Re: [PATCH v3 6/8] accel/qaic: Add mhi_qaic_cntl

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Hi,

On 06.03.2023 22:34, Jeffrey Hugo wrote:
> From: Pranjal Ramajor Asha Kanojiya <quic_pkanojiy@xxxxxxxxxxx>
> 
> Some of the MHI channels for an AIC100 device need to be routed to
> userspace so that userspace can communicate directly with QSM. The MHI
> bus does not support this, and while the WWAN subsystem does (for the same
> reasons), AIC100 is not a WWAN device. Also, MHI is not something that
> other accelerators are expected to share, thus an accel subsystem function
> that meets this usecase is unlikely.
> 
> Create a QAIC specific MHI userspace shim that exposes these channels.
> 
> Start with QAIC_SAHARA which is required to boot AIC100 and is consumed by
> the kickstart application as documented in aic100.rst
> 
> Each AIC100 instance (currently, up to 16) in a system will create a
> chardev for QAIC_SAHARA. This chardev will be found as
> /dev/<mhi instance>_QAIC_SAHARA
> For example - /dev/mhi0_QAIC_SAHARA
> 
> Signed-off-by: Pranjal Ramajor Asha Kanojiya <quic_pkanojiy@xxxxxxxxxxx>
> Signed-off-by: Jeffrey Hugo <quic_jhugo@xxxxxxxxxxx>
> Reviewed-by: Carl Vanderlip <quic_carlv@xxxxxxxxxxx>
> Reviewed-by: Stanislaw Gruszka <stanislaw.gruszka@xxxxxxxxxxxxxxx>
> ---
>  drivers/accel/qaic/mhi_qaic_ctrl.c | 581 +++++++++++++++++++++++++++++++++++++
>  drivers/accel/qaic/mhi_qaic_ctrl.h |  11 +
>  2 files changed, 592 insertions(+)
>  create mode 100644 drivers/accel/qaic/mhi_qaic_ctrl.c
>  create mode 100644 drivers/accel/qaic/mhi_qaic_ctrl.h
> 
> diff --git a/drivers/accel/qaic/mhi_qaic_ctrl.c b/drivers/accel/qaic/mhi_qaic_ctrl.c
> new file mode 100644
> index 0000000..f97279fd
> --- /dev/null
> +++ b/drivers/accel/qaic/mhi_qaic_ctrl.c
> @@ -0,0 +1,581 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/* Copyright (c) 2022-2023 Qualcomm Innovation Center, Inc. All rights reserved. */
> +
> +#include <linux/kernel.h>
> +#include <linux/mhi.h>
> +#include <linux/mod_devicetable.h>
> +#include <linux/module.h>
> +#include <linux/poll.h>
> +#include <linux/version.h>
> +#include <linux/xarray.h>
> +#include <uapi/linux/eventpoll.h>
> +
> +#include "mhi_qaic_ctrl.h"
> +#include "qaic.h"
> +
> +#define MHI_QAIC_CTRL_DRIVER_NAME	"mhi_qaic_ctrl"
> +#define MHI_QAIC_CTRL_MAX_MINORS	128
> +#define MHI_MAX_MTU			0xffff
> +static DEFINE_XARRAY_ALLOC(mqc_xa);
> +static struct class *mqc_dev_class;
> +static int mqc_dev_major;
> +
> +/**
> + * struct mqc_buf - Buffer structure used to receive data from device
> + * @data: Address of data to read from
> + * @odata: Original address returned from *alloc() API. Used to free this buf.
> + * @len: Length of data in byte
> + * @node: This buffer will be part of list managed in struct mqc_dev
> + */
> +struct mqc_buf {
> +	void *data;
> +	void *odata;
> +	size_t len;
> +	struct list_head node;
> +};
> +
> +/**
> + * struct mqc_dev - MHI QAIC Control Device
> + * @minor: MQC device node minor number
> + * @mhi_dev: Associated mhi device object
> + * @mtu: Max TRE buffer length
> + * @enabled: Flag to track the state of the MQC device
> + * @lock: Mutex lock to serialize access to open_count
> + * @read_lock: Mutex lock to serialize readers
> + * @write_lock: Mutex lock to serialize writers
> + * @ul_wq: Wait queue for writers
> + * @dl_wq: Wait queue for readers
> + * @dl_queue_lock: Spin lock to serialize access to download queue
> + * @dl_queue: Queue of downloaded buffers
> + * @open_count: Track open counts
> + * @ref_count: Reference count for this structure
> + */
> +struct mqc_dev {
> +	uint32_t minor;
> +	struct mhi_device *mhi_dev;
> +	size_t mtu;
> +	bool enabled;

Is enabled really needed. I would think that mhi_qaic_ctrl_remove() won't be called
unless all open files are closed.

> +	struct mutex lock;
> +	struct mutex read_lock;
> +	struct mutex write_lock;
> +	wait_queue_head_t ul_wq;
> +	wait_queue_head_t dl_wq;
> +	spinlock_t dl_queue_lock;
> +	struct list_head dl_queue;
> +	unsigned int open_count;
> +	struct kref ref_count;
> +};
> +
> +static void mqc_dev_release(struct kref *ref)
> +{
> +	struct mqc_dev *mqcdev = container_of(ref, struct mqc_dev, ref_count);
> +
> +	mutex_destroy(&mqcdev->read_lock);
> +	mutex_destroy(&mqcdev->write_lock);
> +	mutex_destroy(&mqcdev->lock);
> +	kfree(mqcdev);
> +}
> +
> +static int mhi_qaic_ctrl_fill_dl_queue(struct mqc_dev *mqcdev)
> +{
> +	struct mhi_device *mhi_dev = mqcdev->mhi_dev;
> +	struct mqc_buf *ctrlbuf;
> +	int rx_budget;
> +	int ret = 0;
> +	void *data;
> +
> +	rx_budget = mhi_get_free_desc_count(mhi_dev, DMA_FROM_DEVICE);
> +	if (rx_budget < 0)
> +		return -EIO;
> +
> +	while (rx_budget--) {
> +		data = kzalloc(mqcdev->mtu + sizeof(*ctrlbuf), GFP_KERNEL);
> +		if (!data)
> +			return -ENOMEM;
> +
> +		ctrlbuf = data + mqcdev->mtu;
> +		ctrlbuf->odata = data;
> +
> +		ret = mhi_queue_buf(mhi_dev, DMA_FROM_DEVICE, data, mqcdev->mtu, MHI_EOT);
> +		if (ret) {
> +			kfree(data);
> +			dev_err(&mhi_dev->dev, "Failed to queue buffer\n");
> +			return ret;
> +		}
> +	}
> +
> +	return ret;
> +}
> +
> +static int mhi_qaic_ctrl_dev_start_chan(struct mqc_dev *mqcdev)
> +{
> +	struct device *dev = &mqcdev->mhi_dev->dev;
> +	int ret = 0;
> +
> +	ret = mutex_lock_interruptible(&mqcdev->lock);
> +	if (ret)
> +		return ret;
> +	if (!mqcdev->enabled) {

How "enabled" can be 0 here? It is rather not possible to open the device after
it was released.

> +		ret = -ENODEV;
> +		goto release_dev_lock;
> +	}
> +	if (!mqcdev->open_count) {
> +		ret = mhi_prepare_for_transfer(mqcdev->mhi_dev);
> +		if (ret) {
> +			dev_err(dev, "Error starting transfer channels\n");
> +			goto release_dev_lock;
> +		}
> +
> +		ret = mhi_qaic_ctrl_fill_dl_queue(mqcdev);
> +		if (ret) {
> +			dev_err(dev, "Error filling download queue.\n");
> +			goto mhi_unprepare;
> +		}
> +	}
> +	mqcdev->open_count++;
> +	mutex_unlock(&mqcdev->lock);
> +
> +	return 0;
> +
> +mhi_unprepare:
> +	mhi_unprepare_from_transfer(mqcdev->mhi_dev);
> +release_dev_lock:
> +	mutex_unlock(&mqcdev->lock);
> +	return ret;
> +}
> +
> +static struct mqc_dev *mqc_dev_get_by_minor(unsigned int minor)
> +{
> +	struct mqc_dev *mqcdev;
> +
> +	xa_lock(&mqc_xa);
> +	mqcdev = xa_load(&mqc_xa, minor);
> +	if (mqcdev)
> +		kref_get(&mqcdev->ref_count);
> +	xa_unlock(&mqc_xa);
> +
> +	return mqcdev;
> +}
> +
> +static int mhi_qaic_ctrl_open(struct inode *inode, struct file *filp)
> +{
> +	struct mqc_dev *mqcdev;
> +	int ret;
> +
> +	mqcdev = mqc_dev_get_by_minor(iminor(inode));
> +	if (!mqcdev) {
> +		pr_debug("mqc: minor %d not found\n", iminor(inode));
> +		return -EINVAL;
> +	}
> +
> +	ret = mhi_qaic_ctrl_dev_start_chan(mqcdev);
> +	if (ret) {
> +		kref_put(&mqcdev->ref_count, mqc_dev_release);
> +		return ret;
> +	}
> +
> +	filp->private_data = mqcdev;
> +
> +	return 0;
> +}
> +
> +static void mhi_qaic_ctrl_buf_free(struct mqc_buf *ctrlbuf)
> +{
> +	list_del(&ctrlbuf->node);
> +	kfree(ctrlbuf->odata);
> +}
> +
> +static void __mhi_qaic_ctrl_release(struct mqc_dev *mqcdev)
> +{
> +	struct mqc_buf *ctrlbuf, *tmp;
> +
> +	mhi_unprepare_from_transfer(mqcdev->mhi_dev);
> +	wake_up_interruptible(&mqcdev->ul_wq);
> +	wake_up_interruptible(&mqcdev->dl_wq);
> +	/*
> +	 * Free the dl_queue. As we have already unprepared mhi transfers, we
> +	 * do not expect any callback functions that update dl_queue hence no need
> +	 * to grab dl_queue lock.
> +	 */
> +	mutex_lock(&mqcdev->read_lock);
> +	list_for_each_entry_safe(ctrlbuf, tmp, &mqcdev->dl_queue, node)
> +		mhi_qaic_ctrl_buf_free(ctrlbuf);
> +	mutex_unlock(&mqcdev->read_lock);
> +}
> +
> +static int mhi_qaic_ctrl_release(struct inode *inode, struct file *file)
> +{
> +	struct mqc_dev *mqcdev = file->private_data;
> +
> +	mutex_lock(&mqcdev->lock);
> +	mqcdev->open_count--;
> +	if (!mqcdev->open_count && mqcdev->enabled)
> +		__mhi_qaic_ctrl_release(mqcdev);
> +	mutex_unlock(&mqcdev->lock);
> +
> +	kref_put(&mqcdev->ref_count, mqc_dev_release);
> +
> +	return 0;
> +}
> +
> +static __poll_t mhi_qaic_ctrl_poll(struct file *file, poll_table *wait)
> +{
> +	struct mqc_dev *mqcdev = file->private_data;
> +	struct mhi_device *mhi_dev;
> +	__poll_t mask = 0;
> +
> +	mhi_dev = mqcdev->mhi_dev;
> +
> +	poll_wait(file, &mqcdev->ul_wq, wait);
> +	poll_wait(file, &mqcdev->dl_wq, wait);
> +
> +	mutex_lock(&mqcdev->lock);
> +	if (!mqcdev->enabled || !mqcdev->open_count) {
> +		mutex_unlock(&mqcdev->lock);
> +		return EPOLLERR;
> +	}
> +
> +	spin_lock_bh(&mqcdev->dl_queue_lock);
> +	if (!list_empty(&mqcdev->dl_queue))
> +		mask |= EPOLLIN | EPOLLRDNORM;
> +	spin_unlock_bh(&mqcdev->dl_queue_lock);
> +
> +	if (mutex_lock_interruptible(&mqcdev->write_lock)) {
> +		mutex_unlock(&mqcdev->lock);
> +		return EPOLLERR;
> +	}
> +	if (mhi_get_free_desc_count(mhi_dev, DMA_TO_DEVICE) > 0)
> +		mask |= EPOLLOUT | EPOLLWRNORM;
> +	mutex_unlock(&mqcdev->write_lock);
> +	mutex_unlock(&mqcdev->lock);
> +
> +	dev_dbg(&mhi_dev->dev, "Client attempted to poll, returning mask 0x%x\n", mask);
> +
> +	return mask;
> +}
> +
> +static int mhi_qaic_ctrl_tx(struct mqc_dev *mqcdev)
> +{
> +	int ret;
> +
> +	ret = wait_event_interruptible(mqcdev->ul_wq,
> +				       (!mqcdev->enabled || !mqcdev->open_count ||
> +				       mhi_get_free_desc_count(mqcdev->mhi_dev,
> +							       DMA_TO_DEVICE) > 0));
> +
> +	if (!mqcdev->open_count)
> +		return -EPIPE;
> +	if (!mqcdev->enabled)
> +		return -ENODEV;

I think that both "open_count" and "enabled" will never be 0 here.
This function is called by read() and read() cannot be called without open
file descriptor.

> +
> +	return ret;
> +}
> +
> +static ssize_t mhi_qaic_ctrl_write(struct file *file, const char __user *buf, size_t count,
> +				   loff_t *offp)
> +{
> +	struct mqc_dev *mqcdev = file->private_data;
> +	struct mhi_device *mhi_dev;
> +	size_t bytes_xfered = 0;
> +	struct device *dev;
> +	int ret, nr_desc;
> +
> +	mhi_dev = mqcdev->mhi_dev;
> +	dev = &mhi_dev->dev;
> +
> +	if (!mhi_dev->ul_chan)
> +		return -EOPNOTSUPP;
> +
> +	if (!buf || !count)
> +		return -EINVAL;
> +
> +	dev_dbg(dev, "Request to transfer %zu bytes\n", count);
> +
> +	ret = mhi_qaic_ctrl_tx(mqcdev);
> +	if (ret) {
> +		dev_err(dev, "Failed to write %d\n", ret);
> +		return ret;
> +	}
> +
> +	if (mutex_lock_interruptible(&mqcdev->write_lock))
> +		return -EINTR;
> +
> +	nr_desc = mhi_get_free_desc_count(mhi_dev, DMA_TO_DEVICE);
> +	if (nr_desc * mqcdev->mtu < count) {
> +		ret = -EMSGSIZE;
> +		dev_dbg(dev, "Buffer too big to transfer\n");
> +		goto unlock_mutex;
> +	}
> +
> +	while (count != bytes_xfered) {
> +		enum mhi_flags flags;
> +		size_t to_copy;
> +		void *kbuf;
> +
> +		to_copy = min_t(size_t, count - bytes_xfered, mqcdev->mtu);
> +		kbuf = kmalloc(to_copy, GFP_KERNEL);
> +		if (!kbuf) {
> +			ret = -ENOMEM;
> +			goto unlock_mutex;
> +		}
> +
> +		ret = copy_from_user(kbuf, buf + bytes_xfered, to_copy);
> +		if (ret) {
> +			kfree(kbuf);
> +			ret = -EFAULT;
> +			goto unlock_mutex;
> +		}
> +
> +		if (bytes_xfered + to_copy == count)
> +			flags = MHI_EOT;
> +		else
> +			flags = MHI_CHAIN;
> +
> +		ret = mhi_queue_buf(mhi_dev, DMA_TO_DEVICE, kbuf, to_copy, flags);
> +		if (ret) {
> +			kfree(kbuf);
> +			dev_err(dev, "Failed to queue buf of size %zu\n", to_copy);
> +			goto unlock_mutex;
> +		}
> +
> +		bytes_xfered += to_copy;
> +	}
> +
> +	mutex_unlock(&mqcdev->write_lock);
> +	dev_dbg(dev, "bytes xferred: %zu\n", bytes_xfered);
> +
> +	return bytes_xfered;
> +
> +unlock_mutex:
> +	mutex_unlock(&mqcdev->write_lock);
> +	return ret;
> +}
> +
> +static int mhi_qaic_ctrl_rx(struct mqc_dev *mqcdev)
> +{
> +	int ret;
> +
> +	ret = wait_event_interruptible(mqcdev->dl_wq, (!mqcdev->enabled || !mqcdev->open_count ||
> +				       !list_empty(&mqcdev->dl_queue)));
> +
> +	if (!mqcdev->open_count)
> +		return -EPERM;
> +	if (!mqcdev->enabled)
> +		return -ENODEV;
> +
> +	return ret;
> +}
> +
> +static ssize_t mhi_qaic_ctrl_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
> +{
> +	struct mqc_dev *mqcdev = file->private_data;
> +	struct mqc_buf *ctrlbuf;
> +	size_t to_copy;
> +	int ret;
> +
> +	if (!mqcdev->mhi_dev->dl_chan)
> +		return -EOPNOTSUPP;
> +
> +	ret = mhi_qaic_ctrl_rx(mqcdev);
> +	if (ret) {
> +		dev_err(&mqcdev->mhi_dev->dev, "Failed to read %d\n", ret);
> +		return ret;
> +	}
> +
> +	if (mutex_lock_interruptible(&mqcdev->read_lock))
> +		return -EINTR;
> +
> +	ctrlbuf = list_first_entry_or_null(&mqcdev->dl_queue, struct mqc_buf, node);
> +	if (!ctrlbuf) {
> +		mutex_unlock(&mqcdev->read_lock);
> +		dev_dbg(&mqcdev->mhi_dev->dev, "Device has been released\n");

I don't believe that the device can be released while in read() syscall.
This error can only happen if read() from another thread processed the dl_queue first.

> +		ret = -ENODEV;
> +		goto error_out;
> +	}
> +
> +	to_copy = min_t(size_t, count, ctrlbuf->len);
> +	if (copy_to_user(buf, ctrlbuf->data, to_copy)) {
> +		mutex_unlock(&mqcdev->read_lock);
> +		dev_dbg(&mqcdev->mhi_dev->dev, "Failed to copy data to user buffer\n");
> +		ret = -EFAULT;
> +		goto error_out;
> +	}
> +
> +	ctrlbuf->len -= to_copy;
> +	ctrlbuf->data += to_copy;
> +
> +	if (!ctrlbuf->len) {
> +		spin_lock_bh(&mqcdev->dl_queue_lock);
> +		mhi_qaic_ctrl_buf_free(ctrlbuf);
> +		spin_unlock_bh(&mqcdev->dl_queue_lock);
> +		mhi_qaic_ctrl_fill_dl_queue(mqcdev);
> +		dev_dbg(&mqcdev->mhi_dev->dev, "Read buf freed\n");
> +	}
> +
> +	mutex_unlock(&mqcdev->read_lock);
> +	return to_copy;
> +
> +error_out:
> +	mutex_unlock(&mqcdev->read_lock);
> +	return ret;
> +}
> +
> +static const struct file_operations mhidev_fops = {
> +	.owner = THIS_MODULE,
> +	.open = mhi_qaic_ctrl_open,
> +	.release = mhi_qaic_ctrl_release,
> +	.read = mhi_qaic_ctrl_read,
> +	.write = mhi_qaic_ctrl_write,
> +	.poll = mhi_qaic_ctrl_poll,
> +};
> +
> +static void mhi_qaic_ctrl_ul_xfer_cb(struct mhi_device *mhi_dev, struct mhi_result *mhi_result)
> +{
> +	struct mqc_dev *mqcdev = dev_get_drvdata(&mhi_dev->dev);
> +
> +	dev_dbg(&mhi_dev->dev, "%s: status: %d xfer_len: %zu\n", __func__,
> +		mhi_result->transaction_status, mhi_result->bytes_xferd);
> +
> +	kfree(mhi_result->buf_addr);
> +
> +	if (!mhi_result->transaction_status)
> +		wake_up_interruptible(&mqcdev->ul_wq);
> +}
> +
> +static void mhi_qaic_ctrl_dl_xfer_cb(struct mhi_device *mhi_dev, struct mhi_result *mhi_result)
> +{
> +	struct mqc_dev *mqcdev = dev_get_drvdata(&mhi_dev->dev);
> +	struct mqc_buf *ctrlbuf;
> +
> +	dev_dbg(&mhi_dev->dev, "%s: status: %d receive_len: %zu\n", __func__,
> +		mhi_result->transaction_status, mhi_result->bytes_xferd);
> +
> +	if (mhi_result->transaction_status &&
> +	    mhi_result->transaction_status != -EOVERFLOW) {
> +		kfree(mhi_result->buf_addr);
> +		return;
> +	}
> +
> +	ctrlbuf = mhi_result->buf_addr + mqcdev->mtu;
> +	ctrlbuf->data = mhi_result->buf_addr;
> +	ctrlbuf->len = mhi_result->bytes_xferd;
> +	spin_lock_bh(&mqcdev->dl_queue_lock);
> +	list_add_tail(&ctrlbuf->node, &mqcdev->dl_queue);
> +	spin_unlock_bh(&mqcdev->dl_queue_lock);
> +
> +	wake_up_interruptible(&mqcdev->dl_wq);
> +}
> +
> +static int mhi_qaic_ctrl_probe(struct mhi_device *mhi_dev, const struct mhi_device_id *id)
> +{
> +	struct mqc_dev *mqcdev;
> +	struct device *dev;
> +	int ret;
> +
> +	mqcdev = kzalloc(sizeof(*mqcdev), GFP_KERNEL);
> +	if (!mqcdev)
> +		return -ENOMEM;
> +
> +	kref_init(&mqcdev->ref_count);
> +	mutex_init(&mqcdev->lock);
> +	mqcdev->mhi_dev = mhi_dev;
> +
> +	ret = xa_alloc(&mqc_xa, &mqcdev->minor, mqcdev, XA_LIMIT(0, MHI_QAIC_CTRL_MAX_MINORS),
> +		       GFP_KERNEL);
> +	if (ret) {
> +		kfree(mqcdev);
> +		return ret;
> +	}
> +
> +	init_waitqueue_head(&mqcdev->ul_wq);
> +	init_waitqueue_head(&mqcdev->dl_wq);
> +	mutex_init(&mqcdev->read_lock);
> +	mutex_init(&mqcdev->write_lock);
> +	spin_lock_init(&mqcdev->dl_queue_lock);
> +	INIT_LIST_HEAD(&mqcdev->dl_queue);
> +	mqcdev->mtu = min_t(size_t, id->driver_data, MHI_MAX_MTU);
> +	mqcdev->enabled = true;
> +	mqcdev->open_count = 0;
> +	dev_set_drvdata(&mhi_dev->dev, mqcdev);
> +
> +	dev = device_create(mqc_dev_class, &mhi_dev->dev, MKDEV(mqc_dev_major, mqcdev->minor),
> +			    mqcdev, "%s", dev_name(&mhi_dev->dev));
> +	if (IS_ERR(dev)) {
> +		xa_erase(&mqc_xa, mqcdev->minor);
> +		dev_set_drvdata(&mhi_dev->dev, NULL);
> +		kfree(mqcdev);
> +		return PTR_ERR(dev);
> +	}
> +
> +	return 0;
> +};
> +
> +static void mhi_qaic_ctrl_remove(struct mhi_device *mhi_dev)
> +{
> +	struct mqc_dev *mqcdev = dev_get_drvdata(&mhi_dev->dev);
> +
> +	device_destroy(mqc_dev_class, MKDEV(mqc_dev_major, mqcdev->minor));
> +
> +	mutex_lock(&mqcdev->lock);
> +	mqcdev->enabled = false;
> +	if (mqcdev->open_count)
> +		__mhi_qaic_ctrl_release(mqcdev);
> +	mutex_unlock(&mqcdev->lock);
> +
> +	xa_erase(&mqc_xa, mqcdev->minor);
> +	kref_put(&mqcdev->ref_count, mqc_dev_release);
> +}
> +
> +/* .driver_data stores max mtu */
> +static const struct mhi_device_id mhi_qaic_ctrl_match_table[] = {
> +	{ .chan = "QAIC_SAHARA", .driver_data = SZ_32K},
> +	{},
> +};
> +MODULE_DEVICE_TABLE(mhi, mhi_qaic_ctrl_match_table);
> +
> +static struct mhi_driver mhi_qaic_ctrl_driver = {
> +	.id_table = mhi_qaic_ctrl_match_table,
> +	.remove = mhi_qaic_ctrl_remove,
> +	.probe = mhi_qaic_ctrl_probe,
> +	.ul_xfer_cb = mhi_qaic_ctrl_ul_xfer_cb,
> +	.dl_xfer_cb = mhi_qaic_ctrl_dl_xfer_cb,
> +	.driver = {
> +		.name = MHI_QAIC_CTRL_DRIVER_NAME,
> +	},
> +};
> +
> +int mhi_qaic_ctrl_init(void)
> +{
> +	int ret;
> +
> +	ret = register_chrdev(0, MHI_QAIC_CTRL_DRIVER_NAME, &mhidev_fops);
> +	if (ret < 0)
> +		return ret;
> +
> +	mqc_dev_major = ret;
> +	mqc_dev_class = class_create(THIS_MODULE, MHI_QAIC_CTRL_DRIVER_NAME);
> +	if (IS_ERR(mqc_dev_class)) {
> +		ret = PTR_ERR(mqc_dev_class);
> +		goto unregister_chrdev;
> +	}
> +
> +	ret = mhi_driver_register(&mhi_qaic_ctrl_driver);
> +	if (ret)
> +		goto destroy_class;
> +
> +	return 0;
> +
> +destroy_class:
> +	class_destroy(mqc_dev_class);
> +unregister_chrdev:
> +	unregister_chrdev(mqc_dev_major, MHI_QAIC_CTRL_DRIVER_NAME);
> +	return ret;
> +}
> +
> +void mhi_qaic_ctrl_deinit(void)
> +{
> +	mhi_driver_unregister(&mhi_qaic_ctrl_driver);
> +	class_destroy(mqc_dev_class);
> +	unregister_chrdev(mqc_dev_major, MHI_QAIC_CTRL_DRIVER_NAME);
> +	xa_destroy(&mqc_xa);
> +}
> diff --git a/drivers/accel/qaic/mhi_qaic_ctrl.h b/drivers/accel/qaic/mhi_qaic_ctrl.h
> new file mode 100644
> index 0000000..0545540
> --- /dev/null
> +++ b/drivers/accel/qaic/mhi_qaic_ctrl.h
> @@ -0,0 +1,11 @@
> +/* SPDX-License-Identifier: GPL-2.0-only
> + *
> + * Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved.
> + */
> +
> +#ifndef __MHI_QAIC_CTRL_H__
> +#define __MHI_QAIC_CTRL_H__
> +
> +int mhi_qaic_ctrl_init(void);
> +void mhi_qaic_ctrl_deinit(void);

Please add a new line here.

> +#endif /* __MHI_QAIC_CTRL_H__ */

Regards,
Jacek



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