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Re: [RFC v1 3/5] xen/arm: introduce SCMI-SMC mediator driver
- To: Julien Grall <julien@xxxxxxx>
- From: Oleksii Moisieiev <Oleksii_Moisieiev@xxxxxxxx>
- Date: Fri, 24 Dec 2021 13:59:09 +0000
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>
- Delivery-date: Fri, 24 Dec 2021 13:59:33 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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- Thread-topic: [RFC v1 3/5] xen/arm: introduce SCMI-SMC mediator driver
Hi Julien,
On Fri, Dec 24, 2021 at 02:29:13PM +0100, Julien Grall wrote:
> Hi,
>
> On 24/12/2021 01:16, Stefano Stabellini wrote:
> > > One more question: As you probably seen - Jan had a complains about SCI
> > > term. He said SCI is ambiguous with ACPI's System
> > > Control Interrupt.
> >
> > I see his point. As a term I see "SCMI" often and sometimes "SCPI" but
> > "SCI" is the first time I saw it with this patch series.
> >
> >
> > > I think of using SC (as System Control) instead. What do you think
> > > about it?
> >
> > Yeah, I am not great at naming things but maybe "ARM_SCI"? "SC" alone
> > doesn't give me enough context to guess what it is.
>
> I might be missing some context. Why are naming everything SCI rather than
> SMCI?
Because we're expecting other interfaces and transport to be
implemented, such as for example:
scmi_mailbox, scpi_smc, scpi_mailbox, ti_sci_smc etc.
>
> >
> > Or we could broaden the scope and call it "firmware_interface"?
> How would this be used? Will it be a list of interface that will be exposed
> to the guest?
>
The idea is to set mediator type for each Domain, so for example Xen can
use scmi_mailbox to communicate with SCP, Dom0 and DomD are also using
scmi_mailbox, but DomU using scmi_smc mediator because we have only 3
mailboxes in system. This is not implemented yet, right now, we are
introducing only scmi_smc support. In future, multiple mediator support
can be added to Xen.
Best regards,
Oleksii.
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