linux-kernel - Re: [PATCH 1/4] soc: qcom: aoss: Move length requirements from caller

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Message-ID: <20230731231014.GI1428172@hu-bjorande-lv.qualcomm.com>
Date:   Mon, 31 Jul 2023 16:10:14 -0700
From:   Bjorn Andersson <quic_bjorande@...cinc.com>
To:     Chris Lew <quic_clew@...cinc.com>
CC:     Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Alex Elder <elder@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-msm@...r.kernel.org>, <linux-remoteproc@...r.kernel.org>
Subject: Re: [PATCH 1/4] soc: qcom: aoss: Move length requirements from caller

On Mon, Jul 31, 2023 at 02:29:44PM -0700, Chris Lew wrote:
> 
> 
> On 7/30/2023 9:10 PM, Bjorn Andersson wrote:
> > diff --git a/drivers/soc/qcom/qcom_aoss.c b/drivers/soc/qcom/qcom_aoss.c
> >   	/* The message RAM only implements 32-bit accesses */
> >   	__iowrite32_copy(qmp->msgram + qmp->offset + sizeof(u32),
> > -			 data, len / sizeof(u32));
> > -	writel(len, qmp->msgram + qmp->offset);
> > +			 buf, sizeof(buf) / sizeof(u32));
> > +	writel(sizeof(buf), qmp->msgram + qmp->offset);
> 
> Looks like we are telling the firmware the packet size will always be
> QMP_MSG_LEN?
> 
> This should be ok but might be a problem when debugging. The AOSS firmware
> only logs size of the message instead of the full string because of memory
> constraints.
> 

Until now ipa_power_retention() has been passing 36 here, everyone else
64, so it is ok.

> We would normally match the firmware and host logs based on size, but won't
> be able to differentiate this way with a fixed size.

I don't mind us changing it to ALIGN(len, 4), but as that would change
the current behavior I'd like to do so in a subsequent patch.

Speaking of behavior, is 64 the max message size? We inherited the 64
from the initial downstream implementation, but qmp->size is quite a bit
bigger.

Regards,
Bjorn