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