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clocksource/drivers/hyper-v: Untangle stimers and timesync from clocksources
[ Upstream commit 0af3e137c1
]
hyperv_timer.c exports hyperv_cs, which is used by stimers and the
timesync mechanism. However, the clocksource dependency is not
needed: these mechanisms only depend on the partition reference
counter (which can be read via a MSR or via the TSC Reference Page).
Introduce the (function) pointer hv_read_reference_counter, as an
embodiment of the partition reference counter read, and export it
in place of the hyperv_cs pointer. The latter can be removed.
This should clarify that there's no relationship between Hyper-V
stimers & timesync and the Linux clocksource abstractions. No
functional or semantic change.
Suggested-by: Michael Kelley <mikelley@microsoft.com>
Signed-off-by: Andrea Parri <parri.andrea@gmail.com>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20200109160650.16150-2-parri.andrea@gmail.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
parent
791c420f42
commit
f23f37fe70
1 changed files with 4 additions and 2 deletions
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@ -233,7 +233,8 @@ static u64 notrace read_hv_clock_tsc(struct clocksource *arg)
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static u64 read_hv_sched_clock_tsc(void)
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{
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return read_hv_clock_tsc(NULL) - hv_sched_clock_offset;
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return (read_hv_clock_tsc(NULL) - hv_sched_clock_offset) *
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(NSEC_PER_SEC / HV_CLOCK_HZ);
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}
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static struct clocksource hyperv_cs_tsc = {
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@ -258,7 +259,8 @@ static u64 notrace read_hv_clock_msr(struct clocksource *arg)
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static u64 read_hv_sched_clock_msr(void)
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{
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return read_hv_clock_msr(NULL) - hv_sched_clock_offset;
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return (read_hv_clock_msr(NULL) - hv_sched_clock_offset) *
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(NSEC_PER_SEC / HV_CLOCK_HZ);
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}
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static struct clocksource hyperv_cs_msr = {
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