* [PATCH v3 1/2] tracing/boot: Add support for eprobe, fprobe, and tprobe events
2026-08-07 21:44 [PATCH v3 0/2] tracing/boot: Support eprobe, fprobe, and tprobe events and add test framework Masami Hiramatsu (Google)
@ 2026-08-07 21:44 ` Masami Hiramatsu (Google)
2026-08-07 21:44 ` [PATCH v3 2/2] selftests/ftrace: Add boot-time tracing test framework Masami Hiramatsu (Google)
1 sibling, 0 replies; 3+ messages in thread
From: Masami Hiramatsu (Google) @ 2026-08-07 21:44 UTC (permalink / raw)
To: Steven Rostedt, Masami Hiramatsu, Jonathan Corbet, Shuah Khan
Cc: Mathieu Desnoyers, linux-kernel, linux-trace-kernel, linux-doc,
linux-kselftest
From: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Boot-time tracing currently supports kprobe-events and synthetic-events
under per-event configuration options.
Extend boot-time tracing to support newly added dynamic probe types:
- event probes (eprobe) under the "eprobes" event group
- function probes (fprobe) under the "fprobes" event group
- tracepoint probes (tprobe) under the "tracepoints" or "tprobes"
event group
To support this cleanly, update dyn_event_create() in trace_dynevent.c
so that passing NULL as the type parameter delegates to
create_dyn_event(), allowing generic creation of any registered
dynamic event type from a raw command string.
Update Documentation/trace/boottime-trace.rst accordingly to describe
the new per-event bootconfig options.
Assisted-by: Antigravity:gemini-3.6-flash
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Changes in v3:
- Check return values of strscpy() and snprintf() in trace_boot_add_probe_event()
to prevent silent buffer truncation when constructing probe event strings.
Changes in v2:
- Fix raw command detection logic for eprobes, fprobes, and tprobes
by requiring ':' or isspace() after type prefix.
- Consolidate duplicate loop logic into trace_boot_add_probe_event()
helper function.
---
Documentation/trace/boottime-trace.rst | 18 +++++-
kernel/trace/trace_boot.c | 97 ++++++++++++++++++++++++++++++++
kernel/trace/trace_dynevent.c | 5 ++
3 files changed, 117 insertions(+), 3 deletions(-)
diff --git a/Documentation/trace/boottime-trace.rst b/Documentation/trace/boottime-trace.rst
index 651f3a2c01de..2c3c1fedb92c 100644
--- a/Documentation/trace/boottime-trace.rst
+++ b/Documentation/trace/boottime-trace.rst
@@ -121,9 +121,21 @@ ftrace.[instance.INSTANCE.]event.synthetic.EVENT.fields = FIELD[, FIELD2[...]]
Defines new synthetic event with FIELDs. Each field should be
"type varname".
-Note that kprobe and synthetic event definitions can be written under
-instance node, but those are also visible from other instances. So please
-take care for event name conflict.
+ftrace.[instance.INSTANCE.]event.eprobes.EVENT.probes = PROBE[, PROBE2[...]]
+ Defines new event probe based on PROBEs. This option is available only
+ for the event which group name is "eprobes".
+
+ftrace.[instance.INSTANCE.]event.fprobes.EVENT.probes = PROBE[, PROBE2[...]]
+ Defines new fprobe event based on PROBEs. This option is available only
+ for the event which group name is "fprobes".
+
+ftrace.[instance.INSTANCE.]event.tracepoints.EVENT.probes = PROBE[, PROBE2[...]]
+ Defines new tracepoint probe based on PROBEs. This option is available only
+ for the event which group name is "tracepoints" or "tprobes".
+
+Note that dynamic event definitions can be written under instance node, but
+those are also visible from other instances. So please take care for event
+name conflict.
Ftrace Histogram Options
------------------------
diff --git a/kernel/trace/trace_boot.c b/kernel/trace/trace_boot.c
index 2ca2541c8a58..5da0a8bbb110 100644
--- a/kernel/trace/trace_boot.c
+++ b/kernel/trace/trace_boot.c
@@ -18,6 +18,7 @@
#include <linux/trace_events.h>
#include "trace.h"
+#include "trace_dynevent.h"
#define MAX_BUF_LEN 256
@@ -172,6 +173,93 @@ trace_boot_add_synth_event(struct xbc_node *node, const char *event)
}
#endif
+#if defined(CONFIG_EPROBE_EVENTS) || defined(CONFIG_FPROBE_EVENTS)
+static int __init
+trace_boot_add_probe_event(struct xbc_node *node, const char *group,
+ const char *event, char type, const char *type_name)
+{
+ struct xbc_node *anode;
+ char buf[MAX_BUF_LEN];
+ const char *val;
+ int ret = 0;
+
+ xbc_node_for_each_array_value(node, "probes", anode, val) {
+ if (val[0] == type && (val[1] == ':' || isspace(val[1]))) {
+ ret = strscpy(buf, val, MAX_BUF_LEN);
+ if (ret < 0) {
+ pr_err("%s command is too long: %s\n", type_name, val);
+ break;
+ }
+ } else {
+ ret = snprintf(buf, MAX_BUF_LEN, "%c:%s/%s %s", type, group, event, val);
+ if (ret >= MAX_BUF_LEN || ret < 0) {
+ pr_err("%s command is too long: %c:%s/%s %s\n",
+ type_name, type, group, event, val);
+ ret = -E2BIG;
+ break;
+ }
+ }
+
+ ret = dyn_event_create(buf, NULL);
+ if (ret) {
+ pr_err("Failed to add %s: %s\n", type_name, buf);
+ break;
+ }
+ }
+
+ return ret;
+}
+#endif
+
+#ifdef CONFIG_EPROBE_EVENTS
+static inline int __init
+trace_boot_add_eprobe_event(struct xbc_node *node, const char *group,
+ const char *event)
+{
+ return trace_boot_add_probe_event(node, group, event, 'e', "eprobe");
+}
+#else
+static inline int __init
+trace_boot_add_eprobe_event(struct xbc_node *node, const char *group,
+ const char *event)
+{
+ pr_err("Event probe is not supported.\n");
+ return -EOPNOTSUPP;
+}
+#endif
+
+#ifdef CONFIG_FPROBE_EVENTS
+static inline int __init
+trace_boot_add_fprobe_event(struct xbc_node *node, const char *group,
+ const char *event)
+{
+ return trace_boot_add_probe_event(node, group, event, 'f', "fprobe");
+}
+
+static inline int __init
+trace_boot_add_tprobe_event(struct xbc_node *node, const char *group,
+ const char *event)
+{
+ return trace_boot_add_probe_event(node, group, event, 't', "tprobe");
+}
+#else
+static inline int __init
+trace_boot_add_fprobe_event(struct xbc_node *node, const char *group,
+ const char *event)
+{
+ pr_err("Fprobe event is not supported.\n");
+ return -EOPNOTSUPP;
+}
+
+static inline int __init
+trace_boot_add_tprobe_event(struct xbc_node *node, const char *group,
+ const char *event)
+{
+ pr_err("Tracepoint probe is not supported.\n");
+ return -EOPNOTSUPP;
+}
+#endif
+
#ifdef CONFIG_HIST_TRIGGERS
static int __init __printf(3, 4)
append_printf(char **bufp, char *end, const char *fmt, ...)
@@ -477,6 +565,15 @@ trace_boot_init_one_event(struct trace_array *tr, struct xbc_node *gnode,
if (!strcmp(group, "synthetic"))
if (trace_boot_add_synth_event(enode, event) < 0)
return;
+ if (!strcmp(group, "eprobes"))
+ if (trace_boot_add_eprobe_event(enode, group, event) < 0)
+ return;
+ if (!strcmp(group, "fprobes"))
+ if (trace_boot_add_fprobe_event(enode, group, event) < 0)
+ return;
+ if (!strcmp(group, "tracepoints") || !strcmp(group, "tprobes"))
+ if (trace_boot_add_tprobe_event(enode, group, event) < 0)
+ return;
mutex_lock(&event_mutex);
file = find_event_file(tr, group, event);
diff --git a/kernel/trace/trace_dynevent.c b/kernel/trace/trace_dynevent.c
index c4dfbc293bae..6f2e39b797e5 100644
--- a/kernel/trace/trace_dynevent.c
+++ b/kernel/trace/trace_dynevent.c
@@ -116,6 +116,8 @@ int dyn_event_release(const char *raw_command, struct dyn_event_operations *type
return ret;
}
+static int create_dyn_event(const char *raw_command);
+
/*
* Locked version of event creation. The event creation must be protected by
* dyn_event_ops_mutex because of protecting trace_probe_log.
@@ -124,6 +126,9 @@ int dyn_event_create(const char *raw_command, struct dyn_event_operations *type)
{
int ret;
+ if (!type)
+ return create_dyn_event(raw_command);
+
mutex_lock(&dyn_event_ops_mutex);
ret = type->create(raw_command);
mutex_unlock(&dyn_event_ops_mutex);
^ permalink raw reply related [flat|nested] 3+ messages in thread* [PATCH v3 2/2] selftests/ftrace: Add boot-time tracing test framework
2026-08-07 21:44 [PATCH v3 0/2] tracing/boot: Support eprobe, fprobe, and tprobe events and add test framework Masami Hiramatsu (Google)
2026-08-07 21:44 ` [PATCH v3 1/2] tracing/boot: Add support for eprobe, fprobe, and tprobe events Masami Hiramatsu (Google)
@ 2026-08-07 21:44 ` Masami Hiramatsu (Google)
1 sibling, 0 replies; 3+ messages in thread
From: Masami Hiramatsu (Google) @ 2026-08-07 21:44 UTC (permalink / raw)
To: Steven Rostedt, Masami Hiramatsu, Jonathan Corbet, Shuah Khan
Cc: Mathieu Desnoyers, linux-kernel, linux-trace-kernel, linux-doc,
linux-kselftest
From: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Add an automated test framework under
tools/testing/selftests/ftrace/boottime/ to verify boot-time tracing
configuration parsing.
The test runner (run_boottime_test.sh) sources ktap_helpers.sh to
generate output in TAP version 13 format. It builds a minimal
initramfs with busybox, attaches bootconfig examples using
tools/bootconfig/bootconfig, boots QEMU, and runs corresponding
tracefs checker scripts.
Assisted-by: Antigravity:gemini-3.6-flash
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Changes in v3:
- Remove boottime/run_boottime_test.sh from TEST_PROGS_EXTENDED in Makefile
to prevent lib.mk from flattening it into top-level ftrace/ on make install.
- Support executing run_boottime_test.sh both in-tree and in installed
kselftest environment.
- Add HUP, INT, and TERM signal handlers to tempdir cleanup trap.
- Validate workdir creation and update run_single_test() to return 0 on test
failures so set -e is not suspended by invocation in an AND-OR list.
Changes in v2:
- Copy shared library dependencies using ldd if busybox is dynamically
linked.
- Wrap QEMU execution with timeout command and add -T/--timeout CLI
option.
- Add pre-flight checks for busybox architecture compatibility and
cpio tool in run_boottime_test.sh.
- Fix POSIX syntax compatibility and allow bypassing HOST_ARCH skip
when custom kernel/QEMU parameters are passed.
- Add boottime/run_boottime_test.sh to TEST_PROGS_EXTENDED in
selftests/ftrace/Makefile.
---
tools/testing/selftests/ftrace/Makefile | 2
tools/testing/selftests/ftrace/boottime/Makefile | 10 +
tools/testing/selftests/ftrace/boottime/README | 58 ++++
.../ftrace/boottime/bootconfigs/01-kprobe.bconf | 5
.../ftrace/boottime/bootconfigs/02-synth.bconf | 4
.../ftrace/boottime/bootconfigs/03-eprobe.bconf | 4
.../ftrace/boottime/bootconfigs/04-fprobe.bconf | 4
.../ftrace/boottime/bootconfigs/05-tprobe.bconf | 4
.../ftrace/boottime/bootconfigs/06-instance.bconf | 5
.../selftests/ftrace/boottime/run_boottime_test.sh | 271 ++++++++++++++++++++
.../selftests/ftrace/boottime/tests/01-kprobe.sh | 18 +
.../selftests/ftrace/boottime/tests/02-synth.sh | 18 +
.../selftests/ftrace/boottime/tests/03-eprobe.sh | 18 +
.../selftests/ftrace/boottime/tests/04-fprobe.sh | 18 +
.../selftests/ftrace/boottime/tests/05-tprobe.sh | 18 +
.../selftests/ftrace/boottime/tests/06-instance.sh | 23 ++
tools/testing/selftests/ftrace/config | 4
17 files changed, 483 insertions(+), 1 deletion(-)
create mode 100644 tools/testing/selftests/ftrace/boottime/Makefile
create mode 100644 tools/testing/selftests/ftrace/boottime/README
create mode 100644 tools/testing/selftests/ftrace/boottime/bootconfigs/01-kprobe.bconf
create mode 100644 tools/testing/selftests/ftrace/boottime/bootconfigs/02-synth.bconf
create mode 100644 tools/testing/selftests/ftrace/boottime/bootconfigs/03-eprobe.bconf
create mode 100644 tools/testing/selftests/ftrace/boottime/bootconfigs/04-fprobe.bconf
create mode 100644 tools/testing/selftests/ftrace/boottime/bootconfigs/05-tprobe.bconf
create mode 100644 tools/testing/selftests/ftrace/boottime/bootconfigs/06-instance.bconf
create mode 100755 tools/testing/selftests/ftrace/boottime/run_boottime_test.sh
create mode 100755 tools/testing/selftests/ftrace/boottime/tests/01-kprobe.sh
create mode 100755 tools/testing/selftests/ftrace/boottime/tests/02-synth.sh
create mode 100755 tools/testing/selftests/ftrace/boottime/tests/03-eprobe.sh
create mode 100755 tools/testing/selftests/ftrace/boottime/tests/04-fprobe.sh
create mode 100755 tools/testing/selftests/ftrace/boottime/tests/05-tprobe.sh
create mode 100755 tools/testing/selftests/ftrace/boottime/tests/06-instance.sh
diff --git a/tools/testing/selftests/ftrace/Makefile b/tools/testing/selftests/ftrace/Makefile
index 7c12263f8260..8d8881744149 100644
--- a/tools/testing/selftests/ftrace/Makefile
+++ b/tools/testing/selftests/ftrace/Makefile
@@ -3,7 +3,7 @@ all:
TEST_PROGS_EXTENDED := ftracetest
TEST_PROGS := ftracetest-ktap
-TEST_FILES := test.d settings
+TEST_FILES := test.d settings boottime
EXTRA_CLEAN := $(OUTPUT)/logs/*
TEST_GEN_FILES := poll
diff --git a/tools/testing/selftests/ftrace/boottime/Makefile b/tools/testing/selftests/ftrace/boottime/Makefile
new file mode 100644
index 000000000000..fd0975350f10
--- /dev/null
+++ b/tools/testing/selftests/ftrace/boottime/Makefile
@@ -0,0 +1,10 @@
+# SPDX-License-Identifier: GPL-2.0
+
+all:
+
+run_tests:
+ @./run_boottime_test.sh
+
+clean:
+
+.PHONY: all run_tests clean
diff --git a/tools/testing/selftests/ftrace/boottime/README b/tools/testing/selftests/ftrace/boottime/README
new file mode 100644
index 000000000000..a6f930a6e44c
--- /dev/null
+++ b/tools/testing/selftests/ftrace/boottime/README
@@ -0,0 +1,58 @@
+Boot-Time Tracing Test Suite
+============================
+
+This directory contains an automated test framework to verify kernel boot-time
+tracing configuration parsing and tracefs application during early boot.
+
+Overview
+--------
+The test runner (`run_boottime_test.sh`) constructs a lightweight initramfs with
+busybox and a tracefs checker script from `tests/`, attaches a bootconfig example
+from `bootconfigs/` using the `bootconfig` tool, boots the target kernel image under
+QEMU, and reports results according to the TAP version 13 format.
+
+Required Tools
+--------------
+- Host Architecture: x86 (x86_64/i686/i386/x86; tests skip on non-x86 hosts)
+- `qemu-system-x86_64` (or custom QEMU executable)
+- `busybox` (host binary at `/usr/bin/busybox` or custom path)
+- `bootconfig` (compiled from `tools/bootconfig/bootconfig` or in PATH)
+- `cpio` (standard archiver)
+
+Required Kernel Configurations
+------------------------------
+The kernel binary under test must be compiled with:
+- `CONFIG_BOOT_CONFIG=y`
+- `CONFIG_BOOTTIME_TRACING=y`
+
+Additional feature-specific config options enable respective testcases:
+- `CONFIG_KPROBE_EVENTS=y` (for `01-kprobe`)
+- `CONFIG_SYNTH_EVENTS=y` (for `02-synth`)
+- `CONFIG_EPROBE_EVENTS=y` (for `03-eprobe`)
+- `CONFIG_FPROBE_EVENTS=y` (for `04-fprobe` and `05-tprobe`)
+- `CONFIG_FUNCTION_TRACER=y` (for tracer options in `06-instance`)
+
+Usage
+-----
+To run all test cases with a compiled kernel image:
+
+ $ ./run_boottime_test.sh -k /path/to/bzImage
+
+To run a specific test case (e.g. `01-kprobe`):
+
+ $ ./run_boottime_test.sh -k /path/to/bzImage -t 01-kprobe
+
+Customizing Tool Paths:
+
+ $ ./run_boottime_test.sh -b /path/to/bootconfig \
+ -k /path/to/bzImage \
+ -q /path/to/qemu-system-x86_64 \
+ -B /path/to/busybox
+
+Environment Variables
+---------------------
+Tool locations and kernel paths can also be set via environment variables:
+- `BOOTCONFIG`: Path to the `bootconfig` tool
+- `KERNEL`: Path to the `bzImage` kernel binary
+- `QEMU`: Path to the QEMU binary
+- `BUSYBOX`: Path to the `busybox` binary
diff --git a/tools/testing/selftests/ftrace/boottime/bootconfigs/01-kprobe.bconf b/tools/testing/selftests/ftrace/boottime/bootconfigs/01-kprobe.bconf
new file mode 100644
index 000000000000..f607840e3858
--- /dev/null
+++ b/tools/testing/selftests/ftrace/boottime/bootconfigs/01-kprobe.bconf
@@ -0,0 +1,5 @@
+ftrace.event.kprobes.vfs_read {
+ probes = "vfs_read $arg1 $arg2"
+ filter = "common_pid < 200"
+ enable
+}
diff --git a/tools/testing/selftests/ftrace/boottime/bootconfigs/02-synth.bconf b/tools/testing/selftests/ftrace/boottime/bootconfigs/02-synth.bconf
new file mode 100644
index 000000000000..b1f37713f33c
--- /dev/null
+++ b/tools/testing/selftests/ftrace/boottime/bootconfigs/02-synth.bconf
@@ -0,0 +1,4 @@
+ftrace.event.synthetic.boot_lat {
+ fields = "unsigned long id", "u64 delta"
+ enable
+}
diff --git a/tools/testing/selftests/ftrace/boottime/bootconfigs/03-eprobe.bconf b/tools/testing/selftests/ftrace/boottime/bootconfigs/03-eprobe.bconf
new file mode 100644
index 000000000000..f954aa7fb8bd
--- /dev/null
+++ b/tools/testing/selftests/ftrace/boottime/bootconfigs/03-eprobe.bconf
@@ -0,0 +1,4 @@
+ftrace.event.eprobes.ep_read {
+ probes = "syscalls/sys_enter_openat"
+ enable
+}
diff --git a/tools/testing/selftests/ftrace/boottime/bootconfigs/04-fprobe.bconf b/tools/testing/selftests/ftrace/boottime/bootconfigs/04-fprobe.bconf
new file mode 100644
index 000000000000..82ae2ac0629f
--- /dev/null
+++ b/tools/testing/selftests/ftrace/boottime/bootconfigs/04-fprobe.bconf
@@ -0,0 +1,4 @@
+ftrace.event.fprobes.fp_read {
+ probes = "vfs_read"
+ enable
+}
diff --git a/tools/testing/selftests/ftrace/boottime/bootconfigs/05-tprobe.bconf b/tools/testing/selftests/ftrace/boottime/bootconfigs/05-tprobe.bconf
new file mode 100644
index 000000000000..02a2803c770a
--- /dev/null
+++ b/tools/testing/selftests/ftrace/boottime/bootconfigs/05-tprobe.bconf
@@ -0,0 +1,4 @@
+ftrace.event.tracepoints.tp_sched {
+ probes = "sched_switch"
+ enable
+}
diff --git a/tools/testing/selftests/ftrace/boottime/bootconfigs/06-instance.bconf b/tools/testing/selftests/ftrace/boottime/bootconfigs/06-instance.bconf
new file mode 100644
index 000000000000..31f81da570ea
--- /dev/null
+++ b/tools/testing/selftests/ftrace/boottime/bootconfigs/06-instance.bconf
@@ -0,0 +1,5 @@
+ftrace.instance.foo {
+ event.sched.sched_switch.enable
+ buffer_size = 1MB
+ tracing_on = 1
+}
diff --git a/tools/testing/selftests/ftrace/boottime/run_boottime_test.sh b/tools/testing/selftests/ftrace/boottime/run_boottime_test.sh
new file mode 100755
index 000000000000..7ba1afc91c35
--- /dev/null
+++ b/tools/testing/selftests/ftrace/boottime/run_boottime_test.sh
@@ -0,0 +1,271 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+#
+# Boot-time tracing test runner
+# Builds a lightweight initramfs, attaches a bootconfig, boots QEMU,
+# and verifies tracefs configuration using test scripts.
+
+set -e
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+if [ -d "$SCRIPT_DIR/boottime" ]; then
+ SCRIPT_DIR="$SCRIPT_DIR/boottime"
+fi
+KERNEL_SRC="$(cd "$SCRIPT_DIR/../../../../.." && pwd)"
+
+# Source KTAP helpers
+if [ -f "$SCRIPT_DIR/../../kselftest/ktap_helpers.sh" ]; then
+ KSELFTEST_DIR="$(cd "$SCRIPT_DIR/../../kselftest" && pwd)"
+elif [ -f "$SCRIPT_DIR/../kselftest/ktap_helpers.sh" ]; then
+ KSELFTEST_DIR="$(cd "$SCRIPT_DIR/../kselftest" && pwd)"
+else
+ echo "Error: ktap_helpers.sh not found relative to $SCRIPT_DIR"
+ exit 1
+fi
+. "$KSELFTEST_DIR/ktap_helpers.sh"
+
+BOOTCONFIG="${BOOTCONFIG:-"$KERNEL_SRC/tools/bootconfig/bootconfig"}"
+KERNEL="${KERNEL:-"$KERNEL_SRC/arch/x86/boot/bzImage"}"
+QEMU="${QEMU:-"qemu-system-x86_64"}"
+BUSYBOX="${BUSYBOX:-"$(which busybox 2>/dev/null || echo "/usr/bin/busybox")"}"
+TIMEOUT="${TIMEOUT:-30s}"
+TARGET_TEST="all"
+
+usage() {
+ echo "Usage: $0 [options]"
+ echo "Options:"
+ echo " -b, --bootconfig PATH Path to bootconfig tool (default: $BOOTCONFIG)"
+ echo " -k, --kernel PATH Path to kernel image (default: $KERNEL)"
+ echo " -q, --qemu PATH Path to QEMU executable (default: $QEMU)"
+ echo " -B, --busybox PATH Path to busybox binary (default: $BUSYBOX)"
+ echo " -T, --timeout DURATION QEMU execution timeout (default: $TIMEOUT)"
+ echo " -t, --test NAME Run specific test (e.g. 01-kprobe) or 'all'"
+ echo " -h, --help Show this help message"
+ exit 1
+}
+
+while [ $# -gt 0 ]; do
+ case "$1" in
+ -b|--bootconfig)
+ BOOTCONFIG="$2"
+ shift 2
+ ;;
+ -k|--kernel)
+ KERNEL="$2"
+ shift 2
+ ;;
+ -q|--qemu)
+ QEMU="$2"
+ shift 2
+ ;;
+ -B|--busybox)
+ BUSYBOX="$2"
+ shift 2
+ ;;
+ -T|--timeout)
+ TIMEOUT="$2"
+ shift 2
+ ;;
+ -t|--test)
+ TARGET_TEST="$2"
+ shift 2
+ ;;
+ -h|--help)
+ usage
+ ;;
+ *)
+ echo "Unknown option: $1"
+ usage
+ ;;
+ esac
+done
+
+# Check host architecture
+HOST_ARCH="$(uname -m)"
+case "$HOST_ARCH" in
+ x86_64|i686|i386|x86)
+ ;;
+ *)
+ if [ "$KERNEL" = "$KERNEL_SRC/arch/x86/boot/bzImage" ]; then
+ ktap_print_header
+ ktap_skip_all \
+ "Default boot-time tracing test is x86 only ($HOST_ARCH)"
+ exit 0
+ fi
+ ;;
+esac
+
+# Ensure bootconfig tool is built if Makefile exists
+if [ ! -x "$BOOTCONFIG" ]; then
+ if [ -f "$KERNEL_SRC/tools/bootconfig/Makefile" ]; then
+ make -C "$KERNEL_SRC/tools/bootconfig" > /dev/null 2>&1 || true
+ fi
+ if [ ! -x "$BOOTCONFIG" ]; then
+ BOOTCONFIG="$(which bootconfig 2>/dev/null || true)"
+ fi
+fi
+
+if [ ! -x "$BOOTCONFIG" ]; then
+ ktap_print_header
+ ktap_skip_all "bootconfig tool not found at $BOOTCONFIG"
+ exit 0
+fi
+
+if [ ! -f "$KERNEL" ]; then
+ ktap_print_header
+ ktap_skip_all "Kernel image not found at $KERNEL"
+ exit 0
+fi
+
+if ! command -v "$QEMU" >/dev/null 2>&1; then
+ ktap_print_header
+ ktap_skip_all "QEMU binary not found: $QEMU"
+ exit 0
+fi
+
+if [ ! -x "$BUSYBOX" ]; then
+ ktap_print_header
+ ktap_skip_all "busybox binary not found at $BUSYBOX"
+ exit 0
+fi
+
+# Verify busybox architecture compatibility
+if command -v file >/dev/null 2>&1; then
+ BUSYBOX_INFO="$(file -b "$BUSYBOX" 2>/dev/null || true)"
+ case "$KERNEL" in
+ *x86*)
+ case "$BUSYBOX_INFO" in
+ *x86-64*|*x86_64*|*80386*|*i386*)
+ ;;
+ *)
+ ktap_print_header
+ ktap_skip_all "busybox binary architecture is incompatible with x86 kernel ($BUSYBOX_INFO)"
+ exit 0
+ ;;
+ esac
+ ;;
+ esac
+fi
+
+if ! command -v cpio >/dev/null 2>&1; then
+ ktap_print_header
+ ktap_skip_all "cpio tool not found"
+ exit 0
+fi
+
+run_single_test() {
+ local bconf_file="$1"
+ local test_script="$2"
+ local name="$(basename "$bconf_file" .bconf)"
+
+ local workdir="$(mktemp -d)"
+ if [ -z "$workdir" ] || [ ! -d "$workdir" ]; then
+ ktap_test_fail "$name (failed to create temporary directory)"
+ return 0
+ fi
+ trap 'rm -rf "$workdir"' EXIT HUP INT TERM
+
+ local rootfs="$workdir/rootfs"
+ mkdir -p "$rootfs"/{bin,sbin,etc,proc,sys,dev,tmp}
+
+ cp "$BUSYBOX" "$rootfs/bin/busybox"
+ chmod +x "$rootfs/bin/busybox"
+ (cd "$rootfs/bin" && for applet in sh cat mount umount echo sync reboot \
+ poweroff cpio grep; do ln -s busybox $applet; done)
+
+ if command -v ldd >/dev/null 2>&1; then
+ for lib in $(ldd "$BUSYBOX" 2>/dev/null | grep -o '/[^ ]*'); do
+ if [ -f "$lib" ]; then
+ mkdir -p "$rootfs$(dirname "$lib")"
+ cp -L "$lib" "$rootfs$lib" 2>/dev/null || true
+ fi
+ done
+ fi
+
+ cat << 'EOF' > "$rootfs/init"
+#!/bin/sh
+mount -t proc proc /proc 2>/dev/null
+mount -t sysfs sys /sys 2>/dev/null
+mount -t tracefs nodev /sys/kernel/tracing 2>/dev/null
+
+/bin/check_test.sh
+RET=$?
+
+if [ $RET -eq 0 ]; then
+ echo "TEST RESULT: PASS"
+else
+ echo "TEST RESULT: FAIL"
+fi
+
+sync
+echo o > /proc/sysrq-trigger 2>/dev/null || reboot -f 2>/dev/null || poweroff -f 2>/dev/null
+EOF
+ chmod +x "$rootfs/init"
+
+ cp "$test_script" "$rootfs/bin/check_test.sh"
+ chmod +x "$rootfs/bin/check_test.sh"
+
+ local initramfs="$workdir/initramfs.cpio"
+ (cd "$rootfs" && find . | cpio -o -H newc --quiet) > "$initramfs"
+
+ # Attach bootconfig
+ "$BOOTCONFIG" -a "$bconf_file" "$initramfs" > /dev/null
+
+ # Run QEMU with timeout
+ local timeout_cmd=""
+ if command -v timeout >/dev/null 2>&1; then
+ timeout_cmd="timeout $TIMEOUT"
+ fi
+
+ local logfile="$workdir/qemu.log"
+ $timeout_cmd "$QEMU" -kernel "$KERNEL" \
+ -initrd "$initramfs" \
+ -append "bootconfig console=ttyS0 quiet panic=-1" \
+ -nographic \
+ -no-reboot > "$logfile" 2>&1 || true
+
+ if grep -q "TEST RESULT: PASS" "$logfile"; then
+ ktap_test_pass "$name"
+ else
+ ktap_test_fail "$name"
+ ktap_print_msg "QEMU Console Output for $name:"
+ while IFS= read -r line; do
+ ktap_print_msg "$line"
+ done < "$logfile"
+ fi
+
+ rm -rf "$workdir"
+ trap - EXIT HUP INT TERM
+ return 0
+}
+
+TEST_FILES=("$SCRIPT_DIR/bootconfigs"/*.bconf)
+TOTAL_TESTS=0
+for bconf in "${TEST_FILES[@]}"; do
+ name="$(basename "$bconf" .bconf)"
+ if [ "$TARGET_TEST" != "all" ] && [ "$TARGET_TEST" != "$name" ]; then
+ continue
+ fi
+ TOTAL_TESTS=$((TOTAL_TESTS + 1))
+done
+
+ktap_print_header
+ktap_set_plan "$TOTAL_TESTS"
+
+for bconf in "${TEST_FILES[@]}"; do
+ name="$(basename "$bconf" .bconf)"
+ test_script="$SCRIPT_DIR/tests/$name.sh"
+
+ if [ "$TARGET_TEST" != "all" ] && [ "$TARGET_TEST" != "$name" ]; then
+ continue
+ fi
+
+ if [ ! -f "$test_script" ]; then
+ ktap_test_skip "$name (test script missing)"
+ continue
+ fi
+
+ run_single_test "$bconf" "$test_script"
+done
+
+ktap_finished
diff --git a/tools/testing/selftests/ftrace/boottime/tests/01-kprobe.sh b/tools/testing/selftests/ftrace/boottime/tests/01-kprobe.sh
new file mode 100755
index 000000000000..a20e7e82d158
--- /dev/null
+++ b/tools/testing/selftests/ftrace/boottime/tests/01-kprobe.sh
@@ -0,0 +1,18 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+# Check kprobe bootconfig settings on tracefs
+TRACEDIR="/sys/kernel/tracing"
+
+if [ ! -d "$TRACEDIR/events/kprobes/vfs_read" ]; then
+ echo "FAIL: kprobe event kprobes/vfs_read does not exist"
+ exit 1
+fi
+
+ENABLE=$(cat "$TRACEDIR/events/kprobes/vfs_read/enable")
+if [ "$ENABLE" != "1" ]; then
+ echo "FAIL: kprobe event kprobes/vfs_read is not enabled ($ENABLE)"
+ exit 1
+fi
+
+echo "PASS: 01-kprobe"
+exit 0
diff --git a/tools/testing/selftests/ftrace/boottime/tests/02-synth.sh b/tools/testing/selftests/ftrace/boottime/tests/02-synth.sh
new file mode 100755
index 000000000000..46d3b152cbea
--- /dev/null
+++ b/tools/testing/selftests/ftrace/boottime/tests/02-synth.sh
@@ -0,0 +1,18 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+# Check synthetic event bootconfig settings on tracefs
+TRACEDIR="/sys/kernel/tracing"
+
+if [ ! -d "$TRACEDIR/events/synthetic/boot_lat" ]; then
+ echo "FAIL: synthetic event synthetic/boot_lat does not exist"
+ exit 1
+fi
+
+ENABLE=$(cat "$TRACEDIR/events/synthetic/boot_lat/enable")
+if [ "$ENABLE" != "1" ]; then
+ echo "FAIL: synthetic event synthetic/boot_lat is not enabled ($ENABLE)"
+ exit 1
+fi
+
+echo "PASS: 02-synth"
+exit 0
diff --git a/tools/testing/selftests/ftrace/boottime/tests/03-eprobe.sh b/tools/testing/selftests/ftrace/boottime/tests/03-eprobe.sh
new file mode 100755
index 000000000000..108f9ba31c06
--- /dev/null
+++ b/tools/testing/selftests/ftrace/boottime/tests/03-eprobe.sh
@@ -0,0 +1,18 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+# Check eprobe event bootconfig settings on tracefs
+TRACEDIR="/sys/kernel/tracing"
+
+if [ ! -d "$TRACEDIR/events/eprobes/ep_read" ]; then
+ echo "FAIL: eprobe event eprobes/ep_read does not exist"
+ exit 1
+fi
+
+ENABLE=$(cat "$TRACEDIR/events/eprobes/ep_read/enable")
+if [ "$ENABLE" != "1" ]; then
+ echo "FAIL: eprobe event eprobes/ep_read is not enabled ($ENABLE)"
+ exit 1
+fi
+
+echo "PASS: 03-eprobe"
+exit 0
diff --git a/tools/testing/selftests/ftrace/boottime/tests/04-fprobe.sh b/tools/testing/selftests/ftrace/boottime/tests/04-fprobe.sh
new file mode 100755
index 000000000000..c0a316bf7dde
--- /dev/null
+++ b/tools/testing/selftests/ftrace/boottime/tests/04-fprobe.sh
@@ -0,0 +1,18 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+# Check fprobe event bootconfig settings on tracefs
+TRACEDIR="/sys/kernel/tracing"
+
+if [ ! -d "$TRACEDIR/events/fprobes/fp_read" ]; then
+ echo "FAIL: fprobe event fprobes/fp_read does not exist"
+ exit 1
+fi
+
+ENABLE=$(cat "$TRACEDIR/events/fprobes/fp_read/enable")
+if [ "$ENABLE" != "1" ]; then
+ echo "FAIL: fprobe event fprobes/fp_read is not enabled ($ENABLE)"
+ exit 1
+fi
+
+echo "PASS: 04-fprobe"
+exit 0
diff --git a/tools/testing/selftests/ftrace/boottime/tests/05-tprobe.sh b/tools/testing/selftests/ftrace/boottime/tests/05-tprobe.sh
new file mode 100755
index 000000000000..b29119b81e07
--- /dev/null
+++ b/tools/testing/selftests/ftrace/boottime/tests/05-tprobe.sh
@@ -0,0 +1,18 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+# Check tracepoint probe event bootconfig settings on tracefs
+TRACEDIR="/sys/kernel/tracing"
+
+if [ ! -d "$TRACEDIR/events/tracepoints/tp_sched" ]; then
+ echo "FAIL: tracepoint probe event tracepoints/tp_sched does not exist"
+ exit 1
+fi
+
+ENABLE=$(cat "$TRACEDIR/events/tracepoints/tp_sched/enable")
+if [ "$ENABLE" != "1" ]; then
+ echo "FAIL: tracepoint probe event tracepoints/tp_sched is not enabled ($ENABLE)"
+ exit 1
+fi
+
+echo "PASS: 05-tprobe"
+exit 0
diff --git a/tools/testing/selftests/ftrace/boottime/tests/06-instance.sh b/tools/testing/selftests/ftrace/boottime/tests/06-instance.sh
new file mode 100755
index 000000000000..a95fdddaa6a6
--- /dev/null
+++ b/tools/testing/selftests/ftrace/boottime/tests/06-instance.sh
@@ -0,0 +1,23 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+# Check instance bootconfig settings on tracefs
+TRACEDIR="/sys/kernel/tracing"
+
+if [ ! -d "$TRACEDIR/instances/foo" ]; then
+ echo "FAIL: trace instance foo does not exist"
+ exit 1
+fi
+
+if [ ! -d "$TRACEDIR/instances/foo/events/sched/sched_switch" ]; then
+ echo "FAIL: event sched_switch does not exist in instance foo"
+ exit 1
+fi
+
+ENABLE=$(cat "$TRACEDIR/instances/foo/events/sched/sched_switch/enable")
+if [ "$ENABLE" != "1" ]; then
+ echo "FAIL: event sched_switch is not enabled in instance foo ($ENABLE)"
+ exit 1
+fi
+
+echo "PASS: 06-instance"
+exit 0
diff --git a/tools/testing/selftests/ftrace/config b/tools/testing/selftests/ftrace/config
index 544de0db5f58..fec41c6b290e 100644
--- a/tools/testing/selftests/ftrace/config
+++ b/tools/testing/selftests/ftrace/config
@@ -1,3 +1,5 @@
+CONFIG_BOOT_CONFIG=y
+CONFIG_BOOTTIME_TRACING=y
CONFIG_BPF_SYSCALL=y
CONFIG_DEBUG_INFO_BTF=y
CONFIG_DEBUG_INFO_DWARF4=y
@@ -8,6 +10,7 @@ CONFIG_FTRACE=y
CONFIG_FTRACE_SYSCALLS=y
CONFIG_FUNCTION_GRAPH_RETVAL=y
CONFIG_FUNCTION_PROFILER=y
+CONFIG_FUNCTION_TRACER=y
CONFIG_HIST_TRIGGERS=y
CONFIG_IRQSOFF_TRACER=y
CONFIG_KALLSYMS_ALL=y
@@ -24,6 +27,7 @@ CONFIG_SAMPLE_TRACE_EVENTS=m
CONFIG_SAMPLE_TRACE_PRINTK=m
CONFIG_SCHED_TRACER=y
CONFIG_STACK_TRACER=y
+CONFIG_SYNTH_EVENTS=y
CONFIG_TRACER_SNAPSHOT=y
CONFIG_UPROBES=y
CONFIG_UPROBE_EVENTS=y
^ permalink raw reply related [flat|nested] 3+ messages in thread