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=-3.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT 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 53637C5DF61 for ; Thu, 7 Nov 2019 17:41:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 284AC218AE for ; Thu, 7 Nov 2019 17:41:00 +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="cIm6jVZ0" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389538AbfKGRk7 (ORCPT ); Thu, 7 Nov 2019 12:40:59 -0500 Received: from bombadil.infradead.org ([198.137.202.133]:50350 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727132AbfKGRk6 (ORCPT ); Thu, 7 Nov 2019 12:40:58 -0500 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=dLNx8yX02Kzj1oRWP3mQD5vnGq79lBQ8cwVKhpycAZU=; b=cIm6jVZ03X0FF3ZUZEVUBNxG2 TzFrLwgk9odu/08Us6Nlkwas9WZ15XFdpPT2mAfyh3/Q3/Jfr87m38La8EyX3BRe/M5B+OsKGdj78 bLUUAIvM0bNRoeNsydjx3SfAzM8kAGyt4E78aHVnQkSQwU3ifXbxIotnL525AOyqb3r2IXzsDv0K5 DgvUNXavRIyemwxa8KPa9J6lWpHc9hTtoDxV+ZQrBpoU5JEDCWfOy4WXKCChV1Xw2SXz+QHiTWoLC i6PvhObHRRkUQS7SizmzKHusOkrT5aoQyK6Winw83d4cMSqk05qzHLFHvvtU3ShbRr5DoB3Q9XZhg sk/4vf4xw==; Received: from [2001:4bb8:184:e48:c70:4a89:bc61:2] (helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1iSllt-0002NX-Tu; Thu, 07 Nov 2019 17:40:38 +0000 From: Christoph Hellwig To: Jonas Bonn , Stefan Kristiansson , Stafford Horne Cc: Marek Szyprowski , Robin Murphy , Will Deacon , Mark Rutland , openrisc@lists.librecores.org, iommu@lists.linux-foundation.org, linux-arm-kernel@lists.infradead.org, linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org Subject: provide in-place uncached remapping for dma-direct Date: Thu, 7 Nov 2019 18:40:33 +0100 Message-Id: <20191107174035.13783-1-hch@lst.de> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi all, this series provides support for remapping places uncached in-place in the generic dma-direct code, and moves openrisc over from its own in-place remapping scheme. The arm64 folks also had interest in such a scheme to avoid problems with speculating into cache aliases. Also all architectures that always use small page mappings for the kernel and have non-coherent DMA should look into enabling this scheme, as it is much more efficient than the vmap remapping.