linux-kernel - [PATCH v2 1/2] clocksource: arm_arch_timer: Use stable count reader in erratum sne

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Date:   Tue, 18 Aug 2020 11:28:13 +0800
From:   Keqian Zhu <zhukeqian1@...wei.com>
To:     <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <kvmarm@...ts.cs.columbia.edu>, <kvm@...r.kernel.org>
CC:     Marc Zyngier <maz@...nel.org>, Steven Price <steven.price@....com>,
        "Andrew Jones" <drjones@...hat.com>,
        Catalin Marinas <catalin.marinas@....com>,
        "Will Deacon" <will@...nel.org>, James Morse <james.morse@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        <wanghaibin.wang@...wei.com>, Keqian Zhu <zhukeqian1@...wei.com>
Subject: [PATCH v2 1/2] clocksource: arm_arch_timer: Use stable count reader in erratum sne

In commit 0ea415390cd3 ("clocksource/arm_arch_timer: Use arch_timer_read_counter
to access stable counters"), we separate stable and normal count reader to omit
unnecessary overhead on systems that have no timer erratum.

However, in erratum_set_next_event_tval_generic(), count reader becomes normal
reader. This converts it to stable reader.

Fixes: 0ea415390cd3 ("clocksource/arm_arch_timer: Use
       arch_timer_read_counter to access stable counters")
Signed-off-by: Keqian Zhu <zhukeqian1@...wei.com>
---
 drivers/clocksource/arm_arch_timer.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c
index 6c3e841..777d38c 100644
--- a/drivers/clocksource/arm_arch_timer.c
+++ b/drivers/clocksource/arm_arch_timer.c
@@ -396,10 +396,10 @@ static void erratum_set_next_event_tval_generic(const int access, unsigned long
 	ctrl &= ~ARCH_TIMER_CTRL_IT_MASK;
 
 	if (access == ARCH_TIMER_PHYS_ACCESS) {
-		cval = evt + arch_counter_get_cntpct();
+		cval = evt + arch_counter_get_cntpct_stable();
 		write_sysreg(cval, cntp_cval_el0);
 	} else {
-		cval = evt + arch_counter_get_cntvct();
+		cval = evt + arch_counter_get_cntvct_stable();
 		write_sysreg(cval, cntv_cval_el0);
 	}
 
-- 
1.8.3.1