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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Hypervisor filesystem for Linux on s390 - debugfs interface
4 *
5 * Copyright IBM Corp. 2010
6 * Author(s): Michael Holzheu <holzheu@linux.vnet.ibm.com>
7 */
8
9#include <linux/slab.h>
10#include "hypfs.h"
11
12static struct dentry *dbfs_dir;
13
14static struct hypfs_dbfs_data *hypfs_dbfs_data_alloc(struct hypfs_dbfs_file *f)
15{
16 struct hypfs_dbfs_data *data;
17
18 data = kmalloc(sizeof(*data), GFP_KERNEL);
19 if (!data)
20 return NULL;
21 data->dbfs_file = f;
22 return data;
23}
24
25static void hypfs_dbfs_data_free(struct hypfs_dbfs_data *data)
26{
27 data->dbfs_file->data_free(data->buf_free_ptr);
28 kfree(data);
29}
30
31static ssize_t dbfs_read(struct file *file, char __user *buf,
32 size_t size, loff_t *ppos)
33{
34 struct hypfs_dbfs_data *data;
35 struct hypfs_dbfs_file *df;
36 ssize_t rc;
37
38 if (*ppos != 0)
39 return 0;
40
41 df = file_inode(file)->i_private;
42 mutex_lock(&df->lock);
43 data = hypfs_dbfs_data_alloc(df);
44 if (!data) {
45 mutex_unlock(&df->lock);
46 return -ENOMEM;
47 }
48 rc = df->data_create(&data->buf, &data->buf_free_ptr, &data->size);
49 if (rc) {
50 mutex_unlock(&df->lock);
51 kfree(data);
52 return rc;
53 }
54 mutex_unlock(&df->lock);
55
56 rc = simple_read_from_buffer(buf, size, ppos, data->buf, data->size);
57 hypfs_dbfs_data_free(data);
58 return rc;
59}
60
61static long dbfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
62{
63 struct hypfs_dbfs_file *df = file_inode(file)->i_private;
64 long rc;
65
66 mutex_lock(&df->lock);
67 if (df->unlocked_ioctl)
68 rc = df->unlocked_ioctl(file, cmd, arg);
69 else
70 rc = -ENOTTY;
71 mutex_unlock(&df->lock);
72 return rc;
73}
74
75static const struct file_operations dbfs_ops = {
76 .read = dbfs_read,
77 .llseek = no_llseek,
78 .unlocked_ioctl = dbfs_ioctl,
79};
80
81void hypfs_dbfs_create_file(struct hypfs_dbfs_file *df)
82{
83 df->dentry = debugfs_create_file(df->name, 0400, dbfs_dir, df,
84 &dbfs_ops);
85 mutex_init(&df->lock);
86}
87
88void hypfs_dbfs_remove_file(struct hypfs_dbfs_file *df)
89{
90 debugfs_remove(df->dentry);
91}
92
93static int __init hypfs_dbfs_init(void)
94{
95 int rc = -ENODATA;
96
97 dbfs_dir = debugfs_create_dir("s390_hypfs", NULL);
98 if (hypfs_diag_init())
99 goto fail_dbfs_exit;
100 if (hypfs_vm_init())
101 goto fail_hypfs_diag_exit;
102 hypfs_sprp_init();
103 if (hypfs_diag0c_init())
104 goto fail_hypfs_sprp_exit;
105 rc = hypfs_fs_init();
106 if (rc)
107 goto fail_hypfs_diag0c_exit;
108 return 0;
109
110fail_hypfs_diag0c_exit:
111 hypfs_diag0c_exit();
112fail_hypfs_sprp_exit:
113 hypfs_sprp_exit();
114 hypfs_vm_exit();
115fail_hypfs_diag_exit:
116 hypfs_diag_exit();
117 pr_err("Initialization of hypfs failed with rc=%i\n", rc);
118fail_dbfs_exit:
119 debugfs_remove(dbfs_dir);
120 return rc;
121}
122device_initcall(hypfs_dbfs_init)
1/*
2 * Hypervisor filesystem for Linux on s390 - debugfs interface
3 *
4 * Copyright IBM Corp. 2010
5 * Author(s): Michael Holzheu <holzheu@linux.vnet.ibm.com>
6 */
7
8#include <linux/slab.h>
9#include "hypfs.h"
10
11static struct dentry *dbfs_dir;
12
13static struct hypfs_dbfs_data *hypfs_dbfs_data_alloc(struct hypfs_dbfs_file *f)
14{
15 struct hypfs_dbfs_data *data;
16
17 data = kmalloc(sizeof(*data), GFP_KERNEL);
18 if (!data)
19 return NULL;
20 data->dbfs_file = f;
21 return data;
22}
23
24static void hypfs_dbfs_data_free(struct hypfs_dbfs_data *data)
25{
26 data->dbfs_file->data_free(data->buf_free_ptr);
27 kfree(data);
28}
29
30static ssize_t dbfs_read(struct file *file, char __user *buf,
31 size_t size, loff_t *ppos)
32{
33 struct hypfs_dbfs_data *data;
34 struct hypfs_dbfs_file *df;
35 ssize_t rc;
36
37 if (*ppos != 0)
38 return 0;
39
40 df = file_inode(file)->i_private;
41 mutex_lock(&df->lock);
42 data = hypfs_dbfs_data_alloc(df);
43 if (!data) {
44 mutex_unlock(&df->lock);
45 return -ENOMEM;
46 }
47 rc = df->data_create(&data->buf, &data->buf_free_ptr, &data->size);
48 if (rc) {
49 mutex_unlock(&df->lock);
50 kfree(data);
51 return rc;
52 }
53 mutex_unlock(&df->lock);
54
55 rc = simple_read_from_buffer(buf, size, ppos, data->buf, data->size);
56 hypfs_dbfs_data_free(data);
57 return rc;
58}
59
60static long dbfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
61{
62 struct hypfs_dbfs_file *df = file_inode(file)->i_private;
63 long rc;
64
65 mutex_lock(&df->lock);
66 if (df->unlocked_ioctl)
67 rc = df->unlocked_ioctl(file, cmd, arg);
68 else
69 rc = -ENOTTY;
70 mutex_unlock(&df->lock);
71 return rc;
72}
73
74static const struct file_operations dbfs_ops = {
75 .read = dbfs_read,
76 .llseek = no_llseek,
77 .unlocked_ioctl = dbfs_ioctl,
78};
79
80int hypfs_dbfs_create_file(struct hypfs_dbfs_file *df)
81{
82 df->dentry = debugfs_create_file(df->name, 0400, dbfs_dir, df,
83 &dbfs_ops);
84 if (IS_ERR(df->dentry))
85 return PTR_ERR(df->dentry);
86 mutex_init(&df->lock);
87 return 0;
88}
89
90void hypfs_dbfs_remove_file(struct hypfs_dbfs_file *df)
91{
92 debugfs_remove(df->dentry);
93}
94
95int hypfs_dbfs_init(void)
96{
97 dbfs_dir = debugfs_create_dir("s390_hypfs", NULL);
98 return PTR_ERR_OR_ZERO(dbfs_dir);
99}
100
101void hypfs_dbfs_exit(void)
102{
103 debugfs_remove(dbfs_dir);
104}