Commit 9cbc6d38 authored by Niklas Söderlund's avatar Niklas Söderlund Committed by Mauro Carvalho Chehab
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i5100_edac: connect fault injection to debugfs node 



Create a debugfs direcotry i5100_edac/mcX for each memory controller and
add nodes to control how fault injection is preformed.

After configuring an injection using inject_channel, inject_deviceptr1,
inject_deviceptr2, inject_eccmask1, inject_eccmask2 and inject_hlinesel
trigger the injection by writing anything to inject_enable.

Example of a CE injection:

echo 0 > /sys/kernel/debug/i5100_edac/mc0/inject_channel
echo 1 > /sys/kernel/debug/i5100_edac/mc0/inject_hlinesel
echo 61440 > /sys/kernel/debug/i5100_edac/mc0/inject_eccmask1
echo 1 > /sys/kernel/debug/i5100_edac/mc0/inject_enable

Example of UE injection:

echo 0 > /sys/kernel/debug/i5100_edac/mc0/inject_channel
echo 2 > /sys/kernel/debug/i5100_edac/mc0/inject_hlinesel
echo 65535 > /sys/kernel/debug/i5100_edac/mc0/inject_eccmask1
echo 65535 > /sys/kernel/debug/i5100_edac/mc0/inject_eccmask2
echo 17 > /sys/kernel/debug/i5100_edac/mc0/inject_deviceptr1
echo 0 > /sys/kernel/debug/i5100_edac/mc0/inject_deviceptr2
echo 1 > /sys/kernel/debug/i5100_edac/mc0/inject_enable

Sometimes it is needed to enable the injection more then once (echo to
the inject_enable node) for the injection to happen, I am not sure why.

Signed-off-by: default avatarNiklas Söderlund <niklas.soderlund@ericsson.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
parent 53ceafd6

drivers/edac/i5100_edac.c

+70 −1
Original line number Diff line number Diff line
@@ -27,6 +27,7 @@ 
#include <linux/edac.h>

#include <linux/delay.h>

#include <linux/mmzone.h>

#include <linux/debugfs.h>



#include "edac_core.h"
@@ -360,8 +361,12 @@ struct i5100_priv { 
	u8 inject_deviceptr2;

	u16 inject_eccmask1;

	u16 inject_eccmask2;



	struct dentry *debugfs;

};



static struct dentry *i5100_debugfs;



/* map a rank/chan to a slot number on the mainboard */

static int i5100_rank_to_slot(const struct mem_ctl_info *mci,

			      int chan, int rank)
@@ -944,6 +949,61 @@ static void i5100_do_inject(struct mem_ctl_info *mci) 
	pci_write_config_byte(priv->einj, I5100_DINJ0, 0xab);

}



#define to_mci(k) container_of(k, struct mem_ctl_info, dev)

static ssize_t inject_enable_write(struct file *file, const char __user *data,

		size_t count, loff_t *ppos)

{

	struct device *dev = file->private_data;

	struct mem_ctl_info *mci = to_mci(dev);



	i5100_do_inject(mci);



	return count;

}



static int inject_enable_open(struct inode *inode, struct file *file)

{

	file->private_data = inode->i_private;

	return 0;

}



static const struct file_operations i5100_inject_enable_fops = {

	.open = inject_enable_open,

	.write = inject_enable_write,

	.llseek = generic_file_llseek,

};



static int i5100_setup_debugfs(struct mem_ctl_info *mci)

{

	struct i5100_priv *priv = mci->pvt_info;



	if (!i5100_debugfs)

		return -ENODEV;



	priv->debugfs = debugfs_create_dir(mci->bus.name, i5100_debugfs);



	if (!priv->debugfs)

		return -ENOMEM;



	debugfs_create_x8("inject_channel", S_IRUGO | S_IWUSR, priv->debugfs,

			&priv->inject_channel);

	debugfs_create_x8("inject_hlinesel", S_IRUGO | S_IWUSR, priv->debugfs,

			&priv->inject_hlinesel);

	debugfs_create_x8("inject_deviceptr1", S_IRUGO | S_IWUSR, priv->debugfs,

			&priv->inject_deviceptr1);

	debugfs_create_x8("inject_deviceptr2", S_IRUGO | S_IWUSR, priv->debugfs,

			&priv->inject_deviceptr2);

	debugfs_create_x16("inject_eccmask1", S_IRUGO | S_IWUSR, priv->debugfs,

			&priv->inject_eccmask1);

	debugfs_create_x16("inject_eccmask2", S_IRUGO | S_IWUSR, priv->debugfs,

			&priv->inject_eccmask2);

	debugfs_create_file("inject_enable", S_IWUSR, priv->debugfs,

			&mci->dev, &i5100_inject_enable_fops);



	return 0;



}



static int i5100_init_one(struct pci_dev *pdev, const struct pci_device_id *id)

{

	int rc;
@@ -1097,6 +1157,8 @@ static int i5100_init_one(struct pci_dev *pdev, const struct pci_device_id *id) 
		goto bail_scrub;

	}



	i5100_setup_debugfs(mci);



	return ret;



bail_scrub:
@@ -1141,6 +1203,9 @@ static void i5100_remove_one(struct pci_dev *pdev) 


	priv = mci->pvt_info;



	if (priv->debugfs)

		debugfs_remove_recursive(priv->debugfs);



	priv->scrub_enable = 0;

	cancel_delayed_work_sync(&(priv->i5100_scrubbing));
@@ -1173,13 +1238,17 @@ static int __init i5100_init(void) 
{

	int pci_rc;



	pci_rc = pci_register_driver(&i5100_driver);

	i5100_debugfs = debugfs_create_dir("i5100_edac", NULL);



	pci_rc = pci_register_driver(&i5100_driver);

	return (pci_rc < 0) ? pci_rc : 0;

}



static void __exit i5100_exit(void)

{

	if (i5100_debugfs)

		debugfs_remove(i5100_debugfs);



	pci_unregister_driver(&i5100_driver);

}

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