From: Jon Smirl <jonsmirl@gmail.com>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: "Ville Syrjälä" <syrjala@sci.fi>,
"Jon Smirl" <jonsmirl@yahoo.com>,
dri-devel@lists.sourceforge.net,
"Linux Fbdev development list"
<linux-fbdev-devel@lists.sourceforge.net>,
xorg@lists.freedesktop.org
Subject: Re: radeon, apertures & memory mapping
Date: Sun, 13 Mar 2005 19:25:15 -0500 [thread overview]
Message-ID: <9e47339105031316254524f72@mail.gmail.com> (raw)
In-Reply-To: <1110757699.5787.196.camel@gaston>
On Mon, 14 Mar 2005 10:48:19 +1100, Benjamin Herrenschmidt
<benh@kernel.crashing.org> wrote:
>
> > > That shouldn't matter the page brought in would be for a speculative
> > > read and never accessed. It should just fall out of the cache and not
> > > be written back. There is only one cachable mapping. In this model
> > > writes are always followed by a flush before telling the GPU to access
> > > the memory that has just been written.
> >
> > What about this scenario?
> >
> > Speculative read -> AGP master writes new data -> CPU has invalid data in
> > cache :(
>
You need to reverse the cache flush process if you are going to read
data written by the GPU.
1) Make sure GPU is finished writing
2) flush your cache
3) read AGP memory like normal RAM.
--
Jon Smirl
jonsmirl@gmail.com
-------------------------------------------------------
SF email is sponsored by - The IT Product Guide
Read honest & candid reviews on hundreds of IT Products from real users.
Discover which products truly live up to the hype. Start reading now.
http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click
--
next prev parent reply other threads:[~2005-03-14 0:25 UTC|newest]
Thread overview: 106+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-03-13 1:35 radeon, apertures & memory mapping Benjamin Herrenschmidt
2005-03-13 3:22 ` Jon Smirl
2005-03-13 6:43 ` Benjamin Herrenschmidt
2005-03-13 16:22 ` Jon Smirl
2005-03-14 4:28 ` [Linux-fbdev-devel] " Michel Dänzer
2005-03-14 7:12 ` Benjamin Herrenschmidt
2005-03-14 16:20 ` Michel Dänzer
2005-03-14 21:52 ` Benjamin Herrenschmidt
2005-03-14 22:12 ` Michel Dänzer
2005-03-14 22:37 ` FB model basic issues (WAS: radeon, apertures & memory mapping) Benjamin Herrenschmidt
2005-03-15 4:59 ` Michel Dänzer
2005-03-15 5:14 ` Jon Smirl
2005-03-15 6:01 ` Ville Syrjälä
2005-03-15 6:59 ` Benjamin Herrenschmidt
2005-03-15 14:00 ` Ville Syrjälä
2005-03-15 14:29 ` Jon Smirl
2005-03-15 17:25 ` Jan Gukelberger
2005-03-15 23:34 ` Benjamin Herrenschmidt
2005-03-15 8:51 ` Geert Uytterhoeven
2005-03-15 13:36 ` [Linux-fbdev-devel] " Ville Syrjälä
2005-03-15 23:33 ` Benjamin Herrenschmidt
2005-03-15 23:37 ` Antonino A. Daplas
2005-03-15 23:50 ` [Linux-fbdev-devel] " Benjamin Herrenschmidt
2005-03-16 1:47 ` Ville Syrjälä
2005-03-16 1:51 ` Benjamin Herrenschmidt
2005-03-16 19:51 ` Ville Syrjälä
2005-03-16 21:00 ` Michel Dänzer
2005-03-16 21:07 ` Ville Syrjälä
2005-03-16 23:28 ` Benjamin Herrenschmidt
2005-03-16 23:53 ` Michel Dänzer
2005-03-16 23:25 ` [Linux-fbdev-devel] " Benjamin Herrenschmidt
[not found] ` <1110929582.25201.34.camel@gaston>
2005-03-16 5:21 ` Michel Dänzer
2005-03-16 6:31 ` Benjamin Herrenschmidt
2005-03-16 14:09 ` Ville Syrjälä
2005-03-16 16:48 ` Adam Jackson
2005-03-16 23:20 ` Benjamin Herrenschmidt
2005-03-15 11:30 ` Roland Scheidegger
2005-03-15 13:27 ` Ville Syrjälä
2005-03-15 17:17 ` Michel Dänzer
2005-03-16 3:09 ` Benjamin Herrenschmidt
2005-03-16 20:08 ` Ville Syrjälä
2005-03-16 20:42 ` [Linux-fbdev-devel] " Michel Dänzer
2005-03-16 23:26 ` Benjamin Herrenschmidt
2005-03-16 23:35 ` Jon Smirl
2005-03-17 0:06 ` [Linux-fbdev-devel] " Benjamin Herrenschmidt
2005-03-16 20:58 ` Alex Deucher
2005-03-16 21:08 ` Ville Syrjälä
2005-03-16 21:17 ` Alex Deucher
2005-03-16 23:30 ` Benjamin Herrenschmidt
2005-03-17 0:47 ` Ville Syrjälä
2005-03-17 1:12 ` Benjamin Herrenschmidt
2005-03-17 1:25 ` Ville Syrjälä
2005-03-17 2:00 ` Benjamin Herrenschmidt
2005-03-17 9:08 ` Geert Uytterhoeven
2005-03-17 19:54 ` [Linux-fbdev-devel] " Ville Syrjälä
2005-03-15 22:44 ` Benjamin Herrenschmidt
2005-03-15 23:05 ` Ville Syrjälä
2005-03-15 23:49 ` Benjamin Herrenschmidt
2005-03-16 20:55 ` Ville Syrjälä
2005-03-16 23:27 ` Benjamin Herrenschmidt
2005-03-17 0:14 ` Ville Syrjälä
2005-03-17 0:28 ` Benjamin Herrenschmidt
2005-03-15 6:45 ` Benjamin Herrenschmidt
2005-03-15 5:30 ` Jon Smirl
2005-03-15 6:58 ` Benjamin Herrenschmidt
2005-03-15 21:58 ` Ian Romanick
2005-03-13 3:55 ` radeon, apertures & memory mapping Vladimir Dergachev
2005-03-13 6:44 ` Benjamin Herrenschmidt
2005-03-13 8:22 ` Ville Syrjälä
2005-03-13 9:20 ` Benjamin Herrenschmidt
2005-03-13 10:39 ` Ville Syrjälä
2005-03-13 12:04 ` Benjamin Herrenschmidt
2005-03-13 16:19 ` Jon Smirl
2005-03-13 17:47 ` Ville Syrjälä
2005-03-13 17:56 ` [Linux-fbdev-devel] " Jon Smirl
2005-03-13 21:52 ` Benjamin Herrenschmidt
2005-03-13 22:17 ` Jon Smirl
2005-03-13 22:41 ` Benjamin Herrenschmidt
2005-03-13 21:51 ` Benjamin Herrenschmidt
2005-03-13 21:49 ` Benjamin Herrenschmidt
2005-03-13 22:10 ` Jon Smirl
2005-03-13 22:20 ` Benjamin Herrenschmidt
2005-03-13 23:00 ` Jon Smirl
2005-03-13 23:11 ` Benjamin Herrenschmidt
2005-03-13 23:27 ` Ville Syrjälä
2005-03-13 23:48 ` Benjamin Herrenschmidt
2005-03-14 0:08 ` Ville Syrjälä
2005-03-14 0:10 ` Benjamin Herrenschmidt
2005-03-14 0:25 ` Jon Smirl [this message]
2005-03-14 0:39 ` Ville Syrjälä
2005-03-14 1:02 ` Benjamin Herrenschmidt
2005-03-14 0:54 ` Benjamin Herrenschmidt
2005-03-14 0:41 ` Paul Mackerras
2005-03-14 0:56 ` Ville Syrjälä
2005-03-14 1:05 ` [Linux-fbdev-devel] " Benjamin Herrenschmidt
2005-03-14 1:47 ` Jon Smirl
2005-03-14 3:59 ` Benjamin Herrenschmidt
2005-03-14 4:07 ` Paul Mackerras
2005-03-14 4:40 ` Jon Smirl
2005-03-14 5:09 ` [Linux-fbdev-devel] " Benjamin Herrenschmidt
2005-03-14 16:30 ` Soeren Sandmann
2005-03-14 16:40 ` Ville Syrjälä
2005-03-14 21:54 ` Benjamin Herrenschmidt
2005-03-14 16:16 ` Ville Syrjälä
2005-03-14 21:27 ` Donnie Berkholz
2005-03-14 21:51 ` Benjamin Herrenschmidt
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=9e47339105031316254524f72@mail.gmail.com \
--to=jonsmirl@gmail.com \
--cc=benh@kernel.crashing.org \
--cc=dri-devel@lists.sourceforge.net \
--cc=jonsmirl@yahoo.com \
--cc=linux-fbdev-devel@lists.sourceforge.net \
--cc=syrjala@sci.fi \
--cc=xorg@lists.freedesktop.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;
as well as URLs for NNTP newsgroup(s).