kernel panic with pccard insert on recent 7.0 CURRENT

[John-Mark Gurney]

Warner Losh wrote this message on Sat, Jun 16, 2007 at 21:12 -0600:
> In message: <20070617024935.GU4602 at funkthat.com>
>             John-Mark Gurney <gurney_j at resnet.uoregon.edu> writes:
> : Warner Losh wrote this message on Sat, Jun 16, 2007 at 17:33 -0600:
> : > Also, I'm unclear on the difference between FILTER_STRAY and
> : > FILTER_HANDLED.
> : 
> : The interrupt filter is suppose to return one of FILTER_STRAY or
> : FILTER_HANDLED...  If you _HANDLED it return that, otherwise return
> : _STRAY...  If you need to schedule the ithread, return _HANDLED or'd
> : with _SCHEDULE_THREAD...
> 
> Will _HANDLED cause all the other handlers to not get called, or just
> the stray interrupt code from not happening?

It will cause the remaining (not yet called) handlers not to get called...
intr_event_handle calls intr_filter_loop which will return on the first
non-_STRAY handler and return it...  Which intr_event_handle eoi's...

It looks like this code is designed for level triggered interrupts and
not edge triggered...

> : I thought piso fixed the comments, but apparently he hasn't (or hasn't
> : finished committing the patch that includes the comment fixes)...  The
> : comments in bus.h are incorrect...
> : 
> : > In message: <626eb4530706160525o54234621s2de098e64cdeb4fe at mail.gmail.com>
> : >             "Hidetoshi Shimokawa" <simokawa at freebsd.org> writes:
> : > : I think the following patch fix the problem.
> : > : 
> : > : RCS file: /home/ncvs/src/sys/dev/pccard/pccard.c,v
> : > : retrieving revision 1.118
> : > : diff -u -r1.118 pccard.c
> : > : --- pccard.c    31 May 2007 19:29:20 -0000      1.118
> : > : +++ pccard.c    16 Jun 2007 12:23:35 -0000
> : > : @@ -1238,7 +1238,7 @@
> : > :         if (pf->intr_filter != NULL || pf->intr_handler != NULL)
> : > :                 panic("Only one interrupt handler per function allowed");
> : > :         err = bus_generic_setup_intr(dev, child, irq, flags, pccard_filter,
> : > : -           pccard_intr, pf, cookiep);
> : > : +           intr ? pccard_intr : NULL, pf, cookiep);
> : > :         if (err != 0)
> : > :                 return (err);
> : > :         pf->intr_filter = filt;
> : > : 
> : > : 
> : > : On 6/16/07, ?????? <wsk at gddsn.org.cn> wrote:
> : > : > hi, lists
> : > : > i always get Fatal trap while insert a pccard with recent 7.0 current.
> : > : > It seems that Can't recognize the pccard address?
> : > : > thanks with any reply.
> : > : >
> : > : > pccard0:Allocation failed for cfe 13
> : > : > pccard0:Allocation failed for cfe 21
> : > : > uart0: <Bora Telecom Inc Bora 3600 Rev 1.1> at port 0x3e8-0x3ef irq 11
> : > : > function 0 config 29 on pccard0
> : > : > uart0:[FILTER]
> : > : >
> : > : > Fatal trap 12: page fault while in kernel mode
> : > : > cpuid = 0; apic id = 00
> : > : > fault virtual address = 0x0
> : > : > fault code = supervisor read, page not present
> : > : > instruction pointer = 0x20:0x0
> : > : > stack pointer = 0x28:0xe2996cb0
> : > : > frame pointer = 0x28:0xe2996cb8
> : > : > code segment = base 0x0, limit 0xfffff, type 0x1b
> : > : > = DPL 0, pres 1, def32 1, gran 1
> : > : > processor eflags = interrupt enable, resume, IOPL = 0
> : > : > current process = 21 (irq11: cbb0 cbb1+*)
> : > : > [thread pid 21 tid 100013 ]
> : > : > Stopped at 0: *** error reading from address 0 ***
> : > : > db>bt
> : > : > Tracing pid 21 tid 100013 td 0xc3f05c00
> : > : > pccard_intr(c4285e00) at pccard_intr+0x12
> : > : > cbb_func_intr(c4103140,0,c0a493ae,40b,c3f00064,...) at cbb_func_intr|0x51
> : > : > ithread_loop(c404fab0,e2996d38,83fb5be8,ff06fc46,c3f4b804,...) at
> : > : > ithread_loop+0
> : > : > x1b5
> : > : > fork_exit(c074ccd0,c404fab0,e2996d38) at fork_exit+0x57
> : > : > fork_trampoline() at fork_trampoline+0x8
> : > : > --- trap 0, eip = 0, esp = 0xe2996d70, ebp = 0 ---

-- 
  John-Mark Gurney				Voice: +1 415 225 5579

     "All that I will do, has been done, All that I have, has not."