307 lines
7.7 KiB
C
307 lines
7.7 KiB
C
/*
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* Copyright (c) by Jaroslav Kysela <perex@suse.cz>
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*
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* Memory allocation helpers.
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <sound/driver.h>
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#include <asm/io.h>
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#include <asm/uaccess.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/time.h>
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#include <linux/pci.h>
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#include <sound/core.h>
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#include <sound/info.h>
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/*
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* memory allocation helpers and debug routines
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*/
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#ifdef CONFIG_SND_DEBUG_MEMORY
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struct snd_alloc_track {
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unsigned long magic;
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void *caller;
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size_t size;
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struct list_head list;
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long data[0];
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};
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#define snd_alloc_track_entry(obj) (struct snd_alloc_track *)((char*)obj - (unsigned long)((struct snd_alloc_track *)0)->data)
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static long snd_alloc_kmalloc;
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static long snd_alloc_vmalloc;
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static LIST_HEAD(snd_alloc_kmalloc_list);
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static LIST_HEAD(snd_alloc_vmalloc_list);
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static DEFINE_SPINLOCK(snd_alloc_kmalloc_lock);
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static DEFINE_SPINLOCK(snd_alloc_vmalloc_lock);
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#define KMALLOC_MAGIC 0x87654321
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#define VMALLOC_MAGIC 0x87654320
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static snd_info_entry_t *snd_memory_info_entry;
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void snd_memory_init(void)
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{
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snd_alloc_kmalloc = 0;
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snd_alloc_vmalloc = 0;
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}
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void snd_memory_done(void)
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{
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struct list_head *head;
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struct snd_alloc_track *t;
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if (snd_alloc_kmalloc > 0)
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snd_printk(KERN_ERR "Not freed snd_alloc_kmalloc = %li\n", snd_alloc_kmalloc);
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if (snd_alloc_vmalloc > 0)
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snd_printk(KERN_ERR "Not freed snd_alloc_vmalloc = %li\n", snd_alloc_vmalloc);
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list_for_each_prev(head, &snd_alloc_kmalloc_list) {
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t = list_entry(head, struct snd_alloc_track, list);
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if (t->magic != KMALLOC_MAGIC) {
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snd_printk(KERN_ERR "Corrupted kmalloc\n");
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break;
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}
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snd_printk(KERN_ERR "kmalloc(%ld) from %p not freed\n", (long) t->size, t->caller);
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}
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list_for_each_prev(head, &snd_alloc_vmalloc_list) {
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t = list_entry(head, struct snd_alloc_track, list);
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if (t->magic != VMALLOC_MAGIC) {
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snd_printk(KERN_ERR "Corrupted vmalloc\n");
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break;
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}
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snd_printk(KERN_ERR "vmalloc(%ld) from %p not freed\n", (long) t->size, t->caller);
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}
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}
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static void *__snd_kmalloc(size_t size, int flags, void *caller)
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{
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unsigned long cpu_flags;
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struct snd_alloc_track *t;
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void *ptr;
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ptr = snd_wrapper_kmalloc(size + sizeof(struct snd_alloc_track), flags);
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if (ptr != NULL) {
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t = (struct snd_alloc_track *)ptr;
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t->magic = KMALLOC_MAGIC;
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t->caller = caller;
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spin_lock_irqsave(&snd_alloc_kmalloc_lock, cpu_flags);
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list_add_tail(&t->list, &snd_alloc_kmalloc_list);
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spin_unlock_irqrestore(&snd_alloc_kmalloc_lock, cpu_flags);
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t->size = size;
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snd_alloc_kmalloc += size;
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ptr = t->data;
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}
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return ptr;
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}
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#define _snd_kmalloc(size, flags) __snd_kmalloc((size), (flags), __builtin_return_address(0));
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void *snd_hidden_kmalloc(size_t size, int flags)
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{
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return _snd_kmalloc(size, flags);
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}
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void *snd_hidden_kcalloc(size_t n, size_t size, int flags)
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{
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void *ret = NULL;
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if (n != 0 && size > INT_MAX / n)
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return ret;
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ret = _snd_kmalloc(n * size, flags);
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if (ret)
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memset(ret, 0, n * size);
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return ret;
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}
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void snd_hidden_kfree(const void *obj)
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{
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unsigned long flags;
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struct snd_alloc_track *t;
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if (obj == NULL)
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return;
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t = snd_alloc_track_entry(obj);
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if (t->magic != KMALLOC_MAGIC) {
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snd_printk(KERN_WARNING "bad kfree (called from %p)\n", __builtin_return_address(0));
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return;
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}
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spin_lock_irqsave(&snd_alloc_kmalloc_lock, flags);
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list_del(&t->list);
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spin_unlock_irqrestore(&snd_alloc_kmalloc_lock, flags);
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t->magic = 0;
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snd_alloc_kmalloc -= t->size;
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obj = t;
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snd_wrapper_kfree(obj);
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}
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void *snd_hidden_vmalloc(unsigned long size)
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{
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void *ptr;
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ptr = snd_wrapper_vmalloc(size + sizeof(struct snd_alloc_track));
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if (ptr) {
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struct snd_alloc_track *t = (struct snd_alloc_track *)ptr;
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t->magic = VMALLOC_MAGIC;
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t->caller = __builtin_return_address(0);
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spin_lock(&snd_alloc_vmalloc_lock);
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list_add_tail(&t->list, &snd_alloc_vmalloc_list);
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spin_unlock(&snd_alloc_vmalloc_lock);
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t->size = size;
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snd_alloc_vmalloc += size;
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ptr = t->data;
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}
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return ptr;
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}
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void snd_hidden_vfree(void *obj)
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{
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struct snd_alloc_track *t;
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if (obj == NULL)
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return;
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t = snd_alloc_track_entry(obj);
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if (t->magic != VMALLOC_MAGIC) {
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snd_printk(KERN_ERR "bad vfree (called from %p)\n", __builtin_return_address(0));
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return;
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}
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spin_lock(&snd_alloc_vmalloc_lock);
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list_del(&t->list);
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spin_unlock(&snd_alloc_vmalloc_lock);
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t->magic = 0;
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snd_alloc_vmalloc -= t->size;
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obj = t;
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snd_wrapper_vfree(obj);
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}
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static void snd_memory_info_read(snd_info_entry_t *entry, snd_info_buffer_t * buffer)
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{
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snd_iprintf(buffer, "kmalloc: %li bytes\n", snd_alloc_kmalloc);
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snd_iprintf(buffer, "vmalloc: %li bytes\n", snd_alloc_vmalloc);
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}
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int __init snd_memory_info_init(void)
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{
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snd_info_entry_t *entry;
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entry = snd_info_create_module_entry(THIS_MODULE, "meminfo", NULL);
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if (entry) {
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entry->c.text.read_size = 256;
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entry->c.text.read = snd_memory_info_read;
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if (snd_info_register(entry) < 0) {
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snd_info_free_entry(entry);
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entry = NULL;
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}
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}
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snd_memory_info_entry = entry;
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return 0;
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}
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int __exit snd_memory_info_done(void)
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{
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if (snd_memory_info_entry)
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snd_info_unregister(snd_memory_info_entry);
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return 0;
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}
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#else
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#define _snd_kmalloc kmalloc
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#endif /* CONFIG_SND_DEBUG_MEMORY */
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/**
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* snd_kmalloc_strdup - copy the string
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* @string: the original string
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* @flags: allocation conditions, GFP_XXX
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*
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* Allocates a memory chunk via kmalloc() and copies the string to it.
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*
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* Returns the pointer, or NULL if no enoguh memory.
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*/
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char *snd_kmalloc_strdup(const char *string, int flags)
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{
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size_t len;
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char *ptr;
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if (!string)
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return NULL;
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len = strlen(string) + 1;
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ptr = _snd_kmalloc(len, flags);
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if (ptr)
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memcpy(ptr, string, len);
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return ptr;
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}
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/**
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* copy_to_user_fromio - copy data from mmio-space to user-space
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* @dst: the destination pointer on user-space
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* @src: the source pointer on mmio
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* @count: the data size to copy in bytes
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*
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* Copies the data from mmio-space to user-space.
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*
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* Returns zero if successful, or non-zero on failure.
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*/
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int copy_to_user_fromio(void __user *dst, const volatile void __iomem *src, size_t count)
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{
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#if defined(__i386__) || defined(CONFIG_SPARC32)
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return copy_to_user(dst, (const void*)src, count) ? -EFAULT : 0;
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#else
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char buf[256];
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while (count) {
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size_t c = count;
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if (c > sizeof(buf))
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c = sizeof(buf);
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memcpy_fromio(buf, (void __iomem *)src, c);
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if (copy_to_user(dst, buf, c))
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return -EFAULT;
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count -= c;
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dst += c;
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src += c;
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}
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return 0;
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#endif
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}
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/**
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* copy_from_user_toio - copy data from user-space to mmio-space
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* @dst: the destination pointer on mmio-space
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* @src: the source pointer on user-space
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* @count: the data size to copy in bytes
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*
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* Copies the data from user-space to mmio-space.
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*
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* Returns zero if successful, or non-zero on failure.
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*/
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int copy_from_user_toio(volatile void __iomem *dst, const void __user *src, size_t count)
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{
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#if defined(__i386__) || defined(CONFIG_SPARC32)
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return copy_from_user((void*)dst, src, count) ? -EFAULT : 0;
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#else
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char buf[256];
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while (count) {
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size_t c = count;
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if (c > sizeof(buf))
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c = sizeof(buf);
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if (copy_from_user(buf, src, c))
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return -EFAULT;
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memcpy_toio(dst, buf, c);
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count -= c;
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dst += c;
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src += c;
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}
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return 0;
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#endif
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}
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