From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758088AbZBWUEj (ORCPT ); Mon, 23 Feb 2009 15:04:39 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757455AbZBWUC3 (ORCPT ); Mon, 23 Feb 2009 15:02:29 -0500 Received: from 69-30-77-85.dq1sn.easystreet.com ([69.30.77.85]:53416 "EHLO kingsolver.anholt.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757448AbZBWUC2 (ORCPT ); Mon, 23 Feb 2009 15:02:28 -0500 Subject: Re: [Linux 2.6.29-rc6] [drm:i915_set_status_page] *ERROR* can not ioremap virtual address for G33 hw status page From: Eric Anholt To: Maciej Rutecki Cc: Linus Torvalds , Linux Kernel Mailing List , Jesse Barnes , "lenb@kernel.org" , Ingo Molnar , mjg@redhat.com, "Rafael J. Wysocki" , Andrew Morton , rui.zhang@intel.com In-Reply-To: <8db1092f0902230646o78a07a09t920ad65369b5a20d@mail.gmail.com> References: <8db1092f0902230646o78a07a09t920ad65369b5a20d@mail.gmail.com> Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="=-d9UK60VbkgjhGAA9KiqI" Date: Mon, 23 Feb 2009 12:02:23 -0800 Message-Id: <1235419343.4816.27.camel@gaiman> Mime-Version: 1.0 X-Mailer: Evolution 2.22.3.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --=-d9UK60VbkgjhGAA9KiqI Content-Type: text/plain Content-Transfer-Encoding: quoted-printable On Mon, 2009-02-23 at 15:46 +0100, Maciej Rutecki wrote: > 2.6.29-rc5 and 2.6.29-rc5-git6 work OK. In 2.6.29-rc6 XWindow (KDM) > doesn't start, from dmesg: >=20 > [ 18.170614] [drm] Initialized drm 1.1.0 20060810 > [ 18.247445] pci 0000:00:02.0: PCI INT A -> GSI 16 (level, low) -> IRQ = 16 > [ 18.247455] pci 0000:00:02.0: setting latency timer to 64 > [ 18.249610] mtrr: type mismatch for d0000000,10000000 old: > write-back new: write-combining > [ 18.249621] [drm] MTRR allocation failed > [ 18.249622] . Graphics performance may suffer. > [ 18.249658] pci 0000:00:02.0: irq 27 for MSI/MSI-X > [ 18.249691] [drm] Initialized i915 1.6.0 20080730 on minor 0 > [ 18.290152] mtrr: type mismatch for d0000000,10000000 old: > write-back new: write-combining > [ 18.567435] set status page addr 0x00043000 > [ 18.567463] [drm:i915_set_status_page] *ERROR* can not ioremap > virtual address for G33 hw status page The non-GEM G33 HWS support is wrong, and has been more or less broken since inception (only now it's failing at startup instead of just being slow). It's doing a mapping of the framebuffer when it should be using a cached mapping of the page backing the framebuffer address. For a quick fix, converting to ioremap_wc will shut the kernel up and get us the old ioremap behavior (whatever the MTRR said, which happens to be WC). --=20 Eric Anholt eric@anholt.net eric.anholt@intel.com --=-d9UK60VbkgjhGAA9KiqI Content-Type: application/pgp-signature; name=signature.asc Content-Description: This is a digitally signed message part -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) iEYEABECAAYFAkmjAM8ACgkQHUdvYGzw6vfvHgCgi7waGd9IC6VD671l3LDgZBTM kHUAoIMnsHVO+NL4orBlCSGQOdvvYBuo =ral7 -----END PGP SIGNATURE----- --=-d9UK60VbkgjhGAA9KiqI--