[PATCH bpf-next v4 2/2] selftests/bpf: use canonical ftrace path
From: Ross Zwisler
Date: Mon Mar 13 2023 - 16:57:47 EST
From: Ross Zwisler <zwisler@xxxxxxxxxx>
The canonical location for the tracefs filesystem is at
/sys/kernel/tracing.
But, from Documentation/trace/ftrace.rst:
Before 4.1, all ftrace tracing control files were within the debugfs
file system, which is typically located at /sys/kernel/debug/tracing.
For backward compatibility, when mounting the debugfs file system,
the tracefs file system will be automatically mounted at:
/sys/kernel/debug/tracing
Many tests in the bpf selftest code still refer to this older debugfs
path, so let's update them to avoid confusion.
Signed-off-by: Ross Zwisler <zwisler@xxxxxxxxxx>
Acked-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
---
tools/testing/selftests/bpf/get_cgroup_id_user.c | 9 +++++++--
.../selftests/bpf/prog_tests/kprobe_multi_test.c | 7 ++++++-
.../selftests/bpf/prog_tests/task_fd_query_tp.c | 9 +++++++--
.../selftests/bpf/prog_tests/tp_attach_query.c | 9 +++++++--
.../testing/selftests/bpf/prog_tests/trace_printk.c | 10 +++++++---
.../selftests/bpf/prog_tests/trace_vprintk.c | 10 +++++++---
.../selftests/bpf/progs/test_stacktrace_map.c | 2 +-
tools/testing/selftests/bpf/progs/test_tracepoint.c | 2 +-
tools/testing/selftests/bpf/test_ftrace.sh | 7 ++++++-
tools/testing/selftests/bpf/test_tunnel.sh | 13 +++++++++----
tools/testing/selftests/bpf/trace_helpers.c | 8 ++++++--
11 files changed, 64 insertions(+), 22 deletions(-)
diff --git a/tools/testing/selftests/bpf/get_cgroup_id_user.c b/tools/testing/selftests/bpf/get_cgroup_id_user.c
index 156743cf5870..aefd83ebdcd7 100644
--- a/tools/testing/selftests/bpf/get_cgroup_id_user.c
+++ b/tools/testing/selftests/bpf/get_cgroup_id_user.c
@@ -86,8 +86,13 @@ int main(int argc, char **argv)
pid = getpid();
bpf_map_update_elem(pidmap_fd, &key, &pid, 0);
- snprintf(buf, sizeof(buf),
- "/sys/kernel/debug/tracing/events/%s/id", probe_name);
+ if (access("/sys/kernel/tracing/trace", F_OK) == 0) {
+ snprintf(buf, sizeof(buf),
+ "/sys/kernel/tracing/events/%s/id", probe_name);
+ } else {
+ snprintf(buf, sizeof(buf),
+ "/sys/kernel/debug/tracing/events/%s/id", probe_name);
+ }
efd = open(buf, O_RDONLY, 0);
if (CHECK(efd < 0, "open", "err %d errno %d\n", efd, errno))
goto close_prog;
diff --git a/tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c b/tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c
index 113dba349a57..22be0a9a5a0a 100644
--- a/tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c
+++ b/tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c
@@ -338,7 +338,12 @@ static int get_syms(char ***symsp, size_t *cntp, bool kernel)
* Filtering out duplicates by using hashmap__add, which won't
* add existing entry.
*/
- f = fopen("/sys/kernel/debug/tracing/available_filter_functions", "r");
+
+ if (access("/sys/kernel/tracing/trace", F_OK) == 0)
+ f = fopen("/sys/kernel/tracing/available_filter_functions", "r");
+ else
+ f = fopen("/sys/kernel/debug/tracing/available_filter_functions", "r");
+
if (!f)
return -EINVAL;
diff --git a/tools/testing/selftests/bpf/prog_tests/task_fd_query_tp.c b/tools/testing/selftests/bpf/prog_tests/task_fd_query_tp.c
index c717741bf8b6..c91eda624657 100644
--- a/tools/testing/selftests/bpf/prog_tests/task_fd_query_tp.c
+++ b/tools/testing/selftests/bpf/prog_tests/task_fd_query_tp.c
@@ -17,8 +17,13 @@ static void test_task_fd_query_tp_core(const char *probe_name,
if (CHECK(err, "bpf_prog_test_load", "err %d errno %d\n", err, errno))
goto close_prog;
- snprintf(buf, sizeof(buf),
- "/sys/kernel/debug/tracing/events/%s/id", probe_name);
+ if (access("/sys/kernel/tracing/trace", F_OK) == 0) {
+ snprintf(buf, sizeof(buf),
+ "/sys/kernel/tracing/events/%s/id", probe_name);
+ } else {
+ snprintf(buf, sizeof(buf),
+ "/sys/kernel/debug/tracing/events/%s/id", probe_name);
+ }
efd = open(buf, O_RDONLY, 0);
if (CHECK(efd < 0, "open", "err %d errno %d\n", efd, errno))
goto close_prog;
diff --git a/tools/testing/selftests/bpf/prog_tests/tp_attach_query.c b/tools/testing/selftests/bpf/prog_tests/tp_attach_query.c
index 770fcc3bb1ba..655d69f0ff0b 100644
--- a/tools/testing/selftests/bpf/prog_tests/tp_attach_query.c
+++ b/tools/testing/selftests/bpf/prog_tests/tp_attach_query.c
@@ -16,8 +16,13 @@ void serial_test_tp_attach_query(void)
for (i = 0; i < num_progs; i++)
obj[i] = NULL;
- snprintf(buf, sizeof(buf),
- "/sys/kernel/debug/tracing/events/sched/sched_switch/id");
+ if (access("/sys/kernel/tracing/trace", F_OK) == 0) {
+ snprintf(buf, sizeof(buf),
+ "/sys/kernel/tracing/events/sched/sched_switch/id");
+ } else {
+ snprintf(buf, sizeof(buf),
+ "/sys/kernel/debug/tracing/events/sched/sched_switch/id");
+ }
efd = open(buf, O_RDONLY, 0);
if (CHECK(efd < 0, "open", "err %d errno %d\n", efd, errno))
return;
diff --git a/tools/testing/selftests/bpf/prog_tests/trace_printk.c b/tools/testing/selftests/bpf/prog_tests/trace_printk.c
index cade7f12315f..7b9124d506a5 100644
--- a/tools/testing/selftests/bpf/prog_tests/trace_printk.c
+++ b/tools/testing/selftests/bpf/prog_tests/trace_printk.c
@@ -5,7 +5,8 @@
#include "trace_printk.lskel.h"
-#define TRACEBUF "/sys/kernel/debug/tracing/trace_pipe"
+#define TRACEFS_PIPE "/sys/kernel/tracing/trace_pipe"
+#define DEBUGFS_PIPE "/sys/kernel/debug/tracing/trace_pipe"
#define SEARCHMSG "testing,testing"
void serial_test_trace_printk(void)
@@ -34,8 +35,11 @@ void serial_test_trace_printk(void)
if (!ASSERT_OK(err, "trace_printk__attach"))
goto cleanup;
- fp = fopen(TRACEBUF, "r");
- if (!ASSERT_OK_PTR(fp, "fopen(TRACEBUF)"))
+ if (access(TRACEFS_PIPE, F_OK) == 0)
+ fp = fopen(TRACEFS_PIPE, "r");
+ else
+ fp = fopen(DEBUGFS_PIPE, "r");
+ if (!ASSERT_OK_PTR(fp, "fopen(TRACE_PIPE)"))
goto cleanup;
/* We do not want to wait forever if this test fails... */
diff --git a/tools/testing/selftests/bpf/prog_tests/trace_vprintk.c b/tools/testing/selftests/bpf/prog_tests/trace_vprintk.c
index 7a4e313e8558..44ea2fd88f4c 100644
--- a/tools/testing/selftests/bpf/prog_tests/trace_vprintk.c
+++ b/tools/testing/selftests/bpf/prog_tests/trace_vprintk.c
@@ -5,7 +5,8 @@
#include "trace_vprintk.lskel.h"
-#define TRACEBUF "/sys/kernel/debug/tracing/trace_pipe"
+#define TRACEFS_PIPE "/sys/kernel/tracing/trace_pipe"
+#define DEBUGFS_PIPE "/sys/kernel/debug/tracing/trace_pipe"
#define SEARCHMSG "1,2,3,4,5,6,7,8,9,10"
void serial_test_trace_vprintk(void)
@@ -27,8 +28,11 @@ void serial_test_trace_vprintk(void)
if (!ASSERT_OK(err, "trace_vprintk__attach"))
goto cleanup;
- fp = fopen(TRACEBUF, "r");
- if (!ASSERT_OK_PTR(fp, "fopen(TRACEBUF)"))
+ if (access(TRACEFS_PIPE, F_OK) == 0)
+ fp = fopen(TRACEFS_PIPE, "r");
+ else
+ fp = fopen(DEBUGFS_PIPE, "r");
+ if (!ASSERT_OK_PTR(fp, "fopen(TRACE_PIPE)"))
goto cleanup;
/* We do not want to wait forever if this test fails... */
diff --git a/tools/testing/selftests/bpf/progs/test_stacktrace_map.c b/tools/testing/selftests/bpf/progs/test_stacktrace_map.c
index 728dbd39eff0..47568007b668 100644
--- a/tools/testing/selftests/bpf/progs/test_stacktrace_map.c
+++ b/tools/testing/selftests/bpf/progs/test_stacktrace_map.c
@@ -38,7 +38,7 @@ struct {
__type(value, stack_trace_t);
} stack_amap SEC(".maps");
-/* taken from /sys/kernel/debug/tracing/events/sched/sched_switch/format */
+/* taken from /sys/kernel/tracing/events/sched/sched_switch/format */
struct sched_switch_args {
unsigned long long pad;
char prev_comm[TASK_COMM_LEN];
diff --git a/tools/testing/selftests/bpf/progs/test_tracepoint.c b/tools/testing/selftests/bpf/progs/test_tracepoint.c
index 43bd7a20cc50..4cb8bbb6a320 100644
--- a/tools/testing/selftests/bpf/progs/test_tracepoint.c
+++ b/tools/testing/selftests/bpf/progs/test_tracepoint.c
@@ -4,7 +4,7 @@
#include <vmlinux.h>
#include <bpf/bpf_helpers.h>
-/* taken from /sys/kernel/debug/tracing/events/sched/sched_switch/format */
+/* taken from /sys/kernel/tracing/events/sched/sched_switch/format */
struct sched_switch_args {
unsigned long long pad;
char prev_comm[TASK_COMM_LEN];
diff --git a/tools/testing/selftests/bpf/test_ftrace.sh b/tools/testing/selftests/bpf/test_ftrace.sh
index 20de7bb873bc..f5109eb0e951 100755
--- a/tools/testing/selftests/bpf/test_ftrace.sh
+++ b/tools/testing/selftests/bpf/test_ftrace.sh
@@ -1,6 +1,11 @@
#!/bin/bash
-TR=/sys/kernel/debug/tracing/
+if [[ -e /sys/kernel/tracing/trace ]]; then
+ TR=/sys/kernel/tracing/
+else
+ TR=/sys/kernel/debug/tracing/
+fi
+
clear_trace() { # reset trace output
echo > $TR/trace
}
diff --git a/tools/testing/selftests/bpf/test_tunnel.sh b/tools/testing/selftests/bpf/test_tunnel.sh
index 06857b689c11..2dec7dbf29a2 100755
--- a/tools/testing/selftests/bpf/test_tunnel.sh
+++ b/tools/testing/selftests/bpf/test_tunnel.sh
@@ -571,8 +571,13 @@ setup_xfrm_tunnel()
test_xfrm_tunnel()
{
+ if [[ -e /sys/kernel/tracing/trace ]]; then
+ TRACE=/sys/kernel/tracing/trace
+ else
+ TRACE=/sys/kernel/debug/tracing/trace
+ fi
config_device
- > /sys/kernel/debug/tracing/trace
+ > ${TRACE}
setup_xfrm_tunnel
mkdir -p ${BPF_PIN_TUNNEL_DIR}
bpftool prog loadall ${BPF_FILE} ${BPF_PIN_TUNNEL_DIR}
@@ -581,11 +586,11 @@ test_xfrm_tunnel()
${BPF_PIN_TUNNEL_DIR}/xfrm_get_state
ip netns exec at_ns0 ping $PING_ARG 10.1.1.200
sleep 1
- grep "reqid 1" /sys/kernel/debug/tracing/trace
+ grep "reqid 1" ${TRACE}
check_err $?
- grep "spi 0x1" /sys/kernel/debug/tracing/trace
+ grep "spi 0x1" ${TRACE}
check_err $?
- grep "remote ip 0xac100164" /sys/kernel/debug/tracing/trace
+ grep "remote ip 0xac100164" ${TRACE}
check_err $?
cleanup
diff --git a/tools/testing/selftests/bpf/trace_helpers.c b/tools/testing/selftests/bpf/trace_helpers.c
index 09a16a77bae4..934bf28fc888 100644
--- a/tools/testing/selftests/bpf/trace_helpers.c
+++ b/tools/testing/selftests/bpf/trace_helpers.c
@@ -12,7 +12,8 @@
#include <sys/mman.h>
#include "trace_helpers.h"
-#define DEBUGFS "/sys/kernel/debug/tracing/"
+#define TRACEFS_PIPE "/sys/kernel/tracing/trace_pipe"
+#define DEBUGFS_PIPE "/sys/kernel/debug/tracing/trace_pipe"
#define MAX_SYMS 300000
static struct ksym syms[MAX_SYMS];
@@ -136,7 +137,10 @@ void read_trace_pipe(void)
{
int trace_fd;
- trace_fd = open(DEBUGFS "trace_pipe", O_RDONLY, 0);
+ if (access(TRACEFS_PIPE, F_OK) == 0)
+ trace_fd = open(TRACEFS_PIPE, O_RDONLY, 0);
+ else
+ trace_fd = open(DEBUGFS_PIPE, O_RDONLY, 0);
if (trace_fd < 0)
return;
--
2.40.0.rc1.284.g88254d51c5-goog