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Subject[RFC PATCH 3/3] MCE: Enable persistent event
Date
From: Borislav Petkov <bp@suse.de>

... for MCEs collection.

Signed-off-by: Borislav Petkov <bp@suse.de>
---
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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