ion: move into staging

Move ion from drivers/gpu/ion to drivers/android/staging/ion.

Change-Id: Id6e996aa3954cbb8e1a8abc9578a56204f5eb211
Signed-off-by: Colin Cross <ccross@android.com>

17 files changed, 4132 insertions, 0 deletions

diff --git a/drivers/staging/android/Kconfig b/drivers/staging/android/Kconfig
index fe11eb6fa96..6da535db253 100644
--- a/drivers/staging/android/Kconfig
+++ b/drivers/staging/android/Kconfig
@@ -108,6 +108,8 @@ config SW_SYNC_USER
 	  *WARNING* improper use of this can result in deadlocking kernel
 	  drivers from userspace.
 
+source "drivers/staging/android/ion/Kconfig"
+
 endif # if ANDROID
 
 endmenu
diff --git a/drivers/staging/android/Makefile b/drivers/staging/android/Makefile
index c136299e05a..0a01e191490 100644
--- a/drivers/staging/android/Makefile
+++ b/drivers/staging/android/Makefile
@@ -1,5 +1,7 @@
 ccflags-y += -I$(src)			# needed for trace events
 
+obj-y					+= ion/
+
 obj-$(CONFIG_ANDROID_BINDER_IPC)	+= binder.o
 obj-$(CONFIG_ASHMEM)			+= ashmem.o
 obj-$(CONFIG_ANDROID_LOGGER)		+= logger.o
diff --git a/drivers/staging/android/ion/Kconfig b/drivers/staging/android/ion/Kconfig
new file mode 100644
index 00000000000..c62f2cbb9e8
--- /dev/null
+++ b/drivers/staging/android/ion/Kconfig
@@ -0,0 +1,14 @@
+menuconfig ION
+	tristate "Ion Memory Manager"
+	depends on ARM
+	select GENERIC_ALLOCATOR
+	select DMA_SHARED_BUFFER
+	help
+	  Chose this option to enable the ION Memory Manager.
+
+config ION_TEGRA
+	tristate "Ion for Tegra"
+	depends on ARCH_TEGRA && ION
+	help
+	  Choose this option if you wish to use ion on an nVidia Tegra.
+
diff --git a/drivers/staging/android/ion/Makefile b/drivers/staging/android/ion/Makefile
new file mode 100644
index 00000000000..9c956659124
--- /dev/null
+++ b/drivers/staging/android/ion/Makefile
@@ -0,0 +1,6 @@
+obj-$(CONFIG_ION) +=	ion.o ion_heap.o ion_page_pool.o ion_system_heap.o \
+			ion_carveout_heap.o ion_chunk_heap.o ion_cma_heap.o
+ifdef CONFIG_COMPAT
+obj-$(CONFIG_ION) += compat_ion.o
+endif
+obj-$(CONFIG_ION_TEGRA) += tegra/
diff --git a/drivers/staging/android/ion/compat_ion.c b/drivers/staging/android/ion/compat_ion.c
new file mode 100644
index 00000000000..0416fabfc1b
--- /dev/null
+++ b/drivers/staging/android/ion/compat_ion.c
@@ -0,0 +1,172 @@
+/*
+ * drivers/gpu/ion/compat_ion.c
+ *
+ * Copyright (C) 2013 Google, Inc.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ *
+ */
+
+#include <linux/compat.h>
+#include <linux/fs.h>
+#include <linux/uaccess.h>
+
+#include "ion.h"
+#include "compat_ion.h"
+
+/* See drivers/staging/android/uapi/ion.h for the definition of these structs */
+struct compat_ion_allocation_data {
+	compat_size_t len;
+	compat_size_t align;
+	compat_uint_t heap_id_mask;
+	compat_uint_t flags;
+	compat_int_t handle;
+};
+
+struct compat_ion_custom_data {
+	compat_uint_t cmd;
+	compat_ulong_t arg;
+};
+
+static int compat_get_ion_allocation_data(
+			struct compat_ion_allocation_data __user *data32,
+			struct ion_allocation_data __user *data)
+{
+	compat_size_t s;
+	compat_uint_t u;
+	compat_int_t i;
+	int err;
+
+	err = get_user(s, &data32->len);
+	err |= put_user(s, &data->len);
+	err |= get_user(s, &data32->align);
+	err |= put_user(s, &data->align);
+	err |= get_user(u, &data32->heap_id_mask);
+	err |= put_user(u, &data->heap_id_mask);
+	err |= get_user(u, &data32->flags);
+	err |= put_user(u, &data->flags);
+	err |= get_user(i, &data32->handle);
+	err |= put_user(i, &data->handle);
+
+	return err;
+}
+
+static int compat_put_ion_allocation_data(
+			struct compat_ion_allocation_data __user *data32,
+			struct ion_allocation_data __user *data)
+{
+	compat_size_t s;
+	compat_uint_t u;
+	compat_int_t i;
+	int err;
+
+	err = get_user(s, &data->len);
+	err |= put_user(s, &data32->len);
+	err |= get_user(s, &data->align);
+	err |= put_user(s, &data32->align);
+	err |= get_user(u, &data->heap_id_mask);
+	err |= put_user(u, &data32->heap_id_mask);
+	err |= get_user(u, &data->flags);
+	err |= put_user(u, &data32->flags);
+	err |= get_user(i, &data->handle);
+	err |= put_user(i, &data32->handle);
+
+	return err;
+}
+
+static int compat_get_ion_custom_data(
+			struct compat_ion_custom_data __user *data32,
+			struct ion_custom_data __user *data)
+{
+        compat_uint_t cmd;
+        compat_ulong_t arg;
+	int err;
+
+	err = get_user(cmd, &data32->cmd);
+	err |= put_user(cmd, &data->cmd);
+	err |= get_user(arg, &data32->arg);
+	err |= put_user(arg, &data->arg);
+
+	return err;
+};
+
+long compat_ion_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
+{
+	long ret;
+
+	if (!filp->f_op || !filp->f_op->unlocked_ioctl)
+		return -ENOTTY;
+
+	switch (cmd) {
+	case ION_IOC_ALLOC:
+	{
+		struct compat_ion_allocation_data __user *data32;
+		struct ion_allocation_data __user *data;
+		int err;
+
+		data32 = compat_ptr(arg);
+		data = compat_alloc_user_space(sizeof(*data));
+		if (data == NULL)
+			return -EFAULT;
+
+		err = compat_get_ion_allocation_data(data32, data);
+		if (err)
+			return err;
+
+		ret = filp->f_op->unlocked_ioctl(filp, cmd,
+							(unsigned long)data);
+		err = compat_put_ion_allocation_data(data32, data);
+		return ret ? ret : err;
+	}
+	case ION_IOC_FREE:
+	{
+		struct compat_ion_allocation_data __user *data32;
+		struct ion_allocation_data __user *data;
+		int err;
+
+		data32 = compat_ptr(arg);
+		data = compat_alloc_user_space(sizeof(*data));
+		if (data == NULL)
+			return -EFAULT;
+
+		err = compat_get_ion_allocation_data(data32, data);
+		if (err)
+			return err;
+
+		return filp->f_op->unlocked_ioctl(filp, cmd,
+							(unsigned long)data);
+	}
+	case ION_IOC_CUSTOM: {
+		struct compat_ion_custom_data __user *data32;
+		struct ion_custom_data __user *data;
+		int err;
+
+		data32 = compat_ptr(arg);
+		data = compat_alloc_user_space(sizeof(*data));
+		if (data == NULL)
+			return -EFAULT;
+
+		err = compat_get_ion_custom_data(data32, data);
+		if (err)
+			return err;
+
+		return filp->f_op->unlocked_ioctl(filp, cmd,
+							(unsigned long)data);
+	}
+	case ION_IOC_SHARE:
+	case ION_IOC_MAP:
+	case ION_IOC_IMPORT:
+	case ION_IOC_SYNC:
+		return filp->f_op->unlocked_ioctl(filp, cmd,
+						(unsigned long)compat_ptr(arg));
+	default:
+		return -ENOIOCTLCMD;
+	}
+}
diff --git a/drivers/staging/android/ion/compat_ion.h b/drivers/staging/android/ion/compat_ion.h
new file mode 100644
index 00000000000..3a9c8c08c24
--- /dev/null
+++ b/drivers/staging/android/ion/compat_ion.h
@@ -0,0 +1,30 @@
+/*
+
+ * drivers/gpu/ion/compat_ion.h
+ *
+ * Copyright (C) 2013 Google, Inc.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ *
+ */
+
+#ifndef _LINUX_COMPAT_ION_H
+#define _LINUX_COMPAT_ION_H
+
+#if IS_ENABLED(CONFIG_COMPAT)
+
+long compat_ion_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
+
+#else
+
+#define compat_ion_ioctl  NULL
+
+#endif /* CONFIG_COMPAT */
+#endif /* _LINUX_COMPAT_ION_H */
diff --git a/drivers/staging/android/ion/ion.c b/drivers/staging/android/ion/ion.c
new file mode 100644
index 00000000000..5c886fc9cd7
--- /dev/null
+++ b/drivers/staging/android/ion/ion.c
@@ -0,0 +1,1497 @@
+/*
+
+ * drivers/gpu/ion/ion.c
+ *
+ * Copyright (C) 2011 Google, Inc.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ *
+ */
+
+#include <linux/device.h>
+#include <linux/file.h>
+#include <linux/freezer.h>
+#include <linux/fs.h>
+#include <linux/anon_inodes.h>
+#include <linux/kthread.h>
+#include <linux/list.h>
+#include <linux/memblock.h>
+#include <linux/miscdevice.h>
+#include <linux/export.h>
+#include <linux/mm.h>
+#include <linux/mm_types.h>
+#include <linux/rbtree.h>
+#include <linux/slab.h>
+#include <linux/seq_file.h>
+#include <linux/uaccess.h>
+#include <linux/vmalloc.h>
+#include <linux/debugfs.h>
+#include <linux/dma-buf.h>
+#include <linux/idr.h>
+
+#include "ion.h"
+#include "ion_priv.h"
+#include "compat_ion.h"
+
+/**
+ * struct ion_device - the metadata of the ion device node
+ * @dev:		the actual misc device
+ * @buffers:		an rb tree of all the existing buffers
+ * @buffer_lock:	lock protecting the tree of buffers
+ * @lock:		rwsem protecting the tree of heaps and clients
+ * @heaps:		list of all the heaps in the system
+ * @user_clients:	list of all the clients created from userspace
+ */
+struct ion_device {
+	struct miscdevice dev;
+	struct rb_root buffers;
+	struct mutex buffer_lock;
+	struct rw_semaphore lock;
+	struct plist_head heaps;
+	long (*custom_ioctl) (struct ion_client *client, unsigned int cmd,
+			      unsigned long arg);
+	struct rb_root clients;
+	struct dentry *debug_root;
+};
+
+/**
+ * struct ion_client - a process/hw block local address space
+ * @node:		node in the tree of all clients
+ * @dev:		backpointer to ion device
+ * @handles:		an rb tree of all the handles in this client
+ * @idr:		an idr space for allocating handle ids
+ * @lock:		lock protecting the tree of handles
+ * @name:		used for debugging
+ * @task:		used for debugging
+ *
+ * A client represents a list of buffers this client may access.
+ * The mutex stored here is used to protect both handles tree
+ * as well as the handles themselves, and should be held while modifying either.
+ */
+struct ion_client {
+	struct rb_node node;
+	struct ion_device *dev;
+	struct rb_root handles;
+	struct idr idr;
+	struct mutex lock;
+	const char *name;
+	struct task_struct *task;
+	pid_t pid;
+	struct dentry *debug_root;
+};
+
+/**
+ * ion_handle - a client local reference to a buffer
+ * @ref:		reference count
+ * @client:		back pointer to the client the buffer resides in
+ * @buffer:		pointer to the buffer
+ * @node:		node in the client's handle rbtree
+ * @kmap_cnt:		count of times this client has mapped to kernel
+ * @id:			client-unique id allocated by client->idr
+ *
+ * Modifications to node, map_cnt or mapping should be protected by the
+ * lock in the client.  Other fields are never changed after initialization.
+ */
+struct ion_handle {
+	struct kref ref;
+	struct ion_client *client;
+	struct ion_buffer *buffer;
+	struct rb_node node;
+	unsigned int kmap_cnt;
+	int id;
+};
+
+bool ion_buffer_fault_user_mappings(struct ion_buffer *buffer)
+{
+	return ((buffer->flags & ION_FLAG_CACHED) &&
+		!(buffer->flags & ION_FLAG_CACHED_NEEDS_SYNC));
+}
+
+bool ion_buffer_cached(struct ion_buffer *buffer)
+{
+	return !!(buffer->flags & ION_FLAG_CACHED);
+}
+
+static inline struct page *ion_buffer_page(struct page *page)
+{
+	return (struct page *)((unsigned long)page & ~(1UL));
+}
+
+static inline bool ion_buffer_page_is_dirty(struct page *page)
+{
+	return !!((unsigned long)page & 1UL);
+}
+
+static inline void ion_buffer_page_dirty(struct page **page)
+{
+	*page = (struct page *)((unsigned long)(*page) | 1UL);
+}
+
+static inline void ion_buffer_page_clean(struct page **page)
+{
+	*page = (struct page *)((unsigned long)(*page) & ~(1UL));
+}
+
+/* this function should only be called while dev->lock is held */
+static void ion_buffer_add(struct ion_device *dev,
+			   struct ion_buffer *buffer)
+{
+	struct rb_node **p = &dev->buffers.rb_node;
+	struct rb_node *parent = NULL;
+	struct ion_buffer *entry;
+
+	while (*p) {
+		parent = *p;
+		entry = rb_entry(parent, struct ion_buffer, node);
+
+		if (buffer < entry) {
+			p = &(*p)->rb_left;
+		} else if (buffer > entry) {
+			p = &(*p)->rb_right;
+		} else {
+			pr_err("%s: buffer already found.", __func__);
+			BUG();
+		}
+	}
+
+	rb_link_node(&buffer->node, parent, p);
+	rb_insert_color(&buffer->node, &dev->buffers);
+}
+
+/* this function should only be called while dev->lock is held */
+static struct ion_buffer *ion_buffer_create(struct ion_heap *heap,
+				     struct ion_device *dev,
+				     unsigned long len,
+				     unsigned long align,
+				     unsigned long flags)
+{
+	struct ion_buffer *buffer;
+	struct sg_table *table;
+	struct scatterlist *sg;
+	int i, ret;
+
+	buffer = kzalloc(sizeof(struct ion_buffer), GFP_KERNEL);
+	if (!buffer)
+		return ERR_PTR(-ENOMEM);
+
+	buffer->heap = heap;
+	buffer->flags = flags;
+	kref_init(&buffer->ref);
+
+	ret = heap->ops->allocate(heap, buffer, len, align, flags);
+
+	if (ret) {
+		if (!(heap->flags & ION_HEAP_FLAG_DEFER_FREE))
+			goto err2;
+
+		ion_heap_freelist_drain(heap, 0);
+		ret = heap->ops->allocate(heap, buffer, len, align,
+					  flags);
+		if (ret)
+			goto err2;
+	}
+
+	buffer->dev = dev;
+	buffer->size = len;
+
+	table = heap->ops->map_dma(heap, buffer);
+	if (WARN_ONCE(table == NULL, "heap->ops->map_dma should return ERR_PTR on error"))
+		table = ERR_PTR(-EINVAL);
+	if (IS_ERR(table)) {
+		heap->ops->free(buffer);
+		kfree(buffer);
+		return ERR_PTR(PTR_ERR(table));
+	}
+	buffer->sg_table = table;
+	if (ion_buffer_fault_user_mappings(buffer)) {
+		int num_pages = PAGE_ALIGN(buffer->size) / PAGE_SIZE;
+		struct scatterlist *sg;
+		int i, j, k = 0;
+
+		buffer->pages = vmalloc(sizeof(struct page *) * num_pages);
+		if (!buffer->pages) {
+			ret = -ENOMEM;
+			goto err1;
+		}
+
+		for_each_sg(table->sgl, sg, table->nents, i) {
+			struct page *page = sg_page(sg);
+
+			for (j = 0; j < sg_dma_len(sg) / PAGE_SIZE; j++)
+				buffer->pages[k++] = page++;
+		}
+
+		if (ret)
+			goto err;
+	}
+
+	buffer->dev = dev;
+	buffer->size = len;
+	INIT_LIST_HEAD(&buffer->vmas);
+	mutex_init(&buffer->lock);
+	/* this will set up dma addresses for the sglist -- it is not
+	   technically correct as per the dma api -- a specific
+	   device isn't really taking ownership here.  However, in practice on
+	   our systems the only dma_address space is physical addresses.
+	   Additionally, we can't afford the overhead of invalidating every
+	   allocation via dma_map_sg. The implicit contract here is that
+	   memory comming from the heaps is ready for dma, ie if it has a
+	   cached mapping that mapping has been invalidated */
+	for_each_sg(buffer->sg_table->sgl, sg, buffer->sg_table->nents, i)
+		sg_dma_address(sg) = sg_phys(sg);
+	mutex_lock(&dev->buffer_lock);
+	ion_buffer_add(dev, buffer);
+	mutex_unlock(&dev->buffer_lock);
+	return buffer;
+
+err:
+	heap->ops->unmap_dma(heap, buffer);
+	heap->ops->free(buffer);
+err1:
+	if (buffer->pages)
+		vfree(buffer->pages);
+err2:
+	kfree(buffer);
+	return ERR_PTR(ret);
+}
+
+void ion_buffer_destroy(struct ion_buffer *buffer)
+{
+	if (WARN_ON(buffer->kmap_cnt > 0))
+		buffer->heap->ops->unmap_kernel(buffer->heap, buffer);
+	buffer->heap->ops->unmap_dma(buffer->heap, buffer);
+	buffer->heap->ops->free(buffer);
+	if (buffer->pages)
+		vfree(buffer->pages);
+	kfree(buffer);
+}
+
+static void _ion_buffer_destroy(struct kref *kref)
+{
+	struct ion_buffer *buffer = container_of(kref, struct ion_buffer, ref);
+	struct ion_heap *heap = buffer->heap;
+	struct ion_device *dev = buffer->dev;
+
+	mutex_lock(&dev->buffer_lock);
+	rb_erase(&buffer->node, &dev->buffers);
+	mutex_unlock(&dev->buffer_lock);
+
+	if (heap->flags & ION_HEAP_FLAG_DEFER_FREE)
+		ion_heap_freelist_add(heap, buffer);
+	else
+		ion_buffer_destroy(buffer);
+}
+
+static void ion_buffer_get(struct ion_buffer *buffer)
+{
+	kref_get(&buffer->ref);
+}
+
+static int ion_buffer_put(struct ion_buffer *buffer)
+{
+	return kref_put(&buffer->ref, _ion_buffer_destroy);
+}
+
+static void ion_buffer_add_to_handle(struct ion_buffer *buffer)
+{
+	mutex_lock(&buffer->lock);
+	buffer->handle_count++;
+	mutex_unlock(&buffer->lock);
+}
+
+static void ion_buffer_remove_from_handle(struct ion_buffer *buffer)
+{
+	/*
+	 * when a buffer is removed from a handle, if it is not in
+	 * any other handles, copy the taskcomm and the pid of the
+	 * process it's being removed from into the buffer.  At this
+	 * point there will be no way to track what processes this buffer is
+	 * being used by, it only exists as a dma_buf file descriptor.
+	 * The taskcomm and pid can provide a debug hint as to where this fd
+	 * is in the system
+	 */
+	mutex_lock(&buffer->lock);
+	buffer->handle_count--;
+	BUG_ON(buffer->handle_count < 0);
+	if (!buffer->handle_count) {
+		struct task_struct *task;
+
+		task = current->group_leader;
+		get_task_comm(buffer->task_comm, task);
+		buffer->pid = task_pid_nr(task);
+	}
+	mutex_unlock(&buffer->lock);
+}
+
+static struct ion_handle *ion_handle_create(struct ion_client *client,
+				     struct ion_buffer *buffer)
+{
+	struct ion_handle *handle;
+
+	handle = kzalloc(sizeof(struct ion_handle), GFP_KERNEL);
+	if (!handle)
+		return ERR_PTR(-ENOMEM);
+	kref_init(&handle->ref);
+	RB_CLEAR_NODE(&handle->node);
+	handle->client = client;
+	ion_buffer_get(buffer);
+	ion_buffer_add_to_handle(buffer);
+	handle->buffer = buffer;
+
+	return handle;
+}
+
+static void ion_handle_kmap_put(struct ion_handle *);
+
+static void ion_handle_destroy(struct kref *kref)
+{
+	struct ion_handle *handle = container_of(kref, struct ion_handle, ref);
+	struct ion_client *client = handle->client;
+	struct ion_buffer *buffer = handle->buffer;
+
+	mutex_lock(&buffer->lock);
+	while (handle->kmap_cnt)
+		ion_handle_kmap_put(handle);
+	mutex_unlock(&buffer->lock);
+
+	idr_remove(&client->idr, handle->id);
+	if (!RB_EMPTY_NODE(&handle->node))
+		rb_erase(&handle->node, &client->handles);
+
+	ion_buffer_remove_from_handle(buffer);
+	ion_buffer_put(buffer);
+
+	kfree(handle);
+}
+
+struct ion_buffer *ion_handle_buffer(struct ion_handle *handle)
+{
+	return handle->buffer;
+}
+
+static void ion_handle_get(struct ion_handle *handle)
+{
+	kref_get(&handle->ref);
+}
+
+static int ion_handle_put(struct ion_handle *handle)
+{
+	return kref_put(&handle->ref, ion_handle_destroy);
+}
+
+static struct ion_handle *ion_handle_lookup(struct ion_client *client,
+					    struct ion_buffer *buffer)
+{
+	struct rb_node *n = client->handles.rb_node;
+
+	while (n) {
+		struct ion_handle *entry = rb_entry(n, struct ion_handle, node);
+		if (buffer < entry->buffer)
+			n = n->rb_left;
+		else if (buffer > entry->buffer)
+			n = n->rb_right;
+		else
+			return entry;
+	}
+	return ERR_PTR(-EINVAL);
+}
+
+static struct ion_handle *ion_uhandle_get(struct ion_client *client, int id)
+{
+	return idr_find(&client->idr, id);
+}
+
+static bool ion_handle_validate(struct ion_client *client, struct ion_handle *handle)
+{
+	return (ion_uhandle_get(client, handle->id) == handle);
+}
+
+static int ion_handle_add(struct ion_client *client, struct ion_handle *handle)
+{
+	int rc;
+	struct rb_node **p = &client->handles.rb_node;
+	struct rb_node *parent = NULL;
+	struct ion_handle *entry;
+
+	do {
+		int id;
+		rc = idr_pre_get(&client->idr, GFP_KERNEL);
+		if (!rc)
+			return -ENOMEM;
+		rc = idr_get_new_above(&client->idr, handle, 1, &id);
+		handle->id = id;
+	} while (rc == -EAGAIN);
+
+	if (rc < 0)
+		return rc;
+
+	while (*p) {
+		parent = *p;
+		entry = rb_entry(parent, struct ion_handle, node);
+
+		if (handle->buffer < entry->buffer)
+			p = &(*p)->rb_left;
+		else if (handle->buffer > entry->buffer)
+			p = &(*p)->rb_right;
+		else
+			WARN(1, "%s: buffer already found.", __func__);
+	}
+
+	rb_link_node(&handle->node, parent, p);
+	rb_insert_color(&handle->node, &client->handles);
+
+	return 0;
+}
+
+struct ion_handle *ion_alloc(struct ion_client *client, size_t len,
+			     size_t align, unsigned int heap_id_mask,
+			     unsigned int flags)
+{
+	struct ion_handle *handle;
+	struct ion_device *dev = client->dev;
+	struct ion_buffer *buffer = NULL;
+	struct ion_heap *heap;
+	int ret;
+
+	pr_debug("%s: len %d align %d heap_id_mask %u flags %x\n", __func__,
+		 len, align, heap_id_mask, flags);
+	/*
+	 * traverse the list of heaps available in this system in priority
+	 * order.  If the heap type is supported by the client, and matches the
+	 * request of the caller allocate from it.  Repeat until allocate has
+	 * succeeded or all heaps have been tried
+	 */
+	if (WARN_ON(!len))
+		return ERR_PTR(-EINVAL);
+
+	len = PAGE_ALIGN(len);
+
+	down_read(&dev->lock);
+	plist_for_each_entry(heap, &dev->heaps, node) {
+		/* if the caller didn't specify this heap id */
+		if (!((1 << heap->id) & heap_id_mask))
+			continue;
+		buffer = ion_buffer_create(heap, dev, len, align, flags);
+		if (!IS_ERR(buffer))
+			break;
+	}
+	up_read(&dev->lock);
+
+	if (buffer == NULL)
+		return ERR_PTR(-ENODEV);
+
+	if (IS_ERR(buffer))
+		return ERR_PTR(PTR_ERR(buffer));
+
+	handle = ion_handle_create(client, buffer);
+
+	/*
+	 * ion_buffer_create will create a buffer with a ref_cnt of 1,
+	 * and ion_handle_create will take a second reference, drop one here
+	 */
+	ion_buffer_put(buffer);
+
+	if (IS_ERR(handle))
+		return handle;
+
+	mutex_lock(&client->lock);
+	ret = ion_handle_add(client, handle);
+	if (ret) {
+		ion_handle_put(handle);
+		handle = ERR_PTR(ret);
+	}
+	mutex_unlock(&client->lock);
+
+	return handle;
+}
+EXPORT_SYMBOL(ion_alloc);
+
+void ion_free(struct ion_client *client, struct ion_handle *handle)
+{
+	bool valid_handle;
+
+	BUG_ON(client != handle->client);
+
+	mutex_lock(&client->lock);
+	valid_handle = ion_handle_validate(client, handle);
+
+	if (!valid_handle) {
+		WARN(1, "%s: invalid handle passed to free.\n", __func__);
+		mutex_unlock(&client->lock);
+		return;
+	}
+	ion_handle_put(handle);
+	mutex_unlock(&client->lock);
+}
+EXPORT_SYMBOL(ion_free);
+
+int ion_phys(struct ion_client *client, struct ion_handle *handle,
+	     ion_phys_addr_t *addr, size_t *len)
+{
+	struct ion_buffer *buffer;
+	int ret;
+
+	mutex_lock(&client->lock);
+	if (!ion_handle_validate(client, handle)) {
+		mutex_unlock(&client->lock);
+		return -EINVAL;
+	}
+
+	buffer = handle->buffer;
+
+	if (!buffer->heap->ops->phys) {
+		pr_err("%s: ion_phys is not implemented by this heap.\n",
+		       __func__);
+		mutex_unlock(&client->lock);
+		return -ENODEV;
+	}
+	mutex_unlock(&client->lock);
+	ret = buffer->heap->ops->phys(buffer->heap, buffer, addr, len);
+	return ret;
+}
+EXPORT_SYMBOL(ion_phys);
+
+static void *ion_buffer_kmap_get(struct ion_buffer *buffer)
+{
+	void *vaddr;
+
+	if (buffer->kmap_cnt) {
+		buffer->kmap_cnt++;
+		return buffer->vaddr;
+	}
+	vaddr = buffer->heap->ops->map_kernel(buffer->heap, buffer);
+	if (WARN_ONCE(vaddr == NULL, "heap->ops->map_kernel should return ERR_PTR on error"))
+		return ERR_PTR(-EINVAL);
+	if (IS_ERR(vaddr))
+		return vaddr;
+	buffer->vaddr = vaddr;
+	buffer->kmap_cnt++;
+	return vaddr;
+}
+
+static void *ion_handle_kmap_get(struct ion_handle *handle)
+{
+	struct ion_buffer *buffer = handle->buffer;
+	void *vaddr;
+
+	if (handle->kmap_cnt) {
+		handle->kmap_cnt++;
+		return buffer->vaddr;
+	}
+	vaddr = ion_buffer_kmap_get(buffer);
+	if (IS_ERR(vaddr))
+		return vaddr;
+	handle->kmap_cnt++;
+	return vaddr;
+}
+
+static void ion_buffer_kmap_put(struct ion_buffer *buffer)
+{
+	buffer->kmap_cnt--;
+	if (!buffer->kmap_cnt) {
+		buffer->heap->ops->unmap_kernel(buffer->heap, buffer);
+		buffer->vaddr = NULL;
+	}
+}
+
+static void ion_handle_kmap_put(struct ion_handle *handle)
+{
+	struct ion_buffer *buffer = handle->buffer;
+
+	handle->kmap_cnt--;
+	if (!handle->kmap_cnt)
+		ion_buffer_kmap_put(buffer);
+}
+
+void *ion_map_kernel(struct ion_client *client, struct ion_handle *handle)
+{
+	struct ion_buffer *buffer;
+	void *vaddr;
+
+	mutex_lock(&client->lock);
+	if (!ion_handle_validate(client, handle)) {
+		pr_err("%s: invalid handle passed to map_kernel.\n",
+		       __func__);
+		mutex_unlock(&client->lock);
+		return ERR_PTR(-EINVAL);
+	}
+
+	buffer = handle->buffer;
+
+	if (!handle->buffer->heap->ops->map_kernel) {
+		pr_err("%s: map_kernel is not implemented by this heap.\n",
+		       __func__);
+		mutex_unlock(&client->lock);
+		return ERR_PTR(-ENODEV);
+	}
+
+	mutex_lock(&buffer->lock);
+	vaddr = ion_handle_kmap_get(handle);
+	mutex_unlock(&buffer->lock);
+	mutex_unlock(&client->lock);
+	return vaddr;
+}
+EXPORT_SYMBOL(ion_map_kernel);
+
+void ion_unmap_kernel(struct ion_client *client, struct ion_handle *handle)
+{
+	struct ion_buffer *buffer;
+
+	mutex_lock(&client->lock);
+	buffer = handle->buffer;
+	mutex_lock(&buffer->lock);
+	ion_handle_kmap_put(handle);
+	mutex_unlock(&buffer->lock);
+	mutex_unlock(&client->lock);
+}
+EXPORT_SYMBOL(ion_unmap_kernel);
+
+static int ion_debug_client_show(struct seq_file *s, void *unused)
+{
+	struct ion_client *client = s->private;
+	struct rb_node *n;
+	size_t sizes[ION_NUM_HEAP_IDS] = {0};
+	const char *names[ION_NUM_HEAP_IDS] = {0};
+	int i;
+
+	mutex_lock(&client->lock);
+	for (n = rb_first(&client->handles); n; n = rb_next(n)) {
+		struct ion_handle *handle = rb_entry(n, struct ion_handle,
+						     node);
+		unsigned int id = handle->buffer->heap->id;
+
+		if (!names[id])
+			names[id] = handle->buffer->heap->name;
+		sizes[id] += handle->buffer->size;
+	}
+	mutex_unlock(&client->lock);
+
+	seq_printf(s, "%16.16s: %16.16s\n", "heap_name", "size_in_bytes");
+	for (i = 0; i < ION_NUM_HEAP_IDS; i++) {
+		if (!names[i])
+			continue;
+		seq_printf(s, "%16.16s: %16u\n", names[i], sizes[i]);
+	}
+	return 0;
+}
+
+static int ion_debug_client_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, ion_debug_client_show, inode->i_private);
+}
+
+static const struct file_operations debug_client_fops = {
+	.open = ion_debug_client_open,
+	.read = seq_read,
+	.llseek = seq_lseek,
+	.release = single_release,
+};
+
+struct ion_client *ion_client_create(struct ion_device *dev,
+				     const char *name)
+{
+	struct ion_client *client;
+	struct task_struct *task;
+	struct rb_node **p;
+	struct rb_node *parent = NULL;
+	struct ion_client *entry;
+	char debug_name[64];
+	pid_t pid;
+
+	get_task_struct(current->group_leader);
+	task_lock(current->group_leader);
+	pid = task_pid_nr(current->group_leader);
+	/* don't bother to store task struct for kernel threads,
+	   they can't be killed anyway */
+	if (current->group_leader->flags & PF_KTHREAD) {
+		put_task_struct(current->group_leader);
+		task = NULL;
+	} else {
+		task = current->group_leader;
+	}
+	task_unlock(current->group_leader);
+
+	client = kzalloc(sizeof(struct ion_client), GFP_KERNEL);
+	if (!client) {
+		if (task)
+			put_task_struct(current->group_leader);
+		return ERR_PTR(-ENOMEM);
+	}
+
+	client->dev = dev;
+	client->handles = RB_ROOT;
+	idr_init(&client->idr);
+	mutex_init(&client->lock);
+	client->name = name;
+	client->task = task;
+	client->pid = pid;
+
+	down_write(&dev->lock);
+	p = &dev->clients.rb_node;
+	while (*p) {
+		parent = *p;
+		entry = rb_entry(parent, struct ion_client, node);
+
+		if (client < entry)
+			p = &(*p)->rb_left;
+		else if (client > entry)
+			p = &(*p)->rb_right;
+	}
+	rb_link_node(&client->node, parent, p);
+	rb_insert_color(&client->node, &dev->clients);
+
+	snprintf(debug_name, 64, "%u", client->pid);
+	client->debug_root = debugfs_create_file(debug_name, 0664,
+						 dev->debug_root, client,
+						 &debug_client_fops);
+	up_write(&dev->lock);
+
+	return client;
+}
+EXPORT_SYMBOL(ion_client_create);
+
+void ion_client_destroy(struct ion_client *client)
+{
+	struct ion_device *dev = client->dev;
+	struct rb_node *n;
+
+	pr_debug("%s: %d\n", __func__, __LINE__);
+	while ((n = rb_first(&client->handles))) {
+		struct ion_handle *handle = rb_entry(n, struct ion_handle,
+						     node);
+		ion_handle_destroy(&handle->ref);
+	}
+
+	idr_remove_all(&client->idr);
+	idr_destroy(&client->idr);
+
+	down_write(&dev->lock);
+	if (client->task)
+		put_task_struct(client->task);
+	rb_erase(&client->node, &dev->clients);
+	debugfs_remove_recursive(client->debug_root);
+	up_write(&dev->lock);
+
+	kfree(client);
+}
+EXPORT_SYMBOL(ion_client_destroy);
+
+struct sg_table *ion_sg_table(struct ion_client *client,
+			      struct ion_handle *handle)
+{
+	struct ion_buffer *buffer;
+	struct sg_table *table;
+
+	mutex_lock(&client->lock);
+	if (!ion_handle_validate(client, handle)) {
+		pr_err("%s: invalid handle passed to map_dma.\n",
+		       __func__);
+		mutex_unlock(&client->lock);
+		return ERR_PTR(-EINVAL);
+	}
+	buffer = handle->buffer;
+	table = buffer->sg_table;
+	mutex_unlock(&client->lock);
+	return table;
+}
+EXPORT_SYMBOL(ion_sg_table);
+
+static void ion_buffer_sync_for_device(struct ion_buffer *buffer,
+				       struct device *dev,
+				       enum dma_data_direction direction);
+
+static struct sg_table *ion_map_dma_buf(struct dma_buf_attachment *attachment,
+					enum dma_data_direction direction)
+{
+	struct dma_buf *dmabuf = attachment->dmabuf;
+	struct ion_buffer *buffer = dmabuf->priv;
+
+	ion_buffer_sync_for_device(buffer, attachment->dev, direction);
+	return buffer->sg_table;
+}
+
+static void ion_unmap_dma_buf(struct dma_buf_attachment *attachment,
+			      struct sg_table *table,
+			      enum dma_data_direction direction)
+{
+}
+
+struct ion_vma_list {
+	struct list_head list;
+	struct vm_area_struct *vma;
+};
+
+static void ion_buffer_sync_for_device(struct ion_buffer *buffer,
+				       struct device *dev,
+				       enum dma_data_direction dir)
+{
+	struct ion_vma_list *vma_list;
+	int pages = PAGE_ALIGN(buffer->size) / PAGE_SIZE;
+	int i;
+
+	pr_debug("%s: syncing for device %s\n", __func__,
+		 dev ? dev_name(dev) : "null");
+
+	if (!ion_buffer_fault_user_mappings(buffer))
+		return;
+
+	mutex_lock(&buffer->lock);
+	for (i = 0; i < pages; i++) {
+		struct page *page = buffer->pages[i];
+
+		if (ion_buffer_page_is_dirty(page))
+			__dma_page_cpu_to_dev(page, 0, PAGE_SIZE, dir);
+		ion_buffer_page_clean(buffer->pages + i);
+	}
+	list_for_each_entry(vma_list, &buffer->vmas, list) {
+		struct vm_area_struct *vma = vma_list->vma;
+
+		zap_page_range(vma, vma->vm_start, vma->vm_end - vma->vm_start,
+			       NULL);
+	}
+	mutex_unlock(&buffer->lock);
+}
+
+int ion_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
+{
+	struct ion_buffer *buffer = vma->vm_private_data;
+	int ret;
+
+	mutex_lock(&buffer->lock);
+	ion_buffer_page_dirty(buffer->pages + vmf->pgoff);
+
+	BUG_ON(!buffer->pages || !buffer->pages[vmf->pgoff]);
+	ret = vm_insert_page(vma, (unsigned long)vmf->virtual_address,
+			     ion_buffer_page(buffer->pages[vmf->pgoff]));
+	mutex_unlock(&buffer->lock);
+	if (ret)
+		return VM_FAULT_ERROR;
+
+	return VM_FAULT_NOPAGE;
+}
+
+static void ion_vm_open(struct vm_area_struct *vma)
+{
+	struct ion_buffer *buffer = vma->vm_private_data;
+	struct ion_vma_list *vma_list;
+
+	vma_list = kmalloc(sizeof(struct ion_vma_list), GFP_KERNEL);
+	if (!vma_list)
+		return;
+	vma_list->vma = vma;
+	mutex_lock(&buffer->lock);
+	list_add(&vma_list->list, &buffer->vmas);
+	mutex_unlock(&buffer->lock);
+	pr_debug("%s: adding %p\n", __func__, vma);
+}
+
+static void ion_vm_close(struct vm_area_struct *vma)
+{
+	struct ion_buffer *buffer = vma->vm_private_data;
+	struct ion_vma_list *vma_list, *tmp;
+
+	pr_debug("%s\n", __func__);
+	mutex_lock(&buffer->lock);
+	list_for_each_entry_safe(vma_list, tmp, &buffer->vmas, list) {
+		if (vma_list->vma != vma)
+			continue;
+		list_del(&vma_list->list);
+		kfree(vma_list);
+		pr_debug("%s: deleting %p\n", __func__, vma);
+		break;
+	}
+	mutex_unlock(&buffer->lock);
+}
+
+struct vm_operations_struct ion_vma_ops = {
+	.open = ion_vm_open,
+	.close = ion_vm_close,
+	.fault = ion_vm_fault,
+};
+
+static int ion_mmap(struct dma_buf *dmabuf, struct vm_area_struct *vma)
+{
+	struct ion_buffer *buffer = dmabuf->priv;
+	int ret = 0;
+
+	if (!buffer->heap->ops->map_user) {
+		pr_err("%s: this heap does not define a method for mapping "
+		       "to userspace\n", __func__);
+		return -EINVAL;
+	}
+
+	if (ion_buffer_fault_user_mappings(buffer)) {
+		vma->vm_private_data = buffer;
+		vma->vm_ops = &ion_vma_ops;
+		ion_vm_open(vma);
+		return 0;
+	}
+
+	if (!(buffer->flags & ION_FLAG_CACHED))
+		vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
+
+	mutex_lock(&buffer->lock);
+	/* now map it to userspace */
+	ret = buffer->heap->ops->map_user(buffer->heap, buffer, vma);
+	mutex_unlock(&buffer->lock);
+
+	if (ret)
+		pr_err("%s: failure mapping buffer to userspace\n",
+		       __func__);
+
+	return ret;
+}
+
+static void ion_dma_buf_release(struct dma_buf *dmabuf)
+{
+	struct ion_buffer *buffer = dmabuf->priv;
+	ion_buffer_put(buffer);
+}
+
+static void *ion_dma_buf_kmap(struct dma_buf *dmabuf, unsigned long offset)
+{
+	struct ion_buffer *buffer = dmabuf->priv;
+	return buffer->vaddr + offset * PAGE_SIZE;
+}
+
+static void ion_dma_buf_kunmap(struct dma_buf *dmabuf, unsigned long offset,
+			       void *ptr)
+{
+	return;
+}
+
+static int ion_dma_buf_begin_cpu_access(struct dma_buf *dmabuf, size_t start,
+					size_t len,
+					enum dma_data_direction direction)
+{
+	struct ion_buffer *buffer = dmabuf->priv;
+	void *vaddr;
+
+	if (!buffer->heap->ops->map_kernel) {
+		pr_err("%s: map kernel is not implemented by this heap.\n",
+		       __func__);
+		return -ENODEV;
+	}
+
+	mutex_lock(&buffer->lock);
+	vaddr = ion_buffer_kmap_get(buffer);
+	mutex_unlock(&buffer->lock);
+	if (IS_ERR(vaddr))
+		return PTR_ERR(vaddr);
+	return 0;
+}
+
+static void ion_dma_buf_end_cpu_access(struct dma_buf *dmabuf, size_t start,
+				       size_t len,
+				       enum dma_data_direction direction)
+{
+	struct ion_buffer *buffer = dmabuf->priv;
+
+	mutex_lock(&buffer->lock);
+	ion_buffer_kmap_put(buffer);
+	mutex_unlock(&buffer->lock);
+}
+
+struct dma_buf_ops dma_buf_ops = {
+	.map_dma_buf = ion_map_dma_buf,
+	.unmap_dma_buf = ion_unmap_dma_buf,
+	.mmap = ion_mmap,
+	.release = ion_dma_buf_release,
+	.begin_cpu_access = ion_dma_buf_begin_cpu_access,
+	.end_cpu_access = ion_dma_buf_end_cpu_access,
+	.kmap_atomic = ion_dma_buf_kmap,
+	.kunmap_atomic = ion_dma_buf_kunmap,
+	.kmap = ion_dma_buf_kmap,
+	.kunmap = ion_dma_buf_kunmap,
+};
+
+struct dma_buf *ion_share_dma_buf(struct ion_client *client,
+						struct ion_handle *handle)
+{
+	struct ion_buffer *buffer;
+	struct dma_buf *dmabuf;
+	bool valid_handle;
+
+	mutex_lock(&client->lock);
+	valid_handle = ion_handle_validate(client, handle);
+	mutex_unlock(&client->lock);
+	if (!valid_handle) {
+		WARN(1, "%s: invalid handle passed to share.\n", __func__);
+		return ERR_PTR(-EINVAL);
+	}
+
+	buffer = handle->buffer;
+	ion_buffer_get(buffer);
+	dmabuf = dma_buf_export(buffer, &dma_buf_ops, buffer->size, O_RDWR);
+	if (IS_ERR(dmabuf)) {
+		ion_buffer_put(buffer);
+		return dmabuf;
+	}
+
+	return dmabuf;
+}
+EXPORT_SYMBOL(ion_share_dma_buf);
+
+int ion_share_dma_buf_fd(struct ion_client *client, struct ion_handle *handle)
+{
+	struct dma_buf *dmabuf;
+	int fd;
+
+	dmabuf = ion_share_dma_buf(client, handle);
+	if (IS_ERR(dmabuf))
+		return PTR_ERR(dmabuf);
+
+	fd = dma_buf_fd(dmabuf, O_CLOEXEC);
+	if (fd < 0)
+		dma_buf_put(dmabuf);
+
+	return fd;
+}
+EXPORT_SYMBOL(ion_share_dma_buf_fd);
+
+struct ion_handle *ion_import_dma_buf(struct ion_client *client, int fd)
+{
+	struct dma_buf *dmabuf;
+	struct ion_buffer *buffer;
+	struct ion_handle *handle;
+	int ret;
+
+	dmabuf = dma_buf_get(fd);
+	if (IS_ERR(dmabuf))
+		return ERR_PTR(PTR_ERR(dmabuf));
+	/* if this memory came from ion */
+
+	if (dmabuf->ops != &dma_buf_ops) {
+		pr_err("%s: can not import dmabuf from another exporter\n",
+		       __func__);
+		dma_buf_put(dmabuf);
+		return ERR_PTR(-EINVAL);
+	}
+	buffer = dmabuf->priv;
+
+	mutex_lock(&client->lock);
+	/* if a handle exists for this buffer just take a reference to it */
+	handle = ion_handle_lookup(client, buffer);
+	if (!IS_ERR(handle)) {
+		ion_handle_get(handle);
+		goto end;
+	}
+	handle = ion_handle_create(client, buffer);
+	if (IS_ERR(handle))
+		goto end;
+	ret = ion_handle_add(client, handle);
+	if (ret) {
+		ion_handle_put(handle);
+		handle = ERR_PTR(ret);
+	}
+end:
+	mutex_unlock(&client->lock);
+	dma_buf_put(dmabuf);
+	return handle;
+}
+EXPORT_SYMBOL(ion_import_dma_buf);
+
+static int ion_sync_for_device(struct ion_client *client, int fd)
+{
+	struct dma_buf *dmabuf;
+	struct ion_buffer *buffer;
+
+	dmabuf = dma_buf_get(fd);
+	if (IS_ERR(dmabuf))
+		return PTR_ERR(dmabuf);
+
+	/* if this memory came from ion */
+	if (dmabuf->ops != &dma_buf_ops) {
+		pr_err("%s: can not sync dmabuf from another exporter\n",
+		       __func__);
+		dma_buf_put(dmabuf);
+		return -EINVAL;
+	}
+	buffer = dmabuf->priv;
+
+	dma_sync_sg_for_device(NULL, buffer->sg_table->sgl,
+			       buffer->sg_table->nents, DMA_BIDIRECTIONAL);
+	dma_buf_put(dmabuf);
+	return 0;
+}
+
+static long ion_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
+{
+	struct ion_client *client = filp->private_data;
+
+	switch (cmd) {
+	case ION_IOC_ALLOC:
+	{
+		struct ion_allocation_data data;
+		struct ion_handle *handle;
+
+		if (copy_from_user(&data, (void __user *)arg, sizeof(data)))
+			return -EFAULT;
+		handle = ion_alloc(client, data.len, data.align,
+					     data.heap_id_mask, data.flags);
+
+		if (IS_ERR(handle))
+			return PTR_ERR(handle);
+
+		data.handle = handle->id;
+
+		if (copy_to_user((void __user *)arg, &data, sizeof(data))) {
+			ion_free(client, handle);
+			return -EFAULT;
+		}
+		break;
+	}
+	case ION_IOC_FREE:
+	{
+		struct ion_handle_data data;
+		struct ion_handle *handle;
+
+		if (copy_from_user(&data, (void __user *)arg,
+				   sizeof(struct ion_handle_data)))
+			return -EFAULT;
+		mutex_lock(&client->lock);
+		handle = ion_uhandle_get(client, data.handle);
+		mutex_unlock(&client->lock);
+		if (!handle)
+			return -EINVAL;
+		ion_free(client, handle);
+		break;
+	}
+	case ION_IOC_SHARE:
+	case ION_IOC_MAP:
+	{
+		struct ion_fd_data data;
+		struct ion_handle *handle;
+
+		if (copy_from_user(&data, (void __user *)arg, sizeof(data)))
+			return -EFAULT;
+		handle = ion_uhandle_get(client, data.handle);
+		data.fd = ion_share_dma_buf_fd(client, handle);
+		if (copy_to_user((void __user *)arg, &data, sizeof(data)))
+			return -EFAULT;
+		if (data.fd < 0)
+			return data.fd;
+		break;
+	}
+	case ION_IOC_IMPORT:
+	{
+		struct ion_fd_data data;
+		struct ion_handle *handle;
+		int ret = 0;
+		if (copy_from_user(&data, (void __user *)arg,
+				   sizeof(struct ion_fd_data)))
+			return -EFAULT;
+		handle = ion_import_dma_buf(client, data.fd);
+		if (IS_ERR(handle))
+			ret = PTR_ERR(handle);
+		else
+			data.handle = handle->id;
+
+		if (copy_to_user((void __user *)arg, &data,
+				 sizeof(struct ion_fd_data)))
+			return -EFAULT;
+		if (ret < 0)
+			return ret;
+		break;
+	}
+	case ION_IOC_SYNC:
+	{
+		struct ion_fd_data data;
+		if (copy_from_user(&data, (void __user *)arg,
+				   sizeof(struct ion_fd_data)))
+			return -EFAULT;
+		ion_sync_for_device(client, data.fd);
+		break;
+	}
+	case ION_IOC_CUSTOM:
+	{
+		struct ion_device *dev = client->dev;
+		struct ion_custom_data data;
+
+		if (!dev->custom_ioctl)
+			return -ENOTTY;
+		if (copy_from_user(&data, (void __user *)arg,
+				sizeof(struct ion_custom_data)))
+			return -EFAULT;
+		return dev->custom_ioctl(client, data.cmd, data.arg);
+	}
+	default:
+		return -ENOTTY;
+	}
+	return 0;
+}
+
+static int ion_release(struct inode *inode, struct file *file)
+{
+	struct ion_client *client = file->private_data;
+
+	pr_debug("%s: %d\n", __func__, __LINE__);
+	ion_client_destroy(client);
+	return 0;
+}
+
+static int ion_open(struct inode *inode, struct file *file)
+{
+	struct miscdevice *miscdev = file->private_data;
+	struct ion_device *dev = container_of(miscdev, struct ion_device, dev);
+	struct ion_client *client;
+
+	pr_debug("%s: %d\n", __func__, __LINE__);
+	client = ion_client_create(dev, "user");
+	if (IS_ERR(client))
+		return PTR_ERR(client);
+	file->private_data = client;
+
+	return 0;
+}
+
+static const struct file_operations ion_fops = {
+	.owner          = THIS_MODULE,
+	.open           = ion_open,
+	.release        = ion_release,
+	.unlocked_ioctl = ion_ioctl,
+	.compat_ioctl   = compat_ion_ioctl,
+};
+
+static size_t ion_debug_heap_total(struct ion_client *client,
+				   unsigned int id)
+{
+	size_t size = 0;
+	struct rb_node *n;
+
+	mutex_lock(&client->lock);
+	for (n = rb_first(&client->handles); n; n = rb_next(n)) {
+		struct ion_handle *handle = rb_entry(n,
+						     struct ion_handle,
+						     node);
+		if (handle->buffer->heap->id == id)
+			size += handle->buffer->size;
+	}
+	mutex_unlock(&client->lock);
+	return size;
+}
+
+static int ion_debug_heap_show(struct seq_file *s, void *unused)
+{
+	struct ion_heap *heap = s->private;
+	struct ion_device *dev = heap->dev;
+	struct rb_node *n;
+	size_t total_size = 0;
+	size_t total_orphaned_size = 0;
+
+	seq_printf(s, "%16.s %16.s %16.s\n", "client", "pid", "size");
+	seq_printf(s, "----------------------------------------------------\n");
+
+	for (n = rb_first(&dev->clients); n; n = rb_next(n)) {
+		struct ion_client *client = rb_entry(n, struct ion_client,
+						     node);
+		size_t size = ion_debug_heap_total(client, heap->id);
+		if (!size)
+			continue;
+		if (client->task) {
+			char task_comm[TASK_COMM_LEN];
+
+			get_task_comm(task_comm, client->task);
+			seq_printf(s, "%16.s %16u %16u\n", task_comm,
+				   client->pid, size);
+		} else {
+			seq_printf(s, "%16.s %16u %16u\n", client->name,
+				   client->pid, size);
+		}
+	}
+	seq_printf(s, "----------------------------------------------------\n");
+	seq_printf(s, "orphaned allocations (info is from last known client):"
+		   "\n");
+	mutex_lock(&dev->buffer_lock);
+	for (n = rb_first(&dev->buffers); n; n = rb_next(n)) {
+		struct ion_buffer *buffer = rb_entry(n, struct ion_buffer,
+						     node);
+		if (buffer->heap->id != heap->id)
+			continue;
+		total_size += buffer->size;
+		if (!buffer->handle_count) {
+			seq_printf(s, "%16.s %16u %16u %d %d\n", buffer->task_comm,
+				   buffer->pid, buffer->size, buffer->kmap_cnt,
+				   atomic_read(&buffer->ref.refcount));
+			total_orphaned_size += buffer->size;
+		}
+	}
+	mutex_unlock(&dev->buffer_lock);
+	seq_printf(s, "----------------------------------------------------\n");
+	seq_printf(s, "%16.s %16u\n", "total orphaned",
+		   total_orphaned_size);
+	seq_printf(s, "%16.s %16u\n", "total ", total_size);
+	if (heap->flags & ION_HEAP_FLAG_DEFER_FREE)
+		seq_printf(s, "%16.s %16u\n", "deferred free",
+				heap->free_list_size);
+	seq_printf(s, "----------------------------------------------------\n");
+
+	if (heap->debug_show)
+		heap->debug_show(heap, s, unused);
+
+	return 0;
+}
+
+static int ion_debug_heap_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, ion_debug_heap_show, inode->i_private);
+}
+
+static const struct file_operations debug_heap_fops = {
+	.open = ion_debug_heap_open,
+	.read = seq_read,
+	.llseek = seq_lseek,
+	.release = single_release,
+};
+
+#ifdef DEBUG_HEAP_SHRINKER
+static int debug_shrink_set(void *data, u64 val)
+{
+        struct ion_heap *heap = data;
+        struct shrink_control sc;
+        int objs;
+
+        sc.gfp_mask = -1;
+        sc.nr_to_scan = 0;
+
+        if (!val)
+                return 0;
+
+        objs = heap->shrinker.shrink(&heap->shrinker, &sc);
+        sc.nr_to_scan = objs;
+
+        heap->shrinker.shrink(&heap->shrinker, &sc);
+        return 0;
+}
+
+static int debug_shrink_get(void *data, u64 *val)
+{
+        struct ion_heap *heap = data;
+        struct shrink_control sc;
+        int objs;
+
+        sc.gfp_mask = -1;
+        sc.nr_to_scan = 0;
+
+        objs = heap->shrinker.shrink(&heap->shrinker, &sc);
+        *val = objs;
+        return 0;
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(debug_shrink_fops, debug_shrink_get,
+                        debug_shrink_set, "%llu\n");
+#endif
+
+void ion_device_add_heap(struct ion_device *dev, struct ion_heap *heap)
+{
+	if (!heap->ops->allocate || !heap->ops->free || !heap->ops->map_dma ||
+	    !heap->ops->unmap_dma)
+		pr_err("%s: can not add heap with invalid ops struct.\n",
+		       __func__);
+
+	if (heap->flags & ION_HEAP_FLAG_DEFER_FREE)
+		ion_heap_init_deferred_free(heap);
+
+	heap->dev = dev;
+	down_write(&dev->lock);
+	/* use negative heap->id to reverse the priority -- when traversing
+	   the list later attempt higher id numbers first */
+	plist_node_init(&heap->node, -heap->id);
+	plist_add(&heap->node, &dev->heaps);
+	debugfs_create_file(heap->name, 0664, dev->debug_root, heap,
+			    &debug_heap_fops);
+#ifdef DEBUG_HEAP_SHRINKER
+	if (heap->shrinker.shrink) {
+		char debug_name[64];
+
+		snprintf(debug_name, 64, "%s_shrink", heap->name);
+		debugfs_create_file(debug_name, 0644, dev->debug_root, heap,
+				    &debug_shrink_fops);
+	}
+#endif
+	up_write(&dev->lock);
+}
+
+struct ion_device *ion_device_create(long (*custom_ioctl)
+				     (struct ion_client *client,
+				      unsigned int cmd,
+				      unsigned long arg))
+{
+	struct ion_device *idev;
+	int ret;
+
+	idev = kzalloc(sizeof(struct ion_device), GFP_KERNEL);
+	if (!idev)
+		return ERR_PTR(-ENOMEM);
+
+	idev->dev.minor = MISC_DYNAMIC_MINOR;
+	idev->dev.name = "ion";
+	idev->dev.fops = &ion_fops;
+	idev->dev.parent = NULL;
+	ret = misc_register(&idev->dev);
+	if (ret) {
+		pr_err("ion: failed to register misc device.\n");
+		return ERR_PTR(ret);
+	}
+
+	idev->debug_root = debugfs_create_dir("ion", NULL);
+	if (!idev->debug_root)
+		pr_err("ion: failed to create debug files.\n");
+
+	idev->custom_ioctl = custom_ioctl;
+	idev->buffers = RB_ROOT;
+	mutex_init(&idev->buffer_lock);
+	init_rwsem(&idev->lock);
+	plist_head_init(&idev->heaps);
+	idev->clients = RB_ROOT;
+	return idev;
+}
+
+void ion_device_destroy(struct ion_device *dev)
+{
+	misc_deregister(&dev->dev);
+	/* XXX need to free the heaps and clients ? */
+	kfree(dev);
+}
+
+void __init ion_reserve(struct ion_platform_data *data)
+{
+	int i;
+
+	for (i = 0; i < data->nr; i++) {
+		if (data->heaps[i].size == 0)
+			continue;
+
+		if (data->heaps[i].base == 0) {
+			phys_addr_t paddr;
+			paddr = memblock_alloc_base(data->heaps[i].size,
+						    data->heaps[i].align,
+						    MEMBLOCK_ALLOC_ANYWHERE);
+			if (!paddr) {
+				pr_err("%s: error allocating memblock for "
+				       "heap %d\n",
+					__func__, i);
+				continue;
+			}
+			data->heaps[i].base = paddr;
+		} else {
+			int ret = memblock_reserve(data->heaps[i].base,
+					       data->heaps[i].size);
+			if (ret)
+				pr_err("memblock reserve of %x@%lx failed\n",
+				       data->heaps[i].size,
+				       data->heaps[i].base);
+		}
+		pr_info("%s: %s reserved base %lx size %d\n", __func__,
+			data->heaps[i].name,
+			data->heaps[i].base,
+			data->heaps[i].size);
+	}
+}
diff --git a/drivers/staging/android/ion/ion.h b/drivers/staging/android/ion/ion.h
new file mode 100644
index 00000000000..6b4d9fbeaec
--- /dev/null
+++ b/drivers/staging/android/ion/ion.h
@@ -0,0 +1,378 @@
+/*
+ * drivers/staging/android/ion/ion.h
+ *
+ * Copyright (C) 2011 Google, Inc.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ *
+ */
+
+#ifndef _LINUX_ION_H
+#define _LINUX_ION_H
+
+#include <linux/types.h>
+
+typedef int ion_user_handle_t;
+
+/**
+ * enum ion_heap_types - list of all possible types of heaps
+ * @ION_HEAP_TYPE_SYSTEM:	 memory allocated via vmalloc
+ * @ION_HEAP_TYPE_SYSTEM_CONTIG: memory allocated via kmalloc
+ * @ION_HEAP_TYPE_CARVEOUT:	 memory allocated from a prereserved
+ * 				 carveout heap, allocations are physically
+ * 				 contiguous
+ * @ION_HEAP_TYPE_DMA:		 memory allocated via DMA API
+ * @ION_NUM_HEAPS:		 helper for iterating over heaps, a bit mask
+ * 				 is used to identify the heaps, so only 32
+ * 				 total heap types are supported
+ */
+enum ion_heap_type {
+	ION_HEAP_TYPE_SYSTEM,
+	ION_HEAP_TYPE_SYSTEM_CONTIG,
+	ION_HEAP_TYPE_CARVEOUT,
+	ION_HEAP_TYPE_CHUNK,
+	ION_HEAP_TYPE_DMA,
+	ION_HEAP_TYPE_CUSTOM, /* must be last so device specific heaps always
+				 are at the end of this enum */
+	ION_NUM_HEAPS = 16,
+};
+
+#define ION_HEAP_SYSTEM_MASK		(1 << ION_HEAP_TYPE_SYSTEM)
+#define ION_HEAP_SYSTEM_CONTIG_MASK	(1 << ION_HEAP_TYPE_SYSTEM_CONTIG)
+#define ION_HEAP_CARVEOUT_MASK		(1 << ION_HEAP_TYPE_CARVEOUT)
+#define ION_HEAP_TYPE_DMA_MASK		(1 << ION_HEAP_TYPE_DMA)
+
+#define ION_NUM_HEAP_IDS		sizeof(unsigned int) * 8
+
+/**
+ * allocation flags - the lower 16 bits are used by core ion, the upper 16
+ * bits are reserved for use by the heaps themselves.
+ */
+#define ION_FLAG_CACHED 1		/* mappings of this buffer should be
+					   cached, ion will do cache
+					   maintenance when the buffer is
+					   mapped for dma */
+#define ION_FLAG_CACHED_NEEDS_SYNC 2	/* mappings of this buffer will created
+					   at mmap time, if this is set
+					   caches must be managed manually */
+
+#ifdef __KERNEL__
+struct ion_handle;
+struct ion_device;
+struct ion_heap;
+struct ion_mapper;
+struct ion_client;
+struct ion_buffer;
+
+/* This should be removed some day when phys_addr_t's are fully
+   plumbed in the kernel, and all instances of ion_phys_addr_t should
+   be converted to phys_addr_t.  For the time being many kernel interfaces
+   do not accept phys_addr_t's that would have to */
+#define ion_phys_addr_t unsigned long
+
+/**
+ * struct ion_platform_heap - defines a heap in the given platform
+ * @type:	type of the heap from ion_heap_type enum
+ * @id:		unique identifier for heap.  When allocating higher numbers
+ * 		will be allocated from first.  At allocation these are passed
+ *		as a bit mask and therefore can not exceed ION_NUM_HEAP_IDS.
+ * @name:	used for debug purposes
+ * @base:	base address of heap in physical memory if applicable
+ * @size:	size of the heap in bytes if applicable
+ * @align:	required alignment in physical memory if applicable
+ * @priv:	private info passed from the board file
+ *
+ * Provided by the board file.
+ */
+struct ion_platform_heap {
+	enum ion_heap_type type;
+	unsigned int id;
+	const char *name;
+	ion_phys_addr_t base;
+	size_t size;
+	ion_phys_addr_t align;
+	void *priv;
+};
+
+/**
+ * struct ion_platform_data - array of platform heaps passed from board file
+ * @nr:		number of structures in the array
+ * @heaps:	array of platform_heap structions
+ *
+ * Provided by the board file in the form of platform data to a platform device.
+ */
+struct ion_platform_data {
+	int nr;
+	struct ion_platform_heap *heaps;
+};
+
+/**
+ * ion_reserve() - reserve memory for ion heaps if applicable
+ * @data:	platform data specifying starting physical address and
+ *		size
+ *
+ * Calls memblock reserve to set aside memory for heaps that are
+ * located at specific memory addresses or of specfic sizes not
+ * managed by the kernel
+ */
+void ion_reserve(struct ion_platform_data *data);
+
+/**
+ * ion_client_create() -  allocate a client and returns it
+ * @dev:		the global ion device
+ * @heap_type_mask:	mask of heaps this client can allocate from
+ * @name:		used for debugging
+ */
+struct ion_client *ion_client_create(struct ion_device *dev,
+				     const char *name);
+
+/**
+ * ion_client_destroy() -  free's a client and all it's handles
+ * @client:	the client
+ *
+ * Free the provided client and all it's resources including
+ * any handles it is holding.
+ */
+void ion_client_destroy(struct ion_client *client);
+
+/**
+ * ion_alloc - allocate ion memory
+ * @client:		the client
+ * @len:		size of the allocation
+ * @align:		requested allocation alignment, lots of hardware blocks
+ *			have alignment requirements of some kind
+ * @heap_id_mask:	mask of heaps to allocate from, if multiple bits are set
+ *			heaps will be tried in order from highest to lowest
+ *			id
+ * @flags:		heap flags, the low 16 bits are consumed by ion, the
+ *			high 16 bits are passed on to the respective heap and
+ *			can be heap custom
+ *
+ * Allocate memory in one of the heaps provided in heap mask and return
+ * an opaque handle to it.
+ */
+struct ion_handle *ion_alloc(struct ion_client *client, size_t len,
+			     size_t align, unsigned int heap_id_mask,
+			     unsigned int flags);
+
+/**
+ * ion_free - free a handle
+ * @client:	the client
+ * @handle:	the handle to free
+ *
+ * Free the provided handle.
+ */
+void ion_free(struct ion_client *client, struct ion_handle *handle);
+
+/**
+ * ion_phys - returns the physical address and len of a handle
+ * @client:	the client
+ * @handle:	the handle
+ * @addr:	a pointer to put the address in
+ * @len:	a pointer to put the length in
+ *
+ * This function queries the heap for a particular handle to get the
+ * handle's physical address.  It't output is only correct if
+ * a heap returns physically contiguous memory -- in other cases
+ * this api should not be implemented -- ion_sg_table should be used
+ * instead.  Returns -EINVAL if the handle is invalid.  This has
+ * no implications on the reference counting of the handle --
+ * the returned value may not be valid if the caller is not
+ * holding a reference.
+ */
+int ion_phys(struct ion_client *client, struct ion_handle *handle,
+	     ion_phys_addr_t *addr, size_t *len);
+
+/**
+ * ion_map_dma - return an sg_table describing a handle
+ * @client:	the client
+ * @handle:	the handle
+ *
+ * This function returns the sg_table describing
+ * a particular ion handle.
+ */
+struct sg_table *ion_sg_table(struct ion_client *client,
+			      struct ion_handle *handle);
+
+/**
+ * ion_map_kernel - create mapping for the given handle
+ * @client:	the client
+ * @handle:	handle to map
+ *
+ * Map the given handle into the kernel and return a kernel address that
+ * can be used to access this address.
+ */
+void *ion_map_kernel(struct ion_client *client, struct ion_handle *handle);
+
+/**
+ * ion_unmap_kernel() - destroy a kernel mapping for a handle
+ * @client:	the client
+ * @handle:	handle to unmap
+ */
+void ion_unmap_kernel(struct ion_client *client, struct ion_handle *handle);
+
+/**
+ * ion_share_dma_buf() - share buffer as dma-buf
+ * @client:	the client
+ * @handle:	the handle
+ */
+struct dma_buf *ion_share_dma_buf(struct ion_client *client,
+						struct ion_handle *handle);
+
+/**
+ * ion_share_dma_buf_fd() - given an ion client, create a dma-buf fd
+ * @client:	the client
+ * @handle:	the handle
+ */
+int ion_share_dma_buf_fd(struct ion_client *client, struct ion_handle *handle);
+
+/**
+ * ion_import_dma_buf() - given an dma-buf fd from the ion exporter get handle
+ * @client:	the client
+ * @fd:		the dma-buf fd
+ *
+ * Given an dma-buf fd that was allocated through ion via ion_share_dma_buf,
+ * import that fd and return a handle representing it.  If a dma-buf from
+ * another exporter is passed in this function will return ERR_PTR(-EINVAL)
+ */
+struct ion_handle *ion_import_dma_buf(struct ion_client *client, int fd);
+
+#endif /* __KERNEL__ */
+
+/**
+ * DOC: Ion Userspace API
+ *
+ * create a client by opening /dev/ion
+ * most operations handled via following ioctls
+ *
+ */
+
+/**
+ * struct ion_allocation_data - metadata passed from userspace for allocations
+ * @len:		size of the allocation
+ * @align:		required alignment of the allocation
+ * @heap_id_mask:	mask of heap ids to allocate from
+ * @flags:		flags passed to heap
+ * @handle:		pointer that will be populated with a cookie to use to 
+ *			refer to this allocation
+ *
+ * Provided by userspace as an argument to the ioctl
+ */
+struct ion_allocation_data {
+	size_t len;
+	size_t align;
+	unsigned int heap_id_mask;
+	unsigned int flags;
+	ion_user_handle_t handle;
+};
+
+/**
+ * struct ion_fd_data - metadata passed to/from userspace for a handle/fd pair
+ * @handle:	a handle
+ * @fd:		a file descriptor representing that handle
+ *
+ * For ION_IOC_SHARE or ION_IOC_MAP userspace populates the handle field with
+ * the handle returned from ion alloc, and the kernel returns the file
+ * descriptor to share or map in the fd field.  For ION_IOC_IMPORT, userspace
+ * provides the file descriptor and the kernel returns the handle.
+ */
+struct ion_fd_data {
+	ion_user_handle_t handle;
+	int fd;
+};
+
+/**
+ * struct ion_handle_data - a handle passed to/from the kernel
+ * @handle:	a handle
+ */
+struct ion_handle_data {
+	ion_user_handle_t handle;
+};
+
+/**
+ * struct ion_custom_data - metadata passed to/from userspace for a custom ioctl
+ * @cmd:	the custom ioctl function to call
+ * @arg:	additional data to pass to the custom ioctl, typically a user
+ *		pointer to a predefined structure
+ *
+ * This works just like the regular cmd and arg fields of an ioctl.
+ */
+struct ion_custom_data {
+	unsigned int cmd;
+	unsigned long arg;
+};
+
+#define ION_IOC_MAGIC		'I'
+
+/**
+ * DOC: ION_IOC_ALLOC - allocate memory
+ *
+ * Takes an ion_allocation_data struct and returns it with the handle field
+ * populated with the opaque handle for the allocation.
+ */
+#define ION_IOC_ALLOC		_IOWR(ION_IOC_MAGIC, 0, \
+				      struct ion_allocation_data)
+
+/**
+ * DOC: ION_IOC_FREE - free memory
+ *
+ * Takes an ion_handle_data struct and frees the handle.
+ */
+#define ION_IOC_FREE		_IOWR(ION_IOC_MAGIC, 1, struct ion_handle_data)
+
+/**
+ * DOC: ION_IOC_MAP - get a file descriptor to mmap
+ *
+ * Takes an ion_fd_data struct with the handle field populated with a valid
+ * opaque handle.  Returns the struct with the fd field set to a file
+ * descriptor open in the current address space.  This file descriptor
+ * can then be used as an argument to mmap.
+ */
+#define ION_IOC_MAP		_IOWR(ION_IOC_MAGIC, 2, struct ion_fd_data)
+
+/**
+ * DOC: ION_IOC_SHARE - creates a file descriptor to use to share an allocation
+ *
+ * Takes an ion_fd_data struct with the handle field populated with a valid
+ * opaque handle.  Returns the struct with the fd field set to a file
+ * descriptor open in the current address space.  This file descriptor
+ * can then be passed to another process.  The corresponding opaque handle can
+ * be retrieved via ION_IOC_IMPORT.
+ */
+#define ION_IOC_SHARE		_IOWR(ION_IOC_MAGIC, 4, struct ion_fd_data)
+
+/**
+ * DOC: ION_IOC_IMPORT - imports a shared file descriptor
+ *
+ * Takes an ion_fd_data struct with the fd field populated with a valid file
+ * descriptor obtained from ION_IOC_SHARE and returns the struct with the handle
+ * filed set to the corresponding opaque handle.
+ */
+#define ION_IOC_IMPORT		_IOWR(ION_IOC_MAGIC, 5, struct ion_fd_data)
+
+/**
+ * DOC: ION_IOC_SYNC - syncs a shared file descriptors to memory
+ *
+ * Deprecated in favor of using the dma_buf api's correctly (syncing
+ * will happend automatically when the buffer is mapped to a device).
+ * If necessary should be used after touching a cached buffer from the cpu,
+ * this will make the buffer in memory coherent.
+ */
+#define ION_IOC_SYNC		_IOWR(ION_IOC_MAGIC, 7, struct ion_fd_data)
+
+/**
+ * DOC: ION_IOC_CUSTOM - call architecture specific ion ioctl
+ *
+ * Takes the argument of the architecture specific ioctl to call and
+ * passes appropriate userdata for that ioctl
+ */
+#define ION_IOC_CUSTOM		_IOWR(ION_IOC_MAGIC, 6, struct ion_custom_data)
+
+#endif /* _LINUX_ION_H */
diff --git a/drivers/staging/android/ion/ion_carveout_heap.c b/drivers/staging/android/ion/ion_carveout_heap.c
new file mode 100644
index 00000000000..4a94b17da67
--- /dev/null
+++ b/drivers/staging/android/ion/ion_carveout_heap.c
@@ -0,0 +1,187 @@
+/*
+ * drivers/gpu/ion/ion_carveout_heap.c
+ *
+ * Copyright (C) 2011 Google, Inc.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ *
+ */
+#include <linux/spinlock.h>
+
+#include <linux/err.h>
+#include <linux/genalloc.h>
+#include <linux/io.h>
+#include <linux/mm.h>
+#include <linux/scatterlist.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include "ion.h"
+#include "ion_priv.h"
+
+#include <asm/mach/map.h>
+
+struct ion_carveout_heap {
+	struct ion_heap heap;
+	struct gen_pool *pool;
+	ion_phys_addr_t base;
+};
+
+ion_phys_addr_t ion_carveout_allocate(struct ion_heap *heap,
+				      unsigned long size,
+				      unsigned long align)
+{
+	struct ion_carveout_heap *carveout_heap =
+		container_of(heap, struct ion_carveout_heap, heap);
+	unsigned long offset = gen_pool_alloc(carveout_heap->pool, size);
+
+	if (!offset)
+		return ION_CARVEOUT_ALLOCATE_FAIL;
+
+	return offset;
+}
+
+void ion_carveout_free(struct ion_heap *heap, ion_phys_addr_t addr,
+		       unsigned long size)
+{
+	struct ion_carveout_heap *carveout_heap =
+		container_of(heap, struct ion_carveout_heap, heap);
+
+	if (addr == ION_CARVEOUT_ALLOCATE_FAIL)
+		return;
+	gen_pool_free(carveout_heap->pool, addr, size);
+}
+
+static int ion_carveout_heap_phys(struct ion_heap *heap,
+				  struct ion_buffer *buffer,
+				  ion_phys_addr_t *addr, size_t *len)
+{
+	*addr = buffer->priv_phys;
+	*len = buffer->size;
+	return 0;
+}
+
+static int ion_carveout_heap_allocate(struct ion_heap *heap,
+				      struct ion_buffer *buffer,
+				      unsigned long size, unsigned long align,
+				      unsigned long flags)
+{
+	buffer->priv_phys = ion_carveout_allocate(heap, size, align);
+	return buffer->priv_phys == ION_CARVEOUT_ALLOCATE_FAIL ? -ENOMEM : 0;
+}
+
+static void ion_carveout_heap_free(struct ion_buffer *buffer)
+{
+	struct ion_heap *heap = buffer->heap;
+
+	ion_carveout_free(heap, buffer->priv_phys, buffer->size);
+	buffer->priv_phys = ION_CARVEOUT_ALLOCATE_FAIL;
+}
+
+struct sg_table *ion_carveout_heap_map_dma(struct ion_heap *heap,
+					      struct ion_buffer *buffer)
+{
+	struct sg_table *table;
+	int ret;
+
+	table = kzalloc(sizeof(struct sg_table), GFP_KERNEL);
+	if (!table)
+		return ERR_PTR(-ENOMEM);
+	ret = sg_alloc_table(table, 1, GFP_KERNEL);
+	if (ret) {
+		kfree(table);
+		return ERR_PTR(ret);
+	}
+	sg_set_page(table->sgl, phys_to_page(buffer->priv_phys), buffer->size,
+		    0);
+	return table;
+}
+
+void ion_carveout_heap_unmap_dma(struct ion_heap *heap,
+				 struct ion_buffer *buffer)
+{
+	sg_free_table(buffer->sg_table);
+}
+
+void *ion_carveout_heap_map_kernel(struct ion_heap *heap,
+				   struct ion_buffer *buffer)
+{
+	void *ret;
+	int mtype = MT_MEMORY_NONCACHED;
+
+	if (buffer->flags & ION_FLAG_CACHED)
+		mtype = MT_MEMORY;
+
+	ret = __arm_ioremap(buffer->priv_phys, buffer->size,
+			      mtype);
+	if (ret == NULL)
+		return ERR_PTR(-ENOMEM);
+
+	return ret;
+}
+
+void ion_carveout_heap_unmap_kernel(struct ion_heap *heap,
+				    struct ion_buffer *buffer)
+{
+	__arm_iounmap(buffer->vaddr);
+	buffer->vaddr = NULL;
+	return;
+}
+
+int ion_carveout_heap_map_user(struct ion_heap *heap, struct ion_buffer *buffer,
+			       struct vm_area_struct *vma)
+{
+	return remap_pfn_range(vma, vma->vm_start,
+			       __phys_to_pfn(buffer->priv_phys) + vma->vm_pgoff,
+			       vma->vm_end - vma->vm_start,
+			       pgprot_noncached(vma->vm_page_prot));
+}
+
+static struct ion_heap_ops carveout_heap_ops = {
+	.allocate = ion_carveout_heap_allocate,
+	.free = ion_carveout_heap_free,
+	.phys = ion_carveout_heap_phys,
+	.map_dma = ion_carveout_heap_map_dma,
+	.unmap_dma = ion_carveout_heap_unmap_dma,
+	.map_user = ion_carveout_heap_map_user,
+	.map_kernel = ion_carveout_heap_map_kernel,
+	.unmap_kernel = ion_carveout_heap_unmap_kernel,
+};
+
+struct ion_heap *ion_carveout_heap_create(struct ion_platform_heap *heap_data)
+{
+	struct ion_carveout_heap *carveout_heap;
+
+	carveout_heap = kzalloc(sizeof(struct ion_carveout_heap), GFP_KERNEL);
+	if (!carveout_heap)
+		return ERR_PTR(-ENOMEM);
+
+	carveout_heap->pool = gen_pool_create(12, -1);
+	if (!carveout_heap->pool) {
+		kfree(carveout_heap);
+		return ERR_PTR(-ENOMEM);
+	}
+	carveout_heap->base = heap_data->base;
+	gen_pool_add(carveout_heap->pool, carveout_heap->base, heap_data->size,
+		     -1);
+	carveout_heap->heap.ops = &carveout_heap_ops;
+	carveout_heap->heap.type = ION_HEAP_TYPE_CARVEOUT;
+
+	return &carveout_heap->heap;
+}
+
+void ion_carveout_heap_destroy(struct ion_heap *heap)
+{
+	struct ion_carveout_heap *carveout_heap =
+	     container_of(heap, struct  ion_carveout_heap, heap);
+
+	gen_pool_destroy(carveout_heap->pool);
+	kfree(carveout_heap);
+	carveout_heap = NULL;
+}
diff --git a/drivers/staging/android/ion/ion_chunk_heap.c b/drivers/staging/android/ion/ion_chunk_heap.c
new file mode 100644
index 00000000000..a2b2e1b7af3
--- /dev/null
+++ b/drivers/staging/android/ion/ion_chunk_heap.c
@@ -0,0 +1,213 @@
+/*
+ * drivers/gpu/ion/ion_chunk_heap.c
+ *
+ * Copyright (C) 2012 Google, Inc.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ *
+ */
+//#include <linux/spinlock.h>
+#include <linux/dma-mapping.h>
+#include <linux/err.h>
+#include <linux/genalloc.h>
+#include <linux/io.h>
+#include <linux/mm.h>
+#include <linux/scatterlist.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include "ion.h"
+#include "ion_priv.h"
+
+#include <asm/mach/map.h>
+
+struct ion_chunk_heap {
+	struct ion_heap heap;
+	struct gen_pool *pool;
+	ion_phys_addr_t base;
+	unsigned long chunk_size;
+	unsigned long size;
+	unsigned long allocated;
+};
+
+static int ion_chunk_heap_allocate(struct ion_heap *heap,
+				      struct ion_buffer *buffer,
+				      unsigned long size, unsigned long align,
+				      unsigned long flags)
+{
+	struct ion_chunk_heap *chunk_heap =
+		container_of(heap, struct ion_chunk_heap, heap);
+	struct sg_table *table;
+	struct scatterlist *sg;
+	int ret, i;
+	unsigned long num_chunks;
+	unsigned long allocated_size;
+
+	if (ion_buffer_fault_user_mappings(buffer))
+		return -ENOMEM;
+
+	allocated_size = ALIGN(size, chunk_heap->chunk_size);
+	num_chunks = allocated_size / chunk_heap->chunk_size;
+
+	if (allocated_size > chunk_heap->size - chunk_heap->allocated)
+		return -ENOMEM;
+
+	table = kzalloc(sizeof(struct sg_table), GFP_KERNEL);
+	if (!table)
+		return -ENOMEM;
+	ret = sg_alloc_table(table, num_chunks, GFP_KERNEL);
+	if (ret) {
+		kfree(table);
+		return ret;
+	}
+
+	sg = table->sgl;
+	for (i = 0; i < num_chunks; i++) {
+		unsigned long paddr = gen_pool_alloc(chunk_heap->pool,
+						     chunk_heap->chunk_size);
+		if (!paddr)
+			goto err;
+		sg_set_page(sg, phys_to_page(paddr), chunk_heap->chunk_size, 0);
+		sg = sg_next(sg);
+	}
+
+	buffer->priv_virt = table;
+	chunk_heap->allocated += allocated_size;
+	return 0;
+err:
+	sg = table->sgl;
+	for (i -= 1; i >= 0; i--) {
+		gen_pool_free(chunk_heap->pool, page_to_phys(sg_page(sg)),
+			      sg_dma_len(sg));
+		sg = sg_next(sg);
+	}
+	sg_free_table(table);
+	kfree(table);
+	return -ENOMEM;
+}
+
+static void ion_chunk_heap_free(struct ion_buffer *buffer)
+{
+	struct ion_heap *heap = buffer->heap;
+	struct ion_chunk_heap *chunk_heap =
+		container_of(heap, struct ion_chunk_heap, heap);
+	struct sg_table *table = buffer->priv_virt;
+	struct scatterlist *sg;
+	int i;
+	unsigned long allocated_size;
+
+	allocated_size = ALIGN(buffer->size, chunk_heap->chunk_size);
+
+	ion_heap_buffer_zero(buffer);
+
+	for_each_sg(table->sgl, sg, table->nents, i) {
+		if (ion_buffer_cached(buffer))
+			arm_dma_ops.sync_single_for_device(NULL,
+				pfn_to_dma(NULL, page_to_pfn(sg_page(sg))),
+				sg_dma_len(sg), DMA_BIDIRECTIONAL);
+		gen_pool_free(chunk_heap->pool, page_to_phys(sg_page(sg)),
+			      sg_dma_len(sg));
+	}
+	chunk_heap->allocated -= allocated_size;
+	sg_free_table(table);
+	kfree(table);
+}
+
+struct sg_table *ion_chunk_heap_map_dma(struct ion_heap *heap,
+					 struct ion_buffer *buffer)
+{
+	return buffer->priv_virt;
+}
+
+void ion_chunk_heap_unmap_dma(struct ion_heap *heap,
+			       struct ion_buffer *buffer)
+{
+	return;
+}
+
+static struct ion_heap_ops chunk_heap_ops = {
+	.allocate = ion_chunk_heap_allocate,
+	.free = ion_chunk_heap_free,
+	.map_dma = ion_chunk_heap_map_dma,
+	.unmap_dma = ion_chunk_heap_unmap_dma,
+	.map_user = ion_heap_map_user,
+	.map_kernel = ion_heap_map_kernel,
+	.unmap_kernel = ion_heap_unmap_kernel,
+};
+
+struct ion_heap *ion_chunk_heap_create(struct ion_platform_heap *heap_data)
+{
+	struct ion_chunk_heap *chunk_heap;
+	struct vm_struct *vm_struct;
+	pgprot_t pgprot = pgprot_writecombine(PAGE_KERNEL);
+	int i, ret;
+
+
+	chunk_heap = kzalloc(sizeof(struct ion_chunk_heap), GFP_KERNEL);
+	if (!chunk_heap)
+		return ERR_PTR(-ENOMEM);
+
+	chunk_heap->chunk_size = (unsigned long)heap_data->priv;
+	chunk_heap->pool = gen_pool_create(get_order(chunk_heap->chunk_size) +
+					   PAGE_SHIFT, -1);
+	if (!chunk_heap->pool) {
+		ret = -ENOMEM;
+		goto error_gen_pool_create;
+	}
+	chunk_heap->base = heap_data->base;
+	chunk_heap->size = heap_data->size;
+	chunk_heap->allocated = 0;
+
+	vm_struct = get_vm_area(PAGE_SIZE, VM_ALLOC);
+	if (!vm_struct) {
+		ret = -ENOMEM;
+		goto error;
+	}
+	for (i = 0; i < chunk_heap->size; i += PAGE_SIZE) {
+		struct page *page = phys_to_page(chunk_heap->base + i);
+		struct page **pages = &page;
+
+		ret = map_vm_area(vm_struct, pgprot, &pages);
+		if (ret)
+			goto error_map_vm_area;
+		memset(vm_struct->addr, 0, PAGE_SIZE);
+		unmap_kernel_range((unsigned long)vm_struct->addr, PAGE_SIZE);
+	}
+	free_vm_area(vm_struct);
+
+	arm_dma_ops.sync_single_for_device(NULL,
+		pfn_to_dma(NULL, page_to_pfn(phys_to_page(heap_data->base))),
+		heap_data->size, DMA_BIDIRECTIONAL);
+	gen_pool_add(chunk_heap->pool, chunk_heap->base, heap_data->size, -1);
+	chunk_heap->heap.ops = &chunk_heap_ops;
+	chunk_heap->heap.type = ION_HEAP_TYPE_CHUNK;
+	chunk_heap->heap.flags = ION_HEAP_FLAG_DEFER_FREE;
+	pr_info("%s: base %lu size %u align %ld\n", __func__, chunk_heap->base,
+		heap_data->size, heap_data->align);
+
+	return &chunk_heap->heap;
+
+error_map_vm_area:
+	free_vm_area(vm_struct);
+error:
+	gen_pool_destroy(chunk_heap->pool);
+error_gen_pool_create:
+	kfree(chunk_heap);
+	return ERR_PTR(ret);
+}
+
+void ion_chunk_heap_destroy(struct ion_heap *heap)
+{
+	struct ion_chunk_heap *chunk_heap =
+	     container_of(heap, struct  ion_chunk_heap, heap);
+
+	gen_pool_destroy(chunk_heap->pool);
+	kfree(chunk_heap);
+	chunk_heap = NULL;
+}
diff --git a/drivers/staging/android/ion/ion_cma_heap.c b/drivers/staging/android/ion/ion_cma_heap.c
new file mode 100644
index 00000000000..55d6003f546
--- /dev/null
+++ b/drivers/staging/android/ion/ion_cma_heap.c
@@ -0,0 +1,204 @@
+/*
+ * drivers/gpu/ion/ion_cma_heap.c
+ *
+ * Copyright (C) Linaro 2012
+ * Author: <benjamin.gaignard@linaro.org> for ST-Ericsson.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ *
+ */
+
+#include <linux/device.h>
+#include <linux/slab.h>
+#include <linux/errno.h>
+#include <linux/err.h>
+#include <linux/dma-mapping.h>
+
+#include "ion.h"
+#include "ion_priv.h"
+
+#define ION_CMA_ALLOCATE_FAILED -1
+
+struct ion_cma_heap {
+	struct ion_heap heap;
+	struct device *dev;
+};
+
+#define to_cma_heap(x) container_of(x, struct ion_cma_heap, heap)
+
+struct ion_cma_buffer_info {
+	void *cpu_addr;
+	dma_addr_t handle;
+	struct sg_table *table;
+};
+
+/*
+ * Create scatter-list for the already allocated DMA buffer.
+ * This function could be replaced by dma_common_get_sgtable
+ * as soon as it will avalaible.
+ */
+int ion_cma_get_sgtable(struct device *dev, struct sg_table *sgt,
+			void *cpu_addr, dma_addr_t handle, size_t size)
+{
+	struct page *page = virt_to_page(cpu_addr);
+	int ret;
+
+	ret = sg_alloc_table(sgt, 1, GFP_KERNEL);
+	if (unlikely(ret))
+		return ret;
+
+	sg_set_page(sgt->sgl, page, PAGE_ALIGN(size), 0);
+	return 0;
+}
+
+/* ION CMA heap operations functions */
+static int ion_cma_allocate(struct ion_heap *heap, struct ion_buffer *buffer,
+			    unsigned long len, unsigned long align,
+			    unsigned long flags)
+{
+	struct ion_cma_heap *cma_heap = to_cma_heap(heap);
+	struct device *dev = cma_heap->dev;
+	struct ion_cma_buffer_info *info;
+
+	dev_dbg(dev, "Request buffer allocation len %ld\n", len);
+
+	info = kzalloc(sizeof(struct ion_cma_buffer_info), GFP_KERNEL);
+	if (!info) {
+		dev_err(dev, "Can't allocate buffer info\n");
+		return ION_CMA_ALLOCATE_FAILED;
+	}
+
+	info->cpu_addr = dma_alloc_coherent(dev, len, &(info->handle), 0);
+
+	if (!info->cpu_addr) {
+		dev_err(dev, "Fail to allocate buffer\n");
+		goto err;
+	}
+
+	info->table = kmalloc(sizeof(struct sg_table), GFP_KERNEL);
+	if (!info->table) {
+		dev_err(dev, "Fail to allocate sg table\n");
+		goto free_mem;
+	}
+
+	if (ion_cma_get_sgtable
+	    (dev, info->table, info->cpu_addr, info->handle, len))
+		goto free_table;
+	/* keep this for memory release */
+	buffer->priv_virt = info;
+	dev_dbg(dev, "Allocate buffer %p\n", buffer);
+	return 0;
+
+free_table:
+	kfree(info->table);
+free_mem:
+	dma_free_coherent(dev, len, info->cpu_addr, info->handle);
+err:
+	kfree(info);
+	return ION_CMA_ALLOCATE_FAILED;
+}
+
+static void ion_cma_free(struct ion_buffer *buffer)
+{
+	struct ion_cma_heap *cma_heap = to_cma_heap(buffer->heap);
+	struct device *dev = cma_heap->dev;
+	struct ion_cma_buffer_info *info = buffer->priv_virt;
+
+	dev_dbg(dev, "Release buffer %p\n", buffer);
+	/* release memory */
+	dma_free_coherent(dev, buffer->size, info->cpu_addr, info->handle);
+	/* release sg table */
+	sg_free_table(info->table);
+	kfree(info->table);
+	kfree(info);
+}
+
+/* return physical address in addr */
+static int ion_cma_phys(struct ion_heap *heap, struct ion_buffer *buffer,
+			ion_phys_addr_t *addr, size_t *len)
+{
+	struct ion_cma_heap *cma_heap = to_cma_heap(buffer->heap);
+	struct device *dev = cma_heap->dev;
+	struct ion_cma_buffer_info *info = buffer->priv_virt;
+
+	dev_dbg(dev, "Return buffer %p physical address 0x%x\n", buffer,
+		info->handle);
+
+	*addr = info->handle;
+	*len = buffer->size;
+
+	return 0;
+}
+
+struct sg_table *ion_cma_heap_map_dma(struct ion_heap *heap,
+					 struct ion_buffer *buffer)
+{
+	struct ion_cma_buffer_info *info = buffer->priv_virt;
+
+	return info->table;
+}
+
+void ion_cma_heap_unmap_dma(struct ion_heap *heap,
+			       struct ion_buffer *buffer)
+{
+	return;
+}
+
+static int ion_cma_mmap(struct ion_heap *mapper, struct ion_buffer *buffer,
+			struct vm_area_struct *vma)
+{
+	struct ion_cma_heap *cma_heap = to_cma_heap(buffer->heap);
+	struct device *dev = cma_heap->dev;
+	struct ion_cma_buffer_info *info = buffer->priv_virt;
+
+	return dma_mmap_coherent(dev, vma, info->cpu_addr, info->handle,
+				 buffer->size);
+}
+
+void *ion_cma_map_kernel(struct ion_heap *heap, struct ion_buffer *buffer)
+{
+	struct ion_cma_buffer_info *info = buffer->priv_virt;
+	/* kernel memory mapping has been done at allocation time */
+	return info->cpu_addr;
+}
+
+static struct ion_heap_ops ion_cma_ops = {
+	.allocate = ion_cma_allocate,
+	.free = ion_cma_free,
+	.map_dma = ion_cma_heap_map_dma,
+	.unmap_dma = ion_cma_heap_unmap_dma,
+	.phys = ion_cma_phys,
+	.map_user = ion_cma_mmap,
+	.map_kernel = ion_cma_map_kernel,
+};
+
+struct ion_heap *ion_cma_heap_create(struct ion_platform_heap *data)
+{
+	struct ion_cma_heap *cma_heap;
+
+	cma_heap = kzalloc(sizeof(struct ion_cma_heap), GFP_KERNEL);
+
+	if (!cma_heap)
+		return ERR_PTR(-ENOMEM);
+
+	cma_heap->heap.ops = &ion_cma_ops;
+	/* get device from private heaps data, later it will be
+	 * used to make the link with reserved CMA memory */
+	cma_heap->dev = data->priv;
+	cma_heap->heap.type = ION_HEAP_TYPE_DMA;
+	return &cma_heap->heap;
+}
+
+void ion_cma_heap_destroy(struct ion_heap *heap)
+{
+	struct ion_cma_heap *cma_heap = to_cma_heap(heap);
+
+	kfree(cma_heap);
+}
diff --git a/drivers/staging/android/ion/ion_heap.c b/drivers/staging/android/ion/ion_heap.c
new file mode 100644
index 00000000000..9be246f50a0
--- /dev/null
+++ b/drivers/staging/android/ion/ion_heap.c
@@ -0,0 +1,320 @@
+/*
+ * drivers/gpu/ion/ion_heap.c
+ *
+ * Copyright (C) 2011 Google, Inc.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ *
+ */
+
+#include <linux/err.h>
+#include <linux/freezer.h>
+#include <linux/kthread.h>
+#include <linux/mm.h>
+#include <linux/rtmutex.h>
+#include <linux/sched.h>
+#include <linux/scatterlist.h>
+#include <linux/vmalloc.h>
+#include "ion.h"
+#include "ion_priv.h"
+
+void *ion_heap_map_kernel(struct ion_heap *heap,
+			  struct ion_buffer *buffer)
+{
+	struct scatterlist *sg;
+	int i, j;
+	void *vaddr;
+	pgprot_t pgprot;
+	struct sg_table *table = buffer->sg_table;
+	int npages = PAGE_ALIGN(buffer->size) / PAGE_SIZE;
+	struct page **pages = vmalloc(sizeof(struct page *) * npages);
+	struct page **tmp = pages;
+
+	if (!pages)
+		return 0;
+
+	if (buffer->flags & ION_FLAG_CACHED)
+		pgprot = PAGE_KERNEL;
+	else
+		pgprot = pgprot_writecombine(PAGE_KERNEL);
+
+	for_each_sg(table->sgl, sg, table->nents, i) {
+		int npages_this_entry = PAGE_ALIGN(sg_dma_len(sg)) / PAGE_SIZE;
+		struct page *page = sg_page(sg);
+		BUG_ON(i >= npages);
+		for (j = 0; j < npages_this_entry; j++) {
+			*(tmp++) = page++;
+		}
+	}
+	vaddr = vmap(pages, npages, VM_MAP, pgprot);
+	vfree(pages);
+
+	if (vaddr == NULL)
+		return ERR_PTR(-ENOMEM);
+
+	return vaddr;
+}
+
+void ion_heap_unmap_kernel(struct ion_heap *heap,
+			   struct ion_buffer *buffer)
+{
+	vunmap(buffer->vaddr);
+}
+
+int ion_heap_map_user(struct ion_heap *heap, struct ion_buffer *buffer,
+		      struct vm_area_struct *vma)
+{
+	struct sg_table *table = buffer->sg_table;
+	unsigned long addr = vma->vm_start;
+	unsigned long offset = vma->vm_pgoff * PAGE_SIZE;
+	struct scatterlist *sg;
+	int i;
+
+	for_each_sg(table->sgl, sg, table->nents, i) {
+		struct page *page = sg_page(sg);
+		unsigned long remainder = vma->vm_end - addr;
+		unsigned long len = sg_dma_len(sg);
+
+		if (offset >= sg_dma_len(sg)) {
+			offset -= sg_dma_len(sg);
+			continue;
+		} else if (offset) {
+			page += offset / PAGE_SIZE;
+			len = sg_dma_len(sg) - offset;
+			offset = 0;
+		}
+		len = min(len, remainder);
+		remap_pfn_range(vma, addr, page_to_pfn(page), len,
+				vma->vm_page_prot);
+		addr += len;
+		if (addr >= vma->vm_end)
+			return 0;
+	}
+	return 0;
+}
+
+int ion_heap_buffer_zero(struct ion_buffer *buffer)
+{
+	struct sg_table *table = buffer->sg_table;
+	pgprot_t pgprot;
+	struct scatterlist *sg;
+	struct vm_struct *vm_struct;
+	int i, j, ret = 0;
+
+	if (buffer->flags & ION_FLAG_CACHED)
+		pgprot = PAGE_KERNEL;
+	else
+		pgprot = pgprot_writecombine(PAGE_KERNEL);
+
+	vm_struct = get_vm_area(PAGE_SIZE, VM_ALLOC);
+	if (!vm_struct)
+		return -ENOMEM;
+
+	for_each_sg(table->sgl, sg, table->nents, i) {
+		struct page *page = sg_page(sg);
+		unsigned long len = sg_dma_len(sg);
+
+		for (j = 0; j < len / PAGE_SIZE; j++) {
+			struct page *sub_page = page + j;
+			struct page **pages = &sub_page;
+			ret = map_vm_area(vm_struct, pgprot, &pages);
+			if (ret)
+				goto end;
+			memset(vm_struct->addr, 0, PAGE_SIZE);
+			unmap_kernel_range((unsigned long)vm_struct->addr,
+					   PAGE_SIZE);
+		}
+	}
+end:
+	free_vm_area(vm_struct);
+	return ret;
+}
+
+struct page *ion_heap_alloc_pages(struct ion_buffer *buffer, gfp_t gfp_flags,
+				  unsigned int order)
+{
+	struct page *page = alloc_pages(gfp_flags, order);
+
+	if (!page)
+		return page;
+
+	if (ion_buffer_fault_user_mappings(buffer))
+		split_page(page, order);
+
+	return page;
+}
+
+void ion_heap_free_pages(struct ion_buffer *buffer, struct page *page,
+			 unsigned int order)
+{
+	int i;
+
+	if (!ion_buffer_fault_user_mappings(buffer)) {
+		__free_pages(page, order);
+		return;
+	}
+	for (i = 0; i < (1 << order); i++)
+		__free_page(page + i);
+}
+
+void ion_heap_freelist_add(struct ion_heap *heap, struct ion_buffer * buffer)
+{
+	rt_mutex_lock(&heap->lock);
+	list_add(&buffer->list, &heap->free_list);
+	heap->free_list_size += buffer->size;
+	rt_mutex_unlock(&heap->lock);
+	wake_up(&heap->waitqueue);
+}
+
+size_t ion_heap_freelist_size(struct ion_heap *heap)
+{
+	size_t size;
+
+	rt_mutex_lock(&heap->lock);
+	size = heap->free_list_size;
+	rt_mutex_unlock(&heap->lock);
+
+	return size;
+}
+
+size_t ion_heap_freelist_drain(struct ion_heap *heap, size_t size)
+{
+	struct ion_buffer *buffer, *tmp;
+	size_t total_drained = 0;
+
+	if (ion_heap_freelist_size(heap) == 0)
+		return 0;
+
+	rt_mutex_lock(&heap->lock);
+	if (size == 0)
+		size = heap->free_list_size;
+
+	list_for_each_entry_safe(buffer, tmp, &heap->free_list, list) {
+		if (total_drained >= size)
+			break;
+		list_del(&buffer->list);
+		ion_buffer_destroy(buffer);
+		heap->free_list_size -= buffer->size;
+		total_drained += buffer->size;
+	}
+	rt_mutex_unlock(&heap->lock);
+
+	return total_drained;
+}
+
+int ion_heap_deferred_free(void *data)
+{
+	struct ion_heap *heap = data;
+
+	while (true) {
+		struct ion_buffer *buffer;
+
+		wait_event_freezable(heap->waitqueue,
+				     ion_heap_freelist_size(heap) > 0);
+
+		rt_mutex_lock(&heap->lock);
+		if (list_empty(&heap->free_list)) {
+			rt_mutex_unlock(&heap->lock);
+			continue;
+		}
+		buffer = list_first_entry(&heap->free_list, struct ion_buffer,
+					  list);
+		list_del(&buffer->list);
+		heap->free_list_size -= buffer->size;
+		rt_mutex_unlock(&heap->lock);
+		ion_buffer_destroy(buffer);
+	}
+
+	return 0;
+}
+
+int ion_heap_init_deferred_free(struct ion_heap *heap)
+{
+	struct sched_param param = { .sched_priority = 0 };
+
+	INIT_LIST_HEAD(&heap->free_list);
+	heap->free_list_size = 0;
+	rt_mutex_init(&heap->lock);
+	init_waitqueue_head(&heap->waitqueue);
+	heap->task = kthread_run(ion_heap_deferred_free, heap,
+				 "%s", heap->name);
+	sched_setscheduler(heap->task, SCHED_IDLE, &param);
+	if (IS_ERR(heap->task)) {
+		pr_err("%s: creating thread for deferred free failed\n",
+		       __func__);
+		return PTR_RET(heap->task);
+	}
+	return 0;
+}
+
+struct ion_heap *ion_heap_create(struct ion_platform_heap *heap_data)
+{
+	struct ion_heap *heap = NULL;
+
+	switch (heap_data->type) {
+	case ION_HEAP_TYPE_SYSTEM_CONTIG:
+		heap = ion_system_contig_heap_create(heap_data);
+		break;
+	case ION_HEAP_TYPE_SYSTEM:
+		heap = ion_system_heap_create(heap_data);
+		break;
+	case ION_HEAP_TYPE_CARVEOUT:
+		heap = ion_carveout_heap_create(heap_data);
+		break;
+	case ION_HEAP_TYPE_CHUNK:
+		heap = ion_chunk_heap_create(heap_data);
+		break;
+	case ION_HEAP_TYPE_DMA:
+		heap = ion_cma_heap_create(heap_data);
+		break;
+	default:
+		pr_err("%s: Invalid heap type %d\n", __func__,
+		       heap_data->type);
+		return ERR_PTR(-EINVAL);
+	}
+
+	if (IS_ERR_OR_NULL(heap)) {
+		pr_err("%s: error creating heap %s type %d base %lu size %u\n",
+		       __func__, heap_data->name, heap_data->type,
+		       heap_data->base, heap_data->size);
+		return ERR_PTR(-EINVAL);
+	}
+
+	heap->name = heap_data->name;
+	heap->id = heap_data->id;
+	return heap;
+}
+
+void ion_heap_destroy(struct ion_heap *heap)
+{
+	if (!heap)
+		return;
+
+	switch (heap->type) {
+	case ION_HEAP_TYPE_SYSTEM_CONTIG:
+		ion_system_contig_heap_destroy(heap);
+		break;
+	case ION_HEAP_TYPE_SYSTEM:
+		ion_system_heap_destroy(heap);
+		break;
+	case ION_HEAP_TYPE_CARVEOUT:
+		ion_carveout_heap_destroy(heap);
+		break;
+	case ION_HEAP_TYPE_CHUNK:
+		ion_chunk_heap_destroy(heap);
+		break;
+	case ION_HEAP_TYPE_DMA:
+		ion_cma_heap_destroy(heap);
+		break;
+	default:
+		pr_err("%s: Invalid heap type %d\n", __func__,
+		       heap->type);
+	}
+}
diff --git a/drivers/staging/android/ion/ion_page_pool.c b/drivers/staging/android/ion/ion_page_pool.c
new file mode 100644
index 00000000000..7e00f51292e
--- /dev/null
+++ b/drivers/staging/android/ion/ion_page_pool.c
@@ -0,0 +1,200 @@
+/*
+ * drivers/gpu/ion/ion_mem_pool.c
+ *
+ * Copyright (C) 2011 Google, Inc.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ *
+ */
+
+#include <linux/debugfs.h>
+#include <linux/dma-mapping.h>
+#include <linux/err.h>
+#include <linux/fs.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include "ion_priv.h"
+
+struct ion_page_pool_item {
+	struct page *page;
+	struct list_head list;
+};
+
+static void *ion_page_pool_alloc_pages(struct ion_page_pool *pool)
+{
+	struct page *page = alloc_pages(pool->gfp_mask, pool->order);
+
+	if (!page)
+		return NULL;
+	/* this is only being used to flush the page for dma,
+	   this api is not really suitable for calling from a driver
+	   but no better way to flush a page for dma exist at this time */
+	arm_dma_ops.sync_single_for_device(NULL,
+					   pfn_to_dma(NULL, page_to_pfn(page)),
+					   PAGE_SIZE << pool->order,
+					   DMA_BIDIRECTIONAL);
+	return page;
+}
+
+static void ion_page_pool_free_pages(struct ion_page_pool *pool,
+				     struct page *page)
+{
+	__free_pages(page, pool->order);
+}
+
+static int ion_page_pool_add(struct ion_page_pool *pool, struct page *page)
+{
+	struct ion_page_pool_item *item;
+
+	item = kmalloc(sizeof(struct ion_page_pool_item), GFP_KERNEL);
+	if (!item)
+		return -ENOMEM;
+
+	mutex_lock(&pool->mutex);
+	item->page = page;
+	if (PageHighMem(page)) {
+		list_add_tail(&item->list, &pool->high_items);
+		pool->high_count++;
+	} else {
+		list_add_tail(&item->list, &pool->low_items);
+		pool->low_count++;
+	}
+	mutex_unlock(&pool->mutex);
+	return 0;
+}
+
+static struct page *ion_page_pool_remove(struct ion_page_pool *pool, bool high)
+{
+	struct ion_page_pool_item *item;
+	struct page *page;
+
+	if (high) {
+		BUG_ON(!pool->high_count);
+		item = list_first_entry(&pool->high_items,
+					struct ion_page_pool_item, list);
+		pool->high_count--;
+	} else {
+		BUG_ON(!pool->low_count);
+		item = list_first_entry(&pool->low_items,
+					struct ion_page_pool_item, list);
+		pool->low_count--;
+	}
+
+	list_del(&item->list);
+	page = item->page;
+	kfree(item);
+	return page;
+}
+
+void *ion_page_pool_alloc(struct ion_page_pool *pool)
+{
+	struct page *page = NULL;
+
+	BUG_ON(!pool);
+
+	mutex_lock(&pool->mutex);
+	if (pool->high_count)
+		page = ion_page_pool_remove(pool, true);
+	else if (pool->low_count)
+		page = ion_page_pool_remove(pool, false);
+	mutex_unlock(&pool->mutex);
+
+	if (!page)
+		page = ion_page_pool_alloc_pages(pool);
+
+	return page;
+}
+
+void ion_page_pool_free(struct ion_page_pool *pool, struct page* page)
+{
+	int ret;
+
+	ret = ion_page_pool_add(pool, page);
+	if (ret)
+		ion_page_pool_free_pages(pool, page);
+}
+
+static int ion_page_pool_total(struct ion_page_pool *pool, bool high)
+{
+	int total = 0;
+
+	total += high ? (pool->high_count + pool->low_count) *
+		(1 << pool->order) :
+			pool->low_count * (1 << pool->order);
+	return total;
+}
+
+int ion_page_pool_shrink(struct ion_page_pool *pool, gfp_t gfp_mask,
+				int nr_to_scan)
+{
+	int nr_freed = 0;
+	int i;
+	bool high;
+
+	high = gfp_mask & __GFP_HIGHMEM;
+
+	if (nr_to_scan == 0)
+		return ion_page_pool_total(pool, high);
+
+	for (i = 0; i < nr_to_scan; i++) {
+		struct page *page;
+
+		mutex_lock(&pool->mutex);
+		if (high && pool->high_count) {
+			page = ion_page_pool_remove(pool, true);
+		} else if (pool->low_count) {
+			page = ion_page_pool_remove(pool, false);
+		} else {
+			mutex_unlock(&pool->mutex);
+			break;
+		}
+		mutex_unlock(&pool->mutex);
+		ion_page_pool_free_pages(pool, page);
+		nr_freed += (1 << pool->order);
+	}
+
+	return nr_freed;
+}
+
+struct ion_page_pool *ion_page_pool_create(gfp_t gfp_mask, unsigned int order)
+{
+	struct ion_page_pool *pool = kmalloc(sizeof(struct ion_page_pool),
+					     GFP_KERNEL);
+	if (!pool)
+		return NULL;
+	pool->high_count = 0;
+	pool->low_count = 0;
+	INIT_LIST_HEAD(&pool->low_items);
+	INIT_LIST_HEAD(&pool->high_items);
+	pool->gfp_mask = gfp_mask;
+	pool->order = order;
+	mutex_init(&pool->mutex);
+	plist_node_init(&pool->list, order);
+
+	return pool;
+}
+
+void ion_page_pool_destroy(struct ion_page_pool *pool)
+{
+	kfree(pool);
+}
+
+static int __init ion_page_pool_init(void)
+{
+	return 0;
+}
+
+static void __exit ion_page_pool_exit(void)
+{
+}
+
+module_init(ion_page_pool_init);
+module_exit(ion_page_pool_exit);
diff --git a/drivers/staging/android/ion/ion_priv.h b/drivers/staging/android/ion/ion_priv.h
new file mode 100644
index 00000000000..0ccf409cde7
--- /dev/null
+++ b/drivers/staging/android/ion/ion_priv.h
@@ -0,0 +1,360 @@
+/*
+ * drivers/gpu/ion/ion_priv.h
+ *
+ * Copyright (C) 2011 Google, Inc.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ *
+ */
+
+#ifndef _ION_PRIV_H
+#define _ION_PRIV_H
+
+#include <linux/kref.h>
+#include <linux/mm_types.h>
+#include <linux/mutex.h>
+#include <linux/rbtree.h>
+#include <linux/sched.h>
+#include <linux/shrinker.h>
+#include <linux/types.h>
+
+#include "ion.h"
+
+struct ion_buffer *ion_handle_buffer(struct ion_handle *handle);
+
+/**
+ * struct ion_buffer - metadata for a particular buffer
+ * @ref:		refernce count
+ * @node:		node in the ion_device buffers tree
+ * @dev:		back pointer to the ion_device
+ * @heap:		back pointer to the heap the buffer came from
+ * @flags:		buffer specific flags
+ * @size:		size of the buffer
+ * @priv_virt:		private data to the buffer representable as
+ *			a void *
+ * @priv_phys:		private data to the buffer representable as
+ *			an ion_phys_addr_t (and someday a phys_addr_t)
+ * @lock:		protects the buffers cnt fields
+ * @kmap_cnt:		number of times the buffer is mapped to the kernel
+ * @vaddr:		the kenrel mapping if kmap_cnt is not zero
+ * @dmap_cnt:		number of times the buffer is mapped for dma
+ * @sg_table:		the sg table for the buffer if dmap_cnt is not zero
+ * @pages:		flat array of pages in the buffer -- used by fault
+ *			handler and only valid for buffers that are faulted in
+ * @vmas:		list of vma's mapping this buffer
+ * @handle_count:	count of handles referencing this buffer
+ * @task_comm:		taskcomm of last client to reference this buffer in a
+ *			handle, used for debugging
+ * @pid:		pid of last client to reference this buffer in a
+ *			handle, used for debugging
+*/
+struct ion_buffer {
+	struct kref ref;
+	union {
+		struct rb_node node;
+		struct list_head list;
+	};
+	struct ion_device *dev;
+	struct ion_heap *heap;
+	unsigned long flags;
+	size_t size;
+	union {
+		void *priv_virt;
+		ion_phys_addr_t priv_phys;
+	};
+	struct mutex lock;
+	int kmap_cnt;
+	void *vaddr;
+	int dmap_cnt;
+	struct sg_table *sg_table;
+	struct page **pages;
+	struct list_head vmas;
+	/* used to track orphaned buffers */
+	int handle_count;
+	char task_comm[TASK_COMM_LEN];
+	pid_t pid;
+};
+void ion_buffer_destroy(struct ion_buffer *buffer);
+
+/**
+ * struct ion_heap_ops - ops to operate on a given heap
+ * @allocate:		allocate memory
+ * @free:		free memory
+ * @phys		get physical address of a buffer (only define on
+ *			physically contiguous heaps)
+ * @map_dma		map the memory for dma to a scatterlist
+ * @unmap_dma		unmap the memory for dma
+ * @map_kernel		map memory to the kernel
+ * @unmap_kernel	unmap memory to the kernel
+ * @map_user		map memory to userspace
+ *
+ * allocate, phys, and map_user return 0 on success, -errno on error.
+ * map_dma and map_kernel return pointer on success, ERR_PTR on error.
+ */
+struct ion_heap_ops {
+	int (*allocate) (struct ion_heap *heap,
+			 struct ion_buffer *buffer, unsigned long len,
+			 unsigned long align, unsigned long flags);
+	void (*free) (struct ion_buffer *buffer);
+	int (*phys) (struct ion_heap *heap, struct ion_buffer *buffer,
+		     ion_phys_addr_t *addr, size_t *len);
+	struct sg_table *(*map_dma) (struct ion_heap *heap,
+					struct ion_buffer *buffer);
+	void (*unmap_dma) (struct ion_heap *heap, struct ion_buffer *buffer);
+	void * (*map_kernel) (struct ion_heap *heap, struct ion_buffer *buffer);
+	void (*unmap_kernel) (struct ion_heap *heap, struct ion_buffer *buffer);
+	int (*map_user) (struct ion_heap *mapper, struct ion_buffer *buffer,
+			 struct vm_area_struct *vma);
+};
+
+/**
+ * heap flags - flags between the heaps and core ion code
+ */
+#define ION_HEAP_FLAG_DEFER_FREE (1 << 0)
+
+/**
+ * struct ion_heap - represents a heap in the system
+ * @node:		rb node to put the heap on the device's tree of heaps
+ * @dev:		back pointer to the ion_device
+ * @type:		type of heap
+ * @ops:		ops struct as above
+ * @flags:		flags
+ * @id:			id of heap, also indicates priority of this heap when
+ *			allocating.  These are specified by platform data and
+ *			MUST be unique
+ * @name:		used for debugging
+ * @shrinker:		a shrinker for the heap, if the heap caches system
+ *			memory, it must define a shrinker to return it on low
+ *			memory conditions, this includes system memory cached
+ *			in the deferred free lists for heaps that support it
+ * @free_list:		free list head if deferred free is used
+ * @free_list_size	size of the deferred free list in bytes
+ * @lock:		protects the free list
+ * @waitqueue:		queue to wait on from deferred free thread
+ * @task:		task struct of deferred free thread
+ * @debug_show:		called when heap debug file is read to add any
+ *			heap specific debug info to output
+ *
+ * Represents a pool of memory from which buffers can be made.  In some
+ * systems the only heap is regular system memory allocated via vmalloc.
+ * On others, some blocks might require large physically contiguous buffers
+ * that are allocated from a specially reserved heap.
+ */
+struct ion_heap {
+	struct plist_node node;
+	struct ion_device *dev;
+	enum ion_heap_type type;
+	struct ion_heap_ops *ops;
+	unsigned long flags;
+	unsigned int id;
+	const char *name;
+	struct shrinker shrinker;
+	struct list_head free_list;
+	size_t free_list_size;
+	struct rt_mutex lock;
+	wait_queue_head_t waitqueue;
+	struct task_struct *task;
+	int (*debug_show)(struct ion_heap *heap, struct seq_file *, void *);
+};
+
+/**
+ * ion_buffer_cached - this ion buffer is cached
+ * @buffer:		buffer
+ *
+ * indicates whether this ion buffer is cached
+ */
+bool ion_buffer_cached(struct ion_buffer *buffer);
+
+/**
+ * ion_buffer_fault_user_mappings - fault in user mappings of this buffer
+ * @buffer:		buffer
+ *
+ * indicates whether userspace mappings of this buffer will be faulted
+ * in, this can affect how buffers are allocated from the heap.
+ */
+bool ion_buffer_fault_user_mappings(struct ion_buffer *buffer);
+
+/**
+ * ion_device_create - allocates and returns an ion device
+ * @custom_ioctl:	arch specific ioctl function if applicable
+ *
+ * returns a valid device or -PTR_ERR
+ */
+struct ion_device *ion_device_create(long (*custom_ioctl)
+				     (struct ion_client *client,
+				      unsigned int cmd,
+				      unsigned long arg));
+
+/**
+ * ion_device_destroy - free and device and it's resource
+ * @dev:		the device
+ */
+void ion_device_destroy(struct ion_device *dev);
+
+/**
+ * ion_device_add_heap - adds a heap to the ion device
+ * @dev:		the device
+ * @heap:		the heap to add
+ */
+void ion_device_add_heap(struct ion_device *dev, struct ion_heap *heap);
+
+/**
+ * some helpers for common operations on buffers using the sg_table
+ * and vaddr fields
+ */
+void *ion_heap_map_kernel(struct ion_heap *, struct ion_buffer *);
+void ion_heap_unmap_kernel(struct ion_heap *, struct ion_buffer *);
+int ion_heap_map_user(struct ion_heap *, struct ion_buffer *,
+			struct vm_area_struct *);
+int ion_heap_buffer_zero(struct ion_buffer *buffer);
+
+/**
+ * ion_heap_alloc_pages - allocate pages from alloc_pages
+ * @buffer:		the buffer to allocate for, used to extract the flags
+ * @gfp_flags:		the gfp_t for the allocation
+ * @order:		the order of the allocatoin
+ *
+ * This funciton allocations from alloc pages and also does any other
+ * necessary operations based on the buffer->flags.  For buffers which
+ * will be faulted in the pages are split using split_page
+ */
+struct page *ion_heap_alloc_pages(struct ion_buffer *buffer, gfp_t gfp_flags,
+				  unsigned int order);
+
+/**
+ * ion_heap_init_deferred_free -- initialize deferred free functionality
+ * @heap:		the heap
+ *
+ * If a heap sets the ION_HEAP_FLAG_DEFER_FREE flag this function will
+ * be called to setup deferred frees. Calls to free the buffer will
+ * return immediately and the actual free will occur some time later
+ */
+int ion_heap_init_deferred_free(struct ion_heap *heap);
+
+/**
+ * ion_heap_freelist_add - add a buffer to the deferred free list
+ * @heap:		the heap
+ * @buffer: 		the buffer
+ *
+ * Adds an item to the deferred freelist.
+ */
+void ion_heap_freelist_add(struct ion_heap *heap, struct ion_buffer *buffer);
+
+/**
+ * ion_heap_freelist_drain - drain the deferred free list
+ * @heap:		the heap
+ * @size:		ammount of memory to drain in bytes
+ *
+ * Drains the indicated amount of memory from the deferred freelist immediately.
+ * Returns the total amount freed.  The total freed may be higher depending
+ * on the size of the items in the list, or lower if there is insufficient
+ * total memory on the freelist.
+ */
+size_t ion_heap_freelist_drain(struct ion_heap *heap, size_t size);
+
+/**
+ * ion_heap_freelist_size - returns the size of the freelist in bytes
+ * @heap:		the heap
+ */
+size_t ion_heap_freelist_size(struct ion_heap *heap);
+
+
+/**
+ * functions for creating and destroying the built in ion heaps.
+ * architectures can add their own custom architecture specific
+ * heaps as appropriate.
+ */
+
+struct ion_heap *ion_heap_create(struct ion_platform_heap *);
+void ion_heap_destroy(struct ion_heap *);
+struct ion_heap *ion_system_heap_create(struct ion_platform_heap *);
+void ion_system_heap_destroy(struct ion_heap *);
+
+struct ion_heap *ion_system_contig_heap_create(struct ion_platform_heap *);
+void ion_system_contig_heap_destroy(struct ion_heap *);
+
+struct ion_heap *ion_carveout_heap_create(struct ion_platform_heap *);
+void ion_carveout_heap_destroy(struct ion_heap *);
+
+struct ion_heap *ion_chunk_heap_create(struct ion_platform_heap *);
+void ion_chunk_heap_destroy(struct ion_heap *);
+struct ion_heap *ion_cma_heap_create(struct ion_platform_heap *);
+void ion_cma_heap_destroy(struct ion_heap *);
+
+/**
+ * kernel api to allocate/free from carveout -- used when carveout is
+ * used to back an architecture specific custom heap
+ */
+ion_phys_addr_t ion_carveout_allocate(struct ion_heap *heap, unsigned long size,
+				      unsigned long align);
+void ion_carveout_free(struct ion_heap *heap, ion_phys_addr_t addr,
+		       unsigned long size);
+/**
+ * The carveout heap returns physical addresses, since 0 may be a valid
+ * physical address, this is used to indicate allocation failed
+ */
+#define ION_CARVEOUT_ALLOCATE_FAIL -1
+
+/**
+ * functions for creating and destroying a heap pool -- allows you
+ * to keep a pool of pre allocated memory to use from your heap.  Keeping
+ * a pool of memory that is ready for dma, ie any cached mapping have been
+ * invalidated from the cache, provides a significant peformance benefit on
+ * many systems */
+
+/**
+ * struct ion_page_pool - pagepool struct
+ * @high_count:		number of highmem items in the pool
+ * @low_count:		number of lowmem items in the pool
+ * @high_items:		list of highmem items
+ * @low_items:		list of lowmem items
+ * @shrinker:		a shrinker for the items
+ * @mutex:		lock protecting this struct and especially the count
+ *			item list
+ * @alloc:		function to be used to allocate pageory when the pool
+ *			is empty
+ * @free:		function to be used to free pageory back to the system
+ *			when the shrinker fires
+ * @gfp_mask:		gfp_mask to use from alloc
+ * @order:		order of pages in the pool
+ * @list:		plist node for list of pools
+ *
+ * Allows you to keep a pool of pre allocated pages to use from your heap.
+ * Keeping a pool of pages that is ready for dma, ie any cached mapping have
+ * been invalidated from the cache, provides a significant peformance benefit
+ * on many systems
+ */
+struct ion_page_pool {
+	int high_count;
+	int low_count;
+	struct list_head high_items;
+	struct list_head low_items;
+	struct mutex mutex;
+	gfp_t gfp_mask;
+	unsigned int order;
+	struct plist_node list;
+};
+
+struct ion_page_pool *ion_page_pool_create(gfp_t gfp_mask, unsigned int order);
+void ion_page_pool_destroy(struct ion_page_pool *);
+void *ion_page_pool_alloc(struct ion_page_pool *);
+void ion_page_pool_free(struct ion_page_pool *, struct page *);
+
+/** ion_page_pool_shrink - shrinks the size of the memory cached in the pool
+ * @pool:		the pool
+ * @gfp_mask:		the memory type to reclaim
+ * @nr_to_scan:		number of items to shrink in pages
+ *
+ * returns the number of items freed in pages
+ */
+int ion_page_pool_shrink(struct ion_page_pool *pool, gfp_t gfp_mask,
+			  int nr_to_scan);
+
+#endif /* _ION_PRIV_H */
diff --git a/drivers/staging/android/ion/ion_system_heap.c b/drivers/staging/android/ion/ion_system_heap.c
new file mode 100644
index 00000000000..06e0702396a
--- /dev/null
+++ b/drivers/staging/android/ion/ion_system_heap.c
@@ -0,0 +1,450 @@
+/*
+ * drivers/gpu/ion/ion_system_heap.c
+ *
+ * Copyright (C) 2011 Google, Inc.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ *
+ */
+
+#include <asm/page.h>
+#include <linux/dma-mapping.h>
+#include <linux/err.h>
+#include <linux/highmem.h>
+#include <linux/mm.h>
+#include <linux/scatterlist.h>
+#include <linux/seq_file.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include "ion.h"
+#include "ion_priv.h"
+
+static unsigned int high_order_gfp_flags = (GFP_HIGHUSER | __GFP_ZERO |
+					    __GFP_NOWARN | __GFP_NORETRY) &
+					   ~__GFP_WAIT;
+static unsigned int low_order_gfp_flags  = (GFP_HIGHUSER | __GFP_ZERO |
+					 __GFP_NOWARN);
+static const unsigned int orders[] = {8, 4, 0};
+static const int num_orders = ARRAY_SIZE(orders);
+static int order_to_index(unsigned int order)
+{
+	int i;
+	for (i = 0; i < num_orders; i++)
+		if (order == orders[i])
+			return i;
+	BUG();
+	return -1;
+}
+
+static unsigned int order_to_size(int order)
+{
+	return PAGE_SIZE << order;
+}
+
+struct ion_system_heap {
+	struct ion_heap heap;
+	struct ion_page_pool **pools;
+};
+
+struct page_info {
+	struct page *page;
+	unsigned int order;
+	struct list_head list;
+};
+
+static struct page *alloc_buffer_page(struct ion_system_heap *heap,
+				      struct ion_buffer *buffer,
+				      unsigned long order)
+{
+	bool cached = ion_buffer_cached(buffer);
+	struct ion_page_pool *pool = heap->pools[order_to_index(order)];
+	struct page *page;
+
+	if (!cached) {
+		page = ion_page_pool_alloc(pool);
+	} else {
+		gfp_t gfp_flags = low_order_gfp_flags;
+
+		if (order > 4)
+			gfp_flags = high_order_gfp_flags;
+		page = ion_heap_alloc_pages(buffer, gfp_flags, order);
+		if (!page)
+			return 0;
+		arm_dma_ops.sync_single_for_device(NULL,
+			pfn_to_dma(NULL, page_to_pfn(page)),
+			PAGE_SIZE << order, DMA_BIDIRECTIONAL);
+	}
+	if (!page)
+		return 0;
+
+	return page;
+}
+
+static void free_buffer_page(struct ion_system_heap *heap,
+			     struct ion_buffer *buffer, struct page *page,
+			     unsigned int order)
+{
+	bool cached = ion_buffer_cached(buffer);
+	bool split_pages = ion_buffer_fault_user_mappings(buffer);
+	int i;
+
+	if (!cached) {
+		struct ion_page_pool *pool = heap->pools[order_to_index(order)];
+		ion_page_pool_free(pool, page);
+	} else if (split_pages) {
+		for (i = 0; i < (1 << order); i++)
+			__free_page(page + i);
+	} else {
+		__free_pages(page, order);
+	}
+}
+
+
+static struct page_info *alloc_largest_available(struct ion_system_heap *heap,
+						 struct ion_buffer *buffer,
+						 unsigned long size,
+						 unsigned int max_order)
+{
+	struct page *page;
+	struct page_info *info;
+	int i;
+
+	for (i = 0; i < num_orders; i++) {
+		if (size < order_to_size(orders[i]))
+			continue;
+		if (max_order < orders[i])
+			continue;
+
+		page = alloc_buffer_page(heap, buffer, orders[i]);
+		if (!page)
+			continue;
+
+		info = kmalloc(sizeof(struct page_info), GFP_KERNEL);
+		info->page = page;
+		info->order = orders[i];
+		return info;
+	}
+	return NULL;
+}
+
+static int ion_system_heap_allocate(struct ion_heap *heap,
+				     struct ion_buffer *buffer,
+				     unsigned long size, unsigned long align,
+				     unsigned long flags)
+{
+	struct ion_system_heap *sys_heap = container_of(heap,
+							struct ion_system_heap,
+							heap);
+	struct sg_table *table;
+	struct scatterlist *sg;
+	int ret;
+	struct list_head pages;
+	struct page_info *info, *tmp_info;
+	int i = 0;
+	long size_remaining = PAGE_ALIGN(size);
+	unsigned int max_order = orders[0];
+
+	INIT_LIST_HEAD(&pages);
+	while (size_remaining > 0) {
+		info = alloc_largest_available(sys_heap, buffer, size_remaining, max_order);
+		if (!info)
+			goto err;
+		list_add_tail(&info->list, &pages);
+		size_remaining -= (1 << info->order) * PAGE_SIZE;
+		max_order = info->order;
+		i++;
+	}
+
+	table = kmalloc(sizeof(struct sg_table), GFP_KERNEL);
+	if (!table)
+		goto err;
+
+	ret = sg_alloc_table(table, i, GFP_KERNEL);
+	if (ret)
+		goto err1;
+
+	sg = table->sgl;
+	list_for_each_entry_safe(info, tmp_info, &pages, list) {
+		struct page *page = info->page;
+		sg_set_page(sg, page, (1 << info->order) * PAGE_SIZE, 0);
+		sg = sg_next(sg);
+		list_del(&info->list);
+		kfree(info);
+	}
+
+	buffer->priv_virt = table;
+	return 0;
+err1:
+	kfree(table);
+err:
+	list_for_each_entry(info, &pages, list) {
+		free_buffer_page(sys_heap, buffer, info->page, info->order);
+		kfree(info);
+	}
+	return -ENOMEM;
+}
+
+void ion_system_heap_free(struct ion_buffer *buffer)
+{
+	struct ion_heap *heap = buffer->heap;
+	struct ion_system_heap *sys_heap = container_of(heap,
+							struct ion_system_heap,
+							heap);
+	struct sg_table *table = buffer->sg_table;
+	bool cached = ion_buffer_cached(buffer);
+	struct scatterlist *sg;
+	LIST_HEAD(pages);
+	int i;
+
+	/* uncached pages come from the page pools, zero them before returning
+	   for security purposes (other allocations are zerod at alloc time */
+	if (!cached)
+		ion_heap_buffer_zero(buffer);
+
+	for_each_sg(table->sgl, sg, table->nents, i)
+		free_buffer_page(sys_heap, buffer, sg_page(sg),
+				get_order(sg_dma_len(sg)));
+	sg_free_table(table);
+	kfree(table);
+}
+
+struct sg_table *ion_system_heap_map_dma(struct ion_heap *heap,
+					 struct ion_buffer *buffer)
+{
+	return buffer->priv_virt;
+}
+
+void ion_system_heap_unmap_dma(struct ion_heap *heap,
+			       struct ion_buffer *buffer)
+{
+	return;
+}
+
+static struct ion_heap_ops system_heap_ops = {
+	.allocate = ion_system_heap_allocate,
+	.free = ion_system_heap_free,
+	.map_dma = ion_system_heap_map_dma,
+	.unmap_dma = ion_system_heap_unmap_dma,
+	.map_kernel = ion_heap_map_kernel,
+	.unmap_kernel = ion_heap_unmap_kernel,
+	.map_user = ion_heap_map_user,
+};
+
+static int ion_system_heap_shrink(struct shrinker *shrinker,
+				  struct shrink_control *sc) {
+
+	struct ion_heap *heap = container_of(shrinker, struct ion_heap,
+					     shrinker);
+	struct ion_system_heap *sys_heap = container_of(heap,
+							struct ion_system_heap,
+							heap);
+	int nr_total = 0;
+	int nr_freed = 0;
+	int i;
+
+	if (sc->nr_to_scan == 0)
+		goto end;
+
+	/* shrink the free list first, no point in zeroing the memory if
+	   we're just going to reclaim it */
+	nr_freed += ion_heap_freelist_drain(heap, sc->nr_to_scan * PAGE_SIZE) /
+		PAGE_SIZE;
+
+	if (nr_freed >= sc->nr_to_scan)
+		goto end;
+
+	for (i = 0; i < num_orders; i++) {
+		struct ion_page_pool *pool = sys_heap->pools[i];
+
+		nr_freed += ion_page_pool_shrink(pool, sc->gfp_mask,
+						 sc->nr_to_scan);
+		if (nr_freed >= sc->nr_to_scan)
+			break;
+	}
+
+end:
+	/* total number of items is whatever the page pools are holding
+	   plus whatever's in the freelist */
+	for (i = 0; i < num_orders; i++) {
+		struct ion_page_pool *pool = sys_heap->pools[i];
+		nr_total += ion_page_pool_shrink(pool, sc->gfp_mask, 0);
+	}
+	nr_total += ion_heap_freelist_size(heap) / PAGE_SIZE;
+	return nr_total;
+
+}
+
+static int ion_system_heap_debug_show(struct ion_heap *heap, struct seq_file *s,
+				      void *unused)
+{
+
+	struct ion_system_heap *sys_heap = container_of(heap,
+							struct ion_system_heap,
+							heap);
+	int i;
+	for (i = 0; i < num_orders; i++) {
+		struct ion_page_pool *pool = sys_heap->pools[i];
+		seq_printf(s, "%d order %u highmem pages in pool = %lu total\n",
+			   pool->high_count, pool->order,
+			   (1 << pool->order) * PAGE_SIZE * pool->high_count);
+		seq_printf(s, "%d order %u lowmem pages in pool = %lu total\n",
+			   pool->low_count, pool->order,
+			   (1 << pool->order) * PAGE_SIZE * pool->low_count);
+	}
+	return 0;
+}
+
+struct ion_heap *ion_system_heap_create(struct ion_platform_heap *unused)
+{
+	struct ion_system_heap *heap;
+	int i;
+
+	heap = kzalloc(sizeof(struct ion_system_heap), GFP_KERNEL);
+	if (!heap)
+		return ERR_PTR(-ENOMEM);
+	heap->heap.ops = &system_heap_ops;
+	heap->heap.type = ION_HEAP_TYPE_SYSTEM;
+	heap->heap.flags = ION_HEAP_FLAG_DEFER_FREE;
+	heap->pools = kzalloc(sizeof(struct ion_page_pool *) * num_orders,
+			      GFP_KERNEL);
+	if (!heap->pools)
+		goto err_alloc_pools;
+	for (i = 0; i < num_orders; i++) {
+		struct ion_page_pool *pool;
+		gfp_t gfp_flags = low_order_gfp_flags;
+
+		if (orders[i] > 4)
+			gfp_flags = high_order_gfp_flags;
+		pool = ion_page_pool_create(gfp_flags, orders[i]);
+		if (!pool)
+			goto err_create_pool;
+		heap->pools[i] = pool;
+	}
+
+	heap->heap.shrinker.shrink = ion_system_heap_shrink;
+	heap->heap.shrinker.seeks = DEFAULT_SEEKS;
+	heap->heap.shrinker.batch = 0;
+	register_shrinker(&heap->heap.shrinker);
+	heap->heap.debug_show = ion_system_heap_debug_show;
+	return &heap->heap;
+err_create_pool:
+	for (i = 0; i < num_orders; i++)
+		if (heap->pools[i])
+			ion_page_pool_destroy(heap->pools[i]);
+	kfree(heap->pools);
+err_alloc_pools:
+	kfree(heap);
+	return ERR_PTR(-ENOMEM);
+}
+
+void ion_system_heap_destroy(struct ion_heap *heap)
+{
+	struct ion_system_heap *sys_heap = container_of(heap,
+							struct ion_system_heap,
+							heap);
+	int i;
+
+	for (i = 0; i < num_orders; i++)
+		ion_page_pool_destroy(sys_heap->pools[i]);
+	kfree(sys_heap->pools);
+	kfree(sys_heap);
+}
+
+static int ion_system_contig_heap_allocate(struct ion_heap *heap,
+					   struct ion_buffer *buffer,
+					   unsigned long len,
+					   unsigned long align,
+					   unsigned long flags)
+{
+	buffer->priv_virt = kzalloc(len, GFP_KERNEL);
+	if (!buffer->priv_virt)
+		return -ENOMEM;
+	return 0;
+}
+
+void ion_system_contig_heap_free(struct ion_buffer *buffer)
+{
+	kfree(buffer->priv_virt);
+}
+
+static int ion_system_contig_heap_phys(struct ion_heap *heap,
+				       struct ion_buffer *buffer,
+				       ion_phys_addr_t *addr, size_t *len)
+{
+	*addr = virt_to_phys(buffer->priv_virt);
+	*len = buffer->size;
+	return 0;
+}
+
+struct sg_table *ion_system_contig_heap_map_dma(struct ion_heap *heap,
+						struct ion_buffer *buffer)
+{
+	struct sg_table *table;
+	int ret;
+
+	table = kzalloc(sizeof(struct sg_table), GFP_KERNEL);
+	if (!table)
+		return ERR_PTR(-ENOMEM);
+	ret = sg_alloc_table(table, 1, GFP_KERNEL);
+	if (ret) {
+		kfree(table);
+		return ERR_PTR(ret);
+	}
+	sg_set_page(table->sgl, virt_to_page(buffer->priv_virt), buffer->size,
+		    0);
+	return table;
+}
+
+void ion_system_contig_heap_unmap_dma(struct ion_heap *heap,
+				      struct ion_buffer *buffer)
+{
+	sg_free_table(buffer->sg_table);
+	kfree(buffer->sg_table);
+}
+
+int ion_system_contig_heap_map_user(struct ion_heap *heap,
+				    struct ion_buffer *buffer,
+				    struct vm_area_struct *vma)
+{
+	unsigned long pfn = __phys_to_pfn(virt_to_phys(buffer->priv_virt));
+	return remap_pfn_range(vma, vma->vm_start, pfn + vma->vm_pgoff,
+			       vma->vm_end - vma->vm_start,
+			       vma->vm_page_prot);
+
+}
+
+static struct ion_heap_ops kmalloc_ops = {
+	.allocate = ion_system_contig_heap_allocate,
+	.free = ion_system_contig_heap_free,
+	.phys = ion_system_contig_heap_phys,
+	.map_dma = ion_system_contig_heap_map_dma,
+	.unmap_dma = ion_system_contig_heap_unmap_dma,
+	.map_kernel = ion_heap_map_kernel,
+	.unmap_kernel = ion_heap_unmap_kernel,
+	.map_user = ion_system_contig_heap_map_user,
+};
+
+struct ion_heap *ion_system_contig_heap_create(struct ion_platform_heap *unused)
+{
+	struct ion_heap *heap;
+
+	heap = kzalloc(sizeof(struct ion_heap), GFP_KERNEL);
+	if (!heap)
+		return ERR_PTR(-ENOMEM);
+	heap->ops = &kmalloc_ops;
+	heap->type = ION_HEAP_TYPE_SYSTEM_CONTIG;
+	return heap;
+}
+
+void ion_system_contig_heap_destroy(struct ion_heap *heap)
+{
+	kfree(heap);
+}
+
diff --git a/drivers/staging/android/ion/tegra/Makefile b/drivers/staging/android/ion/tegra/Makefile
new file mode 100644
index 00000000000..11cd003fb08
--- /dev/null
+++ b/drivers/staging/android/ion/tegra/Makefile
@@ -0,0 +1 @@
+obj-y += tegra_ion.o
diff --git a/drivers/staging/android/ion/tegra/tegra_ion.c b/drivers/staging/android/ion/tegra/tegra_ion.c
new file mode 100644
index 00000000000..0849600bcc0
--- /dev/null
+++ b/drivers/staging/android/ion/tegra/tegra_ion.c
@@ -0,0 +1,96 @@
+/*
+ * drivers/gpu/tegra/tegra_ion.c
+ *
+ * Copyright (C) 2011 Google, Inc.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ *
+ */
+
+#include <linux/err.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include "../ion.h"
+#include "../ion_priv.h"
+
+struct ion_device *idev;
+struct ion_mapper *tegra_user_mapper;
+int num_heaps;
+struct ion_heap **heaps;
+
+int tegra_ion_probe(struct platform_device *pdev)
+{
+	struct ion_platform_data *pdata = pdev->dev.platform_data;
+	int err;
+	int i;
+
+	num_heaps = pdata->nr;
+
+	heaps = kzalloc(sizeof(struct ion_heap *) * pdata->nr, GFP_KERNEL);
+
+	idev = ion_device_create(NULL);
+	if (IS_ERR_OR_NULL(idev)) {
+		kfree(heaps);
+		return PTR_ERR(idev);
+	}
+
+	/* create the heaps as specified in the board file */
+	for (i = 0; i < num_heaps; i++) {
+		struct ion_platform_heap *heap_data = &pdata->heaps[i];
+
+		heaps[i] = ion_heap_create(heap_data);
+		if (IS_ERR_OR_NULL(heaps[i])) {
+			err = PTR_ERR(heaps[i]);
+			goto err;
+		}
+		ion_device_add_heap(idev, heaps[i]);
+	}
+	platform_set_drvdata(pdev, idev);
+	return 0;
+err:
+	for (i = 0; i < num_heaps; i++) {
+		if (heaps[i])
+			ion_heap_destroy(heaps[i]);
+	}
+	kfree(heaps);
+	return err;
+}
+
+int tegra_ion_remove(struct platform_device *pdev)
+{
+	struct ion_device *idev = platform_get_drvdata(pdev);
+	int i;
+
+	ion_device_destroy(idev);
+	for (i = 0; i < num_heaps; i++)
+		ion_heap_destroy(heaps[i]);
+	kfree(heaps);
+	return 0;
+}
+
+static struct platform_driver ion_driver = {
+	.probe = tegra_ion_probe,
+	.remove = tegra_ion_remove,
+	.driver = { .name = "ion-tegra" }
+};
+
+static int __init ion_init(void)
+{
+	return platform_driver_register(&ion_driver);
+}
+
+static void __exit ion_exit(void)
+{
+	platform_driver_unregister(&ion_driver);
+}
+
+module_init(ion_init);
+module_exit(ion_exit);
+