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[SCSI] libsas: dynamic queue depth

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The queue-depth for libsas-attached devices initializes to 32 and can
only be increased manually via sysfs to a max of 64, while mpt2sas
attached devices initialize to 254 and dynamically float via the
midlayer ->change_queue_depth interface.

No performance regression was observed with this change on the isci
driver.

Tested-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
Dan Williams 2011-09-20 15:10:46 -07:00 committed by James Bottomley
parent f6e67035a9
commit 97a1420d12
1 changed files with 17 additions and 20 deletions
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37
drivers/scsi/libsas/sas_scsi_host.c
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@ -761,8 +761,7 @@ int sas_target_alloc(struct scsi_target *starget)
return 0;
}
#define SAS_DEF_QD 32
#define SAS_MAX_QD 64
#define SAS_DEF_QD 256
int sas_slave_configure(struct scsi_device *scsi_dev)
{
@ -805,31 +804,29 @@ void sas_slave_destroy(struct scsi_device *scsi_dev)
dev->sata_dev.ap->link.device[0].class = ATA_DEV_NONE;
}
int sas_change_queue_depth(struct scsi_device *scsi_dev, int new_depth,
int reason)
int sas_change_queue_depth(struct scsi_device *sdev, int depth, int reason)
{
struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
int res = min(new_depth, SAS_MAX_QD);
struct domain_device *dev = sdev_to_domain_dev(sdev);
if (dev_is_sata(dev))
return __ata_change_queue_depth(dev->sata_dev.ap, scsi_dev,
new_depth, reason);
return __ata_change_queue_depth(dev->sata_dev.ap, sdev, depth,
reason);
if (reason != SCSI_QDEPTH_DEFAULT)
switch (reason) {
case SCSI_QDEPTH_DEFAULT:
case SCSI_QDEPTH_RAMP_UP:
if (!sdev->tagged_supported)
depth = 1;
scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
break;
case SCSI_QDEPTH_QFULL:
scsi_track_queue_full(sdev, depth);
break;
default:
return -EOPNOTSUPP;
if (scsi_dev->tagged_supported)
scsi_adjust_queue_depth(scsi_dev, scsi_get_tag_type(scsi_dev),
res);
else {
sas_printk("device %llx LUN %x queue depth changed to 1\n",
SAS_ADDR(dev->sas_addr),
scsi_dev->lun);
scsi_adjust_queue_depth(scsi_dev, 0, 1);
res = 1;
}
return res;
return depth;
}
int sas_change_queue_type(struct scsi_device *scsi_dev, int qt)