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memory_debug.c

#define __NO_VERSION__
/*
 *  Memory allocation helpers.
 *
 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
 *
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */

#include "adriver.h"
#include <linux/init.h>
#include <linux/slab.h>
#include <sound/core.h>
#include <sound/info.h>


/*
 *  memory allocation helpers and debug routines
 */

struct snd_alloc_track {
      unsigned long magic;
      void *caller;
      size_t size;
      struct list_head list;
      long data[0];
};

#define snd_alloc_track_entry(obj) (struct snd_alloc_track *)((char*)obj - (unsigned long)((struct snd_alloc_track *)0)->data)

static long snd_alloc_kmalloc;
static LIST_HEAD(snd_alloc_kmalloc_list);
static DEFINE_SPINLOCK(snd_alloc_kmalloc_lock);
#define KMALLOC_MAGIC 0x87654321

void snd_memory_done(void)
{
      struct list_head *head;
      struct snd_alloc_track *t;

      if (snd_alloc_kmalloc > 0)
            printk(KERN_ERR "snd: Not freed snd_alloc_kmalloc = %li\n", snd_alloc_kmalloc);
      list_for_each_prev(head, &snd_alloc_kmalloc_list) {
            t = list_entry(head, struct snd_alloc_track, list);
            if (t->magic != KMALLOC_MAGIC) {
                  printk(KERN_ERR "snd: Corrupted kmalloc\n");
                  break;
            }
            printk(KERN_ERR "snd: kmalloc(%ld) from %p not freed\n", (long) t->size, t->caller);
      }
}

static void *__snd_kmalloc(size_t size, gfp_t gfp_flags, void *caller)
{
      unsigned long flags;
      struct snd_alloc_track *t;
      void *ptr;
      
      ptr = snd_wrapper_kmalloc(size + sizeof(struct snd_alloc_track), gfp_flags);
      if (ptr != NULL) {
            t = (struct snd_alloc_track *)ptr;
            t->magic = KMALLOC_MAGIC;
            t->caller = caller;
            spin_lock_irqsave(&snd_alloc_kmalloc_lock, flags);
            list_add_tail(&t->list, &snd_alloc_kmalloc_list);
            spin_unlock_irqrestore(&snd_alloc_kmalloc_lock, flags);
            t->size = size;
            snd_alloc_kmalloc += size;
            ptr = t->data;
      }
      return ptr;
}

#define _snd_kmalloc(size, flags) __snd_kmalloc((size), (flags), __builtin_return_address(0));
void *snd_hidden_kmalloc(size_t size, gfp_t gfp_flags)
{
      return _snd_kmalloc(size, gfp_flags);
}

void *snd_hidden_kzalloc(size_t size, gfp_t gfp_flags)
{
      void *ret = _snd_kmalloc(size, gfp_flags);
      if (ret)
            memset(ret, 0, size);
      return ret;
}

void *snd_hidden_kcalloc(size_t n, size_t size, gfp_t gfp_flags)
{
      void *ret = NULL;
      if (n != 0 && size > INT_MAX / n)
            return ret;
      return snd_hidden_kzalloc(n * size, gfp_flags);
}

void snd_hidden_kfree(const void *obj)
{
      unsigned long flags;
      struct snd_alloc_track *t;
      if (obj == NULL)
            return;
      t = snd_alloc_track_entry(obj);
      if (t->magic != KMALLOC_MAGIC) {
            printk(KERN_WARNING "snd: bad kfree (called from %p)\n", __builtin_return_address(0));
            return;
      }
      spin_lock_irqsave(&snd_alloc_kmalloc_lock, flags);
      list_del(&t->list);
      spin_unlock_irqrestore(&snd_alloc_kmalloc_lock, flags);
      t->magic = 0;
      snd_alloc_kmalloc -= t->size;
      obj = t;
      snd_wrapper_kfree(obj);
}

char *snd_hidden_kstrdup(const char *s, gfp_t gfp_flags)
{
      int len;
      char *buf;

      if (!s) return NULL;

      len = strlen(s) + 1;
      buf = _snd_kmalloc(len, gfp_flags);
      if (buf)
            memcpy(buf, s, len);
      return buf;
}

char *snd_hidden_kstrndup(const char *s, size_t maxlen, gfp_t gfp_flags)
{
      int len;
      char *buf;

      if (!s) return NULL;

      len = strlen(s);
      if (len > maxlen)
            len = maxlen;
      buf = _snd_kmalloc(len + 1, gfp_flags);
      if (buf) {
            memcpy(buf, s, len);
            buf[len] = 0;
      }
      return buf;
}

#ifdef CONFIG_PROC_FS
static struct snd_info_entry *snd_memory_info_entry;

static void snd_memory_info_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer)
{
      snd_iprintf(buffer, "kmalloc: %li bytes\n", snd_alloc_kmalloc);
}

#define PROC_FILE_NAME  "driver/snd-memory-debug"

int __init snd_memory_info_init(void)
{
      struct snd_info_entry *entry;

      entry = snd_info_create_module_entry(THIS_MODULE, "meminfo", NULL);
      if (entry) {
            entry->c.text.read = snd_memory_info_read;
            if (snd_info_register(entry) < 0) {
                  snd_info_free_entry(entry);
                  entry = NULL;
            }
      }
      snd_memory_info_entry = entry;
      return 0;
}

void __exit snd_memory_info_done(void)
{
      snd_info_free_entry(snd_memory_info_entry);
}
#endif

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