166 lines
4.1 KiB
C
166 lines
4.1 KiB
C
/*
|
|
* drivers/staging/android/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;
|
|
};
|
|
|
|
|
|
/* 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);
|
|
|
|
if (buffer->flags & ION_FLAG_CACHED)
|
|
return -EINVAL;
|
|
|
|
if (align > PAGE_SIZE)
|
|
return -EINVAL;
|
|
|
|
info = kzalloc(sizeof(struct ion_cma_buffer_info), GFP_KERNEL);
|
|
if (!info)
|
|
return ION_CMA_ALLOCATE_FAILED;
|
|
|
|
info->cpu_addr = dma_alloc_coherent(dev, len, &(info->handle),
|
|
GFP_HIGHUSER | __GFP_ZERO);
|
|
|
|
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)
|
|
goto free_mem;
|
|
|
|
if (dma_get_sgtable(dev, info->table, info->cpu_addr, info->handle,
|
|
len))
|
|
goto free_table;
|
|
/* keep this for memory release */
|
|
buffer->priv_virt = info;
|
|
buffer->sg_table = info->table;
|
|
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);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
static 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 void ion_cma_unmap_kernel(struct ion_heap *heap,
|
|
struct ion_buffer *buffer)
|
|
{
|
|
}
|
|
|
|
static struct ion_heap_ops ion_cma_ops = {
|
|
.allocate = ion_cma_allocate,
|
|
.free = ion_cma_free,
|
|
.map_user = ion_cma_mmap,
|
|
.map_kernel = ion_cma_map_kernel,
|
|
.unmap_kernel = ion_cma_unmap_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);
|
|
}
|