2 * ACPI PCI HotPlug glue functions to ACPI CA subsystem
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
12 * All rights reserved.
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.
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
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.
29 * Send feedback to <t-kochi@bq.jp.nec.com>
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
43 #include <linux/init.h>
44 #include <linux/module.h>
46 #include <linux/kernel.h>
47 #include <linux/pci.h>
48 #include <linux/smp_lock.h>
49 #include <linux/mutex.h>
52 #include "pci_hotplug.h"
55 static LIST_HEAD(bridge_list
);
57 #define MY_NAME "acpiphp_glue"
59 static void handle_hotplug_event_bridge (acpi_handle
, u32
, void *);
60 static void acpiphp_sanitize_bus(struct pci_bus
*bus
);
61 static void acpiphp_set_hpp_values(acpi_handle handle
, struct pci_bus
*bus
);
65 * initialization & terminatation routines
69 * is_ejectable - determine if a slot is ejectable
70 * @handle: handle to acpi namespace
72 * Ejectable slot should satisfy at least these conditions:
85 static int is_ejectable(acpi_handle handle
)
90 status
= acpi_get_handle(handle
, "_ADR", &tmp
);
91 if (ACPI_FAILURE(status
)) {
95 status
= acpi_get_handle(handle
, "_EJ0", &tmp
);
96 if (ACPI_FAILURE(status
)) {
104 /* callback routine to check the existence of ejectable slots */
106 is_ejectable_slot(acpi_handle handle
, u32 lvl
, void *context
, void **rv
)
108 int *count
= (int *)context
;
110 if (is_ejectable(handle
)) {
112 /* only one ejectable slot is enough */
113 return AE_CTRL_TERMINATE
;
120 /* callback routine to register each ACPI PCI slot object */
122 register_slot(acpi_handle handle
, u32 lvl
, void *context
, void **rv
)
124 struct acpiphp_bridge
*bridge
= (struct acpiphp_bridge
*)context
;
125 struct acpiphp_slot
*slot
;
126 struct acpiphp_func
*newfunc
;
127 struct dependent_device
*dd
;
129 acpi_status status
= AE_OK
;
130 unsigned long adr
, sun
;
131 int device
, function
, retval
;
133 status
= acpi_evaluate_integer(handle
, "_ADR", NULL
, &adr
);
135 if (ACPI_FAILURE(status
))
138 status
= acpi_get_handle(handle
, "_EJ0", &tmp
);
140 if (ACPI_FAILURE(status
) && !(is_dependent_device(handle
)))
143 device
= (adr
>> 16) & 0xffff;
144 function
= adr
& 0xffff;
146 newfunc
= kzalloc(sizeof(struct acpiphp_func
), GFP_KERNEL
);
150 INIT_LIST_HEAD(&newfunc
->sibling
);
151 newfunc
->handle
= handle
;
152 newfunc
->function
= function
;
153 if (ACPI_SUCCESS(status
))
154 newfunc
->flags
= FUNC_HAS_EJ0
;
156 if (ACPI_SUCCESS(acpi_get_handle(handle
, "_STA", &tmp
)))
157 newfunc
->flags
|= FUNC_HAS_STA
;
159 if (ACPI_SUCCESS(acpi_get_handle(handle
, "_PS0", &tmp
)))
160 newfunc
->flags
|= FUNC_HAS_PS0
;
162 if (ACPI_SUCCESS(acpi_get_handle(handle
, "_PS3", &tmp
)))
163 newfunc
->flags
|= FUNC_HAS_PS3
;
165 if (ACPI_SUCCESS(acpi_get_handle(handle
, "_DCK", &tmp
))) {
166 newfunc
->flags
|= FUNC_HAS_DCK
;
167 /* add to devices dependent on dock station,
168 * because this may actually be the dock bridge
170 dd
= alloc_dependent_device(handle
);
172 err("Can't allocate memory for "
173 "new dependent device!\n");
175 add_dependent_device(dd
);
178 status
= acpi_evaluate_integer(handle
, "_SUN", NULL
, &sun
);
179 if (ACPI_FAILURE(status
))
182 /* search for objects that share the same slot */
183 for (slot
= bridge
->slots
; slot
; slot
= slot
->next
)
184 if (slot
->device
== device
) {
185 if (slot
->sun
!= sun
)
186 warn("sibling found, but _SUN doesn't match!\n");
191 slot
= kzalloc(sizeof(struct acpiphp_slot
), GFP_KERNEL
);
197 slot
->bridge
= bridge
;
198 slot
->device
= device
;
200 INIT_LIST_HEAD(&slot
->funcs
);
201 mutex_init(&slot
->crit_sect
);
203 slot
->next
= bridge
->slots
;
204 bridge
->slots
= slot
;
208 dbg("found ACPI PCI Hotplug slot %d at PCI %04x:%02x:%02x\n",
209 slot
->sun
, pci_domain_nr(bridge
->pci_bus
),
210 bridge
->pci_bus
->number
, slot
->device
);
211 retval
= acpiphp_register_hotplug_slot(slot
);
213 warn("acpiphp_register_hotplug_slot failed(err code = 0x%x)\n", retval
);
218 newfunc
->slot
= slot
;
219 list_add_tail(&newfunc
->sibling
, &slot
->funcs
);
221 /* associate corresponding pci_dev */
222 newfunc
->pci_dev
= pci_get_slot(bridge
->pci_bus
,
223 PCI_DEVFN(device
, function
));
224 if (newfunc
->pci_dev
) {
225 slot
->flags
|= (SLOT_ENABLED
| SLOT_POWEREDON
);
228 /* if this is a device dependent on a dock station,
229 * associate the acpiphp_func to the dependent_device
232 if ((dd
= get_dependent_device(handle
))) {
233 newfunc
->flags
|= FUNC_IS_DD
;
235 * we don't want any devices which is dependent
236 * on the dock to have it's _EJ0 method executed.
237 * because we need to run _DCK first.
239 newfunc
->flags
&= ~FUNC_HAS_EJ0
;
241 add_pci_dependent_device(dd
);
244 /* install notify handler */
245 if (!(newfunc
->flags
& FUNC_HAS_DCK
)) {
246 status
= acpi_install_notify_handler(handle
,
248 handle_hotplug_event_func
,
251 if (ACPI_FAILURE(status
))
252 err("failed to register interrupt notify handler\n");
260 bridge
->slots
= slot
->next
;
268 /* see if it's worth looking at this bridge */
269 static int detect_ejectable_slots(acpi_handle
*bridge_handle
)
276 /* only check slots defined directly below bridge object */
277 status
= acpi_walk_namespace(ACPI_TYPE_DEVICE
, bridge_handle
, (u32
)1,
278 is_ejectable_slot
, (void *)&count
, NULL
);
284 /* decode ACPI 2.0 _HPP hot plug parameters */
285 static void decode_hpp(struct acpiphp_bridge
*bridge
)
289 status
= acpi_get_hp_params_from_firmware(bridge
->pci_bus
, &bridge
->hpp
);
290 if (ACPI_FAILURE(status
)) {
291 /* use default numbers */
292 bridge
->hpp
.cache_line_size
= 0x10;
293 bridge
->hpp
.latency_timer
= 0x40;
294 bridge
->hpp
.enable_serr
= 0;
295 bridge
->hpp
.enable_perr
= 0;
301 /* initialize miscellaneous stuff for both root and PCI-to-PCI bridge */
302 static void init_bridge_misc(struct acpiphp_bridge
*bridge
)
306 /* decode ACPI 2.0 _HPP (hot plug parameters) */
309 /* must be added to the list prior to calling register_slot */
310 list_add(&bridge
->list
, &bridge_list
);
312 /* register all slot objects under this bridge */
313 status
= acpi_walk_namespace(ACPI_TYPE_DEVICE
, bridge
->handle
, (u32
)1,
314 register_slot
, bridge
, NULL
);
315 if (ACPI_FAILURE(status
)) {
316 list_del(&bridge
->list
);
320 /* install notify handler */
321 if (bridge
->type
!= BRIDGE_TYPE_HOST
) {
322 if ((bridge
->flags
& BRIDGE_HAS_EJ0
) && bridge
->func
) {
323 status
= acpi_remove_notify_handler(bridge
->func
->handle
,
325 handle_hotplug_event_func
);
326 if (ACPI_FAILURE(status
))
327 err("failed to remove notify handler\n");
329 status
= acpi_install_notify_handler(bridge
->handle
,
331 handle_hotplug_event_bridge
,
334 if (ACPI_FAILURE(status
)) {
335 err("failed to register interrupt notify handler\n");
341 /* find acpiphp_func from acpiphp_bridge */
342 static struct acpiphp_func
*acpiphp_bridge_handle_to_function(acpi_handle handle
)
344 struct list_head
*node
, *l
;
345 struct acpiphp_bridge
*bridge
;
346 struct acpiphp_slot
*slot
;
347 struct acpiphp_func
*func
;
349 list_for_each(node
, &bridge_list
) {
350 bridge
= list_entry(node
, struct acpiphp_bridge
, list
);
351 for (slot
= bridge
->slots
; slot
; slot
= slot
->next
) {
352 list_for_each(l
, &slot
->funcs
) {
353 func
= list_entry(l
, struct acpiphp_func
,
355 if (func
->handle
== handle
)
365 static inline void config_p2p_bridge_flags(struct acpiphp_bridge
*bridge
)
367 acpi_handle dummy_handle
;
369 if (ACPI_SUCCESS(acpi_get_handle(bridge
->handle
,
370 "_STA", &dummy_handle
)))
371 bridge
->flags
|= BRIDGE_HAS_STA
;
373 if (ACPI_SUCCESS(acpi_get_handle(bridge
->handle
,
374 "_EJ0", &dummy_handle
)))
375 bridge
->flags
|= BRIDGE_HAS_EJ0
;
377 if (ACPI_SUCCESS(acpi_get_handle(bridge
->handle
,
378 "_PS0", &dummy_handle
)))
379 bridge
->flags
|= BRIDGE_HAS_PS0
;
381 if (ACPI_SUCCESS(acpi_get_handle(bridge
->handle
,
382 "_PS3", &dummy_handle
)))
383 bridge
->flags
|= BRIDGE_HAS_PS3
;
385 /* is this ejectable p2p bridge? */
386 if (bridge
->flags
& BRIDGE_HAS_EJ0
) {
387 struct acpiphp_func
*func
;
389 dbg("found ejectable p2p bridge\n");
391 /* make link between PCI bridge and PCI function */
392 func
= acpiphp_bridge_handle_to_function(bridge
->handle
);
396 func
->bridge
= bridge
;
401 /* allocate and initialize host bridge data structure */
402 static void add_host_bridge(acpi_handle
*handle
, struct pci_bus
*pci_bus
)
404 struct acpiphp_bridge
*bridge
;
406 bridge
= kzalloc(sizeof(struct acpiphp_bridge
), GFP_KERNEL
);
410 bridge
->type
= BRIDGE_TYPE_HOST
;
411 bridge
->handle
= handle
;
413 bridge
->pci_bus
= pci_bus
;
415 spin_lock_init(&bridge
->res_lock
);
417 init_bridge_misc(bridge
);
421 /* allocate and initialize PCI-to-PCI bridge data structure */
422 static void add_p2p_bridge(acpi_handle
*handle
, struct pci_dev
*pci_dev
)
424 struct acpiphp_bridge
*bridge
;
426 bridge
= kzalloc(sizeof(struct acpiphp_bridge
), GFP_KERNEL
);
427 if (bridge
== NULL
) {
428 err("out of memory\n");
432 bridge
->type
= BRIDGE_TYPE_P2P
;
433 bridge
->handle
= handle
;
434 config_p2p_bridge_flags(bridge
);
436 bridge
->pci_dev
= pci_dev_get(pci_dev
);
437 bridge
->pci_bus
= pci_dev
->subordinate
;
438 if (!bridge
->pci_bus
) {
439 err("This is not a PCI-to-PCI bridge!\n");
443 spin_lock_init(&bridge
->res_lock
);
445 init_bridge_misc(bridge
);
448 pci_dev_put(pci_dev
);
454 /* callback routine to find P2P bridges */
456 find_p2p_bridge(acpi_handle handle
, u32 lvl
, void *context
, void **rv
)
459 acpi_handle dummy_handle
;
461 int device
, function
;
463 struct pci_bus
*pci_bus
= context
;
465 status
= acpi_get_handle(handle
, "_ADR", &dummy_handle
);
466 if (ACPI_FAILURE(status
))
467 return AE_OK
; /* continue */
469 status
= acpi_evaluate_integer(handle
, "_ADR", NULL
, &tmp
);
470 if (ACPI_FAILURE(status
)) {
471 dbg("%s: _ADR evaluation failure\n", __FUNCTION__
);
475 device
= (tmp
>> 16) & 0xffff;
476 function
= tmp
& 0xffff;
478 dev
= pci_get_slot(pci_bus
, PCI_DEVFN(device
, function
));
480 if (!dev
|| !dev
->subordinate
)
483 /* check if this bridge has ejectable slots */
484 if ((detect_ejectable_slots(handle
) > 0) ||
485 (detect_dependent_devices(handle
) > 0)) {
486 dbg("found PCI-to-PCI bridge at PCI %s\n", pci_name(dev
));
487 add_p2p_bridge(handle
, dev
);
490 /* search P2P bridges under this p2p bridge */
491 status
= acpi_walk_namespace(ACPI_TYPE_DEVICE
, handle
, (u32
)1,
492 find_p2p_bridge
, dev
->subordinate
, NULL
);
493 if (ACPI_FAILURE(status
))
494 warn("find_p2p_bridge failed (error code = 0x%x)\n", status
);
502 /* find hot-pluggable slots, and then find P2P bridge */
503 static int add_bridge(acpi_handle handle
)
508 acpi_handle dummy_handle
;
509 struct pci_bus
*pci_bus
;
511 /* if the bridge doesn't have _STA, we assume it is always there */
512 status
= acpi_get_handle(handle
, "_STA", &dummy_handle
);
513 if (ACPI_SUCCESS(status
)) {
514 status
= acpi_evaluate_integer(handle
, "_STA", NULL
, &tmp
);
515 if (ACPI_FAILURE(status
)) {
516 dbg("%s: _STA evaluation failure\n", __FUNCTION__
);
519 if ((tmp
& ACPI_STA_FUNCTIONING
) == 0)
520 /* don't register this object */
524 /* get PCI segment number */
525 status
= acpi_evaluate_integer(handle
, "_SEG", NULL
, &tmp
);
527 seg
= ACPI_SUCCESS(status
) ? tmp
: 0;
529 /* get PCI bus number */
530 status
= acpi_evaluate_integer(handle
, "_BBN", NULL
, &tmp
);
532 if (ACPI_SUCCESS(status
)) {
535 warn("can't get bus number, assuming 0\n");
539 pci_bus
= pci_find_bus(seg
, bus
);
541 err("Can't find bus %04x:%02x\n", seg
, bus
);
545 /* check if this bridge has ejectable slots */
546 if (detect_ejectable_slots(handle
) > 0) {
547 dbg("found PCI host-bus bridge with hot-pluggable slots\n");
548 add_host_bridge(handle
, pci_bus
);
551 /* search P2P bridges under this host bridge */
552 status
= acpi_walk_namespace(ACPI_TYPE_DEVICE
, handle
, (u32
)1,
553 find_p2p_bridge
, pci_bus
, NULL
);
555 if (ACPI_FAILURE(status
))
556 warn("find_p2p_bridge failed (error code = 0x%x)\n", status
);
561 static struct acpiphp_bridge
*acpiphp_handle_to_bridge(acpi_handle handle
)
563 struct list_head
*head
;
564 list_for_each(head
, &bridge_list
) {
565 struct acpiphp_bridge
*bridge
= list_entry(head
,
566 struct acpiphp_bridge
, list
);
567 if (bridge
->handle
== handle
)
574 static void cleanup_bridge(struct acpiphp_bridge
*bridge
)
576 struct list_head
*list
, *tmp
;
577 struct acpiphp_slot
*slot
;
579 acpi_handle handle
= bridge
->handle
;
581 status
= acpi_remove_notify_handler(handle
, ACPI_SYSTEM_NOTIFY
,
582 handle_hotplug_event_bridge
);
583 if (ACPI_FAILURE(status
))
584 err("failed to remove notify handler\n");
586 if ((bridge
->type
!= BRIDGE_TYPE_HOST
) &&
587 ((bridge
->flags
& BRIDGE_HAS_EJ0
) && bridge
->func
)) {
588 status
= acpi_install_notify_handler(bridge
->func
->handle
,
590 handle_hotplug_event_func
,
592 if (ACPI_FAILURE(status
))
593 err("failed to install interrupt notify handler\n");
596 slot
= bridge
->slots
;
598 struct acpiphp_slot
*next
= slot
->next
;
599 list_for_each_safe (list
, tmp
, &slot
->funcs
) {
600 struct acpiphp_func
*func
;
601 func
= list_entry(list
, struct acpiphp_func
, sibling
);
602 if (!(func
->flags
& FUNC_HAS_DCK
)) {
603 status
= acpi_remove_notify_handler(func
->handle
,
605 handle_hotplug_event_func
);
606 if (ACPI_FAILURE(status
))
607 err("failed to remove notify handler\n");
609 pci_dev_put(func
->pci_dev
);
613 acpiphp_unregister_hotplug_slot(slot
);
614 list_del(&slot
->funcs
);
619 pci_dev_put(bridge
->pci_dev
);
620 list_del(&bridge
->list
);
625 cleanup_p2p_bridge(acpi_handle handle
, u32 lvl
, void *context
, void **rv
)
627 struct acpiphp_bridge
*bridge
;
629 /* cleanup p2p bridges under this P2P bridge
630 in a depth-first manner */
631 acpi_walk_namespace(ACPI_TYPE_DEVICE
, handle
, (u32
)1,
632 cleanup_p2p_bridge
, NULL
, NULL
);
634 if (!(bridge
= acpiphp_handle_to_bridge(handle
)))
636 cleanup_bridge(bridge
);
640 static void remove_bridge(acpi_handle handle
)
642 struct acpiphp_bridge
*bridge
;
644 /* cleanup p2p bridges under this host bridge
645 in a depth-first manner */
646 acpi_walk_namespace(ACPI_TYPE_DEVICE
, handle
,
647 (u32
)1, cleanup_p2p_bridge
, NULL
, NULL
);
649 bridge
= acpiphp_handle_to_bridge(handle
);
651 cleanup_bridge(bridge
);
654 static struct pci_dev
* get_apic_pci_info(acpi_handle handle
)
656 struct acpi_pci_id id
;
660 if (ACPI_FAILURE(acpi_get_pci_id(handle
, &id
)))
663 bus
= pci_find_bus(id
.segment
, id
.bus
);
667 dev
= pci_get_slot(bus
, PCI_DEVFN(id
.device
, id
.function
));
671 if ((dev
->class != PCI_CLASS_SYSTEM_PIC_IOAPIC
) &&
672 (dev
->class != PCI_CLASS_SYSTEM_PIC_IOXAPIC
))
681 static int get_gsi_base(acpi_handle handle
, u32
*gsi_base
)
686 struct acpi_buffer buffer
= {ACPI_ALLOCATE_BUFFER
, NULL
};
687 union acpi_object
*obj
;
690 status
= acpi_evaluate_integer(handle
, "_GSB", NULL
, &gsb
);
691 if (ACPI_SUCCESS(status
)) {
692 *gsi_base
= (u32
)gsb
;
696 status
= acpi_evaluate_object(handle
, "_MAT", NULL
, &buffer
);
697 if (ACPI_FAILURE(status
) || !buffer
.length
|| !buffer
.pointer
)
700 obj
= buffer
.pointer
;
701 if (obj
->type
!= ACPI_TYPE_BUFFER
)
704 table
= obj
->buffer
.pointer
;
705 switch (((acpi_table_entry_header
*)table
)->type
) {
706 case ACPI_MADT_IOSAPIC
:
707 *gsi_base
= ((struct acpi_table_iosapic
*)table
)->global_irq_base
;
710 case ACPI_MADT_IOAPIC
:
711 *gsi_base
= ((struct acpi_table_ioapic
*)table
)->global_irq_base
;
718 kfree(buffer
.pointer
);
723 ioapic_add(acpi_handle handle
, u32 lvl
, void *context
, void **rv
)
728 struct pci_dev
*pdev
;
732 /* Evaluate _STA if present */
733 status
= acpi_evaluate_integer(handle
, "_STA", NULL
, &sta
);
734 if (ACPI_SUCCESS(status
) && sta
!= ACPI_STA_ALL
)
735 return AE_CTRL_DEPTH
;
737 /* Scan only PCI bus scope */
738 status
= acpi_get_handle(handle
, "_HID", &tmp
);
739 if (ACPI_SUCCESS(status
))
740 return AE_CTRL_DEPTH
;
742 if (get_gsi_base(handle
, &gsi_base
))
745 pdev
= get_apic_pci_info(handle
);
749 if (pci_enable_device(pdev
)) {
754 pci_set_master(pdev
);
756 if (pci_request_region(pdev
, 0, "I/O APIC(acpiphp)")) {
757 pci_disable_device(pdev
);
762 phys_addr
= pci_resource_start(pdev
, 0);
763 if (acpi_register_ioapic(handle
, phys_addr
, gsi_base
)) {
764 pci_release_region(pdev
, 0);
765 pci_disable_device(pdev
);
773 static int acpiphp_configure_ioapics(acpi_handle handle
)
775 acpi_walk_namespace(ACPI_TYPE_DEVICE
, handle
,
776 ACPI_UINT32_MAX
, ioapic_add
, NULL
, NULL
);
780 static int power_on_slot(struct acpiphp_slot
*slot
)
783 struct acpiphp_func
*func
;
787 /* if already enabled, just skip */
788 if (slot
->flags
& SLOT_POWEREDON
)
791 list_for_each (l
, &slot
->funcs
) {
792 func
= list_entry(l
, struct acpiphp_func
, sibling
);
794 if (func
->flags
& FUNC_HAS_PS0
) {
795 dbg("%s: executing _PS0\n", __FUNCTION__
);
796 status
= acpi_evaluate_object(func
->handle
, "_PS0", NULL
, NULL
);
797 if (ACPI_FAILURE(status
)) {
798 warn("%s: _PS0 failed\n", __FUNCTION__
);
806 /* TBD: evaluate _STA to check if the slot is enabled */
808 slot
->flags
|= SLOT_POWEREDON
;
815 static int power_off_slot(struct acpiphp_slot
*slot
)
818 struct acpiphp_func
*func
;
823 /* if already disabled, just skip */
824 if ((slot
->flags
& SLOT_POWEREDON
) == 0)
827 list_for_each (l
, &slot
->funcs
) {
828 func
= list_entry(l
, struct acpiphp_func
, sibling
);
830 if (func
->flags
& FUNC_HAS_PS3
) {
831 status
= acpi_evaluate_object(func
->handle
, "_PS3", NULL
, NULL
);
832 if (ACPI_FAILURE(status
)) {
833 warn("%s: _PS3 failed\n", __FUNCTION__
);
841 /* TBD: evaluate _STA to check if the slot is disabled */
843 slot
->flags
&= (~SLOT_POWEREDON
);
852 * acpiphp_max_busnr - return the highest reserved bus number under
854 * @bus: bus to start search with
857 static unsigned char acpiphp_max_busnr(struct pci_bus
*bus
)
859 struct list_head
*tmp
;
860 unsigned char max
, n
;
863 * pci_bus_max_busnr will return the highest
864 * reserved busnr for all these children.
865 * that is equivalent to the bus->subordinate
866 * value. We don't want to use the parent's
867 * bus->subordinate value because it could have
870 max
= bus
->secondary
;
872 list_for_each(tmp
, &bus
->children
) {
873 n
= pci_bus_max_busnr(pci_bus_b(tmp
));
882 * acpiphp_bus_add - add a new bus to acpi subsystem
883 * @func: acpiphp_func of the bridge
886 static int acpiphp_bus_add(struct acpiphp_func
*func
)
889 struct acpi_device
*device
, *pdevice
;
892 acpi_get_parent(func
->handle
, &phandle
);
893 if (acpi_bus_get_device(phandle
, &pdevice
)) {
894 dbg("no parent device, assuming NULL\n");
897 if (!acpi_bus_get_device(func
->handle
, &device
)) {
898 dbg("bus exists... trim\n");
899 /* this shouldn't be in here, so remove
900 * the bus then re-add it...
902 ret_val
= acpi_bus_trim(device
, 1);
903 dbg("acpi_bus_trim return %x\n", ret_val
);
906 ret_val
= acpi_bus_add(&device
, pdevice
, func
->handle
,
907 ACPI_BUS_TYPE_DEVICE
);
909 dbg("error adding bus, %x\n",
911 goto acpiphp_bus_add_out
;
914 * try to start anyway. We could have failed to add
915 * simply because this bus had previously been added
916 * on another add. Don't bother with the return value
917 * we just keep going.
919 ret_val
= acpi_bus_start(device
);
927 * acpiphp_bus_trim - trim a bus from acpi subsystem
928 * @handle: handle to acpi namespace
931 int acpiphp_bus_trim(acpi_handle handle
)
933 struct acpi_device
*device
;
936 retval
= acpi_bus_get_device(handle
, &device
);
938 dbg("acpi_device not found\n");
942 retval
= acpi_bus_trim(device
, 1);
944 err("cannot remove from acpi list\n");
950 * enable_device - enable, configure a slot
951 * @slot: slot to be enabled
953 * This function should be called per *physical slot*,
954 * not per each slot object in ACPI namespace.
957 static int enable_device(struct acpiphp_slot
*slot
)
960 struct pci_bus
*bus
= slot
->bridge
->pci_bus
;
962 struct acpiphp_func
*func
;
967 if (slot
->flags
& SLOT_ENABLED
)
970 /* sanity check: dev should be NULL when hot-plugged in */
971 dev
= pci_get_slot(bus
, PCI_DEVFN(slot
->device
, 0));
973 /* This case shouldn't happen */
974 err("pci_dev structure already exists.\n");
980 num
= pci_scan_slot(bus
, PCI_DEVFN(slot
->device
, 0));
982 err("No new device found\n");
987 max
= acpiphp_max_busnr(bus
);
988 for (pass
= 0; pass
< 2; pass
++) {
989 list_for_each_entry(dev
, &bus
->devices
, bus_list
) {
990 if (PCI_SLOT(dev
->devfn
) != slot
->device
)
992 if (dev
->hdr_type
== PCI_HEADER_TYPE_BRIDGE
||
993 dev
->hdr_type
== PCI_HEADER_TYPE_CARDBUS
) {
994 max
= pci_scan_bridge(bus
, dev
, max
, pass
);
995 if (pass
&& dev
->subordinate
)
996 pci_bus_size_bridges(dev
->subordinate
);
1001 list_for_each (l
, &slot
->funcs
) {
1002 func
= list_entry(l
, struct acpiphp_func
, sibling
);
1003 acpiphp_bus_add(func
);
1006 pci_bus_assign_resources(bus
);
1007 acpiphp_sanitize_bus(bus
);
1008 pci_enable_bridges(bus
);
1009 pci_bus_add_devices(bus
);
1010 acpiphp_set_hpp_values(slot
->bridge
->handle
, bus
);
1011 acpiphp_configure_ioapics(slot
->bridge
->handle
);
1013 /* associate pci_dev to our representation */
1014 list_for_each (l
, &slot
->funcs
) {
1015 func
= list_entry(l
, struct acpiphp_func
, sibling
);
1016 func
->pci_dev
= pci_get_slot(bus
, PCI_DEVFN(slot
->device
,
1021 if (func
->pci_dev
->hdr_type
!= PCI_HEADER_TYPE_BRIDGE
&&
1022 func
->pci_dev
->hdr_type
!= PCI_HEADER_TYPE_CARDBUS
)
1025 status
= find_p2p_bridge(func
->handle
, (u32
)1, bus
, NULL
);
1026 if (ACPI_FAILURE(status
))
1027 warn("find_p2p_bridge failed (error code = 0x%x)\n",
1031 slot
->flags
|= SLOT_ENABLED
;
1039 * disable_device - disable a slot
1041 static int disable_device(struct acpiphp_slot
*slot
)
1044 struct acpiphp_func
*func
;
1045 struct list_head
*l
;
1047 /* is this slot already disabled? */
1048 if (!(slot
->flags
& SLOT_ENABLED
))
1051 list_for_each (l
, &slot
->funcs
) {
1052 func
= list_entry(l
, struct acpiphp_func
, sibling
);
1055 /* cleanup p2p bridges under this P2P bridge */
1056 cleanup_p2p_bridge(func
->bridge
->handle
,
1057 (u32
)1, NULL
, NULL
);
1058 func
->bridge
= NULL
;
1061 acpiphp_bus_trim(func
->handle
);
1062 /* try to remove anyway.
1063 * acpiphp_bus_add might have been failed */
1068 pci_remove_bus_device(func
->pci_dev
);
1069 pci_dev_put(func
->pci_dev
);
1070 func
->pci_dev
= NULL
;
1073 slot
->flags
&= (~SLOT_ENABLED
);
1081 * get_slot_status - get ACPI slot status
1083 * if a slot has _STA for each function and if any one of them
1084 * returned non-zero status, return it
1086 * if a slot doesn't have _STA and if any one of its functions'
1087 * configuration space is configured, return 0x0f as a _STA
1089 * otherwise return 0
1091 static unsigned int get_slot_status(struct acpiphp_slot
*slot
)
1094 unsigned long sta
= 0;
1096 struct list_head
*l
;
1097 struct acpiphp_func
*func
;
1099 list_for_each (l
, &slot
->funcs
) {
1100 func
= list_entry(l
, struct acpiphp_func
, sibling
);
1102 if (func
->flags
& FUNC_HAS_STA
) {
1103 status
= acpi_evaluate_integer(func
->handle
, "_STA", NULL
, &sta
);
1104 if (ACPI_SUCCESS(status
) && sta
)
1107 pci_bus_read_config_dword(slot
->bridge
->pci_bus
,
1108 PCI_DEVFN(slot
->device
,
1110 PCI_VENDOR_ID
, &dvid
);
1111 if (dvid
!= 0xffffffff) {
1118 return (unsigned int)sta
;
1122 * acpiphp_eject_slot - physically eject the slot
1124 static int acpiphp_eject_slot(struct acpiphp_slot
*slot
)
1127 struct acpiphp_func
*func
;
1128 struct list_head
*l
;
1129 struct acpi_object_list arg_list
;
1130 union acpi_object arg
;
1132 list_for_each (l
, &slot
->funcs
) {
1133 func
= list_entry(l
, struct acpiphp_func
, sibling
);
1135 /* We don't want to call _EJ0 on non-existing functions. */
1136 if ((func
->flags
& FUNC_HAS_EJ0
)) {
1137 /* _EJ0 method take one argument */
1139 arg_list
.pointer
= &arg
;
1140 arg
.type
= ACPI_TYPE_INTEGER
;
1141 arg
.integer
.value
= 1;
1143 status
= acpi_evaluate_object(func
->handle
, "_EJ0", &arg_list
, NULL
);
1144 if (ACPI_FAILURE(status
)) {
1145 warn("%s: _EJ0 failed\n", __FUNCTION__
);
1155 * acpiphp_check_bridge - re-enumerate devices
1157 * Iterate over all slots under this bridge and make sure that if a
1158 * card is present they are enabled, and if not they are disabled.
1160 static int acpiphp_check_bridge(struct acpiphp_bridge
*bridge
)
1162 struct acpiphp_slot
*slot
;
1164 int enabled
, disabled
;
1166 enabled
= disabled
= 0;
1168 for (slot
= bridge
->slots
; slot
; slot
= slot
->next
) {
1169 unsigned int status
= get_slot_status(slot
);
1170 if (slot
->flags
& SLOT_ENABLED
) {
1171 if (status
== ACPI_STA_ALL
)
1173 retval
= acpiphp_disable_slot(slot
);
1175 err("Error occurred in disabling\n");
1178 acpiphp_eject_slot(slot
);
1182 if (status
!= ACPI_STA_ALL
)
1184 retval
= acpiphp_enable_slot(slot
);
1186 err("Error occurred in enabling\n");
1193 dbg("%s: %d enabled, %d disabled\n", __FUNCTION__
, enabled
, disabled
);
1199 static void program_hpp(struct pci_dev
*dev
, struct acpiphp_bridge
*bridge
)
1201 u16 pci_cmd
, pci_bctl
;
1202 struct pci_dev
*cdev
;
1204 /* Program hpp values for this device */
1205 if (!(dev
->hdr_type
== PCI_HEADER_TYPE_NORMAL
||
1206 (dev
->hdr_type
== PCI_HEADER_TYPE_BRIDGE
&&
1207 (dev
->class >> 8) == PCI_CLASS_BRIDGE_PCI
)))
1209 pci_write_config_byte(dev
, PCI_CACHE_LINE_SIZE
,
1210 bridge
->hpp
.cache_line_size
);
1211 pci_write_config_byte(dev
, PCI_LATENCY_TIMER
,
1212 bridge
->hpp
.latency_timer
);
1213 pci_read_config_word(dev
, PCI_COMMAND
, &pci_cmd
);
1214 if (bridge
->hpp
.enable_serr
)
1215 pci_cmd
|= PCI_COMMAND_SERR
;
1217 pci_cmd
&= ~PCI_COMMAND_SERR
;
1218 if (bridge
->hpp
.enable_perr
)
1219 pci_cmd
|= PCI_COMMAND_PARITY
;
1221 pci_cmd
&= ~PCI_COMMAND_PARITY
;
1222 pci_write_config_word(dev
, PCI_COMMAND
, pci_cmd
);
1224 /* Program bridge control value and child devices */
1225 if ((dev
->class >> 8) == PCI_CLASS_BRIDGE_PCI
) {
1226 pci_write_config_byte(dev
, PCI_SEC_LATENCY_TIMER
,
1227 bridge
->hpp
.latency_timer
);
1228 pci_read_config_word(dev
, PCI_BRIDGE_CONTROL
, &pci_bctl
);
1229 if (bridge
->hpp
.enable_serr
)
1230 pci_bctl
|= PCI_BRIDGE_CTL_SERR
;
1232 pci_bctl
&= ~PCI_BRIDGE_CTL_SERR
;
1233 if (bridge
->hpp
.enable_perr
)
1234 pci_bctl
|= PCI_BRIDGE_CTL_PARITY
;
1236 pci_bctl
&= ~PCI_BRIDGE_CTL_PARITY
;
1237 pci_write_config_word(dev
, PCI_BRIDGE_CONTROL
, pci_bctl
);
1238 if (dev
->subordinate
) {
1239 list_for_each_entry(cdev
, &dev
->subordinate
->devices
,
1241 program_hpp(cdev
, bridge
);
1246 static void acpiphp_set_hpp_values(acpi_handle handle
, struct pci_bus
*bus
)
1248 struct acpiphp_bridge bridge
;
1249 struct pci_dev
*dev
;
1251 memset(&bridge
, 0, sizeof(bridge
));
1252 bridge
.handle
= handle
;
1253 bridge
.pci_bus
= bus
;
1254 bridge
.pci_dev
= bus
->self
;
1255 decode_hpp(&bridge
);
1256 list_for_each_entry(dev
, &bus
->devices
, bus_list
)
1257 program_hpp(dev
, &bridge
);
1262 * Remove devices for which we could not assign resources, call
1263 * arch specific code to fix-up the bus
1265 static void acpiphp_sanitize_bus(struct pci_bus
*bus
)
1267 struct pci_dev
*dev
;
1269 unsigned long type_mask
= IORESOURCE_IO
| IORESOURCE_MEM
;
1271 list_for_each_entry(dev
, &bus
->devices
, bus_list
) {
1272 for (i
=0; i
<PCI_BRIDGE_RESOURCES
; i
++) {
1273 struct resource
*res
= &dev
->resource
[i
];
1274 if ((res
->flags
& type_mask
) && !res
->start
&&
1276 /* Could not assign a required resources
1277 * for this device, remove it */
1278 pci_remove_bus_device(dev
);
1285 /* Program resources in newly inserted bridge */
1286 static int acpiphp_configure_bridge (acpi_handle handle
)
1288 struct acpi_pci_id pci_id
;
1289 struct pci_bus
*bus
;
1291 if (ACPI_FAILURE(acpi_get_pci_id(handle
, &pci_id
))) {
1292 err("cannot get PCI domain and bus number for bridge\n");
1295 bus
= pci_find_bus(pci_id
.segment
, pci_id
.bus
);
1297 err("cannot find bus %d:%d\n",
1298 pci_id
.segment
, pci_id
.bus
);
1302 pci_bus_size_bridges(bus
);
1303 pci_bus_assign_resources(bus
);
1304 acpiphp_sanitize_bus(bus
);
1305 acpiphp_set_hpp_values(handle
, bus
);
1306 pci_enable_bridges(bus
);
1307 acpiphp_configure_ioapics(handle
);
1311 static void handle_bridge_insertion(acpi_handle handle
, u32 type
)
1313 struct acpi_device
*device
, *pdevice
;
1314 acpi_handle phandle
;
1316 if ((type
!= ACPI_NOTIFY_BUS_CHECK
) &&
1317 (type
!= ACPI_NOTIFY_DEVICE_CHECK
)) {
1318 err("unexpected notification type %d\n", type
);
1322 acpi_get_parent(handle
, &phandle
);
1323 if (acpi_bus_get_device(phandle
, &pdevice
)) {
1324 dbg("no parent device, assuming NULL\n");
1327 if (acpi_bus_add(&device
, pdevice
, handle
, ACPI_BUS_TYPE_DEVICE
)) {
1328 err("cannot add bridge to acpi list\n");
1331 if (!acpiphp_configure_bridge(handle
) &&
1332 !acpi_bus_start(device
))
1335 err("cannot configure and start bridge\n");
1340 * ACPI event handlers
1344 * handle_hotplug_event_bridge - handle ACPI event on bridges
1346 * @handle: Notify()'ed acpi_handle
1347 * @type: Notify code
1348 * @context: pointer to acpiphp_bridge structure
1350 * handles ACPI event notification on {host,p2p} bridges
1353 static void handle_hotplug_event_bridge(acpi_handle handle
, u32 type
, void *context
)
1355 struct acpiphp_bridge
*bridge
;
1357 struct acpi_buffer buffer
= { .length
= sizeof(objname
),
1358 .pointer
= objname
};
1359 struct acpi_device
*device
;
1361 if (acpi_bus_get_device(handle
, &device
)) {
1362 /* This bridge must have just been physically inserted */
1363 handle_bridge_insertion(handle
, type
);
1367 bridge
= acpiphp_handle_to_bridge(handle
);
1369 err("cannot get bridge info\n");
1373 acpi_get_name(handle
, ACPI_FULL_PATHNAME
, &buffer
);
1376 case ACPI_NOTIFY_BUS_CHECK
:
1377 /* bus re-enumerate */
1378 dbg("%s: Bus check notify on %s\n", __FUNCTION__
, objname
);
1379 acpiphp_check_bridge(bridge
);
1382 case ACPI_NOTIFY_DEVICE_CHECK
:
1384 dbg("%s: Device check notify on %s\n", __FUNCTION__
, objname
);
1385 acpiphp_check_bridge(bridge
);
1388 case ACPI_NOTIFY_DEVICE_WAKE
:
1390 dbg("%s: Device wake notify on %s\n", __FUNCTION__
, objname
);
1393 case ACPI_NOTIFY_EJECT_REQUEST
:
1394 /* request device eject */
1395 dbg("%s: Device eject notify on %s\n", __FUNCTION__
, objname
);
1396 if ((bridge
->type
!= BRIDGE_TYPE_HOST
) &&
1397 (bridge
->flags
& BRIDGE_HAS_EJ0
)) {
1398 struct acpiphp_slot
*slot
;
1399 slot
= bridge
->func
->slot
;
1400 if (!acpiphp_disable_slot(slot
))
1401 acpiphp_eject_slot(slot
);
1405 case ACPI_NOTIFY_FREQUENCY_MISMATCH
:
1406 printk(KERN_ERR
"Device %s cannot be configured due"
1407 " to a frequency mismatch\n", objname
);
1410 case ACPI_NOTIFY_BUS_MODE_MISMATCH
:
1411 printk(KERN_ERR
"Device %s cannot be configured due"
1412 " to a bus mode mismatch\n", objname
);
1415 case ACPI_NOTIFY_POWER_FAULT
:
1416 printk(KERN_ERR
"Device %s has suffered a power fault\n",
1421 warn("notify_handler: unknown event type 0x%x for %s\n", type
, objname
);
1427 * handle_hotplug_event_func - handle ACPI event on functions (i.e. slots)
1429 * @handle: Notify()'ed acpi_handle
1430 * @type: Notify code
1431 * @context: pointer to acpiphp_func structure
1433 * handles ACPI event notification on slots
1436 void handle_hotplug_event_func(acpi_handle handle
, u32 type
, void *context
)
1438 struct acpiphp_func
*func
;
1440 struct acpi_buffer buffer
= { .length
= sizeof(objname
),
1441 .pointer
= objname
};
1443 acpi_get_name(handle
, ACPI_FULL_PATHNAME
, &buffer
);
1445 func
= (struct acpiphp_func
*)context
;
1448 case ACPI_NOTIFY_BUS_CHECK
:
1449 /* bus re-enumerate */
1450 dbg("%s: Bus check notify on %s\n", __FUNCTION__
, objname
);
1451 acpiphp_enable_slot(func
->slot
);
1454 case ACPI_NOTIFY_DEVICE_CHECK
:
1455 /* device check : re-enumerate from parent bus */
1456 dbg("%s: Device check notify on %s\n", __FUNCTION__
, objname
);
1457 acpiphp_check_bridge(func
->slot
->bridge
);
1460 case ACPI_NOTIFY_DEVICE_WAKE
:
1462 dbg("%s: Device wake notify on %s\n", __FUNCTION__
, objname
);
1465 case ACPI_NOTIFY_EJECT_REQUEST
:
1466 /* request device eject */
1467 dbg("%s: Device eject notify on %s\n", __FUNCTION__
, objname
);
1468 if (!(acpiphp_disable_slot(func
->slot
)))
1469 acpiphp_eject_slot(func
->slot
);
1473 warn("notify_handler: unknown event type 0x%x for %s\n", type
, objname
);
1480 find_root_bridges(acpi_handle handle
, u32 lvl
, void *context
, void **rv
)
1482 int *count
= (int *)context
;
1484 if (acpi_root_bridge(handle
)) {
1485 acpi_install_notify_handler(handle
, ACPI_SYSTEM_NOTIFY
,
1486 handle_hotplug_event_bridge
, NULL
);
1492 static struct acpi_pci_driver acpi_pci_hp_driver
= {
1494 .remove
= remove_bridge
,
1498 * acpiphp_glue_init - initializes all PCI hotplug - ACPI glue data structures
1501 int __init
acpiphp_glue_init(void)
1505 acpi_walk_namespace(ACPI_TYPE_DEVICE
, ACPI_ROOT_OBJECT
,
1506 ACPI_UINT32_MAX
, find_root_bridges
, &num
, NULL
);
1511 acpi_pci_register_driver(&acpi_pci_hp_driver
);
1518 * acpiphp_glue_exit - terminates all PCI hotplug - ACPI glue data structures
1520 * This function frees all data allocated in acpiphp_glue_init()
1522 void __exit
acpiphp_glue_exit(void)
1524 acpi_pci_unregister_driver(&acpi_pci_hp_driver
);
1529 * acpiphp_get_num_slots - count number of slots in a system
1531 int __init
acpiphp_get_num_slots(void)
1533 struct list_head
*node
;
1534 struct acpiphp_bridge
*bridge
;
1539 list_for_each (node
, &bridge_list
) {
1540 bridge
= (struct acpiphp_bridge
*)node
;
1541 dbg("Bus %04x:%02x has %d slot%s\n",
1542 pci_domain_nr(bridge
->pci_bus
),
1543 bridge
->pci_bus
->number
, bridge
->nr_slots
,
1544 bridge
->nr_slots
== 1 ? "" : "s");
1545 num_slots
+= bridge
->nr_slots
;
1548 dbg("Total %d slots\n", num_slots
);
1555 * acpiphp_for_each_slot - call function for each slot
1556 * @fn: callback function
1557 * @data: context to be passed to callback function
1560 static int acpiphp_for_each_slot(acpiphp_callback fn
, void *data
)
1562 struct list_head
*node
;
1563 struct acpiphp_bridge
*bridge
;
1564 struct acpiphp_slot
*slot
;
1567 list_for_each (node
, &bridge_list
) {
1568 bridge
= (struct acpiphp_bridge
*)node
;
1569 for (slot
= bridge
->slots
; slot
; slot
= slot
->next
) {
1570 retval
= fn(slot
, data
);
1583 * acpiphp_enable_slot - power on slot
1585 int acpiphp_enable_slot(struct acpiphp_slot
*slot
)
1589 mutex_lock(&slot
->crit_sect
);
1591 /* wake up all functions */
1592 retval
= power_on_slot(slot
);
1596 if (get_slot_status(slot
) == ACPI_STA_ALL
) {
1597 /* configure all functions */
1598 retval
= enable_device(slot
);
1600 power_off_slot(slot
);
1602 dbg("%s: Slot status is not ACPI_STA_ALL\n", __FUNCTION__
);
1603 power_off_slot(slot
);
1607 mutex_unlock(&slot
->crit_sect
);
1612 * acpiphp_disable_slot - power off slot
1614 int acpiphp_disable_slot(struct acpiphp_slot
*slot
)
1618 mutex_lock(&slot
->crit_sect
);
1620 /* unconfigure all functions */
1621 retval
= disable_device(slot
);
1625 /* power off all functions */
1626 retval
= power_off_slot(slot
);
1631 mutex_unlock(&slot
->crit_sect
);
1640 u8
acpiphp_get_power_status(struct acpiphp_slot
*slot
)
1642 return (slot
->flags
& SLOT_POWEREDON
);
1650 u8
acpiphp_get_latch_status(struct acpiphp_slot
*slot
)
1654 sta
= get_slot_status(slot
);
1656 return (sta
& ACPI_STA_SHOW_IN_UI
) ? 1 : 0;
1661 * adapter presence : 1
1664 u8
acpiphp_get_adapter_status(struct acpiphp_slot
*slot
)
1668 sta
= get_slot_status(slot
);
1670 return (sta
== 0) ? 0 : 1;
1675 * pci address (seg/bus/dev)
1677 u32
acpiphp_get_address(struct acpiphp_slot
*slot
)
1680 struct pci_bus
*pci_bus
= slot
->bridge
->pci_bus
;
1682 address
= (pci_domain_nr(pci_bus
) << 16) |
1683 (pci_bus
->number
<< 8) |