240 lines
7.4 KiB
C++
240 lines
7.4 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 <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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// we need this for now because pmem cannot mmap at an offset
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#define PMEM_HACK 1
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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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#if PMEM_HACK
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size += hnd->offset;
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#endif
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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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LOGE("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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//LOGD("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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if (munmap((void*)hnd->base, hnd->size) < 0) {
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LOGE("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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// In this implementation, we don't need to do anything here
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/* NOTE: we need to initialize the buffer as not mapped/not locked
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* because it shouldn't when this function is called the first time
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* in a new process. Ideally these flags shouldn't be part of the
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* handle, but instead maintained in the kernel or at least
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* out-of-line
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*/
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// if this handle was created in this process, then we keep it as is.
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private_handle_t* hnd = (private_handle_t*)handle;
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if (hnd->pid != getpid()) {
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hnd->base = 0;
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hnd->lockState = 0;
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hnd->writeOwner = 0;
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}
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return 0;
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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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/*
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* If the buffer has been mapped during a lock operation, it's time
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* to un-map it. It's an error to be here with a locked buffer.
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* NOTE: the framebuffer is handled differently and is never unmapped.
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*/
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private_handle_t* hnd = (private_handle_t*)handle;
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LOGE_IF(hnd->lockState & private_handle_t::LOCK_STATE_READ_MASK,
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"handle %p still locked (state=%08x)",
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hnd, hnd->lockState);
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// never unmap buffers that were created in this process
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if (hnd->pid != getpid()) {
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if (hnd->lockState & private_handle_t::LOCK_STATE_MAPPED) {
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gralloc_unmap(module, handle);
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}
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hnd->base = 0;
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hnd->lockState = 0;
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hnd->writeOwner = 0;
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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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if (private_handle_t::validate(handle) < 0)
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return -EINVAL;
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int err = 0;
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private_handle_t* hnd = (private_handle_t*)handle;
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int32_t current_value, new_value;
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int retry;
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do {
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current_value = hnd->lockState;
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new_value = current_value;
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if (current_value & private_handle_t::LOCK_STATE_WRITE) {
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// already locked for write
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LOGE("handle %p already locked for write", handle);
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return -EBUSY;
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} else if (current_value & private_handle_t::LOCK_STATE_READ_MASK) {
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// already locked for read
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if (usage & (GRALLOC_USAGE_SW_WRITE_MASK | GRALLOC_USAGE_HW_RENDER)) {
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LOGE("handle %p already locked for read", handle);
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return -EBUSY;
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} else {
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// this is not an error
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//LOGD("%p already locked for read... count = %d",
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// handle, (current_value & ~(1<<31)));
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}
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}
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// not currently locked
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if (usage & (GRALLOC_USAGE_SW_WRITE_MASK | GRALLOC_USAGE_HW_RENDER)) {
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// locking for write
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new_value |= private_handle_t::LOCK_STATE_WRITE;
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}
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new_value++;
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retry = android_atomic_cmpxchg(current_value, new_value,
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(volatile int32_t*)&hnd->lockState);
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} while (retry);
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if (new_value & private_handle_t::LOCK_STATE_WRITE) {
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// locking for write, store the tid
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hnd->writeOwner = gettid();
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}
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if (usage & (GRALLOC_USAGE_SW_READ_MASK | GRALLOC_USAGE_SW_WRITE_MASK)) {
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if (!(current_value & private_handle_t::LOCK_STATE_MAPPED)) {
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// we need to map for real
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pthread_mutex_t* const lock = &sMapLock;
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pthread_mutex_lock(lock);
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if (!(hnd->lockState & private_handle_t::LOCK_STATE_MAPPED)) {
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err = gralloc_map(module, handle, vaddr);
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if (err == 0) {
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android_atomic_or(private_handle_t::LOCK_STATE_MAPPED,
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(volatile int32_t*)&(hnd->lockState));
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}
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}
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pthread_mutex_unlock(lock);
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}
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*vaddr = (void*)hnd->base;
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}
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return err;
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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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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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int32_t current_value, new_value;
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do {
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current_value = hnd->lockState;
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new_value = current_value;
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if (current_value & private_handle_t::LOCK_STATE_WRITE) {
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// locked for write
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if (hnd->writeOwner == gettid()) {
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hnd->writeOwner = 0;
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new_value &= ~private_handle_t::LOCK_STATE_WRITE;
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}
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}
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if ((new_value & private_handle_t::LOCK_STATE_READ_MASK) == 0) {
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LOGE("handle %p not locked", handle);
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return -EINVAL;
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}
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new_value--;
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} while (android_atomic_cmpxchg(current_value, new_value,
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(volatile int32_t*)&hnd->lockState));
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return 0;
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}
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