1 files changed, 556 insertions, 58 deletions

diff --git a/drivers/scsi/mpt2sas/mpt2sas_scsih.c b/drivers/scsi/mpt2sas/mpt2sas_scsih.c
index 33723ed488eb..f12e02358d6d 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;