From: Adrian Hunter <adrian.hun...@intel.com>
There are 2 debugfs files:
pstore/dump writing a kmsg dump reason code
will cause a dump to persistent
storage
pstore/panic writing anything will cause
a panic
Signed-off-by: Adrian Hunter <adrian.hun...@intel.com>
--
fs/pstore/platform.c | 51 ++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 51 insertions(+)
diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c
index c4ea778..9d65723 100644
-- a/fs/pstore/platform.c
++ b/fs/pstore/platform.c
@@ -33,6 +33,7 @@
#include <linux/hardirq.h>
#include <linux/jiffies.h>
#include <linux/workqueue.h>
#include <linux/debugfs.h>
#include "internal.h"
@@ -206,6 +207,54 @@ static int pstore_write_compat(enum pstore_type_id type,
return psi->write_buf(type, reason, id, part, psinfo->buf, size, psi);
}
#ifdef CONFIG_DEBUG_FS
static DEFINE_SPINLOCK(dbg_lock);
static int dbg_dump(void *data, u64 val)
{
unsigned long flags;
switch (val) {
case KMSG_DUMP_PANIC:
case KMSG_DUMP_OOPS:
case KMSG_DUMP_EMERG:
case KMSG_DUMP_RESTART:
case KMSG_DUMP_HALT:
case KMSG_DUMP_POWEROFF:
spin_lock_irqsave(&dbg_lock, flags);
kmsg_dump(val);
spin_unlock_irqrestore(&dbg_lock, flags);
return 0;
}
return -EINVAL;
}
DEFINE_SIMPLE_ATTRIBUTE(dbg_dump_fops, NULL, dbg_dump, "%llu\n");
static int dbg_panic(void *data, u64 val)
{
panic(KERN_EMERG "pstore debugging panic!\n");
return 0;
}
DEFINE_SIMPLE_ATTRIBUTE(dbg_panic_fops, NULL, dbg_panic, "%llu\n");
static void pstore_debugfs_init(void)
{
struct dentry *root;
root = debugfs_create_dir("pstore", NULL);
debugfs_create_file("dump", S_IWUSR, root, NULL, &dbg_dump_fops);
debugfs_create_file("panic", S_IWUSR, root, NULL, &dbg_panic_fops);
}
#else
static inline void pstore_debugfs_init(void)
{
}
#endif
/*
* platform specific persistent storage driver registers with
* us here. If pstore is already mounted, call the platform
@@ -257,6 +306,8 @@ int pstore_register(struct pstore_info *psi)
add_timer(&pstore_timer);
}
pstore_debugfs_init();
return 0;
}
EXPORT_SYMBOL_GPL(pstore_register);
-
1.7.9.5
--
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