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_wait_trace_avail(struct snd_sof_dev *sdev,
17 loff_t pos, size_t buffer_size)
19 wait_queue_entry_t wait;
20 loff_t host_offset = READ_ONCE(sdev->host_offset);
23 * If host offset is less than local pos, it means write pointer of
24 * host DMA buffer has been wrapped. We should output the trace data
25 * at the end of host DMA buffer at first.
27 if (host_offset < pos)
28 return buffer_size - pos;
30 /* If there is available trace data now, it is unnecessary to wait. */
31 if (host_offset > pos)
32 return host_offset - pos;
34 /* wait for available trace data from FW */
35 init_waitqueue_entry(&wait, current);
36 set_current_state(TASK_INTERRUPTIBLE);
37 add_wait_queue(&sdev->trace_sleep, &wait);
39 if (!signal_pending(current)) {
40 /* set timeout to max value, no error code */
41 schedule_timeout(MAX_SCHEDULE_TIMEOUT);
43 remove_wait_queue(&sdev->trace_sleep, &wait);
45 /* return bytes available for copy */
46 host_offset = READ_ONCE(sdev->host_offset);
47 if (host_offset < pos)
48 return buffer_size - pos;
50 return host_offset - pos;
53 static ssize_t sof_dfsentry_trace_read(struct file *file, char __user *buffer,
54 size_t count, loff_t *ppos)
56 struct snd_sof_dfsentry *dfse = file->private_data;
57 struct snd_sof_dev *sdev = dfse->sdev;
60 size_t avail, buffer_size = dfse->size;
63 /* make sure we know about any failures on the DSP side */
64 sdev->dtrace_error = false;
66 /* check pos and count */
72 /* check for buffer wrap and count overflow */
74 lpos = do_div(lpos_64, buffer_size);
76 if (count > buffer_size - lpos) /* min() not used to avoid sparse warnings */
77 count = buffer_size - lpos;
79 /* get available count based on current host offset */
80 avail = sof_wait_trace_avail(sdev, lpos, buffer_size);
81 if (sdev->dtrace_error) {
82 dev_err(sdev->dev, "error: trace IO error\n");
86 /* make sure count is <= avail */
87 count = avail > count ? count : avail;
89 /* copy available trace data to debugfs */
90 rem = copy_to_user(buffer, ((u8 *)(dfse->buf) + lpos), count);
96 /* move debugfs reading position */
100 static const struct file_operations sof_dfs_trace_fops = {
102 .read = sof_dfsentry_trace_read,
103 .llseek = default_llseek,
106 static int trace_debugfs_create(struct snd_sof_dev *sdev)
108 struct snd_sof_dfsentry *dfse;
113 dfse = devm_kzalloc(sdev->dev, sizeof(*dfse), GFP_KERNEL);
117 dfse->type = SOF_DFSENTRY_TYPE_BUF;
118 dfse->buf = sdev->dmatb.area;
119 dfse->size = sdev->dmatb.bytes;
122 dfse->dfsentry = debugfs_create_file("trace", 0444, sdev->debugfs_root,
123 dfse, &sof_dfs_trace_fops);
124 if (!dfse->dfsentry) {
125 /* can't rely on debugfs, only log error and keep going */
127 "error: cannot create debugfs entry for trace\n");
133 int snd_sof_init_trace_ipc(struct snd_sof_dev *sdev)
135 struct sof_ipc_dma_trace_params params;
136 struct sof_ipc_reply ipc_reply;
139 if (sdev->dtrace_is_enabled || !sdev->dma_trace_pages)
142 /* set IPC parameters */
143 params.hdr.size = sizeof(params);
144 params.hdr.cmd = SOF_IPC_GLB_TRACE_MSG | SOF_IPC_TRACE_DMA_PARAMS;
145 params.buffer.phy_addr = sdev->dmatp.addr;
146 params.buffer.size = sdev->dmatb.bytes;
147 params.buffer.pages = sdev->dma_trace_pages;
148 params.stream_tag = 0;
150 sdev->host_offset = 0;
152 ret = snd_sof_dma_trace_init(sdev, ¶ms.stream_tag);
155 "error: fail in snd_sof_dma_trace_init %d\n", ret);
158 dev_dbg(sdev->dev, "stream_tag: %d\n", params.stream_tag);
160 /* send IPC to the DSP */
161 ret = sof_ipc_tx_message(sdev->ipc,
162 params.hdr.cmd, ¶ms, sizeof(params),
163 &ipc_reply, sizeof(ipc_reply));
166 "error: can't set params for DMA for trace %d\n", ret);
170 ret = snd_sof_dma_trace_trigger(sdev, SNDRV_PCM_TRIGGER_START);
173 "error: snd_sof_dma_trace_trigger: start: %d\n", ret);
177 sdev->dtrace_is_enabled = true;
182 snd_sof_dma_trace_release(sdev);
186 int snd_sof_init_trace(struct snd_sof_dev *sdev)
190 /* set false before start initialization */
191 sdev->dtrace_is_enabled = false;
193 /* allocate trace page table buffer */
194 ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, sdev->dev,
195 PAGE_SIZE, &sdev->dmatp);
198 "error: can't alloc page table for trace %d\n", ret);
202 /* allocate trace data buffer */
203 ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV_SG, sdev->dev,
204 DMA_BUF_SIZE_FOR_TRACE, &sdev->dmatb);
207 "error: can't alloc buffer for trace %d\n", ret);
211 /* create compressed page table for audio firmware */
212 ret = snd_sof_create_page_table(sdev, &sdev->dmatb, sdev->dmatp.area,
217 sdev->dma_trace_pages = ret;
218 dev_dbg(sdev->dev, "dma_trace_pages: %d\n", sdev->dma_trace_pages);
220 if (sdev->first_boot) {
221 ret = trace_debugfs_create(sdev);
226 init_waitqueue_head(&sdev->trace_sleep);
228 ret = snd_sof_init_trace_ipc(sdev);
234 sdev->dma_trace_pages = 0;
235 snd_dma_free_pages(&sdev->dmatb);
237 snd_dma_free_pages(&sdev->dmatp);
240 EXPORT_SYMBOL(snd_sof_init_trace);
242 int snd_sof_trace_update_pos(struct snd_sof_dev *sdev,
243 struct sof_ipc_dma_trace_posn *posn)
245 if (sdev->dtrace_is_enabled && sdev->host_offset != posn->host_offset) {
246 sdev->host_offset = posn->host_offset;
247 wake_up(&sdev->trace_sleep);
250 if (posn->overflow != 0)
252 "error: DSP trace buffer overflow %u bytes. Total messages %d\n",
253 posn->overflow, posn->messages);
258 /* an error has occurred within the DSP that prevents further trace */
259 void snd_sof_trace_notify_for_error(struct snd_sof_dev *sdev)
261 if (sdev->dtrace_is_enabled) {
262 dev_err(sdev->dev, "error: waking up any trace sleepers\n");
263 sdev->dtrace_error = true;
264 wake_up(&sdev->trace_sleep);
267 EXPORT_SYMBOL(snd_sof_trace_notify_for_error);
269 void snd_sof_release_trace(struct snd_sof_dev *sdev)
273 if (!sdev->dtrace_is_enabled)
276 ret = snd_sof_dma_trace_trigger(sdev, SNDRV_PCM_TRIGGER_STOP);
279 "error: snd_sof_dma_trace_trigger: stop: %d\n", ret);
281 ret = snd_sof_dma_trace_release(sdev);
284 "error: fail in snd_sof_dma_trace_release %d\n", ret);
286 sdev->dtrace_is_enabled = false;
288 EXPORT_SYMBOL(snd_sof_release_trace);
290 void snd_sof_free_trace(struct snd_sof_dev *sdev)
292 snd_sof_release_trace(sdev);
294 snd_dma_free_pages(&sdev->dmatb);
295 snd_dma_free_pages(&sdev->dmatp);
297 EXPORT_SYMBOL(snd_sof_free_trace);