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=-2.3 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,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 3F019C3A5A4 for ; Fri, 30 Aug 2019 09:30:17 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 1234023427 for ; Fri, 30 Aug 2019 09:30:17 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="DE7uWBNS" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1234023427 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-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=bombadil.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:References: Message-ID:Subject:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=y0RQZvAIj/nLgYWUOhh/5q0DD8F0+L1GirbFNWaYdRQ=; b=DE7uWBNSIQAZPq 6uT1Og3qYrTyVhjmIJfX9wGI4wqqnZapdUwfA7k51hEsEH9n6kZRq0tJ4/aOWdXuaRKv/g0GgmWGA U/bdYIqEVDJIzRTi4oemeWfLAr4hAB6Jhqez/8EaBJ+kt6g0D5GQW+MG5S6uDyn6tPdT3SlZ+y5Ko nLxkhSc+rip1MDddCu1HYKi1w2Mwo+qn5J2A7A2kGAlIOdmGQJQj97ytfWyjl8rQ7WGMy0ZSuQED0 PXnJ6hGa2iiO8TapCkrpFBcr3Mcbsh2tIM1hT0kfn2WfU7iabX9jF5nCaB2ZH7jT9+g5gM97zDBgu PEKSI2FhTSE7SSOzuvPQ==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1i3dEW-0005Ly-LT; Fri, 30 Aug 2019 09:30:16 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1i3dEU-0005LI-7t for linux-arm-kernel@lists.infradead.org; Fri, 30 Aug 2019 09:30:15 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id D1382344; Fri, 30 Aug 2019 02:30:11 -0700 (PDT) Received: from bogus (e107155-lin.cambridge.arm.com [10.1.196.42]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 60AAF3F718; Fri, 30 Aug 2019 02:30:10 -0700 (PDT) Date: Fri, 30 Aug 2019 10:30:05 +0100 From: Sudeep Holla To: Peng Fan Subject: Re: [PATCH v5 1/2] dt-bindings: mailbox: add binding doc for the ARM SMC/HVC mailbox Message-ID: <20190830093005.GA31297@bogus> References: <1567004515-3567-1-git-send-email-peng.fan@nxp.com> <1567004515-3567-2-git-send-email-peng.fan@nxp.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.9.4 (2018-02-28) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190830_023014_324950_BDA300B0 X-CRM114-Status: GOOD ( 12.66 ) 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: "mark.rutland@arm.com" , "devicetree@vger.kernel.org" , "f.fainelli@gmail.com" , "andre.przywara@arm.com" , Jassi Brar , "linux-kernel@vger.kernel.org" , "robh+dt@kernel.org" , dl-linux-imx , Sudeep Holla , "linux-arm-kernel@lists.infradead.org" Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, Aug 30, 2019 at 07:37:41AM +0000, Peng Fan wrote: > Hi Jassi, > > > I think there could be channel for TEE, and channel for Linux. > > > For virtualization case, there could be dedicated channel for each VM. > > > > > I am talking from Linux pov. Functions 0xfe and 0xff above, can't both be > > active at the same time, right? > > If I get your point correctly, > On UP, both could not be active. On SMP, tx/rx could be both active, anyway > this depends on secure firmware and Linux firmware design. > Just to confirm, we can't have SMC/HVC based Rx channel as there's no *architectural* way to achieve it. So it can be based on some interrupt from secure side and hence will be a *different* type of channel/controller. Sorry to make this point repeatedly, but juts to be absolutely clear: as it stands, SMC/HVC can be used only for Tx today. -- Regards, Sudeep _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel