1 /* 2 * Copyright (C) 2022 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef SRC_TRACE_PROCESSOR_IMPORTERS_I2C_I2C_TRACKER_H_ 18 #define SRC_TRACE_PROCESSOR_IMPORTERS_I2C_I2C_TRACKER_H_ 19 20 #include <limits> 21 #include <tuple> 22 23 #include "perfetto/ext/base/flat_hash_map.h" 24 #include "perfetto/ext/base/string_view.h" 25 #include "src/trace_processor/importers/common/slice_tracker.h" 26 #include "src/trace_processor/importers/common/track_tracker.h" 27 #include "src/trace_processor/storage/trace_storage.h" 28 #include "src/trace_processor/types/destructible.h" 29 #include "src/trace_processor/types/trace_processor_context.h" 30 31 namespace perfetto { 32 namespace trace_processor { 33 34 static constexpr size_t kMaxI2cAdapters = 256; 35 36 using I2cAdapterId = uint32_t; 37 38 class I2cTracker : public Destructible { 39 public: 40 I2cTracker(const I2cTracker&) = delete; 41 I2cTracker& operator=(const I2cTracker&) = delete; 42 ~I2cTracker() override; GetOrCreate(TraceProcessorContext * context)43 static I2cTracker* GetOrCreate(TraceProcessorContext* context) { 44 if (!context->i2c_tracker) { 45 context->i2c_tracker.reset(new I2cTracker(context)); 46 } 47 return static_cast<I2cTracker*>(context->i2c_tracker.get()); 48 } 49 50 struct I2cAdapterMessageCount { 51 I2cAdapterId adapter_nr{}; 52 uint32_t nr_msgs{}; 53 }; 54 55 // Enter processes the start of an I2C transaction, which consists of a 56 // series i2c_write and i2c_read's. Multiple messages may be included in a 57 // transaction. The position of a write or read message in the transaction 58 // is indicated by the msg_nr field. 59 void Enter(int64_t ts, UniqueTid utid, uint32_t adapter_nr, uint32_t msg_nr); 60 61 // Exit processes the end of an I2C transaction, which is indicated by an 62 // i2c_result. The nr_msgs field indicates how many write or read requests 63 // are considered to be matching the current i2c_result. 64 void Exit(int64_t ts, UniqueTid utid, uint32_t adapter_nr, uint32_t nr_msgs); 65 66 private: 67 explicit I2cTracker(TraceProcessorContext*); 68 TraceProcessorContext* const context_; 69 std::array<StringId, kMaxI2cAdapters> i2c_adapter_to_string_id_{}; 70 71 // In-flight I2C operation counts per I2C adapter per Unique TID. This is 72 // used to match an i2c_result message against the i2c_read and i2c_write 73 // messages that precede it in the transaction. 74 base::FlatHashMap<UniqueTid, std::vector<I2cAdapterMessageCount>> 75 inflight_i2c_ops_; 76 }; 77 78 } // namespace trace_processor 79 } // namespace perfetto 80 81 #endif // SRC_TRACE_PROCESSOR_IMPORTERS_I2C_I2C_TRACKER_H_ 82