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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
c05ffc4f | 2 | /* |
c05ffc4f ME |
3 | * SCLP control program identification sysfs interface |
4 | * | |
5 | * Copyright IBM Corp. 2001, 2007 | |
6 | * Author(s): Martin Peschke <mpeschke@de.ibm.com> | |
7 | * Michael Ernst <mernst@de.ibm.com> | |
8 | */ | |
9 | ||
b3ff088b MS |
10 | #define KMSG_COMPONENT "sclp_cpi" |
11 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
12 | ||
c05ffc4f ME |
13 | #include <linux/kernel.h> |
14 | #include <linux/init.h> | |
15 | #include <linux/stat.h> | |
16 | #include <linux/device.h> | |
17 | #include <linux/string.h> | |
18 | #include <linux/ctype.h> | |
19 | #include <linux/kmod.h> | |
20 | #include <linux/timer.h> | |
21 | #include <linux/err.h> | |
22 | #include <linux/slab.h> | |
23 | #include <linux/completion.h> | |
3a4c5d59 | 24 | #include <linux/export.h> |
c05ffc4f ME |
25 | #include <asm/ebcdic.h> |
26 | #include <asm/sclp.h> | |
b3ff088b | 27 | |
c05ffc4f ME |
28 | #include "sclp.h" |
29 | #include "sclp_rw.h" | |
30 | #include "sclp_cpi_sys.h" | |
31 | ||
32 | #define CPI_LENGTH_NAME 8 | |
33 | #define CPI_LENGTH_LEVEL 16 | |
34 | ||
b1c02d91 ME |
35 | static DEFINE_MUTEX(sclp_cpi_mutex); |
36 | ||
c05ffc4f ME |
37 | struct cpi_evbuf { |
38 | struct evbuf_header header; | |
39 | u8 id_format; | |
40 | u8 reserved0; | |
41 | u8 system_type[CPI_LENGTH_NAME]; | |
42 | u64 reserved1; | |
43 | u8 system_name[CPI_LENGTH_NAME]; | |
44 | u64 reserved2; | |
45 | u64 system_level; | |
46 | u64 reserved3; | |
47 | u8 sysplex_name[CPI_LENGTH_NAME]; | |
48 | u8 reserved4[16]; | |
49 | } __attribute__((packed)); | |
50 | ||
51 | struct cpi_sccb { | |
52 | struct sccb_header header; | |
53 | struct cpi_evbuf cpi_evbuf; | |
54 | } __attribute__((packed)); | |
55 | ||
56 | static struct sclp_register sclp_cpi_event = { | |
57 | .send_mask = EVTYP_CTLPROGIDENT_MASK, | |
58 | }; | |
59 | ||
60 | static char system_name[CPI_LENGTH_NAME + 1]; | |
61 | static char sysplex_name[CPI_LENGTH_NAME + 1]; | |
62 | static char system_type[CPI_LENGTH_NAME + 1]; | |
63 | static u64 system_level; | |
64 | ||
65 | static void set_data(char *field, char *data) | |
66 | { | |
67 | memset(field, ' ', CPI_LENGTH_NAME); | |
68 | memcpy(field, data, strlen(data)); | |
69 | sclp_ascebc_str(field, CPI_LENGTH_NAME); | |
70 | } | |
71 | ||
72 | static void cpi_callback(struct sclp_req *req, void *data) | |
73 | { | |
74 | struct completion *completion = data; | |
75 | ||
76 | complete(completion); | |
77 | } | |
78 | ||
79 | static struct sclp_req *cpi_prepare_req(void) | |
80 | { | |
81 | struct sclp_req *req; | |
82 | struct cpi_sccb *sccb; | |
83 | struct cpi_evbuf *evb; | |
84 | ||
85 | req = kzalloc(sizeof(struct sclp_req), GFP_KERNEL); | |
86 | if (!req) | |
87 | return ERR_PTR(-ENOMEM); | |
88 | sccb = (struct cpi_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA); | |
89 | if (!sccb) { | |
90 | kfree(req); | |
91 | return ERR_PTR(-ENOMEM); | |
92 | } | |
93 | ||
94 | /* setup SCCB for Control-Program Identification */ | |
95 | sccb->header.length = sizeof(struct cpi_sccb); | |
96 | sccb->cpi_evbuf.header.length = sizeof(struct cpi_evbuf); | |
3fa7ee88 | 97 | sccb->cpi_evbuf.header.type = EVTYP_CTLPROGIDENT; |
c05ffc4f ME |
98 | evb = &sccb->cpi_evbuf; |
99 | ||
100 | /* set system type */ | |
101 | set_data(evb->system_type, system_type); | |
102 | ||
103 | /* set system name */ | |
104 | set_data(evb->system_name, system_name); | |
105 | ||
88393161 | 106 | /* set system level */ |
c05ffc4f ME |
107 | evb->system_level = system_level; |
108 | ||
109 | /* set sysplex name */ | |
110 | set_data(evb->sysplex_name, sysplex_name); | |
111 | ||
112 | /* prepare request data structure presented to SCLP driver */ | |
113 | req->command = SCLP_CMDW_WRITE_EVENT_DATA; | |
114 | req->sccb = sccb; | |
115 | req->status = SCLP_REQ_FILLED; | |
116 | req->callback = cpi_callback; | |
117 | return req; | |
118 | } | |
119 | ||
120 | static void cpi_free_req(struct sclp_req *req) | |
121 | { | |
122 | free_page((unsigned long) req->sccb); | |
123 | kfree(req); | |
124 | } | |
125 | ||
126 | static int cpi_req(void) | |
127 | { | |
128 | struct completion completion; | |
129 | struct sclp_req *req; | |
130 | int rc; | |
131 | int response; | |
132 | ||
133 | rc = sclp_register(&sclp_cpi_event); | |
a12c53f4 | 134 | if (rc) |
c05ffc4f | 135 | goto out; |
d082d3ce | 136 | if (!(sclp_cpi_event.sclp_receive_mask & EVTYP_CTLPROGIDENT_MASK)) { |
c05ffc4f ME |
137 | rc = -EOPNOTSUPP; |
138 | goto out_unregister; | |
139 | } | |
140 | ||
141 | req = cpi_prepare_req(); | |
142 | if (IS_ERR(req)) { | |
c05ffc4f ME |
143 | rc = PTR_ERR(req); |
144 | goto out_unregister; | |
145 | } | |
146 | ||
147 | init_completion(&completion); | |
148 | req->callback_data = &completion; | |
149 | ||
150 | /* Add request to sclp queue */ | |
151 | rc = sclp_add_request(req); | |
a12c53f4 | 152 | if (rc) |
c05ffc4f | 153 | goto out_free_req; |
c05ffc4f ME |
154 | |
155 | wait_for_completion(&completion); | |
156 | ||
157 | if (req->status != SCLP_REQ_DONE) { | |
baebc70a | 158 | pr_warn("request failed (status=0x%02x)\n", req->status); |
c05ffc4f ME |
159 | rc = -EIO; |
160 | goto out_free_req; | |
161 | } | |
162 | ||
163 | response = ((struct cpi_sccb *) req->sccb)->header.response_code; | |
164 | if (response != 0x0020) { | |
baebc70a | 165 | pr_warn("request failed with response code 0x%x\n", response); |
c05ffc4f ME |
166 | rc = -EIO; |
167 | } | |
168 | ||
169 | out_free_req: | |
170 | cpi_free_req(req); | |
171 | ||
172 | out_unregister: | |
173 | sclp_unregister(&sclp_cpi_event); | |
174 | ||
175 | out: | |
176 | return rc; | |
177 | } | |
178 | ||
179 | static int check_string(const char *attr, const char *str) | |
180 | { | |
181 | size_t len; | |
182 | size_t i; | |
183 | ||
184 | len = strlen(str); | |
185 | ||
186 | if ((len > 0) && (str[len - 1] == '\n')) | |
187 | len--; | |
188 | ||
189 | if (len > CPI_LENGTH_NAME) | |
190 | return -EINVAL; | |
191 | ||
192 | for (i = 0; i < len ; i++) { | |
193 | if (isalpha(str[i]) || isdigit(str[i]) || | |
194 | strchr("$@# ", str[i])) | |
195 | continue; | |
196 | return -EINVAL; | |
197 | } | |
198 | ||
199 | return 0; | |
200 | } | |
201 | ||
202 | static void set_string(char *attr, const char *value) | |
203 | { | |
204 | size_t len; | |
205 | size_t i; | |
206 | ||
207 | len = strlen(value); | |
208 | ||
209 | if ((len > 0) && (value[len - 1] == '\n')) | |
210 | len--; | |
211 | ||
212 | for (i = 0; i < CPI_LENGTH_NAME; i++) { | |
213 | if (i < len) | |
214 | attr[i] = toupper(value[i]); | |
215 | else | |
216 | attr[i] = ' '; | |
217 | } | |
218 | } | |
219 | ||
220 | static ssize_t system_name_show(struct kobject *kobj, | |
221 | struct kobj_attribute *attr, char *page) | |
222 | { | |
b1c02d91 ME |
223 | int rc; |
224 | ||
225 | mutex_lock(&sclp_cpi_mutex); | |
226 | rc = snprintf(page, PAGE_SIZE, "%s\n", system_name); | |
227 | mutex_unlock(&sclp_cpi_mutex); | |
228 | return rc; | |
c05ffc4f ME |
229 | } |
230 | ||
231 | static ssize_t system_name_store(struct kobject *kobj, | |
232 | struct kobj_attribute *attr, | |
233 | const char *buf, | |
234 | size_t len) | |
235 | { | |
236 | int rc; | |
237 | ||
238 | rc = check_string("system_name", buf); | |
239 | if (rc) | |
240 | return rc; | |
241 | ||
b1c02d91 | 242 | mutex_lock(&sclp_cpi_mutex); |
c05ffc4f | 243 | set_string(system_name, buf); |
b1c02d91 | 244 | mutex_unlock(&sclp_cpi_mutex); |
c05ffc4f ME |
245 | |
246 | return len; | |
247 | } | |
248 | ||
249 | static struct kobj_attribute system_name_attr = | |
250 | __ATTR(system_name, 0644, system_name_show, system_name_store); | |
251 | ||
252 | static ssize_t sysplex_name_show(struct kobject *kobj, | |
253 | struct kobj_attribute *attr, char *page) | |
254 | { | |
b1c02d91 ME |
255 | int rc; |
256 | ||
257 | mutex_lock(&sclp_cpi_mutex); | |
258 | rc = snprintf(page, PAGE_SIZE, "%s\n", sysplex_name); | |
259 | mutex_unlock(&sclp_cpi_mutex); | |
260 | return rc; | |
c05ffc4f ME |
261 | } |
262 | ||
263 | static ssize_t sysplex_name_store(struct kobject *kobj, | |
264 | struct kobj_attribute *attr, | |
265 | const char *buf, | |
266 | size_t len) | |
267 | { | |
268 | int rc; | |
269 | ||
270 | rc = check_string("sysplex_name", buf); | |
271 | if (rc) | |
272 | return rc; | |
273 | ||
b1c02d91 | 274 | mutex_lock(&sclp_cpi_mutex); |
c05ffc4f | 275 | set_string(sysplex_name, buf); |
b1c02d91 | 276 | mutex_unlock(&sclp_cpi_mutex); |
c05ffc4f ME |
277 | |
278 | return len; | |
279 | } | |
280 | ||
281 | static struct kobj_attribute sysplex_name_attr = | |
282 | __ATTR(sysplex_name, 0644, sysplex_name_show, sysplex_name_store); | |
283 | ||
284 | static ssize_t system_type_show(struct kobject *kobj, | |
285 | struct kobj_attribute *attr, char *page) | |
286 | { | |
b1c02d91 ME |
287 | int rc; |
288 | ||
289 | mutex_lock(&sclp_cpi_mutex); | |
290 | rc = snprintf(page, PAGE_SIZE, "%s\n", system_type); | |
291 | mutex_unlock(&sclp_cpi_mutex); | |
292 | return rc; | |
c05ffc4f ME |
293 | } |
294 | ||
295 | static ssize_t system_type_store(struct kobject *kobj, | |
296 | struct kobj_attribute *attr, | |
297 | const char *buf, | |
298 | size_t len) | |
299 | { | |
300 | int rc; | |
301 | ||
302 | rc = check_string("system_type", buf); | |
303 | if (rc) | |
304 | return rc; | |
305 | ||
b1c02d91 | 306 | mutex_lock(&sclp_cpi_mutex); |
c05ffc4f | 307 | set_string(system_type, buf); |
b1c02d91 | 308 | mutex_unlock(&sclp_cpi_mutex); |
c05ffc4f ME |
309 | |
310 | return len; | |
311 | } | |
312 | ||
313 | static struct kobj_attribute system_type_attr = | |
314 | __ATTR(system_type, 0644, system_type_show, system_type_store); | |
315 | ||
316 | static ssize_t system_level_show(struct kobject *kobj, | |
317 | struct kobj_attribute *attr, char *page) | |
318 | { | |
b1c02d91 | 319 | unsigned long long level; |
c05ffc4f | 320 | |
b1c02d91 ME |
321 | mutex_lock(&sclp_cpi_mutex); |
322 | level = system_level; | |
323 | mutex_unlock(&sclp_cpi_mutex); | |
c05ffc4f ME |
324 | return snprintf(page, PAGE_SIZE, "%#018llx\n", level); |
325 | } | |
326 | ||
327 | static ssize_t system_level_store(struct kobject *kobj, | |
328 | struct kobj_attribute *attr, | |
329 | const char *buf, | |
330 | size_t len) | |
331 | { | |
332 | unsigned long long level; | |
333 | char *endp; | |
334 | ||
335 | level = simple_strtoull(buf, &endp, 16); | |
336 | ||
337 | if (endp == buf) | |
338 | return -EINVAL; | |
339 | if (*endp == '\n') | |
340 | endp++; | |
341 | if (*endp) | |
342 | return -EINVAL; | |
343 | ||
b1c02d91 | 344 | mutex_lock(&sclp_cpi_mutex); |
c05ffc4f | 345 | system_level = level; |
b1c02d91 | 346 | mutex_unlock(&sclp_cpi_mutex); |
c05ffc4f ME |
347 | return len; |
348 | } | |
349 | ||
350 | static struct kobj_attribute system_level_attr = | |
351 | __ATTR(system_level, 0644, system_level_show, system_level_store); | |
352 | ||
353 | static ssize_t set_store(struct kobject *kobj, | |
354 | struct kobj_attribute *attr, | |
355 | const char *buf, size_t len) | |
356 | { | |
357 | int rc; | |
358 | ||
b1c02d91 | 359 | mutex_lock(&sclp_cpi_mutex); |
c05ffc4f | 360 | rc = cpi_req(); |
b1c02d91 | 361 | mutex_unlock(&sclp_cpi_mutex); |
c05ffc4f ME |
362 | if (rc) |
363 | return rc; | |
364 | ||
365 | return len; | |
366 | } | |
367 | ||
368 | static struct kobj_attribute set_attr = __ATTR(set, 0200, NULL, set_store); | |
369 | ||
370 | static struct attribute *cpi_attrs[] = { | |
371 | &system_name_attr.attr, | |
372 | &sysplex_name_attr.attr, | |
373 | &system_type_attr.attr, | |
374 | &system_level_attr.attr, | |
375 | &set_attr.attr, | |
376 | NULL, | |
377 | }; | |
378 | ||
379 | static struct attribute_group cpi_attr_group = { | |
380 | .attrs = cpi_attrs, | |
381 | }; | |
382 | ||
383 | static struct kset *cpi_kset; | |
384 | ||
385 | int sclp_cpi_set_data(const char *system, const char *sysplex, const char *type, | |
386 | const u64 level) | |
387 | { | |
388 | int rc; | |
389 | ||
390 | rc = check_string("system_name", system); | |
391 | if (rc) | |
392 | return rc; | |
393 | rc = check_string("sysplex_name", sysplex); | |
394 | if (rc) | |
395 | return rc; | |
396 | rc = check_string("system_type", type); | |
397 | if (rc) | |
398 | return rc; | |
399 | ||
b1c02d91 | 400 | mutex_lock(&sclp_cpi_mutex); |
c05ffc4f ME |
401 | set_string(system_name, system); |
402 | set_string(sysplex_name, sysplex); | |
403 | set_string(system_type, type); | |
404 | system_level = level; | |
405 | ||
b1c02d91 ME |
406 | rc = cpi_req(); |
407 | mutex_unlock(&sclp_cpi_mutex); | |
408 | ||
409 | return rc; | |
c05ffc4f ME |
410 | } |
411 | EXPORT_SYMBOL(sclp_cpi_set_data); | |
412 | ||
413 | static int __init cpi_init(void) | |
414 | { | |
415 | int rc; | |
416 | ||
417 | cpi_kset = kset_create_and_add("cpi", NULL, firmware_kobj); | |
418 | if (!cpi_kset) | |
419 | return -ENOMEM; | |
420 | ||
421 | rc = sysfs_create_group(&cpi_kset->kobj, &cpi_attr_group); | |
422 | if (rc) | |
423 | kset_unregister(cpi_kset); | |
424 | ||
425 | return rc; | |
426 | } | |
427 | ||
428 | __initcall(cpi_init); |