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/*
* Copyright © 2020-2021 Collabora, Ltd.
* Author: Antonio Caggiano <antonio.caggiano@collabora.com>
*
* SPDX-License-Identifier: MIT
*/
#pragma once
#include <pps/pps_driver.h>
extern "C" {
struct intel_perf_query_info;
};
namespace pps
{
class IntelPerf;
/// @brief Variable length sequence of bytes generated by Intel Obstervation Architecture (OA)
struct PerfRecord {
/// Timestamp in the GPU clock domain
uint64_t timestamp;
/// drm_i915_perf_record_header + report data
std::vector<uint8_t> data;
};
/// @brief PPS Driver implementation for Intel graphics devices.
/// When sampling it may collect multiple perf-records at once. Each perf-record holds multiple
/// counter values. Those values are continuously incremented by the GPU. In order to get a delta,
/// the driver computes an _accumulation_ (`last_perf_record - previous_perf_record`).
/// For optimization purposes, it might ignore some perf-records, considering only those
/// perf-records close to the boundary of the sampling period range.
class IntelDriver : public Driver
{
public:
IntelDriver();
~IntelDriver();
uint64_t get_min_sampling_period_ns() override;
bool init_perfcnt() override;
void enable_counter(uint32_t counter_id) override;
void enable_all_counters() override;
void enable_perfcnt(uint64_t sampling_period_ns) override;
void disable_perfcnt() override;
bool dump_perfcnt() override;
uint64_t next() override;
uint32_t gpu_clock_id() const override;
uint64_t gpu_timestamp() const override;
private:
/// @brief Requests the next perf sample
/// @return The sample GPU timestamp
uint64_t gpu_next();
/// @param data Buffer of bytes to parse
/// @param byte_count Number of bytes to parse
/// @return A list of perf records parsed from raw data passed as input
std::vector<PerfRecord> parse_perf_records(const std::vector<uint8_t> &data, size_t byte_count);
/// @brief Reads data from the GPU metric set
void read_data_from_metric_set();
/// Sampling period in nanoseconds requested by the datasource
uint64_t sampling_period_ns = 0;
/// Last upper 32bits of the GPU timestamp in the parsed reports
uint64_t gpu_timestamp_udw = 0;
/// Keep track of the timestamp of the last sample generated (upper & lower
/// 32bits)
uint64_t last_gpu_timestamp = 0;
/// Data buffer used to store data read from the metric set
std::vector<uint8_t> metric_buffer = std::vector<uint8_t>(1024, 0);
/// Number of bytes read so far still un-parsed.
/// Reset once bytes from the metric buffer are parsed to perf records
size_t total_bytes_read = 0;
/// List of OA perf records read so far
std::vector<PerfRecord> records;
std::unique_ptr<IntelPerf> perf;
// Gpu clock ID used to correlate GPU/CPU timestamps
uint32_t clock_id = 0;
// Selected query
intel_perf_query_info *selected_query = nullptr;
};
} // namespace pps
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