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

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Message-ID: <fa9cf828-ae82-8145-c60a-4b15c340de86@quicinc.com>
Date:   Mon, 9 Oct 2023 12:16:10 -0700
From:   Nikunj Kela <quic_nkela@...cinc.com>
To:     Sudeep Holla <sudeep.holla@....com>
CC:     <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 10/9/2023 12:08 PM, Sudeep Holla wrote:
> On Mon, Oct 09, 2023 at 10:49:44AM -0700, Nikunj Kela wrote:
>> On 10/9/2023 8:29 AM, Sudeep Holla wrote:
>>> On Mon, Oct 09, 2023 at 07:59:08AM -0700, Nikunj Kela wrote:
>>>> On 10/9/2023 7:47 AM, Sudeep Holla wrote:
>>>>> 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.
>>>>>>
>>>>> Since you are happy to move to signed value, I assume you are happy to loose
>>>>> upper half of the range values ?
>>>>>
>>>>> Anyways after Bjorn pointed out inconsistency, I am thinking of moving
>>>>> all the values to unsigned long to work with both 32bit and 64bit.
>>>>>
>>>>> Does the below delta on top of this patch works for you and makes sense?
>>>> This looks good to me. Will do some testing and float v6 with the changes
>>>> you suggested below. Thanks
>>>>
>>> Please refer or use the patch from [1] when reposting. I rebased on my
>>> patch[2] that I posted few minutes back. I am trying to finalise the branch
>>> and send PR in next couple of days, so please test and post sooner. Sorry
>>> for the rush.
>> Validated the patch from [1] below on Qualcomm ARM64 virtual platform using
>> SMC64 convention. Thanks!
>>
> Thanks, since I have patched a bit, it is better if you post them so that
> we have a link for the exact patch on the list. Just pick up the patches
> from the branch[1] and post them as v6 with a change log so that all the
> details are captured for reference purposes.

v6 on its way, thanks!


>