Kostik Belousov wrote:
> On Mon, Jun 21, 2010 at 11:09:05PM +0300, Alexander Motin wrote:
>> Alexander Motin wrote:
>>> Kostik Belousov wrote:
>>>> On Sun, Jun 20, 2010 at 09:33:29PM +0000, Alexander Motin wrote:
>>>>> Author: mav
>>>>> Date: Sun Jun 20 21:33:29 2010
>>>>> New Revision: 209371
>>>>> URL: http://svn.freebsd.org/changeset/base/209371
>>>>>
>>>>> Log:
>>>>> Implement new event timers infrastructure. It provides unified APIs for
>>>>> writing event timer drivers, for choosing best possible drivers by
>>>>> machine
>>>>> independent code and for operating them to supply kernel with
>>>>> hardclock(),
>>>>> statclock() and profclock() events in unified fashion on various
>>>>> hardware.
>>>> This broke QEMU for me. I cannot boot FreeBSD guest under QEMU anymore.
>>>> QEMU (not FreeBSD kernel) panics with
>>>> qemu: level-triggered hpet not supported
>>>> message.
>>> According to specification, it is not optional. No more cookies!
> Is there a way to disable hpet at all ? It would be fine with me.
> Does hint below supposed to do this ?
Yes. Hint below disables HPET event timers, leaving only time counter
part, almost same as it was before.
>>>> Setting kern.eventtimer.timer1 to LAPIC or i8254, and timer2 to NONE
>>>> does not help.
>>> Try `hint.apic.0.clock=0` and send me verbose dmesg, I'll try to make
>>> workaround if possible.
>> Sorry, 'hint.hpet.0.clock=0'.
>>
> Setting the hint results in
> panic: lock (time lock) sleep mutex does not match earlier (spin mutex) lock,
> with the backtrace
> enroll()
> witness_init()
> lock_init()
> mtx_init()
> initclocks()
> mi_startup()
> (transribed by hand).
I am surprised that none of my systems fired it. Try this:
--- subr_witness.c.prev 2010-06-17 14:07:36.000000000 +0300
+++ subr_witness.c 2010-06-21 23:43:14.000000000 +0300
@@ -495,6 +495,7 @@ static struct witness_order_list_entry o
#ifdef HWPMC_HOOKS
{ "pmc-sleep", &lock_class_mtx_sleep },
#endif
+ { "time lock", &lock_class_mtx_sleep },
{ NULL, NULL },
/*
* Sockets
@@ -654,7 +655,6 @@ static struct witness_order_list_entry o
{ "callout", &lock_class_mtx_spin },
{ "entropy harvest mutex", &lock_class_mtx_spin },
{ "syscons video lock", &lock_class_mtx_spin },
- { "time lock", &lock_class_mtx_spin },
#ifdef SMP
{ "smp rendezvous", &lock_class_mtx_spin },
#endif
--
Alexander Motin
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