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 70 #ifdef FALSE 71 #undef FALSE 72 #endif 73 #define FALSE 0 74 75 #ifdef TRUE 76 #undef TRUE 77 #endif 78 #define TRUE 1 79 80 #define SPAN_ROW_SIZE(map, ld, index_) (MR_LdSpanPtrGet(ld, index_, map)->spanRowSize) 81 #define SPAN_ROW_DATA_SIZE(map_, ld, index_) (MR_LdSpanPtrGet(ld, index_, map)->spanRowDataSize) 82 #define SPAN_INVALID 0xff 83 84 /* Prototypes */ 85 static void mr_update_span_set(struct MR_DRV_RAID_MAP_ALL *map, 86 PLD_SPAN_INFO ldSpanInfo); 87 static u8 mr_spanset_get_phy_params(struct megasas_instance *instance, u32 ld, 88 u64 stripRow, u16 stripRef, struct IO_REQUEST_INFO *io_info, 89 struct RAID_CONTEXT *pRAID_Context, struct MR_DRV_RAID_MAP_ALL *map); 90 static u64 get_row_from_strip(struct megasas_instance *instance, u32 ld, 91 u64 strip, struct MR_DRV_RAID_MAP_ALL *map); 92 93 u32 mega_mod64(u64 dividend, u32 divisor) 94 { 95 u64 d; 96 u32 remainder; 97 98 if (!divisor) 99 printk(KERN_ERR "megasas : DIVISOR is zero, in div fn\n"); 100 d = dividend; 101 remainder = do_div(d, divisor); 102 return remainder; 103 } 104 105 /** 106 * @param dividend : Dividend 107 * @param divisor : Divisor 108 * 109 * @return quotient 110 **/ 111 u64 mega_div64_32(uint64_t dividend, uint32_t divisor) 112 { 113 u32 remainder; 114 u64 d; 115 116 if (!divisor) 117 printk(KERN_ERR "megasas : DIVISOR is zero in mod fn\n"); 118 119 d = dividend; 120 remainder = do_div(d, divisor); 121 122 return d; 123 } 124 125 struct MR_LD_RAID *MR_LdRaidGet(u32 ld, struct MR_DRV_RAID_MAP_ALL *map) 126 { 127 return &map->raidMap.ldSpanMap[ld].ldRaid; 128 } 129 130 static struct MR_SPAN_BLOCK_INFO *MR_LdSpanInfoGet(u32 ld, 131 struct MR_DRV_RAID_MAP_ALL 132 *map) 133 { 134 return &map->raidMap.ldSpanMap[ld].spanBlock[0]; 135 } 136 137 static u8 MR_LdDataArmGet(u32 ld, u32 armIdx, struct MR_DRV_RAID_MAP_ALL *map) 138 { 139 return map->raidMap.ldSpanMap[ld].dataArmMap[armIdx]; 140 } 141 142 u16 MR_ArPdGet(u32 ar, u32 arm, struct MR_DRV_RAID_MAP_ALL *map) 143 { 144 return le16_to_cpu(map->raidMap.arMapInfo[ar].pd[arm]); 145 } 146 147 u16 MR_LdSpanArrayGet(u32 ld, u32 span, struct MR_DRV_RAID_MAP_ALL *map) 148 { 149 return le16_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].span.arrayRef); 150 } 151 152 __le16 MR_PdDevHandleGet(u32 pd, struct MR_DRV_RAID_MAP_ALL *map) 153 { 154 return map->raidMap.devHndlInfo[pd].curDevHdl; 155 } 156 157 static u8 MR_PdInterfaceTypeGet(u32 pd, struct MR_DRV_RAID_MAP_ALL *map) 158 { 159 return map->raidMap.devHndlInfo[pd].interfaceType; 160 } 161 162 u16 MR_GetLDTgtId(u32 ld, struct MR_DRV_RAID_MAP_ALL *map) 163 { 164 return le16_to_cpu(map->raidMap.ldSpanMap[ld].ldRaid.targetId); 165 } 166 167 u16 MR_TargetIdToLdGet(u32 ldTgtId, struct MR_DRV_RAID_MAP_ALL *map) 168 { 169 return map->raidMap.ldTgtIdToLd[ldTgtId]; 170 } 171 172 static struct MR_LD_SPAN *MR_LdSpanPtrGet(u32 ld, u32 span, 173 struct MR_DRV_RAID_MAP_ALL *map) 174 { 175 return &map->raidMap.ldSpanMap[ld].spanBlock[span].span; 176 } 177 178 /* 179 * This function will Populate Driver Map using firmware raid map 180 */ 181 void MR_PopulateDrvRaidMap(struct megasas_instance *instance) 182 { 183 struct fusion_context *fusion = instance->ctrl_context; 184 struct MR_FW_RAID_MAP_ALL *fw_map_old = NULL; 185 struct MR_FW_RAID_MAP *pFwRaidMap = NULL; 186 int i, j; 187 u16 ld_count; 188 struct MR_FW_RAID_MAP_DYNAMIC *fw_map_dyn; 189 struct MR_FW_RAID_MAP_EXT *fw_map_ext; 190 struct MR_RAID_MAP_DESC_TABLE *desc_table; 191 192 193 struct MR_DRV_RAID_MAP_ALL *drv_map = 194 fusion->ld_drv_map[(instance->map_id & 1)]; 195 struct MR_DRV_RAID_MAP *pDrvRaidMap = &drv_map->raidMap; 196 void *raid_map_data = NULL; 197 198 memset(drv_map, 0, fusion->drv_map_sz); 199 memset(pDrvRaidMap->ldTgtIdToLd, 200 0xff, (sizeof(u16) * MAX_LOGICAL_DRIVES_DYN)); 201 202 if (instance->max_raid_mapsize) { 203 fw_map_dyn = fusion->ld_map[(instance->map_id & 1)]; 204 desc_table = 205 (struct MR_RAID_MAP_DESC_TABLE *)((void *)fw_map_dyn + le32_to_cpu(fw_map_dyn->desc_table_offset)); 206 if (desc_table != fw_map_dyn->raid_map_desc_table) 207 dev_dbg(&instance->pdev->dev, "offsets of desc table are not matching desc %p original %p\n", 208 desc_table, fw_map_dyn->raid_map_desc_table); 209 210 ld_count = (u16)le16_to_cpu(fw_map_dyn->ld_count); 211 pDrvRaidMap->ldCount = (__le16)cpu_to_le16(ld_count); 212 pDrvRaidMap->fpPdIoTimeoutSec = 213 fw_map_dyn->fp_pd_io_timeout_sec; 214 pDrvRaidMap->totalSize = 215 cpu_to_le32(sizeof(struct MR_DRV_RAID_MAP_ALL)); 216 /* point to actual data starting point*/ 217 raid_map_data = (void *)fw_map_dyn + 218 le32_to_cpu(fw_map_dyn->desc_table_offset) + 219 le32_to_cpu(fw_map_dyn->desc_table_size); 220 221 for (i = 0; i < le32_to_cpu(fw_map_dyn->desc_table_num_elements); ++i) { 222 switch (le32_to_cpu(desc_table->raid_map_desc_type)) { 223 case RAID_MAP_DESC_TYPE_DEVHDL_INFO: 224 fw_map_dyn->dev_hndl_info = 225 (struct MR_DEV_HANDLE_INFO *)(raid_map_data + le32_to_cpu(desc_table->raid_map_desc_offset)); 226 memcpy(pDrvRaidMap->devHndlInfo, 227 fw_map_dyn->dev_hndl_info, 228 sizeof(struct MR_DEV_HANDLE_INFO) * 229 le32_to_cpu(desc_table->raid_map_desc_elements)); 230 break; 231 case RAID_MAP_DESC_TYPE_TGTID_INFO: 232 fw_map_dyn->ld_tgt_id_to_ld = 233 (u16 *)(raid_map_data + 234 le32_to_cpu(desc_table->raid_map_desc_offset)); 235 for (j = 0; j < le32_to_cpu(desc_table->raid_map_desc_elements); j++) { 236 pDrvRaidMap->ldTgtIdToLd[j] = 237 le16_to_cpu(fw_map_dyn->ld_tgt_id_to_ld[j]); 238 } 239 break; 240 case RAID_MAP_DESC_TYPE_ARRAY_INFO: 241 fw_map_dyn->ar_map_info = 242 (struct MR_ARRAY_INFO *) 243 (raid_map_data + le32_to_cpu(desc_table->raid_map_desc_offset)); 244 memcpy(pDrvRaidMap->arMapInfo, 245 fw_map_dyn->ar_map_info, 246 sizeof(struct MR_ARRAY_INFO) * 247 le32_to_cpu(desc_table->raid_map_desc_elements)); 248 break; 249 case RAID_MAP_DESC_TYPE_SPAN_INFO: 250 fw_map_dyn->ld_span_map = 251 (struct MR_LD_SPAN_MAP *) 252 (raid_map_data + 253 le32_to_cpu(desc_table->raid_map_desc_offset)); 254 memcpy(pDrvRaidMap->ldSpanMap, 255 fw_map_dyn->ld_span_map, 256 sizeof(struct MR_LD_SPAN_MAP) * 257 le32_to_cpu(desc_table->raid_map_desc_elements)); 258 break; 259 default: 260 dev_dbg(&instance->pdev->dev, "wrong number of desctableElements %d\n", 261 fw_map_dyn->desc_table_num_elements); 262 } 263 ++desc_table; 264 } 265 266 } else if (instance->supportmax256vd) { 267 fw_map_ext = 268 (struct MR_FW_RAID_MAP_EXT *)fusion->ld_map[(instance->map_id & 1)]; 269 ld_count = (u16)le16_to_cpu(fw_map_ext->ldCount); 270 if (ld_count > MAX_LOGICAL_DRIVES_EXT) { 271 dev_dbg(&instance->pdev->dev, "megaraid_sas: LD count exposed in RAID map in not valid\n"); 272 return; 273 } 274 275 pDrvRaidMap->ldCount = (__le16)cpu_to_le16(ld_count); 276 pDrvRaidMap->fpPdIoTimeoutSec = fw_map_ext->fpPdIoTimeoutSec; 277 for (i = 0; i < (MAX_LOGICAL_DRIVES_EXT); i++) 278 pDrvRaidMap->ldTgtIdToLd[i] = 279 (u16)fw_map_ext->ldTgtIdToLd[i]; 280 memcpy(pDrvRaidMap->ldSpanMap, fw_map_ext->ldSpanMap, 281 sizeof(struct MR_LD_SPAN_MAP) * ld_count); 282 memcpy(pDrvRaidMap->arMapInfo, fw_map_ext->arMapInfo, 283 sizeof(struct MR_ARRAY_INFO) * MAX_API_ARRAYS_EXT); 284 memcpy(pDrvRaidMap->devHndlInfo, fw_map_ext->devHndlInfo, 285 sizeof(struct MR_DEV_HANDLE_INFO) * 286 MAX_RAIDMAP_PHYSICAL_DEVICES); 287 288 /* New Raid map will not set totalSize, so keep expected value 289 * for legacy code in ValidateMapInfo 290 */ 291 pDrvRaidMap->totalSize = 292 cpu_to_le32(sizeof(struct MR_FW_RAID_MAP_EXT)); 293 } else { 294 fw_map_old = (struct MR_FW_RAID_MAP_ALL *) 295 fusion->ld_map[(instance->map_id & 1)]; 296 pFwRaidMap = &fw_map_old->raidMap; 297 ld_count = (u16)le32_to_cpu(pFwRaidMap->ldCount); 298 pDrvRaidMap->totalSize = pFwRaidMap->totalSize; 299 pDrvRaidMap->ldCount = (__le16)cpu_to_le16(ld_count); 300 pDrvRaidMap->fpPdIoTimeoutSec = pFwRaidMap->fpPdIoTimeoutSec; 301 for (i = 0; i < MAX_RAIDMAP_LOGICAL_DRIVES + MAX_RAIDMAP_VIEWS; i++) 302 pDrvRaidMap->ldTgtIdToLd[i] = 303 (u8)pFwRaidMap->ldTgtIdToLd[i]; 304 for (i = 0; i < ld_count; i++) { 305 pDrvRaidMap->ldSpanMap[i] = pFwRaidMap->ldSpanMap[i]; 306 } 307 memcpy(pDrvRaidMap->arMapInfo, pFwRaidMap->arMapInfo, 308 sizeof(struct MR_ARRAY_INFO) * MAX_RAIDMAP_ARRAYS); 309 memcpy(pDrvRaidMap->devHndlInfo, pFwRaidMap->devHndlInfo, 310 sizeof(struct MR_DEV_HANDLE_INFO) * 311 MAX_RAIDMAP_PHYSICAL_DEVICES); 312 } 313 } 314 315 /* 316 * This function will validate Map info data provided by FW 317 */ 318 u8 MR_ValidateMapInfo(struct megasas_instance *instance) 319 { 320 struct fusion_context *fusion; 321 struct MR_DRV_RAID_MAP_ALL *drv_map; 322 struct MR_DRV_RAID_MAP *pDrvRaidMap; 323 struct LD_LOAD_BALANCE_INFO *lbInfo; 324 PLD_SPAN_INFO ldSpanInfo; 325 struct MR_LD_RAID *raid; 326 u16 num_lds, i; 327 u16 ld; 328 u32 expected_size; 329 330 331 MR_PopulateDrvRaidMap(instance); 332 333 fusion = instance->ctrl_context; 334 drv_map = fusion->ld_drv_map[(instance->map_id & 1)]; 335 pDrvRaidMap = &drv_map->raidMap; 336 337 lbInfo = fusion->load_balance_info; 338 ldSpanInfo = fusion->log_to_span; 339 340 if (instance->max_raid_mapsize) 341 expected_size = sizeof(struct MR_DRV_RAID_MAP_ALL); 342 else if (instance->supportmax256vd) 343 expected_size = sizeof(struct MR_FW_RAID_MAP_EXT); 344 else 345 expected_size = 346 (sizeof(struct MR_FW_RAID_MAP) - sizeof(struct MR_LD_SPAN_MAP) + 347 (sizeof(struct MR_LD_SPAN_MAP) * le16_to_cpu(pDrvRaidMap->ldCount))); 348 349 if (le32_to_cpu(pDrvRaidMap->totalSize) != expected_size) { 350 dev_dbg(&instance->pdev->dev, "megasas: map info structure size 0x%x", 351 le32_to_cpu(pDrvRaidMap->totalSize)); 352 dev_dbg(&instance->pdev->dev, "is not matching expected size 0x%x\n", 353 (unsigned int)expected_size); 354 dev_err(&instance->pdev->dev, "megasas: span map %x, pDrvRaidMap->totalSize : %x\n", 355 (unsigned int)sizeof(struct MR_LD_SPAN_MAP), 356 le32_to_cpu(pDrvRaidMap->totalSize)); 357 return 0; 358 } 359 360 if (instance->UnevenSpanSupport) 361 mr_update_span_set(drv_map, ldSpanInfo); 362 363 if (lbInfo) 364 mr_update_load_balance_params(drv_map, lbInfo); 365 366 num_lds = le16_to_cpu(drv_map->raidMap.ldCount); 367 368 /*Convert Raid capability values to CPU arch */ 369 for (i = 0; (num_lds > 0) && (i < MAX_LOGICAL_DRIVES_EXT); i++) { 370 ld = MR_TargetIdToLdGet(i, drv_map); 371 372 /* For non existing VDs, iterate to next VD*/ 373 if (ld >= (MAX_LOGICAL_DRIVES_EXT - 1)) 374 continue; 375 376 raid = MR_LdRaidGet(ld, drv_map); 377 le32_to_cpus((u32 *)&raid->capability); 378 379 num_lds--; 380 } 381 382 return 1; 383 } 384 385 u32 MR_GetSpanBlock(u32 ld, u64 row, u64 *span_blk, 386 struct MR_DRV_RAID_MAP_ALL *map) 387 { 388 struct MR_SPAN_BLOCK_INFO *pSpanBlock = MR_LdSpanInfoGet(ld, map); 389 struct MR_QUAD_ELEMENT *quad; 390 struct MR_LD_RAID *raid = MR_LdRaidGet(ld, map); 391 u32 span, j; 392 393 for (span = 0; span < raid->spanDepth; span++, pSpanBlock++) { 394 395 for (j = 0; j < le32_to_cpu(pSpanBlock->block_span_info.noElements); j++) { 396 quad = &pSpanBlock->block_span_info.quad[j]; 397 398 if (le32_to_cpu(quad->diff) == 0) 399 return SPAN_INVALID; 400 if (le64_to_cpu(quad->logStart) <= row && row <= 401 le64_to_cpu(quad->logEnd) && (mega_mod64(row - le64_to_cpu(quad->logStart), 402 le32_to_cpu(quad->diff))) == 0) { 403 if (span_blk != NULL) { 404 u64 blk, debugBlk; 405 blk = mega_div64_32((row-le64_to_cpu(quad->logStart)), le32_to_cpu(quad->diff)); 406 debugBlk = blk; 407 408 blk = (blk + le64_to_cpu(quad->offsetInSpan)) << raid->stripeShift; 409 *span_blk = blk; 410 } 411 return span; 412 } 413 } 414 } 415 return SPAN_INVALID; 416 } 417 418 /* 419 ****************************************************************************** 420 * 421 * This routine calculates the Span block for given row using spanset. 422 * 423 * Inputs : 424 * instance - HBA instance 425 * ld - Logical drive number 426 * row - Row number 427 * map - LD map 428 * 429 * Outputs : 430 * 431 * span - Span number 432 * block - Absolute Block number in the physical disk 433 * div_error - Devide error code. 434 */ 435 436 u32 mr_spanset_get_span_block(struct megasas_instance *instance, 437 u32 ld, u64 row, u64 *span_blk, struct MR_DRV_RAID_MAP_ALL *map) 438 { 439 struct fusion_context *fusion = instance->ctrl_context; 440 struct MR_LD_RAID *raid = MR_LdRaidGet(ld, map); 441 LD_SPAN_SET *span_set; 442 struct MR_QUAD_ELEMENT *quad; 443 u32 span, info; 444 PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span; 445 446 for (info = 0; info < MAX_QUAD_DEPTH; info++) { 447 span_set = &(ldSpanInfo[ld].span_set[info]); 448 449 if (span_set->span_row_data_width == 0) 450 break; 451 452 if (row > span_set->data_row_end) 453 continue; 454 455 for (span = 0; span < raid->spanDepth; span++) 456 if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span]. 457 block_span_info.noElements) >= info+1) { 458 quad = &map->raidMap.ldSpanMap[ld]. 459 spanBlock[span]. 460 block_span_info.quad[info]; 461 if (le32_to_cpu(quad->diff) == 0) 462 return SPAN_INVALID; 463 if (le64_to_cpu(quad->logStart) <= row && 464 row <= le64_to_cpu(quad->logEnd) && 465 (mega_mod64(row - le64_to_cpu(quad->logStart), 466 le32_to_cpu(quad->diff))) == 0) { 467 if (span_blk != NULL) { 468 u64 blk; 469 blk = mega_div64_32 470 ((row - le64_to_cpu(quad->logStart)), 471 le32_to_cpu(quad->diff)); 472 blk = (blk + le64_to_cpu(quad->offsetInSpan)) 473 << raid->stripeShift; 474 *span_blk = blk; 475 } 476 return span; 477 } 478 } 479 } 480 return SPAN_INVALID; 481 } 482 483 /* 484 ****************************************************************************** 485 * 486 * This routine calculates the row for given strip using spanset. 487 * 488 * Inputs : 489 * instance - HBA instance 490 * ld - Logical drive number 491 * Strip - Strip 492 * map - LD map 493 * 494 * Outputs : 495 * 496 * row - row associated with strip 497 */ 498 499 static u64 get_row_from_strip(struct megasas_instance *instance, 500 u32 ld, u64 strip, struct MR_DRV_RAID_MAP_ALL *map) 501 { 502 struct fusion_context *fusion = instance->ctrl_context; 503 struct MR_LD_RAID *raid = MR_LdRaidGet(ld, map); 504 LD_SPAN_SET *span_set; 505 PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span; 506 u32 info, strip_offset, span, span_offset; 507 u64 span_set_Strip, span_set_Row, retval; 508 509 for (info = 0; info < MAX_QUAD_DEPTH; info++) { 510 span_set = &(ldSpanInfo[ld].span_set[info]); 511 512 if (span_set->span_row_data_width == 0) 513 break; 514 if (strip > span_set->data_strip_end) 515 continue; 516 517 span_set_Strip = strip - span_set->data_strip_start; 518 strip_offset = mega_mod64(span_set_Strip, 519 span_set->span_row_data_width); 520 span_set_Row = mega_div64_32(span_set_Strip, 521 span_set->span_row_data_width) * span_set->diff; 522 for (span = 0, span_offset = 0; span < raid->spanDepth; span++) 523 if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span]. 524 block_span_info.noElements) >= info+1) { 525 if (strip_offset >= 526 span_set->strip_offset[span]) 527 span_offset++; 528 else 529 break; 530 } 531 532 retval = (span_set->data_row_start + span_set_Row + 533 (span_offset - 1)); 534 return retval; 535 } 536 return -1LLU; 537 } 538 539 540 /* 541 ****************************************************************************** 542 * 543 * This routine calculates the Start Strip for given row using spanset. 544 * 545 * Inputs : 546 * instance - HBA instance 547 * ld - Logical drive number 548 * row - Row number 549 * map - LD map 550 * 551 * Outputs : 552 * 553 * Strip - Start strip associated with row 554 */ 555 556 static u64 get_strip_from_row(struct megasas_instance *instance, 557 u32 ld, u64 row, struct MR_DRV_RAID_MAP_ALL *map) 558 { 559 struct fusion_context *fusion = instance->ctrl_context; 560 struct MR_LD_RAID *raid = MR_LdRaidGet(ld, map); 561 LD_SPAN_SET *span_set; 562 struct MR_QUAD_ELEMENT *quad; 563 PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span; 564 u32 span, info; 565 u64 strip; 566 567 for (info = 0; info < MAX_QUAD_DEPTH; info++) { 568 span_set = &(ldSpanInfo[ld].span_set[info]); 569 570 if (span_set->span_row_data_width == 0) 571 break; 572 if (row > span_set->data_row_end) 573 continue; 574 575 for (span = 0; span < raid->spanDepth; span++) 576 if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span]. 577 block_span_info.noElements) >= info+1) { 578 quad = &map->raidMap.ldSpanMap[ld]. 579 spanBlock[span].block_span_info.quad[info]; 580 if (le64_to_cpu(quad->logStart) <= row && 581 row <= le64_to_cpu(quad->logEnd) && 582 mega_mod64((row - le64_to_cpu(quad->logStart)), 583 le32_to_cpu(quad->diff)) == 0) { 584 strip = mega_div64_32 585 (((row - span_set->data_row_start) 586 - le64_to_cpu(quad->logStart)), 587 le32_to_cpu(quad->diff)); 588 strip *= span_set->span_row_data_width; 589 strip += span_set->data_strip_start; 590 strip += span_set->strip_offset[span]; 591 return strip; 592 } 593 } 594 } 595 dev_err(&instance->pdev->dev, "get_strip_from_row" 596 "returns invalid strip for ld=%x, row=%lx\n", 597 ld, (long unsigned int)row); 598 return -1; 599 } 600 601 /* 602 ****************************************************************************** 603 * 604 * This routine calculates the Physical Arm for given strip using spanset. 605 * 606 * Inputs : 607 * instance - HBA instance 608 * ld - Logical drive number 609 * strip - Strip 610 * map - LD map 611 * 612 * Outputs : 613 * 614 * Phys Arm - Phys Arm associated with strip 615 */ 616 617 static u32 get_arm_from_strip(struct megasas_instance *instance, 618 u32 ld, u64 strip, struct MR_DRV_RAID_MAP_ALL *map) 619 { 620 struct fusion_context *fusion = instance->ctrl_context; 621 struct MR_LD_RAID *raid = MR_LdRaidGet(ld, map); 622 LD_SPAN_SET *span_set; 623 PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span; 624 u32 info, strip_offset, span, span_offset, retval; 625 626 for (info = 0 ; info < MAX_QUAD_DEPTH; info++) { 627 span_set = &(ldSpanInfo[ld].span_set[info]); 628 629 if (span_set->span_row_data_width == 0) 630 break; 631 if (strip > span_set->data_strip_end) 632 continue; 633 634 strip_offset = (uint)mega_mod64 635 ((strip - span_set->data_strip_start), 636 span_set->span_row_data_width); 637 638 for (span = 0, span_offset = 0; span < raid->spanDepth; span++) 639 if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span]. 640 block_span_info.noElements) >= info+1) { 641 if (strip_offset >= 642 span_set->strip_offset[span]) 643 span_offset = 644 span_set->strip_offset[span]; 645 else 646 break; 647 } 648 649 retval = (strip_offset - span_offset); 650 return retval; 651 } 652 653 dev_err(&instance->pdev->dev, "get_arm_from_strip" 654 "returns invalid arm for ld=%x strip=%lx\n", 655 ld, (long unsigned int)strip); 656 657 return -1; 658 } 659 660 /* This Function will return Phys arm */ 661 u8 get_arm(struct megasas_instance *instance, u32 ld, u8 span, u64 stripe, 662 struct MR_DRV_RAID_MAP_ALL *map) 663 { 664 struct MR_LD_RAID *raid = MR_LdRaidGet(ld, map); 665 /* Need to check correct default value */ 666 u32 arm = 0; 667 668 switch (raid->level) { 669 case 0: 670 case 5: 671 case 6: 672 arm = mega_mod64(stripe, SPAN_ROW_SIZE(map, ld, span)); 673 break; 674 case 1: 675 /* start with logical arm */ 676 arm = get_arm_from_strip(instance, ld, stripe, map); 677 if (arm != -1U) 678 arm *= 2; 679 break; 680 } 681 682 return arm; 683 } 684 685 686 /* 687 ****************************************************************************** 688 * 689 * This routine calculates the arm, span and block for the specified stripe and 690 * reference in stripe using spanset 691 * 692 * Inputs : 693 * 694 * ld - Logical drive number 695 * stripRow - Stripe number 696 * stripRef - Reference in stripe 697 * 698 * Outputs : 699 * 700 * span - Span number 701 * block - Absolute Block number in the physical disk 702 */ 703 static u8 mr_spanset_get_phy_params(struct megasas_instance *instance, u32 ld, 704 u64 stripRow, u16 stripRef, struct IO_REQUEST_INFO *io_info, 705 struct RAID_CONTEXT *pRAID_Context, 706 struct MR_DRV_RAID_MAP_ALL *map) 707 { 708 struct MR_LD_RAID *raid = MR_LdRaidGet(ld, map); 709 u32 pd, arRef, r1_alt_pd; 710 u8 physArm, span; 711 u64 row; 712 u8 retval = TRUE; 713 u64 *pdBlock = &io_info->pdBlock; 714 __le16 *pDevHandle = &io_info->devHandle; 715 u8 *pPdInterface = &io_info->pd_interface; 716 u32 logArm, rowMod, armQ, arm; 717 struct fusion_context *fusion; 718 719 fusion = instance->ctrl_context; 720 *pDevHandle = cpu_to_le16(MR_DEVHANDLE_INVALID); 721 722 /*Get row and span from io_info for Uneven Span IO.*/ 723 row = io_info->start_row; 724 span = io_info->start_span; 725 726 727 if (raid->level == 6) { 728 logArm = get_arm_from_strip(instance, ld, stripRow, map); 729 if (logArm == -1U) 730 return FALSE; 731 rowMod = mega_mod64(row, SPAN_ROW_SIZE(map, ld, span)); 732 armQ = SPAN_ROW_SIZE(map, ld, span) - 1 - rowMod; 733 arm = armQ + 1 + logArm; 734 if (arm >= SPAN_ROW_SIZE(map, ld, span)) 735 arm -= SPAN_ROW_SIZE(map, ld, span); 736 physArm = (u8)arm; 737 } else 738 /* Calculate the arm */ 739 physArm = get_arm(instance, ld, span, stripRow, map); 740 if (physArm == 0xFF) 741 return FALSE; 742 743 arRef = MR_LdSpanArrayGet(ld, span, map); 744 pd = MR_ArPdGet(arRef, physArm, map); 745 746 if (pd != MR_PD_INVALID) { 747 *pDevHandle = MR_PdDevHandleGet(pd, map); 748 *pPdInterface = MR_PdInterfaceTypeGet(pd, map); 749 /* get second pd also for raid 1/10 fast path writes*/ 750 if (instance->is_ventura && 751 (raid->level == 1) && 752 !io_info->isRead) { 753 r1_alt_pd = MR_ArPdGet(arRef, physArm + 1, map); 754 if (r1_alt_pd != MR_PD_INVALID) 755 io_info->r1_alt_dev_handle = 756 MR_PdDevHandleGet(r1_alt_pd, map); 757 } 758 } else { 759 if ((raid->level >= 5) && 760 ((fusion->adapter_type == THUNDERBOLT_SERIES) || 761 ((fusion->adapter_type == INVADER_SERIES) && 762 (raid->regTypeReqOnRead != REGION_TYPE_UNUSED)))) 763 pRAID_Context->reg_lock_flags = REGION_TYPE_EXCLUSIVE; 764 else if (raid->level == 1) { 765 physArm = physArm + 1; 766 pd = MR_ArPdGet(arRef, physArm, map); 767 if (pd != MR_PD_INVALID) { 768 *pDevHandle = MR_PdDevHandleGet(pd, map); 769 *pPdInterface = MR_PdInterfaceTypeGet(pd, map); 770 } 771 } 772 } 773 774 *pdBlock += stripRef + le64_to_cpu(MR_LdSpanPtrGet(ld, span, map)->startBlk); 775 if (instance->is_ventura) { 776 ((struct RAID_CONTEXT_G35 *)pRAID_Context)->span_arm = 777 (span << RAID_CTX_SPANARM_SPAN_SHIFT) | physArm; 778 io_info->span_arm = 779 (span << RAID_CTX_SPANARM_SPAN_SHIFT) | physArm; 780 } else { 781 pRAID_Context->span_arm = 782 (span << RAID_CTX_SPANARM_SPAN_SHIFT) | physArm; 783 io_info->span_arm = pRAID_Context->span_arm; 784 } 785 io_info->pd_after_lb = pd; 786 return retval; 787 } 788 789 /* 790 ****************************************************************************** 791 * 792 * This routine calculates the arm, span and block for the specified stripe and 793 * reference in stripe. 794 * 795 * Inputs : 796 * 797 * ld - Logical drive number 798 * stripRow - Stripe number 799 * stripRef - Reference in stripe 800 * 801 * Outputs : 802 * 803 * span - Span number 804 * block - Absolute Block number in the physical disk 805 */ 806 u8 MR_GetPhyParams(struct megasas_instance *instance, u32 ld, u64 stripRow, 807 u16 stripRef, struct IO_REQUEST_INFO *io_info, 808 struct RAID_CONTEXT *pRAID_Context, 809 struct MR_DRV_RAID_MAP_ALL *map) 810 { 811 struct MR_LD_RAID *raid = MR_LdRaidGet(ld, map); 812 u32 pd, arRef, r1_alt_pd; 813 u8 physArm, span; 814 u64 row; 815 u8 retval = TRUE; 816 u64 *pdBlock = &io_info->pdBlock; 817 __le16 *pDevHandle = &io_info->devHandle; 818 u8 *pPdInterface = &io_info->pd_interface; 819 struct fusion_context *fusion; 820 821 fusion = instance->ctrl_context; 822 *pDevHandle = cpu_to_le16(MR_DEVHANDLE_INVALID); 823 824 row = mega_div64_32(stripRow, raid->rowDataSize); 825 826 if (raid->level == 6) { 827 /* logical arm within row */ 828 u32 logArm = mega_mod64(stripRow, raid->rowDataSize); 829 u32 rowMod, armQ, arm; 830 831 if (raid->rowSize == 0) 832 return FALSE; 833 /* get logical row mod */ 834 rowMod = mega_mod64(row, raid->rowSize); 835 armQ = raid->rowSize-1-rowMod; /* index of Q drive */ 836 arm = armQ+1+logArm; /* data always logically follows Q */ 837 if (arm >= raid->rowSize) /* handle wrap condition */ 838 arm -= raid->rowSize; 839 physArm = (u8)arm; 840 } else { 841 if (raid->modFactor == 0) 842 return FALSE; 843 physArm = MR_LdDataArmGet(ld, mega_mod64(stripRow, 844 raid->modFactor), 845 map); 846 } 847 848 if (raid->spanDepth == 1) { 849 span = 0; 850 *pdBlock = row << raid->stripeShift; 851 } else { 852 span = (u8)MR_GetSpanBlock(ld, row, pdBlock, map); 853 if (span == SPAN_INVALID) 854 return FALSE; 855 } 856 857 /* Get the array on which this span is present */ 858 arRef = MR_LdSpanArrayGet(ld, span, map); 859 pd = MR_ArPdGet(arRef, physArm, map); /* Get the pd */ 860 861 if (pd != MR_PD_INVALID) { 862 /* Get dev handle from Pd. */ 863 *pDevHandle = MR_PdDevHandleGet(pd, map); 864 *pPdInterface = MR_PdInterfaceTypeGet(pd, map); 865 /* get second pd also for raid 1/10 fast path writes*/ 866 if (instance->is_ventura && 867 (raid->level == 1) && 868 !io_info->isRead) { 869 r1_alt_pd = MR_ArPdGet(arRef, physArm + 1, map); 870 if (r1_alt_pd != MR_PD_INVALID) 871 io_info->r1_alt_dev_handle = 872 MR_PdDevHandleGet(r1_alt_pd, map); 873 } 874 } else { 875 if ((raid->level >= 5) && 876 ((fusion->adapter_type == THUNDERBOLT_SERIES) || 877 ((fusion->adapter_type == INVADER_SERIES) && 878 (raid->regTypeReqOnRead != REGION_TYPE_UNUSED)))) 879 pRAID_Context->reg_lock_flags = REGION_TYPE_EXCLUSIVE; 880 else if (raid->level == 1) { 881 /* Get alternate Pd. */ 882 physArm = physArm + 1; 883 pd = MR_ArPdGet(arRef, physArm, map); 884 if (pd != MR_PD_INVALID) { 885 /* Get dev handle from Pd */ 886 *pDevHandle = MR_PdDevHandleGet(pd, map); 887 *pPdInterface = MR_PdInterfaceTypeGet(pd, map); 888 } 889 } 890 } 891 892 *pdBlock += stripRef + le64_to_cpu(MR_LdSpanPtrGet(ld, span, map)->startBlk); 893 if (instance->is_ventura) { 894 ((struct RAID_CONTEXT_G35 *)pRAID_Context)->span_arm = 895 (span << RAID_CTX_SPANARM_SPAN_SHIFT) | physArm; 896 io_info->span_arm = 897 (span << RAID_CTX_SPANARM_SPAN_SHIFT) | physArm; 898 } else { 899 pRAID_Context->span_arm = 900 (span << RAID_CTX_SPANARM_SPAN_SHIFT) | physArm; 901 io_info->span_arm = pRAID_Context->span_arm; 902 } 903 io_info->pd_after_lb = pd; 904 return retval; 905 } 906 907 /* 908 ****************************************************************************** 909 * 910 * MR_BuildRaidContext function 911 * 912 * This function will initiate command processing. The start/end row and strip 913 * information is calculated then the lock is acquired. 914 * This function will return 0 if region lock was acquired OR return num strips 915 */ 916 u8 917 MR_BuildRaidContext(struct megasas_instance *instance, 918 struct IO_REQUEST_INFO *io_info, 919 struct RAID_CONTEXT *pRAID_Context, 920 struct MR_DRV_RAID_MAP_ALL *map, u8 **raidLUN) 921 { 922 struct fusion_context *fusion; 923 struct MR_LD_RAID *raid; 924 u32 stripSize, stripe_mask; 925 u64 endLba, endStrip, endRow, start_row, start_strip; 926 u64 regStart; 927 u32 regSize; 928 u8 num_strips, numRows; 929 u16 ref_in_start_stripe, ref_in_end_stripe; 930 u64 ldStartBlock; 931 u32 numBlocks, ldTgtId; 932 u8 isRead; 933 u8 retval = 0; 934 u8 startlba_span = SPAN_INVALID; 935 u64 *pdBlock = &io_info->pdBlock; 936 u16 ld; 937 938 ldStartBlock = io_info->ldStartBlock; 939 numBlocks = io_info->numBlocks; 940 ldTgtId = io_info->ldTgtId; 941 isRead = io_info->isRead; 942 io_info->IoforUnevenSpan = 0; 943 io_info->start_span = SPAN_INVALID; 944 fusion = instance->ctrl_context; 945 946 ld = MR_TargetIdToLdGet(ldTgtId, map); 947 raid = MR_LdRaidGet(ld, map); 948 /*check read ahead bit*/ 949 io_info->ra_capable = raid->capability.ra_capable; 950 951 /* 952 * if rowDataSize @RAID map and spanRowDataSize @SPAN INFO are zero 953 * return FALSE 954 */ 955 if (raid->rowDataSize == 0) { 956 if (MR_LdSpanPtrGet(ld, 0, map)->spanRowDataSize == 0) 957 return FALSE; 958 else if (instance->UnevenSpanSupport) { 959 io_info->IoforUnevenSpan = 1; 960 } else { 961 dev_info(&instance->pdev->dev, 962 "raid->rowDataSize is 0, but has SPAN[0]" 963 "rowDataSize = 0x%0x," 964 "but there is _NO_ UnevenSpanSupport\n", 965 MR_LdSpanPtrGet(ld, 0, map)->spanRowDataSize); 966 return FALSE; 967 } 968 } 969 970 stripSize = 1 << raid->stripeShift; 971 stripe_mask = stripSize-1; 972 973 974 /* 975 * calculate starting row and stripe, and number of strips and rows 976 */ 977 start_strip = ldStartBlock >> raid->stripeShift; 978 ref_in_start_stripe = (u16)(ldStartBlock & stripe_mask); 979 endLba = ldStartBlock + numBlocks - 1; 980 ref_in_end_stripe = (u16)(endLba & stripe_mask); 981 endStrip = endLba >> raid->stripeShift; 982 num_strips = (u8)(endStrip - start_strip + 1); /* End strip */ 983 984 if (io_info->IoforUnevenSpan) { 985 start_row = get_row_from_strip(instance, ld, start_strip, map); 986 endRow = get_row_from_strip(instance, ld, endStrip, map); 987 if (start_row == -1ULL || endRow == -1ULL) { 988 dev_info(&instance->pdev->dev, "return from %s %d." 989 "Send IO w/o region lock.\n", 990 __func__, __LINE__); 991 return FALSE; 992 } 993 994 if (raid->spanDepth == 1) { 995 startlba_span = 0; 996 *pdBlock = start_row << raid->stripeShift; 997 } else 998 startlba_span = (u8)mr_spanset_get_span_block(instance, 999 ld, start_row, pdBlock, map); 1000 if (startlba_span == SPAN_INVALID) { 1001 dev_info(&instance->pdev->dev, "return from %s %d" 1002 "for row 0x%llx,start strip %llx" 1003 "endSrip %llx\n", __func__, __LINE__, 1004 (unsigned long long)start_row, 1005 (unsigned long long)start_strip, 1006 (unsigned long long)endStrip); 1007 return FALSE; 1008 } 1009 io_info->start_span = startlba_span; 1010 io_info->start_row = start_row; 1011 } else { 1012 start_row = mega_div64_32(start_strip, raid->rowDataSize); 1013 endRow = mega_div64_32(endStrip, raid->rowDataSize); 1014 } 1015 numRows = (u8)(endRow - start_row + 1); 1016 1017 /* 1018 * calculate region info. 1019 */ 1020 1021 /* assume region is at the start of the first row */ 1022 regStart = start_row << raid->stripeShift; 1023 /* assume this IO needs the full row - we'll adjust if not true */ 1024 regSize = stripSize; 1025 1026 io_info->do_fp_rlbypass = raid->capability.fpBypassRegionLock; 1027 1028 /* Check if we can send this I/O via FastPath */ 1029 if (raid->capability.fpCapable) { 1030 if (isRead) 1031 io_info->fpOkForIo = (raid->capability.fpReadCapable && 1032 ((num_strips == 1) || 1033 raid->capability. 1034 fpReadAcrossStripe)); 1035 else 1036 io_info->fpOkForIo = (raid->capability.fpWriteCapable && 1037 ((num_strips == 1) || 1038 raid->capability. 1039 fpWriteAcrossStripe)); 1040 } else 1041 io_info->fpOkForIo = FALSE; 1042 1043 if (numRows == 1) { 1044 /* single-strip IOs can always lock only the data needed */ 1045 if (num_strips == 1) { 1046 regStart += ref_in_start_stripe; 1047 regSize = numBlocks; 1048 } 1049 /* multi-strip IOs always need to full stripe locked */ 1050 } else if (io_info->IoforUnevenSpan == 0) { 1051 /* 1052 * For Even span region lock optimization. 1053 * If the start strip is the last in the start row 1054 */ 1055 if (start_strip == (start_row + 1) * raid->rowDataSize - 1) { 1056 regStart += ref_in_start_stripe; 1057 /* initialize count to sectors from startref to end 1058 of strip */ 1059 regSize = stripSize - ref_in_start_stripe; 1060 } 1061 1062 /* add complete rows in the middle of the transfer */ 1063 if (numRows > 2) 1064 regSize += (numRows-2) << raid->stripeShift; 1065 1066 /* if IO ends within first strip of last row*/ 1067 if (endStrip == endRow*raid->rowDataSize) 1068 regSize += ref_in_end_stripe+1; 1069 else 1070 regSize += stripSize; 1071 } else { 1072 /* 1073 * For Uneven span region lock optimization. 1074 * If the start strip is the last in the start row 1075 */ 1076 if (start_strip == (get_strip_from_row(instance, ld, start_row, map) + 1077 SPAN_ROW_DATA_SIZE(map, ld, startlba_span) - 1)) { 1078 regStart += ref_in_start_stripe; 1079 /* initialize count to sectors from 1080 * startRef to end of strip 1081 */ 1082 regSize = stripSize - ref_in_start_stripe; 1083 } 1084 /* Add complete rows in the middle of the transfer*/ 1085 1086 if (numRows > 2) 1087 /* Add complete rows in the middle of the transfer*/ 1088 regSize += (numRows-2) << raid->stripeShift; 1089 1090 /* if IO ends within first strip of last row */ 1091 if (endStrip == get_strip_from_row(instance, ld, endRow, map)) 1092 regSize += ref_in_end_stripe + 1; 1093 else 1094 regSize += stripSize; 1095 } 1096 1097 pRAID_Context->timeout_value = 1098 cpu_to_le16(raid->fpIoTimeoutForLd ? 1099 raid->fpIoTimeoutForLd : 1100 map->raidMap.fpPdIoTimeoutSec); 1101 if (fusion->adapter_type == INVADER_SERIES) 1102 pRAID_Context->reg_lock_flags = (isRead) ? 1103 raid->regTypeReqOnRead : raid->regTypeReqOnWrite; 1104 else if (!instance->is_ventura) 1105 pRAID_Context->reg_lock_flags = (isRead) ? 1106 REGION_TYPE_SHARED_READ : raid->regTypeReqOnWrite; 1107 pRAID_Context->virtual_disk_tgt_id = raid->targetId; 1108 pRAID_Context->reg_lock_row_lba = cpu_to_le64(regStart); 1109 pRAID_Context->reg_lock_length = cpu_to_le32(regSize); 1110 pRAID_Context->config_seq_num = raid->seqNum; 1111 /* save pointer to raid->LUN array */ 1112 *raidLUN = raid->LUN; 1113 1114 1115 /*Get Phy Params only if FP capable, or else leave it to MR firmware 1116 to do the calculation.*/ 1117 if (io_info->fpOkForIo) { 1118 retval = io_info->IoforUnevenSpan ? 1119 mr_spanset_get_phy_params(instance, ld, 1120 start_strip, ref_in_start_stripe, 1121 io_info, pRAID_Context, map) : 1122 MR_GetPhyParams(instance, ld, start_strip, 1123 ref_in_start_stripe, io_info, 1124 pRAID_Context, map); 1125 /* If IO on an invalid Pd, then FP is not possible.*/ 1126 if (io_info->devHandle == MR_DEVHANDLE_INVALID) 1127 io_info->fpOkForIo = FALSE; 1128 return retval; 1129 } else if (isRead) { 1130 uint stripIdx; 1131 for (stripIdx = 0; stripIdx < num_strips; stripIdx++) { 1132 retval = io_info->IoforUnevenSpan ? 1133 mr_spanset_get_phy_params(instance, ld, 1134 start_strip + stripIdx, 1135 ref_in_start_stripe, io_info, 1136 pRAID_Context, map) : 1137 MR_GetPhyParams(instance, ld, 1138 start_strip + stripIdx, ref_in_start_stripe, 1139 io_info, pRAID_Context, map); 1140 if (!retval) 1141 return TRUE; 1142 } 1143 } 1144 return TRUE; 1145 } 1146 1147 /* 1148 ****************************************************************************** 1149 * 1150 * This routine pepare spanset info from Valid Raid map and store it into 1151 * local copy of ldSpanInfo per instance data structure. 1152 * 1153 * Inputs : 1154 * map - LD map 1155 * ldSpanInfo - ldSpanInfo per HBA instance 1156 * 1157 */ 1158 void mr_update_span_set(struct MR_DRV_RAID_MAP_ALL *map, 1159 PLD_SPAN_INFO ldSpanInfo) 1160 { 1161 u8 span, count; 1162 u32 element, span_row_width; 1163 u64 span_row; 1164 struct MR_LD_RAID *raid; 1165 LD_SPAN_SET *span_set, *span_set_prev; 1166 struct MR_QUAD_ELEMENT *quad; 1167 int ldCount; 1168 u16 ld; 1169 1170 1171 for (ldCount = 0; ldCount < MAX_LOGICAL_DRIVES_EXT; ldCount++) { 1172 ld = MR_TargetIdToLdGet(ldCount, map); 1173 if (ld >= (MAX_LOGICAL_DRIVES_EXT - 1)) 1174 continue; 1175 raid = MR_LdRaidGet(ld, map); 1176 for (element = 0; element < MAX_QUAD_DEPTH; element++) { 1177 for (span = 0; span < raid->spanDepth; span++) { 1178 if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span]. 1179 block_span_info.noElements) < 1180 element + 1) 1181 continue; 1182 span_set = &(ldSpanInfo[ld].span_set[element]); 1183 quad = &map->raidMap.ldSpanMap[ld]. 1184 spanBlock[span].block_span_info. 1185 quad[element]; 1186 1187 span_set->diff = le32_to_cpu(quad->diff); 1188 1189 for (count = 0, span_row_width = 0; 1190 count < raid->spanDepth; count++) { 1191 if (le32_to_cpu(map->raidMap.ldSpanMap[ld]. 1192 spanBlock[count]. 1193 block_span_info. 1194 noElements) >= element + 1) { 1195 span_set->strip_offset[count] = 1196 span_row_width; 1197 span_row_width += 1198 MR_LdSpanPtrGet 1199 (ld, count, map)->spanRowDataSize; 1200 } 1201 } 1202 1203 span_set->span_row_data_width = span_row_width; 1204 span_row = mega_div64_32(((le64_to_cpu(quad->logEnd) - 1205 le64_to_cpu(quad->logStart)) + le32_to_cpu(quad->diff)), 1206 le32_to_cpu(quad->diff)); 1207 1208 if (element == 0) { 1209 span_set->log_start_lba = 0; 1210 span_set->log_end_lba = 1211 ((span_row << raid->stripeShift) 1212 * span_row_width) - 1; 1213 1214 span_set->span_row_start = 0; 1215 span_set->span_row_end = span_row - 1; 1216 1217 span_set->data_strip_start = 0; 1218 span_set->data_strip_end = 1219 (span_row * span_row_width) - 1; 1220 1221 span_set->data_row_start = 0; 1222 span_set->data_row_end = 1223 (span_row * le32_to_cpu(quad->diff)) - 1; 1224 } else { 1225 span_set_prev = &(ldSpanInfo[ld]. 1226 span_set[element - 1]); 1227 span_set->log_start_lba = 1228 span_set_prev->log_end_lba + 1; 1229 span_set->log_end_lba = 1230 span_set->log_start_lba + 1231 ((span_row << raid->stripeShift) 1232 * span_row_width) - 1; 1233 1234 span_set->span_row_start = 1235 span_set_prev->span_row_end + 1; 1236 span_set->span_row_end = 1237 span_set->span_row_start + span_row - 1; 1238 1239 span_set->data_strip_start = 1240 span_set_prev->data_strip_end + 1; 1241 span_set->data_strip_end = 1242 span_set->data_strip_start + 1243 (span_row * span_row_width) - 1; 1244 1245 span_set->data_row_start = 1246 span_set_prev->data_row_end + 1; 1247 span_set->data_row_end = 1248 span_set->data_row_start + 1249 (span_row * le32_to_cpu(quad->diff)) - 1; 1250 } 1251 break; 1252 } 1253 if (span == raid->spanDepth) 1254 break; 1255 } 1256 } 1257 } 1258 1259 void mr_update_load_balance_params(struct MR_DRV_RAID_MAP_ALL *drv_map, 1260 struct LD_LOAD_BALANCE_INFO *lbInfo) 1261 { 1262 int ldCount; 1263 u16 ld; 1264 struct MR_LD_RAID *raid; 1265 1266 if (lb_pending_cmds > 128 || lb_pending_cmds < 1) 1267 lb_pending_cmds = LB_PENDING_CMDS_DEFAULT; 1268 1269 for (ldCount = 0; ldCount < MAX_LOGICAL_DRIVES_EXT; ldCount++) { 1270 ld = MR_TargetIdToLdGet(ldCount, drv_map); 1271 if (ld >= MAX_LOGICAL_DRIVES_EXT) { 1272 lbInfo[ldCount].loadBalanceFlag = 0; 1273 continue; 1274 } 1275 1276 raid = MR_LdRaidGet(ld, drv_map); 1277 if ((raid->level != 1) || 1278 (raid->ldState != MR_LD_STATE_OPTIMAL)) { 1279 lbInfo[ldCount].loadBalanceFlag = 0; 1280 continue; 1281 } 1282 lbInfo[ldCount].loadBalanceFlag = 1; 1283 } 1284 } 1285 1286 u8 megasas_get_best_arm_pd(struct megasas_instance *instance, 1287 struct LD_LOAD_BALANCE_INFO *lbInfo, 1288 struct IO_REQUEST_INFO *io_info, 1289 struct MR_DRV_RAID_MAP_ALL *drv_map) 1290 { 1291 struct MR_LD_RAID *raid; 1292 u16 pd1_dev_handle; 1293 u16 pend0, pend1, ld; 1294 u64 diff0, diff1; 1295 u8 bestArm, pd0, pd1, span, arm; 1296 u32 arRef, span_row_size; 1297 1298 u64 block = io_info->ldStartBlock; 1299 u32 count = io_info->numBlocks; 1300 1301 span = ((io_info->span_arm & RAID_CTX_SPANARM_SPAN_MASK) 1302 >> RAID_CTX_SPANARM_SPAN_SHIFT); 1303 arm = (io_info->span_arm & RAID_CTX_SPANARM_ARM_MASK); 1304 1305 ld = MR_TargetIdToLdGet(io_info->ldTgtId, drv_map); 1306 raid = MR_LdRaidGet(ld, drv_map); 1307 span_row_size = instance->UnevenSpanSupport ? 1308 SPAN_ROW_SIZE(drv_map, ld, span) : raid->rowSize; 1309 1310 arRef = MR_LdSpanArrayGet(ld, span, drv_map); 1311 pd0 = MR_ArPdGet(arRef, arm, drv_map); 1312 pd1 = MR_ArPdGet(arRef, (arm + 1) >= span_row_size ? 1313 (arm + 1 - span_row_size) : arm + 1, drv_map); 1314 1315 /* Get PD1 Dev Handle */ 1316 1317 pd1_dev_handle = MR_PdDevHandleGet(pd1, drv_map); 1318 1319 if (pd1_dev_handle == MR_DEVHANDLE_INVALID) { 1320 bestArm = arm; 1321 } else { 1322 /* get the pending cmds for the data and mirror arms */ 1323 pend0 = atomic_read(&lbInfo->scsi_pending_cmds[pd0]); 1324 pend1 = atomic_read(&lbInfo->scsi_pending_cmds[pd1]); 1325 1326 /* Determine the disk whose head is nearer to the req. block */ 1327 diff0 = ABS_DIFF(block, lbInfo->last_accessed_block[pd0]); 1328 diff1 = ABS_DIFF(block, lbInfo->last_accessed_block[pd1]); 1329 bestArm = (diff0 <= diff1 ? arm : arm ^ 1); 1330 1331 /* Make balance count from 16 to 4 to 1332 * keep driver in sync with Firmware 1333 */ 1334 if ((bestArm == arm && pend0 > pend1 + lb_pending_cmds) || 1335 (bestArm != arm && pend1 > pend0 + lb_pending_cmds)) 1336 bestArm ^= 1; 1337 1338 /* Update the last accessed block on the correct pd */ 1339 io_info->span_arm = 1340 (span << RAID_CTX_SPANARM_SPAN_SHIFT) | bestArm; 1341 io_info->pd_after_lb = (bestArm == arm) ? pd0 : pd1; 1342 } 1343 1344 lbInfo->last_accessed_block[io_info->pd_after_lb] = block + count - 1; 1345 return io_info->pd_after_lb; 1346 } 1347 1348 __le16 get_updated_dev_handle(struct megasas_instance *instance, 1349 struct LD_LOAD_BALANCE_INFO *lbInfo, 1350 struct IO_REQUEST_INFO *io_info, 1351 struct MR_DRV_RAID_MAP_ALL *drv_map) 1352 { 1353 u8 arm_pd; 1354 __le16 devHandle; 1355 1356 /* get best new arm (PD ID) */ 1357 arm_pd = megasas_get_best_arm_pd(instance, lbInfo, io_info, drv_map); 1358 devHandle = MR_PdDevHandleGet(arm_pd, drv_map); 1359 io_info->pd_interface = MR_PdInterfaceTypeGet(arm_pd, drv_map); 1360 atomic_inc(&lbInfo->scsi_pending_cmds[arm_pd]); 1361 1362 return devHandle; 1363 } 1364