/* * Linux MegaRAID driver for SAS based RAID controllers * * Copyright (c) 2009-2012 LSI Corporation. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * * FILE: megaraid_sas_fp.c * * Authors: LSI Corporation * Sumant Patro * Varad Talamacki * Manoj Jose * * Send feedback to: * * Mail to: LSI Corporation, 1621 Barber Lane, Milpitas, CA 95035 * ATTN: Linuxraid */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "megaraid_sas_fusion.h" #include "megaraid_sas.h" #include #define SPAN_DEBUG 0 #define ABS_DIFF(a,b) ( ((a) > (b)) ? ((a) - (b)) : ((b) - (a)) ) #define MR_LD_STATE_OPTIMAL 3 #define FALSE 0 #define TRUE 1 #define SPAN_ROW_SIZE(map, ld, index_) MR_LdSpanPtrGet(ld, index_, map)->spanRowSize #define SPAN_ROW_DATA_SIZE(map_, ld, index_) MR_LdSpanPtrGet(ld, index_, map)->spanRowDataSize #define SPAN_INVALID 0xff /* Prototypes */ void mr_update_load_balance_params(MR_FW_RAID_MAP_ALL *map, PLD_LOAD_BALANCE_INFO lbInfo); void mr_update_span_set(MR_FW_RAID_MAP_ALL *map, PLD_SPAN_INFO ldSpanInfo); static u8 mr_spanset_get_phy_params(struct megasas_instance *instance, u32 ld, u64 stripRow, u16 stripRef, struct IO_REQUEST_INFO *io_info, RAID_CONTEXT *pRAID_Context, MR_FW_RAID_MAP_ALL *map); static u64 get_row_from_strip(struct megasas_instance *instance, u32 ld, u64 strip, MR_FW_RAID_MAP_ALL *map); u32 mega_mod64(u64 dividend, u32 divisor) { u64 d; u32 remainder; if (!divisor) printk(KERN_ERR "megasas : DIVISOR is zero, in div fn\n"); d = dividend; remainder = do_div(d, divisor); return remainder; } /** * @param dividend : Dividend * @param divisor : Divisor * * @return quotient **/ u64 mega_div64_32(uint64_t dividend, uint32_t divisor) { u32 remainder; u64 d; if (!divisor) printk(KERN_ERR "megasas : DIVISOR is zero in mod fn\n"); d = dividend; remainder = do_div(d, divisor); /* Stores the quotient in d and returns the remainder */ return d; } MR_LD_RAID *MR_LdRaidGet(u32 ld, MR_FW_RAID_MAP_ALL *map) { return &map->raidMap.ldSpanMap[ld].ldRaid; } static MR_SPAN_BLOCK_INFO *MR_LdSpanInfoGet(u32 ld, MR_FW_RAID_MAP_ALL *map) { return &map->raidMap.ldSpanMap[ld].spanBlock[0]; } static u8 MR_LdDataArmGet(u32 ld, u32 armIdx, MR_FW_RAID_MAP_ALL *map) { return map->raidMap.ldSpanMap[ld].dataArmMap[armIdx]; } static u16 MR_ArPdGet(u32 ar, u32 arm, MR_FW_RAID_MAP_ALL *map) { return map->raidMap.arMapInfo[ar].pd[arm]; } static u16 MR_LdSpanArrayGet(u32 ld, u32 span, MR_FW_RAID_MAP_ALL *map) { return map->raidMap.ldSpanMap[ld].spanBlock[span].span.arrayRef; } static u16 MR_PdDevHandleGet(u32 pd, MR_FW_RAID_MAP_ALL *map) { return map->raidMap.devHndlInfo[pd].curDevHdl; } u16 MR_GetLDTgtId(u32 ld, MR_FW_RAID_MAP_ALL *map) { return map->raidMap.ldSpanMap[ld].ldRaid.targetId; } u16 MR_TargetIdToLdGet(u32 ldTgtId, MR_FW_RAID_MAP_ALL *map) { return map->raidMap.ldTgtIdToLd[ldTgtId]; } static MR_LD_SPAN *MR_LdSpanPtrGet(u32 ld, u32 span, MR_FW_RAID_MAP_ALL *map) { return &map->raidMap.ldSpanMap[ld].spanBlock[span].span; } /* * This function will validate Map info data provided by FW */ u8 MR_ValidateMapInfo(struct megasas_instance *instance) { struct fusion_context *fusion = instance->ctrl_context; MR_FW_RAID_MAP_ALL *map = fusion->ld_map[(instance->map_id & 1)]; PLD_LOAD_BALANCE_INFO lbInfo = fusion->load_balance_info; PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span; MR_FW_RAID_MAP *pFwRaidMap = &map->raidMap; if (pFwRaidMap->totalSize != (sizeof (MR_FW_RAID_MAP) - sizeof(MR_LD_SPAN_MAP) + (sizeof(MR_LD_SPAN_MAP) * pFwRaidMap->ldCount))) { printk(KERN_ERR "megasas: map info structure size 0x%lx is not matching with ld count\n", ((sizeof (MR_FW_RAID_MAP) - sizeof(MR_LD_SPAN_MAP)) + (sizeof(MR_LD_SPAN_MAP) * pFwRaidMap->ldCount))); printk(KERN_ERR "megasas: span map %lx, pFwRaidMap->totalSize : %x\n",sizeof(MR_LD_SPAN_MAP), pFwRaidMap->totalSize); return 0; } if (instance->UnevenSpanSupport) mr_update_span_set(map, ldSpanInfo); mr_update_load_balance_params(map, lbInfo); return 1; } u32 MR_GetSpanBlock(u32 ld, u64 row, u64 *span_blk, MR_FW_RAID_MAP_ALL *map) { MR_SPAN_BLOCK_INFO *pSpanBlock = MR_LdSpanInfoGet(ld, map); MR_QUAD_ELEMENT *quad; MR_LD_RAID *raid = MR_LdRaidGet(ld, map); u32 span, j; for (span=0; spanspanDepth; span++, pSpanBlock++) { for (j=0; jblock_span_info.noElements; j++) { quad = &pSpanBlock->block_span_info.quad[j]; if (quad->diff == 0) return SPAN_INVALID; if (quad->logStart <= row && row <= quad->logEnd && ( mega_mod64(row-quad->logStart, quad->diff)) == 0) { if (span_blk != NULL) { u64 blk, debugBlk; blk = mega_div64_32((row-quad->logStart), quad->diff); debugBlk = blk; blk = (blk + quad->offsetInSpan) << raid->stripeShift; *span_blk = blk; } return span; } } } return SPAN_INVALID; } /* ****************************************************************************** * * Function to print info about span set created in driver from FW raid map * * Inputs : * map - LD map * ldSpanInfo - ldSpanInfo per HBA instance */ static int getSpanInfo(MR_FW_RAID_MAP_ALL *map, PLD_SPAN_INFO ldSpanInfo) { u8 span; u32 element; MR_LD_RAID *raid; LD_SPAN_SET *span_set; MR_QUAD_ELEMENT *quad; int ldCount; u16 ld; for (ldCount = 0; ldCount < MAX_LOGICAL_DRIVES; ldCount++) { ld = MR_TargetIdToLdGet(ldCount, map); if (ld >= MAX_LOGICAL_DRIVES) { continue; } raid = MR_LdRaidGet(ld, map); printk("LD %x: span_depth=%x\n", ld, raid->spanDepth); for (span=0; spanspanDepth; span++) printk("Span=%x, number of quads=%x\n", span, map->raidMap.ldSpanMap[ld].spanBlock[span]. block_span_info.noElements); for (element=0; element < MAX_QUAD_DEPTH; element++) { span_set = &(ldSpanInfo[ld].span_set[element]); if (span_set->span_row_data_width == 0) break; printk(" Span Set %x: width=%x, diff=%x\n", element, (unsigned int)span_set->span_row_data_width, (unsigned int)span_set->diff); printk(" logical LBA start=0x%08lx, end=0x%08lx\n", (long unsigned int)span_set->log_start_lba, (long unsigned int)span_set->log_end_lba); printk(" span row start=0x%08lx, end=0x%08lx\n", (long unsigned int)span_set->span_row_start, (long unsigned int)span_set->span_row_end); printk(" data row start=0x%08lx, end=0x%08lx\n", (long unsigned int)span_set->data_row_start, (long unsigned int)span_set->data_row_end); printk(" data strip start=0x%08lx, end=0x%08lx\n", (long unsigned int)span_set->data_strip_start, (long unsigned int)span_set->data_strip_end); for (span=0; spanspanDepth; span++) { if (map->raidMap.ldSpanMap[ld].spanBlock[span]. block_span_info.noElements >=element+1){ quad = &map->raidMap.ldSpanMap[ld]. spanBlock[span].block_span_info. quad[element]; printk(" Span=%x, Quad=%x, diff=%x\n", span, element, quad->diff); printk(" offset_in_span=0x%08lx\n", (long unsigned int)quad->offsetInSpan); printk(" logical start=0x%08lx, end=0x%08lx\n", (long unsigned int)quad->logStart, (long unsigned int)quad->logEnd); } } } } return 0; } /* ****************************************************************************** * * This routine calculates the Span block for given row using spanset. * * Inputs : * instance - HBA instance * ld - Logical drive number * row - Row number * map - LD map * * Outputs : * * span - Span number * block - Absolute Block number in the physical disk */ u32 mr_spanset_get_span_block(struct megasas_instance *instance, u32 ld, u64 row, u64 *span_blk, MR_FW_RAID_MAP_ALL *map) { struct fusion_context *fusion = instance->ctrl_context; MR_LD_RAID *raid = MR_LdRaidGet(ld, map); LD_SPAN_SET *span_set; MR_QUAD_ELEMENT *quad; u32 span, info; PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span; for (info=0; info < MAX_QUAD_DEPTH; info++) { span_set = &(ldSpanInfo[ld].span_set[info]); if (span_set->span_row_data_width == 0) break; if (row > span_set->data_row_end) continue; for (span=0; spanspanDepth; span++) if (map->raidMap.ldSpanMap[ld].spanBlock[span]. block_span_info.noElements >= info+1) { quad = &map->raidMap.ldSpanMap[ld]. spanBlock[span]. block_span_info.quad[info]; if (quad->diff == 0) return SPAN_INVALID; if ( quad->logStart <= row && row <= quad->logEnd && (mega_mod64(row - quad->logStart, quad->diff)) == 0 ) { if (span_blk != NULL) { u64 blk; blk = mega_div64_32 ((row - quad->logStart), quad->diff); blk = (blk + quad->offsetInSpan) << raid->stripeShift; *span_blk = blk; } return span; } } } return SPAN_INVALID; } /* ****************************************************************************** * * This routine calculates the row for given strip using spanset. * * Inputs : * instance - HBA instance * ld - Logical drive number * Strip - Strip * map - LD map * * Outputs : * * row - row associated with strip */ static u64 get_row_from_strip(struct megasas_instance *instance, u32 ld, u64 strip, MR_FW_RAID_MAP_ALL *map) { struct fusion_context *fusion = instance->ctrl_context; MR_LD_RAID *raid = MR_LdRaidGet(ld, map); LD_SPAN_SET *span_set; PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span; u32 info, strip_offset, span, span_offset; u64 span_set_Strip, span_set_Row; for (info=0; info < MAX_QUAD_DEPTH; info++) { span_set = &(ldSpanInfo[ld].span_set[info]); if (span_set->span_row_data_width == 0) break; if (strip > span_set->data_strip_end) continue; span_set_Strip = strip - span_set->data_strip_start; strip_offset = mega_mod64(span_set_Strip, span_set->span_row_data_width); span_set_Row = mega_div64_32(span_set_Strip, span_set->span_row_data_width) * span_set->diff; for (span=0,span_offset=0; spanspanDepth; span++) if (map->raidMap.ldSpanMap[ld].spanBlock[span]. block_span_info.noElements >=info+1) { if (strip_offset >= span_set->strip_offset[span]) span_offset++; else break; } #if SPAN_DEBUG printk("LSI Debug : Strip 0x%llx, span_set_Strip 0x%llx, span_set_Row 0x%llx " "data width 0x%llx span offset 0x%x\n", strip, (unsigned long long)span_set_Strip, (unsigned long long)span_set_Row, (unsigned long long)span_set->span_row_data_width, span_offset); printk("LSI Debug : For strip 0x%llx row is 0x%llx\n", strip, (unsigned long long) span_set->data_row_start + (unsigned long long) span_set_Row + (span_offset - 1)); #endif return (span_set->data_row_start + span_set_Row + (span_offset - 1)); } return -1LLU; } /* ****************************************************************************** * * This routine calculates the Start Strip for given row using spanset. * * Inputs : * instance - HBA instance * ld - Logical drive number * row - Row number * map - LD map * * Outputs : * * Strip - Start strip associated with row */ static u64 get_strip_from_row(struct megasas_instance *instance, u32 ld, u64 row, MR_FW_RAID_MAP_ALL *map) { struct fusion_context *fusion = instance->ctrl_context; MR_LD_RAID *raid = MR_LdRaidGet(ld, map); LD_SPAN_SET *span_set; MR_QUAD_ELEMENT *quad; PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span; u32 span, info; u64 strip; for (info=0; infospan_row_data_width == 0) break; if (row > span_set->data_row_end) continue; for (span=0; spanspanDepth; span++) if (map->raidMap.ldSpanMap[ld].spanBlock[span]. block_span_info.noElements >=info+1) { quad = &map->raidMap.ldSpanMap[ld]. spanBlock[span].block_span_info.quad[info]; if ( quad->logStart <= row && row <= quad->logEnd && mega_mod64((row - quad->logStart), quad->diff) == 0 ) { strip = mega_div64_32 (((row - span_set->data_row_start) - quad->logStart), quad->diff); strip *= span_set->span_row_data_width; strip += span_set->data_strip_start; strip += span_set->strip_offset[span]; return strip; } } } printk("LSI Debug - get_strip_from_row: returns invalid " "strip for ld=%x, row=%lx\n", ld, (long unsigned int)row); return -1; } /* ****************************************************************************** * * This routine calculates the Physical Arm for given strip using spanset. * * Inputs : * instance - HBA instance * ld - Logical drive number * strip - Strip * map - LD map * * Outputs : * * Phys Arm - Phys Arm associated with strip */ static u32 get_arm_from_strip(struct megasas_instance *instance, u32 ld, u64 strip, MR_FW_RAID_MAP_ALL *map) { struct fusion_context *fusion = instance->ctrl_context; MR_LD_RAID *raid = MR_LdRaidGet(ld, map); LD_SPAN_SET *span_set; PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span; u32 info, strip_offset, span, span_offset; for (info=0; infospan_row_data_width == 0) break; if (strip > span_set->data_strip_end) continue; strip_offset = (uint)mega_mod64 ((strip - span_set->data_strip_start), span_set->span_row_data_width); for (span=0,span_offset=0; spanspanDepth; span++) if (map->raidMap.ldSpanMap[ld].spanBlock[span]. block_span_info.noElements >=info+1) { if (strip_offset >= span_set->strip_offset[span]) span_offset = span_set->strip_offset[span]; else break; } #if SPAN_DEBUG printk("LSI PRL11: get_arm_from_strip: " " for ld=0x%x strip=0x%lx arm is 0x%x\n", ld, (long unsigned int)strip, (strip_offset - span_offset)); #endif return (strip_offset - span_offset); } printk("LSI Debug: - get_arm_from_strip: returns invalid arm" " for ld=%x strip=%lx\n", ld, (long unsigned int)strip); return -1; } /* This Function will return Phys arm */ u8 get_arm(struct megasas_instance *instance, u32 ld, u8 span, u64 stripe, MR_FW_RAID_MAP_ALL *map) { MR_LD_RAID *raid = MR_LdRaidGet(ld, map); /* Need to check correct default value */ u32 arm = 0; switch (raid->level) { case 1: // start with logical arm arm = get_arm_from_strip(instance, ld, stripe, map); if (arm != (u32) -1) arm *= 2; break; } return arm; } /* ****************************************************************************** * * This routine calculates the arm, span and block for the specified stripe and * reference in stripe using spanset * * Inputs : * * ld - Logical drive number * stripRow - Stripe number * stripRef - Reference in stripe * * Outputs : * * span - Span number * block - Absolute Block number in the physical disk */ static u8 mr_spanset_get_phy_params(struct megasas_instance *instance, u32 ld, u64 stripRow, u16 stripRef, struct IO_REQUEST_INFO *io_info, RAID_CONTEXT *pRAID_Context, MR_FW_RAID_MAP_ALL *map) { MR_LD_RAID *raid = MR_LdRaidGet(ld, map); u32 pd, arRef; u8 physArm, span; u64 row; u8 retval = TRUE; u8 do_invader = 0; u64 *pdBlock = &io_info->pdBlock; u16 *pDevHandle = &io_info->devHandle; u32 logArm, rowMod, armQ, arm; // Get row and span from io_info for Uneven Span IO. row = io_info->start_row; span = io_info->start_span; if (instance->pdev->device == PCI_DEVICE_ID_LSI_INVADER || instance->pdev->device == PCI_DEVICE_ID_LSI_FURY) do_invader = 1; if (raid->level == 6) { logArm = get_arm_from_strip(instance, ld, stripRow, map); if (logArm == (u32)-1) return FALSE; rowMod = mega_mod64(row, SPAN_ROW_SIZE(map, ld, span)); armQ = SPAN_ROW_SIZE(map,ld,span) - 1 - rowMod; arm = armQ + 1 + logArm; if (arm >= SPAN_ROW_SIZE(map, ld, span)) arm -= SPAN_ROW_SIZE(map ,ld ,span); physArm = (u8)arm; } else // Calculate the arm physArm = get_arm(instance, ld, span, stripRow, map); if (physArm == (u8)-1) return FALSE; arRef = MR_LdSpanArrayGet(ld, span, map); pd = MR_ArPdGet(arRef, physArm, map); if (pd != MR_PD_INVALID) *pDevHandle = MR_PdDevHandleGet(pd, map); else { *pDevHandle = MR_PD_INVALID; if ((raid->level >= 5) && (!do_invader || (do_invader && (raid->regTypeReqOnRead != REGION_TYPE_UNUSED)))) pRAID_Context->regLockFlags = REGION_TYPE_EXCLUSIVE; else if (raid->level == 1) { pd = MR_ArPdGet(arRef, physArm + 1, map); if (pd != MR_PD_INVALID) *pDevHandle = MR_PdDevHandleGet(pd, map); } } *pdBlock += stripRef + MR_LdSpanPtrGet(ld, span, map)->startBlk; pRAID_Context->spanArm = (span << RAID_CTX_SPANARM_SPAN_SHIFT) | physArm; return retval; } /* ****************************************************************************** * * This routine calculates the arm, span and block for the specified stripe and * reference in stripe. * * Inputs : * * ld - Logical drive number * stripRow - Stripe number * stripRef - Reference in stripe * * Outputs : * * span - Span number * block - Absolute Block number in the physical disk */ u8 MR_GetPhyParams(struct megasas_instance *instance,u32 ld, u64 stripRow, u16 stripRef, struct IO_REQUEST_INFO *io_info, RAID_CONTEXT *pRAID_Context, MR_FW_RAID_MAP_ALL *map) { MR_LD_RAID *raid = MR_LdRaidGet(ld, map); u32 pd, arRef; u8 physArm, span; u64 row; u8 retval = TRUE; u8 do_invader = 0; u64 *pdBlock = &io_info->pdBlock; u16 *pDevHandle = &io_info->devHandle; if (instance->pdev->device == PCI_DEVICE_ID_LSI_INVADER || instance->pdev->device == PCI_DEVICE_ID_LSI_FURY) do_invader = 1; row = mega_div64_32(stripRow, raid->rowDataSize); if (raid->level == 6) { u32 logArm = mega_mod64(stripRow, raid->rowDataSize); // logical arm within row u32 rowMod, armQ, arm; if (raid->rowSize == 0) return FALSE; rowMod = mega_mod64(row, raid->rowSize); // get logical row mod armQ = raid->rowSize-1-rowMod; // index of Q drive arm = armQ+1+logArm; // data always logically follows Q if (arm >= raid->rowSize) // handle wrap condition arm -= raid->rowSize; physArm = (u8)arm; } else { if (raid->modFactor == 0) return FALSE; physArm = MR_LdDataArmGet(ld, mega_mod64(stripRow, raid->modFactor), map); } if (raid->spanDepth == 1) { span = 0; *pdBlock = row << raid->stripeShift; } else { span = (u8)MR_GetSpanBlock(ld, row, pdBlock, map); if (span == SPAN_INVALID) return FALSE; } arRef = MR_LdSpanArrayGet(ld, span, map); // Get the array on which this span is present. pd = MR_ArPdGet(arRef, physArm, map); // Get the Pd. if (pd != MR_PD_INVALID) *pDevHandle = MR_PdDevHandleGet(pd, map); // Get dev handle from Pd. else { *pDevHandle = MR_PD_INVALID; // set dev handle as invalid. if ((raid->level >= 5) && (!do_invader || ( do_invader && (raid->regTypeReqOnRead != REGION_TYPE_UNUSED)))) pRAID_Context->regLockFlags = REGION_TYPE_EXCLUSIVE; else if (raid->level == 1) { pd = MR_ArPdGet(arRef, physArm + 1, map); // Get Alternate Pd. if (pd != MR_PD_INVALID) *pDevHandle = MR_PdDevHandleGet(pd, map); // Get dev handle from Pd. } } *pdBlock += stripRef + MR_LdSpanPtrGet(ld, span, map)->startBlk; pRAID_Context->spanArm = (span << RAID_CTX_SPANARM_SPAN_SHIFT) | physArm; return retval; } typedef u64 REGION_KEY; typedef u32 REGION_LEN; /* ****************************************************************************** * * MR_BuildRaidContext function * * This function will initiate command processing. The start/end row and strip * information is calculated then the lock is acquired. * This function will return 0 if region lock was acquired OR return num strips ??? */ u8 MR_BuildRaidContext(struct megasas_instance *instance, struct IO_REQUEST_INFO *io_info, RAID_CONTEXT *pRAID_Context, MR_FW_RAID_MAP_ALL *map) { MR_LD_RAID *raid; u32 ld, stripSize, stripe_mask; u64 endLba, endStrip, endRow, start_row, start_strip; REGION_KEY regStart; REGION_LEN regSize; u8 num_strips, numRows; u16 ref_in_start_stripe, ref_in_end_stripe; u64 ldStartBlock; u32 numBlocks, ldTgtId; u8 isRead; u8 retval = 0; u8 startlba_span = SPAN_INVALID; u64 *pdBlock = &io_info->pdBlock; ldStartBlock = io_info->ldStartBlock; numBlocks = io_info->numBlocks; ldTgtId = io_info->ldTgtId; isRead = io_info->isRead; io_info->IoforUnevenSpan = 0; io_info->start_span = SPAN_INVALID; ld = MR_TargetIdToLdGet(ldTgtId, map); raid = MR_LdRaidGet(ld, map); /* if rowDataSize @RAID map and spanRowDataSize @SPAN INFO are zero * return FALSE */ if (raid->rowDataSize == 0) { if (MR_LdSpanPtrGet(ld, 0, map)->spanRowDataSize == 0) return FALSE; else if (instance->UnevenSpanSupport) { io_info->IoforUnevenSpan = 1; } else { printk("LSI Debug: raid->rowDataSize is 0, but has SPAN[0] rowDataSize = 0x%0x," " but there is _NO_ UnevenSpanSupport\n", MR_LdSpanPtrGet(ld, 0, map)->spanRowDataSize); return FALSE; } } stripSize = 1 << raid->stripeShift; stripe_mask = stripSize-1; /* * calculate starting row and stripe, and number of strips and rows */ start_strip = ldStartBlock >> raid->stripeShift; ref_in_start_stripe = (u16)(ldStartBlock & stripe_mask); endLba = ldStartBlock + numBlocks - 1; ref_in_end_stripe = (u16)(endLba & stripe_mask); endStrip = endLba >> raid->stripeShift; num_strips = (u8)(endStrip - start_strip + 1); // End strip if (io_info->IoforUnevenSpan) { start_row = get_row_from_strip(instance, ld, start_strip, map); endRow = get_row_from_strip(instance, ld, endStrip, map); if (start_row == -1ULL || endRow == -1ULL) { printk("LSI Debug: return from %s %d. Send IO w/o region lock.\n", __func__, __LINE__); return FALSE; } if (raid->spanDepth == 1) { startlba_span = 0; *pdBlock = start_row << raid->stripeShift; } else startlba_span = (u8)mr_spanset_get_span_block(instance, ld, start_row, pdBlock, map); if (startlba_span == SPAN_INVALID) { printk("LSI Debug: return from %s %d for row 0x%llx," "start strip %llx endSrip %llx\n", __func__, __LINE__, (unsigned long long)start_row, (unsigned long long)start_strip, (unsigned long long)endStrip); return FALSE; } io_info->start_span = startlba_span; io_info->start_row = start_row; #if SPAN_DEBUG printk("LSI Debug: Check Span number from %s %d for row 0x%llx, " " start strip 0x%llx endSrip 0x%llx span 0x%x\n", __func__, __LINE__, (unsigned long long)start_row, (unsigned long long)start_strip, (unsigned long long)endStrip, startlba_span); printk("LSI Debug : 1. start_row 0x%llx endRow 0x%llx Start span 0x%x\n", (unsigned long long)start_row, (unsigned long long)endRow, startlba_span); #endif } else { start_row = mega_div64_32(start_strip, raid->rowDataSize); // Start Row endRow = mega_div64_32(endStrip, raid->rowDataSize); } numRows = (u8)(endRow - start_row + 1); // get the row count /* * calculate region info. */ regStart = start_row << raid->stripeShift; // assume region is at the start of the first row regSize = stripSize; // assume this IO needs the full row - we'll adjust if not true /* Check if we can send this I/O via FastPath */ if (raid->capability.fpCapable) { if (isRead) io_info->fpOkForIo = (raid->capability.fpReadCapable && ((num_strips == 1) || raid->capability. fpReadAcrossStripe)); else io_info->fpOkForIo = (raid->capability.fpWriteCapable && ((num_strips == 1) || raid->capability. fpWriteAcrossStripe)); } else io_info->fpOkForIo = FALSE; if (numRows == 1) { if (num_strips == 1) { // single-strip IOs can always lock only the data needed regStart += ref_in_start_stripe; regSize = numBlocks; } // multi-strip IOs always need to full stripe locked } else if (io_info->IoforUnevenSpan == 0){ // For Even span region lock optimization. // If the start strip is the last in the start row if (start_strip == (start_row + 1) * raid->rowDataSize - 1) { regStart += ref_in_start_stripe; // initialize count to sectors from startRef to end of strip regSize = stripSize - ref_in_start_stripe; } // add complete rows in the middle of the transfer if (numRows > 2) regSize += (numRows-2) << raid->stripeShift; // if IO ends within first strip of last row if (endStrip == endRow*raid->rowDataSize) regSize += ref_in_end_stripe+1; else regSize += stripSize; } else { //For Uneven span region lock optimization. // If the start strip is the last in the start row if (start_strip == (get_strip_from_row(instance, ld, start_row, map) + SPAN_ROW_DATA_SIZE(map, ld, startlba_span) - 1)) { regStart += ref_in_start_stripe; // initialize count to sectors from startRef to end of strip regSize = stripSize - ref_in_start_stripe; } // add complete rows in the middle of the transfer if (numRows > 2) regSize += (numRows-2) << raid->stripeShift; // if IO ends within first strip of last row if (endStrip == get_strip_from_row(instance, ld, endRow, map)) regSize += ref_in_end_stripe+1; else regSize += stripSize; } pRAID_Context->timeoutValue = map->raidMap.fpPdIoTimeoutSec; if ( (instance->pdev->device == PCI_DEVICE_ID_LSI_INVADER) || (instance->pdev->device == PCI_DEVICE_ID_LSI_FURY) ) pRAID_Context->regLockFlags = (isRead)? raid->regTypeReqOnRead : raid->regTypeReqOnWrite; else pRAID_Context->regLockFlags = (isRead)? REGION_TYPE_SHARED_READ : raid->regTypeReqOnWrite; pRAID_Context->VirtualDiskTgtId = raid->targetId; pRAID_Context->regLockRowLBA = regStart; pRAID_Context->regLockLength = regSize; pRAID_Context->configSeqNum = raid->seqNum; /*Get Phy Params only if FP capable, or else leave it to MR firmware * to do the calculation. */ if (io_info->fpOkForIo) { retval = io_info->IoforUnevenSpan ? mr_spanset_get_phy_params(instance, ld, start_strip, ref_in_start_stripe, io_info, pRAID_Context, map) : MR_GetPhyParams(instance, ld, start_strip, ref_in_start_stripe, io_info, pRAID_Context, map); // If IO on an invalid Pd, then FP is not possible. if (io_info->devHandle == MR_PD_INVALID) io_info->fpOkForIo = FALSE; return retval; } else if (isRead) { uint stripIdx; for (stripIdx=0; stripIdxIoforUnevenSpan ? mr_spanset_get_phy_params(instance, ld, start_strip + stripIdx, ref_in_start_stripe, io_info, pRAID_Context, map) : MR_GetPhyParams(instance, ld, start_strip + stripIdx, ref_in_start_stripe, io_info, pRAID_Context, map); if (!retval) return TRUE; } } #if SPAN_DEBUG // Just for testing what arm we get for strip. if( io_info->IoforUnevenSpan) get_arm_from_strip(instance, ld, start_strip, map); #endif return TRUE; } /* ****************************************************************************** * * This routine pepare spanset info from Valid Raid map and store it into * local copy of ldSpanInfo per instance data structure. * * Inputs : * map - LD map * ldSpanInfo - ldSpanInfo per HBA instance * */ void mr_update_span_set(MR_FW_RAID_MAP_ALL *map, PLD_SPAN_INFO ldSpanInfo) { u8 span,count; u32 element,span_row_width; u64 span_row; MR_LD_RAID *raid; LD_SPAN_SET *span_set, *span_set_prev; MR_QUAD_ELEMENT *quad; int ldCount; u16 ld; for (ldCount = 0; ldCount < MAX_LOGICAL_DRIVES; ldCount++) { ld = MR_TargetIdToLdGet(ldCount, map); if (ld >= MAX_LOGICAL_DRIVES) continue; raid = MR_LdRaidGet(ld, map); for (element=0; element < MAX_QUAD_DEPTH; element++) { for (span=0; span < raid->spanDepth; span++) { if (map->raidMap.ldSpanMap[ld].spanBlock[span]. block_span_info.noElements < element+1) continue; // TO-DO span_set = &(ldSpanInfo[ld].span_set[element]); quad = &map->raidMap.ldSpanMap[ld]. spanBlock[span].block_span_info. quad[element]; span_set->diff = quad->diff; for (count=0,span_row_width=0; countspanDepth; count++) { if (map->raidMap.ldSpanMap[ld]. spanBlock[count]. block_span_info. noElements >=element+1) { span_set->strip_offset[count] = span_row_width; span_row_width += MR_LdSpanPtrGet (ld, count, map)->spanRowDataSize; printk("LSI Debug span %x rowDataSize %x\n", count, MR_LdSpanPtrGet (ld, count, map)->spanRowDataSize); } } span_set->span_row_data_width = span_row_width; span_row = mega_div64_32(((quad->logEnd - quad->logStart) + quad->diff), quad->diff); if (element == 0) { span_set->log_start_lba = 0; span_set->log_end_lba = ((span_row << raid->stripeShift) * span_row_width) - 1; span_set->span_row_start = 0; span_set->span_row_end = span_row - 1; span_set->data_strip_start = 0; span_set->data_strip_end = (span_row * span_row_width) - 1; span_set->data_row_start = 0; span_set->data_row_end = (span_row * quad->diff) - 1; } else { span_set_prev = &(ldSpanInfo[ld]. span_set[element - 1]); span_set->log_start_lba = span_set_prev->log_end_lba + 1; span_set->log_end_lba = span_set->log_start_lba + ((span_row << raid->stripeShift) * span_row_width) - 1; span_set->span_row_start = span_set_prev->span_row_end + 1; span_set->span_row_end = span_set->span_row_start + span_row - 1; span_set->data_strip_start = span_set_prev->data_strip_end + 1; span_set->data_strip_end = span_set->data_strip_start + (span_row * span_row_width) - 1; span_set->data_row_start = span_set_prev->data_row_end + 1; span_set->data_row_end = span_set->data_row_start + (span_row * quad->diff) - 1; } break; } if (span == raid->spanDepth) break; // no quads remain } } getSpanInfo(map, ldSpanInfo); //to get span set info } void mr_update_load_balance_params(MR_FW_RAID_MAP_ALL *map, PLD_LOAD_BALANCE_INFO lbInfo) { int ldCount; u16 ld; MR_LD_RAID *raid; for (ldCount = 0; ldCount < MAX_LOGICAL_DRIVES; ldCount++) { ld = MR_TargetIdToLdGet(ldCount, map); if (ld >= MAX_LOGICAL_DRIVES) { lbInfo[ldCount].loadBalanceFlag = 0; continue; } raid = MR_LdRaidGet(ld, map); /* Two drive Optimal RAID 1 */ if ((raid->level == 1) && (raid->rowSize == 2) && (raid->spanDepth == 1) && raid->ldState == MR_LD_STATE_OPTIMAL) { u32 pd, arRef; lbInfo[ldCount].loadBalanceFlag = 1; arRef = MR_LdSpanArrayGet(ld, 0, map); // Get the array on which this span is present. pd = MR_ArPdGet(arRef, 0, map); // Get the Pd. lbInfo[ldCount].raid1DevHandle[0] = MR_PdDevHandleGet(pd, map); // Get dev handle from Pd. pd = MR_ArPdGet(arRef, 1, map); // Get the Pd. lbInfo[ldCount].raid1DevHandle[1] = MR_PdDevHandleGet(pd, map); // Get dev handle from Pd. } else lbInfo[ldCount].loadBalanceFlag = 0; } } u8 megasas_get_best_arm(PLD_LOAD_BALANCE_INFO lbInfo, u8 arm, u64 block, u32 count) { u16 pend0, pend1; u64 diff0, diff1; u8 bestArm; /* get the pending cmds for the data and mirror arms */ pend0 = atomic_read(&lbInfo->scsi_pending_cmds[0]); pend1 = atomic_read(&lbInfo->scsi_pending_cmds[1]); /* Determine the disk whose head is nearer to the req. block */ diff0 = ABS_DIFF(block, lbInfo->last_accessed_block[0]); diff1 = ABS_DIFF(block, lbInfo->last_accessed_block[1]); bestArm = (diff0 <= diff1 ? 0 : 1); //Load balance count is changed from 16 to 4 to keep it in sync with FW if ((bestArm == arm && pend0 > pend1 + 4) || (bestArm != arm && pend1 > pend0 + 4)) bestArm ^= 1; /* Update the last accessed block on the correct pd */ lbInfo->last_accessed_block[bestArm] = block + count - 1; return bestArm; } u16 get_updated_dev_handle(PLD_LOAD_BALANCE_INFO lbInfo, struct IO_REQUEST_INFO *io_info) { u8 arm, old_arm; u16 devHandle; old_arm = lbInfo->raid1DevHandle[0] == io_info->devHandle ? 0 : 1; /* get best new arm */ arm = megasas_get_best_arm(lbInfo, old_arm, io_info->ldStartBlock, io_info->numBlocks); devHandle = lbInfo->raid1DevHandle[arm]; atomic_inc(&lbInfo->scsi_pending_cmds[arm]); return devHandle; }