drivers/scsi/megaraid/megaraid_sas_fp.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Linux MegaRAID driver for SAS based RAID controllers
   4  *
   5  *  Copyright (c) 2009-2013  LSI Corporation
   6  *  Copyright (c) 2013-2016  Avago Technologies
   7  *  Copyright (c) 2016-2018  Broadcom Inc.
   8  *
   9  *  FILE: megaraid_sas_fp.c
  10  *
  11  *  Authors: Broadcom Inc.
  12  *           Sumant Patro
  13  *           Varad Talamacki
  14  *           Manoj Jose
  15  *           Kashyap Desai <kashyap.desai@broadcom.com>
  16  *           Sumit Saxena <sumit.saxena@broadcom.com>
  17  *
  18  *  Send feedback to: megaraidlinux.pdl@broadcom.com
  19  */
  20
  21 #include <linux/kernel.h>
  22 #include <linux/types.h>
  23 #include <linux/pci.h>
  24 #include <linux/list.h>
  25 #include <linux/moduleparam.h>
  26 #include <linux/module.h>
  27 #include <linux/spinlock.h>
  28 #include <linux/interrupt.h>
  29 #include <linux/delay.h>
  30 #include <linux/uio.h>
  31 #include <linux/uaccess.h>
  32 #include <linux/fs.h>
  33 #include <linux/compat.h>
  34 #include <linux/blkdev.h>
  35 #include <linux/poll.h>
  36 #include <linux/irq_poll.h>
  37
  38 #include <scsi/scsi.h>
  39 #include <scsi/scsi_cmnd.h>
  40 #include <scsi/scsi_device.h>
  41 #include <scsi/scsi_host.h>
  42
  43 #include "megaraid_sas_fusion.h"
  44 #include "megaraid_sas.h"
  45 #include <asm/div64.h>
  46
  47 #define LB_PENDING_CMDS_DEFAULT 4
  48 static unsigned int lb_pending_cmds = LB_PENDING_CMDS_DEFAULT;
  49 module_param(lb_pending_cmds, int, 0444);
  50 MODULE_PARM_DESC(lb_pending_cmds, "Change raid-1 load balancing outstanding "
  51         "threshold. Valid Values are 1-128. Default: 4");
  52
  53
  54 #define ABS_DIFF(a, b)   (((a) > (b)) ? ((a) - (b)) : ((b) - (a)))
  55 #define MR_LD_STATE_OPTIMAL 3
  56
  57 #define SPAN_ROW_SIZE(map, ld, index_) (MR_LdSpanPtrGet(ld, index_, map)->spanRowSize)
  58 #define SPAN_ROW_DATA_SIZE(map_, ld, index_)   (MR_LdSpanPtrGet(ld, index_, map)->spanRowDataSize)
  59 #define SPAN_INVALID  0xff
  60
  61 /* Prototypes */
  62 static void mr_update_span_set(struct MR_DRV_RAID_MAP_ALL *map,
  63         PLD_SPAN_INFO ldSpanInfo);
  64 static u8 mr_spanset_get_phy_params(struct megasas_instance *instance, u32 ld,
  65         u64 stripRow, u16 stripRef, struct IO_REQUEST_INFO *io_info,
  66         struct RAID_CONTEXT *pRAID_Context, struct MR_DRV_RAID_MAP_ALL *map);
  67 static u64 get_row_from_strip(struct megasas_instance *instance, u32 ld,
  68         u64 strip, struct MR_DRV_RAID_MAP_ALL *map);
  69
  70 u32 mega_mod64(u64 dividend, u32 divisor)
  71 {
  72         u64 d;
  73         u32 remainder;
  74
  75         if (!divisor)
  76                 printk(KERN_ERR "megasas : DIVISOR is zero, in div fn\n");
  77         d = dividend;
  78         remainder = do_div(d, divisor);
  79         return remainder;
  80 }
  81
  82 /**
  83  * mega_div64_32 - Do a 64-bit division
  84  * @dividend:   Dividend
  85  * @divisor:    Divisor
  86  *
  87  * @return quotient
  88  **/
  89 static u64 mega_div64_32(uint64_t dividend, uint32_t divisor)
  90 {
  91         u64 d = dividend;
  92
  93         if (!divisor)
  94                 printk(KERN_ERR "megasas : DIVISOR is zero in mod fn\n");
  95
  96         do_div(d, divisor);
  97
  98         return d;
  99 }
 100
 101 struct MR_LD_RAID *MR_LdRaidGet(u32 ld, struct MR_DRV_RAID_MAP_ALL *map)
 102 {
 103         return &map->raidMap.ldSpanMap[ld].ldRaid;
 104 }
 105
 106 static struct MR_SPAN_BLOCK_INFO *MR_LdSpanInfoGet(u32 ld,
 107                                                    struct MR_DRV_RAID_MAP_ALL
 108                                                    *map)
 109 {
 110         return &map->raidMap.ldSpanMap[ld].spanBlock[0];
 111 }
 112
 113 static u8 MR_LdDataArmGet(u32 ld, u32 armIdx, struct MR_DRV_RAID_MAP_ALL *map)
 114 {
 115         return map->raidMap.ldSpanMap[ld].dataArmMap[armIdx];
 116 }
 117
 118 u16 MR_ArPdGet(u32 ar, u32 arm, struct MR_DRV_RAID_MAP_ALL *map)
 119 {
 120         return le16_to_cpu(map->raidMap.arMapInfo[ar].pd[arm]);
 121 }
 122
 123 u16 MR_LdSpanArrayGet(u32 ld, u32 span, struct MR_DRV_RAID_MAP_ALL *map)
 124 {
 125         return le16_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].span.arrayRef);
 126 }
 127
 128 __le16 MR_PdDevHandleGet(u32 pd, struct MR_DRV_RAID_MAP_ALL *map)
 129 {
 130         return map->raidMap.devHndlInfo[pd].curDevHdl;
 131 }
 132
 133 static u8 MR_PdInterfaceTypeGet(u32 pd, struct MR_DRV_RAID_MAP_ALL *map)
 134 {
 135         return map->raidMap.devHndlInfo[pd].interfaceType;
 136 }
 137
 138 u16 MR_GetLDTgtId(u32 ld, struct MR_DRV_RAID_MAP_ALL *map)
 139 {
 140         return le16_to_cpu(map->raidMap.ldSpanMap[ld].ldRaid.targetId);
 141 }
 142
 143 u16 MR_TargetIdToLdGet(u32 ldTgtId, struct MR_DRV_RAID_MAP_ALL *map)
 144 {
 145         return map->raidMap.ldTgtIdToLd[ldTgtId];
 146 }
 147
 148 static struct MR_LD_SPAN *MR_LdSpanPtrGet(u32 ld, u32 span,
 149                                           struct MR_DRV_RAID_MAP_ALL *map)
 150 {
 151         return &map->raidMap.ldSpanMap[ld].spanBlock[span].span;
 152 }
 153
 154 /*
 155  * This function will Populate Driver Map using firmware raid map
 156  */
 157 static int MR_PopulateDrvRaidMap(struct megasas_instance *instance, u64 map_id)
 158 {
 159         struct fusion_context *fusion = instance->ctrl_context;
 160         struct MR_FW_RAID_MAP_ALL     *fw_map_old    = NULL;
 161         struct MR_FW_RAID_MAP         *pFwRaidMap    = NULL;
 162         int i, j;
 163         u16 ld_count;
 164         struct MR_FW_RAID_MAP_DYNAMIC *fw_map_dyn;
 165         struct MR_FW_RAID_MAP_EXT *fw_map_ext;
 166         struct MR_RAID_MAP_DESC_TABLE *desc_table;
 167
 168
 169         struct MR_DRV_RAID_MAP_ALL *drv_map =
 170                         fusion->ld_drv_map[(map_id & 1)];
 171         struct MR_DRV_RAID_MAP *pDrvRaidMap = &drv_map->raidMap;
 172         void *raid_map_data = NULL;
 173
 174         memset(drv_map, 0, fusion->drv_map_sz);
 175         memset(pDrvRaidMap->ldTgtIdToLd,
 176                0xff, (sizeof(u16) * MAX_LOGICAL_DRIVES_DYN));
 177
 178         if (instance->max_raid_mapsize) {
 179                 fw_map_dyn = fusion->ld_map[(map_id & 1)];
 180                 desc_table =
 181                 (struct MR_RAID_MAP_DESC_TABLE *)((void *)fw_map_dyn + le32_to_cpu(fw_map_dyn->desc_table_offset));
 182                 if (desc_table != fw_map_dyn->raid_map_desc_table)
 183                         dev_dbg(&instance->pdev->dev, "offsets of desc table are not matching desc %p original %p\n",
 184                                 desc_table, fw_map_dyn->raid_map_desc_table);
 185
 186                 ld_count = (u16)le16_to_cpu(fw_map_dyn->ld_count);
 187                 pDrvRaidMap->ldCount = (__le16)cpu_to_le16(ld_count);
 188                 pDrvRaidMap->fpPdIoTimeoutSec =
 189                         fw_map_dyn->fp_pd_io_timeout_sec;
 190                 pDrvRaidMap->totalSize =
 191                         cpu_to_le32(sizeof(struct MR_DRV_RAID_MAP_ALL));
 192                 /* point to actual data starting point*/
 193                 raid_map_data = (void *)fw_map_dyn +
 194                         le32_to_cpu(fw_map_dyn->desc_table_offset) +
 195                         le32_to_cpu(fw_map_dyn->desc_table_size);
 196
 197                 for (i = 0; i < le32_to_cpu(fw_map_dyn->desc_table_num_elements); ++i) {
 198                         switch (le32_to_cpu(desc_table->raid_map_desc_type)) {
 199                         case RAID_MAP_DESC_TYPE_DEVHDL_INFO:
 200                                 fw_map_dyn->dev_hndl_info =
 201                                 (struct MR_DEV_HANDLE_INFO *)(raid_map_data + le32_to_cpu(desc_table->raid_map_desc_offset));
 202                                 memcpy(pDrvRaidMap->devHndlInfo,
 203                                         fw_map_dyn->dev_hndl_info,
 204                                         sizeof(struct MR_DEV_HANDLE_INFO) *
 205                                         le32_to_cpu(desc_table->raid_map_desc_elements));
 206                         break;
 207                         case RAID_MAP_DESC_TYPE_TGTID_INFO:
 208                                 fw_map_dyn->ld_tgt_id_to_ld =
 209                                         (u16 *)(raid_map_data +
 210                                         le32_to_cpu(desc_table->raid_map_desc_offset));
 211                                 for (j = 0; j < le32_to_cpu(desc_table->raid_map_desc_elements); j++) {
 212                                         pDrvRaidMap->ldTgtIdToLd[j] =
 213                                                 le16_to_cpu(fw_map_dyn->ld_tgt_id_to_ld[j]);
 214                                 }
 215                         break;
 216                         case RAID_MAP_DESC_TYPE_ARRAY_INFO:
 217                                 fw_map_dyn->ar_map_info =
 218                                         (struct MR_ARRAY_INFO *)
 219                                         (raid_map_data + le32_to_cpu(desc_table->raid_map_desc_offset));
 220                                 memcpy(pDrvRaidMap->arMapInfo,
 221                                        fw_map_dyn->ar_map_info,
 222                                        sizeof(struct MR_ARRAY_INFO) *
 223                                        le32_to_cpu(desc_table->raid_map_desc_elements));
 224                         break;
 225                         case RAID_MAP_DESC_TYPE_SPAN_INFO:
 226                                 fw_map_dyn->ld_span_map =
 227                                         (struct MR_LD_SPAN_MAP *)
 228                                         (raid_map_data +
 229                                         le32_to_cpu(desc_table->raid_map_desc_offset));
 230                                 memcpy(pDrvRaidMap->ldSpanMap,
 231                                        fw_map_dyn->ld_span_map,
 232                                        sizeof(struct MR_LD_SPAN_MAP) *
 233                                        le32_to_cpu(desc_table->raid_map_desc_elements));
 234                         break;
 235                         default:
 236                                 dev_dbg(&instance->pdev->dev, "wrong number of desctableElements %d\n",
 237                                         fw_map_dyn->desc_table_num_elements);
 238                         }
 239                         ++desc_table;
 240                 }
 241
 242         } else if (instance->supportmax256vd) {
 243                 fw_map_ext =
 244                         (struct MR_FW_RAID_MAP_EXT *)fusion->ld_map[(map_id & 1)];
 245                 ld_count = (u16)le16_to_cpu(fw_map_ext->ldCount);
 246                 if (ld_count > MAX_LOGICAL_DRIVES_EXT) {
 247                         dev_dbg(&instance->pdev->dev, "megaraid_sas: LD count exposed in RAID map in not valid\n");
 248                         return 1;
 249                 }
 250
 251                 pDrvRaidMap->ldCount = (__le16)cpu_to_le16(ld_count);
 252                 pDrvRaidMap->fpPdIoTimeoutSec = fw_map_ext->fpPdIoTimeoutSec;
 253                 for (i = 0; i < (MAX_LOGICAL_DRIVES_EXT); i++)
 254                         pDrvRaidMap->ldTgtIdToLd[i] =
 255                                 (u16)fw_map_ext->ldTgtIdToLd[i];
 256                 memcpy(pDrvRaidMap->ldSpanMap, fw_map_ext->ldSpanMap,
 257                        sizeof(struct MR_LD_SPAN_MAP) * ld_count);
 258                 memcpy(pDrvRaidMap->arMapInfo, fw_map_ext->arMapInfo,
 259                        sizeof(struct MR_ARRAY_INFO) * MAX_API_ARRAYS_EXT);
 260                 memcpy(pDrvRaidMap->devHndlInfo, fw_map_ext->devHndlInfo,
 261                        sizeof(struct MR_DEV_HANDLE_INFO) *
 262                        MAX_RAIDMAP_PHYSICAL_DEVICES);
 263
 264                 /* New Raid map will not set totalSize, so keep expected value
 265                  * for legacy code in ValidateMapInfo
 266                  */
 267                 pDrvRaidMap->totalSize =
 268                         cpu_to_le32(sizeof(struct MR_FW_RAID_MAP_EXT));
 269         } else {
 270                 fw_map_old = (struct MR_FW_RAID_MAP_ALL *)
 271                                 fusion->ld_map[(map_id & 1)];
 272                 pFwRaidMap = &fw_map_old->raidMap;
 273                 ld_count = (u16)le32_to_cpu(pFwRaidMap->ldCount);
 274                 if (ld_count > MAX_LOGICAL_DRIVES) {
 275                         dev_dbg(&instance->pdev->dev,
 276                                 "LD count exposed in RAID map in not valid\n");
 277                         return 1;
 278                 }
 279
 280                 pDrvRaidMap->totalSize = pFwRaidMap->totalSize;
 281                 pDrvRaidMap->ldCount = (__le16)cpu_to_le16(ld_count);
 282                 pDrvRaidMap->fpPdIoTimeoutSec = pFwRaidMap->fpPdIoTimeoutSec;
 283                 for (i = 0; i < MAX_RAIDMAP_LOGICAL_DRIVES + MAX_RAIDMAP_VIEWS; i++)
 284                         pDrvRaidMap->ldTgtIdToLd[i] =
 285                                 (u8)pFwRaidMap->ldTgtIdToLd[i];
 286                 for (i = 0; i < ld_count; i++) {
 287                         pDrvRaidMap->ldSpanMap[i] = pFwRaidMap->ldSpanMap[i];
 288                 }
 289                 memcpy(pDrvRaidMap->arMapInfo, pFwRaidMap->arMapInfo,
 290                         sizeof(struct MR_ARRAY_INFO) * MAX_RAIDMAP_ARRAYS);
 291                 memcpy(pDrvRaidMap->devHndlInfo, pFwRaidMap->devHndlInfo,
 292                         sizeof(struct MR_DEV_HANDLE_INFO) *
 293                         MAX_RAIDMAP_PHYSICAL_DEVICES);
 294         }
 295
 296         return 0;
 297 }
 298
 299 /*
 300  * This function will validate Map info data provided by FW
 301  */
 302 u8 MR_ValidateMapInfo(struct megasas_instance *instance, u64 map_id)
 303 {
 304         struct fusion_context *fusion;
 305         struct MR_DRV_RAID_MAP_ALL *drv_map;
 306         struct MR_DRV_RAID_MAP *pDrvRaidMap;
 307         struct LD_LOAD_BALANCE_INFO *lbInfo;
 308         PLD_SPAN_INFO ldSpanInfo;
 309         struct MR_LD_RAID         *raid;
 310         u16 num_lds, i;
 311         u16 ld;
 312         u32 expected_size;
 313
 314         if (MR_PopulateDrvRaidMap(instance, map_id))
 315                 return 0;
 316
 317         fusion = instance->ctrl_context;
 318         drv_map = fusion->ld_drv_map[(map_id & 1)];
 319         pDrvRaidMap = &drv_map->raidMap;
 320
 321         lbInfo = fusion->load_balance_info;
 322         ldSpanInfo = fusion->log_to_span;
 323
 324         if (instance->max_raid_mapsize)
 325                 expected_size = sizeof(struct MR_DRV_RAID_MAP_ALL);
 326         else if (instance->supportmax256vd)
 327                 expected_size = sizeof(struct MR_FW_RAID_MAP_EXT);
 328         else
 329                 expected_size =
 330                         (sizeof(struct MR_FW_RAID_MAP) - sizeof(struct MR_LD_SPAN_MAP) +
 331                         (sizeof(struct MR_LD_SPAN_MAP) * le16_to_cpu(pDrvRaidMap->ldCount)));
 332
 333         if (le32_to_cpu(pDrvRaidMap->totalSize) != expected_size) {
 334                 dev_dbg(&instance->pdev->dev, "megasas: map info structure size 0x%x",
 335                         le32_to_cpu(pDrvRaidMap->totalSize));
 336                 dev_dbg(&instance->pdev->dev, "is not matching expected size 0x%x\n",
 337                         (unsigned int)expected_size);
 338                 dev_err(&instance->pdev->dev, "megasas: span map %x, pDrvRaidMap->totalSize : %x\n",
 339                         (unsigned int)sizeof(struct MR_LD_SPAN_MAP),
 340                         le32_to_cpu(pDrvRaidMap->totalSize));
 341                 return 0;
 342         }
 343
 344         if (instance->UnevenSpanSupport)
 345                 mr_update_span_set(drv_map, ldSpanInfo);
 346
 347         if (lbInfo)
 348                 mr_update_load_balance_params(drv_map, lbInfo);
 349
 350         num_lds = le16_to_cpu(drv_map->raidMap.ldCount);
 351
 352         memcpy(instance->ld_ids_prev,
 353                instance->ld_ids_from_raidmap,
 354                sizeof(instance->ld_ids_from_raidmap));
 355         memset(instance->ld_ids_from_raidmap, 0xff, MEGASAS_MAX_LD_IDS);
 356         /*Convert Raid capability values to CPU arch */
 357         for (i = 0; (num_lds > 0) && (i < MAX_LOGICAL_DRIVES_EXT); i++) {
 358                 ld = MR_TargetIdToLdGet(i, drv_map);
 359
 360                 /* For non existing VDs, iterate to next VD*/
 361                 if (ld >= (MAX_LOGICAL_DRIVES_EXT - 1))
 362                         continue;
 363
 364                 raid = MR_LdRaidGet(ld, drv_map);
 365                 le32_to_cpus((u32 *)&raid->capability);
 366                 instance->ld_ids_from_raidmap[i] = i;
 367                 num_lds--;
 368         }
 369
 370         return 1;
 371 }
 372
 373 static u32 MR_GetSpanBlock(u32 ld, u64 row, u64 *span_blk,
 374                     struct MR_DRV_RAID_MAP_ALL *map)
 375 {
 376         struct MR_SPAN_BLOCK_INFO *pSpanBlock = MR_LdSpanInfoGet(ld, map);
 377         struct MR_QUAD_ELEMENT    *quad;
 378         struct MR_LD_RAID         *raid = MR_LdRaidGet(ld, map);
 379         u32                span, j;
 380
 381         for (span = 0; span < raid->spanDepth; span++, pSpanBlock++) {
 382
 383                 for (j = 0; j < le32_to_cpu(pSpanBlock->block_span_info.noElements); j++) {
 384                         quad = &pSpanBlock->block_span_info.quad[j];
 385
 386                         if (le32_to_cpu(quad->diff) == 0)
 387                                 return SPAN_INVALID;
 388                         if (le64_to_cpu(quad->logStart) <= row && row <=
 389                                 le64_to_cpu(quad->logEnd) && (mega_mod64(row - le64_to_cpu(quad->logStart),
 390                                 le32_to_cpu(quad->diff))) == 0) {
 391                                 if (span_blk != NULL) {
 392                                         u64  blk;
 393                                         blk =  mega_div64_32((row-le64_to_cpu(quad->logStart)), le32_to_cpu(quad->diff));
 394
 395                                         blk = (blk + le64_to_cpu(quad->offsetInSpan)) << raid->stripeShift;
 396                                         *span_blk = blk;
 397                                 }
 398                                 return span;
 399                         }
 400                 }
 401         }
 402         return SPAN_INVALID;
 403 }
 404
 405 /*
 406 ******************************************************************************
 407 *
 408 * This routine calculates the Span block for given row using spanset.
 409 *
 410 * Inputs :
 411 *    instance - HBA instance
 412 *    ld   - Logical drive number
 413 *    row        - Row number
 414 *    map    - LD map
 415 *
 416 * Outputs :
 417 *
 418 *    span          - Span number
 419 *    block         - Absolute Block number in the physical disk
 420 *    div_error     - Devide error code.
 421 */
 422
 423 static u32 mr_spanset_get_span_block(struct megasas_instance *instance,
 424                 u32 ld, u64 row, u64 *span_blk, struct MR_DRV_RAID_MAP_ALL *map)
 425 {
 426         struct fusion_context *fusion = instance->ctrl_context;
 427         struct MR_LD_RAID         *raid = MR_LdRaidGet(ld, map);
 428         LD_SPAN_SET *span_set;
 429         struct MR_QUAD_ELEMENT    *quad;
 430         u32    span, info;
 431         PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span;
 432
 433         for (info = 0; info < MAX_QUAD_DEPTH; info++) {
 434                 span_set = &(ldSpanInfo[ld].span_set[info]);
 435
 436                 if (span_set->span_row_data_width == 0)
 437                         break;
 438
 439                 if (row > span_set->data_row_end)
 440                         continue;
 441
 442                 for (span = 0; span < raid->spanDepth; span++)
 443                         if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
 444                                 block_span_info.noElements) >= info+1) {
 445                                 quad = &map->raidMap.ldSpanMap[ld].
 446                                         spanBlock[span].
 447                                         block_span_info.quad[info];
 448                                 if (le32_to_cpu(quad->diff) == 0)
 449                                         return SPAN_INVALID;
 450                                 if (le64_to_cpu(quad->logStart) <= row  &&
 451                                         row <= le64_to_cpu(quad->logEnd)  &&
 452                                         (mega_mod64(row - le64_to_cpu(quad->logStart),
 453                                                 le32_to_cpu(quad->diff))) == 0) {
 454                                         if (span_blk != NULL) {
 455                                                 u64  blk;
 456                                                 blk = mega_div64_32
 457                                                     ((row - le64_to_cpu(quad->logStart)),
 458                                                     le32_to_cpu(quad->diff));
 459                                                 blk = (blk + le64_to_cpu(quad->offsetInSpan))
 460                                                          << raid->stripeShift;
 461                                                 *span_blk = blk;
 462                                         }
 463                                         return span;
 464                                 }
 465                         }
 466         }
 467         return SPAN_INVALID;
 468 }
 469
 470 /*
 471 ******************************************************************************
 472 *
 473 * This routine calculates the row for given strip using spanset.
 474 *
 475 * Inputs :
 476 *    instance - HBA instance
 477 *    ld   - Logical drive number
 478 *    Strip        - Strip
 479 *    map    - LD map
 480 *
 481 * Outputs :
 482 *
 483 *    row         - row associated with strip
 484 */
 485
 486 static u64  get_row_from_strip(struct megasas_instance *instance,
 487         u32 ld, u64 strip, struct MR_DRV_RAID_MAP_ALL *map)
 488 {
 489         struct fusion_context *fusion = instance->ctrl_context;
 490         struct MR_LD_RAID       *raid = MR_LdRaidGet(ld, map);
 491         LD_SPAN_SET     *span_set;
 492         PLD_SPAN_INFO   ldSpanInfo = fusion->log_to_span;
 493         u32             info, strip_offset, span, span_offset;
 494         u64             span_set_Strip, span_set_Row, retval;
 495
 496         for (info = 0; info < MAX_QUAD_DEPTH; info++) {
 497                 span_set = &(ldSpanInfo[ld].span_set[info]);
 498
 499                 if (span_set->span_row_data_width == 0)
 500                         break;
 501                 if (strip > span_set->data_strip_end)
 502                         continue;
 503
 504                 span_set_Strip = strip - span_set->data_strip_start;
 505                 strip_offset = mega_mod64(span_set_Strip,
 506                                 span_set->span_row_data_width);
 507                 span_set_Row = mega_div64_32(span_set_Strip,
 508                                 span_set->span_row_data_width) * span_set->diff;
 509                 for (span = 0, span_offset = 0; span < raid->spanDepth; span++)
 510                         if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
 511                                 block_span_info.noElements) >= info+1) {
 512                                 if (strip_offset >=
 513                                         span_set->strip_offset[span])
 514                                         span_offset++;
 515                                 else
 516                                         break;
 517                         }
 518
 519                 retval = (span_set->data_row_start + span_set_Row +
 520                                 (span_offset - 1));
 521                 return retval;
 522         }
 523         return -1LLU;
 524 }
 525
 526
 527 /*
 528 ******************************************************************************
 529 *
 530 * This routine calculates the Start Strip for given row using spanset.
 531 *
 532 * Inputs :
 533 *    instance - HBA instance
 534 *    ld   - Logical drive number
 535 *    row        - Row number
 536 *    map    - LD map
 537 *
 538 * Outputs :
 539 *
 540 *    Strip         - Start strip associated with row
 541 */
 542
 543 static u64 get_strip_from_row(struct megasas_instance *instance,
 544                 u32 ld, u64 row, struct MR_DRV_RAID_MAP_ALL *map)
 545 {
 546         struct fusion_context *fusion = instance->ctrl_context;
 547         struct MR_LD_RAID         *raid = MR_LdRaidGet(ld, map);
 548         LD_SPAN_SET *span_set;
 549         struct MR_QUAD_ELEMENT    *quad;
 550         PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span;
 551         u32    span, info;
 552         u64  strip;
 553
 554         for (info = 0; info < MAX_QUAD_DEPTH; info++) {
 555                 span_set = &(ldSpanInfo[ld].span_set[info]);
 556
 557                 if (span_set->span_row_data_width == 0)
 558                         break;
 559                 if (row > span_set->data_row_end)
 560                         continue;
 561
 562                 for (span = 0; span < raid->spanDepth; span++)
 563                         if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
 564                                 block_span_info.noElements) >= info+1) {
 565                                 quad = &map->raidMap.ldSpanMap[ld].
 566                                         spanBlock[span].block_span_info.quad[info];
 567                                 if (le64_to_cpu(quad->logStart) <= row  &&
 568                                         row <= le64_to_cpu(quad->logEnd)  &&
 569                                         mega_mod64((row - le64_to_cpu(quad->logStart)),
 570                                         le32_to_cpu(quad->diff)) == 0) {
 571                                         strip = mega_div64_32
 572                                                 (((row - span_set->data_row_start)
 573                                                         - le64_to_cpu(quad->logStart)),
 574                                                         le32_to_cpu(quad->diff));
 575                                         strip *= span_set->span_row_data_width;
 576                                         strip += span_set->data_strip_start;
 577                                         strip += span_set->strip_offset[span];
 578                                         return strip;
 579                                 }
 580                         }
 581         }
 582         dev_err(&instance->pdev->dev, "get_strip_from_row"
 583                 "returns invalid strip for ld=%x, row=%lx\n",
 584                 ld, (long unsigned int)row);
 585         return -1;
 586 }
 587
 588 /*
 589 ******************************************************************************
 590 *
 591 * This routine calculates the Physical Arm for given strip using spanset.
 592 *
 593 * Inputs :
 594 *    instance - HBA instance
 595 *    ld   - Logical drive number
 596 *    strip      - Strip
 597 *    map    - LD map
 598 *
 599 * Outputs :
 600 *
 601 *    Phys Arm         - Phys Arm associated with strip
 602 */
 603
 604 static u32 get_arm_from_strip(struct megasas_instance *instance,
 605         u32 ld, u64 strip, struct MR_DRV_RAID_MAP_ALL *map)
 606 {
 607         struct fusion_context *fusion = instance->ctrl_context;
 608         struct MR_LD_RAID         *raid = MR_LdRaidGet(ld, map);
 609         LD_SPAN_SET *span_set;
 610         PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span;
 611         u32    info, strip_offset, span, span_offset, retval;
 612
 613         for (info = 0 ; info < MAX_QUAD_DEPTH; info++) {
 614                 span_set = &(ldSpanInfo[ld].span_set[info]);
 615
 616                 if (span_set->span_row_data_width == 0)
 617                         break;
 618                 if (strip > span_set->data_strip_end)
 619                         continue;
 620
 621                 strip_offset = (uint)mega_mod64
 622                                 ((strip - span_set->data_strip_start),
 623                                 span_set->span_row_data_width);
 624
 625                 for (span = 0, span_offset = 0; span < raid->spanDepth; span++)
 626                         if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
 627                                 block_span_info.noElements) >= info+1) {
 628                                 if (strip_offset >=
 629                                         span_set->strip_offset[span])
 630                                         span_offset =
 631                                                 span_set->strip_offset[span];
 632                                 else
 633                                         break;
 634                         }
 635
 636                 retval = (strip_offset - span_offset);
 637                 return retval;
 638         }
 639
 640         dev_err(&instance->pdev->dev, "get_arm_from_strip"
 641                 "returns invalid arm for ld=%x strip=%lx\n",
 642                 ld, (long unsigned int)strip);
 643
 644         return -1;
 645 }
 646
 647 /* This Function will return Phys arm */
 648 static u8 get_arm(struct megasas_instance *instance, u32 ld, u8 span, u64 stripe,
 649                 struct MR_DRV_RAID_MAP_ALL *map)
 650 {
 651         struct MR_LD_RAID  *raid = MR_LdRaidGet(ld, map);
 652         /* Need to check correct default value */
 653         u32    arm = 0;
 654
 655         switch (raid->level) {
 656         case 0:
 657         case 5:
 658         case 6:
 659                 arm = mega_mod64(stripe, SPAN_ROW_SIZE(map, ld, span));
 660                 break;
 661         case 1:
 662                 /* start with logical arm */
 663                 arm = get_arm_from_strip(instance, ld, stripe, map);
 664                 if (arm != -1U)
 665                         arm *= 2;
 666                 break;
 667         }
 668
 669         return arm;
 670 }
 671
 672
 673 /*
 674 ******************************************************************************
 675 *
 676 * This routine calculates the arm, span and block for the specified stripe and
 677 * reference in stripe using spanset
 678 *
 679 * Inputs :
 680 *
 681 *    ld   - Logical drive number
 682 *    stripRow        - Stripe number
 683 *    stripRef    - Reference in stripe
 684 *
 685 * Outputs :
 686 *
 687 *    span          - Span number
 688 *    block         - Absolute Block number in the physical disk
 689 */
 690 static u8 mr_spanset_get_phy_params(struct megasas_instance *instance, u32 ld,
 691                 u64 stripRow, u16 stripRef, struct IO_REQUEST_INFO *io_info,
 692                 struct RAID_CONTEXT *pRAID_Context,
 693                 struct MR_DRV_RAID_MAP_ALL *map)
 694 {
 695         struct MR_LD_RAID  *raid = MR_LdRaidGet(ld, map);
 696         u32     pd, arRef, r1_alt_pd;
 697         u8      physArm, span;
 698         u64     row;
 699         u8      retval = true;
 700         u64     *pdBlock = &io_info->pdBlock;
 701         __le16  *pDevHandle = &io_info->devHandle;
 702         u8      *pPdInterface = &io_info->pd_interface;
 703         u32     logArm, rowMod, armQ, arm;
 704
 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 static 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
 805         *pDevHandle = cpu_to_le16(MR_DEVHANDLE_INVALID);
 806
 807         row =  mega_div64_32(stripRow, raid->rowDataSize);
 808
 809         if (raid->level == 6) {
 810                 /* logical arm within row */
 811                 u32 logArm =  mega_mod64(stripRow, raid->rowDataSize);
 812                 u32 rowMod, armQ, arm;
 813
 814                 if (raid->rowSize == 0)
 815                         return false;
 816                 /* get logical row mod */
 817                 rowMod = mega_mod64(row, raid->rowSize);
 818                 armQ = raid->rowSize-1-rowMod; /* index of Q drive */
 819                 arm = armQ+1+logArm; /* data always logically follows Q */
 820                 if (arm >= raid->rowSize) /* handle wrap condition */
 821                         arm -= raid->rowSize;
 822                 physArm = (u8)arm;
 823         } else  {
 824                 if (raid->modFactor == 0)
 825                         return false;
 826                 physArm = MR_LdDataArmGet(ld,  mega_mod64(stripRow,
 827                                                           raid->modFactor),
 828                                           map);
 829         }
 830
 831         if (raid->spanDepth == 1) {
 832                 span = 0;
 833                 *pdBlock = row << raid->stripeShift;
 834         } else {
 835                 span = (u8)MR_GetSpanBlock(ld, row, pdBlock, map);
 836                 if (span == SPAN_INVALID)
 837                         return false;
 838         }
 839
 840         /* Get the array on which this span is present */
 841         arRef       = MR_LdSpanArrayGet(ld, span, map);
 842         pd          = MR_ArPdGet(arRef, physArm, map); /* Get the pd */
 843
 844         if (pd != MR_PD_INVALID) {
 845                 /* Get dev handle from Pd. */
 846                 *pDevHandle = MR_PdDevHandleGet(pd, map);
 847                 *pPdInterface = MR_PdInterfaceTypeGet(pd, map);
 848                 /* get second pd also for raid 1/10 fast path writes*/
 849                 if ((instance->adapter_type >= VENTURA_SERIES) &&
 850                     (raid->level == 1) &&
 851                     !io_info->isRead) {
 852                         r1_alt_pd = MR_ArPdGet(arRef, physArm + 1, map);
 853                         if (r1_alt_pd != MR_PD_INVALID)
 854                                 io_info->r1_alt_dev_handle =
 855                                         MR_PdDevHandleGet(r1_alt_pd, map);
 856                 }
 857         } else {
 858                 if ((raid->level >= 5) &&
 859                         ((instance->adapter_type == THUNDERBOLT_SERIES)  ||
 860                         ((instance->adapter_type == INVADER_SERIES) &&
 861                         (raid->regTypeReqOnRead != REGION_TYPE_UNUSED))))
 862                         pRAID_Context->reg_lock_flags = REGION_TYPE_EXCLUSIVE;
 863                 else if (raid->level == 1) {
 864                         /* Get alternate Pd. */
 865                         physArm = physArm + 1;
 866                         pd = MR_ArPdGet(arRef, physArm, map);
 867                         if (pd != MR_PD_INVALID) {
 868                                 /* Get dev handle from Pd */
 869                                 *pDevHandle = MR_PdDevHandleGet(pd, map);
 870                                 *pPdInterface = MR_PdInterfaceTypeGet(pd, map);
 871                         }
 872                 }
 873         }
 874
 875         *pdBlock += stripRef + le64_to_cpu(MR_LdSpanPtrGet(ld, span, map)->startBlk);
 876         if (instance->adapter_type >= VENTURA_SERIES) {
 877                 ((struct RAID_CONTEXT_G35 *)pRAID_Context)->span_arm =
 878                                 (span << RAID_CTX_SPANARM_SPAN_SHIFT) | physArm;
 879                 io_info->span_arm =
 880                                 (span << RAID_CTX_SPANARM_SPAN_SHIFT) | physArm;
 881         } else {
 882                 pRAID_Context->span_arm =
 883                         (span << RAID_CTX_SPANARM_SPAN_SHIFT) | physArm;
 884                 io_info->span_arm = pRAID_Context->span_arm;
 885         }
 886         io_info->pd_after_lb = pd;
 887         return retval;
 888 }
 889
 890 /*
 891  * mr_get_phy_params_r56_rmw -  Calculate parameters for R56 CTIO write operation
 892  * @instance:                   Adapter soft state
 893  * @ld:                         LD index
 894  * @stripNo:                    Strip Number
 895  * @io_info:                    IO info structure pointer
 896  * pRAID_Context:               RAID context pointer
 897  * map:                         RAID map pointer
 898  *
 899  * This routine calculates the logical arm, data Arm, row number and parity arm
 900  * for R56 CTIO write operation.
 901  */
 902 static void mr_get_phy_params_r56_rmw(struct megasas_instance *instance,
 903                             u32 ld, u64 stripNo,
 904                             struct IO_REQUEST_INFO *io_info,
 905                             struct RAID_CONTEXT_G35 *pRAID_Context,
 906                             struct MR_DRV_RAID_MAP_ALL *map)
 907 {
 908         struct MR_LD_RAID  *raid = MR_LdRaidGet(ld, map);
 909         u8          span, dataArms, arms, dataArm, logArm;
 910         s8          rightmostParityArm, PParityArm;
 911         u64         rowNum;
 912         u64 *pdBlock = &io_info->pdBlock;
 913
 914         dataArms = raid->rowDataSize;
 915         arms = raid->rowSize;
 916
 917         rowNum =  mega_div64_32(stripNo, dataArms);
 918         /* parity disk arm, first arm is 0 */
 919         rightmostParityArm = (arms - 1) - mega_mod64(rowNum, arms);
 920
 921         /* logical arm within row */
 922         logArm =  mega_mod64(stripNo, dataArms);
 923         /* physical arm for data */
 924         dataArm = mega_mod64((rightmostParityArm + 1 + logArm), arms);
 925
 926         if (raid->spanDepth == 1) {
 927                 span = 0;
 928         } else {
 929                 span = (u8)MR_GetSpanBlock(ld, rowNum, pdBlock, map);
 930                 if (span == SPAN_INVALID)
 931                         return;
 932         }
 933
 934         if (raid->level == 6) {
 935                 /* P Parity arm, note this can go negative adjust if negative */
 936                 PParityArm = (arms - 2) - mega_mod64(rowNum, arms);
 937
 938                 if (PParityArm < 0)
 939                         PParityArm += arms;
 940
 941                 /* rightmostParityArm is P-Parity for RAID 5 and Q-Parity for RAID */
 942                 pRAID_Context->flow_specific.r56_arm_map = rightmostParityArm;
 943                 pRAID_Context->flow_specific.r56_arm_map |=
 944                                     (u16)(PParityArm << RAID_CTX_R56_P_ARM_SHIFT);
 945         } else {
 946                 pRAID_Context->flow_specific.r56_arm_map |=
 947                                     (u16)(rightmostParityArm << RAID_CTX_R56_P_ARM_SHIFT);
 948         }
 949
 950         pRAID_Context->reg_lock_row_lba = cpu_to_le64(rowNum);
 951         pRAID_Context->flow_specific.r56_arm_map |=
 952                                    (u16)(logArm << RAID_CTX_R56_LOG_ARM_SHIFT);
 953         cpu_to_le16s(&pRAID_Context->flow_specific.r56_arm_map);
 954         pRAID_Context->span_arm = (span << RAID_CTX_SPANARM_SPAN_SHIFT) | dataArm;
 955         pRAID_Context->raid_flags = (MR_RAID_FLAGS_IO_SUB_TYPE_R56_DIV_OFFLOAD <<
 956                                     MR_RAID_CTX_RAID_FLAGS_IO_SUB_TYPE_SHIFT);
 957
 958         return;
 959 }
 960
 961 /*
 962 ******************************************************************************
 963 *
 964 * MR_BuildRaidContext function
 965 *
 966 * This function will initiate command processing.  The start/end row and strip
 967 * information is calculated then the lock is acquired.
 968 * This function will return 0 if region lock was acquired OR return num strips
 969 */
 970 u8
 971 MR_BuildRaidContext(struct megasas_instance *instance,
 972                     struct IO_REQUEST_INFO *io_info,
 973                     struct RAID_CONTEXT *pRAID_Context,
 974                     struct MR_DRV_RAID_MAP_ALL *map, u8 **raidLUN)
 975 {
 976         struct fusion_context *fusion;
 977         struct MR_LD_RAID  *raid;
 978         u32         stripSize, stripe_mask;
 979         u64         endLba, endStrip, endRow, start_row, start_strip;
 980         u64         regStart;
 981         u32         regSize;
 982         u8          num_strips, numRows;
 983         u16         ref_in_start_stripe, ref_in_end_stripe;
 984         u64         ldStartBlock;
 985         u32         numBlocks, ldTgtId;
 986         u8          isRead;
 987         u8          retval = 0;
 988         u8          startlba_span = SPAN_INVALID;
 989         u64 *pdBlock = &io_info->pdBlock;
 990         u16         ld;
 991
 992         ldStartBlock = io_info->ldStartBlock;
 993         numBlocks = io_info->numBlocks;
 994         ldTgtId = io_info->ldTgtId;
 995         isRead = io_info->isRead;
 996         io_info->IoforUnevenSpan = 0;
 997         io_info->start_span     = SPAN_INVALID;
 998         fusion = instance->ctrl_context;
 999
1000         ld = MR_TargetIdToLdGet(ldTgtId, map);
1001         raid = MR_LdRaidGet(ld, map);
1002         /*check read ahead bit*/
1003         io_info->ra_capable = raid->capability.ra_capable;
1004
1005         /*
1006          * if rowDataSize @RAID map and spanRowDataSize @SPAN INFO are zero
1007          * return FALSE
1008          */
1009         if (raid->rowDataSize == 0) {
1010                 if (MR_LdSpanPtrGet(ld, 0, map)->spanRowDataSize == 0)
1011                         return false;
1012                 else if (instance->UnevenSpanSupport) {
1013                         io_info->IoforUnevenSpan = 1;
1014                 } else {
1015                         dev_info(&instance->pdev->dev,
1016                                 "raid->rowDataSize is 0, but has SPAN[0]"
1017                                 "rowDataSize = 0x%0x,"
1018                                 "but there is _NO_ UnevenSpanSupport\n",
1019                                 MR_LdSpanPtrGet(ld, 0, map)->spanRowDataSize);
1020                         return false;
1021                 }
1022         }
1023
1024         stripSize = 1 << raid->stripeShift;
1025         stripe_mask = stripSize-1;
1026
1027         io_info->data_arms = raid->rowDataSize;
1028
1029         /*
1030          * calculate starting row and stripe, and number of strips and rows
1031          */
1032         start_strip         = ldStartBlock >> raid->stripeShift;
1033         ref_in_start_stripe = (u16)(ldStartBlock & stripe_mask);
1034         endLba              = ldStartBlock + numBlocks - 1;
1035         ref_in_end_stripe   = (u16)(endLba & stripe_mask);
1036         endStrip            = endLba >> raid->stripeShift;
1037         num_strips          = (u8)(endStrip - start_strip + 1); /* End strip */
1038
1039         if (io_info->IoforUnevenSpan) {
1040                 start_row = get_row_from_strip(instance, ld, start_strip, map);
1041                 endRow    = get_row_from_strip(instance, ld, endStrip, map);
1042                 if (start_row == -1ULL || endRow == -1ULL) {
1043                         dev_info(&instance->pdev->dev, "return from %s %d."
1044                                 "Send IO w/o region lock.\n",
1045                                 __func__, __LINE__);
1046                         return false;
1047                 }
1048
1049                 if (raid->spanDepth == 1) {
1050                         startlba_span = 0;
1051                         *pdBlock = start_row << raid->stripeShift;
1052                 } else
1053                         startlba_span = (u8)mr_spanset_get_span_block(instance,
1054                                                 ld, start_row, pdBlock, map);
1055                 if (startlba_span == SPAN_INVALID) {
1056                         dev_info(&instance->pdev->dev, "return from %s %d"
1057                                 "for row 0x%llx,start strip %llx"
1058                                 "endSrip %llx\n", __func__, __LINE__,
1059                                 (unsigned long long)start_row,
1060                                 (unsigned long long)start_strip,
1061                                 (unsigned long long)endStrip);
1062                         return false;
1063                 }
1064                 io_info->start_span     = startlba_span;
1065                 io_info->start_row      = start_row;
1066         } else {
1067                 start_row = mega_div64_32(start_strip, raid->rowDataSize);
1068                 endRow    = mega_div64_32(endStrip, raid->rowDataSize);
1069         }
1070         numRows = (u8)(endRow - start_row + 1);
1071
1072         /*
1073          * calculate region info.
1074          */
1075
1076         /* assume region is at the start of the first row */
1077         regStart            = start_row << raid->stripeShift;
1078         /* assume this IO needs the full row - we'll adjust if not true */
1079         regSize             = stripSize;
1080
1081         io_info->do_fp_rlbypass = raid->capability.fpBypassRegionLock;
1082
1083         /* Check if we can send this I/O via FastPath */
1084         if (raid->capability.fpCapable) {
1085                 if (isRead)
1086                         io_info->fpOkForIo = (raid->capability.fpReadCapable &&
1087                                               ((num_strips == 1) ||
1088                                                raid->capability.
1089                                                fpReadAcrossStripe));
1090                 else
1091                         io_info->fpOkForIo = (raid->capability.fpWriteCapable &&
1092                                               ((num_strips == 1) ||
1093                                                raid->capability.
1094                                                fpWriteAcrossStripe));
1095         } else
1096                 io_info->fpOkForIo = false;
1097
1098         if (numRows == 1) {
1099                 /* single-strip IOs can always lock only the data needed */
1100                 if (num_strips == 1) {
1101                         regStart += ref_in_start_stripe;
1102                         regSize = numBlocks;
1103                 }
1104                 /* multi-strip IOs always need to full stripe locked */
1105         } else if (io_info->IoforUnevenSpan == 0) {
1106                 /*
1107                  * For Even span region lock optimization.
1108                  * If the start strip is the last in the start row
1109                  */
1110                 if (start_strip == (start_row + 1) * raid->rowDataSize - 1) {
1111                         regStart += ref_in_start_stripe;
1112                         /* initialize count to sectors from startref to end
1113                            of strip */
1114                         regSize = stripSize - ref_in_start_stripe;
1115                 }
1116
1117                 /* add complete rows in the middle of the transfer */
1118                 if (numRows > 2)
1119                         regSize += (numRows-2) << raid->stripeShift;
1120
1121                 /* if IO ends within first strip of last row*/
1122                 if (endStrip == endRow*raid->rowDataSize)
1123                         regSize += ref_in_end_stripe+1;
1124                 else
1125                         regSize += stripSize;
1126         } else {
1127                 /*
1128                  * For Uneven span region lock optimization.
1129                  * If the start strip is the last in the start row
1130                  */
1131                 if (start_strip == (get_strip_from_row(instance, ld, start_row, map) +
1132                                 SPAN_ROW_DATA_SIZE(map, ld, startlba_span) - 1)) {
1133                         regStart += ref_in_start_stripe;
1134                         /* initialize count to sectors from
1135                          * startRef to end of strip
1136                          */
1137                         regSize = stripSize - ref_in_start_stripe;
1138                 }
1139                 /* Add complete rows in the middle of the transfer*/
1140
1141                 if (numRows > 2)
1142                         /* Add complete rows in the middle of the transfer*/
1143                         regSize += (numRows-2) << raid->stripeShift;
1144
1145                 /* if IO ends within first strip of last row */
1146                 if (endStrip == get_strip_from_row(instance, ld, endRow, map))
1147                         regSize += ref_in_end_stripe + 1;
1148                 else
1149                         regSize += stripSize;
1150         }
1151
1152         pRAID_Context->timeout_value =
1153                 cpu_to_le16(raid->fpIoTimeoutForLd ?
1154                             raid->fpIoTimeoutForLd :
1155                             map->raidMap.fpPdIoTimeoutSec);
1156         if (instance->adapter_type == INVADER_SERIES)
1157                 pRAID_Context->reg_lock_flags = (isRead) ?
1158                         raid->regTypeReqOnRead : raid->regTypeReqOnWrite;
1159         else if (instance->adapter_type == THUNDERBOLT_SERIES)
1160                 pRAID_Context->reg_lock_flags = (isRead) ?
1161                         REGION_TYPE_SHARED_READ : raid->regTypeReqOnWrite;
1162         pRAID_Context->virtual_disk_tgt_id = raid->targetId;
1163         pRAID_Context->reg_lock_row_lba    = cpu_to_le64(regStart);
1164         pRAID_Context->reg_lock_length    = cpu_to_le32(regSize);
1165         pRAID_Context->config_seq_num   = raid->seqNum;
1166         /* save pointer to raid->LUN array */
1167         *raidLUN = raid->LUN;
1168
1169         /* Aero R5/6 Division Offload for WRITE */
1170         if (fusion->r56_div_offload && (raid->level >= 5) && !isRead) {
1171                 mr_get_phy_params_r56_rmw(instance, ld, start_strip, io_info,
1172                                        (struct RAID_CONTEXT_G35 *)pRAID_Context,
1173                                        map);
1174                 return true;
1175         }
1176
1177         /*Get Phy Params only if FP capable, or else leave it to MR firmware
1178           to do the calculation.*/
1179         if (io_info->fpOkForIo) {
1180                 retval = io_info->IoforUnevenSpan ?
1181                                 mr_spanset_get_phy_params(instance, ld,
1182                                         start_strip, ref_in_start_stripe,
1183                                         io_info, pRAID_Context, map) :
1184                                 MR_GetPhyParams(instance, ld, start_strip,
1185                                         ref_in_start_stripe, io_info,
1186                                         pRAID_Context, map);
1187                 /* If IO on an invalid Pd, then FP is not possible.*/
1188                 if (io_info->devHandle == MR_DEVHANDLE_INVALID)
1189                         io_info->fpOkForIo = false;
1190                 return retval;
1191         } else if (isRead) {
1192                 uint stripIdx;
1193                 for (stripIdx = 0; stripIdx < num_strips; stripIdx++) {
1194                         retval = io_info->IoforUnevenSpan ?
1195                                 mr_spanset_get_phy_params(instance, ld,
1196                                     start_strip + stripIdx,
1197                                     ref_in_start_stripe, io_info,
1198                                     pRAID_Context, map) :
1199                                 MR_GetPhyParams(instance, ld,
1200                                     start_strip + stripIdx, ref_in_start_stripe,
1201                                     io_info, pRAID_Context, map);
1202                         if (!retval)
1203                                 return true;
1204                 }
1205         }
1206         return true;
1207 }
1208
1209 /*
1210 ******************************************************************************
1211 *
1212 * This routine pepare spanset info from Valid Raid map and store it into
1213 * local copy of ldSpanInfo per instance data structure.
1214 *
1215 * Inputs :
1216 * map    - LD map
1217 * ldSpanInfo - ldSpanInfo per HBA instance
1218 *
1219 */
1220 void mr_update_span_set(struct MR_DRV_RAID_MAP_ALL *map,
1221         PLD_SPAN_INFO ldSpanInfo)
1222 {
1223         u8   span, count;
1224         u32  element, span_row_width;
1225         u64  span_row;
1226         struct MR_LD_RAID *raid;
1227         LD_SPAN_SET *span_set, *span_set_prev;
1228         struct MR_QUAD_ELEMENT    *quad;
1229         int ldCount;
1230         u16 ld;
1231
1232
1233         for (ldCount = 0; ldCount < MAX_LOGICAL_DRIVES_EXT; ldCount++) {
1234                 ld = MR_TargetIdToLdGet(ldCount, map);
1235                 if (ld >= (MAX_LOGICAL_DRIVES_EXT - 1))
1236                         continue;
1237                 raid = MR_LdRaidGet(ld, map);
1238                 for (element = 0; element < MAX_QUAD_DEPTH; element++) {
1239                         for (span = 0; span < raid->spanDepth; span++) {
1240                                 if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
1241                                         block_span_info.noElements) <
1242                                         element + 1)
1243                                         continue;
1244                                 span_set = &(ldSpanInfo[ld].span_set[element]);
1245                                 quad = &map->raidMap.ldSpanMap[ld].
1246                                         spanBlock[span].block_span_info.
1247                                         quad[element];
1248
1249                                 span_set->diff = le32_to_cpu(quad->diff);
1250
1251                                 for (count = 0, span_row_width = 0;
1252                                         count < raid->spanDepth; count++) {
1253                                         if (le32_to_cpu(map->raidMap.ldSpanMap[ld].
1254                                                 spanBlock[count].
1255                                                 block_span_info.
1256                                                 noElements) >= element + 1) {
1257                                                 span_set->strip_offset[count] =
1258                                                         span_row_width;
1259                                                 span_row_width +=
1260                                                         MR_LdSpanPtrGet
1261                                                         (ld, count, map)->spanRowDataSize;
1262                                         }
1263                                 }
1264
1265                                 span_set->span_row_data_width = span_row_width;
1266                                 span_row = mega_div64_32(((le64_to_cpu(quad->logEnd) -
1267                                         le64_to_cpu(quad->logStart)) + le32_to_cpu(quad->diff)),
1268                                         le32_to_cpu(quad->diff));
1269
1270                                 if (element == 0) {
1271                                         span_set->log_start_lba = 0;
1272                                         span_set->log_end_lba =
1273                                                 ((span_row << raid->stripeShift)
1274                                                 * span_row_width) - 1;
1275
1276                                         span_set->span_row_start = 0;
1277                                         span_set->span_row_end = span_row - 1;
1278
1279                                         span_set->data_strip_start = 0;
1280                                         span_set->data_strip_end =
1281                                                 (span_row * span_row_width) - 1;
1282
1283                                         span_set->data_row_start = 0;
1284                                         span_set->data_row_end =
1285                                                 (span_row * le32_to_cpu(quad->diff)) - 1;
1286                                 } else {
1287                                         span_set_prev = &(ldSpanInfo[ld].
1288                                                         span_set[element - 1]);
1289                                         span_set->log_start_lba =
1290                                                 span_set_prev->log_end_lba + 1;
1291                                         span_set->log_end_lba =
1292                                                 span_set->log_start_lba +
1293                                                 ((span_row << raid->stripeShift)
1294                                                 * span_row_width) - 1;
1295
1296                                         span_set->span_row_start =
1297                                                 span_set_prev->span_row_end + 1;
1298                                         span_set->span_row_end =
1299                                         span_set->span_row_start + span_row - 1;
1300
1301                                         span_set->data_strip_start =
1302                                         span_set_prev->data_strip_end + 1;
1303                                         span_set->data_strip_end =
1304                                                 span_set->data_strip_start +
1305                                                 (span_row * span_row_width) - 1;
1306
1307                                         span_set->data_row_start =
1308                                                 span_set_prev->data_row_end + 1;
1309                                         span_set->data_row_end =
1310                                                 span_set->data_row_start +
1311                                                 (span_row * le32_to_cpu(quad->diff)) - 1;
1312                                 }
1313                                 break;
1314                 }
1315                 if (span == raid->spanDepth)
1316                         break;
1317             }
1318         }
1319 }
1320
1321 void mr_update_load_balance_params(struct MR_DRV_RAID_MAP_ALL *drv_map,
1322         struct LD_LOAD_BALANCE_INFO *lbInfo)
1323 {
1324         int ldCount;
1325         u16 ld;
1326         struct MR_LD_RAID *raid;
1327
1328         if (lb_pending_cmds > 128 || lb_pending_cmds < 1)
1329                 lb_pending_cmds = LB_PENDING_CMDS_DEFAULT;
1330
1331         for (ldCount = 0; ldCount < MAX_LOGICAL_DRIVES_EXT; ldCount++) {
1332                 ld = MR_TargetIdToLdGet(ldCount, drv_map);
1333                 if (ld >= MAX_LOGICAL_DRIVES_EXT - 1) {
1334                         lbInfo[ldCount].loadBalanceFlag = 0;
1335                         continue;
1336                 }
1337
1338                 raid = MR_LdRaidGet(ld, drv_map);
1339                 if ((raid->level != 1) ||
1340                         (raid->ldState != MR_LD_STATE_OPTIMAL)) {
1341                         lbInfo[ldCount].loadBalanceFlag = 0;
1342                         continue;
1343                 }
1344                 lbInfo[ldCount].loadBalanceFlag = 1;
1345         }
1346 }
1347
1348 static u8 megasas_get_best_arm_pd(struct megasas_instance *instance,
1349                            struct LD_LOAD_BALANCE_INFO *lbInfo,
1350                            struct IO_REQUEST_INFO *io_info,
1351                            struct MR_DRV_RAID_MAP_ALL *drv_map)
1352 {
1353         struct MR_LD_RAID  *raid;
1354         u16     pd1_dev_handle;
1355         u16     pend0, pend1, ld;
1356         u64     diff0, diff1;
1357         u8      bestArm, pd0, pd1, span, arm;
1358         u32     arRef, span_row_size;
1359
1360         u64 block = io_info->ldStartBlock;
1361         u32 count = io_info->numBlocks;
1362
1363         span = ((io_info->span_arm & RAID_CTX_SPANARM_SPAN_MASK)
1364                         >> RAID_CTX_SPANARM_SPAN_SHIFT);
1365         arm = (io_info->span_arm & RAID_CTX_SPANARM_ARM_MASK);
1366
1367         ld = MR_TargetIdToLdGet(io_info->ldTgtId, drv_map);
1368         raid = MR_LdRaidGet(ld, drv_map);
1369         span_row_size = instance->UnevenSpanSupport ?
1370                         SPAN_ROW_SIZE(drv_map, ld, span) : raid->rowSize;
1371
1372         arRef = MR_LdSpanArrayGet(ld, span, drv_map);
1373         pd0 = MR_ArPdGet(arRef, arm, drv_map);
1374         pd1 = MR_ArPdGet(arRef, (arm + 1) >= span_row_size ?
1375                 (arm + 1 - span_row_size) : arm + 1, drv_map);
1376
1377         /* Get PD1 Dev Handle */
1378
1379         pd1_dev_handle = MR_PdDevHandleGet(pd1, drv_map);
1380
1381         if (pd1_dev_handle == MR_DEVHANDLE_INVALID) {
1382                 bestArm = arm;
1383         } else {
1384                 /* get the pending cmds for the data and mirror arms */
1385                 pend0 = atomic_read(&lbInfo->scsi_pending_cmds[pd0]);
1386                 pend1 = atomic_read(&lbInfo->scsi_pending_cmds[pd1]);
1387
1388                 /* Determine the disk whose head is nearer to the req. block */
1389                 diff0 = ABS_DIFF(block, lbInfo->last_accessed_block[pd0]);
1390                 diff1 = ABS_DIFF(block, lbInfo->last_accessed_block[pd1]);
1391                 bestArm = (diff0 <= diff1 ? arm : arm ^ 1);
1392
1393                 /* Make balance count from 16 to 4 to
1394                  *  keep driver in sync with Firmware
1395                  */
1396                 if ((bestArm == arm && pend0 > pend1 + lb_pending_cmds)  ||
1397                     (bestArm != arm && pend1 > pend0 + lb_pending_cmds))
1398                         bestArm ^= 1;
1399
1400                 /* Update the last accessed block on the correct pd */
1401                 io_info->span_arm =
1402                         (span << RAID_CTX_SPANARM_SPAN_SHIFT) | bestArm;
1403                 io_info->pd_after_lb = (bestArm == arm) ? pd0 : pd1;
1404         }
1405
1406         lbInfo->last_accessed_block[io_info->pd_after_lb] = block + count - 1;
1407         return io_info->pd_after_lb;
1408 }
1409
1410 __le16 get_updated_dev_handle(struct megasas_instance *instance,
1411                               struct LD_LOAD_BALANCE_INFO *lbInfo,
1412                               struct IO_REQUEST_INFO *io_info,
1413                               struct MR_DRV_RAID_MAP_ALL *drv_map)
1414 {
1415         u8 arm_pd;
1416         __le16 devHandle;
1417
1418         /* get best new arm (PD ID) */
1419         arm_pd  = megasas_get_best_arm_pd(instance, lbInfo, io_info, drv_map);
1420         devHandle = MR_PdDevHandleGet(arm_pd, drv_map);
1421         io_info->pd_interface = MR_PdInterfaceTypeGet(arm_pd, drv_map);
1422         atomic_inc(&lbInfo->scsi_pending_cmds[arm_pd]);
1423
1424         return devHandle;
1425 }