1 files changed, 306 insertions, 0 deletions

diff --git a/sound/core/memory.c b/sound/core/memory.c
new file mode 100644
index 000000000000..20860fec9364
--- /dev/null
+++ b/sound/core/memory.c
@@ -0,0 +1,306 @@
+/*
+ *  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
+}