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
  70 #ifdef FALSE
  71 #undef FALSE
  72 #endif
  73 #define FALSE 0
  74
  75 #ifdef TRUE
  76 #undef TRUE
  77 #endif
  78 #define TRUE 1
  79
  80 #define SPAN_DEBUG 0
  81 #define SPAN_ROW_SIZE(map, ld, index_) (MR_LdSpanPtrGet(ld, index_, map)->spanRowSize)
  82 #define SPAN_ROW_DATA_SIZE(map_, ld, index_)   (MR_LdSpanPtrGet(ld, index_, map)->spanRowDataSize)
  83 #define SPAN_INVALID  0xff
  84
  85 /* Prototypes */
  86 static void mr_update_span_set(struct MR_DRV_RAID_MAP_ALL *map,
  87         PLD_SPAN_INFO ldSpanInfo);
  88 static u8 mr_spanset_get_phy_params(struct megasas_instance *instance, u32 ld,
  89         u64 stripRow, u16 stripRef, struct IO_REQUEST_INFO *io_info,
  90         struct RAID_CONTEXT *pRAID_Context, struct MR_DRV_RAID_MAP_ALL *map);
  91 static u64 get_row_from_strip(struct megasas_instance *instance, u32 ld,
  92         u64 strip, struct MR_DRV_RAID_MAP_ALL *map);
  93
  94 u32 mega_mod64(u64 dividend, u32 divisor)
  95 {
  96         u64 d;
  97         u32 remainder;
  98
  99         if (!divisor)
 100                 printk(KERN_ERR "megasas : DIVISOR is zero, in div fn\n");
 101         d = dividend;
 102         remainder = do_div(d, divisor);
 103         return remainder;
 104 }
 105
 106 /**
 107  * @param dividend    : Dividend
 108  * @param divisor    : Divisor
 109  *
 110  * @return quotient
 111  **/
 112 u64 mega_div64_32(uint64_t dividend, uint32_t divisor)
 113 {
 114         u32 remainder;
 115         u64 d;
 116
 117         if (!divisor)
 118                 printk(KERN_ERR "megasas : DIVISOR is zero in mod fn\n");
 119
 120         d = dividend;
 121         remainder = do_div(d, divisor);
 122
 123         return d;
 124 }
 125
 126 struct MR_LD_RAID *MR_LdRaidGet(u32 ld, struct MR_DRV_RAID_MAP_ALL *map)
 127 {
 128         return &map->raidMap.ldSpanMap[ld].ldRaid;
 129 }
 130
 131 static struct MR_SPAN_BLOCK_INFO *MR_LdSpanInfoGet(u32 ld,
 132                                                    struct MR_DRV_RAID_MAP_ALL
 133                                                    *map)
 134 {
 135         return &map->raidMap.ldSpanMap[ld].spanBlock[0];
 136 }
 137
 138 static u8 MR_LdDataArmGet(u32 ld, u32 armIdx, struct MR_DRV_RAID_MAP_ALL *map)
 139 {
 140         return map->raidMap.ldSpanMap[ld].dataArmMap[armIdx];
 141 }
 142
 143 u16 MR_ArPdGet(u32 ar, u32 arm, struct MR_DRV_RAID_MAP_ALL *map)
 144 {
 145         return le16_to_cpu(map->raidMap.arMapInfo[ar].pd[arm]);
 146 }
 147
 148 u16 MR_LdSpanArrayGet(u32 ld, u32 span, struct MR_DRV_RAID_MAP_ALL *map)
 149 {
 150         return le16_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].span.arrayRef);
 151 }
 152
 153 __le16 MR_PdDevHandleGet(u32 pd, struct MR_DRV_RAID_MAP_ALL *map)
 154 {
 155         return map->raidMap.devHndlInfo[pd].curDevHdl;
 156 }
 157
 158 u16 MR_GetLDTgtId(u32 ld, struct MR_DRV_RAID_MAP_ALL *map)
 159 {
 160         return le16_to_cpu(map->raidMap.ldSpanMap[ld].ldRaid.targetId);
 161 }
 162
 163 u8 MR_TargetIdToLdGet(u32 ldTgtId, struct MR_DRV_RAID_MAP_ALL *map)
 164 {
 165         return map->raidMap.ldTgtIdToLd[ldTgtId];
 166 }
 167
 168 static struct MR_LD_SPAN *MR_LdSpanPtrGet(u32 ld, u32 span,
 169                                           struct MR_DRV_RAID_MAP_ALL *map)
 170 {
 171         return &map->raidMap.ldSpanMap[ld].spanBlock[span].span;
 172 }
 173
 174 /*
 175  * This function will Populate Driver Map using firmware raid map
 176  */
 177 void MR_PopulateDrvRaidMap(struct megasas_instance *instance)
 178 {
 179         struct fusion_context *fusion = instance->ctrl_context;
 180         struct MR_FW_RAID_MAP_ALL     *fw_map_old    = NULL;
 181         struct MR_FW_RAID_MAP         *pFwRaidMap    = NULL;
 182         int i;
 183         u16 ld_count;
 184
 185
 186         struct MR_DRV_RAID_MAP_ALL *drv_map =
 187                         fusion->ld_drv_map[(instance->map_id & 1)];
 188         struct MR_DRV_RAID_MAP *pDrvRaidMap = &drv_map->raidMap;
 189
 190         if (instance->supportmax256vd) {
 191                 memcpy(fusion->ld_drv_map[instance->map_id & 1],
 192                         fusion->ld_map[instance->map_id & 1],
 193                         fusion->current_map_sz);
 194                 /* New Raid map will not set totalSize, so keep expected value
 195                  * for legacy code in ValidateMapInfo
 196                  */
 197                 pDrvRaidMap->totalSize =
 198                         cpu_to_le32(sizeof(struct MR_FW_RAID_MAP_EXT));
 199         } else {
 200                 fw_map_old = (struct MR_FW_RAID_MAP_ALL *)
 201                         fusion->ld_map[(instance->map_id & 1)];
 202                 pFwRaidMap = &fw_map_old->raidMap;
 203                 ld_count = (u16)le32_to_cpu(pFwRaidMap->ldCount);
 204
 205 #if VD_EXT_DEBUG
 206                 for (i = 0; i < ld_count; i++) {
 207                         dev_dbg(&instance->pdev->dev, "(%d) :Index 0x%x "
 208                                 "Target Id 0x%x Seq Num 0x%x Size 0/%llx\n",
 209                                 instance->unique_id, i,
 210                                 fw_map_old->raidMap.ldSpanMap[i].ldRaid.targetId,
 211                                 fw_map_old->raidMap.ldSpanMap[i].ldRaid.seqNum,
 212                                 fw_map_old->raidMap.ldSpanMap[i].ldRaid.size);
 213                 }
 214 #endif
 215
 216                 memset(drv_map, 0, fusion->drv_map_sz);
 217                 pDrvRaidMap->totalSize = pFwRaidMap->totalSize;
 218                 pDrvRaidMap->ldCount = (__le16)cpu_to_le16(ld_count);
 219                 pDrvRaidMap->fpPdIoTimeoutSec = pFwRaidMap->fpPdIoTimeoutSec;
 220                 for (i = 0; i < MAX_RAIDMAP_LOGICAL_DRIVES + MAX_RAIDMAP_VIEWS; i++)
 221                         pDrvRaidMap->ldTgtIdToLd[i] =
 222                                 (u8)pFwRaidMap->ldTgtIdToLd[i];
 223                 for (i = (MAX_RAIDMAP_LOGICAL_DRIVES + MAX_RAIDMAP_VIEWS);
 224                         i < MAX_LOGICAL_DRIVES_EXT; i++)
 225                         pDrvRaidMap->ldTgtIdToLd[i] = 0xff;
 226                 for (i = 0; i < ld_count; i++) {
 227                         pDrvRaidMap->ldSpanMap[i] = pFwRaidMap->ldSpanMap[i];
 228 #if VD_EXT_DEBUG
 229                         dev_dbg(&instance->pdev->dev,
 230                                 "pFwRaidMap->ldSpanMap[%d].ldRaid.targetId 0x%x "
 231                                 "pFwRaidMap->ldSpanMap[%d].ldRaid.seqNum 0x%x "
 232                                 "size 0x%x\n", i, i,
 233                                 pFwRaidMap->ldSpanMap[i].ldRaid.targetId,
 234                                 pFwRaidMap->ldSpanMap[i].ldRaid.seqNum,
 235                                 (u32)pFwRaidMap->ldSpanMap[i].ldRaid.rowSize);
 236                         dev_dbg(&instance->pdev->dev,
 237                                 "pDrvRaidMap->ldSpanMap[%d].ldRaid.targetId 0x%x "
 238                                 "pDrvRaidMap->ldSpanMap[%d].ldRaid.seqNum 0x%x "
 239                                 "size 0x%x\n", i, i,
 240                                 pDrvRaidMap->ldSpanMap[i].ldRaid.targetId,
 241                                 pDrvRaidMap->ldSpanMap[i].ldRaid.seqNum,
 242                                 (u32)pDrvRaidMap->ldSpanMap[i].ldRaid.rowSize);
 243                         dev_dbg(&instance->pdev->dev, "Driver raid map all %p "
 244                                 "raid map %p LD RAID MAP %p/%p\n", drv_map,
 245                                 pDrvRaidMap, &pFwRaidMap->ldSpanMap[i].ldRaid,
 246                                 &pDrvRaidMap->ldSpanMap[i].ldRaid);
 247 #endif
 248                 }
 249                 memcpy(pDrvRaidMap->arMapInfo, pFwRaidMap->arMapInfo,
 250                         sizeof(struct MR_ARRAY_INFO) * MAX_RAIDMAP_ARRAYS);
 251                 memcpy(pDrvRaidMap->devHndlInfo, pFwRaidMap->devHndlInfo,
 252                         sizeof(struct MR_DEV_HANDLE_INFO) *
 253                         MAX_RAIDMAP_PHYSICAL_DEVICES);
 254         }
 255 }
 256
 257 /*
 258  * This function will validate Map info data provided by FW
 259  */
 260 u8 MR_ValidateMapInfo(struct megasas_instance *instance)
 261 {
 262         struct fusion_context *fusion;
 263         struct MR_DRV_RAID_MAP_ALL *drv_map;
 264         struct MR_DRV_RAID_MAP *pDrvRaidMap;
 265         struct LD_LOAD_BALANCE_INFO *lbInfo;
 266         PLD_SPAN_INFO ldSpanInfo;
 267         struct MR_LD_RAID         *raid;
 268         u16 ldCount, num_lds;
 269         u16 ld;
 270         u32 expected_size;
 271
 272
 273         MR_PopulateDrvRaidMap(instance);
 274
 275         fusion = instance->ctrl_context;
 276         drv_map = fusion->ld_drv_map[(instance->map_id & 1)];
 277         pDrvRaidMap = &drv_map->raidMap;
 278
 279         lbInfo = fusion->load_balance_info;
 280         ldSpanInfo = fusion->log_to_span;
 281
 282         if (instance->supportmax256vd)
 283                 expected_size = sizeof(struct MR_FW_RAID_MAP_EXT);
 284         else
 285                 expected_size =
 286                         (sizeof(struct MR_FW_RAID_MAP) - sizeof(struct MR_LD_SPAN_MAP) +
 287                         (sizeof(struct MR_LD_SPAN_MAP) * le16_to_cpu(pDrvRaidMap->ldCount)));
 288
 289         if (le32_to_cpu(pDrvRaidMap->totalSize) != expected_size) {
 290                 dev_err(&instance->pdev->dev, "map info structure size 0x%x is not matching with ld count\n",
 291                        (unsigned int) expected_size);
 292                 dev_err(&instance->pdev->dev, "megasas: span map %x, pDrvRaidMap->totalSize : %x\n",
 293                         (unsigned int)sizeof(struct MR_LD_SPAN_MAP),
 294                         le32_to_cpu(pDrvRaidMap->totalSize));
 295                 return 0;
 296         }
 297
 298         if (instance->UnevenSpanSupport)
 299                 mr_update_span_set(drv_map, ldSpanInfo);
 300
 301         mr_update_load_balance_params(drv_map, lbInfo);
 302
 303         num_lds = le16_to_cpu(drv_map->raidMap.ldCount);
 304
 305         /*Convert Raid capability values to CPU arch */
 306         for (ldCount = 0; ldCount < num_lds; ldCount++) {
 307                 ld = MR_TargetIdToLdGet(ldCount, drv_map);
 308                 raid = MR_LdRaidGet(ld, drv_map);
 309                 le32_to_cpus((u32 *)&raid->capability);
 310         }
 311
 312         return 1;
 313 }
 314
 315 u32 MR_GetSpanBlock(u32 ld, u64 row, u64 *span_blk,
 316                     struct MR_DRV_RAID_MAP_ALL *map)
 317 {
 318         struct MR_SPAN_BLOCK_INFO *pSpanBlock = MR_LdSpanInfoGet(ld, map);
 319         struct MR_QUAD_ELEMENT    *quad;
 320         struct MR_LD_RAID         *raid = MR_LdRaidGet(ld, map);
 321         u32                span, j;
 322
 323         for (span = 0; span < raid->spanDepth; span++, pSpanBlock++) {
 324
 325                 for (j = 0; j < le32_to_cpu(pSpanBlock->block_span_info.noElements); j++) {
 326                         quad = &pSpanBlock->block_span_info.quad[j];
 327
 328                         if (le32_to_cpu(quad->diff) == 0)
 329                                 return SPAN_INVALID;
 330                         if (le64_to_cpu(quad->logStart) <= row && row <=
 331                                 le64_to_cpu(quad->logEnd) && (mega_mod64(row - le64_to_cpu(quad->logStart),
 332                                 le32_to_cpu(quad->diff))) == 0) {
 333                                 if (span_blk != NULL) {
 334                                         u64  blk, debugBlk;
 335                                         blk =  mega_div64_32((row-le64_to_cpu(quad->logStart)), le32_to_cpu(quad->diff));
 336                                         debugBlk = blk;
 337
 338                                         blk = (blk + le64_to_cpu(quad->offsetInSpan)) << raid->stripeShift;
 339                                         *span_blk = blk;
 340                                 }
 341                                 return span;
 342                         }
 343                 }
 344         }
 345         return SPAN_INVALID;
 346 }
 347
 348 /*
 349 ******************************************************************************
 350 *
 351 * Function to print info about span set created in driver from FW raid map
 352 *
 353 * Inputs :
 354 * map    - LD map
 355 * ldSpanInfo - ldSpanInfo per HBA instance
 356 */
 357 #if SPAN_DEBUG
 358 static int getSpanInfo(struct MR_DRV_RAID_MAP_ALL *map,
 359         PLD_SPAN_INFO ldSpanInfo)
 360 {
 361
 362         u8   span;
 363         u32    element;
 364         struct MR_LD_RAID *raid;
 365         LD_SPAN_SET *span_set;
 366         struct MR_QUAD_ELEMENT    *quad;
 367         int ldCount;
 368         u16 ld;
 369
 370         for (ldCount = 0; ldCount < MAX_LOGICAL_DRIVES_EXT; ldCount++) {
 371                 ld = MR_TargetIdToLdGet(ldCount, map);
 372                         if (ld >= (MAX_LOGICAL_DRIVES_EXT - 1))
 373                                 continue;
 374                 raid = MR_LdRaidGet(ld, map);
 375                 dev_dbg(&instance->pdev->dev, "LD %x: span_depth=%x\n",
 376                         ld, raid->spanDepth);
 377                 for (span = 0; span < raid->spanDepth; span++)
 378                         dev_dbg(&instance->pdev->dev, "Span=%x,"
 379                         " number of quads=%x\n", span,
 380                         le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
 381                         block_span_info.noElements));
 382                 for (element = 0; element < MAX_QUAD_DEPTH; element++) {
 383                         span_set = &(ldSpanInfo[ld].span_set[element]);
 384                         if (span_set->span_row_data_width == 0)
 385                                 break;
 386
 387                         dev_dbg(&instance->pdev->dev, "Span Set %x:"
 388                                 "width=%x, diff=%x\n", element,
 389                                 (unsigned int)span_set->span_row_data_width,
 390                                 (unsigned int)span_set->diff);
 391                         dev_dbg(&instance->pdev->dev, "logical LBA"
 392                                 "start=0x%08lx, end=0x%08lx\n",
 393                                 (long unsigned int)span_set->log_start_lba,
 394                                 (long unsigned int)span_set->log_end_lba);
 395                         dev_dbg(&instance->pdev->dev, "span row start=0x%08lx,"
 396                                 " end=0x%08lx\n",
 397                                 (long unsigned int)span_set->span_row_start,
 398                                 (long unsigned int)span_set->span_row_end);
 399                         dev_dbg(&instance->pdev->dev, "data row start=0x%08lx,"
 400                                 " end=0x%08lx\n",
 401                                 (long unsigned int)span_set->data_row_start,
 402                                 (long unsigned int)span_set->data_row_end);
 403                         dev_dbg(&instance->pdev->dev, "data strip start=0x%08lx,"
 404                                 " end=0x%08lx\n",
 405                                 (long unsigned int)span_set->data_strip_start,
 406                                 (long unsigned int)span_set->data_strip_end);
 407
 408                         for (span = 0; span < raid->spanDepth; span++) {
 409                                 if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
 410                                         block_span_info.noElements) >=
 411                                         element + 1) {
 412                                         quad = &map->raidMap.ldSpanMap[ld].
 413                                                 spanBlock[span].block_span_info.
 414                                                 quad[element];
 415                                 dev_dbg(&instance->pdev->dev, "Span=%x,"
 416                                         "Quad=%x, diff=%x\n", span,
 417                                         element, le32_to_cpu(quad->diff));
 418                                 dev_dbg(&instance->pdev->dev,
 419                                         "offset_in_span=0x%08lx\n",
 420                                         (long unsigned int)le64_to_cpu(quad->offsetInSpan));
 421                                 dev_dbg(&instance->pdev->dev,
 422                                         "logical start=0x%08lx, end=0x%08lx\n",
 423                                         (long unsigned int)le64_to_cpu(quad->logStart),
 424                                         (long unsigned int)le64_to_cpu(quad->logEnd));
 425                                 }
 426                         }
 427                 }
 428         }
 429         return 0;
 430 }
 431 #endif
 432
 433 /*
 434 ******************************************************************************
 435 *
 436 * This routine calculates the Span block for given row using spanset.
 437 *
 438 * Inputs :
 439 *    instance - HBA instance
 440 *    ld   - Logical drive number
 441 *    row        - Row number
 442 *    map    - LD map
 443 *
 444 * Outputs :
 445 *
 446 *    span          - Span number
 447 *    block         - Absolute Block number in the physical disk
 448 *    div_error     - Devide error code.
 449 */
 450
 451 u32 mr_spanset_get_span_block(struct megasas_instance *instance,
 452                 u32 ld, u64 row, u64 *span_blk, struct MR_DRV_RAID_MAP_ALL *map)
 453 {
 454         struct fusion_context *fusion = instance->ctrl_context;
 455         struct MR_LD_RAID         *raid = MR_LdRaidGet(ld, map);
 456         LD_SPAN_SET *span_set;
 457         struct MR_QUAD_ELEMENT    *quad;
 458         u32    span, info;
 459         PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span;
 460
 461         for (info = 0; info < MAX_QUAD_DEPTH; info++) {
 462                 span_set = &(ldSpanInfo[ld].span_set[info]);
 463
 464                 if (span_set->span_row_data_width == 0)
 465                         break;
 466
 467                 if (row > span_set->data_row_end)
 468                         continue;
 469
 470                 for (span = 0; span < raid->spanDepth; span++)
 471                         if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
 472                                 block_span_info.noElements) >= info+1) {
 473                                 quad = &map->raidMap.ldSpanMap[ld].
 474                                         spanBlock[span].
 475                                         block_span_info.quad[info];
 476                                 if (le32_to_cpu(quad->diff) == 0)
 477                                         return SPAN_INVALID;
 478                                 if (le64_to_cpu(quad->logStart) <= row  &&
 479                                         row <= le64_to_cpu(quad->logEnd)  &&
 480                                         (mega_mod64(row - le64_to_cpu(quad->logStart),
 481                                                 le32_to_cpu(quad->diff))) == 0) {
 482                                         if (span_blk != NULL) {
 483                                                 u64  blk;
 484                                                 blk = mega_div64_32
 485                                                     ((row - le64_to_cpu(quad->logStart)),
 486                                                     le32_to_cpu(quad->diff));
 487                                                 blk = (blk + le64_to_cpu(quad->offsetInSpan))
 488                                                          << raid->stripeShift;
 489                                                 *span_blk = blk;
 490                                         }
 491                                         return span;
 492                                 }
 493                         }
 494         }
 495         return SPAN_INVALID;
 496 }
 497
 498 /*
 499 ******************************************************************************
 500 *
 501 * This routine calculates the row for given strip using spanset.
 502 *
 503 * Inputs :
 504 *    instance - HBA instance
 505 *    ld   - Logical drive number
 506 *    Strip        - Strip
 507 *    map    - LD map
 508 *
 509 * Outputs :
 510 *
 511 *    row         - row associated with strip
 512 */
 513
 514 static u64  get_row_from_strip(struct megasas_instance *instance,
 515         u32 ld, u64 strip, struct MR_DRV_RAID_MAP_ALL *map)
 516 {
 517         struct fusion_context *fusion = instance->ctrl_context;
 518         struct MR_LD_RAID       *raid = MR_LdRaidGet(ld, map);
 519         LD_SPAN_SET     *span_set;
 520         PLD_SPAN_INFO   ldSpanInfo = fusion->log_to_span;
 521         u32             info, strip_offset, span, span_offset;
 522         u64             span_set_Strip, span_set_Row, retval;
 523
 524         for (info = 0; info < MAX_QUAD_DEPTH; info++) {
 525                 span_set = &(ldSpanInfo[ld].span_set[info]);
 526
 527                 if (span_set->span_row_data_width == 0)
 528                         break;
 529                 if (strip > span_set->data_strip_end)
 530                         continue;
 531
 532                 span_set_Strip = strip - span_set->data_strip_start;
 533                 strip_offset = mega_mod64(span_set_Strip,
 534                                 span_set->span_row_data_width);
 535                 span_set_Row = mega_div64_32(span_set_Strip,
 536                                 span_set->span_row_data_width) * span_set->diff;
 537                 for (span = 0, span_offset = 0; span < raid->spanDepth; span++)
 538                         if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
 539                                 block_span_info.noElements) >= info+1) {
 540                                 if (strip_offset >=
 541                                         span_set->strip_offset[span])
 542                                         span_offset++;
 543                                 else
 544                                         break;
 545                         }
 546 #if SPAN_DEBUG
 547                 dev_info(&instance->pdev->dev, "Strip 0x%llx,"
 548                         "span_set_Strip 0x%llx, span_set_Row 0x%llx"
 549                         "data width 0x%llx span offset 0x%x\n", strip,
 550                         (unsigned long long)span_set_Strip,
 551                         (unsigned long long)span_set_Row,
 552                         (unsigned long long)span_set->span_row_data_width,
 553                         span_offset);
 554                 dev_info(&instance->pdev->dev, "For strip 0x%llx"
 555                         "row is 0x%llx\n", strip,
 556                         (unsigned long long) span_set->data_row_start +
 557                         (unsigned long long) span_set_Row + (span_offset - 1));
 558 #endif
 559                 retval = (span_set->data_row_start + span_set_Row +
 560                                 (span_offset - 1));
 561                 return retval;
 562         }
 563         return -1LLU;
 564 }
 565
 566
 567 /*
 568 ******************************************************************************
 569 *
 570 * This routine calculates the Start Strip for given row using spanset.
 571 *
 572 * Inputs :
 573 *    instance - HBA instance
 574 *    ld   - Logical drive number
 575 *    row        - Row number
 576 *    map    - LD map
 577 *
 578 * Outputs :
 579 *
 580 *    Strip         - Start strip associated with row
 581 */
 582
 583 static u64 get_strip_from_row(struct megasas_instance *instance,
 584                 u32 ld, u64 row, struct MR_DRV_RAID_MAP_ALL *map)
 585 {
 586         struct fusion_context *fusion = instance->ctrl_context;
 587         struct MR_LD_RAID         *raid = MR_LdRaidGet(ld, map);
 588         LD_SPAN_SET *span_set;
 589         struct MR_QUAD_ELEMENT    *quad;
 590         PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span;
 591         u32    span, info;
 592         u64  strip;
 593
 594         for (info = 0; info < MAX_QUAD_DEPTH; info++) {
 595                 span_set = &(ldSpanInfo[ld].span_set[info]);
 596
 597                 if (span_set->span_row_data_width == 0)
 598                         break;
 599                 if (row > span_set->data_row_end)
 600                         continue;
 601
 602                 for (span = 0; span < raid->spanDepth; span++)
 603                         if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
 604                                 block_span_info.noElements) >= info+1) {
 605                                 quad = &map->raidMap.ldSpanMap[ld].
 606                                         spanBlock[span].block_span_info.quad[info];
 607                                 if (le64_to_cpu(quad->logStart) <= row  &&
 608                                         row <= le64_to_cpu(quad->logEnd)  &&
 609                                         mega_mod64((row - le64_to_cpu(quad->logStart)),
 610                                         le32_to_cpu(quad->diff)) == 0) {
 611                                         strip = mega_div64_32
 612                                                 (((row - span_set->data_row_start)
 613                                                         - le64_to_cpu(quad->logStart)),
 614                                                         le32_to_cpu(quad->diff));
 615                                         strip *= span_set->span_row_data_width;
 616                                         strip += span_set->data_strip_start;
 617                                         strip += span_set->strip_offset[span];
 618                                         return strip;
 619                                 }
 620                         }
 621         }
 622         dev_err(&instance->pdev->dev, "get_strip_from_row"
 623                 "returns invalid strip for ld=%x, row=%lx\n",
 624                 ld, (long unsigned int)row);
 625         return -1;
 626 }
 627
 628 /*
 629 ******************************************************************************
 630 *
 631 * This routine calculates the Physical Arm for given strip using spanset.
 632 *
 633 * Inputs :
 634 *    instance - HBA instance
 635 *    ld   - Logical drive number
 636 *    strip      - Strip
 637 *    map    - LD map
 638 *
 639 * Outputs :
 640 *
 641 *    Phys Arm         - Phys Arm associated with strip
 642 */
 643
 644 static u32 get_arm_from_strip(struct megasas_instance *instance,
 645         u32 ld, u64 strip, struct MR_DRV_RAID_MAP_ALL *map)
 646 {
 647         struct fusion_context *fusion = instance->ctrl_context;
 648         struct MR_LD_RAID         *raid = MR_LdRaidGet(ld, map);
 649         LD_SPAN_SET *span_set;
 650         PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span;
 651         u32    info, strip_offset, span, span_offset, retval;
 652
 653         for (info = 0 ; info < MAX_QUAD_DEPTH; info++) {
 654                 span_set = &(ldSpanInfo[ld].span_set[info]);
 655
 656                 if (span_set->span_row_data_width == 0)
 657                         break;
 658                 if (strip > span_set->data_strip_end)
 659                         continue;
 660
 661                 strip_offset = (uint)mega_mod64
 662                                 ((strip - span_set->data_strip_start),
 663                                 span_set->span_row_data_width);
 664
 665                 for (span = 0, span_offset = 0; span < raid->spanDepth; span++)
 666                         if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
 667                                 block_span_info.noElements) >= info+1) {
 668                                 if (strip_offset >=
 669                                         span_set->strip_offset[span])
 670                                         span_offset =
 671                                                 span_set->strip_offset[span];
 672                                 else
 673                                         break;
 674                         }
 675 #if SPAN_DEBUG
 676                 dev_info(&instance->pdev->dev, "get_arm_from_strip:"
 677                         "for ld=0x%x strip=0x%lx arm is  0x%x\n", ld,
 678                         (long unsigned int)strip, (strip_offset - span_offset));
 679 #endif
 680                 retval = (strip_offset - span_offset);
 681                 return retval;
 682         }
 683
 684         dev_err(&instance->pdev->dev, "get_arm_from_strip"
 685                 "returns invalid arm for ld=%x strip=%lx\n",
 686                 ld, (long unsigned int)strip);
 687
 688         return -1;
 689 }
 690
 691 /* This Function will return Phys arm */
 692 u8 get_arm(struct megasas_instance *instance, u32 ld, u8 span, u64 stripe,
 693                 struct MR_DRV_RAID_MAP_ALL *map)
 694 {
 695         struct MR_LD_RAID  *raid = MR_LdRaidGet(ld, map);
 696         /* Need to check correct default value */
 697         u32    arm = 0;
 698
 699         switch (raid->level) {
 700         case 0:
 701         case 5:
 702         case 6:
 703                 arm = mega_mod64(stripe, SPAN_ROW_SIZE(map, ld, span));
 704                 break;
 705         case 1:
 706                 /* start with logical arm */
 707                 arm = get_arm_from_strip(instance, ld, stripe, map);
 708                 if (arm != -1U)
 709                         arm *= 2;
 710                 break;
 711         }
 712
 713         return arm;
 714 }
 715
 716
 717 /*
 718 ******************************************************************************
 719 *
 720 * This routine calculates the arm, span and block for the specified stripe and
 721 * reference in stripe using spanset
 722 *
 723 * Inputs :
 724 *
 725 *    ld   - Logical drive number
 726 *    stripRow        - Stripe number
 727 *    stripRef    - Reference in stripe
 728 *
 729 * Outputs :
 730 *
 731 *    span          - Span number
 732 *    block         - Absolute Block number in the physical disk
 733 */
 734 static u8 mr_spanset_get_phy_params(struct megasas_instance *instance, u32 ld,
 735                 u64 stripRow, u16 stripRef, struct IO_REQUEST_INFO *io_info,
 736                 struct RAID_CONTEXT *pRAID_Context,
 737                 struct MR_DRV_RAID_MAP_ALL *map)
 738 {
 739         struct MR_LD_RAID  *raid = MR_LdRaidGet(ld, map);
 740         u32     pd, arRef;
 741         u8      physArm, span;
 742         u64     row;
 743         u8      retval = TRUE;
 744         u64     *pdBlock = &io_info->pdBlock;
 745         __le16  *pDevHandle = &io_info->devHandle;
 746         u32     logArm, rowMod, armQ, arm;
 747         struct fusion_context *fusion;
 748
 749         fusion = instance->ctrl_context;
 750
 751         /*Get row and span from io_info for Uneven Span IO.*/
 752         row         = io_info->start_row;
 753         span        = io_info->start_span;
 754
 755
 756         if (raid->level == 6) {
 757                 logArm = get_arm_from_strip(instance, ld, stripRow, map);
 758                 if (logArm == -1U)
 759                         return FALSE;
 760                 rowMod = mega_mod64(row, SPAN_ROW_SIZE(map, ld, span));
 761                 armQ = SPAN_ROW_SIZE(map, ld, span) - 1 - rowMod;
 762                 arm = armQ + 1 + logArm;
 763                 if (arm >= SPAN_ROW_SIZE(map, ld, span))
 764                         arm -= SPAN_ROW_SIZE(map, ld, span);
 765                 physArm = (u8)arm;
 766         } else
 767                 /* Calculate the arm */
 768                 physArm = get_arm(instance, ld, span, stripRow, map);
 769         if (physArm == 0xFF)
 770                 return FALSE;
 771
 772         arRef       = MR_LdSpanArrayGet(ld, span, map);
 773         pd          = MR_ArPdGet(arRef, physArm, map);
 774
 775         if (pd != MR_PD_INVALID)
 776                 *pDevHandle = MR_PdDevHandleGet(pd, map);
 777         else {
 778                 *pDevHandle = cpu_to_le16(MR_PD_INVALID);
 779                 if ((raid->level >= 5) &&
 780                         ((fusion->adapter_type == THUNDERBOLT_SERIES)  ||
 781                         ((fusion->adapter_type == INVADER_SERIES) &&
 782                         (raid->regTypeReqOnRead != REGION_TYPE_UNUSED))))
 783                         pRAID_Context->regLockFlags = REGION_TYPE_EXCLUSIVE;
 784                 else if (raid->level == 1) {
 785                         pd = MR_ArPdGet(arRef, physArm + 1, map);
 786                         if (pd != MR_PD_INVALID)
 787                                 *pDevHandle = MR_PdDevHandleGet(pd, map);
 788                 }
 789         }
 790
 791         *pdBlock += stripRef + le64_to_cpu(MR_LdSpanPtrGet(ld, span, map)->startBlk);
 792         pRAID_Context->spanArm = (span << RAID_CTX_SPANARM_SPAN_SHIFT) |
 793                                         physArm;
 794         io_info->span_arm = pRAID_Context->spanArm;
 795         return retval;
 796 }
 797
 798 /*
 799 ******************************************************************************
 800 *
 801 * This routine calculates the arm, span and block for the specified stripe and
 802 * reference in stripe.
 803 *
 804 * Inputs :
 805 *
 806 *    ld   - Logical drive number
 807 *    stripRow        - Stripe number
 808 *    stripRef    - Reference in stripe
 809 *
 810 * Outputs :
 811 *
 812 *    span          - Span number
 813 *    block         - Absolute Block number in the physical disk
 814 */
 815 u8 MR_GetPhyParams(struct megasas_instance *instance, u32 ld, u64 stripRow,
 816                 u16 stripRef, struct IO_REQUEST_INFO *io_info,
 817                 struct RAID_CONTEXT *pRAID_Context,
 818                 struct MR_DRV_RAID_MAP_ALL *map)
 819 {
 820         struct MR_LD_RAID  *raid = MR_LdRaidGet(ld, map);
 821         u32         pd, arRef;
 822         u8          physArm, span;
 823         u64         row;
 824         u8          retval = TRUE;
 825         u64         *pdBlock = &io_info->pdBlock;
 826         __le16      *pDevHandle = &io_info->devHandle;
 827         struct fusion_context *fusion;
 828
 829         fusion = instance->ctrl_context;
 830
 831
 832         row =  mega_div64_32(stripRow, raid->rowDataSize);
 833
 834         if (raid->level == 6) {
 835                 /* logical arm within row */
 836                 u32 logArm =  mega_mod64(stripRow, raid->rowDataSize);
 837                 u32 rowMod, armQ, arm;
 838
 839                 if (raid->rowSize == 0)
 840                         return FALSE;
 841                 /* get logical row mod */
 842                 rowMod = mega_mod64(row, raid->rowSize);
 843                 armQ = raid->rowSize-1-rowMod; /* index of Q drive */
 844                 arm = armQ+1+logArm; /* data always logically follows Q */
 845                 if (arm >= raid->rowSize) /* handle wrap condition */
 846                         arm -= raid->rowSize;
 847                 physArm = (u8)arm;
 848         } else  {
 849                 if (raid->modFactor == 0)
 850                         return FALSE;
 851                 physArm = MR_LdDataArmGet(ld,  mega_mod64(stripRow,
 852                                                           raid->modFactor),
 853                                           map);
 854         }
 855
 856         if (raid->spanDepth == 1) {
 857                 span = 0;
 858                 *pdBlock = row << raid->stripeShift;
 859         } else {
 860                 span = (u8)MR_GetSpanBlock(ld, row, pdBlock, map);
 861                 if (span == SPAN_INVALID)
 862                         return FALSE;
 863         }
 864
 865         /* Get the array on which this span is present */
 866         arRef       = MR_LdSpanArrayGet(ld, span, map);
 867         pd          = MR_ArPdGet(arRef, physArm, map); /* Get the pd */
 868
 869         if (pd != MR_PD_INVALID)
 870                 /* Get dev handle from Pd. */
 871                 *pDevHandle = MR_PdDevHandleGet(pd, map);
 872         else {
 873                 /* set dev handle as invalid. */
 874                 *pDevHandle = cpu_to_le16(MR_PD_INVALID);
 875                 if ((raid->level >= 5) &&
 876                         ((fusion->adapter_type == THUNDERBOLT_SERIES)  ||
 877                         ((fusion->adapter_type == INVADER_SERIES) &&
 878                         (raid->regTypeReqOnRead != REGION_TYPE_UNUSED))))
 879                         pRAID_Context->regLockFlags = REGION_TYPE_EXCLUSIVE;
 880                 else if (raid->level == 1) {
 881                         /* Get alternate Pd. */
 882                         pd = MR_ArPdGet(arRef, physArm + 1, map);
 883                         if (pd != MR_PD_INVALID)
 884                                 /* Get dev handle from Pd */
 885                                 *pDevHandle = MR_PdDevHandleGet(pd, map);
 886                 }
 887         }
 888
 889         *pdBlock += stripRef + le64_to_cpu(MR_LdSpanPtrGet(ld, span, map)->startBlk);
 890         pRAID_Context->spanArm = (span << RAID_CTX_SPANARM_SPAN_SHIFT) |
 891                 physArm;
 892         io_info->span_arm = pRAID_Context->spanArm;
 893         return retval;
 894 }
 895
 896 /*
 897 ******************************************************************************
 898 *
 899 * MR_BuildRaidContext function
 900 *
 901 * This function will initiate command processing.  The start/end row and strip
 902 * information is calculated then the lock is acquired.
 903 * This function will return 0 if region lock was acquired OR return num strips
 904 */
 905 u8
 906 MR_BuildRaidContext(struct megasas_instance *instance,
 907                     struct IO_REQUEST_INFO *io_info,
 908                     struct RAID_CONTEXT *pRAID_Context,
 909                     struct MR_DRV_RAID_MAP_ALL *map, u8 **raidLUN)
 910 {
 911         struct fusion_context *fusion;
 912         struct MR_LD_RAID  *raid;
 913         u32         ld, stripSize, stripe_mask;
 914         u64         endLba, endStrip, endRow, start_row, start_strip;
 915         u64         regStart;
 916         u32         regSize;
 917         u8          num_strips, numRows;
 918         u16         ref_in_start_stripe, ref_in_end_stripe;
 919         u64         ldStartBlock;
 920         u32         numBlocks, ldTgtId;
 921         u8          isRead;
 922         u8          retval = 0;
 923         u8          startlba_span = SPAN_INVALID;
 924         u64 *pdBlock = &io_info->pdBlock;
 925
 926         ldStartBlock = io_info->ldStartBlock;
 927         numBlocks = io_info->numBlocks;
 928         ldTgtId = io_info->ldTgtId;
 929         isRead = io_info->isRead;
 930         io_info->IoforUnevenSpan = 0;
 931         io_info->start_span     = SPAN_INVALID;
 932         fusion = instance->ctrl_context;
 933
 934         ld = MR_TargetIdToLdGet(ldTgtId, map);
 935         raid = MR_LdRaidGet(ld, map);
 936
 937         /*
 938          * if rowDataSize @RAID map and spanRowDataSize @SPAN INFO are zero
 939          * return FALSE
 940          */
 941         if (raid->rowDataSize == 0) {
 942                 if (MR_LdSpanPtrGet(ld, 0, map)->spanRowDataSize == 0)
 943                         return FALSE;
 944                 else if (instance->UnevenSpanSupport) {
 945                         io_info->IoforUnevenSpan = 1;
 946                 } else {
 947                         dev_info(&instance->pdev->dev,
 948                                 "raid->rowDataSize is 0, but has SPAN[0]"
 949                                 "rowDataSize = 0x%0x,"
 950                                 "but there is _NO_ UnevenSpanSupport\n",
 951                                 MR_LdSpanPtrGet(ld, 0, map)->spanRowDataSize);
 952                         return FALSE;
 953                 }
 954         }
 955
 956         stripSize = 1 << raid->stripeShift;
 957         stripe_mask = stripSize-1;
 958
 959
 960         /*
 961          * calculate starting row and stripe, and number of strips and rows
 962          */
 963         start_strip         = ldStartBlock >> raid->stripeShift;
 964         ref_in_start_stripe = (u16)(ldStartBlock & stripe_mask);
 965         endLba              = ldStartBlock + numBlocks - 1;
 966         ref_in_end_stripe   = (u16)(endLba & stripe_mask);
 967         endStrip            = endLba >> raid->stripeShift;
 968         num_strips          = (u8)(endStrip - start_strip + 1); /* End strip */
 969
 970         if (io_info->IoforUnevenSpan) {
 971                 start_row = get_row_from_strip(instance, ld, start_strip, map);
 972                 endRow    = get_row_from_strip(instance, ld, endStrip, map);
 973                 if (start_row == -1ULL || endRow == -1ULL) {
 974                         dev_info(&instance->pdev->dev, "return from %s %d."
 975                                 "Send IO w/o region lock.\n",
 976                                 __func__, __LINE__);
 977                         return FALSE;
 978                 }
 979
 980                 if (raid->spanDepth == 1) {
 981                         startlba_span = 0;
 982                         *pdBlock = start_row << raid->stripeShift;
 983                 } else
 984                         startlba_span = (u8)mr_spanset_get_span_block(instance,
 985                                                 ld, start_row, pdBlock, map);
 986                 if (startlba_span == SPAN_INVALID) {
 987                         dev_info(&instance->pdev->dev, "return from %s %d"
 988                                 "for row 0x%llx,start strip %llx"
 989                                 "endSrip %llx\n", __func__, __LINE__,
 990                                 (unsigned long long)start_row,
 991                                 (unsigned long long)start_strip,
 992                                 (unsigned long long)endStrip);
 993                         return FALSE;
 994                 }
 995                 io_info->start_span     = startlba_span;
 996                 io_info->start_row      = start_row;
 997 #if SPAN_DEBUG
 998                 dev_dbg(&instance->pdev->dev, "Check Span number from %s %d"
 999                         "for row 0x%llx, start strip 0x%llx end strip 0x%llx"
1000                         " span 0x%x\n", __func__, __LINE__,
1001                         (unsigned long long)start_row,
1002                         (unsigned long long)start_strip,
1003                         (unsigned long long)endStrip, startlba_span);
1004                 dev_dbg(&instance->pdev->dev, "start_row 0x%llx endRow 0x%llx"
1005                         "Start span 0x%x\n", (unsigned long long)start_row,
1006                         (unsigned long long)endRow, startlba_span);
1007 #endif
1008         } else {
1009                 start_row = mega_div64_32(start_strip, raid->rowDataSize);
1010                 endRow    = mega_div64_32(endStrip, raid->rowDataSize);
1011         }
1012         numRows = (u8)(endRow - start_row + 1);
1013
1014         /*
1015          * calculate region info.
1016          */
1017
1018         /* assume region is at the start of the first row */
1019         regStart            = start_row << raid->stripeShift;
1020         /* assume this IO needs the full row - we'll adjust if not true */
1021         regSize             = stripSize;
1022
1023         /* Check if we can send this I/O via FastPath */
1024         if (raid->capability.fpCapable) {
1025                 if (isRead)
1026                         io_info->fpOkForIo = (raid->capability.fpReadCapable &&
1027                                               ((num_strips == 1) ||
1028                                                raid->capability.
1029                                                fpReadAcrossStripe));
1030                 else
1031                         io_info->fpOkForIo = (raid->capability.fpWriteCapable &&
1032                                               ((num_strips == 1) ||
1033                                                raid->capability.
1034                                                fpWriteAcrossStripe));
1035         } else
1036                 io_info->fpOkForIo = FALSE;
1037
1038         if (numRows == 1) {
1039                 /* single-strip IOs can always lock only the data needed */
1040                 if (num_strips == 1) {
1041                         regStart += ref_in_start_stripe;
1042                         regSize = numBlocks;
1043                 }
1044                 /* multi-strip IOs always need to full stripe locked */
1045         } else if (io_info->IoforUnevenSpan == 0) {
1046                 /*
1047                  * For Even span region lock optimization.
1048                  * If the start strip is the last in the start row
1049                  */
1050                 if (start_strip == (start_row + 1) * raid->rowDataSize - 1) {
1051                         regStart += ref_in_start_stripe;
1052                         /* initialize count to sectors from startref to end
1053                            of strip */
1054                         regSize = stripSize - ref_in_start_stripe;
1055                 }
1056
1057                 /* add complete rows in the middle of the transfer */
1058                 if (numRows > 2)
1059                         regSize += (numRows-2) << raid->stripeShift;
1060
1061                 /* if IO ends within first strip of last row*/
1062                 if (endStrip == endRow*raid->rowDataSize)
1063                         regSize += ref_in_end_stripe+1;
1064                 else
1065                         regSize += stripSize;
1066         } else {
1067                 /*
1068                  * For Uneven span region lock optimization.
1069                  * If the start strip is the last in the start row
1070                  */
1071                 if (start_strip == (get_strip_from_row(instance, ld, start_row, map) +
1072                                 SPAN_ROW_DATA_SIZE(map, ld, startlba_span) - 1)) {
1073                         regStart += ref_in_start_stripe;
1074                         /* initialize count to sectors from
1075                          * startRef to end of strip
1076                          */
1077                         regSize = stripSize - ref_in_start_stripe;
1078                 }
1079                 /* Add complete rows in the middle of the transfer*/
1080
1081                 if (numRows > 2)
1082                         /* Add complete rows in the middle of the transfer*/
1083                         regSize += (numRows-2) << raid->stripeShift;
1084
1085                 /* if IO ends within first strip of last row */
1086                 if (endStrip == get_strip_from_row(instance, ld, endRow, map))
1087                         regSize += ref_in_end_stripe + 1;
1088                 else
1089                         regSize += stripSize;
1090         }
1091
1092         pRAID_Context->timeoutValue =
1093                 cpu_to_le16(raid->fpIoTimeoutForLd ?
1094                             raid->fpIoTimeoutForLd :
1095                             map->raidMap.fpPdIoTimeoutSec);
1096         if (fusion->adapter_type == INVADER_SERIES)
1097                 pRAID_Context->regLockFlags = (isRead) ?
1098                         raid->regTypeReqOnRead : raid->regTypeReqOnWrite;
1099         else
1100                 pRAID_Context->regLockFlags = (isRead) ?
1101                         REGION_TYPE_SHARED_READ : raid->regTypeReqOnWrite;
1102         pRAID_Context->VirtualDiskTgtId = raid->targetId;
1103         pRAID_Context->regLockRowLBA    = cpu_to_le64(regStart);
1104         pRAID_Context->regLockLength    = cpu_to_le32(regSize);
1105         pRAID_Context->configSeqNum     = raid->seqNum;
1106         /* save pointer to raid->LUN array */
1107         *raidLUN = raid->LUN;
1108
1109
1110         /*Get Phy Params only if FP capable, or else leave it to MR firmware
1111           to do the calculation.*/
1112         if (io_info->fpOkForIo) {
1113                 retval = io_info->IoforUnevenSpan ?
1114                                 mr_spanset_get_phy_params(instance, ld,
1115                                         start_strip, ref_in_start_stripe,
1116                                         io_info, pRAID_Context, map) :
1117                                 MR_GetPhyParams(instance, ld, start_strip,
1118                                         ref_in_start_stripe, io_info,
1119                                         pRAID_Context, map);
1120                 /* If IO on an invalid Pd, then FP is not possible.*/
1121                 if (io_info->devHandle == cpu_to_le16(MR_PD_INVALID))
1122                         io_info->fpOkForIo = FALSE;
1123                 return retval;
1124         } else if (isRead) {
1125                 uint stripIdx;
1126                 for (stripIdx = 0; stripIdx < num_strips; stripIdx++) {
1127                         retval = io_info->IoforUnevenSpan ?
1128                                 mr_spanset_get_phy_params(instance, ld,
1129                                     start_strip + stripIdx,
1130                                     ref_in_start_stripe, io_info,
1131                                     pRAID_Context, map) :
1132                                 MR_GetPhyParams(instance, ld,
1133                                     start_strip + stripIdx, ref_in_start_stripe,
1134                                     io_info, pRAID_Context, map);
1135                         if (!retval)
1136                                 return TRUE;
1137                 }
1138         }
1139
1140 #if SPAN_DEBUG
1141         /* Just for testing what arm we get for strip.*/
1142         if (io_info->IoforUnevenSpan)
1143                 get_arm_from_strip(instance, ld, start_strip, map);
1144 #endif
1145         return TRUE;
1146 }
1147
1148 /*
1149 ******************************************************************************
1150 *
1151 * This routine pepare spanset info from Valid Raid map and store it into
1152 * local copy of ldSpanInfo per instance data structure.
1153 *
1154 * Inputs :
1155 * map    - LD map
1156 * ldSpanInfo - ldSpanInfo per HBA instance
1157 *
1158 */
1159 void mr_update_span_set(struct MR_DRV_RAID_MAP_ALL *map,
1160         PLD_SPAN_INFO ldSpanInfo)
1161 {
1162         u8   span, count;
1163         u32  element, span_row_width;
1164         u64  span_row;
1165         struct MR_LD_RAID *raid;
1166         LD_SPAN_SET *span_set, *span_set_prev;
1167         struct MR_QUAD_ELEMENT    *quad;
1168         int ldCount;
1169         u16 ld;
1170
1171
1172         for (ldCount = 0; ldCount < MAX_LOGICAL_DRIVES_EXT; ldCount++) {
1173                 ld = MR_TargetIdToLdGet(ldCount, map);
1174                 if (ld >= (MAX_LOGICAL_DRIVES_EXT - 1))
1175                         continue;
1176                 raid = MR_LdRaidGet(ld, map);
1177                 for (element = 0; element < MAX_QUAD_DEPTH; element++) {
1178                         for (span = 0; span < raid->spanDepth; span++) {
1179                                 if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
1180                                         block_span_info.noElements) <
1181                                         element + 1)
1182                                         continue;
1183                                 span_set = &(ldSpanInfo[ld].span_set[element]);
1184                                 quad = &map->raidMap.ldSpanMap[ld].
1185                                         spanBlock[span].block_span_info.
1186                                         quad[element];
1187
1188                                 span_set->diff = le32_to_cpu(quad->diff);
1189
1190                                 for (count = 0, span_row_width = 0;
1191                                         count < raid->spanDepth; count++) {
1192                                         if (le32_to_cpu(map->raidMap.ldSpanMap[ld].
1193                                                 spanBlock[count].
1194                                                 block_span_info.
1195                                                 noElements) >= element + 1) {
1196                                                 span_set->strip_offset[count] =
1197                                                         span_row_width;
1198                                                 span_row_width +=
1199                                                         MR_LdSpanPtrGet
1200                                                         (ld, count, map)->spanRowDataSize;
1201                                         }
1202                                 }
1203
1204                                 span_set->span_row_data_width = span_row_width;
1205                                 span_row = mega_div64_32(((le64_to_cpu(quad->logEnd) -
1206                                         le64_to_cpu(quad->logStart)) + le32_to_cpu(quad->diff)),
1207                                         le32_to_cpu(quad->diff));
1208
1209                                 if (element == 0) {
1210                                         span_set->log_start_lba = 0;
1211                                         span_set->log_end_lba =
1212                                                 ((span_row << raid->stripeShift)
1213                                                 * span_row_width) - 1;
1214
1215                                         span_set->span_row_start = 0;
1216                                         span_set->span_row_end = span_row - 1;
1217
1218                                         span_set->data_strip_start = 0;
1219                                         span_set->data_strip_end =
1220                                                 (span_row * span_row_width) - 1;
1221
1222                                         span_set->data_row_start = 0;
1223                                         span_set->data_row_end =
1224                                                 (span_row * le32_to_cpu(quad->diff)) - 1;
1225                                 } else {
1226                                         span_set_prev = &(ldSpanInfo[ld].
1227                                                         span_set[element - 1]);
1228                                         span_set->log_start_lba =
1229                                                 span_set_prev->log_end_lba + 1;
1230                                         span_set->log_end_lba =
1231                                                 span_set->log_start_lba +
1232                                                 ((span_row << raid->stripeShift)
1233                                                 * span_row_width) - 1;
1234
1235                                         span_set->span_row_start =
1236                                                 span_set_prev->span_row_end + 1;
1237                                         span_set->span_row_end =
1238                                         span_set->span_row_start + span_row - 1;
1239
1240                                         span_set->data_strip_start =
1241                                         span_set_prev->data_strip_end + 1;
1242                                         span_set->data_strip_end =
1243                                                 span_set->data_strip_start +
1244                                                 (span_row * span_row_width) - 1;
1245
1246                                         span_set->data_row_start =
1247                                                 span_set_prev->data_row_end + 1;
1248                                         span_set->data_row_end =
1249                                                 span_set->data_row_start +
1250                                                 (span_row * le32_to_cpu(quad->diff)) - 1;
1251                                 }
1252                                 break;
1253                 }
1254                 if (span == raid->spanDepth)
1255                         break;
1256             }
1257         }
1258 #if SPAN_DEBUG
1259         getSpanInfo(map, ldSpanInfo);
1260 #endif
1261
1262 }
1263
1264 void mr_update_load_balance_params(struct MR_DRV_RAID_MAP_ALL *drv_map,
1265         struct LD_LOAD_BALANCE_INFO *lbInfo)
1266 {
1267         int ldCount;
1268         u16 ld;
1269         struct MR_LD_RAID *raid;
1270
1271         if (lb_pending_cmds > 128 || lb_pending_cmds < 1)
1272                 lb_pending_cmds = LB_PENDING_CMDS_DEFAULT;
1273
1274         for (ldCount = 0; ldCount < MAX_LOGICAL_DRIVES_EXT; ldCount++) {
1275                 ld = MR_TargetIdToLdGet(ldCount, drv_map);
1276                 if (ld >= MAX_LOGICAL_DRIVES_EXT) {
1277                         lbInfo[ldCount].loadBalanceFlag = 0;
1278                         continue;
1279                 }
1280
1281                 raid = MR_LdRaidGet(ld, drv_map);
1282                 if ((raid->level != 1) ||
1283                         (raid->ldState != MR_LD_STATE_OPTIMAL)) {
1284                         lbInfo[ldCount].loadBalanceFlag = 0;
1285                         continue;
1286                 }
1287                 lbInfo[ldCount].loadBalanceFlag = 1;
1288         }
1289 }
1290
1291 u8 megasas_get_best_arm_pd(struct megasas_instance *instance,
1292         struct LD_LOAD_BALANCE_INFO *lbInfo, struct IO_REQUEST_INFO *io_info)
1293 {
1294         struct fusion_context *fusion;
1295         struct MR_LD_RAID  *raid;
1296         struct MR_DRV_RAID_MAP_ALL *drv_map;
1297         u16     pend0, pend1, ld;
1298         u64     diff0, diff1;
1299         u8      bestArm, pd0, pd1, span, arm;
1300         u32     arRef, span_row_size;
1301
1302         u64 block = io_info->ldStartBlock;
1303         u32 count = io_info->numBlocks;
1304
1305         span = ((io_info->span_arm & RAID_CTX_SPANARM_SPAN_MASK)
1306                         >> RAID_CTX_SPANARM_SPAN_SHIFT);
1307         arm = (io_info->span_arm & RAID_CTX_SPANARM_ARM_MASK);
1308
1309
1310         fusion = instance->ctrl_context;
1311         drv_map = fusion->ld_drv_map[(instance->map_id & 1)];
1312         ld = MR_TargetIdToLdGet(io_info->ldTgtId, drv_map);
1313         raid = MR_LdRaidGet(ld, drv_map);
1314         span_row_size = instance->UnevenSpanSupport ?
1315                         SPAN_ROW_SIZE(drv_map, ld, span) : raid->rowSize;
1316
1317         arRef = MR_LdSpanArrayGet(ld, span, drv_map);
1318         pd0 = MR_ArPdGet(arRef, arm, drv_map);
1319         pd1 = MR_ArPdGet(arRef, (arm + 1) >= span_row_size ?
1320                 (arm + 1 - span_row_size) : arm + 1, drv_map);
1321
1322         /* get the pending cmds for the data and mirror arms */
1323         pend0 = atomic_read(&lbInfo->scsi_pending_cmds[pd0]);
1324         pend1 = atomic_read(&lbInfo->scsi_pending_cmds[pd1]);
1325
1326         /* Determine the disk whose head is nearer to the req. block */
1327         diff0 = ABS_DIFF(block, lbInfo->last_accessed_block[pd0]);
1328         diff1 = ABS_DIFF(block, lbInfo->last_accessed_block[pd1]);
1329         bestArm = (diff0 <= diff1 ? arm : arm ^ 1);
1330
1331         if ((bestArm == arm && pend0 > pend1 + lb_pending_cmds)  ||
1332                         (bestArm != arm && pend1 > pend0 + lb_pending_cmds))
1333                 bestArm ^= 1;
1334
1335         /* Update the last accessed block on the correct pd */
1336         io_info->pd_after_lb = (bestArm == arm) ? pd0 : pd1;
1337         lbInfo->last_accessed_block[io_info->pd_after_lb] = block + count - 1;
1338         io_info->span_arm = (span << RAID_CTX_SPANARM_SPAN_SHIFT) | bestArm;
1339 #if SPAN_DEBUG
1340         if (arm != bestArm)
1341                 dev_dbg(&instance->pdev->dev, "LSI Debug R1 Load balance "
1342                         "occur - span 0x%x arm 0x%x bestArm 0x%x "
1343                         "io_info->span_arm 0x%x\n",
1344                         span, arm, bestArm, io_info->span_arm);
1345 #endif
1346         return io_info->pd_after_lb;
1347 }
1348
1349 __le16 get_updated_dev_handle(struct megasas_instance *instance,
1350         struct LD_LOAD_BALANCE_INFO *lbInfo, struct IO_REQUEST_INFO *io_info)
1351 {
1352         u8 arm_pd;
1353         __le16 devHandle;
1354         struct fusion_context *fusion;
1355         struct MR_DRV_RAID_MAP_ALL *drv_map;
1356
1357         fusion = instance->ctrl_context;
1358         drv_map = fusion->ld_drv_map[(instance->map_id & 1)];
1359
1360         /* get best new arm (PD ID) */
1361         arm_pd  = megasas_get_best_arm_pd(instance, lbInfo, io_info);
1362         devHandle = MR_PdDevHandleGet(arm_pd, drv_map);
1363         atomic_inc(&lbInfo->scsi_pending_cmds[arm_pd]);
1364         return devHandle;
1365 }