linux-kernel - Re: [PATCH v2 1/2] firmware: qcom: scm: Return -EOPNOTSUPP for unsupported SHM bridge enabling

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Message-ID: <39b71082-731b-4a49-a999-0684f30dd79b@quicinc.com>
Date: Tue, 22 Oct 2024 23:45:21 +0530
From: Kuldeep Singh <quic_kuldsing@...cinc.com>
To: Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio
	<konradybcio@...nel.org>,
        Bartosz Golaszewski
	<bartosz.golaszewski@...aro.org>
CC: <linux-arm-msm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        "Qingqing
 Zhou" <quic_qqzhou@...cinc.com>
Subject: Re: [PATCH v2 1/2] firmware: qcom: scm: Return -EOPNOTSUPP for
 unsupported SHM bridge enabling



On 10/14/2024 4:45 PM, Kuldeep Singh wrote:
> From: Qingqing Zhou <quic_qqzhou@...cinc.com>
> 
> When enabling SHM bridge, QTEE returns 0 and sets error 4 in result to
> qcom_scm for unsupported platforms. Currently, tzmem interprets this as
> an unknown error rather than recognizing it as an unsupported platform.
> 
> Error log:
> [    0.177224] qcom_scm firmware:scm: error (____ptrval____): Failed to enable the TrustZone memory allocator
> [    0.177244] qcom_scm firmware:scm: probe with driver qcom_scm failed with error 4
> 
> To address this, modify the function call qcom_scm_shm_bridge_enable()
> to remap result to indicate an unsupported error. This way, tzmem will
> correctly identify it as an unsupported platform case instead of
> reporting it as an error.
> 
> Fixes: 178e19c0df1b ("firmware: qcom: scm: add support for SHM bridge operations")
> Signed-off-by: Qingqing Zhou <quic_qqzhou@...cinc.com>
> Co-developed-by: Kuldeep Singh <quic_kuldsing@...cinc.com>
> Signed-off-by: Kuldeep Singh <quic_kuldsing@...cinc.com>

Hi Bjorn,

Can you please apply this fix I'll split this one and send separately.
This fixes qcom_scm probe failure and is needed for other patches to
build upon. Thank you.

-- 
Regards
Kuldeep