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1 /*
2  *	Functions to handle I2O devices
3  *
4  *	Copyright (C) 2004	Markus Lidel <Markus.Lidel@shadowconnect.com>
5  *
6  *	This program is free software; you can redistribute it and/or modify it
7  *	under the terms of the GNU General Public License as published by the
8  *	Free Software Foundation; either version 2 of the License, or (at your
9  *	option) any later version.
10  *
11  *	Fixes/additions:
12  *		Markus Lidel <Markus.Lidel@shadowconnect.com>
13  *			initial version.
14  */
15 
16 #include <linux/module.h>
17 #include <linux/i2o.h>
18 #include <linux/delay.h>
19 #include <linux/string.h>
20 #include <linux/slab.h>
21 #include "core.h"
22 
23 /**
24  *	i2o_device_issue_claim - claim or release a device
25  *	@dev: I2O device to claim or release
26  *	@cmd: claim or release command
27  *	@type: type of claim
28  *
29  *	Issue I2O UTIL_CLAIM or UTIL_RELEASE messages. The message to be sent
30  *	is set by cmd. dev is the I2O device which should be claim or
31  *	released and the type is the claim type (see the I2O spec).
32  *
33  *	Returs 0 on success or negative error code on failure.
34  */
i2o_device_issue_claim(struct i2o_device * dev,u32 cmd,u32 type)35 static inline int i2o_device_issue_claim(struct i2o_device *dev, u32 cmd,
36 					 u32 type)
37 {
38 	struct i2o_message *msg;
39 
40 	msg = i2o_msg_get_wait(dev->iop, I2O_TIMEOUT_MESSAGE_GET);
41 	if (IS_ERR(msg))
42 		return PTR_ERR(msg);
43 
44 	msg->u.head[0] = cpu_to_le32(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0);
45 	msg->u.head[1] =
46 	    cpu_to_le32(cmd << 24 | HOST_TID << 12 | dev->lct_data.tid);
47 	msg->body[0] = cpu_to_le32(type);
48 
49 	return i2o_msg_post_wait(dev->iop, msg, 60);
50 }
51 
52 /**
53  *	i2o_device_claim - claim a device for use by an OSM
54  *	@dev: I2O device to claim
55  *
56  *	Do the leg work to assign a device to a given OSM. If the claim succeeds,
57  *	the owner is the primary. If the attempt fails a negative errno code
58  *	is returned. On success zero is returned.
59  */
i2o_device_claim(struct i2o_device * dev)60 int i2o_device_claim(struct i2o_device *dev)
61 {
62 	int rc = 0;
63 
64 	mutex_lock(&dev->lock);
65 
66 	rc = i2o_device_issue_claim(dev, I2O_CMD_UTIL_CLAIM, I2O_CLAIM_PRIMARY);
67 	if (!rc)
68 		pr_debug("i2o: claim of device %d succeeded\n",
69 			 dev->lct_data.tid);
70 	else
71 		pr_debug("i2o: claim of device %d failed %d\n",
72 			 dev->lct_data.tid, rc);
73 
74 	mutex_unlock(&dev->lock);
75 
76 	return rc;
77 }
78 
79 /**
80  *	i2o_device_claim_release - release a device that the OSM is using
81  *	@dev: device to release
82  *
83  *	Drop a claim by an OSM on a given I2O device.
84  *
85  *	AC - some devices seem to want to refuse an unclaim until they have
86  *	finished internal processing. It makes sense since you don't want a
87  *	new device to go reconfiguring the entire system until you are done.
88  *	Thus we are prepared to wait briefly.
89  *
90  *	Returns 0 on success or negative error code on failure.
91  */
i2o_device_claim_release(struct i2o_device * dev)92 int i2o_device_claim_release(struct i2o_device *dev)
93 {
94 	int tries;
95 	int rc = 0;
96 
97 	mutex_lock(&dev->lock);
98 
99 	/*
100 	 *      If the controller takes a nonblocking approach to
101 	 *      releases we have to sleep/poll for a few times.
102 	 */
103 	for (tries = 0; tries < 10; tries++) {
104 		rc = i2o_device_issue_claim(dev, I2O_CMD_UTIL_RELEASE,
105 					    I2O_CLAIM_PRIMARY);
106 		if (!rc)
107 			break;
108 
109 		ssleep(1);
110 	}
111 
112 	if (!rc)
113 		pr_debug("i2o: claim release of device %d succeeded\n",
114 			 dev->lct_data.tid);
115 	else
116 		pr_debug("i2o: claim release of device %d failed %d\n",
117 			 dev->lct_data.tid, rc);
118 
119 	mutex_unlock(&dev->lock);
120 
121 	return rc;
122 }
123 
124 /**
125  *	i2o_device_release - release the memory for a I2O device
126  *	@dev: I2O device which should be released
127  *
128  *	Release the allocated memory. This function is called if refcount of
129  *	device reaches 0 automatically.
130  */
i2o_device_release(struct device * dev)131 static void i2o_device_release(struct device *dev)
132 {
133 	struct i2o_device *i2o_dev = to_i2o_device(dev);
134 
135 	pr_debug("i2o: device %s released\n", dev_name(dev));
136 
137 	kfree(i2o_dev);
138 }
139 
140 /**
141  *	class_id_show - Displays class id of I2O device
142  *	@dev: device of which the class id should be displayed
143  *	@attr: pointer to device attribute
144  *	@buf: buffer into which the class id should be printed
145  *
146  *	Returns the number of bytes which are printed into the buffer.
147  */
class_id_show(struct device * dev,struct device_attribute * attr,char * buf)148 static ssize_t class_id_show(struct device *dev, struct device_attribute *attr,
149 			     char *buf)
150 {
151 	struct i2o_device *i2o_dev = to_i2o_device(dev);
152 
153 	sprintf(buf, "0x%03x\n", i2o_dev->lct_data.class_id);
154 	return strlen(buf) + 1;
155 }
156 static DEVICE_ATTR_RO(class_id);
157 
158 /**
159  *	tid_show - Displays TID of I2O device
160  *	@dev: device of which the TID should be displayed
161  *	@attr: pointer to device attribute
162  *	@buf: buffer into which the TID should be printed
163  *
164  *	Returns the number of bytes which are printed into the buffer.
165  */
tid_show(struct device * dev,struct device_attribute * attr,char * buf)166 static ssize_t tid_show(struct device *dev, struct device_attribute *attr,
167 			char *buf)
168 {
169 	struct i2o_device *i2o_dev = to_i2o_device(dev);
170 
171 	sprintf(buf, "0x%03x\n", i2o_dev->lct_data.tid);
172 	return strlen(buf) + 1;
173 }
174 static DEVICE_ATTR_RO(tid);
175 
176 /* I2O device attributes */
177 static struct attribute *i2o_device_attrs[] = {
178 	&dev_attr_class_id.attr,
179 	&dev_attr_tid.attr,
180 	NULL,
181 };
182 
183 static const struct attribute_group i2o_device_group = {
184 	.attrs = i2o_device_attrs,
185 };
186 
187 const struct attribute_group *i2o_device_groups[] = {
188 	&i2o_device_group,
189 	NULL,
190 };
191 
192 /**
193  *	i2o_device_alloc - Allocate a I2O device and initialize it
194  *
195  *	Allocate the memory for a I2O device and initialize locks and lists
196  *
197  *	Returns the allocated I2O device or a negative error code if the device
198  *	could not be allocated.
199  */
i2o_device_alloc(void)200 static struct i2o_device *i2o_device_alloc(void)
201 {
202 	struct i2o_device *dev;
203 
204 	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
205 	if (!dev)
206 		return ERR_PTR(-ENOMEM);
207 
208 	INIT_LIST_HEAD(&dev->list);
209 	mutex_init(&dev->lock);
210 
211 	dev->device.bus = &i2o_bus_type;
212 	dev->device.release = &i2o_device_release;
213 
214 	return dev;
215 }
216 
217 /**
218  *	i2o_device_add - allocate a new I2O device and add it to the IOP
219  *	@c: I2O controller that the device is on
220  *	@entry: LCT entry of the I2O device
221  *
222  *	Allocate a new I2O device and initialize it with the LCT entry. The
223  *	device is appended to the device list of the controller.
224  *
225  *	Returns zero on success, or a -ve errno.
226  */
i2o_device_add(struct i2o_controller * c,i2o_lct_entry * entry)227 static int i2o_device_add(struct i2o_controller *c, i2o_lct_entry *entry)
228 {
229 	struct i2o_device *i2o_dev, *tmp;
230 	int rc;
231 
232 	i2o_dev = i2o_device_alloc();
233 	if (IS_ERR(i2o_dev)) {
234 		printk(KERN_ERR "i2o: unable to allocate i2o device\n");
235 		return PTR_ERR(i2o_dev);
236 	}
237 
238 	i2o_dev->lct_data = *entry;
239 
240 	dev_set_name(&i2o_dev->device, "%d:%03x", c->unit,
241 		     i2o_dev->lct_data.tid);
242 
243 	i2o_dev->iop = c;
244 	i2o_dev->device.parent = &c->device;
245 
246 	rc = device_register(&i2o_dev->device);
247 	if (rc)
248 		goto err;
249 
250 	list_add_tail(&i2o_dev->list, &c->devices);
251 
252 	/* create user entries for this device */
253 	tmp = i2o_iop_find_device(i2o_dev->iop, i2o_dev->lct_data.user_tid);
254 	if (tmp && (tmp != i2o_dev)) {
255 		rc = sysfs_create_link(&i2o_dev->device.kobj,
256 				       &tmp->device.kobj, "user");
257 		if (rc)
258 			goto unreg_dev;
259 	}
260 
261 	/* create user entries referring to this device */
262 	list_for_each_entry(tmp, &c->devices, list)
263 	    if ((tmp->lct_data.user_tid == i2o_dev->lct_data.tid)
264 		&& (tmp != i2o_dev)) {
265 		rc = sysfs_create_link(&tmp->device.kobj,
266 				       &i2o_dev->device.kobj, "user");
267 		if (rc)
268 			goto rmlink1;
269 	}
270 
271 	/* create parent entries for this device */
272 	tmp = i2o_iop_find_device(i2o_dev->iop, i2o_dev->lct_data.parent_tid);
273 	if (tmp && (tmp != i2o_dev)) {
274 		rc = sysfs_create_link(&i2o_dev->device.kobj,
275 				       &tmp->device.kobj, "parent");
276 		if (rc)
277 			goto rmlink1;
278 	}
279 
280 	/* create parent entries referring to this device */
281 	list_for_each_entry(tmp, &c->devices, list)
282 	    if ((tmp->lct_data.parent_tid == i2o_dev->lct_data.tid)
283 		&& (tmp != i2o_dev)) {
284 		rc = sysfs_create_link(&tmp->device.kobj,
285 				       &i2o_dev->device.kobj, "parent");
286 		if (rc)
287 			goto rmlink2;
288 	}
289 
290 	i2o_driver_notify_device_add_all(i2o_dev);
291 
292 	pr_debug("i2o: device %s added\n", dev_name(&i2o_dev->device));
293 
294 	return 0;
295 
296 rmlink2:
297 	/* If link creating failed halfway, we loop whole list to cleanup.
298 	 * And we don't care wrong removing of link, because sysfs_remove_link
299 	 * will take care of it.
300 	 */
301 	list_for_each_entry(tmp, &c->devices, list) {
302 		if (tmp->lct_data.parent_tid == i2o_dev->lct_data.tid)
303 			sysfs_remove_link(&tmp->device.kobj, "parent");
304 	}
305 	sysfs_remove_link(&i2o_dev->device.kobj, "parent");
306 rmlink1:
307 	list_for_each_entry(tmp, &c->devices, list)
308 		if (tmp->lct_data.user_tid == i2o_dev->lct_data.tid)
309 			sysfs_remove_link(&tmp->device.kobj, "user");
310 	sysfs_remove_link(&i2o_dev->device.kobj, "user");
311 unreg_dev:
312 	list_del(&i2o_dev->list);
313 	device_unregister(&i2o_dev->device);
314 err:
315 	kfree(i2o_dev);
316 	return rc;
317 }
318 
319 /**
320  *	i2o_device_remove - remove an I2O device from the I2O core
321  *	@i2o_dev: I2O device which should be released
322  *
323  *	Is used on I2O controller removal or LCT modification, when the device
324  *	is removed from the system. Note that the device could still hang
325  *	around until the refcount reaches 0.
326  */
i2o_device_remove(struct i2o_device * i2o_dev)327 void i2o_device_remove(struct i2o_device *i2o_dev)
328 {
329 	struct i2o_device *tmp;
330 	struct i2o_controller *c = i2o_dev->iop;
331 
332 	i2o_driver_notify_device_remove_all(i2o_dev);
333 
334 	sysfs_remove_link(&i2o_dev->device.kobj, "parent");
335 	sysfs_remove_link(&i2o_dev->device.kobj, "user");
336 
337 	list_for_each_entry(tmp, &c->devices, list) {
338 		if (tmp->lct_data.parent_tid == i2o_dev->lct_data.tid)
339 			sysfs_remove_link(&tmp->device.kobj, "parent");
340 		if (tmp->lct_data.user_tid == i2o_dev->lct_data.tid)
341 			sysfs_remove_link(&tmp->device.kobj, "user");
342 	}
343 	list_del(&i2o_dev->list);
344 
345 	device_unregister(&i2o_dev->device);
346 }
347 
348 /**
349  *	i2o_device_parse_lct - Parse a previously fetched LCT and create devices
350  *	@c: I2O controller from which the LCT should be parsed.
351  *
352  *	The Logical Configuration Table tells us what we can talk to on the
353  *	board. For every entry we create an I2O device, which is registered in
354  *	the I2O core.
355  *
356  *	Returns 0 on success or negative error code on failure.
357  */
i2o_device_parse_lct(struct i2o_controller * c)358 int i2o_device_parse_lct(struct i2o_controller *c)
359 {
360 	struct i2o_device *dev, *tmp;
361 	i2o_lct *lct;
362 	u32 *dlct = c->dlct.virt;
363 	int max = 0, i = 0;
364 	u16 table_size;
365 	u32 buf;
366 
367 	mutex_lock(&c->lct_lock);
368 
369 	kfree(c->lct);
370 
371 	buf = le32_to_cpu(*dlct++);
372 	table_size = buf & 0xffff;
373 
374 	lct = c->lct = kmalloc(table_size * 4, GFP_KERNEL);
375 	if (!lct) {
376 		mutex_unlock(&c->lct_lock);
377 		return -ENOMEM;
378 	}
379 
380 	lct->lct_ver = buf >> 28;
381 	lct->boot_tid = buf >> 16 & 0xfff;
382 	lct->table_size = table_size;
383 	lct->change_ind = le32_to_cpu(*dlct++);
384 	lct->iop_flags = le32_to_cpu(*dlct++);
385 
386 	table_size -= 3;
387 
388 	pr_debug("%s: LCT has %d entries (LCT size: %d)\n", c->name, max,
389 		 lct->table_size);
390 
391 	while (table_size > 0) {
392 		i2o_lct_entry *entry = &lct->lct_entry[max];
393 		int found = 0;
394 
395 		buf = le32_to_cpu(*dlct++);
396 		entry->entry_size = buf & 0xffff;
397 		entry->tid = buf >> 16 & 0xfff;
398 
399 		entry->change_ind = le32_to_cpu(*dlct++);
400 		entry->device_flags = le32_to_cpu(*dlct++);
401 
402 		buf = le32_to_cpu(*dlct++);
403 		entry->class_id = buf & 0xfff;
404 		entry->version = buf >> 12 & 0xf;
405 		entry->vendor_id = buf >> 16;
406 
407 		entry->sub_class = le32_to_cpu(*dlct++);
408 
409 		buf = le32_to_cpu(*dlct++);
410 		entry->user_tid = buf & 0xfff;
411 		entry->parent_tid = buf >> 12 & 0xfff;
412 		entry->bios_info = buf >> 24;
413 
414 		memcpy(&entry->identity_tag, dlct, 8);
415 		dlct += 2;
416 
417 		entry->event_capabilities = le32_to_cpu(*dlct++);
418 
419 		/* add new devices, which are new in the LCT */
420 		list_for_each_entry_safe(dev, tmp, &c->devices, list) {
421 			if (entry->tid == dev->lct_data.tid) {
422 				found = 1;
423 				break;
424 			}
425 		}
426 
427 		if (!found)
428 			i2o_device_add(c, entry);
429 
430 		table_size -= 9;
431 		max++;
432 	}
433 
434 	/* remove devices, which are not in the LCT anymore */
435 	list_for_each_entry_safe(dev, tmp, &c->devices, list) {
436 		int found = 0;
437 
438 		for (i = 0; i < max; i++) {
439 			if (lct->lct_entry[i].tid == dev->lct_data.tid) {
440 				found = 1;
441 				break;
442 			}
443 		}
444 
445 		if (!found)
446 			i2o_device_remove(dev);
447 	}
448 
449 	mutex_unlock(&c->lct_lock);
450 
451 	return 0;
452 }
453 
454 /*
455  *	Run time support routines
456  */
457 
458 /*	Issue UTIL_PARAMS_GET or UTIL_PARAMS_SET
459  *
460  *	This function can be used for all UtilParamsGet/Set operations.
461  *	The OperationList is given in oplist-buffer,
462  *	and results are returned in reslist-buffer.
463  *	Note that the minimum sized reslist is 8 bytes and contains
464  *	ResultCount, ErrorInfoSize, BlockStatus and BlockSize.
465  */
i2o_parm_issue(struct i2o_device * i2o_dev,int cmd,void * oplist,int oplen,void * reslist,int reslen)466 int i2o_parm_issue(struct i2o_device *i2o_dev, int cmd, void *oplist,
467 		   int oplen, void *reslist, int reslen)
468 {
469 	struct i2o_message *msg;
470 	int i = 0;
471 	int rc;
472 	struct i2o_dma res;
473 	struct i2o_controller *c = i2o_dev->iop;
474 	struct device *dev = &c->pdev->dev;
475 
476 	res.virt = NULL;
477 
478 	if (i2o_dma_alloc(dev, &res, reslen))
479 		return -ENOMEM;
480 
481 	msg = i2o_msg_get_wait(c, I2O_TIMEOUT_MESSAGE_GET);
482 	if (IS_ERR(msg)) {
483 		i2o_dma_free(dev, &res);
484 		return PTR_ERR(msg);
485 	}
486 
487 	i = 0;
488 	msg->u.head[1] =
489 	    cpu_to_le32(cmd << 24 | HOST_TID << 12 | i2o_dev->lct_data.tid);
490 	msg->body[i++] = cpu_to_le32(0x00000000);
491 	msg->body[i++] = cpu_to_le32(0x4C000000 | oplen);	/* OperationList */
492 	memcpy(&msg->body[i], oplist, oplen);
493 	i += (oplen / 4 + (oplen % 4 ? 1 : 0));
494 	msg->body[i++] = cpu_to_le32(0xD0000000 | res.len);	/* ResultList */
495 	msg->body[i++] = cpu_to_le32(res.phys);
496 
497 	msg->u.head[0] =
498 	    cpu_to_le32(I2O_MESSAGE_SIZE(i + sizeof(struct i2o_message) / 4) |
499 			SGL_OFFSET_5);
500 
501 	rc = i2o_msg_post_wait_mem(c, msg, 10, &res);
502 
503 	/* This only looks like a memory leak - don't "fix" it. */
504 	if (rc == -ETIMEDOUT)
505 		return rc;
506 
507 	memcpy(reslist, res.virt, res.len);
508 	i2o_dma_free(dev, &res);
509 
510 	return rc;
511 }
512 
513 /*
514  *	 Query one field group value or a whole scalar group.
515  */
i2o_parm_field_get(struct i2o_device * i2o_dev,int group,int field,void * buf,int buflen)516 int i2o_parm_field_get(struct i2o_device *i2o_dev, int group, int field,
517 		       void *buf, int buflen)
518 {
519 	u32 opblk[] = { cpu_to_le32(0x00000001),
520 		cpu_to_le32((u16) group << 16 | I2O_PARAMS_FIELD_GET),
521 		cpu_to_le32((s16) field << 16 | 0x00000001)
522 	};
523 	u8 *resblk;		/* 8 bytes for header */
524 	int rc;
525 
526 	resblk = kmalloc(buflen + 8, GFP_KERNEL);
527 	if (!resblk)
528 		return -ENOMEM;
529 
530 	rc = i2o_parm_issue(i2o_dev, I2O_CMD_UTIL_PARAMS_GET, opblk,
531 			    sizeof(opblk), resblk, buflen + 8);
532 
533 	memcpy(buf, resblk + 8, buflen);	/* cut off header */
534 
535 	kfree(resblk);
536 
537 	return rc;
538 }
539 
540 /*
541  *	if oper == I2O_PARAMS_TABLE_GET, get from all rows
542  *		if fieldcount == -1 return all fields
543  *			ibuf and ibuflen are unused (use NULL, 0)
544  *		else return specific fields
545  *			ibuf contains fieldindexes
546  *
547  *	if oper == I2O_PARAMS_LIST_GET, get from specific rows
548  *		if fieldcount == -1 return all fields
549  *			ibuf contains rowcount, keyvalues
550  *		else return specific fields
551  *			fieldcount is # of fieldindexes
552  *			ibuf contains fieldindexes, rowcount, keyvalues
553  *
554  *	You could also use directly function i2o_issue_params().
555  */
i2o_parm_table_get(struct i2o_device * dev,int oper,int group,int fieldcount,void * ibuf,int ibuflen,void * resblk,int reslen)556 int i2o_parm_table_get(struct i2o_device *dev, int oper, int group,
557 		       int fieldcount, void *ibuf, int ibuflen, void *resblk,
558 		       int reslen)
559 {
560 	u16 *opblk;
561 	int size;
562 
563 	size = 10 + ibuflen;
564 	if (size % 4)
565 		size += 4 - size % 4;
566 
567 	opblk = kmalloc(size, GFP_KERNEL);
568 	if (opblk == NULL) {
569 		printk(KERN_ERR "i2o: no memory for query buffer.\n");
570 		return -ENOMEM;
571 	}
572 
573 	opblk[0] = 1;		/* operation count */
574 	opblk[1] = 0;		/* pad */
575 	opblk[2] = oper;
576 	opblk[3] = group;
577 	opblk[4] = fieldcount;
578 	memcpy(opblk + 5, ibuf, ibuflen);	/* other params */
579 
580 	size = i2o_parm_issue(dev, I2O_CMD_UTIL_PARAMS_GET, opblk,
581 			      size, resblk, reslen);
582 
583 	kfree(opblk);
584 	if (size > reslen)
585 		return reslen;
586 
587 	return size;
588 }
589 
590 EXPORT_SYMBOL(i2o_device_claim);
591 EXPORT_SYMBOL(i2o_device_claim_release);
592 EXPORT_SYMBOL(i2o_parm_field_get);
593 EXPORT_SYMBOL(i2o_parm_table_get);
594 EXPORT_SYMBOL(i2o_parm_issue);
595