linux-kernel - Re: [PATCH v4 2/3] scsi: ufs: core: Add UFS RTC support

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 for Android: free password hash cracker in your pocket

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

Message-ID: <20231208170609.GD15552@thinkpad>
Date:   Fri, 8 Dec 2023 22:36:09 +0530
From:   Manivannan Sadhasivam <mani@...nel.org>
To:     Bean Huo <beanhuo@...pp.de>
Cc:     avri.altman@....com, bvanassche@....org, alim.akhtar@...sung.com,
        jejb@...ux.ibm.com, martin.petersen@...cle.com,
        quic_cang@...cinc.com, quic_asutoshd@...cinc.com,
        beanhuo@...ron.com, thomas@...ch.de, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org, mikebi@...ron.com, lporzio@...ron.com
Subject: Re: [PATCH v4 2/3] scsi: ufs: core: Add UFS RTC support

On Fri, Dec 08, 2023 at 04:12:44PM +0100, Bean Huo wrote:
> On Fri, 2023-12-08 at 20:20 +0530, Manivannan Sadhasivam wrote:
> > > +        */
> > > +       val = ts64.tv_sec - hba->dev_info.rtc_time_baseline;
> > > +
> > 
> > This logic will work if the host has RTC. But if there is no RTC,
> > then tv_sec
> > will return time elapsed since boot. The spec clearly states that
> > host should
> > use absolute mode if it has RTC and relative otherwise.
> > 
> > Maybe you should add a logic to detect whether RTC is present or not
> > and
> > override the mode in device?
> 
> Thank you for your reviews. I will incorporate the suggested changes
> into the patch, addressing all comments except for the RTC mode switch.
> The proposal is to perform the RTC mode switch during UFS provisioning,
> not at runtime in the UFS online phase. This approach ensures that the
> UFS configuration is populated based on the RTC configuration
> established during provisioning. It is advisable not to change the RTC
> mode after provisioning is complete. Additionally, the usage of tv_sec,
> which returns time elapsed since boot, suggests that there is no issue
> with utilizing the RTC in this context.

Except that the warning will be issued to users after each 10s for 40 years.
Atleast get rid of that.

- Mani

> 
> Kind regards,
> Bean

-- 
மணிவண்ணன் சதாசிவம்