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i5100_edac: connect fault injection to debugfs node

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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: Niklas Söderlund <niklas.soderlund@ericsson.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Niklas Söderlund 2012-08-08 12:30:58 -03:00 committed by Mauro Carvalho Chehab
parent 53ceafd6a2
commit 9cbc6d38f2
1 changed files with 70 additions and 1 deletions
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71
drivers/edac/i5100_edac.c
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@ -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);
}