1 | /* |
2 | * Linux MegaRAID driver for SAS based RAID controllers |
3 | * |
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/or |
9 | * modify it under the terms of the GNU General Public License |
10 | * as published by the Free Software Foundation; either version 2 |
11 | * 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 of |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
16 | * GNU General Public License for more details. |
17 | * |
18 | * You should have received a copy of the GNU General Public License |
19 | * 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.com |
27 | */ |
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_FS |
43 | #include <linux/debugfs.h> |
44 | |
45 | struct dentry *megasas_debugfs_root; |
46 | |
47 | static ssize_t |
48 | megasas_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(to: ubuf, count: cnt, ppos, from: debug->buf, available: debug->len); |
57 | } |
58 | |
59 | static int |
60 | megasas_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(size: 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 | |
79 | static int |
80 | megasas_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(objp: debug); |
89 | return 0; |
90 | } |
91 | |
92 | static 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 driver |
101 | */ |
102 | void megasas_init_debugfs(void) |
103 | { |
104 | megasas_debugfs_root = debugfs_create_dir(name: "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 driver |
111 | */ |
112 | void megasas_exit_debugfs(void) |
113 | { |
114 | debugfs_remove_recursive(dentry: megasas_debugfs_root); |
115 | } |
116 | |
117 | /* |
118 | * megasas_setup_debugfs : Setup debugfs per Fusion adapter |
119 | * instance: Soft instance of adapter |
120 | */ |
121 | void |
122 | megasas_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(buf: name, size: sizeof(name), |
131 | fmt: "scsi_host%d" , instance->host->host_no); |
132 | if (!instance->debugfs_root) { |
133 | instance->debugfs_root = |
134 | debugfs_create_dir(name, parent: 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(buf: name, size: sizeof(name), fmt: "raidmap_dump" ); |
143 | instance->raidmap_dump = |
144 | debugfs_create_file(name, S_IRUGO, |
145 | parent: instance->debugfs_root, data: instance, |
146 | fops: &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(dentry: instance->debugfs_root); |
151 | return; |
152 | } |
153 | } |
154 | |
155 | } |
156 | |
157 | /* |
158 | * megasas_destroy_debugfs : Destroy debugfs per Fusion adapter |
159 | * instance: Soft instance of adapter |
160 | */ |
161 | void megasas_destroy_debugfs(struct megasas_instance *instance) |
162 | { |
163 | debugfs_remove_recursive(dentry: instance->debugfs_root); |
164 | } |
165 | |
166 | #else |
167 | void megasas_init_debugfs(void) |
168 | { |
169 | } |
170 | void megasas_exit_debugfs(void) |
171 | { |
172 | } |
173 | void megasas_setup_debugfs(struct megasas_instance *instance) |
174 | { |
175 | } |
176 | void megasas_destroy_debugfs(struct megasas_instance *instance) |
177 | { |
178 | } |
179 | #endif /*CONFIG_DEBUG_FS*/ |
180 | |