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Diffstat (limited to 'arch/s390/kernel/debug.c')
-rw-r--r--arch/s390/kernel/debug.c134
1 files changed, 67 insertions, 67 deletions
diff --git a/arch/s390/kernel/debug.c b/arch/s390/kernel/debug.c
index 5ad6bc078bf..ee8390da6ea 100644
--- a/arch/s390/kernel/debug.c
+++ b/arch/s390/kernel/debug.c
@@ -1,9 +1,8 @@
/*
- * arch/s390/kernel/debug.c
* S/390 debug facility
*
- * Copyright (C) 1999, 2000 IBM Deutschland Entwicklung GmbH,
- * IBM Corporation
+ * Copyright IBM Corp. 1999, 2012
+ *
* Author(s): Michael Holzheu (holzheu@de.ibm.com),
* Holger Smolinski (Holger.Smolinski@de.ibm.com)
*
@@ -74,7 +73,7 @@ static ssize_t debug_input(struct file *file, const char __user *user_buf,
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, mode_t mode);
+ 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,
@@ -111,6 +110,7 @@ struct debug_view debug_raw_view = {
NULL,
NULL
};
+EXPORT_SYMBOL(debug_raw_view);
struct debug_view debug_hex_ascii_view = {
"hex_ascii",
@@ -120,6 +120,7 @@ struct debug_view debug_hex_ascii_view = {
NULL,
NULL
};
+EXPORT_SYMBOL(debug_hex_ascii_view);
static struct debug_view debug_level_view = {
"level",
@@ -156,6 +157,7 @@ struct debug_view debug_sprintf_view = {
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;
@@ -167,6 +169,7 @@ static debug_info_t *debug_area_last = NULL;
static DEFINE_MUTEX(debug_mutex);
static int initialized;
+static int debug_critical;
static const struct file_operations debug_file_ops = {
.owner = THIS_MODULE,
@@ -330,7 +333,7 @@ debug_info_free(debug_info_t* db_info){
static debug_info_t*
debug_info_create(const char *name, int pages_per_area, int nr_areas,
- int buf_size, mode_t mode)
+ int buf_size, umode_t mode)
{
debug_info_t* rc;
@@ -608,7 +611,7 @@ debug_open(struct inode *inode, struct file *file)
debug_info_t *debug_info, *debug_info_snapshot;
mutex_lock(&debug_mutex);
- debug_info = file->f_path.dentry->d_inode->i_private;
+ debug_info = file_inode(file)->i_private;
/* find debug view */
for (i = 0; i < DEBUG_MAX_VIEWS; i++) {
if (!debug_info->views[i])
@@ -688,7 +691,7 @@ debug_close(struct inode *inode, struct file *file)
*/
debug_info_t *debug_register_mode(const char *name, int pages_per_area,
- int nr_areas, int buf_size, mode_t mode,
+ int nr_areas, int buf_size, umode_t mode,
uid_t uid, gid_t gid)
{
debug_info_t *rc = NULL;
@@ -730,6 +733,7 @@ debug_info_t *debug_register(const char *name, int pages_per_area,
return debug_register_mode(name, pages_per_area, nr_areas, buf_size,
S_IRUSR | S_IWUSR, 0, 0);
}
+EXPORT_SYMBOL(debug_register);
/*
* debug_unregister:
@@ -748,6 +752,7 @@ debug_unregister(debug_info_t * id)
out:
return;
}
+EXPORT_SYMBOL(debug_unregister);
/*
* debug_set_size:
@@ -810,7 +815,7 @@ debug_set_level(debug_info_t* id, int new_level)
}
spin_unlock_irqrestore(&id->lock,flags);
}
-
+EXPORT_SYMBOL(debug_set_level);
/*
* proceed_active_entry:
@@ -862,7 +867,7 @@ static inline void
debug_finish_entry(debug_info_t * id, debug_entry_t* active, int level,
int exception)
{
- active->id.stck = get_clock();
+ active->id.stck = get_tod_clock_fast();
active->id.fields.cpuid = smp_processor_id();
active->caller = __builtin_return_address(0);
active->id.fields.exception = exception;
@@ -884,7 +889,7 @@ static int debug_active=1;
* if debug_active is already off
*/
static int
-s390dbf_procactive(ctl_table *table, int write,
+s390dbf_procactive(struct ctl_table *table, int write,
void __user *buffer, size_t *lenp, loff_t *ppos)
{
if (!write || debug_stoppable || !debug_active)
@@ -930,7 +935,12 @@ debug_stop_all(void)
if (debug_stoppable)
debug_active = 0;
}
+EXPORT_SYMBOL(debug_stop_all);
+void debug_set_critical(void)
+{
+ debug_critical = 1;
+}
/*
* debug_event_common:
@@ -945,7 +955,11 @@ debug_event_common(debug_info_t * id, int level, const void *buf, int len)
if (!debug_active || !id->areas)
return NULL;
- spin_lock_irqsave(&id->lock, flags);
+ if (debug_critical) {
+ if (!spin_trylock_irqsave(&id->lock, flags))
+ return NULL;
+ } else
+ spin_lock_irqsave(&id->lock, flags);
active = get_active_entry(id);
memset(DEBUG_DATA(active), 0, id->buf_size);
memcpy(DEBUG_DATA(active), buf, min(len, id->buf_size));
@@ -954,6 +968,7 @@ debug_event_common(debug_info_t * id, int level, const void *buf, int len)
return active;
}
+EXPORT_SYMBOL(debug_event_common);
/*
* debug_exception_common:
@@ -968,7 +983,11 @@ debug_entry_t
if (!debug_active || !id->areas)
return NULL;
- spin_lock_irqsave(&id->lock, flags);
+ if (debug_critical) {
+ if (!spin_trylock_irqsave(&id->lock, flags))
+ return NULL;
+ } else
+ spin_lock_irqsave(&id->lock, flags);
active = get_active_entry(id);
memset(DEBUG_DATA(active), 0, id->buf_size);
memcpy(DEBUG_DATA(active), buf, min(len, id->buf_size));
@@ -977,6 +996,7 @@ debug_entry_t
return active;
}
+EXPORT_SYMBOL(debug_exception_common);
/*
* counts arguments in format string for sprintf view
@@ -1013,7 +1033,11 @@ debug_sprintf_event(debug_info_t* id, int level,char *string,...)
return NULL;
numargs=debug_count_numargs(string);
- spin_lock_irqsave(&id->lock, flags);
+ 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);
@@ -1026,6 +1050,7 @@ debug_sprintf_event(debug_info_t* id, int level,char *string,...)
return active;
}
+EXPORT_SYMBOL(debug_sprintf_event);
/*
* debug_sprintf_exception:
@@ -1047,7 +1072,11 @@ debug_sprintf_exception(debug_info_t* id, int level,char *string,...)
numargs=debug_count_numargs(string);
- spin_lock_irqsave(&id->lock, flags);
+ 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);
@@ -1060,25 +1089,7 @@ debug_sprintf_exception(debug_info_t* id, int level,char *string,...)
return active;
}
-
-/*
- * debug_init:
- * - is called exactly once to initialize the debug feature
- */
-
-static int
-__init debug_init(void)
-{
- int rc = 0;
-
- 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 rc;
-}
+EXPORT_SYMBOL(debug_sprintf_exception);
/*
* debug_register_view:
@@ -1090,7 +1101,7 @@ debug_register_view(debug_info_t * id, struct debug_view *view)
int rc = 0;
int i;
unsigned long flags;
- mode_t mode;
+ umode_t mode;
struct dentry *pde;
if (!id)
@@ -1116,16 +1127,18 @@ debug_register_view(debug_info_t * id, struct debug_view *view)
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);
- debugfs_remove(pde);
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:
@@ -1134,9 +1147,9 @@ out:
int
debug_unregister_view(debug_info_t * id, struct debug_view *view)
{
- int rc = 0;
- int i;
+ struct dentry *dentry = NULL;
unsigned long flags;
+ int i, rc = 0;
if (!id)
goto out;
@@ -1148,13 +1161,16 @@ debug_unregister_view(debug_info_t * id, struct debug_view *view)
if (i == DEBUG_MAX_VIEWS)
rc = -1;
else {
- debugfs_remove(id->debugfs_entries[i]);
+ 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)
@@ -1428,10 +1444,10 @@ debug_hex_ascii_format_fn(debug_info_t * id, struct debug_view *view,
rc += sprintf(out_buf + rc, "| ");
for (i = 0; i < id->buf_size; i++) {
unsigned char c = in_buf[i];
- if (!isprint(c))
- rc += sprintf(out_buf + rc, ".");
- else
+ 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;
@@ -1464,6 +1480,7 @@ debug_dflt_header_fn(debug_info_t * id, struct debug_view *view,
except_str, entry->id.fields.cpuid, (void *) caller);
return rc;
}
+EXPORT_SYMBOL(debug_dflt_header_fn);
/*
* prints debug data sprintf-formated:
@@ -1512,33 +1529,16 @@ out:
}
/*
- * clean up module
+ * debug_init:
+ * - is called exactly once to initialize the debug feature
*/
-static void __exit debug_exit(void)
+static int __init debug_init(void)
{
- debugfs_remove(debug_debugfs_root_entry);
- unregister_sysctl_table(s390dbf_sysctl_header);
- return;
+ 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;
}
-
-/*
- * module definitions
- */
postcore_initcall(debug_init);
-module_exit(debug_exit);
-MODULE_LICENSE("GPL");
-
-EXPORT_SYMBOL(debug_register);
-EXPORT_SYMBOL(debug_unregister);
-EXPORT_SYMBOL(debug_set_level);
-EXPORT_SYMBOL(debug_stop_all);
-EXPORT_SYMBOL(debug_register_view);
-EXPORT_SYMBOL(debug_unregister_view);
-EXPORT_SYMBOL(debug_event_common);
-EXPORT_SYMBOL(debug_exception_common);
-EXPORT_SYMBOL(debug_hex_ascii_view);
-EXPORT_SYMBOL(debug_raw_view);
-EXPORT_SYMBOL(debug_dflt_header_fn);
-EXPORT_SYMBOL(debug_sprintf_view);
-EXPORT_SYMBOL(debug_sprintf_exception);
-EXPORT_SYMBOL(debug_sprintf_event);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-09 21:54:19 +0000