perf tests: Remove Intel CQM perf test

Intel CQM perf test is obsolete for perf PMU code has been removed in
commit c39a0e2c88 ("x86/perf/cqm: Wipe out perf based cqm").

Signed-off-by: Xiaochen Shen <xiaochen.shen@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Pei P Jia <pei.p.jia@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Vikas Shivappa <vikas.shivappa@linux.intel.com>
Link: http://lkml.kernel.org/r/1505797057-16300-1-git-send-email-xiaochen.shen@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/arch/x86/include/arch-tests.h

@@ -8,7 +8,6 @@ struct test;
 int test__rdpmc(struct test *test __maybe_unused, int subtest);
 int test__perf_time_to_tsc(struct test *test __maybe_unused, int subtest);
 int test__insn_x86(struct test *test __maybe_unused, int subtest);
-int test__intel_cqm_count_nmi_context(struct test *test __maybe_unused, int subtest);
 
 #ifdef HAVE_DWARF_UNWIND_SUPPORT
 struct thread;

tools/perf/arch/x86/tests/Build

@@ -5,4 +5,3 @@ libperf-y += arch-tests.o
 libperf-y += rdpmc.o
 libperf-y += perf-time-to-tsc.o
 libperf-$(CONFIG_AUXTRACE) += insn-x86.o
-libperf-y += intel-cqm.o

tools/perf/arch/x86/tests/arch-tests.c

@@ -23,10 +23,6 @@ struct test arch_tests[] = {
 		.func = test__insn_x86,
 	},
 #endif
-	{
-		.desc = "Intel cqm nmi context read",
-		.func = test__intel_cqm_count_nmi_context,
-	},
 	{
 		.func = NULL,
 	},

tools/perf/arch/x86/tests/intel-cqm.c

@@ -1,127 +0,0 @@
-#include "tests/tests.h"
-#include "perf.h"
-#include "cloexec.h"
-#include "debug.h"
-#include "evlist.h"
-#include "evsel.h"
-#include "arch-tests.h"
-
-#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 *test __maybe_unused, int subtest __maybe_unused)
-{
-	struct perf_evlist *evlist = NULL;
-	struct perf_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 = perf_evlist__new();
-	if (!evlist) {
-		pr_debug("perf_evlist__new failed\n");
-		return TEST_FAIL;
-	}
-
-	ret = parse_events(evlist, "intel_cqm/llc_occupancy/", NULL);
-	if (ret) {
-		pr_debug("parse_events failed, is \"intel_cqm/llc_occupancy/\" available?\n");
-		err = TEST_SKIP;
-		goto out;
-	}
-
-	evsel = perf_evlist__first(evlist);
-	if (!evsel) {
-		pr_debug("perf_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:
-	perf_evlist__delete(evlist);
-	return err;
-}