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=-2.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,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 95956C38A2A for ; Thu, 7 May 2020 13:02:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 697A9208DB for ; Thu, 7 May 2020 13:02:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588856538; bh=FOLAqCJSZFjeRrOo2AB0h8nYBfFZfVGOKBM3v6LFHEc=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=Eap2af9hKyGw5ULuiTQTkRmg0zE4mRSgTX/5rRbu1hhKLOkim5yObUGwbOKkMHtEo vv1/wFxokXAaVNSTOcC2jID3Cyhx4WY5B4uzFniPeEfFhiZlPy/DYtI0u9xEXNTtW6 K2JThzR6rrWdXMrWQkUeUDFMwC8lCNFeB/eARhJY= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726350AbgEGNCR (ORCPT ); Thu, 7 May 2020 09:02:17 -0400 Received: from mail.kernel.org ([198.145.29.99]:40992 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725857AbgEGNCR (ORCPT ); Thu, 7 May 2020 09:02:17 -0400 Received: from willie-the-truck (236.31.169.217.in-addr.arpa [217.169.31.236]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id CCD58208D6; Thu, 7 May 2020 13:02:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588856537; bh=FOLAqCJSZFjeRrOo2AB0h8nYBfFZfVGOKBM3v6LFHEc=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=hPdVXwPH7TI3PLb2Kzf96tHmWwUOaHaRsR9QY3oETGLePCe9qnlm3SrHoIHVJvrhl USV/bVxAywRxh3AAjmb8S7vCYFM5W9+E/KCoYipYYHVLXWsh1cDrwIfRPR5fgggIzI QUXnyvUgJqyr8F5xVYoQdqXVxsH20PpnU3tHRjQw= Date: Thu, 7 May 2020 14:02:11 +0100 From: Will Deacon To: Sai Prakash Ranjan Cc: Robin Murphy , Joerg Roedel , Sibi Sankar , 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 Subject: Re: [PATCHv4 4/6] iommu/arm-smmu-qcom: Request direct mapping for modem device Message-ID: <20200507130210.GB31783@willie-the-truck> References: <8ef5d93c74f5cd9e4a6edab86d1d46efbf3aa038.1587407458.git.saiprakash.ranjan@codeaurora.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <8ef5d93c74f5cd9e4a6edab86d1d46efbf3aa038.1587407458.git.saiprakash.ranjan@codeaurora.org> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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? Will