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edac: Add debufs nodes to allow doing fake error inject 

Sometimes, it is useful to have a mechanism that generates fake
errors, in order to test the EDAC core code, and the userspace
tools.

Provide such mechanism by adding a few debugfs nodes.

Reviewed-by: Aristeu Rozanski <arozansk@redhat.com>
Cc: Doug Thompson <norsk5@yahoo.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
hifive-unleashed-5.1
Mauro Carvalho Chehab 2012-03-26 09:35:11 -03:00
parent 8ad6c78a69
commit 452a6bf955
2 changed files with 94 additions and 0 deletions
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87
drivers/edac/edac_mc_sysfs.c
View File

@ -17,6 +17,7 @@
#include <linux/edac.h>
#include <linux/bug.h>
#include <linux/pm_runtime.h>
#include <linux/uaccess.h>
#include "edac_core.h"
#include "edac_module.h"
@ -783,6 +784,47 @@ static ssize_t mci_max_location_show(struct device *dev,
return p - data;
}
#ifdef CONFIG_EDAC_DEBUG
static ssize_t edac_fake_inject_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);
static enum hw_event_mc_err_type type;
type = mci->fake_inject_ue ? HW_EVENT_ERR_UNCORRECTED
: HW_EVENT_ERR_CORRECTED;
printk(KERN_DEBUG
"Generating a %s fake error to %d.%d.%d to test core handling. NOTE: this won't test the driver-specific decoding logic.\n",
(type == HW_EVENT_ERR_UNCORRECTED) ? "UE" : "CE",
mci->fake_inject_layer[0],
mci->fake_inject_layer[1],
mci->fake_inject_layer[2]
);
edac_mc_handle_error(type, mci, 0, 0, 0,
mci->fake_inject_layer[0],
mci->fake_inject_layer[1],
mci->fake_inject_layer[2],
"FAKE ERROR", "for EDAC testing only", NULL);
return count;
}
static int debugfs_open(struct inode *inode, struct file *file)
{
file->private_data = inode->i_private;
return 0;
}
static const struct file_operations debug_fake_inject_fops = {
.open = debugfs_open,
.write = edac_fake_inject_write,
.llseek = generic_file_llseek,
};
#endif
/* default Control file */
DEVICE_ATTR(reset_counters, S_IWUSR, NULL, mci_reset_counters_store);
@ -833,6 +875,45 @@ static struct device_type mci_attr_type = {
.release = mci_attr_release,
};
#ifdef CONFIG_EDAC_DEBUG
int edac_create_debug_nodes(struct mem_ctl_info *mci)
{
struct dentry *d, *parent;
char name[80];
int i;
d = debugfs_create_dir(mci->dev.kobj.name, mci->debugfs);
if (!d)
return -ENOMEM;
parent = d;
for (i = 0; i < mci->n_layers; i++) {
sprintf(name, "fake_inject_%s",
edac_layer_name[mci->layers[i].type]);
d = debugfs_create_u8(name, S_IRUGO | S_IWUSR, parent,
&mci->fake_inject_layer[i]);
if (!d)
goto nomem;
}
d = debugfs_create_bool("fake_inject_ue", S_IRUGO | S_IWUSR, parent,
&mci->fake_inject_ue);
if (!d)
goto nomem;
d = debugfs_create_file("fake_inject", S_IWUSR, parent,
&mci->dev,
&debug_fake_inject_fops);
if (!d)
goto nomem;
return 0;
nomem:
debugfs_remove(mci->debugfs);
return -ENOMEM;
}
#endif
/*
* Create a new Memory Controller kobject instance,
* mc<id> under the 'mc' directory
@ -911,6 +992,9 @@ int edac_create_sysfs_mci_device(struct mem_ctl_info *mci)
goto fail;
#endif
#ifdef CONFIG_EDAC_DEBUG
edac_create_debug_nodes(mci);
#endif
return 0;
fail:
@ -937,6 +1021,9 @@ void edac_remove_sysfs_mci_device(struct mem_ctl_info *mci)
debugf0("%s()\n", __func__);
#ifdef CONFIG_EDAC_DEBUG
debugfs_remove(mci->debugfs);
#endif
#ifdef CONFIG_EDAC_LEGACY_SYSFS
edac_delete_csrow_objects(mci);
#endif

7
include/linux/edac.h
View File

@ -17,6 +17,7 @@
#include <linux/kobject.h>
#include <linux/completion.h>
#include <linux/workqueue.h>
#include <linux/debugfs.h>
struct device;
@ -634,6 +635,12 @@ struct mem_ctl_info {
/* the internal state of this controller instance */
int op_state;
#ifdef CONFIG_EDAC_DEBUG
struct dentry *debugfs;
u8 fake_inject_layer[EDAC_MAX_LAYERS];
u32 fake_inject_ue;
#endif
};
#endif