Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx>
CC: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CC: Paul Turner <pjt@xxxxxxxxxx>
CC: Andrew Hunter <ahh@xxxxxxxxxx>
CC: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
CC: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
CC: Andi Kleen <andi@xxxxxxxxxxxxxx>
CC: Dave Watson <davejwatson@xxxxxx>
CC: Chris Lameter <cl@xxxxxxxxx>
CC: Ingo Molnar <mingo@xxxxxxxxxx>
CC: "H. Peter Anvin" <hpa@xxxxxxxxx>
CC: Ben Maurer <bmaurer@xxxxxx>
CC: Steven Rostedt <rostedt@xxxxxxxxxxx>
CC: "Paul E. McKenney" <paulmck@xxxxxxxxxxxxxxxxxx>
CC: Josh Triplett <josh@xxxxxxxxxxxxxxxx>
CC: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
CC: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
CC: Russell King <linux@xxxxxxxxxxxxxxxx>
CC: Catalin Marinas <catalin.marinas@xxxxxxx>
CC: Will Deacon <will.deacon@xxxxxxx>
CC: Michael Kerrisk <mtk.manpages@xxxxxxxxx>
CC: Boqun Feng <boqun.feng@xxxxxxxxx>
CC: linux-api@xxxxxxxxxxxxxxx
---
include/trace/events/rseq.h | 64 +++++++++++++++++++++++++++++++++++++++++++++
kernel/rseq.c | 11 +++++++-
2 files changed, 74 insertions(+), 1 deletion(-)
create mode 100644 include/trace/events/rseq.h
diff --git a/include/trace/events/rseq.h b/include/trace/events/rseq.h
new file mode 100644
index 0000000..63a8eb7
--- /dev/null
+++ b/include/trace/events/rseq.h
@@ -0,0 +1,64 @@
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM rseq
+
+#if !defined(_TRACE_RSEQ_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_RSEQ_H
+
+#include <linux/tracepoint.h>
+#include <linux/types.h>
+
+TRACE_EVENT(rseq_update,
+
+ TP_PROTO(struct task_struct *t),
+
+ TP_ARGS(t),
+
+ TP_STRUCT__entry(
+ __field(s32, cpu_id)
+ __field(u32, event_counter)
+ ),
+
+ TP_fast_assign(
+ __entry->cpu_id = raw_smp_processor_id();
+ __entry->event_counter = t->rseq_event_counter;
+ ),
+
+ TP_printk("cpu_id=%d event_counter=%u",
+ __entry->cpu_id, __entry->event_counter)
+);
+
+TRACE_EVENT(rseq_ip_fixup,
+
+ TP_PROTO(void __user *regs_ip, void __user *start_ip,
+ void __user *post_commit_ip, void __user *abort_ip,
+ u32 kevcount, int ret),
+
+ TP_ARGS(regs_ip, start_ip, post_commit_ip, abort_ip, kevcount, ret),
+
+ TP_STRUCT__entry(
+ __field(void __user *, regs_ip)
+ __field(void __user *, start_ip)
+ __field(void __user *, post_commit_ip)
+ __field(void __user *, abort_ip)
+ __field(u32, kevcount)
+ __field(int, ret)
+ ),
+
+ TP_fast_assign(
+ __entry->regs_ip = regs_ip;
+ __entry->start_ip = start_ip;
+ __entry->post_commit_ip = post_commit_ip;
+ __entry->abort_ip = abort_ip;
+ __entry->kevcount = kevcount;
+ __entry->ret = ret;
+ ),
+
+ TP_printk("regs_ip=%p start_ip=%p post_commit_ip=%p abort_ip=%p kevcount=%u ret=%d",
+ __entry->regs_ip, __entry->start_ip, __entry->post_commit_ip,
+ __entry->abort_ip, __entry->kevcount, __entry->ret)
+);
+
+#endif /* _TRACE_SOCK_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
diff --git a/kernel/rseq.c b/kernel/rseq.c
index 32bc1d2..a102fcc 100644
--- a/kernel/rseq.c
+++ b/kernel/rseq.c
@@ -32,6 +32,9 @@
#include <linux/types.h>
#include <asm/ptrace.h>
+#define CREATE_TRACE_POINTS
+#include <trace/events/rseq.h>
+
/*
* The restartable sequences mechanism is the overlap of two distinct
* restart mechanisms: a sequence counter tracking preemption and signal
@@ -137,6 +140,7 @@ static bool rseq_update_cpu_id_event_counter(struct task_struct *t)
u.e.event_counter = ++t->rseq_event_counter;
if (__put_user(u.v, &t->rseq->u.v))
return false;
+ trace_rseq_update(t);
return true;
}
@@ -168,8 +172,13 @@ static bool rseq_ip_fixup(struct pt_regs *regs)
void __user *start_ip = NULL;
void __user *post_commit_ip = NULL;
void __user *abort_ip = NULL;
+ bool ret;
- if (!rseq_get_rseq_cs(t, &start_ip, &post_commit_ip, &abort_ip))
+ ret = rseq_get_rseq_cs(t, &start_ip, &post_commit_ip, &abort_ip);
+ trace_rseq_ip_fixup((void __user *)instruction_pointer(regs),
+ start_ip, post_commit_ip, abort_ip, t->rseq_event_counter,
+ ret);
+ if (!ret)
return false;
/* Handle potentially not being within a critical section. */
--
2.1.4
--
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