From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <SRS0=KdXn=WE=lists.ozlabs.org=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@kernel.org>
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 836ADC433FF
	for <linuxppc-dev@archiver.kernel.org>; Thu,  8 Aug 2019 16:05:22 +0000 (UTC)
Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2])
	(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 05190217F4
	for <linuxppc-dev@archiver.kernel.org>; Thu,  8 Aug 2019 16:05:21 +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="in1PtdbL"
DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 05190217F4
Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de
Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org
Received: from bilbo.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3])
	by lists.ozlabs.org (Postfix) with ESMTP id 464Crb5DDWzDqvy
	for <linuxppc-dev@archiver.kernel.org>; Fri,  9 Aug 2019 02:05:19 +1000 (AEST)
Authentication-Results: lists.ozlabs.org; spf=none (mailfrom)
 smtp.mailfrom=bombadil.srs.infradead.org (client-ip=2607:7c80:54:e::133;
 helo=bombadil.infradead.org;
 envelope-from=batv+66be473deb0ef04076c4+5828+infradead.org+hch@bombadil.srs.infradead.org;
 receiver=<UNKNOWN>)
Authentication-Results: lists.ozlabs.org;
 dmarc=none (p=none dis=none) header.from=lst.de
Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key;
 unprotected) header.d=infradead.org header.i=@infradead.org
 header.b="in1PtdbL"; dkim-atps=neutral
Received: from bombadil.infradead.org (bombadil.infradead.org
 [IPv6:2607:7c80:54:e::133])
 (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)
 key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256)
 (No client certificate requested)
 by lists.ozlabs.org (Postfix) with ESMTPS id 464Cl95SdLzDqdX
 for <linuxppc-dev@lists.ozlabs.org>; Fri,  9 Aug 2019 02:00:35 +1000 (AEST)
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=8DQlBYhOmPMmqBG4Sr4H2tBPKNk8KBZCVUsrJBapL/Q=; b=in1PtdbL1m9Hp49FBJpHwcQpU
 wxiD3OW12EH5x6aOPrIHITqyImqiA20BI/DdbjT6S5BY1PtOcEFUXMZrfRtvhzR2ZzgssxPZRwwbk
 yPiPM2rtUAZ4Y5b9KKBLcC41g1FzN07gpydM/m/IP0DIzcVsmsmb2iYq81tJMBVzdLZQujP2zdLdf
 26akZjGcj22I3tbe6Fouj5vhpP7GRdx01QECa+JWoq9GPapWbdlUCBaYveF2/FGZvzAejY4GpHd5I
 nLh9XZtj+bOHriozy/rP2fBUJYFL64fUPjtFgdrqstxnVxopFbBkgoPuxZirBBq5hhyoq4xiNBdwo
 s2ZuFtQMg==;
Received: from [195.167.85.94] (helo=localhost)
 by bombadil.infradead.org with esmtpsa (Exim 4.92 #3 (Red Hat Linux))
 id 1hvkpl-0006Bi-Ij; Thu, 08 Aug 2019 16:00:26 +0000
From: Christoph Hellwig <hch@lst.de>
To: iommu@lists.linux-foundation.org,
 Marek Szyprowski <m.szyprowski@samsung.com>
Subject: remove default fallbacks in dma_map_ops v3
Date: Thu,  8 Aug 2019 18:59:57 +0300
Message-Id: <20190808160005.10325-1-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 <hch@infradead.org> by
 bombadil.infradead.org. See http://www.infradead.org/rpr.html
X-BeenThere: linuxppc-dev@lists.ozlabs.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Linux on PowerPC Developers Mail List <linuxppc-dev.lists.ozlabs.org>
List-Unsubscribe: <https://lists.ozlabs.org/options/linuxppc-dev>,
 <mailto:linuxppc-dev-request@lists.ozlabs.org?subject=unsubscribe>
List-Archive: <http://lists.ozlabs.org/pipermail/linuxppc-dev/>
List-Post: <mailto:linuxppc-dev@lists.ozlabs.org>
List-Help: <mailto:linuxppc-dev-request@lists.ozlabs.org?subject=help>
List-Subscribe: <https://lists.ozlabs.org/listinfo/linuxppc-dev>,
 <mailto:linuxppc-dev-request@lists.ozlabs.org?subject=subscribe>
Cc: linux-xtensa@linux-xtensa.org, Michal Simek <monstr@monstr.eu>,
 Vladimir Murzin <vladimir.murzin@arm.com>, linux-parisc@vger.kernel.org,
 linux-sh@vger.kernel.org, Takashi Iwai <tiwai@suse.de>,
 linuxppc-dev@lists.ozlabs.org, Helge Deller <deller@gmx.de>, x86@kernel.org,
 linux-kernel@vger.kernel.org, linux-m68k@lists.linux-m68k.org,
 Robin Murphy <robin.murphy@arm.com>, linux-arm-kernel@lists.infradead.org
Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org
Sender: "Linuxppc-dev"
 <linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org>

Hi all,

we have a few places where the DMA mapping layer has non-trivial default
actions that are questionable and/or dangerous.

This series instead wires up the mmap, get_sgtable and get_required_mask
methods explicitly and cleans up some surrounding areas.  This also means
we could get rid of the ARCH_NO_COHERENT_DMA_MMAP kconfig option, as we
now require a mmap method wired up, or in case of non-coherent dma-direct
the presence of the arch_dma_coherent_to_pfn hook.  The only interesting
case is that the sound code also checked the ARCH_NO_COHERENT_DMA_MMAP
symbol in somewhat odd ways, so I'd like to see a review of the sound
situation before going forward with that patch.

Changes since v2:
 - fix use of dma_can_mmap in alsa
 - improve the CONFIG_* mess a little more

Changes since v1:
 - add a dma_can_mmap helper for alsa