ftrace/samples: Add module to test multi direct modify interface

Adding ftrace-direct-multi-modify.ko kernel module that uses
modify_ftrace_direct_multi API. The core functionality is taken
from ftrace-direct-modify.ko kernel module and changed to fit
multi direct interface.

The init function creates kthread that periodically calls
modify_ftrace_direct_multi to change the trampoline address
for the direct ftrace_ops. The ftrace trace_pipe then shows
trace from both trampolines.

Link: https://lkml.kernel.org/r/20211206182032.87248-4-jolsa@kernel.org
Cc: Ingo Molnar <mingo@redhat.com>
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Tested-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

diff --git a/samples/ftrace/Makefile b/samples/ftrace/Makefile
index b9198e2..faf8cdb 100644 (file)
--- a/samples/ftrace/Makefile
+++ b/samples/ftrace/Makefile
@@ -4,6 +4,7 @@ obj-$(CONFIG_SAMPLE_FTRACE_DIRECT) += ftrace-direct.o
 obj-$(CONFIG_SAMPLE_FTRACE_DIRECT) += ftrace-direct-too.o
 obj-$(CONFIG_SAMPLE_FTRACE_DIRECT) += ftrace-direct-modify.o
 obj-$(CONFIG_SAMPLE_FTRACE_DIRECT_MULTI) += ftrace-direct-multi.o
+obj-$(CONFIG_SAMPLE_FTRACE_DIRECT_MULTI) += ftrace-direct-multi-modify.o
 
 CFLAGS_sample-trace-array.o := -I$(src)
 obj-$(CONFIG_SAMPLE_TRACE_ARRAY) += sample-trace-array.o

diff --git a/samples/ftrace/ftrace-direct-multi-modify.c b/samples/ftrace/ftrace-direct-multi-modify.c
new file mode 100644 (file)
index 0000000..91bc42a
--- /dev/null
+++ b/samples/ftrace/ftrace-direct-multi-modify.c
@@ -0,0 +1,152 @@
+// SPDX-License-Identifier: GPL-2.0-only
+#include <linux/module.h>
+#include <linux/kthread.h>
+#include <linux/ftrace.h>
+#include <asm/asm-offsets.h>
+
+void my_direct_func1(unsigned long ip)
+{
+       trace_printk("my direct func1 ip %lx\n", ip);
+}
+
+void my_direct_func2(unsigned long ip)
+{
+       trace_printk("my direct func2 ip %lx\n", ip);
+}
+
+extern void my_tramp1(void *);
+extern void my_tramp2(void *);
+
+#ifdef CONFIG_X86_64
+
+asm (
+"      .pushsection    .text, \"ax\", @progbits\n"
+"      .type           my_tramp1, @function\n"
+"      .globl          my_tramp1\n"
+"   my_tramp1:"
+"      pushq %rbp\n"
+"      movq %rsp, %rbp\n"
+"      pushq %rdi\n"
+"      movq 8(%rbp), %rdi\n"
+"      call my_direct_func1\n"
+"      popq %rdi\n"
+"      leave\n"
+"      ret\n"
+"      .size           my_tramp1, .-my_tramp1\n"
+"      .type           my_tramp2, @function\n"
+"\n"
+"      .globl          my_tramp2\n"
+"   my_tramp2:"
+"      pushq %rbp\n"
+"      movq %rsp, %rbp\n"
+"      pushq %rdi\n"
+"      movq 8(%rbp), %rdi\n"
+"      call my_direct_func2\n"
+"      popq %rdi\n"
+"      leave\n"
+"      ret\n"
+"      .size           my_tramp2, .-my_tramp2\n"
+"      .popsection\n"
+);
+
+#endif /* CONFIG_X86_64 */
+
+#ifdef CONFIG_S390
+
+asm (
+"       .pushsection    .text, \"ax\", @progbits\n"
+"       .type           my_tramp1, @function\n"
+"       .globl          my_tramp1\n"
+"   my_tramp1:"
+"       lgr             %r1,%r15\n"
+"       stmg            %r0,%r5,"__stringify(__SF_GPRS)"(%r15)\n"
+"       stg             %r14,"__stringify(__SF_GPRS+8*8)"(%r15)\n"
+"       aghi            %r15,"__stringify(-STACK_FRAME_OVERHEAD)"\n"
+"       stg             %r1,"__stringify(__SF_BACKCHAIN)"(%r15)\n"
+"       lgr             %r2,%r0\n"
+"       brasl           %r14,my_direct_func1\n"
+"       aghi            %r15,"__stringify(STACK_FRAME_OVERHEAD)"\n"
+"       lmg             %r0,%r5,"__stringify(__SF_GPRS)"(%r15)\n"
+"       lg              %r14,"__stringify(__SF_GPRS+8*8)"(%r15)\n"
+"       lgr             %r1,%r0\n"
+"       br              %r1\n"
+"       .size           my_tramp1, .-my_tramp1\n"
+"\n"
+"       .type           my_tramp2, @function\n"
+"       .globl          my_tramp2\n"
+"   my_tramp2:"
+"       lgr             %r1,%r15\n"
+"       stmg            %r0,%r5,"__stringify(__SF_GPRS)"(%r15)\n"
+"       stg             %r14,"__stringify(__SF_GPRS+8*8)"(%r15)\n"
+"       aghi            %r15,"__stringify(-STACK_FRAME_OVERHEAD)"\n"
+"       stg             %r1,"__stringify(__SF_BACKCHAIN)"(%r15)\n"
+"       lgr             %r2,%r0\n"
+"       brasl           %r14,my_direct_func2\n"
+"       aghi            %r15,"__stringify(STACK_FRAME_OVERHEAD)"\n"
+"       lmg             %r0,%r5,"__stringify(__SF_GPRS)"(%r15)\n"
+"       lg              %r14,"__stringify(__SF_GPRS+8*8)"(%r15)\n"
+"       lgr             %r1,%r0\n"
+"       br              %r1\n"
+"       .size           my_tramp2, .-my_tramp2\n"
+"       .popsection\n"
+);
+
+#endif /* CONFIG_S390 */
+
+static unsigned long my_tramp = (unsigned long)my_tramp1;
+static unsigned long tramps[2] = {
+       (unsigned long)my_tramp1,
+       (unsigned long)my_tramp2,
+};
+
+static struct ftrace_ops direct;
+
+static int simple_thread(void *arg)
+{
+       static int t;
+       int ret = 0;
+
+       while (!kthread_should_stop()) {
+               set_current_state(TASK_INTERRUPTIBLE);
+               schedule_timeout(2 * HZ);
+
+               if (ret)
+                       continue;
+               t ^= 1;
+               ret = modify_ftrace_direct_multi(&direct, tramps[t]);
+               if (!ret)
+                       my_tramp = tramps[t];
+               WARN_ON_ONCE(ret);
+       }
+
+       return 0;
+}
+
+static struct task_struct *simple_tsk;
+
+static int __init ftrace_direct_multi_init(void)
+{
+       int ret;
+
+       ftrace_set_filter_ip(&direct, (unsigned long) wake_up_process, 0, 0);
+       ftrace_set_filter_ip(&direct, (unsigned long) schedule, 0, 0);
+
+       ret = register_ftrace_direct_multi(&direct, my_tramp);
+
+       if (!ret)
+               simple_tsk = kthread_run(simple_thread, NULL, "event-sample-fn");
+       return ret;
+}
+
+static void __exit ftrace_direct_multi_exit(void)
+{
+       kthread_stop(simple_tsk);
+       unregister_ftrace_direct_multi(&direct, my_tramp);
+}
+
+module_init(ftrace_direct_multi_init);
+module_exit(ftrace_direct_multi_exit);
+
+MODULE_AUTHOR("Jiri Olsa");
+MODULE_DESCRIPTION("Example use case of using modify_ftrace_direct_multi()");
+MODULE_LICENSE("GPL");