EDAC: Carve out debugfs functionality

... into a separate compilation unit and drop a couple of
CONFIG_EDAC_DEBUG ifdefferies. Rename edac_create_debug_nodes() to
edac_create_debugfs_nodes(), while at it.

No functionality change.

Cc: <linux-edac@vger.kernel.org>
Signed-off-by: Borislav Petkov <bp@suse.de>

1 files changed, 103 insertions, 0 deletions

diff --git a/drivers/edac/debugfs.c b/drivers/edac/debugfs.c
new file mode 100644
index 000000000000..bcd558d5cb48
--- /dev/null
+++ b/drivers/edac/debugfs.c
@@ -0,0 +1,103 @@
+#include "edac_module.h"
+
+static struct dentry *edac_debugfs;
+
+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;
+        u16 errcount = mci->fake_inject_count;
+
+        if (!errcount)
+                errcount = 1;
+
+        type = mci->fake_inject_ue ? HW_EVENT_ERR_UNCORRECTED
+                                   : HW_EVENT_ERR_CORRECTED;
+
+        printk(KERN_DEBUG
+               "Generating %d %s fake error%s to %d.%d.%d to test core handling. NOTE: this won't test the driver-specific decoding logic.\n",
+                errcount,
+                (type == HW_EVENT_ERR_UNCORRECTED) ? "UE" : "CE",
+                errcount > 1 ? "s" : "",
+                mci->fake_inject_layer[0],
+                mci->fake_inject_layer[1],
+                mci->fake_inject_layer[2]
+               );
+        edac_mc_handle_error(type, mci, errcount, 0, 0, 0,
+                             mci->fake_inject_layer[0],
+                             mci->fake_inject_layer[1],
+                             mci->fake_inject_layer[2],
+                             "FAKE ERROR", "for EDAC testing only");
+
+        return count;
+}
+
+static const struct file_operations debug_fake_inject_fops = {
+        .open = simple_open,
+        .write = edac_fake_inject_write,
+        .llseek = generic_file_llseek,
+};
+
+int __init edac_debugfs_init(void)
+{
+        edac_debugfs = debugfs_create_dir("edac", NULL);
+        if (IS_ERR(edac_debugfs)) {
+                edac_debugfs = NULL;
+                return -ENOMEM;
+        }
+        return 0;
+}
+
+void edac_debugfs_exit(void)
+{
+        debugfs_remove(edac_debugfs);
+}
+
+int edac_create_debugfs_nodes(struct mem_ctl_info *mci)
+{
+        struct dentry *d, *parent;
+        char name[80];
+        int i;
+
+        if (!edac_debugfs)
+                return -ENODEV;
+
+        d = debugfs_create_dir(mci->dev.kobj.name, edac_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_u16("fake_inject_count", S_IRUGO | S_IWUSR, parent,
+                                &mci->fake_inject_count);
+        if (!d)
+                goto nomem;
+
+        d = debugfs_create_file("fake_inject", S_IWUSR, parent,
+                                &mci->dev,
+                                &debug_fake_inject_fops);
+        if (!d)
+                goto nomem;
+
+        mci->debugfs = parent;
+        return 0;
+nomem:
+        debugfs_remove(mci->debugfs);
+        return -ENOMEM;
+}