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1// SPDX-License-Identifier: GPL-2.02/*3 * Debugfs interface Support for MPT (Message Passing Technology) based4 * controllers.5 *6 * Copyright (C) 2020 Broadcom Inc.7 *8 * Authors: Broadcom Inc.9 * Sreekanth Reddy <sreekanth.reddy@broadcom.com>10 * Suganath Prabu <suganath-prabu.subramani@broadcom.com>11 *12 * Send feedback to : MPT-FusionLinux.pdl@broadcom.com)13 *14 **/15 16#include <linux/kernel.h>17#include <linux/types.h>18#include <linux/pci.h>19#include <linux/interrupt.h>20#include <linux/compat.h>21#include <linux/uio.h>22 23#include <scsi/scsi.h>24#include <scsi/scsi_device.h>25#include <scsi/scsi_host.h>26#include "mpt3sas_base.h"27#include <linux/debugfs.h>28 29static struct dentry *mpt3sas_debugfs_root;30 31/*32 * _debugfs_iocdump_read - copy ioc dump from debugfs buffer33 * @filep: File Pointer34 * @ubuf: Buffer to fill data35 * @cnt: Length of the buffer36 * @ppos: Offset in the file37 */38 39static ssize_t40_debugfs_iocdump_read(struct file *filp, char __user *ubuf, size_t cnt,41 loff_t *ppos)42 43{44 struct mpt3sas_debugfs_buffer *debug = filp->private_data;45 46 if (!debug || !debug->buf)47 return 0;48 49 return simple_read_from_buffer(ubuf, cnt, ppos, debug->buf, debug->len);50}51 52/*53 * _debugfs_iocdump_open : open the ioc_dump debugfs attribute file54 */55static int56_debugfs_iocdump_open(struct inode *inode, struct file *file)57{58 struct MPT3SAS_ADAPTER *ioc = inode->i_private;59 struct mpt3sas_debugfs_buffer *debug;60 61 debug = kzalloc(sizeof(struct mpt3sas_debugfs_buffer), GFP_KERNEL);62 if (!debug)63 return -ENOMEM;64 65 debug->buf = (void *)ioc;66 debug->len = sizeof(struct MPT3SAS_ADAPTER);67 file->private_data = debug;68 return 0;69}70 71/*72 * _debugfs_iocdump_release : release the ioc_dump debugfs attribute73 * @inode: inode structure to the corresponds device74 * @file: File pointer75 */76static int77_debugfs_iocdump_release(struct inode *inode, struct file *file)78{79 struct mpt3sas_debugfs_buffer *debug = file->private_data;80 81 if (!debug)82 return 0;83 84 file->private_data = NULL;85 kfree(debug);86 return 0;87}88 89static const struct file_operations mpt3sas_debugfs_iocdump_fops = {90 .owner = THIS_MODULE,91 .open = _debugfs_iocdump_open,92 .read = _debugfs_iocdump_read,93 .release = _debugfs_iocdump_release,94};95 96/*97 * mpt3sas_init_debugfs : Create debugfs root for mpt3sas driver98 */99void mpt3sas_init_debugfs(void)100{101 mpt3sas_debugfs_root = debugfs_create_dir("mpt3sas", NULL);102 if (!mpt3sas_debugfs_root)103 pr_info("mpt3sas: Cannot create debugfs root\n");104}105 106/*107 * mpt3sas_exit_debugfs : Remove debugfs root for mpt3sas driver108 */109void mpt3sas_exit_debugfs(void)110{111 debugfs_remove_recursive(mpt3sas_debugfs_root);112}113 114/*115 * mpt3sas_setup_debugfs : Setup debugfs per HBA adapter116 * ioc: MPT3SAS_ADAPTER object117 */118void119mpt3sas_setup_debugfs(struct MPT3SAS_ADAPTER *ioc)120{121 char name[64];122 123 snprintf(name, sizeof(name), "scsi_host%d", ioc->shost->host_no);124 if (!ioc->debugfs_root) {125 ioc->debugfs_root =126 debugfs_create_dir(name, mpt3sas_debugfs_root);127 if (!ioc->debugfs_root) {128 dev_err(&ioc->pdev->dev,129 "Cannot create per adapter debugfs directory\n");130 return;131 }132 }133 134 snprintf(name, sizeof(name), "ioc_dump");135 ioc->ioc_dump = debugfs_create_file(name, 0444,136 ioc->debugfs_root, ioc, &mpt3sas_debugfs_iocdump_fops);137 if (!ioc->ioc_dump) {138 dev_err(&ioc->pdev->dev,139 "Cannot create ioc_dump debugfs file\n");140 debugfs_remove(ioc->debugfs_root);141 return;142 }143 144 snprintf(name, sizeof(name), "host_recovery");145 debugfs_create_u8(name, 0444, ioc->debugfs_root, &ioc->shost_recovery);146 147}148 149/*150 * mpt3sas_destroy_debugfs : Destroy debugfs per HBA adapter151 * @ioc: MPT3SAS_ADAPTER object152 */153void mpt3sas_destroy_debugfs(struct MPT3SAS_ADAPTER *ioc)154{155 debugfs_remove_recursive(ioc->debugfs_root);156}157 158