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printk: Add function to return log buffer address and size

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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>
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)
{ {