Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752304AbdGRWWq (ORCPT ); Tue, 18 Jul 2017 18:22:46 -0400 Received: from mail-oi0-f50.google.com ([209.85.218.50]:36034 "EHLO mail-oi0-f50.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751846AbdGRWWo (ORCPT ); Tue, 18 Jul 2017 18:22:44 -0400 MIME-Version: 1.0 In-Reply-To: References: <20170718060909.5280-1-airlied@redhat.com> <20170718143404.omgxrujngj2rhiya@redhat.com> From: Linus Torvalds Date: Tue, 18 Jul 2017 15:22:43 -0700 X-Google-Sender-Auth: 5WFCMSIeZyUCqPCX64TrJ1GN8jg Message-ID: Subject: Re: [PATCH] efifb: allow user to disable write combined mapping. To: Dave Airlie Cc: Peter Jones , "the arch/x86 maintainers" , Dave Airlie , Bartlomiej Zolnierkiewicz , "linux-fbdev@vger.kernel.org" , Linux Kernel Mailing List , Andrew Lutomirski , Peter Anvin Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1088 Lines: 23 On Tue, Jul 18, 2017 at 2:21 PM, Dave Airlie wrote: > > Oh and just FYI, the machine I've tested this on has an mgag200 server > graphics card backing the framebuffer, but with just efifb loaded. Yeah, it looks like it needs special hardware - and particularly the kind of garbage hardware that people only have on servers. Why do server people continually do absolute sh*t hardware? It's crap, crap, crap across the board outside the CPU. Nasty and bad hacky stuff that nobody else would touch with a ten-foot pole, and the "serious enterprise" people lap it up like it was ambrosia. It's not just "graphics is bad anyway since we don't care". It's all the things they ostensibly _do_ care about too, like the disk and the fabric infrastructure. Buggy nasty crud. Anyway, rant over. I wonder if we could show this without special hardware by just mapping some region that doesn't even have hardware in it as WC. Do we even expose the PAT settings to user space, though, or do we always have to have some fake module to create the PAT stuff? Linus