From: Nicholas Piggin <npiggin@gmail•com>
To: Christophe Leroy <christophe.leroy@csgroup•eu>,
linuxppc-dev@lists•ozlabs.org
Subject: Re: [PATCH 03/18] powerpc: bad_page_fault, do_break get registers from regs
Date: Wed, 11 Nov 2020 16:39:33 +1000 [thread overview]
Message-ID: <1605076126.b04m8ile46.astroid@bobo.none> (raw)
In-Reply-To: <1605069958.zq8gnsvl6e.astroid@bobo.none>
Excerpts from Nicholas Piggin's message of November 11, 2020 2:46 pm:
> Excerpts from Christophe Leroy's message of November 10, 2020 9:19 pm:
>>
>>
>> Le 10/11/2020 à 09:34, Nicholas Piggin a écrit :
>>> Excerpts from Christophe Leroy's message of November 6, 2020 6:14 pm:
>>>>
>>>>
>>>> Le 05/11/2020 à 15:34, Nicholas Piggin a écrit :
>>>>> This also moves the 32s DABR match to C.
>>>>
>>>> Is there a real benefit doing this ?
>>>
>>> Oh I missed doing it, but yes I think bad_page_fault and do_break should
>>> probably be implemented with the DEFINE_INTERRUT_HANDLER wrappers.
>>>
>>
>> Yes, anyway, do we need to do that change ? Can't the dispatch between do_break() and page fault
>> handling remain in handle_page_fault() ? What's the benefit of going into do_page_fault() and coming
>> back ?
>
> You might be right, I'll take another look at it.
For 32-bit, we need to come back to save NV GPRs. Certainly the 64s code
stays in do_page_fault because it always saves them.
Now I don't think that's the nicest thing to go in and out of the
interrupt wrappers twice in these cases, but for a first pass I think
it's okay. Either we could add another type of error-case wrapper that
does some adjustment if it becomes necessary, or we find a nice way to
save NVGPRs from C code.
If we could somehow parse unwind data to find where the NVGPRs are saved
by the compiler and generate a little code stub to load them out, would
be the ultimate :) Maybe one day...
Thanks,
Nick
next prev parent reply other threads:[~2020-11-11 6:42 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-05 14:34 [PATCH 00/18] powerpc: interrupt wrappers Nicholas Piggin
2020-11-05 14:34 ` [PATCH 01/18] powerpc/64s: move the last of the page fault handling logic to C Nicholas Piggin
2020-11-05 21:54 ` kernel test robot
2020-11-05 14:34 ` [PATCH 02/18] powerpc: remove arguments from fault handler functions Nicholas Piggin
2020-11-06 7:59 ` Christophe Leroy
2020-11-10 8:29 ` Nicholas Piggin
2020-11-10 11:15 ` Christophe Leroy
2020-11-11 4:45 ` Nicholas Piggin
2020-11-05 14:34 ` [PATCH 03/18] powerpc: bad_page_fault, do_break get registers from regs Nicholas Piggin
2020-11-05 20:43 ` kernel test robot
2020-11-06 8:14 ` Christophe Leroy
2020-11-10 8:34 ` Nicholas Piggin
2020-11-10 11:19 ` Christophe Leroy
2020-11-11 4:46 ` Nicholas Piggin
2020-11-11 6:39 ` Nicholas Piggin [this message]
2020-11-05 14:34 ` [PATCH 04/18] powerpc: interrupt handler wrapper functions Nicholas Piggin
2020-11-05 14:34 ` [PATCH 05/18] powerpc: add interrupt wrapper entry / exit stub functions Nicholas Piggin
2020-11-05 14:34 ` [PATCH 06/18] powerpc: add interrupt_cond_local_irq_enable helper Nicholas Piggin
2020-11-05 14:34 ` [PATCH 07/18] powerpc/64: context tracking remove _TIF_NOHZ Nicholas Piggin
2020-11-05 14:34 ` [PATCH 08/18] powerpc/64: context tracking move to interrupt wrappers Nicholas Piggin
2020-11-05 14:34 ` [PATCH 09/18] powerpc/64: add context tracking to asynchronous interrupts Nicholas Piggin
2020-11-05 14:34 ` [PATCH 10/18] powerpc/64s: move context tracking exit to interrupt exit path Nicholas Piggin
2020-11-05 14:34 ` [PATCH 11/18] powerpc/64s: reconcile interrupts in C Nicholas Piggin
2020-11-05 14:34 ` [PATCH 12/18] powerpc/64: move account_stolen_time into its own function Nicholas Piggin
2020-11-05 14:34 ` [PATCH 13/18] powerpc/64: entry cpu time accounting in C Nicholas Piggin
2020-11-05 14:34 ` [PATCH 14/18] powerpc: move NMI entry/exit code into wrapper Nicholas Piggin
2020-11-05 14:34 ` [PATCH 15/18] powerpc/64s: move NMI soft-mask handling to C Nicholas Piggin
2020-11-05 14:34 ` [PATCH 16/18] powerpc/64s: runlatch interrupt handling in C Nicholas Piggin
2020-11-05 14:34 ` [PATCH 17/18] powerpc/64s: power4 nap fixup " Nicholas Piggin
2020-11-05 14:34 ` [PATCH 18/18] powerpc/64s: move power4 idle entirely to C Nicholas Piggin
2020-11-06 7:34 ` kernel test robot
2020-11-07 9:43 ` Christophe Leroy
2020-11-10 8:43 ` Nicholas Piggin
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