Moved, renamed, and deleted files

The original directory structure was scattered and unorganized.
Changes are basically to make it look like kernel structure.

1 files changed, 504 insertions, 0 deletions

diff --git a/arch/s390/kernel/vtime.c b/arch/s390/kernel/vtime.c
new file mode 100644
index 00000000..39ebff50
--- /dev/null
+++ b/arch/s390/kernel/vtime.c
@@ -0,0 +1,504 @@
+/*
+ *  arch/s390/kernel/vtime.c
+ *    Virtual cpu timer based timer functions.
+ *
+ *  S390 version
+ *    Copyright (C) 2004 IBM Deutschland Entwicklung GmbH, IBM Corporation
+ *    Author(s): Jan Glauber <jan.glauber@de.ibm.com>
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/time.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/smp.h>
+#include <linux/types.h>
+#include <linux/timex.h>
+#include <linux/notifier.h>
+#include <linux/kernel_stat.h>
+#include <linux/rcupdate.h>
+#include <linux/posix-timers.h>
+#include <linux/cpu.h>
+#include <linux/kprobes.h>
+
+#include <asm/timer.h>
+#include <asm/irq_regs.h>
+#include <asm/cputime.h>
+#include <asm/irq.h>
+#include "entry.h"
+
+static DEFINE_PER_CPU(struct vtimer_queue, virt_cpu_timer);
+
+DEFINE_PER_CPU(struct s390_idle_data, s390_idle);
+
+static inline __u64 get_vtimer(void)
+{
+	__u64 timer;
+
+	asm volatile("STPT %0" : "=m" (timer));
+	return timer;
+}
+
+static inline void set_vtimer(__u64 expires)
+{
+	__u64 timer;
+
+	asm volatile ("  STPT %0\n"  /* Store current cpu timer value */
+		      "  SPT %1"     /* Set new value immediately afterwards */
+		      : "=m" (timer) : "m" (expires) );
+	S390_lowcore.system_timer += S390_lowcore.last_update_timer - timer;
+	S390_lowcore.last_update_timer = expires;
+}
+
+/*
+ * Update process times based on virtual cpu times stored by entry.S
+ * to the lowcore fields user_timer, system_timer & steal_clock.
+ */
+static void do_account_vtime(struct task_struct *tsk, int hardirq_offset)
+{
+	struct thread_info *ti = task_thread_info(tsk);
+	__u64 timer, clock, user, system, steal;
+
+	timer = S390_lowcore.last_update_timer;
+	clock = S390_lowcore.last_update_clock;
+	asm volatile ("  STPT %0\n"    /* Store current cpu timer value */
+		      "  STCK %1"      /* Store current tod clock value */
+		      : "=m" (S390_lowcore.last_update_timer),
+		        "=m" (S390_lowcore.last_update_clock) );
+	S390_lowcore.system_timer += timer - S390_lowcore.last_update_timer;
+	S390_lowcore.steal_timer += S390_lowcore.last_update_clock - clock;
+
+	user = S390_lowcore.user_timer - ti->user_timer;
+	S390_lowcore.steal_timer -= user;
+	ti->user_timer = S390_lowcore.user_timer;
+	account_user_time(tsk, user, user);
+
+	system = S390_lowcore.system_timer - ti->system_timer;
+	S390_lowcore.steal_timer -= system;
+	ti->system_timer = S390_lowcore.system_timer;
+	account_system_time(tsk, hardirq_offset, system, system);
+
+	steal = S390_lowcore.steal_timer;
+	if ((s64) steal > 0) {
+		S390_lowcore.steal_timer = 0;
+		account_steal_time(steal);
+	}
+}
+
+void account_vtime(struct task_struct *prev, struct task_struct *next)
+{
+	struct thread_info *ti;
+
+	do_account_vtime(prev, 0);
+	ti = task_thread_info(prev);
+	ti->user_timer = S390_lowcore.user_timer;
+	ti->system_timer = S390_lowcore.system_timer;
+	ti = task_thread_info(next);
+	S390_lowcore.user_timer = ti->user_timer;
+	S390_lowcore.system_timer = ti->system_timer;
+}
+
+void account_process_tick(struct task_struct *tsk, int user_tick)
+{
+	do_account_vtime(tsk, HARDIRQ_OFFSET);
+}
+
+/*
+ * Update process times based on virtual cpu times stored by entry.S
+ * to the lowcore fields user_timer, system_timer & steal_clock.
+ */
+void account_system_vtime(struct task_struct *tsk)
+{
+	struct thread_info *ti = task_thread_info(tsk);
+	__u64 timer, system;
+
+	timer = S390_lowcore.last_update_timer;
+	S390_lowcore.last_update_timer = get_vtimer();
+	S390_lowcore.system_timer += timer - S390_lowcore.last_update_timer;
+
+	system = S390_lowcore.system_timer - ti->system_timer;
+	S390_lowcore.steal_timer -= system;
+	ti->system_timer = S390_lowcore.system_timer;
+	account_system_time(tsk, 0, system, system);
+}
+EXPORT_SYMBOL_GPL(account_system_vtime);
+
+void __kprobes vtime_stop_cpu(void)
+{
+	struct s390_idle_data *idle = &__get_cpu_var(s390_idle);
+	struct vtimer_queue *vq = &__get_cpu_var(virt_cpu_timer);
+	unsigned long long idle_time;
+	unsigned long psw_mask;
+
+	trace_hardirqs_on();
+	/* Don't trace preempt off for idle. */
+	stop_critical_timings();
+
+	/* Wait for external, I/O or machine check interrupt. */
+	psw_mask = psw_kernel_bits | PSW_MASK_WAIT | PSW_MASK_DAT |
+		PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK;
+	idle->nohz_delay = 0;
+
+	/* Call the assembler magic in entry.S */
+	psw_idle(idle, vq, psw_mask, !list_empty(&vq->list));
+
+	/* Reenable preemption tracer. */
+	start_critical_timings();
+
+	/* Account time spent with enabled wait psw loaded as idle time. */
+	idle->sequence++;
+	smp_wmb();
+	idle_time = idle->idle_exit - idle->idle_enter;
+	idle->idle_time += idle_time;
+	idle->idle_enter = idle->idle_exit = 0ULL;
+	idle->idle_count++;
+	account_idle_time(idle_time);
+	smp_wmb();
+	idle->sequence++;
+}
+
+cputime64_t s390_get_idle_time(int cpu)
+{
+	struct s390_idle_data *idle = &per_cpu(s390_idle, cpu);
+	unsigned long long now, idle_enter, idle_exit;
+	unsigned int sequence;
+
+	do {
+		now = get_clock();
+		sequence = ACCESS_ONCE(idle->sequence);
+		idle_enter = ACCESS_ONCE(idle->idle_enter);
+		idle_exit = ACCESS_ONCE(idle->idle_exit);
+	} while ((sequence & 1) || (idle->sequence != sequence));
+	return idle_enter ? ((idle_exit ? : now) - idle_enter) : 0;
+}
+
+/*
+ * Sorted add to a list. List is linear searched until first bigger
+ * element is found.
+ */
+static void list_add_sorted(struct vtimer_list *timer, struct list_head *head)
+{
+	struct vtimer_list *event;
+
+	list_for_each_entry(event, head, entry) {
+		if (event->expires > timer->expires) {
+			list_add_tail(&timer->entry, &event->entry);
+			return;
+		}
+	}
+	list_add_tail(&timer->entry, head);
+}
+
+/*
+ * Do the callback functions of expired vtimer events.
+ * Called from within the interrupt handler.
+ */
+static void do_callbacks(struct list_head *cb_list)
+{
+	struct vtimer_queue *vq;
+	struct vtimer_list *event, *tmp;
+
+	if (list_empty(cb_list))
+		return;
+
+	vq = &__get_cpu_var(virt_cpu_timer);
+
+	list_for_each_entry_safe(event, tmp, cb_list, entry) {
+		list_del_init(&event->entry);
+		(event->function)(event->data);
+		if (event->interval) {
+			/* Recharge interval timer */
+			event->expires = event->interval + vq->elapsed;
+			spin_lock(&vq->lock);
+			list_add_sorted(event, &vq->list);
+			spin_unlock(&vq->lock);
+		}
+	}
+}
+
+/*
+ * Handler for the virtual CPU timer.
+ */
+static void do_cpu_timer_interrupt(struct ext_code ext_code,
+				   unsigned int param32, unsigned long param64)
+{
+	struct vtimer_queue *vq;
+	struct vtimer_list *event, *tmp;
+	struct list_head cb_list;	/* the callback queue */
+	__u64 elapsed, next;
+
+	kstat_cpu(smp_processor_id()).irqs[EXTINT_TMR]++;
+	INIT_LIST_HEAD(&cb_list);
+	vq = &__get_cpu_var(virt_cpu_timer);
+
+	/* walk timer list, fire all expired events */
+	spin_lock(&vq->lock);
+
+	elapsed = vq->elapsed + (vq->timer - S390_lowcore.async_enter_timer);
+	BUG_ON((s64) elapsed < 0);
+	vq->elapsed = 0;
+	list_for_each_entry_safe(event, tmp, &vq->list, entry) {
+		if (event->expires < elapsed)
+			/* move expired timer to the callback queue */
+			list_move_tail(&event->entry, &cb_list);
+		else
+			event->expires -= elapsed;
+	}
+	spin_unlock(&vq->lock);
+
+	do_callbacks(&cb_list);
+
+	/* next event is first in list */
+	next = VTIMER_MAX_SLICE;
+	spin_lock(&vq->lock);
+	if (!list_empty(&vq->list)) {
+		event = list_first_entry(&vq->list, struct vtimer_list, entry);
+		next = event->expires;
+	}
+	spin_unlock(&vq->lock);
+	/*
+	 * To improve precision add the time spent by the
+	 * interrupt handler to the elapsed time.
+	 * Note: CPU timer counts down and we got an interrupt,
+	 *	 the current content is negative
+	 */
+	elapsed = S390_lowcore.async_enter_timer - get_vtimer();
+	set_vtimer(next - elapsed);
+	vq->timer = next - elapsed;
+	vq->elapsed = elapsed;
+}
+
+void init_virt_timer(struct vtimer_list *timer)
+{
+	timer->function = NULL;
+	INIT_LIST_HEAD(&timer->entry);
+}
+EXPORT_SYMBOL(init_virt_timer);
+
+static inline int vtimer_pending(struct vtimer_list *timer)
+{
+	return (!list_empty(&timer->entry));
+}
+
+/*
+ * this function should only run on the specified CPU
+ */
+static void internal_add_vtimer(struct vtimer_list *timer)
+{
+	struct vtimer_queue *vq;
+	unsigned long flags;
+	__u64 left, expires;
+
+	vq = &per_cpu(virt_cpu_timer, timer->cpu);
+	spin_lock_irqsave(&vq->lock, flags);
+
+	BUG_ON(timer->cpu != smp_processor_id());
+
+	if (list_empty(&vq->list)) {
+		/* First timer on this cpu, just program it. */
+		list_add(&timer->entry, &vq->list);
+		set_vtimer(timer->expires);
+		vq->timer = timer->expires;
+		vq->elapsed = 0;
+	} else {
+		/* Check progress of old timers. */
+		expires = timer->expires;
+		left = get_vtimer();
+		if (likely((s64) expires < (s64) left)) {
+			/* The new timer expires before the current timer. */
+			set_vtimer(expires);
+			vq->elapsed += vq->timer - left;
+			vq->timer = expires;
+		} else {
+			vq->elapsed += vq->timer - left;
+			vq->timer = left;
+		}
+		/* Insert new timer into per cpu list. */
+		timer->expires += vq->elapsed;
+		list_add_sorted(timer, &vq->list);
+	}
+
+	spin_unlock_irqrestore(&vq->lock, flags);
+	/* release CPU acquired in prepare_vtimer or mod_virt_timer() */
+	put_cpu();
+}
+
+static inline void prepare_vtimer(struct vtimer_list *timer)
+{
+	BUG_ON(!timer->function);
+	BUG_ON(!timer->expires || timer->expires > VTIMER_MAX_SLICE);
+	BUG_ON(vtimer_pending(timer));
+	timer->cpu = get_cpu();
+}
+
+/*
+ * add_virt_timer - add an oneshot virtual CPU timer
+ */
+void add_virt_timer(void *new)
+{
+	struct vtimer_list *timer;
+
+	timer = (struct vtimer_list *)new;
+	prepare_vtimer(timer);
+	timer->interval = 0;
+	internal_add_vtimer(timer);
+}
+EXPORT_SYMBOL(add_virt_timer);
+
+/*
+ * add_virt_timer_int - add an interval virtual CPU timer
+ */
+void add_virt_timer_periodic(void *new)
+{
+	struct vtimer_list *timer;
+
+	timer = (struct vtimer_list *)new;
+	prepare_vtimer(timer);
+	timer->interval = timer->expires;
+	internal_add_vtimer(timer);
+}
+EXPORT_SYMBOL(add_virt_timer_periodic);
+
+static int __mod_vtimer(struct vtimer_list *timer, __u64 expires, int periodic)
+{
+	struct vtimer_queue *vq;
+	unsigned long flags;
+	int cpu;
+
+	BUG_ON(!timer->function);
+	BUG_ON(!expires || expires > VTIMER_MAX_SLICE);
+
+	if (timer->expires == expires && vtimer_pending(timer))
+		return 1;
+
+	cpu = get_cpu();
+	vq = &per_cpu(virt_cpu_timer, cpu);
+
+	/* disable interrupts before test if timer is pending */
+	spin_lock_irqsave(&vq->lock, flags);
+
+	/* if timer isn't pending add it on the current CPU */
+	if (!vtimer_pending(timer)) {
+		spin_unlock_irqrestore(&vq->lock, flags);
+
+		if (periodic)
+			timer->interval = expires;
+		else
+			timer->interval = 0;
+		timer->expires = expires;
+		timer->cpu = cpu;
+		internal_add_vtimer(timer);
+		return 0;
+	}
+
+	/* check if we run on the right CPU */
+	BUG_ON(timer->cpu != cpu);
+
+	list_del_init(&timer->entry);
+	timer->expires = expires;
+	if (periodic)
+		timer->interval = expires;
+
+	/* the timer can't expire anymore so we can release the lock */
+	spin_unlock_irqrestore(&vq->lock, flags);
+	internal_add_vtimer(timer);
+	return 1;
+}
+
+/*
+ * If we change a pending timer the function must be called on the CPU
+ * where the timer is running on.
+ *
+ * returns whether it has modified a pending timer (1) or not (0)
+ */
+int mod_virt_timer(struct vtimer_list *timer, __u64 expires)
+{
+	return __mod_vtimer(timer, expires, 0);
+}
+EXPORT_SYMBOL(mod_virt_timer);
+
+/*
+ * If we change a pending timer the function must be called on the CPU
+ * where the timer is running on.
+ *
+ * returns whether it has modified a pending timer (1) or not (0)
+ */
+int mod_virt_timer_periodic(struct vtimer_list *timer, __u64 expires)
+{
+	return __mod_vtimer(timer, expires, 1);
+}
+EXPORT_SYMBOL(mod_virt_timer_periodic);
+
+/*
+ * delete a virtual timer
+ *
+ * returns whether the deleted timer was pending (1) or not (0)
+ */
+int del_virt_timer(struct vtimer_list *timer)
+{
+	unsigned long flags;
+	struct vtimer_queue *vq;
+
+	/* check if timer is pending */
+	if (!vtimer_pending(timer))
+		return 0;
+
+	vq = &per_cpu(virt_cpu_timer, timer->cpu);
+	spin_lock_irqsave(&vq->lock, flags);
+
+	/* we don't interrupt a running timer, just let it expire! */
+	list_del_init(&timer->entry);
+
+	spin_unlock_irqrestore(&vq->lock, flags);
+	return 1;
+}
+EXPORT_SYMBOL(del_virt_timer);
+
+/*
+ * Start the virtual CPU timer on the current CPU.
+ */
+void init_cpu_vtimer(void)
+{
+	struct vtimer_queue *vq;
+
+	/* initialize per cpu vtimer structure */
+	vq = &__get_cpu_var(virt_cpu_timer);
+	INIT_LIST_HEAD(&vq->list);
+	spin_lock_init(&vq->lock);
+
+	/* enable cpu timer interrupts */
+	__ctl_set_bit(0,10);
+
+	/* set initial cpu timer */
+	set_vtimer(0x7fffffffffffffffULL);
+}
+
+static int __cpuinit s390_nohz_notify(struct notifier_block *self,
+				      unsigned long action, void *hcpu)
+{
+	struct s390_idle_data *idle;
+	long cpu = (long) hcpu;
+
+	idle = &per_cpu(s390_idle, cpu);
+	switch (action) {
+	case CPU_DYING:
+	case CPU_DYING_FROZEN:
+		idle->nohz_delay = 0;
+	default:
+		break;
+	}
+	return NOTIFY_OK;
+}
+
+void __init vtime_init(void)
+{
+	/* request the cpu timer external interrupt */
+	if (register_external_interrupt(0x1005, do_cpu_timer_interrupt))
+		panic("Couldn't request external interrupt 0x1005");
+
+	/* Enable cpu timer interrupts on the boot cpu. */
+	init_cpu_vtimer();
+	cpu_notifier(s390_nohz_notify, 0);
+}
+