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>

diff --git a/include/linux/printk.h b/include/linux/printk.h
index 0990997a5304bb13f798bd79cd96097eb17681e5..d78125f73ac4f9e3838c2449921bb69301c02261 100644 (file)
--- 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 char *log_buf_addr_get(void);
+extern u32 log_buf_len_get(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 de1a6bb6861db5e92f0884e2b733cb5b6988679e..e04c455a0e3860b2aa5784d4c2522a21300525e4 100644 (file)
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -272,6 +272,18 @@ 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 */
+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 */
 static char *log_text(const struct printk_log *msg)
 {