From: David Miller <davem@davemloft.net>
To: ralphc@pathscale.com
Cc: rolandd@cisco.com, openib-general@openib.org,
linux-kernel@vger.kernel.org
Subject: Re: Suggestions for how to remove bus_to_virt()
Date: Wed, 12 Jul 2006 16:40:48 -0700 (PDT) [thread overview]
Message-ID: <20060712.164048.51855175.davem@davemloft.net> (raw)
In-Reply-To: <1152746967.4572.263.camel@brick.pathscale.com>
From: Ralph Campbell <ralphc@pathscale.com>
Date: Wed, 12 Jul 2006 16:29:27 -0700
> Currently, the ib_ipath driver requires that the mapping be
> one-to-one since there is no practical way to reverse IOMMU
> mappings.
You can maintain a hash table that maps DMA addresses back to kernel
mappings. Depending upon your situation, you can optimize this to use
very small keys if you have some kind of other identification method
for your buffers.
That would be for dynamic mappings.
You were using consistent DMA memory, which I gather you're not,
you could use the PCI DMA pool mechanism.
next prev parent reply other threads:[~2006-07-12 23:40 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-07-12 23:29 Ralph Campbell
2006-07-12 23:40 ` David Miller [this message]
2006-07-13 0:11 ` Roland Dreier
2006-07-13 0:40 ` David Miller
2006-07-13 5:46 ` [openib-general] " Muli Ben-Yehuda
2006-07-14 22:27 ` Ralph Campbell
2006-07-14 22:35 ` David Miller
2006-07-14 23:45 ` Ralph Campbell
2006-07-15 13:42 ` Stefan Richter
2006-07-13 7:45 ` Stefan Richter
2006-07-13 16:02 ` Roland Dreier
2006-07-13 16:37 ` Ralph Campbell
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=20060712.164048.51855175.davem@davemloft.net \
--to=davem@davemloft.net \
--cc=linux-kernel@vger.kernel.org \
--cc=openib-general@openib.org \
--cc=ralphc@pathscale.com \
--cc=rolandd@cisco.com \
/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
all inboxes | Powered by JetHome®