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