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 <kristen.c.accardi@intel.com>
34 * Lifetime rules for pci_dev:
35 * - The one in acpiphp_bridge has its refcount elevated by pci_get_slot()
36 * when the bridge is scanned and it loses a refcount when the bridge
38 * - When a P2P bridge is present, we elevate the refcount on the subordinate
39 * bus. It loses the refcount when the the driver unloads.
42 #include <linux/init.h>
43 #include <linux/module.h>
45 #include <linux/kernel.h>
46 #include <linux/pci.h>
47 #include <linux/pci_hotplug.h>
48 #include <linux/pci-acpi.h>
49 #include <linux/mutex.h>
50 #include <linux/slab.h>
51 #include <linux/acpi.h>
56 static LIST_HEAD(bridge_list
);
58 #define MY_NAME "acpiphp_glue"
60 static void handle_hotplug_event_bridge (acpi_handle
, u32
, void *);
61 static void acpiphp_sanitize_bus(struct pci_bus
*bus
);
62 static void acpiphp_set_hpp_values(struct pci_bus
*bus
);
63 static void handle_hotplug_event_func(acpi_handle handle
, u32 type
, void *context
);
65 /* callback routine to check for the existence of a pci dock device */
67 is_pci_dock_device(acpi_handle handle
, u32 lvl
, void *context
, void **rv
)
69 int *count
= (int *)context
;
71 if (is_dock_device(handle
)) {
73 return AE_CTRL_TERMINATE
;
80 * the _DCK method can do funny things... and sometimes not
83 * TBD - figure out a way to only call fixups for
84 * systems that require them.
86 static int post_dock_fixups(struct notifier_block
*nb
, unsigned long val
,
89 struct acpiphp_func
*func
= container_of(nb
, struct acpiphp_func
, nb
);
90 struct pci_bus
*bus
= func
->slot
->bridge
->pci_bus
;
96 /* fixup bad _DCK function that rewrites
97 * secondary bridge on slot
99 pci_read_config_dword(bus
->self
,
103 if (((buses
>> 8) & 0xff) != bus
->secondary
) {
104 buses
= (buses
& 0xff000000)
105 | ((unsigned int)(bus
->primary
) << 0)
106 | ((unsigned int)(bus
->secondary
) << 8)
107 | ((unsigned int)(bus
->subordinate
) << 16);
108 pci_write_config_dword(bus
->self
, PCI_PRIMARY_BUS
, buses
);
114 static const struct acpi_dock_ops acpiphp_dock_ops
= {
115 .handler
= handle_hotplug_event_func
,
118 /* callback routine to register each ACPI PCI slot object */
120 register_slot(acpi_handle handle
, u32 lvl
, void *context
, void **rv
)
122 struct acpiphp_bridge
*bridge
= (struct acpiphp_bridge
*)context
;
123 struct acpiphp_slot
*slot
;
124 struct acpiphp_func
*newfunc
;
126 acpi_status status
= AE_OK
;
127 unsigned long long adr
, sun
;
128 int device
, function
, retval
;
129 struct pci_bus
*pbus
= bridge
->pci_bus
;
130 struct pci_dev
*pdev
;
132 if (!acpi_pci_check_ejectable(pbus
, handle
) && !is_dock_device(handle
))
135 acpi_evaluate_integer(handle
, "_ADR", NULL
, &adr
);
136 device
= (adr
>> 16) & 0xffff;
137 function
= adr
& 0xffff;
139 newfunc
= kzalloc(sizeof(struct acpiphp_func
), GFP_KERNEL
);
143 INIT_LIST_HEAD(&newfunc
->sibling
);
144 newfunc
->handle
= handle
;
145 newfunc
->function
= function
;
147 if (ACPI_SUCCESS(acpi_get_handle(handle
, "_EJ0", &tmp
)))
148 newfunc
->flags
= FUNC_HAS_EJ0
;
150 if (ACPI_SUCCESS(acpi_get_handle(handle
, "_STA", &tmp
)))
151 newfunc
->flags
|= FUNC_HAS_STA
;
153 if (ACPI_SUCCESS(acpi_get_handle(handle
, "_PS0", &tmp
)))
154 newfunc
->flags
|= FUNC_HAS_PS0
;
156 if (ACPI_SUCCESS(acpi_get_handle(handle
, "_PS3", &tmp
)))
157 newfunc
->flags
|= FUNC_HAS_PS3
;
159 if (ACPI_SUCCESS(acpi_get_handle(handle
, "_DCK", &tmp
)))
160 newfunc
->flags
|= FUNC_HAS_DCK
;
162 status
= acpi_evaluate_integer(handle
, "_SUN", NULL
, &sun
);
163 if (ACPI_FAILURE(status
)) {
165 * use the count of the number of slots we've found
166 * for the number of the slot
168 sun
= bridge
->nr_slots
+1;
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");
180 slot
= kzalloc(sizeof(struct acpiphp_slot
), GFP_KERNEL
);
186 slot
->bridge
= bridge
;
187 slot
->device
= device
;
189 INIT_LIST_HEAD(&slot
->funcs
);
190 mutex_init(&slot
->crit_sect
);
192 slot
->next
= bridge
->slots
;
193 bridge
->slots
= slot
;
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
);
201 if (retval
== -EBUSY
)
202 warn("Slot %llu already registered by another "
203 "hotplug driver\n", slot
->sun
);
205 warn("acpiphp_register_hotplug_slot failed "
206 "(err code = 0x%x)\n", retval
);
211 newfunc
->slot
= slot
;
212 list_add_tail(&newfunc
->sibling
, &slot
->funcs
);
214 pdev
= pci_get_slot(pbus
, PCI_DEVFN(device
, function
));
216 pdev
->current_state
= PCI_D0
;
217 slot
->flags
|= (SLOT_ENABLED
| SLOT_POWEREDON
);
221 if (is_dock_device(handle
)) {
222 /* we don't want to call this device's _EJ0
223 * because we want the dock notify handler
224 * to call it after it calls _DCK
226 newfunc
->flags
&= ~FUNC_HAS_EJ0
;
227 if (register_hotplug_dock_device(handle
,
228 &acpiphp_dock_ops
, newfunc
))
229 dbg("failed to register dock device\n");
231 /* we need to be notified when dock events happen
232 * outside of the hotplug operation, since we may
233 * need to do fixups before we can hotplug.
235 newfunc
->nb
.notifier_call
= post_dock_fixups
;
236 if (register_dock_notifier(&newfunc
->nb
))
237 dbg("failed to register a dock notifier");
240 /* install notify handler */
241 if (!(newfunc
->flags
& FUNC_HAS_DCK
)) {
242 status
= acpi_install_notify_handler(handle
,
244 handle_hotplug_event_func
,
247 if (ACPI_FAILURE(status
))
248 err("failed to register interrupt notify handler\n");
256 bridge
->slots
= slot
->next
;
264 /* see if it's worth looking at this bridge */
265 static int detect_ejectable_slots(acpi_handle handle
)
267 int found
= acpi_pci_detect_ejectable(handle
);
269 acpi_walk_namespace(ACPI_TYPE_DEVICE
, handle
, (u32
)1,
270 is_pci_dock_device
, NULL
, (void *)&found
, NULL
);
275 /* initialize miscellaneous stuff for both root and PCI-to-PCI bridge */
276 static void init_bridge_misc(struct acpiphp_bridge
*bridge
)
280 /* must be added to the list prior to calling register_slot */
281 list_add(&bridge
->list
, &bridge_list
);
283 /* register all slot objects under this bridge */
284 status
= acpi_walk_namespace(ACPI_TYPE_DEVICE
, bridge
->handle
, (u32
)1,
285 register_slot
, NULL
, bridge
, NULL
);
286 if (ACPI_FAILURE(status
)) {
287 list_del(&bridge
->list
);
291 /* install notify handler */
292 if (bridge
->type
!= BRIDGE_TYPE_HOST
) {
293 if ((bridge
->flags
& BRIDGE_HAS_EJ0
) && bridge
->func
) {
294 status
= acpi_remove_notify_handler(bridge
->func
->handle
,
296 handle_hotplug_event_func
);
297 if (ACPI_FAILURE(status
))
298 err("failed to remove notify handler\n");
300 status
= acpi_install_notify_handler(bridge
->handle
,
302 handle_hotplug_event_bridge
,
305 if (ACPI_FAILURE(status
)) {
306 err("failed to register interrupt notify handler\n");
312 /* find acpiphp_func from acpiphp_bridge */
313 static struct acpiphp_func
*acpiphp_bridge_handle_to_function(acpi_handle handle
)
315 struct acpiphp_bridge
*bridge
;
316 struct acpiphp_slot
*slot
;
317 struct acpiphp_func
*func
;
319 list_for_each_entry(bridge
, &bridge_list
, list
) {
320 for (slot
= bridge
->slots
; slot
; slot
= slot
->next
) {
321 list_for_each_entry(func
, &slot
->funcs
, sibling
) {
322 if (func
->handle
== handle
)
332 static inline void config_p2p_bridge_flags(struct acpiphp_bridge
*bridge
)
334 acpi_handle dummy_handle
;
336 if (ACPI_SUCCESS(acpi_get_handle(bridge
->handle
,
337 "_STA", &dummy_handle
)))
338 bridge
->flags
|= BRIDGE_HAS_STA
;
340 if (ACPI_SUCCESS(acpi_get_handle(bridge
->handle
,
341 "_EJ0", &dummy_handle
)))
342 bridge
->flags
|= BRIDGE_HAS_EJ0
;
344 if (ACPI_SUCCESS(acpi_get_handle(bridge
->handle
,
345 "_PS0", &dummy_handle
)))
346 bridge
->flags
|= BRIDGE_HAS_PS0
;
348 if (ACPI_SUCCESS(acpi_get_handle(bridge
->handle
,
349 "_PS3", &dummy_handle
)))
350 bridge
->flags
|= BRIDGE_HAS_PS3
;
352 /* is this ejectable p2p bridge? */
353 if (bridge
->flags
& BRIDGE_HAS_EJ0
) {
354 struct acpiphp_func
*func
;
356 dbg("found ejectable p2p bridge\n");
358 /* make link between PCI bridge and PCI function */
359 func
= acpiphp_bridge_handle_to_function(bridge
->handle
);
363 func
->bridge
= bridge
;
368 /* allocate and initialize host bridge data structure */
369 static void add_host_bridge(acpi_handle
*handle
)
371 struct acpiphp_bridge
*bridge
;
372 struct acpi_pci_root
*root
= acpi_pci_find_root(handle
);
374 bridge
= kzalloc(sizeof(struct acpiphp_bridge
), GFP_KERNEL
);
378 bridge
->type
= BRIDGE_TYPE_HOST
;
379 bridge
->handle
= handle
;
381 bridge
->pci_bus
= root
->bus
;
383 spin_lock_init(&bridge
->res_lock
);
385 init_bridge_misc(bridge
);
389 /* allocate and initialize PCI-to-PCI bridge data structure */
390 static void add_p2p_bridge(acpi_handle
*handle
)
392 struct acpiphp_bridge
*bridge
;
394 bridge
= kzalloc(sizeof(struct acpiphp_bridge
), GFP_KERNEL
);
395 if (bridge
== NULL
) {
396 err("out of memory\n");
400 bridge
->type
= BRIDGE_TYPE_P2P
;
401 bridge
->handle
= handle
;
402 config_p2p_bridge_flags(bridge
);
404 bridge
->pci_dev
= acpi_get_pci_dev(handle
);
405 bridge
->pci_bus
= bridge
->pci_dev
->subordinate
;
406 if (!bridge
->pci_bus
) {
407 err("This is not a PCI-to-PCI bridge!\n");
412 * Grab a ref to the subordinate PCI bus in case the bus is
413 * removed via PCI core logical hotplug. The ref pins the bus
414 * (which we access during module unload).
416 get_device(&bridge
->pci_bus
->dev
);
417 spin_lock_init(&bridge
->res_lock
);
419 init_bridge_misc(bridge
);
422 pci_dev_put(bridge
->pci_dev
);
428 /* callback routine to find P2P bridges */
430 find_p2p_bridge(acpi_handle handle
, u32 lvl
, void *context
, void **rv
)
435 dev
= acpi_get_pci_dev(handle
);
436 if (!dev
|| !dev
->subordinate
)
439 /* check if this bridge has ejectable slots */
440 if ((detect_ejectable_slots(handle
) > 0)) {
441 dbg("found PCI-to-PCI bridge at PCI %s\n", pci_name(dev
));
442 add_p2p_bridge(handle
);
445 /* search P2P bridges under this p2p bridge */
446 status
= acpi_walk_namespace(ACPI_TYPE_DEVICE
, handle
, (u32
)1,
447 find_p2p_bridge
, NULL
, NULL
, NULL
);
448 if (ACPI_FAILURE(status
))
449 warn("find_p2p_bridge failed (error code = 0x%x)\n", status
);
457 /* find hot-pluggable slots, and then find P2P bridge */
458 static int add_bridge(acpi_handle handle
)
461 unsigned long long tmp
;
462 struct acpi_pci_root
*root
;
463 acpi_handle dummy_handle
;
466 * We shouldn't use this bridge if PCIe native hotplug control has been
467 * granted by the BIOS for it.
469 root
= acpi_pci_find_root(handle
);
470 if (root
&& (root
->osc_control_set
& OSC_PCI_NATIVE_HOTPLUG
))
473 /* if the bridge doesn't have _STA, we assume it is always there */
474 status
= acpi_get_handle(handle
, "_STA", &dummy_handle
);
475 if (ACPI_SUCCESS(status
)) {
476 status
= acpi_evaluate_integer(handle
, "_STA", NULL
, &tmp
);
477 if (ACPI_FAILURE(status
)) {
478 dbg("%s: _STA evaluation failure\n", __func__
);
481 if ((tmp
& ACPI_STA_FUNCTIONING
) == 0)
482 /* don't register this object */
486 /* check if this bridge has ejectable slots */
487 if (detect_ejectable_slots(handle
) > 0) {
488 dbg("found PCI host-bus bridge with hot-pluggable slots\n");
489 add_host_bridge(handle
);
492 /* search P2P bridges under this host bridge */
493 status
= acpi_walk_namespace(ACPI_TYPE_DEVICE
, handle
, (u32
)1,
494 find_p2p_bridge
, NULL
, NULL
, NULL
);
496 if (ACPI_FAILURE(status
))
497 warn("find_p2p_bridge failed (error code = 0x%x)\n", status
);
502 static struct acpiphp_bridge
*acpiphp_handle_to_bridge(acpi_handle handle
)
504 struct acpiphp_bridge
*bridge
;
506 list_for_each_entry(bridge
, &bridge_list
, list
)
507 if (bridge
->handle
== handle
)
513 static void cleanup_bridge(struct acpiphp_bridge
*bridge
)
515 struct acpiphp_slot
*slot
, *next
;
516 struct acpiphp_func
*func
, *tmp
;
518 acpi_handle handle
= bridge
->handle
;
520 status
= acpi_remove_notify_handler(handle
, ACPI_SYSTEM_NOTIFY
,
521 handle_hotplug_event_bridge
);
522 if (ACPI_FAILURE(status
))
523 err("failed to remove notify handler\n");
525 if ((bridge
->type
!= BRIDGE_TYPE_HOST
) &&
526 ((bridge
->flags
& BRIDGE_HAS_EJ0
) && bridge
->func
)) {
527 status
= acpi_install_notify_handler(bridge
->func
->handle
,
529 handle_hotplug_event_func
,
531 if (ACPI_FAILURE(status
))
532 err("failed to install interrupt notify handler\n");
535 slot
= bridge
->slots
;
538 list_for_each_entry_safe(func
, tmp
, &slot
->funcs
, sibling
) {
539 if (is_dock_device(func
->handle
)) {
540 unregister_hotplug_dock_device(func
->handle
);
541 unregister_dock_notifier(&func
->nb
);
543 if (!(func
->flags
& FUNC_HAS_DCK
)) {
544 status
= acpi_remove_notify_handler(func
->handle
,
546 handle_hotplug_event_func
);
547 if (ACPI_FAILURE(status
))
548 err("failed to remove notify handler\n");
550 list_del(&func
->sibling
);
553 acpiphp_unregister_hotplug_slot(slot
);
554 list_del(&slot
->funcs
);
560 * Only P2P bridges have a pci_dev
563 put_device(&bridge
->pci_bus
->dev
);
565 pci_dev_put(bridge
->pci_dev
);
566 list_del(&bridge
->list
);
571 cleanup_p2p_bridge(acpi_handle handle
, u32 lvl
, void *context
, void **rv
)
573 struct acpiphp_bridge
*bridge
;
575 /* cleanup p2p bridges under this P2P bridge
576 in a depth-first manner */
577 acpi_walk_namespace(ACPI_TYPE_DEVICE
, handle
, (u32
)1,
578 cleanup_p2p_bridge
, NULL
, NULL
, NULL
);
580 bridge
= acpiphp_handle_to_bridge(handle
);
582 cleanup_bridge(bridge
);
587 static void remove_bridge(acpi_handle handle
)
589 struct acpiphp_bridge
*bridge
;
591 /* cleanup p2p bridges under this host bridge
592 in a depth-first manner */
593 acpi_walk_namespace(ACPI_TYPE_DEVICE
, handle
,
594 (u32
)1, cleanup_p2p_bridge
, NULL
, NULL
, NULL
);
597 * On root bridges with hotplug slots directly underneath (ie,
598 * no p2p bridge between), we call cleanup_bridge().
600 * The else clause cleans up root bridges that either had no
601 * hotplug slots at all, or had a p2p bridge underneath.
603 bridge
= acpiphp_handle_to_bridge(handle
);
605 cleanup_bridge(bridge
);
607 acpi_remove_notify_handler(handle
, ACPI_SYSTEM_NOTIFY
,
608 handle_hotplug_event_bridge
);
611 static int power_on_slot(struct acpiphp_slot
*slot
)
614 struct acpiphp_func
*func
;
617 /* if already enabled, just skip */
618 if (slot
->flags
& SLOT_POWEREDON
)
621 list_for_each_entry(func
, &slot
->funcs
, sibling
) {
622 if (func
->flags
& FUNC_HAS_PS0
) {
623 dbg("%s: executing _PS0\n", __func__
);
624 status
= acpi_evaluate_object(func
->handle
, "_PS0", NULL
, NULL
);
625 if (ACPI_FAILURE(status
)) {
626 warn("%s: _PS0 failed\n", __func__
);
634 /* TBD: evaluate _STA to check if the slot is enabled */
636 slot
->flags
|= SLOT_POWEREDON
;
643 static int power_off_slot(struct acpiphp_slot
*slot
)
646 struct acpiphp_func
*func
;
650 /* if already disabled, just skip */
651 if ((slot
->flags
& SLOT_POWEREDON
) == 0)
654 list_for_each_entry(func
, &slot
->funcs
, sibling
) {
655 if (func
->flags
& FUNC_HAS_PS3
) {
656 status
= acpi_evaluate_object(func
->handle
, "_PS3", NULL
, NULL
);
657 if (ACPI_FAILURE(status
)) {
658 warn("%s: _PS3 failed\n", __func__
);
666 /* TBD: evaluate _STA to check if the slot is disabled */
668 slot
->flags
&= (~SLOT_POWEREDON
);
677 * acpiphp_max_busnr - return the highest reserved bus number under the given bus.
678 * @bus: bus to start search with
680 static unsigned char acpiphp_max_busnr(struct pci_bus
*bus
)
682 struct list_head
*tmp
;
683 unsigned char max
, n
;
686 * pci_bus_max_busnr will return the highest
687 * reserved busnr for all these children.
688 * that is equivalent to the bus->subordinate
689 * value. We don't want to use the parent's
690 * bus->subordinate value because it could have
693 max
= bus
->secondary
;
695 list_for_each(tmp
, &bus
->children
) {
696 n
= pci_bus_max_busnr(pci_bus_b(tmp
));
705 * acpiphp_bus_add - add a new bus to acpi subsystem
706 * @func: acpiphp_func of the bridge
708 static int acpiphp_bus_add(struct acpiphp_func
*func
)
711 struct acpi_device
*device
, *pdevice
;
714 acpi_get_parent(func
->handle
, &phandle
);
715 if (acpi_bus_get_device(phandle
, &pdevice
)) {
716 dbg("no parent device, assuming NULL\n");
719 if (!acpi_bus_get_device(func
->handle
, &device
)) {
720 dbg("bus exists... trim\n");
721 /* this shouldn't be in here, so remove
722 * the bus then re-add it...
724 ret_val
= acpi_bus_trim(device
, 1);
725 dbg("acpi_bus_trim return %x\n", ret_val
);
728 ret_val
= acpi_bus_add(&device
, pdevice
, func
->handle
,
729 ACPI_BUS_TYPE_DEVICE
);
731 dbg("error adding bus, %x\n",
733 goto acpiphp_bus_add_out
;
735 ret_val
= acpi_bus_start(device
);
743 * acpiphp_bus_trim - trim a bus from acpi subsystem
744 * @handle: handle to acpi namespace
746 static int acpiphp_bus_trim(acpi_handle handle
)
748 struct acpi_device
*device
;
751 retval
= acpi_bus_get_device(handle
, &device
);
753 dbg("acpi_device not found\n");
757 retval
= acpi_bus_trim(device
, 1);
759 err("cannot remove from acpi list\n");
764 static void acpiphp_set_acpi_region(struct acpiphp_slot
*slot
)
766 struct acpiphp_func
*func
;
767 union acpi_object params
[2];
768 struct acpi_object_list arg_list
;
770 list_for_each_entry(func
, &slot
->funcs
, sibling
) {
772 arg_list
.pointer
= params
;
773 params
[0].type
= ACPI_TYPE_INTEGER
;
774 params
[0].integer
.value
= ACPI_ADR_SPACE_PCI_CONFIG
;
775 params
[1].type
= ACPI_TYPE_INTEGER
;
776 params
[1].integer
.value
= 1;
777 /* _REG is optional, we don't care about if there is failure */
778 acpi_evaluate_object(func
->handle
, "_REG", &arg_list
, NULL
);
783 * enable_device - enable, configure a slot
784 * @slot: slot to be enabled
786 * This function should be called per *physical slot*,
787 * not per each slot object in ACPI namespace.
789 static int __ref
enable_device(struct acpiphp_slot
*slot
)
792 struct pci_bus
*bus
= slot
->bridge
->pci_bus
;
793 struct acpiphp_func
*func
;
798 if (slot
->flags
& SLOT_ENABLED
)
801 /* sanity check: dev should be NULL when hot-plugged in */
802 dev
= pci_get_slot(bus
, PCI_DEVFN(slot
->device
, 0));
804 /* This case shouldn't happen */
805 err("pci_dev structure already exists.\n");
811 num
= pci_scan_slot(bus
, PCI_DEVFN(slot
->device
, 0));
813 err("No new device found\n");
818 max
= acpiphp_max_busnr(bus
);
819 for (pass
= 0; pass
< 2; pass
++) {
820 list_for_each_entry(dev
, &bus
->devices
, bus_list
) {
821 if (PCI_SLOT(dev
->devfn
) != slot
->device
)
823 if (dev
->hdr_type
== PCI_HEADER_TYPE_BRIDGE
||
824 dev
->hdr_type
== PCI_HEADER_TYPE_CARDBUS
) {
825 max
= pci_scan_bridge(bus
, dev
, max
, pass
);
826 if (pass
&& dev
->subordinate
)
827 pci_bus_size_bridges(dev
->subordinate
);
832 list_for_each_entry(func
, &slot
->funcs
, sibling
)
833 acpiphp_bus_add(func
);
835 pci_bus_assign_resources(bus
);
836 acpiphp_sanitize_bus(bus
);
837 acpiphp_set_hpp_values(bus
);
838 acpiphp_set_acpi_region(slot
);
839 pci_enable_bridges(bus
);
841 list_for_each_entry(dev
, &bus
->devices
, bus_list
) {
842 /* Assume that newly added devices are powered on already. */
844 dev
->current_state
= PCI_D0
;
847 pci_bus_add_devices(bus
);
849 list_for_each_entry(func
, &slot
->funcs
, sibling
) {
850 dev
= pci_get_slot(bus
, PCI_DEVFN(slot
->device
,
855 if (dev
->hdr_type
!= PCI_HEADER_TYPE_BRIDGE
&&
856 dev
->hdr_type
!= PCI_HEADER_TYPE_CARDBUS
) {
861 status
= find_p2p_bridge(func
->handle
, (u32
)1, bus
, NULL
);
862 if (ACPI_FAILURE(status
))
863 warn("find_p2p_bridge failed (error code = 0x%x)\n",
868 slot
->flags
|= SLOT_ENABLED
;
874 static void disable_bridges(struct pci_bus
*bus
)
877 list_for_each_entry(dev
, &bus
->devices
, bus_list
) {
878 if (dev
->subordinate
) {
879 disable_bridges(dev
->subordinate
);
880 pci_disable_device(dev
);
886 * disable_device - disable a slot
887 * @slot: ACPI PHP slot
889 static int disable_device(struct acpiphp_slot
*slot
)
891 struct acpiphp_func
*func
;
892 struct pci_dev
*pdev
;
894 /* is this slot already disabled? */
895 if (!(slot
->flags
& SLOT_ENABLED
))
898 list_for_each_entry(func
, &slot
->funcs
, sibling
) {
900 /* cleanup p2p bridges under this P2P bridge */
901 cleanup_p2p_bridge(func
->bridge
->handle
,
906 pdev
= pci_get_slot(slot
->bridge
->pci_bus
,
907 PCI_DEVFN(slot
->device
, func
->function
));
909 pci_stop_bus_device(pdev
);
910 if (pdev
->subordinate
) {
911 disable_bridges(pdev
->subordinate
);
912 pci_disable_device(pdev
);
914 pci_remove_bus_device(pdev
);
919 list_for_each_entry(func
, &slot
->funcs
, sibling
) {
920 acpiphp_bus_trim(func
->handle
);
923 slot
->flags
&= (~SLOT_ENABLED
);
931 * get_slot_status - get ACPI slot status
932 * @slot: ACPI PHP slot
934 * If a slot has _STA for each function and if any one of them
935 * returned non-zero status, return it.
937 * If a slot doesn't have _STA and if any one of its functions'
938 * configuration space is configured, return 0x0f as a _STA.
940 * Otherwise return 0.
942 static unsigned int get_slot_status(struct acpiphp_slot
*slot
)
945 unsigned long long sta
= 0;
947 struct acpiphp_func
*func
;
949 list_for_each_entry(func
, &slot
->funcs
, sibling
) {
950 if (func
->flags
& FUNC_HAS_STA
) {
951 status
= acpi_evaluate_integer(func
->handle
, "_STA", NULL
, &sta
);
952 if (ACPI_SUCCESS(status
) && sta
)
955 pci_bus_read_config_dword(slot
->bridge
->pci_bus
,
956 PCI_DEVFN(slot
->device
,
958 PCI_VENDOR_ID
, &dvid
);
959 if (dvid
!= 0xffffffff) {
966 return (unsigned int)sta
;
970 * acpiphp_eject_slot - physically eject the slot
971 * @slot: ACPI PHP slot
973 int acpiphp_eject_slot(struct acpiphp_slot
*slot
)
976 struct acpiphp_func
*func
;
977 struct acpi_object_list arg_list
;
978 union acpi_object arg
;
980 list_for_each_entry(func
, &slot
->funcs
, sibling
) {
981 /* We don't want to call _EJ0 on non-existing functions. */
982 if ((func
->flags
& FUNC_HAS_EJ0
)) {
983 /* _EJ0 method take one argument */
985 arg_list
.pointer
= &arg
;
986 arg
.type
= ACPI_TYPE_INTEGER
;
987 arg
.integer
.value
= 1;
989 status
= acpi_evaluate_object(func
->handle
, "_EJ0", &arg_list
, NULL
);
990 if (ACPI_FAILURE(status
)) {
991 warn("%s: _EJ0 failed\n", __func__
);
1001 * acpiphp_check_bridge - re-enumerate devices
1002 * @bridge: where to begin re-enumeration
1004 * Iterate over all slots under this bridge and make sure that if a
1005 * card is present they are enabled, and if not they are disabled.
1007 static int acpiphp_check_bridge(struct acpiphp_bridge
*bridge
)
1009 struct acpiphp_slot
*slot
;
1011 int enabled
, disabled
;
1013 enabled
= disabled
= 0;
1015 for (slot
= bridge
->slots
; slot
; slot
= slot
->next
) {
1016 unsigned int status
= get_slot_status(slot
);
1017 if (slot
->flags
& SLOT_ENABLED
) {
1018 if (status
== ACPI_STA_ALL
)
1020 retval
= acpiphp_disable_slot(slot
);
1022 err("Error occurred in disabling\n");
1025 acpiphp_eject_slot(slot
);
1029 if (status
!= ACPI_STA_ALL
)
1031 retval
= acpiphp_enable_slot(slot
);
1033 err("Error occurred in enabling\n");
1040 dbg("%s: %d enabled, %d disabled\n", __func__
, enabled
, disabled
);
1046 static void acpiphp_set_hpp_values(struct pci_bus
*bus
)
1048 struct pci_dev
*dev
;
1050 list_for_each_entry(dev
, &bus
->devices
, bus_list
)
1051 pci_configure_slot(dev
);
1055 * Remove devices for which we could not assign resources, call
1056 * arch specific code to fix-up the bus
1058 static void acpiphp_sanitize_bus(struct pci_bus
*bus
)
1060 struct pci_dev
*dev
;
1062 unsigned long type_mask
= IORESOURCE_IO
| IORESOURCE_MEM
;
1064 list_for_each_entry(dev
, &bus
->devices
, bus_list
) {
1065 for (i
=0; i
<PCI_BRIDGE_RESOURCES
; i
++) {
1066 struct resource
*res
= &dev
->resource
[i
];
1067 if ((res
->flags
& type_mask
) && !res
->start
&&
1069 /* Could not assign a required resources
1070 * for this device, remove it */
1071 pci_remove_bus_device(dev
);
1078 /* Program resources in newly inserted bridge */
1079 static int acpiphp_configure_bridge (acpi_handle handle
)
1081 struct pci_bus
*bus
;
1083 if (acpi_is_root_bridge(handle
)) {
1084 struct acpi_pci_root
*root
= acpi_pci_find_root(handle
);
1087 struct pci_dev
*pdev
= acpi_get_pci_dev(handle
);
1088 bus
= pdev
->subordinate
;
1092 pci_bus_size_bridges(bus
);
1093 pci_bus_assign_resources(bus
);
1094 acpiphp_sanitize_bus(bus
);
1095 acpiphp_set_hpp_values(bus
);
1096 pci_enable_bridges(bus
);
1100 static void handle_bridge_insertion(acpi_handle handle
, u32 type
)
1102 struct acpi_device
*device
, *pdevice
;
1103 acpi_handle phandle
;
1105 if ((type
!= ACPI_NOTIFY_BUS_CHECK
) &&
1106 (type
!= ACPI_NOTIFY_DEVICE_CHECK
)) {
1107 err("unexpected notification type %d\n", type
);
1111 acpi_get_parent(handle
, &phandle
);
1112 if (acpi_bus_get_device(phandle
, &pdevice
)) {
1113 dbg("no parent device, assuming NULL\n");
1116 if (acpi_bus_add(&device
, pdevice
, handle
, ACPI_BUS_TYPE_DEVICE
)) {
1117 err("cannot add bridge to acpi list\n");
1120 if (!acpiphp_configure_bridge(handle
) &&
1121 !acpi_bus_start(device
))
1124 err("cannot configure and start bridge\n");
1129 * ACPI event handlers
1133 count_sub_bridges(acpi_handle handle
, u32 lvl
, void *context
, void **rv
)
1135 int *count
= (int *)context
;
1136 struct acpiphp_bridge
*bridge
;
1138 bridge
= acpiphp_handle_to_bridge(handle
);
1145 check_sub_bridges(acpi_handle handle
, u32 lvl
, void *context
, void **rv
)
1147 struct acpiphp_bridge
*bridge
;
1149 struct acpi_buffer buffer
= { .length
= sizeof(objname
),
1150 .pointer
= objname
};
1152 bridge
= acpiphp_handle_to_bridge(handle
);
1154 acpi_get_name(handle
, ACPI_FULL_PATHNAME
, &buffer
);
1155 dbg("%s: re-enumerating slots under %s\n",
1157 acpiphp_check_bridge(bridge
);
1162 struct acpiphp_hp_work
{
1163 struct work_struct work
;
1169 static void alloc_acpiphp_hp_work(acpi_handle handle
, u32 type
,
1171 void (*func
)(struct work_struct
*work
))
1173 struct acpiphp_hp_work
*hp_work
;
1176 hp_work
= kmalloc(sizeof(*hp_work
), GFP_KERNEL
);
1180 hp_work
->handle
= handle
;
1181 hp_work
->type
= type
;
1182 hp_work
->context
= context
;
1184 INIT_WORK(&hp_work
->work
, func
);
1185 ret
= queue_work(kacpi_hotplug_wq
, &hp_work
->work
);
1190 static void _handle_hotplug_event_bridge(struct work_struct
*work
)
1192 struct acpiphp_bridge
*bridge
;
1194 struct acpi_buffer buffer
= { .length
= sizeof(objname
),
1195 .pointer
= objname
};
1196 struct acpi_device
*device
;
1197 int num_sub_bridges
= 0;
1198 struct acpiphp_hp_work
*hp_work
;
1202 hp_work
= container_of(work
, struct acpiphp_hp_work
, work
);
1203 handle
= hp_work
->handle
;
1204 type
= hp_work
->type
;
1206 if (acpi_bus_get_device(handle
, &device
)) {
1207 /* This bridge must have just been physically inserted */
1208 handle_bridge_insertion(handle
, type
);
1212 bridge
= acpiphp_handle_to_bridge(handle
);
1213 if (type
== ACPI_NOTIFY_BUS_CHECK
) {
1214 acpi_walk_namespace(ACPI_TYPE_DEVICE
, handle
, ACPI_UINT32_MAX
,
1215 count_sub_bridges
, NULL
, &num_sub_bridges
, NULL
);
1218 if (!bridge
&& !num_sub_bridges
) {
1219 err("cannot get bridge info\n");
1223 acpi_get_name(handle
, ACPI_FULL_PATHNAME
, &buffer
);
1226 case ACPI_NOTIFY_BUS_CHECK
:
1227 /* bus re-enumerate */
1228 dbg("%s: Bus check notify on %s\n", __func__
, objname
);
1230 dbg("%s: re-enumerating slots under %s\n",
1232 acpiphp_check_bridge(bridge
);
1234 if (num_sub_bridges
)
1235 acpi_walk_namespace(ACPI_TYPE_DEVICE
, handle
,
1236 ACPI_UINT32_MAX
, check_sub_bridges
, NULL
, NULL
, NULL
);
1239 case ACPI_NOTIFY_DEVICE_CHECK
:
1241 dbg("%s: Device check notify on %s\n", __func__
, objname
);
1242 acpiphp_check_bridge(bridge
);
1245 case ACPI_NOTIFY_DEVICE_WAKE
:
1247 dbg("%s: Device wake notify on %s\n", __func__
, objname
);
1250 case ACPI_NOTIFY_EJECT_REQUEST
:
1251 /* request device eject */
1252 dbg("%s: Device eject notify on %s\n", __func__
, objname
);
1253 if ((bridge
->type
!= BRIDGE_TYPE_HOST
) &&
1254 (bridge
->flags
& BRIDGE_HAS_EJ0
)) {
1255 struct acpiphp_slot
*slot
;
1256 slot
= bridge
->func
->slot
;
1257 if (!acpiphp_disable_slot(slot
))
1258 acpiphp_eject_slot(slot
);
1262 case ACPI_NOTIFY_FREQUENCY_MISMATCH
:
1263 printk(KERN_ERR
"Device %s cannot be configured due"
1264 " to a frequency mismatch\n", objname
);
1267 case ACPI_NOTIFY_BUS_MODE_MISMATCH
:
1268 printk(KERN_ERR
"Device %s cannot be configured due"
1269 " to a bus mode mismatch\n", objname
);
1272 case ACPI_NOTIFY_POWER_FAULT
:
1273 printk(KERN_ERR
"Device %s has suffered a power fault\n",
1278 warn("notify_handler: unknown event type 0x%x for %s\n", type
, objname
);
1283 kfree(hp_work
); /* allocated in handle_hotplug_event_bridge */
1287 * handle_hotplug_event_bridge - handle ACPI event on bridges
1288 * @handle: Notify()'ed acpi_handle
1289 * @type: Notify code
1290 * @context: pointer to acpiphp_bridge structure
1292 * Handles ACPI event notification on {host,p2p} bridges.
1294 static void handle_hotplug_event_bridge(acpi_handle handle
, u32 type
,
1298 * Currently the code adds all hotplug events to the kacpid_wq
1299 * queue when it should add hotplug events to the kacpi_hotplug_wq.
1300 * The proper way to fix this is to reorganize the code so that
1301 * drivers (dock, etc.) do not call acpi_os_execute(), etc.
1302 * For now just re-add this work to the kacpi_hotplug_wq so we
1303 * don't deadlock on hotplug actions.
1305 alloc_acpiphp_hp_work(handle
, type
, context
,
1306 _handle_hotplug_event_bridge
);
1309 static void _handle_hotplug_event_func(struct work_struct
*work
)
1311 struct acpiphp_func
*func
;
1313 struct acpi_buffer buffer
= { .length
= sizeof(objname
),
1314 .pointer
= objname
};
1315 struct acpiphp_hp_work
*hp_work
;
1320 hp_work
= container_of(work
, struct acpiphp_hp_work
, work
);
1321 handle
= hp_work
->handle
;
1322 type
= hp_work
->type
;
1323 context
= hp_work
->context
;
1325 acpi_get_name(handle
, ACPI_FULL_PATHNAME
, &buffer
);
1327 func
= (struct acpiphp_func
*)context
;
1330 case ACPI_NOTIFY_BUS_CHECK
:
1331 /* bus re-enumerate */
1332 dbg("%s: Bus check notify on %s\n", __func__
, objname
);
1333 acpiphp_enable_slot(func
->slot
);
1336 case ACPI_NOTIFY_DEVICE_CHECK
:
1337 /* device check : re-enumerate from parent bus */
1338 dbg("%s: Device check notify on %s\n", __func__
, objname
);
1339 acpiphp_check_bridge(func
->slot
->bridge
);
1342 case ACPI_NOTIFY_DEVICE_WAKE
:
1344 dbg("%s: Device wake notify on %s\n", __func__
, objname
);
1347 case ACPI_NOTIFY_EJECT_REQUEST
:
1348 /* request device eject */
1349 dbg("%s: Device eject notify on %s\n", __func__
, objname
);
1350 if (!(acpiphp_disable_slot(func
->slot
)))
1351 acpiphp_eject_slot(func
->slot
);
1355 warn("notify_handler: unknown event type 0x%x for %s\n", type
, objname
);
1359 kfree(hp_work
); /* allocated in handle_hotplug_event_func */
1363 * handle_hotplug_event_func - handle ACPI event on functions (i.e. slots)
1364 * @handle: Notify()'ed acpi_handle
1365 * @type: Notify code
1366 * @context: pointer to acpiphp_func structure
1368 * Handles ACPI event notification on slots.
1370 static void handle_hotplug_event_func(acpi_handle handle
, u32 type
,
1374 * Currently the code adds all hotplug events to the kacpid_wq
1375 * queue when it should add hotplug events to the kacpi_hotplug_wq.
1376 * The proper way to fix this is to reorganize the code so that
1377 * drivers (dock, etc.) do not call acpi_os_execute(), etc.
1378 * For now just re-add this work to the kacpi_hotplug_wq so we
1379 * don't deadlock on hotplug actions.
1381 alloc_acpiphp_hp_work(handle
, type
, context
,
1382 _handle_hotplug_event_func
);
1386 find_root_bridges(acpi_handle handle
, u32 lvl
, void *context
, void **rv
)
1388 struct acpi_pci_root
*root
;
1389 int *count
= (int *)context
;
1391 if (!acpi_is_root_bridge(handle
))
1394 root
= acpi_pci_find_root(handle
);
1398 if (root
->osc_control_set
& OSC_PCI_NATIVE_HOTPLUG
)
1402 acpi_install_notify_handler(handle
, ACPI_SYSTEM_NOTIFY
,
1403 handle_hotplug_event_bridge
, NULL
);
1408 static struct acpi_pci_driver acpi_pci_hp_driver
= {
1410 .remove
= remove_bridge
,
1414 * acpiphp_glue_init - initializes all PCI hotplug - ACPI glue data structures
1416 int __init
acpiphp_glue_init(void)
1420 acpi_walk_namespace(ACPI_TYPE_DEVICE
, ACPI_ROOT_OBJECT
,
1421 ACPI_UINT32_MAX
, find_root_bridges
, NULL
, &num
, NULL
);
1426 acpi_pci_register_driver(&acpi_pci_hp_driver
);
1433 * acpiphp_glue_exit - terminates all PCI hotplug - ACPI glue data structures
1435 * This function frees all data allocated in acpiphp_glue_init().
1437 void acpiphp_glue_exit(void)
1439 acpi_pci_unregister_driver(&acpi_pci_hp_driver
);
1444 * acpiphp_get_num_slots - count number of slots in a system
1446 int __init
acpiphp_get_num_slots(void)
1448 struct acpiphp_bridge
*bridge
;
1451 list_for_each_entry(bridge
, &bridge_list
, list
) {
1452 dbg("Bus %04x:%02x has %d slot%s\n",
1453 pci_domain_nr(bridge
->pci_bus
),
1454 bridge
->pci_bus
->number
, bridge
->nr_slots
,
1455 bridge
->nr_slots
== 1 ? "" : "s");
1456 num_slots
+= bridge
->nr_slots
;
1459 dbg("Total %d slots\n", num_slots
);
1466 * acpiphp_for_each_slot - call function for each slot
1467 * @fn: callback function
1468 * @data: context to be passed to callback function
1470 static int acpiphp_for_each_slot(acpiphp_callback fn
, void *data
)
1472 struct list_head
*node
;
1473 struct acpiphp_bridge
*bridge
;
1474 struct acpiphp_slot
*slot
;
1477 list_for_each (node
, &bridge_list
) {
1478 bridge
= (struct acpiphp_bridge
*)node
;
1479 for (slot
= bridge
->slots
; slot
; slot
= slot
->next
) {
1480 retval
= fn(slot
, data
);
1493 * acpiphp_enable_slot - power on slot
1494 * @slot: ACPI PHP slot
1496 int acpiphp_enable_slot(struct acpiphp_slot
*slot
)
1500 mutex_lock(&slot
->crit_sect
);
1502 /* wake up all functions */
1503 retval
= power_on_slot(slot
);
1507 if (get_slot_status(slot
) == ACPI_STA_ALL
) {
1508 /* configure all functions */
1509 retval
= enable_device(slot
);
1511 power_off_slot(slot
);
1513 dbg("%s: Slot status is not ACPI_STA_ALL\n", __func__
);
1514 power_off_slot(slot
);
1518 mutex_unlock(&slot
->crit_sect
);
1523 * acpiphp_disable_slot - power off slot
1524 * @slot: ACPI PHP slot
1526 int acpiphp_disable_slot(struct acpiphp_slot
*slot
)
1530 mutex_lock(&slot
->crit_sect
);
1532 /* unconfigure all functions */
1533 retval
= disable_device(slot
);
1537 /* power off all functions */
1538 retval
= power_off_slot(slot
);
1543 mutex_unlock(&slot
->crit_sect
);
1552 u8
acpiphp_get_power_status(struct acpiphp_slot
*slot
)
1554 return (slot
->flags
& SLOT_POWEREDON
);
1562 u8
acpiphp_get_latch_status(struct acpiphp_slot
*slot
)
1566 sta
= get_slot_status(slot
);
1568 return (sta
& ACPI_STA_SHOW_IN_UI
) ? 0 : 1;
1573 * adapter presence : 1
1576 u8
acpiphp_get_adapter_status(struct acpiphp_slot
*slot
)
1580 sta
= get_slot_status(slot
);
1582 return (sta
== 0) ? 0 : 1;