/dev/rtc not suspending/resuming properly

/dev/rtc not suspending/resuming properly

[Brad Campbell]

G'day all,

In trying to track down a bug in an application, I think I may have stumbled across one in the kernel.

It would appear that the rtc device is not restoring the state of the PIE control bit when the 
machine goes to sleep and then wakes up again, resulting in the rtc_dropped_irq() being called 
repeatedly until the application accessing /dev/rtc is stopped.

I'm using a vanilla 2.6.17.3 kernel with the suspend2 patch only on x86

I've had a pretty good look at drivers/char/rtc.c and I can't see anywhere it would actually 
suspend/resume in the code, and investigation shows it does not appear to re-init the hardware on 
resume.

Am I missing something obvious?

brad@bklaptop2:~$ uname -a
Linux bklaptop2 2.6.17.3-bkc1 #14 PREEMPT Mon Jul 3 10:07:03 GST 2006 i686 GNU/Linux

brad@bklaptop2:~$ cat /proc/cpuinfo
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 13
model name      : Intel(R) Pentium(R) M processor 1.20GHz
stepping        : 8
cpu MHz         : 600.000
cache size      : 2048 KB
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 2
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat clflush dts acpi 
mmx fxsr sse sse2 ss tm pbe nx up est tm2
bogomips        : 1198.47

brad@bklaptop2:/usr/src/linux-2.6.17.3/drivers/char$ cat /proc/driver/rtc
rtc_time        : 16:29:53
rtc_date        : 2006-07-10
rtc_epoch       : 1900
alarm           : 00:00:00
DST_enable      : no
BCD             : yes
24hr            : yes
square_wave     : no
alarm_IRQ       : no
update_IRQ      : no
periodic_IRQ    : yes
periodic_freq   : 1024
batt_status     : okay


<suspend/resume cycle here>

brad@bklaptop2:/tracks/qemu$ cat /proc/driver/rtc
rtc_time        : 16:32:57
rtc_date        : 2006-07-10
rtc_epoch       : 1900
alarm           : 00:00:00
DST_enable      : no
BCD             : yes
24hr            : yes
square_wave     : no
alarm_IRQ       : no
update_IRQ      : no
periodic_IRQ    : no
periodic_freq   : 1024
batt_status     : okay

brad@bklaptop2:/tracks/qemu$ dmesg | tail
[42971936.150000] rtc: lost some interrupts at 1024Hz.
[42971936.170000] rtc: lost some interrupts at 1024Hz.
[42971936.190000] rtc: lost some interrupts at 1024Hz.
[42971936.210000] rtc: lost some interrupts at 1024Hz.
[42971936.230000] rtc: lost some interrupts at 1024Hz.
[42971936.250000] rtc: lost some interrupts at 1024Hz.
[42971936.270000] rtc: lost some interrupts at 1024Hz.
[42971936.290000] rtc: lost some interrupts at 1024Hz.
[42971936.310000] rtc: lost some interrupts at 1024Hz.
[42971936.330000] rtc: lost some interrupts at 1024Hz.

CONFIG_X86_32=y
CONFIG_SEMAPHORE_SLEEPERS=y
CONFIG_X86=y
CONFIG_MMU=y
CONFIG_GENERIC_ISA_DMA=y
CONFIG_GENERIC_IOMAP=y
CONFIG_GENERIC_HWEIGHT=y
CONFIG_ARCH_MAY_HAVE_PC_FDC=y
CONFIG_DMI=y
CONFIG_EXPERIMENTAL=y
CONFIG_BROKEN_ON_SMP=y
CONFIG_LOCK_KERNEL=y
CONFIG_INIT_ENV_ARG_LIMIT=32
CONFIG_LOCALVERSION="-bkc1"
CONFIG_SWAP=y
CONFIG_SYSVIPC=y
CONFIG_POSIX_MQUEUE=y
CONFIG_BSD_PROCESS_ACCT=y
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CONFIG_SYSCTL=y
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CONFIG_IKCONFIG=y
CONFIG_IKCONFIG_PROC=y
CONFIG_INITRAMFS_SOURCE=""
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CONFIG_VM86=y
CONFIG_KALLSYMS=y
CONFIG_HOTPLUG=y
CONFIG_PRINTK=y
CONFIG_BUG=y
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CONFIG_DEFAULT_IOSCHED="anticipatory"
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CONFIG_PAGE_OFFSET=0xB0000000
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CONFIG_CIFS=m
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CONFIG_NLS=y
CONFIG_NLS_DEFAULT="cp437"
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CONFIG_PRINTK_TIME=y
CONFIG_MAGIC_SYSRQ=y
CONFIG_DEBUG_KERNEL=y
CONFIG_LOG_BUF_SHIFT=17
CONFIG_DEBUG_BUGVERBOSE=y
CONFIG_FORCED_INLINING=y
CONFIG_EARLY_PRINTK=y
CONFIG_STACK_BACKTRACE_COLS=2
CONFIG_X86_FIND_SMP_CONFIG=y
CONFIG_X86_MPPARSE=y
CONFIG_DOUBLEFAULT=y
CONFIG_CRYPTO=y
CONFIG_CRYPTO_HMAC=y
CONFIG_CRYPTO_NULL=y
CONFIG_CRYPTO_MD5=y
CONFIG_CRYPTO_SHA1=y
CONFIG_CRYPTO_DES=y
CONFIG_CRYPTO_AES=y
CONFIG_CRYPTO_ARC4=y
CONFIG_CRYPTO_DEFLATE=y
CONFIG_CRYPTO_LZF=y
CONFIG_CRYPTO_MICHAEL_MIC=y
CONFIG_CRC_CCITT=y
CONFIG_CRC32=y
CONFIG_DYN_PAGEFLAGS=y
CONFIG_ZLIB_INFLATE=y
CONFIG_ZLIB_DEFLATE=y
CONFIG_TEXTSEARCH=y
CONFIG_TEXTSEARCH_KMP=m
CONFIG_TEXTSEARCH_BM=m
CONFIG_TEXTSEARCH_FSM=m
CONFIG_GENERIC_HARDIRQS=y
CONFIG_GENERIC_IRQ_PROBE=y
CONFIG_X86_BIOS_REBOOT=y
CONFIG_KTIME_SCALAR=y


Regards,
Brad
-- 
"Human beings, who are almost unique in having the ability
to learn from the experience of others, are also remarkable
for their apparent disinclination to do so." -- Douglas Adams

Re: /dev/rtc not suspending/resuming properly

[Pavel Machek]

Hi!

> In trying to track down a bug in an application, I think I may have 
> stumbled across one in the kernel.

Well, that happens in suspend/resume area...

> It would appear that the rtc device is not restoring the state of the PIE 
> control bit when the machine goes to sleep and then wakes up again, 
> resulting in the rtc_dropped_irq() being called repeatedly until the 
> application accessing /dev/rtc is stopped.
> 
> I'm using a vanilla 2.6.17.3 kernel with the suspend2 patch only on x86
> 
> I've had a pretty good look at drivers/char/rtc.c and I can't see anywhere 
> it would actually suspend/resume in the code, and investigation shows it 
> does not appear to re-init the hardware on resume.

Well, you probably need to write suspend/resume support for it...

								Pavel

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

Re: /dev/rtc not suspending/resuming properly

[Brad Campbell]

Pavel Machek wrote:

>> I've had a pretty good look at drivers/char/rtc.c and I can't see anywhere 
>> it would actually suspend/resume in the code, and investigation shows it 
>> does not appear to re-init the hardware on resume.
> 
> Well, you probably need to write suspend/resume support for it...

So it would seem..

I know absolutely nothing about the driver model (let alone C or kernel voodo in general) and have 
been investigating Documentation/driver-model. Would I be close if I were to suggest this needs to 
be a platform_driver? I'll certainly have a crack at it if I'm on the right track.

I've been having a look at some of the other drivers that use platform_driver however I'm a bit 
stumped at how I go about iterating through the various sparc buses using the platform_driver 
resource allocation functions.

#ifdef __sparc__
         struct linux_ebus *ebus;
         struct linux_ebus_device *edev;
#ifdef __sparc_v9__
         struct sparc_isa_bridge *isa_br;
         struct sparc_isa_device *isa_dev;
#endif
#endif

Or, do I just dodgy it up as the rtc is a legacy device, and leave the probe/allocation code alone 
and just add the pm stuff?

Brad
-- 
"Human beings, who are almost unique in having the ability
to learn from the experience of others, are also remarkable
for their apparent disinclination to do so." -- Douglas Adams

Re: /dev/rtc not suspending/resuming properly

[Pavel Machek]

On Tue 2006-07-11 11:57:43, Brad Campbell wrote:
> Pavel Machek wrote:
> 
> >>I've had a pretty good look at drivers/char/rtc.c and I can't see 
> >>anywhere it would actually suspend/resume in the code, and investigation 
> >>shows it does not appear to re-init the hardware on resume.
> >
> >Well, you probably need to write suspend/resume support for it...
> 
> So it would seem..
> 
> I know absolutely nothing about the driver model (let alone C or kernel 
> voodo in general) and have been investigating Documentation/driver-model. 
> Would I be close if I were to suggest this needs to be a platform_driver? 
> I'll certainly have a crack at it if I'm on the right track.
> 
> I've been having a look at some of the other drivers that use 
> platform_driver however I'm a bit stumped at how I go about iterating 
> through the various sparc buses using the platform_driver resource 
> allocation functions.
> 
> #ifdef __sparc__
>         struct linux_ebus *ebus;
>         struct linux_ebus_device *edev;
> #ifdef __sparc_v9__
>         struct sparc_isa_bridge *isa_br;
>         struct sparc_isa_device *isa_dev;
> #endif
> #endif

So you are working on sparc?

> Or, do I just dodgy it up as the rtc is a legacy device, and leave the 
> probe/allocation code alone and just add the pm stuff?

I'd do that first, to get it working...
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

Re: /dev/rtc not suspending/resuming properly

[Brad Campbell]

Pavel Machek wrote:

> So you are working on sparc?

No, I'm not.. the x86 part looks relatively easy, but given it appears to be used on multiple 
platforms I was wondering how not to break them in the process..

>> Or, do I just dodgy it up as the rtc is a legacy device, and leave the 
>> probe/allocation code alone and just add the pm stuff?
> 
> I'd do that first, to get it working...

Ta, I'll do that then..

Brad
-- 
"Human beings, who are almost unique in having the ability
to learn from the experience of others, are also remarkable
for their apparent disinclination to do so." -- Douglas Adams

Re: /dev/rtc not suspending/resuming properly

[Pavel Machek]

Hi!

> >So you are working on sparc?
> 
> No, I'm not.. the x86 part looks relatively easy, but given it appears to 
> be used on multiple platforms I was wondering how not to break them in the 
> process..

Well... in that case do it as proper platform_device, then ask sparc
people to fix their platform ;-)).
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html