[PATCH 0/3] i7core_edac and edac_mce

[PATCH 0/3] i7core_edac and edac_mce

[Mauro Carvalho Chehab]

As pointed By Arjan, Hidetoshi and Borislav, the edac glue had the
risk of causing dead locks with NMI code. Due to that, I'm submitting
a patch that replaces it to use, instead, a ringbuffer.

I also found a bug at the new edac sysfs methods when more than one memory 
controller were used, and added a small patch to improve error injection
address mask.

Please review.

The entire patch series is available at:
	git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/i7core.git for_linus

Cheers,
Maur

-- 

Cheers,
Mauro

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[PATCH 3/3] i7core_edac: Better parse "any" addrmask

[Mauro Carvalho Chehab]

>From ddc7940d3a68483e750e286bfe78d52bdf9231d1 Mon Sep 17 00:00:00 2001
From: Mauro Carvalho Chehab <mchehab@redhat.com>
Date: Sun, 4 Oct 2009 11:54:56 -0300
Subject: [PATCH] i7core_edac: Better parse "any" addrmask

Instead of accepting just "any", accept also "any\n"

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
---
 drivers/edac/i7core_edac.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/edac/i7core_edac.c b/drivers/edac/i7core_edac.c
index 94aeca0..477b62a 100644
--- a/drivers/edac/i7core_edac.c
+++ b/drivers/edac/i7core_edac.c
@@ -800,7 +800,7 @@ static ssize_t i7core_inject_store_##param(			\
 	if (pvt->inject.enable)					\
 		disable_inject(mci);				\
 								\
-	if (!strcasecmp(data, "any"))				\
+	if (!strcasecmp(data, "any") || !strcasecmp(data, "any\n"))\
 		value = -1;					\
 	else {							\
 		rc = strict_strtoul(data, 10, &value);		

-- 

Cheers,
Mauro

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[PATCH 2/3] i7core_edac: Use a lockless ringbuffer

[Mauro Carvalho Chehab]

>From ece799f1fbe9af74c518c00ab5dd271ba9eb8855 Mon Sep 17 00:00:00 2001
From: Mauro Carvalho Chehab <mchehab@redhat.com>
Date: Sun, 4 Oct 2009 10:15:40 -0300
Subject: [PATCH] i7core_edac: Use a lockless ringbuffer

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
---
 drivers/edac/i7core_edac.c |   83 +++++++++++++++++++++++++++++---------------
 1 files changed, 55 insertions(+), 28 deletions(-)

diff --git a/drivers/edac/i7core_edac.c b/drivers/edac/i7core_edac.c
index 97f6d17..94aeca0 100644
--- a/drivers/edac/i7core_edac.c
+++ b/drivers/edac/i7core_edac.c
@@ -28,7 +28,6 @@
 #include <linux/edac.h>
 #include <linux/mmzone.h>
 #include <linux/edac_mce.h>
-#include <linux/spinlock.h>
 #include <linux/smp.h>
 #include <asm/processor.h>
 
@@ -239,9 +238,16 @@ struct i7core_pvt {
 
 	/* mcelog glue */
 	struct edac_mce		edac_mce;
+
+	/* Fifo double buffers */
 	struct mce		mce_entry[MCE_LOG_LEN];
-	unsigned		mce_count;
-	spinlock_t		mce_lock;
+	struct mce		mce_outentry[MCE_LOG_LEN];
+
+	/* Fifo in/out counters */
+	unsigned		mce_in, mce_out;
+
+	/* Count indicator to show errors not got */
+	unsigned		mce_overrun;
 };
 
 /* Static vars */
@@ -1617,30 +1623,50 @@ static void i7core_check_error(struct mem_ctl_info *mci)
 	struct i7core_pvt *pvt = mci->pvt_info;
 	int i;
 	unsigned count = 0;
-	struct mce *m = NULL;
-	unsigned long flags;
+	struct mce *m;
 
-	/* Copy all mce errors into a temporary buffer */
-	spin_lock_irqsave(&pvt->mce_lock, flags);
-	if (pvt->mce_count) {
-		m = kmalloc(sizeof(*m) * pvt->mce_count, GFP_ATOMIC);
+	/*
+	 * MCE first step: Copy all mce errors into a temporary buffer
+	 * We use a double buffering here, to reduce the risk of
+	 * loosing an error.
+	 */
+	smp_rmb();
+	count = (pvt->mce_out + sizeof(mce_entry) - pvt->mce_in)
+		% sizeof(mce_entry);
+	if (!count)
+		return;
 
-		if (m) {
-			count = pvt->mce_count;
-			memcpy(m, &pvt->mce_entry, sizeof(*m) * count);
-		}
-		pvt->mce_count = 0;
-	}
+	m = pvt->mce_outentry;
+	if (pvt->mce_in + count > sizeof(mce_entry)) {
+		unsigned l = sizeof(mce_entry) - pvt->mce_in;
 
-	spin_unlock_irqrestore(&pvt->mce_lock, flags);
+		memcpy(m, &pvt->mce_entry[pvt->mce_in], sizeof(*m) * l);
+		smp_wmb();
+		pvt->mce_in = 0;
+		count -= l;
+		m += l;
+	}
+	memcpy(m, &pvt->mce_entry[pvt->mce_in], sizeof(*m) * count);
+	smp_wmb();
+	pvt->mce_in += count;
+
+	smp_rmb();
+	if (pvt->mce_overrun) {
+		i7core_printk(KERN_ERR, "Lost %d memory errors\n",
+			      pvt->mce_overrun);
+		smp_wmb();
+		pvt->mce_overrun = 0;
+	}
 
-	/* proccess mcelog errors */
+	/*
+	 * MCE second step: parse errors and display
+	 */
 	for (i = 0; i < count; i++)
-		i7core_mce_output_error(mci, &m[i]);
+		i7core_mce_output_error(mci, &pvt->mce_outentry[i]);
 
-	kfree(m);
-
-	/* check memory count errors */
+	/*
+	 * Now, let's increment CE error counts
+	 */
 	if (!pvt->is_registered)
 		i7core_udimm_check_mc_ecc_err(mci);
 	else
@@ -1657,7 +1683,6 @@ static int i7core_mce_check_error(void *priv, struct mce *mce)
 {
 	struct mem_ctl_info *mci = priv;
 	struct i7core_pvt *pvt = mci->pvt_info;
-	unsigned long flags;
 
 	/*
 	 * Just let mcelog handle it if the error is
@@ -1679,12 +1704,15 @@ static int i7core_mce_check_error(void *priv, struct mce *mce)
 		return 0;
 	}
 
-	spin_lock_irqsave(&pvt->mce_lock, flags);
-	if (pvt->mce_count < MCE_LOG_LEN) {
-		memcpy(&pvt->mce_entry[pvt->mce_count], mce, sizeof(*mce));
-		pvt->mce_count++;
+	smp_rmb();
+	if ((pvt->mce_out + 1) % sizeof(mce_entry) == pvt->mce_in) {
+		smp_wmb();
+		pvt->mce_overrun++;
+		return 0;
 	}
-	spin_unlock_irqrestore(&pvt->mce_lock, flags);
+	smp_wmb();
+	pvt->mce_out = (pvt->mce_out + 1) % sizeof(mce_entry);
+	memcpy(&pvt->mce_entry[pvt->mce_out], mce, sizeof(*mce));
 
 	/* Handle fatal errors immediately */
 	if (mce->mcgstatus & 1)
@@ -1777,7 +1805,6 @@ static int i7core_register_mci(struct i7core_dev *i7core_dev,
 	/* Registers on edac_mce in order to receive memory errors */
 	pvt->edac_mce.priv = mci;
 	pvt->edac_mce.check_error = i7core_mce_check_error;
-	spin_lock_init(&pvt->mce_lock);
 
 	rc = edac_mce_register(&pvt->edac_mce);
 	if (unlikely(rc < 0)) 

-- 

Cheers,
Mauro

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[PATCH 1/3] edac: Create an unique instance for each kobj

[Mauro Carvalho Chehab]

Current code only works when there's just one memory
controller, since we need one kobj for each instance.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
---
 drivers/edac/edac_core.h     |   21 ++++++++---
 drivers/edac/edac_mc_sysfs.c |   75 +++++++++++++++++++++++++++--------------
 2 files changed, 64 insertions(+), 32 deletions(-)

diff --git a/drivers/edac/edac_core.h b/drivers/edac/edac_core.h
index d035ee9..f84da6e 100644
--- a/drivers/edac/edac_core.h
+++ b/drivers/edac/edac_core.h
@@ -341,23 +341,29 @@ struct csrow_info {
 };
 
 struct mcidev_sysfs_group {
-	const char *name;
-	struct mcidev_sysfs_attribute *mcidev_attr;
-	struct kobject kobj;
+	const char *name;				/* group name */
+	struct mcidev_sysfs_attribute *mcidev_attr;	/* group attributes */
+};
+
+struct mcidev_sysfs_group_kobj {
+	struct list_head list;		/* list for all instances within a mc */
+
+	struct kobject kobj;		/* kobj for the group */
 
+	struct mcidev_sysfs_group *grp;	/* group description table */
 	struct mem_ctl_info *mci;	/* the parent */
 };
 
-
 /* mcidev_sysfs_attribute structure
  *	used for driver sysfs attributes and in mem_ctl_info
  * 	sysfs top level entries
  */
 struct mcidev_sysfs_attribute {
+	/* It should use either attr or grp */
 	struct attribute attr;
+	struct mcidev_sysfs_group *grp;	/* Points to a group of attributes */
 
-	struct mcidev_sysfs_group *grp;
-
+	/* Ops for show/store values at the attribute - not used on group */
         ssize_t (*show)(struct mem_ctl_info *,char *);
         ssize_t (*store)(struct mem_ctl_info *, const char *,size_t);
 };
@@ -435,6 +441,9 @@ struct mem_ctl_info {
 	/* edac sysfs device control */
 	struct kobject edac_mci_kobj;
 
+	/* list for all grp instances within a mc */
+	struct list_head grp_kobj_list;
+
 	/* Additional top controller level attributes, but specified
 	 * by the low level driver.
 	 *
diff --git a/drivers/edac/edac_mc_sysfs.c b/drivers/edac/edac_mc_sysfs.c
index 473246b..299547c 100644
--- a/drivers/edac/edac_mc_sysfs.c
+++ b/drivers/edac/edac_mc_sysfs.c
@@ -729,7 +729,7 @@ void edac_mc_unregister_sysfs_main_kobj(struct mem_ctl_info *mci)
 
 #define EDAC_DEVICE_SYMLINK	"device"
 
-#define grp_to_mci(k) (container_of(k, struct mcidev_sysfs_group, kobj)->mci)
+#define grp_to_mci(k) (container_of(k, struct mcidev_sysfs_group_kobj, kobj)->mci)
 
 /* MCI show/store functions for top most object */
 static ssize_t inst_grp_show(struct kobject *kobj, struct attribute *attr,
@@ -763,12 +763,12 @@ static ssize_t inst_grp_store(struct kobject *kobj, struct attribute *attr,
 /* No memory to release for this kobj */
 static void edac_inst_grp_release(struct kobject *kobj)
 {
-	struct mcidev_sysfs_group *grp;
+	struct mcidev_sysfs_group_kobj *grp;
 	struct mem_ctl_info *mci;
 
 	debugf1("%s()\n", __func__);
 
-	grp = container_of(kobj, struct mcidev_sysfs_group, kobj);
+	grp = container_of(kobj, struct mcidev_sysfs_group_kobj, kobj);
 	mci = grp->mci;
 
 	kobject_put(&mci->edac_mci_kobj);
@@ -803,22 +803,30 @@ static int edac_create_mci_instance_attributes(struct mem_ctl_info *mci,
 
 	while (sysfs_attrib) {
 		if (sysfs_attrib->grp) {
-			struct kobject *newkobj = &sysfs_attrib->grp->kobj;
+			struct mcidev_sysfs_group_kobj *grp_kobj;
+
+			grp_kobj = kzalloc(sizeof(*grp_kobj), GFP_KERNEL);
+			if (!grp_kobj)
+				return -ENOMEM;
+
+			list_add_tail(&grp_kobj->list, &mci->grp_kobj_list);
+
+			grp_kobj->grp = sysfs_attrib->grp;
+			grp_kobj->mci = mci;
 
 			debugf0("%s() grp %s, mci %p\n", __func__,
 				sysfs_attrib->grp->name, mci);
 
-			sysfs_attrib->grp->mci = mci;
-
-			err = kobject_init_and_add(newkobj, &ktype_inst_grp,
+			err = kobject_init_and_add(&grp_kobj->kobj,
+						&ktype_inst_grp,
 						&mci->edac_mci_kobj,
 						sysfs_attrib->grp->name);
 			if (err)
 				return err;
 
 			err = edac_create_mci_instance_attributes(mci,
-					sysfs_attrib->grp->mcidev_attr,
-					newkobj);
+					grp_kobj->grp->mcidev_attr,
+					&grp_kobj->kobj);
 
 			if (err)
 				return err;
@@ -844,25 +852,27 @@ static int edac_create_mci_instance_attributes(struct mem_ctl_info *mci,
  *	remove MC driver specific attributes at the topmost level
  *	directory of this mci instance.
  */
-static void edac_remove_mci_instance_attributes(
+static void edac_remove_mci_instance_attributes(struct mem_ctl_info *mci,
 				struct mcidev_sysfs_attribute *sysfs_attrib,
-				struct kobject *kobj)
+				struct kobject *kobj, int count)
 {
+	struct mcidev_sysfs_group_kobj *grp_kobj, *tmp;
+
 	debugf1("%s()\n", __func__);
 
-	/* loop if there are attributes and until we hit a NULL entry */
+	/*
+	 * loop if there are attributes and until we hit a NULL entry
+	 * Remove first all the atributes
+	 */
 	while (sysfs_attrib) {
 		if (sysfs_attrib->grp) {
-			struct kobject *newkobj = &sysfs_attrib->grp->kobj;
-
-			debugf0("%s() grp %s\n", __func__,
-				sysfs_attrib->grp->name);
-
-			edac_remove_mci_instance_attributes(
-				sysfs_attrib->grp->mcidev_attr, newkobj);
-
-			kobject_put(newkobj);
-		} else  if (sysfs_attrib->attr.name) {
+			list_for_each_entry(grp_kobj, &mci->grp_kobj_list,
+					    list)
+				if (grp_kobj->grp == sysfs_attrib->grp)
+					edac_remove_mci_instance_attributes(mci,
+						    grp_kobj->grp->mcidev_attr,
+						    &grp_kobj->kobj, count + 1);
+		} else if (sysfs_attrib->attr.name) {
 			debugf0("%s() file %s\n", __func__,
 				sysfs_attrib->attr.name);
 			sysfs_remove_file(kobj, &sysfs_attrib->attr);
@@ -870,6 +880,16 @@ static void edac_remove_mci_instance_attributes(
 			break;
 		sysfs_attrib++;
 	}
+
+	/*
+	 * Now that all attributes got removed, it is save to remove all groups
+	 */
+	if (!count)
+		list_for_each_entry_safe(grp_kobj, tmp, &mci->grp_kobj_list,
+					 list) {
+			debugf0("%s() grp %s\n", __func__, grp_kobj->grp->name);
+			kobject_put(&grp_kobj->kobj);
+		}
 }
 
 
@@ -890,6 +910,8 @@ int edac_create_sysfs_mci_device(struct mem_ctl_info *mci)
 
 	debugf0("%s() idx=%d\n", __func__, mci->mc_idx);
 
+	INIT_LIST_HEAD(&mci->grp_kobj_list);
+
 	/* create a symlink for the device */
 	err = sysfs_create_link(kobj_mci, &mci->dev->kobj,
 				EDAC_DEVICE_SYMLINK);
@@ -939,8 +961,8 @@ fail1:
 	}
 
 	/* remove the mci instance's attributes, if any */
-	edac_remove_mci_instance_attributes(
-		mci->mc_driver_sysfs_attributes, &mci->edac_mci_kobj);
+	edac_remove_mci_instance_attributes(mci,
+		mci->mc_driver_sysfs_attributes, &mci->edac_mci_kobj, 0);
 
 	/* remove the symlink */
 	sysfs_remove_link(kobj_mci, EDAC_DEVICE_SYMLINK);
@@ -974,8 +996,9 @@ void edac_remove_sysfs_mci_device(struct mem_ctl_info *mci)
 	debugf0("%s()  remove_mci_instance\n", __func__);
 
 	/* remove this mci instance's attribtes */
-	edac_remove_mci_instance_attributes(mci->mc_driver_sysfs_attributes,
-					    &mci->edac_mci_kobj);
+	edac_remove_mci_instance_attributes(mci,
+					    mci->mc_driver_sysfs_attributes,
+					    &mci->edac_mci_kobj, 0);
 	debugf0("%s()  unregister this mci kobj\n", __func__);
 
 	/* unregister this instance's kobject *

-- 

Cheers,
Mauro

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Re: [PATCH 1/3] edac: Create an unique instance for each kobj

[Andrew Morton]

On Sun, 4 Oct 2009 16:43:54 -0300 Mauro Carvalho Chehab <mchehab@redhat.com> wrote:

> Current code only works when there's just one memory
> controller, since we need one kobj for each instance.
> 
> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
> ---
>  drivers/edac/edac_core.h     |   21 ++++++++---
>  drivers/edac/edac_mc_sysfs.c |   75 +++++++++++++++++++++++++++--------------
>  2 files changed, 64 insertions(+), 32 deletions(-)
> 
> diff --git a/drivers/edac/edac_core.h b/drivers/edac/edac_core.h
> index d035ee9..f84da6e 100644
> --- a/drivers/edac/edac_core.h
> +++ b/drivers/edac/edac_core.h
> @@ -341,23 +341,29 @@ struct csrow_info {
>  };
>  
>  struct mcidev_sysfs_group {
> -	const char *name;
> -	struct mcidev_sysfs_attribute *mcidev_attr;
> -	struct kobject kobj;
> +	const char *name;				/* group name */
> +	struct mcidev_sysfs_attribute *mcidev_attr;	/* group attributes */
> +};
> +
> +struct mcidev_sysfs_group_kobj {
> +	struct list_head list;		/* list for all instances within a mc */
> +
> +	struct kobject kobj;		/* kobj for the group */
>  
> +	struct mcidev_sysfs_group *grp;	/* group description table */
>  	struct mem_ctl_info *mci;	/* the parent */
>  };

I don't know which kernel you're patching here, but it doesn't look
anything like mine...

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Re: [PATCH 1/3] edac: Create an unique instance for each kobj

[Mauro Carvalho Chehab]

Hi Andrew,

Em Tue, 13 Oct 2009 20:01:17 -0700
Andrew Morton <akpm@linux-foundation.org> escreveu:

> On Sun, 4 Oct 2009 16:43:54 -0300 Mauro Carvalho Chehab <mchehab@redhat.com> wrote:
> 
> > Current code only works when there's just one memory
> > controller, since we need one kobj for each instance.
> 
> I don't know which kernel you're patching here, but it doesn't look
> anything like mine...

It is on i7core_edac git tree. This tree were added to linux-next. You'll be
able to see it starting from today's linux-next.

Cheers,
Mauro

------------------------------------------------------------------------------
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RE: [PATCH 1/3] edac: Create an unique instance for each kobj

[Colbert, Rusty]

Is this all into a dev tree, or are there patches for a SLES 11 (2.6.27) ?

-----Original Message-----
From: Mauro Carvalho Chehab [mailto:mchehab@redhat.com]
Sent: Wednesday, October 14, 2009 4:42 AM
To: Andrew Morton
Cc: Ingo Molnar; bluesmoke-devel@lists.sourceforge.net; linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/3] edac: Create an unique instance for each kobj

Hi Andrew,

Em Tue, 13 Oct 2009 20:01:17 -0700
Andrew Morton <akpm@linux-foundation.org> escreveu:

> On Sun, 4 Oct 2009 16:43:54 -0300 Mauro Carvalho Chehab <mchehab@redhat.com> wrote:
>
> > Current code only works when there's just one memory
> > controller, since we need one kobj for each instance.
>
> I don't know which kernel you're patching here, but it doesn't look
> anything like mine...

It is on i7core_edac git tree. This tree were added to linux-next. You'll be
able to see it starting from today's linux-next.

Cheers,
Mauro

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Re: [PATCH 1/3] edac: Create an unique instance for each kobj

[Mauro Carvalho Chehab]

Em Wed, 14 Oct 2009 14:50:10 +0000
"Colbert, Rusty" <rusty.colbert@hp.com> escreveu:

> Is this all into a dev tree, or are there patches for a SLES 11 (2.6.27) ?

The patches at i7core_edac git tree aren't upstream. They are only at
development trees.
> 
> -----Original Message-----
> From: Mauro Carvalho Chehab [mailto:mchehab@redhat.com]
> Sent: Wednesday, October 14, 2009 4:42 AM
> To: Andrew Morton
> Cc: Ingo Molnar; bluesmoke-devel@lists.sourceforge.net; linux-kernel@vger.kernel.org
> Subject: Re: [PATCH 1/3] edac: Create an unique instance for each kobj
> 
> Hi Andrew,
> 
> Em Tue, 13 Oct 2009 20:01:17 -0700
> Andrew Morton <akpm@linux-foundation.org> escreveu:
> 
> > On Sun, 4 Oct 2009 16:43:54 -0300 Mauro Carvalho Chehab <mchehab@redhat.com> wrote:
> >
> > > Current code only works when there's just one memory
> > > controller, since we need one kobj for each instance.
> >
> > I don't know which kernel you're patching here, but it doesn't look
> > anything like mine...
> 
> It is on i7core_edac git tree. This tree were added to linux-next. You'll be
> able to see it starting from today's linux-next.
> 
> Cheers,
> Mauro
> 
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-- 

Cheers,
Mauro

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