From patchwork Mon Apr 10 03:17:00 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shuai Xue X-Patchwork-Id: 13206092 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 AD13BC77B61 for ; Mon, 10 Apr 2023 03:18:40 +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=mGSXNT0uUOZCUnz3Kx2XGL8i/c7ZU8KO6MXNpXecTVo=; b=01n1/f4CI6Jg6o 4GmAVEeU6RQueGISD89cFNf/g1Jx9sXvBhUbkgX8v8CYPzOQ5/p3gQG2IEO+eVpUKED2lxiex8xXE iBGRAqBwVJY9/ufgohE31mfa4DuBCZApxzmCuBLWV82w7ZZvYDfIbm4uZRZkqhYtGcefRo3F2O3dS xXSQ/jOFacyZl3LTLuI+Qelbqc/bZdzI3xx8vsJ47e8lv5wzMZVC2QO5DfXCRXH9fizdNYUMSfAFC WsHvRGxFXaKNlBRbWLhno6He1SrB1g5LIOyzz1dOcczt3N9FeSCA/37E2RvkH/msm95rWTqQ2wIFi HwvlxeWxk0pyGsLJJpOA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1pli1x-00EUNk-1r; Mon, 10 Apr 2023 03:17:21 +0000 Received: from out30-119.freemail.mail.aliyun.com ([115.124.30.119]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1pli1t-00EULx-2G for linux-arm-kernel@lists.infradead.org; Mon, 10 Apr 2023 03:17:20 +0000 X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R231e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=ay29a033018046049;MF=xueshuai@linux.alibaba.com;NM=1;PH=DS;RN=13;SR=0;TI=SMTPD_---0VfeyoDh_1681096629; Received: from localhost.localdomain(mailfrom:xueshuai@linux.alibaba.com fp:SMTPD_---0VfeyoDh_1681096629) by smtp.aliyun-inc.com; Mon, 10 Apr 2023 11:17:10 +0800 From: Shuai Xue To: helgaas@kernel.org, yangyicong@huawei.com, will@kernel.org, Jonathan.Cameron@huawei.com Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, rdunlap@infradead.org, robin.murphy@arm.com, mark.rutland@arm.com, baolin.wang@linux.alibaba.com, zhuo.song@linux.alibaba.com, xueshuai@linux.alibaba.com Subject: [PATCH v2 1/3] docs: perf: Add description for Synopsys DesignWare PCIe PMU driver Date: Mon, 10 Apr 2023 11:17:00 +0800 Message-Id: <20230410031702.68355-2-xueshuai@linux.alibaba.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220917121036.14864-1-xueshuai@linux.alibaba.com> References: <20220917121036.14864-1-xueshuai@linux.alibaba.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230409_201717_923446_A724F889 X-CRM114-Status: GOOD ( 15.42 ) 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 Alibaba's T-Head Yitan 710 SoC is built on Synopsys' widely deployed and silicon-proven DesignWare Core PCIe controller which implements PMU for performance and functional debugging to facilitate system maintenance. Document it to provide guidance on how to use it. Signed-off-by: Shuai Xue --- .../admin-guide/perf/dwc_pcie_pmu.rst | 61 +++++++++++++++++++ Documentation/admin-guide/perf/index.rst | 1 + 2 files changed, 62 insertions(+) create mode 100644 Documentation/admin-guide/perf/dwc_pcie_pmu.rst diff --git a/Documentation/admin-guide/perf/dwc_pcie_pmu.rst b/Documentation/admin-guide/perf/dwc_pcie_pmu.rst new file mode 100644 index 000000000000..0672e959ebe4 --- /dev/null +++ b/Documentation/admin-guide/perf/dwc_pcie_pmu.rst @@ -0,0 +1,61 @@ +====================================================================== +Synopsys DesignWare Cores (DWC) PCIe Performance Monitoring Unit (PMU) +====================================================================== + +DesignWare Cores (DWC) PCIe PMU +=============================== + +To facilitate collection of statistics, Synopsys DesignWare Cores PCIe +controller provides the following two features: + +- Time Based Analysis (RX/TX data throughput and time spent in each + low-power LTSSM state) +- Lane Event counters (Error and Non-Error for lanes) + +The PMU is not a PCIe Root Complex integrated End Point (RCiEP) device but +only register counters provided by each PCIe Root Port. + +Time Based Analysis +------------------- + +Using this feature you can obtain information regarding RX/TX data +throughput and time spent in each low-power LTSSM state by the controller. + +The counters are 64-bit width and measure data in two categories, + +- percentage of time does the controller stay in LTSSM state in a + configurable duration. The measurement range of each Event in Group#0. +- amount of data processed (Units of 16 bytes). The measurement range of + each Event in Group#1. + +Lane Event counters +------------------- + +Using this feature you can obtain Error and Non-Error information in +specific lane by the controller. + +The counters are 32-bit width and the measured event is select by: + +- Group i +- Event j within the Group i +- and Lane k + +Some of the event counters only exist for specific configurations. + +DesignWare Cores (DWC) PCIe PMU Driver +======================================= + +This driver add PMU devices for each PCIe Root Port. And the PMU device is +named based the BDF of Root Port. For example, + + 30:03.0 PCI bridge: Device 1ded:8000 (rev 01) + +the PMU device name for this Root Port is dwc_rootport_3018. + +Example usage of counting PCIe RX TLP data payload (Units of 16 bytes):: + + $# perf stat -a -e dwc_rootport_3018/Rx_PCIe_TLP_Data_Payload/ + +average RX bandwidth can be calculated like this: + + PCIe TX Bandwidth = PCIE_TX_DATA * 16B / Measure_Time_Window diff --git a/Documentation/admin-guide/perf/index.rst b/Documentation/admin-guide/perf/index.rst index 9de64a40adab..11a80cd28a2e 100644 --- a/Documentation/admin-guide/perf/index.rst +++ b/Documentation/admin-guide/perf/index.rst @@ -19,5 +19,6 @@ Performance monitor support arm_dsu_pmu thunderx2-pmu alibaba_pmu + dwc_pcie_pmu nvidia-pmu meson-ddr-pmu