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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 I/O 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. 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@huawei.com> Signed-off-by: John Garry <john.garry@huawei.com> Link: https://lore.kernel.org/r/1665998435-199946-5-git-send-email-john.garry@huawei.com Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.