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9637c3f318
The new function supports setting of permissions for the debugfs files created by the debug feature. In addition to that, the function provides uid and gid as parameters for future use. Currently only root is allowed for uid and gid. Signed-off-by: Michael Holzheu <holzheu@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
649 lines
23 KiB
Text
649 lines
23 KiB
Text
S390 Debug Feature
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==================
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files: arch/s390/kernel/debug.c
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include/asm-s390/debug.h
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Description:
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------------
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The goal of this feature is to provide a kernel debug logging API
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where log records can be stored efficiently in memory, where each component
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(e.g. device drivers) can have one separate debug log.
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One purpose of this is to inspect the debug logs after a production system crash
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in order to analyze the reason for the crash.
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If the system still runs but only a subcomponent which uses dbf fails,
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it is possible to look at the debug logs on a live system via the Linux
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debugfs filesystem.
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The debug feature may also very useful for kernel and driver development.
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Design:
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-------
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Kernel components (e.g. device drivers) can register themselves at the debug
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feature with the function call debug_register(). This function initializes a
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debug log for the caller. For each debug log exists a number of debug areas
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where exactly one is active at one time. Each debug area consists of contiguous
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pages in memory. In the debug areas there are stored debug entries (log records)
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which are written by event- and exception-calls.
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An event-call writes the specified debug entry to the active debug
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area and updates the log pointer for the active area. If the end
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of the active debug area is reached, a wrap around is done (ring buffer)
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and the next debug entry will be written at the beginning of the active
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debug area.
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An exception-call writes the specified debug entry to the log and
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switches to the next debug area. This is done in order to be sure
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that the records which describe the origin of the exception are not
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overwritten when a wrap around for the current area occurs.
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The debug areas themselves are also ordered in form of a ring buffer.
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When an exception is thrown in the last debug area, the following debug
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entries are then written again in the very first area.
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There are three versions for the event- and exception-calls: One for
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logging raw data, one for text and one for numbers.
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Each debug entry contains the following data:
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- Timestamp
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- Cpu-Number of calling task
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- Level of debug entry (0...6)
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- Return Address to caller
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- Flag, if entry is an exception or not
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The debug logs can be inspected in a live system through entries in
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the debugfs-filesystem. Under the toplevel directory "s390dbf" there is
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a directory for each registered component, which is named like the
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corresponding component. The debugfs normally should be mounted to
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/sys/kernel/debug therefore the debug feature can be accessed under
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/sys/kernel/debug/s390dbf.
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The content of the directories are files which represent different views
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to the debug log. Each component can decide which views should be
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used through registering them with the function debug_register_view().
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Predefined views for hex/ascii, sprintf and raw binary data are provided.
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It is also possible to define other views. The content of
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a view can be inspected simply by reading the corresponding debugfs file.
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All debug logs have an actual debug level (range from 0 to 6).
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The default level is 3. Event and Exception functions have a 'level'
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parameter. Only debug entries with a level that is lower or equal
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than the actual level are written to the log. This means, when
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writing events, high priority log entries should have a low level
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value whereas low priority entries should have a high one.
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The actual debug level can be changed with the help of the debugfs-filesystem
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through writing a number string "x" to the 'level' debugfs file which is
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provided for every debug log. Debugging can be switched off completely
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by using "-" on the 'level' debugfs file.
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Example:
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> echo "-" > /sys/kernel/debug/s390dbf/dasd/level
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It is also possible to deactivate the debug feature globally for every
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debug log. You can change the behavior using 2 sysctl parameters in
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/proc/sys/s390dbf:
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There are currently 2 possible triggers, which stop the debug feature
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globally. The first possibility is to use the "debug_active" sysctl. If
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set to 1 the debug feature is running. If "debug_active" is set to 0 the
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debug feature is turned off.
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The second trigger which stops the debug feature is a kernel oops.
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That prevents the debug feature from overwriting debug information that
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happened before the oops. After an oops you can reactivate the debug feature
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by piping 1 to /proc/sys/s390dbf/debug_active. Nevertheless, its not
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suggested to use an oopsed kernel in a production environment.
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If you want to disallow the deactivation of the debug feature, you can use
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the "debug_stoppable" sysctl. If you set "debug_stoppable" to 0 the debug
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feature cannot be stopped. If the debug feature is already stopped, it
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will stay deactivated.
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Kernel Interfaces:
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------------------
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----------------------------------------------------------------------------
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debug_info_t *debug_register(char *name, int pages, int nr_areas,
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int buf_size);
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Parameter: name: Name of debug log (e.g. used for debugfs entry)
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pages: number of pages, which will be allocated per area
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nr_areas: number of debug areas
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buf_size: size of data area in each debug entry
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Return Value: Handle for generated debug area
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NULL if register failed
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Description: Allocates memory for a debug log
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Must not be called within an interrupt handler
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----------------------------------------------------------------------------
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debug_info_t *debug_register_mode(char *name, int pages, int nr_areas,
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int buf_size, mode_t mode, uid_t uid,
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gid_t gid);
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Parameter: name: Name of debug log (e.g. used for debugfs entry)
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pages: Number of pages, which will be allocated per area
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nr_areas: Number of debug areas
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buf_size: Size of data area in each debug entry
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mode: File mode for debugfs files. E.g. S_IRWXUGO
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uid: User ID for debugfs files. Currently only 0 is
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supported.
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gid: Group ID for debugfs files. Currently only 0 is
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supported.
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Return Value: Handle for generated debug area
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NULL if register failed
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Description: Allocates memory for a debug log
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Must not be called within an interrupt handler
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---------------------------------------------------------------------------
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void debug_unregister (debug_info_t * id);
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Parameter: id: handle for debug log
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Return Value: none
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Description: frees memory for a debug log
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Must not be called within an interrupt handler
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---------------------------------------------------------------------------
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void debug_set_level (debug_info_t * id, int new_level);
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Parameter: id: handle for debug log
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new_level: new debug level
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Return Value: none
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Description: Sets new actual debug level if new_level is valid.
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---------------------------------------------------------------------------
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void debug_stop_all(void);
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Parameter: none
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Return Value: none
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Description: stops the debug feature if stopping is allowed. Currently
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used in case of a kernel oops.
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---------------------------------------------------------------------------
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debug_entry_t* debug_event (debug_info_t* id, int level, void* data,
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int length);
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Parameter: id: handle for debug log
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level: debug level
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data: pointer to data for debug entry
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length: length of data in bytes
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Return Value: Address of written debug entry
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Description: writes debug entry to active debug area (if level <= actual
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debug level)
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---------------------------------------------------------------------------
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debug_entry_t* debug_int_event (debug_info_t * id, int level,
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unsigned int data);
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debug_entry_t* debug_long_event(debug_info_t * id, int level,
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unsigned long data);
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Parameter: id: handle for debug log
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level: debug level
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data: integer value for debug entry
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Return Value: Address of written debug entry
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Description: writes debug entry to active debug area (if level <= actual
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debug level)
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---------------------------------------------------------------------------
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debug_entry_t* debug_text_event (debug_info_t * id, int level,
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const char* data);
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Parameter: id: handle for debug log
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level: debug level
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data: string for debug entry
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Return Value: Address of written debug entry
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Description: writes debug entry in ascii format to active debug area
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(if level <= actual debug level)
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---------------------------------------------------------------------------
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debug_entry_t* debug_sprintf_event (debug_info_t * id, int level,
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char* string,...);
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Parameter: id: handle for debug log
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level: debug level
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string: format string for debug entry
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...: varargs used as in sprintf()
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Return Value: Address of written debug entry
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Description: writes debug entry with format string and varargs (longs) to
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active debug area (if level $<=$ actual debug level).
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floats and long long datatypes cannot be used as varargs.
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---------------------------------------------------------------------------
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debug_entry_t* debug_exception (debug_info_t* id, int level, void* data,
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int length);
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Parameter: id: handle for debug log
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level: debug level
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data: pointer to data for debug entry
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length: length of data in bytes
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Return Value: Address of written debug entry
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Description: writes debug entry to active debug area (if level <= actual
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debug level) and switches to next debug area
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---------------------------------------------------------------------------
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debug_entry_t* debug_int_exception (debug_info_t * id, int level,
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unsigned int data);
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debug_entry_t* debug_long_exception(debug_info_t * id, int level,
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unsigned long data);
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Parameter: id: handle for debug log
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level: debug level
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data: integer value for debug entry
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Return Value: Address of written debug entry
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Description: writes debug entry to active debug area (if level <= actual
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debug level) and switches to next debug area
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---------------------------------------------------------------------------
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debug_entry_t* debug_text_exception (debug_info_t * id, int level,
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const char* data);
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Parameter: id: handle for debug log
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level: debug level
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data: string for debug entry
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Return Value: Address of written debug entry
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Description: writes debug entry in ascii format to active debug area
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(if level <= actual debug level) and switches to next debug
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area
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---------------------------------------------------------------------------
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debug_entry_t* debug_sprintf_exception (debug_info_t * id, int level,
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char* string,...);
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Parameter: id: handle for debug log
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level: debug level
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string: format string for debug entry
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...: varargs used as in sprintf()
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Return Value: Address of written debug entry
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Description: writes debug entry with format string and varargs (longs) to
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active debug area (if level $<=$ actual debug level) and
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switches to next debug area.
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floats and long long datatypes cannot be used as varargs.
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---------------------------------------------------------------------------
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int debug_register_view (debug_info_t * id, struct debug_view *view);
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Parameter: id: handle for debug log
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view: pointer to debug view struct
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Return Value: 0 : ok
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< 0: Error
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Description: registers new debug view and creates debugfs dir entry
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---------------------------------------------------------------------------
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int debug_unregister_view (debug_info_t * id, struct debug_view *view);
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Parameter: id: handle for debug log
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view: pointer to debug view struct
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Return Value: 0 : ok
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< 0: Error
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Description: unregisters debug view and removes debugfs dir entry
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Predefined views:
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-----------------
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extern struct debug_view debug_hex_ascii_view;
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extern struct debug_view debug_raw_view;
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extern struct debug_view debug_sprintf_view;
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Examples
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--------
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/*
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* hex_ascii- + raw-view Example
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*/
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#include <linux/init.h>
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#include <asm/debug.h>
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static debug_info_t* debug_info;
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static int init(void)
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{
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/* register 4 debug areas with one page each and 4 byte data field */
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debug_info = debug_register ("test", 1, 4, 4 );
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debug_register_view(debug_info,&debug_hex_ascii_view);
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debug_register_view(debug_info,&debug_raw_view);
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debug_text_event(debug_info, 4 , "one ");
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debug_int_exception(debug_info, 4, 4711);
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debug_event(debug_info, 3, &debug_info, 4);
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return 0;
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}
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static void cleanup(void)
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{
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debug_unregister (debug_info);
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}
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module_init(init);
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module_exit(cleanup);
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---------------------------------------------------------------------------
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/*
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* sprintf-view Example
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*/
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#include <linux/init.h>
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#include <asm/debug.h>
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static debug_info_t* debug_info;
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static int init(void)
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{
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/* register 4 debug areas with one page each and data field for */
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/* format string pointer + 2 varargs (= 3 * sizeof(long)) */
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debug_info = debug_register ("test", 1, 4, sizeof(long) * 3);
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debug_register_view(debug_info,&debug_sprintf_view);
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debug_sprintf_event(debug_info, 2 , "first event in %s:%i\n",__FILE__,__LINE__);
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debug_sprintf_exception(debug_info, 1, "pointer to debug info: %p\n",&debug_info);
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return 0;
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}
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static void cleanup(void)
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{
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debug_unregister (debug_info);
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}
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module_init(init);
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module_exit(cleanup);
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Debugfs Interface
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----------------
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Views to the debug logs can be investigated through reading the corresponding
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debugfs-files:
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Example:
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> ls /sys/kernel/debug/s390dbf/dasd
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flush hex_ascii level pages raw
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> cat /sys/kernel/debug/s390dbf/dasd/hex_ascii | sort +1
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00 00974733272:680099 2 - 02 0006ad7e 07 ea 4a 90 | ....
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00 00974733272:682210 2 - 02 0006ade6 46 52 45 45 | FREE
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00 00974733272:682213 2 - 02 0006adf6 07 ea 4a 90 | ....
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00 00974733272:682281 1 * 02 0006ab08 41 4c 4c 43 | EXCP
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01 00974733272:682284 2 - 02 0006ab16 45 43 4b 44 | ECKD
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01 00974733272:682287 2 - 02 0006ab28 00 00 00 04 | ....
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01 00974733272:682289 2 - 02 0006ab3e 00 00 00 20 | ...
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01 00974733272:682297 2 - 02 0006ad7e 07 ea 4a 90 | ....
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01 00974733272:684384 2 - 00 0006ade6 46 52 45 45 | FREE
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01 00974733272:684388 2 - 00 0006adf6 07 ea 4a 90 | ....
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See section about predefined views for explanation of the above output!
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Changing the debug level
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------------------------
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Example:
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> cat /sys/kernel/debug/s390dbf/dasd/level
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3
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> echo "5" > /sys/kernel/debug/s390dbf/dasd/level
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> cat /sys/kernel/debug/s390dbf/dasd/level
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5
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Flushing debug areas
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--------------------
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Debug areas can be flushed with piping the number of the desired
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area (0...n) to the debugfs file "flush". When using "-" all debug areas
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are flushed.
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Examples:
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1. Flush debug area 0:
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> echo "0" > /sys/kernel/debug/s390dbf/dasd/flush
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2. Flush all debug areas:
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> echo "-" > /sys/kernel/debug/s390dbf/dasd/flush
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Changing the size of debug areas
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------------------------------------
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It is possible the change the size of debug areas through piping
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the number of pages to the debugfs file "pages". The resize request will
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also flush the debug areas.
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Example:
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Define 4 pages for the debug areas of debug feature "dasd":
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> echo "4" > /sys/kernel/debug/s390dbf/dasd/pages
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Stooping the debug feature
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--------------------------
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Example:
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1. Check if stopping is allowed
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> cat /proc/sys/s390dbf/debug_stoppable
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2. Stop debug feature
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> echo 0 > /proc/sys/s390dbf/debug_active
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lcrash Interface
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----------------
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It is planned that the dump analysis tool lcrash gets an additional command
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's390dbf' to display all the debug logs. With this tool it will be possible
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to investigate the debug logs on a live system and with a memory dump after
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a system crash.
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Investigating raw memory
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------------------------
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One last possibility to investigate the debug logs at a live
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system and after a system crash is to look at the raw memory
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under VM or at the Service Element.
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It is possible to find the anker of the debug-logs through
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the 'debug_area_first' symbol in the System map. Then one has
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to follow the correct pointers of the data-structures defined
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in debug.h and find the debug-areas in memory.
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Normally modules which use the debug feature will also have
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a global variable with the pointer to the debug-logs. Following
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this pointer it will also be possible to find the debug logs in
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memory.
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For this method it is recommended to use '16 * x + 4' byte (x = 0..n)
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for the length of the data field in debug_register() in
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order to see the debug entries well formatted.
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Predefined Views
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----------------
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There are three predefined views: hex_ascii, raw and sprintf.
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The hex_ascii view shows the data field in hex and ascii representation
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(e.g. '45 43 4b 44 | ECKD').
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The raw view returns a bytestream as the debug areas are stored in memory.
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The sprintf view formats the debug entries in the same way as the sprintf
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function would do. The sprintf event/exception functions write to the
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debug entry a pointer to the format string (size = sizeof(long))
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and for each vararg a long value. So e.g. for a debug entry with a format
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string plus two varargs one would need to allocate a (3 * sizeof(long))
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byte data area in the debug_register() function.
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NOTE: If using the sprintf view do NOT use other event/exception functions
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than the sprintf-event and -exception functions.
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The format of the hex_ascii and sprintf view is as follows:
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- Number of area
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- Timestamp (formatted as seconds and microseconds since 00:00:00 Coordinated
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Universal Time (UTC), January 1, 1970)
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- level of debug entry
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- Exception flag (* = Exception)
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- Cpu-Number of calling task
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- Return Address to caller
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- data field
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The format of the raw view is:
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- Header as described in debug.h
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- datafield
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A typical line of the hex_ascii view will look like the following (first line
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is only for explanation and will not be displayed when 'cating' the view):
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area time level exception cpu caller data (hex + ascii)
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--------------------------------------------------------------------------
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00 00964419409:440690 1 - 00 88023fe
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Defining views
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--------------
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Views are specified with the 'debug_view' structure. There are defined
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callback functions which are used for reading and writing the debugfs files:
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struct debug_view {
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char name[DEBUG_MAX_PROCF_LEN];
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debug_prolog_proc_t* prolog_proc;
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debug_header_proc_t* header_proc;
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debug_format_proc_t* format_proc;
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debug_input_proc_t* input_proc;
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void* private_data;
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};
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where
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typedef int (debug_header_proc_t) (debug_info_t* id,
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struct debug_view* view,
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int area,
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debug_entry_t* entry,
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char* out_buf);
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typedef int (debug_format_proc_t) (debug_info_t* id,
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struct debug_view* view, char* out_buf,
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const char* in_buf);
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typedef int (debug_prolog_proc_t) (debug_info_t* id,
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struct debug_view* view,
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char* out_buf);
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typedef int (debug_input_proc_t) (debug_info_t* id,
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struct debug_view* view,
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struct file* file, const char* user_buf,
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size_t in_buf_size, loff_t* offset);
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The "private_data" member can be used as pointer to view specific data.
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It is not used by the debug feature itself.
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The output when reading a debugfs file is structured like this:
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"prolog_proc output"
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"header_proc output 1" "format_proc output 1"
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"header_proc output 2" "format_proc output 2"
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"header_proc output 3" "format_proc output 3"
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...
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When a view is read from the debugfs, the Debug Feature calls the
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'prolog_proc' once for writing the prolog.
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Then 'header_proc' and 'format_proc' are called for each
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existing debug entry.
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The input_proc can be used to implement functionality when it is written to
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the view (e.g. like with 'echo "0" > /sys/kernel/debug/s390dbf/dasd/level).
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For header_proc there can be used the default function
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debug_dflt_header_fn() which is defined in debug.h.
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and which produces the same header output as the predefined views.
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E.g:
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00 00964419409:440761 2 - 00 88023ec
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In order to see how to use the callback functions check the implementation
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of the default views!
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Example
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#include <asm/debug.h>
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#define UNKNOWNSTR "data: %08x"
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const char* messages[] =
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{"This error...........\n",
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"That error...........\n",
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"Problem..............\n",
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"Something went wrong.\n",
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"Everything ok........\n",
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NULL
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};
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static int debug_test_format_fn(
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debug_info_t * id, struct debug_view *view,
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char *out_buf, const char *in_buf
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)
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{
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int i, rc = 0;
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if(id->buf_size >= 4) {
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int msg_nr = *((int*)in_buf);
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if(msg_nr < sizeof(messages)/sizeof(char*) - 1)
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rc += sprintf(out_buf, "%s", messages[msg_nr]);
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else
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rc += sprintf(out_buf, UNKNOWNSTR, msg_nr);
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}
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out:
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return rc;
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}
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struct debug_view debug_test_view = {
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"myview", /* name of view */
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NULL, /* no prolog */
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&debug_dflt_header_fn, /* default header for each entry */
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&debug_test_format_fn, /* our own format function */
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NULL, /* no input function */
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NULL /* no private data */
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};
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=====
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test:
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|
=====
|
|
debug_info_t *debug_info;
|
|
...
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|
debug_info = debug_register ("test", 0, 4, 4 ));
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debug_register_view(debug_info, &debug_test_view);
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for(i = 0; i < 10; i ++) debug_int_event(debug_info, 1, i);
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|
> cat /sys/kernel/debug/s390dbf/test/myview
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|
00 00964419734:611402 1 - 00 88042ca This error...........
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00 00964419734:611405 1 - 00 88042ca That error...........
|
|
00 00964419734:611408 1 - 00 88042ca Problem..............
|
|
00 00964419734:611411 1 - 00 88042ca Something went wrong.
|
|
00 00964419734:611414 1 - 00 88042ca Everything ok........
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|
00 00964419734:611417 1 - 00 88042ca data: 00000005
|
|
00 00964419734:611419 1 - 00 88042ca data: 00000006
|
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00 00964419734:611422 1 - 00 88042ca data: 00000007
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|
00 00964419734:611425 1 - 00 88042ca data: 00000008
|
|
00 00964419734:611428 1 - 00 88042ca data: 00000009
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