megaraid_sas : Support for Avago's Single server High Availability product

This patch will add support for Single Server High Availability(SSHA) cluster
support.  Here is the short decsription of changes done to add support for
SSHA-

1) Host will send system's Unique ID based on DMI_PRODUCT_UUID to firmware.
2) Toggle the devhandle in LDIO path for Remote LDs.

Signed-off-by: Kashyap Desai <kashyap.desai@avagotech.com>
Signed-off-by: Sumit Saxena <sumit.saxena@avagotech.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: James Bottomley <JBottomley@Odin.com>

drivers/scsi/megaraid/megaraid_sas.h

@@ -1271,8 +1271,10 @@ struct megasas_init_frame {
 	u32 queue_info_new_phys_addr_hi;	/*1Ch */
 	u32 queue_info_old_phys_addr_lo;	/*20h */
 	u32 queue_info_old_phys_addr_hi;	/*24h */
-
-	u32 reserved_4[6];	/*28h */
+	u32 reserved_4[2];	/*28h */
+	u32 system_info_lo;      /*30h */
+	u32 system_info_hi;      /*34h */
+	u32 reserved_5[2];	/*38h */
 
 } __attribute__ ((packed));
 
@@ -1649,12 +1651,22 @@ struct megasas_irq_context {
 	u32 MSIxIndex;
 };
 
+struct MR_DRV_SYSTEM_INFO {
+	u8	infoVersion;
+	u8	systemIdLength;
+	u16	reserved0;
+	u8	systemId[64];
+	u8	reserved[1980];
+};
+
 struct megasas_instance {
 
 	u32 *producer;
 	dma_addr_t producer_h;
 	u32 *consumer;
 	dma_addr_t consumer_h;
+	struct MR_DRV_SYSTEM_INFO *system_info_buf;
+	dma_addr_t system_info_h;
 	struct MR_LD_VF_AFFILIATION *vf_affiliation;
 	dma_addr_t vf_affiliation_h;
 	struct MR_LD_VF_AFFILIATION_111 *vf_affiliation_111;
@@ -1769,6 +1781,7 @@ struct megasas_instance {
 	u16 throttlequeuedepth;
 	u8 mask_interrupts;
 	u8 is_imr;
+	bool dev_handle;
 };
 struct MR_LD_VF_MAP {
 	u32 size;