drivers/gpu/ion/ion_system_heap.c - kernel/msm - Gitiles

 /*
  * drivers/gpu/ion/ion_system_heap.c
  *
  * Copyright (C) 2011 Google, Inc.
  * Copyright (c) 2011-2013, The Linux Foundation. All rights reserved.
  *
  * 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/ion.h>
 #include <linux/mm.h>
 #include <linux/scatterlist.h>
 #include <linux/seq_file.h>
 #include <linux/slab.h>
 #include <linux/vmalloc.h>
 #include <linux/seq_file.h>
 #include "ion_priv.h"
 #include <mach/memory.h>
 #include <asm/cacheflush.h>
 #include <linux/msm_ion.h>
 #include <linux/dma-mapping.h>

 static atomic_t system_heap_allocated;
 static atomic_t system_contig_heap_allocated;

 static unsigned int high_order_gfp_flags = (GFP_HIGHUSER | __GFP_ZERO |
 					    __GFP_NOWARN | __GFP_NORETRY |
 					    __GFP_NO_KSWAPD) & ~__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);
 	bool split_pages = ion_buffer_fault_user_mappings(buffer);
 	struct ion_page_pool *pool = heap->pools[order_to_index(order)];
 	struct page *page;

 	if (!cached) {
 		page = ion_page_pool_alloc(pool);
 	} else {
 		struct scatterlist sg;
 		gfp_t gfp_flags = low_order_gfp_flags;

 		if (order > 4)
 			gfp_flags = high_order_gfp_flags;
 		page = alloc_pages(gfp_flags, order);
 		if (!page)
 			return 0;
 		sg_init_table(&sg, 1);
 		sg_set_page(&sg, page, PAGE_SIZE << order, 0);
 		dma_sync_sg_for_device(NULL, &sg, 1, DMA_BIDIRECTIONAL);
 	}
 	if (!page)
 		return 0;

 	if (split_pages)
 		split_page(page, order);
 	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;
 	unsigned long size_remaining = PAGE_ALIGN(size);
 	unsigned int max_order = orders[0];
 	bool split_pages = ion_buffer_fault_user_mappings(buffer);

 	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;

 	if (split_pages)
 		ret = sg_alloc_table(table, PAGE_ALIGN(size) / PAGE_SIZE,
 				     GFP_KERNEL);
 	else
 		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;
 		if (split_pages) {
 			for (i = 0; i < (1 << info->order); i++) {
 				sg_set_page(sg, page + i, PAGE_SIZE, 0);
 				sg = sg_next(sg);
 			}
 		} else {
 			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;
 	atomic_add(size, &system_heap_allocated);
 	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);
 	atomic_sub(buffer->size, &system_heap_allocated);
 }

 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 int ion_system_print_debug(struct ion_heap *heap, struct seq_file *s,
 				  const struct rb_root *unused)
 {
 	seq_printf(s, "total bytes currently allocated: %lx\n",
 			(unsigned long) atomic_read(&system_heap_allocated));

 	return 0;
 }

 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,
 	.print_debug = ion_system_print_debug,
 };

 struct ion_heap *ion_system_heap_create(struct ion_platform_heap *pheap)
 {
 	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;
 	}
 	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;
 	atomic_add(len, &system_contig_heap_allocated);
 	return 0;
 }

 void ion_system_contig_heap_free(struct ion_buffer *buffer)
 {
 	kfree(buffer->priv_virt);
 	atomic_sub(buffer->size, &system_contig_heap_allocated);
 }

 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));

 	if (ION_IS_CACHED(buffer->flags))
 		return remap_pfn_range(vma, vma->vm_start, pfn + vma->vm_pgoff,
 			       vma->vm_end - vma->vm_start,
 			       vma->vm_page_prot);
 	else {
 		pr_err("%s: cannot map system heap uncached\n", __func__);
 		return -EINVAL;
 	}
 }

 static int ion_system_contig_print_debug(struct ion_heap *heap,
 					 struct seq_file *s,
 					 const struct rb_root *unused)
 {
 	seq_printf(s, "total bytes currently allocated: %lx\n",
 		(unsigned long) atomic_read(&system_contig_heap_allocated));

 	return 0;
 }

 void *ion_system_contig_heap_map_kernel(struct ion_heap *heap,
 	struct ion_buffer *buffer)
 {
 	return buffer->priv_virt;
 }

 void ion_system_contig_heap_unmap_kernel(struct ion_heap *heap,
 	struct ion_buffer *buffer)
 {
 	return;
 }

 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,
 	.print_debug = ion_system_contig_print_debug,
 };

 struct ion_heap *ion_system_contig_heap_create(struct ion_platform_heap *pheap)
 {
 	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);
 }
	/*
	* drivers/gpu/ion/ion_system_heap.c
	*
	* Copyright (C) 2011 Google, Inc.
	* Copyright (c) 2011-2013, The Linux Foundation. All rights reserved.
	*
	* 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/ion.h>
	#include <linux/mm.h>
	#include <linux/scatterlist.h>
	#include <linux/seq_file.h>
	#include <linux/slab.h>
	#include <linux/vmalloc.h>
	#include <linux/seq_file.h>
	#include "ion_priv.h"
	#include <mach/memory.h>
	#include <asm/cacheflush.h>
	#include <linux/msm_ion.h>
	#include <linux/dma-mapping.h>

	static atomic_t system_heap_allocated;
	static atomic_t system_contig_heap_allocated;

	static unsigned int high_order_gfp_flags = (GFP_HIGHUSER \| __GFP_ZERO \|
	__GFP_NOWARN \| __GFP_NORETRY \|
	__GFP_NO_KSWAPD) & ~__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);
	bool split_pages = ion_buffer_fault_user_mappings(buffer);
	struct ion_page_pool *pool = heap->pools[order_to_index(order)];
	struct page *page;

	if (!cached) {
	page = ion_page_pool_alloc(pool);
	} else {
	struct scatterlist sg;
	gfp_t gfp_flags = low_order_gfp_flags;

	if (order > 4)
	gfp_flags = high_order_gfp_flags;
	page = alloc_pages(gfp_flags, order);
	if (!page)
	return 0;
	sg_init_table(&sg, 1);
	sg_set_page(&sg, page, PAGE_SIZE << order, 0);
	dma_sync_sg_for_device(NULL, &sg, 1, DMA_BIDIRECTIONAL);
	}
	if (!page)
	return 0;

	if (split_pages)
	split_page(page, order);
	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;
	unsigned long size_remaining = PAGE_ALIGN(size);
	unsigned int max_order = orders[0];
	bool split_pages = ion_buffer_fault_user_mappings(buffer);

	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;

	if (split_pages)
	ret = sg_alloc_table(table, PAGE_ALIGN(size) / PAGE_SIZE,
	GFP_KERNEL);
	else
	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;
	if (split_pages) {
	for (i = 0; i < (1 << info->order); i++) {
	sg_set_page(sg, page + i, PAGE_SIZE, 0);
	sg = sg_next(sg);
	}
	} else {
	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;
	atomic_add(size, &system_heap_allocated);
	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);
	atomic_sub(buffer->size, &system_heap_allocated);
	}

	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 int ion_system_print_debug(struct ion_heap heap, struct seq_file s,
	const struct rb_root *unused)
	{
	seq_printf(s, "total bytes currently allocated: %lx\n",
	(unsigned long) atomic_read(&system_heap_allocated));

	return 0;
	}

	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,
	.print_debug = ion_system_print_debug,
	};

	struct ion_heap ion_system_heap_create(struct ion_platform_heap pheap)
	{
	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;
	}
	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;
	atomic_add(len, &system_contig_heap_allocated);
	return 0;
	}

	void ion_system_contig_heap_free(struct ion_buffer *buffer)
	{
	kfree(buffer->priv_virt);
	atomic_sub(buffer->size, &system_contig_heap_allocated);
	}

	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));

	if (ION_IS_CACHED(buffer->flags))
	return remap_pfn_range(vma, vma->vm_start, pfn + vma->vm_pgoff,
	vma->vm_end - vma->vm_start,
	vma->vm_page_prot);
	else {
	pr_err("%s: cannot map system heap uncached\n", __func__);
	return -EINVAL;
	}
	}

	static int ion_system_contig_print_debug(struct ion_heap *heap,
	struct seq_file *s,
	const struct rb_root *unused)
	{
	seq_printf(s, "total bytes currently allocated: %lx\n",
	(unsigned long) atomic_read(&system_contig_heap_allocated));

	return 0;
	}

	void ion_system_contig_heap_map_kernel(struct ion_heap heap,
	struct ion_buffer *buffer)
	{
	return buffer->priv_virt;
	}

	void ion_system_contig_heap_unmap_kernel(struct ion_heap *heap,
	struct ion_buffer *buffer)
	{
	return;
	}

	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,
	.print_debug = ion_system_contig_print_debug,
	};

	struct ion_heap ion_system_contig_heap_create(struct ion_platform_heap pheap)
	{
	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);
	}