perf test: Delete unused Intel CQM test

As Ian Rogers <irogers@google.com> pointed out, intel-cqm.c is neither
used nor built. It was deleted in the following commit:

commit b24413180f56 ("License cleanup: add SPDX GPL-2.0 license identifier to files with no license")

However, it resurfaced soon after in the following commit:

commit 5c9295bfe6f5 ("perf tests: Remove Intel CQM perf test")

It should be deleted once and for all.

Suggested-by: Ian Rogers <irogers@google.com>
Signed-off-by: Howard Chu <howardchu95@gmail.com>
Reviewed-by: Ian Rogers <irogers@google.com>
Reviewed-by: Matt Fleming <mfleming@cloudflare.com>
Link: https://lore.kernel.org/r/20241011055700.4142694-1-howardchu95@gmail.com
Signed-off-by: Namhyung Kim <namhyung@kernel.org>

diff --git a/tools/perf/arch/x86/tests/intel-cqm.c b/tools/perf/arch/x86/tests/intel-cqm.c
deleted file mode 100644 (file)
index 360a082..0000000
--- a/tools/perf/arch/x86/tests/intel-cqm.c
+++ /dev/null
@@ -1,128 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-#include "tests/tests.h"
-#include "cloexec.h"
-#include "debug.h"
-#include "evlist.h"
-#include "evsel.h"
-#include "arch-tests.h"
-#include <internal/lib.h> // page_size
-
-#include <signal.h>
-#include <sys/mman.h>
-#include <sys/wait.h>
-#include <errno.h>
-#include <string.h>
-
-static pid_t spawn(void)
-{
-       pid_t pid;
-
-       pid = fork();
-       if (pid)
-               return pid;
-
-       while(1)
-               sleep(5);
-       return 0;
-}
-
-/*
- * Create an event group that contains both a sampled hardware
- * (cpu-cycles) and software (intel_cqm/llc_occupancy/) event. We then
- * wait for the hardware perf counter to overflow and generate a PMI,
- * which triggers an event read for both of the events in the group.
- *
- * Since reading Intel CQM event counters requires sending SMP IPIs, the
- * CQM pmu needs to handle the above situation gracefully, and return
- * the last read counter value to avoid triggering a WARN_ON_ONCE() in
- * smp_call_function_many() caused by sending IPIs from NMI context.
- */
-int test__intel_cqm_count_nmi_context(struct test_suite *test __maybe_unused, int subtest __maybe_unused)
-{
-       struct evlist *evlist = NULL;
-       struct evsel *evsel = NULL;
-       struct perf_event_attr pe;
-       int i, fd[2], flag, ret;
-       size_t mmap_len;
-       void *event;
-       pid_t pid;
-       int err = TEST_FAIL;
-
-       flag = perf_event_open_cloexec_flag();
-
-       evlist = evlist__new();
-       if (!evlist) {
-               pr_debug("evlist__new failed\n");
-               return TEST_FAIL;
-       }
-
-       ret = parse_event(evlist, "intel_cqm/llc_occupancy/");
-       if (ret) {
-               pr_debug("parse_events failed, is \"intel_cqm/llc_occupancy/\" available?\n");
-               err = TEST_SKIP;
-               goto out;
-       }
-
-       evsel = evlist__first(evlist);
-       if (!evsel) {
-               pr_debug("evlist__first failed\n");
-               goto out;
-       }
-
-       memset(&pe, 0, sizeof(pe));
-       pe.size = sizeof(pe);
-
-       pe.type = PERF_TYPE_HARDWARE;
-       pe.config = PERF_COUNT_HW_CPU_CYCLES;
-       pe.read_format = PERF_FORMAT_GROUP;
-
-       pe.sample_period = 128;
-       pe.sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_READ;
-
-       pid = spawn();
-
-       fd[0] = sys_perf_event_open(&pe, pid, -1, -1, flag);
-       if (fd[0] < 0) {
-               pr_debug("failed to open event\n");
-               goto out;
-       }
-
-       memset(&pe, 0, sizeof(pe));
-       pe.size = sizeof(pe);
-
-       pe.type = evsel->attr.type;
-       pe.config = evsel->attr.config;
-
-       fd[1] = sys_perf_event_open(&pe, pid, -1, fd[0], flag);
-       if (fd[1] < 0) {
-               pr_debug("failed to open event\n");
-               goto out;
-       }
-
-       /*
-        * Pick a power-of-two number of pages + 1 for the meta-data
-        * page (struct perf_event_mmap_page). See tools/perf/design.txt.
-        */
-       mmap_len = page_size * 65;
-
-       event = mmap(NULL, mmap_len, PROT_READ, MAP_SHARED, fd[0], 0);
-       if (event == (void *)(-1)) {
-               pr_debug("failed to mmap %d\n", errno);
-               goto out;
-       }
-
-       sleep(1);
-
-       err = TEST_OK;
-
-       munmap(event, mmap_len);
-
-       for (i = 0; i < 2; i++)
-               close(fd[i]);
-
-       kill(pid, SIGKILL);
-       wait(NULL);
-out:
-       evlist__delete(evlist);
-       return err;
-}