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=-11.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 E833CC433C1 for ; Sun, 21 Mar 2021 18:55:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9BC306194C for ; Sun, 21 Mar 2021 18:55:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230157AbhCUSzX (ORCPT ); Sun, 21 Mar 2021 14:55:23 -0400 Received: from ste-pvt-msa2.bahnhof.se ([213.80.101.71]:17236 "EHLO ste-pvt-msa2.bahnhof.se" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230064AbhCUSzC (ORCPT ); Sun, 21 Mar 2021 14:55:02 -0400 Received: from localhost (localhost [127.0.0.1]) by ste-pvt-msa2.bahnhof.se (Postfix) with ESMTP id AA3483F63C; Sun, 21 Mar 2021 19:46:10 +0100 (CET) Authentication-Results: ste-pvt-msa2.bahnhof.se; dkim=pass (1024-bit key; unprotected) header.d=shipmail.org header.i=@shipmail.org header.b=RmWTAfau; dkim-atps=neutral X-Virus-Scanned: Debian amavisd-new at bahnhof.se Authentication-Results: ste-ftg-msa2.bahnhof.se (amavisd-new); dkim=pass (1024-bit key) header.d=shipmail.org Received: from ste-pvt-msa2.bahnhof.se ([127.0.0.1]) by localhost (ste-ftg-msa2.bahnhof.se [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id iRxq6b07VQNg; Sun, 21 Mar 2021 19:46:09 +0100 (CET) Received: by ste-pvt-msa2.bahnhof.se (Postfix) with ESMTPA id 535103FEC9; Sun, 21 Mar 2021 19:46:08 +0100 (CET) Received: from localhost.localdomain (2.70.38.73.mobile.tre.se [2.70.38.73]) by mail1.shipmail.org (Postfix) with ESMTPSA id 60178361E58; Sun, 21 Mar 2021 19:46:07 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=shipmail.org; s=mail; t=1616352368; bh=tpeEGuLEfQbIt3oYJJ199Odz5KIao0YiVWQXjQK8Lz8=; h=From:To:Cc:Subject:Date:From; b=RmWTAfauY4F3Mp79+y8c8xmdXcwmIyMEawbzs1nWiS50q/d34+9fMyikQDrWwmL7r JQewrmix+tKc9qc01LwSAIazwqYJGlwnJ4hOQ5q5C7AkB9dAJN3Tm4HQ9qyX1TQ6rI +SrDCDkneIo5NT8q+PUBouUIxexKDxTFW7yihLuE= From: =?UTF-8?q?Thomas=20Hellstr=C3=B6m=20=28Intel=29?= To: dri-devel@lists.freedesktop.org Cc: =?UTF-8?q?Thomas=20Hellstr=C3=B6m=20=28Intel=29?= , Christian Koenig , David Airlie , Daniel Vetter , Andrew Morton , Jason Gunthorpe , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [RFC PATCH 0/2] mm,drm/ttm: Always block GUP to TTM pages Date: Sun, 21 Mar 2021 19:45:27 +0100 Message-Id: <20210321184529.59006-1-thomas_os@shipmail.org> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org get_user_pages() to TTM pages is uwanted since TTM assumes it owns the pages exclusively and / or sets up page-table mappings to io memory. The first patch make sures we stop fast gup to huge TTM pages using a trick with pmd_devmap() and pud_devmap() without a backing dev_pagemap. The second patch makes sure we block normal gup by setting VM_PFNMAP Cc: Christian Koenig Cc: David Airlie Cc: Daniel Vetter Cc: Andrew Morton Cc: Jason Gunthorpe Cc: linux-mm@kvack.org Cc: dri-devel@lists.freedesktop.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Thomas Hellström (Intel)