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=-2.5 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,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 DAACCC31E4B for ; Fri, 14 Jun 2019 13:47:51 +0000 (UTC) Received: from mail.linuxfoundation.org (mail.linuxfoundation.org [140.211.169.12]) (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 AFBC221537 for ; Fri, 14 Jun 2019 13:47:51 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="Cj3+LM9v" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org AFBC221537 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=iommu-bounces@lists.linux-foundation.org Received: from mail.linux-foundation.org (localhost [127.0.0.1]) by mail.linuxfoundation.org (Postfix) with ESMTP id 2A1ADEC4; Fri, 14 Jun 2019 13:47:50 +0000 (UTC) Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org [172.17.192.35]) by mail.linuxfoundation.org (Postfix) with ESMTPS id F3CA8EC2 for ; Fri, 14 Jun 2019 13:47:46 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) by smtp1.linuxfoundation.org (Postfix) with ESMTPS id A9937E5 for ; Fri, 14 Jun 2019 13:47:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Content-Transfer-Encoding: MIME-Version:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To:Content-Type: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=2klM0787YOypidTxFFKkFXrGCXrbMhQ5qreI3X9Vu1k=; b=Cj3+LM9vIrA6nltYCay8yBPba y6IkbYwpLx9JZh8kK5t2kLy0T8EhKYFLd4ni8FEoVyGRGa1u1i3grWUes4UAS9IJ9k3PGBxh0Ddkp +eH6rF5lBzxCwQMwke6G/c2TJda2p6rGBomPUsGZBfRc0dQxUxHgwIel6XPax0+lxmSXe9hnoqneL tM4WnvDTXZk0YQhKyEzCwXVDmrezpr/WzX/aQS4stZilw7GkSoqCXo2Zka98OqbC6gFV5/7OKNZNF BKEvRnmiaTr9rp4o4Y6qOWysCXUmGZc3uHBgRcuKZdrN51a9q9TVTZ/wz3VsIWst8b5uTNKZ6nDin VS2+DYitQ==; Received: from 213-225-9-13.nat.highway.a1.net ([213.225.9.13] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.92 #3 (Red Hat Linux)) id 1hbmYG-0004Xc-Jk; Fri, 14 Jun 2019 13:47:33 +0000 From: Christoph Hellwig To: Maarten Lankhorst , Maxime Ripard , Sean Paul , David Airlie , Daniel Vetter , Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , Ian Abbott , H Hartley Sweeten Subject: use exact allocation for dma coherent memory Date: Fri, 14 Jun 2019 15:47:10 +0200 Message-Id: <20190614134726.3827-1-hch@lst.de> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Cc: devel@driverdev.osuosl.org, linux-s390@vger.kernel.org, Intel Linux Wireless , linux-rdma@vger.kernel.org, netdev@vger.kernel.org, intel-gfx@lists.freedesktop.org, linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-mm@kvack.org, iommu@lists.linux-foundation.org, "moderated list:ARM PORT" , linux-media@vger.kernel.org X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: iommu-bounces@lists.linux-foundation.org Errors-To: iommu-bounces@lists.linux-foundation.org Hi all, various architectures have used exact memory allocations for dma allocations for a long time, but x86 and thus the common code based on it kept using our normal power of two allocator, which tends to waste a lot of memory for certain allocations. Switching to a slightly cleaned up alloc_pages_exact is pretty easy, but it turns out that because we didn't filter valid gfp_t flags on the DMA allocator, a bunch of drivers were passing __GFP_COMP to it, which is rather bogus in too many ways to explain. Arm has been filtering it for a while, but this series instead tries to fix the drivers and warn when __GFP_COMP is passed, which makes it much larger than just adding the functionality. _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu