tools/testing/selftests/powerpc/pmu/ebb/multi_counter_test.c

Source file repositories/reference/linux-study-clean/tools/testing/selftests/powerpc/pmu/ebb/multi_counter_test.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/powerpc/pmu/ebb/multi_counter_test.c
Extension
.c
Size
2070 bytes
Lines
87
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright 2014, Michael Ellerman, IBM Corp.
 */

#include <stdio.h>
#include <stdlib.h>
#include <sys/ioctl.h>

#include "ebb.h"


/*
 * Test counting multiple events using EBBs.
 */
int multi_counter(void)
{
	struct event events[6];
	int i, group_fd;

	SKIP_IF(!ebb_is_supported());

	event_init_named(&events[0], 0x1001C, "PM_CMPLU_STALL_THRD");
	event_init_named(&events[1], 0x2D016, "PM_CMPLU_STALL_FXU");
	event_init_named(&events[2], 0x30006, "PM_CMPLU_STALL_OTHER_CMPL");
	event_init_named(&events[3], 0x4000A, "PM_CMPLU_STALL");
	event_init_named(&events[4], 0x600f4, "PM_RUN_CYC");
	event_init_named(&events[5], 0x500fa, "PM_RUN_INST_CMPL");

	event_leader_ebb_init(&events[0]);
	for (i = 1; i < 6; i++)
		event_ebb_init(&events[i]);

	group_fd = -1;
	for (i = 0; i < 6; i++) {
		events[i].attr.exclude_kernel = 1;
		events[i].attr.exclude_hv = 1;
		events[i].attr.exclude_idle = 1;

		FAIL_IF(event_open_with_group(&events[i], group_fd));
		if (group_fd == -1)
			group_fd = events[0].fd;
	}

	ebb_enable_pmc_counting(1);
	ebb_enable_pmc_counting(2);
	ebb_enable_pmc_counting(3);
	ebb_enable_pmc_counting(4);
	ebb_enable_pmc_counting(5);
	ebb_enable_pmc_counting(6);
	setup_ebb_handler(standard_ebb_callee);

	FAIL_IF(ioctl(events[0].fd, PERF_EVENT_IOC_ENABLE, PERF_IOC_FLAG_GROUP));
	FAIL_IF(event_read(&events[0]));

	ebb_global_enable();

	mtspr(SPRN_PMC1, pmc_sample_period(sample_period));
	mtspr(SPRN_PMC2, pmc_sample_period(sample_period));
	mtspr(SPRN_PMC3, pmc_sample_period(sample_period));
	mtspr(SPRN_PMC4, pmc_sample_period(sample_period));
	mtspr(SPRN_PMC5, pmc_sample_period(sample_period));
	mtspr(SPRN_PMC6, pmc_sample_period(sample_period));

	while (ebb_state.stats.ebb_count < 50) {
		FAIL_IF(core_busy_loop());
		FAIL_IF(ebb_check_mmcr0());
	}

	ebb_global_disable();
	ebb_freeze_pmcs();

	dump_ebb_state();

	for (i = 0; i < 6; i++)
		event_close(&events[i]);

	FAIL_IF(ebb_state.stats.ebb_count == 0);

	return 0;
}

int main(void)
{
	return test_harness(multi_counter, "multi_counter");
}

Annotation

Implementation Notes