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linux/drivers/scsi/megaraid/megaraid_sas_fp.c
Dan Carpenter fec3c1b457 [SCSI] megaraid_sas: fix a bug for 64 bit arches 
On 64 bit then -1UL and -1U are not equal, so these conditions don't
work as intended and it breaks error handling.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Sumit Saxena <sumit.saxena@lsi.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
2013-07-09 12:14:06 +01:00

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/*
* 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: <megaraidlinux@lsi.com>
*
* Mail to: LSI Corporation, 1621 Barber Lane, Milpitas, CA 95035
* ATTN: Linuxraid
*/
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/list.h>
#include <linux/moduleparam.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/uio.h>
#include <linux/uaccess.h>
#include <linux/fs.h>
#include <linux/compat.h>
#include <linux/blkdev.h>
#include <linux/poll.h>
#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
#include "megaraid_sas_fusion.h"
#include "megaraid_sas.h"
#include <asm/div64.h>
#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_DEBUG 0
#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(struct MR_FW_RAID_MAP_ALL *map,
struct LD_LOAD_BALANCE_INFO *lbInfo);
static void mr_update_span_set(struct 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,
struct RAID_CONTEXT *pRAID_Context, struct MR_FW_RAID_MAP_ALL *map);
static u64 get_row_from_strip(struct megasas_instance *instance, u32 ld,
u64 strip, struct 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);
return d;
}
struct MR_LD_RAID *MR_LdRaidGet(u32 ld, struct MR_FW_RAID_MAP_ALL *map)
{
return &map->raidMap.ldSpanMap[ld].ldRaid;
}
static struct MR_SPAN_BLOCK_INFO *MR_LdSpanInfoGet(u32 ld,
struct MR_FW_RAID_MAP_ALL
*map)
{
return &map->raidMap.ldSpanMap[ld].spanBlock[0];
}
static u8 MR_LdDataArmGet(u32 ld, u32 armIdx, struct MR_FW_RAID_MAP_ALL *map)
{
return map->raidMap.ldSpanMap[ld].dataArmMap[armIdx];
}
static u16 MR_ArPdGet(u32 ar, u32 arm, struct MR_FW_RAID_MAP_ALL *map)
{
return map->raidMap.arMapInfo[ar].pd[arm];
}
static u16 MR_LdSpanArrayGet(u32 ld, u32 span, struct MR_FW_RAID_MAP_ALL *map)
{
return map->raidMap.ldSpanMap[ld].spanBlock[span].span.arrayRef;
}
static u16 MR_PdDevHandleGet(u32 pd, struct MR_FW_RAID_MAP_ALL *map)
{
return map->raidMap.devHndlInfo[pd].curDevHdl;
}
u16 MR_GetLDTgtId(u32 ld, struct MR_FW_RAID_MAP_ALL *map)
{
return map->raidMap.ldSpanMap[ld].ldRaid.targetId;
}
u16 MR_TargetIdToLdGet(u32 ldTgtId, struct MR_FW_RAID_MAP_ALL *map)
{
return map->raidMap.ldTgtIdToLd[ldTgtId];
}
static struct MR_LD_SPAN *MR_LdSpanPtrGet(u32 ld, u32 span,
struct 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;
struct MR_FW_RAID_MAP_ALL *map = fusion->ld_map[(instance->map_id & 1)];
struct LD_LOAD_BALANCE_INFO *lbInfo = fusion->load_balance_info;
PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span;
struct MR_FW_RAID_MAP *pFwRaidMap = &map->raidMap;
if (pFwRaidMap->totalSize !=
(sizeof(struct MR_FW_RAID_MAP) -sizeof(struct MR_LD_SPAN_MAP) +
(sizeof(struct MR_LD_SPAN_MAP) *pFwRaidMap->ldCount))) {
printk(KERN_ERR "megasas: map info structure size 0x%x is not matching with ld count\n",
(unsigned int)((sizeof(struct MR_FW_RAID_MAP) -
sizeof(struct MR_LD_SPAN_MAP)) +
(sizeof(struct MR_LD_SPAN_MAP) *
pFwRaidMap->ldCount)));
printk(KERN_ERR "megasas: span map %x, pFwRaidMap->totalSize "
": %x\n", (unsigned int)sizeof(struct 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,
struct MR_FW_RAID_MAP_ALL *map)
{
struct MR_SPAN_BLOCK_INFO *pSpanBlock = MR_LdSpanInfoGet(ld, map);
struct MR_QUAD_ELEMENT *quad;
struct MR_LD_RAID *raid = MR_LdRaidGet(ld, map);
u32 span, j;
for (span = 0; span < raid->spanDepth; span++, pSpanBlock++) {
for (j = 0; j < pSpanBlock->block_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
*/
#if SPAN_DEBUG
static int getSpanInfo(struct MR_FW_RAID_MAP_ALL *map, PLD_SPAN_INFO ldSpanInfo)
{
u8 span;
u32 element;
struct MR_LD_RAID *raid;
LD_SPAN_SET *span_set;
struct 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);
dev_dbg(&instance->pdev->dev, "LD %x: span_depth=%x\n",
ld, raid->spanDepth);
for (span = 0; span < raid->spanDepth; span++)
dev_dbg(&instance->pdev->dev, "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;
dev_dbg(&instance->pdev->dev, "Span Set %x:"
"width=%x, diff=%x\n", element,
(unsigned int)span_set->span_row_data_width,
(unsigned int)span_set->diff);
dev_dbg(&instance->pdev->dev, "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);
dev_dbg(&instance->pdev->dev, "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);
dev_dbg(&instance->pdev->dev, "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);
dev_dbg(&instance->pdev->dev, "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; span < raid->spanDepth; 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];
dev_dbg(&instance->pdev->dev, "Span=%x,"
"Quad=%x, diff=%x\n", span,
element, quad->diff);
dev_dbg(&instance->pdev->dev,
"offset_in_span=0x%08lx\n",
(long unsigned int)quad->offsetInSpan);
dev_dbg(&instance->pdev->dev,
"logical start=0x%08lx, end=0x%08lx\n",
(long unsigned int)quad->logStart,
(long unsigned int)quad->logEnd);
}
}
}
}
return 0;
}
#endif
/*
******************************************************************************
*
* 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
* div_error - Devide error code.
*/
u32 mr_spanset_get_span_block(struct megasas_instance *instance,
u32 ld, u64 row, u64 *span_blk, struct MR_FW_RAID_MAP_ALL *map)
{
struct fusion_context *fusion = instance->ctrl_context;
struct MR_LD_RAID *raid = MR_LdRaidGet(ld, map);
LD_SPAN_SET *span_set;
struct 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; span < raid->spanDepth; 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, struct MR_FW_RAID_MAP_ALL *map)
{
struct fusion_context *fusion = instance->ctrl_context;
struct 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, retval;
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; span < raid->spanDepth; 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
dev_info(&instance->pdev->dev, "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);
dev_info(&instance->pdev->dev, "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
retval = (span_set->data_row_start + span_set_Row +
(span_offset - 1));
return retval;
}
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, struct MR_FW_RAID_MAP_ALL *map)
{
struct fusion_context *fusion = instance->ctrl_context;
struct MR_LD_RAID *raid = MR_LdRaidGet(ld, map);
LD_SPAN_SET *span_set;
struct MR_QUAD_ELEMENT *quad;
PLD_SPAN_INFO ldSpanInfo = fusion->log_to_span;
u32 span, info;
u64 strip;
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; span < raid->spanDepth; 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;
}
}
}
dev_err(&instance->pdev->dev, "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, struct MR_FW_RAID_MAP_ALL *map)
{
struct fusion_context *fusion = instance->ctrl_context;
struct 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, retval;
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;
strip_offset = (uint)mega_mod64
((strip - span_set->data_strip_start),
span_set->span_row_data_width);
for (span = 0, span_offset = 0; span < raid->spanDepth; 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
dev_info(&instance->pdev->dev, "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
retval = (strip_offset - span_offset);
return retval;
}
dev_err(&instance->pdev->dev, "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,
struct MR_FW_RAID_MAP_ALL *map)
{
struct MR_LD_RAID *raid = MR_LdRaidGet(ld, map);
/* Need to check correct default value */
u32 arm = 0;
switch (raid->level) {
case 0:
case 5:
case 6:
arm = mega_mod64(stripe, SPAN_ROW_SIZE(map, ld, span));
break;
case 1:
/* start with logical arm */
arm = get_arm_from_strip(instance, ld, stripe, map);
if (arm != -1U)
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,
struct RAID_CONTEXT *pRAID_Context,
struct MR_FW_RAID_MAP_ALL *map)
{
struct 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;
if ((instance->pdev->device == PCI_DEVICE_ID_LSI_INVADER ||
instance->pdev->device == PCI_DEVICE_ID_LSI_FURY))
do_invader = 1;
/*Get row and span from io_info for Uneven Span IO.*/
row = io_info->start_row;
span = io_info->start_span;
if (raid->level == 6) {
logArm = get_arm_from_strip(instance, ld, stripRow, map);
if (logArm == -1U)
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 == 0xFF)
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,
struct RAID_CONTEXT *pRAID_Context,
struct MR_FW_RAID_MAP_ALL *map)
{
struct 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) {
/* logical arm within row */
u32 logArm = mega_mod64(stripRow, raid->rowDataSize);
u32 rowMod, armQ, arm;
if (raid->rowSize == 0)
return FALSE;
/* get logical row mod */
rowMod = mega_mod64(row, raid->rowSize);
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;
}
/* Get the array on which this span is present */
arRef = MR_LdSpanArrayGet(ld, span, map);
pd = MR_ArPdGet(arRef, physArm, map); /* Get the pd */
if (pd != MR_PD_INVALID)
/* Get dev handle from Pd. */
*pDevHandle = MR_PdDevHandleGet(pd, map);
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) {
/* Get alternate Pd. */
pd = MR_ArPdGet(arRef, physArm + 1, map);
if (pd != MR_PD_INVALID)
/* Get dev handle from Pd */
*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;
}
/*
******************************************************************************
*
* 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,
struct RAID_CONTEXT *pRAID_Context,
struct MR_FW_RAID_MAP_ALL *map)
{
struct MR_LD_RAID *raid;
u32 ld, stripSize, stripe_mask;
u64 endLba, endStrip, endRow, start_row, start_strip;
u64 regStart;
u32 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 {
dev_info(&instance->pdev->dev,
"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) {
dev_info(&instance->pdev->dev, "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) {
dev_info(&instance->pdev->dev, "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
dev_dbg(&instance->pdev->dev, "Check Span number from %s %d"
"for row 0x%llx, start strip 0x%llx end strip 0x%llx"
" span 0x%x\n", __func__, __LINE__,
(unsigned long long)start_row,
(unsigned long long)start_strip,
(unsigned long long)endStrip, startlba_span);
dev_dbg(&instance->pdev->dev, "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);
endRow = mega_div64_32(endStrip, raid->rowDataSize);
}
numRows = (u8)(endRow - start_row + 1);
/*
* calculate region info.
*/
/* assume region is at the start of the first row */
regStart = start_row << raid->stripeShift;
/* assume this IO needs the full row - we'll adjust if not true */
regSize = stripSize;
/* 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) {
/* single-strip IOs can always lock only the data needed */
if (num_strips == 1) {
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)
/* Add complete rows in the middle of the transfer*/
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; stripIdx < num_strips; stripIdx++) {
retval = io_info->IoforUnevenSpan ?
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(struct MR_FW_RAID_MAP_ALL *map,
PLD_SPAN_INFO ldSpanInfo)
{
u8 span, count;
u32 element, span_row_width;
u64 span_row;
struct MR_LD_RAID *raid;
LD_SPAN_SET *span_set, *span_set_prev;
struct 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;
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;
count < raid->spanDepth; 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(KERN_INFO "megasas:"
"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;
}
}
#if SPAN_DEBUG
getSpanInfo(map, ldSpanInfo);
#endif
}
void
mr_update_load_balance_params(struct MR_FW_RAID_MAP_ALL *map,
struct LD_LOAD_BALANCE_INFO *lbInfo)
{
int ldCount;
u16 ld;
struct 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;
/* Get the array on which this span is present */
arRef = MR_LdSpanArrayGet(ld, 0, map);
/* Get the Pd */
pd = MR_ArPdGet(arRef, 0, map);
/* Get dev handle from Pd */
lbInfo[ldCount].raid1DevHandle[0] =
MR_PdDevHandleGet(pd, map);
/* Get the Pd */
pd = MR_ArPdGet(arRef, 1, map);
/* Get the dev handle from Pd */
lbInfo[ldCount].raid1DevHandle[1] =
MR_PdDevHandleGet(pd, map);
} else
lbInfo[ldCount].loadBalanceFlag = 0;
}
}
u8 megasas_get_best_arm(struct LD_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);
/*Make balance count from 16 to 4 to keep driver in sync with Firmware*/
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(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;
}
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