1 // SPDX-License-Identifier: GPL-2.0
2 /*
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
10 #define KMSG_COMPONENT "sclp_cpi"
11 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
12
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>
24 #include <linux/export.h>
25 #include <asm/ebcdic.h>
26 #include <asm/sclp.h>
27
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
35 static DEFINE_MUTEX(sclp_cpi_mutex);
36
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
set_data(char * field,char * data)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
cpi_callback(struct sclp_req * req,void * data)72 static void cpi_callback(struct sclp_req *req, void *data)
73 {
74 struct completion *completion = data;
75
76 complete(completion);
77 }
78
cpi_prepare_req(void)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);
97 sccb->cpi_evbuf.header.type = EVTYP_CTLPROGIDENT;
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
106 /* set system level */
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
cpi_free_req(struct sclp_req * req)120 static void cpi_free_req(struct sclp_req *req)
121 {
122 free_page((unsigned long) req->sccb);
123 kfree(req);
124 }
125
cpi_req(void)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);
134 if (rc)
135 goto out;
136 if (!(sclp_cpi_event.sclp_receive_mask & EVTYP_CTLPROGIDENT_MASK)) {
137 rc = -EOPNOTSUPP;
138 goto out_unregister;
139 }
140
141 req = cpi_prepare_req();
142 if (IS_ERR(req)) {
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);
152 if (rc)
153 goto out_free_req;
154
155 wait_for_completion(&completion);
156
157 if (req->status != SCLP_REQ_DONE) {
158 pr_warn("request failed (status=0x%02x)\n", req->status);
159 rc = -EIO;
160 goto out_free_req;
161 }
162
163 response = ((struct cpi_sccb *) req->sccb)->header.response_code;
164 if (response != 0x0020) {
165 pr_warn("request failed with response code 0x%x\n", response);
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
check_string(const char * attr,const char * str)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
set_string(char * attr,const char * value)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
system_name_show(struct kobject * kobj,struct kobj_attribute * attr,char * page)220 static ssize_t system_name_show(struct kobject *kobj,
221 struct kobj_attribute *attr, char *page)
222 {
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;
229 }
230
system_name_store(struct kobject * kobj,struct kobj_attribute * attr,const char * buf,size_t len)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
242 mutex_lock(&sclp_cpi_mutex);
243 set_string(system_name, buf);
244 mutex_unlock(&sclp_cpi_mutex);
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
sysplex_name_show(struct kobject * kobj,struct kobj_attribute * attr,char * page)252 static ssize_t sysplex_name_show(struct kobject *kobj,
253 struct kobj_attribute *attr, char *page)
254 {
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;
261 }
262
sysplex_name_store(struct kobject * kobj,struct kobj_attribute * attr,const char * buf,size_t len)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
274 mutex_lock(&sclp_cpi_mutex);
275 set_string(sysplex_name, buf);
276 mutex_unlock(&sclp_cpi_mutex);
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
system_type_show(struct kobject * kobj,struct kobj_attribute * attr,char * page)284 static ssize_t system_type_show(struct kobject *kobj,
285 struct kobj_attribute *attr, char *page)
286 {
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;
293 }
294
system_type_store(struct kobject * kobj,struct kobj_attribute * attr,const char * buf,size_t len)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
306 mutex_lock(&sclp_cpi_mutex);
307 set_string(system_type, buf);
308 mutex_unlock(&sclp_cpi_mutex);
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
system_level_show(struct kobject * kobj,struct kobj_attribute * attr,char * page)316 static ssize_t system_level_show(struct kobject *kobj,
317 struct kobj_attribute *attr, char *page)
318 {
319 unsigned long long level;
320
321 mutex_lock(&sclp_cpi_mutex);
322 level = system_level;
323 mutex_unlock(&sclp_cpi_mutex);
324 return snprintf(page, PAGE_SIZE, "%#018llx\n", level);
325 }
326
system_level_store(struct kobject * kobj,struct kobj_attribute * attr,const char * buf,size_t len)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
344 mutex_lock(&sclp_cpi_mutex);
345 system_level = level;
346 mutex_unlock(&sclp_cpi_mutex);
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
set_store(struct kobject * kobj,struct kobj_attribute * attr,const char * buf,size_t len)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
359 mutex_lock(&sclp_cpi_mutex);
360 rc = cpi_req();
361 mutex_unlock(&sclp_cpi_mutex);
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
sclp_cpi_set_data(const char * system,const char * sysplex,const char * type,const u64 level)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
400 mutex_lock(&sclp_cpi_mutex);
401 set_string(system_name, system);
402 set_string(sysplex_name, sysplex);
403 set_string(system_type, type);
404 system_level = level;
405
406 rc = cpi_req();
407 mutex_unlock(&sclp_cpi_mutex);
408
409 return rc;
410 }
411 EXPORT_SYMBOL(sclp_cpi_set_data);
412
cpi_init(void)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);
429