1 /* 2 * Copyright (C) 2024 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_ETM_TARGET_MEMORY_H_ 18 #define SRC_TRACE_PROCESSOR_IMPORTERS_ETM_TARGET_MEMORY_H_ 19 20 #include <cstdint> 21 #include <memory> 22 #include <optional> 23 24 #include "perfetto/ext/base/flat_hash_map.h" 25 #include "src/trace_processor/importers/etm/virtual_address_space.h" 26 #include "src/trace_processor/storage/trace_storage.h" 27 #include "src/trace_processor/types/destructible.h" 28 29 namespace perfetto::trace_processor { 30 class AddressRange; 31 class TraceProcessorContext; 32 namespace etm { 33 34 class MappingVersion; 35 36 // This class represents tracks the memory contents for all processes. 37 // It can answer queries in the form: At timestamp t, what was the mapping at 38 // address x for the thread tid. 39 class TargetMemory : public Destructible { 40 public: IsKernelAddress(uint64_t address)41 static bool IsKernelAddress(uint64_t address) { 42 return address & (1ull << 63); 43 } 44 45 static void InitStorage(TraceProcessorContext* context); Get(TraceStorage * storage)46 static const TargetMemory* Get(TraceStorage* storage) { 47 PERFETTO_DCHECK(storage->etm_target_memory() != nullptr); 48 return static_cast<const TargetMemory*>(storage->etm_target_memory()); 49 } 50 51 ~TargetMemory() override; 52 storage()53 TraceStorage* storage() const { return storage_; } 54 55 const MappingVersion* FindMapping(int64_t ts, 56 uint32_t tid, 57 uint64_t address) const; 58 const MappingVersion* FindMapping(int64_t ts, 59 uint32_t tid, 60 const AddressRange& range) const; 61 62 private: 63 explicit TargetMemory(TraceProcessorContext* context); 64 VirtualAddressSpace* FindUserSpaceForTid(uint32_t tid) const; 65 std::optional<UniquePid> FindUpidForTid(uint32_t tid) const; 66 67 TraceStorage* const storage_; 68 // Kernel memory is shared by all processes. 69 VirtualAddressSpace kernel_memory_; 70 71 base::FlatHashMap<UniquePid, VirtualAddressSpace> user_memory_; 72 73 // Cache for quick tid -> upid lookups. 74 // TODO(carlscab): This should probably live in `ProcessTracker` 75 mutable base::FlatHashMap<uint32_t, VirtualAddressSpace*> tid_to_space_; 76 }; 77 78 } // namespace etm 79 } // namespace perfetto::trace_processor 80 81 #endif // SRC_TRACE_PROCESSOR_IMPORTERS_ETM_TARGET_MEMORY_H_ 82