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