1 /*
2  * ACPI PCI HotPlug glue functions to ACPI CA subsystem
3  *
4  * Copyright (C) 2002,2003 Takayoshi Kochi (t-kochi@bq.jp.nec.com)
5  * Copyright (C) 2002 Hiroshi Aono (h-aono@ap.jp.nec.com)
6  * Copyright (C) 2002,2003 NEC Corporation
7  * Copyright (C) 2003-2005 Matthew Wilcox (matthew.wilcox@hp.com)
8  * Copyright (C) 2003-2005 Hewlett Packard
9  * Copyright (C) 2005 Rajesh Shah (rajesh.shah@intel.com)
10  * Copyright (C) 2005 Intel Corporation
11  *
12  * All rights reserved.
13  *
14  * This program is free software; you can redistribute it and/or modify
15  * it under the terms of the GNU General Public License as published by
16  * the Free Software Foundation; either version 2 of the License, or (at
17  * your option) any later version.
18  *
19  * This program is distributed in the hope that it will be useful, but
20  * WITHOUT ANY WARRANTY; without even the implied warranty of
21  * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
22  * NON INFRINGEMENT.  See the GNU General Public License for more
23  * details.
24  *
25  * You should have received a copy of the GNU General Public License
26  * along with this program; if not, write to the Free Software
27  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
28  *
29  * Send feedback to <kristen.c.accardi@intel.com>
30  *
31  */
32 
33 /*
34  * Lifetime rules for pci_dev:
35  *  - The one in acpiphp_func has its refcount elevated by pci_get_slot()
36  *    when the driver is loaded or when an insertion event occurs.  It loses
37  *    a refcount when its ejected or the driver unloads.
38  *  - The one in acpiphp_bridge has its refcount elevated by pci_get_slot()
39  *    when the bridge is scanned and it loses a refcount when the bridge
40  *    is removed.
41  */
42 
43 #include <linux/init.h>
44 #include <linux/module.h>
45 
46 #include <linux/kernel.h>
47 #include <linux/pci.h>
48 #include <linux/pci_hotplug.h>
49 #include <linux/mutex.h>
50 
51 #include "../pci.h"
52 #include "acpiphp.h"
53 
54 static LIST_HEAD(bridge_list);
55 static LIST_HEAD(ioapic_list);
56 static DEFINE_SPINLOCK(ioapic_list_lock);
57 
58 #define MY_NAME "acpiphp_glue"
59 
60 static void handle_hotplug_event_bridge (acpi_handle, u32, void *);
61 static void acpiphp_sanitize_bus(struct pci_bus *bus);
62 static void acpiphp_set_hpp_values(acpi_handle handle, struct pci_bus *bus);
63 static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context);
64 
65 
66 /*
67  * initialization & terminatation routines
68  */
69 
70 /**
71  * is_ejectable - determine if a slot is ejectable
72  * @handle: handle to acpi namespace
73  *
74  * Ejectable slot should satisfy at least these conditions:
75  *
76  *  1. has _ADR method
77  *  2. has _EJ0 method
78  *
79  * optionally
80  *
81  *  1. has _STA method
82  *  2. has _PS0 method
83  *  3. has _PS3 method
84  *  4. ..
85  */
86 static int is_ejectable(acpi_handle handle)
87 {
88 	acpi_status status;
89 	acpi_handle tmp;
90 
91 	status = acpi_get_handle(handle, "_ADR", &tmp);
92 	if (ACPI_FAILURE(status)) {
93 		return 0;
94 	}
95 
96 	status = acpi_get_handle(handle, "_EJ0", &tmp);
97 	if (ACPI_FAILURE(status)) {
98 		return 0;
99 	}
100 
101 	return 1;
102 }
103 
104 
105 /* callback routine to check for the existence of ejectable slots */
106 static acpi_status
107 is_ejectable_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
108 {
109 	int *count = (int *)context;
110 
111 	if (is_ejectable(handle)) {
112 		(*count)++;
113 		/* only one ejectable slot is enough */
114 		return AE_CTRL_TERMINATE;
115 	} else {
116 		return AE_OK;
117 	}
118 }
119 
120 /* callback routine to check for the existence of a pci dock device */
121 static acpi_status
122 is_pci_dock_device(acpi_handle handle, u32 lvl, void *context, void **rv)
123 {
124 	int *count = (int *)context;
125 
126 	if (is_dock_device(handle)) {
127 		(*count)++;
128 		return AE_CTRL_TERMINATE;
129 	} else {
130 		return AE_OK;
131 	}
132 }
133 
134 
135 
136 
137 /*
138  * the _DCK method can do funny things... and sometimes not
139  * hah-hah funny.
140  *
141  * TBD - figure out a way to only call fixups for
142  * systems that require them.
143  */
144 static int post_dock_fixups(struct notifier_block *nb, unsigned long val,
145 	void *v)
146 {
147 	struct acpiphp_func *func = container_of(nb, struct acpiphp_func, nb);
148 	struct pci_bus *bus = func->slot->bridge->pci_bus;
149 	u32 buses;
150 
151 	if (!bus->self)
152 		return  NOTIFY_OK;
153 
154 	/* fixup bad _DCK function that rewrites
155 	 * secondary bridge on slot
156 	 */
157 	pci_read_config_dword(bus->self,
158 			PCI_PRIMARY_BUS,
159 			&buses);
160 
161 	if (((buses >> 8) & 0xff) != bus->secondary) {
162 		buses = (buses & 0xff000000)
163 	     		| ((unsigned int)(bus->primary)     <<  0)
164 	     		| ((unsigned int)(bus->secondary)   <<  8)
165 	     		| ((unsigned int)(bus->subordinate) << 16);
166 		pci_write_config_dword(bus->self, PCI_PRIMARY_BUS, buses);
167 	}
168 	return NOTIFY_OK;
169 }
170 
171 
172 
173 
174 /* callback routine to register each ACPI PCI slot object */
175 static acpi_status
176 register_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
177 {
178 	struct acpiphp_bridge *bridge = (struct acpiphp_bridge *)context;
179 	struct acpiphp_slot *slot;
180 	struct acpiphp_func *newfunc;
181 	acpi_handle tmp;
182 	acpi_status status = AE_OK;
183 	unsigned long adr, sun;
184 	int device, function, retval;
185 
186 	status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr);
187 
188 	if (ACPI_FAILURE(status))
189 		return AE_OK;
190 
191 	status = acpi_get_handle(handle, "_EJ0", &tmp);
192 
193 	if (ACPI_FAILURE(status) && !(is_dock_device(handle)))
194 		return AE_OK;
195 
196 	device = (adr >> 16) & 0xffff;
197 	function = adr & 0xffff;
198 
199 	newfunc = kzalloc(sizeof(struct acpiphp_func), GFP_KERNEL);
200 	if (!newfunc)
201 		return AE_NO_MEMORY;
202 
203 	INIT_LIST_HEAD(&newfunc->sibling);
204 	newfunc->handle = handle;
205 	newfunc->function = function;
206 	if (ACPI_SUCCESS(status))
207 		newfunc->flags = FUNC_HAS_EJ0;
208 
209 	if (ACPI_SUCCESS(acpi_get_handle(handle, "_STA", &tmp)))
210 		newfunc->flags |= FUNC_HAS_STA;
211 
212 	if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS0", &tmp)))
213 		newfunc->flags |= FUNC_HAS_PS0;
214 
215 	if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS3", &tmp)))
216 		newfunc->flags |= FUNC_HAS_PS3;
217 
218 	if (ACPI_SUCCESS(acpi_get_handle(handle, "_DCK", &tmp)))
219 		newfunc->flags |= FUNC_HAS_DCK;
220 
221 	status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun);
222 	if (ACPI_FAILURE(status)) {
223 		/*
224 		 * use the count of the number of slots we've found
225 		 * for the number of the slot
226 		 */
227 		sun = bridge->nr_slots+1;
228 	}
229 
230 	/* search for objects that share the same slot */
231 	for (slot = bridge->slots; slot; slot = slot->next)
232 		if (slot->device == device) {
233 			if (slot->sun != sun)
234 				warn("sibling found, but _SUN doesn't match!\n");
235 			break;
236 		}
237 
238 	if (!slot) {
239 		slot = kzalloc(sizeof(struct acpiphp_slot), GFP_KERNEL);
240 		if (!slot) {
241 			kfree(newfunc);
242 			return AE_NO_MEMORY;
243 		}
244 
245 		slot->bridge = bridge;
246 		slot->device = device;
247 		slot->sun = sun;
248 		INIT_LIST_HEAD(&slot->funcs);
249 		mutex_init(&slot->crit_sect);
250 
251 		slot->next = bridge->slots;
252 		bridge->slots = slot;
253 
254 		bridge->nr_slots++;
255 
256 		dbg("found ACPI PCI Hotplug slot %d at PCI %04x:%02x:%02x\n",
257 				slot->sun, pci_domain_nr(bridge->pci_bus),
258 				bridge->pci_bus->number, slot->device);
259 		retval = acpiphp_register_hotplug_slot(slot);
260 		if (retval) {
261 			warn("acpiphp_register_hotplug_slot failed(err code = 0x%x)\n", retval);
262 			goto err_exit;
263 		}
264 	}
265 
266 	newfunc->slot = slot;
267 	list_add_tail(&newfunc->sibling, &slot->funcs);
268 
269 	/* associate corresponding pci_dev */
270 	newfunc->pci_dev = pci_get_slot(bridge->pci_bus,
271 					 PCI_DEVFN(device, function));
272 	if (newfunc->pci_dev) {
273 		slot->flags |= (SLOT_ENABLED | SLOT_POWEREDON);
274 	}
275 
276 	if (is_dock_device(handle)) {
277 		/* we don't want to call this device's _EJ0
278 		 * because we want the dock notify handler
279 		 * to call it after it calls _DCK
280 		 */
281 		newfunc->flags &= ~FUNC_HAS_EJ0;
282 		if (register_hotplug_dock_device(handle,
283 			handle_hotplug_event_func, newfunc))
284 			dbg("failed to register dock device\n");
285 
286 		/* we need to be notified when dock events happen
287 		 * outside of the hotplug operation, since we may
288 		 * need to do fixups before we can hotplug.
289 		 */
290 		newfunc->nb.notifier_call = post_dock_fixups;
291 		if (register_dock_notifier(&newfunc->nb))
292 			dbg("failed to register a dock notifier");
293 	}
294 
295 	/* install notify handler */
296 	if (!(newfunc->flags & FUNC_HAS_DCK)) {
297 		status = acpi_install_notify_handler(handle,
298 					     ACPI_SYSTEM_NOTIFY,
299 					     handle_hotplug_event_func,
300 					     newfunc);
301 
302 		if (ACPI_FAILURE(status))
303 			err("failed to register interrupt notify handler\n");
304 	} else
305 		status = AE_OK;
306 
307 	return status;
308 
309  err_exit:
310 	bridge->nr_slots--;
311 	bridge->slots = slot->next;
312 	kfree(slot);
313 	kfree(newfunc);
314 
315 	return AE_OK;
316 }
317 
318 
319 /* see if it's worth looking at this bridge */
320 static int detect_ejectable_slots(acpi_handle *bridge_handle)
321 {
322 	acpi_status status;
323 	int count;
324 
325 	count = 0;
326 
327 	/* only check slots defined directly below bridge object */
328 	status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge_handle, (u32)1,
329 				     is_ejectable_slot, (void *)&count, NULL);
330 
331 	/*
332 	 * we also need to add this bridge if there is a dock bridge or
333 	 * other pci device on a dock station (removable)
334 	 */
335 	if (!count)
336 		status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge_handle,
337 				(u32)1, is_pci_dock_device, (void *)&count,
338 				NULL);
339 
340 	return count;
341 }
342 
343 
344 /* decode ACPI 2.0 _HPP hot plug parameters */
345 static void decode_hpp(struct acpiphp_bridge *bridge)
346 {
347 	acpi_status status;
348 
349 	status = acpi_get_hp_params_from_firmware(bridge->pci_bus, &bridge->hpp);
350 	if (ACPI_FAILURE(status) ||
351 	    !bridge->hpp.t0 || (bridge->hpp.t0->revision > 1)) {
352 		/* use default numbers */
353 		printk(KERN_WARNING
354 		       "%s: Could not get hotplug parameters. Use defaults\n",
355 		       __func__);
356 		bridge->hpp.t0 = &bridge->hpp.type0_data;
357 		bridge->hpp.t0->revision = 0;
358 		bridge->hpp.t0->cache_line_size = 0x10;
359 		bridge->hpp.t0->latency_timer = 0x40;
360 		bridge->hpp.t0->enable_serr = 0;
361 		bridge->hpp.t0->enable_perr = 0;
362 	}
363 }
364 
365 
366 
367 /* initialize miscellaneous stuff for both root and PCI-to-PCI bridge */
368 static void init_bridge_misc(struct acpiphp_bridge *bridge)
369 {
370 	acpi_status status;
371 
372 	/* decode ACPI 2.0 _HPP (hot plug parameters) */
373 	decode_hpp(bridge);
374 
375 	/* must be added to the list prior to calling register_slot */
376 	list_add(&bridge->list, &bridge_list);
377 
378 	/* register all slot objects under this bridge */
379 	status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge->handle, (u32)1,
380 				     register_slot, bridge, NULL);
381 	if (ACPI_FAILURE(status)) {
382 		list_del(&bridge->list);
383 		return;
384 	}
385 
386 	/* install notify handler */
387 	if (bridge->type != BRIDGE_TYPE_HOST) {
388 		if ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func) {
389 			status = acpi_remove_notify_handler(bridge->func->handle,
390 						ACPI_SYSTEM_NOTIFY,
391 						handle_hotplug_event_func);
392 			if (ACPI_FAILURE(status))
393 				err("failed to remove notify handler\n");
394 		}
395 		status = acpi_install_notify_handler(bridge->handle,
396 					     ACPI_SYSTEM_NOTIFY,
397 					     handle_hotplug_event_bridge,
398 					     bridge);
399 
400 		if (ACPI_FAILURE(status)) {
401 			err("failed to register interrupt notify handler\n");
402 		}
403 	}
404 }
405 
406 
407 /* find acpiphp_func from acpiphp_bridge */
408 static struct acpiphp_func *acpiphp_bridge_handle_to_function(acpi_handle handle)
409 {
410 	struct list_head *node, *l;
411 	struct acpiphp_bridge *bridge;
412 	struct acpiphp_slot *slot;
413 	struct acpiphp_func *func;
414 
415 	list_for_each(node, &bridge_list) {
416 		bridge = list_entry(node, struct acpiphp_bridge, list);
417 		for (slot = bridge->slots; slot; slot = slot->next) {
418 			list_for_each(l, &slot->funcs) {
419 				func = list_entry(l, struct acpiphp_func,
420 							sibling);
421 				if (func->handle == handle)
422 					return func;
423 			}
424 		}
425 	}
426 
427 	return NULL;
428 }
429 
430 
431 static inline void config_p2p_bridge_flags(struct acpiphp_bridge *bridge)
432 {
433 	acpi_handle dummy_handle;
434 
435 	if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
436 					"_STA", &dummy_handle)))
437 		bridge->flags |= BRIDGE_HAS_STA;
438 
439 	if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
440 					"_EJ0", &dummy_handle)))
441 		bridge->flags |= BRIDGE_HAS_EJ0;
442 
443 	if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
444 					"_PS0", &dummy_handle)))
445 		bridge->flags |= BRIDGE_HAS_PS0;
446 
447 	if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
448 					"_PS3", &dummy_handle)))
449 		bridge->flags |= BRIDGE_HAS_PS3;
450 
451 	/* is this ejectable p2p bridge? */
452 	if (bridge->flags & BRIDGE_HAS_EJ0) {
453 		struct acpiphp_func *func;
454 
455 		dbg("found ejectable p2p bridge\n");
456 
457 		/* make link between PCI bridge and PCI function */
458 		func = acpiphp_bridge_handle_to_function(bridge->handle);
459 		if (!func)
460 			return;
461 		bridge->func = func;
462 		func->bridge = bridge;
463 	}
464 }
465 
466 
467 /* allocate and initialize host bridge data structure */
468 static void add_host_bridge(acpi_handle *handle, struct pci_bus *pci_bus)
469 {
470 	struct acpiphp_bridge *bridge;
471 
472 	bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
473 	if (bridge == NULL)
474 		return;
475 
476 	bridge->type = BRIDGE_TYPE_HOST;
477 	bridge->handle = handle;
478 
479 	bridge->pci_bus = pci_bus;
480 
481 	spin_lock_init(&bridge->res_lock);
482 
483 	init_bridge_misc(bridge);
484 }
485 
486 
487 /* allocate and initialize PCI-to-PCI bridge data structure */
488 static void add_p2p_bridge(acpi_handle *handle, struct pci_dev *pci_dev)
489 {
490 	struct acpiphp_bridge *bridge;
491 
492 	bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
493 	if (bridge == NULL) {
494 		err("out of memory\n");
495 		return;
496 	}
497 
498 	bridge->type = BRIDGE_TYPE_P2P;
499 	bridge->handle = handle;
500 	config_p2p_bridge_flags(bridge);
501 
502 	bridge->pci_dev = pci_dev_get(pci_dev);
503 	bridge->pci_bus = pci_dev->subordinate;
504 	if (!bridge->pci_bus) {
505 		err("This is not a PCI-to-PCI bridge!\n");
506 		goto err;
507 	}
508 
509 	spin_lock_init(&bridge->res_lock);
510 
511 	init_bridge_misc(bridge);
512 	return;
513  err:
514 	pci_dev_put(pci_dev);
515 	kfree(bridge);
516 	return;
517 }
518 
519 
520 /* callback routine to find P2P bridges */
521 static acpi_status
522 find_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
523 {
524 	acpi_status status;
525 	acpi_handle dummy_handle;
526 	unsigned long tmp;
527 	int device, function;
528 	struct pci_dev *dev;
529 	struct pci_bus *pci_bus = context;
530 
531 	status = acpi_get_handle(handle, "_ADR", &dummy_handle);
532 	if (ACPI_FAILURE(status))
533 		return AE_OK;		/* continue */
534 
535 	status = acpi_evaluate_integer(handle, "_ADR", NULL, &tmp);
536 	if (ACPI_FAILURE(status)) {
537 		dbg("%s: _ADR evaluation failure\n", __func__);
538 		return AE_OK;
539 	}
540 
541 	device = (tmp >> 16) & 0xffff;
542 	function = tmp & 0xffff;
543 
544 	dev = pci_get_slot(pci_bus, PCI_DEVFN(device, function));
545 
546 	if (!dev || !dev->subordinate)
547 		goto out;
548 
549 	/* check if this bridge has ejectable slots */
550 	if ((detect_ejectable_slots(handle) > 0)) {
551 		dbg("found PCI-to-PCI bridge at PCI %s\n", pci_name(dev));
552 		add_p2p_bridge(handle, dev);
553 	}
554 
555 	/* search P2P bridges under this p2p bridge */
556 	status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
557 				     find_p2p_bridge, dev->subordinate, NULL);
558 	if (ACPI_FAILURE(status))
559 		warn("find_p2p_bridge failed (error code = 0x%x)\n", status);
560 
561  out:
562 	pci_dev_put(dev);
563 	return AE_OK;
564 }
565 
566 
567 /* find hot-pluggable slots, and then find P2P bridge */
568 static int add_bridge(acpi_handle handle)
569 {
570 	acpi_status status;
571 	unsigned long tmp;
572 	int seg, bus;
573 	acpi_handle dummy_handle;
574 	struct pci_bus *pci_bus;
575 
576 	/* if the bridge doesn't have _STA, we assume it is always there */
577 	status = acpi_get_handle(handle, "_STA", &dummy_handle);
578 	if (ACPI_SUCCESS(status)) {
579 		status = acpi_evaluate_integer(handle, "_STA", NULL, &tmp);
580 		if (ACPI_FAILURE(status)) {
581 			dbg("%s: _STA evaluation failure\n", __func__);
582 			return 0;
583 		}
584 		if ((tmp & ACPI_STA_FUNCTIONING) == 0)
585 			/* don't register this object */
586 			return 0;
587 	}
588 
589 	/* get PCI segment number */
590 	status = acpi_evaluate_integer(handle, "_SEG", NULL, &tmp);
591 
592 	seg = ACPI_SUCCESS(status) ? tmp : 0;
593 
594 	/* get PCI bus number */
595 	status = acpi_evaluate_integer(handle, "_BBN", NULL, &tmp);
596 
597 	if (ACPI_SUCCESS(status)) {
598 		bus = tmp;
599 	} else {
600 		warn("can't get bus number, assuming 0\n");
601 		bus = 0;
602 	}
603 
604 	pci_bus = pci_find_bus(seg, bus);
605 	if (!pci_bus) {
606 		err("Can't find bus %04x:%02x\n", seg, bus);
607 		return 0;
608 	}
609 
610 	/* check if this bridge has ejectable slots */
611 	if (detect_ejectable_slots(handle) > 0) {
612 		dbg("found PCI host-bus bridge with hot-pluggable slots\n");
613 		add_host_bridge(handle, pci_bus);
614 	}
615 
616 	/* search P2P bridges under this host bridge */
617 	status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
618 				     find_p2p_bridge, pci_bus, NULL);
619 
620 	if (ACPI_FAILURE(status))
621 		warn("find_p2p_bridge failed (error code = 0x%x)\n", status);
622 
623 	return 0;
624 }
625 
626 static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle)
627 {
628 	struct list_head *head;
629 	list_for_each(head, &bridge_list) {
630 		struct acpiphp_bridge *bridge = list_entry(head,
631 						struct acpiphp_bridge, list);
632 		if (bridge->handle == handle)
633 			return bridge;
634 	}
635 
636 	return NULL;
637 }
638 
639 static void cleanup_bridge(struct acpiphp_bridge *bridge)
640 {
641 	struct list_head *list, *tmp;
642 	struct acpiphp_slot *slot;
643 	acpi_status status;
644 	acpi_handle handle = bridge->handle;
645 
646 	status = acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
647 					    handle_hotplug_event_bridge);
648 	if (ACPI_FAILURE(status))
649 		err("failed to remove notify handler\n");
650 
651 	if ((bridge->type != BRIDGE_TYPE_HOST) &&
652 	    ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func)) {
653 		status = acpi_install_notify_handler(bridge->func->handle,
654 						ACPI_SYSTEM_NOTIFY,
655 						handle_hotplug_event_func,
656 						bridge->func);
657 		if (ACPI_FAILURE(status))
658 			err("failed to install interrupt notify handler\n");
659 	}
660 
661 	slot = bridge->slots;
662 	while (slot) {
663 		struct acpiphp_slot *next = slot->next;
664 		list_for_each_safe (list, tmp, &slot->funcs) {
665 			struct acpiphp_func *func;
666 			func = list_entry(list, struct acpiphp_func, sibling);
667 			if (is_dock_device(func->handle)) {
668 				unregister_hotplug_dock_device(func->handle);
669 				unregister_dock_notifier(&func->nb);
670 			}
671 			if (!(func->flags & FUNC_HAS_DCK)) {
672 				status = acpi_remove_notify_handler(func->handle,
673 						ACPI_SYSTEM_NOTIFY,
674 						handle_hotplug_event_func);
675 				if (ACPI_FAILURE(status))
676 					err("failed to remove notify handler\n");
677 			}
678 			pci_dev_put(func->pci_dev);
679 			list_del(list);
680 			kfree(func);
681 		}
682 		acpiphp_unregister_hotplug_slot(slot);
683 		list_del(&slot->funcs);
684 		kfree(slot);
685 		slot = next;
686 	}
687 
688 	pci_dev_put(bridge->pci_dev);
689 	list_del(&bridge->list);
690 	kfree(bridge);
691 }
692 
693 static acpi_status
694 cleanup_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
695 {
696 	struct acpiphp_bridge *bridge;
697 
698 	/* cleanup p2p bridges under this P2P bridge
699 	   in a depth-first manner */
700 	acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
701 				cleanup_p2p_bridge, NULL, NULL);
702 
703 	if (!(bridge = acpiphp_handle_to_bridge(handle)))
704 		return AE_OK;
705 	cleanup_bridge(bridge);
706 	return AE_OK;
707 }
708 
709 static void remove_bridge(acpi_handle handle)
710 {
711 	struct acpiphp_bridge *bridge;
712 
713 	/* cleanup p2p bridges under this host bridge
714 	   in a depth-first manner */
715 	acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
716 				(u32)1, cleanup_p2p_bridge, NULL, NULL);
717 
718 	bridge = acpiphp_handle_to_bridge(handle);
719 	if (bridge)
720 		cleanup_bridge(bridge);
721 }
722 
723 static struct pci_dev * get_apic_pci_info(acpi_handle handle)
724 {
725 	struct acpi_pci_id id;
726 	struct pci_bus *bus;
727 	struct pci_dev *dev;
728 
729 	if (ACPI_FAILURE(acpi_get_pci_id(handle, &id)))
730 		return NULL;
731 
732 	bus = pci_find_bus(id.segment, id.bus);
733 	if (!bus)
734 		return NULL;
735 
736 	dev = pci_get_slot(bus, PCI_DEVFN(id.device, id.function));
737 	if (!dev)
738 		return NULL;
739 
740 	if ((dev->class != PCI_CLASS_SYSTEM_PIC_IOAPIC) &&
741 	    (dev->class != PCI_CLASS_SYSTEM_PIC_IOXAPIC))
742 	{
743 		pci_dev_put(dev);
744 		return NULL;
745 	}
746 
747 	return dev;
748 }
749 
750 static int get_gsi_base(acpi_handle handle, u32 *gsi_base)
751 {
752 	acpi_status status;
753 	int result = -1;
754 	unsigned long gsb;
755 	struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
756 	union acpi_object *obj;
757 	void *table;
758 
759 	status = acpi_evaluate_integer(handle, "_GSB", NULL, &gsb);
760 	if (ACPI_SUCCESS(status)) {
761 		*gsi_base = (u32)gsb;
762 		return 0;
763 	}
764 
765 	status = acpi_evaluate_object(handle, "_MAT", NULL, &buffer);
766 	if (ACPI_FAILURE(status) || !buffer.length || !buffer.pointer)
767 		return -1;
768 
769 	obj = buffer.pointer;
770 	if (obj->type != ACPI_TYPE_BUFFER)
771 		goto out;
772 
773 	table = obj->buffer.pointer;
774 	switch (((struct acpi_subtable_header *)table)->type) {
775 	case ACPI_MADT_TYPE_IO_SAPIC:
776 		*gsi_base = ((struct acpi_madt_io_sapic *)table)->global_irq_base;
777 		result = 0;
778 		break;
779 	case ACPI_MADT_TYPE_IO_APIC:
780 		*gsi_base = ((struct acpi_madt_io_apic *)table)->global_irq_base;
781 		result = 0;
782 		break;
783 	default:
784 		break;
785 	}
786  out:
787 	kfree(buffer.pointer);
788 	return result;
789 }
790 
791 static acpi_status
792 ioapic_add(acpi_handle handle, u32 lvl, void *context, void **rv)
793 {
794 	acpi_status status;
795 	unsigned long sta;
796 	acpi_handle tmp;
797 	struct pci_dev *pdev;
798 	u32 gsi_base;
799 	u64 phys_addr;
800 	struct acpiphp_ioapic *ioapic;
801 
802 	/* Evaluate _STA if present */
803 	status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
804 	if (ACPI_SUCCESS(status) && sta != ACPI_STA_ALL)
805 		return AE_CTRL_DEPTH;
806 
807 	/* Scan only PCI bus scope */
808 	status = acpi_get_handle(handle, "_HID", &tmp);
809 	if (ACPI_SUCCESS(status))
810 		return AE_CTRL_DEPTH;
811 
812 	if (get_gsi_base(handle, &gsi_base))
813 		return AE_OK;
814 
815 	ioapic = kmalloc(sizeof(*ioapic), GFP_KERNEL);
816 	if (!ioapic)
817 		return AE_NO_MEMORY;
818 
819 	pdev = get_apic_pci_info(handle);
820 	if (!pdev)
821 		goto exit_kfree;
822 
823 	if (pci_enable_device(pdev))
824 		goto exit_pci_dev_put;
825 
826 	pci_set_master(pdev);
827 
828 	if (pci_request_region(pdev, 0, "I/O APIC(acpiphp)"))
829 		goto exit_pci_disable_device;
830 
831 	phys_addr = pci_resource_start(pdev, 0);
832 	if (acpi_register_ioapic(handle, phys_addr, gsi_base))
833 		goto exit_pci_release_region;
834 
835 	ioapic->gsi_base = gsi_base;
836 	ioapic->dev = pdev;
837 	spin_lock(&ioapic_list_lock);
838 	list_add_tail(&ioapic->list, &ioapic_list);
839 	spin_unlock(&ioapic_list_lock);
840 
841 	return AE_OK;
842 
843  exit_pci_release_region:
844 	pci_release_region(pdev, 0);
845  exit_pci_disable_device:
846 	pci_disable_device(pdev);
847  exit_pci_dev_put:
848 	pci_dev_put(pdev);
849  exit_kfree:
850 	kfree(ioapic);
851 
852 	return AE_OK;
853 }
854 
855 static acpi_status
856 ioapic_remove(acpi_handle handle, u32 lvl, void *context, void **rv)
857 {
858 	acpi_status status;
859 	unsigned long sta;
860 	acpi_handle tmp;
861 	u32 gsi_base;
862 	struct acpiphp_ioapic *pos, *n, *ioapic = NULL;
863 
864 	/* Evaluate _STA if present */
865 	status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
866 	if (ACPI_SUCCESS(status) && sta != ACPI_STA_ALL)
867 		return AE_CTRL_DEPTH;
868 
869 	/* Scan only PCI bus scope */
870 	status = acpi_get_handle(handle, "_HID", &tmp);
871 	if (ACPI_SUCCESS(status))
872 		return AE_CTRL_DEPTH;
873 
874 	if (get_gsi_base(handle, &gsi_base))
875 		return AE_OK;
876 
877 	acpi_unregister_ioapic(handle, gsi_base);
878 
879 	spin_lock(&ioapic_list_lock);
880 	list_for_each_entry_safe(pos, n, &ioapic_list, list) {
881 		if (pos->gsi_base != gsi_base)
882 			continue;
883 		ioapic = pos;
884 		list_del(&ioapic->list);
885 		break;
886 	}
887 	spin_unlock(&ioapic_list_lock);
888 
889 	if (!ioapic)
890 		return AE_OK;
891 
892 	pci_release_region(ioapic->dev, 0);
893 	pci_disable_device(ioapic->dev);
894 	pci_dev_put(ioapic->dev);
895 	kfree(ioapic);
896 
897 	return AE_OK;
898 }
899 
900 static int acpiphp_configure_ioapics(acpi_handle handle)
901 {
902 	ioapic_add(handle, 0, NULL, NULL);
903 	acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
904 			    ACPI_UINT32_MAX, ioapic_add, NULL, NULL);
905 	return 0;
906 }
907 
908 static int acpiphp_unconfigure_ioapics(acpi_handle handle)
909 {
910 	ioapic_remove(handle, 0, NULL, NULL);
911 	acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
912 			    ACPI_UINT32_MAX, ioapic_remove, NULL, NULL);
913 	return 0;
914 }
915 
916 static int power_on_slot(struct acpiphp_slot *slot)
917 {
918 	acpi_status status;
919 	struct acpiphp_func *func;
920 	struct list_head *l;
921 	int retval = 0;
922 
923 	/* if already enabled, just skip */
924 	if (slot->flags & SLOT_POWEREDON)
925 		goto err_exit;
926 
927 	list_for_each (l, &slot->funcs) {
928 		func = list_entry(l, struct acpiphp_func, sibling);
929 
930 		if (func->flags & FUNC_HAS_PS0) {
931 			dbg("%s: executing _PS0\n", __func__);
932 			status = acpi_evaluate_object(func->handle, "_PS0", NULL, NULL);
933 			if (ACPI_FAILURE(status)) {
934 				warn("%s: _PS0 failed\n", __func__);
935 				retval = -1;
936 				goto err_exit;
937 			} else
938 				break;
939 		}
940 	}
941 
942 	/* TBD: evaluate _STA to check if the slot is enabled */
943 
944 	slot->flags |= SLOT_POWEREDON;
945 
946  err_exit:
947 	return retval;
948 }
949 
950 
951 static int power_off_slot(struct acpiphp_slot *slot)
952 {
953 	acpi_status status;
954 	struct acpiphp_func *func;
955 	struct list_head *l;
956 
957 	int retval = 0;
958 
959 	/* if already disabled, just skip */
960 	if ((slot->flags & SLOT_POWEREDON) == 0)
961 		goto err_exit;
962 
963 	list_for_each (l, &slot->funcs) {
964 		func = list_entry(l, struct acpiphp_func, sibling);
965 
966 		if (func->flags & FUNC_HAS_PS3) {
967 			status = acpi_evaluate_object(func->handle, "_PS3", NULL, NULL);
968 			if (ACPI_FAILURE(status)) {
969 				warn("%s: _PS3 failed\n", __func__);
970 				retval = -1;
971 				goto err_exit;
972 			} else
973 				break;
974 		}
975 	}
976 
977 	/* TBD: evaluate _STA to check if the slot is disabled */
978 
979 	slot->flags &= (~SLOT_POWEREDON);
980 
981  err_exit:
982 	return retval;
983 }
984 
985 
986 
987 /**
988  * acpiphp_max_busnr - return the highest reserved bus number under the given bus.
989  * @bus: bus to start search with
990  */
991 static unsigned char acpiphp_max_busnr(struct pci_bus *bus)
992 {
993 	struct list_head *tmp;
994 	unsigned char max, n;
995 
996 	/*
997 	 * pci_bus_max_busnr will return the highest
998 	 * reserved busnr for all these children.
999 	 * that is equivalent to the bus->subordinate
1000 	 * value.  We don't want to use the parent's
1001 	 * bus->subordinate value because it could have
1002 	 * padding in it.
1003 	 */
1004 	max = bus->secondary;
1005 
1006 	list_for_each(tmp, &bus->children) {
1007 		n = pci_bus_max_busnr(pci_bus_b(tmp));
1008 		if (n > max)
1009 			max = n;
1010 	}
1011 	return max;
1012 }
1013 
1014 
1015 /**
1016  * acpiphp_bus_add - add a new bus to acpi subsystem
1017  * @func: acpiphp_func of the bridge
1018  */
1019 static int acpiphp_bus_add(struct acpiphp_func *func)
1020 {
1021 	acpi_handle phandle;
1022 	struct acpi_device *device, *pdevice;
1023 	int ret_val;
1024 
1025 	acpi_get_parent(func->handle, &phandle);
1026 	if (acpi_bus_get_device(phandle, &pdevice)) {
1027 		dbg("no parent device, assuming NULL\n");
1028 		pdevice = NULL;
1029 	}
1030 	if (!acpi_bus_get_device(func->handle, &device)) {
1031 		dbg("bus exists... trim\n");
1032 		/* this shouldn't be in here, so remove
1033 		 * the bus then re-add it...
1034 		 */
1035 		ret_val = acpi_bus_trim(device, 1);
1036 		dbg("acpi_bus_trim return %x\n", ret_val);
1037 	}
1038 
1039 	ret_val = acpi_bus_add(&device, pdevice, func->handle,
1040 		ACPI_BUS_TYPE_DEVICE);
1041 	if (ret_val) {
1042 		dbg("error adding bus, %x\n",
1043 			-ret_val);
1044 		goto acpiphp_bus_add_out;
1045 	}
1046 	/*
1047 	 * try to start anyway.  We could have failed to add
1048 	 * simply because this bus had previously been added
1049 	 * on another add.  Don't bother with the return value
1050 	 * we just keep going.
1051 	 */
1052 	ret_val = acpi_bus_start(device);
1053 
1054 acpiphp_bus_add_out:
1055 	return ret_val;
1056 }
1057 
1058 
1059 /**
1060  * acpiphp_bus_trim - trim a bus from acpi subsystem
1061  * @handle: handle to acpi namespace
1062  */
1063 static int acpiphp_bus_trim(acpi_handle handle)
1064 {
1065 	struct acpi_device *device;
1066 	int retval;
1067 
1068 	retval = acpi_bus_get_device(handle, &device);
1069 	if (retval) {
1070 		dbg("acpi_device not found\n");
1071 		return retval;
1072 	}
1073 
1074 	retval = acpi_bus_trim(device, 1);
1075 	if (retval)
1076 		err("cannot remove from acpi list\n");
1077 
1078 	return retval;
1079 }
1080 
1081 /**
1082  * enable_device - enable, configure a slot
1083  * @slot: slot to be enabled
1084  *
1085  * This function should be called per *physical slot*,
1086  * not per each slot object in ACPI namespace.
1087  */
1088 static int __ref enable_device(struct acpiphp_slot *slot)
1089 {
1090 	struct pci_dev *dev;
1091 	struct pci_bus *bus = slot->bridge->pci_bus;
1092 	struct list_head *l;
1093 	struct acpiphp_func *func;
1094 	int retval = 0;
1095 	int num, max, pass;
1096 	acpi_status status;
1097 
1098 	if (slot->flags & SLOT_ENABLED)
1099 		goto err_exit;
1100 
1101 	/* sanity check: dev should be NULL when hot-plugged in */
1102 	dev = pci_get_slot(bus, PCI_DEVFN(slot->device, 0));
1103 	if (dev) {
1104 		/* This case shouldn't happen */
1105 		err("pci_dev structure already exists.\n");
1106 		pci_dev_put(dev);
1107 		retval = -1;
1108 		goto err_exit;
1109 	}
1110 
1111 	num = pci_scan_slot(bus, PCI_DEVFN(slot->device, 0));
1112 	if (num == 0) {
1113 		err("No new device found\n");
1114 		retval = -1;
1115 		goto err_exit;
1116 	}
1117 
1118 	max = acpiphp_max_busnr(bus);
1119 	for (pass = 0; pass < 2; pass++) {
1120 		list_for_each_entry(dev, &bus->devices, bus_list) {
1121 			if (PCI_SLOT(dev->devfn) != slot->device)
1122 				continue;
1123 			if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
1124 			    dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
1125 				max = pci_scan_bridge(bus, dev, max, pass);
1126 				if (pass && dev->subordinate)
1127 					pci_bus_size_bridges(dev->subordinate);
1128 			}
1129 		}
1130 	}
1131 
1132 	list_for_each (l, &slot->funcs) {
1133 		func = list_entry(l, struct acpiphp_func, sibling);
1134 		acpiphp_bus_add(func);
1135 	}
1136 
1137 	pci_bus_assign_resources(bus);
1138 	acpiphp_sanitize_bus(bus);
1139 	acpiphp_set_hpp_values(slot->bridge->handle, bus);
1140 	list_for_each_entry(func, &slot->funcs, sibling)
1141 		acpiphp_configure_ioapics(func->handle);
1142 	pci_enable_bridges(bus);
1143 	pci_bus_add_devices(bus);
1144 
1145 	/* associate pci_dev to our representation */
1146 	list_for_each (l, &slot->funcs) {
1147 		func = list_entry(l, struct acpiphp_func, sibling);
1148 		func->pci_dev = pci_get_slot(bus, PCI_DEVFN(slot->device,
1149 							func->function));
1150 		if (!func->pci_dev)
1151 			continue;
1152 
1153 		if (func->pci_dev->hdr_type != PCI_HEADER_TYPE_BRIDGE &&
1154 		    func->pci_dev->hdr_type != PCI_HEADER_TYPE_CARDBUS)
1155 			continue;
1156 
1157 		status = find_p2p_bridge(func->handle, (u32)1, bus, NULL);
1158 		if (ACPI_FAILURE(status))
1159 			warn("find_p2p_bridge failed (error code = 0x%x)\n",
1160 				status);
1161 	}
1162 
1163 	slot->flags |= SLOT_ENABLED;
1164 
1165  err_exit:
1166 	return retval;
1167 }
1168 
1169 static void disable_bridges(struct pci_bus *bus)
1170 {
1171 	struct pci_dev *dev;
1172 	list_for_each_entry(dev, &bus->devices, bus_list) {
1173 		if (dev->subordinate) {
1174 			disable_bridges(dev->subordinate);
1175 			pci_disable_device(dev);
1176 		}
1177 	}
1178 }
1179 
1180 /**
1181  * disable_device - disable a slot
1182  * @slot: ACPI PHP slot
1183  */
1184 static int disable_device(struct acpiphp_slot *slot)
1185 {
1186 	int retval = 0;
1187 	struct acpiphp_func *func;
1188 	struct list_head *l;
1189 
1190 	/* is this slot already disabled? */
1191 	if (!(slot->flags & SLOT_ENABLED))
1192 		goto err_exit;
1193 
1194 	list_for_each (l, &slot->funcs) {
1195 		func = list_entry(l, struct acpiphp_func, sibling);
1196 
1197 		if (func->bridge) {
1198 			/* cleanup p2p bridges under this P2P bridge */
1199 			cleanup_p2p_bridge(func->bridge->handle,
1200 						(u32)1, NULL, NULL);
1201 			func->bridge = NULL;
1202 		}
1203 
1204 		if (func->pci_dev) {
1205 			pci_stop_bus_device(func->pci_dev);
1206 			if (func->pci_dev->subordinate) {
1207 				disable_bridges(func->pci_dev->subordinate);
1208 				pci_disable_device(func->pci_dev);
1209 			}
1210 		}
1211 	}
1212 
1213 	list_for_each (l, &slot->funcs) {
1214 		func = list_entry(l, struct acpiphp_func, sibling);
1215 
1216 		acpiphp_unconfigure_ioapics(func->handle);
1217 		acpiphp_bus_trim(func->handle);
1218 		/* try to remove anyway.
1219 		 * acpiphp_bus_add might have been failed */
1220 
1221 		if (!func->pci_dev)
1222 			continue;
1223 
1224 		pci_remove_bus_device(func->pci_dev);
1225 		pci_dev_put(func->pci_dev);
1226 		func->pci_dev = NULL;
1227 	}
1228 
1229 	slot->flags &= (~SLOT_ENABLED);
1230 
1231  err_exit:
1232 	return retval;
1233 }
1234 
1235 
1236 /**
1237  * get_slot_status - get ACPI slot status
1238  * @slot: ACPI PHP slot
1239  *
1240  * If a slot has _STA for each function and if any one of them
1241  * returned non-zero status, return it.
1242  *
1243  * If a slot doesn't have _STA and if any one of its functions'
1244  * configuration space is configured, return 0x0f as a _STA.
1245  *
1246  * Otherwise return 0.
1247  */
1248 static unsigned int get_slot_status(struct acpiphp_slot *slot)
1249 {
1250 	acpi_status status;
1251 	unsigned long sta = 0;
1252 	u32 dvid;
1253 	struct list_head *l;
1254 	struct acpiphp_func *func;
1255 
1256 	list_for_each (l, &slot->funcs) {
1257 		func = list_entry(l, struct acpiphp_func, sibling);
1258 
1259 		if (func->flags & FUNC_HAS_STA) {
1260 			status = acpi_evaluate_integer(func->handle, "_STA", NULL, &sta);
1261 			if (ACPI_SUCCESS(status) && sta)
1262 				break;
1263 		} else {
1264 			pci_bus_read_config_dword(slot->bridge->pci_bus,
1265 						  PCI_DEVFN(slot->device,
1266 							    func->function),
1267 						  PCI_VENDOR_ID, &dvid);
1268 			if (dvid != 0xffffffff) {
1269 				sta = ACPI_STA_ALL;
1270 				break;
1271 			}
1272 		}
1273 	}
1274 
1275 	return (unsigned int)sta;
1276 }
1277 
1278 /**
1279  * acpiphp_eject_slot - physically eject the slot
1280  * @slot: ACPI PHP slot
1281  */
1282 int acpiphp_eject_slot(struct acpiphp_slot *slot)
1283 {
1284 	acpi_status status;
1285 	struct acpiphp_func *func;
1286 	struct list_head *l;
1287 	struct acpi_object_list arg_list;
1288 	union acpi_object arg;
1289 
1290 	list_for_each (l, &slot->funcs) {
1291 		func = list_entry(l, struct acpiphp_func, sibling);
1292 
1293 		/* We don't want to call _EJ0 on non-existing functions. */
1294 		if ((func->flags & FUNC_HAS_EJ0)) {
1295 			/* _EJ0 method take one argument */
1296 			arg_list.count = 1;
1297 			arg_list.pointer = &arg;
1298 			arg.type = ACPI_TYPE_INTEGER;
1299 			arg.integer.value = 1;
1300 
1301 			status = acpi_evaluate_object(func->handle, "_EJ0", &arg_list, NULL);
1302 			if (ACPI_FAILURE(status)) {
1303 				warn("%s: _EJ0 failed\n", __func__);
1304 				return -1;
1305 			} else
1306 				break;
1307 		}
1308 	}
1309 	return 0;
1310 }
1311 
1312 /**
1313  * acpiphp_check_bridge - re-enumerate devices
1314  * @bridge: where to begin re-enumeration
1315  *
1316  * Iterate over all slots under this bridge and make sure that if a
1317  * card is present they are enabled, and if not they are disabled.
1318  */
1319 static int acpiphp_check_bridge(struct acpiphp_bridge *bridge)
1320 {
1321 	struct acpiphp_slot *slot;
1322 	int retval = 0;
1323 	int enabled, disabled;
1324 
1325 	enabled = disabled = 0;
1326 
1327 	for (slot = bridge->slots; slot; slot = slot->next) {
1328 		unsigned int status = get_slot_status(slot);
1329 		if (slot->flags & SLOT_ENABLED) {
1330 			if (status == ACPI_STA_ALL)
1331 				continue;
1332 			retval = acpiphp_disable_slot(slot);
1333 			if (retval) {
1334 				err("Error occurred in disabling\n");
1335 				goto err_exit;
1336 			} else {
1337 				acpiphp_eject_slot(slot);
1338 			}
1339 			disabled++;
1340 		} else {
1341 			if (status != ACPI_STA_ALL)
1342 				continue;
1343 			retval = acpiphp_enable_slot(slot);
1344 			if (retval) {
1345 				err("Error occurred in enabling\n");
1346 				goto err_exit;
1347 			}
1348 			enabled++;
1349 		}
1350 	}
1351 
1352 	dbg("%s: %d enabled, %d disabled\n", __func__, enabled, disabled);
1353 
1354  err_exit:
1355 	return retval;
1356 }
1357 
1358 static void program_hpp(struct pci_dev *dev, struct acpiphp_bridge *bridge)
1359 {
1360 	u16 pci_cmd, pci_bctl;
1361 	struct pci_dev *cdev;
1362 
1363 	/* Program hpp values for this device */
1364 	if (!(dev->hdr_type == PCI_HEADER_TYPE_NORMAL ||
1365 			(dev->hdr_type == PCI_HEADER_TYPE_BRIDGE &&
1366 			(dev->class >> 8) == PCI_CLASS_BRIDGE_PCI)))
1367 		return;
1368 
1369 	if ((dev->class >> 8) == PCI_CLASS_BRIDGE_HOST)
1370 		return;
1371 
1372 	pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE,
1373 			bridge->hpp.t0->cache_line_size);
1374 	pci_write_config_byte(dev, PCI_LATENCY_TIMER,
1375 			bridge->hpp.t0->latency_timer);
1376 	pci_read_config_word(dev, PCI_COMMAND, &pci_cmd);
1377 	if (bridge->hpp.t0->enable_serr)
1378 		pci_cmd |= PCI_COMMAND_SERR;
1379 	else
1380 		pci_cmd &= ~PCI_COMMAND_SERR;
1381 	if (bridge->hpp.t0->enable_perr)
1382 		pci_cmd |= PCI_COMMAND_PARITY;
1383 	else
1384 		pci_cmd &= ~PCI_COMMAND_PARITY;
1385 	pci_write_config_word(dev, PCI_COMMAND, pci_cmd);
1386 
1387 	/* Program bridge control value and child devices */
1388 	if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
1389 		pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER,
1390 				bridge->hpp.t0->latency_timer);
1391 		pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &pci_bctl);
1392 		if (bridge->hpp.t0->enable_serr)
1393 			pci_bctl |= PCI_BRIDGE_CTL_SERR;
1394 		else
1395 			pci_bctl &= ~PCI_BRIDGE_CTL_SERR;
1396 		if (bridge->hpp.t0->enable_perr)
1397 			pci_bctl |= PCI_BRIDGE_CTL_PARITY;
1398 		else
1399 			pci_bctl &= ~PCI_BRIDGE_CTL_PARITY;
1400 		pci_write_config_word(dev, PCI_BRIDGE_CONTROL, pci_bctl);
1401 		if (dev->subordinate) {
1402 			list_for_each_entry(cdev, &dev->subordinate->devices,
1403 					bus_list)
1404 				program_hpp(cdev, bridge);
1405 		}
1406 	}
1407 }
1408 
1409 static void acpiphp_set_hpp_values(acpi_handle handle, struct pci_bus *bus)
1410 {
1411 	struct acpiphp_bridge bridge;
1412 	struct pci_dev *dev;
1413 
1414 	memset(&bridge, 0, sizeof(bridge));
1415 	bridge.handle = handle;
1416 	bridge.pci_bus = bus;
1417 	bridge.pci_dev = bus->self;
1418 	decode_hpp(&bridge);
1419 	list_for_each_entry(dev, &bus->devices, bus_list)
1420 		program_hpp(dev, &bridge);
1421 
1422 }
1423 
1424 /*
1425  * Remove devices for which we could not assign resources, call
1426  * arch specific code to fix-up the bus
1427  */
1428 static void acpiphp_sanitize_bus(struct pci_bus *bus)
1429 {
1430 	struct pci_dev *dev;
1431 	int i;
1432 	unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM;
1433 
1434 	list_for_each_entry(dev, &bus->devices, bus_list) {
1435 		for (i=0; i<PCI_BRIDGE_RESOURCES; i++) {
1436 			struct resource *res = &dev->resource[i];
1437 			if ((res->flags & type_mask) && !res->start &&
1438 					res->end) {
1439 				/* Could not assign a required resources
1440 				 * for this device, remove it */
1441 				pci_remove_bus_device(dev);
1442 				break;
1443 			}
1444 		}
1445 	}
1446 }
1447 
1448 /* Program resources in newly inserted bridge */
1449 static int acpiphp_configure_bridge (acpi_handle handle)
1450 {
1451 	struct acpi_pci_id pci_id;
1452 	struct pci_bus *bus;
1453 
1454 	if (ACPI_FAILURE(acpi_get_pci_id(handle, &pci_id))) {
1455 		err("cannot get PCI domain and bus number for bridge\n");
1456 		return -EINVAL;
1457 	}
1458 	bus = pci_find_bus(pci_id.segment, pci_id.bus);
1459 	if (!bus) {
1460 		err("cannot find bus %d:%d\n",
1461 				pci_id.segment, pci_id.bus);
1462 		return -EINVAL;
1463 	}
1464 
1465 	pci_bus_size_bridges(bus);
1466 	pci_bus_assign_resources(bus);
1467 	acpiphp_sanitize_bus(bus);
1468 	acpiphp_set_hpp_values(handle, bus);
1469 	pci_enable_bridges(bus);
1470 	acpiphp_configure_ioapics(handle);
1471 	return 0;
1472 }
1473 
1474 static void handle_bridge_insertion(acpi_handle handle, u32 type)
1475 {
1476 	struct acpi_device *device, *pdevice;
1477 	acpi_handle phandle;
1478 
1479 	if ((type != ACPI_NOTIFY_BUS_CHECK) &&
1480 			(type != ACPI_NOTIFY_DEVICE_CHECK)) {
1481 		err("unexpected notification type %d\n", type);
1482 		return;
1483 	}
1484 
1485 	acpi_get_parent(handle, &phandle);
1486 	if (acpi_bus_get_device(phandle, &pdevice)) {
1487 		dbg("no parent device, assuming NULL\n");
1488 		pdevice = NULL;
1489 	}
1490 	if (acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE)) {
1491 		err("cannot add bridge to acpi list\n");
1492 		return;
1493 	}
1494 	if (!acpiphp_configure_bridge(handle) &&
1495 		!acpi_bus_start(device))
1496 		add_bridge(handle);
1497 	else
1498 		err("cannot configure and start bridge\n");
1499 
1500 }
1501 
1502 /*
1503  * ACPI event handlers
1504  */
1505 
1506 static acpi_status
1507 count_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1508 {
1509 	int *count = (int *)context;
1510 	struct acpiphp_bridge *bridge;
1511 
1512 	bridge = acpiphp_handle_to_bridge(handle);
1513 	if (bridge)
1514 		(*count)++;
1515 	return AE_OK ;
1516 }
1517 
1518 static acpi_status
1519 check_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1520 {
1521 	struct acpiphp_bridge *bridge;
1522 	char objname[64];
1523 	struct acpi_buffer buffer = { .length = sizeof(objname),
1524 				      .pointer = objname };
1525 
1526 	bridge = acpiphp_handle_to_bridge(handle);
1527 	if (bridge) {
1528 		acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1529 		dbg("%s: re-enumerating slots under %s\n",
1530 			__func__, objname);
1531 		acpiphp_check_bridge(bridge);
1532 	}
1533 	return AE_OK ;
1534 }
1535 
1536 /**
1537  * handle_hotplug_event_bridge - handle ACPI event on bridges
1538  * @handle: Notify()'ed acpi_handle
1539  * @type: Notify code
1540  * @context: pointer to acpiphp_bridge structure
1541  *
1542  * Handles ACPI event notification on {host,p2p} bridges.
1543  */
1544 static void handle_hotplug_event_bridge(acpi_handle handle, u32 type, void *context)
1545 {
1546 	struct acpiphp_bridge *bridge;
1547 	char objname[64];
1548 	struct acpi_buffer buffer = { .length = sizeof(objname),
1549 				      .pointer = objname };
1550 	struct acpi_device *device;
1551 	int num_sub_bridges = 0;
1552 
1553 	if (acpi_bus_get_device(handle, &device)) {
1554 		/* This bridge must have just been physically inserted */
1555 		handle_bridge_insertion(handle, type);
1556 		return;
1557 	}
1558 
1559 	bridge = acpiphp_handle_to_bridge(handle);
1560 	if (type == ACPI_NOTIFY_BUS_CHECK) {
1561 		acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, ACPI_UINT32_MAX,
1562 			count_sub_bridges, &num_sub_bridges, NULL);
1563 	}
1564 
1565 	if (!bridge && !num_sub_bridges) {
1566 		err("cannot get bridge info\n");
1567 		return;
1568 	}
1569 
1570 	acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1571 
1572 	switch (type) {
1573 	case ACPI_NOTIFY_BUS_CHECK:
1574 		/* bus re-enumerate */
1575 		dbg("%s: Bus check notify on %s\n", __func__, objname);
1576 		if (bridge) {
1577 			dbg("%s: re-enumerating slots under %s\n",
1578 				__func__, objname);
1579 			acpiphp_check_bridge(bridge);
1580 		}
1581 		if (num_sub_bridges)
1582 			acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
1583 				ACPI_UINT32_MAX, check_sub_bridges, NULL, NULL);
1584 		break;
1585 
1586 	case ACPI_NOTIFY_DEVICE_CHECK:
1587 		/* device check */
1588 		dbg("%s: Device check notify on %s\n", __func__, objname);
1589 		acpiphp_check_bridge(bridge);
1590 		break;
1591 
1592 	case ACPI_NOTIFY_DEVICE_WAKE:
1593 		/* wake event */
1594 		dbg("%s: Device wake notify on %s\n", __func__, objname);
1595 		break;
1596 
1597 	case ACPI_NOTIFY_EJECT_REQUEST:
1598 		/* request device eject */
1599 		dbg("%s: Device eject notify on %s\n", __func__, objname);
1600 		if ((bridge->type != BRIDGE_TYPE_HOST) &&
1601 		    (bridge->flags & BRIDGE_HAS_EJ0)) {
1602 			struct acpiphp_slot *slot;
1603 			slot = bridge->func->slot;
1604 			if (!acpiphp_disable_slot(slot))
1605 				acpiphp_eject_slot(slot);
1606 		}
1607 		break;
1608 
1609 	case ACPI_NOTIFY_FREQUENCY_MISMATCH:
1610 		printk(KERN_ERR "Device %s cannot be configured due"
1611 				" to a frequency mismatch\n", objname);
1612 		break;
1613 
1614 	case ACPI_NOTIFY_BUS_MODE_MISMATCH:
1615 		printk(KERN_ERR "Device %s cannot be configured due"
1616 				" to a bus mode mismatch\n", objname);
1617 		break;
1618 
1619 	case ACPI_NOTIFY_POWER_FAULT:
1620 		printk(KERN_ERR "Device %s has suffered a power fault\n",
1621 				objname);
1622 		break;
1623 
1624 	default:
1625 		warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
1626 		break;
1627 	}
1628 }
1629 
1630 /**
1631  * handle_hotplug_event_func - handle ACPI event on functions (i.e. slots)
1632  * @handle: Notify()'ed acpi_handle
1633  * @type: Notify code
1634  * @context: pointer to acpiphp_func structure
1635  *
1636  * Handles ACPI event notification on slots.
1637  */
1638 static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context)
1639 {
1640 	struct acpiphp_func *func;
1641 	char objname[64];
1642 	struct acpi_buffer buffer = { .length = sizeof(objname),
1643 				      .pointer = objname };
1644 
1645 	acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1646 
1647 	func = (struct acpiphp_func *)context;
1648 
1649 	switch (type) {
1650 	case ACPI_NOTIFY_BUS_CHECK:
1651 		/* bus re-enumerate */
1652 		dbg("%s: Bus check notify on %s\n", __func__, objname);
1653 		acpiphp_enable_slot(func->slot);
1654 		break;
1655 
1656 	case ACPI_NOTIFY_DEVICE_CHECK:
1657 		/* device check : re-enumerate from parent bus */
1658 		dbg("%s: Device check notify on %s\n", __func__, objname);
1659 		acpiphp_check_bridge(func->slot->bridge);
1660 		break;
1661 
1662 	case ACPI_NOTIFY_DEVICE_WAKE:
1663 		/* wake event */
1664 		dbg("%s: Device wake notify on %s\n", __func__, objname);
1665 		break;
1666 
1667 	case ACPI_NOTIFY_EJECT_REQUEST:
1668 		/* request device eject */
1669 		dbg("%s: Device eject notify on %s\n", __func__, objname);
1670 		if (!(acpiphp_disable_slot(func->slot)))
1671 			acpiphp_eject_slot(func->slot);
1672 		break;
1673 
1674 	default:
1675 		warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
1676 		break;
1677 	}
1678 }
1679 
1680 
1681 static acpi_status
1682 find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1683 {
1684 	int *count = (int *)context;
1685 
1686 	if (acpi_root_bridge(handle)) {
1687 		acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
1688 				handle_hotplug_event_bridge, NULL);
1689 			(*count)++;
1690 	}
1691 	return AE_OK ;
1692 }
1693 
1694 static struct acpi_pci_driver acpi_pci_hp_driver = {
1695 	.add =		add_bridge,
1696 	.remove =	remove_bridge,
1697 };
1698 
1699 /**
1700  * acpiphp_glue_init - initializes all PCI hotplug - ACPI glue data structures
1701  */
1702 int __init acpiphp_glue_init(void)
1703 {
1704 	int num = 0;
1705 
1706 	acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
1707 			ACPI_UINT32_MAX, find_root_bridges, &num, NULL);
1708 
1709 	if (num <= 0)
1710 		return -1;
1711 	else
1712 		acpi_pci_register_driver(&acpi_pci_hp_driver);
1713 
1714 	return 0;
1715 }
1716 
1717 
1718 /**
1719  * acpiphp_glue_exit - terminates all PCI hotplug - ACPI glue data structures
1720  *
1721  * This function frees all data allocated in acpiphp_glue_init().
1722  */
1723 void  acpiphp_glue_exit(void)
1724 {
1725 	acpi_pci_unregister_driver(&acpi_pci_hp_driver);
1726 }
1727 
1728 
1729 /**
1730  * acpiphp_get_num_slots - count number of slots in a system
1731  */
1732 int __init acpiphp_get_num_slots(void)
1733 {
1734 	struct acpiphp_bridge *bridge;
1735 	int num_slots = 0;
1736 
1737 	list_for_each_entry (bridge, &bridge_list, list) {
1738 		dbg("Bus %04x:%02x has %d slot%s\n",
1739 				pci_domain_nr(bridge->pci_bus),
1740 				bridge->pci_bus->number, bridge->nr_slots,
1741 				bridge->nr_slots == 1 ? "" : "s");
1742 		num_slots += bridge->nr_slots;
1743 	}
1744 
1745 	dbg("Total %d slots\n", num_slots);
1746 	return num_slots;
1747 }
1748 
1749 
1750 #if 0
1751 /**
1752  * acpiphp_for_each_slot - call function for each slot
1753  * @fn: callback function
1754  * @data: context to be passed to callback function
1755  */
1756 static int acpiphp_for_each_slot(acpiphp_callback fn, void *data)
1757 {
1758 	struct list_head *node;
1759 	struct acpiphp_bridge *bridge;
1760 	struct acpiphp_slot *slot;
1761 	int retval = 0;
1762 
1763 	list_for_each (node, &bridge_list) {
1764 		bridge = (struct acpiphp_bridge *)node;
1765 		for (slot = bridge->slots; slot; slot = slot->next) {
1766 			retval = fn(slot, data);
1767 			if (!retval)
1768 				goto err_exit;
1769 		}
1770 	}
1771 
1772  err_exit:
1773 	return retval;
1774 }
1775 #endif
1776 
1777 
1778 /**
1779  * acpiphp_enable_slot - power on slot
1780  * @slot: ACPI PHP slot
1781  */
1782 int acpiphp_enable_slot(struct acpiphp_slot *slot)
1783 {
1784 	int retval;
1785 
1786 	mutex_lock(&slot->crit_sect);
1787 
1788 	/* wake up all functions */
1789 	retval = power_on_slot(slot);
1790 	if (retval)
1791 		goto err_exit;
1792 
1793 	if (get_slot_status(slot) == ACPI_STA_ALL) {
1794 		/* configure all functions */
1795 		retval = enable_device(slot);
1796 		if (retval)
1797 			power_off_slot(slot);
1798 	} else {
1799 		dbg("%s: Slot status is not ACPI_STA_ALL\n", __func__);
1800 		power_off_slot(slot);
1801 	}
1802 
1803  err_exit:
1804 	mutex_unlock(&slot->crit_sect);
1805 	return retval;
1806 }
1807 
1808 /**
1809  * acpiphp_disable_slot - power off slot
1810  * @slot: ACPI PHP slot
1811  */
1812 int acpiphp_disable_slot(struct acpiphp_slot *slot)
1813 {
1814 	int retval = 0;
1815 
1816 	mutex_lock(&slot->crit_sect);
1817 
1818 	/* unconfigure all functions */
1819 	retval = disable_device(slot);
1820 	if (retval)
1821 		goto err_exit;
1822 
1823 	/* power off all functions */
1824 	retval = power_off_slot(slot);
1825 	if (retval)
1826 		goto err_exit;
1827 
1828  err_exit:
1829 	mutex_unlock(&slot->crit_sect);
1830 	return retval;
1831 }
1832 
1833 
1834 /*
1835  * slot enabled:  1
1836  * slot disabled: 0
1837  */
1838 u8 acpiphp_get_power_status(struct acpiphp_slot *slot)
1839 {
1840 	return (slot->flags & SLOT_POWEREDON);
1841 }
1842 
1843 
1844 /*
1845  * latch   open:  1
1846  * latch closed:  0
1847  */
1848 u8 acpiphp_get_latch_status(struct acpiphp_slot *slot)
1849 {
1850 	unsigned int sta;
1851 
1852 	sta = get_slot_status(slot);
1853 
1854 	return (sta & ACPI_STA_SHOW_IN_UI) ? 0 : 1;
1855 }
1856 
1857 
1858 /*
1859  * adapter presence : 1
1860  *          absence : 0
1861  */
1862 u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot)
1863 {
1864 	unsigned int sta;
1865 
1866 	sta = get_slot_status(slot);
1867 
1868 	return (sta == 0) ? 0 : 1;
1869 }
1870 
1871 
1872 /*
1873  * pci address (seg/bus/dev)
1874  */
1875 u32 acpiphp_get_address(struct acpiphp_slot *slot)
1876 {
1877 	u32 address;
1878 	struct pci_bus *pci_bus = slot->bridge->pci_bus;
1879 
1880 	address = (pci_domain_nr(pci_bus) << 16) |
1881 		  (pci_bus->number << 8) |
1882 		  slot->device;
1883 
1884 	return address;
1885 }
1886