From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Kumar Gala <galak@kernel.crashing.org>
Cc: linuxppc-dev@ozlabs.org
Subject: Re: [PATCH] powerpc: Add support for using doorbells for SMP IPI
Date: Fri, 13 Feb 2009 13:46:40 +1100 [thread overview]
Message-ID: <1234493200.29851.79.camel@pasglop> (raw)
In-Reply-To: <1234482893-17712-1-git-send-email-galak@kernel.crashing.org>
On Thu, 2009-02-12 at 17:54 -0600, Kumar Gala wrote:
> The e500mc supports the new msgsnd/doorbell mechanisms that were added in
> the Power ISA 2.05 architecture. We use the normal level doorbell for
> doing SMP IPIs at this point.
>
Cool stuff. Haven't reviewed in details yet tho :-) But I was
thinking...
We should introduce a special xmon variant of local_irq_save/restore for
use by xmon that masks MSR:CE and use a crit doorbell for xmon IPI, that
would increase significantly the ability of xmon to catch deadlocked
CPUs, and we could use external CRITs as a more generic way of doing
IPIs, no ?
In fact, we should expose a local_crit_irq_save/restore (disable/enable)
too for things like watchdog drivers etc... which may want to use these.
Cheers,
Ben.
next prev parent reply other threads:[~2009-02-13 2:46 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-02-12 23:54 [PATCH] powerpc: Add support for using doorbells for SMP IPI Kumar Gala
2009-02-13 2:46 ` Benjamin Herrenschmidt [this message]
2009-02-13 5:10 ` Kumar Gala
2009-02-13 5:25 ` Benjamin Herrenschmidt
2009-02-23 2:43 ` Benjamin Herrenschmidt
2009-02-23 16:23 ` Kumar Gala
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