From owner-freebsd-net@FreeBSD.ORG Tue Jul 31 17:41:05 2012 Return-Path: Delivered-To: freebsd-net@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 7DFED106566C for ; Tue, 31 Jul 2012 17:41:05 +0000 (UTC) (envelope-from kostikbel@gmail.com) Received: from mail.zoral.com.ua (mx0.zoral.com.ua [91.193.166.200]) by mx1.freebsd.org (Postfix) with ESMTP id D2E5A8FC08 for ; Tue, 31 Jul 2012 17:41:04 +0000 (UTC) Received: from skuns.kiev.zoral.com.ua (localhost [127.0.0.1]) by mail.zoral.com.ua (8.14.2/8.14.2) with ESMTP id q6VHfDZx074629; Tue, 31 Jul 2012 20:41:13 +0300 (EEST) (envelope-from kostikbel@gmail.com) Received: from deviant.kiev.zoral.com.ua (kostik@localhost [127.0.0.1]) by deviant.kiev.zoral.com.ua (8.14.5/8.14.5) with ESMTP id q6VHf1Zd056624; Tue, 31 Jul 2012 20:41:01 +0300 (EEST) (envelope-from kostikbel@gmail.com) Received: (from kostik@localhost) by deviant.kiev.zoral.com.ua (8.14.5/8.14.5/Submit) id q6VHf1dj056623; Tue, 31 Jul 2012 20:41:01 +0300 (EEST) (envelope-from kostikbel@gmail.com) X-Authentication-Warning: deviant.kiev.zoral.com.ua: kostik set sender to kostikbel@gmail.com using -f Date: Tue, 31 Jul 2012 20:41:01 +0300 From: Konstantin Belousov To: Artem Belevich Message-ID: <20120731174101.GE2676@deviant.kiev.zoral.com.ua> References: Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="Lf5N93S3uGY/b6lN" Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.4.2.3i X-Virus-Scanned: clamav-milter 0.95.2 at skuns.kiev.zoral.com.ua X-Virus-Status: Clean X-Spam-Status: No, score=-4.0 required=5.0 tests=ALL_TRUSTED,AWL,BAYES_00 autolearn=ham version=3.2.5 X-Spam-Checker-Version: SpamAssassin 3.2.5 (2008-06-10) on skuns.kiev.zoral.com.ua Cc: freebsd-net@freebsd.org, Venkat Duvvuru Subject: Re: PCI BAR mmap X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 31 Jul 2012 17:41:05 -0000 --Lf5N93S3uGY/b6lN Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, Jul 31, 2012 at 10:15:22AM -0700, Artem Belevich wrote: > On Tue, Jul 31, 2012 at 5:48 AM, Venkat Duvvuru > wrote: > > Hi, > > How to mmap PCI BARs from userland in freebsd? > > In Linux the PCI BAR appears as a file in the sysfs file system. How ca= n I > > access PCI BAR as a file in freebsd to mmap it? >=20 > It's a bit of a hack, but if you are root, you can access physical > memory via /dev/mem. >=20 > memfd =3D open(/dev/mem) > ptr =3D mmap(NULL, bar_size, PROT_READ, 0, memfd, bar_address); >=20 > You can even use dd: >=20 > dd if=3D/dev/mem bs=3D4k skip=3D count=3D of= =3Dbar.dump This probably only works on x86, only for memory BARs, and only if BAR is already activated. But yes, I did grabbed scanouts (i.e. screen) on Intel GPUs this way. --Lf5N93S3uGY/b6lN Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (FreeBSD) iEYEARECAAYFAlAYGK0ACgkQC3+MBN1Mb4iH9ACgoTJJhSV/GWg6sFqtIoSNlWU8 7MYAoJ0M0yK2K2how1jdmkO8O16lqfbH =LpXT -----END PGP SIGNATURE----- --Lf5N93S3uGY/b6lN--