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pstore: Add persistent function tracing

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With this support kernel can save function call chain log into a
persistent ram buffer that can be decoded and dumped after reboot
through pstore filesystem. It can be used to determine what function
was last called before a reset or panic.

We store the log in a binary format and then decode it at read time.

p.s.
Mostly the code comes from trace_persistent.c driver found in the
Android git tree, written by Colin Cross <ccross@android.com>
(according to sign-off history). I reworked the driver a little bit,
and ported it to pstore.

Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Anton Vorontsov
2012-07-09 17:10:41 -07:00
committed by Greg Kroah-Hartman
parent 897dba0274
commit 060287b8c4
7 changed files with 208 additions and 5 deletions
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9
include/linux/pstore.h
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@@ -30,6 +30,7 @@ enum pstore_type_id {
PSTORE_TYPE_DMESG = 0,
PSTORE_TYPE_MCE = 1,
PSTORE_TYPE_CONSOLE = 2,
PSTORE_TYPE_FTRACE = 3,
PSTORE_TYPE_UNKNOWN = 255
};
@@ -57,6 +58,14 @@ struct pstore_info {
void *data;
};
#ifdef CONFIG_PSTORE_FTRACE
extern void pstore_ftrace_call(unsigned long ip, unsigned long parent_ip);
#else
static inline void pstore_ftrace_call(unsigned long ip, unsigned long parent_ip)
{ }
#endif
#ifdef CONFIG_PSTORE
extern int pstore_register(struct pstore_info *);
#else