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 #include <linux/init.h>
43 #include <linux/module.h>
45 #include <linux/kernel.h>
46 #include <linux/pci.h>
47 #include <linux/pci_hotplug.h>
48 #include <linux/pci-acpi.h>
49 #include <linux/pm_runtime.h>
50 #include <linux/mutex.h>
51 #include <linux/slab.h>
52 #include <linux/acpi.h>
57 static LIST_HEAD(bridge_list);
58 static DEFINE_MUTEX(bridge_mutex);
59 static DEFINE_MUTEX(acpiphp_context_lock);
61 #define MY_NAME "acpiphp_glue"
63 static void handle_hotplug_event(acpi_handle handle, u32 type, void *data);
64 static void acpiphp_sanitize_bus(struct pci_bus *bus);
65 static void acpiphp_set_hpp_values(struct pci_bus *bus);
66 static void hotplug_event(acpi_handle handle, u32 type, void *data);
67 static void free_bridge(struct kref *kref);
69 static void acpiphp_context_handler(acpi_handle handle, void *context)
71 /* Intentionally empty. */
75 * acpiphp_init_context - Create hotplug context and grab a reference to it.
76 * @handle: ACPI object handle to create the context for.
78 * Call under acpiphp_context_lock.
80 static struct acpiphp_context *acpiphp_init_context(acpi_handle handle)
82 struct acpiphp_context *context;
85 context = kzalloc(sizeof(*context), GFP_KERNEL);
89 context->handle = handle;
90 context->refcount = 1;
91 status = acpi_attach_data(handle, acpiphp_context_handler, context);
92 if (ACPI_FAILURE(status)) {
100 * acpiphp_get_context - Get hotplug context and grab a reference to it.
101 * @handle: ACPI object handle to get the context for.
103 * Call under acpiphp_context_lock.
105 static struct acpiphp_context *acpiphp_get_context(acpi_handle handle)
107 struct acpiphp_context *context = NULL;
111 status = acpi_get_data(handle, acpiphp_context_handler, &data);
112 if (ACPI_SUCCESS(status)) {
120 * acpiphp_put_context - Drop a reference to ACPI hotplug context.
121 * @handle: ACPI object handle to put the context for.
123 * The context object is removed if there are no more references to it.
125 * Call under acpiphp_context_lock.
127 static void acpiphp_put_context(struct acpiphp_context *context)
129 if (--context->refcount)
132 WARN_ON(context->bridge);
133 acpi_detach_data(context->handle, acpiphp_context_handler);
137 static inline void get_bridge(struct acpiphp_bridge *bridge)
139 kref_get(&bridge->ref);
142 static inline void put_bridge(struct acpiphp_bridge *bridge)
144 kref_put(&bridge->ref, free_bridge);
147 static void free_bridge(struct kref *kref)
149 struct acpiphp_context *context;
150 struct acpiphp_bridge *bridge;
151 struct acpiphp_slot *slot, *next;
152 struct acpiphp_func *func, *tmp;
154 mutex_lock(&acpiphp_context_lock);
156 bridge = container_of(kref, struct acpiphp_bridge, ref);
158 list_for_each_entry_safe(slot, next, &bridge->slots, node) {
159 list_for_each_entry_safe(func, tmp, &slot->funcs, sibling)
160 acpiphp_put_context(func_to_context(func));
165 context = bridge->context;
166 /* Root bridges will not have hotplug context. */
168 /* Release the reference taken by acpiphp_enumerate_slots(). */
169 put_bridge(context->func.parent);
170 context->bridge = NULL;
171 acpiphp_put_context(context);
174 put_device(&bridge->pci_bus->dev);
175 pci_dev_put(bridge->pci_dev);
178 mutex_unlock(&acpiphp_context_lock);
182 * the _DCK method can do funny things... and sometimes not
185 * TBD - figure out a way to only call fixups for
186 * systems that require them.
188 static void post_dock_fixups(acpi_handle not_used, u32 event, void *data)
190 struct acpiphp_context *context = data;
191 struct pci_bus *bus = context->func.slot->bus;
197 /* fixup bad _DCK function that rewrites
198 * secondary bridge on slot
200 pci_read_config_dword(bus->self,
204 if (((buses >> 8) & 0xff) != bus->busn_res.start) {
205 buses = (buses & 0xff000000)
206 | ((unsigned int)(bus->primary) << 0)
207 | ((unsigned int)(bus->busn_res.start) << 8)
208 | ((unsigned int)(bus->busn_res.end) << 16);
209 pci_write_config_dword(bus->self, PCI_PRIMARY_BUS, buses);
214 static const struct acpi_dock_ops acpiphp_dock_ops = {
215 .fixup = post_dock_fixups,
216 .handler = hotplug_event,
219 /* Check whether the PCI device is managed by native PCIe hotplug driver */
220 static bool device_is_managed_by_native_pciehp(struct pci_dev *pdev)
224 struct acpi_pci_root *root;
226 /* Check whether the PCIe port supports native PCIe hotplug */
227 if (pcie_capability_read_dword(pdev, PCI_EXP_SLTCAP, ®32))
229 if (!(reg32 & PCI_EXP_SLTCAP_HPC))
233 * Check whether native PCIe hotplug has been enabled for
234 * this PCIe hierarchy.
236 tmp = acpi_find_root_bridge_handle(pdev);
239 root = acpi_pci_find_root(tmp);
242 if (!(root->osc_control_set & OSC_PCI_EXPRESS_NATIVE_HP_CONTROL))
248 static void acpiphp_dock_init(void *data)
250 struct acpiphp_context *context = data;
252 get_bridge(context->func.parent);
255 static void acpiphp_dock_release(void *data)
257 struct acpiphp_context *context = data;
259 put_bridge(context->func.parent);
262 /* callback routine to register each ACPI PCI slot object */
263 static acpi_status register_slot(acpi_handle handle, u32 lvl, void *data,
266 struct acpiphp_bridge *bridge = data;
267 struct acpiphp_context *context;
268 struct acpiphp_slot *slot;
269 struct acpiphp_func *newfunc;
270 acpi_status status = AE_OK;
271 unsigned long long adr;
272 int device, function;
273 struct pci_bus *pbus = bridge->pci_bus;
274 struct pci_dev *pdev = bridge->pci_dev;
277 if (pdev && device_is_managed_by_native_pciehp(pdev))
280 status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr);
281 if (ACPI_FAILURE(status)) {
282 acpi_handle_warn(handle, "can't evaluate _ADR (%#x)\n", status);
286 device = (adr >> 16) & 0xffff;
287 function = adr & 0xffff;
289 mutex_lock(&acpiphp_context_lock);
290 context = acpiphp_init_context(handle);
292 mutex_unlock(&acpiphp_context_lock);
293 acpi_handle_err(handle, "No hotplug context\n");
296 newfunc = &context->func;
297 newfunc->function = function;
298 newfunc->parent = bridge;
299 mutex_unlock(&acpiphp_context_lock);
301 if (acpi_has_method(handle, "_EJ0"))
302 newfunc->flags = FUNC_HAS_EJ0;
304 if (acpi_has_method(handle, "_STA"))
305 newfunc->flags |= FUNC_HAS_STA;
307 if (acpi_has_method(handle, "_DCK"))
308 newfunc->flags |= FUNC_HAS_DCK;
310 /* search for objects that share the same slot */
311 list_for_each_entry(slot, &bridge->slots, node)
312 if (slot->device == device)
315 slot = kzalloc(sizeof(struct acpiphp_slot), GFP_KERNEL);
317 status = AE_NO_MEMORY;
321 slot->bus = bridge->pci_bus;
322 slot->device = device;
323 INIT_LIST_HEAD(&slot->funcs);
324 mutex_init(&slot->crit_sect);
326 list_add_tail(&slot->node, &bridge->slots);
328 /* Register slots for ejectable funtions only. */
329 if (acpi_pci_check_ejectable(pbus, handle) || is_dock_device(handle)) {
330 unsigned long long sun;
334 status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun);
335 if (ACPI_FAILURE(status))
336 sun = bridge->nr_slots;
338 dbg("found ACPI PCI Hotplug slot %llu at PCI %04x:%02x:%02x\n",
339 sun, pci_domain_nr(pbus), pbus->number, device);
341 retval = acpiphp_register_hotplug_slot(slot, sun);
345 if (retval == -EBUSY)
346 warn("Slot %llu already registered by another "
347 "hotplug driver\n", sun);
349 warn("acpiphp_register_hotplug_slot failed "
350 "(err code = 0x%x)\n", retval);
352 /* Even if the slot registration fails, we can still use it. */
356 newfunc->slot = slot;
357 list_add_tail(&newfunc->sibling, &slot->funcs);
359 if (pci_bus_read_dev_vendor_id(pbus, PCI_DEVFN(device, function),
361 slot->flags |= SLOT_ENABLED;
363 if (is_dock_device(handle)) {
364 /* we don't want to call this device's _EJ0
365 * because we want the dock notify handler
366 * to call it after it calls _DCK
368 newfunc->flags &= ~FUNC_HAS_EJ0;
369 if (register_hotplug_dock_device(handle,
370 &acpiphp_dock_ops, context,
371 acpiphp_dock_init, acpiphp_dock_release))
372 dbg("failed to register dock device\n");
375 /* install notify handler */
376 if (!(newfunc->flags & FUNC_HAS_DCK)) {
377 status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
378 handle_hotplug_event,
380 if (ACPI_FAILURE(status))
381 acpi_handle_err(handle,
382 "failed to install notify handler\n");
388 mutex_lock(&acpiphp_context_lock);
389 acpiphp_put_context(context);
390 mutex_unlock(&acpiphp_context_lock);
394 static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle)
396 struct acpiphp_context *context;
397 struct acpiphp_bridge *bridge = NULL;
399 mutex_lock(&acpiphp_context_lock);
400 context = acpiphp_get_context(handle);
402 bridge = context->bridge;
406 acpiphp_put_context(context);
408 mutex_unlock(&acpiphp_context_lock);
412 static void cleanup_bridge(struct acpiphp_bridge *bridge)
414 struct acpiphp_slot *slot;
415 struct acpiphp_func *func;
418 list_for_each_entry(slot, &bridge->slots, node) {
419 list_for_each_entry(func, &slot->funcs, sibling) {
420 acpi_handle handle = func_to_handle(func);
422 if (is_dock_device(handle))
423 unregister_hotplug_dock_device(handle);
425 if (!(func->flags & FUNC_HAS_DCK)) {
426 status = acpi_remove_notify_handler(handle,
428 handle_hotplug_event);
429 if (ACPI_FAILURE(status))
430 err("failed to remove notify handler\n");
434 acpiphp_unregister_hotplug_slot(slot);
437 mutex_lock(&bridge_mutex);
438 list_del(&bridge->list);
439 mutex_unlock(&bridge_mutex);
443 * acpiphp_max_busnr - return the highest reserved bus number under the given bus.
444 * @bus: bus to start search with
446 static unsigned char acpiphp_max_busnr(struct pci_bus *bus)
448 struct list_head *tmp;
449 unsigned char max, n;
452 * pci_bus_max_busnr will return the highest
453 * reserved busnr for all these children.
454 * that is equivalent to the bus->subordinate
455 * value. We don't want to use the parent's
456 * bus->subordinate value because it could have
459 max = bus->busn_res.start;
461 list_for_each(tmp, &bus->children) {
462 n = pci_bus_max_busnr(pci_bus_b(tmp));
470 * acpiphp_bus_trim - Trim device objects in an ACPI namespace subtree.
471 * @handle: ACPI device object handle to start from.
473 static void acpiphp_bus_trim(acpi_handle handle)
475 struct acpi_device *adev = NULL;
477 acpi_bus_get_device(handle, &adev);
483 * acpiphp_bus_add - Scan ACPI namespace subtree.
484 * @handle: ACPI object handle to start the scan from.
486 static void acpiphp_bus_add(acpi_handle handle)
488 struct acpi_device *adev = NULL;
490 acpiphp_bus_trim(handle);
491 acpi_bus_scan(handle);
492 acpi_bus_get_device(handle, &adev);
494 acpi_device_set_power(adev, ACPI_STATE_D0);
497 static void acpiphp_set_acpi_region(struct acpiphp_slot *slot)
499 struct acpiphp_func *func;
500 union acpi_object params[2];
501 struct acpi_object_list arg_list;
503 list_for_each_entry(func, &slot->funcs, sibling) {
505 arg_list.pointer = params;
506 params[0].type = ACPI_TYPE_INTEGER;
507 params[0].integer.value = ACPI_ADR_SPACE_PCI_CONFIG;
508 params[1].type = ACPI_TYPE_INTEGER;
509 params[1].integer.value = 1;
510 /* _REG is optional, we don't care about if there is failure */
511 acpi_evaluate_object(func_to_handle(func), "_REG", &arg_list,
516 static void check_hotplug_bridge(struct acpiphp_slot *slot, struct pci_dev *dev)
518 struct acpiphp_func *func;
520 /* quirk, or pcie could set it already */
521 if (dev->is_hotplug_bridge)
524 list_for_each_entry(func, &slot->funcs, sibling) {
525 if (PCI_FUNC(dev->devfn) == func->function) {
526 dev->is_hotplug_bridge = 1;
533 * enable_slot - enable, configure a slot
534 * @slot: slot to be enabled
536 * This function should be called per *physical slot*,
537 * not per each slot object in ACPI namespace.
539 static void __ref enable_slot(struct acpiphp_slot *slot)
542 struct pci_bus *bus = slot->bus;
543 struct acpiphp_func *func;
547 list_for_each_entry(func, &slot->funcs, sibling)
548 acpiphp_bus_add(func_to_handle(func));
550 pci_scan_slot(bus, PCI_DEVFN(slot->device, 0));
552 max = acpiphp_max_busnr(bus);
553 for (pass = 0; pass < 2; pass++) {
554 list_for_each_entry(dev, &bus->devices, bus_list) {
555 if (PCI_SLOT(dev->devfn) != slot->device)
558 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
559 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
560 max = pci_scan_bridge(bus, dev, max, pass);
561 if (pass && dev->subordinate) {
562 check_hotplug_bridge(slot, dev);
563 pcibios_resource_survey_bus(dev->subordinate);
564 __pci_bus_size_bridges(dev->subordinate,
571 __pci_bus_assign_resources(bus, &add_list, NULL);
572 acpiphp_sanitize_bus(bus);
573 acpiphp_set_hpp_values(bus);
574 acpiphp_set_acpi_region(slot);
576 list_for_each_entry(dev, &bus->devices, bus_list) {
577 /* Assume that newly added devices are powered on already. */
579 dev->current_state = PCI_D0;
582 pci_bus_add_devices(bus);
584 slot->flags |= SLOT_ENABLED;
585 list_for_each_entry(func, &slot->funcs, sibling) {
586 dev = pci_get_slot(bus, PCI_DEVFN(slot->device,
589 /* Do not set SLOT_ENABLED flag if some funcs
591 slot->flags &= (~SLOT_ENABLED);
597 /* return first device in slot, acquiring a reference on it */
598 static struct pci_dev *dev_in_slot(struct acpiphp_slot *slot)
600 struct pci_bus *bus = slot->bus;
602 struct pci_dev *ret = NULL;
604 down_read(&pci_bus_sem);
605 list_for_each_entry(dev, &bus->devices, bus_list)
606 if (PCI_SLOT(dev->devfn) == slot->device) {
607 ret = pci_dev_get(dev);
610 up_read(&pci_bus_sem);
616 * disable_slot - disable a slot
617 * @slot: ACPI PHP slot
619 static void disable_slot(struct acpiphp_slot *slot)
621 struct acpiphp_func *func;
622 struct pci_dev *pdev;
625 * enable_slot() enumerates all functions in this device via
626 * pci_scan_slot(), whether they have associated ACPI hotplug
627 * methods (_EJ0, etc.) or not. Therefore, we remove all functions
630 while ((pdev = dev_in_slot(slot))) {
631 pci_stop_and_remove_bus_device(pdev);
635 list_for_each_entry(func, &slot->funcs, sibling)
636 acpiphp_bus_trim(func_to_handle(func));
638 slot->flags &= (~SLOT_ENABLED);
643 * get_slot_status - get ACPI slot status
644 * @slot: ACPI PHP slot
646 * If a slot has _STA for each function and if any one of them
647 * returned non-zero status, return it.
649 * If a slot doesn't have _STA and if any one of its functions'
650 * configuration space is configured, return 0x0f as a _STA.
652 * Otherwise return 0.
654 static unsigned int get_slot_status(struct acpiphp_slot *slot)
656 unsigned long long sta = 0;
657 struct acpiphp_func *func;
659 list_for_each_entry(func, &slot->funcs, sibling) {
660 if (func->flags & FUNC_HAS_STA) {
663 status = acpi_evaluate_integer(func_to_handle(func),
665 if (ACPI_SUCCESS(status) && sta)
670 pci_bus_read_config_dword(slot->bus,
671 PCI_DEVFN(slot->device,
673 PCI_VENDOR_ID, &dvid);
674 if (dvid != 0xffffffff) {
681 return (unsigned int)sta;
685 * trim_stale_devices - remove PCI devices that are not responding.
686 * @dev: PCI device to start walking the hierarchy from.
688 static void trim_stale_devices(struct pci_dev *dev)
690 acpi_handle handle = ACPI_HANDLE(&dev->dev);
691 struct pci_bus *bus = dev->subordinate;
696 unsigned long long sta;
698 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
699 alive = ACPI_SUCCESS(status) && sta == ACPI_STA_ALL;
704 /* Check if the device responds. */
705 alive = pci_bus_read_dev_vendor_id(dev->bus, dev->devfn, &v, 0);
708 pci_stop_and_remove_bus_device(dev);
710 acpiphp_bus_trim(handle);
712 struct pci_dev *child, *tmp;
714 /* The device is a bridge. so check the bus below it. */
715 pm_runtime_get_sync(&dev->dev);
716 list_for_each_entry_safe(child, tmp, &bus->devices, bus_list)
717 trim_stale_devices(child);
719 pm_runtime_put(&dev->dev);
724 * acpiphp_check_bridge - re-enumerate devices
725 * @bridge: where to begin re-enumeration
727 * Iterate over all slots under this bridge and make sure that if a
728 * card is present they are enabled, and if not they are disabled.
730 static void acpiphp_check_bridge(struct acpiphp_bridge *bridge)
732 struct acpiphp_slot *slot;
734 list_for_each_entry(slot, &bridge->slots, node) {
735 struct pci_bus *bus = slot->bus;
736 struct pci_dev *dev, *tmp;
738 mutex_lock(&slot->crit_sect);
739 /* wake up all functions */
740 if (get_slot_status(slot) == ACPI_STA_ALL) {
741 /* remove stale devices if any */
742 list_for_each_entry_safe(dev, tmp, &bus->devices,
744 if (PCI_SLOT(dev->devfn) == slot->device)
745 trim_stale_devices(dev);
747 /* configure all functions */
752 mutex_unlock(&slot->crit_sect);
756 static void acpiphp_set_hpp_values(struct pci_bus *bus)
760 list_for_each_entry(dev, &bus->devices, bus_list)
761 pci_configure_slot(dev);
765 * Remove devices for which we could not assign resources, call
766 * arch specific code to fix-up the bus
768 static void acpiphp_sanitize_bus(struct pci_bus *bus)
770 struct pci_dev *dev, *tmp;
772 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM;
774 list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list) {
775 for (i=0; i<PCI_BRIDGE_RESOURCES; i++) {
776 struct resource *res = &dev->resource[i];
777 if ((res->flags & type_mask) && !res->start &&
779 /* Could not assign a required resources
780 * for this device, remove it */
781 pci_stop_and_remove_bus_device(dev);
789 * ACPI event handlers
792 void acpiphp_check_host_bridge(acpi_handle handle)
794 struct acpiphp_bridge *bridge;
796 bridge = acpiphp_handle_to_bridge(handle);
798 acpiphp_check_bridge(bridge);
803 static void hotplug_event(acpi_handle handle, u32 type, void *data)
805 struct acpiphp_context *context = data;
806 struct acpiphp_func *func = &context->func;
807 struct acpiphp_bridge *bridge;
809 struct acpi_buffer buffer = { .length = sizeof(objname),
810 .pointer = objname };
812 mutex_lock(&acpiphp_context_lock);
813 bridge = context->bridge;
817 mutex_unlock(&acpiphp_context_lock);
819 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
822 case ACPI_NOTIFY_BUS_CHECK:
823 /* bus re-enumerate */
824 dbg("%s: Bus check notify on %s\n", __func__, objname);
825 dbg("%s: re-enumerating slots under %s\n", __func__, objname);
827 acpiphp_check_bridge(bridge);
829 struct acpiphp_slot *slot = func->slot;
831 mutex_lock(&slot->crit_sect);
833 mutex_unlock(&slot->crit_sect);
837 case ACPI_NOTIFY_DEVICE_CHECK:
839 dbg("%s: Device check notify on %s\n", __func__, objname);
841 acpiphp_check_bridge(bridge);
843 acpiphp_check_bridge(func->parent);
847 case ACPI_NOTIFY_EJECT_REQUEST:
848 /* request device eject */
849 dbg("%s: Device eject notify on %s\n", __func__, objname);
850 acpiphp_disable_and_eject_slot(func->slot);
858 static void hotplug_event_work(struct work_struct *work)
860 struct acpiphp_context *context;
861 struct acpi_hp_work *hp_work;
863 hp_work = container_of(work, struct acpi_hp_work, work);
864 context = hp_work->context;
865 acpi_scan_lock_acquire();
867 hotplug_event(hp_work->handle, hp_work->type, context);
869 acpi_scan_lock_release();
870 kfree(hp_work); /* allocated in handle_hotplug_event() */
871 put_bridge(context->func.parent);
875 * handle_hotplug_event - handle ACPI hotplug event
876 * @handle: Notify()'ed acpi_handle
878 * @data: pointer to acpiphp_context structure
880 * Handles ACPI event notification on slots.
882 static void handle_hotplug_event(acpi_handle handle, u32 type, void *data)
884 struct acpiphp_context *context;
887 case ACPI_NOTIFY_BUS_CHECK:
888 case ACPI_NOTIFY_DEVICE_CHECK:
889 case ACPI_NOTIFY_EJECT_REQUEST:
892 case ACPI_NOTIFY_DEVICE_WAKE:
895 case ACPI_NOTIFY_FREQUENCY_MISMATCH:
896 acpi_handle_err(handle, "Device cannot be configured due "
897 "to a frequency mismatch\n");
900 case ACPI_NOTIFY_BUS_MODE_MISMATCH:
901 acpi_handle_err(handle, "Device cannot be configured due "
902 "to a bus mode mismatch\n");
905 case ACPI_NOTIFY_POWER_FAULT:
906 acpi_handle_err(handle, "Device has suffered a power fault\n");
910 acpi_handle_warn(handle, "Unsupported event type 0x%x\n", type);
914 mutex_lock(&acpiphp_context_lock);
915 context = acpiphp_get_context(handle);
917 get_bridge(context->func.parent);
918 acpiphp_put_context(context);
919 alloc_acpi_hp_work(handle, type, context, hotplug_event_work);
921 mutex_unlock(&acpiphp_context_lock);
925 * Create hotplug slots for the PCI bus.
926 * It should always return 0 to avoid skipping following notifiers.
928 void acpiphp_enumerate_slots(struct pci_bus *bus)
930 struct acpiphp_bridge *bridge;
934 if (acpiphp_disabled)
937 handle = ACPI_HANDLE(bus->bridge);
941 bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
943 acpi_handle_err(handle, "No memory for bridge object\n");
947 INIT_LIST_HEAD(&bridge->slots);
948 kref_init(&bridge->ref);
949 bridge->pci_dev = pci_dev_get(bus->self);
950 bridge->pci_bus = bus;
953 * Grab a ref to the subordinate PCI bus in case the bus is
954 * removed via PCI core logical hotplug. The ref pins the bus
955 * (which we access during module unload).
957 get_device(&bus->dev);
959 if (!pci_is_root_bus(bridge->pci_bus)) {
960 struct acpiphp_context *context;
963 * This bridge should have been registered as a hotplug function
964 * under its parent, so the context has to be there. If not, we
967 mutex_lock(&acpiphp_context_lock);
968 context = acpiphp_get_context(handle);
969 if (WARN_ON(!context)) {
970 mutex_unlock(&acpiphp_context_lock);
971 put_device(&bus->dev);
975 bridge->context = context;
976 context->bridge = bridge;
977 /* Get a reference to the parent bridge. */
978 get_bridge(context->func.parent);
979 mutex_unlock(&acpiphp_context_lock);
982 /* must be added to the list prior to calling register_slot */
983 mutex_lock(&bridge_mutex);
984 list_add(&bridge->list, &bridge_list);
985 mutex_unlock(&bridge_mutex);
987 /* register all slot objects under this bridge */
988 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1,
989 register_slot, NULL, bridge, NULL);
990 if (ACPI_FAILURE(status)) {
991 acpi_handle_err(handle, "failed to register slots\n");
992 cleanup_bridge(bridge);
997 /* Destroy hotplug slots associated with the PCI bus */
998 void acpiphp_remove_slots(struct pci_bus *bus)
1000 struct acpiphp_bridge *bridge;
1002 if (acpiphp_disabled)
1005 mutex_lock(&bridge_mutex);
1006 list_for_each_entry(bridge, &bridge_list, list)
1007 if (bridge->pci_bus == bus) {
1008 mutex_unlock(&bridge_mutex);
1009 cleanup_bridge(bridge);
1014 mutex_unlock(&bridge_mutex);
1018 * acpiphp_enable_slot - power on slot
1019 * @slot: ACPI PHP slot
1021 int acpiphp_enable_slot(struct acpiphp_slot *slot)
1023 mutex_lock(&slot->crit_sect);
1024 /* configure all functions */
1025 if (!(slot->flags & SLOT_ENABLED))
1028 mutex_unlock(&slot->crit_sect);
1033 * acpiphp_disable_and_eject_slot - power off and eject slot
1034 * @slot: ACPI PHP slot
1036 int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot)
1038 struct acpiphp_func *func;
1041 mutex_lock(&slot->crit_sect);
1043 /* unconfigure all functions */
1046 list_for_each_entry(func, &slot->funcs, sibling)
1047 if (func->flags & FUNC_HAS_EJ0) {
1048 acpi_handle handle = func_to_handle(func);
1050 if (ACPI_FAILURE(acpi_evaluate_ej0(handle)))
1051 acpi_handle_err(handle, "_EJ0 failed\n");
1056 mutex_unlock(&slot->crit_sect);
1065 u8 acpiphp_get_power_status(struct acpiphp_slot *slot)
1067 return (slot->flags & SLOT_ENABLED);
1075 u8 acpiphp_get_latch_status(struct acpiphp_slot *slot)
1077 return !(get_slot_status(slot) & ACPI_STA_DEVICE_UI);
1082 * adapter presence : 1
1085 u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot)
1087 return !!get_slot_status(slot);