Adds sysfs functions to show or store sdev->queue_ramp_up_period.
Adds queue_ramp_up_period to sysfs if change_queue_depth is
supported since ramp up is needed only in case the dynamic
queue_depth change is supported first.
Initializes queue_ramp_up_period to 120HZ jiffies as initial
default value.
Signed-off-by: Vasu Dev <vasu.dev@xxxxxxxxx>
---
drivers/scsi/scsi_scan.c | 1 +
drivers/scsi/scsi_sysfs.c | 38 ++++++++++++++++++++++++++++++++++++--
include/scsi/scsi_device.h | 2 ++
3 files changed, 39 insertions(+), 2 deletions(-)
diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
index c447838..0e6db8b 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;
diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
index c26c53c..28dbc35 100644
--- a/drivers/scsi/scsi_sysfs.c
+++ b/drivers/scsi/scsi_sysfs.c
@@ -779,6 +779,36 @@ static struct device_attribute sdev_attr_queue_depth_rw =
sdev_store_queue_depth_rw);
static ssize_t
+sdev_show_queue_ramp_up_period(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct scsi_device *sdev;
+ sdev = to_scsi_device(dev);
+ return snprintf(buf, 20, "%lu\n", sdev->queue_ramp_up_period);
+}
+
+static ssize_t
+sdev_store_queue_ramp_up_period(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct scsi_device *sdev = to_scsi_device(dev);
+ unsigned long period;
+
+ if (strict_strtoul(buf, 10, &period))
+ return -EINVAL;
+
+ sdev->queue_ramp_up_period = period;
+ return period;
+}
+
+static struct device_attribute sdev_attr_queue_ramp_up_period =
+ __ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
+ sdev_show_queue_ramp_up_period,
+ sdev_store_queue_ramp_up_period);
+
+static ssize_t
sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
@@ -870,8 +900,12 @@ int scsi_sysfs_add_sdev(struct scsi_device *sdev)
get_device(&sdev->sdev_gendev);
/* create queue files, which may be writable, depending on the host */
- if (sdev->host->hostt->change_queue_depth)
- error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_depth_rw);
+ if (sdev->host->hostt->change_queue_depth) {
+ error = device_create_file(&sdev->sdev_gendev,
+ &sdev_attr_queue_depth_rw);
+ error = device_create_file(&sdev->sdev_gendev,
+ &sdev_attr_queue_ramp_up_period);
+ }
else
error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_depth);
if (error) {
diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
index 041d4f9..899f501 100644
--- a/include/scsi/scsi_device.h
+++ b/include/scsi/scsi_device.h
@@ -85,6 +85,8 @@ struct scsi_device {
unsigned short last_queue_full_count; /* scsi_track_queue_full() */
unsigned long last_queue_full_time; /* last queue full time */
unsigned long queue_ramp_up_period; /* ramp up period in jiffies */
+#define SCSI_DEFAULT_RAMP_UP_PERIOD (120 * HZ)
+
unsigned long last_queue_ramp_up; /* last queue ramp up time */
unsigned int id, lun, channel;
--
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