115 lines
3.1 KiB
C
115 lines
3.1 KiB
C
/*
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* drivers/gpu/ion/ion_system_mapper.c
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*
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* Copyright (C) 2011 Google, Inc.
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/err.h>
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#include <linux/ion.h>
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#include <linux/memory.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include "ion_priv.h"
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/*
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* This mapper is valid for any heap that allocates memory that already has
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* a kernel mapping, this includes vmalloc'd memory, kmalloc'd memory,
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* pages obtained via io_remap, etc.
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*/
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static void *ion_kernel_mapper_map(struct ion_mapper *mapper,
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struct ion_buffer *buffer,
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struct ion_mapping **mapping)
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{
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if (!((1 << buffer->heap->type) & mapper->heap_mask)) {
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pr_err("%s: attempting to map an unsupported heap\n", __func__);
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return ERR_PTR(-EINVAL);
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}
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/* XXX REVISIT ME!!! */
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*((unsigned long *)mapping) = (unsigned long)buffer->priv;
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return buffer->priv;
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}
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static void ion_kernel_mapper_unmap(struct ion_mapper *mapper,
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struct ion_buffer *buffer,
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struct ion_mapping *mapping)
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{
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if (!((1 << buffer->heap->type) & mapper->heap_mask))
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pr_err("%s: attempting to unmap an unsupported heap\n",
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__func__);
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}
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static void *ion_kernel_mapper_map_kernel(struct ion_mapper *mapper,
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struct ion_buffer *buffer,
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struct ion_mapping *mapping)
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{
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if (!((1 << buffer->heap->type) & mapper->heap_mask)) {
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pr_err("%s: attempting to unmap an unsupported heap\n",
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__func__);
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return ERR_PTR(-EINVAL);
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}
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return buffer->priv;
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}
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static int ion_kernel_mapper_map_user(struct ion_mapper *mapper,
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struct ion_buffer *buffer,
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struct vm_area_struct *vma,
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struct ion_mapping *mapping)
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{
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int ret;
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switch (buffer->heap->type) {
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case ION_HEAP_KMALLOC:
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{
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unsigned long pfn = __phys_to_pfn(virt_to_phys(buffer->priv));
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ret = remap_pfn_range(vma, vma->vm_start, pfn + vma->vm_pgoff,
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vma->vm_end - vma->vm_start,
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vma->vm_page_prot);
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break;
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}
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case ION_HEAP_VMALLOC:
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ret = remap_vmalloc_range(vma, buffer->priv, vma->vm_pgoff);
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break;
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default:
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pr_err("%s: attempting to map unsupported heap to userspace\n",
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__func__);
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return -EINVAL;
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}
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return ret;
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}
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static struct ion_mapper_ops ops = {
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.map = ion_kernel_mapper_map,
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.map_kernel = ion_kernel_mapper_map_kernel,
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.map_user = ion_kernel_mapper_map_user,
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.unmap = ion_kernel_mapper_unmap,
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};
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struct ion_mapper *ion_system_mapper_create(void)
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{
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struct ion_mapper *mapper;
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mapper = kzalloc(sizeof(struct ion_mapper), GFP_KERNEL);
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if (!mapper)
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return ERR_PTR(-ENOMEM);
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mapper->type = ION_SYSTEM_MAPPER;
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mapper->ops = &ops;
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mapper->heap_mask = (1 << ION_HEAP_VMALLOC) | (1 << ION_HEAP_KMALLOC);
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return mapper;
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}
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void ion_system_mapper_destroy(struct ion_mapper *mapper)
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{
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kfree(mapper);
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}
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