From: Ben Collins <bcollins@debian.org>
To: Linux Bigot <linuxopinion@yahoo.com>
Cc: Kurt Ferreira <kferreir@esscom.com>, linux-kernel@vger.kernel.org
Subject: Re: how to get virtual address from dma address
Date: Wed, 3 Oct 2001 18:03:54 -0400 [thread overview]
Message-ID: <20011003180354.I319@visi.net> (raw)
In-Reply-To: <Pine.LNX.4.21.0110031525370.14852-100000@pogo.esscom.com> <20011003214858.97073.qmail@web14807.mail.yahoo.com>
In-Reply-To: <20011003214858.97073.qmail@web14807.mail.yahoo.com>
On Wed, Oct 03, 2001 at 02:48:58PM -0700, Linux Bigot wrote:
> oops! I am sorry. I did not meant "pci_unmap_single"
> pci_unmap_single.
>
> I meant to get a routine which does exactly opposite
> of what pci_map_single does, i.e., give me a virtual
> address for a dma address.
pci_unmap_single is the exact opposite of pci_map_single. It unmaps a
memory region. It just doesn't do what you want.
Bottom line, to keep your driver portable, you are going to have to keep
a mapping of the dma and real addresses either in a structure as most
drivers do, or as a hash like a couple difficult ones do.
Ben
--
.----------=======-=-======-=========-----------=====------------=-=-----.
/ Ben Collins -- Debian GNU/Linux \
` bcollins@debian.org -- bcollins@openldap.org -- bcollins@linux.com '
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next prev parent reply other threads:[~2001-10-03 22:07 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <Pine.LNX.4.21.0110031525370.14852-100000@pogo.esscom.com>
2001-10-03 21:48 ` how to get virtual address from dma address Linux Bigot
2001-10-03 22:03 ` Ben Collins [this message]
2001-10-05 14:04 ` Jes Sorensen
2001-10-03 22:44 James Bottomley
2001-10-04 0:24 ` David S. Miller
2001-10-04 10:11 ` BALBIR SINGH
2001-10-04 11:16 ` David S. Miller
2001-10-04 15:37 ` James Bottomley
2001-10-05 14:06 ` Jes Sorensen
2001-10-06 8:06 ` Paul Mackerras
2001-10-06 8:38 ` David S. Miller
2001-10-06 12:18 ` Paul Mackerras
2001-10-06 14:45 ` James Bottomley
2001-10-06 16:51 ` Gérard Roudier
2001-10-06 17:23 ` Jes Sorensen
2001-10-07 2:13 ` Paul Mackerras
2001-10-07 17:40 ` Jes Sorensen
2001-10-07 7:21 ` Gérard Roudier
2001-10-07 16:23 ` James Bottomley
2001-10-07 18:24 ` Gérard Roudier
2001-10-07 23:02 ` James Bottomley
2001-10-08 21:06 ` Gérard Roudier
[not found] ` <mailman.1002371041.9232.linux-kernel2news@redhat.com>
2001-10-06 18:19 ` Pete Zaitcev
[not found] ` <mailman.1002355920.6872.linux-kernel2news@redhat.com>
2001-10-06 18:04 ` Pete Zaitcev
-- strict thread matches above, loose matches on Subject: below --
2001-10-03 21:30 Manfred Spraul
2001-10-03 16:37 Linux Bigot
2001-10-03 19:32 ` Ben Collins
2001-10-03 21:11 ` Linux Bigot
2001-10-03 21:23 ` Ben Collins
2001-10-03 14:11 Linux Bigot
2001-10-03 15:25 ` Jes Sorensen
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