linuxdebug/sound/soc/sof/ipc3-dtrace.c

676 lines
17 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
//
// Copyright(c) 2022 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 "sof-audio.h"
#include "ops.h"
#include "sof-utils.h"
#include "ipc3-priv.h"
#define TRACE_FILTER_ELEMENTS_PER_ENTRY 4
#define TRACE_FILTER_MAX_CONFIG_STRING_LENGTH 1024
enum sof_dtrace_state {
SOF_DTRACE_DISABLED,
SOF_DTRACE_STOPPED,
SOF_DTRACE_INITIALIZING,
SOF_DTRACE_ENABLED,
};
struct sof_dtrace_priv {
struct snd_dma_buffer dmatb;
struct snd_dma_buffer dmatp;
int dma_trace_pages;
wait_queue_head_t trace_sleep;
u32 host_offset;
bool dtrace_error;
bool dtrace_draining;
enum sof_dtrace_state dtrace_state;
};
static bool trace_pos_update_expected(struct sof_dtrace_priv *priv)
{
if (priv->dtrace_state == SOF_DTRACE_ENABLED ||
priv->dtrace_state == SOF_DTRACE_INITIALIZING)
return true;
return false;
}
static int trace_filter_append_elem(struct snd_sof_dev *sdev, u32 key, u32 value,
struct sof_ipc_trace_filter_elem *elem_list,
int capacity, int *counter)
{
if (*counter >= capacity)
return -ENOMEM;
elem_list[*counter].key = key;
elem_list[*counter].value = value;
++*counter;
return 0;
}
static int trace_filter_parse_entry(struct snd_sof_dev *sdev, const char *line,
struct sof_ipc_trace_filter_elem *elem,
int capacity, int *counter)
{
int log_level, pipe_id, comp_id, read, ret;
int len = strlen(line);
int cnt = *counter;
u32 uuid_id;
/* ignore empty content */
ret = sscanf(line, " %n", &read);
if (!ret && read == len)
return len;
ret = sscanf(line, " %d %x %d %d %n", &log_level, &uuid_id, &pipe_id, &comp_id, &read);
if (ret != TRACE_FILTER_ELEMENTS_PER_ENTRY || read != len) {
dev_err(sdev->dev, "Invalid trace filter entry '%s'\n", line);
return -EINVAL;
}
if (uuid_id > 0) {
ret = trace_filter_append_elem(sdev, SOF_IPC_TRACE_FILTER_ELEM_BY_UUID,
uuid_id, elem, capacity, &cnt);
if (ret)
return ret;
}
if (pipe_id >= 0) {
ret = trace_filter_append_elem(sdev, SOF_IPC_TRACE_FILTER_ELEM_BY_PIPE,
pipe_id, elem, capacity, &cnt);
if (ret)
return ret;
}
if (comp_id >= 0) {
ret = trace_filter_append_elem(sdev, SOF_IPC_TRACE_FILTER_ELEM_BY_COMP,
comp_id, elem, capacity, &cnt);
if (ret)
return ret;
}
ret = trace_filter_append_elem(sdev, SOF_IPC_TRACE_FILTER_ELEM_SET_LEVEL |
SOF_IPC_TRACE_FILTER_ELEM_FIN,
log_level, elem, capacity, &cnt);
if (ret)
return ret;
/* update counter only when parsing whole entry passed */
*counter = cnt;
return len;
}
static int trace_filter_parse(struct snd_sof_dev *sdev, char *string,
int *out_elem_cnt,
struct sof_ipc_trace_filter_elem **out)
{
static const char entry_delimiter[] = ";";
char *entry = string;
int capacity = 0;
int entry_len;
int cnt = 0;
/*
* Each entry contains at least 1, up to TRACE_FILTER_ELEMENTS_PER_ENTRY
* IPC elements, depending on content. Calculate IPC elements capacity
* for the input string where each element is set.
*/
while (entry) {
capacity += TRACE_FILTER_ELEMENTS_PER_ENTRY;
entry = strchr(entry + 1, entry_delimiter[0]);
}
*out = kmalloc(capacity * sizeof(**out), GFP_KERNEL);
if (!*out)
return -ENOMEM;
/* split input string by ';', and parse each entry separately in trace_filter_parse_entry */
while ((entry = strsep(&string, entry_delimiter))) {
entry_len = trace_filter_parse_entry(sdev, entry, *out, capacity, &cnt);
if (entry_len < 0) {
dev_err(sdev->dev,
"Parsing filter entry '%s' failed with %d\n",
entry, entry_len);
return -EINVAL;
}
}
*out_elem_cnt = cnt;
return 0;
}
static int ipc3_trace_update_filter(struct snd_sof_dev *sdev, int num_elems,
struct sof_ipc_trace_filter_elem *elems)
{
struct sof_ipc_trace_filter *msg;
struct sof_ipc_reply reply;
size_t size;
int ret;
size = struct_size(msg, elems, num_elems);
if (size > SOF_IPC_MSG_MAX_SIZE)
return -EINVAL;
msg = kmalloc(size, GFP_KERNEL);
if (!msg)
return -ENOMEM;
msg->hdr.size = size;
msg->hdr.cmd = SOF_IPC_GLB_TRACE_MSG | SOF_IPC_TRACE_FILTER_UPDATE;
msg->elem_cnt = num_elems;
memcpy(&msg->elems[0], elems, num_elems * sizeof(*elems));
ret = pm_runtime_resume_and_get(sdev->dev);
if (ret < 0 && ret != -EACCES) {
dev_err(sdev->dev, "enabling device failed: %d\n", ret);
goto error;
}
ret = sof_ipc_tx_message(sdev->ipc, msg, msg->hdr.size, &reply, sizeof(reply));
pm_runtime_mark_last_busy(sdev->dev);
pm_runtime_put_autosuspend(sdev->dev);
error:
kfree(msg);
return ret ? ret : reply.error;
}
static ssize_t dfsentry_trace_filter_write(struct file *file, const char __user *from,
size_t count, loff_t *ppos)
{
struct snd_sof_dfsentry *dfse = file->private_data;
struct sof_ipc_trace_filter_elem *elems = NULL;
struct snd_sof_dev *sdev = dfse->sdev;
int num_elems;
char *string;
int ret;
if (count > TRACE_FILTER_MAX_CONFIG_STRING_LENGTH) {
dev_err(sdev->dev, "%s too long input, %zu > %d\n", __func__, count,
TRACE_FILTER_MAX_CONFIG_STRING_LENGTH);
return -EINVAL;
}
string = kmalloc(count + 1, GFP_KERNEL);
if (!string)
return -ENOMEM;
if (copy_from_user(string, from, count)) {
ret = -EFAULT;
goto error;
}
string[count] = '\0';
ret = trace_filter_parse(sdev, string, &num_elems, &elems);
if (ret < 0)
goto error;
if (num_elems) {
ret = ipc3_trace_update_filter(sdev, num_elems, elems);
if (ret < 0) {
dev_err(sdev->dev, "Filter update failed: %d\n", ret);
goto error;
}
}
ret = count;
error:
kfree(string);
kfree(elems);
return ret;
}
static const struct file_operations sof_dfs_trace_filter_fops = {
.open = simple_open,
.write = dfsentry_trace_filter_write,
.llseek = default_llseek,
};
static int debugfs_create_trace_filter(struct snd_sof_dev *sdev)
{
struct snd_sof_dfsentry *dfse;
dfse = devm_kzalloc(sdev->dev, sizeof(*dfse), GFP_KERNEL);
if (!dfse)
return -ENOMEM;
dfse->sdev = sdev;
dfse->type = SOF_DFSENTRY_TYPE_BUF;
debugfs_create_file("filter", 0200, sdev->debugfs_root, dfse,
&sof_dfs_trace_filter_fops);
/* add to dfsentry list */
list_add(&dfse->list, &sdev->dfsentry_list);
return 0;
}
static bool sof_dtrace_set_host_offset(struct sof_dtrace_priv *priv, u32 new_offset)
{
u32 host_offset = READ_ONCE(priv->host_offset);
if (host_offset != new_offset) {
/* This is a bit paranoid and unlikely that it is needed */
u32 ret = cmpxchg(&priv->host_offset, host_offset, new_offset);
if (ret == host_offset)
return true;
}
return false;
}
static size_t sof_dtrace_avail(struct snd_sof_dev *sdev,
loff_t pos, size_t buffer_size)
{
struct sof_dtrace_priv *priv = sdev->fw_trace_data;
loff_t host_offset = READ_ONCE(priv->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_dtrace_avail(struct snd_sof_dev *sdev, loff_t pos,
size_t buffer_size)
{
size_t ret = sof_dtrace_avail(sdev, pos, buffer_size);
struct sof_dtrace_priv *priv = sdev->fw_trace_data;
wait_queue_entry_t wait;
/* data immediately available */
if (ret)
return ret;
if (priv->dtrace_draining && !trace_pos_update_expected(priv)) {
/*
* tracing has ended and all traces have been
* read by client, return EOF
*/
priv->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(&priv->trace_sleep, &wait);
if (!signal_pending(current)) {
/* set timeout to max value, no error code */
schedule_timeout(MAX_SCHEDULE_TIMEOUT);
}
remove_wait_queue(&priv->trace_sleep, &wait);
return sof_dtrace_avail(sdev, pos, buffer_size);
}
static ssize_t dfsentry_dtrace_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;
struct sof_dtrace_priv *priv = sdev->fw_trace_data;
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 */
priv->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);
/* get available count based on current host offset */
avail = sof_wait_dtrace_avail(sdev, lpos, buffer_size);
if (priv->dtrace_error) {
dev_err(sdev->dev, "trace IO error\n");
return -EIO;
}
/* no new trace data */
if (!avail)
return 0;
/* make sure count is <= avail */
if (count > avail)
count = avail;
/*
* make sure that all trace data is available for the CPU as the trace
* data buffer might be allocated from non consistent memory.
* Note: snd_dma_buffer_sync() is called for normal audio playback and
* capture streams also.
*/
snd_dma_buffer_sync(&priv->dmatb, SNDRV_DMA_SYNC_CPU);
/* 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 dfsentry_dtrace_release(struct inode *inode, struct file *file)
{
struct snd_sof_dfsentry *dfse = inode->i_private;
struct snd_sof_dev *sdev = dfse->sdev;
struct sof_dtrace_priv *priv = sdev->fw_trace_data;
/* avoid duplicate traces at next open */
if (priv->dtrace_state != SOF_DTRACE_ENABLED)
sof_dtrace_set_host_offset(priv, 0);
return 0;
}
static const struct file_operations sof_dfs_dtrace_fops = {
.open = simple_open,
.read = dfsentry_dtrace_read,
.llseek = default_llseek,
.release = dfsentry_dtrace_release,
};
static int debugfs_create_dtrace(struct snd_sof_dev *sdev)
{
struct sof_dtrace_priv *priv;
struct snd_sof_dfsentry *dfse;
int ret;
if (!sdev)
return -EINVAL;
priv = sdev->fw_trace_data;
ret = debugfs_create_trace_filter(sdev);
if (ret < 0)
dev_warn(sdev->dev, "failed to create filter debugfs file: %d", ret);
dfse = devm_kzalloc(sdev->dev, sizeof(*dfse), GFP_KERNEL);
if (!dfse)
return -ENOMEM;
dfse->type = SOF_DFSENTRY_TYPE_BUF;
dfse->buf = priv->dmatb.area;
dfse->size = priv->dmatb.bytes;
dfse->sdev = sdev;
debugfs_create_file("trace", 0444, sdev->debugfs_root, dfse,
&sof_dfs_dtrace_fops);
return 0;
}
static int ipc3_dtrace_enable(struct snd_sof_dev *sdev)
{
struct sof_dtrace_priv *priv = sdev->fw_trace_data;
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->fw_trace_is_supported)
return 0;
if (priv->dtrace_state == SOF_DTRACE_ENABLED || !priv->dma_trace_pages)
return -EINVAL;
if (priv->dtrace_state == SOF_DTRACE_STOPPED)
goto start;
/* 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 = priv->dmatp.addr;
params.buffer.size = priv->dmatb.bytes;
params.buffer.pages = priv->dma_trace_pages;
params.stream_tag = 0;
sof_dtrace_set_host_offset(priv, 0);
priv->dtrace_draining = false;
ret = sof_dtrace_host_init(sdev, &priv->dmatb, &params);
if (ret < 0) {
dev_err(sdev->dev, "Host dtrace init failed: %d\n", ret);
return ret;
}
dev_dbg(sdev->dev, "stream_tag: %d\n", params.stream_tag);
/* send IPC to the DSP */
priv->dtrace_state = SOF_DTRACE_INITIALIZING;
ret = sof_ipc_tx_message(sdev->ipc, &params, sizeof(params), &ipc_reply, sizeof(ipc_reply));
if (ret < 0) {
dev_err(sdev->dev, "can't set params for DMA for trace %d\n", ret);
goto trace_release;
}
start:
priv->dtrace_state = SOF_DTRACE_ENABLED;
ret = sof_dtrace_host_trigger(sdev, SNDRV_PCM_TRIGGER_START);
if (ret < 0) {
dev_err(sdev->dev, "Host dtrace trigger start failed: %d\n", ret);
goto trace_release;
}
return 0;
trace_release:
priv->dtrace_state = SOF_DTRACE_DISABLED;
sof_dtrace_host_release(sdev);
return ret;
}
static int ipc3_dtrace_init(struct snd_sof_dev *sdev)
{
struct sof_dtrace_priv *priv;
int ret;
/* dtrace is only supported with SOF_IPC */
if (sdev->pdata->ipc_type != SOF_IPC)
return -EOPNOTSUPP;
if (sdev->fw_trace_data) {
dev_err(sdev->dev, "fw_trace_data has been already allocated\n");
return -EBUSY;
}
priv = devm_kzalloc(sdev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
sdev->fw_trace_data = priv;
/* set false before start initialization */
priv->dtrace_state = SOF_DTRACE_DISABLED;
/* allocate trace page table buffer */
ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, sdev->dev,
PAGE_SIZE, &priv->dmatp);
if (ret < 0) {
dev_err(sdev->dev, "can't alloc page table for trace %d\n", ret);
return ret;
}
/* allocate trace data buffer */
ret = snd_dma_alloc_dir_pages(SNDRV_DMA_TYPE_DEV_SG, sdev->dev,
DMA_FROM_DEVICE, DMA_BUF_SIZE_FOR_TRACE,
&priv->dmatb);
if (ret < 0) {
dev_err(sdev->dev, "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->dev, &priv->dmatb,
priv->dmatp.area, priv->dmatb.bytes);
if (ret < 0)
goto table_err;
priv->dma_trace_pages = ret;
dev_dbg(sdev->dev, "dma_trace_pages: %d\n", priv->dma_trace_pages);
if (sdev->first_boot) {
ret = debugfs_create_dtrace(sdev);
if (ret < 0)
goto table_err;
}
init_waitqueue_head(&priv->trace_sleep);
ret = ipc3_dtrace_enable(sdev);
if (ret < 0)
goto table_err;
return 0;
table_err:
priv->dma_trace_pages = 0;
snd_dma_free_pages(&priv->dmatb);
page_err:
snd_dma_free_pages(&priv->dmatp);
return ret;
}
int ipc3_dtrace_posn_update(struct snd_sof_dev *sdev,
struct sof_ipc_dma_trace_posn *posn)
{
struct sof_dtrace_priv *priv = sdev->fw_trace_data;
if (!sdev->fw_trace_is_supported)
return 0;
if (trace_pos_update_expected(priv) &&
sof_dtrace_set_host_offset(priv, posn->host_offset))
wake_up(&priv->trace_sleep);
if (posn->overflow != 0)
dev_err(sdev->dev,
"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 */
static void ipc3_dtrace_fw_crashed(struct snd_sof_dev *sdev)
{
struct sof_dtrace_priv *priv = sdev->fw_trace_data;
if (priv->dtrace_state == SOF_DTRACE_ENABLED) {
priv->dtrace_error = true;
wake_up(&priv->trace_sleep);
}
}
static void ipc3_dtrace_release(struct snd_sof_dev *sdev, bool only_stop)
{
struct sof_dtrace_priv *priv = sdev->fw_trace_data;
struct sof_ipc_fw_ready *ready = &sdev->fw_ready;
struct sof_ipc_fw_version *v = &ready->version;
struct sof_ipc_cmd_hdr hdr;
struct sof_ipc_reply ipc_reply;
int ret;
if (!sdev->fw_trace_is_supported || priv->dtrace_state == SOF_DTRACE_DISABLED)
return;
ret = sof_dtrace_host_trigger(sdev, SNDRV_PCM_TRIGGER_STOP);
if (ret < 0)
dev_err(sdev->dev, "Host dtrace trigger stop failed: %d\n", ret);
priv->dtrace_state = SOF_DTRACE_STOPPED;
/*
* stop and free trace DMA in the DSP. TRACE_DMA_FREE is only supported from
* ABI 3.20.0 onwards
*/
if (v->abi_version >= SOF_ABI_VER(3, 20, 0)) {
hdr.size = sizeof(hdr);
hdr.cmd = SOF_IPC_GLB_TRACE_MSG | SOF_IPC_TRACE_DMA_FREE;
ret = sof_ipc_tx_message(sdev->ipc, &hdr, hdr.size,
&ipc_reply, sizeof(ipc_reply));
if (ret < 0)
dev_err(sdev->dev, "DMA_TRACE_FREE failed with error: %d\n", ret);
}
if (only_stop)
goto out;
ret = sof_dtrace_host_release(sdev);
if (ret < 0)
dev_err(sdev->dev, "Host dtrace release failed %d\n", ret);
priv->dtrace_state = SOF_DTRACE_DISABLED;
out:
priv->dtrace_draining = true;
wake_up(&priv->trace_sleep);
}
static void ipc3_dtrace_suspend(struct snd_sof_dev *sdev, pm_message_t pm_state)
{
ipc3_dtrace_release(sdev, pm_state.event == SOF_DSP_PM_D0);
}
static int ipc3_dtrace_resume(struct snd_sof_dev *sdev)
{
return ipc3_dtrace_enable(sdev);
}
static void ipc3_dtrace_free(struct snd_sof_dev *sdev)
{
struct sof_dtrace_priv *priv = sdev->fw_trace_data;
/* release trace */
ipc3_dtrace_release(sdev, false);
if (priv->dma_trace_pages) {
snd_dma_free_pages(&priv->dmatb);
snd_dma_free_pages(&priv->dmatp);
priv->dma_trace_pages = 0;
}
}
const struct sof_ipc_fw_tracing_ops ipc3_dtrace_ops = {
.init = ipc3_dtrace_init,
.free = ipc3_dtrace_free,
.fw_crashed = ipc3_dtrace_fw_crashed,
.suspend = ipc3_dtrace_suspend,
.resume = ipc3_dtrace_resume,
};