Commit | Line | Data |
---|---|---|
c05ffc4f | 1 | /* |
c05ffc4f ME |
2 | * SCLP control program identification sysfs interface |
3 | * | |
4 | * Copyright IBM Corp. 2001, 2007 | |
5 | * Author(s): Martin Peschke <mpeschke@de.ibm.com> | |
6 | * Michael Ernst <mernst@de.ibm.com> | |
7 | */ | |
8 | ||
b3ff088b MS |
9 | #define KMSG_COMPONENT "sclp_cpi" |
10 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
11 | ||
c05ffc4f ME |
12 | #include <linux/kernel.h> |
13 | #include <linux/init.h> | |
14 | #include <linux/stat.h> | |
15 | #include <linux/device.h> | |
16 | #include <linux/string.h> | |
17 | #include <linux/ctype.h> | |
18 | #include <linux/kmod.h> | |
19 | #include <linux/timer.h> | |
20 | #include <linux/err.h> | |
21 | #include <linux/slab.h> | |
22 | #include <linux/completion.h> | |
3a4c5d59 | 23 | #include <linux/export.h> |
c05ffc4f ME |
24 | #include <asm/ebcdic.h> |
25 | #include <asm/sclp.h> | |
b3ff088b | 26 | |
c05ffc4f ME |
27 | #include "sclp.h" |
28 | #include "sclp_rw.h" | |
29 | #include "sclp_cpi_sys.h" | |
30 | ||
31 | #define CPI_LENGTH_NAME 8 | |
32 | #define CPI_LENGTH_LEVEL 16 | |
33 | ||
b1c02d91 ME |
34 | static DEFINE_MUTEX(sclp_cpi_mutex); |
35 | ||
c05ffc4f ME |
36 | struct cpi_evbuf { |
37 | struct evbuf_header header; | |
38 | u8 id_format; | |
39 | u8 reserved0; | |
40 | u8 system_type[CPI_LENGTH_NAME]; | |
41 | u64 reserved1; | |
42 | u8 system_name[CPI_LENGTH_NAME]; | |
43 | u64 reserved2; | |
44 | u64 system_level; | |
45 | u64 reserved3; | |
46 | u8 sysplex_name[CPI_LENGTH_NAME]; | |
47 | u8 reserved4[16]; | |
48 | } __attribute__((packed)); | |
49 | ||
50 | struct cpi_sccb { | |
51 | struct sccb_header header; | |
52 | struct cpi_evbuf cpi_evbuf; | |
53 | } __attribute__((packed)); | |
54 | ||
55 | static struct sclp_register sclp_cpi_event = { | |
56 | .send_mask = EVTYP_CTLPROGIDENT_MASK, | |
57 | }; | |
58 | ||
59 | static char system_name[CPI_LENGTH_NAME + 1]; | |
60 | static char sysplex_name[CPI_LENGTH_NAME + 1]; | |
61 | static char system_type[CPI_LENGTH_NAME + 1]; | |
62 | static u64 system_level; | |
63 | ||
64 | static void set_data(char *field, char *data) | |
65 | { | |
66 | memset(field, ' ', CPI_LENGTH_NAME); | |
67 | memcpy(field, data, strlen(data)); | |
68 | sclp_ascebc_str(field, CPI_LENGTH_NAME); | |
69 | } | |
70 | ||
71 | static void cpi_callback(struct sclp_req *req, void *data) | |
72 | { | |
73 | struct completion *completion = data; | |
74 | ||
75 | complete(completion); | |
76 | } | |
77 | ||
78 | static struct sclp_req *cpi_prepare_req(void) | |
79 | { | |
80 | struct sclp_req *req; | |
81 | struct cpi_sccb *sccb; | |
82 | struct cpi_evbuf *evb; | |
83 | ||
84 | req = kzalloc(sizeof(struct sclp_req), GFP_KERNEL); | |
85 | if (!req) | |
86 | return ERR_PTR(-ENOMEM); | |
87 | sccb = (struct cpi_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA); | |
88 | if (!sccb) { | |
89 | kfree(req); | |
90 | return ERR_PTR(-ENOMEM); | |
91 | } | |
92 | ||
93 | /* setup SCCB for Control-Program Identification */ | |
94 | sccb->header.length = sizeof(struct cpi_sccb); | |
95 | sccb->cpi_evbuf.header.length = sizeof(struct cpi_evbuf); | |
3fa7ee88 | 96 | sccb->cpi_evbuf.header.type = EVTYP_CTLPROGIDENT; |
c05ffc4f ME |
97 | evb = &sccb->cpi_evbuf; |
98 | ||
99 | /* set system type */ | |
100 | set_data(evb->system_type, system_type); | |
101 | ||
102 | /* set system name */ | |
103 | set_data(evb->system_name, system_name); | |
104 | ||
88393161 | 105 | /* set system level */ |
c05ffc4f ME |
106 | evb->system_level = system_level; |
107 | ||
108 | /* set sysplex name */ | |
109 | set_data(evb->sysplex_name, sysplex_name); | |
110 | ||
111 | /* prepare request data structure presented to SCLP driver */ | |
112 | req->command = SCLP_CMDW_WRITE_EVENT_DATA; | |
113 | req->sccb = sccb; | |
114 | req->status = SCLP_REQ_FILLED; | |
115 | req->callback = cpi_callback; | |
116 | return req; | |
117 | } | |
118 | ||
119 | static void cpi_free_req(struct sclp_req *req) | |
120 | { | |
121 | free_page((unsigned long) req->sccb); | |
122 | kfree(req); | |
123 | } | |
124 | ||
125 | static int cpi_req(void) | |
126 | { | |
127 | struct completion completion; | |
128 | struct sclp_req *req; | |
129 | int rc; | |
130 | int response; | |
131 | ||
132 | rc = sclp_register(&sclp_cpi_event); | |
a12c53f4 | 133 | if (rc) |
c05ffc4f | 134 | goto out; |
d082d3ce | 135 | if (!(sclp_cpi_event.sclp_receive_mask & EVTYP_CTLPROGIDENT_MASK)) { |
c05ffc4f ME |
136 | rc = -EOPNOTSUPP; |
137 | goto out_unregister; | |
138 | } | |
139 | ||
140 | req = cpi_prepare_req(); | |
141 | if (IS_ERR(req)) { | |
c05ffc4f ME |
142 | rc = PTR_ERR(req); |
143 | goto out_unregister; | |
144 | } | |
145 | ||
146 | init_completion(&completion); | |
147 | req->callback_data = &completion; | |
148 | ||
149 | /* Add request to sclp queue */ | |
150 | rc = sclp_add_request(req); | |
a12c53f4 | 151 | if (rc) |
c05ffc4f | 152 | goto out_free_req; |
c05ffc4f ME |
153 | |
154 | wait_for_completion(&completion); | |
155 | ||
156 | if (req->status != SCLP_REQ_DONE) { | |
baebc70a | 157 | pr_warn("request failed (status=0x%02x)\n", req->status); |
c05ffc4f ME |
158 | rc = -EIO; |
159 | goto out_free_req; | |
160 | } | |
161 | ||
162 | response = ((struct cpi_sccb *) req->sccb)->header.response_code; | |
163 | if (response != 0x0020) { | |
baebc70a | 164 | pr_warn("request failed with response code 0x%x\n", response); |
c05ffc4f ME |
165 | rc = -EIO; |
166 | } | |
167 | ||
168 | out_free_req: | |
169 | cpi_free_req(req); | |
170 | ||
171 | out_unregister: | |
172 | sclp_unregister(&sclp_cpi_event); | |
173 | ||
174 | out: | |
175 | return rc; | |
176 | } | |
177 | ||
178 | static int check_string(const char *attr, const char *str) | |
179 | { | |
180 | size_t len; | |
181 | size_t i; | |
182 | ||
183 | len = strlen(str); | |
184 | ||
185 | if ((len > 0) && (str[len - 1] == '\n')) | |
186 | len--; | |
187 | ||
188 | if (len > CPI_LENGTH_NAME) | |
189 | return -EINVAL; | |
190 | ||
191 | for (i = 0; i < len ; i++) { | |
192 | if (isalpha(str[i]) || isdigit(str[i]) || | |
193 | strchr("$@# ", str[i])) | |
194 | continue; | |
195 | return -EINVAL; | |
196 | } | |
197 | ||
198 | return 0; | |
199 | } | |
200 | ||
201 | static void set_string(char *attr, const char *value) | |
202 | { | |
203 | size_t len; | |
204 | size_t i; | |
205 | ||
206 | len = strlen(value); | |
207 | ||
208 | if ((len > 0) && (value[len - 1] == '\n')) | |
209 | len--; | |
210 | ||
211 | for (i = 0; i < CPI_LENGTH_NAME; i++) { | |
212 | if (i < len) | |
213 | attr[i] = toupper(value[i]); | |
214 | else | |
215 | attr[i] = ' '; | |
216 | } | |
217 | } | |
218 | ||
219 | static ssize_t system_name_show(struct kobject *kobj, | |
220 | struct kobj_attribute *attr, char *page) | |
221 | { | |
b1c02d91 ME |
222 | int rc; |
223 | ||
224 | mutex_lock(&sclp_cpi_mutex); | |
225 | rc = snprintf(page, PAGE_SIZE, "%s\n", system_name); | |
226 | mutex_unlock(&sclp_cpi_mutex); | |
227 | return rc; | |
c05ffc4f ME |
228 | } |
229 | ||
230 | static ssize_t system_name_store(struct kobject *kobj, | |
231 | struct kobj_attribute *attr, | |
232 | const char *buf, | |
233 | size_t len) | |
234 | { | |
235 | int rc; | |
236 | ||
237 | rc = check_string("system_name", buf); | |
238 | if (rc) | |
239 | return rc; | |
240 | ||
b1c02d91 | 241 | mutex_lock(&sclp_cpi_mutex); |
c05ffc4f | 242 | set_string(system_name, buf); |
b1c02d91 | 243 | mutex_unlock(&sclp_cpi_mutex); |
c05ffc4f ME |
244 | |
245 | return len; | |
246 | } | |
247 | ||
248 | static struct kobj_attribute system_name_attr = | |
249 | __ATTR(system_name, 0644, system_name_show, system_name_store); | |
250 | ||
251 | static ssize_t sysplex_name_show(struct kobject *kobj, | |
252 | struct kobj_attribute *attr, char *page) | |
253 | { | |
b1c02d91 ME |
254 | int rc; |
255 | ||
256 | mutex_lock(&sclp_cpi_mutex); | |
257 | rc = snprintf(page, PAGE_SIZE, "%s\n", sysplex_name); | |
258 | mutex_unlock(&sclp_cpi_mutex); | |
259 | return rc; | |
c05ffc4f ME |
260 | } |
261 | ||
262 | static ssize_t sysplex_name_store(struct kobject *kobj, | |
263 | struct kobj_attribute *attr, | |
264 | const char *buf, | |
265 | size_t len) | |
266 | { | |
267 | int rc; | |
268 | ||
269 | rc = check_string("sysplex_name", buf); | |
270 | if (rc) | |
271 | return rc; | |
272 | ||
b1c02d91 | 273 | mutex_lock(&sclp_cpi_mutex); |
c05ffc4f | 274 | set_string(sysplex_name, buf); |
b1c02d91 | 275 | mutex_unlock(&sclp_cpi_mutex); |
c05ffc4f ME |
276 | |
277 | return len; | |
278 | } | |
279 | ||
280 | static struct kobj_attribute sysplex_name_attr = | |
281 | __ATTR(sysplex_name, 0644, sysplex_name_show, sysplex_name_store); | |
282 | ||
283 | static ssize_t system_type_show(struct kobject *kobj, | |
284 | struct kobj_attribute *attr, char *page) | |
285 | { | |
b1c02d91 ME |
286 | int rc; |
287 | ||
288 | mutex_lock(&sclp_cpi_mutex); | |
289 | rc = snprintf(page, PAGE_SIZE, "%s\n", system_type); | |
290 | mutex_unlock(&sclp_cpi_mutex); | |
291 | return rc; | |
c05ffc4f ME |
292 | } |
293 | ||
294 | static ssize_t system_type_store(struct kobject *kobj, | |
295 | struct kobj_attribute *attr, | |
296 | const char *buf, | |
297 | size_t len) | |
298 | { | |
299 | int rc; | |
300 | ||
301 | rc = check_string("system_type", buf); | |
302 | if (rc) | |
303 | return rc; | |
304 | ||
b1c02d91 | 305 | mutex_lock(&sclp_cpi_mutex); |
c05ffc4f | 306 | set_string(system_type, buf); |
b1c02d91 | 307 | mutex_unlock(&sclp_cpi_mutex); |
c05ffc4f ME |
308 | |
309 | return len; | |
310 | } | |
311 | ||
312 | static struct kobj_attribute system_type_attr = | |
313 | __ATTR(system_type, 0644, system_type_show, system_type_store); | |
314 | ||
315 | static ssize_t system_level_show(struct kobject *kobj, | |
316 | struct kobj_attribute *attr, char *page) | |
317 | { | |
b1c02d91 | 318 | unsigned long long level; |
c05ffc4f | 319 | |
b1c02d91 ME |
320 | mutex_lock(&sclp_cpi_mutex); |
321 | level = system_level; | |
322 | mutex_unlock(&sclp_cpi_mutex); | |
c05ffc4f ME |
323 | return snprintf(page, PAGE_SIZE, "%#018llx\n", level); |
324 | } | |
325 | ||
326 | static ssize_t system_level_store(struct kobject *kobj, | |
327 | struct kobj_attribute *attr, | |
328 | const char *buf, | |
329 | size_t len) | |
330 | { | |
331 | unsigned long long level; | |
332 | char *endp; | |
333 | ||
334 | level = simple_strtoull(buf, &endp, 16); | |
335 | ||
336 | if (endp == buf) | |
337 | return -EINVAL; | |
338 | if (*endp == '\n') | |
339 | endp++; | |
340 | if (*endp) | |
341 | return -EINVAL; | |
342 | ||
b1c02d91 | 343 | mutex_lock(&sclp_cpi_mutex); |
c05ffc4f | 344 | system_level = level; |
b1c02d91 | 345 | mutex_unlock(&sclp_cpi_mutex); |
c05ffc4f ME |
346 | return len; |
347 | } | |
348 | ||
349 | static struct kobj_attribute system_level_attr = | |
350 | __ATTR(system_level, 0644, system_level_show, system_level_store); | |
351 | ||
352 | static ssize_t set_store(struct kobject *kobj, | |
353 | struct kobj_attribute *attr, | |
354 | const char *buf, size_t len) | |
355 | { | |
356 | int rc; | |
357 | ||
b1c02d91 | 358 | mutex_lock(&sclp_cpi_mutex); |
c05ffc4f | 359 | rc = cpi_req(); |
b1c02d91 | 360 | mutex_unlock(&sclp_cpi_mutex); |
c05ffc4f ME |
361 | if (rc) |
362 | return rc; | |
363 | ||
364 | return len; | |
365 | } | |
366 | ||
367 | static struct kobj_attribute set_attr = __ATTR(set, 0200, NULL, set_store); | |
368 | ||
369 | static struct attribute *cpi_attrs[] = { | |
370 | &system_name_attr.attr, | |
371 | &sysplex_name_attr.attr, | |
372 | &system_type_attr.attr, | |
373 | &system_level_attr.attr, | |
374 | &set_attr.attr, | |
375 | NULL, | |
376 | }; | |
377 | ||
378 | static struct attribute_group cpi_attr_group = { | |
379 | .attrs = cpi_attrs, | |
380 | }; | |
381 | ||
382 | static struct kset *cpi_kset; | |
383 | ||
384 | int sclp_cpi_set_data(const char *system, const char *sysplex, const char *type, | |
385 | const u64 level) | |
386 | { | |
387 | int rc; | |
388 | ||
389 | rc = check_string("system_name", system); | |
390 | if (rc) | |
391 | return rc; | |
392 | rc = check_string("sysplex_name", sysplex); | |
393 | if (rc) | |
394 | return rc; | |
395 | rc = check_string("system_type", type); | |
396 | if (rc) | |
397 | return rc; | |
398 | ||
b1c02d91 | 399 | mutex_lock(&sclp_cpi_mutex); |
c05ffc4f ME |
400 | set_string(system_name, system); |
401 | set_string(sysplex_name, sysplex); | |
402 | set_string(system_type, type); | |
403 | system_level = level; | |
404 | ||
b1c02d91 ME |
405 | rc = cpi_req(); |
406 | mutex_unlock(&sclp_cpi_mutex); | |
407 | ||
408 | return rc; | |
c05ffc4f ME |
409 | } |
410 | EXPORT_SYMBOL(sclp_cpi_set_data); | |
411 | ||
412 | static int __init cpi_init(void) | |
413 | { | |
414 | int rc; | |
415 | ||
416 | cpi_kset = kset_create_and_add("cpi", NULL, firmware_kobj); | |
417 | if (!cpi_kset) | |
418 | return -ENOMEM; | |
419 | ||
420 | rc = sysfs_create_group(&cpi_kset->kobj, &cpi_attr_group); | |
421 | if (rc) | |
422 | kset_unregister(cpi_kset); | |
423 | ||
424 | return rc; | |
425 | } | |
426 | ||
427 | __initcall(cpi_init); |