linux-kernel - Re: [PATCH v8 3/9] firmware: arm_scmi: Add notification dispatch and delivery

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Message-ID: <20200608170346.GD13622@bogus>
Date:   Mon, 8 Jun 2020 18:03:46 +0100
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,
        Jonathan.Cameron@...wei.com, dave.martin@....com,
        Sudeep Holla <sudeep.holla@....com>
Subject: Re: [PATCH v8 3/9] firmware: arm_scmi: Add notification dispatch and
 delivery

On Wed, May 20, 2020 at 09:11:12AM +0100, Cristian Marussi wrote:
> Add core SCMI Notifications dispatch and delivery support logic which is
> able, at first, to dispatch well-known received events from the RX ISR to
> the dedicated deferred worker, and then, from there, to final deliver the
> events to the registered users' callbacks.
> 
> Dispatch and delivery is just added here, still not enabled.
> 
> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> Signed-off-by: Cristian Marussi <cristian.marussi@....com>
> ---
>  drivers/firmware/arm_scmi/notify.c | 354 ++++++++++++++++++++++++++++-
>  drivers/firmware/arm_scmi/notify.h |  10 +
>  2 files changed, 362 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/firmware/arm_scmi/notify.c b/drivers/firmware/arm_scmi/notify.c
> index 7cf61dbe2a8e..d582f71fde5b 100644
> --- a/drivers/firmware/arm_scmi/notify.c
> +++ b/drivers/firmware/arm_scmi/notify.c

[...]

> @@ -1085,6 +1422,12 @@ int scmi_notification_init(struct scmi_handle *handle)
>  	ni->gid = gid;
>  	ni->handle = handle;
>  
> +	ni->notify_wq = alloc_workqueue("scmi_notify",
> +					WQ_UNBOUND | WQ_FREEZABLE | WQ_SYSFS,
> +					0);

What's the use of WQ_SYSFS for SCMI notifications ? Do we need it ?

-- 
Regards,
Sudeep