1 /*
2 * Functions to handle I2O controllers and I2O message handling
3 *
4 * Copyright (C) 1999-2002 Red Hat Software
5 *
6 * Written by Alan Cox, Building Number Three Ltd
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
12 *
13 * A lot of the I2O message side code from this is taken from the
14 * Red Creek RCPCI45 adapter driver by Red Creek Communications
15 *
16 * Fixes/additions:
17 * Philipp Rumpf
18 * Juha Sievänen <Juha.Sievanen@cs.Helsinki.FI>
19 * Auvo Häkkinen <Auvo.Hakkinen@cs.Helsinki.FI>
20 * Deepak Saxena <deepak@plexity.net>
21 * Boji T Kannanthanam <boji.t.kannanthanam@intel.com>
22 * Alan Cox <alan@lxorguk.ukuu.org.uk>:
23 * Ported to Linux 2.5.
24 * Markus Lidel <Markus.Lidel@shadowconnect.com>:
25 * Minor fixes for 2.6.
26 */
27
28 #include <linux/module.h>
29 #include "i2o.h"
30 #include <linux/delay.h>
31 #include <linux/sched.h>
32 #include <linux/slab.h>
33 #include "core.h"
34
35 #define OSM_NAME "i2o"
36 #define OSM_VERSION "1.325"
37 #define OSM_DESCRIPTION "I2O subsystem"
38
39 /* global I2O controller list */
40 LIST_HEAD(i2o_controllers);
41
42 /*
43 * global I2O System Table. Contains information about all the IOPs in the
44 * system. Used to inform IOPs about each others existence.
45 */
46 static struct i2o_dma i2o_systab;
47
48 static int i2o_hrt_get(struct i2o_controller *c);
49
50 /**
51 * i2o_msg_get_wait - obtain an I2O message from the IOP
52 * @c: I2O controller
53 * @wait: how long to wait until timeout
54 *
55 * This function waits up to wait seconds for a message slot to be
56 * available.
57 *
58 * On a success the message is returned and the pointer to the message is
59 * set in msg. The returned message is the physical page frame offset
60 * address from the read port (see the i2o spec). If no message is
61 * available returns I2O_QUEUE_EMPTY and msg is leaved untouched.
62 */
i2o_msg_get_wait(struct i2o_controller * c,int wait)63 struct i2o_message *i2o_msg_get_wait(struct i2o_controller *c, int wait)
64 {
65 unsigned long timeout = jiffies + wait * HZ;
66 struct i2o_message *msg;
67
68 while (IS_ERR(msg = i2o_msg_get(c))) {
69 if (time_after(jiffies, timeout)) {
70 osm_debug("%s: Timeout waiting for message frame.\n",
71 c->name);
72 return ERR_PTR(-ETIMEDOUT);
73 }
74 schedule_timeout_uninterruptible(1);
75 }
76
77 return msg;
78 };
79
80 #if BITS_PER_LONG == 64
81 /**
82 * i2o_cntxt_list_add - Append a pointer to context list and return a id
83 * @c: controller to which the context list belong
84 * @ptr: pointer to add to the context list
85 *
86 * Because the context field in I2O is only 32-bit large, on 64-bit the
87 * pointer is to large to fit in the context field. The i2o_cntxt_list
88 * functions therefore map pointers to context fields.
89 *
90 * Returns context id > 0 on success or 0 on failure.
91 */
i2o_cntxt_list_add(struct i2o_controller * c,void * ptr)92 u32 i2o_cntxt_list_add(struct i2o_controller * c, void *ptr)
93 {
94 struct i2o_context_list_element *entry;
95 unsigned long flags;
96
97 if (!ptr)
98 osm_err("%s: couldn't add NULL pointer to context list!\n",
99 c->name);
100
101 entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
102 if (!entry) {
103 osm_err("%s: Could not allocate memory for context list element"
104 "\n", c->name);
105 return 0;
106 }
107
108 entry->ptr = ptr;
109 entry->timestamp = jiffies;
110 INIT_LIST_HEAD(&entry->list);
111
112 spin_lock_irqsave(&c->context_list_lock, flags);
113
114 if (unlikely(atomic_inc_and_test(&c->context_list_counter)))
115 atomic_inc(&c->context_list_counter);
116
117 entry->context = atomic_read(&c->context_list_counter);
118
119 list_add(&entry->list, &c->context_list);
120
121 spin_unlock_irqrestore(&c->context_list_lock, flags);
122
123 osm_debug("%s: Add context to list %p -> %d\n", c->name, ptr, context);
124
125 return entry->context;
126 };
127
128 /**
129 * i2o_cntxt_list_remove - Remove a pointer from the context list
130 * @c: controller to which the context list belong
131 * @ptr: pointer which should be removed from the context list
132 *
133 * Removes a previously added pointer from the context list and returns
134 * the matching context id.
135 *
136 * Returns context id on success or 0 on failure.
137 */
i2o_cntxt_list_remove(struct i2o_controller * c,void * ptr)138 u32 i2o_cntxt_list_remove(struct i2o_controller * c, void *ptr)
139 {
140 struct i2o_context_list_element *entry;
141 u32 context = 0;
142 unsigned long flags;
143
144 spin_lock_irqsave(&c->context_list_lock, flags);
145 list_for_each_entry(entry, &c->context_list, list)
146 if (entry->ptr == ptr) {
147 list_del(&entry->list);
148 context = entry->context;
149 kfree(entry);
150 break;
151 }
152 spin_unlock_irqrestore(&c->context_list_lock, flags);
153
154 if (!context)
155 osm_warn("%s: Could not remove nonexistent ptr %p\n", c->name,
156 ptr);
157
158 osm_debug("%s: remove ptr from context list %d -> %p\n", c->name,
159 context, ptr);
160
161 return context;
162 };
163
164 /**
165 * i2o_cntxt_list_get - Get a pointer from the context list and remove it
166 * @c: controller to which the context list belong
167 * @context: context id to which the pointer belong
168 *
169 * Returns pointer to the matching context id on success or NULL on
170 * failure.
171 */
i2o_cntxt_list_get(struct i2o_controller * c,u32 context)172 void *i2o_cntxt_list_get(struct i2o_controller *c, u32 context)
173 {
174 struct i2o_context_list_element *entry;
175 unsigned long flags;
176 void *ptr = NULL;
177
178 spin_lock_irqsave(&c->context_list_lock, flags);
179 list_for_each_entry(entry, &c->context_list, list)
180 if (entry->context == context) {
181 list_del(&entry->list);
182 ptr = entry->ptr;
183 kfree(entry);
184 break;
185 }
186 spin_unlock_irqrestore(&c->context_list_lock, flags);
187
188 if (!ptr)
189 osm_warn("%s: context id %d not found\n", c->name, context);
190
191 osm_debug("%s: get ptr from context list %d -> %p\n", c->name, context,
192 ptr);
193
194 return ptr;
195 };
196
197 /**
198 * i2o_cntxt_list_get_ptr - Get a context id from the context list
199 * @c: controller to which the context list belong
200 * @ptr: pointer to which the context id should be fetched
201 *
202 * Returns context id which matches to the pointer on success or 0 on
203 * failure.
204 */
i2o_cntxt_list_get_ptr(struct i2o_controller * c,void * ptr)205 u32 i2o_cntxt_list_get_ptr(struct i2o_controller * c, void *ptr)
206 {
207 struct i2o_context_list_element *entry;
208 u32 context = 0;
209 unsigned long flags;
210
211 spin_lock_irqsave(&c->context_list_lock, flags);
212 list_for_each_entry(entry, &c->context_list, list)
213 if (entry->ptr == ptr) {
214 context = entry->context;
215 break;
216 }
217 spin_unlock_irqrestore(&c->context_list_lock, flags);
218
219 if (!context)
220 osm_warn("%s: Could not find nonexistent ptr %p\n", c->name,
221 ptr);
222
223 osm_debug("%s: get context id from context list %p -> %d\n", c->name,
224 ptr, context);
225
226 return context;
227 };
228 #endif
229
230 /**
231 * i2o_iop_find - Find an I2O controller by id
232 * @unit: unit number of the I2O controller to search for
233 *
234 * Lookup the I2O controller on the controller list.
235 *
236 * Returns pointer to the I2O controller on success or NULL if not found.
237 */
i2o_find_iop(int unit)238 struct i2o_controller *i2o_find_iop(int unit)
239 {
240 struct i2o_controller *c;
241
242 list_for_each_entry(c, &i2o_controllers, list) {
243 if (c->unit == unit)
244 return c;
245 }
246
247 return NULL;
248 };
249
250 /**
251 * i2o_iop_find_device - Find a I2O device on an I2O controller
252 * @c: I2O controller where the I2O device hangs on
253 * @tid: TID of the I2O device to search for
254 *
255 * Searches the devices of the I2O controller for a device with TID tid and
256 * returns it.
257 *
258 * Returns a pointer to the I2O device if found, otherwise NULL.
259 */
i2o_iop_find_device(struct i2o_controller * c,u16 tid)260 struct i2o_device *i2o_iop_find_device(struct i2o_controller *c, u16 tid)
261 {
262 struct i2o_device *dev;
263
264 list_for_each_entry(dev, &c->devices, list)
265 if (dev->lct_data.tid == tid)
266 return dev;
267
268 return NULL;
269 };
270
271 /**
272 * i2o_quiesce_controller - quiesce controller
273 * @c: controller
274 *
275 * Quiesce an IOP. Causes IOP to make external operation quiescent
276 * (i2o 'READY' state). Internal operation of the IOP continues normally.
277 *
278 * Returns 0 on success or negative error code on failure.
279 */
i2o_iop_quiesce(struct i2o_controller * c)280 static int i2o_iop_quiesce(struct i2o_controller *c)
281 {
282 struct i2o_message *msg;
283 i2o_status_block *sb = c->status_block.virt;
284 int rc;
285
286 i2o_status_get(c);
287
288 /* SysQuiesce discarded if IOP not in READY or OPERATIONAL state */
289 if ((sb->iop_state != ADAPTER_STATE_READY) &&
290 (sb->iop_state != ADAPTER_STATE_OPERATIONAL))
291 return 0;
292
293 msg = i2o_msg_get_wait(c, I2O_TIMEOUT_MESSAGE_GET);
294 if (IS_ERR(msg))
295 return PTR_ERR(msg);
296
297 msg->u.head[0] = cpu_to_le32(FOUR_WORD_MSG_SIZE | SGL_OFFSET_0);
298 msg->u.head[1] =
299 cpu_to_le32(I2O_CMD_SYS_QUIESCE << 24 | HOST_TID << 12 |
300 ADAPTER_TID);
301
302 /* Long timeout needed for quiesce if lots of devices */
303 if ((rc = i2o_msg_post_wait(c, msg, 240)))
304 osm_info("%s: Unable to quiesce (status=%#x).\n", c->name, -rc);
305 else
306 osm_debug("%s: Quiesced.\n", c->name);
307
308 i2o_status_get(c); // Entered READY state
309
310 return rc;
311 };
312
313 /**
314 * i2o_iop_enable - move controller from ready to OPERATIONAL
315 * @c: I2O controller
316 *
317 * Enable IOP. This allows the IOP to resume external operations and
318 * reverses the effect of a quiesce. Returns zero or an error code if
319 * an error occurs.
320 */
i2o_iop_enable(struct i2o_controller * c)321 static int i2o_iop_enable(struct i2o_controller *c)
322 {
323 struct i2o_message *msg;
324 i2o_status_block *sb = c->status_block.virt;
325 int rc;
326
327 i2o_status_get(c);
328
329 /* Enable only allowed on READY state */
330 if (sb->iop_state != ADAPTER_STATE_READY)
331 return -EINVAL;
332
333 msg = i2o_msg_get_wait(c, I2O_TIMEOUT_MESSAGE_GET);
334 if (IS_ERR(msg))
335 return PTR_ERR(msg);
336
337 msg->u.head[0] = cpu_to_le32(FOUR_WORD_MSG_SIZE | SGL_OFFSET_0);
338 msg->u.head[1] =
339 cpu_to_le32(I2O_CMD_SYS_ENABLE << 24 | HOST_TID << 12 |
340 ADAPTER_TID);
341
342 /* How long of a timeout do we need? */
343 if ((rc = i2o_msg_post_wait(c, msg, 240)))
344 osm_err("%s: Could not enable (status=%#x).\n", c->name, -rc);
345 else
346 osm_debug("%s: Enabled.\n", c->name);
347
348 i2o_status_get(c); // entered OPERATIONAL state
349
350 return rc;
351 };
352
353 /**
354 * i2o_iop_quiesce_all - Quiesce all I2O controllers on the system
355 *
356 * Quiesce all I2O controllers which are connected to the system.
357 */
i2o_iop_quiesce_all(void)358 static inline void i2o_iop_quiesce_all(void)
359 {
360 struct i2o_controller *c, *tmp;
361
362 list_for_each_entry_safe(c, tmp, &i2o_controllers, list) {
363 if (!c->no_quiesce)
364 i2o_iop_quiesce(c);
365 }
366 };
367
368 /**
369 * i2o_iop_enable_all - Enables all controllers on the system
370 *
371 * Enables all I2O controllers which are connected to the system.
372 */
i2o_iop_enable_all(void)373 static inline void i2o_iop_enable_all(void)
374 {
375 struct i2o_controller *c, *tmp;
376
377 list_for_each_entry_safe(c, tmp, &i2o_controllers, list)
378 i2o_iop_enable(c);
379 };
380
381 /**
382 * i2o_clear_controller - Bring I2O controller into HOLD state
383 * @c: controller
384 *
385 * Clear an IOP to HOLD state, ie. terminate external operations, clear all
386 * input queues and prepare for a system restart. IOP's internal operation
387 * continues normally and the outbound queue is alive. The IOP is not
388 * expected to rebuild its LCT.
389 *
390 * Returns 0 on success or negative error code on failure.
391 */
i2o_iop_clear(struct i2o_controller * c)392 static int i2o_iop_clear(struct i2o_controller *c)
393 {
394 struct i2o_message *msg;
395 int rc;
396
397 msg = i2o_msg_get_wait(c, I2O_TIMEOUT_MESSAGE_GET);
398 if (IS_ERR(msg))
399 return PTR_ERR(msg);
400
401 /* Quiesce all IOPs first */
402 i2o_iop_quiesce_all();
403
404 msg->u.head[0] = cpu_to_le32(FOUR_WORD_MSG_SIZE | SGL_OFFSET_0);
405 msg->u.head[1] =
406 cpu_to_le32(I2O_CMD_ADAPTER_CLEAR << 24 | HOST_TID << 12 |
407 ADAPTER_TID);
408
409 if ((rc = i2o_msg_post_wait(c, msg, 30)))
410 osm_info("%s: Unable to clear (status=%#x).\n", c->name, -rc);
411 else
412 osm_debug("%s: Cleared.\n", c->name);
413
414 /* Enable all IOPs */
415 i2o_iop_enable_all();
416
417 return rc;
418 }
419
420 /**
421 * i2o_iop_init_outbound_queue - setup the outbound message queue
422 * @c: I2O controller
423 *
424 * Clear and (re)initialize IOP's outbound queue and post the message
425 * frames to the IOP.
426 *
427 * Returns 0 on success or negative error code on failure.
428 */
i2o_iop_init_outbound_queue(struct i2o_controller * c)429 static int i2o_iop_init_outbound_queue(struct i2o_controller *c)
430 {
431 u32 m;
432 volatile u8 *status = c->status.virt;
433 struct i2o_message *msg;
434 ulong timeout;
435 int i;
436
437 osm_debug("%s: Initializing Outbound Queue...\n", c->name);
438
439 memset(c->status.virt, 0, 4);
440
441 msg = i2o_msg_get_wait(c, I2O_TIMEOUT_MESSAGE_GET);
442 if (IS_ERR(msg))
443 return PTR_ERR(msg);
444
445 msg->u.head[0] = cpu_to_le32(EIGHT_WORD_MSG_SIZE | SGL_OFFSET_6);
446 msg->u.head[1] =
447 cpu_to_le32(I2O_CMD_OUTBOUND_INIT << 24 | HOST_TID << 12 |
448 ADAPTER_TID);
449 msg->u.s.icntxt = cpu_to_le32(i2o_exec_driver.context);
450 msg->u.s.tcntxt = cpu_to_le32(0x00000000);
451 msg->body[0] = cpu_to_le32(PAGE_SIZE);
452 /* Outbound msg frame size in words and Initcode */
453 msg->body[1] = cpu_to_le32(I2O_OUTBOUND_MSG_FRAME_SIZE << 16 | 0x80);
454 msg->body[2] = cpu_to_le32(0xd0000004);
455 msg->body[3] = cpu_to_le32(i2o_dma_low(c->status.phys));
456 msg->body[4] = cpu_to_le32(i2o_dma_high(c->status.phys));
457
458 i2o_msg_post(c, msg);
459
460 timeout = jiffies + I2O_TIMEOUT_INIT_OUTBOUND_QUEUE * HZ;
461 while (*status <= I2O_CMD_IN_PROGRESS) {
462 if (time_after(jiffies, timeout)) {
463 osm_warn("%s: Timeout Initializing\n", c->name);
464 return -ETIMEDOUT;
465 }
466 schedule_timeout_uninterruptible(1);
467 }
468
469 m = c->out_queue.phys;
470
471 /* Post frames */
472 for (i = 0; i < I2O_MAX_OUTBOUND_MSG_FRAMES; i++) {
473 i2o_flush_reply(c, m);
474 udelay(1); /* Promise */
475 m += I2O_OUTBOUND_MSG_FRAME_SIZE * sizeof(u32);
476 }
477
478 return 0;
479 }
480
481 /**
482 * i2o_iop_reset - reset an I2O controller
483 * @c: controller to reset
484 *
485 * Reset the IOP into INIT state and wait until IOP gets into RESET state.
486 * Terminate all external operations, clear IOP's inbound and outbound
487 * queues, terminate all DDMs, and reload the IOP's operating environment
488 * and all local DDMs. The IOP rebuilds its LCT.
489 */
i2o_iop_reset(struct i2o_controller * c)490 static int i2o_iop_reset(struct i2o_controller *c)
491 {
492 volatile u8 *status = c->status.virt;
493 struct i2o_message *msg;
494 unsigned long timeout;
495 i2o_status_block *sb = c->status_block.virt;
496 int rc = 0;
497
498 osm_debug("%s: Resetting controller\n", c->name);
499
500 msg = i2o_msg_get_wait(c, I2O_TIMEOUT_MESSAGE_GET);
501 if (IS_ERR(msg))
502 return PTR_ERR(msg);
503
504 memset(c->status_block.virt, 0, 8);
505
506 /* Quiesce all IOPs first */
507 i2o_iop_quiesce_all();
508
509 msg->u.head[0] = cpu_to_le32(EIGHT_WORD_MSG_SIZE | SGL_OFFSET_0);
510 msg->u.head[1] =
511 cpu_to_le32(I2O_CMD_ADAPTER_RESET << 24 | HOST_TID << 12 |
512 ADAPTER_TID);
513 msg->u.s.icntxt = cpu_to_le32(i2o_exec_driver.context);
514 msg->u.s.tcntxt = cpu_to_le32(0x00000000);
515 msg->body[0] = cpu_to_le32(0x00000000);
516 msg->body[1] = cpu_to_le32(0x00000000);
517 msg->body[2] = cpu_to_le32(i2o_dma_low(c->status.phys));
518 msg->body[3] = cpu_to_le32(i2o_dma_high(c->status.phys));
519
520 i2o_msg_post(c, msg);
521
522 /* Wait for a reply */
523 timeout = jiffies + I2O_TIMEOUT_RESET * HZ;
524 while (!*status) {
525 if (time_after(jiffies, timeout))
526 break;
527
528 schedule_timeout_uninterruptible(1);
529 }
530
531 switch (*status) {
532 case I2O_CMD_REJECTED:
533 osm_warn("%s: IOP reset rejected\n", c->name);
534 rc = -EPERM;
535 break;
536
537 case I2O_CMD_IN_PROGRESS:
538 /*
539 * Once the reset is sent, the IOP goes into the INIT state
540 * which is indeterminate. We need to wait until the IOP has
541 * rebooted before we can let the system talk to it. We read
542 * the inbound Free_List until a message is available. If we
543 * can't read one in the given amount of time, we assume the
544 * IOP could not reboot properly.
545 */
546 osm_debug("%s: Reset in progress, waiting for reboot...\n",
547 c->name);
548
549 while (IS_ERR(msg = i2o_msg_get_wait(c, I2O_TIMEOUT_RESET))) {
550 if (time_after(jiffies, timeout)) {
551 osm_err("%s: IOP reset timeout.\n", c->name);
552 rc = PTR_ERR(msg);
553 goto exit;
554 }
555 schedule_timeout_uninterruptible(1);
556 }
557 i2o_msg_nop(c, msg);
558
559 /* from here all quiesce commands are safe */
560 c->no_quiesce = 0;
561
562 /* verify if controller is in state RESET */
563 i2o_status_get(c);
564
565 if (!c->promise && (sb->iop_state != ADAPTER_STATE_RESET))
566 osm_warn("%s: reset completed, but adapter not in RESET"
567 " state.\n", c->name);
568 else
569 osm_debug("%s: reset completed.\n", c->name);
570
571 break;
572
573 default:
574 osm_err("%s: IOP reset timeout.\n", c->name);
575 rc = -ETIMEDOUT;
576 break;
577 }
578
579 exit:
580 /* Enable all IOPs */
581 i2o_iop_enable_all();
582
583 return rc;
584 };
585
586 /**
587 * i2o_iop_activate - Bring controller up to HOLD
588 * @c: controller
589 *
590 * This function brings an I2O controller into HOLD state. The adapter
591 * is reset if necessary and then the queues and resource table are read.
592 *
593 * Returns 0 on success or negative error code on failure.
594 */
i2o_iop_activate(struct i2o_controller * c)595 static int i2o_iop_activate(struct i2o_controller *c)
596 {
597 i2o_status_block *sb = c->status_block.virt;
598 int rc;
599 int state;
600
601 /* In INIT state, Wait Inbound Q to initialize (in i2o_status_get) */
602 /* In READY state, Get status */
603
604 rc = i2o_status_get(c);
605 if (rc) {
606 osm_info("%s: Unable to obtain status, attempting a reset.\n",
607 c->name);
608 rc = i2o_iop_reset(c);
609 if (rc)
610 return rc;
611 }
612
613 if (sb->i2o_version > I2OVER15) {
614 osm_err("%s: Not running version 1.5 of the I2O Specification."
615 "\n", c->name);
616 return -ENODEV;
617 }
618
619 switch (sb->iop_state) {
620 case ADAPTER_STATE_FAULTED:
621 osm_err("%s: hardware fault\n", c->name);
622 return -EFAULT;
623
624 case ADAPTER_STATE_READY:
625 case ADAPTER_STATE_OPERATIONAL:
626 case ADAPTER_STATE_HOLD:
627 case ADAPTER_STATE_FAILED:
628 osm_debug("%s: already running, trying to reset...\n", c->name);
629 rc = i2o_iop_reset(c);
630 if (rc)
631 return rc;
632 }
633
634 /* preserve state */
635 state = sb->iop_state;
636
637 rc = i2o_iop_init_outbound_queue(c);
638 if (rc)
639 return rc;
640
641 /* if adapter was not in RESET state clear now */
642 if (state != ADAPTER_STATE_RESET)
643 i2o_iop_clear(c);
644
645 i2o_status_get(c);
646
647 if (sb->iop_state != ADAPTER_STATE_HOLD) {
648 osm_err("%s: failed to bring IOP into HOLD state\n", c->name);
649 return -EIO;
650 }
651
652 return i2o_hrt_get(c);
653 };
654
i2o_res_alloc(struct i2o_controller * c,unsigned long flags)655 static void i2o_res_alloc(struct i2o_controller *c, unsigned long flags)
656 {
657 i2o_status_block *sb = c->status_block.virt;
658 struct resource *res = &c->mem_resource;
659 resource_size_t size, align;
660 int err;
661
662 res->name = c->pdev->bus->name;
663 res->flags = flags;
664 res->start = 0;
665 res->end = 0;
666 osm_info("%s: requires private memory resources.\n", c->name);
667
668 if (flags & IORESOURCE_MEM) {
669 size = sb->desired_mem_size;
670 align = 1 << 20; /* unspecified, use 1Mb and play safe */
671 } else {
672 size = sb->desired_io_size;
673 align = 1 << 12; /* unspecified, use 4Kb and play safe */
674 }
675
676 err = pci_bus_alloc_resource(c->pdev->bus, res, size, align, 0, 0,
677 NULL, NULL);
678 if (err < 0)
679 return;
680
681 if (flags & IORESOURCE_MEM) {
682 c->mem_alloc = 1;
683 sb->current_mem_size = resource_size(res);
684 sb->current_mem_base = res->start;
685 } else if (flags & IORESOURCE_IO) {
686 c->io_alloc = 1;
687 sb->current_io_size = resource_size(res);
688 sb->current_io_base = res->start;
689 }
690 osm_info("%s: allocated PCI space %pR\n", c->name, res);
691 }
692
693 /**
694 * i2o_iop_systab_set - Set the I2O System Table of the specified IOP
695 * @c: I2O controller to which the system table should be send
696 *
697 * Before the systab could be set i2o_systab_build() must be called.
698 *
699 * Returns 0 on success or negative error code on failure.
700 */
i2o_iop_systab_set(struct i2o_controller * c)701 static int i2o_iop_systab_set(struct i2o_controller *c)
702 {
703 struct i2o_message *msg;
704 i2o_status_block *sb = c->status_block.virt;
705 struct device *dev = &c->pdev->dev;
706 int rc;
707
708 if (sb->current_mem_size < sb->desired_mem_size)
709 i2o_res_alloc(c, IORESOURCE_MEM);
710
711 if (sb->current_io_size < sb->desired_io_size)
712 i2o_res_alloc(c, IORESOURCE_IO);
713
714 msg = i2o_msg_get_wait(c, I2O_TIMEOUT_MESSAGE_GET);
715 if (IS_ERR(msg))
716 return PTR_ERR(msg);
717
718 i2o_systab.phys = dma_map_single(dev, i2o_systab.virt, i2o_systab.len,
719 PCI_DMA_TODEVICE);
720 if (!i2o_systab.phys) {
721 i2o_msg_nop(c, msg);
722 return -ENOMEM;
723 }
724
725 msg->u.head[0] = cpu_to_le32(I2O_MESSAGE_SIZE(12) | SGL_OFFSET_6);
726 msg->u.head[1] =
727 cpu_to_le32(I2O_CMD_SYS_TAB_SET << 24 | HOST_TID << 12 |
728 ADAPTER_TID);
729
730 /*
731 * Provide three SGL-elements:
732 * System table (SysTab), Private memory space declaration and
733 * Private i/o space declaration
734 */
735
736 msg->body[0] = cpu_to_le32(c->unit + 2);
737 msg->body[1] = cpu_to_le32(0x00000000);
738 msg->body[2] = cpu_to_le32(0x54000000 | i2o_systab.len);
739 msg->body[3] = cpu_to_le32(i2o_systab.phys);
740 msg->body[4] = cpu_to_le32(0x54000000 | sb->current_mem_size);
741 msg->body[5] = cpu_to_le32(sb->current_mem_base);
742 msg->body[6] = cpu_to_le32(0xd4000000 | sb->current_io_size);
743 msg->body[6] = cpu_to_le32(sb->current_io_base);
744
745 rc = i2o_msg_post_wait(c, msg, 120);
746
747 dma_unmap_single(dev, i2o_systab.phys, i2o_systab.len,
748 PCI_DMA_TODEVICE);
749
750 if (rc < 0)
751 osm_err("%s: Unable to set SysTab (status=%#x).\n", c->name,
752 -rc);
753 else
754 osm_debug("%s: SysTab set.\n", c->name);
755
756 return rc;
757 }
758
759 /**
760 * i2o_iop_online - Bring a controller online into OPERATIONAL state.
761 * @c: I2O controller
762 *
763 * Send the system table and enable the I2O controller.
764 *
765 * Returns 0 on success or negative error code on failure.
766 */
i2o_iop_online(struct i2o_controller * c)767 static int i2o_iop_online(struct i2o_controller *c)
768 {
769 int rc;
770
771 rc = i2o_iop_systab_set(c);
772 if (rc)
773 return rc;
774
775 /* In READY state */
776 osm_debug("%s: Attempting to enable...\n", c->name);
777 rc = i2o_iop_enable(c);
778 if (rc)
779 return rc;
780
781 return 0;
782 };
783
784 /**
785 * i2o_iop_remove - Remove the I2O controller from the I2O core
786 * @c: I2O controller
787 *
788 * Remove the I2O controller from the I2O core. If devices are attached to
789 * the controller remove these also and finally reset the controller.
790 */
i2o_iop_remove(struct i2o_controller * c)791 void i2o_iop_remove(struct i2o_controller *c)
792 {
793 struct i2o_device *dev, *tmp;
794
795 osm_debug("%s: deleting controller\n", c->name);
796
797 i2o_driver_notify_controller_remove_all(c);
798
799 list_del(&c->list);
800
801 list_for_each_entry_safe(dev, tmp, &c->devices, list)
802 i2o_device_remove(dev);
803
804 device_del(&c->device);
805
806 /* Ask the IOP to switch to RESET state */
807 i2o_iop_reset(c);
808 }
809
810 /**
811 * i2o_systab_build - Build system table
812 *
813 * The system table contains information about all the IOPs in the system
814 * (duh) and is used by the Executives on the IOPs to establish peer2peer
815 * connections. We're not supporting peer2peer at the moment, but this
816 * will be needed down the road for things like lan2lan forwarding.
817 *
818 * Returns 0 on success or negative error code on failure.
819 */
i2o_systab_build(void)820 static int i2o_systab_build(void)
821 {
822 struct i2o_controller *c, *tmp;
823 int num_controllers = 0;
824 u32 change_ind = 0;
825 int count = 0;
826 struct i2o_sys_tbl *systab = i2o_systab.virt;
827
828 list_for_each_entry_safe(c, tmp, &i2o_controllers, list)
829 num_controllers++;
830
831 if (systab) {
832 change_ind = systab->change_ind;
833 kfree(i2o_systab.virt);
834 }
835
836 /* Header + IOPs */
837 i2o_systab.len = sizeof(struct i2o_sys_tbl) + num_controllers *
838 sizeof(struct i2o_sys_tbl_entry);
839
840 systab = i2o_systab.virt = kzalloc(i2o_systab.len, GFP_KERNEL);
841 if (!systab) {
842 osm_err("unable to allocate memory for System Table\n");
843 return -ENOMEM;
844 }
845
846 systab->version = I2OVERSION;
847 systab->change_ind = change_ind + 1;
848
849 list_for_each_entry_safe(c, tmp, &i2o_controllers, list) {
850 i2o_status_block *sb;
851
852 if (count >= num_controllers) {
853 osm_err("controller added while building system table"
854 "\n");
855 break;
856 }
857
858 sb = c->status_block.virt;
859
860 /*
861 * Get updated IOP state so we have the latest information
862 *
863 * We should delete the controller at this point if it
864 * doesn't respond since if it's not on the system table
865 * it is techninically not part of the I2O subsystem...
866 */
867 if (unlikely(i2o_status_get(c))) {
868 osm_err("%s: Deleting b/c could not get status while "
869 "attempting to build system table\n", c->name);
870 i2o_iop_remove(c);
871 continue; // try the next one
872 }
873
874 systab->iops[count].org_id = sb->org_id;
875 systab->iops[count].iop_id = c->unit + 2;
876 systab->iops[count].seg_num = 0;
877 systab->iops[count].i2o_version = sb->i2o_version;
878 systab->iops[count].iop_state = sb->iop_state;
879 systab->iops[count].msg_type = sb->msg_type;
880 systab->iops[count].frame_size = sb->inbound_frame_size;
881 systab->iops[count].last_changed = change_ind;
882 systab->iops[count].iop_capabilities = sb->iop_capabilities;
883 systab->iops[count].inbound_low =
884 i2o_dma_low(c->base.phys + I2O_IN_PORT);
885 systab->iops[count].inbound_high =
886 i2o_dma_high(c->base.phys + I2O_IN_PORT);
887
888 count++;
889 }
890
891 systab->num_entries = count;
892
893 return 0;
894 };
895
896 /**
897 * i2o_parse_hrt - Parse the hardware resource table.
898 * @c: I2O controller
899 *
900 * We don't do anything with it except dumping it (in debug mode).
901 *
902 * Returns 0.
903 */
i2o_parse_hrt(struct i2o_controller * c)904 static int i2o_parse_hrt(struct i2o_controller *c)
905 {
906 i2o_dump_hrt(c);
907 return 0;
908 };
909
910 /**
911 * i2o_status_get - Get the status block from the I2O controller
912 * @c: I2O controller
913 *
914 * Issue a status query on the controller. This updates the attached
915 * status block. The status block could then be accessed through
916 * c->status_block.
917 *
918 * Returns 0 on success or negative error code on failure.
919 */
i2o_status_get(struct i2o_controller * c)920 int i2o_status_get(struct i2o_controller *c)
921 {
922 struct i2o_message *msg;
923 volatile u8 *status_block;
924 unsigned long timeout;
925
926 status_block = (u8 *) c->status_block.virt;
927 memset(c->status_block.virt, 0, sizeof(i2o_status_block));
928
929 msg = i2o_msg_get_wait(c, I2O_TIMEOUT_MESSAGE_GET);
930 if (IS_ERR(msg))
931 return PTR_ERR(msg);
932
933 msg->u.head[0] = cpu_to_le32(NINE_WORD_MSG_SIZE | SGL_OFFSET_0);
934 msg->u.head[1] =
935 cpu_to_le32(I2O_CMD_STATUS_GET << 24 | HOST_TID << 12 |
936 ADAPTER_TID);
937 msg->u.s.icntxt = cpu_to_le32(i2o_exec_driver.context);
938 msg->u.s.tcntxt = cpu_to_le32(0x00000000);
939 msg->body[0] = cpu_to_le32(0x00000000);
940 msg->body[1] = cpu_to_le32(0x00000000);
941 msg->body[2] = cpu_to_le32(i2o_dma_low(c->status_block.phys));
942 msg->body[3] = cpu_to_le32(i2o_dma_high(c->status_block.phys));
943 msg->body[4] = cpu_to_le32(sizeof(i2o_status_block)); /* always 88 bytes */
944
945 i2o_msg_post(c, msg);
946
947 /* Wait for a reply */
948 timeout = jiffies + I2O_TIMEOUT_STATUS_GET * HZ;
949 while (status_block[87] != 0xFF) {
950 if (time_after(jiffies, timeout)) {
951 osm_err("%s: Get status timeout.\n", c->name);
952 return -ETIMEDOUT;
953 }
954
955 schedule_timeout_uninterruptible(1);
956 }
957
958 #ifdef DEBUG
959 i2o_debug_state(c);
960 #endif
961
962 return 0;
963 }
964
965 /*
966 * i2o_hrt_get - Get the Hardware Resource Table from the I2O controller
967 * @c: I2O controller from which the HRT should be fetched
968 *
969 * The HRT contains information about possible hidden devices but is
970 * mostly useless to us.
971 *
972 * Returns 0 on success or negative error code on failure.
973 */
i2o_hrt_get(struct i2o_controller * c)974 static int i2o_hrt_get(struct i2o_controller *c)
975 {
976 int rc;
977 int i;
978 i2o_hrt *hrt = c->hrt.virt;
979 u32 size = sizeof(i2o_hrt);
980 struct device *dev = &c->pdev->dev;
981
982 for (i = 0; i < I2O_HRT_GET_TRIES; i++) {
983 struct i2o_message *msg;
984
985 msg = i2o_msg_get_wait(c, I2O_TIMEOUT_MESSAGE_GET);
986 if (IS_ERR(msg))
987 return PTR_ERR(msg);
988
989 msg->u.head[0] = cpu_to_le32(SIX_WORD_MSG_SIZE | SGL_OFFSET_4);
990 msg->u.head[1] =
991 cpu_to_le32(I2O_CMD_HRT_GET << 24 | HOST_TID << 12 |
992 ADAPTER_TID);
993 msg->body[0] = cpu_to_le32(0xd0000000 | c->hrt.len);
994 msg->body[1] = cpu_to_le32(c->hrt.phys);
995
996 rc = i2o_msg_post_wait_mem(c, msg, 20, &c->hrt);
997
998 if (rc < 0) {
999 osm_err("%s: Unable to get HRT (status=%#x)\n", c->name,
1000 -rc);
1001 return rc;
1002 }
1003
1004 size = hrt->num_entries * hrt->entry_len << 2;
1005 if (size > c->hrt.len) {
1006 if (i2o_dma_realloc(dev, &c->hrt, size))
1007 return -ENOMEM;
1008 else
1009 hrt = c->hrt.virt;
1010 } else
1011 return i2o_parse_hrt(c);
1012 }
1013
1014 osm_err("%s: Unable to get HRT after %d tries, giving up\n", c->name,
1015 I2O_HRT_GET_TRIES);
1016
1017 return -EBUSY;
1018 }
1019
1020 /**
1021 * i2o_iop_release - release the memory for a I2O controller
1022 * @dev: I2O controller which should be released
1023 *
1024 * Release the allocated memory. This function is called if refcount of
1025 * device reaches 0 automatically.
1026 */
i2o_iop_release(struct device * dev)1027 static void i2o_iop_release(struct device *dev)
1028 {
1029 struct i2o_controller *c = to_i2o_controller(dev);
1030
1031 i2o_iop_free(c);
1032 };
1033
1034 /**
1035 * i2o_iop_alloc - Allocate and initialize a i2o_controller struct
1036 *
1037 * Allocate the necessary memory for a i2o_controller struct and
1038 * initialize the lists and message mempool.
1039 *
1040 * Returns a pointer to the I2O controller or a negative error code on
1041 * failure.
1042 */
i2o_iop_alloc(void)1043 struct i2o_controller *i2o_iop_alloc(void)
1044 {
1045 static int unit; /* 0 and 1 are NULL IOP and Local Host */
1046 struct i2o_controller *c;
1047 char poolname[32];
1048
1049 c = kzalloc(sizeof(*c), GFP_KERNEL);
1050 if (!c) {
1051 osm_err("i2o: Insufficient memory to allocate a I2O controller."
1052 "\n");
1053 return ERR_PTR(-ENOMEM);
1054 }
1055
1056 c->unit = unit++;
1057 sprintf(c->name, "iop%d", c->unit);
1058
1059 snprintf(poolname, sizeof(poolname), "i2o_%s_msg_inpool", c->name);
1060 if (i2o_pool_alloc
1061 (&c->in_msg, poolname, I2O_INBOUND_MSG_FRAME_SIZE * 4 + sizeof(u32),
1062 I2O_MSG_INPOOL_MIN)) {
1063 kfree(c);
1064 return ERR_PTR(-ENOMEM);
1065 };
1066
1067 INIT_LIST_HEAD(&c->devices);
1068 spin_lock_init(&c->lock);
1069 mutex_init(&c->lct_lock);
1070
1071 device_initialize(&c->device);
1072
1073 c->device.release = &i2o_iop_release;
1074
1075 dev_set_name(&c->device, "iop%d", c->unit);
1076
1077 #if BITS_PER_LONG == 64
1078 spin_lock_init(&c->context_list_lock);
1079 atomic_set(&c->context_list_counter, 0);
1080 INIT_LIST_HEAD(&c->context_list);
1081 #endif
1082
1083 return c;
1084 };
1085
1086 /**
1087 * i2o_iop_add - Initialize the I2O controller and add him to the I2O core
1088 * @c: controller
1089 *
1090 * Initialize the I2O controller and if no error occurs add him to the I2O
1091 * core.
1092 *
1093 * Returns 0 on success or negative error code on failure.
1094 */
i2o_iop_add(struct i2o_controller * c)1095 int i2o_iop_add(struct i2o_controller *c)
1096 {
1097 int rc;
1098
1099 rc = device_add(&c->device);
1100 if (rc) {
1101 osm_err("%s: could not add controller\n", c->name);
1102 goto iop_reset;
1103 }
1104
1105 osm_info("%s: Activating I2O controller...\n", c->name);
1106 osm_info("%s: This may take a few minutes if there are many devices\n",
1107 c->name);
1108
1109 rc = i2o_iop_activate(c);
1110 if (rc) {
1111 osm_err("%s: could not activate controller\n", c->name);
1112 goto device_del;
1113 }
1114
1115 osm_debug("%s: building sys table...\n", c->name);
1116
1117 rc = i2o_systab_build();
1118 if (rc)
1119 goto device_del;
1120
1121 osm_debug("%s: online controller...\n", c->name);
1122
1123 rc = i2o_iop_online(c);
1124 if (rc)
1125 goto device_del;
1126
1127 osm_debug("%s: getting LCT...\n", c->name);
1128
1129 rc = i2o_exec_lct_get(c);
1130 if (rc)
1131 goto device_del;
1132
1133 list_add(&c->list, &i2o_controllers);
1134
1135 i2o_driver_notify_controller_add_all(c);
1136
1137 osm_info("%s: Controller added\n", c->name);
1138
1139 return 0;
1140
1141 device_del:
1142 device_del(&c->device);
1143
1144 iop_reset:
1145 i2o_iop_reset(c);
1146
1147 return rc;
1148 };
1149
1150 /**
1151 * i2o_event_register - Turn on/off event notification for a I2O device
1152 * @dev: I2O device which should receive the event registration request
1153 * @drv: driver which want to get notified
1154 * @tcntxt: transaction context to use with this notifier
1155 * @evt_mask: mask of events
1156 *
1157 * Create and posts an event registration message to the task. No reply
1158 * is waited for, or expected. If you do not want further notifications,
1159 * call the i2o_event_register again with a evt_mask of 0.
1160 *
1161 * Returns 0 on success or negative error code on failure.
1162 */
i2o_event_register(struct i2o_device * dev,struct i2o_driver * drv,int tcntxt,u32 evt_mask)1163 int i2o_event_register(struct i2o_device *dev, struct i2o_driver *drv,
1164 int tcntxt, u32 evt_mask)
1165 {
1166 struct i2o_controller *c = dev->iop;
1167 struct i2o_message *msg;
1168
1169 msg = i2o_msg_get_wait(c, I2O_TIMEOUT_MESSAGE_GET);
1170 if (IS_ERR(msg))
1171 return PTR_ERR(msg);
1172
1173 msg->u.head[0] = cpu_to_le32(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0);
1174 msg->u.head[1] =
1175 cpu_to_le32(I2O_CMD_UTIL_EVT_REGISTER << 24 | HOST_TID << 12 | dev->
1176 lct_data.tid);
1177 msg->u.s.icntxt = cpu_to_le32(drv->context);
1178 msg->u.s.tcntxt = cpu_to_le32(tcntxt);
1179 msg->body[0] = cpu_to_le32(evt_mask);
1180
1181 i2o_msg_post(c, msg);
1182
1183 return 0;
1184 };
1185
1186 /**
1187 * i2o_iop_init - I2O main initialization function
1188 *
1189 * Initialize the I2O drivers (OSM) functions, register the Executive OSM,
1190 * initialize the I2O PCI part and finally initialize I2O device stuff.
1191 *
1192 * Returns 0 on success or negative error code on failure.
1193 */
i2o_iop_init(void)1194 static int __init i2o_iop_init(void)
1195 {
1196 int rc = 0;
1197
1198 printk(KERN_INFO OSM_DESCRIPTION " v" OSM_VERSION "\n");
1199
1200 rc = i2o_driver_init();
1201 if (rc)
1202 goto exit;
1203
1204 rc = i2o_exec_init();
1205 if (rc)
1206 goto driver_exit;
1207
1208 rc = i2o_pci_init();
1209 if (rc)
1210 goto exec_exit;
1211
1212 return 0;
1213
1214 exec_exit:
1215 i2o_exec_exit();
1216
1217 driver_exit:
1218 i2o_driver_exit();
1219
1220 exit:
1221 return rc;
1222 }
1223
1224 /**
1225 * i2o_iop_exit - I2O main exit function
1226 *
1227 * Removes I2O controllers from PCI subsystem and shut down OSMs.
1228 */
i2o_iop_exit(void)1229 static void __exit i2o_iop_exit(void)
1230 {
1231 i2o_pci_exit();
1232 i2o_exec_exit();
1233 i2o_driver_exit();
1234 };
1235
1236 module_init(i2o_iop_init);
1237 module_exit(i2o_iop_exit);
1238
1239 MODULE_AUTHOR("Red Hat Software");
1240 MODULE_LICENSE("GPL");
1241 MODULE_DESCRIPTION(OSM_DESCRIPTION);
1242 MODULE_VERSION(OSM_VERSION);
1243
1244 #if BITS_PER_LONG == 64
1245 EXPORT_SYMBOL(i2o_cntxt_list_add);
1246 EXPORT_SYMBOL(i2o_cntxt_list_get);
1247 EXPORT_SYMBOL(i2o_cntxt_list_remove);
1248 EXPORT_SYMBOL(i2o_cntxt_list_get_ptr);
1249 #endif
1250 EXPORT_SYMBOL(i2o_msg_get_wait);
1251 EXPORT_SYMBOL(i2o_find_iop);
1252 EXPORT_SYMBOL(i2o_iop_find_device);
1253 EXPORT_SYMBOL(i2o_event_register);
1254 EXPORT_SYMBOL(i2o_status_get);
1255 EXPORT_SYMBOL(i2o_controllers);
1256