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-rw-r--r--services/bufferhub/Android.bp1
-rw-r--r--services/bufferhub/BufferHubService.cpp2
-rw-r--r--services/bufferhub/BufferNode.cpp15
-rw-r--r--services/bufferhub/UniqueIdGenerator.cpp55
-rw-r--r--services/bufferhub/include/bufferhub/BufferHubService.h3
-rw-r--r--services/bufferhub/include/bufferhub/BufferNode.h11
-rw-r--r--services/bufferhub/include/bufferhub/UniqueIdGenerator.h57
-rw-r--r--services/bufferhub/tests/Android.bp16
-rw-r--r--services/bufferhub/tests/UniqueIdGenerator_test.cpp45
9 files changed, 201 insertions, 4 deletions
diff --git a/services/bufferhub/Android.bp b/services/bufferhub/Android.bp
index 8b4333342d..28a7501e0a 100644
--- a/services/bufferhub/Android.bp
+++ b/services/bufferhub/Android.bp
@@ -25,6 +25,7 @@ cc_library_shared {
"BufferClient.cpp",
"BufferHubService.cpp",
"BufferNode.cpp",
+ "UniqueIdGenerator.cpp",
],
header_libs: [
"libbufferhub_headers",
diff --git a/services/bufferhub/BufferHubService.cpp b/services/bufferhub/BufferHubService.cpp
index 3bfd9cbe7e..fc5ad1dbbf 100644
--- a/services/bufferhub/BufferHubService.cpp
+++ b/services/bufferhub/BufferHubService.cpp
@@ -35,7 +35,7 @@ Return<void> BufferHubService::allocateBuffer(const HardwareBufferDescription& d
std::shared_ptr<BufferNode> node =
std::make_shared<BufferNode>(desc.width, desc.height, desc.layers, desc.format,
- desc.usage, userMetadataSize);
+ desc.usage, userMetadataSize, nodeIdGenerator.getId());
if (node == nullptr || !node->IsValid()) {
ALOGE("%s: creating BufferNode failed.", __FUNCTION__);
_hidl_cb(/*bufferClient=*/nullptr, /*status=*/BufferHubStatus::ALLOCATION_FAILED);
diff --git a/services/bufferhub/BufferNode.cpp b/services/bufferhub/BufferNode.cpp
index 53dd702792..715d0a1f67 100644
--- a/services/bufferhub/BufferNode.cpp
+++ b/services/bufferhub/BufferNode.cpp
@@ -1,5 +1,6 @@
#include <errno.h>
+#include <bufferhub/BufferHubService.h>
#include <bufferhub/BufferNode.h>
#include <private/dvr/buffer_hub_defs.h>
#include <ui/GraphicBufferAllocator.h>
@@ -22,7 +23,8 @@ void BufferNode::InitializeMetadata() {
// Allocates a new BufferNode.
BufferNode::BufferNode(uint32_t width, uint32_t height, uint32_t layer_count, uint32_t format,
- uint64_t usage, size_t user_metadata_size) {
+ uint64_t usage, size_t user_metadata_size, uint32_t id)
+ : mId(id) {
uint32_t out_stride = 0;
// graphicBufferId is not used in GraphicBufferAllocator::allocate
// TODO(b/112338294) After move to the service folder, stop using the
@@ -54,14 +56,23 @@ BufferNode::BufferNode(uint32_t width, uint32_t height, uint32_t layer_count, ui
InitializeMetadata();
}
-// Free the handle
BufferNode::~BufferNode() {
+ // Free the handle
if (buffer_handle_ != nullptr) {
status_t ret = GraphicBufferAllocator::get().free(buffer_handle_);
if (ret != OK) {
ALOGE("%s: Failed to free handle; Got error: %d", __FUNCTION__, ret);
}
}
+
+ // Free the id, if valid
+ if (id() != UniqueIdGenerator::kInvalidId) {
+ if (nodeIdGenerator.freeId(id())) {
+ ALOGI("%s: id #%u is freed.", __FUNCTION__, id());
+ } else {
+ ALOGE("%s: Cannot free nonexistent id #%u", __FUNCTION__, id());
+ }
+ }
}
uint64_t BufferNode::GetActiveClientsBitMask() const {
diff --git a/services/bufferhub/UniqueIdGenerator.cpp b/services/bufferhub/UniqueIdGenerator.cpp
new file mode 100644
index 0000000000..362a026f6c
--- /dev/null
+++ b/services/bufferhub/UniqueIdGenerator.cpp
@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) 2018 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 <bufferhub/UniqueIdGenerator.h>
+
+namespace android {
+namespace frameworks {
+namespace bufferhub {
+namespace V1_0 {
+namespace implementation {
+
+constexpr uint32_t UniqueIdGenerator::kInvalidId;
+
+uint32_t UniqueIdGenerator::getId() {
+ std::lock_guard<std::mutex> lock(mIdsInUseMutex);
+
+ do {
+ if (++mLastId >= std::numeric_limits<uint32_t>::max()) {
+ mLastId = kInvalidId + 1;
+ }
+ } while (mIdsInUse.find(mLastId) != mIdsInUse.end());
+
+ mIdsInUse.insert(mLastId);
+ return mLastId;
+}
+
+bool UniqueIdGenerator::freeId(uint32_t id) {
+ std::lock_guard<std::mutex> lock(mIdsInUseMutex);
+ auto iter = mIdsInUse.find(id);
+ if (iter != mIdsInUse.end()) {
+ mIdsInUse.erase(iter);
+ return true;
+ }
+
+ return false;
+}
+
+} // namespace implementation
+} // namespace V1_0
+} // namespace bufferhub
+} // namespace frameworks
+} // namespace android
diff --git a/services/bufferhub/include/bufferhub/BufferHubService.h b/services/bufferhub/include/bufferhub/BufferHubService.h
index dbbee8fccf..5441750e9a 100644
--- a/services/bufferhub/include/bufferhub/BufferHubService.h
+++ b/services/bufferhub/include/bufferhub/BufferHubService.h
@@ -22,6 +22,7 @@
#include <android/frameworks/bufferhub/1.0/IBufferHub.h>
#include <bufferhub/BufferClient.h>
+#include <bufferhub/UniqueIdGenerator.h>
#include <utils/Mutex.h>
namespace android {
@@ -34,6 +35,8 @@ using hardware::hidl_handle;
using hardware::Return;
using hardware::graphics::common::V1_2::HardwareBufferDescription;
+static UniqueIdGenerator nodeIdGenerator;
+
class BufferHubService : public IBufferHub {
public:
Return<void> allocateBuffer(const HardwareBufferDescription& description,
diff --git a/services/bufferhub/include/bufferhub/BufferNode.h b/services/bufferhub/include/bufferhub/BufferNode.h
index ffeacaccc3..c490e7c709 100644
--- a/services/bufferhub/include/bufferhub/BufferNode.h
+++ b/services/bufferhub/include/bufferhub/BufferNode.h
@@ -2,6 +2,7 @@
#define ANDROID_FRAMEWORKS_BUFFERHUB_V1_0_BUFFER_NODE_H_
#include <android/hardware_buffer.h>
+#include <bufferhub/UniqueIdGenerator.h>
#include <ui/BufferHubMetadata.h>
namespace android {
@@ -14,13 +15,16 @@ class BufferNode {
public:
// Allocates a new BufferNode.
BufferNode(uint32_t width, uint32_t height, uint32_t layer_count, uint32_t format,
- uint64_t usage, size_t user_metadata_size);
+ uint64_t usage, size_t user_metadata_size,
+ uint32_t id = UniqueIdGenerator::kInvalidId);
~BufferNode();
// Returns whether the object holds a valid metadata.
bool IsValid() const { return metadata_.IsValid(); }
+ uint32_t id() const { return mId; }
+
size_t user_metadata_size() const { return metadata_.user_metadata_size(); }
// Accessors of the buffer description and handle
@@ -59,6 +63,11 @@ private:
// Metadata in shared memory.
BufferHubMetadata metadata_;
+ // A system-unique id generated by bufferhub from 1 to std::numeric_limits<uint32_t>::max().
+ // BufferNodes not created by bufferhub will have id = 0, meaning "not specified".
+ // TODO(b/118891412): remove default id = 0 and update comments after pdx is no longer in use
+ const uint32_t mId = 0;
+
// The following variables are atomic variables in metadata_ that are visible
// to Bn object and Bp objects. Please find more info in
// BufferHubDefs::MetadataHeader.
diff --git a/services/bufferhub/include/bufferhub/UniqueIdGenerator.h b/services/bufferhub/include/bufferhub/UniqueIdGenerator.h
new file mode 100644
index 0000000000..d2e702f7e0
--- /dev/null
+++ b/services/bufferhub/include/bufferhub/UniqueIdGenerator.h
@@ -0,0 +1,57 @@
+/*
+ * Copyright (C) 2018 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.
+ */
+
+#ifndef ANDROID_FRAMEWORKS_BUFFERHUB_V1_0_ID_GENERATOR_H
+#define ANDROID_FRAMEWORKS_BUFFERHUB_V1_0_ID_GENERATOR_H
+
+#include <mutex>
+#include <set>
+
+#include <utils/Mutex.h>
+
+namespace android {
+namespace frameworks {
+namespace bufferhub {
+namespace V1_0 {
+namespace implementation {
+
+// A thread-safe incremental uint32_t id generator.
+class UniqueIdGenerator {
+public:
+ // 0 is considered invalid
+ static constexpr uint32_t kInvalidId = 0UL;
+
+ // Gets next available id. If next id is greater than std::numeric_limits<uint32_t>::max() (2 ^
+ // 32 - 1), it will try to get an id start from 1 again.
+ uint32_t getId();
+
+ // Free a specific id. Return true on freed, false on not found.
+ bool freeId(uint32_t id);
+
+private:
+ std::mutex mIdsInUseMutex;
+ // Start from kInvalidID to avoid generating it.
+ uint32_t mLastId = kInvalidId;
+ std::set<uint32_t> mIdsInUse GUARDED_BY(mIdsInUseMutex);
+};
+
+} // namespace implementation
+} // namespace V1_0
+} // namespace bufferhub
+} // namespace frameworks
+} // namespace android
+
+#endif // ANDROID_FRAMEWORKS_BUFFERHUB_V1_0_ID_GENERATOR_H
diff --git a/services/bufferhub/tests/Android.bp b/services/bufferhub/tests/Android.bp
index cef31f6ba9..8a30ef5820 100644
--- a/services/bufferhub/tests/Android.bp
+++ b/services/bufferhub/tests/Android.bp
@@ -21,4 +21,20 @@ cc_test {
],
// TODO(b/117568153): Temporarily opt out using libcrt.
no_libcrt: true,
+}
+
+cc_test {
+ name: "UniqueIdGenerator_test",
+ srcs: ["UniqueIdGenerator_test.cpp"],
+ cflags: [
+ "-DLOG_TAG=\"UniqueIdGenerator_test\"",
+ "-DTRACE=0",
+ "-DATRACE_TAG=ATRACE_TAG_GRAPHICS",
+ ],
+ shared_libs: [
+ "libbufferhubservice",
+ ],
+ static_libs: [
+ "libgmock",
+ ],
} \ No newline at end of file
diff --git a/services/bufferhub/tests/UniqueIdGenerator_test.cpp b/services/bufferhub/tests/UniqueIdGenerator_test.cpp
new file mode 100644
index 0000000000..c4d83e0c1f
--- /dev/null
+++ b/services/bufferhub/tests/UniqueIdGenerator_test.cpp
@@ -0,0 +1,45 @@
+#include <bufferhub/UniqueIdGenerator.h>
+#include <gtest/gtest.h>
+
+namespace android {
+namespace frameworks {
+namespace bufferhub {
+namespace V1_0 {
+namespace implementation {
+
+namespace {
+
+class UniqueIdGeneratorTest : public testing::Test {
+protected:
+ UniqueIdGenerator mIdGenerator;
+};
+
+TEST_F(UniqueIdGeneratorTest, TestGenerateAndFreeID) {
+ uint32_t id = mIdGenerator.getId();
+ EXPECT_NE(id, UniqueIdGenerator::kInvalidId);
+
+ EXPECT_TRUE(mIdGenerator.freeId(id));
+ EXPECT_FALSE(mIdGenerator.freeId(id));
+}
+
+TEST_F(UniqueIdGeneratorTest, TestGenerateUniqueIncrementalID) {
+ // 10 IDs should not overflow the UniqueIdGenerator to cause a roll back to start, so the
+ // resulting IDs should still keep incresing.
+ const size_t kTestSize = 10U;
+ uint32_t ids[kTestSize];
+ for (int i = 0; i < kTestSize; ++i) {
+ ids[i] = mIdGenerator.getId();
+ EXPECT_NE(ids[i], UniqueIdGenerator::kInvalidId);
+ if (i >= 1) {
+ EXPECT_GT(ids[i], ids[i - 1]);
+ }
+ }
+}
+
+} // namespace
+
+} // namespace implementation
+} // namespace V1_0
+} // namespace bufferhub
+} // namespace frameworks
+} // namespace android \ No newline at end of file
generated by cgit v1.2.3-59-g8ed1b (git 2.39.0) at 2025-11-02 20:12:05 +0000