diff options
Diffstat (limited to 'arch/s390/include/asm/debug.h')
| -rw-r--r-- | arch/s390/include/asm/debug.h | 164 |
1 files changed, 122 insertions, 42 deletions
diff --git a/arch/s390/include/asm/debug.h b/arch/s390/include/asm/debug.h index 310134015541..6375276d94ea 100644 --- a/arch/s390/include/asm/debug.h +++ b/arch/s390/include/asm/debug.h @@ -2,17 +2,18 @@ /* * S/390 debug facility * - * Copyright IBM Corp. 1999, 2000 + * Copyright IBM Corp. 1999, 2020 */ -#ifndef DEBUG_H -#define DEBUG_H +#ifndef _ASM_S390_DEBUG_H +#define _ASM_S390_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> +#include <linux/fs.h> +#include <linux/init.h> #define DEBUG_MAX_LEVEL 6 /* debug levels range from 0 to 6 */ #define DEBUG_OFF_LEVEL -1 /* level where debug is switched off */ @@ -26,6 +27,16 @@ #define DEBUG_DATA(entry) (char *)(entry + 1) /* data is stored behind */ /* the entry information */ +#define __DEBUG_FEATURE_VERSION 3 /* version of debug feature */ + +struct __debug_entry { + unsigned long clock : 60; + unsigned long exception : 1; + unsigned long level : 3; + void *caller; + unsigned short cpu; +} __packed; + typedef struct __debug_entry debug_entry_t; struct debug_view; @@ -55,14 +66,15 @@ typedef int (debug_header_proc_t) (debug_info_t *id, struct debug_view *view, int area, debug_entry_t *entry, - char *out_buf); + char *out_buf, size_t out_buf_size); typedef int (debug_format_proc_t) (debug_info_t *id, struct debug_view *view, char *out_buf, + size_t out_buf_size, const char *in_buf); typedef int (debug_prolog_proc_t) (debug_info_t *id, struct debug_view *view, - char *out_buf); + char *out_buf, size_t out_buf_size); typedef int (debug_input_proc_t) (debug_info_t *id, struct debug_view *view, struct file *file, @@ -70,8 +82,13 @@ typedef int (debug_input_proc_t) (debug_info_t *id, 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); + int area, debug_entry_t *entry, + char *out_buf, size_t out_buf_size); +#define DEBUG_SPRINTF_MAX_ARGS 10 +int debug_sprintf_format_fn(debug_info_t *id, struct debug_view *view, + char *out_buf, size_t out_buf_size, + const char *inbuf); struct debug_view { char name[DEBUG_MAX_NAME_LEN]; debug_prolog_proc_t *prolog_proc; @@ -82,7 +99,6 @@ struct debug_view { }; 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 */ @@ -102,6 +118,9 @@ 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); +ssize_t debug_dump(debug_info_t *id, struct debug_view *view, + char *buf, size_t buf_size, bool reverse); + void debug_unregister(debug_info_t *id); void debug_set_level(debug_info_t *id, int new_level); @@ -212,7 +231,7 @@ static inline debug_entry_t *debug_text_event(debug_info_t *id, int level, /* * IMPORTANT: Use "%s" in sprintf format strings with care! Only pointers are - * stored in the s390dbf. See Documentation/s390/s390dbf.rst for more details! + * stored in the s390dbf. See Documentation/arch/s390/s390dbf.rst for more details! */ extern debug_entry_t * __debug_sprintf_event(debug_info_t *id, int level, char *string, ...) @@ -340,7 +359,7 @@ static inline debug_entry_t *debug_text_exception(debug_info_t *id, int level, /* * IMPORTANT: Use "%s" in sprintf format strings with care! Only pointers are - * stored in the s390dbf. See Documentation/s390/s390dbf.rst for more details! + * stored in the s390dbf. See Documentation/arch/s390/s390dbf.rst for more details! */ extern debug_entry_t * __debug_sprintf_exception(debug_info_t *id, int level, char *string, ...) @@ -382,38 +401,99 @@ int debug_register_view(debug_info_t *id, struct debug_view *view); int debug_unregister_view(debug_info_t *id, struct debug_view *view); +#ifndef MODULE + +/* + * Note: Initial page and area numbers must be fixed to allow static + * initialization. This enables very early tracing. Changes to these values + * must be reflected in __DEFINE_STATIC_AREA. + */ +#define EARLY_PAGES 8 +#define EARLY_AREAS 1 + +#define VNAME(var, suffix) __##var##_##suffix + /* - 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 + * Define static areas for early trace data. During boot debug_register_static() + * will replace these with dynamically allocated areas to allow custom page and + * area sizes, and dynamic resizing. */ +#define __DEFINE_STATIC_AREA(var) \ +static char VNAME(var, data)[EARLY_PAGES][PAGE_SIZE] __initdata; \ +static debug_entry_t *VNAME(var, pages)[EARLY_PAGES] __initdata = { \ + (debug_entry_t *)VNAME(var, data)[0], \ + (debug_entry_t *)VNAME(var, data)[1], \ + (debug_entry_t *)VNAME(var, data)[2], \ + (debug_entry_t *)VNAME(var, data)[3], \ + (debug_entry_t *)VNAME(var, data)[4], \ + (debug_entry_t *)VNAME(var, data)[5], \ + (debug_entry_t *)VNAME(var, data)[6], \ + (debug_entry_t *)VNAME(var, data)[7], \ +}; \ +static debug_entry_t **VNAME(var, areas)[EARLY_AREAS] __initdata = { \ + (debug_entry_t **)VNAME(var, pages), \ +}; \ +static int VNAME(var, active_pages)[EARLY_AREAS] __initdata; \ +static int VNAME(var, active_entries)[EARLY_AREAS] __initdata + +#define __DEBUG_INFO_INIT(var, _name, _buf_size) { \ + .next = NULL, \ + .prev = NULL, \ + .ref_count = REFCOUNT_INIT(1), \ + .lock = __SPIN_LOCK_UNLOCKED(var.lock), \ + .level = DEBUG_DEFAULT_LEVEL, \ + .nr_areas = EARLY_AREAS, \ + .pages_per_area = EARLY_PAGES, \ + .buf_size = (_buf_size), \ + .entry_size = sizeof(debug_entry_t) + (_buf_size), \ + .areas = VNAME(var, areas), \ + .active_area = 0, \ + .active_pages = VNAME(var, active_pages), \ + .active_entries = VNAME(var, active_entries), \ + .debugfs_root_entry = NULL, \ + .debugfs_entries = { NULL }, \ + .views = { NULL }, \ + .name = (_name), \ + .mode = 0600, \ +} + +#define __REGISTER_STATIC_DEBUG_INFO(var, name, pages, areas, view) \ +static int __init VNAME(var, reg)(void) \ +{ \ + debug_register_static(&var, (pages), (areas)); \ + debug_register_view(&var, (view)); \ + return 0; \ +} \ +arch_initcall(VNAME(var, reg)) + +/** + * DEFINE_STATIC_DEBUG_INFO - Define static debug_info_t + * + * @var: Name of debug_info_t variable + * @name: Name of debug log (e.g. used for debugfs entry) + * @pages: Number of pages per area + * @nr_areas: Number of debug areas + * @buf_size: Size of data area in each debug entry + * @view: Pointer to debug view struct + * + * Define a static debug_info_t for early tracing. The associated debugfs log + * is automatically registered with the specified debug view. + * + * Important: Users of this macro must not call any of the + * debug_register/_unregister() functions for this debug_info_t! + * + * Note: Tracing will start with a fixed number of initial pages and areas. + * The debug area will be changed to use the specified numbers during + * arch_initcall. + */ +#define DEFINE_STATIC_DEBUG_INFO(var, name, pages, nr_areas, buf_size, view) \ +__DEFINE_STATIC_AREA(var); \ +static debug_info_t __refdata var = \ + __DEBUG_INFO_INIT(var, (name), (buf_size)); \ +__REGISTER_STATIC_DEBUG_INFO(var, name, pages, nr_areas, view) + +void debug_register_static(debug_info_t *id, int pages_per_area, int nr_areas); + +#endif /* MODULE */ -#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 */ +#endif /* _ASM_S390_DEBUG_H */ |