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Date: Wed, 04 Oct 2023 21:53:14 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: linux-kernel@...r.kernel.org
Cc: Masami Hiramatsu <mhiramat@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Andrew Morton <akpm@...ux-foundation.org>,
Beau Belgrave <beaub@...ux.microsoft.com>
Subject: [for-next][PATCH 4/7] selftests/user_events: Test persist flag cases
From: Beau Belgrave <beaub@...ux.microsoft.com>
Now that we have exposed USER_EVENT_REG_PERSIST events can persist both
via the ABI and in the /sys/kernel/tracing/dynamic_events file.
Ensure both the ABI and DYN cases work by calling both during the parse
tests. Add new flags test that ensures only USER_EVENT_REG_PERSIST is
honored and any other flag is invalid.
Link: https://lkml.kernel.org/r/20230912180704.1284-3-beaub@linux.microsoft.com
Signed-off-by: Beau Belgrave <beaub@...ux.microsoft.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
---
.../testing/selftests/user_events/abi_test.c | 55 ++++++++++++++++++-
.../testing/selftests/user_events/dyn_test.c | 54 +++++++++++++++++-
2 files changed, 107 insertions(+), 2 deletions(-)
diff --git a/tools/testing/selftests/user_events/abi_test.c b/tools/testing/selftests/user_events/abi_test.c
index 8202f1327c39..3d539e556dcd 100644
--- a/tools/testing/selftests/user_events/abi_test.c
+++ b/tools/testing/selftests/user_events/abi_test.c
@@ -24,6 +24,18 @@
const char *data_file = "/sys/kernel/tracing/user_events_data";
const char *enable_file = "/sys/kernel/tracing/events/user_events/__abi_event/enable";
+static bool event_exists(void)
+{
+ int fd = open(enable_file, O_RDWR);
+
+ if (fd < 0)
+ return false;
+
+ close(fd);
+
+ return true;
+}
+
static int change_event(bool enable)
{
int fd = open(enable_file, O_RDWR);
@@ -47,7 +59,22 @@ static int change_event(bool enable)
return ret;
}
-static int reg_enable(long *enable, int size, int bit)
+static int event_delete(void)
+{
+ int fd = open(data_file, O_RDWR);
+ int ret;
+
+ if (fd < 0)
+ return -1;
+
+ ret = ioctl(fd, DIAG_IOCSDEL, "__abi_event");
+
+ close(fd);
+
+ return ret;
+}
+
+static int reg_enable_flags(long *enable, int size, int bit, int flags)
{
struct user_reg reg = {0};
int fd = open(data_file, O_RDWR);
@@ -58,6 +85,7 @@ static int reg_enable(long *enable, int size, int bit)
reg.size = sizeof(reg);
reg.name_args = (__u64)"__abi_event";
+ reg.flags = flags;
reg.enable_bit = bit;
reg.enable_addr = (__u64)enable;
reg.enable_size = size;
@@ -69,6 +97,11 @@ static int reg_enable(long *enable, int size, int bit)
return ret;
}
+static int reg_enable(long *enable, int size, int bit)
+{
+ return reg_enable_flags(enable, size, bit, 0);
+}
+
static int reg_disable(long *enable, int bit)
{
struct user_unreg reg = {0};
@@ -126,6 +159,26 @@ TEST_F(user, enablement) {
ASSERT_EQ(0, change_event(false));
}
+TEST_F(user, flags) {
+ /* USER_EVENT_REG_PERSIST is allowed */
+ ASSERT_EQ(0, reg_enable_flags(&self->check, sizeof(int), 0,
+ USER_EVENT_REG_PERSIST));
+ ASSERT_EQ(0, reg_disable(&self->check, 0));
+
+ /* Ensure it exists after close and disable */
+ ASSERT_TRUE(event_exists());
+
+ /* Ensure we can delete it */
+ ASSERT_EQ(0, event_delete());
+
+ /* USER_EVENT_REG_MAX or above is not allowed */
+ ASSERT_EQ(-1, reg_enable_flags(&self->check, sizeof(int), 0,
+ USER_EVENT_REG_MAX));
+
+ /* Ensure it does not exist after invalid flags */
+ ASSERT_FALSE(event_exists());
+}
+
TEST_F(user, bit_sizes) {
/* Allow 0-31 bits for 32-bit */
ASSERT_EQ(0, reg_enable(&self->check, sizeof(int), 0));
diff --git a/tools/testing/selftests/user_events/dyn_test.c b/tools/testing/selftests/user_events/dyn_test.c
index a85980190bea..bdf9ab127488 100644
--- a/tools/testing/selftests/user_events/dyn_test.c
+++ b/tools/testing/selftests/user_events/dyn_test.c
@@ -17,9 +17,25 @@
#include "../kselftest_harness.h"
#include "user_events_selftests.h"
+const char *dyn_file = "/sys/kernel/tracing/dynamic_events";
const char *abi_file = "/sys/kernel/tracing/user_events_data";
const char *enable_file = "/sys/kernel/tracing/events/user_events/__test_event/enable";
+static int event_delete(void)
+{
+ int fd = open(abi_file, O_RDWR);
+ int ret;
+
+ if (fd < 0)
+ return -1;
+
+ ret = ioctl(fd, DIAG_IOCSDEL, "__test_event");
+
+ close(fd);
+
+ return ret;
+}
+
static bool wait_for_delete(void)
{
int i;
@@ -64,7 +80,31 @@ static int unreg_event(int fd, int *check, int bit)
return ioctl(fd, DIAG_IOCSUNREG, &unreg);
}
-static int parse(int *check, const char *value)
+static int parse_dyn(const char *value)
+{
+ int fd = open(dyn_file, O_RDWR | O_APPEND);
+ int len = strlen(value);
+ int ret;
+
+ if (fd == -1)
+ return -1;
+
+ ret = write(fd, value, len);
+
+ if (ret == len)
+ ret = 0;
+ else
+ ret = -1;
+
+ close(fd);
+
+ if (ret == 0)
+ event_delete();
+
+ return ret;
+}
+
+static int parse_abi(int *check, const char *value)
{
int fd = open(abi_file, O_RDWR);
int ret;
@@ -90,6 +130,18 @@ static int parse(int *check, const char *value)
return ret;
}
+static int parse(int *check, const char *value)
+{
+ int abi_ret = parse_abi(check, value);
+ int dyn_ret = parse_dyn(value);
+
+ /* Ensure both ABI and DYN parse the same way */
+ if (dyn_ret != abi_ret)
+ return -1;
+
+ return dyn_ret;
+}
+
static int check_match(int *check, const char *first, const char *second, bool *match)
{
int fd = open(abi_file, O_RDWR);
--
2.40.1
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