[PATCH] Revert "accel/qaic: Add mhi_qaic_cntl"

[PATCH] Revert "accel/qaic: Add mhi_qaic_cntl"

[Jeffrey Hugo]

This reverts commit 566fc96198b4bb07ca6806386956669881225271.

This exposes a userspace API that is still under debate.  Revert the
change before the uAPI gets exposed to avoid making a mistake.  QAIC is
otherwise still functional.

Suggested-by: Daniel Vetter <daniel@ffwll.ch>
Signed-off-by: Jeffrey Hugo <quic_jhugo@quicinc.com>
Reviewed-by: Pranjal Ramajor Asha Kanojiya <quic_pkanojiy@quicinc.com>
---
 drivers/accel/qaic/Makefile        |   1 -
 drivers/accel/qaic/mhi_qaic_ctrl.c | 569 -------------------------------------
 drivers/accel/qaic/mhi_qaic_ctrl.h |  12 -
 drivers/accel/qaic/qaic_drv.c      |  10 -
 4 files changed, 592 deletions(-)
 delete mode 100644 drivers/accel/qaic/mhi_qaic_ctrl.c
 delete mode 100644 drivers/accel/qaic/mhi_qaic_ctrl.h

diff --git a/drivers/accel/qaic/Makefile b/drivers/accel/qaic/Makefile
index d5f4952..2418418 100644
--- a/drivers/accel/qaic/Makefile
+++ b/drivers/accel/qaic/Makefile
@@ -7,7 +7,6 @@ obj-$(CONFIG_DRM_ACCEL_QAIC)	:= qaic.o
 
 qaic-y := \
 	mhi_controller.o \
-	mhi_qaic_ctrl.o \
 	qaic_control.o \
 	qaic_data.o \
 	qaic_drv.o
diff --git a/drivers/accel/qaic/mhi_qaic_ctrl.c b/drivers/accel/qaic/mhi_qaic_ctrl.c
deleted file mode 100644
index 0c7e571..0000000
--- a/drivers/accel/qaic/mhi_qaic_ctrl.c
+++ /dev/null
@@ -1,569 +0,0 @@
-// 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/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 {
-	u32 minor;
-	struct mhi_device *mhi_dev;
-	size_t mtu;
-	bool enabled;
-	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) {
-		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) {
-		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 ||
-				       mhi_get_free_desc_count(mqcdev->mhi_dev, DMA_TO_DEVICE) > 0);
-
-	if (!mqcdev->enabled)
-		return -ENODEV;
-
-	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)
-		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 || !list_empty(&mqcdev->dl_queue));
-
-	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)
-		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);
-		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
deleted file mode 100644
index 930b3ac..0000000
--- a/drivers/accel/qaic/mhi_qaic_ctrl.h
+++ /dev/null
@@ -1,12 +0,0 @@
-/* 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);
-
-#endif /* __MHI_QAIC_CTRL_H__ */
diff --git a/drivers/accel/qaic/qaic_drv.c b/drivers/accel/qaic/qaic_drv.c
index 1106ad8..ff80eb5 100644
--- a/drivers/accel/qaic/qaic_drv.c
+++ b/drivers/accel/qaic/qaic_drv.c
@@ -25,7 +25,6 @@
 #include <uapi/drm/qaic_accel.h>
 
 #include "mhi_controller.h"
-#include "mhi_qaic_ctrl.h"
 #include "qaic.h"
 
 MODULE_IMPORT_NS(DMA_BUF);
@@ -601,16 +600,8 @@ static int __init qaic_init(void)
 		goto free_mhi;
 	}
 
-	ret = mhi_qaic_ctrl_init();
-	if (ret) {
-		pr_debug("qaic: mhi_qaic_ctrl_init failed %d\n", ret);
-		goto free_pci;
-	}
-
 	return 0;
 
-free_pci:
-	pci_unregister_driver(&qaic_pci_driver);
 free_mhi:
 	mhi_driver_unregister(&qaic_mhi_driver);
 	return ret;
@@ -634,7 +625,6 @@ static void __exit qaic_exit(void)
 	 * reinitializing the link_up state after the cleanup is done.
 	 */
 	link_up = true;
-	mhi_qaic_ctrl_deinit();
 	pci_unregister_driver(&qaic_pci_driver);
 	mhi_driver_unregister(&qaic_mhi_driver);
 }
-- 
2.7.4

Re: [PATCH] Revert "accel/qaic: Add mhi_qaic_cntl"

[Jeffrey Hugo]

On 4/12/2023 7:57 AM, Jeffrey Hugo wrote:
> This reverts commit 566fc96198b4bb07ca6806386956669881225271.
> 
> This exposes a userspace API that is still under debate.  Revert the
> change before the uAPI gets exposed to avoid making a mistake.  QAIC is
> otherwise still functional.
> 
> Suggested-by: Daniel Vetter <daniel@ffwll.ch>
> Signed-off-by: Jeffrey Hugo <quic_jhugo@quicinc.com>
> Reviewed-by: Pranjal Ramajor Asha Kanojiya <quic_pkanojiy@quicinc.com>
> ---

Daniel,

Assuming you find this acceptable, would you please merge it?

Sorry, but I'm still working through an internal process for my drm-misc 
commit access.  I anticipate having that resolved prior to future changes.

-Jeff

Re: [PATCH] Revert "accel/qaic: Add mhi_qaic_cntl"

[Stanislaw Gruszka]

On Wed, Apr 12, 2023 at 07:57:44AM -0600, Jeffrey Hugo wrote:
> This reverts commit 566fc96198b4bb07ca6806386956669881225271.
> 
> This exposes a userspace API that is still under debate.  Revert the
> change before the uAPI gets exposed to avoid making a mistake.  QAIC is
> otherwise still functional.
> 
> Suggested-by: Daniel Vetter <daniel@ffwll.ch>
> Signed-off-by: Jeffrey Hugo <quic_jhugo@quicinc.com>
> Reviewed-by: Pranjal Ramajor Asha Kanojiya <quic_pkanojiy@quicinc.com>
Reviewed-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com>

Re: [PATCH] Revert "accel/qaic: Add mhi_qaic_cntl"

[Daniel Vetter]

On Wed, Apr 12, 2023 at 08:00:33AM -0600, Jeffrey Hugo wrote:
> On 4/12/2023 7:57 AM, Jeffrey Hugo wrote:
> > This reverts commit 566fc96198b4bb07ca6806386956669881225271.
> > 
> > This exposes a userspace API that is still under debate.  Revert the
> > change before the uAPI gets exposed to avoid making a mistake.  QAIC is
> > otherwise still functional.
> > 
> > Suggested-by: Daniel Vetter <daniel@ffwll.ch>
> > Signed-off-by: Jeffrey Hugo <quic_jhugo@quicinc.com>
> > Reviewed-by: Pranjal Ramajor Asha Kanojiya <quic_pkanojiy@quicinc.com>
> > ---
> 
> Daniel,
> 
> Assuming you find this acceptable, would you please merge it?
> 
> Sorry, but I'm still working through an internal process for my drm-misc
> commit access.  I anticipate having that resolved prior to future changes.

It should be pushed to drm-misc-next-fixes (but that's not yet ready, I
pinged Maarten).

Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>

Ack from Greg/Oded would be good too for completeness.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

Re: [PATCH] Revert "accel/qaic: Add mhi_qaic_cntl"

[Greg KH]

On Wed, Apr 12, 2023 at 07:57:44AM -0600, Jeffrey Hugo wrote:
> This reverts commit 566fc96198b4bb07ca6806386956669881225271.
> 
> This exposes a userspace API that is still under debate.  Revert the
> change before the uAPI gets exposed to avoid making a mistake.  QAIC is
> otherwise still functional.
> 
> Suggested-by: Daniel Vetter <daniel@ffwll.ch>
> Signed-off-by: Jeffrey Hugo <quic_jhugo@quicinc.com>
> Reviewed-by: Pranjal Ramajor Asha Kanojiya <quic_pkanojiy@quicinc.com>

Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

And can you cc: me when you resubmit this?  It's not really correct in a
number of places and can be made simpler if you really want to have your
own class and device major.

thanks,

greg k-h

Re: [PATCH] Revert "accel/qaic: Add mhi_qaic_cntl"

[Daniel Vetter]

On Wed, Apr 12, 2023 at 04:05:42PM +0200, Stanislaw Gruszka wrote:
> On Wed, Apr 12, 2023 at 07:57:44AM -0600, Jeffrey Hugo wrote:
> > This reverts commit 566fc96198b4bb07ca6806386956669881225271.
> > 
> > This exposes a userspace API that is still under debate.  Revert the
> > change before the uAPI gets exposed to avoid making a mistake.  QAIC is
> > otherwise still functional.
> > 
> > Suggested-by: Daniel Vetter <daniel@ffwll.ch>
> > Signed-off-by: Jeffrey Hugo <quic_jhugo@quicinc.com>
> > Reviewed-by: Pranjal Ramajor Asha Kanojiya <quic_pkanojiy@quicinc.com>
> Reviewed-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com>

I think Ack from Oded would be good (but iirc there's some holidays going
on), but I guess Greg's is good enough. Can you pls push this to
drm-misc-next-fixes (it's open now for merge window fixes) since Jeff
isn't set up yet?

Thanks, Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

Re: [PATCH] Revert "accel/qaic: Add mhi_qaic_cntl"

[Daniel Vetter]

On Wed, Apr 12, 2023 at 07:15:43PM +0200, Greg KH wrote:
> On Wed, Apr 12, 2023 at 07:57:44AM -0600, Jeffrey Hugo wrote:
> > This reverts commit 566fc96198b4bb07ca6806386956669881225271.
> > 
> > This exposes a userspace API that is still under debate.  Revert the
> > change before the uAPI gets exposed to avoid making a mistake.  QAIC is
> > otherwise still functional.
> > 
> > Suggested-by: Daniel Vetter <daniel@ffwll.ch>
> > Signed-off-by: Jeffrey Hugo <quic_jhugo@quicinc.com>
> > Reviewed-by: Pranjal Ramajor Asha Kanojiya <quic_pkanojiy@quicinc.com>
> 
> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> 
> And can you cc: me when you resubmit this?  It's not really correct in a
> number of places and can be made simpler if you really want to have your
> own class and device major.

+1 on this, in the other thread my take was that this should go through
driver model tree in the mhi bus, and I guess needs some review there
about safety and all that. We do a lot of funny uapi in drm/accel, but
full generic driver-in-userspace is really not our thing :-)

I guess there's also the question whether this should be debugfs (like the
usb stuff, or did that move by now) or real chardev. Might also make sense
to integrate with vfio/mdev/iommufd depending how the security model
works.

But really this is all stuff where I'm hightailing it asap :-)
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

Re: [PATCH] Revert "accel/qaic: Add mhi_qaic_cntl"

[Jacek Lawrynowicz]

Hi, 

On 13.04.2023 10:49, Daniel Vetter wrote:
> On Wed, Apr 12, 2023 at 04:05:42PM +0200, Stanislaw Gruszka wrote:
>> On Wed, Apr 12, 2023 at 07:57:44AM -0600, Jeffrey Hugo wrote:
>>> This reverts commit 566fc96198b4bb07ca6806386956669881225271.
>>>
>>> This exposes a userspace API that is still under debate.  Revert the
>>> change before the uAPI gets exposed to avoid making a mistake.  QAIC is
>>> otherwise still functional.
>>>
>>> Suggested-by: Daniel Vetter <daniel@ffwll.ch>
>>> Signed-off-by: Jeffrey Hugo <quic_jhugo@quicinc.com>
>>> Reviewed-by: Pranjal Ramajor Asha Kanojiya <quic_pkanojiy@quicinc.com>
>> Reviewed-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com>
> 
> I think Ack from Oded would be good (but iirc there's some holidays going
> on), but I guess Greg's is good enough. Can you pls push this to
> drm-misc-next-fixes (it's open now for merge window fixes) since Jeff
> isn't set up yet?
> 

I've pushed this revert to drm-misc-next-fixes.

Regards,
Jacek