From: Andi Kleen <andi@firstfloor.org>
To: Daniel Haid <d.haid@gogi.tv>
Cc: linux-kernel@vger.kernel.org,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
Andi Kleen <andi@firstfloor.org>,
airlied@linux.ie, alexdeucher@gmail.com
Subject: Re: Question about iommu on x86_64 and radeon driver.
Date: Thu, 2 Jun 2011 00:22:26 +0200 [thread overview]
Message-ID: <20110601222226.GH27166@one.firstfloor.org> (raw)
In-Reply-To: <34fa3fe7780241e452b268fd5ecfdee9@admin.gogi.tv>
On Wed, Jun 01, 2011 at 10:58:08PM +0100, Daniel Haid wrote:
> I have also found out the following. In
>
> line 741 of drivers/gpu/drm/radeon/radeon_device.c
>
> there is a comment "PCIE - can handle 40-bits." -
> I have a PCIE card - and then need_dma32 is not set.
>
> So if I read it correctly the ttm allocation
> routines will allocate memory over 4GB.
>
> But if PCIE can handle 40 bits, why does swiotlb
> give out a bounce buffer to the radeon driver at all?
swiotlb only does what the driver tells it
Also new drivers default to 4GB, so if a driver wants
something else it has to set it explicitely.
Also BTW the driver should work in any case, so likely
something else is wrong.
Really you need to discuss this with the radeon driver people.
Readded cc.
-Andi
--
ak@linux.intel.com -- Speaking for myself only.
next prev parent reply other threads:[~2011-06-01 22:22 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-22 21:56 Daniel Haid
2011-05-23 22:05 ` Konrad Rzeszutek Wilk
2011-05-23 23:45 ` Daniel Haid
2011-05-24 15:50 ` Konrad Rzeszutek Wilk
2011-05-24 21:33 ` Daniel Haid
2011-05-25 12:58 ` Konrad Rzeszutek Wilk
2011-05-25 14:28 ` Daniel Haid
2011-05-24 22:48 ` Andi Kleen
2011-05-25 10:00 ` Daniel Haid
2011-05-25 12:57 ` Konrad Rzeszutek Wilk
2011-05-25 14:51 ` Daniel Haid
2011-05-25 20:21 ` Daniel Haid
2011-05-25 23:05 ` Andi Kleen
2011-05-27 15:48 ` Daniel Haid
2011-05-27 15:55 ` Konrad Rzeszutek Wilk
2011-05-27 22:20 ` Daniel Haid
2011-05-31 13:45 ` Konrad Rzeszutek Wilk
2011-05-31 15:34 ` Daniel Haid
2011-05-31 16:02 ` Konrad Rzeszutek Wilk
[not found] ` <0a8cb4bcad7fcf091a6bbe158323bba0@admin.gogi.tv>
2011-05-31 16:20 ` Daniel Haid
[not found] ` <20110531190412.GA21245@dumpdata.com>
2011-05-31 19:57 ` Daniel Haid
2011-06-01 13:24 ` Konrad Rzeszutek Wilk
2011-06-01 16:10 ` Daniel Haid
2011-06-01 21:51 ` Andi Kleen
2011-06-01 21:58 ` Daniel Haid
2011-06-01 22:22 ` Andi Kleen [this message]
2011-06-03 17:31 ` [PATCH] tentative fix for radeon on systems >4GB without hardware iommu Daniel Haid
2011-06-03 20:44 ` Alex Deucher
2011-06-03 23:13 ` Konrad Rzeszutek Wilk
2011-06-06 17:45 ` Daniel Haid
2011-06-06 17:41 ` Daniel Haid
2011-06-06 19:08 ` Alex Deucher
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20110601222226.GH27166@one.firstfloor.org \
--to=andi@firstfloor.org \
--cc=airlied@linux.ie \
--cc=alexdeucher@gmail.com \
--cc=d.haid@gogi.tv \
--cc=konrad.wilk@oracle.com \
--cc=linux-kernel@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
Powered by JetHome