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1/*
2 * Executive OSM
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 Red
14 * 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 * Markus Lidel <Markus.Lidel@shadowconnect.com>:
27 * Support for sysfs included.
28 */
29
30#include <linux/module.h>
31#include <linux/i2o.h>
32#include <linux/delay.h>
33#include <linux/workqueue.h>
34#include <linux/string.h>
35#include <linux/slab.h>
36#include <linux/sched.h> /* wait_event_interruptible_timeout() needs this */
37#include <asm/param.h> /* HZ */
38#include "core.h"
39
40#define OSM_NAME "exec-osm"
41
42struct i2o_driver i2o_exec_driver;
43
44/* global wait list for POST WAIT */
45static LIST_HEAD(i2o_exec_wait_list);
46
47/* Wait struct needed for POST WAIT */
48struct i2o_exec_wait {
49 wait_queue_head_t *wq; /* Pointer to Wait queue */
50 struct i2o_dma dma; /* DMA buffers to free on failure */
51 u32 tcntxt; /* transaction context from reply */
52 int complete; /* 1 if reply received otherwise 0 */
53 u32 m; /* message id */
54 struct i2o_message *msg; /* pointer to the reply message */
55 struct list_head list; /* node in global wait list */
56 spinlock_t lock; /* lock before modifying */
57};
58
59/* Work struct needed to handle LCT NOTIFY replies */
60struct i2o_exec_lct_notify_work {
61 struct work_struct work; /* work struct */
62 struct i2o_controller *c; /* controller on which the LCT NOTIFY
63 was received */
64};
65
66/* Exec OSM class handling definition */
67static struct i2o_class_id i2o_exec_class_id[] = {
68 {I2O_CLASS_EXECUTIVE},
69 {I2O_CLASS_END}
70};
71
72/**
73 * i2o_exec_wait_alloc - Allocate a i2o_exec_wait struct an initialize it
74 *
75 * Allocate the i2o_exec_wait struct and initialize the wait.
76 *
77 * Returns i2o_exec_wait pointer on success or negative error code on
78 * failure.
79 */
80static struct i2o_exec_wait *i2o_exec_wait_alloc(void)
81{
82 struct i2o_exec_wait *wait;
83
84 wait = kzalloc(sizeof(*wait), GFP_KERNEL);
85 if (!wait)
86 return NULL;
87
88 INIT_LIST_HEAD(&wait->list);
89 spin_lock_init(&wait->lock);
90
91 return wait;
92};
93
94/**
95 * i2o_exec_wait_free - Free an i2o_exec_wait struct
96 * @wait: I2O wait data which should be cleaned up
97 */
98static void i2o_exec_wait_free(struct i2o_exec_wait *wait)
99{
100 kfree(wait);
101};
102
103/**
104 * i2o_msg_post_wait_mem - Post and wait a message with DMA buffers
105 * @c: controller
106 * @msg: message to post
107 * @timeout: time in seconds to wait
108 * @dma: i2o_dma struct of the DMA buffer to free on failure
109 *
110 * This API allows an OSM to post a message and then be told whether or
111 * not the system received a successful reply. If the message times out
112 * then the value '-ETIMEDOUT' is returned. This is a special case. In
113 * this situation the message may (should) complete at an indefinite time
114 * in the future. When it completes it will use the memory buffer
115 * attached to the request. If -ETIMEDOUT is returned then the memory
116 * buffer must not be freed. Instead the event completion will free them
117 * for you. In all other cases the buffer are your problem.
118 *
119 * Returns 0 on success, negative error code on timeout or positive error
120 * code from reply.
121 */
122int i2o_msg_post_wait_mem(struct i2o_controller *c, struct i2o_message *msg,
123 unsigned long timeout, struct i2o_dma *dma)
124{
125 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq);
126 struct i2o_exec_wait *wait;
127 static u32 tcntxt = 0x80000000;
128 unsigned long flags;
129 int rc = 0;
130
131 wait = i2o_exec_wait_alloc();
132 if (!wait) {
133 i2o_msg_nop(c, msg);
134 return -ENOMEM;
135 }
136
137 if (tcntxt == 0xffffffff)
138 tcntxt = 0x80000000;
139
140 if (dma)
141 wait->dma = *dma;
142
143 /*
144 * Fill in the message initiator context and transaction context.
145 * We will only use transaction contexts >= 0x80000000 for POST WAIT,
146 * so we could find a POST WAIT reply easier in the reply handler.
147 */
148 msg->u.s.icntxt = cpu_to_le32(i2o_exec_driver.context);
149 wait->tcntxt = tcntxt++;
150 msg->u.s.tcntxt = cpu_to_le32(wait->tcntxt);
151
152 wait->wq = &wq;
153 /*
154 * we add elements to the head, because if a entry in the list will
155 * never be removed, we have to iterate over it every time
156 */
157 list_add(&wait->list, &i2o_exec_wait_list);
158
159 /*
160 * Post the message to the controller. At some point later it will
161 * return. If we time out before it returns then complete will be zero.
162 */
163 i2o_msg_post(c, msg);
164
165 wait_event_interruptible_timeout(wq, wait->complete, timeout * HZ);
166
167 spin_lock_irqsave(&wait->lock, flags);
168
169 wait->wq = NULL;
170
171 if (wait->complete)
172 rc = le32_to_cpu(wait->msg->body[0]) >> 24;
173 else {
174 /*
175 * We cannot remove it now. This is important. When it does
176 * terminate (which it must do if the controller has not
177 * died...) then it will otherwise scribble on stuff.
178 *
179 * FIXME: try abort message
180 */
181 if (dma)
182 dma->virt = NULL;
183
184 rc = -ETIMEDOUT;
185 }
186
187 spin_unlock_irqrestore(&wait->lock, flags);
188
189 if (rc != -ETIMEDOUT) {
190 i2o_flush_reply(c, wait->m);
191 i2o_exec_wait_free(wait);
192 }
193
194 return rc;
195};
196
197/**
198 * i2o_msg_post_wait_complete - Reply to a i2o_msg_post request from IOP
199 * @c: I2O controller which answers
200 * @m: message id
201 * @msg: pointer to the I2O reply message
202 * @context: transaction context of request
203 *
204 * This function is called in interrupt context only. If the reply reached
205 * before the timeout, the i2o_exec_wait struct is filled with the message
206 * and the task will be waked up. The task is now responsible for returning
207 * the message m back to the controller! If the message reaches us after
208 * the timeout clean up the i2o_exec_wait struct (including allocated
209 * DMA buffer).
210 *
211 * Return 0 on success and if the message m should not be given back to the
212 * I2O controller, or >0 on success and if the message should be given back
213 * afterwords. Returns negative error code on failure. In this case the
214 * message must also be given back to the controller.
215 */
216static int i2o_msg_post_wait_complete(struct i2o_controller *c, u32 m,
217 struct i2o_message *msg, u32 context)
218{
219 struct i2o_exec_wait *wait, *tmp;
220 unsigned long flags;
221 int rc = 1;
222
223 /*
224 * We need to search through the i2o_exec_wait_list to see if the given
225 * message is still outstanding. If not, it means that the IOP took
226 * longer to respond to the message than we had allowed and timer has
227 * already expired. Not much we can do about that except log it for
228 * debug purposes, increase timeout, and recompile.
229 */
230 list_for_each_entry_safe(wait, tmp, &i2o_exec_wait_list, list) {
231 if (wait->tcntxt == context) {
232 spin_lock_irqsave(&wait->lock, flags);
233
234 list_del(&wait->list);
235
236 wait->m = m;
237 wait->msg = msg;
238 wait->complete = 1;
239
240 if (wait->wq)
241 rc = 0;
242 else
243 rc = -1;
244
245 spin_unlock_irqrestore(&wait->lock, flags);
246
247 if (rc) {
248 struct device *dev;
249
250 dev = &c->pdev->dev;
251
252 pr_debug("%s: timedout reply received!\n",
253 c->name);
254 i2o_dma_free(dev, &wait->dma);
255 i2o_exec_wait_free(wait);
256 } else
257 wake_up_interruptible(wait->wq);
258
259 return rc;
260 }
261 }
262
263 osm_warn("%s: Bogus reply in POST WAIT (tr-context: %08x)!\n", c->name,
264 context);
265
266 return -1;
267};
268
269/**
270 * i2o_exec_show_vendor_id - Displays Vendor ID of controller
271 * @d: device of which the Vendor ID should be displayed
272 * @attr: device_attribute to display
273 * @buf: buffer into which the Vendor ID should be printed
274 *
275 * Returns number of bytes printed into buffer.
276 */
277static ssize_t i2o_exec_show_vendor_id(struct device *d,
278 struct device_attribute *attr, char *buf)
279{
280 struct i2o_device *dev = to_i2o_device(d);
281 u16 id;
282
283 if (!i2o_parm_field_get(dev, 0x0000, 0, &id, 2)) {
284 sprintf(buf, "0x%04x", le16_to_cpu(id));
285 return strlen(buf) + 1;
286 }
287
288 return 0;
289};
290
291/**
292 * i2o_exec_show_product_id - Displays Product ID of controller
293 * @d: device of which the Product ID should be displayed
294 * @attr: device_attribute to display
295 * @buf: buffer into which the Product ID should be printed
296 *
297 * Returns number of bytes printed into buffer.
298 */
299static ssize_t i2o_exec_show_product_id(struct device *d,
300 struct device_attribute *attr,
301 char *buf)
302{
303 struct i2o_device *dev = to_i2o_device(d);
304 u16 id;
305
306 if (!i2o_parm_field_get(dev, 0x0000, 1, &id, 2)) {
307 sprintf(buf, "0x%04x", le16_to_cpu(id));
308 return strlen(buf) + 1;
309 }
310
311 return 0;
312};
313
314/* Exec-OSM device attributes */
315static DEVICE_ATTR(vendor_id, S_IRUGO, i2o_exec_show_vendor_id, NULL);
316static DEVICE_ATTR(product_id, S_IRUGO, i2o_exec_show_product_id, NULL);
317
318/**
319 * i2o_exec_probe - Called if a new I2O device (executive class) appears
320 * @dev: I2O device which should be probed
321 *
322 * Registers event notification for every event from Executive device. The
323 * return is always 0, because we want all devices of class Executive.
324 *
325 * Returns 0 on success.
326 */
327static int i2o_exec_probe(struct device *dev)
328{
329 struct i2o_device *i2o_dev = to_i2o_device(dev);
330 int rc;
331
332 rc = i2o_event_register(i2o_dev, &i2o_exec_driver, 0, 0xffffffff);
333 if (rc) goto err_out;
334
335 rc = device_create_file(dev, &dev_attr_vendor_id);
336 if (rc) goto err_evtreg;
337 rc = device_create_file(dev, &dev_attr_product_id);
338 if (rc) goto err_vid;
339
340 i2o_dev->iop->exec = i2o_dev;
341
342 return 0;
343
344err_vid:
345 device_remove_file(dev, &dev_attr_vendor_id);
346err_evtreg:
347 i2o_event_register(to_i2o_device(dev), &i2o_exec_driver, 0, 0);
348err_out:
349 return rc;
350};
351
352/**
353 * i2o_exec_remove - Called on I2O device removal
354 * @dev: I2O device which was removed
355 *
356 * Unregisters event notification from Executive I2O device.
357 *
358 * Returns 0 on success.
359 */
360static int i2o_exec_remove(struct device *dev)
361{
362 device_remove_file(dev, &dev_attr_product_id);
363 device_remove_file(dev, &dev_attr_vendor_id);
364
365 i2o_event_register(to_i2o_device(dev), &i2o_exec_driver, 0, 0);
366
367 return 0;
368};
369
370#ifdef CONFIG_I2O_LCT_NOTIFY_ON_CHANGES
371/**
372 * i2o_exec_lct_notify - Send a asynchronus LCT NOTIFY request
373 * @c: I2O controller to which the request should be send
374 * @change_ind: change indicator
375 *
376 * This function sends a LCT NOTIFY request to the I2O controller with
377 * the change indicator change_ind. If the change_ind == 0 the controller
378 * replies immediately after the request. If change_ind > 0 the reply is
379 * send after change indicator of the LCT is > change_ind.
380 */
381static int i2o_exec_lct_notify(struct i2o_controller *c, u32 change_ind)
382{
383 i2o_status_block *sb = c->status_block.virt;
384 struct device *dev;
385 struct i2o_message *msg;
386
387 mutex_lock(&c->lct_lock);
388
389 dev = &c->pdev->dev;
390
391 if (i2o_dma_realloc(dev, &c->dlct,
392 le32_to_cpu(sb->expected_lct_size))) {
393 mutex_unlock(&c->lct_lock);
394 return -ENOMEM;
395 }
396
397 msg = i2o_msg_get_wait(c, I2O_TIMEOUT_MESSAGE_GET);
398 if (IS_ERR(msg)) {
399 mutex_unlock(&c->lct_lock);
400 return PTR_ERR(msg);
401 }
402
403 msg->u.head[0] = cpu_to_le32(EIGHT_WORD_MSG_SIZE | SGL_OFFSET_6);
404 msg->u.head[1] = cpu_to_le32(I2O_CMD_LCT_NOTIFY << 24 | HOST_TID << 12 |
405 ADAPTER_TID);
406 msg->u.s.icntxt = cpu_to_le32(i2o_exec_driver.context);
407 msg->u.s.tcntxt = cpu_to_le32(0x00000000);
408 msg->body[0] = cpu_to_le32(0xffffffff);
409 msg->body[1] = cpu_to_le32(change_ind);
410 msg->body[2] = cpu_to_le32(0xd0000000 | c->dlct.len);
411 msg->body[3] = cpu_to_le32(c->dlct.phys);
412
413 i2o_msg_post(c, msg);
414
415 mutex_unlock(&c->lct_lock);
416
417 return 0;
418}
419#endif
420
421/**
422 * i2o_exec_lct_modified - Called on LCT NOTIFY reply
423 * @_work: work struct for a specific controller
424 *
425 * This function handles asynchronus LCT NOTIFY replies. It parses the
426 * new LCT and if the buffer for the LCT was to small sends a LCT NOTIFY
427 * again, otherwise send LCT NOTIFY to get informed on next LCT change.
428 */
429static void i2o_exec_lct_modified(struct work_struct *_work)
430{
431 struct i2o_exec_lct_notify_work *work =
432 container_of(_work, struct i2o_exec_lct_notify_work, work);
433 u32 change_ind = 0;
434 struct i2o_controller *c = work->c;
435
436 kfree(work);
437
438 if (i2o_device_parse_lct(c) != -EAGAIN)
439 change_ind = c->lct->change_ind + 1;
440
441#ifdef CONFIG_I2O_LCT_NOTIFY_ON_CHANGES
442 i2o_exec_lct_notify(c, change_ind);
443#endif
444};
445
446/**
447 * i2o_exec_reply - I2O Executive reply handler
448 * @c: I2O controller from which the reply comes
449 * @m: message id
450 * @msg: pointer to the I2O reply message
451 *
452 * This function is always called from interrupt context. If a POST WAIT
453 * reply was received, pass it to the complete function. If a LCT NOTIFY
454 * reply was received, a new event is created to handle the update.
455 *
456 * Returns 0 on success and if the reply should not be flushed or > 0
457 * on success and if the reply should be flushed. Returns negative error
458 * code on failure and if the reply should be flushed.
459 */
460static int i2o_exec_reply(struct i2o_controller *c, u32 m,
461 struct i2o_message *msg)
462{
463 u32 context;
464
465 if (le32_to_cpu(msg->u.head[0]) & MSG_FAIL) {
466 struct i2o_message __iomem *pmsg;
467 u32 pm;
468
469 /*
470 * If Fail bit is set we must take the transaction context of
471 * the preserved message to find the right request again.
472 */
473
474 pm = le32_to_cpu(msg->body[3]);
475 pmsg = i2o_msg_in_to_virt(c, pm);
476 context = readl(&pmsg->u.s.tcntxt);
477
478 i2o_report_status(KERN_INFO, "i2o_core", msg);
479
480 /* Release the preserved msg */
481 i2o_msg_nop_mfa(c, pm);
482 } else
483 context = le32_to_cpu(msg->u.s.tcntxt);
484
485 if (context & 0x80000000)
486 return i2o_msg_post_wait_complete(c, m, msg, context);
487
488 if ((le32_to_cpu(msg->u.head[1]) >> 24) == I2O_CMD_LCT_NOTIFY) {
489 struct i2o_exec_lct_notify_work *work;
490
491 pr_debug("%s: LCT notify received\n", c->name);
492
493 work = kmalloc(sizeof(*work), GFP_ATOMIC);
494 if (!work)
495 return -ENOMEM;
496
497 work->c = c;
498
499 INIT_WORK(&work->work, i2o_exec_lct_modified);
500 queue_work(i2o_exec_driver.event_queue, &work->work);
501 return 1;
502 }
503
504 /*
505 * If this happens, we want to dump the message to the syslog so
506 * it can be sent back to the card manufacturer by the end user
507 * to aid in debugging.
508 *
509 */
510 printk(KERN_WARNING "%s: Unsolicited message reply sent to core!"
511 "Message dumped to syslog\n", c->name);
512 i2o_dump_message(msg);
513
514 return -EFAULT;
515}
516
517/**
518 * i2o_exec_event - Event handling function
519 * @work: Work item in occurring event
520 *
521 * Handles events send by the Executive device. At the moment does not do
522 * anything useful.
523 */
524static void i2o_exec_event(struct work_struct *work)
525{
526 struct i2o_event *evt = container_of(work, struct i2o_event, work);
527
528 if (likely(evt->i2o_dev))
529 osm_debug("Event received from device: %d\n",
530 evt->i2o_dev->lct_data.tid);
531 kfree(evt);
532};
533
534/**
535 * i2o_exec_lct_get - Get the IOP's Logical Configuration Table
536 * @c: I2O controller from which the LCT should be fetched
537 *
538 * Send a LCT NOTIFY request to the controller, and wait
539 * I2O_TIMEOUT_LCT_GET seconds until arrival of response. If the LCT is
540 * to large, retry it.
541 *
542 * Returns 0 on success or negative error code on failure.
543 */
544int i2o_exec_lct_get(struct i2o_controller *c)
545{
546 struct i2o_message *msg;
547 int i = 0;
548 int rc = -EAGAIN;
549
550 for (i = 1; i <= I2O_LCT_GET_TRIES; i++) {
551 msg = i2o_msg_get_wait(c, I2O_TIMEOUT_MESSAGE_GET);
552 if (IS_ERR(msg))
553 return PTR_ERR(msg);
554
555 msg->u.head[0] =
556 cpu_to_le32(EIGHT_WORD_MSG_SIZE | SGL_OFFSET_6);
557 msg->u.head[1] =
558 cpu_to_le32(I2O_CMD_LCT_NOTIFY << 24 | HOST_TID << 12 |
559 ADAPTER_TID);
560 msg->body[0] = cpu_to_le32(0xffffffff);
561 msg->body[1] = cpu_to_le32(0x00000000);
562 msg->body[2] = cpu_to_le32(0xd0000000 | c->dlct.len);
563 msg->body[3] = cpu_to_le32(c->dlct.phys);
564
565 rc = i2o_msg_post_wait(c, msg, I2O_TIMEOUT_LCT_GET);
566 if (rc < 0)
567 break;
568
569 rc = i2o_device_parse_lct(c);
570 if (rc != -EAGAIN)
571 break;
572 }
573
574 return rc;
575}
576
577/* Exec OSM driver struct */
578struct i2o_driver i2o_exec_driver = {
579 .name = OSM_NAME,
580 .reply = i2o_exec_reply,
581 .event = i2o_exec_event,
582 .classes = i2o_exec_class_id,
583 .driver = {
584 .probe = i2o_exec_probe,
585 .remove = i2o_exec_remove,
586 },
587};
588
589/**
590 * i2o_exec_init - Registers the Exec OSM
591 *
592 * Registers the Exec OSM in the I2O core.
593 *
594 * Returns 0 on success or negative error code on failure.
595 */
596int __init i2o_exec_init(void)
597{
598 return i2o_driver_register(&i2o_exec_driver);
599};
600
601/**
602 * i2o_exec_exit - Removes the Exec OSM
603 *
604 * Unregisters the Exec OSM from the I2O core.
605 */
606void i2o_exec_exit(void)
607{
608 i2o_driver_unregister(&i2o_exec_driver);
609};
610
611EXPORT_SYMBOL(i2o_msg_post_wait_mem);
612EXPORT_SYMBOL(i2o_exec_lct_get);