drivers/scsi/megaraid/megaraid_sas_fp.c

   1 /*
   2  *  Linux MegaRAID driver for SAS based RAID controllers
   3  *
   4  *  Copyright (c) 2009-2013  LSI Corporation
   5  *  Copyright (c) 2013-2014  Avago Technologies
   6  *
   7  *  This program is free software; you can redistribute it and/or
   8  *  modify it under the terms of the GNU General Public License
   9  *  as published by the Free Software Foundation; either version 2
  10  *  of the License, or (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19  *
  20  *  FILE: megaraid_sas_fp.c
  21  *
  22  *  Authors: Avago Technologies
  23  *           Sumant Patro
  24  *           Varad Talamacki
  25  *           Manoj Jose
  26  *           Kashyap Desai <kashyap.desai@avagotech.com>
  27  *           Sumit Saxena <sumit.saxena@avagotech.com>
  28  *
  29  *  Send feedback to: megaraidlinux.pdl@avagotech.com
  30  *
  31  *  Mail to: Avago Technologies, 350 West Trimble Road, Building 90,
  32  *  San Jose, California 95131
  33  */
  34
  35 #include <linux/kernel.h>
  36 #include <linux/types.h>
  37 #include <linux/pci.h>
  38 #include <linux/list.h>
  39 #include <linux/moduleparam.h>
  40 #include <linux/module.h>
  41 #include <linux/spinlock.h>
  42 #include <linux/interrupt.h>
  43 #include <linux/delay.h>
  44 #include <linux/uio.h>
  45 #include <linux/uaccess.h>
  46 #include <linux/fs.h>
  47 #include <linux/compat.h>
  48 #include <linux/blkdev.h>
  49 #include <linux/poll.h>
  50
  51 #include <scsi/scsi.h>
  52 #include <scsi/scsi_cmnd.h>
  53 #include <scsi/scsi_device.h>
  54 #include <scsi/scsi_host.h>
  55
  56 #include "megaraid_sas_fusion.h"
  57 #include "megaraid_sas.h"
  58 #include <asm/div64.h>
  59
  60 #define LB_PENDING_CMDS_DEFAULT 4
  61 static unsigned int lb_pending_cmds = LB_PENDING_CMDS_DEFAULT;
  62 module_param(lb_pending_cmds, int, S_IRUGO);
  63 MODULE_PARM_DESC(lb_pending_cmds, "Change raid-1 load balancing outstanding "
  64         "threshold. Valid Values are 1-128. Default: 4");
  65
  66
  67 #define ABS_DIFF(a, b)   (((a) > (b)) ? ((a) - (b)) : ((b) - (a)))
  68 #define MR_LD_STATE_OPTIMAL 3
  69 #define FALSE 0
  70 #define TRUE 1
  71
  72 #define SPAN_DEBUG 0
  73 #define SPAN_ROW_SIZE(map, ld, index_) (MR_LdSpanPtrGet(ld, index_, map)->spanRowSize)
  74 #define SPAN_ROW_DATA_SIZE(map_, ld, index_)   (MR_LdSpanPtrGet(ld, index_, map)->spanRowDataSize)
  75 #define SPAN_INVALID  0xff
  76
  77 /* Prototypes */
  78 static void mr_update_span_set(struct MR_DRV_RAID_MAP_ALL *map,
  79         PLD_SPAN_INFO ldSpanInfo);
  80 static u8 mr_spanset_get_phy_params(struct megasas_instance *instance, u32 ld,
  81         u64 stripRow, u16 stripRef, struct IO_REQUEST_INFO *io_info,
  82         struct RAID_CONTEXT *pRAID_Context, struct MR_DRV_RAID_MAP_ALL *map);
  83 static u64 get_row_from_strip(struct megasas_instance *instance, u32 ld,
  84         u64 strip, struct MR_DRV_RAID_MAP_ALL *map);
  85
  86 u32 mega_mod64(u64 dividend, u32 divisor)
  87 {
  88         u64 d;
  89         u32 remainder;
  90
  91         if (!divisor)
  92                 printk(KERN_ERR "megasas : DIVISOR is zero, in div fn\n");
  93         d = dividend;
  94         remainder = do_div(d, divisor);
  95         return remainder;
  96 }
  97
  98 /**
  99  * @param dividend    : Dividend
 100  * @param divisor    : Divisor
 101  *
 102  * @return quotient
 103  **/
 104 u64 mega_div64_32(uint64_t dividend, uint32_t divisor)
 105 {
 106         u32 remainder;
 107         u64 d;
 108
 109         if (!divisor)
 110                 printk(KERN_ERR "megasas : DIVISOR is zero in mod fn\n");
 111
 112         d = dividend;
 113         remainder = do_div(d, divisor);
 114
 115         return d;
 116 }
 117
 118 struct MR_LD_RAID *MR_LdRaidGet(u32 ld, struct MR_DRV_RAID_MAP_ALL *map)
 119 {
 120         return &map->raidMap.ldSpanMap[ld].ldRaid;
 121 }
 122
 123 static struct MR_SPAN_BLOCK_INFO *MR_LdSpanInfoGet(u32 ld,
 124                                                    struct MR_DRV_RAID_MAP_ALL
 125                                                    *map)
 126 {
 127         return &map->raidMap.ldSpanMap[ld].spanBlock[0];
 128 }
 129
 130 static u8 MR_LdDataArmGet(u32 ld, u32 armIdx, struct MR_DRV_RAID_MAP_ALL *map)
 131 {
 132         return map->raidMap.ldSpanMap[ld].dataArmMap[armIdx];
 133 }
 134
 135 u16 MR_ArPdGet(u32 ar, u32 arm, struct MR_DRV_RAID_MAP_ALL *map)
 136 {
 137         return le16_to_cpu(map->raidMap.arMapInfo[ar].pd[arm]);
 138 }
 139
 140 u16 MR_LdSpanArrayGet(u32 ld, u32 span, struct MR_DRV_RAID_MAP_ALL *map)
 141 {
 142         return le16_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].span.arrayRef);
 143 }
 144
 145 u16 MR_PdDevHandleGet(u32 pd, struct MR_DRV_RAID_MAP_ALL *map)
 146 {
 147         return map->raidMap.devHndlInfo[pd].curDevHdl;
 148 }
 149
 150 u16 MR_GetLDTgtId(u32 ld, struct MR_DRV_RAID_MAP_ALL *map)
 151 {
 152         return le16_to_cpu(map->raidMap.ldSpanMap[ld].ldRaid.targetId);
 153 }
 154
 155 u8 MR_TargetIdToLdGet(u32 ldTgtId, struct MR_DRV_RAID_MAP_ALL *map)
 156 {
 157         return map->raidMap.ldTgtIdToLd[ldTgtId];
 158 }
 159
 160 static struct MR_LD_SPAN *MR_LdSpanPtrGet(u32 ld, u32 span,
 161                                           struct MR_DRV_RAID_MAP_ALL *map)
 162 {
 163         return &map->raidMap.ldSpanMap[ld].spanBlock[span].span;
 164 }
 165
 166 /*
 167  * This function will Populate Driver Map using firmware raid map
 168  */
 169 void MR_PopulateDrvRaidMap(struct megasas_instance *instance)
 170 {
 171         struct fusion_context *fusion = instance->ctrl_context;
 172         struct MR_FW_RAID_MAP_ALL     *fw_map_old    = NULL;
 173         struct MR_FW_RAID_MAP         *pFwRaidMap    = NULL;
 174         int i;
 175
 176
 177         struct MR_DRV_RAID_MAP_ALL *drv_map =
 178                         fusion->ld_drv_map[(instance->map_id & 1)];
 179         struct MR_DRV_RAID_MAP *pDrvRaidMap = &drv_map->raidMap;
 180
 181         if (instance->supportmax256vd) {
 182                 memcpy(fusion->ld_drv_map[instance->map_id & 1],
 183                         fusion->ld_map[instance->map_id & 1],
 184                         fusion->current_map_sz);
 185                 /* New Raid map will not set totalSize, so keep expected value
 186                  * for legacy code in ValidateMapInfo
 187                  */
 188                 pDrvRaidMap->totalSize =
 189                         cpu_to_le32(sizeof(struct MR_FW_RAID_MAP_EXT));
 190         } else {
 191                 fw_map_old = (struct MR_FW_RAID_MAP_ALL *)
 192                         fusion->ld_map[(instance->map_id & 1)];
 193                 pFwRaidMap = &fw_map_old->raidMap;
 194
 195 #if VD_EXT_DEBUG
 196                 for (i = 0; i < le16_to_cpu(pFwRaidMap->ldCount); i++) {
 197                         dev_dbg(&instance->pdev->dev, "(%d) :Index 0x%x "
 198                                 "Target Id 0x%x Seq Num 0x%x Size 0/%llx\n",
 199                                 instance->unique_id, i,
 200                                 fw_map_old->raidMap.ldSpanMap[i].ldRaid.targetId,
 201                                 fw_map_old->raidMap.ldSpanMap[i].ldRaid.seqNum,
 202                                 fw_map_old->raidMap.ldSpanMap[i].ldRaid.size);
 203                 }
 204 #endif
 205
 206                 memset(drv_map, 0, fusion->drv_map_sz);
 207                 pDrvRaidMap->totalSize = pFwRaidMap->totalSize;
 208                 pDrvRaidMap->ldCount = (__le16)pFwRaidMap->ldCount;
 209                 pDrvRaidMap->fpPdIoTimeoutSec = pFwRaidMap->fpPdIoTimeoutSec;
 210                 for (i = 0; i < MAX_RAIDMAP_LOGICAL_DRIVES + MAX_RAIDMAP_VIEWS; i++)
 211                         pDrvRaidMap->ldTgtIdToLd[i] =
 212                                 (u8)pFwRaidMap->ldTgtIdToLd[i];
 213                 for (i = 0; i < le16_to_cpu(pDrvRaidMap->ldCount); i++) {
 214                         pDrvRaidMap->ldSpanMap[i] = pFwRaidMap->ldSpanMap[i];
 215 #if VD_EXT_DEBUG
 216                         dev_dbg(&instance->pdev->dev,
 217                                 "pFwRaidMap->ldSpanMap[%d].ldRaid.targetId 0x%x "
 218                                 "pFwRaidMap->ldSpanMap[%d].ldRaid.seqNum 0x%x "
 219                                 "size 0x%x\n", i, i,
 220                                 pFwRaidMap->ldSpanMap[i].ldRaid.targetId,
 221                                 pFwRaidMap->ldSpanMap[i].ldRaid.seqNum,
 222                                 (u32)pFwRaidMap->ldSpanMap[i].ldRaid.rowSize);
 223                         dev_dbg(&instance->pdev->dev,
 224                                 "pDrvRaidMap->ldSpanMap[%d].ldRaid.targetId 0x%x "
 225                                 "pDrvRaidMap->ldSpanMap[%d].ldRaid.seqNum 0x%x "
 226                                 "size 0x%x\n", i, i,
 227                                 pDrvRaidMap->ldSpanMap[i].ldRaid.targetId,
 228                                 pDrvRaidMap->ldSpanMap[i].ldRaid.seqNum,
 229                                 (u32)pDrvRaidMap->ldSpanMap[i].ldRaid.rowSize);
 230                         dev_dbg(&instance->pdev->dev, "Driver raid map all %p "
 231                                 "raid map %p LD RAID MAP %p/%p\n", drv_map,
 232                                 pDrvRaidMap, &pFwRaidMap->ldSpanMap[i].ldRaid,
 233                                 &pDrvRaidMap->ldSpanMap[i].ldRaid);
 234 #endif
 235                 }
 236                 memcpy(pDrvRaidMap->arMapInfo, pFwRaidMap->arMapInfo,
 237                         sizeof(struct MR_ARRAY_INFO) * MAX_RAIDMAP_ARRAYS);
 238                 memcpy(pDrvRaidMap->devHndlInfo, pFwRaidMap->devHndlInfo,
 239                         sizeof(struct MR_DEV_HANDLE_INFO) *
 240                         MAX_RAIDMAP_PHYSICAL_DEVICES);
 241         }
 242 }
 243
 244 /*
 245  * This function will validate Map info data provided by FW
 246  */
 247 u8 MR_ValidateMapInfo(struct megasas_instance *instance)
 248 {
 249         struct fusion_context *fusion;
 250         struct MR_DRV_RAID_MAP_ALL *drv_map;
 251         struct MR_DRV_RAID_MAP *pDrvRaidMap;
 252         struct LD_LOAD_BALANCE_INFO *lbInfo;
 253         PLD_SPAN_INFO ldSpanInfo;
 254         struct MR_LD_RAID         *raid;
 255         int ldCount, num_lds;
 256         u16 ld;
 257         u32 expected_size;
 258
 259
 260         MR_PopulateDrvRaidMap(instance);
 261
 262         fusion = instance->ctrl_context;
 263         drv_map = fusion->ld_drv_map[(instance->map_id & 1)];
 264         pDrvRaidMap = &drv_map->raidMap;
 265
 266         lbInfo = fusion->load_balance_info;
 267         ldSpanInfo = fusion->log_to_span;
 268
 269         if (instance->supportmax256vd)
 270                 expected_size = sizeof(struct MR_FW_RAID_MAP_EXT);
 271         else
 272                 expected_size =
 273                         (sizeof(struct MR_FW_RAID_MAP) - sizeof(struct MR_LD_SPAN_MAP) +
 274                         (sizeof(struct MR_LD_SPAN_MAP) * le16_to_cpu(pDrvRaidMap->ldCount)));
 275
 276         if (le32_to_cpu(pDrvRaidMap->totalSize) != expected_size) {
 277                 dev_err(&instance->pdev->dev, "map info structure size 0x%x is not matching with ld count\n",
 278                        (unsigned int) expected_size);
 279                 dev_err(&instance->pdev->dev, "megasas: span map %x, pDrvRaidMap->totalSize : %x\n",
 280                         (unsigned int)sizeof(struct MR_LD_SPAN_MAP),
 281                         le32_to_cpu(pDrvRaidMap->totalSize));
 282                 return 0;
 283         }
 284
 285         if (instance->UnevenSpanSupport)
 286                 mr_update_span_set(drv_map, ldSpanInfo);
 287
 288         mr_update_load_balance_params(drv_map, lbInfo);
 289
 290         num_lds = le16_to_cpu(drv_map->raidMap.ldCount);
 291
 292         /*Convert Raid capability values to CPU arch */
 293         for (ldCount = 0; ldCount < num_lds; ldCount++) {
 294                 ld = MR_TargetIdToLdGet(ldCount, drv_map);
 295                 raid = MR_LdRaidGet(ld, drv_map);
 296                 le32_to_cpus((u32 *)&raid->capability);
 297         }
 298
 299         return 1;
 300 }
 301
 302 u32 MR_GetSpanBlock(u32 ld, u64 row, u64 *span_blk,
 303                     struct MR_DRV_RAID_MAP_ALL *map)
 304 {
 305         struct MR_SPAN_BLOCK_INFO *pSpanBlock = MR_LdSpanInfoGet(ld, map);
 306         struct MR_QUAD_ELEMENT    *quad;
 307         struct MR_LD_RAID         *raid = MR_LdRaidGet(ld, map);
 308         u32                span, j;
 309
 310         for (span = 0; span < raid->spanDepth; span++, pSpanBlock++) {
 311
 312                 for (j = 0; j < le32_to_cpu(pSpanBlock->block_span_info.noElements); j++) {
 313                         quad = &pSpanBlock->block_span_info.quad[j];
 314
 315                         if (le32_to_cpu(quad->diff) == 0)
 316                                 return SPAN_INVALID;
 317                         if (le64_to_cpu(quad->logStart) <= row && row <=
 318                                 le64_to_cpu(quad->logEnd) && (mega_mod64(row - le64_to_cpu(quad->logStart),
 319                                 le32_to_cpu(quad->diff))) == 0) {
 320                                 if (span_blk != NULL) {
 321                                         u64  blk, debugBlk;
 322                                         blk =  mega_div64_32((row-le64_to_cpu(quad->logStart)), le32_to_cpu(quad->diff));
 323                                         debugBlk = blk;
 324
 325                                         blk = (blk + le64_to_cpu(quad->offsetInSpan)) << raid->stripeShift;
 326                                         *span_blk = blk;
 327                                 }
 328                                 return span;
 329                         }
 330                 }
 331         }
 332         return SPAN_INVALID;
 333 }
 334
 335 /*
 336 ******************************************************************************
 337 *
 338 * Function to print info about span set created in driver from FW raid map
 339 *
 340 * Inputs :
 341 * map    - LD map
 342 * ldSpanInfo - ldSpanInfo per HBA instance
 343 */
 344 #if SPAN_DEBUG
 345 static int getSpanInfo(struct MR_DRV_RAID_MAP_ALL *map,
 346         PLD_SPAN_INFO ldSpanInfo)
 347 {
 348
 349         u8   span;
 350         u32    element;
 351         struct MR_LD_RAID *raid;
 352         LD_SPAN_SET *span_set;
 353         struct MR_QUAD_ELEMENT    *quad;
 354         int ldCount;
 355         u16 ld;
 356
 357         for (ldCount = 0; ldCount < MAX_LOGICAL_DRIVES_EXT; ldCount++) {
 358                 ld = MR_TargetIdToLdGet(ldCount, map);
 359                         if (ld >= MAX_LOGICAL_DRIVES_EXT)
 360                                 continue;
 361                 raid = MR_LdRaidGet(ld, map);
 362                 dev_dbg(&instance->pdev->dev, "LD %x: span_depth=%x\n",
 363                         ld, raid->spanDepth);
 364                 for (span = 0; span < raid->spanDepth; span++)
 365                         dev_dbg(&instance->pdev->dev, "Span=%x,"
 366                         " number of quads=%x\n", span,
 367                         le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
 368                         block_span_info.noElements));
 369                 for (element = 0; element < MAX_QUAD_DEPTH; element++) {
 370                         span_set = &(ldSpanInfo[ld].span_set[element]);
 371                         if (span_set->span_row_data_width == 0)
 372                                 break;
 373
 374                         dev_dbg(&instance->pdev->dev, "Span Set %x:"
 375                                 "width=%x, diff=%x\n", element,
 376                                 (unsigned int)span_set->span_row_data_width,
 377                                 (unsigned int)span_set->diff);
 378                         dev_dbg(&instance->pdev->dev, "logical LBA"
 379                                 "start=0x%08lx, end=0x%08lx\n",
 380                                 (long unsigned int)span_set->log_start_lba,
 381                                 (long unsigned int)span_set->log_end_lba);
 382                         dev_dbg(&instance->pdev->dev, "span row start=0x%08lx,"
 383                                 " end=0x%08lx\n",
 384                                 (long unsigned int)span_set->span_row_start,
 385                                 (long unsigned int)span_set->span_row_end);
 386                         dev_dbg(&instance->pdev->dev, "data row start=0x%08lx,"
 387                                 " end=0x%08lx\n",
 388                                 (long unsigned int)span_set->data_row_start,
 389                                 (long unsigned int)span_set->data_row_end);
 390                         dev_dbg(&instance->pdev->dev, "data strip start=0x%08lx,"
 391                                 " end=0x%08lx\n",
 392                                 (long unsigned int)span_set->data_strip_start,
 393                                 (long unsigned int)span_set->data_strip_end);
 394
 395                         for (span = 0; span < raid->spanDepth; span++) {
 396                                 if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
 397                                         block_span_info.noElements) >=
 398                                         element + 1) {
 399                                         quad = &map->raidMap.ldSpanMap[ld].
 400                                                 spanBlock[span].block_span_info.
 401                                                 quad[element];
 402                                 dev_dbg(&instance->pdev->dev, "Span=%x,"
 403                                         "Quad=%x, diff=%x\n", span,
 404                                         element, le32_to_cpu(quad->diff));
 405                                 dev_dbg(&instance->pdev->dev,
 406                                         "offset_in_span=0x%08lx\n",
 407                                         (long unsigned int)le64_to_cpu(quad->offsetInSpan));
 408                                 dev_dbg(&instance->pdev->dev,
 409                                         "logical start=0x%08lx, end=0x%08lx\n",
 410                                         (long unsigned int)le64_to_cpu(quad->logStart),
 411                                         (long unsigned int)le64_to_cpu(quad->logEnd));
 412                                 }
 413                         }
 414                 }
 415         }
 416         return 0;
 417 }
 418 #endif
 419
 420 /*
 421 ******************************************************************************
 422 *
 423 * This routine calculates the Span block for given row using spanset.
 424 *
 425 * Inputs :
 426 *    instance - HBA instance
 427 *    ld   - Logical drive number
 428 *    row        - Row number
 429 *    map    - LD map
 430 *
 431 * Outputs :
 432 *
 433 *    span          - Span number
 434 *    block         - Absolute Block number in the physical disk
 435 *    div_error     - Devide error code.
 436 */
 437
 438 u32 mr_spanset_get_span_block(struct megasas_instance *instance,
 439                 u32 ld, u64 row, u64 *span_blk, struct MR_DRV_RAID_MAP_ALL *map)
 440 {
 441         struct fusion_context *fusion = instance->ctrl_context;
 442         struct MR_LD_RAID         *raid = MR_LdRaidGet(ld, map);
 443         LD_SPAN_SET *span_set;
 444         struct MR_QUAD_ELEMENT    *quad;
 445         u32    span, info;
 446         PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span;
 447
 448         for (info = 0; info < MAX_QUAD_DEPTH; info++) {
 449                 span_set = &(ldSpanInfo[ld].span_set[info]);
 450
 451                 if (span_set->span_row_data_width == 0)
 452                         break;
 453
 454                 if (row > span_set->data_row_end)
 455                         continue;
 456
 457                 for (span = 0; span < raid->spanDepth; span++)
 458                         if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
 459                                 block_span_info.noElements) >= info+1) {
 460                                 quad = &map->raidMap.ldSpanMap[ld].
 461                                         spanBlock[span].
 462                                         block_span_info.quad[info];
 463                                 if (le32_to_cpu(quad->diff) == 0)
 464                                         return SPAN_INVALID;
 465                                 if (le64_to_cpu(quad->logStart) <= row  &&
 466                                         row <= le64_to_cpu(quad->logEnd)  &&
 467                                         (mega_mod64(row - le64_to_cpu(quad->logStart),
 468                                                 le32_to_cpu(quad->diff))) == 0) {
 469                                         if (span_blk != NULL) {
 470                                                 u64  blk;
 471                                                 blk = mega_div64_32
 472                                                     ((row - le64_to_cpu(quad->logStart)),
 473                                                     le32_to_cpu(quad->diff));
 474                                                 blk = (blk + le64_to_cpu(quad->offsetInSpan))
 475                                                          << raid->stripeShift;
 476                                                 *span_blk = blk;
 477                                         }
 478                                         return span;
 479                                 }
 480                         }
 481         }
 482         return SPAN_INVALID;
 483 }
 484
 485 /*
 486 ******************************************************************************
 487 *
 488 * This routine calculates the row for given strip using spanset.
 489 *
 490 * Inputs :
 491 *    instance - HBA instance
 492 *    ld   - Logical drive number
 493 *    Strip        - Strip
 494 *    map    - LD map
 495 *
 496 * Outputs :
 497 *
 498 *    row         - row associated with strip
 499 */
 500
 501 static u64  get_row_from_strip(struct megasas_instance *instance,
 502         u32 ld, u64 strip, struct MR_DRV_RAID_MAP_ALL *map)
 503 {
 504         struct fusion_context *fusion = instance->ctrl_context;
 505         struct MR_LD_RAID       *raid = MR_LdRaidGet(ld, map);
 506         LD_SPAN_SET     *span_set;
 507         PLD_SPAN_INFO   ldSpanInfo = fusion->log_to_span;
 508         u32             info, strip_offset, span, span_offset;
 509         u64             span_set_Strip, span_set_Row, retval;
 510
 511         for (info = 0; info < MAX_QUAD_DEPTH; info++) {
 512                 span_set = &(ldSpanInfo[ld].span_set[info]);
 513
 514                 if (span_set->span_row_data_width == 0)
 515                         break;
 516                 if (strip > span_set->data_strip_end)
 517                         continue;
 518
 519                 span_set_Strip = strip - span_set->data_strip_start;
 520                 strip_offset = mega_mod64(span_set_Strip,
 521                                 span_set->span_row_data_width);
 522                 span_set_Row = mega_div64_32(span_set_Strip,
 523                                 span_set->span_row_data_width) * span_set->diff;
 524                 for (span = 0, span_offset = 0; span < raid->spanDepth; span++)
 525                         if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
 526                                 block_span_info.noElements) >= info+1) {
 527                                 if (strip_offset >=
 528                                         span_set->strip_offset[span])
 529                                         span_offset++;
 530                                 else
 531                                         break;
 532                         }
 533 #if SPAN_DEBUG
 534                 dev_info(&instance->pdev->dev, "Strip 0x%llx,"
 535                         "span_set_Strip 0x%llx, span_set_Row 0x%llx"
 536                         "data width 0x%llx span offset 0x%x\n", strip,
 537                         (unsigned long long)span_set_Strip,
 538                         (unsigned long long)span_set_Row,
 539                         (unsigned long long)span_set->span_row_data_width,
 540                         span_offset);
 541                 dev_info(&instance->pdev->dev, "For strip 0x%llx"
 542                         "row is 0x%llx\n", strip,
 543                         (unsigned long long) span_set->data_row_start +
 544                         (unsigned long long) span_set_Row + (span_offset - 1));
 545 #endif
 546                 retval = (span_set->data_row_start + span_set_Row +
 547                                 (span_offset - 1));
 548                 return retval;
 549         }
 550         return -1LLU;
 551 }
 552
 553
 554 /*
 555 ******************************************************************************
 556 *
 557 * This routine calculates the Start Strip for given row using spanset.
 558 *
 559 * Inputs :
 560 *    instance - HBA instance
 561 *    ld   - Logical drive number
 562 *    row        - Row number
 563 *    map    - LD map
 564 *
 565 * Outputs :
 566 *
 567 *    Strip         - Start strip associated with row
 568 */
 569
 570 static u64 get_strip_from_row(struct megasas_instance *instance,
 571                 u32 ld, u64 row, struct MR_DRV_RAID_MAP_ALL *map)
 572 {
 573         struct fusion_context *fusion = instance->ctrl_context;
 574         struct MR_LD_RAID         *raid = MR_LdRaidGet(ld, map);
 575         LD_SPAN_SET *span_set;
 576         struct MR_QUAD_ELEMENT    *quad;
 577         PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span;
 578         u32    span, info;
 579         u64  strip;
 580
 581         for (info = 0; info < MAX_QUAD_DEPTH; info++) {
 582                 span_set = &(ldSpanInfo[ld].span_set[info]);
 583
 584                 if (span_set->span_row_data_width == 0)
 585                         break;
 586                 if (row > span_set->data_row_end)
 587                         continue;
 588
 589                 for (span = 0; span < raid->spanDepth; span++)
 590                         if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
 591                                 block_span_info.noElements) >= info+1) {
 592                                 quad = &map->raidMap.ldSpanMap[ld].
 593                                         spanBlock[span].block_span_info.quad[info];
 594                                 if (le64_to_cpu(quad->logStart) <= row  &&
 595                                         row <= le64_to_cpu(quad->logEnd)  &&
 596                                         mega_mod64((row - le64_to_cpu(quad->logStart)),
 597                                         le32_to_cpu(quad->diff)) == 0) {
 598                                         strip = mega_div64_32
 599                                                 (((row - span_set->data_row_start)
 600                                                         - le64_to_cpu(quad->logStart)),
 601                                                         le32_to_cpu(quad->diff));
 602                                         strip *= span_set->span_row_data_width;
 603                                         strip += span_set->data_strip_start;
 604                                         strip += span_set->strip_offset[span];
 605                                         return strip;
 606                                 }
 607                         }
 608         }
 609         dev_err(&instance->pdev->dev, "get_strip_from_row"
 610                 "returns invalid strip for ld=%x, row=%lx\n",
 611                 ld, (long unsigned int)row);
 612         return -1;
 613 }
 614
 615 /*
 616 ******************************************************************************
 617 *
 618 * This routine calculates the Physical Arm for given strip using spanset.
 619 *
 620 * Inputs :
 621 *    instance - HBA instance
 622 *    ld   - Logical drive number
 623 *    strip      - Strip
 624 *    map    - LD map
 625 *
 626 * Outputs :
 627 *
 628 *    Phys Arm         - Phys Arm associated with strip
 629 */
 630
 631 static u32 get_arm_from_strip(struct megasas_instance *instance,
 632         u32 ld, u64 strip, struct MR_DRV_RAID_MAP_ALL *map)
 633 {
 634         struct fusion_context *fusion = instance->ctrl_context;
 635         struct MR_LD_RAID         *raid = MR_LdRaidGet(ld, map);
 636         LD_SPAN_SET *span_set;
 637         PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span;
 638         u32    info, strip_offset, span, span_offset, retval;
 639
 640         for (info = 0 ; info < MAX_QUAD_DEPTH; info++) {
 641                 span_set = &(ldSpanInfo[ld].span_set[info]);
 642
 643                 if (span_set->span_row_data_width == 0)
 644                         break;
 645                 if (strip > span_set->data_strip_end)
 646                         continue;
 647
 648                 strip_offset = (uint)mega_mod64
 649                                 ((strip - span_set->data_strip_start),
 650                                 span_set->span_row_data_width);
 651
 652                 for (span = 0, span_offset = 0; span < raid->spanDepth; span++)
 653                         if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
 654                                 block_span_info.noElements) >= info+1) {
 655                                 if (strip_offset >=
 656                                         span_set->strip_offset[span])
 657                                         span_offset =
 658                                                 span_set->strip_offset[span];
 659                                 else
 660                                         break;
 661                         }
 662 #if SPAN_DEBUG
 663                 dev_info(&instance->pdev->dev, "get_arm_from_strip:"
 664                         "for ld=0x%x strip=0x%lx arm is  0x%x\n", ld,
 665                         (long unsigned int)strip, (strip_offset - span_offset));
 666 #endif
 667                 retval = (strip_offset - span_offset);
 668                 return retval;
 669         }
 670
 671         dev_err(&instance->pdev->dev, "get_arm_from_strip"
 672                 "returns invalid arm for ld=%x strip=%lx\n",
 673                 ld, (long unsigned int)strip);
 674
 675         return -1;
 676 }
 677
 678 /* This Function will return Phys arm */
 679 u8 get_arm(struct megasas_instance *instance, u32 ld, u8 span, u64 stripe,
 680                 struct MR_DRV_RAID_MAP_ALL *map)
 681 {
 682         struct MR_LD_RAID  *raid = MR_LdRaidGet(ld, map);
 683         /* Need to check correct default value */
 684         u32    arm = 0;
 685
 686         switch (raid->level) {
 687         case 0:
 688         case 5:
 689         case 6:
 690                 arm = mega_mod64(stripe, SPAN_ROW_SIZE(map, ld, span));
 691                 break;
 692         case 1:
 693                 /* start with logical arm */
 694                 arm = get_arm_from_strip(instance, ld, stripe, map);
 695                 if (arm != -1U)
 696                         arm *= 2;
 697                 break;
 698         }
 699
 700         return arm;
 701 }
 702
 703
 704 /*
 705 ******************************************************************************
 706 *
 707 * This routine calculates the arm, span and block for the specified stripe and
 708 * reference in stripe using spanset
 709 *
 710 * Inputs :
 711 *
 712 *    ld   - Logical drive number
 713 *    stripRow        - Stripe number
 714 *    stripRef    - Reference in stripe
 715 *
 716 * Outputs :
 717 *
 718 *    span          - Span number
 719 *    block         - Absolute Block number in the physical disk
 720 */
 721 static u8 mr_spanset_get_phy_params(struct megasas_instance *instance, u32 ld,
 722                 u64 stripRow, u16 stripRef, struct IO_REQUEST_INFO *io_info,
 723                 struct RAID_CONTEXT *pRAID_Context,
 724                 struct MR_DRV_RAID_MAP_ALL *map)
 725 {
 726         struct MR_LD_RAID  *raid = MR_LdRaidGet(ld, map);
 727         u32     pd, arRef;
 728         u8      physArm, span;
 729         u64     row;
 730         u8      retval = TRUE;
 731         u8      do_invader = 0;
 732         u64     *pdBlock = &io_info->pdBlock;
 733         u16     *pDevHandle = &io_info->devHandle;
 734         u32     logArm, rowMod, armQ, arm;
 735
 736         if ((instance->pdev->device == PCI_DEVICE_ID_LSI_INVADER ||
 737                 instance->pdev->device == PCI_DEVICE_ID_LSI_FURY))
 738                 do_invader = 1;
 739
 740         /*Get row and span from io_info for Uneven Span IO.*/
 741         row         = io_info->start_row;
 742         span        = io_info->start_span;
 743
 744
 745         if (raid->level == 6) {
 746                 logArm = get_arm_from_strip(instance, ld, stripRow, map);
 747                 if (logArm == -1U)
 748                         return FALSE;
 749                 rowMod = mega_mod64(row, SPAN_ROW_SIZE(map, ld, span));
 750                 armQ = SPAN_ROW_SIZE(map, ld, span) - 1 - rowMod;
 751                 arm = armQ + 1 + logArm;
 752                 if (arm >= SPAN_ROW_SIZE(map, ld, span))
 753                         arm -= SPAN_ROW_SIZE(map, ld, span);
 754                 physArm = (u8)arm;
 755         } else
 756                 /* Calculate the arm */
 757                 physArm = get_arm(instance, ld, span, stripRow, map);
 758         if (physArm == 0xFF)
 759                 return FALSE;
 760
 761         arRef       = MR_LdSpanArrayGet(ld, span, map);
 762         pd          = MR_ArPdGet(arRef, physArm, map);
 763
 764         if (pd != MR_PD_INVALID)
 765                 *pDevHandle = MR_PdDevHandleGet(pd, map);
 766         else {
 767                 *pDevHandle = MR_PD_INVALID;
 768                 if ((raid->level >= 5) &&
 769                         (!do_invader  || (do_invader &&
 770                         (raid->regTypeReqOnRead != REGION_TYPE_UNUSED))))
 771                         pRAID_Context->regLockFlags = REGION_TYPE_EXCLUSIVE;
 772                 else if (raid->level == 1) {
 773                         pd = MR_ArPdGet(arRef, physArm + 1, map);
 774                         if (pd != MR_PD_INVALID)
 775                                 *pDevHandle = MR_PdDevHandleGet(pd, map);
 776                 }
 777         }
 778
 779         *pdBlock += stripRef + le64_to_cpu(MR_LdSpanPtrGet(ld, span, map)->startBlk);
 780         pRAID_Context->spanArm = (span << RAID_CTX_SPANARM_SPAN_SHIFT) |
 781                                         physArm;
 782         io_info->span_arm = pRAID_Context->spanArm;
 783         return retval;
 784 }
 785
 786 /*
 787 ******************************************************************************
 788 *
 789 * This routine calculates the arm, span and block for the specified stripe and
 790 * reference in stripe.
 791 *
 792 * Inputs :
 793 *
 794 *    ld   - Logical drive number
 795 *    stripRow        - Stripe number
 796 *    stripRef    - Reference in stripe
 797 *
 798 * Outputs :
 799 *
 800 *    span          - Span number
 801 *    block         - Absolute Block number in the physical disk
 802 */
 803 u8 MR_GetPhyParams(struct megasas_instance *instance, u32 ld, u64 stripRow,
 804                 u16 stripRef, struct IO_REQUEST_INFO *io_info,
 805                 struct RAID_CONTEXT *pRAID_Context,
 806                 struct MR_DRV_RAID_MAP_ALL *map)
 807 {
 808         struct MR_LD_RAID  *raid = MR_LdRaidGet(ld, map);
 809         u32         pd, arRef;
 810         u8          physArm, span;
 811         u64         row;
 812         u8          retval = TRUE;
 813         u8          do_invader = 0;
 814         u64         *pdBlock = &io_info->pdBlock;
 815         u16         *pDevHandle = &io_info->devHandle;
 816
 817         if ((instance->pdev->device == PCI_DEVICE_ID_LSI_INVADER ||
 818                 instance->pdev->device == PCI_DEVICE_ID_LSI_FURY))
 819                 do_invader = 1;
 820
 821         row =  mega_div64_32(stripRow, raid->rowDataSize);
 822
 823         if (raid->level == 6) {
 824                 /* logical arm within row */
 825                 u32 logArm =  mega_mod64(stripRow, raid->rowDataSize);
 826                 u32 rowMod, armQ, arm;
 827
 828                 if (raid->rowSize == 0)
 829                         return FALSE;
 830                 /* get logical row mod */
 831                 rowMod = mega_mod64(row, raid->rowSize);
 832                 armQ = raid->rowSize-1-rowMod; /* index of Q drive */
 833                 arm = armQ+1+logArm; /* data always logically follows Q */
 834                 if (arm >= raid->rowSize) /* handle wrap condition */
 835                         arm -= raid->rowSize;
 836                 physArm = (u8)arm;
 837         } else  {
 838                 if (raid->modFactor == 0)
 839                         return FALSE;
 840                 physArm = MR_LdDataArmGet(ld,  mega_mod64(stripRow,
 841                                                           raid->modFactor),
 842                                           map);
 843         }
 844
 845         if (raid->spanDepth == 1) {
 846                 span = 0;
 847                 *pdBlock = row << raid->stripeShift;
 848         } else {
 849                 span = (u8)MR_GetSpanBlock(ld, row, pdBlock, map);
 850                 if (span == SPAN_INVALID)
 851                         return FALSE;
 852         }
 853
 854         /* Get the array on which this span is present */
 855         arRef       = MR_LdSpanArrayGet(ld, span, map);
 856         pd          = MR_ArPdGet(arRef, physArm, map); /* Get the pd */
 857
 858         if (pd != MR_PD_INVALID)
 859                 /* Get dev handle from Pd. */
 860                 *pDevHandle = MR_PdDevHandleGet(pd, map);
 861         else {
 862                 *pDevHandle = MR_PD_INVALID; /* set dev handle as invalid. */
 863                 if ((raid->level >= 5) &&
 864                         (!do_invader  || (do_invader &&
 865                         (raid->regTypeReqOnRead != REGION_TYPE_UNUSED))))
 866                         pRAID_Context->regLockFlags = REGION_TYPE_EXCLUSIVE;
 867                 else if (raid->level == 1) {
 868                         /* Get alternate Pd. */
 869                         pd = MR_ArPdGet(arRef, physArm + 1, map);
 870                         if (pd != MR_PD_INVALID)
 871                                 /* Get dev handle from Pd */
 872                                 *pDevHandle = MR_PdDevHandleGet(pd, map);
 873                 }
 874         }
 875
 876         *pdBlock += stripRef + le64_to_cpu(MR_LdSpanPtrGet(ld, span, map)->startBlk);
 877         pRAID_Context->spanArm = (span << RAID_CTX_SPANARM_SPAN_SHIFT) |
 878                 physArm;
 879         io_info->span_arm = pRAID_Context->spanArm;
 880         return retval;
 881 }
 882
 883 /*
 884 ******************************************************************************
 885 *
 886 * MR_BuildRaidContext function
 887 *
 888 * This function will initiate command processing.  The start/end row and strip
 889 * information is calculated then the lock is acquired.
 890 * This function will return 0 if region lock was acquired OR return num strips
 891 */
 892 u8
 893 MR_BuildRaidContext(struct megasas_instance *instance,
 894                     struct IO_REQUEST_INFO *io_info,
 895                     struct RAID_CONTEXT *pRAID_Context,
 896                     struct MR_DRV_RAID_MAP_ALL *map, u8 **raidLUN)
 897 {
 898         struct MR_LD_RAID  *raid;
 899         u32         ld, stripSize, stripe_mask;
 900         u64         endLba, endStrip, endRow, start_row, start_strip;
 901         u64         regStart;
 902         u32         regSize;
 903         u8          num_strips, numRows;
 904         u16         ref_in_start_stripe, ref_in_end_stripe;
 905         u64         ldStartBlock;
 906         u32         numBlocks, ldTgtId;
 907         u8          isRead;
 908         u8          retval = 0;
 909         u8          startlba_span = SPAN_INVALID;
 910         u64 *pdBlock = &io_info->pdBlock;
 911
 912         ldStartBlock = io_info->ldStartBlock;
 913         numBlocks = io_info->numBlocks;
 914         ldTgtId = io_info->ldTgtId;
 915         isRead = io_info->isRead;
 916         io_info->IoforUnevenSpan = 0;
 917         io_info->start_span     = SPAN_INVALID;
 918
 919         ld = MR_TargetIdToLdGet(ldTgtId, map);
 920         raid = MR_LdRaidGet(ld, map);
 921
 922         /*
 923          * if rowDataSize @RAID map and spanRowDataSize @SPAN INFO are zero
 924          * return FALSE
 925          */
 926         if (raid->rowDataSize == 0) {
 927                 if (MR_LdSpanPtrGet(ld, 0, map)->spanRowDataSize == 0)
 928                         return FALSE;
 929                 else if (instance->UnevenSpanSupport) {
 930                         io_info->IoforUnevenSpan = 1;
 931                 } else {
 932                         dev_info(&instance->pdev->dev,
 933                                 "raid->rowDataSize is 0, but has SPAN[0]"
 934                                 "rowDataSize = 0x%0x,"
 935                                 "but there is _NO_ UnevenSpanSupport\n",
 936                                 MR_LdSpanPtrGet(ld, 0, map)->spanRowDataSize);
 937                         return FALSE;
 938                 }
 939         }
 940
 941         stripSize = 1 << raid->stripeShift;
 942         stripe_mask = stripSize-1;
 943
 944
 945         /*
 946          * calculate starting row and stripe, and number of strips and rows
 947          */
 948         start_strip         = ldStartBlock >> raid->stripeShift;
 949         ref_in_start_stripe = (u16)(ldStartBlock & stripe_mask);
 950         endLba              = ldStartBlock + numBlocks - 1;
 951         ref_in_end_stripe   = (u16)(endLba & stripe_mask);
 952         endStrip            = endLba >> raid->stripeShift;
 953         num_strips          = (u8)(endStrip - start_strip + 1); /* End strip */
 954
 955         if (io_info->IoforUnevenSpan) {
 956                 start_row = get_row_from_strip(instance, ld, start_strip, map);
 957                 endRow    = get_row_from_strip(instance, ld, endStrip, map);
 958                 if (start_row == -1ULL || endRow == -1ULL) {
 959                         dev_info(&instance->pdev->dev, "return from %s %d."
 960                                 "Send IO w/o region lock.\n",
 961                                 __func__, __LINE__);
 962                         return FALSE;
 963                 }
 964
 965                 if (raid->spanDepth == 1) {
 966                         startlba_span = 0;
 967                         *pdBlock = start_row << raid->stripeShift;
 968                 } else
 969                         startlba_span = (u8)mr_spanset_get_span_block(instance,
 970                                                 ld, start_row, pdBlock, map);
 971                 if (startlba_span == SPAN_INVALID) {
 972                         dev_info(&instance->pdev->dev, "return from %s %d"
 973                                 "for row 0x%llx,start strip %llx"
 974                                 "endSrip %llx\n", __func__, __LINE__,
 975                                 (unsigned long long)start_row,
 976                                 (unsigned long long)start_strip,
 977                                 (unsigned long long)endStrip);
 978                         return FALSE;
 979                 }
 980                 io_info->start_span     = startlba_span;
 981                 io_info->start_row      = start_row;
 982 #if SPAN_DEBUG
 983                 dev_dbg(&instance->pdev->dev, "Check Span number from %s %d"
 984                         "for row 0x%llx, start strip 0x%llx end strip 0x%llx"
 985                         " span 0x%x\n", __func__, __LINE__,
 986                         (unsigned long long)start_row,
 987                         (unsigned long long)start_strip,
 988                         (unsigned long long)endStrip, startlba_span);
 989                 dev_dbg(&instance->pdev->dev, "start_row 0x%llx endRow 0x%llx"
 990                         "Start span 0x%x\n", (unsigned long long)start_row,
 991                         (unsigned long long)endRow, startlba_span);
 992 #endif
 993         } else {
 994                 start_row = mega_div64_32(start_strip, raid->rowDataSize);
 995                 endRow    = mega_div64_32(endStrip, raid->rowDataSize);
 996         }
 997         numRows = (u8)(endRow - start_row + 1);
 998
 999         /*
1000          * calculate region info.
1001          */
1002
1003         /* assume region is at the start of the first row */
1004         regStart            = start_row << raid->stripeShift;
1005         /* assume this IO needs the full row - we'll adjust if not true */
1006         regSize             = stripSize;
1007
1008         /* Check if we can send this I/O via FastPath */
1009         if (raid->capability.fpCapable) {
1010                 if (isRead)
1011                         io_info->fpOkForIo = (raid->capability.fpReadCapable &&
1012                                               ((num_strips == 1) ||
1013                                                raid->capability.
1014                                                fpReadAcrossStripe));
1015                 else
1016                         io_info->fpOkForIo = (raid->capability.fpWriteCapable &&
1017                                               ((num_strips == 1) ||
1018                                                raid->capability.
1019                                                fpWriteAcrossStripe));
1020         } else
1021                 io_info->fpOkForIo = FALSE;
1022
1023         if (numRows == 1) {
1024                 /* single-strip IOs can always lock only the data needed */
1025                 if (num_strips == 1) {
1026                         regStart += ref_in_start_stripe;
1027                         regSize = numBlocks;
1028                 }
1029                 /* multi-strip IOs always need to full stripe locked */
1030         } else if (io_info->IoforUnevenSpan == 0) {
1031                 /*
1032                  * For Even span region lock optimization.
1033                  * If the start strip is the last in the start row
1034                  */
1035                 if (start_strip == (start_row + 1) * raid->rowDataSize - 1) {
1036                         regStart += ref_in_start_stripe;
1037                         /* initialize count to sectors from startref to end
1038                            of strip */
1039                         regSize = stripSize - ref_in_start_stripe;
1040                 }
1041
1042                 /* add complete rows in the middle of the transfer */
1043                 if (numRows > 2)
1044                         regSize += (numRows-2) << raid->stripeShift;
1045
1046                 /* if IO ends within first strip of last row*/
1047                 if (endStrip == endRow*raid->rowDataSize)
1048                         regSize += ref_in_end_stripe+1;
1049                 else
1050                         regSize += stripSize;
1051         } else {
1052                 /*
1053                  * For Uneven span region lock optimization.
1054                  * If the start strip is the last in the start row
1055                  */
1056                 if (start_strip == (get_strip_from_row(instance, ld, start_row, map) +
1057                                 SPAN_ROW_DATA_SIZE(map, ld, startlba_span) - 1)) {
1058                         regStart += ref_in_start_stripe;
1059                         /* initialize count to sectors from
1060                          * startRef to end of strip
1061                          */
1062                         regSize = stripSize - ref_in_start_stripe;
1063                 }
1064                 /* Add complete rows in the middle of the transfer*/
1065
1066                 if (numRows > 2)
1067                         /* Add complete rows in the middle of the transfer*/
1068                         regSize += (numRows-2) << raid->stripeShift;
1069
1070                 /* if IO ends within first strip of last row */
1071                 if (endStrip == get_strip_from_row(instance, ld, endRow, map))
1072                         regSize += ref_in_end_stripe + 1;
1073                 else
1074                         regSize += stripSize;
1075         }
1076
1077         pRAID_Context->timeoutValue =
1078                 cpu_to_le16(raid->fpIoTimeoutForLd ?
1079                             raid->fpIoTimeoutForLd :
1080                             map->raidMap.fpPdIoTimeoutSec);
1081         if ((instance->pdev->device == PCI_DEVICE_ID_LSI_INVADER) ||
1082                 (instance->pdev->device == PCI_DEVICE_ID_LSI_FURY))
1083                 pRAID_Context->regLockFlags = (isRead) ?
1084                         raid->regTypeReqOnRead : raid->regTypeReqOnWrite;
1085         else
1086                 pRAID_Context->regLockFlags = (isRead) ?
1087                         REGION_TYPE_SHARED_READ : raid->regTypeReqOnWrite;
1088         pRAID_Context->VirtualDiskTgtId = raid->targetId;
1089         pRAID_Context->regLockRowLBA    = cpu_to_le64(regStart);
1090         pRAID_Context->regLockLength    = cpu_to_le32(regSize);
1091         pRAID_Context->configSeqNum     = raid->seqNum;
1092         /* save pointer to raid->LUN array */
1093         *raidLUN = raid->LUN;
1094
1095
1096         /*Get Phy Params only if FP capable, or else leave it to MR firmware
1097           to do the calculation.*/
1098         if (io_info->fpOkForIo) {
1099                 retval = io_info->IoforUnevenSpan ?
1100                                 mr_spanset_get_phy_params(instance, ld,
1101                                         start_strip, ref_in_start_stripe,
1102                                         io_info, pRAID_Context, map) :
1103                                 MR_GetPhyParams(instance, ld, start_strip,
1104                                         ref_in_start_stripe, io_info,
1105                                         pRAID_Context, map);
1106                 /* If IO on an invalid Pd, then FP is not possible.*/
1107                 if (io_info->devHandle == MR_PD_INVALID)
1108                         io_info->fpOkForIo = FALSE;
1109                 return retval;
1110         } else if (isRead) {
1111                 uint stripIdx;
1112                 for (stripIdx = 0; stripIdx < num_strips; stripIdx++) {
1113                         retval = io_info->IoforUnevenSpan ?
1114                                 mr_spanset_get_phy_params(instance, ld,
1115                                     start_strip + stripIdx,
1116                                     ref_in_start_stripe, io_info,
1117                                     pRAID_Context, map) :
1118                                 MR_GetPhyParams(instance, ld,
1119                                     start_strip + stripIdx, ref_in_start_stripe,
1120                                     io_info, pRAID_Context, map);
1121                         if (!retval)
1122                                 return TRUE;
1123                 }
1124         }
1125
1126 #if SPAN_DEBUG
1127         /* Just for testing what arm we get for strip.*/
1128         if (io_info->IoforUnevenSpan)
1129                 get_arm_from_strip(instance, ld, start_strip, map);
1130 #endif
1131         return TRUE;
1132 }
1133
1134 /*
1135 ******************************************************************************
1136 *
1137 * This routine pepare spanset info from Valid Raid map and store it into
1138 * local copy of ldSpanInfo per instance data structure.
1139 *
1140 * Inputs :
1141 * map    - LD map
1142 * ldSpanInfo - ldSpanInfo per HBA instance
1143 *
1144 */
1145 void mr_update_span_set(struct MR_DRV_RAID_MAP_ALL *map,
1146         PLD_SPAN_INFO ldSpanInfo)
1147 {
1148         u8   span, count;
1149         u32  element, span_row_width;
1150         u64  span_row;
1151         struct MR_LD_RAID *raid;
1152         LD_SPAN_SET *span_set, *span_set_prev;
1153         struct MR_QUAD_ELEMENT    *quad;
1154         int ldCount;
1155         u16 ld;
1156
1157
1158         for (ldCount = 0; ldCount < MAX_LOGICAL_DRIVES_EXT; ldCount++) {
1159                 ld = MR_TargetIdToLdGet(ldCount, map);
1160                 if (ld >= MAX_LOGICAL_DRIVES_EXT)
1161                         continue;
1162                 raid = MR_LdRaidGet(ld, map);
1163                 for (element = 0; element < MAX_QUAD_DEPTH; element++) {
1164                         for (span = 0; span < raid->spanDepth; span++) {
1165                                 if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
1166                                         block_span_info.noElements) <
1167                                         element + 1)
1168                                         continue;
1169                                 span_set = &(ldSpanInfo[ld].span_set[element]);
1170                                 quad = &map->raidMap.ldSpanMap[ld].
1171                                         spanBlock[span].block_span_info.
1172                                         quad[element];
1173
1174                                 span_set->diff = le32_to_cpu(quad->diff);
1175
1176                                 for (count = 0, span_row_width = 0;
1177                                         count < raid->spanDepth; count++) {
1178                                         if (le32_to_cpu(map->raidMap.ldSpanMap[ld].
1179                                                 spanBlock[count].
1180                                                 block_span_info.
1181                                                 noElements) >= element + 1) {
1182                                                 span_set->strip_offset[count] =
1183                                                         span_row_width;
1184                                                 span_row_width +=
1185                                                         MR_LdSpanPtrGet
1186                                                         (ld, count, map)->spanRowDataSize;
1187                                                 printk(KERN_INFO "megasas:"
1188                                                         "span %x rowDataSize %x\n",
1189                                                         count, MR_LdSpanPtrGet
1190                                                         (ld, count, map)->spanRowDataSize);
1191                                         }
1192                                 }
1193
1194                                 span_set->span_row_data_width = span_row_width;
1195                                 span_row = mega_div64_32(((le64_to_cpu(quad->logEnd) -
1196                                         le64_to_cpu(quad->logStart)) + le32_to_cpu(quad->diff)),
1197                                         le32_to_cpu(quad->diff));
1198
1199                                 if (element == 0) {
1200                                         span_set->log_start_lba = 0;
1201                                         span_set->log_end_lba =
1202                                                 ((span_row << raid->stripeShift)
1203                                                 * span_row_width) - 1;
1204
1205                                         span_set->span_row_start = 0;
1206                                         span_set->span_row_end = span_row - 1;
1207
1208                                         span_set->data_strip_start = 0;
1209                                         span_set->data_strip_end =
1210                                                 (span_row * span_row_width) - 1;
1211
1212                                         span_set->data_row_start = 0;
1213                                         span_set->data_row_end =
1214                                                 (span_row * le32_to_cpu(quad->diff)) - 1;
1215                                 } else {
1216                                         span_set_prev = &(ldSpanInfo[ld].
1217                                                         span_set[element - 1]);
1218                                         span_set->log_start_lba =
1219                                                 span_set_prev->log_end_lba + 1;
1220                                         span_set->log_end_lba =
1221                                                 span_set->log_start_lba +
1222                                                 ((span_row << raid->stripeShift)
1223                                                 * span_row_width) - 1;
1224
1225                                         span_set->span_row_start =
1226                                                 span_set_prev->span_row_end + 1;
1227                                         span_set->span_row_end =
1228                                         span_set->span_row_start + span_row - 1;
1229
1230                                         span_set->data_strip_start =
1231                                         span_set_prev->data_strip_end + 1;
1232                                         span_set->data_strip_end =
1233                                                 span_set->data_strip_start +
1234                                                 (span_row * span_row_width) - 1;
1235
1236                                         span_set->data_row_start =
1237                                                 span_set_prev->data_row_end + 1;
1238                                         span_set->data_row_end =
1239                                                 span_set->data_row_start +
1240                                                 (span_row * le32_to_cpu(quad->diff)) - 1;
1241                                 }
1242                                 break;
1243                 }
1244                 if (span == raid->spanDepth)
1245                         break;
1246             }
1247         }
1248 #if SPAN_DEBUG
1249         getSpanInfo(map, ldSpanInfo);
1250 #endif
1251
1252 }
1253
1254 void mr_update_load_balance_params(struct MR_DRV_RAID_MAP_ALL *drv_map,
1255         struct LD_LOAD_BALANCE_INFO *lbInfo)
1256 {
1257         int ldCount;
1258         u16 ld;
1259         struct MR_LD_RAID *raid;
1260
1261         if (lb_pending_cmds > 128 || lb_pending_cmds < 1)
1262                 lb_pending_cmds = LB_PENDING_CMDS_DEFAULT;
1263
1264         for (ldCount = 0; ldCount < MAX_LOGICAL_DRIVES_EXT; ldCount++) {
1265                 ld = MR_TargetIdToLdGet(ldCount, drv_map);
1266                 if (ld >= MAX_LOGICAL_DRIVES_EXT) {
1267                         lbInfo[ldCount].loadBalanceFlag = 0;
1268                         continue;
1269                 }
1270
1271                 raid = MR_LdRaidGet(ld, drv_map);
1272                 if ((raid->level != 1) ||
1273                         (raid->ldState != MR_LD_STATE_OPTIMAL)) {
1274                         lbInfo[ldCount].loadBalanceFlag = 0;
1275                         continue;
1276                 }
1277                 lbInfo[ldCount].loadBalanceFlag = 1;
1278         }
1279 }
1280
1281 u8 megasas_get_best_arm_pd(struct megasas_instance *instance,
1282         struct LD_LOAD_BALANCE_INFO *lbInfo, struct IO_REQUEST_INFO *io_info)
1283 {
1284         struct fusion_context *fusion;
1285         struct MR_LD_RAID  *raid;
1286         struct MR_DRV_RAID_MAP_ALL *drv_map;
1287         u16     pend0, pend1, ld;
1288         u64     diff0, diff1;
1289         u8      bestArm, pd0, pd1, span, arm;
1290         u32     arRef, span_row_size;
1291
1292         u64 block = io_info->ldStartBlock;
1293         u32 count = io_info->numBlocks;
1294
1295         span = ((io_info->span_arm & RAID_CTX_SPANARM_SPAN_MASK)
1296                         >> RAID_CTX_SPANARM_SPAN_SHIFT);
1297         arm = (io_info->span_arm & RAID_CTX_SPANARM_ARM_MASK);
1298
1299
1300         fusion = instance->ctrl_context;
1301         drv_map = fusion->ld_drv_map[(instance->map_id & 1)];
1302         ld = MR_TargetIdToLdGet(io_info->ldTgtId, drv_map);
1303         raid = MR_LdRaidGet(ld, drv_map);
1304         span_row_size = instance->UnevenSpanSupport ?
1305                         SPAN_ROW_SIZE(drv_map, ld, span) : raid->rowSize;
1306
1307         arRef = MR_LdSpanArrayGet(ld, span, drv_map);
1308         pd0 = MR_ArPdGet(arRef, arm, drv_map);
1309         pd1 = MR_ArPdGet(arRef, (arm + 1) >= span_row_size ?
1310                 (arm + 1 - span_row_size) : arm + 1, drv_map);
1311
1312         /* get the pending cmds for the data and mirror arms */
1313         pend0 = atomic_read(&lbInfo->scsi_pending_cmds[pd0]);
1314         pend1 = atomic_read(&lbInfo->scsi_pending_cmds[pd1]);
1315
1316         /* Determine the disk whose head is nearer to the req. block */
1317         diff0 = ABS_DIFF(block, lbInfo->last_accessed_block[pd0]);
1318         diff1 = ABS_DIFF(block, lbInfo->last_accessed_block[pd1]);
1319         bestArm = (diff0 <= diff1 ? arm : arm ^ 1);
1320
1321         if ((bestArm == arm && pend0 > pend1 + lb_pending_cmds)  ||
1322                         (bestArm != arm && pend1 > pend0 + lb_pending_cmds))
1323                 bestArm ^= 1;
1324
1325         /* Update the last accessed block on the correct pd */
1326         io_info->pd_after_lb = (bestArm == arm) ? pd0 : pd1;
1327         lbInfo->last_accessed_block[io_info->pd_after_lb] = block + count - 1;
1328         io_info->span_arm = (span << RAID_CTX_SPANARM_SPAN_SHIFT) | bestArm;
1329 #if SPAN_DEBUG
1330         if (arm != bestArm)
1331                 dev_dbg(&instance->pdev->dev, "LSI Debug R1 Load balance "
1332                         "occur - span 0x%x arm 0x%x bestArm 0x%x "
1333                         "io_info->span_arm 0x%x\n",
1334                         span, arm, bestArm, io_info->span_arm);
1335 #endif
1336         return io_info->pd_after_lb;
1337 }
1338
1339 u16 get_updated_dev_handle(struct megasas_instance *instance,
1340         struct LD_LOAD_BALANCE_INFO *lbInfo, struct IO_REQUEST_INFO *io_info)
1341 {
1342         u8 arm_pd;
1343         u16 devHandle;
1344         struct fusion_context *fusion;
1345         struct MR_DRV_RAID_MAP_ALL *drv_map;
1346
1347         fusion = instance->ctrl_context;
1348         drv_map = fusion->ld_drv_map[(instance->map_id & 1)];
1349
1350         /* get best new arm (PD ID) */
1351         arm_pd  = megasas_get_best_arm_pd(instance, lbInfo, io_info);
1352         devHandle = MR_PdDevHandleGet(arm_pd, drv_map);
1353         atomic_inc(&lbInfo->scsi_pending_cmds[arm_pd]);
1354         return devHandle;
1355 }