121 lines
2.9 KiB
C++
121 lines
2.9 KiB
C++
/*
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* Copyright © 2021 Collabora, Ltd.
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* Author: Antonio Caggiano <antonio.caggiano@collabora.com>
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*
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* SPDX-License-Identifier: MIT
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*/
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#include "intel_pps_perf.h"
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#include <math.h>
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#include <sys/ioctl.h>
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#include <util/ralloc.h>
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#include <utility>
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#include "drm-uapi/i915_drm.h"
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#include <pps/pps.h>
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#include <pps/pps_device.h>
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namespace pps
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{
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IntelPerf::IntelPerf(const int drm_fd)
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: drm_fd {drm_fd}
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, ralloc_ctx {ralloc_context(nullptr)}
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, ralloc_cfg {ralloc_context(nullptr)}
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, cfg {intel_perf_new(ralloc_cfg)}
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{
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assert(drm_fd >= 0 && "DRM fd is not valid");
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if (!intel_get_device_info_from_fd(drm_fd, &devinfo)) {
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PPS_LOG_FATAL("Failed to get devinfo");
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}
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intel_perf_init_metrics(cfg,
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&devinfo,
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drm_fd,
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false, // no pipeline statistics
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false // no register snapshots
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);
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}
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IntelPerf::~IntelPerf()
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{
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close();
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if (ralloc_ctx) {
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ralloc_free(ralloc_ctx);
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}
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if (ralloc_cfg) {
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ralloc_free(ralloc_cfg);
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}
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}
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std::vector<struct intel_perf_query_info *> IntelPerf::get_queries() const
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{
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assert(cfg && "Intel perf config should be valid");
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assert(cfg->n_queries && "Intel perf queries not initialized");
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std::vector<struct intel_perf_query_info *> queries = {};
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for (int i = 0; i < cfg->n_queries; ++i) {
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struct intel_perf_query_info *query = &cfg->queries[i];
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// Skip invalid queries
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if (query && query->symbol_name) {
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queries.push_back(query);
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}
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}
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return queries;
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}
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// The period_exponent gives a sampling period as follows:
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// sample_period = timestamp_period * 2^(period_exponent + 1)
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// where timestamp_period is 80ns for Haswell+
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static uint32_t get_oa_exponent(const intel_device_info *devinfo, const uint64_t sampling_period_ns)
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{
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return static_cast<uint32_t>(log2(sampling_period_ns * devinfo->timestamp_frequency / 1000000000ull)) - 1;
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}
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bool IntelPerf::open(const uint64_t sampling_period_ns,
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struct intel_perf_query_info *query)
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{
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assert(!ctx && "Perf context should not be initialized at this point");
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ctx = intel_perf_new_context(ralloc_ctx);
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intel_perf_init_context(ctx, cfg, nullptr, nullptr, nullptr, &devinfo, 0, drm_fd);
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auto oa_exponent = get_oa_exponent(&devinfo, sampling_period_ns);
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return intel_perf_open(ctx,
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query->oa_metrics_set_id,
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query->oa_format,
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oa_exponent,
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drm_fd,
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INTEL_PERF_INVALID_CTX_ID,
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true /* enable stream immediately */);
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}
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void IntelPerf::close()
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{
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if (ctx) {
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intel_perf_close(ctx, nullptr);
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ctx = nullptr;
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}
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}
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bool IntelPerf::oa_stream_ready() const
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{
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assert(ctx && "Perf context was not open");
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return intel_perf_oa_stream_ready(ctx);
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}
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ssize_t IntelPerf::read_oa_stream(void *buf, size_t bytes) const
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{
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assert(ctx && "Perf context was not open");
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return intel_perf_read_oa_stream(ctx, buf, bytes);
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}
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} // namespace pps
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