]>
Commit | Line | Data |
---|---|---|
ab9953ff | 1 | // SPDX-License-Identifier: GPL-2.0+ |
1da177e4 LT |
2 | /* |
3 | * IUCV special message driver | |
4 | * | |
6a1d96dc MS |
5 | * Copyright IBM Corp. 2003, 2009 |
6 | * | |
1da177e4 | 7 | * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com) |
1da177e4 LT |
8 | */ |
9 | ||
10 | #include <linux/module.h> | |
11 | #include <linux/init.h> | |
12 | #include <linux/errno.h> | |
13 | #include <linux/device.h> | |
5a0e3ad6 | 14 | #include <linux/slab.h> |
5da5e658 | 15 | #include <net/iucv/iucv.h> |
1da177e4 LT |
16 | #include <asm/cpcmd.h> |
17 | #include <asm/ebcdic.h> | |
5da5e658 | 18 | #include "smsgiucv.h" |
1da177e4 LT |
19 | |
20 | struct smsg_callback { | |
21 | struct list_head list; | |
09003ed9 | 22 | const char *prefix; |
1da177e4 | 23 | int len; |
09003ed9 | 24 | void (*callback)(const char *from, char *str); |
1da177e4 LT |
25 | }; |
26 | ||
27 | MODULE_AUTHOR | |
28 | ("(C) 2003 IBM Corporation by Martin Schwidefsky (schwidefsky@de.ibm.com)"); | |
29 | MODULE_DESCRIPTION ("Linux for S/390 IUCV special message driver"); | |
30 | ||
5da5e658 | 31 | static struct iucv_path *smsg_path; |
6a1d96dc MS |
32 | /* dummy device used as trigger for PM functions */ |
33 | static struct device *smsg_dev; | |
5da5e658 | 34 | |
1da177e4 | 35 | static DEFINE_SPINLOCK(smsg_list_lock); |
c11ca97e | 36 | static LIST_HEAD(smsg_list); |
59b60e97 | 37 | static int iucv_path_connected; |
1da177e4 | 38 | |
91e60eb6 | 39 | static int smsg_path_pending(struct iucv_path *, u8 *, u8 *); |
5da5e658 MS |
40 | static void smsg_message_pending(struct iucv_path *, struct iucv_message *); |
41 | ||
42 | static struct iucv_handler smsg_handler = { | |
43 | .path_pending = smsg_path_pending, | |
44 | .message_pending = smsg_message_pending, | |
45 | }; | |
46 | ||
91e60eb6 | 47 | static int smsg_path_pending(struct iucv_path *path, u8 *ipvmid, u8 *ipuser) |
1da177e4 | 48 | { |
08b01832 | 49 | if (strncmp(ipvmid, "*MSG ", 8) != 0) |
5da5e658 MS |
50 | return -EINVAL; |
51 | /* Path pending from *MSG. */ | |
52 | return iucv_path_accept(path, &smsg_handler, "SMSGIUCV ", NULL); | |
1da177e4 LT |
53 | } |
54 | ||
5da5e658 MS |
55 | static void smsg_message_pending(struct iucv_path *path, |
56 | struct iucv_message *msg) | |
1da177e4 LT |
57 | { |
58 | struct smsg_callback *cb; | |
5da5e658 | 59 | unsigned char *buffer; |
15439d74 | 60 | unsigned char sender[9]; |
15439d74 | 61 | int rc, i; |
1da177e4 | 62 | |
5da5e658 MS |
63 | buffer = kmalloc(msg->length + 1, GFP_ATOMIC | GFP_DMA); |
64 | if (!buffer) { | |
65 | iucv_message_reject(path, msg); | |
1da177e4 LT |
66 | return; |
67 | } | |
5da5e658 | 68 | rc = iucv_message_receive(path, msg, 0, buffer, msg->length, NULL); |
1da177e4 | 69 | if (rc == 0) { |
5da5e658 MS |
70 | buffer[msg->length] = 0; |
71 | EBCASC(buffer, msg->length); | |
72 | memcpy(sender, buffer, 8); | |
15439d74 MS |
73 | sender[8] = 0; |
74 | /* Remove trailing whitespace from the sender name. */ | |
75 | for (i = 7; i >= 0; i--) { | |
76 | if (sender[i] != ' ' && sender[i] != '\t') | |
77 | break; | |
78 | sender[i] = 0; | |
79 | } | |
1da177e4 LT |
80 | spin_lock(&smsg_list_lock); |
81 | list_for_each_entry(cb, &smsg_list, list) | |
5da5e658 MS |
82 | if (strncmp(buffer + 8, cb->prefix, cb->len) == 0) { |
83 | cb->callback(sender, buffer + 8); | |
1da177e4 LT |
84 | break; |
85 | } | |
86 | spin_unlock(&smsg_list_lock); | |
87 | } | |
5da5e658 | 88 | kfree(buffer); |
1da177e4 LT |
89 | } |
90 | ||
09003ed9 HB |
91 | int smsg_register_callback(const char *prefix, |
92 | void (*callback)(const char *from, char *str)) | |
1da177e4 LT |
93 | { |
94 | struct smsg_callback *cb; | |
95 | ||
96 | cb = kmalloc(sizeof(struct smsg_callback), GFP_KERNEL); | |
97 | if (!cb) | |
98 | return -ENOMEM; | |
99 | cb->prefix = prefix; | |
100 | cb->len = strlen(prefix); | |
101 | cb->callback = callback; | |
5da5e658 | 102 | spin_lock_bh(&smsg_list_lock); |
1da177e4 | 103 | list_add_tail(&cb->list, &smsg_list); |
5da5e658 | 104 | spin_unlock_bh(&smsg_list_lock); |
1da177e4 LT |
105 | return 0; |
106 | } | |
107 | ||
09003ed9 HB |
108 | void smsg_unregister_callback(const char *prefix, |
109 | void (*callback)(const char *from, | |
110 | char *str)) | |
1da177e4 LT |
111 | { |
112 | struct smsg_callback *cb, *tmp; | |
113 | ||
5da5e658 | 114 | spin_lock_bh(&smsg_list_lock); |
d2c993d8 | 115 | cb = NULL; |
1da177e4 LT |
116 | list_for_each_entry(tmp, &smsg_list, list) |
117 | if (tmp->callback == callback && | |
118 | strcmp(tmp->prefix, prefix) == 0) { | |
119 | cb = tmp; | |
120 | list_del(&cb->list); | |
121 | break; | |
122 | } | |
5da5e658 | 123 | spin_unlock_bh(&smsg_list_lock); |
1da177e4 LT |
124 | kfree(cb); |
125 | } | |
126 | ||
6a1d96dc MS |
127 | static int smsg_pm_freeze(struct device *dev) |
128 | { | |
129 | #ifdef CONFIG_PM_DEBUG | |
130 | printk(KERN_WARNING "smsg_pm_freeze\n"); | |
131 | #endif | |
59b60e97 | 132 | if (smsg_path && iucv_path_connected) { |
6a1d96dc | 133 | iucv_path_sever(smsg_path, NULL); |
59b60e97 UB |
134 | iucv_path_connected = 0; |
135 | } | |
6a1d96dc MS |
136 | return 0; |
137 | } | |
138 | ||
139 | static int smsg_pm_restore_thaw(struct device *dev) | |
140 | { | |
141 | int rc; | |
142 | ||
143 | #ifdef CONFIG_PM_DEBUG | |
144 | printk(KERN_WARNING "smsg_pm_restore_thaw\n"); | |
145 | #endif | |
1c8161a8 | 146 | if (smsg_path && !iucv_path_connected) { |
6a1d96dc MS |
147 | memset(smsg_path, 0, sizeof(*smsg_path)); |
148 | smsg_path->msglim = 255; | |
149 | smsg_path->flags = 0; | |
150 | rc = iucv_path_connect(smsg_path, &smsg_handler, "*MSG ", | |
151 | NULL, NULL, NULL); | |
8ca45667 MS |
152 | #ifdef CONFIG_PM_DEBUG |
153 | if (rc) | |
154 | printk(KERN_ERR | |
155 | "iucv_path_connect returned with rc %i\n", rc); | |
156 | #endif | |
59b60e97 UB |
157 | if (!rc) |
158 | iucv_path_connected = 1; | |
8ca45667 | 159 | cpcmd("SET SMSG IUCV", NULL, 0, NULL); |
6a1d96dc MS |
160 | } |
161 | return 0; | |
162 | } | |
163 | ||
47145210 | 164 | static const struct dev_pm_ops smsg_pm_ops = { |
6a1d96dc MS |
165 | .freeze = smsg_pm_freeze, |
166 | .thaw = smsg_pm_restore_thaw, | |
167 | .restore = smsg_pm_restore_thaw, | |
168 | }; | |
169 | ||
5da5e658 | 170 | static struct device_driver smsg_driver = { |
6a1d96dc | 171 | .owner = THIS_MODULE, |
1ffaa640 | 172 | .name = SMSGIUCV_DRV_NAME, |
5da5e658 | 173 | .bus = &iucv_bus, |
6a1d96dc | 174 | .pm = &smsg_pm_ops, |
5da5e658 MS |
175 | }; |
176 | ||
177 | static void __exit smsg_exit(void) | |
1da177e4 | 178 | { |
5da5e658 | 179 | cpcmd("SET SMSG IUCV", NULL, 0, NULL); |
6a1d96dc | 180 | device_unregister(smsg_dev); |
5da5e658 MS |
181 | iucv_unregister(&smsg_handler, 1); |
182 | driver_unregister(&smsg_driver); | |
1da177e4 LT |
183 | } |
184 | ||
5da5e658 | 185 | static int __init smsg_init(void) |
1da177e4 | 186 | { |
1da177e4 LT |
187 | int rc; |
188 | ||
0fc3ddd6 CB |
189 | if (!MACHINE_IS_VM) { |
190 | rc = -EPROTONOSUPPORT; | |
191 | goto out; | |
192 | } | |
1da177e4 | 193 | rc = driver_register(&smsg_driver); |
5da5e658 MS |
194 | if (rc != 0) |
195 | goto out; | |
196 | rc = iucv_register(&smsg_handler, 1); | |
d5ddc809 | 197 | if (rc) |
5da5e658 | 198 | goto out_driver; |
5da5e658 MS |
199 | smsg_path = iucv_path_alloc(255, 0, GFP_KERNEL); |
200 | if (!smsg_path) { | |
201 | rc = -ENOMEM; | |
202 | goto out_register; | |
1da177e4 | 203 | } |
5da5e658 MS |
204 | rc = iucv_path_connect(smsg_path, &smsg_handler, "*MSG ", |
205 | NULL, NULL, NULL); | |
d5ddc809 | 206 | if (rc) |
6a1d96dc | 207 | goto out_free_path; |
59b60e97 UB |
208 | else |
209 | iucv_path_connected = 1; | |
6a1d96dc MS |
210 | smsg_dev = kzalloc(sizeof(struct device), GFP_KERNEL); |
211 | if (!smsg_dev) { | |
212 | rc = -ENOMEM; | |
213 | goto out_free_path; | |
214 | } | |
215 | dev_set_name(smsg_dev, "smsg_iucv"); | |
216 | smsg_dev->bus = &iucv_bus; | |
217 | smsg_dev->parent = iucv_root; | |
218 | smsg_dev->release = (void (*)(struct device *))kfree; | |
219 | smsg_dev->driver = &smsg_driver; | |
220 | rc = device_register(smsg_dev); | |
221 | if (rc) | |
c6304933 | 222 | goto out_put; |
6a1d96dc | 223 | |
6b979de3 | 224 | cpcmd("SET SMSG IUCV", NULL, 0, NULL); |
1da177e4 | 225 | return 0; |
5da5e658 | 226 | |
c6304933 SO |
227 | out_put: |
228 | put_device(smsg_dev); | |
6a1d96dc | 229 | out_free_path: |
5da5e658 | 230 | iucv_path_free(smsg_path); |
6a1d96dc | 231 | smsg_path = NULL; |
5da5e658 MS |
232 | out_register: |
233 | iucv_unregister(&smsg_handler, 1); | |
234 | out_driver: | |
235 | driver_unregister(&smsg_driver); | |
236 | out: | |
237 | return rc; | |
1da177e4 LT |
238 | } |
239 | ||
240 | module_init(smsg_init); | |
241 | module_exit(smsg_exit); | |
242 | MODULE_LICENSE("GPL"); | |
243 | ||
244 | EXPORT_SYMBOL(smsg_register_callback); | |
245 | EXPORT_SYMBOL(smsg_unregister_callback); |