170 lines
4.9 KiB
C++
170 lines
4.9 KiB
C++
/*
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* Copyright (C) 2008 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <limits.h>
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#include <errno.h>
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#include <pthread.h>
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#include <unistd.h>
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#include <string.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <cutils/log.h>
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#include <cutils/atomic.h>
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#include <hardware/hardware.h>
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#include <hardware/gralloc.h>
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#include "gralloc_priv.h"
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/* desktop Linux needs a little help with gettid() */
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#if defined(ARCH_X86) && !defined(HAVE_ANDROID_OS)
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#define __KERNEL__
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# include <linux/unistd.h>
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pid_t gettid() { return syscall(__NR_gettid);}
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#undef __KERNEL__
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#endif
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/*****************************************************************************/
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static int gralloc_map(gralloc_module_t const* module,
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buffer_handle_t handle,
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void** vaddr)
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{
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private_handle_t* hnd = (private_handle_t*)handle;
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if (!(hnd->flags & private_handle_t::PRIV_FLAGS_FRAMEBUFFER)) {
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size_t size = hnd->size;
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void* mappedAddress = mmap(0, size,
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PROT_READ|PROT_WRITE, MAP_SHARED, hnd->fd, 0);
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if (mappedAddress == MAP_FAILED) {
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ALOGE("Could not mmap %s", strerror(errno));
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return -errno;
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}
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hnd->base = intptr_t(mappedAddress) + hnd->offset;
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//ALOGD("gralloc_map() succeeded fd=%d, off=%d, size=%d, vaddr=%p",
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// hnd->fd, hnd->offset, hnd->size, mappedAddress);
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}
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*vaddr = (void*)hnd->base;
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return 0;
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}
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static int gralloc_unmap(gralloc_module_t const* module,
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buffer_handle_t handle)
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{
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private_handle_t* hnd = (private_handle_t*)handle;
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if (!(hnd->flags & private_handle_t::PRIV_FLAGS_FRAMEBUFFER)) {
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void* base = (void*)hnd->base;
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size_t size = hnd->size;
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//ALOGD("unmapping from %p, size=%d", base, size);
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if (munmap(base, size) < 0) {
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ALOGE("Could not unmap %s", strerror(errno));
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}
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}
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hnd->base = 0;
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return 0;
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}
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/*****************************************************************************/
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static pthread_mutex_t sMapLock = PTHREAD_MUTEX_INITIALIZER;
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/*****************************************************************************/
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int gralloc_register_buffer(gralloc_module_t const* module,
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buffer_handle_t handle)
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{
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if (private_handle_t::validate(handle) < 0)
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return -EINVAL;
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// if this handle was created in this process, then we keep it as is.
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int err = 0;
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private_handle_t* hnd = (private_handle_t*)handle;
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if (hnd->pid != getpid()) {
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void *vaddr;
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err = gralloc_map(module, handle, &vaddr);
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}
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return err;
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}
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int gralloc_unregister_buffer(gralloc_module_t const* module,
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buffer_handle_t handle)
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{
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if (private_handle_t::validate(handle) < 0)
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return -EINVAL;
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// never unmap buffers that were created in this process
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private_handle_t* hnd = (private_handle_t*)handle;
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if (hnd->pid != getpid()) {
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if (hnd->base) {
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gralloc_unmap(module, handle);
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}
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}
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return 0;
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}
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int mapBuffer(gralloc_module_t const* module,
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private_handle_t* hnd)
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{
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void* vaddr;
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return gralloc_map(module, hnd, &vaddr);
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}
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int terminateBuffer(gralloc_module_t const* module,
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private_handle_t* hnd)
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{
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if (hnd->base) {
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// this buffer was mapped, unmap it now
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gralloc_unmap(module, hnd);
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}
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return 0;
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}
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int gralloc_lock(gralloc_module_t const* module,
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buffer_handle_t handle, int usage,
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int l, int t, int w, int h,
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void** vaddr)
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{
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// this is called when a buffer is being locked for software
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// access. in thin implementation we have nothing to do since
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// not synchronization with the h/w is needed.
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// typically this is used to wait for the h/w to finish with
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// this buffer if relevant. the data cache may need to be
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// flushed or invalidated depending on the usage bits and the
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// hardware.
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if (private_handle_t::validate(handle) < 0)
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return -EINVAL;
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private_handle_t* hnd = (private_handle_t*)handle;
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*vaddr = (void*)hnd->base;
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return 0;
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}
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int gralloc_unlock(gralloc_module_t const* module,
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buffer_handle_t handle)
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{
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// we're done with a software buffer. nothing to do in this
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// implementation. typically this is used to flush the data cache.
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if (private_handle_t::validate(handle) < 0)
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return -EINVAL;
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return 0;
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}
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