From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.3 required=3.0 tests=DKIM_ADSP_CUSTOM_MED, DKIM_INVALID,DKIM_SIGNED,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6BD40C47255 for ; Mon, 11 May 2020 20:51:55 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 37156206D7 for ; Mon, 11 May 2020 20:51:55 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="o+7Ut8Ja" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 37156206D7 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id B26E96E58A; Mon, 11 May 2020 20:51:54 +0000 (UTC) Received: from mail-wm1-x32e.google.com (mail-wm1-x32e.google.com [IPv6:2a00:1450:4864:20::32e]) by gabe.freedesktop.org (Postfix) with ESMTPS id F36976E58A for ; Mon, 11 May 2020 20:51:52 +0000 (UTC) Received: by mail-wm1-x32e.google.com with SMTP id g12so20924199wmh.3 for ; Mon, 11 May 2020 13:51:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=rkikq0zDsxgZt2W2jtJbRT70OAbPB2Rkt0vH5UDJcS0=; b=o+7Ut8Jag9RWpvLoH11fEO6vIhINeYGTOmAxLWkr8sUBh/tLA/vG7hh+uFjfmN5nEA 6HJLJZxV6GflCVeZWq31KFMdQ2PGlfH2WBIsQuCxyk0vmMEZ0jU80svp+SShggTd6T2y G+VcSc+Z6S7v8eTjNB2lKwkvDRwu2EjE6UpDkAnehrzYVquspzQTGOtx0vseQDC/jFeG BZJF6Zq17YSMvnTd5mpT6+6cqcbeOdovW9Pl8MWHBlAimB5z3gnPbh5b4HgYicOI391x T1pqeoZGv2xFvv7EQD4bvnXWWgJmf5V/P2kLehsukETdRD59tDCaLUTSInS4SHbda6Mc WM1w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=rkikq0zDsxgZt2W2jtJbRT70OAbPB2Rkt0vH5UDJcS0=; b=B1DQaQGYJfOctG052qkjwsUbvTczNpvsaBSPcoNYFjRtLlekS6iWEoOFRw/l4aeUSE QcI+iDIDwlnfbWl4iaZxa1sZ+CXJ+SzoqOsUijpgcSTYUNfbLcZVbR3qfTHfob4SoKx5 Bz0rhIhB1iwQ81O4CdwnGXJPFseEzPJYwADsFyATjCtJ8pYXxuDYsiU5SoCbO/kf6QHY 80zDg7m+iwcW7ER+5KcG/VewyLijbgDO1AK5Pr9+wjYChviLUdRpgny9IEcyrcs15g/E pfoj6DT+ALawMv9PTymL92pw5I0AWwrl97dZs2K3eWQhkuy77RURayniErLk+ftD3NZ8 D7/Q== X-Gm-Message-State: AGi0Pub/YGGTPLY31+bIJq7n6jcydmOV5WeMyWBg3kJnFT2I0UY92ha2 sfVVafc7WzBU5yBb+p0VB0F5Yo/QpHF31pjpUO5laQ== X-Google-Smtp-Source: APiQypI35SgzQ9lRlgIBY5BZtIhkcQCQXrQ1nwqU7bzCxY63uI41lYvdt12rJwX0qzG6xJB7ff7RqTBXwNpk//dOqp8= X-Received: by 2002:a1c:98c7:: with SMTP id a190mr16513543wme.56.1589230311626; Mon, 11 May 2020 13:51:51 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: From: Alex Deucher Date: Mon, 11 May 2020 16:51:40 -0400 Message-ID: Subject: Re: [RFC] Remove AGP support from Radeon/Nouveau/TTM To: Rui Salvaterra X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: =?UTF-8?Q?Christian_K=C3=B6nig?= , "debian-powerpc@lists.debian.org" , Maling list - DRI developers , John Paul Adrian Glaubitz Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" On Mon, May 11, 2020 at 4:25 PM Rui Salvaterra wrote: > > > > A segunda, 11/05/2020, 21:21, Alex Deucher escreveu: >> >> >> >> Note there is no loss of functionality here, at least on radeon >> hardware. It just comes down to which MMU gets used for access to >> system memory, the AGP MMU on the chipset or the MMU built into the >> GPU. On powerpc hardware, AGP has been particularly unstable, and >> IIRC, AGP has been disabled by default on radeon on powerpc for a >> while. > > > So this basically just drops support for the AGP GART? What happens to the AGP signalling rates (beyond the base rate)? I don't remember enough of the details, but I strongly doubt it was related to which MMU was used per se. On r1xx/r2xx parts, AGP was effectively the non-snooped route to memory and the internal MMU only provided snooped (coherent) access to memory. That and the limited TLB space are probably want limited performance in that case. I don't recall what sort of TLBs the chipset GART tables provided. On r3xx and newer the, on-chip MMU supported both snooped and unsnooped transactions and had more TLB space so the difference wasn't significant IIRC. Alex _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel