From: Joachim Fenkes <fenkes@de.ibm.com>
To: Roland Dreier <rdreier@cisco.com>
Cc: Arnd Bergmann <arnd@arndb.de>,
linuxppc-dev@ozlabs.org, LKML <linux-kernel@vger.kernel.org>,
OF-EWG <ewg@lists.openfabrics.org>,
Christoph Raisch <raisch@de.ibm.com>,
Marcus Eder <meder@de.ibm.com>,
OF-General <general@lists.openfabrics.org>,
Stefan Roscher <stefan.roscher@de.ibm.com>
Subject: Re: [PATCH] IB/ehca: Serialize HCA-related hCalls on POWER5
Date: Mon, 10 Dec 2007 18:41:29 +0100 [thread overview]
Message-ID: <200712101841.30010.fenkes@de.ibm.com> (raw)
In-Reply-To: <adaodcza1xc.fsf@cisco.com>
On Monday 10 December 2007 00:22, Roland Dreier wrote:
> Fair enough... according to Documentation/infiniband/core_locking.txt,
> the only driver methods that cannot sleep are:
>
> [...]
> map_phys_fmr
In fact, we do use hCalls there. Our hardware doesn't actually support FMRs,
so we translate a "map FMR" into a "reallocate PMR", which doesn't work
without hCalls. What's more, the hCalls involved (e.g. H_FREE_RESOURCE)
might well return H_LONG_BUSY, so the whole operation might sleep; no way
around it.
How should we deal with this?
Thanks,
Joachim
next prev parent reply other threads:[~2007-12-10 17:42 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-12-06 15:07 [PATCH] IB/ehca: Serialize HCA-related hCalls on POWER5 Joachim Fenkes
2007-12-06 15:48 ` Arnd Bergmann
2007-12-06 18:27 ` Roland Dreier
2007-12-07 9:58 ` Arnd Bergmann
2007-12-09 23:22 ` Roland Dreier
2007-12-10 17:41 ` Joachim Fenkes [this message]
2007-12-10 21:47 ` Roland Dreier
2007-12-11 8:38 ` Joachim Fenkes
2007-12-12 12:14 ` [ewg] " Or Gerlitz
2007-12-12 16:02 ` Christoph Raisch
2007-12-12 19:09 ` Roland Dreier
2007-12-13 8:30 ` Or Gerlitz
2007-12-13 19:22 ` [ofa-general] " Caitlin Bestler
2007-12-13 20:59 ` Joachim Fenkes
2007-12-13 21:08 ` Caitlin Bestler
2007-12-13 21:35 ` Joachim Fenkes
2007-12-13 21:48 ` [ofa-general] Re: [ewg] Re: [PATCH] IB/ehca: SerializeHCA-related " Sean Hefty
2007-12-07 16:25 ` [PATCH] IB/ehca: Serialize HCA-related " Joachim Fenkes
[not found] <OF85E31FAA.DADA6039-ONC12573AA.005439C8-C12573AA.005A132E@LocalDomain>
2007-12-10 17:59 ` Joachim Fenkes
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