debug.c
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:31k
- /*
- * arch/s390/kernel/debug.c
- * S/390 debug facility
- *
- * Copyright (C) 1999, 2000 IBM Deutschland Entwicklung GmbH,
- * IBM Corporation
- * Author(s): Michael Holzheu (holzheu@de.ibm.com),
- * Holger Smolinski (Holger.Smolinski@de.ibm.com)
- *
- * Bugreports to: <Linux390@de.ibm.com>
- */
- #include <linux/config.h>
- #include <linux/stddef.h>
- #include <linux/kernel.h>
- #include <linux/errno.h>
- #include <linux/slab.h>
- #include <linux/ctype.h>
- #include <linux/version.h>
- #include <asm/uaccess.h>
- #include <asm/semaphore.h>
- #include <linux/module.h>
- #include <asm/debug.h>
- #define MIN(a,b) (((a)<(b))?(a):(b))
- #define DEBUG_PROLOG_ENTRY -1
- /* 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_entry; /* last formated entry (offset */
- /* relative to beginning of last */
- /* formated area) */
- 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;
- extern void tod_to_timeval(uint64_t todval, struct timeval *xtime);
- /* internal function prototyes */
- static int debug_init(void);
- static ssize_t debug_output(struct file *file, char *user_buf,
- size_t user_len, loff_t * offset);
- static ssize_t debug_input(struct file *file, const char *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 struct proc_dir_entry
- *debug_create_proc_dir_entry(struct proc_dir_entry *root,
- const char *name, mode_t mode,
- struct inode_operations *iops,
- struct file_operations *fops);
- static void debug_delete_proc_dir_entry(struct proc_dir_entry *root,
- struct proc_dir_entry *entry);
- static debug_info_t* debug_info_create(char *name, int page_order, int nr_areas, int buf_size);
- 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_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_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_raw_format_fn(debug_info_t * id,
- struct debug_view *view, char *out_buf,
- const char *in_buf);
- static int debug_raw_header_fn(debug_info_t * id, struct debug_view *view,
- int area, debug_entry_t * entry, char *out_buf);
- static int debug_sprintf_format_fn(debug_info_t * id, struct debug_view *view,
- char *out_buf, debug_sprintf_entry *curr_event);
- /* globals */
- struct debug_view debug_raw_view = {
- "raw",
- NULL,
- &debug_raw_header_fn,
- &debug_raw_format_fn,
- NULL,
- NULL
- };
- struct debug_view debug_hex_ascii_view = {
- "hex_ascii",
- NULL,
- &debug_dflt_header_fn,
- &debug_hex_ascii_format_fn,
- NULL,
- NULL
- };
- struct debug_view debug_level_view = {
- "level",
- &debug_prolog_level_fn,
- NULL,
- NULL,
- &debug_input_level_fn,
- NULL
- };
- 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
- };
- unsigned int debug_feature_version = __DEBUG_FEATURE_VERSION;
- /* static globals */
- static debug_info_t *debug_area_first = NULL;
- static debug_info_t *debug_area_last = NULL;
- #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,3,98))
- static struct semaphore debug_lock = MUTEX;
- #else
- DECLARE_MUTEX(debug_lock);
- #endif
- static int initialized = 0;
- static struct file_operations debug_file_ops = {
- read: debug_output,
- write: debug_input,
- open: debug_open,
- release: debug_close,
- };
- static struct inode_operations debug_inode_ops = {
- #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,3,98))
- default_file_ops: &debug_file_ops, /* file ops */
- #endif
- };
- static struct proc_dir_entry *debug_proc_root_entry;
- /* functions */
- /*
- * debug_info_alloc
- * - alloc new debug-info
- */
- static debug_info_t* debug_info_alloc(char *name, int page_order,
- int nr_areas, int buf_size)
- {
- debug_info_t* rc;
- int i;
- /* alloc everything */
- rc = (debug_info_t*) kmalloc(sizeof(debug_info_t), GFP_ATOMIC);
- if(!rc)
- goto fail_malloc_rc;
- rc->active_entry = (int*)kmalloc(nr_areas * sizeof(int), GFP_ATOMIC);
- if(!rc->active_entry)
- goto fail_malloc_active_entry;
- memset(rc->active_entry, 0, nr_areas * sizeof(int));
- rc->areas = (debug_entry_t **) kmalloc(nr_areas *
- sizeof(debug_entry_t *),
- GFP_ATOMIC);
- if (!rc->areas)
- goto fail_malloc_areas;
- for (i = 0; i < nr_areas; i++) {
- rc->areas[i] = (debug_entry_t *) __get_free_pages(GFP_ATOMIC,
- page_order);
- if (!rc->areas[i]) {
- for (i--; i >= 0; i--) {
- free_pages((unsigned long) rc->areas[i],
- page_order);
- }
- goto fail_malloc_areas2;
- } else {
- memset(rc->areas[i], 0, PAGE_SIZE << page_order);
- }
- }
- /* initialize members */
- spin_lock_init(&rc->lock);
- rc->page_order = page_order;
- rc->nr_areas = nr_areas;
- rc->active_area = 0;
- rc->level = DEBUG_DEFAULT_LEVEL;
- rc->buf_size = buf_size;
- rc->entry_size = sizeof(debug_entry_t) + buf_size;
- strncpy(rc->name, name, MIN(strlen(name), (DEBUG_MAX_PROCF_LEN - 1)));
- rc->name[MIN(strlen(name), (DEBUG_MAX_PROCF_LEN - 1))] = 0;
- memset(rc->views, 0, DEBUG_MAX_VIEWS * sizeof(struct debug_view *));
- #ifdef CONFIG_PROC_FS
- memset(rc->proc_entries, 0 ,DEBUG_MAX_VIEWS *
- sizeof(struct proc_dir_entry*));
- #endif /* CONFIG_PROC_FS */
- atomic_set(&(rc->ref_count), 0);
- return rc;
- fail_malloc_areas2:
- kfree(rc->areas);
- fail_malloc_areas:
- kfree(rc->active_entry);
- fail_malloc_active_entry:
- kfree(rc);
- fail_malloc_rc:
- return NULL;
- }
- /*
- * debug_info_free
- * - free memory debug-info
- */
- static void debug_info_free(debug_info_t* db_info){
- int i;
- for (i = 0; i < db_info->nr_areas; i++) {
- free_pages((unsigned long) db_info->areas[i],
- db_info->page_order);
- }
- kfree(db_info->areas);
- kfree(db_info->active_entry);
- kfree(db_info);
- }
- /*
- * debug_info_create
- * - create new debug-info
- */
- static debug_info_t* debug_info_create(char *name, int page_order,
- int nr_areas, int buf_size)
- {
- debug_info_t* rc;
- rc = debug_info_alloc(name, page_order, nr_areas, buf_size);
- if(!rc)
- goto out;
- /* create proc rood directory */
- rc->proc_root_entry =
- debug_create_proc_dir_entry(debug_proc_root_entry, rc->name,
- S_IFDIR | S_IRUGO | S_IXUGO |
- S_IWUSR | S_IWGRP, NULL, NULL);
- /* append new element to linked list */
- if(debug_area_first == NULL){
- /* 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;
- debug_info_get(rc);
- out:
- return rc;
- }
- /*
- * debug_info_copy
- * - copy debug-info
- */
- static debug_info_t* debug_info_copy(debug_info_t* in)
- {
- int i;
- debug_info_t* rc;
- rc = debug_info_alloc(in->name, in->page_order,
- in->nr_areas, in->buf_size);
- if(!rc)
- goto out;
- for(i = 0; i < in->nr_areas; i++){
- memcpy(rc->areas[i],in->areas[i], PAGE_SIZE << in->page_order);
- }
- out:
- return rc;
- }
- /*
- * debug_info_get
- * - increments reference count for debug-info
- */
- static void debug_info_get(debug_info_t * db_info)
- {
- if (db_info)
- atomic_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 (atomic_dec_and_test(&db_info->ref_count)) {
- #ifdef DEBUG
- printk(KERN_INFO "debug: freeing debug area %p (%s)n",
- db_info, db_info->name);
- #endif
- for (i = 0; i < DEBUG_MAX_VIEWS; i++) {
- if (db_info->views[i] != NULL)
- debug_delete_proc_dir_entry
- (db_info->proc_root_entry,
- db_info->proc_entries[i]);
- }
- debug_delete_proc_dir_entry(debug_proc_root_entry,
- db_info->proc_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_org = p_info->debug_info_org;
- 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_org, view,p_info->temp_buf);
- goto out;
- }
- act_entry = (debug_entry_t *) ((char*)id_snap->areas[p_info->act_area] +
- p_info->act_entry);
-
- if (act_entry->id.stck == 0LL)
- goto out; /* empty entry */
- if (view->header_proc)
- len += view->header_proc(id_org, view, p_info->act_area,
- act_entry, p_info->temp_buf + len);
- if (view->format_proc)
- len += view->format_proc(id_org, view, p_info->temp_buf + len,
- DEBUG_DATA(act_entry));
- out:
- return len;
- }
- /*
- * debug_next_entry:
- * - goto next entry in p_info
- */
- extern inline int debug_next_entry(file_private_info_t *p_info)
- {
- debug_info_t *id = p_info->debug_info_snap;
- if(p_info->act_entry == DEBUG_PROLOG_ENTRY){
- p_info->act_entry = 0;
- goto out;
- }
- if ((p_info->act_entry += id->entry_size)
- > ((PAGE_SIZE << (id->page_order))
- - id->entry_size)){
- /* next area */
- p_info->act_entry = 0;
- p_info->act_area++;
- 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_buf, /* user buffer */
- size_t len, /* length of buffer */
- loff_t *offset /* offset in the file */ )
- {
- size_t count = 0;
- size_t entry_offset, size = 0;
- int rc;
- 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){
- size = debug_format_entry(p_info);
- size = MIN((len - count), (size - entry_offset));
- if(size){
- if ((rc = copy_to_user(user_buf + count,
- p_info->temp_buf + entry_offset, size)))
- return rc;
- }
- count += size;
- entry_offset = 0;
- if(count != len)
- if(debug_next_entry(p_info))
- goto out;
- }
- out:
- p_info->offset = *offset + count;
- p_info->act_entry_offset = size;
- *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_buf, size_t length,
- loff_t *offset)
- {
- int rc = 0;
- file_private_info_t *p_info;
- down(&debug_lock);
- 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;
- up(&debug_lock);
- 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)
- {
- int i = 0, rc = 0;
- file_private_info_t *p_info;
- debug_info_t *debug_info, *debug_info_snapshot;
- #ifdef DEBUG
- printk("debug_openn");
- #endif
- MOD_INC_USE_COUNT;
- down(&debug_lock);
- /* find debug log and view */
- debug_info = debug_area_first;
- while(debug_info != NULL){
- for (i = 0; i < DEBUG_MAX_VIEWS; i++) {
- if (debug_info->views[i] == NULL)
- continue;
- else if (debug_info->proc_entries[i]->low_ino ==
- file->f_dentry->d_inode->i_ino) {
- goto found; /* found view ! */
- }
- }
- debug_info = debug_info->next;
- }
- /* no entry found */
- rc = -EINVAL;
- goto out;
- found:
- /* make snapshot of current debug areas to get it consistent */
- debug_info_snapshot = debug_info_copy(debug_info);
- if(!debug_info_snapshot){
- #ifdef DEBUG
- printk(KERN_ERR "debug_open: debug_info_copy failed (out of mem)n");
- #endif
- rc = -ENOMEM;
- goto out;
- }
- if ((file->private_data =
- kmalloc(sizeof(file_private_info_t), GFP_ATOMIC)) == 0) {
- #ifdef DEBUG
- printk(KERN_ERR "debug_open: kmalloc failedn");
- #endif
- debug_info_free(debug_info_snapshot);
- rc = -ENOMEM;
- goto out;
- }
- p_info = (file_private_info_t *) file->private_data;
- 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_entry = DEBUG_PROLOG_ENTRY;
- p_info->act_entry_offset = 0;
- debug_info_get(debug_info);
- out:
- up(&debug_lock);
- if (rc != 0)
- MOD_DEC_USE_COUNT;
- 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;
- #ifdef DEBUG
- printk("debug_closen");
- #endif
- p_info = (file_private_info_t *) file->private_data;
- debug_info_free(p_info->debug_info_snap);
- debug_info_put(p_info->debug_info_org);
- kfree(file->private_data);
- MOD_DEC_USE_COUNT;
- return 0; /* success */
- }
- /*
- * debug_create_proc_dir_entry:
- * - initializes proc-dir-entry and registers it
- */
- static struct proc_dir_entry *debug_create_proc_dir_entry
- (struct proc_dir_entry *root, const char *name, mode_t mode,
- struct inode_operations *iops, struct file_operations *fops)
- {
- struct proc_dir_entry *rc = NULL;
- #ifdef CONFIG_PROC_FS
- #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,3,98))
- const char *fn = name;
- int len;
- len = strlen(fn);
- rc = (struct proc_dir_entry *) kmalloc(sizeof(struct proc_dir_entry)
- + len + 1, GFP_ATOMIC);
- if (!rc)
- goto out;
- memset(rc, 0, sizeof(struct proc_dir_entry));
- memcpy(((char *) rc) + sizeof(*rc), fn, len + 1);
- rc->name = ((char *) rc) + sizeof(*rc);
- rc->namelen = len;
- rc->low_ino = 0, rc->mode = mode;
- rc->nlink = 1;
- rc->uid = 0;
- rc->gid = 0;
- rc->size = 0;
- rc->get_info = NULL;
- rc->ops = iops;
- proc_register(root, rc);
- #else
- rc = create_proc_entry(name, mode, root);
- if (!rc)
- goto out;
- if (fops)
- rc->proc_fops = fops;
- #endif
- out:
- #endif /* CONFIG_PROC_FS */
- return rc;
- }
- /*
- * delete_proc_dir_entry:
- */
- static void debug_delete_proc_dir_entry
- (struct proc_dir_entry *root, struct proc_dir_entry *proc_entry)
- {
- #ifdef CONFIG_PROC_FS
- #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,3,98))
- proc_unregister(root, proc_entry->low_ino);
- kfree(proc_entry);
- #else
- remove_proc_entry(proc_entry->name, root);
- #endif
- #endif /* CONFIG_PROC_FS */
- }
- /*
- * debug_register:
- * - creates and initializes debug area for the caller
- * - returns handle for debug area
- */
- debug_info_t *debug_register
- (char *name, int page_order, int nr_areas, int buf_size)
- {
- debug_info_t *rc = NULL;
- MOD_INC_USE_COUNT;
- if (!initialized)
- debug_init();
- down(&debug_lock);
- /* create new debug_info */
- rc = debug_info_create(name, page_order, nr_areas, buf_size);
- if(!rc)
- goto out;
- debug_register_view(rc, &debug_level_view);
- debug_register_view(rc, &debug_flush_view);
- #ifdef DEBUG
- printk(KERN_INFO
- "debug: reserved %d areas of %d pages for debugging %sn",
- nr_areas, 1 << page_order, rc->name);
- #endif
- out:
- if (rc == NULL){
- printk(KERN_ERR "debug: debug_register failed for %sn",name);
- MOD_DEC_USE_COUNT;
- }
- up(&debug_lock);
- return rc;
- }
- /*
- * debug_unregister:
- * - give back debug area
- */
- void debug_unregister(debug_info_t * id)
- {
- if (!id)
- goto out;
- down(&debug_lock);
- #ifdef DEBUG
- printk(KERN_INFO "debug: unregistering %sn", id->name);
- #endif
- debug_info_put(id);
- up(&debug_lock);
- MOD_DEC_USE_COUNT;
- out:
- return;
- }
- /*
- * debug_set_level:
- * - set actual debug level
- */
- 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;
- printk(KERN_INFO "debug: %s: switched offn",id->name);
- } else if ((new_level > DEBUG_MAX_LEVEL) || (new_level < 0)) {
- printk(KERN_INFO
- "debug: %s: level %i is out of range (%i - %i)n",
- id->name, new_level, 0, DEBUG_MAX_LEVEL);
- } else {
- id->level = new_level;
- printk(KERN_INFO
- "debug: %s: new level %in",id->name,id->level);
- }
- spin_unlock_irqrestore(&id->lock,flags);
- }
- /*
- * proceed_active_entry:
- * - set active entry to next in the ring buffer
- */
- extern inline void proceed_active_entry(debug_info_t * id)
- {
- if ((id->active_entry[id->active_area] += id->entry_size)
- > ((PAGE_SIZE << (id->page_order)) - id->entry_size))
- id->active_entry[id->active_area] = 0;
- }
- /*
- * proceed_active_area:
- * - set active area to next in the ring buffer
- */
- extern inline void proceed_active_area(debug_info_t * id)
- {
- id->active_area++;
- id->active_area = id->active_area % id->nr_areas;
- }
- /*
- * get_active_entry:
- */
- extern inline debug_entry_t *get_active_entry(debug_info_t * id)
- {
- return (debug_entry_t *) ((char *) id->areas[id->active_area] +
- id->active_entry[id->active_area]);
- }
- /*
- * debug_common:
- * - set timestamp, caller address, cpu number etc.
- */
- extern inline debug_entry_t *debug_common(debug_info_t * id, int level,
- const void *buf, int len, int exception)
- {
- unsigned long flags;
- debug_entry_t *active;
- spin_lock_irqsave(&id->lock, flags);
- active = get_active_entry(id);
- STCK(active->id.stck);
- active->id.fields.cpuid = smp_processor_id();
- active->caller = __builtin_return_address(0);
- active->id.fields.exception = exception;
- active->id.fields.level = level;
- memset(DEBUG_DATA(active), 0, id->buf_size);
- memcpy(DEBUG_DATA(active), buf, MIN(len, id->buf_size));
- proceed_active_entry(id);
- if(exception)
- proceed_active_area(id);
- spin_unlock_irqrestore(&id->lock, flags);
- return active;
- }
- /*
- * 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)
- {
- return debug_common(id, level, buf, len, 0);
- }
- /*
- * 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)
- {
- return debug_common(id, level, buf, len, 1);
- }
- /*
- * counts arguments in format string for sprintf view
- */
- extern 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,...)
- {
- va_list ap;
- int numargs,alloc_size,idx;
- debug_sprintf_entry *curr_event;
- debug_entry_t *retval = NULL;
- if((!id) || (level > id->level))
- return NULL;
- else {
- numargs=debug_count_numargs(string);
- alloc_size=offsetof(debug_sprintf_entry,args[numargs]);
- curr_event=alloca(alloc_size);
- if(curr_event){
- va_start(ap,string);
- curr_event->string=string;
- for(idx=0;idx<numargs;idx++)
- curr_event->args[idx]=va_arg(ap,long);
- retval=debug_common(id,level, curr_event,alloc_size,0);
- va_end(ap);
- }
- return retval;
- }
- }
- /*
- * debug_sprintf_exception:
- */
- debug_entry_t *debug_sprintf_exception(debug_info_t* id,
- int level,char *string,...)
- {
- va_list ap;
- int numargs,alloc_size,idx;
- debug_sprintf_entry *curr_event;
- debug_entry_t *retval = NULL;
- if((!id) || (level > id->level))
- return NULL;
- else {
- numargs=debug_count_numargs(string);
- alloc_size=offsetof(debug_sprintf_entry,args[numargs]);
- curr_event=alloca(alloc_size);
- if(curr_event){
- va_start(ap,string);
- curr_event->string=string;
- for(idx=0;idx<numargs;idx++)
- curr_event->args[idx]=va_arg(ap,long);
- retval=debug_common(id,level, curr_event,alloc_size,1);
- va_end(ap);
- }
- return retval;
- }
- }
- /*
- * debug_init:
- * - is called exactly once to initialize the debug feature
- */
- int debug_init(void)
- {
- int rc = 0;
- down(&debug_lock);
- if (!initialized) {
- #ifdef CONFIG_PROC_FS
- debug_proc_root_entry =
- debug_create_proc_dir_entry(&proc_root, DEBUG_DIR_ROOT,
- S_IFDIR | S_IRUGO | S_IXUGO
- | S_IWUSR | S_IWGRP, NULL,
- NULL);
- #endif /* CONFIG_PROC_FS */
- printk(KERN_INFO "debug: Initialization completen");
- initialized = 1;
- }
- up(&debug_lock);
- return rc;
- }
- /*
- * debug_register_view:
- */
- int debug_register_view(debug_info_t * id, struct debug_view *view)
- {
- int rc = 0;
- int i;
- unsigned long flags;
- mode_t mode = S_IFREG;
- if (!id)
- goto out;
- spin_lock_irqsave(&id->lock, flags);
- for (i = 0; i < DEBUG_MAX_VIEWS; i++) {
- if (id->views[i] == NULL)
- break;
- }
- if (i == DEBUG_MAX_VIEWS) {
- printk(KERN_WARNING "debug: cannot register view %s/%sn",
- id->name,view->name);
- printk(KERN_WARNING
- "debug: maximum number of views reached (%i)!n", i);
- rc = -1;
- }
- else {
- id->views[i] = view;
- if (view->prolog_proc || view->format_proc || view->header_proc)
- mode |= S_IRUSR;
- if (view->input_proc)
- mode |= S_IWUSR;
- id->proc_entries[i] =
- debug_create_proc_dir_entry(id->proc_root_entry,
- view->name, mode,
- &debug_inode_ops,
- &debug_file_ops);
- rc = 0;
- }
- spin_unlock_irqrestore(&id->lock, flags);
- out:
- return rc;
- }
- /*
- * debug_unregister_view:
- */
- int debug_unregister_view(debug_info_t * id, struct debug_view *view)
- {
- int rc = 0;
- int i;
- unsigned long flags;
- 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 {
- debug_delete_proc_dir_entry(id->proc_root_entry,
- id->proc_entries[i]);
- id->views[i] = NULL;
- rc = 0;
- }
- spin_unlock_irqrestore(&id->lock, flags);
- out:
- return rc;
- }
- /*
- * functions for debug-views
- ***********************************
- */
- /*
- * 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 == -1) rc = sprintf(out_buf,"-n");
- else rc = sprintf(out_buf, "%in", 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_buf,
- size_t in_buf_size, loff_t * offset)
- {
- char input_buf[1];
- int rc = in_buf_size;
- if (*offset != 0)
- goto out;
- if (copy_from_user(input_buf, user_buf, 1)){
- rc = -EFAULT;
- goto out;
- }
- if (isdigit(input_buf[0])) {
- int new_level = ((int) input_buf[0] - (int) '0');
- debug_set_level(id, new_level);
- } else if(input_buf[0] == '-') {
- debug_set_level(id, DEBUG_OFF_LEVEL);
- } else {
- printk(KERN_INFO "debug: level `%c` is not validn",
- input_buf[0]);
- }
- out:
- *offset += in_buf_size;
- return rc; /* number of input characters */
- }
- /*
- * flushes debug areas
- */
-
- void debug_flush(debug_info_t* id, int area)
- {
- unsigned long flags;
- int i;
- if(!id)
- return;
- spin_lock_irqsave(&id->lock,flags);
- if(area == DEBUG_FLUSH_ALL){
- id->active_area = 0;
- memset(id->active_entry, 0, id->nr_areas * sizeof(int));
- for (i = 0; i < id->nr_areas; i++)
- memset(id->areas[i], 0, PAGE_SIZE << id->page_order);
- printk(KERN_INFO "debug: %s: all areas flushedn",id->name);
- } else if(area >= 0 && area < id->nr_areas) {
- id->active_entry[area] = 0;
- memset(id->areas[area], 0, PAGE_SIZE << id->page_order);
- printk(KERN_INFO
- "debug: %s: area %i has been flushedn",
- id->name, area);
- } else {
- printk(KERN_INFO
- "debug: %s: area %i cannot be flushed (range: %i - %i)n",
- id->name, area, 0, id->nr_areas-1);
- }
- 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_buf,
- size_t in_buf_size, loff_t * offset)
- {
- char input_buf[1];
- int rc = in_buf_size;
-
- if (*offset != 0)
- 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;
- }
- printk(KERN_INFO "debug: area `%c` is not validn", input_buf[0]);
- out:
- *offset += in_buf_size;
- return rc; /* number of input characters */
- }
- /*
- * prints debug header in raw format
- */
- int debug_raw_header_fn(debug_info_t * id, struct debug_view *view,
- int area, debug_entry_t * entry, char *out_buf)
- {
- int rc;
- rc = sizeof(debug_entry_t);
- memcpy(out_buf,entry,sizeof(debug_entry_t));
- return rc;
- }
- /*
- * prints debug data in raw format
- */
- static int debug_raw_format_fn(debug_info_t * id, struct debug_view *view,
- char *out_buf, const char *in_buf)
- {
- int rc;
- rc = id->buf_size;
- memcpy(out_buf, in_buf, id->buf_size);
- return rc;
- }
- /*
- * 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 (!isprint(c))
- rc += sprintf(out_buf + rc, ".");
- else
- rc += sprintf(out_buf + rc, "%c", c);
- }
- 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)
- {
- struct timeval time_val;
- unsigned long long time;
- char *except_str;
- unsigned long caller;
- int rc = 0;
- unsigned int level;
- level = entry->id.fields.level;
- time = entry->id.stck;
- /* adjust todclock to 1970 */
- time -= 0x8126d60e46000000LL - (0x3c26700LL * 1000000 * 4096);
- tod_to_timeval(time, &time_val);
- if (entry->id.fields.exception)
- except_str = "*";
- else
- except_str = "-";
- caller = (unsigned long) entry->caller;
- #if defined(CONFIG_ARCH_S390X)
- rc += sprintf(out_buf, "%02i %011lu:%06lu %1u %1s %02i %016lx ",
- area, time_val.tv_sec, time_val.tv_usec, level,
- except_str, entry->id.fields.cpuid, caller);
- #else
- caller &= 0x7fffffff;
- rc += sprintf(out_buf, "%02i %011lu:%06lu %1u %1s %02i %08lx ",
- area, time_val.tv_sec, time_val.tv_usec, level,
- except_str, entry->id.fields.cpuid, caller);
- #endif
- return rc;
- }
- /*
- * prints debug data sprintf-formated:
- * debug_sprinf_event/exception calls must be used together with this view
- */
- #define DEBUG_SPRINTF_MAX_ARGS 10
- int debug_sprintf_format_fn(debug_info_t * id, struct debug_view *view,
- char *out_buf, debug_sprintf_entry *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;
- }
- /*
- * init_module:
- */
- #ifdef MODULE
- int init_module(void)
- {
- int rc = 0;
- #ifdef DEBUG
- printk("debug_module_init: n");
- #endif
- rc = debug_init();
- if (rc)
- printk(KERN_INFO "debug: an error occurred with debug_initn");
- return rc;
- }
- /*
- * cleanup_module:
- */
- void cleanup_module(void)
- {
- #ifdef DEBUG
- printk("debug_cleanup_module: n");
- #endif
- #ifdef CONFIG_PROC_FS
- debug_delete_proc_dir_entry(&proc_root, debug_proc_root_entry);
- #endif /* CONFIG_PROC_FS */
- return;
- }
- #endif /* MODULE */
- EXPORT_SYMBOL(debug_register);
- EXPORT_SYMBOL(debug_unregister);
- EXPORT_SYMBOL(debug_set_level);
- 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);