From: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
To: <xen-devel@lists.xensource.com>
Cc: <linux-kernel@vger.kernel.org>,
<linux-arm-kernel@lists.infradead.org>, <konrad.wilk@oracle.com>,
<marc.zyngier@arm.com>, <will.deacon@arm.com>,
<Stefano.Stabellini@eu.citrix.com>,
Stefano Stabellini <stefano.stabellini@eu.citrix.com>,
<linux@arm.linux.org.uk>, <john.stultz@linaro.org>,
<catalin.marinas@arm.com>
Subject: [PATCH 1/3] arm_arch_timer: introduce arch_timer_stolen_ticks
Date: Wed, 1 May 2013 20:27:38 +0100 [thread overview]
Message-ID: <1367436460-10183-1-git-send-email-stefano.stabellini@eu.citrix.com> (raw)
In-Reply-To: <alpine.DEB.2.02.1305011939180.5398@kaball.uk.xensource.com>
Introduce a function, called arch_timer_stolen_ticks, called from the
arch_timer interrupt handler to account for stolen ticks.
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
CC: linux@arm.linux.org.uk
CC: john.stultz@linaro.org
CC: catalin.marinas@arm.com
CC: marc.zyngier@arm.com
---
arch/arm/include/asm/arch_timer.h | 5 +++++
drivers/clocksource/arm_arch_timer.c | 6 ++++++
2 files changed, 11 insertions(+), 0 deletions(-)
diff --git a/arch/arm/include/asm/arch_timer.h b/arch/arm/include/asm/arch_timer.h
index 7ade91d..30db413 100644
--- a/arch/arm/include/asm/arch_timer.h
+++ b/arch/arm/include/asm/arch_timer.h
@@ -13,6 +13,11 @@
int arch_timer_of_register(void);
int arch_timer_sched_clock_init(void);
+/* per-platform function to calculate stolen ticks (clock cycles stolen
+ * to the vcpu by the hypervisor).
+ */
+extern void (*arch_timer_stolen_ticks)(void);
+
/*
* These register accessors are marked inline so the compiler can
* nicely work out which register we want, and chuck away the rest of
diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c
index d7ad425..d1ddf0b 100644
--- a/drivers/clocksource/arm_arch_timer.c
+++ b/drivers/clocksource/arm_arch_timer.c
@@ -37,6 +37,8 @@ static int arch_timer_ppi[MAX_TIMER_PPI];
static struct clock_event_device __percpu *arch_timer_evt;
+void (*arch_timer_stolen_ticks)(void);
+
static bool arch_timer_use_virtual = true;
/*
@@ -52,6 +54,10 @@ static inline irqreturn_t timer_handler(const int access,
ctrl |= ARCH_TIMER_CTRL_IT_MASK;
arch_timer_reg_write(access, ARCH_TIMER_REG_CTRL, ctrl);
evt->event_handler(evt);
+
+ if ( arch_timer_stolen_ticks != NULL )
+ arch_timer_stolen_ticks();
+
return IRQ_HANDLED;
}
--
1.7.2.5
next prev parent reply other threads:[~2013-05-01 19:27 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-01 19:27 [PATCH 0/3] xen/arm: account for stolen ticks Stefano Stabellini
2013-05-01 19:27 ` Stefano Stabellini [this message]
2013-05-01 20:36 ` [PATCH 1/3] arm_arch_timer: introduce arch_timer_stolen_ticks Christopher Covington
2013-05-02 8:19 ` [Xen-devel] " Ian Campbell
2013-05-02 21:33 ` Christopher Covington
2013-05-03 10:43 ` Stefano Stabellini
2013-05-03 10:54 ` Marc Zyngier
2013-05-05 16:47 ` Stefano Stabellini
2013-05-06 14:55 ` Christopher Covington
2013-05-06 14:35 ` Konrad Rzeszutek Wilk
2013-05-07 16:17 ` Christopher Covington
2013-05-08 11:19 ` Stefano Stabellini
2013-05-08 11:48 ` Christopher Covington
2013-05-01 19:27 ` [PATCH 2/3] xen: move do_stolen_accounting to drivers/xen/time.c Stefano Stabellini
2013-05-02 8:19 ` [Xen-devel] " Ian Campbell
2013-05-02 18:49 ` Christopher Covington
2013-05-03 8:26 ` [Xen-devel] " Ian Campbell
2013-05-03 10:29 ` Stefano Stabellini
2013-05-01 19:27 ` [PATCH 3/3] xen/arm: account for stolen ticks Stefano Stabellini
2013-05-02 8:21 ` [Xen-devel] " Ian Campbell
2013-05-02 10:38 ` Stefano Stabellini
2013-05-02 10:48 ` Ian Campbell
2013-05-02 10:54 ` Stefano Stabellini
2013-05-02 11:02 ` Ian Campbell
2013-05-02 11:04 ` Stefano Stabellini
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