From patchwork Tue Nov 19 05:19:08 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 179675 Delivered-To: patch@linaro.org Received: by 2002:a92:38d5:0:0:0:0:0 with SMTP id g82csp160552ilf; Mon, 18 Nov 2019 21:40:04 -0800 (PST) X-Google-Smtp-Source: APXvYqyLqfbK/xm8ZYQqeisSjtrQ3a4m0cgR4d8Blr8rfzaMbe40choooC5zhRvpOG4KUvZaGMLt X-Received: by 2002:a17:906:2518:: with SMTP id i24mr32673488ejb.4.1574142004655; Mon, 18 Nov 2019 21:40:04 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1574142004; cv=none; d=google.com; s=arc-20160816; b=xEgYNFssY4f3AHm1H+h9icHWzhoKH8ez2bTiN90K7JLDD0GxmjtfD9ui1LFs/o3PF7 U4hQThIcoKvR90nWBSM4bNKUIYazlCgMkTUbHdA0tQGsgWxfSz6d/vW58ezS/y890r8T KuLBFJuNFEG0sVUcXkmjxgGS8n4vObMjgmOdHJhjy6qmWZbUHYxQhRARb7Kdalb1xVCQ 8rgNEEzOSnOv6H0jXQHfyTR6cBb2NbT0IKFr0pwoFz3EejZkNHjadkjSb5MSZ/eqt7Ku UOyOkTH4n5PHb3FSN0e5orqbEVWsRn3hgepCSHBZlf0YBKTsjbaZjUaPqzC6CH3Jpulv YM6Q== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:content-transfer-encoding:mime-version :user-agent:references:in-reply-to:message-id:date:subject:cc:to :from:dkim-signature; bh=6bteJadvD5H1WuxKSIaui2Z3v8MPGNRWZyTE/Q4LtsE=; b=zJXXJJfNonZvymhm7Isu9usih37FExw3ZMqtwbCIa4OEkCMWfcpIt06zh58ekgRn61 o9iNsSw1vgLhdBr7pwtvUQzjM4g1OjAl2SZhEvl+v+Fvoo7p9cQFLpoGFDZbJQBMT05b 4kQwTbuknRd99q3nF3hQYDEjmvYxdfGbXcg65/2YI/WOYjoxbSqKKR3qxkmJpyL4JkOT umQwlBaCQO09tzUB490ejNVdpefXbz/a7hHD9rsmmnF4jfmwibptKpeM0uAeKi2svzn+ +kRxkpNFsNpU3wQTDFefQsfsvKf5VoT4HBBEp57+HKedpeL+gwlcjiIc76/egiKjEp/N bKSg== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@kernel.org header.s=default header.b=A8d3vyVD; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id b28si16247177edn.230.2019.11.18.21.40.04; Mon, 18 Nov 2019 21:40:04 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=default header.b=A8d3vyVD; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729693AbfKSFkC (ORCPT + 26 others); Tue, 19 Nov 2019 00:40:02 -0500 Received: from mail.kernel.org ([198.145.29.99]:34090 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728541AbfKSFkB (ORCPT ); Tue, 19 Nov 2019 00:40:01 -0500 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (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 D9ED2222ED; Tue, 19 Nov 2019 05:39:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1574142000; bh=Si7KddTlpBoJb+HqiYLW4wmn16wkQOtypJpyIXeDOJ4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=A8d3vyVDXWOU3wrteFjzbTVaBViyTIL86YfsL7bvwXkih9q3h7V3/mmTovaYSFrHt rnDnNlMDrACPmt8s7H4E+RbNnyntxlQ/XGNDvCNAEuSS4PaW9Bb1nTkZ/BddTqX9cd 8hXtBI0ANkgxJgzzicBjNSlR0Q6wFbF4OJKNSLv8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Mathieu Poirier , Suzuki K Poulose , Sasha Levin Subject: [PATCH 4.19 351/422] coresight: dynamic-replicator: Handle multiple connections Date: Tue, 19 Nov 2019 06:19:08 +0100 Message-Id: <20191119051421.760506688@linuxfoundation.org> X-Mailer: git-send-email 2.24.0 In-Reply-To: <20191119051400.261610025@linuxfoundation.org> References: <20191119051400.261610025@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Suzuki K Poulose [ Upstream commit 30af4fb619e5126cb3152072e687b377fc9398d6 ] When a replicator port is enabled, we block the traffic on the other port and route all traffic to the new enabled port. If there are two active trace sessions each targeting the two different paths from the replicator, the second session will disable the first session and route all the data to the second path. ETR / e.g, replicator \ ETB If CPU0 is operated in sysfs mode to ETR and CPU1 is operated in perf mode to ETB, depending on the order in which the replicator is enabled one device is blocked. Ideally we need trace-id for the session to make the right choice. That implies we need a trace-id allocation logic for the coresight subsystem and use that to route the traffic. The short term solution is to only manage the "target port" and leave the other port untouched. That leaves both the paths unaffected, except that some unwanted traffic may be pushed to the paths (if the Trace-IDs are not far enough), which is still fine and can be filtered out while processing rather than silently blocking the data. Cc: Mathieu Poirier Signed-off-by: Suzuki K Poulose Signed-off-by: Mathieu Poirier Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- .../coresight/coresight-dynamic-replicator.c | 64 ++++++++++++++----- 1 file changed, 47 insertions(+), 17 deletions(-) -- 2.20.1 diff --git a/drivers/hwtracing/coresight/coresight-dynamic-replicator.c b/drivers/hwtracing/coresight/coresight-dynamic-replicator.c index f6d0571ab9dd5..d31f1d8758b24 100644 --- a/drivers/hwtracing/coresight/coresight-dynamic-replicator.c +++ b/drivers/hwtracing/coresight/coresight-dynamic-replicator.c @@ -34,26 +34,42 @@ struct replicator_state { struct coresight_device *csdev; }; +/* + * replicator_reset : Reset the replicator configuration to sane values. + */ +static void replicator_reset(struct replicator_state *drvdata) +{ + CS_UNLOCK(drvdata->base); + + writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER0); + writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER1); + + CS_LOCK(drvdata->base); +} + static int replicator_enable(struct coresight_device *csdev, int inport, int outport) { + u32 reg; struct replicator_state *drvdata = dev_get_drvdata(csdev->dev.parent); + switch (outport) { + case 0: + reg = REPLICATOR_IDFILTER0; + break; + case 1: + reg = REPLICATOR_IDFILTER1; + break; + default: + WARN_ON(1); + return -EINVAL; + } + CS_UNLOCK(drvdata->base); - /* - * Ensure that the other port is disabled - * 0x00 - passing through the replicator unimpeded - * 0xff - disable (or impede) the flow of ATB data - */ - if (outport == 0) { - writel_relaxed(0x00, drvdata->base + REPLICATOR_IDFILTER0); - writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER1); - } else { - writel_relaxed(0x00, drvdata->base + REPLICATOR_IDFILTER1); - writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER0); - } + /* Ensure that the outport is enabled. */ + writel_relaxed(0x00, drvdata->base + reg); CS_LOCK(drvdata->base); dev_info(drvdata->dev, "REPLICATOR enabled\n"); @@ -63,15 +79,25 @@ static int replicator_enable(struct coresight_device *csdev, int inport, static void replicator_disable(struct coresight_device *csdev, int inport, int outport) { + u32 reg; struct replicator_state *drvdata = dev_get_drvdata(csdev->dev.parent); + switch (outport) { + case 0: + reg = REPLICATOR_IDFILTER0; + break; + case 1: + reg = REPLICATOR_IDFILTER1; + break; + default: + WARN_ON(1); + return; + } + CS_UNLOCK(drvdata->base); /* disable the flow of ATB data through port */ - if (outport == 0) - writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER0); - else - writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER1); + writel_relaxed(0xff, drvdata->base + reg); CS_LOCK(drvdata->base); @@ -156,7 +182,11 @@ static int replicator_probe(struct amba_device *adev, const struct amba_id *id) desc.groups = replicator_groups; drvdata->csdev = coresight_register(&desc); - return PTR_ERR_OR_ZERO(drvdata->csdev); + if (!IS_ERR(drvdata->csdev)) { + replicator_reset(drvdata); + return 0; + } + return PTR_ERR(drvdata->csdev); } #ifdef CONFIG_PM