linux-kernel - RE: [RESEND PATCH v3] scsi: ufs: exclude UECxx from SFR dump list

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <000001d894c9$df3724a0$9da56de0$@samsung.com>
Date:   Mon, 11 Jul 2022 10:59:35 +0900
From:   "Kiwoong Kim" <kwmad.kim@...sung.com>
To:     "'Bart Van Assche'" <bvanassche@....org>,
        <linux-scsi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <alim.akhtar@...sung.com>, <avri.altman@....com>,
        <jejb@...ux.ibm.com>, <martin.petersen@...cle.com>,
        <beanhuo@...ron.com>, <cang@...eaurora.org>,
        <adrian.hunter@...el.com>, <sc.suh@...sung.com>,
        <hy50.seo@...sung.com>, <sh425.lee@...sung.com>,
        <bhoon95.kim@...sung.com>, <vkumar.1997@...sung.com>
Subject: RE: [RESEND PATCH v3] scsi: ufs: exclude UECxx from SFR dump list

> Is this behavior specific to the Exynos controller or is this behavior
> required by the UFSHCI specification? In the latter case, can you tell me
> where to find this requirement in the UFSHCI specification? I haven't
> found that requirement yet. Maybe this means that I overlooked something?
> 
> Thanks,
> 
> Bart. 

This is needed because those SFRs are ROC (Read to Clear) type.
That means reading causes clearing contexts.
The SFRs are mainly read in interrupt context but the reading is also done in dump.

Besides, I think reading them in dump is not proper because reading them is not just 'reading'

Thanks.
Kiwoong Kim