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authorHannes Reinecke <hare@suse.de>2013-01-30 09:26:18 +0000
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2013-07-01 17:31:25 +0200
commit3d71ad32167c9124d5621b54c37a74ef38aa93b0 (patch)
treef9f5eb8ff804adc07c72b337e0743580bbd4bdcc /drivers/s390
parent80bd7181b036c7b4118eb19cfff3b555889596e6 (diff)
s390/dasd: Add 'timeout' attribute
This patch adds a 'timeout' attibute to the DASD driver. When set to non-zero, the blk_timeout function will be enabled with the timeout specified in the attribute. Setting 'timeout' to '0' will disable block timeouts. Signed-off-by: Hannes Reinecke <hare@suse.de> Signed-off-by: Stefan Weinhuber <wein@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390')
-rw-r--r--drivers/s390/block/dasd.c2
-rw-r--r--drivers/s390/block/dasd_devmap.c56
-rw-r--r--drivers/s390/block/dasd_int.h4
3 files changed, 62 insertions, 0 deletions
diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c
index b97624bf183d..54f4bb8060c1 100644
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -2894,6 +2894,8 @@ enum blk_eh_timer_return dasd_times_out(struct request *req)
return BLK_EH_NOT_HANDLED;
device = cqr->startdev ? cqr->startdev : block->base;
+ if (!device->blk_timeout)
+ return BLK_EH_RESET_TIMER;
DBF_DEV_EVENT(DBF_WARNING, device,
" dasd_times_out cqr %p status %x",
cqr, cqr->status);
diff --git a/drivers/s390/block/dasd_devmap.c b/drivers/s390/block/dasd_devmap.c
index bc3e7afac18b..58bc6eb49de1 100644
--- a/drivers/s390/block/dasd_devmap.c
+++ b/drivers/s390/block/dasd_devmap.c
@@ -1280,6 +1280,61 @@ dasd_retries_store(struct device *dev, struct device_attribute *attr,
static DEVICE_ATTR(retries, 0644, dasd_retries_show, dasd_retries_store);
+static ssize_t
+dasd_timeout_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct dasd_device *device;
+ int len;
+
+ device = dasd_device_from_cdev(to_ccwdev(dev));
+ if (IS_ERR(device))
+ return -ENODEV;
+ len = snprintf(buf, PAGE_SIZE, "%lu\n", device->blk_timeout);
+ dasd_put_device(device);
+ return len;
+}
+
+static ssize_t
+dasd_timeout_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct dasd_device *device;
+ struct request_queue *q;
+ unsigned long val, flags;
+
+ device = dasd_device_from_cdev(to_ccwdev(dev));
+ if (IS_ERR(device) || !device->block)
+ return -ENODEV;
+
+ if ((strict_strtoul(buf, 10, &val) != 0) ||
+ val > UINT_MAX / HZ) {
+ dasd_put_device(device);
+ return -EINVAL;
+ }
+ q = device->block->request_queue;
+ if (!q) {
+ dasd_put_device(device);
+ return -ENODEV;
+ }
+ spin_lock_irqsave(&device->block->request_queue_lock, flags);
+ if (!val)
+ blk_queue_rq_timed_out(q, NULL);
+ else
+ blk_queue_rq_timed_out(q, dasd_times_out);
+
+ device->blk_timeout = val;
+
+ blk_queue_rq_timeout(q, device->blk_timeout * HZ);
+ spin_unlock_irqrestore(&device->block->request_queue_lock, flags);
+
+ dasd_put_device(device);
+ return count;
+}
+
+static DEVICE_ATTR(timeout, 0644,
+ dasd_timeout_show, dasd_timeout_store);
+
static ssize_t dasd_reservation_policy_show(struct device *dev,
struct device_attribute *attr,
char *buf)
@@ -1391,6 +1446,7 @@ static struct attribute * dasd_attrs[] = {
&dev_attr_failfast.attr,
&dev_attr_expires.attr,
&dev_attr_retries.attr,
+ &dev_attr_timeout.attr,
&dev_attr_reservation_policy.attr,
&dev_attr_last_known_reservation_state.attr,
&dev_attr_safe_offline.attr,
diff --git a/drivers/s390/block/dasd_int.h b/drivers/s390/block/dasd_int.h
index ad42075868c7..2bd03f45a72e 100644
--- a/drivers/s390/block/dasd_int.h
+++ b/drivers/s390/block/dasd_int.h
@@ -470,6 +470,8 @@ struct dasd_device {
unsigned long default_expires;
unsigned long default_retries;
+ unsigned long blk_timeout;
+
struct dentry *debugfs_dentry;
struct dasd_profile profile;
};
@@ -663,6 +665,8 @@ void dasd_free_device(struct dasd_device *);
struct dasd_block *dasd_alloc_block(void);
void dasd_free_block(struct dasd_block *);
+enum blk_eh_timer_return dasd_times_out(struct request *req);
+
void dasd_enable_device(struct dasd_device *);
void dasd_set_target_state(struct dasd_device *, int);
void dasd_kick_device(struct dasd_device *);