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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [arch/] [s390/] [kernel/] [debug.c] - Rev 1765
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/* * 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 (copy_to_user(user_buf + count, p_info->temp_buf + entry_offset, size)) return -EFAULT; } 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_open\n"); #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 failed\n"); #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_close\n"); #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 %s\n", nr_areas, 1 << page_order, rc->name); #endif out: if (rc == NULL){ printk(KERN_ERR "debug: debug_register failed for %s\n",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 %s\n", 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 off\n",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; #ifdef DEBUG printk(KERN_INFO "debug: %s: new level %i\n",id->name,id->level); #endif } 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 complete\n"); 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; struct proc_dir_entry *pde; if (!id) goto out; pde = debug_create_proc_dir_entry(id->proc_root_entry, view->name, mode, &debug_inode_ops, &debug_file_ops); if(!pde){ printk(KERN_WARNING "debug: create_proc_entry() failed! Cannot register view %s/%s\n", id->name,view->name); rc = -1; 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/%s\n", id->name,view->name); printk(KERN_WARNING "debug: maximum number of views reached (%i)!\n", i); debug_delete_proc_dir_entry(id->proc_root_entry, pde); 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] = pde; 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, "%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_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 valid\n", 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 flushed\n",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 flushed\n", 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 valid\n", 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_init\n"); 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);