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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A4155C433F5 for ; Fri, 10 Dec 2021 14:16:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238559AbhLJOUR (ORCPT ); Fri, 10 Dec 2021 09:20:17 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52850 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238547AbhLJOUQ (ORCPT ); Fri, 10 Dec 2021 09:20:16 -0500 Received: from mail-ot1-x32f.google.com (mail-ot1-x32f.google.com [IPv6:2607:f8b0:4864:20::32f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D52E2C061746 for ; Fri, 10 Dec 2021 06:16:41 -0800 (PST) Received: by mail-ot1-x32f.google.com with SMTP id w6-20020a9d77c6000000b0055e804fa524so9754663otl.3 for ; Fri, 10 Dec 2021 06:16:41 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=EOSoarCCbZM7dlcjmgAvZBd2Ge5y+aGOq0kCRiTe4tw=; b=lsFSompV1OCJP8n00tqcmPhSB4U7IEQ6pnwkl8mM6i6SPt5ZGXNzqYRzrPCP5ycozH Lc3LBns3JreH4ulGaPEkT0EvnFOmNL1PcYb0Qw+uUvtessMSUOo98/sZ/GLwK8Gt54VH A1uDTNRyt4uJ9V17abTvznDzwv6cXKkwpOOtBGseHvco62o5nH5qrvscNezxp31rzhLW XSI2SOU7HaIxeJs/iVe+prYJRREV0R/BLvqXBg14JIr8UtOAFmNTWCeukrXynVoTExe+ HWbjByukta9YKjkT+O5Ei/60PnnNLqkikjpNVlrxuUuduCHmGGxBAazDgtSIKxGB9eTR oC6w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=EOSoarCCbZM7dlcjmgAvZBd2Ge5y+aGOq0kCRiTe4tw=; b=s1Ui2CCjpSW9/n6b+Tc9rBZSXXbEdXcS56dlvkxGGBYk2ZE3IwumjIijDBn2EaeeDV gQbUPYHKshEDlFzNRy0OPmQM4vyPWpFrtTkpg6PtXtRUYZ5pnPN6h/tr3Ri/ExHiZkfu J6VHWm74/LXJXcCh9wFCgs34hAFKS9hdfgLx53eKJz//fBtiSiWYqHU4DVbXTXOI1quE KwJRQSF/mnfVa1ZSwXK3DRht4iffm7pDN9t1drRISdiL50wNRW7iKjy66s0ueivaJszc e5i1G+7hPXXOwKn5BktIepYDn1xx4lay9bQfPnwrzfC4dYWF9jrbEdsFuRDPvyHevw7J kYeA== X-Gm-Message-State: AOAM532hysefEk9ESlO4l5M6SkLErHvsxJvTRHjvZLsHD4BcFwyAvh2d P5CopO5/LCIcB5t5OG8y/6Y9ZUFnhElRLksJYXw= X-Google-Smtp-Source: ABdhPJzxEixHNY/ukDs1bIqZdHB/bSDP4VRdSeRVaKe8t7pjUL4W1JYcWPxk99li/psv45WFTLJCZZdgC34P0aaSQV4= X-Received: by 2002:a05:6830:1bcf:: with SMTP id v15mr11608187ota.200.1639145801225; Fri, 10 Dec 2021 06:16:41 -0800 (PST) MIME-Version: 1.0 References: <62aab616-53cb-ff9f-c5f3-169c547bd1ee@igalia.com> <6d3c7acf-a23f-3073-56ed-375ccb8cc815@suse.de> <99b38881-8c63-de04-50f8-aa4119b52b25@igalia.com> In-Reply-To: <99b38881-8c63-de04-50f8-aa4119b52b25@igalia.com> From: Alex Deucher Date: Fri, 10 Dec 2021 09:16:30 -0500 Message-ID: Subject: Re: Reuse framebuffer after a kexec (amdgpu / efifb) To: "Guilherme G. Piccoli" Cc: Thomas Zimmermann , Gerd Hoffmann , "open list:EFIFB FRAMEBUFFER DRIVER" , kexec@lists.infradead.org, amd-gfx list , kernel@gpiccoli.net, Baoquan He , =?UTF-8?Q?Samuel_Iglesias_Gons=C3=A1lvez?= , xinhui pan , Maling list - DRI developers , pjones@redhat.com, "Deucher, Alexander" , Dave Young , Christian Koenig , Vivek Goyal Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-fbdev@vger.kernel.org On Fri, Dec 10, 2021 at 9:09 AM Guilherme G. Piccoli wrote: > > Thanks a lot Alex / Gerd and Thomas, very informative stuff! I'm glad > there are projects to collect/save the data and reuse after a kdump, > this is very useful. > > I'll continue my study on the atombios thing of AMD and QXL, maybe at > least we can make it work in qemu, that'd be great (like a small > initdriver to reprogram de paravirtual device on kexec boot). Why not just reload the driver after kexec? Alex > > Cheers, > > > Guilherme