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/*
* 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) {
ioc_info(ioc, "WarpDrive : Direct IO is disabled globally as drives are exposed\n");
return;
}
if (mpt3sas_get_num_volumes(ioc) > 1) {
_warpdrive_disable_ddio(ioc);
ioc_info(ioc, "WarpDrive : Direct IO is disabled globally as number of drives > 1\n");
return;
}
if ((mpt3sas_config_get_number_pds(ioc, raid_device->handle,
&num_pds)) || !num_pds) {
ioc_info(ioc, "WarpDrive : Direct IO is disabled Failure in computing number of drives\n");
return;
}
sz = struct_size(vol_pg0, PhysDisk, num_pds);
vol_pg0 = kzalloc(sz, GFP_KERNEL);
if (!vol_pg0) {
ioc_info(ioc, "WarpDrive : Direct IO is disabled Memory allocation failure for RVPG0\n");
return;
}
if ((mpt3sas_config_get_raid_volume_pg0(ioc, &mpi_reply, vol_pg0,
MPI2_RAID_VOLUME_PGAD_FORM_HANDLE, raid_device->handle, sz))) {
ioc_info(ioc, "WarpDrive : Direct IO is disabled Failure in retrieving RVPG0\n");
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) {
ioc_warn(ioc, "WarpDrive : Direct IO is disabled for the drive with handle(0x%04x): num_mem=%d, max_mem_allowed=%d\n",
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) ||
le16_to_cpu(pd_pg0.DevHandle) ==
MPT3SAS_INVALID_DEVICE_HANDLE) {
ioc_info(ioc, "WarpDrive : Direct IO is disabled for the drive with handle(0x%04x) member handle retrieval failed for member number=%d\n",
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) {
ioc_info(ioc, "WarpDrive : Direct IO is disabled for the drive with handle(0x%04x) member handle (0x%04x) unsupported max lba 0x%016llx\n",
raid_device->handle,
le16_to_cpu(pd_pg0.DevHandle),
(u64)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) {
ioc_info(ioc, "WarpDrive : Direct IO is disabled for the drive with handle(0x%04x): type=%d, s_sz=%uK, blk_size=%u\n",
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) {
ioc_info(ioc, "WarpDrive : Direct IO is disabled for the drive with handle(0x%04x) invalid stripe sz %uK\n",
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) {
ioc_info(ioc, "WarpDrive : Direct IO is disabled for the drive with handle(0x%04x) invalid block sz %u\n",
raid_device->handle, le16_to_cpu(vol_pg0->BlockSize));
goto out_error;
}
raid_device->block_exponent = block_exp;
raid_device->direct_io_enabled = 1;
ioc_info(ioc, "WarpDrive : Direct IO is Enabled for the drive with handle(0x%04x)\n",
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_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
*/
void
mpt3sas_setup_direct_io(struct MPT3SAS_ADAPTER *ioc, struct scsi_cmnd *scmd,
struct _raid_device *raid_device, Mpi25SCSIIORequest_t *mpi_request)
{
sector_t v_lba, p_lba, stripe_off, column, io_size;
u32 stripe_sz, stripe_exp;
u8 num_pds, cmd = scmd->cmnd[0];
struct scsiio_tracker *st = scsi_cmd_priv(scmd);
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]);
st->direct_io = 1;
}
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