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printk: Add function to return log buffer address and size 

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>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Vasant Hegde 2014-08-09 11:15:30 +05:30 committed by Benjamin Herrenschmidt
parent 3609e09fd8
commit 14c4000a88
2 changed files with 15 additions and 0 deletions
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3
include/linux/printk.h
View File

@ -10,6 +10,9 @@
extern const char linux_banner[]; extern const char linux_banner[];
extern const char linux_proc_banner[]; extern const char linux_proc_banner[];
extern char *log_buf_addr_get(void);
extern u32 log_buf_len_get(void);
static inline int printk_get_level(const char *buffer) static inline int printk_get_level(const char *buffer)
{ {
if (buffer[0] == KERN_SOH_ASCII && buffer[1]) { if (buffer[0] == KERN_SOH_ASCII && buffer[1]) {

12
kernel/printk/printk.c
View File

@ -272,6 +272,18 @@ static char __log_buf[__LOG_BUF_LEN] __aligned(LOG_ALIGN);
static char *log_buf = __log_buf; static char *log_buf = __log_buf;
static u32 log_buf_len = __LOG_BUF_LEN; static u32 log_buf_len = __LOG_BUF_LEN;
/* Return log buffer address */
char *log_buf_addr_get(void)
{
return log_buf;
}
/* Return log buffer size */
u32 log_buf_len_get(void)
{
return log_buf_len;
}
/* human readable text of the record */ /* human readable text of the record */
static char *log_text(const struct printk_log *msg) static char *log_text(const struct printk_log *msg)
{ {