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#include <poll.h>
#include <sys/epoll.h>
#include <pdx/default_transport/client_channel.h>
#include <pdx/default_transport/client_channel_factory.h>
#include <private/dvr/buffer_hub_base.h>
using android::pdx::LocalChannelHandle;
using android::pdx::LocalHandle;
using android::pdx::Status;
using android::pdx::default_transport::ClientChannel;
using android::pdx::default_transport::ClientChannelFactory;
namespace android {
namespace dvr {
BufferHubBase::BufferHubBase(LocalChannelHandle channel_handle)
: Client{pdx::default_transport::ClientChannel::Create(
std::move(channel_handle))},
id_(-1),
cid_(-1) {}
BufferHubBase::BufferHubBase(const std::string& endpoint_path)
: Client{pdx::default_transport::ClientChannelFactory::Create(
endpoint_path)},
id_(-1),
cid_(-1) {}
BufferHubBase::~BufferHubBase() {
// buffer_state and fence_state are not reset here. They will be used to
// clean up epoll fd if necessary in ProducerChannel::RemoveConsumer method.
if (metadata_header_ != nullptr) {
metadata_buffer_.Unlock();
}
}
Status<LocalChannelHandle> BufferHubBase::CreateConsumer() {
Status<LocalChannelHandle> status =
InvokeRemoteMethod<BufferHubRPC::NewConsumer>();
ALOGE_IF(!status,
"BufferHub::CreateConsumer: Failed to create consumer channel: %s",
status.GetErrorMessage().c_str());
return status;
}
int BufferHubBase::ImportBuffer() {
ATRACE_NAME("BufferHubBase::ImportBuffer");
Status<BufferDescription<LocalHandle>> status =
InvokeRemoteMethod<BufferHubRPC::GetBuffer>();
if (!status) {
ALOGE("BufferHubBase::ImportBuffer: Failed to get buffer: %s",
status.GetErrorMessage().c_str());
return -status.error();
} else if (status.get().id() < 0) {
ALOGE("BufferHubBase::ImportBuffer: Received an invalid id!");
return -EIO;
}
auto buffer_desc = status.take();
// Stash the buffer id to replace the value in id_.
const int new_id = buffer_desc.id();
// Import the buffer.
IonBuffer ion_buffer;
ALOGD_IF(TRACE, "BufferHubBase::ImportBuffer: id=%d.", buffer_desc.id());
if (const int ret = buffer_desc.ImportBuffer(&ion_buffer))
return ret;
// Import the metadata.
IonBuffer metadata_buffer;
if (const int ret = buffer_desc.ImportMetadata(&metadata_buffer)) {
ALOGE("Failed to import metadata buffer, error=%d", ret);
return ret;
}
size_t metadata_buf_size = metadata_buffer.width();
if (metadata_buf_size < BufferHubDefs::kMetadataHeaderSize) {
ALOGE("BufferHubBase::ImportBuffer: metadata buffer too small: %zu",
metadata_buf_size);
return -ENOMEM;
}
// If all imports succee, replace the previous buffer and id.
buffer_ = std::move(ion_buffer);
metadata_buffer_ = std::move(metadata_buffer);
metadata_buf_size_ = metadata_buf_size;
user_metadata_size_ = metadata_buf_size_ - BufferHubDefs::kMetadataHeaderSize;
void* metadata_ptr = nullptr;
if (const int ret =
metadata_buffer_.Lock(BufferHubDefs::kMetadataUsage, /*x=*/0,
/*y=*/0, metadata_buf_size_,
/*height=*/1, &metadata_ptr)) {
ALOGE("BufferHubBase::ImportBuffer: Failed to lock metadata.");
return ret;
}
// Set up shared fences.
shared_acquire_fence_ = buffer_desc.take_acquire_fence();
shared_release_fence_ = buffer_desc.take_release_fence();
if (!shared_acquire_fence_ || !shared_release_fence_) {
ALOGE("BufferHubBase::ImportBuffer: Failed to import shared fences.");
return -EIO;
}
metadata_header_ =
reinterpret_cast<BufferHubDefs::MetadataHeader*>(metadata_ptr);
if (user_metadata_size_) {
user_metadata_ptr_ =
reinterpret_cast<void*>(reinterpret_cast<uintptr_t>(metadata_ptr) +
BufferHubDefs::kMetadataHeaderSize);
} else {
user_metadata_ptr_ = nullptr;
}
id_ = new_id;
cid_ = buffer_desc.buffer_cid();
client_state_mask_ = buffer_desc.client_state_mask();
// Note that here the buffer_state, fence_state and active_clients_bit_mask
// are mapped from shared memory as an atomic object. The std::atomic's
// constructor will not be called so that the original value stored in the
// memory region will be preserved.
buffer_state_ = &metadata_header_->bufferState;
ALOGD_IF(TRACE,
"BufferHubBase::ImportBuffer: id=%d, buffer_state=%" PRIx32 ".",
id(), buffer_state_->load(std::memory_order_acquire));
fence_state_ = &metadata_header_->fenceState;
ALOGD_IF(TRACE,
"BufferHubBase::ImportBuffer: id=%d, fence_state=%" PRIx32 ".", id(),
fence_state_->load(std::memory_order_acquire));
active_clients_bit_mask_ = &metadata_header_->activeClientsBitMask;
ALOGD_IF(
TRACE,
"BufferHubBase::ImportBuffer: id=%d, active_clients_bit_mask=%" PRIx32
".",
id(), active_clients_bit_mask_->load(std::memory_order_acquire));
return 0;
}
int BufferHubBase::CheckMetadata(size_t user_metadata_size) const {
if (user_metadata_size && !user_metadata_ptr_) {
ALOGE("BufferHubBase::CheckMetadata: doesn't support custom metadata.");
return -EINVAL;
}
if (user_metadata_size > user_metadata_size_) {
ALOGE("BufferHubBase::CheckMetadata: too big: %zu, maximum: %zu.",
user_metadata_size, user_metadata_size_);
return -E2BIG;
}
return 0;
}
int BufferHubBase::UpdateSharedFence(const LocalHandle& new_fence,
const LocalHandle& shared_fence) {
if (pending_fence_fd_.Get() != new_fence.Get()) {
// First, replace the old fd if there was already one. Skipping if the new
// one is the same as the old.
if (pending_fence_fd_.IsValid()) {
const int ret = epoll_ctl(shared_fence.Get(), EPOLL_CTL_DEL,
pending_fence_fd_.Get(), nullptr);
ALOGW_IF(ret,
"BufferHubBase::UpdateSharedFence: failed to remove old fence "
"fd from epoll set, error: %s.",
strerror(errno));
}
if (new_fence.IsValid()) {
// If ready fence is valid, we put that into the epoll set.
epoll_event event;
event.events = EPOLLIN;
event.data.u32 = client_state_mask();
pending_fence_fd_ = new_fence.Duplicate();
if (epoll_ctl(shared_fence.Get(), EPOLL_CTL_ADD, pending_fence_fd_.Get(),
&event) < 0) {
const int error = errno;
ALOGE(
"BufferHubBase::UpdateSharedFence: failed to add new fence fd "
"into epoll set, error: %s.",
strerror(error));
return -error;
}
// Set bit in fence state to indicate that there is a fence from this
// producer or consumer.
fence_state_->fetch_or(client_state_mask());
} else {
// Unset bit in fence state to indicate that there is no fence, so that
// when consumer to acquire or producer to acquire, it knows no need to
// check fence for this buffer.
fence_state_->fetch_and(~client_state_mask());
}
}
return 0;
}
int BufferHubBase::Lock(int usage, int x, int y, int width, int height,
void** address) {
return buffer_.Lock(usage, x, y, width, height, address);
}
int BufferHubBase::Unlock() { return buffer_.Unlock(); }
int BufferHubBase::GetBlobReadWritePointer(size_t size, void** addr) {
int width = static_cast<int>(size);
int height = 1;
int ret = Lock(usage(), 0, 0, width, height, addr);
if (ret == 0)
Unlock();
return ret;
}
} // namespace dvr
} // namespace android
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