patch-2.4.2 linux/arch/s390x/kernel/debug.c
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- Lines: 1168
- Date:
Tue Feb 13 14:13:44 2001
- Orig file:
v2.4.1/linux/arch/s390x/kernel/debug.c
- Orig date:
Wed Dec 31 16:00:00 1969
diff -u --recursive --new-file v2.4.1/linux/arch/s390x/kernel/debug.c linux/arch/s390x/kernel/debug.c
@@ -0,0 +1,1167 @@
+/*
+ * 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/malloc.h>
+#include <linux/vmalloc.h>
+#include <linux/ctype.h>
+#include <linux/version.h>
+#include <asm/uaccess.h>
+#include <asm/semaphore.h>
+
+#ifdef MODULE
+#include <linux/module.h>
+#endif
+
+#include <asm/debug.h>
+
+#define MIN(a,b) (((a)<(b))?(a):(b))
+
+#if defined(CONFIG_ARCH_S390X)
+#define DEBUG_PROC_HEADER_SIZE 46
+#else
+#define DEBUG_PROC_HEADER_SIZE 38
+#endif
+
+#define ADD_BUFFER 1000
+
+/* typedefs */
+
+typedef struct file_private_info {
+ loff_t len; /* length of output in byte */
+ int size; /* size of buffer for output */
+ char *data; /* buffer for output */
+ debug_info_t *debug_info; /* the debug information struct */
+ struct debug_view *view; /* used view of debug info */
+} file_private_info_t;
+
+extern void tod_to_timeval(uint64_t todval, struct timeval *xtime);
+
+/* internal function prototyes */
+
+static int debug_init(void);
+static int debug_format_output(debug_info_t * debug_area, char *buf,
+ int size, struct debug_view *view);
+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_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);
+
+/* globals */
+
+struct debug_view debug_raw_view = {
+ "raw",
+ NULL,
+ &debug_raw_header_fn,
+ &debug_raw_format_fn,
+ NULL
+};
+
+struct debug_view debug_hex_ascii_view = {
+ "hex_ascii",
+ NULL,
+ &debug_dflt_header_fn,
+ &debug_hex_ascii_format_fn,
+ NULL
+};
+
+struct debug_view debug_level_view = {
+ "level",
+ &debug_prolog_level_fn,
+ NULL,
+ NULL,
+ &debug_input_level_fn
+};
+
+/* 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_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;
+ 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 *));
+ memset(rc->proc_entries, 0 ,DEBUG_MAX_VIEWS *
+ sizeof(struct proc_dir_entry*));
+ atomic_set(&(rc->ref_count), 0);
+ 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);
+ 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_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)) {
+ printk(KERN_INFO "debug: freeing debug area %p (%s)\n",
+ db_info, db_info->name);
+ 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);
+ 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);
+ 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;
+ kfree(db_info);
+ }
+}
+
+
+/*
+ * debug_output:
+ * - called for user read()
+ * - copies formated output form private_data of the file
+ * handle to the user buffer
+ */
+
+static ssize_t debug_output(struct file *file, /* file descriptor */
+ char *user_buf, /* user buffer */
+ size_t user_len, /* length of buffer */
+ loff_t *offset /* offset in the file */ )
+{
+ loff_t len;
+ int rc;
+ file_private_info_t *p_info;
+
+ p_info = ((file_private_info_t *) file->private_data);
+ if (*offset >= p_info->len) {
+ return 0; /* EOF */
+ } else {
+ len = MIN(user_len, (p_info->len - *offset));
+ if ((rc = copy_to_user(user_buf, &(p_info->data[*offset]),len)))
+ return rc;;
+ (*offset) += len;
+ return len; /* number of bytes "read" */
+ }
+}
+
+/*
+ * 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,
+ p_info->view, file, user_buf,
+ length, offset);
+ up(&debug_lock);
+ return rc; /* number of input characters */
+}
+
+/*
+ * debug_format_output:
+ * - calls prolog, header and format functions of view to format output
+ */
+
+static int debug_format_output(debug_info_t * debug_area, char *buf,
+ int size, struct debug_view *view)
+{
+ int len = 0;
+ int i, j;
+ int nr_of_entries;
+ debug_entry_t *act_entry;
+
+ /* print prolog */
+ if (view->prolog_proc)
+ len += view->prolog_proc(debug_area, view, buf);
+ /* print debug records */
+ if (!(view->format_proc) && !(view->header_proc))
+ goto out;
+ nr_of_entries = PAGE_SIZE / debug_area->entry_size
+ << debug_area->page_order;
+ for (i = 0; i < debug_area->nr_areas; i++) {
+ act_entry = debug_area->areas[i];
+ for (j = 0; j < nr_of_entries; j++) {
+ if (act_entry->id.fields.used == 0)
+ break; /* empty entry */
+ if (view->header_proc)
+ len += view->header_proc(debug_area, view, i,
+ act_entry, buf + len);
+ if (view->format_proc)
+ len += view->format_proc(debug_area, view,
+ buf + len,
+ DEBUG_DATA(act_entry));
+ if (len > size) {
+ printk(KERN_ERR
+ "debug: error -- memory exceeded for (%s/%s)\n",
+ debug_area->name, view->name);
+ printk(KERN_ERR "debug: fix view %s!!\n",
+ view->name);
+ printk(KERN_ERR
+ "debug: area: %i (0 - %i) entry: %i (0 - %i)\n",
+ i, debug_area->nr_areas - 1, j,
+ nr_of_entries - 1);
+ goto out;
+ }
+ act_entry = (debug_entry_t *) (((char *) act_entry) +
+ debug_area->entry_size);
+ }
+ }
+ out:
+ return len;
+}
+
+
+/*
+ * 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, size = 0, rc = 0, f_entry_size = 0;
+ file_private_info_t *p_info;
+ debug_info_t* debug_info;
+
+#ifdef DEBUG
+ printk("debug_open\n");
+#endif
+
+#ifdef MODULE
+ MOD_INC_USE_COUNT;
+#endif
+ 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:
+ if ((file->private_data =
+ kmalloc(sizeof(file_private_info_t), GFP_ATOMIC)) == 0) {
+ printk(KERN_ERR "debug_open: kmalloc failed\n");
+ rc = -ENOMEM;
+ goto out;
+ }
+ p_info = (file_private_info_t *) file->private_data;
+
+ /*
+ * the size for the formated output is calculated
+ * with the following formula:
+ *
+ * prolog-size
+ * +
+ * (record header size + record data field size)
+ * * number of entries per page
+ * * number of pages per area
+ * * number of areas
+ */
+
+ if (debug_info->views[i]->prolog_proc)
+ size +=
+ debug_info->views[i]->prolog_proc(debug_info,
+ debug_info->
+ views[i], NULL);
+
+ if (debug_info->views[i]->header_proc)
+ f_entry_size =
+ debug_info->views[i]->header_proc(debug_info,
+ debug_info->
+ views[i], 0, NULL,
+ NULL);
+ if (debug_info->views[i]->format_proc)
+ f_entry_size +=
+ debug_info->views[i]->format_proc(debug_info,
+ debug_info->
+ views[i], NULL,
+ NULL);
+
+ size += f_entry_size
+ * (PAGE_SIZE / debug_info->entry_size
+ << debug_info->page_order)
+ * debug_info->nr_areas + 1; /* terminating \0 */
+#ifdef DEBUG
+ printk("debug_open: size: %i\n", size);
+#endif
+
+ /* alloc some bytes more to be safe against bad views */
+ if ((p_info->data = vmalloc(size + ADD_BUFFER)) == 0) {
+ printk(KERN_ERR "debug_open: vmalloc failed\n");
+ vfree(file->private_data);
+ rc = -ENOMEM;
+ goto out;
+ }
+
+ p_info->size = size;
+ p_info->debug_info = debug_info;
+ p_info->view = debug_info->views[i];
+
+ spin_lock_irq(&debug_info->lock);
+
+ p_info->len =
+ debug_format_output(debug_info, p_info->data, size,
+ debug_info->views[i]);
+#ifdef DEBUG
+ {
+ int ilen = p_info->len;
+ printk("debug_open: len: %i\n", ilen);
+ }
+#endif
+
+ spin_unlock_irq(&debug_info->lock);
+ debug_info_get(debug_info);
+
+ out:
+ up(&debug_lock);
+#ifdef MODULE
+ if (rc != 0)
+ MOD_DEC_USE_COUNT;
+#endif
+ 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
+ down(&debug_lock);
+ p_info = (file_private_info_t *) file->private_data;
+ debug_info_put(p_info->debug_info);
+ if (p_info->data) {
+ vfree(p_info->data);
+ kfree(file->private_data);
+ }
+ up(&debug_lock);
+
+#ifdef MODULE
+ MOD_DEC_USE_COUNT;
+#endif
+ 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;
+
+#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:
+ return rc;
+}
+
+
+/*
+ * delete_proc_dir_entry:
+ */
+
+static void debug_delete_proc_dir_entry
+ (struct proc_dir_entry *root, struct proc_dir_entry *proc_entry)
+{
+
+#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
+}
+
+/*
+ * 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;
+
+#ifdef MODULE
+ MOD_INC_USE_COUNT;
+#endif
+ 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);
+ printk(KERN_INFO
+ "debug: reserved %d areas of %d pages for debugging %s\n",
+ nr_areas, 1 << page_order, rc->name);
+ out:
+ if (rc == NULL){
+ printk(KERN_ERR "debug: debug_register failed for %s\n",name);
+#ifdef MODULE
+ MOD_DEC_USE_COUNT;
+#endif
+ }
+ 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);
+ printk(KERN_INFO "debug: unregistering %s\n", id->name);
+ debug_info_put(id);
+ up(&debug_lock);
+
+#ifdef MODULE
+ MOD_DEC_USE_COUNT;
+#endif
+ out:
+ return;
+}
+
+/*
+ * debug_set_level:
+ * - set actual debug level
+ */
+
+void debug_set_level(debug_info_t* id, int new_level)
+{
+ 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;
+ printk(KERN_INFO
+ "debug: %s: new level %i\n",id->name,id->level);
+ }
+ spin_unlock_irqrestore(&id->lock,flags);
+}
+
+
+/*
+ * 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_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
+ */
+
+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_entry[id->active_area]);
+}
+
+/*
+ * debug_common:
+ * - set timestamp, caller address, cpu number etc.
+ */
+
+static inline debug_entry_t *debug_common(debug_info_t * id)
+{
+ debug_entry_t *active;
+
+ active = get_active_entry(id);
+ STCK(active->id.stck);
+ active->id.fields.cpuid = smp_processor_id();
+ active->id.fields.used = 1;
+ active->caller = __builtin_return_address(0);
+ return active;
+}
+
+/*
+ * debug_event:
+ */
+
+debug_entry_t *debug_event(debug_info_t * id, int level, void *buf,
+ int len)
+{
+ long flags;
+ debug_entry_t *active = NULL;
+
+ if ((!id) || (level > id->level))
+ goto out;
+ spin_lock_irqsave(&id->lock, flags);
+ active = debug_common(id);
+ active->id.fields.exception = 0;
+ memset(DEBUG_DATA(active), 0, id->buf_size);
+ memcpy(DEBUG_DATA(active), buf, MIN(len, id->buf_size));
+ proceed_active_entry(id);
+ spin_unlock_irqrestore(&id->lock, flags);
+ out:
+ return active;
+}
+
+/*
+ * debug_int_event:
+ */
+
+debug_entry_t *debug_int_event(debug_info_t * id, int level,
+ unsigned int tag)
+{
+ long flags;
+ debug_entry_t *active = NULL;
+
+ if ((!id) || (level > id->level))
+ goto out;
+ spin_lock_irqsave(&id->lock, flags);
+ active = debug_common(id);
+ active->id.fields.exception = 0;
+ memset(DEBUG_DATA(active), 0, id->buf_size);
+ memcpy(DEBUG_DATA(active), &tag, MIN(sizeof(unsigned int), id->buf_size));
+ proceed_active_entry(id);
+ spin_unlock_irqrestore(&id->lock, flags);
+ out:
+ return active;
+}
+
+/*
+ * debug_text_event:
+ */
+
+debug_entry_t *debug_text_event(debug_info_t * id, int level,
+ const char *txt)
+{
+ long flags;
+ debug_entry_t *active = NULL;
+
+ if ((!id) || (level > id->level))
+ goto out;
+ spin_lock_irqsave(&id->lock, flags);
+ active = debug_common(id);
+ memset(DEBUG_DATA(active), 0, id->buf_size);
+ strncpy(DEBUG_DATA(active), txt, MIN(strlen(txt), id->buf_size));
+ active->id.fields.exception = 0;
+ proceed_active_entry(id);
+ spin_unlock_irqrestore(&id->lock, flags);
+ out:
+ return active;
+
+}
+
+/*
+ * debug_exception:
+ */
+
+debug_entry_t *debug_exception(debug_info_t * id, int level, void *buf,
+ int len)
+{
+ long flags;
+ debug_entry_t *active = NULL;
+
+ if ((!id) || (level > id->level))
+ goto out;
+ spin_lock_irqsave(&id->lock, flags);
+ active = debug_common(id);
+ active->id.fields.exception = 1;
+ memset(DEBUG_DATA(active), 0, id->buf_size);
+ memcpy(DEBUG_DATA(active), buf, MIN(len, id->buf_size));
+ proceed_active_entry(id);
+ proceed_active_area(id);
+ spin_unlock_irqrestore(&id->lock, flags);
+ out:
+ return active;
+}
+
+/*
+ * debug_int_exception:
+ */
+
+debug_entry_t *debug_int_exception(debug_info_t * id, int level,
+ unsigned int tag)
+{
+ long flags;
+ debug_entry_t *active = NULL;
+
+ if ((!id) || (level > id->level))
+ goto out;
+ spin_lock_irqsave(&id->lock, flags);
+ active = debug_common(id);
+ active->id.fields.exception = 1;
+ memset(DEBUG_DATA(active), 0, id->buf_size);
+ memcpy(DEBUG_DATA(active), &tag,
+ MIN(sizeof(unsigned int), id->buf_size));
+ proceed_active_entry(id);
+ proceed_active_area(id);
+ spin_unlock_irqrestore(&id->lock, flags);
+ out:
+ return active;
+}
+
+/*
+ * debug_text_exception:
+ */
+
+debug_entry_t *debug_text_exception(debug_info_t * id, int level,
+ const char *txt)
+{
+ long flags;
+ debug_entry_t *active = NULL;
+
+ if ((!id) || (level > id->level))
+ goto out;
+ spin_lock_irqsave(&id->lock, flags);
+ active = debug_common(id);
+ memset(DEBUG_DATA(active), 0, id->buf_size);
+ strncpy(DEBUG_DATA(active), txt, MIN(strlen(txt), id->buf_size));
+ active->id.fields.exception = 1;
+ proceed_active_entry(id);
+ proceed_active_area(id);
+ spin_unlock_irqrestore(&id->lock, flags);
+ out:
+ return active;
+
+}
+
+/*
+ * debug_init:
+ * - is called exactly once to initialize the debug feature
+ */
+
+int debug_init(void)
+{
+ int rc = 0;
+
+ down(&debug_lock);
+ if (!initialized) {
+ 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);
+ 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;
+ 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/%s\n",
+ 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;
+ 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 (out_buf == NULL) {
+ rc = 2;
+ goto out;
+ }
+ if(id->level == -1) rc = sprintf(out_buf,"-\n");
+ else rc = sprintf(out_buf, "%i\n", id->level);
+ out:
+ 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 ((rc = copy_from_user(input_buf, user_buf, 1)))
+ 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 */
+}
+
+/*
+ * 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);
+ if (out_buf == NULL)
+ goto out;
+ memcpy(out_buf,entry,sizeof(debug_entry_t));
+ out:
+ 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;
+ if (out_buf == NULL || in_buf == NULL)
+ goto out;
+ memcpy(out_buf, in_buf, id->buf_size);
+ out:
+ 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;
+
+ if (out_buf == NULL || in_buf == NULL) {
+ rc = id->buf_size * 4 + 3;
+ goto out;
+ }
+ 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");
+ out:
+ 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;
+
+ if (out_buf == NULL) {
+ rc = DEBUG_PROC_HEADER_SIZE;
+ goto out;
+ }
+
+ 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 %1s %02i %016lx ",
+ area, time_val.tv_sec,
+ time_val.tv_usec, except_str,
+ entry->id.fields.cpuid, caller);
+#else
+ caller &= 0x7fffffff;
+ rc += sprintf(out_buf, "%02i %011lu:%06lu %1s %02i %08lx ",
+ area, time_val.tv_sec,
+ time_val.tv_usec, except_str,
+ entry->id.fields.cpuid, caller);
+#endif
+ 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
+ debug_delete_proc_dir_entry(&proc_root, debug_proc_root_entry);
+ return;
+}
+
+#endif /* MODULE */
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)