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=-5.5 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 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 21976C433E0 for ; Wed, 27 Jan 2021 02:03:58 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (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 B916D2064C for ; Wed, 27 Jan 2021 02:03:57 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B916D2064C Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=huawei.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:Date:Message-ID:From: References:To:Subject:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=w4yONkoIO3jlVas7AhQc+cebqR5a02b2DTAIHay/DNo=; b=wVvr0EFbrrD7mCFwfyBrfTrLr scsY0TvbpmblB8+sQOm7iIEoVYvoC85eYQnjmxveGhjVet6a3cYkS1leTMTMCahj2RtRUrLIZyycS 1U45dKYX4M1Q90bQ5FGPETn7yNHY3odJT3YAN2lj1ZCnOyeMRt9gca1AQ3X15nOg92VQULl7hhINn N3BvbK3i2eoFWi7rjH2ZvQWaftSWXa1SHyUWgl0yXzoGJ0MebWYGYO5bojxGgZ3hZ9E+FkE7FhxkP q+SXOX5veyTFoLFaF3nZzGw4Wfpf2Jp9I5/jV+nhxzVs/HeqkUDc9bTEg6uwADWGiyjbFUwzbu/Yf qZUzqamhQ==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1l4a9e-0000zy-MP; Wed, 27 Jan 2021 02:01:58 +0000 Received: from szxga07-in.huawei.com ([45.249.212.35]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1l4a9a-0000yd-5z for linux-arm-kernel@lists.infradead.org; Wed, 27 Jan 2021 02:01:56 +0000 Received: from DGGEMS406-HUB.china.huawei.com (unknown [172.30.72.60]) by szxga07-in.huawei.com (SkyGuard) with ESMTP id 4DQRdZ1nkLz7bgc; Wed, 27 Jan 2021 10:00:34 +0800 (CST) Received: from [127.0.0.1] (10.174.176.220) by DGGEMS406-HUB.china.huawei.com (10.3.19.206) with Microsoft SMTP Server id 14.3.498.0; Wed, 27 Jan 2021 10:01:35 +0800 Subject: Re: [PATCH 1/1] iommu/arm-smmu-v3: add support for BBML To: Will Deacon , Robin Murphy References: <20201126034230.777-1-thunder.leizhen@huawei.com> <20210122125132.GB24102@willie-the-truck> <1bfd1ca0-953e-e943-f87e-144d5537bd0c@arm.com> <20210126101230.GA29204@willie-the-truck> From: "Leizhen (ThunderTown)" Message-ID: <8a9685ec-67aa-824f-5429-f408bf79c5ab@huawei.com> Date: Wed, 27 Jan 2021 10:01:34 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <20210126101230.GA29204@willie-the-truck> Content-Language: en-US X-Originating-IP: [10.174.176.220] X-CFilter-Loop: Reflected X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210126_210155_025590_58AC3150 X-CRM114-Status: GOOD ( 11.41 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Jean-Philippe Brucker , Joerg Roedel , Yang Yingliang , linux-kernel , iommu , Jonathan Cameron , linux-arm-kernel Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 2021/1/26 18:12, Will Deacon wrote: > On Mon, Jan 25, 2021 at 08:23:40PM +0000, Robin Murphy wrote: >> Now we probably will need some degreee of BBML feature awareness for the >> sake of SVA if and when we start using it for CPU pagetables, but I still >> cannot see any need to consider it in io-pgtable. > > Agreed; I don't think this is something that io-pgtable should have to care > about. Yes, the SVA works in stall mode, and the failed device access requests are not discarded. Let me look for examples. The BBML usage scenario was told by a former colleague. > > Will > > . > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel