From: Michael Ellerman <mpe@ellerman•id.au>
To: Hari Bathini <hbathini@linux•vnet.ibm.com>,
linuxppc-dev <linuxppc-dev@ozlabs•org>
Cc: Mahesh J Salgaonkar <mahesh@linux•vnet.ibm.com>,
Michael Neuling <mikey@neuling•org>,
Paul Mackerras <paulus@samba•org>
Subject: Re: [v4, 2/3] ppc64/book3s: make some room for common interrupt vector code
Date: Fri, 15 Apr 2016 22:59:57 +1000 [thread overview]
Message-ID: <1460725197.22415.7.camel@ellerman.id.au> (raw)
In-Reply-To: <3qmZVp4lgdz9t5C@ozlabs.org>
On Fri, 2016-04-15 at 21:06 +1000, Michael Ellerman wrote:
> Hi Hari,
>
> Thanks for persisting with this.
>
> On Thu, 2016-07-04 at 21:58:50 UTC, Hari Bathini wrote:
> > With the previous patch, we choke out whatever little space is left
> > below 0x7000 (FWNMI hard block) while there is a hole of ~1400 bytes
> > below __end_interrupts marker when CONFIG_CBE_RAS is disabled.
> > Considering CONFIG_CBE_RAS is not enabled by default for BOOK3S, this
> > is not a desirable scenario especially when we have to worry about
> > each additional instruction that goes below 0x7000.
> >
> > Memory region from 0x1800 to 0x4000 is dedicated for common interrupt
> > vector code. Also, we never hit an interrupt below 0x300 when IR=DR=1
> > implying memory region between 0x4000 to 0x4300 can also be used for
> > common interrupt vector code. So, we can effectively use memory region
> > between 0x1800 to 0x4300 for common interrupt vector code.
>
> On Power9 the system-call-vectored instruction will use the region at 0x3000, so
> moving code into that space is not a good long term plan.
>
> I'll take your v2 and put it in next next week.
I'll add this fixes line, which I think is correct:
Fixes: c1fb6816fb1b ("powerpc: Add relocation on exception vector handlers")
cheers
next prev parent reply other threads:[~2016-04-15 13:00 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-07 21:57 [PATCH v4 1/3] ppc64/book3s: fix branching to out of line handlers in relocation kernel Hari Bathini
2016-04-07 21:58 ` [PATCH v4 2/3] ppc64/book3s: make some room for common interrupt vector code Hari Bathini
2016-04-15 11:06 ` [v4, " Michael Ellerman
2016-04-15 12:59 ` Michael Ellerman [this message]
2016-04-18 3:44 ` Hari Bathini
2016-04-07 22:00 ` [PATCH v4 3/3] ppc64/book3s: remove __end_handlers marker Hari Bathini
2016-04-21 13:39 ` [v4,3/3] " Michael Ellerman
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