[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit
Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/os/linux/linux-3.4.x/kernel/time/tick-broadcast.c b/ap/os/linux/linux-3.4.x/kernel/time/tick-broadcast.c
new file mode 100644
index 0000000..f8961bf
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/kernel/time/tick-broadcast.c
@@ -0,0 +1,642 @@
+/*
+ * linux/kernel/time/tick-broadcast.c
+ *
+ * This file contains functions which emulate a local clock-event
+ * device via a broadcast event source.
+ *
+ * Copyright(C) 2005-2006, Thomas Gleixner <tglx@linutronix.de>
+ * Copyright(C) 2005-2007, Red Hat, Inc., Ingo Molnar
+ * Copyright(C) 2006-2007, Timesys Corp., Thomas Gleixner
+ *
+ * This code is licenced under the GPL version 2. For details see
+ * kernel-base/COPYING.
+ */
+#include <linux/cpu.h>
+#include <linux/err.h>
+#include <linux/hrtimer.h>
+#include <linux/interrupt.h>
+#include <linux/percpu.h>
+#include <linux/profile.h>
+#include <linux/sched.h>
+
+#include "tick-internal.h"
+
+/*
+ * Broadcast support for broken x86 hardware, where the local apic
+ * timer stops in C3 state.
+ */
+
+static struct tick_device tick_broadcast_device;
+/* FIXME: Use cpumask_var_t. */
+static DECLARE_BITMAP(tick_broadcast_mask, NR_CPUS);
+static DECLARE_BITMAP(tmpmask, NR_CPUS);
+static DEFINE_RAW_SPINLOCK(tick_broadcast_lock);
+static int tick_broadcast_force;
+
+#ifdef CONFIG_TICK_ONESHOT
+static void tick_broadcast_clear_oneshot(int cpu);
+#else
+static inline void tick_broadcast_clear_oneshot(int cpu) { }
+#endif
+
+/*
+ * Debugging: see timer_list.c
+ */
+struct tick_device *tick_get_broadcast_device(void)
+{
+ return &tick_broadcast_device;
+}
+
+struct cpumask *tick_get_broadcast_mask(void)
+{
+ return to_cpumask(tick_broadcast_mask);
+}
+
+/*
+ * Start the device in periodic mode
+ */
+static void tick_broadcast_start_periodic(struct clock_event_device *bc)
+{
+ if (bc)
+ tick_setup_periodic(bc, 1);
+}
+
+/*
+ * Check, if the device can be utilized as broadcast device:
+ */
+int tick_check_broadcast_device(struct clock_event_device *dev)
+{
+ struct clock_event_device *cur = tick_broadcast_device.evtdev;
+
+ if ((dev->features & CLOCK_EVT_FEAT_DUMMY) ||
+ (tick_broadcast_device.evtdev &&
+ tick_broadcast_device.evtdev->rating >= dev->rating) ||
+ (dev->features & CLOCK_EVT_FEAT_C3STOP))
+ return 0;
+
+ clockevents_exchange_device(tick_broadcast_device.evtdev, dev);
+ if (cur)
+ cur->event_handler = clockevents_handle_noop;
+ tick_broadcast_device.evtdev = dev;
+ if (!cpumask_empty(tick_get_broadcast_mask()))
+ tick_broadcast_start_periodic(dev);
+ return 1;
+}
+
+/*
+ * Check, if the device is the broadcast device
+ */
+int tick_is_broadcast_device(struct clock_event_device *dev)
+{
+ return (dev && tick_broadcast_device.evtdev == dev);
+}
+
+/*
+ * Check, if the device is disfunctional and a place holder, which
+ * needs to be handled by the broadcast device.
+ */
+int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu)
+{
+ unsigned long flags;
+ int ret = 0;
+
+ raw_spin_lock_irqsave(&tick_broadcast_lock, flags);
+
+ /*
+ * Devices might be registered with both periodic and oneshot
+ * mode disabled. This signals, that the device needs to be
+ * operated from the broadcast device and is a placeholder for
+ * the cpu local device.
+ */
+ if (!tick_device_is_functional(dev)) {
+ dev->event_handler = tick_handle_periodic;
+ cpumask_set_cpu(cpu, tick_get_broadcast_mask());
+ tick_broadcast_start_periodic(tick_broadcast_device.evtdev);
+ ret = 1;
+ } else {
+ /*
+ * When the new device is not affected by the stop
+ * feature and the cpu is marked in the broadcast mask
+ * then clear the broadcast bit.
+ */
+ if (!(dev->features & CLOCK_EVT_FEAT_C3STOP)) {
+ int cpu = smp_processor_id();
+
+ cpumask_clear_cpu(cpu, tick_get_broadcast_mask());
+ tick_broadcast_clear_oneshot(cpu);
+ }
+ }
+ raw_spin_unlock_irqrestore(&tick_broadcast_lock, flags);
+ return ret;
+}
+
+/*
+ * Broadcast the event to the cpus, which are set in the mask (mangled).
+ */
+static void tick_do_broadcast(struct cpumask *mask)
+{
+ int cpu = smp_processor_id();
+ struct tick_device *td;
+
+ /*
+ * Check, if the current cpu is in the mask
+ */
+ if (cpumask_test_cpu(cpu, mask)) {
+ cpumask_clear_cpu(cpu, mask);
+ td = &per_cpu(tick_cpu_device, cpu);
+ td->evtdev->event_handler(td->evtdev);
+ }
+
+ if (!cpumask_empty(mask)) {
+ /*
+ * It might be necessary to actually check whether the devices
+ * have different broadcast functions. For now, just use the
+ * one of the first device. This works as long as we have this
+ * misfeature only on x86 (lapic)
+ */
+ td = &per_cpu(tick_cpu_device, cpumask_first(mask));
+ td->evtdev->broadcast(mask);
+ }
+}
+
+/*
+ * Periodic broadcast:
+ * - invoke the broadcast handlers
+ */
+static void tick_do_periodic_broadcast(void)
+{
+ raw_spin_lock(&tick_broadcast_lock);
+
+ cpumask_and(to_cpumask(tmpmask),
+ cpu_online_mask, tick_get_broadcast_mask());
+ tick_do_broadcast(to_cpumask(tmpmask));
+
+ raw_spin_unlock(&tick_broadcast_lock);
+}
+
+/*
+ * Event handler for periodic broadcast ticks
+ */
+static void tick_handle_periodic_broadcast(struct clock_event_device *dev)
+{
+ ktime_t next;
+
+ tick_do_periodic_broadcast();
+
+ /*
+ * The device is in periodic mode. No reprogramming necessary:
+ */
+ if (dev->mode == CLOCK_EVT_MODE_PERIODIC)
+ return;
+
+ /*
+ * Setup the next period for devices, which do not have
+ * periodic mode. We read dev->next_event first and add to it
+ * when the event already expired. clockevents_program_event()
+ * sets dev->next_event only when the event is really
+ * programmed to the device.
+ */
+ for (next = dev->next_event; ;) {
+ next = ktime_add(next, tick_period);
+
+ if (!clockevents_program_event(dev, next, false))
+ return;
+ tick_do_periodic_broadcast();
+ }
+}
+
+/*
+ * Powerstate information: The system enters/leaves a state, where
+ * affected devices might stop
+ */
+static void tick_do_broadcast_on_off(unsigned long *reason)
+{
+ struct clock_event_device *bc, *dev;
+ struct tick_device *td;
+ unsigned long flags;
+ int cpu, bc_stopped;
+
+ raw_spin_lock_irqsave(&tick_broadcast_lock, flags);
+
+ cpu = smp_processor_id();
+ td = &per_cpu(tick_cpu_device, cpu);
+ dev = td->evtdev;
+ bc = tick_broadcast_device.evtdev;
+
+ /*
+ * Is the device not affected by the powerstate ?
+ */
+ if (!dev || !(dev->features & CLOCK_EVT_FEAT_C3STOP))
+ goto out;
+
+ if (!tick_device_is_functional(dev))
+ goto out;
+
+ bc_stopped = cpumask_empty(tick_get_broadcast_mask());
+
+ switch (*reason) {
+ case CLOCK_EVT_NOTIFY_BROADCAST_ON:
+ case CLOCK_EVT_NOTIFY_BROADCAST_FORCE:
+ if (!cpumask_test_cpu(cpu, tick_get_broadcast_mask())) {
+ cpumask_set_cpu(cpu, tick_get_broadcast_mask());
+ if (tick_broadcast_device.mode ==
+ TICKDEV_MODE_PERIODIC)
+ clockevents_shutdown(dev);
+ }
+ if (*reason == CLOCK_EVT_NOTIFY_BROADCAST_FORCE)
+ tick_broadcast_force = 1;
+ break;
+ case CLOCK_EVT_NOTIFY_BROADCAST_OFF:
+ if (!tick_broadcast_force &&
+ cpumask_test_cpu(cpu, tick_get_broadcast_mask())) {
+ cpumask_clear_cpu(cpu, tick_get_broadcast_mask());
+ if (tick_broadcast_device.mode ==
+ TICKDEV_MODE_PERIODIC)
+ tick_setup_periodic(dev, 0);
+ }
+ break;
+ }
+
+ if (cpumask_empty(tick_get_broadcast_mask())) {
+ if (!bc_stopped)
+ clockevents_shutdown(bc);
+ } else if (bc_stopped) {
+ if (tick_broadcast_device.mode == TICKDEV_MODE_PERIODIC)
+ tick_broadcast_start_periodic(bc);
+ else
+ tick_broadcast_setup_oneshot(bc);
+ }
+out:
+ raw_spin_unlock_irqrestore(&tick_broadcast_lock, flags);
+}
+
+/*
+ * Powerstate information: The system enters/leaves a state, where
+ * affected devices might stop.
+ */
+void tick_broadcast_on_off(unsigned long reason, int *oncpu)
+{
+ if (!cpumask_test_cpu(*oncpu, cpu_online_mask))
+ printk(KERN_ERR "tick-broadcast: ignoring broadcast for "
+ "offline CPU #%d\n", *oncpu);
+ else
+ tick_do_broadcast_on_off(&reason);
+}
+
+/*
+ * Set the periodic handler depending on broadcast on/off
+ */
+void tick_set_periodic_handler(struct clock_event_device *dev, int broadcast)
+{
+ if (!broadcast)
+ dev->event_handler = tick_handle_periodic;
+ else
+ dev->event_handler = tick_handle_periodic_broadcast;
+}
+
+/*
+ * Remove a CPU from broadcasting
+ */
+void tick_shutdown_broadcast(unsigned int *cpup)
+{
+ struct clock_event_device *bc;
+ unsigned long flags;
+ unsigned int cpu = *cpup;
+
+ raw_spin_lock_irqsave(&tick_broadcast_lock, flags);
+
+ bc = tick_broadcast_device.evtdev;
+ cpumask_clear_cpu(cpu, tick_get_broadcast_mask());
+
+ if (tick_broadcast_device.mode == TICKDEV_MODE_PERIODIC) {
+ if (bc && cpumask_empty(tick_get_broadcast_mask()))
+ clockevents_shutdown(bc);
+ }
+
+ raw_spin_unlock_irqrestore(&tick_broadcast_lock, flags);
+}
+
+void tick_suspend_broadcast(void)
+{
+ struct clock_event_device *bc;
+ unsigned long flags;
+
+ raw_spin_lock_irqsave(&tick_broadcast_lock, flags);
+
+ bc = tick_broadcast_device.evtdev;
+ if (bc)
+ clockevents_shutdown(bc);
+
+ raw_spin_unlock_irqrestore(&tick_broadcast_lock, flags);
+}
+
+int tick_resume_broadcast(void)
+{
+ struct clock_event_device *bc;
+ unsigned long flags;
+ int broadcast = 0;
+
+ raw_spin_lock_irqsave(&tick_broadcast_lock, flags);
+
+ bc = tick_broadcast_device.evtdev;
+
+ if (bc) {
+ clockevents_set_mode(bc, CLOCK_EVT_MODE_RESUME);
+
+ switch (tick_broadcast_device.mode) {
+ case TICKDEV_MODE_PERIODIC:
+ if (!cpumask_empty(tick_get_broadcast_mask()))
+ tick_broadcast_start_periodic(bc);
+ broadcast = cpumask_test_cpu(smp_processor_id(),
+ tick_get_broadcast_mask());
+ break;
+ case TICKDEV_MODE_ONESHOT:
+ if (!cpumask_empty(tick_get_broadcast_mask()))
+ broadcast = tick_resume_broadcast_oneshot(bc);
+ break;
+ }
+ }
+ raw_spin_unlock_irqrestore(&tick_broadcast_lock, flags);
+
+ return broadcast;
+}
+
+
+#ifdef CONFIG_TICK_ONESHOT
+
+/* FIXME: use cpumask_var_t. */
+static DECLARE_BITMAP(tick_broadcast_oneshot_mask, NR_CPUS);
+
+/*
+ * Exposed for debugging: see timer_list.c
+ */
+struct cpumask *tick_get_broadcast_oneshot_mask(void)
+{
+ return to_cpumask(tick_broadcast_oneshot_mask);
+}
+
+static int tick_broadcast_set_event(ktime_t expires, int force)
+{
+ struct clock_event_device *bc = tick_broadcast_device.evtdev;
+
+ if (bc->mode != CLOCK_EVT_MODE_ONESHOT)
+ clockevents_set_mode(bc, CLOCK_EVT_MODE_ONESHOT);
+
+ return clockevents_program_event(bc, expires, force);
+}
+
+int tick_resume_broadcast_oneshot(struct clock_event_device *bc)
+{
+ clockevents_set_mode(bc, CLOCK_EVT_MODE_ONESHOT);
+ return 0;
+}
+
+/*
+ * Called from irq_enter() when idle was interrupted to reenable the
+ * per cpu device.
+ */
+void tick_check_oneshot_broadcast(int cpu)
+{
+ if (cpumask_test_cpu(cpu, to_cpumask(tick_broadcast_oneshot_mask))) {
+ struct tick_device *td = &per_cpu(tick_cpu_device, cpu);
+
+ /*
+ * We might be in the middle of switching over from
+ * periodic to oneshot. If the CPU has not yet
+ * switched over, leave the device alone.
+ */
+ if (td->mode == TICKDEV_MODE_ONESHOT) {
+ clockevents_set_mode(td->evtdev,
+ CLOCK_EVT_MODE_ONESHOT);
+ }
+ }
+}
+
+/*
+ * Handle oneshot mode broadcasting
+ */
+static void tick_handle_oneshot_broadcast(struct clock_event_device *dev)
+{
+ struct tick_device *td;
+ ktime_t now, next_event;
+ int cpu;
+
+ raw_spin_lock(&tick_broadcast_lock);
+again:
+ dev->next_event.tv64 = KTIME_MAX;
+ next_event.tv64 = KTIME_MAX;
+ cpumask_clear(to_cpumask(tmpmask));
+ now = ktime_get();
+ /* Find all expired events */
+ for_each_cpu(cpu, tick_get_broadcast_oneshot_mask()) {
+ td = &per_cpu(tick_cpu_device, cpu);
+ if (td->evtdev->next_event.tv64 <= now.tv64)
+ cpumask_set_cpu(cpu, to_cpumask(tmpmask));
+ else if (td->evtdev->next_event.tv64 < next_event.tv64)
+ next_event.tv64 = td->evtdev->next_event.tv64;
+ }
+
+ /*
+ * Wakeup the cpus which have an expired event.
+ */
+ tick_do_broadcast(to_cpumask(tmpmask));
+
+ /*
+ * Two reasons for reprogram:
+ *
+ * - The global event did not expire any CPU local
+ * events. This happens in dyntick mode, as the maximum PIT
+ * delta is quite small.
+ *
+ * - There are pending events on sleeping CPUs which were not
+ * in the event mask
+ */
+ if (next_event.tv64 != KTIME_MAX) {
+ /*
+ * Rearm the broadcast device. If event expired,
+ * repeat the above
+ */
+ if (tick_broadcast_set_event(next_event, 0))
+ goto again;
+ }
+ raw_spin_unlock(&tick_broadcast_lock);
+}
+
+/*
+ * Powerstate information: The system enters/leaves a state, where
+ * affected devices might stop
+ */
+void tick_broadcast_oneshot_control(unsigned long reason)
+{
+ struct clock_event_device *bc, *dev;
+ struct tick_device *td;
+ unsigned long flags;
+ int cpu;
+
+ /*
+ * Periodic mode does not care about the enter/exit of power
+ * states
+ */
+ if (tick_broadcast_device.mode == TICKDEV_MODE_PERIODIC)
+ return;
+
+ /*
+ * We are called with preemtion disabled from the depth of the
+ * idle code, so we can't be moved away.
+ */
+ cpu = smp_processor_id();
+ td = &per_cpu(tick_cpu_device, cpu);
+ dev = td->evtdev;
+
+ if (!(dev->features & CLOCK_EVT_FEAT_C3STOP))
+ return;
+
+ bc = tick_broadcast_device.evtdev;
+
+ raw_spin_lock_irqsave(&tick_broadcast_lock, flags);
+ if (reason == CLOCK_EVT_NOTIFY_BROADCAST_ENTER) {
+ if (!cpumask_test_cpu(cpu, tick_get_broadcast_oneshot_mask())) {
+ cpumask_set_cpu(cpu, tick_get_broadcast_oneshot_mask());
+ clockevents_set_mode(dev, CLOCK_EVT_MODE_SHUTDOWN);
+ if (dev->next_event.tv64 < bc->next_event.tv64)
+ tick_broadcast_set_event(dev->next_event, 1);
+ }
+ } else {
+ if (cpumask_test_cpu(cpu, tick_get_broadcast_oneshot_mask())) {
+ cpumask_clear_cpu(cpu,
+ tick_get_broadcast_oneshot_mask());
+ clockevents_set_mode(dev, CLOCK_EVT_MODE_ONESHOT);
+ if (dev->next_event.tv64 != KTIME_MAX)
+ tick_program_event(dev->next_event, 1);
+ }
+ }
+ raw_spin_unlock_irqrestore(&tick_broadcast_lock, flags);
+}
+
+/*
+ * Reset the one shot broadcast for a cpu
+ *
+ * Called with tick_broadcast_lock held
+ */
+static void tick_broadcast_clear_oneshot(int cpu)
+{
+ cpumask_clear_cpu(cpu, tick_get_broadcast_oneshot_mask());
+}
+
+static void tick_broadcast_init_next_event(struct cpumask *mask,
+ ktime_t expires)
+{
+ struct tick_device *td;
+ int cpu;
+
+ for_each_cpu(cpu, mask) {
+ td = &per_cpu(tick_cpu_device, cpu);
+ if (td->evtdev)
+ td->evtdev->next_event = expires;
+ }
+}
+
+/**
+ * tick_broadcast_setup_oneshot - setup the broadcast device
+ */
+void tick_broadcast_setup_oneshot(struct clock_event_device *bc)
+{
+ int cpu = smp_processor_id();
+
+ /* Set it up only once ! */
+ if (bc->event_handler != tick_handle_oneshot_broadcast) {
+ int was_periodic = bc->mode == CLOCK_EVT_MODE_PERIODIC;
+
+ bc->event_handler = tick_handle_oneshot_broadcast;
+
+ /* Take the do_timer update */
+ tick_do_timer_cpu = cpu;
+
+ /*
+ * We must be careful here. There might be other CPUs
+ * waiting for periodic broadcast. We need to set the
+ * oneshot_mask bits for those and program the
+ * broadcast device to fire.
+ */
+ cpumask_copy(to_cpumask(tmpmask), tick_get_broadcast_mask());
+ cpumask_clear_cpu(cpu, to_cpumask(tmpmask));
+ cpumask_or(tick_get_broadcast_oneshot_mask(),
+ tick_get_broadcast_oneshot_mask(),
+ to_cpumask(tmpmask));
+
+ if (was_periodic && !cpumask_empty(to_cpumask(tmpmask))) {
+ clockevents_set_mode(bc, CLOCK_EVT_MODE_ONESHOT);
+ tick_broadcast_init_next_event(to_cpumask(tmpmask),
+ tick_next_period);
+ tick_broadcast_set_event(tick_next_period, 1);
+ } else
+ bc->next_event.tv64 = KTIME_MAX;
+ } else {
+ /*
+ * The first cpu which switches to oneshot mode sets
+ * the bit for all other cpus which are in the general
+ * (periodic) broadcast mask. So the bit is set and
+ * would prevent the first broadcast enter after this
+ * to program the bc device.
+ */
+ tick_broadcast_clear_oneshot(cpu);
+ }
+}
+
+/*
+ * Select oneshot operating mode for the broadcast device
+ */
+void tick_broadcast_switch_to_oneshot(void)
+{
+ struct clock_event_device *bc;
+ unsigned long flags;
+
+ raw_spin_lock_irqsave(&tick_broadcast_lock, flags);
+
+ tick_broadcast_device.mode = TICKDEV_MODE_ONESHOT;
+ bc = tick_broadcast_device.evtdev;
+ if (bc)
+ tick_broadcast_setup_oneshot(bc);
+
+ raw_spin_unlock_irqrestore(&tick_broadcast_lock, flags);
+}
+
+
+/*
+ * Remove a dead CPU from broadcasting
+ */
+void tick_shutdown_broadcast_oneshot(unsigned int *cpup)
+{
+ unsigned long flags;
+ unsigned int cpu = *cpup;
+
+ raw_spin_lock_irqsave(&tick_broadcast_lock, flags);
+
+ /*
+ * Clear the broadcast mask flag for the dead cpu, but do not
+ * stop the broadcast device!
+ */
+ cpumask_clear_cpu(cpu, tick_get_broadcast_oneshot_mask());
+
+ raw_spin_unlock_irqrestore(&tick_broadcast_lock, flags);
+}
+
+/*
+ * Check, whether the broadcast device is in one shot mode
+ */
+int tick_broadcast_oneshot_active(void)
+{
+ return tick_broadcast_device.mode == TICKDEV_MODE_ONESHOT;
+}
+
+/*
+ * Check whether the broadcast device supports oneshot.
+ */
+bool tick_broadcast_oneshot_available(void)
+{
+ struct clock_event_device *bc = tick_broadcast_device.evtdev;
+
+ return bc ? bc->features & CLOCK_EVT_FEAT_ONESHOT : false;
+}
+
+#endif