3 files changed, 151 insertions, 1 deletions

diff --git a/drivers/scsi/libata-core.c b/drivers/scsi/libata-core.c
index dc35cccd2898..83d93fc0751b 100644
--- a/drivers/scsi/libata-core.c
+++ b/drivers/scsi/libata-core.c
@@ -1528,7 +1528,7 @@ err_out_nosup:
  *      Zero on success, negative errno otherwise.
  */
 
-static int ata_bus_probe(struct ata_port *ap)
+int ata_bus_probe(struct ata_port *ap)
 {
         unsigned int classes[ATA_MAX_DEVICES];
         int tries[ATA_MAX_DEVICES];
diff --git a/drivers/scsi/libata-scsi.c b/drivers/scsi/libata-scsi.c
index 1638e57028cb..37ec02661433 100644
--- a/drivers/scsi/libata-scsi.c
+++ b/drivers/scsi/libata-scsi.c
@@ -3158,3 +3158,152 @@ void ata_scsi_dev_rescan(void *data)
                         scsi_rescan_device(&(dev->sdev->sdev_gendev));
         }
 }
+
+/**
+ *      ata_sas_port_alloc - Allocate port for a SAS attached SATA device
+ *      @pdev: PCI device that the scsi device is attached to
+ *      @port_info: Information from low-level host driver
+ *      @host: SCSI host that the scsi device is attached to
+ *
+ *      LOCKING:
+ *      PCI/etc. bus probe sem.
+ *
+ *      RETURNS:
+ *      ata_port pointer on success / NULL on failure.
+ */
+
+struct ata_port *ata_sas_port_alloc(struct ata_host_set *host_set,
+                                    struct ata_port_info *port_info,
+                                    struct Scsi_Host *host)
+{
+        struct ata_port *ap = kzalloc(sizeof(*ap), GFP_KERNEL);
+        struct ata_probe_ent *ent;
+
+        if (!ap)
+                return NULL;
+
+        ent = ata_probe_ent_alloc(host_set->dev, port_info);
+        if (!ent) {
+                kfree(ap);
+                return NULL;
+        }
+
+        ata_port_init(ap, host_set, ent, 0);
+        ap->lock = host->host_lock;
+        kfree(ent);
+        return ap;
+}
+EXPORT_SYMBOL_GPL(ata_sas_port_alloc);
+
+/**
+ *      ata_sas_port_start - Set port up for dma.
+ *      @ap: Port to initialize
+ *
+ *      Called just after data structures for each port are
+ *      initialized.  Allocates DMA pad.
+ *
+ *      May be used as the port_start() entry in ata_port_operations.
+ *
+ *      LOCKING:
+ *      Inherited from caller.
+ */
+int ata_sas_port_start(struct ata_port *ap)
+{
+        return ata_pad_alloc(ap, ap->dev);
+}
+EXPORT_SYMBOL_GPL(ata_sas_port_start);
+
+/**
+ *      ata_port_stop - Undo ata_sas_port_start()
+ *      @ap: Port to shut down
+ *
+ *      Frees the DMA pad.
+ *
+ *      May be used as the port_stop() entry in ata_port_operations.
+ *
+ *      LOCKING:
+ *      Inherited from caller.
+ */
+
+void ata_sas_port_stop(struct ata_port *ap)
+{
+        ata_pad_free(ap, ap->dev);
+}
+EXPORT_SYMBOL_GPL(ata_sas_port_stop);
+
+/**
+ *      ata_sas_port_init - Initialize a SATA device
+ *      @ap: SATA port to initialize
+ *
+ *      LOCKING:
+ *      PCI/etc. bus probe sem.
+ *
+ *      RETURNS:
+ *      Zero on success, non-zero on error.
+ */
+
+int ata_sas_port_init(struct ata_port *ap)
+{
+        int rc = ap->ops->port_start(ap);
+
+        if (!rc)
+                rc = ata_bus_probe(ap);
+
+        return rc;
+}
+EXPORT_SYMBOL_GPL(ata_sas_port_init);
+
+/**
+ *      ata_sas_port_destroy - Destroy a SATA port allocated by ata_sas_port_alloc
+ *      @ap: SATA port to destroy
+ *
+ */
+
+void ata_sas_port_destroy(struct ata_port *ap)
+{
+        ap->ops->port_stop(ap);
+        kfree(ap);
+}
+EXPORT_SYMBOL_GPL(ata_sas_port_destroy);
+
+/**
+ *      ata_sas_slave_configure - Default slave_config routine for libata devices
+ *      @sdev: SCSI device to configure
+ *      @ap: ATA port to which SCSI device is attached
+ *
+ *      RETURNS:
+ *      Zero.
+ */
+
+int ata_sas_slave_configure(struct scsi_device *sdev, struct ata_port *ap)
+{
+        ata_scsi_sdev_config(sdev);
+        ata_scsi_dev_config(sdev, ap->device);
+        return 0;
+}
+EXPORT_SYMBOL_GPL(ata_sas_slave_configure);
+
+/**
+ *      ata_sas_queuecmd - Issue SCSI cdb to libata-managed device
+ *      @cmd: SCSI command to be sent
+ *      @done: Completion function, called when command is complete
+ *      @ap:    ATA port to which the command is being sent
+ *
+ *      RETURNS:
+ *      Zero.
+ */
+
+int ata_sas_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *),
+                     struct ata_port *ap)
+{
+        ata_scsi_dump_cdb(ap, cmd);
+
+        if (likely(ata_scsi_dev_enabled(ap->device)))
+                __ata_scsi_queuecmd(cmd, done, ap->device);
+        else {
+                cmd->result = (DID_BAD_TARGET << 16);
+                done(cmd);
+        }
+        return 0;
+}
+EXPORT_SYMBOL_GPL(ata_sas_queuecmd);
diff --git a/drivers/scsi/libata.h b/drivers/scsi/libata.h
index 0b7a37c2785d..d4a4f82360ec 100644
--- a/drivers/scsi/libata.h
+++ b/drivers/scsi/libata.h
@@ -111,6 +111,7 @@ extern void ata_scsi_rbuf_fill(struct ata_scsi_args *args,
                                            u8 *rbuf, unsigned int buflen));
 extern void ata_schedule_scsi_eh(struct Scsi_Host *shost);
 extern void ata_scsi_dev_rescan(void *data);
+extern int ata_bus_probe(struct ata_port *ap);
 
 /* libata-eh.c */
 extern enum scsi_eh_timer_return ata_scsi_timed_out(struct scsi_cmnd *cmd);