[LTP] [PATCH v4 ltp] Add Intel PT full trace mode basic test case
Ammy Yi
ammy.yi@intel.com
Tue Oct 9 07:11:49 CEST 2018
This test will do Intel PT full trace mode with test case PID to check
if enable/stop/trace generation works with Intel PT.
Signed-off-by: Ammy Yi <ammy.yi@intel.com>
---
runtest/tracing | 1 +
testcases/kernel/tracing/pt_test/.gitignore | 1 +
testcases/kernel/tracing/pt_test/Makefile | 21 ++++
testcases/kernel/tracing/pt_test/pt_test.c | 170 ++++++++++++++++++++++++++++
4 files changed, 193 insertions(+)
create mode 100644 testcases/kernel/tracing/pt_test/.gitignore
create mode 100644 testcases/kernel/tracing/pt_test/Makefile
create mode 100644 testcases/kernel/tracing/pt_test/pt_test.c
diff --git a/runtest/tracing b/runtest/tracing
index 8285eeb43..504132d70 100644
--- a/runtest/tracing
+++ b/runtest/tracing
@@ -3,3 +3,4 @@ ftrace_regression01 ftrace_regression01.sh
ftrace_regression02 ftrace_regression02.sh
ftrace-stress-test ftrace_stress_test.sh 90
dynamic_debug01 dynamic_debug01.sh
+pt_full_trace_basic pt_test
diff --git a/testcases/kernel/tracing/pt_test/.gitignore b/testcases/kernel/tracing/pt_test/.gitignore
new file mode 100644
index 000000000..96efc142d
--- /dev/null
+++ b/testcases/kernel/tracing/pt_test/.gitignore
@@ -0,0 +1 @@
+/pt_test
diff --git a/testcases/kernel/tracing/pt_test/Makefile b/testcases/kernel/tracing/pt_test/Makefile
new file mode 100644
index 000000000..a114fed1b
--- /dev/null
+++ b/testcases/kernel/tracing/pt_test/Makefile
@@ -0,0 +1,21 @@
+#
+# Copyright (C) 2018 Intel Corporation
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+#
+
+top_srcdir ?= ../../../..
+
+include $(top_srcdir)/include/mk/testcases.mk
+include $(top_srcdir)/include/mk/generic_leaf_target.mk
\ No newline at end of file
diff --git a/testcases/kernel/tracing/pt_test/pt_test.c b/testcases/kernel/tracing/pt_test/pt_test.c
new file mode 100644
index 000000000..bbd641b06
--- /dev/null
+++ b/testcases/kernel/tracing/pt_test/pt_test.c
@@ -0,0 +1,170 @@
+/*
+ * Copyright (C) 2018 Intel Corporation
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * author: Ammy Yi (ammy.yi@intel.com)
+ * date: 8/20/2018
+ */
+
+/*
+ * This test will check if Intel PT(Intel Processer Trace) full trace mode is
+ * working. It is only applied on X86 platforms.
+ */
+
+#include <linux/perf_event.h>
+#include <sched.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include "tst_test.h"
+#include "lapi/syscalls.h"
+
+#define PAGESIZE 4096
+#define INTEL_PT_MEMSIZE (17*PAGESIZE)
+
+#define BIT(nr) (1UL << (nr))
+
+#define INTEL_PT_PMU_TYPE "/sys/devices/intel_pt/type"
+#define INTEL_PT_FORMAT_TSC "/sys/devices/intel_pt/format/tsc"
+#define INTEL_PT_FORMAT_NRT "/sys/devices/intel_pt/format/noretcomp"
+
+//Intel PT event handle
+int fde = -1;
+//map head and size
+uint64_t **bufm;
+long buhsz;
+
+uint64_t **create_map(int fde, long bufsize)
+{
+ int PROTo;
+ uint64_t **buf_ev;
+ struct perf_event_mmap_page *pc;
+
+ buf_ev = SAFE_MALLOC(2*sizeof(uint64_t *));
+
+ PROTo = PROT_READ | PROT_WRITE;
+ buf_ev[0] = NULL;
+ buf_ev[1] = NULL;
+//try to mmap for trace
+ buf_ev[0] = SAFE_MMAP(NULL, INTEL_PT_MEMSIZE, PROT_READ | PROT_WRITE,
+ MAP_SHARED, fde, 0);
+
+ pc = (struct perf_event_mmap_page *)buf_ev[0];
+ pc->aux_offset = INTEL_PT_MEMSIZE;
+ pc->aux_size = bufsize;
+ buf_ev[1] = SAFE_MMAP(NULL, bufsize, PROTo,
+ MAP_SHARED, fde, INTEL_PT_MEMSIZE);
+ return buf_ev;
+}
+
+
+int intel_pt_pmu_value(char *dir)
+{
+ char *value;
+ int val = 0;
+ char delims[] = ":";
+
+ SAFE_FILE_SCANF(dir, "%m[^\n]", &value);
+ if (strstr(value, delims) == NULL) {
+ val = atoi(value);
+ } else {
+ strsep(&value, delims);
+ val = atoi(value);
+ }
+ return val;
+}
+
+void del_map(uint64_t **buf_ev, long bufsize)
+{
+ long pbuhsz;
+
+ pbuhsz = INTEL_PT_MEMSIZE;
+ if (buf_ev) {
+ if (buf_ev[0])
+ munmap(buf_ev[0], pbuhsz);
+ if (buf_ev[1])
+ munmap(buf_ev[1], bufsize);
+ }
+
+ free(buf_ev);
+}
+
+static void intel_pt_full_trace_check(void)
+{
+ uint64_t aux_head = 0;
+ struct perf_event_mmap_page *pmp;
+ /* enable tracing */
+ SAFE_IOCTL(fde, PERF_EVENT_IOC_RESET);
+ SAFE_IOCTL(fde, PERF_EVENT_IOC_ENABLE);
+
+ /* stop tracing */
+ SAFE_IOCTL(fde, PERF_EVENT_IOC_DISABLE);
+
+ // check if there is some trace generated
+ pmp = (struct perf_event_mmap_page *)bufm[0];
+ aux_head = *(volatile uint64_t *)&pmp->aux_head;
+ if (aux_head == 0) {
+ tst_res(TFAIL, "There is no trace, so failed!");
+ return;
+ }
+
+ tst_res(TPASS, "perf trace full mode is passed!");
+}
+
+void setup(void)
+{
+ struct perf_event_attr attr = {};
+
+ buhsz = 2 * PAGESIZE;
+
+ //set attr for Intel PT trace
+ attr.type = intel_pt_pmu_value(INTEL_PT_PMU_TYPE);
+ attr.read_format = PERF_FORMAT_ID | PERF_FORMAT_TOTAL_TIME_RUNNING |
+ PERF_FORMAT_TOTAL_TIME_ENABLED;
+ attr.disabled = 1;
+ attr.config = BIT(intel_pt_pmu_value(INTEL_PT_FORMAT_TSC)) |
+ BIT(intel_pt_pmu_value(INTEL_PT_FORMAT_NRT));
+ attr.size = sizeof(struct perf_event_attr);
+ attr.exclude_kernel = 0;
+ attr.exclude_user = 0;
+ attr.mmap = 1;
+
+ //only get trace for own pid
+ fde = tst_syscall(__NR_perf_event_open, &attr, 0, -1, -1, 0);
+ if (fde < 0) {
+ tst_res(TINFO, "Open Intel PT event failed!");
+ tst_res(TFAIL, "perf trace full mode is failed!");
+ return;
+ }
+ bufm = NULL;
+ /* allocate memory for trace */
+ bufm = create_map(fde, buhsz);
+
+}
+
+void cleanup(void)
+{
+ if (fde != -1)
+ close(fde);
+
+ del_map(bufm, buhsz);
+}
+
+static struct tst_test test = {
+ .test_all = intel_pt_full_trace_check,
+ .min_kver = "4.1",
+ .setup = setup,
+ .cleanup = cleanup,
+ .needs_root = 1,
+};
--
2.14.1
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