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 */ 53static 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 */ 85u8 86mpt3sas_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 */ 113void 114mpt3sas_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 239out_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 */ 254void 255mpt3sas_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} 299