From 7b1f62076bba10786d2118006ae68ac120cd6c56 Mon Sep 17 00:00:00 2001 From: Stephen Warren Date: Wed, 7 Nov 2012 17:58:54 -0700 Subject: [PATCH] time: convert arch_gettimeoffset to a pointer Currently, whenever CONFIG_ARCH_USES_GETTIMEOFFSET is enabled, each arch core provides a single implementation of arch_gettimeoffset(). In many cases, different sub-architectures, different machines, or different timer providers exist, and so the arch ends up implementing arch_gettimeoffset() as a call-through-pointer anyway. Examples are ARM, Cris, M68K, and it's arguable that the remaining architectures, M32R and Blackfin, should be doing this anyway. Modify arch_gettimeoffset so that it itself is a function pointer, which the arch initializes. This will allow later changes to move the initialization of this function into individual machine support or timer drivers. This is particularly useful for code in drivers/clocksource which should rely on an arch-independant mechanism to register their implementation of arch_gettimeoffset(). This patch also converts the Cris architecture to set arch_gettimeoffset directly to the final implementation in time_init(), because Cris already had separate time_init() functions per sub-architecture. M68K and ARM are converted to set arch_gettimeoffset to the final implementation in later patches, because they already have function pointers in place for this purpose. Cc: Russell King Cc: Mike Frysinger Cc: Mikael Starvik Cc: Hirokazu Takata Cc: Thomas Gleixner Acked-by: Geert Uytterhoeven Acked-by: Jesper Nilsson Acked-by: John Stultz Signed-off-by: Stephen Warren --- arch/arm/kernel/time.c | 6 +++++- arch/blackfin/kernel/time.c | 6 +++++- arch/cris/arch-v10/kernel/time.c | 6 ++++-- arch/cris/kernel/time.c | 11 ----------- arch/m32r/kernel/time.c | 4 +++- arch/m68k/kernel/time.c | 16 ++++++++++------ include/linux/time.h | 4 +--- kernel/time/timekeeping.c | 26 ++++++++++++++++++++------ 8 files changed, 48 insertions(+), 31 deletions(-) diff --git a/arch/arm/kernel/time.c b/arch/arm/kernel/time.c index 09be0c3c9069..b0190b41cb33 100644 --- a/arch/arm/kernel/time.c +++ b/arch/arm/kernel/time.c @@ -70,7 +70,7 @@ EXPORT_SYMBOL(profile_pc); #endif #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET -u32 arch_gettimeoffset(void) +static u32 arm_gettimeoffset(void) { if (system_timer->offset != NULL) return system_timer->offset() * 1000; @@ -164,6 +164,10 @@ device_initcall(timer_init_syscore_ops); void __init time_init(void) { +#ifdef CONFIG_ARCH_USES_GETTIMEOFFSET + arch_gettimeoffset = arm_gettimeoffset; +#endif + system_timer = machine_desc->timer; system_timer->init(); sched_clock_postinit(); diff --git a/arch/blackfin/kernel/time.c b/arch/blackfin/kernel/time.c index 2310b249675f..3126b920a4a5 100644 --- a/arch/blackfin/kernel/time.c +++ b/arch/blackfin/kernel/time.c @@ -85,7 +85,7 @@ time_sched_init(irqreturn_t(*timer_routine) (int, void *)) /* * Should return useconds since last timer tick */ -u32 arch_gettimeoffset(void) +static u32 blackfin_gettimeoffset(void) { unsigned long offset; unsigned long clocks_per_jiffy; @@ -141,6 +141,10 @@ void read_persistent_clock(struct timespec *ts) void __init time_init(void) { +#ifdef CONFIG_ARCH_USES_GETTIMEOFFSET + arch_gettimeoffset = blackfin_gettimeoffset; +#endif + #ifdef CONFIG_RTC_DRV_BFIN /* [#2663] hack to filter junk RTC values that would cause * userspace to have to deal with time values greater than diff --git a/arch/cris/arch-v10/kernel/time.c b/arch/cris/arch-v10/kernel/time.c index 162892f24a20..fce7c541d70d 100644 --- a/arch/cris/arch-v10/kernel/time.c +++ b/arch/cris/arch-v10/kernel/time.c @@ -55,9 +55,9 @@ unsigned long get_ns_in_jiffie(void) return ns; } -unsigned long do_slow_gettimeoffset(void) +static u32 cris_v10_gettimeoffset(void) { - unsigned long count; + u32 count; /* The timer interrupt comes from Etrax timer 0. In order to get * better precision, we check the current value. It might have @@ -191,6 +191,8 @@ static struct irqaction irq2 = { void __init time_init(void) { + arch_gettimeoffset = cris_v10_gettimeoffset; + /* probe for the RTC and read it if it exists * Before the RTC can be probed the loops_per_usec variable needs * to be initialized to make usleep work. A better value for diff --git a/arch/cris/kernel/time.c b/arch/cris/kernel/time.c index b063c9217b5c..fe6acdabbc8d 100644 --- a/arch/cris/kernel/time.c +++ b/arch/cris/kernel/time.c @@ -39,17 +39,6 @@ extern unsigned long loops_per_jiffy; /* init/main.c */ unsigned long loops_per_usec; - -#ifdef CONFIG_ARCH_USES_GETTIMEOFFSET -extern unsigned long do_slow_gettimeoffset(void); -static unsigned long (*do_gettimeoffset)(void) = do_slow_gettimeoffset; - -u32 arch_gettimeoffset(void) -{ - return do_gettimeoffset(); -} -#endif - int set_rtc_mmss(unsigned long nowtime) { D(printk(KERN_DEBUG "set_rtc_mmss(%lu)\n", nowtime)); diff --git a/arch/m32r/kernel/time.c b/arch/m32r/kernel/time.c index 84dd04048db9..1a15f81ea1bd 100644 --- a/arch/m32r/kernel/time.c +++ b/arch/m32r/kernel/time.c @@ -57,7 +57,7 @@ extern void smp_local_timer_interrupt(void); static unsigned long latch; -u32 arch_gettimeoffset(void) +static u32 m32r_gettimeoffset(void) { unsigned long elapsed_time = 0; /* [us] */ @@ -165,6 +165,8 @@ void read_persistent_clock(struct timespec *ts) void __init time_init(void) { + arch_gettimeoffset = m32r_gettimeoffset; + #if defined(CONFIG_CHIP_M32102) || defined(CONFIG_CHIP_XNUX2) \ || defined(CONFIG_CHIP_VDEC2) || defined(CONFIG_CHIP_M32700) \ || defined(CONFIG_CHIP_OPSP) || defined(CONFIG_CHIP_M32104) diff --git a/arch/m68k/kernel/time.c b/arch/m68k/kernel/time.c index 5d0bcaad2e55..c2994c8c30d5 100644 --- a/arch/m68k/kernel/time.c +++ b/arch/m68k/kernel/time.c @@ -80,14 +80,9 @@ void read_persistent_clock(struct timespec *ts) } } -void __init time_init(void) -{ - mach_sched_init(timer_interrupt); -} - #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET -u32 arch_gettimeoffset(void) +static u32 m68k_gettimeoffset(void) { return mach_gettimeoffset() * 1000; } @@ -106,3 +101,12 @@ static int __init rtc_init(void) module_init(rtc_init); #endif /* CONFIG_ARCH_USES_GETTIMEOFFSET */ + +void __init time_init(void) +{ +#ifdef CONFIG_ARCH_USES_GETTIMEOFFSET + arch_gettimeoffset = m68k_gettimeoffset; +#endif + + mach_sched_init(timer_interrupt); +} diff --git a/include/linux/time.h b/include/linux/time.h index 4d358e9d10f1..05e32a72103c 100644 --- a/include/linux/time.h +++ b/include/linux/time.h @@ -142,9 +142,7 @@ void timekeeping_inject_sleeptime(struct timespec *delta); * finer then tick granular time. */ #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET -extern u32 arch_gettimeoffset(void); -#else -static inline u32 arch_gettimeoffset(void) { return 0; } +extern u32 (*arch_gettimeoffset)(void); #endif extern void do_gettimeofday(struct timeval *tv); diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c index cbc6acb0db3f..8ed934601587 100644 --- a/kernel/time/timekeeping.c +++ b/kernel/time/timekeeping.c @@ -135,6 +135,20 @@ static void tk_setup_internals(struct timekeeper *tk, struct clocksource *clock) } /* Timekeeper helper functions. */ + +#ifdef CONFIG_ARCH_USES_GETTIMEOFFSET +u32 (*arch_gettimeoffset)(void); + +u32 get_arch_timeoffset(void) +{ + if (likely(arch_gettimeoffset)) + return arch_gettimeoffset(); + return 0; +} +#else +static inline u32 get_arch_timeoffset(void) { return 0; } +#endif + static inline s64 timekeeping_get_ns(struct timekeeper *tk) { cycle_t cycle_now, cycle_delta; @@ -151,8 +165,8 @@ static inline s64 timekeeping_get_ns(struct timekeeper *tk) nsec = cycle_delta * tk->mult + tk->xtime_nsec; nsec >>= tk->shift; - /* If arch requires, add in gettimeoffset() */ - return nsec + arch_gettimeoffset(); + /* If arch requires, add in get_arch_timeoffset() */ + return nsec + get_arch_timeoffset(); } static inline s64 timekeeping_get_ns_raw(struct timekeeper *tk) @@ -171,8 +185,8 @@ static inline s64 timekeeping_get_ns_raw(struct timekeeper *tk) /* convert delta to nanoseconds. */ nsec = clocksource_cyc2ns(cycle_delta, clock->mult, clock->shift); - /* If arch requires, add in gettimeoffset() */ - return nsec + arch_gettimeoffset(); + /* If arch requires, add in get_arch_timeoffset() */ + return nsec + get_arch_timeoffset(); } static RAW_NOTIFIER_HEAD(pvclock_gtod_chain); @@ -254,8 +268,8 @@ static void timekeeping_forward_now(struct timekeeper *tk) tk->xtime_nsec += cycle_delta * tk->mult; - /* If arch requires, add in gettimeoffset() */ - tk->xtime_nsec += (u64)arch_gettimeoffset() << tk->shift; + /* If arch requires, add in get_arch_timeoffset() */ + tk->xtime_nsec += (u64)get_arch_timeoffset() << tk->shift; tk_normalize_xtime(tk); -- 2.39.5