lkml.org 
[lkml]   [2012]   [Mar]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 08/14] edac: Add debufs nodes to allow doing fake error inject
Date
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.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
---
drivers/edac/edac_mc_sysfs.c | 87 ++++++++++++++++++++++++++++++++++++++++++
include/linux/edac.h | 7 +++
2 files changed, 94 insertions(+), 0 deletions(-)
diff --git a/drivers/edac/edac_mc_sysfs.c b/drivers/edac/edac_mc_sysfs.c
index bdd81b4..4ab2e19 100644
--- a/drivers/edac/edac_mc_sysfs.c
+++ b/drivers/edac/edac_mc_sysfs.c
@@ -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"
@@ -786,6 +787,47 @@ 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);

@@ -836,6 +878,45 @@ 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
@@ -901,6 +982,9 @@ 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:
@@ -925,6 +1009,9 @@ 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
diff --git a/include/linux/edac.h b/include/linux/edac.h
index 81ca2ba..3bfdcb9 100644
--- a/include/linux/edac.h
+++ b/include/linux/edac.h
@@ -14,6 +14,7 @@

#include <linux/atomic.h>
#include <linux/device.h>
+#include <linux/debugfs.h>

#define EDAC_OPSTATE_INVAL -1
#define EDAC_OPSTATE_POLL 0
@@ -608,6 +609,12 @@ 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
--
1.7.8


\
 
 \ /
  Last update: 2012-03-29 19:11    [from the cache]
©2003-2011 Jasper Spaans