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> Date: Fri, 8 Feb 2008 16:16:34 -0800> From: clameter@sgi.com> To: rdreier@cisco.com> CC: akpm@linux-foundation.org; andrea@qumranet.com; a.p.zijlstra@chello.nl; linux-mm@kvack.org; izike@qumranet.com; steiner@sgi.com; linux-kernel@vger.kernel.org; avi@qumranet.com; kvm-devel@lists.sourceforge.net; daniel.blueman@quadrics.com; holt@sgi.com; general@lists.openfabrics.org> Subject: Re: [ofa-general] Re: [patch 0/6] MMU Notifiers V6> > On Fri, 8 Feb 2008, Roland Dreier wrote:> > > In general, this MMU notifier stuff will only be useful to a subset of> > InfiniBand/RDMA hardware. Some adapters are smart enough to handle> > changing the IO virtual -> bus/physical mapping on the fly, but some> > aren't. For the dumb adapters, I think the current ib_umem_get() is> > pretty close to as good as we can get: we have to keep the physical> > pages pinned for as long as the adapter is allowed to DMA into the> > memory region.> > I thought the adaptor can always remove the mapping by renegotiating > with the remote side? Even if its dumb then a callback could notify the > driver that it may be required to tear down the mapping. We then hold the > pages until we get okay by the driver that the mapping has been removed.> > We could also let the unmapping fail if the driver indicates that the > mapping must stay.> --> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in> the body of a message to majordomo@vger.kernel.org> More majordomo info at http://vger.kernel.org/majordomo-info.html> Please read the FAQ at http://www.tux.org/lkml/
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