From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from e28smtp08.in.ibm.com (e28smtp08.in.ibm.com [122.248.162.8]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 2BCF51A028F for ; Fri, 1 Aug 2014 01:36:04 +1000 (EST) Received: from /spool/local by e28smtp08.in.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Thu, 31 Jul 2014 21:05:55 +0530 Received: from d28av05.in.ibm.com (d28av05.in.ibm.com [9.184.220.67]) by d28relay01.in.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id s6VFZi4830867554 for ; Thu, 31 Jul 2014 21:05:44 +0530 Received: from d28av05.in.ibm.com (localhost [127.0.0.1]) by d28av05.in.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id s6VFZpsk018537 for ; Thu, 31 Jul 2014 21:05:51 +0530 Subject: [PATCH v2 1/2] printk: Add function to return log buffer address and size To: linux-kernel@vger.kernel.org From: Vasant Hegde Date: Thu, 31 Jul 2014 21:05:48 +0530 Message-ID: <20140731153447.27134.44225.stgit@hegdevasant.in.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Cc: Linus Torvalds , Andrew Morton , linuxppc-dev@lists.ozlabs.org List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Platforms like IBM Power Systems supports service processor assisted dump. It provides interface to add memory region to be captured when system is crashed. During initialization/running we can add kernel memory region to be collected. Presently we don't have a way to get the log buffer base address and size. This patch adds support to return log buffer address and size. Signed-off-by: Vasant Hegde --- Next patch extends arch specific code to add log buffer to platform dump. -Vasant include/linux/printk.h | 3 +++ kernel/printk/printk.c | 12 ++++++++++++ 2 files changed, 15 insertions(+) diff --git a/include/linux/printk.h b/include/linux/printk.h index 319ff7e..aae82c4 100644 --- a/include/linux/printk.h +++ b/include/linux/printk.h @@ -10,6 +10,9 @@ extern const char linux_banner[]; extern const char linux_proc_banner[]; +extern void *get_log_buf_addr(void); +extern u32 get_log_buf_len(void); + static inline int printk_get_level(const char *buffer) { if (buffer[0] == KERN_SOH_ASCII && buffer[1]) { diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c index 13e839d..4049f7b 100644 --- a/kernel/printk/printk.c +++ b/kernel/printk/printk.c @@ -270,6 +270,18 @@ static char __log_buf[__LOG_BUF_LEN] __aligned(LOG_ALIGN); static char *log_buf = __log_buf; static u32 log_buf_len = __LOG_BUF_LEN; +/* Return log buffer address */ +void *get_log_buf_addr(void) +{ + return log_buf; +} + +/* Return log buffer size */ +u32 get_log_buf_len(void) +{ + return log_buf_len; +} + /* human readable text of the record */ static char *log_text(const struct printk_log *msg) {