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 6E4F8C47255 for ; Mon, 11 May 2020 14:17:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4492C206B7 for ; Mon, 11 May 2020 14:17:02 +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="adUozKzn" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730298AbgEKORB (ORCPT ); Mon, 11 May 2020 10:17:01 -0400 Received: from mail27.static.mailgun.info ([104.130.122.27]:14161 "EHLO mail27.static.mailgun.info" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730158AbgEKORB (ORCPT ); Mon, 11 May 2020 10:17:01 -0400 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1589206619; h=Message-ID: References: In-Reply-To: Subject: Cc: To: From: Date: Content-Transfer-Encoding: Content-Type: MIME-Version: Sender; bh=FVAth4pYBtTXQqicR7pFM3iw/uwUViT59NQhEjjdoQ8=; b=adUozKznWeg8+Y90HPjL8fICq86bogR4mOiHFtv0Asgzm9bBobgXVh7LopD8qejUcdtaO2PW 7MfHwZEPohVjimruaX4LIQ+UVKj3y4ojoUnb+Q+Tk50dqbrNHlVZmPLN8f2TiS/62StK21gp /lEjyDgpD5yUmD8Q2+f7i/9sHcM= X-Mailgun-Sending-Ip: 104.130.122.27 X-Mailgun-Sid: WyI1MzIzYiIsICJsaW51eC1hcm0tbXNtQHZnZXIua2VybmVsLm9yZyIsICJiZTllNGEiXQ== 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 5eb95e55.7f1bc9fd45a8-smtp-out-n05; Mon, 11 May 2020 14:16:53 -0000 (UTC) Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 9C9C3C432C2; Mon, 11 May 2020 14:16:52 +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: saiprakash.ranjan) by smtp.codeaurora.org (Postfix) with ESMTPSA id D992BC433F2; Mon, 11 May 2020 14:16:51 +0000 (UTC) MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Date: Mon, 11 May 2020 19:46:51 +0530 From: Sai Prakash Ranjan To: Mike Leach Cc: Suzuki K Poulose , Mathieu Poirier , Stephen Boyd , Linux Kernel Mailing List , linux-arm-msm@vger.kernel.org, linux-arm-kernel , Russell King Subject: Re: [PATCH] coresight: dynamic-replicator: Fix handling of multiple connections In-Reply-To: References: <20200426143725.18116-1-saiprakash.ranjan@codeaurora.org> <84918e7d-c933-3fa1-a61e-0615d4b3cf2c@arm.com> <668ea1283a6dd6b34e701972f6f71034@codeaurora.org> <5b0f5d77c4eec22d8048bb0ffa078345@codeaurora.org> <759d47de-2101-39cf-2f1c-cfefebebd548@arm.com> <7d343e96cf0701d91152fd14c2fdec42@codeaurora.org> Message-ID: <47f6d51bfad0a0bf1553e101e6a2c8c9@codeaurora.org> X-Sender: saiprakash.ranjan@codeaurora.org User-Agent: Roundcube Webmail/1.3.9 Sender: linux-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Hi Mike, On 2020-05-11 16:44, Mike Leach wrote: [...] >> >> I checked with the debug team and there is a limitation with >> the replicator(swao_replicator) in the AOSS group where it >> loses the idfilter register context when the clock is disabled. >> This is not just in SC7180 SoC but also reported on some latest >> upcoming QCOM SoCs as well and will need to be taken care in >> order to enable coresight on these chipsets. >> >> Here's what's happening - After the replicator is initialized, >> the clock is disabled in amba_pm_runtime_suspend() as a part of >> pm runtime workqueue with the assumption that there will be no >> loss of context after the replicator is initialized. But it doesn't >> hold good with the replicators with these unfortunate limitation >> and the idfilter register context is lost. >> >> [ 5.889406] amba_pm_runtime_suspend devname=6b06000.replicator >> ret=0 >> [ 5.914516] Workqueue: pm pm_runtime_work >> [ 5.918648] Call trace: >> [ 5.921185] dump_backtrace+0x0/0x1d0 >> [ 5.924958] show_stack+0x2c/0x38 >> [ 5.928382] dump_stack+0xc0/0x104 >> [ 5.931896] amba_pm_runtime_suspend+0xd8/0xe0 >> [ 5.936469] __rpm_callback+0xe0/0x140 >> [ 5.940332] rpm_callback+0x38/0x98 >> [ 5.943926] rpm_suspend+0xec/0x618 >> [ 5.947522] rpm_idle+0x5c/0x3f8 >> [ 5.950851] pm_runtime_work+0xa8/0xc0 >> [ 5.954718] process_one_work+0x1f8/0x4c0 >> [ 5.958848] worker_thread+0x50/0x468 >> [ 5.962623] kthread+0x12c/0x158 >> [ 5.965957] ret_from_fork+0x10/0x1c >> >> This is a platform/SoC specific replicator issue, so we can either >> introduce some DT property for replicators to identify which >> replicator >> has this limitation, check in replicator_enable() and reset the >> registers >> or have something like below diff to check the idfilter registers in >> replicator_enable() and then reset with clear comment specifying it’s >> the >> hardware limitation on some QCOM SoCs. Please let me know your >> thoughts >> on >> this? >> Sorry for hurrying up and sending the patch - https://lore.kernel.org/patchwork/patch/1239923/. I will send v2 based on further feedbacks here or there. > > 1) does this replicator part have a unique ID that differs from the > standard ARM designed replicators? > If so perhaps link the modification into this. (even if the part no in > PIDR0/1 is the same the UCI should be different for a different > implementation) > pid=0x2bb909 for both replicators. So part number is same. UCI will be different for different implementation(QCOM maybe different from ARM), but will it be different for different replicators under the same impl(i.e., on QCOM). > 2) We have used DT properties in the past - (e.g. scatter gather in > TMC) where hardware compatibility issues have impacted on the > operation of a coresight component. This is further complicated by the > fact that an ACPI property would be needed as well. > Yes, this was also one option which I had mentioned. But as you said we need to have an ACPI property as well and these systems with limitations are DT based. > 3) The sysfs access to FILTERID0/1 on this replicator is going to show > different values than on a standard replicator (0x00 instead of 0xFF). > Does this need to be addressed? > I don't think we need to change this because its actually showing the right values for the replicator. > 4 ) An alternative approach could be to model the driver on the ETM / > CTI drivers where the register values are held in the driver structure > and only applied on enable / disable. > This looks good to me since we really don't need to reset replicator in probe, we need to reset it only in replicator_enable() and that ensures clocks are enabled without having to assume things(from amba) about context being lost or not when clocks are disabled since that is implementation defined anyways. But, why can't we just move replicator_reset() from probe to replicator_enable()? Anything wrong with it? Seems like right thing to do because we will be having clocks enabled when we touch the replicator registers and only in the enable path. Thanks, Sai -- QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation 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=-0.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,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 7C305C54E8D for ; Mon, 11 May 2020 14:17:02 +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 528EC206DB for ; Mon, 11 May 2020 14:17:02 +0000 (UTC) Authentication-Results: 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(Authenticated sender: saiprakash.ranjan) by smtp.codeaurora.org (Postfix) with ESMTPSA id D992BC433F2; Mon, 11 May 2020 14:16:51 +0000 (UTC) MIME-Version: 1.0 Date: Mon, 11 May 2020 19:46:51 +0530 From: Sai Prakash Ranjan To: Mike Leach Subject: Re: [PATCH] coresight: dynamic-replicator: Fix handling of multiple connections In-Reply-To: References: <20200426143725.18116-1-saiprakash.ranjan@codeaurora.org> <84918e7d-c933-3fa1-a61e-0615d4b3cf2c@arm.com> <668ea1283a6dd6b34e701972f6f71034@codeaurora.org> <5b0f5d77c4eec22d8048bb0ffa078345@codeaurora.org> <759d47de-2101-39cf-2f1c-cfefebebd548@arm.com> <7d343e96cf0701d91152fd14c2fdec42@codeaurora.org> Message-ID: <47f6d51bfad0a0bf1553e101e6a2c8c9@codeaurora.org> X-Sender: saiprakash.ranjan@codeaurora.org User-Agent: Roundcube Webmail/1.3.9 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200511_071658_723723_45C5B7CA X-CRM114-Status: GOOD ( 24.35 ) X-BeenThere: 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