[S390] ap/zcrypt: Suspend/Resume ap bus and zcrypt
Add Suspend/Resume support to ap bus and zcrypt. All enhancements are
done in the ap bus. No changes in the crypto card specific part are
necessary.
Signed-off-by: Felix Beck <felix.beck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/drivers/s390/crypto/ap_bus.c b/drivers/s390/crypto/ap_bus.c
index 9c14840..727a809 100644
--- a/drivers/s390/crypto/ap_bus.c
+++ b/drivers/s390/crypto/ap_bus.c
@@ -54,6 +54,12 @@
static void ap_poll_thread_stop(void);
static void ap_request_timeout(unsigned long);
static inline void ap_schedule_poll_timer(void);
+static int __ap_poll_device(struct ap_device *ap_dev, unsigned long *flags);
+static int ap_device_remove(struct device *dev);
+static int ap_device_probe(struct device *dev);
+static void ap_interrupt_handler(void *unused1, void *unused2);
+static void ap_reset(struct ap_device *ap_dev);
+static void ap_config_timeout(unsigned long ptr);
/*
* Module description.
@@ -101,6 +107,10 @@
* If z/VM change to 1500000 nanoseconds to adjust to z/VM polling.*/
static unsigned long long poll_timeout = 250000;
+/* Suspend flag */
+static int ap_suspend_flag;
+static struct bus_type ap_bus_type;
+
/**
* ap_using_interrupts() - Returns non-zero if interrupt support is
* available.
@@ -617,10 +627,79 @@
return retval;
}
+static int ap_bus_suspend(struct device *dev, pm_message_t state)
+{
+ struct ap_device *ap_dev = to_ap_dev(dev);
+ unsigned long flags;
+
+ if (!ap_suspend_flag) {
+ ap_suspend_flag = 1;
+
+ /* Disable scanning for devices, thus we do not want to scan
+ * for them after removing.
+ */
+ del_timer_sync(&ap_config_timer);
+ if (ap_work_queue != NULL) {
+ destroy_workqueue(ap_work_queue);
+ ap_work_queue = NULL;
+ }
+ tasklet_disable(&ap_tasklet);
+ }
+ /* Poll on the device until all requests are finished. */
+ do {
+ flags = 0;
+ __ap_poll_device(ap_dev, &flags);
+ } while ((flags & 1) || (flags & 2));
+
+ ap_device_remove(dev);
+ return 0;
+}
+
+static int ap_bus_resume(struct device *dev)
+{
+ int rc = 0;
+ struct ap_device *ap_dev = to_ap_dev(dev);
+
+ if (ap_suspend_flag) {
+ ap_suspend_flag = 0;
+ if (!ap_interrupts_available())
+ ap_interrupt_indicator = NULL;
+ ap_device_probe(dev);
+ ap_reset(ap_dev);
+ setup_timer(&ap_dev->timeout, ap_request_timeout,
+ (unsigned long) ap_dev);
+ ap_scan_bus(NULL);
+ init_timer(&ap_config_timer);
+ ap_config_timer.function = ap_config_timeout;
+ ap_config_timer.data = 0;
+ ap_config_timer.expires = jiffies + ap_config_time * HZ;
+ add_timer(&ap_config_timer);
+ ap_work_queue = create_singlethread_workqueue("kapwork");
+ if (!ap_work_queue)
+ return -ENOMEM;
+ tasklet_enable(&ap_tasklet);
+ if (!ap_using_interrupts())
+ ap_schedule_poll_timer();
+ else
+ tasklet_schedule(&ap_tasklet);
+ if (ap_thread_flag)
+ rc = ap_poll_thread_start();
+ } else {
+ ap_device_probe(dev);
+ ap_reset(ap_dev);
+ setup_timer(&ap_dev->timeout, ap_request_timeout,
+ (unsigned long) ap_dev);
+ }
+
+ return rc;
+}
+
static struct bus_type ap_bus_type = {
.name = "ap",
.match = &ap_bus_match,
.uevent = &ap_uevent,
+ .suspend = ap_bus_suspend,
+ .resume = ap_bus_resume
};
static int ap_device_probe(struct device *dev)
@@ -1066,7 +1145,7 @@
*/
static inline void ap_schedule_poll_timer(void)
{
- if (ap_using_interrupts())
+ if (ap_using_interrupts() || ap_suspend_flag)
return;
if (hrtimer_is_queued(&ap_poll_timer))
return;
@@ -1384,6 +1463,8 @@
set_user_nice(current, 19);
while (1) {
+ if (ap_suspend_flag)
+ return 0;
if (need_resched()) {
schedule();
continue;
@@ -1414,7 +1495,7 @@
{
int rc;
- if (ap_using_interrupts())
+ if (ap_using_interrupts() || ap_suspend_flag)
return 0;
mutex_lock(&ap_poll_thread_mutex);
if (!ap_poll_kthread) {
