[PATCH 1/9] hpsa: allow modifying device queue depth.

Stephen M. Cameron
2010-02-25T19:59:42Z

hpsa: allow modifying device queue depth.

Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
---
drivers/scsi/hpsa.c | 21 +++++++++++++++++++++
1 files changed, 21 insertions(+), 0 deletions(-)

diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
index 03697ba..745c624 100644
--- a/drivers/scsi/hpsa.c
+++ b/drivers/scsi/hpsa.c
@@ -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. */