Re: [PATCH] accel/qaic: Add Sahara implementation for firmware loading

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Reviewed-by: Jacek Lawrynowicz <jacek.lawrynowicz@xxxxxxxxxxxxxxx>

On 22.03.2024 04:49, Jeffrey Hugo wrote:
> The AIC100 secondary bootloader uses the Sahara protocol for two
> purposes - loading the runtime firmware images from the host, and
> offloading crashdumps to the host. The crashdump functionality is only
> invoked when the AIC100 device encounters a crash and dumps are enabled.
> Also the collection of the dump is optional - the host can reject
> collecting the dump.
> 
> The Sahara protocol contains many features and modes including firmware
> upload, crashdump download, and client commands. For simplicity,
> implement the parts of the protocol needed for loading firmware to the
> device.
> 
> Fundamentally, the Sahara protocol is an embedded file transfer
> protocol. Both sides negotiate a connection through a simple exchange of
> hello messages. After handshaking through a hello message, the device
> either sends a message requesting images, or a message advertising the
> memory dump available for the host. For image transfer, the remote device
> issues a read data request that provides an image (by ID), an offset, and
> a length. The host has an internal mapping of image IDs to filenames. The
> host is expected to access the image and transfer the requested chunk to
> the device. The device can issue additional read requests, or signal that
> it has consumed enough data from this image with an end of image message.
> The host confirms the end of image, and the device can proceed with
> another image by starting over with the hello exchange again.
> 
> Some images may be optional, and only provided as part of a provisioning
> flow. The host is not aware of this information, and thus should report
> an error to the device when an image is not available. The device will
> evaluate if the image is required or not, and take the appropriate
> action.
> 
> Signed-off-by: Jeffrey Hugo <quic_jhugo@xxxxxxxxxxx>
> Reviewed-by: Carl Vanderlip <quic_carlv@xxxxxxxxxxx>
> Reviewed-by: Pranjal Ramajor Asha Kanojiya <quic_pkanojiy@xxxxxxxxxxx>
> ---
> 
>  drivers/accel/qaic/Makefile   |   3 +-
>  drivers/accel/qaic/qaic_drv.c |  10 +
>  drivers/accel/qaic/sahara.c   | 450 ++++++++++++++++++++++++++++++++++
>  drivers/accel/qaic/sahara.h   |  10 +
>  4 files changed, 472 insertions(+), 1 deletion(-)
>  create mode 100644 drivers/accel/qaic/sahara.c
>  create mode 100644 drivers/accel/qaic/sahara.h
> 
> diff --git a/drivers/accel/qaic/Makefile b/drivers/accel/qaic/Makefile
> index 3f7f6dfde7f2..df02c1c0d6a6 100644
> --- a/drivers/accel/qaic/Makefile
> +++ b/drivers/accel/qaic/Makefile
> @@ -10,4 +10,5 @@ qaic-y := \
>  	qaic_control.o \
>  	qaic_data.o \
>  	qaic_drv.o \
> -	qaic_timesync.o
> +	qaic_timesync.o \
> +	sahara.o
> diff --git a/drivers/accel/qaic/qaic_drv.c b/drivers/accel/qaic/qaic_drv.c
> index d1a632dbaec6..ccfbac88c724 100644
> --- a/drivers/accel/qaic/qaic_drv.c
> +++ b/drivers/accel/qaic/qaic_drv.c
> @@ -29,6 +29,7 @@
>  #include "mhi_controller.h"
>  #include "qaic.h"
>  #include "qaic_timesync.h"
> +#include "sahara.h"
>  
>  MODULE_IMPORT_NS(DMA_BUF);
>  
> @@ -635,12 +636,20 @@ static int __init qaic_init(void)
>  		goto free_pci;
>  	}
>  
> +	ret = sahara_register();
> +	if (ret) {
> +		pr_debug("qaic: sahara_register failed %d\n", ret);
> +		goto free_mhi;
> +	}
> +
>  	ret = qaic_timesync_init();
>  	if (ret)
>  		pr_debug("qaic: qaic_timesync_init failed %d\n", ret);
>  
>  	return 0;
>  
> +free_mhi:
> +	mhi_driver_unregister(&qaic_mhi_driver);
>  free_pci:
>  	pci_unregister_driver(&qaic_pci_driver);
>  	return ret;
> @@ -665,6 +674,7 @@ static void __exit qaic_exit(void)
>  	 */
>  	link_up = true;
>  	qaic_timesync_deinit();
> +	sahara_unregister();
>  	mhi_driver_unregister(&qaic_mhi_driver);
>  	pci_unregister_driver(&qaic_pci_driver);
>  }
> diff --git a/drivers/accel/qaic/sahara.c b/drivers/accel/qaic/sahara.c
> new file mode 100644
> index 000000000000..d5da8e166998
> --- /dev/null
> +++ b/drivers/accel/qaic/sahara.c
> @@ -0,0 +1,450 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +
> +/* Copyright (c) 2024 Qualcomm Innovation Center, Inc. All rights reserved. */
> +
> +#include <linux/firmware.h>
> +#include <linux/limits.h>
> +#include <linux/mhi.h>
> +#include <linux/minmax.h>
> +#include <linux/mod_devicetable.h>
> +#include <linux/overflow.h>
> +#include <linux/types.h>
> +#include <linux/workqueue.h>
> +
> +#include "sahara.h"
> +
> +#define SAHARA_HELLO_CMD		0x1  /* Min protocol version 1.0 */
> +#define SAHARA_HELLO_RESP_CMD		0x2  /* Min protocol version 1.0 */
> +#define SAHARA_READ_DATA_CMD		0x3  /* Min protocol version 1.0 */
> +#define SAHARA_END_OF_IMAGE_CMD		0x4  /* Min protocol version 1.0 */
> +#define SAHARA_DONE_CMD			0x5  /* Min protocol version 1.0 */
> +#define SAHARA_DONE_RESP_CMD		0x6  /* Min protocol version 1.0 */
> +#define SAHARA_RESET_CMD		0x7  /* Min protocol version 1.0 */
> +#define SAHARA_RESET_RESP_CMD		0x8  /* Min protocol version 1.0 */
> +#define SAHARA_MEM_DEBUG_CMD		0x9  /* Min protocol version 2.0 */
> +#define SAHARA_MEM_READ_CMD		0xa  /* Min protocol version 2.0 */
> +#define SAHARA_CMD_READY_CMD		0xb  /* Min protocol version 2.1 */
> +#define SAHARA_SWITCH_MODE_CMD		0xc  /* Min protocol version 2.1 */
> +#define SAHARA_EXECUTE_CMD		0xd  /* Min protocol version 2.1 */
> +#define SAHARA_EXECUTE_RESP_CMD		0xe  /* Min protocol version 2.1 */
> +#define SAHARA_EXECUTE_DATA_CMD		0xf  /* Min protocol version 2.1 */
> +#define SAHARA_MEM_DEBUG64_CMD		0x10 /* Min protocol version 2.5 */
> +#define SAHARA_MEM_READ64_CMD		0x11 /* Min protocol version 2.5 */
> +#define SAHARA_READ_DATA64_CMD		0x12 /* Min protocol version 2.8 */
> +#define SAHARA_RESET_STATE_CMD		0x13 /* Min protocol version 2.9 */
> +#define SAHARA_WRITE_DATA_CMD		0x14 /* Min protocol version 3.0 */
> +
> +#define SAHARA_PACKET_MAX_SIZE		0xffffU /* MHI_MAX_MTU */
> +#define SAHARA_TRANSFER_MAX_SIZE	0x80000
> +#define SAHARA_NUM_TX_BUF		DIV_ROUND_UP(SAHARA_TRANSFER_MAX_SIZE,\
> +							SAHARA_PACKET_MAX_SIZE)
> +#define SAHARA_IMAGE_ID_NONE		U32_MAX
> +
> +#define SAHARA_VERSION			2
> +#define SAHARA_SUCCESS			0
> +
> +#define SAHARA_MODE_IMAGE_TX_PENDING	0x0
> +#define SAHARA_MODE_IMAGE_TX_COMPLETE	0x1
> +#define SAHARA_MODE_MEMORY_DEBUG	0x2
> +#define SAHARA_MODE_COMMAND		0x3
> +
> +#define SAHARA_HELLO_LENGTH		0x30
> +#define SAHARA_READ_DATA_LENGTH		0x14
> +#define SAHARA_END_OF_IMAGE_LENGTH	0x10
> +#define SAHARA_DONE_LENGTH		0x8
> +#define SAHARA_RESET_LENGTH		0x8
> +
> +struct sahara_packet {
> +	__le32 cmd;
> +	__le32 length;
> +
> +	union {
> +		struct {
> +			__le32 version;
> +			__le32 version_compat;
> +			__le32 max_length;
> +			__le32 mode;
> +		} hello;
> +		struct {
> +			__le32 version;
> +			__le32 version_compat;
> +			__le32 status;
> +			__le32 mode;
> +		} hello_resp;
> +		struct {
> +			__le32 image;
> +			__le32 offset;
> +			__le32 length;
> +		} read_data;
> +		struct {
> +			__le32 image;
> +			__le32 status;
> +		} end_of_image;
> +	};
> +};
> +
> +struct sahara_context {
> +	struct sahara_packet		*tx[SAHARA_NUM_TX_BUF];
> +	struct sahara_packet		*rx;
> +	struct work_struct		work;
> +	struct mhi_device		*mhi_dev;
> +	const char			**image_table;
> +	u32				table_size;
> +	u32				active_image_id;
> +	const struct firmware		*firmware;
> +};
> +
> +static const char *aic100_image_table[] = {
> +	[1]  = "qcom/aic100/fw1.bin",
> +	[2]  = "qcom/aic100/fw2.bin",
> +	[4]  = "qcom/aic100/fw4.bin",
> +	[5]  = "qcom/aic100/fw5.bin",
> +	[6]  = "qcom/aic100/fw6.bin",
> +	[8]  = "qcom/aic100/fw8.bin",
> +	[9]  = "qcom/aic100/fw9.bin",
> +	[10] = "qcom/aic100/fw10.bin",
> +};
> +
> +static int sahara_find_image(struct sahara_context *context, u32 image_id)
> +{
> +	int ret;
> +
> +	if (image_id == context->active_image_id)
> +		return 0;
> +
> +	if (context->active_image_id != SAHARA_IMAGE_ID_NONE) {
> +		dev_err(&context->mhi_dev->dev, "image id %d is not valid as %d is active\n",
> +			image_id, context->active_image_id);
> +		return -EINVAL;
> +	}
> +
> +	if (image_id >= context->table_size || !context->image_table[image_id]) {
> +		dev_err(&context->mhi_dev->dev, "request for unknown image: %d\n", image_id);
> +		return -EINVAL;
> +	}
> +
> +	/*
> +	 * This image might be optional. The device may continue without it.
> +	 * Only the device knows. Suppress error messages that could suggest an
> +	 * a problem when we were actually able to continue.
> +	 */
> +	ret = firmware_request_nowarn(&context->firmware,
> +				      context->image_table[image_id],
> +				      &context->mhi_dev->dev);
> +	if (ret) {
> +		dev_dbg(&context->mhi_dev->dev, "request for image id %d / file %s failed %d\n",
> +			image_id, context->image_table[image_id], ret);
> +		return ret;
> +	}
> +
> +	context->active_image_id = image_id;
> +
> +	return 0;
> +}
> +
> +static void sahara_release_image(struct sahara_context *context)
> +{
> +	if (context->active_image_id != SAHARA_IMAGE_ID_NONE)
> +		release_firmware(context->firmware);
> +	context->active_image_id = SAHARA_IMAGE_ID_NONE;
> +}
> +
> +static void sahara_send_reset(struct sahara_context *context)
> +{
> +	int ret;
> +
> +	context->tx[0]->cmd = cpu_to_le32(SAHARA_RESET_CMD);
> +	context->tx[0]->length = cpu_to_le32(SAHARA_RESET_LENGTH);
> +
> +	ret = mhi_queue_buf(context->mhi_dev, DMA_TO_DEVICE, context->tx[0],
> +			    SAHARA_RESET_LENGTH, MHI_EOT);
> +	if (ret)
> +		dev_err(&context->mhi_dev->dev, "Unable to send reset response %d\n", ret);
> +}
> +
> +static void sahara_hello(struct sahara_context *context)
> +{
> +	int ret;
> +
> +	dev_dbg(&context->mhi_dev->dev,
> +		"HELLO cmd received. length:%d version:%d version_compat:%d max_length:%d mode:%d\n",
> +		le32_to_cpu(context->rx->length),
> +		le32_to_cpu(context->rx->hello.version),
> +		le32_to_cpu(context->rx->hello.version_compat),
> +		le32_to_cpu(context->rx->hello.max_length),
> +		le32_to_cpu(context->rx->hello.mode));
> +
> +	if (le32_to_cpu(context->rx->length) != SAHARA_HELLO_LENGTH) {
> +		dev_err(&context->mhi_dev->dev, "Malformed hello packet - length %d\n",
> +			le32_to_cpu(context->rx->length));
> +		return;
> +	}
> +	if (le32_to_cpu(context->rx->hello.version) != SAHARA_VERSION) {
> +		dev_err(&context->mhi_dev->dev, "Unsupported hello packet - version %d\n",
> +			le32_to_cpu(context->rx->hello.version));
> +		return;
> +	}
> +
> +	if (le32_to_cpu(context->rx->hello.mode) != SAHARA_MODE_IMAGE_TX_PENDING &&
> +	    le32_to_cpu(context->rx->hello.mode) != SAHARA_MODE_IMAGE_TX_COMPLETE) {
> +		dev_err(&context->mhi_dev->dev, "Unsupported hello packet - mode %d\n",
> +			le32_to_cpu(context->rx->hello.mode));
> +		return;
> +	}
> +
> +	context->tx[0]->cmd = cpu_to_le32(SAHARA_HELLO_RESP_CMD);
> +	context->tx[0]->length = cpu_to_le32(SAHARA_HELLO_LENGTH);
> +	context->tx[0]->hello_resp.version = cpu_to_le32(SAHARA_VERSION);
> +	context->tx[0]->hello_resp.version_compat = cpu_to_le32(SAHARA_VERSION);
> +	context->tx[0]->hello_resp.status = cpu_to_le32(SAHARA_SUCCESS);
> +	context->tx[0]->hello_resp.mode = context->rx->hello_resp.mode;
> +
> +	ret = mhi_queue_buf(context->mhi_dev, DMA_TO_DEVICE, context->tx[0],
> +			    SAHARA_HELLO_LENGTH, MHI_EOT);
> +	if (ret)
> +		dev_err(&context->mhi_dev->dev, "Unable to send hello response %d\n", ret);
> +}
> +
> +static void sahara_read_data(struct sahara_context *context)
> +{
> +	u32 image_id, data_offset, data_len, pkt_data_len;
> +	int ret;
> +	int i;
> +
> +	dev_dbg(&context->mhi_dev->dev,
> +		"READ_DATA cmd received. length:%d image:%d offset:%d data_length:%d\n",
> +		le32_to_cpu(context->rx->length),
> +		le32_to_cpu(context->rx->read_data.image),
> +		le32_to_cpu(context->rx->read_data.offset),
> +		le32_to_cpu(context->rx->read_data.length));
> +
> +	if (le32_to_cpu(context->rx->length) != SAHARA_READ_DATA_LENGTH) {
> +		dev_err(&context->mhi_dev->dev, "Malformed read_data packet - length %d\n",
> +			le32_to_cpu(context->rx->length));
> +		return;
> +	}
> +
> +	image_id = le32_to_cpu(context->rx->read_data.image);
> +	data_offset = le32_to_cpu(context->rx->read_data.offset);
> +	data_len = le32_to_cpu(context->rx->read_data.length);
> +
> +	ret = sahara_find_image(context, image_id);
> +	if (ret) {
> +		sahara_send_reset(context);
> +		return;
> +	}
> +
> +	/*
> +	 * Image is released when the device is done with it via
> +	 * SAHARA_END_OF_IMAGE_CMD. sahara_send_reset() will either cause the
> +	 * device to retry the operation with a modification, or decide to be
> +	 * done with the image and trigger SAHARA_END_OF_IMAGE_CMD.
> +	 * release_image() is called from SAHARA_END_OF_IMAGE_CMD. processing
> +	 * and is not needed here on error.
> +	 */
> +
> +	if (data_len > SAHARA_TRANSFER_MAX_SIZE) {
> +		dev_err(&context->mhi_dev->dev, "Malformed read_data packet - data len %d exceeds max xfer size %d\n",
> +			data_len, SAHARA_TRANSFER_MAX_SIZE);
> +		sahara_send_reset(context);
> +		return;
> +	}
> +
> +	if (data_offset >= context->firmware->size) {
> +		dev_err(&context->mhi_dev->dev, "Malformed read_data packet - data offset %d exceeds file size %zu\n",
> +			data_offset, context->firmware->size);
> +		sahara_send_reset(context);
> +		return;
> +	}
> +
> +	if (size_add(data_offset, data_len) > context->firmware->size) {
> +		dev_err(&context->mhi_dev->dev, "Malformed read_data packet - data offset %d and length %d exceeds file size %zu\n",
> +			data_offset, data_len, context->firmware->size);
> +		sahara_send_reset(context);
> +		return;
> +	}
> +
> +	for (i = 0; i < SAHARA_NUM_TX_BUF && data_len; ++i) {
> +		pkt_data_len = min(data_len, SAHARA_PACKET_MAX_SIZE);
> +
> +		memcpy(context->tx[i], &context->firmware->data[data_offset], pkt_data_len);
> +
> +		data_offset += pkt_data_len;
> +		data_len -= pkt_data_len;
> +
> +		ret = mhi_queue_buf(context->mhi_dev, DMA_TO_DEVICE,
> +				    context->tx[i], pkt_data_len,
> +				    !data_len ? MHI_EOT : MHI_CHAIN);
> +		if (ret) {
> +			dev_err(&context->mhi_dev->dev, "Unable to send read_data response %d\n",
> +				ret);
> +			return;
> +		}
> +	}
> +}
> +
> +static void sahara_end_of_image(struct sahara_context *context)
> +{
> +	int ret;
> +
> +	dev_dbg(&context->mhi_dev->dev,
> +		"END_OF_IMAGE cmd received. length:%d image:%d status:%d\n",
> +		le32_to_cpu(context->rx->length),
> +		le32_to_cpu(context->rx->end_of_image.image),
> +		le32_to_cpu(context->rx->end_of_image.status));
> +
> +	if (le32_to_cpu(context->rx->length) != SAHARA_END_OF_IMAGE_LENGTH) {
> +		dev_err(&context->mhi_dev->dev, "Malformed end_of_image packet - length %d\n",
> +			le32_to_cpu(context->rx->length));
> +		return;
> +	}
> +
> +	if (context->active_image_id != SAHARA_IMAGE_ID_NONE &&
> +	    le32_to_cpu(context->rx->end_of_image.image) != context->active_image_id) {
> +		dev_err(&context->mhi_dev->dev, "Malformed end_of_image packet - image %d is not the active image\n",
> +			le32_to_cpu(context->rx->end_of_image.image));
> +		return;
> +	}
> +
> +	sahara_release_image(context);
> +
> +	if (le32_to_cpu(context->rx->end_of_image.status))
> +		return;
> +
> +	context->tx[0]->cmd = cpu_to_le32(SAHARA_DONE_CMD);
> +	context->tx[0]->length = cpu_to_le32(SAHARA_DONE_LENGTH);
> +
> +	ret = mhi_queue_buf(context->mhi_dev, DMA_TO_DEVICE, context->tx[0],
> +			    SAHARA_DONE_LENGTH, MHI_EOT);
> +	if (ret)
> +		dev_dbg(&context->mhi_dev->dev, "Unable to send done response %d\n", ret);
> +}
> +
> +static void sahara_processing(struct work_struct *work)
> +{
> +	struct sahara_context *context = container_of(work, struct sahara_context, work);
> +	int ret;
> +
> +	switch (le32_to_cpu(context->rx->cmd)) {
> +	case SAHARA_HELLO_CMD:
> +		sahara_hello(context);
> +		break;
> +	case SAHARA_READ_DATA_CMD:
> +		sahara_read_data(context);
> +		break;
> +	case SAHARA_END_OF_IMAGE_CMD:
> +		sahara_end_of_image(context);
> +		break;
> +	case SAHARA_DONE_RESP_CMD:
> +		/* Intentional do nothing as we don't need to exit an app */
> +		break;
> +	default:
> +		dev_err(&context->mhi_dev->dev, "Unknown command %d\n",
> +			le32_to_cpu(context->rx->cmd));
> +		break;
> +	}
> +
> +	ret = mhi_queue_buf(context->mhi_dev, DMA_FROM_DEVICE, context->rx,
> +			    SAHARA_PACKET_MAX_SIZE, MHI_EOT);
> +	if (ret)
> +		dev_err(&context->mhi_dev->dev, "Unable to requeue rx buf %d\n", ret);
> +}
> +
> +static int sahara_mhi_probe(struct mhi_device *mhi_dev, const struct mhi_device_id *id)
> +{
> +	struct sahara_context *context;
> +	int ret;
> +	int i;
> +
> +	context = devm_kzalloc(&mhi_dev->dev, sizeof(*context), GFP_KERNEL);
> +	if (!context)
> +		return -ENOMEM;
> +
> +	context->rx = devm_kzalloc(&mhi_dev->dev, SAHARA_PACKET_MAX_SIZE, GFP_KERNEL);
> +	if (!context->rx)
> +		return -ENOMEM;
> +
> +	/*
> +	 * AIC100 defines SAHARA_TRANSFER_MAX_SIZE as the largest value it
> +	 * will request for READ_DATA. This is larger than
> +	 * SAHARA_PACKET_MAX_SIZE, and we need 9x SAHARA_PACKET_MAX_SIZE to
> +	 * cover SAHARA_TRANSFER_MAX_SIZE. When the remote side issues a
> +	 * READ_DATA, it requires a transfer of the exact size requested. We
> +	 * can use MHI_CHAIN to link multiple buffers into a single transfer
> +	 * but the remote side will not consume the buffers until it sees an
> +	 * EOT, thus we need to allocate enough buffers to put in the tx fifo
> +	 * to cover an entire READ_DATA request of the max size.
> +	 */
> +	for (i = 0; i < SAHARA_NUM_TX_BUF; ++i) {
> +		context->tx[i] = devm_kzalloc(&mhi_dev->dev, SAHARA_PACKET_MAX_SIZE, GFP_KERNEL);
> +		if (!context->tx[i])
> +			return -ENOMEM;
> +	}
> +
> +	context->mhi_dev = mhi_dev;
> +	INIT_WORK(&context->work, sahara_processing);
> +	context->image_table = aic100_image_table;
> +	context->table_size = ARRAY_SIZE(aic100_image_table);
> +	context->active_image_id = SAHARA_IMAGE_ID_NONE;
> +	dev_set_drvdata(&mhi_dev->dev, context);
> +
> +	ret = mhi_prepare_for_transfer(mhi_dev);
> +	if (ret)
> +		return ret;
> +
> +	ret = mhi_queue_buf(mhi_dev, DMA_FROM_DEVICE, context->rx, SAHARA_PACKET_MAX_SIZE, MHI_EOT);
> +	if (ret) {
> +		mhi_unprepare_from_transfer(mhi_dev);
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +static void sahara_mhi_remove(struct mhi_device *mhi_dev)
> +{
> +	struct sahara_context *context = dev_get_drvdata(&mhi_dev->dev);
> +
> +	cancel_work_sync(&context->work);
> +	sahara_release_image(context);
> +	mhi_unprepare_from_transfer(mhi_dev);
> +}
> +
> +static void sahara_mhi_ul_xfer_cb(struct mhi_device *mhi_dev, struct mhi_result *mhi_result)
> +{
> +}
> +
> +static void sahara_mhi_dl_xfer_cb(struct mhi_device *mhi_dev, struct mhi_result *mhi_result)
> +{
> +	struct sahara_context *context = dev_get_drvdata(&mhi_dev->dev);
> +
> +	if (!mhi_result->transaction_status)
> +		schedule_work(&context->work);
> +}
> +
> +static const struct mhi_device_id sahara_mhi_match_table[] = {
> +	{ .chan = "QAIC_SAHARA", },
> +	{},
> +};
> +
> +static struct mhi_driver sahara_mhi_driver = {
> +	.id_table = sahara_mhi_match_table,
> +	.remove = sahara_mhi_remove,
> +	.probe = sahara_mhi_probe,
> +	.ul_xfer_cb = sahara_mhi_ul_xfer_cb,
> +	.dl_xfer_cb = sahara_mhi_dl_xfer_cb,
> +	.driver = {
> +		.name = "sahara",
> +	},
> +};
> +
> +int sahara_register(void)
> +{
> +	return mhi_driver_register(&sahara_mhi_driver);
> +}
> +
> +void sahara_unregister(void)
> +{
> +	mhi_driver_unregister(&sahara_mhi_driver);
> +}
> diff --git a/drivers/accel/qaic/sahara.h b/drivers/accel/qaic/sahara.h
> new file mode 100644
> index 000000000000..640208acc0d1
> --- /dev/null
> +++ b/drivers/accel/qaic/sahara.h
> @@ -0,0 +1,10 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +
> +/* Copyright (c) 2024 Qualcomm Innovation Center, Inc. All rights reserved. */
> +
> +#ifndef __SAHARA_H__
> +#define __SAHARA_H__
> +
> +int sahara_register(void);
> +void sahara_unregister(void);
> +#endif /* __SAHARA_H__ */



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