linux-kernel - Re: [PATCH 0/2] Fix UFS task management command timeout

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Date:   Thu, 30 Sep 2021 16:50:38 +0800
From:   Po-Wen Kao <powen.kao@...iatek.com>
To:     Avri Altman <Avri.Altman@....com>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "axboe@...nel.dk" <axboe@...nel.dk>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stanley.chu@...iatek.com" <stanley.chu@...iatek.com>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
        "alim.akhtar@...sung.com" <alim.akhtar@...sung.com>,
        "jejb@...ux.ibm.com" <jejb@...ux.ibm.com>
CC:     "peter.wang@...iatek.com" <peter.wang@...iatek.com>,
        "chun-hung.wu@...iatek.com" <chun-hung.wu@...iatek.com>,
        "alice.chao@...iatek.com" <alice.chao@...iatek.com>,
        "jonathan.hsu@...iatek.com" <jonathan.hsu@...iatek.com>,
        "cc.chou@...iatek.com" <cc.chou@...iatek.com>,
        "chaotian.jing@...iatek.com" <chaotian.jing@...iatek.com>,
        "jiajie.hao@...iatek.com" <jiajie.hao@...iatek.com>,
        "wsd_upstream@...iatek.com" <wsd_upstream@...iatek.com>,
        "ed.tsai@...iatek.com" <ed.tsai@...iatek.com>
Subject: Re: [PATCH 0/2] Fix UFS task management command timeout

Hi Avri,

Thanks for reminding. It's exactly the same issue.

Best,
Po-Wen Kao

On Wed, 2021-09-29 at 07:39 +0000, Avri Altman wrote:
> > On UTP_TASK_REQ_COMPL interrupt, ufshcd_tmc_handler() iterates
> > through
> > busy requests in tags->rqs and complete request if corresponding
> > doorbell flag is reset.
> > However, ufshcd_issue_tm_cmd() allocates requests from tags-
> > >static_rqs
> > and trigger doorbell directly without dispatching request through
> > block
> > layer, thus requests can never be found in tags->rqs and completed
> > properly. Any TM command issued by ufshcd_issue_tm_cmd() inevitably
> > timeout and further leads to recovery flow failure when LU Reset or
> > Abort Task is issued.
> > 
> > In this patch, blk_mq_tagset_busy_iter() call in
> > ufshcd_tmc_handler()
> > is replaced with new interface, blk_mq_drv_tagset_busy_iter(), to
> > allow completion of request allocted by driver. The new interface
> > is
> > introduced for driver to iterate through requests in static_rqs.
> 
> Is this the same issue that was addressed here - 
> https://urldefense.com/v3/__https://www.spinics.net/lists/linux-scsi/msg164520.html__;!!CTRNKA9wMg0ARbw!yDkg-AVkMBFsnDBV42HMDgnE51HaEBarK2Tw8z8Di4aC1_7BrRkjIO13nz5rFUk-FA$
> A$  ?
> 
> Thanks,
> Avri
> 
> > 
> > Po-Wen Kao (2):
> >   blk-mq: new busy request iterator for driver
> >   scsi: ufs: fix TM request timeout
> > 
> >  block/blk-mq-tag.c        | 36 ++++++++++++++++++++++++++++++-----
> > -
> >  drivers/scsi/ufs/ufshcd.c |  2 +-
> >  include/linux/blk-mq.h    |  4 ++++
> >  3 files changed, 35 insertions(+), 7 deletions(-)
> > 
> > --
> > 2.18.0
> 
>