#include <linux/notifier.h>
#include <linux/smp.h>
#include <linux/sysdev.h>
+#include <linux/tick.h>
/* The registered clock event devices */
static LIST_HEAD(clockevent_devices);
{
u64 clc = ((u64) latch << evt->shift);
+ if (unlikely(!evt->mult)) {
+ evt->mult = 1;
+ WARN_ON(1);
+ }
+
do_div(clc, evt->mult);
if (clc < 1000)
clc = 1000;
return (unsigned long) clc;
}
+EXPORT_SYMBOL_GPL(clockevent_delta2ns);
/**
* clockevents_set_mode - set the operating mode of a clock event device
if (dev->mode != mode) {
dev->set_mode(mode, dev);
dev->mode = mode;
+
+ /*
+ * A nsec2cyc multiplicator of 0 is invalid and we'd crash
+ * on it, so fix it up and emit a warning:
+ */
+ if (mode == CLOCK_EVT_MODE_ONESHOT) {
+ if (unlikely(!dev->mult)) {
+ dev->mult = 1;
+ WARN_ON(1);
+ }
+ }
}
}
/**
+ * clockevents_shutdown - shutdown the device and clear next_event
+ * @dev: device to shutdown
+ */
+void clockevents_shutdown(struct clock_event_device *dev)
+{
+ clockevents_set_mode(dev, CLOCK_EVT_MODE_SHUTDOWN);
+ dev->next_event.tv64 = KTIME_MAX;
+}
+
+/**
* clockevents_program_event - Reprogram the clock event device.
* @expires: absolute expiry time (monotonic clock)
*
unsigned long long clc;
int64_t delta;
+ if (unlikely(expires.tv64 < 0)) {
+ WARN_ON_ONCE(1);
+ return -ETIME;
+ }
+
delta = ktime_to_ns(ktime_sub(expires, now));
if (delta <= 0)
return ret;
}
-/**
- * clockevents_unregister_notifier - unregister a clock events change listener
- */
-void clockevents_unregister_notifier(struct notifier_block *nb)
-{
- spin_lock(&clockevents_lock);
- raw_notifier_chain_unregister(&clockevents_chain, nb);
- spin_unlock(&clockevents_lock);
-}
-
/*
* Notify about a clock event change. Called with clockevents_lock
* held.
}
/*
- * Called after a notify add to make devices availble which were
+ * Called after a notify add to make devices available which were
* released from the notifier call.
*/
static void clockevents_notify_released(void)
void clockevents_register_device(struct clock_event_device *dev)
{
BUG_ON(dev->mode != CLOCK_EVT_MODE_UNUSED);
+ BUG_ON(!dev->cpumask);
spin_lock(&clockevents_lock);
spin_unlock(&clockevents_lock);
}
+EXPORT_SYMBOL_GPL(clockevents_register_device);
/*
* Noop handler when we shut down an event device
*/
-static void clockevents_handle_noop(struct clock_event_device *dev)
+void clockevents_handle_noop(struct clock_event_device *dev)
{
}
* released list and do a notify add later.
*/
if (old) {
- old->event_handler = clockevents_handle_noop;
clockevents_set_mode(old, CLOCK_EVT_MODE_UNUSED);
list_del(&old->list);
list_add(&old->list, &clockevents_released);
if (new) {
BUG_ON(new->mode != CLOCK_EVT_MODE_UNUSED);
- clockevents_set_mode(new, CLOCK_EVT_MODE_SHUTDOWN);
+ clockevents_shutdown(new);
}
local_irq_restore(flags);
}
-/**
- * clockevents_request_device
- */
-struct clock_event_device *clockevents_request_device(unsigned int features,
- cpumask_t cpumask)
-{
- struct clock_event_device *cur, *dev = NULL;
- struct list_head *tmp;
-
- spin_lock(&clockevents_lock);
-
- list_for_each(tmp, &clockevent_devices) {
- cur = list_entry(tmp, struct clock_event_device, list);
-
- if ((cur->features & features) == features &&
- cpus_equal(cpumask, cur->cpumask)) {
- if (!dev || dev->rating < cur->rating)
- dev = cur;
- }
- }
-
- clockevents_exchange_device(NULL, dev);
-
- spin_unlock(&clockevents_lock);
-
- return dev;
-}
-
-/**
- * clockevents_release_device
- */
-void clockevents_release_device(struct clock_event_device *dev)
-{
- spin_lock(&clockevents_lock);
-
- clockevents_exchange_device(dev, NULL);
- clockevents_notify_released();
-
- spin_unlock(&clockevents_lock);
-}
-
+#ifdef CONFIG_GENERIC_CLOCKEVENTS
/**
* clockevents_notify - notification about relevant events
*/
void clockevents_notify(unsigned long reason, void *arg)
{
+ struct list_head *node, *tmp;
+
spin_lock(&clockevents_lock);
clockevents_do_notify(reason, arg);
* Unregister the clock event devices which were
* released from the users in the notify chain.
*/
- while (!list_empty(&clockevents_released)) {
- struct clock_event_device *dev;
-
- dev = list_entry(clockevents_released.next,
- struct clock_event_device, list);
- list_del(&dev->list);
- }
+ list_for_each_safe(node, tmp, &clockevents_released)
+ list_del(node);
break;
default:
break;
spin_unlock(&clockevents_lock);
}
EXPORT_SYMBOL_GPL(clockevents_notify);
-
-#ifdef CONFIG_SYSFS
-
-/**
- * clockevents_show_registered - sysfs interface for listing clockevents
- * @dev: unused
- * @buf: char buffer to be filled with clock events list
- *
- * Provides sysfs interface for listing registered clock event devices
- */
-static ssize_t clockevents_show_registered(struct sys_device *dev, char *buf)
-{
- struct list_head *tmp;
- char *p = buf;
- int cpu;
-
- spin_lock(&clockevents_lock);
-
- list_for_each(tmp, &clockevent_devices) {
- struct clock_event_device *ce;
-
- ce = list_entry(tmp, struct clock_event_device, list);
- p += sprintf(p, "%-20s F:%04x M:%d", ce->name,
- ce->features, ce->mode);
- p += sprintf(p, " C:");
- if (!cpus_equal(ce->cpumask, cpu_possible_map)) {
- for_each_cpu_mask(cpu, ce->cpumask)
- p += sprintf(p, " %d", cpu);
- } else {
- /*
- * FIXME: Add the cpu which is handling this sucker
- */
- }
- p += sprintf(p, "\n");
- }
-
- spin_unlock(&clockevents_lock);
-
- return p - buf;
-}
-
-/*
- * Sysfs setup bits:
- */
-static SYSDEV_ATTR(registered, 0600,
- clockevents_show_registered, NULL);
-
-static struct sysdev_class clockevents_sysclass = {
- set_kset_name("clockevents"),
-};
-
-static struct sys_device clockevents_sys_device = {
- .id = 0,
- .cls = &clockevents_sysclass,
-};
-
-static int __init clockevents_sysfs_init(void)
-{
- int error = sysdev_class_register(&clockevents_sysclass);
-
- if (!error)
- error = sysdev_register(&clockevents_sys_device);
- if (!error)
- error = sysdev_create_file(
- &clockevents_sys_device,
- &attr_registered);
- return error;
-}
-device_initcall(clockevents_sysfs_init);
#endif
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