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, debugBlk;
 390                                         blk =  mega_div64_32((row-le64_to_cpu(quad->logStart)), le32_to_cpu(quad->diff));
 391                                         debugBlk = blk;
 392
 393                                         blk = (blk + le64_to_cpu(quad->offsetInSpan)) << raid->stripeShift;
 394                                         *span_blk = blk;
 395                                 }
 396                                 return span;
 397                         }
 398                 }
 399         }
 400         return SPAN_INVALID;
 401 }
 402
 403 /*
 404 ******************************************************************************
 405 *
 406 * This routine calculates the Span block for given row using spanset.
 407 *
 408 * Inputs :
 409 *    instance - HBA instance
 410 *    ld   - Logical drive number
 411 *    row        - Row number
 412 *    map    - LD map
 413 *
 414 * Outputs :
 415 *
 416 *    span          - Span number
 417 *    block         - Absolute Block number in the physical disk
 418 *    div_error     - Devide error code.
 419 */
 420
 421 u32 mr_spanset_get_span_block(struct megasas_instance *instance,
 422                 u32 ld, u64 row, u64 *span_blk, struct MR_DRV_RAID_MAP_ALL *map)
 423 {
 424         struct fusion_context *fusion = instance->ctrl_context;
 425         struct MR_LD_RAID         *raid = MR_LdRaidGet(ld, map);
 426         LD_SPAN_SET *span_set;
 427         struct MR_QUAD_ELEMENT    *quad;
 428         u32    span, info;
 429         PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span;
 430
 431         for (info = 0; info < MAX_QUAD_DEPTH; info++) {
 432                 span_set = &(ldSpanInfo[ld].span_set[info]);
 433
 434                 if (span_set->span_row_data_width == 0)
 435                         break;
 436
 437                 if (row > span_set->data_row_end)
 438                         continue;
 439
 440                 for (span = 0; span < raid->spanDepth; span++)
 441                         if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
 442                                 block_span_info.noElements) >= info+1) {
 443                                 quad = &map->raidMap.ldSpanMap[ld].
 444                                         spanBlock[span].
 445                                         block_span_info.quad[info];
 446                                 if (le32_to_cpu(quad->diff) == 0)
 447                                         return SPAN_INVALID;
 448                                 if (le64_to_cpu(quad->logStart) <= row  &&
 449                                         row <= le64_to_cpu(quad->logEnd)  &&
 450                                         (mega_mod64(row - le64_to_cpu(quad->logStart),
 451                                                 le32_to_cpu(quad->diff))) == 0) {
 452                                         if (span_blk != NULL) {
 453                                                 u64  blk;
 454                                                 blk = mega_div64_32
 455                                                     ((row - le64_to_cpu(quad->logStart)),
 456                                                     le32_to_cpu(quad->diff));
 457                                                 blk = (blk + le64_to_cpu(quad->offsetInSpan))
 458                                                          << raid->stripeShift;
 459                                                 *span_blk = blk;
 460                                         }
 461                                         return span;
 462                                 }
 463                         }
 464         }
 465         return SPAN_INVALID;
 466 }
 467
 468 /*
 469 ******************************************************************************
 470 *
 471 * This routine calculates the row for given strip using spanset.
 472 *
 473 * Inputs :
 474 *    instance - HBA instance
 475 *    ld   - Logical drive number
 476 *    Strip        - Strip
 477 *    map    - LD map
 478 *
 479 * Outputs :
 480 *
 481 *    row         - row associated with strip
 482 */
 483
 484 static u64  get_row_from_strip(struct megasas_instance *instance,
 485         u32 ld, u64 strip, struct MR_DRV_RAID_MAP_ALL *map)
 486 {
 487         struct fusion_context *fusion = instance->ctrl_context;
 488         struct MR_LD_RAID       *raid = MR_LdRaidGet(ld, map);
 489         LD_SPAN_SET     *span_set;
 490         PLD_SPAN_INFO   ldSpanInfo = fusion->log_to_span;
 491         u32             info, strip_offset, span, span_offset;
 492         u64             span_set_Strip, span_set_Row, retval;
 493
 494         for (info = 0; info < MAX_QUAD_DEPTH; info++) {
 495                 span_set = &(ldSpanInfo[ld].span_set[info]);
 496
 497                 if (span_set->span_row_data_width == 0)
 498                         break;
 499                 if (strip > span_set->data_strip_end)
 500                         continue;
 501
 502                 span_set_Strip = strip - span_set->data_strip_start;
 503                 strip_offset = mega_mod64(span_set_Strip,
 504                                 span_set->span_row_data_width);
 505                 span_set_Row = mega_div64_32(span_set_Strip,
 506                                 span_set->span_row_data_width) * span_set->diff;
 507                 for (span = 0, span_offset = 0; span < raid->spanDepth; span++)
 508                         if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
 509                                 block_span_info.noElements) >= info+1) {
 510                                 if (strip_offset >=
 511                                         span_set->strip_offset[span])
 512                                         span_offset++;
 513                                 else
 514                                         break;
 515                         }
 516
 517                 retval = (span_set->data_row_start + span_set_Row +
 518                                 (span_offset - 1));
 519                 return retval;
 520         }
 521         return -1LLU;
 522 }
 523
 524
 525 /*
 526 ******************************************************************************
 527 *
 528 * This routine calculates the Start Strip for given row using spanset.
 529 *
 530 * Inputs :
 531 *    instance - HBA instance
 532 *    ld   - Logical drive number
 533 *    row        - Row number
 534 *    map    - LD map
 535 *
 536 * Outputs :
 537 *
 538 *    Strip         - Start strip associated with row
 539 */
 540
 541 static u64 get_strip_from_row(struct megasas_instance *instance,
 542                 u32 ld, u64 row, struct MR_DRV_RAID_MAP_ALL *map)
 543 {
 544         struct fusion_context *fusion = instance->ctrl_context;
 545         struct MR_LD_RAID         *raid = MR_LdRaidGet(ld, map);
 546         LD_SPAN_SET *span_set;
 547         struct MR_QUAD_ELEMENT    *quad;
 548         PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span;
 549         u32    span, info;
 550         u64  strip;
 551
 552         for (info = 0; info < MAX_QUAD_DEPTH; info++) {
 553                 span_set = &(ldSpanInfo[ld].span_set[info]);
 554
 555                 if (span_set->span_row_data_width == 0)
 556                         break;
 557                 if (row > span_set->data_row_end)
 558                         continue;
 559
 560                 for (span = 0; span < raid->spanDepth; span++)
 561                         if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
 562                                 block_span_info.noElements) >= info+1) {
 563                                 quad = &map->raidMap.ldSpanMap[ld].
 564                                         spanBlock[span].block_span_info.quad[info];
 565                                 if (le64_to_cpu(quad->logStart) <= row  &&
 566                                         row <= le64_to_cpu(quad->logEnd)  &&
 567                                         mega_mod64((row - le64_to_cpu(quad->logStart)),
 568                                         le32_to_cpu(quad->diff)) == 0) {
 569                                         strip = mega_div64_32
 570                                                 (((row - span_set->data_row_start)
 571                                                         - le64_to_cpu(quad->logStart)),
 572                                                         le32_to_cpu(quad->diff));
 573                                         strip *= span_set->span_row_data_width;
 574                                         strip += span_set->data_strip_start;
 575                                         strip += span_set->strip_offset[span];
 576                                         return strip;
 577                                 }
 578                         }
 579         }
 580         dev_err(&instance->pdev->dev, "get_strip_from_row"
 581                 "returns invalid strip for ld=%x, row=%lx\n",
 582                 ld, (long unsigned int)row);
 583         return -1;
 584 }
 585
 586 /*
 587 ******************************************************************************
 588 *
 589 * This routine calculates the Physical Arm for given strip using spanset.
 590 *
 591 * Inputs :
 592 *    instance - HBA instance
 593 *    ld   - Logical drive number
 594 *    strip      - Strip
 595 *    map    - LD map
 596 *
 597 * Outputs :
 598 *
 599 *    Phys Arm         - Phys Arm associated with strip
 600 */
 601
 602 static u32 get_arm_from_strip(struct megasas_instance *instance,
 603         u32 ld, u64 strip, struct MR_DRV_RAID_MAP_ALL *map)
 604 {
 605         struct fusion_context *fusion = instance->ctrl_context;
 606         struct MR_LD_RAID         *raid = MR_LdRaidGet(ld, map);
 607         LD_SPAN_SET *span_set;
 608         PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span;
 609         u32    info, strip_offset, span, span_offset, retval;
 610
 611         for (info = 0 ; info < MAX_QUAD_DEPTH; info++) {
 612                 span_set = &(ldSpanInfo[ld].span_set[info]);
 613
 614                 if (span_set->span_row_data_width == 0)
 615                         break;
 616                 if (strip > span_set->data_strip_end)
 617                         continue;
 618
 619                 strip_offset = (uint)mega_mod64
 620                                 ((strip - span_set->data_strip_start),
 621                                 span_set->span_row_data_width);
 622
 623                 for (span = 0, span_offset = 0; span < raid->spanDepth; span++)
 624                         if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
 625                                 block_span_info.noElements) >= info+1) {
 626                                 if (strip_offset >=
 627                                         span_set->strip_offset[span])
 628                                         span_offset =
 629                                                 span_set->strip_offset[span];
 630                                 else
 631                                         break;
 632                         }
 633
 634                 retval = (strip_offset - span_offset);
 635                 return retval;
 636         }
 637
 638         dev_err(&instance->pdev->dev, "get_arm_from_strip"
 639                 "returns invalid arm for ld=%x strip=%lx\n",
 640                 ld, (long unsigned int)strip);
 641
 642         return -1;
 643 }
 644
 645 /* This Function will return Phys arm */
 646 u8 get_arm(struct megasas_instance *instance, u32 ld, u8 span, u64 stripe,
 647                 struct MR_DRV_RAID_MAP_ALL *map)
 648 {
 649         struct MR_LD_RAID  *raid = MR_LdRaidGet(ld, map);
 650         /* Need to check correct default value */
 651         u32    arm = 0;
 652
 653         switch (raid->level) {
 654         case 0:
 655         case 5:
 656         case 6:
 657                 arm = mega_mod64(stripe, SPAN_ROW_SIZE(map, ld, span));
 658                 break;
 659         case 1:
 660                 /* start with logical arm */
 661                 arm = get_arm_from_strip(instance, ld, stripe, map);
 662                 if (arm != -1U)
 663                         arm *= 2;
 664                 break;
 665         }
 666
 667         return arm;
 668 }
 669
 670
 671 /*
 672 ******************************************************************************
 673 *
 674 * This routine calculates the arm, span and block for the specified stripe and
 675 * reference in stripe using spanset
 676 *
 677 * Inputs :
 678 *
 679 *    ld   - Logical drive number
 680 *    stripRow        - Stripe number
 681 *    stripRef    - Reference in stripe
 682 *
 683 * Outputs :
 684 *
 685 *    span          - Span number
 686 *    block         - Absolute Block number in the physical disk
 687 */
 688 static u8 mr_spanset_get_phy_params(struct megasas_instance *instance, u32 ld,
 689                 u64 stripRow, u16 stripRef, struct IO_REQUEST_INFO *io_info,
 690                 struct RAID_CONTEXT *pRAID_Context,
 691                 struct MR_DRV_RAID_MAP_ALL *map)
 692 {
 693         struct MR_LD_RAID  *raid = MR_LdRaidGet(ld, map);
 694         u32     pd, arRef, r1_alt_pd;
 695         u8      physArm, span;
 696         u64     row;
 697         u8      retval = true;
 698         u64     *pdBlock = &io_info->pdBlock;
 699         __le16  *pDevHandle = &io_info->devHandle;
 700         u8      *pPdInterface = &io_info->pd_interface;
 701         u32     logArm, rowMod, armQ, arm;
 702         struct fusion_context *fusion;
 703
 704         fusion = instance->ctrl_context;
 705         *pDevHandle = cpu_to_le16(MR_DEVHANDLE_INVALID);
 706
 707         /*Get row and span from io_info for Uneven Span IO.*/
 708         row         = io_info->start_row;
 709         span        = io_info->start_span;
 710
 711
 712         if (raid->level == 6) {
 713                 logArm = get_arm_from_strip(instance, ld, stripRow, map);
 714                 if (logArm == -1U)
 715                         return false;
 716                 rowMod = mega_mod64(row, SPAN_ROW_SIZE(map, ld, span));
 717                 armQ = SPAN_ROW_SIZE(map, ld, span) - 1 - rowMod;
 718                 arm = armQ + 1 + logArm;
 719                 if (arm >= SPAN_ROW_SIZE(map, ld, span))
 720                         arm -= SPAN_ROW_SIZE(map, ld, span);
 721                 physArm = (u8)arm;
 722         } else
 723                 /* Calculate the arm */
 724                 physArm = get_arm(instance, ld, span, stripRow, map);
 725         if (physArm == 0xFF)
 726                 return false;
 727
 728         arRef       = MR_LdSpanArrayGet(ld, span, map);
 729         pd          = MR_ArPdGet(arRef, physArm, map);
 730
 731         if (pd != MR_PD_INVALID) {
 732                 *pDevHandle = MR_PdDevHandleGet(pd, map);
 733                 *pPdInterface = MR_PdInterfaceTypeGet(pd, map);
 734                 /* get second pd also for raid 1/10 fast path writes*/
 735                 if ((instance->adapter_type >= VENTURA_SERIES) &&
 736                     (raid->level == 1) &&
 737                     !io_info->isRead) {
 738                         r1_alt_pd = MR_ArPdGet(arRef, physArm + 1, map);
 739                         if (r1_alt_pd != MR_PD_INVALID)
 740                                 io_info->r1_alt_dev_handle =
 741                                 MR_PdDevHandleGet(r1_alt_pd, map);
 742                 }
 743         } else {
 744                 if ((raid->level >= 5) &&
 745                         ((instance->adapter_type == THUNDERBOLT_SERIES)  ||
 746                         ((instance->adapter_type == INVADER_SERIES) &&
 747                         (raid->regTypeReqOnRead != REGION_TYPE_UNUSED))))
 748                         pRAID_Context->reg_lock_flags = REGION_TYPE_EXCLUSIVE;
 749                 else if (raid->level == 1) {
 750                         physArm = physArm + 1;
 751                         pd = MR_ArPdGet(arRef, physArm, map);
 752                         if (pd != MR_PD_INVALID) {
 753                                 *pDevHandle = MR_PdDevHandleGet(pd, map);
 754                                 *pPdInterface = MR_PdInterfaceTypeGet(pd, map);
 755                         }
 756                 }
 757         }
 758
 759         *pdBlock += stripRef + le64_to_cpu(MR_LdSpanPtrGet(ld, span, map)->startBlk);
 760         if (instance->adapter_type >= VENTURA_SERIES) {
 761                 ((struct RAID_CONTEXT_G35 *)pRAID_Context)->span_arm =
 762                         (span << RAID_CTX_SPANARM_SPAN_SHIFT) | physArm;
 763                 io_info->span_arm =
 764                         (span << RAID_CTX_SPANARM_SPAN_SHIFT) | physArm;
 765         } else {
 766                 pRAID_Context->span_arm =
 767                         (span << RAID_CTX_SPANARM_SPAN_SHIFT) | physArm;
 768                 io_info->span_arm = pRAID_Context->span_arm;
 769         }
 770         io_info->pd_after_lb = pd;
 771         return retval;
 772 }
 773
 774 /*
 775 ******************************************************************************
 776 *
 777 * This routine calculates the arm, span and block for the specified stripe and
 778 * reference in stripe.
 779 *
 780 * Inputs :
 781 *
 782 *    ld   - Logical drive number
 783 *    stripRow        - Stripe number
 784 *    stripRef    - Reference in stripe
 785 *
 786 * Outputs :
 787 *
 788 *    span          - Span number
 789 *    block         - Absolute Block number in the physical disk
 790 */
 791 u8 MR_GetPhyParams(struct megasas_instance *instance, u32 ld, u64 stripRow,
 792                 u16 stripRef, struct IO_REQUEST_INFO *io_info,
 793                 struct RAID_CONTEXT *pRAID_Context,
 794                 struct MR_DRV_RAID_MAP_ALL *map)
 795 {
 796         struct MR_LD_RAID  *raid = MR_LdRaidGet(ld, map);
 797         u32         pd, arRef, r1_alt_pd;
 798         u8          physArm, span;
 799         u64         row;
 800         u8          retval = true;
 801         u64         *pdBlock = &io_info->pdBlock;
 802         __le16      *pDevHandle = &io_info->devHandle;
 803         u8          *pPdInterface = &io_info->pd_interface;
 804         struct fusion_context *fusion;
 805
 806         fusion = instance->ctrl_context;
 807         *pDevHandle = cpu_to_le16(MR_DEVHANDLE_INVALID);
 808
 809         row =  mega_div64_32(stripRow, raid->rowDataSize);
 810
 811         if (raid->level == 6) {
 812                 /* logical arm within row */
 813                 u32 logArm =  mega_mod64(stripRow, raid->rowDataSize);
 814                 u32 rowMod, armQ, arm;
 815
 816                 if (raid->rowSize == 0)
 817                         return false;
 818                 /* get logical row mod */
 819                 rowMod = mega_mod64(row, raid->rowSize);
 820                 armQ = raid->rowSize-1-rowMod; /* index of Q drive */
 821                 arm = armQ+1+logArm; /* data always logically follows Q */
 822                 if (arm >= raid->rowSize) /* handle wrap condition */
 823                         arm -= raid->rowSize;
 824                 physArm = (u8)arm;
 825         } else  {
 826                 if (raid->modFactor == 0)
 827                         return false;
 828                 physArm = MR_LdDataArmGet(ld,  mega_mod64(stripRow,
 829                                                           raid->modFactor),
 830                                           map);
 831         }
 832
 833         if (raid->spanDepth == 1) {
 834                 span = 0;
 835                 *pdBlock = row << raid->stripeShift;
 836         } else {
 837                 span = (u8)MR_GetSpanBlock(ld, row, pdBlock, map);
 838                 if (span == SPAN_INVALID)
 839                         return false;
 840         }
 841
 842         /* Get the array on which this span is present */
 843         arRef       = MR_LdSpanArrayGet(ld, span, map);
 844         pd          = MR_ArPdGet(arRef, physArm, map); /* Get the pd */
 845
 846         if (pd != MR_PD_INVALID) {
 847                 /* Get dev handle from Pd. */
 848                 *pDevHandle = MR_PdDevHandleGet(pd, map);
 849                 *pPdInterface = MR_PdInterfaceTypeGet(pd, map);
 850                 /* get second pd also for raid 1/10 fast path writes*/
 851                 if ((instance->adapter_type >= VENTURA_SERIES) &&
 852                     (raid->level == 1) &&
 853                     !io_info->isRead) {
 854                         r1_alt_pd = MR_ArPdGet(arRef, physArm + 1, map);
 855                         if (r1_alt_pd != MR_PD_INVALID)
 856                                 io_info->r1_alt_dev_handle =
 857                                         MR_PdDevHandleGet(r1_alt_pd, map);
 858                 }
 859         } else {
 860                 if ((raid->level >= 5) &&
 861                         ((instance->adapter_type == THUNDERBOLT_SERIES)  ||
 862                         ((instance->adapter_type == INVADER_SERIES) &&
 863                         (raid->regTypeReqOnRead != REGION_TYPE_UNUSED))))
 864                         pRAID_Context->reg_lock_flags = REGION_TYPE_EXCLUSIVE;
 865                 else if (raid->level == 1) {
 866                         /* Get alternate Pd. */
 867                         physArm = physArm + 1;
 868                         pd = MR_ArPdGet(arRef, physArm, map);
 869                         if (pd != MR_PD_INVALID) {
 870                                 /* Get dev handle from Pd */
 871                                 *pDevHandle = MR_PdDevHandleGet(pd, map);
 872                                 *pPdInterface = MR_PdInterfaceTypeGet(pd, map);
 873                         }
 874                 }
 875         }
 876
 877         *pdBlock += stripRef + le64_to_cpu(MR_LdSpanPtrGet(ld, span, map)->startBlk);
 878         if (instance->adapter_type >= VENTURA_SERIES) {
 879                 ((struct RAID_CONTEXT_G35 *)pRAID_Context)->span_arm =
 880                                 (span << RAID_CTX_SPANARM_SPAN_SHIFT) | physArm;
 881                 io_info->span_arm =
 882                                 (span << RAID_CTX_SPANARM_SPAN_SHIFT) | physArm;
 883         } else {
 884                 pRAID_Context->span_arm =
 885                         (span << RAID_CTX_SPANARM_SPAN_SHIFT) | physArm;
 886                 io_info->span_arm = pRAID_Context->span_arm;
 887         }
 888         io_info->pd_after_lb = pd;
 889         return retval;
 890 }
 891
 892 /*
 893  * mr_get_phy_params_r56_rmw -  Calculate parameters for R56 CTIO write operation
 894  * @instance:                   Adapter soft state
 895  * @ld:                         LD index
 896  * @stripNo:                    Strip Number
 897  * @io_info:                    IO info structure pointer
 898  * pRAID_Context:               RAID context pointer
 899  * map:                         RAID map pointer
 900  *
 901  * This routine calculates the logical arm, data Arm, row number and parity arm
 902  * for R56 CTIO write operation.
 903  */
 904 static void mr_get_phy_params_r56_rmw(struct megasas_instance *instance,
 905                             u32 ld, u64 stripNo,
 906                             struct IO_REQUEST_INFO *io_info,
 907                             struct RAID_CONTEXT_G35 *pRAID_Context,
 908                             struct MR_DRV_RAID_MAP_ALL *map)
 909 {
 910         struct MR_LD_RAID  *raid = MR_LdRaidGet(ld, map);
 911         u8          span, dataArms, arms, dataArm, logArm;
 912         s8          rightmostParityArm, PParityArm;
 913         u64         rowNum;
 914         u64 *pdBlock = &io_info->pdBlock;
 915
 916         dataArms = raid->rowDataSize;
 917         arms = raid->rowSize;
 918
 919         rowNum =  mega_div64_32(stripNo, dataArms);
 920         /* parity disk arm, first arm is 0 */
 921         rightmostParityArm = (arms - 1) - mega_mod64(rowNum, arms);
 922
 923         /* logical arm within row */
 924         logArm =  mega_mod64(stripNo, dataArms);
 925         /* physical arm for data */
 926         dataArm = mega_mod64((rightmostParityArm + 1 + logArm), arms);
 927
 928         if (raid->spanDepth == 1) {
 929                 span = 0;
 930         } else {
 931                 span = (u8)MR_GetSpanBlock(ld, rowNum, pdBlock, map);
 932                 if (span == SPAN_INVALID)
 933                         return;
 934         }
 935
 936         if (raid->level == 6) {
 937                 /* P Parity arm, note this can go negative adjust if negative */
 938                 PParityArm = (arms - 2) - mega_mod64(rowNum, arms);
 939
 940                 if (PParityArm < 0)
 941                         PParityArm += arms;
 942
 943                 /* rightmostParityArm is P-Parity for RAID 5 and Q-Parity for RAID */
 944                 pRAID_Context->flow_specific.r56_arm_map = rightmostParityArm;
 945                 pRAID_Context->flow_specific.r56_arm_map |=
 946                                     (u16)(PParityArm << RAID_CTX_R56_P_ARM_SHIFT);
 947         } else {
 948                 pRAID_Context->flow_specific.r56_arm_map |=
 949                                     (u16)(rightmostParityArm << RAID_CTX_R56_P_ARM_SHIFT);
 950         }
 951
 952         pRAID_Context->reg_lock_row_lba = cpu_to_le64(rowNum);
 953         pRAID_Context->flow_specific.r56_arm_map |=
 954                                    (u16)(logArm << RAID_CTX_R56_LOG_ARM_SHIFT);
 955         cpu_to_le16s(&pRAID_Context->flow_specific.r56_arm_map);
 956         pRAID_Context->span_arm = (span << RAID_CTX_SPANARM_SPAN_SHIFT) | dataArm;
 957         pRAID_Context->raid_flags = (MR_RAID_FLAGS_IO_SUB_TYPE_R56_DIV_OFFLOAD <<
 958                                     MR_RAID_CTX_RAID_FLAGS_IO_SUB_TYPE_SHIFT);
 959
 960         return;
 961 }
 962
 963 /*
 964 ******************************************************************************
 965 *
 966 * MR_BuildRaidContext function
 967 *
 968 * This function will initiate command processing.  The start/end row and strip
 969 * information is calculated then the lock is acquired.
 970 * This function will return 0 if region lock was acquired OR return num strips
 971 */
 972 u8
 973 MR_BuildRaidContext(struct megasas_instance *instance,
 974                     struct IO_REQUEST_INFO *io_info,
 975                     struct RAID_CONTEXT *pRAID_Context,
 976                     struct MR_DRV_RAID_MAP_ALL *map, u8 **raidLUN)
 977 {
 978         struct fusion_context *fusion;
 979         struct MR_LD_RAID  *raid;
 980         u32         stripSize, stripe_mask;
 981         u64         endLba, endStrip, endRow, start_row, start_strip;
 982         u64         regStart;
 983         u32         regSize;
 984         u8          num_strips, numRows;
 985         u16         ref_in_start_stripe, ref_in_end_stripe;
 986         u64         ldStartBlock;
 987         u32         numBlocks, ldTgtId;
 988         u8          isRead;
 989         u8          retval = 0;
 990         u8          startlba_span = SPAN_INVALID;
 991         u64 *pdBlock = &io_info->pdBlock;
 992         u16         ld;
 993
 994         ldStartBlock = io_info->ldStartBlock;
 995         numBlocks = io_info->numBlocks;
 996         ldTgtId = io_info->ldTgtId;
 997         isRead = io_info->isRead;
 998         io_info->IoforUnevenSpan = 0;
 999         io_info->start_span     = SPAN_INVALID;
1000         fusion = instance->ctrl_context;
1001
1002         ld = MR_TargetIdToLdGet(ldTgtId, map);
1003         raid = MR_LdRaidGet(ld, map);
1004         /*check read ahead bit*/
1005         io_info->ra_capable = raid->capability.ra_capable;
1006
1007         /*
1008          * if rowDataSize @RAID map and spanRowDataSize @SPAN INFO are zero
1009          * return FALSE
1010          */
1011         if (raid->rowDataSize == 0) {
1012                 if (MR_LdSpanPtrGet(ld, 0, map)->spanRowDataSize == 0)
1013                         return false;
1014                 else if (instance->UnevenSpanSupport) {
1015                         io_info->IoforUnevenSpan = 1;
1016                 } else {
1017                         dev_info(&instance->pdev->dev,
1018                                 "raid->rowDataSize is 0, but has SPAN[0]"
1019                                 "rowDataSize = 0x%0x,"
1020                                 "but there is _NO_ UnevenSpanSupport\n",
1021                                 MR_LdSpanPtrGet(ld, 0, map)->spanRowDataSize);
1022                         return false;
1023                 }
1024         }
1025
1026         stripSize = 1 << raid->stripeShift;
1027         stripe_mask = stripSize-1;
1028
1029         io_info->data_arms = raid->rowDataSize;
1030
1031         /*
1032          * calculate starting row and stripe, and number of strips and rows
1033          */
1034         start_strip         = ldStartBlock >> raid->stripeShift;
1035         ref_in_start_stripe = (u16)(ldStartBlock & stripe_mask);
1036         endLba              = ldStartBlock + numBlocks - 1;
1037         ref_in_end_stripe   = (u16)(endLba & stripe_mask);
1038         endStrip            = endLba >> raid->stripeShift;
1039         num_strips          = (u8)(endStrip - start_strip + 1); /* End strip */
1040
1041         if (io_info->IoforUnevenSpan) {
1042                 start_row = get_row_from_strip(instance, ld, start_strip, map);
1043                 endRow    = get_row_from_strip(instance, ld, endStrip, map);
1044                 if (start_row == -1ULL || endRow == -1ULL) {
1045                         dev_info(&instance->pdev->dev, "return from %s %d."
1046                                 "Send IO w/o region lock.\n",
1047                                 __func__, __LINE__);
1048                         return false;
1049                 }
1050
1051                 if (raid->spanDepth == 1) {
1052                         startlba_span = 0;
1053                         *pdBlock = start_row << raid->stripeShift;
1054                 } else
1055                         startlba_span = (u8)mr_spanset_get_span_block(instance,
1056                                                 ld, start_row, pdBlock, map);
1057                 if (startlba_span == SPAN_INVALID) {
1058                         dev_info(&instance->pdev->dev, "return from %s %d"
1059                                 "for row 0x%llx,start strip %llx"
1060                                 "endSrip %llx\n", __func__, __LINE__,
1061                                 (unsigned long long)start_row,
1062                                 (unsigned long long)start_strip,
1063                                 (unsigned long long)endStrip);
1064                         return false;
1065                 }
1066                 io_info->start_span     = startlba_span;
1067                 io_info->start_row      = start_row;
1068         } else {
1069                 start_row = mega_div64_32(start_strip, raid->rowDataSize);
1070                 endRow    = mega_div64_32(endStrip, raid->rowDataSize);
1071         }
1072         numRows = (u8)(endRow - start_row + 1);
1073
1074         /*
1075          * calculate region info.
1076          */
1077
1078         /* assume region is at the start of the first row */
1079         regStart            = start_row << raid->stripeShift;
1080         /* assume this IO needs the full row - we'll adjust if not true */
1081         regSize             = stripSize;
1082
1083         io_info->do_fp_rlbypass = raid->capability.fpBypassRegionLock;
1084
1085         /* Check if we can send this I/O via FastPath */
1086         if (raid->capability.fpCapable) {
1087                 if (isRead)
1088                         io_info->fpOkForIo = (raid->capability.fpReadCapable &&
1089                                               ((num_strips == 1) ||
1090                                                raid->capability.
1091                                                fpReadAcrossStripe));
1092                 else
1093                         io_info->fpOkForIo = (raid->capability.fpWriteCapable &&
1094                                               ((num_strips == 1) ||
1095                                                raid->capability.
1096                                                fpWriteAcrossStripe));
1097         } else
1098                 io_info->fpOkForIo = false;
1099
1100         if (numRows == 1) {
1101                 /* single-strip IOs can always lock only the data needed */
1102                 if (num_strips == 1) {
1103                         regStart += ref_in_start_stripe;
1104                         regSize = numBlocks;
1105                 }
1106                 /* multi-strip IOs always need to full stripe locked */
1107         } else if (io_info->IoforUnevenSpan == 0) {
1108                 /*
1109                  * For Even span region lock optimization.
1110                  * If the start strip is the last in the start row
1111                  */
1112                 if (start_strip == (start_row + 1) * raid->rowDataSize - 1) {
1113                         regStart += ref_in_start_stripe;
1114                         /* initialize count to sectors from startref to end
1115                            of strip */
1116                         regSize = stripSize - ref_in_start_stripe;
1117                 }
1118
1119                 /* add complete rows in the middle of the transfer */
1120                 if (numRows > 2)
1121                         regSize += (numRows-2) << raid->stripeShift;
1122
1123                 /* if IO ends within first strip of last row*/
1124                 if (endStrip == endRow*raid->rowDataSize)
1125                         regSize += ref_in_end_stripe+1;
1126                 else
1127                         regSize += stripSize;
1128         } else {
1129                 /*
1130                  * For Uneven span region lock optimization.
1131                  * If the start strip is the last in the start row
1132                  */
1133                 if (start_strip == (get_strip_from_row(instance, ld, start_row, map) +
1134                                 SPAN_ROW_DATA_SIZE(map, ld, startlba_span) - 1)) {
1135                         regStart += ref_in_start_stripe;
1136                         /* initialize count to sectors from
1137                          * startRef to end of strip
1138                          */
1139                         regSize = stripSize - ref_in_start_stripe;
1140                 }
1141                 /* Add complete rows in the middle of the transfer*/
1142
1143                 if (numRows > 2)
1144                         /* Add complete rows in the middle of the transfer*/
1145                         regSize += (numRows-2) << raid->stripeShift;
1146
1147                 /* if IO ends within first strip of last row */
1148                 if (endStrip == get_strip_from_row(instance, ld, endRow, map))
1149                         regSize += ref_in_end_stripe + 1;
1150                 else
1151                         regSize += stripSize;
1152         }
1153
1154         pRAID_Context->timeout_value =
1155                 cpu_to_le16(raid->fpIoTimeoutForLd ?
1156                             raid->fpIoTimeoutForLd :
1157                             map->raidMap.fpPdIoTimeoutSec);
1158         if (instance->adapter_type == INVADER_SERIES)
1159                 pRAID_Context->reg_lock_flags = (isRead) ?
1160                         raid->regTypeReqOnRead : raid->regTypeReqOnWrite;
1161         else if (instance->adapter_type == THUNDERBOLT_SERIES)
1162                 pRAID_Context->reg_lock_flags = (isRead) ?
1163                         REGION_TYPE_SHARED_READ : raid->regTypeReqOnWrite;
1164         pRAID_Context->virtual_disk_tgt_id = raid->targetId;
1165         pRAID_Context->reg_lock_row_lba    = cpu_to_le64(regStart);
1166         pRAID_Context->reg_lock_length    = cpu_to_le32(regSize);
1167         pRAID_Context->config_seq_num   = raid->seqNum;
1168         /* save pointer to raid->LUN array */
1169         *raidLUN = raid->LUN;
1170
1171         /* Aero R5/6 Division Offload for WRITE */
1172         if (fusion->r56_div_offload && (raid->level >= 5) && !isRead) {
1173                 mr_get_phy_params_r56_rmw(instance, ld, start_strip, io_info,
1174                                        (struct RAID_CONTEXT_G35 *)pRAID_Context,
1175                                        map);
1176                 return true;
1177         }
1178
1179         /*Get Phy Params only if FP capable, or else leave it to MR firmware
1180           to do the calculation.*/
1181         if (io_info->fpOkForIo) {
1182                 retval = io_info->IoforUnevenSpan ?
1183                                 mr_spanset_get_phy_params(instance, ld,
1184                                         start_strip, ref_in_start_stripe,
1185                                         io_info, pRAID_Context, map) :
1186                                 MR_GetPhyParams(instance, ld, start_strip,
1187                                         ref_in_start_stripe, io_info,
1188                                         pRAID_Context, map);
1189                 /* If IO on an invalid Pd, then FP is not possible.*/
1190                 if (io_info->devHandle == MR_DEVHANDLE_INVALID)
1191                         io_info->fpOkForIo = false;
1192                 return retval;
1193         } else if (isRead) {
1194                 uint stripIdx;
1195                 for (stripIdx = 0; stripIdx < num_strips; stripIdx++) {
1196                         retval = io_info->IoforUnevenSpan ?
1197                                 mr_spanset_get_phy_params(instance, ld,
1198                                     start_strip + stripIdx,
1199                                     ref_in_start_stripe, io_info,
1200                                     pRAID_Context, map) :
1201                                 MR_GetPhyParams(instance, ld,
1202                                     start_strip + stripIdx, ref_in_start_stripe,
1203                                     io_info, pRAID_Context, map);
1204                         if (!retval)
1205                                 return true;
1206                 }
1207         }
1208         return true;
1209 }
1210
1211 /*
1212 ******************************************************************************
1213 *
1214 * This routine pepare spanset info from Valid Raid map and store it into
1215 * local copy of ldSpanInfo per instance data structure.
1216 *
1217 * Inputs :
1218 * map    - LD map
1219 * ldSpanInfo - ldSpanInfo per HBA instance
1220 *
1221 */
1222 void mr_update_span_set(struct MR_DRV_RAID_MAP_ALL *map,
1223         PLD_SPAN_INFO ldSpanInfo)
1224 {
1225         u8   span, count;
1226         u32  element, span_row_width;
1227         u64  span_row;
1228         struct MR_LD_RAID *raid;
1229         LD_SPAN_SET *span_set, *span_set_prev;
1230         struct MR_QUAD_ELEMENT    *quad;
1231         int ldCount;
1232         u16 ld;
1233
1234
1235         for (ldCount = 0; ldCount < MAX_LOGICAL_DRIVES_EXT; ldCount++) {
1236                 ld = MR_TargetIdToLdGet(ldCount, map);
1237                 if (ld >= (MAX_LOGICAL_DRIVES_EXT - 1))
1238                         continue;
1239                 raid = MR_LdRaidGet(ld, map);
1240                 for (element = 0; element < MAX_QUAD_DEPTH; element++) {
1241                         for (span = 0; span < raid->spanDepth; span++) {
1242                                 if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
1243                                         block_span_info.noElements) <
1244                                         element + 1)
1245                                         continue;
1246                                 span_set = &(ldSpanInfo[ld].span_set[element]);
1247                                 quad = &map->raidMap.ldSpanMap[ld].
1248                                         spanBlock[span].block_span_info.
1249                                         quad[element];
1250
1251                                 span_set->diff = le32_to_cpu(quad->diff);
1252
1253                                 for (count = 0, span_row_width = 0;
1254                                         count < raid->spanDepth; count++) {
1255                                         if (le32_to_cpu(map->raidMap.ldSpanMap[ld].
1256                                                 spanBlock[count].
1257                                                 block_span_info.
1258                                                 noElements) >= element + 1) {
1259                                                 span_set->strip_offset[count] =
1260                                                         span_row_width;
1261                                                 span_row_width +=
1262                                                         MR_LdSpanPtrGet
1263                                                         (ld, count, map)->spanRowDataSize;
1264                                         }
1265                                 }
1266
1267                                 span_set->span_row_data_width = span_row_width;
1268                                 span_row = mega_div64_32(((le64_to_cpu(quad->logEnd) -
1269                                         le64_to_cpu(quad->logStart)) + le32_to_cpu(quad->diff)),
1270                                         le32_to_cpu(quad->diff));
1271
1272                                 if (element == 0) {
1273                                         span_set->log_start_lba = 0;
1274                                         span_set->log_end_lba =
1275                                                 ((span_row << raid->stripeShift)
1276                                                 * span_row_width) - 1;
1277
1278                                         span_set->span_row_start = 0;
1279                                         span_set->span_row_end = span_row - 1;
1280
1281                                         span_set->data_strip_start = 0;
1282                                         span_set->data_strip_end =
1283                                                 (span_row * span_row_width) - 1;
1284
1285                                         span_set->data_row_start = 0;
1286                                         span_set->data_row_end =
1287                                                 (span_row * le32_to_cpu(quad->diff)) - 1;
1288                                 } else {
1289                                         span_set_prev = &(ldSpanInfo[ld].
1290                                                         span_set[element - 1]);
1291                                         span_set->log_start_lba =
1292                                                 span_set_prev->log_end_lba + 1;
1293                                         span_set->log_end_lba =
1294                                                 span_set->log_start_lba +
1295                                                 ((span_row << raid->stripeShift)
1296                                                 * span_row_width) - 1;
1297
1298                                         span_set->span_row_start =
1299                                                 span_set_prev->span_row_end + 1;
1300                                         span_set->span_row_end =
1301                                         span_set->span_row_start + span_row - 1;
1302
1303                                         span_set->data_strip_start =
1304                                         span_set_prev->data_strip_end + 1;
1305                                         span_set->data_strip_end =
1306                                                 span_set->data_strip_start +
1307                                                 (span_row * span_row_width) - 1;
1308
1309                                         span_set->data_row_start =
1310                                                 span_set_prev->data_row_end + 1;
1311                                         span_set->data_row_end =
1312                                                 span_set->data_row_start +
1313                                                 (span_row * le32_to_cpu(quad->diff)) - 1;
1314                                 }
1315                                 break;
1316                 }
1317                 if (span == raid->spanDepth)
1318                         break;
1319             }
1320         }
1321 }
1322
1323 void mr_update_load_balance_params(struct MR_DRV_RAID_MAP_ALL *drv_map,
1324         struct LD_LOAD_BALANCE_INFO *lbInfo)
1325 {
1326         int ldCount;
1327         u16 ld;
1328         struct MR_LD_RAID *raid;
1329
1330         if (lb_pending_cmds > 128 || lb_pending_cmds < 1)
1331                 lb_pending_cmds = LB_PENDING_CMDS_DEFAULT;
1332
1333         for (ldCount = 0; ldCount < MAX_LOGICAL_DRIVES_EXT; ldCount++) {
1334                 ld = MR_TargetIdToLdGet(ldCount, drv_map);
1335                 if (ld >= MAX_LOGICAL_DRIVES_EXT - 1) {
1336                         lbInfo[ldCount].loadBalanceFlag = 0;
1337                         continue;
1338                 }
1339
1340                 raid = MR_LdRaidGet(ld, drv_map);
1341                 if ((raid->level != 1) ||
1342                         (raid->ldState != MR_LD_STATE_OPTIMAL)) {
1343                         lbInfo[ldCount].loadBalanceFlag = 0;
1344                         continue;
1345                 }
1346                 lbInfo[ldCount].loadBalanceFlag = 1;
1347         }
1348 }
1349
1350 u8 megasas_get_best_arm_pd(struct megasas_instance *instance,
1351                            struct LD_LOAD_BALANCE_INFO *lbInfo,
1352                            struct IO_REQUEST_INFO *io_info,
1353                            struct MR_DRV_RAID_MAP_ALL *drv_map)
1354 {
1355         struct MR_LD_RAID  *raid;
1356         u16     pd1_dev_handle;
1357         u16     pend0, pend1, ld;
1358         u64     diff0, diff1;
1359         u8      bestArm, pd0, pd1, span, arm;
1360         u32     arRef, span_row_size;
1361
1362         u64 block = io_info->ldStartBlock;
1363         u32 count = io_info->numBlocks;
1364
1365         span = ((io_info->span_arm & RAID_CTX_SPANARM_SPAN_MASK)
1366                         >> RAID_CTX_SPANARM_SPAN_SHIFT);
1367         arm = (io_info->span_arm & RAID_CTX_SPANARM_ARM_MASK);
1368
1369         ld = MR_TargetIdToLdGet(io_info->ldTgtId, drv_map);
1370         raid = MR_LdRaidGet(ld, drv_map);
1371         span_row_size = instance->UnevenSpanSupport ?
1372                         SPAN_ROW_SIZE(drv_map, ld, span) : raid->rowSize;
1373
1374         arRef = MR_LdSpanArrayGet(ld, span, drv_map);
1375         pd0 = MR_ArPdGet(arRef, arm, drv_map);
1376         pd1 = MR_ArPdGet(arRef, (arm + 1) >= span_row_size ?
1377                 (arm + 1 - span_row_size) : arm + 1, drv_map);
1378
1379         /* Get PD1 Dev Handle */
1380
1381         pd1_dev_handle = MR_PdDevHandleGet(pd1, drv_map);
1382
1383         if (pd1_dev_handle == MR_DEVHANDLE_INVALID) {
1384                 bestArm = arm;
1385         } else {
1386                 /* get the pending cmds for the data and mirror arms */
1387                 pend0 = atomic_read(&lbInfo->scsi_pending_cmds[pd0]);
1388                 pend1 = atomic_read(&lbInfo->scsi_pending_cmds[pd1]);
1389
1390                 /* Determine the disk whose head is nearer to the req. block */
1391                 diff0 = ABS_DIFF(block, lbInfo->last_accessed_block[pd0]);
1392                 diff1 = ABS_DIFF(block, lbInfo->last_accessed_block[pd1]);
1393                 bestArm = (diff0 <= diff1 ? arm : arm ^ 1);
1394
1395                 /* Make balance count from 16 to 4 to
1396                  *  keep driver in sync with Firmware
1397                  */
1398                 if ((bestArm == arm && pend0 > pend1 + lb_pending_cmds)  ||
1399                     (bestArm != arm && pend1 > pend0 + lb_pending_cmds))
1400                         bestArm ^= 1;
1401
1402                 /* Update the last accessed block on the correct pd */
1403                 io_info->span_arm =
1404                         (span << RAID_CTX_SPANARM_SPAN_SHIFT) | bestArm;
1405                 io_info->pd_after_lb = (bestArm == arm) ? pd0 : pd1;
1406         }
1407
1408         lbInfo->last_accessed_block[io_info->pd_after_lb] = block + count - 1;
1409         return io_info->pd_after_lb;
1410 }
1411
1412 __le16 get_updated_dev_handle(struct megasas_instance *instance,
1413                               struct LD_LOAD_BALANCE_INFO *lbInfo,
1414                               struct IO_REQUEST_INFO *io_info,
1415                               struct MR_DRV_RAID_MAP_ALL *drv_map)
1416 {
1417         u8 arm_pd;
1418         __le16 devHandle;
1419
1420         /* get best new arm (PD ID) */
1421         arm_pd  = megasas_get_best_arm_pd(instance, lbInfo, io_info, drv_map);
1422         devHandle = MR_PdDevHandleGet(arm_pd, drv_map);
1423         io_info->pd_interface = MR_PdInterfaceTypeGet(arm_pd, drv_map);
1424         atomic_inc(&lbInfo->scsi_pending_cmds[arm_pd]);
1425
1426         return devHandle;
1427 }