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authorNiklas Söderlund <niklas.soderlund@ericsson.com>2012-08-08 12:30:58 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2013-02-21 11:06:34 -0300
commit9cbc6d38f25ae8fb3efd0b1c14f4f18c1d9f0369 (patch)
tree64e47865660991de08be713eea8f1d1dc57da9c0 /drivers/edac/i5100_edac.c
parent53ceafd6a27f3e15dc83e8865f9f20029f6dfc66 (diff)
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: Niklas Söderlund <niklas.soderlund@ericsson.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/edac/i5100_edac.c')
-rw-r--r--drivers/edac/i5100_edac.c71
1 files changed, 70 insertions, 1 deletions
diff --git a/drivers/edac/i5100_edac.c b/drivers/edac/i5100_edac.c
index 0a0345bd743..ad4cc898dc6 100644
--- a/drivers/edac/i5100_edac.c
+++ b/drivers/edac/i5100_edac.c
@@ -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);
}