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2014-07-24timekeeping: Restructure the timekeeper some moreThomas Gleixner2-20/+19
Access to time requires to touch two cachelines at minimum 1) The timekeeper data structure 2) The clocksource data structure The access to the clocksource data structure can be avoided as almost all clocksource implementations ignore the argument to the read callback, which is a pointer to the clocksource. But the core needs to touch it to access the members @read and @mask. So we are better off by copying the @read function pointer and the @mask from the clocksource to the core data structure itself. For the most used ktime_get() access all required data including the @read and @mask copies fits together with the sequence counter into a single 64 byte cacheline. For the other time access functions we touch in the current code three cache lines in the worst case. But with the clocksource data copies we can reduce that to two adjacent cachelines, which is more efficient than disjunct cache lines. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
2014-07-24clocksource: Get rid of cycle_lastThomas Gleixner10-26/+24
cycle_last was added to the clocksource to support the TSC validation. We moved that to the core code, so we can get rid of the extra copy. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
2014-07-24clocksource: Move cycle_last validation to core codeThomas Gleixner4-12/+24
The only user of the cycle_last validation is the x86 TSC. In order to provide NMI safe accessor functions for clock monotonic and monotonic_raw we need to do that in the core. We can't do the TSC specific if (now < cycle_last) now = cycle_last; for the other wrapping around clocksources, but TSC has CLOCKSOURCE_MASK(64) which actually does not mask out anything so if now is less than cycle_last the subtraction will give a negative result. So we can check for that in clocksource_delta() and return 0 for that case. Implement and enable it for x86 Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
2014-07-24clocksource: Make delta calculation a functionThomas Gleixner3-17/+27
We want to move the TSC sanity check into core code to make NMI safe accessors to clock monotonic[_raw] possible. For this we need to sanity check the delta calculation. Create a helper function and convert all sites to use it. [ Build fix from jstultz ] Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
2014-07-24wireless: ath9k: Get rid of timespec conversionsThomas Gleixner1-5/+2
We have interfaces. Remove the open coded cruft. Reduces text size along with the code. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: QCA ath9k Development <ath9k-devel@qca.qualcomm.com> Cc: John W. Linville <linville@tuxdriver.com> Signed-off-by: John Stultz <john.stultz@linaro.org>
2014-07-24drm: vmwgfx: Use nsec based interfacesThomas Gleixner2-32/+16
No point in converting timespecs back and forth. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Thomas Hellstrom <thellstrom@vmware.com> Signed-off-by: John Stultz <john.stultz@linaro.org>
2014-07-24drm: i915: Use nsec based interfacesThomas Gleixner3-29/+18
Use ktime_get_raw_ns() and get rid of the back and forth timespec conversions. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by: John Stultz <john.stultz@linaro.org>
2014-07-24timekeeping: Provide ktime_get_raw()Thomas Gleixner3-0/+34
Provide a ktime_t based interface for raw monotonic time. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
2014-07-24hangcheck-timer: Use ktime_get_ns()Thomas Gleixner1-28/+5
There is no point in having a S390 private implementation and there is no point in using the raw monotonic time. The NTP freqeuency adjustment of CLOCK_MONOTONIC is really not doing any harm for the hang check timer. Use ktime_get_ns() for everything and get rid of the timespec conversions. V2: Drop the raw monotonic and the S390 special case Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: John Stultz <john.stultz@linaro.org>
2014-07-24timekeeping: Simplify timekeeping_clocktai()Thomas Gleixner2-31/+5
timekeeping_clocktai() is not used in fast pathes, so the extra timespec conversion is not problematic. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
2014-07-24timekeeping: Remove timekeeper.total_sleep_timeThomas Gleixner2-15/+5
No more users. Remove it Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
2014-07-24timekeeping: Simplify getboottime()Thomas Gleixner1-8/+3
Subtracting plain nsec values and converting to timespec is simpler than the whole timespec math. Not really fastpath code, so the division is not an issue. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
2014-07-24timekeeping: Use ktime_get_boottime() for get_monotonic_boottime()Thomas Gleixner2-35/+8
get_monotonic_boottime() is not used in fast pathes, so the extra timespec conversion is not problematic. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
2014-07-24timekeeping: Remove monotonic_to_bootbasedThomas Gleixner2-16/+0
No more users. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
2014-07-24x86: kvm: Make kvm_get_time_and_clockread() nanoseconds basedThomas Gleixner1-30/+14
Convert the relevant base data right away to nanoseconds instead of doing the conversion on every readout. Reduces text size by 160 bytes. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Gleb Natapov <gleb@kernel.org> Cc: kvm@vger.kernel.org Acked-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: John Stultz <john.stultz@linaro.org>
2014-07-24x86: kvm: Use ktime_get_boot_ns()Thomas Gleixner1-5/+1
Use the new nanoseconds based interface and get rid of the timespec conversion dance. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Gleb Natapov <gleb@kernel.org> Cc: kvm@vger.kernel.org Acked-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: John Stultz <john.stultz@linaro.org>
2014-07-24arm: bL_switcher:k Use ktime_get_real_ns()Thomas Gleixner1-13/+3
Use the nanoseconds based interface instead of converting from a timespec. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Russell King <linux@arm.linux.org.uk> Cc: linux-arm-kernel@lists.infradead.org Signed-off-by: John Stultz <john.stultz@linaro.org>
2014-07-24iio: Use ktime_get_real_ns()Thomas Gleixner1-8/+1
No idea why iio needs wall clock based time stamps, but we can avoid the timespec conversion dance by using the new interfaces. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Jonathan Cameron <jic23@kernel.org> Signed-off-by: John Stultz <john.stultz@linaro.org>
2014-07-24hwmon: ibmaem: Use ktime_get_ns()Thomas Gleixner1-4/+2
Using the wall clock time for delta time calculations is wrong to begin with because wall clock time can be set from userspace and NTP. Such data wants to be based on clock monotonic. The calculations also are done on a nanosecond basis. Use the nanoseconds based interface right away. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Jean Delvare <jdelvare@suse.de> Acked-by: Jean Delvare <jdelvare@suse.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
2014-07-24fs: lockd: Use ktime_get_ns()Thomas Gleixner1-3/+1
Replace the ever recurring: ts = ktime_get_ts(); ns = timespec_to_ns(&ts); with ns = ktime_get_ns(); Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Trond Myklebust <trond.myklebust@primarydata.com> Cc: "J. Bruce Fields" <bfields@fieldses.org> Signed-off-by: John Stultz <john.stultz@linaro.org>
2014-07-24net: mlx5: Use ktime_get_ns()Thomas Gleixner2-14/+6
This code is beyond silly: struct timespec ts = ktime_get_ts(); ktime_t ktime = timespec_to_ktime(ts); Further down the code builds the delta of two ktime_t values and converts the result to nanoseconds. Use ktime_get_ns() and replace all the nonsense. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Eli Cohen <eli@mellanox.com> Signed-off-by: John Stultz <john.stultz@linaro.org>
2014-07-24misc: ioc4: Use ktime_get_ns()Thomas Gleixner1-5/+2
Replace the ever recurring: ts = ktime_get_ts(); ns = timespec_to_ns(&ts); with ns = ktime_get_ns(); Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: John Stultz <john.stultz@linaro.org>
2014-07-24mfd: cros_ec_spi: Use ktime_get_ns()Thomas Gleixner1-6/+2
Replace the ever recurring: ts = ktime_get_ts(); ns = timespec_to_ns(&ts); with ns = ktime_get_ns(); Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: John Stultz <john.stultz@linaro.org>
2014-07-23connector: Use ktime_get_ns()Thomas Gleixner1-27/+9
Replace the ever recurring: ts = ktime_get_ts(); ns = timespec_to_ns(&ts); with ns = ktime_get_ns(); Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Evgeniy Polyakov <zbr@ioremap.net> Signed-off-by: John Stultz <john.stultz@linaro.org>
2014-07-23powerpc: cell: Use ktime_get_ns()Thomas Gleixner4-17/+6
Replace the ever recurring: ts = ktime_get_ts(); ns = timespec_to_ns(&ts); with ns = ktime_get_ns(); Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
2014-07-23delayacct: Remove braindamaged type conversionsThomas Gleixner1-11/+7
Converting cputime to timespec and timespec to nanoseconds makes no sense. Use cputime_to_ns() and be done with it. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
2014-07-23delayacct: Make accounting nanosecond basedThomas Gleixner2-24/+14
Kill the timespec juggling and calculate with plain nanoseconds. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
2014-07-23sched: Make task->start_time nanoseconds basedThomas Gleixner4-19/+14
Simplify the timespec to nsec/usec conversions. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
2014-07-23sched: Make task->real_start_time nanoseconds basedThomas Gleixner3-9/+3
Simplify the only user of this data by removing the timespec conversion. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
2014-07-23time: Export nsecs_to_jiffies()Thomas Gleixner1-0/+1
Required for moving drivers to the nanosecond based interfaces. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
2014-07-23timekeeping: Provide ktime_get[*]_ns() helpersThomas Gleixner1-0/+15
A lot of code converts either timespecs or ktime_t to nanoseconds. Provide helper functions. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
2014-07-23timekeeping: Remove ktime_get_monotonic_offset()Thomas Gleixner2-19/+0
No more users. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
2014-07-23drm: Use ktime_mono_to_real()Thomas Gleixner1-13/+3
Convert the monotonic timestamp with ktime_mono_to_real() in drm_calc_vbltimestamp_from_scanoutpos(). In get_drm_timestamp we can call either ktime_get() or ktime_get_real() depending on drm_timestamp_monotonic. No point in having two calls into the core for CLOCK_REALTIME. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
2014-07-23input: evdev: Use ktime_mono_to_real()Thomas Gleixner1-4/+3
Convert the monotonic timestamp with ktime_mono_to_real() in evdev_events(). In evdev_queue_syn_dropped() we can call either ktime_get() or ktime_get_real() depending on the clkid. No point in having two calls for CLOCK_REALTIME. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
2014-07-23timerfd: Use ktime_mono_to_real()Thomas Gleixner1-3/+3
We have a few other use cases of ktime_get_monotonic_offset() which can be optimized with ktime_mono_to_real(). The timerfd code uses the offset only for comparison, so we can use ktime_mono_to_real(0) for this as well. Funny enough text size shrinks with that on ARM and x8664 !? Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
2014-07-23timekeeping: Provide ktime_mono_to_any()Thomas Gleixner2-0/+29
ktime based conversion function to map a monotonic time stamp to a different CLOCK. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
2014-07-23timekeeping; Use ktime based data for ktime_get_update_offsets_tick()Thomas Gleixner1-6/+6
No need to juggle with timespecs. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
2014-07-23timekeeping: Use ktime_t data for ktime_get_update_offsets_now()Thomas Gleixner1-6/+4
No need to juggle with timespecs. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
2014-07-23timekeeping: Use ktime_t based data for ktime_get_clocktai()Thomas Gleixner2-16/+8
Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
2014-07-23timekeeping; Use ktime_t based data for ktime_get_boottime()Thomas Gleixner2-18/+11
Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
2014-07-23timekeeping: Use ktime_t based data for ktime_get_real()Thomas Gleixner2-16/+8
Speed up the readout. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
2014-07-23timekeeping: Provide ktime_get_with_offset()Thomas Gleixner2-0/+36
Provide a helper function which lets us implement ktime_t based interfaces for real, boot and tai clocks. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
2014-07-23timekeeping: Use ktime_t based data for ktime_get()Thomas Gleixner1-4/+5
Speed up ktime_get() by using ktime_t based data. Text size shrinks by 64 bytes on x8664. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
2014-07-23timekeeping: Provide internal ktime_t based dataThomas Gleixner2-0/+25
The ktime_t based interfaces are used a lot in performance critical code pathes. Add ktime_t based data so the interfaces don't have to convert from the xtime/timespec based data. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
2014-07-23timekeeping: Use timekeeping_update() instead of memcpy()Thomas Gleixner1-2/+1
We already have a function which does the right thing, that also makes sure that the coming ktime_t based cached values are getting updated. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
2014-07-23timekeeping: Cache optimize struct timekeeperThomas Gleixner2-126/+143
struct timekeeper is quite badly sorted for the hot readout path. Most time access functions need to load two cache lines. Rearrange it so ktime_get() and getnstimeofday() are happy with a single cache line. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
2014-07-23timekeeper: Move tk_xtime to core codeThomas Gleixner2-45/+43
No users outside of the core. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
2014-07-23timekeeping: Provide timespec64 based interfacesThomas Gleixner3-33/+87
To convert callers of the core code to timespec64 we need to provide the proper interfaces. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
2014-07-23time: Consolidate the time accessor prototypesThomas Gleixner9-58/+111
Right now we have time related prototypes in 3 different header files. Move it to a single timekeeping header file and move the core internal stuff into a core private header. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
2014-07-23timekeeping: Convert timekeeping core to use timespec64sJohn Stultz6-87/+109
Convert the core timekeeping logic to use timespec64s. This moves the 2038 issues out of the core logic and into all of the accessor functions. Future changes will need to push the timespec64s out to all timekeeping users, but that can be done interface by interface. Signed-off-by: John Stultz <john.stultz@linaro.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
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