| Message ID | 20140731102920.27954.25076.stgit@hegdevasant.in.ibm.com (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
On Thu, 31 Jul 2014 16:00:06 +0530 Vasant Hegde <hegdevasant@linux.vnet.ibm.com> wrote: > 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. > > ... > > --- 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; > +} > + This is the v1 patch. The names are the same and get_log_buf_addr() still returns void*.
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) {
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(+)