Drivers: hv: Redo Hyper-V synthetic MSR get/set functions

Current code defines a separate get and set macro for each Hyper-V
synthetic MSR used by the VMbus driver. Furthermore, the get macro
can't be converted to a standard function because the second argument
is modified in place, which is somewhat bad form.

Redo this by providing a single get and a single set function that
take a parameter specifying the MSR to be operated on. Fixup usage
of the get function. Calling locations are no more complex than before,
but the code under arch/x86 and the upcoming code under arch/arm64
is significantly simplified.

Also standardize the names of Hyper-V synthetic MSRs that are
architecture neutral. But keep the old x86-specific names as aliases
that can be removed later when all references (particularly in KVM
code) have been cleaned up in a separate patch series.

No functional change.

Signed-off-by: Michael Kelley <mikelley@microsoft.com>
Reviewed-by: Boqun Feng <boqun.feng@gmail.com>
Link: https://lore.kernel.org/r/1614721102-2241-4-git-send-email-mikelley@microsoft.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>

1 files changed, 12 insertions, 14 deletions

diff --git a/drivers/clocksource/hyperv_timer.c b/drivers/clocksource/hyperv_timer.c
index 269a691bd2c4..c73c1271e8b8 100644
--- a/drivers/clocksource/hyperv_timer.c
+++ b/drivers/clocksource/hyperv_timer.c
@@ -68,14 +68,14 @@ static int hv_ce_set_next_event(unsigned long delta,
 
 	current_tick = hv_read_reference_counter();
 	current_tick += delta;
-	hv_init_timer(0, current_tick);
+	hv_set_register(HV_REGISTER_STIMER0_COUNT, current_tick);
 	return 0;
 }
 
 static int hv_ce_shutdown(struct clock_event_device *evt)
 {
-	hv_init_timer(0, 0);
-	hv_init_timer_config(0, 0);
+	hv_set_register(HV_REGISTER_STIMER0_COUNT, 0);
+	hv_set_register(HV_REGISTER_STIMER0_CONFIG, 0);
 	if (direct_mode_enabled)
 		hv_disable_stimer0_percpu_irq(stimer0_irq);
 
@@ -105,7 +105,7 @@ static int hv_ce_set_oneshot(struct clock_event_device *evt)
 		timer_cfg.direct_mode = 0;
 		timer_cfg.sintx = stimer0_message_sint;
 	}
-	hv_init_timer_config(0, timer_cfg.as_uint64);
+	hv_set_register(HV_REGISTER_STIMER0_CONFIG, timer_cfg.as_uint64);
 	return 0;
 }
 
@@ -331,7 +331,7 @@ static u64 notrace read_hv_clock_tsc(void)
 	u64 current_tick = hv_read_tsc_page(hv_get_tsc_page());
 
 	if (current_tick == U64_MAX)
-		hv_get_time_ref_count(current_tick);
+		current_tick = hv_get_register(HV_REGISTER_TIME_REF_COUNT);
 
 	return current_tick;
 }
@@ -352,9 +352,9 @@ static void suspend_hv_clock_tsc(struct clocksource *arg)
 	u64 tsc_msr;
 
 	/* Disable the TSC page */
-	hv_get_reference_tsc(tsc_msr);
+	tsc_msr = hv_get_register(HV_REGISTER_REFERENCE_TSC);
 	tsc_msr &= ~BIT_ULL(0);
-	hv_set_reference_tsc(tsc_msr);
+	hv_set_register(HV_REGISTER_REFERENCE_TSC, tsc_msr);
 }
 
 
@@ -364,10 +364,10 @@ static void resume_hv_clock_tsc(struct clocksource *arg)
 	u64 tsc_msr;
 
 	/* Re-enable the TSC page */
-	hv_get_reference_tsc(tsc_msr);
+	tsc_msr = hv_get_register(HV_REGISTER_REFERENCE_TSC);
 	tsc_msr &= GENMASK_ULL(11, 0);
 	tsc_msr |= BIT_ULL(0) | (u64)phys_addr;
-	hv_set_reference_tsc(tsc_msr);
+	hv_set_register(HV_REGISTER_REFERENCE_TSC, tsc_msr);
 }
 
 static int hv_cs_enable(struct clocksource *cs)
@@ -389,14 +389,12 @@ static struct clocksource hyperv_cs_tsc = {
 
 static u64 notrace read_hv_clock_msr(void)
 {
-	u64 current_tick;
 	/*
 	 * Read the partition counter to get the current tick count. This count
 	 * is set to 0 when the partition is created and is incremented in
 	 * 100 nanosecond units.
 	 */
-	hv_get_time_ref_count(current_tick);
-	return current_tick;
+	return hv_get_register(HV_REGISTER_TIME_REF_COUNT);
 }
 
 static u64 notrace read_hv_clock_msr_cs(struct clocksource *arg)
@@ -439,10 +437,10 @@ static bool __init hv_init_tsc_clocksource(void)
 	 * (which already has at least the low 12 bits set to zero since
 	 * it is page aligned). Also set the "enable" bit, which is bit 0.
 	 */
-	hv_get_reference_tsc(tsc_msr);
+	tsc_msr = hv_get_register(HV_REGISTER_REFERENCE_TSC);
 	tsc_msr &= GENMASK_ULL(11, 0);
 	tsc_msr = tsc_msr | 0x1 | (u64)phys_addr;
-	hv_set_reference_tsc(tsc_msr);
+	hv_set_register(HV_REGISTER_REFERENCE_TSC, tsc_msr);
 
 	hv_set_clocksource_vdso(hyperv_cs_tsc);
 	clocksource_register_hz(&hyperv_cs_tsc, NSEC_PER_SEC/100);