summaryrefslogtreecommitdiffstats
path: root/tools/testing/selftests/user_events
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /tools/testing/selftests/user_events
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tools/testing/selftests/user_events')
-rw-r--r--tools/testing/selftests/user_events/Makefile9
-rw-r--r--tools/testing/selftests/user_events/dyn_test.c130
-rw-r--r--tools/testing/selftests/user_events/ftrace_test.c488
-rw-r--r--tools/testing/selftests/user_events/perf_test.c173
-rw-r--r--tools/testing/selftests/user_events/settings1
5 files changed, 801 insertions, 0 deletions
diff --git a/tools/testing/selftests/user_events/Makefile b/tools/testing/selftests/user_events/Makefile
new file mode 100644
index 000000000..87d54c640
--- /dev/null
+++ b/tools/testing/selftests/user_events/Makefile
@@ -0,0 +1,9 @@
+# SPDX-License-Identifier: GPL-2.0
+CFLAGS += -Wl,-no-as-needed -Wall $(KHDR_INCLUDES)
+LDLIBS += -lrt -lpthread -lm
+
+TEST_GEN_PROGS = ftrace_test dyn_test perf_test
+
+TEST_FILES := settings
+
+include ../lib.mk
diff --git a/tools/testing/selftests/user_events/dyn_test.c b/tools/testing/selftests/user_events/dyn_test.c
new file mode 100644
index 000000000..d6265d14c
--- /dev/null
+++ b/tools/testing/selftests/user_events/dyn_test.c
@@ -0,0 +1,130 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * User Events Dyn Events Test Program
+ *
+ * Copyright (c) 2021 Beau Belgrave <beaub@linux.microsoft.com>
+ */
+
+#include <errno.h>
+#include <linux/user_events.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#include "../kselftest_harness.h"
+
+const char *dyn_file = "/sys/kernel/debug/tracing/dynamic_events";
+const char *clear = "!u:__test_event";
+
+static int Append(const char *value)
+{
+ int fd = open(dyn_file, O_RDWR | O_APPEND);
+ int ret = write(fd, value, strlen(value));
+
+ close(fd);
+ return ret;
+}
+
+#define CLEAR() \
+do { \
+ int ret = Append(clear); \
+ if (ret == -1) \
+ ASSERT_EQ(ENOENT, errno); \
+} while (0)
+
+#define TEST_PARSE(x) \
+do { \
+ ASSERT_NE(-1, Append(x)); \
+ CLEAR(); \
+} while (0)
+
+#define TEST_NPARSE(x) ASSERT_EQ(-1, Append(x))
+
+FIXTURE(user) {
+};
+
+FIXTURE_SETUP(user) {
+ CLEAR();
+}
+
+FIXTURE_TEARDOWN(user) {
+ CLEAR();
+}
+
+TEST_F(user, basic_types) {
+ /* All should work */
+ TEST_PARSE("u:__test_event u64 a");
+ TEST_PARSE("u:__test_event u32 a");
+ TEST_PARSE("u:__test_event u16 a");
+ TEST_PARSE("u:__test_event u8 a");
+ TEST_PARSE("u:__test_event char a");
+ TEST_PARSE("u:__test_event unsigned char a");
+ TEST_PARSE("u:__test_event int a");
+ TEST_PARSE("u:__test_event unsigned int a");
+ TEST_PARSE("u:__test_event short a");
+ TEST_PARSE("u:__test_event unsigned short a");
+ TEST_PARSE("u:__test_event char[20] a");
+ TEST_PARSE("u:__test_event unsigned char[20] a");
+ TEST_PARSE("u:__test_event char[0x14] a");
+ TEST_PARSE("u:__test_event unsigned char[0x14] a");
+ /* Bad size format should fail */
+ TEST_NPARSE("u:__test_event char[aa] a");
+ /* Large size should fail */
+ TEST_NPARSE("u:__test_event char[9999] a");
+ /* Long size string should fail */
+ TEST_NPARSE("u:__test_event char[0x0000000000001] a");
+}
+
+TEST_F(user, loc_types) {
+ /* All should work */
+ TEST_PARSE("u:__test_event __data_loc char[] a");
+ TEST_PARSE("u:__test_event __data_loc unsigned char[] a");
+ TEST_PARSE("u:__test_event __rel_loc char[] a");
+ TEST_PARSE("u:__test_event __rel_loc unsigned char[] a");
+}
+
+TEST_F(user, size_types) {
+ /* Should work */
+ TEST_PARSE("u:__test_event struct custom a 20");
+ /* Size not specified on struct should fail */
+ TEST_NPARSE("u:__test_event struct custom a");
+ /* Size specified on non-struct should fail */
+ TEST_NPARSE("u:__test_event char a 20");
+}
+
+TEST_F(user, flags) {
+ /* Should work */
+ TEST_PARSE("u:__test_event:BPF_ITER u32 a");
+ /* Forward compat */
+ TEST_PARSE("u:__test_event:BPF_ITER,FLAG_FUTURE u32 a");
+}
+
+TEST_F(user, matching) {
+ /* Register */
+ ASSERT_NE(-1, Append("u:__test_event struct custom a 20"));
+ /* Should not match */
+ TEST_NPARSE("!u:__test_event struct custom b");
+ /* Should match */
+ TEST_PARSE("!u:__test_event struct custom a");
+ /* Multi field reg */
+ ASSERT_NE(-1, Append("u:__test_event u32 a; u32 b"));
+ /* Non matching cases */
+ TEST_NPARSE("!u:__test_event u32 a");
+ TEST_NPARSE("!u:__test_event u32 b");
+ TEST_NPARSE("!u:__test_event u32 a; u32 ");
+ TEST_NPARSE("!u:__test_event u32 a; u32 a");
+ /* Matching case */
+ TEST_PARSE("!u:__test_event u32 a; u32 b");
+ /* Register */
+ ASSERT_NE(-1, Append("u:__test_event u32 a; u32 b"));
+ /* Ensure trailing semi-colon case */
+ TEST_PARSE("!u:__test_event u32 a; u32 b;");
+}
+
+int main(int argc, char **argv)
+{
+ return test_harness_run(argc, argv);
+}
diff --git a/tools/testing/selftests/user_events/ftrace_test.c b/tools/testing/selftests/user_events/ftrace_test.c
new file mode 100644
index 000000000..1bc26e647
--- /dev/null
+++ b/tools/testing/selftests/user_events/ftrace_test.c
@@ -0,0 +1,488 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * User Events FTrace Test Program
+ *
+ * Copyright (c) 2021 Beau Belgrave <beaub@linux.microsoft.com>
+ */
+
+#include <errno.h>
+#include <linux/user_events.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#include "../kselftest_harness.h"
+
+const char *data_file = "/sys/kernel/debug/tracing/user_events_data";
+const char *status_file = "/sys/kernel/debug/tracing/user_events_status";
+const char *enable_file = "/sys/kernel/debug/tracing/events/user_events/__test_event/enable";
+const char *trace_file = "/sys/kernel/debug/tracing/trace";
+const char *fmt_file = "/sys/kernel/debug/tracing/events/user_events/__test_event/format";
+
+static inline int status_check(char *status_page, int status_bit)
+{
+ return status_page[status_bit >> 3] & (1 << (status_bit & 7));
+}
+
+static int trace_bytes(void)
+{
+ int fd = open(trace_file, O_RDONLY);
+ char buf[256];
+ int bytes = 0, got;
+
+ if (fd == -1)
+ return -1;
+
+ while (true) {
+ got = read(fd, buf, sizeof(buf));
+
+ if (got == -1)
+ return -1;
+
+ if (got == 0)
+ break;
+
+ bytes += got;
+ }
+
+ close(fd);
+
+ return bytes;
+}
+
+static int skip_until_empty_line(FILE *fp)
+{
+ int c, last = 0;
+
+ while (true) {
+ c = getc(fp);
+
+ if (c == EOF)
+ break;
+
+ if (last == '\n' && c == '\n')
+ return 0;
+
+ last = c;
+ }
+
+ return -1;
+}
+
+static int get_print_fmt(char *buffer, int len)
+{
+ FILE *fp = fopen(fmt_file, "r");
+ char *newline;
+
+ if (!fp)
+ return -1;
+
+ /* Read until empty line (Skip Common) */
+ if (skip_until_empty_line(fp) < 0)
+ goto err;
+
+ /* Read until empty line (Skip Properties) */
+ if (skip_until_empty_line(fp) < 0)
+ goto err;
+
+ /* Read in print_fmt: */
+ if (fgets(buffer, len, fp) == NULL)
+ goto err;
+
+ newline = strchr(buffer, '\n');
+
+ if (newline)
+ *newline = '\0';
+
+ fclose(fp);
+
+ return 0;
+err:
+ fclose(fp);
+
+ return -1;
+}
+
+static int clear(void)
+{
+ int fd = open(data_file, O_RDWR);
+
+ if (fd == -1)
+ return -1;
+
+ if (ioctl(fd, DIAG_IOCSDEL, "__test_event") == -1)
+ if (errno != ENOENT)
+ return -1;
+
+ close(fd);
+
+ return 0;
+}
+
+static int check_print_fmt(const char *event, const char *expected)
+{
+ struct user_reg reg = {0};
+ char print_fmt[256];
+ int ret;
+ int fd;
+
+ /* Ensure cleared */
+ ret = clear();
+
+ if (ret != 0)
+ return ret;
+
+ fd = open(data_file, O_RDWR);
+
+ if (fd == -1)
+ return fd;
+
+ reg.size = sizeof(reg);
+ reg.name_args = (__u64)event;
+
+ /* Register should work */
+ ret = ioctl(fd, DIAG_IOCSREG, &reg);
+
+ close(fd);
+
+ if (ret != 0)
+ return ret;
+
+ /* Ensure correct print_fmt */
+ ret = get_print_fmt(print_fmt, sizeof(print_fmt));
+
+ if (ret != 0)
+ return ret;
+
+ return strcmp(print_fmt, expected);
+}
+
+FIXTURE(user) {
+ int status_fd;
+ int data_fd;
+ int enable_fd;
+};
+
+FIXTURE_SETUP(user) {
+ self->status_fd = open(status_file, O_RDONLY);
+ ASSERT_NE(-1, self->status_fd);
+
+ self->data_fd = open(data_file, O_RDWR);
+ ASSERT_NE(-1, self->data_fd);
+
+ self->enable_fd = -1;
+}
+
+FIXTURE_TEARDOWN(user) {
+ close(self->status_fd);
+ close(self->data_fd);
+
+ if (self->enable_fd != -1) {
+ write(self->enable_fd, "0", sizeof("0"));
+ close(self->enable_fd);
+ }
+
+ ASSERT_EQ(0, clear());
+}
+
+TEST_F(user, register_events) {
+ struct user_reg reg = {0};
+ int page_size = sysconf(_SC_PAGESIZE);
+ char *status_page;
+
+ reg.size = sizeof(reg);
+ reg.name_args = (__u64)"__test_event u32 field1; u32 field2";
+
+ status_page = mmap(NULL, page_size, PROT_READ, MAP_SHARED,
+ self->status_fd, 0);
+
+ /* Register should work */
+ ASSERT_EQ(0, ioctl(self->data_fd, DIAG_IOCSREG, &reg));
+ ASSERT_EQ(0, reg.write_index);
+ ASSERT_NE(0, reg.status_bit);
+
+ /* Multiple registers should result in same index */
+ ASSERT_EQ(0, ioctl(self->data_fd, DIAG_IOCSREG, &reg));
+ ASSERT_EQ(0, reg.write_index);
+ ASSERT_NE(0, reg.status_bit);
+
+ /* Ensure disabled */
+ self->enable_fd = open(enable_file, O_RDWR);
+ ASSERT_NE(-1, self->enable_fd);
+ ASSERT_NE(-1, write(self->enable_fd, "0", sizeof("0")))
+
+ /* MMAP should work and be zero'd */
+ ASSERT_NE(MAP_FAILED, status_page);
+ ASSERT_NE(NULL, status_page);
+ ASSERT_EQ(0, status_check(status_page, reg.status_bit));
+
+ /* Enable event and ensure bits updated in status */
+ ASSERT_NE(-1, write(self->enable_fd, "1", sizeof("1")))
+ ASSERT_NE(0, status_check(status_page, reg.status_bit));
+
+ /* Disable event and ensure bits updated in status */
+ ASSERT_NE(-1, write(self->enable_fd, "0", sizeof("0")))
+ ASSERT_EQ(0, status_check(status_page, reg.status_bit));
+
+ /* File still open should return -EBUSY for delete */
+ ASSERT_EQ(-1, ioctl(self->data_fd, DIAG_IOCSDEL, "__test_event"));
+ ASSERT_EQ(EBUSY, errno);
+
+ /* Delete should work only after close */
+ close(self->data_fd);
+ self->data_fd = open(data_file, O_RDWR);
+ ASSERT_EQ(0, ioctl(self->data_fd, DIAG_IOCSDEL, "__test_event"));
+
+ /* Unmap should work */
+ ASSERT_EQ(0, munmap(status_page, page_size));
+}
+
+TEST_F(user, write_events) {
+ struct user_reg reg = {0};
+ struct iovec io[3];
+ __u32 field1, field2;
+ int before = 0, after = 0;
+ int page_size = sysconf(_SC_PAGESIZE);
+ char *status_page;
+
+ reg.size = sizeof(reg);
+ reg.name_args = (__u64)"__test_event u32 field1; u32 field2";
+
+ field1 = 1;
+ field2 = 2;
+
+ io[0].iov_base = &reg.write_index;
+ io[0].iov_len = sizeof(reg.write_index);
+ io[1].iov_base = &field1;
+ io[1].iov_len = sizeof(field1);
+ io[2].iov_base = &field2;
+ io[2].iov_len = sizeof(field2);
+
+ status_page = mmap(NULL, page_size, PROT_READ, MAP_SHARED,
+ self->status_fd, 0);
+
+ /* Register should work */
+ ASSERT_EQ(0, ioctl(self->data_fd, DIAG_IOCSREG, &reg));
+ ASSERT_EQ(0, reg.write_index);
+ ASSERT_NE(0, reg.status_bit);
+
+ /* MMAP should work and be zero'd */
+ ASSERT_NE(MAP_FAILED, status_page);
+ ASSERT_NE(NULL, status_page);
+ ASSERT_EQ(0, status_check(status_page, reg.status_bit));
+
+ /* Write should fail on invalid slot with ENOENT */
+ io[0].iov_base = &field2;
+ io[0].iov_len = sizeof(field2);
+ ASSERT_EQ(-1, writev(self->data_fd, (const struct iovec *)io, 3));
+ ASSERT_EQ(ENOENT, errno);
+ io[0].iov_base = &reg.write_index;
+ io[0].iov_len = sizeof(reg.write_index);
+
+ /* Enable event */
+ self->enable_fd = open(enable_file, O_RDWR);
+ ASSERT_NE(-1, write(self->enable_fd, "1", sizeof("1")))
+
+ /* Event should now be enabled */
+ ASSERT_NE(0, status_check(status_page, reg.status_bit));
+
+ /* Write should make it out to ftrace buffers */
+ before = trace_bytes();
+ ASSERT_NE(-1, writev(self->data_fd, (const struct iovec *)io, 3));
+ after = trace_bytes();
+ ASSERT_GT(after, before);
+
+ /* Negative index should fail with EINVAL */
+ reg.write_index = -1;
+ ASSERT_EQ(-1, writev(self->data_fd, (const struct iovec *)io, 3));
+ ASSERT_EQ(EINVAL, errno);
+}
+
+TEST_F(user, write_fault) {
+ struct user_reg reg = {0};
+ struct iovec io[2];
+ int l = sizeof(__u64);
+ void *anon;
+
+ reg.size = sizeof(reg);
+ reg.name_args = (__u64)"__test_event u64 anon";
+
+ anon = mmap(NULL, l, PROT_READ, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+ ASSERT_NE(MAP_FAILED, anon);
+
+ io[0].iov_base = &reg.write_index;
+ io[0].iov_len = sizeof(reg.write_index);
+ io[1].iov_base = anon;
+ io[1].iov_len = l;
+
+ /* Register should work */
+ ASSERT_EQ(0, ioctl(self->data_fd, DIAG_IOCSREG, &reg));
+ ASSERT_EQ(0, reg.write_index);
+ ASSERT_NE(0, reg.status_bit);
+
+ /* Write should work normally */
+ ASSERT_NE(-1, writev(self->data_fd, (const struct iovec *)io, 2));
+
+ /* Faulted data should zero fill and work */
+ ASSERT_EQ(0, madvise(anon, l, MADV_DONTNEED));
+ ASSERT_NE(-1, writev(self->data_fd, (const struct iovec *)io, 2));
+ ASSERT_EQ(0, munmap(anon, l));
+}
+
+TEST_F(user, write_validator) {
+ struct user_reg reg = {0};
+ struct iovec io[3];
+ int loc, bytes;
+ char data[8];
+ int before = 0, after = 0;
+ int page_size = sysconf(_SC_PAGESIZE);
+ char *status_page;
+
+ status_page = mmap(NULL, page_size, PROT_READ, MAP_SHARED,
+ self->status_fd, 0);
+
+ reg.size = sizeof(reg);
+ reg.name_args = (__u64)"__test_event __rel_loc char[] data";
+
+ /* Register should work */
+ ASSERT_EQ(0, ioctl(self->data_fd, DIAG_IOCSREG, &reg));
+ ASSERT_EQ(0, reg.write_index);
+ ASSERT_NE(0, reg.status_bit);
+
+ /* MMAP should work and be zero'd */
+ ASSERT_NE(MAP_FAILED, status_page);
+ ASSERT_NE(NULL, status_page);
+ ASSERT_EQ(0, status_check(status_page, reg.status_bit));
+
+ io[0].iov_base = &reg.write_index;
+ io[0].iov_len = sizeof(reg.write_index);
+ io[1].iov_base = &loc;
+ io[1].iov_len = sizeof(loc);
+ io[2].iov_base = data;
+ bytes = snprintf(data, sizeof(data), "Test") + 1;
+ io[2].iov_len = bytes;
+
+ /* Undersized write should fail */
+ ASSERT_EQ(-1, writev(self->data_fd, (const struct iovec *)io, 1));
+ ASSERT_EQ(EINVAL, errno);
+
+ /* Enable event */
+ self->enable_fd = open(enable_file, O_RDWR);
+ ASSERT_NE(-1, write(self->enable_fd, "1", sizeof("1")))
+
+ /* Event should now be enabled */
+ ASSERT_NE(0, status_check(status_page, reg.status_bit));
+
+ /* Full in-bounds write should work */
+ before = trace_bytes();
+ loc = DYN_LOC(0, bytes);
+ ASSERT_NE(-1, writev(self->data_fd, (const struct iovec *)io, 3));
+ after = trace_bytes();
+ ASSERT_GT(after, before);
+
+ /* Out of bounds write should fault (offset way out) */
+ loc = DYN_LOC(1024, bytes);
+ ASSERT_EQ(-1, writev(self->data_fd, (const struct iovec *)io, 3));
+ ASSERT_EQ(EFAULT, errno);
+
+ /* Out of bounds write should fault (offset 1 byte out) */
+ loc = DYN_LOC(1, bytes);
+ ASSERT_EQ(-1, writev(self->data_fd, (const struct iovec *)io, 3));
+ ASSERT_EQ(EFAULT, errno);
+
+ /* Out of bounds write should fault (size way out) */
+ loc = DYN_LOC(0, bytes + 1024);
+ ASSERT_EQ(-1, writev(self->data_fd, (const struct iovec *)io, 3));
+ ASSERT_EQ(EFAULT, errno);
+
+ /* Out of bounds write should fault (size 1 byte out) */
+ loc = DYN_LOC(0, bytes + 1);
+ ASSERT_EQ(-1, writev(self->data_fd, (const struct iovec *)io, 3));
+ ASSERT_EQ(EFAULT, errno);
+
+ /* Non-Null should fault */
+ memset(data, 'A', sizeof(data));
+ loc = DYN_LOC(0, bytes);
+ ASSERT_EQ(-1, writev(self->data_fd, (const struct iovec *)io, 3));
+ ASSERT_EQ(EFAULT, errno);
+}
+
+TEST_F(user, print_fmt) {
+ int ret;
+
+ ret = check_print_fmt("__test_event __rel_loc char[] data",
+ "print fmt: \"data=%s\", __get_rel_str(data)");
+ ASSERT_EQ(0, ret);
+
+ ret = check_print_fmt("__test_event __data_loc char[] data",
+ "print fmt: \"data=%s\", __get_str(data)");
+ ASSERT_EQ(0, ret);
+
+ ret = check_print_fmt("__test_event s64 data",
+ "print fmt: \"data=%lld\", REC->data");
+ ASSERT_EQ(0, ret);
+
+ ret = check_print_fmt("__test_event u64 data",
+ "print fmt: \"data=%llu\", REC->data");
+ ASSERT_EQ(0, ret);
+
+ ret = check_print_fmt("__test_event s32 data",
+ "print fmt: \"data=%d\", REC->data");
+ ASSERT_EQ(0, ret);
+
+ ret = check_print_fmt("__test_event u32 data",
+ "print fmt: \"data=%u\", REC->data");
+ ASSERT_EQ(0, ret);
+
+ ret = check_print_fmt("__test_event int data",
+ "print fmt: \"data=%d\", REC->data");
+ ASSERT_EQ(0, ret);
+
+ ret = check_print_fmt("__test_event unsigned int data",
+ "print fmt: \"data=%u\", REC->data");
+ ASSERT_EQ(0, ret);
+
+ ret = check_print_fmt("__test_event s16 data",
+ "print fmt: \"data=%d\", REC->data");
+ ASSERT_EQ(0, ret);
+
+ ret = check_print_fmt("__test_event u16 data",
+ "print fmt: \"data=%u\", REC->data");
+ ASSERT_EQ(0, ret);
+
+ ret = check_print_fmt("__test_event short data",
+ "print fmt: \"data=%d\", REC->data");
+ ASSERT_EQ(0, ret);
+
+ ret = check_print_fmt("__test_event unsigned short data",
+ "print fmt: \"data=%u\", REC->data");
+ ASSERT_EQ(0, ret);
+
+ ret = check_print_fmt("__test_event s8 data",
+ "print fmt: \"data=%d\", REC->data");
+ ASSERT_EQ(0, ret);
+
+ ret = check_print_fmt("__test_event u8 data",
+ "print fmt: \"data=%u\", REC->data");
+ ASSERT_EQ(0, ret);
+
+ ret = check_print_fmt("__test_event char data",
+ "print fmt: \"data=%d\", REC->data");
+ ASSERT_EQ(0, ret);
+
+ ret = check_print_fmt("__test_event unsigned char data",
+ "print fmt: \"data=%u\", REC->data");
+ ASSERT_EQ(0, ret);
+
+ ret = check_print_fmt("__test_event char[4] data",
+ "print fmt: \"data=%s\", REC->data");
+ ASSERT_EQ(0, ret);
+}
+
+int main(int argc, char **argv)
+{
+ return test_harness_run(argc, argv);
+}
diff --git a/tools/testing/selftests/user_events/perf_test.c b/tools/testing/selftests/user_events/perf_test.c
new file mode 100644
index 000000000..8b4c7879d
--- /dev/null
+++ b/tools/testing/selftests/user_events/perf_test.c
@@ -0,0 +1,173 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * User Events Perf Events Test Program
+ *
+ * Copyright (c) 2021 Beau Belgrave <beaub@linux.microsoft.com>
+ */
+
+#include <errno.h>
+#include <linux/user_events.h>
+#include <linux/perf_event.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <asm/unistd.h>
+
+#include "../kselftest_harness.h"
+
+const char *data_file = "/sys/kernel/debug/tracing/user_events_data";
+const char *status_file = "/sys/kernel/debug/tracing/user_events_status";
+const char *id_file = "/sys/kernel/debug/tracing/events/user_events/__test_event/id";
+const char *fmt_file = "/sys/kernel/debug/tracing/events/user_events/__test_event/format";
+
+struct event {
+ __u32 index;
+ __u32 field1;
+ __u32 field2;
+};
+
+static long perf_event_open(struct perf_event_attr *pe, pid_t pid,
+ int cpu, int group_fd, unsigned long flags)
+{
+ return syscall(__NR_perf_event_open, pe, pid, cpu, group_fd, flags);
+}
+
+static inline int status_check(char *status_page, int status_bit)
+{
+ return status_page[status_bit >> 3] & (1 << (status_bit & 7));
+}
+
+static int get_id(void)
+{
+ FILE *fp = fopen(id_file, "r");
+ int ret, id = 0;
+
+ if (!fp)
+ return -1;
+
+ ret = fscanf(fp, "%d", &id);
+ fclose(fp);
+
+ if (ret != 1)
+ return -1;
+
+ return id;
+}
+
+static int get_offset(void)
+{
+ FILE *fp = fopen(fmt_file, "r");
+ int ret, c, last = 0, offset = 0;
+
+ if (!fp)
+ return -1;
+
+ /* Read until empty line */
+ while (true) {
+ c = getc(fp);
+
+ if (c == EOF)
+ break;
+
+ if (last == '\n' && c == '\n')
+ break;
+
+ last = c;
+ }
+
+ ret = fscanf(fp, "\tfield:u32 field1;\toffset:%d;", &offset);
+ fclose(fp);
+
+ if (ret != 1)
+ return -1;
+
+ return offset;
+}
+
+FIXTURE(user) {
+ int status_fd;
+ int data_fd;
+};
+
+FIXTURE_SETUP(user) {
+ self->status_fd = open(status_file, O_RDONLY);
+ ASSERT_NE(-1, self->status_fd);
+
+ self->data_fd = open(data_file, O_RDWR);
+ ASSERT_NE(-1, self->data_fd);
+}
+
+FIXTURE_TEARDOWN(user) {
+ close(self->status_fd);
+ close(self->data_fd);
+}
+
+TEST_F(user, perf_write) {
+ struct perf_event_attr pe = {0};
+ struct user_reg reg = {0};
+ int page_size = sysconf(_SC_PAGESIZE);
+ char *status_page;
+ struct event event;
+ struct perf_event_mmap_page *perf_page;
+ int id, fd, offset;
+ __u32 *val;
+
+ reg.size = sizeof(reg);
+ reg.name_args = (__u64)"__test_event u32 field1; u32 field2";
+
+ status_page = mmap(NULL, page_size, PROT_READ, MAP_SHARED,
+ self->status_fd, 0);
+ ASSERT_NE(MAP_FAILED, status_page);
+
+ /* Register should work */
+ ASSERT_EQ(0, ioctl(self->data_fd, DIAG_IOCSREG, &reg));
+ ASSERT_EQ(0, reg.write_index);
+ ASSERT_NE(0, reg.status_bit);
+ ASSERT_EQ(0, status_check(status_page, reg.status_bit));
+
+ /* Id should be there */
+ id = get_id();
+ ASSERT_NE(-1, id);
+ offset = get_offset();
+ ASSERT_NE(-1, offset);
+
+ pe.type = PERF_TYPE_TRACEPOINT;
+ pe.size = sizeof(pe);
+ pe.config = id;
+ pe.sample_type = PERF_SAMPLE_RAW;
+ pe.sample_period = 1;
+ pe.wakeup_events = 1;
+
+ /* Tracepoint attach should work */
+ fd = perf_event_open(&pe, 0, -1, -1, 0);
+ ASSERT_NE(-1, fd);
+
+ perf_page = mmap(NULL, page_size * 2, PROT_READ, MAP_SHARED, fd, 0);
+ ASSERT_NE(MAP_FAILED, perf_page);
+
+ /* Status should be updated */
+ ASSERT_NE(0, status_check(status_page, reg.status_bit));
+
+ event.index = reg.write_index;
+ event.field1 = 0xc001;
+ event.field2 = 0xc01a;
+
+ /* Ensure write shows up at correct offset */
+ ASSERT_NE(-1, write(self->data_fd, &event, sizeof(event)));
+ val = (void *)(((char *)perf_page) + perf_page->data_offset);
+ ASSERT_EQ(PERF_RECORD_SAMPLE, *val);
+ /* Skip over header and size, move to offset */
+ val += 3;
+ val = (void *)((char *)val) + offset;
+ /* Ensure correct */
+ ASSERT_EQ(event.field1, *val++);
+ ASSERT_EQ(event.field2, *val++);
+}
+
+int main(int argc, char **argv)
+{
+ return test_harness_run(argc, argv);
+}
diff --git a/tools/testing/selftests/user_events/settings b/tools/testing/selftests/user_events/settings
new file mode 100644
index 000000000..ba4d85f74
--- /dev/null
+++ b/tools/testing/selftests/user_events/settings
@@ -0,0 +1 @@
+timeout=90