diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2007-02-16 01:27:43 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-02-16 08:13:57 -0800 |
| commit | 5d8b34fdcb384161552d01ee8f34af5ff11f9684 (patch) | |
| tree | 7052d50574d747b7ec2172051adf8126074d6982 /include/linux/clocksource.h | |
| parent | 7e69f2b1ead2a4c51c12817f18263ff0e59335a6 (diff) | |
| download | lwn-5d8b34fdcb384161552d01ee8f34af5ff11f9684.tar.gz lwn-5d8b34fdcb384161552d01ee8f34af5ff11f9684.zip | |
[PATCH] clocksource: Add verification (watchdog) helper
The TSC needs to be verified against another clocksource. Instead of using
hardwired assumptions of available hardware, provide a generic verification
mechanism. The verification uses the best available clocksource and handles
the usability for high resolution timers / dynticks of the clocksource which
needs to be verified.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Cc: john stultz <johnstul@us.ibm.com>
Cc: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/clocksource.h')
| -rw-r--r-- | include/linux/clocksource.h | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/include/linux/clocksource.h b/include/linux/clocksource.h index a585a29fe7c4..830a250ecf94 100644 --- a/include/linux/clocksource.h +++ b/include/linux/clocksource.h @@ -12,11 +12,13 @@ #include <linux/timex.h> #include <linux/time.h> #include <linux/list.h> +#include <linux/timer.h> #include <asm/div64.h> #include <asm/io.h> /* clocksource cycle base type */ typedef u64 cycle_t; +struct clocksource; /** * struct clocksource - hardware abstraction for a free running counter @@ -62,13 +64,22 @@ struct clocksource { cycle_t cycle_last, cycle_interval; u64 xtime_nsec, xtime_interval; s64 error; + +#ifdef CONFIG_CLOCKSOURCE_WATCHDOG + /* Watchdog related data, used by the framework */ + struct list_head wd_list; + cycle_t wd_last; +#endif }; /* * Clock source flags bits:: */ -#define CLOCK_SOURCE_IS_CONTINUOUS 0x01 -#define CLOCK_SOURCE_MUST_VERIFY 0x02 +#define CLOCK_SOURCE_IS_CONTINUOUS 0x01 +#define CLOCK_SOURCE_MUST_VERIFY 0x02 + +#define CLOCK_SOURCE_WATCHDOG 0x10 +#define CLOCK_SOURCE_VALID_FOR_HRES 0x20 /* simplify initialization of mask field */ #define CLOCKSOURCE_MASK(bits) (cycle_t)(bits<64 ? ((1ULL<<bits)-1) : -1) |