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 #define pr_fmt(fmt) "acpiphp_glue: " fmt
44 #include <linux/module.h>
46 #include <linux/kernel.h>
47 #include <linux/pci.h>
48 #include <linux/pci_hotplug.h>
49 #include <linux/pci-acpi.h>
50 #include <linux/pm_runtime.h>
51 #include <linux/mutex.h>
52 #include <linux/slab.h>
53 #include <linux/acpi.h>
58 static LIST_HEAD(bridge_list);
59 static DEFINE_MUTEX(bridge_mutex);
61 static int acpiphp_hotplug_notify(struct acpi_device *adev, u32 type);
62 static void acpiphp_post_dock_fixup(struct acpi_device *adev);
63 static void acpiphp_sanitize_bus(struct pci_bus *bus);
64 static void hotplug_event(u32 type, struct acpiphp_context *context);
65 static void free_bridge(struct kref *kref);
68 * acpiphp_init_context - Create hotplug context and grab a reference to it.
69 * @adev: ACPI device object to create the context for.
71 * Call under acpi_hp_context_lock.
73 static struct acpiphp_context *acpiphp_init_context(struct acpi_device *adev)
75 struct acpiphp_context *context;
77 context = kzalloc(sizeof(*context), GFP_KERNEL);
81 context->refcount = 1;
82 context->hp.notify = acpiphp_hotplug_notify;
83 context->hp.fixup = acpiphp_post_dock_fixup;
84 acpi_set_hp_context(adev, &context->hp);
89 * acpiphp_get_context - Get hotplug context and grab a reference to it.
90 * @adev: ACPI device object to get the context for.
92 * Call under acpi_hp_context_lock.
94 static struct acpiphp_context *acpiphp_get_context(struct acpi_device *adev)
96 struct acpiphp_context *context;
101 context = to_acpiphp_context(adev->hp);
107 * acpiphp_put_context - Drop a reference to ACPI hotplug context.
108 * @context: ACPI hotplug context to drop a reference to.
110 * The context object is removed if there are no more references to it.
112 * Call under acpi_hp_context_lock.
114 static void acpiphp_put_context(struct acpiphp_context *context)
116 if (--context->refcount)
119 WARN_ON(context->bridge);
120 context->hp.self->hp = NULL;
124 static inline void get_bridge(struct acpiphp_bridge *bridge)
126 kref_get(&bridge->ref);
129 static inline void put_bridge(struct acpiphp_bridge *bridge)
131 kref_put(&bridge->ref, free_bridge);
134 static struct acpiphp_context *acpiphp_grab_context(struct acpi_device *adev)
136 struct acpiphp_context *context;
138 acpi_lock_hp_context();
140 context = acpiphp_get_context(adev);
144 if (context->func.parent->is_going_away) {
145 acpiphp_put_context(context);
150 get_bridge(context->func.parent);
151 acpiphp_put_context(context);
154 acpi_unlock_hp_context();
158 static void acpiphp_let_context_go(struct acpiphp_context *context)
160 put_bridge(context->func.parent);
163 static void free_bridge(struct kref *kref)
165 struct acpiphp_context *context;
166 struct acpiphp_bridge *bridge;
167 struct acpiphp_slot *slot, *next;
168 struct acpiphp_func *func, *tmp;
170 acpi_lock_hp_context();
172 bridge = container_of(kref, struct acpiphp_bridge, ref);
174 list_for_each_entry_safe(slot, next, &bridge->slots, node) {
175 list_for_each_entry_safe(func, tmp, &slot->funcs, sibling)
176 acpiphp_put_context(func_to_context(func));
181 context = bridge->context;
182 /* Root bridges will not have hotplug context. */
184 /* Release the reference taken by acpiphp_enumerate_slots(). */
185 put_bridge(context->func.parent);
186 context->bridge = NULL;
187 acpiphp_put_context(context);
190 put_device(&bridge->pci_bus->dev);
191 pci_dev_put(bridge->pci_dev);
194 acpi_unlock_hp_context();
198 * acpiphp_post_dock_fixup - Post-dock fixups for PCI devices.
199 * @adev: ACPI device object corresponding to a PCI device.
201 * TBD - figure out a way to only call fixups for systems that require them.
203 static void acpiphp_post_dock_fixup(struct acpi_device *adev)
205 struct acpiphp_context *context = acpiphp_grab_context(adev);
212 bus = context->func.slot->bus;
216 /* fixup bad _DCK function that rewrites
217 * secondary bridge on slot
219 pci_read_config_dword(bus->self, PCI_PRIMARY_BUS, &buses);
221 if (((buses >> 8) & 0xff) != bus->busn_res.start) {
222 buses = (buses & 0xff000000)
223 | ((unsigned int)(bus->primary) << 0)
224 | ((unsigned int)(bus->busn_res.start) << 8)
225 | ((unsigned int)(bus->busn_res.end) << 16);
226 pci_write_config_dword(bus->self, PCI_PRIMARY_BUS, buses);
230 acpiphp_let_context_go(context);
234 * acpiphp_add_context - Add ACPIPHP context to an ACPI device object.
235 * @handle: ACPI handle of the object to add a context to.
237 * @data: The object's parent ACPIPHP bridge.
240 static acpi_status acpiphp_add_context(acpi_handle handle, u32 lvl, void *data,
243 struct acpiphp_bridge *bridge = data;
244 struct acpiphp_context *context;
245 struct acpi_device *adev;
246 struct acpiphp_slot *slot;
247 struct acpiphp_func *newfunc;
248 acpi_status status = AE_OK;
249 unsigned long long adr;
250 int device, function;
251 struct pci_bus *pbus = bridge->pci_bus;
252 struct pci_dev *pdev = bridge->pci_dev;
255 status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr);
256 if (ACPI_FAILURE(status)) {
257 if (status != AE_NOT_FOUND)
258 acpi_handle_warn(handle,
259 "can't evaluate _ADR (%#x)\n", status);
262 if (acpi_bus_get_device(handle, &adev))
265 device = (adr >> 16) & 0xffff;
266 function = adr & 0xffff;
268 acpi_lock_hp_context();
269 context = acpiphp_init_context(adev);
271 acpi_unlock_hp_context();
272 acpi_handle_err(handle, "No hotplug context\n");
275 newfunc = &context->func;
276 newfunc->function = function;
277 newfunc->parent = bridge;
278 acpi_unlock_hp_context();
281 * If this is a dock device, its _EJ0 should be executed by the dock
282 * notify handler after calling _DCK.
284 if (!is_dock_device(adev) && acpi_has_method(handle, "_EJ0"))
285 newfunc->flags = FUNC_HAS_EJ0;
287 if (acpi_has_method(handle, "_STA"))
288 newfunc->flags |= FUNC_HAS_STA;
290 /* search for objects that share the same slot */
291 list_for_each_entry(slot, &bridge->slots, node)
292 if (slot->device == device)
295 slot = kzalloc(sizeof(struct acpiphp_slot), GFP_KERNEL);
297 acpi_lock_hp_context();
298 acpiphp_put_context(context);
299 acpi_unlock_hp_context();
303 slot->bus = bridge->pci_bus;
304 slot->device = device;
305 INIT_LIST_HEAD(&slot->funcs);
307 list_add_tail(&slot->node, &bridge->slots);
310 * Expose slots to user space for functions that have _EJ0 or _RMV or
311 * are located in dock stations. Do not expose them for devices handled
312 * by the native PCIe hotplug (PCIeHP), becuase that code is supposed to
313 * expose slots to user space in those cases.
315 if ((acpi_pci_check_ejectable(pbus, handle) || is_dock_device(adev))
316 && !(pdev && pdev->is_hotplug_bridge && pciehp_is_native(pdev))) {
317 unsigned long long sun;
321 status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun);
322 if (ACPI_FAILURE(status))
323 sun = bridge->nr_slots;
325 pr_debug("found ACPI PCI Hotplug slot %llu at PCI %04x:%02x:%02x\n",
326 sun, pci_domain_nr(pbus), pbus->number, device);
328 retval = acpiphp_register_hotplug_slot(slot, sun);
332 if (retval == -EBUSY)
333 pr_warn("Slot %llu already registered by another hotplug driver\n", sun);
335 pr_warn("acpiphp_register_hotplug_slot failed (err code = 0x%x)\n", retval);
337 /* Even if the slot registration fails, we can still use it. */
341 newfunc->slot = slot;
342 list_add_tail(&newfunc->sibling, &slot->funcs);
344 if (pci_bus_read_dev_vendor_id(pbus, PCI_DEVFN(device, function),
346 slot->flags |= SLOT_ENABLED;
351 static void cleanup_bridge(struct acpiphp_bridge *bridge)
353 struct acpiphp_slot *slot;
354 struct acpiphp_func *func;
356 list_for_each_entry(slot, &bridge->slots, node) {
357 list_for_each_entry(func, &slot->funcs, sibling) {
358 struct acpi_device *adev = func_to_acpi_device(func);
360 acpi_lock_hp_context();
361 adev->hp->notify = NULL;
362 adev->hp->fixup = NULL;
363 acpi_unlock_hp_context();
365 slot->flags |= SLOT_IS_GOING_AWAY;
367 acpiphp_unregister_hotplug_slot(slot);
370 mutex_lock(&bridge_mutex);
371 list_del(&bridge->list);
372 mutex_unlock(&bridge_mutex);
374 acpi_lock_hp_context();
375 bridge->is_going_away = true;
376 acpi_unlock_hp_context();
380 * acpiphp_max_busnr - return the highest reserved bus number under the given bus.
381 * @bus: bus to start search with
383 static unsigned char acpiphp_max_busnr(struct pci_bus *bus)
386 unsigned char max, n;
389 * pci_bus_max_busnr will return the highest
390 * reserved busnr for all these children.
391 * that is equivalent to the bus->subordinate
392 * value. We don't want to use the parent's
393 * bus->subordinate value because it could have
396 max = bus->busn_res.start;
398 list_for_each_entry(tmp, &bus->children, node) {
399 n = pci_bus_max_busnr(tmp);
406 static void acpiphp_set_acpi_region(struct acpiphp_slot *slot)
408 struct acpiphp_func *func;
409 union acpi_object params[2];
410 struct acpi_object_list arg_list;
412 list_for_each_entry(func, &slot->funcs, sibling) {
414 arg_list.pointer = params;
415 params[0].type = ACPI_TYPE_INTEGER;
416 params[0].integer.value = ACPI_ADR_SPACE_PCI_CONFIG;
417 params[1].type = ACPI_TYPE_INTEGER;
418 params[1].integer.value = 1;
419 /* _REG is optional, we don't care about if there is failure */
420 acpi_evaluate_object(func_to_handle(func), "_REG", &arg_list,
425 static void check_hotplug_bridge(struct acpiphp_slot *slot, struct pci_dev *dev)
427 struct acpiphp_func *func;
429 /* quirk, or pcie could set it already */
430 if (dev->is_hotplug_bridge)
433 list_for_each_entry(func, &slot->funcs, sibling) {
434 if (PCI_FUNC(dev->devfn) == func->function) {
435 dev->is_hotplug_bridge = 1;
441 static int acpiphp_rescan_slot(struct acpiphp_slot *slot)
443 struct acpiphp_func *func;
445 list_for_each_entry(func, &slot->funcs, sibling) {
446 struct acpi_device *adev = func_to_acpi_device(func);
448 acpi_bus_scan(adev->handle);
449 if (acpi_device_enumerated(adev))
450 acpi_device_set_power(adev, ACPI_STATE_D0);
452 return pci_scan_slot(slot->bus, PCI_DEVFN(slot->device, 0));
456 * enable_slot - enable, configure a slot
457 * @slot: slot to be enabled
459 * This function should be called per *physical slot*,
460 * not per each slot object in ACPI namespace.
462 static void enable_slot(struct acpiphp_slot *slot)
465 struct pci_bus *bus = slot->bus;
466 struct acpiphp_func *func;
470 acpiphp_rescan_slot(slot);
471 max = acpiphp_max_busnr(bus);
472 for (pass = 0; pass < 2; pass++) {
473 list_for_each_entry(dev, &bus->devices, bus_list) {
474 if (PCI_SLOT(dev->devfn) != slot->device)
477 if (pci_is_bridge(dev)) {
478 max = pci_scan_bridge(bus, dev, max, pass);
479 if (pass && dev->subordinate) {
480 check_hotplug_bridge(slot, dev);
481 pcibios_resource_survey_bus(dev->subordinate);
482 __pci_bus_size_bridges(dev->subordinate,
488 __pci_bus_assign_resources(bus, &add_list, NULL);
490 acpiphp_sanitize_bus(bus);
491 pcie_bus_configure_settings(bus);
492 acpiphp_set_acpi_region(slot);
494 list_for_each_entry(dev, &bus->devices, bus_list) {
495 /* Assume that newly added devices are powered on already. */
497 dev->current_state = PCI_D0;
500 pci_bus_add_devices(bus);
502 slot->flags |= SLOT_ENABLED;
503 list_for_each_entry(func, &slot->funcs, sibling) {
504 dev = pci_get_slot(bus, PCI_DEVFN(slot->device,
507 /* Do not set SLOT_ENABLED flag if some funcs
509 slot->flags &= (~SLOT_ENABLED);
517 * disable_slot - disable a slot
518 * @slot: ACPI PHP slot
520 static void disable_slot(struct acpiphp_slot *slot)
522 struct pci_bus *bus = slot->bus;
523 struct pci_dev *dev, *prev;
524 struct acpiphp_func *func;
527 * enable_slot() enumerates all functions in this device via
528 * pci_scan_slot(), whether they have associated ACPI hotplug
529 * methods (_EJ0, etc.) or not. Therefore, we remove all functions
532 list_for_each_entry_safe_reverse(dev, prev, &bus->devices, bus_list)
533 if (PCI_SLOT(dev->devfn) == slot->device)
534 pci_stop_and_remove_bus_device(dev);
536 list_for_each_entry(func, &slot->funcs, sibling)
537 acpi_bus_trim(func_to_acpi_device(func));
539 slot->flags &= (~SLOT_ENABLED);
542 static bool slot_no_hotplug(struct acpiphp_slot *slot)
544 struct pci_bus *bus = slot->bus;
547 list_for_each_entry(dev, &bus->devices, bus_list) {
548 if (PCI_SLOT(dev->devfn) == slot->device && dev->ignore_hotplug)
555 * get_slot_status - get ACPI slot status
556 * @slot: ACPI PHP slot
558 * If a slot has _STA for each function and if any one of them
559 * returned non-zero status, return it.
561 * If a slot doesn't have _STA and if any one of its functions'
562 * configuration space is configured, return 0x0f as a _STA.
564 * Otherwise return 0.
566 static unsigned int get_slot_status(struct acpiphp_slot *slot)
568 unsigned long long sta = 0;
569 struct acpiphp_func *func;
572 list_for_each_entry(func, &slot->funcs, sibling) {
573 if (func->flags & FUNC_HAS_STA) {
576 status = acpi_evaluate_integer(func_to_handle(func),
578 if (ACPI_SUCCESS(status) && sta)
581 if (pci_bus_read_dev_vendor_id(slot->bus,
582 PCI_DEVFN(slot->device, func->function),
592 * Check for the slot itself since it may be that the
593 * ACPI slot is a device below PCIe upstream port so in
594 * that case it may not even be reachable yet.
596 if (pci_bus_read_dev_vendor_id(slot->bus,
597 PCI_DEVFN(slot->device, 0), &dvid, 0)) {
602 return (unsigned int)sta;
605 static inline bool device_status_valid(unsigned int sta)
608 * ACPI spec says that _STA may return bit 0 clear with bit 3 set
609 * if the device is valid but does not require a device driver to be
610 * loaded (Section 6.3.7 of ACPI 5.0A).
612 unsigned int mask = ACPI_STA_DEVICE_ENABLED | ACPI_STA_DEVICE_FUNCTIONING;
613 return (sta & mask) == mask;
617 * trim_stale_devices - remove PCI devices that are not responding.
618 * @dev: PCI device to start walking the hierarchy from.
620 static void trim_stale_devices(struct pci_dev *dev)
622 struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
623 struct pci_bus *bus = dev->subordinate;
624 bool alive = dev->ignore_hotplug;
628 unsigned long long sta;
630 status = acpi_evaluate_integer(adev->handle, "_STA", NULL, &sta);
631 alive = alive || (ACPI_SUCCESS(status) && device_status_valid(sta));
634 alive = pci_device_is_present(dev);
637 pci_stop_and_remove_bus_device(dev);
641 struct pci_dev *child, *tmp;
643 /* The device is a bridge. so check the bus below it. */
644 pm_runtime_get_sync(&dev->dev);
645 list_for_each_entry_safe_reverse(child, tmp, &bus->devices, bus_list)
646 trim_stale_devices(child);
648 pm_runtime_put(&dev->dev);
653 * acpiphp_check_bridge - re-enumerate devices
654 * @bridge: where to begin re-enumeration
656 * Iterate over all slots under this bridge and make sure that if a
657 * card is present they are enabled, and if not they are disabled.
659 static void acpiphp_check_bridge(struct acpiphp_bridge *bridge)
661 struct acpiphp_slot *slot;
663 /* Bail out if the bridge is going away. */
664 if (bridge->is_going_away)
668 pm_runtime_get_sync(&bridge->pci_dev->dev);
670 list_for_each_entry(slot, &bridge->slots, node) {
671 struct pci_bus *bus = slot->bus;
672 struct pci_dev *dev, *tmp;
674 if (slot_no_hotplug(slot)) {
676 } else if (device_status_valid(get_slot_status(slot))) {
677 /* remove stale devices if any */
678 list_for_each_entry_safe_reverse(dev, tmp,
679 &bus->devices, bus_list)
680 if (PCI_SLOT(dev->devfn) == slot->device)
681 trim_stale_devices(dev);
683 /* configure all functions */
691 pm_runtime_put(&bridge->pci_dev->dev);
695 * Remove devices for which we could not assign resources, call
696 * arch specific code to fix-up the bus
698 static void acpiphp_sanitize_bus(struct pci_bus *bus)
700 struct pci_dev *dev, *tmp;
702 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM;
704 list_for_each_entry_safe_reverse(dev, tmp, &bus->devices, bus_list) {
705 for (i = 0; i < PCI_BRIDGE_RESOURCES; i++) {
706 struct resource *res = &dev->resource[i];
707 if ((res->flags & type_mask) && !res->start &&
709 /* Could not assign a required resources
710 * for this device, remove it */
711 pci_stop_and_remove_bus_device(dev);
719 * ACPI event handlers
722 void acpiphp_check_host_bridge(struct acpi_device *adev)
724 struct acpiphp_bridge *bridge = NULL;
726 acpi_lock_hp_context();
728 bridge = to_acpiphp_root_context(adev->hp)->root_bridge;
732 acpi_unlock_hp_context();
734 pci_lock_rescan_remove();
736 acpiphp_check_bridge(bridge);
738 pci_unlock_rescan_remove();
743 static int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot);
745 static void hotplug_event(u32 type, struct acpiphp_context *context)
747 acpi_handle handle = context->hp.self->handle;
748 struct acpiphp_func *func = &context->func;
749 struct acpiphp_slot *slot = func->slot;
750 struct acpiphp_bridge *bridge;
752 acpi_lock_hp_context();
753 bridge = context->bridge;
757 acpi_unlock_hp_context();
759 pci_lock_rescan_remove();
762 case ACPI_NOTIFY_BUS_CHECK:
763 /* bus re-enumerate */
764 acpi_handle_debug(handle, "Bus check in %s()\n", __func__);
766 acpiphp_check_bridge(bridge);
767 else if (!(slot->flags & SLOT_IS_GOING_AWAY))
772 case ACPI_NOTIFY_DEVICE_CHECK:
774 acpi_handle_debug(handle, "Device check in %s()\n", __func__);
776 acpiphp_check_bridge(bridge);
777 } else if (!(slot->flags & SLOT_IS_GOING_AWAY)) {
779 * Check if anything has changed in the slot and rescan
780 * from the parent if that's the case.
782 if (acpiphp_rescan_slot(slot))
783 acpiphp_check_bridge(func->parent);
787 case ACPI_NOTIFY_EJECT_REQUEST:
788 /* request device eject */
789 acpi_handle_debug(handle, "Eject request in %s()\n", __func__);
790 acpiphp_disable_and_eject_slot(slot);
794 pci_unlock_rescan_remove();
799 static int acpiphp_hotplug_notify(struct acpi_device *adev, u32 type)
801 struct acpiphp_context *context;
803 context = acpiphp_grab_context(adev);
807 hotplug_event(type, context);
808 acpiphp_let_context_go(context);
813 * acpiphp_enumerate_slots - Enumerate PCI slots for a given bus.
814 * @bus: PCI bus to enumerate the slots for.
816 * A "slot" is an object associated with a PCI device number. All functions
817 * (PCI devices) with the same bus and device number belong to the same slot.
819 void acpiphp_enumerate_slots(struct pci_bus *bus)
821 struct acpiphp_bridge *bridge;
822 struct acpi_device *adev;
826 if (acpiphp_disabled)
829 adev = ACPI_COMPANION(bus->bridge);
833 handle = adev->handle;
834 bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
836 acpi_handle_err(handle, "No memory for bridge object\n");
840 INIT_LIST_HEAD(&bridge->slots);
841 kref_init(&bridge->ref);
842 bridge->pci_dev = pci_dev_get(bus->self);
843 bridge->pci_bus = bus;
846 * Grab a ref to the subordinate PCI bus in case the bus is
847 * removed via PCI core logical hotplug. The ref pins the bus
848 * (which we access during module unload).
850 get_device(&bus->dev);
852 acpi_lock_hp_context();
853 if (pci_is_root_bus(bridge->pci_bus)) {
854 struct acpiphp_root_context *root_context;
856 root_context = kzalloc(sizeof(*root_context), GFP_KERNEL);
860 root_context->root_bridge = bridge;
861 acpi_set_hp_context(adev, &root_context->hp);
863 struct acpiphp_context *context;
866 * This bridge should have been registered as a hotplug function
867 * under its parent, so the context should be there, unless the
868 * parent is going to be handled by pciehp, in which case this
869 * bridge is not interesting to us either.
871 context = acpiphp_get_context(adev);
875 bridge->context = context;
876 context->bridge = bridge;
877 /* Get a reference to the parent bridge. */
878 get_bridge(context->func.parent);
880 acpi_unlock_hp_context();
882 /* Must be added to the list prior to calling acpiphp_add_context(). */
883 mutex_lock(&bridge_mutex);
884 list_add(&bridge->list, &bridge_list);
885 mutex_unlock(&bridge_mutex);
887 /* register all slot objects under this bridge */
888 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1,
889 acpiphp_add_context, NULL, bridge, NULL);
890 if (ACPI_FAILURE(status)) {
891 acpi_handle_err(handle, "failed to register slots\n");
892 cleanup_bridge(bridge);
898 acpi_unlock_hp_context();
899 put_device(&bus->dev);
900 pci_dev_put(bridge->pci_dev);
904 static void acpiphp_drop_bridge(struct acpiphp_bridge *bridge)
906 if (pci_is_root_bus(bridge->pci_bus)) {
907 struct acpiphp_root_context *root_context;
908 struct acpi_device *adev;
910 acpi_lock_hp_context();
911 adev = ACPI_COMPANION(bridge->pci_bus->bridge);
912 root_context = to_acpiphp_root_context(adev->hp);
914 acpi_unlock_hp_context();
917 cleanup_bridge(bridge);
922 * acpiphp_remove_slots - Remove slot objects associated with a given bus.
923 * @bus: PCI bus to remove the slot objects for.
925 void acpiphp_remove_slots(struct pci_bus *bus)
927 struct acpiphp_bridge *bridge;
929 if (acpiphp_disabled)
932 mutex_lock(&bridge_mutex);
933 list_for_each_entry(bridge, &bridge_list, list)
934 if (bridge->pci_bus == bus) {
935 mutex_unlock(&bridge_mutex);
936 acpiphp_drop_bridge(bridge);
940 mutex_unlock(&bridge_mutex);
944 * acpiphp_enable_slot - power on slot
945 * @slot: ACPI PHP slot
947 int acpiphp_enable_slot(struct acpiphp_slot *slot)
949 pci_lock_rescan_remove();
951 if (slot->flags & SLOT_IS_GOING_AWAY) {
952 pci_unlock_rescan_remove();
956 /* configure all functions */
957 if (!(slot->flags & SLOT_ENABLED))
960 pci_unlock_rescan_remove();
965 * acpiphp_disable_and_eject_slot - power off and eject slot
966 * @slot: ACPI PHP slot
968 static int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot)
970 struct acpiphp_func *func;
972 if (slot->flags & SLOT_IS_GOING_AWAY)
975 /* unconfigure all functions */
978 list_for_each_entry(func, &slot->funcs, sibling)
979 if (func->flags & FUNC_HAS_EJ0) {
980 acpi_handle handle = func_to_handle(func);
982 if (ACPI_FAILURE(acpi_evaluate_ej0(handle)))
983 acpi_handle_err(handle, "_EJ0 failed\n");
991 int acpiphp_disable_slot(struct acpiphp_slot *slot)
996 * Acquire acpi_scan_lock to ensure that the execution of _EJ0 in
997 * acpiphp_disable_and_eject_slot() will be synchronized properly.
999 acpi_scan_lock_acquire();
1000 pci_lock_rescan_remove();
1001 ret = acpiphp_disable_and_eject_slot(slot);
1002 pci_unlock_rescan_remove();
1003 acpi_scan_lock_release();
1011 u8 acpiphp_get_power_status(struct acpiphp_slot *slot)
1013 return (slot->flags & SLOT_ENABLED);
1020 u8 acpiphp_get_latch_status(struct acpiphp_slot *slot)
1022 return !(get_slot_status(slot) & ACPI_STA_DEVICE_UI);
1026 * adapter presence : 1
1029 u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot)
1031 return !!get_slot_status(slot);