2 * drivers/s390/char/sclp_cpi_sys.c
3 * SCLP control program identification sysfs interface
5 * Copyright IBM Corp. 2001, 2007
6 * Author(s): Martin Peschke <mpeschke@de.ibm.com>
7 * Michael Ernst <mernst@de.ibm.com>
10 #define KMSG_COMPONENT "sclp_cpi"
11 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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>
30 #include "sclp_cpi_sys.h"
32 #define CPI_LENGTH_NAME 8
33 #define CPI_LENGTH_LEVEL 16
35 static DEFINE_MUTEX(sclp_cpi_mutex);
38 struct evbuf_header header;
41 u8 system_type[CPI_LENGTH_NAME];
43 u8 system_name[CPI_LENGTH_NAME];
47 u8 sysplex_name[CPI_LENGTH_NAME];
49 } __attribute__((packed));
52 struct sccb_header header;
53 struct cpi_evbuf cpi_evbuf;
54 } __attribute__((packed));
56 static struct sclp_register sclp_cpi_event = {
57 .send_mask = EVTYP_CTLPROGIDENT_MASK,
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;
65 static void set_data(char *field, char *data)
67 memset(field, ' ', CPI_LENGTH_NAME);
68 memcpy(field, data, strlen(data));
69 sclp_ascebc_str(field, CPI_LENGTH_NAME);
72 static void cpi_callback(struct sclp_req *req, void *data)
74 struct completion *completion = data;
79 static struct sclp_req *cpi_prepare_req(void)
82 struct cpi_sccb *sccb;
83 struct cpi_evbuf *evb;
85 req = kzalloc(sizeof(struct sclp_req), GFP_KERNEL);
87 return ERR_PTR(-ENOMEM);
88 sccb = (struct cpi_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
91 return ERR_PTR(-ENOMEM);
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 = 0x0b;
98 evb = &sccb->cpi_evbuf;
100 /* set system type */
101 set_data(evb->system_type, system_type);
103 /* set system name */
104 set_data(evb->system_name, system_name);
106 /* set system level */
107 evb->system_level = system_level;
109 /* set sysplex name */
110 set_data(evb->sysplex_name, sysplex_name);
112 /* prepare request data structure presented to SCLP driver */
113 req->command = SCLP_CMDW_WRITE_EVENT_DATA;
115 req->status = SCLP_REQ_FILLED;
116 req->callback = cpi_callback;
120 static void cpi_free_req(struct sclp_req *req)
122 free_page((unsigned long) req->sccb);
126 static int cpi_req(void)
128 struct completion completion;
129 struct sclp_req *req;
133 rc = sclp_register(&sclp_cpi_event);
136 if (!(sclp_cpi_event.sclp_receive_mask & EVTYP_CTLPROGIDENT_MASK)) {
141 req = cpi_prepare_req();
147 init_completion(&completion);
148 req->callback_data = &completion;
150 /* Add request to sclp queue */
151 rc = sclp_add_request(req);
155 wait_for_completion(&completion);
157 if (req->status != SCLP_REQ_DONE) {
158 pr_warning("request failed (status=0x%02x)\n",
164 response = ((struct cpi_sccb *) req->sccb)->header.response_code;
165 if (response != 0x0020) {
166 pr_warning("request failed with response code 0x%x\n",
175 sclp_unregister(&sclp_cpi_event);
181 static int check_string(const char *attr, const char *str)
188 if ((len > 0) && (str[len - 1] == '\n'))
191 if (len > CPI_LENGTH_NAME)
194 for (i = 0; i < len ; i++) {
195 if (isalpha(str[i]) || isdigit(str[i]) ||
196 strchr("$@# ", str[i]))
204 static void set_string(char *attr, const char *value)
211 if ((len > 0) && (value[len - 1] == '\n'))
214 for (i = 0; i < CPI_LENGTH_NAME; i++) {
216 attr[i] = toupper(value[i]);
222 static ssize_t system_name_show(struct kobject *kobj,
223 struct kobj_attribute *attr, char *page)
227 mutex_lock(&sclp_cpi_mutex);
228 rc = snprintf(page, PAGE_SIZE, "%s\n", system_name);
229 mutex_unlock(&sclp_cpi_mutex);
233 static ssize_t system_name_store(struct kobject *kobj,
234 struct kobj_attribute *attr,
240 rc = check_string("system_name", buf);
244 mutex_lock(&sclp_cpi_mutex);
245 set_string(system_name, buf);
246 mutex_unlock(&sclp_cpi_mutex);
251 static struct kobj_attribute system_name_attr =
252 __ATTR(system_name, 0644, system_name_show, system_name_store);
254 static ssize_t sysplex_name_show(struct kobject *kobj,
255 struct kobj_attribute *attr, char *page)
259 mutex_lock(&sclp_cpi_mutex);
260 rc = snprintf(page, PAGE_SIZE, "%s\n", sysplex_name);
261 mutex_unlock(&sclp_cpi_mutex);
265 static ssize_t sysplex_name_store(struct kobject *kobj,
266 struct kobj_attribute *attr,
272 rc = check_string("sysplex_name", buf);
276 mutex_lock(&sclp_cpi_mutex);
277 set_string(sysplex_name, buf);
278 mutex_unlock(&sclp_cpi_mutex);
283 static struct kobj_attribute sysplex_name_attr =
284 __ATTR(sysplex_name, 0644, sysplex_name_show, sysplex_name_store);
286 static ssize_t system_type_show(struct kobject *kobj,
287 struct kobj_attribute *attr, char *page)
291 mutex_lock(&sclp_cpi_mutex);
292 rc = snprintf(page, PAGE_SIZE, "%s\n", system_type);
293 mutex_unlock(&sclp_cpi_mutex);
297 static ssize_t system_type_store(struct kobject *kobj,
298 struct kobj_attribute *attr,
304 rc = check_string("system_type", buf);
308 mutex_lock(&sclp_cpi_mutex);
309 set_string(system_type, buf);
310 mutex_unlock(&sclp_cpi_mutex);
315 static struct kobj_attribute system_type_attr =
316 __ATTR(system_type, 0644, system_type_show, system_type_store);
318 static ssize_t system_level_show(struct kobject *kobj,
319 struct kobj_attribute *attr, char *page)
321 unsigned long long level;
323 mutex_lock(&sclp_cpi_mutex);
324 level = system_level;
325 mutex_unlock(&sclp_cpi_mutex);
326 return snprintf(page, PAGE_SIZE, "%#018llx\n", level);
329 static ssize_t system_level_store(struct kobject *kobj,
330 struct kobj_attribute *attr,
334 unsigned long long level;
337 level = simple_strtoull(buf, &endp, 16);
346 mutex_lock(&sclp_cpi_mutex);
347 system_level = level;
348 mutex_unlock(&sclp_cpi_mutex);
352 static struct kobj_attribute system_level_attr =
353 __ATTR(system_level, 0644, system_level_show, system_level_store);
355 static ssize_t set_store(struct kobject *kobj,
356 struct kobj_attribute *attr,
357 const char *buf, size_t len)
361 mutex_lock(&sclp_cpi_mutex);
363 mutex_unlock(&sclp_cpi_mutex);
370 static struct kobj_attribute set_attr = __ATTR(set, 0200, NULL, set_store);
372 static struct attribute *cpi_attrs[] = {
373 &system_name_attr.attr,
374 &sysplex_name_attr.attr,
375 &system_type_attr.attr,
376 &system_level_attr.attr,
381 static struct attribute_group cpi_attr_group = {
385 static struct kset *cpi_kset;
387 int sclp_cpi_set_data(const char *system, const char *sysplex, const char *type,
392 rc = check_string("system_name", system);
395 rc = check_string("sysplex_name", sysplex);
398 rc = check_string("system_type", type);
402 mutex_lock(&sclp_cpi_mutex);
403 set_string(system_name, system);
404 set_string(sysplex_name, sysplex);
405 set_string(system_type, type);
406 system_level = level;
409 mutex_unlock(&sclp_cpi_mutex);
413 EXPORT_SYMBOL(sclp_cpi_set_data);
415 static int __init cpi_init(void)
419 cpi_kset = kset_create_and_add("cpi", NULL, firmware_kobj);
423 rc = sysfs_create_group(&cpi_kset->kobj, &cpi_attr_group);
425 kset_unregister(cpi_kset);
430 __initcall(cpi_init);