[v2] xen/arm: Add support for S32CC platforms and LINFlexD UART

[PATCH v2 7/8] SUPPORT.md: Describe SCMI-SMC layer feature

Posted by Andrei Cherechesu (OSS) 1 month, 3 weeks ago

From: Andrei Cherechesu <andrei.cherechesu@nxp.com>

Describe the layer which enables SCMI over SMC calls forwarding
to EL3 FW if issued by Dom0. If the SCMI firmware node is not
found in Dom0's DT during initialization, it fails silently
as it's not mandatory.

The SCMI SMCs trapping at EL2 now lets Dom0 perform SCMI ops for
interacting with system-level resources almost as if it would be
running natively.

Signed-off-by: Andrei Cherechesu <andrei.cherechesu@nxp.com>
---
 SUPPORT.md | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/SUPPORT.md b/SUPPORT.md
index 23dd7e6424..d8ffddfc44 100644
--- a/SUPPORT.md
+++ b/SUPPORT.md
@@ -927,6 +927,14 @@ Add/Remove device tree nodes using a device tree overlay binary (.dtbo).
 
     Status: Tech Preview
 
+### Arm: SCMI over SMC calls forwarding to EL3 Firmware
+
+Enable SCMI calls using SMC as doorbell mechanism and Shared Memory for
+transport ("arm,scmi-smc" compatible only) to reach EL3 Firmware if issued
+by Dom0. Some platforms use SCMI for access to system-level resources.
+
+    Status: Supported
+
 ## Virtual Hardware, QEMU
 
 This section describes supported devices available in HVM mode using a
-- 
2.45.2

Re: [PATCH v2 7/8] SUPPORT.md: Describe SCMI-SMC layer feature

Posted by Julien Grall 1 month, 3 weeks ago

Hi,

On 30/09/2024 12:47, Andrei Cherechesu (OSS) wrote:
> From: Andrei Cherechesu <andrei.cherechesu@nxp.com>
> 
> Describe the layer which enables SCMI over SMC calls forwarding
> to EL3 FW if issued by Dom0. 

s/Dom0/Hardware domain/ and everywhere else below.

> If the SCMI firmware node is not
> found in Dom0's DT during initialization, it fails silently
> as it's not mandatory.

You are looking for the node in the host's DT.

> 
> The SCMI SMCs trapping at EL2 now lets Dom0 perform SCMI ops for
> interacting with system-level resources almost as if it would be
> running natively.
> 
> Signed-off-by: Andrei Cherechesu <andrei.cherechesu@nxp.com>
> ---
>   SUPPORT.md | 8 ++++++++
>   1 file changed, 8 insertions(+)
> 
> diff --git a/SUPPORT.md b/SUPPORT.md
> index 23dd7e6424..d8ffddfc44 100644
> --- a/SUPPORT.md
> +++ b/SUPPORT.md
> @@ -927,6 +927,14 @@ Add/Remove device tree nodes using a device tree overlay binary (.dtbo).
>   
>       Status: Tech Preview
>   
> +### Arm: SCMI over SMC calls forwarding to EL3 Firmware
> +
> +Enable SCMI calls using SMC as doorbell mechanism and Shared Memory for
> +transport ("arm,scmi-smc" compatible only) to reach EL3 Firmware if issued
> +by Dom0. Some platforms use SCMI for access to system-level resources.
> +
> +    Status: Supported

Bertrand, can you confirm this should be ok to support it (includingn 
security support)?

Cheers,

-- 
Julien Grall