drivers/scsi/megaraid/megaraid_sas_fp.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Linux MegaRAID driver for SAS based RAID controllers
   4  *
   5  *  Copyright (c) 2009-2013  LSI Corporation
   6  *  Copyright (c) 2013-2016  Avago Technologies
   7  *  Copyright (c) 2016-2018  Broadcom Inc.
   8  *
   9  *  FILE: megaraid_sas_fp.c
  10  *
  11  *  Authors: Broadcom Inc.
  12  *           Sumant Patro
  13  *           Varad Talamacki
  14  *           Manoj Jose
  15  *           Kashyap Desai <kashyap.desai@broadcom.com>
  16  *           Sumit Saxena <sumit.saxena@broadcom.com>
  17  *
  18  *  Send feedback to: megaraidlinux.pdl@broadcom.com
  19  */
  20
  21 #include <linux/kernel.h>
  22 #include <linux/types.h>
  23 #include <linux/pci.h>
  24 #include <linux/list.h>
  25 #include <linux/moduleparam.h>
  26 #include <linux/module.h>
  27 #include <linux/spinlock.h>
  28 #include <linux/interrupt.h>
  29 #include <linux/delay.h>
  30 #include <linux/uio.h>
  31 #include <linux/uaccess.h>
  32 #include <linux/fs.h>
  33 #include <linux/compat.h>
  34 #include <linux/blkdev.h>
  35 #include <linux/poll.h>
  36 #include <linux/irq_poll.h>
  37
  38 #include <scsi/scsi.h>
  39 #include <scsi/scsi_cmnd.h>
  40 #include <scsi/scsi_device.h>
  41 #include <scsi/scsi_host.h>
  42
  43 #include "megaraid_sas_fusion.h"
  44 #include "megaraid_sas.h"
  45 #include <asm/div64.h>
  46
  47 #define LB_PENDING_CMDS_DEFAULT 4
  48 static unsigned int lb_pending_cmds = LB_PENDING_CMDS_DEFAULT;
  49 module_param(lb_pending_cmds, int, 0444);
  50 MODULE_PARM_DESC(lb_pending_cmds, "Change raid-1 load balancing outstanding "
  51         "threshold. Valid Values are 1-128. Default: 4");
  52
  53
  54 #define ABS_DIFF(a, b)   (((a) > (b)) ? ((a) - (b)) : ((b) - (a)))
  55 #define MR_LD_STATE_OPTIMAL 3
  56
  57 #define SPAN_ROW_SIZE(map, ld, index_) (MR_LdSpanPtrGet(ld, index_, map)->spanRowSize)
  58 #define SPAN_ROW_DATA_SIZE(map_, ld, index_)   (MR_LdSpanPtrGet(ld, index_, map)->spanRowDataSize)
  59 #define SPAN_INVALID  0xff
  60
  61 /* Prototypes */
  62 static void mr_update_span_set(struct MR_DRV_RAID_MAP_ALL *map,
  63         PLD_SPAN_INFO ldSpanInfo);
  64 static u8 mr_spanset_get_phy_params(struct megasas_instance *instance, u32 ld,
  65         u64 stripRow, u16 stripRef, struct IO_REQUEST_INFO *io_info,
  66         struct RAID_CONTEXT *pRAID_Context, struct MR_DRV_RAID_MAP_ALL *map);
  67 static u64 get_row_from_strip(struct megasas_instance *instance, u32 ld,
  68         u64 strip, struct MR_DRV_RAID_MAP_ALL *map);
  69
  70 u32 mega_mod64(u64 dividend, u32 divisor)
  71 {
  72         u64 d;
  73         u32 remainder;
  74
  75         if (!divisor)
  76                 printk(KERN_ERR "megasas : DIVISOR is zero, in div fn\n");
  77         d = dividend;
  78         remainder = do_div(d, divisor);
  79         return remainder;
  80 }
  81
  82 /**
  83  * mega_div64_32 - Do a 64-bit division
  84  * @dividend:   Dividend
  85  * @divisor:    Divisor
  86  *
  87  * @return quotient
  88  **/
  89 static u64 mega_div64_32(uint64_t dividend, uint32_t divisor)
  90 {
  91         u64 d = dividend;
  92
  93         if (!divisor)
  94                 printk(KERN_ERR "megasas : DIVISOR is zero in mod fn\n");
  95
  96         do_div(d, divisor);
  97
  98         return d;
  99 }
 100
 101 struct MR_LD_RAID *MR_LdRaidGet(u32 ld, struct MR_DRV_RAID_MAP_ALL *map)
 102 {
 103         return &map->raidMap.ldSpanMap[ld].ldRaid;
 104 }
 105
 106 static struct MR_SPAN_BLOCK_INFO *MR_LdSpanInfoGet(u32 ld,
 107                                                    struct MR_DRV_RAID_MAP_ALL
 108                                                    *map)
 109 {
 110         return &map->raidMap.ldSpanMap[ld].spanBlock[0];
 111 }
 112
 113 static u8 MR_LdDataArmGet(u32 ld, u32 armIdx, struct MR_DRV_RAID_MAP_ALL *map)
 114 {
 115         return map->raidMap.ldSpanMap[ld].dataArmMap[armIdx];
 116 }
 117
 118 u16 MR_ArPdGet(u32 ar, u32 arm, struct MR_DRV_RAID_MAP_ALL *map)
 119 {
 120         return le16_to_cpu(map->raidMap.arMapInfo[ar].pd[arm]);
 121 }
 122
 123 u16 MR_LdSpanArrayGet(u32 ld, u32 span, struct MR_DRV_RAID_MAP_ALL *map)
 124 {
 125         return le16_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].span.arrayRef);
 126 }
 127
 128 __le16 MR_PdDevHandleGet(u32 pd, struct MR_DRV_RAID_MAP_ALL *map)
 129 {
 130         return map->raidMap.devHndlInfo[pd].curDevHdl;
 131 }
 132
 133 static u8 MR_PdInterfaceTypeGet(u32 pd, struct MR_DRV_RAID_MAP_ALL *map)
 134 {
 135         return map->raidMap.devHndlInfo[pd].interfaceType;
 136 }
 137
 138 u16 MR_GetLDTgtId(u32 ld, struct MR_DRV_RAID_MAP_ALL *map)
 139 {
 140         return le16_to_cpu(map->raidMap.ldSpanMap[ld].ldRaid.targetId);
 141 }
 142
 143 u16 MR_TargetIdToLdGet(u32 ldTgtId, struct MR_DRV_RAID_MAP_ALL *map)
 144 {
 145         return map->raidMap.ldTgtIdToLd[ldTgtId];
 146 }
 147
 148 static struct MR_LD_SPAN *MR_LdSpanPtrGet(u32 ld, u32 span,
 149                                           struct MR_DRV_RAID_MAP_ALL *map)
 150 {
 151         return &map->raidMap.ldSpanMap[ld].spanBlock[span].span;
 152 }
 153
 154 /*
 155  * This function will Populate Driver Map using firmware raid map
 156  */
 157 static int MR_PopulateDrvRaidMap(struct megasas_instance *instance, u64 map_id)
 158 {
 159         struct fusion_context *fusion = instance->ctrl_context;
 160         struct MR_FW_RAID_MAP_ALL     *fw_map_old    = NULL;
 161         struct MR_FW_RAID_MAP         *pFwRaidMap    = NULL;
 162         int i, j;
 163         u16 ld_count;
 164         struct MR_FW_RAID_MAP_DYNAMIC *fw_map_dyn;
 165         struct MR_FW_RAID_MAP_EXT *fw_map_ext;
 166         struct MR_RAID_MAP_DESC_TABLE *desc_table;
 167
 168
 169         struct MR_DRV_RAID_MAP_ALL *drv_map =
 170                         fusion->ld_drv_map[(map_id & 1)];
 171         struct MR_DRV_RAID_MAP *pDrvRaidMap = &drv_map->raidMap;
 172         void *raid_map_data = NULL;
 173
 174         memset(drv_map, 0, fusion->drv_map_sz);
 175         memset(pDrvRaidMap->ldTgtIdToLd,
 176                0xff, (sizeof(u16) * MAX_LOGICAL_DRIVES_DYN));
 177
 178         if (instance->max_raid_mapsize) {
 179                 fw_map_dyn = fusion->ld_map[(map_id & 1)];
 180                 desc_table =
 181                 (struct MR_RAID_MAP_DESC_TABLE *)((void *)fw_map_dyn + le32_to_cpu(fw_map_dyn->desc_table_offset));
 182                 if (desc_table != fw_map_dyn->raid_map_desc_table)
 183                         dev_dbg(&instance->pdev->dev, "offsets of desc table are not matching desc %p original %p\n",
 184                                 desc_table, fw_map_dyn->raid_map_desc_table);
 185
 186                 ld_count = (u16)le16_to_cpu(fw_map_dyn->ld_count);
 187                 pDrvRaidMap->ldCount = (__le16)cpu_to_le16(ld_count);
 188                 pDrvRaidMap->fpPdIoTimeoutSec =
 189                         fw_map_dyn->fp_pd_io_timeout_sec;
 190                 pDrvRaidMap->totalSize =
 191                         cpu_to_le32(sizeof(struct MR_DRV_RAID_MAP_ALL));
 192                 /* point to actual data starting point*/
 193                 raid_map_data = (void *)fw_map_dyn +
 194                         le32_to_cpu(fw_map_dyn->desc_table_offset) +
 195                         le32_to_cpu(fw_map_dyn->desc_table_size);
 196
 197                 for (i = 0; i < le32_to_cpu(fw_map_dyn->desc_table_num_elements); ++i) {
 198                         switch (le32_to_cpu(desc_table->raid_map_desc_type)) {
 199                         case RAID_MAP_DESC_TYPE_DEVHDL_INFO:
 200                                 fw_map_dyn->dev_hndl_info =
 201                                 (struct MR_DEV_HANDLE_INFO *)(raid_map_data + le32_to_cpu(desc_table->raid_map_desc_offset));
 202                                 memcpy(pDrvRaidMap->devHndlInfo,
 203                                         fw_map_dyn->dev_hndl_info,
 204                                         sizeof(struct MR_DEV_HANDLE_INFO) *
 205                                         le32_to_cpu(desc_table->raid_map_desc_elements));
 206                         break;
 207                         case RAID_MAP_DESC_TYPE_TGTID_INFO:
 208                                 fw_map_dyn->ld_tgt_id_to_ld =
 209                                         (u16 *)(raid_map_data +
 210                                         le32_to_cpu(desc_table->raid_map_desc_offset));
 211                                 for (j = 0; j < le32_to_cpu(desc_table->raid_map_desc_elements); j++) {
 212                                         pDrvRaidMap->ldTgtIdToLd[j] =
 213                                                 le16_to_cpu(fw_map_dyn->ld_tgt_id_to_ld[j]);
 214                                 }
 215                         break;
 216                         case RAID_MAP_DESC_TYPE_ARRAY_INFO:
 217                                 fw_map_dyn->ar_map_info =
 218                                         (struct MR_ARRAY_INFO *)
 219                                         (raid_map_data + le32_to_cpu(desc_table->raid_map_desc_offset));
 220                                 memcpy(pDrvRaidMap->arMapInfo,
 221                                        fw_map_dyn->ar_map_info,
 222                                        sizeof(struct MR_ARRAY_INFO) *
 223                                        le32_to_cpu(desc_table->raid_map_desc_elements));
 224                         break;
 225                         case RAID_MAP_DESC_TYPE_SPAN_INFO:
 226                                 fw_map_dyn->ld_span_map =
 227                                         (struct MR_LD_SPAN_MAP *)
 228                                         (raid_map_data +
 229                                         le32_to_cpu(desc_table->raid_map_desc_offset));
 230                                 memcpy(pDrvRaidMap->ldSpanMap,
 231                                        fw_map_dyn->ld_span_map,
 232                                        sizeof(struct MR_LD_SPAN_MAP) *
 233                                        le32_to_cpu(desc_table->raid_map_desc_elements));
 234                         break;
 235                         default:
 236                                 dev_dbg(&instance->pdev->dev, "wrong number of desctableElements %d\n",
 237                                         fw_map_dyn->desc_table_num_elements);
 238                         }
 239                         ++desc_table;
 240                 }
 241
 242         } else if (instance->supportmax256vd) {
 243                 fw_map_ext =
 244                         (struct MR_FW_RAID_MAP_EXT *)fusion->ld_map[(map_id & 1)];
 245                 ld_count = (u16)le16_to_cpu(fw_map_ext->ldCount);
 246                 if (ld_count > MAX_LOGICAL_DRIVES_EXT) {
 247                         dev_dbg(&instance->pdev->dev, "megaraid_sas: LD count exposed in RAID map in not valid\n");
 248                         return 1;
 249                 }
 250
 251                 pDrvRaidMap->ldCount = (__le16)cpu_to_le16(ld_count);
 252                 pDrvRaidMap->fpPdIoTimeoutSec = fw_map_ext->fpPdIoTimeoutSec;
 253                 for (i = 0; i < (MAX_LOGICAL_DRIVES_EXT); i++)
 254                         pDrvRaidMap->ldTgtIdToLd[i] =
 255                                 (u16)fw_map_ext->ldTgtIdToLd[i];
 256                 memcpy(pDrvRaidMap->ldSpanMap, fw_map_ext->ldSpanMap,
 257                        sizeof(struct MR_LD_SPAN_MAP) * ld_count);
 258                 memcpy(pDrvRaidMap->arMapInfo, fw_map_ext->arMapInfo,
 259                        sizeof(struct MR_ARRAY_INFO) * MAX_API_ARRAYS_EXT);
 260                 memcpy(pDrvRaidMap->devHndlInfo, fw_map_ext->devHndlInfo,
 261                        sizeof(struct MR_DEV_HANDLE_INFO) *
 262                        MAX_RAIDMAP_PHYSICAL_DEVICES);
 263
 264                 /* New Raid map will not set totalSize, so keep expected value
 265                  * for legacy code in ValidateMapInfo
 266                  */
 267                 pDrvRaidMap->totalSize =
 268                         cpu_to_le32(sizeof(struct MR_FW_RAID_MAP_EXT));
 269         } else {
 270                 fw_map_old = (struct MR_FW_RAID_MAP_ALL *)
 271                                 fusion->ld_map[(map_id & 1)];
 272                 pFwRaidMap = &fw_map_old->raidMap;
 273                 ld_count = (u16)le32_to_cpu(pFwRaidMap->ldCount);
 274                 if (ld_count > MAX_LOGICAL_DRIVES) {
 275                         dev_dbg(&instance->pdev->dev,
 276                                 "LD count exposed in RAID map in not valid\n");
 277                         return 1;
 278                 }
 279
 280                 pDrvRaidMap->totalSize = pFwRaidMap->totalSize;
 281                 pDrvRaidMap->ldCount = (__le16)cpu_to_le16(ld_count);
 282                 pDrvRaidMap->fpPdIoTimeoutSec = pFwRaidMap->fpPdIoTimeoutSec;
 283                 for (i = 0; i < MAX_RAIDMAP_LOGICAL_DRIVES + MAX_RAIDMAP_VIEWS; i++)
 284                         pDrvRaidMap->ldTgtIdToLd[i] =
 285                                 (u8)pFwRaidMap->ldTgtIdToLd[i];
 286                 for (i = 0; i < ld_count; i++) {
 287                         pDrvRaidMap->ldSpanMap[i] = pFwRaidMap->ldSpanMap[i];
 288                 }
 289                 memcpy(pDrvRaidMap->arMapInfo, pFwRaidMap->arMapInfo,
 290                         sizeof(struct MR_ARRAY_INFO) * MAX_RAIDMAP_ARRAYS);
 291                 memcpy(pDrvRaidMap->devHndlInfo, pFwRaidMap->devHndlInfo,
 292                         sizeof(struct MR_DEV_HANDLE_INFO) *
 293                         MAX_RAIDMAP_PHYSICAL_DEVICES);
 294         }
 295
 296         return 0;
 297 }
 298
 299 /*
 300  * This function will validate Map info data provided by FW
 301  */
 302 u8 MR_ValidateMapInfo(struct megasas_instance *instance, u64 map_id)
 303 {
 304         struct fusion_context *fusion;
 305         struct MR_DRV_RAID_MAP_ALL *drv_map;
 306         struct MR_DRV_RAID_MAP *pDrvRaidMap;
 307         struct LD_LOAD_BALANCE_INFO *lbInfo;
 308         PLD_SPAN_INFO ldSpanInfo;
 309         struct MR_LD_RAID         *raid;
 310         u16 num_lds, i;
 311         u16 ld;
 312         u32 expected_size;
 313
 314         if (MR_PopulateDrvRaidMap(instance, map_id))
 315                 return 0;
 316
 317         fusion = instance->ctrl_context;
 318         drv_map = fusion->ld_drv_map[(map_id & 1)];
 319         pDrvRaidMap = &drv_map->raidMap;
 320
 321         lbInfo = fusion->load_balance_info;
 322         ldSpanInfo = fusion->log_to_span;
 323
 324         if (instance->max_raid_mapsize)
 325                 expected_size = sizeof(struct MR_DRV_RAID_MAP_ALL);
 326         else if (instance->supportmax256vd)
 327                 expected_size = sizeof(struct MR_FW_RAID_MAP_EXT);
 328         else
 329                 expected_size =
 330                         (sizeof(struct MR_FW_RAID_MAP) - sizeof(struct MR_LD_SPAN_MAP) +
 331                         (sizeof(struct MR_LD_SPAN_MAP) * le16_to_cpu(pDrvRaidMap->ldCount)));
 332
 333         if (le32_to_cpu(pDrvRaidMap->totalSize) != expected_size) {
 334                 dev_dbg(&instance->pdev->dev, "megasas: map info structure size 0x%x",
 335                         le32_to_cpu(pDrvRaidMap->totalSize));
 336                 dev_dbg(&instance->pdev->dev, "is not matching expected size 0x%x\n",
 337                         (unsigned int)expected_size);
 338                 dev_err(&instance->pdev->dev, "megasas: span map %x, pDrvRaidMap->totalSize : %x\n",
 339                         (unsigned int)sizeof(struct MR_LD_SPAN_MAP),
 340                         le32_to_cpu(pDrvRaidMap->totalSize));
 341                 return 0;
 342         }
 343
 344         if (instance->UnevenSpanSupport)
 345                 mr_update_span_set(drv_map, ldSpanInfo);
 346
 347         if (lbInfo)
 348                 mr_update_load_balance_params(drv_map, lbInfo);
 349
 350         num_lds = le16_to_cpu(drv_map->raidMap.ldCount);
 351
 352         /*Convert Raid capability values to CPU arch */
 353         for (i = 0; (num_lds > 0) && (i < MAX_LOGICAL_DRIVES_EXT); i++) {
 354                 ld = MR_TargetIdToLdGet(i, drv_map);
 355
 356                 /* For non existing VDs, iterate to next VD*/
 357                 if (ld >= (MAX_LOGICAL_DRIVES_EXT - 1))
 358                         continue;
 359
 360                 raid = MR_LdRaidGet(ld, drv_map);
 361                 le32_to_cpus((u32 *)&raid->capability);
 362
 363                 num_lds--;
 364         }
 365
 366         return 1;
 367 }
 368
 369 static u32 MR_GetSpanBlock(u32 ld, u64 row, u64 *span_blk,
 370                     struct MR_DRV_RAID_MAP_ALL *map)
 371 {
 372         struct MR_SPAN_BLOCK_INFO *pSpanBlock = MR_LdSpanInfoGet(ld, map);
 373         struct MR_QUAD_ELEMENT    *quad;
 374         struct MR_LD_RAID         *raid = MR_LdRaidGet(ld, map);
 375         u32                span, j;
 376
 377         for (span = 0; span < raid->spanDepth; span++, pSpanBlock++) {
 378
 379                 for (j = 0; j < le32_to_cpu(pSpanBlock->block_span_info.noElements); j++) {
 380                         quad = &pSpanBlock->block_span_info.quad[j];
 381
 382                         if (le32_to_cpu(quad->diff) == 0)
 383                                 return SPAN_INVALID;
 384                         if (le64_to_cpu(quad->logStart) <= row && row <=
 385                                 le64_to_cpu(quad->logEnd) && (mega_mod64(row - le64_to_cpu(quad->logStart),
 386                                 le32_to_cpu(quad->diff))) == 0) {
 387                                 if (span_blk != NULL) {
 388                                         u64  blk;
 389                                         blk =  mega_div64_32((row-le64_to_cpu(quad->logStart)), le32_to_cpu(quad->diff));
 390
 391                                         blk = (blk + le64_to_cpu(quad->offsetInSpan)) << raid->stripeShift;
 392                                         *span_blk = blk;
 393                                 }
 394                                 return span;
 395                         }
 396                 }
 397         }
 398         return SPAN_INVALID;
 399 }
 400
 401 /*
 402 ******************************************************************************
 403 *
 404 * This routine calculates the Span block for given row using spanset.
 405 *
 406 * Inputs :
 407 *    instance - HBA instance
 408 *    ld   - Logical drive number
 409 *    row        - Row number
 410 *    map    - LD map
 411 *
 412 * Outputs :
 413 *
 414 *    span          - Span number
 415 *    block         - Absolute Block number in the physical disk
 416 *    div_error     - Devide error code.
 417 */
 418
 419 static u32 mr_spanset_get_span_block(struct megasas_instance *instance,
 420                 u32 ld, u64 row, u64 *span_blk, struct MR_DRV_RAID_MAP_ALL *map)
 421 {
 422         struct fusion_context *fusion = instance->ctrl_context;
 423         struct MR_LD_RAID         *raid = MR_LdRaidGet(ld, map);
 424         LD_SPAN_SET *span_set;
 425         struct MR_QUAD_ELEMENT    *quad;
 426         u32    span, info;
 427         PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span;
 428
 429         for (info = 0; info < MAX_QUAD_DEPTH; info++) {
 430                 span_set = &(ldSpanInfo[ld].span_set[info]);
 431
 432                 if (span_set->span_row_data_width == 0)
 433                         break;
 434
 435                 if (row > span_set->data_row_end)
 436                         continue;
 437
 438                 for (span = 0; span < raid->spanDepth; span++)
 439                         if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
 440                                 block_span_info.noElements) >= info+1) {
 441                                 quad = &map->raidMap.ldSpanMap[ld].
 442                                         spanBlock[span].
 443                                         block_span_info.quad[info];
 444                                 if (le32_to_cpu(quad->diff) == 0)
 445                                         return SPAN_INVALID;
 446                                 if (le64_to_cpu(quad->logStart) <= row  &&
 447                                         row <= le64_to_cpu(quad->logEnd)  &&
 448                                         (mega_mod64(row - le64_to_cpu(quad->logStart),
 449                                                 le32_to_cpu(quad->diff))) == 0) {
 450                                         if (span_blk != NULL) {
 451                                                 u64  blk;
 452                                                 blk = mega_div64_32
 453                                                     ((row - le64_to_cpu(quad->logStart)),
 454                                                     le32_to_cpu(quad->diff));
 455                                                 blk = (blk + le64_to_cpu(quad->offsetInSpan))
 456                                                          << raid->stripeShift;
 457                                                 *span_blk = blk;
 458                                         }
 459                                         return span;
 460                                 }
 461                         }
 462         }
 463         return SPAN_INVALID;
 464 }
 465
 466 /*
 467 ******************************************************************************
 468 *
 469 * This routine calculates the row for given strip using spanset.
 470 *
 471 * Inputs :
 472 *    instance - HBA instance
 473 *    ld   - Logical drive number
 474 *    Strip        - Strip
 475 *    map    - LD map
 476 *
 477 * Outputs :
 478 *
 479 *    row         - row associated with strip
 480 */
 481
 482 static u64  get_row_from_strip(struct megasas_instance *instance,
 483         u32 ld, u64 strip, struct MR_DRV_RAID_MAP_ALL *map)
 484 {
 485         struct fusion_context *fusion = instance->ctrl_context;
 486         struct MR_LD_RAID       *raid = MR_LdRaidGet(ld, map);
 487         LD_SPAN_SET     *span_set;
 488         PLD_SPAN_INFO   ldSpanInfo = fusion->log_to_span;
 489         u32             info, strip_offset, span, span_offset;
 490         u64             span_set_Strip, span_set_Row, retval;
 491
 492         for (info = 0; info < MAX_QUAD_DEPTH; info++) {
 493                 span_set = &(ldSpanInfo[ld].span_set[info]);
 494
 495                 if (span_set->span_row_data_width == 0)
 496                         break;
 497                 if (strip > span_set->data_strip_end)
 498                         continue;
 499
 500                 span_set_Strip = strip - span_set->data_strip_start;
 501                 strip_offset = mega_mod64(span_set_Strip,
 502                                 span_set->span_row_data_width);
 503                 span_set_Row = mega_div64_32(span_set_Strip,
 504                                 span_set->span_row_data_width) * span_set->diff;
 505                 for (span = 0, span_offset = 0; span < raid->spanDepth; span++)
 506                         if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
 507                                 block_span_info.noElements) >= info+1) {
 508                                 if (strip_offset >=
 509                                         span_set->strip_offset[span])
 510                                         span_offset++;
 511                                 else
 512                                         break;
 513                         }
 514
 515                 retval = (span_set->data_row_start + span_set_Row +
 516                                 (span_offset - 1));
 517                 return retval;
 518         }
 519         return -1LLU;
 520 }
 521
 522
 523 /*
 524 ******************************************************************************
 525 *
 526 * This routine calculates the Start Strip for given row using spanset.
 527 *
 528 * Inputs :
 529 *    instance - HBA instance
 530 *    ld   - Logical drive number
 531 *    row        - Row number
 532 *    map    - LD map
 533 *
 534 * Outputs :
 535 *
 536 *    Strip         - Start strip associated with row
 537 */
 538
 539 static u64 get_strip_from_row(struct megasas_instance *instance,
 540                 u32 ld, u64 row, struct MR_DRV_RAID_MAP_ALL *map)
 541 {
 542         struct fusion_context *fusion = instance->ctrl_context;
 543         struct MR_LD_RAID         *raid = MR_LdRaidGet(ld, map);
 544         LD_SPAN_SET *span_set;
 545         struct MR_QUAD_ELEMENT    *quad;
 546         PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span;
 547         u32    span, info;
 548         u64  strip;
 549
 550         for (info = 0; info < MAX_QUAD_DEPTH; info++) {
 551                 span_set = &(ldSpanInfo[ld].span_set[info]);
 552
 553                 if (span_set->span_row_data_width == 0)
 554                         break;
 555                 if (row > span_set->data_row_end)
 556                         continue;
 557
 558                 for (span = 0; span < raid->spanDepth; span++)
 559                         if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
 560                                 block_span_info.noElements) >= info+1) {
 561                                 quad = &map->raidMap.ldSpanMap[ld].
 562                                         spanBlock[span].block_span_info.quad[info];
 563                                 if (le64_to_cpu(quad->logStart) <= row  &&
 564                                         row <= le64_to_cpu(quad->logEnd)  &&
 565                                         mega_mod64((row - le64_to_cpu(quad->logStart)),
 566                                         le32_to_cpu(quad->diff)) == 0) {
 567                                         strip = mega_div64_32
 568                                                 (((row - span_set->data_row_start)
 569                                                         - le64_to_cpu(quad->logStart)),
 570                                                         le32_to_cpu(quad->diff));
 571                                         strip *= span_set->span_row_data_width;
 572                                         strip += span_set->data_strip_start;
 573                                         strip += span_set->strip_offset[span];
 574                                         return strip;
 575                                 }
 576                         }
 577         }
 578         dev_err(&instance->pdev->dev, "get_strip_from_row"
 579                 "returns invalid strip for ld=%x, row=%lx\n",
 580                 ld, (long unsigned int)row);
 581         return -1;
 582 }
 583
 584 /*
 585 ******************************************************************************
 586 *
 587 * This routine calculates the Physical Arm for given strip using spanset.
 588 *
 589 * Inputs :
 590 *    instance - HBA instance
 591 *    ld   - Logical drive number
 592 *    strip      - Strip
 593 *    map    - LD map
 594 *
 595 * Outputs :
 596 *
 597 *    Phys Arm         - Phys Arm associated with strip
 598 */
 599
 600 static u32 get_arm_from_strip(struct megasas_instance *instance,
 601         u32 ld, u64 strip, struct MR_DRV_RAID_MAP_ALL *map)
 602 {
 603         struct fusion_context *fusion = instance->ctrl_context;
 604         struct MR_LD_RAID         *raid = MR_LdRaidGet(ld, map);
 605         LD_SPAN_SET *span_set;
 606         PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span;
 607         u32    info, strip_offset, span, span_offset, retval;
 608
 609         for (info = 0 ; info < MAX_QUAD_DEPTH; info++) {
 610                 span_set = &(ldSpanInfo[ld].span_set[info]);
 611
 612                 if (span_set->span_row_data_width == 0)
 613                         break;
 614                 if (strip > span_set->data_strip_end)
 615                         continue;
 616
 617                 strip_offset = (uint)mega_mod64
 618                                 ((strip - span_set->data_strip_start),
 619                                 span_set->span_row_data_width);
 620
 621                 for (span = 0, span_offset = 0; span < raid->spanDepth; span++)
 622                         if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
 623                                 block_span_info.noElements) >= info+1) {
 624                                 if (strip_offset >=
 625                                         span_set->strip_offset[span])
 626                                         span_offset =
 627                                                 span_set->strip_offset[span];
 628                                 else
 629                                         break;
 630                         }
 631
 632                 retval = (strip_offset - span_offset);
 633                 return retval;
 634         }
 635
 636         dev_err(&instance->pdev->dev, "get_arm_from_strip"
 637                 "returns invalid arm for ld=%x strip=%lx\n",
 638                 ld, (long unsigned int)strip);
 639
 640         return -1;
 641 }
 642
 643 /* This Function will return Phys arm */
 644 static u8 get_arm(struct megasas_instance *instance, u32 ld, u8 span, u64 stripe,
 645                 struct MR_DRV_RAID_MAP_ALL *map)
 646 {
 647         struct MR_LD_RAID  *raid = MR_LdRaidGet(ld, map);
 648         /* Need to check correct default value */
 649         u32    arm = 0;
 650
 651         switch (raid->level) {
 652         case 0:
 653         case 5:
 654         case 6:
 655                 arm = mega_mod64(stripe, SPAN_ROW_SIZE(map, ld, span));
 656                 break;
 657         case 1:
 658                 /* start with logical arm */
 659                 arm = get_arm_from_strip(instance, ld, stripe, map);
 660                 if (arm != -1U)
 661                         arm *= 2;
 662                 break;
 663         }
 664
 665         return arm;
 666 }
 667
 668
 669 /*
 670 ******************************************************************************
 671 *
 672 * This routine calculates the arm, span and block for the specified stripe and
 673 * reference in stripe using spanset
 674 *
 675 * Inputs :
 676 *
 677 *    ld   - Logical drive number
 678 *    stripRow        - Stripe number
 679 *    stripRef    - Reference in stripe
 680 *
 681 * Outputs :
 682 *
 683 *    span          - Span number
 684 *    block         - Absolute Block number in the physical disk
 685 */
 686 static u8 mr_spanset_get_phy_params(struct megasas_instance *instance, u32 ld,
 687                 u64 stripRow, u16 stripRef, struct IO_REQUEST_INFO *io_info,
 688                 struct RAID_CONTEXT *pRAID_Context,
 689                 struct MR_DRV_RAID_MAP_ALL *map)
 690 {
 691         struct MR_LD_RAID  *raid = MR_LdRaidGet(ld, map);
 692         u32     pd, arRef, r1_alt_pd;
 693         u8      physArm, span;
 694         u64     row;
 695         u8      retval = true;
 696         u64     *pdBlock = &io_info->pdBlock;
 697         __le16  *pDevHandle = &io_info->devHandle;
 698         u8      *pPdInterface = &io_info->pd_interface;
 699         u32     logArm, rowMod, armQ, arm;
 700
 701         *pDevHandle = cpu_to_le16(MR_DEVHANDLE_INVALID);
 702
 703         /*Get row and span from io_info for Uneven Span IO.*/
 704         row         = io_info->start_row;
 705         span        = io_info->start_span;
 706
 707
 708         if (raid->level == 6) {
 709                 logArm = get_arm_from_strip(instance, ld, stripRow, map);
 710                 if (logArm == -1U)
 711                         return false;
 712                 rowMod = mega_mod64(row, SPAN_ROW_SIZE(map, ld, span));
 713                 armQ = SPAN_ROW_SIZE(map, ld, span) - 1 - rowMod;
 714                 arm = armQ + 1 + logArm;
 715                 if (arm >= SPAN_ROW_SIZE(map, ld, span))
 716                         arm -= SPAN_ROW_SIZE(map, ld, span);
 717                 physArm = (u8)arm;
 718         } else
 719                 /* Calculate the arm */
 720                 physArm = get_arm(instance, ld, span, stripRow, map);
 721         if (physArm == 0xFF)
 722                 return false;
 723
 724         arRef       = MR_LdSpanArrayGet(ld, span, map);
 725         pd          = MR_ArPdGet(arRef, physArm, map);
 726
 727         if (pd != MR_PD_INVALID) {
 728                 *pDevHandle = MR_PdDevHandleGet(pd, map);
 729                 *pPdInterface = MR_PdInterfaceTypeGet(pd, map);
 730                 /* get second pd also for raid 1/10 fast path writes*/
 731                 if ((instance->adapter_type >= VENTURA_SERIES) &&
 732                     (raid->level == 1) &&
 733                     !io_info->isRead) {
 734                         r1_alt_pd = MR_ArPdGet(arRef, physArm + 1, map);
 735                         if (r1_alt_pd != MR_PD_INVALID)
 736                                 io_info->r1_alt_dev_handle =
 737                                 MR_PdDevHandleGet(r1_alt_pd, map);
 738                 }
 739         } else {
 740                 if ((raid->level >= 5) &&
 741                         ((instance->adapter_type == THUNDERBOLT_SERIES)  ||
 742                         ((instance->adapter_type == INVADER_SERIES) &&
 743                         (raid->regTypeReqOnRead != REGION_TYPE_UNUSED))))
 744                         pRAID_Context->reg_lock_flags = REGION_TYPE_EXCLUSIVE;
 745                 else if (raid->level == 1) {
 746                         physArm = physArm + 1;
 747                         pd = MR_ArPdGet(arRef, physArm, map);
 748                         if (pd != MR_PD_INVALID) {
 749                                 *pDevHandle = MR_PdDevHandleGet(pd, map);
 750                                 *pPdInterface = MR_PdInterfaceTypeGet(pd, map);
 751                         }
 752                 }
 753         }
 754
 755         *pdBlock += stripRef + le64_to_cpu(MR_LdSpanPtrGet(ld, span, map)->startBlk);
 756         if (instance->adapter_type >= VENTURA_SERIES) {
 757                 ((struct RAID_CONTEXT_G35 *)pRAID_Context)->span_arm =
 758                         (span << RAID_CTX_SPANARM_SPAN_SHIFT) | physArm;
 759                 io_info->span_arm =
 760                         (span << RAID_CTX_SPANARM_SPAN_SHIFT) | physArm;
 761         } else {
 762                 pRAID_Context->span_arm =
 763                         (span << RAID_CTX_SPANARM_SPAN_SHIFT) | physArm;
 764                 io_info->span_arm = pRAID_Context->span_arm;
 765         }
 766         io_info->pd_after_lb = pd;
 767         return retval;
 768 }
 769
 770 /*
 771 ******************************************************************************
 772 *
 773 * This routine calculates the arm, span and block for the specified stripe and
 774 * reference in stripe.
 775 *
 776 * Inputs :
 777 *
 778 *    ld   - Logical drive number
 779 *    stripRow        - Stripe number
 780 *    stripRef    - Reference in stripe
 781 *
 782 * Outputs :
 783 *
 784 *    span          - Span number
 785 *    block         - Absolute Block number in the physical disk
 786 */
 787 static u8 MR_GetPhyParams(struct megasas_instance *instance, u32 ld, u64 stripRow,
 788                 u16 stripRef, struct IO_REQUEST_INFO *io_info,
 789                 struct RAID_CONTEXT *pRAID_Context,
 790                 struct MR_DRV_RAID_MAP_ALL *map)
 791 {
 792         struct MR_LD_RAID  *raid = MR_LdRaidGet(ld, map);
 793         u32         pd, arRef, r1_alt_pd;
 794         u8          physArm, span;
 795         u64         row;
 796         u8          retval = true;
 797         u64         *pdBlock = &io_info->pdBlock;
 798         __le16      *pDevHandle = &io_info->devHandle;
 799         u8          *pPdInterface = &io_info->pd_interface;
 800
 801         *pDevHandle = cpu_to_le16(MR_DEVHANDLE_INVALID);
 802
 803         row =  mega_div64_32(stripRow, raid->rowDataSize);
 804
 805         if (raid->level == 6) {
 806                 /* logical arm within row */
 807                 u32 logArm =  mega_mod64(stripRow, raid->rowDataSize);
 808                 u32 rowMod, armQ, arm;
 809
 810                 if (raid->rowSize == 0)
 811                         return false;
 812                 /* get logical row mod */
 813                 rowMod = mega_mod64(row, raid->rowSize);
 814                 armQ = raid->rowSize-1-rowMod; /* index of Q drive */
 815                 arm = armQ+1+logArm; /* data always logically follows Q */
 816                 if (arm >= raid->rowSize) /* handle wrap condition */
 817                         arm -= raid->rowSize;
 818                 physArm = (u8)arm;
 819         } else  {
 820                 if (raid->modFactor == 0)
 821                         return false;
 822                 physArm = MR_LdDataArmGet(ld,  mega_mod64(stripRow,
 823                                                           raid->modFactor),
 824                                           map);
 825         }
 826
 827         if (raid->spanDepth == 1) {
 828                 span = 0;
 829                 *pdBlock = row << raid->stripeShift;
 830         } else {
 831                 span = (u8)MR_GetSpanBlock(ld, row, pdBlock, map);
 832                 if (span == SPAN_INVALID)
 833                         return false;
 834         }
 835
 836         /* Get the array on which this span is present */
 837         arRef       = MR_LdSpanArrayGet(ld, span, map);
 838         pd          = MR_ArPdGet(arRef, physArm, map); /* Get the pd */
 839
 840         if (pd != MR_PD_INVALID) {
 841                 /* Get dev handle from Pd. */
 842                 *pDevHandle = MR_PdDevHandleGet(pd, map);
 843                 *pPdInterface = MR_PdInterfaceTypeGet(pd, map);
 844                 /* get second pd also for raid 1/10 fast path writes*/
 845                 if ((instance->adapter_type >= VENTURA_SERIES) &&
 846                     (raid->level == 1) &&
 847                     !io_info->isRead) {
 848                         r1_alt_pd = MR_ArPdGet(arRef, physArm + 1, map);
 849                         if (r1_alt_pd != MR_PD_INVALID)
 850                                 io_info->r1_alt_dev_handle =
 851                                         MR_PdDevHandleGet(r1_alt_pd, map);
 852                 }
 853         } else {
 854                 if ((raid->level >= 5) &&
 855                         ((instance->adapter_type == THUNDERBOLT_SERIES)  ||
 856                         ((instance->adapter_type == INVADER_SERIES) &&
 857                         (raid->regTypeReqOnRead != REGION_TYPE_UNUSED))))
 858                         pRAID_Context->reg_lock_flags = REGION_TYPE_EXCLUSIVE;
 859                 else if (raid->level == 1) {
 860                         /* Get alternate Pd. */
 861                         physArm = physArm + 1;
 862                         pd = MR_ArPdGet(arRef, physArm, map);
 863                         if (pd != MR_PD_INVALID) {
 864                                 /* Get dev handle from Pd */
 865                                 *pDevHandle = MR_PdDevHandleGet(pd, map);
 866                                 *pPdInterface = MR_PdInterfaceTypeGet(pd, map);
 867                         }
 868                 }
 869         }
 870
 871         *pdBlock += stripRef + le64_to_cpu(MR_LdSpanPtrGet(ld, span, map)->startBlk);
 872         if (instance->adapter_type >= VENTURA_SERIES) {
 873                 ((struct RAID_CONTEXT_G35 *)pRAID_Context)->span_arm =
 874                                 (span << RAID_CTX_SPANARM_SPAN_SHIFT) | physArm;
 875                 io_info->span_arm =
 876                                 (span << RAID_CTX_SPANARM_SPAN_SHIFT) | physArm;
 877         } else {
 878                 pRAID_Context->span_arm =
 879                         (span << RAID_CTX_SPANARM_SPAN_SHIFT) | physArm;
 880                 io_info->span_arm = pRAID_Context->span_arm;
 881         }
 882         io_info->pd_after_lb = pd;
 883         return retval;
 884 }
 885
 886 /*
 887  * mr_get_phy_params_r56_rmw -  Calculate parameters for R56 CTIO write operation
 888  * @instance:                   Adapter soft state
 889  * @ld:                         LD index
 890  * @stripNo:                    Strip Number
 891  * @io_info:                    IO info structure pointer
 892  * pRAID_Context:               RAID context pointer
 893  * map:                         RAID map pointer
 894  *
 895  * This routine calculates the logical arm, data Arm, row number and parity arm
 896  * for R56 CTIO write operation.
 897  */
 898 static void mr_get_phy_params_r56_rmw(struct megasas_instance *instance,
 899                             u32 ld, u64 stripNo,
 900                             struct IO_REQUEST_INFO *io_info,
 901                             struct RAID_CONTEXT_G35 *pRAID_Context,
 902                             struct MR_DRV_RAID_MAP_ALL *map)
 903 {
 904         struct MR_LD_RAID  *raid = MR_LdRaidGet(ld, map);
 905         u8          span, dataArms, arms, dataArm, logArm;
 906         s8          rightmostParityArm, PParityArm;
 907         u64         rowNum;
 908         u64 *pdBlock = &io_info->pdBlock;
 909
 910         dataArms = raid->rowDataSize;
 911         arms = raid->rowSize;
 912
 913         rowNum =  mega_div64_32(stripNo, dataArms);
 914         /* parity disk arm, first arm is 0 */
 915         rightmostParityArm = (arms - 1) - mega_mod64(rowNum, arms);
 916
 917         /* logical arm within row */
 918         logArm =  mega_mod64(stripNo, dataArms);
 919         /* physical arm for data */
 920         dataArm = mega_mod64((rightmostParityArm + 1 + logArm), arms);
 921
 922         if (raid->spanDepth == 1) {
 923                 span = 0;
 924         } else {
 925                 span = (u8)MR_GetSpanBlock(ld, rowNum, pdBlock, map);
 926                 if (span == SPAN_INVALID)
 927                         return;
 928         }
 929
 930         if (raid->level == 6) {
 931                 /* P Parity arm, note this can go negative adjust if negative */
 932                 PParityArm = (arms - 2) - mega_mod64(rowNum, arms);
 933
 934                 if (PParityArm < 0)
 935                         PParityArm += arms;
 936
 937                 /* rightmostParityArm is P-Parity for RAID 5 and Q-Parity for RAID */
 938                 pRAID_Context->flow_specific.r56_arm_map = rightmostParityArm;
 939                 pRAID_Context->flow_specific.r56_arm_map |=
 940                                     (u16)(PParityArm << RAID_CTX_R56_P_ARM_SHIFT);
 941         } else {
 942                 pRAID_Context->flow_specific.r56_arm_map |=
 943                                     (u16)(rightmostParityArm << RAID_CTX_R56_P_ARM_SHIFT);
 944         }
 945
 946         pRAID_Context->reg_lock_row_lba = cpu_to_le64(rowNum);
 947         pRAID_Context->flow_specific.r56_arm_map |=
 948                                    (u16)(logArm << RAID_CTX_R56_LOG_ARM_SHIFT);
 949         cpu_to_le16s(&pRAID_Context->flow_specific.r56_arm_map);
 950         pRAID_Context->span_arm = (span << RAID_CTX_SPANARM_SPAN_SHIFT) | dataArm;
 951         pRAID_Context->raid_flags = (MR_RAID_FLAGS_IO_SUB_TYPE_R56_DIV_OFFLOAD <<
 952                                     MR_RAID_CTX_RAID_FLAGS_IO_SUB_TYPE_SHIFT);
 953
 954         return;
 955 }
 956
 957 /*
 958 ******************************************************************************
 959 *
 960 * MR_BuildRaidContext function
 961 *
 962 * This function will initiate command processing.  The start/end row and strip
 963 * information is calculated then the lock is acquired.
 964 * This function will return 0 if region lock was acquired OR return num strips
 965 */
 966 u8
 967 MR_BuildRaidContext(struct megasas_instance *instance,
 968                     struct IO_REQUEST_INFO *io_info,
 969                     struct RAID_CONTEXT *pRAID_Context,
 970                     struct MR_DRV_RAID_MAP_ALL *map, u8 **raidLUN)
 971 {
 972         struct fusion_context *fusion;
 973         struct MR_LD_RAID  *raid;
 974         u32         stripSize, stripe_mask;
 975         u64         endLba, endStrip, endRow, start_row, start_strip;
 976         u64         regStart;
 977         u32         regSize;
 978         u8          num_strips, numRows;
 979         u16         ref_in_start_stripe, ref_in_end_stripe;
 980         u64         ldStartBlock;
 981         u32         numBlocks, ldTgtId;
 982         u8          isRead;
 983         u8          retval = 0;
 984         u8          startlba_span = SPAN_INVALID;
 985         u64 *pdBlock = &io_info->pdBlock;
 986         u16         ld;
 987
 988         ldStartBlock = io_info->ldStartBlock;
 989         numBlocks = io_info->numBlocks;
 990         ldTgtId = io_info->ldTgtId;
 991         isRead = io_info->isRead;
 992         io_info->IoforUnevenSpan = 0;
 993         io_info->start_span     = SPAN_INVALID;
 994         fusion = instance->ctrl_context;
 995
 996         ld = MR_TargetIdToLdGet(ldTgtId, map);
 997         raid = MR_LdRaidGet(ld, map);
 998         /*check read ahead bit*/
 999         io_info->ra_capable = raid->capability.ra_capable;
1000
1001         /*
1002          * if rowDataSize @RAID map and spanRowDataSize @SPAN INFO are zero
1003          * return FALSE
1004          */
1005         if (raid->rowDataSize == 0) {
1006                 if (MR_LdSpanPtrGet(ld, 0, map)->spanRowDataSize == 0)
1007                         return false;
1008                 else if (instance->UnevenSpanSupport) {
1009                         io_info->IoforUnevenSpan = 1;
1010                 } else {
1011                         dev_info(&instance->pdev->dev,
1012                                 "raid->rowDataSize is 0, but has SPAN[0]"
1013                                 "rowDataSize = 0x%0x,"
1014                                 "but there is _NO_ UnevenSpanSupport\n",
1015                                 MR_LdSpanPtrGet(ld, 0, map)->spanRowDataSize);
1016                         return false;
1017                 }
1018         }
1019
1020         stripSize = 1 << raid->stripeShift;
1021         stripe_mask = stripSize-1;
1022
1023         io_info->data_arms = raid->rowDataSize;
1024
1025         /*
1026          * calculate starting row and stripe, and number of strips and rows
1027          */
1028         start_strip         = ldStartBlock >> raid->stripeShift;
1029         ref_in_start_stripe = (u16)(ldStartBlock & stripe_mask);
1030         endLba              = ldStartBlock + numBlocks - 1;
1031         ref_in_end_stripe   = (u16)(endLba & stripe_mask);
1032         endStrip            = endLba >> raid->stripeShift;
1033         num_strips          = (u8)(endStrip - start_strip + 1); /* End strip */
1034
1035         if (io_info->IoforUnevenSpan) {
1036                 start_row = get_row_from_strip(instance, ld, start_strip, map);
1037                 endRow    = get_row_from_strip(instance, ld, endStrip, map);
1038                 if (start_row == -1ULL || endRow == -1ULL) {
1039                         dev_info(&instance->pdev->dev, "return from %s %d."
1040                                 "Send IO w/o region lock.\n",
1041                                 __func__, __LINE__);
1042                         return false;
1043                 }
1044
1045                 if (raid->spanDepth == 1) {
1046                         startlba_span = 0;
1047                         *pdBlock = start_row << raid->stripeShift;
1048                 } else
1049                         startlba_span = (u8)mr_spanset_get_span_block(instance,
1050                                                 ld, start_row, pdBlock, map);
1051                 if (startlba_span == SPAN_INVALID) {
1052                         dev_info(&instance->pdev->dev, "return from %s %d"
1053                                 "for row 0x%llx,start strip %llx"
1054                                 "endSrip %llx\n", __func__, __LINE__,
1055                                 (unsigned long long)start_row,
1056                                 (unsigned long long)start_strip,
1057                                 (unsigned long long)endStrip);
1058                         return false;
1059                 }
1060                 io_info->start_span     = startlba_span;
1061                 io_info->start_row      = start_row;
1062         } else {
1063                 start_row = mega_div64_32(start_strip, raid->rowDataSize);
1064                 endRow    = mega_div64_32(endStrip, raid->rowDataSize);
1065         }
1066         numRows = (u8)(endRow - start_row + 1);
1067
1068         /*
1069          * calculate region info.
1070          */
1071
1072         /* assume region is at the start of the first row */
1073         regStart            = start_row << raid->stripeShift;
1074         /* assume this IO needs the full row - we'll adjust if not true */
1075         regSize             = stripSize;
1076
1077         io_info->do_fp_rlbypass = raid->capability.fpBypassRegionLock;
1078
1079         /* Check if we can send this I/O via FastPath */
1080         if (raid->capability.fpCapable) {
1081                 if (isRead)
1082                         io_info->fpOkForIo = (raid->capability.fpReadCapable &&
1083                                               ((num_strips == 1) ||
1084                                                raid->capability.
1085                                                fpReadAcrossStripe));
1086                 else
1087                         io_info->fpOkForIo = (raid->capability.fpWriteCapable &&
1088                                               ((num_strips == 1) ||
1089                                                raid->capability.
1090                                                fpWriteAcrossStripe));
1091         } else
1092                 io_info->fpOkForIo = false;
1093
1094         if (numRows == 1) {
1095                 /* single-strip IOs can always lock only the data needed */
1096                 if (num_strips == 1) {
1097                         regStart += ref_in_start_stripe;
1098                         regSize = numBlocks;
1099                 }
1100                 /* multi-strip IOs always need to full stripe locked */
1101         } else if (io_info->IoforUnevenSpan == 0) {
1102                 /*
1103                  * For Even span region lock optimization.
1104                  * If the start strip is the last in the start row
1105                  */
1106                 if (start_strip == (start_row + 1) * raid->rowDataSize - 1) {
1107                         regStart += ref_in_start_stripe;
1108                         /* initialize count to sectors from startref to end
1109                            of strip */
1110                         regSize = stripSize - ref_in_start_stripe;
1111                 }
1112
1113                 /* add complete rows in the middle of the transfer */
1114                 if (numRows > 2)
1115                         regSize += (numRows-2) << raid->stripeShift;
1116
1117                 /* if IO ends within first strip of last row*/
1118                 if (endStrip == endRow*raid->rowDataSize)
1119                         regSize += ref_in_end_stripe+1;
1120                 else
1121                         regSize += stripSize;
1122         } else {
1123                 /*
1124                  * For Uneven span region lock optimization.
1125                  * If the start strip is the last in the start row
1126                  */
1127                 if (start_strip == (get_strip_from_row(instance, ld, start_row, map) +
1128                                 SPAN_ROW_DATA_SIZE(map, ld, startlba_span) - 1)) {
1129                         regStart += ref_in_start_stripe;
1130                         /* initialize count to sectors from
1131                          * startRef to end of strip
1132                          */
1133                         regSize = stripSize - ref_in_start_stripe;
1134                 }
1135                 /* Add complete rows in the middle of the transfer*/
1136
1137                 if (numRows > 2)
1138                         /* Add complete rows in the middle of the transfer*/
1139                         regSize += (numRows-2) << raid->stripeShift;
1140
1141                 /* if IO ends within first strip of last row */
1142                 if (endStrip == get_strip_from_row(instance, ld, endRow, map))
1143                         regSize += ref_in_end_stripe + 1;
1144                 else
1145                         regSize += stripSize;
1146         }
1147
1148         pRAID_Context->timeout_value =
1149                 cpu_to_le16(raid->fpIoTimeoutForLd ?
1150                             raid->fpIoTimeoutForLd :
1151                             map->raidMap.fpPdIoTimeoutSec);
1152         if (instance->adapter_type == INVADER_SERIES)
1153                 pRAID_Context->reg_lock_flags = (isRead) ?
1154                         raid->regTypeReqOnRead : raid->regTypeReqOnWrite;
1155         else if (instance->adapter_type == THUNDERBOLT_SERIES)
1156                 pRAID_Context->reg_lock_flags = (isRead) ?
1157                         REGION_TYPE_SHARED_READ : raid->regTypeReqOnWrite;
1158         pRAID_Context->virtual_disk_tgt_id = raid->targetId;
1159         pRAID_Context->reg_lock_row_lba    = cpu_to_le64(regStart);
1160         pRAID_Context->reg_lock_length    = cpu_to_le32(regSize);
1161         pRAID_Context->config_seq_num   = raid->seqNum;
1162         /* save pointer to raid->LUN array */
1163         *raidLUN = raid->LUN;
1164
1165         /* Aero R5/6 Division Offload for WRITE */
1166         if (fusion->r56_div_offload && (raid->level >= 5) && !isRead) {
1167                 mr_get_phy_params_r56_rmw(instance, ld, start_strip, io_info,
1168                                        (struct RAID_CONTEXT_G35 *)pRAID_Context,
1169                                        map);
1170                 return true;
1171         }
1172
1173         /*Get Phy Params only if FP capable, or else leave it to MR firmware
1174           to do the calculation.*/
1175         if (io_info->fpOkForIo) {
1176                 retval = io_info->IoforUnevenSpan ?
1177                                 mr_spanset_get_phy_params(instance, ld,
1178                                         start_strip, ref_in_start_stripe,
1179                                         io_info, pRAID_Context, map) :
1180                                 MR_GetPhyParams(instance, ld, start_strip,
1181                                         ref_in_start_stripe, io_info,
1182                                         pRAID_Context, map);
1183                 /* If IO on an invalid Pd, then FP is not possible.*/
1184                 if (io_info->devHandle == MR_DEVHANDLE_INVALID)
1185                         io_info->fpOkForIo = false;
1186                 return retval;
1187         } else if (isRead) {
1188                 uint stripIdx;
1189                 for (stripIdx = 0; stripIdx < num_strips; stripIdx++) {
1190                         retval = io_info->IoforUnevenSpan ?
1191                                 mr_spanset_get_phy_params(instance, ld,
1192                                     start_strip + stripIdx,
1193                                     ref_in_start_stripe, io_info,
1194                                     pRAID_Context, map) :
1195                                 MR_GetPhyParams(instance, ld,
1196                                     start_strip + stripIdx, ref_in_start_stripe,
1197                                     io_info, pRAID_Context, map);
1198                         if (!retval)
1199                                 return true;
1200                 }
1201         }
1202         return true;
1203 }
1204
1205 /*
1206 ******************************************************************************
1207 *
1208 * This routine pepare spanset info from Valid Raid map and store it into
1209 * local copy of ldSpanInfo per instance data structure.
1210 *
1211 * Inputs :
1212 * map    - LD map
1213 * ldSpanInfo - ldSpanInfo per HBA instance
1214 *
1215 */
1216 void mr_update_span_set(struct MR_DRV_RAID_MAP_ALL *map,
1217         PLD_SPAN_INFO ldSpanInfo)
1218 {
1219         u8   span, count;
1220         u32  element, span_row_width;
1221         u64  span_row;
1222         struct MR_LD_RAID *raid;
1223         LD_SPAN_SET *span_set, *span_set_prev;
1224         struct MR_QUAD_ELEMENT    *quad;
1225         int ldCount;
1226         u16 ld;
1227
1228
1229         for (ldCount = 0; ldCount < MAX_LOGICAL_DRIVES_EXT; ldCount++) {
1230                 ld = MR_TargetIdToLdGet(ldCount, map);
1231                 if (ld >= (MAX_LOGICAL_DRIVES_EXT - 1))
1232                         continue;
1233                 raid = MR_LdRaidGet(ld, map);
1234                 for (element = 0; element < MAX_QUAD_DEPTH; element++) {
1235                         for (span = 0; span < raid->spanDepth; span++) {
1236                                 if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
1237                                         block_span_info.noElements) <
1238                                         element + 1)
1239                                         continue;
1240                                 span_set = &(ldSpanInfo[ld].span_set[element]);
1241                                 quad = &map->raidMap.ldSpanMap[ld].
1242                                         spanBlock[span].block_span_info.
1243                                         quad[element];
1244
1245                                 span_set->diff = le32_to_cpu(quad->diff);
1246
1247                                 for (count = 0, span_row_width = 0;
1248                                         count < raid->spanDepth; count++) {
1249                                         if (le32_to_cpu(map->raidMap.ldSpanMap[ld].
1250                                                 spanBlock[count].
1251                                                 block_span_info.
1252                                                 noElements) >= element + 1) {
1253                                                 span_set->strip_offset[count] =
1254                                                         span_row_width;
1255                                                 span_row_width +=
1256                                                         MR_LdSpanPtrGet
1257                                                         (ld, count, map)->spanRowDataSize;
1258                                         }
1259                                 }
1260
1261                                 span_set->span_row_data_width = span_row_width;
1262                                 span_row = mega_div64_32(((le64_to_cpu(quad->logEnd) -
1263                                         le64_to_cpu(quad->logStart)) + le32_to_cpu(quad->diff)),
1264                                         le32_to_cpu(quad->diff));
1265
1266                                 if (element == 0) {
1267                                         span_set->log_start_lba = 0;
1268                                         span_set->log_end_lba =
1269                                                 ((span_row << raid->stripeShift)
1270                                                 * span_row_width) - 1;
1271
1272                                         span_set->span_row_start = 0;
1273                                         span_set->span_row_end = span_row - 1;
1274
1275                                         span_set->data_strip_start = 0;
1276                                         span_set->data_strip_end =
1277                                                 (span_row * span_row_width) - 1;
1278
1279                                         span_set->data_row_start = 0;
1280                                         span_set->data_row_end =
1281                                                 (span_row * le32_to_cpu(quad->diff)) - 1;
1282                                 } else {
1283                                         span_set_prev = &(ldSpanInfo[ld].
1284                                                         span_set[element - 1]);
1285                                         span_set->log_start_lba =
1286                                                 span_set_prev->log_end_lba + 1;
1287                                         span_set->log_end_lba =
1288                                                 span_set->log_start_lba +
1289                                                 ((span_row << raid->stripeShift)
1290                                                 * span_row_width) - 1;
1291
1292                                         span_set->span_row_start =
1293                                                 span_set_prev->span_row_end + 1;
1294                                         span_set->span_row_end =
1295                                         span_set->span_row_start + span_row - 1;
1296
1297                                         span_set->data_strip_start =
1298                                         span_set_prev->data_strip_end + 1;
1299                                         span_set->data_strip_end =
1300                                                 span_set->data_strip_start +
1301                                                 (span_row * span_row_width) - 1;
1302
1303                                         span_set->data_row_start =
1304                                                 span_set_prev->data_row_end + 1;
1305                                         span_set->data_row_end =
1306                                                 span_set->data_row_start +
1307                                                 (span_row * le32_to_cpu(quad->diff)) - 1;
1308                                 }
1309                                 break;
1310                 }
1311                 if (span == raid->spanDepth)
1312                         break;
1313             }
1314         }
1315 }
1316
1317 void mr_update_load_balance_params(struct MR_DRV_RAID_MAP_ALL *drv_map,
1318         struct LD_LOAD_BALANCE_INFO *lbInfo)
1319 {
1320         int ldCount;
1321         u16 ld;
1322         struct MR_LD_RAID *raid;
1323
1324         if (lb_pending_cmds > 128 || lb_pending_cmds < 1)
1325                 lb_pending_cmds = LB_PENDING_CMDS_DEFAULT;
1326
1327         for (ldCount = 0; ldCount < MAX_LOGICAL_DRIVES_EXT; ldCount++) {
1328                 ld = MR_TargetIdToLdGet(ldCount, drv_map);
1329                 if (ld >= MAX_LOGICAL_DRIVES_EXT - 1) {
1330                         lbInfo[ldCount].loadBalanceFlag = 0;
1331                         continue;
1332                 }
1333
1334                 raid = MR_LdRaidGet(ld, drv_map);
1335                 if ((raid->level != 1) ||
1336                         (raid->ldState != MR_LD_STATE_OPTIMAL)) {
1337                         lbInfo[ldCount].loadBalanceFlag = 0;
1338                         continue;
1339                 }
1340                 lbInfo[ldCount].loadBalanceFlag = 1;
1341         }
1342 }
1343
1344 static u8 megasas_get_best_arm_pd(struct megasas_instance *instance,
1345                            struct LD_LOAD_BALANCE_INFO *lbInfo,
1346                            struct IO_REQUEST_INFO *io_info,
1347                            struct MR_DRV_RAID_MAP_ALL *drv_map)
1348 {
1349         struct MR_LD_RAID  *raid;
1350         u16     pd1_dev_handle;
1351         u16     pend0, pend1, ld;
1352         u64     diff0, diff1;
1353         u8      bestArm, pd0, pd1, span, arm;
1354         u32     arRef, span_row_size;
1355
1356         u64 block = io_info->ldStartBlock;
1357         u32 count = io_info->numBlocks;
1358
1359         span = ((io_info->span_arm & RAID_CTX_SPANARM_SPAN_MASK)
1360                         >> RAID_CTX_SPANARM_SPAN_SHIFT);
1361         arm = (io_info->span_arm & RAID_CTX_SPANARM_ARM_MASK);
1362
1363         ld = MR_TargetIdToLdGet(io_info->ldTgtId, drv_map);
1364         raid = MR_LdRaidGet(ld, drv_map);
1365         span_row_size = instance->UnevenSpanSupport ?
1366                         SPAN_ROW_SIZE(drv_map, ld, span) : raid->rowSize;
1367
1368         arRef = MR_LdSpanArrayGet(ld, span, drv_map);
1369         pd0 = MR_ArPdGet(arRef, arm, drv_map);
1370         pd1 = MR_ArPdGet(arRef, (arm + 1) >= span_row_size ?
1371                 (arm + 1 - span_row_size) : arm + 1, drv_map);
1372
1373         /* Get PD1 Dev Handle */
1374
1375         pd1_dev_handle = MR_PdDevHandleGet(pd1, drv_map);
1376
1377         if (pd1_dev_handle == MR_DEVHANDLE_INVALID) {
1378                 bestArm = arm;
1379         } else {
1380                 /* get the pending cmds for the data and mirror arms */
1381                 pend0 = atomic_read(&lbInfo->scsi_pending_cmds[pd0]);
1382                 pend1 = atomic_read(&lbInfo->scsi_pending_cmds[pd1]);
1383
1384                 /* Determine the disk whose head is nearer to the req. block */
1385                 diff0 = ABS_DIFF(block, lbInfo->last_accessed_block[pd0]);
1386                 diff1 = ABS_DIFF(block, lbInfo->last_accessed_block[pd1]);
1387                 bestArm = (diff0 <= diff1 ? arm : arm ^ 1);
1388
1389                 /* Make balance count from 16 to 4 to
1390                  *  keep driver in sync with Firmware
1391                  */
1392                 if ((bestArm == arm && pend0 > pend1 + lb_pending_cmds)  ||
1393                     (bestArm != arm && pend1 > pend0 + lb_pending_cmds))
1394                         bestArm ^= 1;
1395
1396                 /* Update the last accessed block on the correct pd */
1397                 io_info->span_arm =
1398                         (span << RAID_CTX_SPANARM_SPAN_SHIFT) | bestArm;
1399                 io_info->pd_after_lb = (bestArm == arm) ? pd0 : pd1;
1400         }
1401
1402         lbInfo->last_accessed_block[io_info->pd_after_lb] = block + count - 1;
1403         return io_info->pd_after_lb;
1404 }
1405
1406 __le16 get_updated_dev_handle(struct megasas_instance *instance,
1407                               struct LD_LOAD_BALANCE_INFO *lbInfo,
1408                               struct IO_REQUEST_INFO *io_info,
1409                               struct MR_DRV_RAID_MAP_ALL *drv_map)
1410 {
1411         u8 arm_pd;
1412         __le16 devHandle;
1413
1414         /* get best new arm (PD ID) */
1415         arm_pd  = megasas_get_best_arm_pd(instance, lbInfo, io_info, drv_map);
1416         devHandle = MR_PdDevHandleGet(arm_pd, drv_map);
1417         io_info->pd_interface = MR_PdInterfaceTypeGet(arm_pd, drv_map);
1418         atomic_inc(&lbInfo->scsi_pending_cmds[arm_pd]);
1419
1420         return devHandle;
1421 }