From patchwork Fri Feb 2 18:44:48 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Beau Belgrave X-Patchwork-Id: 13543292 Received: from linux.microsoft.com (linux.microsoft.com [13.77.154.182]) by smtp.subspace.kernel.org (Postfix) with ESMTP id E05948063D; Fri, 2 Feb 2024 18:44:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=13.77.154.182 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706899502; cv=none; b=gIDFwzOfrhwOZGpKXl+vYY0G9B0bSnt2npSA8FJgJl6EEz8fo/f6S8UDbV59leZWA4aa3ACSeGYmhh+rXhTNp4IaTshR3Cc7EBPAf4fdLEA3lf1ofBP52l7MVGCCDkcrZOsXtyd4jgfQVW36vstfaGvTsjVR5IkwvWfJs3+gS0E= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706899502; c=relaxed/simple; bh=GOTOl32tyEUqyiUqhLrtlUNFRb2MzjMvHRjHDbTATds=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=X1DsWpBh1UVXTfFCBfTG9c5Rz8FBxys93p+z5XUyqQ8Z9BH6+skKEJeq5pRscpqR+a8iTQ+zFBU48s3UeIoag6EjOsz+LeogjMFzEw7MUaZHRzepN7YYnpvhoYlMT2rlly1t7P0qPTNmDfOjnEM8ANJKb9ynnEIXm7RzGdWFSlw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.microsoft.com; spf=pass smtp.mailfrom=linux.microsoft.com; dkim=pass (1024-bit key) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b=CrihQ6FJ; arc=none smtp.client-ip=13.77.154.182 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.microsoft.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.microsoft.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b="CrihQ6FJ" Received: from localhost.localdomain (unknown [4.155.48.115]) by linux.microsoft.com (Postfix) with ESMTPSA id D8B8520B2003; Fri, 2 Feb 2024 10:44:58 -0800 (PST) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com D8B8520B2003 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1706899498; bh=KUDMkr8RLsAYmhZAS3vUhiwE/jC9o4CeWLT+JtE+tIA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=CrihQ6FJTtYTCwYDlu0e3y0carlrbGPga2EFZvSlqG2DlZ7fflirlfAuttNUW8ssp CULnETctYnIY+xC8P7gvi+aHoOs8kUQR6tMfIfjMYS3PcG2lQE3dRyC1qmhe2C5NpU mMsyHvoYtoFHwhkpEs22uCYo3UojXPalmk06C7yQ= From: Beau Belgrave To: rostedt@goodmis.org, mhiramat@kernel.org Cc: linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, mathieu.desnoyers@efficios.com Subject: [PATCH v2 3/4] selftests/user_events: Test multi-format events Date: Fri, 2 Feb 2024 18:44:48 +0000 Message-Id: <20240202184449.1674-4-beaub@linux.microsoft.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240202184449.1674-1-beaub@linux.microsoft.com> References: <20240202184449.1674-1-beaub@linux.microsoft.com> Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User_events now has multi-format events which allow for the same register name, but with different formats. When this occurs, different tracepoints are created with unique names. Add a new test that ensures the same name can be used for two different formats. Ensure they are isolated from each other and that name and arg matching still works if yet another register comes in with the same format as one of the two. Signed-off-by: Beau Belgrave --- .../testing/selftests/user_events/abi_test.c | 134 ++++++++++++++++++ 1 file changed, 134 insertions(+) diff --git a/tools/testing/selftests/user_events/abi_test.c b/tools/testing/selftests/user_events/abi_test.c index cef1ff1af223..7288a05136ba 100644 --- a/tools/testing/selftests/user_events/abi_test.c +++ b/tools/testing/selftests/user_events/abi_test.c @@ -16,6 +16,8 @@ #include #include #include +#include +#include #include #include "../kselftest_harness.h" @@ -23,6 +25,62 @@ const char *data_file = "/sys/kernel/tracing/user_events_data"; const char *enable_file = "/sys/kernel/tracing/events/user_events/__abi_event/enable"; +const char *multi_dir_glob = "/sys/kernel/tracing/events/user_events_multi/__abi_event.*"; + +static int wait_for_delete(char *dir) +{ + struct stat buf; + int i; + + for (i = 0; i < 10000; ++i) { + if (stat(dir, &buf) == -1 && errno == ENOENT) + return 0; + + usleep(1000); + } + + return -1; +} + +static int find_multi_event_dir(char *unique_field, char *out_dir, int dir_len) +{ + char path[256]; + glob_t buf; + int i, ret; + + ret = glob(multi_dir_glob, GLOB_ONLYDIR, NULL, &buf); + + if (ret) + return -1; + + ret = -1; + + for (i = 0; i < buf.gl_pathc; ++i) { + FILE *fp; + + snprintf(path, sizeof(path), "%s/format", buf.gl_pathv[i]); + fp = fopen(path, "r"); + + if (!fp) + continue; + + while (fgets(path, sizeof(path), fp) != NULL) { + if (strstr(path, unique_field)) { + fclose(fp); + /* strscpy is not available, use snprintf */ + snprintf(out_dir, dir_len, "%s", buf.gl_pathv[i]); + ret = 0; + goto out; + } + } + + fclose(fp); + } +out: + globfree(&buf); + + return ret; +} static bool event_exists(void) { @@ -74,6 +132,39 @@ static int event_delete(void) return ret; } +static int reg_enable_multi(void *enable, int size, int bit, int flags, + char *args) +{ + struct user_reg reg = {0}; + char full_args[512] = {0}; + int fd = open(data_file, O_RDWR); + int len; + int ret; + + if (fd < 0) + return -1; + + len = snprintf(full_args, sizeof(full_args), "__abi_event %s", args); + + if (len > sizeof(full_args)) { + ret = -E2BIG; + goto out; + } + + reg.size = sizeof(reg); + reg.name_args = (__u64)full_args; + reg.flags = USER_EVENT_REG_MULTI_FORMAT | flags; + reg.enable_bit = bit; + reg.enable_addr = (__u64)enable; + reg.enable_size = size; + + ret = ioctl(fd, DIAG_IOCSREG, ®); +out: + close(fd); + + return ret; +} + static int reg_enable_flags(void *enable, int size, int bit, int flags) { struct user_reg reg = {0}; @@ -207,6 +298,49 @@ TEST_F(user, bit_sizes) { ASSERT_NE(0, reg_enable(&self->check, 128, 0)); } +TEST_F(user, multi_format) { + char first_dir[256]; + char second_dir[256]; + struct stat buf; + + /* Multiple formats for the same name should work */ + ASSERT_EQ(0, reg_enable_multi(&self->check, sizeof(int), 0, + 0, "u32 multi_first")); + + ASSERT_EQ(0, reg_enable_multi(&self->check, sizeof(int), 1, + 0, "u64 multi_second")); + + /* Same name with same format should also work */ + ASSERT_EQ(0, reg_enable_multi(&self->check, sizeof(int), 2, + 0, "u64 multi_second")); + + ASSERT_EQ(0, find_multi_event_dir("multi_first", + first_dir, sizeof(first_dir))); + + ASSERT_EQ(0, find_multi_event_dir("multi_second", + second_dir, sizeof(second_dir))); + + /* Should not be found in the same dir */ + ASSERT_NE(0, strcmp(first_dir, second_dir)); + + /* First dir should still exist */ + ASSERT_EQ(0, stat(first_dir, &buf)); + + /* Disabling first register should remove first dir */ + ASSERT_EQ(0, reg_disable(&self->check, 0)); + ASSERT_EQ(0, wait_for_delete(first_dir)); + + /* Second dir should still exist */ + ASSERT_EQ(0, stat(second_dir, &buf)); + + /* Disabling second register should remove second dir */ + ASSERT_EQ(0, reg_disable(&self->check, 1)); + /* Ensure bit 1 and 2 are tied together, should not delete yet */ + ASSERT_EQ(0, stat(second_dir, &buf)); + ASSERT_EQ(0, reg_disable(&self->check, 2)); + ASSERT_EQ(0, wait_for_delete(second_dir)); +} + TEST_F(user, forks) { int i;