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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mmcr0_fc56_pmc1ce_test.c (1342B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Copyright 2022, Athira Rajeev, IBM Corp.
      4 */
      5
      6#include <stdio.h>
      7#include <stdlib.h>
      8
      9#include "../event.h"
     10#include "misc.h"
     11#include "utils.h"
     12
     13extern void thirty_two_instruction_loop(int loops);
     14
     15/*
     16 * A perf sampling test for mmcr0
     17 * fields: fc56, pmc1ce.
     18 */
     19static int mmcr0_fc56_pmc1ce(void)
     20{
     21	struct event event;
     22	u64 *intr_regs;
     23
     24	/* Check for platform support for the test */
     25	SKIP_IF(check_pvr_for_sampling_tests());
     26
     27	/* Init the event for the sampling test */
     28	event_init_sampling(&event, 0x1001e);
     29	event.attr.sample_regs_intr = platform_extended_mask;
     30	FAIL_IF(event_open(&event));
     31	event.mmap_buffer = event_sample_buf_mmap(event.fd, 1);
     32
     33	FAIL_IF(event_enable(&event));
     34
     35	/* workload to make the event overflow */
     36	thirty_two_instruction_loop(10000);
     37
     38	FAIL_IF(event_disable(&event));
     39
     40	/* Check for sample count */
     41	FAIL_IF(!collect_samples(event.mmap_buffer));
     42
     43	intr_regs = get_intr_regs(&event, event.mmap_buffer);
     44
     45	/* Check for intr_regs */
     46	FAIL_IF(!intr_regs);
     47
     48	/* Verify that fc56, pmc1ce fields are set in MMCR0 */
     49	FAIL_IF(!get_mmcr0_fc56(get_reg_value(intr_regs, "MMCR0"), 1));
     50	FAIL_IF(!get_mmcr0_pmc1ce(get_reg_value(intr_regs, "MMCR0"), 1));
     51
     52	event_close(&event);
     53	return 0;
     54}
     55
     56int main(void)
     57{
     58	return test_harness(mmcr0_fc56_pmc1ce, "mmcr0_fc56_pmc1ce");
     59}