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  * @param dividend    : Dividend
  84  * @param divisor    : Divisor
  85  *
  86  * @return quotient
  87  **/
  88 u64 mega_div64_32(uint64_t dividend, uint32_t divisor)
  89 {
  90         u32 remainder;
  91         u64 d;
  92
  93         if (!divisor)
  94                 printk(KERN_ERR "megasas : DIVISOR is zero in mod fn\n");
  95
  96         d = dividend;
  97         remainder = do_div(d, divisor);
  98
  99         return d;
 100 }
 101
 102 struct MR_LD_RAID *MR_LdRaidGet(u32 ld, struct MR_DRV_RAID_MAP_ALL *map)
 103 {
 104         return &map->raidMap.ldSpanMap[ld].ldRaid;
 105 }
 106
 107 static struct MR_SPAN_BLOCK_INFO *MR_LdSpanInfoGet(u32 ld,
 108                                                    struct MR_DRV_RAID_MAP_ALL
 109                                                    *map)
 110 {
 111         return &map->raidMap.ldSpanMap[ld].spanBlock[0];
 112 }
 113
 114 static u8 MR_LdDataArmGet(u32 ld, u32 armIdx, struct MR_DRV_RAID_MAP_ALL *map)
 115 {
 116         return map->raidMap.ldSpanMap[ld].dataArmMap[armIdx];
 117 }
 118
 119 u16 MR_ArPdGet(u32 ar, u32 arm, struct MR_DRV_RAID_MAP_ALL *map)
 120 {
 121         return le16_to_cpu(map->raidMap.arMapInfo[ar].pd[arm]);
 122 }
 123
 124 u16 MR_LdSpanArrayGet(u32 ld, u32 span, struct MR_DRV_RAID_MAP_ALL *map)
 125 {
 126         return le16_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].span.arrayRef);
 127 }
 128
 129 __le16 MR_PdDevHandleGet(u32 pd, struct MR_DRV_RAID_MAP_ALL *map)
 130 {
 131         return map->raidMap.devHndlInfo[pd].curDevHdl;
 132 }
 133
 134 static u8 MR_PdInterfaceTypeGet(u32 pd, struct MR_DRV_RAID_MAP_ALL *map)
 135 {
 136         return map->raidMap.devHndlInfo[pd].interfaceType;
 137 }
 138
 139 u16 MR_GetLDTgtId(u32 ld, struct MR_DRV_RAID_MAP_ALL *map)
 140 {
 141         return le16_to_cpu(map->raidMap.ldSpanMap[ld].ldRaid.targetId);
 142 }
 143
 144 u16 MR_TargetIdToLdGet(u32 ldTgtId, struct MR_DRV_RAID_MAP_ALL *map)
 145 {
 146         return map->raidMap.ldTgtIdToLd[ldTgtId];
 147 }
 148
 149 static struct MR_LD_SPAN *MR_LdSpanPtrGet(u32 ld, u32 span,
 150                                           struct MR_DRV_RAID_MAP_ALL *map)
 151 {
 152         return &map->raidMap.ldSpanMap[ld].spanBlock[span].span;
 153 }
 154
 155 /*
 156  * This function will Populate Driver Map using firmware raid map
 157  */
 158 static int MR_PopulateDrvRaidMap(struct megasas_instance *instance, u64 map_id)
 159 {
 160         struct fusion_context *fusion = instance->ctrl_context;
 161         struct MR_FW_RAID_MAP_ALL     *fw_map_old    = NULL;
 162         struct MR_FW_RAID_MAP         *pFwRaidMap    = NULL;
 163         int i, j;
 164         u16 ld_count;
 165         struct MR_FW_RAID_MAP_DYNAMIC *fw_map_dyn;
 166         struct MR_FW_RAID_MAP_EXT *fw_map_ext;
 167         struct MR_RAID_MAP_DESC_TABLE *desc_table;
 168
 169
 170         struct MR_DRV_RAID_MAP_ALL *drv_map =
 171                         fusion->ld_drv_map[(map_id & 1)];
 172         struct MR_DRV_RAID_MAP *pDrvRaidMap = &drv_map->raidMap;
 173         void *raid_map_data = NULL;
 174
 175         memset(drv_map, 0, fusion->drv_map_sz);
 176         memset(pDrvRaidMap->ldTgtIdToLd,
 177                0xff, (sizeof(u16) * MAX_LOGICAL_DRIVES_DYN));
 178
 179         if (instance->max_raid_mapsize) {
 180                 fw_map_dyn = fusion->ld_map[(map_id & 1)];
 181                 desc_table =
 182                 (struct MR_RAID_MAP_DESC_TABLE *)((void *)fw_map_dyn + le32_to_cpu(fw_map_dyn->desc_table_offset));
 183                 if (desc_table != fw_map_dyn->raid_map_desc_table)
 184                         dev_dbg(&instance->pdev->dev, "offsets of desc table are not matching desc %p original %p\n",
 185                                 desc_table, fw_map_dyn->raid_map_desc_table);
 186
 187                 ld_count = (u16)le16_to_cpu(fw_map_dyn->ld_count);
 188                 pDrvRaidMap->ldCount = (__le16)cpu_to_le16(ld_count);
 189                 pDrvRaidMap->fpPdIoTimeoutSec =
 190                         fw_map_dyn->fp_pd_io_timeout_sec;
 191                 pDrvRaidMap->totalSize =
 192                         cpu_to_le32(sizeof(struct MR_DRV_RAID_MAP_ALL));
 193                 /* point to actual data starting point*/
 194                 raid_map_data = (void *)fw_map_dyn +
 195                         le32_to_cpu(fw_map_dyn->desc_table_offset) +
 196                         le32_to_cpu(fw_map_dyn->desc_table_size);
 197
 198                 for (i = 0; i < le32_to_cpu(fw_map_dyn->desc_table_num_elements); ++i) {
 199                         switch (le32_to_cpu(desc_table->raid_map_desc_type)) {
 200                         case RAID_MAP_DESC_TYPE_DEVHDL_INFO:
 201                                 fw_map_dyn->dev_hndl_info =
 202                                 (struct MR_DEV_HANDLE_INFO *)(raid_map_data + le32_to_cpu(desc_table->raid_map_desc_offset));
 203                                 memcpy(pDrvRaidMap->devHndlInfo,
 204                                         fw_map_dyn->dev_hndl_info,
 205                                         sizeof(struct MR_DEV_HANDLE_INFO) *
 206                                         le32_to_cpu(desc_table->raid_map_desc_elements));
 207                         break;
 208                         case RAID_MAP_DESC_TYPE_TGTID_INFO:
 209                                 fw_map_dyn->ld_tgt_id_to_ld =
 210                                         (u16 *)(raid_map_data +
 211                                         le32_to_cpu(desc_table->raid_map_desc_offset));
 212                                 for (j = 0; j < le32_to_cpu(desc_table->raid_map_desc_elements); j++) {
 213                                         pDrvRaidMap->ldTgtIdToLd[j] =
 214                                                 le16_to_cpu(fw_map_dyn->ld_tgt_id_to_ld[j]);
 215                                 }
 216                         break;
 217                         case RAID_MAP_DESC_TYPE_ARRAY_INFO:
 218                                 fw_map_dyn->ar_map_info =
 219                                         (struct MR_ARRAY_INFO *)
 220                                         (raid_map_data + le32_to_cpu(desc_table->raid_map_desc_offset));
 221                                 memcpy(pDrvRaidMap->arMapInfo,
 222                                        fw_map_dyn->ar_map_info,
 223                                        sizeof(struct MR_ARRAY_INFO) *
 224                                        le32_to_cpu(desc_table->raid_map_desc_elements));
 225                         break;
 226                         case RAID_MAP_DESC_TYPE_SPAN_INFO:
 227                                 fw_map_dyn->ld_span_map =
 228                                         (struct MR_LD_SPAN_MAP *)
 229                                         (raid_map_data +
 230                                         le32_to_cpu(desc_table->raid_map_desc_offset));
 231                                 memcpy(pDrvRaidMap->ldSpanMap,
 232                                        fw_map_dyn->ld_span_map,
 233                                        sizeof(struct MR_LD_SPAN_MAP) *
 234                                        le32_to_cpu(desc_table->raid_map_desc_elements));
 235                         break;
 236                         default:
 237                                 dev_dbg(&instance->pdev->dev, "wrong number of desctableElements %d\n",
 238                                         fw_map_dyn->desc_table_num_elements);
 239                         }
 240                         ++desc_table;
 241                 }
 242
 243         } else if (instance->supportmax256vd) {
 244                 fw_map_ext =
 245                         (struct MR_FW_RAID_MAP_EXT *)fusion->ld_map[(map_id & 1)];
 246                 ld_count = (u16)le16_to_cpu(fw_map_ext->ldCount);
 247                 if (ld_count > MAX_LOGICAL_DRIVES_EXT) {
 248                         dev_dbg(&instance->pdev->dev, "megaraid_sas: LD count exposed in RAID map in not valid\n");
 249                         return 1;
 250                 }
 251
 252                 pDrvRaidMap->ldCount = (__le16)cpu_to_le16(ld_count);
 253                 pDrvRaidMap->fpPdIoTimeoutSec = fw_map_ext->fpPdIoTimeoutSec;
 254                 for (i = 0; i < (MAX_LOGICAL_DRIVES_EXT); i++)
 255                         pDrvRaidMap->ldTgtIdToLd[i] =
 256                                 (u16)fw_map_ext->ldTgtIdToLd[i];
 257                 memcpy(pDrvRaidMap->ldSpanMap, fw_map_ext->ldSpanMap,
 258                        sizeof(struct MR_LD_SPAN_MAP) * ld_count);
 259                 memcpy(pDrvRaidMap->arMapInfo, fw_map_ext->arMapInfo,
 260                        sizeof(struct MR_ARRAY_INFO) * MAX_API_ARRAYS_EXT);
 261                 memcpy(pDrvRaidMap->devHndlInfo, fw_map_ext->devHndlInfo,
 262                        sizeof(struct MR_DEV_HANDLE_INFO) *
 263                        MAX_RAIDMAP_PHYSICAL_DEVICES);
 264
 265                 /* New Raid map will not set totalSize, so keep expected value
 266                  * for legacy code in ValidateMapInfo
 267                  */
 268                 pDrvRaidMap->totalSize =
 269                         cpu_to_le32(sizeof(struct MR_FW_RAID_MAP_EXT));
 270         } else {
 271                 fw_map_old = (struct MR_FW_RAID_MAP_ALL *)
 272                                 fusion->ld_map[(map_id & 1)];
 273                 pFwRaidMap = &fw_map_old->raidMap;
 274                 ld_count = (u16)le32_to_cpu(pFwRaidMap->ldCount);
 275                 if (ld_count > MAX_LOGICAL_DRIVES) {
 276                         dev_dbg(&instance->pdev->dev,
 277                                 "LD count exposed in RAID map in not valid\n");
 278                         return 1;
 279                 }
 280
 281                 pDrvRaidMap->totalSize = pFwRaidMap->totalSize;
 282                 pDrvRaidMap->ldCount = (__le16)cpu_to_le16(ld_count);
 283                 pDrvRaidMap->fpPdIoTimeoutSec = pFwRaidMap->fpPdIoTimeoutSec;
 284                 for (i = 0; i < MAX_RAIDMAP_LOGICAL_DRIVES + MAX_RAIDMAP_VIEWS; i++)
 285                         pDrvRaidMap->ldTgtIdToLd[i] =
 286                                 (u8)pFwRaidMap->ldTgtIdToLd[i];
 287                 for (i = 0; i < ld_count; i++) {
 288                         pDrvRaidMap->ldSpanMap[i] = pFwRaidMap->ldSpanMap[i];
 289                 }
 290                 memcpy(pDrvRaidMap->arMapInfo, pFwRaidMap->arMapInfo,
 291                         sizeof(struct MR_ARRAY_INFO) * MAX_RAIDMAP_ARRAYS);
 292                 memcpy(pDrvRaidMap->devHndlInfo, pFwRaidMap->devHndlInfo,
 293                         sizeof(struct MR_DEV_HANDLE_INFO) *
 294                         MAX_RAIDMAP_PHYSICAL_DEVICES);
 295         }
 296
 297         return 0;
 298 }
 299
 300 /*
 301  * This function will validate Map info data provided by FW
 302  */
 303 u8 MR_ValidateMapInfo(struct megasas_instance *instance, u64 map_id)
 304 {
 305         struct fusion_context *fusion;
 306         struct MR_DRV_RAID_MAP_ALL *drv_map;
 307         struct MR_DRV_RAID_MAP *pDrvRaidMap;
 308         struct LD_LOAD_BALANCE_INFO *lbInfo;
 309         PLD_SPAN_INFO ldSpanInfo;
 310         struct MR_LD_RAID         *raid;
 311         u16 num_lds, i;
 312         u16 ld;
 313         u32 expected_size;
 314
 315         if (MR_PopulateDrvRaidMap(instance, map_id))
 316                 return 0;
 317
 318         fusion = instance->ctrl_context;
 319         drv_map = fusion->ld_drv_map[(map_id & 1)];
 320         pDrvRaidMap = &drv_map->raidMap;
 321
 322         lbInfo = fusion->load_balance_info;
 323         ldSpanInfo = fusion->log_to_span;
 324
 325         if (instance->max_raid_mapsize)
 326                 expected_size = sizeof(struct MR_DRV_RAID_MAP_ALL);
 327         else if (instance->supportmax256vd)
 328                 expected_size = sizeof(struct MR_FW_RAID_MAP_EXT);
 329         else
 330                 expected_size =
 331                         (sizeof(struct MR_FW_RAID_MAP) - sizeof(struct MR_LD_SPAN_MAP) +
 332                         (sizeof(struct MR_LD_SPAN_MAP) * le16_to_cpu(pDrvRaidMap->ldCount)));
 333
 334         if (le32_to_cpu(pDrvRaidMap->totalSize) != expected_size) {
 335                 dev_dbg(&instance->pdev->dev, "megasas: map info structure size 0x%x",
 336                         le32_to_cpu(pDrvRaidMap->totalSize));
 337                 dev_dbg(&instance->pdev->dev, "is not matching expected size 0x%x\n",
 338                         (unsigned int)expected_size);
 339                 dev_err(&instance->pdev->dev, "megasas: span map %x, pDrvRaidMap->totalSize : %x\n",
 340                         (unsigned int)sizeof(struct MR_LD_SPAN_MAP),
 341                         le32_to_cpu(pDrvRaidMap->totalSize));
 342                 return 0;
 343         }
 344
 345         if (instance->UnevenSpanSupport)
 346                 mr_update_span_set(drv_map, ldSpanInfo);
 347
 348         if (lbInfo)
 349                 mr_update_load_balance_params(drv_map, lbInfo);
 350
 351         num_lds = le16_to_cpu(drv_map->raidMap.ldCount);
 352
 353         memcpy(instance->ld_ids_prev,
 354                instance->ld_ids_from_raidmap,
 355                sizeof(instance->ld_ids_from_raidmap));
 356         memset(instance->ld_ids_from_raidmap, 0xff, MEGASAS_MAX_LD_IDS);
 357         /*Convert Raid capability values to CPU arch */
 358         for (i = 0; (num_lds > 0) && (i < MAX_LOGICAL_DRIVES_EXT); i++) {
 359                 ld = MR_TargetIdToLdGet(i, drv_map);
 360
 361                 /* For non existing VDs, iterate to next VD*/
 362                 if (ld >= (MAX_LOGICAL_DRIVES_EXT - 1))
 363                         continue;
 364
 365                 raid = MR_LdRaidGet(ld, drv_map);
 366                 le32_to_cpus((u32 *)&raid->capability);
 367                 instance->ld_ids_from_raidmap[i] = i;
 368                 num_lds--;
 369         }
 370
 371         return 1;
 372 }
 373
 374 u32 MR_GetSpanBlock(u32 ld, u64 row, u64 *span_blk,
 375                     struct MR_DRV_RAID_MAP_ALL *map)
 376 {
 377         struct MR_SPAN_BLOCK_INFO *pSpanBlock = MR_LdSpanInfoGet(ld, map);
 378         struct MR_QUAD_ELEMENT    *quad;
 379         struct MR_LD_RAID         *raid = MR_LdRaidGet(ld, map);
 380         u32                span, j;
 381
 382         for (span = 0; span < raid->spanDepth; span++, pSpanBlock++) {
 383
 384                 for (j = 0; j < le32_to_cpu(pSpanBlock->block_span_info.noElements); j++) {
 385                         quad = &pSpanBlock->block_span_info.quad[j];
 386
 387                         if (le32_to_cpu(quad->diff) == 0)
 388                                 return SPAN_INVALID;
 389                         if (le64_to_cpu(quad->logStart) <= row && row <=
 390                                 le64_to_cpu(quad->logEnd) && (mega_mod64(row - le64_to_cpu(quad->logStart),
 391                                 le32_to_cpu(quad->diff))) == 0) {
 392                                 if (span_blk != NULL) {
 393                                         u64  blk, debugBlk;
 394                                         blk =  mega_div64_32((row-le64_to_cpu(quad->logStart)), le32_to_cpu(quad->diff));
 395                                         debugBlk = blk;
 396
 397                                         blk = (blk + le64_to_cpu(quad->offsetInSpan)) << raid->stripeShift;
 398                                         *span_blk = blk;
 399                                 }
 400                                 return span;
 401                         }
 402                 }
 403         }
 404         return SPAN_INVALID;
 405 }
 406
 407 /*
 408 ******************************************************************************
 409 *
 410 * This routine calculates the Span block for given row using spanset.
 411 *
 412 * Inputs :
 413 *    instance - HBA instance
 414 *    ld   - Logical drive number
 415 *    row        - Row number
 416 *    map    - LD map
 417 *
 418 * Outputs :
 419 *
 420 *    span          - Span number
 421 *    block         - Absolute Block number in the physical disk
 422 *    div_error     - Devide error code.
 423 */
 424
 425 u32 mr_spanset_get_span_block(struct megasas_instance *instance,
 426                 u32 ld, u64 row, u64 *span_blk, struct MR_DRV_RAID_MAP_ALL *map)
 427 {
 428         struct fusion_context *fusion = instance->ctrl_context;
 429         struct MR_LD_RAID         *raid = MR_LdRaidGet(ld, map);
 430         LD_SPAN_SET *span_set;
 431         struct MR_QUAD_ELEMENT    *quad;
 432         u32    span, info;
 433         PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span;
 434
 435         for (info = 0; info < MAX_QUAD_DEPTH; info++) {
 436                 span_set = &(ldSpanInfo[ld].span_set[info]);
 437
 438                 if (span_set->span_row_data_width == 0)
 439                         break;
 440
 441                 if (row > span_set->data_row_end)
 442                         continue;
 443
 444                 for (span = 0; span < raid->spanDepth; span++)
 445                         if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
 446                                 block_span_info.noElements) >= info+1) {
 447                                 quad = &map->raidMap.ldSpanMap[ld].
 448                                         spanBlock[span].
 449                                         block_span_info.quad[info];
 450                                 if (le32_to_cpu(quad->diff) == 0)
 451                                         return SPAN_INVALID;
 452                                 if (le64_to_cpu(quad->logStart) <= row  &&
 453                                         row <= le64_to_cpu(quad->logEnd)  &&
 454                                         (mega_mod64(row - le64_to_cpu(quad->logStart),
 455                                                 le32_to_cpu(quad->diff))) == 0) {
 456                                         if (span_blk != NULL) {
 457                                                 u64  blk;
 458                                                 blk = mega_div64_32
 459                                                     ((row - le64_to_cpu(quad->logStart)),
 460                                                     le32_to_cpu(quad->diff));
 461                                                 blk = (blk + le64_to_cpu(quad->offsetInSpan))
 462                                                          << raid->stripeShift;
 463                                                 *span_blk = blk;
 464                                         }
 465                                         return span;
 466                                 }
 467                         }
 468         }
 469         return SPAN_INVALID;
 470 }
 471
 472 /*
 473 ******************************************************************************
 474 *
 475 * This routine calculates the row for given strip using spanset.
 476 *
 477 * Inputs :
 478 *    instance - HBA instance
 479 *    ld   - Logical drive number
 480 *    Strip        - Strip
 481 *    map    - LD map
 482 *
 483 * Outputs :
 484 *
 485 *    row         - row associated with strip
 486 */
 487
 488 static u64  get_row_from_strip(struct megasas_instance *instance,
 489         u32 ld, u64 strip, struct MR_DRV_RAID_MAP_ALL *map)
 490 {
 491         struct fusion_context *fusion = instance->ctrl_context;
 492         struct MR_LD_RAID       *raid = MR_LdRaidGet(ld, map);
 493         LD_SPAN_SET     *span_set;
 494         PLD_SPAN_INFO   ldSpanInfo = fusion->log_to_span;
 495         u32             info, strip_offset, span, span_offset;
 496         u64             span_set_Strip, span_set_Row, retval;
 497
 498         for (info = 0; info < MAX_QUAD_DEPTH; info++) {
 499                 span_set = &(ldSpanInfo[ld].span_set[info]);
 500
 501                 if (span_set->span_row_data_width == 0)
 502                         break;
 503                 if (strip > span_set->data_strip_end)
 504                         continue;
 505
 506                 span_set_Strip = strip - span_set->data_strip_start;
 507                 strip_offset = mega_mod64(span_set_Strip,
 508                                 span_set->span_row_data_width);
 509                 span_set_Row = mega_div64_32(span_set_Strip,
 510                                 span_set->span_row_data_width) * span_set->diff;
 511                 for (span = 0, span_offset = 0; span < raid->spanDepth; span++)
 512                         if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
 513                                 block_span_info.noElements) >= info+1) {
 514                                 if (strip_offset >=
 515                                         span_set->strip_offset[span])
 516                                         span_offset++;
 517                                 else
 518                                         break;
 519                         }
 520
 521                 retval = (span_set->data_row_start + span_set_Row +
 522                                 (span_offset - 1));
 523                 return retval;
 524         }
 525         return -1LLU;
 526 }
 527
 528
 529 /*
 530 ******************************************************************************
 531 *
 532 * This routine calculates the Start Strip for given row using spanset.
 533 *
 534 * Inputs :
 535 *    instance - HBA instance
 536 *    ld   - Logical drive number
 537 *    row        - Row number
 538 *    map    - LD map
 539 *
 540 * Outputs :
 541 *
 542 *    Strip         - Start strip associated with row
 543 */
 544
 545 static u64 get_strip_from_row(struct megasas_instance *instance,
 546                 u32 ld, u64 row, struct MR_DRV_RAID_MAP_ALL *map)
 547 {
 548         struct fusion_context *fusion = instance->ctrl_context;
 549         struct MR_LD_RAID         *raid = MR_LdRaidGet(ld, map);
 550         LD_SPAN_SET *span_set;
 551         struct MR_QUAD_ELEMENT    *quad;
 552         PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span;
 553         u32    span, info;
 554         u64  strip;
 555
 556         for (info = 0; info < MAX_QUAD_DEPTH; info++) {
 557                 span_set = &(ldSpanInfo[ld].span_set[info]);
 558
 559                 if (span_set->span_row_data_width == 0)
 560                         break;
 561                 if (row > span_set->data_row_end)
 562                         continue;
 563
 564                 for (span = 0; span < raid->spanDepth; span++)
 565                         if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
 566                                 block_span_info.noElements) >= info+1) {
 567                                 quad = &map->raidMap.ldSpanMap[ld].
 568                                         spanBlock[span].block_span_info.quad[info];
 569                                 if (le64_to_cpu(quad->logStart) <= row  &&
 570                                         row <= le64_to_cpu(quad->logEnd)  &&
 571                                         mega_mod64((row - le64_to_cpu(quad->logStart)),
 572                                         le32_to_cpu(quad->diff)) == 0) {
 573                                         strip = mega_div64_32
 574                                                 (((row - span_set->data_row_start)
 575                                                         - le64_to_cpu(quad->logStart)),
 576                                                         le32_to_cpu(quad->diff));
 577                                         strip *= span_set->span_row_data_width;
 578                                         strip += span_set->data_strip_start;
 579                                         strip += span_set->strip_offset[span];
 580                                         return strip;
 581                                 }
 582                         }
 583         }
 584         dev_err(&instance->pdev->dev, "get_strip_from_row"
 585                 "returns invalid strip for ld=%x, row=%lx\n",
 586                 ld, (long unsigned int)row);
 587         return -1;
 588 }
 589
 590 /*
 591 ******************************************************************************
 592 *
 593 * This routine calculates the Physical Arm for given strip using spanset.
 594 *
 595 * Inputs :
 596 *    instance - HBA instance
 597 *    ld   - Logical drive number
 598 *    strip      - Strip
 599 *    map    - LD map
 600 *
 601 * Outputs :
 602 *
 603 *    Phys Arm         - Phys Arm associated with strip
 604 */
 605
 606 static u32 get_arm_from_strip(struct megasas_instance *instance,
 607         u32 ld, u64 strip, struct MR_DRV_RAID_MAP_ALL *map)
 608 {
 609         struct fusion_context *fusion = instance->ctrl_context;
 610         struct MR_LD_RAID         *raid = MR_LdRaidGet(ld, map);
 611         LD_SPAN_SET *span_set;
 612         PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span;
 613         u32    info, strip_offset, span, span_offset, retval;
 614
 615         for (info = 0 ; info < MAX_QUAD_DEPTH; info++) {
 616                 span_set = &(ldSpanInfo[ld].span_set[info]);
 617
 618                 if (span_set->span_row_data_width == 0)
 619                         break;
 620                 if (strip > span_set->data_strip_end)
 621                         continue;
 622
 623                 strip_offset = (uint)mega_mod64
 624                                 ((strip - span_set->data_strip_start),
 625                                 span_set->span_row_data_width);
 626
 627                 for (span = 0, span_offset = 0; span < raid->spanDepth; span++)
 628                         if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
 629                                 block_span_info.noElements) >= info+1) {
 630                                 if (strip_offset >=
 631                                         span_set->strip_offset[span])
 632                                         span_offset =
 633                                                 span_set->strip_offset[span];
 634                                 else
 635                                         break;
 636                         }
 637
 638                 retval = (strip_offset - span_offset);
 639                 return retval;
 640         }
 641
 642         dev_err(&instance->pdev->dev, "get_arm_from_strip"
 643                 "returns invalid arm for ld=%x strip=%lx\n",
 644                 ld, (long unsigned int)strip);
 645
 646         return -1;
 647 }
 648
 649 /* This Function will return Phys arm */
 650 u8 get_arm(struct megasas_instance *instance, u32 ld, u8 span, u64 stripe,
 651                 struct MR_DRV_RAID_MAP_ALL *map)
 652 {
 653         struct MR_LD_RAID  *raid = MR_LdRaidGet(ld, map);
 654         /* Need to check correct default value */
 655         u32    arm = 0;
 656
 657         switch (raid->level) {
 658         case 0:
 659         case 5:
 660         case 6:
 661                 arm = mega_mod64(stripe, SPAN_ROW_SIZE(map, ld, span));
 662                 break;
 663         case 1:
 664                 /* start with logical arm */
 665                 arm = get_arm_from_strip(instance, ld, stripe, map);
 666                 if (arm != -1U)
 667                         arm *= 2;
 668                 break;
 669         }
 670
 671         return arm;
 672 }
 673
 674
 675 /*
 676 ******************************************************************************
 677 *
 678 * This routine calculates the arm, span and block for the specified stripe and
 679 * reference in stripe using spanset
 680 *
 681 * Inputs :
 682 *
 683 *    ld   - Logical drive number
 684 *    stripRow        - Stripe number
 685 *    stripRef    - Reference in stripe
 686 *
 687 * Outputs :
 688 *
 689 *    span          - Span number
 690 *    block         - Absolute Block number in the physical disk
 691 */
 692 static u8 mr_spanset_get_phy_params(struct megasas_instance *instance, u32 ld,
 693                 u64 stripRow, u16 stripRef, struct IO_REQUEST_INFO *io_info,
 694                 struct RAID_CONTEXT *pRAID_Context,
 695                 struct MR_DRV_RAID_MAP_ALL *map)
 696 {
 697         struct MR_LD_RAID  *raid = MR_LdRaidGet(ld, map);
 698         u32     pd, arRef, r1_alt_pd;
 699         u8      physArm, span;
 700         u64     row;
 701         u8      retval = true;
 702         u64     *pdBlock = &io_info->pdBlock;
 703         __le16  *pDevHandle = &io_info->devHandle;
 704         u8      *pPdInterface = &io_info->pd_interface;
 705         u32     logArm, rowMod, armQ, arm;
 706         struct fusion_context *fusion;
 707
 708         fusion = instance->ctrl_context;
 709         *pDevHandle = cpu_to_le16(MR_DEVHANDLE_INVALID);
 710
 711         /*Get row and span from io_info for Uneven Span IO.*/
 712         row         = io_info->start_row;
 713         span        = io_info->start_span;
 714
 715
 716         if (raid->level == 6) {
 717                 logArm = get_arm_from_strip(instance, ld, stripRow, map);
 718                 if (logArm == -1U)
 719                         return false;
 720                 rowMod = mega_mod64(row, SPAN_ROW_SIZE(map, ld, span));
 721                 armQ = SPAN_ROW_SIZE(map, ld, span) - 1 - rowMod;
 722                 arm = armQ + 1 + logArm;
 723                 if (arm >= SPAN_ROW_SIZE(map, ld, span))
 724                         arm -= SPAN_ROW_SIZE(map, ld, span);
 725                 physArm = (u8)arm;
 726         } else
 727                 /* Calculate the arm */
 728                 physArm = get_arm(instance, ld, span, stripRow, map);
 729         if (physArm == 0xFF)
 730                 return false;
 731
 732         arRef       = MR_LdSpanArrayGet(ld, span, map);
 733         pd          = MR_ArPdGet(arRef, physArm, map);
 734
 735         if (pd != MR_PD_INVALID) {
 736                 *pDevHandle = MR_PdDevHandleGet(pd, map);
 737                 *pPdInterface = MR_PdInterfaceTypeGet(pd, map);
 738                 /* get second pd also for raid 1/10 fast path writes*/
 739                 if ((instance->adapter_type >= VENTURA_SERIES) &&
 740                     (raid->level == 1) &&
 741                     !io_info->isRead) {
 742                         r1_alt_pd = MR_ArPdGet(arRef, physArm + 1, map);
 743                         if (r1_alt_pd != MR_PD_INVALID)
 744                                 io_info->r1_alt_dev_handle =
 745                                 MR_PdDevHandleGet(r1_alt_pd, map);
 746                 }
 747         } else {
 748                 if ((raid->level >= 5) &&
 749                         ((instance->adapter_type == THUNDERBOLT_SERIES)  ||
 750                         ((instance->adapter_type == INVADER_SERIES) &&
 751                         (raid->regTypeReqOnRead != REGION_TYPE_UNUSED))))
 752                         pRAID_Context->reg_lock_flags = REGION_TYPE_EXCLUSIVE;
 753                 else if (raid->level == 1) {
 754                         physArm = physArm + 1;
 755                         pd = MR_ArPdGet(arRef, physArm, map);
 756                         if (pd != MR_PD_INVALID) {
 757                                 *pDevHandle = MR_PdDevHandleGet(pd, map);
 758                                 *pPdInterface = MR_PdInterfaceTypeGet(pd, map);
 759                         }
 760                 }
 761         }
 762
 763         *pdBlock += stripRef + le64_to_cpu(MR_LdSpanPtrGet(ld, span, map)->startBlk);
 764         if (instance->adapter_type >= VENTURA_SERIES) {
 765                 ((struct RAID_CONTEXT_G35 *)pRAID_Context)->span_arm =
 766                         (span << RAID_CTX_SPANARM_SPAN_SHIFT) | physArm;
 767                 io_info->span_arm =
 768                         (span << RAID_CTX_SPANARM_SPAN_SHIFT) | physArm;
 769         } else {
 770                 pRAID_Context->span_arm =
 771                         (span << RAID_CTX_SPANARM_SPAN_SHIFT) | physArm;
 772                 io_info->span_arm = pRAID_Context->span_arm;
 773         }
 774         io_info->pd_after_lb = pd;
 775         return retval;
 776 }
 777
 778 /*
 779 ******************************************************************************
 780 *
 781 * This routine calculates the arm, span and block for the specified stripe and
 782 * reference in stripe.
 783 *
 784 * Inputs :
 785 *
 786 *    ld   - Logical drive number
 787 *    stripRow        - Stripe number
 788 *    stripRef    - Reference in stripe
 789 *
 790 * Outputs :
 791 *
 792 *    span          - Span number
 793 *    block         - Absolute Block number in the physical disk
 794 */
 795 u8 MR_GetPhyParams(struct megasas_instance *instance, u32 ld, u64 stripRow,
 796                 u16 stripRef, struct IO_REQUEST_INFO *io_info,
 797                 struct RAID_CONTEXT *pRAID_Context,
 798                 struct MR_DRV_RAID_MAP_ALL *map)
 799 {
 800         struct MR_LD_RAID  *raid = MR_LdRaidGet(ld, map);
 801         u32         pd, arRef, r1_alt_pd;
 802         u8          physArm, span;
 803         u64         row;
 804         u8          retval = true;
 805         u64         *pdBlock = &io_info->pdBlock;
 806         __le16      *pDevHandle = &io_info->devHandle;
 807         u8          *pPdInterface = &io_info->pd_interface;
 808         struct fusion_context *fusion;
 809
 810         fusion = instance->ctrl_context;
 811         *pDevHandle = cpu_to_le16(MR_DEVHANDLE_INVALID);
 812
 813         row =  mega_div64_32(stripRow, raid->rowDataSize);
 814
 815         if (raid->level == 6) {
 816                 /* logical arm within row */
 817                 u32 logArm =  mega_mod64(stripRow, raid->rowDataSize);
 818                 u32 rowMod, armQ, arm;
 819
 820                 if (raid->rowSize == 0)
 821                         return false;
 822                 /* get logical row mod */
 823                 rowMod = mega_mod64(row, raid->rowSize);
 824                 armQ = raid->rowSize-1-rowMod; /* index of Q drive */
 825                 arm = armQ+1+logArm; /* data always logically follows Q */
 826                 if (arm >= raid->rowSize) /* handle wrap condition */
 827                         arm -= raid->rowSize;
 828                 physArm = (u8)arm;
 829         } else  {
 830                 if (raid->modFactor == 0)
 831                         return false;
 832                 physArm = MR_LdDataArmGet(ld,  mega_mod64(stripRow,
 833                                                           raid->modFactor),
 834                                           map);
 835         }
 836
 837         if (raid->spanDepth == 1) {
 838                 span = 0;
 839                 *pdBlock = row << raid->stripeShift;
 840         } else {
 841                 span = (u8)MR_GetSpanBlock(ld, row, pdBlock, map);
 842                 if (span == SPAN_INVALID)
 843                         return false;
 844         }
 845
 846         /* Get the array on which this span is present */
 847         arRef       = MR_LdSpanArrayGet(ld, span, map);
 848         pd          = MR_ArPdGet(arRef, physArm, map); /* Get the pd */
 849
 850         if (pd != MR_PD_INVALID) {
 851                 /* Get dev handle from Pd. */
 852                 *pDevHandle = MR_PdDevHandleGet(pd, map);
 853                 *pPdInterface = MR_PdInterfaceTypeGet(pd, map);
 854                 /* get second pd also for raid 1/10 fast path writes*/
 855                 if ((instance->adapter_type >= VENTURA_SERIES) &&
 856                     (raid->level == 1) &&
 857                     !io_info->isRead) {
 858                         r1_alt_pd = MR_ArPdGet(arRef, physArm + 1, map);
 859                         if (r1_alt_pd != MR_PD_INVALID)
 860                                 io_info->r1_alt_dev_handle =
 861                                         MR_PdDevHandleGet(r1_alt_pd, map);
 862                 }
 863         } else {
 864                 if ((raid->level >= 5) &&
 865                         ((instance->adapter_type == THUNDERBOLT_SERIES)  ||
 866                         ((instance->adapter_type == INVADER_SERIES) &&
 867                         (raid->regTypeReqOnRead != REGION_TYPE_UNUSED))))
 868                         pRAID_Context->reg_lock_flags = REGION_TYPE_EXCLUSIVE;
 869                 else if (raid->level == 1) {
 870                         /* Get alternate Pd. */
 871                         physArm = physArm + 1;
 872                         pd = MR_ArPdGet(arRef, physArm, map);
 873                         if (pd != MR_PD_INVALID) {
 874                                 /* Get dev handle from Pd */
 875                                 *pDevHandle = MR_PdDevHandleGet(pd, map);
 876                                 *pPdInterface = MR_PdInterfaceTypeGet(pd, map);
 877                         }
 878                 }
 879         }
 880
 881         *pdBlock += stripRef + le64_to_cpu(MR_LdSpanPtrGet(ld, span, map)->startBlk);
 882         if (instance->adapter_type >= VENTURA_SERIES) {
 883                 ((struct RAID_CONTEXT_G35 *)pRAID_Context)->span_arm =
 884                                 (span << RAID_CTX_SPANARM_SPAN_SHIFT) | physArm;
 885                 io_info->span_arm =
 886                                 (span << RAID_CTX_SPANARM_SPAN_SHIFT) | physArm;
 887         } else {
 888                 pRAID_Context->span_arm =
 889                         (span << RAID_CTX_SPANARM_SPAN_SHIFT) | physArm;
 890                 io_info->span_arm = pRAID_Context->span_arm;
 891         }
 892         io_info->pd_after_lb = pd;
 893         return retval;
 894 }
 895
 896 /*
 897  * mr_get_phy_params_r56_rmw -  Calculate parameters for R56 CTIO write operation
 898  * @instance:                   Adapter soft state
 899  * @ld:                         LD index
 900  * @stripNo:                    Strip Number
 901  * @io_info:                    IO info structure pointer
 902  * pRAID_Context:               RAID context pointer
 903  * map:                         RAID map pointer
 904  *
 905  * This routine calculates the logical arm, data Arm, row number and parity arm
 906  * for R56 CTIO write operation.
 907  */
 908 static void mr_get_phy_params_r56_rmw(struct megasas_instance *instance,
 909                             u32 ld, u64 stripNo,
 910                             struct IO_REQUEST_INFO *io_info,
 911                             struct RAID_CONTEXT_G35 *pRAID_Context,
 912                             struct MR_DRV_RAID_MAP_ALL *map)
 913 {
 914         struct MR_LD_RAID  *raid = MR_LdRaidGet(ld, map);
 915         u8          span, dataArms, arms, dataArm, logArm;
 916         s8          rightmostParityArm, PParityArm;
 917         u64         rowNum;
 918         u64 *pdBlock = &io_info->pdBlock;
 919
 920         dataArms = raid->rowDataSize;
 921         arms = raid->rowSize;
 922
 923         rowNum =  mega_div64_32(stripNo, dataArms);
 924         /* parity disk arm, first arm is 0 */
 925         rightmostParityArm = (arms - 1) - mega_mod64(rowNum, arms);
 926
 927         /* logical arm within row */
 928         logArm =  mega_mod64(stripNo, dataArms);
 929         /* physical arm for data */
 930         dataArm = mega_mod64((rightmostParityArm + 1 + logArm), arms);
 931
 932         if (raid->spanDepth == 1) {
 933                 span = 0;
 934         } else {
 935                 span = (u8)MR_GetSpanBlock(ld, rowNum, pdBlock, map);
 936                 if (span == SPAN_INVALID)
 937                         return;
 938         }
 939
 940         if (raid->level == 6) {
 941                 /* P Parity arm, note this can go negative adjust if negative */
 942                 PParityArm = (arms - 2) - mega_mod64(rowNum, arms);
 943
 944                 if (PParityArm < 0)
 945                         PParityArm += arms;
 946
 947                 /* rightmostParityArm is P-Parity for RAID 5 and Q-Parity for RAID */
 948                 pRAID_Context->flow_specific.r56_arm_map = rightmostParityArm;
 949                 pRAID_Context->flow_specific.r56_arm_map |=
 950                                     (u16)(PParityArm << RAID_CTX_R56_P_ARM_SHIFT);
 951         } else {
 952                 pRAID_Context->flow_specific.r56_arm_map |=
 953                                     (u16)(rightmostParityArm << RAID_CTX_R56_P_ARM_SHIFT);
 954         }
 955
 956         pRAID_Context->reg_lock_row_lba = cpu_to_le64(rowNum);
 957         pRAID_Context->flow_specific.r56_arm_map |=
 958                                    (u16)(logArm << RAID_CTX_R56_LOG_ARM_SHIFT);
 959         cpu_to_le16s(&pRAID_Context->flow_specific.r56_arm_map);
 960         pRAID_Context->span_arm = (span << RAID_CTX_SPANARM_SPAN_SHIFT) | dataArm;
 961         pRAID_Context->raid_flags = (MR_RAID_FLAGS_IO_SUB_TYPE_R56_DIV_OFFLOAD <<
 962                                     MR_RAID_CTX_RAID_FLAGS_IO_SUB_TYPE_SHIFT);
 963
 964         return;
 965 }
 966
 967 /*
 968 ******************************************************************************
 969 *
 970 * MR_BuildRaidContext function
 971 *
 972 * This function will initiate command processing.  The start/end row and strip
 973 * information is calculated then the lock is acquired.
 974 * This function will return 0 if region lock was acquired OR return num strips
 975 */
 976 u8
 977 MR_BuildRaidContext(struct megasas_instance *instance,
 978                     struct IO_REQUEST_INFO *io_info,
 979                     struct RAID_CONTEXT *pRAID_Context,
 980                     struct MR_DRV_RAID_MAP_ALL *map, u8 **raidLUN)
 981 {
 982         struct fusion_context *fusion;
 983         struct MR_LD_RAID  *raid;
 984         u32         stripSize, stripe_mask;
 985         u64         endLba, endStrip, endRow, start_row, start_strip;
 986         u64         regStart;
 987         u32         regSize;
 988         u8          num_strips, numRows;
 989         u16         ref_in_start_stripe, ref_in_end_stripe;
 990         u64         ldStartBlock;
 991         u32         numBlocks, ldTgtId;
 992         u8          isRead;
 993         u8          retval = 0;
 994         u8          startlba_span = SPAN_INVALID;
 995         u64 *pdBlock = &io_info->pdBlock;
 996         u16         ld;
 997
 998         ldStartBlock = io_info->ldStartBlock;
 999         numBlocks = io_info->numBlocks;
1000         ldTgtId = io_info->ldTgtId;
1001         isRead = io_info->isRead;
1002         io_info->IoforUnevenSpan = 0;
1003         io_info->start_span     = SPAN_INVALID;
1004         fusion = instance->ctrl_context;
1005
1006         ld = MR_TargetIdToLdGet(ldTgtId, map);
1007         raid = MR_LdRaidGet(ld, map);
1008         /*check read ahead bit*/
1009         io_info->ra_capable = raid->capability.ra_capable;
1010
1011         /*
1012          * if rowDataSize @RAID map and spanRowDataSize @SPAN INFO are zero
1013          * return FALSE
1014          */
1015         if (raid->rowDataSize == 0) {
1016                 if (MR_LdSpanPtrGet(ld, 0, map)->spanRowDataSize == 0)
1017                         return false;
1018                 else if (instance->UnevenSpanSupport) {
1019                         io_info->IoforUnevenSpan = 1;
1020                 } else {
1021                         dev_info(&instance->pdev->dev,
1022                                 "raid->rowDataSize is 0, but has SPAN[0]"
1023                                 "rowDataSize = 0x%0x,"
1024                                 "but there is _NO_ UnevenSpanSupport\n",
1025                                 MR_LdSpanPtrGet(ld, 0, map)->spanRowDataSize);
1026                         return false;
1027                 }
1028         }
1029
1030         stripSize = 1 << raid->stripeShift;
1031         stripe_mask = stripSize-1;
1032
1033         io_info->data_arms = raid->rowDataSize;
1034
1035         /*
1036          * calculate starting row and stripe, and number of strips and rows
1037          */
1038         start_strip         = ldStartBlock >> raid->stripeShift;
1039         ref_in_start_stripe = (u16)(ldStartBlock & stripe_mask);
1040         endLba              = ldStartBlock + numBlocks - 1;
1041         ref_in_end_stripe   = (u16)(endLba & stripe_mask);
1042         endStrip            = endLba >> raid->stripeShift;
1043         num_strips          = (u8)(endStrip - start_strip + 1); /* End strip */
1044
1045         if (io_info->IoforUnevenSpan) {
1046                 start_row = get_row_from_strip(instance, ld, start_strip, map);
1047                 endRow    = get_row_from_strip(instance, ld, endStrip, map);
1048                 if (start_row == -1ULL || endRow == -1ULL) {
1049                         dev_info(&instance->pdev->dev, "return from %s %d."
1050                                 "Send IO w/o region lock.\n",
1051                                 __func__, __LINE__);
1052                         return false;
1053                 }
1054
1055                 if (raid->spanDepth == 1) {
1056                         startlba_span = 0;
1057                         *pdBlock = start_row << raid->stripeShift;
1058                 } else
1059                         startlba_span = (u8)mr_spanset_get_span_block(instance,
1060                                                 ld, start_row, pdBlock, map);
1061                 if (startlba_span == SPAN_INVALID) {
1062                         dev_info(&instance->pdev->dev, "return from %s %d"
1063                                 "for row 0x%llx,start strip %llx"
1064                                 "endSrip %llx\n", __func__, __LINE__,
1065                                 (unsigned long long)start_row,
1066                                 (unsigned long long)start_strip,
1067                                 (unsigned long long)endStrip);
1068                         return false;
1069                 }
1070                 io_info->start_span     = startlba_span;
1071                 io_info->start_row      = start_row;
1072         } else {
1073                 start_row = mega_div64_32(start_strip, raid->rowDataSize);
1074                 endRow    = mega_div64_32(endStrip, raid->rowDataSize);
1075         }
1076         numRows = (u8)(endRow - start_row + 1);
1077
1078         /*
1079          * calculate region info.
1080          */
1081
1082         /* assume region is at the start of the first row */
1083         regStart            = start_row << raid->stripeShift;
1084         /* assume this IO needs the full row - we'll adjust if not true */
1085         regSize             = stripSize;
1086
1087         io_info->do_fp_rlbypass = raid->capability.fpBypassRegionLock;
1088
1089         /* Check if we can send this I/O via FastPath */
1090         if (raid->capability.fpCapable) {
1091                 if (isRead)
1092                         io_info->fpOkForIo = (raid->capability.fpReadCapable &&
1093                                               ((num_strips == 1) ||
1094                                                raid->capability.
1095                                                fpReadAcrossStripe));
1096                 else
1097                         io_info->fpOkForIo = (raid->capability.fpWriteCapable &&
1098                                               ((num_strips == 1) ||
1099                                                raid->capability.
1100                                                fpWriteAcrossStripe));
1101         } else
1102                 io_info->fpOkForIo = false;
1103
1104         if (numRows == 1) {
1105                 /* single-strip IOs can always lock only the data needed */
1106                 if (num_strips == 1) {
1107                         regStart += ref_in_start_stripe;
1108                         regSize = numBlocks;
1109                 }
1110                 /* multi-strip IOs always need to full stripe locked */
1111         } else if (io_info->IoforUnevenSpan == 0) {
1112                 /*
1113                  * For Even span region lock optimization.
1114                  * If the start strip is the last in the start row
1115                  */
1116                 if (start_strip == (start_row + 1) * raid->rowDataSize - 1) {
1117                         regStart += ref_in_start_stripe;
1118                         /* initialize count to sectors from startref to end
1119                            of strip */
1120                         regSize = stripSize - ref_in_start_stripe;
1121                 }
1122
1123                 /* add complete rows in the middle of the transfer */
1124                 if (numRows > 2)
1125                         regSize += (numRows-2) << raid->stripeShift;
1126
1127                 /* if IO ends within first strip of last row*/
1128                 if (endStrip == endRow*raid->rowDataSize)
1129                         regSize += ref_in_end_stripe+1;
1130                 else
1131                         regSize += stripSize;
1132         } else {
1133                 /*
1134                  * For Uneven span region lock optimization.
1135                  * If the start strip is the last in the start row
1136                  */
1137                 if (start_strip == (get_strip_from_row(instance, ld, start_row, map) +
1138                                 SPAN_ROW_DATA_SIZE(map, ld, startlba_span) - 1)) {
1139                         regStart += ref_in_start_stripe;
1140                         /* initialize count to sectors from
1141                          * startRef to end of strip
1142                          */
1143                         regSize = stripSize - ref_in_start_stripe;
1144                 }
1145                 /* Add complete rows in the middle of the transfer*/
1146
1147                 if (numRows > 2)
1148                         /* Add complete rows in the middle of the transfer*/
1149                         regSize += (numRows-2) << raid->stripeShift;
1150
1151                 /* if IO ends within first strip of last row */
1152                 if (endStrip == get_strip_from_row(instance, ld, endRow, map))
1153                         regSize += ref_in_end_stripe + 1;
1154                 else
1155                         regSize += stripSize;
1156         }
1157
1158         pRAID_Context->timeout_value =
1159                 cpu_to_le16(raid->fpIoTimeoutForLd ?
1160                             raid->fpIoTimeoutForLd :
1161                             map->raidMap.fpPdIoTimeoutSec);
1162         if (instance->adapter_type == INVADER_SERIES)
1163                 pRAID_Context->reg_lock_flags = (isRead) ?
1164                         raid->regTypeReqOnRead : raid->regTypeReqOnWrite;
1165         else if (instance->adapter_type == THUNDERBOLT_SERIES)
1166                 pRAID_Context->reg_lock_flags = (isRead) ?
1167                         REGION_TYPE_SHARED_READ : raid->regTypeReqOnWrite;
1168         pRAID_Context->virtual_disk_tgt_id = raid->targetId;
1169         pRAID_Context->reg_lock_row_lba    = cpu_to_le64(regStart);
1170         pRAID_Context->reg_lock_length    = cpu_to_le32(regSize);
1171         pRAID_Context->config_seq_num   = raid->seqNum;
1172         /* save pointer to raid->LUN array */
1173         *raidLUN = raid->LUN;
1174
1175         /* Aero R5/6 Division Offload for WRITE */
1176         if (fusion->r56_div_offload && (raid->level >= 5) && !isRead) {
1177                 mr_get_phy_params_r56_rmw(instance, ld, start_strip, io_info,
1178                                        (struct RAID_CONTEXT_G35 *)pRAID_Context,
1179                                        map);
1180                 return true;
1181         }
1182
1183         /*Get Phy Params only if FP capable, or else leave it to MR firmware
1184           to do the calculation.*/
1185         if (io_info->fpOkForIo) {
1186                 retval = io_info->IoforUnevenSpan ?
1187                                 mr_spanset_get_phy_params(instance, ld,
1188                                         start_strip, ref_in_start_stripe,
1189                                         io_info, pRAID_Context, map) :
1190                                 MR_GetPhyParams(instance, ld, start_strip,
1191                                         ref_in_start_stripe, io_info,
1192                                         pRAID_Context, map);
1193                 /* If IO on an invalid Pd, then FP is not possible.*/
1194                 if (io_info->devHandle == MR_DEVHANDLE_INVALID)
1195                         io_info->fpOkForIo = false;
1196                 return retval;
1197         } else if (isRead) {
1198                 uint stripIdx;
1199                 for (stripIdx = 0; stripIdx < num_strips; stripIdx++) {
1200                         retval = io_info->IoforUnevenSpan ?
1201                                 mr_spanset_get_phy_params(instance, ld,
1202                                     start_strip + stripIdx,
1203                                     ref_in_start_stripe, io_info,
1204                                     pRAID_Context, map) :
1205                                 MR_GetPhyParams(instance, ld,
1206                                     start_strip + stripIdx, ref_in_start_stripe,
1207                                     io_info, pRAID_Context, map);
1208                         if (!retval)
1209                                 return true;
1210                 }
1211         }
1212         return true;
1213 }
1214
1215 /*
1216 ******************************************************************************
1217 *
1218 * This routine pepare spanset info from Valid Raid map and store it into
1219 * local copy of ldSpanInfo per instance data structure.
1220 *
1221 * Inputs :
1222 * map    - LD map
1223 * ldSpanInfo - ldSpanInfo per HBA instance
1224 *
1225 */
1226 void mr_update_span_set(struct MR_DRV_RAID_MAP_ALL *map,
1227         PLD_SPAN_INFO ldSpanInfo)
1228 {
1229         u8   span, count;
1230         u32  element, span_row_width;
1231         u64  span_row;
1232         struct MR_LD_RAID *raid;
1233         LD_SPAN_SET *span_set, *span_set_prev;
1234         struct MR_QUAD_ELEMENT    *quad;
1235         int ldCount;
1236         u16 ld;
1237
1238
1239         for (ldCount = 0; ldCount < MAX_LOGICAL_DRIVES_EXT; ldCount++) {
1240                 ld = MR_TargetIdToLdGet(ldCount, map);
1241                 if (ld >= (MAX_LOGICAL_DRIVES_EXT - 1))
1242                         continue;
1243                 raid = MR_LdRaidGet(ld, map);
1244                 for (element = 0; element < MAX_QUAD_DEPTH; element++) {
1245                         for (span = 0; span < raid->spanDepth; span++) {
1246                                 if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
1247                                         block_span_info.noElements) <
1248                                         element + 1)
1249                                         continue;
1250                                 span_set = &(ldSpanInfo[ld].span_set[element]);
1251                                 quad = &map->raidMap.ldSpanMap[ld].
1252                                         spanBlock[span].block_span_info.
1253                                         quad[element];
1254
1255                                 span_set->diff = le32_to_cpu(quad->diff);
1256
1257                                 for (count = 0, span_row_width = 0;
1258                                         count < raid->spanDepth; count++) {
1259                                         if (le32_to_cpu(map->raidMap.ldSpanMap[ld].
1260                                                 spanBlock[count].
1261                                                 block_span_info.
1262                                                 noElements) >= element + 1) {
1263                                                 span_set->strip_offset[count] =
1264                                                         span_row_width;
1265                                                 span_row_width +=
1266                                                         MR_LdSpanPtrGet
1267                                                         (ld, count, map)->spanRowDataSize;
1268                                         }
1269                                 }
1270
1271                                 span_set->span_row_data_width = span_row_width;
1272                                 span_row = mega_div64_32(((le64_to_cpu(quad->logEnd) -
1273                                         le64_to_cpu(quad->logStart)) + le32_to_cpu(quad->diff)),
1274                                         le32_to_cpu(quad->diff));
1275
1276                                 if (element == 0) {
1277                                         span_set->log_start_lba = 0;
1278                                         span_set->log_end_lba =
1279                                                 ((span_row << raid->stripeShift)
1280                                                 * span_row_width) - 1;
1281
1282                                         span_set->span_row_start = 0;
1283                                         span_set->span_row_end = span_row - 1;
1284
1285                                         span_set->data_strip_start = 0;
1286                                         span_set->data_strip_end =
1287                                                 (span_row * span_row_width) - 1;
1288
1289                                         span_set->data_row_start = 0;
1290                                         span_set->data_row_end =
1291                                                 (span_row * le32_to_cpu(quad->diff)) - 1;
1292                                 } else {
1293                                         span_set_prev = &(ldSpanInfo[ld].
1294                                                         span_set[element - 1]);
1295                                         span_set->log_start_lba =
1296                                                 span_set_prev->log_end_lba + 1;
1297                                         span_set->log_end_lba =
1298                                                 span_set->log_start_lba +
1299                                                 ((span_row << raid->stripeShift)
1300                                                 * span_row_width) - 1;
1301
1302                                         span_set->span_row_start =
1303                                                 span_set_prev->span_row_end + 1;
1304                                         span_set->span_row_end =
1305                                         span_set->span_row_start + span_row - 1;
1306
1307                                         span_set->data_strip_start =
1308                                         span_set_prev->data_strip_end + 1;
1309                                         span_set->data_strip_end =
1310                                                 span_set->data_strip_start +
1311                                                 (span_row * span_row_width) - 1;
1312
1313                                         span_set->data_row_start =
1314                                                 span_set_prev->data_row_end + 1;
1315                                         span_set->data_row_end =
1316                                                 span_set->data_row_start +
1317                                                 (span_row * le32_to_cpu(quad->diff)) - 1;
1318                                 }
1319                                 break;
1320                 }
1321                 if (span == raid->spanDepth)
1322                         break;
1323             }
1324         }
1325 }
1326
1327 void mr_update_load_balance_params(struct MR_DRV_RAID_MAP_ALL *drv_map,
1328         struct LD_LOAD_BALANCE_INFO *lbInfo)
1329 {
1330         int ldCount;
1331         u16 ld;
1332         struct MR_LD_RAID *raid;
1333
1334         if (lb_pending_cmds > 128 || lb_pending_cmds < 1)
1335                 lb_pending_cmds = LB_PENDING_CMDS_DEFAULT;
1336
1337         for (ldCount = 0; ldCount < MAX_LOGICAL_DRIVES_EXT; ldCount++) {
1338                 ld = MR_TargetIdToLdGet(ldCount, drv_map);
1339                 if (ld >= MAX_LOGICAL_DRIVES_EXT - 1) {
1340                         lbInfo[ldCount].loadBalanceFlag = 0;
1341                         continue;
1342                 }
1343
1344                 raid = MR_LdRaidGet(ld, drv_map);
1345                 if ((raid->level != 1) ||
1346                         (raid->ldState != MR_LD_STATE_OPTIMAL)) {
1347                         lbInfo[ldCount].loadBalanceFlag = 0;
1348                         continue;
1349                 }
1350                 lbInfo[ldCount].loadBalanceFlag = 1;
1351         }
1352 }
1353
1354 u8 megasas_get_best_arm_pd(struct megasas_instance *instance,
1355                            struct LD_LOAD_BALANCE_INFO *lbInfo,
1356                            struct IO_REQUEST_INFO *io_info,
1357                            struct MR_DRV_RAID_MAP_ALL *drv_map)
1358 {
1359         struct MR_LD_RAID  *raid;
1360         u16     pd1_dev_handle;
1361         u16     pend0, pend1, ld;
1362         u64     diff0, diff1;
1363         u8      bestArm, pd0, pd1, span, arm;
1364         u32     arRef, span_row_size;
1365
1366         u64 block = io_info->ldStartBlock;
1367         u32 count = io_info->numBlocks;
1368
1369         span = ((io_info->span_arm & RAID_CTX_SPANARM_SPAN_MASK)
1370                         >> RAID_CTX_SPANARM_SPAN_SHIFT);
1371         arm = (io_info->span_arm & RAID_CTX_SPANARM_ARM_MASK);
1372
1373         ld = MR_TargetIdToLdGet(io_info->ldTgtId, drv_map);
1374         raid = MR_LdRaidGet(ld, drv_map);
1375         span_row_size = instance->UnevenSpanSupport ?
1376                         SPAN_ROW_SIZE(drv_map, ld, span) : raid->rowSize;
1377
1378         arRef = MR_LdSpanArrayGet(ld, span, drv_map);
1379         pd0 = MR_ArPdGet(arRef, arm, drv_map);
1380         pd1 = MR_ArPdGet(arRef, (arm + 1) >= span_row_size ?
1381                 (arm + 1 - span_row_size) : arm + 1, drv_map);
1382
1383         /* Get PD1 Dev Handle */
1384
1385         pd1_dev_handle = MR_PdDevHandleGet(pd1, drv_map);
1386
1387         if (pd1_dev_handle == MR_DEVHANDLE_INVALID) {
1388                 bestArm = arm;
1389         } else {
1390                 /* get the pending cmds for the data and mirror arms */
1391                 pend0 = atomic_read(&lbInfo->scsi_pending_cmds[pd0]);
1392                 pend1 = atomic_read(&lbInfo->scsi_pending_cmds[pd1]);
1393
1394                 /* Determine the disk whose head is nearer to the req. block */
1395                 diff0 = ABS_DIFF(block, lbInfo->last_accessed_block[pd0]);
1396                 diff1 = ABS_DIFF(block, lbInfo->last_accessed_block[pd1]);
1397                 bestArm = (diff0 <= diff1 ? arm : arm ^ 1);
1398
1399                 /* Make balance count from 16 to 4 to
1400                  *  keep driver in sync with Firmware
1401                  */
1402                 if ((bestArm == arm && pend0 > pend1 + lb_pending_cmds)  ||
1403                     (bestArm != arm && pend1 > pend0 + lb_pending_cmds))
1404                         bestArm ^= 1;
1405
1406                 /* Update the last accessed block on the correct pd */
1407                 io_info->span_arm =
1408                         (span << RAID_CTX_SPANARM_SPAN_SHIFT) | bestArm;
1409                 io_info->pd_after_lb = (bestArm == arm) ? pd0 : pd1;
1410         }
1411
1412         lbInfo->last_accessed_block[io_info->pd_after_lb] = block + count - 1;
1413         return io_info->pd_after_lb;
1414 }
1415
1416 __le16 get_updated_dev_handle(struct megasas_instance *instance,
1417                               struct LD_LOAD_BALANCE_INFO *lbInfo,
1418                               struct IO_REQUEST_INFO *io_info,
1419                               struct MR_DRV_RAID_MAP_ALL *drv_map)
1420 {
1421         u8 arm_pd;
1422         __le16 devHandle;
1423
1424         /* get best new arm (PD ID) */
1425         arm_pd  = megasas_get_best_arm_pd(instance, lbInfo, io_info, drv_map);
1426         devHandle = MR_PdDevHandleGet(arm_pd, drv_map);
1427         io_info->pd_interface = MR_PdInterfaceTypeGet(arm_pd, drv_map);
1428         atomic_inc(&lbInfo->scsi_pending_cmds[arm_pd]);
1429
1430         return devHandle;
1431 }