/*
* 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 DEFINE_SPINLOCK(snd_alloc_kmalloc_lock);
static DEFINE_SPINLOCK(snd_alloc_vmalloc_lock);
#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
}
