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Subject[PATCH 3/9] x86/mce: Convert the CEC to use the MCE notifier
Date
From: Tony Luck <tony.luck@intel.com>

The CEC code has its claws in a couple of routines in mce/core.c.
Convert it to just register itself on the normal MCE notifier chain.

[ bp: Make cec_add_elem() and cec_init() static. ]

Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20200214222720.13168-3-tony.luck@intel.com
---
arch/x86/kernel/cpu/mce/core.c | 19 -------------------
drivers/ras/cec.c | 30 ++++++++++++++++++++++++++++--
include/linux/ras.h | 5 -----
3 files changed, 28 insertions(+), 26 deletions(-)

diff --git a/arch/x86/kernel/cpu/mce/core.c b/arch/x86/kernel/cpu/mce/core.c
index 43b1519ad4e5..b033b3589630 100644
--- a/arch/x86/kernel/cpu/mce/core.c
+++ b/arch/x86/kernel/cpu/mce/core.c
@@ -544,21 +544,6 @@ bool mce_is_correctable(struct mce *m)
}
EXPORT_SYMBOL_GPL(mce_is_correctable);

-static bool cec_add_mce(struct mce *m)
-{
- if (!m)
- return false;
-
- /* We eat only correctable DRAM errors with usable addresses. */
- if (mce_is_memory_error(m) &&
- mce_is_correctable(m) &&
- mce_usable_address(m))
- if (!cec_add_elem(m->addr >> PAGE_SHIFT))
- return true;
-
- return false;
-}
-
static int mce_early_notifier(struct notifier_block *nb, unsigned long val,
void *data)
{
@@ -567,9 +552,6 @@ static int mce_early_notifier(struct notifier_block *nb, unsigned long val,
if (!m)
return NOTIFY_DONE;

- if (cec_add_mce(m))
- return NOTIFY_STOP;
-
/* Emit the trace record: */
trace_mce_record(m);

@@ -2612,7 +2594,6 @@ static int __init mcheck_late_init(void)
static_branch_inc(&mcsafe_key);

mcheck_debugfs_init();
- cec_init();

/*
* Flush out everything that has been logged during early boot, now that
diff --git a/drivers/ras/cec.c b/drivers/ras/cec.c
index c09cf55e2d20..6b42040bf956 100644
--- a/drivers/ras/cec.c
+++ b/drivers/ras/cec.c
@@ -309,7 +309,7 @@ static bool sanity_check(struct ce_array *ca)
return ret;
}

-int cec_add_elem(u64 pfn)
+static int cec_add_elem(u64 pfn)
{
struct ce_array *ca = &ce_arr;
unsigned int to = 0;
@@ -527,7 +527,30 @@ static int __init create_debugfs_nodes(void)
return 1;
}

-void __init cec_init(void)
+static int cec_notifier(struct notifier_block *nb, unsigned long val,
+ void *data)
+{
+ struct mce *m = (struct mce *)data;
+
+ if (!m)
+ return NOTIFY_DONE;
+
+ /* We eat only correctable DRAM errors with usable addresses. */
+ if (mce_is_memory_error(m) &&
+ mce_is_correctable(m) &&
+ mce_usable_address(m))
+ if (!cec_add_elem(m->addr >> PAGE_SHIFT))
+ return NOTIFY_STOP;
+
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block cec_nb = {
+ .notifier_call = cec_notifier,
+ .priority = MCE_PRIO_CEC,
+};
+
+static void __init cec_init(void)
{
if (ce_arr.disabled)
return;
@@ -546,8 +569,11 @@ void __init cec_init(void)
INIT_DELAYED_WORK(&cec_work, cec_work_fn);
schedule_delayed_work(&cec_work, CEC_DECAY_DEFAULT_INTERVAL);

+ mce_register_decode_chain(&cec_nb);
+
pr_info("Correctable Errors collector initialized.\n");
}
+late_initcall(cec_init);

int __init parse_cec_param(char *str)
{
diff --git a/include/linux/ras.h b/include/linux/ras.h
index 7c3debb47c87..1f4048bf2674 100644
--- a/include/linux/ras.h
+++ b/include/linux/ras.h
@@ -17,12 +17,7 @@ static inline int ras_add_daemon_trace(void) { return 0; }
#endif

#ifdef CONFIG_RAS_CEC
-void __init cec_init(void);
int __init parse_cec_param(char *str);
-int cec_add_elem(u64 pfn);
-#else
-static inline void __init cec_init(void) { }
-static inline int cec_add_elem(u64 pfn) { return -ENODEV; }
#endif

#ifdef CONFIG_RAS
--
2.21.0
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