[SCSI] mptfusion: Added new less expensive RESET (Message Unit Reset)

Message Unit Reset - instructs the IOC to reset the Reply Post and
Free FIFO's. All the Message Frames on Reply Free FIFO are
discarded. All posted buffers are freed, and event notification is
turned off.  IOC doesnt reply to any outstanding request. This will
transfer IOC to READY state.  Message unit ready is less expensive
operations than Hard Reset.  soft reset will not force Firmware to
reload again, it only do clean up of Message units.

mpt_Soft_Hard_ResetHandler will first try for Soft Reset,if
it fails then go for big hammer reset which is Hard Reset.

Signed-off-by: Kashyap Desai <kashyap.desai@lsi.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

1 files changed, 168 insertions, 2 deletions

diff --git a/drivers/message/fusion/mptbase.c b/drivers/message/fusion/mptbase.c
index 5382b5a44aff..a4f023bd5d2b 100644
--- a/drivers/message/fusion/mptbase.c
+++ b/drivers/message/fusion/mptbase.c
@@ -5064,7 +5064,7 @@ mptbase_sas_persist_operation(MPT_ADAPTER *ioc, u8 persist_opcode)
                 if (!timeleft) {
                         printk(KERN_DEBUG "%s: Issuing Reset from %s!!\n",
                             ioc->name, __func__);
-                        mpt_HardResetHandler(ioc, CAN_SLEEP);
+                        mpt_Soft_Hard_ResetHandler(ioc, CAN_SLEEP);
                         mpt_free_msg_frame(ioc, mf);
                 }
                 goto out;
@@ -6456,7 +6456,7 @@ out:
                 issue_hard_reset = 0;
                 printk(MYIOC_s_WARN_FMT "Issuing Reset from %s!!\n",
                     ioc->name, __func__);
-                mpt_HardResetHandler(ioc, CAN_SLEEP);
+                mpt_Soft_Hard_ResetHandler(ioc, CAN_SLEEP);
                 mpt_free_msg_frame(ioc, mf);
                 /* attempt one retry for a timed out command */
                 if (!retry_count) {
@@ -6904,6 +6904,172 @@ mpt_halt_firmware(MPT_ADAPTER *ioc)
 }
 EXPORT_SYMBOL(mpt_halt_firmware);
 
+/**
+ *      mpt_SoftResetHandler - Issues a less expensive reset
+ *      @ioc: Pointer to MPT_ADAPTER structure
+ *      @sleepFlag: Indicates if sleep or schedule must be called.
+
+ *
+ *      Returns 0 for SUCCESS or -1 if FAILED.
+ *
+ *      Message Unit Reset - instructs the IOC to reset the Reply Post and
+ *      Free FIFO's. All the Message Frames on Reply Free FIFO are discarded.
+ *      All posted buffers are freed, and event notification is turned off.
+ *      IOC doesnt reply to any outstanding request. This will transfer IOC
+ *      to READY state.
+ **/
+int
+mpt_SoftResetHandler(MPT_ADAPTER *ioc, int sleepFlag)
+{
+        int              rc;
+        int              ii;
+        u8               cb_idx;
+        unsigned long    flags;
+        u32              ioc_state;
+        unsigned long    time_count;
+
+        dtmprintk(ioc, printk(MYIOC_s_DEBUG_FMT "SoftResetHandler Entered!\n",
+                ioc->name));
+
+        ioc_state = mpt_GetIocState(ioc, 0) & MPI_IOC_STATE_MASK;
+
+        if (mpt_fwfault_debug)
+                mpt_halt_firmware(ioc);
+
+        if (ioc_state == MPI_IOC_STATE_FAULT ||
+            ioc_state == MPI_IOC_STATE_RESET) {
+                dtmprintk(ioc, printk(MYIOC_s_DEBUG_FMT
+                    "skipping, either in FAULT or RESET state!\n", ioc->name));
+                return -1;
+        }
+
+        if (ioc->bus_type == FC) {
+                dtmprintk(ioc, printk(MYIOC_s_DEBUG_FMT
+                    "skipping, because the bus type is FC!\n", ioc->name));
+                return -1;
+        }
+
+        spin_lock_irqsave(&ioc->taskmgmt_lock, flags);
+        if (ioc->ioc_reset_in_progress) {
+                spin_unlock_irqrestore(&ioc->taskmgmt_lock, flags);
+                return -1;
+        }
+        ioc->ioc_reset_in_progress = 1;
+        spin_unlock_irqrestore(&ioc->taskmgmt_lock, flags);
+
+        rc = -1;
+
+        for (cb_idx = MPT_MAX_PROTOCOL_DRIVERS-1; cb_idx; cb_idx--) {
+                if (MptResetHandlers[cb_idx])
+                        mpt_signal_reset(cb_idx, ioc, MPT_IOC_SETUP_RESET);
+        }
+
+        spin_lock_irqsave(&ioc->taskmgmt_lock, flags);
+        if (ioc->taskmgmt_in_progress) {
+                spin_unlock_irqrestore(&ioc->taskmgmt_lock, flags);
+                return -1;
+        }
+        spin_unlock_irqrestore(&ioc->taskmgmt_lock, flags);
+        /* Disable reply interrupts (also blocks FreeQ) */
+        CHIPREG_WRITE32(&ioc->chip->IntMask, 0xFFFFFFFF);
+        ioc->active = 0;
+        time_count = jiffies;
+
+        rc = SendIocReset(ioc, MPI_FUNCTION_IOC_MESSAGE_UNIT_RESET, sleepFlag);
+
+        for (cb_idx = MPT_MAX_PROTOCOL_DRIVERS-1; cb_idx; cb_idx--) {
+                if (MptResetHandlers[cb_idx])
+                        mpt_signal_reset(cb_idx, ioc, MPT_IOC_PRE_RESET);
+        }
+
+        if (rc)
+                goto out;
+
+        ioc_state = mpt_GetIocState(ioc, 0) & MPI_IOC_STATE_MASK;
+        if (ioc_state != MPI_IOC_STATE_READY)
+                goto out;
+
+        for (ii = 0; ii < 5; ii++) {
+                /* Get IOC facts! Allow 5 retries */
+                rc = GetIocFacts(ioc, sleepFlag,
+                        MPT_HOSTEVENT_IOC_RECOVER);
+                if (rc == 0)
+                        break;
+                if (sleepFlag == CAN_SLEEP)
+                        msleep(100);
+                else
+                        mdelay(100);
+        }
+        if (ii == 5)
+                goto out;
+
+        rc = PrimeIocFifos(ioc);
+        if (rc != 0)
+                goto out;
+
+        rc = SendIocInit(ioc, sleepFlag);
+        if (rc != 0)
+                goto out;
+
+        rc = SendEventNotification(ioc, 1, sleepFlag);
+        if (rc != 0)
+                goto out;
+
+        if (ioc->hard_resets < -1)
+                ioc->hard_resets++;
+
+        /*
+         * At this point, we know soft reset succeeded.
+         */
+
+        ioc->active = 1;
+        CHIPREG_WRITE32(&ioc->chip->IntMask, MPI_HIM_DIM);
+
+ out:
+        spin_lock_irqsave(&ioc->taskmgmt_lock, flags);
+        ioc->ioc_reset_in_progress = 0;
+        ioc->taskmgmt_quiesce_io = 0;
+        ioc->taskmgmt_in_progress = 0;
+        spin_unlock_irqrestore(&ioc->taskmgmt_lock, flags);
+
+        if (ioc->active) {      /* otherwise, hard reset coming */
+                for (cb_idx = MPT_MAX_PROTOCOL_DRIVERS-1; cb_idx; cb_idx--) {
+                        if (MptResetHandlers[cb_idx])
+                                mpt_signal_reset(cb_idx, ioc,
+                                        MPT_IOC_POST_RESET);
+                }
+        }
+
+        dtmprintk(ioc, printk(MYIOC_s_DEBUG_FMT
+                "SoftResetHandler: completed (%d seconds): %s\n",
+                ioc->name, jiffies_to_msecs(jiffies - time_count)/1000,
+                ((rc == 0) ? "SUCCESS" : "FAILED")));
+
+        return rc;
+}
+
+/**
+ *      mpt_Soft_Hard_ResetHandler - Try less expensive reset
+ *      @ioc: Pointer to MPT_ADAPTER structure
+ *      @sleepFlag: Indicates if sleep or schedule must be called.
+
+ *
+ *      Returns 0 for SUCCESS or -1 if FAILED.
+ *      Try for softreset first, only if it fails go for expensive
+ *      HardReset.
+ **/
+int
+mpt_Soft_Hard_ResetHandler(MPT_ADAPTER *ioc, int sleepFlag) {
+        int ret = -1;
+
+        ret = mpt_SoftResetHandler(ioc, sleepFlag);
+        if (ret == 0)
+                return ret;
+        ret = mpt_HardResetHandler(ioc, sleepFlag);
+        return ret;
+}
+EXPORT_SYMBOL(mpt_Soft_Hard_ResetHandler);
+
 /*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/
 /*
  *      Reset Handling