From patchwork Wed Sep 14 07:53:43 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Manivannan Sadhasivam X-Patchwork-Id: 605837 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D267DC6FA8A for ; Wed, 14 Sep 2022 07:55:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230113AbiINHzJ (ORCPT ); Wed, 14 Sep 2022 03:55:09 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57182 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229975AbiINHym (ORCPT ); Wed, 14 Sep 2022 03:54:42 -0400 Received: from mail-pg1-x529.google.com (mail-pg1-x529.google.com [IPv6:2607:f8b0:4864:20::529]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4417E2189 for ; Wed, 14 Sep 2022 00:54:32 -0700 (PDT) Received: by mail-pg1-x529.google.com with SMTP id i19so10325203pgi.1 for ; Wed, 14 Sep 2022 00:54:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date; bh=BmOWU26gjLBIOonkKcZ0ILBj0OeiqDzaVAugyvdHpNQ=; b=ScM8Pi5xIEHRfZElpQvyLnPbEmuIDVDUfS64bTvorxQf3MQlJGCGSFwwhlTpQqXajY dEOnCFWcI8pMFn7nYJ7QR4JrW6WTQK9v5Nbyc/3pnDtdcmCOsDfe+LC+Ot5Olr/fQ/hW Ra9ZQceClL0Xh2ESP7pjfaGkI/Vo6aJHCOSIUi91jHDf5+7hDCP/CIYSPb7VwnU4j3J8 ALqMGXIk6bz7roWDxnyriH9XiqDPKxVbhoRFESq0VFhSIsInSok8Wepimlx/V7CyHLCK pyMmq+/37lUgTMduEQbKl6lIgwxdrRo6YCIF+qhiN7iwR9xf3IRF+Q8ILzSguc6ET2WB 1yuQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date; bh=BmOWU26gjLBIOonkKcZ0ILBj0OeiqDzaVAugyvdHpNQ=; b=xbpnu+C/y6d1sbOx909zHd1aG6OiThiKXvN19lQ6voa8c1zR1/N5rvHXX8iHZd20Jk WuO1Gnz1LLrRCSAXeATqw1BXwaMg35aQdFKYk2ZeOxgEJxxuJgccMZ0gyWQH+B3rDTh1 3WF1r9tcslXbmZ1eMrF4oljMj9dCq6MZLxBgYi3yn4qf42oX2QnJ7Z0lgJds96eO4C6o XLmJxMKn0gj4bLzGEt2nZAqTOfR6miFllssMuLyy4EYpwHWbrlGeG1nJcaUp6aa55frS fkSUdna9g83L1PsJzjtxd28GUgsm9x4B1xIdX2XWMJCeA2ewye75id6sNItmgoqg3kr0 9VhA== X-Gm-Message-State: ACgBeo06Mc15VEaIqrOqHnhIhtPc3jneFa5vc2f350uD/eYjqM5sD90S St0SUXsS4jSI3+1qurGKdv/Q X-Google-Smtp-Source: AA6agR7J9lOpcH4DAcMCYZmGgbbWz6EuCww8Cg5abiUxwkNkJP96/s3sSYcJ793K0ntpPo/MN8xAmg== X-Received: by 2002:a63:847:0:b0:439:22e4:8e49 with SMTP id 68-20020a630847000000b0043922e48e49mr8965145pgi.165.1663142071017; Wed, 14 Sep 2022 00:54:31 -0700 (PDT) Received: from localhost.localdomain ([117.202.184.122]) by smtp.gmail.com with ESMTPSA id p8-20020a1709027ec800b00174ea015ee2sm10119054plb.38.2022.09.14.00.54.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 14 Sep 2022 00:54:30 -0700 (PDT) From: Manivannan Sadhasivam To: lpieralisi@kernel.org, robh@kernel.org, andersson@kernel.org Cc: kw@linux.com, bhelgaas@google.com, linux-pci@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, konrad.dybcio@somainline.org, robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, devicetree@vger.kernel.org, dmitry.baryshkov@linaro.org, Manivannan Sadhasivam Subject: [PATCH v4 05/12] PCI: qcom-ep: Expose link transition counts via debugfs Date: Wed, 14 Sep 2022 13:23:43 +0530 Message-Id: <20220914075350.7992-6-manivannan.sadhasivam@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220914075350.7992-1-manivannan.sadhasivam@linaro.org> References: <20220914075350.7992-1-manivannan.sadhasivam@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Qualcomm PCIe controllers have debug registers in the MMIO region that count PCIe link transitions. Expose them over debugfs to userspace to help debug the low power issues. Signed-off-by: Manivannan Sadhasivam --- drivers/pci/controller/dwc/pcie-qcom-ep.c | 60 +++++++++++++++++++++++ 1 file changed, 60 insertions(+) diff --git a/drivers/pci/controller/dwc/pcie-qcom-ep.c b/drivers/pci/controller/dwc/pcie-qcom-ep.c index 72eb6cacdb3a..2dc6d4e44aff 100644 --- a/drivers/pci/controller/dwc/pcie-qcom-ep.c +++ b/drivers/pci/controller/dwc/pcie-qcom-ep.c @@ -10,6 +10,7 @@ */ #include +#include #include #include #include @@ -45,6 +46,11 @@ #define PARF_ATU_BASE_ADDR 0x634 #define PARF_ATU_BASE_ADDR_HI 0x638 #define PARF_SRIS_MODE 0x644 +#define PARF_DEBUG_CNT_PM_LINKST_IN_L2 0xc04 +#define PARF_DEBUG_CNT_PM_LINKST_IN_L1 0xc0c +#define PARF_DEBUG_CNT_PM_LINKST_IN_L0S 0xc10 +#define PARF_DEBUG_CNT_AUX_CLK_IN_L1SUB_L1 0xc84 +#define PARF_DEBUG_CNT_AUX_CLK_IN_L1SUB_L2 0xc88 #define PARF_DEVICE_TYPE 0x1000 #define PARF_BDF_TO_SID_CFG 0x2c00 @@ -135,12 +141,14 @@ enum qcom_pcie_ep_link_status { * @pci: Designware PCIe controller struct * @parf: Qualcomm PCIe specific PARF register base * @elbi: Designware PCIe specific ELBI register base + * @mmio: MMIO register base * @perst_map: PERST regmap * @mmio_res: MMIO region resource * @core_reset: PCIe Endpoint core reset * @reset: PERST# GPIO * @wake: WAKE# GPIO * @phy: PHY controller block + * @debugfs: PCIe Endpoint Debugfs directory * @clks: PCIe clocks * @num_clks: PCIe clocks count * @perst_en: Flag for PERST enable @@ -154,6 +162,7 @@ struct qcom_pcie_ep { void __iomem *parf; void __iomem *elbi; + void __iomem *mmio; struct regmap *perst_map; struct resource *mmio_res; @@ -161,6 +170,7 @@ struct qcom_pcie_ep { struct gpio_desc *reset; struct gpio_desc *wake; struct phy *phy; + struct dentry *debugfs; struct clk_bulk_data *clks; int num_clks; @@ -446,6 +456,9 @@ static int qcom_pcie_ep_get_io_resources(struct platform_device *pdev, pcie_ep->mmio_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mmio"); + pcie_ep->mmio = devm_pci_remap_cfg_resource(dev, pcie_ep->mmio_res); + if (IS_ERR(pcie_ep->mmio)) + return PTR_ERR(pcie_ep->mmio); syscon = of_parse_phandle(dev->of_node, "qcom,perst-regs", 0); if (!syscon) { @@ -629,6 +642,37 @@ static int qcom_pcie_ep_raise_irq(struct dw_pcie_ep *ep, u8 func_no, } } +static int qcom_pcie_ep_link_transition_count(struct seq_file *s, void *data) +{ + struct qcom_pcie_ep *pcie_ep = (struct qcom_pcie_ep *) + dev_get_drvdata(s->private); + + seq_printf(s, "L0s transition count: %u\n", + readl_relaxed(pcie_ep->mmio + PARF_DEBUG_CNT_PM_LINKST_IN_L0S)); + + seq_printf(s, "L1 transition count: %u\n", + readl_relaxed(pcie_ep->mmio + PARF_DEBUG_CNT_PM_LINKST_IN_L1)); + + seq_printf(s, "L1.1 transition count: %u\n", + readl_relaxed(pcie_ep->mmio + PARF_DEBUG_CNT_AUX_CLK_IN_L1SUB_L1)); + + seq_printf(s, "L1.2 transition count: %u\n", + readl_relaxed(pcie_ep->mmio + PARF_DEBUG_CNT_AUX_CLK_IN_L1SUB_L2)); + + seq_printf(s, "L2 transition count: %u\n", + readl_relaxed(pcie_ep->mmio + PARF_DEBUG_CNT_PM_LINKST_IN_L2)); + + return 0; +} + +static void qcom_pcie_ep_init_debugfs(struct qcom_pcie_ep *pcie_ep) +{ + struct dw_pcie *pci = &pcie_ep->pci; + + debugfs_create_devm_seqfile(pci->dev, "link_transition_count", pcie_ep->debugfs, + qcom_pcie_ep_link_transition_count); +} + static const struct pci_epc_features qcom_pcie_epc_features = { .linkup_notifier = true, .core_init_notifier = true, @@ -661,6 +705,7 @@ static int qcom_pcie_ep_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct qcom_pcie_ep *pcie_ep; + char *name; int ret; pcie_ep = devm_kzalloc(dev, sizeof(*pcie_ep), GFP_KERNEL); @@ -686,8 +731,21 @@ static int qcom_pcie_ep_probe(struct platform_device *pdev) if (ret) goto err_disable_resources; + name = devm_kasprintf(dev, GFP_KERNEL, "%pOFP", dev->of_node); + if (!name) { + ret = -ENOMEM; + goto err_disable_irqs; + } + + pcie_ep->debugfs = debugfs_create_dir(name, NULL); + qcom_pcie_ep_init_debugfs(pcie_ep); + return 0; +err_disable_irqs: + disable_irq(pcie_ep->global_irq); + disable_irq(pcie_ep->perst_irq); + err_disable_resources: qcom_pcie_disable_resources(pcie_ep); @@ -701,6 +759,8 @@ static int qcom_pcie_ep_remove(struct platform_device *pdev) disable_irq(pcie_ep->global_irq); disable_irq(pcie_ep->perst_irq); + debugfs_remove_recursive(pcie_ep->debugfs); + if (pcie_ep->link_status == QCOM_PCIE_EP_LINK_DISABLED) return 0;