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1/*2 * Linux MegaRAID driver for SAS based RAID controllers3 *4 * Copyright (c) 2003-2018 LSI Corporation.5 * Copyright (c) 2003-2018 Avago Technologies.6 * Copyright (c) 2003-2018 Broadcom Inc.7 *8 * This program is free software; you can redistribute it and/or9 * modify it under the terms of the GNU General Public License10 * as published by the Free Software Foundation; either version 211 * of the License, or (at your option) any later version.12 *13 * This program is distributed in the hope that it will be useful,14 * but WITHOUT ANY WARRANTY; without even the implied warranty of15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the16 * GNU General Public License for more details.17 *18 * You should have received a copy of the GNU General Public License19 * along with this program. If not, see <http://www.gnu.org/licenses/>.20 *21 * Authors: Broadcom Inc.22 * Kashyap Desai <kashyap.desai@broadcom.com>23 * Sumit Saxena <sumit.saxena@broadcom.com>24 * Shivasharan S <shivasharan.srikanteshwara@broadcom.com>25 *26 * Send feedback to: megaraidlinux.pdl@broadcom.com27 */28#include <linux/kernel.h>29#include <linux/types.h>30#include <linux/pci.h>31#include <linux/interrupt.h>32#include <linux/compat.h>33#include <linux/irq_poll.h>34 35#include <scsi/scsi.h>36#include <scsi/scsi_device.h>37#include <scsi/scsi_host.h>38 39#include "megaraid_sas_fusion.h"40#include "megaraid_sas.h"41 42#ifdef CONFIG_DEBUG_FS43#include <linux/debugfs.h>44 45struct dentry *megasas_debugfs_root;46 47static ssize_t48megasas_debugfs_read(struct file *filp, char __user *ubuf, size_t cnt,49 loff_t *ppos)50{51 struct megasas_debugfs_buffer *debug = filp->private_data;52 53 if (!debug || !debug->buf)54 return 0;55 56 return simple_read_from_buffer(ubuf, cnt, ppos, debug->buf, debug->len);57}58 59static int60megasas_debugfs_raidmap_open(struct inode *inode, struct file *file)61{62 struct megasas_instance *instance = inode->i_private;63 struct megasas_debugfs_buffer *debug;64 struct fusion_context *fusion;65 66 fusion = instance->ctrl_context;67 68 debug = kzalloc(sizeof(struct megasas_debugfs_buffer), GFP_KERNEL);69 if (!debug)70 return -ENOMEM;71 72 debug->buf = (void *)fusion->ld_drv_map[(instance->map_id & 1)];73 debug->len = fusion->drv_map_sz;74 file->private_data = debug;75 76 return 0;77}78 79static int80megasas_debugfs_release(struct inode *inode, struct file *file)81{82 struct megasas_debug_buffer *debug = file->private_data;83 84 if (!debug)85 return 0;86 87 file->private_data = NULL;88 kfree(debug);89 return 0;90}91 92static const struct file_operations megasas_debugfs_raidmap_fops = {93 .owner = THIS_MODULE,94 .open = megasas_debugfs_raidmap_open,95 .read = megasas_debugfs_read,96 .release = megasas_debugfs_release,97};98 99/*100 * megasas_init_debugfs : Create debugfs root for megaraid_sas driver101 */102void megasas_init_debugfs(void)103{104 megasas_debugfs_root = debugfs_create_dir("megaraid_sas", NULL);105 if (!megasas_debugfs_root)106 pr_info("Cannot create debugfs root\n");107}108 109/*110 * megasas_exit_debugfs : Remove debugfs root for megaraid_sas driver111 */112void megasas_exit_debugfs(void)113{114 debugfs_remove_recursive(megasas_debugfs_root);115}116 117/*118 * megasas_setup_debugfs : Setup debugfs per Fusion adapter119 * instance: Soft instance of adapter120 */121void122megasas_setup_debugfs(struct megasas_instance *instance)123{124 char name[64];125 struct fusion_context *fusion;126 127 fusion = instance->ctrl_context;128 129 if (fusion) {130 snprintf(name, sizeof(name),131 "scsi_host%d", instance->host->host_no);132 if (!instance->debugfs_root) {133 instance->debugfs_root =134 debugfs_create_dir(name, megasas_debugfs_root);135 if (!instance->debugfs_root) {136 dev_err(&instance->pdev->dev,137 "Cannot create per adapter debugfs directory\n");138 return;139 }140 }141 142 snprintf(name, sizeof(name), "raidmap_dump");143 instance->raidmap_dump =144 debugfs_create_file(name, S_IRUGO,145 instance->debugfs_root, instance,146 &megasas_debugfs_raidmap_fops);147 if (!instance->raidmap_dump) {148 dev_err(&instance->pdev->dev,149 "Cannot create raidmap debugfs file\n");150 debugfs_remove(instance->debugfs_root);151 return;152 }153 }154 155}156 157/*158 * megasas_destroy_debugfs : Destroy debugfs per Fusion adapter159 * instance: Soft instance of adapter160 */161void megasas_destroy_debugfs(struct megasas_instance *instance)162{163 debugfs_remove_recursive(instance->debugfs_root);164}165 166#else167void megasas_init_debugfs(void)168{169}170void megasas_exit_debugfs(void)171{172}173void megasas_setup_debugfs(struct megasas_instance *instance)174{175}176void megasas_destroy_debugfs(struct megasas_instance *instance)177{178}179#endif /*CONFIG_DEBUG_FS*/180