Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * drivers/s390/cio/css.c |
| 3 | * driver for channel subsystem |
| 4 | * $Revision: 1.85 $ |
| 5 | * |
| 6 | * Copyright (C) 2002 IBM Deutschland Entwicklung GmbH, |
| 7 | * IBM Corporation |
| 8 | * Author(s): Arnd Bergmann (arndb@de.ibm.com) |
| 9 | * Cornelia Huck (cohuck@de.ibm.com) |
| 10 | */ |
| 11 | #include <linux/module.h> |
| 12 | #include <linux/init.h> |
| 13 | #include <linux/device.h> |
| 14 | #include <linux/slab.h> |
| 15 | #include <linux/errno.h> |
| 16 | #include <linux/list.h> |
| 17 | |
| 18 | #include "css.h" |
| 19 | #include "cio.h" |
| 20 | #include "cio_debug.h" |
| 21 | #include "ioasm.h" |
| 22 | #include "chsc.h" |
| 23 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | int need_rescan = 0; |
| 25 | int css_init_done = 0; |
| 26 | |
Cornelia Huck | a28c694 | 2006-01-06 00:19:23 -0800 | [diff] [blame^] | 27 | struct channel_subsystem *css[__MAX_CSSID + 1]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | |
Cornelia Huck | a28c694 | 2006-01-06 00:19:23 -0800 | [diff] [blame^] | 29 | int css_characteristics_avail = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | |
Cornelia Huck | f97a56f | 2006-01-06 00:19:22 -0800 | [diff] [blame] | 31 | inline int |
| 32 | for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *data) |
| 33 | { |
| 34 | struct subchannel_id schid; |
| 35 | int ret; |
| 36 | |
| 37 | init_subchannel_id(&schid); |
| 38 | ret = -ENODEV; |
| 39 | do { |
| 40 | ret = fn(schid, data); |
| 41 | if (ret) |
| 42 | break; |
| 43 | } while (schid.sch_no++ < __MAX_SUBCHANNEL); |
| 44 | return ret; |
| 45 | } |
| 46 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | static struct subchannel * |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 48 | css_alloc_subchannel(struct subchannel_id schid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | { |
| 50 | struct subchannel *sch; |
| 51 | int ret; |
| 52 | |
| 53 | sch = kmalloc (sizeof (*sch), GFP_KERNEL | GFP_DMA); |
| 54 | if (sch == NULL) |
| 55 | return ERR_PTR(-ENOMEM); |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 56 | ret = cio_validate_subchannel (sch, schid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | if (ret < 0) { |
| 58 | kfree(sch); |
| 59 | return ERR_PTR(ret); |
| 60 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | |
| 62 | if (sch->st != SUBCHANNEL_TYPE_IO) { |
| 63 | /* For now we ignore all non-io subchannels. */ |
| 64 | kfree(sch); |
| 65 | return ERR_PTR(-EINVAL); |
| 66 | } |
| 67 | |
| 68 | /* |
| 69 | * Set intparm to subchannel address. |
| 70 | * This is fine even on 64bit since the subchannel is always located |
| 71 | * under 2G. |
| 72 | */ |
| 73 | sch->schib.pmcw.intparm = (__u32)(unsigned long)sch; |
| 74 | ret = cio_modify(sch); |
| 75 | if (ret) { |
| 76 | kfree(sch); |
| 77 | return ERR_PTR(ret); |
| 78 | } |
| 79 | return sch; |
| 80 | } |
| 81 | |
| 82 | static void |
| 83 | css_free_subchannel(struct subchannel *sch) |
| 84 | { |
| 85 | if (sch) { |
| 86 | /* Reset intparm to zeroes. */ |
| 87 | sch->schib.pmcw.intparm = 0; |
| 88 | cio_modify(sch); |
| 89 | kfree(sch); |
| 90 | } |
| 91 | |
| 92 | } |
| 93 | |
| 94 | static void |
| 95 | css_subchannel_release(struct device *dev) |
| 96 | { |
| 97 | struct subchannel *sch; |
| 98 | |
| 99 | sch = to_subchannel(dev); |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 100 | if (!cio_is_console(sch->schid)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | kfree(sch); |
| 102 | } |
| 103 | |
| 104 | extern int css_get_ssd_info(struct subchannel *sch); |
| 105 | |
| 106 | static int |
| 107 | css_register_subchannel(struct subchannel *sch) |
| 108 | { |
| 109 | int ret; |
| 110 | |
| 111 | /* Initialize the subchannel structure */ |
Cornelia Huck | a28c694 | 2006-01-06 00:19:23 -0800 | [diff] [blame^] | 112 | sch->dev.parent = &css[0]->device; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | sch->dev.bus = &css_bus_type; |
| 114 | sch->dev.release = &css_subchannel_release; |
| 115 | |
| 116 | /* make it known to the system */ |
| 117 | ret = device_register(&sch->dev); |
| 118 | if (ret) |
| 119 | printk (KERN_WARNING "%s: could not register %s\n", |
| 120 | __func__, sch->dev.bus_id); |
| 121 | else |
| 122 | css_get_ssd_info(sch); |
| 123 | return ret; |
| 124 | } |
| 125 | |
| 126 | int |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 127 | css_probe_device(struct subchannel_id schid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | { |
| 129 | int ret; |
| 130 | struct subchannel *sch; |
| 131 | |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 132 | sch = css_alloc_subchannel(schid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | if (IS_ERR(sch)) |
| 134 | return PTR_ERR(sch); |
| 135 | ret = css_register_subchannel(sch); |
| 136 | if (ret) |
| 137 | css_free_subchannel(sch); |
| 138 | return ret; |
| 139 | } |
| 140 | |
Cornelia Huck | b0744bd | 2005-06-25 14:55:27 -0700 | [diff] [blame] | 141 | static int |
| 142 | check_subchannel(struct device * dev, void * data) |
| 143 | { |
| 144 | struct subchannel *sch; |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 145 | struct subchannel_id *schid = data; |
Cornelia Huck | b0744bd | 2005-06-25 14:55:27 -0700 | [diff] [blame] | 146 | |
| 147 | sch = to_subchannel(dev); |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 148 | return schid_equal(&sch->schid, schid); |
Cornelia Huck | b0744bd | 2005-06-25 14:55:27 -0700 | [diff] [blame] | 149 | } |
| 150 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | struct subchannel * |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 152 | get_subchannel_by_schid(struct subchannel_id schid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | struct device *dev; |
| 155 | |
Cornelia Huck | b0744bd | 2005-06-25 14:55:27 -0700 | [diff] [blame] | 156 | dev = bus_find_device(&css_bus_type, NULL, |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 157 | (void *)&schid, check_subchannel); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | |
Cornelia Huck | b0744bd | 2005-06-25 14:55:27 -0700 | [diff] [blame] | 159 | return dev ? to_subchannel(dev) : NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | } |
| 161 | |
Cornelia Huck | b0744bd | 2005-06-25 14:55:27 -0700 | [diff] [blame] | 162 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | static inline int |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 164 | css_get_subchannel_status(struct subchannel *sch, struct subchannel_id schid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | { |
| 166 | struct schib schib; |
| 167 | int cc; |
| 168 | |
| 169 | cc = stsch(schid, &schib); |
| 170 | if (cc) |
| 171 | return CIO_GONE; |
| 172 | if (!schib.pmcw.dnv) |
| 173 | return CIO_GONE; |
| 174 | if (sch && sch->schib.pmcw.dnv && |
| 175 | (schib.pmcw.dev != sch->schib.pmcw.dev)) |
| 176 | return CIO_REVALIDATE; |
| 177 | if (sch && !sch->lpm) |
| 178 | return CIO_NO_PATH; |
| 179 | return CIO_OPER; |
| 180 | } |
| 181 | |
| 182 | static int |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 183 | css_evaluate_subchannel(struct subchannel_id schid, int slow) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | { |
| 185 | int event, ret, disc; |
| 186 | struct subchannel *sch; |
| 187 | unsigned long flags; |
| 188 | |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 189 | sch = get_subchannel_by_schid(schid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | disc = sch ? device_is_disconnected(sch) : 0; |
| 191 | if (disc && slow) { |
| 192 | if (sch) |
| 193 | put_device(&sch->dev); |
| 194 | return 0; /* Already processed. */ |
| 195 | } |
| 196 | /* |
| 197 | * We've got a machine check, so running I/O won't get an interrupt. |
| 198 | * Kill any pending timers. |
| 199 | */ |
| 200 | if (sch) |
| 201 | device_kill_pending_timer(sch); |
| 202 | if (!disc && !slow) { |
| 203 | if (sch) |
| 204 | put_device(&sch->dev); |
| 205 | return -EAGAIN; /* Will be done on the slow path. */ |
| 206 | } |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 207 | event = css_get_subchannel_status(sch, schid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | CIO_MSG_EVENT(4, "Evaluating schid %04x, event %d, %s, %s path.\n", |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 209 | schid.sch_no, event, |
| 210 | sch?(disc?"disconnected":"normal"):"unknown", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | slow?"slow":"fast"); |
| 212 | switch (event) { |
| 213 | case CIO_NO_PATH: |
| 214 | case CIO_GONE: |
| 215 | if (!sch) { |
| 216 | /* Never used this subchannel. Ignore. */ |
| 217 | ret = 0; |
| 218 | break; |
| 219 | } |
| 220 | if (disc && (event == CIO_NO_PATH)) { |
| 221 | /* |
| 222 | * Uargh, hack again. Because we don't get a machine |
| 223 | * check on configure on, our path bookkeeping can |
| 224 | * be out of date here (it's fine while we only do |
| 225 | * logical varying or get chsc machine checks). We |
| 226 | * need to force reprobing or we might miss devices |
| 227 | * coming operational again. It won't do harm in real |
| 228 | * no path situations. |
| 229 | */ |
| 230 | spin_lock_irqsave(&sch->lock, flags); |
| 231 | device_trigger_reprobe(sch); |
| 232 | spin_unlock_irqrestore(&sch->lock, flags); |
| 233 | ret = 0; |
| 234 | break; |
| 235 | } |
| 236 | if (sch->driver && sch->driver->notify && |
| 237 | sch->driver->notify(&sch->dev, event)) { |
| 238 | cio_disable_subchannel(sch); |
| 239 | device_set_disconnected(sch); |
| 240 | ret = 0; |
| 241 | break; |
| 242 | } |
| 243 | /* |
| 244 | * Unregister subchannel. |
| 245 | * The device will be killed automatically. |
| 246 | */ |
| 247 | cio_disable_subchannel(sch); |
| 248 | device_unregister(&sch->dev); |
| 249 | /* Reset intparm to zeroes. */ |
| 250 | sch->schib.pmcw.intparm = 0; |
| 251 | cio_modify(sch); |
| 252 | put_device(&sch->dev); |
| 253 | ret = 0; |
| 254 | break; |
| 255 | case CIO_REVALIDATE: |
| 256 | /* |
| 257 | * Revalidation machine check. Sick. |
| 258 | * We don't notify the driver since we have to throw the device |
| 259 | * away in any case. |
| 260 | */ |
| 261 | if (!disc) { |
| 262 | device_unregister(&sch->dev); |
| 263 | /* Reset intparm to zeroes. */ |
| 264 | sch->schib.pmcw.intparm = 0; |
| 265 | cio_modify(sch); |
| 266 | put_device(&sch->dev); |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 267 | ret = css_probe_device(schid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | } else { |
| 269 | /* |
| 270 | * We can't immediately deregister the disconnected |
| 271 | * device since it might block. |
| 272 | */ |
| 273 | spin_lock_irqsave(&sch->lock, flags); |
| 274 | device_trigger_reprobe(sch); |
| 275 | spin_unlock_irqrestore(&sch->lock, flags); |
| 276 | ret = 0; |
| 277 | } |
| 278 | break; |
| 279 | case CIO_OPER: |
| 280 | if (disc) { |
| 281 | spin_lock_irqsave(&sch->lock, flags); |
| 282 | /* Get device operational again. */ |
| 283 | device_trigger_reprobe(sch); |
| 284 | spin_unlock_irqrestore(&sch->lock, flags); |
| 285 | } |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 286 | ret = sch ? 0 : css_probe_device(schid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | break; |
| 288 | default: |
| 289 | BUG(); |
| 290 | ret = 0; |
| 291 | } |
| 292 | return ret; |
| 293 | } |
| 294 | |
Cornelia Huck | f97a56f | 2006-01-06 00:19:22 -0800 | [diff] [blame] | 295 | static int |
| 296 | css_rescan_devices(struct subchannel_id schid, void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | { |
Cornelia Huck | f97a56f | 2006-01-06 00:19:22 -0800 | [diff] [blame] | 298 | return css_evaluate_subchannel(schid, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | } |
| 300 | |
| 301 | struct slow_subchannel { |
| 302 | struct list_head slow_list; |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 303 | struct subchannel_id schid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | }; |
| 305 | |
| 306 | static LIST_HEAD(slow_subchannels_head); |
| 307 | static DEFINE_SPINLOCK(slow_subchannel_lock); |
| 308 | |
| 309 | static void |
| 310 | css_trigger_slow_path(void) |
| 311 | { |
| 312 | CIO_TRACE_EVENT(4, "slowpath"); |
| 313 | |
| 314 | if (need_rescan) { |
| 315 | need_rescan = 0; |
Cornelia Huck | f97a56f | 2006-01-06 00:19:22 -0800 | [diff] [blame] | 316 | for_each_subchannel(css_rescan_devices, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | return; |
| 318 | } |
| 319 | |
| 320 | spin_lock_irq(&slow_subchannel_lock); |
| 321 | while (!list_empty(&slow_subchannels_head)) { |
| 322 | struct slow_subchannel *slow_sch = |
| 323 | list_entry(slow_subchannels_head.next, |
| 324 | struct slow_subchannel, slow_list); |
| 325 | |
| 326 | list_del_init(slow_subchannels_head.next); |
| 327 | spin_unlock_irq(&slow_subchannel_lock); |
| 328 | css_evaluate_subchannel(slow_sch->schid, 1); |
| 329 | spin_lock_irq(&slow_subchannel_lock); |
| 330 | kfree(slow_sch); |
| 331 | } |
| 332 | spin_unlock_irq(&slow_subchannel_lock); |
| 333 | } |
| 334 | |
| 335 | typedef void (*workfunc)(void *); |
| 336 | DECLARE_WORK(slow_path_work, (workfunc)css_trigger_slow_path, NULL); |
| 337 | struct workqueue_struct *slow_path_wq; |
| 338 | |
| 339 | /* |
| 340 | * Rescan for new devices. FIXME: This is slow. |
| 341 | * This function is called when we have lost CRWs due to overflows and we have |
| 342 | * to do subchannel housekeeping. |
| 343 | */ |
| 344 | void |
| 345 | css_reiterate_subchannels(void) |
| 346 | { |
| 347 | css_clear_subchannel_slow_list(); |
| 348 | need_rescan = 1; |
| 349 | } |
| 350 | |
| 351 | /* |
| 352 | * Called from the machine check handler for subchannel report words. |
| 353 | */ |
| 354 | int |
| 355 | css_process_crw(int irq) |
| 356 | { |
| 357 | int ret; |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 358 | struct subchannel_id mchk_schid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | |
| 360 | CIO_CRW_EVENT(2, "source is subchannel %04X\n", irq); |
| 361 | |
| 362 | if (need_rescan) |
| 363 | /* We need to iterate all subchannels anyway. */ |
| 364 | return -EAGAIN; |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 365 | |
| 366 | init_subchannel_id(&mchk_schid); |
| 367 | mchk_schid.sch_no = irq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | /* |
| 369 | * Since we are always presented with IPI in the CRW, we have to |
| 370 | * use stsch() to find out if the subchannel in question has come |
| 371 | * or gone. |
| 372 | */ |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 373 | ret = css_evaluate_subchannel(mchk_schid, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | if (ret == -EAGAIN) { |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 375 | if (css_enqueue_subchannel_slow(mchk_schid)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | css_clear_subchannel_slow_list(); |
| 377 | need_rescan = 1; |
| 378 | } |
| 379 | } |
| 380 | return ret; |
| 381 | } |
| 382 | |
Cornelia Huck | f97a56f | 2006-01-06 00:19:22 -0800 | [diff] [blame] | 383 | static int __init |
| 384 | __init_channel_subsystem(struct subchannel_id schid, void *data) |
| 385 | { |
| 386 | struct subchannel *sch; |
| 387 | int ret; |
| 388 | |
| 389 | if (cio_is_console(schid)) |
| 390 | sch = cio_get_console_subchannel(); |
| 391 | else { |
| 392 | sch = css_alloc_subchannel(schid); |
| 393 | if (IS_ERR(sch)) |
| 394 | ret = PTR_ERR(sch); |
| 395 | else |
| 396 | ret = 0; |
| 397 | switch (ret) { |
| 398 | case 0: |
| 399 | break; |
| 400 | case -ENOMEM: |
| 401 | panic("Out of memory in init_channel_subsystem\n"); |
| 402 | /* -ENXIO: no more subchannels. */ |
| 403 | case -ENXIO: |
| 404 | return ret; |
| 405 | default: |
| 406 | return 0; |
| 407 | } |
| 408 | } |
| 409 | /* |
| 410 | * We register ALL valid subchannels in ioinfo, even those |
| 411 | * that have been present before init_channel_subsystem. |
| 412 | * These subchannels can't have been registered yet (kmalloc |
| 413 | * not working) so we do it now. This is true e.g. for the |
| 414 | * console subchannel. |
| 415 | */ |
| 416 | css_register_subchannel(sch); |
| 417 | return 0; |
| 418 | } |
| 419 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 420 | static void __init |
Cornelia Huck | a28c694 | 2006-01-06 00:19:23 -0800 | [diff] [blame^] | 421 | css_generate_pgid(struct channel_subsystem *css, u32 tod_high) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 422 | { |
Cornelia Huck | a28c694 | 2006-01-06 00:19:23 -0800 | [diff] [blame^] | 423 | if (css_characteristics_avail && css_general_characteristics.mcss) { |
| 424 | css->global_pgid.pgid_high.ext_cssid.version = 0x80; |
| 425 | css->global_pgid.pgid_high.ext_cssid.cssid = css->cssid; |
| 426 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | #ifdef CONFIG_SMP |
Cornelia Huck | a28c694 | 2006-01-06 00:19:23 -0800 | [diff] [blame^] | 428 | css->global_pgid.pgid_high.cpu_addr = hard_smp_processor_id(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | #else |
Cornelia Huck | a28c694 | 2006-01-06 00:19:23 -0800 | [diff] [blame^] | 430 | css->global_pgid.pgid_high.cpu_addr = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | #endif |
| 432 | } |
Cornelia Huck | a28c694 | 2006-01-06 00:19:23 -0800 | [diff] [blame^] | 433 | css->global_pgid.cpu_id = ((cpuid_t *) __LC_CPUID)->ident; |
| 434 | css->global_pgid.cpu_model = ((cpuid_t *) __LC_CPUID)->machine; |
| 435 | css->global_pgid.tod_high = tod_high; |
| 436 | |
| 437 | } |
| 438 | |
| 439 | static inline void __init |
| 440 | setup_css(int nr) |
| 441 | { |
| 442 | u32 tod_high; |
| 443 | |
| 444 | memset(css[nr], 0, sizeof(struct channel_subsystem)); |
| 445 | css[nr]->valid = 1; |
| 446 | css[nr]->cssid = nr; |
| 447 | sprintf(css[nr]->device.bus_id, "css%x", nr); |
| 448 | tod_high = (u32) (get_clock() >> 32); |
| 449 | css_generate_pgid(css[nr], tod_high); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | } |
| 451 | |
| 452 | /* |
| 453 | * Now that the driver core is running, we can setup our channel subsystem. |
| 454 | * The struct subchannel's are created during probing (except for the |
| 455 | * static console subchannel). |
| 456 | */ |
| 457 | static int __init |
| 458 | init_channel_subsystem (void) |
| 459 | { |
Cornelia Huck | a28c694 | 2006-01-06 00:19:23 -0800 | [diff] [blame^] | 460 | int ret, i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | |
| 462 | if (chsc_determine_css_characteristics() == 0) |
| 463 | css_characteristics_avail = 1; |
| 464 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | if ((ret = bus_register(&css_bus_type))) |
| 466 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 467 | |
Cornelia Huck | a28c694 | 2006-01-06 00:19:23 -0800 | [diff] [blame^] | 468 | /* Setup css structure. */ |
| 469 | for (i = 0; i <= __MAX_CSSID; i++) { |
| 470 | css[i] = kmalloc(sizeof(struct channel_subsystem), GFP_KERNEL); |
| 471 | if (!css[i]) { |
| 472 | ret = -ENOMEM; |
| 473 | goto out_bus; |
| 474 | } |
| 475 | setup_css(i); |
| 476 | ret = device_register(&css[i]->device); |
| 477 | if (ret) |
| 478 | goto out_free; |
| 479 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | css_init_done = 1; |
| 481 | |
| 482 | ctl_set_bit(6, 28); |
| 483 | |
Cornelia Huck | f97a56f | 2006-01-06 00:19:22 -0800 | [diff] [blame] | 484 | for_each_subchannel(__init_channel_subsystem, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | return 0; |
Cornelia Huck | a28c694 | 2006-01-06 00:19:23 -0800 | [diff] [blame^] | 486 | out_free: |
| 487 | kfree(css[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | out_bus: |
Cornelia Huck | a28c694 | 2006-01-06 00:19:23 -0800 | [diff] [blame^] | 489 | while (i > 0) { |
| 490 | i--; |
| 491 | device_unregister(&css[i]->device); |
| 492 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 493 | bus_unregister(&css_bus_type); |
| 494 | out: |
| 495 | return ret; |
| 496 | } |
| 497 | |
| 498 | /* |
| 499 | * find a driver for a subchannel. They identify by the subchannel |
| 500 | * type with the exception that the console subchannel driver has its own |
| 501 | * subchannel type although the device is an i/o subchannel |
| 502 | */ |
| 503 | static int |
| 504 | css_bus_match (struct device *dev, struct device_driver *drv) |
| 505 | { |
| 506 | struct subchannel *sch = container_of (dev, struct subchannel, dev); |
| 507 | struct css_driver *driver = container_of (drv, struct css_driver, drv); |
| 508 | |
| 509 | if (sch->st == driver->subchannel_type) |
| 510 | return 1; |
| 511 | |
| 512 | return 0; |
| 513 | } |
| 514 | |
| 515 | struct bus_type css_bus_type = { |
| 516 | .name = "css", |
| 517 | .match = &css_bus_match, |
| 518 | }; |
| 519 | |
| 520 | subsys_initcall(init_channel_subsystem); |
| 521 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | int |
Cornelia Huck | a8237fc | 2006-01-06 00:19:21 -0800 | [diff] [blame] | 523 | css_enqueue_subchannel_slow(struct subchannel_id schid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | { |
| 525 | struct slow_subchannel *new_slow_sch; |
| 526 | unsigned long flags; |
| 527 | |
| 528 | new_slow_sch = kmalloc(sizeof(struct slow_subchannel), GFP_ATOMIC); |
| 529 | if (!new_slow_sch) |
| 530 | return -ENOMEM; |
| 531 | memset(new_slow_sch, 0, sizeof(struct slow_subchannel)); |
| 532 | new_slow_sch->schid = schid; |
| 533 | spin_lock_irqsave(&slow_subchannel_lock, flags); |
| 534 | list_add_tail(&new_slow_sch->slow_list, &slow_subchannels_head); |
| 535 | spin_unlock_irqrestore(&slow_subchannel_lock, flags); |
| 536 | return 0; |
| 537 | } |
| 538 | |
| 539 | void |
| 540 | css_clear_subchannel_slow_list(void) |
| 541 | { |
| 542 | unsigned long flags; |
| 543 | |
| 544 | spin_lock_irqsave(&slow_subchannel_lock, flags); |
| 545 | while (!list_empty(&slow_subchannels_head)) { |
| 546 | struct slow_subchannel *slow_sch = |
| 547 | list_entry(slow_subchannels_head.next, |
| 548 | struct slow_subchannel, slow_list); |
| 549 | |
| 550 | list_del_init(slow_subchannels_head.next); |
| 551 | kfree(slow_sch); |
| 552 | } |
| 553 | spin_unlock_irqrestore(&slow_subchannel_lock, flags); |
| 554 | } |
| 555 | |
| 556 | |
| 557 | |
| 558 | int |
| 559 | css_slow_subchannels_exist(void) |
| 560 | { |
| 561 | return (!list_empty(&slow_subchannels_head)); |
| 562 | } |
| 563 | |
| 564 | MODULE_LICENSE("GPL"); |
| 565 | EXPORT_SYMBOL(css_bus_type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 566 | EXPORT_SYMBOL_GPL(css_characteristics_avail); |