linux-kernel - Re: [PATCH v2 1/1] firmware: arm_scmi: Add SCMI System Power Control driver

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Date:   Thu, 12 Nov 2020 14:57:44 +0000
From:   Sudeep Holla <sudeep.holla@....com>
To:     Cristian Marussi <cristian.marussi@....com>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        lukasz.luba@....com, james.quinlan@...adcom.com,
        Sudeep Holla <sudeep.holla@....com>,
        Jonathan.Cameron@...wei.com
Subject: Re: [PATCH v2 1/1] firmware: arm_scmi: Add SCMI System Power Control
 driver

On Mon, Oct 26, 2020 at 08:55:31PM +0000, Cristian Marussi wrote:
> Add an SCMI System Power control driver to handle platform's requests
> carried by SYSTEM_POWER_STATE_NOTIFIER notifications: such platform
> requested system power state transitions are handled accordingly,
> gracefully or forcefully, depending on the notifications' message flags.
> 
> Graceful requests are by default relayed to userspace using the same
> Kernel API used to handle ACPI Shutdown bus events: alternatively, instead,
> a few available module parameters can be used to tunnel instead such
> requests to userspace via signals addressed to CAD pid.
> 
> When handling graceful requests, grant userspace processes a maximum
> (configurable) time to perform their duties and then revert to a forceful
> transition, so avoiding completely timing out platform's maximum grace time
> and hitting possible abrupt power-cuts.
> 
> Signed-off-by: Cristian Marussi <cristian.marussi@....com>
> ---
>  drivers/firmware/Kconfig                      |  12 +
>  drivers/firmware/arm_scmi/Makefile            |   1 +
>  .../firmware/arm_scmi/scmi_power_control.c    | 387 ++++++++++++++++++
>  3 files changed, 400 insertions(+)
>  create mode 100644 drivers/firmware/arm_scmi/scmi_power_control.c
>

[nit] Since you have just one patch, it is generally preferred to place
all the extra non commit messages here after diff stat to have a single
thread of discussion.

Anyways, probably ccing Arnd/Greg/or anyone who has made some feature
changes in this area(e.g. kernel/reboot.c) might help to get some useful
feedback here.

-- 
Regards,
Sudeep