| /** |
| * Copyright (C) ARM Limited 2013-2014. All rights reserved. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| |
| #include "PerfGroup.h" |
| |
| #include <errno.h> |
| #include <string.h> |
| #include <sys/ioctl.h> |
| #include <sys/syscall.h> |
| #include <unistd.h> |
| |
| #include "Buffer.h" |
| #include "Logging.h" |
| #include "Monitor.h" |
| #include "PerfBuffer.h" |
| #include "SessionData.h" |
| |
| #define DEFAULT_PEA_ARGS(pea, additionalSampleType) \ |
| pea.size = sizeof(pea); \ |
| /* Emit time, read_format below, group leader id, and raw tracepoint info */ \ |
| pea.sample_type = PERF_SAMPLE_TIME | PERF_SAMPLE_READ | PERF_SAMPLE_IDENTIFIER | additionalSampleType; \ |
| /* Emit emit value in group format */ \ |
| pea.read_format = PERF_FORMAT_ID | PERF_FORMAT_GROUP; \ |
| /* start out disabled */ \ |
| pea.disabled = 1; \ |
| /* have a sampling interrupt happen when we cross the wakeup_watermark boundary */ \ |
| pea.watermark = 1; \ |
| /* Be conservative in flush size as only one buffer set is monitored */ \ |
| pea.wakeup_watermark = 3 * BUF_SIZE / 4 |
| |
| static int sys_perf_event_open(struct perf_event_attr *const attr, const pid_t pid, const int cpu, const int group_fd, const unsigned long flags) { |
| return syscall(__NR_perf_event_open, attr, pid, cpu, group_fd, flags); |
| } |
| |
| PerfGroup::PerfGroup(PerfBuffer *const pb) : mPb(pb) { |
| memset(&mAttrs, 0, sizeof(mAttrs)); |
| memset(&mKeys, -1, sizeof(mKeys)); |
| memset(&mFds, -1, sizeof(mFds)); |
| } |
| |
| PerfGroup::~PerfGroup() { |
| for (int pos = ARRAY_LENGTH(mFds) - 1; pos >= 0; --pos) { |
| if (mFds[pos] >= 0) { |
| close(mFds[pos]); |
| } |
| } |
| } |
| |
| bool PerfGroup::add(Buffer *const buffer, const int key, const __u32 type, const __u64 config, const __u64 sample, const __u64 sampleType, const int flags) { |
| int i; |
| for (i = 0; i < ARRAY_LENGTH(mKeys); ++i) { |
| if (mKeys[i] < 0) { |
| break; |
| } |
| } |
| |
| if (i >= ARRAY_LENGTH(mKeys)) { |
| logg->logMessage("%s(%s:%i): Too many counters", __FUNCTION__, __FILE__, __LINE__); |
| return false; |
| } |
| |
| DEFAULT_PEA_ARGS(mAttrs[i], sampleType); |
| mAttrs[i].type = type; |
| mAttrs[i].config = config; |
| mAttrs[i].sample_period = sample; |
| // always be on the CPU but only a group leader can be pinned |
| mAttrs[i].pinned = (i == 0 ? 1 : 0); |
| mAttrs[i].mmap = (flags & PERF_GROUP_MMAP ? 1 : 0); |
| mAttrs[i].comm = (flags & PERF_GROUP_COMM ? 1 : 0); |
| mAttrs[i].freq = (flags & PERF_GROUP_FREQ ? 1 : 0); |
| mAttrs[i].task = (flags & PERF_GROUP_TASK ? 1 : 0); |
| mAttrs[i].sample_id_all = (flags & PERF_GROUP_SAMPLE_ID_ALL ? 1 : 0); |
| |
| mKeys[i] = key; |
| |
| buffer->pea(&mAttrs[i], key); |
| |
| return true; |
| } |
| |
| bool PerfGroup::prepareCPU(const int cpu) { |
| logg->logMessage("%s(%s:%i): Onlining cpu %i", __FUNCTION__, __FILE__, __LINE__, cpu); |
| |
| for (int i = 0; i < ARRAY_LENGTH(mKeys); ++i) { |
| if (mKeys[i] < 0) { |
| continue; |
| } |
| |
| const int offset = i * gSessionData->mCores; |
| if (mFds[cpu + offset] >= 0) { |
| logg->logMessage("%s(%s:%i): cpu already online or not correctly cleaned up", __FUNCTION__, __FILE__, __LINE__); |
| return false; |
| } |
| |
| logg->logMessage("%s(%s:%i): perf_event_open cpu: %i type: %lli config: %lli sample: %lli sample_type: %lli", __FUNCTION__, __FILE__, __LINE__, cpu, (long long)mAttrs[i].type, (long long)mAttrs[i].config, (long long)mAttrs[i].sample_period, (long long)mAttrs[i].sample_type); |
| mFds[cpu + offset] = sys_perf_event_open(&mAttrs[i], -1, cpu, i == 0 ? -1 : mFds[cpu], i == 0 ? 0 : PERF_FLAG_FD_OUTPUT); |
| if (mFds[cpu + offset] < 0) { |
| logg->logMessage("%s(%s:%i): failed %s", __FUNCTION__, __FILE__, __LINE__, strerror(errno)); |
| continue; |
| } |
| |
| if (!mPb->useFd(cpu, mFds[cpu + offset], mFds[cpu])) { |
| logg->logMessage("%s(%s:%i): PerfBuffer::useFd failed", __FUNCTION__, __FILE__, __LINE__); |
| return false; |
| } |
| } |
| |
| return true; |
| } |
| |
| int PerfGroup::onlineCPU(const int cpu, const bool start, Buffer *const buffer, Monitor *const monitor) { |
| __u64 ids[ARRAY_LENGTH(mKeys)]; |
| int coreKeys[ARRAY_LENGTH(mKeys)]; |
| int idCount = 0; |
| |
| for (int i = 0; i < ARRAY_LENGTH(mKeys); ++i) { |
| const int fd = mFds[cpu + i * gSessionData->mCores]; |
| if (fd < 0) { |
| continue; |
| } |
| |
| coreKeys[idCount] = mKeys[i]; |
| if (ioctl(fd, PERF_EVENT_IOC_ID, &ids[idCount]) != 0) { |
| logg->logMessage("%s(%s:%i): ioctl failed", __FUNCTION__, __FILE__, __LINE__); |
| return false; |
| } |
| ++idCount; |
| } |
| |
| if (!monitor->add(mFds[cpu])) { |
| logg->logMessage("%s(%s:%i): Monitor::add failed", __FUNCTION__, __FILE__, __LINE__); |
| return false; |
| } |
| |
| buffer->keys(idCount, ids, coreKeys); |
| |
| if (start) { |
| for (int i = 0; i < ARRAY_LENGTH(mKeys); ++i) { |
| int offset = i * gSessionData->mCores + cpu; |
| if (mFds[offset] >= 0 && ioctl(mFds[offset], PERF_EVENT_IOC_ENABLE) < 0) { |
| logg->logMessage("%s(%s:%i): ioctl failed", __FUNCTION__, __FILE__, __LINE__); |
| return false; |
| } |
| } |
| } |
| |
| return idCount; |
| } |
| |
| bool PerfGroup::offlineCPU(const int cpu) { |
| logg->logMessage("%s(%s:%i): Offlining cpu %i", __FUNCTION__, __FILE__, __LINE__, cpu); |
| |
| for (int i = 0; i < ARRAY_LENGTH(mKeys); ++i) { |
| int offset = i * gSessionData->mCores + cpu; |
| if (mFds[offset] >= 0 && ioctl(mFds[offset], PERF_EVENT_IOC_DISABLE) < 0) { |
| logg->logMessage("%s(%s:%i): ioctl failed", __FUNCTION__, __FILE__, __LINE__); |
| return false; |
| } |
| } |
| |
| // Mark the buffer so that it will be released next time it's read |
| mPb->discard(cpu); |
| |
| for (int i = 0; i < ARRAY_LENGTH(mKeys); ++i) { |
| if (mKeys[i] < 0) { |
| continue; |
| } |
| |
| int offset = i * gSessionData->mCores + cpu; |
| if (mFds[offset] >= 0) { |
| close(mFds[offset]); |
| mFds[offset] = -1; |
| } |
| } |
| |
| return true; |
| } |
| |
| bool PerfGroup::start() { |
| for (int pos = 0; pos < ARRAY_LENGTH(mFds); ++pos) { |
| if (mFds[pos] >= 0 && ioctl(mFds[pos], PERF_EVENT_IOC_ENABLE) < 0) { |
| logg->logMessage("%s(%s:%i): ioctl failed", __FUNCTION__, __FILE__, __LINE__); |
| goto fail; |
| } |
| } |
| |
| return true; |
| |
| fail: |
| stop(); |
| |
| return false; |
| } |
| |
| void PerfGroup::stop() { |
| for (int pos = ARRAY_LENGTH(mFds) - 1; pos >= 0; --pos) { |
| if (mFds[pos] >= 0) { |
| ioctl(mFds[pos], PERF_EVENT_IOC_DISABLE); |
| } |
| } |
| } |