1 // SPDX-License-Identifier: GPL-2.0+
3 * ACPI PCI HotPlug glue functions to ACPI CA subsystem
5 * Copyright (C) 2002,2003 Takayoshi Kochi (t-kochi@bq.jp.nec.com)
6 * Copyright (C) 2002 Hiroshi Aono (h-aono@ap.jp.nec.com)
7 * Copyright (C) 2002,2003 NEC Corporation
8 * Copyright (C) 2003-2005 Matthew Wilcox (matthew.wilcox@hp.com)
9 * Copyright (C) 2003-2005 Hewlett Packard
10 * Copyright (C) 2005 Rajesh Shah (rajesh.shah@intel.com)
11 * Copyright (C) 2005 Intel Corporation
13 * All rights reserved.
15 * Send feedback to <kristen.c.accardi@intel.com>
20 * Lifetime rules for pci_dev:
21 * - The one in acpiphp_bridge has its refcount elevated by pci_get_slot()
22 * when the bridge is scanned and it loses a refcount when the bridge
24 * - When a P2P bridge is present, we elevate the refcount on the subordinate
25 * bus. It loses the refcount when the the driver unloads.
28 #define pr_fmt(fmt) "acpiphp_glue: " fmt
30 #include <linux/module.h>
32 #include <linux/kernel.h>
33 #include <linux/pci.h>
34 #include <linux/pci_hotplug.h>
35 #include <linux/pci-acpi.h>
36 #include <linux/pm_runtime.h>
37 #include <linux/mutex.h>
38 #include <linux/slab.h>
39 #include <linux/acpi.h>
44 static LIST_HEAD(bridge_list);
45 static DEFINE_MUTEX(bridge_mutex);
47 static int acpiphp_hotplug_notify(struct acpi_device *adev, u32 type);
48 static void acpiphp_post_dock_fixup(struct acpi_device *adev);
49 static void acpiphp_sanitize_bus(struct pci_bus *bus);
50 static void hotplug_event(u32 type, struct acpiphp_context *context);
51 static void free_bridge(struct kref *kref);
54 * acpiphp_init_context - Create hotplug context and grab a reference to it.
55 * @adev: ACPI device object to create the context for.
57 * Call under acpi_hp_context_lock.
59 static struct acpiphp_context *acpiphp_init_context(struct acpi_device *adev)
61 struct acpiphp_context *context;
63 context = kzalloc(sizeof(*context), GFP_KERNEL);
67 context->refcount = 1;
68 context->hp.notify = acpiphp_hotplug_notify;
69 context->hp.fixup = acpiphp_post_dock_fixup;
70 acpi_set_hp_context(adev, &context->hp);
75 * acpiphp_get_context - Get hotplug context and grab a reference to it.
76 * @adev: ACPI device object to get the context for.
78 * Call under acpi_hp_context_lock.
80 static struct acpiphp_context *acpiphp_get_context(struct acpi_device *adev)
82 struct acpiphp_context *context;
87 context = to_acpiphp_context(adev->hp);
93 * acpiphp_put_context - Drop a reference to ACPI hotplug context.
94 * @context: ACPI hotplug context to drop a reference to.
96 * The context object is removed if there are no more references to it.
98 * Call under acpi_hp_context_lock.
100 static void acpiphp_put_context(struct acpiphp_context *context)
102 if (--context->refcount)
105 WARN_ON(context->bridge);
106 context->hp.self->hp = NULL;
110 static inline void get_bridge(struct acpiphp_bridge *bridge)
112 kref_get(&bridge->ref);
115 static inline void put_bridge(struct acpiphp_bridge *bridge)
117 kref_put(&bridge->ref, free_bridge);
120 static struct acpiphp_context *acpiphp_grab_context(struct acpi_device *adev)
122 struct acpiphp_context *context;
124 acpi_lock_hp_context();
125 context = acpiphp_get_context(adev);
126 if (!context || context->func.parent->is_going_away) {
127 acpi_unlock_hp_context();
130 get_bridge(context->func.parent);
131 acpiphp_put_context(context);
132 acpi_unlock_hp_context();
136 static void acpiphp_let_context_go(struct acpiphp_context *context)
138 put_bridge(context->func.parent);
141 static void free_bridge(struct kref *kref)
143 struct acpiphp_context *context;
144 struct acpiphp_bridge *bridge;
145 struct acpiphp_slot *slot, *next;
146 struct acpiphp_func *func, *tmp;
148 acpi_lock_hp_context();
150 bridge = container_of(kref, struct acpiphp_bridge, ref);
152 list_for_each_entry_safe(slot, next, &bridge->slots, node) {
153 list_for_each_entry_safe(func, tmp, &slot->funcs, sibling)
154 acpiphp_put_context(func_to_context(func));
159 context = bridge->context;
160 /* Root bridges will not have hotplug context. */
162 /* Release the reference taken by acpiphp_enumerate_slots(). */
163 put_bridge(context->func.parent);
164 context->bridge = NULL;
165 acpiphp_put_context(context);
168 put_device(&bridge->pci_bus->dev);
169 pci_dev_put(bridge->pci_dev);
172 acpi_unlock_hp_context();
176 * acpiphp_post_dock_fixup - Post-dock fixups for PCI devices.
177 * @adev: ACPI device object corresponding to a PCI device.
179 * TBD - figure out a way to only call fixups for systems that require them.
181 static void acpiphp_post_dock_fixup(struct acpi_device *adev)
183 struct acpiphp_context *context = acpiphp_grab_context(adev);
190 bus = context->func.slot->bus;
194 /* fixup bad _DCK function that rewrites
195 * secondary bridge on slot
197 pci_read_config_dword(bus->self, PCI_PRIMARY_BUS, &buses);
199 if (((buses >> 8) & 0xff) != bus->busn_res.start) {
200 buses = (buses & 0xff000000)
201 | ((unsigned int)(bus->primary) << 0)
202 | ((unsigned int)(bus->busn_res.start) << 8)
203 | ((unsigned int)(bus->busn_res.end) << 16);
204 pci_write_config_dword(bus->self, PCI_PRIMARY_BUS, buses);
208 acpiphp_let_context_go(context);
212 * acpiphp_add_context - Add ACPIPHP context to an ACPI device object.
213 * @handle: ACPI handle of the object to add a context to.
215 * @data: The object's parent ACPIPHP bridge.
218 static acpi_status acpiphp_add_context(acpi_handle handle, u32 lvl, void *data,
221 struct acpiphp_bridge *bridge = data;
222 struct acpiphp_context *context;
223 struct acpi_device *adev;
224 struct acpiphp_slot *slot;
225 struct acpiphp_func *newfunc;
226 acpi_status status = AE_OK;
227 unsigned long long adr;
228 int device, function;
229 struct pci_bus *pbus = bridge->pci_bus;
230 struct pci_dev *pdev = bridge->pci_dev;
233 status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr);
234 if (ACPI_FAILURE(status)) {
235 if (status != AE_NOT_FOUND)
236 acpi_handle_warn(handle,
237 "can't evaluate _ADR (%#x)\n", status);
240 if (acpi_bus_get_device(handle, &adev))
243 device = (adr >> 16) & 0xffff;
244 function = adr & 0xffff;
246 acpi_lock_hp_context();
247 context = acpiphp_init_context(adev);
249 acpi_unlock_hp_context();
250 acpi_handle_err(handle, "No hotplug context\n");
253 newfunc = &context->func;
254 newfunc->function = function;
255 newfunc->parent = bridge;
256 acpi_unlock_hp_context();
259 * If this is a dock device, its _EJ0 should be executed by the dock
260 * notify handler after calling _DCK.
262 if (!is_dock_device(adev) && acpi_has_method(handle, "_EJ0"))
263 newfunc->flags = FUNC_HAS_EJ0;
265 if (acpi_has_method(handle, "_STA"))
266 newfunc->flags |= FUNC_HAS_STA;
268 /* search for objects that share the same slot */
269 list_for_each_entry(slot, &bridge->slots, node)
270 if (slot->device == device)
273 slot = kzalloc(sizeof(struct acpiphp_slot), GFP_KERNEL);
275 acpi_lock_hp_context();
276 acpiphp_put_context(context);
277 acpi_unlock_hp_context();
281 slot->bus = bridge->pci_bus;
282 slot->device = device;
283 INIT_LIST_HEAD(&slot->funcs);
285 list_add_tail(&slot->node, &bridge->slots);
288 * Expose slots to user space for functions that have _EJ0 or _RMV or
289 * are located in dock stations. Do not expose them for devices handled
290 * by the native PCIe hotplug (PCIeHP), becuase that code is supposed to
291 * expose slots to user space in those cases.
293 if ((acpi_pci_check_ejectable(pbus, handle) || is_dock_device(adev))
294 && !(pdev && pdev->is_hotplug_bridge && pciehp_is_native(pdev))) {
295 unsigned long long sun;
299 status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun);
300 if (ACPI_FAILURE(status))
301 sun = bridge->nr_slots;
303 pr_debug("found ACPI PCI Hotplug slot %llu at PCI %04x:%02x:%02x\n",
304 sun, pci_domain_nr(pbus), pbus->number, device);
306 retval = acpiphp_register_hotplug_slot(slot, sun);
310 if (retval == -EBUSY)
311 pr_warn("Slot %llu already registered by another hotplug driver\n", sun);
313 pr_warn("acpiphp_register_hotplug_slot failed (err code = 0x%x)\n", retval);
315 /* Even if the slot registration fails, we can still use it. */
319 newfunc->slot = slot;
320 list_add_tail(&newfunc->sibling, &slot->funcs);
322 if (pci_bus_read_dev_vendor_id(pbus, PCI_DEVFN(device, function),
324 slot->flags |= SLOT_ENABLED;
329 static void cleanup_bridge(struct acpiphp_bridge *bridge)
331 struct acpiphp_slot *slot;
332 struct acpiphp_func *func;
334 list_for_each_entry(slot, &bridge->slots, node) {
335 list_for_each_entry(func, &slot->funcs, sibling) {
336 struct acpi_device *adev = func_to_acpi_device(func);
338 acpi_lock_hp_context();
339 adev->hp->notify = NULL;
340 adev->hp->fixup = NULL;
341 acpi_unlock_hp_context();
343 slot->flags |= SLOT_IS_GOING_AWAY;
345 acpiphp_unregister_hotplug_slot(slot);
348 mutex_lock(&bridge_mutex);
349 list_del(&bridge->list);
350 mutex_unlock(&bridge_mutex);
352 acpi_lock_hp_context();
353 bridge->is_going_away = true;
354 acpi_unlock_hp_context();
358 * acpiphp_max_busnr - return the highest reserved bus number under the given bus.
359 * @bus: bus to start search with
361 static unsigned char acpiphp_max_busnr(struct pci_bus *bus)
364 unsigned char max, n;
367 * pci_bus_max_busnr will return the highest
368 * reserved busnr for all these children.
369 * that is equivalent to the bus->subordinate
370 * value. We don't want to use the parent's
371 * bus->subordinate value because it could have
374 max = bus->busn_res.start;
376 list_for_each_entry(tmp, &bus->children, node) {
377 n = pci_bus_max_busnr(tmp);
384 static void acpiphp_set_acpi_region(struct acpiphp_slot *slot)
386 struct acpiphp_func *func;
387 union acpi_object params[2];
388 struct acpi_object_list arg_list;
390 list_for_each_entry(func, &slot->funcs, sibling) {
392 arg_list.pointer = params;
393 params[0].type = ACPI_TYPE_INTEGER;
394 params[0].integer.value = ACPI_ADR_SPACE_PCI_CONFIG;
395 params[1].type = ACPI_TYPE_INTEGER;
396 params[1].integer.value = 1;
397 /* _REG is optional, we don't care about if there is failure */
398 acpi_evaluate_object(func_to_handle(func), "_REG", &arg_list,
403 static void check_hotplug_bridge(struct acpiphp_slot *slot, struct pci_dev *dev)
405 struct acpiphp_func *func;
407 /* quirk, or pcie could set it already */
408 if (dev->is_hotplug_bridge)
411 list_for_each_entry(func, &slot->funcs, sibling) {
412 if (PCI_FUNC(dev->devfn) == func->function) {
413 dev->is_hotplug_bridge = 1;
419 static int acpiphp_rescan_slot(struct acpiphp_slot *slot)
421 struct acpiphp_func *func;
423 list_for_each_entry(func, &slot->funcs, sibling) {
424 struct acpi_device *adev = func_to_acpi_device(func);
426 acpi_bus_scan(adev->handle);
427 if (acpi_device_enumerated(adev))
428 acpi_device_set_power(adev, ACPI_STATE_D0);
430 return pci_scan_slot(slot->bus, PCI_DEVFN(slot->device, 0));
434 * enable_slot - enable, configure a slot
435 * @slot: slot to be enabled
437 * This function should be called per *physical slot*,
438 * not per each slot object in ACPI namespace.
440 static void enable_slot(struct acpiphp_slot *slot)
443 struct pci_bus *bus = slot->bus;
444 struct acpiphp_func *func;
448 acpiphp_rescan_slot(slot);
449 max = acpiphp_max_busnr(bus);
450 for (pass = 0; pass < 2; pass++) {
451 for_each_pci_bridge(dev, bus) {
452 if (PCI_SLOT(dev->devfn) != slot->device)
455 max = pci_scan_bridge(bus, dev, max, pass);
456 if (pass && dev->subordinate) {
457 check_hotplug_bridge(slot, dev);
458 pcibios_resource_survey_bus(dev->subordinate);
459 __pci_bus_size_bridges(dev->subordinate, &add_list);
463 __pci_bus_assign_resources(bus, &add_list, NULL);
465 acpiphp_sanitize_bus(bus);
466 pcie_bus_configure_settings(bus);
467 acpiphp_set_acpi_region(slot);
469 list_for_each_entry(dev, &bus->devices, bus_list) {
470 /* Assume that newly added devices are powered on already. */
472 dev->current_state = PCI_D0;
475 pci_bus_add_devices(bus);
477 slot->flags |= SLOT_ENABLED;
478 list_for_each_entry(func, &slot->funcs, sibling) {
479 dev = pci_get_slot(bus, PCI_DEVFN(slot->device,
482 /* Do not set SLOT_ENABLED flag if some funcs
484 slot->flags &= (~SLOT_ENABLED);
491 * disable_slot - disable a slot
492 * @slot: ACPI PHP slot
494 static void disable_slot(struct acpiphp_slot *slot)
496 struct pci_bus *bus = slot->bus;
497 struct pci_dev *dev, *prev;
498 struct acpiphp_func *func;
501 * enable_slot() enumerates all functions in this device via
502 * pci_scan_slot(), whether they have associated ACPI hotplug
503 * methods (_EJ0, etc.) or not. Therefore, we remove all functions
506 list_for_each_entry_safe_reverse(dev, prev, &bus->devices, bus_list)
507 if (PCI_SLOT(dev->devfn) == slot->device)
508 pci_stop_and_remove_bus_device(dev);
510 list_for_each_entry(func, &slot->funcs, sibling)
511 acpi_bus_trim(func_to_acpi_device(func));
513 slot->flags &= (~SLOT_ENABLED);
516 static bool slot_no_hotplug(struct acpiphp_slot *slot)
518 struct pci_bus *bus = slot->bus;
521 list_for_each_entry(dev, &bus->devices, bus_list) {
522 if (PCI_SLOT(dev->devfn) == slot->device && dev->ignore_hotplug)
529 * get_slot_status - get ACPI slot status
530 * @slot: ACPI PHP slot
532 * If a slot has _STA for each function and if any one of them
533 * returned non-zero status, return it.
535 * If a slot doesn't have _STA and if any one of its functions'
536 * configuration space is configured, return 0x0f as a _STA.
538 * Otherwise return 0.
540 static unsigned int get_slot_status(struct acpiphp_slot *slot)
542 unsigned long long sta = 0;
543 struct acpiphp_func *func;
546 list_for_each_entry(func, &slot->funcs, sibling) {
547 if (func->flags & FUNC_HAS_STA) {
550 status = acpi_evaluate_integer(func_to_handle(func),
552 if (ACPI_SUCCESS(status) && sta)
555 if (pci_bus_read_dev_vendor_id(slot->bus,
556 PCI_DEVFN(slot->device, func->function),
566 * Check for the slot itself since it may be that the
567 * ACPI slot is a device below PCIe upstream port so in
568 * that case it may not even be reachable yet.
570 if (pci_bus_read_dev_vendor_id(slot->bus,
571 PCI_DEVFN(slot->device, 0), &dvid, 0)) {
576 return (unsigned int)sta;
579 static inline bool device_status_valid(unsigned int sta)
582 * ACPI spec says that _STA may return bit 0 clear with bit 3 set
583 * if the device is valid but does not require a device driver to be
584 * loaded (Section 6.3.7 of ACPI 5.0A).
586 unsigned int mask = ACPI_STA_DEVICE_ENABLED | ACPI_STA_DEVICE_FUNCTIONING;
587 return (sta & mask) == mask;
591 * trim_stale_devices - remove PCI devices that are not responding.
592 * @dev: PCI device to start walking the hierarchy from.
594 static void trim_stale_devices(struct pci_dev *dev)
596 struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
597 struct pci_bus *bus = dev->subordinate;
598 bool alive = dev->ignore_hotplug;
602 unsigned long long sta;
604 status = acpi_evaluate_integer(adev->handle, "_STA", NULL, &sta);
605 alive = alive || (ACPI_SUCCESS(status) && device_status_valid(sta));
608 alive = pci_device_is_present(dev);
611 pci_stop_and_remove_bus_device(dev);
615 struct pci_dev *child, *tmp;
617 /* The device is a bridge. so check the bus below it. */
618 pm_runtime_get_sync(&dev->dev);
619 list_for_each_entry_safe_reverse(child, tmp, &bus->devices, bus_list)
620 trim_stale_devices(child);
622 pm_runtime_put(&dev->dev);
627 * acpiphp_check_bridge - re-enumerate devices
628 * @bridge: where to begin re-enumeration
630 * Iterate over all slots under this bridge and make sure that if a
631 * card is present they are enabled, and if not they are disabled.
633 static void acpiphp_check_bridge(struct acpiphp_bridge *bridge)
635 struct acpiphp_slot *slot;
637 /* Bail out if the bridge is going away. */
638 if (bridge->is_going_away)
642 pm_runtime_get_sync(&bridge->pci_dev->dev);
644 list_for_each_entry(slot, &bridge->slots, node) {
645 struct pci_bus *bus = slot->bus;
646 struct pci_dev *dev, *tmp;
648 if (slot_no_hotplug(slot)) {
650 } else if (device_status_valid(get_slot_status(slot))) {
651 /* remove stale devices if any */
652 list_for_each_entry_safe_reverse(dev, tmp,
653 &bus->devices, bus_list)
654 if (PCI_SLOT(dev->devfn) == slot->device)
655 trim_stale_devices(dev);
657 /* configure all functions */
665 pm_runtime_put(&bridge->pci_dev->dev);
669 * Remove devices for which we could not assign resources, call
670 * arch specific code to fix-up the bus
672 static void acpiphp_sanitize_bus(struct pci_bus *bus)
674 struct pci_dev *dev, *tmp;
676 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM;
678 list_for_each_entry_safe_reverse(dev, tmp, &bus->devices, bus_list) {
679 for (i = 0; i < PCI_BRIDGE_RESOURCES; i++) {
680 struct resource *res = &dev->resource[i];
681 if ((res->flags & type_mask) && !res->start &&
683 /* Could not assign a required resources
684 * for this device, remove it */
685 pci_stop_and_remove_bus_device(dev);
693 * ACPI event handlers
696 void acpiphp_check_host_bridge(struct acpi_device *adev)
698 struct acpiphp_bridge *bridge = NULL;
700 acpi_lock_hp_context();
702 bridge = to_acpiphp_root_context(adev->hp)->root_bridge;
706 acpi_unlock_hp_context();
708 pci_lock_rescan_remove();
710 acpiphp_check_bridge(bridge);
712 pci_unlock_rescan_remove();
717 static int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot);
719 static void hotplug_event(u32 type, struct acpiphp_context *context)
721 acpi_handle handle = context->hp.self->handle;
722 struct acpiphp_func *func = &context->func;
723 struct acpiphp_slot *slot = func->slot;
724 struct acpiphp_bridge *bridge;
726 acpi_lock_hp_context();
727 bridge = context->bridge;
731 acpi_unlock_hp_context();
733 pci_lock_rescan_remove();
736 case ACPI_NOTIFY_BUS_CHECK:
737 /* bus re-enumerate */
738 acpi_handle_debug(handle, "Bus check in %s()\n", __func__);
740 acpiphp_check_bridge(bridge);
741 else if (!(slot->flags & SLOT_IS_GOING_AWAY))
746 case ACPI_NOTIFY_DEVICE_CHECK:
748 acpi_handle_debug(handle, "Device check in %s()\n", __func__);
750 acpiphp_check_bridge(bridge);
751 } else if (!(slot->flags & SLOT_IS_GOING_AWAY)) {
753 * Check if anything has changed in the slot and rescan
754 * from the parent if that's the case.
756 if (acpiphp_rescan_slot(slot))
757 acpiphp_check_bridge(func->parent);
761 case ACPI_NOTIFY_EJECT_REQUEST:
762 /* request device eject */
763 acpi_handle_debug(handle, "Eject request in %s()\n", __func__);
764 acpiphp_disable_and_eject_slot(slot);
768 pci_unlock_rescan_remove();
773 static int acpiphp_hotplug_notify(struct acpi_device *adev, u32 type)
775 struct acpiphp_context *context;
777 context = acpiphp_grab_context(adev);
781 hotplug_event(type, context);
782 acpiphp_let_context_go(context);
787 * acpiphp_enumerate_slots - Enumerate PCI slots for a given bus.
788 * @bus: PCI bus to enumerate the slots for.
790 * A "slot" is an object associated with a PCI device number. All functions
791 * (PCI devices) with the same bus and device number belong to the same slot.
793 void acpiphp_enumerate_slots(struct pci_bus *bus)
795 struct acpiphp_bridge *bridge;
796 struct acpi_device *adev;
800 if (acpiphp_disabled)
803 adev = ACPI_COMPANION(bus->bridge);
807 handle = adev->handle;
808 bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
812 INIT_LIST_HEAD(&bridge->slots);
813 kref_init(&bridge->ref);
814 bridge->pci_dev = pci_dev_get(bus->self);
815 bridge->pci_bus = bus;
818 * Grab a ref to the subordinate PCI bus in case the bus is
819 * removed via PCI core logical hotplug. The ref pins the bus
820 * (which we access during module unload).
822 get_device(&bus->dev);
824 acpi_lock_hp_context();
825 if (pci_is_root_bus(bridge->pci_bus)) {
826 struct acpiphp_root_context *root_context;
828 root_context = kzalloc(sizeof(*root_context), GFP_KERNEL);
832 root_context->root_bridge = bridge;
833 acpi_set_hp_context(adev, &root_context->hp);
835 struct acpiphp_context *context;
838 * This bridge should have been registered as a hotplug function
839 * under its parent, so the context should be there, unless the
840 * parent is going to be handled by pciehp, in which case this
841 * bridge is not interesting to us either.
843 context = acpiphp_get_context(adev);
847 bridge->context = context;
848 context->bridge = bridge;
849 /* Get a reference to the parent bridge. */
850 get_bridge(context->func.parent);
852 acpi_unlock_hp_context();
854 /* Must be added to the list prior to calling acpiphp_add_context(). */
855 mutex_lock(&bridge_mutex);
856 list_add(&bridge->list, &bridge_list);
857 mutex_unlock(&bridge_mutex);
859 /* register all slot objects under this bridge */
860 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1,
861 acpiphp_add_context, NULL, bridge, NULL);
862 if (ACPI_FAILURE(status)) {
863 acpi_handle_err(handle, "failed to register slots\n");
864 cleanup_bridge(bridge);
870 acpi_unlock_hp_context();
871 put_device(&bus->dev);
872 pci_dev_put(bridge->pci_dev);
876 static void acpiphp_drop_bridge(struct acpiphp_bridge *bridge)
878 if (pci_is_root_bus(bridge->pci_bus)) {
879 struct acpiphp_root_context *root_context;
880 struct acpi_device *adev;
882 acpi_lock_hp_context();
883 adev = ACPI_COMPANION(bridge->pci_bus->bridge);
884 root_context = to_acpiphp_root_context(adev->hp);
886 acpi_unlock_hp_context();
889 cleanup_bridge(bridge);
894 * acpiphp_remove_slots - Remove slot objects associated with a given bus.
895 * @bus: PCI bus to remove the slot objects for.
897 void acpiphp_remove_slots(struct pci_bus *bus)
899 struct acpiphp_bridge *bridge;
901 if (acpiphp_disabled)
904 mutex_lock(&bridge_mutex);
905 list_for_each_entry(bridge, &bridge_list, list)
906 if (bridge->pci_bus == bus) {
907 mutex_unlock(&bridge_mutex);
908 acpiphp_drop_bridge(bridge);
912 mutex_unlock(&bridge_mutex);
916 * acpiphp_enable_slot - power on slot
917 * @slot: ACPI PHP slot
919 int acpiphp_enable_slot(struct acpiphp_slot *slot)
921 pci_lock_rescan_remove();
923 if (slot->flags & SLOT_IS_GOING_AWAY) {
924 pci_unlock_rescan_remove();
928 /* configure all functions */
929 if (!(slot->flags & SLOT_ENABLED))
932 pci_unlock_rescan_remove();
937 * acpiphp_disable_and_eject_slot - power off and eject slot
938 * @slot: ACPI PHP slot
940 static int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot)
942 struct acpiphp_func *func;
944 if (slot->flags & SLOT_IS_GOING_AWAY)
947 /* unconfigure all functions */
950 list_for_each_entry(func, &slot->funcs, sibling)
951 if (func->flags & FUNC_HAS_EJ0) {
952 acpi_handle handle = func_to_handle(func);
954 if (ACPI_FAILURE(acpi_evaluate_ej0(handle)))
955 acpi_handle_err(handle, "_EJ0 failed\n");
963 int acpiphp_disable_slot(struct acpiphp_slot *slot)
968 * Acquire acpi_scan_lock to ensure that the execution of _EJ0 in
969 * acpiphp_disable_and_eject_slot() will be synchronized properly.
971 acpi_scan_lock_acquire();
972 pci_lock_rescan_remove();
973 ret = acpiphp_disable_and_eject_slot(slot);
974 pci_unlock_rescan_remove();
975 acpi_scan_lock_release();
983 u8 acpiphp_get_power_status(struct acpiphp_slot *slot)
985 return (slot->flags & SLOT_ENABLED);
992 u8 acpiphp_get_latch_status(struct acpiphp_slot *slot)
994 return !(get_slot_status(slot) & ACPI_STA_DEVICE_UI);
998 * adapter presence : 1
1001 u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot)
1003 return !!get_slot_status(slot);