add dts config

hc

2023-12-06 08f87f769b595151be1afeff53e144f543faa614

 kernel/include/linux/kmsg_dump.h
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@@ -25,9 +25,20 @@
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 	KMSG_DUMP_PANIC,
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 	KMSG_DUMP_OOPS,
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 	KMSG_DUMP_EMERG,
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-	KMSG_DUMP_RESTART,
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-	KMSG_DUMP_HALT,
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-	KMSG_DUMP_POWEROFF,
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+	KMSG_DUMP_SHUTDOWN,
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+	KMSG_DUMP_MAX
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+};
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+
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+/**
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+ * struct kmsg_dumper_iter - iterator for kernel crash message dumper
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+ * @active:	Flag that specifies if this is currently dumping
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+ * @cur_seq:	Points to the oldest message to dump (private)
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+ * @next_seq:	Points after the newest message to dump (private)
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+ */
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+struct kmsg_dumper_iter {
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+	bool	active;
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+	u64	cur_seq;
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+	u64	next_seq;
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 };
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 /**
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@@ -40,66 +51,46 @@
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  */
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 struct kmsg_dumper {
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 	struct list_head list;
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-	void (*dump)(struct kmsg_dumper *dumper, enum kmsg_dump_reason reason);
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+	void (*dump)(struct kmsg_dumper *dumper, enum kmsg_dump_reason reason,
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+		     struct kmsg_dumper_iter *iter);
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 	enum kmsg_dump_reason max_reason;
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-	bool active;
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 	bool registered;
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-
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-	/* private state of the kmsg iterator */
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-	u32 cur_idx;
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-	u32 next_idx;
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-	u64 cur_seq;
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-	u64 next_seq;
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 };
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 #ifdef CONFIG_PRINTK
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 void kmsg_dump(enum kmsg_dump_reason reason);
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-bool kmsg_dump_get_line_nolock(struct kmsg_dumper *dumper, bool syslog,
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-			       char *line, size_t size, size_t *len);
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-
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-bool kmsg_dump_get_line(struct kmsg_dumper *dumper, bool syslog,
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+bool kmsg_dump_get_line(struct kmsg_dumper_iter *iter, bool syslog,
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 			char *line, size_t size, size_t *len);
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65
 
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-bool kmsg_dump_get_buffer(struct kmsg_dumper *dumper, bool syslog,
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-			  char *buf, size_t size, size_t *len);
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+bool kmsg_dump_get_buffer(struct kmsg_dumper_iter *iter, bool syslog,
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+			  char *buf, size_t size, size_t *len_out);
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-void kmsg_dump_rewind_nolock(struct kmsg_dumper *dumper);
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-
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-void kmsg_dump_rewind(struct kmsg_dumper *dumper);
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+void kmsg_dump_rewind(struct kmsg_dumper_iter *iter);
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 int kmsg_dump_register(struct kmsg_dumper *dumper);
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 int kmsg_dump_unregister(struct kmsg_dumper *dumper);
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+
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+const char *kmsg_dump_reason_str(enum kmsg_dump_reason reason);
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 #else
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 static inline void kmsg_dump(enum kmsg_dump_reason reason)
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 {
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 }
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-static inline bool kmsg_dump_get_line_nolock(struct kmsg_dumper *dumper,
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-					     bool syslog, const char *line,
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-					     size_t size, size_t *len)
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-{
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-	return false;
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-}
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-
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-static inline bool kmsg_dump_get_line(struct kmsg_dumper *dumper, bool syslog,
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+static inline bool kmsg_dump_get_line(struct kmsg_dumper_iter *iter, bool syslog,
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 				const char *line, size_t size, size_t *len)
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 {
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 	return false;
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 }
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-static inline bool kmsg_dump_get_buffer(struct kmsg_dumper *dumper, bool syslog,
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+static inline bool kmsg_dump_get_buffer(struct kmsg_dumper_iter *iter, bool syslog,
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 					char *buf, size_t size, size_t *len)
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 {
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 	return false;
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 }
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92
 
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-static inline void kmsg_dump_rewind_nolock(struct kmsg_dumper *dumper)
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-{
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-}
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-
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-static inline void kmsg_dump_rewind(struct kmsg_dumper *dumper)
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+static inline void kmsg_dump_rewind(struct kmsg_dumper_iter *iter)
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 {
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 }
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@@ -112,6 +103,11 @@
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 {
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 	return -EINVAL;
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 }
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+
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+static inline const char *kmsg_dump_reason_str(enum kmsg_dump_reason reason)
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+{
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+	return "Disabled";
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+}
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 #endif
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 #endif /* _LINUX_KMSG_DUMP_H */