From patchwork Wed Feb 9 10:56:57 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mao Jinlong X-Patchwork-Id: 12740089 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org 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 smtp.lore.kernel.org (Postfix) with ESMTPS id C6312C433EF for ; Wed, 9 Feb 2022 10:59:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:CC:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=FxDpFyf/iH0Mh6OIYkPvT6XWkh+oV6IEcVs/UiOvyxc=; b=L+AW7x+4u3AXwu 0enpf/e3PuroMyXgtb0ymJKJHAewc1tprKbjjC7sjpYPl6FSDJFCg0cDGhWz4ySJyjtjKPZPkxw6V pFAE3G5rxKa9n1Ep8Y1iwUZxV1npzD2AMDDq/JGzdhwKr/TnthGRGGg0T2PNCpjRaZ5GCbCvbLFcM LhTXBhbODS4lC6PnXbHLeCwM0+AVVNLe2UplE0IGwghrIcSKFlKprx2ELzRwUSs+hyoeBiUgtgwwP 2xU5Op1JVioQ7X+PWdeXNCecN72ZXjTcqL+F/2LOTQEwB74BPfhL2CVQpaqfFCOr0447KQvZAIEeT yvMxE2Dq/uuBIhmvLGbA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nHkfR-00HLTp-HJ; Wed, 09 Feb 2022 10:57:45 +0000 Received: from alexa-out-sd-02.qualcomm.com ([199.106.114.39]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nHkfJ-00HLRq-NG for linux-arm-kernel@lists.infradead.org; Wed, 09 Feb 2022 10:57:39 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; i=@quicinc.com; q=dns/txt; s=qcdkim; t=1644404257; x=1675940257; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version; bh=3kiFpI07EnzwZ5nN8FzjjtnDT53hUSR362ANVvAN0S0=; b=t2kqPyIdhMSpvvOlncAl7dmuiEmgl3iBr7LWk+0TURClKKV1a7DyPB/w c6ShEH0AfiPD3TmNqfKGMMis3iBuULpiDJGJAglk/82geECc0H6KaYFLe P6hm32iZcqPOCTn6hHuuXkSxcJznEpEA7pEWAQfp6RADYFGpbXBCCYV3s E=; Received: from unknown (HELO ironmsg04-sd.qualcomm.com) ([10.53.140.144]) by alexa-out-sd-02.qualcomm.com with ESMTP; 09 Feb 2022 02:57:35 -0800 X-QCInternal: smtphost Received: from nasanex01c.na.qualcomm.com ([10.47.97.222]) by ironmsg04-sd.qualcomm.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 Feb 2022 02:57:34 -0800 Received: from nalasex01a.na.qualcomm.com (10.47.209.196) by nasanex01c.na.qualcomm.com (10.47.97.222) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.922.19; Wed, 9 Feb 2022 02:57:33 -0800 Received: from jinlmao-gv.qualcomm.com (10.80.80.8) by nalasex01a.na.qualcomm.com (10.47.209.196) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.922.19; Wed, 9 Feb 2022 02:57:29 -0800 From: Mao Jinlong To: Mathieu Poirier , Suzuki K Poulose , Alexander Shishkin CC: Mao Jinlong , Mike Leach , Leo Yan , Greg Kroah-Hartman , , , , Tingwei Zhang , Yuanfang Zhang , Tao Zhang , Trilok Soni , Hao Zhang , Subject: [PATCH v3 01/10] Use IDR to maintain all the enabled sources' paths. Date: Wed, 9 Feb 2022 18:56:57 +0800 Message-ID: <20220209105706.18852-2-quic_jinlmao@quicinc.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220209105706.18852-1-quic_jinlmao@quicinc.com> References: <20220209105706.18852-1-quic_jinlmao@quicinc.com> MIME-Version: 1.0 X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01b.na.qualcomm.com (10.46.141.250) To nalasex01a.na.qualcomm.com (10.47.209.196) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220209_025737_837340_AC3C24C0 X-CRM114-Status: GOOD ( 23.00 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Use hash length of the source's device name to map to the pointer of the enabled path. Using IDR will be more efficient than using the list. And there could be other sources except STM and CPU etms in the new HWs. It is better to maintain all the paths together. Signed-off-by: Mao Jinlong --- drivers/hwtracing/coresight/coresight-core.c | 76 +++++++------------- 1 file changed, 27 insertions(+), 49 deletions(-) diff --git a/drivers/hwtracing/coresight/coresight-core.c b/drivers/hwtracing/coresight/coresight-core.c index 88653d1c06a4..a90097f88425 100644 --- a/drivers/hwtracing/coresight/coresight-core.c +++ b/drivers/hwtracing/coresight/coresight-core.c @@ -7,6 +7,7 @@ #include #include #include +#include #include #include #include @@ -26,6 +27,12 @@ static DEFINE_MUTEX(coresight_mutex); static DEFINE_PER_CPU(struct coresight_device *, csdev_sink); +/* + * Use IDR to map the hash length of the source's device name + * to the pointer of path for the source + */ +static DEFINE_IDR(path_idr); + /** * struct coresight_node - elements of a path, from source to sink * @csdev: Address of an element. @@ -36,20 +43,6 @@ struct coresight_node { struct list_head link; }; -/* - * When operating Coresight drivers from the sysFS interface, only a single - * path can exist from a tracer (associated to a CPU) to a sink. - */ -static DEFINE_PER_CPU(struct list_head *, tracer_path); - -/* - * As of this writing only a single STM can be found in CS topologies. Since - * there is no way to know if we'll ever see more and what kind of - * configuration they will enact, for the time being only define a single path - * for STM. - */ -static struct list_head *stm_path; - /* * When losing synchronisation a new barrier packet needs to be inserted at the * beginning of the data collected in a buffer. That way the decoder knows that @@ -1088,10 +1081,11 @@ static int coresight_validate_source(struct coresight_device *csdev, int coresight_enable(struct coresight_device *csdev) { - int cpu, ret = 0; + int ret = 0; struct coresight_device *sink; struct list_head *path; enum coresight_dev_subtype_source subtype; + u32 hash; subtype = csdev->subtype.source_subtype; @@ -1133,26 +1127,14 @@ int coresight_enable(struct coresight_device *csdev) if (ret) goto err_source; - switch (subtype) { - case CORESIGHT_DEV_SUBTYPE_SOURCE_PROC: - /* - * When working from sysFS it is important to keep track - * of the paths that were created so that they can be - * undone in 'coresight_disable()'. Since there can only - * be a single session per tracer (when working from sysFS) - * a per-cpu variable will do just fine. - */ - cpu = source_ops(csdev)->cpu_id(csdev); - per_cpu(tracer_path, cpu) = path; - break; - case CORESIGHT_DEV_SUBTYPE_SOURCE_SOFTWARE: - stm_path = path; - break; - default: - /* We can't be here */ - break; - } - + /* + * Use the hash length of source's device name as ID + * and map the ID to the pointer of the path. + */ + hash = hashlen_hash(hashlen_string(NULL, dev_name(&csdev->dev))); + ret = idr_alloc_u32(&path_idr, path, &hash, hash, GFP_KERNEL); + if (ret) + goto err_source; out: mutex_unlock(&coresight_mutex); return ret; @@ -1168,8 +1150,9 @@ EXPORT_SYMBOL_GPL(coresight_enable); void coresight_disable(struct coresight_device *csdev) { - int cpu, ret; + int ret; struct list_head *path = NULL; + u32 hash; mutex_lock(&coresight_mutex); @@ -1180,21 +1163,16 @@ void coresight_disable(struct coresight_device *csdev) if (!csdev->enable || !coresight_disable_source(csdev)) goto out; - switch (csdev->subtype.source_subtype) { - case CORESIGHT_DEV_SUBTYPE_SOURCE_PROC: - cpu = source_ops(csdev)->cpu_id(csdev); - path = per_cpu(tracer_path, cpu); - per_cpu(tracer_path, cpu) = NULL; - break; - case CORESIGHT_DEV_SUBTYPE_SOURCE_SOFTWARE: - path = stm_path; - stm_path = NULL; - break; - default: - /* We can't be here */ - break; + hash = hashlen_hash(hashlen_string(NULL, dev_name(&csdev->dev))); + /* Find the path by the hash length. */ + path = idr_find(&path_idr, hash); + if (path == NULL) { + dev_info(&csdev->dev, "Path is not found for %s\n", + dev_name(&csdev->dev)); + return; } + idr_remove(&path_idr, hash); coresight_disable_path(path); coresight_release_path(path);