From patchwork Wed Jun 28 02:19:28 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Krishna Chaitanya Chundru X-Patchwork-Id: 13295181 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 CA1D2C001DB for ; Wed, 28 Jun 2023 02:19:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230356AbjF1CTq (ORCPT ); Tue, 27 Jun 2023 22:19:46 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33150 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230473AbjF1CTp (ORCPT ); Tue, 27 Jun 2023 22:19:45 -0400 Received: from mx0b-0031df01.pphosted.com (mx0b-0031df01.pphosted.com [205.220.180.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8F7F41BE9; Tue, 27 Jun 2023 19:19:44 -0700 (PDT) Received: from pps.filterd (m0279871.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 35S1Qwxq020558; Wed, 28 Jun 2023 02:19:37 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; h=from : to : cc : subject : date : message-id : in-reply-to : references; s=qcppdkim1; bh=a/X1FFHaWN2vRp3imLzc9nrTHycORh/+rtRoKayrDF8=; b=czOQBtZFVkt5rnT/xetDrmeHk19jEtPxeRO3FYBy85Fk7lkP+DFQWcavWEJemR3A+zX5 XpxmaykDugh38OKxOgGks1yElc0SnQJNuj8mk/A/YQM4aobEWAwDci7y4M01ypJHcYbC Qm7f7zLT+rhDy66599GzLUfgCT2IuujbikMpSkSjyqNIWBGKudZ4Vtu7UaFt78+dtv// zWvDegAPn+1MGMZ4krW619Kd2YDFzhzq9feTCzm7fu3S6k5hmgYVj5WQJpAjO/bBHTNG MYUGW1XgBhWukdmz9MINyvgiUElnfHjvo37eyNVIkqMvNqXiv5850kYbQqnJyEWpNQCs qQ== Received: from apblrppmta01.qualcomm.com (blr-bdr-fw-01_GlobalNAT_AllZones-Outside.qualcomm.com [103.229.18.19]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3rfbfcc5je-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 28 Jun 2023 02:19:37 +0000 Received: from pps.filterd (APBLRPPMTA01.qualcomm.com [127.0.0.1]) by APBLRPPMTA01.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTP id 35S2JYB7023380; Wed, 28 Jun 2023 02:19:34 GMT Received: from pps.reinject (localhost [127.0.0.1]) by APBLRPPMTA01.qualcomm.com (PPS) with ESMTP id 3rdsjkqpkj-1; Wed, 28 Jun 2023 02:19:34 +0000 Received: from APBLRPPMTA01.qualcomm.com (APBLRPPMTA01.qualcomm.com [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 35S2JYBG023364; Wed, 28 Jun 2023 02:19:34 GMT Received: from hu-sgudaval-hyd.qualcomm.com (hu-krichai-hyd.qualcomm.com [10.213.110.112]) by APBLRPPMTA01.qualcomm.com (PPS) with ESMTP id 35S2JXrL023362; Wed, 28 Jun 2023 02:19:34 +0000 Received: by hu-sgudaval-hyd.qualcomm.com (Postfix, from userid 4058933) id 65D484AAD; Wed, 28 Jun 2023 07:49:33 +0530 (+0530) From: Krishna chaitanya chundru To: manivannan.sadhasivam@linaro.org Cc: helgaas@kernel.org, linux-pci@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, quic_vbadigan@quicinc.com, quic_nitegupt@quicinc.com, quic_skananth@quicinc.com, quic_ramkri@quicinc.com, krzysztof.kozlowski@linaro.org, Krishna chaitanya chundru , Manivannan Sadhasivam , Andy Gross , Bjorn Andersson , Konrad Dybcio , Bjorn Helgaas , Lorenzo Pieralisi , =?utf-8?q?Krzysztof_Wilczy=C5=84?= =?utf-8?q?ski?= , Rob Herring , Krzysztof Kozlowski , Conor Dooley , devicetree@vger.kernel.org (open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS) Subject: [PATCH v6 1/3] dt-bindings: PCI: qcom: ep: Add interconnects path Date: Wed, 28 Jun 2023 07:49:28 +0530 Message-Id: <1687918770-28416-2-git-send-email-quic_krichai@quicinc.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1687918770-28416-1-git-send-email-quic_krichai@quicinc.com> References: <1687918770-28416-1-git-send-email-quic_krichai@quicinc.com> X-QCInternal: smtphost X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-ORIG-GUID: e_IT5626rkkaFORRJGS3co2qZEJ95YBn X-Proofpoint-GUID: e_IT5626rkkaFORRJGS3co2qZEJ95YBn X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.957,Hydra:6.0.591,FMLib:17.11.176.26 definitions=2023-06-27_16,2023-06-27_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 spamscore=0 impostorscore=0 suspectscore=0 mlxscore=0 mlxlogscore=999 phishscore=0 clxscore=1015 bulkscore=0 lowpriorityscore=0 adultscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2305260000 definitions=main-2306280019 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Some platforms may not boot if a device driver doesn't initialize the interconnect path. Mostly it is handled by the bootloader but we have starting to see cases where bootloader simply ignores them. Add the "pcie-mem" interconnect path as a required property to the bindings. Signed-off-by: Krishna chaitanya chundru Acked-by: Manivannan Sadhasivam Reviewed-by: Krzysztof Kozlowski --- Documentation/devicetree/bindings/pci/qcom,pcie-ep.yaml | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/Documentation/devicetree/bindings/pci/qcom,pcie-ep.yaml b/Documentation/devicetree/bindings/pci/qcom,pcie-ep.yaml index 8111122..bc32e13 100644 --- a/Documentation/devicetree/bindings/pci/qcom,pcie-ep.yaml +++ b/Documentation/devicetree/bindings/pci/qcom,pcie-ep.yaml @@ -71,6 +71,13 @@ properties: description: GPIO used as WAKE# output signal maxItems: 1 + interconnects: + maxItems: 1 + + interconnect-names: + items: + - const: pcie-mem + resets: maxItems: 1 @@ -98,6 +105,8 @@ required: - interrupts - interrupt-names - reset-gpios + - interconnects + - interconnect-names - resets - reset-names - power-domains @@ -167,7 +176,9 @@ examples: - | #include #include + #include #include + pcie_ep: pcie-ep@1c00000 { compatible = "qcom,sdx55-pcie-ep"; reg = <0x01c00000 0x3000>, @@ -194,6 +205,8 @@ examples: interrupts = , ; interrupt-names = "global", "doorbell"; + interconnects = <&system_noc MASTER_PCIE &mc_virt SLAVE_EBI_CH0>; + interconnect-names = "pcie-mem"; reset-gpios = <&tlmm 57 GPIO_ACTIVE_LOW>; wake-gpios = <&tlmm 53 GPIO_ACTIVE_LOW>; resets = <&gcc GCC_PCIE_BCR>; From patchwork Wed Jun 28 02:19:29 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Krishna Chaitanya Chundru X-Patchwork-Id: 13295180 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 AAF73C001B1 for ; Wed, 28 Jun 2023 02:19:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230257AbjF1CTn (ORCPT ); Tue, 27 Jun 2023 22:19:43 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33140 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229716AbjF1CTm (ORCPT ); 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Wed, 28 Jun 2023 02:19:38 +0000 Received: from pps.filterd (APBLRPPMTA01.qualcomm.com [127.0.0.1]) by APBLRPPMTA01.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTP id 35S2JYcb023392; Wed, 28 Jun 2023 02:19:34 GMT Received: from pps.reinject (localhost [127.0.0.1]) by APBLRPPMTA01.qualcomm.com (PPS) with ESMTP id 3rdsjkqpkr-1; Wed, 28 Jun 2023 02:19:34 +0000 Received: from APBLRPPMTA01.qualcomm.com (APBLRPPMTA01.qualcomm.com [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 35S2JYlj023381; Wed, 28 Jun 2023 02:19:34 GMT Received: from hu-sgudaval-hyd.qualcomm.com (hu-krichai-hyd.qualcomm.com [10.213.110.112]) by APBLRPPMTA01.qualcomm.com (PPS) with ESMTP id 35S2JYhU023363; Wed, 28 Jun 2023 02:19:34 +0000 Received: by hu-sgudaval-hyd.qualcomm.com (Postfix, from userid 4058933) id 951D94AAF; Wed, 28 Jun 2023 07:49:33 +0530 (+0530) From: Krishna chaitanya chundru To: manivannan.sadhasivam@linaro.org Cc: helgaas@kernel.org, linux-pci@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, quic_vbadigan@quicinc.com, quic_nitegupt@quicinc.com, quic_skananth@quicinc.com, quic_ramkri@quicinc.com, krzysztof.kozlowski@linaro.org, Krishna chaitanya chundru , Andy Gross , Bjorn Andersson , Konrad Dybcio , Rob Herring , Krzysztof Kozlowski , Conor Dooley , devicetree@vger.kernel.org (open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS) Subject: [PATCH v6 2/3] arm: dts: qcom: sdx65: Add PCIe interconnect path Date: Wed, 28 Jun 2023 07:49:29 +0530 Message-Id: <1687918770-28416-3-git-send-email-quic_krichai@quicinc.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1687918770-28416-1-git-send-email-quic_krichai@quicinc.com> References: <1687918770-28416-1-git-send-email-quic_krichai@quicinc.com> X-QCInternal: smtphost X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-GUID: VA1hyiagNAtKuMG4WQzeF8GknFTsTZQO X-Proofpoint-ORIG-GUID: VA1hyiagNAtKuMG4WQzeF8GknFTsTZQO X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.957,Hydra:6.0.591,FMLib:17.11.176.26 definitions=2023-06-27_16,2023-06-27_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 spamscore=0 bulkscore=0 suspectscore=0 phishscore=0 mlxlogscore=876 adultscore=0 priorityscore=1501 clxscore=1015 malwarescore=0 mlxscore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2305260000 definitions=main-2306280019 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Add pcie-mem interconnect path to sdx65 platform. Signed-off-by: Krishna chaitanya chundru Reviewed-by: Manivannan Sadhasivam --- arch/arm/boot/dts/qcom/qcom-sdx65.dtsi | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/arm/boot/dts/qcom/qcom-sdx65.dtsi b/arch/arm/boot/dts/qcom/qcom-sdx65.dtsi index 1a35830..77fa97c 100644 --- a/arch/arm/boot/dts/qcom/qcom-sdx65.dtsi +++ b/arch/arm/boot/dts/qcom/qcom-sdx65.dtsi @@ -332,6 +332,9 @@ ; interrupt-names = "global", "doorbell"; + interconnects = <&system_noc MASTER_PCIE_0 &mc_virt SLAVE_EBI1>; + interconnect-names = "pcie-mem"; + resets = <&gcc GCC_PCIE_BCR>; reset-names = "core"; From patchwork Wed Jun 28 02:19:30 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Krishna Chaitanya Chundru X-Patchwork-Id: 13295182 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 9F139EB64DD for ; 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Wed, 28 Jun 2023 02:19:37 +0000 Received: from pps.filterd (APBLRPPMTA01.qualcomm.com [127.0.0.1]) by APBLRPPMTA01.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTP id 35S2JYLl023401; Wed, 28 Jun 2023 02:19:34 GMT Received: from pps.reinject (localhost [127.0.0.1]) by APBLRPPMTA01.qualcomm.com (PPS) with ESMTP id 3rdsjkqpku-1; Wed, 28 Jun 2023 02:19:34 +0000 Received: from APBLRPPMTA01.qualcomm.com (APBLRPPMTA01.qualcomm.com [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 35S2JYi4023365; Wed, 28 Jun 2023 02:19:34 GMT Received: from hu-sgudaval-hyd.qualcomm.com (hu-krichai-hyd.qualcomm.com [10.213.110.112]) by APBLRPPMTA01.qualcomm.com (PPS) with ESMTP id 35S2JYWm023378; Wed, 28 Jun 2023 02:19:34 +0000 Received: by hu-sgudaval-hyd.qualcomm.com (Postfix, from userid 4058933) id CAD9B4AB0; Wed, 28 Jun 2023 07:49:33 +0530 (+0530) From: Krishna chaitanya chundru To: manivannan.sadhasivam@linaro.org Cc: helgaas@kernel.org, linux-pci@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, quic_vbadigan@quicinc.com, quic_nitegupt@quicinc.com, quic_skananth@quicinc.com, quic_ramkri@quicinc.com, krzysztof.kozlowski@linaro.org, Krishna chaitanya chundru , Manivannan Sadhasivam , Lorenzo Pieralisi , =?utf-8?q?Krzysztof_Wilczy=C5=84?= =?utf-8?q?ski?= , Rob Herring , Bjorn Helgaas Subject: [PATCH v6 3/3] PCI: qcom-ep: Add ICC bandwidth voting support Date: Wed, 28 Jun 2023 07:49:30 +0530 Message-Id: <1687918770-28416-4-git-send-email-quic_krichai@quicinc.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1687918770-28416-1-git-send-email-quic_krichai@quicinc.com> References: <1687918770-28416-1-git-send-email-quic_krichai@quicinc.com> X-QCInternal: smtphost X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-ORIG-GUID: 4c_IRJWZn8azrW_71qhcIFw_Gsof8pWm X-Proofpoint-GUID: 4c_IRJWZn8azrW_71qhcIFw_Gsof8pWm X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.957,Hydra:6.0.591,FMLib:17.11.176.26 definitions=2023-06-27_16,2023-06-27_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 impostorscore=0 suspectscore=0 phishscore=0 mlxlogscore=999 lowpriorityscore=0 clxscore=1015 adultscore=0 mlxscore=0 bulkscore=0 spamscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2305260000 definitions=main-2306280019 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Add support to vote for ICC bandwidth based on the link speed and width. This patch is inspired from pcie-qcom driver to add basic interconnect support. Reference: commit c4860af88d0c ("PCI: qcom: Add basic interconnect support"). Signed-off-by: Krishna chaitanya chundru --- drivers/pci/controller/dwc/pcie-qcom-ep.c | 72 ++++++++++++++++++++++++++++++- 1 file changed, 71 insertions(+), 1 deletion(-) diff --git a/drivers/pci/controller/dwc/pcie-qcom-ep.c b/drivers/pci/controller/dwc/pcie-qcom-ep.c index 1435f51..b7d7038 100644 --- a/drivers/pci/controller/dwc/pcie-qcom-ep.c +++ b/drivers/pci/controller/dwc/pcie-qcom-ep.c @@ -13,6 +13,7 @@ #include #include #include +#include #include #include #include @@ -28,6 +29,7 @@ #define PARF_SYS_CTRL 0x00 #define PARF_DB_CTRL 0x10 #define PARF_PM_CTRL 0x20 +#define PARF_PM_STTS 0x24 #define PARF_MHI_CLOCK_RESET_CTRL 0x174 #define PARF_MHI_BASE_ADDR_LOWER 0x178 #define PARF_MHI_BASE_ADDR_UPPER 0x17c @@ -133,6 +135,11 @@ #define CORE_RESET_TIME_US_MAX 1005 #define WAKE_DELAY_US 2000 /* 2 ms */ +#define PCIE_GEN1_BW_MBPS 250 +#define PCIE_GEN2_BW_MBPS 500 +#define PCIE_GEN3_BW_MBPS 985 +#define PCIE_GEN4_BW_MBPS 1969 + #define to_pcie_ep(x) dev_get_drvdata((x)->dev) enum qcom_pcie_ep_link_status { @@ -178,6 +185,8 @@ struct qcom_pcie_ep { struct phy *phy; struct dentry *debugfs; + struct icc_path *icc_mem; + struct clk_bulk_data *clks; int num_clks; @@ -253,9 +262,50 @@ static void qcom_pcie_dw_stop_link(struct dw_pcie *pci) disable_irq(pcie_ep->perst_irq); } +static void qcom_pcie_ep_icc_update(struct qcom_pcie_ep *pcie_ep) +{ + struct dw_pcie *pci = &pcie_ep->pci; + u32 offset, status, bw; + int speed, width; + int ret; + + if (!pcie_ep->icc_mem) + return; + + offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP); + status = readw(pci->dbi_base + offset + PCI_EXP_LNKSTA); + + speed = FIELD_GET(PCI_EXP_LNKSTA_CLS, status); + width = FIELD_GET(PCI_EXP_LNKSTA_NLW, status); + + switch (speed) { + case 1: + bw = MBps_to_icc(PCIE_GEN1_BW_MBPS); + break; + case 2: + bw = MBps_to_icc(PCIE_GEN2_BW_MBPS); + break; + case 3: + bw = MBps_to_icc(PCIE_GEN3_BW_MBPS); + break; + default: + dev_warn(pci->dev, "using default GEN4 bandwidth\n"); + fallthrough; + case 4: + bw = MBps_to_icc(PCIE_GEN4_BW_MBPS); + break; + } + + ret = icc_set_bw(pcie_ep->icc_mem, 0, width * bw); + if (ret) + dev_err(pci->dev, "failed to set interconnect bandwidth: %d\n", + ret); +} + static int qcom_pcie_enable_resources(struct qcom_pcie_ep *pcie_ep) { int ret; + struct dw_pcie *pci = &pcie_ep->pci; ret = clk_bulk_prepare_enable(pcie_ep->num_clks, pcie_ep->clks); if (ret) @@ -277,8 +327,23 @@ static int qcom_pcie_enable_resources(struct qcom_pcie_ep *pcie_ep) if (ret) goto err_phy_exit; - return 0; + /* + * Some Qualcomm platforms require interconnect bandwidth constraints + * to be set before enabling interconnect clocks. + * + * Set an initial peak bandwidth corresponding to single-lane Gen 1 + * for the pcie-mem path. + */ + ret = icc_set_bw(pcie_ep->icc_mem, 0, MBps_to_icc(PCIE_GEN1_BW_MBPS)); + if (ret) { + dev_err(pci->dev, "failed to set interconnect bandwidth: %d\n", + ret); + goto err_phy_off; + } + return 0; +err_phy_off: + phy_power_off(pcie_ep->phy); err_phy_exit: phy_exit(pcie_ep->phy); err_disable_clk: @@ -550,6 +615,10 @@ static int qcom_pcie_ep_get_resources(struct platform_device *pdev, if (IS_ERR(pcie_ep->phy)) ret = PTR_ERR(pcie_ep->phy); + pcie_ep->icc_mem = devm_of_icc_get(dev, "pcie-mem"); + if (IS_ERR(pcie_ep->icc_mem)) + ret = PTR_ERR(pcie_ep->icc_mem); + return ret; } @@ -573,6 +642,7 @@ static irqreturn_t qcom_pcie_ep_global_irq_thread(int irq, void *data) } else if (FIELD_GET(PARF_INT_ALL_BME, status)) { dev_dbg(dev, "Received BME event. Link is enabled!\n"); pcie_ep->link_status = QCOM_PCIE_EP_LINK_ENABLED; + qcom_pcie_ep_icc_update(pcie_ep); pci_epc_bme_notify(pci->ep.epc); } else if (FIELD_GET(PARF_INT_ALL_PM_TURNOFF, status)) { dev_dbg(dev, "Received PM Turn-off event! Entering L23\n");