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);
233 /* Check whether the PCI device is managed by native PCIe hotplug driver */
234 static bool device_is_managed_by_native_pciehp(struct pci_dev *pdev)
238 struct acpi_pci_root *root;
240 /* Check whether the PCIe port supports native PCIe hotplug */
241 if (pcie_capability_read_dword(pdev, PCI_EXP_SLTCAP, ®32))
243 if (!(reg32 & PCI_EXP_SLTCAP_HPC))
247 * Check whether native PCIe hotplug has been enabled for
248 * this PCIe hierarchy.
250 tmp = acpi_find_root_bridge_handle(pdev);
253 root = acpi_pci_find_root(tmp);
256 if (!(root->osc_control_set & OSC_PCI_EXPRESS_NATIVE_HP_CONTROL))
263 * acpiphp_add_context - Add ACPIPHP context to an ACPI device object.
264 * @handle: ACPI handle of the object to add a context to.
266 * @data: The object's parent ACPIPHP bridge.
269 static acpi_status acpiphp_add_context(acpi_handle handle, u32 lvl, void *data,
272 struct acpiphp_bridge *bridge = data;
273 struct acpiphp_context *context;
274 struct acpi_device *adev;
275 struct acpiphp_slot *slot;
276 struct acpiphp_func *newfunc;
277 acpi_status status = AE_OK;
278 unsigned long long adr;
279 int device, function;
280 struct pci_bus *pbus = bridge->pci_bus;
281 struct pci_dev *pdev = bridge->pci_dev;
284 status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr);
285 if (ACPI_FAILURE(status)) {
286 if (status != AE_NOT_FOUND)
287 acpi_handle_warn(handle,
288 "can't evaluate _ADR (%#x)\n", status);
291 if (acpi_bus_get_device(handle, &adev))
294 device = (adr >> 16) & 0xffff;
295 function = adr & 0xffff;
297 acpi_lock_hp_context();
298 context = acpiphp_init_context(adev);
300 acpi_unlock_hp_context();
301 acpi_handle_err(handle, "No hotplug context\n");
304 newfunc = &context->func;
305 newfunc->function = function;
306 newfunc->parent = bridge;
307 acpi_unlock_hp_context();
310 * If this is a dock device, its _EJ0 should be executed by the dock
311 * notify handler after calling _DCK.
313 if (!is_dock_device(adev) && acpi_has_method(handle, "_EJ0"))
314 newfunc->flags = FUNC_HAS_EJ0;
316 if (acpi_has_method(handle, "_STA"))
317 newfunc->flags |= FUNC_HAS_STA;
319 /* search for objects that share the same slot */
320 list_for_each_entry(slot, &bridge->slots, node)
321 if (slot->device == device)
324 slot = kzalloc(sizeof(struct acpiphp_slot), GFP_KERNEL);
326 acpi_lock_hp_context();
327 acpiphp_put_context(context);
328 acpi_unlock_hp_context();
332 slot->bus = bridge->pci_bus;
333 slot->device = device;
334 INIT_LIST_HEAD(&slot->funcs);
336 list_add_tail(&slot->node, &bridge->slots);
339 * Expose slots to user space for functions that have _EJ0 or _RMV or
340 * are located in dock stations. Do not expose them for devices handled
341 * by the native PCIe hotplug (PCIeHP), becuase that code is supposed to
342 * expose slots to user space in those cases.
344 if ((acpi_pci_check_ejectable(pbus, handle) || is_dock_device(adev))
345 && !(pdev && device_is_managed_by_native_pciehp(pdev))) {
346 unsigned long long sun;
350 status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun);
351 if (ACPI_FAILURE(status))
352 sun = bridge->nr_slots;
354 pr_debug("found ACPI PCI Hotplug slot %llu at PCI %04x:%02x:%02x\n",
355 sun, pci_domain_nr(pbus), pbus->number, device);
357 retval = acpiphp_register_hotplug_slot(slot, sun);
361 if (retval == -EBUSY)
362 pr_warn("Slot %llu already registered by another hotplug driver\n", sun);
364 pr_warn("acpiphp_register_hotplug_slot failed (err code = 0x%x)\n", retval);
366 /* Even if the slot registration fails, we can still use it. */
370 newfunc->slot = slot;
371 list_add_tail(&newfunc->sibling, &slot->funcs);
373 if (pci_bus_read_dev_vendor_id(pbus, PCI_DEVFN(device, function),
375 slot->flags |= SLOT_ENABLED;
380 static void cleanup_bridge(struct acpiphp_bridge *bridge)
382 struct acpiphp_slot *slot;
383 struct acpiphp_func *func;
385 list_for_each_entry(slot, &bridge->slots, node) {
386 list_for_each_entry(func, &slot->funcs, sibling) {
387 struct acpi_device *adev = func_to_acpi_device(func);
389 acpi_lock_hp_context();
390 adev->hp->notify = NULL;
391 adev->hp->fixup = NULL;
392 acpi_unlock_hp_context();
394 slot->flags |= SLOT_IS_GOING_AWAY;
396 acpiphp_unregister_hotplug_slot(slot);
399 mutex_lock(&bridge_mutex);
400 list_del(&bridge->list);
401 mutex_unlock(&bridge_mutex);
403 acpi_lock_hp_context();
404 bridge->is_going_away = true;
405 acpi_unlock_hp_context();
409 * acpiphp_max_busnr - return the highest reserved bus number under the given bus.
410 * @bus: bus to start search with
412 static unsigned char acpiphp_max_busnr(struct pci_bus *bus)
415 unsigned char max, n;
418 * pci_bus_max_busnr will return the highest
419 * reserved busnr for all these children.
420 * that is equivalent to the bus->subordinate
421 * value. We don't want to use the parent's
422 * bus->subordinate value because it could have
425 max = bus->busn_res.start;
427 list_for_each_entry(tmp, &bus->children, node) {
428 n = pci_bus_max_busnr(tmp);
435 static void acpiphp_set_acpi_region(struct acpiphp_slot *slot)
437 struct acpiphp_func *func;
438 union acpi_object params[2];
439 struct acpi_object_list arg_list;
441 list_for_each_entry(func, &slot->funcs, sibling) {
443 arg_list.pointer = params;
444 params[0].type = ACPI_TYPE_INTEGER;
445 params[0].integer.value = ACPI_ADR_SPACE_PCI_CONFIG;
446 params[1].type = ACPI_TYPE_INTEGER;
447 params[1].integer.value = 1;
448 /* _REG is optional, we don't care about if there is failure */
449 acpi_evaluate_object(func_to_handle(func), "_REG", &arg_list,
454 static void check_hotplug_bridge(struct acpiphp_slot *slot, struct pci_dev *dev)
456 struct acpiphp_func *func;
458 /* quirk, or pcie could set it already */
459 if (dev->is_hotplug_bridge)
462 list_for_each_entry(func, &slot->funcs, sibling) {
463 if (PCI_FUNC(dev->devfn) == func->function) {
464 dev->is_hotplug_bridge = 1;
470 static int acpiphp_rescan_slot(struct acpiphp_slot *slot)
472 struct acpiphp_func *func;
474 list_for_each_entry(func, &slot->funcs, sibling) {
475 struct acpi_device *adev = func_to_acpi_device(func);
477 acpi_bus_scan(adev->handle);
478 if (acpi_device_enumerated(adev))
479 acpi_device_set_power(adev, ACPI_STATE_D0);
481 return pci_scan_slot(slot->bus, PCI_DEVFN(slot->device, 0));
485 * enable_slot - enable, configure a slot
486 * @slot: slot to be enabled
488 * This function should be called per *physical slot*,
489 * not per each slot object in ACPI namespace.
491 static void enable_slot(struct acpiphp_slot *slot)
494 struct pci_bus *bus = slot->bus;
495 struct acpiphp_func *func;
499 acpiphp_rescan_slot(slot);
500 max = acpiphp_max_busnr(bus);
501 for (pass = 0; pass < 2; pass++) {
502 list_for_each_entry(dev, &bus->devices, bus_list) {
503 if (PCI_SLOT(dev->devfn) != slot->device)
506 if (pci_is_bridge(dev)) {
507 max = pci_scan_bridge(bus, dev, max, pass);
508 if (pass && dev->subordinate) {
509 check_hotplug_bridge(slot, dev);
510 pcibios_resource_survey_bus(dev->subordinate);
511 __pci_bus_size_bridges(dev->subordinate,
517 __pci_bus_assign_resources(bus, &add_list, NULL);
519 acpiphp_sanitize_bus(bus);
520 pcie_bus_configure_settings(bus);
521 acpiphp_set_acpi_region(slot);
523 list_for_each_entry(dev, &bus->devices, bus_list) {
524 /* Assume that newly added devices are powered on already. */
526 dev->current_state = PCI_D0;
529 pci_bus_add_devices(bus);
531 slot->flags |= SLOT_ENABLED;
532 list_for_each_entry(func, &slot->funcs, sibling) {
533 dev = pci_get_slot(bus, PCI_DEVFN(slot->device,
536 /* Do not set SLOT_ENABLED flag if some funcs
538 slot->flags &= (~SLOT_ENABLED);
546 * disable_slot - disable a slot
547 * @slot: ACPI PHP slot
549 static void disable_slot(struct acpiphp_slot *slot)
551 struct pci_bus *bus = slot->bus;
552 struct pci_dev *dev, *prev;
553 struct acpiphp_func *func;
556 * enable_slot() enumerates all functions in this device via
557 * pci_scan_slot(), whether they have associated ACPI hotplug
558 * methods (_EJ0, etc.) or not. Therefore, we remove all functions
561 list_for_each_entry_safe_reverse(dev, prev, &bus->devices, bus_list)
562 if (PCI_SLOT(dev->devfn) == slot->device)
563 pci_stop_and_remove_bus_device(dev);
565 list_for_each_entry(func, &slot->funcs, sibling)
566 acpi_bus_trim(func_to_acpi_device(func));
568 slot->flags &= (~SLOT_ENABLED);
571 static bool slot_no_hotplug(struct acpiphp_slot *slot)
573 struct pci_bus *bus = slot->bus;
576 list_for_each_entry(dev, &bus->devices, bus_list) {
577 if (PCI_SLOT(dev->devfn) == slot->device && dev->ignore_hotplug)
584 * get_slot_status - get ACPI slot status
585 * @slot: ACPI PHP slot
587 * If a slot has _STA for each function and if any one of them
588 * returned non-zero status, return it.
590 * If a slot doesn't have _STA and if any one of its functions'
591 * configuration space is configured, return 0x0f as a _STA.
593 * Otherwise return 0.
595 static unsigned int get_slot_status(struct acpiphp_slot *slot)
597 unsigned long long sta = 0;
598 struct acpiphp_func *func;
601 list_for_each_entry(func, &slot->funcs, sibling) {
602 if (func->flags & FUNC_HAS_STA) {
605 status = acpi_evaluate_integer(func_to_handle(func),
607 if (ACPI_SUCCESS(status) && sta)
610 if (pci_bus_read_dev_vendor_id(slot->bus,
611 PCI_DEVFN(slot->device, func->function),
621 * Check for the slot itself since it may be that the
622 * ACPI slot is a device below PCIe upstream port so in
623 * that case it may not even be reachable yet.
625 if (pci_bus_read_dev_vendor_id(slot->bus,
626 PCI_DEVFN(slot->device, 0), &dvid, 0)) {
631 return (unsigned int)sta;
634 static inline bool device_status_valid(unsigned int sta)
637 * ACPI spec says that _STA may return bit 0 clear with bit 3 set
638 * if the device is valid but does not require a device driver to be
639 * loaded (Section 6.3.7 of ACPI 5.0A).
641 unsigned int mask = ACPI_STA_DEVICE_ENABLED | ACPI_STA_DEVICE_FUNCTIONING;
642 return (sta & mask) == mask;
646 * trim_stale_devices - remove PCI devices that are not responding.
647 * @dev: PCI device to start walking the hierarchy from.
649 static void trim_stale_devices(struct pci_dev *dev)
651 struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
652 struct pci_bus *bus = dev->subordinate;
653 bool alive = dev->ignore_hotplug;
657 unsigned long long sta;
659 status = acpi_evaluate_integer(adev->handle, "_STA", NULL, &sta);
660 alive = alive || (ACPI_SUCCESS(status) && device_status_valid(sta));
663 alive = pci_device_is_present(dev);
666 pci_stop_and_remove_bus_device(dev);
670 struct pci_dev *child, *tmp;
672 /* The device is a bridge. so check the bus below it. */
673 pm_runtime_get_sync(&dev->dev);
674 list_for_each_entry_safe_reverse(child, tmp, &bus->devices, bus_list)
675 trim_stale_devices(child);
677 pm_runtime_put(&dev->dev);
682 * acpiphp_check_bridge - re-enumerate devices
683 * @bridge: where to begin re-enumeration
685 * Iterate over all slots under this bridge and make sure that if a
686 * card is present they are enabled, and if not they are disabled.
688 static void acpiphp_check_bridge(struct acpiphp_bridge *bridge)
690 struct acpiphp_slot *slot;
692 /* Bail out if the bridge is going away. */
693 if (bridge->is_going_away)
697 pm_runtime_get_sync(&bridge->pci_dev->dev);
699 list_for_each_entry(slot, &bridge->slots, node) {
700 struct pci_bus *bus = slot->bus;
701 struct pci_dev *dev, *tmp;
703 if (slot_no_hotplug(slot)) {
705 } else if (device_status_valid(get_slot_status(slot))) {
706 /* remove stale devices if any */
707 list_for_each_entry_safe_reverse(dev, tmp,
708 &bus->devices, bus_list)
709 if (PCI_SLOT(dev->devfn) == slot->device)
710 trim_stale_devices(dev);
712 /* configure all functions */
720 pm_runtime_put(&bridge->pci_dev->dev);
724 * Remove devices for which we could not assign resources, call
725 * arch specific code to fix-up the bus
727 static void acpiphp_sanitize_bus(struct pci_bus *bus)
729 struct pci_dev *dev, *tmp;
731 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM;
733 list_for_each_entry_safe_reverse(dev, tmp, &bus->devices, bus_list) {
734 for (i = 0; i < PCI_BRIDGE_RESOURCES; i++) {
735 struct resource *res = &dev->resource[i];
736 if ((res->flags & type_mask) && !res->start &&
738 /* Could not assign a required resources
739 * for this device, remove it */
740 pci_stop_and_remove_bus_device(dev);
748 * ACPI event handlers
751 void acpiphp_check_host_bridge(struct acpi_device *adev)
753 struct acpiphp_bridge *bridge = NULL;
755 acpi_lock_hp_context();
757 bridge = to_acpiphp_root_context(adev->hp)->root_bridge;
761 acpi_unlock_hp_context();
763 pci_lock_rescan_remove();
765 acpiphp_check_bridge(bridge);
767 pci_unlock_rescan_remove();
772 static int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot);
774 static void hotplug_event(u32 type, struct acpiphp_context *context)
776 acpi_handle handle = context->hp.self->handle;
777 struct acpiphp_func *func = &context->func;
778 struct acpiphp_slot *slot = func->slot;
779 struct acpiphp_bridge *bridge;
781 acpi_lock_hp_context();
782 bridge = context->bridge;
786 acpi_unlock_hp_context();
788 pci_lock_rescan_remove();
791 case ACPI_NOTIFY_BUS_CHECK:
792 /* bus re-enumerate */
793 acpi_handle_debug(handle, "Bus check in %s()\n", __func__);
795 acpiphp_check_bridge(bridge);
796 else if (!(slot->flags & SLOT_IS_GOING_AWAY))
801 case ACPI_NOTIFY_DEVICE_CHECK:
803 acpi_handle_debug(handle, "Device check in %s()\n", __func__);
805 acpiphp_check_bridge(bridge);
806 } else if (!(slot->flags & SLOT_IS_GOING_AWAY)) {
808 * Check if anything has changed in the slot and rescan
809 * from the parent if that's the case.
811 if (acpiphp_rescan_slot(slot))
812 acpiphp_check_bridge(func->parent);
816 case ACPI_NOTIFY_EJECT_REQUEST:
817 /* request device eject */
818 acpi_handle_debug(handle, "Eject request in %s()\n", __func__);
819 acpiphp_disable_and_eject_slot(slot);
823 pci_unlock_rescan_remove();
828 static int acpiphp_hotplug_notify(struct acpi_device *adev, u32 type)
830 struct acpiphp_context *context;
832 context = acpiphp_grab_context(adev);
836 hotplug_event(type, context);
837 acpiphp_let_context_go(context);
842 * acpiphp_enumerate_slots - Enumerate PCI slots for a given bus.
843 * @bus: PCI bus to enumerate the slots for.
845 * A "slot" is an object associated with a PCI device number. All functions
846 * (PCI devices) with the same bus and device number belong to the same slot.
848 void acpiphp_enumerate_slots(struct pci_bus *bus)
850 struct acpiphp_bridge *bridge;
851 struct acpi_device *adev;
855 if (acpiphp_disabled)
858 adev = ACPI_COMPANION(bus->bridge);
862 handle = adev->handle;
863 bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
865 acpi_handle_err(handle, "No memory for bridge object\n");
869 INIT_LIST_HEAD(&bridge->slots);
870 kref_init(&bridge->ref);
871 bridge->pci_dev = pci_dev_get(bus->self);
872 bridge->pci_bus = bus;
875 * Grab a ref to the subordinate PCI bus in case the bus is
876 * removed via PCI core logical hotplug. The ref pins the bus
877 * (which we access during module unload).
879 get_device(&bus->dev);
881 acpi_lock_hp_context();
882 if (pci_is_root_bus(bridge->pci_bus)) {
883 struct acpiphp_root_context *root_context;
885 root_context = kzalloc(sizeof(*root_context), GFP_KERNEL);
889 root_context->root_bridge = bridge;
890 acpi_set_hp_context(adev, &root_context->hp);
892 struct acpiphp_context *context;
895 * This bridge should have been registered as a hotplug function
896 * under its parent, so the context should be there, unless the
897 * parent is going to be handled by pciehp, in which case this
898 * bridge is not interesting to us either.
900 context = acpiphp_get_context(adev);
904 bridge->context = context;
905 context->bridge = bridge;
906 /* Get a reference to the parent bridge. */
907 get_bridge(context->func.parent);
909 acpi_unlock_hp_context();
911 /* Must be added to the list prior to calling acpiphp_add_context(). */
912 mutex_lock(&bridge_mutex);
913 list_add(&bridge->list, &bridge_list);
914 mutex_unlock(&bridge_mutex);
916 /* register all slot objects under this bridge */
917 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1,
918 acpiphp_add_context, NULL, bridge, NULL);
919 if (ACPI_FAILURE(status)) {
920 acpi_handle_err(handle, "failed to register slots\n");
921 cleanup_bridge(bridge);
927 acpi_unlock_hp_context();
928 put_device(&bus->dev);
929 pci_dev_put(bridge->pci_dev);
933 static void acpiphp_drop_bridge(struct acpiphp_bridge *bridge)
935 if (pci_is_root_bus(bridge->pci_bus)) {
936 struct acpiphp_root_context *root_context;
937 struct acpi_device *adev;
939 acpi_lock_hp_context();
940 adev = ACPI_COMPANION(bridge->pci_bus->bridge);
941 root_context = to_acpiphp_root_context(adev->hp);
943 acpi_unlock_hp_context();
946 cleanup_bridge(bridge);
951 * acpiphp_remove_slots - Remove slot objects associated with a given bus.
952 * @bus: PCI bus to remove the slot objects for.
954 void acpiphp_remove_slots(struct pci_bus *bus)
956 struct acpiphp_bridge *bridge;
958 if (acpiphp_disabled)
961 mutex_lock(&bridge_mutex);
962 list_for_each_entry(bridge, &bridge_list, list)
963 if (bridge->pci_bus == bus) {
964 mutex_unlock(&bridge_mutex);
965 acpiphp_drop_bridge(bridge);
969 mutex_unlock(&bridge_mutex);
973 * acpiphp_enable_slot - power on slot
974 * @slot: ACPI PHP slot
976 int acpiphp_enable_slot(struct acpiphp_slot *slot)
978 pci_lock_rescan_remove();
980 if (slot->flags & SLOT_IS_GOING_AWAY) {
981 pci_unlock_rescan_remove();
985 /* configure all functions */
986 if (!(slot->flags & SLOT_ENABLED))
989 pci_unlock_rescan_remove();
994 * acpiphp_disable_and_eject_slot - power off and eject slot
995 * @slot: ACPI PHP slot
997 static int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot)
999 struct acpiphp_func *func;
1001 if (slot->flags & SLOT_IS_GOING_AWAY)
1004 /* unconfigure all functions */
1007 list_for_each_entry(func, &slot->funcs, sibling)
1008 if (func->flags & FUNC_HAS_EJ0) {
1009 acpi_handle handle = func_to_handle(func);
1011 if (ACPI_FAILURE(acpi_evaluate_ej0(handle)))
1012 acpi_handle_err(handle, "_EJ0 failed\n");
1020 int acpiphp_disable_slot(struct acpiphp_slot *slot)
1025 * Acquire acpi_scan_lock to ensure that the execution of _EJ0 in
1026 * acpiphp_disable_and_eject_slot() will be synchronized properly.
1028 acpi_scan_lock_acquire();
1029 pci_lock_rescan_remove();
1030 ret = acpiphp_disable_and_eject_slot(slot);
1031 pci_unlock_rescan_remove();
1032 acpi_scan_lock_release();
1040 u8 acpiphp_get_power_status(struct acpiphp_slot *slot)
1042 return (slot->flags & SLOT_ENABLED);
1049 u8 acpiphp_get_latch_status(struct acpiphp_slot *slot)
1051 return !(get_slot_status(slot) & ACPI_STA_DEVICE_UI);
1055 * adapter presence : 1
1058 u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot)
1060 return !!get_slot_status(slot);