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1da177e4 LT |
1 | /* |
2 | * Author: Martin Peschke <mpeschke@de.ibm.com> | |
3 | * Copyright (C) 2001 IBM Entwicklung GmbH, IBM Corporation | |
4 | * | |
5 | * SCLP Control-Program Identification. | |
6 | */ | |
7 | ||
1da177e4 LT |
8 | #include <linux/version.h> |
9 | #include <linux/kmod.h> | |
10 | #include <linux/module.h> | |
11 | #include <linux/moduleparam.h> | |
12 | #include <linux/init.h> | |
13 | #include <linux/timer.h> | |
14 | #include <linux/string.h> | |
15 | #include <linux/err.h> | |
16 | #include <linux/slab.h> | |
17 | #include <asm/ebcdic.h> | |
18 | #include <asm/semaphore.h> | |
19 | ||
20 | #include "sclp.h" | |
21 | #include "sclp_rw.h" | |
22 | ||
23 | #define CPI_LENGTH_SYSTEM_TYPE 8 | |
24 | #define CPI_LENGTH_SYSTEM_NAME 8 | |
25 | #define CPI_LENGTH_SYSPLEX_NAME 8 | |
26 | ||
27 | struct cpi_evbuf { | |
28 | struct evbuf_header header; | |
29 | u8 id_format; | |
30 | u8 reserved0; | |
31 | u8 system_type[CPI_LENGTH_SYSTEM_TYPE]; | |
32 | u64 reserved1; | |
33 | u8 system_name[CPI_LENGTH_SYSTEM_NAME]; | |
34 | u64 reserved2; | |
35 | u64 system_level; | |
36 | u64 reserved3; | |
37 | u8 sysplex_name[CPI_LENGTH_SYSPLEX_NAME]; | |
38 | u8 reserved4[16]; | |
39 | } __attribute__((packed)); | |
40 | ||
41 | struct cpi_sccb { | |
42 | struct sccb_header header; | |
43 | struct cpi_evbuf cpi_evbuf; | |
44 | } __attribute__((packed)); | |
45 | ||
46 | /* Event type structure for write message and write priority message */ | |
47 | static struct sclp_register sclp_cpi_event = | |
48 | { | |
6d4740c8 | 49 | .send_mask = EVTYP_CTLPROGIDENT_MASK |
1da177e4 LT |
50 | }; |
51 | ||
b3c14d0b CB |
52 | MODULE_LICENSE("GPL"); |
53 | ||
1da177e4 LT |
54 | MODULE_AUTHOR( |
55 | "Martin Peschke, IBM Deutschland Entwicklung GmbH " | |
56 | "<mpeschke@de.ibm.com>"); | |
57 | ||
58 | MODULE_DESCRIPTION( | |
59 | "identify this operating system instance to the S/390 " | |
60 | "or zSeries hardware"); | |
61 | ||
62 | static char *system_name = NULL; | |
63 | module_param(system_name, charp, 0); | |
64 | MODULE_PARM_DESC(system_name, "e.g. hostname - max. 8 characters"); | |
65 | ||
66 | static char *sysplex_name = NULL; | |
67 | #ifdef ALLOW_SYSPLEX_NAME | |
68 | module_param(sysplex_name, charp, 0); | |
69 | MODULE_PARM_DESC(sysplex_name, "if applicable - max. 8 characters"); | |
70 | #endif | |
71 | ||
72 | /* use default value for this field (as well as for system level) */ | |
73 | static char *system_type = "LINUX"; | |
74 | ||
75 | static int | |
76 | cpi_check_parms(void) | |
77 | { | |
78 | /* reject if no system type specified */ | |
79 | if (!system_type) { | |
80 | printk("cpi: bug: no system type specified\n"); | |
81 | return -EINVAL; | |
82 | } | |
83 | ||
84 | /* reject if system type larger than 8 characters */ | |
85 | if (strlen(system_type) > CPI_LENGTH_SYSTEM_NAME) { | |
86 | printk("cpi: bug: system type has length of %li characters - " | |
87 | "only %i characters supported\n", | |
88 | strlen(system_type), CPI_LENGTH_SYSTEM_TYPE); | |
89 | return -EINVAL; | |
90 | } | |
91 | ||
92 | /* reject if no system name specified */ | |
93 | if (!system_name) { | |
94 | printk("cpi: no system name specified\n"); | |
95 | return -EINVAL; | |
96 | } | |
97 | ||
98 | /* reject if system name larger than 8 characters */ | |
99 | if (strlen(system_name) > CPI_LENGTH_SYSTEM_NAME) { | |
100 | printk("cpi: system name has length of %li characters - " | |
101 | "only %i characters supported\n", | |
102 | strlen(system_name), CPI_LENGTH_SYSTEM_NAME); | |
103 | return -EINVAL; | |
104 | } | |
105 | ||
106 | /* reject if specified sysplex name larger than 8 characters */ | |
107 | if (sysplex_name && strlen(sysplex_name) > CPI_LENGTH_SYSPLEX_NAME) { | |
108 | printk("cpi: sysplex name has length of %li characters" | |
109 | " - only %i characters supported\n", | |
110 | strlen(sysplex_name), CPI_LENGTH_SYSPLEX_NAME); | |
111 | return -EINVAL; | |
112 | } | |
113 | return 0; | |
114 | } | |
115 | ||
116 | static void | |
117 | cpi_callback(struct sclp_req *req, void *data) | |
118 | { | |
119 | struct semaphore *sem; | |
120 | ||
121 | sem = (struct semaphore *) data; | |
122 | up(sem); | |
123 | } | |
124 | ||
125 | static struct sclp_req * | |
126 | cpi_prepare_req(void) | |
127 | { | |
128 | struct sclp_req *req; | |
129 | struct cpi_sccb *sccb; | |
130 | struct cpi_evbuf *evb; | |
131 | ||
5cbded58 | 132 | req = kmalloc(sizeof(struct sclp_req), GFP_KERNEL); |
1da177e4 LT |
133 | if (req == NULL) |
134 | return ERR_PTR(-ENOMEM); | |
135 | sccb = (struct cpi_sccb *) __get_free_page(GFP_KERNEL | GFP_DMA); | |
136 | if (sccb == NULL) { | |
137 | kfree(req); | |
138 | return ERR_PTR(-ENOMEM); | |
139 | } | |
140 | memset(sccb, 0, sizeof(struct cpi_sccb)); | |
141 | ||
142 | /* setup SCCB for Control-Program Identification */ | |
143 | sccb->header.length = sizeof(struct cpi_sccb); | |
144 | sccb->cpi_evbuf.header.length = sizeof(struct cpi_evbuf); | |
145 | sccb->cpi_evbuf.header.type = 0x0B; | |
146 | evb = &sccb->cpi_evbuf; | |
147 | ||
148 | /* set system type */ | |
149 | memset(evb->system_type, ' ', CPI_LENGTH_SYSTEM_TYPE); | |
150 | memcpy(evb->system_type, system_type, strlen(system_type)); | |
151 | sclp_ascebc_str(evb->system_type, CPI_LENGTH_SYSTEM_TYPE); | |
152 | EBC_TOUPPER(evb->system_type, CPI_LENGTH_SYSTEM_TYPE); | |
153 | ||
154 | /* set system name */ | |
155 | memset(evb->system_name, ' ', CPI_LENGTH_SYSTEM_NAME); | |
156 | memcpy(evb->system_name, system_name, strlen(system_name)); | |
157 | sclp_ascebc_str(evb->system_name, CPI_LENGTH_SYSTEM_NAME); | |
158 | EBC_TOUPPER(evb->system_name, CPI_LENGTH_SYSTEM_NAME); | |
159 | ||
3a4fa0a2 | 160 | /* set system level */ |
1da177e4 LT |
161 | evb->system_level = LINUX_VERSION_CODE; |
162 | ||
163 | /* set sysplex name */ | |
164 | if (sysplex_name) { | |
165 | memset(evb->sysplex_name, ' ', CPI_LENGTH_SYSPLEX_NAME); | |
166 | memcpy(evb->sysplex_name, sysplex_name, strlen(sysplex_name)); | |
167 | sclp_ascebc_str(evb->sysplex_name, CPI_LENGTH_SYSPLEX_NAME); | |
168 | EBC_TOUPPER(evb->sysplex_name, CPI_LENGTH_SYSPLEX_NAME); | |
169 | } | |
170 | ||
171 | /* prepare request data structure presented to SCLP driver */ | |
ab14de6c | 172 | req->command = SCLP_CMDW_WRITE_EVENT_DATA; |
1da177e4 LT |
173 | req->sccb = sccb; |
174 | req->status = SCLP_REQ_FILLED; | |
175 | req->callback = cpi_callback; | |
176 | return req; | |
177 | } | |
178 | ||
179 | static void | |
180 | cpi_free_req(struct sclp_req *req) | |
181 | { | |
182 | free_page((unsigned long) req->sccb); | |
183 | kfree(req); | |
184 | } | |
185 | ||
186 | static int __init | |
187 | cpi_module_init(void) | |
188 | { | |
189 | struct semaphore sem; | |
190 | struct sclp_req *req; | |
191 | int rc; | |
192 | ||
193 | rc = cpi_check_parms(); | |
194 | if (rc) | |
195 | return rc; | |
196 | ||
197 | rc = sclp_register(&sclp_cpi_event); | |
198 | if (rc) { | |
199 | /* could not register sclp event. Die. */ | |
200 | printk(KERN_WARNING "cpi: could not register to hardware " | |
201 | "console.\n"); | |
202 | return -EINVAL; | |
203 | } | |
6d4740c8 | 204 | if (!(sclp_cpi_event.sclp_send_mask & EVTYP_CTLPROGIDENT_MASK)) { |
1da177e4 LT |
205 | printk(KERN_WARNING "cpi: no control program identification " |
206 | "support\n"); | |
207 | sclp_unregister(&sclp_cpi_event); | |
9bbc8346 | 208 | return -EOPNOTSUPP; |
1da177e4 LT |
209 | } |
210 | ||
211 | req = cpi_prepare_req(); | |
212 | if (IS_ERR(req)) { | |
213 | printk(KERN_WARNING "cpi: couldn't allocate request\n"); | |
214 | sclp_unregister(&sclp_cpi_event); | |
215 | return PTR_ERR(req); | |
216 | } | |
217 | ||
218 | /* Prepare semaphore */ | |
219 | sema_init(&sem, 0); | |
220 | req->callback_data = &sem; | |
221 | /* Add request to sclp queue */ | |
222 | rc = sclp_add_request(req); | |
223 | if (rc) { | |
224 | printk(KERN_WARNING "cpi: could not start request\n"); | |
225 | cpi_free_req(req); | |
226 | sclp_unregister(&sclp_cpi_event); | |
227 | return rc; | |
228 | } | |
229 | /* make "insmod" sleep until callback arrives */ | |
230 | down(&sem); | |
231 | ||
232 | rc = ((struct cpi_sccb *) req->sccb)->header.response_code; | |
233 | if (rc != 0x0020) { | |
234 | printk(KERN_WARNING "cpi: failed with response code 0x%x\n", | |
235 | rc); | |
236 | rc = -ECOMM; | |
237 | } else | |
238 | rc = 0; | |
239 | ||
240 | cpi_free_req(req); | |
241 | sclp_unregister(&sclp_cpi_event); | |
242 | ||
243 | return rc; | |
244 | } | |
245 | ||
246 | ||
247 | static void __exit cpi_module_exit(void) | |
248 | { | |
249 | } | |
250 | ||
251 | ||
252 | /* declare driver module init/cleanup functions */ | |
253 | module_init(cpi_module_init); | |
254 | module_exit(cpi_module_exit); | |
255 |