3  *  libata-eh.c - libata error handling
121 /* The following table determines timeouts to use for EH internal
324  *	EH context.
347  *	Notify EH that internal command @cmd for @dev timed out.  This
352  *	EH context.
442 		/* doesn't make sense for port-wide EH actions */  in ata_eh_clear_action()
459  *	ata_eh_acquire - acquire EH ownership
460  *	@ap: ATA port to acquire EH ownership for
462  *	Acquire EH ownership for @ap.  This is the basic exclusion
464  *	the same host can claim the ownership of EH.
467  *	EH context.
477  *	ata_eh_release - release EH ownership
478  *	@ap: ATA port to release EH ownership for
480  *	Release EH ownership for @ap if the caller.  The caller must
481  *	have acquired EH ownership using ata_eh_acquire() previously.
484  *	EH context.
575 	/* For new EH, all qcs are finished in one of three ways -  in ata_scsi_cmd_error_handler()
578 	 * completion wins, the qc never reaches EH.  When error  in ata_scsi_cmd_error_handler()
631 		/* If we have timed out qcs.  They belong to EH from  in ata_scsi_cmd_error_handler()
665 		/* acquire EH ownership */  in ata_scsi_port_error_handler()
674 		/* fetch & clear EH info */  in ata_scsi_port_error_handler()
696 		ap->excl_link = NULL;	/* don't maintain exclusion over EH */  in ata_scsi_port_error_handler()
700 		/* invoke EH, skip if unloading or suspended */  in ata_scsi_port_error_handler()
716 		 * EH in such case.  in ata_scsi_port_error_handler()
726 				     "EH pending after %d tries, giving up\n",  in ata_scsi_port_error_handler()
731 		/* this run is complete, make sure EH info is clear */  in ata_scsi_port_error_handler()
735 		/* end eh (clear host_eh_scheduled) while holding  in ata_scsi_port_error_handler()
737 		 * point but before EH completion, SCSI midlayer will  in ata_scsi_port_error_handler()
738 		 * re-initiate EH.  in ata_scsi_port_error_handler()
761 		ata_port_info(ap, "EH complete\n");  in ata_scsi_port_error_handler()
774  *	ata_port_wait_eh - Wait for the currently pending EH to complete
775  *	@ap: Port to wait EH for
777  *	Wait until the currently pending EH is complete.
800 	/* make sure SCSI EH is complete */  in ata_port_wait_eh()
868  *	is non-zero and EH wasn't pending before.  Fast drain ensures
869  *	that EH kicks in in timely manner.
903  *	Schedule error handling for @qc.  EH will kick in as soon as
919 	 * ata_scsi_error() takes care of such scmds on EH entry.  in ata_qc_schedule_eh()
927  * ata_std_sched_eh - non-libsas ata_ports issue eh with this common routine
928  * @ap: ATA port to schedule EH for
943 	DPRINTK("port EH scheduled\n");  in ata_std_sched_eh()
948  * ata_std_end_eh - non-libsas ata_ports complete eh with this common routine
949  * @ap: ATA port to end EH for
970  *	@ap: ATA port to schedule EH for
972  *	Schedule error handling for @ap.  EH will kick in as soon as
1014  *	Abort all active qc's active on @link and schedule EH.
1032  *	Abort all active qc's of @ap and schedule EH.
1104  *	ata_eh_freeze_port - EH helper to freeze port
1126  *	ata_eh_thaw_port - EH helper to thaw port
1174  *	ata_eh_qc_complete - Complete an active ATA command from EH
1178  *	completed.  To be used from EH.
1188  *	ata_eh_qc_retry - Tell midlayer to retry an ATA command after EH
1192  *	should be retried.  To be used from EH.
1213  *	EH context.
1260 	/* clear per-dev EH info */  in ata_eh_detach_dev()
1275  *	Called just before performing EH actions to clear related bits
1276  *	in @link->eh_info such that eh actions are not unnecessarily
1294 	/* About to take EH action, set RECOVERED.  Ignore actions on  in ata_eh_about_to_do()
1304  *	ata_eh_done - EH action complete
1305  *	@link: ATA link for which EH actions are complete
1309  *	Called right after performing EH actions to clear related bits
1370  *	EH context (may sleep).
1399  *	SENSE.  This function is an EH helper.
1450  *	SENSE.  This function is EH helper.
2007 	/* enforce default EH actions */  in ata_eh_link_autopsy()
2016 	 * perform per-dev EH action only on the offending device.  in ata_eh_link_autopsy()
2214  *	@link: ATA link EH is going on
2216  *	Report EH to user.
2412  *	@ap: ATA port to report EH about
2414  *	Report EH to user.
2599 		/* mark that this EH session started with reset */  in ata_eh_reset()
2790 		 * repeated EH runs but seems to be a better tradeoff than  in ata_eh_reset()
2843 	 * requirements of ATA_EH_PARK handling. Since the EH thread  in ata_eh_pull_park_action()
3098  *	EH context (may sleep).
3152  *	0 if EH can continue, -errno if EH needs to be repeated.
3190 		 * successfully complete a failed command from EH.  in ata_eh_maybe_retry_flush()
3225  *	EH context.
3468 	/* -EAGAIN from EH routine indicates retry without prejudice.  in ata_eh_handle_dev_fail()
3591 	/* prep for EH */  in ata_eh_recover()
3595 		/* skip EH if possible. */  in ata_eh_recover()
3684 		/* if PMP got attached, return, pmp EH will take care of it */  in ata_eh_recover()
3762  *	ata_eh_finish - finish up EH
3763  *	@ap: host port to finish EH for
3765  *	Recovery is complete.  Clean up EH states and retry or finish
3782 			/* FIXME: Once EH migration is complete,  in ata_eh_finish()
3801 	/* make sure nr_active_links is zero after EH */  in ata_eh_finish()