335 lines
8.3 KiB
C
335 lines
8.3 KiB
C
// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
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//
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// This file is provided under a dual BSD/GPLv2 license. When using or
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// redistributing this file, you may do so under either license.
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//
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// Copyright(c) 2018 Intel Corporation. All rights reserved.
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//
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// Author: Liam Girdwood <liam.r.girdwood@linux.intel.com>
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//
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#include <linux/debugfs.h>
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#include <linux/sched/signal.h>
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#include "sof-priv.h"
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#include "ops.h"
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static size_t sof_trace_avail(struct snd_sof_dev *sdev,
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loff_t pos, size_t buffer_size)
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{
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loff_t host_offset = READ_ONCE(sdev->host_offset);
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/*
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* If host offset is less than local pos, it means write pointer of
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* host DMA buffer has been wrapped. We should output the trace data
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* at the end of host DMA buffer at first.
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*/
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if (host_offset < pos)
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return buffer_size - pos;
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/* If there is available trace data now, it is unnecessary to wait. */
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if (host_offset > pos)
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return host_offset - pos;
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return 0;
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}
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static size_t sof_wait_trace_avail(struct snd_sof_dev *sdev,
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loff_t pos, size_t buffer_size)
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{
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wait_queue_entry_t wait;
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size_t ret = sof_trace_avail(sdev, pos, buffer_size);
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/* data immediately available */
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if (ret)
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return ret;
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if (!sdev->dtrace_is_enabled && sdev->dtrace_draining) {
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/*
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* tracing has ended and all traces have been
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* read by client, return EOF
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*/
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sdev->dtrace_draining = false;
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return 0;
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}
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/* wait for available trace data from FW */
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init_waitqueue_entry(&wait, current);
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set_current_state(TASK_INTERRUPTIBLE);
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add_wait_queue(&sdev->trace_sleep, &wait);
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if (!signal_pending(current)) {
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/* set timeout to max value, no error code */
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schedule_timeout(MAX_SCHEDULE_TIMEOUT);
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}
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remove_wait_queue(&sdev->trace_sleep, &wait);
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return sof_trace_avail(sdev, pos, buffer_size);
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}
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static ssize_t sof_dfsentry_trace_read(struct file *file, char __user *buffer,
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size_t count, loff_t *ppos)
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{
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struct snd_sof_dfsentry *dfse = file->private_data;
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struct snd_sof_dev *sdev = dfse->sdev;
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unsigned long rem;
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loff_t lpos = *ppos;
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size_t avail, buffer_size = dfse->size;
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u64 lpos_64;
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/* make sure we know about any failures on the DSP side */
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sdev->dtrace_error = false;
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/* check pos and count */
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if (lpos < 0)
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return -EINVAL;
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if (!count)
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return 0;
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/* check for buffer wrap and count overflow */
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lpos_64 = lpos;
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lpos = do_div(lpos_64, buffer_size);
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if (count > buffer_size - lpos) /* min() not used to avoid sparse warnings */
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count = buffer_size - lpos;
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/* get available count based on current host offset */
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avail = sof_wait_trace_avail(sdev, lpos, buffer_size);
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if (sdev->dtrace_error) {
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dev_err(sdev->dev, "error: trace IO error\n");
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return -EIO;
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}
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/* make sure count is <= avail */
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count = avail > count ? count : avail;
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/* copy available trace data to debugfs */
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rem = copy_to_user(buffer, ((u8 *)(dfse->buf) + lpos), count);
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if (rem)
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return -EFAULT;
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*ppos += count;
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/* move debugfs reading position */
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return count;
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}
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static int sof_dfsentry_trace_release(struct inode *inode, struct file *file)
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{
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struct snd_sof_dfsentry *dfse = inode->i_private;
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struct snd_sof_dev *sdev = dfse->sdev;
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/* avoid duplicate traces at next open */
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if (!sdev->dtrace_is_enabled)
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sdev->host_offset = 0;
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return 0;
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}
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static const struct file_operations sof_dfs_trace_fops = {
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.open = simple_open,
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.read = sof_dfsentry_trace_read,
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.llseek = default_llseek,
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.release = sof_dfsentry_trace_release,
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};
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static int trace_debugfs_create(struct snd_sof_dev *sdev)
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{
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struct snd_sof_dfsentry *dfse;
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if (!sdev)
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return -EINVAL;
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dfse = devm_kzalloc(sdev->dev, sizeof(*dfse), GFP_KERNEL);
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if (!dfse)
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return -ENOMEM;
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dfse->type = SOF_DFSENTRY_TYPE_BUF;
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dfse->buf = sdev->dmatb.area;
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dfse->size = sdev->dmatb.bytes;
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dfse->sdev = sdev;
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debugfs_create_file("trace", 0444, sdev->debugfs_root, dfse,
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&sof_dfs_trace_fops);
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return 0;
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}
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int snd_sof_init_trace_ipc(struct snd_sof_dev *sdev)
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{
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struct sof_ipc_fw_ready *ready = &sdev->fw_ready;
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struct sof_ipc_fw_version *v = &ready->version;
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struct sof_ipc_dma_trace_params_ext params;
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struct sof_ipc_reply ipc_reply;
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int ret;
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if (sdev->dtrace_is_enabled || !sdev->dma_trace_pages)
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return -EINVAL;
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/* set IPC parameters */
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params.hdr.cmd = SOF_IPC_GLB_TRACE_MSG;
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/* PARAMS_EXT is only supported from ABI 3.7.0 onwards */
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if (v->abi_version >= SOF_ABI_VER(3, 7, 0)) {
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params.hdr.size = sizeof(struct sof_ipc_dma_trace_params_ext);
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params.hdr.cmd |= SOF_IPC_TRACE_DMA_PARAMS_EXT;
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params.timestamp_ns = ktime_get(); /* in nanosecond */
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} else {
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params.hdr.size = sizeof(struct sof_ipc_dma_trace_params);
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params.hdr.cmd |= SOF_IPC_TRACE_DMA_PARAMS;
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}
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params.buffer.phy_addr = sdev->dmatp.addr;
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params.buffer.size = sdev->dmatb.bytes;
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params.buffer.pages = sdev->dma_trace_pages;
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params.stream_tag = 0;
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sdev->host_offset = 0;
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sdev->dtrace_draining = false;
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ret = snd_sof_dma_trace_init(sdev, ¶ms.stream_tag);
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if (ret < 0) {
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dev_err(sdev->dev,
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"error: fail in snd_sof_dma_trace_init %d\n", ret);
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return ret;
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}
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dev_dbg(sdev->dev, "stream_tag: %d\n", params.stream_tag);
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/* send IPC to the DSP */
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ret = sof_ipc_tx_message(sdev->ipc,
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params.hdr.cmd, ¶ms, sizeof(params),
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&ipc_reply, sizeof(ipc_reply));
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if (ret < 0) {
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dev_err(sdev->dev,
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"error: can't set params for DMA for trace %d\n", ret);
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goto trace_release;
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}
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ret = snd_sof_dma_trace_trigger(sdev, SNDRV_PCM_TRIGGER_START);
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if (ret < 0) {
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dev_err(sdev->dev,
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"error: snd_sof_dma_trace_trigger: start: %d\n", ret);
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goto trace_release;
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}
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sdev->dtrace_is_enabled = true;
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return 0;
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trace_release:
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snd_sof_dma_trace_release(sdev);
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return ret;
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}
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int snd_sof_init_trace(struct snd_sof_dev *sdev)
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{
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int ret;
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/* set false before start initialization */
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sdev->dtrace_is_enabled = false;
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/* allocate trace page table buffer */
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ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, sdev->dev,
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PAGE_SIZE, &sdev->dmatp);
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if (ret < 0) {
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dev_err(sdev->dev,
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"error: can't alloc page table for trace %d\n", ret);
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return ret;
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}
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/* allocate trace data buffer */
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ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV_SG, sdev->dev,
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DMA_BUF_SIZE_FOR_TRACE, &sdev->dmatb);
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if (ret < 0) {
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dev_err(sdev->dev,
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"error: can't alloc buffer for trace %d\n", ret);
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goto page_err;
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}
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/* create compressed page table for audio firmware */
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ret = snd_sof_create_page_table(sdev, &sdev->dmatb, sdev->dmatp.area,
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sdev->dmatb.bytes);
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if (ret < 0)
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goto table_err;
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sdev->dma_trace_pages = ret;
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dev_dbg(sdev->dev, "dma_trace_pages: %d\n", sdev->dma_trace_pages);
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if (sdev->first_boot) {
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ret = trace_debugfs_create(sdev);
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if (ret < 0)
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goto table_err;
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}
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init_waitqueue_head(&sdev->trace_sleep);
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ret = snd_sof_init_trace_ipc(sdev);
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if (ret < 0)
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goto table_err;
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return 0;
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table_err:
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sdev->dma_trace_pages = 0;
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snd_dma_free_pages(&sdev->dmatb);
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page_err:
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snd_dma_free_pages(&sdev->dmatp);
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return ret;
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}
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EXPORT_SYMBOL(snd_sof_init_trace);
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int snd_sof_trace_update_pos(struct snd_sof_dev *sdev,
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struct sof_ipc_dma_trace_posn *posn)
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{
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if (sdev->dtrace_is_enabled && sdev->host_offset != posn->host_offset) {
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sdev->host_offset = posn->host_offset;
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wake_up(&sdev->trace_sleep);
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}
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if (posn->overflow != 0)
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dev_err(sdev->dev,
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"error: DSP trace buffer overflow %u bytes. Total messages %d\n",
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posn->overflow, posn->messages);
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return 0;
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}
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/* an error has occurred within the DSP that prevents further trace */
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void snd_sof_trace_notify_for_error(struct snd_sof_dev *sdev)
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{
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if (sdev->dtrace_is_enabled) {
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dev_err(sdev->dev, "error: waking up any trace sleepers\n");
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sdev->dtrace_error = true;
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wake_up(&sdev->trace_sleep);
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}
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}
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EXPORT_SYMBOL(snd_sof_trace_notify_for_error);
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void snd_sof_release_trace(struct snd_sof_dev *sdev)
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{
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int ret;
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if (!sdev->dtrace_is_enabled)
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return;
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ret = snd_sof_dma_trace_trigger(sdev, SNDRV_PCM_TRIGGER_STOP);
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if (ret < 0)
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dev_err(sdev->dev,
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"error: snd_sof_dma_trace_trigger: stop: %d\n", ret);
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ret = snd_sof_dma_trace_release(sdev);
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if (ret < 0)
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dev_err(sdev->dev,
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"error: fail in snd_sof_dma_trace_release %d\n", ret);
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sdev->dtrace_is_enabled = false;
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sdev->dtrace_draining = true;
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wake_up(&sdev->trace_sleep);
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}
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EXPORT_SYMBOL(snd_sof_release_trace);
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void snd_sof_free_trace(struct snd_sof_dev *sdev)
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{
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snd_sof_release_trace(sdev);
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snd_dma_free_pages(&sdev->dmatb);
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snd_dma_free_pages(&sdev->dmatp);
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}
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EXPORT_SYMBOL(snd_sof_free_trace);
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