* [Bug 205461] New: Power-On-Reset Prevents Successful Receive Diagnostics Command in SES Module.
@ 2019-11-07 15:58 bugzilla-daemon
2019-11-07 16:00 ` [Bug 205461] " bugzilla-daemon
0 siblings, 1 reply; 2+ messages in thread
From: bugzilla-daemon @ 2019-11-07 15:58 UTC (permalink / raw)
To: linux-scsi
https://bugzilla.kernel.org/show_bug.cgi?id=205461
Bug ID: 205461
Summary: Power-On-Reset Prevents Successful Receive Diagnostics
Command in SES Module.
Product: SCSI Drivers
Version: 2.5
Kernel Version: 5.4-rc6
Hardware: All
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Other
Assignee: scsi_drivers-other@kernel-bugs.osdl.org
Reporter: ssiwinski@attotech.com
Regression: No
Created attachment 285817
--> https://bugzilla.kernel.org/attachment.cgi?id=285817&action=edit
Power-On-Reset Prevents Successful Receive Diagnostics Command
Overview:
When booting an SES device connected to an ATTO SAS HBA, the SES module issues
a 'Receive Diagnostics' command that fails with check condition power-on-reset
and is not retried by the SES module.
Interestingly, when booting an SES device connected to an LSI SAS HBA, the
Receive Diagnostics succeeds due to LSI issuing a 'Mode Sense' command prior to
the SES module sending the 'Receive Diagnostics' that clears the check
condition power-on-reset.
Us (ATTO) does not want to have to issue a command to clear the check condition
power-on-reset unless we must. There is no spec that states this is what must
happen and seems to be a case that the SES module should handle.
Steps to Reproduce:
With an ATTO SAS HBA:
Connect an SES device to an ATTO SAS HBA, then power on the SES device.
With an LSI SAS HBA:
I was able to reproduce this issue with an LSI SAS HBA and other SAS HBAs by
unloading the SES module, issuing a target reset to the SES device, then
re-loading the SES module.
Actual Results:
In the system log you will see
[ 953.809858] scsi 7:0:0:0: Power-on or device reset occurred
[ 953.809891] scsi 7:0:0:0: Failed to get diagnostic page 0x1
[ 953.809931] scsi 7:0:0:0: Failed to bind enclosure -19
This can also be observed in the "sas_poweron_atto.scs" SAS trace.
Expected Results:
The Receive Diagnostics command to succeed and no error logged to the system
log.
This can also be observed in a SAS trace of an SES device connected to an LSI
HBA, where the 'Receive Diagnostics' command succeeds due to the check
condition power-on-reset being cleared by the 'Mode Sense' command issued prior
to the 'Receive Diagnostics'. (Trace can be provided upon request).
Additional Information:
It appears that I cannot attach SAS traces from both ATTO and LSI devices, so I
have attached the trace while connected to an ATTO SAS HBA that clearly
exhibits the error. If both traces are needed, I can provide them by a
different means.
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* [Bug 205461] Power-On-Reset Prevents Successful Receive Diagnostics Command in SES Module.
2019-11-07 15:58 [Bug 205461] New: Power-On-Reset Prevents Successful Receive Diagnostics Command in SES Module bugzilla-daemon
@ 2019-11-07 16:00 ` bugzilla-daemon
0 siblings, 0 replies; 2+ messages in thread
From: bugzilla-daemon @ 2019-11-07 16:00 UTC (permalink / raw)
To: linux-scsi
https://bugzilla.kernel.org/show_bug.cgi?id=205461
Steven Siwinski (ssiwinski@attotech.com) changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |ssiwinski@attotech.com
--- Comment #1 from Steven Siwinski (ssiwinski@attotech.com) ---
Created attachment 285819
--> https://bugzilla.kernel.org/attachment.cgi?id=285819&action=edit
SAS trace of AVAGO HBA that issues 'mode sense' prior to SES sending 'Receive
Diagnostics'
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