[SCSI] mpt2sas: New feature - Fast Load Support

New feature Fast Load Support.

(1)Asynchronous SCSI scanning: This will allow the drivers to scan
for devices in parallel while other device drivers are loading at
the same time. This will improve the amount of time it takes for the
OS to load.

(2) Reporting Devices while port enable is active: This feature will
allow devices to be reported to OS immediately while port enable is
active. The previous implementation waits for port enable to complete,
and then report devices. This feature is only enabled on IT firmware
configurations when there are no boot device configured in BIOS Configuration
Utility, else the driver will wait till port enable completes reporting
devices. For IR firmware, this feature is turned off. This feature is to
address large SAS topologies (>100 drives) when the boot OS is using onboard
SATA device, in other words, the boot devices is not
connected to our controller.

(3) Scanning for devices after diagnostic reset completes: A new routine
_scsih_scan_start is added. This will scan the expander pages, IR pages,
and sas device pages, then reporting new devices to SCSI Mid layer. It
seems the driver is not supporting adding devices while diagnostic reset
is active. Apparently this is due to the sanity checks on
ioc->shost_recovery flag throughout the context of kernel work thread FIFO,
and the mpt2sas_fw_work.

Signed-off-by: Nagalakshmi Nandigama <nagalakshmi.nandigama@lsi.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

1 files changed, 348 insertions, 75 deletions

diff --git a/drivers/scsi/mpt2sas/mpt2sas_scsih.c b/drivers/scsi/mpt2sas/mpt2sas_scsih.c
index 1da1aa1a11e2..7a3865d9c959 100644
--- a/drivers/scsi/mpt2sas/mpt2sas_scsih.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_scsih.c
@@ -71,6 +71,9 @@ static void _firmware_event_work(struct work_struct *work);
 
 static u8 _scsih_check_for_pending_tm(struct MPT2SAS_ADAPTER *ioc, u16 smid);
 
+static void _scsih_scan_start(struct Scsi_Host *shost);
+static int _scsih_scan_finished(struct Scsi_Host *shost, unsigned long time);
+
 /* global parameters */
 LIST_HEAD(mpt2sas_ioc_list);
 
@@ -79,6 +82,7 @@ static u8 scsi_io_cb_idx = -1;
 static u8 tm_cb_idx = -1;
 static u8 ctl_cb_idx = -1;
 static u8 base_cb_idx = -1;
+static u8 port_enable_cb_idx = -1;
 static u8 transport_cb_idx = -1;
 static u8 scsih_cb_idx = -1;
 static u8 config_cb_idx = -1;
@@ -103,6 +107,18 @@ static int max_lun = MPT2SAS_MAX_LUN;
 module_param(max_lun, int, 0);
 MODULE_PARM_DESC(max_lun, " max lun, default=16895 ");
 
+/* diag_buffer_enable is bitwise
+ * bit 0 set = TRACE
+ * bit 1 set = SNAPSHOT
+ * bit 2 set = EXTENDED
+ *
+ * Either bit can be set, or both
+ */
+static int diag_buffer_enable = -1;
+module_param(diag_buffer_enable, int, 0);
+MODULE_PARM_DESC(diag_buffer_enable, " post diag buffers "
+        "(TRACE=1/SNAPSHOT=2/EXTENDED=4/default=0)");
+
 /**
  * struct sense_info - common structure for obtaining sense keys
  * @skey: sense key
@@ -117,8 +133,8 @@ struct sense_info {
 
 
 #define MPT2SAS_TURN_ON_FAULT_LED (0xFFFC)
-#define MPT2SAS_RESCAN_AFTER_HOST_RESET (0xFFFF)
-
+#define MPT2SAS_PORT_ENABLE_COMPLETE (0xFFFD)
+#define MPT2SAS_REMOVE_UNRESPONDING_DEVICES (0xFFFF)
 /**
  * struct fw_event_work - firmware event struct
  * @list: link list framework
@@ -424,7 +440,11 @@ _scsih_determine_boot_device(struct MPT2SAS_ADAPTER *ioc,
         u16 slot;
 
          /* only process this function when driver loads */
-        if (!ioc->wait_for_port_enable_to_complete)
+        if (!ioc->is_driver_loading)
+                return;
+
+         /* no Bios, return immediately */
+        if (!ioc->bios_pg3.BiosVersion)
                 return;
 
         if (!is_raid) {
@@ -2714,22 +2734,38 @@ _scsih_fw_event_free(struct MPT2SAS_ADAPTER *ioc, struct fw_event_work
 
 
 /**
- * _scsih_queue_rescan - queue a topology rescan from user context
+ * _scsih_error_recovery_delete_devices - remove devices not responding
  * @ioc: per adapter object
  *
  * Return nothing.
  */
 static void
-_scsih_queue_rescan(struct MPT2SAS_ADAPTER *ioc)
+_scsih_error_recovery_delete_devices(struct MPT2SAS_ADAPTER *ioc)
 {
         struct fw_event_work *fw_event;
 
-        if (ioc->wait_for_port_enable_to_complete)
+        if (ioc->is_driver_loading)
                 return;
+        fw_event->event = MPT2SAS_REMOVE_UNRESPONDING_DEVICES;
+        fw_event->ioc = ioc;
+        _scsih_fw_event_add(ioc, fw_event);
+}
+
+/**
+ * mpt2sas_port_enable_complete - port enable completed (fake event)
+ * @ioc: per adapter object
+ *
+ * Return nothing.
+ */
+void
+mpt2sas_port_enable_complete(struct MPT2SAS_ADAPTER *ioc)
+{
+        struct fw_event_work *fw_event;
+
         fw_event = kzalloc(sizeof(struct fw_event_work), GFP_ATOMIC);
         if (!fw_event)
                 return;
-        fw_event->event = MPT2SAS_RESCAN_AFTER_HOST_RESET;
+        fw_event->event = MPT2SAS_PORT_ENABLE_COMPLETE;
         fw_event->ioc = ioc;
         _scsih_fw_event_add(ioc, fw_event);
 }
@@ -5099,7 +5135,7 @@ _scsih_add_device(struct MPT2SAS_ADAPTER *ioc, u16 handle, u8 phy_num, u8 is_pd)
         /* get device name */
         sas_device->device_name = le64_to_cpu(sas_device_pg0.DeviceName);
 
-        if (ioc->wait_for_port_enable_to_complete)
+        if (ioc->wait_for_discovery_to_complete)
                 _scsih_sas_device_init_add(ioc, sas_device);
         else
                 _scsih_sas_device_add(ioc, sas_device);
@@ -5622,7 +5658,7 @@ broadcast_aen_retry:
         termination_count = 0;
         query_count = 0;
         for (smid = 1; smid <= ioc->scsiio_depth; smid++) {
-                if (ioc->ioc_reset_in_progress_status)
+                if (ioc->shost_recovery)
                         goto out;
                 scmd = _scsih_scsi_lookup_get(ioc, smid);
                 if (!scmd)
@@ -5644,7 +5680,7 @@ broadcast_aen_retry:
                 lun = sas_device_priv_data->lun;
                 query_count++;
 
-                if (ioc->ioc_reset_in_progress_status)
+                if (ioc->shost_recovery)
                         goto out;
 
                 spin_unlock_irqrestore(&ioc->scsi_lookup_lock, flags);
@@ -5686,7 +5722,7 @@ broadcast_aen_retry:
                         goto broadcast_aen_retry;
                 }
 
-                if (ioc->ioc_reset_in_progress_status)
+                if (ioc->shost_recovery)
                         goto out_no_lock;
 
                 r = mpt2sas_scsih_issue_tm(ioc, handle, sdev->channel, sdev->id,
@@ -5725,7 +5761,7 @@ broadcast_aen_retry:
             ioc->name, __func__, query_count, termination_count));
 
         ioc->broadcast_aen_busy = 0;
-        if (!ioc->ioc_reset_in_progress_status)
+        if (!ioc->shost_recovery)
                 _scsih_ublock_io_all_device(ioc);
         mutex_unlock(&ioc->tm_cmds.mutex);
 }
@@ -5845,7 +5881,7 @@ _scsih_sas_volume_add(struct MPT2SAS_ADAPTER *ioc,
         raid_device->handle = handle;
         raid_device->wwid = wwid;
         _scsih_raid_device_add(ioc, raid_device);
-        if (!ioc->wait_for_port_enable_to_complete) {
+        if (!ioc->wait_for_discovery_to_complete) {
                 rc = scsi_add_device(ioc->shost, RAID_CHANNEL,
                     raid_device->id, 0);
                 if (rc)
@@ -6127,6 +6163,10 @@ _scsih_sas_ir_config_change_event(struct MPT2SAS_ADAPTER *ioc,
                 _scsih_sas_ir_config_change_event_debug(ioc, event_data);
 
 #endif
+
+        if (ioc->shost_recovery)
+                return;
+
         foreign_config = (le32_to_cpu(event_data->Flags) &
             MPI2_EVENT_IR_CHANGE_FLAGS_FOREIGN_CONFIG) ? 1 : 0;
 
@@ -6185,6 +6225,9 @@ _scsih_sas_ir_volume_event(struct MPT2SAS_ADAPTER *ioc,
         int rc;
         Mpi2EventDataIrVolume_t *event_data = fw_event->event_data;
 
+        if (ioc->shost_recovery)
+                return;
+
         if (event_data->ReasonCode != MPI2_EVENT_IR_VOLUME_RC_STATE_CHANGED)
                 return;
 
@@ -6267,6 +6310,9 @@ _scsih_sas_ir_physical_disk_event(struct MPT2SAS_ADAPTER *ioc,
         Mpi2EventDataIrPhysicalDisk_t *event_data = fw_event->event_data;
         u64 sas_address;
 
+        if (ioc->shost_recovery)
+                return;
+
         if (event_data->ReasonCode != MPI2_EVENT_IR_PHYSDISK_RC_STATE_CHANGED)
                 return;
 
@@ -6510,10 +6556,10 @@ _scsih_search_responding_sas_devices(struct MPT2SAS_ADAPTER *ioc)
         u32 device_info;
         u16 slot;
 
-        printk(MPT2SAS_INFO_FMT "%s\n", ioc->name, __func__);
+        printk(MPT2SAS_INFO_FMT "search for end-devices: start\n", ioc->name);
 
         if (list_empty(&ioc->sas_device_list))
-                return;
+                goto out;
 
         handle = 0xFFFF;
         while (!(mpt2sas_config_get_sas_device_pg0(ioc, &mpi_reply,
@@ -6532,6 +6578,9 @@ _scsih_search_responding_sas_devices(struct MPT2SAS_ADAPTER *ioc)
                 _scsih_mark_responding_sas_device(ioc, sas_address, slot,
                     handle);
         }
+out:
+        printk(MPT2SAS_INFO_FMT "search for end-devices: complete\n",
+            ioc->name);
 }
 
 /**
@@ -6607,10 +6656,14 @@ _scsih_search_responding_raid_devices(struct MPT2SAS_ADAPTER *ioc)
         u16 handle;
         u8 phys_disk_num;
 
-        printk(MPT2SAS_INFO_FMT "%s\n", ioc->name, __func__);
+        if (!ioc->ir_firmware)
+                return;
+
+        printk(MPT2SAS_INFO_FMT "search for raid volumes: start\n",
+            ioc->name);
 
         if (list_empty(&ioc->raid_device_list))
-                return;
+                goto out;
 
         handle = 0xFFFF;
         while (!(mpt2sas_config_get_raid_volume_pg1(ioc, &mpi_reply,
@@ -6649,6 +6702,9 @@ _scsih_search_responding_raid_devices(struct MPT2SAS_ADAPTER *ioc)
                         set_bit(handle, ioc->pd_handles);
                 }
         }
+out:
+        printk(MPT2SAS_INFO_FMT "search for responding raid volumes: "
+            "complete\n", ioc->name);
 }
 
 /**
@@ -6708,10 +6764,10 @@ _scsih_search_responding_expanders(struct MPT2SAS_ADAPTER *ioc)
         u64 sas_address;
         u16 handle;
 
-        printk(MPT2SAS_INFO_FMT "%s\n", ioc->name, __func__);
+        printk(MPT2SAS_INFO_FMT "search for expanders: start\n", ioc->name);
 
         if (list_empty(&ioc->sas_expander_list))
-                return;
+                goto out;
 
         handle = 0xFFFF;
         while (!(mpt2sas_config_get_expander_pg0(ioc, &mpi_reply, &expander_pg0,
@@ -6730,6 +6786,8 @@ _scsih_search_responding_expanders(struct MPT2SAS_ADAPTER *ioc)
                 _scsih_mark_responding_expander(ioc, sas_address, handle);
         }
 
+ out:
+        printk(MPT2SAS_INFO_FMT "search for expanders: complete\n", ioc->name);
 }
 
 /**
@@ -6745,6 +6803,8 @@ _scsih_remove_unresponding_sas_devices(struct MPT2SAS_ADAPTER *ioc)
         struct _sas_node *sas_expander;
         struct _raid_device *raid_device, *raid_device_next;
 
+        printk(MPT2SAS_INFO_FMT "removing unresponding devices: start\n",
+            ioc->name);
 
         list_for_each_entry_safe(sas_device, sas_device_next,
             &ioc->sas_device_list, list) {
@@ -6764,6 +6824,9 @@ _scsih_remove_unresponding_sas_devices(struct MPT2SAS_ADAPTER *ioc)
                 _scsih_remove_device(ioc, sas_device);
         }
 
+        if (!ioc->ir_firmware)
+                goto retry_expander_search;
+
         list_for_each_entry_safe(raid_device, raid_device_next,
             &ioc->raid_device_list, list) {
                 if (raid_device->responding) {
@@ -6790,52 +6853,170 @@ _scsih_remove_unresponding_sas_devices(struct MPT2SAS_ADAPTER *ioc)
                 mpt2sas_expander_remove(ioc, sas_expander->sas_address);
                 goto retry_expander_search;
         }
+        printk(MPT2SAS_INFO_FMT "removing unresponding devices: complete\n",
+            ioc->name);
+        /* unblock devices */
+        _scsih_ublock_io_all_device(ioc);
+}
+
+static void
+_scsih_refresh_expander_links(struct MPT2SAS_ADAPTER *ioc,
+        struct _sas_node *sas_expander, u16 handle)
+{
+        Mpi2ExpanderPage1_t expander_pg1;
+        Mpi2ConfigReply_t mpi_reply;
+        int i;
+
+        for (i = 0 ; i < sas_expander->num_phys ; i++) {
+                if ((mpt2sas_config_get_expander_pg1(ioc, &mpi_reply,
+                    &expander_pg1, i, handle))) {
+                        printk(MPT2SAS_ERR_FMT "failure at %s:%d/%s()!\n",
+                            ioc->name, __FILE__, __LINE__, __func__);
+                        return;
+                }
+
+                mpt2sas_transport_update_links(ioc, sas_expander->sas_address,
+                    le16_to_cpu(expander_pg1.AttachedDevHandle), i,
+                    expander_pg1.NegotiatedLinkRate >> 4);
+        }
 }
 
 /**
- * _scsih_hide_unhide_sas_devices - add/remove device to/from OS
+ * _scsih_scan_for_devices_after_reset - scan for devices after host reset
  * @ioc: per adapter object
  *
  * Return nothing.
  */
 static void
-_scsih_hide_unhide_sas_devices(struct MPT2SAS_ADAPTER *ioc)
+_scsih_scan_for_devices_after_reset(struct MPT2SAS_ADAPTER *ioc)
 {
-        struct _sas_device *sas_device, *sas_device_next;
+        Mpi2ExpanderPage0_t expander_pg0;
+        Mpi2SasDevicePage0_t sas_device_pg0;
+        Mpi2RaidVolPage1_t volume_pg1;
+        Mpi2RaidVolPage0_t volume_pg0;
+        Mpi2RaidPhysDiskPage0_t pd_pg0;
+        Mpi2EventIrConfigElement_t element;
+        Mpi2ConfigReply_t mpi_reply;
+        u8 phys_disk_num;
+        u16 ioc_status;
+        u16 handle, parent_handle;
+        u64 sas_address;
+        struct _sas_device *sas_device;
+        struct _sas_node *expander_device;
+        static struct _raid_device *raid_device;
 
-        if (!ioc->is_warpdrive || ioc->mfg_pg10_hide_flag !=
-            MFG_PAGE10_HIDE_IF_VOL_PRESENT)
-                return;
+        printk(MPT2SAS_INFO_FMT "scan devices: start\n", ioc->name);
 
-        if (ioc->hide_drives) {
-                if (_scsih_get_num_volumes(ioc))
-                        return;
-                ioc->hide_drives = 0;
-                list_for_each_entry_safe(sas_device, sas_device_next,
-                    &ioc->sas_device_list, list) {
-                        if (!mpt2sas_transport_port_add(ioc, sas_device->handle,
-                                sas_device->sas_address_parent)) {
-                                _scsih_sas_device_remove(ioc, sas_device);
-                        } else if (!sas_device->starget) {
-                                mpt2sas_transport_port_remove(ioc,
-                                    sas_device->sas_address,
-                                    sas_device->sas_address_parent);
-                                _scsih_sas_device_remove(ioc, sas_device);
-                        }
+        _scsih_sas_host_refresh(ioc);
+
+        /* expanders */
+        handle = 0xFFFF;
+        while (!(mpt2sas_config_get_expander_pg0(ioc, &mpi_reply, &expander_pg0,
+            MPI2_SAS_EXPAND_PGAD_FORM_GET_NEXT_HNDL, handle))) {
+                ioc_status = le16_to_cpu(mpi_reply.IOCStatus) &
+                    MPI2_IOCSTATUS_MASK;
+                if (ioc_status == MPI2_IOCSTATUS_CONFIG_INVALID_PAGE)
+                        break;
+                handle = le16_to_cpu(expander_pg0.DevHandle);
+                expander_device = mpt2sas_scsih_expander_find_by_sas_address(
+                    ioc, le64_to_cpu(expander_pg0.SASAddress));
+                if (expander_device)
+                        _scsih_refresh_expander_links(ioc, expander_device,
+                            handle);
+                else
+                        _scsih_expander_add(ioc, handle);
+        }
+
+        if (!ioc->ir_firmware)
+                goto skip_to_sas;
+
+        /* phys disk */
+        phys_disk_num = 0xFF;
+        while (!(mpt2sas_config_get_phys_disk_pg0(ioc, &mpi_reply,
+            &pd_pg0, MPI2_PHYSDISK_PGAD_FORM_GET_NEXT_PHYSDISKNUM,
+            phys_disk_num))) {
+                ioc_status = le16_to_cpu(mpi_reply.IOCStatus) &
+                    MPI2_IOCSTATUS_MASK;
+                if (ioc_status == MPI2_IOCSTATUS_CONFIG_INVALID_PAGE)
+                        break;
+                phys_disk_num = pd_pg0.PhysDiskNum;
+                handle = le16_to_cpu(pd_pg0.DevHandle);
+                sas_device = _scsih_sas_device_find_by_handle(ioc, handle);
+                if (sas_device)
+                        continue;
+                if (mpt2sas_config_get_sas_device_pg0(ioc, &mpi_reply,
+                    &sas_device_pg0, MPI2_SAS_DEVICE_PGAD_FORM_HANDLE,
+                    handle) != 0)
+                        continue;
+                parent_handle = le16_to_cpu(sas_device_pg0.ParentDevHandle);
+                if (!_scsih_get_sas_address(ioc, parent_handle,
+                    &sas_address)) {
+                        mpt2sas_transport_update_links(ioc, sas_address,
+                            handle, sas_device_pg0.PhyNum,
+                            MPI2_SAS_NEG_LINK_RATE_1_5);
+                        set_bit(handle, ioc->pd_handles);
+                        _scsih_add_device(ioc, handle, 0, 1);
                 }
-        } else {
-                if (!_scsih_get_num_volumes(ioc))
-                        return;
-                ioc->hide_drives = 1;
-                list_for_each_entry_safe(sas_device, sas_device_next,
-                    &ioc->sas_device_list, list) {
-                        mpt2sas_transport_port_remove(ioc,
-                            sas_device->sas_address,
-                            sas_device->sas_address_parent);
+        }
+
+        /* volumes */
+        handle = 0xFFFF;
+        while (!(mpt2sas_config_get_raid_volume_pg1(ioc, &mpi_reply,
+            &volume_pg1, MPI2_RAID_VOLUME_PGAD_FORM_GET_NEXT_HANDLE, handle))) {
+                ioc_status = le16_to_cpu(mpi_reply.IOCStatus) &
+                    MPI2_IOCSTATUS_MASK;
+                if (ioc_status == MPI2_IOCSTATUS_CONFIG_INVALID_PAGE)
+                        break;
+                handle = le16_to_cpu(volume_pg1.DevHandle);
+                raid_device = _scsih_raid_device_find_by_wwid(ioc,
+                    le64_to_cpu(volume_pg1.WWID));
+                if (raid_device)
+                        continue;
+                if (mpt2sas_config_get_raid_volume_pg0(ioc, &mpi_reply,
+                    &volume_pg0, MPI2_RAID_VOLUME_PGAD_FORM_HANDLE, handle,
+                     sizeof(Mpi2RaidVolPage0_t)))
+                        continue;
+                if (volume_pg0.VolumeState == MPI2_RAID_VOL_STATE_OPTIMAL ||
+                    volume_pg0.VolumeState == MPI2_RAID_VOL_STATE_ONLINE ||
+                    volume_pg0.VolumeState == MPI2_RAID_VOL_STATE_DEGRADED) {
+                        memset(&element, 0, sizeof(Mpi2EventIrConfigElement_t));
+                        element.ReasonCode = MPI2_EVENT_IR_CHANGE_RC_ADDED;
+                        element.VolDevHandle = volume_pg1.DevHandle;
+                        _scsih_sas_volume_add(ioc, &element);
+                }
+        }
+
+ skip_to_sas:
+
+        /* sas devices */
+        handle = 0xFFFF;
+        while (!(mpt2sas_config_get_sas_device_pg0(ioc, &mpi_reply,
+            &sas_device_pg0, MPI2_SAS_DEVICE_PGAD_FORM_GET_NEXT_HANDLE,
+            handle))) {
+                ioc_status = le16_to_cpu(mpi_reply.IOCStatus) &
+                    MPI2_IOCSTATUS_MASK;
+                if (ioc_status == MPI2_IOCSTATUS_CONFIG_INVALID_PAGE)
+                        break;
+                handle = le16_to_cpu(sas_device_pg0.DevHandle);
+                if (!(_scsih_is_end_device(
+                    le32_to_cpu(sas_device_pg0.DeviceInfo))))
+                        continue;
+                sas_device = mpt2sas_scsih_sas_device_find_by_sas_address(ioc,
+                    le64_to_cpu(sas_device_pg0.SASAddress));
+                if (sas_device)
+                        continue;
+                parent_handle = le16_to_cpu(sas_device_pg0.ParentDevHandle);
+                if (!_scsih_get_sas_address(ioc, parent_handle, &sas_address)) {
+                        mpt2sas_transport_update_links(ioc, sas_address, handle,
+                            sas_device_pg0.PhyNum, MPI2_SAS_NEG_LINK_RATE_1_5);
+                        _scsih_add_device(ioc, handle, 0, 0);
                 }
         }
+
+        printk(MPT2SAS_INFO_FMT "scan devices: complete\n", ioc->name);
 }
 
+
 /**
  * mpt2sas_scsih_reset_handler - reset callback handler (for scsih)
  * @ioc: per adapter object
@@ -6871,7 +7052,6 @@ mpt2sas_scsih_reset_handler(struct MPT2SAS_ADAPTER *ioc, int reset_phase)
                 }
                 _scsih_fw_event_cleanup_queue(ioc);
                 _scsih_flush_running_cmds(ioc);
-                _scsih_queue_rescan(ioc);
                 break;
         case MPT2_IOC_DONE_RESET:
                 dtmprintk(ioc, printk(MPT2SAS_INFO_FMT "%s: "
@@ -6881,6 +7061,7 @@ mpt2sas_scsih_reset_handler(struct MPT2SAS_ADAPTER *ioc, int reset_phase)
                 _scsih_search_responding_sas_devices(ioc);
                 _scsih_search_responding_raid_devices(ioc);
                 _scsih_search_responding_expanders(ioc);
+                        _scsih_error_recovery_delete_devices(ioc);
                 break;
         }
 }
@@ -6898,7 +7079,6 @@ _firmware_event_work(struct work_struct *work)
 {
         struct fw_event_work *fw_event = container_of(work,
             struct fw_event_work, delayed_work.work);
-        unsigned long flags;
         struct MPT2SAS_ADAPTER *ioc = fw_event->ioc;
 
         /* the queue is being flushed so ignore this event */
@@ -6908,23 +7088,31 @@ _firmware_event_work(struct work_struct *work)
                 return;
         }
 
-        if (fw_event->event == MPT2SAS_RESCAN_AFTER_HOST_RESET) {
-                _scsih_fw_event_free(ioc, fw_event);
-                spin_lock_irqsave(&ioc->ioc_reset_in_progress_lock, flags);
-                if (ioc->shost_recovery) {
-                        init_completion(&ioc->shost_recovery_done);
-                        spin_unlock_irqrestore(&ioc->ioc_reset_in_progress_lock,
-                            flags);
-                        wait_for_completion(&ioc->shost_recovery_done);
-                } else
-                        spin_unlock_irqrestore(&ioc->ioc_reset_in_progress_lock,
-                            flags);
+        switch (fw_event->event) {
+        case MPT2SAS_REMOVE_UNRESPONDING_DEVICES:
+                while (scsi_host_in_recovery(ioc->shost))
+                        ssleep(1);
                 _scsih_remove_unresponding_sas_devices(ioc);
-                _scsih_hide_unhide_sas_devices(ioc);
-                return;
-        }
+                _scsih_scan_for_devices_after_reset(ioc);
+                break;
+        case MPT2SAS_PORT_ENABLE_COMPLETE:
+                if (!ioc->is_driver_loading && ioc->shost_recovery) {
+                        _scsih_prep_device_scan(ioc);
+                        _scsih_search_responding_sas_devices(ioc);
+                        _scsih_search_responding_raid_devices(ioc);
+                        _scsih_search_responding_expanders(ioc);
+                }
 
-        switch (fw_event->event) {
+                if (ioc->start_scan)
+                        ioc->start_scan = 0;
+                else
+                        complete(&ioc->port_enable_done);
+
+
+
+                dewtprintk(ioc, printk(MPT2SAS_INFO_FMT "port enable: complete "
+                    "from worker thread\n", ioc->name));
+                break;
         case MPT2SAS_TURN_ON_FAULT_LED:
                 _scsih_turn_on_fault_led(ioc, fw_event->device_handle);
                 break;
@@ -7121,6 +7309,8 @@ static struct scsi_host_template scsih_driver_template = {
         .slave_configure                = _scsih_slave_configure,
         .target_destroy                 = _scsih_target_destroy,
         .slave_destroy                  = _scsih_slave_destroy,
+        .scan_finished                  = _scsih_scan_finished,
+        .scan_start                     = _scsih_scan_start,
         .change_queue_depth             = _scsih_change_queue_depth,
         .change_queue_type              = _scsih_change_queue_type,
         .eh_abort_handler               = _scsih_abort,
@@ -7381,7 +7571,12 @@ _scsih_probe_boot_devices(struct MPT2SAS_ADAPTER *ioc)
         unsigned long flags;
         int rc;
 
+         /* no Bios, return immediately */
+        if (!ioc->bios_pg3.BiosVersion)
+                return;
+
         device = NULL;
+        is_raid = 0;
         if (ioc->req_boot_device.device) {
                 device =  ioc->req_boot_device.device;
                 is_raid = ioc->req_boot_device.is_raid;
@@ -7490,9 +7685,7 @@ _scsih_probe_sas(struct MPT2SAS_ADAPTER *ioc)
 static void
 _scsih_probe_devices(struct MPT2SAS_ADAPTER *ioc)
 {
-        u16 volume_mapping_flags =
-            le16_to_cpu(ioc->ioc_pg8.IRVolumeMappingFlags) &
-            MPI2_IOCPAGE8_IRFLAGS_MASK_VOLUME_MAPPING_MODE;
+        u16 volume_mapping_flags;
 
         if (!(ioc->facts.ProtocolFlags & MPI2_IOCFACTS_PROTOCOL_SCSI_INITIATOR))
                 return;  /* return when IOC doesn't support initiator mode */
@@ -7500,18 +7693,93 @@ _scsih_probe_devices(struct MPT2SAS_ADAPTER *ioc)
         _scsih_probe_boot_devices(ioc);
 
         if (ioc->ir_firmware) {
-                if ((volume_mapping_flags &
-                     MPI2_IOCPAGE8_IRFLAGS_HIGH_VOLUME_MAPPING)) {
-                        _scsih_probe_sas(ioc);
+                volume_mapping_flags =
+                    le16_to_cpu(ioc->ioc_pg8.IRVolumeMappingFlags) &
+                    MPI2_IOCPAGE8_IRFLAGS_MASK_VOLUME_MAPPING_MODE;
+                if (volume_mapping_flags ==
+                    MPI2_IOCPAGE8_IRFLAGS_LOW_VOLUME_MAPPING) {
                         _scsih_probe_raid(ioc);
+                        _scsih_probe_sas(ioc);
                 } else {
-                        _scsih_probe_raid(ioc);
                         _scsih_probe_sas(ioc);
+                        _scsih_probe_raid(ioc);
                 }
         } else
                 _scsih_probe_sas(ioc);
 }
 
+
+/**
+ * _scsih_scan_start - scsi lld callback for .scan_start
+ * @shost: SCSI host pointer
+ *
+ * The shost has the ability to discover targets on its own instead
+ * of scanning the entire bus.  In our implemention, we will kick off
+ * firmware discovery.
+ */
+static void
+_scsih_scan_start(struct Scsi_Host *shost)
+{
+        struct MPT2SAS_ADAPTER *ioc = shost_priv(shost);
+        int rc;
+
+        if (diag_buffer_enable != -1 && diag_buffer_enable != 0)
+                mpt2sas_enable_diag_buffer(ioc, diag_buffer_enable);
+
+        ioc->start_scan = 1;
+        rc = mpt2sas_port_enable(ioc);
+
+        if (rc != 0)
+                printk(MPT2SAS_INFO_FMT "port enable: FAILED\n", ioc->name);
+}
+
+/**
+ * _scsih_scan_finished - scsi lld callback for .scan_finished
+ * @shost: SCSI host pointer
+ * @time: elapsed time of the scan in jiffies
+ *
+ * This function will be called periodically until it returns 1 with the
+ * scsi_host and the elapsed time of the scan in jiffies. In our implemention,
+ * we wait for firmware discovery to complete, then return 1.
+ */
+static int
+_scsih_scan_finished(struct Scsi_Host *shost, unsigned long time)
+{
+        struct MPT2SAS_ADAPTER *ioc = shost_priv(shost);
+
+        if (time >= (300 * HZ)) {
+                ioc->base_cmds.status = MPT2_CMD_NOT_USED;
+                printk(MPT2SAS_INFO_FMT "port enable: FAILED with timeout "
+                    "(timeout=300s)\n", ioc->name);
+                ioc->is_driver_loading = 0;
+                return 1;
+        }
+
+        if (ioc->start_scan)
+                return 0;
+
+        if (ioc->start_scan_failed) {
+                printk(MPT2SAS_INFO_FMT "port enable: FAILED with "
+                    "(ioc_status=0x%08x)\n", ioc->name, ioc->start_scan_failed);
+                ioc->is_driver_loading = 0;
+                ioc->wait_for_discovery_to_complete = 0;
+                ioc->remove_host = 1;
+                return 1;
+        }
+
+        printk(MPT2SAS_INFO_FMT "port enable: SUCCESS\n", ioc->name);
+        ioc->base_cmds.status = MPT2_CMD_NOT_USED;
+
+        if (ioc->wait_for_discovery_to_complete) {
+                ioc->wait_for_discovery_to_complete = 0;
+                _scsih_probe_devices(ioc);
+        }
+        mpt2sas_base_start_watchdog(ioc);
+        ioc->is_driver_loading = 0;
+        return 1;
+}
+
+
 /**
  * _scsih_probe - attach and add scsi host
  * @pdev: PCI device struct
@@ -7548,6 +7816,7 @@ _scsih_probe(struct pci_dev *pdev, const struct pci_device_id *id)
         ioc->tm_cb_idx = tm_cb_idx;
         ioc->ctl_cb_idx = ctl_cb_idx;
         ioc->base_cb_idx = base_cb_idx;
+        ioc->port_enable_cb_idx = port_enable_cb_idx;
         ioc->transport_cb_idx = transport_cb_idx;
         ioc->scsih_cb_idx = scsih_cb_idx;
         ioc->config_cb_idx = config_cb_idx;
@@ -7620,14 +7889,14 @@ _scsih_probe(struct pci_dev *pdev, const struct pci_device_id *id)
                 goto out_thread_fail;
         }
 
-        ioc->wait_for_port_enable_to_complete = 1;
+        ioc->is_driver_loading = 1;
         if ((mpt2sas_base_attach(ioc))) {
                 printk(MPT2SAS_ERR_FMT "failure at %s:%d/%s()!\n",
                     ioc->name, __FILE__, __LINE__, __func__);
                 goto out_attach_fail;
         }
 
-        ioc->wait_for_port_enable_to_complete = 0;
+        scsi_scan_host(shost);
         if (ioc->is_warpdrive) {
                 if (ioc->mfg_pg10_hide_flag ==  MFG_PAGE10_EXPOSE_ALL_DISKS)
                         ioc->hide_drives = 0;
@@ -7650,6 +7919,7 @@ _scsih_probe(struct pci_dev *pdev, const struct pci_device_id *id)
  out_thread_fail:
         list_del(&ioc->list);
         scsi_remove_host(shost);
+        scsi_host_put(shost);
  out_add_shost_fail:
         return -ENODEV;
 }
@@ -7896,6 +8166,8 @@ _scsih_init(void)
 
         /* base internal commands callback handler */
         base_cb_idx = mpt2sas_base_register_callback_handler(mpt2sas_base_done);
+        port_enable_cb_idx = mpt2sas_base_register_callback_handler(
+                mpt2sas_port_enable_done);
 
         /* transport internal commands callback handler */
         transport_cb_idx = mpt2sas_base_register_callback_handler(
@@ -7950,6 +8222,7 @@ _scsih_exit(void)
         mpt2sas_base_release_callback_handler(scsi_io_cb_idx);
         mpt2sas_base_release_callback_handler(tm_cb_idx);
         mpt2sas_base_release_callback_handler(base_cb_idx);
+        mpt2sas_base_release_callback_handler(port_enable_cb_idx);
         mpt2sas_base_release_callback_handler(transport_cb_idx);
         mpt2sas_base_release_callback_handler(scsih_cb_idx);
         mpt2sas_base_release_callback_handler(config_cb_idx);