Peter Oberparleiter | e6b6e10 | 2007-04-27 16:01:28 +0200 | [diff] [blame] | 1 | /* |
| 2 | * drivers/s390/cio/chp.c |
| 3 | * |
| 4 | * Copyright IBM Corp. 1999,2007 |
| 5 | * Author(s): Cornelia Huck (cornelia.huck@de.ibm.com) |
| 6 | * Arnd Bergmann (arndb@de.ibm.com) |
| 7 | * Peter Oberparleiter <peter.oberparleiter@de.ibm.com> |
| 8 | */ |
| 9 | |
| 10 | #include <linux/bug.h> |
| 11 | #include <linux/workqueue.h> |
| 12 | #include <linux/spinlock.h> |
Peter Oberparleiter | e5854a5 | 2007-04-27 16:01:31 +0200 | [diff] [blame] | 13 | #include <linux/init.h> |
| 14 | #include <linux/jiffies.h> |
| 15 | #include <linux/wait.h> |
| 16 | #include <linux/mutex.h> |
Cornelia Huck | a0ea22c3 | 2007-10-12 16:11:19 +0200 | [diff] [blame] | 17 | #include <linux/errno.h> |
Peter Oberparleiter | e5854a5 | 2007-04-27 16:01:31 +0200 | [diff] [blame] | 18 | #include <asm/chpid.h> |
| 19 | #include <asm/sclp.h> |
Peter Oberparleiter | e6b6e10 | 2007-04-27 16:01:28 +0200 | [diff] [blame] | 20 | |
Peter Oberparleiter | e6b6e10 | 2007-04-27 16:01:28 +0200 | [diff] [blame] | 21 | #include "cio.h" |
| 22 | #include "css.h" |
| 23 | #include "ioasm.h" |
| 24 | #include "cio_debug.h" |
| 25 | #include "chp.h" |
| 26 | |
| 27 | #define to_channelpath(device) container_of(device, struct channel_path, dev) |
Peter Oberparleiter | e5854a5 | 2007-04-27 16:01:31 +0200 | [diff] [blame] | 28 | #define CHP_INFO_UPDATE_INTERVAL 1*HZ |
| 29 | |
| 30 | enum cfg_task_t { |
| 31 | cfg_none, |
| 32 | cfg_configure, |
| 33 | cfg_deconfigure |
| 34 | }; |
| 35 | |
| 36 | /* Map for pending configure tasks. */ |
| 37 | static enum cfg_task_t chp_cfg_task[__MAX_CSSID + 1][__MAX_CHPID + 1]; |
| 38 | static DEFINE_MUTEX(cfg_lock); |
| 39 | static int cfg_busy; |
| 40 | |
| 41 | /* Map for channel-path status. */ |
| 42 | static struct sclp_chp_info chp_info; |
| 43 | static DEFINE_MUTEX(info_lock); |
| 44 | |
| 45 | /* Time after which channel-path status may be outdated. */ |
| 46 | static unsigned long chp_info_expires; |
| 47 | |
| 48 | /* Workqueue to perform pending configure tasks. */ |
| 49 | static struct workqueue_struct *chp_wq; |
| 50 | static struct work_struct cfg_work; |
| 51 | |
| 52 | /* Wait queue for configure completion events. */ |
| 53 | static wait_queue_head_t cfg_wait_queue; |
Peter Oberparleiter | e6b6e10 | 2007-04-27 16:01:28 +0200 | [diff] [blame] | 54 | |
| 55 | /* Return channel_path struct for given chpid. */ |
| 56 | static inline struct channel_path *chpid_to_chp(struct chp_id chpid) |
| 57 | { |
Cornelia Huck | 7c9f4e3 | 2007-10-12 16:11:13 +0200 | [diff] [blame] | 58 | return channel_subsystems[chpid.cssid]->chps[chpid.id]; |
Peter Oberparleiter | e6b6e10 | 2007-04-27 16:01:28 +0200 | [diff] [blame] | 59 | } |
| 60 | |
| 61 | /* Set vary state for given chpid. */ |
| 62 | static void set_chp_logically_online(struct chp_id chpid, int onoff) |
| 63 | { |
| 64 | chpid_to_chp(chpid)->state = onoff; |
| 65 | } |
| 66 | |
| 67 | /* On succes return 0 if channel-path is varied offline, 1 if it is varied |
| 68 | * online. Return -ENODEV if channel-path is not registered. */ |
| 69 | int chp_get_status(struct chp_id chpid) |
| 70 | { |
| 71 | return (chpid_to_chp(chpid) ? chpid_to_chp(chpid)->state : -ENODEV); |
| 72 | } |
| 73 | |
| 74 | /** |
| 75 | * chp_get_sch_opm - return opm for subchannel |
| 76 | * @sch: subchannel |
| 77 | * |
| 78 | * Calculate and return the operational path mask (opm) based on the chpids |
| 79 | * used by the subchannel and the status of the associated channel-paths. |
| 80 | */ |
| 81 | u8 chp_get_sch_opm(struct subchannel *sch) |
| 82 | { |
| 83 | struct chp_id chpid; |
| 84 | int opm; |
| 85 | int i; |
| 86 | |
| 87 | opm = 0; |
| 88 | chp_id_init(&chpid); |
Cornelia Huck | a0ea22c3 | 2007-10-12 16:11:19 +0200 | [diff] [blame] | 89 | for (i = 0; i < 8; i++) { |
Peter Oberparleiter | e6b6e10 | 2007-04-27 16:01:28 +0200 | [diff] [blame] | 90 | opm <<= 1; |
| 91 | chpid.id = sch->schib.pmcw.chpid[i]; |
| 92 | if (chp_get_status(chpid) != 0) |
| 93 | opm |= 1; |
| 94 | } |
| 95 | return opm; |
| 96 | } |
| 97 | |
| 98 | /** |
| 99 | * chp_is_registered - check if a channel-path is registered |
| 100 | * @chpid: channel-path ID |
| 101 | * |
| 102 | * Return non-zero if a channel-path with the given chpid is registered, |
| 103 | * zero otherwise. |
| 104 | */ |
| 105 | int chp_is_registered(struct chp_id chpid) |
| 106 | { |
| 107 | return chpid_to_chp(chpid) != NULL; |
| 108 | } |
| 109 | |
| 110 | /* |
| 111 | * Function: s390_vary_chpid |
| 112 | * Varies the specified chpid online or offline |
| 113 | */ |
| 114 | static int s390_vary_chpid(struct chp_id chpid, int on) |
| 115 | { |
| 116 | char dbf_text[15]; |
| 117 | int status; |
| 118 | |
| 119 | sprintf(dbf_text, on?"varyon%x.%02x":"varyoff%x.%02x", chpid.cssid, |
| 120 | chpid.id); |
Cornelia Huck | a0ea22c3 | 2007-10-12 16:11:19 +0200 | [diff] [blame] | 121 | CIO_TRACE_EVENT(2, dbf_text); |
Peter Oberparleiter | e6b6e10 | 2007-04-27 16:01:28 +0200 | [diff] [blame] | 122 | |
| 123 | status = chp_get_status(chpid); |
Peter Oberparleiter | e6b6e10 | 2007-04-27 16:01:28 +0200 | [diff] [blame] | 124 | if (!on && !status) { |
Cornelia Huck | e556bbb | 2007-07-27 12:29:19 +0200 | [diff] [blame] | 125 | printk(KERN_ERR "cio: chpid %x.%02x is already offline\n", |
Peter Oberparleiter | e6b6e10 | 2007-04-27 16:01:28 +0200 | [diff] [blame] | 126 | chpid.cssid, chpid.id); |
| 127 | return -EINVAL; |
| 128 | } |
| 129 | |
| 130 | set_chp_logically_online(chpid, on); |
| 131 | chsc_chp_vary(chpid, on); |
| 132 | return 0; |
| 133 | } |
| 134 | |
| 135 | /* |
| 136 | * Channel measurement related functions |
| 137 | */ |
Zhang Rui | 91a6902 | 2007-06-09 13:57:22 +0800 | [diff] [blame] | 138 | static ssize_t chp_measurement_chars_read(struct kobject *kobj, |
| 139 | struct bin_attribute *bin_attr, |
| 140 | char *buf, loff_t off, size_t count) |
Peter Oberparleiter | e6b6e10 | 2007-04-27 16:01:28 +0200 | [diff] [blame] | 141 | { |
| 142 | struct channel_path *chp; |
Heiko Carstens | 364c855 | 2007-10-12 16:11:35 +0200 | [diff] [blame] | 143 | struct device *device; |
Peter Oberparleiter | e6b6e10 | 2007-04-27 16:01:28 +0200 | [diff] [blame] | 144 | unsigned int size; |
| 145 | |
Heiko Carstens | 364c855 | 2007-10-12 16:11:35 +0200 | [diff] [blame] | 146 | device = container_of(kobj, struct device, kobj); |
| 147 | chp = to_channelpath(device); |
Peter Oberparleiter | e6b6e10 | 2007-04-27 16:01:28 +0200 | [diff] [blame] | 148 | if (!chp->cmg_chars) |
| 149 | return 0; |
| 150 | |
| 151 | size = sizeof(struct cmg_chars); |
| 152 | |
| 153 | if (off > size) |
| 154 | return 0; |
| 155 | if (off + count > size) |
| 156 | count = size - off; |
| 157 | memcpy(buf, chp->cmg_chars + off, count); |
| 158 | return count; |
| 159 | } |
| 160 | |
| 161 | static struct bin_attribute chp_measurement_chars_attr = { |
| 162 | .attr = { |
| 163 | .name = "measurement_chars", |
| 164 | .mode = S_IRUSR, |
Peter Oberparleiter | e6b6e10 | 2007-04-27 16:01:28 +0200 | [diff] [blame] | 165 | }, |
| 166 | .size = sizeof(struct cmg_chars), |
| 167 | .read = chp_measurement_chars_read, |
| 168 | }; |
| 169 | |
| 170 | static void chp_measurement_copy_block(struct cmg_entry *buf, |
| 171 | struct channel_subsystem *css, |
| 172 | struct chp_id chpid) |
| 173 | { |
| 174 | void *area; |
| 175 | struct cmg_entry *entry, reference_buf; |
| 176 | int idx; |
| 177 | |
| 178 | if (chpid.id < 128) { |
| 179 | area = css->cub_addr1; |
| 180 | idx = chpid.id; |
| 181 | } else { |
| 182 | area = css->cub_addr2; |
| 183 | idx = chpid.id - 128; |
| 184 | } |
| 185 | entry = area + (idx * sizeof(struct cmg_entry)); |
| 186 | do { |
| 187 | memcpy(buf, entry, sizeof(*entry)); |
| 188 | memcpy(&reference_buf, entry, sizeof(*entry)); |
| 189 | } while (reference_buf.values[0] != buf->values[0]); |
| 190 | } |
| 191 | |
Zhang Rui | 91a6902 | 2007-06-09 13:57:22 +0800 | [diff] [blame] | 192 | static ssize_t chp_measurement_read(struct kobject *kobj, |
| 193 | struct bin_attribute *bin_attr, |
| 194 | char *buf, loff_t off, size_t count) |
Peter Oberparleiter | e6b6e10 | 2007-04-27 16:01:28 +0200 | [diff] [blame] | 195 | { |
| 196 | struct channel_path *chp; |
| 197 | struct channel_subsystem *css; |
Heiko Carstens | 364c855 | 2007-10-12 16:11:35 +0200 | [diff] [blame] | 198 | struct device *device; |
Peter Oberparleiter | e6b6e10 | 2007-04-27 16:01:28 +0200 | [diff] [blame] | 199 | unsigned int size; |
| 200 | |
Heiko Carstens | 364c855 | 2007-10-12 16:11:35 +0200 | [diff] [blame] | 201 | device = container_of(kobj, struct device, kobj); |
| 202 | chp = to_channelpath(device); |
Peter Oberparleiter | e6b6e10 | 2007-04-27 16:01:28 +0200 | [diff] [blame] | 203 | css = to_css(chp->dev.parent); |
| 204 | |
| 205 | size = sizeof(struct cmg_entry); |
| 206 | |
| 207 | /* Only allow single reads. */ |
| 208 | if (off || count < size) |
| 209 | return 0; |
| 210 | chp_measurement_copy_block((struct cmg_entry *)buf, css, chp->chpid); |
| 211 | count = size; |
| 212 | return count; |
| 213 | } |
| 214 | |
| 215 | static struct bin_attribute chp_measurement_attr = { |
| 216 | .attr = { |
| 217 | .name = "measurement", |
| 218 | .mode = S_IRUSR, |
Peter Oberparleiter | e6b6e10 | 2007-04-27 16:01:28 +0200 | [diff] [blame] | 219 | }, |
| 220 | .size = sizeof(struct cmg_entry), |
| 221 | .read = chp_measurement_read, |
| 222 | }; |
| 223 | |
| 224 | void chp_remove_cmg_attr(struct channel_path *chp) |
| 225 | { |
| 226 | device_remove_bin_file(&chp->dev, &chp_measurement_chars_attr); |
| 227 | device_remove_bin_file(&chp->dev, &chp_measurement_attr); |
| 228 | } |
| 229 | |
| 230 | int chp_add_cmg_attr(struct channel_path *chp) |
| 231 | { |
| 232 | int ret; |
| 233 | |
| 234 | ret = device_create_bin_file(&chp->dev, &chp_measurement_chars_attr); |
| 235 | if (ret) |
| 236 | return ret; |
| 237 | ret = device_create_bin_file(&chp->dev, &chp_measurement_attr); |
| 238 | if (ret) |
| 239 | device_remove_bin_file(&chp->dev, &chp_measurement_chars_attr); |
| 240 | return ret; |
| 241 | } |
| 242 | |
| 243 | /* |
| 244 | * Files for the channel path entries. |
| 245 | */ |
| 246 | static ssize_t chp_status_show(struct device *dev, |
| 247 | struct device_attribute *attr, char *buf) |
| 248 | { |
Cornelia Huck | 0546960 | 2007-10-22 12:52:40 +0200 | [diff] [blame^] | 249 | struct channel_path *chp = to_channelpath(dev); |
Peter Oberparleiter | e6b6e10 | 2007-04-27 16:01:28 +0200 | [diff] [blame] | 250 | |
| 251 | if (!chp) |
| 252 | return 0; |
| 253 | return (chp_get_status(chp->chpid) ? sprintf(buf, "online\n") : |
| 254 | sprintf(buf, "offline\n")); |
| 255 | } |
| 256 | |
| 257 | static ssize_t chp_status_write(struct device *dev, |
| 258 | struct device_attribute *attr, |
| 259 | const char *buf, size_t count) |
| 260 | { |
Cornelia Huck | 0546960 | 2007-10-22 12:52:40 +0200 | [diff] [blame^] | 261 | struct channel_path *cp = to_channelpath(dev); |
Peter Oberparleiter | e6b6e10 | 2007-04-27 16:01:28 +0200 | [diff] [blame] | 262 | char cmd[10]; |
| 263 | int num_args; |
| 264 | int error; |
| 265 | |
| 266 | num_args = sscanf(buf, "%5s", cmd); |
| 267 | if (!num_args) |
| 268 | return count; |
| 269 | |
| 270 | if (!strnicmp(cmd, "on", 2) || !strcmp(cmd, "1")) |
| 271 | error = s390_vary_chpid(cp->chpid, 1); |
| 272 | else if (!strnicmp(cmd, "off", 3) || !strcmp(cmd, "0")) |
| 273 | error = s390_vary_chpid(cp->chpid, 0); |
| 274 | else |
| 275 | error = -EINVAL; |
| 276 | |
| 277 | return error < 0 ? error : count; |
| 278 | |
| 279 | } |
| 280 | |
| 281 | static DEVICE_ATTR(status, 0644, chp_status_show, chp_status_write); |
| 282 | |
Peter Oberparleiter | e5854a5 | 2007-04-27 16:01:31 +0200 | [diff] [blame] | 283 | static ssize_t chp_configure_show(struct device *dev, |
| 284 | struct device_attribute *attr, char *buf) |
| 285 | { |
| 286 | struct channel_path *cp; |
| 287 | int status; |
| 288 | |
Cornelia Huck | 0546960 | 2007-10-22 12:52:40 +0200 | [diff] [blame^] | 289 | cp = to_channelpath(dev); |
Peter Oberparleiter | e5854a5 | 2007-04-27 16:01:31 +0200 | [diff] [blame] | 290 | status = chp_info_get_status(cp->chpid); |
| 291 | if (status < 0) |
| 292 | return status; |
| 293 | |
| 294 | return snprintf(buf, PAGE_SIZE, "%d\n", status); |
| 295 | } |
| 296 | |
| 297 | static int cfg_wait_idle(void); |
| 298 | |
| 299 | static ssize_t chp_configure_write(struct device *dev, |
| 300 | struct device_attribute *attr, |
| 301 | const char *buf, size_t count) |
| 302 | { |
| 303 | struct channel_path *cp; |
| 304 | int val; |
| 305 | char delim; |
| 306 | |
| 307 | if (sscanf(buf, "%d %c", &val, &delim) != 1) |
| 308 | return -EINVAL; |
| 309 | if (val != 0 && val != 1) |
| 310 | return -EINVAL; |
Cornelia Huck | 0546960 | 2007-10-22 12:52:40 +0200 | [diff] [blame^] | 311 | cp = to_channelpath(dev); |
Peter Oberparleiter | e5854a5 | 2007-04-27 16:01:31 +0200 | [diff] [blame] | 312 | chp_cfg_schedule(cp->chpid, val); |
| 313 | cfg_wait_idle(); |
| 314 | |
| 315 | return count; |
| 316 | } |
| 317 | |
| 318 | static DEVICE_ATTR(configure, 0644, chp_configure_show, chp_configure_write); |
| 319 | |
Peter Oberparleiter | e6b6e10 | 2007-04-27 16:01:28 +0200 | [diff] [blame] | 320 | static ssize_t chp_type_show(struct device *dev, struct device_attribute *attr, |
| 321 | char *buf) |
| 322 | { |
Cornelia Huck | 0546960 | 2007-10-22 12:52:40 +0200 | [diff] [blame^] | 323 | struct channel_path *chp = to_channelpath(dev); |
Peter Oberparleiter | e6b6e10 | 2007-04-27 16:01:28 +0200 | [diff] [blame] | 324 | |
| 325 | if (!chp) |
| 326 | return 0; |
| 327 | return sprintf(buf, "%x\n", chp->desc.desc); |
| 328 | } |
| 329 | |
| 330 | static DEVICE_ATTR(type, 0444, chp_type_show, NULL); |
| 331 | |
| 332 | static ssize_t chp_cmg_show(struct device *dev, struct device_attribute *attr, |
| 333 | char *buf) |
| 334 | { |
| 335 | struct channel_path *chp = to_channelpath(dev); |
| 336 | |
| 337 | if (!chp) |
| 338 | return 0; |
| 339 | if (chp->cmg == -1) /* channel measurements not available */ |
| 340 | return sprintf(buf, "unknown\n"); |
| 341 | return sprintf(buf, "%x\n", chp->cmg); |
| 342 | } |
| 343 | |
| 344 | static DEVICE_ATTR(cmg, 0444, chp_cmg_show, NULL); |
| 345 | |
| 346 | static ssize_t chp_shared_show(struct device *dev, |
| 347 | struct device_attribute *attr, char *buf) |
| 348 | { |
| 349 | struct channel_path *chp = to_channelpath(dev); |
| 350 | |
| 351 | if (!chp) |
| 352 | return 0; |
| 353 | if (chp->shared == -1) /* channel measurements not available */ |
| 354 | return sprintf(buf, "unknown\n"); |
| 355 | return sprintf(buf, "%x\n", chp->shared); |
| 356 | } |
| 357 | |
| 358 | static DEVICE_ATTR(shared, 0444, chp_shared_show, NULL); |
| 359 | |
Cornelia Huck | a0ea22c3 | 2007-10-12 16:11:19 +0200 | [diff] [blame] | 360 | static struct attribute *chp_attrs[] = { |
Peter Oberparleiter | e6b6e10 | 2007-04-27 16:01:28 +0200 | [diff] [blame] | 361 | &dev_attr_status.attr, |
Peter Oberparleiter | e5854a5 | 2007-04-27 16:01:31 +0200 | [diff] [blame] | 362 | &dev_attr_configure.attr, |
Peter Oberparleiter | e6b6e10 | 2007-04-27 16:01:28 +0200 | [diff] [blame] | 363 | &dev_attr_type.attr, |
| 364 | &dev_attr_cmg.attr, |
| 365 | &dev_attr_shared.attr, |
| 366 | NULL, |
| 367 | }; |
| 368 | |
| 369 | static struct attribute_group chp_attr_group = { |
| 370 | .attrs = chp_attrs, |
| 371 | }; |
| 372 | |
| 373 | static void chp_release(struct device *dev) |
| 374 | { |
| 375 | struct channel_path *cp; |
| 376 | |
Cornelia Huck | 0546960 | 2007-10-22 12:52:40 +0200 | [diff] [blame^] | 377 | cp = to_channelpath(dev); |
Peter Oberparleiter | e6b6e10 | 2007-04-27 16:01:28 +0200 | [diff] [blame] | 378 | kfree(cp); |
| 379 | } |
| 380 | |
| 381 | /** |
| 382 | * chp_new - register a new channel-path |
| 383 | * @chpid - channel-path ID |
| 384 | * |
| 385 | * Create and register data structure representing new channel-path. Return |
| 386 | * zero on success, non-zero otherwise. |
| 387 | */ |
| 388 | int chp_new(struct chp_id chpid) |
| 389 | { |
| 390 | struct channel_path *chp; |
| 391 | int ret; |
| 392 | |
Peter Oberparleiter | e5854a5 | 2007-04-27 16:01:31 +0200 | [diff] [blame] | 393 | if (chp_is_registered(chpid)) |
| 394 | return 0; |
Peter Oberparleiter | e6b6e10 | 2007-04-27 16:01:28 +0200 | [diff] [blame] | 395 | chp = kzalloc(sizeof(struct channel_path), GFP_KERNEL); |
| 396 | if (!chp) |
| 397 | return -ENOMEM; |
| 398 | |
| 399 | /* fill in status, etc. */ |
| 400 | chp->chpid = chpid; |
| 401 | chp->state = 1; |
Cornelia Huck | 7c9f4e3 | 2007-10-12 16:11:13 +0200 | [diff] [blame] | 402 | chp->dev.parent = &channel_subsystems[chpid.cssid]->device; |
Peter Oberparleiter | e6b6e10 | 2007-04-27 16:01:28 +0200 | [diff] [blame] | 403 | chp->dev.release = chp_release; |
| 404 | snprintf(chp->dev.bus_id, BUS_ID_SIZE, "chp%x.%02x", chpid.cssid, |
| 405 | chpid.id); |
| 406 | |
| 407 | /* Obtain channel path description and fill it in. */ |
| 408 | ret = chsc_determine_channel_path_description(chpid, &chp->desc); |
| 409 | if (ret) |
| 410 | goto out_free; |
Peter Oberparleiter | c9182e0 | 2007-04-27 16:01:29 +0200 | [diff] [blame] | 411 | if ((chp->desc.flags & 0x80) == 0) { |
| 412 | ret = -ENODEV; |
| 413 | goto out_free; |
| 414 | } |
Peter Oberparleiter | e6b6e10 | 2007-04-27 16:01:28 +0200 | [diff] [blame] | 415 | /* Get channel-measurement characteristics. */ |
| 416 | if (css_characteristics_avail && css_chsc_characteristics.scmc |
| 417 | && css_chsc_characteristics.secm) { |
| 418 | ret = chsc_get_channel_measurement_chars(chp); |
| 419 | if (ret) |
| 420 | goto out_free; |
| 421 | } else { |
Peter Oberparleiter | e6b6e10 | 2007-04-27 16:01:28 +0200 | [diff] [blame] | 422 | chp->cmg = -1; |
| 423 | } |
| 424 | |
| 425 | /* make it known to the system */ |
| 426 | ret = device_register(&chp->dev); |
| 427 | if (ret) { |
Cornelia Huck | e556bbb | 2007-07-27 12:29:19 +0200 | [diff] [blame] | 428 | CIO_MSG_EVENT(0, "Could not register chp%x.%02x: %d\n", |
| 429 | chpid.cssid, chpid.id, ret); |
Peter Oberparleiter | e6b6e10 | 2007-04-27 16:01:28 +0200 | [diff] [blame] | 430 | goto out_free; |
| 431 | } |
| 432 | ret = sysfs_create_group(&chp->dev.kobj, &chp_attr_group); |
| 433 | if (ret) { |
| 434 | device_unregister(&chp->dev); |
| 435 | goto out_free; |
| 436 | } |
Cornelia Huck | 7c9f4e3 | 2007-10-12 16:11:13 +0200 | [diff] [blame] | 437 | mutex_lock(&channel_subsystems[chpid.cssid]->mutex); |
| 438 | if (channel_subsystems[chpid.cssid]->cm_enabled) { |
Peter Oberparleiter | e6b6e10 | 2007-04-27 16:01:28 +0200 | [diff] [blame] | 439 | ret = chp_add_cmg_attr(chp); |
| 440 | if (ret) { |
| 441 | sysfs_remove_group(&chp->dev.kobj, &chp_attr_group); |
| 442 | device_unregister(&chp->dev); |
Cornelia Huck | 7c9f4e3 | 2007-10-12 16:11:13 +0200 | [diff] [blame] | 443 | mutex_unlock(&channel_subsystems[chpid.cssid]->mutex); |
Peter Oberparleiter | e6b6e10 | 2007-04-27 16:01:28 +0200 | [diff] [blame] | 444 | goto out_free; |
| 445 | } |
| 446 | } |
Cornelia Huck | 7c9f4e3 | 2007-10-12 16:11:13 +0200 | [diff] [blame] | 447 | channel_subsystems[chpid.cssid]->chps[chpid.id] = chp; |
| 448 | mutex_unlock(&channel_subsystems[chpid.cssid]->mutex); |
Peter Oberparleiter | e6b6e10 | 2007-04-27 16:01:28 +0200 | [diff] [blame] | 449 | return ret; |
| 450 | out_free: |
| 451 | kfree(chp); |
| 452 | return ret; |
| 453 | } |
| 454 | |
| 455 | /** |
| 456 | * chp_get_chp_desc - return newly allocated channel-path description |
| 457 | * @chpid: channel-path ID |
| 458 | * |
| 459 | * On success return a newly allocated copy of the channel-path description |
| 460 | * data associated with the given channel-path ID. Return %NULL on error. |
| 461 | */ |
| 462 | void *chp_get_chp_desc(struct chp_id chpid) |
| 463 | { |
| 464 | struct channel_path *chp; |
| 465 | struct channel_path_desc *desc; |
| 466 | |
| 467 | chp = chpid_to_chp(chpid); |
| 468 | if (!chp) |
| 469 | return NULL; |
| 470 | desc = kmalloc(sizeof(struct channel_path_desc), GFP_KERNEL); |
| 471 | if (!desc) |
| 472 | return NULL; |
| 473 | memcpy(desc, &chp->desc, sizeof(struct channel_path_desc)); |
| 474 | return desc; |
| 475 | } |
| 476 | |
| 477 | /** |
| 478 | * chp_process_crw - process channel-path status change |
| 479 | * @id: channel-path ID number |
| 480 | * @status: non-zero if channel-path has become available, zero otherwise |
| 481 | * |
| 482 | * Handle channel-report-words indicating that the status of a channel-path |
| 483 | * has changed. |
| 484 | */ |
Peter Oberparleiter | 83b3370 | 2007-04-27 16:01:34 +0200 | [diff] [blame] | 485 | void chp_process_crw(int id, int status) |
Peter Oberparleiter | e6b6e10 | 2007-04-27 16:01:28 +0200 | [diff] [blame] | 486 | { |
| 487 | struct chp_id chpid; |
| 488 | |
| 489 | chp_id_init(&chpid); |
| 490 | chpid.id = id; |
| 491 | if (status) { |
| 492 | if (!chp_is_registered(chpid)) |
| 493 | chp_new(chpid); |
Peter Oberparleiter | 83b3370 | 2007-04-27 16:01:34 +0200 | [diff] [blame] | 494 | chsc_chp_online(chpid); |
| 495 | } else |
Peter Oberparleiter | e6b6e10 | 2007-04-27 16:01:28 +0200 | [diff] [blame] | 496 | chsc_chp_offline(chpid); |
Peter Oberparleiter | e6b6e10 | 2007-04-27 16:01:28 +0200 | [diff] [blame] | 497 | } |
Peter Oberparleiter | e5854a5 | 2007-04-27 16:01:31 +0200 | [diff] [blame] | 498 | |
| 499 | static inline int info_bit_num(struct chp_id id) |
| 500 | { |
| 501 | return id.id + id.cssid * (__MAX_CHPID + 1); |
| 502 | } |
| 503 | |
| 504 | /* Force chp_info refresh on next call to info_validate(). */ |
| 505 | static void info_expire(void) |
| 506 | { |
| 507 | mutex_lock(&info_lock); |
| 508 | chp_info_expires = jiffies - 1; |
| 509 | mutex_unlock(&info_lock); |
| 510 | } |
| 511 | |
| 512 | /* Ensure that chp_info is up-to-date. */ |
| 513 | static int info_update(void) |
| 514 | { |
| 515 | int rc; |
| 516 | |
| 517 | mutex_lock(&info_lock); |
| 518 | rc = 0; |
| 519 | if (time_after(jiffies, chp_info_expires)) { |
| 520 | /* Data is too old, update. */ |
| 521 | rc = sclp_chp_read_info(&chp_info); |
| 522 | chp_info_expires = jiffies + CHP_INFO_UPDATE_INTERVAL ; |
| 523 | } |
| 524 | mutex_unlock(&info_lock); |
| 525 | |
| 526 | return rc; |
| 527 | } |
| 528 | |
| 529 | /** |
| 530 | * chp_info_get_status - retrieve configure status of a channel-path |
| 531 | * @chpid: channel-path ID |
| 532 | * |
| 533 | * On success, return 0 for standby, 1 for configured, 2 for reserved, |
| 534 | * 3 for not recognized. Return negative error code on error. |
| 535 | */ |
| 536 | int chp_info_get_status(struct chp_id chpid) |
| 537 | { |
| 538 | int rc; |
| 539 | int bit; |
| 540 | |
| 541 | rc = info_update(); |
| 542 | if (rc) |
| 543 | return rc; |
| 544 | |
| 545 | bit = info_bit_num(chpid); |
| 546 | mutex_lock(&info_lock); |
| 547 | if (!chp_test_bit(chp_info.recognized, bit)) |
| 548 | rc = CHP_STATUS_NOT_RECOGNIZED; |
| 549 | else if (chp_test_bit(chp_info.configured, bit)) |
| 550 | rc = CHP_STATUS_CONFIGURED; |
| 551 | else if (chp_test_bit(chp_info.standby, bit)) |
| 552 | rc = CHP_STATUS_STANDBY; |
| 553 | else |
| 554 | rc = CHP_STATUS_RESERVED; |
| 555 | mutex_unlock(&info_lock); |
| 556 | |
| 557 | return rc; |
| 558 | } |
| 559 | |
| 560 | /* Return configure task for chpid. */ |
| 561 | static enum cfg_task_t cfg_get_task(struct chp_id chpid) |
| 562 | { |
| 563 | return chp_cfg_task[chpid.cssid][chpid.id]; |
| 564 | } |
| 565 | |
| 566 | /* Set configure task for chpid. */ |
| 567 | static void cfg_set_task(struct chp_id chpid, enum cfg_task_t cfg) |
| 568 | { |
| 569 | chp_cfg_task[chpid.cssid][chpid.id] = cfg; |
| 570 | } |
| 571 | |
| 572 | /* Perform one configure/deconfigure request. Reschedule work function until |
| 573 | * last request. */ |
| 574 | static void cfg_func(struct work_struct *work) |
| 575 | { |
| 576 | struct chp_id chpid; |
| 577 | enum cfg_task_t t; |
| 578 | |
| 579 | mutex_lock(&cfg_lock); |
| 580 | t = cfg_none; |
| 581 | chp_id_for_each(&chpid) { |
| 582 | t = cfg_get_task(chpid); |
| 583 | if (t != cfg_none) { |
| 584 | cfg_set_task(chpid, cfg_none); |
| 585 | break; |
| 586 | } |
| 587 | } |
| 588 | mutex_unlock(&cfg_lock); |
| 589 | |
| 590 | switch (t) { |
| 591 | case cfg_configure: |
| 592 | sclp_chp_configure(chpid); |
| 593 | info_expire(); |
| 594 | chsc_chp_online(chpid); |
| 595 | break; |
| 596 | case cfg_deconfigure: |
| 597 | sclp_chp_deconfigure(chpid); |
| 598 | info_expire(); |
| 599 | chsc_chp_offline(chpid); |
| 600 | break; |
| 601 | case cfg_none: |
| 602 | /* Get updated information after last change. */ |
| 603 | info_update(); |
| 604 | mutex_lock(&cfg_lock); |
| 605 | cfg_busy = 0; |
| 606 | mutex_unlock(&cfg_lock); |
| 607 | wake_up_interruptible(&cfg_wait_queue); |
| 608 | return; |
| 609 | } |
| 610 | queue_work(chp_wq, &cfg_work); |
| 611 | } |
| 612 | |
| 613 | /** |
| 614 | * chp_cfg_schedule - schedule chpid configuration request |
| 615 | * @chpid - channel-path ID |
| 616 | * @configure - Non-zero for configure, zero for deconfigure |
| 617 | * |
| 618 | * Schedule a channel-path configuration/deconfiguration request. |
| 619 | */ |
| 620 | void chp_cfg_schedule(struct chp_id chpid, int configure) |
| 621 | { |
| 622 | CIO_MSG_EVENT(2, "chp_cfg_sched%x.%02x=%d\n", chpid.cssid, chpid.id, |
| 623 | configure); |
| 624 | mutex_lock(&cfg_lock); |
| 625 | cfg_set_task(chpid, configure ? cfg_configure : cfg_deconfigure); |
| 626 | cfg_busy = 1; |
| 627 | mutex_unlock(&cfg_lock); |
| 628 | queue_work(chp_wq, &cfg_work); |
| 629 | } |
| 630 | |
| 631 | /** |
| 632 | * chp_cfg_cancel_deconfigure - cancel chpid deconfiguration request |
| 633 | * @chpid - channel-path ID |
| 634 | * |
| 635 | * Cancel an active channel-path deconfiguration request if it has not yet |
| 636 | * been performed. |
| 637 | */ |
| 638 | void chp_cfg_cancel_deconfigure(struct chp_id chpid) |
| 639 | { |
| 640 | CIO_MSG_EVENT(2, "chp_cfg_cancel:%x.%02x\n", chpid.cssid, chpid.id); |
| 641 | mutex_lock(&cfg_lock); |
| 642 | if (cfg_get_task(chpid) == cfg_deconfigure) |
| 643 | cfg_set_task(chpid, cfg_none); |
| 644 | mutex_unlock(&cfg_lock); |
| 645 | } |
| 646 | |
| 647 | static int cfg_wait_idle(void) |
| 648 | { |
| 649 | if (wait_event_interruptible(cfg_wait_queue, !cfg_busy)) |
| 650 | return -ERESTARTSYS; |
| 651 | return 0; |
| 652 | } |
| 653 | |
| 654 | static int __init chp_init(void) |
| 655 | { |
| 656 | struct chp_id chpid; |
| 657 | |
| 658 | chp_wq = create_singlethread_workqueue("cio_chp"); |
| 659 | if (!chp_wq) |
| 660 | return -ENOMEM; |
| 661 | INIT_WORK(&cfg_work, cfg_func); |
| 662 | init_waitqueue_head(&cfg_wait_queue); |
| 663 | if (info_update()) |
| 664 | return 0; |
| 665 | /* Register available channel-paths. */ |
| 666 | chp_id_for_each(&chpid) { |
| 667 | if (chp_info_get_status(chpid) != CHP_STATUS_NOT_RECOGNIZED) |
| 668 | chp_new(chpid); |
| 669 | } |
| 670 | |
| 671 | return 0; |
| 672 | } |
| 673 | |
| 674 | subsys_initcall(chp_init); |