[PATCH v4 6/8] accel/qaic: Add mhi_qaic_cntl

[Jeffrey Hugo]

On 3/22/2023 2:11 AM, Jacek Lawrynowicz wrote:
> Reviewed-by: Jacek Lawrynowicz <jacek.lawrynowicz at linux.intel.com>
> 
> Hi,
> 
> On 20.03.2023 20:06, Jeffrey Hugo wrote:
>> On 3/20/2023 9:11 AM, Jeffrey Hugo wrote:
>>> From: Pranjal Ramajor Asha Kanojiya <quic_pkanojiy at quicinc.com>
>>>
>>> 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 at quicinc.com>
>>> Signed-off-by: Jeffrey Hugo <quic_jhugo at quicinc.com>
>>> Reviewed-by: Carl Vanderlip <quic_carlv at quicinc.com>
>>> Reviewed-by: Stanislaw Gruszka <stanislaw.gruszka at linux.intel.com>
>>> ---
>>>    drivers/accel/qaic/mhi_qaic_ctrl.c | 571 +++++++++++++++++++++++++++++++++++++
>>>    drivers/accel/qaic/mhi_qaic_ctrl.h |  12 +
>>>    2 files changed, 583 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..a46ba1d
>>> --- /dev/null
>>> +++ b/drivers/accel/qaic/mhi_qaic_ctrl.c
>>> @@ -0,0 +1,571 @@
>>> +// 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>
>>
>> Will remove this.
>>
>> Jacek, I think I've got all of your comments addressed.  Do you see anything more?  I'm hopeful that we are just looking at one more spin.
> 
> Yeah, I don't have any additional comments.
> The whole patchset looks OK to me :)

Thanks for the review.  I appreciate the constructive feedback.

-Jeff