drivers/scsi/mpt3sas/mpt3sas_warpdrive.c

   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 = struct_size(vol_pg0, PhysDisk, num_pds);
 145         vol_pg0 = kzalloc(sz, GFP_KERNEL);
 146         if (!vol_pg0) {
 147                 ioc_info(ioc, "WarpDrive : Direct IO is disabled Memory allocation failure for RVPG0\n");
 148                 return;
 149         }
 150
 151         if ((mpt3sas_config_get_raid_volume_pg0(ioc, &mpi_reply, vol_pg0,
 152              MPI2_RAID_VOLUME_PGAD_FORM_HANDLE, raid_device->handle, sz))) {
 153                 ioc_info(ioc, "WarpDrive : Direct IO is disabled Failure in retrieving RVPG0\n");
 154                 kfree(vol_pg0);
 155                 return;
 156         }
 157
 158         /*
 159          * WARPDRIVE:If number of physical disks in a volume exceeds the max pds
 160          * assumed for WARPDRIVE, disable direct I/O
 161          */
 162         if (num_pds > MPT_MAX_WARPDRIVE_PDS) {
 163                 ioc_warn(ioc, "WarpDrive : Direct IO is disabled for the drive with handle(0x%04x): num_mem=%d, max_mem_allowed=%d\n",
 164                          raid_device->handle, num_pds, MPT_MAX_WARPDRIVE_PDS);
 165                 kfree(vol_pg0);
 166                 return;
 167         }
 168         for (count = 0; count < num_pds; count++) {
 169                 if (mpt3sas_config_get_phys_disk_pg0(ioc, &mpi_reply,
 170                     &pd_pg0, MPI2_PHYSDISK_PGAD_FORM_PHYSDISKNUM,
 171                     vol_pg0->PhysDisk[count].PhysDiskNum) ||
 172                     le16_to_cpu(pd_pg0.DevHandle) ==
 173                     MPT3SAS_INVALID_DEVICE_HANDLE) {
 174                         ioc_info(ioc, "WarpDrive : Direct IO is disabled for the drive with handle(0x%04x) member handle retrieval failed for member number=%d\n",
 175                                  raid_device->handle,
 176                                  vol_pg0->PhysDisk[count].PhysDiskNum);
 177                         goto out_error;
 178                 }
 179                 /* Disable direct I/O if member drive lba exceeds 4 bytes */
 180                 dev_max_lba = le64_to_cpu(pd_pg0.DeviceMaxLBA);
 181                 if (dev_max_lba >> 32) {
 182                         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",
 183                                  raid_device->handle,
 184                                  le16_to_cpu(pd_pg0.DevHandle),
 185                                  (u64)dev_max_lba);
 186                         goto out_error;
 187                 }
 188
 189                 raid_device->pd_handle[count] = le16_to_cpu(pd_pg0.DevHandle);
 190         }
 191
 192         /*
 193          * Assumption for WD: Direct I/O is not supported if the volume is
 194          * not RAID0
 195          */
 196         if (raid_device->volume_type != MPI2_RAID_VOL_TYPE_RAID0) {
 197                 ioc_info(ioc, "WarpDrive : Direct IO is disabled for the drive with handle(0x%04x): type=%d, s_sz=%uK, blk_size=%u\n",
 198                          raid_device->handle, raid_device->volume_type,
 199                          (le32_to_cpu(vol_pg0->StripeSize) *
 200                           le16_to_cpu(vol_pg0->BlockSize)) / 1024,
 201                          le16_to_cpu(vol_pg0->BlockSize));
 202                 goto out_error;
 203         }
 204
 205         stripe_sz = le32_to_cpu(vol_pg0->StripeSize);
 206         stripe_exp = find_first_bit(&stripe_sz, 32);
 207         if (stripe_exp == 32) {
 208                 ioc_info(ioc, "WarpDrive : Direct IO is disabled for the drive with handle(0x%04x) invalid stripe sz %uK\n",
 209                          raid_device->handle,
 210                          (le32_to_cpu(vol_pg0->StripeSize) *
 211                           le16_to_cpu(vol_pg0->BlockSize)) / 1024);
 212                 goto out_error;
 213         }
 214         raid_device->stripe_exponent = stripe_exp;
 215         block_sz = le16_to_cpu(vol_pg0->BlockSize);
 216         block_exp = find_first_bit(&block_sz, 16);
 217         if (block_exp == 16) {
 218                 ioc_info(ioc, "WarpDrive : Direct IO is disabled for the drive with handle(0x%04x) invalid block sz %u\n",
 219                          raid_device->handle, le16_to_cpu(vol_pg0->BlockSize));
 220                 goto out_error;
 221         }
 222         raid_device->block_exponent = block_exp;
 223         raid_device->direct_io_enabled = 1;
 224
 225         ioc_info(ioc, "WarpDrive : Direct IO is Enabled for the drive with handle(0x%04x)\n",
 226                  raid_device->handle);
 227         /*
 228          * WARPDRIVE: Though the following fields are not used for direct IO,
 229          * stored for future purpose:
 230          */
 231         raid_device->max_lba = le64_to_cpu(vol_pg0->MaxLBA);
 232         raid_device->stripe_sz = le32_to_cpu(vol_pg0->StripeSize);
 233         raid_device->block_sz = le16_to_cpu(vol_pg0->BlockSize);
 234
 235
 236         kfree(vol_pg0);
 237         return;
 238
 239 out_error:
 240         raid_device->direct_io_enabled = 0;
 241         for (count = 0; count < num_pds; count++)
 242                 raid_device->pd_handle[count] = 0;
 243         kfree(vol_pg0);
 244         return;
 245 }
 246
 247 /**
 248  * mpt3sas_setup_direct_io - setup MPI request for WARPDRIVE Direct I/O
 249  * @ioc: per adapter object
 250  * @scmd: pointer to scsi command object
 251  * @raid_device: pointer to raid device data structure
 252  * @mpi_request: pointer to the SCSI_IO reqest message frame
 253  */
 254 void
 255 mpt3sas_setup_direct_io(struct MPT3SAS_ADAPTER *ioc, struct scsi_cmnd *scmd,
 256         struct _raid_device *raid_device, Mpi25SCSIIORequest_t *mpi_request)
 257 {
 258         sector_t v_lba, p_lba, stripe_off, column, io_size;
 259         u32 stripe_sz, stripe_exp;
 260         u8 num_pds, cmd = scmd->cmnd[0];
 261         struct scsiio_tracker *st = scsi_cmd_priv(scmd);
 262
 263         if (cmd != READ_10 && cmd != WRITE_10 &&
 264             cmd != READ_16 && cmd != WRITE_16)
 265                 return;
 266
 267         if (cmd == READ_10 || cmd == WRITE_10)
 268                 v_lba = get_unaligned_be32(&mpi_request->CDB.CDB32[2]);
 269         else
 270                 v_lba = get_unaligned_be64(&mpi_request->CDB.CDB32[2]);
 271
 272         io_size = scsi_bufflen(scmd) >> raid_device->block_exponent;
 273
 274         if (v_lba + io_size - 1 > raid_device->max_lba)
 275                 return;
 276
 277         stripe_sz = raid_device->stripe_sz;
 278         stripe_exp = raid_device->stripe_exponent;
 279         stripe_off = v_lba & (stripe_sz - 1);
 280
 281         /* Return unless IO falls within a stripe */
 282         if (stripe_off + io_size > stripe_sz)
 283                 return;
 284
 285         num_pds = raid_device->num_pds;
 286         p_lba = v_lba >> stripe_exp;
 287         column = sector_div(p_lba, num_pds);
 288         p_lba = (p_lba << stripe_exp) + stripe_off;
 289         mpi_request->DevHandle = cpu_to_le16(raid_device->pd_handle[column]);
 290
 291         if (cmd == READ_10 || cmd == WRITE_10)
 292                 put_unaligned_be32(lower_32_bits(p_lba),
 293                                    &mpi_request->CDB.CDB32[2]);
 294         else
 295                 put_unaligned_be64(p_lba, &mpi_request->CDB.CDB32[2]);
 296
 297         st->direct_io = 1;
 298 }