[SCSI] mvsas: performance improvement using domain_device->lldd_dev

Using sticky field to improve retrieve performance by eliminating some
lookups in . Remove some spurious casts.

Signed-off-by: Ying Chu <jasonchu@marvell.com>
Signed-off-by: Andy Yan <ayan@marvell.com>
Signed-off-by: Ke Wei <kewei@marvell.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

1 files changed, 14 insertions, 15 deletions

diff --git a/drivers/scsi/mvsas/mv_sas.c b/drivers/scsi/mvsas/mv_sas.c
index 3fc396fc050d..c05e4c05a414 100644
--- a/drivers/scsi/mvsas/mv_sas.c
+++ b/drivers/scsi/mvsas/mv_sas.c
@@ -225,7 +225,8 @@ struct mvs_info *mvs_find_dev_mvi(struct domain_device *dev)
 int mvs_find_dev_phyno(struct domain_device *dev, int *phyno)
 {
         unsigned long i = 0, j = 0, n = 0, num = 0;
-        struct mvs_info *mvi = mvs_find_dev_mvi(dev);
+        struct mvs_device *mvi_dev = (struct mvs_device *)dev->lldd_dev;
+        struct mvs_info *mvi = mvi_dev->mvi_info;
         struct sas_ha_struct *sha = dev->port->ha;
 
         while (sha->sas_port[i]) {
@@ -872,8 +873,8 @@ static int mvs_task_exec(struct sas_task *task, const int num, gfp_t gfp_flags,
                                 struct mvs_tmf_task *tmf)
 {
         struct domain_device *dev = task->dev;
-        struct mvs_info *mvi;
-        struct mvs_device *mvi_dev;
+        struct mvs_device *mvi_dev = (struct mvs_device *)dev->lldd_dev;
+        struct mvs_info *mvi = mvi_dev->mvi_info;
         struct mvs_task_exec_info tei;
         struct sas_task *t = task;
         struct mvs_slot_info *slot;
@@ -890,8 +891,6 @@ static int mvs_task_exec(struct sas_task *task, const int num, gfp_t gfp_flags,
                 return 0;
         }
 
-        mvi = mvs_find_dev_mvi(task->dev);
-
         spin_lock_irqsave(&mvi->lock, flags);
         do {
                 dev = t->dev;
@@ -1320,7 +1319,7 @@ int mvs_dev_found_notify(struct domain_device *dev, int lock)
         }
         dev->lldd_dev = (void *)mvi_device;
         mvi_device->dev_type = dev->dev_type;
-
+        mvi_device->mvi_info = mvi;
         if (parent_dev && DEV_IS_EXPANDER(parent_dev->dev_type)) {
                 int phy_id;
                 u8 phy_num = parent_dev->ex_dev.num_phys;
@@ -1357,10 +1356,8 @@ int mvs_dev_found(struct domain_device *dev)
 void mvs_dev_gone_notify(struct domain_device *dev, int lock)
 {
         unsigned long flags = 0;
-        struct mvs_info *mvi;
         struct mvs_device *mvi_dev = (struct mvs_device *)dev->lldd_dev;
-
-        mvi = mvs_find_dev_mvi(dev);
+        struct mvs_info *mvi = mvi_dev->mvi_info;
 
         if (lock)
                 spin_lock_irqsave(&mvi->lock, flags);
@@ -1535,8 +1532,8 @@ int mvs_lu_reset(struct domain_device *dev, u8 *lun)
         unsigned long flags;
         int i, phyno[WIDE_PORT_MAX_PHY], num , rc = TMF_RESP_FUNC_FAILED;
         struct mvs_tmf_task tmf_task;
-        struct mvs_info *mvi = mvs_find_dev_mvi(dev);
         struct mvs_device * mvi_dev = (struct mvs_device *)dev->lldd_dev;
+        struct mvs_info *mvi = mvi_dev->mvi_info;
 
         tmf_task.tmf = TMF_LU_RESET;
         mvi_dev->dev_status = MVS_DEV_EH;
@@ -1558,8 +1555,8 @@ int mvs_I_T_nexus_reset(struct domain_device *dev)
 {
         unsigned long flags;
         int i, phyno[WIDE_PORT_MAX_PHY], num , rc = TMF_RESP_FUNC_FAILED;
-        struct mvs_info *mvi = mvs_find_dev_mvi(dev);
-        struct mvs_device *mvi_dev = (struct mvs_device *)dev->lldd_dev;
+        struct mvs_device * mvi_dev = (struct mvs_device *)dev->lldd_dev;
+        struct mvs_info *mvi = mvi_dev->mvi_info;
 
         if (mvi_dev->dev_status != MVS_DEV_EH)
                 return TMF_RESP_FUNC_COMPLETE;
@@ -1587,7 +1584,8 @@ int mvs_query_task(struct sas_task *task)
         if (task->lldd_task && task->task_proto & SAS_PROTOCOL_SSP) {
                 struct scsi_cmnd * cmnd = (struct scsi_cmnd *)task->uldd_task;
                 struct domain_device *dev = task->dev;
-                struct mvs_info *mvi = mvs_find_dev_mvi(dev);
+                struct mvs_device *mvi_dev = (struct mvs_device *)dev->lldd_dev;
+                struct mvs_info *mvi = mvi_dev->mvi_info;
 
                 int_to_scsilun(cmnd->device->lun, &lun);
                 rc = mvs_find_tag(mvi, task, &tag);
@@ -1619,10 +1617,12 @@ int mvs_abort_task(struct sas_task *task)
         struct scsi_lun lun;
         struct mvs_tmf_task tmf_task;
         struct domain_device *dev = task->dev;
-        struct mvs_info *mvi = mvs_find_dev_mvi(dev);
+        struct mvs_device *mvi_dev = (struct mvs_device *)dev->lldd_dev;
+        struct mvs_info *mvi = mvi_dev->mvi_info;
         int rc = TMF_RESP_FUNC_FAILED;
         unsigned long flags;
         u32 tag;
+
         if (mvi->exp_req)
                 mvi->exp_req--;
         spin_lock_irqsave(&task->task_state_lock, flags);
@@ -1652,7 +1652,6 @@ int mvs_abort_task(struct sas_task *task)
                 if (rc == TMF_RESP_FUNC_COMPLETE) {
                         u32 slot_no;
                         struct mvs_slot_info *slot;
-                        struct mvs_info *mvi = mvs_find_dev_mvi(dev);
 
                         if (task->lldd_task) {
                                 slot = (struct mvs_slot_info *)task->lldd_task;