Merge tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-tracegrafted

Pull tracing fixes from Steven Rostedt:

 - Fix error output of boot instance creation failure

   Currently if a boot instance creation fails, instead of printing out
   the name of the instance that failed, it prints "(null)". That is
   because it prints "cur_str" that had already been processed by
   strsep(). Print the saved name instead.

   While at it, print the error code of the failure.

 - Fix use-after-free for same named historgrams

   Histograms can be named so that they can be used in multiple events.
   But if the named histogram has a variable attached, the second event
   that uses the named histogram which duplicates it and needs to free
   the original after duplication leaves the old variable in place and
   still visible. If another histogram uses than variable, it will use
   the stale one which will try to reference the freed duplicate
   histogram and crash the kernel.

   Free the duplicate variables along with the duplicated histogram
   data.

 - Check return value of kthread_run() in event self test

   The events self tests uses a kthread for testing but does not check
   if it succeeded in creating a kthread. If the kthread creation were
   to fail, the code will still try to call kthread_stop() on the error
   returned.

 - Fix race between reading trace_pipe and updating subbuffer size

   If a user is reading the trace_pipe file at the same time they update
   the ring buffer sub-buffer size, can cause the trace_pipe read to
   read stale data. Add trace_access_lock() around updating the ring
   buffer sub-buffer size.

 - Fix eventfs_inode on failure path in creation of the events directory

   In the creation of the "events" directory, if after allocating the
   eventfs_inode a failure is detected, it calls cleanup_ei() which
   calls free_ei(). The free_ei() will test if eventfs_inode being freed
   has no children. It is a bug if it does. But on the failure case of
   the creation of the "events" directory, the children lists have not
   yet been initialized and the free will trigger a warning because
   list_empty() on an uninitialized list returns false.

   Move the initialization into init_ei() where it makes more sense and
   makes sure that a created eventfs_inode has its lists initialized
   upon creation.

 - Check return value of kthread_run() in ftrace direct sample code

   The sample code that shows how to use the ftrace direct calls does
   not test the return of kthread_run() to see if it succeeds. Return a
   failure if the kthread_run() doesn't succeed.

 - Clear user events state on fork in case of alloc failure

   On fork, the child gets a pointer to the parent's user events state.
   It makes a copy of it then updates the child's pointer to it. But if
   the allocation fails, the duplication function leaves the child with
   a pointer to its parent's descriptor. When the child cleans up its
   data, it will free the parent's descriptor while the parent is still
   using it.

   In the duplication function, set the child's user_event_mm to NULL
   before testing if the allocation succeeded, and when it exits it will
   not free the parent's descriptor.

 - Fix retry exhaustion in simple ring buffer reader swap

   simple_ring_buffer_swap_reader_page() starts with retry set to 8 and
   post-decrements it only after a failed link replacement. On the final
   attempt, a successful replacement leaves retry at zero, while a
   failed replacement leaves it at -1.

   But the check for success expects the retry value to be non-zero and
   exits with an error on zero. This is the opposite result. Fix it.

 - Fail nicely when the remote swap_reader_page() returns an error

   Currently, if the swap_reader_page() of a remote buffer fails, it
   triggers a WARN_ON_ONCE() and continues normally. Instead, have it
   exit with an error and a pr_warn() print instead of a full WARNING.

* tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
  ring-buffer: Stop remote reader update when page swap fails
  tracing: Fix retry exhaustion in simple ring buffer reader swap
  tracing/user_events: Clear copied tracing state before fork duplication
  samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-multi-modify
  samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-modify
  eventfs: Initialize ei->children and ei->list in init_ei()
  tracing: Fix use-after-free in trace_pipe read on sub-buffer order change
  tracing: Fix crash passing ERR_PTR to kthread_stop()
  tracing: Fix use-after-free with same-name named triggers
  tracing: Fix logged instance name on creation failure

1 files changed, 601 insertions, 0 deletions

diff --git a/sound/soc/sof/sof-client-probes.c b/sound/soc/sof/sof-client-probes.c
new file mode 100644
index 000000000..124f55508
--- /dev/null
+++ b/sound/soc/sof/sof-client-probes.c
@@ -0,0 +1,601 @@
+// SPDX-License-Identifier: GPL-2.0-only
+//
+// Copyright(c) 2019-2022 Intel Corporation
+//
+// Author: Cezary Rojewski <cezary.rojewski@intel.com>
+//
+// SOF client support:
+//  Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
+//  Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
+//
+
+#include <linux/debugfs.h>
+#include <linux/module.h>
+#include <linux/pm_runtime.h>
+#include <linux/string_helpers.h>
+#include <linux/stddef.h>
+
+#include <sound/soc.h>
+#include <sound/sof/header.h>
+#include <sound/sof/ipc4/header.h>
+#include "sof-client.h"
+#include "sof-client-probes.h"
+#include "sof-audio.h"
+
+#ifdef CONFIG_SND_SOC_SOF_IPC4
+#include "ipc4-priv.h"
+#endif
+
+#define SOF_PROBES_SUSPEND_DELAY_MS 3000
+/* only extraction supported for now */
+#define SOF_PROBES_NUM_DAI_LINKS 1
+
+#define SOF_PROBES_INVALID_NODE_ID UINT_MAX
+
+static bool __read_mostly sof_probes_enabled;
+module_param_named(enable, sof_probes_enabled, bool, 0444);
+MODULE_PARM_DESC(enable, "Enable SOF probes support");
+
+static int sof_probes_compr_startup(struct snd_compr_stream *cstream,
+				    struct snd_soc_dai *dai)
+{
+	struct snd_soc_card *card = snd_soc_component_get_drvdata(dai->component);
+	struct sof_client_dev *cdev = snd_soc_card_get_drvdata(card);
+	struct sof_probes_priv *priv = cdev->data;
+	const struct sof_probes_host_ops *ops = priv->host_ops;
+	int ret;
+
+	if (sof_client_get_fw_state(cdev) == SOF_FW_CRASHED)
+		return -ENODEV;
+
+	ret = sof_client_core_module_get(cdev);
+	if (ret)
+		return ret;
+
+	ret = ops->startup(cdev, cstream, dai, &priv->extractor_stream_tag);
+	if (ret) {
+		dev_err(dai->dev, "Failed to startup probe stream: %d\n", ret);
+		priv->extractor_stream_tag = SOF_PROBES_INVALID_NODE_ID;
+		sof_client_core_module_put(cdev);
+	}
+
+	return ret;
+}
+
+static int sof_probes_compr_shutdown(struct snd_compr_stream *cstream,
+				     struct snd_soc_dai *dai)
+{
+	struct snd_soc_card *card = snd_soc_component_get_drvdata(dai->component);
+	struct sof_client_dev *cdev = snd_soc_card_get_drvdata(card);
+	struct sof_probes_priv *priv = cdev->data;
+	const struct sof_probes_host_ops *ops = priv->host_ops;
+	const struct sof_probes_ipc_ops *ipc = priv->ipc_ops;
+	struct sof_probe_point_desc *desc;
+	size_t num_desc;
+	int i, ret;
+
+	/* disconnect all probe points */
+	ret = ipc->points_info(cdev, &desc, &num_desc,
+			       PROBES_INFO_ACTIVE_PROBES);
+	if (ret < 0) {
+		dev_err(dai->dev, "Failed to get probe points: %d\n", ret);
+		goto exit;
+	}
+
+	for (i = 0; i < num_desc; i++)
+		ipc->points_remove(cdev, &desc[i].buffer_id, 1);
+	kfree(desc);
+
+exit:
+	ret = ipc->deinit(cdev);
+	if (ret < 0)
+		dev_err(dai->dev, "Failed to deinit probe: %d\n", ret);
+
+	priv->extractor_stream_tag = SOF_PROBES_INVALID_NODE_ID;
+	snd_compr_free_pages(cstream);
+
+	ret = ops->shutdown(cdev, cstream, dai);
+
+	sof_client_core_module_put(cdev);
+
+	return ret;
+}
+
+static int sof_probes_compr_set_params(struct snd_compr_stream *cstream,
+				       struct snd_compr_params *params,
+				       struct snd_soc_dai *dai)
+{
+	struct snd_soc_card *card = snd_soc_component_get_drvdata(dai->component);
+	struct sof_client_dev *cdev = snd_soc_card_get_drvdata(card);
+	struct snd_compr_runtime *rtd = cstream->runtime;
+	struct sof_probes_priv *priv = cdev->data;
+	const struct sof_probes_host_ops *ops = priv->host_ops;
+	const struct sof_probes_ipc_ops *ipc = priv->ipc_ops;
+	int ret;
+
+	cstream->dma_buffer.dev.type = SNDRV_DMA_TYPE_DEV_SG;
+	cstream->dma_buffer.dev.dev = sof_client_get_dma_dev(cdev);
+	ret = snd_compr_malloc_pages(cstream, rtd->buffer_size);
+	if (ret < 0)
+		return ret;
+
+	ret = ops->set_params(cdev, cstream, params, dai);
+	if (ret)
+		return ret;
+
+	ret = sof_client_boot_dsp(cdev);
+	if (ret)
+		return ret;
+
+	ret = ipc->init(cdev, priv->extractor_stream_tag, rtd->dma_bytes);
+	if (ret < 0) {
+		dev_err(dai->dev, "Failed to init probe: %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int sof_probes_compr_trigger(struct snd_compr_stream *cstream, int cmd,
+				    struct snd_soc_dai *dai)
+{
+	struct snd_soc_card *card = snd_soc_component_get_drvdata(dai->component);
+	struct sof_client_dev *cdev = snd_soc_card_get_drvdata(card);
+	struct sof_probes_priv *priv = cdev->data;
+	const struct sof_probes_host_ops *ops = priv->host_ops;
+
+	return ops->trigger(cdev, cstream, cmd, dai);
+}
+
+static int sof_probes_compr_pointer(struct snd_compr_stream *cstream,
+				    struct snd_compr_tstamp64 *tstamp,
+				    struct snd_soc_dai *dai)
+{
+	struct snd_soc_card *card = snd_soc_component_get_drvdata(dai->component);
+	struct sof_client_dev *cdev = snd_soc_card_get_drvdata(card);
+	struct sof_probes_priv *priv = cdev->data;
+	const struct sof_probes_host_ops *ops = priv->host_ops;
+
+	return ops->pointer(cdev, cstream, tstamp, dai);
+}
+
+static const struct snd_soc_cdai_ops sof_probes_compr_ops = {
+	.startup = sof_probes_compr_startup,
+	.shutdown = sof_probes_compr_shutdown,
+	.set_params = sof_probes_compr_set_params,
+	.trigger = sof_probes_compr_trigger,
+	.pointer = sof_probes_compr_pointer,
+};
+
+static int sof_probes_compr_copy(struct snd_soc_component *component,
+				 struct snd_compr_stream *cstream,
+				 char __user *buf, size_t count)
+{
+	struct snd_compr_runtime *rtd = cstream->runtime;
+	unsigned int offset, n;
+	void *ptr;
+	int ret;
+
+	if (count > rtd->buffer_size)
+		count = rtd->buffer_size;
+
+	div_u64_rem(rtd->total_bytes_transferred, rtd->buffer_size, &offset);
+	ptr = rtd->dma_area + offset;
+	n = rtd->buffer_size - offset;
+
+	if (count < n) {
+		ret = copy_to_user(buf, ptr, count);
+	} else {
+		ret = copy_to_user(buf, ptr, n);
+		ret += copy_to_user(buf + n, rtd->dma_area, count - n);
+	}
+
+	if (ret)
+		return count - ret;
+	return count;
+}
+
+static const struct snd_compress_ops sof_probes_compressed_ops = {
+	.copy = sof_probes_compr_copy,
+};
+
+static ssize_t sof_probes_dfs_points_read(struct file *file, char __user *to,
+					  size_t count, loff_t *ppos,
+					  enum sof_probe_info_type type)
+{
+	struct sof_client_dev *cdev = file->private_data;
+	struct sof_probes_priv *priv = cdev->data;
+	struct device *dev = &cdev->auxdev.dev;
+	struct sof_probe_point_desc *desc;
+	const struct sof_probes_ipc_ops *ipc = priv->ipc_ops;
+	int remaining, offset;
+	size_t num_desc;
+	char *buf;
+	int i, ret, err;
+
+	if (priv->extractor_stream_tag == SOF_PROBES_INVALID_NODE_ID) {
+		dev_warn(dev, "no extractor stream running\n");
+		return -ENOENT;
+	}
+
+	buf = kzalloc(PAGE_SIZE, GFP_KERNEL);
+	if (!buf)
+		return -ENOMEM;
+
+	ret = pm_runtime_resume_and_get(dev);
+	if (ret < 0 && ret != -EACCES) {
+		dev_err_ratelimited(dev, "debugfs read failed to resume %d\n", ret);
+		goto exit;
+	}
+
+	ret = sof_client_boot_dsp(cdev);
+	if (ret)
+		goto pm_error;
+
+	ret = ipc->points_info(cdev, &desc, &num_desc, type);
+	if (ret < 0)
+		goto pm_error;
+
+	for (i = 0; i < num_desc; i++) {
+		offset = strlen(buf);
+		remaining = PAGE_SIZE - offset;
+		if (ipc->point_print)
+			ret = ipc->point_print(cdev, buf + offset, remaining, &desc[i]);
+		else
+			ret = snprintf(buf + offset, remaining,
+				       "Id: %#010x  Purpose: %u  Node id: %#x\n",
+				       desc[i].buffer_id, desc[i].purpose, desc[i].stream_tag);
+
+		if (ret < 0 || ret >= remaining) {
+			/* truncate the output buffer at the last full line */
+			buf[offset] = '\0';
+			break;
+		}
+	}
+
+	ret = simple_read_from_buffer(to, count, ppos, buf, strlen(buf));
+
+	kfree(desc);
+
+pm_error:
+	err = pm_runtime_put_autosuspend(dev);
+	if (err < 0)
+		dev_err_ratelimited(dev, "debugfs read failed to idle %d\n", err);
+
+exit:
+	kfree(buf);
+	return ret;
+}
+
+static ssize_t sof_probes_dfs_active_points_read(struct file *file,
+						 char __user *to,
+						 size_t count, loff_t *ppos)
+{
+	return sof_probes_dfs_points_read(file, to, count, ppos,
+					  PROBES_INFO_ACTIVE_PROBES);
+}
+
+static ssize_t sof_probes_dfs_available_points_read(struct file *file,
+						    char __user *to,
+						    size_t count, loff_t *ppos)
+{
+	return sof_probes_dfs_points_read(file, to, count, ppos,
+					  PROBES_INFO_AVAILABE_PROBES);
+}
+
+static ssize_t
+sof_probes_dfs_points_write(struct file *file, const char __user *from,
+			    size_t count, loff_t *ppos)
+{
+	struct sof_client_dev *cdev = file->private_data;
+	struct sof_probes_priv *priv = cdev->data;
+	const struct sof_probes_ipc_ops *ipc = priv->ipc_ops;
+	struct device *dev = &cdev->auxdev.dev;
+	struct sof_probe_point_desc *desc;
+	u32 num_elems, *array;
+	size_t bytes;
+	int ret, err;
+
+	if (priv->extractor_stream_tag == SOF_PROBES_INVALID_NODE_ID) {
+		dev_warn(dev, "no extractor stream running\n");
+		return -ENOENT;
+	}
+
+	ret = parse_int_array_user(from, count, (int **)&array);
+	if (ret < 0)
+		return ret;
+
+	num_elems = *array;
+	bytes = sizeof(*array) * num_elems;
+	if (bytes % sizeof(*desc)) {
+		ret = -EINVAL;
+		goto exit;
+	}
+
+	desc = (struct sof_probe_point_desc *)&array[1];
+
+	ret = pm_runtime_resume_and_get(dev);
+	if (ret < 0 && ret != -EACCES) {
+		dev_err_ratelimited(dev, "debugfs write failed to resume %d\n", ret);
+		goto exit;
+	}
+
+	ret = sof_client_boot_dsp(cdev);
+	if (!ret) {
+		ret = ipc->points_add(cdev, desc, bytes / sizeof(*desc));
+		if (!ret)
+			ret = count;
+	}
+
+	err = pm_runtime_put_autosuspend(dev);
+	if (err < 0)
+		dev_err_ratelimited(dev, "debugfs write failed to idle %d\n", err);
+exit:
+	kfree(array);
+	return ret;
+}
+
+static const struct file_operations sof_probes_active_points_fops = {
+	.open = simple_open,
+	.read = sof_probes_dfs_active_points_read,
+	.write = sof_probes_dfs_points_write,
+	.llseek = default_llseek,
+
+	.owner = THIS_MODULE,
+};
+
+static const struct file_operations sof_probes_available_points_fops = {
+	.open = simple_open,
+	.read = sof_probes_dfs_available_points_read,
+	.llseek = default_llseek,
+
+	.owner = THIS_MODULE,
+};
+
+static ssize_t
+sof_probes_dfs_points_remove_write(struct file *file, const char __user *from,
+				   size_t count, loff_t *ppos)
+{
+	struct sof_client_dev *cdev = file->private_data;
+	struct sof_probes_priv *priv = cdev->data;
+	const struct sof_probes_ipc_ops *ipc = priv->ipc_ops;
+	struct device *dev = &cdev->auxdev.dev;
+	int ret, err;
+	u32 *array;
+
+	if (priv->extractor_stream_tag == SOF_PROBES_INVALID_NODE_ID) {
+		dev_warn(dev, "no extractor stream running\n");
+		return -ENOENT;
+	}
+
+	ret = parse_int_array_user(from, count, (int **)&array);
+	if (ret < 0)
+		return ret;
+
+	ret = pm_runtime_resume_and_get(dev);
+	if (ret < 0) {
+		dev_err_ratelimited(dev, "debugfs write failed to resume %d\n", ret);
+		goto exit;
+	}
+
+	ret = sof_client_boot_dsp(cdev);
+	if (!ret) {
+		ret = ipc->points_remove(cdev, &array[1], array[0]);
+		if (!ret)
+			ret = count;
+	}
+
+	err = pm_runtime_put_autosuspend(dev);
+	if (err < 0)
+		dev_err_ratelimited(dev, "debugfs write failed to idle %d\n", err);
+exit:
+	kfree(array);
+	return ret;
+}
+
+static const struct file_operations sof_probes_points_remove_fops = {
+	.open = simple_open,
+	.write = sof_probes_dfs_points_remove_write,
+	.llseek = default_llseek,
+
+	.owner = THIS_MODULE,
+};
+
+static const struct snd_soc_dai_ops sof_probes_dai_ops = {
+	.compress_new = snd_soc_new_compress,
+};
+
+static struct snd_soc_dai_driver sof_probes_dai_drv[] = {
+{
+	.name = "Probe Extraction CPU DAI",
+	.ops  = &sof_probes_dai_ops,
+	.cops = &sof_probes_compr_ops,
+	.capture = {
+		.stream_name = "Probe Extraction",
+		.channels_min = 1,
+		.channels_max = 8,
+		.rates = SNDRV_PCM_RATE_48000,
+		.rate_min = 48000,
+		.rate_max = 48000,
+	},
+},
+};
+
+static const struct snd_soc_component_driver sof_probes_component = {
+	.name = "sof-probes-component",
+	.compress_ops = &sof_probes_compressed_ops,
+	.module_get_upon_open = 1,
+	.legacy_dai_naming = 1,
+};
+
+static int sof_probes_client_probe(struct auxiliary_device *auxdev,
+				   const struct auxiliary_device_id *id)
+{
+	struct sof_client_dev *cdev = auxiliary_dev_to_sof_client_dev(auxdev);
+	struct dentry *dfsroot = sof_client_get_debugfs_root(cdev);
+	struct device *dev = &auxdev->dev;
+	struct snd_soc_dai_link_component platform_component[] = {
+		{
+			.name = dev_name(dev),
+		}
+	};
+	struct snd_soc_card *card;
+	struct sof_probes_priv *priv;
+	struct snd_soc_dai_link_component *cpus;
+	struct sof_probes_host_ops *ops;
+	struct snd_soc_dai_link *links;
+	int ret;
+
+	/* do not set up the probes support if it is not enabled */
+	if (!sof_probes_enabled)
+		return -ENXIO;
+
+	ops = dev_get_platdata(dev);
+	if (!ops) {
+		dev_err(dev, "missing platform data\n");
+		return -ENODEV;
+	}
+	if (!ops->startup || !ops->shutdown || !ops->set_params || !ops->trigger ||
+	    !ops->pointer) {
+		dev_err(dev, "missing platform callback(s)\n");
+		return -ENODEV;
+	}
+
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->host_ops = ops;
+
+	switch (sof_client_get_ipc_type(cdev)) {
+#ifdef CONFIG_SND_SOC_SOF_IPC4
+	case SOF_IPC_TYPE_4:
+		priv->ipc_ops = &ipc4_probe_ops;
+		break;
+#endif
+#ifdef CONFIG_SND_SOC_SOF_IPC3
+	case SOF_IPC_TYPE_3:
+		priv->ipc_ops = &ipc3_probe_ops;
+		break;
+#endif
+	default:
+		dev_err(dev, "Matching IPC ops not found.");
+		return -ENODEV;
+	}
+
+	cdev->data = priv;
+
+	/* register probes component driver and dai */
+	ret = devm_snd_soc_register_component(dev, &sof_probes_component,
+					      sof_probes_dai_drv,
+					      ARRAY_SIZE(sof_probes_dai_drv));
+	if (ret < 0) {
+		dev_err(dev, "failed to register SOF probes DAI driver %d\n", ret);
+		return ret;
+	}
+
+	/* set client data */
+	priv->extractor_stream_tag = SOF_PROBES_INVALID_NODE_ID;
+
+	/* create read-write probes_points debugfs entry */
+	priv->dfs_points = debugfs_create_file("probe_points", 0644, dfsroot,
+					       cdev, &sof_probes_active_points_fops);
+
+	/* create read-write probe_points_remove debugfs entry */
+	priv->dfs_points_remove = debugfs_create_file("probe_points_remove", 0644,
+						      dfsroot, cdev,
+						      &sof_probes_points_remove_fops);
+
+	/* create read-write probes_points debugfs entry */
+	priv->dfs_points = debugfs_create_file("probe_points_available", 0644, dfsroot,
+					       cdev, &sof_probes_available_points_fops);
+
+	links = devm_kcalloc(dev, SOF_PROBES_NUM_DAI_LINKS, sizeof(*links), GFP_KERNEL);
+	cpus = devm_kcalloc(dev, SOF_PROBES_NUM_DAI_LINKS, sizeof(*cpus), GFP_KERNEL);
+	if (!links || !cpus) {
+		debugfs_remove(priv->dfs_points);
+		debugfs_remove(priv->dfs_points_remove);
+		return -ENOMEM;
+	}
+
+	/* extraction DAI link */
+	links[0].name = "Compress Probe Capture";
+	links[0].id = 0;
+	links[0].cpus = &cpus[0];
+	links[0].num_cpus = 1;
+	links[0].cpus->dai_name = "Probe Extraction CPU DAI";
+	links[0].codecs = &snd_soc_dummy_dlc;
+	links[0].num_codecs = 1;
+	links[0].platforms = platform_component;
+	links[0].num_platforms = ARRAY_SIZE(platform_component);
+	links[0].nonatomic = 1;
+
+	card = &priv->card;
+
+	card->dev = dev;
+	card->name = "sof-probes";
+	card->owner = THIS_MODULE;
+	card->num_links = SOF_PROBES_NUM_DAI_LINKS;
+	card->dai_link = links;
+
+	snd_soc_card_set_drvdata(card, cdev);
+
+	ret = devm_snd_soc_register_card(dev, card);
+	if (ret < 0) {
+		debugfs_remove(priv->dfs_points);
+		debugfs_remove(priv->dfs_points_remove);
+		dev_err(dev, "Probes card register failed %d\n", ret);
+		return ret;
+	}
+
+	/*
+	 * set idle_bias_off to prevent the core from resuming the card->dev
+	 * call it after snd_soc_register_card()
+	 */
+	struct snd_soc_dapm_context *dapm = snd_soc_card_to_dapm(card);
+
+	snd_soc_dapm_set_idle_bias(dapm, false);
+
+	/* enable runtime PM */
+	pm_runtime_set_autosuspend_delay(dev, SOF_PROBES_SUSPEND_DELAY_MS);
+	pm_runtime_use_autosuspend(dev);
+	pm_runtime_enable(dev);
+	pm_runtime_mark_last_busy(dev);
+	pm_runtime_idle(dev);
+
+	return 0;
+}
+
+static void sof_probes_client_remove(struct auxiliary_device *auxdev)
+{
+	struct sof_client_dev *cdev = auxiliary_dev_to_sof_client_dev(auxdev);
+	struct sof_probes_priv *priv = cdev->data;
+
+	if (!sof_probes_enabled)
+		return;
+
+	pm_runtime_disable(&auxdev->dev);
+	debugfs_remove(priv->dfs_points);
+	debugfs_remove(priv->dfs_points_remove);
+}
+
+static const struct auxiliary_device_id sof_probes_client_id_table[] = {
+	{ .name = "snd_sof.hda-probes", },
+	{ .name = "snd_sof.acp-probes", },
+	{},
+};
+MODULE_DEVICE_TABLE(auxiliary, sof_probes_client_id_table);
+
+/* driver name will be set based on KBUILD_MODNAME */
+static struct auxiliary_driver sof_probes_client_drv = {
+	.probe = sof_probes_client_probe,
+	.remove = sof_probes_client_remove,
+
+	.id_table = sof_probes_client_id_table,
+};
+
+module_auxiliary_driver(sof_probes_client_drv);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("SOF Probes Client Driver");
+MODULE_IMPORT_NS("SND_SOC_SOF_CLIENT");