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@xxxxxxxxxxxxxxxxxxxx Reporter: ssiwinski@xxxxxxxxxxxx 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. -- You are receiving this mail because: You are watching the assignee of the bug.
