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Date: Wed, 2 Mar 2022 09:20:34 +0100
From: Jean Rene Dawin <jdawin@...h.uni-bielefeld.de>
To: Ulf Hansson <ulf.hansson@...aro.org>
Cc: "H. Nikolaus Schaller" <hns@...delico.com>,
Huijin Park <huijin.park@...sung.com>,
linux-kernel <linux-kernel@...r.kernel.org>,
Discussions about the Letux Kernel
<letux-kernel@...nphoenux.org>,
Linux-OMAP <linux-omap@...r.kernel.org>,
linux-mmc@...r.kernel.org, Tony Lindgren <tony@...mide.com>
Subject: Re: [BUG] mmc: core: adjust polling interval for CMD1
Ulf Hansson wrote on Tue 1/03/22 14:38:
> On Thu, 17 Feb 2022 at 21:12, H. Nikolaus Schaller <hns@...delico.com> wrote:
> >
> > Hi,
> > Jean Rene Dawin did report to me a problem on the Beagle Bone Black starting
> > with our disto kernel based on v5.17-rc1:
> >
> > >> since kernel 5.17-rc1 I noticed slower emmc performance on Beaglebone
> > >> Black, but didn't check the logs.
> > >> When I tried to run 5.17.0-rc3-letux+ it booted fine, but during IO
> > >> traffic there were messages like
> > >>
> > >> [ 662.529584] mmc1: error -110 doing runtime resume
> > >> [ 669.293590] mmc1: Card stuck being busy! __mmc_poll_for_busy
> > >>
> > >> [ 739.076072] mmc1: Timeout waiting for hardware interrupt.
> > >> [ 739.145676] mmc1: sdhci: ============ SDHCI REGISTER DUMP ===========
> > >> [ 739.231053] mmc1: sdhci: Sys addr: 0x00000000 | Version: 0x00003101
> > >> [ 739.316472] mmc1: sdhci: Blk size: 0x00000200 | Blk cnt: 0x00000400
> > >> [ 739.401937] mmc1: sdhci: Argument: 0x00342d30 | Trn mode: 0x00000023
> > >> [ 739.487439] mmc1: sdhci: Present: 0x01f70000 | Host ctl: 0x00000000
> > >> [ 739.573007] mmc1: sdhci: Power: 0x0000000f | Blk gap: 0x00000000
> > >> [ 739.658609] mmc1: sdhci: Wake-up: 0x00000000 | Clock: 0x00003c07
> > >> [ 739.744224] mmc1: sdhci: Timeout: 0x00000007 | Int stat: 0x00000002
> > >> [ 739.829896] mmc1: sdhci: Int enab: 0x027f000b | Sig enab: 0x027f000b
> > >> [ 739.915623] mmc1: sdhci: ACmd stat: 0x00000000 | Slot int: 0x00000001
> > >> [ 740.001394] mmc1: sdhci: Caps: 0x07e10080 | Caps_1: 0x00000000
> > >> [ 740.087208] mmc1: sdhci: Cmd: 0x0000193a | Max curr: 0x00000000
> > >> [ 740.173051] mmc1: sdhci: Resp[0]: 0x00000900 | Resp[1]: 0x00000000
> > >> [ 740.258928] mmc1: sdhci: Resp[2]: 0x00000000 | Resp[3]: 0x00000000
> > >> [ 740.344854] mmc1: sdhci: Host ctl2: 0x00000000
> > >> [ 740.402796] mmc1: sdhci: ============================================
> > >>
> > >> and finally IO errors and a corrupted filesystem.
> > >>
> > >> 5.17.0-rc4-letux+ shows the same behaviour.
> >
> > I checked with my BeagleBoard Black (am3358) and can confirm this observation.
> > It happens only with the integrated eMMC but not with the µSD connected to
> > the other mmc interface.
> >
> > A git bisect found:
> >
> > 76bfc7ccc2fa9d382576f6013b57a0ef93d5a722 is the first bad commit
> > commit 76bfc7ccc2fa9d382576f6013b57a0ef93d5a722
> > Author: Huijin Park <huijin.park@...sung.com>
> > Date: Thu Nov 4 15:32:31 2021 +0900
> >
> > mmc: core: adjust polling interval for CMD1
> >
> > In mmc_send_op_cond(), loops are continuously performed at the same
> > interval of 10 ms. However the behaviour is not good for some eMMC
> > which can be out from a busy state earlier than 10 ms if normal.
> >
> > Rather than fixing about the interval time in mmc_send_op_cond(),
> > let's instead convert into using the common __mmc_poll_for_busy().
> >
> > The reason for adjusting the interval time is that it is important
> > to reduce the eMMC initialization time, especially in devices that
> > use eMMC as rootfs.
> >
> > Test log(eMMC:KLM8G1GETF-B041):
> >
> > before: 12 ms (0.311016 - 0.298729)
> > [ 0.295823] mmc0: starting CMD0 arg 00000000 flags 000000c0
> > [ 0.298729] mmc0: starting CMD1 arg 40000080 flags 000000e1<-start
> > [ 0.311016] mmc0: starting CMD1 arg 40000080 flags 000000e1<-finish
> > [ 0.311336] mmc0: starting CMD2 arg 00000000 flags 00000007
> >
> > after: 2 ms (0.301270 - 0.298762)
> > [ 0.295862] mmc0: starting CMD0 arg 00000000 flags 000000c0
> > [ 0.298762] mmc0: starting CMD1 arg 40000080 flags 000000e1<-start
> > [ 0.299067] mmc0: starting CMD1 arg 40000080 flags 000000e1
> > [ 0.299441] mmc0: starting CMD1 arg 40000080 flags 000000e1
> > [ 0.299879] mmc0: starting CMD1 arg 40000080 flags 000000e1
> > [ 0.300446] mmc0: starting CMD1 arg 40000080 flags 000000e1
> > [ 0.301270] mmc0: starting CMD1 arg 40000080 flags 000000e1<-finish
> > [ 0.301572] mmc0: starting CMD2 arg 00000000 flags 00000007
> >
> > Signed-off-by: Huijin Park <huijin.park@...sung.com>
> > Link: https://lore.kernel.org/r/20211104063231.2115-3-huijin.park@samsung.com
> > Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
> >
> > Reverting this makes v5.17-rc[1-4] work.
> >
> > Any suggestions or fixes?
> >
> > BR and thanks,
> > Nikolaus Schaller
> >
> > Reported-by: jdawin@...h.uni-bielefeld.de
> >
>
> Thanks for reporting and bisecting!
>
> What changed with the offending commit is two things:
>
> 1) We are sending the CMD1 more frequently, initially in the loop in
> the __mmc_poll_for_busy. Step by step, we increase the polling period.
> 2) We may end up using a slightly shorter total timeout for polling
> time, compared to what we used before the offending commit.
>
> Hopefully the problem is related to 2), in which case I think the
> below patch should help. Can you please give it a try?
>
> Kind regards
> Uffe
>
> From: Ulf Hansson <ulf.hansson@...aro.org>
> Date: Tue, 1 Mar 2022 14:24:21 +0100
> Subject: [PATCH] mmc: core: Extend timeout to 2s for MMC_SEND_OP_COND
>
> It looks like the timeout for the MMC_SEND_OP_COND (CMD1) might have become
> a bit too small due to recent changes. Therefore, let's extend it to 2s,
> which is probably more inline with its previous value, to fix the reported
> timeout problems.
>
> While at it, let's add a define for the timeout value, rather than using
> a hard-coded value for it.
>
> Reported-by: Jean Rene Dawin <jdawin@...h.uni-bielefeld.de>
> Reported-by: H. Nikolaus Schaller <hns@...delico.com>
> Cc: Huijin Park <huijin.park@...sung.com>
> Fixes: 76bfc7ccc2fa ("mmc: core: adjust polling interval for CMD1")
> Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
> ---
> drivers/mmc/core/mmc_ops.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c
> index d63d1c735335..1f57174b3cf3 100644
> --- a/drivers/mmc/core/mmc_ops.c
> +++ b/drivers/mmc/core/mmc_ops.c
> @@ -21,6 +21,7 @@
>
> #define MMC_BKOPS_TIMEOUT_MS (120 * 1000) /* 120s */
> #define MMC_SANITIZE_TIMEOUT_MS (240 * 1000) /* 240s */
> +#define MMC_OP_COND_TIMEOUT_MS 2000 /* 2s */
>
> static const u8 tuning_blk_pattern_4bit[] = {
> 0xff, 0x0f, 0xff, 0x00, 0xff, 0xcc, 0xc3, 0xcc,
> @@ -232,7 +233,8 @@ int mmc_send_op_cond(struct mmc_host *host, u32
> ocr, u32 *rocr)
> cmd.arg = mmc_host_is_spi(host) ? 0 : ocr;
> cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR;
>
> - err = __mmc_poll_for_busy(host, 1000, &__mmc_send_op_cond_cb, &cb_data);
> + err = __mmc_poll_for_busy(host, MMC_OP_COND_TIMEOUT_MS,
> + &__mmc_send_op_cond_cb, &cb_data);
> if (err)
> return err;
>
> --
> 2.25.1
Hi,
thanks. But testing with this patch still gives the same errors:
[ 52.259940] mmc1: Card stuck being busy! __mmc_poll_for_busy
[ 52.273380] mmc1: error -110 doing runtime resume
and the system gets stuck eventually.
Regards,
Jean Rene Dawin
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