ACPI: Change acpi_evaluate_integer to support 64-bit on 32-bit kernels
[linux-2.6.git] / drivers / pci / hotplug / acpiphp_glue.c
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 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                         if (retval == -EBUSY)
262                                 warn("Slot %d already registered by another "
263                                         "hotplug driver\n", slot->sun);
264                         else
265                                 warn("acpiphp_register_hotplug_slot failed "
266                                         "(err code = 0x%x)\n", retval);
267                         goto err_exit;
268                 }
269         }
270
271         newfunc->slot = slot;
272         list_add_tail(&newfunc->sibling, &slot->funcs);
273
274         /* associate corresponding pci_dev */
275         newfunc->pci_dev = pci_get_slot(bridge->pci_bus,
276                                          PCI_DEVFN(device, function));
277         if (newfunc->pci_dev) {
278                 slot->flags |= (SLOT_ENABLED | SLOT_POWEREDON);
279         }
280
281         if (is_dock_device(handle)) {
282                 /* we don't want to call this device's _EJ0
283                  * because we want the dock notify handler
284                  * to call it after it calls _DCK
285                  */
286                 newfunc->flags &= ~FUNC_HAS_EJ0;
287                 if (register_hotplug_dock_device(handle,
288                         handle_hotplug_event_func, newfunc))
289                         dbg("failed to register dock device\n");
290
291                 /* we need to be notified when dock events happen
292                  * outside of the hotplug operation, since we may
293                  * need to do fixups before we can hotplug.
294                  */
295                 newfunc->nb.notifier_call = post_dock_fixups;
296                 if (register_dock_notifier(&newfunc->nb))
297                         dbg("failed to register a dock notifier");
298         }
299
300         /* install notify handler */
301         if (!(newfunc->flags & FUNC_HAS_DCK)) {
302                 status = acpi_install_notify_handler(handle,
303                                              ACPI_SYSTEM_NOTIFY,
304                                              handle_hotplug_event_func,
305                                              newfunc);
306
307                 if (ACPI_FAILURE(status))
308                         err("failed to register interrupt notify handler\n");
309         } else
310                 status = AE_OK;
311
312         return status;
313
314  err_exit:
315         bridge->nr_slots--;
316         bridge->slots = slot->next;
317         kfree(slot);
318         kfree(newfunc);
319
320         return AE_OK;
321 }
322
323
324 /* see if it's worth looking at this bridge */
325 static int detect_ejectable_slots(acpi_handle *bridge_handle)
326 {
327         acpi_status status;
328         int count;
329
330         count = 0;
331
332         /* only check slots defined directly below bridge object */
333         status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge_handle, (u32)1,
334                                      is_ejectable_slot, (void *)&count, NULL);
335
336         /*
337          * we also need to add this bridge if there is a dock bridge or
338          * other pci device on a dock station (removable)
339          */
340         if (!count)
341                 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge_handle,
342                                 (u32)1, is_pci_dock_device, (void *)&count,
343                                 NULL);
344
345         return count;
346 }
347
348
349 /* decode ACPI 2.0 _HPP hot plug parameters */
350 static void decode_hpp(struct acpiphp_bridge *bridge)
351 {
352         acpi_status status;
353
354         status = acpi_get_hp_params_from_firmware(bridge->pci_bus, &bridge->hpp);
355         if (ACPI_FAILURE(status) ||
356             !bridge->hpp.t0 || (bridge->hpp.t0->revision > 1)) {
357                 /* use default numbers */
358                 printk(KERN_WARNING
359                        "%s: Could not get hotplug parameters. Use defaults\n",
360                        __func__);
361                 bridge->hpp.t0 = &bridge->hpp.type0_data;
362                 bridge->hpp.t0->revision = 0;
363                 bridge->hpp.t0->cache_line_size = 0x10;
364                 bridge->hpp.t0->latency_timer = 0x40;
365                 bridge->hpp.t0->enable_serr = 0;
366                 bridge->hpp.t0->enable_perr = 0;
367         }
368 }
369
370
371
372 /* initialize miscellaneous stuff for both root and PCI-to-PCI bridge */
373 static void init_bridge_misc(struct acpiphp_bridge *bridge)
374 {
375         acpi_status status;
376
377         /* decode ACPI 2.0 _HPP (hot plug parameters) */
378         decode_hpp(bridge);
379
380         /* must be added to the list prior to calling register_slot */
381         list_add(&bridge->list, &bridge_list);
382
383         /* register all slot objects under this bridge */
384         status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge->handle, (u32)1,
385                                      register_slot, bridge, NULL);
386         if (ACPI_FAILURE(status)) {
387                 list_del(&bridge->list);
388                 return;
389         }
390
391         /* install notify handler */
392         if (bridge->type != BRIDGE_TYPE_HOST) {
393                 if ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func) {
394                         status = acpi_remove_notify_handler(bridge->func->handle,
395                                                 ACPI_SYSTEM_NOTIFY,
396                                                 handle_hotplug_event_func);
397                         if (ACPI_FAILURE(status))
398                                 err("failed to remove notify handler\n");
399                 }
400                 status = acpi_install_notify_handler(bridge->handle,
401                                              ACPI_SYSTEM_NOTIFY,
402                                              handle_hotplug_event_bridge,
403                                              bridge);
404
405                 if (ACPI_FAILURE(status)) {
406                         err("failed to register interrupt notify handler\n");
407                 }
408         }
409 }
410
411
412 /* find acpiphp_func from acpiphp_bridge */
413 static struct acpiphp_func *acpiphp_bridge_handle_to_function(acpi_handle handle)
414 {
415         struct list_head *node, *l;
416         struct acpiphp_bridge *bridge;
417         struct acpiphp_slot *slot;
418         struct acpiphp_func *func;
419
420         list_for_each(node, &bridge_list) {
421                 bridge = list_entry(node, struct acpiphp_bridge, list);
422                 for (slot = bridge->slots; slot; slot = slot->next) {
423                         list_for_each(l, &slot->funcs) {
424                                 func = list_entry(l, struct acpiphp_func,
425                                                         sibling);
426                                 if (func->handle == handle)
427                                         return func;
428                         }
429                 }
430         }
431
432         return NULL;
433 }
434
435
436 static inline void config_p2p_bridge_flags(struct acpiphp_bridge *bridge)
437 {
438         acpi_handle dummy_handle;
439
440         if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
441                                         "_STA", &dummy_handle)))
442                 bridge->flags |= BRIDGE_HAS_STA;
443
444         if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
445                                         "_EJ0", &dummy_handle)))
446                 bridge->flags |= BRIDGE_HAS_EJ0;
447
448         if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
449                                         "_PS0", &dummy_handle)))
450                 bridge->flags |= BRIDGE_HAS_PS0;
451
452         if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
453                                         "_PS3", &dummy_handle)))
454                 bridge->flags |= BRIDGE_HAS_PS3;
455
456         /* is this ejectable p2p bridge? */
457         if (bridge->flags & BRIDGE_HAS_EJ0) {
458                 struct acpiphp_func *func;
459
460                 dbg("found ejectable p2p bridge\n");
461
462                 /* make link between PCI bridge and PCI function */
463                 func = acpiphp_bridge_handle_to_function(bridge->handle);
464                 if (!func)
465                         return;
466                 bridge->func = func;
467                 func->bridge = bridge;
468         }
469 }
470
471
472 /* allocate and initialize host bridge data structure */
473 static void add_host_bridge(acpi_handle *handle, struct pci_bus *pci_bus)
474 {
475         struct acpiphp_bridge *bridge;
476
477         bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
478         if (bridge == NULL)
479                 return;
480
481         bridge->type = BRIDGE_TYPE_HOST;
482         bridge->handle = handle;
483
484         bridge->pci_bus = pci_bus;
485
486         spin_lock_init(&bridge->res_lock);
487
488         init_bridge_misc(bridge);
489 }
490
491
492 /* allocate and initialize PCI-to-PCI bridge data structure */
493 static void add_p2p_bridge(acpi_handle *handle, struct pci_dev *pci_dev)
494 {
495         struct acpiphp_bridge *bridge;
496
497         bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
498         if (bridge == NULL) {
499                 err("out of memory\n");
500                 return;
501         }
502
503         bridge->type = BRIDGE_TYPE_P2P;
504         bridge->handle = handle;
505         config_p2p_bridge_flags(bridge);
506
507         bridge->pci_dev = pci_dev_get(pci_dev);
508         bridge->pci_bus = pci_dev->subordinate;
509         if (!bridge->pci_bus) {
510                 err("This is not a PCI-to-PCI bridge!\n");
511                 goto err;
512         }
513
514         spin_lock_init(&bridge->res_lock);
515
516         init_bridge_misc(bridge);
517         return;
518  err:
519         pci_dev_put(pci_dev);
520         kfree(bridge);
521         return;
522 }
523
524
525 /* callback routine to find P2P bridges */
526 static acpi_status
527 find_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
528 {
529         acpi_status status;
530         acpi_handle dummy_handle;
531         unsigned long long tmp;
532         int device, function;
533         struct pci_dev *dev;
534         struct pci_bus *pci_bus = context;
535
536         status = acpi_get_handle(handle, "_ADR", &dummy_handle);
537         if (ACPI_FAILURE(status))
538                 return AE_OK;           /* continue */
539
540         status = acpi_evaluate_integer(handle, "_ADR", NULL, &tmp);
541         if (ACPI_FAILURE(status)) {
542                 dbg("%s: _ADR evaluation failure\n", __func__);
543                 return AE_OK;
544         }
545
546         device = (tmp >> 16) & 0xffff;
547         function = tmp & 0xffff;
548
549         dev = pci_get_slot(pci_bus, PCI_DEVFN(device, function));
550
551         if (!dev || !dev->subordinate)
552                 goto out;
553
554         /* check if this bridge has ejectable slots */
555         if ((detect_ejectable_slots(handle) > 0)) {
556                 dbg("found PCI-to-PCI bridge at PCI %s\n", pci_name(dev));
557                 add_p2p_bridge(handle, dev);
558         }
559
560         /* search P2P bridges under this p2p bridge */
561         status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
562                                      find_p2p_bridge, dev->subordinate, NULL);
563         if (ACPI_FAILURE(status))
564                 warn("find_p2p_bridge failed (error code = 0x%x)\n", status);
565
566  out:
567         pci_dev_put(dev);
568         return AE_OK;
569 }
570
571
572 /* find hot-pluggable slots, and then find P2P bridge */
573 static int add_bridge(acpi_handle handle)
574 {
575         acpi_status status;
576         unsigned long long tmp;
577         int seg, bus;
578         acpi_handle dummy_handle;
579         struct pci_bus *pci_bus;
580
581         /* if the bridge doesn't have _STA, we assume it is always there */
582         status = acpi_get_handle(handle, "_STA", &dummy_handle);
583         if (ACPI_SUCCESS(status)) {
584                 status = acpi_evaluate_integer(handle, "_STA", NULL, &tmp);
585                 if (ACPI_FAILURE(status)) {
586                         dbg("%s: _STA evaluation failure\n", __func__);
587                         return 0;
588                 }
589                 if ((tmp & ACPI_STA_FUNCTIONING) == 0)
590                         /* don't register this object */
591                         return 0;
592         }
593
594         /* get PCI segment number */
595         status = acpi_evaluate_integer(handle, "_SEG", NULL, &tmp);
596
597         seg = ACPI_SUCCESS(status) ? tmp : 0;
598
599         /* get PCI bus number */
600         status = acpi_evaluate_integer(handle, "_BBN", NULL, &tmp);
601
602         if (ACPI_SUCCESS(status)) {
603                 bus = tmp;
604         } else {
605                 warn("can't get bus number, assuming 0\n");
606                 bus = 0;
607         }
608
609         pci_bus = pci_find_bus(seg, bus);
610         if (!pci_bus) {
611                 err("Can't find bus %04x:%02x\n", seg, bus);
612                 return 0;
613         }
614
615         /* check if this bridge has ejectable slots */
616         if (detect_ejectable_slots(handle) > 0) {
617                 dbg("found PCI host-bus bridge with hot-pluggable slots\n");
618                 add_host_bridge(handle, pci_bus);
619         }
620
621         /* search P2P bridges under this host bridge */
622         status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
623                                      find_p2p_bridge, pci_bus, NULL);
624
625         if (ACPI_FAILURE(status))
626                 warn("find_p2p_bridge failed (error code = 0x%x)\n", status);
627
628         return 0;
629 }
630
631 static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle)
632 {
633         struct list_head *head;
634         list_for_each(head, &bridge_list) {
635                 struct acpiphp_bridge *bridge = list_entry(head,
636                                                 struct acpiphp_bridge, list);
637                 if (bridge->handle == handle)
638                         return bridge;
639         }
640
641         return NULL;
642 }
643
644 static void cleanup_bridge(struct acpiphp_bridge *bridge)
645 {
646         struct list_head *list, *tmp;
647         struct acpiphp_slot *slot;
648         acpi_status status;
649         acpi_handle handle = bridge->handle;
650
651         status = acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
652                                             handle_hotplug_event_bridge);
653         if (ACPI_FAILURE(status))
654                 err("failed to remove notify handler\n");
655
656         if ((bridge->type != BRIDGE_TYPE_HOST) &&
657             ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func)) {
658                 status = acpi_install_notify_handler(bridge->func->handle,
659                                                 ACPI_SYSTEM_NOTIFY,
660                                                 handle_hotplug_event_func,
661                                                 bridge->func);
662                 if (ACPI_FAILURE(status))
663                         err("failed to install interrupt notify handler\n");
664         }
665
666         slot = bridge->slots;
667         while (slot) {
668                 struct acpiphp_slot *next = slot->next;
669                 list_for_each_safe (list, tmp, &slot->funcs) {
670                         struct acpiphp_func *func;
671                         func = list_entry(list, struct acpiphp_func, sibling);
672                         if (is_dock_device(func->handle)) {
673                                 unregister_hotplug_dock_device(func->handle);
674                                 unregister_dock_notifier(&func->nb);
675                         }
676                         if (!(func->flags & FUNC_HAS_DCK)) {
677                                 status = acpi_remove_notify_handler(func->handle,
678                                                 ACPI_SYSTEM_NOTIFY,
679                                                 handle_hotplug_event_func);
680                                 if (ACPI_FAILURE(status))
681                                         err("failed to remove notify handler\n");
682                         }
683                         pci_dev_put(func->pci_dev);
684                         list_del(list);
685                         kfree(func);
686                 }
687                 acpiphp_unregister_hotplug_slot(slot);
688                 list_del(&slot->funcs);
689                 kfree(slot);
690                 slot = next;
691         }
692
693         pci_dev_put(bridge->pci_dev);
694         list_del(&bridge->list);
695         kfree(bridge);
696 }
697
698 static acpi_status
699 cleanup_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
700 {
701         struct acpiphp_bridge *bridge;
702
703         /* cleanup p2p bridges under this P2P bridge
704            in a depth-first manner */
705         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
706                                 cleanup_p2p_bridge, NULL, NULL);
707
708         bridge = acpiphp_handle_to_bridge(handle);
709         if (bridge)
710                 cleanup_bridge(bridge);
711
712         return AE_OK;
713 }
714
715 static void remove_bridge(acpi_handle handle)
716 {
717         struct acpiphp_bridge *bridge;
718
719         /* cleanup p2p bridges under this host bridge
720            in a depth-first manner */
721         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
722                                 (u32)1, cleanup_p2p_bridge, NULL, NULL);
723
724         /*
725          * On root bridges with hotplug slots directly underneath (ie,
726          * no p2p bridge inbetween), we call cleanup_bridge(). 
727          *
728          * The else clause cleans up root bridges that either had no
729          * hotplug slots at all, or had a p2p bridge underneath.
730          */
731         bridge = acpiphp_handle_to_bridge(handle);
732         if (bridge)
733                 cleanup_bridge(bridge);
734         else
735                 acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
736                                            handle_hotplug_event_bridge);
737 }
738
739 static struct pci_dev * get_apic_pci_info(acpi_handle handle)
740 {
741         struct acpi_pci_id id;
742         struct pci_bus *bus;
743         struct pci_dev *dev;
744
745         if (ACPI_FAILURE(acpi_get_pci_id(handle, &id)))
746                 return NULL;
747
748         bus = pci_find_bus(id.segment, id.bus);
749         if (!bus)
750                 return NULL;
751
752         dev = pci_get_slot(bus, PCI_DEVFN(id.device, id.function));
753         if (!dev)
754                 return NULL;
755
756         if ((dev->class != PCI_CLASS_SYSTEM_PIC_IOAPIC) &&
757             (dev->class != PCI_CLASS_SYSTEM_PIC_IOXAPIC))
758         {
759                 pci_dev_put(dev);
760                 return NULL;
761         }
762
763         return dev;
764 }
765
766 static int get_gsi_base(acpi_handle handle, u32 *gsi_base)
767 {
768         acpi_status status;
769         int result = -1;
770         unsigned long long gsb;
771         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
772         union acpi_object *obj;
773         void *table;
774
775         status = acpi_evaluate_integer(handle, "_GSB", NULL, &gsb);
776         if (ACPI_SUCCESS(status)) {
777                 *gsi_base = (u32)gsb;
778                 return 0;
779         }
780
781         status = acpi_evaluate_object(handle, "_MAT", NULL, &buffer);
782         if (ACPI_FAILURE(status) || !buffer.length || !buffer.pointer)
783                 return -1;
784
785         obj = buffer.pointer;
786         if (obj->type != ACPI_TYPE_BUFFER)
787                 goto out;
788
789         table = obj->buffer.pointer;
790         switch (((struct acpi_subtable_header *)table)->type) {
791         case ACPI_MADT_TYPE_IO_SAPIC:
792                 *gsi_base = ((struct acpi_madt_io_sapic *)table)->global_irq_base;
793                 result = 0;
794                 break;
795         case ACPI_MADT_TYPE_IO_APIC:
796                 *gsi_base = ((struct acpi_madt_io_apic *)table)->global_irq_base;
797                 result = 0;
798                 break;
799         default:
800                 break;
801         }
802  out:
803         kfree(buffer.pointer);
804         return result;
805 }
806
807 static acpi_status
808 ioapic_add(acpi_handle handle, u32 lvl, void *context, void **rv)
809 {
810         acpi_status status;
811         unsigned long long sta;
812         acpi_handle tmp;
813         struct pci_dev *pdev;
814         u32 gsi_base;
815         u64 phys_addr;
816         struct acpiphp_ioapic *ioapic;
817
818         /* Evaluate _STA if present */
819         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
820         if (ACPI_SUCCESS(status) && sta != ACPI_STA_ALL)
821                 return AE_CTRL_DEPTH;
822
823         /* Scan only PCI bus scope */
824         status = acpi_get_handle(handle, "_HID", &tmp);
825         if (ACPI_SUCCESS(status))
826                 return AE_CTRL_DEPTH;
827
828         if (get_gsi_base(handle, &gsi_base))
829                 return AE_OK;
830
831         ioapic = kmalloc(sizeof(*ioapic), GFP_KERNEL);
832         if (!ioapic)
833                 return AE_NO_MEMORY;
834
835         pdev = get_apic_pci_info(handle);
836         if (!pdev)
837                 goto exit_kfree;
838
839         if (pci_enable_device(pdev))
840                 goto exit_pci_dev_put;
841
842         pci_set_master(pdev);
843
844         if (pci_request_region(pdev, 0, "I/O APIC(acpiphp)"))
845                 goto exit_pci_disable_device;
846
847         phys_addr = pci_resource_start(pdev, 0);
848         if (acpi_register_ioapic(handle, phys_addr, gsi_base))
849                 goto exit_pci_release_region;
850
851         ioapic->gsi_base = gsi_base;
852         ioapic->dev = pdev;
853         spin_lock(&ioapic_list_lock);
854         list_add_tail(&ioapic->list, &ioapic_list);
855         spin_unlock(&ioapic_list_lock);
856
857         return AE_OK;
858
859  exit_pci_release_region:
860         pci_release_region(pdev, 0);
861  exit_pci_disable_device:
862         pci_disable_device(pdev);
863  exit_pci_dev_put:
864         pci_dev_put(pdev);
865  exit_kfree:
866         kfree(ioapic);
867
868         return AE_OK;
869 }
870
871 static acpi_status
872 ioapic_remove(acpi_handle handle, u32 lvl, void *context, void **rv)
873 {
874         acpi_status status;
875         unsigned long long sta;
876         acpi_handle tmp;
877         u32 gsi_base;
878         struct acpiphp_ioapic *pos, *n, *ioapic = NULL;
879
880         /* Evaluate _STA if present */
881         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
882         if (ACPI_SUCCESS(status) && sta != ACPI_STA_ALL)
883                 return AE_CTRL_DEPTH;
884
885         /* Scan only PCI bus scope */
886         status = acpi_get_handle(handle, "_HID", &tmp);
887         if (ACPI_SUCCESS(status))
888                 return AE_CTRL_DEPTH;
889
890         if (get_gsi_base(handle, &gsi_base))
891                 return AE_OK;
892
893         acpi_unregister_ioapic(handle, gsi_base);
894
895         spin_lock(&ioapic_list_lock);
896         list_for_each_entry_safe(pos, n, &ioapic_list, list) {
897                 if (pos->gsi_base != gsi_base)
898                         continue;
899                 ioapic = pos;
900                 list_del(&ioapic->list);
901                 break;
902         }
903         spin_unlock(&ioapic_list_lock);
904
905         if (!ioapic)
906                 return AE_OK;
907
908         pci_release_region(ioapic->dev, 0);
909         pci_disable_device(ioapic->dev);
910         pci_dev_put(ioapic->dev);
911         kfree(ioapic);
912
913         return AE_OK;
914 }
915
916 static int acpiphp_configure_ioapics(acpi_handle handle)
917 {
918         ioapic_add(handle, 0, NULL, NULL);
919         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
920                             ACPI_UINT32_MAX, ioapic_add, NULL, NULL);
921         return 0;
922 }
923
924 static int acpiphp_unconfigure_ioapics(acpi_handle handle)
925 {
926         ioapic_remove(handle, 0, NULL, NULL);
927         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
928                             ACPI_UINT32_MAX, ioapic_remove, NULL, NULL);
929         return 0;
930 }
931
932 static int power_on_slot(struct acpiphp_slot *slot)
933 {
934         acpi_status status;
935         struct acpiphp_func *func;
936         struct list_head *l;
937         int retval = 0;
938
939         /* if already enabled, just skip */
940         if (slot->flags & SLOT_POWEREDON)
941                 goto err_exit;
942
943         list_for_each (l, &slot->funcs) {
944                 func = list_entry(l, struct acpiphp_func, sibling);
945
946                 if (func->flags & FUNC_HAS_PS0) {
947                         dbg("%s: executing _PS0\n", __func__);
948                         status = acpi_evaluate_object(func->handle, "_PS0", NULL, NULL);
949                         if (ACPI_FAILURE(status)) {
950                                 warn("%s: _PS0 failed\n", __func__);
951                                 retval = -1;
952                                 goto err_exit;
953                         } else
954                                 break;
955                 }
956         }
957
958         /* TBD: evaluate _STA to check if the slot is enabled */
959
960         slot->flags |= SLOT_POWEREDON;
961
962  err_exit:
963         return retval;
964 }
965
966
967 static int power_off_slot(struct acpiphp_slot *slot)
968 {
969         acpi_status status;
970         struct acpiphp_func *func;
971         struct list_head *l;
972
973         int retval = 0;
974
975         /* if already disabled, just skip */
976         if ((slot->flags & SLOT_POWEREDON) == 0)
977                 goto err_exit;
978
979         list_for_each (l, &slot->funcs) {
980                 func = list_entry(l, struct acpiphp_func, sibling);
981
982                 if (func->flags & FUNC_HAS_PS3) {
983                         status = acpi_evaluate_object(func->handle, "_PS3", NULL, NULL);
984                         if (ACPI_FAILURE(status)) {
985                                 warn("%s: _PS3 failed\n", __func__);
986                                 retval = -1;
987                                 goto err_exit;
988                         } else
989                                 break;
990                 }
991         }
992
993         /* TBD: evaluate _STA to check if the slot is disabled */
994
995         slot->flags &= (~SLOT_POWEREDON);
996
997  err_exit:
998         return retval;
999 }
1000
1001
1002
1003 /**
1004  * acpiphp_max_busnr - return the highest reserved bus number under the given bus.
1005  * @bus: bus to start search with
1006  */
1007 static unsigned char acpiphp_max_busnr(struct pci_bus *bus)
1008 {
1009         struct list_head *tmp;
1010         unsigned char max, n;
1011
1012         /*
1013          * pci_bus_max_busnr will return the highest
1014          * reserved busnr for all these children.
1015          * that is equivalent to the bus->subordinate
1016          * value.  We don't want to use the parent's
1017          * bus->subordinate value because it could have
1018          * padding in it.
1019          */
1020         max = bus->secondary;
1021
1022         list_for_each(tmp, &bus->children) {
1023                 n = pci_bus_max_busnr(pci_bus_b(tmp));
1024                 if (n > max)
1025                         max = n;
1026         }
1027         return max;
1028 }
1029
1030
1031 /**
1032  * acpiphp_bus_add - add a new bus to acpi subsystem
1033  * @func: acpiphp_func of the bridge
1034  */
1035 static int acpiphp_bus_add(struct acpiphp_func *func)
1036 {
1037         acpi_handle phandle;
1038         struct acpi_device *device, *pdevice;
1039         int ret_val;
1040
1041         acpi_get_parent(func->handle, &phandle);
1042         if (acpi_bus_get_device(phandle, &pdevice)) {
1043                 dbg("no parent device, assuming NULL\n");
1044                 pdevice = NULL;
1045         }
1046         if (!acpi_bus_get_device(func->handle, &device)) {
1047                 dbg("bus exists... trim\n");
1048                 /* this shouldn't be in here, so remove
1049                  * the bus then re-add it...
1050                  */
1051                 ret_val = acpi_bus_trim(device, 1);
1052                 dbg("acpi_bus_trim return %x\n", ret_val);
1053         }
1054
1055         ret_val = acpi_bus_add(&device, pdevice, func->handle,
1056                 ACPI_BUS_TYPE_DEVICE);
1057         if (ret_val) {
1058                 dbg("error adding bus, %x\n",
1059                         -ret_val);
1060                 goto acpiphp_bus_add_out;
1061         }
1062         /*
1063          * try to start anyway.  We could have failed to add
1064          * simply because this bus had previously been added
1065          * on another add.  Don't bother with the return value
1066          * we just keep going.
1067          */
1068         ret_val = acpi_bus_start(device);
1069
1070 acpiphp_bus_add_out:
1071         return ret_val;
1072 }
1073
1074
1075 /**
1076  * acpiphp_bus_trim - trim a bus from acpi subsystem
1077  * @handle: handle to acpi namespace
1078  */
1079 static int acpiphp_bus_trim(acpi_handle handle)
1080 {
1081         struct acpi_device *device;
1082         int retval;
1083
1084         retval = acpi_bus_get_device(handle, &device);
1085         if (retval) {
1086                 dbg("acpi_device not found\n");
1087                 return retval;
1088         }
1089
1090         retval = acpi_bus_trim(device, 1);
1091         if (retval)
1092                 err("cannot remove from acpi list\n");
1093
1094         return retval;
1095 }
1096
1097 /**
1098  * enable_device - enable, configure a slot
1099  * @slot: slot to be enabled
1100  *
1101  * This function should be called per *physical slot*,
1102  * not per each slot object in ACPI namespace.
1103  */
1104 static int __ref enable_device(struct acpiphp_slot *slot)
1105 {
1106         struct pci_dev *dev;
1107         struct pci_bus *bus = slot->bridge->pci_bus;
1108         struct list_head *l;
1109         struct acpiphp_func *func;
1110         int retval = 0;
1111         int num, max, pass;
1112         acpi_status status;
1113
1114         if (slot->flags & SLOT_ENABLED)
1115                 goto err_exit;
1116
1117         /* sanity check: dev should be NULL when hot-plugged in */
1118         dev = pci_get_slot(bus, PCI_DEVFN(slot->device, 0));
1119         if (dev) {
1120                 /* This case shouldn't happen */
1121                 err("pci_dev structure already exists.\n");
1122                 pci_dev_put(dev);
1123                 retval = -1;
1124                 goto err_exit;
1125         }
1126
1127         num = pci_scan_slot(bus, PCI_DEVFN(slot->device, 0));
1128         if (num == 0) {
1129                 err("No new device found\n");
1130                 retval = -1;
1131                 goto err_exit;
1132         }
1133
1134         max = acpiphp_max_busnr(bus);
1135         for (pass = 0; pass < 2; pass++) {
1136                 list_for_each_entry(dev, &bus->devices, bus_list) {
1137                         if (PCI_SLOT(dev->devfn) != slot->device)
1138                                 continue;
1139                         if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
1140                             dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
1141                                 max = pci_scan_bridge(bus, dev, max, pass);
1142                                 if (pass && dev->subordinate)
1143                                         pci_bus_size_bridges(dev->subordinate);
1144                         }
1145                 }
1146         }
1147
1148         list_for_each (l, &slot->funcs) {
1149                 func = list_entry(l, struct acpiphp_func, sibling);
1150                 acpiphp_bus_add(func);
1151         }
1152
1153         pci_bus_assign_resources(bus);
1154         acpiphp_sanitize_bus(bus);
1155         acpiphp_set_hpp_values(slot->bridge->handle, bus);
1156         list_for_each_entry(func, &slot->funcs, sibling)
1157                 acpiphp_configure_ioapics(func->handle);
1158         pci_enable_bridges(bus);
1159         pci_bus_add_devices(bus);
1160
1161         /* associate pci_dev to our representation */
1162         list_for_each (l, &slot->funcs) {
1163                 func = list_entry(l, struct acpiphp_func, sibling);
1164                 func->pci_dev = pci_get_slot(bus, PCI_DEVFN(slot->device,
1165                                                         func->function));
1166                 if (!func->pci_dev)
1167                         continue;
1168
1169                 if (func->pci_dev->hdr_type != PCI_HEADER_TYPE_BRIDGE &&
1170                     func->pci_dev->hdr_type != PCI_HEADER_TYPE_CARDBUS)
1171                         continue;
1172
1173                 status = find_p2p_bridge(func->handle, (u32)1, bus, NULL);
1174                 if (ACPI_FAILURE(status))
1175                         warn("find_p2p_bridge failed (error code = 0x%x)\n",
1176                                 status);
1177         }
1178
1179         slot->flags |= SLOT_ENABLED;
1180
1181  err_exit:
1182         return retval;
1183 }
1184
1185 static void disable_bridges(struct pci_bus *bus)
1186 {
1187         struct pci_dev *dev;
1188         list_for_each_entry(dev, &bus->devices, bus_list) {
1189                 if (dev->subordinate) {
1190                         disable_bridges(dev->subordinate);
1191                         pci_disable_device(dev);
1192                 }
1193         }
1194 }
1195
1196 /**
1197  * disable_device - disable a slot
1198  * @slot: ACPI PHP slot
1199  */
1200 static int disable_device(struct acpiphp_slot *slot)
1201 {
1202         int retval = 0;
1203         struct acpiphp_func *func;
1204         struct list_head *l;
1205
1206         /* is this slot already disabled? */
1207         if (!(slot->flags & SLOT_ENABLED))
1208                 goto err_exit;
1209
1210         list_for_each (l, &slot->funcs) {
1211                 func = list_entry(l, struct acpiphp_func, sibling);
1212
1213                 if (func->bridge) {
1214                         /* cleanup p2p bridges under this P2P bridge */
1215                         cleanup_p2p_bridge(func->bridge->handle,
1216                                                 (u32)1, NULL, NULL);
1217                         func->bridge = NULL;
1218                 }
1219
1220                 if (func->pci_dev) {
1221                         pci_stop_bus_device(func->pci_dev);
1222                         if (func->pci_dev->subordinate) {
1223                                 disable_bridges(func->pci_dev->subordinate);
1224                                 pci_disable_device(func->pci_dev);
1225                         }
1226                 }
1227         }
1228
1229         list_for_each (l, &slot->funcs) {
1230                 func = list_entry(l, struct acpiphp_func, sibling);
1231
1232                 acpiphp_unconfigure_ioapics(func->handle);
1233                 acpiphp_bus_trim(func->handle);
1234                 /* try to remove anyway.
1235                  * acpiphp_bus_add might have been failed */
1236
1237                 if (!func->pci_dev)
1238                         continue;
1239
1240                 pci_remove_bus_device(func->pci_dev);
1241                 pci_dev_put(func->pci_dev);
1242                 func->pci_dev = NULL;
1243         }
1244
1245         slot->flags &= (~SLOT_ENABLED);
1246
1247  err_exit:
1248         return retval;
1249 }
1250
1251
1252 /**
1253  * get_slot_status - get ACPI slot status
1254  * @slot: ACPI PHP slot
1255  *
1256  * If a slot has _STA for each function and if any one of them
1257  * returned non-zero status, return it.
1258  *
1259  * If a slot doesn't have _STA and if any one of its functions'
1260  * configuration space is configured, return 0x0f as a _STA.
1261  *
1262  * Otherwise return 0.
1263  */
1264 static unsigned int get_slot_status(struct acpiphp_slot *slot)
1265 {
1266         acpi_status status;
1267         unsigned long long sta = 0;
1268         u32 dvid;
1269         struct list_head *l;
1270         struct acpiphp_func *func;
1271
1272         list_for_each (l, &slot->funcs) {
1273                 func = list_entry(l, struct acpiphp_func, sibling);
1274
1275                 if (func->flags & FUNC_HAS_STA) {
1276                         status = acpi_evaluate_integer(func->handle, "_STA", NULL, &sta);
1277                         if (ACPI_SUCCESS(status) && sta)
1278                                 break;
1279                 } else {
1280                         pci_bus_read_config_dword(slot->bridge->pci_bus,
1281                                                   PCI_DEVFN(slot->device,
1282                                                             func->function),
1283                                                   PCI_VENDOR_ID, &dvid);
1284                         if (dvid != 0xffffffff) {
1285                                 sta = ACPI_STA_ALL;
1286                                 break;
1287                         }
1288                 }
1289         }
1290
1291         return (unsigned int)sta;
1292 }
1293
1294 /**
1295  * acpiphp_eject_slot - physically eject the slot
1296  * @slot: ACPI PHP slot
1297  */
1298 int acpiphp_eject_slot(struct acpiphp_slot *slot)
1299 {
1300         acpi_status status;
1301         struct acpiphp_func *func;
1302         struct list_head *l;
1303         struct acpi_object_list arg_list;
1304         union acpi_object arg;
1305
1306         list_for_each (l, &slot->funcs) {
1307                 func = list_entry(l, struct acpiphp_func, sibling);
1308
1309                 /* We don't want to call _EJ0 on non-existing functions. */
1310                 if ((func->flags & FUNC_HAS_EJ0)) {
1311                         /* _EJ0 method take one argument */
1312                         arg_list.count = 1;
1313                         arg_list.pointer = &arg;
1314                         arg.type = ACPI_TYPE_INTEGER;
1315                         arg.integer.value = 1;
1316
1317                         status = acpi_evaluate_object(func->handle, "_EJ0", &arg_list, NULL);
1318                         if (ACPI_FAILURE(status)) {
1319                                 warn("%s: _EJ0 failed\n", __func__);
1320                                 return -1;
1321                         } else
1322                                 break;
1323                 }
1324         }
1325         return 0;
1326 }
1327
1328 /**
1329  * acpiphp_check_bridge - re-enumerate devices
1330  * @bridge: where to begin re-enumeration
1331  *
1332  * Iterate over all slots under this bridge and make sure that if a
1333  * card is present they are enabled, and if not they are disabled.
1334  */
1335 static int acpiphp_check_bridge(struct acpiphp_bridge *bridge)
1336 {
1337         struct acpiphp_slot *slot;
1338         int retval = 0;
1339         int enabled, disabled;
1340
1341         enabled = disabled = 0;
1342
1343         for (slot = bridge->slots; slot; slot = slot->next) {
1344                 unsigned int status = get_slot_status(slot);
1345                 if (slot->flags & SLOT_ENABLED) {
1346                         if (status == ACPI_STA_ALL)
1347                                 continue;
1348                         retval = acpiphp_disable_slot(slot);
1349                         if (retval) {
1350                                 err("Error occurred in disabling\n");
1351                                 goto err_exit;
1352                         } else {
1353                                 acpiphp_eject_slot(slot);
1354                         }
1355                         disabled++;
1356                 } else {
1357                         if (status != ACPI_STA_ALL)
1358                                 continue;
1359                         retval = acpiphp_enable_slot(slot);
1360                         if (retval) {
1361                                 err("Error occurred in enabling\n");
1362                                 goto err_exit;
1363                         }
1364                         enabled++;
1365                 }
1366         }
1367
1368         dbg("%s: %d enabled, %d disabled\n", __func__, enabled, disabled);
1369
1370  err_exit:
1371         return retval;
1372 }
1373
1374 static void program_hpp(struct pci_dev *dev, struct acpiphp_bridge *bridge)
1375 {
1376         u16 pci_cmd, pci_bctl;
1377         struct pci_dev *cdev;
1378
1379         /* Program hpp values for this device */
1380         if (!(dev->hdr_type == PCI_HEADER_TYPE_NORMAL ||
1381                         (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE &&
1382                         (dev->class >> 8) == PCI_CLASS_BRIDGE_PCI)))
1383                 return;
1384
1385         if ((dev->class >> 8) == PCI_CLASS_BRIDGE_HOST)
1386                 return;
1387
1388         pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE,
1389                         bridge->hpp.t0->cache_line_size);
1390         pci_write_config_byte(dev, PCI_LATENCY_TIMER,
1391                         bridge->hpp.t0->latency_timer);
1392         pci_read_config_word(dev, PCI_COMMAND, &pci_cmd);
1393         if (bridge->hpp.t0->enable_serr)
1394                 pci_cmd |= PCI_COMMAND_SERR;
1395         else
1396                 pci_cmd &= ~PCI_COMMAND_SERR;
1397         if (bridge->hpp.t0->enable_perr)
1398                 pci_cmd |= PCI_COMMAND_PARITY;
1399         else
1400                 pci_cmd &= ~PCI_COMMAND_PARITY;
1401         pci_write_config_word(dev, PCI_COMMAND, pci_cmd);
1402
1403         /* Program bridge control value and child devices */
1404         if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
1405                 pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER,
1406                                 bridge->hpp.t0->latency_timer);
1407                 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &pci_bctl);
1408                 if (bridge->hpp.t0->enable_serr)
1409                         pci_bctl |= PCI_BRIDGE_CTL_SERR;
1410                 else
1411                         pci_bctl &= ~PCI_BRIDGE_CTL_SERR;
1412                 if (bridge->hpp.t0->enable_perr)
1413                         pci_bctl |= PCI_BRIDGE_CTL_PARITY;
1414                 else
1415                         pci_bctl &= ~PCI_BRIDGE_CTL_PARITY;
1416                 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, pci_bctl);
1417                 if (dev->subordinate) {
1418                         list_for_each_entry(cdev, &dev->subordinate->devices,
1419                                         bus_list)
1420                                 program_hpp(cdev, bridge);
1421                 }
1422         }
1423 }
1424
1425 static void acpiphp_set_hpp_values(acpi_handle handle, struct pci_bus *bus)
1426 {
1427         struct acpiphp_bridge bridge;
1428         struct pci_dev *dev;
1429
1430         memset(&bridge, 0, sizeof(bridge));
1431         bridge.handle = handle;
1432         bridge.pci_bus = bus;
1433         bridge.pci_dev = bus->self;
1434         decode_hpp(&bridge);
1435         list_for_each_entry(dev, &bus->devices, bus_list)
1436                 program_hpp(dev, &bridge);
1437
1438 }
1439
1440 /*
1441  * Remove devices for which we could not assign resources, call
1442  * arch specific code to fix-up the bus
1443  */
1444 static void acpiphp_sanitize_bus(struct pci_bus *bus)
1445 {
1446         struct pci_dev *dev;
1447         int i;
1448         unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM;
1449
1450         list_for_each_entry(dev, &bus->devices, bus_list) {
1451                 for (i=0; i<PCI_BRIDGE_RESOURCES; i++) {
1452                         struct resource *res = &dev->resource[i];
1453                         if ((res->flags & type_mask) && !res->start &&
1454                                         res->end) {
1455                                 /* Could not assign a required resources
1456                                  * for this device, remove it */
1457                                 pci_remove_bus_device(dev);
1458                                 break;
1459                         }
1460                 }
1461         }
1462 }
1463
1464 /* Program resources in newly inserted bridge */
1465 static int acpiphp_configure_bridge (acpi_handle handle)
1466 {
1467         struct acpi_pci_id pci_id;
1468         struct pci_bus *bus;
1469
1470         if (ACPI_FAILURE(acpi_get_pci_id(handle, &pci_id))) {
1471                 err("cannot get PCI domain and bus number for bridge\n");
1472                 return -EINVAL;
1473         }
1474         bus = pci_find_bus(pci_id.segment, pci_id.bus);
1475         if (!bus) {
1476                 err("cannot find bus %d:%d\n",
1477                                 pci_id.segment, pci_id.bus);
1478                 return -EINVAL;
1479         }
1480
1481         pci_bus_size_bridges(bus);
1482         pci_bus_assign_resources(bus);
1483         acpiphp_sanitize_bus(bus);
1484         acpiphp_set_hpp_values(handle, bus);
1485         pci_enable_bridges(bus);
1486         acpiphp_configure_ioapics(handle);
1487         return 0;
1488 }
1489
1490 static void handle_bridge_insertion(acpi_handle handle, u32 type)
1491 {
1492         struct acpi_device *device, *pdevice;
1493         acpi_handle phandle;
1494
1495         if ((type != ACPI_NOTIFY_BUS_CHECK) &&
1496                         (type != ACPI_NOTIFY_DEVICE_CHECK)) {
1497                 err("unexpected notification type %d\n", type);
1498                 return;
1499         }
1500
1501         acpi_get_parent(handle, &phandle);
1502         if (acpi_bus_get_device(phandle, &pdevice)) {
1503                 dbg("no parent device, assuming NULL\n");
1504                 pdevice = NULL;
1505         }
1506         if (acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE)) {
1507                 err("cannot add bridge to acpi list\n");
1508                 return;
1509         }
1510         if (!acpiphp_configure_bridge(handle) &&
1511                 !acpi_bus_start(device))
1512                 add_bridge(handle);
1513         else
1514                 err("cannot configure and start bridge\n");
1515
1516 }
1517
1518 /*
1519  * ACPI event handlers
1520  */
1521
1522 static acpi_status
1523 count_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1524 {
1525         int *count = (int *)context;
1526         struct acpiphp_bridge *bridge;
1527
1528         bridge = acpiphp_handle_to_bridge(handle);
1529         if (bridge)
1530                 (*count)++;
1531         return AE_OK ;
1532 }
1533
1534 static acpi_status
1535 check_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1536 {
1537         struct acpiphp_bridge *bridge;
1538         char objname[64];
1539         struct acpi_buffer buffer = { .length = sizeof(objname),
1540                                       .pointer = objname };
1541
1542         bridge = acpiphp_handle_to_bridge(handle);
1543         if (bridge) {
1544                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1545                 dbg("%s: re-enumerating slots under %s\n",
1546                         __func__, objname);
1547                 acpiphp_check_bridge(bridge);
1548         }
1549         return AE_OK ;
1550 }
1551
1552 /**
1553  * handle_hotplug_event_bridge - handle ACPI event on bridges
1554  * @handle: Notify()'ed acpi_handle
1555  * @type: Notify code
1556  * @context: pointer to acpiphp_bridge structure
1557  *
1558  * Handles ACPI event notification on {host,p2p} bridges.
1559  */
1560 static void handle_hotplug_event_bridge(acpi_handle handle, u32 type, void *context)
1561 {
1562         struct acpiphp_bridge *bridge;
1563         char objname[64];
1564         struct acpi_buffer buffer = { .length = sizeof(objname),
1565                                       .pointer = objname };
1566         struct acpi_device *device;
1567         int num_sub_bridges = 0;
1568
1569         if (acpi_bus_get_device(handle, &device)) {
1570                 /* This bridge must have just been physically inserted */
1571                 handle_bridge_insertion(handle, type);
1572                 return;
1573         }
1574
1575         bridge = acpiphp_handle_to_bridge(handle);
1576         if (type == ACPI_NOTIFY_BUS_CHECK) {
1577                 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, ACPI_UINT32_MAX,
1578                         count_sub_bridges, &num_sub_bridges, NULL);
1579         }
1580
1581         if (!bridge && !num_sub_bridges) {
1582                 err("cannot get bridge info\n");
1583                 return;
1584         }
1585
1586         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1587
1588         switch (type) {
1589         case ACPI_NOTIFY_BUS_CHECK:
1590                 /* bus re-enumerate */
1591                 dbg("%s: Bus check notify on %s\n", __func__, objname);
1592                 if (bridge) {
1593                         dbg("%s: re-enumerating slots under %s\n",
1594                                 __func__, objname);
1595                         acpiphp_check_bridge(bridge);
1596                 }
1597                 if (num_sub_bridges)
1598                         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
1599                                 ACPI_UINT32_MAX, check_sub_bridges, NULL, NULL);
1600                 break;
1601
1602         case ACPI_NOTIFY_DEVICE_CHECK:
1603                 /* device check */
1604                 dbg("%s: Device check notify on %s\n", __func__, objname);
1605                 acpiphp_check_bridge(bridge);
1606                 break;
1607
1608         case ACPI_NOTIFY_DEVICE_WAKE:
1609                 /* wake event */
1610                 dbg("%s: Device wake notify on %s\n", __func__, objname);
1611                 break;
1612
1613         case ACPI_NOTIFY_EJECT_REQUEST:
1614                 /* request device eject */
1615                 dbg("%s: Device eject notify on %s\n", __func__, objname);
1616                 if ((bridge->type != BRIDGE_TYPE_HOST) &&
1617                     (bridge->flags & BRIDGE_HAS_EJ0)) {
1618                         struct acpiphp_slot *slot;
1619                         slot = bridge->func->slot;
1620                         if (!acpiphp_disable_slot(slot))
1621                                 acpiphp_eject_slot(slot);
1622                 }
1623                 break;
1624
1625         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
1626                 printk(KERN_ERR "Device %s cannot be configured due"
1627                                 " to a frequency mismatch\n", objname);
1628                 break;
1629
1630         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
1631                 printk(KERN_ERR "Device %s cannot be configured due"
1632                                 " to a bus mode mismatch\n", objname);
1633                 break;
1634
1635         case ACPI_NOTIFY_POWER_FAULT:
1636                 printk(KERN_ERR "Device %s has suffered a power fault\n",
1637                                 objname);
1638                 break;
1639
1640         default:
1641                 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
1642                 break;
1643         }
1644 }
1645
1646 /**
1647  * handle_hotplug_event_func - handle ACPI event on functions (i.e. slots)
1648  * @handle: Notify()'ed acpi_handle
1649  * @type: Notify code
1650  * @context: pointer to acpiphp_func structure
1651  *
1652  * Handles ACPI event notification on slots.
1653  */
1654 static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context)
1655 {
1656         struct acpiphp_func *func;
1657         char objname[64];
1658         struct acpi_buffer buffer = { .length = sizeof(objname),
1659                                       .pointer = objname };
1660
1661         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1662
1663         func = (struct acpiphp_func *)context;
1664
1665         switch (type) {
1666         case ACPI_NOTIFY_BUS_CHECK:
1667                 /* bus re-enumerate */
1668                 dbg("%s: Bus check notify on %s\n", __func__, objname);
1669                 acpiphp_enable_slot(func->slot);
1670                 break;
1671
1672         case ACPI_NOTIFY_DEVICE_CHECK:
1673                 /* device check : re-enumerate from parent bus */
1674                 dbg("%s: Device check notify on %s\n", __func__, objname);
1675                 acpiphp_check_bridge(func->slot->bridge);
1676                 break;
1677
1678         case ACPI_NOTIFY_DEVICE_WAKE:
1679                 /* wake event */
1680                 dbg("%s: Device wake notify on %s\n", __func__, objname);
1681                 break;
1682
1683         case ACPI_NOTIFY_EJECT_REQUEST:
1684                 /* request device eject */
1685                 dbg("%s: Device eject notify on %s\n", __func__, objname);
1686                 if (!(acpiphp_disable_slot(func->slot)))
1687                         acpiphp_eject_slot(func->slot);
1688                 break;
1689
1690         default:
1691                 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
1692                 break;
1693         }
1694 }
1695
1696
1697 static acpi_status
1698 find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1699 {
1700         int *count = (int *)context;
1701
1702         if (acpi_root_bridge(handle)) {
1703                 acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
1704                                 handle_hotplug_event_bridge, NULL);
1705                         (*count)++;
1706         }
1707         return AE_OK ;
1708 }
1709
1710 static struct acpi_pci_driver acpi_pci_hp_driver = {
1711         .add =          add_bridge,
1712         .remove =       remove_bridge,
1713 };
1714
1715 /**
1716  * acpiphp_glue_init - initializes all PCI hotplug - ACPI glue data structures
1717  */
1718 int __init acpiphp_glue_init(void)
1719 {
1720         int num = 0;
1721
1722         acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
1723                         ACPI_UINT32_MAX, find_root_bridges, &num, NULL);
1724
1725         if (num <= 0)
1726                 return -1;
1727         else
1728                 acpi_pci_register_driver(&acpi_pci_hp_driver);
1729
1730         return 0;
1731 }
1732
1733
1734 /**
1735  * acpiphp_glue_exit - terminates all PCI hotplug - ACPI glue data structures
1736  *
1737  * This function frees all data allocated in acpiphp_glue_init().
1738  */
1739 void  acpiphp_glue_exit(void)
1740 {
1741         acpi_pci_unregister_driver(&acpi_pci_hp_driver);
1742 }
1743
1744
1745 /**
1746  * acpiphp_get_num_slots - count number of slots in a system
1747  */
1748 int __init acpiphp_get_num_slots(void)
1749 {
1750         struct acpiphp_bridge *bridge;
1751         int num_slots = 0;
1752
1753         list_for_each_entry (bridge, &bridge_list, list) {
1754                 dbg("Bus %04x:%02x has %d slot%s\n",
1755                                 pci_domain_nr(bridge->pci_bus),
1756                                 bridge->pci_bus->number, bridge->nr_slots,
1757                                 bridge->nr_slots == 1 ? "" : "s");
1758                 num_slots += bridge->nr_slots;
1759         }
1760
1761         dbg("Total %d slots\n", num_slots);
1762         return num_slots;
1763 }
1764
1765
1766 #if 0
1767 /**
1768  * acpiphp_for_each_slot - call function for each slot
1769  * @fn: callback function
1770  * @data: context to be passed to callback function
1771  */
1772 static int acpiphp_for_each_slot(acpiphp_callback fn, void *data)
1773 {
1774         struct list_head *node;
1775         struct acpiphp_bridge *bridge;
1776         struct acpiphp_slot *slot;
1777         int retval = 0;
1778
1779         list_for_each (node, &bridge_list) {
1780                 bridge = (struct acpiphp_bridge *)node;
1781                 for (slot = bridge->slots; slot; slot = slot->next) {
1782                         retval = fn(slot, data);
1783                         if (!retval)
1784                                 goto err_exit;
1785                 }
1786         }
1787
1788  err_exit:
1789         return retval;
1790 }
1791 #endif
1792
1793
1794 /**
1795  * acpiphp_enable_slot - power on slot
1796  * @slot: ACPI PHP slot
1797  */
1798 int acpiphp_enable_slot(struct acpiphp_slot *slot)
1799 {
1800         int retval;
1801
1802         mutex_lock(&slot->crit_sect);
1803
1804         /* wake up all functions */
1805         retval = power_on_slot(slot);
1806         if (retval)
1807                 goto err_exit;
1808
1809         if (get_slot_status(slot) == ACPI_STA_ALL) {
1810                 /* configure all functions */
1811                 retval = enable_device(slot);
1812                 if (retval)
1813                         power_off_slot(slot);
1814         } else {
1815                 dbg("%s: Slot status is not ACPI_STA_ALL\n", __func__);
1816                 power_off_slot(slot);
1817         }
1818
1819  err_exit:
1820         mutex_unlock(&slot->crit_sect);
1821         return retval;
1822 }
1823
1824 /**
1825  * acpiphp_disable_slot - power off slot
1826  * @slot: ACPI PHP slot
1827  */
1828 int acpiphp_disable_slot(struct acpiphp_slot *slot)
1829 {
1830         int retval = 0;
1831
1832         mutex_lock(&slot->crit_sect);
1833
1834         /* unconfigure all functions */
1835         retval = disable_device(slot);
1836         if (retval)
1837                 goto err_exit;
1838
1839         /* power off all functions */
1840         retval = power_off_slot(slot);
1841         if (retval)
1842                 goto err_exit;
1843
1844  err_exit:
1845         mutex_unlock(&slot->crit_sect);
1846         return retval;
1847 }
1848
1849
1850 /*
1851  * slot enabled:  1
1852  * slot disabled: 0
1853  */
1854 u8 acpiphp_get_power_status(struct acpiphp_slot *slot)
1855 {
1856         return (slot->flags & SLOT_POWEREDON);
1857 }
1858
1859
1860 /*
1861  * latch   open:  1
1862  * latch closed:  0
1863  */
1864 u8 acpiphp_get_latch_status(struct acpiphp_slot *slot)
1865 {
1866         unsigned int sta;
1867
1868         sta = get_slot_status(slot);
1869
1870         return (sta & ACPI_STA_SHOW_IN_UI) ? 0 : 1;
1871 }
1872
1873
1874 /*
1875  * adapter presence : 1
1876  *          absence : 0
1877  */
1878 u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot)
1879 {
1880         unsigned int sta;
1881
1882         sta = get_slot_status(slot);
1883
1884         return (sta == 0) ? 0 : 1;
1885 }