[PATCH 0/6] PowerPc 8xx TLB/MMU fixes

[Joakim Tjernlund]

Rex Feany <RFeany at mrv.com> wrote on 06/10/2009 00:04:20:
>
> Thus spake Joakim Tjernlund (Joakim.Tjernlund at transmode.se):
>
> > Scott and Rex, please disregard other patches from me and
> > try these out instead.
>
> I have results similar to Scott's. I tried both with and without patch
> 5 & 6, and I also need the tlbia_va in ptep_set_access_flags().
>
> I got this oops:
>
> Unable to handle kernel paging request for data at address 0x00000000
> Faulting instruction address: 0xc000e110
> Oops: Kernel access of bad area, sig: 11 [#1]
> MRV NM2
> NIP: c000e110 LR: c000d520 CTR: 1006bf40
> REGS: c2203dd0 TRAP: 0300   Not tainted  (2.6.32-rc3-00014-gcea49b0-dirty)
> MSR: 00009032 <EE,ME,IR,DR>  CR: 44022422  XER: 20000000
> DAR: 00000000, DSISR: c0000000
> TASK = c21c18c0[69] 'rc.sysinit' THREAD: c2202000
> GPR00: 00000401 c2203e80 c21c18c0 c2203f50 00000000 4000d032 00000000 00000000
> GPR08: 10093eb4 00000000 00009032 c000d514 021c1ad0 10095c50 03ffb000 10006500
> GPR16: 10006508 00000000 00000000 00000000 100a2fc8 021c4238 00000000 00000400
> GPR24: c21a2700 00000002 40000000 00000000 00000000 c2203f50 00000000 00000011
> NIP [c000e110] do_page_fault+0x44/0x5fc
> LR [c000d520] handle_page_fault+0xc/0x80
> Call Trace:
> [c2203e80] [c000e58c] do_page_fault+0x4c0/0x5fc (unreliable)
> [c2203f40] [c000d520] handle_page_fault+0xc/0x80
> Instruction dump:
> 800300a0 7cba2b78 54170036 2f970400 7c9c2378 830200e0 54b6018c 40be000c
> 74ba4820 3ac00000 813d0080 3bc00000 <80a90000> 54a036be 2f80001f 40be0100
> ---[ end trace 99a4d88f7e2f1b60 ]---
>
> this happens in do_page_fault becaose regs->nip is null, so

regs or regs->nip is NULL? Either one does not make sense
In any case it might be a secondary problem as DAR is NULL already when you
enter the page fault.
>
>                 insn = *((unsigned long *)regs->nip);
> c000e110:       80 a9 00 00     lwz     r5,0(r9)
>
> fails.

hmm, I wonder if you managed to invalidate the a kernel TLB?
Are you using pinned kernel TLBs?

   Jocke