From patchwork Thu Mar 16 08:11:17 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Manivannan Sadhasivam X-Patchwork-Id: 664199 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 A8432C6FD1F for ; Thu, 16 Mar 2023 08:14:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231264AbjCPIOL (ORCPT ); Thu, 16 Mar 2023 04:14:11 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60644 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231196AbjCPINY (ORCPT ); Thu, 16 Mar 2023 04:13:24 -0400 Received: from mail-pl1-x62e.google.com (mail-pl1-x62e.google.com [IPv6:2607:f8b0:4864:20::62e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B4F9FB4230 for ; Thu, 16 Mar 2023 01:12:57 -0700 (PDT) Received: by mail-pl1-x62e.google.com with SMTP id le6so865911plb.12 for ; Thu, 16 Mar 2023 01:12:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1678954377; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=2XfRU46h/LdNPZlNmzHa3o2bfWEEqqbeXYLd09w6/jk=; b=Q+p7maJ3CcszEhUPzBF+S8zKel0Cr+MJWS+wEy3YCu/qKWNSHcsPlkQEkjg1WJAJ9R cQs5M89L7wQ4pz4f3ygtSP6tTDl1A6Xbk7lpy0qzBR1K87zqhAT7A4tTSGNBYohMhbWO eKQILOX0e4nvf+AZ7ArmIr5qzFORbee28qcjPhGlGPGx3ICBRjj2+MlnLHPMP1+G2RMC nYS6KscYo+KG1ycHE+WTH3l9bWoZzvolDS7GBxifIk62sQnUnOUR64viEkPZNMTZ08ml RmipQiUmgcIbnsblDftgW0g2J+Uc2s/WKTlgW7cpavTIzCLzcurGkp8UTW2PvYbm/jS+ /ocA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1678954377; 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:message-id:reply-to; bh=2XfRU46h/LdNPZlNmzHa3o2bfWEEqqbeXYLd09w6/jk=; b=2rr86GnMtHP6FlF9PcKfUNij20rELBdGVsxVvBR2g50QutwIJF5iQ5D7j1zSiq7idN L+STeDxyRFMfriFrTIeS9hKaEqzSm1e8t3IU9DGtuyYp0GxS+VzZ3lckj8udtXCXfVPX 7fW2eiKBsYxtTA2luudS41ve2nNQEHYtGMywGbkvH7+/k1sqLGd+U1g8q00DmfuRyDgG 0YrRGodCugs7L66uUPqkOutEa/rYoH7I5ZagCeMYJqOCMHzVjY4hYK584dSkJ9dzdh83 KMyfPV6IWmZ/mTtD7DKHIEBOZc4cUISw0HTAQFg+SYPK2WrQzWL6+aRSsKhvy4SpHJI3 WQ9w== X-Gm-Message-State: AO0yUKVZPNPthAqv1hCAKFNR7dSmuMyqGlcv9pogB9tfff+/HWoBPxOH fkuNGa6Y87kjvCMXBA4NQvCd X-Google-Smtp-Source: AK7set9rShOagr4wGVhZzZQxx1Sv+ZpidxpOkxZ7c5l1ej/2LxvxmqL3DHaomGRW09MsbFQgnefXXQ== X-Received: by 2002:a05:6a20:b704:b0:d0:15c9:4e67 with SMTP id fg4-20020a056a20b70400b000d015c94e67mr2528810pzb.19.1678954377430; Thu, 16 Mar 2023 01:12:57 -0700 (PDT) Received: from localhost.localdomain ([117.207.30.24]) by smtp.gmail.com with ESMTPSA id 13-20020aa7910d000000b005d9984a947bsm4804422pfh.139.2023.03.16.01.12.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 16 Mar 2023 01:12:57 -0700 (PDT) From: Manivannan Sadhasivam To: andersson@kernel.org, lpieralisi@kernel.org, kw@linux.com, krzysztof.kozlowski+dt@linaro.org, robh@kernel.org Cc: konrad.dybcio@linaro.org, linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, quic_srichara@quicinc.com, Manivannan Sadhasivam Subject: [PATCH v5 19/19] PCI: qcom: Expose link transition counts via debugfs Date: Thu, 16 Mar 2023 13:41:17 +0530 Message-Id: <20230316081117.14288-20-manivannan.sadhasivam@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230316081117.14288-1-manivannan.sadhasivam@linaro.org> References: <20230316081117.14288-1-manivannan.sadhasivam@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org Qualcomm PCIe controllers have debug registers in the MHI region that count PCIe link transitions. Expose them over debugfs to userspace to help debug the low power issues. Note that even though the registers are prefixed as PARF_, they don't live under the "parf" register region. The register naming is following the Qualcomm's internal documentation as like other registers. While at it, let's arrange the local variables in probe function to follow reverse XMAS tree order. Signed-off-by: Manivannan Sadhasivam --- drivers/pci/controller/dwc/pcie-qcom.c | 65 +++++++++++++++++++++++++- 1 file changed, 63 insertions(+), 2 deletions(-) diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c index 7daff0421b86..f3e606b038c3 100644 --- a/drivers/pci/controller/dwc/pcie-qcom.c +++ b/drivers/pci/controller/dwc/pcie-qcom.c @@ -10,6 +10,7 @@ #include #include +#include #include #include #include @@ -62,6 +63,13 @@ #define AXI_MSTR_RESP_COMP_CTRL1 0x81c #define MISC_CONTROL_1_REG 0x8bc +/* MHI registers */ +#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 + /* PARF_SYS_CTRL register fields */ #define MAC_PHY_POWERDOWN_IN_P2_D_MUX_EN BIT(29) #define MST_WAKEUP_EN BIT(13) @@ -229,11 +237,13 @@ struct qcom_pcie { struct dw_pcie *pci; void __iomem *parf; /* DT parf */ void __iomem *elbi; /* DT elbi */ + void __iomem *mhi; union qcom_pcie_resources res; struct phy *phy; struct gpio_desc *reset; struct icc_path *icc_mem; const struct qcom_pcie_cfg *cfg; + struct dentry *debugfs; }; #define to_qcom_pcie(x) dev_get_drvdata((x)->dev) @@ -1382,13 +1392,51 @@ static void qcom_pcie_icc_update(struct qcom_pcie *pcie) } } +static int qcom_pcie_link_transition_count(struct seq_file *s, void *data) +{ + struct qcom_pcie *pcie = (struct qcom_pcie *)dev_get_drvdata(s->private); + + seq_printf(s, "L0s transition count: %u\n", + readl_relaxed(pcie->mhi + PARF_DEBUG_CNT_PM_LINKST_IN_L0S)); + + seq_printf(s, "L1 transition count: %u\n", + readl_relaxed(pcie->mhi + PARF_DEBUG_CNT_PM_LINKST_IN_L1)); + + seq_printf(s, "L1.1 transition count: %u\n", + readl_relaxed(pcie->mhi + PARF_DEBUG_CNT_AUX_CLK_IN_L1SUB_L1)); + + seq_printf(s, "L1.2 transition count: %u\n", + readl_relaxed(pcie->mhi + PARF_DEBUG_CNT_AUX_CLK_IN_L1SUB_L2)); + + seq_printf(s, "L2 transition count: %u\n", + readl_relaxed(pcie->mhi + PARF_DEBUG_CNT_PM_LINKST_IN_L2)); + + return 0; +} + +static void qcom_pcie_init_debugfs(struct qcom_pcie *pcie) +{ + struct dw_pcie *pci = pcie->pci; + struct device *dev = pci->dev; + char *name; + + name = devm_kasprintf(dev, GFP_KERNEL, "%pOFP", dev->of_node); + if (!name) + return; + + pcie->debugfs = debugfs_create_dir(name, NULL); + debugfs_create_devm_seqfile(dev, "link_transition_count", pcie->debugfs, + qcom_pcie_link_transition_count); +} + static int qcom_pcie_probe(struct platform_device *pdev) { + const struct qcom_pcie_cfg *pcie_cfg; struct device *dev = &pdev->dev; + struct qcom_pcie *pcie; struct dw_pcie_rp *pp; + struct resource *res; struct dw_pcie *pci; - struct qcom_pcie *pcie; - const struct qcom_pcie_cfg *pcie_cfg; int ret; pcie_cfg = of_device_get_match_data(dev); @@ -1436,6 +1484,16 @@ static int qcom_pcie_probe(struct platform_device *pdev) goto err_pm_runtime_put; } + /* MHI region is optional */ + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mhi"); + if (res) { + pcie->mhi = devm_ioremap_resource(dev, res); + if (IS_ERR(pcie->mhi)) { + ret = PTR_ERR(pcie->mhi); + goto err_pm_runtime_put; + } + } + pcie->phy = devm_phy_optional_get(dev, "pciephy"); if (IS_ERR(pcie->phy)) { ret = PTR_ERR(pcie->phy); @@ -1466,6 +1524,9 @@ static int qcom_pcie_probe(struct platform_device *pdev) qcom_pcie_icc_update(pcie); + if (pcie->mhi) + qcom_pcie_init_debugfs(pcie); + return 0; err_phy_exit: