Michael Ernst | c05ffc4 | 2008-01-26 14:10:55 +0100 | [diff] [blame] | 1 | /* |
| 2 | * drivers/s390/char/sclp_cpi_sys.c |
| 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 | #include <linux/kernel.h> |
| 11 | #include <linux/init.h> |
| 12 | #include <linux/stat.h> |
| 13 | #include <linux/device.h> |
| 14 | #include <linux/string.h> |
| 15 | #include <linux/ctype.h> |
| 16 | #include <linux/kmod.h> |
| 17 | #include <linux/timer.h> |
| 18 | #include <linux/err.h> |
| 19 | #include <linux/slab.h> |
| 20 | #include <linux/completion.h> |
| 21 | #include <asm/ebcdic.h> |
| 22 | #include <asm/sclp.h> |
| 23 | #include "sclp.h" |
| 24 | #include "sclp_rw.h" |
| 25 | #include "sclp_cpi_sys.h" |
| 26 | |
| 27 | #define CPI_LENGTH_NAME 8 |
| 28 | #define CPI_LENGTH_LEVEL 16 |
| 29 | |
Michael Ernst | b1c02d9 | 2008-07-14 09:57:24 +0200 | [diff] [blame] | 30 | static DEFINE_MUTEX(sclp_cpi_mutex); |
| 31 | |
Michael Ernst | c05ffc4 | 2008-01-26 14:10:55 +0100 | [diff] [blame] | 32 | struct cpi_evbuf { |
| 33 | struct evbuf_header header; |
| 34 | u8 id_format; |
| 35 | u8 reserved0; |
| 36 | u8 system_type[CPI_LENGTH_NAME]; |
| 37 | u64 reserved1; |
| 38 | u8 system_name[CPI_LENGTH_NAME]; |
| 39 | u64 reserved2; |
| 40 | u64 system_level; |
| 41 | u64 reserved3; |
| 42 | u8 sysplex_name[CPI_LENGTH_NAME]; |
| 43 | u8 reserved4[16]; |
| 44 | } __attribute__((packed)); |
| 45 | |
| 46 | struct cpi_sccb { |
| 47 | struct sccb_header header; |
| 48 | struct cpi_evbuf cpi_evbuf; |
| 49 | } __attribute__((packed)); |
| 50 | |
| 51 | static struct sclp_register sclp_cpi_event = { |
| 52 | .send_mask = EVTYP_CTLPROGIDENT_MASK, |
| 53 | }; |
| 54 | |
| 55 | static char system_name[CPI_LENGTH_NAME + 1]; |
| 56 | static char sysplex_name[CPI_LENGTH_NAME + 1]; |
| 57 | static char system_type[CPI_LENGTH_NAME + 1]; |
| 58 | static u64 system_level; |
| 59 | |
| 60 | static void set_data(char *field, char *data) |
| 61 | { |
| 62 | memset(field, ' ', CPI_LENGTH_NAME); |
| 63 | memcpy(field, data, strlen(data)); |
| 64 | sclp_ascebc_str(field, CPI_LENGTH_NAME); |
| 65 | } |
| 66 | |
| 67 | static void cpi_callback(struct sclp_req *req, void *data) |
| 68 | { |
| 69 | struct completion *completion = data; |
| 70 | |
| 71 | complete(completion); |
| 72 | } |
| 73 | |
| 74 | static struct sclp_req *cpi_prepare_req(void) |
| 75 | { |
| 76 | struct sclp_req *req; |
| 77 | struct cpi_sccb *sccb; |
| 78 | struct cpi_evbuf *evb; |
| 79 | |
| 80 | req = kzalloc(sizeof(struct sclp_req), GFP_KERNEL); |
| 81 | if (!req) |
| 82 | return ERR_PTR(-ENOMEM); |
| 83 | sccb = (struct cpi_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA); |
| 84 | if (!sccb) { |
| 85 | kfree(req); |
| 86 | return ERR_PTR(-ENOMEM); |
| 87 | } |
| 88 | |
| 89 | /* setup SCCB for Control-Program Identification */ |
| 90 | sccb->header.length = sizeof(struct cpi_sccb); |
| 91 | sccb->cpi_evbuf.header.length = sizeof(struct cpi_evbuf); |
| 92 | sccb->cpi_evbuf.header.type = 0x0b; |
| 93 | evb = &sccb->cpi_evbuf; |
| 94 | |
| 95 | /* set system type */ |
| 96 | set_data(evb->system_type, system_type); |
| 97 | |
| 98 | /* set system name */ |
| 99 | set_data(evb->system_name, system_name); |
| 100 | |
| 101 | /* set sytem level */ |
| 102 | evb->system_level = system_level; |
| 103 | |
| 104 | /* set sysplex name */ |
| 105 | set_data(evb->sysplex_name, sysplex_name); |
| 106 | |
| 107 | /* prepare request data structure presented to SCLP driver */ |
| 108 | req->command = SCLP_CMDW_WRITE_EVENT_DATA; |
| 109 | req->sccb = sccb; |
| 110 | req->status = SCLP_REQ_FILLED; |
| 111 | req->callback = cpi_callback; |
| 112 | return req; |
| 113 | } |
| 114 | |
| 115 | static void cpi_free_req(struct sclp_req *req) |
| 116 | { |
| 117 | free_page((unsigned long) req->sccb); |
| 118 | kfree(req); |
| 119 | } |
| 120 | |
| 121 | static int cpi_req(void) |
| 122 | { |
| 123 | struct completion completion; |
| 124 | struct sclp_req *req; |
| 125 | int rc; |
| 126 | int response; |
| 127 | |
| 128 | rc = sclp_register(&sclp_cpi_event); |
Martin Schwidefsky | a12c53f | 2008-07-14 09:59:28 +0200 | [diff] [blame] | 129 | if (rc) |
Michael Ernst | c05ffc4 | 2008-01-26 14:10:55 +0100 | [diff] [blame] | 130 | goto out; |
Peter Oberparleiter | d082d3c | 2008-02-19 15:29:32 +0100 | [diff] [blame] | 131 | if (!(sclp_cpi_event.sclp_receive_mask & EVTYP_CTLPROGIDENT_MASK)) { |
Michael Ernst | c05ffc4 | 2008-01-26 14:10:55 +0100 | [diff] [blame] | 132 | rc = -EOPNOTSUPP; |
| 133 | goto out_unregister; |
| 134 | } |
| 135 | |
| 136 | req = cpi_prepare_req(); |
| 137 | if (IS_ERR(req)) { |
Michael Ernst | c05ffc4 | 2008-01-26 14:10:55 +0100 | [diff] [blame] | 138 | rc = PTR_ERR(req); |
| 139 | goto out_unregister; |
| 140 | } |
| 141 | |
| 142 | init_completion(&completion); |
| 143 | req->callback_data = &completion; |
| 144 | |
| 145 | /* Add request to sclp queue */ |
| 146 | rc = sclp_add_request(req); |
Martin Schwidefsky | a12c53f | 2008-07-14 09:59:28 +0200 | [diff] [blame] | 147 | if (rc) |
Michael Ernst | c05ffc4 | 2008-01-26 14:10:55 +0100 | [diff] [blame] | 148 | goto out_free_req; |
Michael Ernst | c05ffc4 | 2008-01-26 14:10:55 +0100 | [diff] [blame] | 149 | |
| 150 | wait_for_completion(&completion); |
| 151 | |
| 152 | if (req->status != SCLP_REQ_DONE) { |
| 153 | printk(KERN_WARNING "cpi: request failed (status=0x%02x)\n", |
| 154 | req->status); |
| 155 | rc = -EIO; |
| 156 | goto out_free_req; |
| 157 | } |
| 158 | |
| 159 | response = ((struct cpi_sccb *) req->sccb)->header.response_code; |
| 160 | if (response != 0x0020) { |
| 161 | printk(KERN_WARNING "cpi: failed with " |
| 162 | "response code 0x%x\n", response); |
| 163 | rc = -EIO; |
| 164 | } |
| 165 | |
| 166 | out_free_req: |
| 167 | cpi_free_req(req); |
| 168 | |
| 169 | out_unregister: |
| 170 | sclp_unregister(&sclp_cpi_event); |
| 171 | |
| 172 | out: |
| 173 | return rc; |
| 174 | } |
| 175 | |
| 176 | static int check_string(const char *attr, const char *str) |
| 177 | { |
| 178 | size_t len; |
| 179 | size_t i; |
| 180 | |
| 181 | len = strlen(str); |
| 182 | |
| 183 | if ((len > 0) && (str[len - 1] == '\n')) |
| 184 | len--; |
| 185 | |
| 186 | if (len > CPI_LENGTH_NAME) |
| 187 | return -EINVAL; |
| 188 | |
| 189 | for (i = 0; i < len ; i++) { |
| 190 | if (isalpha(str[i]) || isdigit(str[i]) || |
| 191 | strchr("$@# ", str[i])) |
| 192 | continue; |
| 193 | return -EINVAL; |
| 194 | } |
| 195 | |
| 196 | return 0; |
| 197 | } |
| 198 | |
| 199 | static void set_string(char *attr, const char *value) |
| 200 | { |
| 201 | size_t len; |
| 202 | size_t i; |
| 203 | |
| 204 | len = strlen(value); |
| 205 | |
| 206 | if ((len > 0) && (value[len - 1] == '\n')) |
| 207 | len--; |
| 208 | |
| 209 | for (i = 0; i < CPI_LENGTH_NAME; i++) { |
| 210 | if (i < len) |
| 211 | attr[i] = toupper(value[i]); |
| 212 | else |
| 213 | attr[i] = ' '; |
| 214 | } |
| 215 | } |
| 216 | |
| 217 | static ssize_t system_name_show(struct kobject *kobj, |
| 218 | struct kobj_attribute *attr, char *page) |
| 219 | { |
Michael Ernst | b1c02d9 | 2008-07-14 09:57:24 +0200 | [diff] [blame] | 220 | int rc; |
| 221 | |
| 222 | mutex_lock(&sclp_cpi_mutex); |
| 223 | rc = snprintf(page, PAGE_SIZE, "%s\n", system_name); |
| 224 | mutex_unlock(&sclp_cpi_mutex); |
| 225 | return rc; |
Michael Ernst | c05ffc4 | 2008-01-26 14:10:55 +0100 | [diff] [blame] | 226 | } |
| 227 | |
| 228 | static ssize_t system_name_store(struct kobject *kobj, |
| 229 | struct kobj_attribute *attr, |
| 230 | const char *buf, |
| 231 | size_t len) |
| 232 | { |
| 233 | int rc; |
| 234 | |
| 235 | rc = check_string("system_name", buf); |
| 236 | if (rc) |
| 237 | return rc; |
| 238 | |
Michael Ernst | b1c02d9 | 2008-07-14 09:57:24 +0200 | [diff] [blame] | 239 | mutex_lock(&sclp_cpi_mutex); |
Michael Ernst | c05ffc4 | 2008-01-26 14:10:55 +0100 | [diff] [blame] | 240 | set_string(system_name, buf); |
Michael Ernst | b1c02d9 | 2008-07-14 09:57:24 +0200 | [diff] [blame] | 241 | mutex_unlock(&sclp_cpi_mutex); |
Michael Ernst | c05ffc4 | 2008-01-26 14:10:55 +0100 | [diff] [blame] | 242 | |
| 243 | return len; |
| 244 | } |
| 245 | |
| 246 | static struct kobj_attribute system_name_attr = |
| 247 | __ATTR(system_name, 0644, system_name_show, system_name_store); |
| 248 | |
| 249 | static ssize_t sysplex_name_show(struct kobject *kobj, |
| 250 | struct kobj_attribute *attr, char *page) |
| 251 | { |
Michael Ernst | b1c02d9 | 2008-07-14 09:57:24 +0200 | [diff] [blame] | 252 | int rc; |
| 253 | |
| 254 | mutex_lock(&sclp_cpi_mutex); |
| 255 | rc = snprintf(page, PAGE_SIZE, "%s\n", sysplex_name); |
| 256 | mutex_unlock(&sclp_cpi_mutex); |
| 257 | return rc; |
Michael Ernst | c05ffc4 | 2008-01-26 14:10:55 +0100 | [diff] [blame] | 258 | } |
| 259 | |
| 260 | static ssize_t sysplex_name_store(struct kobject *kobj, |
| 261 | struct kobj_attribute *attr, |
| 262 | const char *buf, |
| 263 | size_t len) |
| 264 | { |
| 265 | int rc; |
| 266 | |
| 267 | rc = check_string("sysplex_name", buf); |
| 268 | if (rc) |
| 269 | return rc; |
| 270 | |
Michael Ernst | b1c02d9 | 2008-07-14 09:57:24 +0200 | [diff] [blame] | 271 | mutex_lock(&sclp_cpi_mutex); |
Michael Ernst | c05ffc4 | 2008-01-26 14:10:55 +0100 | [diff] [blame] | 272 | set_string(sysplex_name, buf); |
Michael Ernst | b1c02d9 | 2008-07-14 09:57:24 +0200 | [diff] [blame] | 273 | mutex_unlock(&sclp_cpi_mutex); |
Michael Ernst | c05ffc4 | 2008-01-26 14:10:55 +0100 | [diff] [blame] | 274 | |
| 275 | return len; |
| 276 | } |
| 277 | |
| 278 | static struct kobj_attribute sysplex_name_attr = |
| 279 | __ATTR(sysplex_name, 0644, sysplex_name_show, sysplex_name_store); |
| 280 | |
| 281 | static ssize_t system_type_show(struct kobject *kobj, |
| 282 | struct kobj_attribute *attr, char *page) |
| 283 | { |
Michael Ernst | b1c02d9 | 2008-07-14 09:57:24 +0200 | [diff] [blame] | 284 | int rc; |
| 285 | |
| 286 | mutex_lock(&sclp_cpi_mutex); |
| 287 | rc = snprintf(page, PAGE_SIZE, "%s\n", system_type); |
| 288 | mutex_unlock(&sclp_cpi_mutex); |
| 289 | return rc; |
Michael Ernst | c05ffc4 | 2008-01-26 14:10:55 +0100 | [diff] [blame] | 290 | } |
| 291 | |
| 292 | static ssize_t system_type_store(struct kobject *kobj, |
| 293 | struct kobj_attribute *attr, |
| 294 | const char *buf, |
| 295 | size_t len) |
| 296 | { |
| 297 | int rc; |
| 298 | |
| 299 | rc = check_string("system_type", buf); |
| 300 | if (rc) |
| 301 | return rc; |
| 302 | |
Michael Ernst | b1c02d9 | 2008-07-14 09:57:24 +0200 | [diff] [blame] | 303 | mutex_lock(&sclp_cpi_mutex); |
Michael Ernst | c05ffc4 | 2008-01-26 14:10:55 +0100 | [diff] [blame] | 304 | set_string(system_type, buf); |
Michael Ernst | b1c02d9 | 2008-07-14 09:57:24 +0200 | [diff] [blame] | 305 | mutex_unlock(&sclp_cpi_mutex); |
Michael Ernst | c05ffc4 | 2008-01-26 14:10:55 +0100 | [diff] [blame] | 306 | |
| 307 | return len; |
| 308 | } |
| 309 | |
| 310 | static struct kobj_attribute system_type_attr = |
| 311 | __ATTR(system_type, 0644, system_type_show, system_type_store); |
| 312 | |
| 313 | static ssize_t system_level_show(struct kobject *kobj, |
| 314 | struct kobj_attribute *attr, char *page) |
| 315 | { |
Michael Ernst | b1c02d9 | 2008-07-14 09:57:24 +0200 | [diff] [blame] | 316 | unsigned long long level; |
Michael Ernst | c05ffc4 | 2008-01-26 14:10:55 +0100 | [diff] [blame] | 317 | |
Michael Ernst | b1c02d9 | 2008-07-14 09:57:24 +0200 | [diff] [blame] | 318 | mutex_lock(&sclp_cpi_mutex); |
| 319 | level = system_level; |
| 320 | mutex_unlock(&sclp_cpi_mutex); |
Michael Ernst | c05ffc4 | 2008-01-26 14:10:55 +0100 | [diff] [blame] | 321 | return snprintf(page, PAGE_SIZE, "%#018llx\n", level); |
| 322 | } |
| 323 | |
| 324 | static ssize_t system_level_store(struct kobject *kobj, |
| 325 | struct kobj_attribute *attr, |
| 326 | const char *buf, |
| 327 | size_t len) |
| 328 | { |
| 329 | unsigned long long level; |
| 330 | char *endp; |
| 331 | |
| 332 | level = simple_strtoull(buf, &endp, 16); |
| 333 | |
| 334 | if (endp == buf) |
| 335 | return -EINVAL; |
| 336 | if (*endp == '\n') |
| 337 | endp++; |
| 338 | if (*endp) |
| 339 | return -EINVAL; |
| 340 | |
Michael Ernst | b1c02d9 | 2008-07-14 09:57:24 +0200 | [diff] [blame] | 341 | mutex_lock(&sclp_cpi_mutex); |
Michael Ernst | c05ffc4 | 2008-01-26 14:10:55 +0100 | [diff] [blame] | 342 | system_level = level; |
Michael Ernst | b1c02d9 | 2008-07-14 09:57:24 +0200 | [diff] [blame] | 343 | mutex_unlock(&sclp_cpi_mutex); |
Michael Ernst | c05ffc4 | 2008-01-26 14:10:55 +0100 | [diff] [blame] | 344 | return len; |
| 345 | } |
| 346 | |
| 347 | static struct kobj_attribute system_level_attr = |
| 348 | __ATTR(system_level, 0644, system_level_show, system_level_store); |
| 349 | |
| 350 | static ssize_t set_store(struct kobject *kobj, |
| 351 | struct kobj_attribute *attr, |
| 352 | const char *buf, size_t len) |
| 353 | { |
| 354 | int rc; |
| 355 | |
Michael Ernst | b1c02d9 | 2008-07-14 09:57:24 +0200 | [diff] [blame] | 356 | mutex_lock(&sclp_cpi_mutex); |
Michael Ernst | c05ffc4 | 2008-01-26 14:10:55 +0100 | [diff] [blame] | 357 | rc = cpi_req(); |
Michael Ernst | b1c02d9 | 2008-07-14 09:57:24 +0200 | [diff] [blame] | 358 | mutex_unlock(&sclp_cpi_mutex); |
Michael Ernst | c05ffc4 | 2008-01-26 14:10:55 +0100 | [diff] [blame] | 359 | if (rc) |
| 360 | return rc; |
| 361 | |
| 362 | return len; |
| 363 | } |
| 364 | |
| 365 | static struct kobj_attribute set_attr = __ATTR(set, 0200, NULL, set_store); |
| 366 | |
| 367 | static struct attribute *cpi_attrs[] = { |
| 368 | &system_name_attr.attr, |
| 369 | &sysplex_name_attr.attr, |
| 370 | &system_type_attr.attr, |
| 371 | &system_level_attr.attr, |
| 372 | &set_attr.attr, |
| 373 | NULL, |
| 374 | }; |
| 375 | |
| 376 | static struct attribute_group cpi_attr_group = { |
| 377 | .attrs = cpi_attrs, |
| 378 | }; |
| 379 | |
| 380 | static struct kset *cpi_kset; |
| 381 | |
| 382 | int sclp_cpi_set_data(const char *system, const char *sysplex, const char *type, |
| 383 | const u64 level) |
| 384 | { |
| 385 | int rc; |
| 386 | |
| 387 | rc = check_string("system_name", system); |
| 388 | if (rc) |
| 389 | return rc; |
| 390 | rc = check_string("sysplex_name", sysplex); |
| 391 | if (rc) |
| 392 | return rc; |
| 393 | rc = check_string("system_type", type); |
| 394 | if (rc) |
| 395 | return rc; |
| 396 | |
Michael Ernst | b1c02d9 | 2008-07-14 09:57:24 +0200 | [diff] [blame] | 397 | mutex_lock(&sclp_cpi_mutex); |
Michael Ernst | c05ffc4 | 2008-01-26 14:10:55 +0100 | [diff] [blame] | 398 | set_string(system_name, system); |
| 399 | set_string(sysplex_name, sysplex); |
| 400 | set_string(system_type, type); |
| 401 | system_level = level; |
| 402 | |
Michael Ernst | b1c02d9 | 2008-07-14 09:57:24 +0200 | [diff] [blame] | 403 | rc = cpi_req(); |
| 404 | mutex_unlock(&sclp_cpi_mutex); |
| 405 | |
| 406 | return rc; |
Michael Ernst | c05ffc4 | 2008-01-26 14:10:55 +0100 | [diff] [blame] | 407 | } |
| 408 | EXPORT_SYMBOL(sclp_cpi_set_data); |
| 409 | |
| 410 | static int __init cpi_init(void) |
| 411 | { |
| 412 | int rc; |
| 413 | |
| 414 | cpi_kset = kset_create_and_add("cpi", NULL, firmware_kobj); |
| 415 | if (!cpi_kset) |
| 416 | return -ENOMEM; |
| 417 | |
| 418 | rc = sysfs_create_group(&cpi_kset->kobj, &cpi_attr_group); |
| 419 | if (rc) |
| 420 | kset_unregister(cpi_kset); |
| 421 | |
| 422 | return rc; |
| 423 | } |
| 424 | |
| 425 | __initcall(cpi_init); |