From: Nicholas Piggin <npiggin@gmail.com>
To: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: linuxppc-dev@lists.ozlabs.org
Subject: Re: [RFC PATCH 02/12] powerpc: remove arguments from interrupt handler functions
Date: Tue, 08 Sep 2020 17:48:46 +1000 [thread overview]
Message-ID: <1599551224.3zoap14y55.astroid@bobo.none> (raw)
In-Reply-To: <1599478457.27656.1.camel@po17688vm.idsi0.si.c-s.fr>
Excerpts from Christophe Leroy's message of September 7, 2020 9:34 pm:
> On Mon, 2020-09-07 at 11:20 +0200, Christophe Leroy wrote:
>>
>> Le 05/09/2020 à 19:43, Nicholas Piggin a écrit :
>> > Make interrupt handlers all just take the pt_regs * argument and load
>> > DAR/DSISR etc from that. Make those that return a value return long.
>>
>> I like this, it will likely simplify a bit the VMAP_STACK mess.
>>
>> Not sure it is that easy. My board is stuck after the start of init.
>>
>>
>> On the 8xx, on Instruction TLB Error exception, we do
>>
>> andis. r5,r9,DSISR_SRR1_MATCH_32S@h /* Filter relevant SRR1 bits */
>>
>> On book3s/32, on ISI exception we do:
>> andis. r5,r9,DSISR_SRR1_MATCH_32S@h /* Filter relevant SRR1 bits */
>>
>> On 40x and bookE, on ISI exception we do:
>> li r5,0 /* Pass zero as arg3 */
>>
>>
>> And regs->dsisr will just contain nothing
>>
>> So it means we should at least write back r5 into regs->dsisr from there
>> ? The performance impact should be minimal as we already write _DAR so
>> the cache line should already be in the cache.
>>
>> A hacky 'stw r5, _DSISR(r1)' in handle_page_fault() does the trick,
>> allthough we don't want to do it for both ISI and DSI at the end, so
>> you'll have to do it in every head_xxx.S
>
> To get you series build and work, I did the following hacks:
Great, thanks for this.
> diff --git a/arch/powerpc/include/asm/interrupt.h
> b/arch/powerpc/include/asm/interrupt.h
> index acfcc7d5779b..c11045d3113a 100644
> --- a/arch/powerpc/include/asm/interrupt.h
> +++ b/arch/powerpc/include/asm/interrupt.h
> @@ -93,7 +93,9 @@ static inline void interrupt_nmi_exit_prepare(struct
> pt_regs *regs, struct inter
> {
> nmi_exit();
>
> +#ifdef CONFIG_PPC64
> this_cpu_set_ftrace_enabled(state->ftrace_enabled);
> +#endif
This seems okay, not a hack.
> #ifdef CONFIG_PPC_BOOK3S_64
> /* Check we didn't change the pending interrupt mask. */
> diff --git a/arch/powerpc/kernel/entry_32.S
> b/arch/powerpc/kernel/entry_32.S
> index f4d0af8e1136..66f7adbe1076 100644
> --- a/arch/powerpc/kernel/entry_32.S
> +++ b/arch/powerpc/kernel/entry_32.S
> @@ -663,6 +663,7 @@ ppc_swapcontext:
> */
> .globl handle_page_fault
> handle_page_fault:
> + stw r5,_DSISR(r1)
> addi r3,r1,STACK_FRAME_OVERHEAD
> #ifdef CONFIG_PPC_BOOK3S_32
> andis. r0,r5,DSISR_DABRMATCH@h
Is this what you want to do for 32, or do you want to seperate
ISI and DSI sides?
Thanks,
Nick
next prev parent reply other threads:[~2020-09-08 8:30 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-05 17:43 [RFC PATCH 00/12] interrupt entry wrappers Nicholas Piggin
2020-09-05 17:43 ` [RFC PATCH 01/12] powerpc/64s: move the last of the page fault handling logic to C Nicholas Piggin
2020-09-05 17:43 ` [RFC PATCH 02/12] powerpc: remove arguments from interrupt handler functions Nicholas Piggin
2020-09-07 9:20 ` Christophe Leroy
2020-09-07 11:34 ` Christophe Leroy
2020-09-08 7:48 ` Nicholas Piggin [this message]
2020-09-08 8:29 ` Christophe Leroy
2020-09-08 8:50 ` Christophe Leroy
2020-09-08 7:46 ` Nicholas Piggin
2020-09-05 17:43 ` [RFC PATCH 03/12] powerpc: interrupt handler wrapper functions Nicholas Piggin
2020-09-05 17:43 ` [RFC PATCH 04/12] powerpc: add interrupt_cond_local_irq_enable helper Nicholas Piggin
2020-09-05 17:43 ` [RFC PATCH 05/12] powerpc/64s: Do context tracking in interrupt entry wrapper Nicholas Piggin
2020-09-05 17:43 ` [RFC PATCH 06/12] powerpc/64s: reconcile interrupts in C Nicholas Piggin
2020-09-05 17:43 ` [RFC PATCH 07/12] powerpc/64: move account_stolen_time into its own function Nicholas Piggin
2020-09-05 17:43 ` [RFC PATCH 08/12] powerpc/64: entry cpu time accounting in C Nicholas Piggin
2020-09-05 17:43 ` [RFC PATCH 09/12] powerpc: move NMI entry/exit code into wrapper Nicholas Piggin
2020-09-07 8:25 ` Christophe Leroy
2020-09-05 17:43 ` [RFC PATCH 10/12] powerpc/64s: move NMI soft-mask handling to C Nicholas Piggin
2020-09-05 17:43 ` [RFC PATCH 11/12] powerpc/64s: runlatch interrupt handling in C Nicholas Piggin
2020-09-05 17:43 ` [RFC PATCH 12/12] powerpc/64s: power4 nap fixup " Nicholas Piggin
2020-09-06 7:32 ` Christophe Leroy
2020-09-07 4:02 ` Nicholas Piggin
2020-09-07 4:48 ` Christophe Leroy
2020-09-07 13:05 ` Nicholas Piggin
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1599551224.3zoap14y55.astroid@bobo.none \
--to=npiggin@gmail.com \
--cc=christophe.leroy@csgroup.eu \
--cc=linuxppc-dev@lists.ozlabs.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).