Merge SCSI misc branch into isci-for-3.6 tag

[firefly-linux-kernel-4.4.55.git] / drivers / ata / libata-core.c

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 8e1039c8e15975aced4e6a359dc4a0451a58bc4b..abd729fc094ad2985a319c90551a936ff98756b0 100644 (file)
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -5253,16 +5253,20 @@ 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);
        }
@@ -5271,10 +5275,10 @@ 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) {
@@ -5287,7 +5291,7 @@ 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);
        }
@@ -5295,9 +5299,8 @@ 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;
 
@@ -5312,10 +5315,17 @@ 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))
@@ -5340,16 +5350,22 @@ 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;
@@ -5382,6 +5398,24 @@ 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
@@ -5927,24 +5961,18 @@ int ata_host_start(struct ata_host *host)
 }
 
 /**
- *     ata_sas_host_init - Initialize a host struct
+ *     ata_sas_host_init - Initialize a host struct for sas (ipr, libsas)
  *     @host:  host to initialize
  *     @dev:   device host is attached to
- *     @flags: host flags
  *     @ops:   port_ops
  *
- *     LOCKING:
- *     PCI/etc. bus probe sem.
- *
  */
-/* KILLME - the only user left is ipr */
 void ata_host_init(struct ata_host *host, struct device *dev,
-                  unsigned long flags, struct ata_port_operations *ops)
+                  struct ata_port_operations *ops)
 {
        spin_lock_init(&host->lock);
        mutex_init(&host->eh_mutex);
        host->dev = dev;
-       host->flags = flags;
        host->ops = ops;
 }
 
@@ -6388,6 +6416,7 @@ static int __init ata_parse_force_one(char **cur,
                { "nohrst",     .lflags         = ATA_LFLAG_NO_HRST },
                { "nosrst",     .lflags         = ATA_LFLAG_NO_SRST },
                { "norst",      .lflags         = ATA_LFLAG_NO_HRST | ATA_LFLAG_NO_SRST },
+               { "rstonce",    .lflags         = ATA_LFLAG_RST_ONCE },
        };
        char *start = *cur, *p = *cur;
        char *id, *val, *endp;