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
;
162 if (!acpi_pci_check_ejectable(pbus
, handle
) && !is_dock_device(handle
))
165 status
= acpi_evaluate_integer(handle
, "_ADR", NULL
, &adr
);
166 if (ACPI_FAILURE(status
)) {
167 warn("can't evaluate _ADR (%#x)\n", status
);
171 device
= (adr
>> 16) & 0xffff;
172 function
= adr
& 0xffff;
175 if (pdev
&& device_is_managed_by_native_pciehp(pdev
))
178 newfunc
= kzalloc(sizeof(struct acpiphp_func
), GFP_KERNEL
);
182 INIT_LIST_HEAD(&newfunc
->sibling
);
183 newfunc
->handle
= handle
;
184 newfunc
->function
= function
;
186 if (ACPI_SUCCESS(acpi_get_handle(handle
, "_EJ0", &tmp
)))
187 newfunc
->flags
= FUNC_HAS_EJ0
;
189 if (ACPI_SUCCESS(acpi_get_handle(handle
, "_STA", &tmp
)))
190 newfunc
->flags
|= FUNC_HAS_STA
;
192 if (ACPI_SUCCESS(acpi_get_handle(handle
, "_PS0", &tmp
)))
193 newfunc
->flags
|= FUNC_HAS_PS0
;
195 if (ACPI_SUCCESS(acpi_get_handle(handle
, "_PS3", &tmp
)))
196 newfunc
->flags
|= FUNC_HAS_PS3
;
198 if (ACPI_SUCCESS(acpi_get_handle(handle
, "_DCK", &tmp
)))
199 newfunc
->flags
|= FUNC_HAS_DCK
;
201 status
= acpi_evaluate_integer(handle
, "_SUN", NULL
, &sun
);
202 if (ACPI_FAILURE(status
)) {
204 * use the count of the number of slots we've found
205 * for the number of the slot
207 sun
= bridge
->nr_slots
+1;
210 /* search for objects that share the same slot */
211 for (slot
= bridge
->slots
; slot
; slot
= slot
->next
)
212 if (slot
->device
== device
) {
213 if (slot
->sun
!= sun
)
214 warn("sibling found, but _SUN doesn't match!\n");
219 slot
= kzalloc(sizeof(struct acpiphp_slot
), GFP_KERNEL
);
225 slot
->bridge
= bridge
;
226 slot
->device
= device
;
228 INIT_LIST_HEAD(&slot
->funcs
);
229 mutex_init(&slot
->crit_sect
);
231 slot
->next
= bridge
->slots
;
232 bridge
->slots
= slot
;
236 dbg("found ACPI PCI Hotplug slot %llu at PCI %04x:%02x:%02x\n",
237 slot
->sun
, pci_domain_nr(pbus
), pbus
->number
, device
);
238 retval
= acpiphp_register_hotplug_slot(slot
);
240 if (retval
== -EBUSY
)
241 warn("Slot %llu already registered by another "
242 "hotplug driver\n", slot
->sun
);
244 warn("acpiphp_register_hotplug_slot failed "
245 "(err code = 0x%x)\n", retval
);
250 newfunc
->slot
= slot
;
251 list_add_tail(&newfunc
->sibling
, &slot
->funcs
);
253 if (pci_bus_read_dev_vendor_id(pbus
, PCI_DEVFN(device
, function
),
255 slot
->flags
|= (SLOT_ENABLED
| SLOT_POWEREDON
);
257 if (is_dock_device(handle
)) {
258 /* we don't want to call this device's _EJ0
259 * because we want the dock notify handler
260 * to call it after it calls _DCK
262 newfunc
->flags
&= ~FUNC_HAS_EJ0
;
263 if (register_hotplug_dock_device(handle
,
264 &acpiphp_dock_ops
, newfunc
))
265 dbg("failed to register dock device\n");
267 /* we need to be notified when dock events happen
268 * outside of the hotplug operation, since we may
269 * need to do fixups before we can hotplug.
271 newfunc
->nb
.notifier_call
= post_dock_fixups
;
272 if (register_dock_notifier(&newfunc
->nb
))
273 dbg("failed to register a dock notifier");
276 /* install notify handler */
277 if (!(newfunc
->flags
& FUNC_HAS_DCK
)) {
278 status
= acpi_install_notify_handler(handle
,
280 handle_hotplug_event_func
,
283 if (ACPI_FAILURE(status
))
284 err("failed to register interrupt notify handler\n");
292 bridge
->slots
= slot
->next
;
300 /* see if it's worth looking at this bridge */
301 static int detect_ejectable_slots(acpi_handle handle
)
303 int found
= acpi_pci_detect_ejectable(handle
);
305 acpi_walk_namespace(ACPI_TYPE_DEVICE
, handle
, (u32
)1,
306 is_pci_dock_device
, NULL
, (void *)&found
, NULL
);
311 /* initialize miscellaneous stuff for both root and PCI-to-PCI bridge */
312 static void init_bridge_misc(struct acpiphp_bridge
*bridge
)
316 /* must be added to the list prior to calling register_slot */
317 list_add(&bridge
->list
, &bridge_list
);
319 /* register all slot objects under this bridge */
320 status
= acpi_walk_namespace(ACPI_TYPE_DEVICE
, bridge
->handle
, (u32
)1,
321 register_slot
, NULL
, bridge
, NULL
);
322 if (ACPI_FAILURE(status
)) {
323 list_del(&bridge
->list
);
327 /* install notify handler for P2P bridges */
328 if (!pci_is_root_bus(bridge
->pci_bus
)) {
329 if ((bridge
->flags
& BRIDGE_HAS_EJ0
) && bridge
->func
) {
330 status
= acpi_remove_notify_handler(bridge
->func
->handle
,
332 handle_hotplug_event_func
);
333 if (ACPI_FAILURE(status
))
334 err("failed to remove notify handler\n");
336 status
= acpi_install_notify_handler(bridge
->handle
,
338 handle_hotplug_event_bridge
,
341 if (ACPI_FAILURE(status
)) {
342 err("failed to register interrupt notify handler\n");
348 /* find acpiphp_func from acpiphp_bridge */
349 static struct acpiphp_func
*acpiphp_bridge_handle_to_function(acpi_handle handle
)
351 struct acpiphp_bridge
*bridge
;
352 struct acpiphp_slot
*slot
;
353 struct acpiphp_func
*func
;
355 list_for_each_entry(bridge
, &bridge_list
, list
) {
356 for (slot
= bridge
->slots
; slot
; slot
= slot
->next
) {
357 list_for_each_entry(func
, &slot
->funcs
, sibling
) {
358 if (func
->handle
== handle
)
368 static struct acpiphp_bridge
*acpiphp_handle_to_bridge(acpi_handle handle
)
370 struct acpiphp_bridge
*bridge
;
372 list_for_each_entry(bridge
, &bridge_list
, list
)
373 if (bridge
->handle
== handle
)
379 static void cleanup_bridge(struct acpiphp_bridge
*bridge
)
381 struct acpiphp_slot
*slot
, *next
;
382 struct acpiphp_func
*func
, *tmp
;
384 acpi_handle handle
= bridge
->handle
;
386 if (!pci_is_root_bus(bridge
->pci_bus
)) {
387 status
= acpi_remove_notify_handler(handle
,
389 handle_hotplug_event_bridge
);
390 if (ACPI_FAILURE(status
))
391 err("failed to remove notify handler\n");
394 if ((bridge
->flags
& BRIDGE_HAS_EJ0
) && bridge
->func
) {
395 status
= acpi_install_notify_handler(bridge
->func
->handle
,
397 handle_hotplug_event_func
,
399 if (ACPI_FAILURE(status
))
400 err("failed to install interrupt notify handler\n");
403 slot
= bridge
->slots
;
406 list_for_each_entry_safe(func
, tmp
, &slot
->funcs
, sibling
) {
407 if (is_dock_device(func
->handle
)) {
408 unregister_hotplug_dock_device(func
->handle
);
409 unregister_dock_notifier(&func
->nb
);
411 if (!(func
->flags
& FUNC_HAS_DCK
)) {
412 status
= acpi_remove_notify_handler(func
->handle
,
414 handle_hotplug_event_func
);
415 if (ACPI_FAILURE(status
))
416 err("failed to remove notify handler\n");
418 list_del(&func
->sibling
);
421 acpiphp_unregister_hotplug_slot(slot
);
422 list_del(&slot
->funcs
);
427 put_device(&bridge
->pci_bus
->dev
);
428 pci_dev_put(bridge
->pci_dev
);
429 list_del(&bridge
->list
);
433 static int power_on_slot(struct acpiphp_slot
*slot
)
436 struct acpiphp_func
*func
;
439 /* if already enabled, just skip */
440 if (slot
->flags
& SLOT_POWEREDON
)
443 list_for_each_entry(func
, &slot
->funcs
, sibling
) {
444 if (func
->flags
& FUNC_HAS_PS0
) {
445 dbg("%s: executing _PS0\n", __func__
);
446 status
= acpi_evaluate_object(func
->handle
, "_PS0", NULL
, NULL
);
447 if (ACPI_FAILURE(status
)) {
448 warn("%s: _PS0 failed\n", __func__
);
456 /* TBD: evaluate _STA to check if the slot is enabled */
458 slot
->flags
|= SLOT_POWEREDON
;
465 static int power_off_slot(struct acpiphp_slot
*slot
)
468 struct acpiphp_func
*func
;
472 /* if already disabled, just skip */
473 if ((slot
->flags
& SLOT_POWEREDON
) == 0)
476 list_for_each_entry(func
, &slot
->funcs
, sibling
) {
477 if (func
->flags
& FUNC_HAS_PS3
) {
478 status
= acpi_evaluate_object(func
->handle
, "_PS3", NULL
, NULL
);
479 if (ACPI_FAILURE(status
)) {
480 warn("%s: _PS3 failed\n", __func__
);
488 /* TBD: evaluate _STA to check if the slot is disabled */
490 slot
->flags
&= (~SLOT_POWEREDON
);
499 * acpiphp_max_busnr - return the highest reserved bus number under the given bus.
500 * @bus: bus to start search with
502 static unsigned char acpiphp_max_busnr(struct pci_bus
*bus
)
504 struct list_head
*tmp
;
505 unsigned char max
, n
;
508 * pci_bus_max_busnr will return the highest
509 * reserved busnr for all these children.
510 * that is equivalent to the bus->subordinate
511 * value. We don't want to use the parent's
512 * bus->subordinate value because it could have
515 max
= bus
->busn_res
.start
;
517 list_for_each(tmp
, &bus
->children
) {
518 n
= pci_bus_max_busnr(pci_bus_b(tmp
));
527 * acpiphp_bus_add - add a new bus to acpi subsystem
528 * @func: acpiphp_func of the bridge
530 static int acpiphp_bus_add(struct acpiphp_func
*func
)
532 struct acpi_device
*device
;
535 if (!acpi_bus_get_device(func
->handle
, &device
)) {
536 dbg("bus exists... trim\n");
537 /* this shouldn't be in here, so remove
538 * the bus then re-add it...
540 acpi_bus_trim(device
);
543 ret_val
= acpi_bus_scan(func
->handle
);
545 ret_val
= acpi_bus_get_device(func
->handle
, &device
);
548 dbg("error adding bus, %x\n", -ret_val
);
555 * acpiphp_bus_trim - trim a bus from acpi subsystem
556 * @handle: handle to acpi namespace
558 static int acpiphp_bus_trim(acpi_handle handle
)
560 struct acpi_device
*device
;
563 retval
= acpi_bus_get_device(handle
, &device
);
565 dbg("acpi_device not found\n");
569 acpi_bus_trim(device
);
573 static void acpiphp_set_acpi_region(struct acpiphp_slot
*slot
)
575 struct acpiphp_func
*func
;
576 union acpi_object params
[2];
577 struct acpi_object_list arg_list
;
579 list_for_each_entry(func
, &slot
->funcs
, sibling
) {
581 arg_list
.pointer
= params
;
582 params
[0].type
= ACPI_TYPE_INTEGER
;
583 params
[0].integer
.value
= ACPI_ADR_SPACE_PCI_CONFIG
;
584 params
[1].type
= ACPI_TYPE_INTEGER
;
585 params
[1].integer
.value
= 1;
586 /* _REG is optional, we don't care about if there is failure */
587 acpi_evaluate_object(func
->handle
, "_REG", &arg_list
, NULL
);
591 static void check_hotplug_bridge(struct acpiphp_slot
*slot
, struct pci_dev
*dev
)
593 struct acpiphp_func
*func
;
595 if (!dev
->subordinate
)
598 /* quirk, or pcie could set it already */
599 if (dev
->is_hotplug_bridge
)
602 if (PCI_SLOT(dev
->devfn
) != slot
->device
)
605 list_for_each_entry(func
, &slot
->funcs
, sibling
) {
606 if (PCI_FUNC(dev
->devfn
) == func
->function
) {
607 /* check if this bridge has ejectable slots */
608 if ((detect_ejectable_slots(func
->handle
) > 0))
609 dev
->is_hotplug_bridge
= 1;
616 * enable_device - enable, configure a slot
617 * @slot: slot to be enabled
619 * This function should be called per *physical slot*,
620 * not per each slot object in ACPI namespace.
622 static int __ref
enable_device(struct acpiphp_slot
*slot
)
625 struct pci_bus
*bus
= slot
->bridge
->pci_bus
;
626 struct acpiphp_func
*func
;
630 if (slot
->flags
& SLOT_ENABLED
)
633 list_for_each_entry(func
, &slot
->funcs
, sibling
)
634 acpiphp_bus_add(func
);
636 num
= pci_scan_slot(bus
, PCI_DEVFN(slot
->device
, 0));
638 /* Maybe only part of funcs are added. */
639 dbg("No new device found\n");
643 max
= acpiphp_max_busnr(bus
);
644 for (pass
= 0; pass
< 2; pass
++) {
645 list_for_each_entry(dev
, &bus
->devices
, bus_list
) {
646 if (PCI_SLOT(dev
->devfn
) != slot
->device
)
648 if (dev
->hdr_type
== PCI_HEADER_TYPE_BRIDGE
||
649 dev
->hdr_type
== PCI_HEADER_TYPE_CARDBUS
) {
650 max
= pci_scan_bridge(bus
, dev
, max
, pass
);
651 if (pass
&& dev
->subordinate
) {
652 check_hotplug_bridge(slot
, dev
);
653 pci_bus_size_bridges(dev
->subordinate
);
659 pci_bus_assign_resources(bus
);
660 acpiphp_sanitize_bus(bus
);
661 acpiphp_set_hpp_values(bus
);
662 acpiphp_set_acpi_region(slot
);
663 pci_enable_bridges(bus
);
665 list_for_each_entry(dev
, &bus
->devices
, bus_list
) {
666 /* Assume that newly added devices are powered on already. */
668 dev
->current_state
= PCI_D0
;
671 pci_bus_add_devices(bus
);
673 slot
->flags
|= SLOT_ENABLED
;
674 list_for_each_entry(func
, &slot
->funcs
, sibling
) {
675 dev
= pci_get_slot(bus
, PCI_DEVFN(slot
->device
,
678 /* Do not set SLOT_ENABLED flag if some funcs
680 slot
->flags
&= (~SLOT_ENABLED
);
690 /* return first device in slot, acquiring a reference on it */
691 static struct pci_dev
*dev_in_slot(struct acpiphp_slot
*slot
)
693 struct pci_bus
*bus
= slot
->bridge
->pci_bus
;
695 struct pci_dev
*ret
= NULL
;
697 down_read(&pci_bus_sem
);
698 list_for_each_entry(dev
, &bus
->devices
, bus_list
)
699 if (PCI_SLOT(dev
->devfn
) == slot
->device
) {
700 ret
= pci_dev_get(dev
);
703 up_read(&pci_bus_sem
);
709 * disable_device - disable a slot
710 * @slot: ACPI PHP slot
712 static int disable_device(struct acpiphp_slot
*slot
)
714 struct acpiphp_func
*func
;
715 struct pci_dev
*pdev
;
718 * enable_device() enumerates all functions in this device via
719 * pci_scan_slot(), whether they have associated ACPI hotplug
720 * methods (_EJ0, etc.) or not. Therefore, we remove all functions
723 while ((pdev
= dev_in_slot(slot
))) {
724 pci_stop_and_remove_bus_device(pdev
);
728 list_for_each_entry(func
, &slot
->funcs
, sibling
) {
729 acpiphp_bus_trim(func
->handle
);
732 slot
->flags
&= (~SLOT_ENABLED
);
739 * get_slot_status - get ACPI slot status
740 * @slot: ACPI PHP slot
742 * If a slot has _STA for each function and if any one of them
743 * returned non-zero status, return it.
745 * If a slot doesn't have _STA and if any one of its functions'
746 * configuration space is configured, return 0x0f as a _STA.
748 * Otherwise return 0.
750 static unsigned int get_slot_status(struct acpiphp_slot
*slot
)
753 unsigned long long sta
= 0;
755 struct acpiphp_func
*func
;
757 list_for_each_entry(func
, &slot
->funcs
, sibling
) {
758 if (func
->flags
& FUNC_HAS_STA
) {
759 status
= acpi_evaluate_integer(func
->handle
, "_STA", NULL
, &sta
);
760 if (ACPI_SUCCESS(status
) && sta
)
763 pci_bus_read_config_dword(slot
->bridge
->pci_bus
,
764 PCI_DEVFN(slot
->device
,
766 PCI_VENDOR_ID
, &dvid
);
767 if (dvid
!= 0xffffffff) {
774 return (unsigned int)sta
;
778 * acpiphp_eject_slot - physically eject the slot
779 * @slot: ACPI PHP slot
781 int acpiphp_eject_slot(struct acpiphp_slot
*slot
)
784 struct acpiphp_func
*func
;
785 struct acpi_object_list arg_list
;
786 union acpi_object arg
;
788 list_for_each_entry(func
, &slot
->funcs
, sibling
) {
789 /* We don't want to call _EJ0 on non-existing functions. */
790 if ((func
->flags
& FUNC_HAS_EJ0
)) {
791 /* _EJ0 method take one argument */
793 arg_list
.pointer
= &arg
;
794 arg
.type
= ACPI_TYPE_INTEGER
;
795 arg
.integer
.value
= 1;
797 status
= acpi_evaluate_object(func
->handle
, "_EJ0", &arg_list
, NULL
);
798 if (ACPI_FAILURE(status
)) {
799 warn("%s: _EJ0 failed\n", __func__
);
809 * acpiphp_check_bridge - re-enumerate devices
810 * @bridge: where to begin re-enumeration
812 * Iterate over all slots under this bridge and make sure that if a
813 * card is present they are enabled, and if not they are disabled.
815 static int acpiphp_check_bridge(struct acpiphp_bridge
*bridge
)
817 struct acpiphp_slot
*slot
;
819 int enabled
, disabled
;
821 enabled
= disabled
= 0;
823 for (slot
= bridge
->slots
; slot
; slot
= slot
->next
) {
824 unsigned int status
= get_slot_status(slot
);
825 if (slot
->flags
& SLOT_ENABLED
) {
826 if (status
== ACPI_STA_ALL
)
828 retval
= acpiphp_disable_slot(slot
);
830 err("Error occurred in disabling\n");
833 acpiphp_eject_slot(slot
);
837 if (status
!= ACPI_STA_ALL
)
839 retval
= acpiphp_enable_slot(slot
);
841 err("Error occurred in enabling\n");
848 dbg("%s: %d enabled, %d disabled\n", __func__
, enabled
, disabled
);
854 static void acpiphp_set_hpp_values(struct pci_bus
*bus
)
858 list_for_each_entry(dev
, &bus
->devices
, bus_list
)
859 pci_configure_slot(dev
);
863 * Remove devices for which we could not assign resources, call
864 * arch specific code to fix-up the bus
866 static void acpiphp_sanitize_bus(struct pci_bus
*bus
)
868 struct pci_dev
*dev
, *tmp
;
870 unsigned long type_mask
= IORESOURCE_IO
| IORESOURCE_MEM
;
872 list_for_each_entry_safe(dev
, tmp
, &bus
->devices
, bus_list
) {
873 for (i
=0; i
<PCI_BRIDGE_RESOURCES
; i
++) {
874 struct resource
*res
= &dev
->resource
[i
];
875 if ((res
->flags
& type_mask
) && !res
->start
&&
877 /* Could not assign a required resources
878 * for this device, remove it */
879 pci_stop_and_remove_bus_device(dev
);
887 * ACPI event handlers
891 check_sub_bridges(acpi_handle handle
, u32 lvl
, void *context
, void **rv
)
893 struct acpiphp_bridge
*bridge
;
895 struct acpi_buffer buffer
= { .length
= sizeof(objname
),
896 .pointer
= objname
};
898 bridge
= acpiphp_handle_to_bridge(handle
);
900 acpi_get_name(handle
, ACPI_FULL_PATHNAME
, &buffer
);
901 dbg("%s: re-enumerating slots under %s\n",
903 acpiphp_check_bridge(bridge
);
908 static void _handle_hotplug_event_bridge(struct work_struct
*work
)
910 struct acpiphp_bridge
*bridge
;
912 struct acpi_buffer buffer
= { .length
= sizeof(objname
),
913 .pointer
= objname
};
914 struct acpi_hp_work
*hp_work
;
918 hp_work
= container_of(work
, struct acpi_hp_work
, work
);
919 handle
= hp_work
->handle
;
920 type
= hp_work
->type
;
921 bridge
= (struct acpiphp_bridge
*)hp_work
->context
;
923 acpi_scan_lock_acquire();
925 acpi_get_name(handle
, ACPI_FULL_PATHNAME
, &buffer
);
928 case ACPI_NOTIFY_BUS_CHECK
:
929 /* bus re-enumerate */
930 dbg("%s: Bus check notify on %s\n", __func__
, objname
);
931 dbg("%s: re-enumerating slots under %s\n", __func__
, objname
);
932 acpiphp_check_bridge(bridge
);
933 acpi_walk_namespace(ACPI_TYPE_DEVICE
, handle
,
934 ACPI_UINT32_MAX
, check_sub_bridges
, NULL
, NULL
, NULL
);
937 case ACPI_NOTIFY_DEVICE_CHECK
:
939 dbg("%s: Device check notify on %s\n", __func__
, objname
);
940 acpiphp_check_bridge(bridge
);
943 case ACPI_NOTIFY_DEVICE_WAKE
:
945 dbg("%s: Device wake notify on %s\n", __func__
, objname
);
948 case ACPI_NOTIFY_EJECT_REQUEST
:
949 /* request device eject */
950 dbg("%s: Device eject notify on %s\n", __func__
, objname
);
951 if ((bridge
->flags
& BRIDGE_HAS_EJ0
) && bridge
->func
) {
952 struct acpiphp_slot
*slot
;
953 slot
= bridge
->func
->slot
;
954 if (!acpiphp_disable_slot(slot
))
955 acpiphp_eject_slot(slot
);
959 case ACPI_NOTIFY_FREQUENCY_MISMATCH
:
960 printk(KERN_ERR
"Device %s cannot be configured due"
961 " to a frequency mismatch\n", objname
);
964 case ACPI_NOTIFY_BUS_MODE_MISMATCH
:
965 printk(KERN_ERR
"Device %s cannot be configured due"
966 " to a bus mode mismatch\n", objname
);
969 case ACPI_NOTIFY_POWER_FAULT
:
970 printk(KERN_ERR
"Device %s has suffered a power fault\n",
975 warn("notify_handler: unknown event type 0x%x for %s\n", type
, objname
);
979 acpi_scan_lock_release();
980 kfree(hp_work
); /* allocated in handle_hotplug_event_bridge */
984 * handle_hotplug_event_bridge - handle ACPI event on bridges
985 * @handle: Notify()'ed acpi_handle
987 * @context: pointer to acpiphp_bridge structure
989 * Handles ACPI event notification on {host,p2p} bridges.
991 static void handle_hotplug_event_bridge(acpi_handle handle
, u32 type
,
995 * Currently the code adds all hotplug events to the kacpid_wq
996 * queue when it should add hotplug events to the kacpi_hotplug_wq.
997 * The proper way to fix this is to reorganize the code so that
998 * drivers (dock, etc.) do not call acpi_os_execute(), etc.
999 * For now just re-add this work to the kacpi_hotplug_wq so we
1000 * don't deadlock on hotplug actions.
1002 alloc_acpi_hp_work(handle
, type
, context
, _handle_hotplug_event_bridge
);
1005 static void _handle_hotplug_event_func(struct work_struct
*work
)
1007 struct acpiphp_func
*func
;
1009 struct acpi_buffer buffer
= { .length
= sizeof(objname
),
1010 .pointer
= objname
};
1011 struct acpi_hp_work
*hp_work
;
1015 hp_work
= container_of(work
, struct acpi_hp_work
, work
);
1016 handle
= hp_work
->handle
;
1017 type
= hp_work
->type
;
1018 func
= (struct acpiphp_func
*)hp_work
->context
;
1020 acpi_scan_lock_acquire();
1022 acpi_get_name(handle
, ACPI_FULL_PATHNAME
, &buffer
);
1025 case ACPI_NOTIFY_BUS_CHECK
:
1026 /* bus re-enumerate */
1027 dbg("%s: Bus check notify on %s\n", __func__
, objname
);
1028 acpiphp_enable_slot(func
->slot
);
1031 case ACPI_NOTIFY_DEVICE_CHECK
:
1032 /* device check : re-enumerate from parent bus */
1033 dbg("%s: Device check notify on %s\n", __func__
, objname
);
1034 acpiphp_check_bridge(func
->slot
->bridge
);
1037 case ACPI_NOTIFY_DEVICE_WAKE
:
1039 dbg("%s: Device wake notify on %s\n", __func__
, objname
);
1042 case ACPI_NOTIFY_EJECT_REQUEST
:
1043 /* request device eject */
1044 dbg("%s: Device eject notify on %s\n", __func__
, objname
);
1045 if (!(acpiphp_disable_slot(func
->slot
)))
1046 acpiphp_eject_slot(func
->slot
);
1050 warn("notify_handler: unknown event type 0x%x for %s\n", type
, objname
);
1054 acpi_scan_lock_release();
1055 kfree(hp_work
); /* allocated in handle_hotplug_event_func */
1059 * handle_hotplug_event_func - handle ACPI event on functions (i.e. slots)
1060 * @handle: Notify()'ed acpi_handle
1061 * @type: Notify code
1062 * @context: pointer to acpiphp_func structure
1064 * Handles ACPI event notification on slots.
1066 static void handle_hotplug_event_func(acpi_handle handle
, u32 type
,
1070 * Currently the code adds all hotplug events to the kacpid_wq
1071 * queue when it should add hotplug events to the kacpi_hotplug_wq.
1072 * The proper way to fix this is to reorganize the code so that
1073 * drivers (dock, etc.) do not call acpi_os_execute(), etc.
1074 * For now just re-add this work to the kacpi_hotplug_wq so we
1075 * don't deadlock on hotplug actions.
1077 alloc_acpi_hp_work(handle
, type
, context
, _handle_hotplug_event_func
);
1081 * Create hotplug slots for the PCI bus.
1082 * It should always return 0 to avoid skipping following notifiers.
1084 void acpiphp_enumerate_slots(struct pci_bus
*bus
, acpi_handle handle
)
1086 acpi_handle dummy_handle
;
1087 struct acpiphp_bridge
*bridge
;
1089 if (acpiphp_disabled
)
1092 if (detect_ejectable_slots(handle
) <= 0)
1095 bridge
= kzalloc(sizeof(struct acpiphp_bridge
), GFP_KERNEL
);
1096 if (bridge
== NULL
) {
1097 err("out of memory\n");
1101 bridge
->handle
= handle
;
1102 bridge
->pci_dev
= pci_dev_get(bus
->self
);
1103 bridge
->pci_bus
= bus
;
1106 * Grab a ref to the subordinate PCI bus in case the bus is
1107 * removed via PCI core logical hotplug. The ref pins the bus
1108 * (which we access during module unload).
1110 get_device(&bus
->dev
);
1112 if (!pci_is_root_bus(bridge
->pci_bus
) &&
1113 ACPI_SUCCESS(acpi_get_handle(bridge
->handle
,
1114 "_EJ0", &dummy_handle
))) {
1115 dbg("found ejectable p2p bridge\n");
1116 bridge
->flags
|= BRIDGE_HAS_EJ0
;
1117 bridge
->func
= acpiphp_bridge_handle_to_function(handle
);
1120 init_bridge_misc(bridge
);
1123 /* Destroy hotplug slots associated with the PCI bus */
1124 void acpiphp_remove_slots(struct pci_bus
*bus
)
1126 struct acpiphp_bridge
*bridge
, *tmp
;
1128 if (acpiphp_disabled
)
1131 list_for_each_entry_safe(bridge
, tmp
, &bridge_list
, list
)
1132 if (bridge
->pci_bus
== bus
) {
1133 cleanup_bridge(bridge
);
1139 * acpiphp_enable_slot - power on slot
1140 * @slot: ACPI PHP slot
1142 int acpiphp_enable_slot(struct acpiphp_slot
*slot
)
1146 mutex_lock(&slot
->crit_sect
);
1148 /* wake up all functions */
1149 retval
= power_on_slot(slot
);
1153 if (get_slot_status(slot
) == ACPI_STA_ALL
) {
1154 /* configure all functions */
1155 retval
= enable_device(slot
);
1157 power_off_slot(slot
);
1159 dbg("%s: Slot status is not ACPI_STA_ALL\n", __func__
);
1160 power_off_slot(slot
);
1164 mutex_unlock(&slot
->crit_sect
);
1169 * acpiphp_disable_slot - power off slot
1170 * @slot: ACPI PHP slot
1172 int acpiphp_disable_slot(struct acpiphp_slot
*slot
)
1176 mutex_lock(&slot
->crit_sect
);
1178 /* unconfigure all functions */
1179 retval
= disable_device(slot
);
1183 /* power off all functions */
1184 retval
= power_off_slot(slot
);
1189 mutex_unlock(&slot
->crit_sect
);
1198 u8
acpiphp_get_power_status(struct acpiphp_slot
*slot
)
1200 return (slot
->flags
& SLOT_POWEREDON
);
1208 u8
acpiphp_get_latch_status(struct acpiphp_slot
*slot
)
1212 sta
= get_slot_status(slot
);
1214 return (sta
& ACPI_STA_DEVICE_UI
) ? 0 : 1;
1219 * adapter presence : 1
1222 u8
acpiphp_get_adapter_status(struct acpiphp_slot
*slot
)
1226 sta
= get_slot_status(slot
);
1228 return (sta
== 0) ? 0 : 1;