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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