From patchwork Mon Jan 27 16:49:43 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Marcel Holtmann X-Patchwork-Id: 197415 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.7 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4CD00C2D0DB for ; Mon, 27 Jan 2020 16:49:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1FF42206A2 for ; Mon, 27 Jan 2020 16:49:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725897AbgA0Qtt (ORCPT ); Mon, 27 Jan 2020 11:49:49 -0500 Received: from coyote.holtmann.net ([212.227.132.17]:43391 "EHLO mail.holtmann.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725845AbgA0Qtt (ORCPT ); Mon, 27 Jan 2020 11:49:49 -0500 Received: from localhost.localdomain (p4FEFC5A7.dip0.t-ipconnect.de [79.239.197.167]) by mail.holtmann.org (Postfix) with ESMTPSA id 16DA5CECD4 for ; Mon, 27 Jan 2020 17:59:08 +0100 (CET) From: Marcel Holtmann To: linux-bluetooth@vger.kernel.org Subject: [RFC] Bluetooth: Add debugfs option to enable runtime debug statements Date: Mon, 27 Jan 2020 17:49:43 +0100 Message-Id: <20200127164943.220776-1-marcel@holtmann.org> X-Mailer: git-send-email 2.24.1 MIME-Version: 1.0 Sender: linux-bluetooth-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@vger.kernel.org Signed-off-by: Marcel Holtmann --- include/net/bluetooth/bluetooth.h | 10 ++++- net/bluetooth/Kconfig | 4 ++ net/bluetooth/af_bluetooth.c | 2 + net/bluetooth/lib.c | 69 +++++++++++++++++++++++++++++++ 4 files changed, 84 insertions(+), 1 deletion(-) diff --git a/include/net/bluetooth/bluetooth.h b/include/net/bluetooth/bluetooth.h index e42bb8e03c09..d32d1f401efb 100644 --- a/include/net/bluetooth/bluetooth.h +++ b/include/net/bluetooth/bluetooth.h @@ -129,6 +129,8 @@ void bt_warn(const char *fmt, ...); __printf(1, 2) void bt_err(const char *fmt, ...); __printf(1, 2) +void bt_dbg(const char *fmt, ...); +__printf(1, 2) void bt_warn_ratelimited(const char *fmt, ...); __printf(1, 2) void bt_err_ratelimited(const char *fmt, ...); @@ -136,7 +138,11 @@ void bt_err_ratelimited(const char *fmt, ...); #define BT_INFO(fmt, ...) bt_info(fmt "\n", ##__VA_ARGS__) #define BT_WARN(fmt, ...) bt_warn(fmt "\n", ##__VA_ARGS__) #define BT_ERR(fmt, ...) bt_err(fmt "\n", ##__VA_ARGS__) -#define BT_DBG(fmt, ...) pr_debug(fmt "\n", ##__VA_ARGS__) +#if IS_ENABLED(CONFIG_BT_DEBUGFS_OPTION) +#define BT_DBG(fmt, ...) bt_dbg(fmt "\n", ##__VA_ARGS__) +#else +#define BT_DBG(fmt, ...) pr_debug(mt "\n", ##__VA_ARGS__) +#endif #define bt_dev_info(hdev, fmt, ...) \ BT_INFO("%s: " fmt, (hdev)->name, ##__VA_ARGS__) @@ -393,6 +399,8 @@ void bt_procfs_cleanup(struct net *net, const char *name); extern struct dentry *bt_debugfs; +void bt_lib_debugfs_init(void); + int l2cap_init(void); void l2cap_exit(void); diff --git a/net/bluetooth/Kconfig b/net/bluetooth/Kconfig index 165148c7c4ce..64833640bf3d 100644 --- a/net/bluetooth/Kconfig +++ b/net/bluetooth/Kconfig @@ -128,4 +128,8 @@ config BT_DEBUGFS Provide extensive information about internal Bluetooth states in debugfs. +config BT_DEBUGFS_OPTION + bool + default y if BT_DEBUGFS && !DYNAMIC_DEBUG + source "drivers/bluetooth/Kconfig" diff --git a/net/bluetooth/af_bluetooth.c b/net/bluetooth/af_bluetooth.c index 3fd124927d4d..fa0cd665f32a 100644 --- a/net/bluetooth/af_bluetooth.c +++ b/net/bluetooth/af_bluetooth.c @@ -731,6 +731,8 @@ static int __init bt_init(void) bt_debugfs = debugfs_create_dir("bluetooth", NULL); + bt_lib_debugfs_init(); + bt_leds_init(); err = bt_sysfs_init(); diff --git a/net/bluetooth/lib.c b/net/bluetooth/lib.c index c09e0a3a0ed9..28cfc3fd8fbe 100644 --- a/net/bluetooth/lib.c +++ b/net/bluetooth/lib.c @@ -27,6 +27,7 @@ #define pr_fmt(fmt) "Bluetooth: " fmt #include +#include #include @@ -135,6 +136,55 @@ int bt_to_errno(__u16 code) } EXPORT_SYMBOL(bt_to_errno); +#ifdef CONFIG_BT_DEBUGFS_OPTION +static bool debug_enable; + +static ssize_t debug_enable_read(struct file *file, char __user *user_buf, + size_t count, loff_t *ppos) +{ + char buf[3]; + + buf[0] = debug_enable ? 'Y': 'N'; + buf[1] = '\n'; + buf[2] = '\0'; + return simple_read_from_buffer(user_buf, count, ppos, buf, 2); +} + +static ssize_t debug_enable_write(struct file *file, + const char __user *user_buf, + size_t count, loff_t *ppos) +{ + bool enable; + int err; + + err = kstrtobool_from_user(user_buf, count, &enable); + if (err) + return err; + + if (enable == debug_enable) + return -EALREADY; + + debug_enable = enable; + + return count; +} + +static const struct file_operations debug_enable_fops = { + .open = simple_open, + .read = debug_enable_read, + .write = debug_enable_write, + .llseek = default_llseek, +}; + +void bt_lib_debugfs_init(void) +{ + debugfs_create_file("debug_enable", 0644, bt_debugfs, NULL, + &debug_enable_fops); +} +#else +void bt_lib_debugfs_init(void); +#endif + void bt_info(const char *format, ...) { struct va_format vaf; @@ -183,6 +233,25 @@ void bt_err(const char *format, ...) } EXPORT_SYMBOL(bt_err); +void bt_dbg(const char *format, ...) +{ + struct va_format vaf; + va_list args; + + if (likely(!debug_enable)) + return; + + va_start(args, format); + + vaf.fmt = format; + vaf.va = &args; + + printk(KERN_DEBUG pr_fmt("%pV"), &vaf); + + va_end(args); +} +EXPORT_SYMBOL(bt_dbg); + void bt_warn_ratelimited(const char *format, ...) { struct va_format vaf;