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authorSebastian Ott <sebott@linux.vnet.ibm.com>2009-06-16 10:30:22 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2009-06-16 10:31:09 +0200
commitdcbd16d5111258df7c821ec1e4124fe6ffbf3c16 (patch)
treeee095cc2a4fc2a81bde256f8125b0199fe02a9ff /drivers/s390/cio/css.c
parent7e597a21a1470b12428cb0edd03c40986026451f (diff)
[S390] pm: css bus power management callbacks
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390/cio/css.c')
-rw-r--r--drivers/s390/cio/css.c157
1 files changed, 152 insertions, 5 deletions
diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c
index 0085d890179..85d43c6bcb6 100644
--- a/drivers/s390/cio/css.c
+++ b/drivers/s390/cio/css.c
@@ -1,10 +1,10 @@
/*
- * drivers/s390/cio/css.c
- * driver for channel subsystem
+ * driver for channel subsystem
*
- * Copyright IBM Corp. 2002,2008
- * Author(s): Arnd Bergmann (arndb@de.ibm.com)
- * Cornelia Huck (cornelia.huck@de.ibm.com)
+ * Copyright IBM Corp. 2002, 2009
+ *
+ * Author(s): Arnd Bergmann (arndb@de.ibm.com)
+ * Cornelia Huck (cornelia.huck@de.ibm.com)
*/
#define KMSG_COMPONENT "cio"
@@ -17,6 +17,7 @@
#include <linux/errno.h>
#include <linux/list.h>
#include <linux/reboot.h>
+#include <linux/suspend.h>
#include <asm/isc.h>
#include <asm/crw.h>
@@ -780,6 +781,79 @@ static struct notifier_block css_reboot_notifier = {
};
/*
+ * Since the css devices are neither on a bus nor have a class
+ * nor have a special device type, we cannot stop/restart channel
+ * path measurements via the normal suspend/resume callbacks, but have
+ * to use notifiers.
+ */
+static int css_power_event(struct notifier_block *this, unsigned long event,
+ void *ptr)
+{
+ void *secm_area;
+ int ret, i;
+
+ switch (event) {
+ case PM_HIBERNATION_PREPARE:
+ case PM_SUSPEND_PREPARE:
+ ret = NOTIFY_DONE;
+ for (i = 0; i <= __MAX_CSSID; i++) {
+ struct channel_subsystem *css;
+
+ css = channel_subsystems[i];
+ mutex_lock(&css->mutex);
+ if (!css->cm_enabled) {
+ mutex_unlock(&css->mutex);
+ continue;
+ }
+ secm_area = (void *)get_zeroed_page(GFP_KERNEL |
+ GFP_DMA);
+ if (secm_area) {
+ if (__chsc_do_secm(css, 0, secm_area))
+ ret = NOTIFY_BAD;
+ free_page((unsigned long)secm_area);
+ } else
+ ret = NOTIFY_BAD;
+
+ mutex_unlock(&css->mutex);
+ }
+ break;
+ case PM_POST_HIBERNATION:
+ case PM_POST_SUSPEND:
+ ret = NOTIFY_DONE;
+ for (i = 0; i <= __MAX_CSSID; i++) {
+ struct channel_subsystem *css;
+
+ css = channel_subsystems[i];
+ mutex_lock(&css->mutex);
+ if (!css->cm_enabled) {
+ mutex_unlock(&css->mutex);
+ continue;
+ }
+ secm_area = (void *)get_zeroed_page(GFP_KERNEL |
+ GFP_DMA);
+ if (secm_area) {
+ if (__chsc_do_secm(css, 1, secm_area))
+ ret = NOTIFY_BAD;
+ free_page((unsigned long)secm_area);
+ } else
+ ret = NOTIFY_BAD;
+
+ mutex_unlock(&css->mutex);
+ }
+ /* search for subchannels, which appeared during hibernation */
+ css_schedule_reprobe();
+ break;
+ default:
+ ret = NOTIFY_DONE;
+ }
+ return ret;
+
+}
+static struct notifier_block css_power_notifier = {
+ .notifier_call = css_power_event,
+};
+
+/*
* Now that the driver core is running, we can setup our channel subsystem.
* The struct subchannel's are created during probing (except for the
* static console subchannel).
@@ -852,6 +926,11 @@ init_channel_subsystem (void)
ret = register_reboot_notifier(&css_reboot_notifier);
if (ret)
goto out_unregister;
+ ret = register_pm_notifier(&css_power_notifier);
+ if (ret) {
+ unregister_reboot_notifier(&css_reboot_notifier);
+ goto out_unregister;
+ }
css_init_done = 1;
/* Enable default isc for I/O subchannels. */
@@ -953,6 +1032,73 @@ static int css_uevent(struct device *dev, struct kobj_uevent_env *env)
return ret;
}
+static int css_pm_prepare(struct device *dev)
+{
+ struct subchannel *sch = to_subchannel(dev);
+ struct css_driver *drv;
+
+ if (mutex_is_locked(&sch->reg_mutex))
+ return -EAGAIN;
+ if (!sch->dev.driver)
+ return 0;
+ drv = to_cssdriver(sch->dev.driver);
+ /* Notify drivers that they may not register children. */
+ return drv->prepare ? drv->prepare(sch) : 0;
+}
+
+static void css_pm_complete(struct device *dev)
+{
+ struct subchannel *sch = to_subchannel(dev);
+ struct css_driver *drv;
+
+ if (!sch->dev.driver)
+ return;
+ drv = to_cssdriver(sch->dev.driver);
+ if (drv->complete)
+ drv->complete(sch);
+}
+
+static int css_pm_freeze(struct device *dev)
+{
+ struct subchannel *sch = to_subchannel(dev);
+ struct css_driver *drv;
+
+ if (!sch->dev.driver)
+ return 0;
+ drv = to_cssdriver(sch->dev.driver);
+ return drv->freeze ? drv->freeze(sch) : 0;
+}
+
+static int css_pm_thaw(struct device *dev)
+{
+ struct subchannel *sch = to_subchannel(dev);
+ struct css_driver *drv;
+
+ if (!sch->dev.driver)
+ return 0;
+ drv = to_cssdriver(sch->dev.driver);
+ return drv->thaw ? drv->thaw(sch) : 0;
+}
+
+static int css_pm_restore(struct device *dev)
+{
+ struct subchannel *sch = to_subchannel(dev);
+ struct css_driver *drv;
+
+ if (!sch->dev.driver)
+ return 0;
+ drv = to_cssdriver(sch->dev.driver);
+ return drv->restore ? drv->restore(sch) : 0;
+}
+
+static struct dev_pm_ops css_pm_ops = {
+ .prepare = css_pm_prepare,
+ .complete = css_pm_complete,
+ .freeze = css_pm_freeze,
+ .thaw = css_pm_thaw,
+ .restore = css_pm_restore,
+};
+
struct bus_type css_bus_type = {
.name = "css",
.match = css_bus_match,
@@ -960,6 +1106,7 @@ struct bus_type css_bus_type = {
.remove = css_remove,
.shutdown = css_shutdown,
.uevent = css_uevent,
+ .pm = &css_pm_ops,
};
/**