Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755526AbXJYJAk (ORCPT ); Thu, 25 Oct 2007 05:00:40 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750736AbXJYJAc (ORCPT ); Thu, 25 Oct 2007 05:00:32 -0400 Received: from mail.sf-mail.de ([62.27.20.61]:33808 "EHLO mail.sf-mail.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750710AbXJYJAb (ORCPT ); Thu, 25 Oct 2007 05:00:31 -0400 From: Rolf Eike Beer To: Jens Axboe Subject: Re: [PATCH 2.6.24-rc1] fix sg_phys to use dma_addr_t Date: Thu, 25 Oct 2007 11:00:24 +0200 User-Agent: KMail/1.9.6 (enterprise 20070904.708012) Cc: Arjan van de Ven , Hugh Dickins , linux-kernel@vger.kernel.org References: <200710251051.30429.eike-kernel@sf-tec.de> <20071025085239.GH5053@kernel.dk> In-Reply-To: <20071025085239.GH5053@kernel.dk> MIME-Version: 1.0 Content-Type: multipart/signed; boundary="nextPart1453408.zUZeNn3pBO"; protocol="application/pgp-signature"; micalg=pgp-sha1 Content-Transfer-Encoding: 7bit Message-Id: <200710251100.29739.eike-kernel@sf-tec.de> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1975 Lines: 56 --nextPart1453408.zUZeNn3pBO Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Content-Disposition: inline Jens Axboe wrote: > On Thu, Oct 25 2007, Rolf Eike Beer wrote: > > Am Donnerstag, 25. Oktober 2007 schrieb Arjan van de Ven: > > > > Signed-off-by: Hugh Dickins > > > > --- > > > > Whether this is a complete patch, suitable for all architectures, > > > > I'm not sure: it builds, boots and runs correctly on the x86_32 box > > > > in question, but you'll be a lot wiser than me about using dma_addr= _t > > > > for everyone. (Seems a bit of a shame to include her= e, > > > > when I think all arches already get to include it one way or anothe= r, > > > > typically via asm/scatterlist.h; but I guess it's safest to repeat > > > > it.) > > > > > > there is a problem with this... sg_phys doesn't return an actual *dma* > > > address.... at least not an address you can give to the device. > > > Using dma_addr_t is thus a bit misleading..... > > > > Ok, then: how do I actually get such an address? > > You use the dma mapping api, Documentation/DMA-mapping.txt Which comes back always to the same point: if I get a buffer from userspace= to=20 use for DMA: what can I do then? I need to convert a given list of (physica= l,=20 pinned) pages to DMA addresses. Eike --nextPart1453408.zUZeNn3pBO Content-Type: application/pgp-signature; name=signature.asc Content-Description: This is a digitally signed message part. -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.4-svn0 (GNU/Linux) iD8DBQBHIFstXKSJPmm5/E4RAstQAJkBdgZZ8K1eAdVU3opus1qdM03eIACgnVog zIQvqhjCikXcFYSqf1XeYCo= =yI/o -----END PGP SIGNATURE----- --nextPart1453408.zUZeNn3pBO-- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/