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linux/drivers/scsi/megaraid/megaraid_sas_fp.c
Damien Le Moal 97eec79f6c scsi: megaraid: Remove set but unused variable 
The variable remainder is unused in mega_div64_32(). Remove it to avoid a
compiler warning. While at it, also fix the function documentation
comments.

Link: https://lore.kernel.org/r/20200706123348.451871-1-damien.lemoal@wdc.com
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2020-07-08 01:02:11 -04:00

1422 lines
42 KiB
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Linux MegaRAID driver for SAS based RAID controllers
*
* Copyright (c) 2009-2013 LSI Corporation
* Copyright (c) 2013-2016 Avago Technologies
* Copyright (c) 2016-2018 Broadcom Inc.
*
* FILE: megaraid_sas_fp.c
*
* Authors: Broadcom Inc.
* Sumant Patro
* Varad Talamacki
* Manoj Jose
* Kashyap Desai <kashyap.desai@broadcom.com>
* Sumit Saxena <sumit.saxena@broadcom.com>
*
* Send feedback to: megaraidlinux.pdl@broadcom.com
*/
#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 <linux/irq_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 LB_PENDING_CMDS_DEFAULT 4
static unsigned int lb_pending_cmds = LB_PENDING_CMDS_DEFAULT;
module_param(lb_pending_cmds, int, 0444);
MODULE_PARM_DESC(lb_pending_cmds, "Change raid-1 load balancing outstanding "
"threshold. Valid Values are 1-128. Default: 4");
#define ABS_DIFF(a, b) (((a) > (b)) ? ((a) - (b)) : ((b) - (a)))
#define MR_LD_STATE_OPTIMAL 3
#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 */
static void mr_update_span_set(struct MR_DRV_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_DRV_RAID_MAP_ALL *map);
static u64 get_row_from_strip(struct megasas_instance *instance, u32 ld,
u64 strip, struct MR_DRV_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;
}
/**
* mega_div64_32 - Do a 64-bit division
* @dividend: Dividend
* @divisor: Divisor
*
* @return quotient
**/
static u64 mega_div64_32(uint64_t dividend, uint32_t divisor)
{
u64 d = dividend;
if (!divisor)
printk(KERN_ERR "megasas : DIVISOR is zero in mod fn\n");
do_div(d, divisor);
return d;
}
struct MR_LD_RAID *MR_LdRaidGet(u32 ld, struct MR_DRV_RAID_MAP_ALL *map)
{
return &map->raidMap.ldSpanMap[ld].ldRaid;
}
static struct MR_SPAN_BLOCK_INFO *MR_LdSpanInfoGet(u32 ld,
struct MR_DRV_RAID_MAP_ALL
*map)
{
return &map->raidMap.ldSpanMap[ld].spanBlock[0];
}
static u8 MR_LdDataArmGet(u32 ld, u32 armIdx, struct MR_DRV_RAID_MAP_ALL *map)
{
return map->raidMap.ldSpanMap[ld].dataArmMap[armIdx];
}
u16 MR_ArPdGet(u32 ar, u32 arm, struct MR_DRV_RAID_MAP_ALL *map)
{
return le16_to_cpu(map->raidMap.arMapInfo[ar].pd[arm]);
}
u16 MR_LdSpanArrayGet(u32 ld, u32 span, struct MR_DRV_RAID_MAP_ALL *map)
{
return le16_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].span.arrayRef);
}
__le16 MR_PdDevHandleGet(u32 pd, struct MR_DRV_RAID_MAP_ALL *map)
{
return map->raidMap.devHndlInfo[pd].curDevHdl;
}
static u8 MR_PdInterfaceTypeGet(u32 pd, struct MR_DRV_RAID_MAP_ALL *map)
{
return map->raidMap.devHndlInfo[pd].interfaceType;
}
u16 MR_GetLDTgtId(u32 ld, struct MR_DRV_RAID_MAP_ALL *map)
{
return le16_to_cpu(map->raidMap.ldSpanMap[ld].ldRaid.targetId);
}
u16 MR_TargetIdToLdGet(u32 ldTgtId, struct MR_DRV_RAID_MAP_ALL *map)
{
return map->raidMap.ldTgtIdToLd[ldTgtId];
}
static struct MR_LD_SPAN *MR_LdSpanPtrGet(u32 ld, u32 span,
struct MR_DRV_RAID_MAP_ALL *map)
{
return &map->raidMap.ldSpanMap[ld].spanBlock[span].span;
}
/*
* This function will Populate Driver Map using firmware raid map
*/
static int MR_PopulateDrvRaidMap(struct megasas_instance *instance, u64 map_id)
{
struct fusion_context *fusion = instance->ctrl_context;
struct MR_FW_RAID_MAP_ALL *fw_map_old = NULL;
struct MR_FW_RAID_MAP *pFwRaidMap = NULL;
int i, j;
u16 ld_count;
struct MR_FW_RAID_MAP_DYNAMIC *fw_map_dyn;
struct MR_FW_RAID_MAP_EXT *fw_map_ext;
struct MR_RAID_MAP_DESC_TABLE *desc_table;
struct MR_DRV_RAID_MAP_ALL *drv_map =
fusion->ld_drv_map[(map_id & 1)];
struct MR_DRV_RAID_MAP *pDrvRaidMap = &drv_map->raidMap;
void *raid_map_data = NULL;
memset(drv_map, 0, fusion->drv_map_sz);
memset(pDrvRaidMap->ldTgtIdToLd,
0xff, (sizeof(u16) * MAX_LOGICAL_DRIVES_DYN));
if (instance->max_raid_mapsize) {
fw_map_dyn = fusion->ld_map[(map_id & 1)];
desc_table =
(struct MR_RAID_MAP_DESC_TABLE *)((void *)fw_map_dyn + le32_to_cpu(fw_map_dyn->desc_table_offset));
if (desc_table != fw_map_dyn->raid_map_desc_table)
dev_dbg(&instance->pdev->dev, "offsets of desc table are not matching desc %p original %p\n",
desc_table, fw_map_dyn->raid_map_desc_table);
ld_count = (u16)le16_to_cpu(fw_map_dyn->ld_count);
pDrvRaidMap->ldCount = (__le16)cpu_to_le16(ld_count);
pDrvRaidMap->fpPdIoTimeoutSec =
fw_map_dyn->fp_pd_io_timeout_sec;
pDrvRaidMap->totalSize =
cpu_to_le32(sizeof(struct MR_DRV_RAID_MAP_ALL));
/* point to actual data starting point*/
raid_map_data = (void *)fw_map_dyn +
le32_to_cpu(fw_map_dyn->desc_table_offset) +
le32_to_cpu(fw_map_dyn->desc_table_size);
for (i = 0; i < le32_to_cpu(fw_map_dyn->desc_table_num_elements); ++i) {
switch (le32_to_cpu(desc_table->raid_map_desc_type)) {
case RAID_MAP_DESC_TYPE_DEVHDL_INFO:
fw_map_dyn->dev_hndl_info =
(struct MR_DEV_HANDLE_INFO *)(raid_map_data + le32_to_cpu(desc_table->raid_map_desc_offset));
memcpy(pDrvRaidMap->devHndlInfo,
fw_map_dyn->dev_hndl_info,
sizeof(struct MR_DEV_HANDLE_INFO) *
le32_to_cpu(desc_table->raid_map_desc_elements));
break;
case RAID_MAP_DESC_TYPE_TGTID_INFO:
fw_map_dyn->ld_tgt_id_to_ld =
(u16 *)(raid_map_data +
le32_to_cpu(desc_table->raid_map_desc_offset));
for (j = 0; j < le32_to_cpu(desc_table->raid_map_desc_elements); j++) {
pDrvRaidMap->ldTgtIdToLd[j] =
le16_to_cpu(fw_map_dyn->ld_tgt_id_to_ld[j]);
}
break;
case RAID_MAP_DESC_TYPE_ARRAY_INFO:
fw_map_dyn->ar_map_info =
(struct MR_ARRAY_INFO *)
(raid_map_data + le32_to_cpu(desc_table->raid_map_desc_offset));
memcpy(pDrvRaidMap->arMapInfo,
fw_map_dyn->ar_map_info,
sizeof(struct MR_ARRAY_INFO) *
le32_to_cpu(desc_table->raid_map_desc_elements));
break;
case RAID_MAP_DESC_TYPE_SPAN_INFO:
fw_map_dyn->ld_span_map =
(struct MR_LD_SPAN_MAP *)
(raid_map_data +
le32_to_cpu(desc_table->raid_map_desc_offset));
memcpy(pDrvRaidMap->ldSpanMap,
fw_map_dyn->ld_span_map,
sizeof(struct MR_LD_SPAN_MAP) *
le32_to_cpu(desc_table->raid_map_desc_elements));
break;
default:
dev_dbg(&instance->pdev->dev, "wrong number of desctableElements %d\n",
fw_map_dyn->desc_table_num_elements);
}
++desc_table;
}
} else if (instance->supportmax256vd) {
fw_map_ext =
(struct MR_FW_RAID_MAP_EXT *)fusion->ld_map[(map_id & 1)];
ld_count = (u16)le16_to_cpu(fw_map_ext->ldCount);
if (ld_count > MAX_LOGICAL_DRIVES_EXT) {
dev_dbg(&instance->pdev->dev, "megaraid_sas: LD count exposed in RAID map in not valid\n");
return 1;
}
pDrvRaidMap->ldCount = (__le16)cpu_to_le16(ld_count);
pDrvRaidMap->fpPdIoTimeoutSec = fw_map_ext->fpPdIoTimeoutSec;
for (i = 0; i < (MAX_LOGICAL_DRIVES_EXT); i++)
pDrvRaidMap->ldTgtIdToLd[i] =
(u16)fw_map_ext->ldTgtIdToLd[i];
memcpy(pDrvRaidMap->ldSpanMap, fw_map_ext->ldSpanMap,
sizeof(struct MR_LD_SPAN_MAP) * ld_count);
memcpy(pDrvRaidMap->arMapInfo, fw_map_ext->arMapInfo,
sizeof(struct MR_ARRAY_INFO) * MAX_API_ARRAYS_EXT);
memcpy(pDrvRaidMap->devHndlInfo, fw_map_ext->devHndlInfo,
sizeof(struct MR_DEV_HANDLE_INFO) *
MAX_RAIDMAP_PHYSICAL_DEVICES);
/* New Raid map will not set totalSize, so keep expected value
* for legacy code in ValidateMapInfo
*/
pDrvRaidMap->totalSize =
cpu_to_le32(sizeof(struct MR_FW_RAID_MAP_EXT));
} else {
fw_map_old = (struct MR_FW_RAID_MAP_ALL *)
fusion->ld_map[(map_id & 1)];
pFwRaidMap = &fw_map_old->raidMap;
ld_count = (u16)le32_to_cpu(pFwRaidMap->ldCount);
if (ld_count > MAX_LOGICAL_DRIVES) {
dev_dbg(&instance->pdev->dev,
"LD count exposed in RAID map in not valid\n");
return 1;
}
pDrvRaidMap->totalSize = pFwRaidMap->totalSize;
pDrvRaidMap->ldCount = (__le16)cpu_to_le16(ld_count);
pDrvRaidMap->fpPdIoTimeoutSec = pFwRaidMap->fpPdIoTimeoutSec;
for (i = 0; i < MAX_RAIDMAP_LOGICAL_DRIVES + MAX_RAIDMAP_VIEWS; i++)
pDrvRaidMap->ldTgtIdToLd[i] =
(u8)pFwRaidMap->ldTgtIdToLd[i];
for (i = 0; i < ld_count; i++) {
pDrvRaidMap->ldSpanMap[i] = pFwRaidMap->ldSpanMap[i];
}
memcpy(pDrvRaidMap->arMapInfo, pFwRaidMap->arMapInfo,
sizeof(struct MR_ARRAY_INFO) * MAX_RAIDMAP_ARRAYS);
memcpy(pDrvRaidMap->devHndlInfo, pFwRaidMap->devHndlInfo,
sizeof(struct MR_DEV_HANDLE_INFO) *
MAX_RAIDMAP_PHYSICAL_DEVICES);
}
return 0;
}
/*
* This function will validate Map info data provided by FW
*/
u8 MR_ValidateMapInfo(struct megasas_instance *instance, u64 map_id)
{
struct fusion_context *fusion;
struct MR_DRV_RAID_MAP_ALL *drv_map;
struct MR_DRV_RAID_MAP *pDrvRaidMap;
struct LD_LOAD_BALANCE_INFO *lbInfo;
PLD_SPAN_INFO ldSpanInfo;
struct MR_LD_RAID *raid;
u16 num_lds, i;
u16 ld;
u32 expected_size;
if (MR_PopulateDrvRaidMap(instance, map_id))
return 0;
fusion = instance->ctrl_context;
drv_map = fusion->ld_drv_map[(map_id & 1)];
pDrvRaidMap = &drv_map->raidMap;
lbInfo = fusion->load_balance_info;
ldSpanInfo = fusion->log_to_span;
if (instance->max_raid_mapsize)
expected_size = sizeof(struct MR_DRV_RAID_MAP_ALL);
else if (instance->supportmax256vd)
expected_size = sizeof(struct MR_FW_RAID_MAP_EXT);
else
expected_size =
(sizeof(struct MR_FW_RAID_MAP) - sizeof(struct MR_LD_SPAN_MAP) +
(sizeof(struct MR_LD_SPAN_MAP) * le16_to_cpu(pDrvRaidMap->ldCount)));
if (le32_to_cpu(pDrvRaidMap->totalSize) != expected_size) {
dev_dbg(&instance->pdev->dev, "megasas: map info structure size 0x%x",
le32_to_cpu(pDrvRaidMap->totalSize));
dev_dbg(&instance->pdev->dev, "is not matching expected size 0x%x\n",
(unsigned int)expected_size);
dev_err(&instance->pdev->dev, "megasas: span map %x, pDrvRaidMap->totalSize : %x\n",
(unsigned int)sizeof(struct MR_LD_SPAN_MAP),
le32_to_cpu(pDrvRaidMap->totalSize));
return 0;
}
if (instance->UnevenSpanSupport)
mr_update_span_set(drv_map, ldSpanInfo);
if (lbInfo)
mr_update_load_balance_params(drv_map, lbInfo);
num_lds = le16_to_cpu(drv_map->raidMap.ldCount);
/*Convert Raid capability values to CPU arch */
for (i = 0; (num_lds > 0) && (i < MAX_LOGICAL_DRIVES_EXT); i++) {
ld = MR_TargetIdToLdGet(i, drv_map);
/* For non existing VDs, iterate to next VD*/
if (ld >= (MAX_LOGICAL_DRIVES_EXT - 1))
continue;
raid = MR_LdRaidGet(ld, drv_map);
le32_to_cpus((u32 *)&raid->capability);
num_lds--;
}
return 1;
}
static u32 MR_GetSpanBlock(u32 ld, u64 row, u64 *span_blk,
struct MR_DRV_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 < le32_to_cpu(pSpanBlock->block_span_info.noElements); j++) {
quad = &pSpanBlock->block_span_info.quad[j];
if (le32_to_cpu(quad->diff) == 0)
return SPAN_INVALID;
if (le64_to_cpu(quad->logStart) <= row && row <=
le64_to_cpu(quad->logEnd) && (mega_mod64(row - le64_to_cpu(quad->logStart),
le32_to_cpu(quad->diff))) == 0) {
if (span_blk != NULL) {
u64 blk;
blk = mega_div64_32((row-le64_to_cpu(quad->logStart)), le32_to_cpu(quad->diff));
blk = (blk + le64_to_cpu(quad->offsetInSpan)) << raid->stripeShift;
*span_blk = blk;
}
return span;
}
}
}
return SPAN_INVALID;
}
/*
******************************************************************************
*
* 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.
*/
static u32 mr_spanset_get_span_block(struct megasas_instance *instance,
u32 ld, u64 row, u64 *span_blk, struct MR_DRV_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 (le32_to_cpu(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 (le32_to_cpu(quad->diff) == 0)
return SPAN_INVALID;
if (le64_to_cpu(quad->logStart) <= row &&
row <= le64_to_cpu(quad->logEnd) &&
(mega_mod64(row - le64_to_cpu(quad->logStart),
le32_to_cpu(quad->diff))) == 0) {
if (span_blk != NULL) {
u64 blk;
blk = mega_div64_32
((row - le64_to_cpu(quad->logStart)),
le32_to_cpu(quad->diff));
blk = (blk + le64_to_cpu(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_DRV_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 (le32_to_cpu(map->raidMap.ldSpanMap[ld].spanBlock[span].
block_span_info.noElements) >= info+1) {
if (strip_offset >=
span_set->strip_offset[span])
span_offset++;
else
break;
}
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_DRV_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 (le32_to_cpu(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 (le64_to_cpu(quad->logStart) <= row &&
row <= le64_to_cpu(quad->logEnd) &&
mega_mod64((row - le64_to_cpu(quad->logStart)),
le32_to_cpu(quad->diff)) == 0) {
strip = mega_div64_32
(((row - span_set->data_row_start)
- le64_to_cpu(quad->logStart)),
le32_to_cpu(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_DRV_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 (le32_to_cpu(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;
}
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 */
static u8 get_arm(struct megasas_instance *instance, u32 ld, u8 span, u64 stripe,
struct MR_DRV_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_DRV_RAID_MAP_ALL *map)
{
struct MR_LD_RAID *raid = MR_LdRaidGet(ld, map);
u32 pd, arRef, r1_alt_pd;
u8 physArm, span;
u64 row;
u8 retval = true;
u64 *pdBlock = &io_info->pdBlock;
__le16 *pDevHandle = &io_info->devHandle;
u8 *pPdInterface = &io_info->pd_interface;
u32 logArm, rowMod, armQ, arm;
*pDevHandle = cpu_to_le16(MR_DEVHANDLE_INVALID);
/*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);
*pPdInterface = MR_PdInterfaceTypeGet(pd, map);
/* get second pd also for raid 1/10 fast path writes*/
if ((instance->adapter_type >= VENTURA_SERIES) &&
(raid->level == 1) &&
!io_info->isRead) {
r1_alt_pd = MR_ArPdGet(arRef, physArm + 1, map);
if (r1_alt_pd != MR_PD_INVALID)
io_info->r1_alt_dev_handle =
MR_PdDevHandleGet(r1_alt_pd, map);
}
} else {
if ((raid->level >= 5) &&
((instance->adapter_type == THUNDERBOLT_SERIES) ||
((instance->adapter_type == INVADER_SERIES) &&
(raid->regTypeReqOnRead != REGION_TYPE_UNUSED))))
pRAID_Context->reg_lock_flags = REGION_TYPE_EXCLUSIVE;
else if (raid->level == 1) {
physArm = physArm + 1;
pd = MR_ArPdGet(arRef, physArm, map);
if (pd != MR_PD_INVALID) {
*pDevHandle = MR_PdDevHandleGet(pd, map);
*pPdInterface = MR_PdInterfaceTypeGet(pd, map);
}
}
}
*pdBlock += stripRef + le64_to_cpu(MR_LdSpanPtrGet(ld, span, map)->startBlk);
if (instance->adapter_type >= VENTURA_SERIES) {
((struct RAID_CONTEXT_G35 *)pRAID_Context)->span_arm =
(span << RAID_CTX_SPANARM_SPAN_SHIFT) | physArm;
io_info->span_arm =
(span << RAID_CTX_SPANARM_SPAN_SHIFT) | physArm;
} else {
pRAID_Context->span_arm =
(span << RAID_CTX_SPANARM_SPAN_SHIFT) | physArm;
io_info->span_arm = pRAID_Context->span_arm;
}
io_info->pd_after_lb = pd;
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
*/
static 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_DRV_RAID_MAP_ALL *map)
{
struct MR_LD_RAID *raid = MR_LdRaidGet(ld, map);
u32 pd, arRef, r1_alt_pd;
u8 physArm, span;
u64 row;
u8 retval = true;
u64 *pdBlock = &io_info->pdBlock;
__le16 *pDevHandle = &io_info->devHandle;
u8 *pPdInterface = &io_info->pd_interface;
*pDevHandle = cpu_to_le16(MR_DEVHANDLE_INVALID);
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);
*pPdInterface = MR_PdInterfaceTypeGet(pd, map);
/* get second pd also for raid 1/10 fast path writes*/
if ((instance->adapter_type >= VENTURA_SERIES) &&
(raid->level == 1) &&
!io_info->isRead) {
r1_alt_pd = MR_ArPdGet(arRef, physArm + 1, map);
if (r1_alt_pd != MR_PD_INVALID)
io_info->r1_alt_dev_handle =
MR_PdDevHandleGet(r1_alt_pd, map);
}
} else {
if ((raid->level >= 5) &&
((instance->adapter_type == THUNDERBOLT_SERIES) ||
((instance->adapter_type == INVADER_SERIES) &&
(raid->regTypeReqOnRead != REGION_TYPE_UNUSED))))
pRAID_Context->reg_lock_flags = REGION_TYPE_EXCLUSIVE;
else if (raid->level == 1) {
/* Get alternate Pd. */
physArm = physArm + 1;
pd = MR_ArPdGet(arRef, physArm, map);
if (pd != MR_PD_INVALID) {
/* Get dev handle from Pd */
*pDevHandle = MR_PdDevHandleGet(pd, map);
*pPdInterface = MR_PdInterfaceTypeGet(pd, map);
}
}
}
*pdBlock += stripRef + le64_to_cpu(MR_LdSpanPtrGet(ld, span, map)->startBlk);
if (instance->adapter_type >= VENTURA_SERIES) {
((struct RAID_CONTEXT_G35 *)pRAID_Context)->span_arm =
(span << RAID_CTX_SPANARM_SPAN_SHIFT) | physArm;
io_info->span_arm =
(span << RAID_CTX_SPANARM_SPAN_SHIFT) | physArm;
} else {
pRAID_Context->span_arm =
(span << RAID_CTX_SPANARM_SPAN_SHIFT) | physArm;
io_info->span_arm = pRAID_Context->span_arm;
}
io_info->pd_after_lb = pd;
return retval;
}
/*
* mr_get_phy_params_r56_rmw - Calculate parameters for R56 CTIO write operation
* @instance: Adapter soft state
* @ld: LD index
* @stripNo: Strip Number
* @io_info: IO info structure pointer
* pRAID_Context: RAID context pointer
* map: RAID map pointer
*
* This routine calculates the logical arm, data Arm, row number and parity arm
* for R56 CTIO write operation.
*/
static void mr_get_phy_params_r56_rmw(struct megasas_instance *instance,
u32 ld, u64 stripNo,
struct IO_REQUEST_INFO *io_info,
struct RAID_CONTEXT_G35 *pRAID_Context,
struct MR_DRV_RAID_MAP_ALL *map)
{
struct MR_LD_RAID *raid = MR_LdRaidGet(ld, map);
u8 span, dataArms, arms, dataArm, logArm;
s8 rightmostParityArm, PParityArm;
u64 rowNum;
u64 *pdBlock = &io_info->pdBlock;
dataArms = raid->rowDataSize;
arms = raid->rowSize;
rowNum = mega_div64_32(stripNo, dataArms);
/* parity disk arm, first arm is 0 */
rightmostParityArm = (arms - 1) - mega_mod64(rowNum, arms);
/* logical arm within row */
logArm = mega_mod64(stripNo, dataArms);
/* physical arm for data */
dataArm = mega_mod64((rightmostParityArm + 1 + logArm), arms);
if (raid->spanDepth == 1) {
span = 0;
} else {
span = (u8)MR_GetSpanBlock(ld, rowNum, pdBlock, map);
if (span == SPAN_INVALID)
return;
}
if (raid->level == 6) {
/* P Parity arm, note this can go negative adjust if negative */
PParityArm = (arms - 2) - mega_mod64(rowNum, arms);
if (PParityArm < 0)
PParityArm += arms;
/* rightmostParityArm is P-Parity for RAID 5 and Q-Parity for RAID */
pRAID_Context->flow_specific.r56_arm_map = rightmostParityArm;
pRAID_Context->flow_specific.r56_arm_map |=
(u16)(PParityArm << RAID_CTX_R56_P_ARM_SHIFT);
} else {
pRAID_Context->flow_specific.r56_arm_map |=
(u16)(rightmostParityArm << RAID_CTX_R56_P_ARM_SHIFT);
}
pRAID_Context->reg_lock_row_lba = cpu_to_le64(rowNum);
pRAID_Context->flow_specific.r56_arm_map |=
(u16)(logArm << RAID_CTX_R56_LOG_ARM_SHIFT);
cpu_to_le16s(&pRAID_Context->flow_specific.r56_arm_map);
pRAID_Context->span_arm = (span << RAID_CTX_SPANARM_SPAN_SHIFT) | dataArm;
pRAID_Context->raid_flags = (MR_RAID_FLAGS_IO_SUB_TYPE_R56_DIV_OFFLOAD <<
MR_RAID_CTX_RAID_FLAGS_IO_SUB_TYPE_SHIFT);
return;
}
/*
******************************************************************************
*
* 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_DRV_RAID_MAP_ALL *map, u8 **raidLUN)
{
struct fusion_context *fusion;
struct MR_LD_RAID *raid;
u32 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;
u16 ld;
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;
fusion = instance->ctrl_context;
ld = MR_TargetIdToLdGet(ldTgtId, map);
raid = MR_LdRaidGet(ld, map);
/*check read ahead bit*/
io_info->ra_capable = raid->capability.ra_capable;
/*
* 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;
io_info->data_arms = raid->rowDataSize;
/*
* 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;
} 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;
io_info->do_fp_rlbypass = raid->capability.fpBypassRegionLock;
/* 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->timeout_value =
cpu_to_le16(raid->fpIoTimeoutForLd ?
raid->fpIoTimeoutForLd :
map->raidMap.fpPdIoTimeoutSec);
if (instance->adapter_type == INVADER_SERIES)
pRAID_Context->reg_lock_flags = (isRead) ?
raid->regTypeReqOnRead : raid->regTypeReqOnWrite;
else if (instance->adapter_type == THUNDERBOLT_SERIES)
pRAID_Context->reg_lock_flags = (isRead) ?
REGION_TYPE_SHARED_READ : raid->regTypeReqOnWrite;
pRAID_Context->virtual_disk_tgt_id = raid->targetId;
pRAID_Context->reg_lock_row_lba = cpu_to_le64(regStart);
pRAID_Context->reg_lock_length = cpu_to_le32(regSize);
pRAID_Context->config_seq_num = raid->seqNum;
/* save pointer to raid->LUN array */
*raidLUN = raid->LUN;
/* Aero R5/6 Division Offload for WRITE */
if (fusion->r56_div_offload && (raid->level >= 5) && !isRead) {
mr_get_phy_params_r56_rmw(instance, ld, start_strip, io_info,
(struct RAID_CONTEXT_G35 *)pRAID_Context,
map);
return true;
}
/*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_DEVHANDLE_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;
}
}
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_DRV_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_EXT; ldCount++) {
ld = MR_TargetIdToLdGet(ldCount, map);
if (ld >= (MAX_LOGICAL_DRIVES_EXT - 1))
continue;
raid = MR_LdRaidGet(ld, map);
for (element = 0; element < MAX_QUAD_DEPTH; element++) {
for (span = 0; span < raid->spanDepth; span++) {
if (le32_to_cpu(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 = le32_to_cpu(quad->diff);
for (count = 0, span_row_width = 0;
count < raid->spanDepth; count++) {
if (le32_to_cpu(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;
}
}
span_set->span_row_data_width = span_row_width;
span_row = mega_div64_32(((le64_to_cpu(quad->logEnd) -
le64_to_cpu(quad->logStart)) + le32_to_cpu(quad->diff)),
le32_to_cpu(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 * le32_to_cpu(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 * le32_to_cpu(quad->diff)) - 1;
}
break;
}
if (span == raid->spanDepth)
break;
}
}
}
void mr_update_load_balance_params(struct MR_DRV_RAID_MAP_ALL *drv_map,
struct LD_LOAD_BALANCE_INFO *lbInfo)
{
int ldCount;
u16 ld;
struct MR_LD_RAID *raid;
if (lb_pending_cmds > 128 || lb_pending_cmds < 1)
lb_pending_cmds = LB_PENDING_CMDS_DEFAULT;
for (ldCount = 0; ldCount < MAX_LOGICAL_DRIVES_EXT; ldCount++) {
ld = MR_TargetIdToLdGet(ldCount, drv_map);
if (ld >= MAX_LOGICAL_DRIVES_EXT - 1) {
lbInfo[ldCount].loadBalanceFlag = 0;
continue;
}
raid = MR_LdRaidGet(ld, drv_map);
if ((raid->level != 1) ||
(raid->ldState != MR_LD_STATE_OPTIMAL)) {
lbInfo[ldCount].loadBalanceFlag = 0;
continue;
}
lbInfo[ldCount].loadBalanceFlag = 1;
}
}
static u8 megasas_get_best_arm_pd(struct megasas_instance *instance,
struct LD_LOAD_BALANCE_INFO *lbInfo,
struct IO_REQUEST_INFO *io_info,
struct MR_DRV_RAID_MAP_ALL *drv_map)
{
struct MR_LD_RAID *raid;
u16 pd1_dev_handle;
u16 pend0, pend1, ld;
u64 diff0, diff1;
u8 bestArm, pd0, pd1, span, arm;
u32 arRef, span_row_size;
u64 block = io_info->ldStartBlock;
u32 count = io_info->numBlocks;
span = ((io_info->span_arm & RAID_CTX_SPANARM_SPAN_MASK)
>> RAID_CTX_SPANARM_SPAN_SHIFT);
arm = (io_info->span_arm & RAID_CTX_SPANARM_ARM_MASK);
ld = MR_TargetIdToLdGet(io_info->ldTgtId, drv_map);
raid = MR_LdRaidGet(ld, drv_map);
span_row_size = instance->UnevenSpanSupport ?
SPAN_ROW_SIZE(drv_map, ld, span) : raid->rowSize;
arRef = MR_LdSpanArrayGet(ld, span, drv_map);
pd0 = MR_ArPdGet(arRef, arm, drv_map);
pd1 = MR_ArPdGet(arRef, (arm + 1) >= span_row_size ?
(arm + 1 - span_row_size) : arm + 1, drv_map);
/* Get PD1 Dev Handle */
pd1_dev_handle = MR_PdDevHandleGet(pd1, drv_map);
if (pd1_dev_handle == MR_DEVHANDLE_INVALID) {
bestArm = arm;
} else {
/* get the pending cmds for the data and mirror arms */
pend0 = atomic_read(&lbInfo->scsi_pending_cmds[pd0]);
pend1 = atomic_read(&lbInfo->scsi_pending_cmds[pd1]);
/* Determine the disk whose head is nearer to the req. block */
diff0 = ABS_DIFF(block, lbInfo->last_accessed_block[pd0]);
diff1 = ABS_DIFF(block, lbInfo->last_accessed_block[pd1]);
bestArm = (diff0 <= diff1 ? arm : arm ^ 1);
/* Make balance count from 16 to 4 to
* keep driver in sync with Firmware
*/
if ((bestArm == arm && pend0 > pend1 + lb_pending_cmds) ||
(bestArm != arm && pend1 > pend0 + lb_pending_cmds))
bestArm ^= 1;
/* Update the last accessed block on the correct pd */
io_info->span_arm =
(span << RAID_CTX_SPANARM_SPAN_SHIFT) | bestArm;
io_info->pd_after_lb = (bestArm == arm) ? pd0 : pd1;
}
lbInfo->last_accessed_block[io_info->pd_after_lb] = block + count - 1;
return io_info->pd_after_lb;
}
__le16 get_updated_dev_handle(struct megasas_instance *instance,
struct LD_LOAD_BALANCE_INFO *lbInfo,
struct IO_REQUEST_INFO *io_info,
struct MR_DRV_RAID_MAP_ALL *drv_map)
{
u8 arm_pd;
__le16 devHandle;
/* get best new arm (PD ID) */
arm_pd = megasas_get_best_arm_pd(instance, lbInfo, io_info, drv_map);
devHandle = MR_PdDevHandleGet(arm_pd, drv_map);
io_info->pd_interface = MR_PdInterfaceTypeGet(arm_pd, drv_map);
atomic_inc(&lbInfo->scsi_pending_cmds[arm_pd]);
return devHandle;
}
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