4 * Copyright (C) 1999-2002 Red Hat Software
6 * Written by Alan Cox, Building Number Three Ltd
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.
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
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@redhat.com>:
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.
30 #include <linux/module.h>
31 #include <linux/i2o.h>
32 #include <linux/delay.h>
34 #define OSM_NAME "exec-osm"
36 struct i2o_driver i2o_exec_driver;
38 static int i2o_exec_lct_notify(struct i2o_controller *c, u32 change_ind);
40 /* Module internal functions from other sources */
41 extern int i2o_device_parse_lct(struct i2o_controller *);
43 /* global wait list for POST WAIT */
44 static LIST_HEAD(i2o_exec_wait_list);
46 /* Wait struct needed for POST WAIT */
47 struct i2o_exec_wait {
48 wait_queue_head_t *wq; /* Pointer to Wait queue */
49 struct i2o_dma dma; /* DMA buffers to free on failure */
50 u32 tcntxt; /* transaction context from reply */
51 int complete; /* 1 if reply received otherwise 0 */
52 u32 m; /* message id */
53 struct i2o_message __iomem *msg; /* pointer to the reply message */
54 struct list_head list; /* node in global wait list */
57 /* Exec OSM class handling definition */
58 static struct i2o_class_id i2o_exec_class_id[] = {
59 {I2O_CLASS_EXECUTIVE},
64 * i2o_exec_wait_alloc - Allocate a i2o_exec_wait struct an initialize it
66 * Allocate the i2o_exec_wait struct and initialize the wait.
68 * Returns i2o_exec_wait pointer on success or negative error code on
71 static struct i2o_exec_wait *i2o_exec_wait_alloc(void)
73 struct i2o_exec_wait *wait;
75 wait = kmalloc(sizeof(*wait), GFP_KERNEL);
77 return ERR_PTR(-ENOMEM);
79 memset(wait, 0, sizeof(*wait));
81 INIT_LIST_HEAD(&wait->list);
87 * i2o_exec_wait_free - Free a i2o_exec_wait struct
88 * @i2o_exec_wait: I2O wait data which should be cleaned up
90 static void i2o_exec_wait_free(struct i2o_exec_wait *wait)
96 * i2o_msg_post_wait_mem - Post and wait a message with DMA buffers
99 * @timeout: time in seconds to wait
100 * @dma: i2o_dma struct of the DMA buffer to free on failure
102 * This API allows an OSM to post a message and then be told whether or
103 * not the system received a successful reply. If the message times out
104 * then the value '-ETIMEDOUT' is returned. This is a special case. In
105 * this situation the message may (should) complete at an indefinite time
106 * in the future. When it completes it will use the memory buffer
107 * attached to the request. If -ETIMEDOUT is returned then the memory
108 * buffer must not be freed. Instead the event completion will free them
109 * for you. In all other cases the buffer are your problem.
111 * Returns 0 on success or negative error code on failure.
113 int i2o_msg_post_wait_mem(struct i2o_controller *c, u32 m, unsigned long
114 timeout, struct i2o_dma *dma)
116 DECLARE_WAIT_QUEUE_HEAD(wq);
117 struct i2o_exec_wait *wait;
118 static u32 tcntxt = 0x80000000;
119 struct i2o_message __iomem *msg = c->in_queue.virt + m;
122 wait = i2o_exec_wait_alloc();
126 if (tcntxt == 0xffffffff)
133 * Fill in the message initiator context and transaction context.
134 * We will only use transaction contexts >= 0x80000000 for POST WAIT,
135 * so we could find a POST WAIT reply easier in the reply handler.
137 writel(i2o_exec_driver.context, &msg->u.s.icntxt);
138 wait->tcntxt = tcntxt++;
139 writel(wait->tcntxt, &msg->u.s.tcntxt);
142 * Post the message to the controller. At some point later it will
143 * return. If we time out before it returns then complete will be zero.
147 if (!wait->complete) {
150 * we add elements add the head, because if a entry in the list
151 * will never be removed, we have to iterate over it every time
153 list_add(&wait->list, &i2o_exec_wait_list);
155 wait_event_interruptible_timeout(wq, wait->complete,
163 if (wait->complete) {
164 if (readl(&wait->msg->body[0]) >> 24)
165 rc = readl(&wait->msg->body[0]) & 0xff;
166 i2o_flush_reply(c, wait->m);
167 i2o_exec_wait_free(wait);
170 * We cannot remove it now. This is important. When it does
171 * terminate (which it must do if the controller has not
172 * died...) then it will otherwise scribble on stuff.
174 * FIXME: try abort message
186 * i2o_msg_post_wait_complete - Reply to a i2o_msg_post request from IOP
187 * @c: I2O controller which answers
189 * @msg: pointer to the I2O reply message
191 * This function is called in interrupt context only. If the reply reached
192 * before the timeout, the i2o_exec_wait struct is filled with the message
193 * and the task will be waked up. The task is now responsible for returning
194 * the message m back to the controller! If the message reaches us after
195 * the timeout clean up the i2o_exec_wait struct (including allocated
198 * Return 0 on success and if the message m should not be given back to the
199 * I2O controller, or >0 on success and if the message should be given back
200 * afterwords. Returns negative error code on failure. In this case the
201 * message must also be given back to the controller.
203 static int i2o_msg_post_wait_complete(struct i2o_controller *c, u32 m,
204 struct i2o_message __iomem *msg)
206 struct i2o_exec_wait *wait, *tmp;
207 static spinlock_t lock = SPIN_LOCK_UNLOCKED;
211 context = readl(&msg->u.s.tcntxt);
214 * We need to search through the i2o_exec_wait_list to see if the given
215 * message is still outstanding. If not, it means that the IOP took
216 * longer to respond to the message than we had allowed and timer has
217 * already expired. Not much we can do about that except log it for
218 * debug purposes, increase timeout, and recompile.
221 list_for_each_entry_safe(wait, tmp, &i2o_exec_wait_list, list) {
222 if (wait->tcntxt == context) {
223 list_del(&wait->list);
232 wake_up_interruptible(wait->wq);
239 pr_debug("%s: timedout reply received!\n",
241 i2o_dma_free(dev, &wait->dma);
242 i2o_exec_wait_free(wait);
254 pr_debug("%s: Bogus reply in POST WAIT (tr-context: %08x)!\n", c->name,
261 * i2o_exec_probe - Called if a new I2O device (executive class) appears
262 * @dev: I2O device which should be probed
264 * Registers event notification for every event from Executive device. The
265 * return is always 0, because we want all devices of class Executive.
267 * Returns 0 on success.
269 static int i2o_exec_probe(struct device *dev)
271 struct i2o_device *i2o_dev = to_i2o_device(dev);
273 i2o_event_register(i2o_dev, &i2o_exec_driver, 0, 0xffffffff);
275 i2o_dev->iop->exec = i2o_dev;
281 * i2o_exec_remove - Called on I2O device removal
282 * @dev: I2O device which was removed
284 * Unregisters event notification from Executive I2O device.
286 * Returns 0 on success.
288 static int i2o_exec_remove(struct device *dev)
290 i2o_event_register(to_i2o_device(dev), &i2o_exec_driver, 0, 0);
296 * i2o_exec_lct_modified - Called on LCT NOTIFY reply
297 * @c: I2O controller on which the LCT has modified
299 * This function handles asynchronus LCT NOTIFY replies. It parses the
300 * new LCT and if the buffer for the LCT was to small sends a LCT NOTIFY
303 static void i2o_exec_lct_modified(struct i2o_controller *c)
305 if (i2o_device_parse_lct(c) == -EAGAIN)
306 i2o_exec_lct_notify(c, 0);
310 * i2o_exec_reply - I2O Executive reply handler
311 * @c: I2O controller from which the reply comes
313 * @msg: pointer to the I2O reply message
315 * This function is always called from interrupt context. If a POST WAIT
316 * reply was received, pass it to the complete function. If a LCT NOTIFY
317 * reply was received, a new event is created to handle the update.
319 * Returns 0 on success and if the reply should not be flushed or > 0
320 * on success and if the reply should be flushed. Returns negative error
321 * code on failure and if the reply should be flushed.
323 static int i2o_exec_reply(struct i2o_controller *c, u32 m,
324 struct i2o_message *msg)
326 if (le32_to_cpu(msg->u.head[0]) & MSG_FAIL) { // Fail bit is set
327 struct i2o_message __iomem *pmsg; /* preserved message */
330 pm = le32_to_cpu(msg->body[3]);
332 pmsg = i2o_msg_in_to_virt(c, pm);
334 i2o_report_status(KERN_INFO, "i2o_core", msg);
336 /* Release the preserved msg by resubmitting it as a NOP */
339 /* If reply to i2o_post_wait failed, return causes a timeout */
343 if (le32_to_cpu(msg->u.s.tcntxt) & 0x80000000)
344 return i2o_msg_post_wait_complete(c, m, msg);
346 if ((le32_to_cpu(msg->u.head[1]) >> 24) == I2O_CMD_LCT_NOTIFY) {
347 struct work_struct *work;
349 pr_debug("%s: LCT notify received\n", c->name);
351 work = kmalloc(sizeof(*work), GFP_ATOMIC);
355 INIT_WORK(work, (void (*)(void *))i2o_exec_lct_modified, c);
356 queue_work(i2o_exec_driver.event_queue, work);
361 * If this happens, we want to dump the message to the syslog so
362 * it can be sent back to the card manufacturer by the end user
363 * to aid in debugging.
366 printk(KERN_WARNING "%s: Unsolicited message reply sent to core!"
367 "Message dumped to syslog\n", c->name);
368 i2o_dump_message(msg);
374 * i2o_exec_event - Event handling function
375 * @evt: Event which occurs
377 * Handles events send by the Executive device. At the moment does not do
380 static void i2o_exec_event(struct i2o_event *evt)
382 if(likely(evt->i2o_dev))
383 osm_info("Event received from device: %d\n",
384 evt->i2o_dev->lct_data.tid);
389 * i2o_exec_lct_get - Get the IOP's Logical Configuration Table
390 * @c: I2O controller from which the LCT should be fetched
392 * Send a LCT NOTIFY request to the controller, and wait
393 * I2O_TIMEOUT_LCT_GET seconds until arrival of response. If the LCT is
394 * to large, retry it.
396 * Returns 0 on success or negative error code on failure.
398 int i2o_exec_lct_get(struct i2o_controller *c)
400 struct i2o_message __iomem *msg;
405 for (i = 1; i <= I2O_LCT_GET_TRIES; i++) {
406 m = i2o_msg_get_wait(c, &msg, I2O_TIMEOUT_MESSAGE_GET);
407 if (m == I2O_QUEUE_EMPTY)
410 writel(EIGHT_WORD_MSG_SIZE | SGL_OFFSET_6, &msg->u.head[0]);
411 writel(I2O_CMD_LCT_NOTIFY << 24 | HOST_TID << 12 | ADAPTER_TID,
413 writel(0xffffffff, &msg->body[0]);
414 writel(0x00000000, &msg->body[1]);
415 writel(0xd0000000 | c->dlct.len, &msg->body[2]);
416 writel(c->dlct.phys, &msg->body[3]);
418 rc = i2o_msg_post_wait(c, m, I2O_TIMEOUT_LCT_GET);
422 rc = i2o_device_parse_lct(c);
431 * i2o_exec_lct_notify - Send a asynchronus LCT NOTIFY request
432 * @c: I2O controller to which the request should be send
433 * @change_ind: change indicator
435 * This function sends a LCT NOTIFY request to the I2O controller with
436 * the change indicator change_ind. If the change_ind == 0 the controller
437 * replies immediately after the request. If change_ind > 0 the reply is
438 * send after change indicator of the LCT is > change_ind.
440 static int i2o_exec_lct_notify(struct i2o_controller *c, u32 change_ind)
442 i2o_status_block *sb = c->status_block.virt;
444 struct i2o_message __iomem *msg;
449 if (i2o_dma_realloc(dev, &c->dlct, sb->expected_lct_size, GFP_KERNEL))
452 m = i2o_msg_get_wait(c, &msg, I2O_TIMEOUT_MESSAGE_GET);
453 if (m == I2O_QUEUE_EMPTY)
456 writel(EIGHT_WORD_MSG_SIZE | SGL_OFFSET_6, &msg->u.head[0]);
457 writel(I2O_CMD_LCT_NOTIFY << 24 | HOST_TID << 12 | ADAPTER_TID,
459 writel(i2o_exec_driver.context, &msg->u.s.icntxt);
460 writel(0, &msg->u.s.tcntxt); /* FIXME */
461 writel(0xffffffff, &msg->body[0]);
462 writel(change_ind, &msg->body[1]);
463 writel(0xd0000000 | c->dlct.len, &msg->body[2]);
464 writel(c->dlct.phys, &msg->body[3]);
471 /* Exec OSM driver struct */
472 struct i2o_driver i2o_exec_driver = {
474 .reply = i2o_exec_reply,
475 .event = i2o_exec_event,
476 .classes = i2o_exec_class_id,
478 .probe = i2o_exec_probe,
479 .remove = i2o_exec_remove,
484 * i2o_exec_init - Registers the Exec OSM
486 * Registers the Exec OSM in the I2O core.
488 * Returns 0 on success or negative error code on failure.
490 int __init i2o_exec_init(void)
492 return i2o_driver_register(&i2o_exec_driver);
496 * i2o_exec_exit - Removes the Exec OSM
498 * Unregisters the Exec OSM from the I2O core.
500 void __exit i2o_exec_exit(void)
502 i2o_driver_unregister(&i2o_exec_driver);
505 EXPORT_SYMBOL(i2o_msg_post_wait_mem);
506 EXPORT_SYMBOL(i2o_exec_lct_get);