xref: /aosp_15_r20/external/perfetto/src/trace_processor/importers/perf/time_conv_record.h (revision 6dbdd20afdafa5e3ca9b8809fa73465d530080dc)
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_PERF_TIME_CONV_RECORD_H_
18 #define SRC_TRACE_PROCESSOR_IMPORTERS_PERF_TIME_CONV_RECORD_H_
19 
20 #include <cstdint>
21 
22 namespace perfetto::trace_processor::perf_importer {
23 
24 struct TimeConvRecord {
25   uint64_t time_shift;
26   uint64_t time_mult;
27   uint64_t time_zero;
28   uint64_t time_cycles;
29   uint64_t time_mask;
30   uint8_t cap_user_time_zero;
31   uint8_t cap_user_time_short;
32   uint8_t reserved[6];  // alignment
33 
ConvertTscToPerfTimeTimeConvRecord34   uint64_t ConvertTscToPerfTime(uint64_t cycles) const {
35     uint64_t quot, rem;
36 
37     if (cap_user_time_short) {
38       cycles = time_cycles + ((cycles - time_cycles) & time_mask);
39     }
40 
41     quot = cycles >> time_shift;
42     rem = cycles & ((uint64_t(1) << time_shift) - 1);
43     return time_zero + quot * time_mult + ((rem * time_mult) >> time_shift);
44   }
45 };
46 
47 }  // namespace perfetto::trace_processor::perf_importer
48 
49 #endif  // SRC_TRACE_PROCESSOR_IMPORTERS_PERF_TIME_CONV_RECORD_H_
50