
	if (ret < 0)
		goto table_err;

	sdev->dma_trace_pages = ret;
	dev_dbg(sdev->dev, "dma_trace_pages: %d\n", sdev->dma_trace_pages);

	if (sdev->first_boot) {
		ret = trace_debugfs_create(sdev);
		if (ret < 0)
			goto table_err;
	}

	init_waitqueue_head(&sdev->trace_sleep);

	ret = snd_sof_init_trace_ipc(sdev);
	if (ret < 0)
		goto table_err;

	return 0;
table_err:
	sdev->dma_trace_pages = 0;
	snd_dma_free_pages(&sdev->dmatb);
page_err:
	snd_dma_free_pages(&sdev->dmatp);
	return ret;
}
EXPORT_SYMBOL(snd_sof_init_trace);

int snd_sof_trace_update_pos(struct snd_sof_dev *sdev,
			     struct sof_ipc_dma_trace_posn *posn)
{
	if (sdev->dtrace_is_enabled && sdev->host_offset != posn->host_offset) {
		sdev->host_offset = posn->host_offset;
		wake_up(&sdev->trace_sleep);
	}

	if (posn->overflow != 0)
		dev_err(sdev->dev,
			"error: DSP trace buffer overflow %u bytes. Total messages %d\n",
			posn->overflow, posn->messages);

	return 0;
}

/* an error has occurred within the DSP that prevents further trace */
void snd_sof_trace_notify_for_error(struct snd_sof_dev *sdev)
{
	if (sdev->dtrace_is_enabled) {
		dev_err(sdev->dev, "error: waking up any trace sleepers\n");
		sdev->dtrace_error = true;
		wake_up(&sdev->trace_sleep);
	}
}
EXPORT_SYMBOL(snd_sof_trace_notify_for_error);

void snd_sof_release_trace(struct snd_sof_dev *sdev)
{
	int ret;

	if (!sdev->dtrace_is_enabled)
		return;

	ret = snd_sof_dma_trace_trigger(sdev, SNDRV_PCM_TRIGGER_STOP);
	if (ret < 0)
		dev_err(sdev->dev,
			"error: snd_sof_dma_trace_trigger: stop: %d\n", ret);

	ret = snd_sof_dma_trace_release(sdev);
	if (ret < 0)
		dev_err(sdev->dev,
			"error: fail in snd_sof_dma_trace_release %d\n", ret);

	sdev->dtrace_is_enabled = false;
	sdev->dtrace_draining = true;
	wake_up(&sdev->trace_sleep);
}
EXPORT_SYMBOL(snd_sof_release_trace);

void snd_sof_free_trace(struct snd_sof_dev *sdev)
{
	snd_sof_release_trace(sdev);

	snd_dma_free_pages(&sdev->dmatb);
	snd_dma_free_pages(&sdev->dmatp);
}
EXPORT_SYMBOL(snd_sof_free_trace);