[SCSI] mpt2sas : WarpDrive New product SSS6200 support added

This patch has Support for the new solid state device product SSS6200
from LSI and relavent features w.r.t SSS6200.

The major feature added in this driver is supporting Direct-I/O to the
SSS6200 storage.There are some additional changes done to avoid exposing
the RAID member disks to the OS and hiding/exposing drives based on the
OEM Specific Flag in Manufacturing Page10 (this is required to handle
specific changes in the SSS6200 firmware).

Each and every changes are listed below.
1. Hiding IR related messages.
For SSS6200, the driver is modified not to print IR related events.
Even if the debugging is enabled the IR related messages will not be displayed.
In some places if there is a need to display a message related to IR the
string "IR" is replaced with string "DD" and the string "volume" is replaced
with "direct drive". But the function names are not changed hence there are
some places where the reference to volume can be seen if debug level is set.

2. Removed RAID transport support
In Linux the user can retrieve RAID volume information from the sysfs directory.
This support is removed for SSS6200.

3. Direct I/O support.
The driver tries to enable direct I/O when a volume is reported to the driver
by the firmware through IRCC events and the driver does this just before
reporting to the OS, hence all the OS issued I/O can go through direct path
if they can, The first validation is to see whether the manufacturing page10
flag is set to expose all drives always. If that is set, the driver will not
enable direct I/O and displays the message "DDIO" is disabled globally as
drives are exposed. The driver checks whether there is more than one volume
in the controller, if so the direct I/O will be disabled globally for all
volumes in the controller and the message displayed will be "DDIO is disabled
globally as number of drives > 1.
If retrieving number of PD is failed the driver will not enable direct I/O
and displays the message Failure in computing number of drives DDIO disabled.
If memory allocation for RAIDVolumePage0 is failed, the driver will not enable
direct I/O and displays the message Memory allocation failure for
RVPG0 DDIO disabled.  If retrieving RAIDVolumePage0 is failed the driver will
not enable direct I/O and displays the message Failure in retrieving
RVPG0 DDIO disabled

If the number of PD in a volume is greater than 8, then the direct I/O will
be disabled.
If any of individual drives handle retrieval is failed then the DD-IO will
be disabled.
If the volume is not RAID0 or if the block size is not 512 then the DD-IO will
be disabled.
If the volume size is greater than 2TB then the DD-IO will be disabled.
If the driver is not able to find a valid stripe exponent using the configured
stripe size then the DD-IO will be disabled

When the DD-IO is enabled the driver will check every I/O request issued to
the storage and checks whether the request is either
READ6/WRITE6/READ10/WRITE10, if it is and if the complete I/O transfer
is within a stripe size then the I/O is redirected to
the drive directly instead of the volume.

On completion of every I/O, if the completion is failure means if the reply
is address reply with a reply frame associated with it, then the type of I/O
will be checked, if the I/O is direct then the I/O will be retried to
the volume once.

Signed-off-by: Kashyap Desai <kashyap.desai@lsi.com>
Reviewed-by: Eric Moore <eric.moore@lsi.com>
Reviewed-by: Sathya Prakash <sathya.prakash@lsi.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

5 files changed, 637 insertions, 74 deletions

diff --git a/drivers/scsi/mpt2sas/mpt2sas_base.c b/drivers/scsi/mpt2sas/mpt2sas_base.c
index 3346357031e..efa0255491c 100644
--- a/drivers/scsi/mpt2sas/mpt2sas_base.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_base.c
@@ -522,7 +522,8 @@ _base_display_event_data(struct MPT2SAS_ADAPTER *ioc,
 		desc = "Device Status Change";
 		break;
 	case MPI2_EVENT_IR_OPERATION_STATUS:
-		desc = "IR Operation Status";
+		if (!ioc->hide_ir_msg)
+			desc = "IR Operation Status";
 		break;
 	case MPI2_EVENT_SAS_DISCOVERY:
 	{
@@ -553,16 +554,20 @@ _base_display_event_data(struct MPT2SAS_ADAPTER *ioc,
 		desc = "SAS Enclosure Device Status Change";
 		break;
 	case MPI2_EVENT_IR_VOLUME:
-		desc = "IR Volume";
+		if (!ioc->hide_ir_msg)
+			desc = "IR Volume";
 		break;
 	case MPI2_EVENT_IR_PHYSICAL_DISK:
-		desc = "IR Physical Disk";
+		if (!ioc->hide_ir_msg)
+			desc = "IR Physical Disk";
 		break;
 	case MPI2_EVENT_IR_CONFIGURATION_CHANGE_LIST:
-		desc = "IR Configuration Change List";
+		if (!ioc->hide_ir_msg)
+			desc = "IR Configuration Change List";
 		break;
 	case MPI2_EVENT_LOG_ENTRY_ADDED:
-		desc = "Log Entry Added";
+		if (!ioc->hide_ir_msg)
+			desc = "Log Entry Added";
 		break;
 	}
 
@@ -616,7 +621,10 @@ _base_sas_log_info(struct MPT2SAS_ADAPTER *ioc , u32 log_info)
 		originator_str = "PL";
 		break;
 	case 2:
-		originator_str = "IR";
+		if (!ioc->hide_ir_msg)
+			originator_str = "IR";
+		else
+			originator_str = "WarpDrive";
 		break;
 	}
 
@@ -1508,6 +1516,7 @@ mpt2sas_base_free_smid(struct MPT2SAS_ADAPTER *ioc, u16 smid)
 		}
 		ioc->scsi_lookup[i].cb_idx = 0xFF;
 		ioc->scsi_lookup[i].scmd = NULL;
+		ioc->scsi_lookup[i].direct_io = 0;
 		list_add_tail(&ioc->scsi_lookup[i].tracker_list,
 		    &ioc->free_list);
 		spin_unlock_irqrestore(&ioc->scsi_lookup_lock, flags);
@@ -1844,10 +1853,12 @@ _base_display_ioc_capabilities(struct MPT2SAS_ADAPTER *ioc)
 	printk("), ");
 	printk("Capabilities=(");
 
-	if (ioc->facts.IOCCapabilities &
-	    MPI2_IOCFACTS_CAPABILITY_INTEGRATED_RAID) {
-		printk("Raid");
-		i++;
+	if (!ioc->hide_ir_msg) {
+		if (ioc->facts.IOCCapabilities &
+		    MPI2_IOCFACTS_CAPABILITY_INTEGRATED_RAID) {
+			printk("Raid");
+			i++;
+		}
 	}
 
 	if (ioc->facts.IOCCapabilities & MPI2_IOCFACTS_CAPABILITY_TLR) {
@@ -3680,6 +3691,7 @@ _base_make_ioc_operational(struct MPT2SAS_ADAPTER *ioc, int sleep_flag)
 	u32 reply_address;
 	u16 smid;
 	struct _tr_list *delayed_tr, *delayed_tr_next;
+	u8 hide_flag;
 
 	dinitprintk(ioc, printk(MPT2SAS_INFO_FMT "%s\n", ioc->name,
 	    __func__));
@@ -3706,6 +3718,7 @@ _base_make_ioc_operational(struct MPT2SAS_ADAPTER *ioc, int sleep_flag)
 		ioc->scsi_lookup[i].cb_idx = 0xFF;
 		ioc->scsi_lookup[i].smid = smid;
 		ioc->scsi_lookup[i].scmd = NULL;
+		ioc->scsi_lookup[i].direct_io = 0;
 		list_add_tail(&ioc->scsi_lookup[i].tracker_list,
 		    &ioc->free_list);
 	}
@@ -3766,6 +3779,15 @@ _base_make_ioc_operational(struct MPT2SAS_ADAPTER *ioc, int sleep_flag)
 	if (sleep_flag == CAN_SLEEP)
 		_base_static_config_pages(ioc);
 
+	if (ioc->wait_for_port_enable_to_complete && ioc->is_warpdrive) {
+		if (ioc->manu_pg10.OEMIdentifier  == 0x80) {
+			hide_flag = (u8) (ioc->manu_pg10.OEMSpecificFlags0 &
+			    MFG_PAGE10_HIDE_SSDS_MASK);
+			if (hide_flag != MFG_PAGE10_HIDE_SSDS_MASK)
+				ioc->mfg_pg10_hide_flag = hide_flag;
+		}
+	}
+
 	if (ioc->wait_for_port_enable_to_complete) {
 		if (diag_buffer_enable != 0)
 			mpt2sas_enable_diag_buffer(ioc, diag_buffer_enable);
diff --git a/drivers/scsi/mpt2sas/mpt2sas_base.h b/drivers/scsi/mpt2sas/mpt2sas_base.h
index 500328245f6..2a3c05f6db8 100644
--- a/drivers/scsi/mpt2sas/mpt2sas_base.h
+++ b/drivers/scsi/mpt2sas/mpt2sas_base.h
@@ -69,11 +69,11 @@
 #define MPT2SAS_DRIVER_NAME		"mpt2sas"
 #define MPT2SAS_AUTHOR	"LSI Corporation <DL-MPTFusionLinux@lsi.com>"
 #define MPT2SAS_DESCRIPTION	"LSI MPT Fusion SAS 2.0 Device Driver"
-#define MPT2SAS_DRIVER_VERSION		"08.100.00.00"
+#define MPT2SAS_DRIVER_VERSION		"08.100.00.01"
 #define MPT2SAS_MAJOR_VERSION		08
 #define MPT2SAS_MINOR_VERSION		100
 #define MPT2SAS_BUILD_VERSION		00
-#define MPT2SAS_RELEASE_VERSION		00
+#define MPT2SAS_RELEASE_VERSION		01
 
 /*
  * Set MPT2SAS_SG_DEPTH value based on user input.
@@ -189,6 +189,16 @@
 #define MPT2SAS_HP_DAUGHTER_2_4_INTERNAL_SSDID        0x0046
 
 /*
+ *  WarpDrive Specific Log codes
+ */
+
+#define MPT2_WARPDRIVE_LOGENTRY		(0x8002)
+#define MPT2_WARPDRIVE_LC_SSDT		(0x41)
+#define MPT2_WARPDRIVE_LC_SSDLW		(0x43)
+#define MPT2_WARPDRIVE_LC_SSDLF		(0x44)
+#define MPT2_WARPDRIVE_LC_BRMF		(0x4D)
+
+/*
  * per target private data
  */
 #define MPT_TARGET_FLAGS_RAID_COMPONENT	0x01
@@ -199,6 +209,7 @@
  * struct MPT2SAS_TARGET - starget private hostdata
  * @starget: starget object
  * @sas_address: target sas address
+ * @raid_device: raid_device pointer to access volume data
  * @handle: device handle
  * @num_luns: number luns
  * @flags: MPT_TARGET_FLAGS_XXX flags
@@ -208,6 +219,7 @@
 struct MPT2SAS_TARGET {
 	struct scsi_target *starget;
 	u64	sas_address;
+	struct _raid_device *raid_device;
 	u16	handle;
 	int	num_luns;
 	u32	flags;
@@ -215,6 +227,7 @@ struct MPT2SAS_TARGET {
 	u8	tm_busy;
 };
 
+
 /*
  * per device private data
  */
@@ -262,6 +275,12 @@ typedef struct _MPI2_CONFIG_PAGE_MAN_10 {
   MPI2_POINTER PTR_MPI2_CONFIG_PAGE_MAN_10,
   Mpi2ManufacturingPage10_t, MPI2_POINTER pMpi2ManufacturingPage10_t;
 
+#define MFG_PAGE10_HIDE_SSDS_MASK	(0x00000003)
+#define MFG_PAGE10_HIDE_ALL_DISKS	(0x00)
+#define MFG_PAGE10_EXPOSE_ALL_DISKS	(0x01)
+#define MFG_PAGE10_HIDE_IF_VOL_PRESENT	(0x02)
+
+
 struct MPT2SAS_DEVICE {
 	struct MPT2SAS_TARGET *sas_target;
 	unsigned int	lun;
@@ -341,6 +360,7 @@ struct _sas_device {
  * @sdev: scsi device struct (volumes are single lun)
  * @wwid: unique identifier for the volume
  * @handle: device handle
+ * @block_size: Block size of the volume
  * @id: target id
  * @channel: target channel
  * @volume_type: the raid level
@@ -348,20 +368,33 @@ struct _sas_device {
  * @num_pds: number of hidden raid components
  * @responding: used in _scsih_raid_device_mark_responding
  * @percent_complete: resync percent complete
+ * @direct_io_enabled: Whether direct io to PDs are allowed or not
+ * @stripe_exponent: X where 2powX is the stripe sz in blocks
+ * @max_lba: Maximum number of LBA in the volume
+ * @stripe_sz: Stripe Size of the volume
+ * @device_info: Device info of the volume member disk
+ * @pd_handle: Array of handles of the physical drives for direct I/O in le16
  */
+#define MPT_MAX_WARPDRIVE_PDS		8
 struct _raid_device {
 	struct list_head list;
 	struct scsi_target *starget;
 	struct scsi_device *sdev;
 	u64	wwid;
 	u16	handle;
+	u16	block_sz;
 	int	id;
 	int	channel;
 	u8	volume_type;
-	u32	device_info;
 	u8	num_pds;
 	u8	responding;
 	u8	percent_complete;
+	u8	direct_io_enabled;
+	u8	stripe_exponent;
+	u64	max_lba;
+	u32	stripe_sz;
+	u32	device_info;
+	u16	pd_handle[MPT_MAX_WARPDRIVE_PDS];
 };
 
 /**
@@ -470,6 +503,7 @@ struct chain_tracker {
  * @smid: system message id
  * @scmd: scsi request pointer
  * @cb_idx: callback index
+ * @direct_io: To indicate whether I/O is direct (WARPDRIVE)
  * @chain_list: list of chains associated to this IO
  * @tracker_list: list of free request (ioc->free_list)
  */
@@ -477,14 +511,14 @@ struct scsiio_tracker {
 	u16	smid;
 	struct scsi_cmnd *scmd;
 	u8	cb_idx;
+	u8	direct_io;
 	struct list_head chain_list;
 	struct list_head tracker_list;
 };
 
 /**
- * struct request_tracker - misc mf request tracker
+ * struct request_tracker - firmware request tracker
  * @smid: system message id
- * @scmd: scsi request pointer
  * @cb_idx: callback index
  * @tracker_list: list of free request (ioc->free_list)
  */
@@ -832,6 +866,11 @@ struct MPT2SAS_ADAPTER {
 	u32		diagnostic_flags[MPI2_DIAG_BUF_TYPE_COUNT];
 	u32		ring_buffer_offset;
 	u32		ring_buffer_sz;
+	u8		is_warpdrive;
+	u8		hide_ir_msg;
+	u8		mfg_pg10_hide_flag;
+	u8		hide_drives;
+
 };
 
 typedef u8 (*MPT_CALLBACK)(struct MPT2SAS_ADAPTER *ioc, u16 smid, u8 msix_index,
diff --git a/drivers/scsi/mpt2sas/mpt2sas_ctl.c b/drivers/scsi/mpt2sas/mpt2sas_ctl.c
index 1c6d2b405ee..2661e4fe935 100644
--- a/drivers/scsi/mpt2sas/mpt2sas_ctl.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_ctl.c
@@ -1034,7 +1034,10 @@ _ctl_getiocinfo(void __user *arg)
 	    __func__));
 
 	memset(&karg, 0 , sizeof(karg));
-	karg.adapter_type = MPT2_IOCTL_INTERFACE_SAS2;
+	if (ioc->is_warpdrive)
+		karg.adapter_type = MPT2_IOCTL_INTERFACE_SAS2_SSS6200;
+	else
+		karg.adapter_type = MPT2_IOCTL_INTERFACE_SAS2;
 	if (ioc->pfacts)
 		karg.port_number = ioc->pfacts[0].PortNumber;
 	pci_read_config_byte(ioc->pdev, PCI_CLASS_REVISION, &revision);
diff --git a/drivers/scsi/mpt2sas/mpt2sas_ctl.h b/drivers/scsi/mpt2sas/mpt2sas_ctl.h
index 69916e46e04..11ff1d5fb8f 100644
--- a/drivers/scsi/mpt2sas/mpt2sas_ctl.h
+++ b/drivers/scsi/mpt2sas/mpt2sas_ctl.h
@@ -133,6 +133,7 @@ struct mpt2_ioctl_pci_info {
 #define MPT2_IOCTL_INTERFACE_FC_IP	(0x02)
 #define MPT2_IOCTL_INTERFACE_SAS	(0x03)
 #define MPT2_IOCTL_INTERFACE_SAS2	(0x04)
+#define MPT2_IOCTL_INTERFACE_SAS2_SSS6200	(0x05)
 #define MPT2_IOCTL_VERSION_LENGTH	(32)
 
 /**
diff --git a/drivers/scsi/mpt2sas/mpt2sas_scsih.c b/drivers/scsi/mpt2sas/mpt2sas_scsih.c
index 33723ed488e..f12e02358d6 100644
--- a/drivers/scsi/mpt2sas/mpt2sas_scsih.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_scsih.c
@@ -233,6 +233,9 @@ static struct pci_device_id scsih_pci_table[] = {
 		PCI_ANY_ID, PCI_ANY_ID },
 	{ MPI2_MFGPAGE_VENDORID_LSI, MPI2_MFGPAGE_DEVID_SAS2308_3,
 		PCI_ANY_ID, PCI_ANY_ID },
+	/* SSS6200 */
+	{ MPI2_MFGPAGE_VENDORID_LSI, MPI2_MFGPAGE_DEVID_SSS6200,
+		PCI_ANY_ID, PCI_ANY_ID },
 	{0}	/* Terminating entry */
 };
 MODULE_DEVICE_TABLE(pci, scsih_pci_table);
@@ -1256,6 +1259,7 @@ _scsih_target_alloc(struct scsi_target *starget)
 			sas_target_priv_data->handle = raid_device->handle;
 			sas_target_priv_data->sas_address = raid_device->wwid;
 			sas_target_priv_data->flags |= MPT_TARGET_FLAGS_VOLUME;
+			sas_target_priv_data->raid_device = raid_device;
 			raid_device->starget = starget;
 		}
 		spin_unlock_irqrestore(&ioc->raid_device_lock, flags);
@@ -1455,7 +1459,10 @@ static int
 _scsih_is_raid(struct device *dev)
 {
 	struct scsi_device *sdev = to_scsi_device(dev);
+	struct MPT2SAS_ADAPTER *ioc = shost_priv(sdev->host);
 
+	if (ioc->is_warpdrive)
+		return 0;
 	return (sdev->channel == RAID_CHANNEL) ? 1 : 0;
 }
 
@@ -1480,7 +1487,7 @@ _scsih_get_resync(struct device *dev)
 	    sdev->channel);
 	spin_unlock_irqrestore(&ioc->raid_device_lock, flags);
 
-	if (!raid_device)
+	if (!raid_device || ioc->is_warpdrive)
 		goto out;
 
 	if (mpt2sas_config_get_raid_volume_pg0(ioc, &mpi_reply, &vol_pg0,
@@ -1640,6 +1647,212 @@ _scsih_get_volume_capabilities(struct MPT2SAS_ADAPTER *ioc,
 
 	kfree(vol_pg0);
 }
+/**
+ * _scsih_disable_ddio - Disable direct I/O for all the volumes
+ * @ioc: per adapter object
+ */
+static void
+_scsih_disable_ddio(struct MPT2SAS_ADAPTER *ioc)
+{
+	Mpi2RaidVolPage1_t vol_pg1;
+	Mpi2ConfigReply_t mpi_reply;
+	struct _raid_device *raid_device;
+	u16 handle;
+	u16 ioc_status;
+
+	handle = 0xFFFF;
+	while (!(mpt2sas_config_get_raid_volume_pg1(ioc, &mpi_reply,
+	    &vol_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(vol_pg1.DevHandle);
+		raid_device = _scsih_raid_device_find_by_handle(ioc, handle);
+		if (raid_device)
+			raid_device->direct_io_enabled = 0;
+	}
+	return;
+}
+
+
+/**
+ * _scsih_get_num_volumes - Get number of volumes in the ioc
+ * @ioc: per adapter object
+ */
+static u8
+_scsih_get_num_volumes(struct MPT2SAS_ADAPTER *ioc)
+{
+	Mpi2RaidVolPage1_t vol_pg1;
+	Mpi2ConfigReply_t mpi_reply;
+	u16 handle;
+	u8 vol_cnt = 0;
+	u16 ioc_status;
+
+	handle = 0xFFFF;
+	while (!(mpt2sas_config_get_raid_volume_pg1(ioc, &mpi_reply,
+	    &vol_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;
+		vol_cnt++;
+		handle = le16_to_cpu(vol_pg1.DevHandle);
+	}
+	return vol_cnt;
+}
+
+
+/**
+ * _scsih_init_warpdrive_properties - Set properties for warpdrive direct I/O.
+ * @ioc: per adapter object
+ * @raid_device: the raid_device object
+ */
+static void
+_scsih_init_warpdrive_properties(struct MPT2SAS_ADAPTER *ioc,
+	struct _raid_device *raid_device)
+{
+	Mpi2RaidVolPage0_t *vol_pg0;
+	Mpi2RaidPhysDiskPage0_t pd_pg0;
+	Mpi2ConfigReply_t mpi_reply;
+	u16 sz;
+	u8 num_pds, count;
+	u64 mb = 1024 * 1024;
+	u64 tb_2 = 2 * mb * mb;
+	u64 capacity;
+	u32 stripe_sz;
+	u8 i, stripe_exp;
+
+	if (!ioc->is_warpdrive)
+		return;
+
+	if (ioc->mfg_pg10_hide_flag ==  MFG_PAGE10_EXPOSE_ALL_DISKS) {
+		printk(MPT2SAS_INFO_FMT "WarpDrive : Direct IO is disabled "
+		    "globally as drives are exposed\n", ioc->name);
+		return;
+	}
+	if (_scsih_get_num_volumes(ioc) > 1) {
+		_scsih_disable_ddio(ioc);
+		printk(MPT2SAS_INFO_FMT "WarpDrive : Direct IO is disabled "
+		    "globally as number of drives > 1\n", ioc->name);
+		return;
+	}
+	if ((mpt2sas_config_get_number_pds(ioc, raid_device->handle,
+	    &num_pds)) || !num_pds) {
+		printk(MPT2SAS_INFO_FMT "WarpDrive : Direct IO is disabled "
+		    "Failure in computing number of drives\n", ioc->name);
+		return;
+	}
+
+	sz = offsetof(Mpi2RaidVolPage0_t, PhysDisk) + (num_pds *
+	    sizeof(Mpi2RaidVol0PhysDisk_t));
+	vol_pg0 = kzalloc(sz, GFP_KERNEL);
+	if (!vol_pg0) {
+		printk(MPT2SAS_INFO_FMT "WarpDrive : Direct IO is disabled "
+		    "Memory allocation failure for RVPG0\n", ioc->name);
+		return;
+	}
+
+	if ((mpt2sas_config_get_raid_volume_pg0(ioc, &mpi_reply, vol_pg0,
+	     MPI2_RAID_VOLUME_PGAD_FORM_HANDLE, raid_device->handle, sz))) {
+		printk(MPT2SAS_INFO_FMT "WarpDrive : Direct IO is disabled "
+		    "Failure in retrieving RVPG0\n", ioc->name);
+		kfree(vol_pg0);
+		return;
+	}
+
+	/*
+	 * WARPDRIVE:If number of physical disks in a volume exceeds the max pds
+	 * assumed for WARPDRIVE, disable direct I/O
+	 */
+	if (num_pds > MPT_MAX_WARPDRIVE_PDS) {
+		printk(MPT2SAS_WARN_FMT "WarpDrive : Direct IO is disabled "
+		    "for the drive with handle(0x%04x): num_mem=%d, "
+		    "max_mem_allowed=%d\n", ioc->name, raid_device->handle,
+		    num_pds, MPT_MAX_WARPDRIVE_PDS);
+		kfree(vol_pg0);
+		return;
+	}
+	for (count = 0; count < num_pds; count++) {
+		if (mpt2sas_config_get_phys_disk_pg0(ioc, &mpi_reply,
+		    &pd_pg0, MPI2_PHYSDISK_PGAD_FORM_PHYSDISKNUM,
+		    vol_pg0->PhysDisk[count].PhysDiskNum) ||
+		    pd_pg0.DevHandle == MPT2SAS_INVALID_DEVICE_HANDLE) {
+			printk(MPT2SAS_INFO_FMT "WarpDrive : Direct IO is "
+			    "disabled for the drive with handle(0x%04x) member"
+			    "handle retrieval failed for member number=%d\n",
+			    ioc->name, raid_device->handle,
+			    vol_pg0->PhysDisk[count].PhysDiskNum);
+			goto out_error;
+		}
+		raid_device->pd_handle[count] = le16_to_cpu(pd_pg0.DevHandle);
+	}
+
+	/*
+	 * Assumption for WD: Direct I/O is not supported if the volume is
+	 * not RAID0, if the stripe size is not 64KB, if the block size is
+	 * not 512 and if the volume size is >2TB
+	 */
+	if (raid_device->volume_type != MPI2_RAID_VOL_TYPE_RAID0 ||
+	    le16_to_cpu(vol_pg0->BlockSize) != 512) {
+		printk(MPT2SAS_INFO_FMT "WarpDrive : Direct IO is disabled "
+		    "for the drive with handle(0x%04x): type=%d, "
+		    "s_sz=%uK, blk_size=%u\n", ioc->name,
+		    raid_device->handle, raid_device->volume_type,
+		    le32_to_cpu(vol_pg0->StripeSize)/2,
+		    le16_to_cpu(vol_pg0->BlockSize));
+		goto out_error;
+	}
+
+	capacity = (u64) le16_to_cpu(vol_pg0->BlockSize) *
+	    (le64_to_cpu(vol_pg0->MaxLBA) + 1);
+
+	if (capacity > tb_2) {
+		printk(MPT2SAS_INFO_FMT "WarpDrive : Direct IO is disabled "
+		"for the drive with handle(0x%04x) since drive sz > 2TB\n",
+		ioc->name, raid_device->handle);
+		goto out_error;
+	}
+
+	stripe_sz = le32_to_cpu(vol_pg0->StripeSize);
+	stripe_exp = 0;
+	for (i = 0; i < 32; i++) {
+		if (stripe_sz & 1)
+			break;
+		stripe_exp++;
+		stripe_sz >>= 1;
+	}
+	if (i == 32) {
+		printk(MPT2SAS_INFO_FMT "WarpDrive : Direct IO is disabled "
+		    "for the drive with handle(0x%04x) invalid stripe sz %uK\n",
+		    ioc->name, raid_device->handle,
+		    le32_to_cpu(vol_pg0->StripeSize)/2);
+		goto out_error;
+	}
+	raid_device->stripe_exponent = stripe_exp;
+	raid_device->direct_io_enabled = 1;
+
+	printk(MPT2SAS_INFO_FMT "WarpDrive : Direct IO is Enabled for the drive"
+	    " with handle(0x%04x)\n", ioc->name, raid_device->handle);
+	/*
+	 * WARPDRIVE: Though the following fields are not used for direct IO,
+	 * stored for future purpose:
+	 */
+	raid_device->max_lba = le64_to_cpu(vol_pg0->MaxLBA);
+	raid_device->stripe_sz = le32_to_cpu(vol_pg0->StripeSize);
+	raid_device->block_sz = le16_to_cpu(vol_pg0->BlockSize);
+
+
+	kfree(vol_pg0);
+	return;
+
+out_error:
+	raid_device->direct_io_enabled = 0;
+	for (count = 0; count < num_pds; count++)
+		raid_device->pd_handle[count] = 0;
+	kfree(vol_pg0);
+	return;
+}
 
 /**
  * _scsih_enable_tlr - setting TLR flags
@@ -1710,6 +1923,11 @@ _scsih_slave_configure(struct scsi_device *sdev)
 
 		_scsih_get_volume_capabilities(ioc, raid_device);
 
+		/*
+		 * WARPDRIVE: Initialize the required data for Direct IO
+		 */
+		_scsih_init_warpdrive_properties(ioc, raid_device);
+
 		/* RAID Queue Depth Support
 		 * IS volume = underlying qdepth of drive type, either
 		 *    MPT2SAS_SAS_QUEUE_DEPTH or MPT2SAS_SATA_QUEUE_DEPTH
@@ -1757,14 +1975,16 @@ _scsih_slave_configure(struct scsi_device *sdev)
 			break;
 		}
 
-		sdev_printk(KERN_INFO, sdev, "%s: "
-		    "handle(0x%04x), wwid(0x%016llx), pd_count(%d), type(%s)\n",
-		    r_level, raid_device->handle,
-		    (unsigned long long)raid_device->wwid,
-		    raid_device->num_pds, ds);
+		if (!ioc->hide_ir_msg)
+			sdev_printk(KERN_INFO, sdev, "%s: handle(0x%04x), "
+			    "wwid(0x%016llx), pd_count(%d), type(%s)\n",
+			    r_level, raid_device->handle,
+			    (unsigned long long)raid_device->wwid,
+			    raid_device->num_pds, ds);
 		_scsih_change_queue_depth(sdev, qdepth, SCSI_QDEPTH_DEFAULT);
 		/* raid transport support */
-		_scsih_set_level(sdev, raid_device);
+		if (!ioc->is_warpdrive)
+			_scsih_set_level(sdev, raid_device);
 		return 0;
 	}
 
@@ -2181,16 +2401,20 @@ _scsih_tm_display_info(struct MPT2SAS_ADAPTER *ioc, struct scsi_cmnd *scmd)
 	struct MPT2SAS_TARGET *priv_target = starget->hostdata;
 	struct _sas_device *sas_device = NULL;
 	unsigned long flags;
+	char *device_str = NULL;
 
 	if (!priv_target)
 		return;
+	if (ioc->hide_ir_msg)
+		device_str = "WarpDrive";
+	else
+		device_str = "volume";
 
 	scsi_print_command(scmd);
 	if (priv_target->flags & MPT_TARGET_FLAGS_VOLUME) {
-		starget_printk(KERN_INFO, starget, "volume handle(0x%04x), "
-		    "volume wwid(0x%016llx)\n",
-		    priv_target->handle,
-		    (unsigned long long)priv_target->sas_address);
+		starget_printk(KERN_INFO, starget, "%s handle(0x%04x), "
+		    "%s wwid(0x%016llx)\n", device_str, priv_target->handle,
+		    device_str, (unsigned long long)priv_target->sas_address);
 	} else {
 		spin_lock_irqsave(&ioc->sas_device_lock, flags);
 		sas_device = mpt2sas_scsih_sas_device_find_by_sas_address(ioc,
@@ -3129,6 +3353,9 @@ _scsih_check_ir_config_unhide_events(struct MPT2SAS_ADAPTER *ioc,
 	a = 0;
 	b = 0;
 
+	if (ioc->is_warpdrive)
+		return;
+
 	/* Volume Resets for Deleted or Removed */
 	element = (Mpi2EventIrConfigElement_t *)&event_data->ConfigElement[0];
 	for (i = 0; i < event_data->NumElements; i++, element++) {
@@ -3346,6 +3573,105 @@ _scsih_eedp_error_handling(struct scsi_cmnd *scmd, u16 ioc_status)
 }
 
 /**
+ * _scsih_scsi_direct_io_get - returns direct io flag
+ * @ioc: per adapter object
+ * @smid: system request message index
+ *
+ * Returns the smid stored scmd pointer.
+ */
+static inline u8
+_scsih_scsi_direct_io_get(struct MPT2SAS_ADAPTER *ioc, u16 smid)
+{
+	return ioc->scsi_lookup[smid - 1].direct_io;
+}
+
+/**
+ * _scsih_scsi_direct_io_set - sets direct io flag
+ * @ioc: per adapter object
+ * @smid: system request message index
+ * @direct_io: Zero or non-zero value to set in the direct_io flag
+ *
+ * Returns Nothing.
+ */
+static inline void
+_scsih_scsi_direct_io_set(struct MPT2SAS_ADAPTER *ioc, u16 smid, u8 direct_io)
+{
+	ioc->scsi_lookup[smid - 1].direct_io = direct_io;
+}
+
+
+/**
+ * _scsih_setup_direct_io - setup MPI request for WARPDRIVE Direct I/O
+ * @ioc: per adapter object
+ * @scmd: pointer to scsi command object
+ * @raid_device: pointer to raid device data structure
+ * @mpi_request: pointer to the SCSI_IO reqest message frame
+ * @smid: system request message index
+ *
+ * Returns nothing
+ */
+static void
+_scsih_setup_direct_io(struct MPT2SAS_ADAPTER *ioc, struct scsi_cmnd *scmd,
+	struct _raid_device *raid_device, Mpi2SCSIIORequest_t *mpi_request,
+	u16 smid)
+{
+	u32 v_lba, p_lba, stripe_off, stripe_unit, column, io_size;
+	u32 stripe_sz, stripe_exp;
+	u8 num_pds, *cdb_ptr, *tmp_ptr, *lba_ptr1, *lba_ptr2;
+	u8 cdb0 = scmd->cmnd[0];
+
+	/*
+	 * Try Direct I/O to RAID memeber disks
+	 */
+	if (cdb0 == READ_16 || cdb0 == READ_10 ||
+	    cdb0 == WRITE_16 || cdb0 == WRITE_10) {
+		cdb_ptr = mpi_request->CDB.CDB32;
+
+		if ((cdb0 < READ_16) || !(cdb_ptr[2] | cdb_ptr[3] | cdb_ptr[4]
+			| cdb_ptr[5])) {
+			io_size = scsi_bufflen(scmd) >> 9;
+			/* get virtual lba */
+			lba_ptr1 = lba_ptr2 = (cdb0 < READ_16) ? &cdb_ptr[2] :
+			    &cdb_ptr[6];
+			tmp_ptr = (u8 *)&v_lba + 3;
+			*tmp_ptr-- = *lba_ptr1++;
+			*tmp_ptr-- = *lba_ptr1++;
+			*tmp_ptr-- = *lba_ptr1++;
+			*tmp_ptr = *lba_ptr1;
+
+			if (((u64)v_lba + (u64)io_size - 1) <=
+			    (u32)raid_device->max_lba) {
+				stripe_sz = raid_device->stripe_sz;
+				stripe_exp = raid_device->stripe_exponent;
+				stripe_off = v_lba & (stripe_sz - 1);
+
+				/* Check whether IO falls within a stripe */
+				if ((stripe_off + io_size) <= stripe_sz) {
+					num_pds = raid_device->num_pds;
+					p_lba = v_lba >> stripe_exp;
+					stripe_unit = p_lba / num_pds;
+					column = p_lba % num_pds;
+					p_lba = (stripe_unit << stripe_exp) +
+					    stripe_off;
+					mpi_request->DevHandle =
+						cpu_to_le16(raid_device->
+						    pd_handle[column]);
+					tmp_ptr = (u8 *)&p_lba + 3;
+					*lba_ptr2++ = *tmp_ptr--;
+					*lba_ptr2++ = *tmp_ptr--;
+					*lba_ptr2++ = *tmp_ptr--;
+					*lba_ptr2 = *tmp_ptr;
+					/*
+					* WD: To indicate this I/O is directI/O
+					*/
+					_scsih_scsi_direct_io_set(ioc, smid, 1);
+				}
+			}
+		}
+	}
+}
+
+/**
  * _scsih_qcmd - main scsi request entry point
  * @scmd: pointer to scsi command object
  * @done: function pointer to be invoked on completion
@@ -3362,6 +3688,7 @@ _scsih_qcmd_lck(struct scsi_cmnd *scmd, void (*done)(struct scsi_cmnd *))
 	struct MPT2SAS_ADAPTER *ioc = shost_priv(scmd->device->host);
 	struct MPT2SAS_DEVICE *sas_device_priv_data;
 	struct MPT2SAS_TARGET *sas_target_priv_data;
+	struct _raid_device *raid_device;
 	Mpi2SCSIIORequest_t *mpi_request;
 	u32 mpi_control;
 	u16 smid;
@@ -3423,8 +3750,10 @@ _scsih_qcmd_lck(struct scsi_cmnd *scmd, void (*done)(struct scsi_cmnd *))
 
 	} else
 		mpi_control |= MPI2_SCSIIO_CONTROL_SIMPLEQ;
-	/* Make sure Device is not raid volume */
-	if (!_scsih_is_raid(&scmd->device->sdev_gendev) &&
+	/* Make sure Device is not raid volume.
+	 * We do not expose raid functionality to upper layer for warpdrive.
+	 */
+	if (!ioc->is_warpdrive && !_scsih_is_raid(&scmd->device->sdev_gendev) &&
 	    sas_is_tlr_enabled(scmd->device) && scmd->cmd_len != 32)
 		mpi_control |= MPI2_SCSIIO_CONTROL_TLR_ON;
 
@@ -3472,9 +3801,14 @@ _scsih_qcmd_lck(struct scsi_cmnd *scmd, void (*done)(struct scsi_cmnd *))
 		}
 	}
 
+	raid_device = sas_target_priv_data->raid_device;
+	if (raid_device && raid_device->direct_io_enabled)
+		_scsih_setup_direct_io(ioc, scmd, raid_device, mpi_request,
+		    smid);
+
 	if (likely(mpi_request->Function == MPI2_FUNCTION_SCSI_IO_REQUEST))
 		mpt2sas_base_put_smid_scsi_io(ioc, smid,
-		    sas_device_priv_data->sas_target->handle);
+		    le16_to_cpu(mpi_request->DevHandle));
 	else
 		mpt2sas_base_put_smid_default(ioc, smid);
 	return 0;
@@ -3539,10 +3873,16 @@ _scsih_scsi_ioc_info(struct MPT2SAS_ADAPTER *ioc, struct scsi_cmnd *scmd,
 	unsigned long flags;
 	struct scsi_target *starget = scmd->device->sdev_target;
 	struct MPT2SAS_TARGET *priv_target = starget->hostdata;
+	char *device_str = NULL;
 
 	if (!priv_target)
 		return;
 
+	if (ioc->hide_ir_msg)
+		device_str = "WarpDrive";
+	else
+		device_str = "volume";
+
 	if (log_info == 0x31170000)
 		return;
 
@@ -3659,8 +3999,8 @@ _scsih_scsi_ioc_info(struct MPT2SAS_ADAPTER *ioc, struct scsi_cmnd *scmd,
 	scsi_print_command(scmd);
 
 	if (priv_target->flags & MPT_TARGET_FLAGS_VOLUME) {
-		printk(MPT2SAS_WARN_FMT "\tvolume wwid(0x%016llx)\n", ioc->name,
-		    (unsigned long long)priv_target->sas_address);
+		printk(MPT2SAS_WARN_FMT "\t%s wwid(0x%016llx)\n", ioc->name,
+		    device_str, (unsigned long long)priv_target->sas_address);
 	} else {
 		spin_lock_irqsave(&ioc->sas_device_lock, flags);
 		sas_device = mpt2sas_scsih_sas_device_find_by_sas_address(ioc,
@@ -3839,6 +4179,20 @@ _scsih_io_done(struct MPT2SAS_ADAPTER *ioc, u16 smid, u8 msix_index, u32 reply)
 		scmd->result = DID_NO_CONNECT << 16;
 		goto out;
 	}
+	/*
+	 * WARPDRIVE: If direct_io is set then it is directIO,
+	 * the failed direct I/O should be redirected to volume
+	 */
+	if (_scsih_scsi_direct_io_get(ioc, smid)) {
+		_scsih_scsi_direct_io_set(ioc, smid, 0);
+		memcpy(mpi_request->CDB.CDB32, scmd->cmnd, scmd->cmd_len);
+		mpi_request->DevHandle =
+		    cpu_to_le16(sas_device_priv_data->sas_target->handle);
+		mpt2sas_base_put_smid_scsi_io(ioc, smid,
+		    sas_device_priv_data->sas_target->handle);
+		return 0;
+	}
+
 
 	/* turning off TLR */
 	scsi_state = mpi_reply->SCSIState;
@@ -3847,7 +4201,10 @@ _scsih_io_done(struct MPT2SAS_ADAPTER *ioc, u16 smid, u8 msix_index, u32 reply)
 		    le32_to_cpu(mpi_reply->ResponseInfo) & 0xFF;
 	if (!sas_device_priv_data->tlr_snoop_check) {
 		sas_device_priv_data->tlr_snoop_check++;
-	if (!_scsih_is_raid(&scmd->device->sdev_gendev) &&
+	/* Make sure Device is not raid volume.
+	 * We do not expose raid functionality to upper layer for warpdrive.
+	 */
+	if (!ioc->is_warpdrive && !_scsih_is_raid(&scmd->device->sdev_gendev) &&
 		sas_is_tlr_enabled(scmd->device) &&
 		    response_code == MPI2_SCSITASKMGMT_RSP_INVALID_FRAME) {
 			sas_disable_tlr(scmd->device);
@@ -4680,8 +5037,10 @@ _scsih_remove_device(struct MPT2SAS_ADAPTER *ioc,
 
 	_scsih_ublock_io_device(ioc, sas_device_backup.handle);
 
-	mpt2sas_transport_port_remove(ioc, sas_device_backup.sas_address,
-	    sas_device_backup.sas_address_parent);
+	if (!ioc->hide_drives)
+		mpt2sas_transport_port_remove(ioc,
+		    sas_device_backup.sas_address,
+		    sas_device_backup.sas_address_parent);
 
 	printk(MPT2SAS_INFO_FMT "removing handle(0x%04x), sas_addr"
 	    "(0x%016llx)\n", ioc->name, sas_device_backup.handle,
@@ -5412,6 +5771,7 @@ _scsih_sas_pd_hide(struct MPT2SAS_ADAPTER *ioc,
 	    &sas_device->volume_wwid);
 	set_bit(handle, ioc->pd_handles);
 	_scsih_reprobe_target(sas_device->starget, 1);
+
 }
 
 /**
@@ -5590,7 +5950,8 @@ _scsih_sas_ir_config_change_event(struct MPT2SAS_ADAPTER *ioc,
 	Mpi2EventDataIrConfigChangeList_t *event_data = fw_event->event_data;
 
 #ifdef CONFIG_SCSI_MPT2SAS_LOGGING
-	if (ioc->logging_level & MPT_DEBUG_EVENT_WORK_TASK)
+	if ((ioc->logging_level & MPT_DEBUG_EVENT_WORK_TASK)
+	    && !ioc->hide_ir_msg)
 		_scsih_sas_ir_config_change_event_debug(ioc, event_data);
 
 #endif
@@ -5613,16 +5974,20 @@ _scsih_sas_ir_config_change_event(struct MPT2SAS_ADAPTER *ioc,
 				    le16_to_cpu(element->VolDevHandle));
 			break;
 		case MPI2_EVENT_IR_CHANGE_RC_PD_CREATED:
-			_scsih_sas_pd_hide(ioc, element);
+			if (!ioc->is_warpdrive)
+				_scsih_sas_pd_hide(ioc, element);
 			break;
 		case MPI2_EVENT_IR_CHANGE_RC_PD_DELETED:
-			_scsih_sas_pd_expose(ioc, element);
+			if (!ioc->is_warpdrive)
+				_scsih_sas_pd_expose(ioc, element);
 			break;
 		case MPI2_EVENT_IR_CHANGE_RC_HIDE:
-			_scsih_sas_pd_add(ioc, element);
+			if (!ioc->is_warpdrive)
+				_scsih_sas_pd_add(ioc, element);
 			break;
 		case MPI2_EVENT_IR_CHANGE_RC_UNHIDE:
-			_scsih_sas_pd_delete(ioc, element);
+			if (!ioc->is_warpdrive)
+				_scsih_sas_pd_delete(ioc, element);
 			break;
 		}
 	}
@@ -5653,9 +6018,10 @@ _scsih_sas_ir_volume_event(struct MPT2SAS_ADAPTER *ioc,
 
 	handle = le16_to_cpu(event_data->VolDevHandle);
 	state = le32_to_cpu(event_data->NewValue);
-	dewtprintk(ioc, printk(MPT2SAS_INFO_FMT "%s: handle(0x%04x), "
-	    "old(0x%08x), new(0x%08x)\n", ioc->name, __func__,  handle,
-	    le32_to_cpu(event_data->PreviousValue), state));
+	if (!ioc->hide_ir_msg)
+		dewtprintk(ioc, printk(MPT2SAS_INFO_FMT "%s: handle(0x%04x), "
+		    "old(0x%08x), new(0x%08x)\n", ioc->name, __func__,  handle,
+		    le32_to_cpu(event_data->PreviousValue), state));
 
 	switch (state) {
 	case MPI2_RAID_VOL_STATE_MISSING:
@@ -5735,9 +6101,10 @@ _scsih_sas_ir_physical_disk_event(struct MPT2SAS_ADAPTER *ioc,
 	handle = le16_to_cpu(event_data->PhysDiskDevHandle);
 	state = le32_to_cpu(event_data->NewValue);
 
-	dewtprintk(ioc, printk(MPT2SAS_INFO_FMT "%s: handle(0x%04x), "
-	    "old(0x%08x), new(0x%08x)\n", ioc->name, __func__,  handle,
-	    le32_to_cpu(event_data->PreviousValue), state));
+	if (!ioc->hide_ir_msg)
+		dewtprintk(ioc, printk(MPT2SAS_INFO_FMT "%s: handle(0x%04x), "
+		    "old(0x%08x), new(0x%08x)\n", ioc->name, __func__,  handle,
+		    le32_to_cpu(event_data->PreviousValue), state));
 
 	switch (state) {
 	case MPI2_RAID_PD_STATE_ONLINE:
@@ -5746,7 +6113,8 @@ _scsih_sas_ir_physical_disk_event(struct MPT2SAS_ADAPTER *ioc,
 	case MPI2_RAID_PD_STATE_OPTIMAL:
 	case MPI2_RAID_PD_STATE_HOT_SPARE:
 
-		set_bit(handle, ioc->pd_handles);
+		if (!ioc->is_warpdrive)
+			set_bit(handle, ioc->pd_handles);
 
 		spin_lock_irqsave(&ioc->sas_device_lock, flags);
 		sas_device = _scsih_sas_device_find_by_handle(ioc, handle);
@@ -5850,7 +6218,8 @@ _scsih_sas_ir_operation_status_event(struct MPT2SAS_ADAPTER *ioc,
 	u16 handle;
 
 #ifdef CONFIG_SCSI_MPT2SAS_LOGGING
-	if (ioc->logging_level & MPT_DEBUG_EVENT_WORK_TASK)
+	if ((ioc->logging_level & MPT_DEBUG_EVENT_WORK_TASK)
+	    && !ioc->hide_ir_msg)
 		_scsih_sas_ir_operation_status_event_debug(ioc,
 		     event_data);
 #endif
@@ -5909,7 +6278,7 @@ static void
 _scsih_mark_responding_sas_device(struct MPT2SAS_ADAPTER *ioc, u64 sas_address,
     u16 slot, u16 handle)
 {
-	struct MPT2SAS_TARGET *sas_target_priv_data;
+	struct MPT2SAS_TARGET *sas_target_priv_data = NULL;
 	struct scsi_target *starget;
 	struct _sas_device *sas_device;
 	unsigned long flags;
@@ -5917,7 +6286,7 @@ _scsih_mark_responding_sas_device(struct MPT2SAS_ADAPTER *ioc, u64 sas_address,
 	spin_lock_irqsave(&ioc->sas_device_lock, flags);
 	list_for_each_entry(sas_device, &ioc->sas_device_list, list) {
 		if (sas_device->sas_address == sas_address &&
-		    sas_device->slot == slot && sas_device->starget) {
+		    sas_device->slot == slot) {
 			sas_device->responding = 1;
 			starget = sas_device->starget;
 			if (starget && starget->hostdata) {
@@ -5926,13 +6295,15 @@ _scsih_mark_responding_sas_device(struct MPT2SAS_ADAPTER *ioc, u64 sas_address,
 				sas_target_priv_data->deleted = 0;
 			} else
 				sas_target_priv_data = NULL;
-			starget_printk(KERN_INFO, sas_device->starget,
-			    "handle(0x%04x), sas_addr(0x%016llx), enclosure "
-			    "logical id(0x%016llx), slot(%d)\n", handle,
-			    (unsigned long long)sas_device->sas_address,
-			    (unsigned long long)
-			    sas_device->enclosure_logical_id,
-			    sas_device->slot);
+			if (starget)
+				starget_printk(KERN_INFO, starget,
+				    "handle(0x%04x), sas_addr(0x%016llx), "
+				    "enclosure logical id(0x%016llx), "
+				    "slot(%d)\n", handle,
+				    (unsigned long long)sas_device->sas_address,
+				    (unsigned long long)
+				    sas_device->enclosure_logical_id,
+				    sas_device->slot);
 			if (sas_device->handle == handle)
 				goto out;
 			printk(KERN_INFO "\thandle changed from(0x%04x)!!!\n",
@@ -6024,6 +6395,12 @@ _scsih_mark_responding_raid_device(struct MPT2SAS_ADAPTER *ioc, u64 wwid,
 			starget_printk(KERN_INFO, raid_device->starget,
 			    "handle(0x%04x), wwid(0x%016llx)\n", handle,
 			    (unsigned long long)raid_device->wwid);
+			/*
+			 * WARPDRIVE: The handles of the PDs might have changed
+			 * across the host reset so re-initialize the
+			 * required data for Direct IO
+			 */
+			_scsih_init_warpdrive_properties(ioc, raid_device);
 			if (raid_device->handle == handle)
 				goto out;
 			printk(KERN_INFO "\thandle changed from(0x%04x)!!!\n",
@@ -6085,18 +6462,20 @@ _scsih_search_responding_raid_devices(struct MPT2SAS_ADAPTER *ioc)
 	}
 
 	/* refresh the pd_handles */
-	phys_disk_num = 0xFF;
-	memset(ioc->pd_handles, 0, ioc->pd_handles_sz);
-	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);
-		set_bit(handle, ioc->pd_handles);
+	if (!ioc->is_warpdrive) {
+		phys_disk_num = 0xFF;
+		memset(ioc->pd_handles, 0, ioc->pd_handles_sz);
+		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);
+			set_bit(handle, ioc->pd_handles);
+		}
 	}
 }
 
@@ -6242,6 +6621,50 @@ _scsih_remove_unresponding_sas_devices(struct MPT2SAS_ADAPTER *ioc)
 }
 
 /**
+ * _scsih_hide_unhide_sas_devices - add/remove device to/from OS
+ * @ioc: per adapter object
+ *
+ * Return nothing.
+ */
+static void
+_scsih_hide_unhide_sas_devices(struct MPT2SAS_ADAPTER *ioc)
+{
+	struct _sas_device *sas_device, *sas_device_next;
+
+	if (!ioc->is_warpdrive || ioc->mfg_pg10_hide_flag !=
+	    MFG_PAGE10_HIDE_IF_VOL_PRESENT)
+		return;
+
+	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);
+			}
+		}
+	} 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);
+		}
+	}
+}
+
+/**
  * mpt2sas_scsih_reset_handler - reset callback handler (for scsih)
  * @ioc: per adapter object
  * @reset_phase: phase
@@ -6325,6 +6748,7 @@ _firmware_event_work(struct work_struct *work)
 			spin_unlock_irqrestore(&ioc->ioc_reset_in_progress_lock,
 			    flags);
 		_scsih_remove_unresponding_sas_devices(ioc);
+		_scsih_hide_unhide_sas_devices(ioc);
 		return;
 	}
 
@@ -6424,6 +6848,53 @@ mpt2sas_scsih_event_callback(struct MPT2SAS_ADAPTER *ioc, u8 msix_index,
 		    (Mpi2EventDataIrVolume_t *)
 		    mpi_reply->EventData);
 		break;
+	case MPI2_EVENT_LOG_ENTRY_ADDED:
+	{
+		Mpi2EventDataLogEntryAdded_t *log_entry;
+		u32 *log_code;
+
+		if (!ioc->is_warpdrive)
+			break;
+
+		log_entry = (Mpi2EventDataLogEntryAdded_t *)
+		    mpi_reply->EventData;
+		log_code = (u32 *)log_entry->LogData;
+
+		if (le16_to_cpu(log_entry->LogEntryQualifier)
+		    != MPT2_WARPDRIVE_LOGENTRY)
+			break;
+
+		switch (le32_to_cpu(*log_code)) {
+		case MPT2_WARPDRIVE_LC_SSDT:
+			printk(MPT2SAS_WARN_FMT "WarpDrive Warning: "
+			    "IO Throttling has occurred in the WarpDrive "
+			    "subsystem. Check WarpDrive documentation for "
+			    "additional details.\n", ioc->name);
+			break;
+		case MPT2_WARPDRIVE_LC_SSDLW:
+			printk(MPT2SAS_WARN_FMT "WarpDrive Warning: "
+			    "Program/Erase Cycles for the WarpDrive subsystem "
+			    "in degraded range. Check WarpDrive documentation "
+			    "for additional details.\n", ioc->name);
+			break;
+		case MPT2_WARPDRIVE_LC_SSDLF:
+			printk(MPT2SAS_ERR_FMT "WarpDrive Fatal Error: "
+			    "There are no Program/Erase Cycles for the "
+			    "WarpDrive subsystem. The storage device will be "
+			    "in read-only mode. Check WarpDrive documentation "
+			    "for additional details.\n", ioc->name);
+			break;
+		case MPT2_WARPDRIVE_LC_BRMF:
+			printk(MPT2SAS_ERR_FMT "WarpDrive Fatal Error: "
+			    "The Backup Rail Monitor has failed on the "
+			    "WarpDrive subsystem. Check WarpDrive "
+			    "documentation for additional details.\n",
+			    ioc->name);
+			break;
+		}
+
+		break;
+	}
 	case MPI2_EVENT_SAS_DEVICE_STATUS_CHANGE:
 	case MPI2_EVENT_IR_OPERATION_STATUS:
 	case MPI2_EVENT_SAS_DISCOVERY:
@@ -6582,7 +7053,8 @@ _scsih_ir_shutdown(struct MPT2SAS_ADAPTER *ioc)
 	mpi_request->Function = MPI2_FUNCTION_RAID_ACTION;
 	mpi_request->Action = MPI2_RAID_ACTION_SYSTEM_SHUTDOWN_INITIATED;
 
-	printk(MPT2SAS_INFO_FMT "IR shutdown (sending)\n", ioc->name);
+	if (!ioc->hide_ir_msg)
+		printk(MPT2SAS_INFO_FMT "IR shutdown (sending)\n", ioc->name);
 	init_completion(&ioc->scsih_cmds.done);
 	mpt2sas_base_put_smid_default(ioc, smid);
 	wait_for_completion_timeout(&ioc->scsih_cmds.done, 10*HZ);
@@ -6596,10 +7068,11 @@ _scsih_ir_shutdown(struct MPT2SAS_ADAPTER *ioc)
 	if (ioc->scsih_cmds.status & MPT2_CMD_REPLY_VALID) {
 		mpi_reply = ioc->scsih_cmds.reply;
 
-		printk(MPT2SAS_INFO_FMT "IR shutdown (complete): "
-		    "ioc_status(0x%04x), loginfo(0x%08x)\n",
-		    ioc->name, le16_to_cpu(mpi_reply->IOCStatus),
-		    le32_to_cpu(mpi_reply->IOCLogInfo));
+		if (!ioc->hide_ir_msg)
+			printk(MPT2SAS_INFO_FMT "IR shutdown (complete): "
+			    "ioc_status(0x%04x), loginfo(0x%08x)\n",
+			    ioc->name, le16_to_cpu(mpi_reply->IOCStatus),
+			    le32_to_cpu(mpi_reply->IOCLogInfo));
 	}
 
  out:
@@ -6758,6 +7231,9 @@ _scsih_probe_boot_devices(struct MPT2SAS_ADAPTER *ioc)
 		spin_lock_irqsave(&ioc->sas_device_lock, flags);
 		list_move_tail(&sas_device->list, &ioc->sas_device_list);
 		spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
+
+		if (ioc->hide_drives)
+			return;
 		if (!mpt2sas_transport_port_add(ioc, sas_device->handle,
 		    sas_device->sas_address_parent)) {
 			_scsih_sas_device_remove(ioc, sas_device);
@@ -6811,6 +7287,9 @@ _scsih_probe_sas(struct MPT2SAS_ADAPTER *ioc)
 		list_move_tail(&sas_device->list, &ioc->sas_device_list);
 		spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
 
+		if (ioc->hide_drives)
+			continue;
+
 		if (!mpt2sas_transport_port_add(ioc, sas_device->handle,
 		    sas_device->sas_address_parent)) {
 			_scsih_sas_device_remove(ioc, sas_device);
@@ -6881,6 +7360,11 @@ _scsih_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	ioc->id = mpt_ids++;
 	sprintf(ioc->name, "%s%d", MPT2SAS_DRIVER_NAME, ioc->id);
 	ioc->pdev = pdev;
+	if (id->device == MPI2_MFGPAGE_DEVID_SSS6200) {
+		ioc->is_warpdrive = 1;
+		ioc->hide_ir_msg = 1;
+	} else
+		ioc->mfg_pg10_hide_flag = MFG_PAGE10_EXPOSE_ALL_DISKS;
 	ioc->scsi_io_cb_idx = scsi_io_cb_idx;
 	ioc->tm_cb_idx = tm_cb_idx;
 	ioc->ctl_cb_idx = ctl_cb_idx;
@@ -6946,6 +7430,20 @@ _scsih_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	}
 
 	ioc->wait_for_port_enable_to_complete = 0;
+	if (ioc->is_warpdrive) {
+		if (ioc->mfg_pg10_hide_flag ==  MFG_PAGE10_EXPOSE_ALL_DISKS)
+			ioc->hide_drives = 0;
+		else if (ioc->mfg_pg10_hide_flag ==  MFG_PAGE10_HIDE_ALL_DISKS)
+			ioc->hide_drives = 1;
+		else {
+			if (_scsih_get_num_volumes(ioc))
+				ioc->hide_drives = 1;
+			else
+				ioc->hide_drives = 0;
+		}
+	} else
+		ioc->hide_drives = 0;
+
 	_scsih_probe_devices(ioc);
 	return 0;