github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-05-24 15:12:13 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

s390/debug: Add debug_dump() to write debug view to a string buffer

Browse Source 
The debug_dump() function allows to get the content of a debug log and
view pair in a string buffer. One future application of this is to
provide debug logs to the platform to be collected with hardware error
logs during recovery.

Reviewed-by: Halil Pasic <pasic@linux.ibm.com>
Co-developed-by: Halil Pasic <pasic@linux.ibm.com>
Signed-off-by: Halil Pasic <pasic@linux.ibm.com>
Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
This commit is contained in:
Niklas Schnelle 2024-12-13 14:47:31 +01:00 committed by Alexander Gordeev
parent 460c52a57f
commit 5f952dae48
2 changed files with 50 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
arch/s390/include/asm/debug.h
View File

@ -114,6 +114,9 @@ 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);
void debug_unregister(debug_info_t *id);
void debug_set_level(debug_info_t *id, int new_level);

47
arch/s390/kernel/debug.c
View File

@ -632,6 +632,53 @@ static int debug_close(struct inode *inode, struct file *file)
return 0; /* success */
}
/**
* debug_dump - Get a textual representation of debug info, or as much as fits
* @id: Debug information to use
* @view: View with which to dump the debug information
* @buf: Buffer the textual debug data representation is written to
* @buf_size: Size of the buffer, including the trailing '\0' byte
*
* This function may be used whenever a textual representation of the debug
* information is required without using an s390dbf file.
*
* Note: It is the callers responsibility to supply a view that is compatible
* with the debug information data.
*
* Return: On success returns the number of bytes written to the buffer not
* including the trailing '\0' byte. If bug_size == 0 the function returns 0.
* On failure an error code less than 0 is returned.
*/
ssize_t debug_dump(debug_info_t *id, struct debug_view *view,
char *buf, size_t buf_size)
{
file_private_info_t *p_info;
size_t size, offset = 0;
/* Need space for '\0' byte */
if (buf_size < 1)
return 0;
buf_size--;
p_info = debug_file_private_alloc(id, view);
if (!p_info)
return -ENOMEM;
/* There is always at least the DEBUG_PROLOG_ENTRY */
do {
size = debug_format_entry(p_info);
size = min(size, buf_size - offset);
memcpy(buf + offset, p_info->temp_buf, size);
offset += size;
if (offset >= buf_size)
break;
} while (debug_next_entry(p_info));
debug_file_private_free(p_info);
buf[offset] = '\0';
return offset;
}
/* Create debugfs entries and add to internal list. */
static void _debug_register(debug_info_t *id)
{