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-/*
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- * VMI paravirtual timer support routines.
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- *
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- * Copyright (C) 2005, VMware, Inc.
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License as published by
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- * the Free Software Foundation; either version 2 of the License, or
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- * (at your option) any later version.
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- *
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- * This program is distributed in the hope that it will be useful, but
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- * WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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- * NON INFRINGEMENT. See the GNU General Public License for more
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- * details.
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- *
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- * You should have received a copy of the GNU General Public License
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- * along with this program; if not, write to the Free Software
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- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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- *
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- * Send feedback to dhecht@vmware.com
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- *
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- */
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-
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-/*
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- * Portions of this code from arch/i386/kernel/timers/timer_tsc.c.
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- * Portions of the CONFIG_NO_IDLE_HZ code from arch/s390/kernel/time.c.
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- * See comments there for proper credits.
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- */
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-
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-#include <linux/spinlock.h>
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-#include <linux/init.h>
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-#include <linux/errno.h>
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-#include <linux/jiffies.h>
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-#include <linux/interrupt.h>
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-#include <linux/kernel_stat.h>
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-#include <linux/rcupdate.h>
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-#include <linux/clocksource.h>
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-
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-#include <asm/timer.h>
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-#include <asm/io.h>
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-#include <asm/apic.h>
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-#include <asm/div64.h>
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-#include <asm/timer.h>
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-#include <asm/desc.h>
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-
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-#include <asm/vmi.h>
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-#include <asm/vmi_time.h>
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-
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-#include <mach_timer.h>
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-#include <io_ports.h>
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-
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-#ifdef CONFIG_X86_LOCAL_APIC
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-#define VMI_ALARM_WIRING VMI_ALARM_WIRED_LVTT
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-#else
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-#define VMI_ALARM_WIRING VMI_ALARM_WIRED_IRQ0
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-#endif
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-
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-/* Cached VMI operations */
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-struct vmi_timer_ops vmi_timer_ops;
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-
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-#ifdef CONFIG_NO_IDLE_HZ
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-
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-/* /proc/sys/kernel/hz_timer state. */
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-int sysctl_hz_timer;
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-
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-/* Some stats */
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-static DEFINE_PER_CPU(unsigned long, vmi_idle_no_hz_irqs);
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-static DEFINE_PER_CPU(unsigned long, vmi_idle_no_hz_jiffies);
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-static DEFINE_PER_CPU(unsigned long, idle_start_jiffies);
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-
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-#endif /* CONFIG_NO_IDLE_HZ */
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-
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-/* Number of alarms per second. By default this is CONFIG_VMI_ALARM_HZ. */
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-static int alarm_hz = CONFIG_VMI_ALARM_HZ;
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-
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-/* Cache of the value get_cycle_frequency / HZ. */
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-static signed long long cycles_per_jiffy;
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-
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-/* Cache of the value get_cycle_frequency / alarm_hz. */
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-static signed long long cycles_per_alarm;
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-
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-/* The number of cycles accounted for by the 'jiffies'/'xtime' count.
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- * Protected by xtime_lock. */
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-static unsigned long long real_cycles_accounted_system;
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-
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-/* The number of cycles accounted for by update_process_times(), per cpu. */
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-static DEFINE_PER_CPU(unsigned long long, process_times_cycles_accounted_cpu);
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-
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-/* The number of stolen cycles accounted, per cpu. */
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-static DEFINE_PER_CPU(unsigned long long, stolen_cycles_accounted_cpu);
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-
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-/* Clock source. */
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-static cycle_t read_real_cycles(void)
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-{
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- return vmi_timer_ops.get_cycle_counter(VMI_CYCLES_REAL);
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-}
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-
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-static cycle_t read_available_cycles(void)
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-{
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- return vmi_timer_ops.get_cycle_counter(VMI_CYCLES_AVAILABLE);
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-}
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-
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-#if 0
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-static cycle_t read_stolen_cycles(void)
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-{
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- return vmi_timer_ops.get_cycle_counter(VMI_CYCLES_STOLEN);
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-}
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-#endif /* 0 */
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-
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-static struct clocksource clocksource_vmi = {
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- .name = "vmi-timer",
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- .rating = 450,
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- .read = read_real_cycles,
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- .mask = CLOCKSOURCE_MASK(64),
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- .mult = 0, /* to be set */
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- .shift = 22,
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- .flags = CLOCK_SOURCE_IS_CONTINUOUS,
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-};
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-
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-
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-/* Timer interrupt handler. */
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-static irqreturn_t vmi_timer_interrupt(int irq, void *dev_id);
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-
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-static struct irqaction vmi_timer_irq = {
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- .handler = vmi_timer_interrupt,
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- .flags = IRQF_DISABLED,
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- .mask = CPU_MASK_NONE,
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- .name = "VMI-alarm",
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-};
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-
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-/* Alarm rate */
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-static int __init vmi_timer_alarm_rate_setup(char* str)
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-{
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- int alarm_rate;
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- if (get_option(&str, &alarm_rate) == 1 && alarm_rate > 0) {
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- alarm_hz = alarm_rate;
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- printk(KERN_WARNING "VMI timer alarm HZ set to %d\n", alarm_hz);
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- }
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- return 1;
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-}
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-__setup("vmi_timer_alarm_hz=", vmi_timer_alarm_rate_setup);
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-
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-
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-/* Initialization */
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-static void vmi_get_wallclock_ts(struct timespec *ts)
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-{
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- unsigned long long wallclock;
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- wallclock = vmi_timer_ops.get_wallclock(); // nsec units
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- ts->tv_nsec = do_div(wallclock, 1000000000);
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- ts->tv_sec = wallclock;
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-}
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-
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-unsigned long vmi_get_wallclock(void)
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-{
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- struct timespec ts;
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- vmi_get_wallclock_ts(&ts);
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- return ts.tv_sec;
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-}
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-
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-int vmi_set_wallclock(unsigned long now)
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-{
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- return -1;
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-}
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-
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-unsigned long long vmi_get_sched_cycles(void)
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-{
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- return read_available_cycles();
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-}
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-
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-unsigned long vmi_cpu_khz(void)
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-{
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- unsigned long long khz;
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-
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- khz = vmi_timer_ops.get_cycle_frequency();
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- (void)do_div(khz, 1000);
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- return khz;
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-}
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-
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-void __init vmi_time_init(void)
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-{
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- unsigned long long cycles_per_sec, cycles_per_msec;
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- unsigned long flags;
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-
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- local_irq_save(flags);
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- setup_irq(0, &vmi_timer_irq);
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-#ifdef CONFIG_X86_LOCAL_APIC
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- set_intr_gate(LOCAL_TIMER_VECTOR, apic_vmi_timer_interrupt);
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-#endif
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-
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- real_cycles_accounted_system = read_real_cycles();
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- per_cpu(process_times_cycles_accounted_cpu, 0) = read_available_cycles();
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-
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- cycles_per_sec = vmi_timer_ops.get_cycle_frequency();
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- cycles_per_jiffy = cycles_per_sec;
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- (void)do_div(cycles_per_jiffy, HZ);
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- cycles_per_alarm = cycles_per_sec;
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- (void)do_div(cycles_per_alarm, alarm_hz);
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- cycles_per_msec = cycles_per_sec;
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- (void)do_div(cycles_per_msec, 1000);
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-
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- printk(KERN_WARNING "VMI timer cycles/sec = %llu ; cycles/jiffy = %llu ;"
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- "cycles/alarm = %llu\n", cycles_per_sec, cycles_per_jiffy,
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- cycles_per_alarm);
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-
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- clocksource_vmi.mult = clocksource_khz2mult(cycles_per_msec,
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- clocksource_vmi.shift);
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- if (clocksource_register(&clocksource_vmi))
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- printk(KERN_WARNING "Error registering VMITIME clocksource.");
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-
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- /* Disable PIT. */
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- outb_p(0x3a, PIT_MODE); /* binary, mode 5, LSB/MSB, ch 0 */
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-
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- /* schedule the alarm. do this in phase with process_times_cycles_accounted_cpu
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- * reduce the latency calling update_process_times. */
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- vmi_timer_ops.set_alarm(
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- VMI_ALARM_WIRED_IRQ0 | VMI_ALARM_IS_PERIODIC | VMI_CYCLES_AVAILABLE,
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- per_cpu(process_times_cycles_accounted_cpu, 0) + cycles_per_alarm,
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- cycles_per_alarm);
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-
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- local_irq_restore(flags);
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-}
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-
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-#ifdef CONFIG_X86_LOCAL_APIC
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-
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-void __init vmi_timer_setup_boot_alarm(void)
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-{
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- local_irq_disable();
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-
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- /* Route the interrupt to the correct vector. */
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- apic_write_around(APIC_LVTT, LOCAL_TIMER_VECTOR);
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-
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- /* Cancel the IRQ0 wired alarm, and setup the LVTT alarm. */
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- vmi_timer_ops.cancel_alarm(VMI_CYCLES_AVAILABLE);
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- vmi_timer_ops.set_alarm(
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- VMI_ALARM_WIRED_LVTT | VMI_ALARM_IS_PERIODIC | VMI_CYCLES_AVAILABLE,
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- per_cpu(process_times_cycles_accounted_cpu, 0) + cycles_per_alarm,
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- cycles_per_alarm);
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- local_irq_enable();
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-}
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-
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-/* Initialize the time accounting variables for an AP on an SMP system.
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- * Also, set the local alarm for the AP. */
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-void __devinit vmi_timer_setup_secondary_alarm(void)
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-{
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- int cpu = smp_processor_id();
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-
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- /* Route the interrupt to the correct vector. */
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- apic_write_around(APIC_LVTT, LOCAL_TIMER_VECTOR);
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-
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- per_cpu(process_times_cycles_accounted_cpu, cpu) = read_available_cycles();
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-
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- vmi_timer_ops.set_alarm(
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- VMI_ALARM_WIRED_LVTT | VMI_ALARM_IS_PERIODIC | VMI_CYCLES_AVAILABLE,
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- per_cpu(process_times_cycles_accounted_cpu, cpu) + cycles_per_alarm,
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- cycles_per_alarm);
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-}
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-
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-#endif
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-
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-/* Update system wide (real) time accounting (e.g. jiffies, xtime). */
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-static void vmi_account_real_cycles(unsigned long long cur_real_cycles)
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-{
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- long long cycles_not_accounted;
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-
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- write_seqlock(&xtime_lock);
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-
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- cycles_not_accounted = cur_real_cycles - real_cycles_accounted_system;
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- while (cycles_not_accounted >= cycles_per_jiffy) {
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- /* systems wide jiffies. */
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- do_timer(1);
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-
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- cycles_not_accounted -= cycles_per_jiffy;
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- real_cycles_accounted_system += cycles_per_jiffy;
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- }
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-
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- write_sequnlock(&xtime_lock);
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-}
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-
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-/* Update per-cpu process times. */
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-static void vmi_account_process_times_cycles(struct pt_regs *regs, int cpu,
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- unsigned long long cur_process_times_cycles)
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-{
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- long long cycles_not_accounted;
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- cycles_not_accounted = cur_process_times_cycles -
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- per_cpu(process_times_cycles_accounted_cpu, cpu);
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-
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- while (cycles_not_accounted >= cycles_per_jiffy) {
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- /* Account time to the current process. This includes
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- * calling into the scheduler to decrement the timeslice
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- * and possibly reschedule.*/
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- update_process_times(user_mode(regs));
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- /* XXX handle /proc/profile multiplier. */
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- profile_tick(CPU_PROFILING);
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-
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- cycles_not_accounted -= cycles_per_jiffy;
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- per_cpu(process_times_cycles_accounted_cpu, cpu) += cycles_per_jiffy;
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- }
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-}
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-
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-#ifdef CONFIG_NO_IDLE_HZ
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-/* Update per-cpu idle times. Used when a no-hz halt is ended. */
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-static void vmi_account_no_hz_idle_cycles(int cpu,
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- unsigned long long cur_process_times_cycles)
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-{
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- long long cycles_not_accounted;
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- unsigned long no_idle_hz_jiffies = 0;
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-
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- cycles_not_accounted = cur_process_times_cycles -
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- per_cpu(process_times_cycles_accounted_cpu, cpu);
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-
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- while (cycles_not_accounted >= cycles_per_jiffy) {
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- no_idle_hz_jiffies++;
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- cycles_not_accounted -= cycles_per_jiffy;
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- per_cpu(process_times_cycles_accounted_cpu, cpu) += cycles_per_jiffy;
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- }
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- /* Account time to the idle process. */
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- account_steal_time(idle_task(cpu), jiffies_to_cputime(no_idle_hz_jiffies));
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-}
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-#endif
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-
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-/* Update per-cpu stolen time. */
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-static void vmi_account_stolen_cycles(int cpu,
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- unsigned long long cur_real_cycles,
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- unsigned long long cur_avail_cycles)
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-{
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- long long stolen_cycles_not_accounted;
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- unsigned long stolen_jiffies = 0;
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-
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- if (cur_real_cycles < cur_avail_cycles)
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- return;
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-
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- stolen_cycles_not_accounted = cur_real_cycles - cur_avail_cycles -
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- per_cpu(stolen_cycles_accounted_cpu, cpu);
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-
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- while (stolen_cycles_not_accounted >= cycles_per_jiffy) {
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- stolen_jiffies++;
|
|
|
|
- stolen_cycles_not_accounted -= cycles_per_jiffy;
|
|
|
|
- per_cpu(stolen_cycles_accounted_cpu, cpu) += cycles_per_jiffy;
|
|
|
|
- }
|
|
|
|
- /* HACK: pass NULL to force time onto cpustat->steal. */
|
|
|
|
- account_steal_time(NULL, jiffies_to_cputime(stolen_jiffies));
|
|
|
|
-}
|
|
|
|
-
|
|
|
|
-/* Body of either IRQ0 interrupt handler (UP no local-APIC) or
|
|
|
|
- * local-APIC LVTT interrupt handler (UP & local-APIC or SMP). */
|
|
|
|
-static void vmi_local_timer_interrupt(int cpu)
|
|
|
|
-{
|
|
|
|
- unsigned long long cur_real_cycles, cur_process_times_cycles;
|
|
|
|
-
|
|
|
|
- cur_real_cycles = read_real_cycles();
|
|
|
|
- cur_process_times_cycles = read_available_cycles();
|
|
|
|
- /* Update system wide (real) time state (xtime, jiffies). */
|
|
|
|
- vmi_account_real_cycles(cur_real_cycles);
|
|
|
|
- /* Update per-cpu process times. */
|
|
|
|
- vmi_account_process_times_cycles(get_irq_regs(), cpu, cur_process_times_cycles);
|
|
|
|
- /* Update time stolen from this cpu by the hypervisor. */
|
|
|
|
- vmi_account_stolen_cycles(cpu, cur_real_cycles, cur_process_times_cycles);
|
|
|
|
-}
|
|
|
|
-
|
|
|
|
-#ifdef CONFIG_NO_IDLE_HZ
|
|
|
|
-
|
|
|
|
-/* Must be called only from idle loop, with interrupts disabled. */
|
|
|
|
-int vmi_stop_hz_timer(void)
|
|
|
|
-{
|
|
|
|
- /* Note that cpu_set, cpu_clear are (SMP safe) atomic on x86. */
|
|
|
|
-
|
|
|
|
- unsigned long seq, next;
|
|
|
|
- unsigned long long real_cycles_expiry;
|
|
|
|
- int cpu = smp_processor_id();
|
|
|
|
-
|
|
|
|
- BUG_ON(!irqs_disabled());
|
|
|
|
- if (sysctl_hz_timer != 0)
|
|
|
|
- return 0;
|
|
|
|
-
|
|
|
|
- cpu_set(cpu, nohz_cpu_mask);
|
|
|
|
- smp_mb();
|
|
|
|
-
|
|
|
|
- if (rcu_needs_cpu(cpu) || local_softirq_pending() ||
|
|
|
|
- (next = next_timer_interrupt(),
|
|
|
|
- time_before_eq(next, jiffies + HZ/CONFIG_VMI_ALARM_HZ))) {
|
|
|
|
- cpu_clear(cpu, nohz_cpu_mask);
|
|
|
|
- return 0;
|
|
|
|
- }
|
|
|
|
-
|
|
|
|
- /* Convert jiffies to the real cycle counter. */
|
|
|
|
- do {
|
|
|
|
- seq = read_seqbegin(&xtime_lock);
|
|
|
|
- real_cycles_expiry = real_cycles_accounted_system +
|
|
|
|
- (long)(next - jiffies) * cycles_per_jiffy;
|
|
|
|
- } while (read_seqretry(&xtime_lock, seq));
|
|
|
|
-
|
|
|
|
- /* This cpu is going idle. Disable the periodic alarm. */
|
|
|
|
- vmi_timer_ops.cancel_alarm(VMI_CYCLES_AVAILABLE);
|
|
|
|
- per_cpu(idle_start_jiffies, cpu) = jiffies;
|
|
|
|
- /* Set the real time alarm to expire at the next event. */
|
|
|
|
- vmi_timer_ops.set_alarm(
|
|
|
|
- VMI_ALARM_WIRING | VMI_ALARM_IS_ONESHOT | VMI_CYCLES_REAL,
|
|
|
|
- real_cycles_expiry, 0);
|
|
|
|
- return 1;
|
|
|
|
-}
|
|
|
|
-
|
|
|
|
-static void vmi_reenable_hz_timer(int cpu)
|
|
|
|
-{
|
|
|
|
- /* For /proc/vmi/info idle_hz stat. */
|
|
|
|
- per_cpu(vmi_idle_no_hz_jiffies, cpu) += jiffies - per_cpu(idle_start_jiffies, cpu);
|
|
|
|
- per_cpu(vmi_idle_no_hz_irqs, cpu)++;
|
|
|
|
-
|
|
|
|
- /* Don't bother explicitly cancelling the one-shot alarm -- at
|
|
|
|
- * worse we will receive a spurious timer interrupt. */
|
|
|
|
- vmi_timer_ops.set_alarm(
|
|
|
|
- VMI_ALARM_WIRING | VMI_ALARM_IS_PERIODIC | VMI_CYCLES_AVAILABLE,
|
|
|
|
- per_cpu(process_times_cycles_accounted_cpu, cpu) + cycles_per_alarm,
|
|
|
|
- cycles_per_alarm);
|
|
|
|
- /* Indicate this cpu is no longer nohz idle. */
|
|
|
|
- cpu_clear(cpu, nohz_cpu_mask);
|
|
|
|
-}
|
|
|
|
-
|
|
|
|
-/* Called from interrupt handlers when (local) HZ timer is disabled. */
|
|
|
|
-void vmi_account_time_restart_hz_timer(void)
|
|
|
|
-{
|
|
|
|
- unsigned long long cur_real_cycles, cur_process_times_cycles;
|
|
|
|
- int cpu = smp_processor_id();
|
|
|
|
-
|
|
|
|
- BUG_ON(!irqs_disabled());
|
|
|
|
- /* Account the time during which the HZ timer was disabled. */
|
|
|
|
- cur_real_cycles = read_real_cycles();
|
|
|
|
- cur_process_times_cycles = read_available_cycles();
|
|
|
|
- /* Update system wide (real) time state (xtime, jiffies). */
|
|
|
|
- vmi_account_real_cycles(cur_real_cycles);
|
|
|
|
- /* Update per-cpu idle times. */
|
|
|
|
- vmi_account_no_hz_idle_cycles(cpu, cur_process_times_cycles);
|
|
|
|
- /* Update time stolen from this cpu by the hypervisor. */
|
|
|
|
- vmi_account_stolen_cycles(cpu, cur_real_cycles, cur_process_times_cycles);
|
|
|
|
- /* Reenable the hz timer. */
|
|
|
|
- vmi_reenable_hz_timer(cpu);
|
|
|
|
-}
|
|
|
|
-
|
|
|
|
-#endif /* CONFIG_NO_IDLE_HZ */
|
|
|
|
-
|
|
|
|
-/* UP (and no local-APIC) VMI-timer alarm interrupt handler.
|
|
|
|
- * Handler for IRQ0. Not used when SMP or X86_LOCAL_APIC after
|
|
|
|
- * APIC setup and setup_boot_vmi_alarm() is called. */
|
|
|
|
-static irqreturn_t vmi_timer_interrupt(int irq, void *dev_id)
|
|
|
|
-{
|
|
|
|
- vmi_local_timer_interrupt(smp_processor_id());
|
|
|
|
- return IRQ_HANDLED;
|
|
|
|
-}
|
|
|
|
-
|
|
|
|
-#ifdef CONFIG_X86_LOCAL_APIC
|
|
|
|
-
|
|
|
|
-/* SMP VMI-timer alarm interrupt handler. Handler for LVTT vector.
|
|
|
|
- * Also used in UP when CONFIG_X86_LOCAL_APIC.
|
|
|
|
- * The wrapper code is from arch/i386/kernel/apic.c#smp_apic_timer_interrupt. */
|
|
|
|
-void smp_apic_vmi_timer_interrupt(struct pt_regs *regs)
|
|
|
|
-{
|
|
|
|
- struct pt_regs *old_regs = set_irq_regs(regs);
|
|
|
|
- int cpu = smp_processor_id();
|
|
|
|
-
|
|
|
|
- /*
|
|
|
|
- * the NMI deadlock-detector uses this.
|
|
|
|
- */
|
|
|
|
- per_cpu(irq_stat,cpu).apic_timer_irqs++;
|
|
|
|
-
|
|
|
|
- /*
|
|
|
|
- * NOTE! We'd better ACK the irq immediately,
|
|
|
|
- * because timer handling can be slow.
|
|
|
|
- */
|
|
|
|
- ack_APIC_irq();
|
|
|
|
-
|
|
|
|
- /*
|
|
|
|
- * update_process_times() expects us to have done irq_enter().
|
|
|
|
- * Besides, if we don't timer interrupts ignore the global
|
|
|
|
- * interrupt lock, which is the WrongThing (tm) to do.
|
|
|
|
- */
|
|
|
|
- irq_enter();
|
|
|
|
- vmi_local_timer_interrupt(cpu);
|
|
|
|
- irq_exit();
|
|
|
|
- set_irq_regs(old_regs);
|
|
|
|
-}
|
|
|
|
-
|
|
|
|
-#endif /* CONFIG_X86_LOCAL_APIC */
|
|
|