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 #include "src/trace_processor/importers/etm/target_memory.h"
18
19 #include <memory>
20 #include <optional>
21
22 #include "perfetto/base/logging.h"
23 #include "perfetto/ext/base/flat_hash_map.h"
24 #include "perfetto/public/compiler.h"
25 #include "perfetto/trace_processor/trace_blob_view.h"
26 #include "src/trace_processor/importers/common/address_range.h"
27 #include "src/trace_processor/importers/etm/mapping_version.h"
28 #include "src/trace_processor/importers/etm/virtual_address_space.h"
29 #include "src/trace_processor/storage/trace_storage.h"
30 #include "src/trace_processor/tables/metadata_tables_py.h"
31 #include "src/trace_processor/types/destructible.h"
32 #include "src/trace_processor/types/trace_processor_context.h"
33
34 namespace perfetto::trace_processor::etm {
35
36 // static
InitStorage(TraceProcessorContext * context)37 void TargetMemory::InitStorage(TraceProcessorContext* context) {
38 PERFETTO_CHECK(context->storage->etm_target_memory() == nullptr);
39 context->storage->set_etm_target_memory(
40 std::unique_ptr<Destructible>(new TargetMemory(context)));
41 }
42
TargetMemory(TraceProcessorContext * context)43 TargetMemory::TargetMemory(TraceProcessorContext* context)
44 : storage_(context->storage.get()) {
45 auto kernel = VirtualAddressSpace::Builder(context);
46 base::FlatHashMap<UniquePid, VirtualAddressSpace::Builder> user;
47
48 for (auto mmap = context->storage->mmap_record_table().IterateRows(); mmap;
49 ++mmap) {
50 std::optional<UniquePid> upid = mmap.upid();
51 if (!upid) {
52 kernel.AddMapping(mmap.row_reference());
53 continue;
54 }
55 auto it = user.Find(*upid);
56 if (!it) {
57 it = user.Insert(*upid, VirtualAddressSpace::Builder(context)).first;
58 }
59 it->AddMapping(mmap.row_reference());
60 }
61
62 kernel_memory_ = std::move(kernel).Build();
63 for (auto it = user.GetIterator(); it; ++it) {
64 user_memory_.Insert(it.key(), std::move(it.value()).Build());
65 }
66 }
67 TargetMemory::~TargetMemory() = default;
68
FindUserSpaceForTid(uint32_t tid) const69 VirtualAddressSpace* TargetMemory::FindUserSpaceForTid(uint32_t tid) const {
70 auto user_mem = tid_to_space_.Find(tid);
71 if (PERFETTO_UNLIKELY(!user_mem)) {
72 std::optional<UniquePid> upid = FindUpidForTid(tid);
73 user_mem =
74 tid_to_space_.Insert(tid, upid ? user_memory_.Find(*upid) : nullptr)
75 .first;
76 }
77
78 return *user_mem;
79 }
80
FindUpidForTid(uint32_t tid) const81 std::optional<UniquePid> TargetMemory::FindUpidForTid(uint32_t tid) const {
82 const auto& tread_table = storage_->thread_table();
83 Query q;
84 q.constraints = {tread_table.tid().eq(tid)};
85 auto it = tread_table.FilterToIterator(q);
86 if (!it) {
87 return std::nullopt;
88 }
89 return it.upid();
90 }
91
FindMapping(int64_t ts,uint32_t tid,uint64_t address) const92 const MappingVersion* TargetMemory::FindMapping(int64_t ts,
93 uint32_t tid,
94 uint64_t address) const {
95 if (IsKernelAddress(address)) {
96 return kernel_memory_.FindMapping(ts, address);
97 }
98 auto* vas = FindUserSpaceForTid(tid);
99 if (!vas) {
100 return nullptr;
101 }
102 return vas->FindMapping(ts, address);
103 }
104
FindMapping(int64_t ts,uint32_t tid,const AddressRange & range) const105 const MappingVersion* TargetMemory::FindMapping(
106 int64_t ts,
107 uint32_t tid,
108 const AddressRange& range) const {
109 const MappingVersion* m = FindMapping(ts, tid, range.start());
110 if (!m || range.end() > m->end()) {
111 return nullptr;
112 }
113 return m;
114 }
115
116 } // namespace perfetto::trace_processor::etm
117