linux-kernel - Re: [PATCH v6 4/8] scsi: hisi_sas: Modify v3 HW SATA disk error state completion processing

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Message-ID: <6319a91e-43c8-e4c9-915b-29bfe1532c02@huawei.com>
Date:   Mon, 17 Oct 2022 12:01:00 +0100
From:   John Garry <john.garry@...wei.com>
To:     Niklas Cassel <Niklas.Cassel@....com>
CC:     "jejb@...ux.ibm.com" <jejb@...ux.ibm.com>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
        "jinpu.wang@...ud.ionos.com" <jinpu.wang@...ud.ionos.com>,
        "damien.lemoal@...nsource.wdc.com" <damien.lemoal@...nsource.wdc.com>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linuxarm@...wei.com" <linuxarm@...wei.com>,
        "yangxingui@...wei.com" <yangxingui@...wei.com>
Subject: Re: [PATCH v6 4/8] scsi: hisi_sas: Modify v3 HW SATA disk error state
 completion processing

On 17/10/2022 11:45, Niklas Cassel wrote:
> On Mon, Oct 17, 2022 at 05:20:31PM +0800, John Garry wrote:
>> From: Xingui Yang<yangxingui@...wei.com>
>>
>> When an NCQ error occurs, the  controller will abnormally complete the I/Os
>> that are newly delivered to disk, and bit8 in CQ dw3 will be set which
>> indicates that the SATA disk is in error state. The current processing flow
>> is to set ts->stat to SAS_OPEN_REJECT and then sas_ata_task_done() will
>> set FIS stat to ATA_ERR. After analyzing the IO by ata_eh_analyze_tf(),
>> err_mask will set to AC_ERR_HSM. If media error occurs for four times
>> within 10 minutes and the chip rejects new I/Os for four times, NCQ will
>> be disabled due to excessive errors, which is undesirable.
> With patch 8/8 in this series, will it still set err_mask to AC_ERR_HSM?
> If not, is this patch still needed with patch 8/8?
> 

I spoke to colleague Xingui Yang and he does not think that it is still 
required. But I was leaving it in as it still looked like a sensible 
change. I suppose I can drop it.

Thanks,
John