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=-0.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 BABBFC38A2A for ; Thu, 7 May 2020 14:14:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9613A2083B for ; Thu, 7 May 2020 14:14:05 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=mg.codeaurora.org header.i=@mg.codeaurora.org header.b="jXq0HKJw" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727802AbgEGOOF (ORCPT ); Thu, 7 May 2020 10:14:05 -0400 Received: from mail26.static.mailgun.info ([104.130.122.26]:22299 "EHLO mail26.static.mailgun.info" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726393AbgEGOOE (ORCPT ); Thu, 7 May 2020 10:14:04 -0400 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1588860843; h=Message-ID: References: In-Reply-To: Subject: Cc: To: From: Date: Content-Transfer-Encoding: Content-Type: MIME-Version: Sender; bh=ouV/sAAm+HHkNw8+tVJPzvplbCTaOzR2TqpfgCh2bos=; b=jXq0HKJwomj9e1xe6cVZXopppxr4CflWAATwBwrK35BfeIbWgPhPiQFKhrNBDmUZK/fyOf8t /bxhjCrHeXzVsPcqofzWrn0pMERMXEAuuo/9nZL+vStiypWoFEoiHiTfPCNtCTfKFc9M1BaF zoht9H9lz5VNixo1cyPnqQ8eSQ8= X-Mailgun-Sending-Ip: 104.130.122.26 X-Mailgun-Sid: WyI0MWYwYSIsICJsaW51eC1rZXJuZWxAdmdlci5rZXJuZWwub3JnIiwgImJlOWU0YSJd Received: from smtp.codeaurora.org (ec2-35-166-182-171.us-west-2.compute.amazonaws.com [35.166.182.171]) by mxa.mailgun.org with ESMTP id 5eb417aa.7f54e805f5a8-smtp-out-n02; Thu, 07 May 2020 14:14:02 -0000 (UTC) Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 9F620C4478C; Thu, 7 May 2020 14:14:02 +0000 (UTC) Received: from mail.codeaurora.org (localhost.localdomain [127.0.0.1]) (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) (Authenticated sender: sibis) by smtp.codeaurora.org (Postfix) with ESMTPSA id DC865C433F2; Thu, 7 May 2020 14:14:01 +0000 (UTC) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 7bit Date: Thu, 07 May 2020 19:44:01 +0530 From: Sibi Sankar To: Will Deacon Cc: Sai Prakash Ranjan , Robin Murphy , Joerg Roedel , Bjorn Andersson , Jordan Crouse , Rob Clark , Stephen Boyd , iommu@lists.linux-foundation.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, Matthias Kaehlcke , Evan Green , linux-kernel-owner@vger.kernel.org Subject: Re: [PATCHv4 4/6] iommu/arm-smmu-qcom: Request direct mapping for modem device In-Reply-To: <20200507130210.GB31783@willie-the-truck> References: <8ef5d93c74f5cd9e4a6edab86d1d46efbf3aa038.1587407458.git.saiprakash.ranjan@codeaurora.org> <20200507130210.GB31783@willie-the-truck> Message-ID: X-Sender: sibis@codeaurora.org User-Agent: Roundcube Webmail/1.3.9 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hey WIll, On 2020-05-07 18:32, Will Deacon wrote: > On Tue, Apr 21, 2020 at 12:03:52AM +0530, Sai Prakash Ranjan wrote: >> From: Sibi Sankar >> >> The Q6 modem sub-system has direct access to DDR through memnoc. >> Also SMMU is not expected to provide access control/translation >> for these SIDs (sandboxing of the modem is achieved through XPUs >> engaged using SMC calls). So request direct mapping for modem on >> platforms which don't have TrustZone. > > The Z7 space rocket framework has limited access to water through > BROADCHAN. > Also, this commit message really sucks. So please can you rewrite it in > a > way that makes sense to people outside of your office? lol, sure I'll re-word ^^ tday > > Will -- Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.