diff options
Diffstat (limited to 'drivers/scsi/mpt3sas/mpt3sas_warpdrive.c')
| -rw-r--r-- | drivers/scsi/mpt3sas/mpt3sas_warpdrive.c | 299 |
1 files changed, 299 insertions, 0 deletions
diff --git a/drivers/scsi/mpt3sas/mpt3sas_warpdrive.c b/drivers/scsi/mpt3sas/mpt3sas_warpdrive.c new file mode 100644 index 000000000..cc07ba41f --- /dev/null +++ b/drivers/scsi/mpt3sas/mpt3sas_warpdrive.c @@ -0,0 +1,299 @@ +/* + * 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 = offsetof(Mpi2RaidVolPage0_t, PhysDisk) + (num_pds * + sizeof(Mpi2RaidVol0PhysDisk_t)); + 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; +} |