mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
1484 lines
36 KiB
1484 lines
36 KiB
// SPDX-License-Identifier: GPL-2.0 |
|
/* |
|
* S/390 debug facility |
|
* |
|
* Copyright IBM Corp. 1999, 2020 |
|
* |
|
* Author(s): Michael Holzheu ([email protected]), |
|
* Holger Smolinski ([email protected]) |
|
* |
|
* Bugreports to: <[email protected]> |
|
*/ |
|
|
|
#define KMSG_COMPONENT "s390dbf" |
|
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt |
|
|
|
#include <linux/stddef.h> |
|
#include <linux/kernel.h> |
|
#include <linux/errno.h> |
|
#include <linux/slab.h> |
|
#include <linux/ctype.h> |
|
#include <linux/string.h> |
|
#include <linux/sysctl.h> |
|
#include <linux/uaccess.h> |
|
#include <linux/export.h> |
|
#include <linux/init.h> |
|
#include <linux/fs.h> |
|
#include <linux/debugfs.h> |
|
|
|
#include <asm/debug.h> |
|
|
|
#define DEBUG_PROLOG_ENTRY -1 |
|
|
|
#define ALL_AREAS 0 /* copy all debug areas */ |
|
#define NO_AREAS 1 /* copy no debug areas */ |
|
|
|
/* typedefs */ |
|
|
|
typedef struct file_private_info { |
|
loff_t offset; /* offset of last read in file */ |
|
int act_area; /* number of last formated area */ |
|
int act_page; /* act page in given area */ |
|
int act_entry; /* last formated entry (offset */ |
|
/* relative to beginning of last */ |
|
/* formated page) */ |
|
size_t act_entry_offset; /* up to this offset we copied */ |
|
/* in last read the last formated */ |
|
/* entry to userland */ |
|
char temp_buf[2048]; /* buffer for output */ |
|
debug_info_t *debug_info_org; /* original debug information */ |
|
debug_info_t *debug_info_snap; /* snapshot of debug information */ |
|
struct debug_view *view; /* used view of debug info */ |
|
} file_private_info_t; |
|
|
|
typedef struct { |
|
char *string; |
|
/* |
|
* This assumes that all args are converted into longs |
|
* on L/390 this is the case for all types of parameter |
|
* except of floats, and long long (32 bit) |
|
* |
|
*/ |
|
long args[0]; |
|
} debug_sprintf_entry_t; |
|
|
|
/* internal function prototyes */ |
|
|
|
static int debug_init(void); |
|
static ssize_t debug_output(struct file *file, char __user *user_buf, |
|
size_t user_len, loff_t *offset); |
|
static ssize_t debug_input(struct file *file, const char __user *user_buf, |
|
size_t user_len, loff_t *offset); |
|
static int debug_open(struct inode *inode, struct file *file); |
|
static int debug_close(struct inode *inode, struct file *file); |
|
static debug_info_t *debug_info_create(const char *name, int pages_per_area, |
|
int nr_areas, int buf_size, umode_t mode); |
|
static void debug_info_get(debug_info_t *); |
|
static void debug_info_put(debug_info_t *); |
|
static int debug_prolog_level_fn(debug_info_t *id, |
|
struct debug_view *view, char *out_buf); |
|
static int debug_input_level_fn(debug_info_t *id, struct debug_view *view, |
|
struct file *file, const char __user *user_buf, |
|
size_t user_buf_size, loff_t *offset); |
|
static int debug_prolog_pages_fn(debug_info_t *id, |
|
struct debug_view *view, char *out_buf); |
|
static int debug_input_pages_fn(debug_info_t *id, struct debug_view *view, |
|
struct file *file, const char __user *user_buf, |
|
size_t user_buf_size, loff_t *offset); |
|
static int debug_input_flush_fn(debug_info_t *id, struct debug_view *view, |
|
struct file *file, const char __user *user_buf, |
|
size_t user_buf_size, loff_t *offset); |
|
static int debug_hex_ascii_format_fn(debug_info_t *id, struct debug_view *view, |
|
char *out_buf, const char *in_buf); |
|
static int debug_sprintf_format_fn(debug_info_t *id, struct debug_view *view, |
|
char *out_buf, debug_sprintf_entry_t *curr_event); |
|
|
|
/* globals */ |
|
|
|
struct debug_view debug_hex_ascii_view = { |
|
"hex_ascii", |
|
NULL, |
|
&debug_dflt_header_fn, |
|
&debug_hex_ascii_format_fn, |
|
NULL, |
|
NULL |
|
}; |
|
EXPORT_SYMBOL(debug_hex_ascii_view); |
|
|
|
static struct debug_view debug_level_view = { |
|
"level", |
|
&debug_prolog_level_fn, |
|
NULL, |
|
NULL, |
|
&debug_input_level_fn, |
|
NULL |
|
}; |
|
|
|
static struct debug_view debug_pages_view = { |
|
"pages", |
|
&debug_prolog_pages_fn, |
|
NULL, |
|
NULL, |
|
&debug_input_pages_fn, |
|
NULL |
|
}; |
|
|
|
static struct debug_view debug_flush_view = { |
|
"flush", |
|
NULL, |
|
NULL, |
|
NULL, |
|
&debug_input_flush_fn, |
|
NULL |
|
}; |
|
|
|
struct debug_view debug_sprintf_view = { |
|
"sprintf", |
|
NULL, |
|
&debug_dflt_header_fn, |
|
(debug_format_proc_t *)&debug_sprintf_format_fn, |
|
NULL, |
|
NULL |
|
}; |
|
EXPORT_SYMBOL(debug_sprintf_view); |
|
|
|
/* used by dump analysis tools to determine version of debug feature */ |
|
static unsigned int __used debug_feature_version = __DEBUG_FEATURE_VERSION; |
|
|
|
/* static globals */ |
|
|
|
static debug_info_t *debug_area_first; |
|
static debug_info_t *debug_area_last; |
|
static DEFINE_MUTEX(debug_mutex); |
|
|
|
static int initialized; |
|
static int debug_critical; |
|
|
|
static const struct file_operations debug_file_ops = { |
|
.owner = THIS_MODULE, |
|
.read = debug_output, |
|
.write = debug_input, |
|
.open = debug_open, |
|
.release = debug_close, |
|
.llseek = no_llseek, |
|
}; |
|
|
|
static struct dentry *debug_debugfs_root_entry; |
|
|
|
/* functions */ |
|
|
|
/* |
|
* debug_areas_alloc |
|
* - Debug areas are implemented as a threedimensonal array: |
|
* areas[areanumber][pagenumber][pageoffset] |
|
*/ |
|
|
|
static debug_entry_t ***debug_areas_alloc(int pages_per_area, int nr_areas) |
|
{ |
|
debug_entry_t ***areas; |
|
int i, j; |
|
|
|
areas = kmalloc_array(nr_areas, sizeof(debug_entry_t **), GFP_KERNEL); |
|
if (!areas) |
|
goto fail_malloc_areas; |
|
for (i = 0; i < nr_areas; i++) { |
|
/* GFP_NOWARN to avoid user triggerable WARN, we handle fails */ |
|
areas[i] = kmalloc_array(pages_per_area, |
|
sizeof(debug_entry_t *), |
|
GFP_KERNEL | __GFP_NOWARN); |
|
if (!areas[i]) |
|
goto fail_malloc_areas2; |
|
for (j = 0; j < pages_per_area; j++) { |
|
areas[i][j] = kzalloc(PAGE_SIZE, GFP_KERNEL); |
|
if (!areas[i][j]) { |
|
for (j--; j >= 0 ; j--) |
|
kfree(areas[i][j]); |
|
kfree(areas[i]); |
|
goto fail_malloc_areas2; |
|
} |
|
} |
|
} |
|
return areas; |
|
|
|
fail_malloc_areas2: |
|
for (i--; i >= 0; i--) { |
|
for (j = 0; j < pages_per_area; j++) |
|
kfree(areas[i][j]); |
|
kfree(areas[i]); |
|
} |
|
kfree(areas); |
|
fail_malloc_areas: |
|
return NULL; |
|
} |
|
|
|
/* |
|
* debug_info_alloc |
|
* - alloc new debug-info |
|
*/ |
|
static debug_info_t *debug_info_alloc(const char *name, int pages_per_area, |
|
int nr_areas, int buf_size, int level, |
|
int mode) |
|
{ |
|
debug_info_t *rc; |
|
|
|
/* alloc everything */ |
|
rc = kmalloc(sizeof(debug_info_t), GFP_KERNEL); |
|
if (!rc) |
|
goto fail_malloc_rc; |
|
rc->active_entries = kcalloc(nr_areas, sizeof(int), GFP_KERNEL); |
|
if (!rc->active_entries) |
|
goto fail_malloc_active_entries; |
|
rc->active_pages = kcalloc(nr_areas, sizeof(int), GFP_KERNEL); |
|
if (!rc->active_pages) |
|
goto fail_malloc_active_pages; |
|
if ((mode == ALL_AREAS) && (pages_per_area != 0)) { |
|
rc->areas = debug_areas_alloc(pages_per_area, nr_areas); |
|
if (!rc->areas) |
|
goto fail_malloc_areas; |
|
} else { |
|
rc->areas = NULL; |
|
} |
|
|
|
/* initialize members */ |
|
spin_lock_init(&rc->lock); |
|
rc->pages_per_area = pages_per_area; |
|
rc->nr_areas = nr_areas; |
|
rc->active_area = 0; |
|
rc->level = level; |
|
rc->buf_size = buf_size; |
|
rc->entry_size = sizeof(debug_entry_t) + buf_size; |
|
strlcpy(rc->name, name, sizeof(rc->name)); |
|
memset(rc->views, 0, DEBUG_MAX_VIEWS * sizeof(struct debug_view *)); |
|
memset(rc->debugfs_entries, 0, DEBUG_MAX_VIEWS * sizeof(struct dentry *)); |
|
refcount_set(&(rc->ref_count), 0); |
|
|
|
return rc; |
|
|
|
fail_malloc_areas: |
|
kfree(rc->active_pages); |
|
fail_malloc_active_pages: |
|
kfree(rc->active_entries); |
|
fail_malloc_active_entries: |
|
kfree(rc); |
|
fail_malloc_rc: |
|
return NULL; |
|
} |
|
|
|
/* |
|
* debug_areas_free |
|
* - free all debug areas |
|
*/ |
|
static void debug_areas_free(debug_info_t *db_info) |
|
{ |
|
int i, j; |
|
|
|
if (!db_info->areas) |
|
return; |
|
for (i = 0; i < db_info->nr_areas; i++) { |
|
for (j = 0; j < db_info->pages_per_area; j++) |
|
kfree(db_info->areas[i][j]); |
|
kfree(db_info->areas[i]); |
|
} |
|
kfree(db_info->areas); |
|
db_info->areas = NULL; |
|
} |
|
|
|
/* |
|
* debug_info_free |
|
* - free memory debug-info |
|
*/ |
|
static void debug_info_free(debug_info_t *db_info) |
|
{ |
|
debug_areas_free(db_info); |
|
kfree(db_info->active_entries); |
|
kfree(db_info->active_pages); |
|
kfree(db_info); |
|
} |
|
|
|
/* |
|
* debug_info_create |
|
* - create new debug-info |
|
*/ |
|
|
|
static debug_info_t *debug_info_create(const char *name, int pages_per_area, |
|
int nr_areas, int buf_size, umode_t mode) |
|
{ |
|
debug_info_t *rc; |
|
|
|
rc = debug_info_alloc(name, pages_per_area, nr_areas, buf_size, |
|
DEBUG_DEFAULT_LEVEL, ALL_AREAS); |
|
if (!rc) |
|
goto out; |
|
|
|
rc->mode = mode & ~S_IFMT; |
|
|
|
/* create root directory */ |
|
rc->debugfs_root_entry = debugfs_create_dir(rc->name, |
|
debug_debugfs_root_entry); |
|
|
|
/* append new element to linked list */ |
|
if (!debug_area_first) { |
|
/* first element in list */ |
|
debug_area_first = rc; |
|
rc->prev = NULL; |
|
} else { |
|
/* append element to end of list */ |
|
debug_area_last->next = rc; |
|
rc->prev = debug_area_last; |
|
} |
|
debug_area_last = rc; |
|
rc->next = NULL; |
|
|
|
refcount_set(&rc->ref_count, 1); |
|
out: |
|
return rc; |
|
} |
|
|
|
/* |
|
* debug_info_copy |
|
* - copy debug-info |
|
*/ |
|
static debug_info_t *debug_info_copy(debug_info_t *in, int mode) |
|
{ |
|
unsigned long flags; |
|
debug_info_t *rc; |
|
int i, j; |
|
|
|
/* get a consistent copy of the debug areas */ |
|
do { |
|
rc = debug_info_alloc(in->name, in->pages_per_area, |
|
in->nr_areas, in->buf_size, in->level, mode); |
|
spin_lock_irqsave(&in->lock, flags); |
|
if (!rc) |
|
goto out; |
|
/* has something changed in the meantime ? */ |
|
if ((rc->pages_per_area == in->pages_per_area) && |
|
(rc->nr_areas == in->nr_areas)) { |
|
break; |
|
} |
|
spin_unlock_irqrestore(&in->lock, flags); |
|
debug_info_free(rc); |
|
} while (1); |
|
|
|
if (mode == NO_AREAS) |
|
goto out; |
|
|
|
for (i = 0; i < in->nr_areas; i++) { |
|
for (j = 0; j < in->pages_per_area; j++) |
|
memcpy(rc->areas[i][j], in->areas[i][j], PAGE_SIZE); |
|
} |
|
out: |
|
spin_unlock_irqrestore(&in->lock, flags); |
|
return rc; |
|
} |
|
|
|
/* |
|
* debug_info_get |
|
* - increments reference count for debug-info |
|
*/ |
|
static void debug_info_get(debug_info_t *db_info) |
|
{ |
|
if (db_info) |
|
refcount_inc(&db_info->ref_count); |
|
} |
|
|
|
/* |
|
* debug_info_put: |
|
* - decreases reference count for debug-info and frees it if necessary |
|
*/ |
|
static void debug_info_put(debug_info_t *db_info) |
|
{ |
|
int i; |
|
|
|
if (!db_info) |
|
return; |
|
if (refcount_dec_and_test(&db_info->ref_count)) { |
|
for (i = 0; i < DEBUG_MAX_VIEWS; i++) { |
|
if (!db_info->views[i]) |
|
continue; |
|
debugfs_remove(db_info->debugfs_entries[i]); |
|
} |
|
debugfs_remove(db_info->debugfs_root_entry); |
|
if (db_info == debug_area_first) |
|
debug_area_first = db_info->next; |
|
if (db_info == debug_area_last) |
|
debug_area_last = db_info->prev; |
|
if (db_info->prev) |
|
db_info->prev->next = db_info->next; |
|
if (db_info->next) |
|
db_info->next->prev = db_info->prev; |
|
debug_info_free(db_info); |
|
} |
|
} |
|
|
|
/* |
|
* debug_format_entry: |
|
* - format one debug entry and return size of formated data |
|
*/ |
|
static int debug_format_entry(file_private_info_t *p_info) |
|
{ |
|
debug_info_t *id_snap = p_info->debug_info_snap; |
|
struct debug_view *view = p_info->view; |
|
debug_entry_t *act_entry; |
|
size_t len = 0; |
|
|
|
if (p_info->act_entry == DEBUG_PROLOG_ENTRY) { |
|
/* print prolog */ |
|
if (view->prolog_proc) |
|
len += view->prolog_proc(id_snap, view, p_info->temp_buf); |
|
goto out; |
|
} |
|
if (!id_snap->areas) /* this is true, if we have a prolog only view */ |
|
goto out; /* or if 'pages_per_area' is 0 */ |
|
act_entry = (debug_entry_t *) ((char *)id_snap->areas[p_info->act_area] |
|
[p_info->act_page] + p_info->act_entry); |
|
|
|
if (act_entry->clock == 0LL) |
|
goto out; /* empty entry */ |
|
if (view->header_proc) |
|
len += view->header_proc(id_snap, view, p_info->act_area, |
|
act_entry, p_info->temp_buf + len); |
|
if (view->format_proc) |
|
len += view->format_proc(id_snap, view, p_info->temp_buf + len, |
|
DEBUG_DATA(act_entry)); |
|
out: |
|
return len; |
|
} |
|
|
|
/* |
|
* debug_next_entry: |
|
* - goto next entry in p_info |
|
*/ |
|
static inline int debug_next_entry(file_private_info_t *p_info) |
|
{ |
|
debug_info_t *id; |
|
|
|
id = p_info->debug_info_snap; |
|
if (p_info->act_entry == DEBUG_PROLOG_ENTRY) { |
|
p_info->act_entry = 0; |
|
p_info->act_page = 0; |
|
goto out; |
|
} |
|
if (!id->areas) |
|
return 1; |
|
p_info->act_entry += id->entry_size; |
|
/* switch to next page, if we reached the end of the page */ |
|
if (p_info->act_entry > (PAGE_SIZE - id->entry_size)) { |
|
/* next page */ |
|
p_info->act_entry = 0; |
|
p_info->act_page += 1; |
|
if ((p_info->act_page % id->pages_per_area) == 0) { |
|
/* next area */ |
|
p_info->act_area++; |
|
p_info->act_page = 0; |
|
} |
|
if (p_info->act_area >= id->nr_areas) |
|
return 1; |
|
} |
|
out: |
|
return 0; |
|
} |
|
|
|
/* |
|
* debug_output: |
|
* - called for user read() |
|
* - copies formated debug entries to the user buffer |
|
*/ |
|
static ssize_t debug_output(struct file *file, /* file descriptor */ |
|
char __user *user_buf, /* user buffer */ |
|
size_t len, /* length of buffer */ |
|
loff_t *offset) /* offset in the file */ |
|
{ |
|
size_t count = 0; |
|
size_t entry_offset; |
|
file_private_info_t *p_info; |
|
|
|
p_info = (file_private_info_t *) file->private_data; |
|
if (*offset != p_info->offset) |
|
return -EPIPE; |
|
if (p_info->act_area >= p_info->debug_info_snap->nr_areas) |
|
return 0; |
|
entry_offset = p_info->act_entry_offset; |
|
while (count < len) { |
|
int formatted_line_residue; |
|
int formatted_line_size; |
|
int user_buf_residue; |
|
size_t copy_size; |
|
|
|
formatted_line_size = debug_format_entry(p_info); |
|
formatted_line_residue = formatted_line_size - entry_offset; |
|
user_buf_residue = len-count; |
|
copy_size = min(user_buf_residue, formatted_line_residue); |
|
if (copy_size) { |
|
if (copy_to_user(user_buf + count, p_info->temp_buf |
|
+ entry_offset, copy_size)) |
|
return -EFAULT; |
|
count += copy_size; |
|
entry_offset += copy_size; |
|
} |
|
if (copy_size == formatted_line_residue) { |
|
entry_offset = 0; |
|
if (debug_next_entry(p_info)) |
|
goto out; |
|
} |
|
} |
|
out: |
|
p_info->offset = *offset + count; |
|
p_info->act_entry_offset = entry_offset; |
|
*offset = p_info->offset; |
|
return count; |
|
} |
|
|
|
/* |
|
* debug_input: |
|
* - called for user write() |
|
* - calls input function of view |
|
*/ |
|
static ssize_t debug_input(struct file *file, const char __user *user_buf, |
|
size_t length, loff_t *offset) |
|
{ |
|
file_private_info_t *p_info; |
|
int rc = 0; |
|
|
|
mutex_lock(&debug_mutex); |
|
p_info = ((file_private_info_t *) file->private_data); |
|
if (p_info->view->input_proc) { |
|
rc = p_info->view->input_proc(p_info->debug_info_org, |
|
p_info->view, file, user_buf, |
|
length, offset); |
|
} else { |
|
rc = -EPERM; |
|
} |
|
mutex_unlock(&debug_mutex); |
|
return rc; /* number of input characters */ |
|
} |
|
|
|
/* |
|
* debug_open: |
|
* - called for user open() |
|
* - copies formated output to private_data area of the file |
|
* handle |
|
*/ |
|
static int debug_open(struct inode *inode, struct file *file) |
|
{ |
|
debug_info_t *debug_info, *debug_info_snapshot; |
|
file_private_info_t *p_info; |
|
int i, rc = 0; |
|
|
|
mutex_lock(&debug_mutex); |
|
debug_info = file_inode(file)->i_private; |
|
/* find debug view */ |
|
for (i = 0; i < DEBUG_MAX_VIEWS; i++) { |
|
if (!debug_info->views[i]) |
|
continue; |
|
else if (debug_info->debugfs_entries[i] == file->f_path.dentry) |
|
goto found; /* found view ! */ |
|
} |
|
/* no entry found */ |
|
rc = -EINVAL; |
|
goto out; |
|
|
|
found: |
|
|
|
/* Make snapshot of current debug areas to get it consistent. */ |
|
/* To copy all the areas is only needed, if we have a view which */ |
|
/* formats the debug areas. */ |
|
|
|
if (!debug_info->views[i]->format_proc && !debug_info->views[i]->header_proc) |
|
debug_info_snapshot = debug_info_copy(debug_info, NO_AREAS); |
|
else |
|
debug_info_snapshot = debug_info_copy(debug_info, ALL_AREAS); |
|
|
|
if (!debug_info_snapshot) { |
|
rc = -ENOMEM; |
|
goto out; |
|
} |
|
p_info = kmalloc(sizeof(file_private_info_t), GFP_KERNEL); |
|
if (!p_info) { |
|
debug_info_free(debug_info_snapshot); |
|
rc = -ENOMEM; |
|
goto out; |
|
} |
|
p_info->offset = 0; |
|
p_info->debug_info_snap = debug_info_snapshot; |
|
p_info->debug_info_org = debug_info; |
|
p_info->view = debug_info->views[i]; |
|
p_info->act_area = 0; |
|
p_info->act_page = 0; |
|
p_info->act_entry = DEBUG_PROLOG_ENTRY; |
|
p_info->act_entry_offset = 0; |
|
file->private_data = p_info; |
|
debug_info_get(debug_info); |
|
nonseekable_open(inode, file); |
|
out: |
|
mutex_unlock(&debug_mutex); |
|
return rc; |
|
} |
|
|
|
/* |
|
* debug_close: |
|
* - called for user close() |
|
* - deletes private_data area of the file handle |
|
*/ |
|
static int debug_close(struct inode *inode, struct file *file) |
|
{ |
|
file_private_info_t *p_info; |
|
|
|
p_info = (file_private_info_t *) file->private_data; |
|
if (p_info->debug_info_snap) |
|
debug_info_free(p_info->debug_info_snap); |
|
debug_info_put(p_info->debug_info_org); |
|
kfree(file->private_data); |
|
return 0; /* success */ |
|
} |
|
|
|
/** |
|
* debug_register_mode() - creates and initializes debug area. |
|
* |
|
* @name: Name of debug log (e.g. used for debugfs entry) |
|
* @pages_per_area: Number of pages, which will be allocated per area |
|
* @nr_areas: Number of debug areas |
|
* @buf_size: Size of data area in each debug entry |
|
* @mode: File mode for debugfs files. E.g. S_IRWXUGO |
|
* @uid: User ID for debugfs files. Currently only 0 is supported. |
|
* @gid: Group ID for debugfs files. Currently only 0 is supported. |
|
* |
|
* Return: |
|
* - Handle for generated debug area |
|
* - %NULL if register failed |
|
* |
|
* Allocates memory for a debug log. |
|
* Must not be called within an interrupt handler. |
|
*/ |
|
debug_info_t *debug_register_mode(const char *name, int pages_per_area, |
|
int nr_areas, int buf_size, umode_t mode, |
|
uid_t uid, gid_t gid) |
|
{ |
|
debug_info_t *rc = NULL; |
|
|
|
/* Since debugfs currently does not support uid/gid other than root, */ |
|
/* we do not allow gid/uid != 0 until we get support for that. */ |
|
if ((uid != 0) || (gid != 0)) |
|
pr_warn("Root becomes the owner of all s390dbf files in sysfs\n"); |
|
BUG_ON(!initialized); |
|
mutex_lock(&debug_mutex); |
|
|
|
/* create new debug_info */ |
|
rc = debug_info_create(name, pages_per_area, nr_areas, buf_size, mode); |
|
if (!rc) |
|
goto out; |
|
debug_register_view(rc, &debug_level_view); |
|
debug_register_view(rc, &debug_flush_view); |
|
debug_register_view(rc, &debug_pages_view); |
|
out: |
|
if (!rc) |
|
pr_err("Registering debug feature %s failed\n", name); |
|
mutex_unlock(&debug_mutex); |
|
return rc; |
|
} |
|
EXPORT_SYMBOL(debug_register_mode); |
|
|
|
/** |
|
* debug_register() - creates and initializes debug area with default file mode. |
|
* |
|
* @name: Name of debug log (e.g. used for debugfs entry) |
|
* @pages_per_area: Number of pages, which will be allocated per area |
|
* @nr_areas: Number of debug areas |
|
* @buf_size: Size of data area in each debug entry |
|
* |
|
* Return: |
|
* - Handle for generated debug area |
|
* - %NULL if register failed |
|
* |
|
* Allocates memory for a debug log. |
|
* The debugfs file mode access permissions are read and write for user. |
|
* Must not be called within an interrupt handler. |
|
*/ |
|
debug_info_t *debug_register(const char *name, int pages_per_area, |
|
int nr_areas, int buf_size) |
|
{ |
|
return debug_register_mode(name, pages_per_area, nr_areas, buf_size, |
|
S_IRUSR | S_IWUSR, 0, 0); |
|
} |
|
EXPORT_SYMBOL(debug_register); |
|
|
|
/** |
|
* debug_unregister() - give back debug area. |
|
* |
|
* @id: handle for debug log |
|
* |
|
* Return: |
|
* none |
|
*/ |
|
void debug_unregister(debug_info_t *id) |
|
{ |
|
if (!id) |
|
return; |
|
mutex_lock(&debug_mutex); |
|
debug_info_put(id); |
|
mutex_unlock(&debug_mutex); |
|
} |
|
EXPORT_SYMBOL(debug_unregister); |
|
|
|
/* |
|
* debug_set_size: |
|
* - set area size (number of pages) and number of areas |
|
*/ |
|
static int debug_set_size(debug_info_t *id, int nr_areas, int pages_per_area) |
|
{ |
|
debug_entry_t ***new_areas; |
|
unsigned long flags; |
|
int rc = 0; |
|
|
|
if (!id || (nr_areas <= 0) || (pages_per_area < 0)) |
|
return -EINVAL; |
|
if (pages_per_area > 0) { |
|
new_areas = debug_areas_alloc(pages_per_area, nr_areas); |
|
if (!new_areas) { |
|
pr_info("Allocating memory for %i pages failed\n", |
|
pages_per_area); |
|
rc = -ENOMEM; |
|
goto out; |
|
} |
|
} else { |
|
new_areas = NULL; |
|
} |
|
spin_lock_irqsave(&id->lock, flags); |
|
debug_areas_free(id); |
|
id->areas = new_areas; |
|
id->nr_areas = nr_areas; |
|
id->pages_per_area = pages_per_area; |
|
id->active_area = 0; |
|
memset(id->active_entries, 0, sizeof(int)*id->nr_areas); |
|
memset(id->active_pages, 0, sizeof(int)*id->nr_areas); |
|
spin_unlock_irqrestore(&id->lock, flags); |
|
pr_info("%s: set new size (%i pages)\n", id->name, pages_per_area); |
|
out: |
|
return rc; |
|
} |
|
|
|
/** |
|
* debug_set_level() - Sets new actual debug level if new_level is valid. |
|
* |
|
* @id: handle for debug log |
|
* @new_level: new debug level |
|
* |
|
* Return: |
|
* none |
|
*/ |
|
void debug_set_level(debug_info_t *id, int new_level) |
|
{ |
|
unsigned long flags; |
|
|
|
if (!id) |
|
return; |
|
spin_lock_irqsave(&id->lock, flags); |
|
if (new_level == DEBUG_OFF_LEVEL) { |
|
id->level = DEBUG_OFF_LEVEL; |
|
pr_info("%s: switched off\n", id->name); |
|
} else if ((new_level > DEBUG_MAX_LEVEL) || (new_level < 0)) { |
|
pr_info("%s: level %i is out of range (%i - %i)\n", |
|
id->name, new_level, 0, DEBUG_MAX_LEVEL); |
|
} else { |
|
id->level = new_level; |
|
} |
|
spin_unlock_irqrestore(&id->lock, flags); |
|
} |
|
EXPORT_SYMBOL(debug_set_level); |
|
|
|
/* |
|
* proceed_active_entry: |
|
* - set active entry to next in the ring buffer |
|
*/ |
|
static inline void proceed_active_entry(debug_info_t *id) |
|
{ |
|
if ((id->active_entries[id->active_area] += id->entry_size) |
|
> (PAGE_SIZE - id->entry_size)) { |
|
id->active_entries[id->active_area] = 0; |
|
id->active_pages[id->active_area] = |
|
(id->active_pages[id->active_area] + 1) % |
|
id->pages_per_area; |
|
} |
|
} |
|
|
|
/* |
|
* proceed_active_area: |
|
* - set active area to next in the ring buffer |
|
*/ |
|
static inline void proceed_active_area(debug_info_t *id) |
|
{ |
|
id->active_area++; |
|
id->active_area = id->active_area % id->nr_areas; |
|
} |
|
|
|
/* |
|
* get_active_entry: |
|
*/ |
|
static inline debug_entry_t *get_active_entry(debug_info_t *id) |
|
{ |
|
return (debug_entry_t *) (((char *) id->areas[id->active_area] |
|
[id->active_pages[id->active_area]]) + |
|
id->active_entries[id->active_area]); |
|
} |
|
|
|
/* |
|
* debug_finish_entry: |
|
* - set timestamp, caller address, cpu number etc. |
|
*/ |
|
|
|
static inline void debug_finish_entry(debug_info_t *id, debug_entry_t *active, |
|
int level, int exception) |
|
{ |
|
unsigned long timestamp; |
|
union tod_clock clk; |
|
|
|
store_tod_clock_ext(&clk); |
|
timestamp = clk.us; |
|
timestamp -= TOD_UNIX_EPOCH >> 12; |
|
active->clock = timestamp; |
|
active->cpu = smp_processor_id(); |
|
active->caller = __builtin_return_address(0); |
|
active->exception = exception; |
|
active->level = level; |
|
proceed_active_entry(id); |
|
if (exception) |
|
proceed_active_area(id); |
|
} |
|
|
|
static int debug_stoppable = 1; |
|
static int debug_active = 1; |
|
|
|
#define CTL_S390DBF_STOPPABLE 5678 |
|
#define CTL_S390DBF_ACTIVE 5679 |
|
|
|
/* |
|
* proc handler for the running debug_active sysctl |
|
* always allow read, allow write only if debug_stoppable is set or |
|
* if debug_active is already off |
|
*/ |
|
static int s390dbf_procactive(struct ctl_table *table, int write, |
|
void *buffer, size_t *lenp, loff_t *ppos) |
|
{ |
|
if (!write || debug_stoppable || !debug_active) |
|
return proc_dointvec(table, write, buffer, lenp, ppos); |
|
else |
|
return 0; |
|
} |
|
|
|
static struct ctl_table s390dbf_table[] = { |
|
{ |
|
.procname = "debug_stoppable", |
|
.data = &debug_stoppable, |
|
.maxlen = sizeof(int), |
|
.mode = S_IRUGO | S_IWUSR, |
|
.proc_handler = proc_dointvec, |
|
}, |
|
{ |
|
.procname = "debug_active", |
|
.data = &debug_active, |
|
.maxlen = sizeof(int), |
|
.mode = S_IRUGO | S_IWUSR, |
|
.proc_handler = s390dbf_procactive, |
|
}, |
|
{ } |
|
}; |
|
|
|
static struct ctl_table s390dbf_dir_table[] = { |
|
{ |
|
.procname = "s390dbf", |
|
.maxlen = 0, |
|
.mode = S_IRUGO | S_IXUGO, |
|
.child = s390dbf_table, |
|
}, |
|
{ } |
|
}; |
|
|
|
static struct ctl_table_header *s390dbf_sysctl_header; |
|
|
|
/** |
|
* debug_stop_all() - stops the debug feature if stopping is allowed. |
|
* |
|
* Return: |
|
* - none |
|
* |
|
* Currently used in case of a kernel oops. |
|
*/ |
|
void debug_stop_all(void) |
|
{ |
|
if (debug_stoppable) |
|
debug_active = 0; |
|
} |
|
EXPORT_SYMBOL(debug_stop_all); |
|
|
|
/** |
|
* debug_set_critical() - event/exception functions try lock instead of spin. |
|
* |
|
* Return: |
|
* - none |
|
* |
|
* Currently used in case of stopping all CPUs but the current one. |
|
* Once in this state, functions to write a debug entry for an |
|
* event or exception no longer spin on the debug area lock, |
|
* but only try to get it and fail if they do not get the lock. |
|
*/ |
|
void debug_set_critical(void) |
|
{ |
|
debug_critical = 1; |
|
} |
|
|
|
/* |
|
* debug_event_common: |
|
* - write debug entry with given size |
|
*/ |
|
debug_entry_t *debug_event_common(debug_info_t *id, int level, const void *buf, |
|
int len) |
|
{ |
|
debug_entry_t *active; |
|
unsigned long flags; |
|
|
|
if (!debug_active || !id->areas) |
|
return NULL; |
|
if (debug_critical) { |
|
if (!spin_trylock_irqsave(&id->lock, flags)) |
|
return NULL; |
|
} else { |
|
spin_lock_irqsave(&id->lock, flags); |
|
} |
|
do { |
|
active = get_active_entry(id); |
|
memcpy(DEBUG_DATA(active), buf, min(len, id->buf_size)); |
|
if (len < id->buf_size) |
|
memset((DEBUG_DATA(active)) + len, 0, id->buf_size - len); |
|
debug_finish_entry(id, active, level, 0); |
|
len -= id->buf_size; |
|
buf += id->buf_size; |
|
} while (len > 0); |
|
|
|
spin_unlock_irqrestore(&id->lock, flags); |
|
return active; |
|
} |
|
EXPORT_SYMBOL(debug_event_common); |
|
|
|
/* |
|
* debug_exception_common: |
|
* - write debug entry with given size and switch to next debug area |
|
*/ |
|
debug_entry_t *debug_exception_common(debug_info_t *id, int level, |
|
const void *buf, int len) |
|
{ |
|
debug_entry_t *active; |
|
unsigned long flags; |
|
|
|
if (!debug_active || !id->areas) |
|
return NULL; |
|
if (debug_critical) { |
|
if (!spin_trylock_irqsave(&id->lock, flags)) |
|
return NULL; |
|
} else { |
|
spin_lock_irqsave(&id->lock, flags); |
|
} |
|
do { |
|
active = get_active_entry(id); |
|
memcpy(DEBUG_DATA(active), buf, min(len, id->buf_size)); |
|
if (len < id->buf_size) |
|
memset((DEBUG_DATA(active)) + len, 0, id->buf_size - len); |
|
debug_finish_entry(id, active, level, len <= id->buf_size); |
|
len -= id->buf_size; |
|
buf += id->buf_size; |
|
} while (len > 0); |
|
|
|
spin_unlock_irqrestore(&id->lock, flags); |
|
return active; |
|
} |
|
EXPORT_SYMBOL(debug_exception_common); |
|
|
|
/* |
|
* counts arguments in format string for sprintf view |
|
*/ |
|
static inline int debug_count_numargs(char *string) |
|
{ |
|
int numargs = 0; |
|
|
|
while (*string) { |
|
if (*string++ == '%') |
|
numargs++; |
|
} |
|
return numargs; |
|
} |
|
|
|
/* |
|
* debug_sprintf_event: |
|
*/ |
|
debug_entry_t *__debug_sprintf_event(debug_info_t *id, int level, char *string, ...) |
|
{ |
|
debug_sprintf_entry_t *curr_event; |
|
debug_entry_t *active; |
|
unsigned long flags; |
|
int numargs, idx; |
|
va_list ap; |
|
|
|
if (!debug_active || !id->areas) |
|
return NULL; |
|
numargs = debug_count_numargs(string); |
|
|
|
if (debug_critical) { |
|
if (!spin_trylock_irqsave(&id->lock, flags)) |
|
return NULL; |
|
} else { |
|
spin_lock_irqsave(&id->lock, flags); |
|
} |
|
active = get_active_entry(id); |
|
curr_event = (debug_sprintf_entry_t *) DEBUG_DATA(active); |
|
va_start(ap, string); |
|
curr_event->string = string; |
|
for (idx = 0; idx < min(numargs, (int)(id->buf_size / sizeof(long)) - 1); idx++) |
|
curr_event->args[idx] = va_arg(ap, long); |
|
va_end(ap); |
|
debug_finish_entry(id, active, level, 0); |
|
spin_unlock_irqrestore(&id->lock, flags); |
|
|
|
return active; |
|
} |
|
EXPORT_SYMBOL(__debug_sprintf_event); |
|
|
|
/* |
|
* debug_sprintf_exception: |
|
*/ |
|
debug_entry_t *__debug_sprintf_exception(debug_info_t *id, int level, char *string, ...) |
|
{ |
|
debug_sprintf_entry_t *curr_event; |
|
debug_entry_t *active; |
|
unsigned long flags; |
|
int numargs, idx; |
|
va_list ap; |
|
|
|
if (!debug_active || !id->areas) |
|
return NULL; |
|
|
|
numargs = debug_count_numargs(string); |
|
|
|
if (debug_critical) { |
|
if (!spin_trylock_irqsave(&id->lock, flags)) |
|
return NULL; |
|
} else { |
|
spin_lock_irqsave(&id->lock, flags); |
|
} |
|
active = get_active_entry(id); |
|
curr_event = (debug_sprintf_entry_t *)DEBUG_DATA(active); |
|
va_start(ap, string); |
|
curr_event->string = string; |
|
for (idx = 0; idx < min(numargs, (int)(id->buf_size / sizeof(long)) - 1); idx++) |
|
curr_event->args[idx] = va_arg(ap, long); |
|
va_end(ap); |
|
debug_finish_entry(id, active, level, 1); |
|
spin_unlock_irqrestore(&id->lock, flags); |
|
|
|
return active; |
|
} |
|
EXPORT_SYMBOL(__debug_sprintf_exception); |
|
|
|
/** |
|
* debug_register_view() - registers new debug view and creates debugfs |
|
* dir entry |
|
* |
|
* @id: handle for debug log |
|
* @view: pointer to debug view struct |
|
* |
|
* Return: |
|
* - 0 : ok |
|
* - < 0: Error |
|
*/ |
|
int debug_register_view(debug_info_t *id, struct debug_view *view) |
|
{ |
|
unsigned long flags; |
|
struct dentry *pde; |
|
umode_t mode; |
|
int rc = 0; |
|
int i; |
|
|
|
if (!id) |
|
goto out; |
|
mode = (id->mode | S_IFREG) & ~S_IXUGO; |
|
if (!(view->prolog_proc || view->format_proc || view->header_proc)) |
|
mode &= ~(S_IRUSR | S_IRGRP | S_IROTH); |
|
if (!view->input_proc) |
|
mode &= ~(S_IWUSR | S_IWGRP | S_IWOTH); |
|
pde = debugfs_create_file(view->name, mode, id->debugfs_root_entry, |
|
id, &debug_file_ops); |
|
spin_lock_irqsave(&id->lock, flags); |
|
for (i = 0; i < DEBUG_MAX_VIEWS; i++) { |
|
if (!id->views[i]) |
|
break; |
|
} |
|
if (i == DEBUG_MAX_VIEWS) { |
|
pr_err("Registering view %s/%s would exceed the maximum " |
|
"number of views %i\n", id->name, view->name, i); |
|
rc = -1; |
|
} else { |
|
id->views[i] = view; |
|
id->debugfs_entries[i] = pde; |
|
} |
|
spin_unlock_irqrestore(&id->lock, flags); |
|
if (rc) |
|
debugfs_remove(pde); |
|
out: |
|
return rc; |
|
} |
|
EXPORT_SYMBOL(debug_register_view); |
|
|
|
/** |
|
* debug_unregister_view() - unregisters debug view and removes debugfs |
|
* dir entry |
|
* |
|
* @id: handle for debug log |
|
* @view: pointer to debug view struct |
|
* |
|
* Return: |
|
* - 0 : ok |
|
* - < 0: Error |
|
*/ |
|
int debug_unregister_view(debug_info_t *id, struct debug_view *view) |
|
{ |
|
struct dentry *dentry = NULL; |
|
unsigned long flags; |
|
int i, rc = 0; |
|
|
|
if (!id) |
|
goto out; |
|
spin_lock_irqsave(&id->lock, flags); |
|
for (i = 0; i < DEBUG_MAX_VIEWS; i++) { |
|
if (id->views[i] == view) |
|
break; |
|
} |
|
if (i == DEBUG_MAX_VIEWS) { |
|
rc = -1; |
|
} else { |
|
dentry = id->debugfs_entries[i]; |
|
id->views[i] = NULL; |
|
id->debugfs_entries[i] = NULL; |
|
} |
|
spin_unlock_irqrestore(&id->lock, flags); |
|
debugfs_remove(dentry); |
|
out: |
|
return rc; |
|
} |
|
EXPORT_SYMBOL(debug_unregister_view); |
|
|
|
static inline char *debug_get_user_string(const char __user *user_buf, |
|
size_t user_len) |
|
{ |
|
char *buffer; |
|
|
|
buffer = kmalloc(user_len + 1, GFP_KERNEL); |
|
if (!buffer) |
|
return ERR_PTR(-ENOMEM); |
|
if (copy_from_user(buffer, user_buf, user_len) != 0) { |
|
kfree(buffer); |
|
return ERR_PTR(-EFAULT); |
|
} |
|
/* got the string, now strip linefeed. */ |
|
if (buffer[user_len - 1] == '\n') |
|
buffer[user_len - 1] = 0; |
|
else |
|
buffer[user_len] = 0; |
|
return buffer; |
|
} |
|
|
|
static inline int debug_get_uint(char *buf) |
|
{ |
|
int rc; |
|
|
|
buf = skip_spaces(buf); |
|
rc = simple_strtoul(buf, &buf, 10); |
|
if (*buf) |
|
rc = -EINVAL; |
|
return rc; |
|
} |
|
|
|
/* |
|
* functions for debug-views |
|
*********************************** |
|
*/ |
|
|
|
/* |
|
* prints out actual debug level |
|
*/ |
|
|
|
static int debug_prolog_pages_fn(debug_info_t *id, struct debug_view *view, |
|
char *out_buf) |
|
{ |
|
return sprintf(out_buf, "%i\n", id->pages_per_area); |
|
} |
|
|
|
/* |
|
* reads new size (number of pages per debug area) |
|
*/ |
|
|
|
static int debug_input_pages_fn(debug_info_t *id, struct debug_view *view, |
|
struct file *file, const char __user *user_buf, |
|
size_t user_len, loff_t *offset) |
|
{ |
|
int rc, new_pages; |
|
char *str; |
|
|
|
if (user_len > 0x10000) |
|
user_len = 0x10000; |
|
if (*offset != 0) { |
|
rc = -EPIPE; |
|
goto out; |
|
} |
|
str = debug_get_user_string(user_buf, user_len); |
|
if (IS_ERR(str)) { |
|
rc = PTR_ERR(str); |
|
goto out; |
|
} |
|
new_pages = debug_get_uint(str); |
|
if (new_pages < 0) { |
|
rc = -EINVAL; |
|
goto free_str; |
|
} |
|
rc = debug_set_size(id, id->nr_areas, new_pages); |
|
if (rc != 0) { |
|
rc = -EINVAL; |
|
goto free_str; |
|
} |
|
rc = user_len; |
|
free_str: |
|
kfree(str); |
|
out: |
|
*offset += user_len; |
|
return rc; /* number of input characters */ |
|
} |
|
|
|
/* |
|
* prints out actual debug level |
|
*/ |
|
static int debug_prolog_level_fn(debug_info_t *id, struct debug_view *view, |
|
char *out_buf) |
|
{ |
|
int rc = 0; |
|
|
|
if (id->level == DEBUG_OFF_LEVEL) |
|
rc = sprintf(out_buf, "-\n"); |
|
else |
|
rc = sprintf(out_buf, "%i\n", id->level); |
|
return rc; |
|
} |
|
|
|
/* |
|
* reads new debug level |
|
*/ |
|
static int debug_input_level_fn(debug_info_t *id, struct debug_view *view, |
|
struct file *file, const char __user *user_buf, |
|
size_t user_len, loff_t *offset) |
|
{ |
|
int rc, new_level; |
|
char *str; |
|
|
|
if (user_len > 0x10000) |
|
user_len = 0x10000; |
|
if (*offset != 0) { |
|
rc = -EPIPE; |
|
goto out; |
|
} |
|
str = debug_get_user_string(user_buf, user_len); |
|
if (IS_ERR(str)) { |
|
rc = PTR_ERR(str); |
|
goto out; |
|
} |
|
if (str[0] == '-') { |
|
debug_set_level(id, DEBUG_OFF_LEVEL); |
|
rc = user_len; |
|
goto free_str; |
|
} else { |
|
new_level = debug_get_uint(str); |
|
} |
|
if (new_level < 0) { |
|
pr_warn("%s is not a valid level for a debug feature\n", str); |
|
rc = -EINVAL; |
|
} else { |
|
debug_set_level(id, new_level); |
|
rc = user_len; |
|
} |
|
free_str: |
|
kfree(str); |
|
out: |
|
*offset += user_len; |
|
return rc; /* number of input characters */ |
|
} |
|
|
|
/* |
|
* flushes debug areas |
|
*/ |
|
static void debug_flush(debug_info_t *id, int area) |
|
{ |
|
unsigned long flags; |
|
int i, j; |
|
|
|
if (!id || !id->areas) |
|
return; |
|
spin_lock_irqsave(&id->lock, flags); |
|
if (area == DEBUG_FLUSH_ALL) { |
|
id->active_area = 0; |
|
memset(id->active_entries, 0, id->nr_areas * sizeof(int)); |
|
for (i = 0; i < id->nr_areas; i++) { |
|
id->active_pages[i] = 0; |
|
for (j = 0; j < id->pages_per_area; j++) |
|
memset(id->areas[i][j], 0, PAGE_SIZE); |
|
} |
|
} else if (area >= 0 && area < id->nr_areas) { |
|
id->active_entries[area] = 0; |
|
id->active_pages[area] = 0; |
|
for (i = 0; i < id->pages_per_area; i++) |
|
memset(id->areas[area][i], 0, PAGE_SIZE); |
|
} |
|
spin_unlock_irqrestore(&id->lock, flags); |
|
} |
|
|
|
/* |
|
* view function: flushes debug areas |
|
*/ |
|
static int debug_input_flush_fn(debug_info_t *id, struct debug_view *view, |
|
struct file *file, const char __user *user_buf, |
|
size_t user_len, loff_t *offset) |
|
{ |
|
char input_buf[1]; |
|
int rc = user_len; |
|
|
|
if (user_len > 0x10000) |
|
user_len = 0x10000; |
|
if (*offset != 0) { |
|
rc = -EPIPE; |
|
goto out; |
|
} |
|
if (copy_from_user(input_buf, user_buf, 1)) { |
|
rc = -EFAULT; |
|
goto out; |
|
} |
|
if (input_buf[0] == '-') { |
|
debug_flush(id, DEBUG_FLUSH_ALL); |
|
goto out; |
|
} |
|
if (isdigit(input_buf[0])) { |
|
int area = ((int) input_buf[0] - (int) '0'); |
|
|
|
debug_flush(id, area); |
|
goto out; |
|
} |
|
|
|
pr_info("Flushing debug data failed because %c is not a valid " |
|
"area\n", input_buf[0]); |
|
|
|
out: |
|
*offset += user_len; |
|
return rc; /* number of input characters */ |
|
} |
|
|
|
/* |
|
* prints debug data in hex/ascii format |
|
*/ |
|
static int debug_hex_ascii_format_fn(debug_info_t *id, struct debug_view *view, |
|
char *out_buf, const char *in_buf) |
|
{ |
|
int i, rc = 0; |
|
|
|
for (i = 0; i < id->buf_size; i++) |
|
rc += sprintf(out_buf + rc, "%02x ", ((unsigned char *) in_buf)[i]); |
|
rc += sprintf(out_buf + rc, "| "); |
|
for (i = 0; i < id->buf_size; i++) { |
|
unsigned char c = in_buf[i]; |
|
|
|
if (isascii(c) && isprint(c)) |
|
rc += sprintf(out_buf + rc, "%c", c); |
|
else |
|
rc += sprintf(out_buf + rc, "."); |
|
} |
|
rc += sprintf(out_buf + rc, "\n"); |
|
return rc; |
|
} |
|
|
|
/* |
|
* prints header for debug entry |
|
*/ |
|
int debug_dflt_header_fn(debug_info_t *id, struct debug_view *view, |
|
int area, debug_entry_t *entry, char *out_buf) |
|
{ |
|
unsigned long sec, usec; |
|
unsigned long caller; |
|
unsigned int level; |
|
char *except_str; |
|
int rc = 0; |
|
|
|
level = entry->level; |
|
sec = entry->clock; |
|
usec = do_div(sec, USEC_PER_SEC); |
|
|
|
if (entry->exception) |
|
except_str = "*"; |
|
else |
|
except_str = "-"; |
|
caller = (unsigned long) entry->caller; |
|
rc += sprintf(out_buf, "%02i %011ld:%06lu %1u %1s %04u %pK ", |
|
area, sec, usec, level, except_str, |
|
entry->cpu, (void *)caller); |
|
return rc; |
|
} |
|
EXPORT_SYMBOL(debug_dflt_header_fn); |
|
|
|
/* |
|
* prints debug data sprintf-formated: |
|
* debug_sprinf_event/exception calls must be used together with this view |
|
*/ |
|
|
|
#define DEBUG_SPRINTF_MAX_ARGS 10 |
|
|
|
static int debug_sprintf_format_fn(debug_info_t *id, struct debug_view *view, |
|
char *out_buf, debug_sprintf_entry_t *curr_event) |
|
{ |
|
int num_longs, num_used_args = 0, i, rc = 0; |
|
int index[DEBUG_SPRINTF_MAX_ARGS]; |
|
|
|
/* count of longs fit into one entry */ |
|
num_longs = id->buf_size / sizeof(long); |
|
|
|
if (num_longs < 1) |
|
goto out; /* bufsize of entry too small */ |
|
if (num_longs == 1) { |
|
/* no args, we use only the string */ |
|
strcpy(out_buf, curr_event->string); |
|
rc = strlen(curr_event->string); |
|
goto out; |
|
} |
|
|
|
/* number of arguments used for sprintf (without the format string) */ |
|
num_used_args = min(DEBUG_SPRINTF_MAX_ARGS, (num_longs - 1)); |
|
|
|
memset(index, 0, DEBUG_SPRINTF_MAX_ARGS * sizeof(int)); |
|
|
|
for (i = 0; i < num_used_args; i++) |
|
index[i] = i; |
|
|
|
rc = sprintf(out_buf, curr_event->string, curr_event->args[index[0]], |
|
curr_event->args[index[1]], curr_event->args[index[2]], |
|
curr_event->args[index[3]], curr_event->args[index[4]], |
|
curr_event->args[index[5]], curr_event->args[index[6]], |
|
curr_event->args[index[7]], curr_event->args[index[8]], |
|
curr_event->args[index[9]]); |
|
out: |
|
return rc; |
|
} |
|
|
|
/* |
|
* debug_init: |
|
* - is called exactly once to initialize the debug feature |
|
*/ |
|
static int __init debug_init(void) |
|
{ |
|
s390dbf_sysctl_header = register_sysctl_table(s390dbf_dir_table); |
|
mutex_lock(&debug_mutex); |
|
debug_debugfs_root_entry = debugfs_create_dir(DEBUG_DIR_ROOT, NULL); |
|
initialized = 1; |
|
mutex_unlock(&debug_mutex); |
|
return 0; |
|
} |
|
postcore_initcall(debug_init);
|
|
|