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128 lines
2.8 KiB
128 lines
2.8 KiB
// 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("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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