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// SPDX-License-Identifier: (GPL-2.0-only 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;
debugfs_create_file("trace", 0444, sdev->debugfs_root, dfse,
&sof_dfs_trace_fops);
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_supported)
return 0;
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, ¶ms.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, ¶ms, 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;
if (!sdev->dtrace_is_supported)
return 0;
/* 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->dev, &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)
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