PCI hotplug: introduce functions for ACPI slot detection
[linux-2.6.git] / drivers / pci / hotplug / acpiphp_glue.c
1 /*
2  * ACPI PCI HotPlug glue functions to ACPI CA subsystem
3  *
4  * Copyright (C) 2002,2003 Takayoshi Kochi (t-kochi@bq.jp.nec.com)
5  * Copyright (C) 2002 Hiroshi Aono (h-aono@ap.jp.nec.com)
6  * Copyright (C) 2002,2003 NEC Corporation
7  * Copyright (C) 2003-2005 Matthew Wilcox (matthew.wilcox@hp.com)
8  * Copyright (C) 2003-2005 Hewlett Packard
9  * Copyright (C) 2005 Rajesh Shah (rajesh.shah@intel.com)
10  * Copyright (C) 2005 Intel Corporation
11  *
12  * All rights reserved.
13  *
14  * This program is free software; you can redistribute it and/or modify
15  * it under the terms of the GNU General Public License as published by
16  * the Free Software Foundation; either version 2 of the License, or (at
17  * your option) any later version.
18  *
19  * This program is distributed in the hope that it will be useful, but
20  * WITHOUT ANY WARRANTY; without even the implied warranty of
21  * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
22  * NON INFRINGEMENT.  See the GNU General Public License for more
23  * details.
24  *
25  * You should have received a copy of the GNU General Public License
26  * along with this program; if not, write to the Free Software
27  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
28  *
29  * Send feedback to <kristen.c.accardi@intel.com>
30  *
31  */
32
33 /*
34  * Lifetime rules for pci_dev:
35  *  - The one in acpiphp_func has its refcount elevated by pci_get_slot()
36  *    when the driver is loaded or when an insertion event occurs.  It loses
37  *    a refcount when its ejected or the driver unloads.
38  *  - The one in acpiphp_bridge has its refcount elevated by pci_get_slot()
39  *    when the bridge is scanned and it loses a refcount when the bridge
40  *    is removed.
41  */
42
43 #include <linux/init.h>
44 #include <linux/module.h>
45
46 #include <linux/kernel.h>
47 #include <linux/pci.h>
48 #include <linux/pci_hotplug.h>
49 #include <linux/pci-acpi.h>
50 #include <linux/mutex.h>
51
52 #include "../pci.h"
53 #include "acpiphp.h"
54
55 static LIST_HEAD(bridge_list);
56 static LIST_HEAD(ioapic_list);
57 static DEFINE_SPINLOCK(ioapic_list_lock);
58
59 #define MY_NAME "acpiphp_glue"
60
61 static void handle_hotplug_event_bridge (acpi_handle, u32, void *);
62 static void acpiphp_sanitize_bus(struct pci_bus *bus);
63 static void acpiphp_set_hpp_values(acpi_handle handle, struct pci_bus *bus);
64 static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context);
65
66 /* callback routine to check for the existence of a pci dock device */
67 static acpi_status
68 is_pci_dock_device(acpi_handle handle, u32 lvl, void *context, void **rv)
69 {
70         int *count = (int *)context;
71
72         if (is_dock_device(handle)) {
73                 (*count)++;
74                 return AE_CTRL_TERMINATE;
75         } else {
76                 return AE_OK;
77         }
78 }
79
80 /*
81  * the _DCK method can do funny things... and sometimes not
82  * hah-hah funny.
83  *
84  * TBD - figure out a way to only call fixups for
85  * systems that require them.
86  */
87 static int post_dock_fixups(struct notifier_block *nb, unsigned long val,
88         void *v)
89 {
90         struct acpiphp_func *func = container_of(nb, struct acpiphp_func, nb);
91         struct pci_bus *bus = func->slot->bridge->pci_bus;
92         u32 buses;
93
94         if (!bus->self)
95                 return  NOTIFY_OK;
96
97         /* fixup bad _DCK function that rewrites
98          * secondary bridge on slot
99          */
100         pci_read_config_dword(bus->self,
101                         PCI_PRIMARY_BUS,
102                         &buses);
103
104         if (((buses >> 8) & 0xff) != bus->secondary) {
105                 buses = (buses & 0xff000000)
106                         | ((unsigned int)(bus->primary)     <<  0)
107                         | ((unsigned int)(bus->secondary)   <<  8)
108                         | ((unsigned int)(bus->subordinate) << 16);
109                 pci_write_config_dword(bus->self, PCI_PRIMARY_BUS, buses);
110         }
111         return NOTIFY_OK;
112 }
113
114
115 static struct acpi_dock_ops acpiphp_dock_ops = {
116         .handler = handle_hotplug_event_func,
117 };
118
119 /* callback routine to register each ACPI PCI slot object */
120 static acpi_status
121 register_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
122 {
123         struct acpiphp_bridge *bridge = (struct acpiphp_bridge *)context;
124         struct acpiphp_slot *slot;
125         struct acpiphp_func *newfunc;
126         acpi_handle tmp;
127         acpi_status status = AE_OK;
128         unsigned long long adr, sun;
129         int device, function, retval;
130         struct pci_bus *pbus = bridge->pci_bus;
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         /* associate corresponding pci_dev */
215         newfunc->pci_dev = pci_get_slot(pbus, PCI_DEVFN(device, function));
216         if (newfunc->pci_dev) {
217                 slot->flags |= (SLOT_ENABLED | SLOT_POWEREDON);
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                 acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge_handle, (u32)1,
270                                     is_pci_dock_device, (void *)&found, NULL);
271         }
272         return found;
273 }
274
275
276 /* decode ACPI 2.0 _HPP hot plug parameters */
277 static void decode_hpp(struct acpiphp_bridge *bridge)
278 {
279         acpi_status status;
280
281         status = acpi_get_hp_params_from_firmware(bridge->pci_bus, &bridge->hpp);
282         if (ACPI_FAILURE(status) ||
283             !bridge->hpp.t0 || (bridge->hpp.t0->revision > 1)) {
284                 /* use default numbers */
285                 printk(KERN_WARNING
286                        "%s: Could not get hotplug parameters. Use defaults\n",
287                        __func__);
288                 bridge->hpp.t0 = &bridge->hpp.type0_data;
289                 bridge->hpp.t0->revision = 0;
290                 bridge->hpp.t0->cache_line_size = 0x10;
291                 bridge->hpp.t0->latency_timer = 0x40;
292                 bridge->hpp.t0->enable_serr = 0;
293                 bridge->hpp.t0->enable_perr = 0;
294         }
295 }
296
297
298
299 /* initialize miscellaneous stuff for both root and PCI-to-PCI bridge */
300 static void init_bridge_misc(struct acpiphp_bridge *bridge)
301 {
302         acpi_status status;
303
304         /* decode ACPI 2.0 _HPP (hot plug parameters) */
305         decode_hpp(bridge);
306
307         /* must be added to the list prior to calling register_slot */
308         list_add(&bridge->list, &bridge_list);
309
310         /* register all slot objects under this bridge */
311         status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge->handle, (u32)1,
312                                      register_slot, bridge, NULL);
313         if (ACPI_FAILURE(status)) {
314                 list_del(&bridge->list);
315                 return;
316         }
317
318         /* install notify handler */
319         if (bridge->type != BRIDGE_TYPE_HOST) {
320                 if ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func) {
321                         status = acpi_remove_notify_handler(bridge->func->handle,
322                                                 ACPI_SYSTEM_NOTIFY,
323                                                 handle_hotplug_event_func);
324                         if (ACPI_FAILURE(status))
325                                 err("failed to remove notify handler\n");
326                 }
327                 status = acpi_install_notify_handler(bridge->handle,
328                                              ACPI_SYSTEM_NOTIFY,
329                                              handle_hotplug_event_bridge,
330                                              bridge);
331
332                 if (ACPI_FAILURE(status)) {
333                         err("failed to register interrupt notify handler\n");
334                 }
335         }
336 }
337
338
339 /* find acpiphp_func from acpiphp_bridge */
340 static struct acpiphp_func *acpiphp_bridge_handle_to_function(acpi_handle handle)
341 {
342         struct list_head *node, *l;
343         struct acpiphp_bridge *bridge;
344         struct acpiphp_slot *slot;
345         struct acpiphp_func *func;
346
347         list_for_each(node, &bridge_list) {
348                 bridge = list_entry(node, struct acpiphp_bridge, list);
349                 for (slot = bridge->slots; slot; slot = slot->next) {
350                         list_for_each(l, &slot->funcs) {
351                                 func = list_entry(l, struct acpiphp_func,
352                                                         sibling);
353                                 if (func->handle == handle)
354                                         return func;
355                         }
356                 }
357         }
358
359         return NULL;
360 }
361
362
363 static inline void config_p2p_bridge_flags(struct acpiphp_bridge *bridge)
364 {
365         acpi_handle dummy_handle;
366
367         if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
368                                         "_STA", &dummy_handle)))
369                 bridge->flags |= BRIDGE_HAS_STA;
370
371         if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
372                                         "_EJ0", &dummy_handle)))
373                 bridge->flags |= BRIDGE_HAS_EJ0;
374
375         if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
376                                         "_PS0", &dummy_handle)))
377                 bridge->flags |= BRIDGE_HAS_PS0;
378
379         if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
380                                         "_PS3", &dummy_handle)))
381                 bridge->flags |= BRIDGE_HAS_PS3;
382
383         /* is this ejectable p2p bridge? */
384         if (bridge->flags & BRIDGE_HAS_EJ0) {
385                 struct acpiphp_func *func;
386
387                 dbg("found ejectable p2p bridge\n");
388
389                 /* make link between PCI bridge and PCI function */
390                 func = acpiphp_bridge_handle_to_function(bridge->handle);
391                 if (!func)
392                         return;
393                 bridge->func = func;
394                 func->bridge = bridge;
395         }
396 }
397
398
399 /* allocate and initialize host bridge data structure */
400 static void add_host_bridge(acpi_handle *handle, struct pci_bus *pci_bus)
401 {
402         struct acpiphp_bridge *bridge;
403
404         bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
405         if (bridge == NULL)
406                 return;
407
408         bridge->type = BRIDGE_TYPE_HOST;
409         bridge->handle = handle;
410
411         bridge->pci_bus = pci_bus;
412
413         spin_lock_init(&bridge->res_lock);
414
415         init_bridge_misc(bridge);
416 }
417
418
419 /* allocate and initialize PCI-to-PCI bridge data structure */
420 static void add_p2p_bridge(acpi_handle *handle, struct pci_dev *pci_dev)
421 {
422         struct acpiphp_bridge *bridge;
423
424         bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
425         if (bridge == NULL) {
426                 err("out of memory\n");
427                 return;
428         }
429
430         bridge->type = BRIDGE_TYPE_P2P;
431         bridge->handle = handle;
432         config_p2p_bridge_flags(bridge);
433
434         bridge->pci_dev = pci_dev_get(pci_dev);
435         bridge->pci_bus = pci_dev->subordinate;
436         if (!bridge->pci_bus) {
437                 err("This is not a PCI-to-PCI bridge!\n");
438                 goto err;
439         }
440
441         spin_lock_init(&bridge->res_lock);
442
443         init_bridge_misc(bridge);
444         return;
445  err:
446         pci_dev_put(pci_dev);
447         kfree(bridge);
448         return;
449 }
450
451
452 /* callback routine to find P2P bridges */
453 static acpi_status
454 find_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
455 {
456         acpi_status status;
457         acpi_handle dummy_handle;
458         unsigned long long tmp;
459         int device, function;
460         struct pci_dev *dev;
461         struct pci_bus *pci_bus = context;
462
463         status = acpi_get_handle(handle, "_ADR", &dummy_handle);
464         if (ACPI_FAILURE(status))
465                 return AE_OK;           /* continue */
466
467         status = acpi_evaluate_integer(handle, "_ADR", NULL, &tmp);
468         if (ACPI_FAILURE(status)) {
469                 dbg("%s: _ADR evaluation failure\n", __func__);
470                 return AE_OK;
471         }
472
473         device = (tmp >> 16) & 0xffff;
474         function = tmp & 0xffff;
475
476         dev = pci_get_slot(pci_bus, PCI_DEVFN(device, function));
477
478         if (!dev || !dev->subordinate)
479                 goto out;
480
481         /* check if this bridge has ejectable slots */
482         if ((detect_ejectable_slots(dev->subordinate) > 0)) {
483                 dbg("found PCI-to-PCI bridge at PCI %s\n", pci_name(dev));
484                 add_p2p_bridge(handle, dev);
485         }
486
487         /* search P2P bridges under this p2p bridge */
488         status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
489                                      find_p2p_bridge, dev->subordinate, NULL);
490         if (ACPI_FAILURE(status))
491                 warn("find_p2p_bridge failed (error code = 0x%x)\n", status);
492
493  out:
494         pci_dev_put(dev);
495         return AE_OK;
496 }
497
498
499 /* find hot-pluggable slots, and then find P2P bridge */
500 static int add_bridge(acpi_handle handle)
501 {
502         acpi_status status;
503         unsigned long long tmp;
504         int seg, bus;
505         acpi_handle dummy_handle;
506         struct pci_bus *pci_bus;
507
508         /* if the bridge doesn't have _STA, we assume it is always there */
509         status = acpi_get_handle(handle, "_STA", &dummy_handle);
510         if (ACPI_SUCCESS(status)) {
511                 status = acpi_evaluate_integer(handle, "_STA", NULL, &tmp);
512                 if (ACPI_FAILURE(status)) {
513                         dbg("%s: _STA evaluation failure\n", __func__);
514                         return 0;
515                 }
516                 if ((tmp & ACPI_STA_FUNCTIONING) == 0)
517                         /* don't register this object */
518                         return 0;
519         }
520
521         /* get PCI segment number */
522         status = acpi_evaluate_integer(handle, "_SEG", NULL, &tmp);
523
524         seg = ACPI_SUCCESS(status) ? tmp : 0;
525
526         /* get PCI bus number */
527         status = acpi_evaluate_integer(handle, "_BBN", NULL, &tmp);
528
529         if (ACPI_SUCCESS(status)) {
530                 bus = tmp;
531         } else {
532                 warn("can't get bus number, assuming 0\n");
533                 bus = 0;
534         }
535
536         pci_bus = pci_find_bus(seg, bus);
537         if (!pci_bus) {
538                 err("Can't find bus %04x:%02x\n", seg, bus);
539                 return 0;
540         }
541
542         /* check if this bridge has ejectable slots */
543         if (detect_ejectable_slots(pci_bus) > 0) {
544                 dbg("found PCI host-bus bridge with hot-pluggable slots\n");
545                 add_host_bridge(handle, pci_bus);
546         }
547
548         /* search P2P bridges under this host bridge */
549         status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
550                                      find_p2p_bridge, pci_bus, NULL);
551
552         if (ACPI_FAILURE(status))
553                 warn("find_p2p_bridge failed (error code = 0x%x)\n", status);
554
555         return 0;
556 }
557
558 static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle)
559 {
560         struct list_head *head;
561         list_for_each(head, &bridge_list) {
562                 struct acpiphp_bridge *bridge = list_entry(head,
563                                                 struct acpiphp_bridge, list);
564                 if (bridge->handle == handle)
565                         return bridge;
566         }
567
568         return NULL;
569 }
570
571 static void cleanup_bridge(struct acpiphp_bridge *bridge)
572 {
573         struct list_head *list, *tmp;
574         struct acpiphp_slot *slot;
575         acpi_status status;
576         acpi_handle handle = bridge->handle;
577
578         status = acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
579                                             handle_hotplug_event_bridge);
580         if (ACPI_FAILURE(status))
581                 err("failed to remove notify handler\n");
582
583         if ((bridge->type != BRIDGE_TYPE_HOST) &&
584             ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func)) {
585                 status = acpi_install_notify_handler(bridge->func->handle,
586                                                 ACPI_SYSTEM_NOTIFY,
587                                                 handle_hotplug_event_func,
588                                                 bridge->func);
589                 if (ACPI_FAILURE(status))
590                         err("failed to install interrupt notify handler\n");
591         }
592
593         slot = bridge->slots;
594         while (slot) {
595                 struct acpiphp_slot *next = slot->next;
596                 list_for_each_safe (list, tmp, &slot->funcs) {
597                         struct acpiphp_func *func;
598                         func = list_entry(list, struct acpiphp_func, sibling);
599                         if (is_dock_device(func->handle)) {
600                                 unregister_hotplug_dock_device(func->handle);
601                                 unregister_dock_notifier(&func->nb);
602                         }
603                         if (!(func->flags & FUNC_HAS_DCK)) {
604                                 status = acpi_remove_notify_handler(func->handle,
605                                                 ACPI_SYSTEM_NOTIFY,
606                                                 handle_hotplug_event_func);
607                                 if (ACPI_FAILURE(status))
608                                         err("failed to remove notify handler\n");
609                         }
610                         pci_dev_put(func->pci_dev);
611                         list_del(list);
612                         kfree(func);
613                 }
614                 acpiphp_unregister_hotplug_slot(slot);
615                 list_del(&slot->funcs);
616                 kfree(slot);
617                 slot = next;
618         }
619
620         pci_dev_put(bridge->pci_dev);
621         list_del(&bridge->list);
622         kfree(bridge);
623 }
624
625 static acpi_status
626 cleanup_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
627 {
628         struct acpiphp_bridge *bridge;
629
630         /* cleanup p2p bridges under this P2P bridge
631            in a depth-first manner */
632         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
633                                 cleanup_p2p_bridge, NULL, NULL);
634
635         bridge = acpiphp_handle_to_bridge(handle);
636         if (bridge)
637                 cleanup_bridge(bridge);
638
639         return AE_OK;
640 }
641
642 static void remove_bridge(acpi_handle handle)
643 {
644         struct acpiphp_bridge *bridge;
645
646         /* cleanup p2p bridges under this host bridge
647            in a depth-first manner */
648         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
649                                 (u32)1, cleanup_p2p_bridge, NULL, NULL);
650
651         /*
652          * On root bridges with hotplug slots directly underneath (ie,
653          * no p2p bridge inbetween), we call cleanup_bridge(). 
654          *
655          * The else clause cleans up root bridges that either had no
656          * hotplug slots at all, or had a p2p bridge underneath.
657          */
658         bridge = acpiphp_handle_to_bridge(handle);
659         if (bridge)
660                 cleanup_bridge(bridge);
661         else
662                 acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
663                                            handle_hotplug_event_bridge);
664 }
665
666 static struct pci_dev * get_apic_pci_info(acpi_handle handle)
667 {
668         struct acpi_pci_id id;
669         struct pci_bus *bus;
670         struct pci_dev *dev;
671
672         if (ACPI_FAILURE(acpi_get_pci_id(handle, &id)))
673                 return NULL;
674
675         bus = pci_find_bus(id.segment, id.bus);
676         if (!bus)
677                 return NULL;
678
679         dev = pci_get_slot(bus, PCI_DEVFN(id.device, id.function));
680         if (!dev)
681                 return NULL;
682
683         if ((dev->class != PCI_CLASS_SYSTEM_PIC_IOAPIC) &&
684             (dev->class != PCI_CLASS_SYSTEM_PIC_IOXAPIC))
685         {
686                 pci_dev_put(dev);
687                 return NULL;
688         }
689
690         return dev;
691 }
692
693 static int get_gsi_base(acpi_handle handle, u32 *gsi_base)
694 {
695         acpi_status status;
696         int result = -1;
697         unsigned long long gsb;
698         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
699         union acpi_object *obj;
700         void *table;
701
702         status = acpi_evaluate_integer(handle, "_GSB", NULL, &gsb);
703         if (ACPI_SUCCESS(status)) {
704                 *gsi_base = (u32)gsb;
705                 return 0;
706         }
707
708         status = acpi_evaluate_object(handle, "_MAT", NULL, &buffer);
709         if (ACPI_FAILURE(status) || !buffer.length || !buffer.pointer)
710                 return -1;
711
712         obj = buffer.pointer;
713         if (obj->type != ACPI_TYPE_BUFFER)
714                 goto out;
715
716         table = obj->buffer.pointer;
717         switch (((struct acpi_subtable_header *)table)->type) {
718         case ACPI_MADT_TYPE_IO_SAPIC:
719                 *gsi_base = ((struct acpi_madt_io_sapic *)table)->global_irq_base;
720                 result = 0;
721                 break;
722         case ACPI_MADT_TYPE_IO_APIC:
723                 *gsi_base = ((struct acpi_madt_io_apic *)table)->global_irq_base;
724                 result = 0;
725                 break;
726         default:
727                 break;
728         }
729  out:
730         kfree(buffer.pointer);
731         return result;
732 }
733
734 static acpi_status
735 ioapic_add(acpi_handle handle, u32 lvl, void *context, void **rv)
736 {
737         acpi_status status;
738         unsigned long long sta;
739         acpi_handle tmp;
740         struct pci_dev *pdev;
741         u32 gsi_base;
742         u64 phys_addr;
743         struct acpiphp_ioapic *ioapic;
744
745         /* Evaluate _STA if present */
746         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
747         if (ACPI_SUCCESS(status) && sta != ACPI_STA_ALL)
748                 return AE_CTRL_DEPTH;
749
750         /* Scan only PCI bus scope */
751         status = acpi_get_handle(handle, "_HID", &tmp);
752         if (ACPI_SUCCESS(status))
753                 return AE_CTRL_DEPTH;
754
755         if (get_gsi_base(handle, &gsi_base))
756                 return AE_OK;
757
758         ioapic = kmalloc(sizeof(*ioapic), GFP_KERNEL);
759         if (!ioapic)
760                 return AE_NO_MEMORY;
761
762         pdev = get_apic_pci_info(handle);
763         if (!pdev)
764                 goto exit_kfree;
765
766         if (pci_enable_device(pdev))
767                 goto exit_pci_dev_put;
768
769         pci_set_master(pdev);
770
771         if (pci_request_region(pdev, 0, "I/O APIC(acpiphp)"))
772                 goto exit_pci_disable_device;
773
774         phys_addr = pci_resource_start(pdev, 0);
775         if (acpi_register_ioapic(handle, phys_addr, gsi_base))
776                 goto exit_pci_release_region;
777
778         ioapic->gsi_base = gsi_base;
779         ioapic->dev = pdev;
780         spin_lock(&ioapic_list_lock);
781         list_add_tail(&ioapic->list, &ioapic_list);
782         spin_unlock(&ioapic_list_lock);
783
784         return AE_OK;
785
786  exit_pci_release_region:
787         pci_release_region(pdev, 0);
788  exit_pci_disable_device:
789         pci_disable_device(pdev);
790  exit_pci_dev_put:
791         pci_dev_put(pdev);
792  exit_kfree:
793         kfree(ioapic);
794
795         return AE_OK;
796 }
797
798 static acpi_status
799 ioapic_remove(acpi_handle handle, u32 lvl, void *context, void **rv)
800 {
801         acpi_status status;
802         unsigned long long sta;
803         acpi_handle tmp;
804         u32 gsi_base;
805         struct acpiphp_ioapic *pos, *n, *ioapic = NULL;
806
807         /* Evaluate _STA if present */
808         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
809         if (ACPI_SUCCESS(status) && sta != ACPI_STA_ALL)
810                 return AE_CTRL_DEPTH;
811
812         /* Scan only PCI bus scope */
813         status = acpi_get_handle(handle, "_HID", &tmp);
814         if (ACPI_SUCCESS(status))
815                 return AE_CTRL_DEPTH;
816
817         if (get_gsi_base(handle, &gsi_base))
818                 return AE_OK;
819
820         acpi_unregister_ioapic(handle, gsi_base);
821
822         spin_lock(&ioapic_list_lock);
823         list_for_each_entry_safe(pos, n, &ioapic_list, list) {
824                 if (pos->gsi_base != gsi_base)
825                         continue;
826                 ioapic = pos;
827                 list_del(&ioapic->list);
828                 break;
829         }
830         spin_unlock(&ioapic_list_lock);
831
832         if (!ioapic)
833                 return AE_OK;
834
835         pci_release_region(ioapic->dev, 0);
836         pci_disable_device(ioapic->dev);
837         pci_dev_put(ioapic->dev);
838         kfree(ioapic);
839
840         return AE_OK;
841 }
842
843 static int acpiphp_configure_ioapics(acpi_handle handle)
844 {
845         ioapic_add(handle, 0, NULL, NULL);
846         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
847                             ACPI_UINT32_MAX, ioapic_add, NULL, NULL);
848         return 0;
849 }
850
851 static int acpiphp_unconfigure_ioapics(acpi_handle handle)
852 {
853         ioapic_remove(handle, 0, NULL, NULL);
854         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
855                             ACPI_UINT32_MAX, ioapic_remove, NULL, NULL);
856         return 0;
857 }
858
859 static int power_on_slot(struct acpiphp_slot *slot)
860 {
861         acpi_status status;
862         struct acpiphp_func *func;
863         struct list_head *l;
864         int retval = 0;
865
866         /* if already enabled, just skip */
867         if (slot->flags & SLOT_POWEREDON)
868                 goto err_exit;
869
870         list_for_each (l, &slot->funcs) {
871                 func = list_entry(l, struct acpiphp_func, sibling);
872
873                 if (func->flags & FUNC_HAS_PS0) {
874                         dbg("%s: executing _PS0\n", __func__);
875                         status = acpi_evaluate_object(func->handle, "_PS0", NULL, NULL);
876                         if (ACPI_FAILURE(status)) {
877                                 warn("%s: _PS0 failed\n", __func__);
878                                 retval = -1;
879                                 goto err_exit;
880                         } else
881                                 break;
882                 }
883         }
884
885         /* TBD: evaluate _STA to check if the slot is enabled */
886
887         slot->flags |= SLOT_POWEREDON;
888
889  err_exit:
890         return retval;
891 }
892
893
894 static int power_off_slot(struct acpiphp_slot *slot)
895 {
896         acpi_status status;
897         struct acpiphp_func *func;
898         struct list_head *l;
899
900         int retval = 0;
901
902         /* if already disabled, just skip */
903         if ((slot->flags & SLOT_POWEREDON) == 0)
904                 goto err_exit;
905
906         list_for_each (l, &slot->funcs) {
907                 func = list_entry(l, struct acpiphp_func, sibling);
908
909                 if (func->flags & FUNC_HAS_PS3) {
910                         status = acpi_evaluate_object(func->handle, "_PS3", NULL, NULL);
911                         if (ACPI_FAILURE(status)) {
912                                 warn("%s: _PS3 failed\n", __func__);
913                                 retval = -1;
914                                 goto err_exit;
915                         } else
916                                 break;
917                 }
918         }
919
920         /* TBD: evaluate _STA to check if the slot is disabled */
921
922         slot->flags &= (~SLOT_POWEREDON);
923
924  err_exit:
925         return retval;
926 }
927
928
929
930 /**
931  * acpiphp_max_busnr - return the highest reserved bus number under the given bus.
932  * @bus: bus to start search with
933  */
934 static unsigned char acpiphp_max_busnr(struct pci_bus *bus)
935 {
936         struct list_head *tmp;
937         unsigned char max, n;
938
939         /*
940          * pci_bus_max_busnr will return the highest
941          * reserved busnr for all these children.
942          * that is equivalent to the bus->subordinate
943          * value.  We don't want to use the parent's
944          * bus->subordinate value because it could have
945          * padding in it.
946          */
947         max = bus->secondary;
948
949         list_for_each(tmp, &bus->children) {
950                 n = pci_bus_max_busnr(pci_bus_b(tmp));
951                 if (n > max)
952                         max = n;
953         }
954         return max;
955 }
956
957
958 /**
959  * acpiphp_bus_add - add a new bus to acpi subsystem
960  * @func: acpiphp_func of the bridge
961  */
962 static int acpiphp_bus_add(struct acpiphp_func *func)
963 {
964         acpi_handle phandle;
965         struct acpi_device *device, *pdevice;
966         int ret_val;
967
968         acpi_get_parent(func->handle, &phandle);
969         if (acpi_bus_get_device(phandle, &pdevice)) {
970                 dbg("no parent device, assuming NULL\n");
971                 pdevice = NULL;
972         }
973         if (!acpi_bus_get_device(func->handle, &device)) {
974                 dbg("bus exists... trim\n");
975                 /* this shouldn't be in here, so remove
976                  * the bus then re-add it...
977                  */
978                 ret_val = acpi_bus_trim(device, 1);
979                 dbg("acpi_bus_trim return %x\n", ret_val);
980         }
981
982         ret_val = acpi_bus_add(&device, pdevice, func->handle,
983                 ACPI_BUS_TYPE_DEVICE);
984         if (ret_val) {
985                 dbg("error adding bus, %x\n",
986                         -ret_val);
987                 goto acpiphp_bus_add_out;
988         }
989         /*
990          * try to start anyway.  We could have failed to add
991          * simply because this bus had previously been added
992          * on another add.  Don't bother with the return value
993          * we just keep going.
994          */
995         ret_val = acpi_bus_start(device);
996
997 acpiphp_bus_add_out:
998         return ret_val;
999 }
1000
1001
1002 /**
1003  * acpiphp_bus_trim - trim a bus from acpi subsystem
1004  * @handle: handle to acpi namespace
1005  */
1006 static int acpiphp_bus_trim(acpi_handle handle)
1007 {
1008         struct acpi_device *device;
1009         int retval;
1010
1011         retval = acpi_bus_get_device(handle, &device);
1012         if (retval) {
1013                 dbg("acpi_device not found\n");
1014                 return retval;
1015         }
1016
1017         retval = acpi_bus_trim(device, 1);
1018         if (retval)
1019                 err("cannot remove from acpi list\n");
1020
1021         return retval;
1022 }
1023
1024 /**
1025  * enable_device - enable, configure a slot
1026  * @slot: slot to be enabled
1027  *
1028  * This function should be called per *physical slot*,
1029  * not per each slot object in ACPI namespace.
1030  */
1031 static int __ref enable_device(struct acpiphp_slot *slot)
1032 {
1033         struct pci_dev *dev;
1034         struct pci_bus *bus = slot->bridge->pci_bus;
1035         struct list_head *l;
1036         struct acpiphp_func *func;
1037         int retval = 0;
1038         int num, max, pass;
1039         acpi_status status;
1040
1041         if (slot->flags & SLOT_ENABLED)
1042                 goto err_exit;
1043
1044         /* sanity check: dev should be NULL when hot-plugged in */
1045         dev = pci_get_slot(bus, PCI_DEVFN(slot->device, 0));
1046         if (dev) {
1047                 /* This case shouldn't happen */
1048                 err("pci_dev structure already exists.\n");
1049                 pci_dev_put(dev);
1050                 retval = -1;
1051                 goto err_exit;
1052         }
1053
1054         num = pci_scan_slot(bus, PCI_DEVFN(slot->device, 0));
1055         if (num == 0) {
1056                 err("No new device found\n");
1057                 retval = -1;
1058                 goto err_exit;
1059         }
1060
1061         max = acpiphp_max_busnr(bus);
1062         for (pass = 0; pass < 2; pass++) {
1063                 list_for_each_entry(dev, &bus->devices, bus_list) {
1064                         if (PCI_SLOT(dev->devfn) != slot->device)
1065                                 continue;
1066                         if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
1067                             dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
1068                                 max = pci_scan_bridge(bus, dev, max, pass);
1069                                 if (pass && dev->subordinate)
1070                                         pci_bus_size_bridges(dev->subordinate);
1071                         }
1072                 }
1073         }
1074
1075         list_for_each (l, &slot->funcs) {
1076                 func = list_entry(l, struct acpiphp_func, sibling);
1077                 acpiphp_bus_add(func);
1078         }
1079
1080         pci_bus_assign_resources(bus);
1081         acpiphp_sanitize_bus(bus);
1082         acpiphp_set_hpp_values(slot->bridge->handle, bus);
1083         list_for_each_entry(func, &slot->funcs, sibling)
1084                 acpiphp_configure_ioapics(func->handle);
1085         pci_enable_bridges(bus);
1086         pci_bus_add_devices(bus);
1087
1088         /* associate pci_dev to our representation */
1089         list_for_each (l, &slot->funcs) {
1090                 func = list_entry(l, struct acpiphp_func, sibling);
1091                 func->pci_dev = pci_get_slot(bus, PCI_DEVFN(slot->device,
1092                                                         func->function));
1093                 if (!func->pci_dev)
1094                         continue;
1095
1096                 if (func->pci_dev->hdr_type != PCI_HEADER_TYPE_BRIDGE &&
1097                     func->pci_dev->hdr_type != PCI_HEADER_TYPE_CARDBUS)
1098                         continue;
1099
1100                 status = find_p2p_bridge(func->handle, (u32)1, bus, NULL);
1101                 if (ACPI_FAILURE(status))
1102                         warn("find_p2p_bridge failed (error code = 0x%x)\n",
1103                                 status);
1104         }
1105
1106         slot->flags |= SLOT_ENABLED;
1107
1108  err_exit:
1109         return retval;
1110 }
1111
1112 static void disable_bridges(struct pci_bus *bus)
1113 {
1114         struct pci_dev *dev;
1115         list_for_each_entry(dev, &bus->devices, bus_list) {
1116                 if (dev->subordinate) {
1117                         disable_bridges(dev->subordinate);
1118                         pci_disable_device(dev);
1119                 }
1120         }
1121 }
1122
1123 /**
1124  * disable_device - disable a slot
1125  * @slot: ACPI PHP slot
1126  */
1127 static int disable_device(struct acpiphp_slot *slot)
1128 {
1129         int retval = 0;
1130         struct acpiphp_func *func;
1131         struct list_head *l;
1132
1133         /* is this slot already disabled? */
1134         if (!(slot->flags & SLOT_ENABLED))
1135                 goto err_exit;
1136
1137         list_for_each (l, &slot->funcs) {
1138                 func = list_entry(l, struct acpiphp_func, sibling);
1139
1140                 if (func->bridge) {
1141                         /* cleanup p2p bridges under this P2P bridge */
1142                         cleanup_p2p_bridge(func->bridge->handle,
1143                                                 (u32)1, NULL, NULL);
1144                         func->bridge = NULL;
1145                 }
1146
1147                 if (func->pci_dev) {
1148                         pci_stop_bus_device(func->pci_dev);
1149                         if (func->pci_dev->subordinate) {
1150                                 disable_bridges(func->pci_dev->subordinate);
1151                                 pci_disable_device(func->pci_dev);
1152                         }
1153                 }
1154         }
1155
1156         list_for_each (l, &slot->funcs) {
1157                 func = list_entry(l, struct acpiphp_func, sibling);
1158
1159                 acpiphp_unconfigure_ioapics(func->handle);
1160                 acpiphp_bus_trim(func->handle);
1161                 /* try to remove anyway.
1162                  * acpiphp_bus_add might have been failed */
1163
1164                 if (!func->pci_dev)
1165                         continue;
1166
1167                 pci_remove_bus_device(func->pci_dev);
1168                 pci_dev_put(func->pci_dev);
1169                 func->pci_dev = NULL;
1170         }
1171
1172         slot->flags &= (~SLOT_ENABLED);
1173
1174  err_exit:
1175         return retval;
1176 }
1177
1178
1179 /**
1180  * get_slot_status - get ACPI slot status
1181  * @slot: ACPI PHP slot
1182  *
1183  * If a slot has _STA for each function and if any one of them
1184  * returned non-zero status, return it.
1185  *
1186  * If a slot doesn't have _STA and if any one of its functions'
1187  * configuration space is configured, return 0x0f as a _STA.
1188  *
1189  * Otherwise return 0.
1190  */
1191 static unsigned int get_slot_status(struct acpiphp_slot *slot)
1192 {
1193         acpi_status status;
1194         unsigned long long sta = 0;
1195         u32 dvid;
1196         struct list_head *l;
1197         struct acpiphp_func *func;
1198
1199         list_for_each (l, &slot->funcs) {
1200                 func = list_entry(l, struct acpiphp_func, sibling);
1201
1202                 if (func->flags & FUNC_HAS_STA) {
1203                         status = acpi_evaluate_integer(func->handle, "_STA", NULL, &sta);
1204                         if (ACPI_SUCCESS(status) && sta)
1205                                 break;
1206                 } else {
1207                         pci_bus_read_config_dword(slot->bridge->pci_bus,
1208                                                   PCI_DEVFN(slot->device,
1209                                                             func->function),
1210                                                   PCI_VENDOR_ID, &dvid);
1211                         if (dvid != 0xffffffff) {
1212                                 sta = ACPI_STA_ALL;
1213                                 break;
1214                         }
1215                 }
1216         }
1217
1218         return (unsigned int)sta;
1219 }
1220
1221 /**
1222  * acpiphp_eject_slot - physically eject the slot
1223  * @slot: ACPI PHP slot
1224  */
1225 int acpiphp_eject_slot(struct acpiphp_slot *slot)
1226 {
1227         acpi_status status;
1228         struct acpiphp_func *func;
1229         struct list_head *l;
1230         struct acpi_object_list arg_list;
1231         union acpi_object arg;
1232
1233         list_for_each (l, &slot->funcs) {
1234                 func = list_entry(l, struct acpiphp_func, sibling);
1235
1236                 /* We don't want to call _EJ0 on non-existing functions. */
1237                 if ((func->flags & FUNC_HAS_EJ0)) {
1238                         /* _EJ0 method take one argument */
1239                         arg_list.count = 1;
1240                         arg_list.pointer = &arg;
1241                         arg.type = ACPI_TYPE_INTEGER;
1242                         arg.integer.value = 1;
1243
1244                         status = acpi_evaluate_object(func->handle, "_EJ0", &arg_list, NULL);
1245                         if (ACPI_FAILURE(status)) {
1246                                 warn("%s: _EJ0 failed\n", __func__);
1247                                 return -1;
1248                         } else
1249                                 break;
1250                 }
1251         }
1252         return 0;
1253 }
1254
1255 /**
1256  * acpiphp_check_bridge - re-enumerate devices
1257  * @bridge: where to begin re-enumeration
1258  *
1259  * Iterate over all slots under this bridge and make sure that if a
1260  * card is present they are enabled, and if not they are disabled.
1261  */
1262 static int acpiphp_check_bridge(struct acpiphp_bridge *bridge)
1263 {
1264         struct acpiphp_slot *slot;
1265         int retval = 0;
1266         int enabled, disabled;
1267
1268         enabled = disabled = 0;
1269
1270         for (slot = bridge->slots; slot; slot = slot->next) {
1271                 unsigned int status = get_slot_status(slot);
1272                 if (slot->flags & SLOT_ENABLED) {
1273                         if (status == ACPI_STA_ALL)
1274                                 continue;
1275                         retval = acpiphp_disable_slot(slot);
1276                         if (retval) {
1277                                 err("Error occurred in disabling\n");
1278                                 goto err_exit;
1279                         } else {
1280                                 acpiphp_eject_slot(slot);
1281                         }
1282                         disabled++;
1283                 } else {
1284                         if (status != ACPI_STA_ALL)
1285                                 continue;
1286                         retval = acpiphp_enable_slot(slot);
1287                         if (retval) {
1288                                 err("Error occurred in enabling\n");
1289                                 goto err_exit;
1290                         }
1291                         enabled++;
1292                 }
1293         }
1294
1295         dbg("%s: %d enabled, %d disabled\n", __func__, enabled, disabled);
1296
1297  err_exit:
1298         return retval;
1299 }
1300
1301 static void program_hpp(struct pci_dev *dev, struct acpiphp_bridge *bridge)
1302 {
1303         u16 pci_cmd, pci_bctl;
1304         struct pci_dev *cdev;
1305
1306         /* Program hpp values for this device */
1307         if (!(dev->hdr_type == PCI_HEADER_TYPE_NORMAL ||
1308                         (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE &&
1309                         (dev->class >> 8) == PCI_CLASS_BRIDGE_PCI)))
1310                 return;
1311
1312         if ((dev->class >> 8) == PCI_CLASS_BRIDGE_HOST)
1313                 return;
1314
1315         pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE,
1316                         bridge->hpp.t0->cache_line_size);
1317         pci_write_config_byte(dev, PCI_LATENCY_TIMER,
1318                         bridge->hpp.t0->latency_timer);
1319         pci_read_config_word(dev, PCI_COMMAND, &pci_cmd);
1320         if (bridge->hpp.t0->enable_serr)
1321                 pci_cmd |= PCI_COMMAND_SERR;
1322         else
1323                 pci_cmd &= ~PCI_COMMAND_SERR;
1324         if (bridge->hpp.t0->enable_perr)
1325                 pci_cmd |= PCI_COMMAND_PARITY;
1326         else
1327                 pci_cmd &= ~PCI_COMMAND_PARITY;
1328         pci_write_config_word(dev, PCI_COMMAND, pci_cmd);
1329
1330         /* Program bridge control value and child devices */
1331         if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
1332                 pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER,
1333                                 bridge->hpp.t0->latency_timer);
1334                 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &pci_bctl);
1335                 if (bridge->hpp.t0->enable_serr)
1336                         pci_bctl |= PCI_BRIDGE_CTL_SERR;
1337                 else
1338                         pci_bctl &= ~PCI_BRIDGE_CTL_SERR;
1339                 if (bridge->hpp.t0->enable_perr)
1340                         pci_bctl |= PCI_BRIDGE_CTL_PARITY;
1341                 else
1342                         pci_bctl &= ~PCI_BRIDGE_CTL_PARITY;
1343                 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, pci_bctl);
1344                 if (dev->subordinate) {
1345                         list_for_each_entry(cdev, &dev->subordinate->devices,
1346                                         bus_list)
1347                                 program_hpp(cdev, bridge);
1348                 }
1349         }
1350 }
1351
1352 static void acpiphp_set_hpp_values(acpi_handle handle, struct pci_bus *bus)
1353 {
1354         struct acpiphp_bridge bridge;
1355         struct pci_dev *dev;
1356
1357         memset(&bridge, 0, sizeof(bridge));
1358         bridge.handle = handle;
1359         bridge.pci_bus = bus;
1360         bridge.pci_dev = bus->self;
1361         decode_hpp(&bridge);
1362         list_for_each_entry(dev, &bus->devices, bus_list)
1363                 program_hpp(dev, &bridge);
1364
1365 }
1366
1367 /*
1368  * Remove devices for which we could not assign resources, call
1369  * arch specific code to fix-up the bus
1370  */
1371 static void acpiphp_sanitize_bus(struct pci_bus *bus)
1372 {
1373         struct pci_dev *dev;
1374         int i;
1375         unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM;
1376
1377         list_for_each_entry(dev, &bus->devices, bus_list) {
1378                 for (i=0; i<PCI_BRIDGE_RESOURCES; i++) {
1379                         struct resource *res = &dev->resource[i];
1380                         if ((res->flags & type_mask) && !res->start &&
1381                                         res->end) {
1382                                 /* Could not assign a required resources
1383                                  * for this device, remove it */
1384                                 pci_remove_bus_device(dev);
1385                                 break;
1386                         }
1387                 }
1388         }
1389 }
1390
1391 /* Program resources in newly inserted bridge */
1392 static int acpiphp_configure_bridge (acpi_handle handle)
1393 {
1394         struct acpi_pci_id pci_id;
1395         struct pci_bus *bus;
1396
1397         if (ACPI_FAILURE(acpi_get_pci_id(handle, &pci_id))) {
1398                 err("cannot get PCI domain and bus number for bridge\n");
1399                 return -EINVAL;
1400         }
1401         bus = pci_find_bus(pci_id.segment, pci_id.bus);
1402         if (!bus) {
1403                 err("cannot find bus %d:%d\n",
1404                                 pci_id.segment, pci_id.bus);
1405                 return -EINVAL;
1406         }
1407
1408         pci_bus_size_bridges(bus);
1409         pci_bus_assign_resources(bus);
1410         acpiphp_sanitize_bus(bus);
1411         acpiphp_set_hpp_values(handle, bus);
1412         pci_enable_bridges(bus);
1413         acpiphp_configure_ioapics(handle);
1414         return 0;
1415 }
1416
1417 static void handle_bridge_insertion(acpi_handle handle, u32 type)
1418 {
1419         struct acpi_device *device, *pdevice;
1420         acpi_handle phandle;
1421
1422         if ((type != ACPI_NOTIFY_BUS_CHECK) &&
1423                         (type != ACPI_NOTIFY_DEVICE_CHECK)) {
1424                 err("unexpected notification type %d\n", type);
1425                 return;
1426         }
1427
1428         acpi_get_parent(handle, &phandle);
1429         if (acpi_bus_get_device(phandle, &pdevice)) {
1430                 dbg("no parent device, assuming NULL\n");
1431                 pdevice = NULL;
1432         }
1433         if (acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE)) {
1434                 err("cannot add bridge to acpi list\n");
1435                 return;
1436         }
1437         if (!acpiphp_configure_bridge(handle) &&
1438                 !acpi_bus_start(device))
1439                 add_bridge(handle);
1440         else
1441                 err("cannot configure and start bridge\n");
1442
1443 }
1444
1445 /*
1446  * ACPI event handlers
1447  */
1448
1449 static acpi_status
1450 count_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1451 {
1452         int *count = (int *)context;
1453         struct acpiphp_bridge *bridge;
1454
1455         bridge = acpiphp_handle_to_bridge(handle);
1456         if (bridge)
1457                 (*count)++;
1458         return AE_OK ;
1459 }
1460
1461 static acpi_status
1462 check_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1463 {
1464         struct acpiphp_bridge *bridge;
1465         char objname[64];
1466         struct acpi_buffer buffer = { .length = sizeof(objname),
1467                                       .pointer = objname };
1468
1469         bridge = acpiphp_handle_to_bridge(handle);
1470         if (bridge) {
1471                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1472                 dbg("%s: re-enumerating slots under %s\n",
1473                         __func__, objname);
1474                 acpiphp_check_bridge(bridge);
1475         }
1476         return AE_OK ;
1477 }
1478
1479 /**
1480  * handle_hotplug_event_bridge - handle ACPI event on bridges
1481  * @handle: Notify()'ed acpi_handle
1482  * @type: Notify code
1483  * @context: pointer to acpiphp_bridge structure
1484  *
1485  * Handles ACPI event notification on {host,p2p} bridges.
1486  */
1487 static void handle_hotplug_event_bridge(acpi_handle handle, u32 type, void *context)
1488 {
1489         struct acpiphp_bridge *bridge;
1490         char objname[64];
1491         struct acpi_buffer buffer = { .length = sizeof(objname),
1492                                       .pointer = objname };
1493         struct acpi_device *device;
1494         int num_sub_bridges = 0;
1495
1496         if (acpi_bus_get_device(handle, &device)) {
1497                 /* This bridge must have just been physically inserted */
1498                 handle_bridge_insertion(handle, type);
1499                 return;
1500         }
1501
1502         bridge = acpiphp_handle_to_bridge(handle);
1503         if (type == ACPI_NOTIFY_BUS_CHECK) {
1504                 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, ACPI_UINT32_MAX,
1505                         count_sub_bridges, &num_sub_bridges, NULL);
1506         }
1507
1508         if (!bridge && !num_sub_bridges) {
1509                 err("cannot get bridge info\n");
1510                 return;
1511         }
1512
1513         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1514
1515         switch (type) {
1516         case ACPI_NOTIFY_BUS_CHECK:
1517                 /* bus re-enumerate */
1518                 dbg("%s: Bus check notify on %s\n", __func__, objname);
1519                 if (bridge) {
1520                         dbg("%s: re-enumerating slots under %s\n",
1521                                 __func__, objname);
1522                         acpiphp_check_bridge(bridge);
1523                 }
1524                 if (num_sub_bridges)
1525                         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
1526                                 ACPI_UINT32_MAX, check_sub_bridges, NULL, NULL);
1527                 break;
1528
1529         case ACPI_NOTIFY_DEVICE_CHECK:
1530                 /* device check */
1531                 dbg("%s: Device check notify on %s\n", __func__, objname);
1532                 acpiphp_check_bridge(bridge);
1533                 break;
1534
1535         case ACPI_NOTIFY_DEVICE_WAKE:
1536                 /* wake event */
1537                 dbg("%s: Device wake notify on %s\n", __func__, objname);
1538                 break;
1539
1540         case ACPI_NOTIFY_EJECT_REQUEST:
1541                 /* request device eject */
1542                 dbg("%s: Device eject notify on %s\n", __func__, objname);
1543                 if ((bridge->type != BRIDGE_TYPE_HOST) &&
1544                     (bridge->flags & BRIDGE_HAS_EJ0)) {
1545                         struct acpiphp_slot *slot;
1546                         slot = bridge->func->slot;
1547                         if (!acpiphp_disable_slot(slot))
1548                                 acpiphp_eject_slot(slot);
1549                 }
1550                 break;
1551
1552         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
1553                 printk(KERN_ERR "Device %s cannot be configured due"
1554                                 " to a frequency mismatch\n", objname);
1555                 break;
1556
1557         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
1558                 printk(KERN_ERR "Device %s cannot be configured due"
1559                                 " to a bus mode mismatch\n", objname);
1560                 break;
1561
1562         case ACPI_NOTIFY_POWER_FAULT:
1563                 printk(KERN_ERR "Device %s has suffered a power fault\n",
1564                                 objname);
1565                 break;
1566
1567         default:
1568                 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
1569                 break;
1570         }
1571 }
1572
1573 /**
1574  * handle_hotplug_event_func - handle ACPI event on functions (i.e. slots)
1575  * @handle: Notify()'ed acpi_handle
1576  * @type: Notify code
1577  * @context: pointer to acpiphp_func structure
1578  *
1579  * Handles ACPI event notification on slots.
1580  */
1581 static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context)
1582 {
1583         struct acpiphp_func *func;
1584         char objname[64];
1585         struct acpi_buffer buffer = { .length = sizeof(objname),
1586                                       .pointer = objname };
1587
1588         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1589
1590         func = (struct acpiphp_func *)context;
1591
1592         switch (type) {
1593         case ACPI_NOTIFY_BUS_CHECK:
1594                 /* bus re-enumerate */
1595                 dbg("%s: Bus check notify on %s\n", __func__, objname);
1596                 acpiphp_enable_slot(func->slot);
1597                 break;
1598
1599         case ACPI_NOTIFY_DEVICE_CHECK:
1600                 /* device check : re-enumerate from parent bus */
1601                 dbg("%s: Device check notify on %s\n", __func__, objname);
1602                 acpiphp_check_bridge(func->slot->bridge);
1603                 break;
1604
1605         case ACPI_NOTIFY_DEVICE_WAKE:
1606                 /* wake event */
1607                 dbg("%s: Device wake notify on %s\n", __func__, objname);
1608                 break;
1609
1610         case ACPI_NOTIFY_EJECT_REQUEST:
1611                 /* request device eject */
1612                 dbg("%s: Device eject notify on %s\n", __func__, objname);
1613                 if (!(acpiphp_disable_slot(func->slot)))
1614                         acpiphp_eject_slot(func->slot);
1615                 break;
1616
1617         default:
1618                 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
1619                 break;
1620         }
1621 }
1622
1623
1624 static acpi_status
1625 find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1626 {
1627         int *count = (int *)context;
1628
1629         if (acpi_root_bridge(handle)) {
1630                 acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
1631                                 handle_hotplug_event_bridge, NULL);
1632                         (*count)++;
1633         }
1634         return AE_OK ;
1635 }
1636
1637 static struct acpi_pci_driver acpi_pci_hp_driver = {
1638         .add =          add_bridge,
1639         .remove =       remove_bridge,
1640 };
1641
1642 /**
1643  * acpiphp_glue_init - initializes all PCI hotplug - ACPI glue data structures
1644  */
1645 int __init acpiphp_glue_init(void)
1646 {
1647         int num = 0;
1648
1649         acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
1650                         ACPI_UINT32_MAX, find_root_bridges, &num, NULL);
1651
1652         if (num <= 0)
1653                 return -1;
1654         else
1655                 acpi_pci_register_driver(&acpi_pci_hp_driver);
1656
1657         return 0;
1658 }
1659
1660
1661 /**
1662  * acpiphp_glue_exit - terminates all PCI hotplug - ACPI glue data structures
1663  *
1664  * This function frees all data allocated in acpiphp_glue_init().
1665  */
1666 void  acpiphp_glue_exit(void)
1667 {
1668         acpi_pci_unregister_driver(&acpi_pci_hp_driver);
1669 }
1670
1671
1672 /**
1673  * acpiphp_get_num_slots - count number of slots in a system
1674  */
1675 int __init acpiphp_get_num_slots(void)
1676 {
1677         struct acpiphp_bridge *bridge;
1678         int num_slots = 0;
1679
1680         list_for_each_entry (bridge, &bridge_list, list) {
1681                 dbg("Bus %04x:%02x has %d slot%s\n",
1682                                 pci_domain_nr(bridge->pci_bus),
1683                                 bridge->pci_bus->number, bridge->nr_slots,
1684                                 bridge->nr_slots == 1 ? "" : "s");
1685                 num_slots += bridge->nr_slots;
1686         }
1687
1688         dbg("Total %d slots\n", num_slots);
1689         return num_slots;
1690 }
1691
1692
1693 #if 0
1694 /**
1695  * acpiphp_for_each_slot - call function for each slot
1696  * @fn: callback function
1697  * @data: context to be passed to callback function
1698  */
1699 static int acpiphp_for_each_slot(acpiphp_callback fn, void *data)
1700 {
1701         struct list_head *node;
1702         struct acpiphp_bridge *bridge;
1703         struct acpiphp_slot *slot;
1704         int retval = 0;
1705
1706         list_for_each (node, &bridge_list) {
1707                 bridge = (struct acpiphp_bridge *)node;
1708                 for (slot = bridge->slots; slot; slot = slot->next) {
1709                         retval = fn(slot, data);
1710                         if (!retval)
1711                                 goto err_exit;
1712                 }
1713         }
1714
1715  err_exit:
1716         return retval;
1717 }
1718 #endif
1719
1720
1721 /**
1722  * acpiphp_enable_slot - power on slot
1723  * @slot: ACPI PHP slot
1724  */
1725 int acpiphp_enable_slot(struct acpiphp_slot *slot)
1726 {
1727         int retval;
1728
1729         mutex_lock(&slot->crit_sect);
1730
1731         /* wake up all functions */
1732         retval = power_on_slot(slot);
1733         if (retval)
1734                 goto err_exit;
1735
1736         if (get_slot_status(slot) == ACPI_STA_ALL) {
1737                 /* configure all functions */
1738                 retval = enable_device(slot);
1739                 if (retval)
1740                         power_off_slot(slot);
1741         } else {
1742                 dbg("%s: Slot status is not ACPI_STA_ALL\n", __func__);
1743                 power_off_slot(slot);
1744         }
1745
1746  err_exit:
1747         mutex_unlock(&slot->crit_sect);
1748         return retval;
1749 }
1750
1751 /**
1752  * acpiphp_disable_slot - power off slot
1753  * @slot: ACPI PHP slot
1754  */
1755 int acpiphp_disable_slot(struct acpiphp_slot *slot)
1756 {
1757         int retval = 0;
1758
1759         mutex_lock(&slot->crit_sect);
1760
1761         /* unconfigure all functions */
1762         retval = disable_device(slot);
1763         if (retval)
1764                 goto err_exit;
1765
1766         /* power off all functions */
1767         retval = power_off_slot(slot);
1768         if (retval)
1769                 goto err_exit;
1770
1771  err_exit:
1772         mutex_unlock(&slot->crit_sect);
1773         return retval;
1774 }
1775
1776
1777 /*
1778  * slot enabled:  1
1779  * slot disabled: 0
1780  */
1781 u8 acpiphp_get_power_status(struct acpiphp_slot *slot)
1782 {
1783         return (slot->flags & SLOT_POWEREDON);
1784 }
1785
1786
1787 /*
1788  * latch   open:  1
1789  * latch closed:  0
1790  */
1791 u8 acpiphp_get_latch_status(struct acpiphp_slot *slot)
1792 {
1793         unsigned int sta;
1794
1795         sta = get_slot_status(slot);
1796
1797         return (sta & ACPI_STA_SHOW_IN_UI) ? 0 : 1;
1798 }
1799
1800
1801 /*
1802  * adapter presence : 1
1803  *          absence : 0
1804  */
1805 u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot)
1806 {
1807         unsigned int sta;
1808
1809         sta = get_slot_status(slot);
1810
1811         return (sta == 0) ? 0 : 1;
1812 }