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=-5.2 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=unavailable 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 D6448C0650F for ; Mon, 5 Aug 2019 08:06:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B105E20679 for ; Mon, 5 Aug 2019 08:06:35 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=cogentembedded-com.20150623.gappssmtp.com header.i=@cogentembedded-com.20150623.gappssmtp.com header.b="OKXu80bh" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727812AbfHEIGe (ORCPT ); Mon, 5 Aug 2019 04:06:34 -0400 Received: from mail-lj1-f196.google.com ([209.85.208.196]:36527 "EHLO mail-lj1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726659AbfHEIGe (ORCPT ); Mon, 5 Aug 2019 04:06:34 -0400 Received: by mail-lj1-f196.google.com with SMTP id i21so78497867ljj.3 for ; Mon, 05 Aug 2019 01:06:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cogentembedded-com.20150623.gappssmtp.com; s=20150623; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=4jotGUYX3HDjIjrPWkq93S31gJkGTLLQx5i8QIerKxE=; b=OKXu80bhtKFjmm2MpkIDYVWmXqi7Y+Xjky/uEczjP2Zl5b7vO97lSZ4GxsSOJjZduQ VgPXNXexmCAKG6Z+637VhMExKFfEjxuDw3H3mRcIbO3qLRCxF1TJiOxHnvXkyL1xl5hz 9tSzcuFZEaM47GjqXTJ6n5YnEqhbYAzKlpVrDHKCy9VeCfnp53elgyy+VMv+lz31Ers7 Eic301vKwslj47MtbPz81DyzufZoA3sVB/fmBoMeBi2wwb65qyfXQctIncrR9gNzSMvv ew3Ty0ZvYjqCUhy9kY7gTZ+iW4B61AZpbS675ligIs/I+dyRKPx83vFtsSrTsvbz0lFJ WX4w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=4jotGUYX3HDjIjrPWkq93S31gJkGTLLQx5i8QIerKxE=; b=WaMpPYzTmmkmUuODPEE7LUsOAFrgnjIOCHjgdm9LMVQUJtyBYLp+BADaMI3gPmYE2s tLptodLCGxMAAZyjOne9Z+DI9QkXZc3R4vhK6IAytHYRUGRph1M8YNOnSHkS1ZnNVj/b TsCamwgWehD7hlCTOWFNBDKecUZeroBm8gph6rI5sMpj1IIY/a2+KA7IG3RDabxUpm35 M8prAkb9ZAJ/JjLj7hPKLyNtkXRVBYYEz16D9hgp6y3xHo2vEwNF6/lo7l6EZ1jk+UVh 3GvzTMC3R9z/YsQF1oBByfN5QDepHu5OEa5bs0v7BelKWMW34d037eTgz83+6ONgilni l8qg== X-Gm-Message-State: APjAAAVtXi/oyZgWDXxJ/fhPT94apg27eu/HsKCNXplTpDjMeFfIB0gG BriBuIkwxmgt9enebEUn6djfCLDv6NH+iQ== X-Google-Smtp-Source: APXvYqyZpQSVk777vhC2lpS6B8C38YOlvgzOQV2vQdpdrwUMZBvpR5l2r7dZg3bY6N4q4hVA/QRa0Q== X-Received: by 2002:a2e:9b48:: with SMTP id o8mr78054712ljj.122.1564992392086; Mon, 05 Aug 2019 01:06:32 -0700 (PDT) Received: from ?IPv6:2a00:1fa0:44f5:2f9a:806:ec14:8a98:a30c? ([2a00:1fa0:44f5:2f9a:806:ec14:8a98:a30c]) by smtp.gmail.com with ESMTPSA id l24sm17213019lji.78.2019.08.05.01.06.30 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 05 Aug 2019 01:06:31 -0700 (PDT) Subject: Re: [PATCH 2/2] MIPS: remove support for DMA_ATTR_WRITE_COMBINE To: Christoph Hellwig , iommu@lists.linux-foundation.org Cc: Shawn Anastasio , Michael Ellerman , Russell King , Catalin Marinas , Will Deacon , Robin Murphy , Paul Burton , James Hogan , linuxppc-dev@lists.ozlabs.org, linux-mips@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org References: <20190805080145.5694-1-hch@lst.de> <20190805080145.5694-3-hch@lst.de> From: Sergei Shtylyov Message-ID: Date: Mon, 5 Aug 2019 11:06:24 +0300 User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <20190805080145.5694-3-hch@lst.de> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello! On 05.08.2019 11:01, Christoph Hellwig wrote: > Mips uses the KSEG1 kernel memory segment do map dma coherent MIPS. s/do/to/? > allocations for n on-coherent devices as uncachable, and does not have Uncacheable? > any kind of special support for DMA_ATTR_WRITE_COMBINE in the allocation > path. Thus supporting DMA_ATTR_WRITE_COMBINE in dma_mmap_attrs will > lead to multiple mappings with different caching attributes. > > Fixes: 8c172467be36 ("MIPS: Add implementation of dma_map_ops.mmap()") > Signed-off-by: Christoph Hellwig [...] MBR, Sergei