drivers/scsi/megaraid/megaraid_sas_fp.c

   1 /*
   2  *  Linux MegaRAID driver for SAS based RAID controllers
   3  *
   4  *  Copyright (c) 2009-2013  LSI Corporation
   5  *  Copyright (c) 2013-2014  Avago Technologies
   6  *
   7  *  This program is free software; you can redistribute it and/or
   8  *  modify it under the terms of the GNU General Public License
   9  *  as published by the Free Software Foundation; either version 2
  10  *  of the License, or (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19  *
  20  *  FILE: megaraid_sas_fp.c
  21  *
  22  *  Authors: Avago Technologies
  23  *           Sumant Patro
  24  *           Varad Talamacki
  25  *           Manoj Jose
  26  *           Kashyap Desai <kashyap.desai@avagotech.com>
  27  *           Sumit Saxena <sumit.saxena@avagotech.com>
  28  *
  29  *  Send feedback to: megaraidlinux.pdl@avagotech.com
  30  *
  31  *  Mail to: Avago Technologies, 350 West Trimble Road, Building 90,
  32  *  San Jose, California 95131
  33  */
  34
  35 #include <linux/kernel.h>
  36 #include <linux/types.h>
  37 #include <linux/pci.h>
  38 #include <linux/list.h>
  39 #include <linux/moduleparam.h>
  40 #include <linux/module.h>
  41 #include <linux/spinlock.h>
  42 #include <linux/interrupt.h>
  43 #include <linux/delay.h>
  44 #include <linux/uio.h>
  45 #include <linux/uaccess.h>
  46 #include <linux/fs.h>
  47 #include <linux/compat.h>
  48 #include <linux/blkdev.h>
  49 #include <linux/poll.h>
  50
  51 #include <scsi/scsi.h>
  52 #include <scsi/scsi_cmnd.h>
  53 #include <scsi/scsi_device.h>
  54 #include <scsi/scsi_host.h>
  55
  56 #include "megaraid_sas_fusion.h"
  57 #include "megaraid_sas.h"
  58 #include <asm/div64.h>
  59
  60 #define LB_PENDING_CMDS_DEFAULT 4
  61 static unsigned int lb_pending_cmds = LB_PENDING_CMDS_DEFAULT;
  62 module_param(lb_pending_cmds, int, S_IRUGO);
  63 MODULE_PARM_DESC(lb_pending_cmds, "Change raid-1 load balancing outstanding "
  64         "threshold. Valid Values are 1-128. Default: 4");
  65
  66
  67 #define ABS_DIFF(a, b)   (((a) > (b)) ? ((a) - (b)) : ((b) - (a)))
  68 #define MR_LD_STATE_OPTIMAL 3
  69
  70 #define SPAN_ROW_SIZE(map, ld, index_) (MR_LdSpanPtrGet(ld, index_, map)->spanRowSize)
  71 #define SPAN_ROW_DATA_SIZE(map_, ld, index_)   (MR_LdSpanPtrGet(ld, index_, map)->spanRowDataSize)
  72 #define SPAN_INVALID  0xff
  73
  74 /* Prototypes */
  75 static void mr_update_span_set(struct MR_DRV_RAID_MAP_ALL *map,
  76         PLD_SPAN_INFO ldSpanInfo);
  77 static u8 mr_spanset_get_phy_params(struct megasas_instance *instance, u32 ld,
  78         u64 stripRow, u16 stripRef, struct IO_REQUEST_INFO *io_info,
  79         struct RAID_CONTEXT *pRAID_Context, struct MR_DRV_RAID_MAP_ALL *map);
  80 static u64 get_row_from_strip(struct megasas_instance *instance, u32 ld,
  81         u64 strip, struct MR_DRV_RAID_MAP_ALL *map);
  82
  83 u32 mega_mod64(u64 dividend, u32 divisor)
  84 {
  85         u64 d;
  86         u32 remainder;
  87
  88         if (!divisor)
  89                 printk(KERN_ERR "megasas : DIVISOR is zero, in div fn\n");
  90         d = dividend;
  91         remainder = do_div(d, divisor);
  92         return remainder;
  93 }
  94
  95 /**
  96  * @param dividend    : Dividend
  97  * @param divisor    : Divisor
  98  *
  99  * @return quotient
 100  **/
 101 u64 mega_div64_32(uint64_t dividend, uint32_t divisor)
 102 {
 103         u32 remainder;
 104         u64 d;
 105
 106         if (!divisor)
 107                 printk(KERN_ERR "megasas : DIVISOR is zero in mod fn\n");
 108
 109         d = dividend;
 110         remainder = do_div(d, divisor);
 111
 112         return d;
 113 }
 114
 115 struct MR_LD_RAID *MR_LdRaidGet(u32 ld, struct MR_DRV_RAID_MAP_ALL *map)
 116 {
 117         return &map->raidMap.ldSpanMap[ld].ldRaid;
 118 }
 119
 120 static struct MR_SPAN_BLOCK_INFO *MR_LdSpanInfoGet(u32 ld,
 121                                                    struct MR_DRV_RAID_MAP_ALL
 122                                                    *map)
 123 {
 124         return &map->raidMap.ldSpanMap[ld].spanBlock[0];
 125 }
 126
 127 static u8 MR_LdDataArmGet(u32 ld, u32 armIdx, struct MR_DRV_RAID_MAP_ALL *map)
 128 {
 129         return map->raidMap.ldSpanMap[ld].dataArmMap[armIdx];
 130 }
 131
 132 u16 MR_ArPdGet(u32 ar, u32 arm, struct MR_DRV_RAID_MAP_ALL *map)
 133 {
 134         return le16_to_cpu(map->raidMap.arMapInfo[ar].pd[arm]);
 135 }
 136
 137 u16 MR_LdSpanArrayGet(u32 ld, u32 span, struct MR_DRV_RAID_MAP_ALL *map)
 138 {
 139         return le16_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].span.arrayRef);
 140 }
 141
 142 __le16 MR_PdDevHandleGet(u32 pd, struct MR_DRV_RAID_MAP_ALL *map)
 143 {
 144         return map->raidMap.devHndlInfo[pd].curDevHdl;
 145 }
 146
 147 static u8 MR_PdInterfaceTypeGet(u32 pd, struct MR_DRV_RAID_MAP_ALL *map)
 148 {
 149         return map->raidMap.devHndlInfo[pd].interfaceType;
 150 }
 151
 152 u16 MR_GetLDTgtId(u32 ld, struct MR_DRV_RAID_MAP_ALL *map)
 153 {
 154         return le16_to_cpu(map->raidMap.ldSpanMap[ld].ldRaid.targetId);
 155 }
 156
 157 u16 MR_TargetIdToLdGet(u32 ldTgtId, struct MR_DRV_RAID_MAP_ALL *map)
 158 {
 159         return map->raidMap.ldTgtIdToLd[ldTgtId];
 160 }
 161
 162 static struct MR_LD_SPAN *MR_LdSpanPtrGet(u32 ld, u32 span,
 163                                           struct MR_DRV_RAID_MAP_ALL *map)
 164 {
 165         return &map->raidMap.ldSpanMap[ld].spanBlock[span].span;
 166 }
 167
 168 /*
 169  * This function will Populate Driver Map using firmware raid map
 170  */
 171 static int MR_PopulateDrvRaidMap(struct megasas_instance *instance, u64 map_id)
 172 {
 173         struct fusion_context *fusion = instance->ctrl_context;
 174         struct MR_FW_RAID_MAP_ALL     *fw_map_old    = NULL;
 175         struct MR_FW_RAID_MAP         *pFwRaidMap    = NULL;
 176         int i, j;
 177         u16 ld_count;
 178         struct MR_FW_RAID_MAP_DYNAMIC *fw_map_dyn;
 179         struct MR_FW_RAID_MAP_EXT *fw_map_ext;
 180         struct MR_RAID_MAP_DESC_TABLE *desc_table;
 181
 182
 183         struct MR_DRV_RAID_MAP_ALL *drv_map =
 184                         fusion->ld_drv_map[(map_id & 1)];
 185         struct MR_DRV_RAID_MAP *pDrvRaidMap = &drv_map->raidMap;
 186         void *raid_map_data = NULL;
 187
 188         memset(drv_map, 0, fusion->drv_map_sz);
 189         memset(pDrvRaidMap->ldTgtIdToLd,
 190                0xff, (sizeof(u16) * MAX_LOGICAL_DRIVES_DYN));
 191
 192         if (instance->max_raid_mapsize) {
 193                 fw_map_dyn = fusion->ld_map[(map_id & 1)];
 194                 desc_table =
 195                 (struct MR_RAID_MAP_DESC_TABLE *)((void *)fw_map_dyn + le32_to_cpu(fw_map_dyn->desc_table_offset));
 196                 if (desc_table != fw_map_dyn->raid_map_desc_table)
 197                         dev_dbg(&instance->pdev->dev, "offsets of desc table are not matching desc %p original %p\n",
 198                                 desc_table, fw_map_dyn->raid_map_desc_table);
 199
 200                 ld_count = (u16)le16_to_cpu(fw_map_dyn->ld_count);
 201                 pDrvRaidMap->ldCount = (__le16)cpu_to_le16(ld_count);
 202                 pDrvRaidMap->fpPdIoTimeoutSec =
 203                         fw_map_dyn->fp_pd_io_timeout_sec;
 204                 pDrvRaidMap->totalSize =
 205                         cpu_to_le32(sizeof(struct MR_DRV_RAID_MAP_ALL));
 206                 /* point to actual data starting point*/
 207                 raid_map_data = (void *)fw_map_dyn +
 208                         le32_to_cpu(fw_map_dyn->desc_table_offset) +
 209                         le32_to_cpu(fw_map_dyn->desc_table_size);
 210
 211                 for (i = 0; i < le32_to_cpu(fw_map_dyn->desc_table_num_elements); ++i) {
 212                         switch (le32_to_cpu(desc_table->raid_map_desc_type)) {
 213                         case RAID_MAP_DESC_TYPE_DEVHDL_INFO:
 214                                 fw_map_dyn->dev_hndl_info =
 215                                 (struct MR_DEV_HANDLE_INFO *)(raid_map_data + le32_to_cpu(desc_table->raid_map_desc_offset));
 216                                 memcpy(pDrvRaidMap->devHndlInfo,
 217                                         fw_map_dyn->dev_hndl_info,
 218                                         sizeof(struct MR_DEV_HANDLE_INFO) *
 219                                         le32_to_cpu(desc_table->raid_map_desc_elements));
 220                         break;
 221                         case RAID_MAP_DESC_TYPE_TGTID_INFO:
 222                                 fw_map_dyn->ld_tgt_id_to_ld =
 223                                         (u16 *)(raid_map_data +
 224                                         le32_to_cpu(desc_table->raid_map_desc_offset));
 225                                 for (j = 0; j < le32_to_cpu(desc_table->raid_map_desc_elements); j++) {
 226                                         pDrvRaidMap->ldTgtIdToLd[j] =
 227                                                 le16_to_cpu(fw_map_dyn->ld_tgt_id_to_ld[j]);
 228                                 }
 229                         break;
 230                         case RAID_MAP_DESC_TYPE_ARRAY_INFO:
 231                                 fw_map_dyn->ar_map_info =
 232                                         (struct MR_ARRAY_INFO *)
 233                                         (raid_map_data + le32_to_cpu(desc_table->raid_map_desc_offset));
 234                                 memcpy(pDrvRaidMap->arMapInfo,
 235                                        fw_map_dyn->ar_map_info,
 236                                        sizeof(struct MR_ARRAY_INFO) *
 237                                        le32_to_cpu(desc_table->raid_map_desc_elements));
 238                         break;
 239                         case RAID_MAP_DESC_TYPE_SPAN_INFO:
 240                                 fw_map_dyn->ld_span_map =
 241                                         (struct MR_LD_SPAN_MAP *)
 242                                         (raid_map_data +
 243                                         le32_to_cpu(desc_table->raid_map_desc_offset));
 244                                 memcpy(pDrvRaidMap->ldSpanMap,
 245                                        fw_map_dyn->ld_span_map,
 246                                        sizeof(struct MR_LD_SPAN_MAP) *
 247                                        le32_to_cpu(desc_table->raid_map_desc_elements));
 248                         break;
 249                         default:
 250                                 dev_dbg(&instance->pdev->dev, "wrong number of desctableElements %d\n",
 251                                         fw_map_dyn->desc_table_num_elements);
 252                         }
 253                         ++desc_table;
 254                 }
 255
 256         } else if (instance->supportmax256vd) {
 257                 fw_map_ext =
 258                         (struct MR_FW_RAID_MAP_EXT *)fusion->ld_map[(map_id & 1)];
 259                 ld_count = (u16)le16_to_cpu(fw_map_ext->ldCount);
 260                 if (ld_count > MAX_LOGICAL_DRIVES_EXT) {
 261                         dev_dbg(&instance->pdev->dev, "megaraid_sas: LD count exposed in RAID map in not valid\n");
 262                         return 1;
 263                 }
 264
 265                 pDrvRaidMap->ldCount = (__le16)cpu_to_le16(ld_count);
 266                 pDrvRaidMap->fpPdIoTimeoutSec = fw_map_ext->fpPdIoTimeoutSec;
 267                 for (i = 0; i < (MAX_LOGICAL_DRIVES_EXT); i++)
 268                         pDrvRaidMap->ldTgtIdToLd[i] =
 269                                 (u16)fw_map_ext->ldTgtIdToLd[i];
 270                 memcpy(pDrvRaidMap->ldSpanMap, fw_map_ext->ldSpanMap,
 271                        sizeof(struct MR_LD_SPAN_MAP) * ld_count);
 272                 memcpy(pDrvRaidMap->arMapInfo, fw_map_ext->arMapInfo,
 273                        sizeof(struct MR_ARRAY_INFO) * MAX_API_ARRAYS_EXT);
 274                 memcpy(pDrvRaidMap->devHndlInfo, fw_map_ext->devHndlInfo,
 275                        sizeof(struct MR_DEV_HANDLE_INFO) *
 276                        MAX_RAIDMAP_PHYSICAL_DEVICES);
 277
 278                 /* New Raid map will not set totalSize, so keep expected value
 279                  * for legacy code in ValidateMapInfo
 280                  */
 281                 pDrvRaidMap->totalSize =
 282                         cpu_to_le32(sizeof(struct MR_FW_RAID_MAP_EXT));
 283         } else {
 284                 fw_map_old = (struct MR_FW_RAID_MAP_ALL *)
 285                                 fusion->ld_map[(map_id & 1)];
 286                 pFwRaidMap = &fw_map_old->raidMap;
 287                 ld_count = (u16)le32_to_cpu(pFwRaidMap->ldCount);
 288                 if (ld_count > MAX_LOGICAL_DRIVES) {
 289                         dev_dbg(&instance->pdev->dev,
 290                                 "LD count exposed in RAID map in not valid\n");
 291                         return 1;
 292                 }
 293
 294                 pDrvRaidMap->totalSize = pFwRaidMap->totalSize;
 295                 pDrvRaidMap->ldCount = (__le16)cpu_to_le16(ld_count);
 296                 pDrvRaidMap->fpPdIoTimeoutSec = pFwRaidMap->fpPdIoTimeoutSec;
 297                 for (i = 0; i < MAX_RAIDMAP_LOGICAL_DRIVES + MAX_RAIDMAP_VIEWS; i++)
 298                         pDrvRaidMap->ldTgtIdToLd[i] =
 299                                 (u8)pFwRaidMap->ldTgtIdToLd[i];
 300                 for (i = 0; i < ld_count; i++) {
 301                         pDrvRaidMap->ldSpanMap[i] = pFwRaidMap->ldSpanMap[i];
 302                 }
 303                 memcpy(pDrvRaidMap->arMapInfo, pFwRaidMap->arMapInfo,
 304                         sizeof(struct MR_ARRAY_INFO) * MAX_RAIDMAP_ARRAYS);
 305                 memcpy(pDrvRaidMap->devHndlInfo, pFwRaidMap->devHndlInfo,
 306                         sizeof(struct MR_DEV_HANDLE_INFO) *
 307                         MAX_RAIDMAP_PHYSICAL_DEVICES);
 308         }
 309
 310         return 0;
 311 }
 312
 313 /*
 314  * This function will validate Map info data provided by FW
 315  */
 316 u8 MR_ValidateMapInfo(struct megasas_instance *instance, u64 map_id)
 317 {
 318         struct fusion_context *fusion;
 319         struct MR_DRV_RAID_MAP_ALL *drv_map;
 320         struct MR_DRV_RAID_MAP *pDrvRaidMap;
 321         struct LD_LOAD_BALANCE_INFO *lbInfo;
 322         PLD_SPAN_INFO ldSpanInfo;
 323         struct MR_LD_RAID         *raid;
 324         u16 num_lds, i;
 325         u16 ld;
 326         u32 expected_size;
 327
 328         if (MR_PopulateDrvRaidMap(instance, map_id))
 329                 return 0;
 330
 331         fusion = instance->ctrl_context;
 332         drv_map = fusion->ld_drv_map[(map_id & 1)];
 333         pDrvRaidMap = &drv_map->raidMap;
 334
 335         lbInfo = fusion->load_balance_info;
 336         ldSpanInfo = fusion->log_to_span;
 337
 338         if (instance->max_raid_mapsize)
 339                 expected_size = sizeof(struct MR_DRV_RAID_MAP_ALL);
 340         else if (instance->supportmax256vd)
 341                 expected_size = sizeof(struct MR_FW_RAID_MAP_EXT);
 342         else
 343                 expected_size =
 344                         (sizeof(struct MR_FW_RAID_MAP) - sizeof(struct MR_LD_SPAN_MAP) +
 345                         (sizeof(struct MR_LD_SPAN_MAP) * le16_to_cpu(pDrvRaidMap->ldCount)));
 346
 347         if (le32_to_cpu(pDrvRaidMap->totalSize) != expected_size) {
 348                 dev_dbg(&instance->pdev->dev, "megasas: map info structure size 0x%x",
 349                         le32_to_cpu(pDrvRaidMap->totalSize));
 350                 dev_dbg(&instance->pdev->dev, "is not matching expected size 0x%x\n",
 351                         (unsigned int)expected_size);
 352                 dev_err(&instance->pdev->dev, "megasas: span map %x, pDrvRaidMap->totalSize : %x\n",
 353                         (unsigned int)sizeof(struct MR_LD_SPAN_MAP),
 354                         le32_to_cpu(pDrvRaidMap->totalSize));
 355                 return 0;
 356         }
 357
 358         if (instance->UnevenSpanSupport)
 359                 mr_update_span_set(drv_map, ldSpanInfo);
 360
 361         if (lbInfo)
 362                 mr_update_load_balance_params(drv_map, lbInfo);
 363
 364         num_lds = le16_to_cpu(drv_map->raidMap.ldCount);
 365
 366         /*Convert Raid capability values to CPU arch */
 367         for (i = 0; (num_lds > 0) && (i < MAX_LOGICAL_DRIVES_EXT); i++) {
 368                 ld = MR_TargetIdToLdGet(i, drv_map);
 369
 370                 /* For non existing VDs, iterate to next VD*/
 371                 if (ld >= (MAX_LOGICAL_DRIVES_EXT - 1))
 372                         continue;
 373
 374                 raid = MR_LdRaidGet(ld, drv_map);
 375                 le32_to_cpus((u32 *)&raid->capability);
 376
 377                 num_lds--;
 378         }
 379
 380         return 1;
 381 }
 382
 383 u32 MR_GetSpanBlock(u32 ld, u64 row, u64 *span_blk,
 384                     struct MR_DRV_RAID_MAP_ALL *map)
 385 {
 386         struct MR_SPAN_BLOCK_INFO *pSpanBlock = MR_LdSpanInfoGet(ld, map);
 387         struct MR_QUAD_ELEMENT    *quad;
 388         struct MR_LD_RAID         *raid = MR_LdRaidGet(ld, map);
 389         u32                span, j;
 390
 391         for (span = 0; span < raid->spanDepth; span++, pSpanBlock++) {
 392
 393                 for (j = 0; j < le32_to_cpu(pSpanBlock->block_span_info.noElements); j++) {
 394                         quad = &pSpanBlock->block_span_info.quad[j];
 395
 396                         if (le32_to_cpu(quad->diff) == 0)
 397                                 return SPAN_INVALID;
 398                         if (le64_to_cpu(quad->logStart) <= row && row <=
 399                                 le64_to_cpu(quad->logEnd) && (mega_mod64(row - le64_to_cpu(quad->logStart),
 400                                 le32_to_cpu(quad->diff))) == 0) {
 401                                 if (span_blk != NULL) {
 402                                         u64  blk, debugBlk;
 403                                         blk =  mega_div64_32((row-le64_to_cpu(quad->logStart)), le32_to_cpu(quad->diff));
 404                                         debugBlk = blk;
 405
 406                                         blk = (blk + le64_to_cpu(quad->offsetInSpan)) << raid->stripeShift;
 407                                         *span_blk = blk;
 408                                 }
 409                                 return span;
 410                         }
 411                 }
 412         }
 413         return SPAN_INVALID;
 414 }
 415
 416 /*
 417 ******************************************************************************
 418 *
 419 * This routine calculates the Span block for given row using spanset.
 420 *
 421 * Inputs :
 422 *    instance - HBA instance
 423 *    ld   - Logical drive number
 424 *    row        - Row number
 425 *    map    - LD map
 426 *
 427 * Outputs :
 428 *
 429 *    span          - Span number
 430 *    block         - Absolute Block number in the physical disk
 431 *    div_error     - Devide error code.
 432 */
 433
 434 u32 mr_spanset_get_span_block(struct megasas_instance *instance,
 435                 u32 ld, u64 row, u64 *span_blk, struct MR_DRV_RAID_MAP_ALL *map)
 436 {
 437         struct fusion_context *fusion = instance->ctrl_context;
 438         struct MR_LD_RAID         *raid = MR_LdRaidGet(ld, map);
 439         LD_SPAN_SET *span_set;
 440         struct MR_QUAD_ELEMENT    *quad;
 441         u32    span, info;
 442         PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span;
 443
 444         for (info = 0; info < MAX_QUAD_DEPTH; info++) {
 445                 span_set = &(ldSpanInfo[ld].span_set[info]);
 446
 447                 if (span_set->span_row_data_width == 0)
 448                         break;
 449
 450                 if (row > span_set->data_row_end)
 451                         continue;
 452
 453                 for (span = 0; span < raid->spanDepth; span++)
 454                         if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
 455                                 block_span_info.noElements) >= info+1) {
 456                                 quad = &map->raidMap.ldSpanMap[ld].
 457                                         spanBlock[span].
 458                                         block_span_info.quad[info];
 459                                 if (le32_to_cpu(quad->diff) == 0)
 460                                         return SPAN_INVALID;
 461                                 if (le64_to_cpu(quad->logStart) <= row  &&
 462                                         row <= le64_to_cpu(quad->logEnd)  &&
 463                                         (mega_mod64(row - le64_to_cpu(quad->logStart),
 464                                                 le32_to_cpu(quad->diff))) == 0) {
 465                                         if (span_blk != NULL) {
 466                                                 u64  blk;
 467                                                 blk = mega_div64_32
 468                                                     ((row - le64_to_cpu(quad->logStart)),
 469                                                     le32_to_cpu(quad->diff));
 470                                                 blk = (blk + le64_to_cpu(quad->offsetInSpan))
 471                                                          << raid->stripeShift;
 472                                                 *span_blk = blk;
 473                                         }
 474                                         return span;
 475                                 }
 476                         }
 477         }
 478         return SPAN_INVALID;
 479 }
 480
 481 /*
 482 ******************************************************************************
 483 *
 484 * This routine calculates the row for given strip using spanset.
 485 *
 486 * Inputs :
 487 *    instance - HBA instance
 488 *    ld   - Logical drive number
 489 *    Strip        - Strip
 490 *    map    - LD map
 491 *
 492 * Outputs :
 493 *
 494 *    row         - row associated with strip
 495 */
 496
 497 static u64  get_row_from_strip(struct megasas_instance *instance,
 498         u32 ld, u64 strip, struct MR_DRV_RAID_MAP_ALL *map)
 499 {
 500         struct fusion_context *fusion = instance->ctrl_context;
 501         struct MR_LD_RAID       *raid = MR_LdRaidGet(ld, map);
 502         LD_SPAN_SET     *span_set;
 503         PLD_SPAN_INFO   ldSpanInfo = fusion->log_to_span;
 504         u32             info, strip_offset, span, span_offset;
 505         u64             span_set_Strip, span_set_Row, retval;
 506
 507         for (info = 0; info < MAX_QUAD_DEPTH; info++) {
 508                 span_set = &(ldSpanInfo[ld].span_set[info]);
 509
 510                 if (span_set->span_row_data_width == 0)
 511                         break;
 512                 if (strip > span_set->data_strip_end)
 513                         continue;
 514
 515                 span_set_Strip = strip - span_set->data_strip_start;
 516                 strip_offset = mega_mod64(span_set_Strip,
 517                                 span_set->span_row_data_width);
 518                 span_set_Row = mega_div64_32(span_set_Strip,
 519                                 span_set->span_row_data_width) * span_set->diff;
 520                 for (span = 0, span_offset = 0; span < raid->spanDepth; span++)
 521                         if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
 522                                 block_span_info.noElements) >= info+1) {
 523                                 if (strip_offset >=
 524                                         span_set->strip_offset[span])
 525                                         span_offset++;
 526                                 else
 527                                         break;
 528                         }
 529
 530                 retval = (span_set->data_row_start + span_set_Row +
 531                                 (span_offset - 1));
 532                 return retval;
 533         }
 534         return -1LLU;
 535 }
 536
 537
 538 /*
 539 ******************************************************************************
 540 *
 541 * This routine calculates the Start Strip for given row using spanset.
 542 *
 543 * Inputs :
 544 *    instance - HBA instance
 545 *    ld   - Logical drive number
 546 *    row        - Row number
 547 *    map    - LD map
 548 *
 549 * Outputs :
 550 *
 551 *    Strip         - Start strip associated with row
 552 */
 553
 554 static u64 get_strip_from_row(struct megasas_instance *instance,
 555                 u32 ld, u64 row, struct MR_DRV_RAID_MAP_ALL *map)
 556 {
 557         struct fusion_context *fusion = instance->ctrl_context;
 558         struct MR_LD_RAID         *raid = MR_LdRaidGet(ld, map);
 559         LD_SPAN_SET *span_set;
 560         struct MR_QUAD_ELEMENT    *quad;
 561         PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span;
 562         u32    span, info;
 563         u64  strip;
 564
 565         for (info = 0; info < MAX_QUAD_DEPTH; info++) {
 566                 span_set = &(ldSpanInfo[ld].span_set[info]);
 567
 568                 if (span_set->span_row_data_width == 0)
 569                         break;
 570                 if (row > span_set->data_row_end)
 571                         continue;
 572
 573                 for (span = 0; span < raid->spanDepth; span++)
 574                         if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
 575                                 block_span_info.noElements) >= info+1) {
 576                                 quad = &map->raidMap.ldSpanMap[ld].
 577                                         spanBlock[span].block_span_info.quad[info];
 578                                 if (le64_to_cpu(quad->logStart) <= row  &&
 579                                         row <= le64_to_cpu(quad->logEnd)  &&
 580                                         mega_mod64((row - le64_to_cpu(quad->logStart)),
 581                                         le32_to_cpu(quad->diff)) == 0) {
 582                                         strip = mega_div64_32
 583                                                 (((row - span_set->data_row_start)
 584                                                         - le64_to_cpu(quad->logStart)),
 585                                                         le32_to_cpu(quad->diff));
 586                                         strip *= span_set->span_row_data_width;
 587                                         strip += span_set->data_strip_start;
 588                                         strip += span_set->strip_offset[span];
 589                                         return strip;
 590                                 }
 591                         }
 592         }
 593         dev_err(&instance->pdev->dev, "get_strip_from_row"
 594                 "returns invalid strip for ld=%x, row=%lx\n",
 595                 ld, (long unsigned int)row);
 596         return -1;
 597 }
 598
 599 /*
 600 ******************************************************************************
 601 *
 602 * This routine calculates the Physical Arm for given strip using spanset.
 603 *
 604 * Inputs :
 605 *    instance - HBA instance
 606 *    ld   - Logical drive number
 607 *    strip      - Strip
 608 *    map    - LD map
 609 *
 610 * Outputs :
 611 *
 612 *    Phys Arm         - Phys Arm associated with strip
 613 */
 614
 615 static u32 get_arm_from_strip(struct megasas_instance *instance,
 616         u32 ld, u64 strip, struct MR_DRV_RAID_MAP_ALL *map)
 617 {
 618         struct fusion_context *fusion = instance->ctrl_context;
 619         struct MR_LD_RAID         *raid = MR_LdRaidGet(ld, map);
 620         LD_SPAN_SET *span_set;
 621         PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span;
 622         u32    info, strip_offset, span, span_offset, retval;
 623
 624         for (info = 0 ; info < MAX_QUAD_DEPTH; info++) {
 625                 span_set = &(ldSpanInfo[ld].span_set[info]);
 626
 627                 if (span_set->span_row_data_width == 0)
 628                         break;
 629                 if (strip > span_set->data_strip_end)
 630                         continue;
 631
 632                 strip_offset = (uint)mega_mod64
 633                                 ((strip - span_set->data_strip_start),
 634                                 span_set->span_row_data_width);
 635
 636                 for (span = 0, span_offset = 0; span < raid->spanDepth; span++)
 637                         if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
 638                                 block_span_info.noElements) >= info+1) {
 639                                 if (strip_offset >=
 640                                         span_set->strip_offset[span])
 641                                         span_offset =
 642                                                 span_set->strip_offset[span];
 643                                 else
 644                                         break;
 645                         }
 646
 647                 retval = (strip_offset - span_offset);
 648                 return retval;
 649         }
 650
 651         dev_err(&instance->pdev->dev, "get_arm_from_strip"
 652                 "returns invalid arm for ld=%x strip=%lx\n",
 653                 ld, (long unsigned int)strip);
 654
 655         return -1;
 656 }
 657
 658 /* This Function will return Phys arm */
 659 u8 get_arm(struct megasas_instance *instance, u32 ld, u8 span, u64 stripe,
 660                 struct MR_DRV_RAID_MAP_ALL *map)
 661 {
 662         struct MR_LD_RAID  *raid = MR_LdRaidGet(ld, map);
 663         /* Need to check correct default value */
 664         u32    arm = 0;
 665
 666         switch (raid->level) {
 667         case 0:
 668         case 5:
 669         case 6:
 670                 arm = mega_mod64(stripe, SPAN_ROW_SIZE(map, ld, span));
 671                 break;
 672         case 1:
 673                 /* start with logical arm */
 674                 arm = get_arm_from_strip(instance, ld, stripe, map);
 675                 if (arm != -1U)
 676                         arm *= 2;
 677                 break;
 678         }
 679
 680         return arm;
 681 }
 682
 683
 684 /*
 685 ******************************************************************************
 686 *
 687 * This routine calculates the arm, span and block for the specified stripe and
 688 * reference in stripe using spanset
 689 *
 690 * Inputs :
 691 *
 692 *    ld   - Logical drive number
 693 *    stripRow        - Stripe number
 694 *    stripRef    - Reference in stripe
 695 *
 696 * Outputs :
 697 *
 698 *    span          - Span number
 699 *    block         - Absolute Block number in the physical disk
 700 */
 701 static u8 mr_spanset_get_phy_params(struct megasas_instance *instance, u32 ld,
 702                 u64 stripRow, u16 stripRef, struct IO_REQUEST_INFO *io_info,
 703                 struct RAID_CONTEXT *pRAID_Context,
 704                 struct MR_DRV_RAID_MAP_ALL *map)
 705 {
 706         struct MR_LD_RAID  *raid = MR_LdRaidGet(ld, map);
 707         u32     pd, arRef, r1_alt_pd;
 708         u8      physArm, span;
 709         u64     row;
 710         u8      retval = true;
 711         u64     *pdBlock = &io_info->pdBlock;
 712         __le16  *pDevHandle = &io_info->devHandle;
 713         u8      *pPdInterface = &io_info->pd_interface;
 714         u32     logArm, rowMod, armQ, arm;
 715         struct fusion_context *fusion;
 716
 717         fusion = instance->ctrl_context;
 718         *pDevHandle = cpu_to_le16(MR_DEVHANDLE_INVALID);
 719
 720         /*Get row and span from io_info for Uneven Span IO.*/
 721         row         = io_info->start_row;
 722         span        = io_info->start_span;
 723
 724
 725         if (raid->level == 6) {
 726                 logArm = get_arm_from_strip(instance, ld, stripRow, map);
 727                 if (logArm == -1U)
 728                         return false;
 729                 rowMod = mega_mod64(row, SPAN_ROW_SIZE(map, ld, span));
 730                 armQ = SPAN_ROW_SIZE(map, ld, span) - 1 - rowMod;
 731                 arm = armQ + 1 + logArm;
 732                 if (arm >= SPAN_ROW_SIZE(map, ld, span))
 733                         arm -= SPAN_ROW_SIZE(map, ld, span);
 734                 physArm = (u8)arm;
 735         } else
 736                 /* Calculate the arm */
 737                 physArm = get_arm(instance, ld, span, stripRow, map);
 738         if (physArm == 0xFF)
 739                 return false;
 740
 741         arRef       = MR_LdSpanArrayGet(ld, span, map);
 742         pd          = MR_ArPdGet(arRef, physArm, map);
 743
 744         if (pd != MR_PD_INVALID) {
 745                 *pDevHandle = MR_PdDevHandleGet(pd, map);
 746                 *pPdInterface = MR_PdInterfaceTypeGet(pd, map);
 747                 /* get second pd also for raid 1/10 fast path writes*/
 748                 if ((instance->adapter_type == VENTURA_SERIES) &&
 749                     (raid->level == 1) &&
 750                     !io_info->isRead) {
 751                         r1_alt_pd = MR_ArPdGet(arRef, physArm + 1, map);
 752                         if (r1_alt_pd != MR_PD_INVALID)
 753                                 io_info->r1_alt_dev_handle =
 754                                 MR_PdDevHandleGet(r1_alt_pd, map);
 755                 }
 756         } else {
 757                 if ((raid->level >= 5) &&
 758                         ((instance->adapter_type == THUNDERBOLT_SERIES)  ||
 759                         ((instance->adapter_type == INVADER_SERIES) &&
 760                         (raid->regTypeReqOnRead != REGION_TYPE_UNUSED))))
 761                         pRAID_Context->reg_lock_flags = REGION_TYPE_EXCLUSIVE;
 762                 else if (raid->level == 1) {
 763                         physArm = physArm + 1;
 764                         pd = MR_ArPdGet(arRef, physArm, map);
 765                         if (pd != MR_PD_INVALID) {
 766                                 *pDevHandle = MR_PdDevHandleGet(pd, map);
 767                                 *pPdInterface = MR_PdInterfaceTypeGet(pd, map);
 768                         }
 769                 }
 770         }
 771
 772         *pdBlock += stripRef + le64_to_cpu(MR_LdSpanPtrGet(ld, span, map)->startBlk);
 773         if (instance->adapter_type == VENTURA_SERIES) {
 774                 ((struct RAID_CONTEXT_G35 *)pRAID_Context)->span_arm =
 775                         (span << RAID_CTX_SPANARM_SPAN_SHIFT) | physArm;
 776                 io_info->span_arm =
 777                         (span << RAID_CTX_SPANARM_SPAN_SHIFT) | physArm;
 778         } else {
 779                 pRAID_Context->span_arm =
 780                         (span << RAID_CTX_SPANARM_SPAN_SHIFT) | physArm;
 781                 io_info->span_arm = pRAID_Context->span_arm;
 782         }
 783         io_info->pd_after_lb = pd;
 784         return retval;
 785 }
 786
 787 /*
 788 ******************************************************************************
 789 *
 790 * This routine calculates the arm, span and block for the specified stripe and
 791 * reference in stripe.
 792 *
 793 * Inputs :
 794 *
 795 *    ld   - Logical drive number
 796 *    stripRow        - Stripe number
 797 *    stripRef    - Reference in stripe
 798 *
 799 * Outputs :
 800 *
 801 *    span          - Span number
 802 *    block         - Absolute Block number in the physical disk
 803 */
 804 u8 MR_GetPhyParams(struct megasas_instance *instance, u32 ld, u64 stripRow,
 805                 u16 stripRef, struct IO_REQUEST_INFO *io_info,
 806                 struct RAID_CONTEXT *pRAID_Context,
 807                 struct MR_DRV_RAID_MAP_ALL *map)
 808 {
 809         struct MR_LD_RAID  *raid = MR_LdRaidGet(ld, map);
 810         u32         pd, arRef, r1_alt_pd;
 811         u8          physArm, span;
 812         u64         row;
 813         u8          retval = true;
 814         u64         *pdBlock = &io_info->pdBlock;
 815         __le16      *pDevHandle = &io_info->devHandle;
 816         u8          *pPdInterface = &io_info->pd_interface;
 817         struct fusion_context *fusion;
 818
 819         fusion = instance->ctrl_context;
 820         *pDevHandle = cpu_to_le16(MR_DEVHANDLE_INVALID);
 821
 822         row =  mega_div64_32(stripRow, raid->rowDataSize);
 823
 824         if (raid->level == 6) {
 825                 /* logical arm within row */
 826                 u32 logArm =  mega_mod64(stripRow, raid->rowDataSize);
 827                 u32 rowMod, armQ, arm;
 828
 829                 if (raid->rowSize == 0)
 830                         return false;
 831                 /* get logical row mod */
 832                 rowMod = mega_mod64(row, raid->rowSize);
 833                 armQ = raid->rowSize-1-rowMod; /* index of Q drive */
 834                 arm = armQ+1+logArm; /* data always logically follows Q */
 835                 if (arm >= raid->rowSize) /* handle wrap condition */
 836                         arm -= raid->rowSize;
 837                 physArm = (u8)arm;
 838         } else  {
 839                 if (raid->modFactor == 0)
 840                         return false;
 841                 physArm = MR_LdDataArmGet(ld,  mega_mod64(stripRow,
 842                                                           raid->modFactor),
 843                                           map);
 844         }
 845
 846         if (raid->spanDepth == 1) {
 847                 span = 0;
 848                 *pdBlock = row << raid->stripeShift;
 849         } else {
 850                 span = (u8)MR_GetSpanBlock(ld, row, pdBlock, map);
 851                 if (span == SPAN_INVALID)
 852                         return false;
 853         }
 854
 855         /* Get the array on which this span is present */
 856         arRef       = MR_LdSpanArrayGet(ld, span, map);
 857         pd          = MR_ArPdGet(arRef, physArm, map); /* Get the pd */
 858
 859         if (pd != MR_PD_INVALID) {
 860                 /* Get dev handle from Pd. */
 861                 *pDevHandle = MR_PdDevHandleGet(pd, map);
 862                 *pPdInterface = MR_PdInterfaceTypeGet(pd, map);
 863                 /* get second pd also for raid 1/10 fast path writes*/
 864                 if ((instance->adapter_type == VENTURA_SERIES) &&
 865                     (raid->level == 1) &&
 866                     !io_info->isRead) {
 867                         r1_alt_pd = MR_ArPdGet(arRef, physArm + 1, map);
 868                         if (r1_alt_pd != MR_PD_INVALID)
 869                                 io_info->r1_alt_dev_handle =
 870                                         MR_PdDevHandleGet(r1_alt_pd, map);
 871                 }
 872         } else {
 873                 if ((raid->level >= 5) &&
 874                         ((instance->adapter_type == THUNDERBOLT_SERIES)  ||
 875                         ((instance->adapter_type == INVADER_SERIES) &&
 876                         (raid->regTypeReqOnRead != REGION_TYPE_UNUSED))))
 877                         pRAID_Context->reg_lock_flags = REGION_TYPE_EXCLUSIVE;
 878                 else if (raid->level == 1) {
 879                         /* Get alternate Pd. */
 880                         physArm = physArm + 1;
 881                         pd = MR_ArPdGet(arRef, physArm, map);
 882                         if (pd != MR_PD_INVALID) {
 883                                 /* Get dev handle from Pd */
 884                                 *pDevHandle = MR_PdDevHandleGet(pd, map);
 885                                 *pPdInterface = MR_PdInterfaceTypeGet(pd, map);
 886                         }
 887                 }
 888         }
 889
 890         *pdBlock += stripRef + le64_to_cpu(MR_LdSpanPtrGet(ld, span, map)->startBlk);
 891         if (instance->adapter_type == VENTURA_SERIES) {
 892                 ((struct RAID_CONTEXT_G35 *)pRAID_Context)->span_arm =
 893                                 (span << RAID_CTX_SPANARM_SPAN_SHIFT) | physArm;
 894                 io_info->span_arm =
 895                                 (span << RAID_CTX_SPANARM_SPAN_SHIFT) | physArm;
 896         } else {
 897                 pRAID_Context->span_arm =
 898                         (span << RAID_CTX_SPANARM_SPAN_SHIFT) | physArm;
 899                 io_info->span_arm = pRAID_Context->span_arm;
 900         }
 901         io_info->pd_after_lb = pd;
 902         return retval;
 903 }
 904
 905 /*
 906 ******************************************************************************
 907 *
 908 * MR_BuildRaidContext function
 909 *
 910 * This function will initiate command processing.  The start/end row and strip
 911 * information is calculated then the lock is acquired.
 912 * This function will return 0 if region lock was acquired OR return num strips
 913 */
 914 u8
 915 MR_BuildRaidContext(struct megasas_instance *instance,
 916                     struct IO_REQUEST_INFO *io_info,
 917                     struct RAID_CONTEXT *pRAID_Context,
 918                     struct MR_DRV_RAID_MAP_ALL *map, u8 **raidLUN)
 919 {
 920         struct fusion_context *fusion;
 921         struct MR_LD_RAID  *raid;
 922         u32         stripSize, stripe_mask;
 923         u64         endLba, endStrip, endRow, start_row, start_strip;
 924         u64         regStart;
 925         u32         regSize;
 926         u8          num_strips, numRows;
 927         u16         ref_in_start_stripe, ref_in_end_stripe;
 928         u64         ldStartBlock;
 929         u32         numBlocks, ldTgtId;
 930         u8          isRead;
 931         u8          retval = 0;
 932         u8          startlba_span = SPAN_INVALID;
 933         u64 *pdBlock = &io_info->pdBlock;
 934         u16         ld;
 935
 936         ldStartBlock = io_info->ldStartBlock;
 937         numBlocks = io_info->numBlocks;
 938         ldTgtId = io_info->ldTgtId;
 939         isRead = io_info->isRead;
 940         io_info->IoforUnevenSpan = 0;
 941         io_info->start_span     = SPAN_INVALID;
 942         fusion = instance->ctrl_context;
 943
 944         ld = MR_TargetIdToLdGet(ldTgtId, map);
 945         raid = MR_LdRaidGet(ld, map);
 946         /*check read ahead bit*/
 947         io_info->ra_capable = raid->capability.ra_capable;
 948
 949         /*
 950          * if rowDataSize @RAID map and spanRowDataSize @SPAN INFO are zero
 951          * return FALSE
 952          */
 953         if (raid->rowDataSize == 0) {
 954                 if (MR_LdSpanPtrGet(ld, 0, map)->spanRowDataSize == 0)
 955                         return false;
 956                 else if (instance->UnevenSpanSupport) {
 957                         io_info->IoforUnevenSpan = 1;
 958                 } else {
 959                         dev_info(&instance->pdev->dev,
 960                                 "raid->rowDataSize is 0, but has SPAN[0]"
 961                                 "rowDataSize = 0x%0x,"
 962                                 "but there is _NO_ UnevenSpanSupport\n",
 963                                 MR_LdSpanPtrGet(ld, 0, map)->spanRowDataSize);
 964                         return false;
 965                 }
 966         }
 967
 968         stripSize = 1 << raid->stripeShift;
 969         stripe_mask = stripSize-1;
 970
 971
 972         /*
 973          * calculate starting row and stripe, and number of strips and rows
 974          */
 975         start_strip         = ldStartBlock >> raid->stripeShift;
 976         ref_in_start_stripe = (u16)(ldStartBlock & stripe_mask);
 977         endLba              = ldStartBlock + numBlocks - 1;
 978         ref_in_end_stripe   = (u16)(endLba & stripe_mask);
 979         endStrip            = endLba >> raid->stripeShift;
 980         num_strips          = (u8)(endStrip - start_strip + 1); /* End strip */
 981
 982         if (io_info->IoforUnevenSpan) {
 983                 start_row = get_row_from_strip(instance, ld, start_strip, map);
 984                 endRow    = get_row_from_strip(instance, ld, endStrip, map);
 985                 if (start_row == -1ULL || endRow == -1ULL) {
 986                         dev_info(&instance->pdev->dev, "return from %s %d."
 987                                 "Send IO w/o region lock.\n",
 988                                 __func__, __LINE__);
 989                         return false;
 990                 }
 991
 992                 if (raid->spanDepth == 1) {
 993                         startlba_span = 0;
 994                         *pdBlock = start_row << raid->stripeShift;
 995                 } else
 996                         startlba_span = (u8)mr_spanset_get_span_block(instance,
 997                                                 ld, start_row, pdBlock, map);
 998                 if (startlba_span == SPAN_INVALID) {
 999                         dev_info(&instance->pdev->dev, "return from %s %d"
1000                                 "for row 0x%llx,start strip %llx"
1001                                 "endSrip %llx\n", __func__, __LINE__,
1002                                 (unsigned long long)start_row,
1003                                 (unsigned long long)start_strip,
1004                                 (unsigned long long)endStrip);
1005                         return false;
1006                 }
1007                 io_info->start_span     = startlba_span;
1008                 io_info->start_row      = start_row;
1009         } else {
1010                 start_row = mega_div64_32(start_strip, raid->rowDataSize);
1011                 endRow    = mega_div64_32(endStrip, raid->rowDataSize);
1012         }
1013         numRows = (u8)(endRow - start_row + 1);
1014
1015         /*
1016          * calculate region info.
1017          */
1018
1019         /* assume region is at the start of the first row */
1020         regStart            = start_row << raid->stripeShift;
1021         /* assume this IO needs the full row - we'll adjust if not true */
1022         regSize             = stripSize;
1023
1024         io_info->do_fp_rlbypass = raid->capability.fpBypassRegionLock;
1025
1026         /* Check if we can send this I/O via FastPath */
1027         if (raid->capability.fpCapable) {
1028                 if (isRead)
1029                         io_info->fpOkForIo = (raid->capability.fpReadCapable &&
1030                                               ((num_strips == 1) ||
1031                                                raid->capability.
1032                                                fpReadAcrossStripe));
1033                 else
1034                         io_info->fpOkForIo = (raid->capability.fpWriteCapable &&
1035                                               ((num_strips == 1) ||
1036                                                raid->capability.
1037                                                fpWriteAcrossStripe));
1038         } else
1039                 io_info->fpOkForIo = false;
1040
1041         if (numRows == 1) {
1042                 /* single-strip IOs can always lock only the data needed */
1043                 if (num_strips == 1) {
1044                         regStart += ref_in_start_stripe;
1045                         regSize = numBlocks;
1046                 }
1047                 /* multi-strip IOs always need to full stripe locked */
1048         } else if (io_info->IoforUnevenSpan == 0) {
1049                 /*
1050                  * For Even span region lock optimization.
1051                  * If the start strip is the last in the start row
1052                  */
1053                 if (start_strip == (start_row + 1) * raid->rowDataSize - 1) {
1054                         regStart += ref_in_start_stripe;
1055                         /* initialize count to sectors from startref to end
1056                            of strip */
1057                         regSize = stripSize - ref_in_start_stripe;
1058                 }
1059
1060                 /* add complete rows in the middle of the transfer */
1061                 if (numRows > 2)
1062                         regSize += (numRows-2) << raid->stripeShift;
1063
1064                 /* if IO ends within first strip of last row*/
1065                 if (endStrip == endRow*raid->rowDataSize)
1066                         regSize += ref_in_end_stripe+1;
1067                 else
1068                         regSize += stripSize;
1069         } else {
1070                 /*
1071                  * For Uneven span region lock optimization.
1072                  * If the start strip is the last in the start row
1073                  */
1074                 if (start_strip == (get_strip_from_row(instance, ld, start_row, map) +
1075                                 SPAN_ROW_DATA_SIZE(map, ld, startlba_span) - 1)) {
1076                         regStart += ref_in_start_stripe;
1077                         /* initialize count to sectors from
1078                          * startRef to end of strip
1079                          */
1080                         regSize = stripSize - ref_in_start_stripe;
1081                 }
1082                 /* Add complete rows in the middle of the transfer*/
1083
1084                 if (numRows > 2)
1085                         /* Add complete rows in the middle of the transfer*/
1086                         regSize += (numRows-2) << raid->stripeShift;
1087
1088                 /* if IO ends within first strip of last row */
1089                 if (endStrip == get_strip_from_row(instance, ld, endRow, map))
1090                         regSize += ref_in_end_stripe + 1;
1091                 else
1092                         regSize += stripSize;
1093         }
1094
1095         pRAID_Context->timeout_value =
1096                 cpu_to_le16(raid->fpIoTimeoutForLd ?
1097                             raid->fpIoTimeoutForLd :
1098                             map->raidMap.fpPdIoTimeoutSec);
1099         if (instance->adapter_type == INVADER_SERIES)
1100                 pRAID_Context->reg_lock_flags = (isRead) ?
1101                         raid->regTypeReqOnRead : raid->regTypeReqOnWrite;
1102         else if (instance->adapter_type == THUNDERBOLT_SERIES)
1103                 pRAID_Context->reg_lock_flags = (isRead) ?
1104                         REGION_TYPE_SHARED_READ : raid->regTypeReqOnWrite;
1105         pRAID_Context->virtual_disk_tgt_id = raid->targetId;
1106         pRAID_Context->reg_lock_row_lba    = cpu_to_le64(regStart);
1107         pRAID_Context->reg_lock_length    = cpu_to_le32(regSize);
1108         pRAID_Context->config_seq_num   = raid->seqNum;
1109         /* save pointer to raid->LUN array */
1110         *raidLUN = raid->LUN;
1111
1112
1113         /*Get Phy Params only if FP capable, or else leave it to MR firmware
1114           to do the calculation.*/
1115         if (io_info->fpOkForIo) {
1116                 retval = io_info->IoforUnevenSpan ?
1117                                 mr_spanset_get_phy_params(instance, ld,
1118                                         start_strip, ref_in_start_stripe,
1119                                         io_info, pRAID_Context, map) :
1120                                 MR_GetPhyParams(instance, ld, start_strip,
1121                                         ref_in_start_stripe, io_info,
1122                                         pRAID_Context, map);
1123                 /* If IO on an invalid Pd, then FP is not possible.*/
1124                 if (io_info->devHandle == MR_DEVHANDLE_INVALID)
1125                         io_info->fpOkForIo = false;
1126                 return retval;
1127         } else if (isRead) {
1128                 uint stripIdx;
1129                 for (stripIdx = 0; stripIdx < num_strips; stripIdx++) {
1130                         retval = io_info->IoforUnevenSpan ?
1131                                 mr_spanset_get_phy_params(instance, ld,
1132                                     start_strip + stripIdx,
1133                                     ref_in_start_stripe, io_info,
1134                                     pRAID_Context, map) :
1135                                 MR_GetPhyParams(instance, ld,
1136                                     start_strip + stripIdx, ref_in_start_stripe,
1137                                     io_info, pRAID_Context, map);
1138                         if (!retval)
1139                                 return true;
1140                 }
1141         }
1142         return true;
1143 }
1144
1145 /*
1146 ******************************************************************************
1147 *
1148 * This routine pepare spanset info from Valid Raid map and store it into
1149 * local copy of ldSpanInfo per instance data structure.
1150 *
1151 * Inputs :
1152 * map    - LD map
1153 * ldSpanInfo - ldSpanInfo per HBA instance
1154 *
1155 */
1156 void mr_update_span_set(struct MR_DRV_RAID_MAP_ALL *map,
1157         PLD_SPAN_INFO ldSpanInfo)
1158 {
1159         u8   span, count;
1160         u32  element, span_row_width;
1161         u64  span_row;
1162         struct MR_LD_RAID *raid;
1163         LD_SPAN_SET *span_set, *span_set_prev;
1164         struct MR_QUAD_ELEMENT    *quad;
1165         int ldCount;
1166         u16 ld;
1167
1168
1169         for (ldCount = 0; ldCount < MAX_LOGICAL_DRIVES_EXT; ldCount++) {
1170                 ld = MR_TargetIdToLdGet(ldCount, map);
1171                 if (ld >= (MAX_LOGICAL_DRIVES_EXT - 1))
1172                         continue;
1173                 raid = MR_LdRaidGet(ld, map);
1174                 for (element = 0; element < MAX_QUAD_DEPTH; element++) {
1175                         for (span = 0; span < raid->spanDepth; span++) {
1176                                 if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
1177                                         block_span_info.noElements) <
1178                                         element + 1)
1179                                         continue;
1180                                 span_set = &(ldSpanInfo[ld].span_set[element]);
1181                                 quad = &map->raidMap.ldSpanMap[ld].
1182                                         spanBlock[span].block_span_info.
1183                                         quad[element];
1184
1185                                 span_set->diff = le32_to_cpu(quad->diff);
1186
1187                                 for (count = 0, span_row_width = 0;
1188                                         count < raid->spanDepth; count++) {
1189                                         if (le32_to_cpu(map->raidMap.ldSpanMap[ld].
1190                                                 spanBlock[count].
1191                                                 block_span_info.
1192                                                 noElements) >= element + 1) {
1193                                                 span_set->strip_offset[count] =
1194                                                         span_row_width;
1195                                                 span_row_width +=
1196                                                         MR_LdSpanPtrGet
1197                                                         (ld, count, map)->spanRowDataSize;
1198                                         }
1199                                 }
1200
1201                                 span_set->span_row_data_width = span_row_width;
1202                                 span_row = mega_div64_32(((le64_to_cpu(quad->logEnd) -
1203                                         le64_to_cpu(quad->logStart)) + le32_to_cpu(quad->diff)),
1204                                         le32_to_cpu(quad->diff));
1205
1206                                 if (element == 0) {
1207                                         span_set->log_start_lba = 0;
1208                                         span_set->log_end_lba =
1209                                                 ((span_row << raid->stripeShift)
1210                                                 * span_row_width) - 1;
1211
1212                                         span_set->span_row_start = 0;
1213                                         span_set->span_row_end = span_row - 1;
1214
1215                                         span_set->data_strip_start = 0;
1216                                         span_set->data_strip_end =
1217                                                 (span_row * span_row_width) - 1;
1218
1219                                         span_set->data_row_start = 0;
1220                                         span_set->data_row_end =
1221                                                 (span_row * le32_to_cpu(quad->diff)) - 1;
1222                                 } else {
1223                                         span_set_prev = &(ldSpanInfo[ld].
1224                                                         span_set[element - 1]);
1225                                         span_set->log_start_lba =
1226                                                 span_set_prev->log_end_lba + 1;
1227                                         span_set->log_end_lba =
1228                                                 span_set->log_start_lba +
1229                                                 ((span_row << raid->stripeShift)
1230                                                 * span_row_width) - 1;
1231
1232                                         span_set->span_row_start =
1233                                                 span_set_prev->span_row_end + 1;
1234                                         span_set->span_row_end =
1235                                         span_set->span_row_start + span_row - 1;
1236
1237                                         span_set->data_strip_start =
1238                                         span_set_prev->data_strip_end + 1;
1239                                         span_set->data_strip_end =
1240                                                 span_set->data_strip_start +
1241                                                 (span_row * span_row_width) - 1;
1242
1243                                         span_set->data_row_start =
1244                                                 span_set_prev->data_row_end + 1;
1245                                         span_set->data_row_end =
1246                                                 span_set->data_row_start +
1247                                                 (span_row * le32_to_cpu(quad->diff)) - 1;
1248                                 }
1249                                 break;
1250                 }
1251                 if (span == raid->spanDepth)
1252                         break;
1253             }
1254         }
1255 }
1256
1257 void mr_update_load_balance_params(struct MR_DRV_RAID_MAP_ALL *drv_map,
1258         struct LD_LOAD_BALANCE_INFO *lbInfo)
1259 {
1260         int ldCount;
1261         u16 ld;
1262         struct MR_LD_RAID *raid;
1263
1264         if (lb_pending_cmds > 128 || lb_pending_cmds < 1)
1265                 lb_pending_cmds = LB_PENDING_CMDS_DEFAULT;
1266
1267         for (ldCount = 0; ldCount < MAX_LOGICAL_DRIVES_EXT; ldCount++) {
1268                 ld = MR_TargetIdToLdGet(ldCount, drv_map);
1269                 if (ld >= MAX_LOGICAL_DRIVES_EXT - 1) {
1270                         lbInfo[ldCount].loadBalanceFlag = 0;
1271                         continue;
1272                 }
1273
1274                 raid = MR_LdRaidGet(ld, drv_map);
1275                 if ((raid->level != 1) ||
1276                         (raid->ldState != MR_LD_STATE_OPTIMAL)) {
1277                         lbInfo[ldCount].loadBalanceFlag = 0;
1278                         continue;
1279                 }
1280                 lbInfo[ldCount].loadBalanceFlag = 1;
1281         }
1282 }
1283
1284 u8 megasas_get_best_arm_pd(struct megasas_instance *instance,
1285                            struct LD_LOAD_BALANCE_INFO *lbInfo,
1286                            struct IO_REQUEST_INFO *io_info,
1287                            struct MR_DRV_RAID_MAP_ALL *drv_map)
1288 {
1289         struct MR_LD_RAID  *raid;
1290         u16     pd1_dev_handle;
1291         u16     pend0, pend1, ld;
1292         u64     diff0, diff1;
1293         u8      bestArm, pd0, pd1, span, arm;
1294         u32     arRef, span_row_size;
1295
1296         u64 block = io_info->ldStartBlock;
1297         u32 count = io_info->numBlocks;
1298
1299         span = ((io_info->span_arm & RAID_CTX_SPANARM_SPAN_MASK)
1300                         >> RAID_CTX_SPANARM_SPAN_SHIFT);
1301         arm = (io_info->span_arm & RAID_CTX_SPANARM_ARM_MASK);
1302
1303         ld = MR_TargetIdToLdGet(io_info->ldTgtId, drv_map);
1304         raid = MR_LdRaidGet(ld, drv_map);
1305         span_row_size = instance->UnevenSpanSupport ?
1306                         SPAN_ROW_SIZE(drv_map, ld, span) : raid->rowSize;
1307
1308         arRef = MR_LdSpanArrayGet(ld, span, drv_map);
1309         pd0 = MR_ArPdGet(arRef, arm, drv_map);
1310         pd1 = MR_ArPdGet(arRef, (arm + 1) >= span_row_size ?
1311                 (arm + 1 - span_row_size) : arm + 1, drv_map);
1312
1313         /* Get PD1 Dev Handle */
1314
1315         pd1_dev_handle = MR_PdDevHandleGet(pd1, drv_map);
1316
1317         if (pd1_dev_handle == MR_DEVHANDLE_INVALID) {
1318                 bestArm = arm;
1319         } else {
1320                 /* get the pending cmds for the data and mirror arms */
1321                 pend0 = atomic_read(&lbInfo->scsi_pending_cmds[pd0]);
1322                 pend1 = atomic_read(&lbInfo->scsi_pending_cmds[pd1]);
1323
1324                 /* Determine the disk whose head is nearer to the req. block */
1325                 diff0 = ABS_DIFF(block, lbInfo->last_accessed_block[pd0]);
1326                 diff1 = ABS_DIFF(block, lbInfo->last_accessed_block[pd1]);
1327                 bestArm = (diff0 <= diff1 ? arm : arm ^ 1);
1328
1329                 /* Make balance count from 16 to 4 to
1330                  *  keep driver in sync with Firmware
1331                  */
1332                 if ((bestArm == arm && pend0 > pend1 + lb_pending_cmds)  ||
1333                     (bestArm != arm && pend1 > pend0 + lb_pending_cmds))
1334                         bestArm ^= 1;
1335
1336                 /* Update the last accessed block on the correct pd */
1337                 io_info->span_arm =
1338                         (span << RAID_CTX_SPANARM_SPAN_SHIFT) | bestArm;
1339                 io_info->pd_after_lb = (bestArm == arm) ? pd0 : pd1;
1340         }
1341
1342         lbInfo->last_accessed_block[io_info->pd_after_lb] = block + count - 1;
1343         return io_info->pd_after_lb;
1344 }
1345
1346 __le16 get_updated_dev_handle(struct megasas_instance *instance,
1347                               struct LD_LOAD_BALANCE_INFO *lbInfo,
1348                               struct IO_REQUEST_INFO *io_info,
1349                               struct MR_DRV_RAID_MAP_ALL *drv_map)
1350 {
1351         u8 arm_pd;
1352         __le16 devHandle;
1353
1354         /* get best new arm (PD ID) */
1355         arm_pd  = megasas_get_best_arm_pd(instance, lbInfo, io_info, drv_map);
1356         devHandle = MR_PdDevHandleGet(arm_pd, drv_map);
1357         io_info->pd_interface = MR_PdInterfaceTypeGet(arm_pd, drv_map);
1358         atomic_inc(&lbInfo->scsi_pending_cmds[arm_pd]);
1359
1360         return devHandle;
1361 }