1
2
3
4
5
6
7
8
9#define KMSG_COMPONENT "sclp_cpi"
10#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
11
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>
23#include <linux/export.h>
24#include <asm/ebcdic.h>
25#include <asm/sclp.h>
26
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
34static DEFINE_MUTEX(sclp_cpi_mutex);
35
36struct 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
50struct cpi_sccb {
51 struct sccb_header header;
52 struct cpi_evbuf cpi_evbuf;
53} __attribute__((packed));
54
55static struct sclp_register sclp_cpi_event = {
56 .send_mask = EVTYP_CTLPROGIDENT_MASK,
57};
58
59static char system_name[CPI_LENGTH_NAME + 1];
60static char sysplex_name[CPI_LENGTH_NAME + 1];
61static char system_type[CPI_LENGTH_NAME + 1];
62static u64 system_level;
63
64static 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
71static void cpi_callback(struct sclp_req *req, void *data)
72{
73 struct completion *completion = data;
74
75 complete(completion);
76}
77
78static 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
94 sccb->header.length = sizeof(struct cpi_sccb);
95 sccb->cpi_evbuf.header.length = sizeof(struct cpi_evbuf);
96 sccb->cpi_evbuf.header.type = 0x0b;
97 evb = &sccb->cpi_evbuf;
98
99
100 set_data(evb->system_type, system_type);
101
102
103 set_data(evb->system_name, system_name);
104
105
106 evb->system_level = system_level;
107
108
109 set_data(evb->sysplex_name, sysplex_name);
110
111
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
119static void cpi_free_req(struct sclp_req *req)
120{
121 free_page((unsigned long) req->sccb);
122 kfree(req);
123}
124
125static 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);
133 if (rc)
134 goto out;
135 if (!(sclp_cpi_event.sclp_receive_mask & EVTYP_CTLPROGIDENT_MASK)) {
136 rc = -EOPNOTSUPP;
137 goto out_unregister;
138 }
139
140 req = cpi_prepare_req();
141 if (IS_ERR(req)) {
142 rc = PTR_ERR(req);
143 goto out_unregister;
144 }
145
146 init_completion(&completion);
147 req->callback_data = &completion;
148
149
150 rc = sclp_add_request(req);
151 if (rc)
152 goto out_free_req;
153
154 wait_for_completion(&completion);
155
156 if (req->status != SCLP_REQ_DONE) {
157 pr_warn("request failed (status=0x%02x)\n", req->status);
158 rc = -EIO;
159 goto out_free_req;
160 }
161
162 response = ((struct cpi_sccb *) req->sccb)->header.response_code;
163 if (response != 0x0020) {
164 pr_warn("request failed with response code 0x%x\n", response);
165 rc = -EIO;
166 }
167
168out_free_req:
169 cpi_free_req(req);
170
171out_unregister:
172 sclp_unregister(&sclp_cpi_event);
173
174out:
175 return rc;
176}
177
178static 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
201static 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
219static ssize_t system_name_show(struct kobject *kobj,
220 struct kobj_attribute *attr, char *page)
221{
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;
228}
229
230static 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
241 mutex_lock(&sclp_cpi_mutex);
242 set_string(system_name, buf);
243 mutex_unlock(&sclp_cpi_mutex);
244
245 return len;
246}
247
248static struct kobj_attribute system_name_attr =
249 __ATTR(system_name, 0644, system_name_show, system_name_store);
250
251static ssize_t sysplex_name_show(struct kobject *kobj,
252 struct kobj_attribute *attr, char *page)
253{
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;
260}
261
262static 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
273 mutex_lock(&sclp_cpi_mutex);
274 set_string(sysplex_name, buf);
275 mutex_unlock(&sclp_cpi_mutex);
276
277 return len;
278}
279
280static struct kobj_attribute sysplex_name_attr =
281 __ATTR(sysplex_name, 0644, sysplex_name_show, sysplex_name_store);
282
283static ssize_t system_type_show(struct kobject *kobj,
284 struct kobj_attribute *attr, char *page)
285{
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;
292}
293
294static 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
305 mutex_lock(&sclp_cpi_mutex);
306 set_string(system_type, buf);
307 mutex_unlock(&sclp_cpi_mutex);
308
309 return len;
310}
311
312static struct kobj_attribute system_type_attr =
313 __ATTR(system_type, 0644, system_type_show, system_type_store);
314
315static ssize_t system_level_show(struct kobject *kobj,
316 struct kobj_attribute *attr, char *page)
317{
318 unsigned long long level;
319
320 mutex_lock(&sclp_cpi_mutex);
321 level = system_level;
322 mutex_unlock(&sclp_cpi_mutex);
323 return snprintf(page, PAGE_SIZE, "%#018llx\n", level);
324}
325
326static 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
343 mutex_lock(&sclp_cpi_mutex);
344 system_level = level;
345 mutex_unlock(&sclp_cpi_mutex);
346 return len;
347}
348
349static struct kobj_attribute system_level_attr =
350 __ATTR(system_level, 0644, system_level_show, system_level_store);
351
352static ssize_t set_store(struct kobject *kobj,
353 struct kobj_attribute *attr,
354 const char *buf, size_t len)
355{
356 int rc;
357
358 mutex_lock(&sclp_cpi_mutex);
359 rc = cpi_req();
360 mutex_unlock(&sclp_cpi_mutex);
361 if (rc)
362 return rc;
363
364 return len;
365}
366
367static struct kobj_attribute set_attr = __ATTR(set, 0200, NULL, set_store);
368
369static 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
378static struct attribute_group cpi_attr_group = {
379 .attrs = cpi_attrs,
380};
381
382static struct kset *cpi_kset;
383
384int 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
399 mutex_lock(&sclp_cpi_mutex);
400 set_string(system_name, system);
401 set_string(sysplex_name, sysplex);
402 set_string(system_type, type);
403 system_level = level;
404
405 rc = cpi_req();
406 mutex_unlock(&sclp_cpi_mutex);
407
408 return rc;
409}
410EXPORT_SYMBOL(sclp_cpi_set_data);
411
412static 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);
428
