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megaraid_sas : N-drive primary raid level 1 load balancing 

Resending the patch. Addressed the review comments from Tomas Henzl.

Current driver does fast path read load balancing between arm and mirror disk
for two Drive Raid-1 configuration only.

Now, Driver support fast path read load balancing for all (any number of disk) Raid-1 configuration.

Signed-off-by: Sumit Saxena <sumit.saxena@avagotech.com>
Signed-off-by: Kashyap Desai <kashyap.desai@avagotech.com>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Sumit.Saxena@avagotech.com 2014-09-12 18:57:53 +05:30 committed by Christoph Hellwig
parent ac95136ad4
commit d2552ebe88
4 changed files with 96 additions and 68 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/scsi/megaraid/megaraid_sas.h
View File

@ -1188,7 +1188,8 @@ union megasas_sgl_frame {
typedef union _MFI_CAPABILITIES {
struct {
#if defined(__BIG_ENDIAN_BITFIELD)
u32 reserved:28;
u32 reserved:27;
u32 support_ndrive_r1_lb:1;
u32 support_max_255lds:1;
u32 reserved1:1;
u32 support_additional_msix:1;
@ -1198,7 +1199,8 @@ typedef union _MFI_CAPABILITIES {
u32 support_additional_msix:1;
u32 reserved1:1;
u32 support_max_255lds:1;
u32 reserved:28;
u32 support_ndrive_r1_lb:1;
u32 reserved:27;
#endif
} mfi_capabilities;
u32 reg;
@ -1914,6 +1916,8 @@ u16 MR_LdSpanArrayGet(u32 ld, u32 span, struct MR_DRV_RAID_MAP_ALL *map);
u16 MR_PdDevHandleGet(u32 pd, struct MR_DRV_RAID_MAP_ALL *map);
u16 MR_GetLDTgtId(u32 ld, struct MR_DRV_RAID_MAP_ALL *map);
u16 get_updated_dev_handle(struct megasas_instance *instance,
struct LD_LOAD_BALANCE_INFO *lbInfo, struct IO_REQUEST_INFO *in_info);
void mr_update_load_balance_params(struct MR_DRV_RAID_MAP_ALL *map,
struct LD_LOAD_BALANCE_INFO *lbInfo);
int megasas_get_ctrl_info(struct megasas_instance *instance,

134
drivers/scsi/megaraid/megaraid_sas_fp.c
View File

@ -55,6 +55,13 @@
#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, S_IRUGO);
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 FALSE 0
@ -769,6 +776,7 @@ static u8 mr_spanset_get_phy_params(struct megasas_instance *instance, u32 ld,
*pdBlock += stripRef + le64_to_cpu(MR_LdSpanPtrGet(ld, span, map)->startBlk);
pRAID_Context->spanArm = (span << RAID_CTX_SPANARM_SPAN_SHIFT) |
physArm;
io_info->span_arm = pRAID_Context->spanArm;
return retval;
}
@ -865,6 +873,7 @@ u8 MR_GetPhyParams(struct megasas_instance *instance, u32 ld, u64 stripRow,
*pdBlock += stripRef + le64_to_cpu(MR_LdSpanPtrGet(ld, span, map)->startBlk);
pRAID_Context->spanArm = (span << RAID_CTX_SPANARM_SPAN_SHIFT) |
physArm;
io_info->span_arm = pRAID_Context->spanArm;
return retval;
}
@ -1131,7 +1140,7 @@ MR_BuildRaidContext(struct megasas_instance *instance,
*
*/
void mr_update_span_set(struct MR_DRV_RAID_MAP_ALL *map,
PLD_SPAN_INFO ldSpanInfo)
PLD_SPAN_INFO ldSpanInfo)
{
u8 span, count;
u32 element, span_row_width;
@ -1239,90 +1248,105 @@ void mr_update_span_set(struct MR_DRV_RAID_MAP_ALL *map,
}
void
mr_update_load_balance_params(struct MR_DRV_RAID_MAP_ALL *map,
struct LD_LOAD_BALANCE_INFO *lbInfo)
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, map);
ld = MR_TargetIdToLdGet(ldCount, drv_map);
if (ld >= MAX_LOGICAL_DRIVES_EXT) {
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
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;
}
}
u8 megasas_get_best_arm(struct LD_LOAD_BALANCE_INFO *lbInfo, u8 arm, u64 block,
u32 count)
u8 megasas_get_best_arm_pd(struct megasas_instance *instance,
struct LD_LOAD_BALANCE_INFO *lbInfo, struct IO_REQUEST_INFO *io_info)
{
u16 pend0, pend1;
struct fusion_context *fusion;
struct MR_LD_RAID *raid;
struct MR_DRV_RAID_MAP_ALL *drv_map;
u16 pend0, pend1, ld;
u64 diff0, diff1;
u8 bestArm;
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);
fusion = instance->ctrl_context;
drv_map = fusion->ld_drv_map[(instance->map_id & 1)];
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 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]);
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[0]);
diff1 = ABS_DIFF(block, lbInfo->last_accessed_block[1]);
bestArm = (diff0 <= diff1 ? 0 : 1);
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 + 4) ||
(bestArm != arm && pend1 > pend0 + 4))
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 */
lbInfo->last_accessed_block[bestArm] = block + count - 1;
return bestArm;
io_info->pd_after_lb = (bestArm == arm) ? pd0 : pd1;
lbInfo->last_accessed_block[io_info->pd_after_lb] = block + count - 1;
io_info->span_arm = (span << RAID_CTX_SPANARM_SPAN_SHIFT) | bestArm;
#if SPAN_DEBUG
if (arm != bestArm)
dev_dbg(&instance->pdev->dev, "LSI Debug R1 Load balance "
"occur - span 0x%x arm 0x%x bestArm 0x%x "
"io_info->span_arm 0x%x\n",
span, arm, bestArm, io_info->span_arm);
#endif
return io_info->pd_after_lb;
}
u16 get_updated_dev_handle(struct LD_LOAD_BALANCE_INFO *lbInfo,
struct IO_REQUEST_INFO *io_info)
u16 get_updated_dev_handle(struct megasas_instance *instance,
struct LD_LOAD_BALANCE_INFO *lbInfo, struct IO_REQUEST_INFO *io_info)
{
u8 arm, old_arm;
u8 arm_pd;
u16 devHandle;
struct fusion_context *fusion;
struct MR_DRV_RAID_MAP_ALL *drv_map;
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]);
fusion = instance->ctrl_context;
drv_map = fusion->ld_drv_map[(instance->map_id & 1)];
/* get best new arm (PD ID) */
arm_pd = megasas_get_best_arm_pd(instance, lbInfo, io_info);
devHandle = MR_PdDevHandleGet(arm_pd, drv_map);
atomic_inc(&lbInfo->scsi_pending_cmds[arm_pd]);
return devHandle;
}

14
drivers/scsi/megaraid/megaraid_sas_fusion.c
View File

@ -76,8 +76,6 @@ megasas_issue_polled(struct megasas_instance *instance,
void
megasas_check_and_restore_queue_depth(struct megasas_instance *instance);
u16 get_updated_dev_handle(struct LD_LOAD_BALANCE_INFO *lbInfo,
struct IO_REQUEST_INFO *in_info);
int megasas_transition_to_ready(struct megasas_instance *instance, int ocr);
void megaraid_sas_kill_hba(struct megasas_instance *instance);
@ -654,6 +652,8 @@ megasas_ioc_init_fusion(struct megasas_instance *instance)
= 1;
init_frame->driver_operations.mfi_capabilities.support_max_255lds
= 1;
init_frame->driver_operations.mfi_capabilities.support_ndrive_r1_lb
= 1;
/* Convert capability to LE32 */
cpu_to_le32s((u32 *)&init_frame->driver_operations.mfi_capabilities);
@ -1606,10 +1606,11 @@ megasas_build_ldio_fusion(struct megasas_instance *instance,
if ((fusion->load_balance_info[device_id].loadBalanceFlag) &&
(io_info.isRead)) {
io_info.devHandle =
get_updated_dev_handle(
get_updated_dev_handle(instance,
&fusion->load_balance_info[device_id],
&io_info);
scp->SCp.Status |= MEGASAS_LOAD_BALANCE_FLAG;
cmd->pd_r1_lb = io_info.pd_after_lb;
} else
scp->SCp.Status &= ~MEGASAS_LOAD_BALANCE_FLAG;
cmd->request_desc->SCSIIO.DevHandle = io_info.devHandle;
@ -1942,7 +1943,7 @@ complete_cmd_fusion(struct megasas_instance *instance, u32 MSIxIndex)
struct megasas_cmd *cmd_mfi;
struct megasas_cmd_fusion *cmd_fusion;
u16 smid, num_completed;
u8 reply_descript_type, arm;
u8 reply_descript_type;
u32 status, extStatus, device_id;
union desc_value d_val;
struct LD_LOAD_BALANCE_INFO *lbinfo;
@ -1993,10 +1994,7 @@ complete_cmd_fusion(struct megasas_instance *instance, u32 MSIxIndex)
lbinfo = &fusion->load_balance_info[device_id];
if (cmd_fusion->scmd->SCp.Status &
MEGASAS_LOAD_BALANCE_FLAG) {
arm = lbinfo->raid1DevHandle[0] ==
cmd_fusion->io_request->DevHandle ? 0 :
1;
atomic_dec(&lbinfo->scsi_pending_cmds[arm]);
atomic_dec(&lbinfo->scsi_pending_cmds[cmd_fusion->pd_r1_lb]);
cmd_fusion->scmd->SCp.Status &=
~MEGASAS_LOAD_BALANCE_FLAG;
}

8
drivers/scsi/megaraid/megaraid_sas_fusion.h
View File

@ -630,6 +630,8 @@ struct IO_REQUEST_INFO {
u8 start_span;
u8 reserved;
u64 start_row;
u8 span_arm; /* span[7:5], arm[4:0] */
u8 pd_after_lb;
};
struct MR_LD_TARGET_SYNC {
@ -681,14 +683,14 @@ struct megasas_cmd_fusion {
u32 sync_cmd_idx;
u32 index;
u8 flags;
u8 pd_r1_lb;
};
struct LD_LOAD_BALANCE_INFO {
u8 loadBalanceFlag;
u8 reserved1;
u16 raid1DevHandle[2];
atomic_t scsi_pending_cmds[2];
u64 last_accessed_block[2];
atomic_t scsi_pending_cmds[MAX_PHYSICAL_DEVICES];
u64 last_accessed_block[MAX_PHYSICAL_DEVICES];
};
/* SPAN_SET is info caclulated from span info from Raid map per LD */