[SCSI] mpt2sas: LUN Reset Support

Adding new eh_target_reset_handler for target reset. Change the
eh_device_reset_handler so its sending
MPI2_SCSITASKMGMT_TASKTYPE_LOGICAL_UNIT_RESET, instead of
MPI2_SCSITASKMGMT_TASKTYPE_TARGET_RESET.  Add new function
_scsih_scsi_lookup_find_by_lun as a sanity check to insure I_T_L commands are
completed upon completing lun reset.

Signed-off-by: Eric Moore <eric.moore@lsi.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

1 files changed, 109 insertions, 2 deletions

diff --git a/drivers/scsi/mpt2sas/mpt2sas_scsih.c b/drivers/scsi/mpt2sas/mpt2sas_scsih.c
index 5394f6196416..f45837630b24 100644
--- a/drivers/scsi/mpt2sas/mpt2sas_scsih.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_scsih.c
@@ -884,6 +884,41 @@ _scsih_scsi_lookup_find_by_target(struct MPT2SAS_ADAPTER *ioc, int id,
 }
 
 /**
+ * _scsih_scsi_lookup_find_by_lun - search for matching channel:id:lun
+ * @ioc: per adapter object
+ * @id: target id
+ * @lun: lun number
+ * @channel: channel
+ * Context: This function will acquire ioc->scsi_lookup_lock.
+ *
+ * This will search for a matching channel:id:lun in the scsi_lookup array,
+ * returning 1 if found.
+ */
+static u8
+_scsih_scsi_lookup_find_by_lun(struct MPT2SAS_ADAPTER *ioc, int id,
+    unsigned int lun, int channel)
+{
+        u8 found;
+        unsigned long   flags;
+        int i;
+
+        spin_lock_irqsave(&ioc->scsi_lookup_lock, flags);
+        found = 0;
+        for (i = 0 ; i < ioc->request_depth; i++) {
+                if (ioc->scsi_lookup[i].scmd &&
+                    (ioc->scsi_lookup[i].scmd->device->id == id &&
+                    ioc->scsi_lookup[i].scmd->device->channel == channel &&
+                    ioc->scsi_lookup[i].scmd->device->lun == lun)) {
+                        found = 1;
+                        goto out;
+                }
+        }
+ out:
+        spin_unlock_irqrestore(&ioc->scsi_lookup_lock, flags);
+        return found;
+}
+
+/**
  * _scsih_get_chain_buffer_dma - obtain block of chains (dma address)
  * @ioc: per adapter object
  * @smid: system request message index
@@ -1889,7 +1924,6 @@ scsih_abort(struct scsi_cmnd *scmd)
         return r;
 }
 
-
 /**
  * scsih_dev_reset - eh threads main device reset routine
  * @sdev: scsi device struct
@@ -1906,7 +1940,7 @@ scsih_dev_reset(struct scsi_cmnd *scmd)
         u16     handle;
         int r;
 
-        printk(MPT2SAS_INFO_FMT "attempting target reset! scmd(%p)\n",
+        printk(MPT2SAS_INFO_FMT "attempting device reset! scmd(%p)\n",
             ioc->name, scmd);
         scsi_print_command(scmd);
 
@@ -1941,6 +1975,78 @@ scsih_dev_reset(struct scsi_cmnd *scmd)
 
         mutex_lock(&ioc->tm_cmds.mutex);
         mpt2sas_scsih_issue_tm(ioc, handle, 0,
+            MPI2_SCSITASKMGMT_TASKTYPE_LOGICAL_UNIT_RESET, scmd->device->lun,
+            30);
+
+        /*
+         *  sanity check see whether all commands to this device been
+         *  completed
+         */
+        if (_scsih_scsi_lookup_find_by_lun(ioc, scmd->device->id,
+            scmd->device->lun, scmd->device->channel))
+                r = FAILED;
+        else
+                r = SUCCESS;
+        ioc->tm_cmds.status = MPT2_CMD_NOT_USED;
+        mutex_unlock(&ioc->tm_cmds.mutex);
+
+ out:
+        printk(MPT2SAS_INFO_FMT "device reset: %s scmd(%p)\n",
+            ioc->name, ((r == SUCCESS) ? "SUCCESS" : "FAILED"), scmd);
+        return r;
+}
+
+/**
+ * scsih_target_reset - eh threads main target reset routine
+ * @sdev: scsi device struct
+ *
+ * Returns SUCCESS if command aborted else FAILED
+ */
+static int
+scsih_target_reset(struct scsi_cmnd *scmd)
+{
+        struct MPT2SAS_ADAPTER *ioc = shost_priv(scmd->device->host);
+        struct MPT2SAS_DEVICE *sas_device_priv_data;
+        struct _sas_device *sas_device;
+        unsigned long flags;
+        u16     handle;
+        int r;
+
+        printk(MPT2SAS_INFO_FMT "attempting target reset! scmd(%p)\n",
+            ioc->name, scmd);
+        scsi_print_command(scmd);
+
+        sas_device_priv_data = scmd->device->hostdata;
+        if (!sas_device_priv_data || !sas_device_priv_data->sas_target) {
+                printk(MPT2SAS_INFO_FMT "target been deleted! scmd(%p)\n",
+                    ioc->name, scmd);
+                scmd->result = DID_NO_CONNECT << 16;
+                scmd->scsi_done(scmd);
+                r = SUCCESS;
+                goto out;
+        }
+
+        /* for hidden raid components obtain the volume_handle */
+        handle = 0;
+        if (sas_device_priv_data->sas_target->flags &
+            MPT_TARGET_FLAGS_RAID_COMPONENT) {
+                spin_lock_irqsave(&ioc->sas_device_lock, flags);
+                sas_device = _scsih_sas_device_find_by_handle(ioc,
+                   sas_device_priv_data->sas_target->handle);
+                if (sas_device)
+                        handle = sas_device->volume_handle;
+                spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
+        } else
+                handle = sas_device_priv_data->sas_target->handle;
+
+        if (!handle) {
+                scmd->result = DID_RESET << 16;
+                r = FAILED;
+                goto out;
+        }
+
+        mutex_lock(&ioc->tm_cmds.mutex);
+        mpt2sas_scsih_issue_tm(ioc, handle, 0,
             MPI2_SCSITASKMGMT_TASKTYPE_TARGET_RESET, 0, 30);
 
         /*
@@ -5255,6 +5361,7 @@ static struct scsi_host_template scsih_driver_template = {
         .change_queue_type              = scsih_change_queue_type,
         .eh_abort_handler               = scsih_abort,
         .eh_device_reset_handler        = scsih_dev_reset,
+        .eh_target_reset_handler        = scsih_target_reset,
         .eh_host_reset_handler          = scsih_host_reset,
         .bios_param                     = scsih_bios_param,
         .can_queue                      = 1,