From patchwork Thu Feb 14 03:48:17 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xiang Xiao X-Patchwork-Id: 10811703 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 AE0CB13A4 for ; Thu, 14 Feb 2019 03:48:42 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 98DF22DFD2 for ; Thu, 14 Feb 2019 03:48:42 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 888A72DFD6; Thu, 14 Feb 2019 03:48:42 +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=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FROM,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 EB6912DFD2 for ; Thu, 14 Feb 2019 03:48:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2395467AbfBNDsg (ORCPT ); Wed, 13 Feb 2019 22:48:36 -0500 Received: from mail-pg1-f195.google.com ([209.85.215.195]:41370 "EHLO mail-pg1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387562AbfBNDsg (ORCPT ); Wed, 13 Feb 2019 22:48:36 -0500 Received: by mail-pg1-f195.google.com with SMTP id m1so2296560pgq.8; Wed, 13 Feb 2019 19:48:35 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=x2IAgkervfuMLk7yMqPGZTbwjg3ZFYDfObRSN9ZzJXg=; b=IAPzk9WTHAFbDRLMwjdpRwHyRtkFGQSf/jbcncFxYL2IHeY+palCdlvAYwt3dmwQIL RLtR59lBEVKTYkvLrleJQocwlNMloRvawsQ2d3jjiRKFPnP8sT2UMYDXHmcTSDwCPA/f vDDuTgMRkxuq3Jo6RHKzeo0utbDXwZMv6ijoW6nKp7b0nQeoD57OUlhiG2sTX3xPhlJ7 IstoVqMduHVOI7JOanzzpojO0pD/UUUyE8bzPT27saiWMequlr1K0iifs8oDkJcJzMtm iCgJ3lS9Rxjw+BHSiaA+Hlztaupupap3z+w+PkgOaHDYMerrZ+NMvb+xTeg1sL8A9qTr QjoQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=x2IAgkervfuMLk7yMqPGZTbwjg3ZFYDfObRSN9ZzJXg=; b=bzuVzjb0JfyuyrRfANg1WpEFk5aIg4v6gyWGE9+J6f4MlbSCOoY2hLfONQGJXlk7ft 8z+14msUnFm4cH+z27zbM1q0otzW6QPH0eznMIH3aRwhjgb9VM3uDPqWohYWGGLVViuG Tvj1LFqYpKhbbtCuoty3Tx6h1FE/LWXbCRbyGbz4g3cs76Rw71DCcDDdxTPK9lSntski hzhStA6HMdW3A2JwImrS5rdiOMPKHZvtnJ5mbCT90FPTBGYgWldOY8UXaVXL0xRnfBqn cg1ArByyxwSJo5YTZL1n26VKlNA0POKUdP3x24cWTWcBVLFAFzrUg6Qkdd8bTqugyOeJ Dbhw== X-Gm-Message-State: AHQUAuawthVh4BxMiDIwGYVuWUoGsD8EdsPTpKkNBC72QXPDQ7sLuT1c XGpYH7s8VSqwYVWM4JuGeP4= X-Google-Smtp-Source: AHgI3IYLPMvHogKgywfCm8gDSZP5Kyhcz/FQuCK0Tf+gL3zDy9k4sDO2sDjA6dBIn9ezCU/0sGi/Xg== X-Received: by 2002:a63:2bcd:: with SMTP id r196mr1646748pgr.355.1550116114609; Wed, 13 Feb 2019 19:48:34 -0800 (PST) Received: from localhost.localdomain ([43.224.245.179]) by smtp.gmail.com with ESMTPSA id g7sm969962pfi.187.2019.02.13.19.48.31 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Wed, 13 Feb 2019 19:48:34 -0800 (PST) From: Xiang Xiao X-Google-Original-From: Xiang Xiao To: gregkh@linuxfoundation.org, alexander.shishkin@linux.intel.com, andriy.shevchenko@linux.intel.com, ohad@wizery.com, bjorn.andersson@linaro.org, wendy.liang@xilinx.com, arnaud.pouliquen@st.com, kumar.gala@linaro.org, linux-remoteproc@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Guiding Li Subject: [PATCH 2/2] rpmsg: add syslog redirection driver Date: Thu, 14 Feb 2019 11:48:17 +0800 Message-Id: <1550116097-29710-2-git-send-email-xiaoxiang@xiaomi.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1550116097-29710-1-git-send-email-xiaoxiang@xiaomi.com> References: <1550116097-29710-1-git-send-email-xiaoxiang@xiaomi.com> Sender: linux-remoteproc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-remoteproc@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Guiding Li This driver allows the remote processor redirect the output of syslog/printf into the kernel log, which is very useful to see what happen in the remote side. Signed-off-by: Guiding Li --- drivers/rpmsg/Kconfig | 12 ++++ drivers/rpmsg/Makefile | 1 + drivers/rpmsg/rpmsg_syslog.c | 163 +++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 176 insertions(+) create mode 100644 drivers/rpmsg/rpmsg_syslog.c diff --git a/drivers/rpmsg/Kconfig b/drivers/rpmsg/Kconfig index d0322b4..d701614 100644 --- a/drivers/rpmsg/Kconfig +++ b/drivers/rpmsg/Kconfig @@ -15,6 +15,18 @@ config RPMSG_CHAR in /dev. They make it possible for user-space programs to send and receive rpmsg packets. +config RPMSG_SYSLOG + tristate "RPMSG syslog redirection" + depends on RPMSG + help + Say Y here to redirect the syslog/printf from remote processor into + the kernel log which is very useful to see what happen in the remote + side. + + If the remote processor hang during bootup or panic at the runtime, + We can even cat /sys/kernel/debug/remoteproc/remoteprocX/trace0 to + get the last log which doesn't output yet. + config RPMSG_QCOM_GLINK_NATIVE tristate select RPMSG diff --git a/drivers/rpmsg/Makefile b/drivers/rpmsg/Makefile index 9aa8595..bfd22df 100644 --- a/drivers/rpmsg/Makefile +++ b/drivers/rpmsg/Makefile @@ -1,6 +1,7 @@ # SPDX-License-Identifier: GPL-2.0 obj-$(CONFIG_RPMSG) += rpmsg_core.o obj-$(CONFIG_RPMSG_CHAR) += rpmsg_char.o +obj-$(CONFIG_RPMSG_SYSLOG) += rpmsg_syslog.o obj-$(CONFIG_RPMSG_QCOM_GLINK_RPM) += qcom_glink_rpm.o obj-$(CONFIG_RPMSG_QCOM_GLINK_NATIVE) += qcom_glink_native.o obj-$(CONFIG_RPMSG_QCOM_GLINK_SMEM) += qcom_glink_smem.o diff --git a/drivers/rpmsg/rpmsg_syslog.c b/drivers/rpmsg/rpmsg_syslog.c new file mode 100644 index 0000000..b7a0d27 --- /dev/null +++ b/drivers/rpmsg/rpmsg_syslog.c @@ -0,0 +1,163 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2017 Pinecone Inc. + * + * redirect syslog/printf from remote to the kernel. + */ + +#include +#include +#include + +#define RPMSG_SYSLOG_TRANSFER 0 +#define RPMSG_SYSLOG_TRANSFER_DONE 1 +#define RPMSG_SYSLOG_SUSPEND 2 +#define RPMSG_SYSLOG_RESUME 3 + +struct rpmsg_syslog_header { + u32 command; + s32 result; +} __packed; + +struct rpmsg_syslog_transfer { + struct rpmsg_syslog_header header; + u32 count; + char data[0]; +} __packed; + +#define rpmsg_syslog_suspend rpmsg_syslog_header +#define rpmsg_syslog_resume rpmsg_syslog_header +#define rpmsg_syslog_transfer_done rpmsg_syslog_header + +struct rpmsg_syslog { + char *buf; + unsigned int next; + unsigned int size; +}; + +static int rpmsg_syslog_callback(struct rpmsg_device *rpdev, + void *data, int len, void *priv_, u32 src) +{ + struct rpmsg_syslog *priv = dev_get_drvdata(&rpdev->dev); + struct rpmsg_syslog_transfer *msg = data; + struct rpmsg_syslog_transfer_done done; + unsigned int copied = msg->count; + unsigned int printed = 0; + const char *nl; + + if (msg->header.command != RPMSG_SYSLOG_TRANSFER) + return -EINVAL; + + /* output the message before '\n' to the kernel log */ + nl = memrchr(msg->data, '\n', msg->count); + if (nl) { + printed = nl + 1 - msg->data; + copied = msg->count - printed; + + if (priv->next) { + pr_info("%.*s%.*s", priv->next, + priv->buf, printed, msg->data); + priv->next = 0; + } else { + pr_info("%.*s", printed, msg->data); + } + } + + /* append the message after '\n' to the buffer */ + if (copied != 0) { + unsigned int newsize = priv->next + copied; + + if (newsize > priv->size) { + char *newbuf; + + newbuf = krealloc(priv->buf, newsize, GFP_KERNEL); + if (newbuf) { + priv->buf = newbuf; + priv->size = newsize; + } else { + copied = priv->size - priv->next; + } + } + + strncpy(priv->buf + priv->next, msg->data + printed, copied); + priv->next += copied; + } + + done.command = RPMSG_SYSLOG_TRANSFER_DONE; + done.result = printed + copied; + return rpmsg_send(rpdev->ept, &done, sizeof(done)); +} + +static int rpmsg_syslog_probe(struct rpmsg_device *rpdev) +{ + struct rpmsg_syslog *priv; + + priv = devm_kzalloc(&rpdev->dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + dev_set_drvdata(&rpdev->dev, priv); + return 0; +} + +static void rpmsg_syslog_remove(struct rpmsg_device *rpdev) +{ + struct rpmsg_syslog *priv = dev_get_drvdata(&rpdev->dev); + + /* flush the buffered log if need */ + if (priv->next) + pr_info("%.*s\n", priv->next, priv->buf); + kfree(priv->buf); +} + +#ifdef CONFIG_PM_SLEEP +static int rpmsg_syslog_dev_suspend(struct device *dev) +{ + struct rpmsg_device *rpdev = dev_get_drvdata(dev); + struct rpmsg_syslog_suspend msg = { + .command = RPMSG_SYSLOG_SUSPEND, + }; + + return rpmsg_send(rpdev->ept, &msg, sizeof(msg)); +} + +static int rpmsg_syslog_dev_resume(struct device *dev) +{ + struct rpmsg_device *rpdev = dev_get_drvdata(dev); + struct rpmsg_syslog_resume msg = { + .command = RPMSG_SYSLOG_RESUME, + }; + + return rpmsg_send(rpdev->ept, &msg, sizeof(msg)); +} +#endif + +static SIMPLE_DEV_PM_OPS(rpmsg_syslog_pm, + rpmsg_syslog_dev_suspend, + rpmsg_syslog_dev_resume); + +static const struct rpmsg_device_id rpmsg_syslog_id_table[] = { + { .name = "rpmsg-syslog" }, + { }, +}; +MODULE_DEVICE_TABLE(rpmsg, rpmsg_syslog_id_table); + +static struct rpmsg_driver rpmsg_syslog_driver = { + .drv = { + .name = "rpmsg_syslog", + .owner = THIS_MODULE, + .pm = &rpmsg_syslog_pm, + }, + + .id_table = rpmsg_syslog_id_table, + .probe = rpmsg_syslog_probe, + .callback = rpmsg_syslog_callback, + .remove = rpmsg_syslog_remove, +}; + +module_rpmsg_driver(rpmsg_syslog_driver); + +MODULE_ALIAS("rpmsg:rpmsg_syslog"); +MODULE_AUTHOR("Guiding Li "); +MODULE_DESCRIPTION("rpmsg syslog redirection driver"); +MODULE_LICENSE("GPL v2");