kernel/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 #define FALSE 0
  70 #define TRUE 1
  71
  72 #define SPAN_DEBUG 0
  73 #define SPAN_ROW_SIZE(map, ld, index_) (MR_LdSpanPtrGet(ld, index_, map)->spanRowSize)
  74 #define SPAN_ROW_DATA_SIZE(map_, ld, index_)   (MR_LdSpanPtrGet(ld, index_, map)->spanRowDataSize)
  75 #define SPAN_INVALID  0xff
  76
  77 /* Prototypes */
  78 static void mr_update_span_set(struct MR_DRV_RAID_MAP_ALL *map,
  79         PLD_SPAN_INFO ldSpanInfo);
  80 static u8 mr_spanset_get_phy_params(struct megasas_instance *instance, u32 ld,
  81         u64 stripRow, u16 stripRef, struct IO_REQUEST_INFO *io_info,
  82         struct RAID_CONTEXT *pRAID_Context, struct MR_DRV_RAID_MAP_ALL *map);
  83 static u64 get_row_from_strip(struct megasas_instance *instance, u32 ld,
  84         u64 strip, struct MR_DRV_RAID_MAP_ALL *map);
  85
  86 u32 mega_mod64(u64 dividend, u32 divisor)
  87 {
  88         u64 d;
  89         u32 remainder;
  90
  91         if (!divisor)
  92                 printk(KERN_ERR "megasas : DIVISOR is zero, in div fn\n");
  93         d = dividend;
  94         remainder = do_div(d, divisor);
  95         return remainder;
  96 }
  97
  98 /**
  99  * @param dividend    : Dividend
 100  * @param divisor    : Divisor
 101  *
 102  * @return quotient
 103  **/
 104 u64 mega_div64_32(uint64_t dividend, uint32_t divisor)
 105 {
 106         u32 remainder;
 107         u64 d;
 108
 109         if (!divisor)
 110                 printk(KERN_ERR "megasas : DIVISOR is zero in mod fn\n");
 111
 112         d = dividend;
 113         remainder = do_div(d, divisor);
 114
 115         return d;
 116 }
 117
 118 struct MR_LD_RAID *MR_LdRaidGet(u32 ld, struct MR_DRV_RAID_MAP_ALL *map)
 119 {
 120         return &map->raidMap.ldSpanMap[ld].ldRaid;
 121 }
 122
 123 static struct MR_SPAN_BLOCK_INFO *MR_LdSpanInfoGet(u32 ld,
 124                                                    struct MR_DRV_RAID_MAP_ALL
 125                                                    *map)
 126 {
 127         return &map->raidMap.ldSpanMap[ld].spanBlock[0];
 128 }
 129
 130 static u8 MR_LdDataArmGet(u32 ld, u32 armIdx, struct MR_DRV_RAID_MAP_ALL *map)
 131 {
 132         return map->raidMap.ldSpanMap[ld].dataArmMap[armIdx];
 133 }
 134
 135 u16 MR_ArPdGet(u32 ar, u32 arm, struct MR_DRV_RAID_MAP_ALL *map)
 136 {
 137         return le16_to_cpu(map->raidMap.arMapInfo[ar].pd[arm]);
 138 }
 139
 140 u16 MR_LdSpanArrayGet(u32 ld, u32 span, struct MR_DRV_RAID_MAP_ALL *map)
 141 {
 142         return le16_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].span.arrayRef);
 143 }
 144
 145 u16 MR_PdDevHandleGet(u32 pd, struct MR_DRV_RAID_MAP_ALL *map)
 146 {
 147         return map->raidMap.devHndlInfo[pd].curDevHdl;
 148 }
 149
 150 u16 MR_GetLDTgtId(u32 ld, struct MR_DRV_RAID_MAP_ALL *map)
 151 {
 152         return le16_to_cpu(map->raidMap.ldSpanMap[ld].ldRaid.targetId);
 153 }
 154
 155 u8 MR_TargetIdToLdGet(u32 ldTgtId, struct MR_DRV_RAID_MAP_ALL *map)
 156 {
 157         return map->raidMap.ldTgtIdToLd[ldTgtId];
 158 }
 159
 160 static struct MR_LD_SPAN *MR_LdSpanPtrGet(u32 ld, u32 span,
 161                                           struct MR_DRV_RAID_MAP_ALL *map)
 162 {
 163         return &map->raidMap.ldSpanMap[ld].spanBlock[span].span;
 164 }
 165
 166 /*
 167  * This function will Populate Driver Map using firmware raid map
 168  */
 169 void MR_PopulateDrvRaidMap(struct megasas_instance *instance)
 170 {
 171         struct fusion_context *fusion = instance->ctrl_context;
 172         struct MR_FW_RAID_MAP_ALL     *fw_map_old    = NULL;
 173         struct MR_FW_RAID_MAP         *pFwRaidMap    = NULL;
 174         int i;
 175         u16 ld_count;
 176
 177
 178         struct MR_DRV_RAID_MAP_ALL *drv_map =
 179                         fusion->ld_drv_map[(instance->map_id & 1)];
 180         struct MR_DRV_RAID_MAP *pDrvRaidMap = &drv_map->raidMap;
 181
 182         if (instance->supportmax256vd) {
 183                 memcpy(fusion->ld_drv_map[instance->map_id & 1],
 184                         fusion->ld_map[instance->map_id & 1],
 185                         fusion->current_map_sz);
 186                 /* New Raid map will not set totalSize, so keep expected value
 187                  * for legacy code in ValidateMapInfo
 188                  */
 189                 pDrvRaidMap->totalSize =
 190                         cpu_to_le32(sizeof(struct MR_FW_RAID_MAP_EXT));
 191         } else {
 192                 fw_map_old = (struct MR_FW_RAID_MAP_ALL *)
 193                         fusion->ld_map[(instance->map_id & 1)];
 194                 pFwRaidMap = &fw_map_old->raidMap;
 195                 ld_count = (u16)le32_to_cpu(pFwRaidMap->ldCount);
 196
 197 #if VD_EXT_DEBUG
 198                 for (i = 0; i < ld_count; i++) {
 199                         dev_dbg(&instance->pdev->dev, "(%d) :Index 0x%x "
 200                                 "Target Id 0x%x Seq Num 0x%x Size 0/%llx\n",
 201                                 instance->unique_id, i,
 202                                 fw_map_old->raidMap.ldSpanMap[i].ldRaid.targetId,
 203                                 fw_map_old->raidMap.ldSpanMap[i].ldRaid.seqNum,
 204                                 fw_map_old->raidMap.ldSpanMap[i].ldRaid.size);
 205                 }
 206 #endif
 207
 208                 memset(drv_map, 0, fusion->drv_map_sz);
 209                 pDrvRaidMap->totalSize = pFwRaidMap->totalSize;
 210                 pDrvRaidMap->ldCount = (__le16)cpu_to_le16(ld_count);
 211                 pDrvRaidMap->fpPdIoTimeoutSec = pFwRaidMap->fpPdIoTimeoutSec;
 212                 for (i = 0; i < MAX_RAIDMAP_LOGICAL_DRIVES + MAX_RAIDMAP_VIEWS; i++)
 213                         pDrvRaidMap->ldTgtIdToLd[i] =
 214                                 (u8)pFwRaidMap->ldTgtIdToLd[i];
 215                 for (i = (MAX_RAIDMAP_LOGICAL_DRIVES + MAX_RAIDMAP_VIEWS);
 216                         i < MAX_LOGICAL_DRIVES_EXT; i++)
 217                         pDrvRaidMap->ldTgtIdToLd[i] = 0xff;
 218                 for (i = 0; i < ld_count; i++) {
 219                         pDrvRaidMap->ldSpanMap[i] = pFwRaidMap->ldSpanMap[i];
 220 #if VD_EXT_DEBUG
 221                         dev_dbg(&instance->pdev->dev,
 222                                 "pFwRaidMap->ldSpanMap[%d].ldRaid.targetId 0x%x "
 223                                 "pFwRaidMap->ldSpanMap[%d].ldRaid.seqNum 0x%x "
 224                                 "size 0x%x\n", i, i,
 225                                 pFwRaidMap->ldSpanMap[i].ldRaid.targetId,
 226                                 pFwRaidMap->ldSpanMap[i].ldRaid.seqNum,
 227                                 (u32)pFwRaidMap->ldSpanMap[i].ldRaid.rowSize);
 228                         dev_dbg(&instance->pdev->dev,
 229                                 "pDrvRaidMap->ldSpanMap[%d].ldRaid.targetId 0x%x "
 230                                 "pDrvRaidMap->ldSpanMap[%d].ldRaid.seqNum 0x%x "
 231                                 "size 0x%x\n", i, i,
 232                                 pDrvRaidMap->ldSpanMap[i].ldRaid.targetId,
 233                                 pDrvRaidMap->ldSpanMap[i].ldRaid.seqNum,
 234                                 (u32)pDrvRaidMap->ldSpanMap[i].ldRaid.rowSize);
 235                         dev_dbg(&instance->pdev->dev, "Driver raid map all %p "
 236                                 "raid map %p LD RAID MAP %p/%p\n", drv_map,
 237                                 pDrvRaidMap, &pFwRaidMap->ldSpanMap[i].ldRaid,
 238                                 &pDrvRaidMap->ldSpanMap[i].ldRaid);
 239 #endif
 240                 }
 241                 memcpy(pDrvRaidMap->arMapInfo, pFwRaidMap->arMapInfo,
 242                         sizeof(struct MR_ARRAY_INFO) * MAX_RAIDMAP_ARRAYS);
 243                 memcpy(pDrvRaidMap->devHndlInfo, pFwRaidMap->devHndlInfo,
 244                         sizeof(struct MR_DEV_HANDLE_INFO) *
 245                         MAX_RAIDMAP_PHYSICAL_DEVICES);
 246         }
 247 }
 248
 249 /*
 250  * This function will validate Map info data provided by FW
 251  */
 252 u8 MR_ValidateMapInfo(struct megasas_instance *instance)
 253 {
 254         struct fusion_context *fusion;
 255         struct MR_DRV_RAID_MAP_ALL *drv_map;
 256         struct MR_DRV_RAID_MAP *pDrvRaidMap;
 257         struct LD_LOAD_BALANCE_INFO *lbInfo;
 258         PLD_SPAN_INFO ldSpanInfo;
 259         struct MR_LD_RAID         *raid;
 260         u16 ldCount, num_lds;
 261         u16 ld;
 262         u32 expected_size;
 263
 264
 265         MR_PopulateDrvRaidMap(instance);
 266
 267         fusion = instance->ctrl_context;
 268         drv_map = fusion->ld_drv_map[(instance->map_id & 1)];
 269         pDrvRaidMap = &drv_map->raidMap;
 270
 271         lbInfo = fusion->load_balance_info;
 272         ldSpanInfo = fusion->log_to_span;
 273
 274         if (instance->supportmax256vd)
 275                 expected_size = sizeof(struct MR_FW_RAID_MAP_EXT);
 276         else
 277                 expected_size =
 278                         (sizeof(struct MR_FW_RAID_MAP) - sizeof(struct MR_LD_SPAN_MAP) +
 279                         (sizeof(struct MR_LD_SPAN_MAP) * le16_to_cpu(pDrvRaidMap->ldCount)));
 280
 281         if (le32_to_cpu(pDrvRaidMap->totalSize) != expected_size) {
 282                 dev_err(&instance->pdev->dev, "map info structure size 0x%x is not matching with ld count\n",
 283                        (unsigned int) expected_size);
 284                 dev_err(&instance->pdev->dev, "megasas: span map %x, pDrvRaidMap->totalSize : %x\n",
 285                         (unsigned int)sizeof(struct MR_LD_SPAN_MAP),
 286                         le32_to_cpu(pDrvRaidMap->totalSize));
 287                 return 0;
 288         }
 289
 290         if (instance->UnevenSpanSupport)
 291                 mr_update_span_set(drv_map, ldSpanInfo);
 292
 293         mr_update_load_balance_params(drv_map, lbInfo);
 294
 295         num_lds = le16_to_cpu(drv_map->raidMap.ldCount);
 296
 297         /*Convert Raid capability values to CPU arch */
 298         for (ldCount = 0; ldCount < num_lds; ldCount++) {
 299                 ld = MR_TargetIdToLdGet(ldCount, drv_map);
 300                 raid = MR_LdRaidGet(ld, drv_map);
 301                 le32_to_cpus((u32 *)&raid->capability);
 302         }
 303
 304         return 1;
 305 }
 306
 307 u32 MR_GetSpanBlock(u32 ld, u64 row, u64 *span_blk,
 308                     struct MR_DRV_RAID_MAP_ALL *map)
 309 {
 310         struct MR_SPAN_BLOCK_INFO *pSpanBlock = MR_LdSpanInfoGet(ld, map);
 311         struct MR_QUAD_ELEMENT    *quad;
 312         struct MR_LD_RAID         *raid = MR_LdRaidGet(ld, map);
 313         u32                span, j;
 314
 315         for (span = 0; span < raid->spanDepth; span++, pSpanBlock++) {
 316
 317                 for (j = 0; j < le32_to_cpu(pSpanBlock->block_span_info.noElements); j++) {
 318                         quad = &pSpanBlock->block_span_info.quad[j];
 319
 320                         if (le32_to_cpu(quad->diff) == 0)
 321                                 return SPAN_INVALID;
 322                         if (le64_to_cpu(quad->logStart) <= row && row <=
 323                                 le64_to_cpu(quad->logEnd) && (mega_mod64(row - le64_to_cpu(quad->logStart),
 324                                 le32_to_cpu(quad->diff))) == 0) {
 325                                 if (span_blk != NULL) {
 326                                         u64  blk, debugBlk;
 327                                         blk =  mega_div64_32((row-le64_to_cpu(quad->logStart)), le32_to_cpu(quad->diff));
 328                                         debugBlk = blk;
 329
 330                                         blk = (blk + le64_to_cpu(quad->offsetInSpan)) << raid->stripeShift;
 331                                         *span_blk = blk;
 332                                 }
 333                                 return span;
 334                         }
 335                 }
 336         }
 337         return SPAN_INVALID;
 338 }
 339
 340 /*
 341 ******************************************************************************
 342 *
 343 * Function to print info about span set created in driver from FW raid map
 344 *
 345 * Inputs :
 346 * map    - LD map
 347 * ldSpanInfo - ldSpanInfo per HBA instance
 348 */
 349 #if SPAN_DEBUG
 350 static int getSpanInfo(struct MR_DRV_RAID_MAP_ALL *map,
 351         PLD_SPAN_INFO ldSpanInfo)
 352 {
 353
 354         u8   span;
 355         u32    element;
 356         struct MR_LD_RAID *raid;
 357         LD_SPAN_SET *span_set;
 358         struct MR_QUAD_ELEMENT    *quad;
 359         int ldCount;
 360         u16 ld;
 361
 362         for (ldCount = 0; ldCount < MAX_LOGICAL_DRIVES_EXT; ldCount++) {
 363                 ld = MR_TargetIdToLdGet(ldCount, map);
 364                         if (ld >= (MAX_LOGICAL_DRIVES_EXT - 1))
 365                                 continue;
 366                 raid = MR_LdRaidGet(ld, map);
 367                 dev_dbg(&instance->pdev->dev, "LD %x: span_depth=%x\n",
 368                         ld, raid->spanDepth);
 369                 for (span = 0; span < raid->spanDepth; span++)
 370                         dev_dbg(&instance->pdev->dev, "Span=%x,"
 371                         " number of quads=%x\n", span,
 372                         le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
 373                         block_span_info.noElements));
 374                 for (element = 0; element < MAX_QUAD_DEPTH; element++) {
 375                         span_set = &(ldSpanInfo[ld].span_set[element]);
 376                         if (span_set->span_row_data_width == 0)
 377                                 break;
 378
 379                         dev_dbg(&instance->pdev->dev, "Span Set %x:"
 380                                 "width=%x, diff=%x\n", element,
 381                                 (unsigned int)span_set->span_row_data_width,
 382                                 (unsigned int)span_set->diff);
 383                         dev_dbg(&instance->pdev->dev, "logical LBA"
 384                                 "start=0x%08lx, end=0x%08lx\n",
 385                                 (long unsigned int)span_set->log_start_lba,
 386                                 (long unsigned int)span_set->log_end_lba);
 387                         dev_dbg(&instance->pdev->dev, "span row start=0x%08lx,"
 388                                 " end=0x%08lx\n",
 389                                 (long unsigned int)span_set->span_row_start,
 390                                 (long unsigned int)span_set->span_row_end);
 391                         dev_dbg(&instance->pdev->dev, "data row start=0x%08lx,"
 392                                 " end=0x%08lx\n",
 393                                 (long unsigned int)span_set->data_row_start,
 394                                 (long unsigned int)span_set->data_row_end);
 395                         dev_dbg(&instance->pdev->dev, "data strip start=0x%08lx,"
 396                                 " end=0x%08lx\n",
 397                                 (long unsigned int)span_set->data_strip_start,
 398                                 (long unsigned int)span_set->data_strip_end);
 399
 400                         for (span = 0; span < raid->spanDepth; span++) {
 401                                 if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
 402                                         block_span_info.noElements) >=
 403                                         element + 1) {
 404                                         quad = &map->raidMap.ldSpanMap[ld].
 405                                                 spanBlock[span].block_span_info.
 406                                                 quad[element];
 407                                 dev_dbg(&instance->pdev->dev, "Span=%x,"
 408                                         "Quad=%x, diff=%x\n", span,
 409                                         element, le32_to_cpu(quad->diff));
 410                                 dev_dbg(&instance->pdev->dev,
 411                                         "offset_in_span=0x%08lx\n",
 412                                         (long unsigned int)le64_to_cpu(quad->offsetInSpan));
 413                                 dev_dbg(&instance->pdev->dev,
 414                                         "logical start=0x%08lx, end=0x%08lx\n",
 415                                         (long unsigned int)le64_to_cpu(quad->logStart),
 416                                         (long unsigned int)le64_to_cpu(quad->logEnd));
 417                                 }
 418                         }
 419                 }
 420         }
 421         return 0;
 422 }
 423 #endif
 424
 425 /*
 426 ******************************************************************************
 427 *
 428 * This routine calculates the Span block for given row using spanset.
 429 *
 430 * Inputs :
 431 *    instance - HBA instance
 432 *    ld   - Logical drive number
 433 *    row        - Row number
 434 *    map    - LD map
 435 *
 436 * Outputs :
 437 *
 438 *    span          - Span number
 439 *    block         - Absolute Block number in the physical disk
 440 *    div_error     - Devide error code.
 441 */
 442
 443 u32 mr_spanset_get_span_block(struct megasas_instance *instance,
 444                 u32 ld, u64 row, u64 *span_blk, struct MR_DRV_RAID_MAP_ALL *map)
 445 {
 446         struct fusion_context *fusion = instance->ctrl_context;
 447         struct MR_LD_RAID         *raid = MR_LdRaidGet(ld, map);
 448         LD_SPAN_SET *span_set;
 449         struct MR_QUAD_ELEMENT    *quad;
 450         u32    span, info;
 451         PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span;
 452
 453         for (info = 0; info < MAX_QUAD_DEPTH; info++) {
 454                 span_set = &(ldSpanInfo[ld].span_set[info]);
 455
 456                 if (span_set->span_row_data_width == 0)
 457                         break;
 458
 459                 if (row > span_set->data_row_end)
 460                         continue;
 461
 462                 for (span = 0; span < raid->spanDepth; span++)
 463                         if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
 464                                 block_span_info.noElements) >= info+1) {
 465                                 quad = &map->raidMap.ldSpanMap[ld].
 466                                         spanBlock[span].
 467                                         block_span_info.quad[info];
 468                                 if (le32_to_cpu(quad->diff) == 0)
 469                                         return SPAN_INVALID;
 470                                 if (le64_to_cpu(quad->logStart) <= row  &&
 471                                         row <= le64_to_cpu(quad->logEnd)  &&
 472                                         (mega_mod64(row - le64_to_cpu(quad->logStart),
 473                                                 le32_to_cpu(quad->diff))) == 0) {
 474                                         if (span_blk != NULL) {
 475                                                 u64  blk;
 476                                                 blk = mega_div64_32
 477                                                     ((row - le64_to_cpu(quad->logStart)),
 478                                                     le32_to_cpu(quad->diff));
 479                                                 blk = (blk + le64_to_cpu(quad->offsetInSpan))
 480                                                          << raid->stripeShift;
 481                                                 *span_blk = blk;
 482                                         }
 483                                         return span;
 484                                 }
 485                         }
 486         }
 487         return SPAN_INVALID;
 488 }
 489
 490 /*
 491 ******************************************************************************
 492 *
 493 * This routine calculates the row for given strip using spanset.
 494 *
 495 * Inputs :
 496 *    instance - HBA instance
 497 *    ld   - Logical drive number
 498 *    Strip        - Strip
 499 *    map    - LD map
 500 *
 501 * Outputs :
 502 *
 503 *    row         - row associated with strip
 504 */
 505
 506 static u64  get_row_from_strip(struct megasas_instance *instance,
 507         u32 ld, u64 strip, struct MR_DRV_RAID_MAP_ALL *map)
 508 {
 509         struct fusion_context *fusion = instance->ctrl_context;
 510         struct MR_LD_RAID       *raid = MR_LdRaidGet(ld, map);
 511         LD_SPAN_SET     *span_set;
 512         PLD_SPAN_INFO   ldSpanInfo = fusion->log_to_span;
 513         u32             info, strip_offset, span, span_offset;
 514         u64             span_set_Strip, span_set_Row, retval;
 515
 516         for (info = 0; info < MAX_QUAD_DEPTH; info++) {
 517                 span_set = &(ldSpanInfo[ld].span_set[info]);
 518
 519                 if (span_set->span_row_data_width == 0)
 520                         break;
 521                 if (strip > span_set->data_strip_end)
 522                         continue;
 523
 524                 span_set_Strip = strip - span_set->data_strip_start;
 525                 strip_offset = mega_mod64(span_set_Strip,
 526                                 span_set->span_row_data_width);
 527                 span_set_Row = mega_div64_32(span_set_Strip,
 528                                 span_set->span_row_data_width) * span_set->diff;
 529                 for (span = 0, span_offset = 0; span < raid->spanDepth; span++)
 530                         if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
 531                                 block_span_info.noElements) >= info+1) {
 532                                 if (strip_offset >=
 533                                         span_set->strip_offset[span])
 534                                         span_offset++;
 535                                 else
 536                                         break;
 537                         }
 538 #if SPAN_DEBUG
 539                 dev_info(&instance->pdev->dev, "Strip 0x%llx,"
 540                         "span_set_Strip 0x%llx, span_set_Row 0x%llx"
 541                         "data width 0x%llx span offset 0x%x\n", strip,
 542                         (unsigned long long)span_set_Strip,
 543                         (unsigned long long)span_set_Row,
 544                         (unsigned long long)span_set->span_row_data_width,
 545                         span_offset);
 546                 dev_info(&instance->pdev->dev, "For strip 0x%llx"
 547                         "row is 0x%llx\n", strip,
 548                         (unsigned long long) span_set->data_row_start +
 549                         (unsigned long long) span_set_Row + (span_offset - 1));
 550 #endif
 551                 retval = (span_set->data_row_start + span_set_Row +
 552                                 (span_offset - 1));
 553                 return retval;
 554         }
 555         return -1LLU;
 556 }
 557
 558
 559 /*
 560 ******************************************************************************
 561 *
 562 * This routine calculates the Start Strip for given row using spanset.
 563 *
 564 * Inputs :
 565 *    instance - HBA instance
 566 *    ld   - Logical drive number
 567 *    row        - Row number
 568 *    map    - LD map
 569 *
 570 * Outputs :
 571 *
 572 *    Strip         - Start strip associated with row
 573 */
 574
 575 static u64 get_strip_from_row(struct megasas_instance *instance,
 576                 u32 ld, u64 row, struct MR_DRV_RAID_MAP_ALL *map)
 577 {
 578         struct fusion_context *fusion = instance->ctrl_context;
 579         struct MR_LD_RAID         *raid = MR_LdRaidGet(ld, map);
 580         LD_SPAN_SET *span_set;
 581         struct MR_QUAD_ELEMENT    *quad;
 582         PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span;
 583         u32    span, info;
 584         u64  strip;
 585
 586         for (info = 0; info < MAX_QUAD_DEPTH; info++) {
 587                 span_set = &(ldSpanInfo[ld].span_set[info]);
 588
 589                 if (span_set->span_row_data_width == 0)
 590                         break;
 591                 if (row > span_set->data_row_end)
 592                         continue;
 593
 594                 for (span = 0; span < raid->spanDepth; span++)
 595                         if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
 596                                 block_span_info.noElements) >= info+1) {
 597                                 quad = &map->raidMap.ldSpanMap[ld].
 598                                         spanBlock[span].block_span_info.quad[info];
 599                                 if (le64_to_cpu(quad->logStart) <= row  &&
 600                                         row <= le64_to_cpu(quad->logEnd)  &&
 601                                         mega_mod64((row - le64_to_cpu(quad->logStart)),
 602                                         le32_to_cpu(quad->diff)) == 0) {
 603                                         strip = mega_div64_32
 604                                                 (((row - span_set->data_row_start)
 605                                                         - le64_to_cpu(quad->logStart)),
 606                                                         le32_to_cpu(quad->diff));
 607                                         strip *= span_set->span_row_data_width;
 608                                         strip += span_set->data_strip_start;
 609                                         strip += span_set->strip_offset[span];
 610                                         return strip;
 611                                 }
 612                         }
 613         }
 614         dev_err(&instance->pdev->dev, "get_strip_from_row"
 615                 "returns invalid strip for ld=%x, row=%lx\n",
 616                 ld, (long unsigned int)row);
 617         return -1;
 618 }
 619
 620 /*
 621 ******************************************************************************
 622 *
 623 * This routine calculates the Physical Arm for given strip using spanset.
 624 *
 625 * Inputs :
 626 *    instance - HBA instance
 627 *    ld   - Logical drive number
 628 *    strip      - Strip
 629 *    map    - LD map
 630 *
 631 * Outputs :
 632 *
 633 *    Phys Arm         - Phys Arm associated with strip
 634 */
 635
 636 static u32 get_arm_from_strip(struct megasas_instance *instance,
 637         u32 ld, u64 strip, struct MR_DRV_RAID_MAP_ALL *map)
 638 {
 639         struct fusion_context *fusion = instance->ctrl_context;
 640         struct MR_LD_RAID         *raid = MR_LdRaidGet(ld, map);
 641         LD_SPAN_SET *span_set;
 642         PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span;
 643         u32    info, strip_offset, span, span_offset, retval;
 644
 645         for (info = 0 ; info < MAX_QUAD_DEPTH; info++) {
 646                 span_set = &(ldSpanInfo[ld].span_set[info]);
 647
 648                 if (span_set->span_row_data_width == 0)
 649                         break;
 650                 if (strip > span_set->data_strip_end)
 651                         continue;
 652
 653                 strip_offset = (uint)mega_mod64
 654                                 ((strip - span_set->data_strip_start),
 655                                 span_set->span_row_data_width);
 656
 657                 for (span = 0, span_offset = 0; span < raid->spanDepth; span++)
 658                         if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
 659                                 block_span_info.noElements) >= info+1) {
 660                                 if (strip_offset >=
 661                                         span_set->strip_offset[span])
 662                                         span_offset =
 663                                                 span_set->strip_offset[span];
 664                                 else
 665                                         break;
 666                         }
 667 #if SPAN_DEBUG
 668                 dev_info(&instance->pdev->dev, "get_arm_from_strip:"
 669                         "for ld=0x%x strip=0x%lx arm is  0x%x\n", ld,
 670                         (long unsigned int)strip, (strip_offset - span_offset));
 671 #endif
 672                 retval = (strip_offset - span_offset);
 673                 return retval;
 674         }
 675
 676         dev_err(&instance->pdev->dev, "get_arm_from_strip"
 677                 "returns invalid arm for ld=%x strip=%lx\n",
 678                 ld, (long unsigned int)strip);
 679
 680         return -1;
 681 }
 682
 683 /* This Function will return Phys arm */
 684 u8 get_arm(struct megasas_instance *instance, u32 ld, u8 span, u64 stripe,
 685                 struct MR_DRV_RAID_MAP_ALL *map)
 686 {
 687         struct MR_LD_RAID  *raid = MR_LdRaidGet(ld, map);
 688         /* Need to check correct default value */
 689         u32    arm = 0;
 690
 691         switch (raid->level) {
 692         case 0:
 693         case 5:
 694         case 6:
 695                 arm = mega_mod64(stripe, SPAN_ROW_SIZE(map, ld, span));
 696                 break;
 697         case 1:
 698                 /* start with logical arm */
 699                 arm = get_arm_from_strip(instance, ld, stripe, map);
 700                 if (arm != -1U)
 701                         arm *= 2;
 702                 break;
 703         }
 704
 705         return arm;
 706 }
 707
 708
 709 /*
 710 ******************************************************************************
 711 *
 712 * This routine calculates the arm, span and block for the specified stripe and
 713 * reference in stripe using spanset
 714 *
 715 * Inputs :
 716 *
 717 *    ld   - Logical drive number
 718 *    stripRow        - Stripe number
 719 *    stripRef    - Reference in stripe
 720 *
 721 * Outputs :
 722 *
 723 *    span          - Span number
 724 *    block         - Absolute Block number in the physical disk
 725 */
 726 static u8 mr_spanset_get_phy_params(struct megasas_instance *instance, u32 ld,
 727                 u64 stripRow, u16 stripRef, struct IO_REQUEST_INFO *io_info,
 728                 struct RAID_CONTEXT *pRAID_Context,
 729                 struct MR_DRV_RAID_MAP_ALL *map)
 730 {
 731         struct MR_LD_RAID  *raid = MR_LdRaidGet(ld, map);
 732         u32     pd, arRef;
 733         u8      physArm, span;
 734         u64     row;
 735         u8      retval = TRUE;
 736         u8      do_invader = 0;
 737         u64     *pdBlock = &io_info->pdBlock;
 738         u16     *pDevHandle = &io_info->devHandle;
 739         u32     logArm, rowMod, armQ, arm;
 740
 741         if ((instance->pdev->device == PCI_DEVICE_ID_LSI_INVADER ||
 742                 instance->pdev->device == PCI_DEVICE_ID_LSI_FURY))
 743                 do_invader = 1;
 744
 745         /*Get row and span from io_info for Uneven Span IO.*/
 746         row         = io_info->start_row;
 747         span        = io_info->start_span;
 748
 749
 750         if (raid->level == 6) {
 751                 logArm = get_arm_from_strip(instance, ld, stripRow, map);
 752                 if (logArm == -1U)
 753                         return FALSE;
 754                 rowMod = mega_mod64(row, SPAN_ROW_SIZE(map, ld, span));
 755                 armQ = SPAN_ROW_SIZE(map, ld, span) - 1 - rowMod;
 756                 arm = armQ + 1 + logArm;
 757                 if (arm >= SPAN_ROW_SIZE(map, ld, span))
 758                         arm -= SPAN_ROW_SIZE(map, ld, span);
 759                 physArm = (u8)arm;
 760         } else
 761                 /* Calculate the arm */
 762                 physArm = get_arm(instance, ld, span, stripRow, map);
 763         if (physArm == 0xFF)
 764                 return FALSE;
 765
 766         arRef       = MR_LdSpanArrayGet(ld, span, map);
 767         pd          = MR_ArPdGet(arRef, physArm, map);
 768
 769         if (pd != MR_PD_INVALID)
 770                 *pDevHandle = MR_PdDevHandleGet(pd, map);
 771         else {
 772                 *pDevHandle = MR_PD_INVALID;
 773                 if ((raid->level >= 5) &&
 774                         (!do_invader  || (do_invader &&
 775                         (raid->regTypeReqOnRead != REGION_TYPE_UNUSED))))
 776                         pRAID_Context->regLockFlags = REGION_TYPE_EXCLUSIVE;
 777                 else if (raid->level == 1) {
 778                         pd = MR_ArPdGet(arRef, physArm + 1, map);
 779                         if (pd != MR_PD_INVALID)
 780                                 *pDevHandle = MR_PdDevHandleGet(pd, map);
 781                 }
 782         }
 783
 784         *pdBlock += stripRef + le64_to_cpu(MR_LdSpanPtrGet(ld, span, map)->startBlk);
 785         pRAID_Context->spanArm = (span << RAID_CTX_SPANARM_SPAN_SHIFT) |
 786                                         physArm;
 787         io_info->span_arm = pRAID_Context->spanArm;
 788         return retval;
 789 }
 790
 791 /*
 792 ******************************************************************************
 793 *
 794 * This routine calculates the arm, span and block for the specified stripe and
 795 * reference in stripe.
 796 *
 797 * Inputs :
 798 *
 799 *    ld   - Logical drive number
 800 *    stripRow        - Stripe number
 801 *    stripRef    - Reference in stripe
 802 *
 803 * Outputs :
 804 *
 805 *    span          - Span number
 806 *    block         - Absolute Block number in the physical disk
 807 */
 808 u8 MR_GetPhyParams(struct megasas_instance *instance, u32 ld, u64 stripRow,
 809                 u16 stripRef, struct IO_REQUEST_INFO *io_info,
 810                 struct RAID_CONTEXT *pRAID_Context,
 811                 struct MR_DRV_RAID_MAP_ALL *map)
 812 {
 813         struct MR_LD_RAID  *raid = MR_LdRaidGet(ld, map);
 814         u32         pd, arRef;
 815         u8          physArm, span;
 816         u64         row;
 817         u8          retval = TRUE;
 818         u8          do_invader = 0;
 819         u64         *pdBlock = &io_info->pdBlock;
 820         u16         *pDevHandle = &io_info->devHandle;
 821
 822         if ((instance->pdev->device == PCI_DEVICE_ID_LSI_INVADER ||
 823                 instance->pdev->device == PCI_DEVICE_ID_LSI_FURY))
 824                 do_invader = 1;
 825
 826         row =  mega_div64_32(stripRow, raid->rowDataSize);
 827
 828         if (raid->level == 6) {
 829                 /* logical arm within row */
 830                 u32 logArm =  mega_mod64(stripRow, raid->rowDataSize);
 831                 u32 rowMod, armQ, arm;
 832
 833                 if (raid->rowSize == 0)
 834                         return FALSE;
 835                 /* get logical row mod */
 836                 rowMod = mega_mod64(row, raid->rowSize);
 837                 armQ = raid->rowSize-1-rowMod; /* index of Q drive */
 838                 arm = armQ+1+logArm; /* data always logically follows Q */
 839                 if (arm >= raid->rowSize) /* handle wrap condition */
 840                         arm -= raid->rowSize;
 841                 physArm = (u8)arm;
 842         } else  {
 843                 if (raid->modFactor == 0)
 844                         return FALSE;
 845                 physArm = MR_LdDataArmGet(ld,  mega_mod64(stripRow,
 846                                                           raid->modFactor),
 847                                           map);
 848         }
 849
 850         if (raid->spanDepth == 1) {
 851                 span = 0;
 852                 *pdBlock = row << raid->stripeShift;
 853         } else {
 854                 span = (u8)MR_GetSpanBlock(ld, row, pdBlock, map);
 855                 if (span == SPAN_INVALID)
 856                         return FALSE;
 857         }
 858
 859         /* Get the array on which this span is present */
 860         arRef       = MR_LdSpanArrayGet(ld, span, map);
 861         pd          = MR_ArPdGet(arRef, physArm, map); /* Get the pd */
 862
 863         if (pd != MR_PD_INVALID)
 864                 /* Get dev handle from Pd. */
 865                 *pDevHandle = MR_PdDevHandleGet(pd, map);
 866         else {
 867                 *pDevHandle = MR_PD_INVALID; /* set dev handle as invalid. */
 868                 if ((raid->level >= 5) &&
 869                         (!do_invader  || (do_invader &&
 870                         (raid->regTypeReqOnRead != REGION_TYPE_UNUSED))))
 871                         pRAID_Context->regLockFlags = REGION_TYPE_EXCLUSIVE;
 872                 else if (raid->level == 1) {
 873                         /* Get alternate Pd. */
 874                         pd = MR_ArPdGet(arRef, physArm + 1, map);
 875                         if (pd != MR_PD_INVALID)
 876                                 /* Get dev handle from Pd */
 877                                 *pDevHandle = MR_PdDevHandleGet(pd, map);
 878                 }
 879         }
 880
 881         *pdBlock += stripRef + le64_to_cpu(MR_LdSpanPtrGet(ld, span, map)->startBlk);
 882         pRAID_Context->spanArm = (span << RAID_CTX_SPANARM_SPAN_SHIFT) |
 883                 physArm;
 884         io_info->span_arm = pRAID_Context->spanArm;
 885         return retval;
 886 }
 887
 888 /*
 889 ******************************************************************************
 890 *
 891 * MR_BuildRaidContext function
 892 *
 893 * This function will initiate command processing.  The start/end row and strip
 894 * information is calculated then the lock is acquired.
 895 * This function will return 0 if region lock was acquired OR return num strips
 896 */
 897 u8
 898 MR_BuildRaidContext(struct megasas_instance *instance,
 899                     struct IO_REQUEST_INFO *io_info,
 900                     struct RAID_CONTEXT *pRAID_Context,
 901                     struct MR_DRV_RAID_MAP_ALL *map, u8 **raidLUN)
 902 {
 903         struct MR_LD_RAID  *raid;
 904         u32         ld, stripSize, stripe_mask;
 905         u64         endLba, endStrip, endRow, start_row, start_strip;
 906         u64         regStart;
 907         u32         regSize;
 908         u8          num_strips, numRows;
 909         u16         ref_in_start_stripe, ref_in_end_stripe;
 910         u64         ldStartBlock;
 911         u32         numBlocks, ldTgtId;
 912         u8          isRead;
 913         u8          retval = 0;
 914         u8          startlba_span = SPAN_INVALID;
 915         u64 *pdBlock = &io_info->pdBlock;
 916
 917         ldStartBlock = io_info->ldStartBlock;
 918         numBlocks = io_info->numBlocks;
 919         ldTgtId = io_info->ldTgtId;
 920         isRead = io_info->isRead;
 921         io_info->IoforUnevenSpan = 0;
 922         io_info->start_span     = SPAN_INVALID;
 923
 924         ld = MR_TargetIdToLdGet(ldTgtId, map);
 925         raid = MR_LdRaidGet(ld, map);
 926
 927         /*
 928          * if rowDataSize @RAID map and spanRowDataSize @SPAN INFO are zero
 929          * return FALSE
 930          */
 931         if (raid->rowDataSize == 0) {
 932                 if (MR_LdSpanPtrGet(ld, 0, map)->spanRowDataSize == 0)
 933                         return FALSE;
 934                 else if (instance->UnevenSpanSupport) {
 935                         io_info->IoforUnevenSpan = 1;
 936                 } else {
 937                         dev_info(&instance->pdev->dev,
 938                                 "raid->rowDataSize is 0, but has SPAN[0]"
 939                                 "rowDataSize = 0x%0x,"
 940                                 "but there is _NO_ UnevenSpanSupport\n",
 941                                 MR_LdSpanPtrGet(ld, 0, map)->spanRowDataSize);
 942                         return FALSE;
 943                 }
 944         }
 945
 946         stripSize = 1 << raid->stripeShift;
 947         stripe_mask = stripSize-1;
 948
 949
 950         /*
 951          * calculate starting row and stripe, and number of strips and rows
 952          */
 953         start_strip         = ldStartBlock >> raid->stripeShift;
 954         ref_in_start_stripe = (u16)(ldStartBlock & stripe_mask);
 955         endLba              = ldStartBlock + numBlocks - 1;
 956         ref_in_end_stripe   = (u16)(endLba & stripe_mask);
 957         endStrip            = endLba >> raid->stripeShift;
 958         num_strips          = (u8)(endStrip - start_strip + 1); /* End strip */
 959
 960         if (io_info->IoforUnevenSpan) {
 961                 start_row = get_row_from_strip(instance, ld, start_strip, map);
 962                 endRow    = get_row_from_strip(instance, ld, endStrip, map);
 963                 if (start_row == -1ULL || endRow == -1ULL) {
 964                         dev_info(&instance->pdev->dev, "return from %s %d."
 965                                 "Send IO w/o region lock.\n",
 966                                 __func__, __LINE__);
 967                         return FALSE;
 968                 }
 969
 970                 if (raid->spanDepth == 1) {
 971                         startlba_span = 0;
 972                         *pdBlock = start_row << raid->stripeShift;
 973                 } else
 974                         startlba_span = (u8)mr_spanset_get_span_block(instance,
 975                                                 ld, start_row, pdBlock, map);
 976                 if (startlba_span == SPAN_INVALID) {
 977                         dev_info(&instance->pdev->dev, "return from %s %d"
 978                                 "for row 0x%llx,start strip %llx"
 979                                 "endSrip %llx\n", __func__, __LINE__,
 980                                 (unsigned long long)start_row,
 981                                 (unsigned long long)start_strip,
 982                                 (unsigned long long)endStrip);
 983                         return FALSE;
 984                 }
 985                 io_info->start_span     = startlba_span;
 986                 io_info->start_row      = start_row;
 987 #if SPAN_DEBUG
 988                 dev_dbg(&instance->pdev->dev, "Check Span number from %s %d"
 989                         "for row 0x%llx, start strip 0x%llx end strip 0x%llx"
 990                         " span 0x%x\n", __func__, __LINE__,
 991                         (unsigned long long)start_row,
 992                         (unsigned long long)start_strip,
 993                         (unsigned long long)endStrip, startlba_span);
 994                 dev_dbg(&instance->pdev->dev, "start_row 0x%llx endRow 0x%llx"
 995                         "Start span 0x%x\n", (unsigned long long)start_row,
 996                         (unsigned long long)endRow, startlba_span);
 997 #endif
 998         } else {
 999                 start_row = mega_div64_32(start_strip, raid->rowDataSize);
1000                 endRow    = mega_div64_32(endStrip, raid->rowDataSize);
1001         }
1002         numRows = (u8)(endRow - start_row + 1);
1003
1004         /*
1005          * calculate region info.
1006          */
1007
1008         /* assume region is at the start of the first row */
1009         regStart            = start_row << raid->stripeShift;
1010         /* assume this IO needs the full row - we'll adjust if not true */
1011         regSize             = stripSize;
1012
1013         /* Check if we can send this I/O via FastPath */
1014         if (raid->capability.fpCapable) {
1015                 if (isRead)
1016                         io_info->fpOkForIo = (raid->capability.fpReadCapable &&
1017                                               ((num_strips == 1) ||
1018                                                raid->capability.
1019                                                fpReadAcrossStripe));
1020                 else
1021                         io_info->fpOkForIo = (raid->capability.fpWriteCapable &&
1022                                               ((num_strips == 1) ||
1023                                                raid->capability.
1024                                                fpWriteAcrossStripe));
1025         } else
1026                 io_info->fpOkForIo = FALSE;
1027
1028         if (numRows == 1) {
1029                 /* single-strip IOs can always lock only the data needed */
1030                 if (num_strips == 1) {
1031                         regStart += ref_in_start_stripe;
1032                         regSize = numBlocks;
1033                 }
1034                 /* multi-strip IOs always need to full stripe locked */
1035         } else if (io_info->IoforUnevenSpan == 0) {
1036                 /*
1037                  * For Even span region lock optimization.
1038                  * If the start strip is the last in the start row
1039                  */
1040                 if (start_strip == (start_row + 1) * raid->rowDataSize - 1) {
1041                         regStart += ref_in_start_stripe;
1042                         /* initialize count to sectors from startref to end
1043                            of strip */
1044                         regSize = stripSize - ref_in_start_stripe;
1045                 }
1046
1047                 /* add complete rows in the middle of the transfer */
1048                 if (numRows > 2)
1049                         regSize += (numRows-2) << raid->stripeShift;
1050
1051                 /* if IO ends within first strip of last row*/
1052                 if (endStrip == endRow*raid->rowDataSize)
1053                         regSize += ref_in_end_stripe+1;
1054                 else
1055                         regSize += stripSize;
1056         } else {
1057                 /*
1058                  * For Uneven span region lock optimization.
1059                  * If the start strip is the last in the start row
1060                  */
1061                 if (start_strip == (get_strip_from_row(instance, ld, start_row, map) +
1062                                 SPAN_ROW_DATA_SIZE(map, ld, startlba_span) - 1)) {
1063                         regStart += ref_in_start_stripe;
1064                         /* initialize count to sectors from
1065                          * startRef to end of strip
1066                          */
1067                         regSize = stripSize - ref_in_start_stripe;
1068                 }
1069                 /* Add complete rows in the middle of the transfer*/
1070
1071                 if (numRows > 2)
1072                         /* Add complete rows in the middle of the transfer*/
1073                         regSize += (numRows-2) << raid->stripeShift;
1074
1075                 /* if IO ends within first strip of last row */
1076                 if (endStrip == get_strip_from_row(instance, ld, endRow, map))
1077                         regSize += ref_in_end_stripe + 1;
1078                 else
1079                         regSize += stripSize;
1080         }
1081
1082         pRAID_Context->timeoutValue =
1083                 cpu_to_le16(raid->fpIoTimeoutForLd ?
1084                             raid->fpIoTimeoutForLd :
1085                             map->raidMap.fpPdIoTimeoutSec);
1086         if ((instance->pdev->device == PCI_DEVICE_ID_LSI_INVADER) ||
1087                 (instance->pdev->device == PCI_DEVICE_ID_LSI_FURY))
1088                 pRAID_Context->regLockFlags = (isRead) ?
1089                         raid->regTypeReqOnRead : raid->regTypeReqOnWrite;
1090         else
1091                 pRAID_Context->regLockFlags = (isRead) ?
1092                         REGION_TYPE_SHARED_READ : raid->regTypeReqOnWrite;
1093         pRAID_Context->VirtualDiskTgtId = raid->targetId;
1094         pRAID_Context->regLockRowLBA    = cpu_to_le64(regStart);
1095         pRAID_Context->regLockLength    = cpu_to_le32(regSize);
1096         pRAID_Context->configSeqNum     = raid->seqNum;
1097         /* save pointer to raid->LUN array */
1098         *raidLUN = raid->LUN;
1099
1100
1101         /*Get Phy Params only if FP capable, or else leave it to MR firmware
1102           to do the calculation.*/
1103         if (io_info->fpOkForIo) {
1104                 retval = io_info->IoforUnevenSpan ?
1105                                 mr_spanset_get_phy_params(instance, ld,
1106                                         start_strip, ref_in_start_stripe,
1107                                         io_info, pRAID_Context, map) :
1108                                 MR_GetPhyParams(instance, ld, start_strip,
1109                                         ref_in_start_stripe, io_info,
1110                                         pRAID_Context, map);
1111                 /* If IO on an invalid Pd, then FP is not possible.*/
1112                 if (io_info->devHandle == MR_PD_INVALID)
1113                         io_info->fpOkForIo = FALSE;
1114                 return retval;
1115         } else if (isRead) {
1116                 uint stripIdx;
1117                 for (stripIdx = 0; stripIdx < num_strips; stripIdx++) {
1118                         retval = io_info->IoforUnevenSpan ?
1119                                 mr_spanset_get_phy_params(instance, ld,
1120                                     start_strip + stripIdx,
1121                                     ref_in_start_stripe, io_info,
1122                                     pRAID_Context, map) :
1123                                 MR_GetPhyParams(instance, ld,
1124                                     start_strip + stripIdx, ref_in_start_stripe,
1125                                     io_info, pRAID_Context, map);
1126                         if (!retval)
1127                                 return TRUE;
1128                 }
1129         }
1130
1131 #if SPAN_DEBUG
1132         /* Just for testing what arm we get for strip.*/
1133         if (io_info->IoforUnevenSpan)
1134                 get_arm_from_strip(instance, ld, start_strip, map);
1135 #endif
1136         return TRUE;
1137 }
1138
1139 /*
1140 ******************************************************************************
1141 *
1142 * This routine pepare spanset info from Valid Raid map and store it into
1143 * local copy of ldSpanInfo per instance data structure.
1144 *
1145 * Inputs :
1146 * map    - LD map
1147 * ldSpanInfo - ldSpanInfo per HBA instance
1148 *
1149 */
1150 void mr_update_span_set(struct MR_DRV_RAID_MAP_ALL *map,
1151         PLD_SPAN_INFO ldSpanInfo)
1152 {
1153         u8   span, count;
1154         u32  element, span_row_width;
1155         u64  span_row;
1156         struct MR_LD_RAID *raid;
1157         LD_SPAN_SET *span_set, *span_set_prev;
1158         struct MR_QUAD_ELEMENT    *quad;
1159         int ldCount;
1160         u16 ld;
1161
1162
1163         for (ldCount = 0; ldCount < MAX_LOGICAL_DRIVES_EXT; ldCount++) {
1164                 ld = MR_TargetIdToLdGet(ldCount, map);
1165                 if (ld >= (MAX_LOGICAL_DRIVES_EXT - 1))
1166                         continue;
1167                 raid = MR_LdRaidGet(ld, map);
1168                 for (element = 0; element < MAX_QUAD_DEPTH; element++) {
1169                         for (span = 0; span < raid->spanDepth; span++) {
1170                                 if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
1171                                         block_span_info.noElements) <
1172                                         element + 1)
1173                                         continue;
1174                                 span_set = &(ldSpanInfo[ld].span_set[element]);
1175                                 quad = &map->raidMap.ldSpanMap[ld].
1176                                         spanBlock[span].block_span_info.
1177                                         quad[element];
1178
1179                                 span_set->diff = le32_to_cpu(quad->diff);
1180
1181                                 for (count = 0, span_row_width = 0;
1182                                         count < raid->spanDepth; count++) {
1183                                         if (le32_to_cpu(map->raidMap.ldSpanMap[ld].
1184                                                 spanBlock[count].
1185                                                 block_span_info.
1186                                                 noElements) >= element + 1) {
1187                                                 span_set->strip_offset[count] =
1188                                                         span_row_width;
1189                                                 span_row_width +=
1190                                                         MR_LdSpanPtrGet
1191                                                         (ld, count, map)->spanRowDataSize;
1192                                                 printk(KERN_INFO "megasas:"
1193                                                         "span %x rowDataSize %x\n",
1194                                                         count, MR_LdSpanPtrGet
1195                                                         (ld, count, map)->spanRowDataSize);
1196                                         }
1197                                 }
1198
1199                                 span_set->span_row_data_width = span_row_width;
1200                                 span_row = mega_div64_32(((le64_to_cpu(quad->logEnd) -
1201                                         le64_to_cpu(quad->logStart)) + le32_to_cpu(quad->diff)),
1202                                         le32_to_cpu(quad->diff));
1203
1204                                 if (element == 0) {
1205                                         span_set->log_start_lba = 0;
1206                                         span_set->log_end_lba =
1207                                                 ((span_row << raid->stripeShift)
1208                                                 * span_row_width) - 1;
1209
1210                                         span_set->span_row_start = 0;
1211                                         span_set->span_row_end = span_row - 1;
1212
1213                                         span_set->data_strip_start = 0;
1214                                         span_set->data_strip_end =
1215                                                 (span_row * span_row_width) - 1;
1216
1217                                         span_set->data_row_start = 0;
1218                                         span_set->data_row_end =
1219                                                 (span_row * le32_to_cpu(quad->diff)) - 1;
1220                                 } else {
1221                                         span_set_prev = &(ldSpanInfo[ld].
1222                                                         span_set[element - 1]);
1223                                         span_set->log_start_lba =
1224                                                 span_set_prev->log_end_lba + 1;
1225                                         span_set->log_end_lba =
1226                                                 span_set->log_start_lba +
1227                                                 ((span_row << raid->stripeShift)
1228                                                 * span_row_width) - 1;
1229
1230                                         span_set->span_row_start =
1231                                                 span_set_prev->span_row_end + 1;
1232                                         span_set->span_row_end =
1233                                         span_set->span_row_start + span_row - 1;
1234
1235                                         span_set->data_strip_start =
1236                                         span_set_prev->data_strip_end + 1;
1237                                         span_set->data_strip_end =
1238                                                 span_set->data_strip_start +
1239                                                 (span_row * span_row_width) - 1;
1240
1241                                         span_set->data_row_start =
1242                                                 span_set_prev->data_row_end + 1;
1243                                         span_set->data_row_end =
1244                                                 span_set->data_row_start +
1245                                                 (span_row * le32_to_cpu(quad->diff)) - 1;
1246                                 }
1247                                 break;
1248                 }
1249                 if (span == raid->spanDepth)
1250                         break;
1251             }
1252         }
1253 #if SPAN_DEBUG
1254         getSpanInfo(map, ldSpanInfo);
1255 #endif
1256
1257 }
1258
1259 void mr_update_load_balance_params(struct MR_DRV_RAID_MAP_ALL *drv_map,
1260         struct LD_LOAD_BALANCE_INFO *lbInfo)
1261 {
1262         int ldCount;
1263         u16 ld;
1264         struct MR_LD_RAID *raid;
1265
1266         if (lb_pending_cmds > 128 || lb_pending_cmds < 1)
1267                 lb_pending_cmds = LB_PENDING_CMDS_DEFAULT;
1268
1269         for (ldCount = 0; ldCount < MAX_LOGICAL_DRIVES_EXT; ldCount++) {
1270                 ld = MR_TargetIdToLdGet(ldCount, drv_map);
1271                 if (ld >= MAX_LOGICAL_DRIVES_EXT) {
1272                         lbInfo[ldCount].loadBalanceFlag = 0;
1273                         continue;
1274                 }
1275
1276                 raid = MR_LdRaidGet(ld, drv_map);
1277                 if ((raid->level != 1) ||
1278                         (raid->ldState != MR_LD_STATE_OPTIMAL)) {
1279                         lbInfo[ldCount].loadBalanceFlag = 0;
1280                         continue;
1281                 }
1282                 lbInfo[ldCount].loadBalanceFlag = 1;
1283         }
1284 }
1285
1286 u8 megasas_get_best_arm_pd(struct megasas_instance *instance,
1287         struct LD_LOAD_BALANCE_INFO *lbInfo, struct IO_REQUEST_INFO *io_info)
1288 {
1289         struct fusion_context *fusion;
1290         struct MR_LD_RAID  *raid;
1291         struct MR_DRV_RAID_MAP_ALL *drv_map;
1292         u16     pend0, pend1, ld;
1293         u64     diff0, diff1;
1294         u8      bestArm, pd0, pd1, span, arm;
1295         u32     arRef, span_row_size;
1296
1297         u64 block = io_info->ldStartBlock;
1298         u32 count = io_info->numBlocks;
1299
1300         span = ((io_info->span_arm & RAID_CTX_SPANARM_SPAN_MASK)
1301                         >> RAID_CTX_SPANARM_SPAN_SHIFT);
1302         arm = (io_info->span_arm & RAID_CTX_SPANARM_ARM_MASK);
1303
1304
1305         fusion = instance->ctrl_context;
1306         drv_map = fusion->ld_drv_map[(instance->map_id & 1)];
1307         ld = MR_TargetIdToLdGet(io_info->ldTgtId, drv_map);
1308         raid = MR_LdRaidGet(ld, drv_map);
1309         span_row_size = instance->UnevenSpanSupport ?
1310                         SPAN_ROW_SIZE(drv_map, ld, span) : raid->rowSize;
1311
1312         arRef = MR_LdSpanArrayGet(ld, span, drv_map);
1313         pd0 = MR_ArPdGet(arRef, arm, drv_map);
1314         pd1 = MR_ArPdGet(arRef, (arm + 1) >= span_row_size ?
1315                 (arm + 1 - span_row_size) : arm + 1, drv_map);
1316
1317         /* get the pending cmds for the data and mirror arms */
1318         pend0 = atomic_read(&lbInfo->scsi_pending_cmds[pd0]);
1319         pend1 = atomic_read(&lbInfo->scsi_pending_cmds[pd1]);
1320
1321         /* Determine the disk whose head is nearer to the req. block */
1322         diff0 = ABS_DIFF(block, lbInfo->last_accessed_block[pd0]);
1323         diff1 = ABS_DIFF(block, lbInfo->last_accessed_block[pd1]);
1324         bestArm = (diff0 <= diff1 ? arm : arm ^ 1);
1325
1326         if ((bestArm == arm && pend0 > pend1 + lb_pending_cmds)  ||
1327                         (bestArm != arm && pend1 > pend0 + lb_pending_cmds))
1328                 bestArm ^= 1;
1329
1330         /* Update the last accessed block on the correct pd */
1331         io_info->pd_after_lb = (bestArm == arm) ? pd0 : pd1;
1332         lbInfo->last_accessed_block[io_info->pd_after_lb] = block + count - 1;
1333         io_info->span_arm = (span << RAID_CTX_SPANARM_SPAN_SHIFT) | bestArm;
1334 #if SPAN_DEBUG
1335         if (arm != bestArm)
1336                 dev_dbg(&instance->pdev->dev, "LSI Debug R1 Load balance "
1337                         "occur - span 0x%x arm 0x%x bestArm 0x%x "
1338                         "io_info->span_arm 0x%x\n",
1339                         span, arm, bestArm, io_info->span_arm);
1340 #endif
1341         return io_info->pd_after_lb;
1342 }
1343
1344 u16 get_updated_dev_handle(struct megasas_instance *instance,
1345         struct LD_LOAD_BALANCE_INFO *lbInfo, struct IO_REQUEST_INFO *io_info)
1346 {
1347         u8 arm_pd;
1348         u16 devHandle;
1349         struct fusion_context *fusion;
1350         struct MR_DRV_RAID_MAP_ALL *drv_map;
1351
1352         fusion = instance->ctrl_context;
1353         drv_map = fusion->ld_drv_map[(instance->map_id & 1)];
1354
1355         /* get best new arm (PD ID) */
1356         arm_pd  = megasas_get_best_arm_pd(instance, lbInfo, io_info);
1357         devHandle = MR_PdDevHandleGet(arm_pd, drv_map);
1358         atomic_inc(&lbInfo->scsi_pending_cmds[arm_pd]);
1359         return devHandle;
1360 }