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Sourcecode: alsa-driver version File versions

memory.c

/*
 *  Copyright (c) by Jaroslav Kysela <perex@suse.cz>
 * 
 *  Memory allocation helpers.
 *
 *
 *   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 <sound/driver.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/time.h>
#include <linux/pci.h>
#include <sound/core.h>
#include <sound/info.h>

/*
 *  memory allocation helpers and debug routines
 */

#ifdef CONFIG_SND_DEBUG_MEMORY

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 long snd_alloc_vmalloc;
static LIST_HEAD(snd_alloc_kmalloc_list);
static LIST_HEAD(snd_alloc_vmalloc_list);
static spinlock_t snd_alloc_kmalloc_lock = SPIN_LOCK_UNLOCKED;
static spinlock_t snd_alloc_vmalloc_lock = SPIN_LOCK_UNLOCKED;
#define KMALLOC_MAGIC 0x87654321
#define VMALLOC_MAGIC 0x87654320
static snd_info_entry_t *snd_memory_info_entry;

void snd_memory_init(void)
{
      snd_alloc_kmalloc = 0;
      snd_alloc_vmalloc = 0;
}

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

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

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

void *snd_hidden_kcalloc(size_t n, size_t size, int flags)
{
      void *ret = NULL;
      if (n != 0 && size > INT_MAX / n)
            return ret;
      ret = _snd_kmalloc(n * size, flags);
      if (ret)
            memset(ret, 0, n * size);
      return ret;
}

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) {
            snd_printk(KERN_WARNING "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);
}

void *snd_hidden_vmalloc(unsigned long size)
{
      void *ptr;
      ptr = snd_wrapper_vmalloc(size + sizeof(struct snd_alloc_track));
      if (ptr) {
            struct snd_alloc_track *t = (struct snd_alloc_track *)ptr;
            t->magic = VMALLOC_MAGIC;
            t->caller = __builtin_return_address(0);
            spin_lock(&snd_alloc_vmalloc_lock);
            list_add_tail(&t->list, &snd_alloc_vmalloc_list);
            spin_unlock(&snd_alloc_vmalloc_lock);
            t->size = size;
            snd_alloc_vmalloc += size;
            ptr = t->data;
      }
      return ptr;
}

void snd_hidden_vfree(void *obj)
{
      struct snd_alloc_track *t;
      if (obj == NULL)
            return;
      t = snd_alloc_track_entry(obj);
      if (t->magic != VMALLOC_MAGIC) {
            snd_printk(KERN_ERR "bad vfree (called from %p)\n", __builtin_return_address(0));
            return;
      }
      spin_lock(&snd_alloc_vmalloc_lock);
      list_del(&t->list);
      spin_unlock(&snd_alloc_vmalloc_lock);
      t->magic = 0;
      snd_alloc_vmalloc -= t->size;
      obj = t;
      snd_wrapper_vfree(obj);
}

static void snd_memory_info_read(snd_info_entry_t *entry, snd_info_buffer_t * buffer)
{
      snd_iprintf(buffer, "kmalloc: %li bytes\n", snd_alloc_kmalloc);
      snd_iprintf(buffer, "vmalloc: %li bytes\n", snd_alloc_vmalloc);
}

int __init snd_memory_info_init(void)
{
      snd_info_entry_t *entry;

      entry = snd_info_create_module_entry(THIS_MODULE, "meminfo", NULL);
      if (entry) {
            entry->c.text.read_size = 256;
            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;
}

int __exit snd_memory_info_done(void)
{
      if (snd_memory_info_entry)
            snd_info_unregister(snd_memory_info_entry);
      return 0;
}

#else

#define _snd_kmalloc kmalloc

#endif /* CONFIG_SND_DEBUG_MEMORY */

/**
 * snd_kmalloc_strdup - copy the string
 * @string: the original string
 * @flags: allocation conditions, GFP_XXX
 *
 * Allocates a memory chunk via kmalloc() and copies the string to it.
 *
 * Returns the pointer, or NULL if no enoguh memory.
 */
char *snd_kmalloc_strdup(const char *string, int flags)
{
      size_t len;
      char *ptr;

      if (!string)
            return NULL;
      len = strlen(string) + 1;
      ptr = _snd_kmalloc(len, flags);
      if (ptr)
            memcpy(ptr, string, len);
      return ptr;
}

/**
 * copy_to_user_fromio - copy data from mmio-space to user-space
 * @dst: the destination pointer on user-space
 * @src: the source pointer on mmio
 * @count: the data size to copy in bytes
 *
 * Copies the data from mmio-space to user-space.
 *
 * Returns zero if successful, or non-zero on failure.
 */
int copy_to_user_fromio(void __user *dst, const volatile void __iomem *src, size_t count)
{
#if defined(__i386__) || defined(CONFIG_SPARC32)
      return copy_to_user(dst, (const void*)src, count) ? -EFAULT : 0;
#else
      char buf[256];
      while (count) {
            size_t c = count;
            if (c > sizeof(buf))
                  c = sizeof(buf);
            memcpy_fromio(buf, (void __iomem *)src, c);
            if (copy_to_user(dst, buf, c))
                  return -EFAULT;
            count -= c;
            dst += c;
            src += c;
      }
      return 0;
#endif
}

/**
 * copy_from_user_toio - copy data from user-space to mmio-space
 * @dst: the destination pointer on mmio-space
 * @src: the source pointer on user-space
 * @count: the data size to copy in bytes
 *
 * Copies the data from user-space to mmio-space.
 *
 * Returns zero if successful, or non-zero on failure.
 */
int copy_from_user_toio(volatile void __iomem *dst, const void __user *src, size_t count)
{
#if defined(__i386__) || defined(CONFIG_SPARC32)
      return copy_from_user((void*)dst, src, count) ? -EFAULT : 0;
#else
      char buf[256];
      while (count) {
            size_t c = count;
            if (c > sizeof(buf))
                  c = sizeof(buf);
            if (copy_from_user(buf, src, c))
                  return -EFAULT;
            memcpy_toio(dst, buf, c);
            count -= c;
            dst += c;
            src += c;
      }
      return 0;
#endif
}

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