1 // SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
3 // This file is provided under a dual BSD/GPLv2 license. When using or
4 // redistributing this file, you may do so under either license.
6 // Copyright(c) 2018 Intel Corporation. All rights reserved.
8 // Author: Liam Girdwood <liam.r.girdwood@linux.intel.com>
11 #include <linux/debugfs.h>
12 #include <linux/sched/signal.h>
16 static size_t sof_trace_avail(struct snd_sof_dev *sdev,
17 loff_t pos, size_t buffer_size)
19 loff_t host_offset = READ_ONCE(sdev->host_offset);
22 * If host offset is less than local pos, it means write pointer of
23 * host DMA buffer has been wrapped. We should output the trace data
24 * at the end of host DMA buffer at first.
26 if (host_offset < pos)
27 return buffer_size - pos;
29 /* If there is available trace data now, it is unnecessary to wait. */
30 if (host_offset > pos)
31 return host_offset - pos;
36 static size_t sof_wait_trace_avail(struct snd_sof_dev *sdev,
37 loff_t pos, size_t buffer_size)
39 wait_queue_entry_t wait;
40 size_t ret = sof_trace_avail(sdev, pos, buffer_size);
42 /* data immediately available */
46 if (!sdev->dtrace_is_enabled && sdev->dtrace_draining) {
48 * tracing has ended and all traces have been
49 * read by client, return EOF
51 sdev->dtrace_draining = false;
55 /* wait for available trace data from FW */
56 init_waitqueue_entry(&wait, current);
57 set_current_state(TASK_INTERRUPTIBLE);
58 add_wait_queue(&sdev->trace_sleep, &wait);
60 if (!signal_pending(current)) {
61 /* set timeout to max value, no error code */
62 schedule_timeout(MAX_SCHEDULE_TIMEOUT);
64 remove_wait_queue(&sdev->trace_sleep, &wait);
66 return sof_trace_avail(sdev, pos, buffer_size);
69 static ssize_t sof_dfsentry_trace_read(struct file *file, char __user *buffer,
70 size_t count, loff_t *ppos)
72 struct snd_sof_dfsentry *dfse = file->private_data;
73 struct snd_sof_dev *sdev = dfse->sdev;
76 size_t avail, buffer_size = dfse->size;
79 /* make sure we know about any failures on the DSP side */
80 sdev->dtrace_error = false;
82 /* check pos and count */
88 /* check for buffer wrap and count overflow */
90 lpos = do_div(lpos_64, buffer_size);
92 if (count > buffer_size - lpos) /* min() not used to avoid sparse warnings */
93 count = buffer_size - lpos;
95 /* get available count based on current host offset */
96 avail = sof_wait_trace_avail(sdev, lpos, buffer_size);
97 if (sdev->dtrace_error) {
98 dev_err(sdev->dev, "error: trace IO error\n");
102 /* make sure count is <= avail */
103 count = avail > count ? count : avail;
105 /* copy available trace data to debugfs */
106 rem = copy_to_user(buffer, ((u8 *)(dfse->buf) + lpos), count);
112 /* move debugfs reading position */
116 static int sof_dfsentry_trace_release(struct inode *inode, struct file *file)
118 struct snd_sof_dfsentry *dfse = inode->i_private;
119 struct snd_sof_dev *sdev = dfse->sdev;
121 /* avoid duplicate traces at next open */
122 if (!sdev->dtrace_is_enabled)
123 sdev->host_offset = 0;
128 static const struct file_operations sof_dfs_trace_fops = {
130 .read = sof_dfsentry_trace_read,
131 .llseek = default_llseek,
132 .release = sof_dfsentry_trace_release,
135 static int trace_debugfs_create(struct snd_sof_dev *sdev)
137 struct snd_sof_dfsentry *dfse;
142 dfse = devm_kzalloc(sdev->dev, sizeof(*dfse), GFP_KERNEL);
146 dfse->type = SOF_DFSENTRY_TYPE_BUF;
147 dfse->buf = sdev->dmatb.area;
148 dfse->size = sdev->dmatb.bytes;
151 dfse->dfsentry = debugfs_create_file("trace", 0444, sdev->debugfs_root,
152 dfse, &sof_dfs_trace_fops);
153 if (!dfse->dfsentry) {
154 /* can't rely on debugfs, only log error and keep going */
156 "error: cannot create debugfs entry for trace\n");
162 int snd_sof_init_trace_ipc(struct snd_sof_dev *sdev)
164 struct sof_ipc_fw_ready *ready = &sdev->fw_ready;
165 struct sof_ipc_fw_version *v = &ready->version;
166 struct sof_ipc_dma_trace_params_ext params;
167 struct sof_ipc_reply ipc_reply;
170 if (sdev->dtrace_is_enabled || !sdev->dma_trace_pages)
173 /* set IPC parameters */
174 params.hdr.cmd = SOF_IPC_GLB_TRACE_MSG;
175 /* PARAMS_EXT is only supported from ABI 3.7.0 onwards */
176 if (v->abi_version >= SOF_ABI_VER(3, 7, 0)) {
177 params.hdr.size = sizeof(struct sof_ipc_dma_trace_params_ext);
178 params.hdr.cmd |= SOF_IPC_TRACE_DMA_PARAMS_EXT;
179 params.timestamp_ns = ktime_get(); /* in nanosecond */
181 params.hdr.size = sizeof(struct sof_ipc_dma_trace_params);
182 params.hdr.cmd |= SOF_IPC_TRACE_DMA_PARAMS;
184 params.buffer.phy_addr = sdev->dmatp.addr;
185 params.buffer.size = sdev->dmatb.bytes;
186 params.buffer.pages = sdev->dma_trace_pages;
187 params.stream_tag = 0;
189 sdev->host_offset = 0;
190 sdev->dtrace_draining = false;
192 ret = snd_sof_dma_trace_init(sdev, ¶ms.stream_tag);
195 "error: fail in snd_sof_dma_trace_init %d\n", ret);
198 dev_dbg(sdev->dev, "stream_tag: %d\n", params.stream_tag);
200 /* send IPC to the DSP */
201 ret = sof_ipc_tx_message(sdev->ipc,
202 params.hdr.cmd, ¶ms, sizeof(params),
203 &ipc_reply, sizeof(ipc_reply));
206 "error: can't set params for DMA for trace %d\n", ret);
210 ret = snd_sof_dma_trace_trigger(sdev, SNDRV_PCM_TRIGGER_START);
213 "error: snd_sof_dma_trace_trigger: start: %d\n", ret);
217 sdev->dtrace_is_enabled = true;
222 snd_sof_dma_trace_release(sdev);
226 int snd_sof_init_trace(struct snd_sof_dev *sdev)
230 /* set false before start initialization */
231 sdev->dtrace_is_enabled = false;
233 /* allocate trace page table buffer */
234 ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, sdev->dev,
235 PAGE_SIZE, &sdev->dmatp);
238 "error: can't alloc page table for trace %d\n", ret);
242 /* allocate trace data buffer */
243 ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV_SG, sdev->dev,
244 DMA_BUF_SIZE_FOR_TRACE, &sdev->dmatb);
247 "error: can't alloc buffer for trace %d\n", ret);
251 /* create compressed page table for audio firmware */
252 ret = snd_sof_create_page_table(sdev, &sdev->dmatb, sdev->dmatp.area,
257 sdev->dma_trace_pages = ret;
258 dev_dbg(sdev->dev, "dma_trace_pages: %d\n", sdev->dma_trace_pages);
260 if (sdev->first_boot) {
261 ret = trace_debugfs_create(sdev);
266 init_waitqueue_head(&sdev->trace_sleep);
268 ret = snd_sof_init_trace_ipc(sdev);
274 sdev->dma_trace_pages = 0;
275 snd_dma_free_pages(&sdev->dmatb);
277 snd_dma_free_pages(&sdev->dmatp);
280 EXPORT_SYMBOL(snd_sof_init_trace);
282 int snd_sof_trace_update_pos(struct snd_sof_dev *sdev,
283 struct sof_ipc_dma_trace_posn *posn)
285 if (sdev->dtrace_is_enabled && sdev->host_offset != posn->host_offset) {
286 sdev->host_offset = posn->host_offset;
287 wake_up(&sdev->trace_sleep);
290 if (posn->overflow != 0)
292 "error: DSP trace buffer overflow %u bytes. Total messages %d\n",
293 posn->overflow, posn->messages);
298 /* an error has occurred within the DSP that prevents further trace */
299 void snd_sof_trace_notify_for_error(struct snd_sof_dev *sdev)
301 if (sdev->dtrace_is_enabled) {
302 dev_err(sdev->dev, "error: waking up any trace sleepers\n");
303 sdev->dtrace_error = true;
304 wake_up(&sdev->trace_sleep);
307 EXPORT_SYMBOL(snd_sof_trace_notify_for_error);
309 void snd_sof_release_trace(struct snd_sof_dev *sdev)
313 if (!sdev->dtrace_is_enabled)
316 ret = snd_sof_dma_trace_trigger(sdev, SNDRV_PCM_TRIGGER_STOP);
319 "error: snd_sof_dma_trace_trigger: stop: %d\n", ret);
321 ret = snd_sof_dma_trace_release(sdev);
324 "error: fail in snd_sof_dma_trace_release %d\n", ret);
326 sdev->dtrace_is_enabled = false;
327 sdev->dtrace_draining = true;
328 wake_up(&sdev->trace_sleep);
330 EXPORT_SYMBOL(snd_sof_release_trace);
332 void snd_sof_free_trace(struct snd_sof_dev *sdev)
334 snd_sof_release_trace(sdev);
336 snd_dma_free_pages(&sdev->dmatb);
337 snd_dma_free_pages(&sdev->dmatp);
339 EXPORT_SYMBOL(snd_sof_free_trace);