From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Christoph Hellwig <hch@lst.de>
Cc: Arnd Bergmann <arnd@arndb.de>,
Shamir Rabinovitch <shamir.rabinovitch@oracle.com>,
David Woodhouse <dwmw2@infradead.org>,
Andy Lutomirski <luto@amacapital.net>,
Christian Borntraeger <borntraeger@de.ibm.com>,
linux-arch <linux-arch@vger.kernel.org>,
Paolo Bonzini <pbonzini@redhat.com>,
Martin Schwidefsky <schwidefsky@de.ibm.com>,
"linux-doc@vger.kernel.org" <linux-doc@vger.kernel.org>,
Sebastian Ott <sebott@linux.vnet.ibm.com>,
linux-s390 <linux-s390@vger.kernel.org>,
Cornelia Huck <cornelia.huck@de.ibm.com>,
Joerg Roedel <jroedel@suse.de>, Jonathan Corbet <corbet@lwn.net>,
KVM <kvm@vger.kernel.org>
Subject: Re: [PATCH v1 2/2] dma-mapping-common: add DMA attribute - DMA_ATTR_IOMMU_BYPASS
Date: Wed, 04 Nov 2015 06:35:10 +1100 [thread overview]
Message-ID: <1446579310.17404.36.camel@kernel.crashing.org> (raw)
In-Reply-To: <20151103131134.GA6384@lst.de>
On Tue, 2015-11-03 at 14:11 +0100, Christoph Hellwig wrote:
> > xHCI for example, vs. something like 10G ethernet... but yes I agree it
> > sucks. I don't like that sort of policy anywhere in drivers. On the
> > other hand the platform doesn't have much information to make that sort
> > of decision either.
>
> Mabye because it should simply use what's optimal? E.g. passthrough
> whenever possible, where arguments against possible are: dma_mask, vfio
> requirements, kernel command line option.
Right this is what I do today on powerpc with the exception of
the command line option.
> This is what a lot of
> architectures already do, I remember the SGI Origin / Altix code has the
> same behavior as well. Those IOMMUs already had the 64 bit passthrough
> and 32-bit sliding window in addition to the real IOMMU 10 years ago.
> --
next prev parent reply other threads:[~2015-11-03 19:35 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-25 16:07 [PATCH v1 1/2] dma-mapping-common: add dma_map_page_attrs API Shamir Rabinovitch
2015-10-25 16:07 ` [PATCH v1 2/2] dma-mapping-common: add DMA attribute - DMA_ATTR_IOMMU_BYPASS Shamir Rabinovitch
2015-10-28 6:30 ` David Woodhouse
2015-10-28 11:10 ` Shamir Rabinovitch
2015-10-28 13:31 ` David Woodhouse
2015-10-28 14:07 ` David Miller
2015-10-28 13:57 ` David Woodhouse
2015-10-29 0:23 ` David Miller
2015-10-29 0:32 ` Benjamin Herrenschmidt
2015-10-29 0:42 ` David Woodhouse
2015-10-29 1:10 ` Benjamin Herrenschmidt
2015-10-29 18:31 ` Andy Lutomirski
2015-10-29 22:35 ` David Woodhouse
2015-11-01 7:45 ` Shamir Rabinovitch
2015-11-01 21:10 ` Benjamin Herrenschmidt
2015-11-02 7:23 ` Shamir Rabinovitch
2015-11-02 10:00 ` Benjamin Herrenschmidt
2015-11-02 12:07 ` Shamir Rabinovitch
2015-11-02 20:13 ` Benjamin Herrenschmidt
2015-11-02 21:45 ` Arnd Bergmann
2015-11-02 23:08 ` Benjamin Herrenschmidt
2015-11-03 13:11 ` Christoph Hellwig
2015-11-03 19:35 ` Benjamin Herrenschmidt [this message]
2015-11-02 21:49 ` Shamir Rabinovitch
2015-11-02 22:48 ` David Woodhouse
2015-11-02 23:10 ` Benjamin Herrenschmidt
2015-11-05 21:08 ` David Miller
2015-10-30 1:51 ` Benjamin Herrenschmidt
2015-10-30 10:32 ` Arnd Bergmann
2015-10-30 23:17 ` Benjamin Herrenschmidt
2015-10-30 23:24 ` Arnd Bergmann
2015-11-02 14:51 ` Joerg Roedel
2015-10-29 7:32 ` Shamir Rabinovitch
2015-11-02 14:44 ` Joerg Roedel
2015-11-02 17:32 ` Shamir Rabinovitch
2015-11-05 13:42 ` Joerg Roedel
2015-11-05 21:11 ` David Miller
2015-11-07 15:06 ` Shamir Rabinovitch
[not found] ` <CAN+hb0UvztgwNuAh93XdJEe7vgiZgNMc9mHNziHpEopg8Oi4Mg@mail.gmail.com>
2015-11-16 8:42 ` David Woodhouse
[not found] ` <CAN+hb0UWpfcS5DvgMxNjY-5JOztw2mO1r2FJAW17fn974mhxPA@mail.gmail.com>
2015-11-16 18:42 ` Benjamin Serebrin
-- strict thread matches above, loose matches on Subject: below --
2015-10-25 16:37 [PATCH v1 1/2] dma-mapping-common: add dma_map_page_attrs API Shamir Rabinovitch
2015-10-25 16:37 ` [PATCH v1 2/2] dma-mapping-common: add DMA attribute - DMA_ATTR_IOMMU_BYPASS Shamir Rabinovitch
2015-11-16 6:56 Benjamin Serebrin
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