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();
139 context = acpiphp_get_context(adev);
140 if (!context || context->func.parent->is_going_away) {
141 acpi_unlock_hp_context();
144 get_bridge(context->func.parent);
145 acpiphp_put_context(context);
146 acpi_unlock_hp_context();
150 static void acpiphp_let_context_go(struct acpiphp_context *context)
152 put_bridge(context->func.parent);
155 static void free_bridge(struct kref *kref)
157 struct acpiphp_context *context;
158 struct acpiphp_bridge *bridge;
159 struct acpiphp_slot *slot, *next;
160 struct acpiphp_func *func, *tmp;
162 acpi_lock_hp_context();
164 bridge = container_of(kref, struct acpiphp_bridge, ref);
166 list_for_each_entry_safe(slot, next, &bridge->slots, node) {
167 list_for_each_entry_safe(func, tmp, &slot->funcs, sibling)
168 acpiphp_put_context(func_to_context(func));
173 context = bridge->context;
174 /* Root bridges will not have hotplug context. */
176 /* Release the reference taken by acpiphp_enumerate_slots(). */
177 put_bridge(context->func.parent);
178 context->bridge = NULL;
179 acpiphp_put_context(context);
182 put_device(&bridge->pci_bus->dev);
183 pci_dev_put(bridge->pci_dev);
186 acpi_unlock_hp_context();
190 * acpiphp_post_dock_fixup - Post-dock fixups for PCI devices.
191 * @adev: ACPI device object corresponding to a PCI device.
193 * TBD - figure out a way to only call fixups for systems that require them.
195 static void acpiphp_post_dock_fixup(struct acpi_device *adev)
197 struct acpiphp_context *context = acpiphp_grab_context(adev);
204 bus = context->func.slot->bus;
208 /* fixup bad _DCK function that rewrites
209 * secondary bridge on slot
211 pci_read_config_dword(bus->self, PCI_PRIMARY_BUS, &buses);
213 if (((buses >> 8) & 0xff) != bus->busn_res.start) {
214 buses = (buses & 0xff000000)
215 | ((unsigned int)(bus->primary) << 0)
216 | ((unsigned int)(bus->busn_res.start) << 8)
217 | ((unsigned int)(bus->busn_res.end) << 16);
218 pci_write_config_dword(bus->self, PCI_PRIMARY_BUS, buses);
222 acpiphp_let_context_go(context);
225 /* Check whether the PCI device is managed by native PCIe hotplug driver */
226 static bool device_is_managed_by_native_pciehp(struct pci_dev *pdev)
230 struct acpi_pci_root *root;
232 /* Check whether the PCIe port supports native PCIe hotplug */
233 if (pcie_capability_read_dword(pdev, PCI_EXP_SLTCAP, ®32))
235 if (!(reg32 & PCI_EXP_SLTCAP_HPC))
239 * Check whether native PCIe hotplug has been enabled for
240 * this PCIe hierarchy.
242 tmp = acpi_find_root_bridge_handle(pdev);
245 root = acpi_pci_find_root(tmp);
248 if (!(root->osc_control_set & OSC_PCI_EXPRESS_NATIVE_HP_CONTROL))
255 * acpiphp_add_context - Add ACPIPHP context to an ACPI device object.
256 * @handle: ACPI handle of the object to add a context to.
258 * @data: The object's parent ACPIPHP bridge.
261 static acpi_status acpiphp_add_context(acpi_handle handle, u32 lvl, void *data,
264 struct acpiphp_bridge *bridge = data;
265 struct acpiphp_context *context;
266 struct acpi_device *adev;
267 struct acpiphp_slot *slot;
268 struct acpiphp_func *newfunc;
269 acpi_status status = AE_OK;
270 unsigned long long adr;
271 int device, function;
272 struct pci_bus *pbus = bridge->pci_bus;
273 struct pci_dev *pdev = bridge->pci_dev;
276 status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr);
277 if (ACPI_FAILURE(status)) {
278 if (status != AE_NOT_FOUND)
279 acpi_handle_warn(handle,
280 "can't evaluate _ADR (%#x)\n", status);
283 if (acpi_bus_get_device(handle, &adev))
286 device = (adr >> 16) & 0xffff;
287 function = adr & 0xffff;
289 acpi_lock_hp_context();
290 context = acpiphp_init_context(adev);
292 acpi_unlock_hp_context();
293 acpi_handle_err(handle, "No hotplug context\n");
296 newfunc = &context->func;
297 newfunc->function = function;
298 newfunc->parent = bridge;
299 acpi_unlock_hp_context();
302 * If this is a dock device, its _EJ0 should be executed by the dock
303 * notify handler after calling _DCK.
305 if (!is_dock_device(adev) && acpi_has_method(handle, "_EJ0"))
306 newfunc->flags = FUNC_HAS_EJ0;
308 if (acpi_has_method(handle, "_STA"))
309 newfunc->flags |= FUNC_HAS_STA;
311 /* search for objects that share the same slot */
312 list_for_each_entry(slot, &bridge->slots, node)
313 if (slot->device == device)
316 slot = kzalloc(sizeof(struct acpiphp_slot), GFP_KERNEL);
318 acpi_lock_hp_context();
319 acpiphp_put_context(context);
320 acpi_unlock_hp_context();
324 slot->bus = bridge->pci_bus;
325 slot->device = device;
326 INIT_LIST_HEAD(&slot->funcs);
328 list_add_tail(&slot->node, &bridge->slots);
331 * Expose slots to user space for functions that have _EJ0 or _RMV or
332 * are located in dock stations. Do not expose them for devices handled
333 * by the native PCIe hotplug (PCIeHP), becuase that code is supposed to
334 * expose slots to user space in those cases.
336 if ((acpi_pci_check_ejectable(pbus, handle) || is_dock_device(adev))
337 && !(pdev && device_is_managed_by_native_pciehp(pdev))) {
338 unsigned long long sun;
342 status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun);
343 if (ACPI_FAILURE(status))
344 sun = bridge->nr_slots;
346 pr_debug("found ACPI PCI Hotplug slot %llu at PCI %04x:%02x:%02x\n",
347 sun, pci_domain_nr(pbus), pbus->number, device);
349 retval = acpiphp_register_hotplug_slot(slot, sun);
353 if (retval == -EBUSY)
354 pr_warn("Slot %llu already registered by another hotplug driver\n", sun);
356 pr_warn("acpiphp_register_hotplug_slot failed (err code = 0x%x)\n", retval);
358 /* Even if the slot registration fails, we can still use it. */
362 newfunc->slot = slot;
363 list_add_tail(&newfunc->sibling, &slot->funcs);
365 if (pci_bus_read_dev_vendor_id(pbus, PCI_DEVFN(device, function),
367 slot->flags |= SLOT_ENABLED;
372 static void cleanup_bridge(struct acpiphp_bridge *bridge)
374 struct acpiphp_slot *slot;
375 struct acpiphp_func *func;
377 list_for_each_entry(slot, &bridge->slots, node) {
378 list_for_each_entry(func, &slot->funcs, sibling) {
379 struct acpi_device *adev = func_to_acpi_device(func);
381 acpi_lock_hp_context();
382 adev->hp->notify = NULL;
383 adev->hp->fixup = NULL;
384 acpi_unlock_hp_context();
386 slot->flags |= SLOT_IS_GOING_AWAY;
388 acpiphp_unregister_hotplug_slot(slot);
391 mutex_lock(&bridge_mutex);
392 list_del(&bridge->list);
393 mutex_unlock(&bridge_mutex);
395 acpi_lock_hp_context();
396 bridge->is_going_away = true;
397 acpi_unlock_hp_context();
401 * acpiphp_max_busnr - return the highest reserved bus number under the given bus.
402 * @bus: bus to start search with
404 static unsigned char acpiphp_max_busnr(struct pci_bus *bus)
407 unsigned char max, n;
410 * pci_bus_max_busnr will return the highest
411 * reserved busnr for all these children.
412 * that is equivalent to the bus->subordinate
413 * value. We don't want to use the parent's
414 * bus->subordinate value because it could have
417 max = bus->busn_res.start;
419 list_for_each_entry(tmp, &bus->children, node) {
420 n = pci_bus_max_busnr(tmp);
427 static void acpiphp_set_acpi_region(struct acpiphp_slot *slot)
429 struct acpiphp_func *func;
430 union acpi_object params[2];
431 struct acpi_object_list arg_list;
433 list_for_each_entry(func, &slot->funcs, sibling) {
435 arg_list.pointer = params;
436 params[0].type = ACPI_TYPE_INTEGER;
437 params[0].integer.value = ACPI_ADR_SPACE_PCI_CONFIG;
438 params[1].type = ACPI_TYPE_INTEGER;
439 params[1].integer.value = 1;
440 /* _REG is optional, we don't care about if there is failure */
441 acpi_evaluate_object(func_to_handle(func), "_REG", &arg_list,
446 static void check_hotplug_bridge(struct acpiphp_slot *slot, struct pci_dev *dev)
448 struct acpiphp_func *func;
450 /* quirk, or pcie could set it already */
451 if (dev->is_hotplug_bridge)
454 list_for_each_entry(func, &slot->funcs, sibling) {
455 if (PCI_FUNC(dev->devfn) == func->function) {
456 dev->is_hotplug_bridge = 1;
462 static int acpiphp_rescan_slot(struct acpiphp_slot *slot)
464 struct acpiphp_func *func;
466 list_for_each_entry(func, &slot->funcs, sibling) {
467 struct acpi_device *adev = func_to_acpi_device(func);
469 acpi_bus_scan(adev->handle);
470 if (acpi_device_enumerated(adev))
471 acpi_device_set_power(adev, ACPI_STATE_D0);
473 return pci_scan_slot(slot->bus, PCI_DEVFN(slot->device, 0));
477 * enable_slot - enable, configure a slot
478 * @slot: slot to be enabled
480 * This function should be called per *physical slot*,
481 * not per each slot object in ACPI namespace.
483 static void enable_slot(struct acpiphp_slot *slot)
486 struct pci_bus *bus = slot->bus;
487 struct acpiphp_func *func;
491 acpiphp_rescan_slot(slot);
492 max = acpiphp_max_busnr(bus);
493 for (pass = 0; pass < 2; pass++) {
494 list_for_each_entry(dev, &bus->devices, bus_list) {
495 if (PCI_SLOT(dev->devfn) != slot->device)
498 if (pci_is_bridge(dev)) {
499 max = pci_scan_bridge(bus, dev, max, pass);
500 if (pass && dev->subordinate) {
501 check_hotplug_bridge(slot, dev);
502 pcibios_resource_survey_bus(dev->subordinate);
503 __pci_bus_size_bridges(dev->subordinate,
509 __pci_bus_assign_resources(bus, &add_list, NULL);
511 acpiphp_sanitize_bus(bus);
512 pcie_bus_configure_settings(bus);
513 acpiphp_set_acpi_region(slot);
515 list_for_each_entry(dev, &bus->devices, bus_list) {
516 /* Assume that newly added devices are powered on already. */
518 dev->current_state = PCI_D0;
521 pci_bus_add_devices(bus);
523 slot->flags |= SLOT_ENABLED;
524 list_for_each_entry(func, &slot->funcs, sibling) {
525 dev = pci_get_slot(bus, PCI_DEVFN(slot->device,
528 /* Do not set SLOT_ENABLED flag if some funcs
530 slot->flags &= (~SLOT_ENABLED);
537 * disable_slot - disable a slot
538 * @slot: ACPI PHP slot
540 static void disable_slot(struct acpiphp_slot *slot)
542 struct pci_bus *bus = slot->bus;
543 struct pci_dev *dev, *prev;
544 struct acpiphp_func *func;
547 * enable_slot() enumerates all functions in this device via
548 * pci_scan_slot(), whether they have associated ACPI hotplug
549 * methods (_EJ0, etc.) or not. Therefore, we remove all functions
552 list_for_each_entry_safe_reverse(dev, prev, &bus->devices, bus_list)
553 if (PCI_SLOT(dev->devfn) == slot->device)
554 pci_stop_and_remove_bus_device(dev);
556 list_for_each_entry(func, &slot->funcs, sibling)
557 acpi_bus_trim(func_to_acpi_device(func));
559 slot->flags &= (~SLOT_ENABLED);
562 static bool slot_no_hotplug(struct acpiphp_slot *slot)
564 struct pci_bus *bus = slot->bus;
567 list_for_each_entry(dev, &bus->devices, bus_list) {
568 if (PCI_SLOT(dev->devfn) == slot->device && dev->ignore_hotplug)
575 * get_slot_status - get ACPI slot status
576 * @slot: ACPI PHP slot
578 * If a slot has _STA for each function and if any one of them
579 * returned non-zero status, return it.
581 * If a slot doesn't have _STA and if any one of its functions'
582 * configuration space is configured, return 0x0f as a _STA.
584 * Otherwise return 0.
586 static unsigned int get_slot_status(struct acpiphp_slot *slot)
588 unsigned long long sta = 0;
589 struct acpiphp_func *func;
591 list_for_each_entry(func, &slot->funcs, sibling) {
592 if (func->flags & FUNC_HAS_STA) {
595 status = acpi_evaluate_integer(func_to_handle(func),
597 if (ACPI_SUCCESS(status) && sta)
602 pci_bus_read_config_dword(slot->bus,
603 PCI_DEVFN(slot->device,
605 PCI_VENDOR_ID, &dvid);
606 if (dvid != 0xffffffff) {
613 return (unsigned int)sta;
616 static inline bool device_status_valid(unsigned int sta)
619 * ACPI spec says that _STA may return bit 0 clear with bit 3 set
620 * if the device is valid but does not require a device driver to be
621 * loaded (Section 6.3.7 of ACPI 5.0A).
623 unsigned int mask = ACPI_STA_DEVICE_ENABLED | ACPI_STA_DEVICE_FUNCTIONING;
624 return (sta & mask) == mask;
628 * trim_stale_devices - remove PCI devices that are not responding.
629 * @dev: PCI device to start walking the hierarchy from.
631 static void trim_stale_devices(struct pci_dev *dev)
633 struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
634 struct pci_bus *bus = dev->subordinate;
635 bool alive = dev->ignore_hotplug;
639 unsigned long long sta;
641 status = acpi_evaluate_integer(adev->handle, "_STA", NULL, &sta);
642 alive = alive || (ACPI_SUCCESS(status) && device_status_valid(sta));
645 alive = pci_device_is_present(dev);
648 pci_stop_and_remove_bus_device(dev);
652 struct pci_dev *child, *tmp;
654 /* The device is a bridge. so check the bus below it. */
655 pm_runtime_get_sync(&dev->dev);
656 list_for_each_entry_safe_reverse(child, tmp, &bus->devices, bus_list)
657 trim_stale_devices(child);
659 pm_runtime_put(&dev->dev);
664 * acpiphp_check_bridge - re-enumerate devices
665 * @bridge: where to begin re-enumeration
667 * Iterate over all slots under this bridge and make sure that if a
668 * card is present they are enabled, and if not they are disabled.
670 static void acpiphp_check_bridge(struct acpiphp_bridge *bridge)
672 struct acpiphp_slot *slot;
674 /* Bail out if the bridge is going away. */
675 if (bridge->is_going_away)
679 pm_runtime_get_sync(&bridge->pci_dev->dev);
681 list_for_each_entry(slot, &bridge->slots, node) {
682 struct pci_bus *bus = slot->bus;
683 struct pci_dev *dev, *tmp;
685 if (slot_no_hotplug(slot)) {
687 } else if (device_status_valid(get_slot_status(slot))) {
688 /* remove stale devices if any */
689 list_for_each_entry_safe_reverse(dev, tmp,
690 &bus->devices, bus_list)
691 if (PCI_SLOT(dev->devfn) == slot->device)
692 trim_stale_devices(dev);
694 /* configure all functions */
702 pm_runtime_put(&bridge->pci_dev->dev);
706 * Remove devices for which we could not assign resources, call
707 * arch specific code to fix-up the bus
709 static void acpiphp_sanitize_bus(struct pci_bus *bus)
711 struct pci_dev *dev, *tmp;
713 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM;
715 list_for_each_entry_safe_reverse(dev, tmp, &bus->devices, bus_list) {
716 for (i = 0; i < PCI_BRIDGE_RESOURCES; i++) {
717 struct resource *res = &dev->resource[i];
718 if ((res->flags & type_mask) && !res->start &&
720 /* Could not assign a required resources
721 * for this device, remove it */
722 pci_stop_and_remove_bus_device(dev);
730 * ACPI event handlers
733 void acpiphp_check_host_bridge(struct acpi_device *adev)
735 struct acpiphp_bridge *bridge = NULL;
737 acpi_lock_hp_context();
739 bridge = to_acpiphp_root_context(adev->hp)->root_bridge;
743 acpi_unlock_hp_context();
745 pci_lock_rescan_remove();
747 acpiphp_check_bridge(bridge);
749 pci_unlock_rescan_remove();
754 static int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot);
756 static void hotplug_event(u32 type, struct acpiphp_context *context)
758 acpi_handle handle = context->hp.self->handle;
759 struct acpiphp_func *func = &context->func;
760 struct acpiphp_slot *slot = func->slot;
761 struct acpiphp_bridge *bridge;
763 acpi_lock_hp_context();
764 bridge = context->bridge;
768 acpi_unlock_hp_context();
770 pci_lock_rescan_remove();
773 case ACPI_NOTIFY_BUS_CHECK:
774 /* bus re-enumerate */
775 acpi_handle_debug(handle, "Bus check in %s()\n", __func__);
777 acpiphp_check_bridge(bridge);
778 else if (!(slot->flags & SLOT_IS_GOING_AWAY))
783 case ACPI_NOTIFY_DEVICE_CHECK:
785 acpi_handle_debug(handle, "Device check in %s()\n", __func__);
787 acpiphp_check_bridge(bridge);
788 } else if (!(slot->flags & SLOT_IS_GOING_AWAY)) {
790 * Check if anything has changed in the slot and rescan
791 * from the parent if that's the case.
793 if (acpiphp_rescan_slot(slot))
794 acpiphp_check_bridge(func->parent);
798 case ACPI_NOTIFY_EJECT_REQUEST:
799 /* request device eject */
800 acpi_handle_debug(handle, "Eject request in %s()\n", __func__);
801 acpiphp_disable_and_eject_slot(slot);
805 pci_unlock_rescan_remove();
810 static int acpiphp_hotplug_notify(struct acpi_device *adev, u32 type)
812 struct acpiphp_context *context;
814 context = acpiphp_grab_context(adev);
818 hotplug_event(type, context);
819 acpiphp_let_context_go(context);
824 * acpiphp_enumerate_slots - Enumerate PCI slots for a given bus.
825 * @bus: PCI bus to enumerate the slots for.
827 * A "slot" is an object associated with a PCI device number. All functions
828 * (PCI devices) with the same bus and device number belong to the same slot.
830 void acpiphp_enumerate_slots(struct pci_bus *bus)
832 struct acpiphp_bridge *bridge;
833 struct acpi_device *adev;
837 if (acpiphp_disabled)
840 adev = ACPI_COMPANION(bus->bridge);
844 handle = adev->handle;
845 bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
847 acpi_handle_err(handle, "No memory for bridge object\n");
851 INIT_LIST_HEAD(&bridge->slots);
852 kref_init(&bridge->ref);
853 bridge->pci_dev = pci_dev_get(bus->self);
854 bridge->pci_bus = bus;
857 * Grab a ref to the subordinate PCI bus in case the bus is
858 * removed via PCI core logical hotplug. The ref pins the bus
859 * (which we access during module unload).
861 get_device(&bus->dev);
863 acpi_lock_hp_context();
864 if (pci_is_root_bus(bridge->pci_bus)) {
865 struct acpiphp_root_context *root_context;
867 root_context = kzalloc(sizeof(*root_context), GFP_KERNEL);
871 root_context->root_bridge = bridge;
872 acpi_set_hp_context(adev, &root_context->hp);
874 struct acpiphp_context *context;
877 * This bridge should have been registered as a hotplug function
878 * under its parent, so the context should be there, unless the
879 * parent is going to be handled by pciehp, in which case this
880 * bridge is not interesting to us either.
882 context = acpiphp_get_context(adev);
886 bridge->context = context;
887 context->bridge = bridge;
888 /* Get a reference to the parent bridge. */
889 get_bridge(context->func.parent);
891 acpi_unlock_hp_context();
893 /* Must be added to the list prior to calling acpiphp_add_context(). */
894 mutex_lock(&bridge_mutex);
895 list_add(&bridge->list, &bridge_list);
896 mutex_unlock(&bridge_mutex);
898 /* register all slot objects under this bridge */
899 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1,
900 acpiphp_add_context, NULL, bridge, NULL);
901 if (ACPI_FAILURE(status)) {
902 acpi_handle_err(handle, "failed to register slots\n");
903 cleanup_bridge(bridge);
909 acpi_unlock_hp_context();
910 put_device(&bus->dev);
911 pci_dev_put(bridge->pci_dev);
915 static void acpiphp_drop_bridge(struct acpiphp_bridge *bridge)
917 if (pci_is_root_bus(bridge->pci_bus)) {
918 struct acpiphp_root_context *root_context;
919 struct acpi_device *adev;
921 acpi_lock_hp_context();
922 adev = ACPI_COMPANION(bridge->pci_bus->bridge);
923 root_context = to_acpiphp_root_context(adev->hp);
925 acpi_unlock_hp_context();
928 cleanup_bridge(bridge);
933 * acpiphp_remove_slots - Remove slot objects associated with a given bus.
934 * @bus: PCI bus to remove the slot objects for.
936 void acpiphp_remove_slots(struct pci_bus *bus)
938 struct acpiphp_bridge *bridge;
940 if (acpiphp_disabled)
943 mutex_lock(&bridge_mutex);
944 list_for_each_entry(bridge, &bridge_list, list)
945 if (bridge->pci_bus == bus) {
946 mutex_unlock(&bridge_mutex);
947 acpiphp_drop_bridge(bridge);
951 mutex_unlock(&bridge_mutex);
955 * acpiphp_enable_slot - power on slot
956 * @slot: ACPI PHP slot
958 int acpiphp_enable_slot(struct acpiphp_slot *slot)
960 pci_lock_rescan_remove();
962 if (slot->flags & SLOT_IS_GOING_AWAY) {
963 pci_unlock_rescan_remove();
967 /* configure all functions */
968 if (!(slot->flags & SLOT_ENABLED))
971 pci_unlock_rescan_remove();
976 * acpiphp_disable_and_eject_slot - power off and eject slot
977 * @slot: ACPI PHP slot
979 static int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot)
981 struct acpiphp_func *func;
983 if (slot->flags & SLOT_IS_GOING_AWAY)
986 /* unconfigure all functions */
989 list_for_each_entry(func, &slot->funcs, sibling)
990 if (func->flags & FUNC_HAS_EJ0) {
991 acpi_handle handle = func_to_handle(func);
993 if (ACPI_FAILURE(acpi_evaluate_ej0(handle)))
994 acpi_handle_err(handle, "_EJ0 failed\n");
1002 int acpiphp_disable_slot(struct acpiphp_slot *slot)
1007 * Acquire acpi_scan_lock to ensure that the execution of _EJ0 in
1008 * acpiphp_disable_and_eject_slot() will be synchronized properly.
1010 acpi_scan_lock_acquire();
1011 pci_lock_rescan_remove();
1012 ret = acpiphp_disable_and_eject_slot(slot);
1013 pci_unlock_rescan_remove();
1014 acpi_scan_lock_release();
1022 u8 acpiphp_get_power_status(struct acpiphp_slot *slot)
1024 return (slot->flags & SLOT_ENABLED);
1031 u8 acpiphp_get_latch_status(struct acpiphp_slot *slot)
1033 return !(get_slot_status(slot) & ACPI_STA_DEVICE_UI);
1037 * adapter presence : 1
1040 u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot)
1042 return !!get_slot_status(slot);