| Message ID | 20230407035618.25123-1-yangxingui@huawei.com (mailing list archive) |
|---|---|
| State | Deferred |
| Headers | show |
| Series | scsi: libsas: set tf to normal in sas_ata_device_link_abort() | expand |
On 2023/4/7 11:56, Xingui Yang wrote: > If the disk returns UNC for more than five times within a short period, the > number of retry times for other I/Os may reach scmd->allowed, and the > default error "Illegal Request" is returned for other I/Os, as follows: > > [ 273.801770] hisi_sas_v3_hw 0000:b4:02.0: erroneous completion disk err dev id=2 sas_addr=0x5000000000000605 CQ hdr: 0x400903 0x20103 0x0 0x80470000 > [ 273.875286] sas: Enter sas_scsi_recover_host busy: 30 failed: 30 > [ 273.879895] sas: trying to find task 0x00000000d9cfc893 > [ 273.879896] sas: sas_scsi_find_task: aborting task 0x00000000d9cfc893 > [ 273.880054] sas: sas_scsi_find_task: task 0x00000000d9cfc893 is done > [ 273.880055] sas: sas_eh_handle_sas_errors: task 0x00000000d9cfc893 is done > [ 273.880236] ata6.00: failed command: READ FPDMA QUEUED > [ 273.880238] ata6.00: cmd 60/08:00:59:27:00/00:00:00:00:00/40 tag 22 ncq dma 4096 in > res 41/04:00:20:00:00/00:00:00:00:00/00 Emask 0x1 (device error) > [ 273.880239] ata6.00: status: { DRDY ERR } > [ 273.880240] ata6.00: error: { ABRT } > [ 273.880241] ata6.00: failed command: READ FPDMA QUEUED > [ 273.880243] ata6.00: cmd 60/90:00:d1:26:00/00:00:00:00:00/40 tag 23 ncq dma 73728 in > res 41/40:90:10:27:00/00:00:00:00:00/00 Emask 0x409 (media error) <F> > [ 273.880245] ata6.00: status: { DRDY ERR } > [ 273.880246] ata6.00: error: { UNC } > [ 273.880247] ata6.00: failed command: READ FPDMA QUEUED > [ 273.880249] ata6.00: cmd 60/08:00:19:27:00/00:00:00:00:00/40 tag 24 ncq dma 4096 in > res 41/04:00:20:00:00/00:00:00:00:00/00 Emask 0x1 (device error) > [ 273.880250] ata6.00: status: { DRDY ERR } > [ 273.880251] ata6.00: error: { ABRT } > [ 274.199477] scmd->retries: 3, scmd->allowed: 5 > [ 274.199478] scmd->retries: 3, scmd->allowed: 5 > [ 274.199479] scmd->retries: 3, scmd->allowed: 5 > [ 274.199481] scmd->retries: 3, scmd->allowed: 5 > [ 274.199482] scmd->retries: 3, scmd->allowed: 5 > [ 274.199483] scmd->retries: 2, scmd->allowed: 5 > [ 274.199484] scmd->retries: 3, scmd->allowed: 5 > [ 274.199485] scmd->retries: 3, scmd->allowed: 5 > [ 274.199486] scmd->retries: 5, scmd->allowed: 5 > [ 274.199487] scmd->retries: 2, scmd->allowed: 5 > [ 274.199488] scmd->retries: 2, scmd->allowed: 5 > [ 274.199524] sd 6:0:1:0: [sdb] tag#258 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE > [ 274.199527] sd 6:0:1:0: [sdb] tag#258 Sense Key : Illegal Request [current] > [ 274.199530] sd 6:0:1:0: [sdb] tag#258 Add. Sense: Unaligned write command > [ 274.199532] sd 6:0:1:0: [sdb] tag#258 CDB: Read(10) 28 00 00 00 27 59 00 00 08 00 > [ 274.199535] print_req_error: I/O error, dev sdb, sector 10073 > [ 274.199573] sd 6:0:1:0: [sdb] tag#259 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE > [ 274.199574] sd 6:0:1:0: [sdb] tag#259 Sense Key : Medium Error [current] > [ 274.199576] sd 6:0:1:0: [sdb] tag#259 Add. Sense: Unrecovered read error - auto reallocate failed > [ 274.199578] sd 6:0:1:0: [sdb] tag#259 CDB: Read(10) 28 00 00 00 26 d1 00 00 90 00 > [ 274.199579] print_req_error: I/O error, dev sdb, sector 10000 > [ 274.199608] ata6: EH complete > [ 274.199615] sas: --- Exit sas_scsi_recover_host: busy: 0 failed: 30 tries: 1 > > As mentioned in ata_eh_qc_retry(), if qc->err_mask is zero then increment > scmd->allowed. So set tf to normal may be better. Hi Xingui, If we increase scmd->allowed every time, and the device returns UNC for too many times, will the other IO pending for too long and cause hungtask? And also the runtime check in scsi_cmd_runtime_exceeced() will not trigger since cmd->allowed is extended. Thanks, Jason > > Signed-off-by: Xingui Yang <yangxingui@huawei.com> > --- > drivers/scsi/libsas/sas_ata.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/drivers/scsi/libsas/sas_ata.c b/drivers/scsi/libsas/sas_ata.c > index 77714a495cbb..f5047e8dcb59 100644 > --- a/drivers/scsi/libsas/sas_ata.c > +++ b/drivers/scsi/libsas/sas_ata.c > @@ -949,8 +949,8 @@ void sas_ata_device_link_abort(struct domain_device *device, bool force_reset) > unsigned long flags; > > spin_lock_irqsave(ap->lock, flags); > - device->sata_dev.fis[2] = ATA_ERR | ATA_DRDY; /* tf status */ > - device->sata_dev.fis[3] = ATA_ABORTED; /* tf error */ > + device->sata_dev.fis[2] = ATA_DRDY; /* tf status */ > + device->sata_dev.fis[3] = 0; /* tf error */ > > link->eh_info.err_mask |= AC_ERR_DEV; > if (force_reset) >
Hi Jason On 2023/4/14 15:36, Jason Yan wrote: > On 2023/4/7 11:56, Xingui Yang wrote: >> If the disk returns UNC for more than five times within a short >> period, the >> number of retry times for other I/Os may reach scmd->allowed, and the >> default error "Illegal Request" is returned for other I/Os, as follows: >> >> [ 273.801770] hisi_sas_v3_hw 0000:b4:02.0: erroneous completion disk >> err dev id=2 sas_addr=0x5000000000000605 CQ hdr: 0x400903 0x20103 0x0 >> 0x80470000 >> [ 273.875286] sas: Enter sas_scsi_recover_host busy: 30 failed: 30 >> [ 273.879895] sas: trying to find task 0x00000000d9cfc893 >> [ 273.879896] sas: sas_scsi_find_task: aborting task 0x00000000d9cfc893 >> [ 273.880054] sas: sas_scsi_find_task: task 0x00000000d9cfc893 is done >> [ 273.880055] sas: sas_eh_handle_sas_errors: task 0x00000000d9cfc893 >> is done >> [ 273.880236] ata6.00: failed command: READ FPDMA QUEUED >> [ 273.880238] ata6.00: cmd 60/08:00:59:27:00/00:00:00:00:00/40 tag 22 >> ncq dma 4096 in >> res 41/04:00:20:00:00/00:00:00:00:00/00 Emask >> 0x1 (device error) >> [ 273.880239] ata6.00: status: { DRDY ERR } >> [ 273.880240] ata6.00: error: { ABRT } >> [ 273.880241] ata6.00: failed command: READ FPDMA QUEUED >> [ 273.880243] ata6.00: cmd 60/90:00:d1:26:00/00:00:00:00:00/40 tag 23 >> ncq dma 73728 in >> res 41/40:90:10:27:00/00:00:00:00:00/00 Emask >> 0x409 (media error) <F> >> [ 273.880245] ata6.00: status: { DRDY ERR } >> [ 273.880246] ata6.00: error: { UNC } >> [ 273.880247] ata6.00: failed command: READ FPDMA QUEUED >> [ 273.880249] ata6.00: cmd 60/08:00:19:27:00/00:00:00:00:00/40 tag 24 >> ncq dma 4096 in >> res 41/04:00:20:00:00/00:00:00:00:00/00 Emask >> 0x1 (device error) >> [ 273.880250] ata6.00: status: { DRDY ERR } >> [ 273.880251] ata6.00: error: { ABRT } >> [ 274.199477] scmd->retries: 3, scmd->allowed: 5 >> [ 274.199478] scmd->retries: 3, scmd->allowed: 5 >> [ 274.199479] scmd->retries: 3, scmd->allowed: 5 >> [ 274.199481] scmd->retries: 3, scmd->allowed: 5 >> [ 274.199482] scmd->retries: 3, scmd->allowed: 5 >> [ 274.199483] scmd->retries: 2, scmd->allowed: 5 >> [ 274.199484] scmd->retries: 3, scmd->allowed: 5 >> [ 274.199485] scmd->retries: 3, scmd->allowed: 5 >> [ 274.199486] scmd->retries: 5, scmd->allowed: 5 >> [ 274.199487] scmd->retries: 2, scmd->allowed: 5 >> [ 274.199488] scmd->retries: 2, scmd->allowed: 5 >> [ 274.199524] sd 6:0:1:0: [sdb] tag#258 FAILED Result: >> hostbyte=DID_OK driverbyte=DRIVER_SENSE >> [ 274.199527] sd 6:0:1:0: [sdb] tag#258 Sense Key : Illegal Request >> [current] >> [ 274.199530] sd 6:0:1:0: [sdb] tag#258 Add. Sense: Unaligned write >> command >> [ 274.199532] sd 6:0:1:0: [sdb] tag#258 CDB: Read(10) 28 00 00 00 27 >> 59 00 00 08 00 >> [ 274.199535] print_req_error: I/O error, dev sdb, sector 10073 >> [ 274.199573] sd 6:0:1:0: [sdb] tag#259 FAILED Result: >> hostbyte=DID_OK driverbyte=DRIVER_SENSE >> [ 274.199574] sd 6:0:1:0: [sdb] tag#259 Sense Key : Medium Error >> [current] >> [ 274.199576] sd 6:0:1:0: [sdb] tag#259 Add. Sense: Unrecovered read >> error - auto reallocate failed >> [ 274.199578] sd 6:0:1:0: [sdb] tag#259 CDB: Read(10) 28 00 00 00 26 >> d1 00 00 90 00 >> [ 274.199579] print_req_error: I/O error, dev sdb, sector 10000 >> [ 274.199608] ata6: EH complete >> [ 274.199615] sas: --- Exit sas_scsi_recover_host: busy: 0 failed: 30 >> tries: 1 >> >> As mentioned in ata_eh_qc_retry(), if qc->err_mask is zero then increment >> scmd->allowed. So set tf to normal may be better. > > Hi Xingui, > > If we increase scmd->allowed every time, and the device returns UNC for > too many times, will the other IO pending for too long and cause > hungtask? And also the runtime check in scsi_cmd_runtime_exceeced() will > not trigger since cmd->allowed is extended. > Thank you for your reply. In scenarios similar to UNC error, where a disk returns an error through D2H or SDB, no error is reported for other I/Os in the disk. In this case, AHCI will increase the number of retry times for other I/Os, and AHCI may face similar problems you say, but default failures may not be very good for users. In addition, for commands with pass through type, other I/Os are immediately returned with default errors and are not retried, but AHCI only report one single error I/O. Thanks, Xingui > Thanks, > Jason > >> >> Signed-off-by: Xingui Yang <yangxingui@huawei.com> >> --- >> drivers/scsi/libsas/sas_ata.c | 4 ++-- >> 1 file changed, 2 insertions(+), 2 deletions(-) >> >> diff --git a/drivers/scsi/libsas/sas_ata.c >> b/drivers/scsi/libsas/sas_ata.c >> index 77714a495cbb..f5047e8dcb59 100644 >> --- a/drivers/scsi/libsas/sas_ata.c >> +++ b/drivers/scsi/libsas/sas_ata.c >> @@ -949,8 +949,8 @@ void sas_ata_device_link_abort(struct >> domain_device *device, bool force_reset) >> unsigned long flags; >> spin_lock_irqsave(ap->lock, flags); >> - device->sata_dev.fis[2] = ATA_ERR | ATA_DRDY; /* tf status */ >> - device->sata_dev.fis[3] = ATA_ABORTED; /* tf error */ >> + device->sata_dev.fis[2] = ATA_DRDY; /* tf status */ >> + device->sata_dev.fis[3] = 0; /* tf error */ >> link->eh_info.err_mask |= AC_ERR_DEV; >> if (force_reset) >> > .
On 2023/4/17 16:18, yangxingui wrote: > Hi Jason > > On 2023/4/14 15:36, Jason Yan wrote: >> On 2023/4/7 11:56, Xingui Yang wrote: >>> If the disk returns UNC for more than five times within a short >>> period, the >>> number of retry times for other I/Os may reach scmd->allowed, and the >>> default error "Illegal Request" is returned for other I/Os, as follows: >>> >>> [ 273.801770] hisi_sas_v3_hw 0000:b4:02.0: erroneous completion disk >>> err dev id=2 sas_addr=0x5000000000000605 CQ hdr: 0x400903 0x20103 0x0 >>> 0x80470000 >>> [ 273.875286] sas: Enter sas_scsi_recover_host busy: 30 failed: 30 >>> [ 273.879895] sas: trying to find task 0x00000000d9cfc893 >>> [ 273.879896] sas: sas_scsi_find_task: aborting task 0x00000000d9cfc893 >>> [ 273.880054] sas: sas_scsi_find_task: task 0x00000000d9cfc893 is done >>> [ 273.880055] sas: sas_eh_handle_sas_errors: task 0x00000000d9cfc893 >>> is done >>> [ 273.880236] ata6.00: failed command: READ FPDMA QUEUED >>> [ 273.880238] ata6.00: cmd 60/08:00:59:27:00/00:00:00:00:00/40 tag >>> 22 ncq dma 4096 in >>> res 41/04:00:20:00:00/00:00:00:00:00/00 >>> Emask 0x1 (device error) >>> [ 273.880239] ata6.00: status: { DRDY ERR } >>> [ 273.880240] ata6.00: error: { ABRT } >>> [ 273.880241] ata6.00: failed command: READ FPDMA QUEUED >>> [ 273.880243] ata6.00: cmd 60/90:00:d1:26:00/00:00:00:00:00/40 tag >>> 23 ncq dma 73728 in >>> res 41/40:90:10:27:00/00:00:00:00:00/00 >>> Emask 0x409 (media error) <F> >>> [ 273.880245] ata6.00: status: { DRDY ERR } >>> [ 273.880246] ata6.00: error: { UNC } >>> [ 273.880247] ata6.00: failed command: READ FPDMA QUEUED >>> [ 273.880249] ata6.00: cmd 60/08:00:19:27:00/00:00:00:00:00/40 tag >>> 24 ncq dma 4096 in >>> res 41/04:00:20:00:00/00:00:00:00:00/00 >>> Emask 0x1 (device error) >>> [ 273.880250] ata6.00: status: { DRDY ERR } >>> [ 273.880251] ata6.00: error: { ABRT } >>> [ 274.199477] scmd->retries: 3, scmd->allowed: 5 >>> [ 274.199478] scmd->retries: 3, scmd->allowed: 5 >>> [ 274.199479] scmd->retries: 3, scmd->allowed: 5 >>> [ 274.199481] scmd->retries: 3, scmd->allowed: 5 >>> [ 274.199482] scmd->retries: 3, scmd->allowed: 5 >>> [ 274.199483] scmd->retries: 2, scmd->allowed: 5 >>> [ 274.199484] scmd->retries: 3, scmd->allowed: 5 >>> [ 274.199485] scmd->retries: 3, scmd->allowed: 5 >>> [ 274.199486] scmd->retries: 5, scmd->allowed: 5 >>> [ 274.199487] scmd->retries: 2, scmd->allowed: 5 >>> [ 274.199488] scmd->retries: 2, scmd->allowed: 5 >>> [ 274.199524] sd 6:0:1:0: [sdb] tag#258 FAILED Result: >>> hostbyte=DID_OK driverbyte=DRIVER_SENSE >>> [ 274.199527] sd 6:0:1:0: [sdb] tag#258 Sense Key : Illegal Request >>> [current] >>> [ 274.199530] sd 6:0:1:0: [sdb] tag#258 Add. Sense: Unaligned write >>> command >>> [ 274.199532] sd 6:0:1:0: [sdb] tag#258 CDB: Read(10) 28 00 00 00 27 >>> 59 00 00 08 00 >>> [ 274.199535] print_req_error: I/O error, dev sdb, sector 10073 >>> [ 274.199573] sd 6:0:1:0: [sdb] tag#259 FAILED Result: >>> hostbyte=DID_OK driverbyte=DRIVER_SENSE >>> [ 274.199574] sd 6:0:1:0: [sdb] tag#259 Sense Key : Medium Error >>> [current] >>> [ 274.199576] sd 6:0:1:0: [sdb] tag#259 Add. Sense: Unrecovered read >>> error - auto reallocate failed >>> [ 274.199578] sd 6:0:1:0: [sdb] tag#259 CDB: Read(10) 28 00 00 00 26 >>> d1 00 00 90 00 >>> [ 274.199579] print_req_error: I/O error, dev sdb, sector 10000 >>> [ 274.199608] ata6: EH complete >>> [ 274.199615] sas: --- Exit sas_scsi_recover_host: busy: 0 failed: >>> 30 tries: 1 >>> >>> As mentioned in ata_eh_qc_retry(), if qc->err_mask is zero then >>> increment >>> scmd->allowed. So set tf to normal may be better. >> >> Hi Xingui, >> >> If we increase scmd->allowed every time, and the device returns UNC >> for too many times, will the other IO pending for too long and cause >> hungtask? And also the runtime check in scsi_cmd_runtime_exceeced() >> will not trigger since cmd->allowed is extended. >> > Thank you for your reply. In scenarios similar to UNC error, where a > disk returns an error through D2H or SDB, no error is reported for other > I/Os in the disk. In this case, AHCI will increase the number of retry > times for other I/Os, and AHCI may face similar problems you say, but > default failures may not be very good for users. I think at least we cannot always retry unconditionally. Failure is better than hung becuase users can deal with failures. They can retry from the userspace. But if the process stuck in kernel, it is a disaster for the userspace and they can do nothing. Is there a way to limit the times of retry? Thanks, Jason > > In addition, for commands with pass through type, other I/Os are > immediately returned with default errors and are not retried, but AHCI > only report one single error I/O. > > Thanks, > Xingui > >> Thanks, >> Jason >> >>> >>> Signed-off-by: Xingui Yang <yangxingui@huawei.com> >>> --- >>> drivers/scsi/libsas/sas_ata.c | 4 ++-- >>> 1 file changed, 2 insertions(+), 2 deletions(-) >>> >>> diff --git a/drivers/scsi/libsas/sas_ata.c >>> b/drivers/scsi/libsas/sas_ata.c >>> index 77714a495cbb..f5047e8dcb59 100644 >>> --- a/drivers/scsi/libsas/sas_ata.c >>> +++ b/drivers/scsi/libsas/sas_ata.c >>> @@ -949,8 +949,8 @@ void sas_ata_device_link_abort(struct >>> domain_device *device, bool force_reset) >>> unsigned long flags; >>> spin_lock_irqsave(ap->lock, flags); >>> - device->sata_dev.fis[2] = ATA_ERR | ATA_DRDY; /* tf status */ >>> - device->sata_dev.fis[3] = ATA_ABORTED; /* tf error */ >>> + device->sata_dev.fis[2] = ATA_DRDY; /* tf status */ >>> + device->sata_dev.fis[3] = 0; /* tf error */ >>> link->eh_info.err_mask |= AC_ERR_DEV; >>> if (force_reset) >>> >> . > .
On 2023/4/26 9:41, Jason Yan wrote: > On 2023/4/17 16:18, yangxingui wrote: >> Hi Jason >> >> On 2023/4/14 15:36, Jason Yan wrote: >>> On 2023/4/7 11:56, Xingui Yang wrote: >>>> If the disk returns UNC for more than five times within a short >>>> period, the >>>> number of retry times for other I/Os may reach scmd->allowed, and the >>>> default error "Illegal Request" is returned for other I/Os, as follows: >>>> >>>> [ 273.801770] hisi_sas_v3_hw 0000:b4:02.0: erroneous completion >>>> disk err dev id=2 sas_addr=0x5000000000000605 CQ hdr: 0x400903 >>>> 0x20103 0x0 0x80470000 >>>> [ 273.875286] sas: Enter sas_scsi_recover_host busy: 30 failed: 30 >>>> [ 273.879895] sas: trying to find task 0x00000000d9cfc893 >>>> [ 273.879896] sas: sas_scsi_find_task: aborting task >>>> 0x00000000d9cfc893 >>>> [ 273.880054] sas: sas_scsi_find_task: task 0x00000000d9cfc893 is done >>>> [ 273.880055] sas: sas_eh_handle_sas_errors: task >>>> 0x00000000d9cfc893 is done >>>> [ 273.880236] ata6.00: failed command: READ FPDMA QUEUED >>>> [ 273.880238] ata6.00: cmd 60/08:00:59:27:00/00:00:00:00:00/40 tag >>>> 22 ncq dma 4096 in >>>> res 41/04:00:20:00:00/00:00:00:00:00/00 >>>> Emask 0x1 (device error) >>>> [ 273.880239] ata6.00: status: { DRDY ERR } >>>> [ 273.880240] ata6.00: error: { ABRT } >>>> [ 273.880241] ata6.00: failed command: READ FPDMA QUEUED >>>> [ 273.880243] ata6.00: cmd 60/90:00:d1:26:00/00:00:00:00:00/40 tag >>>> 23 ncq dma 73728 in >>>> res 41/40:90:10:27:00/00:00:00:00:00/00 >>>> Emask 0x409 (media error) <F> >>>> [ 273.880245] ata6.00: status: { DRDY ERR } >>>> [ 273.880246] ata6.00: error: { UNC } >>>> [ 273.880247] ata6.00: failed command: READ FPDMA QUEUED >>>> [ 273.880249] ata6.00: cmd 60/08:00:19:27:00/00:00:00:00:00/40 tag >>>> 24 ncq dma 4096 in >>>> res 41/04:00:20:00:00/00:00:00:00:00/00 >>>> Emask 0x1 (device error) >>>> [ 273.880250] ata6.00: status: { DRDY ERR } >>>> [ 273.880251] ata6.00: error: { ABRT } >>>> [ 274.199477] scmd->retries: 3, scmd->allowed: 5 >>>> [ 274.199478] scmd->retries: 3, scmd->allowed: 5 >>>> [ 274.199479] scmd->retries: 3, scmd->allowed: 5 >>>> [ 274.199481] scmd->retries: 3, scmd->allowed: 5 >>>> [ 274.199482] scmd->retries: 3, scmd->allowed: 5 >>>> [ 274.199483] scmd->retries: 2, scmd->allowed: 5 >>>> [ 274.199484] scmd->retries: 3, scmd->allowed: 5 >>>> [ 274.199485] scmd->retries: 3, scmd->allowed: 5 >>>> [ 274.199486] scmd->retries: 5, scmd->allowed: 5 >>>> [ 274.199487] scmd->retries: 2, scmd->allowed: 5 >>>> [ 274.199488] scmd->retries: 2, scmd->allowed: 5 >>>> [ 274.199524] sd 6:0:1:0: [sdb] tag#258 FAILED Result: >>>> hostbyte=DID_OK driverbyte=DRIVER_SENSE >>>> [ 274.199527] sd 6:0:1:0: [sdb] tag#258 Sense Key : Illegal Request >>>> [current] >>>> [ 274.199530] sd 6:0:1:0: [sdb] tag#258 Add. Sense: Unaligned write >>>> command >>>> [ 274.199532] sd 6:0:1:0: [sdb] tag#258 CDB: Read(10) 28 00 00 00 >>>> 27 59 00 00 08 00 >>>> [ 274.199535] print_req_error: I/O error, dev sdb, sector 10073 >>>> [ 274.199573] sd 6:0:1:0: [sdb] tag#259 FAILED Result: >>>> hostbyte=DID_OK driverbyte=DRIVER_SENSE >>>> [ 274.199574] sd 6:0:1:0: [sdb] tag#259 Sense Key : Medium Error >>>> [current] >>>> [ 274.199576] sd 6:0:1:0: [sdb] tag#259 Add. Sense: Unrecovered >>>> read error - auto reallocate failed >>>> [ 274.199578] sd 6:0:1:0: [sdb] tag#259 CDB: Read(10) 28 00 00 00 >>>> 26 d1 00 00 90 00 >>>> [ 274.199579] print_req_error: I/O error, dev sdb, sector 10000 >>>> [ 274.199608] ata6: EH complete >>>> [ 274.199615] sas: --- Exit sas_scsi_recover_host: busy: 0 failed: >>>> 30 tries: 1 >>>> >>>> As mentioned in ata_eh_qc_retry(), if qc->err_mask is zero then >>>> increment >>>> scmd->allowed. So set tf to normal may be better. >>> >>> Hi Xingui, >>> >>> If we increase scmd->allowed every time, and the device returns UNC >>> for too many times, will the other IO pending for too long and cause >>> hungtask? And also the runtime check in scsi_cmd_runtime_exceeced() >>> will not trigger since cmd->allowed is extended. >>> >> Thank you for your reply. In scenarios similar to UNC error, where a >> disk returns an error through D2H or SDB, no error is reported for >> other I/Os in the disk. In this case, AHCI will increase the number of >> retry times for other I/Os, and AHCI may face similar problems you >> say, but default failures may not be very good for users. > Hi Jason > I think at least we cannot always retry unconditionally. Failure is > better than hung becuase users can deal with failures. They can retry > from the userspace. But if the process stuck in kernel, it is a disaster > for the userspace and they can do nothing. Is there a way to limit the > times of retry During this period, the user will receive the I/O error of UNC all the time unless the user stops accessing the disk. Thanks, Xingui > > Thanks, > Jason > >> >> In addition, for commands with pass through type, other I/Os are >> immediately returned with default errors and are not retried, but AHCI >> only report one single error I/O. >> >> Thanks, >> Xingui >> >>> Thanks, >>> Jason >>> >>>> >>>> Signed-off-by: Xingui Yang <yangxingui@huawei.com> >>>> --- >>>> drivers/scsi/libsas/sas_ata.c | 4 ++-- >>>> 1 file changed, 2 insertions(+), 2 deletions(-) >>>> >>>> diff --git a/drivers/scsi/libsas/sas_ata.c >>>> b/drivers/scsi/libsas/sas_ata.c >>>> index 77714a495cbb..f5047e8dcb59 100644 >>>> --- a/drivers/scsi/libsas/sas_ata.c >>>> +++ b/drivers/scsi/libsas/sas_ata.c >>>> @@ -949,8 +949,8 @@ void sas_ata_device_link_abort(struct >>>> domain_device *device, bool force_reset) >>>> unsigned long flags; >>>> spin_lock_irqsave(ap->lock, flags); >>>> - device->sata_dev.fis[2] = ATA_ERR | ATA_DRDY; /* tf status */ >>>> - device->sata_dev.fis[3] = ATA_ABORTED; /* tf error */ >>>> + device->sata_dev.fis[2] = ATA_DRDY; /* tf status */ >>>> + device->sata_dev.fis[3] = 0; /* tf error */ >>>> link->eh_info.err_mask |= AC_ERR_DEV; >>>> if (force_reset) >>>> >>> . >> . > .
diff --git a/drivers/scsi/libsas/sas_ata.c b/drivers/scsi/libsas/sas_ata.c index 77714a495cbb..f5047e8dcb59 100644 --- a/drivers/scsi/libsas/sas_ata.c +++ b/drivers/scsi/libsas/sas_ata.c @@ -949,8 +949,8 @@ void sas_ata_device_link_abort(struct domain_device *device, bool force_reset) unsigned long flags; spin_lock_irqsave(ap->lock, flags); - device->sata_dev.fis[2] = ATA_ERR | ATA_DRDY; /* tf status */ - device->sata_dev.fis[3] = ATA_ABORTED; /* tf error */ + device->sata_dev.fis[2] = ATA_DRDY; /* tf status */ + device->sata_dev.fis[3] = 0; /* tf error */ link->eh_info.err_mask |= AC_ERR_DEV; if (force_reset)
If the disk returns UNC for more than five times within a short period, the number of retry times for other I/Os may reach scmd->allowed, and the default error "Illegal Request" is returned for other I/Os, as follows: [ 273.801770] hisi_sas_v3_hw 0000:b4:02.0: erroneous completion disk err dev id=2 sas_addr=0x5000000000000605 CQ hdr: 0x400903 0x20103 0x0 0x80470000 [ 273.875286] sas: Enter sas_scsi_recover_host busy: 30 failed: 30 [ 273.879895] sas: trying to find task 0x00000000d9cfc893 [ 273.879896] sas: sas_scsi_find_task: aborting task 0x00000000d9cfc893 [ 273.880054] sas: sas_scsi_find_task: task 0x00000000d9cfc893 is done [ 273.880055] sas: sas_eh_handle_sas_errors: task 0x00000000d9cfc893 is done [ 273.880236] ata6.00: failed command: READ FPDMA QUEUED [ 273.880238] ata6.00: cmd 60/08:00:59:27:00/00:00:00:00:00/40 tag 22 ncq dma 4096 in res 41/04:00:20:00:00/00:00:00:00:00/00 Emask 0x1 (device error) [ 273.880239] ata6.00: status: { DRDY ERR } [ 273.880240] ata6.00: error: { ABRT } [ 273.880241] ata6.00: failed command: READ FPDMA QUEUED [ 273.880243] ata6.00: cmd 60/90:00:d1:26:00/00:00:00:00:00/40 tag 23 ncq dma 73728 in res 41/40:90:10:27:00/00:00:00:00:00/00 Emask 0x409 (media error) <F> [ 273.880245] ata6.00: status: { DRDY ERR } [ 273.880246] ata6.00: error: { UNC } [ 273.880247] ata6.00: failed command: READ FPDMA QUEUED [ 273.880249] ata6.00: cmd 60/08:00:19:27:00/00:00:00:00:00/40 tag 24 ncq dma 4096 in res 41/04:00:20:00:00/00:00:00:00:00/00 Emask 0x1 (device error) [ 273.880250] ata6.00: status: { DRDY ERR } [ 273.880251] ata6.00: error: { ABRT } [ 274.199477] scmd->retries: 3, scmd->allowed: 5 [ 274.199478] scmd->retries: 3, scmd->allowed: 5 [ 274.199479] scmd->retries: 3, scmd->allowed: 5 [ 274.199481] scmd->retries: 3, scmd->allowed: 5 [ 274.199482] scmd->retries: 3, scmd->allowed: 5 [ 274.199483] scmd->retries: 2, scmd->allowed: 5 [ 274.199484] scmd->retries: 3, scmd->allowed: 5 [ 274.199485] scmd->retries: 3, scmd->allowed: 5 [ 274.199486] scmd->retries: 5, scmd->allowed: 5 [ 274.199487] scmd->retries: 2, scmd->allowed: 5 [ 274.199488] scmd->retries: 2, scmd->allowed: 5 [ 274.199524] sd 6:0:1:0: [sdb] tag#258 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE [ 274.199527] sd 6:0:1:0: [sdb] tag#258 Sense Key : Illegal Request [current] [ 274.199530] sd 6:0:1:0: [sdb] tag#258 Add. Sense: Unaligned write command [ 274.199532] sd 6:0:1:0: [sdb] tag#258 CDB: Read(10) 28 00 00 00 27 59 00 00 08 00 [ 274.199535] print_req_error: I/O error, dev sdb, sector 10073 [ 274.199573] sd 6:0:1:0: [sdb] tag#259 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE [ 274.199574] sd 6:0:1:0: [sdb] tag#259 Sense Key : Medium Error [current] [ 274.199576] sd 6:0:1:0: [sdb] tag#259 Add. Sense: Unrecovered read error - auto reallocate failed [ 274.199578] sd 6:0:1:0: [sdb] tag#259 CDB: Read(10) 28 00 00 00 26 d1 00 00 90 00 [ 274.199579] print_req_error: I/O error, dev sdb, sector 10000 [ 274.199608] ata6: EH complete [ 274.199615] sas: --- Exit sas_scsi_recover_host: busy: 0 failed: 30 tries: 1 As mentioned in ata_eh_qc_retry(), if qc->err_mask is zero then increment scmd->allowed. So set tf to normal may be better. Signed-off-by: Xingui Yang <yangxingui@huawei.com> --- drivers/scsi/libsas/sas_ata.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)