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1// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
2//
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.
5//
6// Copyright(c) 2018 Intel Corporation. All rights reserved.
7//
8// Author: Liam Girdwood <liam.r.girdwood@linux.intel.com>
9//
10
11#include <linux/debugfs.h>
12#include <linux/sched/signal.h>
13#include "sof-priv.h"
14#include "ops.h"
15
16static size_t sof_trace_avail(struct snd_sof_dev *sdev,
17 loff_t pos, size_t buffer_size)
18{
19 loff_t host_offset = READ_ONCE(sdev->host_offset);
20
21 /*
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.
25 */
26 if (host_offset < pos)
27 return buffer_size - pos;
28
29 /* If there is available trace data now, it is unnecessary to wait. */
30 if (host_offset > pos)
31 return host_offset - pos;
32
33 return 0;
34}
35
36static size_t sof_wait_trace_avail(struct snd_sof_dev *sdev,
37 loff_t pos, size_t buffer_size)
38{
39 wait_queue_entry_t wait;
40 size_t ret = sof_trace_avail(sdev, pos, buffer_size);
41
42 /* data immediately available */
43 if (ret)
44 return ret;
45
46 if (!sdev->dtrace_is_enabled && sdev->dtrace_draining) {
47 /*
48 * tracing has ended and all traces have been
49 * read by client, return EOF
50 */
51 sdev->dtrace_draining = false;
52 return 0;
53 }
54
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);
59
60 if (!signal_pending(current)) {
61 /* set timeout to max value, no error code */
62 schedule_timeout(MAX_SCHEDULE_TIMEOUT);
63 }
64 remove_wait_queue(&sdev->trace_sleep, &wait);
65
66 return sof_trace_avail(sdev, pos, buffer_size);
67}
68
69static ssize_t sof_dfsentry_trace_read(struct file *file, char __user *buffer,
70 size_t count, loff_t *ppos)
71{
72 struct snd_sof_dfsentry *dfse = file->private_data;
73 struct snd_sof_dev *sdev = dfse->sdev;
74 unsigned long rem;
75 loff_t lpos = *ppos;
76 size_t avail, buffer_size = dfse->size;
77 u64 lpos_64;
78
79 /* make sure we know about any failures on the DSP side */
80 sdev->dtrace_error = false;
81
82 /* check pos and count */
83 if (lpos < 0)
84 return -EINVAL;
85 if (!count)
86 return 0;
87
88 /* check for buffer wrap and count overflow */
89 lpos_64 = lpos;
90 lpos = do_div(lpos_64, buffer_size);
91
92 if (count > buffer_size - lpos) /* min() not used to avoid sparse warnings */
93 count = buffer_size - lpos;
94
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");
99 return -EIO;
100 }
101
102 /* make sure count is <= avail */
103 count = avail > count ? count : avail;
104
105 /* copy available trace data to debugfs */
106 rem = copy_to_user(buffer, ((u8 *)(dfse->buf) + lpos), count);
107 if (rem)
108 return -EFAULT;
109
110 *ppos += count;
111
112 /* move debugfs reading position */
113 return count;
114}
115
116static int sof_dfsentry_trace_release(struct inode *inode, struct file *file)
117{
118 struct snd_sof_dfsentry *dfse = inode->i_private;
119 struct snd_sof_dev *sdev = dfse->sdev;
120
121 /* avoid duplicate traces at next open */
122 if (!sdev->dtrace_is_enabled)
123 sdev->host_offset = 0;
124
125 return 0;
126}
127
128static const struct file_operations sof_dfs_trace_fops = {
129 .open = simple_open,
130 .read = sof_dfsentry_trace_read,
131 .llseek = default_llseek,
132 .release = sof_dfsentry_trace_release,
133};
134
135static int trace_debugfs_create(struct snd_sof_dev *sdev)
136{
137 struct snd_sof_dfsentry *dfse;
138
139 if (!sdev)
140 return -EINVAL;
141
142 dfse = devm_kzalloc(sdev->dev, sizeof(*dfse), GFP_KERNEL);
143 if (!dfse)
144 return -ENOMEM;
145
146 dfse->type = SOF_DFSENTRY_TYPE_BUF;
147 dfse->buf = sdev->dmatb.area;
148 dfse->size = sdev->dmatb.bytes;
149 dfse->sdev = sdev;
150
151 debugfs_create_file("trace", 0444, sdev->debugfs_root, dfse,
152 &sof_dfs_trace_fops);
153
154 return 0;
155}
156
157int snd_sof_init_trace_ipc(struct snd_sof_dev *sdev)
158{
159 struct sof_ipc_fw_ready *ready = &sdev->fw_ready;
160 struct sof_ipc_fw_version *v = &ready->version;
161 struct sof_ipc_dma_trace_params_ext params;
162 struct sof_ipc_reply ipc_reply;
163 int ret;
164
165 if (sdev->dtrace_is_enabled || !sdev->dma_trace_pages)
166 return -EINVAL;
167
168 /* set IPC parameters */
169 params.hdr.cmd = SOF_IPC_GLB_TRACE_MSG;
170 /* PARAMS_EXT is only supported from ABI 3.7.0 onwards */
171 if (v->abi_version >= SOF_ABI_VER(3, 7, 0)) {
172 params.hdr.size = sizeof(struct sof_ipc_dma_trace_params_ext);
173 params.hdr.cmd |= SOF_IPC_TRACE_DMA_PARAMS_EXT;
174 params.timestamp_ns = ktime_get(); /* in nanosecond */
175 } else {
176 params.hdr.size = sizeof(struct sof_ipc_dma_trace_params);
177 params.hdr.cmd |= SOF_IPC_TRACE_DMA_PARAMS;
178 }
179 params.buffer.phy_addr = sdev->dmatp.addr;
180 params.buffer.size = sdev->dmatb.bytes;
181 params.buffer.pages = sdev->dma_trace_pages;
182 params.stream_tag = 0;
183
184 sdev->host_offset = 0;
185 sdev->dtrace_draining = false;
186
187 ret = snd_sof_dma_trace_init(sdev, ¶ms.stream_tag);
188 if (ret < 0) {
189 dev_err(sdev->dev,
190 "error: fail in snd_sof_dma_trace_init %d\n", ret);
191 return ret;
192 }
193 dev_dbg(sdev->dev, "stream_tag: %d\n", params.stream_tag);
194
195 /* send IPC to the DSP */
196 ret = sof_ipc_tx_message(sdev->ipc,
197 params.hdr.cmd, ¶ms, sizeof(params),
198 &ipc_reply, sizeof(ipc_reply));
199 if (ret < 0) {
200 dev_err(sdev->dev,
201 "error: can't set params for DMA for trace %d\n", ret);
202 goto trace_release;
203 }
204
205 ret = snd_sof_dma_trace_trigger(sdev, SNDRV_PCM_TRIGGER_START);
206 if (ret < 0) {
207 dev_err(sdev->dev,
208 "error: snd_sof_dma_trace_trigger: start: %d\n", ret);
209 goto trace_release;
210 }
211
212 sdev->dtrace_is_enabled = true;
213
214 return 0;
215
216trace_release:
217 snd_sof_dma_trace_release(sdev);
218 return ret;
219}
220
221int snd_sof_init_trace(struct snd_sof_dev *sdev)
222{
223 int ret;
224
225 /* set false before start initialization */
226 sdev->dtrace_is_enabled = false;
227
228 /* allocate trace page table buffer */
229 ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, sdev->dev,
230 PAGE_SIZE, &sdev->dmatp);
231 if (ret < 0) {
232 dev_err(sdev->dev,
233 "error: can't alloc page table for trace %d\n", ret);
234 return ret;
235 }
236
237 /* allocate trace data buffer */
238 ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV_SG, sdev->dev,
239 DMA_BUF_SIZE_FOR_TRACE, &sdev->dmatb);
240 if (ret < 0) {
241 dev_err(sdev->dev,
242 "error: can't alloc buffer for trace %d\n", ret);
243 goto page_err;
244 }
245
246 /* create compressed page table for audio firmware */
247 ret = snd_sof_create_page_table(sdev, &sdev->dmatb, sdev->dmatp.area,
248 sdev->dmatb.bytes);
249 if (ret < 0)
250 goto table_err;
251
252 sdev->dma_trace_pages = ret;
253 dev_dbg(sdev->dev, "dma_trace_pages: %d\n", sdev->dma_trace_pages);
254
255 if (sdev->first_boot) {
256 ret = trace_debugfs_create(sdev);
257 if (ret < 0)
258 goto table_err;
259 }
260
261 init_waitqueue_head(&sdev->trace_sleep);
262
263 ret = snd_sof_init_trace_ipc(sdev);
264 if (ret < 0)
265 goto table_err;
266
267 return 0;
268table_err:
269 sdev->dma_trace_pages = 0;
270 snd_dma_free_pages(&sdev->dmatb);
271page_err:
272 snd_dma_free_pages(&sdev->dmatp);
273 return ret;
274}
275EXPORT_SYMBOL(snd_sof_init_trace);
276
277int snd_sof_trace_update_pos(struct snd_sof_dev *sdev,
278 struct sof_ipc_dma_trace_posn *posn)
279{
280 if (sdev->dtrace_is_enabled && sdev->host_offset != posn->host_offset) {
281 sdev->host_offset = posn->host_offset;
282 wake_up(&sdev->trace_sleep);
283 }
284
285 if (posn->overflow != 0)
286 dev_err(sdev->dev,
287 "error: DSP trace buffer overflow %u bytes. Total messages %d\n",
288 posn->overflow, posn->messages);
289
290 return 0;
291}
292
293/* an error has occurred within the DSP that prevents further trace */
294void snd_sof_trace_notify_for_error(struct snd_sof_dev *sdev)
295{
296 if (sdev->dtrace_is_enabled) {
297 dev_err(sdev->dev, "error: waking up any trace sleepers\n");
298 sdev->dtrace_error = true;
299 wake_up(&sdev->trace_sleep);
300 }
301}
302EXPORT_SYMBOL(snd_sof_trace_notify_for_error);
303
304void snd_sof_release_trace(struct snd_sof_dev *sdev)
305{
306 int ret;
307
308 if (!sdev->dtrace_is_enabled)
309 return;
310
311 ret = snd_sof_dma_trace_trigger(sdev, SNDRV_PCM_TRIGGER_STOP);
312 if (ret < 0)
313 dev_err(sdev->dev,
314 "error: snd_sof_dma_trace_trigger: stop: %d\n", ret);
315
316 ret = snd_sof_dma_trace_release(sdev);
317 if (ret < 0)
318 dev_err(sdev->dev,
319 "error: fail in snd_sof_dma_trace_release %d\n", ret);
320
321 sdev->dtrace_is_enabled = false;
322 sdev->dtrace_draining = true;
323 wake_up(&sdev->trace_sleep);
324}
325EXPORT_SYMBOL(snd_sof_release_trace);
326
327void snd_sof_free_trace(struct snd_sof_dev *sdev)
328{
329 snd_sof_release_trace(sdev);
330
331 snd_dma_free_pages(&sdev->dmatb);
332 snd_dma_free_pages(&sdev->dmatp);
333}
334EXPORT_SYMBOL(snd_sof_free_trace);