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

[Jacek Lawrynowicz]

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 :)

Regards,
Jacek