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drivers: hv: Decouple Hyper-V clock/timer code from VMbus drivers

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Hyper-V clock/timer code in hyperv_timer.c is mostly independent from
other VMbus drivers, but building for ARM64 without hyperv_timer.c
shows some remaining entanglements.  A default implementation of
hv_read_reference_counter can just read a Hyper-V synthetic register
and be independent of hyperv_timer.c, so move this code out and into
hv_common.c. Then it can be used by the timesync driver even if
hyperv_timer.c isn't built on a particular architecture.  If
hyperv_timer.c *is* built, it can override with a faster implementation.

Also provide stubs for stimer functions called by the VMbus driver when
hyperv_timer.c isn't built.

No functional changes.

Signed-off-by: Michael Kelley <mikelley@microsoft.com>
Link: https://lore.kernel.org/r/1626220906-22629-1-git-send-email-mikelley@microsoft.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
This commit is contained in:
Michael Kelley
2021-07-13 17:01:46 -07:00
committed by Wei Liu
parent 5f92b45c3b
commit 31e5e64694
5 changed files with 25 additions and 10 deletions
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3
drivers/clocksource/hyperv_timer.c
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@@ -361,9 +361,6 @@ EXPORT_SYMBOL_GPL(hv_stimer_global_cleanup);
* Hyper-V and 32-bit x86. The TSC reference page version is preferred.
*/
u64 (*hv_read_reference_counter)(void);
EXPORT_SYMBOL_GPL(hv_read_reference_counter);
static union {
struct ms_hyperv_tsc_page page;
u8 reserved[PAGE_SIZE];