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,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 AA4B4C10DCE for ; Fri, 6 Mar 2020 14:23:34 +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 735822070E for ; Fri, 6 Mar 2020 14:23:34 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="XRkNCW49" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 735822070E 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=T/My8xZPcUaksc1qJX5ZHwNI8Qyfa0+H96rp2lrXd/k=; b=XRkNCW49P1Yax4 dAkvpS3pZXGnBrGUv46qnRObC/bxslPuwqk6MKw4uZ+8rhMSTjXoP0eETg8CJPzx1obfURLaWI6Bz xXVlYw3teneT8hwQiWUd5XFDNIytvw7HjJR4SGLPnANnm56gDpnZMOVksv5zc+Sxi3d7vWu/KJNpj u3LP2O3gn7SqBFQWS/wuDwK8JjjSfg8u/xV4CLlRn4bCoUYakUP/Hn7qdHHsJSBVITYtBZgIW1hZV j9QLpHKaDmSuf+mNhBB5v1pMvKvgfhRfyVn6xvD6SmTNClHPkT0HBlkUpgyukKX5YtPOwjtY4rTWR hYgYrsmCV9NBdydeuF4w==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jADsz-0004tj-PI; Fri, 06 Mar 2020 14:23:33 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jADsw-0004sT-Et for linux-arm-kernel@lists.infradead.org; Fri, 06 Mar 2020 14:23:31 +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 6006C31B; Fri, 6 Mar 2020 06:23:23 -0800 (PST) Received: from bogus (e103737-lin.cambridge.arm.com [10.1.197.49]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 2B29E3F534; Fri, 6 Mar 2020 06:23:22 -0800 (PST) Date: Fri, 6 Mar 2020 14:23:13 +0000 From: Sudeep Holla To: Peng Fan , Florian Fainelli Subject: Re: [PATCH V4 2/2] firmware: arm_scmi: add smc/hvc transport Message-ID: <20200306123442.GA47929@bogus> References: <1583201219-15839-1-git-send-email-peng.fan@nxp.com> <1583201219-15839-3-git-send-email-peng.fan@nxp.com> <20200304103954.GA25004@bogus> <20200304170319.GB44525@bogus> <20200305160613.GA53631@bogus> 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-20200306_062330_543845_B9DB1E81 X-CRM114-Status: GOOD ( 22.18 ) 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: "devicetree@vger.kernel.org" , "viresh.kumar@linaro.org" , "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, Mar 06, 2020 at 08:07:19AM +0000, Peng Fan wrote: > > Subject: Re: [PATCH V4 2/2] firmware: arm_scmi: add smc/hvc transport > > > > On 3/5/20 8:06 AM, Sudeep Holla wrote: > > > On Thu, Mar 05, 2020 at 11:25:35AM +0000, Peng Fan wrote: > > > > > > [...] > > > > > >>> > > >>> Yes, this may fix the issue. However I would like to know if we need > > >>> to support multiple channels/shared memory simultaneously. It is > > >>> fair requirement and may need some work which should be fine. > > >> > > >> Do you have any suggestions? Currently I have not worked out an good > > >> solution. > > >> > > > > > > TBH, I haven't given it a much thought. I would like to know if people > > > are happy with just one SMC channel for SCMI or do they need more ? > > > If they need it, we can try to solve it. Otherwise, what you have will > > > suffice IMO. > > > > On our platforms we have one channel/shared memory area/mailbox > > instance for all standard SCMI protocols, and we have a separate > > channel/shared memory area/mailbox driver instance for a proprietary one. > > They happen to have difference throughput requirements, hence the split. > > OK, when you refer proprietary protocol, do you mean outside the scope of SCMI ? The reason I ask is SCMI allows vendor specific protocols and if you are using other channel for that, it still make sense to add multi-channel support here. > > If I read Peng's submission correctly, it seems to me that the usage model > > described before is still fine. > > Thanks. > > Sudeep, > > Then should I repost with the global mutex added? > Sure, you can send the updated. I will think about adding support for more than one channel and send a patch on top of it if I get around it. Note that I sent PR for v5.7 last earlier this week, so this will be for v5.8 -- Regards, Sudeep _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel