linux-kernel - Re: [PATCH V2 3/6] mmc: block: Be sure to wait while busy in CQE error recovery

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Message-ID: <8bc2daa3-55ad-44ea-9205-40fb09852561@intel.com>
Date:   Mon, 6 Nov 2023 08:35:24 +0200
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Avri Altman <Avri.Altman@....com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Kornel Dulęba <korneld@...omium.org>,
        Radoslaw Biernacki <biernacki@...gle.com>,
        Gwendal Grignou <gwendal@...omium.org>,
        Asutosh Das <quic_asutoshd@...cinc.com>
Cc:     Chaotian Jing <chaotian.jing@...iatek.com>,
        Bhavya Kapoor <b-kapoor@...com>,
        Kamal Dasu <kamal.dasu@...adcom.com>,
        Al Cooper <alcooperx@...il.com>,
        Haibo Chen <haibo.chen@....com>,
        Shaik Sajida Bhanu <quic_c_sbhanu@...cinc.com>,
        Sai Krishna Potthuri <sai.krishna.potthuri@....com>,
        Victor Shih <victor.shih@...esyslogic.com.tw>,
        Ben Chuang <ben.chuang@...esyslogic.com.tw>,
        Thierry Reding <thierry.reding@...il.com>,
        Aniruddha Tvs Rao <anrao@...dia.com>,
        Chun-Hung Wu <chun-hung.wu@...iatek.com>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V2 3/6] mmc: block: Be sure to wait while busy in CQE
 error recovery

On 3/11/23 12:48, Avri Altman wrote:
>> STOP command does not guarantee to wait while busy, but subsequent
>> command MMC_CMDQ_TASK_MGMT to discard the queue will fail if the
>> card is busy, so be sure to wait by employing mmc_poll_for_busy().
> Doesn't the Task Discard Sequence expects you to check CQDPT[i]==1
> before sending MMC_CMDQ_TASK_MGMT to discard task id i?

We do not clear individual tasks.  Instead the MMC_CMDQ_TASK_MGMT is
sent with the op-code to "discard entire queue", which will also
work even if the queue is empty. Refer JESD84-B51A,
6.6.39.6 CMDQ_TASK_MGMT and Table 43 — Task Management op-codes.

> 
> Thanks,
> Avri
> 
>>
>> Fixes: 72a5af554df8 ("mmc: core: Add support for handling CQE requests")
>> Cc: stable@...r.kernel.org
>> Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
>> ---
>>  drivers/mmc/core/core.c | 2 ++
>>  1 file changed, 2 insertions(+)
>>
>> diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c index
>> 3d3e0ca52614..befde2bd26d3 100644
>> --- a/drivers/mmc/core/core.c
>> +++ b/drivers/mmc/core/core.c
>> @@ -553,6 +553,8 @@ int mmc_cqe_recovery(struct mmc_host *host)
>>         cmd.busy_timeout = MMC_CQE_RECOVERY_TIMEOUT;
>>         mmc_wait_for_cmd(host, &cmd, 0);
>>
>> +       mmc_poll_for_busy(host->card, MMC_CQE_RECOVERY_TIMEOUT,
>> true,
>> + MMC_BUSY_IO);
>> +
>>         memset(&cmd, 0, sizeof(cmd));
>>         cmd.opcode       = MMC_CMDQ_TASK_MGMT;
>>         cmd.arg          = 1; /* Discard entire queue */
>> --
>> 2.34.1
>