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

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Date:   Mon, 17 Oct 2022 10:45:48 +0000
From:   Niklas Cassel <Niklas.Cassel@....com>
To:     John Garry <john.garry@...wei.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 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?


Kind regards,
Niklas

> 
> Therefore, use sas_task_abort() to handle abnormally completed I/Os when
> SATA disk is in error state, as these abnormally completed I/Os are already
> processed by sas_ata_device_link_abort() and qc->flag are set to
> ATA_QCFLAG_FAILED. If sas_task_abort() is used, qc->err_mask will not be
> modified in EH. Unlike the current process flow, it will not increase
> the count of ECAT_TOUT_HSM and not turn off NCQ. Like other I/Os on the
> disk that do not have an error but do not return after the NCQ error, they
> are retried after the EH.
> 
> Signed-off-by: Xingui Yang <yangxingui@...wei.com>
> Signed-off-by: John Garry <john.garry@...wei.com>
> ---
>  drivers/scsi/hisi_sas/hisi_sas_v3_hw.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
> index 0ae8a60aaf93..0c3fcb807806 100644
> --- a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
> +++ b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
> @@ -428,6 +428,8 @@
>  #define CMPLT_HDR_DEV_ID_OFF		16
>  #define CMPLT_HDR_DEV_ID_MSK		(0xffff << CMPLT_HDR_DEV_ID_OFF)
>  /* dw3 */
> +#define SATA_DISK_IN_ERROR_STATUS_OFF	8
> +#define SATA_DISK_IN_ERROR_STATUS_MSK	(0x1 << SATA_DISK_IN_ERROR_STATUS_OFF)
>  #define CMPLT_HDR_SATA_DISK_ERR_OFF	16
>  #define CMPLT_HDR_SATA_DISK_ERR_MSK	(0x1 << CMPLT_HDR_SATA_DISK_ERR_OFF)
>  #define CMPLT_HDR_IO_IN_TARGET_OFF	17
> @@ -2219,7 +2221,8 @@ slot_err_v3_hw(struct hisi_hba *hisi_hba, struct sas_task *task,
>  		} else if (dma_rx_err_type & RX_DATA_LEN_UNDERFLOW_MSK) {
>  			ts->residual = trans_tx_fail_type;
>  			ts->stat = SAS_DATA_UNDERRUN;
> -		} else if (dw3 & CMPLT_HDR_IO_IN_TARGET_MSK) {
> +		} else if ((dw3 & CMPLT_HDR_IO_IN_TARGET_MSK) ||
> +			   (dw3 & SATA_DISK_IN_ERROR_STATUS_MSK)) {
>  			ts->stat = SAS_PHY_DOWN;
>  			slot->abort = 1;
>  		} else {
> -- 
> 2.35.3
>