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[PATCH 3.13.y-ckt 061/136] clocksource/drivers/vt8500: Increase the minimum delta

From Kamal Mostafa <kamal@canonical.com>
Newsgroups linux.kernel
Subject [PATCH 3.13.y-ckt 061/136] clocksource/drivers/vt8500: Increase the minimum delta
Date 2016-02-02 19:50 +0100
Message-ID <qXObx-7av-45@gated-at.bofh.it> (permalink)
References <qXNIu-6Z3-7@gated-at.bofh.it>
Organization linux.* mail to news gateway

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3.13.11-ckt34 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Roman Volkov <rvolkov@v1ros.org>

commit f9eccf24615672896dc13251410c3f2f33a14f95 upstream.

The vt8500 clocksource driver declares itself as capable to handle the
minimum delay of 4 cycles by passing the value into
clockevents_config_and_register(). The vt8500_timer_set_next_event()
requires the passed cycles value to be at least 16. The impact is that
userspace hangs in nanosleep() calls with small delay intervals.

This problem is reproducible in Linux 4.2 starting from:
c6eb3f70d448 ('hrtimer: Get rid of hrtimer softirq')

From Russell King, more detailed explanation:

"It's a speciality of the StrongARM/PXA hardware. It takes a certain
number of OSCR cycles for the value written to hit the compare registers.
So, if a very small delta is written (eg, the compare register is written
with a value of OSCR + 1), the OSCR will have incremented past this value
before it hits the underlying hardware. The result is, that you end up
waiting a very long time for the OSCR to wrap before the event fires.

So, we introduce a check in set_next_event() to detect this and return
-ETIME if the calculated delta is too small, which causes the generic
clockevents code to retry after adding the min_delta specified in
clockevents_config_and_register() to the current time value.

min_delta must be sufficient that we don't re-trip the -ETIME check - if
we do, we will return -ETIME, forward the next event time, try to set it,
return -ETIME again, and basically lock the system up. So, min_delta
must be larger than the check inside set_next_event(). A factor of two
was chosen to ensure that this situation would never occur.

The PXA code worked on PXA systems for years, and I'd suggest no one
changes this mechanism without access to a wide range of PXA systems,
otherwise they're risking breakage."

Cc: Russell King <linux@arm.linux.org.uk>
Acked-by: Alexey Charkov <alchark@gmail.com>
Signed-off-by: Roman Volkov <rvolkov@v1ros.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
 drivers/clocksource/vt8500_timer.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/clocksource/vt8500_timer.c b/drivers/clocksource/vt8500_timer.c
index ad3c0e8..6e1c784 100644
--- a/drivers/clocksource/vt8500_timer.c
+++ b/drivers/clocksource/vt8500_timer.c
@@ -50,6 +50,8 @@
 
 #define msecs_to_loops(t) (loops_per_jiffy / 1000 * HZ * t)
 
+#define MIN_OSCR_DELTA		16
+
 static void __iomem *regbase;
 
 static cycle_t vt8500_timer_read(struct clocksource *cs)
@@ -80,7 +82,7 @@ static int vt8500_timer_set_next_event(unsigned long cycles,
 		cpu_relax();
 	writel((unsigned long)alarm, regbase + TIMER_MATCH_VAL);
 
-	if ((signed)(alarm - clocksource.read(&clocksource)) <= 16)
+	if ((signed)(alarm - clocksource.read(&clocksource)) <= MIN_OSCR_DELTA)
 		return -ETIME;
 
 	writel(1, regbase + TIMER_IER_VAL);
@@ -160,7 +162,7 @@ static void __init vt8500_timer_init(struct device_node *np)
 		pr_err("%s: setup_irq failed for %s\n", __func__,
 							clockevent.name);
 	clockevents_config_and_register(&clockevent, VT8500_TIMER_HZ,
-					4, 0xf0000000);
+					MIN_OSCR_DELTA * 2, 0xf0000000);
 }
 
 CLOCKSOURCE_OF_DECLARE(vt8500, "via,vt8500-timer", vt8500_timer_init);
-- 
1.9.1

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  [PATCH 3.13.y-ckt 014/136] EDAC, mc_sysfs: Fix freeing bus' name Kamal Mostafa <kamal@canonical.com> - 2016-02-02 20:10 +0100
  [PATCH 3.13.y-ckt 025/136] udf: limit the maximum number of indirect extents in a row Kamal Mostafa <kamal@canonical.com> - 2016-02-02 20:10 +0100
  [PATCH 3.13.y-ckt 018/136] powerpc: Make {cmp}xchg* and their atomic_ versions fully ordered Kamal Mostafa <kamal@canonical.com> - 2016-02-02 20:10 +0100
  [PATCH 3.13.y-ckt 002/136] drm/nv4c/mc: disable msi Kamal Mostafa <kamal@canonical.com> - 2016-02-02 20:10 +0100
  [PATCH 3.13.y-ckt 007/136] KVM: x86: correctly print #AC in traces Kamal Mostafa <kamal@canonical.com> - 2016-02-02 20:10 +0100
  [PATCH 3.13.y-ckt 029/136] NFS: Fix attribute cache revalidation Kamal Mostafa <kamal@canonical.com> - 2016-02-02 20:10 +0100
  [PATCH 3.13.y-ckt 003/136] drm/nouveau/nv46: Change mc subdev oclass from nv44 to nv4c Kamal Mostafa <kamal@canonical.com> - 2016-02-02 20:10 +0100
  [PATCH 3.13.y-ckt 013/136] wlcore/wl12xx: spi: fix oops on firmware load Kamal Mostafa <kamal@canonical.com> - 2016-02-02 20:10 +0100
  [PATCH 3.13.y-ckt 028/136] NFSv4: Don't perform cached access checks before we've OPENed the file Kamal Mostafa <kamal@canonical.com> - 2016-02-02 20:10 +0100
  [PATCH 3.13.y-ckt 004/136] [media] gspca: ov534/topro: prevent a division by 0 Kamal Mostafa <kamal@canonical.com> - 2016-02-02 20:10 +0100
  [PATCH 3.13.y-ckt 006/136] tools lib traceevent: Fix output of %llu for 64 bit values read on 32 bit machines Kamal Mostafa <kamal@canonical.com> - 2016-02-02 20:10 +0100
  [PATCH 3.13.y-ckt 010/136] arm64: Clear out any singlestep state on a ptrace detach operation Kamal Mostafa <kamal@canonical.com> - 2016-02-02 20:10 +0100

csiph-web