scsi: smartpqi: Use host-wide tag space

Correct SCSI midlayer sending more requests than exposed host queue depth
causing firmware ASSERT and lockup issues by enabling host-wide tags.

Note: This also results in better performance.

Link: https://lore.kernel.org/r/161549369787.25025.8975999483518581619.stgit@brunhildaSuggested-by: Ming Lei <ming.lei@redhat.com>
Suggested-by: John Garry <john.garry@huawei.com>
Reviewed-by: Scott Benesh <scott.benesh@microchip.com>
Reviewed-by: Scott Teel <scott.teel@microchip.com>
Reviewed-by: Mike McGowen <mike.mcgowen@microchip.com>
Reviewed-by: Kevin Barnett <kevin.barnett@microchip.com>
Signed-off-by: Don Brace <don.brace@microchip.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/smartpqi/smartpqi_init.c

@@ -6599,6 +6599,7 @@ static int pqi_register_scsi(struct pqi_ctrl_info *ctrl_info)
 	shost->irq = pci_irq_vector(ctrl_info->pci_dev, 0);
 	shost->unique_id = shost->irq;
 	shost->nr_hw_queues = ctrl_info->num_queue_groups;
+	shost->host_tagset = 1;
 	shost->hostdata[0] = (unsigned long)ctrl_info;
 
 	rc = scsi_add_host(shost, &ctrl_info->pci_dev->dev);