mirror of https://gitee.com/openkylin/linux.git
[PATCH] time: x86_64: convert x86_64 to use GENERIC_TIME
This patch converts x86_64 to use the GENERIC_TIME infrastructure and adds clocksource structures for both TSC and HPET (ACPI PM is shared w/ i386). [akpm@osdl.org: fix printk timestamps] [akpm@osdl.org: fix printk ckeanups] [akpm@osdl.org: hpet build fix] Signed-off-by: John Stultz <johnstul@us.ibm.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Andi Kleen <ak@muc.de> Cc: Roman Zippel <zippel@linux-m68k.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
john stultz
Linus Torvalds
parent
c37e7bb5d2
commit
1489939f0a
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@ -24,6 +24,10 @@ config X86
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bool
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default y
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config GENERIC_TIME
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bool
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default y
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config ZONE_DMA32
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bool
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default y
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@ -786,7 +786,7 @@ static void setup_APIC_timer(unsigned int clocks)
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/* Turn off PIT interrupt if we use APIC timer as main timer.
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Only works with the PM timer right now
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TBD fix it for HPET too. */
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if (vxtime.mode == VXTIME_PMTMR &&
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if ((pmtmr_ioport != 0) &&
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smp_processor_id() == boot_cpu_id &&
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apic_runs_main_timer == 1 &&
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!cpu_isset(boot_cpu_id, timer_interrupt_broadcast_ipi_mask)) {
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@ -21,12 +21,6 @@ unsigned long hpet_tick; /* HPET clocks / interrupt */
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int hpet_use_timer; /* Use counter of hpet for time keeping,
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* otherwise PIT
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*/
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unsigned int do_gettimeoffset_hpet(void)
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{
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/* cap counter read to one tick to avoid inconsistencies */
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unsigned long counter = hpet_readl(HPET_COUNTER) - vxtime.last;
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return (min(counter,hpet_tick) * vxtime.quot) >> US_SCALE;
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}
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#ifdef CONFIG_HPET
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static __init int late_hpet_init(void)
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@ -451,3 +445,61 @@ static int __init nohpet_setup(char *s)
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__setup("nohpet", nohpet_setup);
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#define HPET_MASK 0xFFFFFFFF
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#define HPET_SHIFT 22
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/* FSEC = 10^-15 NSEC = 10^-9 */
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#define FSEC_PER_NSEC 1000000
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static void *hpet_ptr;
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static cycle_t read_hpet(void)
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{
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return (cycle_t)readl(hpet_ptr);
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}
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struct clocksource clocksource_hpet = {
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.name = "hpet",
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.rating = 250,
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.read = read_hpet,
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.mask = (cycle_t)HPET_MASK,
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.mult = 0, /* set below */
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.shift = HPET_SHIFT,
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.flags = CLOCK_SOURCE_IS_CONTINUOUS,
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};
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static int __init init_hpet_clocksource(void)
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{
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unsigned long hpet_period;
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void __iomem *hpet_base;
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u64 tmp;
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if (!hpet_address)
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return -ENODEV;
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/* calculate the hpet address: */
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hpet_base = ioremap_nocache(hpet_address, HPET_MMAP_SIZE);
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hpet_ptr = hpet_base + HPET_COUNTER;
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/* calculate the frequency: */
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hpet_period = readl(hpet_base + HPET_PERIOD);
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/*
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* hpet period is in femto seconds per cycle
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* so we need to convert this to ns/cyc units
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* aproximated by mult/2^shift
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*
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* fsec/cyc * 1nsec/1000000fsec = nsec/cyc = mult/2^shift
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* fsec/cyc * 1ns/1000000fsec * 2^shift = mult
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* fsec/cyc * 2^shift * 1nsec/1000000fsec = mult
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* (fsec/cyc << shift)/1000000 = mult
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* (hpet_period << shift)/FSEC_PER_NSEC = mult
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*/
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tmp = (u64)hpet_period << HPET_SHIFT;
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do_div(tmp, FSEC_PER_NSEC);
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clocksource_hpet.mult = (u32)tmp;
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return clocksource_register(&clocksource_hpet);
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}
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module_init(init_hpet_clocksource);
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@ -24,15 +24,6 @@
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#include <asm/msr.h>
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#include <asm/vsyscall.h>
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/* The I/O port the PMTMR resides at.
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* The location is detected during setup_arch(),
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* in arch/i386/kernel/acpi/boot.c */
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u32 pmtmr_ioport __read_mostly;
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/* value of the Power timer at last timer interrupt */
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static u32 offset_delay;
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static u32 last_pmtmr_tick;
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#define ACPI_PM_MASK 0xFFFFFF /* limit it to 24 bits */
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static inline u32 cyc2us(u32 cycles)
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@ -48,38 +39,6 @@ static inline u32 cyc2us(u32 cycles)
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return (cycles >> 10);
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}
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int pmtimer_mark_offset(void)
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{
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static int first_run = 1;
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unsigned long tsc;
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u32 lost;
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u32 tick = inl(pmtmr_ioport);
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u32 delta;
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delta = cyc2us((tick - last_pmtmr_tick) & ACPI_PM_MASK);
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last_pmtmr_tick = tick;
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monotonic_base += delta * NSEC_PER_USEC;
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delta += offset_delay;
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lost = delta / (USEC_PER_SEC / HZ);
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offset_delay = delta % (USEC_PER_SEC / HZ);
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rdtscll(tsc);
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vxtime.last_tsc = tsc - offset_delay * (u64)cpu_khz / 1000;
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/* don't calculate delay for first run,
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or if we've got less then a tick */
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if (first_run || (lost < 1)) {
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first_run = 0;
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offset_delay = 0;
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}
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return lost - 1;
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}
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static unsigned pmtimer_wait_tick(void)
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{
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u32 a, b;
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@ -101,23 +60,6 @@ void pmtimer_wait(unsigned us)
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} while (cyc2us(b - a) < us);
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}
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void pmtimer_resume(void)
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{
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last_pmtmr_tick = inl(pmtmr_ioport);
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}
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unsigned int do_gettimeoffset_pm(void)
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{
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u32 now, offset, delta = 0;
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offset = last_pmtmr_tick;
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now = inl(pmtmr_ioport);
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delta = (now - offset) & ACPI_PM_MASK;
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return offset_delay + cyc2us(delta);
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}
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static int __init nopmtimer_setup(char *s)
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{
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pmtmr_ioport = 0;
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@ -982,7 +982,6 @@ void __init smp_cpus_done(unsigned int max_cpus)
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smp_cleanup_boot();
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setup_ioapic_dest();
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check_nmi_watchdog();
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time_init_gtod();
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}
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#ifdef CONFIG_HOTPLUG_CPU
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@ -44,9 +44,6 @@
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#include <asm/apic.h>
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#include <asm/hpet.h>
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#ifdef CONFIG_CPU_FREQ
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extern void cpufreq_delayed_get(void);
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#endif
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extern void i8254_timer_resume(void);
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extern int using_apic_timer;
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@ -57,8 +54,6 @@ EXPORT_SYMBOL(rtc_lock);
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DEFINE_SPINLOCK(i8253_lock);
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unsigned long vxtime_hz = PIT_TICK_RATE;
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int report_lost_ticks; /* command line option */
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unsigned long long monotonic_base;
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struct vxtime_data __vxtime __section_vxtime; /* for vsyscalls */
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@ -66,76 +61,6 @@ volatile unsigned long __jiffies __section_jiffies = INITIAL_JIFFIES;
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struct timespec __xtime __section_xtime;
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struct timezone __sys_tz __section_sys_tz;
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unsigned int (*do_gettimeoffset)(void) = do_gettimeoffset_tsc;
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/*
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* This version of gettimeofday() has microsecond resolution and better than
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* microsecond precision, as we're using at least a 10 MHz (usually 14.31818
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* MHz) HPET timer.
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*/
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void do_gettimeofday(struct timeval *tv)
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{
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unsigned long seq;
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unsigned int sec, usec;
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do {
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seq = read_seqbegin(&xtime_lock);
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sec = xtime.tv_sec;
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usec = xtime.tv_nsec / NSEC_PER_USEC;
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/* i386 does some correction here to keep the clock
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monotonous even when ntpd is fixing drift.
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But they didn't work for me, there is a non monotonic
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clock anyways with ntp.
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I dropped all corrections now until a real solution can
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be found. Note when you fix it here you need to do the same
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in arch/x86_64/kernel/vsyscall.c and export all needed
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variables in vmlinux.lds. -AK */
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usec += do_gettimeoffset();
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} while (read_seqretry(&xtime_lock, seq));
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tv->tv_sec = sec + usec / USEC_PER_SEC;
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tv->tv_usec = usec % USEC_PER_SEC;
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}
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EXPORT_SYMBOL(do_gettimeofday);
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/*
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* settimeofday() first undoes the correction that gettimeofday would do
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* on the time, and then saves it. This is ugly, but has been like this for
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* ages already.
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*/
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int do_settimeofday(struct timespec *tv)
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{
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time_t wtm_sec, sec = tv->tv_sec;
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long wtm_nsec, nsec = tv->tv_nsec;
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if ((unsigned long)tv->tv_nsec >= NSEC_PER_SEC)
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return -EINVAL;
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write_seqlock_irq(&xtime_lock);
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nsec -= do_gettimeoffset() * NSEC_PER_USEC;
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wtm_sec = wall_to_monotonic.tv_sec + (xtime.tv_sec - sec);
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wtm_nsec = wall_to_monotonic.tv_nsec + (xtime.tv_nsec - nsec);
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set_normalized_timespec(&xtime, sec, nsec);
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set_normalized_timespec(&wall_to_monotonic, wtm_sec, wtm_nsec);
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ntp_clear();
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write_sequnlock_irq(&xtime_lock);
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clock_was_set();
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return 0;
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}
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EXPORT_SYMBOL(do_settimeofday);
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unsigned long profile_pc(struct pt_regs *regs)
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{
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unsigned long pc = instruction_pointer(regs);
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@ -225,85 +150,9 @@ static void set_rtc_mmss(unsigned long nowtime)
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}
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/* monotonic_clock(): returns # of nanoseconds passed since time_init()
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* Note: This function is required to return accurate
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* time even in the absence of multiple timer ticks.
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*/
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extern unsigned long long cycles_2_ns(unsigned long long cyc);
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unsigned long long monotonic_clock(void)
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{
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unsigned long seq;
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u32 last_offset, this_offset, offset;
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unsigned long long base;
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if (vxtime.mode == VXTIME_HPET) {
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do {
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seq = read_seqbegin(&xtime_lock);
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last_offset = vxtime.last;
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base = monotonic_base;
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this_offset = hpet_readl(HPET_COUNTER);
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} while (read_seqretry(&xtime_lock, seq));
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offset = (this_offset - last_offset);
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offset *= NSEC_PER_TICK / hpet_tick;
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} else {
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do {
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seq = read_seqbegin(&xtime_lock);
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last_offset = vxtime.last_tsc;
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base = monotonic_base;
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} while (read_seqretry(&xtime_lock, seq));
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this_offset = get_cycles_sync();
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offset = cycles_2_ns(this_offset - last_offset);
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}
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return base + offset;
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}
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EXPORT_SYMBOL(monotonic_clock);
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static noinline void handle_lost_ticks(int lost)
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{
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static long lost_count;
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static int warned;
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if (report_lost_ticks) {
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printk(KERN_WARNING "time.c: Lost %d timer tick(s)! ", lost);
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print_symbol("rip %s)\n", get_irq_regs()->rip);
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}
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if (lost_count == 1000 && !warned) {
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printk(KERN_WARNING "warning: many lost ticks.\n"
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KERN_WARNING "Your time source seems to be instable or "
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"some driver is hogging interupts\n");
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print_symbol("rip %s\n", get_irq_regs()->rip);
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if (vxtime.mode == VXTIME_TSC && hpet_address) {
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printk(KERN_WARNING "Falling back to HPET\n");
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if (hpet_use_timer)
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vxtime.last = hpet_readl(HPET_T0_CMP) -
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hpet_tick;
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else
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vxtime.last = hpet_readl(HPET_COUNTER);
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vxtime.mode = VXTIME_HPET;
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vxtime.hpet_address = hpet_address;
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do_gettimeoffset = do_gettimeoffset_hpet;
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}
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/* else should fall back to PIT, but code missing. */
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warned = 1;
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} else
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lost_count++;
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#ifdef CONFIG_CPU_FREQ
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/* In some cases the CPU can change frequency without us noticing
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Give cpufreq a change to catch up. */
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if ((lost_count+1) % 25 == 0)
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cpufreq_delayed_get();
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#endif
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}
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void main_timer_handler(void)
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{
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static unsigned long rtc_update = 0;
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unsigned long tsc;
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int delay = 0, offset = 0, lost = 0;
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/*
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* Here we are in the timer irq handler. We have irqs locally disabled (so we
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* don't need spin_lock_irqsave()) but we don't know if the timer_bh is running
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@ -313,72 +162,11 @@ void main_timer_handler(void)
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write_seqlock(&xtime_lock);
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if (hpet_address)
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offset = hpet_readl(HPET_COUNTER);
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if (hpet_use_timer) {
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/* if we're using the hpet timer functionality,
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* we can more accurately know the counter value
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* when the timer interrupt occured.
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*/
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offset = hpet_readl(HPET_T0_CMP) - hpet_tick;
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delay = hpet_readl(HPET_COUNTER) - offset;
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} else if (!pmtmr_ioport) {
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spin_lock(&i8253_lock);
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outb_p(0x00, 0x43);
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delay = inb_p(0x40);
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delay |= inb(0x40) << 8;
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spin_unlock(&i8253_lock);
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delay = LATCH - 1 - delay;
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}
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tsc = get_cycles_sync();
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if (vxtime.mode == VXTIME_HPET) {
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if (offset - vxtime.last > hpet_tick) {
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lost = (offset - vxtime.last) / hpet_tick - 1;
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}
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monotonic_base +=
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(offset - vxtime.last) * NSEC_PER_TICK / hpet_tick;
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vxtime.last = offset;
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#ifdef CONFIG_X86_PM_TIMER
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} else if (vxtime.mode == VXTIME_PMTMR) {
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lost = pmtimer_mark_offset();
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#endif
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} else {
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offset = (((tsc - vxtime.last_tsc) *
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vxtime.tsc_quot) >> US_SCALE) - USEC_PER_TICK;
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if (offset < 0)
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offset = 0;
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if (offset > USEC_PER_TICK) {
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lost = offset / USEC_PER_TICK;
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offset %= USEC_PER_TICK;
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}
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monotonic_base += cycles_2_ns(tsc - vxtime.last_tsc);
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vxtime.last_tsc = tsc - vxtime.quot * delay / vxtime.tsc_quot;
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if ((((tsc - vxtime.last_tsc) *
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vxtime.tsc_quot) >> US_SCALE) < offset)
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vxtime.last_tsc = tsc -
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(((long) offset << US_SCALE) / vxtime.tsc_quot) - 1;
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}
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if (lost > 0)
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handle_lost_ticks(lost);
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else
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lost = 0;
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/*
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* Do the timer stuff.
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*/
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do_timer(lost + 1);
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do_timer(1);
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#ifndef CONFIG_SMP
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update_process_times(user_mode(get_irq_regs()));
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#endif
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@ -537,12 +325,6 @@ void __init stop_timer_interrupt(void)
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printk(KERN_INFO "timer: %s interrupt stopped.\n", name);
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}
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int __init time_setup(char *str)
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{
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report_lost_ticks = 1;
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return 1;
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}
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static struct irqaction irq0 = {
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timer_interrupt, IRQF_DISABLED, CPU_MASK_NONE, "timer", NULL, NULL
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};
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@ -557,9 +339,7 @@ void __init time_init(void)
|
|||
set_normalized_timespec(&wall_to_monotonic,
|
||||
-xtime.tv_sec, -xtime.tv_nsec);
|
||||
|
||||
if (!hpet_arch_init())
|
||||
vxtime_hz = (FSEC_PER_SEC + hpet_period / 2) / hpet_period;
|
||||
else
|
||||
if (hpet_arch_init())
|
||||
hpet_address = 0;
|
||||
|
||||
if (hpet_use_timer) {
|
||||
|
|
@ -567,82 +347,26 @@ void __init time_init(void)
|
|||
tick_nsec = TICK_NSEC_HPET;
|
||||
cpu_khz = hpet_calibrate_tsc();
|
||||
timename = "HPET";
|
||||
#ifdef CONFIG_X86_PM_TIMER
|
||||
} else if (pmtmr_ioport && !hpet_address) {
|
||||
vxtime_hz = PM_TIMER_FREQUENCY;
|
||||
timename = "PM";
|
||||
pit_init();
|
||||
cpu_khz = pit_calibrate_tsc();
|
||||
#endif
|
||||
} else {
|
||||
pit_init();
|
||||
cpu_khz = pit_calibrate_tsc();
|
||||
timename = "PIT";
|
||||
}
|
||||
|
||||
vxtime.mode = VXTIME_TSC;
|
||||
vxtime.quot = (USEC_PER_SEC << US_SCALE) / vxtime_hz;
|
||||
vxtime.tsc_quot = (USEC_PER_MSEC << US_SCALE) / cpu_khz;
|
||||
vxtime.last_tsc = get_cycles_sync();
|
||||
set_cyc2ns_scale(cpu_khz);
|
||||
setup_irq(0, &irq0);
|
||||
|
||||
#ifndef CONFIG_SMP
|
||||
time_init_gtod();
|
||||
#endif
|
||||
}
|
||||
|
||||
/*
|
||||
* Decide what mode gettimeofday should use.
|
||||
*/
|
||||
void time_init_gtod(void)
|
||||
{
|
||||
char *timetype;
|
||||
|
||||
if (unsynchronized_tsc())
|
||||
notsc = 1;
|
||||
mark_tsc_unstable();
|
||||
|
||||
if (cpu_has(&boot_cpu_data, X86_FEATURE_RDTSCP))
|
||||
vgetcpu_mode = VGETCPU_RDTSCP;
|
||||
else
|
||||
vgetcpu_mode = VGETCPU_LSL;
|
||||
|
||||
if (hpet_address && notsc) {
|
||||
timetype = hpet_use_timer ? "HPET" : "PIT/HPET";
|
||||
if (hpet_use_timer)
|
||||
vxtime.last = hpet_readl(HPET_T0_CMP) - hpet_tick;
|
||||
else
|
||||
vxtime.last = hpet_readl(HPET_COUNTER);
|
||||
vxtime.mode = VXTIME_HPET;
|
||||
vxtime.hpet_address = hpet_address;
|
||||
do_gettimeoffset = do_gettimeoffset_hpet;
|
||||
#ifdef CONFIG_X86_PM_TIMER
|
||||
/* Using PM for gettimeofday is quite slow, but we have no other
|
||||
choice because the TSC is too unreliable on some systems. */
|
||||
} else if (pmtmr_ioport && !hpet_address && notsc) {
|
||||
timetype = "PM";
|
||||
do_gettimeoffset = do_gettimeoffset_pm;
|
||||
vxtime.mode = VXTIME_PMTMR;
|
||||
sysctl_vsyscall = 0;
|
||||
printk(KERN_INFO "Disabling vsyscall due to use of PM timer\n");
|
||||
#endif
|
||||
} else {
|
||||
timetype = hpet_use_timer ? "HPET/TSC" : "PIT/TSC";
|
||||
vxtime.mode = VXTIME_TSC;
|
||||
}
|
||||
|
||||
printk(KERN_INFO "time.c: Using %ld.%06ld MHz WALL %s GTOD %s timer.\n",
|
||||
vxtime_hz / 1000000, vxtime_hz % 1000000, timename, timetype);
|
||||
set_cyc2ns_scale(cpu_khz);
|
||||
printk(KERN_INFO "time.c: Detected %d.%03d MHz processor.\n",
|
||||
cpu_khz / 1000, cpu_khz % 1000);
|
||||
vxtime.quot = (USEC_PER_SEC << US_SCALE) / vxtime_hz;
|
||||
vxtime.tsc_quot = (USEC_PER_MSEC << US_SCALE) / cpu_khz;
|
||||
vxtime.last_tsc = get_cycles_sync();
|
||||
|
||||
set_cyc2ns_scale(cpu_khz);
|
||||
setup_irq(0, &irq0);
|
||||
}
|
||||
|
||||
__setup("report_lost_ticks", time_setup);
|
||||
|
||||
static long clock_cmos_diff;
|
||||
static unsigned long sleep_start;
|
||||
|
|
@ -688,20 +412,8 @@ static int timer_resume(struct sys_device *dev)
|
|||
write_seqlock_irqsave(&xtime_lock,flags);
|
||||
xtime.tv_sec = sec;
|
||||
xtime.tv_nsec = 0;
|
||||
if (vxtime.mode == VXTIME_HPET) {
|
||||
if (hpet_use_timer)
|
||||
vxtime.last = hpet_readl(HPET_T0_CMP) - hpet_tick;
|
||||
else
|
||||
vxtime.last = hpet_readl(HPET_COUNTER);
|
||||
#ifdef CONFIG_X86_PM_TIMER
|
||||
} else if (vxtime.mode == VXTIME_PMTMR) {
|
||||
pmtimer_resume();
|
||||
#endif
|
||||
} else
|
||||
vxtime.last_tsc = get_cycles_sync();
|
||||
write_sequnlock_irqrestore(&xtime_lock,flags);
|
||||
jiffies += sleep_length;
|
||||
monotonic_base += sleep_length * (NSEC_PER_SEC/HZ);
|
||||
write_sequnlock_irqrestore(&xtime_lock,flags);
|
||||
touch_softlockup_watchdog();
|
||||
return 0;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -9,32 +9,11 @@
|
|||
|
||||
#include <asm/timex.h>
|
||||
|
||||
int notsc __initdata = 0;
|
||||
static int notsc __initdata = 0;
|
||||
|
||||
unsigned int cpu_khz; /* TSC clocks / usec, not used here */
|
||||
EXPORT_SYMBOL(cpu_khz);
|
||||
|
||||
/*
|
||||
* do_gettimeoffset() returns microseconds since last timer interrupt was
|
||||
* triggered by hardware. A memory read of HPET is slower than a register read
|
||||
* of TSC, but much more reliable. It's also synchronized to the timer
|
||||
* interrupt. Note that do_gettimeoffset() may return more than hpet_tick, if a
|
||||
* timer interrupt has happened already, but vxtime.trigger wasn't updated yet.
|
||||
* This is not a problem, because jiffies hasn't updated either. They are bound
|
||||
* together by xtime_lock.
|
||||
*/
|
||||
|
||||
unsigned int do_gettimeoffset_tsc(void)
|
||||
{
|
||||
unsigned long t;
|
||||
unsigned long x;
|
||||
t = get_cycles_sync();
|
||||
if (t < vxtime.last_tsc)
|
||||
t = vxtime.last_tsc; /* hack */
|
||||
x = ((t - vxtime.last_tsc) * vxtime.tsc_quot) >> US_SCALE;
|
||||
return x;
|
||||
}
|
||||
|
||||
static unsigned int cyc2ns_scale __read_mostly;
|
||||
|
||||
void set_cyc2ns_scale(unsigned long khz)
|
||||
|
|
@ -42,7 +21,7 @@ void set_cyc2ns_scale(unsigned long khz)
|
|||
cyc2ns_scale = (NSEC_PER_MSEC << NS_SCALE) / khz;
|
||||
}
|
||||
|
||||
unsigned long long cycles_2_ns(unsigned long long cyc)
|
||||
static unsigned long long cycles_2_ns(unsigned long long cyc)
|
||||
{
|
||||
return (cyc * cyc2ns_scale) >> NS_SCALE;
|
||||
}
|
||||
|
|
@ -61,6 +40,12 @@ unsigned long long sched_clock(void)
|
|||
return cycles_2_ns(a);
|
||||
}
|
||||
|
||||
static int tsc_unstable;
|
||||
|
||||
static inline int check_tsc_unstable(void)
|
||||
{
|
||||
return tsc_unstable;
|
||||
}
|
||||
#ifdef CONFIG_CPU_FREQ
|
||||
|
||||
/* Frequency scaling support. Adjust the TSC based timer when the cpu frequency
|
||||
|
|
@ -89,24 +74,6 @@ static void handle_cpufreq_delayed_get(struct work_struct *v)
|
|||
cpufreq_delayed_issched = 0;
|
||||
}
|
||||
|
||||
/* if we notice lost ticks, schedule a call to cpufreq_get() as it tries
|
||||
* to verify the CPU frequency the timing core thinks the CPU is running
|
||||
* at is still correct.
|
||||
*/
|
||||
void cpufreq_delayed_get(void)
|
||||
{
|
||||
static int warned;
|
||||
if (cpufreq_init && !cpufreq_delayed_issched) {
|
||||
cpufreq_delayed_issched = 1;
|
||||
if (!warned) {
|
||||
warned = 1;
|
||||
printk(KERN_DEBUG "Losing some ticks... "
|
||||
"checking if CPU frequency changed.\n");
|
||||
}
|
||||
schedule_work(&cpufreq_delayed_get_work);
|
||||
}
|
||||
}
|
||||
|
||||
static unsigned int ref_freq = 0;
|
||||
static unsigned long loops_per_jiffy_ref = 0;
|
||||
|
||||
|
|
@ -142,7 +109,7 @@ static int time_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
|
|||
|
||||
cpu_khz = cpufreq_scale(cpu_khz_ref, ref_freq, freq->new);
|
||||
if (!(freq->flags & CPUFREQ_CONST_LOOPS))
|
||||
vxtime.tsc_quot = (USEC_PER_MSEC << US_SCALE) / cpu_khz;
|
||||
mark_tsc_unstable();
|
||||
}
|
||||
|
||||
set_cyc2ns_scale(cpu_khz_ref);
|
||||
|
|
@ -169,12 +136,6 @@ core_initcall(cpufreq_tsc);
|
|||
|
||||
static int tsc_unstable = 0;
|
||||
|
||||
void mark_tsc_unstable(void)
|
||||
{
|
||||
tsc_unstable = 1;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(mark_tsc_unstable);
|
||||
|
||||
/*
|
||||
* Make an educated guess if the TSC is trustworthy and synchronized
|
||||
* over all CPUs.
|
||||
|
|
@ -210,3 +171,49 @@ int __init notsc_setup(char *s)
|
|||
}
|
||||
|
||||
__setup("notsc", notsc_setup);
|
||||
|
||||
|
||||
/* clock source code: */
|
||||
static cycle_t read_tsc(void)
|
||||
{
|
||||
cycle_t ret = (cycle_t)get_cycles_sync();
|
||||
return ret;
|
||||
}
|
||||
|
||||
static struct clocksource clocksource_tsc = {
|
||||
.name = "tsc",
|
||||
.rating = 300,
|
||||
.read = read_tsc,
|
||||
.mask = CLOCKSOURCE_MASK(64),
|
||||
.shift = 22,
|
||||
.flags = CLOCK_SOURCE_IS_CONTINUOUS |
|
||||
CLOCK_SOURCE_MUST_VERIFY,
|
||||
};
|
||||
|
||||
void mark_tsc_unstable(void)
|
||||
{
|
||||
if (!tsc_unstable) {
|
||||
tsc_unstable = 1;
|
||||
/* Change only the rating, when not registered */
|
||||
if (clocksource_tsc.mult)
|
||||
clocksource_change_rating(&clocksource_tsc, 0);
|
||||
else
|
||||
clocksource_tsc.rating = 0;
|
||||
}
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(mark_tsc_unstable);
|
||||
|
||||
static int __init init_tsc_clocksource(void)
|
||||
{
|
||||
if (!notsc) {
|
||||
clocksource_tsc.mult = clocksource_khz2mult(cpu_khz,
|
||||
clocksource_tsc.shift);
|
||||
if (check_tsc_unstable())
|
||||
clocksource_tsc.rating = 0;
|
||||
|
||||
return clocksource_register(&clocksource_tsc);
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
module_init(init_tsc_clocksource);
|
||||
|
|
|
|||
|
|
@ -117,7 +117,7 @@ __setup("hcheck_reboot", hangcheck_parse_reboot);
|
|||
__setup("hcheck_dump_tasks", hangcheck_parse_dump_tasks);
|
||||
#endif /* not MODULE */
|
||||
|
||||
#if defined(CONFIG_X86_64) || defined(CONFIG_S390)
|
||||
#if defined(CONFIG_S390)
|
||||
# define HAVE_MONOTONIC
|
||||
# define TIMER_FREQ 1000000000ULL
|
||||
#elif defined(CONFIG_IA64)
|
||||
|
|
|
|||
|
|
@ -45,11 +45,9 @@ extern u32 pmtmr_ioport;
|
|||
#else
|
||||
#define pmtmr_ioport 0
|
||||
#endif
|
||||
extern unsigned long long monotonic_base;
|
||||
extern int sysctl_vsyscall;
|
||||
extern int nohpet;
|
||||
extern unsigned long vxtime_hz;
|
||||
extern void time_init_gtod(void);
|
||||
|
||||
extern void early_printk(const char *fmt, ...) __attribute__((format(printf,1,2)));
|
||||
|
||||
|
|
|
|||
|
|
@ -28,9 +28,6 @@ extern int read_current_timer(unsigned long *timer_value);
|
|||
#define US_SCALE 32 /* 2^32, arbitralrily chosen */
|
||||
|
||||
extern struct vxtime_data vxtime;
|
||||
|
||||
extern unsigned int do_gettimeoffset_hpet(void);
|
||||
extern unsigned int do_gettimeoffset_tsc(void);
|
||||
extern void mark_tsc_unstable(void);
|
||||
extern void set_cyc2ns_scale(unsigned long khz);
|
||||
extern int notsc;
|
||||
#endif
|
||||
|
|
|
|||
Loading…
Reference in New Issue