[S390] add PAV support to the dasd driver.
Add support for parallel-access-volumes to the dasd driver. This
allows concurrent access to dasd devices with multiple channel
programs.
Signed-off-by: Horst Hummel <horst.hummel@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c
index 7e9978a..bafcd2f 100644
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -1855,15 +1855,34 @@
{
int ret;
+ ret = ccw_device_set_options(cdev, CCWDEV_DO_PATHGROUP);
+ if (ret) {
+ printk(KERN_WARNING
+ "dasd_generic_probe: could not set ccw-device options "
+ "for %s\n", cdev->dev.bus_id);
+ return ret;
+ }
ret = dasd_add_sysfs_files(cdev);
if (ret) {
printk(KERN_WARNING
"dasd_generic_probe: could not add sysfs entries "
"for %s\n", cdev->dev.bus_id);
- } else {
- cdev->handler = &dasd_int_handler;
+ return ret;
}
+ cdev->handler = &dasd_int_handler;
+ /*
+ * Automatically online either all dasd devices (dasd_autodetect)
+ * or all devices specified with dasd= parameters during
+ * initial probe.
+ */
+ if ((dasd_get_feature(cdev, DASD_FEATURE_INITIAL_ONLINE) > 0 ) ||
+ (dasd_autodetect && dasd_busid_known(cdev->dev.bus_id) != 0))
+ ret = ccw_device_set_online(cdev);
+ if (ret)
+ printk(KERN_WARNING
+ "dasd_generic_probe: could not initially online "
+ "ccw-device %s\n", cdev->dev.bus_id);
return ret;
}
@@ -1911,6 +1930,8 @@
struct dasd_device *device;
int rc;
+ /* first online clears initial online feature flag */
+ dasd_set_feature(cdev, DASD_FEATURE_INITIAL_ONLINE, 0);
device = dasd_create_device(cdev);
if (IS_ERR(device))
return PTR_ERR(device);
@@ -2065,31 +2086,6 @@
return ret;
}
-/*
- * Automatically online either all dasd devices (dasd_autodetect) or
- * all devices specified with dasd= parameters.
- */
-static int
-__dasd_auto_online(struct device *dev, void *data)
-{
- struct ccw_device *cdev;
-
- cdev = to_ccwdev(dev);
- if (dasd_autodetect || dasd_busid_known(cdev->dev.bus_id) == 0)
- ccw_device_set_online(cdev);
- return 0;
-}
-
-void
-dasd_generic_auto_online (struct ccw_driver *dasd_discipline_driver)
-{
- struct device_driver *drv;
-
- drv = get_driver(&dasd_discipline_driver->driver);
- driver_for_each_device(drv, NULL, NULL, __dasd_auto_online);
- put_driver(drv);
-}
-
static int __init
dasd_init(void)
@@ -2170,5 +2166,4 @@
EXPORT_SYMBOL_GPL(dasd_generic_notify);
EXPORT_SYMBOL_GPL(dasd_generic_set_online);
EXPORT_SYMBOL_GPL(dasd_generic_set_offline);
-EXPORT_SYMBOL_GPL(dasd_generic_auto_online);