linux-kernel - Re: [PATCH v4 4/4] firmware: arm_scmi: Add qcom hvc/shmem transport support

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Date:   Mon, 2 Oct 2023 11:45:12 -0700
From:   Nikunj Kela <quic_nkela@...cinc.com>
To:     Brian Masney <bmasney@...hat.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 v4 4/4] firmware: arm_scmi: Add qcom hvc/shmem transport
 support


On 10/2/2023 11:39 AM, Brian Masney wrote:
> On Mon, Oct 02, 2023 at 02:34:06PM -0400, Brian Masney wrote:
>> On Mon, Sep 11, 2023 at 12:43:59PM -0700, Nikunj Kela wrote:
>>> +		func_id = readl((void __iomem *)(scmi_info->shmem) + size - 16);
>>> +#ifdef CONFIG_ARM64
>>> +		cap_id = readq((void __iomem *)(scmi_info->shmem) + size - 8);
>>> +#else
>>> +		/* capability-id is 32 bit wide on 32bit machines */
>>> +		cap_id = readl((void __iomem *)(scmi_info->shmem) + size - 8);
>>> +#endif
>> The 32 bit case is defined as a u64 in two places above.
> Also should the 32 bit case be 'size - 4' instead of 'size - 8'? Sorry
> I just noticed that as soon as I pressed send.
>
> Brian

I already addressed this in one of your previous comments. We are 
keeping last 16 bytes reserved for these two parameters regardless of 
the architecture.