From: Arnd Bergmann <arnd@arndb.de>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: 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>, Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH v1 2/2] dma-mapping-common: add DMA attribute - DMA_ATTR_IOMMU_BYPASS
Date: Mon, 02 Nov 2015 22:45:54 +0100 [thread overview]
Message-ID: <5270615.Sf6ng964Qt@wuerfel> (raw)
In-Reply-To: <1446495208.17404.11.camel@kernel.crashing.org>
On Tuesday 03 November 2015 07:13:28 Benjamin Herrenschmidt wrote:
> On Mon, 2015-11-02 at 14:07 +0200, Shamir Rabinovitch wrote:
> > On Mon, Nov 02, 2015 at 09:00:34PM +1100, Benjamin Herrenschmidt
> > wrote:
> > >
> > > Chosing on a per-mapping basis *in the back end* might still make
> > > some
> >
> > In my case, choosing mapping based on the hardware that will use this
> > mappings makes more sense. Most hardware are not that performance
> > sensitive as the Infiniband hardware.
>
> ...
>
> > The driver know for what hardware it is mapping the memory so it know
> > if the memory will be used by performance sensitive hardware or not.
>
> Then I would argue for naming this differently. Make it an optional
> hint "DMA_ATTR_HIGH_PERF" or something like that. Whether this is
> achieved via using a bypass or other means in the backend not the
> business of the driver.
>
With a name like that, who wouldn't pass that flag? ;-)
Arnd
next prev parent reply other threads:[~2015-11-02 21:45 UTC|newest]
Thread overview: 65+ 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 11:10 ` Shamir Rabinovitch
2015-10-28 13:31 ` David Woodhouse
2015-10-28 13:31 ` David Woodhouse
2015-10-28 14:07 ` David Miller
2015-10-28 13:57 ` David Woodhouse
2015-10-28 13:57 ` David Woodhouse
2015-10-29 0:23 ` David Miller
2015-10-29 0:23 ` David Miller
2015-10-28 14:07 ` David Miller
2015-10-29 0:32 ` Benjamin Herrenschmidt
2015-10-29 0:32 ` Benjamin Herrenschmidt
2015-10-29 0:42 ` David Woodhouse
2015-10-29 0:42 ` David Woodhouse
2015-10-29 1:10 ` Benjamin Herrenschmidt
2015-10-29 1:10 ` Benjamin Herrenschmidt
2015-10-29 18:31 ` Andy Lutomirski
2015-10-29 18:31 ` Andy Lutomirski
2015-10-29 22:35 ` David Woodhouse
2015-11-01 7:45 ` Shamir Rabinovitch
2015-11-01 7:45 ` Shamir Rabinovitch
2015-11-01 21:10 ` Benjamin Herrenschmidt
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 [this message]
2015-11-02 21:45 ` Arnd Bergmann
2015-11-02 23:08 ` Benjamin Herrenschmidt
2015-11-02 23:08 ` Benjamin Herrenschmidt
2015-11-03 13:11 ` Christoph Hellwig
2015-11-03 13:11 ` Christoph Hellwig
2015-11-03 19:35 ` Benjamin Herrenschmidt
2015-11-03 19:35 ` Benjamin Herrenschmidt
2015-11-02 21:49 ` Shamir Rabinovitch
2015-11-02 22:48 ` David Woodhouse
2015-11-02 23:10 ` Benjamin Herrenschmidt
2015-11-02 23:10 ` Benjamin Herrenschmidt
2015-11-05 21:08 ` David Miller
2015-11-05 21:08 ` David Miller
2015-10-30 1:51 ` Benjamin Herrenschmidt
2015-10-30 1:51 ` Benjamin Herrenschmidt
2015-10-30 10:32 ` Arnd Bergmann
2015-10-30 10:32 ` Arnd Bergmann
2015-10-30 23:17 ` Benjamin Herrenschmidt
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
2015-11-02 17:32 ` Shamir Rabinovitch
2015-11-05 13:42 ` Joerg Roedel
2015-11-05 21:11 ` David Miller
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
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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