516 lines
14 KiB
C
516 lines
14 KiB
C
/*
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* Linux MegaRAID driver for SAS based RAID controllers
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*
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* Copyright (c) 2009-2011 LSI Corporation.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* FILE: megaraid_sas_fp.c
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*
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* Authors: LSI Corporation
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* Sumant Patro
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* Varad Talamacki
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* Manoj Jose
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*
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* Send feedback to: <megaraidlinux@lsi.com>
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*
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* Mail to: LSI Corporation, 1621 Barber Lane, Milpitas, CA 95035
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* ATTN: Linuxraid
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*/
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/pci.h>
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#include <linux/list.h>
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#include <linux/moduleparam.h>
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#include <linux/module.h>
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#include <linux/spinlock.h>
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#include <linux/interrupt.h>
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#include <linux/delay.h>
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#include <linux/uio.h>
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#include <linux/uaccess.h>
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#include <linux/fs.h>
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#include <linux/compat.h>
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#include <linux/blkdev.h>
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#include <linux/poll.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_host.h>
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#include "megaraid_sas_fusion.h"
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#include <asm/div64.h>
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#define ABS_DIFF(a, b) (((a) > (b)) ? ((a) - (b)) : ((b) - (a)))
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#define MR_LD_STATE_OPTIMAL 3
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#define FALSE 0
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#define TRUE 1
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/* Prototypes */
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void
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mr_update_load_balance_params(struct MR_FW_RAID_MAP_ALL *map,
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struct LD_LOAD_BALANCE_INFO *lbInfo);
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u32 mega_mod64(u64 dividend, u32 divisor)
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{
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u64 d;
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u32 remainder;
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if (!divisor)
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printk(KERN_ERR "megasas : DIVISOR is zero, in div fn\n");
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d = dividend;
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remainder = do_div(d, divisor);
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return remainder;
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}
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/**
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* @param dividend : Dividend
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* @param divisor : Divisor
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*
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* @return quotient
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**/
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u64 mega_div64_32(uint64_t dividend, uint32_t divisor)
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{
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u32 remainder;
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u64 d;
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if (!divisor)
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printk(KERN_ERR "megasas : DIVISOR is zero in mod fn\n");
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d = dividend;
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remainder = do_div(d, divisor);
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return d;
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}
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struct MR_LD_RAID *MR_LdRaidGet(u32 ld, struct MR_FW_RAID_MAP_ALL *map)
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{
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return &map->raidMap.ldSpanMap[ld].ldRaid;
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}
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static struct MR_SPAN_BLOCK_INFO *MR_LdSpanInfoGet(u32 ld,
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struct MR_FW_RAID_MAP_ALL
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*map)
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{
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return &map->raidMap.ldSpanMap[ld].spanBlock[0];
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}
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static u8 MR_LdDataArmGet(u32 ld, u32 armIdx, struct MR_FW_RAID_MAP_ALL *map)
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{
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return map->raidMap.ldSpanMap[ld].dataArmMap[armIdx];
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}
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static u16 MR_ArPdGet(u32 ar, u32 arm, struct MR_FW_RAID_MAP_ALL *map)
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{
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return map->raidMap.arMapInfo[ar].pd[arm];
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}
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static u16 MR_LdSpanArrayGet(u32 ld, u32 span, struct MR_FW_RAID_MAP_ALL *map)
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{
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return map->raidMap.ldSpanMap[ld].spanBlock[span].span.arrayRef;
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}
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static u16 MR_PdDevHandleGet(u32 pd, struct MR_FW_RAID_MAP_ALL *map)
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{
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return map->raidMap.devHndlInfo[pd].curDevHdl;
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}
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u16 MR_GetLDTgtId(u32 ld, struct MR_FW_RAID_MAP_ALL *map)
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{
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return map->raidMap.ldSpanMap[ld].ldRaid.targetId;
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}
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u16 MR_TargetIdToLdGet(u32 ldTgtId, struct MR_FW_RAID_MAP_ALL *map)
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{
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return map->raidMap.ldTgtIdToLd[ldTgtId];
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}
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static struct MR_LD_SPAN *MR_LdSpanPtrGet(u32 ld, u32 span,
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struct MR_FW_RAID_MAP_ALL *map)
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{
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return &map->raidMap.ldSpanMap[ld].spanBlock[span].span;
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}
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/*
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* This function will validate Map info data provided by FW
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*/
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u8 MR_ValidateMapInfo(struct MR_FW_RAID_MAP_ALL *map,
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struct LD_LOAD_BALANCE_INFO *lbInfo)
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{
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struct MR_FW_RAID_MAP *pFwRaidMap = &map->raidMap;
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if (pFwRaidMap->totalSize !=
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(sizeof(struct MR_FW_RAID_MAP) -sizeof(struct MR_LD_SPAN_MAP) +
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(sizeof(struct MR_LD_SPAN_MAP) *pFwRaidMap->ldCount))) {
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printk(KERN_ERR "megasas: map info structure size 0x%x is not matching with ld count\n",
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(unsigned int)((sizeof(struct MR_FW_RAID_MAP) -
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sizeof(struct MR_LD_SPAN_MAP)) +
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(sizeof(struct MR_LD_SPAN_MAP) *
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pFwRaidMap->ldCount)));
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printk(KERN_ERR "megasas: span map %x, pFwRaidMap->totalSize "
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": %x\n", (unsigned int)sizeof(struct MR_LD_SPAN_MAP),
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pFwRaidMap->totalSize);
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return 0;
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}
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mr_update_load_balance_params(map, lbInfo);
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return 1;
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}
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u32 MR_GetSpanBlock(u32 ld, u64 row, u64 *span_blk,
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struct MR_FW_RAID_MAP_ALL *map, int *div_error)
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{
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struct MR_SPAN_BLOCK_INFO *pSpanBlock = MR_LdSpanInfoGet(ld, map);
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struct MR_QUAD_ELEMENT *quad;
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struct MR_LD_RAID *raid = MR_LdRaidGet(ld, map);
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u32 span, j;
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for (span = 0; span < raid->spanDepth; span++, pSpanBlock++) {
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for (j = 0; j < pSpanBlock->block_span_info.noElements; j++) {
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quad = &pSpanBlock->block_span_info.quad[j];
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if (quad->diff == 0) {
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*div_error = 1;
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return span;
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}
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if (quad->logStart <= row && row <= quad->logEnd &&
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(mega_mod64(row-quad->logStart, quad->diff)) == 0) {
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if (span_blk != NULL) {
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u64 blk, debugBlk;
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blk =
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mega_div64_32(
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(row-quad->logStart),
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quad->diff);
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debugBlk = blk;
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blk = (blk + quad->offsetInSpan) <<
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raid->stripeShift;
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*span_blk = blk;
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}
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return span;
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}
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}
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}
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return span;
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}
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/*
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******************************************************************************
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*
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* This routine calculates the arm, span and block for the specified stripe and
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* reference in stripe.
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*
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* Inputs :
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*
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* ld - Logical drive number
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* stripRow - Stripe number
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* stripRef - Reference in stripe
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*
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* Outputs :
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*
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* span - Span number
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* block - Absolute Block number in the physical disk
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*/
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u8 MR_GetPhyParams(u32 ld, u64 stripRow, u16 stripRef, u64 *pdBlock,
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u16 *pDevHandle, struct RAID_CONTEXT *pRAID_Context,
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struct MR_FW_RAID_MAP_ALL *map)
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{
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struct MR_LD_RAID *raid = MR_LdRaidGet(ld, map);
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u32 pd, arRef;
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u8 physArm, span;
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u64 row;
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u8 retval = TRUE;
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int error_code = 0;
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row = mega_div64_32(stripRow, raid->rowDataSize);
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if (raid->level == 6) {
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/* logical arm within row */
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u32 logArm = mega_mod64(stripRow, raid->rowDataSize);
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u32 rowMod, armQ, arm;
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if (raid->rowSize == 0)
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return FALSE;
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/* get logical row mod */
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rowMod = mega_mod64(row, raid->rowSize);
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armQ = raid->rowSize-1-rowMod; /* index of Q drive */
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arm = armQ+1+logArm; /* data always logically follows Q */
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if (arm >= raid->rowSize) /* handle wrap condition */
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arm -= raid->rowSize;
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physArm = (u8)arm;
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} else {
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if (raid->modFactor == 0)
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return FALSE;
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physArm = MR_LdDataArmGet(ld, mega_mod64(stripRow,
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raid->modFactor),
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map);
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}
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if (raid->spanDepth == 1) {
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span = 0;
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*pdBlock = row << raid->stripeShift;
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} else {
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span = (u8)MR_GetSpanBlock(ld, row, pdBlock, map, &error_code);
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if (error_code == 1)
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return FALSE;
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}
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/* Get the array on which this span is present */
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arRef = MR_LdSpanArrayGet(ld, span, map);
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pd = MR_ArPdGet(arRef, physArm, map); /* Get the pd */
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if (pd != MR_PD_INVALID)
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/* Get dev handle from Pd. */
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*pDevHandle = MR_PdDevHandleGet(pd, map);
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else {
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*pDevHandle = MR_PD_INVALID; /* set dev handle as invalid. */
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if (raid->level >= 5)
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pRAID_Context->regLockFlags = REGION_TYPE_EXCLUSIVE;
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else if (raid->level == 1) {
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/* Get alternate Pd. */
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pd = MR_ArPdGet(arRef, physArm + 1, map);
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if (pd != MR_PD_INVALID)
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/* Get dev handle from Pd */
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*pDevHandle = MR_PdDevHandleGet(pd, map);
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}
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retval = FALSE;
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}
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*pdBlock += stripRef + MR_LdSpanPtrGet(ld, span, map)->startBlk;
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pRAID_Context->spanArm = (span << RAID_CTX_SPANARM_SPAN_SHIFT) |
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physArm;
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return retval;
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}
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/*
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******************************************************************************
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*
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* MR_BuildRaidContext function
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*
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* This function will initiate command processing. The start/end row and strip
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* information is calculated then the lock is acquired.
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* This function will return 0 if region lock was acquired OR return num strips
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*/
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u8
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MR_BuildRaidContext(struct IO_REQUEST_INFO *io_info,
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struct RAID_CONTEXT *pRAID_Context,
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struct MR_FW_RAID_MAP_ALL *map)
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{
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struct MR_LD_RAID *raid;
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u32 ld, stripSize, stripe_mask;
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u64 endLba, endStrip, endRow, start_row, start_strip;
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u64 regStart;
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u32 regSize;
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u8 num_strips, numRows;
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u16 ref_in_start_stripe, ref_in_end_stripe;
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u64 ldStartBlock;
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u32 numBlocks, ldTgtId;
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u8 isRead;
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u8 retval = 0;
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ldStartBlock = io_info->ldStartBlock;
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numBlocks = io_info->numBlocks;
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ldTgtId = io_info->ldTgtId;
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isRead = io_info->isRead;
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ld = MR_TargetIdToLdGet(ldTgtId, map);
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raid = MR_LdRaidGet(ld, map);
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stripSize = 1 << raid->stripeShift;
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stripe_mask = stripSize-1;
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/*
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* calculate starting row and stripe, and number of strips and rows
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*/
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start_strip = ldStartBlock >> raid->stripeShift;
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ref_in_start_stripe = (u16)(ldStartBlock & stripe_mask);
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endLba = ldStartBlock + numBlocks - 1;
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ref_in_end_stripe = (u16)(endLba & stripe_mask);
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endStrip = endLba >> raid->stripeShift;
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num_strips = (u8)(endStrip - start_strip + 1); /* End strip */
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if (raid->rowDataSize == 0)
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return FALSE;
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start_row = mega_div64_32(start_strip, raid->rowDataSize);
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endRow = mega_div64_32(endStrip, raid->rowDataSize);
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numRows = (u8)(endRow - start_row + 1);
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/*
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* calculate region info.
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*/
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/* assume region is at the start of the first row */
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regStart = start_row << raid->stripeShift;
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/* assume this IO needs the full row - we'll adjust if not true */
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regSize = stripSize;
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/* If IO spans more than 1 strip, fp is not possible
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FP is not possible for writes on non-0 raid levels
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FP is not possible if LD is not capable */
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if (num_strips > 1 || (!isRead && raid->level != 0) ||
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!raid->capability.fpCapable) {
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io_info->fpOkForIo = FALSE;
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} else {
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io_info->fpOkForIo = TRUE;
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}
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if (numRows == 1) {
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/* single-strip IOs can always lock only the data needed */
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if (num_strips == 1) {
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regStart += ref_in_start_stripe;
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regSize = numBlocks;
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}
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/* multi-strip IOs always need to full stripe locked */
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} else {
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if (start_strip == (start_row + 1) * raid->rowDataSize - 1) {
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/* If the start strip is the last in the start row */
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regStart += ref_in_start_stripe;
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regSize = stripSize - ref_in_start_stripe;
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/* initialize count to sectors from startref to end
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of strip */
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}
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if (numRows > 2)
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/* Add complete rows in the middle of the transfer */
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regSize += (numRows-2) << raid->stripeShift;
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/* if IO ends within first strip of last row */
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if (endStrip == endRow*raid->rowDataSize)
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regSize += ref_in_end_stripe+1;
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else
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regSize += stripSize;
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}
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pRAID_Context->timeoutValue = map->raidMap.fpPdIoTimeoutSec;
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pRAID_Context->regLockFlags = (isRead) ? REGION_TYPE_SHARED_READ :
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raid->regTypeReqOnWrite;
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pRAID_Context->VirtualDiskTgtId = raid->targetId;
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pRAID_Context->regLockRowLBA = regStart;
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pRAID_Context->regLockLength = regSize;
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pRAID_Context->configSeqNum = raid->seqNum;
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/*Get Phy Params only if FP capable, or else leave it to MR firmware
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to do the calculation.*/
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if (io_info->fpOkForIo) {
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retval = MR_GetPhyParams(ld, start_strip, ref_in_start_stripe,
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&io_info->pdBlock,
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&io_info->devHandle, pRAID_Context,
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map);
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/* If IO on an invalid Pd, then FP i snot possible */
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if (io_info->devHandle == MR_PD_INVALID)
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io_info->fpOkForIo = FALSE;
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return retval;
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} else if (isRead) {
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uint stripIdx;
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for (stripIdx = 0; stripIdx < num_strips; stripIdx++) {
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if (!MR_GetPhyParams(ld, start_strip + stripIdx,
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ref_in_start_stripe,
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&io_info->pdBlock,
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&io_info->devHandle,
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pRAID_Context, map))
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return TRUE;
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}
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}
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return TRUE;
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}
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void
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mr_update_load_balance_params(struct MR_FW_RAID_MAP_ALL *map,
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struct LD_LOAD_BALANCE_INFO *lbInfo)
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{
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int ldCount;
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u16 ld;
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struct MR_LD_RAID *raid;
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for (ldCount = 0; ldCount < MAX_LOGICAL_DRIVES; ldCount++) {
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ld = MR_TargetIdToLdGet(ldCount, map);
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if (ld >= MAX_LOGICAL_DRIVES) {
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lbInfo[ldCount].loadBalanceFlag = 0;
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continue;
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}
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raid = MR_LdRaidGet(ld, map);
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/* Two drive Optimal RAID 1 */
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if ((raid->level == 1) && (raid->rowSize == 2) &&
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(raid->spanDepth == 1) && raid->ldState ==
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MR_LD_STATE_OPTIMAL) {
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u32 pd, arRef;
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lbInfo[ldCount].loadBalanceFlag = 1;
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/* Get the array on which this span is present */
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arRef = MR_LdSpanArrayGet(ld, 0, map);
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/* Get the Pd */
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pd = MR_ArPdGet(arRef, 0, map);
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/* Get dev handle from Pd */
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lbInfo[ldCount].raid1DevHandle[0] =
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MR_PdDevHandleGet(pd, map);
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/* Get the Pd */
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pd = MR_ArPdGet(arRef, 1, map);
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/* Get the dev handle from Pd */
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lbInfo[ldCount].raid1DevHandle[1] =
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MR_PdDevHandleGet(pd, map);
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} else
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lbInfo[ldCount].loadBalanceFlag = 0;
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}
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}
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u8 megasas_get_best_arm(struct LD_LOAD_BALANCE_INFO *lbInfo, u8 arm, u64 block,
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u32 count)
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{
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u16 pend0, pend1;
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u64 diff0, diff1;
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u8 bestArm;
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/* get the pending cmds for the data and mirror arms */
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pend0 = atomic_read(&lbInfo->scsi_pending_cmds[0]);
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pend1 = atomic_read(&lbInfo->scsi_pending_cmds[1]);
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/* Determine the disk whose head is nearer to the req. block */
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diff0 = ABS_DIFF(block, lbInfo->last_accessed_block[0]);
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diff1 = ABS_DIFF(block, lbInfo->last_accessed_block[1]);
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bestArm = (diff0 <= diff1 ? 0 : 1);
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if ((bestArm == arm && pend0 > pend1 + 16) ||
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(bestArm != arm && pend1 > pend0 + 16))
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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(struct LD_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;
|
|
}
|