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authorMauro Carvalho Chehab <mchehab@redhat.com>2012-03-26 09:35:11 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2012-06-11 13:23:43 -0300
commit452a6bf955ee1842361742833e40e046287308f4 (patch)
tree2e4fb61fbbf32f17d80d9fce27a985361e6fc9af /drivers/edac
parent8ad6c78a69ac5c74e8f4e8c78cdb86772face433 (diff)
downloadlinux-linaro-stable-452a6bf955ee1842361742833e40e046287308f4.tar.gz
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>
Diffstat (limited to 'drivers/edac')
-rw-r--r--drivers/edac/edac_mc_sysfs.c87
1 files changed, 87 insertions, 0 deletions
diff --git a/drivers/edac/edac_mc_sysfs.c b/drivers/edac/edac_mc_sysfs.c
index 87fb396bc550..daa418b61525 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"
@@ -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