[SCSI] libata: export ata_port suspend/resume infrastructure for sas

Reuse ata_port_{suspend|resume}_common for sas.  This path is chosen
over adding coordination between ata-tranport and sas-transport because
libsas wants to revalidate the domain at resume-time at the host level.
It can not validate links have resumed properly until libata has had a
chance to perform its revalidation, and any sane placing of an ata_port
in the sas-transport model would delay it's resumption until after the
host.

Export the common portion of port suspend/resume (bypass pm_runtime),
and allow sas to perform these operations asynchronously (similar to the
libsas async-ata probe implmentation).  Async operation is determined by
having an external, rather than stack based, location for storing the
result of the operation.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Jacek Danecki <jacek.danecki@intel.com>
Acked-by: Jeff Garzik <jgarzik@redhat.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

2 files changed, 57 insertions, 12 deletions

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 70964aabcb89..09657c372d3b 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -5252,16 +5252,20 @@ bool ata_link_offline(struct ata_link *link)
 #ifdef CONFIG_PM
 static int ata_port_request_pm(struct ata_port *ap, pm_message_t mesg,
                                unsigned int action, unsigned int ehi_flags,
-                               int wait)
+                               int *async)
 {
         struct ata_link *link;
         unsigned long flags;
-        int rc;
+        int rc = 0;
 
         /* Previous resume operation might still be in
          * progress.  Wait for PM_PENDING to clear.
          */
         if (ap->pflags & ATA_PFLAG_PM_PENDING) {
+                if (async) {
+                        *async = -EAGAIN;
+                        return 0;
+                }
                 ata_port_wait_eh(ap);
                 WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
         }
@@ -5270,10 +5274,10 @@ static int ata_port_request_pm(struct ata_port *ap, pm_message_t mesg,
         spin_lock_irqsave(ap->lock, flags);
 
         ap->pm_mesg = mesg;
-        if (wait) {
-                rc = 0;
+        if (async)
+                ap->pm_result = async;
+        else
                 ap->pm_result = &rc;
-        }
 
         ap->pflags |= ATA_PFLAG_PM_PENDING;
         ata_for_each_link(link, ap, HOST_FIRST) {
@@ -5286,7 +5290,7 @@ static int ata_port_request_pm(struct ata_port *ap, pm_message_t mesg,
         spin_unlock_irqrestore(ap->lock, flags);
 
         /* wait and check result */
-        if (wait) {
+        if (!async) {
                 ata_port_wait_eh(ap);
                 WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
         }
@@ -5294,9 +5298,8 @@ static int ata_port_request_pm(struct ata_port *ap, pm_message_t mesg,
         return rc;
 }
 
-static int ata_port_suspend_common(struct device *dev, pm_message_t mesg)
+static int __ata_port_suspend_common(struct ata_port *ap, pm_message_t mesg, int *async)
 {
-        struct ata_port *ap = to_ata_port(dev);
         unsigned int ehi_flags = ATA_EHI_QUIET;
         int rc;
 
@@ -5311,10 +5314,17 @@ static int ata_port_suspend_common(struct device *dev, pm_message_t mesg)
         if (mesg.event == PM_EVENT_SUSPEND)
                 ehi_flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_NO_RECOVERY;
 
-        rc = ata_port_request_pm(ap, mesg, 0, ehi_flags, 1);
+        rc = ata_port_request_pm(ap, mesg, 0, ehi_flags, async);
         return rc;
 }
 
+static int ata_port_suspend_common(struct device *dev, pm_message_t mesg)
+{
+        struct ata_port *ap = to_ata_port(dev);
+
+        return __ata_port_suspend_common(ap, mesg, NULL);
+}
+
 static int ata_port_suspend(struct device *dev)
 {
         if (pm_runtime_suspended(dev))
@@ -5339,16 +5349,22 @@ static int ata_port_poweroff(struct device *dev)
         return ata_port_suspend_common(dev, PMSG_HIBERNATE);
 }
 
-static int ata_port_resume_common(struct device *dev)
+static int __ata_port_resume_common(struct ata_port *ap, int *async)
 {
-        struct ata_port *ap = to_ata_port(dev);
         int rc;
 
         rc = ata_port_request_pm(ap, PMSG_ON, ATA_EH_RESET,
-                ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET, 1);
+                ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET, async);
         return rc;
 }
 
+static int ata_port_resume_common(struct device *dev)
+{
+        struct ata_port *ap = to_ata_port(dev);
+
+        return __ata_port_resume_common(ap, NULL);
+}
+
 static int ata_port_resume(struct device *dev)
 {
         int rc;
@@ -5381,6 +5397,24 @@ static const struct dev_pm_ops ata_port_pm_ops = {
         .runtime_idle = ata_port_runtime_idle,
 };
 
+/* sas ports don't participate in pm runtime management of ata_ports,
+ * and need to resume ata devices at the domain level, not the per-port
+ * level. sas suspend/resume is async to allow parallel port recovery
+ * since sas has multiple ata_port instances per Scsi_Host.
+ */
+int ata_sas_port_async_suspend(struct ata_port *ap, int *async)
+{
+        return __ata_port_suspend_common(ap, PMSG_SUSPEND, async);
+}
+EXPORT_SYMBOL_GPL(ata_sas_port_async_suspend);
+
+int ata_sas_port_async_resume(struct ata_port *ap, int *async)
+{
+        return __ata_port_resume_common(ap, async);
+}
+EXPORT_SYMBOL_GPL(ata_sas_port_async_resume);
+
+
 /**
  *      ata_host_suspend - suspend host
  *      @host: host to suspend
diff --git a/include/linux/libata.h b/include/linux/libata.h
index 31a2853e9530..cc834e1136b2 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -1013,6 +1013,17 @@ extern bool ata_link_offline(struct ata_link *link);
 #ifdef CONFIG_PM
 extern int ata_host_suspend(struct ata_host *host, pm_message_t mesg);
 extern void ata_host_resume(struct ata_host *host);
+extern int ata_sas_port_async_suspend(struct ata_port *ap, int *async);
+extern int ata_sas_port_async_resume(struct ata_port *ap, int *async);
+#else
+static inline int ata_sas_port_async_suspend(struct ata_port *ap, int *async)
+{
+        return 0;
+}
+static inline int ata_sas_port_async_resume(struct ata_port *ap, int *async)
+{
+        return 0;
+}
 #endif
 extern int ata_ratelimit(void);
 extern void ata_msleep(struct ata_port *ap, unsigned int msecs);