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 acpiphp_set_hpp_values(struct pci_bus *bus);
65 static void hotplug_event(u32 type, struct acpiphp_context *context);
66 static void free_bridge(struct kref *kref);
69 * acpiphp_init_context - Create hotplug context and grab a reference to it.
70 * @adev: ACPI device object to create the context for.
72 * Call under acpi_hp_context_lock.
74 static struct acpiphp_context *acpiphp_init_context(struct acpi_device *adev)
76 struct acpiphp_context *context;
78 context = kzalloc(sizeof(*context), GFP_KERNEL);
82 context->refcount = 1;
83 acpi_set_hp_context(adev, &context->hp, acpiphp_hotplug_notify, NULL,
84 acpiphp_post_dock_fixup);
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 "
355 "hotplug driver\n", sun);
357 pr_warn("acpiphp_register_hotplug_slot failed "
358 "(err code = 0x%x)\n", retval);
360 /* Even if the slot registration fails, we can still use it. */
364 newfunc->slot = slot;
365 list_add_tail(&newfunc->sibling, &slot->funcs);
367 if (pci_bus_read_dev_vendor_id(pbus, PCI_DEVFN(device, function),
369 slot->flags |= SLOT_ENABLED;
374 static struct acpiphp_bridge *acpiphp_dev_to_bridge(struct acpi_device *adev)
376 struct acpiphp_context *context;
377 struct acpiphp_bridge *bridge = NULL;
379 acpi_lock_hp_context();
380 context = acpiphp_get_context(adev);
382 bridge = context->bridge;
386 acpiphp_put_context(context);
388 acpi_unlock_hp_context();
392 static void cleanup_bridge(struct acpiphp_bridge *bridge)
394 struct acpiphp_slot *slot;
395 struct acpiphp_func *func;
397 list_for_each_entry(slot, &bridge->slots, node) {
398 list_for_each_entry(func, &slot->funcs, sibling) {
399 struct acpi_device *adev = func_to_acpi_device(func);
401 acpi_lock_hp_context();
402 adev->hp->notify = NULL;
403 adev->hp->fixup = NULL;
404 acpi_unlock_hp_context();
406 slot->flags |= SLOT_IS_GOING_AWAY;
408 acpiphp_unregister_hotplug_slot(slot);
411 mutex_lock(&bridge_mutex);
412 list_del(&bridge->list);
413 mutex_unlock(&bridge_mutex);
415 acpi_lock_hp_context();
416 bridge->is_going_away = true;
417 acpi_unlock_hp_context();
421 * acpiphp_max_busnr - return the highest reserved bus number under the given bus.
422 * @bus: bus to start search with
424 static unsigned char acpiphp_max_busnr(struct pci_bus *bus)
427 unsigned char max, n;
430 * pci_bus_max_busnr will return the highest
431 * reserved busnr for all these children.
432 * that is equivalent to the bus->subordinate
433 * value. We don't want to use the parent's
434 * bus->subordinate value because it could have
437 max = bus->busn_res.start;
439 list_for_each_entry(tmp, &bus->children, node) {
440 n = pci_bus_max_busnr(tmp);
447 static void acpiphp_set_acpi_region(struct acpiphp_slot *slot)
449 struct acpiphp_func *func;
450 union acpi_object params[2];
451 struct acpi_object_list arg_list;
453 list_for_each_entry(func, &slot->funcs, sibling) {
455 arg_list.pointer = params;
456 params[0].type = ACPI_TYPE_INTEGER;
457 params[0].integer.value = ACPI_ADR_SPACE_PCI_CONFIG;
458 params[1].type = ACPI_TYPE_INTEGER;
459 params[1].integer.value = 1;
460 /* _REG is optional, we don't care about if there is failure */
461 acpi_evaluate_object(func_to_handle(func), "_REG", &arg_list,
466 static void check_hotplug_bridge(struct acpiphp_slot *slot, struct pci_dev *dev)
468 struct acpiphp_func *func;
470 /* quirk, or pcie could set it already */
471 if (dev->is_hotplug_bridge)
474 list_for_each_entry(func, &slot->funcs, sibling) {
475 if (PCI_FUNC(dev->devfn) == func->function) {
476 dev->is_hotplug_bridge = 1;
482 static int acpiphp_rescan_slot(struct acpiphp_slot *slot)
484 struct acpiphp_func *func;
486 list_for_each_entry(func, &slot->funcs, sibling) {
487 struct acpi_device *adev = func_to_acpi_device(func);
489 acpi_bus_scan(adev->handle);
490 if (acpi_device_enumerated(adev))
491 acpi_device_set_power(adev, ACPI_STATE_D0);
493 return pci_scan_slot(slot->bus, PCI_DEVFN(slot->device, 0));
497 * enable_slot - enable, configure a slot
498 * @slot: slot to be enabled
500 * This function should be called per *physical slot*,
501 * not per each slot object in ACPI namespace.
503 static void enable_slot(struct acpiphp_slot *slot)
506 struct pci_bus *bus = slot->bus;
507 struct acpiphp_func *func;
511 acpiphp_rescan_slot(slot);
512 max = acpiphp_max_busnr(bus);
513 for (pass = 0; pass < 2; pass++) {
514 list_for_each_entry(dev, &bus->devices, bus_list) {
515 if (PCI_SLOT(dev->devfn) != slot->device)
518 if (pci_is_bridge(dev)) {
519 max = pci_scan_bridge(bus, dev, max, pass);
520 if (pass && dev->subordinate) {
521 check_hotplug_bridge(slot, dev);
522 pcibios_resource_survey_bus(dev->subordinate);
523 __pci_bus_size_bridges(dev->subordinate,
529 __pci_bus_assign_resources(bus, &add_list, NULL);
531 acpiphp_sanitize_bus(bus);
532 acpiphp_set_hpp_values(bus);
533 acpiphp_set_acpi_region(slot);
535 list_for_each_entry(dev, &bus->devices, bus_list) {
536 /* Assume that newly added devices are powered on already. */
538 dev->current_state = PCI_D0;
541 pci_bus_add_devices(bus);
543 slot->flags |= SLOT_ENABLED;
544 list_for_each_entry(func, &slot->funcs, sibling) {
545 dev = pci_get_slot(bus, PCI_DEVFN(slot->device,
548 /* Do not set SLOT_ENABLED flag if some funcs
550 slot->flags &= (~SLOT_ENABLED);
557 * disable_slot - disable a slot
558 * @slot: ACPI PHP slot
560 static void disable_slot(struct acpiphp_slot *slot)
562 struct pci_bus *bus = slot->bus;
563 struct pci_dev *dev, *prev;
564 struct acpiphp_func *func;
567 * enable_slot() enumerates all functions in this device via
568 * pci_scan_slot(), whether they have associated ACPI hotplug
569 * methods (_EJ0, etc.) or not. Therefore, we remove all functions
572 list_for_each_entry_safe_reverse(dev, prev, &bus->devices, bus_list)
573 if (PCI_SLOT(dev->devfn) == slot->device)
574 pci_stop_and_remove_bus_device(dev);
576 list_for_each_entry(func, &slot->funcs, sibling)
577 acpi_bus_trim(func_to_acpi_device(func));
579 slot->flags &= (~SLOT_ENABLED);
582 static bool acpiphp_no_hotplug(struct acpi_device *adev)
584 return adev && adev->flags.no_hotplug;
587 static bool slot_no_hotplug(struct acpiphp_slot *slot)
589 struct acpiphp_func *func;
591 list_for_each_entry(func, &slot->funcs, sibling)
592 if (acpiphp_no_hotplug(func_to_acpi_device(func)))
599 * get_slot_status - get ACPI slot status
600 * @slot: ACPI PHP slot
602 * If a slot has _STA for each function and if any one of them
603 * returned non-zero status, return it.
605 * If a slot doesn't have _STA and if any one of its functions'
606 * configuration space is configured, return 0x0f as a _STA.
608 * Otherwise return 0.
610 static unsigned int get_slot_status(struct acpiphp_slot *slot)
612 unsigned long long sta = 0;
613 struct acpiphp_func *func;
615 list_for_each_entry(func, &slot->funcs, sibling) {
616 if (func->flags & FUNC_HAS_STA) {
619 status = acpi_evaluate_integer(func_to_handle(func),
621 if (ACPI_SUCCESS(status) && sta)
626 pci_bus_read_config_dword(slot->bus,
627 PCI_DEVFN(slot->device,
629 PCI_VENDOR_ID, &dvid);
630 if (dvid != 0xffffffff) {
637 return (unsigned int)sta;
640 static inline bool device_status_valid(unsigned int sta)
643 * ACPI spec says that _STA may return bit 0 clear with bit 3 set
644 * if the device is valid but does not require a device driver to be
645 * loaded (Section 6.3.7 of ACPI 5.0A).
647 unsigned int mask = ACPI_STA_DEVICE_ENABLED | ACPI_STA_DEVICE_FUNCTIONING;
648 return (sta & mask) == mask;
652 * trim_stale_devices - remove PCI devices that are not responding.
653 * @dev: PCI device to start walking the hierarchy from.
655 static void trim_stale_devices(struct pci_dev *dev)
657 struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
658 struct pci_bus *bus = dev->subordinate;
663 unsigned long long sta;
665 status = acpi_evaluate_integer(adev->handle, "_STA", NULL, &sta);
666 alive = (ACPI_SUCCESS(status) && device_status_valid(sta))
667 || acpiphp_no_hotplug(adev);
670 alive = pci_device_is_present(dev);
673 pci_stop_and_remove_bus_device(dev);
677 struct pci_dev *child, *tmp;
679 /* The device is a bridge. so check the bus below it. */
680 pm_runtime_get_sync(&dev->dev);
681 list_for_each_entry_safe_reverse(child, tmp, &bus->devices, bus_list)
682 trim_stale_devices(child);
684 pm_runtime_put(&dev->dev);
689 * acpiphp_check_bridge - re-enumerate devices
690 * @bridge: where to begin re-enumeration
692 * Iterate over all slots under this bridge and make sure that if a
693 * card is present they are enabled, and if not they are disabled.
695 static void acpiphp_check_bridge(struct acpiphp_bridge *bridge)
697 struct acpiphp_slot *slot;
699 /* Bail out if the bridge is going away. */
700 if (bridge->is_going_away)
703 list_for_each_entry(slot, &bridge->slots, node) {
704 struct pci_bus *bus = slot->bus;
705 struct pci_dev *dev, *tmp;
707 if (slot_no_hotplug(slot)) {
709 } else if (device_status_valid(get_slot_status(slot))) {
710 /* remove stale devices if any */
711 list_for_each_entry_safe_reverse(dev, tmp,
712 &bus->devices, bus_list)
713 if (PCI_SLOT(dev->devfn) == slot->device)
714 trim_stale_devices(dev);
716 /* configure all functions */
724 static void acpiphp_set_hpp_values(struct pci_bus *bus)
728 list_for_each_entry(dev, &bus->devices, bus_list)
729 pci_configure_slot(dev);
733 * Remove devices for which we could not assign resources, call
734 * arch specific code to fix-up the bus
736 static void acpiphp_sanitize_bus(struct pci_bus *bus)
738 struct pci_dev *dev, *tmp;
740 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM;
742 list_for_each_entry_safe_reverse(dev, tmp, &bus->devices, bus_list) {
743 for (i=0; i<PCI_BRIDGE_RESOURCES; i++) {
744 struct resource *res = &dev->resource[i];
745 if ((res->flags & type_mask) && !res->start &&
747 /* Could not assign a required resources
748 * for this device, remove it */
749 pci_stop_and_remove_bus_device(dev);
757 * ACPI event handlers
760 void acpiphp_check_host_bridge(struct acpi_device *adev)
762 struct acpiphp_bridge *bridge;
764 bridge = acpiphp_dev_to_bridge(adev);
766 pci_lock_rescan_remove();
768 acpiphp_check_bridge(bridge);
770 pci_unlock_rescan_remove();
775 static int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot);
777 static void hotplug_event(u32 type, struct acpiphp_context *context)
779 acpi_handle handle = context->hp.self->handle;
780 struct acpiphp_func *func = &context->func;
781 struct acpiphp_slot *slot = func->slot;
782 struct acpiphp_bridge *bridge;
784 acpi_lock_hp_context();
785 bridge = context->bridge;
789 acpi_unlock_hp_context();
791 pci_lock_rescan_remove();
794 case ACPI_NOTIFY_BUS_CHECK:
795 /* bus re-enumerate */
796 acpi_handle_debug(handle, "Bus check in %s()\n", __func__);
798 acpiphp_check_bridge(bridge);
799 else if (!(slot->flags & SLOT_IS_GOING_AWAY))
804 case ACPI_NOTIFY_DEVICE_CHECK:
806 acpi_handle_debug(handle, "Device check in %s()\n", __func__);
808 acpiphp_check_bridge(bridge);
809 } else if (!(slot->flags & SLOT_IS_GOING_AWAY)) {
811 * Check if anything has changed in the slot and rescan
812 * from the parent if that's the case.
814 if (acpiphp_rescan_slot(slot))
815 acpiphp_check_bridge(func->parent);
819 case ACPI_NOTIFY_EJECT_REQUEST:
820 /* request device eject */
821 acpi_handle_debug(handle, "Eject request in %s()\n", __func__);
822 acpiphp_disable_and_eject_slot(slot);
826 pci_unlock_rescan_remove();
831 static int acpiphp_hotplug_notify(struct acpi_device *adev, u32 type)
833 struct acpiphp_context *context;
835 context = acpiphp_grab_context(adev);
839 hotplug_event(type, context);
840 acpiphp_let_context_go(context);
845 * acpiphp_enumerate_slots - Enumerate PCI slots for a given bus.
846 * @bus: PCI bus to enumerate the slots for.
848 * A "slot" is an object associated with a PCI device number. All functions
849 * (PCI devices) with the same bus and device number belong to the same slot.
851 void acpiphp_enumerate_slots(struct pci_bus *bus)
853 struct acpiphp_bridge *bridge;
854 struct acpi_device *adev;
858 if (acpiphp_disabled)
861 adev = ACPI_COMPANION(bus->bridge);
865 handle = adev->handle;
866 bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
868 acpi_handle_err(handle, "No memory for bridge object\n");
872 INIT_LIST_HEAD(&bridge->slots);
873 kref_init(&bridge->ref);
874 bridge->pci_dev = pci_dev_get(bus->self);
875 bridge->pci_bus = bus;
878 * Grab a ref to the subordinate PCI bus in case the bus is
879 * removed via PCI core logical hotplug. The ref pins the bus
880 * (which we access during module unload).
882 get_device(&bus->dev);
884 if (!pci_is_root_bus(bridge->pci_bus)) {
885 struct acpiphp_context *context;
888 * This bridge should have been registered as a hotplug function
889 * under its parent, so the context should be there, unless the
890 * parent is going to be handled by pciehp, in which case this
891 * bridge is not interesting to us either.
893 acpi_lock_hp_context();
894 context = acpiphp_get_context(adev);
896 acpi_unlock_hp_context();
897 put_device(&bus->dev);
898 pci_dev_put(bridge->pci_dev);
902 bridge->context = context;
903 context->bridge = bridge;
904 /* Get a reference to the parent bridge. */
905 get_bridge(context->func.parent);
906 acpi_unlock_hp_context();
909 /* Must be added to the list prior to calling acpiphp_add_context(). */
910 mutex_lock(&bridge_mutex);
911 list_add(&bridge->list, &bridge_list);
912 mutex_unlock(&bridge_mutex);
914 /* register all slot objects under this bridge */
915 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1,
916 acpiphp_add_context, NULL, bridge, NULL);
917 if (ACPI_FAILURE(status)) {
918 acpi_handle_err(handle, "failed to register slots\n");
919 cleanup_bridge(bridge);
925 * acpiphp_remove_slots - Remove slot objects associated with a given bus.
926 * @bus: PCI bus to remove the slot objects for.
928 void acpiphp_remove_slots(struct pci_bus *bus)
930 struct acpiphp_bridge *bridge;
932 if (acpiphp_disabled)
935 mutex_lock(&bridge_mutex);
936 list_for_each_entry(bridge, &bridge_list, list)
937 if (bridge->pci_bus == bus) {
938 mutex_unlock(&bridge_mutex);
939 cleanup_bridge(bridge);
944 mutex_unlock(&bridge_mutex);
948 * acpiphp_enable_slot - power on slot
949 * @slot: ACPI PHP slot
951 int acpiphp_enable_slot(struct acpiphp_slot *slot)
953 pci_lock_rescan_remove();
955 if (slot->flags & SLOT_IS_GOING_AWAY)
958 /* configure all functions */
959 if (!(slot->flags & SLOT_ENABLED))
962 pci_unlock_rescan_remove();
967 * acpiphp_disable_and_eject_slot - power off and eject slot
968 * @slot: ACPI PHP slot
970 static int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot)
972 struct acpiphp_func *func;
974 if (slot->flags & SLOT_IS_GOING_AWAY)
977 /* unconfigure all functions */
980 list_for_each_entry(func, &slot->funcs, sibling)
981 if (func->flags & FUNC_HAS_EJ0) {
982 acpi_handle handle = func_to_handle(func);
984 if (ACPI_FAILURE(acpi_evaluate_ej0(handle)))
985 acpi_handle_err(handle, "_EJ0 failed\n");
993 int acpiphp_disable_slot(struct acpiphp_slot *slot)
998 * Acquire acpi_scan_lock to ensure that the execution of _EJ0 in
999 * acpiphp_disable_and_eject_slot() will be synchronized properly.
1001 acpi_scan_lock_acquire();
1002 pci_lock_rescan_remove();
1003 ret = acpiphp_disable_and_eject_slot(slot);
1004 pci_unlock_rescan_remove();
1005 acpi_scan_lock_release();
1013 u8 acpiphp_get_power_status(struct acpiphp_slot *slot)
1015 return (slot->flags & SLOT_ENABLED);
1022 u8 acpiphp_get_latch_status(struct acpiphp_slot *slot)
1024 return !(get_slot_status(slot) & ACPI_STA_DEVICE_UI);
1028 * adapter presence : 1
1031 u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot)
1033 return !!get_slot_status(slot);