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/*
* 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/ion.h>
#include <linux/mm.h>
#include <linux/scatterlist.h>
#include <linux/slab.h>
#include <linux/vmalloc.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;
if (ion_buffer_fault_user_mappings(buffer))
return -ENOMEM;
num_chunks = ALIGN(size, chunk_heap->chunk_size) /
chunk_heap->chunk_size;
buffer->size = num_chunks * chunk_heap->chunk_size;
if (buffer->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 += buffer->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;
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 -= buffer->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 %zu 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;
}
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