From: Mike Christie <michaelc@xxxxxxxxxxx>
This patch modifies scsi_host_tematepl->change_queue_depth so that
it takes an argument indicating why it is being called. This will be
used so that if a LLD needs to do some extra processing when
handling queue fulls or later ramp ups, it can do so.
To simplify the review, this patch only modifies scsi-ml. The next
patches will convert each driver.
Signed-off-by: Mike Christie <michaelc@xxxxxxxxxxx>
---
drivers/scsi/scsi_sysfs.c | 3 ++-
include/scsi/scsi_host.h | 9 ++++++++-
2 files changed, 10 insertions(+), 2 deletions(-)
diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
index 91482f2..c26c53c 100644
--- a/drivers/scsi/scsi_sysfs.c
+++ b/drivers/scsi/scsi_sysfs.c
@@ -766,7 +766,8 @@ sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr,
if (depth < 1)
return -EINVAL;
- retval = sht->change_queue_depth(sdev, depth);
+ retval = sht->change_queue_depth(sdev, depth,
+ SCSI_QDEPTH_SYSFS_REQ);
if (retval < 0)
return retval;
diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h
index b62a097..e0038fa 100644
--- a/include/scsi/scsi_host.h
+++ b/include/scsi/scsi_host.h
@@ -43,6 +43,13 @@ struct blk_queue_tags;
#define DISABLE_CLUSTERING 0
#define ENABLE_CLUSTERING 1
+enum {
+ SCSI_QDEPTH_SYSFS_REQ, /* user requested change through sysfs */
+ SCSI_QDEPTH_QFULL, /* scsi-ml requested due to queue full */
+ SCSI_QDEPTH_RAMP_UP, /* scsi-ml requested due to threshhold event */
+ SCSI_QDEPTH_RAMP_DOWN, /* LLD/class requested due to lld/class event */
+};
+
struct scsi_host_template {
struct module *module;
const char *name;
@@ -294,7 +301,7 @@ struct scsi_host_template {
*
* Status: OPTIONAL
*/
- int (* change_queue_depth)(struct scsi_device *, int);
+ int (* change_queue_depth)(struct scsi_device *, int, int);
/*
* Fill in this function to allow the changing of tag types
--
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