drivers/scsi/mpt3sas/mpt3sas_warpdrive.c - arm/linux - Git at Google

 /*
  * Scsi Host Layer for MPT (Message Passing Technology) based controllers
  *
  * Copyright (C) 2012-2014  LSI Corporation
  * Copyright (C) 2013-2015 Avago Technologies
  *  (mailto: MPT-FusionLinux.pdl@avagotech.com)
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
  * as published by the Free Software Foundation; either version 2
  * of the License, or (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * NO WARRANTY
  * THE PROGRAM IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OR
  * CONDITIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED INCLUDING, WITHOUT
  * LIMITATION, ANY WARRANTIES OR CONDITIONS OF TITLE, NON-INFRINGEMENT,
  * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Each Recipient is
  * solely responsible for determining the appropriateness of using and
  * distributing the Program and assumes all risks associated with its
  * exercise of rights under this Agreement, including but not limited to
  * the risks and costs of program errors, damage to or loss of data,
  * programs or equipment, and unavailability or interruption of operations.

  * DISCLAIMER OF LIABILITY
  * NEITHER RECIPIENT NOR ANY CONTRIBUTORS SHALL HAVE ANY LIABILITY FOR ANY
  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING WITHOUT LIMITATION LOST PROFITS), HOWEVER CAUSED AND
  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
  * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
  * USE OR DISTRIBUTION OF THE PROGRAM OR THE EXERCISE OF ANY RIGHTS GRANTED
  * HEREUNDER, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES

  * You should have received a copy of the GNU General Public License
  * along with this program.
  */
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/errno.h>
 #include <linux/types.h>
 #include <asm/unaligned.h>

 #include "mpt3sas_base.h"

 /**
  * _warpdrive_disable_ddio - Disable direct I/O for all the volumes
  * @ioc: per adapter object
  */
 static void
 _warpdrive_disable_ddio(struct MPT3SAS_ADAPTER *ioc)
 {
 	Mpi2RaidVolPage1_t vol_pg1;
 	Mpi2ConfigReply_t mpi_reply;
 	struct _raid_device *raid_device;
 	u16 handle;
 	u16 ioc_status;
 	unsigned long flags;

 	handle = 0xFFFF;
 	while (!(mpt3sas_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);
 		spin_lock_irqsave(&ioc->raid_device_lock, flags);
 		raid_device = mpt3sas_raid_device_find_by_handle(ioc, handle);
 		if (raid_device)
 			raid_device->direct_io_enabled = 0;
 		spin_unlock_irqrestore(&ioc->raid_device_lock, flags);
 	}
 	return;
 }


 /**
  * mpt3sas_get_num_volumes - Get number of volumes in the ioc
  * @ioc: per adapter object
  */
 u8
 mpt3sas_get_num_volumes(struct MPT3SAS_ADAPTER *ioc)
 {
 	Mpi2RaidVolPage1_t vol_pg1;
 	Mpi2ConfigReply_t mpi_reply;
 	u16 handle;
 	u8 vol_cnt = 0;
 	u16 ioc_status;

 	handle = 0xFFFF;
 	while (!(mpt3sas_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;
 }


 /**
  * mpt3sas_init_warpdrive_properties - Set properties for warpdrive direct I/O.
  * @ioc: per adapter object
  * @raid_device: the raid_device object
  */
 void
 mpt3sas_init_warpdrive_properties(struct MPT3SAS_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;
 	unsigned long stripe_sz, block_sz;
 	u8 stripe_exp, block_exp;
 	u64 dev_max_lba;

 	if (!ioc->is_warpdrive)
 		return;

 	if (ioc->mfg_pg10_hide_flag ==  MFG_PAGE10_EXPOSE_ALL_DISKS) {
 		pr_info(MPT3SAS_FMT "WarpDrive : Direct IO is disabled "
 		    "globally as drives are exposed\n", ioc->name);
 		return;
 	}
 	if (mpt3sas_get_num_volumes(ioc) > 1) {
 		_warpdrive_disable_ddio(ioc);
 		pr_info(MPT3SAS_FMT "WarpDrive : Direct IO is disabled "
 		    "globally as number of drives > 1\n", ioc->name);
 		return;
 	}
 	if ((mpt3sas_config_get_number_pds(ioc, raid_device->handle,
 	    &num_pds)) || !num_pds) {
 		pr_info(MPT3SAS_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) {
 		pr_info(MPT3SAS_FMT "WarpDrive : Direct IO is disabled "
 		    "Memory allocation failure for RVPG0\n", ioc->name);
 		return;
 	}

 	if ((mpt3sas_config_get_raid_volume_pg0(ioc, &mpi_reply, vol_pg0,
 	     MPI2_RAID_VOLUME_PGAD_FORM_HANDLE, raid_device->handle, sz))) {
 		pr_info(MPT3SAS_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) {
 		pr_warn(MPT3SAS_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 (mpt3sas_config_get_phys_disk_pg0(ioc, &mpi_reply,
 		    &pd_pg0, MPI2_PHYSDISK_PGAD_FORM_PHYSDISKNUM,
 		    vol_pg0->PhysDisk[count].PhysDiskNum) ||
 		    pd_pg0.DevHandle == MPT3SAS_INVALID_DEVICE_HANDLE) {
 			pr_info(MPT3SAS_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;
 		}
 		/* Disable direct I/O if member drive lba exceeds 4 bytes */
 		dev_max_lba = le64_to_cpu(pd_pg0.DeviceMaxLBA);
 		if (dev_max_lba >> 32) {
 			pr_info(MPT3SAS_FMT "WarpDrive : Direct IO is "
 			    "disabled for the drive with handle(0x%04x) member"
 			    " handle (0x%04x) unsupported max lba 0x%016llx\n",
 			    ioc->name, raid_device->handle,
 			    le16_to_cpu(pd_pg0.DevHandle),
 			    (unsigned long long)dev_max_lba);
 			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 (raid_device->volume_type != MPI2_RAID_VOL_TYPE_RAID0) {
 		pr_info(MPT3SAS_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) *
 		    le16_to_cpu(vol_pg0->BlockSize)) / 1024,
 		    le16_to_cpu(vol_pg0->BlockSize));
 		goto out_error;
 	}

 	stripe_sz = le32_to_cpu(vol_pg0->StripeSize);
 	stripe_exp = find_first_bit(&stripe_sz, 32);
 	if (stripe_exp == 32) {
 		pr_info(MPT3SAS_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) *
 		    le16_to_cpu(vol_pg0->BlockSize)) / 1024);
 		goto out_error;
 	}
 	raid_device->stripe_exponent = stripe_exp;
 	block_sz = le16_to_cpu(vol_pg0->BlockSize);
 	block_exp = find_first_bit(&block_sz, 16);
 	if (block_exp == 16) {
 		pr_info(MPT3SAS_FMT "WarpDrive : Direct IO is disabled "
 		    "for the drive with handle(0x%04x) invalid block sz %u\n",
 		    ioc->name, raid_device->handle,
 		    le16_to_cpu(vol_pg0->BlockSize));
 		goto out_error;
 	}
 	raid_device->block_exponent = block_exp;
 	raid_device->direct_io_enabled = 1;

 	pr_info(MPT3SAS_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;
 }

 /**
  * mpt3sas_scsi_direct_io_get - returns direct io flag
  * @ioc: per adapter object
  * @smid: system request message index
  *
  * Returns the smid stored scmd pointer.
  */
 inline u8
 mpt3sas_scsi_direct_io_get(struct MPT3SAS_ADAPTER *ioc, u16 smid)
 {
 	return ioc->scsi_lookup[smid - 1].direct_io;
 }

 /**
  * mpt3sas_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.
  */
 inline void
 mpt3sas_scsi_direct_io_set(struct MPT3SAS_ADAPTER *ioc, u16 smid, u8 direct_io)
 {
 	ioc->scsi_lookup[smid - 1].direct_io = direct_io;
 }

 /**
  * mpt3sas_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
  */
 void
 mpt3sas_setup_direct_io(struct MPT3SAS_ADAPTER *ioc, struct scsi_cmnd *scmd,
 	struct _raid_device *raid_device, Mpi25SCSIIORequest_t *mpi_request,
 	u16 smid)
 {
 	sector_t v_lba, p_lba, stripe_off, column, io_size;
 	u32 stripe_sz, stripe_exp;
 	u8 num_pds, cmd = scmd->cmnd[0];

 	if (cmd != READ_10 && cmd != WRITE_10 &&
 	    cmd != READ_16 && cmd != WRITE_16)
 		return;

 	if (cmd == READ_10 || cmd == WRITE_10)
 		v_lba = get_unaligned_be32(&mpi_request->CDB.CDB32[2]);
 	else
 		v_lba = get_unaligned_be64(&mpi_request->CDB.CDB32[2]);

 	io_size = scsi_bufflen(scmd) >> raid_device->block_exponent;

 	if (v_lba + io_size - 1 > raid_device->max_lba)
 		return;

 	stripe_sz = raid_device->stripe_sz;
 	stripe_exp = raid_device->stripe_exponent;
 	stripe_off = v_lba & (stripe_sz - 1);

 	/* Return unless IO falls within a stripe */
 	if (stripe_off + io_size > stripe_sz)
 		return;

 	num_pds = raid_device->num_pds;
 	p_lba = v_lba >> stripe_exp;
 	column = sector_div(p_lba, num_pds);
 	p_lba = (p_lba << stripe_exp) + stripe_off;
 	mpi_request->DevHandle = cpu_to_le16(raid_device->pd_handle[column]);

 	if (cmd == READ_10 || cmd == WRITE_10)
 		put_unaligned_be32(lower_32_bits(p_lba),
 				   &mpi_request->CDB.CDB32[2]);
 	else
 		put_unaligned_be64(p_lba, &mpi_request->CDB.CDB32[2]);

 	mpt3sas_scsi_direct_io_set(ioc, smid, 1);
 }
	/*
	* Scsi Host Layer for MPT (Message Passing Technology) based controllers
	*
	* Copyright (C) 2012-2014 LSI Corporation
	* Copyright (C) 2013-2015 Avago Technologies
	* (mailto: MPT-FusionLinux.pdl@avagotech.com)
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public License
	* as published by the Free Software Foundation; either version 2
	* of the License, or (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* NO WARRANTY
	* THE PROGRAM IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OR
	* CONDITIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED INCLUDING, WITHOUT
	* LIMITATION, ANY WARRANTIES OR CONDITIONS OF TITLE, NON-INFRINGEMENT,
	* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Each Recipient is
	* solely responsible for determining the appropriateness of using and
	* distributing the Program and assumes all risks associated with its
	* exercise of rights under this Agreement, including but not limited to
	* the risks and costs of program errors, damage to or loss of data,
	* programs or equipment, and unavailability or interruption of operations.

	* DISCLAIMER OF LIABILITY
	* NEITHER RECIPIENT NOR ANY CONTRIBUTORS SHALL HAVE ANY LIABILITY FOR ANY
	* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	* DAMAGES (INCLUDING WITHOUT LIMITATION LOST PROFITS), HOWEVER CAUSED AND
	* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
	* TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
	* USE OR DISTRIBUTION OF THE PROGRAM OR THE EXERCISE OF ANY RIGHTS GRANTED
	* HEREUNDER, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES

	* You should have received a copy of the GNU General Public License
	* along with this program.
	*/
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/errno.h>
	#include <linux/types.h>
	#include <asm/unaligned.h>

	#include "mpt3sas_base.h"

	/**
	* _warpdrive_disable_ddio - Disable direct I/O for all the volumes
	* @ioc: per adapter object
	*/
	static void
	_warpdrive_disable_ddio(struct MPT3SAS_ADAPTER *ioc)
	{
	Mpi2RaidVolPage1_t vol_pg1;
	Mpi2ConfigReply_t mpi_reply;
	struct _raid_device *raid_device;
	u16 handle;
	u16 ioc_status;
	unsigned long flags;

	handle = 0xFFFF;
	while (!(mpt3sas_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);
	spin_lock_irqsave(&ioc->raid_device_lock, flags);
	raid_device = mpt3sas_raid_device_find_by_handle(ioc, handle);
	if (raid_device)
	raid_device->direct_io_enabled = 0;
	spin_unlock_irqrestore(&ioc->raid_device_lock, flags);
	}
	return;
	}


	/**
	* mpt3sas_get_num_volumes - Get number of volumes in the ioc
	* @ioc: per adapter object
	*/
	u8
	mpt3sas_get_num_volumes(struct MPT3SAS_ADAPTER *ioc)
	{
	Mpi2RaidVolPage1_t vol_pg1;
	Mpi2ConfigReply_t mpi_reply;
	u16 handle;
	u8 vol_cnt = 0;
	u16 ioc_status;

	handle = 0xFFFF;
	while (!(mpt3sas_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;
	}


	/**
	* mpt3sas_init_warpdrive_properties - Set properties for warpdrive direct I/O.
	* @ioc: per adapter object
	* @raid_device: the raid_device object
	*/
	void
	mpt3sas_init_warpdrive_properties(struct MPT3SAS_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;
	unsigned long stripe_sz, block_sz;
	u8 stripe_exp, block_exp;
	u64 dev_max_lba;

	if (!ioc->is_warpdrive)
	return;

	if (ioc->mfg_pg10_hide_flag == MFG_PAGE10_EXPOSE_ALL_DISKS) {
	pr_info(MPT3SAS_FMT "WarpDrive : Direct IO is disabled "
	"globally as drives are exposed\n", ioc->name);
	return;
	}
	if (mpt3sas_get_num_volumes(ioc) > 1) {
	_warpdrive_disable_ddio(ioc);
	pr_info(MPT3SAS_FMT "WarpDrive : Direct IO is disabled "
	"globally as number of drives > 1\n", ioc->name);
	return;
	}
	if ((mpt3sas_config_get_number_pds(ioc, raid_device->handle,
	&num_pds)) \|\| !num_pds) {
	pr_info(MPT3SAS_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) {
	pr_info(MPT3SAS_FMT "WarpDrive : Direct IO is disabled "
	"Memory allocation failure for RVPG0\n", ioc->name);
	return;
	}

	if ((mpt3sas_config_get_raid_volume_pg0(ioc, &mpi_reply, vol_pg0,
	MPI2_RAID_VOLUME_PGAD_FORM_HANDLE, raid_device->handle, sz))) {
	pr_info(MPT3SAS_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) {
	pr_warn(MPT3SAS_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 (mpt3sas_config_get_phys_disk_pg0(ioc, &mpi_reply,
	&pd_pg0, MPI2_PHYSDISK_PGAD_FORM_PHYSDISKNUM,
	vol_pg0->PhysDisk[count].PhysDiskNum) \|\|
	pd_pg0.DevHandle == MPT3SAS_INVALID_DEVICE_HANDLE) {
	pr_info(MPT3SAS_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;
	}
	/* Disable direct I/O if member drive lba exceeds 4 bytes */
	dev_max_lba = le64_to_cpu(pd_pg0.DeviceMaxLBA);
	if (dev_max_lba >> 32) {
	pr_info(MPT3SAS_FMT "WarpDrive : Direct IO is "
	"disabled for the drive with handle(0x%04x) member"
	" handle (0x%04x) unsupported max lba 0x%016llx\n",
	ioc->name, raid_device->handle,
	le16_to_cpu(pd_pg0.DevHandle),
	(unsigned long long)dev_max_lba);
	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 (raid_device->volume_type != MPI2_RAID_VOL_TYPE_RAID0) {
	pr_info(MPT3SAS_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) *
	le16_to_cpu(vol_pg0->BlockSize)) / 1024,
	le16_to_cpu(vol_pg0->BlockSize));
	goto out_error;
	}

	stripe_sz = le32_to_cpu(vol_pg0->StripeSize);
	stripe_exp = find_first_bit(&stripe_sz, 32);
	if (stripe_exp == 32) {
	pr_info(MPT3SAS_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) *
	le16_to_cpu(vol_pg0->BlockSize)) / 1024);
	goto out_error;
	}
	raid_device->stripe_exponent = stripe_exp;
	block_sz = le16_to_cpu(vol_pg0->BlockSize);
	block_exp = find_first_bit(&block_sz, 16);
	if (block_exp == 16) {
	pr_info(MPT3SAS_FMT "WarpDrive : Direct IO is disabled "
	"for the drive with handle(0x%04x) invalid block sz %u\n",
	ioc->name, raid_device->handle,
	le16_to_cpu(vol_pg0->BlockSize));
	goto out_error;
	}
	raid_device->block_exponent = block_exp;
	raid_device->direct_io_enabled = 1;

	pr_info(MPT3SAS_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;
	}

	/**
	* mpt3sas_scsi_direct_io_get - returns direct io flag
	* @ioc: per adapter object
	* @smid: system request message index
	*
	* Returns the smid stored scmd pointer.
	*/
	inline u8
	mpt3sas_scsi_direct_io_get(struct MPT3SAS_ADAPTER *ioc, u16 smid)
	{
	return ioc->scsi_lookup[smid - 1].direct_io;
	}

	/**
	* mpt3sas_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.
	*/
	inline void
	mpt3sas_scsi_direct_io_set(struct MPT3SAS_ADAPTER *ioc, u16 smid, u8 direct_io)
	{
	ioc->scsi_lookup[smid - 1].direct_io = direct_io;
	}

	/**
	* mpt3sas_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
	*/
	void
	mpt3sas_setup_direct_io(struct MPT3SAS_ADAPTER ioc, struct scsi_cmnd scmd,
	struct _raid_device raid_device, Mpi25SCSIIORequest_t mpi_request,
	u16 smid)
	{
	sector_t v_lba, p_lba, stripe_off, column, io_size;
	u32 stripe_sz, stripe_exp;
	u8 num_pds, cmd = scmd->cmnd[0];

	if (cmd != READ_10 && cmd != WRITE_10 &&
	cmd != READ_16 && cmd != WRITE_16)
	return;

	if (cmd == READ_10 \|\| cmd == WRITE_10)
	v_lba = get_unaligned_be32(&mpi_request->CDB.CDB32[2]);
	else
	v_lba = get_unaligned_be64(&mpi_request->CDB.CDB32[2]);

	io_size = scsi_bufflen(scmd) >> raid_device->block_exponent;

	if (v_lba + io_size - 1 > raid_device->max_lba)
	return;

	stripe_sz = raid_device->stripe_sz;
	stripe_exp = raid_device->stripe_exponent;
	stripe_off = v_lba & (stripe_sz - 1);

	/* Return unless IO falls within a stripe */
	if (stripe_off + io_size > stripe_sz)
	return;

	num_pds = raid_device->num_pds;
	p_lba = v_lba >> stripe_exp;
	column = sector_div(p_lba, num_pds);
	p_lba = (p_lba << stripe_exp) + stripe_off;
	mpi_request->DevHandle = cpu_to_le16(raid_device->pd_handle[column]);

	if (cmd == READ_10 \|\| cmd == WRITE_10)
	put_unaligned_be32(lower_32_bits(p_lba),
	&mpi_request->CDB.CDB32[2]);
	else
	put_unaligned_be64(p_lba, &mpi_request->CDB.CDB32[2]);

	mpt3sas_scsi_direct_io_set(ioc, smid, 1);
	}