[PATCH 2/2] i7core_edac: Drop the edac_mce facility

From: Borislav Petkov
Date: Mon Jul 18 2011 - 10:25:20 EST

From: Borislav Petkov <borislav.petkov@xxxxxxx>

Remove edac_mce pieces and use the normal MCE decoder notifier chain by
retaining the same functionality with considerably less code.

Cc: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
Signed-off-by: Borislav Petkov <borislav.petkov@xxxxxxx>
---
arch/x86/kernel/cpu/mcheck/mce.c | 1 -
drivers/edac/Kconfig | 3 --
drivers/edac/Makefile | 1 -
drivers/edac/edac_mce.c | 61 --------------------------------------
drivers/edac/i7core_edac.c | 51 +++++++++++++++----------------
include/linux/edac_mce.h | 31 -------------------
6 files changed, 25 insertions(+), 123 deletions(-)
delete mode 100644 drivers/edac/edac_mce.c
delete mode 100644 include/linux/edac_mce.h

diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index 019786a..63aad27 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -36,7 +36,6 @@
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/debugfs.h>
-#include <linux/edac_mce.h>
#include <linux/irq_work.h>

#include <asm/processor.h>
diff --git a/drivers/edac/Kconfig b/drivers/edac/Kconfig
index af1a17d..f888fb5 100644
--- a/drivers/edac/Kconfig
+++ b/drivers/edac/Kconfig
@@ -71,9 +71,6 @@ config EDAC_MM_EDAC
occurred so that a particular failing memory module can be
replaced. If unsure, select 'Y'.

-config EDAC_MCE
- bool
-
config EDAC_AMD64
tristate "AMD64 (Opteron, Athlon64) K8, F10h"
depends on EDAC_MM_EDAC && AMD_NB && X86_64 && EDAC_DECODE_MCE
diff --git a/drivers/edac/Makefile b/drivers/edac/Makefile
index 3e23913..b06a9b1 100644
--- a/drivers/edac/Makefile
+++ b/drivers/edac/Makefile
@@ -8,7 +8,6 @@

obj-$(CONFIG_EDAC) := edac_stub.o
obj-$(CONFIG_EDAC_MM_EDAC) += edac_core.o
-obj-$(CONFIG_EDAC_MCE) += edac_mce.o

edac_core-y := edac_mc.o edac_device.o edac_mc_sysfs.o edac_pci_sysfs.o
edac_core-y += edac_module.o edac_device_sysfs.o
diff --git a/drivers/edac/edac_mce.c b/drivers/edac/edac_mce.c
deleted file mode 100644
index 9ccdc5b..0000000
--- a/drivers/edac/edac_mce.c
+++ /dev/null
@@ -1,61 +0,0 @@
-/* Provides edac interface to mcelog events
- *
- * This file may be distributed under the terms of the
- * GNU General Public License version 2.
- *
- * Copyright (c) 2009 by:
- * Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
- *
- * Red Hat Inc. http://www.redhat.com
- */
-
-#include <linux/module.h>
-#include <linux/edac_mce.h>
-#include <asm/mce.h>
-
-int edac_mce_enabled;
-EXPORT_SYMBOL_GPL(edac_mce_enabled);
-
-
-/*
- * Extension interface
- */
-
-static LIST_HEAD(edac_mce_list);
-static DEFINE_MUTEX(edac_mce_lock);
-
-int edac_mce_register(struct edac_mce *edac_mce)
-{
- mutex_lock(&edac_mce_lock);
- list_add_tail(&edac_mce->list, &edac_mce_list);
- mutex_unlock(&edac_mce_lock);
- return 0;
-}
-EXPORT_SYMBOL(edac_mce_register);
-
-void edac_mce_unregister(struct edac_mce *edac_mce)
-{
- mutex_lock(&edac_mce_lock);
- list_del(&edac_mce->list);
- mutex_unlock(&edac_mce_lock);
-}
-EXPORT_SYMBOL(edac_mce_unregister);
-
-int edac_mce_parse(struct mce *mce)
-{
- struct edac_mce *edac_mce;
-
- list_for_each_entry(edac_mce, &edac_mce_list, list) {
- if (edac_mce->check_error(edac_mce->priv, mce))
- return 1;
- }
-
- /* Nobody queued the error */
- return 0;
-}
-EXPORT_SYMBOL_GPL(edac_mce_parse);
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>");
-MODULE_AUTHOR("Red Hat Inc. (http://www.redhat.com)");
-MODULE_DESCRIPTION("EDAC Driver for mcelog captured errors");
diff --git a/drivers/edac/i7core_edac.c b/drivers/edac/i7core_edac.c
index 04f1e7c..26171df 100644
--- a/drivers/edac/i7core_edac.c
+++ b/drivers/edac/i7core_edac.c
@@ -33,8 +33,8 @@
#include <linux/delay.h>
#include <linux/edac.h>
#include <linux/mmzone.h>
-#include <linux/edac_mce.h>
#include <linux/smp.h>
+#include <asm/mce.h>
#include <asm/processor.h>

#include "edac_core.h"
@@ -255,9 +255,6 @@ struct i7core_pvt {

unsigned int is_registered;

- /* mcelog glue */
- struct edac_mce edac_mce;
-
/* Fifo double buffers */
struct mce mce_entry[MCE_LOG_LEN];
struct mce mce_outentry[MCE_LOG_LEN];
@@ -1826,33 +1823,43 @@ check_ce_error:
* WARNING: As this routine should be called at NMI time, extra care should
* be taken to avoid deadlocks, and to be as fast as possible.
*/
-static int i7core_mce_check_error(void *priv, struct mce *mce)
+static int i7core_mce_check_error(struct notifier_block *nb, unsigned long val,
+ void *data)
{
- struct mem_ctl_info *mci = priv;
- struct i7core_pvt *pvt = mci->pvt_info;
+ struct mce *mce = (struct mce *)data;
+ struct i7core_dev *i7_dev;
+ struct mem_ctl_info *mci;
+ struct i7core_pvt *pvt;
+
+ i7_dev = get_i7core_dev(mce->socketid);
+ if (!i7_dev)
+ return NOTIFY_BAD;
+
+ mci = i7_dev->mci;
+ pvt = mci->pvt_info;

/*
* Just let mcelog handle it if the error is
* outside the memory controller
*/
if (((mce->status & 0xffff) >> 7) != 1)
- return 0;
+ return NOTIFY_DONE;

/* Bank 8 registers are the only ones that we know how to handle */
if (mce->bank != 8)
- return 0;
+ return NOTIFY_DONE;

#ifdef CONFIG_SMP
/* Only handle if it is the right mc controller */
if (cpu_data(mce->cpu).phys_proc_id != pvt->i7core_dev->socket)
- return 0;
+ return NOTIFY_DONE;
#endif

smp_rmb();
if ((pvt->mce_out + 1) % MCE_LOG_LEN == pvt->mce_in) {
smp_wmb();
pvt->mce_overrun++;
- return 0;
+ return NOTIFY_DONE;
}

/* Copy memory error at the ringbuffer */
@@ -1865,9 +1872,13 @@ static int i7core_mce_check_error(void *priv, struct mce *mce)
i7core_check_error(mci);

/* Advise mcelog that the errors were handled */
- return 1;
+ return NOTIFY_STOP;
}

+static struct notifier_block i7_mce_dec = {
+ .notifier_call = i7core_mce_check_error,
+};
+
static void i7core_pci_ctl_create(struct i7core_pvt *pvt)
{
pvt->i7core_pci = edac_pci_create_generic_ctl(
@@ -1906,8 +1917,7 @@ static void i7core_unregister_mci(struct i7core_dev *i7core_dev)
debugf0("MC: " __FILE__ ": %s(): mci = %p, dev = %p\n",
__func__, mci, &i7core_dev->pdev[0]->dev);

- /* Disable MCE NMI handler */
- edac_mce_unregister(&pvt->edac_mce);
+ atomic_notifier_chain_unregister(&x86_mce_decoder_chain, &i7_mce_dec);

/* Disable EDAC polling */
i7core_pci_ctl_release(pvt);
@@ -2002,21 +2012,10 @@ static int i7core_register_mci(struct i7core_dev *i7core_dev)
/* allocating generic PCI control info */
i7core_pci_ctl_create(pvt);

- /* Registers on edac_mce in order to receive memory errors */
- pvt->edac_mce.priv = mci;
- pvt->edac_mce.check_error = i7core_mce_check_error;
- rc = edac_mce_register(&pvt->edac_mce);
- if (unlikely(rc < 0)) {
- debugf0("MC: " __FILE__
- ": %s(): failed edac_mce_register()\n", __func__);
- goto fail1;
- }
+ atomic_notifier_chain_register(&x86_mce_decoder_chain, &i7_mce_dec);

return 0;

-fail1:
- i7core_pci_ctl_release(pvt);
- edac_mc_del_mc(mci->dev);
fail0:
kfree(mci->ctl_name);
edac_mc_free(mci);
diff --git a/include/linux/edac_mce.h b/include/linux/edac_mce.h
deleted file mode 100644
index f974fc0..0000000
--- a/include/linux/edac_mce.h
+++ /dev/null
@@ -1,31 +0,0 @@
-/* Provides edac interface to mcelog events
- *
- * This file may be distributed under the terms of the
- * GNU General Public License version 2.
- *
- * Copyright (c) 2009 by:
- * Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
- *
- * Red Hat Inc. http://www.redhat.com
- */
-
-#if defined(CONFIG_EDAC_MCE) || \
- (defined(CONFIG_EDAC_MCE_MODULE) && defined(MODULE))
-
-#include <asm/mce.h>
-#include <linux/list.h>
-
-struct edac_mce {
- struct list_head list;
-
- void *priv;
- int (*check_error)(void *priv, struct mce *mce);
-};
-
-int edac_mce_register(struct edac_mce *edac_mce);
-void edac_mce_unregister(struct edac_mce *edac_mce);
-int edac_mce_parse(struct mce *mce);
-
-#else
-#define edac_mce_parse(mce) (0)
-#endif
--
1.7.4.rc2

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