linux-kernel - Re: [PATCH] powerpc/32s: Fix napping restore in data storage interrupt (DSI)

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Message-ID: <8fb08f68-ed01-65f9-fb9e-66abf2b18a00@csgroup.eu>
Date:   Wed, 4 Aug 2021 08:21:26 +0200
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Nicholas Piggin <npiggin@...il.com>
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>, userm57@...oo.com,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        Finn Thain <fthain@...ux-m68k.org>
Subject: Re: [PATCH] powerpc/32s: Fix napping restore in data storage
 interrupt (DSI)

Hi Nic,

I think I'll need your help on that one.

Le 04/08/2021 à 08:07, Christophe Leroy a écrit :
> 
> 
> Le 04/08/2021 à 06:04, Finn Thain a écrit :
>> On Tue, 3 Aug 2021, Christophe Leroy wrote:
>>
...
>>
>> ------------[ cut here ]------------
>> kernel BUG at arch/powerpc/kernel/interrupt.c:49!
>> Oops: Exception in kernel mode, sig: 5 [#1]
>> BE PAGE_SIZE=4K MMU=Hash SMP NR_CPUS=2 PowerMac
>> Modules linked in:
>> CPU: 0 PID: 1859 Comm: xfce4-session Not tainted 5.13.0-pmac-VMAP #10
>> NIP:  c0011474 LR: c0011464 CTR: 00000000
>> REGS: e2f75e40 TRAP: 0700   Not tainted  (5.13.0-pmac-VMAP)
>> MSR:  00021032 <ME,IR,DR,RI>  CR: 2400446c  XER: 20000000
>>
>> GPR00: c001604c e2f75f00 ca284a60 00000000 00000000 a5205eb0 00000008 00000020
>> GPR08: ffffffc0 00000001 501200d9 ce030005 ca285010 00c1f778 00000000 00000000
>> GPR16: 00945b20 009402f8 00000001 a6b87550 a51fd000 afb73220 a6b22c78 a6a6aecc
>> GPR24: 00000000 ffffffc0 00000020 00000008 a5205eb0 00000000 e2f75f40 000000ae
>> NIP [c0011474] system_call_exception+0x60/0x164
>> LR [c0011464] system_call_exception+0x50/0x164
>> Call Trace:
>> [e2f75f00] [00009000] 0x9000 (unreliable)
>> [e2f75f30] [c001604c] ret_from_syscall+0x0/0x28
>> --- interrupt: c00 at 0xa69d6cb0
>> NIP:  a69d6cb0 LR: a69d6c3c CTR: 00000000
>> REGS: e2f75f40 TRAP: 0c00   Not tainted  (5.13.0-pmac-VMAP)
>> MSR:  0000d032 <EE,PR,ME,IR,DR,RI>  CR: 2400446c  XER: 20000000
>>
>> GPR00: 000000ae a5205de0 a5687ca0 00000000 00000000 a5205eb0 00000008 00000020
>> GPR08: ffffffc0 401201ea 401200d9 ffffffff c158f230 00c1f778 00000000 00000000
>> GPR16: 00945b20 009402f8 00000001 a6b87550 a51fd000 afb73220 a6b22c78 a6a6aecc
>> GPR24: afb72fc8 00000000 00000001 a5205f30 afb733dc 00000000 a6b85ff4 a5205eb0
>> NIP [a69d6cb0] 0xa69d6cb0
>> LR [a69d6c3c] 0xa69d6c3c
>> --- interrupt: c00
>> Instruction dump:
>> 7cdb3378 93810020 7cbc2b78 93a10024 7c9d2378 93e1002c 7d3f4b78 4800d629
>> 817e0084 931e0088 69690002 5529fffe <0f090000> 69694000 552997fe 0f090000
>> ---[ end trace c66c6c3c44806276 ]---
>>

Getting a BUG at arch/powerpc/kernel/interrupt.c:49 meaning MSR_RI is not set, but the c00 interrupt 
frame shows MSR_RI properly set, so what ?

Thanks
Christophe