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
->busn_res
.start
) {
104 buses
= (buses
& 0xff000000)
105 | ((unsigned int)(bus
->primary
) << 0)
106 | ((unsigned int)(bus
->busn_res
.start
) << 8)
107 | ((unsigned int)(bus
->busn_res
.end
) << 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 /* Check whether the PCI device is managed by native PCIe hotplug driver */
119 static bool device_is_managed_by_native_pciehp(struct pci_dev
*pdev
)
123 struct acpi_pci_root
*root
;
125 /* Check whether the PCIe port supports native PCIe hotplug */
126 if (pcie_capability_read_dword(pdev
, PCI_EXP_SLTCAP
, ®32
))
128 if (!(reg32
& PCI_EXP_SLTCAP_HPC
))
132 * Check whether native PCIe hotplug has been enabled for
133 * this PCIe hierarchy.
135 tmp
= acpi_find_root_bridge_handle(pdev
);
138 root
= acpi_pci_find_root(tmp
);
141 if (!(root
->osc_control_set
& OSC_PCI_EXPRESS_NATIVE_HP_CONTROL
))
147 /* callback routine to register each ACPI PCI slot object */
149 register_slot(acpi_handle handle
, u32 lvl
, void *context
, void **rv
)
151 struct acpiphp_bridge
*bridge
= (struct acpiphp_bridge
*)context
;
152 struct acpiphp_slot
*slot
;
153 struct acpiphp_func
*newfunc
;
155 acpi_status status
= AE_OK
;
156 unsigned long long adr
, sun
;
157 int device
, function
, retval
;
158 struct pci_bus
*pbus
= bridge
->pci_bus
;
159 struct pci_dev
*pdev
;
161 if (!acpi_pci_check_ejectable(pbus
, handle
) && !is_dock_device(handle
))
164 status
= acpi_evaluate_integer(handle
, "_ADR", NULL
, &adr
);
165 if (ACPI_FAILURE(status
)) {
166 warn("can't evaluate _ADR (%#x)\n", status
);
170 device
= (adr
>> 16) & 0xffff;
171 function
= adr
& 0xffff;
174 if (pdev
&& device_is_managed_by_native_pciehp(pdev
))
177 newfunc
= kzalloc(sizeof(struct acpiphp_func
), GFP_KERNEL
);
181 INIT_LIST_HEAD(&newfunc
->sibling
);
182 newfunc
->handle
= handle
;
183 newfunc
->function
= function
;
185 if (ACPI_SUCCESS(acpi_get_handle(handle
, "_EJ0", &tmp
)))
186 newfunc
->flags
= FUNC_HAS_EJ0
;
188 if (ACPI_SUCCESS(acpi_get_handle(handle
, "_STA", &tmp
)))
189 newfunc
->flags
|= FUNC_HAS_STA
;
191 if (ACPI_SUCCESS(acpi_get_handle(handle
, "_PS0", &tmp
)))
192 newfunc
->flags
|= FUNC_HAS_PS0
;
194 if (ACPI_SUCCESS(acpi_get_handle(handle
, "_PS3", &tmp
)))
195 newfunc
->flags
|= FUNC_HAS_PS3
;
197 if (ACPI_SUCCESS(acpi_get_handle(handle
, "_DCK", &tmp
)))
198 newfunc
->flags
|= FUNC_HAS_DCK
;
200 status
= acpi_evaluate_integer(handle
, "_SUN", NULL
, &sun
);
201 if (ACPI_FAILURE(status
)) {
203 * use the count of the number of slots we've found
204 * for the number of the slot
206 sun
= bridge
->nr_slots
+1;
209 /* search for objects that share the same slot */
210 for (slot
= bridge
->slots
; slot
; slot
= slot
->next
)
211 if (slot
->device
== device
) {
212 if (slot
->sun
!= sun
)
213 warn("sibling found, but _SUN doesn't match!\n");
218 slot
= kzalloc(sizeof(struct acpiphp_slot
), GFP_KERNEL
);
224 slot
->bridge
= bridge
;
225 slot
->device
= device
;
227 INIT_LIST_HEAD(&slot
->funcs
);
228 mutex_init(&slot
->crit_sect
);
230 slot
->next
= bridge
->slots
;
231 bridge
->slots
= slot
;
235 dbg("found ACPI PCI Hotplug slot %llu at PCI %04x:%02x:%02x\n",
236 slot
->sun
, pci_domain_nr(pbus
), pbus
->number
, device
);
237 retval
= acpiphp_register_hotplug_slot(slot
);
239 if (retval
== -EBUSY
)
240 warn("Slot %llu already registered by another "
241 "hotplug driver\n", slot
->sun
);
243 warn("acpiphp_register_hotplug_slot failed "
244 "(err code = 0x%x)\n", retval
);
249 newfunc
->slot
= slot
;
250 list_add_tail(&newfunc
->sibling
, &slot
->funcs
);
252 pdev
= pci_get_slot(pbus
, PCI_DEVFN(device
, function
));
254 slot
->flags
|= (SLOT_ENABLED
| SLOT_POWEREDON
);
258 if (is_dock_device(handle
)) {
259 /* we don't want to call this device's _EJ0
260 * because we want the dock notify handler
261 * to call it after it calls _DCK
263 newfunc
->flags
&= ~FUNC_HAS_EJ0
;
264 if (register_hotplug_dock_device(handle
,
265 &acpiphp_dock_ops
, newfunc
))
266 dbg("failed to register dock device\n");
268 /* we need to be notified when dock events happen
269 * outside of the hotplug operation, since we may
270 * need to do fixups before we can hotplug.
272 newfunc
->nb
.notifier_call
= post_dock_fixups
;
273 if (register_dock_notifier(&newfunc
->nb
))
274 dbg("failed to register a dock notifier");
277 /* install notify handler */
278 if (!(newfunc
->flags
& FUNC_HAS_DCK
)) {
279 status
= acpi_install_notify_handler(handle
,
281 handle_hotplug_event_func
,
284 if (ACPI_FAILURE(status
))
285 err("failed to register interrupt notify handler\n");
293 bridge
->slots
= slot
->next
;
301 /* see if it's worth looking at this bridge */
302 static int detect_ejectable_slots(acpi_handle handle
)
304 int found
= acpi_pci_detect_ejectable(handle
);
306 acpi_walk_namespace(ACPI_TYPE_DEVICE
, handle
, (u32
)1,
307 is_pci_dock_device
, NULL
, (void *)&found
, NULL
);
312 /* initialize miscellaneous stuff for both root and PCI-to-PCI bridge */
313 static void init_bridge_misc(struct acpiphp_bridge
*bridge
)
317 /* must be added to the list prior to calling register_slot */
318 list_add(&bridge
->list
, &bridge_list
);
320 /* register all slot objects under this bridge */
321 status
= acpi_walk_namespace(ACPI_TYPE_DEVICE
, bridge
->handle
, (u32
)1,
322 register_slot
, NULL
, bridge
, NULL
);
323 if (ACPI_FAILURE(status
)) {
324 list_del(&bridge
->list
);
328 /* install notify handler */
329 if (bridge
->type
!= BRIDGE_TYPE_HOST
) {
330 if ((bridge
->flags
& BRIDGE_HAS_EJ0
) && bridge
->func
) {
331 status
= acpi_remove_notify_handler(bridge
->func
->handle
,
333 handle_hotplug_event_func
);
334 if (ACPI_FAILURE(status
))
335 err("failed to remove notify handler\n");
337 status
= acpi_install_notify_handler(bridge
->handle
,
339 handle_hotplug_event_bridge
,
342 if (ACPI_FAILURE(status
)) {
343 err("failed to register interrupt notify handler\n");
349 /* find acpiphp_func from acpiphp_bridge */
350 static struct acpiphp_func
*acpiphp_bridge_handle_to_function(acpi_handle handle
)
352 struct acpiphp_bridge
*bridge
;
353 struct acpiphp_slot
*slot
;
354 struct acpiphp_func
*func
;
356 list_for_each_entry(bridge
, &bridge_list
, list
) {
357 for (slot
= bridge
->slots
; slot
; slot
= slot
->next
) {
358 list_for_each_entry(func
, &slot
->funcs
, sibling
) {
359 if (func
->handle
== handle
)
369 static inline void config_p2p_bridge_flags(struct acpiphp_bridge
*bridge
)
371 acpi_handle dummy_handle
;
373 if (ACPI_SUCCESS(acpi_get_handle(bridge
->handle
,
374 "_STA", &dummy_handle
)))
375 bridge
->flags
|= BRIDGE_HAS_STA
;
377 if (ACPI_SUCCESS(acpi_get_handle(bridge
->handle
,
378 "_EJ0", &dummy_handle
)))
379 bridge
->flags
|= BRIDGE_HAS_EJ0
;
381 if (ACPI_SUCCESS(acpi_get_handle(bridge
->handle
,
382 "_PS0", &dummy_handle
)))
383 bridge
->flags
|= BRIDGE_HAS_PS0
;
385 if (ACPI_SUCCESS(acpi_get_handle(bridge
->handle
,
386 "_PS3", &dummy_handle
)))
387 bridge
->flags
|= BRIDGE_HAS_PS3
;
389 /* is this ejectable p2p bridge? */
390 if (bridge
->flags
& BRIDGE_HAS_EJ0
) {
391 struct acpiphp_func
*func
;
393 dbg("found ejectable p2p bridge\n");
395 /* make link between PCI bridge and PCI function */
396 func
= acpiphp_bridge_handle_to_function(bridge
->handle
);
400 func
->bridge
= bridge
;
405 /* allocate and initialize host bridge data structure */
406 static void add_host_bridge(struct acpi_pci_root
*root
)
408 struct acpiphp_bridge
*bridge
;
409 acpi_handle handle
= root
->device
->handle
;
411 bridge
= kzalloc(sizeof(struct acpiphp_bridge
), GFP_KERNEL
);
415 bridge
->type
= BRIDGE_TYPE_HOST
;
416 bridge
->handle
= handle
;
418 bridge
->pci_bus
= root
->bus
;
420 init_bridge_misc(bridge
);
424 /* allocate and initialize PCI-to-PCI bridge data structure */
425 static void add_p2p_bridge(acpi_handle
*handle
)
427 struct acpiphp_bridge
*bridge
;
429 bridge
= kzalloc(sizeof(struct acpiphp_bridge
), GFP_KERNEL
);
430 if (bridge
== NULL
) {
431 err("out of memory\n");
435 bridge
->type
= BRIDGE_TYPE_P2P
;
436 bridge
->handle
= handle
;
437 config_p2p_bridge_flags(bridge
);
439 bridge
->pci_dev
= acpi_get_pci_dev(handle
);
440 bridge
->pci_bus
= bridge
->pci_dev
->subordinate
;
441 if (!bridge
->pci_bus
) {
442 err("This is not a PCI-to-PCI bridge!\n");
447 * Grab a ref to the subordinate PCI bus in case the bus is
448 * removed via PCI core logical hotplug. The ref pins the bus
449 * (which we access during module unload).
451 get_device(&bridge
->pci_bus
->dev
);
453 init_bridge_misc(bridge
);
456 pci_dev_put(bridge
->pci_dev
);
462 /* callback routine to find P2P bridges */
464 find_p2p_bridge(acpi_handle handle
, u32 lvl
, void *context
, void **rv
)
469 dev
= acpi_get_pci_dev(handle
);
470 if (!dev
|| !dev
->subordinate
)
473 /* check if this bridge has ejectable slots */
474 if ((detect_ejectable_slots(handle
) > 0)) {
475 dbg("found PCI-to-PCI bridge at PCI %s\n", pci_name(dev
));
476 add_p2p_bridge(handle
);
479 /* search P2P bridges under this p2p bridge */
480 status
= acpi_walk_namespace(ACPI_TYPE_DEVICE
, handle
, (u32
)1,
481 find_p2p_bridge
, NULL
, NULL
, NULL
);
482 if (ACPI_FAILURE(status
))
483 warn("find_p2p_bridge failed (error code = 0x%x)\n", status
);
491 /* find hot-pluggable slots, and then find P2P bridge */
492 static int add_bridge(struct acpi_pci_root
*root
)
495 unsigned long long tmp
;
496 acpi_handle dummy_handle
;
497 acpi_handle handle
= root
->device
->handle
;
499 /* if the bridge doesn't have _STA, we assume it is always there */
500 status
= acpi_get_handle(handle
, "_STA", &dummy_handle
);
501 if (ACPI_SUCCESS(status
)) {
502 status
= acpi_evaluate_integer(handle
, "_STA", NULL
, &tmp
);
503 if (ACPI_FAILURE(status
)) {
504 dbg("%s: _STA evaluation failure\n", __func__
);
507 if ((tmp
& ACPI_STA_FUNCTIONING
) == 0)
508 /* don't register this object */
512 /* check if this bridge has ejectable slots */
513 if (detect_ejectable_slots(handle
) > 0) {
514 dbg("found PCI host-bus bridge with hot-pluggable slots\n");
515 add_host_bridge(root
);
518 /* search P2P bridges under this host bridge */
519 status
= acpi_walk_namespace(ACPI_TYPE_DEVICE
, handle
, (u32
)1,
520 find_p2p_bridge
, NULL
, NULL
, NULL
);
522 if (ACPI_FAILURE(status
))
523 warn("find_p2p_bridge failed (error code = 0x%x)\n", status
);
528 static struct acpiphp_bridge
*acpiphp_handle_to_bridge(acpi_handle handle
)
530 struct acpiphp_bridge
*bridge
;
532 list_for_each_entry(bridge
, &bridge_list
, list
)
533 if (bridge
->handle
== handle
)
539 static void cleanup_bridge(struct acpiphp_bridge
*bridge
)
541 struct acpiphp_slot
*slot
, *next
;
542 struct acpiphp_func
*func
, *tmp
;
544 acpi_handle handle
= bridge
->handle
;
546 status
= acpi_remove_notify_handler(handle
, ACPI_SYSTEM_NOTIFY
,
547 handle_hotplug_event_bridge
);
548 if (ACPI_FAILURE(status
))
549 err("failed to remove notify handler\n");
551 if ((bridge
->type
!= BRIDGE_TYPE_HOST
) &&
552 ((bridge
->flags
& BRIDGE_HAS_EJ0
) && bridge
->func
)) {
553 status
= acpi_install_notify_handler(bridge
->func
->handle
,
555 handle_hotplug_event_func
,
557 if (ACPI_FAILURE(status
))
558 err("failed to install interrupt notify handler\n");
561 slot
= bridge
->slots
;
564 list_for_each_entry_safe(func
, tmp
, &slot
->funcs
, sibling
) {
565 if (is_dock_device(func
->handle
)) {
566 unregister_hotplug_dock_device(func
->handle
);
567 unregister_dock_notifier(&func
->nb
);
569 if (!(func
->flags
& FUNC_HAS_DCK
)) {
570 status
= acpi_remove_notify_handler(func
->handle
,
572 handle_hotplug_event_func
);
573 if (ACPI_FAILURE(status
))
574 err("failed to remove notify handler\n");
576 list_del(&func
->sibling
);
579 acpiphp_unregister_hotplug_slot(slot
);
580 list_del(&slot
->funcs
);
586 * Only P2P bridges have a pci_dev
589 put_device(&bridge
->pci_bus
->dev
);
591 pci_dev_put(bridge
->pci_dev
);
592 list_del(&bridge
->list
);
597 cleanup_p2p_bridge(acpi_handle handle
, u32 lvl
, void *context
, void **rv
)
599 struct acpiphp_bridge
*bridge
;
601 /* cleanup p2p bridges under this P2P bridge
602 in a depth-first manner */
603 acpi_walk_namespace(ACPI_TYPE_DEVICE
, handle
, (u32
)1,
604 cleanup_p2p_bridge
, NULL
, NULL
, NULL
);
606 bridge
= acpiphp_handle_to_bridge(handle
);
608 cleanup_bridge(bridge
);
613 static void remove_bridge(struct acpi_pci_root
*root
)
615 struct acpiphp_bridge
*bridge
;
616 acpi_handle handle
= root
->device
->handle
;
618 /* cleanup p2p bridges under this host bridge
619 in a depth-first manner */
620 acpi_walk_namespace(ACPI_TYPE_DEVICE
, handle
,
621 (u32
)1, cleanup_p2p_bridge
, NULL
, NULL
, NULL
);
624 * On root bridges with hotplug slots directly underneath (ie,
625 * no p2p bridge between), we call cleanup_bridge().
627 * The else clause cleans up root bridges that either had no
628 * hotplug slots at all, or had a p2p bridge underneath.
630 bridge
= acpiphp_handle_to_bridge(handle
);
632 cleanup_bridge(bridge
);
634 acpi_remove_notify_handler(handle
, ACPI_SYSTEM_NOTIFY
,
635 handle_hotplug_event_bridge
);
638 static int power_on_slot(struct acpiphp_slot
*slot
)
641 struct acpiphp_func
*func
;
644 /* if already enabled, just skip */
645 if (slot
->flags
& SLOT_POWEREDON
)
648 list_for_each_entry(func
, &slot
->funcs
, sibling
) {
649 if (func
->flags
& FUNC_HAS_PS0
) {
650 dbg("%s: executing _PS0\n", __func__
);
651 status
= acpi_evaluate_object(func
->handle
, "_PS0", NULL
, NULL
);
652 if (ACPI_FAILURE(status
)) {
653 warn("%s: _PS0 failed\n", __func__
);
661 /* TBD: evaluate _STA to check if the slot is enabled */
663 slot
->flags
|= SLOT_POWEREDON
;
670 static int power_off_slot(struct acpiphp_slot
*slot
)
673 struct acpiphp_func
*func
;
677 /* if already disabled, just skip */
678 if ((slot
->flags
& SLOT_POWEREDON
) == 0)
681 list_for_each_entry(func
, &slot
->funcs
, sibling
) {
682 if (func
->flags
& FUNC_HAS_PS3
) {
683 status
= acpi_evaluate_object(func
->handle
, "_PS3", NULL
, NULL
);
684 if (ACPI_FAILURE(status
)) {
685 warn("%s: _PS3 failed\n", __func__
);
693 /* TBD: evaluate _STA to check if the slot is disabled */
695 slot
->flags
&= (~SLOT_POWEREDON
);
704 * acpiphp_max_busnr - return the highest reserved bus number under the given bus.
705 * @bus: bus to start search with
707 static unsigned char acpiphp_max_busnr(struct pci_bus
*bus
)
709 struct list_head
*tmp
;
710 unsigned char max
, n
;
713 * pci_bus_max_busnr will return the highest
714 * reserved busnr for all these children.
715 * that is equivalent to the bus->subordinate
716 * value. We don't want to use the parent's
717 * bus->subordinate value because it could have
720 max
= bus
->busn_res
.start
;
722 list_for_each(tmp
, &bus
->children
) {
723 n
= pci_bus_max_busnr(pci_bus_b(tmp
));
732 * acpiphp_bus_add - add a new bus to acpi subsystem
733 * @func: acpiphp_func of the bridge
735 static int acpiphp_bus_add(struct acpiphp_func
*func
)
737 struct acpi_device
*device
;
740 if (!acpi_bus_get_device(func
->handle
, &device
)) {
741 dbg("bus exists... trim\n");
742 /* this shouldn't be in here, so remove
743 * the bus then re-add it...
745 ret_val
= acpi_bus_trim(device
);
746 dbg("acpi_bus_trim return %x\n", ret_val
);
749 ret_val
= acpi_bus_scan(func
->handle
);
751 ret_val
= acpi_bus_get_device(func
->handle
, &device
);
754 dbg("error adding bus, %x\n", -ret_val
);
761 * acpiphp_bus_trim - trim a bus from acpi subsystem
762 * @handle: handle to acpi namespace
764 static int acpiphp_bus_trim(acpi_handle handle
)
766 struct acpi_device
*device
;
769 retval
= acpi_bus_get_device(handle
, &device
);
771 dbg("acpi_device not found\n");
775 retval
= acpi_bus_trim(device
);
777 err("cannot remove from acpi list\n");
782 static void acpiphp_set_acpi_region(struct acpiphp_slot
*slot
)
784 struct acpiphp_func
*func
;
785 union acpi_object params
[2];
786 struct acpi_object_list arg_list
;
788 list_for_each_entry(func
, &slot
->funcs
, sibling
) {
790 arg_list
.pointer
= params
;
791 params
[0].type
= ACPI_TYPE_INTEGER
;
792 params
[0].integer
.value
= ACPI_ADR_SPACE_PCI_CONFIG
;
793 params
[1].type
= ACPI_TYPE_INTEGER
;
794 params
[1].integer
.value
= 1;
795 /* _REG is optional, we don't care about if there is failure */
796 acpi_evaluate_object(func
->handle
, "_REG", &arg_list
, NULL
);
800 static void check_hotplug_bridge(struct acpiphp_slot
*slot
, struct pci_dev
*dev
)
802 struct acpiphp_func
*func
;
804 if (!dev
->subordinate
)
807 /* quirk, or pcie could set it already */
808 if (dev
->is_hotplug_bridge
)
811 if (PCI_SLOT(dev
->devfn
) != slot
->device
)
814 list_for_each_entry(func
, &slot
->funcs
, sibling
) {
815 if (PCI_FUNC(dev
->devfn
) == func
->function
) {
816 /* check if this bridge has ejectable slots */
817 if ((detect_ejectable_slots(func
->handle
) > 0))
818 dev
->is_hotplug_bridge
= 1;
824 * enable_device - enable, configure a slot
825 * @slot: slot to be enabled
827 * This function should be called per *physical slot*,
828 * not per each slot object in ACPI namespace.
830 static int __ref
enable_device(struct acpiphp_slot
*slot
)
833 struct pci_bus
*bus
= slot
->bridge
->pci_bus
;
834 struct acpiphp_func
*func
;
839 if (slot
->flags
& SLOT_ENABLED
)
842 num
= pci_scan_slot(bus
, PCI_DEVFN(slot
->device
, 0));
844 /* Maybe only part of funcs are added. */
845 dbg("No new device found\n");
849 max
= acpiphp_max_busnr(bus
);
850 for (pass
= 0; pass
< 2; pass
++) {
851 list_for_each_entry(dev
, &bus
->devices
, bus_list
) {
852 if (PCI_SLOT(dev
->devfn
) != slot
->device
)
854 if (dev
->hdr_type
== PCI_HEADER_TYPE_BRIDGE
||
855 dev
->hdr_type
== PCI_HEADER_TYPE_CARDBUS
) {
856 max
= pci_scan_bridge(bus
, dev
, max
, pass
);
857 if (pass
&& dev
->subordinate
) {
858 check_hotplug_bridge(slot
, dev
);
859 pci_bus_size_bridges(dev
->subordinate
);
865 list_for_each_entry(func
, &slot
->funcs
, sibling
)
866 acpiphp_bus_add(func
);
868 pci_bus_assign_resources(bus
);
869 acpiphp_sanitize_bus(bus
);
870 acpiphp_set_hpp_values(bus
);
871 acpiphp_set_acpi_region(slot
);
872 pci_enable_bridges(bus
);
874 list_for_each_entry(dev
, &bus
->devices
, bus_list
) {
875 /* Assume that newly added devices are powered on already. */
877 dev
->current_state
= PCI_D0
;
880 pci_bus_add_devices(bus
);
882 slot
->flags
|= SLOT_ENABLED
;
883 list_for_each_entry(func
, &slot
->funcs
, sibling
) {
884 dev
= pci_get_slot(bus
, PCI_DEVFN(slot
->device
,
887 /* Do not set SLOT_ENABLED flag if some funcs
889 slot
->flags
&= (~SLOT_ENABLED
);
893 if (dev
->hdr_type
!= PCI_HEADER_TYPE_BRIDGE
&&
894 dev
->hdr_type
!= PCI_HEADER_TYPE_CARDBUS
) {
899 status
= find_p2p_bridge(func
->handle
, (u32
)1, bus
, NULL
);
900 if (ACPI_FAILURE(status
))
901 warn("find_p2p_bridge failed (error code = 0x%x)\n",
911 /* return first device in slot, acquiring a reference on it */
912 static struct pci_dev
*dev_in_slot(struct acpiphp_slot
*slot
)
914 struct pci_bus
*bus
= slot
->bridge
->pci_bus
;
916 struct pci_dev
*ret
= NULL
;
918 down_read(&pci_bus_sem
);
919 list_for_each_entry(dev
, &bus
->devices
, bus_list
)
920 if (PCI_SLOT(dev
->devfn
) == slot
->device
) {
921 ret
= pci_dev_get(dev
);
924 up_read(&pci_bus_sem
);
930 * disable_device - disable a slot
931 * @slot: ACPI PHP slot
933 static int disable_device(struct acpiphp_slot
*slot
)
935 struct acpiphp_func
*func
;
936 struct pci_dev
*pdev
;
937 struct pci_bus
*bus
= slot
->bridge
->pci_bus
;
939 /* The slot will be enabled when func 0 is added, so check
940 func 0 before disable the slot. */
941 pdev
= pci_get_slot(bus
, PCI_DEVFN(slot
->device
, 0));
946 list_for_each_entry(func
, &slot
->funcs
, sibling
) {
948 /* cleanup p2p bridges under this P2P bridge */
949 cleanup_p2p_bridge(func
->bridge
->handle
,
956 * enable_device() enumerates all functions in this device via
957 * pci_scan_slot(), whether they have associated ACPI hotplug
958 * methods (_EJ0, etc.) or not. Therefore, we remove all functions
961 while ((pdev
= dev_in_slot(slot
))) {
962 pci_stop_and_remove_bus_device(pdev
);
966 list_for_each_entry(func
, &slot
->funcs
, sibling
) {
967 acpiphp_bus_trim(func
->handle
);
970 slot
->flags
&= (~SLOT_ENABLED
);
978 * get_slot_status - get ACPI slot status
979 * @slot: ACPI PHP slot
981 * If a slot has _STA for each function and if any one of them
982 * returned non-zero status, return it.
984 * If a slot doesn't have _STA and if any one of its functions'
985 * configuration space is configured, return 0x0f as a _STA.
987 * Otherwise return 0.
989 static unsigned int get_slot_status(struct acpiphp_slot
*slot
)
992 unsigned long long sta
= 0;
994 struct acpiphp_func
*func
;
996 list_for_each_entry(func
, &slot
->funcs
, sibling
) {
997 if (func
->flags
& FUNC_HAS_STA
) {
998 status
= acpi_evaluate_integer(func
->handle
, "_STA", NULL
, &sta
);
999 if (ACPI_SUCCESS(status
) && sta
)
1002 pci_bus_read_config_dword(slot
->bridge
->pci_bus
,
1003 PCI_DEVFN(slot
->device
,
1005 PCI_VENDOR_ID
, &dvid
);
1006 if (dvid
!= 0xffffffff) {
1013 return (unsigned int)sta
;
1017 * acpiphp_eject_slot - physically eject the slot
1018 * @slot: ACPI PHP slot
1020 int acpiphp_eject_slot(struct acpiphp_slot
*slot
)
1023 struct acpiphp_func
*func
;
1024 struct acpi_object_list arg_list
;
1025 union acpi_object arg
;
1027 list_for_each_entry(func
, &slot
->funcs
, sibling
) {
1028 /* We don't want to call _EJ0 on non-existing functions. */
1029 if ((func
->flags
& FUNC_HAS_EJ0
)) {
1030 /* _EJ0 method take one argument */
1032 arg_list
.pointer
= &arg
;
1033 arg
.type
= ACPI_TYPE_INTEGER
;
1034 arg
.integer
.value
= 1;
1036 status
= acpi_evaluate_object(func
->handle
, "_EJ0", &arg_list
, NULL
);
1037 if (ACPI_FAILURE(status
)) {
1038 warn("%s: _EJ0 failed\n", __func__
);
1048 * acpiphp_check_bridge - re-enumerate devices
1049 * @bridge: where to begin re-enumeration
1051 * Iterate over all slots under this bridge and make sure that if a
1052 * card is present they are enabled, and if not they are disabled.
1054 static int acpiphp_check_bridge(struct acpiphp_bridge
*bridge
)
1056 struct acpiphp_slot
*slot
;
1058 int enabled
, disabled
;
1060 enabled
= disabled
= 0;
1062 for (slot
= bridge
->slots
; slot
; slot
= slot
->next
) {
1063 unsigned int status
= get_slot_status(slot
);
1064 if (slot
->flags
& SLOT_ENABLED
) {
1065 if (status
== ACPI_STA_ALL
)
1067 retval
= acpiphp_disable_slot(slot
);
1069 err("Error occurred in disabling\n");
1072 acpiphp_eject_slot(slot
);
1076 if (status
!= ACPI_STA_ALL
)
1078 retval
= acpiphp_enable_slot(slot
);
1080 err("Error occurred in enabling\n");
1087 dbg("%s: %d enabled, %d disabled\n", __func__
, enabled
, disabled
);
1093 static void acpiphp_set_hpp_values(struct pci_bus
*bus
)
1095 struct pci_dev
*dev
;
1097 list_for_each_entry(dev
, &bus
->devices
, bus_list
)
1098 pci_configure_slot(dev
);
1102 * Remove devices for which we could not assign resources, call
1103 * arch specific code to fix-up the bus
1105 static void acpiphp_sanitize_bus(struct pci_bus
*bus
)
1107 struct pci_dev
*dev
;
1109 unsigned long type_mask
= IORESOURCE_IO
| IORESOURCE_MEM
;
1111 list_for_each_entry(dev
, &bus
->devices
, bus_list
) {
1112 for (i
=0; i
<PCI_BRIDGE_RESOURCES
; i
++) {
1113 struct resource
*res
= &dev
->resource
[i
];
1114 if ((res
->flags
& type_mask
) && !res
->start
&&
1116 /* Could not assign a required resources
1117 * for this device, remove it */
1118 pci_stop_and_remove_bus_device(dev
);
1125 /* Program resources in newly inserted bridge */
1126 static int acpiphp_configure_bridge (acpi_handle handle
)
1128 struct pci_bus
*bus
;
1130 if (acpi_is_root_bridge(handle
)) {
1131 struct acpi_pci_root
*root
= acpi_pci_find_root(handle
);
1134 struct pci_dev
*pdev
= acpi_get_pci_dev(handle
);
1135 bus
= pdev
->subordinate
;
1139 pci_bus_size_bridges(bus
);
1140 pci_bus_assign_resources(bus
);
1141 acpiphp_sanitize_bus(bus
);
1142 acpiphp_set_hpp_values(bus
);
1143 pci_enable_bridges(bus
);
1147 static void handle_bridge_insertion(acpi_handle handle
, u32 type
)
1149 struct acpi_device
*device
;
1151 if ((type
!= ACPI_NOTIFY_BUS_CHECK
) &&
1152 (type
!= ACPI_NOTIFY_DEVICE_CHECK
)) {
1153 err("unexpected notification type %d\n", type
);
1157 if (acpi_bus_scan(handle
)) {
1158 err("cannot add bridge to acpi list\n");
1161 if (acpi_bus_get_device(handle
, &device
)) {
1162 err("ACPI device object missing\n");
1165 if (!acpiphp_configure_bridge(handle
))
1168 err("cannot configure and start bridge\n");
1173 * ACPI event handlers
1177 count_sub_bridges(acpi_handle handle
, u32 lvl
, void *context
, void **rv
)
1179 int *count
= (int *)context
;
1180 struct acpiphp_bridge
*bridge
;
1182 bridge
= acpiphp_handle_to_bridge(handle
);
1189 check_sub_bridges(acpi_handle handle
, u32 lvl
, void *context
, void **rv
)
1191 struct acpiphp_bridge
*bridge
;
1193 struct acpi_buffer buffer
= { .length
= sizeof(objname
),
1194 .pointer
= objname
};
1196 bridge
= acpiphp_handle_to_bridge(handle
);
1198 acpi_get_name(handle
, ACPI_FULL_PATHNAME
, &buffer
);
1199 dbg("%s: re-enumerating slots under %s\n",
1201 acpiphp_check_bridge(bridge
);
1206 static void _handle_hotplug_event_bridge(struct work_struct
*work
)
1208 struct acpiphp_bridge
*bridge
;
1210 struct acpi_buffer buffer
= { .length
= sizeof(objname
),
1211 .pointer
= objname
};
1212 struct acpi_device
*device
;
1213 int num_sub_bridges
= 0;
1214 struct acpi_hp_work
*hp_work
;
1218 hp_work
= container_of(work
, struct acpi_hp_work
, work
);
1219 handle
= hp_work
->handle
;
1220 type
= hp_work
->type
;
1222 if (acpi_bus_get_device(handle
, &device
)) {
1223 /* This bridge must have just been physically inserted */
1224 handle_bridge_insertion(handle
, type
);
1228 bridge
= acpiphp_handle_to_bridge(handle
);
1229 if (type
== ACPI_NOTIFY_BUS_CHECK
) {
1230 acpi_walk_namespace(ACPI_TYPE_DEVICE
, handle
, ACPI_UINT32_MAX
,
1231 count_sub_bridges
, NULL
, &num_sub_bridges
, NULL
);
1234 if (!bridge
&& !num_sub_bridges
) {
1235 err("cannot get bridge info\n");
1239 acpi_get_name(handle
, ACPI_FULL_PATHNAME
, &buffer
);
1242 case ACPI_NOTIFY_BUS_CHECK
:
1243 /* bus re-enumerate */
1244 dbg("%s: Bus check notify on %s\n", __func__
, objname
);
1246 dbg("%s: re-enumerating slots under %s\n",
1248 acpiphp_check_bridge(bridge
);
1250 if (num_sub_bridges
)
1251 acpi_walk_namespace(ACPI_TYPE_DEVICE
, handle
,
1252 ACPI_UINT32_MAX
, check_sub_bridges
, NULL
, NULL
, NULL
);
1255 case ACPI_NOTIFY_DEVICE_CHECK
:
1257 dbg("%s: Device check notify on %s\n", __func__
, objname
);
1258 acpiphp_check_bridge(bridge
);
1261 case ACPI_NOTIFY_DEVICE_WAKE
:
1263 dbg("%s: Device wake notify on %s\n", __func__
, objname
);
1266 case ACPI_NOTIFY_EJECT_REQUEST
:
1267 /* request device eject */
1268 dbg("%s: Device eject notify on %s\n", __func__
, objname
);
1269 if ((bridge
->type
!= BRIDGE_TYPE_HOST
) &&
1270 (bridge
->flags
& BRIDGE_HAS_EJ0
)) {
1271 struct acpiphp_slot
*slot
;
1272 slot
= bridge
->func
->slot
;
1273 if (!acpiphp_disable_slot(slot
))
1274 acpiphp_eject_slot(slot
);
1278 case ACPI_NOTIFY_FREQUENCY_MISMATCH
:
1279 printk(KERN_ERR
"Device %s cannot be configured due"
1280 " to a frequency mismatch\n", objname
);
1283 case ACPI_NOTIFY_BUS_MODE_MISMATCH
:
1284 printk(KERN_ERR
"Device %s cannot be configured due"
1285 " to a bus mode mismatch\n", objname
);
1288 case ACPI_NOTIFY_POWER_FAULT
:
1289 printk(KERN_ERR
"Device %s has suffered a power fault\n",
1294 warn("notify_handler: unknown event type 0x%x for %s\n", type
, objname
);
1299 kfree(hp_work
); /* allocated in handle_hotplug_event_bridge */
1303 * handle_hotplug_event_bridge - handle ACPI event on bridges
1304 * @handle: Notify()'ed acpi_handle
1305 * @type: Notify code
1306 * @context: pointer to acpiphp_bridge structure
1308 * Handles ACPI event notification on {host,p2p} bridges.
1310 static void handle_hotplug_event_bridge(acpi_handle handle
, u32 type
,
1314 * Currently the code adds all hotplug events to the kacpid_wq
1315 * queue when it should add hotplug events to the kacpi_hotplug_wq.
1316 * The proper way to fix this is to reorganize the code so that
1317 * drivers (dock, etc.) do not call acpi_os_execute(), etc.
1318 * For now just re-add this work to the kacpi_hotplug_wq so we
1319 * don't deadlock on hotplug actions.
1321 alloc_acpi_hp_work(handle
, type
, context
, _handle_hotplug_event_bridge
);
1324 static void _handle_hotplug_event_func(struct work_struct
*work
)
1326 struct acpiphp_func
*func
;
1328 struct acpi_buffer buffer
= { .length
= sizeof(objname
),
1329 .pointer
= objname
};
1330 struct acpi_hp_work
*hp_work
;
1335 hp_work
= container_of(work
, struct acpi_hp_work
, work
);
1336 handle
= hp_work
->handle
;
1337 type
= hp_work
->type
;
1338 context
= hp_work
->context
;
1340 acpi_get_name(handle
, ACPI_FULL_PATHNAME
, &buffer
);
1342 func
= (struct acpiphp_func
*)context
;
1345 case ACPI_NOTIFY_BUS_CHECK
:
1346 /* bus re-enumerate */
1347 dbg("%s: Bus check notify on %s\n", __func__
, objname
);
1348 acpiphp_enable_slot(func
->slot
);
1351 case ACPI_NOTIFY_DEVICE_CHECK
:
1352 /* device check : re-enumerate from parent bus */
1353 dbg("%s: Device check notify on %s\n", __func__
, objname
);
1354 acpiphp_check_bridge(func
->slot
->bridge
);
1357 case ACPI_NOTIFY_DEVICE_WAKE
:
1359 dbg("%s: Device wake notify on %s\n", __func__
, objname
);
1362 case ACPI_NOTIFY_EJECT_REQUEST
:
1363 /* request device eject */
1364 dbg("%s: Device eject notify on %s\n", __func__
, objname
);
1365 if (!(acpiphp_disable_slot(func
->slot
)))
1366 acpiphp_eject_slot(func
->slot
);
1370 warn("notify_handler: unknown event type 0x%x for %s\n", type
, objname
);
1374 kfree(hp_work
); /* allocated in handle_hotplug_event_func */
1378 * handle_hotplug_event_func - handle ACPI event on functions (i.e. slots)
1379 * @handle: Notify()'ed acpi_handle
1380 * @type: Notify code
1381 * @context: pointer to acpiphp_func structure
1383 * Handles ACPI event notification on slots.
1385 static void handle_hotplug_event_func(acpi_handle handle
, u32 type
,
1389 * Currently the code adds all hotplug events to the kacpid_wq
1390 * queue when it should add hotplug events to the kacpi_hotplug_wq.
1391 * The proper way to fix this is to reorganize the code so that
1392 * drivers (dock, etc.) do not call acpi_os_execute(), etc.
1393 * For now just re-add this work to the kacpi_hotplug_wq so we
1394 * don't deadlock on hotplug actions.
1396 alloc_acpi_hp_work(handle
, type
, context
, _handle_hotplug_event_func
);
1400 find_root_bridges(acpi_handle handle
, u32 lvl
, void *context
, void **rv
)
1402 int *count
= (int *)context
;
1404 if (!acpi_is_root_bridge(handle
))
1408 acpi_install_notify_handler(handle
, ACPI_SYSTEM_NOTIFY
,
1409 handle_hotplug_event_bridge
, NULL
);
1414 static struct acpi_pci_driver acpi_pci_hp_driver
= {
1416 .remove
= remove_bridge
,
1420 * acpiphp_glue_init - initializes all PCI hotplug - ACPI glue data structures
1422 int __init
acpiphp_glue_init(void)
1426 acpi_walk_namespace(ACPI_TYPE_DEVICE
, ACPI_ROOT_OBJECT
,
1427 ACPI_UINT32_MAX
, find_root_bridges
, NULL
, &num
, NULL
);
1432 acpi_pci_register_driver(&acpi_pci_hp_driver
);
1439 * acpiphp_glue_exit - terminates all PCI hotplug - ACPI glue data structures
1441 * This function frees all data allocated in acpiphp_glue_init().
1443 void acpiphp_glue_exit(void)
1445 acpi_pci_unregister_driver(&acpi_pci_hp_driver
);
1450 * acpiphp_get_num_slots - count number of slots in a system
1452 int __init
acpiphp_get_num_slots(void)
1454 struct acpiphp_bridge
*bridge
;
1457 list_for_each_entry(bridge
, &bridge_list
, list
) {
1458 dbg("Bus %04x:%02x has %d slot%s\n",
1459 pci_domain_nr(bridge
->pci_bus
),
1460 bridge
->pci_bus
->number
, bridge
->nr_slots
,
1461 bridge
->nr_slots
== 1 ? "" : "s");
1462 num_slots
+= bridge
->nr_slots
;
1465 dbg("Total %d slots\n", num_slots
);
1471 * acpiphp_enable_slot - power on slot
1472 * @slot: ACPI PHP slot
1474 int acpiphp_enable_slot(struct acpiphp_slot
*slot
)
1478 mutex_lock(&slot
->crit_sect
);
1480 /* wake up all functions */
1481 retval
= power_on_slot(slot
);
1485 if (get_slot_status(slot
) == ACPI_STA_ALL
) {
1486 /* configure all functions */
1487 retval
= enable_device(slot
);
1489 power_off_slot(slot
);
1491 dbg("%s: Slot status is not ACPI_STA_ALL\n", __func__
);
1492 power_off_slot(slot
);
1496 mutex_unlock(&slot
->crit_sect
);
1501 * acpiphp_disable_slot - power off slot
1502 * @slot: ACPI PHP slot
1504 int acpiphp_disable_slot(struct acpiphp_slot
*slot
)
1508 mutex_lock(&slot
->crit_sect
);
1510 /* unconfigure all functions */
1511 retval
= disable_device(slot
);
1515 /* power off all functions */
1516 retval
= power_off_slot(slot
);
1521 mutex_unlock(&slot
->crit_sect
);
1530 u8
acpiphp_get_power_status(struct acpiphp_slot
*slot
)
1532 return (slot
->flags
& SLOT_POWEREDON
);
1540 u8
acpiphp_get_latch_status(struct acpiphp_slot
*slot
)
1544 sta
= get_slot_status(slot
);
1546 return (sta
& ACPI_STA_SHOW_IN_UI
) ? 0 : 1;
1551 * adapter presence : 1
1554 u8
acpiphp_get_adapter_status(struct acpiphp_slot
*slot
)
1558 sta
= get_slot_status(slot
);
1560 return (sta
== 0) ? 0 : 1;