v4.19.13 snapshot.
diff --git a/arch/s390/include/asm/debug.h b/arch/s390/include/asm/debug.h
new file mode 100644
index 0000000..c305d39
--- /dev/null
+++ b/arch/s390/include/asm/debug.h
@@ -0,0 +1,270 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * S/390 debug facility
+ *
+ * Copyright IBM Corp. 1999, 2000
+ */
+#ifndef DEBUG_H
+#define DEBUG_H
+
+#include <linux/string.h>
+#include <linux/spinlock.h>
+#include <linux/kernel.h>
+#include <linux/time.h>
+#include <linux/refcount.h>
+#include <uapi/asm/debug.h>
+
+#define DEBUG_MAX_LEVEL 6 /* debug levels range from 0 to 6 */
+#define DEBUG_OFF_LEVEL -1 /* level where debug is switched off */
+#define DEBUG_FLUSH_ALL -1 /* parameter to flush all areas */
+#define DEBUG_MAX_VIEWS 10 /* max number of views in proc fs */
+#define DEBUG_MAX_NAME_LEN 64 /* max length for a debugfs file name */
+#define DEBUG_DEFAULT_LEVEL 3 /* initial debug level */
+
+#define DEBUG_DIR_ROOT "s390dbf" /* name of debug root directory in proc fs */
+
+#define DEBUG_DATA(entry) (char *)(entry + 1) /* data is stored behind */
+ /* the entry information */
+
+typedef struct __debug_entry debug_entry_t;
+
+struct debug_view;
+
+typedef struct debug_info {
+ struct debug_info *next;
+ struct debug_info *prev;
+ refcount_t ref_count;
+ spinlock_t lock;
+ int level;
+ int nr_areas;
+ int pages_per_area;
+ int buf_size;
+ int entry_size;
+ debug_entry_t ***areas;
+ int active_area;
+ int *active_pages;
+ int *active_entries;
+ struct dentry *debugfs_root_entry;
+ struct dentry *debugfs_entries[DEBUG_MAX_VIEWS];
+ struct debug_view *views[DEBUG_MAX_VIEWS];
+ char name[DEBUG_MAX_NAME_LEN];
+ umode_t mode;
+} debug_info_t;
+
+typedef int (debug_header_proc_t) (debug_info_t *id,
+ struct debug_view *view,
+ int area,
+ debug_entry_t *entry,
+ char *out_buf);
+
+typedef int (debug_format_proc_t) (debug_info_t *id,
+ struct debug_view *view, char *out_buf,
+ const char *in_buf);
+typedef int (debug_prolog_proc_t) (debug_info_t *id,
+ struct debug_view *view,
+ char *out_buf);
+typedef int (debug_input_proc_t) (debug_info_t *id,
+ struct debug_view *view,
+ struct file *file,
+ const char __user *user_buf,
+ size_t in_buf_size, loff_t *offset);
+
+int debug_dflt_header_fn(debug_info_t *id, struct debug_view *view,
+ int area, debug_entry_t *entry, char *out_buf);
+
+struct debug_view {
+ char name[DEBUG_MAX_NAME_LEN];
+ debug_prolog_proc_t *prolog_proc;
+ debug_header_proc_t *header_proc;
+ debug_format_proc_t *format_proc;
+ debug_input_proc_t *input_proc;
+ void *private_data;
+};
+
+extern struct debug_view debug_hex_ascii_view;
+extern struct debug_view debug_raw_view;
+extern struct debug_view debug_sprintf_view;
+
+/* do NOT use the _common functions */
+
+debug_entry_t *debug_event_common(debug_info_t *id, int level,
+ const void *data, int length);
+
+debug_entry_t *debug_exception_common(debug_info_t *id, int level,
+ const void *data, int length);
+
+/* Debug Feature API: */
+
+debug_info_t *debug_register(const char *name, int pages, int nr_areas,
+ int buf_size);
+
+debug_info_t *debug_register_mode(const char *name, int pages, int nr_areas,
+ int buf_size, umode_t mode, uid_t uid,
+ gid_t gid);
+
+void debug_unregister(debug_info_t *id);
+
+void debug_set_level(debug_info_t *id, int new_level);
+
+void debug_set_critical(void);
+void debug_stop_all(void);
+
+static inline bool debug_level_enabled(debug_info_t *id, int level)
+{
+ return level <= id->level;
+}
+
+static inline debug_entry_t *debug_event(debug_info_t *id, int level,
+ void *data, int length)
+{
+ if ((!id) || (level > id->level) || (id->pages_per_area == 0))
+ return NULL;
+ return debug_event_common(id, level, data, length);
+}
+
+static inline debug_entry_t *debug_int_event(debug_info_t *id, int level,
+ unsigned int tag)
+{
+ unsigned int t = tag;
+
+ if ((!id) || (level > id->level) || (id->pages_per_area == 0))
+ return NULL;
+ return debug_event_common(id, level, &t, sizeof(unsigned int));
+}
+
+static inline debug_entry_t *debug_long_event(debug_info_t *id, int level,
+ unsigned long tag)
+{
+ unsigned long t = tag;
+
+ if ((!id) || (level > id->level) || (id->pages_per_area == 0))
+ return NULL;
+ return debug_event_common(id, level, &t, sizeof(unsigned long));
+}
+
+static inline debug_entry_t *debug_text_event(debug_info_t *id, int level,
+ const char *txt)
+{
+ if ((!id) || (level > id->level) || (id->pages_per_area == 0))
+ return NULL;
+ return debug_event_common(id, level, txt, strlen(txt));
+}
+
+/*
+ * IMPORTANT: Use "%s" in sprintf format strings with care! Only pointers are
+ * stored in the s390dbf. See Documentation/s390/s390dbf.txt for more details!
+ */
+extern debug_entry_t *
+__debug_sprintf_event(debug_info_t *id, int level, char *string, ...)
+ __attribute__ ((format(printf, 3, 4)));
+
+#define debug_sprintf_event(_id, _level, _fmt, ...) \
+({ \
+ debug_entry_t *__ret; \
+ debug_info_t *__id = _id; \
+ int __level = _level; \
+ \
+ if ((!__id) || (__level > __id->level)) \
+ __ret = NULL; \
+ else \
+ __ret = __debug_sprintf_event(__id, __level, \
+ _fmt, ## __VA_ARGS__); \
+ __ret; \
+})
+
+static inline debug_entry_t *debug_exception(debug_info_t *id, int level,
+ void *data, int length)
+{
+ if ((!id) || (level > id->level) || (id->pages_per_area == 0))
+ return NULL;
+ return debug_exception_common(id, level, data, length);
+}
+
+static inline debug_entry_t *debug_int_exception(debug_info_t *id, int level,
+ unsigned int tag)
+{
+ unsigned int t = tag;
+
+ if ((!id) || (level > id->level) || (id->pages_per_area == 0))
+ return NULL;
+ return debug_exception_common(id, level, &t, sizeof(unsigned int));
+}
+
+static inline debug_entry_t *debug_long_exception (debug_info_t *id, int level,
+ unsigned long tag)
+{
+ unsigned long t = tag;
+
+ if ((!id) || (level > id->level) || (id->pages_per_area == 0))
+ return NULL;
+ return debug_exception_common(id, level, &t, sizeof(unsigned long));
+}
+
+static inline debug_entry_t *debug_text_exception(debug_info_t *id, int level,
+ const char *txt)
+{
+ if ((!id) || (level > id->level) || (id->pages_per_area == 0))
+ return NULL;
+ return debug_exception_common(id, level, txt, strlen(txt));
+}
+
+/*
+ * IMPORTANT: Use "%s" in sprintf format strings with care! Only pointers are
+ * stored in the s390dbf. See Documentation/s390/s390dbf.txt for more details!
+ */
+extern debug_entry_t *
+__debug_sprintf_exception(debug_info_t *id, int level, char *string, ...)
+ __attribute__ ((format(printf, 3, 4)));
+
+#define debug_sprintf_exception(_id, _level, _fmt, ...) \
+({ \
+ debug_entry_t *__ret; \
+ debug_info_t *__id = _id; \
+ int __level = _level; \
+ \
+ if ((!__id) || (__level > __id->level)) \
+ __ret = NULL; \
+ else \
+ __ret = __debug_sprintf_exception(__id, __level, \
+ _fmt, ## __VA_ARGS__);\
+ __ret; \
+})
+
+int debug_register_view(debug_info_t *id, struct debug_view *view);
+int debug_unregister_view(debug_info_t *id, struct debug_view *view);
+
+/*
+ define the debug levels:
+ - 0 No debugging output to console or syslog
+ - 1 Log internal errors to syslog, ignore check conditions
+ - 2 Log internal errors and check conditions to syslog
+ - 3 Log internal errors to console, log check conditions to syslog
+ - 4 Log internal errors and check conditions to console
+ - 5 panic on internal errors, log check conditions to console
+ - 6 panic on both, internal errors and check conditions
+ */
+
+#ifndef DEBUG_LEVEL
+#define DEBUG_LEVEL 4
+#endif
+
+#define INTERNAL_ERRMSG(x,y...) "E" __FILE__ "%d: " x, __LINE__, y
+#define INTERNAL_WRNMSG(x,y...) "W" __FILE__ "%d: " x, __LINE__, y
+#define INTERNAL_INFMSG(x,y...) "I" __FILE__ "%d: " x, __LINE__, y
+#define INTERNAL_DEBMSG(x,y...) "D" __FILE__ "%d: " x, __LINE__, y
+
+#if DEBUG_LEVEL > 0
+#define PRINT_DEBUG(x...) printk(KERN_DEBUG PRINTK_HEADER x)
+#define PRINT_INFO(x...) printk(KERN_INFO PRINTK_HEADER x)
+#define PRINT_WARN(x...) printk(KERN_WARNING PRINTK_HEADER x)
+#define PRINT_ERR(x...) printk(KERN_ERR PRINTK_HEADER x)
+#define PRINT_FATAL(x...) panic(PRINTK_HEADER x)
+#else
+#define PRINT_DEBUG(x...) printk(KERN_DEBUG PRINTK_HEADER x)
+#define PRINT_INFO(x...) printk(KERN_DEBUG PRINTK_HEADER x)
+#define PRINT_WARN(x...) printk(KERN_DEBUG PRINTK_HEADER x)
+#define PRINT_ERR(x...) printk(KERN_DEBUG PRINTK_HEADER x)
+#define PRINT_FATAL(x...) printk(KERN_DEBUG PRINTK_HEADER x)
+#endif /* DASD_DEBUG */
+
+#endif /* DEBUG_H */