Messages in this thread Patch in this message | | | Subject | [PATCH v2 1/2] printk: Add function to return log buffer address and size | From | Vasant Hegde <> | Date | Thu, 31 Jul 2014 21:05:48 +0530 |
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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 <hegdevasant@linux.vnet.ibm.com>
--- 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) {
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