// SPDX-License-Identifier: GPL-2.0-only

#include <linux/string_choices.h>

#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",
                str_plural(errcount),
                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,
};

void __init edac_debugfs_init(void)
{
        edac_debugfs = debugfs_create_dir("edac", NULL);
}

void edac_debugfs_exit(void)
{
        debugfs_remove_recursive(edac_debugfs);
}

void edac_create_debugfs_nodes(struct mem_ctl_info *mci)
{
        struct dentry *parent;
        char name[80];
        int i;

        parent = debugfs_create_dir(mci->dev.kobj.name, edac_debugfs);

        for (i = 0; i < mci->n_layers; i++) {
                sprintf(name, "fake_inject_%s",
                             edac_layer_name[mci->layers[i].type]);
                debugfs_create_u8(name, S_IRUGO | S_IWUSR, parent,
                                  &mci->fake_inject_layer[i]);
        }

        debugfs_create_bool("fake_inject_ue", S_IRUGO | S_IWUSR, parent,
                            &mci->fake_inject_ue);

        debugfs_create_u16("fake_inject_count", S_IRUGO | S_IWUSR, parent,
                           &mci->fake_inject_count);

        debugfs_create_file("fake_inject", S_IWUSR, parent, &mci->dev,
                            &debug_fake_inject_fops);

        mci->debugfs = parent;
}

/* Create a toplevel dir under EDAC's debugfs hierarchy */
struct dentry *edac_debugfs_create_dir(const char *dirname)
{
        if (!edac_debugfs)
                return NULL;

        return debugfs_create_dir(dirname, edac_debugfs);
}
EXPORT_SYMBOL_GPL(edac_debugfs_create_dir);

/* Create a toplevel dir under EDAC's debugfs hierarchy with parent @parent */
struct dentry *
edac_debugfs_create_dir_at(const char *dirname, struct dentry *parent)
{
        return debugfs_create_dir(dirname, parent);
}
EXPORT_SYMBOL_GPL(edac_debugfs_create_dir_at);

/*
 * Create a file under EDAC's hierarchy or a sub-hierarchy:
 *
 * @name: file name
 * @mode: file permissions
 * @parent: parent dentry. If NULL, it becomes the toplevel EDAC dir
 * @data: private data of caller
 * @fops: file operations of this file
 */
struct dentry *
edac_debugfs_create_file(const char *name, umode_t mode, struct dentry *parent,
                         void *data, const struct file_operations *fops)
{
        if (!parent)
                parent = edac_debugfs;

        return debugfs_create_file(name, mode, parent, data, fops);
}
EXPORT_SYMBOL_GPL(edac_debugfs_create_file);

/* Wrapper for debugfs_create_x8() */
void edac_debugfs_create_x8(const char *name, umode_t mode,
                            struct dentry *parent, u8 *value)
{
        if (!parent)
                parent = edac_debugfs;

        debugfs_create_x8(name, mode, parent, value);
}
EXPORT_SYMBOL_GPL(edac_debugfs_create_x8);

/* Wrapper for debugfs_create_x16() */
void edac_debugfs_create_x16(const char *name, umode_t mode,
                             struct dentry *parent, u16 *value)
{
        if (!parent)
                parent = edac_debugfs;

        debugfs_create_x16(name, mode, parent, value);
}
EXPORT_SYMBOL_GPL(edac_debugfs_create_x16);

/* Wrapper for debugfs_create_x32() */
void edac_debugfs_create_x32(const char *name, umode_t mode,
                             struct dentry *parent, u32 *value)
{
        if (!parent)
                parent = edac_debugfs;

        debugfs_create_x32(name, mode, parent, value);
}
EXPORT_SYMBOL_GPL(edac_debugfs_create_x32);