Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / include / linux / kmsg_dump.h

diff --git a/kernel/include/linux/kmsg_dump.h b/kernel/include/linux/kmsg_dump.h
new file mode 100644 (file)
index 0000000..2e7a1e0
--- /dev/null
+++ b/kernel/include/linux/kmsg_dump.h
@@ -0,0 +1,117 @@
+/*
+ * linux/include/kmsg_dump.h
+ *
+ * Copyright (C) 2009 Net Insight AB
+ *
+ * Author: Simon Kagstrom <simon.kagstrom@netinsight.net>
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file COPYING in the main directory of this archive
+ * for more details.
+ */
+#ifndef _LINUX_KMSG_DUMP_H
+#define _LINUX_KMSG_DUMP_H
+
+#include <linux/errno.h>
+#include <linux/list.h>
+
+/*
+ * Keep this list arranged in rough order of priority. Anything listed after
+ * KMSG_DUMP_OOPS will not be logged by default unless printk.always_kmsg_dump
+ * is passed to the kernel.
+ */
+enum kmsg_dump_reason {
+       KMSG_DUMP_UNDEF,
+       KMSG_DUMP_PANIC,
+       KMSG_DUMP_OOPS,
+       KMSG_DUMP_EMERG,
+       KMSG_DUMP_RESTART,
+       KMSG_DUMP_HALT,
+       KMSG_DUMP_POWEROFF,
+};
+
+/**
+ * struct kmsg_dumper - kernel crash message dumper structure
+ * @list:      Entry in the dumper list (private)
+ * @dump:      Call into dumping code which will retrieve the data with
+ *             through the record iterator
+ * @max_reason:        filter for highest reason number that should be dumped
+ * @registered:        Flag that specifies if this is already registered
+ */
+struct kmsg_dumper {
+       struct list_head list;
+       void (*dump)(struct kmsg_dumper *dumper, enum kmsg_dump_reason reason);
+       enum kmsg_dump_reason max_reason;
+       bool active;
+       bool registered;
+
+       /* private state of the kmsg iterator */
+       u32 cur_idx;
+       u32 next_idx;
+       u64 cur_seq;
+       u64 next_seq;
+};
+
+#ifdef CONFIG_PRINTK
+void kmsg_dump(enum kmsg_dump_reason reason);
+
+bool kmsg_dump_get_line_nolock(struct kmsg_dumper *dumper, bool syslog,
+                              char *line, size_t size, size_t *len);
+
+bool kmsg_dump_get_line(struct kmsg_dumper *dumper, bool syslog,
+                       char *line, size_t size, size_t *len);
+
+bool kmsg_dump_get_buffer(struct kmsg_dumper *dumper, bool syslog,
+                         char *buf, size_t size, size_t *len);
+
+void kmsg_dump_rewind_nolock(struct kmsg_dumper *dumper);
+
+void kmsg_dump_rewind(struct kmsg_dumper *dumper);
+
+int kmsg_dump_register(struct kmsg_dumper *dumper);
+
+int kmsg_dump_unregister(struct kmsg_dumper *dumper);
+#else
+static inline void kmsg_dump(enum kmsg_dump_reason reason)
+{
+}
+
+static inline bool kmsg_dump_get_line_nolock(struct kmsg_dumper *dumper,
+                                            bool syslog, const char *line,
+                                            size_t size, size_t *len)
+{
+       return false;
+}
+
+static inline bool kmsg_dump_get_line(struct kmsg_dumper *dumper, bool syslog,
+                               const char *line, size_t size, size_t *len)
+{
+       return false;
+}
+
+static inline bool kmsg_dump_get_buffer(struct kmsg_dumper *dumper, bool syslog,
+                                       char *buf, size_t size, size_t *len)
+{
+       return false;
+}
+
+static inline void kmsg_dump_rewind_nolock(struct kmsg_dumper *dumper)
+{
+}
+
+static inline void kmsg_dump_rewind(struct kmsg_dumper *dumper)
+{
+}
+
+static inline int kmsg_dump_register(struct kmsg_dumper *dumper)
+{
+       return -EINVAL;
+}
+
+static inline int kmsg_dump_unregister(struct kmsg_dumper *dumper)
+{
+       return -EINVAL;
+}
+#endif
+
+#endif /* _LINUX_KMSG_DUMP_H */