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[SCSI] hpsa: allow modifying device queue depth. 

Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
hifive-unleashed-5.1
Stephen M. Cameron 2010-02-25 14:02:51 -06:00 committed by James Bottomley
parent b0f4d4cf12
commit 667e23d4e9
1 changed files with 21 additions and 0 deletions
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21
drivers/scsi/hpsa.c
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@ -43,6 +43,7 @@
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_tcq.h>
#include <linux/cciss_ioctl.h>
#include <linux/string.h>
#include <linux/bitmap.h>
@ -134,6 +135,8 @@ static int hpsa_scsi_queue_command(struct scsi_cmnd *cmd,
static void hpsa_scan_start(struct Scsi_Host *);
static int hpsa_scan_finished(struct Scsi_Host *sh,
unsigned long elapsed_time);
static int hpsa_change_queue_depth(struct scsi_device *sdev,
int qdepth, int reason);
static int hpsa_eh_device_reset_handler(struct scsi_cmnd *scsicmd);
static int hpsa_slave_alloc(struct scsi_device *sdev);
@ -182,6 +185,7 @@ static struct scsi_host_template hpsa_driver_template = {
.queuecommand = hpsa_scsi_queue_command,
.scan_start = hpsa_scan_start,
.scan_finished = hpsa_scan_finished,
.change_queue_depth = hpsa_change_queue_depth,
.this_id = -1,
.sg_tablesize = MAXSGENTRIES,
.use_clustering = ENABLE_CLUSTERING,
@ -2077,6 +2081,23 @@ static int hpsa_scan_finished(struct Scsi_Host *sh,
return finished;
}
static int hpsa_change_queue_depth(struct scsi_device *sdev,
int qdepth, int reason)
{
struct ctlr_info *h = sdev_to_hba(sdev);
if (reason != SCSI_QDEPTH_DEFAULT)
return -ENOTSUPP;
if (qdepth < 1)
qdepth = 1;
else
if (qdepth > h->nr_cmds)
qdepth = h->nr_cmds;
scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth);
return sdev->queue_depth;
}
static void hpsa_unregister_scsi(struct ctlr_info *h)
{
/* we are being forcibly unloaded, and may not refuse. */