1 /* 2 * Linux MegaRAID driver for SAS based RAID controllers 3 * 4 * Copyright (c) 2009-2012 LSI Corporation. 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * as published by the Free Software Foundation; either version 2 9 * of the License, or (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 * 20 * FILE: megaraid_sas_fp.c 21 * 22 * Authors: LSI Corporation 23 * Sumant Patro 24 * Varad Talamacki 25 * Manoj Jose 26 * 27 * Send feedback to: <megaraidlinux@lsi.com> 28 * 29 * Mail to: LSI Corporation, 1621 Barber Lane, Milpitas, CA 95035 30 * ATTN: Linuxraid 31 */ 32 33 #include <linux/kernel.h> 34 #include <linux/types.h> 35 #include <linux/pci.h> 36 #include <linux/list.h> 37 #include <linux/moduleparam.h> 38 #include <linux/module.h> 39 #include <linux/spinlock.h> 40 #include <linux/interrupt.h> 41 #include <linux/delay.h> 42 #include <linux/uio.h> 43 #include <linux/uaccess.h> 44 #include <linux/fs.h> 45 #include <linux/compat.h> 46 #include <linux/blkdev.h> 47 #include <linux/poll.h> 48 49 #include <scsi/scsi.h> 50 #include <scsi/scsi_cmnd.h> 51 #include <scsi/scsi_device.h> 52 #include <scsi/scsi_host.h> 53 54 #include "megaraid_sas_fusion.h" 55 #include "megaraid_sas.h" 56 #include <asm/div64.h> 57 58 #define ABS_DIFF(a, b) (((a) > (b)) ? ((a) - (b)) : ((b) - (a))) 59 #define MR_LD_STATE_OPTIMAL 3 60 #define FALSE 0 61 #define TRUE 1 62 63 #define SPAN_DEBUG 0 64 #define SPAN_ROW_SIZE(map, ld, index_) (MR_LdSpanPtrGet(ld, index_, map)->spanRowSize) 65 #define SPAN_ROW_DATA_SIZE(map_, ld, index_) (MR_LdSpanPtrGet(ld, index_, map)->spanRowDataSize) 66 #define SPAN_INVALID 0xff 67 68 /* Prototypes */ 69 void mr_update_load_balance_params(struct MR_FW_RAID_MAP_ALL *map, 70 struct LD_LOAD_BALANCE_INFO *lbInfo); 71 72 static void mr_update_span_set(struct MR_FW_RAID_MAP_ALL *map, 73 PLD_SPAN_INFO ldSpanInfo); 74 static u8 mr_spanset_get_phy_params(struct megasas_instance *instance, u32 ld, 75 u64 stripRow, u16 stripRef, struct IO_REQUEST_INFO *io_info, 76 struct RAID_CONTEXT *pRAID_Context, struct MR_FW_RAID_MAP_ALL *map); 77 static u64 get_row_from_strip(struct megasas_instance *instance, u32 ld, 78 u64 strip, struct MR_FW_RAID_MAP_ALL *map); 79 80 u32 mega_mod64(u64 dividend, u32 divisor) 81 { 82 u64 d; 83 u32 remainder; 84 85 if (!divisor) 86 printk(KERN_ERR "megasas : DIVISOR is zero, in div fn\n"); 87 d = dividend; 88 remainder = do_div(d, divisor); 89 return remainder; 90 } 91 92 /** 93 * @param dividend : Dividend 94 * @param divisor : Divisor 95 * 96 * @return quotient 97 **/ 98 u64 mega_div64_32(uint64_t dividend, uint32_t divisor) 99 { 100 u32 remainder; 101 u64 d; 102 103 if (!divisor) 104 printk(KERN_ERR "megasas : DIVISOR is zero in mod fn\n"); 105 106 d = dividend; 107 remainder = do_div(d, divisor); 108 109 return d; 110 } 111 112 struct MR_LD_RAID *MR_LdRaidGet(u32 ld, struct MR_FW_RAID_MAP_ALL *map) 113 { 114 return &map->raidMap.ldSpanMap[ld].ldRaid; 115 } 116 117 static struct MR_SPAN_BLOCK_INFO *MR_LdSpanInfoGet(u32 ld, 118 struct MR_FW_RAID_MAP_ALL 119 *map) 120 { 121 return &map->raidMap.ldSpanMap[ld].spanBlock[0]; 122 } 123 124 static u8 MR_LdDataArmGet(u32 ld, u32 armIdx, struct MR_FW_RAID_MAP_ALL *map) 125 { 126 return map->raidMap.ldSpanMap[ld].dataArmMap[armIdx]; 127 } 128 129 static u16 MR_ArPdGet(u32 ar, u32 arm, struct MR_FW_RAID_MAP_ALL *map) 130 { 131 return map->raidMap.arMapInfo[ar].pd[arm]; 132 } 133 134 static u16 MR_LdSpanArrayGet(u32 ld, u32 span, struct MR_FW_RAID_MAP_ALL *map) 135 { 136 return map->raidMap.ldSpanMap[ld].spanBlock[span].span.arrayRef; 137 } 138 139 static u16 MR_PdDevHandleGet(u32 pd, struct MR_FW_RAID_MAP_ALL *map) 140 { 141 return map->raidMap.devHndlInfo[pd].curDevHdl; 142 } 143 144 u16 MR_GetLDTgtId(u32 ld, struct MR_FW_RAID_MAP_ALL *map) 145 { 146 return map->raidMap.ldSpanMap[ld].ldRaid.targetId; 147 } 148 149 u16 MR_TargetIdToLdGet(u32 ldTgtId, struct MR_FW_RAID_MAP_ALL *map) 150 { 151 return map->raidMap.ldTgtIdToLd[ldTgtId]; 152 } 153 154 static struct MR_LD_SPAN *MR_LdSpanPtrGet(u32 ld, u32 span, 155 struct MR_FW_RAID_MAP_ALL *map) 156 { 157 return &map->raidMap.ldSpanMap[ld].spanBlock[span].span; 158 } 159 160 /* 161 * This function will validate Map info data provided by FW 162 */ 163 u8 MR_ValidateMapInfo(struct megasas_instance *instance) 164 { 165 struct fusion_context *fusion = instance->ctrl_context; 166 struct MR_FW_RAID_MAP_ALL *map = fusion->ld_map[(instance->map_id & 1)]; 167 struct LD_LOAD_BALANCE_INFO *lbInfo = fusion->load_balance_info; 168 PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span; 169 struct MR_FW_RAID_MAP *pFwRaidMap = &map->raidMap; 170 171 if (pFwRaidMap->totalSize != 172 (sizeof(struct MR_FW_RAID_MAP) -sizeof(struct MR_LD_SPAN_MAP) + 173 (sizeof(struct MR_LD_SPAN_MAP) *pFwRaidMap->ldCount))) { 174 printk(KERN_ERR "megasas: map info structure size 0x%x is not matching with ld count\n", 175 (unsigned int)((sizeof(struct MR_FW_RAID_MAP) - 176 sizeof(struct MR_LD_SPAN_MAP)) + 177 (sizeof(struct MR_LD_SPAN_MAP) * 178 pFwRaidMap->ldCount))); 179 printk(KERN_ERR "megasas: span map %x, pFwRaidMap->totalSize " 180 ": %x\n", (unsigned int)sizeof(struct MR_LD_SPAN_MAP), 181 pFwRaidMap->totalSize); 182 return 0; 183 } 184 185 if (instance->UnevenSpanSupport) 186 mr_update_span_set(map, ldSpanInfo); 187 188 mr_update_load_balance_params(map, lbInfo); 189 190 return 1; 191 } 192 193 u32 MR_GetSpanBlock(u32 ld, u64 row, u64 *span_blk, 194 struct MR_FW_RAID_MAP_ALL *map) 195 { 196 struct MR_SPAN_BLOCK_INFO *pSpanBlock = MR_LdSpanInfoGet(ld, map); 197 struct MR_QUAD_ELEMENT *quad; 198 struct MR_LD_RAID *raid = MR_LdRaidGet(ld, map); 199 u32 span, j; 200 201 for (span = 0; span < raid->spanDepth; span++, pSpanBlock++) { 202 203 for (j = 0; j < pSpanBlock->block_span_info.noElements; j++) { 204 quad = &pSpanBlock->block_span_info.quad[j]; 205 206 if (quad->diff == 0) 207 return SPAN_INVALID; 208 if (quad->logStart <= row && row <= quad->logEnd && 209 (mega_mod64(row-quad->logStart, quad->diff)) == 0) { 210 if (span_blk != NULL) { 211 u64 blk, debugBlk; 212 blk = 213 mega_div64_32( 214 (row-quad->logStart), 215 quad->diff); 216 debugBlk = blk; 217 218 blk = (blk + quad->offsetInSpan) << 219 raid->stripeShift; 220 *span_blk = blk; 221 } 222 return span; 223 } 224 } 225 } 226 return SPAN_INVALID; 227 } 228 229 /* 230 ****************************************************************************** 231 * 232 * Function to print info about span set created in driver from FW raid map 233 * 234 * Inputs : 235 * map - LD map 236 * ldSpanInfo - ldSpanInfo per HBA instance 237 */ 238 #if SPAN_DEBUG 239 static int getSpanInfo(struct MR_FW_RAID_MAP_ALL *map, PLD_SPAN_INFO ldSpanInfo) 240 { 241 242 u8 span; 243 u32 element; 244 struct MR_LD_RAID *raid; 245 LD_SPAN_SET *span_set; 246 struct MR_QUAD_ELEMENT *quad; 247 int ldCount; 248 u16 ld; 249 250 for (ldCount = 0; ldCount < MAX_LOGICAL_DRIVES; ldCount++) { 251 ld = MR_TargetIdToLdGet(ldCount, map); 252 if (ld >= MAX_LOGICAL_DRIVES) 253 continue; 254 raid = MR_LdRaidGet(ld, map); 255 dev_dbg(&instance->pdev->dev, "LD %x: span_depth=%x\n", 256 ld, raid->spanDepth); 257 for (span = 0; span < raid->spanDepth; span++) 258 dev_dbg(&instance->pdev->dev, "Span=%x," 259 " number of quads=%x\n", span, 260 map->raidMap.ldSpanMap[ld].spanBlock[span]. 261 block_span_info.noElements); 262 for (element = 0; element < MAX_QUAD_DEPTH; element++) { 263 span_set = &(ldSpanInfo[ld].span_set[element]); 264 if (span_set->span_row_data_width == 0) 265 break; 266 267 dev_dbg(&instance->pdev->dev, "Span Set %x:" 268 "width=%x, diff=%x\n", element, 269 (unsigned int)span_set->span_row_data_width, 270 (unsigned int)span_set->diff); 271 dev_dbg(&instance->pdev->dev, "logical LBA" 272 "start=0x%08lx, end=0x%08lx\n", 273 (long unsigned int)span_set->log_start_lba, 274 (long unsigned int)span_set->log_end_lba); 275 dev_dbg(&instance->pdev->dev, "span row start=0x%08lx," 276 " end=0x%08lx\n", 277 (long unsigned int)span_set->span_row_start, 278 (long unsigned int)span_set->span_row_end); 279 dev_dbg(&instance->pdev->dev, "data row start=0x%08lx," 280 " end=0x%08lx\n", 281 (long unsigned int)span_set->data_row_start, 282 (long unsigned int)span_set->data_row_end); 283 dev_dbg(&instance->pdev->dev, "data strip start=0x%08lx," 284 " end=0x%08lx\n", 285 (long unsigned int)span_set->data_strip_start, 286 (long unsigned int)span_set->data_strip_end); 287 288 for (span = 0; span < raid->spanDepth; span++) { 289 if (map->raidMap.ldSpanMap[ld].spanBlock[span]. 290 block_span_info.noElements >= 291 element + 1) { 292 quad = &map->raidMap.ldSpanMap[ld]. 293 spanBlock[span].block_span_info. 294 quad[element]; 295 dev_dbg(&instance->pdev->dev, "Span=%x," 296 "Quad=%x, diff=%x\n", span, 297 element, quad->diff); 298 dev_dbg(&instance->pdev->dev, 299 "offset_in_span=0x%08lx\n", 300 (long unsigned int)quad->offsetInSpan); 301 dev_dbg(&instance->pdev->dev, 302 "logical start=0x%08lx, end=0x%08lx\n", 303 (long unsigned int)quad->logStart, 304 (long unsigned int)quad->logEnd); 305 } 306 } 307 } 308 } 309 return 0; 310 } 311 #endif 312 313 /* 314 ****************************************************************************** 315 * 316 * This routine calculates the Span block for given row using spanset. 317 * 318 * Inputs : 319 * instance - HBA instance 320 * ld - Logical drive number 321 * row - Row number 322 * map - LD map 323 * 324 * Outputs : 325 * 326 * span - Span number 327 * block - Absolute Block number in the physical disk 328 * div_error - Devide error code. 329 */ 330 331 u32 mr_spanset_get_span_block(struct megasas_instance *instance, 332 u32 ld, u64 row, u64 *span_blk, struct MR_FW_RAID_MAP_ALL *map) 333 { 334 struct fusion_context *fusion = instance->ctrl_context; 335 struct MR_LD_RAID *raid = MR_LdRaidGet(ld, map); 336 LD_SPAN_SET *span_set; 337 struct MR_QUAD_ELEMENT *quad; 338 u32 span, info; 339 PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span; 340 341 for (info = 0; info < MAX_QUAD_DEPTH; info++) { 342 span_set = &(ldSpanInfo[ld].span_set[info]); 343 344 if (span_set->span_row_data_width == 0) 345 break; 346 347 if (row > span_set->data_row_end) 348 continue; 349 350 for (span = 0; span < raid->spanDepth; span++) 351 if (map->raidMap.ldSpanMap[ld].spanBlock[span]. 352 block_span_info.noElements >= info+1) { 353 quad = &map->raidMap.ldSpanMap[ld]. 354 spanBlock[span]. 355 block_span_info.quad[info]; 356 if (quad->diff == 0) 357 return SPAN_INVALID; 358 if (quad->logStart <= row && 359 row <= quad->logEnd && 360 (mega_mod64(row - quad->logStart, 361 quad->diff)) == 0) { 362 if (span_blk != NULL) { 363 u64 blk; 364 blk = mega_div64_32 365 ((row - quad->logStart), 366 quad->diff); 367 blk = (blk + quad->offsetInSpan) 368 << raid->stripeShift; 369 *span_blk = blk; 370 } 371 return span; 372 } 373 } 374 } 375 return SPAN_INVALID; 376 } 377 378 /* 379 ****************************************************************************** 380 * 381 * This routine calculates the row for given strip using spanset. 382 * 383 * Inputs : 384 * instance - HBA instance 385 * ld - Logical drive number 386 * Strip - Strip 387 * map - LD map 388 * 389 * Outputs : 390 * 391 * row - row associated with strip 392 */ 393 394 static u64 get_row_from_strip(struct megasas_instance *instance, 395 u32 ld, u64 strip, struct MR_FW_RAID_MAP_ALL *map) 396 { 397 struct fusion_context *fusion = instance->ctrl_context; 398 struct MR_LD_RAID *raid = MR_LdRaidGet(ld, map); 399 LD_SPAN_SET *span_set; 400 PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span; 401 u32 info, strip_offset, span, span_offset; 402 u64 span_set_Strip, span_set_Row, retval; 403 404 for (info = 0; info < MAX_QUAD_DEPTH; info++) { 405 span_set = &(ldSpanInfo[ld].span_set[info]); 406 407 if (span_set->span_row_data_width == 0) 408 break; 409 if (strip > span_set->data_strip_end) 410 continue; 411 412 span_set_Strip = strip - span_set->data_strip_start; 413 strip_offset = mega_mod64(span_set_Strip, 414 span_set->span_row_data_width); 415 span_set_Row = mega_div64_32(span_set_Strip, 416 span_set->span_row_data_width) * span_set->diff; 417 for (span = 0, span_offset = 0; span < raid->spanDepth; span++) 418 if (map->raidMap.ldSpanMap[ld].spanBlock[span]. 419 block_span_info.noElements >= info+1) { 420 if (strip_offset >= 421 span_set->strip_offset[span]) 422 span_offset++; 423 else 424 break; 425 } 426 #if SPAN_DEBUG 427 dev_info(&instance->pdev->dev, "Strip 0x%llx," 428 "span_set_Strip 0x%llx, span_set_Row 0x%llx" 429 "data width 0x%llx span offset 0x%x\n", strip, 430 (unsigned long long)span_set_Strip, 431 (unsigned long long)span_set_Row, 432 (unsigned long long)span_set->span_row_data_width, 433 span_offset); 434 dev_info(&instance->pdev->dev, "For strip 0x%llx" 435 "row is 0x%llx\n", strip, 436 (unsigned long long) span_set->data_row_start + 437 (unsigned long long) span_set_Row + (span_offset - 1)); 438 #endif 439 retval = (span_set->data_row_start + span_set_Row + 440 (span_offset - 1)); 441 return retval; 442 } 443 return -1LLU; 444 } 445 446 447 /* 448 ****************************************************************************** 449 * 450 * This routine calculates the Start Strip for given row using spanset. 451 * 452 * Inputs : 453 * instance - HBA instance 454 * ld - Logical drive number 455 * row - Row number 456 * map - LD map 457 * 458 * Outputs : 459 * 460 * Strip - Start strip associated with row 461 */ 462 463 static u64 get_strip_from_row(struct megasas_instance *instance, 464 u32 ld, u64 row, struct MR_FW_RAID_MAP_ALL *map) 465 { 466 struct fusion_context *fusion = instance->ctrl_context; 467 struct MR_LD_RAID *raid = MR_LdRaidGet(ld, map); 468 LD_SPAN_SET *span_set; 469 struct MR_QUAD_ELEMENT *quad; 470 PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span; 471 u32 span, info; 472 u64 strip; 473 474 for (info = 0; info < MAX_QUAD_DEPTH; info++) { 475 span_set = &(ldSpanInfo[ld].span_set[info]); 476 477 if (span_set->span_row_data_width == 0) 478 break; 479 if (row > span_set->data_row_end) 480 continue; 481 482 for (span = 0; span < raid->spanDepth; span++) 483 if (map->raidMap.ldSpanMap[ld].spanBlock[span]. 484 block_span_info.noElements >= info+1) { 485 quad = &map->raidMap.ldSpanMap[ld]. 486 spanBlock[span].block_span_info.quad[info]; 487 if (quad->logStart <= row && 488 row <= quad->logEnd && 489 mega_mod64((row - quad->logStart), 490 quad->diff) == 0) { 491 strip = mega_div64_32 492 (((row - span_set->data_row_start) 493 - quad->logStart), 494 quad->diff); 495 strip *= span_set->span_row_data_width; 496 strip += span_set->data_strip_start; 497 strip += span_set->strip_offset[span]; 498 return strip; 499 } 500 } 501 } 502 dev_err(&instance->pdev->dev, "get_strip_from_row" 503 "returns invalid strip for ld=%x, row=%lx\n", 504 ld, (long unsigned int)row); 505 return -1; 506 } 507 508 /* 509 ****************************************************************************** 510 * 511 * This routine calculates the Physical Arm for given strip using spanset. 512 * 513 * Inputs : 514 * instance - HBA instance 515 * ld - Logical drive number 516 * strip - Strip 517 * map - LD map 518 * 519 * Outputs : 520 * 521 * Phys Arm - Phys Arm associated with strip 522 */ 523 524 static u32 get_arm_from_strip(struct megasas_instance *instance, 525 u32 ld, u64 strip, struct MR_FW_RAID_MAP_ALL *map) 526 { 527 struct fusion_context *fusion = instance->ctrl_context; 528 struct MR_LD_RAID *raid = MR_LdRaidGet(ld, map); 529 LD_SPAN_SET *span_set; 530 PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span; 531 u32 info, strip_offset, span, span_offset, retval; 532 533 for (info = 0 ; info < MAX_QUAD_DEPTH; info++) { 534 span_set = &(ldSpanInfo[ld].span_set[info]); 535 536 if (span_set->span_row_data_width == 0) 537 break; 538 if (strip > span_set->data_strip_end) 539 continue; 540 541 strip_offset = (uint)mega_mod64 542 ((strip - span_set->data_strip_start), 543 span_set->span_row_data_width); 544 545 for (span = 0, span_offset = 0; span < raid->spanDepth; span++) 546 if (map->raidMap.ldSpanMap[ld].spanBlock[span]. 547 block_span_info.noElements >= info+1) { 548 if (strip_offset >= 549 span_set->strip_offset[span]) 550 span_offset = 551 span_set->strip_offset[span]; 552 else 553 break; 554 } 555 #if SPAN_DEBUG 556 dev_info(&instance->pdev->dev, "get_arm_from_strip:" 557 "for ld=0x%x strip=0x%lx arm is 0x%x\n", ld, 558 (long unsigned int)strip, (strip_offset - span_offset)); 559 #endif 560 retval = (strip_offset - span_offset); 561 return retval; 562 } 563 564 dev_err(&instance->pdev->dev, "get_arm_from_strip" 565 "returns invalid arm for ld=%x strip=%lx\n", 566 ld, (long unsigned int)strip); 567 568 return -1; 569 } 570 571 /* This Function will return Phys arm */ 572 u8 get_arm(struct megasas_instance *instance, u32 ld, u8 span, u64 stripe, 573 struct MR_FW_RAID_MAP_ALL *map) 574 { 575 struct MR_LD_RAID *raid = MR_LdRaidGet(ld, map); 576 /* Need to check correct default value */ 577 u32 arm = 0; 578 579 switch (raid->level) { 580 case 0: 581 case 5: 582 case 6: 583 arm = mega_mod64(stripe, SPAN_ROW_SIZE(map, ld, span)); 584 break; 585 case 1: 586 /* start with logical arm */ 587 arm = get_arm_from_strip(instance, ld, stripe, map); 588 if (arm != -1U) 589 arm *= 2; 590 break; 591 } 592 593 return arm; 594 } 595 596 597 /* 598 ****************************************************************************** 599 * 600 * This routine calculates the arm, span and block for the specified stripe and 601 * reference in stripe using spanset 602 * 603 * Inputs : 604 * 605 * ld - Logical drive number 606 * stripRow - Stripe number 607 * stripRef - Reference in stripe 608 * 609 * Outputs : 610 * 611 * span - Span number 612 * block - Absolute Block number in the physical disk 613 */ 614 static u8 mr_spanset_get_phy_params(struct megasas_instance *instance, u32 ld, 615 u64 stripRow, u16 stripRef, struct IO_REQUEST_INFO *io_info, 616 struct RAID_CONTEXT *pRAID_Context, 617 struct MR_FW_RAID_MAP_ALL *map) 618 { 619 struct MR_LD_RAID *raid = MR_LdRaidGet(ld, map); 620 u32 pd, arRef; 621 u8 physArm, span; 622 u64 row; 623 u8 retval = TRUE; 624 u8 do_invader = 0; 625 u64 *pdBlock = &io_info->pdBlock; 626 u16 *pDevHandle = &io_info->devHandle; 627 u32 logArm, rowMod, armQ, arm; 628 629 if ((instance->pdev->device == PCI_DEVICE_ID_LSI_INVADER || 630 instance->pdev->device == PCI_DEVICE_ID_LSI_FURY)) 631 do_invader = 1; 632 633 /*Get row and span from io_info for Uneven Span IO.*/ 634 row = io_info->start_row; 635 span = io_info->start_span; 636 637 638 if (raid->level == 6) { 639 logArm = get_arm_from_strip(instance, ld, stripRow, map); 640 if (logArm == -1U) 641 return FALSE; 642 rowMod = mega_mod64(row, SPAN_ROW_SIZE(map, ld, span)); 643 armQ = SPAN_ROW_SIZE(map, ld, span) - 1 - rowMod; 644 arm = armQ + 1 + logArm; 645 if (arm >= SPAN_ROW_SIZE(map, ld, span)) 646 arm -= SPAN_ROW_SIZE(map, ld, span); 647 physArm = (u8)arm; 648 } else 649 /* Calculate the arm */ 650 physArm = get_arm(instance, ld, span, stripRow, map); 651 if (physArm == 0xFF) 652 return FALSE; 653 654 arRef = MR_LdSpanArrayGet(ld, span, map); 655 pd = MR_ArPdGet(arRef, physArm, map); 656 657 if (pd != MR_PD_INVALID) 658 *pDevHandle = MR_PdDevHandleGet(pd, map); 659 else { 660 *pDevHandle = MR_PD_INVALID; 661 if ((raid->level >= 5) && 662 (!do_invader || (do_invader && 663 (raid->regTypeReqOnRead != REGION_TYPE_UNUSED)))) 664 pRAID_Context->regLockFlags = REGION_TYPE_EXCLUSIVE; 665 else if (raid->level == 1) { 666 pd = MR_ArPdGet(arRef, physArm + 1, map); 667 if (pd != MR_PD_INVALID) 668 *pDevHandle = MR_PdDevHandleGet(pd, map); 669 } 670 } 671 672 *pdBlock += stripRef + MR_LdSpanPtrGet(ld, span, map)->startBlk; 673 pRAID_Context->spanArm = (span << RAID_CTX_SPANARM_SPAN_SHIFT) | 674 physArm; 675 return retval; 676 } 677 678 /* 679 ****************************************************************************** 680 * 681 * This routine calculates the arm, span and block for the specified stripe and 682 * reference in stripe. 683 * 684 * Inputs : 685 * 686 * ld - Logical drive number 687 * stripRow - Stripe number 688 * stripRef - Reference in stripe 689 * 690 * Outputs : 691 * 692 * span - Span number 693 * block - Absolute Block number in the physical disk 694 */ 695 u8 MR_GetPhyParams(struct megasas_instance *instance, u32 ld, u64 stripRow, 696 u16 stripRef, struct IO_REQUEST_INFO *io_info, 697 struct RAID_CONTEXT *pRAID_Context, 698 struct MR_FW_RAID_MAP_ALL *map) 699 { 700 struct MR_LD_RAID *raid = MR_LdRaidGet(ld, map); 701 u32 pd, arRef; 702 u8 physArm, span; 703 u64 row; 704 u8 retval = TRUE; 705 u8 do_invader = 0; 706 u64 *pdBlock = &io_info->pdBlock; 707 u16 *pDevHandle = &io_info->devHandle; 708 709 if ((instance->pdev->device == PCI_DEVICE_ID_LSI_INVADER || 710 instance->pdev->device == PCI_DEVICE_ID_LSI_FURY)) 711 do_invader = 1; 712 713 row = mega_div64_32(stripRow, raid->rowDataSize); 714 715 if (raid->level == 6) { 716 /* logical arm within row */ 717 u32 logArm = mega_mod64(stripRow, raid->rowDataSize); 718 u32 rowMod, armQ, arm; 719 720 if (raid->rowSize == 0) 721 return FALSE; 722 /* get logical row mod */ 723 rowMod = mega_mod64(row, raid->rowSize); 724 armQ = raid->rowSize-1-rowMod; /* index of Q drive */ 725 arm = armQ+1+logArm; /* data always logically follows Q */ 726 if (arm >= raid->rowSize) /* handle wrap condition */ 727 arm -= raid->rowSize; 728 physArm = (u8)arm; 729 } else { 730 if (raid->modFactor == 0) 731 return FALSE; 732 physArm = MR_LdDataArmGet(ld, mega_mod64(stripRow, 733 raid->modFactor), 734 map); 735 } 736 737 if (raid->spanDepth == 1) { 738 span = 0; 739 *pdBlock = row << raid->stripeShift; 740 } else { 741 span = (u8)MR_GetSpanBlock(ld, row, pdBlock, map); 742 if (span == SPAN_INVALID) 743 return FALSE; 744 } 745 746 /* Get the array on which this span is present */ 747 arRef = MR_LdSpanArrayGet(ld, span, map); 748 pd = MR_ArPdGet(arRef, physArm, map); /* Get the pd */ 749 750 if (pd != MR_PD_INVALID) 751 /* Get dev handle from Pd. */ 752 *pDevHandle = MR_PdDevHandleGet(pd, map); 753 else { 754 *pDevHandle = MR_PD_INVALID; /* set dev handle as invalid. */ 755 if ((raid->level >= 5) && 756 (!do_invader || (do_invader && 757 (raid->regTypeReqOnRead != REGION_TYPE_UNUSED)))) 758 pRAID_Context->regLockFlags = REGION_TYPE_EXCLUSIVE; 759 else if (raid->level == 1) { 760 /* Get alternate Pd. */ 761 pd = MR_ArPdGet(arRef, physArm + 1, map); 762 if (pd != MR_PD_INVALID) 763 /* Get dev handle from Pd */ 764 *pDevHandle = MR_PdDevHandleGet(pd, map); 765 } 766 } 767 768 *pdBlock += stripRef + MR_LdSpanPtrGet(ld, span, map)->startBlk; 769 pRAID_Context->spanArm = (span << RAID_CTX_SPANARM_SPAN_SHIFT) | 770 physArm; 771 return retval; 772 } 773 774 /* 775 ****************************************************************************** 776 * 777 * MR_BuildRaidContext function 778 * 779 * This function will initiate command processing. The start/end row and strip 780 * information is calculated then the lock is acquired. 781 * This function will return 0 if region lock was acquired OR return num strips 782 */ 783 u8 784 MR_BuildRaidContext(struct megasas_instance *instance, 785 struct IO_REQUEST_INFO *io_info, 786 struct RAID_CONTEXT *pRAID_Context, 787 struct MR_FW_RAID_MAP_ALL *map) 788 { 789 struct MR_LD_RAID *raid; 790 u32 ld, stripSize, stripe_mask; 791 u64 endLba, endStrip, endRow, start_row, start_strip; 792 u64 regStart; 793 u32 regSize; 794 u8 num_strips, numRows; 795 u16 ref_in_start_stripe, ref_in_end_stripe; 796 u64 ldStartBlock; 797 u32 numBlocks, ldTgtId; 798 u8 isRead; 799 u8 retval = 0; 800 u8 startlba_span = SPAN_INVALID; 801 u64 *pdBlock = &io_info->pdBlock; 802 803 ldStartBlock = io_info->ldStartBlock; 804 numBlocks = io_info->numBlocks; 805 ldTgtId = io_info->ldTgtId; 806 isRead = io_info->isRead; 807 io_info->IoforUnevenSpan = 0; 808 io_info->start_span = SPAN_INVALID; 809 810 ld = MR_TargetIdToLdGet(ldTgtId, map); 811 raid = MR_LdRaidGet(ld, map); 812 813 /* 814 * if rowDataSize @RAID map and spanRowDataSize @SPAN INFO are zero 815 * return FALSE 816 */ 817 if (raid->rowDataSize == 0) { 818 if (MR_LdSpanPtrGet(ld, 0, map)->spanRowDataSize == 0) 819 return FALSE; 820 else if (instance->UnevenSpanSupport) { 821 io_info->IoforUnevenSpan = 1; 822 } else { 823 dev_info(&instance->pdev->dev, 824 "raid->rowDataSize is 0, but has SPAN[0]" 825 "rowDataSize = 0x%0x," 826 "but there is _NO_ UnevenSpanSupport\n", 827 MR_LdSpanPtrGet(ld, 0, map)->spanRowDataSize); 828 return FALSE; 829 } 830 } 831 832 stripSize = 1 << raid->stripeShift; 833 stripe_mask = stripSize-1; 834 835 836 /* 837 * calculate starting row and stripe, and number of strips and rows 838 */ 839 start_strip = ldStartBlock >> raid->stripeShift; 840 ref_in_start_stripe = (u16)(ldStartBlock & stripe_mask); 841 endLba = ldStartBlock + numBlocks - 1; 842 ref_in_end_stripe = (u16)(endLba & stripe_mask); 843 endStrip = endLba >> raid->stripeShift; 844 num_strips = (u8)(endStrip - start_strip + 1); /* End strip */ 845 846 if (io_info->IoforUnevenSpan) { 847 start_row = get_row_from_strip(instance, ld, start_strip, map); 848 endRow = get_row_from_strip(instance, ld, endStrip, map); 849 if (start_row == -1ULL || endRow == -1ULL) { 850 dev_info(&instance->pdev->dev, "return from %s %d." 851 "Send IO w/o region lock.\n", 852 __func__, __LINE__); 853 return FALSE; 854 } 855 856 if (raid->spanDepth == 1) { 857 startlba_span = 0; 858 *pdBlock = start_row << raid->stripeShift; 859 } else 860 startlba_span = (u8)mr_spanset_get_span_block(instance, 861 ld, start_row, pdBlock, map); 862 if (startlba_span == SPAN_INVALID) { 863 dev_info(&instance->pdev->dev, "return from %s %d" 864 "for row 0x%llx,start strip %llx" 865 "endSrip %llx\n", __func__, __LINE__, 866 (unsigned long long)start_row, 867 (unsigned long long)start_strip, 868 (unsigned long long)endStrip); 869 return FALSE; 870 } 871 io_info->start_span = startlba_span; 872 io_info->start_row = start_row; 873 #if SPAN_DEBUG 874 dev_dbg(&instance->pdev->dev, "Check Span number from %s %d" 875 "for row 0x%llx, start strip 0x%llx end strip 0x%llx" 876 " span 0x%x\n", __func__, __LINE__, 877 (unsigned long long)start_row, 878 (unsigned long long)start_strip, 879 (unsigned long long)endStrip, startlba_span); 880 dev_dbg(&instance->pdev->dev, "start_row 0x%llx endRow 0x%llx" 881 "Start span 0x%x\n", (unsigned long long)start_row, 882 (unsigned long long)endRow, startlba_span); 883 #endif 884 } else { 885 start_row = mega_div64_32(start_strip, raid->rowDataSize); 886 endRow = mega_div64_32(endStrip, raid->rowDataSize); 887 } 888 numRows = (u8)(endRow - start_row + 1); 889 890 /* 891 * calculate region info. 892 */ 893 894 /* assume region is at the start of the first row */ 895 regStart = start_row << raid->stripeShift; 896 /* assume this IO needs the full row - we'll adjust if not true */ 897 regSize = stripSize; 898 899 /* Check if we can send this I/O via FastPath */ 900 if (raid->capability.fpCapable) { 901 if (isRead) 902 io_info->fpOkForIo = (raid->capability.fpReadCapable && 903 ((num_strips == 1) || 904 raid->capability. 905 fpReadAcrossStripe)); 906 else 907 io_info->fpOkForIo = (raid->capability.fpWriteCapable && 908 ((num_strips == 1) || 909 raid->capability. 910 fpWriteAcrossStripe)); 911 } else 912 io_info->fpOkForIo = FALSE; 913 914 if (numRows == 1) { 915 /* single-strip IOs can always lock only the data needed */ 916 if (num_strips == 1) { 917 regStart += ref_in_start_stripe; 918 regSize = numBlocks; 919 } 920 /* multi-strip IOs always need to full stripe locked */ 921 } else if (io_info->IoforUnevenSpan == 0) { 922 /* 923 * For Even span region lock optimization. 924 * If the start strip is the last in the start row 925 */ 926 if (start_strip == (start_row + 1) * raid->rowDataSize - 1) { 927 regStart += ref_in_start_stripe; 928 /* initialize count to sectors from startref to end 929 of strip */ 930 regSize = stripSize - ref_in_start_stripe; 931 } 932 933 /* add complete rows in the middle of the transfer */ 934 if (numRows > 2) 935 regSize += (numRows-2) << raid->stripeShift; 936 937 /* if IO ends within first strip of last row*/ 938 if (endStrip == endRow*raid->rowDataSize) 939 regSize += ref_in_end_stripe+1; 940 else 941 regSize += stripSize; 942 } else { 943 /* 944 * For Uneven span region lock optimization. 945 * If the start strip is the last in the start row 946 */ 947 if (start_strip == (get_strip_from_row(instance, ld, start_row, map) + 948 SPAN_ROW_DATA_SIZE(map, ld, startlba_span) - 1)) { 949 regStart += ref_in_start_stripe; 950 /* initialize count to sectors from 951 * startRef to end of strip 952 */ 953 regSize = stripSize - ref_in_start_stripe; 954 } 955 /* Add complete rows in the middle of the transfer*/ 956 957 if (numRows > 2) 958 /* Add complete rows in the middle of the transfer*/ 959 regSize += (numRows-2) << raid->stripeShift; 960 961 /* if IO ends within first strip of last row */ 962 if (endStrip == get_strip_from_row(instance, ld, endRow, map)) 963 regSize += ref_in_end_stripe + 1; 964 else 965 regSize += stripSize; 966 } 967 968 pRAID_Context->timeoutValue = map->raidMap.fpPdIoTimeoutSec; 969 if ((instance->pdev->device == PCI_DEVICE_ID_LSI_INVADER) || 970 (instance->pdev->device == PCI_DEVICE_ID_LSI_FURY)) 971 pRAID_Context->regLockFlags = (isRead) ? 972 raid->regTypeReqOnRead : raid->regTypeReqOnWrite; 973 else 974 pRAID_Context->regLockFlags = (isRead) ? 975 REGION_TYPE_SHARED_READ : raid->regTypeReqOnWrite; 976 pRAID_Context->VirtualDiskTgtId = raid->targetId; 977 pRAID_Context->regLockRowLBA = regStart; 978 pRAID_Context->regLockLength = regSize; 979 pRAID_Context->configSeqNum = raid->seqNum; 980 981 /*Get Phy Params only if FP capable, or else leave it to MR firmware 982 to do the calculation.*/ 983 if (io_info->fpOkForIo) { 984 retval = io_info->IoforUnevenSpan ? 985 mr_spanset_get_phy_params(instance, ld, 986 start_strip, ref_in_start_stripe, 987 io_info, pRAID_Context, map) : 988 MR_GetPhyParams(instance, ld, start_strip, 989 ref_in_start_stripe, io_info, 990 pRAID_Context, map); 991 /* If IO on an invalid Pd, then FP is not possible.*/ 992 if (io_info->devHandle == MR_PD_INVALID) 993 io_info->fpOkForIo = FALSE; 994 return retval; 995 } else if (isRead) { 996 uint stripIdx; 997 for (stripIdx = 0; stripIdx < num_strips; stripIdx++) { 998 retval = io_info->IoforUnevenSpan ? 999 mr_spanset_get_phy_params(instance, ld, 1000 start_strip + stripIdx, 1001 ref_in_start_stripe, io_info, 1002 pRAID_Context, map) : 1003 MR_GetPhyParams(instance, ld, 1004 start_strip + stripIdx, ref_in_start_stripe, 1005 io_info, pRAID_Context, map); 1006 if (!retval) 1007 return TRUE; 1008 } 1009 } 1010 1011 #if SPAN_DEBUG 1012 /* Just for testing what arm we get for strip.*/ 1013 if (io_info->IoforUnevenSpan) 1014 get_arm_from_strip(instance, ld, start_strip, map); 1015 #endif 1016 return TRUE; 1017 } 1018 1019 /* 1020 ****************************************************************************** 1021 * 1022 * This routine pepare spanset info from Valid Raid map and store it into 1023 * local copy of ldSpanInfo per instance data structure. 1024 * 1025 * Inputs : 1026 * map - LD map 1027 * ldSpanInfo - ldSpanInfo per HBA instance 1028 * 1029 */ 1030 void mr_update_span_set(struct MR_FW_RAID_MAP_ALL *map, 1031 PLD_SPAN_INFO ldSpanInfo) 1032 { 1033 u8 span, count; 1034 u32 element, span_row_width; 1035 u64 span_row; 1036 struct MR_LD_RAID *raid; 1037 LD_SPAN_SET *span_set, *span_set_prev; 1038 struct MR_QUAD_ELEMENT *quad; 1039 int ldCount; 1040 u16 ld; 1041 1042 1043 for (ldCount = 0; ldCount < MAX_LOGICAL_DRIVES; ldCount++) { 1044 ld = MR_TargetIdToLdGet(ldCount, map); 1045 if (ld >= MAX_LOGICAL_DRIVES) 1046 continue; 1047 raid = MR_LdRaidGet(ld, map); 1048 for (element = 0; element < MAX_QUAD_DEPTH; element++) { 1049 for (span = 0; span < raid->spanDepth; span++) { 1050 if (map->raidMap.ldSpanMap[ld].spanBlock[span]. 1051 block_span_info.noElements < 1052 element + 1) 1053 continue; 1054 span_set = &(ldSpanInfo[ld].span_set[element]); 1055 quad = &map->raidMap.ldSpanMap[ld]. 1056 spanBlock[span].block_span_info. 1057 quad[element]; 1058 1059 span_set->diff = quad->diff; 1060 1061 for (count = 0, span_row_width = 0; 1062 count < raid->spanDepth; count++) { 1063 if (map->raidMap.ldSpanMap[ld]. 1064 spanBlock[count]. 1065 block_span_info. 1066 noElements >= element + 1) { 1067 span_set->strip_offset[count] = 1068 span_row_width; 1069 span_row_width += 1070 MR_LdSpanPtrGet 1071 (ld, count, map)->spanRowDataSize; 1072 printk(KERN_INFO "megasas:" 1073 "span %x rowDataSize %x\n", 1074 count, MR_LdSpanPtrGet 1075 (ld, count, map)->spanRowDataSize); 1076 } 1077 } 1078 1079 span_set->span_row_data_width = span_row_width; 1080 span_row = mega_div64_32(((quad->logEnd - 1081 quad->logStart) + quad->diff), 1082 quad->diff); 1083 1084 if (element == 0) { 1085 span_set->log_start_lba = 0; 1086 span_set->log_end_lba = 1087 ((span_row << raid->stripeShift) 1088 * span_row_width) - 1; 1089 1090 span_set->span_row_start = 0; 1091 span_set->span_row_end = span_row - 1; 1092 1093 span_set->data_strip_start = 0; 1094 span_set->data_strip_end = 1095 (span_row * span_row_width) - 1; 1096 1097 span_set->data_row_start = 0; 1098 span_set->data_row_end = 1099 (span_row * quad->diff) - 1; 1100 } else { 1101 span_set_prev = &(ldSpanInfo[ld]. 1102 span_set[element - 1]); 1103 span_set->log_start_lba = 1104 span_set_prev->log_end_lba + 1; 1105 span_set->log_end_lba = 1106 span_set->log_start_lba + 1107 ((span_row << raid->stripeShift) 1108 * span_row_width) - 1; 1109 1110 span_set->span_row_start = 1111 span_set_prev->span_row_end + 1; 1112 span_set->span_row_end = 1113 span_set->span_row_start + span_row - 1; 1114 1115 span_set->data_strip_start = 1116 span_set_prev->data_strip_end + 1; 1117 span_set->data_strip_end = 1118 span_set->data_strip_start + 1119 (span_row * span_row_width) - 1; 1120 1121 span_set->data_row_start = 1122 span_set_prev->data_row_end + 1; 1123 span_set->data_row_end = 1124 span_set->data_row_start + 1125 (span_row * quad->diff) - 1; 1126 } 1127 break; 1128 } 1129 if (span == raid->spanDepth) 1130 break; 1131 } 1132 } 1133 #if SPAN_DEBUG 1134 getSpanInfo(map, ldSpanInfo); 1135 #endif 1136 1137 } 1138 1139 void 1140 mr_update_load_balance_params(struct MR_FW_RAID_MAP_ALL *map, 1141 struct LD_LOAD_BALANCE_INFO *lbInfo) 1142 { 1143 int ldCount; 1144 u16 ld; 1145 struct MR_LD_RAID *raid; 1146 1147 for (ldCount = 0; ldCount < MAX_LOGICAL_DRIVES; ldCount++) { 1148 ld = MR_TargetIdToLdGet(ldCount, map); 1149 if (ld >= MAX_LOGICAL_DRIVES) { 1150 lbInfo[ldCount].loadBalanceFlag = 0; 1151 continue; 1152 } 1153 1154 raid = MR_LdRaidGet(ld, map); 1155 1156 /* Two drive Optimal RAID 1 */ 1157 if ((raid->level == 1) && (raid->rowSize == 2) && 1158 (raid->spanDepth == 1) && raid->ldState == 1159 MR_LD_STATE_OPTIMAL) { 1160 u32 pd, arRef; 1161 1162 lbInfo[ldCount].loadBalanceFlag = 1; 1163 1164 /* Get the array on which this span is present */ 1165 arRef = MR_LdSpanArrayGet(ld, 0, map); 1166 1167 /* Get the Pd */ 1168 pd = MR_ArPdGet(arRef, 0, map); 1169 /* Get dev handle from Pd */ 1170 lbInfo[ldCount].raid1DevHandle[0] = 1171 MR_PdDevHandleGet(pd, map); 1172 /* Get the Pd */ 1173 pd = MR_ArPdGet(arRef, 1, map); 1174 1175 /* Get the dev handle from Pd */ 1176 lbInfo[ldCount].raid1DevHandle[1] = 1177 MR_PdDevHandleGet(pd, map); 1178 } else 1179 lbInfo[ldCount].loadBalanceFlag = 0; 1180 } 1181 } 1182 1183 u8 megasas_get_best_arm(struct LD_LOAD_BALANCE_INFO *lbInfo, u8 arm, u64 block, 1184 u32 count) 1185 { 1186 u16 pend0, pend1; 1187 u64 diff0, diff1; 1188 u8 bestArm; 1189 1190 /* get the pending cmds for the data and mirror arms */ 1191 pend0 = atomic_read(&lbInfo->scsi_pending_cmds[0]); 1192 pend1 = atomic_read(&lbInfo->scsi_pending_cmds[1]); 1193 1194 /* Determine the disk whose head is nearer to the req. block */ 1195 diff0 = ABS_DIFF(block, lbInfo->last_accessed_block[0]); 1196 diff1 = ABS_DIFF(block, lbInfo->last_accessed_block[1]); 1197 bestArm = (diff0 <= diff1 ? 0 : 1); 1198 1199 /*Make balance count from 16 to 4 to keep driver in sync with Firmware*/ 1200 if ((bestArm == arm && pend0 > pend1 + 4) || 1201 (bestArm != arm && pend1 > pend0 + 4)) 1202 bestArm ^= 1; 1203 1204 /* Update the last accessed block on the correct pd */ 1205 lbInfo->last_accessed_block[bestArm] = block + count - 1; 1206 1207 return bestArm; 1208 } 1209 1210 u16 get_updated_dev_handle(struct LD_LOAD_BALANCE_INFO *lbInfo, 1211 struct IO_REQUEST_INFO *io_info) 1212 { 1213 u8 arm, old_arm; 1214 u16 devHandle; 1215 1216 old_arm = lbInfo->raid1DevHandle[0] == io_info->devHandle ? 0 : 1; 1217 1218 /* get best new arm */ 1219 arm = megasas_get_best_arm(lbInfo, old_arm, io_info->ldStartBlock, 1220 io_info->numBlocks); 1221 devHandle = lbInfo->raid1DevHandle[arm]; 1222 atomic_inc(&lbInfo->scsi_pending_cmds[arm]); 1223 1224 return devHandle; 1225 } 1226