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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Michael Kelley <mikelley@microsoft.com>,
        Andrea Parri <parri.andrea@gmail.com>,
        Daniel Lezcano <daniel.lezcano@linaro.org>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.5 147/170] clocksource/drivers/hyper-v: Untangle stimers and timesync from clocksources
Date:   Tue, 31 Mar 2020 10:59:21 +0200
Message-Id: <20200331085438.915714636@linuxfoundation.org>
In-Reply-To: <20200331085423.990189598@linuxfoundation.org>
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From: Yubo Xie <yuboxie@microsoft.com>

[ Upstream commit 0af3e137c144377fbaf5025ba784ff5ba7ad40c9 ]

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>
---
 drivers/clocksource/hyperv_timer.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/drivers/clocksource/hyperv_timer.c
+++ b/drivers/clocksource/hyperv_timer.c
@@ -327,7 +327,8 @@ static u64 notrace read_hv_clock_tsc(str
 
 static u64 read_hv_sched_clock_tsc(void)
 {
-	return read_hv_clock_tsc(NULL) - hv_sched_clock_offset;
+	return (read_hv_clock_tsc(NULL) - hv_sched_clock_offset) *
+		(NSEC_PER_SEC / HV_CLOCK_HZ);
 }
 
 static struct clocksource hyperv_cs_tsc = {
@@ -352,7 +353,8 @@ static u64 notrace read_hv_clock_msr(str
 
 static u64 read_hv_sched_clock_msr(void)
 {
-	return read_hv_clock_msr(NULL) - hv_sched_clock_offset;
+	return (read_hv_clock_msr(NULL) - hv_sched_clock_offset) *
+		(NSEC_PER_SEC / HV_CLOCK_HZ);
 }
 
 static struct clocksource hyperv_cs_msr = {