1 /*
2 * Copyright (c) 2017-2019 Arm Limited.
3 *
4 * SPDX-License-Identifier: MIT
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to
8 * deal in the Software without restriction, including without limitation the
9 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
10 * sell copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in all
14 * copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
22 * SOFTWARE.
23 */
24 #include "PMU.h"
25
26 #include <asm/unistd.h>
27 #include <cstring>
28 #include <stdexcept>
29 #include <sys/ioctl.h>
30
31 namespace arm_compute
32 {
33 namespace test
34 {
35 namespace framework
36 {
PMU()37 PMU::PMU()
38 : _perf_config()
39 {
40 _perf_config.type = PERF_TYPE_HARDWARE;
41 _perf_config.size = sizeof(perf_event_attr);
42
43 // Start disabled
44 _perf_config.disabled = 1;
45 // The inherit bit specifies that this counter should count events of child
46 // tasks as well as the task specified
47 _perf_config.inherit = 1;
48 // Enables saving of event counts on context switch for inherited tasks
49 _perf_config.inherit_stat = 1;
50 }
51
PMU(uint64_t config)52 PMU::PMU(uint64_t config)
53 : PMU()
54 {
55 open(config);
56 }
57
~PMU()58 PMU::~PMU()
59 {
60 close();
61 }
62
open(uint64_t config)63 void PMU::open(uint64_t config)
64 {
65 _perf_config.config = config;
66 open(_perf_config);
67 }
68
open(const perf_event_attr & perf_config)69 void PMU::open(const perf_event_attr &perf_config)
70 {
71 // Measure this process/thread (+ children) on any CPU
72 _fd = syscall(__NR_perf_event_open, &perf_config, 0, -1, -1, 0);
73
74 ARM_COMPUTE_ERROR_ON_MSG(_fd < 0, "perf_event_open failed");
75
76 const int result = ioctl(_fd, PERF_EVENT_IOC_ENABLE, 0);
77 if(result == -1)
78 {
79 ARM_COMPUTE_ERROR_VAR("Failed to enable PMU counter: %d", errno);
80 }
81 }
82
close()83 void PMU::close()
84 {
85 if(_fd != -1)
86 {
87 ::close(_fd);
88 _fd = -1;
89 }
90 }
91
reset()92 void PMU::reset()
93 {
94 const int result = ioctl(_fd, PERF_EVENT_IOC_RESET, 0);
95 if(result == -1)
96 {
97 ARM_COMPUTE_ERROR_VAR("Failed to reset PMU counter: %d", errno);
98 }
99 }
100 } // namespace framework
101 } // namespace test
102 } // namespace arm_compute
103