1/*
2 * Copyright (c) 2012 ARM Limited
3 * All rights reserved
4 *
5 * The license below extends only to copyright in the software and shall
6 * not be construed as granting a license to any other intellectual
7 * property including but not limited to intellectual property relating
8 * to a hardware implementation of the functionality of the software
9 * licensed hereunder. You may use the software subject to the license
10 * terms below provided that you ensure that this notice is replicated
11 * unmodified and in its entirety in all distributions of the software,
12 * modified or unmodified, in source code or in binary form.
13 *
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions are
16 * met: redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer;
18 * redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution;
21 * neither the name of the copyright holders nor the names of its
22 * contributors may be used to endorse or promote products derived from
23 * this software without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
26 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
27 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
28 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
29 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
30 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
31 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
35 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 *
37 * Authors: Andreas Sandberg
38 */
39
| 1/*
2 * Copyright (c) 2012 ARM Limited
3 * All rights reserved
4 *
5 * The license below extends only to copyright in the software and shall
6 * not be construed as granting a license to any other intellectual
7 * property including but not limited to intellectual property relating
8 * to a hardware implementation of the functionality of the software
9 * licensed hereunder. You may use the software subject to the license
10 * terms below provided that you ensure that this notice is replicated
11 * unmodified and in its entirety in all distributions of the software,
12 * modified or unmodified, in source code or in binary form.
13 *
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions are
16 * met: redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer;
18 * redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution;
21 * neither the name of the copyright holders nor the names of its
22 * contributors may be used to endorse or promote products derived from
23 * this software without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
26 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
27 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
28 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
29 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
30 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
31 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
35 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 *
37 * Authors: Andreas Sandberg
38 */
39
|
45#include <syscall.h>
46#include <unistd.h>
47
48#include <cassert>
49#include <cerrno>
50#include <csignal>
51#include <cstring>
52
53#include "base/misc.hh"
54#include "perfevent.hh"
55
56PerfKvmCounterConfig::PerfKvmCounterConfig(uint32_t type, uint64_t config)
57{
58 memset(&attr, 0, sizeof(attr));
59
60 attr.size = PERF_ATTR_SIZE_VER0;
61 attr.type = type;
62 attr.config = config;
63}
64
65PerfKvmCounterConfig::~PerfKvmCounterConfig()
66{
67}
68
69
70PerfKvmCounter::PerfKvmCounter(PerfKvmCounterConfig &config, pid_t tid)
71 : fd(-1), ringBuffer(NULL), pageSize(-1)
72{
73 attach(config, tid, -1);
74}
75
76PerfKvmCounter::PerfKvmCounter(PerfKvmCounterConfig &config,
77 pid_t tid, const PerfKvmCounter &parent)
78 : fd(-1), ringBuffer(NULL), pageSize(-1)
79{
80 attach(config, tid, parent);
81}
82
83PerfKvmCounter::PerfKvmCounter()
84 : fd(-1), ringBuffer(NULL), pageSize(-1)
85{
86}
87
88PerfKvmCounter::~PerfKvmCounter()
89{
90 if (attached())
91 detach();
92}
93
94void
95PerfKvmCounter::detach()
96{
97 assert(attached());
98
99 if (munmap(ringBuffer, ringNumPages * pageSize) == -1)
100 warn("PerfKvmCounter: Failed to unmap ring buffer (%i)\n",
101 errno);
102 close(fd);
103
104 fd = -1;
105 ringBuffer = NULL;
106}
107
108void
109PerfKvmCounter::start()
110{
111 if (ioctl(PERF_EVENT_IOC_ENABLE, PERF_IOC_FLAG_GROUP) == -1)
112 panic("KVM: Failed to enable performance counters (%i)\n", errno);
113}
114
115void
116PerfKvmCounter::stop()
117{
118 if (ioctl(PERF_EVENT_IOC_DISABLE, PERF_IOC_FLAG_GROUP) == -1)
119 panic("KVM: Failed to disable performance counters (%i)\n", errno);
120}
121
122void
123PerfKvmCounter::period(uint64_t period)
124{
125 if (ioctl(PERF_EVENT_IOC_PERIOD, &period) == -1)
126 panic("KVM: Failed to set period of performance counter (%i)\n", errno);
127}
128
129void
130PerfKvmCounter::refresh(int refresh)
131{
132 if (ioctl(PERF_EVENT_IOC_REFRESH, refresh) == -1)
133 panic("KVM: Failed to refresh performance counter (%i)\n", errno);
134}
135
136uint64_t
137PerfKvmCounter::read() const
138{
139 uint64_t value;
140
141 read(&value, sizeof(uint64_t));
142 return value;
143}
144
145void
146PerfKvmCounter::enableSignals(pid_t tid, int signal)
147{
148 struct f_owner_ex sigowner;
149
150 sigowner.type = F_OWNER_TID;
151 sigowner.pid = tid;
152
153 if (fcntl(F_SETOWN_EX, &sigowner) == -1 ||
154 fcntl(F_SETSIG, signal) == -1 ||
155 fcntl(F_SETFL, O_ASYNC) == -1)
156 panic("PerfKvmCounter: Failed to enable signals for counter (%i)\n",
157 errno);
158}
159
160void
161PerfKvmCounter::attach(PerfKvmCounterConfig &config,
162 pid_t tid, int group_fd)
163{
164 assert(!attached());
165
166 fd = syscall(__NR_perf_event_open,
167 &config.attr, tid,
168 -1, // CPU (-1 => Any CPU that the task happens to run on)
169 group_fd,
170 0); // Flags
171 if (fd == -1)
172 panic("PerfKvmCounter::open failed (%i)\n", errno);
173
174 mmapPerf(1);
175}
176
177pid_t
178PerfKvmCounter::gettid()
179{
180 return syscall(__NR_gettid);
181}
182
183void
184PerfKvmCounter::mmapPerf(int pages)
185{
186 assert(attached());
187 assert(ringBuffer == NULL);
188
189 if (pageSize == -1) {
190 pageSize = sysconf(_SC_PAGE_SIZE);
191 if (pageSize == -1)
192 panic("PerfKvmCounter: Failed to determine page size (%i)\n",
193 errno);
194 }
195
196 ringNumPages = pages + 1;
197 ringBuffer = (struct perf_event_mmap_page *)mmap(
198 NULL, ringNumPages * 4096,
199 PROT_READ | PROT_WRITE, MAP_SHARED,
200 fd, 0);
201 if (ringBuffer == MAP_FAILED)
202 panic("PerfKvmCounter: MMAP failed (%i)\n",
203 errno);
204}
205
206int
207PerfKvmCounter::fcntl(int cmd, long p1)
208{
209 assert(attached());
210 return ::fcntl(fd, cmd, p1);
211}
212
213int
214PerfKvmCounter::ioctl(int request, long p1)
215{
216 assert(attached());
217 return ::ioctl(fd, request, p1);
218}
219
220void
221PerfKvmCounter::read(void *buf, size_t size) const
222{
223 char *_buf = (char *)buf;
224 size_t _size = size;
225
226 assert(attached());
227
228 do {
229 ssize_t ret;
230 ret = ::read(fd, _buf, _size);
231 switch (ret) {
232 case -1:
233 if (errno != EAGAIN)
234 panic("PerfKvmCounter::read failed (%i)\n", errno);
235 break;
236
237 case 0:
238 panic("PerfKvmCounter::read unexpected EOF.\n");
239
240 default:
241 _size -= ret;
242 _buf += ret;
243 break;
244 }
245 } while (_size);
246}
| 45#include <syscall.h>
46#include <unistd.h>
47
48#include <cassert>
49#include <cerrno>
50#include <csignal>
51#include <cstring>
52
53#include "base/misc.hh"
54#include "perfevent.hh"
55
56PerfKvmCounterConfig::PerfKvmCounterConfig(uint32_t type, uint64_t config)
57{
58 memset(&attr, 0, sizeof(attr));
59
60 attr.size = PERF_ATTR_SIZE_VER0;
61 attr.type = type;
62 attr.config = config;
63}
64
65PerfKvmCounterConfig::~PerfKvmCounterConfig()
66{
67}
68
69
70PerfKvmCounter::PerfKvmCounter(PerfKvmCounterConfig &config, pid_t tid)
71 : fd(-1), ringBuffer(NULL), pageSize(-1)
72{
73 attach(config, tid, -1);
74}
75
76PerfKvmCounter::PerfKvmCounter(PerfKvmCounterConfig &config,
77 pid_t tid, const PerfKvmCounter &parent)
78 : fd(-1), ringBuffer(NULL), pageSize(-1)
79{
80 attach(config, tid, parent);
81}
82
83PerfKvmCounter::PerfKvmCounter()
84 : fd(-1), ringBuffer(NULL), pageSize(-1)
85{
86}
87
88PerfKvmCounter::~PerfKvmCounter()
89{
90 if (attached())
91 detach();
92}
93
94void
95PerfKvmCounter::detach()
96{
97 assert(attached());
98
99 if (munmap(ringBuffer, ringNumPages * pageSize) == -1)
100 warn("PerfKvmCounter: Failed to unmap ring buffer (%i)\n",
101 errno);
102 close(fd);
103
104 fd = -1;
105 ringBuffer = NULL;
106}
107
108void
109PerfKvmCounter::start()
110{
111 if (ioctl(PERF_EVENT_IOC_ENABLE, PERF_IOC_FLAG_GROUP) == -1)
112 panic("KVM: Failed to enable performance counters (%i)\n", errno);
113}
114
115void
116PerfKvmCounter::stop()
117{
118 if (ioctl(PERF_EVENT_IOC_DISABLE, PERF_IOC_FLAG_GROUP) == -1)
119 panic("KVM: Failed to disable performance counters (%i)\n", errno);
120}
121
122void
123PerfKvmCounter::period(uint64_t period)
124{
125 if (ioctl(PERF_EVENT_IOC_PERIOD, &period) == -1)
126 panic("KVM: Failed to set period of performance counter (%i)\n", errno);
127}
128
129void
130PerfKvmCounter::refresh(int refresh)
131{
132 if (ioctl(PERF_EVENT_IOC_REFRESH, refresh) == -1)
133 panic("KVM: Failed to refresh performance counter (%i)\n", errno);
134}
135
136uint64_t
137PerfKvmCounter::read() const
138{
139 uint64_t value;
140
141 read(&value, sizeof(uint64_t));
142 return value;
143}
144
145void
146PerfKvmCounter::enableSignals(pid_t tid, int signal)
147{
148 struct f_owner_ex sigowner;
149
150 sigowner.type = F_OWNER_TID;
151 sigowner.pid = tid;
152
153 if (fcntl(F_SETOWN_EX, &sigowner) == -1 ||
154 fcntl(F_SETSIG, signal) == -1 ||
155 fcntl(F_SETFL, O_ASYNC) == -1)
156 panic("PerfKvmCounter: Failed to enable signals for counter (%i)\n",
157 errno);
158}
159
160void
161PerfKvmCounter::attach(PerfKvmCounterConfig &config,
162 pid_t tid, int group_fd)
163{
164 assert(!attached());
165
166 fd = syscall(__NR_perf_event_open,
167 &config.attr, tid,
168 -1, // CPU (-1 => Any CPU that the task happens to run on)
169 group_fd,
170 0); // Flags
171 if (fd == -1)
172 panic("PerfKvmCounter::open failed (%i)\n", errno);
173
174 mmapPerf(1);
175}
176
177pid_t
178PerfKvmCounter::gettid()
179{
180 return syscall(__NR_gettid);
181}
182
183void
184PerfKvmCounter::mmapPerf(int pages)
185{
186 assert(attached());
187 assert(ringBuffer == NULL);
188
189 if (pageSize == -1) {
190 pageSize = sysconf(_SC_PAGE_SIZE);
191 if (pageSize == -1)
192 panic("PerfKvmCounter: Failed to determine page size (%i)\n",
193 errno);
194 }
195
196 ringNumPages = pages + 1;
197 ringBuffer = (struct perf_event_mmap_page *)mmap(
198 NULL, ringNumPages * 4096,
199 PROT_READ | PROT_WRITE, MAP_SHARED,
200 fd, 0);
201 if (ringBuffer == MAP_FAILED)
202 panic("PerfKvmCounter: MMAP failed (%i)\n",
203 errno);
204}
205
206int
207PerfKvmCounter::fcntl(int cmd, long p1)
208{
209 assert(attached());
210 return ::fcntl(fd, cmd, p1);
211}
212
213int
214PerfKvmCounter::ioctl(int request, long p1)
215{
216 assert(attached());
217 return ::ioctl(fd, request, p1);
218}
219
220void
221PerfKvmCounter::read(void *buf, size_t size) const
222{
223 char *_buf = (char *)buf;
224 size_t _size = size;
225
226 assert(attached());
227
228 do {
229 ssize_t ret;
230 ret = ::read(fd, _buf, _size);
231 switch (ret) {
232 case -1:
233 if (errno != EAGAIN)
234 panic("PerfKvmCounter::read failed (%i)\n", errno);
235 break;
236
237 case 0:
238 panic("PerfKvmCounter::read unexpected EOF.\n");
239
240 default:
241 _size -= ret;
242 _buf += ret;
243 break;
244 }
245 } while (_size);
246}
|