From patchwork Tue Jul 23 04:51:31 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Wu, Hao" X-Patchwork-Id: 11053799 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id B05B7112C for ; Tue, 23 Jul 2019 05:10:42 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 92765237F1 for ; Tue, 23 Jul 2019 05:10:42 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 81EC922B1F; Tue, 23 Jul 2019 05:10:42 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A452922B1F for ; Tue, 23 Jul 2019 05:10:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732854AbfGWFKg (ORCPT ); Tue, 23 Jul 2019 01:10:36 -0400 Received: from mga05.intel.com ([192.55.52.43]:1868 "EHLO mga05.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732842AbfGWFKM (ORCPT ); Tue, 23 Jul 2019 01:10:12 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga105.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 22 Jul 2019 22:10:11 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.64,297,1559545200"; d="scan'208";a="196992375" Received: from hao-dev.bj.intel.com ([10.238.157.65]) by fmsmga002.fm.intel.com with ESMTP; 22 Jul 2019 22:10:09 -0700 From: Wu Hao To: gregkh@linuxfoundation.org, mdf@kernel.org, linux-fpga@vger.kernel.org Cc: linux-kernel@vger.kernel.org, linux-api@vger.kernel.org, linux-doc@vger.kernel.org, atull@kernel.org, Wu Hao , Xu Yilun Subject: [PATCH v3 08/12] fpga: dfl: afu: add error reporting support. Date: Tue, 23 Jul 2019 12:51:31 +0800 Message-Id: <1563857495-26692-9-git-send-email-hao.wu@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1563857495-26692-1-git-send-email-hao.wu@intel.com> References: <1563857495-26692-1-git-send-email-hao.wu@intel.com> Sender: linux-fpga-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fpga@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Error reporting is one important private feature, it reports error detected on port and accelerated function unit (AFU). It introduces several sysfs interfaces to allow userspace to check and clear errors detected by hardware. Signed-off-by: Xu Yilun Signed-off-by: Wu Hao Acked-by: Alan Tull Signed-off-by: Moritz Fischer --- v2: switch to device_add/remove_group for sysfs. v3: update kernel version and date in sysfs doc --- Documentation/ABI/testing/sysfs-platform-dfl-port | 39 ++++ drivers/fpga/Makefile | 1 + drivers/fpga/dfl-afu-error.c | 225 ++++++++++++++++++++++ drivers/fpga/dfl-afu-main.c | 4 + drivers/fpga/dfl-afu.h | 4 + 5 files changed, 273 insertions(+) create mode 100644 drivers/fpga/dfl-afu-error.c diff --git a/Documentation/ABI/testing/sysfs-platform-dfl-port b/Documentation/ABI/testing/sysfs-platform-dfl-port index f641807..03740c2 100644 --- a/Documentation/ABI/testing/sysfs-platform-dfl-port +++ b/Documentation/ABI/testing/sysfs-platform-dfl-port @@ -79,3 +79,42 @@ KernelVersion: 5.4 Contact: Wu Hao Description: Read-only. Read this file to get the status of issued command to userclck_freqcntrcmd. + +What: /sys/bus/platform/devices/dfl-port.0/errors/revision +Date: July 2019 +KernelVersion: 5.4 +Contact: Wu Hao +Description: Read-only. Read this file to get the revision of this error + reporting private feature. + +What: /sys/bus/platform/devices/dfl-port.0/errors/errors +Date: July 2019 +KernelVersion: 5.4 +Contact: Wu Hao +Description: Read-only. Read this file to get errors detected on port and + Accelerated Function Unit (AFU). + +What: /sys/bus/platform/devices/dfl-port.0/errors/first_error +Date: July 2019 +KernelVersion: 5.4 +Contact: Wu Hao +Description: Read-only. Read this file to get the first error detected by + hardware. + +What: /sys/bus/platform/devices/dfl-port.0/errors/first_malformed_req +Date: July 2019 +KernelVersion: 5.4 +Contact: Wu Hao +Description: Read-only. Read this file to get the first malformed request + captured by hardware. + +What: /sys/bus/platform/devices/dfl-port.0/errors/clear +Date: July 2019 +KernelVersion: 5.4 +Contact: Wu Hao +Description: Write-only. Write error code to this file to clear errors. + Write fails with -EINVAL if input parsing fails or input error + code doesn't match. + Write fails with -EBUSY or -ETIMEDOUT if error can't be cleared + as hardware is in low power state (-EBUSY) or not responding + (-ETIMEDOUT). diff --git a/drivers/fpga/Makefile b/drivers/fpga/Makefile index 312b937..7255891 100644 --- a/drivers/fpga/Makefile +++ b/drivers/fpga/Makefile @@ -41,6 +41,7 @@ obj-$(CONFIG_FPGA_DFL_AFU) += dfl-afu.o dfl-fme-objs := dfl-fme-main.o dfl-fme-pr.o dfl-afu-objs := dfl-afu-main.o dfl-afu-region.o dfl-afu-dma-region.o +dfl-afu-objs += dfl-afu-error.o # Drivers for FPGAs which implement DFL obj-$(CONFIG_FPGA_DFL_PCI) += dfl-pci.o diff --git a/drivers/fpga/dfl-afu-error.c b/drivers/fpga/dfl-afu-error.c new file mode 100644 index 0000000..9649da8 --- /dev/null +++ b/drivers/fpga/dfl-afu-error.c @@ -0,0 +1,225 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Driver for FPGA Accelerated Function Unit (AFU) Error Reporting + * + * Copyright 2019 Intel Corporation, Inc. + * + * Authors: + * Wu Hao + * Xiao Guangrong + * Joseph Grecco + * Enno Luebbers + * Tim Whisonant + * Ananda Ravuri + * Mitchel Henry + */ + +#include + +#include "dfl-afu.h" + +#define PORT_ERROR_MASK 0x8 +#define PORT_ERROR 0x10 +#define PORT_FIRST_ERROR 0x18 +#define PORT_MALFORMED_REQ0 0x20 +#define PORT_MALFORMED_REQ1 0x28 + +#define ERROR_MASK GENMASK_ULL(63, 0) + +/* mask or unmask port errors by the error mask register. */ +static void __port_err_mask(struct device *dev, bool mask) +{ + void __iomem *base; + + base = dfl_get_feature_ioaddr_by_id(dev, PORT_FEATURE_ID_ERROR); + + writeq(mask ? ERROR_MASK : 0, base + PORT_ERROR_MASK); +} + +/* clear port errors. */ +static int __port_err_clear(struct device *dev, u64 err) +{ + struct platform_device *pdev = to_platform_device(dev); + void __iomem *base_err, *base_hdr; + int ret; + u64 v; + + base_err = dfl_get_feature_ioaddr_by_id(dev, PORT_FEATURE_ID_ERROR); + base_hdr = dfl_get_feature_ioaddr_by_id(dev, PORT_FEATURE_ID_HEADER); + + /* + * clear Port Errors + * + * - Check for AP6 State + * - Halt Port by keeping Port in reset + * - Set PORT Error mask to all 1 to mask errors + * - Clear all errors + * - Set Port mask to all 0 to enable errors + * - All errors start capturing new errors + * - Enable Port by pulling the port out of reset + */ + + /* if device is still in AP6 power state, can not clear any error. */ + v = readq(base_hdr + PORT_HDR_STS); + if (FIELD_GET(PORT_STS_PWR_STATE, v) == PORT_STS_PWR_STATE_AP6) { + dev_err(dev, "Could not clear errors, device in AP6 state.\n"); + return -EBUSY; + } + + /* Halt Port by keeping Port in reset */ + ret = __port_disable(pdev); + if (ret) + return ret; + + /* Mask all errors */ + __port_err_mask(dev, true); + + /* Clear errors if err input matches with current port errors.*/ + v = readq(base_err + PORT_ERROR); + + if (v == err) { + writeq(v, base_err + PORT_ERROR); + + v = readq(base_err + PORT_FIRST_ERROR); + writeq(v, base_err + PORT_FIRST_ERROR); + } else { + ret = -EINVAL; + } + + /* Clear mask */ + __port_err_mask(dev, false); + + /* Enable the Port by clear the reset */ + __port_enable(pdev); + + return ret; +} + +static ssize_t revision_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + void __iomem *base; + + base = dfl_get_feature_ioaddr_by_id(dev, PORT_FEATURE_ID_ERROR); + + return sprintf(buf, "%u\n", dfl_feature_revision(base)); +} +static DEVICE_ATTR_RO(revision); + +static ssize_t errors_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct dfl_feature_platform_data *pdata = dev_get_platdata(dev); + void __iomem *base; + u64 error; + + base = dfl_get_feature_ioaddr_by_id(dev, PORT_FEATURE_ID_ERROR); + + mutex_lock(&pdata->lock); + error = readq(base + PORT_ERROR); + mutex_unlock(&pdata->lock); + + return sprintf(buf, "0x%llx\n", (unsigned long long)error); +} +static DEVICE_ATTR_RO(errors); + +static ssize_t first_error_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct dfl_feature_platform_data *pdata = dev_get_platdata(dev); + void __iomem *base; + u64 error; + + base = dfl_get_feature_ioaddr_by_id(dev, PORT_FEATURE_ID_ERROR); + + mutex_lock(&pdata->lock); + error = readq(base + PORT_FIRST_ERROR); + mutex_unlock(&pdata->lock); + + return sprintf(buf, "0x%llx\n", (unsigned long long)error); +} +static DEVICE_ATTR_RO(first_error); + +static ssize_t first_malformed_req_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct dfl_feature_platform_data *pdata = dev_get_platdata(dev); + void __iomem *base; + u64 req0, req1; + + base = dfl_get_feature_ioaddr_by_id(dev, PORT_FEATURE_ID_ERROR); + + mutex_lock(&pdata->lock); + req0 = readq(base + PORT_MALFORMED_REQ0); + req1 = readq(base + PORT_MALFORMED_REQ1); + mutex_unlock(&pdata->lock); + + return sprintf(buf, "0x%016llx%016llx\n", + (unsigned long long)req1, (unsigned long long)req0); +} +static DEVICE_ATTR_RO(first_malformed_req); + +static ssize_t clear_store(struct device *dev, struct device_attribute *attr, + const char *buff, size_t count) +{ + struct dfl_feature_platform_data *pdata = dev_get_platdata(dev); + u64 value; + int ret; + + if (kstrtou64(buff, 0, &value)) + return -EINVAL; + + mutex_lock(&pdata->lock); + ret = __port_err_clear(dev, value); + mutex_unlock(&pdata->lock); + + return ret ? ret : count; +} +static DEVICE_ATTR_WO(clear); + +static struct attribute *port_err_attrs[] = { + &dev_attr_revision.attr, + &dev_attr_errors.attr, + &dev_attr_first_error.attr, + &dev_attr_first_malformed_req.attr, + &dev_attr_clear.attr, + NULL, +}; + +static struct attribute_group port_err_attr_group = { + .attrs = port_err_attrs, + .name = "errors", +}; + +static int port_err_init(struct platform_device *pdev, + struct dfl_feature *feature) +{ + struct dfl_feature_platform_data *pdata = dev_get_platdata(&pdev->dev); + + dev_dbg(&pdev->dev, "PORT ERR Init.\n"); + + mutex_lock(&pdata->lock); + __port_err_mask(&pdev->dev, false); + mutex_unlock(&pdata->lock); + + return device_add_group(&pdev->dev, &port_err_attr_group); +} + +static void port_err_uinit(struct platform_device *pdev, + struct dfl_feature *feature) +{ + dev_dbg(&pdev->dev, "PORT ERR UInit.\n"); + + device_remove_group(&pdev->dev, &port_err_attr_group); +} + +const struct dfl_feature_id port_err_id_table[] = { + {.id = PORT_FEATURE_ID_ERROR,}, + {0,} +}; + +const struct dfl_feature_ops port_err_ops = { + .init = port_err_init, + .uinit = port_err_uinit, +}; diff --git a/drivers/fpga/dfl-afu-main.c b/drivers/fpga/dfl-afu-main.c index 22d294b..15dd4cb 100644 --- a/drivers/fpga/dfl-afu-main.c +++ b/drivers/fpga/dfl-afu-main.c @@ -524,6 +524,10 @@ static void port_afu_uinit(struct platform_device *pdev, .ops = &port_afu_ops, }, { + .id_table = port_err_id_table, + .ops = &port_err_ops, + }, + { .ops = NULL, } }; diff --git a/drivers/fpga/dfl-afu.h b/drivers/fpga/dfl-afu.h index 35e60c5..c3182a2 100644 --- a/drivers/fpga/dfl-afu.h +++ b/drivers/fpga/dfl-afu.h @@ -100,4 +100,8 @@ int afu_dma_map_region(struct dfl_feature_platform_data *pdata, struct dfl_afu_dma_region * afu_dma_region_find(struct dfl_feature_platform_data *pdata, u64 iova, u64 size); + +extern const struct dfl_feature_ops port_err_ops; +extern const struct dfl_feature_id port_err_id_table[]; + #endif /* __DFL_AFU_H */