From:   Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
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 <manivannan.sadhasivam@linaro.org>
Subject: [PATCH v3 18/19] PCI: qcom: Expose link transition counts via debugfs for v1.9.0 & v2.7.0
Date:   Fri, 10 Mar 2023 09:38:15 +0530
Message-Id: <20230310040816.22094-19-manivannan.sadhasivam@linaro.org>
In-Reply-To: <20230310040816.22094-1-manivannan.sadhasivam@linaro.org>
References: <20230310040816.22094-1-manivannan.sadhasivam@linaro.org>
MIME-Version: 1.0
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Qualcomm PCIe controllers of versions v1.9.0 and v2.7.0 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.

The debugfs interface is added using per config callback because the
register interface for accessing debug info varies between IP versions.

While at it, let's arrange the local variables in probe function to follow
reverse XMAS tree order.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
---
 drivers/pci/controller/dwc/pcie-qcom.c | 77 +++++++++++++++++++++++++-
 1 file changed, 75 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
index 52f09ee8dd48..f99b7e7f3f73 100644
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -10,6 +10,7 @@
 
 #include <linux/clk.h>
 #include <linux/crc8.h>
+#include <linux/debugfs.h>
 #include <linux/delay.h>
 #include <linux/gpio/consumer.h>
 #include <linux/interconnect.h>
@@ -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)
@@ -219,6 +227,7 @@ struct qcom_pcie_ops {
 	void (*deinit)(struct qcom_pcie *pcie);
 	void (*ltssm_enable)(struct qcom_pcie *pcie);
 	int (*config_sid)(struct qcom_pcie *pcie);
+	void (*init_debugfs)(struct qcom_pcie *pcie);
 };
 
 struct qcom_pcie_cfg {
@@ -229,11 +238,13 @@ 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)
@@ -263,6 +274,23 @@ static int qcom_pcie_start_link(struct dw_pcie *pci)
 	return 0;
 }
 
+static void qcom_pcie_init_debugfs(struct qcom_pcie *pcie,
+				   int (*debugfs_func)(struct seq_file *s, void *data))
+{
+	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(pci->dev, "link_transition_count",
+				    pcie->debugfs, debugfs_func);
+}
+
 static void qcom_pcie_2_1_0_ltssm_enable(struct qcom_pcie *pcie)
 {
 	u32 val;
@@ -963,6 +991,35 @@ static void qcom_pcie_deinit_2_7_0(struct qcom_pcie *pcie)
 	regulator_bulk_disable(ARRAY_SIZE(res->supplies), res->supplies);
 }
 
+static int qcom_pcie_debugfs_func_2_7_0(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_2_7_0(struct qcom_pcie *pcie)
+{
+	if (pcie->mhi)
+		qcom_pcie_init_debugfs(pcie, qcom_pcie_debugfs_func_2_7_0);
+}
+
 static int qcom_pcie_config_sid_1_9_0(struct qcom_pcie *pcie)
 {
 	/* iommu map structure */
@@ -1260,6 +1317,7 @@ static const struct qcom_pcie_ops ops_2_7_0 = {
 	.init = qcom_pcie_init_2_7_0,
 	.deinit = qcom_pcie_deinit_2_7_0,
 	.ltssm_enable = qcom_pcie_2_3_2_ltssm_enable,
+	.init_debugfs = qcom_pcie_init_debugfs_2_7_0,
 };
 
 /* Qcom IP rev.: 1.9.0 */
@@ -1269,6 +1327,7 @@ static const struct qcom_pcie_ops ops_1_9_0 = {
 	.deinit = qcom_pcie_deinit_2_7_0,
 	.ltssm_enable = qcom_pcie_2_3_2_ltssm_enable,
 	.config_sid = qcom_pcie_config_sid_1_9_0,
+	.init_debugfs = qcom_pcie_init_debugfs_2_7_0,
 };
 
 /* Qcom IP rev.: 2.9.0  Synopsys IP rev.: 5.00a */
@@ -1387,11 +1446,12 @@ static void qcom_pcie_icc_update(struct qcom_pcie *pcie)
 
 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);
@@ -1439,6 +1499,16 @@ 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);
@@ -1469,6 +1539,9 @@ static int qcom_pcie_probe(struct platform_device *pdev)
 
 	qcom_pcie_icc_update(pcie);
 
+	if (pcie->cfg->ops->init_debugfs)
+		pcie->cfg->ops->init_debugfs(pcie);
+
 	return 0;
 
 err_phy_exit:
-- 
2.25.1