drivers/scsi/megaraid/megaraid_sas_fp.c

   1 /*
   2  *  Linux MegaRAID driver for SAS based RAID controllers
   3  *
   4  *  Copyright (c) 2009-2012  LSI Corporation.
   5  *
   6  *  This program is free software; you can redistribute it and/or
   7  *  modify it under the terms of the GNU General Public License
   8  *  as published by the Free Software Foundation; either version 2
   9  *  of the License, or (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  19  *
  20  *  FILE: megaraid_sas_fp.c
  21  *
  22  *  Authors: LSI Corporation
  23  *           Sumant Patro
  24  *           Varad Talamacki
  25  *           Manoj Jose
  26  *
  27  *  Send feedback to: <megaraidlinux@lsi.com>
  28  *
  29  *  Mail to: LSI Corporation, 1621 Barber Lane, Milpitas, CA 95035
  30  *     ATTN: Linuxraid
  31  */
  32
  33 #include <linux/kernel.h>
  34 #include <linux/types.h>
  35 #include <linux/pci.h>
  36 #include <linux/list.h>
  37 #include <linux/moduleparam.h>
  38 #include <linux/module.h>
  39 #include <linux/spinlock.h>
  40 #include <linux/interrupt.h>
  41 #include <linux/delay.h>
  42 #include <linux/uio.h>
  43 #include <linux/uaccess.h>
  44 #include <linux/fs.h>
  45 #include <linux/compat.h>
  46 #include <linux/blkdev.h>
  47 #include <linux/poll.h>
  48
  49 #include <scsi/scsi.h>
  50 #include <scsi/scsi_cmnd.h>
  51 #include <scsi/scsi_device.h>
  52 #include <scsi/scsi_host.h>
  53
  54 #include "megaraid_sas_fusion.h"
  55 #include "megaraid_sas.h"
  56 #include <asm/div64.h>
  57
  58 #define LB_PENDING_CMDS_DEFAULT 4
  59 static unsigned int lb_pending_cmds = LB_PENDING_CMDS_DEFAULT;
  60 module_param(lb_pending_cmds, int, S_IRUGO);
  61 MODULE_PARM_DESC(lb_pending_cmds, "Change raid-1 load balancing outstanding "
  62         "threshold. Valid Values are 1-128. Default: 4");
  63
  64
  65 #define ABS_DIFF(a, b)   (((a) > (b)) ? ((a) - (b)) : ((b) - (a)))
  66 #define MR_LD_STATE_OPTIMAL 3
  67 #define FALSE 0
  68 #define TRUE 1
  69
  70 #define SPAN_DEBUG 0
  71 #define SPAN_ROW_SIZE(map, ld, index_) (MR_LdSpanPtrGet(ld, index_, map)->spanRowSize)
  72 #define SPAN_ROW_DATA_SIZE(map_, ld, index_)   (MR_LdSpanPtrGet(ld, index_, map)->spanRowDataSize)
  73 #define SPAN_INVALID  0xff
  74
  75 /* Prototypes */
  76 static void mr_update_span_set(struct MR_DRV_RAID_MAP_ALL *map,
  77         PLD_SPAN_INFO ldSpanInfo);
  78 static u8 mr_spanset_get_phy_params(struct megasas_instance *instance, u32 ld,
  79         u64 stripRow, u16 stripRef, struct IO_REQUEST_INFO *io_info,
  80         struct RAID_CONTEXT *pRAID_Context, struct MR_DRV_RAID_MAP_ALL *map);
  81 static u64 get_row_from_strip(struct megasas_instance *instance, u32 ld,
  82         u64 strip, struct MR_DRV_RAID_MAP_ALL *map);
  83
  84 u32 mega_mod64(u64 dividend, u32 divisor)
  85 {
  86         u64 d;
  87         u32 remainder;
  88
  89         if (!divisor)
  90                 printk(KERN_ERR "megasas : DIVISOR is zero, in div fn\n");
  91         d = dividend;
  92         remainder = do_div(d, divisor);
  93         return remainder;
  94 }
  95
  96 /**
  97  * @param dividend    : Dividend
  98  * @param divisor    : Divisor
  99  *
 100  * @return quotient
 101  **/
 102 u64 mega_div64_32(uint64_t dividend, uint32_t divisor)
 103 {
 104         u32 remainder;
 105         u64 d;
 106
 107         if (!divisor)
 108                 printk(KERN_ERR "megasas : DIVISOR is zero in mod fn\n");
 109
 110         d = dividend;
 111         remainder = do_div(d, divisor);
 112
 113         return d;
 114 }
 115
 116 struct MR_LD_RAID *MR_LdRaidGet(u32 ld, struct MR_DRV_RAID_MAP_ALL *map)
 117 {
 118         return &map->raidMap.ldSpanMap[ld].ldRaid;
 119 }
 120
 121 static struct MR_SPAN_BLOCK_INFO *MR_LdSpanInfoGet(u32 ld,
 122                                                    struct MR_DRV_RAID_MAP_ALL
 123                                                    *map)
 124 {
 125         return &map->raidMap.ldSpanMap[ld].spanBlock[0];
 126 }
 127
 128 static u8 MR_LdDataArmGet(u32 ld, u32 armIdx, struct MR_DRV_RAID_MAP_ALL *map)
 129 {
 130         return map->raidMap.ldSpanMap[ld].dataArmMap[armIdx];
 131 }
 132
 133 u16 MR_ArPdGet(u32 ar, u32 arm, struct MR_DRV_RAID_MAP_ALL *map)
 134 {
 135         return le16_to_cpu(map->raidMap.arMapInfo[ar].pd[arm]);
 136 }
 137
 138 u16 MR_LdSpanArrayGet(u32 ld, u32 span, struct MR_DRV_RAID_MAP_ALL *map)
 139 {
 140         return le16_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].span.arrayRef);
 141 }
 142
 143 u16 MR_PdDevHandleGet(u32 pd, struct MR_DRV_RAID_MAP_ALL *map)
 144 {
 145         return map->raidMap.devHndlInfo[pd].curDevHdl;
 146 }
 147
 148 u16 MR_GetLDTgtId(u32 ld, struct MR_DRV_RAID_MAP_ALL *map)
 149 {
 150         return le16_to_cpu(map->raidMap.ldSpanMap[ld].ldRaid.targetId);
 151 }
 152
 153 u8 MR_TargetIdToLdGet(u32 ldTgtId, struct MR_DRV_RAID_MAP_ALL *map)
 154 {
 155         return map->raidMap.ldTgtIdToLd[ldTgtId];
 156 }
 157
 158 static struct MR_LD_SPAN *MR_LdSpanPtrGet(u32 ld, u32 span,
 159                                           struct MR_DRV_RAID_MAP_ALL *map)
 160 {
 161         return &map->raidMap.ldSpanMap[ld].spanBlock[span].span;
 162 }
 163
 164 /*
 165  * This function will Populate Driver Map using firmware raid map
 166  */
 167 void MR_PopulateDrvRaidMap(struct megasas_instance *instance)
 168 {
 169         struct fusion_context *fusion = instance->ctrl_context;
 170         struct MR_FW_RAID_MAP_ALL     *fw_map_old    = NULL;
 171         struct MR_FW_RAID_MAP         *pFwRaidMap    = NULL;
 172         int i;
 173
 174
 175         struct MR_DRV_RAID_MAP_ALL *drv_map =
 176                         fusion->ld_drv_map[(instance->map_id & 1)];
 177         struct MR_DRV_RAID_MAP *pDrvRaidMap = &drv_map->raidMap;
 178
 179         if (instance->supportmax256vd) {
 180                 memcpy(fusion->ld_drv_map[instance->map_id & 1],
 181                         fusion->ld_map[instance->map_id & 1],
 182                         fusion->current_map_sz);
 183                 /* New Raid map will not set totalSize, so keep expected value
 184                  * for legacy code in ValidateMapInfo
 185                  */
 186                 pDrvRaidMap->totalSize = sizeof(struct MR_FW_RAID_MAP_EXT);
 187         } else {
 188                 fw_map_old = (struct MR_FW_RAID_MAP_ALL *)
 189                         fusion->ld_map[(instance->map_id & 1)];
 190                 pFwRaidMap = &fw_map_old->raidMap;
 191
 192 #if VD_EXT_DEBUG
 193                 for (i = 0; i < pFwRaidMap->ldCount; i++) {
 194                         dev_dbg(&instance->pdev->dev, "(%d) :Index 0x%x "
 195                                 "Target Id 0x%x Seq Num 0x%x Size 0/%llx\n",
 196                                 instance->unique_id, i,
 197                                 fw_map_old->raidMap.ldSpanMap[i].ldRaid.targetId,
 198                                 fw_map_old->raidMap.ldSpanMap[i].ldRaid.seqNum,
 199                                 fw_map_old->raidMap.ldSpanMap[i].ldRaid.size);
 200                 }
 201 #endif
 202
 203                 memset(drv_map, 0, fusion->drv_map_sz);
 204                 pDrvRaidMap->totalSize = pFwRaidMap->totalSize;
 205                 pDrvRaidMap->ldCount = pFwRaidMap->ldCount;
 206                 pDrvRaidMap->fpPdIoTimeoutSec = pFwRaidMap->fpPdIoTimeoutSec;
 207                 for (i = 0; i < MAX_RAIDMAP_LOGICAL_DRIVES + MAX_RAIDMAP_VIEWS; i++)
 208                         pDrvRaidMap->ldTgtIdToLd[i] =
 209                                 (u8)pFwRaidMap->ldTgtIdToLd[i];
 210                 for (i = 0; i < pDrvRaidMap->ldCount; i++) {
 211                         pDrvRaidMap->ldSpanMap[i] = pFwRaidMap->ldSpanMap[i];
 212 #if VD_EXT_DEBUG
 213                         dev_dbg(&instance->pdev->dev,
 214                                 "pFwRaidMap->ldSpanMap[%d].ldRaid.targetId 0x%x "
 215                                 "pFwRaidMap->ldSpanMap[%d].ldRaid.seqNum 0x%x "
 216                                 "size 0x%x\n", i, i,
 217                                 pFwRaidMap->ldSpanMap[i].ldRaid.targetId,
 218                                 pFwRaidMap->ldSpanMap[i].ldRaid.seqNum,
 219                                 (u32)pFwRaidMap->ldSpanMap[i].ldRaid.rowSize);
 220                         dev_dbg(&instance->pdev->dev,
 221                                 "pDrvRaidMap->ldSpanMap[%d].ldRaid.targetId 0x%x "
 222                                 "pDrvRaidMap->ldSpanMap[%d].ldRaid.seqNum 0x%x "
 223                                 "size 0x%x\n", i, i,
 224                                 pDrvRaidMap->ldSpanMap[i].ldRaid.targetId,
 225                                 pDrvRaidMap->ldSpanMap[i].ldRaid.seqNum,
 226                                 (u32)pDrvRaidMap->ldSpanMap[i].ldRaid.rowSize);
 227                         dev_dbg(&instance->pdev->dev, "Driver raid map all %p "
 228                                 "raid map %p LD RAID MAP %p/%p\n", drv_map,
 229                                 pDrvRaidMap, &pFwRaidMap->ldSpanMap[i].ldRaid,
 230                                 &pDrvRaidMap->ldSpanMap[i].ldRaid);
 231 #endif
 232                 }
 233                 memcpy(pDrvRaidMap->arMapInfo, pFwRaidMap->arMapInfo,
 234                         sizeof(struct MR_ARRAY_INFO) * MAX_RAIDMAP_ARRAYS);
 235                 memcpy(pDrvRaidMap->devHndlInfo, pFwRaidMap->devHndlInfo,
 236                         sizeof(struct MR_DEV_HANDLE_INFO) *
 237                         MAX_RAIDMAP_PHYSICAL_DEVICES);
 238         }
 239 }
 240
 241 /*
 242  * This function will validate Map info data provided by FW
 243  */
 244 u8 MR_ValidateMapInfo(struct megasas_instance *instance)
 245 {
 246         struct fusion_context *fusion;
 247         struct MR_DRV_RAID_MAP_ALL *drv_map;
 248         struct MR_DRV_RAID_MAP *pDrvRaidMap;
 249         struct LD_LOAD_BALANCE_INFO *lbInfo;
 250         PLD_SPAN_INFO ldSpanInfo;
 251         struct MR_LD_RAID         *raid;
 252         int ldCount, num_lds;
 253         u16 ld;
 254         u32 expected_size;
 255
 256
 257         MR_PopulateDrvRaidMap(instance);
 258
 259         fusion = instance->ctrl_context;
 260         drv_map = fusion->ld_drv_map[(instance->map_id & 1)];
 261         pDrvRaidMap = &drv_map->raidMap;
 262
 263         lbInfo = fusion->load_balance_info;
 264         ldSpanInfo = fusion->log_to_span;
 265
 266         if (instance->supportmax256vd)
 267                 expected_size = sizeof(struct MR_FW_RAID_MAP_EXT);
 268         else
 269                 expected_size =
 270                         (sizeof(struct MR_FW_RAID_MAP) - sizeof(struct MR_LD_SPAN_MAP) +
 271                         (sizeof(struct MR_LD_SPAN_MAP) * le32_to_cpu(pDrvRaidMap->ldCount)));
 272
 273         if (le32_to_cpu(pDrvRaidMap->totalSize) != expected_size) {
 274                 dev_err(&instance->pdev->dev, "map info structure size 0x%x is not matching with ld count\n",
 275                        (unsigned int) expected_size);
 276                 dev_err(&instance->pdev->dev, "megasas: span map %x, pDrvRaidMap->totalSize : %x\n",
 277                         (unsigned int)sizeof(struct MR_LD_SPAN_MAP),
 278                         le32_to_cpu(pDrvRaidMap->totalSize));
 279                 return 0;
 280         }
 281
 282         if (instance->UnevenSpanSupport)
 283                 mr_update_span_set(drv_map, ldSpanInfo);
 284
 285         mr_update_load_balance_params(drv_map, lbInfo);
 286
 287         num_lds = le32_to_cpu(drv_map->raidMap.ldCount);
 288
 289         /*Convert Raid capability values to CPU arch */
 290         for (ldCount = 0; ldCount < num_lds; ldCount++) {
 291                 ld = MR_TargetIdToLdGet(ldCount, drv_map);
 292                 raid = MR_LdRaidGet(ld, drv_map);
 293                 le32_to_cpus((u32 *)&raid->capability);
 294         }
 295
 296         return 1;
 297 }
 298
 299 u32 MR_GetSpanBlock(u32 ld, u64 row, u64 *span_blk,
 300                     struct MR_DRV_RAID_MAP_ALL *map)
 301 {
 302         struct MR_SPAN_BLOCK_INFO *pSpanBlock = MR_LdSpanInfoGet(ld, map);
 303         struct MR_QUAD_ELEMENT    *quad;
 304         struct MR_LD_RAID         *raid = MR_LdRaidGet(ld, map);
 305         u32                span, j;
 306
 307         for (span = 0; span < raid->spanDepth; span++, pSpanBlock++) {
 308
 309                 for (j = 0; j < le32_to_cpu(pSpanBlock->block_span_info.noElements); j++) {
 310                         quad = &pSpanBlock->block_span_info.quad[j];
 311
 312                         if (le32_to_cpu(quad->diff) == 0)
 313                                 return SPAN_INVALID;
 314                         if (le64_to_cpu(quad->logStart) <= row && row <=
 315                                 le64_to_cpu(quad->logEnd) && (mega_mod64(row - le64_to_cpu(quad->logStart),
 316                                 le32_to_cpu(quad->diff))) == 0) {
 317                                 if (span_blk != NULL) {
 318                                         u64  blk, debugBlk;
 319                                         blk =  mega_div64_32((row-le64_to_cpu(quad->logStart)), le32_to_cpu(quad->diff));
 320                                         debugBlk = blk;
 321
 322                                         blk = (blk + le64_to_cpu(quad->offsetInSpan)) << raid->stripeShift;
 323                                         *span_blk = blk;
 324                                 }
 325                                 return span;
 326                         }
 327                 }
 328         }
 329         return SPAN_INVALID;
 330 }
 331
 332 /*
 333 ******************************************************************************
 334 *
 335 * Function to print info about span set created in driver from FW raid map
 336 *
 337 * Inputs :
 338 * map    - LD map
 339 * ldSpanInfo - ldSpanInfo per HBA instance
 340 */
 341 #if SPAN_DEBUG
 342 static int getSpanInfo(struct MR_DRV_RAID_MAP_ALL *map,
 343         PLD_SPAN_INFO ldSpanInfo)
 344 {
 345
 346         u8   span;
 347         u32    element;
 348         struct MR_LD_RAID *raid;
 349         LD_SPAN_SET *span_set;
 350         struct MR_QUAD_ELEMENT    *quad;
 351         int ldCount;
 352         u16 ld;
 353
 354         for (ldCount = 0; ldCount < MAX_LOGICAL_DRIVES_EXT; ldCount++) {
 355                 ld = MR_TargetIdToLdGet(ldCount, map);
 356                         if (ld >= MAX_LOGICAL_DRIVES_EXT)
 357                                 continue;
 358                 raid = MR_LdRaidGet(ld, map);
 359                 dev_dbg(&instance->pdev->dev, "LD %x: span_depth=%x\n",
 360                         ld, raid->spanDepth);
 361                 for (span = 0; span < raid->spanDepth; span++)
 362                         dev_dbg(&instance->pdev->dev, "Span=%x,"
 363                         " number of quads=%x\n", span,
 364                         le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
 365                         block_span_info.noElements));
 366                 for (element = 0; element < MAX_QUAD_DEPTH; element++) {
 367                         span_set = &(ldSpanInfo[ld].span_set[element]);
 368                         if (span_set->span_row_data_width == 0)
 369                                 break;
 370
 371                         dev_dbg(&instance->pdev->dev, "Span Set %x:"
 372                                 "width=%x, diff=%x\n", element,
 373                                 (unsigned int)span_set->span_row_data_width,
 374                                 (unsigned int)span_set->diff);
 375                         dev_dbg(&instance->pdev->dev, "logical LBA"
 376                                 "start=0x%08lx, end=0x%08lx\n",
 377                                 (long unsigned int)span_set->log_start_lba,
 378                                 (long unsigned int)span_set->log_end_lba);
 379                         dev_dbg(&instance->pdev->dev, "span row start=0x%08lx,"
 380                                 " end=0x%08lx\n",
 381                                 (long unsigned int)span_set->span_row_start,
 382                                 (long unsigned int)span_set->span_row_end);
 383                         dev_dbg(&instance->pdev->dev, "data row start=0x%08lx,"
 384                                 " end=0x%08lx\n",
 385                                 (long unsigned int)span_set->data_row_start,
 386                                 (long unsigned int)span_set->data_row_end);
 387                         dev_dbg(&instance->pdev->dev, "data strip start=0x%08lx,"
 388                                 " end=0x%08lx\n",
 389                                 (long unsigned int)span_set->data_strip_start,
 390                                 (long unsigned int)span_set->data_strip_end);
 391
 392                         for (span = 0; span < raid->spanDepth; span++) {
 393                                 if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
 394                                         block_span_info.noElements) >=
 395                                         element + 1) {
 396                                         quad = &map->raidMap.ldSpanMap[ld].
 397                                                 spanBlock[span].block_span_info.
 398                                                 quad[element];
 399                                 dev_dbg(&instance->pdev->dev, "Span=%x,"
 400                                         "Quad=%x, diff=%x\n", span,
 401                                         element, le32_to_cpu(quad->diff));
 402                                 dev_dbg(&instance->pdev->dev,
 403                                         "offset_in_span=0x%08lx\n",
 404                                         (long unsigned int)le64_to_cpu(quad->offsetInSpan));
 405                                 dev_dbg(&instance->pdev->dev,
 406                                         "logical start=0x%08lx, end=0x%08lx\n",
 407                                         (long unsigned int)le64_to_cpu(quad->logStart),
 408                                         (long unsigned int)le64_to_cpu(quad->logEnd));
 409                                 }
 410                         }
 411                 }
 412         }
 413         return 0;
 414 }
 415 #endif
 416
 417 /*
 418 ******************************************************************************
 419 *
 420 * This routine calculates the Span block for given row using spanset.
 421 *
 422 * Inputs :
 423 *    instance - HBA instance
 424 *    ld   - Logical drive number
 425 *    row        - Row number
 426 *    map    - LD map
 427 *
 428 * Outputs :
 429 *
 430 *    span          - Span number
 431 *    block         - Absolute Block number in the physical disk
 432 *    div_error     - Devide error code.
 433 */
 434
 435 u32 mr_spanset_get_span_block(struct megasas_instance *instance,
 436                 u32 ld, u64 row, u64 *span_blk, struct MR_DRV_RAID_MAP_ALL *map)
 437 {
 438         struct fusion_context *fusion = instance->ctrl_context;
 439         struct MR_LD_RAID         *raid = MR_LdRaidGet(ld, map);
 440         LD_SPAN_SET *span_set;
 441         struct MR_QUAD_ELEMENT    *quad;
 442         u32    span, info;
 443         PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span;
 444
 445         for (info = 0; info < MAX_QUAD_DEPTH; info++) {
 446                 span_set = &(ldSpanInfo[ld].span_set[info]);
 447
 448                 if (span_set->span_row_data_width == 0)
 449                         break;
 450
 451                 if (row > span_set->data_row_end)
 452                         continue;
 453
 454                 for (span = 0; span < raid->spanDepth; span++)
 455                         if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
 456                                 block_span_info.noElements) >= info+1) {
 457                                 quad = &map->raidMap.ldSpanMap[ld].
 458                                         spanBlock[span].
 459                                         block_span_info.quad[info];
 460                                 if (le32_to_cpu(quad->diff == 0))
 461                                         return SPAN_INVALID;
 462                                 if (le64_to_cpu(quad->logStart) <= row  &&
 463                                         row <= le64_to_cpu(quad->logEnd)  &&
 464                                         (mega_mod64(row - le64_to_cpu(quad->logStart),
 465                                                 le32_to_cpu(quad->diff))) == 0) {
 466                                         if (span_blk != NULL) {
 467                                                 u64  blk;
 468                                                 blk = mega_div64_32
 469                                                     ((row - le64_to_cpu(quad->logStart)),
 470                                                     le32_to_cpu(quad->diff));
 471                                                 blk = (blk + le64_to_cpu(quad->offsetInSpan))
 472                                                          << raid->stripeShift;
 473                                                 *span_blk = blk;
 474                                         }
 475                                         return span;
 476                                 }
 477                         }
 478         }
 479         return SPAN_INVALID;
 480 }
 481
 482 /*
 483 ******************************************************************************
 484 *
 485 * This routine calculates the row for given strip using spanset.
 486 *
 487 * Inputs :
 488 *    instance - HBA instance
 489 *    ld   - Logical drive number
 490 *    Strip        - Strip
 491 *    map    - LD map
 492 *
 493 * Outputs :
 494 *
 495 *    row         - row associated with strip
 496 */
 497
 498 static u64  get_row_from_strip(struct megasas_instance *instance,
 499         u32 ld, u64 strip, struct MR_DRV_RAID_MAP_ALL *map)
 500 {
 501         struct fusion_context *fusion = instance->ctrl_context;
 502         struct MR_LD_RAID       *raid = MR_LdRaidGet(ld, map);
 503         LD_SPAN_SET     *span_set;
 504         PLD_SPAN_INFO   ldSpanInfo = fusion->log_to_span;
 505         u32             info, strip_offset, span, span_offset;
 506         u64             span_set_Strip, span_set_Row, retval;
 507
 508         for (info = 0; info < MAX_QUAD_DEPTH; info++) {
 509                 span_set = &(ldSpanInfo[ld].span_set[info]);
 510
 511                 if (span_set->span_row_data_width == 0)
 512                         break;
 513                 if (strip > span_set->data_strip_end)
 514                         continue;
 515
 516                 span_set_Strip = strip - span_set->data_strip_start;
 517                 strip_offset = mega_mod64(span_set_Strip,
 518                                 span_set->span_row_data_width);
 519                 span_set_Row = mega_div64_32(span_set_Strip,
 520                                 span_set->span_row_data_width) * span_set->diff;
 521                 for (span = 0, span_offset = 0; span < raid->spanDepth; span++)
 522                         if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
 523                                 block_span_info.noElements >= info+1)) {
 524                                 if (strip_offset >=
 525                                         span_set->strip_offset[span])
 526                                         span_offset++;
 527                                 else
 528                                         break;
 529                         }
 530 #if SPAN_DEBUG
 531                 dev_info(&instance->pdev->dev, "Strip 0x%llx,"
 532                         "span_set_Strip 0x%llx, span_set_Row 0x%llx"
 533                         "data width 0x%llx span offset 0x%x\n", strip,
 534                         (unsigned long long)span_set_Strip,
 535                         (unsigned long long)span_set_Row,
 536                         (unsigned long long)span_set->span_row_data_width,
 537                         span_offset);
 538                 dev_info(&instance->pdev->dev, "For strip 0x%llx"
 539                         "row is 0x%llx\n", strip,
 540                         (unsigned long long) span_set->data_row_start +
 541                         (unsigned long long) span_set_Row + (span_offset - 1));
 542 #endif
 543                 retval = (span_set->data_row_start + span_set_Row +
 544                                 (span_offset - 1));
 545                 return retval;
 546         }
 547         return -1LLU;
 548 }
 549
 550
 551 /*
 552 ******************************************************************************
 553 *
 554 * This routine calculates the Start Strip for given row using spanset.
 555 *
 556 * Inputs :
 557 *    instance - HBA instance
 558 *    ld   - Logical drive number
 559 *    row        - Row number
 560 *    map    - LD map
 561 *
 562 * Outputs :
 563 *
 564 *    Strip         - Start strip associated with row
 565 */
 566
 567 static u64 get_strip_from_row(struct megasas_instance *instance,
 568                 u32 ld, u64 row, struct MR_DRV_RAID_MAP_ALL *map)
 569 {
 570         struct fusion_context *fusion = instance->ctrl_context;
 571         struct MR_LD_RAID         *raid = MR_LdRaidGet(ld, map);
 572         LD_SPAN_SET *span_set;
 573         struct MR_QUAD_ELEMENT    *quad;
 574         PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span;
 575         u32    span, info;
 576         u64  strip;
 577
 578         for (info = 0; info < MAX_QUAD_DEPTH; info++) {
 579                 span_set = &(ldSpanInfo[ld].span_set[info]);
 580
 581                 if (span_set->span_row_data_width == 0)
 582                         break;
 583                 if (row > span_set->data_row_end)
 584                         continue;
 585
 586                 for (span = 0; span < raid->spanDepth; span++)
 587                         if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
 588                                 block_span_info.noElements) >= info+1) {
 589                                 quad = &map->raidMap.ldSpanMap[ld].
 590                                         spanBlock[span].block_span_info.quad[info];
 591                                 if (le64_to_cpu(quad->logStart) <= row  &&
 592                                         row <= le64_to_cpu(quad->logEnd)  &&
 593                                         mega_mod64((row - le64_to_cpu(quad->logStart)),
 594                                         le32_to_cpu(quad->diff)) == 0) {
 595                                         strip = mega_div64_32
 596                                                 (((row - span_set->data_row_start)
 597                                                         - le64_to_cpu(quad->logStart)),
 598                                                         le32_to_cpu(quad->diff));
 599                                         strip *= span_set->span_row_data_width;
 600                                         strip += span_set->data_strip_start;
 601                                         strip += span_set->strip_offset[span];
 602                                         return strip;
 603                                 }
 604                         }
 605         }
 606         dev_err(&instance->pdev->dev, "get_strip_from_row"
 607                 "returns invalid strip for ld=%x, row=%lx\n",
 608                 ld, (long unsigned int)row);
 609         return -1;
 610 }
 611
 612 /*
 613 ******************************************************************************
 614 *
 615 * This routine calculates the Physical Arm for given strip using spanset.
 616 *
 617 * Inputs :
 618 *    instance - HBA instance
 619 *    ld   - Logical drive number
 620 *    strip      - Strip
 621 *    map    - LD map
 622 *
 623 * Outputs :
 624 *
 625 *    Phys Arm         - Phys Arm associated with strip
 626 */
 627
 628 static u32 get_arm_from_strip(struct megasas_instance *instance,
 629         u32 ld, u64 strip, struct MR_DRV_RAID_MAP_ALL *map)
 630 {
 631         struct fusion_context *fusion = instance->ctrl_context;
 632         struct MR_LD_RAID         *raid = MR_LdRaidGet(ld, map);
 633         LD_SPAN_SET *span_set;
 634         PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span;
 635         u32    info, strip_offset, span, span_offset, retval;
 636
 637         for (info = 0 ; info < MAX_QUAD_DEPTH; info++) {
 638                 span_set = &(ldSpanInfo[ld].span_set[info]);
 639
 640                 if (span_set->span_row_data_width == 0)
 641                         break;
 642                 if (strip > span_set->data_strip_end)
 643                         continue;
 644
 645                 strip_offset = (uint)mega_mod64
 646                                 ((strip - span_set->data_strip_start),
 647                                 span_set->span_row_data_width);
 648
 649                 for (span = 0, span_offset = 0; span < raid->spanDepth; span++)
 650                         if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
 651                                 block_span_info.noElements) >= info+1) {
 652                                 if (strip_offset >=
 653                                         span_set->strip_offset[span])
 654                                         span_offset =
 655                                                 span_set->strip_offset[span];
 656                                 else
 657                                         break;
 658                         }
 659 #if SPAN_DEBUG
 660                 dev_info(&instance->pdev->dev, "get_arm_from_strip:"
 661                         "for ld=0x%x strip=0x%lx arm is  0x%x\n", ld,
 662                         (long unsigned int)strip, (strip_offset - span_offset));
 663 #endif
 664                 retval = (strip_offset - span_offset);
 665                 return retval;
 666         }
 667
 668         dev_err(&instance->pdev->dev, "get_arm_from_strip"
 669                 "returns invalid arm for ld=%x strip=%lx\n",
 670                 ld, (long unsigned int)strip);
 671
 672         return -1;
 673 }
 674
 675 /* This Function will return Phys arm */
 676 u8 get_arm(struct megasas_instance *instance, u32 ld, u8 span, u64 stripe,
 677                 struct MR_DRV_RAID_MAP_ALL *map)
 678 {
 679         struct MR_LD_RAID  *raid = MR_LdRaidGet(ld, map);
 680         /* Need to check correct default value */
 681         u32    arm = 0;
 682
 683         switch (raid->level) {
 684         case 0:
 685         case 5:
 686         case 6:
 687                 arm = mega_mod64(stripe, SPAN_ROW_SIZE(map, ld, span));
 688                 break;
 689         case 1:
 690                 /* start with logical arm */
 691                 arm = get_arm_from_strip(instance, ld, stripe, map);
 692                 if (arm != -1U)
 693                         arm *= 2;
 694                 break;
 695         }
 696
 697         return arm;
 698 }
 699
 700
 701 /*
 702 ******************************************************************************
 703 *
 704 * This routine calculates the arm, span and block for the specified stripe and
 705 * reference in stripe using spanset
 706 *
 707 * Inputs :
 708 *
 709 *    ld   - Logical drive number
 710 *    stripRow        - Stripe number
 711 *    stripRef    - Reference in stripe
 712 *
 713 * Outputs :
 714 *
 715 *    span          - Span number
 716 *    block         - Absolute Block number in the physical disk
 717 */
 718 static u8 mr_spanset_get_phy_params(struct megasas_instance *instance, u32 ld,
 719                 u64 stripRow, u16 stripRef, struct IO_REQUEST_INFO *io_info,
 720                 struct RAID_CONTEXT *pRAID_Context,
 721                 struct MR_DRV_RAID_MAP_ALL *map)
 722 {
 723         struct MR_LD_RAID  *raid = MR_LdRaidGet(ld, map);
 724         u32     pd, arRef;
 725         u8      physArm, span;
 726         u64     row;
 727         u8      retval = TRUE;
 728         u8      do_invader = 0;
 729         u64     *pdBlock = &io_info->pdBlock;
 730         u16     *pDevHandle = &io_info->devHandle;
 731         u32     logArm, rowMod, armQ, arm;
 732
 733         if ((instance->pdev->device == PCI_DEVICE_ID_LSI_INVADER ||
 734                 instance->pdev->device == PCI_DEVICE_ID_LSI_FURY))
 735                 do_invader = 1;
 736
 737         /*Get row and span from io_info for Uneven Span IO.*/
 738         row         = io_info->start_row;
 739         span        = io_info->start_span;
 740
 741
 742         if (raid->level == 6) {
 743                 logArm = get_arm_from_strip(instance, ld, stripRow, map);
 744                 if (logArm == -1U)
 745                         return FALSE;
 746                 rowMod = mega_mod64(row, SPAN_ROW_SIZE(map, ld, span));
 747                 armQ = SPAN_ROW_SIZE(map, ld, span) - 1 - rowMod;
 748                 arm = armQ + 1 + logArm;
 749                 if (arm >= SPAN_ROW_SIZE(map, ld, span))
 750                         arm -= SPAN_ROW_SIZE(map, ld, span);
 751                 physArm = (u8)arm;
 752         } else
 753                 /* Calculate the arm */
 754                 physArm = get_arm(instance, ld, span, stripRow, map);
 755         if (physArm == 0xFF)
 756                 return FALSE;
 757
 758         arRef       = MR_LdSpanArrayGet(ld, span, map);
 759         pd          = MR_ArPdGet(arRef, physArm, map);
 760
 761         if (pd != MR_PD_INVALID)
 762                 *pDevHandle = MR_PdDevHandleGet(pd, map);
 763         else {
 764                 *pDevHandle = MR_PD_INVALID;
 765                 if ((raid->level >= 5) &&
 766                         (!do_invader  || (do_invader &&
 767                         (raid->regTypeReqOnRead != REGION_TYPE_UNUSED))))
 768                         pRAID_Context->regLockFlags = REGION_TYPE_EXCLUSIVE;
 769                 else if (raid->level == 1) {
 770                         pd = MR_ArPdGet(arRef, physArm + 1, map);
 771                         if (pd != MR_PD_INVALID)
 772                                 *pDevHandle = MR_PdDevHandleGet(pd, map);
 773                 }
 774         }
 775
 776         *pdBlock += stripRef + le64_to_cpu(MR_LdSpanPtrGet(ld, span, map)->startBlk);
 777         pRAID_Context->spanArm = (span << RAID_CTX_SPANARM_SPAN_SHIFT) |
 778                                         physArm;
 779         io_info->span_arm = pRAID_Context->spanArm;
 780         return retval;
 781 }
 782
 783 /*
 784 ******************************************************************************
 785 *
 786 * This routine calculates the arm, span and block for the specified stripe and
 787 * reference in stripe.
 788 *
 789 * Inputs :
 790 *
 791 *    ld   - Logical drive number
 792 *    stripRow        - Stripe number
 793 *    stripRef    - Reference in stripe
 794 *
 795 * Outputs :
 796 *
 797 *    span          - Span number
 798 *    block         - Absolute Block number in the physical disk
 799 */
 800 u8 MR_GetPhyParams(struct megasas_instance *instance, u32 ld, u64 stripRow,
 801                 u16 stripRef, struct IO_REQUEST_INFO *io_info,
 802                 struct RAID_CONTEXT *pRAID_Context,
 803                 struct MR_DRV_RAID_MAP_ALL *map)
 804 {
 805         struct MR_LD_RAID  *raid = MR_LdRaidGet(ld, map);
 806         u32         pd, arRef;
 807         u8          physArm, span;
 808         u64         row;
 809         u8          retval = TRUE;
 810         u8          do_invader = 0;
 811         u64         *pdBlock = &io_info->pdBlock;
 812         u16         *pDevHandle = &io_info->devHandle;
 813
 814         if ((instance->pdev->device == PCI_DEVICE_ID_LSI_INVADER ||
 815                 instance->pdev->device == PCI_DEVICE_ID_LSI_FURY))
 816                 do_invader = 1;
 817
 818         row =  mega_div64_32(stripRow, raid->rowDataSize);
 819
 820         if (raid->level == 6) {
 821                 /* logical arm within row */
 822                 u32 logArm =  mega_mod64(stripRow, raid->rowDataSize);
 823                 u32 rowMod, armQ, arm;
 824
 825                 if (raid->rowSize == 0)
 826                         return FALSE;
 827                 /* get logical row mod */
 828                 rowMod = mega_mod64(row, raid->rowSize);
 829                 armQ = raid->rowSize-1-rowMod; /* index of Q drive */
 830                 arm = armQ+1+logArm; /* data always logically follows Q */
 831                 if (arm >= raid->rowSize) /* handle wrap condition */
 832                         arm -= raid->rowSize;
 833                 physArm = (u8)arm;
 834         } else  {
 835                 if (raid->modFactor == 0)
 836                         return FALSE;
 837                 physArm = MR_LdDataArmGet(ld,  mega_mod64(stripRow,
 838                                                           raid->modFactor),
 839                                           map);
 840         }
 841
 842         if (raid->spanDepth == 1) {
 843                 span = 0;
 844                 *pdBlock = row << raid->stripeShift;
 845         } else {
 846                 span = (u8)MR_GetSpanBlock(ld, row, pdBlock, map);
 847                 if (span == SPAN_INVALID)
 848                         return FALSE;
 849         }
 850
 851         /* Get the array on which this span is present */
 852         arRef       = MR_LdSpanArrayGet(ld, span, map);
 853         pd          = MR_ArPdGet(arRef, physArm, map); /* Get the pd */
 854
 855         if (pd != MR_PD_INVALID)
 856                 /* Get dev handle from Pd. */
 857                 *pDevHandle = MR_PdDevHandleGet(pd, map);
 858         else {
 859                 *pDevHandle = MR_PD_INVALID; /* set dev handle as invalid. */
 860                 if ((raid->level >= 5) &&
 861                         (!do_invader  || (do_invader &&
 862                         (raid->regTypeReqOnRead != REGION_TYPE_UNUSED))))
 863                         pRAID_Context->regLockFlags = REGION_TYPE_EXCLUSIVE;
 864                 else if (raid->level == 1) {
 865                         /* Get alternate Pd. */
 866                         pd = MR_ArPdGet(arRef, physArm + 1, map);
 867                         if (pd != MR_PD_INVALID)
 868                                 /* Get dev handle from Pd */
 869                                 *pDevHandle = MR_PdDevHandleGet(pd, map);
 870                 }
 871         }
 872
 873         *pdBlock += stripRef + le64_to_cpu(MR_LdSpanPtrGet(ld, span, map)->startBlk);
 874         pRAID_Context->spanArm = (span << RAID_CTX_SPANARM_SPAN_SHIFT) |
 875                 physArm;
 876         io_info->span_arm = pRAID_Context->spanArm;
 877         return retval;
 878 }
 879
 880 /*
 881 ******************************************************************************
 882 *
 883 * MR_BuildRaidContext function
 884 *
 885 * This function will initiate command processing.  The start/end row and strip
 886 * information is calculated then the lock is acquired.
 887 * This function will return 0 if region lock was acquired OR return num strips
 888 */
 889 u8
 890 MR_BuildRaidContext(struct megasas_instance *instance,
 891                     struct IO_REQUEST_INFO *io_info,
 892                     struct RAID_CONTEXT *pRAID_Context,
 893                     struct MR_DRV_RAID_MAP_ALL *map, u8 **raidLUN)
 894 {
 895         struct MR_LD_RAID  *raid;
 896         u32         ld, stripSize, stripe_mask;
 897         u64         endLba, endStrip, endRow, start_row, start_strip;
 898         u64         regStart;
 899         u32         regSize;
 900         u8          num_strips, numRows;
 901         u16         ref_in_start_stripe, ref_in_end_stripe;
 902         u64         ldStartBlock;
 903         u32         numBlocks, ldTgtId;
 904         u8          isRead;
 905         u8          retval = 0;
 906         u8          startlba_span = SPAN_INVALID;
 907         u64 *pdBlock = &io_info->pdBlock;
 908
 909         ldStartBlock = io_info->ldStartBlock;
 910         numBlocks = io_info->numBlocks;
 911         ldTgtId = io_info->ldTgtId;
 912         isRead = io_info->isRead;
 913         io_info->IoforUnevenSpan = 0;
 914         io_info->start_span     = SPAN_INVALID;
 915
 916         ld = MR_TargetIdToLdGet(ldTgtId, map);
 917         raid = MR_LdRaidGet(ld, map);
 918
 919         /*
 920          * if rowDataSize @RAID map and spanRowDataSize @SPAN INFO are zero
 921          * return FALSE
 922          */
 923         if (raid->rowDataSize == 0) {
 924                 if (MR_LdSpanPtrGet(ld, 0, map)->spanRowDataSize == 0)
 925                         return FALSE;
 926                 else if (instance->UnevenSpanSupport) {
 927                         io_info->IoforUnevenSpan = 1;
 928                 } else {
 929                         dev_info(&instance->pdev->dev,
 930                                 "raid->rowDataSize is 0, but has SPAN[0]"
 931                                 "rowDataSize = 0x%0x,"
 932                                 "but there is _NO_ UnevenSpanSupport\n",
 933                                 MR_LdSpanPtrGet(ld, 0, map)->spanRowDataSize);
 934                         return FALSE;
 935                 }
 936         }
 937
 938         stripSize = 1 << raid->stripeShift;
 939         stripe_mask = stripSize-1;
 940
 941
 942         /*
 943          * calculate starting row and stripe, and number of strips and rows
 944          */
 945         start_strip         = ldStartBlock >> raid->stripeShift;
 946         ref_in_start_stripe = (u16)(ldStartBlock & stripe_mask);
 947         endLba              = ldStartBlock + numBlocks - 1;
 948         ref_in_end_stripe   = (u16)(endLba & stripe_mask);
 949         endStrip            = endLba >> raid->stripeShift;
 950         num_strips          = (u8)(endStrip - start_strip + 1); /* End strip */
 951
 952         if (io_info->IoforUnevenSpan) {
 953                 start_row = get_row_from_strip(instance, ld, start_strip, map);
 954                 endRow    = get_row_from_strip(instance, ld, endStrip, map);
 955                 if (start_row == -1ULL || endRow == -1ULL) {
 956                         dev_info(&instance->pdev->dev, "return from %s %d."
 957                                 "Send IO w/o region lock.\n",
 958                                 __func__, __LINE__);
 959                         return FALSE;
 960                 }
 961
 962                 if (raid->spanDepth == 1) {
 963                         startlba_span = 0;
 964                         *pdBlock = start_row << raid->stripeShift;
 965                 } else
 966                         startlba_span = (u8)mr_spanset_get_span_block(instance,
 967                                                 ld, start_row, pdBlock, map);
 968                 if (startlba_span == SPAN_INVALID) {
 969                         dev_info(&instance->pdev->dev, "return from %s %d"
 970                                 "for row 0x%llx,start strip %llx"
 971                                 "endSrip %llx\n", __func__, __LINE__,
 972                                 (unsigned long long)start_row,
 973                                 (unsigned long long)start_strip,
 974                                 (unsigned long long)endStrip);
 975                         return FALSE;
 976                 }
 977                 io_info->start_span     = startlba_span;
 978                 io_info->start_row      = start_row;
 979 #if SPAN_DEBUG
 980                 dev_dbg(&instance->pdev->dev, "Check Span number from %s %d"
 981                         "for row 0x%llx, start strip 0x%llx end strip 0x%llx"
 982                         " span 0x%x\n", __func__, __LINE__,
 983                         (unsigned long long)start_row,
 984                         (unsigned long long)start_strip,
 985                         (unsigned long long)endStrip, startlba_span);
 986                 dev_dbg(&instance->pdev->dev, "start_row 0x%llx endRow 0x%llx"
 987                         "Start span 0x%x\n", (unsigned long long)start_row,
 988                         (unsigned long long)endRow, startlba_span);
 989 #endif
 990         } else {
 991                 start_row = mega_div64_32(start_strip, raid->rowDataSize);
 992                 endRow    = mega_div64_32(endStrip, raid->rowDataSize);
 993         }
 994         numRows = (u8)(endRow - start_row + 1);
 995
 996         /*
 997          * calculate region info.
 998          */
 999
1000         /* assume region is at the start of the first row */
1001         regStart            = start_row << raid->stripeShift;
1002         /* assume this IO needs the full row - we'll adjust if not true */
1003         regSize             = stripSize;
1004
1005         /* Check if we can send this I/O via FastPath */
1006         if (raid->capability.fpCapable) {
1007                 if (isRead)
1008                         io_info->fpOkForIo = (raid->capability.fpReadCapable &&
1009                                               ((num_strips == 1) ||
1010                                                raid->capability.
1011                                                fpReadAcrossStripe));
1012                 else
1013                         io_info->fpOkForIo = (raid->capability.fpWriteCapable &&
1014                                               ((num_strips == 1) ||
1015                                                raid->capability.
1016                                                fpWriteAcrossStripe));
1017         } else
1018                 io_info->fpOkForIo = FALSE;
1019
1020         if (numRows == 1) {
1021                 /* single-strip IOs can always lock only the data needed */
1022                 if (num_strips == 1) {
1023                         regStart += ref_in_start_stripe;
1024                         regSize = numBlocks;
1025                 }
1026                 /* multi-strip IOs always need to full stripe locked */
1027         } else if (io_info->IoforUnevenSpan == 0) {
1028                 /*
1029                  * For Even span region lock optimization.
1030                  * If the start strip is the last in the start row
1031                  */
1032                 if (start_strip == (start_row + 1) * raid->rowDataSize - 1) {
1033                         regStart += ref_in_start_stripe;
1034                         /* initialize count to sectors from startref to end
1035                            of strip */
1036                         regSize = stripSize - ref_in_start_stripe;
1037                 }
1038
1039                 /* add complete rows in the middle of the transfer */
1040                 if (numRows > 2)
1041                         regSize += (numRows-2) << raid->stripeShift;
1042
1043                 /* if IO ends within first strip of last row*/
1044                 if (endStrip == endRow*raid->rowDataSize)
1045                         regSize += ref_in_end_stripe+1;
1046                 else
1047                         regSize += stripSize;
1048         } else {
1049                 /*
1050                  * For Uneven span region lock optimization.
1051                  * If the start strip is the last in the start row
1052                  */
1053                 if (start_strip == (get_strip_from_row(instance, ld, start_row, map) +
1054                                 SPAN_ROW_DATA_SIZE(map, ld, startlba_span) - 1)) {
1055                         regStart += ref_in_start_stripe;
1056                         /* initialize count to sectors from
1057                          * startRef to end of strip
1058                          */
1059                         regSize = stripSize - ref_in_start_stripe;
1060                 }
1061                 /* Add complete rows in the middle of the transfer*/
1062
1063                 if (numRows > 2)
1064                         /* Add complete rows in the middle of the transfer*/
1065                         regSize += (numRows-2) << raid->stripeShift;
1066
1067                 /* if IO ends within first strip of last row */
1068                 if (endStrip == get_strip_from_row(instance, ld, endRow, map))
1069                         regSize += ref_in_end_stripe + 1;
1070                 else
1071                         regSize += stripSize;
1072         }
1073
1074         pRAID_Context->timeoutValue =
1075                 cpu_to_le16(raid->fpIoTimeoutForLd ?
1076                             raid->fpIoTimeoutForLd :
1077                             map->raidMap.fpPdIoTimeoutSec);
1078         if ((instance->pdev->device == PCI_DEVICE_ID_LSI_INVADER) ||
1079                 (instance->pdev->device == PCI_DEVICE_ID_LSI_FURY))
1080                 pRAID_Context->regLockFlags = (isRead) ?
1081                         raid->regTypeReqOnRead : raid->regTypeReqOnWrite;
1082         else
1083                 pRAID_Context->regLockFlags = (isRead) ?
1084                         REGION_TYPE_SHARED_READ : raid->regTypeReqOnWrite;
1085         pRAID_Context->VirtualDiskTgtId = raid->targetId;
1086         pRAID_Context->regLockRowLBA    = cpu_to_le64(regStart);
1087         pRAID_Context->regLockLength    = cpu_to_le32(regSize);
1088         pRAID_Context->configSeqNum     = raid->seqNum;
1089         /* save pointer to raid->LUN array */
1090         *raidLUN = raid->LUN;
1091
1092
1093         /*Get Phy Params only if FP capable, or else leave it to MR firmware
1094           to do the calculation.*/
1095         if (io_info->fpOkForIo) {
1096                 retval = io_info->IoforUnevenSpan ?
1097                                 mr_spanset_get_phy_params(instance, ld,
1098                                         start_strip, ref_in_start_stripe,
1099                                         io_info, pRAID_Context, map) :
1100                                 MR_GetPhyParams(instance, ld, start_strip,
1101                                         ref_in_start_stripe, io_info,
1102                                         pRAID_Context, map);
1103                 /* If IO on an invalid Pd, then FP is not possible.*/
1104                 if (io_info->devHandle == MR_PD_INVALID)
1105                         io_info->fpOkForIo = FALSE;
1106                 return retval;
1107         } else if (isRead) {
1108                 uint stripIdx;
1109                 for (stripIdx = 0; stripIdx < num_strips; stripIdx++) {
1110                         retval = io_info->IoforUnevenSpan ?
1111                                 mr_spanset_get_phy_params(instance, ld,
1112                                     start_strip + stripIdx,
1113                                     ref_in_start_stripe, io_info,
1114                                     pRAID_Context, map) :
1115                                 MR_GetPhyParams(instance, ld,
1116                                     start_strip + stripIdx, ref_in_start_stripe,
1117                                     io_info, pRAID_Context, map);
1118                         if (!retval)
1119                                 return TRUE;
1120                 }
1121         }
1122
1123 #if SPAN_DEBUG
1124         /* Just for testing what arm we get for strip.*/
1125         if (io_info->IoforUnevenSpan)
1126                 get_arm_from_strip(instance, ld, start_strip, map);
1127 #endif
1128         return TRUE;
1129 }
1130
1131 /*
1132 ******************************************************************************
1133 *
1134 * This routine pepare spanset info from Valid Raid map and store it into
1135 * local copy of ldSpanInfo per instance data structure.
1136 *
1137 * Inputs :
1138 * map    - LD map
1139 * ldSpanInfo - ldSpanInfo per HBA instance
1140 *
1141 */
1142 void mr_update_span_set(struct MR_DRV_RAID_MAP_ALL *map,
1143         PLD_SPAN_INFO ldSpanInfo)
1144 {
1145         u8   span, count;
1146         u32  element, span_row_width;
1147         u64  span_row;
1148         struct MR_LD_RAID *raid;
1149         LD_SPAN_SET *span_set, *span_set_prev;
1150         struct MR_QUAD_ELEMENT    *quad;
1151         int ldCount;
1152         u16 ld;
1153
1154
1155         for (ldCount = 0; ldCount < MAX_LOGICAL_DRIVES_EXT; ldCount++) {
1156                 ld = MR_TargetIdToLdGet(ldCount, map);
1157                 if (ld >= MAX_LOGICAL_DRIVES_EXT)
1158                         continue;
1159                 raid = MR_LdRaidGet(ld, map);
1160                 for (element = 0; element < MAX_QUAD_DEPTH; element++) {
1161                         for (span = 0; span < raid->spanDepth; span++) {
1162                                 if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
1163                                         block_span_info.noElements) <
1164                                         element + 1)
1165                                         continue;
1166                                 span_set = &(ldSpanInfo[ld].span_set[element]);
1167                                 quad = &map->raidMap.ldSpanMap[ld].
1168                                         spanBlock[span].block_span_info.
1169                                         quad[element];
1170
1171                                 span_set->diff = le32_to_cpu(quad->diff);
1172
1173                                 for (count = 0, span_row_width = 0;
1174                                         count < raid->spanDepth; count++) {
1175                                         if (le32_to_cpu(map->raidMap.ldSpanMap[ld].
1176                                                 spanBlock[count].
1177                                                 block_span_info.
1178                                                 noElements) >= element + 1) {
1179                                                 span_set->strip_offset[count] =
1180                                                         span_row_width;
1181                                                 span_row_width +=
1182                                                         MR_LdSpanPtrGet
1183                                                         (ld, count, map)->spanRowDataSize;
1184                                                 printk(KERN_INFO "megasas:"
1185                                                         "span %x rowDataSize %x\n",
1186                                                         count, MR_LdSpanPtrGet
1187                                                         (ld, count, map)->spanRowDataSize);
1188                                         }
1189                                 }
1190
1191                                 span_set->span_row_data_width = span_row_width;
1192                                 span_row = mega_div64_32(((le64_to_cpu(quad->logEnd) -
1193                                         le64_to_cpu(quad->logStart)) + le32_to_cpu(quad->diff)),
1194                                         le32_to_cpu(quad->diff));
1195
1196                                 if (element == 0) {
1197                                         span_set->log_start_lba = 0;
1198                                         span_set->log_end_lba =
1199                                                 ((span_row << raid->stripeShift)
1200                                                 * span_row_width) - 1;
1201
1202                                         span_set->span_row_start = 0;
1203                                         span_set->span_row_end = span_row - 1;
1204
1205                                         span_set->data_strip_start = 0;
1206                                         span_set->data_strip_end =
1207                                                 (span_row * span_row_width) - 1;
1208
1209                                         span_set->data_row_start = 0;
1210                                         span_set->data_row_end =
1211                                                 (span_row * le32_to_cpu(quad->diff)) - 1;
1212                                 } else {
1213                                         span_set_prev = &(ldSpanInfo[ld].
1214                                                         span_set[element - 1]);
1215                                         span_set->log_start_lba =
1216                                                 span_set_prev->log_end_lba + 1;
1217                                         span_set->log_end_lba =
1218                                                 span_set->log_start_lba +
1219                                                 ((span_row << raid->stripeShift)
1220                                                 * span_row_width) - 1;
1221
1222                                         span_set->span_row_start =
1223                                                 span_set_prev->span_row_end + 1;
1224                                         span_set->span_row_end =
1225                                         span_set->span_row_start + span_row - 1;
1226
1227                                         span_set->data_strip_start =
1228                                         span_set_prev->data_strip_end + 1;
1229                                         span_set->data_strip_end =
1230                                                 span_set->data_strip_start +
1231                                                 (span_row * span_row_width) - 1;
1232
1233                                         span_set->data_row_start =
1234                                                 span_set_prev->data_row_end + 1;
1235                                         span_set->data_row_end =
1236                                                 span_set->data_row_start +
1237                                                 (span_row * le32_to_cpu(quad->diff)) - 1;
1238                                 }
1239                                 break;
1240                 }
1241                 if (span == raid->spanDepth)
1242                         break;
1243             }
1244         }
1245 #if SPAN_DEBUG
1246         getSpanInfo(map, ldSpanInfo);
1247 #endif
1248
1249 }
1250
1251 void mr_update_load_balance_params(struct MR_DRV_RAID_MAP_ALL *drv_map,
1252         struct LD_LOAD_BALANCE_INFO *lbInfo)
1253 {
1254         int ldCount;
1255         u16 ld;
1256         struct MR_LD_RAID *raid;
1257
1258         if (lb_pending_cmds > 128 || lb_pending_cmds < 1)
1259                 lb_pending_cmds = LB_PENDING_CMDS_DEFAULT;
1260
1261         for (ldCount = 0; ldCount < MAX_LOGICAL_DRIVES_EXT; ldCount++) {
1262                 ld = MR_TargetIdToLdGet(ldCount, drv_map);
1263                 if (ld >= MAX_LOGICAL_DRIVES_EXT) {
1264                         lbInfo[ldCount].loadBalanceFlag = 0;
1265                         continue;
1266                 }
1267
1268                 raid = MR_LdRaidGet(ld, drv_map);
1269                 if ((raid->level != 1) ||
1270                         (raid->ldState != MR_LD_STATE_OPTIMAL)) {
1271                         lbInfo[ldCount].loadBalanceFlag = 0;
1272                         continue;
1273                 }
1274                 lbInfo[ldCount].loadBalanceFlag = 1;
1275         }
1276 }
1277
1278 u8 megasas_get_best_arm_pd(struct megasas_instance *instance,
1279         struct LD_LOAD_BALANCE_INFO *lbInfo, struct IO_REQUEST_INFO *io_info)
1280 {
1281         struct fusion_context *fusion;
1282         struct MR_LD_RAID  *raid;
1283         struct MR_DRV_RAID_MAP_ALL *drv_map;
1284         u16     pend0, pend1, ld;
1285         u64     diff0, diff1;
1286         u8      bestArm, pd0, pd1, span, arm;
1287         u32     arRef, span_row_size;
1288
1289         u64 block = io_info->ldStartBlock;
1290         u32 count = io_info->numBlocks;
1291
1292         span = ((io_info->span_arm & RAID_CTX_SPANARM_SPAN_MASK)
1293                         >> RAID_CTX_SPANARM_SPAN_SHIFT);
1294         arm = (io_info->span_arm & RAID_CTX_SPANARM_ARM_MASK);
1295
1296
1297         fusion = instance->ctrl_context;
1298         drv_map = fusion->ld_drv_map[(instance->map_id & 1)];
1299         ld = MR_TargetIdToLdGet(io_info->ldTgtId, drv_map);
1300         raid = MR_LdRaidGet(ld, drv_map);
1301         span_row_size = instance->UnevenSpanSupport ?
1302                         SPAN_ROW_SIZE(drv_map, ld, span) : raid->rowSize;
1303
1304         arRef = MR_LdSpanArrayGet(ld, span, drv_map);
1305         pd0 = MR_ArPdGet(arRef, arm, drv_map);
1306         pd1 = MR_ArPdGet(arRef, (arm + 1) >= span_row_size ?
1307                 (arm + 1 - span_row_size) : arm + 1, drv_map);
1308
1309         /* get the pending cmds for the data and mirror arms */
1310         pend0 = atomic_read(&lbInfo->scsi_pending_cmds[pd0]);
1311         pend1 = atomic_read(&lbInfo->scsi_pending_cmds[pd1]);
1312
1313         /* Determine the disk whose head is nearer to the req. block */
1314         diff0 = ABS_DIFF(block, lbInfo->last_accessed_block[pd0]);
1315         diff1 = ABS_DIFF(block, lbInfo->last_accessed_block[pd1]);
1316         bestArm = (diff0 <= diff1 ? arm : arm ^ 1);
1317
1318         if ((bestArm == arm && pend0 > pend1 + lb_pending_cmds)  ||
1319                         (bestArm != arm && pend1 > pend0 + lb_pending_cmds))
1320                 bestArm ^= 1;
1321
1322         /* Update the last accessed block on the correct pd */
1323         io_info->pd_after_lb = (bestArm == arm) ? pd0 : pd1;
1324         lbInfo->last_accessed_block[io_info->pd_after_lb] = block + count - 1;
1325         io_info->span_arm = (span << RAID_CTX_SPANARM_SPAN_SHIFT) | bestArm;
1326 #if SPAN_DEBUG
1327         if (arm != bestArm)
1328                 dev_dbg(&instance->pdev->dev, "LSI Debug R1 Load balance "
1329                         "occur - span 0x%x arm 0x%x bestArm 0x%x "
1330                         "io_info->span_arm 0x%x\n",
1331                         span, arm, bestArm, io_info->span_arm);
1332 #endif
1333         return io_info->pd_after_lb;
1334 }
1335
1336 u16 get_updated_dev_handle(struct megasas_instance *instance,
1337         struct LD_LOAD_BALANCE_INFO *lbInfo, struct IO_REQUEST_INFO *io_info)
1338 {
1339         u8 arm_pd;
1340         u16 devHandle;
1341         struct fusion_context *fusion;
1342         struct MR_DRV_RAID_MAP_ALL *drv_map;
1343
1344         fusion = instance->ctrl_context;
1345         drv_map = fusion->ld_drv_map[(instance->map_id & 1)];
1346
1347         /* get best new arm (PD ID) */
1348         arm_pd  = megasas_get_best_arm_pd(instance, lbInfo, io_info);
1349         devHandle = MR_PdDevHandleGet(arm_pd, drv_map);
1350         atomic_inc(&lbInfo->scsi_pending_cmds[arm_pd]);
1351         return devHandle;
1352 }