Merge branch 'powerpc.cherry-picks' into timers/clocksource
Conflicts: arch/powerpc/kernel/time.c Reason: The powerpc next tree contains two commits which conflict with the timekeeping changes:8fd63a9epowerpc: Rework VDSO gettimeofday to prevent time going backwardsc1aa687dpowerpc: Clean up obsolete code relating to decrementer and timebase John Stultz identified them and provided the conflict resolution. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Thomas Gleixner
commit
47916be4e2
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@ -366,8 +366,5 @@ static inline void log_error(char *buf, unsigned int err_type, int fatal)
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#define machine_late_initcall(mach,fn) __define_machine_initcall(mach,"7",fn,7)
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#define machine_late_initcall_sync(mach,fn) __define_machine_initcall(mach,"7s",fn,7s)
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void generic_suspend_disable_irqs(void);
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void generic_suspend_enable_irqs(void);
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#endif /* __KERNEL__ */
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#endif /* _ASM_POWERPC_MACHDEP_H */
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@ -28,16 +28,12 @@
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extern unsigned long tb_ticks_per_jiffy;
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extern unsigned long tb_ticks_per_usec;
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extern unsigned long tb_ticks_per_sec;
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extern u64 tb_to_xs;
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extern unsigned tb_to_us;
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struct rtc_time;
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extern void to_tm(int tim, struct rtc_time * tm);
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extern void GregorianDay(struct rtc_time *tm);
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extern time_t last_rtc_update;
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extern void generic_calibrate_decr(void);
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extern void wakeup_decrementer(void);
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extern void snapshot_timebase(void);
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extern void set_dec_cpu6(unsigned int val);
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@ -204,9 +200,6 @@ static inline unsigned long tb_ticks_since(unsigned long tstamp)
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extern u64 mulhdu(u64, u64);
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#endif
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extern void smp_space_timers(unsigned int);
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extern unsigned mulhwu_scale_factor(unsigned, unsigned);
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extern void div128_by_32(u64 dividend_high, u64 dividend_low,
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unsigned divisor, struct div_result *dr);
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@ -85,6 +85,7 @@ struct vdso_data {
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__s32 wtom_clock_sec; /* Wall to monotonic clock */
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__s32 wtom_clock_nsec;
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struct timespec stamp_xtime; /* xtime as at tb_orig_stamp */
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__u32 stamp_sec_fraction; /* fractional seconds of stamp_xtime */
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__u32 syscall_map_64[SYSCALL_MAP_SIZE]; /* map of syscalls */
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__u32 syscall_map_32[SYSCALL_MAP_SIZE]; /* map of syscalls */
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};
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@ -105,6 +106,7 @@ struct vdso_data {
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__s32 wtom_clock_sec; /* Wall to monotonic clock */
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__s32 wtom_clock_nsec;
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struct timespec stamp_xtime; /* xtime as at tb_orig_stamp */
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__u32 stamp_sec_fraction; /* fractional seconds of stamp_xtime */
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__u32 syscall_map_32[SYSCALL_MAP_SIZE]; /* map of syscalls */
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__u32 dcache_block_size; /* L1 d-cache block size */
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__u32 icache_block_size; /* L1 i-cache block size */
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@ -342,6 +342,7 @@ int main(void)
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DEFINE(WTOM_CLOCK_SEC, offsetof(struct vdso_data, wtom_clock_sec));
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DEFINE(WTOM_CLOCK_NSEC, offsetof(struct vdso_data, wtom_clock_nsec));
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DEFINE(STAMP_XTIME, offsetof(struct vdso_data, stamp_xtime));
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DEFINE(STAMP_SEC_FRAC, offsetof(struct vdso_data, stamp_sec_fraction));
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DEFINE(CFG_ICACHE_BLOCKSZ, offsetof(struct vdso_data, icache_block_size));
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DEFINE(CFG_DCACHE_BLOCKSZ, offsetof(struct vdso_data, dcache_block_size));
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DEFINE(CFG_ICACHE_LOGBLOCKSZ, offsetof(struct vdso_data, icache_log_block_size));
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@ -288,8 +288,6 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
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max_cpus = NR_CPUS;
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else
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max_cpus = 1;
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smp_space_timers(max_cpus);
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for_each_possible_cpu(cpu)
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if (cpu != boot_cpuid)
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@ -149,16 +149,6 @@ unsigned long tb_ticks_per_usec = 100; /* sane default */
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EXPORT_SYMBOL(tb_ticks_per_usec);
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unsigned long tb_ticks_per_sec;
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EXPORT_SYMBOL(tb_ticks_per_sec); /* for cputime_t conversions */
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u64 tb_to_xs;
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unsigned tb_to_us;
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#define TICKLEN_SCALE NTP_SCALE_SHIFT
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static u64 last_tick_len; /* units are ns / 2^TICKLEN_SCALE */
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static u64 ticklen_to_xs; /* 0.64 fraction */
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/* If last_tick_len corresponds to about 1/HZ seconds, then
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last_tick_len << TICKLEN_SHIFT will be about 2^63. */
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#define TICKLEN_SHIFT (63 - 30 - TICKLEN_SCALE + SHIFT_HZ)
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DEFINE_SPINLOCK(rtc_lock);
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EXPORT_SYMBOL_GPL(rtc_lock);
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@ -174,7 +164,6 @@ unsigned long ppc_proc_freq;
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EXPORT_SYMBOL(ppc_proc_freq);
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unsigned long ppc_tb_freq;
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static u64 tb_last_jiffy __cacheline_aligned_in_smp;
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static DEFINE_PER_CPU(u64, last_jiffy);
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#ifdef CONFIG_VIRT_CPU_ACCOUNTING
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@ -446,7 +435,6 @@ EXPORT_SYMBOL(profile_pc);
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static int __init iSeries_tb_recal(void)
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{
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struct div_result divres;
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unsigned long titan, tb;
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/* Make sure we only run on iSeries */
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@ -477,10 +465,7 @@ static int __init iSeries_tb_recal(void)
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tb_ticks_per_jiffy = new_tb_ticks_per_jiffy;
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tb_ticks_per_sec = new_tb_ticks_per_sec;
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calc_cputime_factors();
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div128_by_32( XSEC_PER_SEC, 0, tb_ticks_per_sec, &divres );
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tb_to_xs = divres.result_low;
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vdso_data->tb_ticks_per_sec = tb_ticks_per_sec;
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vdso_data->tb_to_xs = tb_to_xs;
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setup_cputime_one_jiffy();
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}
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else {
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@ -643,27 +628,9 @@ void timer_interrupt(struct pt_regs * regs)
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trace_timer_interrupt_exit(regs);
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}
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void wakeup_decrementer(void)
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{
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unsigned long ticks;
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/*
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* The timebase gets saved on sleep and restored on wakeup,
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* so all we need to do is to reset the decrementer.
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*/
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ticks = tb_ticks_since(__get_cpu_var(last_jiffy));
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if (ticks < tb_ticks_per_jiffy)
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ticks = tb_ticks_per_jiffy - ticks;
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else
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ticks = 1;
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set_dec(ticks);
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}
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#ifdef CONFIG_SUSPEND
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void generic_suspend_disable_irqs(void)
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static void generic_suspend_disable_irqs(void)
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{
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preempt_disable();
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/* Disable the decrementer, so that it doesn't interfere
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* with suspending.
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*/
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@ -673,12 +640,9 @@ void generic_suspend_disable_irqs(void)
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set_dec(0x7fffffff);
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}
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void generic_suspend_enable_irqs(void)
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static void generic_suspend_enable_irqs(void)
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{
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wakeup_decrementer();
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local_irq_enable();
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preempt_enable();
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}
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/* Overrides the weak version in kernel/power/main.c */
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@ -698,23 +662,6 @@ void arch_suspend_enable_irqs(void)
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}
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#endif
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#ifdef CONFIG_SMP
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void __init smp_space_timers(unsigned int max_cpus)
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{
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int i;
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u64 previous_tb = per_cpu(last_jiffy, boot_cpuid);
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/* make sure tb > per_cpu(last_jiffy, cpu) for all cpus always */
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previous_tb -= tb_ticks_per_jiffy;
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for_each_possible_cpu(i) {
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if (i == boot_cpuid)
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continue;
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per_cpu(last_jiffy, i) = previous_tb;
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}
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}
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#endif
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/*
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* Scheduler clock - returns current time in nanosec units.
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*
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@ -853,6 +800,7 @@ void update_vsyscall(struct timespec *wall_time, struct timespec *wtm,
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struct clocksource *clock, u32 mult)
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{
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u64 new_tb_to_xs, new_stamp_xsec;
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u32 frac_sec;
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if (clock != &clocksource_timebase)
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return;
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@ -868,6 +816,10 @@ void update_vsyscall(struct timespec *wall_time, struct timespec *wtm,
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do_div(new_stamp_xsec, 1000000000);
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new_stamp_xsec += (u64) wall_time->tv_sec * XSEC_PER_SEC;
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BUG_ON(wall_time->tv_nsec >= NSEC_PER_SEC);
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/* this is tv_nsec / 1e9 as a 0.32 fraction */
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frac_sec = ((u64) wall_time->tv_nsec * 18446744073ULL) >> 32;
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/*
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* tb_update_count is used to allow the userspace gettimeofday code
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* to assure itself that it sees a consistent view of the tb_to_xs and
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@ -885,6 +837,7 @@ void update_vsyscall(struct timespec *wall_time, struct timespec *wtm,
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vdso_data->wtom_clock_sec = wtm->tv_sec;
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vdso_data->wtom_clock_nsec = wtm->tv_nsec;
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vdso_data->stamp_xtime = *wall_time;
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vdso_data->stamp_sec_fraction = frac_sec;
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smp_wmb();
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++(vdso_data->tb_update_count);
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}
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@ -1002,15 +955,13 @@ void secondary_cpu_time_init(void)
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/* This function is only called on the boot processor */
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void __init time_init(void)
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{
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unsigned long flags;
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struct div_result res;
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u64 scale, x;
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u64 scale;
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unsigned shift;
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if (__USE_RTC()) {
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/* 601 processor: dec counts down by 128 every 128ns */
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ppc_tb_freq = 1000000000;
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tb_last_jiffy = get_rtcl();
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} else {
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/* Normal PowerPC with timebase register */
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ppc_md.calibrate_decr();
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@ -1018,49 +969,14 @@ void __init time_init(void)
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ppc_tb_freq / 1000000, ppc_tb_freq % 1000000);
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printk(KERN_DEBUG "time_init: processor frequency = %lu.%.6lu MHz\n",
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ppc_proc_freq / 1000000, ppc_proc_freq % 1000000);
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tb_last_jiffy = get_tb();
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}
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tb_ticks_per_jiffy = ppc_tb_freq / HZ;
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tb_ticks_per_sec = ppc_tb_freq;
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tb_ticks_per_usec = ppc_tb_freq / 1000000;
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tb_to_us = mulhwu_scale_factor(ppc_tb_freq, 1000000);
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calc_cputime_factors();
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setup_cputime_one_jiffy();
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/*
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* Calculate the length of each tick in ns. It will not be
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* exactly 1e9/HZ unless ppc_tb_freq is divisible by HZ.
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* We compute 1e9 * tb_ticks_per_jiffy / ppc_tb_freq,
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* rounded up.
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*/
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x = (u64) NSEC_PER_SEC * tb_ticks_per_jiffy + ppc_tb_freq - 1;
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do_div(x, ppc_tb_freq);
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tick_nsec = x;
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last_tick_len = x << TICKLEN_SCALE;
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/*
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* Compute ticklen_to_xs, which is a factor which gets multiplied
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* by (last_tick_len << TICKLEN_SHIFT) to get a tb_to_xs value.
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* It is computed as:
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* ticklen_to_xs = 2^N / (tb_ticks_per_jiffy * 1e9)
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* where N = 64 + 20 - TICKLEN_SCALE - TICKLEN_SHIFT
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* which turns out to be N = 51 - SHIFT_HZ.
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* This gives the result as a 0.64 fixed-point fraction.
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* That value is reduced by an offset amounting to 1 xsec per
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* 2^31 timebase ticks to avoid problems with time going backwards
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* by 1 xsec when we do timer_recalc_offset due to losing the
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* fractional xsec. That offset is equal to ppc_tb_freq/2^51
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* since there are 2^20 xsec in a second.
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*/
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div128_by_32((1ULL << 51) - ppc_tb_freq, 0,
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tb_ticks_per_jiffy << SHIFT_HZ, &res);
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div128_by_32(res.result_high, res.result_low, NSEC_PER_SEC, &res);
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ticklen_to_xs = res.result_low;
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/* Compute tb_to_xs from tick_nsec */
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tb_to_xs = mulhdu(last_tick_len << TICKLEN_SHIFT, ticklen_to_xs);
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/*
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* Compute scale factor for sched_clock.
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* The calibrate_decr() function has set tb_ticks_per_sec,
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@ -1082,21 +998,14 @@ void __init time_init(void)
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/* Save the current timebase to pretty up CONFIG_PRINTK_TIME */
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boot_tb = get_tb_or_rtc();
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write_seqlock_irqsave(&xtime_lock, flags);
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/* If platform provided a timezone (pmac), we correct the time */
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if (timezone_offset) {
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sys_tz.tz_minuteswest = -timezone_offset / 60;
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sys_tz.tz_dsttime = 0;
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}
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vdso_data->tb_orig_stamp = tb_last_jiffy;
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vdso_data->tb_update_count = 0;
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vdso_data->tb_ticks_per_sec = tb_ticks_per_sec;
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vdso_data->stamp_xsec = (u64) get_seconds() * XSEC_PER_SEC;
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vdso_data->tb_to_xs = tb_to_xs;
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write_sequnlock_irqrestore(&xtime_lock, flags);
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/* Start the decrementer on CPUs that have manual control
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* such as BookE
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@ -1190,39 +1099,6 @@ void to_tm(int tim, struct rtc_time * tm)
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GregorianDay(tm);
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}
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/* Auxiliary function to compute scaling factors */
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/* Actually the choice of a timebase running at 1/4 the of the bus
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* frequency giving resolution of a few tens of nanoseconds is quite nice.
|
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* It makes this computation very precise (27-28 bits typically) which
|
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* is optimistic considering the stability of most processor clock
|
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* oscillators and the precision with which the timebase frequency
|
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* is measured but does not harm.
|
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*/
|
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unsigned mulhwu_scale_factor(unsigned inscale, unsigned outscale)
|
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{
|
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unsigned mlt=0, tmp, err;
|
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/* No concern for performance, it's done once: use a stupid
|
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* but safe and compact method to find the multiplier.
|
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*/
|
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|
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for (tmp = 1U<<31; tmp != 0; tmp >>= 1) {
|
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if (mulhwu(inscale, mlt|tmp) < outscale)
|
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mlt |= tmp;
|
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}
|
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|
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/* We might still be off by 1 for the best approximation.
|
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* A side effect of this is that if outscale is too large
|
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* the returned value will be zero.
|
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* Many corner cases have been checked and seem to work,
|
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* some might have been forgotten in the test however.
|
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*/
|
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|
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err = inscale * (mlt+1);
|
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if (err <= inscale/2)
|
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mlt++;
|
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return mlt;
|
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}
|
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|
||||
/*
|
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* Divide a 128-bit dividend by a 32-bit divisor, leaving a 128 bit
|
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* result.
|
||||
|
|
|
|||
|
|
@ -19,8 +19,10 @@
|
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/* Offset for the low 32-bit part of a field of long type */
|
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#ifdef CONFIG_PPC64
|
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#define LOPART 4
|
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#define TSPEC_TV_SEC TSPC64_TV_SEC+LOPART
|
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#else
|
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#define LOPART 0
|
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#define TSPEC_TV_SEC TSPC32_TV_SEC
|
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#endif
|
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|
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.text
|
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|
|
@ -41,23 +43,11 @@ V_FUNCTION_BEGIN(__kernel_gettimeofday)
|
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mr r9, r3 /* datapage ptr in r9 */
|
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cmplwi r10,0 /* check if tv is NULL */
|
||||
beq 3f
|
||||
bl __do_get_xsec@local /* get xsec from tb & kernel */
|
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bne- 2f /* out of line -> do syscall */
|
||||
|
||||
/* seconds are xsec >> 20 */
|
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rlwinm r5,r4,12,20,31
|
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rlwimi r5,r3,12,0,19
|
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stw r5,TVAL32_TV_SEC(r10)
|
||||
|
||||
/* get remaining xsec and convert to usec. we scale
|
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* up remaining xsec by 12 bits and get the top 32 bits
|
||||
* of the multiplication
|
||||
*/
|
||||
rlwinm r5,r4,12,0,19
|
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lis r6,1000000@h
|
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ori r6,r6,1000000@l
|
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mulhwu r5,r5,r6
|
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stw r5,TVAL32_TV_USEC(r10)
|
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lis r7,1000000@ha /* load up USEC_PER_SEC */
|
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addi r7,r7,1000000@l /* so we get microseconds in r4 */
|
||||
bl __do_get_tspec@local /* get sec/usec from tb & kernel */
|
||||
stw r3,TVAL32_TV_SEC(r10)
|
||||
stw r4,TVAL32_TV_USEC(r10)
|
||||
|
||||
3: cmplwi r11,0 /* check if tz is NULL */
|
||||
beq 1f
|
||||
|
|
@ -70,14 +60,6 @@ V_FUNCTION_BEGIN(__kernel_gettimeofday)
|
|||
crclr cr0*4+so
|
||||
li r3,0
|
||||
blr
|
||||
|
||||
2:
|
||||
mtlr r12
|
||||
mr r3,r10
|
||||
mr r4,r11
|
||||
li r0,__NR_gettimeofday
|
||||
sc
|
||||
blr
|
||||
.cfi_endproc
|
||||
V_FUNCTION_END(__kernel_gettimeofday)
|
||||
|
||||
|
|
@ -100,7 +82,8 @@ V_FUNCTION_BEGIN(__kernel_clock_gettime)
|
|||
mr r11,r4 /* r11 saves tp */
|
||||
bl __get_datapage@local /* get data page */
|
||||
mr r9,r3 /* datapage ptr in r9 */
|
||||
|
||||
lis r7,NSEC_PER_SEC@h /* want nanoseconds */
|
||||
ori r7,r7,NSEC_PER_SEC@l
|
||||
50: bl __do_get_tspec@local /* get sec/nsec from tb & kernel */
|
||||
bne cr1,80f /* not monotonic -> all done */
|
||||
|
||||
|
|
@ -198,83 +181,12 @@ V_FUNCTION_END(__kernel_clock_getres)
|
|||
|
||||
|
||||
/*
|
||||
* This is the core of gettimeofday() & friends, it returns the xsec
|
||||
* value in r3 & r4 and expects the datapage ptr (non clobbered)
|
||||
* in r9. clobbers r0,r4,r5,r6,r7,r8.
|
||||
* When returning, r8 contains the counter value that can be reused
|
||||
* by the monotonic clock implementation
|
||||
*/
|
||||
__do_get_xsec:
|
||||
.cfi_startproc
|
||||
/* Check for update count & load values. We use the low
|
||||
* order 32 bits of the update count
|
||||
*/
|
||||
1: lwz r8,(CFG_TB_UPDATE_COUNT+LOPART)(r9)
|
||||
andi. r0,r8,1 /* pending update ? loop */
|
||||
bne- 1b
|
||||
xor r0,r8,r8 /* create dependency */
|
||||
add r9,r9,r0
|
||||
|
||||
/* Load orig stamp (offset to TB) */
|
||||
lwz r5,CFG_TB_ORIG_STAMP(r9)
|
||||
lwz r6,(CFG_TB_ORIG_STAMP+4)(r9)
|
||||
|
||||
/* Get a stable TB value */
|
||||
2: mftbu r3
|
||||
mftbl r4
|
||||
mftbu r0
|
||||
cmpl cr0,r3,r0
|
||||
bne- 2b
|
||||
|
||||
/* Substract tb orig stamp. If the high part is non-zero, we jump to
|
||||
* the slow path which call the syscall.
|
||||
* If it's ok, then we have our 32 bits tb_ticks value in r7
|
||||
*/
|
||||
subfc r7,r6,r4
|
||||
subfe. r0,r5,r3
|
||||
bne- 3f
|
||||
|
||||
/* Load scale factor & do multiplication */
|
||||
lwz r5,CFG_TB_TO_XS(r9) /* load values */
|
||||
lwz r6,(CFG_TB_TO_XS+4)(r9)
|
||||
mulhwu r4,r7,r5
|
||||
mulhwu r6,r7,r6
|
||||
mullw r0,r7,r5
|
||||
addc r6,r6,r0
|
||||
|
||||
/* At this point, we have the scaled xsec value in r4 + XER:CA
|
||||
* we load & add the stamp since epoch
|
||||
*/
|
||||
lwz r5,CFG_STAMP_XSEC(r9)
|
||||
lwz r6,(CFG_STAMP_XSEC+4)(r9)
|
||||
adde r4,r4,r6
|
||||
addze r3,r5
|
||||
|
||||
/* We now have our result in r3,r4. We create a fake dependency
|
||||
* on that result and re-check the counter
|
||||
*/
|
||||
or r6,r4,r3
|
||||
xor r0,r6,r6
|
||||
add r9,r9,r0
|
||||
lwz r0,(CFG_TB_UPDATE_COUNT+LOPART)(r9)
|
||||
cmpl cr0,r8,r0 /* check if updated */
|
||||
bne- 1b
|
||||
|
||||
/* Warning ! The caller expects CR:EQ to be set to indicate a
|
||||
* successful calculation (so it won't fallback to the syscall
|
||||
* method). We have overriden that CR bit in the counter check,
|
||||
* but fortunately, the loop exit condition _is_ CR:EQ set, so
|
||||
* we can exit safely here. If you change this code, be careful
|
||||
* of that side effect.
|
||||
*/
|
||||
3: blr
|
||||
.cfi_endproc
|
||||
|
||||
/*
|
||||
* This is the core of clock_gettime(), it returns the current
|
||||
* time in seconds and nanoseconds in r3 and r4.
|
||||
* This is the core of clock_gettime() and gettimeofday(),
|
||||
* it returns the current time in r3 (seconds) and r4.
|
||||
* On entry, r7 gives the resolution of r4, either USEC_PER_SEC
|
||||
* or NSEC_PER_SEC, giving r4 in microseconds or nanoseconds.
|
||||
* It expects the datapage ptr in r9 and doesn't clobber it.
|
||||
* It clobbers r0, r5, r6, r10 and returns NSEC_PER_SEC in r7.
|
||||
* It clobbers r0, r5 and r6.
|
||||
* On return, r8 contains the counter value that can be reused.
|
||||
* This clobbers cr0 but not any other cr field.
|
||||
*/
|
||||
|
|
@ -297,70 +209,58 @@ __do_get_tspec:
|
|||
2: mftbu r3
|
||||
mftbl r4
|
||||
mftbu r0
|
||||
cmpl cr0,r3,r0
|
||||
cmplw cr0,r3,r0
|
||||
bne- 2b
|
||||
|
||||
/* Subtract tb orig stamp and shift left 12 bits.
|
||||
*/
|
||||
subfc r7,r6,r4
|
||||
subfc r4,r6,r4
|
||||
subfe r0,r5,r3
|
||||
slwi r0,r0,12
|
||||
rlwimi. r0,r7,12,20,31
|
||||
slwi r7,r7,12
|
||||
rlwimi. r0,r4,12,20,31
|
||||
slwi r4,r4,12
|
||||
|
||||
/* Load scale factor & do multiplication */
|
||||
/*
|
||||
* Load scale factor & do multiplication.
|
||||
* We only use the high 32 bits of the tb_to_xs value.
|
||||
* Even with a 1GHz timebase clock, the high 32 bits of
|
||||
* tb_to_xs will be at least 4 million, so the error from
|
||||
* ignoring the low 32 bits will be no more than 0.25ppm.
|
||||
* The error will just make the clock run very very slightly
|
||||
* slow until the next time the kernel updates the VDSO data,
|
||||
* at which point the clock will catch up to the kernel's value,
|
||||
* so there is no long-term error accumulation.
|
||||
*/
|
||||
lwz r5,CFG_TB_TO_XS(r9) /* load values */
|
||||
lwz r6,(CFG_TB_TO_XS+4)(r9)
|
||||
mulhwu r3,r7,r6
|
||||
mullw r10,r7,r5
|
||||
mulhwu r4,r7,r5
|
||||
addc r10,r3,r10
|
||||
mulhwu r4,r4,r5
|
||||
li r3,0
|
||||
|
||||
beq+ 4f /* skip high part computation if 0 */
|
||||
mulhwu r3,r0,r5
|
||||
mullw r7,r0,r5
|
||||
mulhwu r5,r0,r6
|
||||
mullw r6,r0,r6
|
||||
adde r4,r4,r7
|
||||
addze r3,r3
|
||||
mullw r5,r0,r5
|
||||
addc r4,r4,r5
|
||||
addze r3,r3
|
||||
addc r10,r10,r6
|
||||
|
||||
4: addze r4,r4 /* add in carry */
|
||||
lis r7,NSEC_PER_SEC@h
|
||||
ori r7,r7,NSEC_PER_SEC@l
|
||||
mulhwu r4,r4,r7 /* convert to nanoseconds */
|
||||
|
||||
/* At this point, we have seconds & nanoseconds since the xtime
|
||||
* stamp in r3+CA and r4. Load & add the xtime stamp.
|
||||
4:
|
||||
/* At this point, we have seconds since the xtime stamp
|
||||
* as a 32.32 fixed-point number in r3 and r4.
|
||||
* Load & add the xtime stamp.
|
||||
*/
|
||||
#ifdef CONFIG_PPC64
|
||||
lwz r5,STAMP_XTIME+TSPC64_TV_SEC+LOPART(r9)
|
||||
lwz r6,STAMP_XTIME+TSPC64_TV_NSEC+LOPART(r9)
|
||||
#else
|
||||
lwz r5,STAMP_XTIME+TSPC32_TV_SEC(r9)
|
||||
lwz r6,STAMP_XTIME+TSPC32_TV_NSEC(r9)
|
||||
#endif
|
||||
add r4,r4,r6
|
||||
lwz r5,STAMP_XTIME+TSPEC_TV_SEC(r9)
|
||||
lwz r6,STAMP_SEC_FRAC(r9)
|
||||
addc r4,r4,r6
|
||||
adde r3,r3,r5
|
||||
|
||||
/* We now have our result in r3,r4. We create a fake dependency
|
||||
* on that result and re-check the counter
|
||||
/* We create a fake dependency on the result in r3/r4
|
||||
* and re-check the counter
|
||||
*/
|
||||
or r6,r4,r3
|
||||
xor r0,r6,r6
|
||||
add r9,r9,r0
|
||||
lwz r0,(CFG_TB_UPDATE_COUNT+LOPART)(r9)
|
||||
cmpl cr0,r8,r0 /* check if updated */
|
||||
cmplw cr0,r8,r0 /* check if updated */
|
||||
bne- 1b
|
||||
|
||||
/* check for nanosecond overflow and adjust if necessary */
|
||||
cmpw r4,r7
|
||||
bltlr /* all done if no overflow */
|
||||
subf r4,r7,r4 /* adjust if overflow */
|
||||
addi r3,r3,1
|
||||
mulhwu r4,r4,r7 /* convert to micro or nanoseconds */
|
||||
|
||||
blr
|
||||
.cfi_endproc
|
||||
|
|
|
|||
|
|
@ -33,18 +33,11 @@ V_FUNCTION_BEGIN(__kernel_gettimeofday)
|
|||
bl V_LOCAL_FUNC(__get_datapage) /* get data page */
|
||||
cmpldi r11,0 /* check if tv is NULL */
|
||||
beq 2f
|
||||
bl V_LOCAL_FUNC(__do_get_xsec) /* get xsec from tb & kernel */
|
||||
lis r7,15 /* r7 = 1000000 = USEC_PER_SEC */
|
||||
ori r7,r7,16960
|
||||
rldicl r5,r4,44,20 /* r5 = sec = xsec / XSEC_PER_SEC */
|
||||
rldicr r6,r5,20,43 /* r6 = sec * XSEC_PER_SEC */
|
||||
std r5,TVAL64_TV_SEC(r11) /* store sec in tv */
|
||||
subf r0,r6,r4 /* r0 = xsec = (xsec - r6) */
|
||||
mulld r0,r0,r7 /* usec = (xsec * USEC_PER_SEC) /
|
||||
* XSEC_PER_SEC
|
||||
*/
|
||||
rldicl r0,r0,44,20
|
||||
std r0,TVAL64_TV_USEC(r11) /* store usec in tv */
|
||||
lis r7,1000000@ha /* load up USEC_PER_SEC */
|
||||
addi r7,r7,1000000@l
|
||||
bl V_LOCAL_FUNC(__do_get_tspec) /* get sec/us from tb & kernel */
|
||||
std r4,TVAL64_TV_SEC(r11) /* store sec in tv */
|
||||
std r5,TVAL64_TV_USEC(r11) /* store usec in tv */
|
||||
2: cmpldi r10,0 /* check if tz is NULL */
|
||||
beq 1f
|
||||
lwz r4,CFG_TZ_MINUTEWEST(r3)/* fill tz */
|
||||
|
|
@ -77,6 +70,8 @@ V_FUNCTION_BEGIN(__kernel_clock_gettime)
|
|||
.cfi_register lr,r12
|
||||
mr r11,r4 /* r11 saves tp */
|
||||
bl V_LOCAL_FUNC(__get_datapage) /* get data page */
|
||||
lis r7,NSEC_PER_SEC@h /* want nanoseconds */
|
||||
ori r7,r7,NSEC_PER_SEC@l
|
||||
50: bl V_LOCAL_FUNC(__do_get_tspec) /* get time from tb & kernel */
|
||||
bne cr1,80f /* if not monotonic, all done */
|
||||
|
||||
|
|
@ -171,49 +166,12 @@ V_FUNCTION_END(__kernel_clock_getres)
|
|||
|
||||
|
||||
/*
|
||||
* This is the core of gettimeofday(), it returns the xsec
|
||||
* value in r4 and expects the datapage ptr (non clobbered)
|
||||
* in r3. clobbers r0,r4,r5,r6,r7,r8
|
||||
* When returning, r8 contains the counter value that can be reused
|
||||
*/
|
||||
V_FUNCTION_BEGIN(__do_get_xsec)
|
||||
.cfi_startproc
|
||||
/* check for update count & load values */
|
||||
1: ld r8,CFG_TB_UPDATE_COUNT(r3)
|
||||
andi. r0,r8,1 /* pending update ? loop */
|
||||
bne- 1b
|
||||
xor r0,r8,r8 /* create dependency */
|
||||
add r3,r3,r0
|
||||
|
||||
/* Get TB & offset it. We use the MFTB macro which will generate
|
||||
* workaround code for Cell.
|
||||
*/
|
||||
MFTB(r7)
|
||||
ld r9,CFG_TB_ORIG_STAMP(r3)
|
||||
subf r7,r9,r7
|
||||
|
||||
/* Scale result */
|
||||
ld r5,CFG_TB_TO_XS(r3)
|
||||
mulhdu r7,r7,r5
|
||||
|
||||
/* Add stamp since epoch */
|
||||
ld r6,CFG_STAMP_XSEC(r3)
|
||||
add r4,r6,r7
|
||||
|
||||
xor r0,r4,r4
|
||||
add r3,r3,r0
|
||||
ld r0,CFG_TB_UPDATE_COUNT(r3)
|
||||
cmpld cr0,r0,r8 /* check if updated */
|
||||
bne- 1b
|
||||
blr
|
||||
.cfi_endproc
|
||||
V_FUNCTION_END(__do_get_xsec)
|
||||
|
||||
/*
|
||||
* This is the core of clock_gettime(), it returns the current
|
||||
* time in seconds and nanoseconds in r4 and r5.
|
||||
* This is the core of clock_gettime() and gettimeofday(),
|
||||
* it returns the current time in r4 (seconds) and r5.
|
||||
* On entry, r7 gives the resolution of r5, either USEC_PER_SEC
|
||||
* or NSEC_PER_SEC, giving r5 in microseconds or nanoseconds.
|
||||
* It expects the datapage ptr in r3 and doesn't clobber it.
|
||||
* It clobbers r0 and r6 and returns NSEC_PER_SEC in r7.
|
||||
* It clobbers r0, r6 and r9.
|
||||
* On return, r8 contains the counter value that can be reused.
|
||||
* This clobbers cr0 but not any other cr field.
|
||||
*/
|
||||
|
|
@ -229,18 +187,18 @@ V_FUNCTION_BEGIN(__do_get_tspec)
|
|||
/* Get TB & offset it. We use the MFTB macro which will generate
|
||||
* workaround code for Cell.
|
||||
*/
|
||||
MFTB(r7)
|
||||
MFTB(r6)
|
||||
ld r9,CFG_TB_ORIG_STAMP(r3)
|
||||
subf r7,r9,r7
|
||||
subf r6,r9,r6
|
||||
|
||||
/* Scale result */
|
||||
ld r5,CFG_TB_TO_XS(r3)
|
||||
sldi r7,r7,12 /* compute time since stamp_xtime */
|
||||
mulhdu r6,r7,r5 /* in units of 2^-32 seconds */
|
||||
sldi r6,r6,12 /* compute time since stamp_xtime */
|
||||
mulhdu r6,r6,r5 /* in units of 2^-32 seconds */
|
||||
|
||||
/* Add stamp since epoch */
|
||||
ld r4,STAMP_XTIME+TSPC64_TV_SEC(r3)
|
||||
ld r5,STAMP_XTIME+TSPC64_TV_NSEC(r3)
|
||||
lwz r5,STAMP_SEC_FRAC(r3)
|
||||
or r0,r4,r5
|
||||
or r0,r0,r6
|
||||
xor r0,r0,r0
|
||||
|
|
@ -250,17 +208,11 @@ V_FUNCTION_BEGIN(__do_get_tspec)
|
|||
bne- 1b /* reload if so */
|
||||
|
||||
/* convert to seconds & nanoseconds and add to stamp */
|
||||
lis r7,NSEC_PER_SEC@h
|
||||
ori r7,r7,NSEC_PER_SEC@l
|
||||
mulhwu r0,r6,r7 /* compute nanoseconds and */
|
||||
add r6,r6,r5 /* add on fractional seconds of xtime */
|
||||
mulhwu r5,r6,r7 /* compute micro or nanoseconds and */
|
||||
srdi r6,r6,32 /* seconds since stamp_xtime */
|
||||
clrldi r0,r0,32
|
||||
add r5,r5,r0 /* add nanoseconds together */
|
||||
cmpd r5,r7 /* overflow? */
|
||||
clrldi r5,r5,32
|
||||
add r4,r4,r6
|
||||
bltlr /* all done if no overflow */
|
||||
subf r5,r7,r5 /* if overflow, adjust */
|
||||
addi r4,r4,1
|
||||
blr
|
||||
.cfi_endproc
|
||||
V_FUNCTION_END(__do_get_tspec)
|
||||
|
|
|
|||
|
|
@ -216,9 +216,6 @@ static int lite5200_pm_enter(suspend_state_t state)
|
|||
|
||||
lite5200_restore_regs();
|
||||
|
||||
/* restart jiffies */
|
||||
wakeup_decrementer();
|
||||
|
||||
iounmap(mbar);
|
||||
return 0;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -171,9 +171,6 @@ int mpc52xx_pm_enter(suspend_state_t state)
|
|||
/* restore SRAM */
|
||||
memcpy(sram, saved_sram, sram_size);
|
||||
|
||||
/* restart jiffies */
|
||||
wakeup_decrementer();
|
||||
|
||||
/* reenable interrupts in PIC */
|
||||
out_be32(&intr->main_mask, intr_main_mask);
|
||||
|
||||
|
|
|
|||
|
|
@ -310,8 +310,12 @@ static int pmu_set_cpu_speed(int low_speed)
|
|||
/* Restore low level PMU operations */
|
||||
pmu_unlock();
|
||||
|
||||
/* Restore decrementer */
|
||||
wakeup_decrementer();
|
||||
/*
|
||||
* Restore decrementer; we'll take a decrementer interrupt
|
||||
* as soon as interrupts are re-enabled and the generic
|
||||
* clockevents code will reprogram it with the right value.
|
||||
*/
|
||||
set_dec(1);
|
||||
|
||||
/* Restore interrupts */
|
||||
mpic_cpu_set_priority(pic_prio);
|
||||
|
|
|
|||
Reference in New Issue