#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
*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;
}
*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;
}
*
*/
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;
}
-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;
}
projects / linux-2.6-block.git / blobdiff