[PATCH] scsi: Allow error handling timeout to be specified

Martin K. Petersen
2013-05-10T03:11:58Z

Introduce eh_timeout which can be used for error handling purposes. This
was previously hardcoded to 10 seconds in the SCSI error handling
code. However, for some fast-fail scenarios it is necessary to be able
to tune this as it can take several iterations (bus device, target, bus,
controller) before we give up.

Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
index c1b05a8..91adc52 100644
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c
@@ -44,8 +44,6 @@

static void scsi_eh_done(struct scsi_cmnd *scmd);

-#define SENSE_TIMEOUT (10*HZ)
-
/*
* These should *probably* be handled by the host itself.
* Since it is allowed to sleep, it probably should.
@@ -864,7 +862,7 @@ static int scsi_send_eh_cmnd(struct scsi_cmnd *scmd, unsigned char *cmnd,
*/
static int scsi_request_sense(struct scsi_cmnd *scmd)
{
- return scsi_send_eh_cmnd(scmd, NULL, 0, SENSE_TIMEOUT, ~0);
+ return scsi_send_eh_cmnd(scmd, NULL, 0, scmd->device->eh_timeout, ~0);
}

/**
@@ -965,7 +963,8 @@ static int scsi_eh_tur(struct scsi_cmnd *scmd)
int retry_cnt = 1, rtn;

retry_tur:
- rtn = scsi_send_eh_cmnd(scmd, tur_command, 6, SENSE_TIMEOUT, 0);
+ rtn = scsi_send_eh_cmnd(scmd, tur_command, 6,
+ scmd->device->eh_timeout, 0);

SCSI_LOG_ERROR_RECOVERY(3, printk("%s: scmd %p rtn %x\n",
__func__, scmd, rtn));
diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
index b9e39e0..7f7bd1f 100644
--- a/drivers/scsi/scsi_scan.c
+++ b/drivers/scsi/scsi_scan.c
@@ -945,6 +945,7 @@ static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result,
}

sdev->max_queue_depth = sdev->queue_depth;
+ sdev->eh_timeout = SCSI_DEFAULT_EH_TIMEOUT;

/*
* Ok, the device is now all set up, we can
diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
index 931a7d9..38db310 100644
--- a/drivers/scsi/scsi_sysfs.c
+++ b/drivers/scsi/scsi_sysfs.c
@@ -560,6 +560,35 @@ sdev_store_timeout (struct device *dev, struct device_attribute *attr,
static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);

static ssize_t
+sdev_show_eh_timeout (struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct scsi_device *sdev;
+ sdev = to_scsi_device(dev);
+ return snprintf(buf, 20, "%u\n", sdev->eh_timeout / HZ);
+}
+
+static ssize_t
+sdev_store_eh_timeout (struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct scsi_device *sdev;
+ unsigned int eh_timeout;
+ int err;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+
+ sdev = to_scsi_device(dev);
+ err = kstrtouint(buf, 10, &eh_timeout);
+ if (err)
+ return err;
+ sdev->eh_timeout = eh_timeout * HZ;
+
+ return count;
+}
+static DEVICE_ATTR(eh_timeout, S_IRUGO | S_IWUSR, sdev_show_eh_timeout, sdev_store_eh_timeout);
+
+static ssize_t
store_rescan_field (struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
@@ -723,6 +752,7 @@ static struct attribute *scsi_sdev_attrs[] = {
&dev_attr_delete.attr,
&dev_attr_state.attr,
&dev_attr_timeout.attr,
+ &dev_attr_eh_timeout.attr,
&dev_attr_iocounterbits.attr,
&dev_attr_iorequest_cnt.attr,
&dev_attr_iodone_cnt.attr,
diff --git a/include/scsi/scsi.h b/include/scsi/scsi.h
index 66216c1..4b87d99 100644
--- a/include/scsi/scsi.h
+++ b/include/scsi/scsi.h
@@ -10,9 +10,14 @@

#include <linux/types.h>
#include <linux/scatterlist.h>
+#include <linux/kernel.h>

struct scsi_cmnd;

+enum scsi_timeouts {
+ SCSI_DEFAULT_EH_TIMEOUT = 10 * HZ,
+};
+
/*
* The maximum number of SG segments that we will put inside a
* scatterlist (unless chaining is used). Should ideally fit inside a
diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
index a7f9cba..7eb9b20 100644
--- a/include/scsi/scsi_device.h
+++ b/include/scsi/scsi_device.h
@@ -113,6 +113,7 @@ struct scsi_device {
* scsi_devinfo.[hc]. For now used only to
* pass settings from slave_alloc to scsi
* core. */
+ unsigned int eh_timeout; /* Error handling timeout */
unsigned writeable:1;
unsigned removable:1;
unsigned changed:1; /* Data invalid due to media change */