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Conflicts: arch/arm/mach-vexpress/v2m.c arch/arm/plat-omap/counter_32k.c arch/arm/plat-versatile/Makefile
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,118 @@ | ||
| /* | ||
| * sched_clock.h: support for extending counters to full 64-bit ns counter | ||
| * | ||
| * This program is free software; you can redistribute it and/or modify | ||
| * it under the terms of the GNU General Public License version 2 as | ||
| * published by the Free Software Foundation. | ||
| */ | ||
| #ifndef ASM_SCHED_CLOCK | ||
| #define ASM_SCHED_CLOCK | ||
|
|
||
| #include <linux/kernel.h> | ||
| #include <linux/types.h> | ||
|
|
||
| struct clock_data { | ||
| u64 epoch_ns; | ||
| u32 epoch_cyc; | ||
| u32 epoch_cyc_copy; | ||
| u32 mult; | ||
| u32 shift; | ||
| }; | ||
|
|
||
| #define DEFINE_CLOCK_DATA(name) struct clock_data name | ||
|
|
||
| static inline u64 cyc_to_ns(u64 cyc, u32 mult, u32 shift) | ||
| { | ||
| return (cyc * mult) >> shift; | ||
| } | ||
|
|
||
| /* | ||
| * Atomically update the sched_clock epoch. Your update callback will | ||
| * be called from a timer before the counter wraps - read the current | ||
| * counter value, and call this function to safely move the epochs | ||
| * forward. Only use this from the update callback. | ||
| */ | ||
| static inline void update_sched_clock(struct clock_data *cd, u32 cyc, u32 mask) | ||
| { | ||
| unsigned long flags; | ||
| u64 ns = cd->epoch_ns + | ||
| cyc_to_ns((cyc - cd->epoch_cyc) & mask, cd->mult, cd->shift); | ||
|
|
||
| /* | ||
| * Write epoch_cyc and epoch_ns in a way that the update is | ||
| * detectable in cyc_to_fixed_sched_clock(). | ||
| */ | ||
| raw_local_irq_save(flags); | ||
| cd->epoch_cyc = cyc; | ||
| smp_wmb(); | ||
| cd->epoch_ns = ns; | ||
| smp_wmb(); | ||
| cd->epoch_cyc_copy = cyc; | ||
| raw_local_irq_restore(flags); | ||
| } | ||
|
|
||
| /* | ||
| * If your clock rate is known at compile time, using this will allow | ||
| * you to optimize the mult/shift loads away. This is paired with | ||
| * init_fixed_sched_clock() to ensure that your mult/shift are correct. | ||
| */ | ||
| static inline unsigned long long cyc_to_fixed_sched_clock(struct clock_data *cd, | ||
| u32 cyc, u32 mask, u32 mult, u32 shift) | ||
| { | ||
| u64 epoch_ns; | ||
| u32 epoch_cyc; | ||
|
|
||
| /* | ||
| * Load the epoch_cyc and epoch_ns atomically. We do this by | ||
| * ensuring that we always write epoch_cyc, epoch_ns and | ||
| * epoch_cyc_copy in strict order, and read them in strict order. | ||
| * If epoch_cyc and epoch_cyc_copy are not equal, then we're in | ||
| * the middle of an update, and we should repeat the load. | ||
| */ | ||
| do { | ||
| epoch_cyc = cd->epoch_cyc; | ||
| smp_rmb(); | ||
| epoch_ns = cd->epoch_ns; | ||
| smp_rmb(); | ||
| } while (epoch_cyc != cd->epoch_cyc_copy); | ||
|
|
||
| return epoch_ns + cyc_to_ns((cyc - epoch_cyc) & mask, mult, shift); | ||
| } | ||
|
|
||
| /* | ||
| * Otherwise, you need to use this, which will obtain the mult/shift | ||
| * from the clock_data structure. Use init_sched_clock() with this. | ||
| */ | ||
| static inline unsigned long long cyc_to_sched_clock(struct clock_data *cd, | ||
| u32 cyc, u32 mask) | ||
| { | ||
| return cyc_to_fixed_sched_clock(cd, cyc, mask, cd->mult, cd->shift); | ||
| } | ||
|
|
||
| /* | ||
| * Initialize the clock data - calculate the appropriate multiplier | ||
| * and shift. Also setup a timer to ensure that the epoch is refreshed | ||
| * at the appropriate time interval, which will call your update | ||
| * handler. | ||
| */ | ||
| void init_sched_clock(struct clock_data *, void (*)(void), | ||
| unsigned int, unsigned long); | ||
|
|
||
| /* | ||
| * Use this initialization function rather than init_sched_clock() if | ||
| * you're using cyc_to_fixed_sched_clock, which will warn if your | ||
| * constants are incorrect. | ||
| */ | ||
| static inline void init_fixed_sched_clock(struct clock_data *cd, | ||
| void (*update)(void), unsigned int bits, unsigned long rate, | ||
| u32 mult, u32 shift) | ||
| { | ||
| init_sched_clock(cd, update, bits, rate); | ||
| if (cd->mult != mult || cd->shift != shift) { | ||
| pr_crit("sched_clock: wrong multiply/shift: %u>>%u vs calculated %u>>%u\n" | ||
| "sched_clock: fix multiply/shift to avoid scheduler hiccups\n", | ||
| mult, shift, cd->mult, cd->shift); | ||
| } | ||
| } | ||
|
|
||
| #endif |
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