[SCSI] mptfusion : dv performance fix

Syncronization for Domain Validation workqueue and the initiation of the
alternate controller.  Its possible that dv could be terminated if the
workqueue on the 1st channel doesn complete in time before the 2nd channel
begins initialization.

Signed-off-by: Eric Moore <Eric.Moore@lsil.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

3 files changed, 75 insertions, 2 deletions

diff --git a/drivers/message/fusion/mptbase.c b/drivers/message/fusion/mptbase.c
index 74022316fc634..cabf35373cfd0 100644
--- a/drivers/message/fusion/mptbase.c
+++ b/drivers/message/fusion/mptbase.c
@@ -1118,6 +1118,65 @@ mpt_verify_adapter(int iocid, MPT_ADAPTER **iocpp)
 	return -1;
 }
 
+int
+mpt_alt_ioc_wait(MPT_ADAPTER *ioc)
+{
+	int loop_count = 30 * 4;  /* Wait 30 seconds */
+	int status = -1; /* -1 means failed to get board READY */
+
+	do {
+		spin_lock(&ioc->initializing_hba_lock);
+		if (ioc->initializing_hba_lock_flag == 0) {
+			ioc->initializing_hba_lock_flag=1;
+			spin_unlock(&ioc->initializing_hba_lock);
+			status = 0;
+			break;
+		}
+		spin_unlock(&ioc->initializing_hba_lock);
+		set_current_state(TASK_INTERRUPTIBLE);
+		schedule_timeout(HZ/4);
+	} while (--loop_count);
+
+	return status;
+}
+
+/*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/
+/*
+ *	mpt_bringup_adapter - This is a wrapper function for mpt_do_ioc_recovery
+ *	@ioc: Pointer to MPT adapter structure
+ *	@sleepFlag: Use schedule if CAN_SLEEP else use udelay.
+ *
+ *	This routine performs all the steps necessary to bring the IOC
+ *	to a OPERATIONAL state.
+ *
+ *      Special Note: This function was added with spin lock's so as to allow
+ *      the dv(domain validation) work thread to succeed on the other channel
+ *      that maybe occuring at the same time when this function is called.
+ *      Without this lock, the dv would fail when message frames were
+ *      requested during hba bringup on the alternate ioc.
+ */
+static int
+mpt_bringup_adapter(MPT_ADAPTER *ioc, int sleepFlag)
+{
+	int r;
+
+	if(ioc->alt_ioc) {
+		if((r=mpt_alt_ioc_wait(ioc->alt_ioc)!=0))
+			return r;
+	}
+
+	r = mpt_do_ioc_recovery(ioc, MPT_HOSTEVENT_IOC_BRINGUP,
+	    CAN_SLEEP);
+
+	if(ioc->alt_ioc) {
+		spin_lock(&ioc->alt_ioc->initializing_hba_lock);
+		ioc->alt_ioc->initializing_hba_lock_flag=0;
+		spin_unlock(&ioc->alt_ioc->initializing_hba_lock);
+	}
+
+return r;
+}
+
 /*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/
 /*
  *	mpt_attach - Install a PCI intelligent MPT adapter.
@@ -1186,6 +1245,7 @@ mpt_attach(struct pci_dev *pdev, const struct pci_device_id *id)
 	ioc->pcidev = pdev;
 	ioc->diagPending = 0;
 	spin_lock_init(&ioc->diagLock);
+	spin_lock_init(&ioc->initializing_hba_lock);
 
 	/* Initialize the event logging.
 	 */
@@ -1408,8 +1468,7 @@ mpt_attach(struct pci_dev *pdev, const struct pci_device_id *id)
 	 */
 	mpt_detect_bound_ports(ioc, pdev);
 
-	if ((r = mpt_do_ioc_recovery(ioc,
-	  MPT_HOSTEVENT_IOC_BRINGUP, CAN_SLEEP)) != 0) {
+	if ((r = mpt_bringup_adapter(ioc, CAN_SLEEP)) != 0){
 		printk(KERN_WARNING MYNAM
 		  ": WARNING - %s did not initialize properly! (%d)\n",
 		  ioc->name, r);
@@ -6296,6 +6355,7 @@ EXPORT_SYMBOL(mpt_read_ioc_pg_3);
 EXPORT_SYMBOL(mpt_alloc_fw_memory);
 EXPORT_SYMBOL(mpt_free_fw_memory);
 EXPORT_SYMBOL(mptbase_sas_persist_operation);
+EXPORT_SYMBOL(mpt_alt_ioc_wait);
 
 
 /*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/
diff --git a/drivers/message/fusion/mptbase.h b/drivers/message/fusion/mptbase.h
index 8ad277a9afa16..a564ae36a2c2e 100644
--- a/drivers/message/fusion/mptbase.h
+++ b/drivers/message/fusion/mptbase.h
@@ -611,6 +611,8 @@ typedef struct _MPT_ADAPTER
 	int			 DoneCtx;
 	int			 TaskCtx;
 	int			 InternalCtx;
+	spinlock_t		 initializing_hba_lock;
+	int 	 		 initializing_hba_lock_flag;
 	struct list_head	 list;
 	struct net_device	*netdev;
 	struct list_head	 sas_topology;
@@ -1001,6 +1003,7 @@ extern void	 mpt_free_fw_memory(MPT_ADAPTER *ioc);
 extern int	 mpt_findImVolumes(MPT_ADAPTER *ioc);
 extern int	 mpt_read_ioc_pg_3(MPT_ADAPTER *ioc);
 extern int	 mptbase_sas_persist_operation(MPT_ADAPTER *ioc, u8 persist_opcode);
+extern int	 mpt_alt_ioc_wait(MPT_ADAPTER *ioc);
 
 /*
  *  Public data decl's...
diff --git a/drivers/message/fusion/mptscsih.c b/drivers/message/fusion/mptscsih.c
index 4330ed0cedaaa..b7b9846ff3fd9 100644
--- a/drivers/message/fusion/mptscsih.c
+++ b/drivers/message/fusion/mptscsih.c
@@ -4162,6 +4162,12 @@ mptscsih_domainValidation(void *arg)
 						}
 					}
 
+					if(mpt_alt_ioc_wait(hd->ioc)!=0) {
+						ddvprintk((MYIOC_s_WARN_FMT "alt_ioc busy!\n",
+						    hd->ioc->name));
+						continue;
+					}
+
 					if (mptscsih_doDv(hd, 0, id) == 1) {
 						/* Untagged device was busy, try again
 						 */
@@ -4173,6 +4179,10 @@ mptscsih_domainValidation(void *arg)
 						hd->ioc->spi_data.dvStatus[id] &= ~(MPT_SCSICFG_DV_NOT_DONE | MPT_SCSICFG_DV_PENDING);
 					}
 
+					spin_lock(&hd->ioc->initializing_hba_lock);
+					hd->ioc->initializing_hba_lock_flag=0;
+					spin_unlock(&hd->ioc->initializing_hba_lock);
+
 					if (isPhysDisk) {
 						for (ii=0; ii < MPT_MAX_SCSI_DEVICES; ii++) {
 							if (hd->ioc->raid_data.isRaid & (1 << ii)) {