1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Debugfs interface Support for MPT (Message Passing Technology) based
  4 * 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 buffer
 33 * @filep:	File Pointer
 34 * @ubuf:	Buffer to fill data
 35 * @cnt:	Length of the buffer
 36 * @ppos:	Offset in the file
 37 */
 38
 39static ssize_t
 40_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 file
 54 */
 55static int
 56_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 attribute
 73 * @inode: inode structure to the corresponds device
 74 * @file: File pointer
 75 */
 76static int
 77_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 driver
 98 */
 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 driver
108 */
109void mpt3sas_exit_debugfs(void)
110{
111	debugfs_remove_recursive(mpt3sas_debugfs_root);
112}
113
114/*
115 * mpt3sas_setup_debugfs :	Setup debugfs per HBA adapter
116 * ioc:				MPT3SAS_ADAPTER object
117 */
118void
119mpt3sas_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 adapter
151 * @ioc:	MPT3SAS_ADAPTER object
152 */
153void mpt3sas_destroy_debugfs(struct MPT3SAS_ADAPTER *ioc)
154{
155	debugfs_remove_recursive(ioc->debugfs_root);
156}
157