From d2552ebe885314d3c8352e35f2fae2a7478ac778 Mon Sep 17 00:00:00 2001 From: "Sumit.Saxena@avagotech.com" Date: Fri, 12 Sep 2014 18:57:53 +0530 Subject: [PATCH] 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 Signed-off-by: Kashyap Desai Reviewed-by: Tomas Henzl Signed-off-by: Christoph Hellwig --- drivers/scsi/megaraid/megaraid_sas.h | 8 +- drivers/scsi/megaraid/megaraid_sas_fp.c | 134 ++++++++++++-------- drivers/scsi/megaraid/megaraid_sas_fusion.c | 14 +- drivers/scsi/megaraid/megaraid_sas_fusion.h | 8 +- 4 files changed, 96 insertions(+), 68 deletions(-) diff --git a/drivers/scsi/megaraid/megaraid_sas.h b/drivers/scsi/megaraid/megaraid_sas.h index 5dedf09fc46d..156d4b97d2bd 100644 --- a/drivers/scsi/megaraid/megaraid_sas.h +++ b/drivers/scsi/megaraid/megaraid_sas.h @@ -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, diff --git a/drivers/scsi/megaraid/megaraid_sas_fp.c b/drivers/scsi/megaraid/megaraid_sas_fp.c index c2eaf6ef3d11..685e6f391fe4 100644 --- a/drivers/scsi/megaraid/megaraid_sas_fp.c +++ b/drivers/scsi/megaraid/megaraid_sas_fp.c @@ -55,6 +55,13 @@ #include "megaraid_sas.h" #include +#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; } diff --git a/drivers/scsi/megaraid/megaraid_sas_fusion.c b/drivers/scsi/megaraid/megaraid_sas_fusion.c index d35ac34ea624..54c720ccb3e6 100644 --- a/drivers/scsi/megaraid/megaraid_sas_fusion.c +++ b/drivers/scsi/megaraid/megaraid_sas_fusion.c @@ -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; } diff --git a/drivers/scsi/megaraid/megaraid_sas_fusion.h b/drivers/scsi/megaraid/megaraid_sas_fusion.h index 065c27031c9c..75844260fae9 100644 --- a/drivers/scsi/megaraid/megaraid_sas_fusion.h +++ b/drivers/scsi/megaraid/megaraid_sas_fusion.h @@ -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 */ -- 2.20.1