Lines Matching refs:EH

2 SCSI EH
11 [1] How SCSI commands travel through the midlayer and to EH
16     [1-3] How EH takes over
17 [2] How SCSI EH works
18     [2-1] EH through fine-grained callbacks
20 	[2-1-2] Flow of scmds through EH
22     [2-2] EH through transportt->eh_strategy_handler()
28 [1] How SCSI commands travel through the midlayer and to EH
35 per-device allocated scmd list and not of much interest to this EH
36 discussion.  The latter is used for completion and EH lists and unless
50  For all non-EH commands, scsi_done() is the completion callback.  It
123 [1-4] How EH takes over
125  scmds enter EH via scsi_eh_scmd_add(), which does the following.
136  5. Wakes up SCSI EH thread if shost->host_busy == shost->host_failed
146 shost->host_failed.  This wakes up SCSI EH thread.  So, once woken up,
147 SCSI EH thread can expect that all in-flight commands have failed and
159  We'll talk about how SCSI EH takes actions to abort - make LLDD
163 [2] How SCSI EH works
165  LLDD's can implement SCSI EH actions in one of the following two
168  - Fine-grained EH callbacks
169 	LLDD can implement fine-grained EH callbacks and let SCSI
178  Once recovery is complete, SCSI EH resumes normal operation by
193 [2-1] EH through fine-grained callbacks
198 of driving error handling.  EH's goals are two - make LLDD, host and
204  To achieve these goals, EH performs recovery actions with increasing
207 hostt EH callbacks.  Callbacks may be omitted and omitted ones are
217 highest-severity action means EH failure and results in offlining of
233  - EH reuses failed scmds to issue commands for recovery.  For
234    timed-out scmds, SCSI EH ensures that LLDD forgets about a scmd
235    before reusing it for EH commands.
237  When a scmd is recovered, the scmd is moved from eh_work_q to EH
244 EH), REQ_FAILFAST is not set and ++scmd->retries is less than
248 [2-1-2] Flow of scmds through EH
258  2. EH starts
259     ACTION: move all scmds to EH's local eh_work_q.  shost->eh_cmd_q
265     ACTION: scsi_eh_finish_cmd() is invoked to EH-finish scmd
272  4. EH completes
284  EH through fine-grained callbacks start from scsi_unjam_host().
306 	FAILED in such cases thus invoking SCSI EH.  When the scmd
370 	    all failed scmds on the sdev are EH-finished with
376 	    scmds.  Yet, this function EH-finish all scmds on the sdev
398 	    EH-finished.
406 	    all ready or offline sdevs on the host are EH-finished.
413 	    and EH-finish the scmds.
425 [2-2] EH through transportt->eh_strategy_handler()
431 it should perform SCSI EH maintenance chores to maintain integrity of