gpu: ion: delete ion_system_mapper.c

/*

 * drivers/staging/android/ion/ion_system_mapper.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/memory.h>

#include <linux/mm.h>

#include <linux/slab.h>

#include <linux/vmalloc.h>

#include "ion.h"

#include "ion_priv.h"

/*

 * This mapper is valid for any heap that allocates memory that already has

 * a kernel mapping, this includes vmalloc'd memory, kmalloc'd memory,

 * pages obtained via io_remap, etc.

 */

static void *ion_kernel_mapper_map(struct ion_mapper *mapper,

				   struct ion_buffer *buffer,

				   struct ion_mapping **mapping)

{

	if (!((1 << buffer->heap->type) & mapper->heap_mask)) {

		pr_err("%s: attempting to map an unsupported heap\n", __func__);

		return ERR_PTR(-EINVAL);

	}

	/* XXX REVISIT ME!!! */

	*((unsigned long *)mapping) = (unsigned long)buffer->priv;

	return buffer->priv;

}

static void ion_kernel_mapper_unmap(struct ion_mapper *mapper,

				    struct ion_buffer *buffer,

				    struct ion_mapping *mapping)

{

	if (!((1 << buffer->heap->type) & mapper->heap_mask))

		pr_err("%s: attempting to unmap an unsupported heap\n",

		       __func__);

}

static void *ion_kernel_mapper_map_kernel(struct ion_mapper *mapper,

					struct ion_buffer *buffer,

					struct ion_mapping *mapping)

{

	if (!((1 << buffer->heap->type) & mapper->heap_mask)) {

		pr_err("%s: attempting to unmap an unsupported heap\n",

		       __func__);

		return ERR_PTR(-EINVAL);

	}

	return buffer->priv;

}

static int ion_kernel_mapper_map_user(struct ion_mapper *mapper,

				      struct ion_buffer *buffer,

				      struct vm_area_struct *vma,

				      struct ion_mapping *mapping)

{

	int ret;

	switch (buffer->heap->type) {

	case ION_HEAP_KMALLOC:

	{

		unsigned long pfn = __phys_to_pfn(virt_to_phys(buffer->priv));

		ret = remap_pfn_range(vma, vma->vm_start, pfn + vma->vm_pgoff,

				      vma->vm_end - vma->vm_start,

				      vma->vm_page_prot);

		break;

	}

	case ION_HEAP_VMALLOC:

		ret = remap_vmalloc_range(vma, buffer->priv, vma->vm_pgoff);

		break;

	default:

		pr_err("%s: attempting to map unsupported heap to userspace\n",

		       __func__);

		return -EINVAL;

	}

	return ret;

}

static struct ion_mapper_ops ops = {

	.map = ion_kernel_mapper_map,

	.map_kernel = ion_kernel_mapper_map_kernel,

	.map_user = ion_kernel_mapper_map_user,

	.unmap = ion_kernel_mapper_unmap,

};

struct ion_mapper *ion_system_mapper_create(void)

{

	struct ion_mapper *mapper;

	mapper = kzalloc(sizeof(struct ion_mapper), GFP_KERNEL);

	if (!mapper)

		return ERR_PTR(-ENOMEM);

	mapper->type = ION_SYSTEM_MAPPER;

	mapper->ops = &ops;

	mapper->heap_mask = (1 << ION_HEAP_VMALLOC) | (1 << ION_HEAP_KMALLOC);

	return mapper;

}

void ion_system_mapper_destroy(struct ion_mapper *mapper)

{

	kfree(mapper);

}