cregit-Linux how code gets into the kernel

Release 4.14 arch/powerpc/kernel/time.c

/*
 * Common time routines among all ppc machines.
 *
 * Written by Cort Dougan (cort@cs.nmt.edu) to merge
 * Paul Mackerras' version and mine for PReP and Pmac.
 * MPC8xx/MBX changes by Dan Malek (dmalek@jlc.net).
 * Converted for 64-bit by Mike Corrigan (mikejc@us.ibm.com)
 *
 * First round of bugfixes by Gabriel Paubert (paubert@iram.es)
 * to make clock more stable (2.4.0-test5). The only thing
 * that this code assumes is that the timebases have been synchronized
 * by firmware on SMP and are never stopped (never do sleep
 * on SMP then, nap and doze are OK).
 * 
 * Speeded up do_gettimeofday by getting rid of references to
 * xtime (which required locks for consistency). (mikejc@us.ibm.com)
 *
 * TODO (not necessarily in this file):
 * - improve precision and reproducibility of timebase frequency
 * measurement at boot time.
 * - for astronomical applications: add a new function to get
 * non ambiguous timestamps even around leap seconds. This needs
 * a new timestamp format and a good name.
 *
 * 1997-09-10  Updated NTP code according to technical memorandum Jan '96
 *             "A Kernel Model for Precision Timekeeping" by Dave Mills
 *
 *      This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      as published by the Free Software Foundation; either version
 *      2 of the License, or (at your option) any later version.
 */

#include <linux/errno.h>
#include <linux/export.h>
#include <linux/sched.h>
#include <linux/sched/clock.h>
#include <linux/kernel.h>
#include <linux/param.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/timex.h>
#include <linux/kernel_stat.h>
#include <linux/time.h>
#include <linux/clockchips.h>
#include <linux/init.h>
#include <linux/profile.h>
#include <linux/cpu.h>
#include <linux/security.h>
#include <linux/percpu.h>
#include <linux/rtc.h>
#include <linux/jiffies.h>
#include <linux/posix-timers.h>
#include <linux/irq.h>
#include <linux/delay.h>
#include <linux/irq_work.h>
#include <linux/clk-provider.h>
#include <linux/suspend.h>
#include <linux/rtc.h>
#include <linux/sched/cputime.h>
#include <linux/processor.h>
#include <asm/trace.h>

#include <asm/io.h>
#include <asm/nvram.h>
#include <asm/cache.h>
#include <asm/machdep.h>
#include <linux/uaccess.h>
#include <asm/time.h>
#include <asm/prom.h>
#include <asm/irq.h>
#include <asm/div64.h>
#include <asm/smp.h>
#include <asm/vdso_datapage.h>
#include <asm/firmware.h>
#include <asm/asm-prototypes.h>

/* powerpc clocksource/clockevent code */

#include <linux/clockchips.h>
#include <linux/timekeeper_internal.h>

static u64 rtc_read(struct clocksource *);

static struct clocksource clocksource_rtc = {
	.name         = "rtc",
	.rating       = 400,
	.flags        = CLOCK_SOURCE_IS_CONTINUOUS,
	.mask         = CLOCKSOURCE_MASK(64),
	.read         = rtc_read,
};

static u64 timebase_read(struct clocksource *);

static struct clocksource clocksource_timebase = {
	.name         = "timebase",
	.rating       = 400,
	.flags        = CLOCK_SOURCE_IS_CONTINUOUS,
	.mask         = CLOCKSOURCE_MASK(64),
	.read         = timebase_read,
};


#define DECREMENTER_DEFAULT_MAX 0x7FFFFFFF

u64 decrementer_max = DECREMENTER_DEFAULT_MAX;

static int decrementer_set_next_event(unsigned long evt,
				      struct clock_event_device *dev);
static int decrementer_shutdown(struct clock_event_device *evt);


struct clock_event_device decrementer_clockevent = {
	.name			= "decrementer",
	.rating			= 200,
	.irq			= 0,
	.set_next_event		= decrementer_set_next_event,
	.set_state_shutdown	= decrementer_shutdown,
	.tick_resume		= decrementer_shutdown,
	.features		= CLOCK_EVT_FEAT_ONESHOT |
				  CLOCK_EVT_FEAT_C3STOP,
};

EXPORT_SYMBOL(decrementer_clockevent);

DEFINE_PER_CPU(u64, decrementers_next_tb);
static DEFINE_PER_CPU(struct clock_event_device, decrementers);


#define XSEC_PER_SEC (1024*1024)

#ifdef CONFIG_PPC64

#define SCALE_XSEC(xsec, max)	(((xsec) * max) / XSEC_PER_SEC)
#else
/* compute ((xsec << 12) * max) >> 32 */

#define SCALE_XSEC(xsec, max)	mulhwu((xsec) << 12, max)
#endif


unsigned long tb_ticks_per_jiffy;

unsigned long tb_ticks_per_usec = 100; 
/* sane default */

EXPORT_SYMBOL(tb_ticks_per_usec);

unsigned long tb_ticks_per_sec;

EXPORT_SYMBOL(tb_ticks_per_sec);	
/* for cputime_t conversions */


DEFINE_SPINLOCK(rtc_lock);

EXPORT_SYMBOL_GPL(rtc_lock);


static u64 tb_to_ns_scale __read_mostly;

static unsigned tb_to_ns_shift __read_mostly;

static u64 boot_tb __read_mostly;

extern struct timezone sys_tz;

static long timezone_offset;


unsigned long ppc_proc_freq;

EXPORT_SYMBOL_GPL(ppc_proc_freq);

unsigned long ppc_tb_freq;

EXPORT_SYMBOL_GPL(ppc_tb_freq);

#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
/*
 * Factor for converting from cputime_t (timebase ticks) to
 * microseconds. This is stored as 0.64 fixed-point binary fraction.
 */

u64 __cputime_usec_factor;

EXPORT_SYMBOL(__cputime_usec_factor);

#ifdef CONFIG_PPC_SPLPAR

void (*dtl_consumer)(struct dtl_entry *, u64);
#endif

#ifdef CONFIG_PPC64

#define get_accounting(tsk)	(&get_paca()->accounting)
#else

#define get_accounting(tsk)	(&task_thread_info(tsk)->accounting)
#endif


static void calc_cputime_factors(void) { struct div_result res; div128_by_32(1000000, 0, tb_ticks_per_sec, &res); __cputime_usec_factor = res.result_low; }

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Paul Mackerras2893.33%150.00%
Andreas Schwab26.67%150.00%
Total30100.00%2100.00%

/* * Read the SPURR on systems that have it, otherwise the PURR, * or if that doesn't exist return the timebase value passed in. */
static unsigned long read_spurr(unsigned long tb) { if (cpu_has_feature(CPU_FTR_SPURR)) return mfspr(SPRN_SPURR); if (cpu_has_feature(CPU_FTR_PURR)) return mfspr(SPRN_PURR); return tb; }

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Paul Mackerras3690.00%266.67%
Christophe Leroy410.00%133.33%
Total40100.00%3100.00%

#ifdef CONFIG_PPC_SPLPAR /* * Scan the dispatch trace log and count up the stolen time. * Should be called with interrupts disabled. */
static u64 scan_dispatch_log(u64 stop_tb) { u64 i = local_paca->dtl_ridx; struct dtl_entry *dtl = local_paca->dtl_curr; struct dtl_entry *dtl_end = local_paca->dispatch_log_end; struct lppaca *vpa = local_paca->lppaca_ptr; u64 tb_delta; u64 stolen = 0; u64 dtb; if (!dtl) return 0; if (i == be64_to_cpu(vpa->dtl_idx)) return 0; while (i < be64_to_cpu(vpa->dtl_idx)) { dtb = be64_to_cpu(dtl->timebase); tb_delta = be32_to_cpu(dtl->enqueue_to_dispatch_time) + be32_to_cpu(dtl->ready_to_enqueue_time); barrier(); if (i + N_DISPATCH_LOG < be64_to_cpu(vpa->dtl_idx)) { /* buffer has overflowed */ i = be64_to_cpu(vpa->dtl_idx) - N_DISPATCH_LOG; dtl = local_paca->dispatch_log + (i % N_DISPATCH_LOG); continue; } if (dtb > stop_tb) break; if (dtl_consumer) dtl_consumer(dtl, i); stolen += tb_delta; ++i; ++dtl; if (dtl == dtl_end) dtl = local_paca->dispatch_log; } local_paca->dtl_ridx = i; local_paca->dtl_curr = dtl; return stolen; }

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Paul Mackerras15874.53%233.33%
Anton Blanchard4018.87%350.00%
Michael Neuling146.60%116.67%
Total212100.00%6100.00%

/* * Accumulate stolen time by scanning the dispatch trace log. * Called on entry from user mode. */
void accumulate_stolen_time(void) { u64 sst, ust; u8 save_soft_enabled = local_paca->soft_enabled; struct cpu_accounting_data *acct = &local_paca->accounting; /* We are called early in the exception entry, before * soft/hard_enabled are sync'ed to the expected state * for the exception. We are hard disabled but the PACA * needs to reflect that so various debug stuff doesn't * complain */ local_paca->soft_enabled = 0; sst = scan_dispatch_log(acct->starttime_user); ust = scan_dispatch_log(acct->starttime); acct->stime -= sst; acct->utime -= ust; acct->steal_time += ust + sst; local_paca->soft_enabled = save_soft_enabled; }

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Paul Mackerras3138.75%225.00%
Tejun Heo2025.00%112.50%
Christophe Leroy1417.50%112.50%
Milton D. Miller II67.50%112.50%
Michael Neuling56.25%112.50%
Frédéric Weisbecker45.00%225.00%
Total80100.00%8100.00%


static inline u64 calculate_stolen_time(u64 stop_tb) { if (get_paca()->dtl_ridx != be64_to_cpu(get_lppaca()->dtl_idx)) return scan_dispatch_log(stop_tb); return 0; }

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Paul Mackerras2367.65%233.33%
Anton Blanchard411.76%116.67%
Frédéric Weisbecker38.82%116.67%
Milton D. Miller II38.82%116.67%
Michael Neuling12.94%116.67%
Total34100.00%6100.00%

#else /* CONFIG_PPC_SPLPAR */
static inline u64 calculate_stolen_time(u64 stop_tb) { return 0; }

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Paul Mackerras13100.00%2100.00%
Total13100.00%2100.00%

#endif /* CONFIG_PPC_SPLPAR */ /* * Account time for a transition between system, hard irq * or soft irq state. */
static unsigned long vtime_delta(struct task_struct *tsk, unsigned long *stime_scaled, unsigned long *steal_time) { unsigned long now, nowscaled, deltascaled; unsigned long stime; unsigned long utime, utime_scaled; struct cpu_accounting_data *acct = get_accounting(tsk); WARN_ON_ONCE(!irqs_disabled()); now = mftb(); nowscaled = read_spurr(now); stime = now - acct->starttime; acct->starttime = now; deltascaled = nowscaled - acct->startspurr; acct->startspurr = nowscaled; *steal_time = calculate_stolen_time(now); utime = acct->utime - acct->utime_sspurr; acct->utime_sspurr = acct->utime; /* * Because we don't read the SPURR on every kernel entry/exit, * deltascaled includes both user and system SPURR ticks. * Apportion these ticks to system SPURR ticks and user * SPURR ticks in the same ratio as the system time (delta) * and user time (udelta) values obtained from the timebase * over the same interval. The system ticks get accounted here; * the user ticks get saved up in paca->user_time_scaled to be * used by account_process_tick. */ *stime_scaled = stime; utime_scaled = utime; if (deltascaled != stime + utime) { if (utime) { *stime_scaled = deltascaled * stime / (stime + utime); utime_scaled = deltascaled - *stime_scaled; } else { *stime_scaled = deltascaled; } } acct->utime_scaled += utime_scaled; return stime; }

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Paul Mackerras10355.38%222.22%
Frédéric Weisbecker5227.96%444.44%
Christophe Leroy2915.59%111.11%
Martin Schwidefsky10.54%111.11%
Nathan T. Lynch10.54%111.11%
Total186100.00%9100.00%


void vtime_account_system(struct task_struct *tsk) { unsigned long stime, stime_scaled, steal_time; struct cpu_accounting_data *acct = get_accounting(tsk); stime = vtime_delta(tsk, &stime_scaled, &steal_time); stime -= min(stime, steal_time); acct->steal_time += steal_time; if ((tsk->flags & PF_VCPU) && !irq_count()) { acct->gtime += stime; acct->utime_scaled += stime_scaled; } else { if (hardirq_count()) acct->hardirq_time += stime; else if (in_serving_softirq()) acct->softirq_time += stime; else acct->stime += stime; acct->stime_scaled += stime_scaled; } }

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Frédéric Weisbecker10686.18%337.50%
Paul Mackerras108.13%225.00%
Stanislaw Gruszka43.25%112.50%
Christophe Leroy21.63%112.50%
Martin Schwidefsky10.81%112.50%
Total123100.00%8100.00%

EXPORT_SYMBOL_GPL(vtime_account_system);
void vtime_account_idle(struct task_struct *tsk) { unsigned long stime, stime_scaled, steal_time; struct cpu_accounting_data *acct = get_accounting(tsk); stime = vtime_delta(tsk, &stime_scaled, &steal_time); acct->idle_time += stime + steal_time; }

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Frédéric Weisbecker4285.71%342.86%
Paul Mackerras36.12%228.57%
Christophe Leroy24.08%114.29%
Martin Schwidefsky24.08%114.29%
Total49100.00%7100.00%

/* * Account the whole cputime accumulated in the paca * Must be called with interrupts disabled. * Assumes that vtime_account_system/idle() has been called * recently (i.e. since the last entry from usermode) so that * get_paca()->user_time_scaled is up to date. */
void vtime_flush(struct task_struct *tsk) { struct cpu_accounting_data *acct = get_accounting(tsk); if (acct->utime) account_user_time(tsk, cputime_to_nsecs(acct->utime)); if (acct->utime_scaled) tsk->utimescaled += cputime_to_nsecs(acct->utime_scaled); if (acct->gtime) account_guest_time(tsk, cputime_to_nsecs(acct->gtime)); if (acct->steal_time) account_steal_time(cputime_to_nsecs(acct->steal_time)); if (acct->idle_time) account_idle_time(cputime_to_nsecs(acct->idle_time)); if (acct->stime) account_system_index_time(tsk, cputime_to_nsecs(acct->stime), CPUTIME_SYSTEM); if (acct->stime_scaled) tsk->stimescaled += cputime_to_nsecs(acct->stime_scaled); if (acct->hardirq_time) account_system_index_time(tsk, cputime_to_nsecs(acct->hardirq_time), CPUTIME_IRQ); if (acct->softirq_time) account_system_index_time(tsk, cputime_to_nsecs(acct->softirq_time), CPUTIME_SOFTIRQ); acct->utime = 0; acct->utime_scaled = 0; acct->utime_sspurr = 0; acct->gtime = 0; acct->steal_time = 0; acct->idle_time = 0; acct->stime = 0; acct->stime_scaled = 0; acct->hardirq_time = 0; acct->softirq_time = 0; }

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Frédéric Weisbecker19680.99%857.14%
Paul Mackerras2711.16%214.29%
Christophe Leroy156.20%17.14%
Stanislaw Gruszka20.83%17.14%
Stephen Rothwell10.41%17.14%
Nathan T. Lynch10.41%17.14%
Total242100.00%14100.00%

#ifdef CONFIG_PPC32 /* * Called from the context switch with interrupts disabled, to charge all * accumulated times to the current process, and to prepare accounting on * the next process. */
void arch_vtime_task_switch(struct task_struct *prev) { struct cpu_accounting_data *acct = get_accounting(current); acct->starttime = get_accounting(prev)->starttime; acct->startspurr = get_accounting(prev)->startspurr; }

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Christophe Leroy3378.57%150.00%
Frédéric Weisbecker921.43%150.00%
Total42100.00%2100.00%

#endif /* CONFIG_PPC32 */ #else /* ! CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */ #define calc_cputime_factors() #endif
void __delay(unsigned long loops) { unsigned long start; int diff; spin_begin(); if (__USE_RTC()) { start = get_rtcl(); do { /* the RTCL register wraps at 1000000000 */ diff = get_rtcl() - start; if (diff < 0) diff += 1000000000; spin_cpu_relax(); } while (diff < loops); } else { start = get_tbl(); while (get_tbl() - start < loops) spin_cpu_relax(); } spin_end(); }

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Paul Mackerras7689.41%150.00%
Nicholas Piggin910.59%150.00%
Total85100.00%2100.00%

EXPORT_SYMBOL(__delay);
void udelay(unsigned long usecs) { __delay(tb_ticks_per_usec * usecs); }

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Paul Mackerras16100.00%1100.00%
Total16100.00%1100.00%

EXPORT_SYMBOL(udelay); #ifdef CONFIG_SMP
unsigned long profile_pc(struct pt_regs *regs) { unsigned long pc = instruction_pointer(regs); if (in_lock_functions(pc)) return regs->link; return pc; }

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Zwane Mwaikambo1440.00%120.00%
Tony Breeds1131.43%120.00%
Anton Blanchard822.86%240.00%
Paul Mackerras25.71%120.00%
Total35100.00%5100.00%

EXPORT_SYMBOL(profile_pc); #endif #ifdef CONFIG_IRQ_WORK /* * 64-bit uses a byte in the PACA, 32-bit uses a per-cpu variable... */ #ifdef CONFIG_PPC64
static inline unsigned long test_irq_work_pending(void) { unsigned long x; asm volatile("lbz %0,%1(13)" : "=r" (x) : "i" (offsetof(struct paca_struct, irq_work_pending))); return x; }

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Paul Mackerras1890.00%266.67%
Peter Zijlstra210.00%133.33%
Total20100.00%3100.00%


static inline void set_irq_work_pending_flag(void) { asm volatile("stb %0,%1(13)" : : "r" (1), "i" (offsetof(struct paca_struct, irq_work_pending))); }

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Paul Mackerras1083.33%266.67%
Peter Zijlstra216.67%133.33%
Total12100.00%3100.00%


static inline void clear_irq_work_pending(void) { asm volatile("stb %0,%1(13)" : : "r" (0), "i" (offsetof(struct paca_struct, irq_work_pending))); }

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Total12100.00%2100.00%

#else /* 32-bit */ DEFINE_PER_CPU(u8, irq_work_pending); #define set_irq_work_pending_flag() __this_cpu_write(irq_work_pending, 1) #define test_irq_work_pending() __this_cpu_read(irq_work_pending) #define clear_irq_work_pending() __this_cpu_write(irq_work_pending, 0) #endif /* 32 vs 64 bit */
void arch_irq_work_raise(void) { preempt_disable(); set_irq_work_pending_flag(); set_dec(1); preempt_enable(); }

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Paul Mackerras1990.48%133.33%
Peter Zijlstra29.52%266.67%
Total21100.00%3100.00%

#else /* CONFIG_IRQ_WORK */ #define test_irq_work_pending() 0 #define clear_irq_work_pending() #endif /* CONFIG_IRQ_WORK */
static void __timer_interrupt(void) { struct pt_regs *regs = get_irq_regs(); u64 *next_tb = this_cpu_ptr(&decrementers_next_tb); struct clock_event_device *evt = this_cpu_ptr(&decrementers); u64 now; trace_timer_interrupt_entry(regs); if (test_irq_work_pending()) { clear_irq_work_pending(); irq_work_run(); } now = get_tb_or_rtc(); if (now >= *next_tb) { *next_tb = ~(u64)0; if (evt->event_handler) evt->event_handler(evt); __this_cpu_inc(irq_stat.timer_irqs_event); } else { now = *next_tb - now; if (now <= decrementer_max) set_dec(now); /* We may have raced with new irq work */ if (test_irq_work_pending()) set_dec(1); __this_cpu_inc(irq_stat.timer_irqs_others); } #ifdef CONFIG_PPC64 /* collect purr register values often, for accurate calculations */ if (firmware_has_feature(FW_FEATURE_SPLPAR)) { struct cpu_usage *cu = this_cpu_ptr(&cpu_usage_array); cu->current_tb = mfspr(SPRN_PURR); } #endif trace_timer_interrupt_exit(regs); }

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Paul Mackerras8346.11%522.73%
Anton Blanchard2111.67%418.18%
Tony Breeds126.67%14.55%
Benjamin Herrenschmidt116.11%14.55%
Fan Du105.56%14.55%
Li Zhong105.56%14.55%
Christoph Lameter105.56%14.55%
Preeti U. Murthy73.89%14.55%
David Howells42.22%14.55%
Stephen Rothwell31.67%14.55%
Peter Zijlstra31.67%14.55%
Milton D. Miller II31.67%14.55%
Nathan T. Lynch10.56%14.55%
Oliver O'Halloran10.56%14.55%
Kumar Gala10.56%14.55%
Total180100.00%22100.00%

/* * timer_interrupt - gets called when the decrementer overflows, * with interrupts disabled. */
void timer_interrupt(struct pt_regs * regs) { struct pt_regs *old_regs; u64 *next_tb = this_cpu_ptr(&decrementers_next_tb); /* Ensure a positive value is written to the decrementer, or else * some CPUs will continue to take decrementer exceptions. */ set_dec(decrementer_max); /* Some implementations of hotplug will get timer interrupts while * offline, just ignore these and we also need to set * decrementers_next_tb as MAX to make sure __check_irq_replay * don't replay timer interrupt when return, otherwise we'll trap * here infinitely :( */ if (!cpu_online(smp_processor_id())) { *next_tb = ~(u64)0; return; } /* Conditionally hard-enable interrupts now that the DEC has been * bumped to its maximum value */ may_hard_irq_enable(); #if defined(CONFIG_PPC32) && defined(CONFIG_PPC_PMAC) if (atomic_read(&ppc_n_lost_interrupts) != 0) do_IRQ(regs); #endif old_regs = set_irq_regs(regs); irq_enter(); __timer_interrupt(); irq_exit(); set_irq_regs(old_regs); }

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Preeti U. Murthy9387.74%114.29%
David Howells54.72%114.29%
Anton Blanchard43.77%228.57%
Christoph Lameter21.89%114.29%
Oliver O'Halloran10.94%114.29%
Paul Bolle10.94%114.29%
Total106100.00%7100.00%

EXPORT_SYMBOL(timer_interrupt); /* * Hypervisor decrementer interrupts shouldn't occur but are sometimes * left pending on exit from a KVM guest. We don't need to do anything * to clear them, as they are edge-triggered. */
void hdec_interrupt(struct pt_regs *regs) { }

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#ifdef CONFIG_SUSPEND
static void generic_suspend_disable_irqs(void) { /* Disable the decrementer, so that it doesn't interfere * with suspending. */ set_dec(decrementer_max); local_irq_disable(); set_dec(decrementer_max); }

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Scott Wood1986.36%133.33%
Oliver O'Halloran29.09%133.33%
Paul Mackerras14.55%133.33%
Total22100.00%3100.00%


static void generic_suspend_enable_irqs(void) { local_irq_enable(); }

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Paul Mackerras19.09%150.00%
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/* Overrides the weak version in kernel/power/main.c */
void arch_suspend_disable_irqs(void) { if (ppc_md.suspend_disable_irqs) ppc_md.suspend_disable_irqs(); generic_suspend_disable_irqs(); }

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Scott Wood21100.00%1100.00%
Total21100.00%1100.00%

/* Overrides the weak version in kernel/power/main.c */
void arch_suspend_enable_irqs(void) { generic_suspend_enable_irqs(); if (ppc_md.suspend_enable_irqs) ppc_md.suspend_enable_irqs(); }

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#endif
unsigned long long tb_to_ns(unsigned long long ticks) { return mulhdu(ticks, tb_to_ns_scale) << tb_to_ns_shift; }

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Paul Mackerras22100.00%1100.00%
Total22100.00%1100.00%

EXPORT_SYMBOL_GPL(tb_to_ns); /* * Scheduler clock - returns current time in nanosec units. * * Note: mulhdu(a, b) (multiply high double unsigned) returns * the high 64 bits of a * b, i.e. (a * b) >> 64, where a and b * are 64-bit unsigned numbers. */
notrace unsigned long long sched_clock(void) { if (__USE_RTC()) return get_rtc(); return mulhdu(get_tb() - boot_tb, tb_to_ns_scale) << tb_to_ns_shift; }

Contributors

PersonTokensPropCommitsCommitProp
Tony Breeds1443.75%116.67%
Andrew Morton928.12%233.33%
Anton Blanchard412.50%116.67%
Paul Mackerras412.50%116.67%
Santosh Sivaraj13.12%116.67%
Total32100.00%6100.00%

#ifdef CONFIG_PPC_PSERIES /* * Running clock - attempts to give a view of time passing for a virtualised * kernels. * Uses the VTB register if available otherwise a next best guess. */
unsigned long long running_clock(void) { /* * Don't read the VTB as a host since KVM does not switch in host * timebase into the VTB when it takes a guest off the CPU, reading the * VTB would result in reading 'last switched out' guest VTB. * * Host kernels are often compiled with CONFIG_PPC_PSERIES checked, it * would be unsafe to rely only on the #ifdef above. */ if (firmware_has_feature(FW_FEATURE_LPAR) && cpu_has_feature(CPU_FTR_ARCH_207S)) return mulhdu(get_vtb() - boot_tb, tb_to_ns_scale) << tb_to_ns_shift; /* * This is a next best approximation without a VTB. * On a host which is running bare metal there should never be any stolen * time and on a host which doesn't do any virtualisation TB *should* equal * VTB so it makes no difference anyway. */ return local_clock() - kcpustat_this_cpu->cpustat[CPUTIME_STEAL]; }

Contributors

PersonTokensPropCommitsCommitProp
Cyril Bur47100.00%1100.00%
Total47100.00%1100.00%

#endif
static int __init get_freq(char *name, int cells, unsigned long *val) { struct device_node *cpu; const __be32 *fp; int found = 0; /* The cpu node should have timebase and clock frequency properties */ cpu = of_find_node_by_type(NULL, "cpu"); if (cpu) { fp = of_get_property(cpu, name, NULL); if (fp) { found = 1; *val = of_read_ulong(fp, cells); } of_node_put(cpu); } return found; }

Contributors

PersonTokensPropCommitsCommitProp
Arnd Bergmann4955.06%116.67%
Anton Blanchard3337.08%233.33%
Paul Mackerras55.62%116.67%
Stephen Rothwell11.12%116.67%
Jeremy Kerr11.12%116.67%
Total89100.00%6100.00%


static void start_cpu_decrementer(void) { #if defined(CONFIG_BOOKE) || defined(CONFIG_40x) unsigned int tcr; /* Clear any pending timer interrupts */ mtspr(SPRN_TSR, TSR_ENW | TSR_WIS | TSR_DIS | TSR_FIS); tcr = mfspr(SPRN_TCR); /* * The watchdog may have already been enabled by u-boot. So leave * TRC[WP] (Watchdog Period) alone. */ tcr &= TCR_WP_MASK; /* Clear all bits except for TCR[WP] */ tcr |= TCR_DIE; /* Enable decrementer */ mtspr(SPRN_TCR, tcr); #endif }

Contributors

PersonTokensPropCommitsCommitProp
Benjamin Herrenschmidt4062.50%133.33%
Ivan Mikhaylov2335.94%133.33%
Anton Blanchard11.56%133.33%
Total64100.00%3100.00%


void __init generic_calibrate_decr(void) { ppc_tb_freq = DEFAULT_TB_FREQ; /* hardcoded default */ if (!get_freq("ibm,extended-timebase-frequency", 2, &ppc_tb_freq) && !get_freq("timebase-frequency", 1, &ppc_tb_freq)) { printk(KERN_ERR "WARNING: Estimating decrementer frequency " "(not found)\n"); } ppc_proc_freq = DEFAULT_PROC_FREQ; /* hardcoded default */ if (!get_freq("ibm,extended-clock-frequency", 2, &ppc_proc_freq) && !get_freq("clock-frequency", 1, &ppc_proc_freq)) { printk(KERN_ERR "WARNING: Estimating processor frequency " "(not found)\n"); } }

Contributors

PersonTokensPropCommitsCommitProp
Anton Blanchard5767.86%150.00%
Arnd Bergmann2732.14%150.00%
Total84100.00%2100.00%


int update_persistent_clock(struct timespec now) { struct rtc_time tm; if (!ppc_md.set_rtc_time) return -ENODEV; to_tm(now.tv_sec + 1 + timezone_offset, &tm); tm.tm_year -= 1900; tm.tm_mon -= 1; return ppc_md.set_rtc_time(&tm); }

Contributors

PersonTokensPropCommitsCommitProp
Tony Breeds5796.61%150.00%
Jason Gunthorpe23.39%150.00%
Total59100.00%2100.00%


static void __read_persistent_clock(struct timespec *ts) { struct rtc_time tm; static int first = 1; ts->tv_nsec = 0; /* XXX this is a litle fragile but will work okay in the short term */ if (first) { first = 0; if (ppc_md.time_init) timezone_offset = ppc_md.time_init(); /* get_boot_time() isn't guaranteed to be safe to call late */ if (ppc_md.get_boot_time) { ts->tv_sec = ppc_md.get_boot_time() - timezone_offset; return; } } if (!ppc_md.get_rtc_time) { ts->tv_sec = 0; return; } ppc_md.get_rtc_time(&tm); ts->tv_sec = mktime(tm.tm_year+1900, tm.tm_mon+1, tm.tm_mday, tm.tm_hour, tm.tm_min, tm.tm_sec); }

Contributors

PersonTokensPropCommitsCommitProp
Paul Mackerras6448.85%120.00%
Tony Breeds3325.19%120.00%
Martin Schwidefsky3224.43%240.00%
Benjamin Herrenschmidt21.53%120.00%
Total131100.00%5100.00%


void read_persistent_clock(struct timespec *ts) { __read_persistent_clock(ts); /* Sanitize it in case real time clock is set below EPOCH */ if (ts->tv_sec < 0)