cregit-Linux how code gets into the kernel

Release 4.14 arch/powerpc/kernel/time.c

Directory: arch/powerpc/kernel
/*
 * 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;
}


Contributors
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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;
}


Contributors
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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;
}


Contributors
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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;
}


Contributors
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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;
}

Contributors
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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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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;
}

Contributors
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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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Paul Mackerras1083.33%150.00%


Peter Zijlstra216.67%150.00%


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);
}

Contributors
PersonTokensPropCommitsCommitProp
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)
{
}


Contributors
PersonTokensPropCommitsCommitProp
Paul Mackerras9100.00%1100.00%


Total9100.00%1100.00%



#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);
}


Contributors
PersonTokensPropCommitsCommitProp
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();
}


Contributors
PersonTokensPropCommitsCommitProp
Scott Wood1090.91%150.00%


Paul Mackerras19.09%150.00%


Total11100.00%2100.00%



/* 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();
}


Contributors
PersonTokensPropCommitsCommitProp
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();
}

Contributors
PersonTokensPropCommitsCommitProp
Scott Wood21100.00%1100.00%


Total21100.00%1100.00%



#endif




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

Contributors
PersonTokensPropCommitsCommitProp
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) {
		ts->tv_sec = 0;
		ts->tv_nsec = 0;
	}
		
}


Contributors
PersonTokensPropCommitsCommitProp
Benjamin Herrenschmidt38100.00%1100.00%


Total38100.00%1100.00%



/* clocksource code */



static notrace u64 rtc_read(struct clocksource *cs)
{
	return (u64)get_rtc();
}


Contributors
PersonTokensPropCommitsCommitProp
Tony Breeds1263.16%125.00%


Magnus Damm421.05%125.00%


Thomas Gleixner210.53%125.00%


Santosh Sivaraj15.26%125.00%


Total19100.00%4100.00%






static notrace u64 timebase_read(struct clocksource *cs)
{
	return (u64)get_tb();
}



Contributors
PersonTokensPropCommitsCommitProp
Tony Breeds1263.16%125.00%


Magnus Damm421.05%125.00%


Thomas Gleixner210.53%125.00%


Santosh Sivaraj15.26%125.00%


Total19100.00%4100.00%






void update_vsyscall(struct timekeeper *tk)
{
	struct timespec xt;
	struct clocksource *clock = tk->tkr_mono.clock;
	u32 mult = tk->tkr_mono.mult;
	u32 shift = tk->tkr_mono.shift;
	u64 cycle_last = tk->tkr_mono.cycle_last;
	u64 new_tb_to_xs, new_stamp_xsec;
	u64 frac_sec;

	if (clock != &clocksource_timebase)
		return;

	xt.tv_sec = tk->xtime_sec;
	xt.tv_nsec = (long)(tk->tkr_mono.xtime_nsec >> tk->tkr_mono.shift);

	/* Make userspace gettimeofday spin until we're done. */
	++vdso_data->tb_update_count;
	smp_mb();

	/*
         * This computes ((2^20 / 1e9) * mult) >> shift as a
         * 0.64 fixed-point fraction.
         * The computation in the else clause below won't overflow
         * (as long as the timebase frequency is >= 1.049 MHz)
         * but loses precision because we lose the low bits of the constant
         * in the shift.  Note that 19342813113834067 ~= 2^(20+64) / 1e9.
         * For a shift of 24 the error is about 0.5e-9, or about 0.5ns
         * over a second.  (Shift values are usually 22, 23 or 24.)
         * For high frequency clocks such as the 512MHz timebase clock
         * on POWER[6789], the mult value is small (e.g. 32768000)
         * and so we can shift the constant by 16 initially
         * (295147905179 ~= 2^(20+64-16) / 1e9) and then do the
         * remaining shifts after the multiplication, which gives a
         * more accurate result (e.g. with mult = 32768000, shift = 24,
         * the error is only about 1.2e-12, or 0.7ns over 10 minutes).
         */
	if (mult <= 62500000 && clock->shift >= 16)
		new_tb_to_xs = ((u64) mult * 295147905179ULL) >> (clock->shift - 16);
	else
		new_tb_to_xs = (u64) mult * (19342813113834067ULL >> clock->shift);

	/*
         * Compute the fractional second in units of 2^-32 seconds.
         * The fractional second is tk->tkr_mono.xtime_nsec >> tk->tkr_mono.shift
         * in nanoseconds, so multiplying that by 2^32 / 1e9 gives
         * it in units of 2^-32 seconds.
         * We assume shift <= 32 because clocks_calc_mult_shift()
         * generates shift values in the range 0 - 32.
         */
	frac_sec = tk->tkr_mono.xtime_nsec << (32 - shift);
	do_div(frac_sec, NSEC_PER_SEC);

	/*
         * Work out new stamp_xsec value for any legacy users of systemcfg.
         * stamp_xsec is in units of 2^-20 seconds.
         */
	new_stamp_xsec = frac_sec >> 12;
	new_stamp_xsec += tk->xtime_sec * XSEC_PER_SEC;

	/*
         * tb_update_count is used to allow the userspace gettimeofday code
         * to assure itself that it sees a consistent view of the tb_to_xs and
         * stamp_xsec variables.  It reads the tb_update_count, then reads
         * tb_to_xs and stamp_xsec and then reads tb_update_count again.  If
         * the two values of tb_update_count match and are even then the
         * tb_to_xs and stamp_xsec values are consistent.  If not, then it
         * loops back and reads them again until this criteria is met.
         */
	vdso_data->tb_orig_stamp = cycle_last;
	vdso_data->stamp_xsec = new_stamp_xsec;
	vdso_data->tb_to_xs = new_tb_to_xs;
	vdso_data->wtom_clock_sec = tk->wall_to_monotonic.tv_sec;
	vdso_data->wtom_clock_nsec = tk->wall_to_monotonic.tv_nsec;
	vdso_data->stamp_xtime = xt;
	vdso_data->stamp_sec_fraction = frac_sec;
	smp_wmb();
	++(vdso_data->tb_update_count);
}


Contributors
PersonTokensPropCommitsCommitProp
Paul Mackerras14155.95%218.18%


John Stultz5019.84%327.27%


Tony Breeds4718.65%19.09%


Thomas Gleixner72.78%327.27%


Anton Blanchard51.98%19.09%


Lin Ming20.79%19.09%


Total252100.00%11100.00%






void update_vsyscall_tz(void)
{
	vdso_data->tz_minuteswest = sys_tz.tz_minuteswest;
	vdso_data->tz_dsttime = sys_tz.tz_dsttime;
}


Contributors
PersonTokensPropCommitsCommitProp
Tony Breeds23100.00%1100.00%


Total23100.00%1100.00%






static void __init clocksource_init(void)
{
	struct clocksource *clock;

	if (__USE_RTC())
		clock = &clocksource_rtc;
	else
		clock = &clocksource_timebase;

	if (clocksource_register_hz(clock, tb_ticks_per_sec)) {
		printk(KERN_ERR "clocksource: %s is already registered\n",
		       clock->name);
		return;
	}

	printk(KERN_INFO "clocksource: %s mult[%x] shift[%d] registered\n",
	       clock->name, clock->mult, clock->shift);
}


Contributors
PersonTokensPropCommitsCommitProp
Tony Breeds6694.29%133.33%


Anton Blanchard34.29%133.33%


Michael Ellerman11.43%133.33%


Total70100.00%3100.00%






static int decrementer_set_next_event(unsigned long evt,
				      struct clock_event_device *dev)
{
	__this_cpu_write(decrementers_next_tb, get_tb_or_rtc() + evt);
	set_dec(evt);

	/* We may have raced with new irq work */
	if (test_irq_work_pending())
		set_dec(1);

	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Tony Breeds2352.27%120.00%


Benjamin Herrenschmidt1125.00%120.00%


Paul Mackerras613.64%120.00%


Christoph Lameter36.82%120.00%


Anton Blanchard12.27%120.00%


Total44100.00%5100.00%






static int decrementer_shutdown(struct clock_event_device *dev)
{
	decrementer_set_next_event(decrementer_max, dev);
	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Tony Breeds1571.43%133.33%


Viresh Kumar523.81%133.33%


Oliver O'Halloran14.76%133.33%


Total21100.00%3100.00%



/* Interrupt handler for the timer broadcast IPI */



void tick_broadcast_ipi_handler(void)
{
	u64 *next_tb = this_cpu_ptr(&decrementers_next_tb);

	*next_tb = get_tb_or_rtc();
	__timer_interrupt();
}


Contributors
PersonTokensPropCommitsCommitProp
Preeti U. Murthy1973.08%133.33%


Srivatsa S. Bhat519.23%133.33%


Christoph Lameter27.69%133.33%


Total26100.00%3100.00%






static void register_decrementer_clockevent(int cpu)
{
	struct clock_event_device *dec = &per_cpu(decrementers, cpu);

	*dec = decrementer_clockevent;
	dec->cpumask = cpumask_of(cpu);

	printk_once(KERN_DEBUG "clockevent: %s mult[%x] shift[%d] cpu[%d]\n",
		    dec->name, dec->mult, dec->shift, cpu);

	clockevents_register_device(dec);
}


Contributors
PersonTokensPropCommitsCommitProp
Tony Breeds5895.08%240.00%


Thomas Gleixner11.64%120.00%


Rusty Russell11.64%120.00%


Anton Blanchard11.64%120.00%


Total61100.00%5100.00%






static void enable_large_decrementer(void)
{
	if (!cpu_has_feature(CPU_FTR_ARCH_300))
		return;

	if (decrementer_max <= DECREMENTER_DEFAULT_MAX)
		return;

	/*
         * If we're running as the hypervisor we need to enable the LD manually
         * otherwise firmware should have done it for us.
         */
	if (cpu_has_feature(CPU_FTR_HVMODE))
		mtspr(SPRN_LPCR, mfspr(SPRN_LPCR) | LPCR_LD);
}


Contributors
PersonTokensPropCommitsCommitProp
Oliver O'Halloran44100.00%1100.00%


Total44100.00%1100.00%






static void __init set_decrementer_max(void)
{
	struct device_node *cpu;
	u32 bits = 32;

	/* Prior to ISAv3 the decrementer is always 32 bit */
	if (!cpu_has_feature(CPU_FTR_ARCH_300))
		return;

	cpu = of_find_node_by_type(NULL, "cpu");

	if (of_property_read_u32(cpu, "ibm,dec-bits", &bits) == 0) {
		if (bits > 64 || bits < 32) {
			pr_warn("time_init: firmware supplied invalid ibm,dec-bits");
			bits = 32;
		}

		/* calculate the signed maximum given this many bits */
		decrementer_max = (1ul << (bits - 1)) - 1;
	}

	of_node_put(cpu);

	pr_info("time_init: %u bit decrementer (max: %llx)\n",
		bits, decrementer_max);
}


Contributors
PersonTokensPropCommitsCommitProp
Oliver O'Halloran104100.00%1100.00%


Total104100.00%1100.00%






static void __init init_decrementer_clockevent(void)
{
	int cpu = smp_processor_id();

	clockevents_calc_mult_shift(&decrementer_clockevent, ppc_tb_freq, 4);

	decrementer_clockevent.max_delta_ns =
		clockevent_delta2ns(decrementer_max, &decrementer_clockevent);
	decrementer_clockevent.max_delta_ticks = decrementer_max;
	decrementer_clockevent.min_delta_ns =
		clockevent_delta2ns(2, &decrementer_clockevent);
	decrementer_clockevent.min_delta_ticks = 2;

	register_decrementer_clockevent(cpu);
}


Contributors
PersonTokensPropCommitsCommitProp
Tony Breeds3857.58%116.67%


Nicolai Stange1218.18%116.67%


Paul Mackerras710.61%116.67%


Anton Blanchard69.09%116.67%


Milton D. Miller II23.03%116.67%


Oliver O'Halloran11.52%116.67%


Total66100.00%6100.00%






void secondary_cpu_time_init(void)
{
	/* Enable and test the large decrementer for this cpu */
	enable_large_decrementer();

	/* Start the decrementer on CPUs that have manual control
         * such as BookE
         */
	start_cpu_decrementer();

	/* FIME: Should make unrelatred change to move snapshot_timebase
         * call here ! */
	register_decrementer_clockevent(smp_processor_id());
}


Contributors
PersonTokensPropCommitsCommitProp
Tony Breeds1463.64%133.33%


Oliver O'Halloran418.18%133.33%


Benjamin Herrenschmidt418.18%133.33%


Total22100.00%3100.00%



/* This function is only called on the boot processor */



void __init time_init(void)
{
	struct div_result res;
	u64 scale;
	unsigned shift;

	if (__USE_RTC()) {
		/* 601 processor: dec counts down by 128 every 128ns */
		ppc_tb_freq = 1000000000;
	} else {
		/* Normal PowerPC with timebase register */
		ppc_md.calibrate_decr();
		printk(KERN_DEBUG "time_init: decrementer frequency = %lu.%.6lu MHz\n",
		       ppc_tb_freq / 1000000, ppc_tb_freq % 1000000);
		printk(KERN_DEBUG "time_init: processor frequency   = %lu.%.6lu MHz\n",
		       ppc_proc_freq / 1000000, ppc_proc_freq % 1000000);
	}

	tb_ticks_per_jiffy = ppc_tb_freq / HZ;
	tb_ticks_per_sec = ppc_tb_freq;
	tb_ticks_per_usec = ppc_tb_freq / 1000000;
	calc_cputime_factors();

	/*
         * Compute scale factor for sched_clock.
         * The calibrate_decr() function has set tb_ticks_per_sec,
         * which is the timebase frequency.
         * We compute 1e9 * 2^64 / tb_ticks_per_sec and interpret
         * the 128-bit result as a 64.64 fixed-point number.
         * We then shift that number right until it is less than 1.0,
         * giving us the scale factor and shift count to use in
         * sched_clock().
         */
	div128_by_32(1000000000, 0, tb_ticks_per_sec, &res);
	scale = res.result_low;
	for (shift = 0; res.result_high != 0; ++shift) {
		scale = (scale >> 1) | (res.result_high << 63);
		res.result_high >>= 1;
	}
	tb_to_ns_scale = scale;
	tb_to_ns_shift = shift;
	/* Save the current timebase to pretty up CONFIG_PRINTK_TIME */
	boot_tb = get_tb_or_rtc();

	/* If platform provided a timezone (pmac), we correct the time */
	if (timezone_offset) {
		sys_tz.tz_minuteswest = -timezone_offset / 60;
		sys_tz.tz_dsttime = 0;
	}

	vdso_data->tb_update_count = 0;
	vdso_data->tb_ticks_per_sec = tb_ticks_per_sec;

	/* initialise and enable the large decrementer (if we have one) */
	set_decrementer_max();
	enable_large_decrementer();

	/* Start the decrementer on CPUs that have manual control
         * such as BookE
         */
	start_cpu_decrementer();

	/* Register the clocksource */
	clocksource_init();

	init_decrementer_clockevent();
	tick_setup_hrtimer_broadcast();

#ifdef CONFIG_COMMON_CLK
	of_clk_init(NULL);
#endif
}



Contributors
PersonTokensPropCommitsCommitProp
Paul Mackerras9643.05%631.58%


Andrew Morton7332.74%15.26%


Anton Blanchard146.28%15.26%


Tony Breeds104.48%315.79%


Kevin Hao104.48%15.26%


Oliver O'Halloran73.14%15.26%


Benjamin Herrenschmidt73.14%315.79%


Preeti U. Murthy31.35%15.26%


Olof Johansson20.90%15.26%


Stephen Rothwell10.45%15.26%


Total223100.00%19100.00%




#define FEBRUARY	2

#define	STARTOFTIME	1970

#define SECDAY		86400L

#define SECYR		(SECDAY * 365)

#define	leapyear(year)		((year) % 4 == 0 && \
                                 ((year) % 100 != 0 || (year) % 400 == 0))

#define	days_in_year(a) 	(leapyear(a) ? 366 : 365)

#define	days_in_month(a) 	(month_days[(a) - 1])


static int month_days[12] = {
	31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
};




void to_tm(int tim, struct rtc_time * tm)
{
	register int    i;
	register long   hms, day;

	day = tim / SECDAY;
	hms = tim % SECDAY;

	/* Hours, minutes, seconds are easy */
	tm->tm_hour = hms / 3600;
	tm->tm_min = (hms % 3600) / 60;
	tm->tm_sec = (hms % 3600) % 60;

	/* Number of years in days */
	for (i = STARTOFTIME; day >= days_in_year(i); i++)
		day -= days_in_year(i);
	tm->tm_year = i;

	/* Number of months in days left */
	if (leapyear(tm->tm_year))
		days_in_month(FEBRUARY) = 29;
	for (i = 1; day >= days_in_month(i); i++)
		day -= days_in_month(i);
	days_in_month(FEBRUARY) = 28;
	tm->tm_mon = i;

	/* Days are what is left over (+1) from all that. */
	tm->tm_mday = day + 1;

	/*
         * No-one uses the day of the week.
         */
	tm->tm_wday = -1;
}

Contributors
PersonTokensPropCommitsCommitProp
Anton Blanchard16296.43%150.00%


Daniel Axtens63.57%150.00%


Total168100.00%2100.00%




EXPORT_SYMBOL(to_tm);

/*
 * Divide a 128-bit dividend by a 32-bit divisor, leaving a 128 bit
 * result.
 */



void div128_by_32(u64 dividend_high, u64 dividend_low,
		  unsigned divisor, struct div_result *dr)
{
	unsigned long a, b, c, d;
	unsigned long w, x, y, z;
	u64 ra, rb, rc;

	a = dividend_high >> 32;
	b = dividend_high & 0xffffffff;
	c = dividend_low >> 32;
	d = dividend_low & 0xffffffff;

	w = a / divisor;
	ra = ((u64)(a - (w * divisor)) << 32) + b;

	rb = ((u64) do_div(ra, divisor) << 32) + c;
	x = ra;

	rc = ((u64) do_div(rb, divisor) << 32) + d;
	y = rb;

	do_div(rc, divisor);
	z = rc;

	dr->result_high = ((u64)w << 32) + x;
	dr->result_low  = ((u64)y << 32) + z;

}


Contributors
PersonTokensPropCommitsCommitProp
Anton Blanchard11261.54%150.00%


Paul Mackerras7038.46%150.00%


Total182100.00%2100.00%



/* We don't need to calibrate delay, we use the CPU timebase for that */



void calibrate_delay(void)
{
	/* Some generic code (such as spinlock debug) use loops_per_jiffy
         * as the number of __delay(1) in a jiffy, so make it so
         */
	loops_per_jiffy = tb_ticks_per_jiffy;
}


Contributors
PersonTokensPropCommitsCommitProp
Benjamin Herrenschmidt12100.00%1100.00%


Total12100.00%1100.00%



#if IS_ENABLED(CONFIG_RTC_DRV_GENERIC)



static int rtc_generic_get_time(struct device *dev, struct rtc_time *tm)
{
	ppc_md.get_rtc_time(tm);
	return rtc_valid_tm(tm);
}


Contributors
PersonTokensPropCommitsCommitProp
Arnd Bergmann29100.00%1100.00%


Total29100.00%1100.00%






static int rtc_generic_set_time(struct device *dev, struct rtc_time *tm)
{
	if (!ppc_md.set_rtc_time)
		return -EOPNOTSUPP;

	if (ppc_md.set_rtc_time(tm) < 0)
		return -EOPNOTSUPP;

	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Arnd Bergmann45100.00%1100.00%


Total45100.00%1100.00%




static const struct rtc_class_ops rtc_generic_ops = {
	.read_time = rtc_generic_get_time,
	.set_time = rtc_generic_set_time,
};




static int __init rtc_init(void)
{
	struct platform_device *pdev;

	if (!ppc_md.get_rtc_time)
		return -ENODEV;

	pdev = platform_device_register_data(NULL, "rtc-generic", -1,
					     &rtc_generic_ops,
					     sizeof(rtc_generic_ops));

	return PTR_ERR_OR_ZERO(pdev);
}


Contributors
PersonTokensPropCommitsCommitProp
Geert Uytterhoeven4180.39%133.33%


Arnd Bergmann917.65%133.33%


Rusty Russell11.96%133.33%


Total51100.00%3100.00%




device_initcall(rtc_init);
#endif

Overall Contributors
PersonTokensPropCommitsCommitProp
Paul Mackerras128929.35%2617.11%


Anton Blanchard63514.46%1912.50%


Tony Breeds60013.66%53.29%


Frédéric Weisbecker4239.63%1610.53%


Arnd Bergmann1884.28%21.32%


Oliver O'Halloran1723.92%10.66%


Benjamin Herrenschmidt1353.07%74.61%


Christophe Leroy1323.01%10.66%


Preeti U. Murthy1282.91%21.32%


Andrew Morton831.89%31.97%


Scott Wood761.73%10.66%


Cyril Bur531.21%10.66%


John Stultz511.16%42.63%


Geert Uytterhoeven451.02%10.66%


Martin Schwidefsky360.82%31.97%


Ivan Mikhaylov230.52%10.66%


Zwane Mwaikambo230.52%10.66%


Michael Neuling220.50%31.97%


Peter Zijlstra210.48%21.32%


Christoph Lameter200.46%10.66%


Tejun Heo200.46%10.66%


Milton D. Miller II170.39%31.97%


Viresh Kumar150.34%10.66%


Thomas Gleixner140.32%42.63%


Magnus Damm140.32%10.66%


Kevin Hao130.30%10.66%


Stephen Rothwell120.27%53.29%


Nicholas Piggin120.27%10.66%


David Howells120.27%10.66%


Nicolai Stange120.27%10.66%


Fan Du100.23%10.66%


Li Zhong100.23%10.66%


Daniel Axtens100.23%31.97%


Srivatsa S. Bhat60.14%10.66%


Stanislaw Gruszka60.14%10.66%


Al Viro50.11%10.66%


Bharat Bhushan50.11%10.66%


Andreas Schwab40.09%10.66%


Ingo Molnar40.09%21.32%


Bob Nelson40.09%10.66%


Nathan T. Lynch30.07%21.32%


Santosh Sivaraj30.07%10.66%


Timur Tabi30.07%10.66%


Michael A. Halcrow30.07%10.66%


David Gibson20.05%10.66%


Paul Gortmaker20.05%21.32%


Olof Johansson20.05%10.66%


Rusty Russell20.05%21.32%


Arnaldo Carvalho de Melo20.05%10.66%


Lin Ming20.05%10.66%


Jason Gunthorpe20.05%10.66%


Michael Ellerman10.02%10.66%


Jeremy Kerr10.02%10.66%


Linus Torvalds10.02%10.66%


Kumar Gala10.02%10.66%


Heiko Schocher10.02%10.66%


Paul Bolle10.02%10.66%


Total4392100.00%152100.00%


Directory: arch/powerpc/kernel



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