1 files changed, 669 insertions, 0 deletions

diff --git a/sound/soc/sof/ipc4-mtrace.c b/sound/soc/sof/ipc4-mtrace.c
new file mode 100644
index 000000000000..9f1e33ee8826
--- /dev/null
+++ b/sound/soc/sof/ipc4-mtrace.c
@@ -0,0 +1,669 @@
+// SPDX-License-Identifier: GPL-2.0-only
+//
+// Copyright(c) 2022 Intel Corporation. All rights reserved.
+
+#include <linux/debugfs.h>
+#include <linux/sched/signal.h>
+#include <sound/sof/ipc4/header.h>
+#include "sof-priv.h"
+#include "ipc4-priv.h"
+
+/*
+ * debug info window is organized in 16 (equal sized) pages:
+ *
+ *	------------------------
+ *	| Page0  - descriptors |
+ *	------------------------
+ *	| Page1  - slot0       |
+ *	------------------------
+ *	| Page2  - slot1       |
+ *	------------------------
+ *	|         ...          |
+ *	------------------------
+ *	| Page14  - slot13     |
+ *	------------------------
+ *	| Page15  - slot14     |
+ *	------------------------
+ *
+ * The slot size == page size
+ *
+ * The first page contains descriptors for the remaining 15 cores
+ * The slot descriptor is:
+ * u32 res_id;
+ * u32 type;
+ * u32 vma;
+ *
+ * Log buffer slots have the following layout:
+ * u32 host_read_ptr;
+ * u32 dsp_write_ptr;
+ * u8 buffer[];
+ *
+ * The two pointers are offsets within the buffer.
+ */
+
+#define FW_EPOCH_DELTA				11644473600LL
+
+#define MAX_ALLOWED_LIBRARIES			16
+
+#define SOF_IPC4_INVALID_SLOT_OFFSET		0xffffffff
+
+ /* for debug and critical types */
+#define SOF_MTRACE_SLOT_CORE_MASK		GENMASK(7, 0)
+#define SOF_MTRACE_SLOT_TYPE_MASK		GENMASK(31, 8)
+
+#define DEFAULT_AGING_TIMER_PERIOD_MS		0x100
+#define DEFAULT_FIFO_FULL_TIMER_PERIOD_MS	0x1000
+
+/* ipc4 log level and source definitions for logs_priorities_mask */
+#define SOF_MTRACE_LOG_LEVEL_CRITICAL		BIT(0)
+#define SOF_MTRACE_LOG_LEVEL_ERROR		BIT(1)
+#define SOF_MTRACE_LOG_LEVEL_WARNING		BIT(2)
+#define SOF_MTRACE_LOG_LEVEL_INFO		BIT(3)
+#define SOF_MTRACE_LOG_LEVEL_VERBOSE		BIT(4)
+#define SOF_MTRACE_LOG_SOURCE_INFRA		BIT(5) /* log source 0 */
+#define SOF_MTRACE_LOG_SOURCE_HAL		BIT(6)
+#define SOF_MTRACE_LOG_SOURCE_MODULE		BIT(7)
+#define SOF_MTRACE_LOG_SOURCE_AUDIO		BIT(8)
+#define SOF_MTRACE_LOG_SOURCE_SCHEDULER		BIT(9)
+#define SOF_MTRACE_LOG_SOURCE_ULP_INFRA		BIT(10)
+#define SOF_MTRACE_LOG_SOURCE_ULP_MODULE	BIT(11)
+#define SOF_MTRACE_LOG_SOURCE_VISION		BIT(12) /* log source 7 */
+#define DEFAULT_LOGS_PRIORITIES_MASK	(SOF_MTRACE_LOG_LEVEL_CRITICAL | \
+					 SOF_MTRACE_LOG_LEVEL_ERROR |	 \
+					 SOF_MTRACE_LOG_LEVEL_WARNING |	 \
+					 SOF_MTRACE_LOG_LEVEL_INFO |	 \
+					 SOF_MTRACE_LOG_SOURCE_INFRA |	 \
+					 SOF_MTRACE_LOG_SOURCE_HAL |	 \
+					 SOF_MTRACE_LOG_SOURCE_MODULE |	 \
+					 SOF_MTRACE_LOG_SOURCE_AUDIO)
+
+struct sof_log_state_info {
+	u32 aging_timer_period;
+	u32 fifo_full_timer_period;
+	u32 enable;
+	u32 logs_priorities_mask[MAX_ALLOWED_LIBRARIES];
+} __packed;
+
+enum sof_mtrace_state {
+	SOF_MTRACE_DISABLED,
+	SOF_MTRACE_INITIALIZING,
+	SOF_MTRACE_ENABLED,
+};
+
+struct sof_mtrace_core_data {
+	struct snd_sof_dev *sdev;
+
+	int id;
+	u32 slot_offset;
+	void *log_buffer;
+	struct mutex buffer_lock; /* for log_buffer alloc/free */
+	u32 host_read_ptr;
+	u32 dsp_write_ptr;
+	/* pos update IPC arrived before the slot offset is known, queried */
+	bool delayed_pos_update;
+	wait_queue_head_t trace_sleep;
+};
+
+struct sof_mtrace_priv {
+	struct snd_sof_dev *sdev;
+	enum sof_mtrace_state mtrace_state;
+	struct sof_log_state_info state_info;
+
+	struct sof_mtrace_core_data cores[];
+};
+
+static int sof_ipc4_mtrace_dfs_open(struct inode *inode, struct file *file)
+{
+	struct sof_mtrace_core_data *core_data = inode->i_private;
+	int ret;
+
+	mutex_lock(&core_data->buffer_lock);
+
+	if (core_data->log_buffer) {
+		ret = -EBUSY;
+		goto out;
+	}
+
+	ret = debugfs_file_get(file->f_path.dentry);
+	if (unlikely(ret))
+		goto out;
+
+	core_data->log_buffer = kmalloc(SOF_IPC4_DEBUG_SLOT_SIZE, GFP_KERNEL);
+	if (!core_data->log_buffer) {
+		debugfs_file_put(file->f_path.dentry);
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	ret = simple_open(inode, file);
+	if (ret) {
+		kfree(core_data->log_buffer);
+		debugfs_file_put(file->f_path.dentry);
+	}
+
+out:
+	mutex_unlock(&core_data->buffer_lock);
+
+	return ret;
+}
+
+static bool sof_wait_mtrace_avail(struct sof_mtrace_core_data *core_data)
+{
+	wait_queue_entry_t wait;
+
+	/* data immediately available */
+	if (core_data->host_read_ptr != core_data->dsp_write_ptr)
+		return true;
+
+	/* wait for available trace data from FW */
+	init_waitqueue_entry(&wait, current);
+	set_current_state(TASK_INTERRUPTIBLE);
+	add_wait_queue(&core_data->trace_sleep, &wait);
+
+	if (!signal_pending(current)) {
+		/* set timeout to max value, no error code */
+		schedule_timeout(MAX_SCHEDULE_TIMEOUT);
+	}
+	remove_wait_queue(&core_data->trace_sleep, &wait);
+
+	if (core_data->host_read_ptr != core_data->dsp_write_ptr)
+		return true;
+
+	return false;
+}
+
+static ssize_t sof_ipc4_mtrace_dfs_read(struct file *file, char __user *buffer,
+					size_t count, loff_t *ppos)
+{
+	struct sof_mtrace_core_data *core_data = file->private_data;
+	u32 log_buffer_offset, log_buffer_size, read_ptr, write_ptr;
+	struct snd_sof_dev *sdev = core_data->sdev;
+	struct sof_mtrace_priv *priv = sdev->fw_trace_data;
+	void *log_buffer = core_data->log_buffer;
+	loff_t lpos = *ppos;
+	u32 avail;
+	int ret;
+
+	/* check pos and count */
+	if (lpos < 0)
+		return -EINVAL;
+	if (!count || count < sizeof(avail))
+		return 0;
+
+	/* get available count based on current host offset */
+	if (!sof_wait_mtrace_avail(core_data)) {
+		/* No data available */
+		avail = 0;
+		if (copy_to_user(buffer, &avail, sizeof(avail)))
+			return -EFAULT;
+
+		return 0;
+	}
+
+	if (core_data->slot_offset == SOF_IPC4_INVALID_SLOT_OFFSET)
+		return 0;
+
+	/* The log data buffer starts after the two pointer in the slot */
+	log_buffer_offset =  core_data->slot_offset + (sizeof(u32) * 2);
+	/* The log data size excludes the pointers */
+	log_buffer_size = SOF_IPC4_DEBUG_SLOT_SIZE - (sizeof(u32) * 2);
+
+	read_ptr = core_data->host_read_ptr;
+	write_ptr = core_data->dsp_write_ptr;
+
+	if (read_ptr < write_ptr)
+		avail = write_ptr - read_ptr;
+	else
+		avail = log_buffer_size - read_ptr + write_ptr;
+
+	if (!avail)
+		return 0;
+
+	if (avail > log_buffer_size)
+		avail = log_buffer_size;
+
+	/* Need space for the initial u32 of the avail */
+	if (avail > count - sizeof(avail))
+		avail = count - sizeof(avail);
+
+	if (sof_debug_check_flag(SOF_DBG_PRINT_DMA_POSITION_UPDATE_LOGS))
+		dev_dbg(sdev->dev,
+			"core%d, host read: %#x, dsp write: %#x, avail: %#x\n",
+			core_data->id, read_ptr, write_ptr, avail);
+
+	if (read_ptr < write_ptr) {
+		/* Read data between read pointer and write pointer */
+		sof_mailbox_read(sdev, log_buffer_offset + read_ptr, log_buffer, avail);
+	} else {
+		/* read from read pointer to end of the slot */
+		sof_mailbox_read(sdev, log_buffer_offset + read_ptr, log_buffer,
+				 avail - write_ptr);
+		/* read from slot start to write pointer */
+		if (write_ptr)
+			sof_mailbox_read(sdev, log_buffer_offset,
+					 (u8 *)(log_buffer) + avail - write_ptr,
+					 write_ptr);
+	}
+
+	/* first write the number of bytes we have gathered */
+	ret = copy_to_user(buffer, &avail, sizeof(avail));
+	if (ret)
+		return -EFAULT;
+
+	/* Followed by the data itself */
+	ret = copy_to_user(buffer + sizeof(avail), log_buffer, avail);
+	if (ret)
+		return -EFAULT;
+
+	/* Update the host_read_ptr in the slot for this core */
+	read_ptr += avail;
+	if (read_ptr >= log_buffer_size)
+		read_ptr -= log_buffer_size;
+	sof_mailbox_write(sdev, core_data->slot_offset, &read_ptr, sizeof(read_ptr));
+
+	/* Only update the host_read_ptr if mtrace is enabled */
+	if (priv->mtrace_state != SOF_MTRACE_DISABLED)
+		core_data->host_read_ptr = read_ptr;
+
+	/*
+	 * Ask for a new buffer from user space for the next chunk, not
+	 * streaming due to the heading number of bytes value.
+	 */
+	*ppos += count;
+
+	return count;
+}
+
+static int sof_ipc4_mtrace_dfs_release(struct inode *inode, struct file *file)
+{
+	struct sof_mtrace_core_data *core_data = inode->i_private;
+
+	debugfs_file_put(file->f_path.dentry);
+
+	mutex_lock(&core_data->buffer_lock);
+	kfree(core_data->log_buffer);
+	core_data->log_buffer = NULL;
+	mutex_unlock(&core_data->buffer_lock);
+
+	return 0;
+}
+
+static const struct file_operations sof_dfs_mtrace_fops = {
+	.open = sof_ipc4_mtrace_dfs_open,
+	.read = sof_ipc4_mtrace_dfs_read,
+	.llseek = default_llseek,
+	.release = sof_ipc4_mtrace_dfs_release,
+
+	.owner = THIS_MODULE,
+};
+
+static ssize_t sof_ipc4_priority_mask_dfs_read(struct file *file, char __user *to,
+					       size_t count, loff_t *ppos)
+{
+	struct sof_mtrace_priv *priv = file->private_data;
+	int i, ret, offset, remaining;
+	char *buf;
+
+	/*
+	 * one entry (14 char + new line = 15):
+	 * " 0: 000001ef"
+	 *
+	 * 16 * 15 + 1 = 241
+	 */
+	buf = kzalloc(241, GFP_KERNEL);
+	if (!buf)
+		return -ENOMEM;
+
+	for (i = 0; i < MAX_ALLOWED_LIBRARIES; i++) {
+		offset = strlen(buf);
+		remaining = 241 - offset;
+		snprintf(buf + offset, remaining, "%2d: 0x%08x\n", i,
+			 priv->state_info.logs_priorities_mask[i]);
+	}
+
+	ret = simple_read_from_buffer(to, count, ppos, buf, strlen(buf));
+
+	kfree(buf);
+	return ret;
+}
+
+static ssize_t sof_ipc4_priority_mask_dfs_write(struct file *file,
+						const char __user *from,
+						size_t count, loff_t *ppos)
+{
+	struct sof_mtrace_priv *priv = file->private_data;
+	unsigned int id;
+	char *buf;
+	u32 mask;
+	int ret;
+
+	/*
+	 * To update Nth mask entry, write:
+	 * "N,0x1234" or "N,1234" to the debugfs file
+	 * The mask will be interpreted as hexadecimal number
+	 */
+	buf = memdup_user_nul(from, count);
+	if (IS_ERR(buf))
+		return PTR_ERR(buf);
+
+	ret = sscanf(buf, "%u,0x%x", &id, &mask);
+	if (ret != 2) {
+		ret = sscanf(buf, "%u,%x", &id, &mask);
+		if (ret != 2) {
+			ret = -EINVAL;
+			goto out;
+		}
+	}
+
+	if (id >= MAX_ALLOWED_LIBRARIES) {
+		ret = -EINVAL;
+		goto out;
+	}
+
+	priv->state_info.logs_priorities_mask[id] = mask;
+	ret = count;
+
+out:
+	kfree(buf);
+	return ret;
+}
+
+static const struct file_operations sof_dfs_priority_mask_fops = {
+	.open = simple_open,
+	.read = sof_ipc4_priority_mask_dfs_read,
+	.write = sof_ipc4_priority_mask_dfs_write,
+	.llseek = default_llseek,
+
+	.owner = THIS_MODULE,
+};
+
+static int mtrace_debugfs_create(struct snd_sof_dev *sdev)
+{
+	struct sof_mtrace_priv *priv = sdev->fw_trace_data;
+	struct dentry *dfs_root;
+	char dfs_name[100];
+	int i;
+
+	dfs_root = debugfs_create_dir("mtrace", sdev->debugfs_root);
+	if (IS_ERR_OR_NULL(dfs_root))
+		return 0;
+
+	/* Create files for the logging parameters */
+	debugfs_create_u32("aging_timer_period", 0644, dfs_root,
+			   &priv->state_info.aging_timer_period);
+	debugfs_create_u32("fifo_full_timer_period", 0644, dfs_root,
+			   &priv->state_info.fifo_full_timer_period);
+	debugfs_create_file("logs_priorities_mask", 0644, dfs_root, priv,
+			    &sof_dfs_priority_mask_fops);
+
+	/* Separate log files per core */
+	for (i = 0; i < sdev->num_cores; i++) {
+		snprintf(dfs_name, sizeof(dfs_name), "core%d", i);
+		debugfs_create_file(dfs_name, 0444, dfs_root, &priv->cores[i],
+				    &sof_dfs_mtrace_fops);
+	}
+
+	return 0;
+}
+
+static int ipc4_mtrace_enable(struct snd_sof_dev *sdev)
+{
+	struct sof_mtrace_priv *priv = sdev->fw_trace_data;
+	const struct sof_ipc_ops *iops = sdev->ipc->ops;
+	struct sof_ipc4_msg msg;
+	u64 system_time;
+	ktime_t kt;
+	int ret;
+
+	if (priv->mtrace_state != SOF_MTRACE_DISABLED)
+		return 0;
+
+	msg.primary = SOF_IPC4_MSG_TARGET(SOF_IPC4_MODULE_MSG);
+	msg.primary |= SOF_IPC4_MSG_DIR(SOF_IPC4_MSG_REQUEST);
+	msg.primary |= SOF_IPC4_MOD_ID(SOF_IPC4_MOD_INIT_BASEFW_MOD_ID);
+	msg.primary |= SOF_IPC4_MOD_INSTANCE(SOF_IPC4_MOD_INIT_BASEFW_INSTANCE_ID);
+	msg.extension = SOF_IPC4_MOD_EXT_MSG_PARAM_ID(SOF_IPC4_FW_PARAM_SYSTEM_TIME);
+
+	/* The system time is in usec, UTC, epoch is 1601-01-01 00:00:00 */
+	kt = ktime_add_us(ktime_get_real(), FW_EPOCH_DELTA * USEC_PER_SEC);
+	system_time = ktime_to_us(kt);
+	msg.data_size = sizeof(system_time);
+	msg.data_ptr = &system_time;
+	ret = iops->set_get_data(sdev, &msg, msg.data_size, true);
+	if (ret)
+		return ret;
+
+	msg.extension = SOF_IPC4_MOD_EXT_MSG_PARAM_ID(SOF_IPC4_FW_PARAM_ENABLE_LOGS);
+
+	priv->state_info.enable = 1;
+
+	msg.data_size = sizeof(priv->state_info);
+	msg.data_ptr = &priv->state_info;
+
+	priv->mtrace_state = SOF_MTRACE_INITIALIZING;
+	ret = iops->set_get_data(sdev, &msg, msg.data_size, true);
+	if (ret) {
+		priv->mtrace_state = SOF_MTRACE_DISABLED;
+		return ret;
+	}
+
+	priv->mtrace_state = SOF_MTRACE_ENABLED;
+
+	return 0;
+}
+
+static void ipc4_mtrace_disable(struct snd_sof_dev *sdev)
+{
+	struct sof_mtrace_priv *priv = sdev->fw_trace_data;
+	const struct sof_ipc_ops *iops = sdev->ipc->ops;
+	struct sof_ipc4_msg msg;
+	int i;
+
+	if (priv->mtrace_state == SOF_MTRACE_DISABLED)
+		return;
+
+	msg.primary = SOF_IPC4_MSG_TARGET(SOF_IPC4_MODULE_MSG);
+	msg.primary |= SOF_IPC4_MSG_DIR(SOF_IPC4_MSG_REQUEST);
+	msg.primary |= SOF_IPC4_MOD_ID(SOF_IPC4_MOD_INIT_BASEFW_MOD_ID);
+	msg.primary |= SOF_IPC4_MOD_INSTANCE(SOF_IPC4_MOD_INIT_BASEFW_INSTANCE_ID);
+	msg.extension = SOF_IPC4_MOD_EXT_MSG_PARAM_ID(SOF_IPC4_FW_PARAM_ENABLE_LOGS);
+
+	priv->state_info.enable = 0;
+
+	msg.data_size = sizeof(priv->state_info);
+	msg.data_ptr = &priv->state_info;
+	iops->set_get_data(sdev, &msg, msg.data_size, true);
+
+	priv->mtrace_state = SOF_MTRACE_DISABLED;
+
+	for (i = 0; i < sdev->num_cores; i++) {
+		struct sof_mtrace_core_data *core_data = &priv->cores[i];
+
+		core_data->host_read_ptr = 0;
+		core_data->dsp_write_ptr = 0;
+		wake_up(&core_data->trace_sleep);
+	}
+}
+
+/*
+ * Each DSP core logs to a dedicated slot.
+ * Parse the slot descriptors at debug_box offset to find the debug log slots
+ * and map them to cores.
+ * There are 15 slots and therefore 15 descriptors to check (MAX_MTRACE_SLOTS)
+ */
+static void sof_mtrace_find_core_slots(struct snd_sof_dev *sdev)
+{
+	struct sof_mtrace_priv *priv = sdev->fw_trace_data;
+	struct sof_mtrace_core_data *core_data;
+	u32 slot_desc_type_offset, type, core;
+	int i;
+
+	for (i = 0; i < SOF_IPC4_MAX_DEBUG_SLOTS; i++) {
+		/* The type is the second u32 in the slot descriptor */
+		slot_desc_type_offset = sdev->debug_box.offset;
+		slot_desc_type_offset += SOF_IPC4_DEBUG_DESCRIPTOR_SIZE * i + sizeof(u32);
+		sof_mailbox_read(sdev, slot_desc_type_offset, &type, sizeof(type));
+
+		if ((type & SOF_MTRACE_SLOT_TYPE_MASK) == SOF_IPC4_DEBUG_SLOT_DEBUG_LOG) {
+			core = type & SOF_MTRACE_SLOT_CORE_MASK;
+
+			if (core >= sdev->num_cores) {
+				dev_dbg(sdev->dev, "core%u is invalid for slot%d\n",
+					core, i);
+				continue;
+			}
+
+			core_data = &priv->cores[core];
+			/*
+			 * The area reserved for descriptors have the same size
+			 * as a slot.
+			 * In other words: slot0 starts at
+			 * debug_box + SOF_MTRACE_SLOT_SIZE offset
+			 */
+			core_data->slot_offset = sdev->debug_box.offset;
+			core_data->slot_offset += SOF_IPC4_DEBUG_SLOT_SIZE * (i + 1);
+			dev_dbg(sdev->dev, "slot%d is used for core%u\n", i, core);
+			if (core_data->delayed_pos_update) {
+				sof_ipc4_mtrace_update_pos(sdev, core);
+				core_data->delayed_pos_update = false;
+			}
+		} else if (type) {
+			dev_dbg(sdev->dev, "slot%d is not a log slot (%#x)\n", i, type);
+		}
+	}
+}
+
+static int ipc4_mtrace_init(struct snd_sof_dev *sdev)
+{
+	struct sof_ipc4_fw_data *ipc4_data = sdev->private;
+	struct sof_mtrace_priv *priv;
+	int i, ret;
+
+	if (sdev->fw_trace_data) {
+		dev_err(sdev->dev, "fw_trace_data has been already allocated\n");
+		return -EBUSY;
+	}
+
+	if (!ipc4_data->mtrace_log_bytes ||
+	    ipc4_data->mtrace_type != SOF_IPC4_MTRACE_INTEL_CAVS_2) {
+		sdev->fw_trace_is_supported = false;
+		return 0;
+	}
+
+	priv = devm_kzalloc(sdev->dev, struct_size(priv, cores, sdev->num_cores),
+			    GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	sdev->fw_trace_data = priv;
+
+	/* Set initial values for mtrace parameters */
+	priv->state_info.aging_timer_period = DEFAULT_AGING_TIMER_PERIOD_MS;
+	priv->state_info.fifo_full_timer_period = DEFAULT_FIFO_FULL_TIMER_PERIOD_MS;
+	/* Only enable basefw logs initially (index 0 is always basefw) */
+	priv->state_info.logs_priorities_mask[0] = DEFAULT_LOGS_PRIORITIES_MASK;
+
+	for (i = 0; i < sdev->num_cores; i++) {
+		struct sof_mtrace_core_data *core_data = &priv->cores[i];
+
+		init_waitqueue_head(&core_data->trace_sleep);
+		mutex_init(&core_data->buffer_lock);
+		core_data->sdev = sdev;
+		core_data->id = i;
+	}
+
+	ret = ipc4_mtrace_enable(sdev);
+	if (ret) {
+		/*
+		 * Mark firmware tracing as not supported and return 0 to not
+		 * block the whole audio stack
+		 */
+		sdev->fw_trace_is_supported = false;
+		dev_dbg(sdev->dev, "initialization failed, fw tracing is disabled\n");
+		return 0;
+	}
+
+	sof_mtrace_find_core_slots(sdev);
+
+	ret = mtrace_debugfs_create(sdev);
+	if (ret)
+		ipc4_mtrace_disable(sdev);
+
+	return ret;
+}
+
+static void ipc4_mtrace_free(struct snd_sof_dev *sdev)
+{
+	ipc4_mtrace_disable(sdev);
+}
+
+static int sof_ipc4_mtrace_update_pos_all_cores(struct snd_sof_dev *sdev)
+{
+	int i;
+
+	for (i = 0; i < sdev->num_cores; i++)
+		sof_ipc4_mtrace_update_pos(sdev, i);
+
+	return 0;
+}
+
+int sof_ipc4_mtrace_update_pos(struct snd_sof_dev *sdev, int core)
+{
+	struct sof_mtrace_priv *priv = sdev->fw_trace_data;
+	struct sof_mtrace_core_data *core_data;
+
+	if (!sdev->fw_trace_is_supported ||
+	    priv->mtrace_state == SOF_MTRACE_DISABLED)
+		return 0;
+
+	if (core >= sdev->num_cores)
+		return -EINVAL;
+
+	core_data = &priv->cores[core];
+
+	if (core_data->slot_offset == SOF_IPC4_INVALID_SLOT_OFFSET) {
+		core_data->delayed_pos_update = true;
+		return 0;
+	}
+
+	/* Read out the dsp_write_ptr from the slot for this core */
+	sof_mailbox_read(sdev, core_data->slot_offset + sizeof(u32),
+			 &core_data->dsp_write_ptr, 4);
+	core_data->dsp_write_ptr -= core_data->dsp_write_ptr % 4;
+
+	if (sof_debug_check_flag(SOF_DBG_PRINT_DMA_POSITION_UPDATE_LOGS))
+		dev_dbg(sdev->dev, "core%d, host read: %#x, dsp write: %#x",
+			core, core_data->host_read_ptr, core_data->dsp_write_ptr);
+
+	wake_up(&core_data->trace_sleep);
+
+	return 0;
+}
+
+static void ipc4_mtrace_fw_crashed(struct snd_sof_dev *sdev)
+{
+	/*
+	 * The DSP might not be able to send SOF_IPC4_NOTIFY_LOG_BUFFER_STATUS
+	 * messages anymore, so check the log buffer status on all
+	 * cores and process any pending messages.
+	 */
+	sof_ipc4_mtrace_update_pos_all_cores(sdev);
+}
+
+static int ipc4_mtrace_resume(struct snd_sof_dev *sdev)
+{
+	return ipc4_mtrace_enable(sdev);
+}
+
+static void ipc4_mtrace_suspend(struct snd_sof_dev *sdev, pm_message_t pm_state)
+{
+	ipc4_mtrace_disable(sdev);
+}
+
+const struct sof_ipc_fw_tracing_ops ipc4_mtrace_ops = {
+	.init = ipc4_mtrace_init,
+	.free = ipc4_mtrace_free,
+	.fw_crashed = ipc4_mtrace_fw_crashed,
+	.suspend = ipc4_mtrace_suspend,
+	.resume = ipc4_mtrace_resume,
+};