// SPDX-License-Identifier: GPL-2.0
/* Copyright(c) 1999 - 2018 Intel Corporation. */

#include <linux/debugfs.h>
#include <linux/module.h>

#include "ixgbe.h"

static struct dentry *ixgbe_dbg_root;

static char ixgbe_dbg_reg_ops_buf[256] = "";

static ssize_t ixgbe_dbg_common_ops_read(struct file *filp, char __user *buffer,
                                         size_t count, loff_t *ppos,
                                         char *dbg_buf)
{
        struct ixgbe_adapter *adapter = filp->private_data;
        char *buf;
        int len;

        /* don't allow partial reads */
        if (*ppos != 0)
                return 0;

        buf = kasprintf(GFP_KERNEL, "%s: %s\n",
                        adapter->netdev->name, dbg_buf);
        if (!buf)
                return -ENOMEM;

        if (count < strlen(buf)) {
                kfree(buf);
                return -ENOSPC;
        }

        len = simple_read_from_buffer(buffer, count, ppos, buf, strlen(buf));

        kfree(buf);
        return len;
}

/**
 * ixgbe_dbg_reg_ops_read - read for reg_ops datum
 * @filp: the opened file
 * @buffer: where to write the data for the user to read
 * @count: the size of the user's buffer
 * @ppos: file position offset
 **/
static ssize_t ixgbe_dbg_reg_ops_read(struct file *filp, char __user *buffer,
                                      size_t count, loff_t *ppos)
{
        return ixgbe_dbg_common_ops_read(filp, buffer, count, ppos,
                                         ixgbe_dbg_reg_ops_buf);
}

/**
 * ixgbe_dbg_reg_ops_write - write into reg_ops datum
 * @filp: the opened file
 * @buffer: where to find the user's data
 * @count: the length of the user's data
 * @ppos: file position offset
 **/
static ssize_t ixgbe_dbg_reg_ops_write(struct file *filp,
                                     const char __user *buffer,
                                     size_t count, loff_t *ppos)
{
        struct ixgbe_adapter *adapter = filp->private_data;
        int len;

        /* don't allow partial writes */
        if (*ppos != 0)
                return 0;
        if (count >= sizeof(ixgbe_dbg_reg_ops_buf))
                return -ENOSPC;

        len = simple_write_to_buffer(ixgbe_dbg_reg_ops_buf,
                                     sizeof(ixgbe_dbg_reg_ops_buf)-1,
                                     ppos,
                                     buffer,
                                     count);
        if (len < 0)
                return len;

        ixgbe_dbg_reg_ops_buf[len] = '\0';

        if (strncmp(ixgbe_dbg_reg_ops_buf, "write", 5) == 0) {
                u32 reg, value;
                int cnt;
                cnt = sscanf(&ixgbe_dbg_reg_ops_buf[5], "%x %x", &reg, &value);
                if (cnt == 2) {
                        IXGBE_WRITE_REG(&adapter->hw, reg, value);
                        value = IXGBE_READ_REG(&adapter->hw, reg);
                        e_dev_info("write: 0x%08x = 0x%08x\n", reg, value);
                } else {
                        e_dev_info("write <reg> <value>\n");
                }
        } else if (strncmp(ixgbe_dbg_reg_ops_buf, "read", 4) == 0) {
                u32 reg, value;
                int cnt;
                cnt = sscanf(&ixgbe_dbg_reg_ops_buf[4], "%x", &reg);
                if (cnt == 1) {
                        value = IXGBE_READ_REG(&adapter->hw, reg);
                        e_dev_info("read 0x%08x = 0x%08x\n", reg, value);
                } else {
                        e_dev_info("read <reg>\n");
                }
        } else {
                e_dev_info("Unknown command %s\n", ixgbe_dbg_reg_ops_buf);
                e_dev_info("Available commands:\n");
                e_dev_info("   read <reg>\n");
                e_dev_info("   write <reg> <value>\n");
        }
        return count;
}

static const struct file_operations ixgbe_dbg_reg_ops_fops = {
        .owner = THIS_MODULE,
        .open = simple_open,
        .read =  ixgbe_dbg_reg_ops_read,
        .write = ixgbe_dbg_reg_ops_write,
};

static char ixgbe_dbg_netdev_ops_buf[256] = "";

/**
 * ixgbe_dbg_netdev_ops_read - read for netdev_ops datum
 * @filp: the opened file
 * @buffer: where to write the data for the user to read
 * @count: the size of the user's buffer
 * @ppos: file position offset
 **/
static ssize_t ixgbe_dbg_netdev_ops_read(struct file *filp, char __user *buffer,
                                         size_t count, loff_t *ppos)
{
        return ixgbe_dbg_common_ops_read(filp, buffer, count, ppos,
                                         ixgbe_dbg_netdev_ops_buf);
}

/**
 * ixgbe_dbg_netdev_ops_write - write into netdev_ops datum
 * @filp: the opened file
 * @buffer: where to find the user's data
 * @count: the length of the user's data
 * @ppos: file position offset
 **/
static ssize_t ixgbe_dbg_netdev_ops_write(struct file *filp,
                                          const char __user *buffer,
                                          size_t count, loff_t *ppos)
{
        struct ixgbe_adapter *adapter = filp->private_data;
        int len;

        /* don't allow partial writes */
        if (*ppos != 0)
                return 0;
        if (count >= sizeof(ixgbe_dbg_netdev_ops_buf))
                return -ENOSPC;

        len = simple_write_to_buffer(ixgbe_dbg_netdev_ops_buf,
                                     sizeof(ixgbe_dbg_netdev_ops_buf)-1,
                                     ppos,
                                     buffer,
                                     count);
        if (len < 0)
                return len;

        ixgbe_dbg_netdev_ops_buf[len] = '\0';

        if (strncmp(ixgbe_dbg_netdev_ops_buf, "tx_timeout", 10) == 0) {
                adapter->netdev->netdev_ops->ndo_tx_timeout(adapter->netdev);
                e_dev_info("tx_timeout called\n");
        } else {
                e_dev_info("Unknown command: %s\n", ixgbe_dbg_netdev_ops_buf);
                e_dev_info("Available commands:\n");
                e_dev_info("    tx_timeout\n");
        }
        return count;
}

static const struct file_operations ixgbe_dbg_netdev_ops_fops = {
        .owner = THIS_MODULE,
        .open = simple_open,
        .read = ixgbe_dbg_netdev_ops_read,
        .write = ixgbe_dbg_netdev_ops_write,
};

/**
 * ixgbe_dbg_adapter_init - setup the debugfs directory for the adapter
 * @adapter: the adapter that is starting up
 **/
void ixgbe_dbg_adapter_init(struct ixgbe_adapter *adapter)
{
        const char *name = pci_name(adapter->pdev);
        struct dentry *pfile;
        adapter->ixgbe_dbg_adapter = debugfs_create_dir(name, ixgbe_dbg_root);
        if (adapter->ixgbe_dbg_adapter) {
                pfile = debugfs_create_file("reg_ops", 0600,
                                            adapter->ixgbe_dbg_adapter, adapter,
                                            &ixgbe_dbg_reg_ops_fops);
                if (!pfile)
                        e_dev_err("debugfs reg_ops for %s failed\n", name);
                pfile = debugfs_create_file("netdev_ops", 0600,
                                            adapter->ixgbe_dbg_adapter, adapter,
                                            &ixgbe_dbg_netdev_ops_fops);
                if (!pfile)
                        e_dev_err("debugfs netdev_ops for %s failed\n", name);
        } else {
                e_dev_err("debugfs entry for %s failed\n", name);
        }
}

/**
 * ixgbe_dbg_adapter_exit - clear out the adapter's debugfs entries
 * @adapter: the adapter that is exiting
 **/
void ixgbe_dbg_adapter_exit(struct ixgbe_adapter *adapter)
{
        debugfs_remove_recursive(adapter->ixgbe_dbg_adapter);
        adapter->ixgbe_dbg_adapter = NULL;
}

/**
 * ixgbe_dbg_init - start up debugfs for the driver
 **/
void ixgbe_dbg_init(void)
{
        ixgbe_dbg_root = debugfs_create_dir(ixgbe_driver_name, NULL);
        if (ixgbe_dbg_root == NULL)
                pr_err("init of debugfs failed\n");
}

/**
 * ixgbe_dbg_exit - clean out the driver's debugfs entries
 **/
void ixgbe_dbg_exit(void)
{
        debugfs_remove_recursive(ixgbe_dbg_root);
}