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 1641EC433E0 for ; Wed, 3 Jun 2020 18:12:02 +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 B788E20734 for ; Wed, 3 Jun 2020 18:12:01 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="dWHjBctg" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B788E20734 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=XyU1yoG5y+JNeO16TtdcTRbYS4Q1ARbkARddePj3b3k=; b=dWHjBctgcF/AzT q6eZ6TQfAzRUHbyFF/YeoVRWe81K5niM4nHWIjlaemhyUg/ZaxzzbDjLzQe2ewmrTlxbMsfBoCPsP ZjrMF0H3H+7rgrz7KwYpX9aIAUCDCsQRRyDq4zoqv2zghWAlVqirldKqnJ2RowDecjAY2qy7ryR3n X2KkGvroF1OxFSQ6W7Lbh1LL2LZoPvvUphURCD1VoHuVS+kCjK1FfwJfd5UCI1NzYV0ypzUaWXfxv KrXYE60TH7WrdXtAJyvf+W0MIA2KKCM2cD4Yj3Fjhet1IX32eNGuth1oahOCktlrtV4UK4EdsuLbU cxkDfNGVMR9pMD/boqsQ==; 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 1jgXrs-0006WG-Rb; Wed, 03 Jun 2020 18:12:00 +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 1jgXkp-0004cF-Pg for linux-arm-kernel@lists.infradead.org; Wed, 03 Jun 2020 18:04:54 +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 0F7AE31B; Wed, 3 Jun 2020 11:04:42 -0700 (PDT) Received: from bogus (unknown [10.37.8.135]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id ECD343F305; Wed, 3 Jun 2020 11:04:38 -0700 (PDT) Date: Wed, 3 Jun 2020 19:04:35 +0100 From: Sudeep Holla To: Viresh Kumar Subject: Re: [RFC] dt-bindings: mailbox: add doorbell support to ARM MHU Message-ID: <20200603180435.GB23722@bogus> References: <0a50f0cf5593baeb628dc8606c523665e5e2ae6c.1589519600.git.viresh.kumar@linaro.org> <20200528192005.GA494874@bogus> <20200529040758.kneg2j4n3gxh2rfv@vireshk-i7> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200529040758.kneg2j4n3gxh2rfv@vireshk-i7> 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-20200603_110444_004813_33B3E187 X-CRM114-Status: GOOD ( 10.59 ) 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: Rob Herring , Arnd Bergmann , devicetree@vger.kernel.org, Jassi Brar , linux-kernel@vger.kernel.org, Bjorn Andersson , Sudeep Holla , Frank Rowand , 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, May 29, 2020 at 09:37:58AM +0530, Viresh Kumar wrote: > On 28-05-20, 13:20, Rob Herring wrote: > > Whether Linux > > requires serializing mailbox accesses is a separate issue. On that side, > > it seems silly to not allow driving the h/w in the most efficient way > > possible. > > That's exactly what we are trying to say. The hardware allows us to > write all 32 bits in parallel, without any hardware issues, why > shouldn't we do that ? The delay (which Sudeep will find out, he is > facing issues with hardware access because of lockdown right now) OK, I was able to access the setup today. I couldn't reach a point where I can do measurements as the system just became unusable with one physical channel instead of 2 virtual channels as in my patches. My test was simple. Switch to schedutil and read sensors periodically via sysfs. arm-scmi firmware:scmi: message for 1 is not expected! arm-scmi firmware:scmi: timed out in resp(caller: scmi_sensor_reading_get+0xf4/0x120) arm-scmi firmware:scmi: timed out in resp(caller: scmi_sensor_reading_get+0xf4/0x120) arm-scmi firmware:scmi: message for 1 is not expected! arm-scmi firmware:scmi: timed out in resp(caller: scmi_sensor_reading_get+0xf4/0x120) arm-scmi firmware:scmi: message for 1 is not expected! With trace enabled I can see even cpufreq_set timing out. Sample trace output: bash-1019 [005] 1149.452340: scmi_xfer_begin: transfer_id=1537 msg_id=7 protocol_id=19 seq=0 poll=1 bash-1019 [005] 1149.452407: scmi_xfer_end: transfer_id=1537 msg_id=7 protocol_id=19 seq=0 status=0 bash-1526 [000] 1149.472553: scmi_xfer_begin: transfer_id=1538 msg_id=6 protocol_id=21 seq=0 poll=0 -0 [001] 1149.472733: scmi_xfer_begin: transfer_id=1539 msg_id=7 protocol_id=19 seq=1 poll=1 -0 [001] 1149.472842: scmi_xfer_end: transfer_id=1539 msg_id=7 protocol_id=19 seq=1 status=-110 -0 [001] 1149.483040: scmi_xfer_begin: transfer_id=1540 msg_id=7 protocol_id=19 seq=1 poll=1 -0 [001] 1149.483043: scmi_xfer_end: transfer_id=1540 msg_id=7 protocol_id=19 seq=1 status=0 rs:main-543 [003] 1149.493031: scmi_xfer_begin: transfer_id=1541 msg_id=7 protocol_id=19 seq=1 poll=1 rs:main-543 [003] 1149.493047: scmi_xfer_end: transfer_id=1541 msg_id=7 protocol_id=19 seq=1 status=0 -0 [000] 1149.507033: scmi_xfer_begin: transfer_id=1542 msg_id=7 protocol_id=19 seq=1 poll=1 -0 [000] 1149.507044: scmi_xfer_end: transfer_id=1542 msg_id=7 protocol_id=19 seq=1 status=0 bash-1526 [000] 1149.516068: scmi_xfer_end: transfer_id=1538 msg_id=6 protocol_id=21 seq=0 status=-110 bash-1526 [000] 1149.516559: scmi_xfer_begin: transfer_id=1543 msg_id=6 protocol_id=21 seq=0 poll=0 -0 [001] 1149.516729: scmi_xfer_begin: transfer_id=1544 msg_id=7 protocol_id=19 seq=1 poll=1 -0 [001] 1149.516837: scmi_xfer_end: transfer_id=1544 msg_id=7 protocol_id=19 seq=1 status=-110 ksoftirqd/0-9 [000] 1149.519065: scmi_xfer_begin: transfer_id=1545 msg_id=7 protocol_id=19 seq=1 poll=1 ksoftirqd/0-9 [000] 1149.519072: scmi_xfer_end: transfer_id=1545 msg_id=7 protocol_id=19 seq=1 status=0 -0 [001] 1149.526878: scmi_xfer_begin: transfer_id=1546 msg_id=7 protocol_id=19 seq=1 poll=1 -0 [001] 1149.526882: scmi_xfer_end: transfer_id=1546 msg_id=7 protocol_id=19 seq=1 status=0 -0 [000] 1149.551119: scmi_xfer_begin: transfer_id=1547 msg_id=7 protocol_id=19 seq=1 poll=1 -0 [000] 1149.551138: scmi_xfer_end: transfer_id=1547 msg_id=7 protocol_id=19 seq=1 status=0 bash-1526 [000] 1149.560191: scmi_xfer_end: transfer_id=1543 msg_id=6 protocol_id=21 seq=0 status=-110 bash-1526 [000] 1149.560690: scmi_xfer_begin: transfer_id=1548 msg_id=6 protocol_id=21 seq=0 poll=0 -0 [001] 1149.560859: scmi_xfer_begin: transfer_id=1549 msg_id=7 protocol_id=19 seq=1 poll=1 -0 [001] 1149.560968: scmi_xfer_end: transfer_id=1549 msg_id=7 protocol_id=19 seq=1 status=-110 protocol_id=19 is cpufreq and 21 is sensor. This is simplest test and I can easily generate more timeouts starting some stress test with DVFS. -- Regards, Sudeep _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel