Re: [3/3] 2.6.23-rc6: known regressions v2

Arkadiusz Miskiewicz
2007-09-17T19:45:45Z

On Saturday 15 of September 2007, Rafael J. Wysocki wrote:
> On Saturday, 15 September 2007 04:29, Michal Piotrowski wrote:

> > Subject : resume from ram much slower
> > References : http://lkml.org/lkml/2007/8/10/275
> > Last known good : 2.6.23-rc1 ?
> > Submitter : Arkadiusz Miskiewicz <arekm@maven.pl>
> > Caused-By : ?
> > Handled-By : Rafael J. Wysocki <rjw@sisk.pl>
> > Status : problem is being debugged
>
> Unresolved, bisection might be helpful.

Took 16 hours of bisecting and playing with stuff.

It looks like the problematic patch is 18de5bc4c1f1f1fa5e14f354a7603bd6e9d4e3b6.
bisection was hard and I'm 95% sure that this is the problematic patch.
I'm currently using 2.6.23-rc6 with this reverted and so far resume works as it should.

commit 18de5bc4c1f1f1fa5e14f354a7603bd6e9d4e3b6
Author: Thomas Gleixner <tglx@linutronix.de>
Date: Sat Jul 21 04:37:34 2007 -0700

clockevents: fix resume logic

We need to make sure, that the clockevent devices are resumed, before
the tick is resumed. The current resume logic does not guarantee this.

Add CLOCK_EVT_MODE_RESUME and call the set mode functions of the clock
event devices before resuming the tick / oneshot functionality.

Fixup the existing users.

Thanks to Nigel Cunningham for tracking down a long standing thinko,
which affected the jinxed VAIO.

[akpm@linux-foundation.org: xen build fix]
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: john stultz <johnstul@us.ibm.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/arch/arm/mach-davinci/time.c b/arch/arm/mach-davinci/time.c
index 4d8425d..e96a3dc 100644
--- a/arch/arm/mach-davinci/time.c
+++ b/arch/arm/mach-davinci/time.c
@@ -285,6 +285,8 @@ static void davinci_set_mode(enum clock_event_mode mode,
case CLOCK_EVT_MODE_SHUTDOWN:
t->opts = TIMER_OPTS_DISABLED;
break;
+ case CLOCK_EVT_MODE_RESUME:
+ break;
}
}

diff --git a/arch/arm/mach-imx/time.c b/arch/arm/mach-imx/time.c
index 010f6fa..d86d124 100644
--- a/arch/arm/mach-imx/time.c
+++ b/arch/arm/mach-imx/time.c
@@ -159,6 +159,7 @@ static void imx_set_mode(enum clock_event_mode mode, struct clock_event_device *
break;
case CLOCK_EVT_MODE_SHUTDOWN:
case CLOCK_EVT_MODE_UNUSED:
+ case CLOCK_EVT_MODE_RESUME:
/* Left event sources disabled, no more interrupts appears */
break;
}
diff --git a/arch/arm/mach-ixp4xx/common.c b/arch/arm/mach-ixp4xx/common.c
index 8112f72..23e7fba 100644
--- a/arch/arm/mach-ixp4xx/common.c
+++ b/arch/arm/mach-ixp4xx/common.c
@@ -459,6 +459,8 @@ static void ixp4xx_set_mode(enum clock_event_mode mode,
default:
osrt = opts = 0;
break;
+ case CLOCK_EVT_MODE_RESUME:
+ break;
}

*IXP4XX_OSRT1 = osrt | opts;
diff --git a/arch/arm/mach-omap1/time.c b/arch/arm/mach-omap1/time.c
index 3705d20..237651e 100644
--- a/arch/arm/mach-omap1/time.c
+++ b/arch/arm/mach-omap1/time.c
@@ -156,6 +156,7 @@ static void omap_mpu_set_mode(enum clock_event_mode mode,
break;
case CLOCK_EVT_MODE_UNUSED:
case CLOCK_EVT_MODE_SHUTDOWN:
+ case CLOCK_EVT_MODE_RESUME:
break;
}
}
diff --git a/arch/arm/plat-omap/timer32k.c b/arch/arm/plat-omap/timer32k.c
index 2feceec..b0af014 100644
--- a/arch/arm/plat-omap/timer32k.c
+++ b/arch/arm/plat-omap/timer32k.c
@@ -156,6 +156,8 @@ static void omap_32k_timer_set_mode(enum clock_event_mode mode,
case CLOCK_EVT_MODE_SHUTDOWN:
omap_32k_timer_stop();
break;
+ case CLOCK_EVT_MODE_RESUME:
+ break;
}
}

diff --git a/arch/i386/kernel/apic.c b/arch/i386/kernel/apic.c
index 67824f3..610f44b 100644
--- a/arch/i386/kernel/apic.c
+++ b/arch/i386/kernel/apic.c
@@ -263,6 +263,9 @@ static void lapic_timer_setup(enum clock_event_mode mode,
v |= (APIC_LVT_MASKED | LOCAL_TIMER_VECTOR);
apic_write_around(APIC_LVTT, v);
break;
+ case CLOCK_EVT_MODE_RESUME:
+ /* Nothing to do here */
+ break;
}

local_irq_restore(flags);
diff --git a/arch/i386/kernel/hpet.c b/arch/i386/kernel/hpet.c
index 17d7345..cfbf792 100644
--- a/arch/i386/kernel/hpet.c
+++ b/arch/i386/kernel/hpet.c
@@ -187,6 +187,10 @@ static void hpet_set_mode(enum clock_event_mode mode,
cfg &= ~HPET_TN_ENABLE;
hpet_writel(cfg, HPET_T0_CFG);
break;
+
+ case CLOCK_EVT_MODE_RESUME:
+ hpet_enable_int();
+ break;
}
}

@@ -217,6 +221,7 @@ static struct clocksource clocksource_hpet = {
.mask = HPET_MASK,
.shift = HPET_SHIFT,
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
+ .resume = hpet_start_counter,
};

/*
@@ -291,7 +296,6 @@ int __init hpet_enable(void)

clocksource_register(&clocksource_hpet);

-
if (id & HPET_ID_LEGSUP) {
hpet_enable_int();
hpet_reserve_platform_timers(id);
@@ -524,68 +528,3 @@ irqreturn_t hpet_rtc_interrupt(int irq, void *dev_id)
return IRQ_HANDLED;
}
#endif
-
-
-/*
- * Suspend/resume part
- */
-
-#ifdef CONFIG_PM
-
-static int hpet_suspend(struct sys_device *sys_device, pm_message_t state)
-{
- unsigned long cfg = hpet_readl(HPET_CFG);
-
- cfg &= ~(HPET_CFG_ENABLE|HPET_CFG_LEGACY);
- hpet_writel(cfg, HPET_CFG);
-
- return 0;
-}
-
-static int hpet_resume(struct sys_device *sys_device)
-{
- unsigned int id;
-
- hpet_start_counter();
-
- id = hpet_readl(HPET_ID);
-
- if (id & HPET_ID_LEGSUP)
- hpet_enable_int();
-
- return 0;
-}
-
-static struct sysdev_class hpet_class = {
- set_kset_name("hpet"),
- .suspend = hpet_suspend,
- .resume = hpet_resume,
-};
-
-static struct sys_device hpet_device = {
- .id = 0,
- .cls = &hpet_class,
-};
-
-
-static __init int hpet_register_sysfs(void)
-{
- int err;
-
- if (!is_hpet_capable())
- return 0;
-
- err = sysdev_class_register(&hpet_class);
-
- if (!err) {
- err = sysdev_register(&hpet_device);
- if (err)
- sysdev_class_unregister(&hpet_class);
- }
-
- return err;
-}
-
-device_initcall(hpet_register_sysfs);
-
-#endif
diff --git a/arch/i386/kernel/i8253.c b/arch/i386/kernel/i8253.c
index f8a3c40..931eabe 100644
--- a/arch/i386/kernel/i8253.c
+++ b/arch/i386/kernel/i8253.c
@@ -3,11 +3,11 @@
*
*/
#include <linux/clockchips.h>
-#include <linux/spinlock.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
#include <linux/jiffies.h>
-#include <linux/sysdev.h>
#include <linux/module.h>
-#include <linux/init.h>
+#include <linux/spinlock.h>

#include <asm/smp.h>
#include <asm/delay.h>
@@ -41,26 +41,24 @@ static void init_pit_timer(enum clock_event_mode mode,
case CLOCK_EVT_MODE_PERIODIC:
/* binary, mode 2, LSB/MSB, ch 0 */
outb_p(0x34, PIT_MODE);
- udelay(10);
outb_p(LATCH & 0xff , PIT_CH0); /* LSB */
- udelay(10);
outb(LATCH >> 8 , PIT_CH0); /* MSB */
break;

- /*
- * Avoid unnecessary state transitions, as it confuses
- * Geode / Cyrix based boxen.
- */
case CLOCK_EVT_MODE_SHUTDOWN:
- if (evt->mode == CLOCK_EVT_MODE_UNUSED)
- break;
case CLOCK_EVT_MODE_UNUSED:
- if (evt->mode == CLOCK_EVT_MODE_SHUTDOWN)
- break;
+ outb_p(0x30, PIT_MODE);
+ outb_p(0, PIT_CH0); /* LSB */
+ outb_p(0, PIT_CH0); /* MSB */
+ break;
+
case CLOCK_EVT_MODE_ONESHOT:
/* One shot setup */
outb_p(0x38, PIT_MODE);
- udelay(10);
+ break;
+
+ case CLOCK_EVT_MODE_RESUME:
+ /* Nothing to do here */
break;
}
spin_unlock_irqrestore(&i8253_lock, flags);
diff --git a/arch/i386/kernel/vmiclock.c b/arch/i386/kernel/vmiclock.c
index f9b845f..d23077c 100644
--- a/arch/i386/kernel/vmiclock.c
+++ b/arch/i386/kernel/vmiclock.c
@@ -142,6 +142,7 @@ static void vmi_timer_set_mode(enum clock_event_mode mode,

switch (mode) {
case CLOCK_EVT_MODE_ONESHOT:
+ case CLOCK_EVT_MODE_RESUME:
break;
case CLOCK_EVT_MODE_PERIODIC:
cycles_per_hz = vmi_timer_ops.get_cycle_frequency();
diff --git a/arch/i386/xen/time.c b/arch/i386/xen/time.c
index 51fdabf..dfd6db6 100644
--- a/arch/i386/xen/time.c
+++ b/arch/i386/xen/time.c
@@ -412,6 +412,7 @@ static void xen_timerop_set_mode(enum clock_event_mode mode,
break;

case CLOCK_EVT_MODE_ONESHOT:
+ case CLOCK_EVT_MODE_RESUME:
break;

case CLOCK_EVT_MODE_UNUSED:
@@ -474,6 +475,8 @@ static void xen_vcpuop_set_mode(enum clock_event_mode mode,
HYPERVISOR_vcpu_op(VCPUOP_stop_periodic_timer, cpu, NULL))
BUG();
break;
+ case CLOCK_EVT_MODE_RESUME:
+ break;
}
}

diff --git a/arch/sh/kernel/timers/timer-tmu.c b/arch/sh/kernel/timers/timer-tmu.c
index 097ebd4..7aca37d 100644
--- a/arch/sh/kernel/timers/timer-tmu.c
+++ b/arch/sh/kernel/timers/timer-tmu.c
@@ -80,6 +80,7 @@ static void tmu_set_mode(enum clock_event_mode mode,
break;
case CLOCK_EVT_MODE_UNUSED:
case CLOCK_EVT_MODE_SHUTDOWN:
+ case CLOCK_EVT_MODE_RESUME:
break;
}
}
diff --git a/arch/sparc64/kernel/time.c b/arch/sparc64/kernel/time.c
index e340eb4..87c10a7 100644
--- a/arch/sparc64/kernel/time.c
+++ b/arch/sparc64/kernel/time.c
@@ -931,6 +931,7 @@ static void sparc64_timer_setup(enum clock_event_mode mode,
{
switch (mode) {
case CLOCK_EVT_MODE_ONESHOT:
+ case CLOCK_EVT_MODE_RESUME:
break;

case CLOCK_EVT_MODE_SHUTDOWN:
diff --git a/drivers/lguest/lguest.c b/drivers/lguest/lguest.c
index 434fea1..18dade0 100644
--- a/drivers/lguest/lguest.c
+++ b/drivers/lguest/lguest.c
@@ -398,6 +398,8 @@ static void lguest_clockevent_set_mode(enum clock_event_mode mode,
break;
case CLOCK_EVT_MODE_PERIODIC:
BUG();
+ case CLOCK_EVT_MODE_RESUME:
+ break;
}
}

diff --git a/include/linux/clockchips.h b/include/linux/clockchips.h
index 8d7a390..e0bd46e 100644
--- a/include/linux/clockchips.h
+++ b/include/linux/clockchips.h
@@ -23,6 +23,7 @@ enum clock_event_mode {
CLOCK_EVT_MODE_SHUTDOWN,
CLOCK_EVT_MODE_PERIODIC,
CLOCK_EVT_MODE_ONESHOT,
+ CLOCK_EVT_MODE_RESUME,
};

/* Clock event notification values */
diff --git a/kernel/time/tick-broadcast.c b/kernel/time/tick-broadcast.c
index 8001d37..8339af2 100644
--- a/kernel/time/tick-broadcast.c
+++ b/kernel/time/tick-broadcast.c
@@ -49,7 +49,7 @@ cpumask_t *tick_get_broadcast_mask(void)
*/
static void tick_broadcast_start_periodic(struct clock_event_device *bc)
{
- if (bc && bc->mode == CLOCK_EVT_MODE_SHUTDOWN)
+ if (bc)
tick_setup_periodic(bc, 1);
}

@@ -299,7 +299,7 @@ void tick_suspend_broadcast(void)
spin_lock_irqsave(&tick_broadcast_lock, flags);

bc = tick_broadcast_device.evtdev;
- if (bc && tick_broadcast_device.mode == TICKDEV_MODE_PERIODIC)
+ if (bc)
clockevents_set_mode(bc, CLOCK_EVT_MODE_SHUTDOWN);

spin_unlock_irqrestore(&tick_broadcast_lock, flags);
@@ -316,6 +316,8 @@ int tick_resume_broadcast(void)
bc = tick_broadcast_device.evtdev;

if (bc) {
+ clockevents_set_mode(bc, CLOCK_EVT_MODE_RESUME);
+
switch (tick_broadcast_device.mode) {
case TICKDEV_MODE_PERIODIC:
if(!cpus_empty(tick_broadcast_mask))
diff --git a/kernel/time/tick-common.c b/kernel/time/tick-common.c
index a96ec9a..77a21ab 100644
--- a/kernel/time/tick-common.c
+++ b/kernel/time/tick-common.c
@@ -318,12 +318,17 @@ static void tick_resume(void)
{
struct tick_device *td = &__get_cpu_var(tick_cpu_device);
unsigned long flags;
+ int broadcast = tick_resume_broadcast();

spin_lock_irqsave(&tick_device_lock, flags);
- if (td->mode == TICKDEV_MODE_PERIODIC)
- tick_setup_periodic(td->evtdev, 0);
- else
- tick_resume_oneshot();
+ clockevents_set_mode(td->evtdev, CLOCK_EVT_MODE_RESUME);
+
+ if (!broadcast) {
+ if (td->mode == TICKDEV_MODE_PERIODIC)
+ tick_setup_periodic(td->evtdev, 0);
+ else
+ tick_resume_oneshot();
+ }
spin_unlock_irqrestore(&tick_device_lock, flags);
}

@@ -360,8 +365,7 @@ static int tick_notify(struct notifier_block *nb, unsigned long reason,
break;

case CLOCK_EVT_NOTIFY_RESUME:
- if (!tick_resume_broadcast())
- tick_resume();
+ tick_resume();
break;

default:

>
> Greetings,
> Rafael

--
Arkadiusz Miśkiewicz PLD/Linux Team
arekm / maven.pl http://ftp.pld-linux.org/