From: Zhenyu Wang <zhenyuw@linux.intel.com>
To: Takashi Iwai <tiwai@suse.de>
Cc: Eric Anholt <eric@anholt.net>, David Airlie <airlied@linux.ie>,
dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] agp/intel: Fix dma mask for Sandybridge
Date: Mon, 23 Aug 2010 14:19:22 +0800 [thread overview]
Message-ID: <20100823061922.GD29442@zhen-devel.sh.intel.com> (raw)
In-Reply-To: <s5hzkwddfy5.wl%tiwai@suse.de>
[-- Attachment #1: Type: text/plain, Size: 678 bytes --]
On 2010.08.23 08:02:42 +0200, Takashi Iwai wrote:
>
> Also, I don't understand the logic of 40bit addr calculation:
>
> > static unsigned long intel_gen6_mask_memory(struct agp_bridge_data *bridge,
> > dma_addr_t addr, int type)
> > {
> > /* Shift high bits down */
> > addr |= (addr >> 28) & 0xff;
>
> Isn't it 0xff0?
>
No. This depends on hw 32bit PTE format for sandybridge.
bit 31 bit 11 bit 4 bit 0
|<-physical addr 31:12->|<-physical addr 39:32->|<-cache ctl 3:1->|valid|
--
Open Source Technology Center, Intel ltd.
$gpg --keyserver wwwkeys.pgp.net --recv-keys 4D781827
[-- Attachment #2: Digital signature --]
[-- Type: application/pgp-signature, Size: 198 bytes --]
next prev parent reply other threads:[~2010-08-23 6:19 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-20 15:36 [PATCH] agp/intel: Fix dma mask for Sandybridge Takashi Iwai
2010-08-23 1:35 ` Zhenyu Wang
2010-08-23 5:29 ` Takashi Iwai
2010-08-23 5:43 ` Zhenyu Wang
2010-08-23 6:02 ` Takashi Iwai
2010-08-23 6:13 ` Takashi Iwai
2010-08-23 6:19 ` Zhenyu Wang [this message]
2010-08-23 6:31 ` Takashi Iwai
2010-08-23 6:48 ` Zhenyu Wang
2010-08-23 14:02 ` Eric Anholt
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=20100823061922.GD29442@zhen-devel.sh.intel.com \
--to=zhenyuw@linux.intel.com \
--cc=airlied@linux.ie \
--cc=dri-devel@lists.freedesktop.org \
--cc=eric@anholt.net \
--cc=linux-kernel@vger.kernel.org \
--cc=tiwai@suse.de \
/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