root/drivers/scsi/mpt3sas/mpt3sas_warpdrive.c

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DEFINITIONS

This source file includes following definitions.
  1. _warpdrive_disable_ddio
  2. mpt3sas_get_num_volumes
  3. mpt3sas_init_warpdrive_properties
  4. mpt3sas_setup_direct_io
   1 /*
   2  * Scsi Host Layer for MPT (Message Passing Technology) based controllers
   3  *
   4  * Copyright (C) 2012-2014  LSI Corporation
   5  * Copyright (C) 2013-2015 Avago Technologies
   6  *  (mailto: MPT-FusionLinux.pdl@avagotech.com)
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License
  10  * as published by the Free Software Foundation; either version 2
  11  * of the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * NO WARRANTY
  19  * THE PROGRAM IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OR
  20  * CONDITIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED INCLUDING, WITHOUT
  21  * LIMITATION, ANY WARRANTIES OR CONDITIONS OF TITLE, NON-INFRINGEMENT,
  22  * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Each Recipient is
  23  * solely responsible for determining the appropriateness of using and
  24  * distributing the Program and assumes all risks associated with its
  25  * exercise of rights under this Agreement, including but not limited to
  26  * the risks and costs of program errors, damage to or loss of data,
  27  * programs or equipment, and unavailability or interruption of operations.
  28 
  29  * DISCLAIMER OF LIABILITY
  30  * NEITHER RECIPIENT NOR ANY CONTRIBUTORS SHALL HAVE ANY LIABILITY FOR ANY
  31  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  32  * DAMAGES (INCLUDING WITHOUT LIMITATION LOST PROFITS), HOWEVER CAUSED AND
  33  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
  34  * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
  35  * USE OR DISTRIBUTION OF THE PROGRAM OR THE EXERCISE OF ANY RIGHTS GRANTED
  36  * HEREUNDER, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES
  37 
  38  * You should have received a copy of the GNU General Public License
  39  * along with this program.
  40  */
  41 #include <linux/kernel.h>
  42 #include <linux/module.h>
  43 #include <linux/errno.h>
  44 #include <linux/types.h>
  45 #include <asm/unaligned.h>
  46 
  47 #include "mpt3sas_base.h"
  48 
  49 /**
  50  * _warpdrive_disable_ddio - Disable direct I/O for all the volumes
  51  * @ioc: per adapter object
  52  */
  53 static void
  54 _warpdrive_disable_ddio(struct MPT3SAS_ADAPTER *ioc)
  55 {
  56         Mpi2RaidVolPage1_t vol_pg1;
  57         Mpi2ConfigReply_t mpi_reply;
  58         struct _raid_device *raid_device;
  59         u16 handle;
  60         u16 ioc_status;
  61         unsigned long flags;
  62 
  63         handle = 0xFFFF;
  64         while (!(mpt3sas_config_get_raid_volume_pg1(ioc, &mpi_reply,
  65             &vol_pg1, MPI2_RAID_VOLUME_PGAD_FORM_GET_NEXT_HANDLE, handle))) {
  66                 ioc_status = le16_to_cpu(mpi_reply.IOCStatus) &
  67                     MPI2_IOCSTATUS_MASK;
  68                 if (ioc_status == MPI2_IOCSTATUS_CONFIG_INVALID_PAGE)
  69                         break;
  70                 handle = le16_to_cpu(vol_pg1.DevHandle);
  71                 spin_lock_irqsave(&ioc->raid_device_lock, flags);
  72                 raid_device = mpt3sas_raid_device_find_by_handle(ioc, handle);
  73                 if (raid_device)
  74                         raid_device->direct_io_enabled = 0;
  75                 spin_unlock_irqrestore(&ioc->raid_device_lock, flags);
  76         }
  77         return;
  78 }
  79 
  80 
  81 /**
  82  * mpt3sas_get_num_volumes - Get number of volumes in the ioc
  83  * @ioc: per adapter object
  84  */
  85 u8
  86 mpt3sas_get_num_volumes(struct MPT3SAS_ADAPTER *ioc)
  87 {
  88         Mpi2RaidVolPage1_t vol_pg1;
  89         Mpi2ConfigReply_t mpi_reply;
  90         u16 handle;
  91         u8 vol_cnt = 0;
  92         u16 ioc_status;
  93 
  94         handle = 0xFFFF;
  95         while (!(mpt3sas_config_get_raid_volume_pg1(ioc, &mpi_reply,
  96             &vol_pg1, MPI2_RAID_VOLUME_PGAD_FORM_GET_NEXT_HANDLE, handle))) {
  97                 ioc_status = le16_to_cpu(mpi_reply.IOCStatus) &
  98                     MPI2_IOCSTATUS_MASK;
  99                 if (ioc_status == MPI2_IOCSTATUS_CONFIG_INVALID_PAGE)
 100                         break;
 101                 vol_cnt++;
 102                 handle = le16_to_cpu(vol_pg1.DevHandle);
 103         }
 104         return vol_cnt;
 105 }
 106 
 107 
 108 /**
 109  * mpt3sas_init_warpdrive_properties - Set properties for warpdrive direct I/O.
 110  * @ioc: per adapter object
 111  * @raid_device: the raid_device object
 112  */
 113 void
 114 mpt3sas_init_warpdrive_properties(struct MPT3SAS_ADAPTER *ioc,
 115         struct _raid_device *raid_device)
 116 {
 117         Mpi2RaidVolPage0_t *vol_pg0;
 118         Mpi2RaidPhysDiskPage0_t pd_pg0;
 119         Mpi2ConfigReply_t mpi_reply;
 120         u16 sz;
 121         u8 num_pds, count;
 122         unsigned long stripe_sz, block_sz;
 123         u8 stripe_exp, block_exp;
 124         u64 dev_max_lba;
 125 
 126         if (!ioc->is_warpdrive)
 127                 return;
 128 
 129         if (ioc->mfg_pg10_hide_flag ==  MFG_PAGE10_EXPOSE_ALL_DISKS) {
 130                 ioc_info(ioc, "WarpDrive : Direct IO is disabled globally as drives are exposed\n");
 131                 return;
 132         }
 133         if (mpt3sas_get_num_volumes(ioc) > 1) {
 134                 _warpdrive_disable_ddio(ioc);
 135                 ioc_info(ioc, "WarpDrive : Direct IO is disabled globally as number of drives > 1\n");
 136                 return;
 137         }
 138         if ((mpt3sas_config_get_number_pds(ioc, raid_device->handle,
 139             &num_pds)) || !num_pds) {
 140                 ioc_info(ioc, "WarpDrive : Direct IO is disabled Failure in computing number of drives\n");
 141                 return;
 142         }
 143 
 144         sz = offsetof(Mpi2RaidVolPage0_t, PhysDisk) + (num_pds *
 145             sizeof(Mpi2RaidVol0PhysDisk_t));
 146         vol_pg0 = kzalloc(sz, GFP_KERNEL);
 147         if (!vol_pg0) {
 148                 ioc_info(ioc, "WarpDrive : Direct IO is disabled Memory allocation failure for RVPG0\n");
 149                 return;
 150         }
 151 
 152         if ((mpt3sas_config_get_raid_volume_pg0(ioc, &mpi_reply, vol_pg0,
 153              MPI2_RAID_VOLUME_PGAD_FORM_HANDLE, raid_device->handle, sz))) {
 154                 ioc_info(ioc, "WarpDrive : Direct IO is disabled Failure in retrieving RVPG0\n");
 155                 kfree(vol_pg0);
 156                 return;
 157         }
 158 
 159         /*
 160          * WARPDRIVE:If number of physical disks in a volume exceeds the max pds
 161          * assumed for WARPDRIVE, disable direct I/O
 162          */
 163         if (num_pds > MPT_MAX_WARPDRIVE_PDS) {
 164                 ioc_warn(ioc, "WarpDrive : Direct IO is disabled for the drive with handle(0x%04x): num_mem=%d, max_mem_allowed=%d\n",
 165                          raid_device->handle, num_pds, MPT_MAX_WARPDRIVE_PDS);
 166                 kfree(vol_pg0);
 167                 return;
 168         }
 169         for (count = 0; count < num_pds; count++) {
 170                 if (mpt3sas_config_get_phys_disk_pg0(ioc, &mpi_reply,
 171                     &pd_pg0, MPI2_PHYSDISK_PGAD_FORM_PHYSDISKNUM,
 172                     vol_pg0->PhysDisk[count].PhysDiskNum) ||
 173                     le16_to_cpu(pd_pg0.DevHandle) ==
 174                     MPT3SAS_INVALID_DEVICE_HANDLE) {
 175                         ioc_info(ioc, "WarpDrive : Direct IO is disabled for the drive with handle(0x%04x) member handle retrieval failed for member number=%d\n",
 176                                  raid_device->handle,
 177                                  vol_pg0->PhysDisk[count].PhysDiskNum);
 178                         goto out_error;
 179                 }
 180                 /* Disable direct I/O if member drive lba exceeds 4 bytes */
 181                 dev_max_lba = le64_to_cpu(pd_pg0.DeviceMaxLBA);
 182                 if (dev_max_lba >> 32) {
 183                         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",
 184                                  raid_device->handle,
 185                                  le16_to_cpu(pd_pg0.DevHandle),
 186                                  (u64)dev_max_lba);
 187                         goto out_error;
 188                 }
 189 
 190                 raid_device->pd_handle[count] = le16_to_cpu(pd_pg0.DevHandle);
 191         }
 192 
 193         /*
 194          * Assumption for WD: Direct I/O is not supported if the volume is
 195          * not RAID0
 196          */
 197         if (raid_device->volume_type != MPI2_RAID_VOL_TYPE_RAID0) {
 198                 ioc_info(ioc, "WarpDrive : Direct IO is disabled for the drive with handle(0x%04x): type=%d, s_sz=%uK, blk_size=%u\n",
 199                          raid_device->handle, raid_device->volume_type,
 200                          (le32_to_cpu(vol_pg0->StripeSize) *
 201                           le16_to_cpu(vol_pg0->BlockSize)) / 1024,
 202                          le16_to_cpu(vol_pg0->BlockSize));
 203                 goto out_error;
 204         }
 205 
 206         stripe_sz = le32_to_cpu(vol_pg0->StripeSize);
 207         stripe_exp = find_first_bit(&stripe_sz, 32);
 208         if (stripe_exp == 32) {
 209                 ioc_info(ioc, "WarpDrive : Direct IO is disabled for the drive with handle(0x%04x) invalid stripe sz %uK\n",
 210                          raid_device->handle,
 211                          (le32_to_cpu(vol_pg0->StripeSize) *
 212                           le16_to_cpu(vol_pg0->BlockSize)) / 1024);
 213                 goto out_error;
 214         }
 215         raid_device->stripe_exponent = stripe_exp;
 216         block_sz = le16_to_cpu(vol_pg0->BlockSize);
 217         block_exp = find_first_bit(&block_sz, 16);
 218         if (block_exp == 16) {
 219                 ioc_info(ioc, "WarpDrive : Direct IO is disabled for the drive with handle(0x%04x) invalid block sz %u\n",
 220                          raid_device->handle, le16_to_cpu(vol_pg0->BlockSize));
 221                 goto out_error;
 222         }
 223         raid_device->block_exponent = block_exp;
 224         raid_device->direct_io_enabled = 1;
 225 
 226         ioc_info(ioc, "WarpDrive : Direct IO is Enabled for the drive with handle(0x%04x)\n",
 227                  raid_device->handle);
 228         /*
 229          * WARPDRIVE: Though the following fields are not used for direct IO,
 230          * stored for future purpose:
 231          */
 232         raid_device->max_lba = le64_to_cpu(vol_pg0->MaxLBA);
 233         raid_device->stripe_sz = le32_to_cpu(vol_pg0->StripeSize);
 234         raid_device->block_sz = le16_to_cpu(vol_pg0->BlockSize);
 235 
 236 
 237         kfree(vol_pg0);
 238         return;
 239 
 240 out_error:
 241         raid_device->direct_io_enabled = 0;
 242         for (count = 0; count < num_pds; count++)
 243                 raid_device->pd_handle[count] = 0;
 244         kfree(vol_pg0);
 245         return;
 246 }
 247 
 248 /**
 249  * mpt3sas_setup_direct_io - setup MPI request for WARPDRIVE Direct I/O
 250  * @ioc: per adapter object
 251  * @scmd: pointer to scsi command object
 252  * @raid_device: pointer to raid device data structure
 253  * @mpi_request: pointer to the SCSI_IO reqest message frame
 254  */
 255 void
 256 mpt3sas_setup_direct_io(struct MPT3SAS_ADAPTER *ioc, struct scsi_cmnd *scmd,
 257         struct _raid_device *raid_device, Mpi25SCSIIORequest_t *mpi_request)
 258 {
 259         sector_t v_lba, p_lba, stripe_off, column, io_size;
 260         u32 stripe_sz, stripe_exp;
 261         u8 num_pds, cmd = scmd->cmnd[0];
 262         struct scsiio_tracker *st = scsi_cmd_priv(scmd);
 263 
 264         if (cmd != READ_10 && cmd != WRITE_10 &&
 265             cmd != READ_16 && cmd != WRITE_16)
 266                 return;
 267 
 268         if (cmd == READ_10 || cmd == WRITE_10)
 269                 v_lba = get_unaligned_be32(&mpi_request->CDB.CDB32[2]);
 270         else
 271                 v_lba = get_unaligned_be64(&mpi_request->CDB.CDB32[2]);
 272 
 273         io_size = scsi_bufflen(scmd) >> raid_device->block_exponent;
 274 
 275         if (v_lba + io_size - 1 > raid_device->max_lba)
 276                 return;
 277 
 278         stripe_sz = raid_device->stripe_sz;
 279         stripe_exp = raid_device->stripe_exponent;
 280         stripe_off = v_lba & (stripe_sz - 1);
 281 
 282         /* Return unless IO falls within a stripe */
 283         if (stripe_off + io_size > stripe_sz)
 284                 return;
 285 
 286         num_pds = raid_device->num_pds;
 287         p_lba = v_lba >> stripe_exp;
 288         column = sector_div(p_lba, num_pds);
 289         p_lba = (p_lba << stripe_exp) + stripe_off;
 290         mpi_request->DevHandle = cpu_to_le16(raid_device->pd_handle[column]);
 291 
 292         if (cmd == READ_10 || cmd == WRITE_10)
 293                 put_unaligned_be32(lower_32_bits(p_lba),
 294                                    &mpi_request->CDB.CDB32[2]);
 295         else
 296                 put_unaligned_be64(p_lba, &mpi_request->CDB.CDB32[2]);
 297 
 298         st->direct_io = 1;
 299 }
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