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/*
* drivers/gpu/ion/ion_carveout_heap.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/spinlock.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>
#include <asm/cacheflush.h>
struct ion_carveout_heap {
struct ion_heap heap;
struct gen_pool *pool;
ion_phys_addr_t base;
};
ion_phys_addr_t ion_carveout_allocate(struct ion_heap *heap,
unsigned long size,
unsigned long align)
{
struct ion_carveout_heap *carveout_heap =
container_of(heap, struct ion_carveout_heap, heap);
unsigned long offset = gen_pool_alloc(carveout_heap->pool, size);
if (!offset)
return ION_CARVEOUT_ALLOCATE_FAIL;
return offset;
}
void ion_carveout_free(struct ion_heap *heap, ion_phys_addr_t addr,
unsigned long size)
{
struct ion_carveout_heap *carveout_heap =
container_of(heap, struct ion_carveout_heap, heap);
if (addr == ION_CARVEOUT_ALLOCATE_FAIL)
return;
gen_pool_free(carveout_heap->pool, addr, size);
}
static int ion_carveout_heap_phys(struct ion_heap *heap,
struct ion_buffer *buffer,
ion_phys_addr_t *addr, size_t *len)
{
*addr = buffer->priv_phys;
*len = buffer->size;
return 0;
}
static int ion_carveout_heap_allocate(struct ion_heap *heap,
struct ion_buffer *buffer,
unsigned long size, unsigned long align,
unsigned long flags)
{
buffer->priv_phys = ion_carveout_allocate(heap, size, align);
return buffer->priv_phys == ION_CARVEOUT_ALLOCATE_FAIL ? -ENOMEM : 0;
}
static void ion_carveout_heap_free(struct ion_buffer *buffer)
{
struct ion_heap *heap = buffer->heap;
ion_carveout_free(heap, buffer->priv_phys, buffer->size);
buffer->priv_phys = ION_CARVEOUT_ALLOCATE_FAIL;
}
struct scatterlist *ion_carveout_heap_map_dma(struct ion_heap *heap,
struct ion_buffer *buffer)
{
return ERR_PTR(-EINVAL);
}
void ion_carveout_heap_unmap_dma(struct ion_heap *heap,
struct ion_buffer *buffer)
{
return;
}
void *ion_carveout_heap_map_kernel(struct ion_heap *heap,
struct ion_buffer *buffer)
{
return __arch_ioremap(buffer->priv_phys, buffer->size,
MT_MEMORY_NONCACHED);
}
void ion_carveout_heap_unmap_kernel(struct ion_heap *heap,
struct ion_buffer *buffer)
{
__arch_iounmap(buffer->vaddr);
buffer->vaddr = NULL;
return;
}
int ion_carveout_heap_map_user(struct ion_heap *heap, struct ion_buffer *buffer,
struct vm_area_struct *vma)
{
return remap_pfn_range(vma, vma->vm_start,
__phys_to_pfn(buffer->priv_phys) + vma->vm_pgoff,
buffer->size,
(buffer->cached ? (vma->vm_page_prot)
: pgprot_writecombine(vma->vm_page_prot)));
}
static void per_cpu_cache_flush_arm(void *arg)
{
flush_cache_all();
}
int ion_carveout_heap_cache_operation(struct ion_buffer *buffer, size_t len,
unsigned long vaddr, enum cache_operation cacheop)
{
if (!buffer || !buffer->cached) {
pr_err("%s(): buffer not mapped as cacheable\n",
__func__);
return -EINVAL;
}
if (len > FULL_CACHE_FLUSH_THRESHOLD) {
on_each_cpu(per_cpu_cache_flush_arm, NULL, 1);
outer_flush_all();
return 0;
}
flush_cache_user_range(vaddr, (vaddr+len));
if (cacheop == CACHE_FLUSH)
outer_flush_range(buffer->priv_phys, buffer->priv_phys+len);
else
outer_inv_range(buffer->priv_phys, buffer->priv_phys+len);
return 0;
}
int ion_carveout_heap_flush_user(struct ion_buffer *buffer, size_t len,
unsigned long vaddr)
{
return ion_carveout_heap_cache_operation(buffer, len,
vaddr, CACHE_FLUSH);
}
int ion_carveout_heap_inval_user(struct ion_buffer *buffer, size_t len,
unsigned long vaddr)
{
return ion_carveout_heap_cache_operation(buffer, len,
vaddr, CACHE_INVALIDATE);
}
static struct ion_heap_ops carveout_heap_ops = {
.allocate = ion_carveout_heap_allocate,
.free = ion_carveout_heap_free,
.phys = ion_carveout_heap_phys,
.map_user = ion_carveout_heap_map_user,
.flush_user = ion_carveout_heap_flush_user,
.inval_user = ion_carveout_heap_inval_user,
.map_kernel = ion_carveout_heap_map_kernel,
.unmap_kernel = ion_carveout_heap_unmap_kernel,
};
struct ion_heap *ion_carveout_heap_create(struct ion_platform_heap *heap_data)
{
struct ion_carveout_heap *carveout_heap;
carveout_heap = kzalloc(sizeof(struct ion_carveout_heap), GFP_KERNEL);
if (!carveout_heap)
return ERR_PTR(-ENOMEM);
carveout_heap->pool = gen_pool_create(12, -1);
if (!carveout_heap->pool) {
kfree(carveout_heap);
return ERR_PTR(-ENOMEM);
}
carveout_heap->base = heap_data->base;
gen_pool_add(carveout_heap->pool, carveout_heap->base, heap_data->size,
-1);
carveout_heap->heap.ops = &carveout_heap_ops;
carveout_heap->heap.type = ION_HEAP_TYPE_CARVEOUT;
return &carveout_heap->heap;
}
void ion_carveout_heap_destroy(struct ion_heap *heap)
{
struct ion_carveout_heap *carveout_heap =
container_of(heap, struct ion_carveout_heap, heap);
gen_pool_destroy(carveout_heap->pool);
kfree(carveout_heap);
carveout_heap = NULL;
}
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