linux-kernel - [tip:x86/urgent] clockevents/drivers/i8253: Add support for PIT shutdown quirk

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Date:   Sun, 4 Nov 2018 02:09:55 -0800
From:   tip-bot for Michael Kelley <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     marcelo.cerri@...onical.com, mikelley@...rosoft.com,
        devel@...uxdriverproject.org, olaf@...fle.de, jgross@...e.com,
        jasowang@...hat.com, mingo@...nel.org, apw@...onical.com,
        tglx@...utronix.de, daniel.lezcano@...aro.org, hpa@...or.com,
        vkuznets@...hat.com, gregkh@...uxfoundation.org,
        akataria@...are.com, kys@...rosoft.com,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: [tip:x86/urgent] clockevents/drivers/i8253: Add support for PIT
 shutdown quirk

Commit-ID:  35b69a420bfb56b7b74cb635ea903db05e357bec
Gitweb:     https://git.kernel.org/tip/35b69a420bfb56b7b74cb635ea903db05e357bec
Author:     Michael Kelley <mikelley@...rosoft.com>
AuthorDate: Sun, 4 Nov 2018 03:48:54 +0000
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Sun, 4 Nov 2018 11:04:46 +0100

clockevents/drivers/i8253: Add support for PIT shutdown quirk

Add support for platforms where pit_shutdown() doesn't work because of a
quirk in the PIT emulation. On these platforms setting the counter register
to zero causes the PIT to start running again, negating the shutdown.

Provide a global variable that controls whether the counter register is
zero'ed, which platform specific code can override.

Signed-off-by: Michael Kelley <mikelley@...rosoft.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
Cc: "devel@...uxdriverproject.org" <devel@...uxdriverproject.org>
Cc: "daniel.lezcano@...aro.org" <daniel.lezcano@...aro.org>
Cc: "virtualization@...ts.linux-foundation.org" <virtualization@...ts.linux-foundation.org>
Cc: "jgross@...e.com" <jgross@...e.com>
Cc: "akataria@...are.com" <akataria@...are.com>
Cc: "olaf@...fle.de" <olaf@...fle.de>
Cc: "apw@...onical.com" <apw@...onical.com>
Cc: vkuznets <vkuznets@...hat.com>
Cc: "jasowang@...hat.com" <jasowang@...hat.com>
Cc: "marcelo.cerri@...onical.com" <marcelo.cerri@...onical.com>
Cc: KY Srinivasan <kys@...rosoft.com>
Cc: stable@...r.kernel.org
Link: https://lkml.kernel.org/r/1541303219-11142-2-git-send-email-mikelley@microsoft.com

---
 drivers/clocksource/i8253.c | 14 ++++++++++++--
 include/linux/i8253.h       |  1 +
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/clocksource/i8253.c b/drivers/clocksource/i8253.c
index 9c38895542f4..d4350bb10b83 100644
--- a/drivers/clocksource/i8253.c
+++ b/drivers/clocksource/i8253.c
@@ -20,6 +20,13 @@
 DEFINE_RAW_SPINLOCK(i8253_lock);
 EXPORT_SYMBOL(i8253_lock);
 
+/*
+ * Handle PIT quirk in pit_shutdown() where zeroing the counter register
+ * restarts the PIT, negating the shutdown. On platforms with the quirk,
+ * platform specific code can set this to false.
+ */
+bool i8253_clear_counter_on_shutdown __ro_after_init = true;
+
 #ifdef CONFIG_CLKSRC_I8253
 /*
  * Since the PIT overflows every tick, its not very useful
@@ -109,8 +116,11 @@ static int pit_shutdown(struct clock_event_device *evt)
 	raw_spin_lock(&i8253_lock);
 
 	outb_p(0x30, PIT_MODE);
-	outb_p(0, PIT_CH0);
-	outb_p(0, PIT_CH0);
+
+	if (i8253_clear_counter_on_shutdown) {
+		outb_p(0, PIT_CH0);
+		outb_p(0, PIT_CH0);
+	}
 
 	raw_spin_unlock(&i8253_lock);
 	return 0;
diff --git a/include/linux/i8253.h b/include/linux/i8253.h
index e6bb36a97519..8336b2f6f834 100644
--- a/include/linux/i8253.h
+++ b/include/linux/i8253.h
@@ -21,6 +21,7 @@
 #define PIT_LATCH	((PIT_TICK_RATE + HZ/2) / HZ)
 
 extern raw_spinlock_t i8253_lock;
+extern bool i8253_clear_counter_on_shutdown;
 extern struct clock_event_device i8253_clockevent;
 extern void clockevent_i8253_init(bool oneshot);