// SPDX-License-Identifier: GPL-2.0
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#include "tests/tests.h"
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#include "cloexec.h"
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#include "debug.h"
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#include "evlist.h"
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#include "evsel.h"
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#include "arch-tests.h"
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#include <internal/lib.h> // page_size
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#include <signal.h>
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#include <sys/mman.h>
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#include <sys/wait.h>
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#include <errno.h>
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#include <string.h>
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static pid_t spawn(void)
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{
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pid_t pid;
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pid = fork();
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if (pid)
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return pid;
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while(1)
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sleep(5);
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return 0;
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}
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/*
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* Create an event group that contains both a sampled hardware
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* (cpu-cycles) and software (intel_cqm/llc_occupancy/) event. We then
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* wait for the hardware perf counter to overflow and generate a PMI,
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* which triggers an event read for both of the events in the group.
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*
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* Since reading Intel CQM event counters requires sending SMP IPIs, the
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* CQM pmu needs to handle the above situation gracefully, and return
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* the last read counter value to avoid triggering a WARN_ON_ONCE() in
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* smp_call_function_many() caused by sending IPIs from NMI context.
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*/
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int test__intel_cqm_count_nmi_context(struct test *test __maybe_unused, int subtest __maybe_unused)
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{
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struct evlist *evlist = NULL;
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struct evsel *evsel = NULL;
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struct perf_event_attr pe;
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int i, fd[2], flag, ret;
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size_t mmap_len;
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void *event;
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pid_t pid;
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int err = TEST_FAIL;
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flag = perf_event_open_cloexec_flag();
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evlist = evlist__new();
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if (!evlist) {
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pr_debug("perf_evlist__new failed\n");
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return TEST_FAIL;
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}
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ret = parse_events(evlist, "intel_cqm/llc_occupancy/", NULL);
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if (ret) {
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pr_debug("parse_events failed, is \"intel_cqm/llc_occupancy/\" available?\n");
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err = TEST_SKIP;
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goto out;
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}
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evsel = evlist__first(evlist);
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if (!evsel) {
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pr_debug("evlist__first failed\n");
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goto out;
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}
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memset(&pe, 0, sizeof(pe));
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pe.size = sizeof(pe);
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pe.type = PERF_TYPE_HARDWARE;
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pe.config = PERF_COUNT_HW_CPU_CYCLES;
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pe.read_format = PERF_FORMAT_GROUP;
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pe.sample_period = 128;
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pe.sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_READ;
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pid = spawn();
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fd[0] = sys_perf_event_open(&pe, pid, -1, -1, flag);
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if (fd[0] < 0) {
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pr_debug("failed to open event\n");
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goto out;
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}
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memset(&pe, 0, sizeof(pe));
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pe.size = sizeof(pe);
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pe.type = evsel->attr.type;
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pe.config = evsel->attr.config;
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fd[1] = sys_perf_event_open(&pe, pid, -1, fd[0], flag);
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if (fd[1] < 0) {
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pr_debug("failed to open event\n");
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goto out;
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}
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/*
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* Pick a power-of-two number of pages + 1 for the meta-data
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* page (struct perf_event_mmap_page). See tools/perf/design.txt.
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*/
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mmap_len = page_size * 65;
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event = mmap(NULL, mmap_len, PROT_READ, MAP_SHARED, fd[0], 0);
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if (event == (void *)(-1)) {
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pr_debug("failed to mmap %d\n", errno);
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goto out;
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}
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sleep(1);
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err = TEST_OK;
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munmap(event, mmap_len);
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for (i = 0; i < 2; i++)
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close(fd[i]);
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kill(pid, SIGKILL);
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wait(NULL);
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out:
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evlist__delete(evlist);
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return err;
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}
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