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 7BCC5C0650F for ; Mon, 5 Aug 2019 09:12:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 537202067D for ; Mon, 5 Aug 2019 09:12:12 +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="YQCIQZU1" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728009AbfHEJML (ORCPT ); Mon, 5 Aug 2019 05:12:11 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:34056 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727225AbfHEJMK (ORCPT ); Mon, 5 Aug 2019 05:12:10 -0400 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=wo3Nidt8ANHCfxiPlT6m8OyX2VllNhDuCO+MMrpvH/I=; b=YQCIQZU18z4XZ7xnEFtZ3cpMK Uh746e5z0+Ze8+no/kJTHFcXr5n7M0AigP68dRR1vaD8C1IiKx8GBDdf+pTzNpolrmVo1vXwL8O4U pofCvygM9ItpBTVbSIdiKx4Ft7TZqBmRFyRENOXy+ZZg6BYCdfwmlWAsyWiXXHCRkq/ZLfU24iiAl fQLrtCnL1CSEVtWnVBNfyY4ZjE+J6QuKWe2eNjfqO42FtjBo8AHpHvePL2TgIB5XCrqGiq1pT9rm2 DwKvITQk1WE+AxkNw2InQLevcg8OBP9uZdEp/+LIuplG6j7mSGycvzt89x7fskUuyhyD2Jv80Uxoi tcepYDwPg==; Received: from [195.167.85.94] (helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.92 #3 (Red Hat Linux)) id 1huZ28-0004qn-Vz; Mon, 05 Aug 2019 09:12:01 +0000 From: Christoph Hellwig To: iommu@lists.linux-foundation.org, Marek Szyprowski Cc: Takashi Iwai , Robin Murphy , Michal Simek , linux-arm-kernel@lists.infradead.org, linux-m68k@lists.linux-m68k.org, linux-parisc@vger.kernel.org, linux-sh@vger.kernel.org, linux-xtensa@linux-xtensa.org, linuxppc-dev@lists.ozlabs.org, x86@kernel.org, linux-kernel@vger.kernel.org Subject: remove default fallbacks in dma_map_ops v2 Date: Mon, 5 Aug 2019 12:11:52 +0300 Message-Id: <20190805091159.7826-1-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, 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 v1: - add a dma_can_mmap helper for alsa