linux-kernel - Re: LKFT: arm x15: mmc1: cache flush error -110

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Date:   Tue, 25 Feb 2020 12:35:56 +0100
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Jon Hunter <jonathanh@...dia.com>
Cc:     Bitan Biswas <bbiswas@...dia.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Naresh Kamboju <naresh.kamboju@...aro.org>,
        Jens Axboe <axboe@...nel.dk>,
        Alexei Starovoitov <ast@...nel.org>,
        linux-block <linux-block@...r.kernel.org>,
        lkft-triage@...ts.linaro.org,
        open list <linux-kernel@...r.kernel.org>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        Arnd Bergmann <arnd@...db.de>,
        John Stultz <john.stultz@...aro.org>,
        Thierry Reding <treding@...dia.com>
Subject: Re: LKFT: arm x15: mmc1: cache flush error -110

On Tue, 25 Feb 2020 at 11:04, Jon Hunter <jonathanh@...dia.com> wrote:
>
>
> On 24/02/2020 11:16, Ulf Hansson wrote:
> > + Adrian
> >
> > On Fri, 21 Feb 2020 at 20:44, Bitan Biswas <bbiswas@...dia.com> wrote:
> >>
> >> On 2/21/20 1:48 AM, Ulf Hansson wrote:
> >>> External email: Use caution opening links or attachments
> >>>
> >>>
> >>> On Thu, 20 Feb 2020 at 18:54, Naresh Kamboju <naresh.kamboju@...aro.org> wrote:
> >>>>
> >>>> On Wed, 19 Feb 2020 at 21:54, Ulf Hansson <ulf.hansson@...aro.org> wrote:
> >>>>>
> >>>>> On Thu, 13 Feb 2020 at 16:43, Naresh Kamboju <naresh.kamboju@...aro.org> wrote:
> >>>>>>
> >>>>>
> >>>>> Try to restore the value for the cache flush timeout, by updating the
> >>>>> define MMC_CACHE_FLUSH_TIMEOUT_MS to 10 * 60 * 1000".
> >>>>
> >>>> I have increased the timeout to 10 minutes but it did not help.
> >>>> Same error found.
> >>>> [  608.679353] mmc1: Card stuck being busy! mmc_poll_for_busy
> >>>> [  608.684964] mmc1: cache flush error -110
> >>>> [  608.689005] blk_update_request: I/O error, dev mmcblk1, sector
> >>>> 4302400 op 0x1:(WRITE) flags 0x20800 phys_seg 1 prio class 0
> >>>>
> >>>> OTOH, What best i could do for my own experiment to revert all three patches and
> >>>> now the reported error gone and device mount successfully [1].
> >>>>
> >>>> List of patches reverted,
> >>>>    mmc: core: Specify timeouts for BKOPS and CACHE_FLUSH for eMMC
> >>>>    mmc: block: Use generic_cmd6_time when modifying
> >>>>      INAND_CMD38_ARG_EXT_CSD
> >>>>    mmc: core: Default to generic_cmd6_time as timeout in __mmc_switch()
>
>
> Reverting all the above also fixes the problem for me.
>
> >>   I find that from the commit the changes in mmc_flush_cache below is
> >> the cause.
> >>
> >> ##
> >> @@ -961,7 +963,8 @@ int mmc_flush_cache(struct mmc_card *card)
> >>                          (card->ext_csd.cache_size > 0) &&
> >>                          (card->ext_csd.cache_ctrl & 1)) {
> >>                  err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
> >> -                               EXT_CSD_FLUSH_CACHE, 1, 0);
> >> +                                EXT_CSD_FLUSH_CACHE, 1,
> >> +                                MMC_CACHE_FLUSH_TIMEOUT_MS);
>
>
> I no longer see the issue on reverting the above hunk as Bitan suggested
> but now I see the following (which is expected) ...
>
>  WARNING KERN mmc1: unspecified timeout for CMD6 - use generic
>
> > Just as a quick sanity test, please try the below patch, which
> > restores the old cache flush timeout to 10min.
> >
> > However, as I indicated above, this seems to be a problem that needs
> > to be fixed at in the host driver side. For the sdhci driver, there is
> > a bit of a tricky logic around how to deal with timeouts in
> > sdhci_send_command(). My best guess is that's where we should look
> > more closely (and I am doing that).
> >
> > From: Ulf Hansson <ulf.hansson@...aro.org>
> > Date: Mon, 24 Feb 2020 11:43:33 +0100
> > Subject: [PATCH] mmc: core: Restore busy timeout for eMMC cache flushing
> >
> > Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
> > ---
> >  drivers/mmc/core/mmc_ops.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c
> > index da425ee2d9bf..713e7dd6d028 100644
> > --- a/drivers/mmc/core/mmc_ops.c
> > +++ b/drivers/mmc/core/mmc_ops.c
> > @@ -21,7 +21,7 @@
> >
> >  #define MMC_OPS_TIMEOUT_MS             (10 * 60 * 1000) /* 10min*/
> >  #define MMC_BKOPS_TIMEOUT_MS           (120 * 1000) /* 120s */
> > -#define MMC_CACHE_FLUSH_TIMEOUT_MS     (30 * 1000) /* 30s */
> > +#define MMC_CACHE_FLUSH_TIMEOUT_MS     (10 * 60 * 1000) /* 10min */
>
> This does not fix the problem for me.

Thanks for testing and the report - the results are not surprising.

I am getting back with an update asap, just want to complete my tests
over here before I say more.

Kind regards
Uffe