[SCSI] mpt fusion: Firmware event implementation using seperate WorkQueue

Now Firmware events are handled by firmware event queue.
Previously it was handled in interrupt context/WorkQueue of Linux.
Firmware Event handling is restructured and optimized.
Signed-off-by: Kashyap Desai <kadesai@lsi.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

drivers/message/fusion/mptbase.c

@@ -1931,6 +1931,11 @@ mpt_attach(struct pci_dev *pdev, const struct pci_device_id *id)
 	 */
 	mpt_detect_bound_ports(ioc, pdev);
 
+	INIT_LIST_HEAD(&ioc->fw_event_list);
+	spin_lock_init(&ioc->fw_event_lock);
+	snprintf(ioc->fw_event_q_name, 20, "mpt/%d", ioc->id);
+	ioc->fw_event_q = create_singlethread_workqueue(ioc->fw_event_q_name);
+
 	if ((r = mpt_do_ioc_recovery(ioc, MPT_HOSTEVENT_IOC_BRINGUP,
 	    CAN_SLEEP)) != 0){
 		printk(MYIOC_s_ERR_FMT "didn't initialize properly! (%d)\n",
@@ -2010,6 +2015,11 @@ mpt_detach(struct pci_dev *pdev)
 	cancel_delayed_work(&ioc->fault_reset_work);
 	destroy_workqueue(wq);
 
+	spin_lock_irqsave(&ioc->fw_event_lock, flags);
+	wq = ioc->fw_event_q;
+	ioc->fw_event_q = NULL;
+	spin_unlock_irqrestore(&ioc->fw_event_lock, flags);
+	destroy_workqueue(wq);
 
 	sprintf(pname, MPT_PROCFS_MPTBASEDIR "/%s/summary", ioc->name);
 	remove_proc_entry(pname, NULL);

drivers/message/fusion/mptbase.h

@@ -694,9 +694,18 @@ typedef struct _MPT_ADAPTER
 	struct net_device	*netdev;
 	struct list_head	 sas_topology;
 	struct mutex		 sas_topology_mutex;
+
+	struct workqueue_struct	*fw_event_q;
+	struct list_head	 fw_event_list;
+	spinlock_t		 fw_event_lock;
+	u8			 fw_events_off; /* if '1', then ignore events */
+	char 			 fw_event_q_name[20];
+
 	struct mutex		 sas_discovery_mutex;
 	u8			 sas_discovery_runtime;
 	u8			 sas_discovery_ignore_events;
+	struct list_head	 sas_device_info_list;
+	struct mutex		 sas_device_info_mutex;
 	u8			 sas_discovery_quiesce_io;
 	int			 sas_index; /* index refrencing */
 	MPT_MGMT		 sas_mgmt;

drivers/message/fusion/mptsas.h

@@ -61,12 +61,30 @@ enum mptsas_hotplug_action {
 	MPTSAS_DEL_DEVICE,
 	MPTSAS_ADD_RAID,
 	MPTSAS_DEL_RAID,
+	MPTSAS_ADD_PHYSDISK,
+	MPTSAS_ADD_PHYSDISK_REPROBE,
+	MPTSAS_DEL_PHYSDISK,
+	MPTSAS_DEL_PHYSDISK_REPROBE,
 	MPTSAS_ADD_INACTIVE_VOLUME,
 	MPTSAS_IGNORE_EVENT,
 };
 
+struct mptsas_mapping{
+	u8			id;
+	u8			channel;
+};
+
+struct mptsas_device_info {
+	struct list_head 	list;
+	struct mptsas_mapping	os;	/* operating system mapping*/
+	struct mptsas_mapping	fw;	/* firmware mapping */
+	u64			sas_address;
+	u32			device_info; /* specific bits for devices */
+	u16			slot;		/* enclosure slot id */
+	u64			enclosure_logical_id; /*enclosure address */
+};
+
 struct mptsas_hotplug_event {
-	struct work_struct	work;
 	MPT_ADAPTER		*ioc;
 	enum mptsas_hotplug_action event_type;
 	u64			sas_address;
@@ -74,11 +92,18 @@ struct mptsas_hotplug_event {
 	u8			id;
 	u32			device_info;
 	u16			handle;
-	u16			parent_handle;
 	u8			phy_id;
-	u8			phys_disk_num_valid;	/* hrc (hidden raid component) */
 	u8			phys_disk_num;		/* hrc - unique index*/
-	u8			hidden_raid_component;	/* hrc - don't expose*/
+	struct scsi_device	*sdev;
+};
+
+struct fw_event_work {
+	struct list_head 	list;
+	struct delayed_work	 work;
+	MPT_ADAPTER	*ioc;
+	u32			event;
+	u8			retries;
+	u8			event_data[1];
 };
 
 struct mptsas_discovery_event {