Merge branches 'perf-urgent-for-linus' and 'sched-urgent-for-linus' of git://git...
[pandora-kernel.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 #include <linux/slab.h>
51 #include <linux/acpi.h>
52
53 #include "../pci.h"
54 #include "acpiphp.h"
55
56 static LIST_HEAD(bridge_list);
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(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 const 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         pdev = pbus->self;
136         if (pdev && pci_is_pcie(pdev)) {
137                 tmp = acpi_find_root_bridge_handle(pdev);
138                 if (tmp) {
139                         struct acpi_pci_root *root = acpi_pci_find_root(tmp);
140
141                         if (root && (root->osc_control_set &
142                                         OSC_PCI_EXPRESS_NATIVE_HP_CONTROL))
143                                 return AE_OK;
144                 }
145         }
146
147         acpi_evaluate_integer(handle, "_ADR", NULL, &adr);
148         device = (adr >> 16) & 0xffff;
149         function = adr & 0xffff;
150
151         newfunc = kzalloc(sizeof(struct acpiphp_func), GFP_KERNEL);
152         if (!newfunc)
153                 return AE_NO_MEMORY;
154
155         INIT_LIST_HEAD(&newfunc->sibling);
156         newfunc->handle = handle;
157         newfunc->function = function;
158
159         if (ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp)))
160                 newfunc->flags = FUNC_HAS_EJ0;
161
162         if (ACPI_SUCCESS(acpi_get_handle(handle, "_STA", &tmp)))
163                 newfunc->flags |= FUNC_HAS_STA;
164
165         if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS0", &tmp)))
166                 newfunc->flags |= FUNC_HAS_PS0;
167
168         if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS3", &tmp)))
169                 newfunc->flags |= FUNC_HAS_PS3;
170
171         if (ACPI_SUCCESS(acpi_get_handle(handle, "_DCK", &tmp)))
172                 newfunc->flags |= FUNC_HAS_DCK;
173
174         status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun);
175         if (ACPI_FAILURE(status)) {
176                 /*
177                  * use the count of the number of slots we've found
178                  * for the number of the slot
179                  */
180                 sun = bridge->nr_slots+1;
181         }
182
183         /* search for objects that share the same slot */
184         for (slot = bridge->slots; slot; slot = slot->next)
185                 if (slot->device == device) {
186                         if (slot->sun != sun)
187                                 warn("sibling found, but _SUN doesn't match!\n");
188                         break;
189                 }
190
191         if (!slot) {
192                 slot = kzalloc(sizeof(struct acpiphp_slot), GFP_KERNEL);
193                 if (!slot) {
194                         kfree(newfunc);
195                         return AE_NO_MEMORY;
196                 }
197
198                 slot->bridge = bridge;
199                 slot->device = device;
200                 slot->sun = sun;
201                 INIT_LIST_HEAD(&slot->funcs);
202                 mutex_init(&slot->crit_sect);
203
204                 slot->next = bridge->slots;
205                 bridge->slots = slot;
206
207                 bridge->nr_slots++;
208
209                 dbg("found ACPI PCI Hotplug slot %llu at PCI %04x:%02x:%02x\n",
210                     slot->sun, pci_domain_nr(pbus), pbus->number, device);
211                 retval = acpiphp_register_hotplug_slot(slot);
212                 if (retval) {
213                         if (retval == -EBUSY)
214                                 warn("Slot %llu already registered by another "
215                                         "hotplug driver\n", slot->sun);
216                         else
217                                 warn("acpiphp_register_hotplug_slot failed "
218                                         "(err code = 0x%x)\n", retval);
219                         goto err_exit;
220                 }
221         }
222
223         newfunc->slot = slot;
224         list_add_tail(&newfunc->sibling, &slot->funcs);
225
226         pdev = pci_get_slot(pbus, PCI_DEVFN(device, function));
227         if (pdev) {
228                 slot->flags |= (SLOT_ENABLED | SLOT_POWEREDON);
229                 pci_dev_put(pdev);
230         }
231
232         if (is_dock_device(handle)) {
233                 /* we don't want to call this device's _EJ0
234                  * because we want the dock notify handler
235                  * to call it after it calls _DCK
236                  */
237                 newfunc->flags &= ~FUNC_HAS_EJ0;
238                 if (register_hotplug_dock_device(handle,
239                         &acpiphp_dock_ops, newfunc))
240                         dbg("failed to register dock device\n");
241
242                 /* we need to be notified when dock events happen
243                  * outside of the hotplug operation, since we may
244                  * need to do fixups before we can hotplug.
245                  */
246                 newfunc->nb.notifier_call = post_dock_fixups;
247                 if (register_dock_notifier(&newfunc->nb))
248                         dbg("failed to register a dock notifier");
249         }
250
251         /* install notify handler */
252         if (!(newfunc->flags & FUNC_HAS_DCK)) {
253                 status = acpi_install_notify_handler(handle,
254                                              ACPI_SYSTEM_NOTIFY,
255                                              handle_hotplug_event_func,
256                                              newfunc);
257
258                 if (ACPI_FAILURE(status))
259                         err("failed to register interrupt notify handler\n");
260         } else
261                 status = AE_OK;
262
263         return status;
264
265  err_exit:
266         bridge->nr_slots--;
267         bridge->slots = slot->next;
268         kfree(slot);
269         kfree(newfunc);
270
271         return AE_OK;
272 }
273
274
275 /* see if it's worth looking at this bridge */
276 static int detect_ejectable_slots(acpi_handle handle)
277 {
278         int found = acpi_pci_detect_ejectable(handle);
279         if (!found) {
280                 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
281                                     is_pci_dock_device, NULL, (void *)&found, NULL);
282         }
283         return found;
284 }
285
286 /* initialize miscellaneous stuff for both root and PCI-to-PCI bridge */
287 static void init_bridge_misc(struct acpiphp_bridge *bridge)
288 {
289         acpi_status status;
290
291         /* must be added to the list prior to calling register_slot */
292         list_add(&bridge->list, &bridge_list);
293
294         /* register all slot objects under this bridge */
295         status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge->handle, (u32)1,
296                                      register_slot, NULL, bridge, NULL);
297         if (ACPI_FAILURE(status)) {
298                 list_del(&bridge->list);
299                 return;
300         }
301
302         /* install notify handler */
303         if (bridge->type != BRIDGE_TYPE_HOST) {
304                 if ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func) {
305                         status = acpi_remove_notify_handler(bridge->func->handle,
306                                                 ACPI_SYSTEM_NOTIFY,
307                                                 handle_hotplug_event_func);
308                         if (ACPI_FAILURE(status))
309                                 err("failed to remove notify handler\n");
310                 }
311                 status = acpi_install_notify_handler(bridge->handle,
312                                              ACPI_SYSTEM_NOTIFY,
313                                              handle_hotplug_event_bridge,
314                                              bridge);
315
316                 if (ACPI_FAILURE(status)) {
317                         err("failed to register interrupt notify handler\n");
318                 }
319         }
320 }
321
322
323 /* find acpiphp_func from acpiphp_bridge */
324 static struct acpiphp_func *acpiphp_bridge_handle_to_function(acpi_handle handle)
325 {
326         struct acpiphp_bridge *bridge;
327         struct acpiphp_slot *slot;
328         struct acpiphp_func *func;
329
330         list_for_each_entry(bridge, &bridge_list, list) {
331                 for (slot = bridge->slots; slot; slot = slot->next) {
332                         list_for_each_entry(func, &slot->funcs, sibling) {
333                                 if (func->handle == handle)
334                                         return func;
335                         }
336                 }
337         }
338
339         return NULL;
340 }
341
342
343 static inline void config_p2p_bridge_flags(struct acpiphp_bridge *bridge)
344 {
345         acpi_handle dummy_handle;
346
347         if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
348                                         "_STA", &dummy_handle)))
349                 bridge->flags |= BRIDGE_HAS_STA;
350
351         if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
352                                         "_EJ0", &dummy_handle)))
353                 bridge->flags |= BRIDGE_HAS_EJ0;
354
355         if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
356                                         "_PS0", &dummy_handle)))
357                 bridge->flags |= BRIDGE_HAS_PS0;
358
359         if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
360                                         "_PS3", &dummy_handle)))
361                 bridge->flags |= BRIDGE_HAS_PS3;
362
363         /* is this ejectable p2p bridge? */
364         if (bridge->flags & BRIDGE_HAS_EJ0) {
365                 struct acpiphp_func *func;
366
367                 dbg("found ejectable p2p bridge\n");
368
369                 /* make link between PCI bridge and PCI function */
370                 func = acpiphp_bridge_handle_to_function(bridge->handle);
371                 if (!func)
372                         return;
373                 bridge->func = func;
374                 func->bridge = bridge;
375         }
376 }
377
378
379 /* allocate and initialize host bridge data structure */
380 static void add_host_bridge(acpi_handle *handle)
381 {
382         struct acpiphp_bridge *bridge;
383         struct acpi_pci_root *root = acpi_pci_find_root(handle);
384
385         bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
386         if (bridge == NULL)
387                 return;
388
389         bridge->type = BRIDGE_TYPE_HOST;
390         bridge->handle = handle;
391
392         bridge->pci_bus = root->bus;
393
394         spin_lock_init(&bridge->res_lock);
395
396         init_bridge_misc(bridge);
397 }
398
399
400 /* allocate and initialize PCI-to-PCI bridge data structure */
401 static void add_p2p_bridge(acpi_handle *handle)
402 {
403         struct acpiphp_bridge *bridge;
404
405         bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
406         if (bridge == NULL) {
407                 err("out of memory\n");
408                 return;
409         }
410
411         bridge->type = BRIDGE_TYPE_P2P;
412         bridge->handle = handle;
413         config_p2p_bridge_flags(bridge);
414
415         bridge->pci_dev = acpi_get_pci_dev(handle);
416         bridge->pci_bus = bridge->pci_dev->subordinate;
417         if (!bridge->pci_bus) {
418                 err("This is not a PCI-to-PCI bridge!\n");
419                 goto err;
420         }
421
422         /*
423          * Grab a ref to the subordinate PCI bus in case the bus is
424          * removed via PCI core logical hotplug. The ref pins the bus
425          * (which we access during module unload).
426          */
427         get_device(&bridge->pci_bus->dev);
428         spin_lock_init(&bridge->res_lock);
429
430         init_bridge_misc(bridge);
431         return;
432  err:
433         pci_dev_put(bridge->pci_dev);
434         kfree(bridge);
435         return;
436 }
437
438
439 /* callback routine to find P2P bridges */
440 static acpi_status
441 find_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
442 {
443         acpi_status status;
444         struct pci_dev *dev;
445
446         dev = acpi_get_pci_dev(handle);
447         if (!dev || !dev->subordinate)
448                 goto out;
449
450         /* check if this bridge has ejectable slots */
451         if ((detect_ejectable_slots(handle) > 0)) {
452                 dbg("found PCI-to-PCI bridge at PCI %s\n", pci_name(dev));
453                 add_p2p_bridge(handle);
454         }
455
456         /* search P2P bridges under this p2p bridge */
457         status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
458                                      find_p2p_bridge, NULL, NULL, NULL);
459         if (ACPI_FAILURE(status))
460                 warn("find_p2p_bridge failed (error code = 0x%x)\n", status);
461
462  out:
463         pci_dev_put(dev);
464         return AE_OK;
465 }
466
467
468 /* find hot-pluggable slots, and then find P2P bridge */
469 static int add_bridge(acpi_handle handle)
470 {
471         acpi_status status;
472         unsigned long long tmp;
473         acpi_handle dummy_handle;
474
475         /* if the bridge doesn't have _STA, we assume it is always there */
476         status = acpi_get_handle(handle, "_STA", &dummy_handle);
477         if (ACPI_SUCCESS(status)) {
478                 status = acpi_evaluate_integer(handle, "_STA", NULL, &tmp);
479                 if (ACPI_FAILURE(status)) {
480                         dbg("%s: _STA evaluation failure\n", __func__);
481                         return 0;
482                 }
483                 if ((tmp & ACPI_STA_FUNCTIONING) == 0)
484                         /* don't register this object */
485                         return 0;
486         }
487
488         /* check if this bridge has ejectable slots */
489         if (detect_ejectable_slots(handle) > 0) {
490                 dbg("found PCI host-bus bridge with hot-pluggable slots\n");
491                 add_host_bridge(handle);
492         }
493
494         /* search P2P bridges under this host bridge */
495         status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
496                                      find_p2p_bridge, NULL, NULL, NULL);
497
498         if (ACPI_FAILURE(status))
499                 warn("find_p2p_bridge failed (error code = 0x%x)\n", status);
500
501         return 0;
502 }
503
504 static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle)
505 {
506         struct acpiphp_bridge *bridge;
507
508         list_for_each_entry(bridge, &bridge_list, list)
509                 if (bridge->handle == handle)
510                         return bridge;
511
512         return NULL;
513 }
514
515 static void cleanup_bridge(struct acpiphp_bridge *bridge)
516 {
517         struct acpiphp_slot *slot, *next;
518         struct acpiphp_func *func, *tmp;
519         acpi_status status;
520         acpi_handle handle = bridge->handle;
521
522         status = acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
523                                             handle_hotplug_event_bridge);
524         if (ACPI_FAILURE(status))
525                 err("failed to remove notify handler\n");
526
527         if ((bridge->type != BRIDGE_TYPE_HOST) &&
528             ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func)) {
529                 status = acpi_install_notify_handler(bridge->func->handle,
530                                                 ACPI_SYSTEM_NOTIFY,
531                                                 handle_hotplug_event_func,
532                                                 bridge->func);
533                 if (ACPI_FAILURE(status))
534                         err("failed to install interrupt notify handler\n");
535         }
536
537         slot = bridge->slots;
538         while (slot) {
539                 next = slot->next;
540                 list_for_each_entry_safe(func, tmp, &slot->funcs, sibling) {
541                         if (is_dock_device(func->handle)) {
542                                 unregister_hotplug_dock_device(func->handle);
543                                 unregister_dock_notifier(&func->nb);
544                         }
545                         if (!(func->flags & FUNC_HAS_DCK)) {
546                                 status = acpi_remove_notify_handler(func->handle,
547                                                 ACPI_SYSTEM_NOTIFY,
548                                                 handle_hotplug_event_func);
549                                 if (ACPI_FAILURE(status))
550                                         err("failed to remove notify handler\n");
551                         }
552                         list_del(&func->sibling);
553                         kfree(func);
554                 }
555                 acpiphp_unregister_hotplug_slot(slot);
556                 list_del(&slot->funcs);
557                 kfree(slot);
558                 slot = next;
559         }
560
561         /*
562          * Only P2P bridges have a pci_dev
563          */
564         if (bridge->pci_dev)
565                 put_device(&bridge->pci_bus->dev);
566
567         pci_dev_put(bridge->pci_dev);
568         list_del(&bridge->list);
569         kfree(bridge);
570 }
571
572 static acpi_status
573 cleanup_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
574 {
575         struct acpiphp_bridge *bridge;
576
577         /* cleanup p2p bridges under this P2P bridge
578            in a depth-first manner */
579         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
580                                 cleanup_p2p_bridge, NULL, NULL, NULL);
581
582         bridge = acpiphp_handle_to_bridge(handle);
583         if (bridge)
584                 cleanup_bridge(bridge);
585
586         return AE_OK;
587 }
588
589 static void remove_bridge(acpi_handle handle)
590 {
591         struct acpiphp_bridge *bridge;
592
593         /* cleanup p2p bridges under this host bridge
594            in a depth-first manner */
595         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
596                                 (u32)1, cleanup_p2p_bridge, NULL, NULL, NULL);
597
598         /*
599          * On root bridges with hotplug slots directly underneath (ie,
600          * no p2p bridge between), we call cleanup_bridge(). 
601          *
602          * The else clause cleans up root bridges that either had no
603          * hotplug slots at all, or had a p2p bridge underneath.
604          */
605         bridge = acpiphp_handle_to_bridge(handle);
606         if (bridge)
607                 cleanup_bridge(bridge);
608         else
609                 acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
610                                            handle_hotplug_event_bridge);
611 }
612
613 static int power_on_slot(struct acpiphp_slot *slot)
614 {
615         acpi_status status;
616         struct acpiphp_func *func;
617         int retval = 0;
618
619         /* if already enabled, just skip */
620         if (slot->flags & SLOT_POWEREDON)
621                 goto err_exit;
622
623         list_for_each_entry(func, &slot->funcs, sibling) {
624                 if (func->flags & FUNC_HAS_PS0) {
625                         dbg("%s: executing _PS0\n", __func__);
626                         status = acpi_evaluate_object(func->handle, "_PS0", NULL, NULL);
627                         if (ACPI_FAILURE(status)) {
628                                 warn("%s: _PS0 failed\n", __func__);
629                                 retval = -1;
630                                 goto err_exit;
631                         } else
632                                 break;
633                 }
634         }
635
636         /* TBD: evaluate _STA to check if the slot is enabled */
637
638         slot->flags |= SLOT_POWEREDON;
639
640  err_exit:
641         return retval;
642 }
643
644
645 static int power_off_slot(struct acpiphp_slot *slot)
646 {
647         acpi_status status;
648         struct acpiphp_func *func;
649
650         int retval = 0;
651
652         /* if already disabled, just skip */
653         if ((slot->flags & SLOT_POWEREDON) == 0)
654                 goto err_exit;
655
656         list_for_each_entry(func, &slot->funcs, sibling) {
657                 if (func->flags & FUNC_HAS_PS3) {
658                         status = acpi_evaluate_object(func->handle, "_PS3", NULL, NULL);
659                         if (ACPI_FAILURE(status)) {
660                                 warn("%s: _PS3 failed\n", __func__);
661                                 retval = -1;
662                                 goto err_exit;
663                         } else
664                                 break;
665                 }
666         }
667
668         /* TBD: evaluate _STA to check if the slot is disabled */
669
670         slot->flags &= (~SLOT_POWEREDON);
671
672  err_exit:
673         return retval;
674 }
675
676
677
678 /**
679  * acpiphp_max_busnr - return the highest reserved bus number under the given bus.
680  * @bus: bus to start search with
681  */
682 static unsigned char acpiphp_max_busnr(struct pci_bus *bus)
683 {
684         struct list_head *tmp;
685         unsigned char max, n;
686
687         /*
688          * pci_bus_max_busnr will return the highest
689          * reserved busnr for all these children.
690          * that is equivalent to the bus->subordinate
691          * value.  We don't want to use the parent's
692          * bus->subordinate value because it could have
693          * padding in it.
694          */
695         max = bus->secondary;
696
697         list_for_each(tmp, &bus->children) {
698                 n = pci_bus_max_busnr(pci_bus_b(tmp));
699                 if (n > max)
700                         max = n;
701         }
702         return max;
703 }
704
705
706 /**
707  * acpiphp_bus_add - add a new bus to acpi subsystem
708  * @func: acpiphp_func of the bridge
709  */
710 static int acpiphp_bus_add(struct acpiphp_func *func)
711 {
712         acpi_handle phandle;
713         struct acpi_device *device, *pdevice;
714         int ret_val;
715
716         acpi_get_parent(func->handle, &phandle);
717         if (acpi_bus_get_device(phandle, &pdevice)) {
718                 dbg("no parent device, assuming NULL\n");
719                 pdevice = NULL;
720         }
721         if (!acpi_bus_get_device(func->handle, &device)) {
722                 dbg("bus exists... trim\n");
723                 /* this shouldn't be in here, so remove
724                  * the bus then re-add it...
725                  */
726                 ret_val = acpi_bus_trim(device, 1);
727                 dbg("acpi_bus_trim return %x\n", ret_val);
728         }
729
730         ret_val = acpi_bus_add(&device, pdevice, func->handle,
731                 ACPI_BUS_TYPE_DEVICE);
732         if (ret_val) {
733                 dbg("error adding bus, %x\n",
734                         -ret_val);
735                 goto acpiphp_bus_add_out;
736         }
737         ret_val = acpi_bus_start(device);
738
739 acpiphp_bus_add_out:
740         return ret_val;
741 }
742
743
744 /**
745  * acpiphp_bus_trim - trim a bus from acpi subsystem
746  * @handle: handle to acpi namespace
747  */
748 static int acpiphp_bus_trim(acpi_handle handle)
749 {
750         struct acpi_device *device;
751         int retval;
752
753         retval = acpi_bus_get_device(handle, &device);
754         if (retval) {
755                 dbg("acpi_device not found\n");
756                 return retval;
757         }
758
759         retval = acpi_bus_trim(device, 1);
760         if (retval)
761                 err("cannot remove from acpi list\n");
762
763         return retval;
764 }
765
766 static void acpiphp_set_acpi_region(struct acpiphp_slot *slot)
767 {
768         struct acpiphp_func *func;
769         union acpi_object params[2];
770         struct acpi_object_list arg_list;
771
772         list_for_each_entry(func, &slot->funcs, sibling) {
773                 arg_list.count = 2;
774                 arg_list.pointer = params;
775                 params[0].type = ACPI_TYPE_INTEGER;
776                 params[0].integer.value = ACPI_ADR_SPACE_PCI_CONFIG;
777                 params[1].type = ACPI_TYPE_INTEGER;
778                 params[1].integer.value = 1;
779                 /* _REG is optional, we don't care about if there is failure */
780                 acpi_evaluate_object(func->handle, "_REG", &arg_list, NULL);
781         }
782 }
783
784 /**
785  * enable_device - enable, configure a slot
786  * @slot: slot to be enabled
787  *
788  * This function should be called per *physical slot*,
789  * not per each slot object in ACPI namespace.
790  */
791 static int __ref enable_device(struct acpiphp_slot *slot)
792 {
793         struct pci_dev *dev;
794         struct pci_bus *bus = slot->bridge->pci_bus;
795         struct acpiphp_func *func;
796         int retval = 0;
797         int num, max, pass;
798         acpi_status status;
799
800         if (slot->flags & SLOT_ENABLED)
801                 goto err_exit;
802
803         /* sanity check: dev should be NULL when hot-plugged in */
804         dev = pci_get_slot(bus, PCI_DEVFN(slot->device, 0));
805         if (dev) {
806                 /* This case shouldn't happen */
807                 err("pci_dev structure already exists.\n");
808                 pci_dev_put(dev);
809                 retval = -1;
810                 goto err_exit;
811         }
812
813         num = pci_scan_slot(bus, PCI_DEVFN(slot->device, 0));
814         if (num == 0) {
815                 err("No new device found\n");
816                 retval = -1;
817                 goto err_exit;
818         }
819
820         max = acpiphp_max_busnr(bus);
821         for (pass = 0; pass < 2; pass++) {
822                 list_for_each_entry(dev, &bus->devices, bus_list) {
823                         if (PCI_SLOT(dev->devfn) != slot->device)
824                                 continue;
825                         if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
826                             dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
827                                 max = pci_scan_bridge(bus, dev, max, pass);
828                                 if (pass && dev->subordinate)
829                                         pci_bus_size_bridges(dev->subordinate);
830                         }
831                 }
832         }
833
834         list_for_each_entry(func, &slot->funcs, sibling)
835                 acpiphp_bus_add(func);
836
837         pci_bus_assign_resources(bus);
838         acpiphp_sanitize_bus(bus);
839         acpiphp_set_hpp_values(bus);
840         acpiphp_set_acpi_region(slot);
841         pci_enable_bridges(bus);
842
843         list_for_each_entry(dev, &bus->devices, bus_list) {
844                 /* Assume that newly added devices are powered on already. */
845                 if (!dev->is_added)
846                         dev->current_state = PCI_D0;
847         }
848
849         pci_bus_add_devices(bus);
850
851         list_for_each_entry(func, &slot->funcs, sibling) {
852                 dev = pci_get_slot(bus, PCI_DEVFN(slot->device,
853                                                   func->function));
854                 if (!dev)
855                         continue;
856
857                 if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE &&
858                     dev->hdr_type != PCI_HEADER_TYPE_CARDBUS) {
859                         pci_dev_put(dev);
860                         continue;
861                 }
862
863                 status = find_p2p_bridge(func->handle, (u32)1, bus, NULL);
864                 if (ACPI_FAILURE(status))
865                         warn("find_p2p_bridge failed (error code = 0x%x)\n",
866                                 status);
867                 pci_dev_put(dev);
868         }
869
870         slot->flags |= SLOT_ENABLED;
871
872  err_exit:
873         return retval;
874 }
875
876 static void disable_bridges(struct pci_bus *bus)
877 {
878         struct pci_dev *dev;
879         list_for_each_entry(dev, &bus->devices, bus_list) {
880                 if (dev->subordinate) {
881                         disable_bridges(dev->subordinate);
882                         pci_disable_device(dev);
883                 }
884         }
885 }
886
887 /**
888  * disable_device - disable a slot
889  * @slot: ACPI PHP slot
890  */
891 static int disable_device(struct acpiphp_slot *slot)
892 {
893         struct acpiphp_func *func;
894         struct pci_dev *pdev;
895
896         /* is this slot already disabled? */
897         if (!(slot->flags & SLOT_ENABLED))
898                 goto err_exit;
899
900         list_for_each_entry(func, &slot->funcs, sibling) {
901                 if (func->bridge) {
902                         /* cleanup p2p bridges under this P2P bridge */
903                         cleanup_p2p_bridge(func->bridge->handle,
904                                                 (u32)1, NULL, NULL);
905                         func->bridge = NULL;
906                 }
907
908                 pdev = pci_get_slot(slot->bridge->pci_bus,
909                                     PCI_DEVFN(slot->device, func->function));
910                 if (pdev) {
911                         pci_stop_bus_device(pdev);
912                         if (pdev->subordinate) {
913                                 disable_bridges(pdev->subordinate);
914                                 pci_disable_device(pdev);
915                         }
916                         pci_remove_bus_device(pdev);
917                         pci_dev_put(pdev);
918                 }
919         }
920
921         list_for_each_entry(func, &slot->funcs, sibling) {
922                 acpiphp_bus_trim(func->handle);
923         }
924
925         slot->flags &= (~SLOT_ENABLED);
926
927 err_exit:
928         return 0;
929 }
930
931
932 /**
933  * get_slot_status - get ACPI slot status
934  * @slot: ACPI PHP slot
935  *
936  * If a slot has _STA for each function and if any one of them
937  * returned non-zero status, return it.
938  *
939  * If a slot doesn't have _STA and if any one of its functions'
940  * configuration space is configured, return 0x0f as a _STA.
941  *
942  * Otherwise return 0.
943  */
944 static unsigned int get_slot_status(struct acpiphp_slot *slot)
945 {
946         acpi_status status;
947         unsigned long long sta = 0;
948         u32 dvid;
949         struct acpiphp_func *func;
950
951         list_for_each_entry(func, &slot->funcs, sibling) {
952                 if (func->flags & FUNC_HAS_STA) {
953                         status = acpi_evaluate_integer(func->handle, "_STA", NULL, &sta);
954                         if (ACPI_SUCCESS(status) && sta)
955                                 break;
956                 } else {
957                         pci_bus_read_config_dword(slot->bridge->pci_bus,
958                                                   PCI_DEVFN(slot->device,
959                                                             func->function),
960                                                   PCI_VENDOR_ID, &dvid);
961                         if (dvid != 0xffffffff) {
962                                 sta = ACPI_STA_ALL;
963                                 break;
964                         }
965                 }
966         }
967
968         return (unsigned int)sta;
969 }
970
971 /**
972  * acpiphp_eject_slot - physically eject the slot
973  * @slot: ACPI PHP slot
974  */
975 int acpiphp_eject_slot(struct acpiphp_slot *slot)
976 {
977         acpi_status status;
978         struct acpiphp_func *func;
979         struct acpi_object_list arg_list;
980         union acpi_object arg;
981
982         list_for_each_entry(func, &slot->funcs, sibling) {
983                 /* We don't want to call _EJ0 on non-existing functions. */
984                 if ((func->flags & FUNC_HAS_EJ0)) {
985                         /* _EJ0 method take one argument */
986                         arg_list.count = 1;
987                         arg_list.pointer = &arg;
988                         arg.type = ACPI_TYPE_INTEGER;
989                         arg.integer.value = 1;
990
991                         status = acpi_evaluate_object(func->handle, "_EJ0", &arg_list, NULL);
992                         if (ACPI_FAILURE(status)) {
993                                 warn("%s: _EJ0 failed\n", __func__);
994                                 return -1;
995                         } else
996                                 break;
997                 }
998         }
999         return 0;
1000 }
1001
1002 /**
1003  * acpiphp_check_bridge - re-enumerate devices
1004  * @bridge: where to begin re-enumeration
1005  *
1006  * Iterate over all slots under this bridge and make sure that if a
1007  * card is present they are enabled, and if not they are disabled.
1008  */
1009 static int acpiphp_check_bridge(struct acpiphp_bridge *bridge)
1010 {
1011         struct acpiphp_slot *slot;
1012         int retval = 0;
1013         int enabled, disabled;
1014
1015         enabled = disabled = 0;
1016
1017         for (slot = bridge->slots; slot; slot = slot->next) {
1018                 unsigned int status = get_slot_status(slot);
1019                 if (slot->flags & SLOT_ENABLED) {
1020                         if (status == ACPI_STA_ALL)
1021                                 continue;
1022                         retval = acpiphp_disable_slot(slot);
1023                         if (retval) {
1024                                 err("Error occurred in disabling\n");
1025                                 goto err_exit;
1026                         } else {
1027                                 acpiphp_eject_slot(slot);
1028                         }
1029                         disabled++;
1030                 } else {
1031                         if (status != ACPI_STA_ALL)
1032                                 continue;
1033                         retval = acpiphp_enable_slot(slot);
1034                         if (retval) {
1035                                 err("Error occurred in enabling\n");
1036                                 goto err_exit;
1037                         }
1038                         enabled++;
1039                 }
1040         }
1041
1042         dbg("%s: %d enabled, %d disabled\n", __func__, enabled, disabled);
1043
1044  err_exit:
1045         return retval;
1046 }
1047
1048 static void acpiphp_set_hpp_values(struct pci_bus *bus)
1049 {
1050         struct pci_dev *dev;
1051
1052         list_for_each_entry(dev, &bus->devices, bus_list)
1053                 pci_configure_slot(dev);
1054 }
1055
1056 /*
1057  * Remove devices for which we could not assign resources, call
1058  * arch specific code to fix-up the bus
1059  */
1060 static void acpiphp_sanitize_bus(struct pci_bus *bus)
1061 {
1062         struct pci_dev *dev;
1063         int i;
1064         unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM;
1065
1066         list_for_each_entry(dev, &bus->devices, bus_list) {
1067                 for (i=0; i<PCI_BRIDGE_RESOURCES; i++) {
1068                         struct resource *res = &dev->resource[i];
1069                         if ((res->flags & type_mask) && !res->start &&
1070                                         res->end) {
1071                                 /* Could not assign a required resources
1072                                  * for this device, remove it */
1073                                 pci_remove_bus_device(dev);
1074                                 break;
1075                         }
1076                 }
1077         }
1078 }
1079
1080 /* Program resources in newly inserted bridge */
1081 static int acpiphp_configure_bridge (acpi_handle handle)
1082 {
1083         struct pci_bus *bus;
1084
1085         if (acpi_is_root_bridge(handle)) {
1086                 struct acpi_pci_root *root = acpi_pci_find_root(handle);
1087                 bus = root->bus;
1088         } else {
1089                 struct pci_dev *pdev = acpi_get_pci_dev(handle);
1090                 bus = pdev->subordinate;
1091                 pci_dev_put(pdev);
1092         }
1093
1094         pci_bus_size_bridges(bus);
1095         pci_bus_assign_resources(bus);
1096         acpiphp_sanitize_bus(bus);
1097         acpiphp_set_hpp_values(bus);
1098         pci_enable_bridges(bus);
1099         return 0;
1100 }
1101
1102 static void handle_bridge_insertion(acpi_handle handle, u32 type)
1103 {
1104         struct acpi_device *device, *pdevice;
1105         acpi_handle phandle;
1106
1107         if ((type != ACPI_NOTIFY_BUS_CHECK) &&
1108                         (type != ACPI_NOTIFY_DEVICE_CHECK)) {
1109                 err("unexpected notification type %d\n", type);
1110                 return;
1111         }
1112
1113         acpi_get_parent(handle, &phandle);
1114         if (acpi_bus_get_device(phandle, &pdevice)) {
1115                 dbg("no parent device, assuming NULL\n");
1116                 pdevice = NULL;
1117         }
1118         if (acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE)) {
1119                 err("cannot add bridge to acpi list\n");
1120                 return;
1121         }
1122         if (!acpiphp_configure_bridge(handle) &&
1123                 !acpi_bus_start(device))
1124                 add_bridge(handle);
1125         else
1126                 err("cannot configure and start bridge\n");
1127
1128 }
1129
1130 /*
1131  * ACPI event handlers
1132  */
1133
1134 static acpi_status
1135 count_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1136 {
1137         int *count = (int *)context;
1138         struct acpiphp_bridge *bridge;
1139
1140         bridge = acpiphp_handle_to_bridge(handle);
1141         if (bridge)
1142                 (*count)++;
1143         return AE_OK ;
1144 }
1145
1146 static acpi_status
1147 check_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1148 {
1149         struct acpiphp_bridge *bridge;
1150         char objname[64];
1151         struct acpi_buffer buffer = { .length = sizeof(objname),
1152                                       .pointer = objname };
1153
1154         bridge = acpiphp_handle_to_bridge(handle);
1155         if (bridge) {
1156                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1157                 dbg("%s: re-enumerating slots under %s\n",
1158                         __func__, objname);
1159                 acpiphp_check_bridge(bridge);
1160         }
1161         return AE_OK ;
1162 }
1163
1164 struct acpiphp_hp_work {
1165         struct work_struct work;
1166         acpi_handle handle;
1167         u32 type;
1168         void *context;
1169 };
1170
1171 static void alloc_acpiphp_hp_work(acpi_handle handle, u32 type,
1172                                   void *context,
1173                                   void (*func)(struct work_struct *work))
1174 {
1175         struct acpiphp_hp_work *hp_work;
1176         int ret;
1177
1178         hp_work = kmalloc(sizeof(*hp_work), GFP_KERNEL);
1179         if (!hp_work)
1180                 return;
1181
1182         hp_work->handle = handle;
1183         hp_work->type = type;
1184         hp_work->context = context;
1185
1186         INIT_WORK(&hp_work->work, func);
1187         ret = queue_work(kacpi_hotplug_wq, &hp_work->work);
1188         if (!ret)
1189                 kfree(hp_work);
1190 }
1191
1192 static void _handle_hotplug_event_bridge(struct work_struct *work)
1193 {
1194         struct acpiphp_bridge *bridge;
1195         char objname[64];
1196         struct acpi_buffer buffer = { .length = sizeof(objname),
1197                                       .pointer = objname };
1198         struct acpi_device *device;
1199         int num_sub_bridges = 0;
1200         struct acpiphp_hp_work *hp_work;
1201         acpi_handle handle;
1202         u32 type;
1203
1204         hp_work = container_of(work, struct acpiphp_hp_work, work);
1205         handle = hp_work->handle;
1206         type = hp_work->type;
1207
1208         if (acpi_bus_get_device(handle, &device)) {
1209                 /* This bridge must have just been physically inserted */
1210                 handle_bridge_insertion(handle, type);
1211                 goto out;
1212         }
1213
1214         bridge = acpiphp_handle_to_bridge(handle);
1215         if (type == ACPI_NOTIFY_BUS_CHECK) {
1216                 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, ACPI_UINT32_MAX,
1217                         count_sub_bridges, NULL, &num_sub_bridges, NULL);
1218         }
1219
1220         if (!bridge && !num_sub_bridges) {
1221                 err("cannot get bridge info\n");
1222                 goto out;
1223         }
1224
1225         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1226
1227         switch (type) {
1228         case ACPI_NOTIFY_BUS_CHECK:
1229                 /* bus re-enumerate */
1230                 dbg("%s: Bus check notify on %s\n", __func__, objname);
1231                 if (bridge) {
1232                         dbg("%s: re-enumerating slots under %s\n",
1233                                 __func__, objname);
1234                         acpiphp_check_bridge(bridge);
1235                 }
1236                 if (num_sub_bridges)
1237                         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
1238                                 ACPI_UINT32_MAX, check_sub_bridges, NULL, NULL, NULL);
1239                 break;
1240
1241         case ACPI_NOTIFY_DEVICE_CHECK:
1242                 /* device check */
1243                 dbg("%s: Device check notify on %s\n", __func__, objname);
1244                 acpiphp_check_bridge(bridge);
1245                 break;
1246
1247         case ACPI_NOTIFY_DEVICE_WAKE:
1248                 /* wake event */
1249                 dbg("%s: Device wake notify on %s\n", __func__, objname);
1250                 break;
1251
1252         case ACPI_NOTIFY_EJECT_REQUEST:
1253                 /* request device eject */
1254                 dbg("%s: Device eject notify on %s\n", __func__, objname);
1255                 if ((bridge->type != BRIDGE_TYPE_HOST) &&
1256                     (bridge->flags & BRIDGE_HAS_EJ0)) {
1257                         struct acpiphp_slot *slot;
1258                         slot = bridge->func->slot;
1259                         if (!acpiphp_disable_slot(slot))
1260                                 acpiphp_eject_slot(slot);
1261                 }
1262                 break;
1263
1264         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
1265                 printk(KERN_ERR "Device %s cannot be configured due"
1266                                 " to a frequency mismatch\n", objname);
1267                 break;
1268
1269         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
1270                 printk(KERN_ERR "Device %s cannot be configured due"
1271                                 " to a bus mode mismatch\n", objname);
1272                 break;
1273
1274         case ACPI_NOTIFY_POWER_FAULT:
1275                 printk(KERN_ERR "Device %s has suffered a power fault\n",
1276                                 objname);
1277                 break;
1278
1279         default:
1280                 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
1281                 break;
1282         }
1283
1284 out:
1285         kfree(hp_work); /* allocated in handle_hotplug_event_bridge */
1286 }
1287
1288 /**
1289  * handle_hotplug_event_bridge - handle ACPI event on bridges
1290  * @handle: Notify()'ed acpi_handle
1291  * @type: Notify code
1292  * @context: pointer to acpiphp_bridge structure
1293  *
1294  * Handles ACPI event notification on {host,p2p} bridges.
1295  */
1296 static void handle_hotplug_event_bridge(acpi_handle handle, u32 type,
1297                                         void *context)
1298 {
1299         /*
1300          * Currently the code adds all hotplug events to the kacpid_wq
1301          * queue when it should add hotplug events to the kacpi_hotplug_wq.
1302          * The proper way to fix this is to reorganize the code so that
1303          * drivers (dock, etc.) do not call acpi_os_execute(), etc.
1304          * For now just re-add this work to the kacpi_hotplug_wq so we
1305          * don't deadlock on hotplug actions.
1306          */
1307         alloc_acpiphp_hp_work(handle, type, context,
1308                               _handle_hotplug_event_bridge);
1309 }
1310
1311 static void _handle_hotplug_event_func(struct work_struct *work)
1312 {
1313         struct acpiphp_func *func;
1314         char objname[64];
1315         struct acpi_buffer buffer = { .length = sizeof(objname),
1316                                       .pointer = objname };
1317         struct acpiphp_hp_work *hp_work;
1318         acpi_handle handle;
1319         u32 type;
1320         void *context;
1321
1322         hp_work = container_of(work, struct acpiphp_hp_work, work);
1323         handle = hp_work->handle;
1324         type = hp_work->type;
1325         context = hp_work->context;
1326
1327         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1328
1329         func = (struct acpiphp_func *)context;
1330
1331         switch (type) {
1332         case ACPI_NOTIFY_BUS_CHECK:
1333                 /* bus re-enumerate */
1334                 dbg("%s: Bus check notify on %s\n", __func__, objname);
1335                 acpiphp_enable_slot(func->slot);
1336                 break;
1337
1338         case ACPI_NOTIFY_DEVICE_CHECK:
1339                 /* device check : re-enumerate from parent bus */
1340                 dbg("%s: Device check notify on %s\n", __func__, objname);
1341                 acpiphp_check_bridge(func->slot->bridge);
1342                 break;
1343
1344         case ACPI_NOTIFY_DEVICE_WAKE:
1345                 /* wake event */
1346                 dbg("%s: Device wake notify on %s\n", __func__, objname);
1347                 break;
1348
1349         case ACPI_NOTIFY_EJECT_REQUEST:
1350                 /* request device eject */
1351                 dbg("%s: Device eject notify on %s\n", __func__, objname);
1352                 if (!(acpiphp_disable_slot(func->slot)))
1353                         acpiphp_eject_slot(func->slot);
1354                 break;
1355
1356         default:
1357                 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
1358                 break;
1359         }
1360
1361         kfree(hp_work); /* allocated in handle_hotplug_event_func */
1362 }
1363
1364 /**
1365  * handle_hotplug_event_func - handle ACPI event on functions (i.e. slots)
1366  * @handle: Notify()'ed acpi_handle
1367  * @type: Notify code
1368  * @context: pointer to acpiphp_func structure
1369  *
1370  * Handles ACPI event notification on slots.
1371  */
1372 static void handle_hotplug_event_func(acpi_handle handle, u32 type,
1373                                       void *context)
1374 {
1375         /*
1376          * Currently the code adds all hotplug events to the kacpid_wq
1377          * queue when it should add hotplug events to the kacpi_hotplug_wq.
1378          * The proper way to fix this is to reorganize the code so that
1379          * drivers (dock, etc.) do not call acpi_os_execute(), etc.
1380          * For now just re-add this work to the kacpi_hotplug_wq so we
1381          * don't deadlock on hotplug actions.
1382          */
1383         alloc_acpiphp_hp_work(handle, type, context,
1384                               _handle_hotplug_event_func);
1385 }
1386
1387 static acpi_status
1388 find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1389 {
1390         int *count = (int *)context;
1391
1392         if (!acpi_is_root_bridge(handle))
1393                 return AE_OK;
1394
1395         (*count)++;
1396         acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
1397                                     handle_hotplug_event_bridge, NULL);
1398
1399         return AE_OK ;
1400 }
1401
1402 static struct acpi_pci_driver acpi_pci_hp_driver = {
1403         .add =          add_bridge,
1404         .remove =       remove_bridge,
1405 };
1406
1407 /**
1408  * acpiphp_glue_init - initializes all PCI hotplug - ACPI glue data structures
1409  */
1410 int __init acpiphp_glue_init(void)
1411 {
1412         int num = 0;
1413
1414         acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
1415                         ACPI_UINT32_MAX, find_root_bridges, NULL, &num, NULL);
1416
1417         if (num <= 0)
1418                 return -1;
1419         else
1420                 acpi_pci_register_driver(&acpi_pci_hp_driver);
1421
1422         return 0;
1423 }
1424
1425
1426 /**
1427  * acpiphp_glue_exit - terminates all PCI hotplug - ACPI glue data structures
1428  *
1429  * This function frees all data allocated in acpiphp_glue_init().
1430  */
1431 void  acpiphp_glue_exit(void)
1432 {
1433         acpi_pci_unregister_driver(&acpi_pci_hp_driver);
1434 }
1435
1436
1437 /**
1438  * acpiphp_get_num_slots - count number of slots in a system
1439  */
1440 int __init acpiphp_get_num_slots(void)
1441 {
1442         struct acpiphp_bridge *bridge;
1443         int num_slots = 0;
1444
1445         list_for_each_entry(bridge, &bridge_list, list) {
1446                 dbg("Bus %04x:%02x has %d slot%s\n",
1447                                 pci_domain_nr(bridge->pci_bus),
1448                                 bridge->pci_bus->number, bridge->nr_slots,
1449                                 bridge->nr_slots == 1 ? "" : "s");
1450                 num_slots += bridge->nr_slots;
1451         }
1452
1453         dbg("Total %d slots\n", num_slots);
1454         return num_slots;
1455 }
1456
1457
1458 #if 0
1459 /**
1460  * acpiphp_for_each_slot - call function for each slot
1461  * @fn: callback function
1462  * @data: context to be passed to callback function
1463  */
1464 static int acpiphp_for_each_slot(acpiphp_callback fn, void *data)
1465 {
1466         struct list_head *node;
1467         struct acpiphp_bridge *bridge;
1468         struct acpiphp_slot *slot;
1469         int retval = 0;
1470
1471         list_for_each (node, &bridge_list) {
1472                 bridge = (struct acpiphp_bridge *)node;
1473                 for (slot = bridge->slots; slot; slot = slot->next) {
1474                         retval = fn(slot, data);
1475                         if (!retval)
1476                                 goto err_exit;
1477                 }
1478         }
1479
1480  err_exit:
1481         return retval;
1482 }
1483 #endif
1484
1485
1486 /**
1487  * acpiphp_enable_slot - power on slot
1488  * @slot: ACPI PHP slot
1489  */
1490 int acpiphp_enable_slot(struct acpiphp_slot *slot)
1491 {
1492         int retval;
1493
1494         mutex_lock(&slot->crit_sect);
1495
1496         /* wake up all functions */
1497         retval = power_on_slot(slot);
1498         if (retval)
1499                 goto err_exit;
1500
1501         if (get_slot_status(slot) == ACPI_STA_ALL) {
1502                 /* configure all functions */
1503                 retval = enable_device(slot);
1504                 if (retval)
1505                         power_off_slot(slot);
1506         } else {
1507                 dbg("%s: Slot status is not ACPI_STA_ALL\n", __func__);
1508                 power_off_slot(slot);
1509         }
1510
1511  err_exit:
1512         mutex_unlock(&slot->crit_sect);
1513         return retval;
1514 }
1515
1516 /**
1517  * acpiphp_disable_slot - power off slot
1518  * @slot: ACPI PHP slot
1519  */
1520 int acpiphp_disable_slot(struct acpiphp_slot *slot)
1521 {
1522         int retval = 0;
1523
1524         mutex_lock(&slot->crit_sect);
1525
1526         /* unconfigure all functions */
1527         retval = disable_device(slot);
1528         if (retval)
1529                 goto err_exit;
1530
1531         /* power off all functions */
1532         retval = power_off_slot(slot);
1533         if (retval)
1534                 goto err_exit;
1535
1536  err_exit:
1537         mutex_unlock(&slot->crit_sect);
1538         return retval;
1539 }
1540
1541
1542 /*
1543  * slot enabled:  1
1544  * slot disabled: 0
1545  */
1546 u8 acpiphp_get_power_status(struct acpiphp_slot *slot)
1547 {
1548         return (slot->flags & SLOT_POWEREDON);
1549 }
1550
1551
1552 /*
1553  * latch   open:  1
1554  * latch closed:  0
1555  */
1556 u8 acpiphp_get_latch_status(struct acpiphp_slot *slot)
1557 {
1558         unsigned int sta;
1559
1560         sta = get_slot_status(slot);
1561
1562         return (sta & ACPI_STA_SHOW_IN_UI) ? 0 : 1;
1563 }
1564
1565
1566 /*
1567  * adapter presence : 1
1568  *          absence : 0
1569  */
1570 u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot)
1571 {
1572         unsigned int sta;
1573
1574         sta = get_slot_status(slot);
1575
1576         return (sta == 0) ? 0 : 1;
1577 }