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 "src/trace_processor/importers/common/address_range.h"
26 #include "src/trace_processor/importers/etm/virtual_address_space.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::trace_processor::etm {
32
33 // static
InitStorage(TraceProcessorContext * context)34 void TargetMemory::InitStorage(TraceProcessorContext* context) {
35 PERFETTO_CHECK(context->storage->etm_target_memory() == nullptr);
36 context->storage->set_etm_target_memory(
37 std::unique_ptr<Destructible>(new TargetMemory(context)));
38 }
39
TargetMemory(TraceProcessorContext * context)40 TargetMemory::TargetMemory(TraceProcessorContext* context)
41 : storage_(context->storage.get()) {
42 auto kernel = VirtualAddressSpace::Builder(context);
43 base::FlatHashMap<UniquePid, VirtualAddressSpace::Builder> user;
44
45 for (auto mmap = context->storage->mmap_record_table().IterateRows(); mmap;
46 ++mmap) {
47 std::optional<UniquePid> upid = mmap.upid();
48 if (!upid) {
49 kernel.AddMapping(mmap.row_reference());
50 continue;
51 }
52 auto it = user.Find(*upid);
53 if (!it) {
54 it = user.Insert(*upid, VirtualAddressSpace::Builder(context)).first;
55 }
56 it->AddMapping(mmap.row_reference());
57 }
58
59 kernel_memory_ = std::move(kernel).Build();
60 for (auto it = user.GetIterator(); it; ++it) {
61 user_memory_.Insert(it.key(), std::move(it.value()).Build());
62 }
63 }
64 TargetMemory::~TargetMemory() = default;
65
FindUserSpaceForTid(uint32_t tid) const66 VirtualAddressSpace* TargetMemory::FindUserSpaceForTid(uint32_t tid) const {
67 auto user_mem = tid_to_space_.Find(tid);
68 if (PERFETTO_UNLIKELY(!user_mem)) {
69 std::optional<UniquePid> upid = FindUpidForTid(tid);
70 user_mem =
71 tid_to_space_.Insert(tid, upid ? user_memory_.Find(*upid) : nullptr)
72 .first;
73 }
74
75 return *user_mem;
76 }
77
FindUpidForTid(uint32_t tid) const78 std::optional<UniquePid> TargetMemory::FindUpidForTid(uint32_t tid) const {
79 const auto& tread_table = storage_->thread_table();
80 Query q;
81 q.constraints = {tread_table.tid().eq(tid)};
82 auto it = tread_table.FilterToIterator(q);
83 if (!it) {
84 return std::nullopt;
85 }
86 return it.upid();
87 }
88
FindMapping(int64_t ts,uint32_t tid,uint64_t address) const89 const MappingVersion* TargetMemory::FindMapping(int64_t ts,
90 uint32_t tid,
91 uint64_t address) const {
92 if (IsKernelAddress(address)) {
93 return kernel_memory_.FindMapping(ts, address);
94 }
95 auto* vas = FindUserSpaceForTid(tid);
96 if (!vas) {
97 return nullptr;
98 }
99 return vas->FindMapping(ts, address);
100 }
101
FindMapping(int64_t ts,uint32_t tid,const AddressRange & range) const102 const MappingVersion* TargetMemory::FindMapping(
103 int64_t ts,
104 uint32_t tid,
105 const AddressRange& range) const {
106 const MappingVersion* m = FindMapping(ts, tid, range.start());
107 if (!m || range.end() > m->end()) {
108 return nullptr;
109 }
110 return m;
111 }
112
113 } // namespace perfetto::trace_processor::etm
114