[RFC PATCH 3/3] MCE: Enable persistent event

[Borislav Petkov]

From: Borislav Petkov <bp@xxxxxxx>

... for MCEs collection.

Signed-off-by: Borislav Petkov <bp@xxxxxxx>
---
 arch/x86/kernel/cpu/mcheck/mce.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index 7bc126346ace..4f44991b38b5 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -1987,6 +1987,31 @@ int __init mcheck_init(void)
 	return 0;
 }
 
+static struct perf_event_attr pattr = {
+	.type		= PERF_TYPE_TRACEPOINT,
+	.size		= sizeof(pattr),
+	.sample_type	= PERF_SAMPLE_RAW,
+	.persistent	= 1,
+};
+
+int __init mcheck_init_tp(void)
+{
+
+	pattr.config = event_mce_record.event.type;
+	pattr.sample_period = 1;
+	pattr.wakeup_events = 1;
+
+	if (perf_add_persistent_event(&pattr, 4))
+		pr_err("Error adding MCE persistent event.\n");
+
+	return 0;
+}
+/*
+ * We can't run earlier because persistent events uses anon_inode_getfile and
+ * its anon_inode_mnt gets initialized as a fs_initcall.
+ */
+fs_initcall_sync(mcheck_init_tp);
+
 /*
  * mce_syscore: PM support
  */
-- 
1.8.1.3.535.ga923c31

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