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/*
* Copyright (C) 2013 ARM Limited. All rights reserved.
*
* Copyright (C) 2008 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* You may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <errno.h>
#include <pthread.h>
#include <cutils/log.h>
#include <cutils/atomic.h>
#include <hardware/hardware.h>
#include <hardware/gralloc.h>
#include "gralloc_priv.h"
#include "alloc_device.h"
#include "framebuffer_device.h"
#include <linux/ion.h>
#include <ion/ion.h>
#include <sys/mman.h>
int gralloc_backend_register(private_handle_t* hnd)
{
int retval = -EINVAL;
switch (hnd->flags & (private_handle_t::PRIV_FLAGS_USES_UMP |
private_handle_t::PRIV_FLAGS_USES_ION))
{
case private_handle_t::PRIV_FLAGS_USES_UMP:
AERR("Gralloc does not support UMP. Unable to register UMP memory for handle %p", hnd );
break;
case private_handle_t::PRIV_FLAGS_USES_ION:
unsigned char *mappedAddress;
size_t size = hnd->size;
hw_module_t * pmodule = NULL;
private_module_t *m=NULL;
if (hw_get_module(GRALLOC_HARDWARE_MODULE_ID, (const hw_module_t **)&pmodule) == 0)
{
m = reinterpret_cast<private_module_t *>(pmodule);
}
else
{
AERR("Could not get gralloc module for handle: %p", hnd);
retval = -errno;
break;
}
/* the test condition is set to m->ion_client <= 0 here, because:
* 1) module structure are initialized to 0 if no initial value is applied
* 2) a second user process should get a ion fd greater than 0.
*/
if (m->ion_client <= 0)
{
/* a second user process must obtain a client handle first via ion_open before it can obtain the shared ion buffer*/
m->ion_client = ion_open();
if (m->ion_client < 0)
{
AERR( "Could not open ion device for handle: %p", hnd );
retval = -errno;
break;
}
}
mappedAddress = (unsigned char*)mmap( NULL, size, PROT_READ | PROT_WRITE,
MAP_SHARED, hnd->share_fd, 0 );
if ( MAP_FAILED == mappedAddress )
{
AERR( "mmap( share_fd:%d ) failed with %s", hnd->share_fd, strerror( errno ) );
retval = -errno;
break;
}
hnd->base = (void*)(uintptr_t(mappedAddress) + hnd->offset);
retval = 0;
break;
}
return retval;
}
void gralloc_backend_unregister(private_handle_t* hnd)
{
switch (hnd->flags & (private_handle_t::PRIV_FLAGS_USES_UMP |
private_handle_t::PRIV_FLAGS_USES_ION))
{
case private_handle_t::PRIV_FLAGS_USES_UMP:
AERR( "Can't unregister UMP buffer for handle %p. Not supported", hnd );
break;
case private_handle_t::PRIV_FLAGS_USES_ION:
void* base = (void*)hnd->base;
size_t size = hnd->size;
if ( munmap( base,size ) < 0 )
{
AERR("Could not munmap base:%p size:%zd '%s'", base, size, strerror(errno));
}
break;
}
}
void gralloc_backend_sync(private_handle_t* hnd)
{
switch (hnd->flags & (private_handle_t::PRIV_FLAGS_USES_UMP |
private_handle_t::PRIV_FLAGS_USES_ION))
{
case private_handle_t::PRIV_FLAGS_USES_UMP:
AERR( "Buffer %p is UMP type but it is not supported", hnd );
break;
case private_handle_t::PRIV_FLAGS_USES_ION:
hw_module_t * pmodule = NULL;
private_module_t *m=NULL;
if (hw_get_module(GRALLOC_HARDWARE_MODULE_ID, (const hw_module_t **)&pmodule) == 0)
{
m = reinterpret_cast<private_module_t *>(pmodule);
ion_sync_fd(m->ion_client, hnd->share_fd);
}
else
{
AERR("Could not get gralloc module for handle %p\n", hnd);
}
break;
}
}
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