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