1 /* 2 * Linux MegaRAID driver for SAS based RAID controllers 3 * 4 * Copyright (c) 2009-2013 LSI Corporation 5 * Copyright (c) 2013-2016 Avago Technologies 6 * Copyright (c) 2016-2018 Broadcom Inc. 7 * 8 * This program is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU General Public License 10 * as published by the Free Software Foundation; either version 2 11 * of the License, or (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program. If not, see <http://www.gnu.org/licenses/>. 20 * 21 * FILE: megaraid_sas_fp.c 22 * 23 * Authors: Broadcom Inc. 24 * Sumant Patro 25 * Varad Talamacki 26 * Manoj Jose 27 * Kashyap Desai <kashyap.desai@broadcom.com> 28 * Sumit Saxena <sumit.saxena@broadcom.com> 29 * 30 * Send feedback to: megaraidlinux.pdl@broadcom.com 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 LB_PENDING_CMDS_DEFAULT 4 59 static unsigned int lb_pending_cmds = LB_PENDING_CMDS_DEFAULT; 60 module_param(lb_pending_cmds, int, S_IRUGO); 61 MODULE_PARM_DESC(lb_pending_cmds, "Change raid-1 load balancing outstanding " 62 "threshold. Valid Values are 1-128. Default: 4"); 63 64 65 #define ABS_DIFF(a, b) (((a) > (b)) ? ((a) - (b)) : ((b) - (a))) 66 #define MR_LD_STATE_OPTIMAL 3 67 68 #define SPAN_ROW_SIZE(map, ld, index_) (MR_LdSpanPtrGet(ld, index_, map)->spanRowSize) 69 #define SPAN_ROW_DATA_SIZE(map_, ld, index_) (MR_LdSpanPtrGet(ld, index_, map)->spanRowDataSize) 70 #define SPAN_INVALID 0xff 71 72 /* Prototypes */ 73 static void mr_update_span_set(struct MR_DRV_RAID_MAP_ALL *map, 74 PLD_SPAN_INFO ldSpanInfo); 75 static u8 mr_spanset_get_phy_params(struct megasas_instance *instance, u32 ld, 76 u64 stripRow, u16 stripRef, struct IO_REQUEST_INFO *io_info, 77 struct RAID_CONTEXT *pRAID_Context, struct MR_DRV_RAID_MAP_ALL *map); 78 static u64 get_row_from_strip(struct megasas_instance *instance, u32 ld, 79 u64 strip, struct MR_DRV_RAID_MAP_ALL *map); 80 81 u32 mega_mod64(u64 dividend, u32 divisor) 82 { 83 u64 d; 84 u32 remainder; 85 86 if (!divisor) 87 printk(KERN_ERR "megasas : DIVISOR is zero, in div fn\n"); 88 d = dividend; 89 remainder = do_div(d, divisor); 90 return remainder; 91 } 92 93 /** 94 * @param dividend : Dividend 95 * @param divisor : Divisor 96 * 97 * @return quotient 98 **/ 99 u64 mega_div64_32(uint64_t dividend, uint32_t divisor) 100 { 101 u32 remainder; 102 u64 d; 103 104 if (!divisor) 105 printk(KERN_ERR "megasas : DIVISOR is zero in mod fn\n"); 106 107 d = dividend; 108 remainder = do_div(d, divisor); 109 110 return d; 111 } 112 113 struct MR_LD_RAID *MR_LdRaidGet(u32 ld, struct MR_DRV_RAID_MAP_ALL *map) 114 { 115 return &map->raidMap.ldSpanMap[ld].ldRaid; 116 } 117 118 static struct MR_SPAN_BLOCK_INFO *MR_LdSpanInfoGet(u32 ld, 119 struct MR_DRV_RAID_MAP_ALL 120 *map) 121 { 122 return &map->raidMap.ldSpanMap[ld].spanBlock[0]; 123 } 124 125 static u8 MR_LdDataArmGet(u32 ld, u32 armIdx, struct MR_DRV_RAID_MAP_ALL *map) 126 { 127 return map->raidMap.ldSpanMap[ld].dataArmMap[armIdx]; 128 } 129 130 u16 MR_ArPdGet(u32 ar, u32 arm, struct MR_DRV_RAID_MAP_ALL *map) 131 { 132 return le16_to_cpu(map->raidMap.arMapInfo[ar].pd[arm]); 133 } 134 135 u16 MR_LdSpanArrayGet(u32 ld, u32 span, struct MR_DRV_RAID_MAP_ALL *map) 136 { 137 return le16_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].span.arrayRef); 138 } 139 140 __le16 MR_PdDevHandleGet(u32 pd, struct MR_DRV_RAID_MAP_ALL *map) 141 { 142 return map->raidMap.devHndlInfo[pd].curDevHdl; 143 } 144 145 static u8 MR_PdInterfaceTypeGet(u32 pd, struct MR_DRV_RAID_MAP_ALL *map) 146 { 147 return map->raidMap.devHndlInfo[pd].interfaceType; 148 } 149 150 u16 MR_GetLDTgtId(u32 ld, struct MR_DRV_RAID_MAP_ALL *map) 151 { 152 return le16_to_cpu(map->raidMap.ldSpanMap[ld].ldRaid.targetId); 153 } 154 155 u16 MR_TargetIdToLdGet(u32 ldTgtId, struct MR_DRV_RAID_MAP_ALL *map) 156 { 157 return map->raidMap.ldTgtIdToLd[ldTgtId]; 158 } 159 160 static struct MR_LD_SPAN *MR_LdSpanPtrGet(u32 ld, u32 span, 161 struct MR_DRV_RAID_MAP_ALL *map) 162 { 163 return &map->raidMap.ldSpanMap[ld].spanBlock[span].span; 164 } 165 166 /* 167 * This function will Populate Driver Map using firmware raid map 168 */ 169 static int MR_PopulateDrvRaidMap(struct megasas_instance *instance, u64 map_id) 170 { 171 struct fusion_context *fusion = instance->ctrl_context; 172 struct MR_FW_RAID_MAP_ALL *fw_map_old = NULL; 173 struct MR_FW_RAID_MAP *pFwRaidMap = NULL; 174 int i, j; 175 u16 ld_count; 176 struct MR_FW_RAID_MAP_DYNAMIC *fw_map_dyn; 177 struct MR_FW_RAID_MAP_EXT *fw_map_ext; 178 struct MR_RAID_MAP_DESC_TABLE *desc_table; 179 180 181 struct MR_DRV_RAID_MAP_ALL *drv_map = 182 fusion->ld_drv_map[(map_id & 1)]; 183 struct MR_DRV_RAID_MAP *pDrvRaidMap = &drv_map->raidMap; 184 void *raid_map_data = NULL; 185 186 memset(drv_map, 0, fusion->drv_map_sz); 187 memset(pDrvRaidMap->ldTgtIdToLd, 188 0xff, (sizeof(u16) * MAX_LOGICAL_DRIVES_DYN)); 189 190 if (instance->max_raid_mapsize) { 191 fw_map_dyn = fusion->ld_map[(map_id & 1)]; 192 desc_table = 193 (struct MR_RAID_MAP_DESC_TABLE *)((void *)fw_map_dyn + le32_to_cpu(fw_map_dyn->desc_table_offset)); 194 if (desc_table != fw_map_dyn->raid_map_desc_table) 195 dev_dbg(&instance->pdev->dev, "offsets of desc table are not matching desc %p original %p\n", 196 desc_table, fw_map_dyn->raid_map_desc_table); 197 198 ld_count = (u16)le16_to_cpu(fw_map_dyn->ld_count); 199 pDrvRaidMap->ldCount = (__le16)cpu_to_le16(ld_count); 200 pDrvRaidMap->fpPdIoTimeoutSec = 201 fw_map_dyn->fp_pd_io_timeout_sec; 202 pDrvRaidMap->totalSize = 203 cpu_to_le32(sizeof(struct MR_DRV_RAID_MAP_ALL)); 204 /* point to actual data starting point*/ 205 raid_map_data = (void *)fw_map_dyn + 206 le32_to_cpu(fw_map_dyn->desc_table_offset) + 207 le32_to_cpu(fw_map_dyn->desc_table_size); 208 209 for (i = 0; i < le32_to_cpu(fw_map_dyn->desc_table_num_elements); ++i) { 210 switch (le32_to_cpu(desc_table->raid_map_desc_type)) { 211 case RAID_MAP_DESC_TYPE_DEVHDL_INFO: 212 fw_map_dyn->dev_hndl_info = 213 (struct MR_DEV_HANDLE_INFO *)(raid_map_data + le32_to_cpu(desc_table->raid_map_desc_offset)); 214 memcpy(pDrvRaidMap->devHndlInfo, 215 fw_map_dyn->dev_hndl_info, 216 sizeof(struct MR_DEV_HANDLE_INFO) * 217 le32_to_cpu(desc_table->raid_map_desc_elements)); 218 break; 219 case RAID_MAP_DESC_TYPE_TGTID_INFO: 220 fw_map_dyn->ld_tgt_id_to_ld = 221 (u16 *)(raid_map_data + 222 le32_to_cpu(desc_table->raid_map_desc_offset)); 223 for (j = 0; j < le32_to_cpu(desc_table->raid_map_desc_elements); j++) { 224 pDrvRaidMap->ldTgtIdToLd[j] = 225 le16_to_cpu(fw_map_dyn->ld_tgt_id_to_ld[j]); 226 } 227 break; 228 case RAID_MAP_DESC_TYPE_ARRAY_INFO: 229 fw_map_dyn->ar_map_info = 230 (struct MR_ARRAY_INFO *) 231 (raid_map_data + le32_to_cpu(desc_table->raid_map_desc_offset)); 232 memcpy(pDrvRaidMap->arMapInfo, 233 fw_map_dyn->ar_map_info, 234 sizeof(struct MR_ARRAY_INFO) * 235 le32_to_cpu(desc_table->raid_map_desc_elements)); 236 break; 237 case RAID_MAP_DESC_TYPE_SPAN_INFO: 238 fw_map_dyn->ld_span_map = 239 (struct MR_LD_SPAN_MAP *) 240 (raid_map_data + 241 le32_to_cpu(desc_table->raid_map_desc_offset)); 242 memcpy(pDrvRaidMap->ldSpanMap, 243 fw_map_dyn->ld_span_map, 244 sizeof(struct MR_LD_SPAN_MAP) * 245 le32_to_cpu(desc_table->raid_map_desc_elements)); 246 break; 247 default: 248 dev_dbg(&instance->pdev->dev, "wrong number of desctableElements %d\n", 249 fw_map_dyn->desc_table_num_elements); 250 } 251 ++desc_table; 252 } 253 254 } else if (instance->supportmax256vd) { 255 fw_map_ext = 256 (struct MR_FW_RAID_MAP_EXT *)fusion->ld_map[(map_id & 1)]; 257 ld_count = (u16)le16_to_cpu(fw_map_ext->ldCount); 258 if (ld_count > MAX_LOGICAL_DRIVES_EXT) { 259 dev_dbg(&instance->pdev->dev, "megaraid_sas: LD count exposed in RAID map in not valid\n"); 260 return 1; 261 } 262 263 pDrvRaidMap->ldCount = (__le16)cpu_to_le16(ld_count); 264 pDrvRaidMap->fpPdIoTimeoutSec = fw_map_ext->fpPdIoTimeoutSec; 265 for (i = 0; i < (MAX_LOGICAL_DRIVES_EXT); i++) 266 pDrvRaidMap->ldTgtIdToLd[i] = 267 (u16)fw_map_ext->ldTgtIdToLd[i]; 268 memcpy(pDrvRaidMap->ldSpanMap, fw_map_ext->ldSpanMap, 269 sizeof(struct MR_LD_SPAN_MAP) * ld_count); 270 memcpy(pDrvRaidMap->arMapInfo, fw_map_ext->arMapInfo, 271 sizeof(struct MR_ARRAY_INFO) * MAX_API_ARRAYS_EXT); 272 memcpy(pDrvRaidMap->devHndlInfo, fw_map_ext->devHndlInfo, 273 sizeof(struct MR_DEV_HANDLE_INFO) * 274 MAX_RAIDMAP_PHYSICAL_DEVICES); 275 276 /* New Raid map will not set totalSize, so keep expected value 277 * for legacy code in ValidateMapInfo 278 */ 279 pDrvRaidMap->totalSize = 280 cpu_to_le32(sizeof(struct MR_FW_RAID_MAP_EXT)); 281 } else { 282 fw_map_old = (struct MR_FW_RAID_MAP_ALL *) 283 fusion->ld_map[(map_id & 1)]; 284 pFwRaidMap = &fw_map_old->raidMap; 285 ld_count = (u16)le32_to_cpu(pFwRaidMap->ldCount); 286 if (ld_count > MAX_LOGICAL_DRIVES) { 287 dev_dbg(&instance->pdev->dev, 288 "LD count exposed in RAID map in not valid\n"); 289 return 1; 290 } 291 292 pDrvRaidMap->totalSize = pFwRaidMap->totalSize; 293 pDrvRaidMap->ldCount = (__le16)cpu_to_le16(ld_count); 294 pDrvRaidMap->fpPdIoTimeoutSec = pFwRaidMap->fpPdIoTimeoutSec; 295 for (i = 0; i < MAX_RAIDMAP_LOGICAL_DRIVES + MAX_RAIDMAP_VIEWS; i++) 296 pDrvRaidMap->ldTgtIdToLd[i] = 297 (u8)pFwRaidMap->ldTgtIdToLd[i]; 298 for (i = 0; i < ld_count; i++) { 299 pDrvRaidMap->ldSpanMap[i] = pFwRaidMap->ldSpanMap[i]; 300 } 301 memcpy(pDrvRaidMap->arMapInfo, pFwRaidMap->arMapInfo, 302 sizeof(struct MR_ARRAY_INFO) * MAX_RAIDMAP_ARRAYS); 303 memcpy(pDrvRaidMap->devHndlInfo, pFwRaidMap->devHndlInfo, 304 sizeof(struct MR_DEV_HANDLE_INFO) * 305 MAX_RAIDMAP_PHYSICAL_DEVICES); 306 } 307 308 return 0; 309 } 310 311 /* 312 * This function will validate Map info data provided by FW 313 */ 314 u8 MR_ValidateMapInfo(struct megasas_instance *instance, u64 map_id) 315 { 316 struct fusion_context *fusion; 317 struct MR_DRV_RAID_MAP_ALL *drv_map; 318 struct MR_DRV_RAID_MAP *pDrvRaidMap; 319 struct LD_LOAD_BALANCE_INFO *lbInfo; 320 PLD_SPAN_INFO ldSpanInfo; 321 struct MR_LD_RAID *raid; 322 u16 num_lds, i; 323 u16 ld; 324 u32 expected_size; 325 326 if (MR_PopulateDrvRaidMap(instance, map_id)) 327 return 0; 328 329 fusion = instance->ctrl_context; 330 drv_map = fusion->ld_drv_map[(map_id & 1)]; 331 pDrvRaidMap = &drv_map->raidMap; 332 333 lbInfo = fusion->load_balance_info; 334 ldSpanInfo = fusion->log_to_span; 335 336 if (instance->max_raid_mapsize) 337 expected_size = sizeof(struct MR_DRV_RAID_MAP_ALL); 338 else if (instance->supportmax256vd) 339 expected_size = sizeof(struct MR_FW_RAID_MAP_EXT); 340 else 341 expected_size = 342 (sizeof(struct MR_FW_RAID_MAP) - sizeof(struct MR_LD_SPAN_MAP) + 343 (sizeof(struct MR_LD_SPAN_MAP) * le16_to_cpu(pDrvRaidMap->ldCount))); 344 345 if (le32_to_cpu(pDrvRaidMap->totalSize) != expected_size) { 346 dev_dbg(&instance->pdev->dev, "megasas: map info structure size 0x%x", 347 le32_to_cpu(pDrvRaidMap->totalSize)); 348 dev_dbg(&instance->pdev->dev, "is not matching expected size 0x%x\n", 349 (unsigned int)expected_size); 350 dev_err(&instance->pdev->dev, "megasas: span map %x, pDrvRaidMap->totalSize : %x\n", 351 (unsigned int)sizeof(struct MR_LD_SPAN_MAP), 352 le32_to_cpu(pDrvRaidMap->totalSize)); 353 return 0; 354 } 355 356 if (instance->UnevenSpanSupport) 357 mr_update_span_set(drv_map, ldSpanInfo); 358 359 if (lbInfo) 360 mr_update_load_balance_params(drv_map, lbInfo); 361 362 num_lds = le16_to_cpu(drv_map->raidMap.ldCount); 363 364 /*Convert Raid capability values to CPU arch */ 365 for (i = 0; (num_lds > 0) && (i < MAX_LOGICAL_DRIVES_EXT); i++) { 366 ld = MR_TargetIdToLdGet(i, drv_map); 367 368 /* For non existing VDs, iterate to next VD*/ 369 if (ld >= (MAX_LOGICAL_DRIVES_EXT - 1)) 370 continue; 371 372 raid = MR_LdRaidGet(ld, drv_map); 373 le32_to_cpus((u32 *)&raid->capability); 374 375 num_lds--; 376 } 377 378 return 1; 379 } 380 381 u32 MR_GetSpanBlock(u32 ld, u64 row, u64 *span_blk, 382 struct MR_DRV_RAID_MAP_ALL *map) 383 { 384 struct MR_SPAN_BLOCK_INFO *pSpanBlock = MR_LdSpanInfoGet(ld, map); 385 struct MR_QUAD_ELEMENT *quad; 386 struct MR_LD_RAID *raid = MR_LdRaidGet(ld, map); 387 u32 span, j; 388 389 for (span = 0; span < raid->spanDepth; span++, pSpanBlock++) { 390 391 for (j = 0; j < le32_to_cpu(pSpanBlock->block_span_info.noElements); j++) { 392 quad = &pSpanBlock->block_span_info.quad[j]; 393 394 if (le32_to_cpu(quad->diff) == 0) 395 return SPAN_INVALID; 396 if (le64_to_cpu(quad->logStart) <= row && row <= 397 le64_to_cpu(quad->logEnd) && (mega_mod64(row - le64_to_cpu(quad->logStart), 398 le32_to_cpu(quad->diff))) == 0) { 399 if (span_blk != NULL) { 400 u64 blk, debugBlk; 401 blk = mega_div64_32((row-le64_to_cpu(quad->logStart)), le32_to_cpu(quad->diff)); 402 debugBlk = blk; 403 404 blk = (blk + le64_to_cpu(quad->offsetInSpan)) << raid->stripeShift; 405 *span_blk = blk; 406 } 407 return span; 408 } 409 } 410 } 411 return SPAN_INVALID; 412 } 413 414 /* 415 ****************************************************************************** 416 * 417 * This routine calculates the Span block for given row using spanset. 418 * 419 * Inputs : 420 * instance - HBA instance 421 * ld - Logical drive number 422 * row - Row number 423 * map - LD map 424 * 425 * Outputs : 426 * 427 * span - Span number 428 * block - Absolute Block number in the physical disk 429 * div_error - Devide error code. 430 */ 431 432 u32 mr_spanset_get_span_block(struct megasas_instance *instance, 433 u32 ld, u64 row, u64 *span_blk, struct MR_DRV_RAID_MAP_ALL *map) 434 { 435 struct fusion_context *fusion = instance->ctrl_context; 436 struct MR_LD_RAID *raid = MR_LdRaidGet(ld, map); 437 LD_SPAN_SET *span_set; 438 struct MR_QUAD_ELEMENT *quad; 439 u32 span, info; 440 PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span; 441 442 for (info = 0; info < MAX_QUAD_DEPTH; info++) { 443 span_set = &(ldSpanInfo[ld].span_set[info]); 444 445 if (span_set->span_row_data_width == 0) 446 break; 447 448 if (row > span_set->data_row_end) 449 continue; 450 451 for (span = 0; span < raid->spanDepth; span++) 452 if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span]. 453 block_span_info.noElements) >= info+1) { 454 quad = &map->raidMap.ldSpanMap[ld]. 455 spanBlock[span]. 456 block_span_info.quad[info]; 457 if (le32_to_cpu(quad->diff) == 0) 458 return SPAN_INVALID; 459 if (le64_to_cpu(quad->logStart) <= row && 460 row <= le64_to_cpu(quad->logEnd) && 461 (mega_mod64(row - le64_to_cpu(quad->logStart), 462 le32_to_cpu(quad->diff))) == 0) { 463 if (span_blk != NULL) { 464 u64 blk; 465 blk = mega_div64_32 466 ((row - le64_to_cpu(quad->logStart)), 467 le32_to_cpu(quad->diff)); 468 blk = (blk + le64_to_cpu(quad->offsetInSpan)) 469 << raid->stripeShift; 470 *span_blk = blk; 471 } 472 return span; 473 } 474 } 475 } 476 return SPAN_INVALID; 477 } 478 479 /* 480 ****************************************************************************** 481 * 482 * This routine calculates the row for given strip using spanset. 483 * 484 * Inputs : 485 * instance - HBA instance 486 * ld - Logical drive number 487 * Strip - Strip 488 * map - LD map 489 * 490 * Outputs : 491 * 492 * row - row associated with strip 493 */ 494 495 static u64 get_row_from_strip(struct megasas_instance *instance, 496 u32 ld, u64 strip, struct MR_DRV_RAID_MAP_ALL *map) 497 { 498 struct fusion_context *fusion = instance->ctrl_context; 499 struct MR_LD_RAID *raid = MR_LdRaidGet(ld, map); 500 LD_SPAN_SET *span_set; 501 PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span; 502 u32 info, strip_offset, span, span_offset; 503 u64 span_set_Strip, span_set_Row, retval; 504 505 for (info = 0; info < MAX_QUAD_DEPTH; info++) { 506 span_set = &(ldSpanInfo[ld].span_set[info]); 507 508 if (span_set->span_row_data_width == 0) 509 break; 510 if (strip > span_set->data_strip_end) 511 continue; 512 513 span_set_Strip = strip - span_set->data_strip_start; 514 strip_offset = mega_mod64(span_set_Strip, 515 span_set->span_row_data_width); 516 span_set_Row = mega_div64_32(span_set_Strip, 517 span_set->span_row_data_width) * span_set->diff; 518 for (span = 0, span_offset = 0; span < raid->spanDepth; span++) 519 if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span]. 520 block_span_info.noElements) >= info+1) { 521 if (strip_offset >= 522 span_set->strip_offset[span]) 523 span_offset++; 524 else 525 break; 526 } 527 528 retval = (span_set->data_row_start + span_set_Row + 529 (span_offset - 1)); 530 return retval; 531 } 532 return -1LLU; 533 } 534 535 536 /* 537 ****************************************************************************** 538 * 539 * This routine calculates the Start Strip for given row using spanset. 540 * 541 * Inputs : 542 * instance - HBA instance 543 * ld - Logical drive number 544 * row - Row number 545 * map - LD map 546 * 547 * Outputs : 548 * 549 * Strip - Start strip associated with row 550 */ 551 552 static u64 get_strip_from_row(struct megasas_instance *instance, 553 u32 ld, u64 row, struct MR_DRV_RAID_MAP_ALL *map) 554 { 555 struct fusion_context *fusion = instance->ctrl_context; 556 struct MR_LD_RAID *raid = MR_LdRaidGet(ld, map); 557 LD_SPAN_SET *span_set; 558 struct MR_QUAD_ELEMENT *quad; 559 PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span; 560 u32 span, info; 561 u64 strip; 562 563 for (info = 0; info < MAX_QUAD_DEPTH; info++) { 564 span_set = &(ldSpanInfo[ld].span_set[info]); 565 566 if (span_set->span_row_data_width == 0) 567 break; 568 if (row > span_set->data_row_end) 569 continue; 570 571 for (span = 0; span < raid->spanDepth; span++) 572 if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span]. 573 block_span_info.noElements) >= info+1) { 574 quad = &map->raidMap.ldSpanMap[ld]. 575 spanBlock[span].block_span_info.quad[info]; 576 if (le64_to_cpu(quad->logStart) <= row && 577 row <= le64_to_cpu(quad->logEnd) && 578 mega_mod64((row - le64_to_cpu(quad->logStart)), 579 le32_to_cpu(quad->diff)) == 0) { 580 strip = mega_div64_32 581 (((row - span_set->data_row_start) 582 - le64_to_cpu(quad->logStart)), 583 le32_to_cpu(quad->diff)); 584 strip *= span_set->span_row_data_width; 585 strip += span_set->data_strip_start; 586 strip += span_set->strip_offset[span]; 587 return strip; 588 } 589 } 590 } 591 dev_err(&instance->pdev->dev, "get_strip_from_row" 592 "returns invalid strip for ld=%x, row=%lx\n", 593 ld, (long unsigned int)row); 594 return -1; 595 } 596 597 /* 598 ****************************************************************************** 599 * 600 * This routine calculates the Physical Arm for given strip using spanset. 601 * 602 * Inputs : 603 * instance - HBA instance 604 * ld - Logical drive number 605 * strip - Strip 606 * map - LD map 607 * 608 * Outputs : 609 * 610 * Phys Arm - Phys Arm associated with strip 611 */ 612 613 static u32 get_arm_from_strip(struct megasas_instance *instance, 614 u32 ld, u64 strip, struct MR_DRV_RAID_MAP_ALL *map) 615 { 616 struct fusion_context *fusion = instance->ctrl_context; 617 struct MR_LD_RAID *raid = MR_LdRaidGet(ld, map); 618 LD_SPAN_SET *span_set; 619 PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span; 620 u32 info, strip_offset, span, span_offset, retval; 621 622 for (info = 0 ; info < MAX_QUAD_DEPTH; info++) { 623 span_set = &(ldSpanInfo[ld].span_set[info]); 624 625 if (span_set->span_row_data_width == 0) 626 break; 627 if (strip > span_set->data_strip_end) 628 continue; 629 630 strip_offset = (uint)mega_mod64 631 ((strip - span_set->data_strip_start), 632 span_set->span_row_data_width); 633 634 for (span = 0, span_offset = 0; span < raid->spanDepth; span++) 635 if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span]. 636 block_span_info.noElements) >= info+1) { 637 if (strip_offset >= 638 span_set->strip_offset[span]) 639 span_offset = 640 span_set->strip_offset[span]; 641 else 642 break; 643 } 644 645 retval = (strip_offset - span_offset); 646 return retval; 647 } 648 649 dev_err(&instance->pdev->dev, "get_arm_from_strip" 650 "returns invalid arm for ld=%x strip=%lx\n", 651 ld, (long unsigned int)strip); 652 653 return -1; 654 } 655 656 /* This Function will return Phys arm */ 657 u8 get_arm(struct megasas_instance *instance, u32 ld, u8 span, u64 stripe, 658 struct MR_DRV_RAID_MAP_ALL *map) 659 { 660 struct MR_LD_RAID *raid = MR_LdRaidGet(ld, map); 661 /* Need to check correct default value */ 662 u32 arm = 0; 663 664 switch (raid->level) { 665 case 0: 666 case 5: 667 case 6: 668 arm = mega_mod64(stripe, SPAN_ROW_SIZE(map, ld, span)); 669 break; 670 case 1: 671 /* start with logical arm */ 672 arm = get_arm_from_strip(instance, ld, stripe, map); 673 if (arm != -1U) 674 arm *= 2; 675 break; 676 } 677 678 return arm; 679 } 680 681 682 /* 683 ****************************************************************************** 684 * 685 * This routine calculates the arm, span and block for the specified stripe and 686 * reference in stripe using spanset 687 * 688 * Inputs : 689 * 690 * ld - Logical drive number 691 * stripRow - Stripe number 692 * stripRef - Reference in stripe 693 * 694 * Outputs : 695 * 696 * span - Span number 697 * block - Absolute Block number in the physical disk 698 */ 699 static u8 mr_spanset_get_phy_params(struct megasas_instance *instance, u32 ld, 700 u64 stripRow, u16 stripRef, struct IO_REQUEST_INFO *io_info, 701 struct RAID_CONTEXT *pRAID_Context, 702 struct MR_DRV_RAID_MAP_ALL *map) 703 { 704 struct MR_LD_RAID *raid = MR_LdRaidGet(ld, map); 705 u32 pd, arRef, r1_alt_pd; 706 u8 physArm, span; 707 u64 row; 708 u8 retval = true; 709 u64 *pdBlock = &io_info->pdBlock; 710 __le16 *pDevHandle = &io_info->devHandle; 711 u8 *pPdInterface = &io_info->pd_interface; 712 u32 logArm, rowMod, armQ, arm; 713 struct fusion_context *fusion; 714 715 fusion = instance->ctrl_context; 716 *pDevHandle = cpu_to_le16(MR_DEVHANDLE_INVALID); 717 718 /*Get row and span from io_info for Uneven Span IO.*/ 719 row = io_info->start_row; 720 span = io_info->start_span; 721 722 723 if (raid->level == 6) { 724 logArm = get_arm_from_strip(instance, ld, stripRow, map); 725 if (logArm == -1U) 726 return false; 727 rowMod = mega_mod64(row, SPAN_ROW_SIZE(map, ld, span)); 728 armQ = SPAN_ROW_SIZE(map, ld, span) - 1 - rowMod; 729 arm = armQ + 1 + logArm; 730 if (arm >= SPAN_ROW_SIZE(map, ld, span)) 731 arm -= SPAN_ROW_SIZE(map, ld, span); 732 physArm = (u8)arm; 733 } else 734 /* Calculate the arm */ 735 physArm = get_arm(instance, ld, span, stripRow, map); 736 if (physArm == 0xFF) 737 return false; 738 739 arRef = MR_LdSpanArrayGet(ld, span, map); 740 pd = MR_ArPdGet(arRef, physArm, map); 741 742 if (pd != MR_PD_INVALID) { 743 *pDevHandle = MR_PdDevHandleGet(pd, map); 744 *pPdInterface = MR_PdInterfaceTypeGet(pd, map); 745 /* get second pd also for raid 1/10 fast path writes*/ 746 if ((instance->adapter_type >= VENTURA_SERIES) && 747 (raid->level == 1) && 748 !io_info->isRead) { 749 r1_alt_pd = MR_ArPdGet(arRef, physArm + 1, map); 750 if (r1_alt_pd != MR_PD_INVALID) 751 io_info->r1_alt_dev_handle = 752 MR_PdDevHandleGet(r1_alt_pd, map); 753 } 754 } else { 755 if ((raid->level >= 5) && 756 ((instance->adapter_type == THUNDERBOLT_SERIES) || 757 ((instance->adapter_type == INVADER_SERIES) && 758 (raid->regTypeReqOnRead != REGION_TYPE_UNUSED)))) 759 pRAID_Context->reg_lock_flags = REGION_TYPE_EXCLUSIVE; 760 else if (raid->level == 1) { 761 physArm = physArm + 1; 762 pd = MR_ArPdGet(arRef, physArm, map); 763 if (pd != MR_PD_INVALID) { 764 *pDevHandle = MR_PdDevHandleGet(pd, map); 765 *pPdInterface = MR_PdInterfaceTypeGet(pd, map); 766 } 767 } 768 } 769 770 *pdBlock += stripRef + le64_to_cpu(MR_LdSpanPtrGet(ld, span, map)->startBlk); 771 if (instance->adapter_type >= VENTURA_SERIES) { 772 ((struct RAID_CONTEXT_G35 *)pRAID_Context)->span_arm = 773 (span << RAID_CTX_SPANARM_SPAN_SHIFT) | physArm; 774 io_info->span_arm = 775 (span << RAID_CTX_SPANARM_SPAN_SHIFT) | physArm; 776 } else { 777 pRAID_Context->span_arm = 778 (span << RAID_CTX_SPANARM_SPAN_SHIFT) | physArm; 779 io_info->span_arm = pRAID_Context->span_arm; 780 } 781 io_info->pd_after_lb = pd; 782 return retval; 783 } 784 785 /* 786 ****************************************************************************** 787 * 788 * This routine calculates the arm, span and block for the specified stripe and 789 * reference in stripe. 790 * 791 * Inputs : 792 * 793 * ld - Logical drive number 794 * stripRow - Stripe number 795 * stripRef - Reference in stripe 796 * 797 * Outputs : 798 * 799 * span - Span number 800 * block - Absolute Block number in the physical disk 801 */ 802 u8 MR_GetPhyParams(struct megasas_instance *instance, u32 ld, u64 stripRow, 803 u16 stripRef, struct IO_REQUEST_INFO *io_info, 804 struct RAID_CONTEXT *pRAID_Context, 805 struct MR_DRV_RAID_MAP_ALL *map) 806 { 807 struct MR_LD_RAID *raid = MR_LdRaidGet(ld, map); 808 u32 pd, arRef, r1_alt_pd; 809 u8 physArm, span; 810 u64 row; 811 u8 retval = true; 812 u64 *pdBlock = &io_info->pdBlock; 813 __le16 *pDevHandle = &io_info->devHandle; 814 u8 *pPdInterface = &io_info->pd_interface; 815 struct fusion_context *fusion; 816 817 fusion = instance->ctrl_context; 818 *pDevHandle = cpu_to_le16(MR_DEVHANDLE_INVALID); 819 820 row = mega_div64_32(stripRow, raid->rowDataSize); 821 822 if (raid->level == 6) { 823 /* logical arm within row */ 824 u32 logArm = mega_mod64(stripRow, raid->rowDataSize); 825 u32 rowMod, armQ, arm; 826 827 if (raid->rowSize == 0) 828 return false; 829 /* get logical row mod */ 830 rowMod = mega_mod64(row, raid->rowSize); 831 armQ = raid->rowSize-1-rowMod; /* index of Q drive */ 832 arm = armQ+1+logArm; /* data always logically follows Q */ 833 if (arm >= raid->rowSize) /* handle wrap condition */ 834 arm -= raid->rowSize; 835 physArm = (u8)arm; 836 } else { 837 if (raid->modFactor == 0) 838 return false; 839 physArm = MR_LdDataArmGet(ld, mega_mod64(stripRow, 840 raid->modFactor), 841 map); 842 } 843 844 if (raid->spanDepth == 1) { 845 span = 0; 846 *pdBlock = row << raid->stripeShift; 847 } else { 848 span = (u8)MR_GetSpanBlock(ld, row, pdBlock, map); 849 if (span == SPAN_INVALID) 850 return false; 851 } 852 853 /* Get the array on which this span is present */ 854 arRef = MR_LdSpanArrayGet(ld, span, map); 855 pd = MR_ArPdGet(arRef, physArm, map); /* Get the pd */ 856 857 if (pd != MR_PD_INVALID) { 858 /* Get dev handle from Pd. */ 859 *pDevHandle = MR_PdDevHandleGet(pd, map); 860 *pPdInterface = MR_PdInterfaceTypeGet(pd, map); 861 /* get second pd also for raid 1/10 fast path writes*/ 862 if ((instance->adapter_type >= VENTURA_SERIES) && 863 (raid->level == 1) && 864 !io_info->isRead) { 865 r1_alt_pd = MR_ArPdGet(arRef, physArm + 1, map); 866 if (r1_alt_pd != MR_PD_INVALID) 867 io_info->r1_alt_dev_handle = 868 MR_PdDevHandleGet(r1_alt_pd, map); 869 } 870 } else { 871 if ((raid->level >= 5) && 872 ((instance->adapter_type == THUNDERBOLT_SERIES) || 873 ((instance->adapter_type == INVADER_SERIES) && 874 (raid->regTypeReqOnRead != REGION_TYPE_UNUSED)))) 875 pRAID_Context->reg_lock_flags = REGION_TYPE_EXCLUSIVE; 876 else if (raid->level == 1) { 877 /* Get alternate Pd. */ 878 physArm = physArm + 1; 879 pd = MR_ArPdGet(arRef, physArm, map); 880 if (pd != MR_PD_INVALID) { 881 /* Get dev handle from Pd */ 882 *pDevHandle = MR_PdDevHandleGet(pd, map); 883 *pPdInterface = MR_PdInterfaceTypeGet(pd, map); 884 } 885 } 886 } 887 888 *pdBlock += stripRef + le64_to_cpu(MR_LdSpanPtrGet(ld, span, map)->startBlk); 889 if (instance->adapter_type >= VENTURA_SERIES) { 890 ((struct RAID_CONTEXT_G35 *)pRAID_Context)->span_arm = 891 (span << RAID_CTX_SPANARM_SPAN_SHIFT) | physArm; 892 io_info->span_arm = 893 (span << RAID_CTX_SPANARM_SPAN_SHIFT) | physArm; 894 } else { 895 pRAID_Context->span_arm = 896 (span << RAID_CTX_SPANARM_SPAN_SHIFT) | physArm; 897 io_info->span_arm = pRAID_Context->span_arm; 898 } 899 io_info->pd_after_lb = pd; 900 return retval; 901 } 902 903 /* 904 ****************************************************************************** 905 * 906 * MR_BuildRaidContext function 907 * 908 * This function will initiate command processing. The start/end row and strip 909 * information is calculated then the lock is acquired. 910 * This function will return 0 if region lock was acquired OR return num strips 911 */ 912 u8 913 MR_BuildRaidContext(struct megasas_instance *instance, 914 struct IO_REQUEST_INFO *io_info, 915 struct RAID_CONTEXT *pRAID_Context, 916 struct MR_DRV_RAID_MAP_ALL *map, u8 **raidLUN) 917 { 918 struct fusion_context *fusion; 919 struct MR_LD_RAID *raid; 920 u32 stripSize, stripe_mask; 921 u64 endLba, endStrip, endRow, start_row, start_strip; 922 u64 regStart; 923 u32 regSize; 924 u8 num_strips, numRows; 925 u16 ref_in_start_stripe, ref_in_end_stripe; 926 u64 ldStartBlock; 927 u32 numBlocks, ldTgtId; 928 u8 isRead; 929 u8 retval = 0; 930 u8 startlba_span = SPAN_INVALID; 931 u64 *pdBlock = &io_info->pdBlock; 932 u16 ld; 933 934 ldStartBlock = io_info->ldStartBlock; 935 numBlocks = io_info->numBlocks; 936 ldTgtId = io_info->ldTgtId; 937 isRead = io_info->isRead; 938 io_info->IoforUnevenSpan = 0; 939 io_info->start_span = SPAN_INVALID; 940 fusion = instance->ctrl_context; 941 942 ld = MR_TargetIdToLdGet(ldTgtId, map); 943 raid = MR_LdRaidGet(ld, map); 944 /*check read ahead bit*/ 945 io_info->ra_capable = raid->capability.ra_capable; 946 947 /* 948 * if rowDataSize @RAID map and spanRowDataSize @SPAN INFO are zero 949 * return FALSE 950 */ 951 if (raid->rowDataSize == 0) { 952 if (MR_LdSpanPtrGet(ld, 0, map)->spanRowDataSize == 0) 953 return false; 954 else if (instance->UnevenSpanSupport) { 955 io_info->IoforUnevenSpan = 1; 956 } else { 957 dev_info(&instance->pdev->dev, 958 "raid->rowDataSize is 0, but has SPAN[0]" 959 "rowDataSize = 0x%0x," 960 "but there is _NO_ UnevenSpanSupport\n", 961 MR_LdSpanPtrGet(ld, 0, map)->spanRowDataSize); 962 return false; 963 } 964 } 965 966 stripSize = 1 << raid->stripeShift; 967 stripe_mask = stripSize-1; 968 969 970 /* 971 * calculate starting row and stripe, and number of strips and rows 972 */ 973 start_strip = ldStartBlock >> raid->stripeShift; 974 ref_in_start_stripe = (u16)(ldStartBlock & stripe_mask); 975 endLba = ldStartBlock + numBlocks - 1; 976 ref_in_end_stripe = (u16)(endLba & stripe_mask); 977 endStrip = endLba >> raid->stripeShift; 978 num_strips = (u8)(endStrip - start_strip + 1); /* End strip */ 979 980 if (io_info->IoforUnevenSpan) { 981 start_row = get_row_from_strip(instance, ld, start_strip, map); 982 endRow = get_row_from_strip(instance, ld, endStrip, map); 983 if (start_row == -1ULL || endRow == -1ULL) { 984 dev_info(&instance->pdev->dev, "return from %s %d." 985 "Send IO w/o region lock.\n", 986 __func__, __LINE__); 987 return false; 988 } 989 990 if (raid->spanDepth == 1) { 991 startlba_span = 0; 992 *pdBlock = start_row << raid->stripeShift; 993 } else 994 startlba_span = (u8)mr_spanset_get_span_block(instance, 995 ld, start_row, pdBlock, map); 996 if (startlba_span == SPAN_INVALID) { 997 dev_info(&instance->pdev->dev, "return from %s %d" 998 "for row 0x%llx,start strip %llx" 999 "endSrip %llx\n", __func__, __LINE__, 1000 (unsigned long long)start_row, 1001 (unsigned long long)start_strip, 1002 (unsigned long long)endStrip); 1003 return false; 1004 } 1005 io_info->start_span = startlba_span; 1006 io_info->start_row = start_row; 1007 } else { 1008 start_row = mega_div64_32(start_strip, raid->rowDataSize); 1009 endRow = mega_div64_32(endStrip, raid->rowDataSize); 1010 } 1011 numRows = (u8)(endRow - start_row + 1); 1012 1013 /* 1014 * calculate region info. 1015 */ 1016 1017 /* assume region is at the start of the first row */ 1018 regStart = start_row << raid->stripeShift; 1019 /* assume this IO needs the full row - we'll adjust if not true */ 1020 regSize = stripSize; 1021 1022 io_info->do_fp_rlbypass = raid->capability.fpBypassRegionLock; 1023 1024 /* Check if we can send this I/O via FastPath */ 1025 if (raid->capability.fpCapable) { 1026 if (isRead) 1027 io_info->fpOkForIo = (raid->capability.fpReadCapable && 1028 ((num_strips == 1) || 1029 raid->capability. 1030 fpReadAcrossStripe)); 1031 else 1032 io_info->fpOkForIo = (raid->capability.fpWriteCapable && 1033 ((num_strips == 1) || 1034 raid->capability. 1035 fpWriteAcrossStripe)); 1036 } else 1037 io_info->fpOkForIo = false; 1038 1039 if (numRows == 1) { 1040 /* single-strip IOs can always lock only the data needed */ 1041 if (num_strips == 1) { 1042 regStart += ref_in_start_stripe; 1043 regSize = numBlocks; 1044 } 1045 /* multi-strip IOs always need to full stripe locked */ 1046 } else if (io_info->IoforUnevenSpan == 0) { 1047 /* 1048 * For Even span region lock optimization. 1049 * If the start strip is the last in the start row 1050 */ 1051 if (start_strip == (start_row + 1) * raid->rowDataSize - 1) { 1052 regStart += ref_in_start_stripe; 1053 /* initialize count to sectors from startref to end 1054 of strip */ 1055 regSize = stripSize - ref_in_start_stripe; 1056 } 1057 1058 /* add complete rows in the middle of the transfer */ 1059 if (numRows > 2) 1060 regSize += (numRows-2) << raid->stripeShift; 1061 1062 /* if IO ends within first strip of last row*/ 1063 if (endStrip == endRow*raid->rowDataSize) 1064 regSize += ref_in_end_stripe+1; 1065 else 1066 regSize += stripSize; 1067 } else { 1068 /* 1069 * For Uneven span region lock optimization. 1070 * If the start strip is the last in the start row 1071 */ 1072 if (start_strip == (get_strip_from_row(instance, ld, start_row, map) + 1073 SPAN_ROW_DATA_SIZE(map, ld, startlba_span) - 1)) { 1074 regStart += ref_in_start_stripe; 1075 /* initialize count to sectors from 1076 * startRef to end of strip 1077 */ 1078 regSize = stripSize - ref_in_start_stripe; 1079 } 1080 /* Add complete rows in the middle of the transfer*/ 1081 1082 if (numRows > 2) 1083 /* Add complete rows in the middle of the transfer*/ 1084 regSize += (numRows-2) << raid->stripeShift; 1085 1086 /* if IO ends within first strip of last row */ 1087 if (endStrip == get_strip_from_row(instance, ld, endRow, map)) 1088 regSize += ref_in_end_stripe + 1; 1089 else 1090 regSize += stripSize; 1091 } 1092 1093 pRAID_Context->timeout_value = 1094 cpu_to_le16(raid->fpIoTimeoutForLd ? 1095 raid->fpIoTimeoutForLd : 1096 map->raidMap.fpPdIoTimeoutSec); 1097 if (instance->adapter_type == INVADER_SERIES) 1098 pRAID_Context->reg_lock_flags = (isRead) ? 1099 raid->regTypeReqOnRead : raid->regTypeReqOnWrite; 1100 else if (instance->adapter_type == THUNDERBOLT_SERIES) 1101 pRAID_Context->reg_lock_flags = (isRead) ? 1102 REGION_TYPE_SHARED_READ : raid->regTypeReqOnWrite; 1103 pRAID_Context->virtual_disk_tgt_id = raid->targetId; 1104 pRAID_Context->reg_lock_row_lba = cpu_to_le64(regStart); 1105 pRAID_Context->reg_lock_length = cpu_to_le32(regSize); 1106 pRAID_Context->config_seq_num = raid->seqNum; 1107 /* save pointer to raid->LUN array */ 1108 *raidLUN = raid->LUN; 1109 1110 1111 /*Get Phy Params only if FP capable, or else leave it to MR firmware 1112 to do the calculation.*/ 1113 if (io_info->fpOkForIo) { 1114 retval = io_info->IoforUnevenSpan ? 1115 mr_spanset_get_phy_params(instance, ld, 1116 start_strip, ref_in_start_stripe, 1117 io_info, pRAID_Context, map) : 1118 MR_GetPhyParams(instance, ld, start_strip, 1119 ref_in_start_stripe, io_info, 1120 pRAID_Context, map); 1121 /* If IO on an invalid Pd, then FP is not possible.*/ 1122 if (io_info->devHandle == MR_DEVHANDLE_INVALID) 1123 io_info->fpOkForIo = false; 1124 return retval; 1125 } else if (isRead) { 1126 uint stripIdx; 1127 for (stripIdx = 0; stripIdx < num_strips; stripIdx++) { 1128 retval = io_info->IoforUnevenSpan ? 1129 mr_spanset_get_phy_params(instance, ld, 1130 start_strip + stripIdx, 1131 ref_in_start_stripe, io_info, 1132 pRAID_Context, map) : 1133 MR_GetPhyParams(instance, ld, 1134 start_strip + stripIdx, ref_in_start_stripe, 1135 io_info, pRAID_Context, map); 1136 if (!retval) 1137 return true; 1138 } 1139 } 1140 return true; 1141 } 1142 1143 /* 1144 ****************************************************************************** 1145 * 1146 * This routine pepare spanset info from Valid Raid map and store it into 1147 * local copy of ldSpanInfo per instance data structure. 1148 * 1149 * Inputs : 1150 * map - LD map 1151 * ldSpanInfo - ldSpanInfo per HBA instance 1152 * 1153 */ 1154 void mr_update_span_set(struct MR_DRV_RAID_MAP_ALL *map, 1155 PLD_SPAN_INFO ldSpanInfo) 1156 { 1157 u8 span, count; 1158 u32 element, span_row_width; 1159 u64 span_row; 1160 struct MR_LD_RAID *raid; 1161 LD_SPAN_SET *span_set, *span_set_prev; 1162 struct MR_QUAD_ELEMENT *quad; 1163 int ldCount; 1164 u16 ld; 1165 1166 1167 for (ldCount = 0; ldCount < MAX_LOGICAL_DRIVES_EXT; ldCount++) { 1168 ld = MR_TargetIdToLdGet(ldCount, map); 1169 if (ld >= (MAX_LOGICAL_DRIVES_EXT - 1)) 1170 continue; 1171 raid = MR_LdRaidGet(ld, map); 1172 for (element = 0; element < MAX_QUAD_DEPTH; element++) { 1173 for (span = 0; span < raid->spanDepth; span++) { 1174 if (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span]. 1175 block_span_info.noElements) < 1176 element + 1) 1177 continue; 1178 span_set = &(ldSpanInfo[ld].span_set[element]); 1179 quad = &map->raidMap.ldSpanMap[ld]. 1180 spanBlock[span].block_span_info. 1181 quad[element]; 1182 1183 span_set->diff = le32_to_cpu(quad->diff); 1184 1185 for (count = 0, span_row_width = 0; 1186 count < raid->spanDepth; count++) { 1187 if (le32_to_cpu(map->raidMap.ldSpanMap[ld]. 1188 spanBlock[count]. 1189 block_span_info. 1190 noElements) >= element + 1) { 1191 span_set->strip_offset[count] = 1192 span_row_width; 1193 span_row_width += 1194 MR_LdSpanPtrGet 1195 (ld, count, map)->spanRowDataSize; 1196 } 1197 } 1198 1199 span_set->span_row_data_width = span_row_width; 1200 span_row = mega_div64_32(((le64_to_cpu(quad->logEnd) - 1201 le64_to_cpu(quad->logStart)) + le32_to_cpu(quad->diff)), 1202 le32_to_cpu(quad->diff)); 1203 1204 if (element == 0) { 1205 span_set->log_start_lba = 0; 1206 span_set->log_end_lba = 1207 ((span_row << raid->stripeShift) 1208 * span_row_width) - 1; 1209 1210 span_set->span_row_start = 0; 1211 span_set->span_row_end = span_row - 1; 1212 1213 span_set->data_strip_start = 0; 1214 span_set->data_strip_end = 1215 (span_row * span_row_width) - 1; 1216 1217 span_set->data_row_start = 0; 1218 span_set->data_row_end = 1219 (span_row * le32_to_cpu(quad->diff)) - 1; 1220 } else { 1221 span_set_prev = &(ldSpanInfo[ld]. 1222 span_set[element - 1]); 1223 span_set->log_start_lba = 1224 span_set_prev->log_end_lba + 1; 1225 span_set->log_end_lba = 1226 span_set->log_start_lba + 1227 ((span_row << raid->stripeShift) 1228 * span_row_width) - 1; 1229 1230 span_set->span_row_start = 1231 span_set_prev->span_row_end + 1; 1232 span_set->span_row_end = 1233 span_set->span_row_start + span_row - 1; 1234 1235 span_set->data_strip_start = 1236 span_set_prev->data_strip_end + 1; 1237 span_set->data_strip_end = 1238 span_set->data_strip_start + 1239 (span_row * span_row_width) - 1; 1240 1241 span_set->data_row_start = 1242 span_set_prev->data_row_end + 1; 1243 span_set->data_row_end = 1244 span_set->data_row_start + 1245 (span_row * le32_to_cpu(quad->diff)) - 1; 1246 } 1247 break; 1248 } 1249 if (span == raid->spanDepth) 1250 break; 1251 } 1252 } 1253 } 1254 1255 void mr_update_load_balance_params(struct MR_DRV_RAID_MAP_ALL *drv_map, 1256 struct LD_LOAD_BALANCE_INFO *lbInfo) 1257 { 1258 int ldCount; 1259 u16 ld; 1260 struct MR_LD_RAID *raid; 1261 1262 if (lb_pending_cmds > 128 || lb_pending_cmds < 1) 1263 lb_pending_cmds = LB_PENDING_CMDS_DEFAULT; 1264 1265 for (ldCount = 0; ldCount < MAX_LOGICAL_DRIVES_EXT; ldCount++) { 1266 ld = MR_TargetIdToLdGet(ldCount, drv_map); 1267 if (ld >= MAX_LOGICAL_DRIVES_EXT - 1) { 1268 lbInfo[ldCount].loadBalanceFlag = 0; 1269 continue; 1270 } 1271 1272 raid = MR_LdRaidGet(ld, drv_map); 1273 if ((raid->level != 1) || 1274 (raid->ldState != MR_LD_STATE_OPTIMAL)) { 1275 lbInfo[ldCount].loadBalanceFlag = 0; 1276 continue; 1277 } 1278 lbInfo[ldCount].loadBalanceFlag = 1; 1279 } 1280 } 1281 1282 u8 megasas_get_best_arm_pd(struct megasas_instance *instance, 1283 struct LD_LOAD_BALANCE_INFO *lbInfo, 1284 struct IO_REQUEST_INFO *io_info, 1285 struct MR_DRV_RAID_MAP_ALL *drv_map) 1286 { 1287 struct MR_LD_RAID *raid; 1288 u16 pd1_dev_handle; 1289 u16 pend0, pend1, ld; 1290 u64 diff0, diff1; 1291 u8 bestArm, pd0, pd1, span, arm; 1292 u32 arRef, span_row_size; 1293 1294 u64 block = io_info->ldStartBlock; 1295 u32 count = io_info->numBlocks; 1296 1297 span = ((io_info->span_arm & RAID_CTX_SPANARM_SPAN_MASK) 1298 >> RAID_CTX_SPANARM_SPAN_SHIFT); 1299 arm = (io_info->span_arm & RAID_CTX_SPANARM_ARM_MASK); 1300 1301 ld = MR_TargetIdToLdGet(io_info->ldTgtId, drv_map); 1302 raid = MR_LdRaidGet(ld, drv_map); 1303 span_row_size = instance->UnevenSpanSupport ? 1304 SPAN_ROW_SIZE(drv_map, ld, span) : raid->rowSize; 1305 1306 arRef = MR_LdSpanArrayGet(ld, span, drv_map); 1307 pd0 = MR_ArPdGet(arRef, arm, drv_map); 1308 pd1 = MR_ArPdGet(arRef, (arm + 1) >= span_row_size ? 1309 (arm + 1 - span_row_size) : arm + 1, drv_map); 1310 1311 /* Get PD1 Dev Handle */ 1312 1313 pd1_dev_handle = MR_PdDevHandleGet(pd1, drv_map); 1314 1315 if (pd1_dev_handle == MR_DEVHANDLE_INVALID) { 1316 bestArm = arm; 1317 } else { 1318 /* get the pending cmds for the data and mirror arms */ 1319 pend0 = atomic_read(&lbInfo->scsi_pending_cmds[pd0]); 1320 pend1 = atomic_read(&lbInfo->scsi_pending_cmds[pd1]); 1321 1322 /* Determine the disk whose head is nearer to the req. block */ 1323 diff0 = ABS_DIFF(block, lbInfo->last_accessed_block[pd0]); 1324 diff1 = ABS_DIFF(block, lbInfo->last_accessed_block[pd1]); 1325 bestArm = (diff0 <= diff1 ? arm : arm ^ 1); 1326 1327 /* Make balance count from 16 to 4 to 1328 * keep driver in sync with Firmware 1329 */ 1330 if ((bestArm == arm && pend0 > pend1 + lb_pending_cmds) || 1331 (bestArm != arm && pend1 > pend0 + lb_pending_cmds)) 1332 bestArm ^= 1; 1333 1334 /* Update the last accessed block on the correct pd */ 1335 io_info->span_arm = 1336 (span << RAID_CTX_SPANARM_SPAN_SHIFT) | bestArm; 1337 io_info->pd_after_lb = (bestArm == arm) ? pd0 : pd1; 1338 } 1339 1340 lbInfo->last_accessed_block[io_info->pd_after_lb] = block + count - 1; 1341 return io_info->pd_after_lb; 1342 } 1343 1344 __le16 get_updated_dev_handle(struct megasas_instance *instance, 1345 struct LD_LOAD_BALANCE_INFO *lbInfo, 1346 struct IO_REQUEST_INFO *io_info, 1347 struct MR_DRV_RAID_MAP_ALL *drv_map) 1348 { 1349 u8 arm_pd; 1350 __le16 devHandle; 1351 1352 /* get best new arm (PD ID) */ 1353 arm_pd = megasas_get_best_arm_pd(instance, lbInfo, io_info, drv_map); 1354 devHandle = MR_PdDevHandleGet(arm_pd, drv_map); 1355 io_info->pd_interface = MR_PdInterfaceTypeGet(arm_pd, drv_map); 1356 atomic_inc(&lbInfo->scsi_pending_cmds[arm_pd]); 1357 1358 return devHandle; 1359 } 1360