[SCSI] isci: kill iphy->isci_port lookups

This field is a holdover from the OS abstraction conversion.  The stable
phy to port lookups are done via iphy->ownining_port under scic_lock.
After this conversion to use port->lldd_port the only volatile lookup is
the initial lookup in isci_port_formed().  After that point any lookup
via a successfully notified domain_device is guaranteed to be valid
until the domain_device is destroyed.

Delete ->start_complete as it is only set once and is set as a
consequence of the port going link up, by definition of getting a port
formed event the port is "ready".

While we are correcting port lookups also move the asd_sas_port table
out from under the isci_port.  This is to preclude any temptation to use
container_of() to convert an asd_sas_port to an isci_port, the
association is dynamic and under libsas control.

Tested-by: Maciej Trela <maciej.trela@intel.com>
[dmilburn@redhat.com: fix i686 compile error]
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

7 files changed, 83 insertions, 77 deletions

diff --git a/drivers/scsi/isci/host.h b/drivers/scsi/isci/host.h
index 5477f0fa8233..adbad69d1069 100644
--- a/drivers/scsi/isci/host.h
+++ b/drivers/scsi/isci/host.h
@@ -187,6 +187,7 @@ struct isci_host {
         int id; /* unique within a given pci device */
         struct isci_phy phys[SCI_MAX_PHYS];
         struct isci_port ports[SCI_MAX_PORTS + 1]; /* includes dummy port */
+        struct asd_sas_port sas_ports[SCI_MAX_PORTS];
         struct sas_ha_struct sas_ha;
 
         spinlock_t state_lock;
@@ -393,24 +394,6 @@ static inline int sci_remote_device_node_count(struct isci_remote_device *idev)
 #define sci_controller_clear_invalid_phy(controller, phy) \
         ((controller)->invalid_phy_mask &= ~(1 << (phy)->phy_index))
 
-static inline struct device *sciphy_to_dev(struct isci_phy *iphy)
-{
-
-        if (!iphy || !iphy->isci_port || !iphy->isci_port->isci_host)
-                return NULL;
-
-        return &iphy->isci_port->isci_host->pdev->dev;
-}
-
-static inline struct device *sciport_to_dev(struct isci_port *iport)
-{
-
-        if (!iport || !iport->isci_host)
-                return NULL;
-
-        return &iport->isci_host->pdev->dev;
-}
-
 static inline struct device *scirdev_to_dev(struct isci_remote_device *idev)
 {
         if (!idev || !idev->isci_port || !idev->isci_port->isci_host)
diff --git a/drivers/scsi/isci/init.c b/drivers/scsi/isci/init.c
index 7ba236e9fab2..c20fda090423 100644
--- a/drivers/scsi/isci/init.c
+++ b/drivers/scsi/isci/init.c
@@ -241,18 +241,13 @@ static int isci_register_sas_ha(struct isci_host *isci_host)
         if (!sas_ports)
                 return -ENOMEM;
 
-        /*----------------- Libsas Initialization Stuff----------------------
-         * Set various fields in the sas_ha struct:
-         */
-
         sas_ha->sas_ha_name = DRV_NAME;
         sas_ha->lldd_module = THIS_MODULE;
         sas_ha->sas_addr    = &isci_host->phys[0].sas_addr[0];
 
-        /* set the array of phy and port structs.  */
         for (i = 0; i < SCI_MAX_PHYS; i++) {
                 sas_phys[i] = &isci_host->phys[i].sas_phy;
-                sas_ports[i] = &isci_host->ports[i].sas_port;
+                sas_ports[i] = &isci_host->sas_ports[i];
         }
 
         sas_ha->sas_phy  = sas_phys;
diff --git a/drivers/scsi/isci/phy.c b/drivers/scsi/isci/phy.c
index fe18acfd6eb3..8d412ca689ad 100644
--- a/drivers/scsi/isci/phy.c
+++ b/drivers/scsi/isci/phy.c
@@ -67,6 +67,14 @@ enum sas_linkrate sci_phy_linkrate(struct isci_phy *iphy)
         return iphy->max_negotiated_speed;
 }
 
+static struct device *sciphy_to_dev(struct isci_phy *iphy)
+{
+        struct isci_phy *table = iphy - iphy->phy_index;
+        struct isci_host *ihost = container_of(table, typeof(*ihost), phys[0]);
+
+        return &ihost->pdev->dev;
+}
+
 static enum sci_status
 sci_phy_transport_layer_initialization(struct isci_phy *iphy,
                                        struct scu_transport_layer_registers __iomem *reg)
@@ -1299,7 +1307,6 @@ void isci_phy_init(struct isci_phy *iphy, struct isci_host *ihost, int index)
         sas_addr = cpu_to_be64(sci_sas_addr);
         memcpy(iphy->sas_addr, &sas_addr, sizeof(sas_addr));
 
-        iphy->isci_port = NULL;
         iphy->sas_phy.enabled = 0;
         iphy->sas_phy.id = index;
         iphy->sas_phy.sas_addr = &iphy->sas_addr[0];
@@ -1333,13 +1340,13 @@ int isci_phy_control(struct asd_sas_phy *sas_phy,
 {
         int ret = 0;
         struct isci_phy *iphy = sas_phy->lldd_phy;
-        struct isci_port *iport = iphy->isci_port;
+        struct asd_sas_port *port = sas_phy->port;
         struct isci_host *ihost = sas_phy->ha->lldd_ha;
         unsigned long flags;
 
         dev_dbg(&ihost->pdev->dev,
                 "%s: phy %p; func %d; buf %p; isci phy %p, port %p\n",
-                __func__, sas_phy, func, buf, iphy, iport);
+                __func__, sas_phy, func, buf, iphy, port);
 
         switch (func) {
         case PHY_FUNC_DISABLE:
@@ -1356,11 +1363,10 @@ int isci_phy_control(struct asd_sas_phy *sas_phy,
                 break;
 
         case PHY_FUNC_HARD_RESET:
-                if (!iport)
+                if (!port)
                         return -ENODEV;
 
-                /* Perform the port reset. */
-                ret = isci_port_perform_hard_reset(ihost, iport, iphy);
+                ret = isci_port_perform_hard_reset(ihost, port->lldd_port, iphy);
 
                 break;
         case PHY_FUNC_GET_EVENTS: {
diff --git a/drivers/scsi/isci/phy.h b/drivers/scsi/isci/phy.h
index 67699c8e321c..a5e1a9e577b0 100644
--- a/drivers/scsi/isci/phy.h
+++ b/drivers/scsi/isci/phy.h
@@ -103,7 +103,6 @@ struct isci_phy {
         struct scu_transport_layer_registers __iomem *transport_layer_registers;
         struct scu_link_layer_registers __iomem *link_layer_registers;
         struct asd_sas_phy sas_phy;
-        struct isci_port *isci_port;
         u8 sas_addr[SAS_ADDR_SIZE];
         union {
                 struct sas_identify_frame iaf;
diff --git a/drivers/scsi/isci/port.c b/drivers/scsi/isci/port.c
index 7c6ac58a5c4c..a28c9e6e2806 100644
--- a/drivers/scsi/isci/port.c
+++ b/drivers/scsi/isci/port.c
@@ -60,6 +60,21 @@
 #define SCIC_SDS_PORT_HARD_RESET_TIMEOUT  (1000)
 #define SCU_DUMMY_INDEX    (0xFFFF)
 
+static struct device *sciport_to_dev(struct isci_port *iport)
+{
+        int i = iport->physical_port_index;
+        struct isci_port *table;
+        struct isci_host *ihost;
+
+        if (i == SCIC_SDS_DUMMY_PORT)
+                i = SCI_MAX_PORTS+1;
+
+        table = iport - i;
+        ihost = container_of(table, typeof(*ihost), ports[0]);
+
+        return &ihost->pdev->dev;
+}
+
 static void isci_port_change_state(struct isci_port *iport, enum isci_status status)
 {
         unsigned long flags;
@@ -165,17 +180,13 @@ static void isci_port_link_up(struct isci_host *isci_host,
         struct sci_port_properties properties;
         unsigned long success = true;
 
-        BUG_ON(iphy->isci_port != NULL);
-
-        iphy->isci_port = iport;
-
         dev_dbg(&isci_host->pdev->dev,
                 "%s: isci_port = %p\n",
                 __func__, iport);
 
         spin_lock_irqsave(&iphy->sas_phy.frame_rcvd_lock, flags);
 
-        isci_port_change_state(iphy->isci_port, isci_starting);
+        isci_port_change_state(iport, isci_starting);
 
         sci_port_get_properties(iport, &properties);
 
@@ -269,8 +280,6 @@ static void isci_port_link_down(struct isci_host *isci_host,
         isci_host->sas_ha.notify_phy_event(&isci_phy->sas_phy,
                                            PHYE_LOSS_OF_SIGNAL);
 
-        isci_phy->isci_port = NULL;
-
         dev_dbg(&isci_host->pdev->dev,
                 "%s: isci_port = %p - Done\n", __func__, isci_port);
 }
@@ -288,7 +297,6 @@ static void isci_port_ready(struct isci_host *isci_host, struct isci_port *isci_
         dev_dbg(&isci_host->pdev->dev,
                 "%s: isci_port = %p\n", __func__, isci_port);
 
-        complete_all(&isci_port->start_complete);
         isci_port_change_state(isci_port, isci_ready);
         return;
 }
@@ -1645,7 +1653,6 @@ void isci_port_init(struct isci_port *iport, struct isci_host *ihost, int index)
         INIT_LIST_HEAD(&iport->remote_dev_list);
         INIT_LIST_HEAD(&iport->domain_dev_list);
         spin_lock_init(&iport->state_lock);
-        init_completion(&iport->start_complete);
         iport->isci_host = ihost;
         isci_port_change_state(iport, isci_freed);
 }
@@ -1726,24 +1733,55 @@ int isci_port_perform_hard_reset(struct isci_host *ihost, struct isci_port *ipor
         return ret;
 }
 
-/**
- * isci_port_deformed() - This function is called by libsas when a port becomes
- *    inactive.
- * @phy: This parameter specifies the libsas phy with the inactive port.
- *
- */
 void isci_port_deformed(struct asd_sas_phy *phy)
 {
-        pr_debug("%s: sas_phy = %p\n", __func__, phy);
+        struct isci_host *ihost = phy->ha->lldd_ha;
+        struct isci_port *iport = phy->port->lldd_port;
+        unsigned long flags;
+        int i;
+
+        /* we got a port notification on a port that was subsequently
+         * torn down and libsas is just now catching up
+         */
+        if (!iport)
+                return;
+
+        spin_lock_irqsave(&ihost->scic_lock, flags);
+        for (i = 0; i < SCI_MAX_PHYS; i++) {
+                if (iport->active_phy_mask & 1 << i)
+                        break;
+        }
+        spin_unlock_irqrestore(&ihost->scic_lock, flags);
+
+        if (i >= SCI_MAX_PHYS)
+                dev_dbg(&ihost->pdev->dev, "%s: port: %ld\n",
+                        __func__, (long) (iport - &ihost->ports[0]));
 }
 
-/**
- * isci_port_formed() - This function is called by libsas when a port becomes
- *    active.
- * @phy: This parameter specifies the libsas phy with the active port.
- *
- */
 void isci_port_formed(struct asd_sas_phy *phy)
 {
-        pr_debug("%s: sas_phy = %p, sas_port = %p\n", __func__, phy, phy->port);
+        struct isci_host *ihost = phy->ha->lldd_ha;
+        struct isci_phy *iphy = to_iphy(phy);
+        struct asd_sas_port *port = phy->port;
+        struct isci_port *iport;
+        unsigned long flags;
+        int i;
+
+        /* initial ports are formed as the driver is still initializing,
+         * wait for that process to complete
+         */
+        wait_for_start(ihost);
+
+        spin_lock_irqsave(&ihost->scic_lock, flags);
+        for (i = 0; i < SCI_MAX_PORTS; i++) {
+                iport = &ihost->ports[i];
+                if (iport->active_phy_mask & 1 << iphy->phy_index)
+                        break;
+        }
+        spin_unlock_irqrestore(&ihost->scic_lock, flags);
+
+        if (i >= SCI_MAX_PORTS)
+                iport = NULL;
+
+        port->lldd_port = iport;
 }
diff --git a/drivers/scsi/isci/port.h b/drivers/scsi/isci/port.h
index 08116090eb70..6b42e84b6955 100644
--- a/drivers/scsi/isci/port.h
+++ b/drivers/scsi/isci/port.h
@@ -97,11 +97,9 @@ enum isci_status {
 struct isci_port {
         enum isci_status status;
         struct isci_host *isci_host;
-        struct asd_sas_port sas_port;
         struct list_head remote_dev_list;
         spinlock_t state_lock;
         struct list_head domain_dev_list;
-        struct completion start_complete;
         struct completion hard_reset_complete;
         enum sci_status hard_reset_status;
         struct sci_base_state_machine sm;
diff --git a/drivers/scsi/isci/remote_device.c b/drivers/scsi/isci/remote_device.c
index dd74b6ceeb82..cff684fc1efc 100644
--- a/drivers/scsi/isci/remote_device.c
+++ b/drivers/scsi/isci/remote_device.c
@@ -1381,31 +1381,18 @@ void isci_remote_device_gone(struct domain_device *dev)
  *
  * status, zero indicates success.
  */
-int isci_remote_device_found(struct domain_device *domain_dev)
+int isci_remote_device_found(struct domain_device *dev)
 {
-        struct isci_host *isci_host = dev_to_ihost(domain_dev);
-        struct isci_port *isci_port;
-        struct isci_phy *isci_phy;
-        struct asd_sas_port *sas_port;
-        struct asd_sas_phy *sas_phy;
+        struct isci_host *isci_host = dev_to_ihost(dev);
+        struct isci_port *isci_port = dev->port->lldd_port;
         struct isci_remote_device *isci_device;
         enum sci_status status;
 
         dev_dbg(&isci_host->pdev->dev,
-                "%s: domain_device = %p\n", __func__, domain_dev);
+                "%s: domain_device = %p\n", __func__, dev);
 
-        wait_for_start(isci_host);
-
-        sas_port = domain_dev->port;
-        sas_phy = list_first_entry(&sas_port->phy_list, struct asd_sas_phy,
-                                   port_phy_el);
-        isci_phy = to_iphy(sas_phy);
-        isci_port = isci_phy->isci_port;
-
-        /* we are being called for a device on this port,
-         * so it has to come up eventually
-         */
-        wait_for_completion(&isci_port->start_complete);
+        if (!isci_port)
+                return -ENODEV;
 
         if ((isci_stopping == isci_port_get_state(isci_port)) ||
             (isci_stopped == isci_port_get_state(isci_port)))
@@ -1419,7 +1406,7 @@ int isci_remote_device_found(struct domain_device *domain_dev)
         INIT_LIST_HEAD(&isci_device->node);
 
         spin_lock_irq(&isci_host->scic_lock);
-        isci_device->domain_dev = domain_dev;
+        isci_device->domain_dev = dev;
         isci_device->isci_port = isci_port;
         list_add_tail(&isci_device->node, &isci_port->remote_dev_list);
 
@@ -1432,7 +1419,7 @@ int isci_remote_device_found(struct domain_device *domain_dev)
 
         if (status == SCI_SUCCESS) {
                 /* device came up, advertise it to the world */
-                domain_dev->lldd_dev = isci_device;
+                dev->lldd_dev = isci_device;
         } else
                 isci_put_device(isci_device);
         spin_unlock_irq(&isci_host->scic_lock);