From: Sudeep Holla <sudeep.holla@arm.com>
To: Peng Fan <peng.fan@nxp.com>
Cc: Jassi Brar <jassisinghbrar@gmail.com>,
"robh+dt@kernel.org" <robh+dt@kernel.org>,
"mark.rutland@arm.com" <mark.rutland@arm.com>,
"andre.przywara@arm.com" <andre.przywara@arm.com>,
"f.fainelli@gmail.com" <f.fainelli@gmail.com>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
dl-linux-imx <linux-imx@nxp.com>,
Sudeep Holla <sudeep.holla@arm.com>
Subject: Re: [PATCH v5 1/2] dt-bindings: mailbox: add binding doc for the ARM SMC/HVC mailbox
Date: Fri, 30 Aug 2019 10:30:05 +0100 [thread overview]
Message-ID: <20190830093005.GA31297@bogus> (raw)
In-Reply-To: <AM0PR04MB448161C632722DF10989008088BD0@AM0PR04MB4481.eurprd04.prod.outlook.com>
On Fri, Aug 30, 2019 at 07:37:41AM +0000, Peng Fan wrote:
> Hi Jassi,
> > > I think there could be channel for TEE, and channel for Linux.
> > > For virtualization case, there could be dedicated channel for each VM.
> > >
> > I am talking from Linux pov. Functions 0xfe and 0xff above, can't both be
> > active at the same time, right?
>
> If I get your point correctly,
> On UP, both could not be active. On SMP, tx/rx could be both active, anyway
> this depends on secure firmware and Linux firmware design.
>
Just to confirm, we can't have SMC/HVC based Rx channel as there's no
*architectural* way to achieve it. So it can be based on some interrupt
from secure side and hence will be a *different* type of channel/controller.
Sorry to make this point repeatedly, but juts to be absolutely clear:
as it stands, SMC/HVC can be used only for Tx today.
--
Regards,
Sudeep
next prev parent reply other threads:[~2019-08-30 9:30 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-28 3:02 [PATCH v5 0/2] mailbox: arm: introduce smc triggered mailbox Peng Fan
2019-08-28 3:02 ` [PATCH v5 1/2] dt-bindings: mailbox: add binding doc for the ARM SMC/HVC mailbox Peng Fan
2019-08-28 13:58 ` Sudeep Holla
2019-08-30 2:47 ` Peng Fan
2019-08-30 5:58 ` Jassi Brar
2019-08-30 6:28 ` Peng Fan
2019-08-30 7:21 ` Jassi Brar
2019-08-30 7:37 ` Peng Fan
2019-08-30 7:52 ` Jassi Brar
2019-08-30 8:07 ` Peng Fan
2019-08-30 8:12 ` Jassi Brar
2019-08-30 8:28 ` Peng Fan
2019-09-09 13:32 ` Andre Przywara
2019-09-11 2:27 ` Peng Fan
2019-09-11 2:36 ` Jassi Brar
2019-09-11 11:42 ` Andre Przywara
2019-08-30 9:32 ` Sudeep Holla
2019-08-30 16:51 ` Jassi Brar
2019-08-30 9:30 ` Sudeep Holla [this message]
2019-08-30 9:40 ` Peng Fan
2019-09-02 13:39 ` Rob Herring
2019-09-02 14:20 ` Rob Herring
2019-09-09 15:42 ` Andre Przywara
2019-09-11 2:44 ` Jassi Brar
2019-09-11 15:03 ` Andre Przywara
2019-09-11 16:55 ` Jassi Brar
2019-09-12 3:05 ` Peng Fan
2019-08-28 3:03 ` [PATCH v5 2/2] mailbox: introduce ARM SMC based mailbox Peng Fan
2019-08-28 14:02 ` Sudeep Holla
2019-08-30 2:50 ` Peng Fan
2019-09-09 15:42 ` Andre Przywara
2019-09-11 5:58 ` Peng Fan
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