/*
 *  Linux MegaRAID driver for SAS based RAID controllers
 *
 *  Copyright (c) 2003-2018  LSI Corporation.
 *  Copyright (c) 2003-2018  Avago Technologies.
 *  Copyright (c) 2003-2018  Broadcom Inc.
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License
 *  as published by the Free Software Foundation; either version 2
 *  of the License, or (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 *  Authors: Broadcom Inc.
 *           Kashyap Desai <kashyap.desai@broadcom.com>
 *           Sumit Saxena <sumit.saxena@broadcom.com>
 *           Shivasharan S <shivasharan.srikanteshwara@broadcom.com>
 *
 *  Send feedback to: megaraidlinux.pdl@broadcom.com
 */
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/interrupt.h>
#include <linux/compat.h>
#include <linux/irq_poll.h>

#include <scsi/scsi.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>

#include "megaraid_sas_fusion.h"
#include "megaraid_sas.h"

#ifdef CONFIG_DEBUG_FS
#include <linux/debugfs.h>

struct dentry *megasas_debugfs_root;

static ssize_t
megasas_debugfs_read(struct file *filp, char __user *ubuf, size_t cnt,
                      loff_t *ppos)
{
        struct megasas_debugfs_buffer *debug = filp->private_data;

        if (!debug || !debug->buf)
                return 0;

        return simple_read_from_buffer(ubuf, cnt, ppos, debug->buf, debug->len);
}

static int
megasas_debugfs_raidmap_open(struct inode *inode, struct file *file)
{
        struct megasas_instance *instance = inode->i_private;
        struct megasas_debugfs_buffer *debug;
        struct fusion_context *fusion;

        fusion = instance->ctrl_context;

        debug = kzalloc_obj(struct megasas_debugfs_buffer);
        if (!debug)
                return -ENOMEM;

        debug->buf = (void *)fusion->ld_drv_map[(instance->map_id & 1)];
        debug->len = fusion->drv_map_sz;
        file->private_data = debug;

        return 0;
}

static int
megasas_debugfs_release(struct inode *inode, struct file *file)
{
        struct megasas_debug_buffer *debug = file->private_data;

        if (!debug)
                return 0;

        file->private_data = NULL;
        kfree(debug);
        return 0;
}

static const struct file_operations megasas_debugfs_raidmap_fops = {
        .owner          = THIS_MODULE,
        .open           = megasas_debugfs_raidmap_open,
        .read           = megasas_debugfs_read,
        .release        = megasas_debugfs_release,
};

/*
 * megasas_init_debugfs :       Create debugfs root for megaraid_sas driver
 */
void megasas_init_debugfs(void)
{
        megasas_debugfs_root = debugfs_create_dir("megaraid_sas", NULL);
        if (!megasas_debugfs_root)
                pr_info("Cannot create debugfs root\n");
}

/*
 * megasas_exit_debugfs :       Remove debugfs root for megaraid_sas driver
 */
void megasas_exit_debugfs(void)
{
        debugfs_remove_recursive(megasas_debugfs_root);
}

/*
 * megasas_setup_debugfs :      Setup debugfs per Fusion adapter
 * instance:                            Soft instance of adapter
 */
void
megasas_setup_debugfs(struct megasas_instance *instance)
{
        char name[64];
        struct fusion_context *fusion;

        fusion = instance->ctrl_context;

        if (fusion) {
                snprintf(name, sizeof(name),
                         "scsi_host%d", instance->host->host_no);
                if (!instance->debugfs_root) {
                        instance->debugfs_root =
                                debugfs_create_dir(name, megasas_debugfs_root);
                        if (!instance->debugfs_root) {
                                dev_err(&instance->pdev->dev,
                                        "Cannot create per adapter debugfs directory\n");
                                return;
                        }
                }

                snprintf(name, sizeof(name), "raidmap_dump");
                instance->raidmap_dump =
                        debugfs_create_file(name, S_IRUGO,
                                            instance->debugfs_root, instance,
                                            &megasas_debugfs_raidmap_fops);
                if (!instance->raidmap_dump) {
                        dev_err(&instance->pdev->dev,
                                "Cannot create raidmap debugfs file\n");
                        debugfs_remove(instance->debugfs_root);
                        return;
                }
        }

}

/*
 * megasas_destroy_debugfs :    Destroy debugfs per Fusion adapter
 * instance:                                    Soft instance of adapter
 */
void megasas_destroy_debugfs(struct megasas_instance *instance)
{
        debugfs_remove_recursive(instance->debugfs_root);
}

#else
void megasas_init_debugfs(void)
{
}
void megasas_exit_debugfs(void)
{
}
void megasas_setup_debugfs(struct megasas_instance *instance)
{
}
void megasas_destroy_debugfs(struct megasas_instance *instance)
{
}
#endif /*CONFIG_DEBUG_FS*/