linux-kernel - Re: [PATCH v5 2/2] firmware: arm_scmi: Add qcom smc/hvc transport support

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Date:   Fri, 6 Oct 2023 16:17:32 -0400
From:   Brian Masney <bmasney@...hat.com>
To:     Nikunj Kela <quic_nkela@...cinc.com>
Cc:     sudeep.holla@....com, cristian.marussi@....com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        andersson@...nel.org, konrad.dybcio@...aro.org,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v5 2/2] firmware: arm_scmi: Add qcom smc/hvc transport
 support

On Fri, Oct 06, 2023 at 09:42:06AM -0700, Nikunj Kela wrote:
> This change adds the support for SCMI message exchange on Qualcomm
> virtual platforms.
> 
> The hypervisor associates an object-id also known as capability-id
> with each smc/hvc doorbell object. The capability-id is used to
> identify the doorbell from the VM's capability namespace, similar
> to a file-descriptor.
> 
> The hypervisor, in addition to the function-id, expects the capability-id
> to be passed in x1 register when SMC/HVC call is invoked.
> 
> The capability-id is allocated by the hypervisor on bootup and is stored in
> the shmem region by the firmware before starting Linux.
> 
> Signed-off-by: Nikunj Kela <quic_nkela@...cinc.com>

Reviewed-by: Brian Masney <bmasney@...hat.com>