diff options
| author | Vasu Dev <vasu.dev@intel.com> | 2009-10-23 02:46:33 +0400 |
|---|---|---|
| committer | James Bottomley <James.Bottomley@suse.de> | 2009-12-04 21:00:44 +0300 |
| commit | 4a84067dbfce436b81779e585bf712b02ceee552 (patch) | |
| tree | f787d413a11c6564ad4440d0a245f56d0e6b73bf /drivers/scsi/scsi_scan.c | |
| parent | 14caf44c69184ed72d46a2f883311daf27a4192f (diff) | |
| download | linux-4a84067dbfce436b81779e585bf712b02ceee552.tar.xz | |
[SCSI] add queue_depth ramp up code
Current FC HBA queue_depth ramp up code depends on last queue
full time. The sdev already has last_queue_full_time field to
track last queue full time but stored value is truncated by
last four bits.
So this patch updates last_queue_full_time without truncating
last 4 bits to store full value and then updates its only
current usages in scsi_track_queue_full to ignore last four bits
to keep current usages same while also use this field
in added ramp up code.
Adds scsi_handle_queue_ramp_up to ramp up queue_depth on
successful completion of IO. The scsi_handle_queue_ramp_up will
do ramp up on all luns of a target, just same as ramp down done
on all luns on a target.
The ramp up is skipped in case the change_queue_depth is not
supported by LLD or already reached to added max_queue_depth.
Updates added max_queue_depth on every new update to default
queue_depth value.
The ramp up is also skipped if lapsed time since either last
queue ramp up or down is less than LLD specified
queue_ramp_up_period.
Adds queue_ramp_up_period to sysfs but only if change_queue_depth
is supported since ramp up and queue_ramp_up_period is needed only
in case change_queue_depth is supported first.
Initializes queue_ramp_up_period to 120HZ jiffies as initial
default value, it is same as used in existing lpfc and qla2xxx.
-v2
Combined all ramp code into this single patch.
-v3
Moves max_queue_depth initialization after slave_configure is
called from after slave_alloc calling done. Also adjusted
max_queue_depth check to skip ramp up if current queue_depth
is >= max_queue_depth.
-v4
Changes sdev->queue_ramp_up_period unit to ms when using sysfs i/f
to store or show its value.
Signed-off-by: Vasu Dev <vasu.dev@intel.com>
Tested-by: Christof Schmitt <christof.schmitt@de.ibm.com>
Tested-by: Giridhar Malavali <giridhar.malavali@qlogic.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Diffstat (limited to 'drivers/scsi/scsi_scan.c')
| -rw-r--r-- | drivers/scsi/scsi_scan.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c index 0547a7f44d42..50526fa207e5 100644 --- a/drivers/scsi/scsi_scan.c +++ b/drivers/scsi/scsi_scan.c @@ -251,6 +251,7 @@ static struct scsi_device *scsi_alloc_sdev(struct scsi_target *starget, sdev->model = scsi_null_device_strs; sdev->rev = scsi_null_device_strs; sdev->host = shost; + sdev->queue_ramp_up_period = SCSI_DEFAULT_RAMP_UP_PERIOD; sdev->id = starget->id; sdev->lun = lun; sdev->channel = starget->channel; @@ -941,6 +942,8 @@ static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result, } } + sdev->max_queue_depth = sdev->queue_depth; + /* * Ok, the device is now all set up, we can * register it and tell the rest of the kernel |