[v10,07/12] user_events: Add self-test for ftrace integration

Message ID	20220118204326.2169-8-beaub@linux.microsoft.com (mailing list archive)
State	Accepted
Commit	446640e49ec00458655e29c31e55aabd6702985d
Headers	show Return-Path: <linux-trace-devel-owner@kernel.org> From: Beau Belgrave <beaub@linux.microsoft.com> To: rostedt@goodmis.org, mhiramat@kernel.org Cc: linux-trace-devel@vger.kernel.org, linux-kernel@vger.kernel.org, beaub@linux.microsoft.com Subject: [PATCH v10 07/12] user_events: Add self-test for ftrace integration Date: Tue, 18 Jan 2022 12:43:21 -0800 Message-Id: <20220118204326.2169-8-beaub@linux.microsoft.com> In-Reply-To: <20220118204326.2169-1-beaub@linux.microsoft.com> References: <20220118204326.2169-1-beaub@linux.microsoft.com> Precedence: bulk
Series	user_events: Enable user processes to create and write to trace events \| expand [v10,00/12] user_events: Enable user processes to create and write to trace events [v10,01/12] user_events: Add minimal support for trace_event into ftrace [v10,02/12] user_events: Add print_fmt generation support for basic types [v10,03/12] user_events: Handle matching arguments from dyn_events [v10,04/12] user_events: Add basic perf and eBPF support [v10,05/12] user_events: Optimize writing events by only copying data once [v10,06/12] user_events: Validate user payloads for size and null termination [v10,07/12] user_events: Add self-test for ftrace integration [v10,08/12] user_events: Add self-test for dynamic_events integration [v10,09/12] user_events: Add self-test for perf_event integration [v10,10/12] user_events: Add self-test for validator boundaries [v10,11/12] user_events: Add sample code for typical usage [v10,12/12] user_events: Add documentation file

diff --git a/tools/testing/selftests/user_events/Makefile b/tools/testing/selftests/user_events/Makefile new file mode 100644 index 000000000000..d66c551a6fe3 --- /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 -I../../../../usr/include +LDLIBS += -lrt -lpthread -lm + +TEST_GEN_PROGS = ftrace_test + +TEST_FILES := settings + +include ../lib.mk 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 000000000000..68010fd7b719 --- /dev/null +++ b/tools/testing/selftests/user_events/ftrace_test.c @@ -0,0 +1,387 @@ +// 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 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_index); + + /* 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_index); + + /* 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_page[reg.status_index]); + + /* Enable event and ensure bits updated in status */ + ASSERT_NE(-1, write(self->enable_fd, "1", sizeof("1"))) + ASSERT_EQ(EVENT_STATUS_FTRACE, status_page[reg.status_index]); + + /* Disable event and ensure bits updated in status */ + ASSERT_NE(-1, write(self->enable_fd, "0", sizeof("0"))) + ASSERT_EQ(0, status_page[reg.status_index]); + + /* 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; + + 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); + + /* Register should work */ + ASSERT_EQ(0, ioctl(self->data_fd, DIAG_IOCSREG, &reg)); + ASSERT_EQ(0, reg.write_index); + ASSERT_NE(0, reg.status_index); + + /* 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"))) + + /* 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); +} + +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_index); + + /* 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, 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/settings b/tools/testing/selftests/user_events/settings new file mode 100644 index 000000000000..ba4d85f74cd6 --- /dev/null +++ b/tools/testing/selftests/user_events/settings @@ -0,0 +1 @@ +timeout=90

[v10,07/12] user_events: Add self-test for ftrace integration

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