cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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perfbuf_bench.c (744B)

      1// SPDX-License-Identifier: GPL-2.0
      2// Copyright (c) 2020 Facebook
      3
      4#include <linux/bpf.h>
      5#include <stdint.h>
      6#include <bpf/bpf_helpers.h>
      7#include "bpf_misc.h"
      8
      9char _license[] SEC("license") = "GPL";
     10
     11struct {
     12	__uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY);
     13	__uint(value_size, sizeof(int));
     14	__uint(key_size, sizeof(int));
     15} perfbuf SEC(".maps");
     16
     17const volatile int batch_cnt = 0;
     18
     19long sample_val = 42;
     20long dropped __attribute__((aligned(128))) = 0;
     21
     22SEC("fentry/" SYS_PREFIX "sys_getpgid")
     23int bench_perfbuf(void *ctx)
     24{
     25	__u64 *sample;
     26	int i;
     27
     28	for (i = 0; i < batch_cnt; i++) {
     29		if (bpf_perf_event_output(ctx, &perfbuf, BPF_F_CURRENT_CPU,
     30					  &sample_val, sizeof(sample_val)))
     31			__sync_add_and_fetch(&dropped, 1);
     32	}
     33	return 0;
     34}