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clocksource/drivers/hyper-v: Untangle stimers and timesync from clocksources

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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
This commit is contained in:
Andrea Parri
2020-01-09 17:06:49 +01:00
committed by Daniel Lezcano
parent b9c60a741f
commit 0af3e137c1
3 changed files with 28 additions and 18 deletions
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2
include/clocksource/hyperv_timer.h
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@@ -30,7 +30,7 @@ extern void hv_stimer_global_cleanup(void);
extern void hv_stimer0_isr(void);
#ifdef CONFIG_HYPERV_TIMER
extern struct clocksource *hyperv_cs;
extern u64 (*hv_read_reference_counter)(void);
extern void hv_init_clocksource(void);
extern struct ms_hyperv_tsc_page *hv_get_tsc_page(void);