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authorDan Williams <dan.j.williams@intel.com>2012-06-21 23:41:51 -0700
committerJames Bottomley <JBottomley@Parallels.com>2012-08-24 13:10:23 +0400
commit303694eeee5eacad5b84105a15afd9e351e1891b (patch)
treeba8e16274ffbde39b21100ced62b5b11e8c926d6 /include/scsi/sas_ata.h
parent2fcbdcb4c802fe40d6827dbc365dac90cfe8c0a3 (diff)
downloadop-kernel-dev-303694eeee5eacad5b84105a15afd9e351e1891b.zip
op-kernel-dev-303694eeee5eacad5b84105a15afd9e351e1891b.tar.gz
[SCSI] libsas: suspend / resume support
libsas power management routines to suspend and recover the sas domain based on a model where the lldd is allowed and expected to be "forgetful". sas_suspend_ha - disable event processing allowing the lldd to take down links without concern for causing hotplug events. Regardless of whether the lldd actually posts link down messages libsas notifies the lldd that all domain_devices are gone. sas_prep_resume_ha - on the way back up before the lldd starts link training clean out any spurious events that were generated on the way down, and re-enable event processing sas_resume_ha - after the lldd has started and decided that all phys have posted link-up events this routine is called to let libsas start it's own timeout of any phys that did not resume. After the timeout an lldd can cancel the phy teardown by posting a link-up event. Storage for ex_change_count (u16) and phy_change_count (u8) are changed to int so they can be set to -1 to indicate 'invalidated'. Signed-off-by: Dan Williams <dan.j.williams@intel.com> Reviewed-by: Jacek Danecki <jacek.danecki@intel.com> Tested-by: Maciej Patelczyk <maciej.patelczyk@intel.com> Acked-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Diffstat (limited to 'include/scsi/sas_ata.h')
-rw-r--r--include/scsi/sas_ata.h10
1 files changed, 10 insertions, 0 deletions
diff --git a/include/scsi/sas_ata.h b/include/scsi/sas_ata.h
index 2dfbdaa..ff71a56 100644
--- a/include/scsi/sas_ata.h
+++ b/include/scsi/sas_ata.h
@@ -45,6 +45,8 @@ void sas_ata_eh(struct Scsi_Host *shost, struct list_head *work_q,
void sas_ata_schedule_reset(struct domain_device *dev);
void sas_ata_wait_eh(struct domain_device *dev);
void sas_probe_sata(struct asd_sas_port *port);
+void sas_suspend_sata(struct asd_sas_port *port);
+void sas_resume_sata(struct asd_sas_port *port);
void sas_ata_end_eh(struct ata_port *ap);
#else
@@ -82,6 +84,14 @@ static inline void sas_probe_sata(struct asd_sas_port *port)
{
}
+static inline void sas_suspend_sata(struct asd_sas_port *port)
+{
+}
+
+static inline void sas_resume_sata(struct asd_sas_port *port)
+{
+}
+
static inline int sas_get_ata_info(struct domain_device *dev, struct ex_phy *phy)
{
return 0;
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