Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
[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_bridge has its refcount elevated by pci_get_slot()
36  *    when the bridge is scanned and it loses a refcount when the bridge
37  *    is removed.
38  *  - When a P2P bridge is present, we elevate the refcount on the subordinate
39  *    bus. It loses the refcount when the the driver unloads.
40  */
41
42 #include <linux/init.h>
43 #include <linux/module.h>
44
45 #include <linux/kernel.h>
46 #include <linux/pci.h>
47 #include <linux/pci_hotplug.h>
48 #include <linux/pci-acpi.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 /* callback routine to check for the existence of a pci dock device */
66 static acpi_status
67 is_pci_dock_device(acpi_handle handle, u32 lvl, void *context, void **rv)
68 {
69         int *count = (int *)context;
70
71         if (is_dock_device(handle)) {
72                 (*count)++;
73                 return AE_CTRL_TERMINATE;
74         } else {
75                 return AE_OK;
76         }
77 }
78
79 /*
80  * the _DCK method can do funny things... and sometimes not
81  * hah-hah funny.
82  *
83  * TBD - figure out a way to only call fixups for
84  * systems that require them.
85  */
86 static int post_dock_fixups(struct notifier_block *nb, unsigned long val,
87         void *v)
88 {
89         struct acpiphp_func *func = container_of(nb, struct acpiphp_func, nb);
90         struct pci_bus *bus = func->slot->bridge->pci_bus;
91         u32 buses;
92
93         if (!bus->self)
94                 return  NOTIFY_OK;
95
96         /* fixup bad _DCK function that rewrites
97          * secondary bridge on slot
98          */
99         pci_read_config_dword(bus->self,
100                         PCI_PRIMARY_BUS,
101                         &buses);
102
103         if (((buses >> 8) & 0xff) != bus->secondary) {
104                 buses = (buses & 0xff000000)
105                         | ((unsigned int)(bus->primary)     <<  0)
106                         | ((unsigned int)(bus->secondary)   <<  8)
107                         | ((unsigned int)(bus->subordinate) << 16);
108                 pci_write_config_dword(bus->self, PCI_PRIMARY_BUS, buses);
109         }
110         return NOTIFY_OK;
111 }
112
113
114 static struct acpi_dock_ops acpiphp_dock_ops = {
115         .handler = handle_hotplug_event_func,
116 };
117
118 /* callback routine to register each ACPI PCI slot object */
119 static acpi_status
120 register_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
121 {
122         struct acpiphp_bridge *bridge = (struct acpiphp_bridge *)context;
123         struct acpiphp_slot *slot;
124         struct acpiphp_func *newfunc;
125         acpi_handle tmp;
126         acpi_status status = AE_OK;
127         unsigned long long adr, sun;
128         int device, function, retval;
129         struct pci_bus *pbus = bridge->pci_bus;
130         struct pci_dev *pdev;
131
132         if (!acpi_pci_check_ejectable(pbus, handle) && !is_dock_device(handle))
133                 return AE_OK;
134
135         acpi_evaluate_integer(handle, "_ADR", NULL, &adr);
136         device = (adr >> 16) & 0xffff;
137         function = adr & 0xffff;
138
139         newfunc = kzalloc(sizeof(struct acpiphp_func), GFP_KERNEL);
140         if (!newfunc)
141                 return AE_NO_MEMORY;
142
143         INIT_LIST_HEAD(&newfunc->sibling);
144         newfunc->handle = handle;
145         newfunc->function = function;
146
147         if (ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp)))
148                 newfunc->flags = FUNC_HAS_EJ0;
149
150         if (ACPI_SUCCESS(acpi_get_handle(handle, "_STA", &tmp)))
151                 newfunc->flags |= FUNC_HAS_STA;
152
153         if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS0", &tmp)))
154                 newfunc->flags |= FUNC_HAS_PS0;
155
156         if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS3", &tmp)))
157                 newfunc->flags |= FUNC_HAS_PS3;
158
159         if (ACPI_SUCCESS(acpi_get_handle(handle, "_DCK", &tmp)))
160                 newfunc->flags |= FUNC_HAS_DCK;
161
162         status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun);
163         if (ACPI_FAILURE(status)) {
164                 /*
165                  * use the count of the number of slots we've found
166                  * for the number of the slot
167                  */
168                 sun = bridge->nr_slots+1;
169         }
170
171         /* search for objects that share the same slot */
172         for (slot = bridge->slots; slot; slot = slot->next)
173                 if (slot->device == device) {
174                         if (slot->sun != sun)
175                                 warn("sibling found, but _SUN doesn't match!\n");
176                         break;
177                 }
178
179         if (!slot) {
180                 slot = kzalloc(sizeof(struct acpiphp_slot), GFP_KERNEL);
181                 if (!slot) {
182                         kfree(newfunc);
183                         return AE_NO_MEMORY;
184                 }
185
186                 slot->bridge = bridge;
187                 slot->device = device;
188                 slot->sun = sun;
189                 INIT_LIST_HEAD(&slot->funcs);
190                 mutex_init(&slot->crit_sect);
191
192                 slot->next = bridge->slots;
193                 bridge->slots = slot;
194
195                 bridge->nr_slots++;
196
197                 dbg("found ACPI PCI Hotplug slot %llu at PCI %04x:%02x:%02x\n",
198                     slot->sun, pci_domain_nr(pbus), pbus->number, device);
199                 retval = acpiphp_register_hotplug_slot(slot);
200                 if (retval) {
201                         if (retval == -EBUSY)
202                                 warn("Slot %llu already registered by another "
203                                         "hotplug driver\n", slot->sun);
204                         else
205                                 warn("acpiphp_register_hotplug_slot failed "
206                                         "(err code = 0x%x)\n", retval);
207                         goto err_exit;
208                 }
209         }
210
211         newfunc->slot = slot;
212         list_add_tail(&newfunc->sibling, &slot->funcs);
213
214         pdev = pci_get_slot(pbus, PCI_DEVFN(device, function));
215         if (pdev) {
216                 slot->flags |= (SLOT_ENABLED | SLOT_POWEREDON);
217                 pci_dev_put(pdev);
218         }
219
220         if (is_dock_device(handle)) {
221                 /* we don't want to call this device's _EJ0
222                  * because we want the dock notify handler
223                  * to call it after it calls _DCK
224                  */
225                 newfunc->flags &= ~FUNC_HAS_EJ0;
226                 if (register_hotplug_dock_device(handle,
227                         &acpiphp_dock_ops, newfunc))
228                         dbg("failed to register dock device\n");
229
230                 /* we need to be notified when dock events happen
231                  * outside of the hotplug operation, since we may
232                  * need to do fixups before we can hotplug.
233                  */
234                 newfunc->nb.notifier_call = post_dock_fixups;
235                 if (register_dock_notifier(&newfunc->nb))
236                         dbg("failed to register a dock notifier");
237         }
238
239         /* install notify handler */
240         if (!(newfunc->flags & FUNC_HAS_DCK)) {
241                 status = acpi_install_notify_handler(handle,
242                                              ACPI_SYSTEM_NOTIFY,
243                                              handle_hotplug_event_func,
244                                              newfunc);
245
246                 if (ACPI_FAILURE(status))
247                         err("failed to register interrupt notify handler\n");
248         } else
249                 status = AE_OK;
250
251         return status;
252
253  err_exit:
254         bridge->nr_slots--;
255         bridge->slots = slot->next;
256         kfree(slot);
257         kfree(newfunc);
258
259         return AE_OK;
260 }
261
262
263 /* see if it's worth looking at this bridge */
264 static int detect_ejectable_slots(struct pci_bus *pbus)
265 {
266         int found = acpi_pci_detect_ejectable(pbus);
267         if (!found) {
268                 acpi_handle bridge_handle = acpi_pci_get_bridge_handle(pbus);
269                 if (!bridge_handle)
270                         return 0;
271                 acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge_handle, (u32)1,
272                                     is_pci_dock_device, (void *)&found, NULL);
273         }
274         return found;
275 }
276
277
278 /* decode ACPI 2.0 _HPP hot plug parameters */
279 static void decode_hpp(struct acpiphp_bridge *bridge)
280 {
281         acpi_status status;
282
283         status = acpi_get_hp_params_from_firmware(bridge->pci_bus, &bridge->hpp);
284         if (ACPI_FAILURE(status) ||
285             !bridge->hpp.t0 || (bridge->hpp.t0->revision > 1)) {
286                 /* use default numbers */
287                 printk(KERN_WARNING
288                        "%s: Could not get hotplug parameters. Use defaults\n",
289                        __func__);
290                 bridge->hpp.t0 = &bridge->hpp.type0_data;
291                 bridge->hpp.t0->revision = 0;
292                 bridge->hpp.t0->cache_line_size = 0x10;
293                 bridge->hpp.t0->latency_timer = 0x40;
294                 bridge->hpp.t0->enable_serr = 0;
295                 bridge->hpp.t0->enable_perr = 0;
296         }
297 }
298
299
300
301 /* initialize miscellaneous stuff for both root and PCI-to-PCI bridge */
302 static void init_bridge_misc(struct acpiphp_bridge *bridge)
303 {
304         acpi_status status;
305
306         /* decode ACPI 2.0 _HPP (hot plug parameters) */
307         decode_hpp(bridge);
308
309         /* must be added to the list prior to calling register_slot */
310         list_add(&bridge->list, &bridge_list);
311
312         /* register all slot objects under this bridge */
313         status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge->handle, (u32)1,
314                                      register_slot, bridge, NULL);
315         if (ACPI_FAILURE(status)) {
316                 list_del(&bridge->list);
317                 return;
318         }
319
320         /* install notify handler */
321         if (bridge->type != BRIDGE_TYPE_HOST) {
322                 if ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func) {
323                         status = acpi_remove_notify_handler(bridge->func->handle,
324                                                 ACPI_SYSTEM_NOTIFY,
325                                                 handle_hotplug_event_func);
326                         if (ACPI_FAILURE(status))
327                                 err("failed to remove notify handler\n");
328                 }
329                 status = acpi_install_notify_handler(bridge->handle,
330                                              ACPI_SYSTEM_NOTIFY,
331                                              handle_hotplug_event_bridge,
332                                              bridge);
333
334                 if (ACPI_FAILURE(status)) {
335                         err("failed to register interrupt notify handler\n");
336                 }
337         }
338 }
339
340
341 /* find acpiphp_func from acpiphp_bridge */
342 static struct acpiphp_func *acpiphp_bridge_handle_to_function(acpi_handle handle)
343 {
344         struct list_head *node, *l;
345         struct acpiphp_bridge *bridge;
346         struct acpiphp_slot *slot;
347         struct acpiphp_func *func;
348
349         list_for_each(node, &bridge_list) {
350                 bridge = list_entry(node, struct acpiphp_bridge, list);
351                 for (slot = bridge->slots; slot; slot = slot->next) {
352                         list_for_each(l, &slot->funcs) {
353                                 func = list_entry(l, struct acpiphp_func,
354                                                         sibling);
355                                 if (func->handle == handle)
356                                         return func;
357                         }
358                 }
359         }
360
361         return NULL;
362 }
363
364
365 static inline void config_p2p_bridge_flags(struct acpiphp_bridge *bridge)
366 {
367         acpi_handle dummy_handle;
368
369         if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
370                                         "_STA", &dummy_handle)))
371                 bridge->flags |= BRIDGE_HAS_STA;
372
373         if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
374                                         "_EJ0", &dummy_handle)))
375                 bridge->flags |= BRIDGE_HAS_EJ0;
376
377         if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
378                                         "_PS0", &dummy_handle)))
379                 bridge->flags |= BRIDGE_HAS_PS0;
380
381         if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
382                                         "_PS3", &dummy_handle)))
383                 bridge->flags |= BRIDGE_HAS_PS3;
384
385         /* is this ejectable p2p bridge? */
386         if (bridge->flags & BRIDGE_HAS_EJ0) {
387                 struct acpiphp_func *func;
388
389                 dbg("found ejectable p2p bridge\n");
390
391                 /* make link between PCI bridge and PCI function */
392                 func = acpiphp_bridge_handle_to_function(bridge->handle);
393                 if (!func)
394                         return;
395                 bridge->func = func;
396                 func->bridge = bridge;
397         }
398 }
399
400
401 /* allocate and initialize host bridge data structure */
402 static void add_host_bridge(acpi_handle *handle, struct pci_bus *pci_bus)
403 {
404         struct acpiphp_bridge *bridge;
405
406         bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
407         if (bridge == NULL)
408                 return;
409
410         bridge->type = BRIDGE_TYPE_HOST;
411         bridge->handle = handle;
412
413         bridge->pci_bus = pci_bus;
414
415         spin_lock_init(&bridge->res_lock);
416
417         init_bridge_misc(bridge);
418 }
419
420
421 /* allocate and initialize PCI-to-PCI bridge data structure */
422 static void add_p2p_bridge(acpi_handle *handle, struct pci_dev *pci_dev)
423 {
424         struct acpiphp_bridge *bridge;
425
426         bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
427         if (bridge == NULL) {
428                 err("out of memory\n");
429                 return;
430         }
431
432         bridge->type = BRIDGE_TYPE_P2P;
433         bridge->handle = handle;
434         config_p2p_bridge_flags(bridge);
435
436         bridge->pci_dev = pci_dev_get(pci_dev);
437         bridge->pci_bus = pci_dev->subordinate;
438         if (!bridge->pci_bus) {
439                 err("This is not a PCI-to-PCI bridge!\n");
440                 goto err;
441         }
442
443         /*
444          * Grab a ref to the subordinate PCI bus in case the bus is
445          * removed via PCI core logical hotplug. The ref pins the bus
446          * (which we access during module unload).
447          */
448         get_device(&bridge->pci_bus->dev);
449         spin_lock_init(&bridge->res_lock);
450
451         init_bridge_misc(bridge);
452         return;
453  err:
454         pci_dev_put(pci_dev);
455         kfree(bridge);
456         return;
457 }
458
459
460 /* callback routine to find P2P bridges */
461 static acpi_status
462 find_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
463 {
464         acpi_status status;
465         acpi_handle dummy_handle;
466         unsigned long long tmp;
467         int device, function;
468         struct pci_dev *dev;
469         struct pci_bus *pci_bus = context;
470
471         status = acpi_get_handle(handle, "_ADR", &dummy_handle);
472         if (ACPI_FAILURE(status))
473                 return AE_OK;           /* continue */
474
475         status = acpi_evaluate_integer(handle, "_ADR", NULL, &tmp);
476         if (ACPI_FAILURE(status)) {
477                 dbg("%s: _ADR evaluation failure\n", __func__);
478                 return AE_OK;
479         }
480
481         device = (tmp >> 16) & 0xffff;
482         function = tmp & 0xffff;
483
484         dev = pci_get_slot(pci_bus, PCI_DEVFN(device, function));
485
486         if (!dev || !dev->subordinate)
487                 goto out;
488
489         /* check if this bridge has ejectable slots */
490         if ((detect_ejectable_slots(dev->subordinate) > 0)) {
491                 dbg("found PCI-to-PCI bridge at PCI %s\n", pci_name(dev));
492                 add_p2p_bridge(handle, dev);
493         }
494
495         /* search P2P bridges under this p2p bridge */
496         status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
497                                      find_p2p_bridge, dev->subordinate, NULL);
498         if (ACPI_FAILURE(status))
499                 warn("find_p2p_bridge failed (error code = 0x%x)\n", status);
500
501  out:
502         pci_dev_put(dev);
503         return AE_OK;
504 }
505
506
507 /* find hot-pluggable slots, and then find P2P bridge */
508 static int add_bridge(acpi_handle handle)
509 {
510         acpi_status status;
511         unsigned long long tmp;
512         int seg, bus;
513         acpi_handle dummy_handle;
514         struct pci_bus *pci_bus;
515
516         /* if the bridge doesn't have _STA, we assume it is always there */
517         status = acpi_get_handle(handle, "_STA", &dummy_handle);
518         if (ACPI_SUCCESS(status)) {
519                 status = acpi_evaluate_integer(handle, "_STA", NULL, &tmp);
520                 if (ACPI_FAILURE(status)) {
521                         dbg("%s: _STA evaluation failure\n", __func__);
522                         return 0;
523                 }
524                 if ((tmp & ACPI_STA_FUNCTIONING) == 0)
525                         /* don't register this object */
526                         return 0;
527         }
528
529         /* get PCI segment number */
530         status = acpi_evaluate_integer(handle, "_SEG", NULL, &tmp);
531
532         seg = ACPI_SUCCESS(status) ? tmp : 0;
533
534         /* get PCI bus number */
535         status = acpi_evaluate_integer(handle, "_BBN", NULL, &tmp);
536
537         if (ACPI_SUCCESS(status)) {
538                 bus = tmp;
539         } else {
540                 warn("can't get bus number, assuming 0\n");
541                 bus = 0;
542         }
543
544         pci_bus = pci_find_bus(seg, bus);
545         if (!pci_bus) {
546                 err("Can't find bus %04x:%02x\n", seg, bus);
547                 return 0;
548         }
549
550         /* check if this bridge has ejectable slots */
551         if (detect_ejectable_slots(pci_bus) > 0) {
552                 dbg("found PCI host-bus bridge with hot-pluggable slots\n");
553                 add_host_bridge(handle, pci_bus);
554         }
555
556         /* search P2P bridges under this host bridge */
557         status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
558                                      find_p2p_bridge, pci_bus, NULL);
559
560         if (ACPI_FAILURE(status))
561                 warn("find_p2p_bridge failed (error code = 0x%x)\n", status);
562
563         return 0;
564 }
565
566 static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle)
567 {
568         struct list_head *head;
569         list_for_each(head, &bridge_list) {
570                 struct acpiphp_bridge *bridge = list_entry(head,
571                                                 struct acpiphp_bridge, list);
572                 if (bridge->handle == handle)
573                         return bridge;
574         }
575
576         return NULL;
577 }
578
579 static void cleanup_bridge(struct acpiphp_bridge *bridge)
580 {
581         struct list_head *list, *tmp;
582         struct acpiphp_slot *slot;
583         acpi_status status;
584         acpi_handle handle = bridge->handle;
585
586         status = acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
587                                             handle_hotplug_event_bridge);
588         if (ACPI_FAILURE(status))
589                 err("failed to remove notify handler\n");
590
591         if ((bridge->type != BRIDGE_TYPE_HOST) &&
592             ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func)) {
593                 status = acpi_install_notify_handler(bridge->func->handle,
594                                                 ACPI_SYSTEM_NOTIFY,
595                                                 handle_hotplug_event_func,
596                                                 bridge->func);
597                 if (ACPI_FAILURE(status))
598                         err("failed to install interrupt notify handler\n");
599         }
600
601         slot = bridge->slots;
602         while (slot) {
603                 struct acpiphp_slot *next = slot->next;
604                 list_for_each_safe (list, tmp, &slot->funcs) {
605                         struct acpiphp_func *func;
606                         func = list_entry(list, struct acpiphp_func, sibling);
607                         if (is_dock_device(func->handle)) {
608                                 unregister_hotplug_dock_device(func->handle);
609                                 unregister_dock_notifier(&func->nb);
610                         }
611                         if (!(func->flags & FUNC_HAS_DCK)) {
612                                 status = acpi_remove_notify_handler(func->handle,
613                                                 ACPI_SYSTEM_NOTIFY,
614                                                 handle_hotplug_event_func);
615                                 if (ACPI_FAILURE(status))
616                                         err("failed to remove notify handler\n");
617                         }
618                         list_del(list);
619                         kfree(func);
620                 }
621                 acpiphp_unregister_hotplug_slot(slot);
622                 list_del(&slot->funcs);
623                 kfree(slot);
624                 slot = next;
625         }
626
627         /*
628          * Only P2P bridges have a pci_dev
629          */
630         if (bridge->pci_dev)
631                 put_device(&bridge->pci_bus->dev);
632
633         pci_dev_put(bridge->pci_dev);
634         list_del(&bridge->list);
635         kfree(bridge);
636 }
637
638 static acpi_status
639 cleanup_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
640 {
641         struct acpiphp_bridge *bridge;
642
643         /* cleanup p2p bridges under this P2P bridge
644            in a depth-first manner */
645         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
646                                 cleanup_p2p_bridge, NULL, NULL);
647
648         bridge = acpiphp_handle_to_bridge(handle);
649         if (bridge)
650                 cleanup_bridge(bridge);
651
652         return AE_OK;
653 }
654
655 static void remove_bridge(acpi_handle handle)
656 {
657         struct acpiphp_bridge *bridge;
658
659         /* cleanup p2p bridges under this host bridge
660            in a depth-first manner */
661         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
662                                 (u32)1, cleanup_p2p_bridge, NULL, NULL);
663
664         /*
665          * On root bridges with hotplug slots directly underneath (ie,
666          * no p2p bridge inbetween), we call cleanup_bridge(). 
667          *
668          * The else clause cleans up root bridges that either had no
669          * hotplug slots at all, or had a p2p bridge underneath.
670          */
671         bridge = acpiphp_handle_to_bridge(handle);
672         if (bridge)
673                 cleanup_bridge(bridge);
674         else
675                 acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
676                                            handle_hotplug_event_bridge);
677 }
678
679 static struct pci_dev * get_apic_pci_info(acpi_handle handle)
680 {
681         struct acpi_pci_id id;
682         struct pci_bus *bus;
683         struct pci_dev *dev;
684
685         if (ACPI_FAILURE(acpi_get_pci_id(handle, &id)))
686                 return NULL;
687
688         bus = pci_find_bus(id.segment, id.bus);
689         if (!bus)
690                 return NULL;
691
692         dev = pci_get_slot(bus, PCI_DEVFN(id.device, id.function));
693         if (!dev)
694                 return NULL;
695
696         if ((dev->class != PCI_CLASS_SYSTEM_PIC_IOAPIC) &&
697             (dev->class != PCI_CLASS_SYSTEM_PIC_IOXAPIC))
698         {
699                 pci_dev_put(dev);
700                 return NULL;
701         }
702
703         return dev;
704 }
705
706 static int get_gsi_base(acpi_handle handle, u32 *gsi_base)
707 {
708         acpi_status status;
709         int result = -1;
710         unsigned long long gsb;
711         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
712         union acpi_object *obj;
713         void *table;
714
715         status = acpi_evaluate_integer(handle, "_GSB", NULL, &gsb);
716         if (ACPI_SUCCESS(status)) {
717                 *gsi_base = (u32)gsb;
718                 return 0;
719         }
720
721         status = acpi_evaluate_object(handle, "_MAT", NULL, &buffer);
722         if (ACPI_FAILURE(status) || !buffer.length || !buffer.pointer)
723                 return -1;
724
725         obj = buffer.pointer;
726         if (obj->type != ACPI_TYPE_BUFFER)
727                 goto out;
728
729         table = obj->buffer.pointer;
730         switch (((struct acpi_subtable_header *)table)->type) {
731         case ACPI_MADT_TYPE_IO_SAPIC:
732                 *gsi_base = ((struct acpi_madt_io_sapic *)table)->global_irq_base;
733                 result = 0;
734                 break;
735         case ACPI_MADT_TYPE_IO_APIC:
736                 *gsi_base = ((struct acpi_madt_io_apic *)table)->global_irq_base;
737                 result = 0;
738                 break;
739         default:
740                 break;
741         }
742  out:
743         kfree(buffer.pointer);
744         return result;
745 }
746
747 static acpi_status
748 ioapic_add(acpi_handle handle, u32 lvl, void *context, void **rv)
749 {
750         acpi_status status;
751         unsigned long long sta;
752         acpi_handle tmp;
753         struct pci_dev *pdev;
754         u32 gsi_base;
755         u64 phys_addr;
756         struct acpiphp_ioapic *ioapic;
757
758         /* Evaluate _STA if present */
759         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
760         if (ACPI_SUCCESS(status) && sta != ACPI_STA_ALL)
761                 return AE_CTRL_DEPTH;
762
763         /* Scan only PCI bus scope */
764         status = acpi_get_handle(handle, "_HID", &tmp);
765         if (ACPI_SUCCESS(status))
766                 return AE_CTRL_DEPTH;
767
768         if (get_gsi_base(handle, &gsi_base))
769                 return AE_OK;
770
771         ioapic = kmalloc(sizeof(*ioapic), GFP_KERNEL);
772         if (!ioapic)
773                 return AE_NO_MEMORY;
774
775         pdev = get_apic_pci_info(handle);
776         if (!pdev)
777                 goto exit_kfree;
778
779         if (pci_enable_device(pdev))
780                 goto exit_pci_dev_put;
781
782         pci_set_master(pdev);
783
784         if (pci_request_region(pdev, 0, "I/O APIC(acpiphp)"))
785                 goto exit_pci_disable_device;
786
787         phys_addr = pci_resource_start(pdev, 0);
788         if (acpi_register_ioapic(handle, phys_addr, gsi_base))
789                 goto exit_pci_release_region;
790
791         ioapic->gsi_base = gsi_base;
792         ioapic->dev = pdev;
793         spin_lock(&ioapic_list_lock);
794         list_add_tail(&ioapic->list, &ioapic_list);
795         spin_unlock(&ioapic_list_lock);
796
797         return AE_OK;
798
799  exit_pci_release_region:
800         pci_release_region(pdev, 0);
801  exit_pci_disable_device:
802         pci_disable_device(pdev);
803  exit_pci_dev_put:
804         pci_dev_put(pdev);
805  exit_kfree:
806         kfree(ioapic);
807
808         return AE_OK;
809 }
810
811 static acpi_status
812 ioapic_remove(acpi_handle handle, u32 lvl, void *context, void **rv)
813 {
814         acpi_status status;
815         unsigned long long sta;
816         acpi_handle tmp;
817         u32 gsi_base;
818         struct acpiphp_ioapic *pos, *n, *ioapic = NULL;
819
820         /* Evaluate _STA if present */
821         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
822         if (ACPI_SUCCESS(status) && sta != ACPI_STA_ALL)
823                 return AE_CTRL_DEPTH;
824
825         /* Scan only PCI bus scope */
826         status = acpi_get_handle(handle, "_HID", &tmp);
827         if (ACPI_SUCCESS(status))
828                 return AE_CTRL_DEPTH;
829
830         if (get_gsi_base(handle, &gsi_base))
831                 return AE_OK;
832
833         acpi_unregister_ioapic(handle, gsi_base);
834
835         spin_lock(&ioapic_list_lock);
836         list_for_each_entry_safe(pos, n, &ioapic_list, list) {
837                 if (pos->gsi_base != gsi_base)
838                         continue;
839                 ioapic = pos;
840                 list_del(&ioapic->list);
841                 break;
842         }
843         spin_unlock(&ioapic_list_lock);
844
845         if (!ioapic)
846                 return AE_OK;
847
848         pci_release_region(ioapic->dev, 0);
849         pci_disable_device(ioapic->dev);
850         pci_dev_put(ioapic->dev);
851         kfree(ioapic);
852
853         return AE_OK;
854 }
855
856 static int acpiphp_configure_ioapics(acpi_handle handle)
857 {
858         ioapic_add(handle, 0, NULL, NULL);
859         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
860                             ACPI_UINT32_MAX, ioapic_add, NULL, NULL);
861         return 0;
862 }
863
864 static int acpiphp_unconfigure_ioapics(acpi_handle handle)
865 {
866         ioapic_remove(handle, 0, NULL, NULL);
867         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
868                             ACPI_UINT32_MAX, ioapic_remove, NULL, NULL);
869         return 0;
870 }
871
872 static int power_on_slot(struct acpiphp_slot *slot)
873 {
874         acpi_status status;
875         struct acpiphp_func *func;
876         struct list_head *l;
877         int retval = 0;
878
879         /* if already enabled, just skip */
880         if (slot->flags & SLOT_POWEREDON)
881                 goto err_exit;
882
883         list_for_each (l, &slot->funcs) {
884                 func = list_entry(l, struct acpiphp_func, sibling);
885
886                 if (func->flags & FUNC_HAS_PS0) {
887                         dbg("%s: executing _PS0\n", __func__);
888                         status = acpi_evaluate_object(func->handle, "_PS0", NULL, NULL);
889                         if (ACPI_FAILURE(status)) {
890                                 warn("%s: _PS0 failed\n", __func__);
891                                 retval = -1;
892                                 goto err_exit;
893                         } else
894                                 break;
895                 }
896         }
897
898         /* TBD: evaluate _STA to check if the slot is enabled */
899
900         slot->flags |= SLOT_POWEREDON;
901
902  err_exit:
903         return retval;
904 }
905
906
907 static int power_off_slot(struct acpiphp_slot *slot)
908 {
909         acpi_status status;
910         struct acpiphp_func *func;
911         struct list_head *l;
912
913         int retval = 0;
914
915         /* if already disabled, just skip */
916         if ((slot->flags & SLOT_POWEREDON) == 0)
917                 goto err_exit;
918
919         list_for_each (l, &slot->funcs) {
920                 func = list_entry(l, struct acpiphp_func, sibling);
921
922                 if (func->flags & FUNC_HAS_PS3) {
923                         status = acpi_evaluate_object(func->handle, "_PS3", NULL, NULL);
924                         if (ACPI_FAILURE(status)) {
925                                 warn("%s: _PS3 failed\n", __func__);
926                                 retval = -1;
927                                 goto err_exit;
928                         } else
929                                 break;
930                 }
931         }
932
933         /* TBD: evaluate _STA to check if the slot is disabled */
934
935         slot->flags &= (~SLOT_POWEREDON);
936
937  err_exit:
938         return retval;
939 }
940
941
942
943 /**
944  * acpiphp_max_busnr - return the highest reserved bus number under the given bus.
945  * @bus: bus to start search with
946  */
947 static unsigned char acpiphp_max_busnr(struct pci_bus *bus)
948 {
949         struct list_head *tmp;
950         unsigned char max, n;
951
952         /*
953          * pci_bus_max_busnr will return the highest
954          * reserved busnr for all these children.
955          * that is equivalent to the bus->subordinate
956          * value.  We don't want to use the parent's
957          * bus->subordinate value because it could have
958          * padding in it.
959          */
960         max = bus->secondary;
961
962         list_for_each(tmp, &bus->children) {
963                 n = pci_bus_max_busnr(pci_bus_b(tmp));
964                 if (n > max)
965                         max = n;
966         }
967         return max;
968 }
969
970
971 /**
972  * acpiphp_bus_add - add a new bus to acpi subsystem
973  * @func: acpiphp_func of the bridge
974  */
975 static int acpiphp_bus_add(struct acpiphp_func *func)
976 {
977         acpi_handle phandle;
978         struct acpi_device *device, *pdevice;
979         int ret_val;
980
981         acpi_get_parent(func->handle, &phandle);
982         if (acpi_bus_get_device(phandle, &pdevice)) {
983                 dbg("no parent device, assuming NULL\n");
984                 pdevice = NULL;
985         }
986         if (!acpi_bus_get_device(func->handle, &device)) {
987                 dbg("bus exists... trim\n");
988                 /* this shouldn't be in here, so remove
989                  * the bus then re-add it...
990                  */
991                 ret_val = acpi_bus_trim(device, 1);
992                 dbg("acpi_bus_trim return %x\n", ret_val);
993         }
994
995         ret_val = acpi_bus_add(&device, pdevice, func->handle,
996                 ACPI_BUS_TYPE_DEVICE);
997         if (ret_val) {
998                 dbg("error adding bus, %x\n",
999                         -ret_val);
1000                 goto acpiphp_bus_add_out;
1001         }
1002         /*
1003          * try to start anyway.  We could have failed to add
1004          * simply because this bus had previously been added
1005          * on another add.  Don't bother with the return value
1006          * we just keep going.
1007          */
1008         ret_val = acpi_bus_start(device);
1009
1010 acpiphp_bus_add_out:
1011         return ret_val;
1012 }
1013
1014
1015 /**
1016  * acpiphp_bus_trim - trim a bus from acpi subsystem
1017  * @handle: handle to acpi namespace
1018  */
1019 static int acpiphp_bus_trim(acpi_handle handle)
1020 {
1021         struct acpi_device *device;
1022         int retval;
1023
1024         retval = acpi_bus_get_device(handle, &device);
1025         if (retval) {
1026                 dbg("acpi_device not found\n");
1027                 return retval;
1028         }
1029
1030         retval = acpi_bus_trim(device, 1);
1031         if (retval)
1032                 err("cannot remove from acpi list\n");
1033
1034         return retval;
1035 }
1036
1037 /**
1038  * enable_device - enable, configure a slot
1039  * @slot: slot to be enabled
1040  *
1041  * This function should be called per *physical slot*,
1042  * not per each slot object in ACPI namespace.
1043  */
1044 static int __ref enable_device(struct acpiphp_slot *slot)
1045 {
1046         struct pci_dev *dev;
1047         struct pci_bus *bus = slot->bridge->pci_bus;
1048         struct list_head *l;
1049         struct acpiphp_func *func;
1050         int retval = 0;
1051         int num, max, pass;
1052         acpi_status status;
1053
1054         if (slot->flags & SLOT_ENABLED)
1055                 goto err_exit;
1056
1057         /* sanity check: dev should be NULL when hot-plugged in */
1058         dev = pci_get_slot(bus, PCI_DEVFN(slot->device, 0));
1059         if (dev) {
1060                 /* This case shouldn't happen */
1061                 err("pci_dev structure already exists.\n");
1062                 pci_dev_put(dev);
1063                 retval = -1;
1064                 goto err_exit;
1065         }
1066
1067         num = pci_scan_slot(bus, PCI_DEVFN(slot->device, 0));
1068         if (num == 0) {
1069                 err("No new device found\n");
1070                 retval = -1;
1071                 goto err_exit;
1072         }
1073
1074         max = acpiphp_max_busnr(bus);
1075         for (pass = 0; pass < 2; pass++) {
1076                 list_for_each_entry(dev, &bus->devices, bus_list) {
1077                         if (PCI_SLOT(dev->devfn) != slot->device)
1078                                 continue;
1079                         if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
1080                             dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
1081                                 max = pci_scan_bridge(bus, dev, max, pass);
1082                                 if (pass && dev->subordinate)
1083                                         pci_bus_size_bridges(dev->subordinate);
1084                         }
1085                 }
1086         }
1087
1088         list_for_each (l, &slot->funcs) {
1089                 func = list_entry(l, struct acpiphp_func, sibling);
1090                 acpiphp_bus_add(func);
1091         }
1092
1093         pci_bus_assign_resources(bus);
1094         acpiphp_sanitize_bus(bus);
1095         acpiphp_set_hpp_values(slot->bridge->handle, bus);
1096         list_for_each_entry(func, &slot->funcs, sibling)
1097                 acpiphp_configure_ioapics(func->handle);
1098         pci_enable_bridges(bus);
1099         pci_bus_add_devices(bus);
1100
1101         list_for_each (l, &slot->funcs) {
1102                 func = list_entry(l, struct acpiphp_func, sibling);
1103                 dev = pci_get_slot(bus, PCI_DEVFN(slot->device,
1104                                                   func->function));
1105                 if (!dev)
1106                         continue;
1107
1108                 if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE &&
1109                     dev->hdr_type != PCI_HEADER_TYPE_CARDBUS) {
1110                         pci_dev_put(dev);
1111                         continue;
1112                 }
1113
1114                 status = find_p2p_bridge(func->handle, (u32)1, bus, NULL);
1115                 if (ACPI_FAILURE(status))
1116                         warn("find_p2p_bridge failed (error code = 0x%x)\n",
1117                                 status);
1118                 pci_dev_put(dev);
1119         }
1120
1121         slot->flags |= SLOT_ENABLED;
1122
1123  err_exit:
1124         return retval;
1125 }
1126
1127 static void disable_bridges(struct pci_bus *bus)
1128 {
1129         struct pci_dev *dev;
1130         list_for_each_entry(dev, &bus->devices, bus_list) {
1131                 if (dev->subordinate) {
1132                         disable_bridges(dev->subordinate);
1133                         pci_disable_device(dev);
1134                 }
1135         }
1136 }
1137
1138 /**
1139  * disable_device - disable a slot
1140  * @slot: ACPI PHP slot
1141  */
1142 static int disable_device(struct acpiphp_slot *slot)
1143 {
1144         struct acpiphp_func *func;
1145         struct pci_dev *pdev;
1146
1147         /* is this slot already disabled? */
1148         if (!(slot->flags & SLOT_ENABLED))
1149                 goto err_exit;
1150
1151         list_for_each_entry(func, &slot->funcs, sibling) {
1152                 if (func->bridge) {
1153                         /* cleanup p2p bridges under this P2P bridge */
1154                         cleanup_p2p_bridge(func->bridge->handle,
1155                                                 (u32)1, NULL, NULL);
1156                         func->bridge = NULL;
1157                 }
1158
1159                 pdev = pci_get_slot(slot->bridge->pci_bus,
1160                                     PCI_DEVFN(slot->device, func->function));
1161                 if (pdev) {
1162                         pci_stop_bus_device(pdev);
1163                         if (pdev->subordinate) {
1164                                 disable_bridges(pdev->subordinate);
1165                                 pci_disable_device(pdev);
1166                         }
1167                         pci_remove_bus_device(pdev);
1168                         pci_dev_put(pdev);
1169                 }
1170         }
1171
1172         list_for_each_entry(func, &slot->funcs, sibling) {
1173                 acpiphp_unconfigure_ioapics(func->handle);
1174                 acpiphp_bus_trim(func->handle);
1175         }
1176
1177         slot->flags &= (~SLOT_ENABLED);
1178
1179 err_exit:
1180         return 0;
1181 }
1182
1183
1184 /**
1185  * get_slot_status - get ACPI slot status
1186  * @slot: ACPI PHP slot
1187  *
1188  * If a slot has _STA for each function and if any one of them
1189  * returned non-zero status, return it.
1190  *
1191  * If a slot doesn't have _STA and if any one of its functions'
1192  * configuration space is configured, return 0x0f as a _STA.
1193  *
1194  * Otherwise return 0.
1195  */
1196 static unsigned int get_slot_status(struct acpiphp_slot *slot)
1197 {
1198         acpi_status status;
1199         unsigned long long sta = 0;
1200         u32 dvid;
1201         struct list_head *l;
1202         struct acpiphp_func *func;
1203
1204         list_for_each (l, &slot->funcs) {
1205                 func = list_entry(l, struct acpiphp_func, sibling);
1206
1207                 if (func->flags & FUNC_HAS_STA) {
1208                         status = acpi_evaluate_integer(func->handle, "_STA", NULL, &sta);
1209                         if (ACPI_SUCCESS(status) && sta)
1210                                 break;
1211                 } else {
1212                         pci_bus_read_config_dword(slot->bridge->pci_bus,
1213                                                   PCI_DEVFN(slot->device,
1214                                                             func->function),
1215                                                   PCI_VENDOR_ID, &dvid);
1216                         if (dvid != 0xffffffff) {
1217                                 sta = ACPI_STA_ALL;
1218                                 break;
1219                         }
1220                 }
1221         }
1222
1223         return (unsigned int)sta;
1224 }
1225
1226 /**
1227  * acpiphp_eject_slot - physically eject the slot
1228  * @slot: ACPI PHP slot
1229  */
1230 int acpiphp_eject_slot(struct acpiphp_slot *slot)
1231 {
1232         acpi_status status;
1233         struct acpiphp_func *func;
1234         struct list_head *l;
1235         struct acpi_object_list arg_list;
1236         union acpi_object arg;
1237
1238         list_for_each (l, &slot->funcs) {
1239                 func = list_entry(l, struct acpiphp_func, sibling);
1240
1241                 /* We don't want to call _EJ0 on non-existing functions. */
1242                 if ((func->flags & FUNC_HAS_EJ0)) {
1243                         /* _EJ0 method take one argument */
1244                         arg_list.count = 1;
1245                         arg_list.pointer = &arg;
1246                         arg.type = ACPI_TYPE_INTEGER;
1247                         arg.integer.value = 1;
1248
1249                         status = acpi_evaluate_object(func->handle, "_EJ0", &arg_list, NULL);
1250                         if (ACPI_FAILURE(status)) {
1251                                 warn("%s: _EJ0 failed\n", __func__);
1252                                 return -1;
1253                         } else
1254                                 break;
1255                 }
1256         }
1257         return 0;
1258 }
1259
1260 /**
1261  * acpiphp_check_bridge - re-enumerate devices
1262  * @bridge: where to begin re-enumeration
1263  *
1264  * Iterate over all slots under this bridge and make sure that if a
1265  * card is present they are enabled, and if not they are disabled.
1266  */
1267 static int acpiphp_check_bridge(struct acpiphp_bridge *bridge)
1268 {
1269         struct acpiphp_slot *slot;
1270         int retval = 0;
1271         int enabled, disabled;
1272
1273         enabled = disabled = 0;
1274
1275         for (slot = bridge->slots; slot; slot = slot->next) {
1276                 unsigned int status = get_slot_status(slot);
1277                 if (slot->flags & SLOT_ENABLED) {
1278                         if (status == ACPI_STA_ALL)
1279                                 continue;
1280                         retval = acpiphp_disable_slot(slot);
1281                         if (retval) {
1282                                 err("Error occurred in disabling\n");
1283                                 goto err_exit;
1284                         } else {
1285                                 acpiphp_eject_slot(slot);
1286                         }
1287                         disabled++;
1288                 } else {
1289                         if (status != ACPI_STA_ALL)
1290                                 continue;
1291                         retval = acpiphp_enable_slot(slot);
1292                         if (retval) {
1293                                 err("Error occurred in enabling\n");
1294                                 goto err_exit;
1295                         }
1296                         enabled++;
1297                 }
1298         }
1299
1300         dbg("%s: %d enabled, %d disabled\n", __func__, enabled, disabled);
1301
1302  err_exit:
1303         return retval;
1304 }
1305
1306 static void program_hpp(struct pci_dev *dev, struct acpiphp_bridge *bridge)
1307 {
1308         u16 pci_cmd, pci_bctl;
1309         struct pci_dev *cdev;
1310
1311         /* Program hpp values for this device */
1312         if (!(dev->hdr_type == PCI_HEADER_TYPE_NORMAL ||
1313                         (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE &&
1314                         (dev->class >> 8) == PCI_CLASS_BRIDGE_PCI)))
1315                 return;
1316
1317         if ((dev->class >> 8) == PCI_CLASS_BRIDGE_HOST)
1318                 return;
1319
1320         pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE,
1321                         bridge->hpp.t0->cache_line_size);
1322         pci_write_config_byte(dev, PCI_LATENCY_TIMER,
1323                         bridge->hpp.t0->latency_timer);
1324         pci_read_config_word(dev, PCI_COMMAND, &pci_cmd);
1325         if (bridge->hpp.t0->enable_serr)
1326                 pci_cmd |= PCI_COMMAND_SERR;
1327         else
1328                 pci_cmd &= ~PCI_COMMAND_SERR;
1329         if (bridge->hpp.t0->enable_perr)
1330                 pci_cmd |= PCI_COMMAND_PARITY;
1331         else
1332                 pci_cmd &= ~PCI_COMMAND_PARITY;
1333         pci_write_config_word(dev, PCI_COMMAND, pci_cmd);
1334
1335         /* Program bridge control value and child devices */
1336         if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
1337                 pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER,
1338                                 bridge->hpp.t0->latency_timer);
1339                 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &pci_bctl);
1340                 if (bridge->hpp.t0->enable_serr)
1341                         pci_bctl |= PCI_BRIDGE_CTL_SERR;
1342                 else
1343                         pci_bctl &= ~PCI_BRIDGE_CTL_SERR;
1344                 if (bridge->hpp.t0->enable_perr)
1345                         pci_bctl |= PCI_BRIDGE_CTL_PARITY;
1346                 else
1347                         pci_bctl &= ~PCI_BRIDGE_CTL_PARITY;
1348                 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, pci_bctl);
1349                 if (dev->subordinate) {
1350                         list_for_each_entry(cdev, &dev->subordinate->devices,
1351                                         bus_list)
1352                                 program_hpp(cdev, bridge);
1353                 }
1354         }
1355 }
1356
1357 static void acpiphp_set_hpp_values(acpi_handle handle, struct pci_bus *bus)
1358 {
1359         struct acpiphp_bridge bridge;
1360         struct pci_dev *dev;
1361
1362         memset(&bridge, 0, sizeof(bridge));
1363         bridge.handle = handle;
1364         bridge.pci_bus = bus;
1365         bridge.pci_dev = bus->self;
1366         decode_hpp(&bridge);
1367         list_for_each_entry(dev, &bus->devices, bus_list)
1368                 program_hpp(dev, &bridge);
1369
1370 }
1371
1372 /*
1373  * Remove devices for which we could not assign resources, call
1374  * arch specific code to fix-up the bus
1375  */
1376 static void acpiphp_sanitize_bus(struct pci_bus *bus)
1377 {
1378         struct pci_dev *dev;
1379         int i;
1380         unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM;
1381
1382         list_for_each_entry(dev, &bus->devices, bus_list) {
1383                 for (i=0; i<PCI_BRIDGE_RESOURCES; i++) {
1384                         struct resource *res = &dev->resource[i];
1385                         if ((res->flags & type_mask) && !res->start &&
1386                                         res->end) {
1387                                 /* Could not assign a required resources
1388                                  * for this device, remove it */
1389                                 pci_remove_bus_device(dev);
1390                                 break;
1391                         }
1392                 }
1393         }
1394 }
1395
1396 /* Program resources in newly inserted bridge */
1397 static int acpiphp_configure_bridge (acpi_handle handle)
1398 {
1399         struct acpi_pci_id pci_id;
1400         struct pci_bus *bus;
1401
1402         if (ACPI_FAILURE(acpi_get_pci_id(handle, &pci_id))) {
1403                 err("cannot get PCI domain and bus number for bridge\n");
1404                 return -EINVAL;
1405         }
1406         bus = pci_find_bus(pci_id.segment, pci_id.bus);
1407         if (!bus) {
1408                 err("cannot find bus %d:%d\n",
1409                                 pci_id.segment, pci_id.bus);
1410                 return -EINVAL;
1411         }
1412
1413         pci_bus_size_bridges(bus);
1414         pci_bus_assign_resources(bus);
1415         acpiphp_sanitize_bus(bus);
1416         acpiphp_set_hpp_values(handle, bus);
1417         pci_enable_bridges(bus);
1418         acpiphp_configure_ioapics(handle);
1419         return 0;
1420 }
1421
1422 static void handle_bridge_insertion(acpi_handle handle, u32 type)
1423 {
1424         struct acpi_device *device, *pdevice;
1425         acpi_handle phandle;
1426
1427         if ((type != ACPI_NOTIFY_BUS_CHECK) &&
1428                         (type != ACPI_NOTIFY_DEVICE_CHECK)) {
1429                 err("unexpected notification type %d\n", type);
1430                 return;
1431         }
1432
1433         acpi_get_parent(handle, &phandle);
1434         if (acpi_bus_get_device(phandle, &pdevice)) {
1435                 dbg("no parent device, assuming NULL\n");
1436                 pdevice = NULL;
1437         }
1438         if (acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE)) {
1439                 err("cannot add bridge to acpi list\n");
1440                 return;
1441         }
1442         if (!acpiphp_configure_bridge(handle) &&
1443                 !acpi_bus_start(device))
1444                 add_bridge(handle);
1445         else
1446                 err("cannot configure and start bridge\n");
1447
1448 }
1449
1450 /*
1451  * ACPI event handlers
1452  */
1453
1454 static acpi_status
1455 count_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1456 {
1457         int *count = (int *)context;
1458         struct acpiphp_bridge *bridge;
1459
1460         bridge = acpiphp_handle_to_bridge(handle);
1461         if (bridge)
1462                 (*count)++;
1463         return AE_OK ;
1464 }
1465
1466 static acpi_status
1467 check_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1468 {
1469         struct acpiphp_bridge *bridge;
1470         char objname[64];
1471         struct acpi_buffer buffer = { .length = sizeof(objname),
1472                                       .pointer = objname };
1473
1474         bridge = acpiphp_handle_to_bridge(handle);
1475         if (bridge) {
1476                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1477                 dbg("%s: re-enumerating slots under %s\n",
1478                         __func__, objname);
1479                 acpiphp_check_bridge(bridge);
1480         }
1481         return AE_OK ;
1482 }
1483
1484 /**
1485  * handle_hotplug_event_bridge - handle ACPI event on bridges
1486  * @handle: Notify()'ed acpi_handle
1487  * @type: Notify code
1488  * @context: pointer to acpiphp_bridge structure
1489  *
1490  * Handles ACPI event notification on {host,p2p} bridges.
1491  */
1492 static void handle_hotplug_event_bridge(acpi_handle handle, u32 type, void *context)
1493 {
1494         struct acpiphp_bridge *bridge;
1495         char objname[64];
1496         struct acpi_buffer buffer = { .length = sizeof(objname),
1497                                       .pointer = objname };
1498         struct acpi_device *device;
1499         int num_sub_bridges = 0;
1500
1501         if (acpi_bus_get_device(handle, &device)) {
1502                 /* This bridge must have just been physically inserted */
1503                 handle_bridge_insertion(handle, type);
1504                 return;
1505         }
1506
1507         bridge = acpiphp_handle_to_bridge(handle);
1508         if (type == ACPI_NOTIFY_BUS_CHECK) {
1509                 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, ACPI_UINT32_MAX,
1510                         count_sub_bridges, &num_sub_bridges, NULL);
1511         }
1512
1513         if (!bridge && !num_sub_bridges) {
1514                 err("cannot get bridge info\n");
1515                 return;
1516         }
1517
1518         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1519
1520         switch (type) {
1521         case ACPI_NOTIFY_BUS_CHECK:
1522                 /* bus re-enumerate */
1523                 dbg("%s: Bus check notify on %s\n", __func__, objname);
1524                 if (bridge) {
1525                         dbg("%s: re-enumerating slots under %s\n",
1526                                 __func__, objname);
1527                         acpiphp_check_bridge(bridge);
1528                 }
1529                 if (num_sub_bridges)
1530                         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
1531                                 ACPI_UINT32_MAX, check_sub_bridges, NULL, NULL);
1532                 break;
1533
1534         case ACPI_NOTIFY_DEVICE_CHECK:
1535                 /* device check */
1536                 dbg("%s: Device check notify on %s\n", __func__, objname);
1537                 acpiphp_check_bridge(bridge);
1538                 break;
1539
1540         case ACPI_NOTIFY_DEVICE_WAKE:
1541                 /* wake event */
1542                 dbg("%s: Device wake notify on %s\n", __func__, objname);
1543                 break;
1544
1545         case ACPI_NOTIFY_EJECT_REQUEST:
1546                 /* request device eject */
1547                 dbg("%s: Device eject notify on %s\n", __func__, objname);
1548                 if ((bridge->type != BRIDGE_TYPE_HOST) &&
1549                     (bridge->flags & BRIDGE_HAS_EJ0)) {
1550                         struct acpiphp_slot *slot;
1551                         slot = bridge->func->slot;
1552                         if (!acpiphp_disable_slot(slot))
1553                                 acpiphp_eject_slot(slot);
1554                 }
1555                 break;
1556
1557         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
1558                 printk(KERN_ERR "Device %s cannot be configured due"
1559                                 " to a frequency mismatch\n", objname);
1560                 break;
1561
1562         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
1563                 printk(KERN_ERR "Device %s cannot be configured due"
1564                                 " to a bus mode mismatch\n", objname);
1565                 break;
1566
1567         case ACPI_NOTIFY_POWER_FAULT:
1568                 printk(KERN_ERR "Device %s has suffered a power fault\n",
1569                                 objname);
1570                 break;
1571
1572         default:
1573                 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
1574                 break;
1575         }
1576 }
1577
1578 /**
1579  * handle_hotplug_event_func - handle ACPI event on functions (i.e. slots)
1580  * @handle: Notify()'ed acpi_handle
1581  * @type: Notify code
1582  * @context: pointer to acpiphp_func structure
1583  *
1584  * Handles ACPI event notification on slots.
1585  */
1586 static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context)
1587 {
1588         struct acpiphp_func *func;
1589         char objname[64];
1590         struct acpi_buffer buffer = { .length = sizeof(objname),
1591                                       .pointer = objname };
1592
1593         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1594
1595         func = (struct acpiphp_func *)context;
1596
1597         switch (type) {
1598         case ACPI_NOTIFY_BUS_CHECK:
1599                 /* bus re-enumerate */
1600                 dbg("%s: Bus check notify on %s\n", __func__, objname);
1601                 acpiphp_enable_slot(func->slot);
1602                 break;
1603
1604         case ACPI_NOTIFY_DEVICE_CHECK:
1605                 /* device check : re-enumerate from parent bus */
1606                 dbg("%s: Device check notify on %s\n", __func__, objname);
1607                 acpiphp_check_bridge(func->slot->bridge);
1608                 break;
1609
1610         case ACPI_NOTIFY_DEVICE_WAKE:
1611                 /* wake event */
1612                 dbg("%s: Device wake notify on %s\n", __func__, objname);
1613                 break;
1614
1615         case ACPI_NOTIFY_EJECT_REQUEST:
1616                 /* request device eject */
1617                 dbg("%s: Device eject notify on %s\n", __func__, objname);
1618                 if (!(acpiphp_disable_slot(func->slot)))
1619                         acpiphp_eject_slot(func->slot);
1620                 break;
1621
1622         default:
1623                 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
1624                 break;
1625         }
1626 }
1627
1628
1629 static acpi_status
1630 find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1631 {
1632         int *count = (int *)context;
1633
1634         if (acpi_root_bridge(handle)) {
1635                 acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
1636                                 handle_hotplug_event_bridge, NULL);
1637                         (*count)++;
1638         }
1639         return AE_OK ;
1640 }
1641
1642 static struct acpi_pci_driver acpi_pci_hp_driver = {
1643         .add =          add_bridge,
1644         .remove =       remove_bridge,
1645 };
1646
1647 /**
1648  * acpiphp_glue_init - initializes all PCI hotplug - ACPI glue data structures
1649  */
1650 int __init acpiphp_glue_init(void)
1651 {
1652         int num = 0;
1653
1654         acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
1655                         ACPI_UINT32_MAX, find_root_bridges, &num, NULL);
1656
1657         if (num <= 0)
1658                 return -1;
1659         else
1660                 acpi_pci_register_driver(&acpi_pci_hp_driver);
1661
1662         return 0;
1663 }
1664
1665
1666 /**
1667  * acpiphp_glue_exit - terminates all PCI hotplug - ACPI glue data structures
1668  *
1669  * This function frees all data allocated in acpiphp_glue_init().
1670  */
1671 void  acpiphp_glue_exit(void)
1672 {
1673         acpi_pci_unregister_driver(&acpi_pci_hp_driver);
1674 }
1675
1676
1677 /**
1678  * acpiphp_get_num_slots - count number of slots in a system
1679  */
1680 int __init acpiphp_get_num_slots(void)
1681 {
1682         struct acpiphp_bridge *bridge;
1683         int num_slots = 0;
1684
1685         list_for_each_entry (bridge, &bridge_list, list) {
1686                 dbg("Bus %04x:%02x has %d slot%s\n",
1687                                 pci_domain_nr(bridge->pci_bus),
1688                                 bridge->pci_bus->number, bridge->nr_slots,
1689                                 bridge->nr_slots == 1 ? "" : "s");
1690                 num_slots += bridge->nr_slots;
1691         }
1692
1693         dbg("Total %d slots\n", num_slots);
1694         return num_slots;
1695 }
1696
1697
1698 #if 0
1699 /**
1700  * acpiphp_for_each_slot - call function for each slot
1701  * @fn: callback function
1702  * @data: context to be passed to callback function
1703  */
1704 static int acpiphp_for_each_slot(acpiphp_callback fn, void *data)
1705 {
1706         struct list_head *node;
1707         struct acpiphp_bridge *bridge;
1708         struct acpiphp_slot *slot;
1709         int retval = 0;
1710
1711         list_for_each (node, &bridge_list) {
1712                 bridge = (struct acpiphp_bridge *)node;
1713                 for (slot = bridge->slots; slot; slot = slot->next) {
1714                         retval = fn(slot, data);
1715                         if (!retval)
1716                                 goto err_exit;
1717                 }
1718         }
1719
1720  err_exit:
1721         return retval;
1722 }
1723 #endif
1724
1725
1726 /**
1727  * acpiphp_enable_slot - power on slot
1728  * @slot: ACPI PHP slot
1729  */
1730 int acpiphp_enable_slot(struct acpiphp_slot *slot)
1731 {
1732         int retval;
1733
1734         mutex_lock(&slot->crit_sect);
1735
1736         /* wake up all functions */
1737         retval = power_on_slot(slot);
1738         if (retval)
1739                 goto err_exit;
1740
1741         if (get_slot_status(slot) == ACPI_STA_ALL) {
1742                 /* configure all functions */
1743                 retval = enable_device(slot);
1744                 if (retval)
1745                         power_off_slot(slot);
1746         } else {
1747                 dbg("%s: Slot status is not ACPI_STA_ALL\n", __func__);
1748                 power_off_slot(slot);
1749         }
1750
1751  err_exit:
1752         mutex_unlock(&slot->crit_sect);
1753         return retval;
1754 }
1755
1756 /**
1757  * acpiphp_disable_slot - power off slot
1758  * @slot: ACPI PHP slot
1759  */
1760 int acpiphp_disable_slot(struct acpiphp_slot *slot)
1761 {
1762         int retval = 0;
1763
1764         mutex_lock(&slot->crit_sect);
1765
1766         /* unconfigure all functions */
1767         retval = disable_device(slot);
1768         if (retval)
1769                 goto err_exit;
1770
1771         /* power off all functions */
1772         retval = power_off_slot(slot);
1773         if (retval)
1774                 goto err_exit;
1775
1776  err_exit:
1777         mutex_unlock(&slot->crit_sect);
1778         return retval;
1779 }
1780
1781
1782 /*
1783  * slot enabled:  1
1784  * slot disabled: 0
1785  */
1786 u8 acpiphp_get_power_status(struct acpiphp_slot *slot)
1787 {
1788         return (slot->flags & SLOT_POWEREDON);
1789 }
1790
1791
1792 /*
1793  * latch   open:  1
1794  * latch closed:  0
1795  */
1796 u8 acpiphp_get_latch_status(struct acpiphp_slot *slot)
1797 {
1798         unsigned int sta;
1799
1800         sta = get_slot_status(slot);
1801
1802         return (sta & ACPI_STA_SHOW_IN_UI) ? 0 : 1;
1803 }
1804
1805
1806 /*
1807  * adapter presence : 1
1808  *          absence : 0
1809  */
1810 u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot)
1811 {
1812         unsigned int sta;
1813
1814         sta = get_slot_status(slot);
1815
1816         return (sta == 0) ? 0 : 1;
1817 }