These changes are the raw update to linux-4.4.6-rt14. Kernel sources

[kvmfornfv.git] / kernel / tools / perf / arch / x86 / tests / intel-cqm.c

diff --git a/kernel/tools/perf/arch/x86/tests/intel-cqm.c b/kernel/tools/perf/arch/x86/tests/intel-cqm.c
new file mode 100644 (file)
index 0000000..d28c1b6
--- /dev/null
+++ b/kernel/tools/perf/arch/x86/tests/intel-cqm.c
@@ -0,0 +1,124 @@
+#include "tests/tests.h"
+#include "perf.h"
+#include "cloexec.h"
+#include "debug.h"
+#include "evlist.h"
+#include "evsel.h"
+#include "arch-tests.h"
+
+#include <sys/mman.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(void)
+{
+       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\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;
+}