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/init.h>
45 #include <linux/module.h>
47 #include <linux/kernel.h>
48 #include <linux/pci.h>
49 #include <linux/pci_hotplug.h>
50 #include <linux/pci-acpi.h>
51 #include <linux/pm_runtime.h>
52 #include <linux/mutex.h>
53 #include <linux/slab.h>
54 #include <linux/acpi.h>
59 static LIST_HEAD(bridge_list);
60 static DEFINE_MUTEX(bridge_mutex);
61 static DEFINE_MUTEX(acpiphp_context_lock);
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 if (status != AE_NOT_FOUND)
283 acpi_handle_warn(handle,
284 "can't evaluate _ADR (%#x)\n", status);
288 device = (adr >> 16) & 0xffff;
289 function = adr & 0xffff;
291 mutex_lock(&acpiphp_context_lock);
292 context = acpiphp_init_context(handle);
294 mutex_unlock(&acpiphp_context_lock);
295 acpi_handle_err(handle, "No hotplug context\n");
298 newfunc = &context->func;
299 newfunc->function = function;
300 newfunc->parent = bridge;
301 mutex_unlock(&acpiphp_context_lock);
303 if (acpi_has_method(handle, "_EJ0"))
304 newfunc->flags = FUNC_HAS_EJ0;
306 if (acpi_has_method(handle, "_STA"))
307 newfunc->flags |= FUNC_HAS_STA;
309 if (acpi_has_method(handle, "_DCK"))
310 newfunc->flags |= FUNC_HAS_DCK;
312 /* search for objects that share the same slot */
313 list_for_each_entry(slot, &bridge->slots, node)
314 if (slot->device == device)
317 slot = kzalloc(sizeof(struct acpiphp_slot), GFP_KERNEL);
319 status = AE_NO_MEMORY;
323 slot->bus = bridge->pci_bus;
324 slot->device = device;
325 INIT_LIST_HEAD(&slot->funcs);
326 mutex_init(&slot->crit_sect);
328 list_add_tail(&slot->node, &bridge->slots);
330 /* Register slots for ejectable functions only. */
331 if (acpi_pci_check_ejectable(pbus, handle) || is_dock_device(handle)) {
332 unsigned long long sun;
336 status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun);
337 if (ACPI_FAILURE(status))
338 sun = bridge->nr_slots;
340 pr_debug("found ACPI PCI Hotplug slot %llu at PCI %04x:%02x:%02x\n",
341 sun, pci_domain_nr(pbus), pbus->number, device);
343 retval = acpiphp_register_hotplug_slot(slot, sun);
347 if (retval == -EBUSY)
348 pr_warn("Slot %llu already registered by another "
349 "hotplug driver\n", sun);
351 pr_warn("acpiphp_register_hotplug_slot failed "
352 "(err code = 0x%x)\n", retval);
354 /* Even if the slot registration fails, we can still use it. */
358 newfunc->slot = slot;
359 list_add_tail(&newfunc->sibling, &slot->funcs);
361 if (pci_bus_read_dev_vendor_id(pbus, PCI_DEVFN(device, function),
363 slot->flags |= SLOT_ENABLED;
365 if (is_dock_device(handle)) {
366 /* we don't want to call this device's _EJ0
367 * because we want the dock notify handler
368 * to call it after it calls _DCK
370 newfunc->flags &= ~FUNC_HAS_EJ0;
371 if (register_hotplug_dock_device(handle,
372 &acpiphp_dock_ops, context,
373 acpiphp_dock_init, acpiphp_dock_release))
374 pr_debug("failed to register dock device\n");
377 /* install notify handler */
378 if (!(newfunc->flags & FUNC_HAS_DCK)) {
379 status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
380 handle_hotplug_event,
382 if (ACPI_FAILURE(status))
383 acpi_handle_err(handle,
384 "failed to install notify handler\n");
390 mutex_lock(&acpiphp_context_lock);
391 acpiphp_put_context(context);
392 mutex_unlock(&acpiphp_context_lock);
396 static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle)
398 struct acpiphp_context *context;
399 struct acpiphp_bridge *bridge = NULL;
401 mutex_lock(&acpiphp_context_lock);
402 context = acpiphp_get_context(handle);
404 bridge = context->bridge;
408 acpiphp_put_context(context);
410 mutex_unlock(&acpiphp_context_lock);
414 static void cleanup_bridge(struct acpiphp_bridge *bridge)
416 struct acpiphp_slot *slot;
417 struct acpiphp_func *func;
420 list_for_each_entry(slot, &bridge->slots, node) {
421 list_for_each_entry(func, &slot->funcs, sibling) {
422 acpi_handle handle = func_to_handle(func);
424 if (is_dock_device(handle))
425 unregister_hotplug_dock_device(handle);
427 if (!(func->flags & FUNC_HAS_DCK)) {
428 status = acpi_remove_notify_handler(handle,
430 handle_hotplug_event);
431 if (ACPI_FAILURE(status))
432 pr_err("failed to remove notify handler\n");
435 slot->flags |= SLOT_IS_GOING_AWAY;
437 acpiphp_unregister_hotplug_slot(slot);
440 mutex_lock(&bridge_mutex);
441 list_del(&bridge->list);
442 mutex_unlock(&bridge_mutex);
444 mutex_lock(&acpiphp_context_lock);
445 bridge->is_going_away = true;
446 mutex_unlock(&acpiphp_context_lock);
450 * acpiphp_max_busnr - return the highest reserved bus number under the given bus.
451 * @bus: bus to start search with
453 static unsigned char acpiphp_max_busnr(struct pci_bus *bus)
455 struct list_head *tmp;
456 unsigned char max, n;
459 * pci_bus_max_busnr will return the highest
460 * reserved busnr for all these children.
461 * that is equivalent to the bus->subordinate
462 * value. We don't want to use the parent's
463 * bus->subordinate value because it could have
466 max = bus->busn_res.start;
468 list_for_each(tmp, &bus->children) {
469 n = pci_bus_max_busnr(pci_bus_b(tmp));
477 * acpiphp_bus_trim - Trim device objects in an ACPI namespace subtree.
478 * @handle: ACPI device object handle to start from.
480 static void acpiphp_bus_trim(acpi_handle handle)
482 struct acpi_device *adev = NULL;
484 acpi_bus_get_device(handle, &adev);
490 * acpiphp_bus_add - Scan ACPI namespace subtree.
491 * @handle: ACPI object handle to start the scan from.
493 static void acpiphp_bus_add(acpi_handle handle)
495 struct acpi_device *adev = NULL;
497 acpi_bus_scan(handle);
498 acpi_bus_get_device(handle, &adev);
499 if (acpi_device_enumerated(adev))
500 acpi_device_set_power(adev, ACPI_STATE_D0);
503 static void acpiphp_set_acpi_region(struct acpiphp_slot *slot)
505 struct acpiphp_func *func;
506 union acpi_object params[2];
507 struct acpi_object_list arg_list;
509 list_for_each_entry(func, &slot->funcs, sibling) {
511 arg_list.pointer = params;
512 params[0].type = ACPI_TYPE_INTEGER;
513 params[0].integer.value = ACPI_ADR_SPACE_PCI_CONFIG;
514 params[1].type = ACPI_TYPE_INTEGER;
515 params[1].integer.value = 1;
516 /* _REG is optional, we don't care about if there is failure */
517 acpi_evaluate_object(func_to_handle(func), "_REG", &arg_list,
522 static void check_hotplug_bridge(struct acpiphp_slot *slot, struct pci_dev *dev)
524 struct acpiphp_func *func;
526 /* quirk, or pcie could set it already */
527 if (dev->is_hotplug_bridge)
530 list_for_each_entry(func, &slot->funcs, sibling) {
531 if (PCI_FUNC(dev->devfn) == func->function) {
532 dev->is_hotplug_bridge = 1;
538 static int acpiphp_rescan_slot(struct acpiphp_slot *slot)
540 struct acpiphp_func *func;
542 list_for_each_entry(func, &slot->funcs, sibling)
543 acpiphp_bus_add(func_to_handle(func));
545 return pci_scan_slot(slot->bus, PCI_DEVFN(slot->device, 0));
549 * enable_slot - enable, configure a slot
550 * @slot: slot to be enabled
552 * This function should be called per *physical slot*,
553 * not per each slot object in ACPI namespace.
555 static void __ref enable_slot(struct acpiphp_slot *slot)
558 struct pci_bus *bus = slot->bus;
559 struct acpiphp_func *func;
563 acpiphp_rescan_slot(slot);
564 max = acpiphp_max_busnr(bus);
565 for (pass = 0; pass < 2; pass++) {
566 list_for_each_entry(dev, &bus->devices, bus_list) {
567 if (PCI_SLOT(dev->devfn) != slot->device)
570 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
571 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
572 max = pci_scan_bridge(bus, dev, max, pass);
573 if (pass && dev->subordinate) {
574 check_hotplug_bridge(slot, dev);
575 pcibios_resource_survey_bus(dev->subordinate);
576 __pci_bus_size_bridges(dev->subordinate,
582 __pci_bus_assign_resources(bus, &add_list, NULL);
584 acpiphp_sanitize_bus(bus);
585 acpiphp_set_hpp_values(bus);
586 acpiphp_set_acpi_region(slot);
588 list_for_each_entry(dev, &bus->devices, bus_list) {
589 /* Assume that newly added devices are powered on already. */
591 dev->current_state = PCI_D0;
594 pci_bus_add_devices(bus);
596 slot->flags |= SLOT_ENABLED;
597 list_for_each_entry(func, &slot->funcs, sibling) {
598 dev = pci_get_slot(bus, PCI_DEVFN(slot->device,
601 /* Do not set SLOT_ENABLED flag if some funcs
603 slot->flags &= (~SLOT_ENABLED);
609 /* return first device in slot, acquiring a reference on it */
610 static struct pci_dev *dev_in_slot(struct acpiphp_slot *slot)
612 struct pci_bus *bus = slot->bus;
614 struct pci_dev *ret = NULL;
616 down_read(&pci_bus_sem);
617 list_for_each_entry(dev, &bus->devices, bus_list)
618 if (PCI_SLOT(dev->devfn) == slot->device) {
619 ret = pci_dev_get(dev);
622 up_read(&pci_bus_sem);
628 * disable_slot - disable a slot
629 * @slot: ACPI PHP slot
631 static void disable_slot(struct acpiphp_slot *slot)
633 struct acpiphp_func *func;
634 struct pci_dev *pdev;
637 * enable_slot() enumerates all functions in this device via
638 * pci_scan_slot(), whether they have associated ACPI hotplug
639 * methods (_EJ0, etc.) or not. Therefore, we remove all functions
642 while ((pdev = dev_in_slot(slot))) {
643 pci_stop_and_remove_bus_device(pdev);
647 list_for_each_entry(func, &slot->funcs, sibling)
648 acpiphp_bus_trim(func_to_handle(func));
650 slot->flags &= (~SLOT_ENABLED);
653 static bool acpiphp_no_hotplug(acpi_handle handle)
655 struct acpi_device *adev = NULL;
657 acpi_bus_get_device(handle, &adev);
658 return adev && adev->flags.no_hotplug;
661 static bool slot_no_hotplug(struct acpiphp_slot *slot)
663 struct acpiphp_func *func;
665 list_for_each_entry(func, &slot->funcs, sibling)
666 if (acpiphp_no_hotplug(func_to_handle(func)))
673 * get_slot_status - get ACPI slot status
674 * @slot: ACPI PHP slot
676 * If a slot has _STA for each function and if any one of them
677 * returned non-zero status, return it.
679 * If a slot doesn't have _STA and if any one of its functions'
680 * configuration space is configured, return 0x0f as a _STA.
682 * Otherwise return 0.
684 static unsigned int get_slot_status(struct acpiphp_slot *slot)
686 unsigned long long sta = 0;
687 struct acpiphp_func *func;
689 list_for_each_entry(func, &slot->funcs, sibling) {
690 if (func->flags & FUNC_HAS_STA) {
693 status = acpi_evaluate_integer(func_to_handle(func),
695 if (ACPI_SUCCESS(status) && sta)
700 pci_bus_read_config_dword(slot->bus,
701 PCI_DEVFN(slot->device,
703 PCI_VENDOR_ID, &dvid);
704 if (dvid != 0xffffffff) {
711 return (unsigned int)sta;
715 * trim_stale_devices - remove PCI devices that are not responding.
716 * @dev: PCI device to start walking the hierarchy from.
718 static void trim_stale_devices(struct pci_dev *dev)
720 acpi_handle handle = ACPI_HANDLE(&dev->dev);
721 struct pci_bus *bus = dev->subordinate;
726 unsigned long long sta;
728 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
729 alive = (ACPI_SUCCESS(status) && sta == ACPI_STA_ALL)
730 || acpiphp_no_hotplug(handle);
735 /* Check if the device responds. */
736 alive = pci_bus_read_dev_vendor_id(dev->bus, dev->devfn, &v, 0);
739 pci_stop_and_remove_bus_device(dev);
741 acpiphp_bus_trim(handle);
743 struct pci_dev *child, *tmp;
745 /* The device is a bridge. so check the bus below it. */
746 pm_runtime_get_sync(&dev->dev);
747 list_for_each_entry_safe_reverse(child, tmp, &bus->devices, bus_list)
748 trim_stale_devices(child);
750 pm_runtime_put(&dev->dev);
755 * acpiphp_check_bridge - re-enumerate devices
756 * @bridge: where to begin re-enumeration
758 * Iterate over all slots under this bridge and make sure that if a
759 * card is present they are enabled, and if not they are disabled.
761 static void acpiphp_check_bridge(struct acpiphp_bridge *bridge)
763 struct acpiphp_slot *slot;
765 /* Bail out if the bridge is going away. */
766 if (bridge->is_going_away)
769 list_for_each_entry(slot, &bridge->slots, node) {
770 struct pci_bus *bus = slot->bus;
771 struct pci_dev *dev, *tmp;
773 mutex_lock(&slot->crit_sect);
774 if (slot_no_hotplug(slot)) {
776 } else if (get_slot_status(slot) == ACPI_STA_ALL) {
777 /* remove stale devices if any */
778 list_for_each_entry_safe_reverse(dev, tmp,
779 &bus->devices, bus_list)
780 if (PCI_SLOT(dev->devfn) == slot->device)
781 trim_stale_devices(dev);
783 /* configure all functions */
788 mutex_unlock(&slot->crit_sect);
792 static void acpiphp_set_hpp_values(struct pci_bus *bus)
796 list_for_each_entry(dev, &bus->devices, bus_list)
797 pci_configure_slot(dev);
801 * Remove devices for which we could not assign resources, call
802 * arch specific code to fix-up the bus
804 static void acpiphp_sanitize_bus(struct pci_bus *bus)
806 struct pci_dev *dev, *tmp;
808 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM;
810 list_for_each_entry_safe_reverse(dev, tmp, &bus->devices, bus_list) {
811 for (i=0; i<PCI_BRIDGE_RESOURCES; i++) {
812 struct resource *res = &dev->resource[i];
813 if ((res->flags & type_mask) && !res->start &&
815 /* Could not assign a required resources
816 * for this device, remove it */
817 pci_stop_and_remove_bus_device(dev);
825 * ACPI event handlers
828 void acpiphp_check_host_bridge(acpi_handle handle)
830 struct acpiphp_bridge *bridge;
832 bridge = acpiphp_handle_to_bridge(handle);
834 pci_lock_rescan_remove();
836 acpiphp_check_bridge(bridge);
838 pci_unlock_rescan_remove();
843 static int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot);
845 static void hotplug_event(acpi_handle handle, u32 type, void *data)
847 struct acpiphp_context *context = data;
848 struct acpiphp_func *func = &context->func;
849 struct acpiphp_bridge *bridge;
851 struct acpi_buffer buffer = { .length = sizeof(objname),
852 .pointer = objname };
854 mutex_lock(&acpiphp_context_lock);
855 bridge = context->bridge;
859 mutex_unlock(&acpiphp_context_lock);
861 pci_lock_rescan_remove();
862 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
865 case ACPI_NOTIFY_BUS_CHECK:
866 /* bus re-enumerate */
867 pr_debug("%s: Bus check notify on %s\n", __func__, objname);
868 pr_debug("%s: re-enumerating slots under %s\n",
871 acpiphp_check_bridge(bridge);
873 struct acpiphp_slot *slot = func->slot;
875 if (slot->flags & SLOT_IS_GOING_AWAY)
878 mutex_lock(&slot->crit_sect);
880 mutex_unlock(&slot->crit_sect);
884 case ACPI_NOTIFY_DEVICE_CHECK:
886 pr_debug("%s: Device check notify on %s\n", __func__, objname);
888 acpiphp_check_bridge(bridge);
890 struct acpiphp_slot *slot = func->slot;
893 if (slot->flags & SLOT_IS_GOING_AWAY)
897 * Check if anything has changed in the slot and rescan
898 * from the parent if that's the case.
900 mutex_lock(&slot->crit_sect);
901 ret = acpiphp_rescan_slot(slot);
902 mutex_unlock(&slot->crit_sect);
904 acpiphp_check_bridge(func->parent);
908 case ACPI_NOTIFY_EJECT_REQUEST:
909 /* request device eject */
910 pr_debug("%s: Device eject notify on %s\n", __func__, objname);
911 acpiphp_disable_and_eject_slot(func->slot);
915 pci_unlock_rescan_remove();
920 static void hotplug_event_work(void *data, u32 type)
922 struct acpiphp_context *context = data;
923 acpi_handle handle = context->handle;
925 acpi_scan_lock_acquire();
927 hotplug_event(handle, type, context);
929 acpi_scan_lock_release();
930 acpi_evaluate_hotplug_ost(handle, type, ACPI_OST_SC_SUCCESS, NULL);
931 put_bridge(context->func.parent);
935 * handle_hotplug_event - handle ACPI hotplug event
936 * @handle: Notify()'ed acpi_handle
938 * @data: pointer to acpiphp_context structure
940 * Handles ACPI event notification on slots.
942 static void handle_hotplug_event(acpi_handle handle, u32 type, void *data)
944 struct acpiphp_context *context;
945 u32 ost_code = ACPI_OST_SC_SUCCESS;
949 case ACPI_NOTIFY_BUS_CHECK:
950 case ACPI_NOTIFY_DEVICE_CHECK:
952 case ACPI_NOTIFY_EJECT_REQUEST:
953 ost_code = ACPI_OST_SC_EJECT_IN_PROGRESS;
954 acpi_evaluate_hotplug_ost(handle, type, ost_code, NULL);
957 case ACPI_NOTIFY_DEVICE_WAKE:
960 case ACPI_NOTIFY_FREQUENCY_MISMATCH:
961 acpi_handle_err(handle, "Device cannot be configured due "
962 "to a frequency mismatch\n");
965 case ACPI_NOTIFY_BUS_MODE_MISMATCH:
966 acpi_handle_err(handle, "Device cannot be configured due "
967 "to a bus mode mismatch\n");
970 case ACPI_NOTIFY_POWER_FAULT:
971 acpi_handle_err(handle, "Device has suffered a power fault\n");
975 acpi_handle_warn(handle, "Unsupported event type 0x%x\n", type);
976 ost_code = ACPI_OST_SC_UNRECOGNIZED_NOTIFY;
980 mutex_lock(&acpiphp_context_lock);
981 context = acpiphp_get_context(handle);
982 if (!context || WARN_ON(context->handle != handle)
983 || context->func.parent->is_going_away)
986 get_bridge(context->func.parent);
987 acpiphp_put_context(context);
988 status = acpi_hotplug_execute(hotplug_event_work, context, type);
989 if (ACPI_SUCCESS(status)) {
990 mutex_unlock(&acpiphp_context_lock);
993 put_bridge(context->func.parent);
996 mutex_unlock(&acpiphp_context_lock);
997 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
1000 acpi_evaluate_hotplug_ost(handle, type, ost_code, NULL);
1004 * Create hotplug slots for the PCI bus.
1005 * It should always return 0 to avoid skipping following notifiers.
1007 void acpiphp_enumerate_slots(struct pci_bus *bus)
1009 struct acpiphp_bridge *bridge;
1013 if (acpiphp_disabled)
1016 handle = ACPI_HANDLE(bus->bridge);
1020 bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
1022 acpi_handle_err(handle, "No memory for bridge object\n");
1026 INIT_LIST_HEAD(&bridge->slots);
1027 kref_init(&bridge->ref);
1028 bridge->pci_dev = pci_dev_get(bus->self);
1029 bridge->pci_bus = bus;
1032 * Grab a ref to the subordinate PCI bus in case the bus is
1033 * removed via PCI core logical hotplug. The ref pins the bus
1034 * (which we access during module unload).
1036 get_device(&bus->dev);
1038 if (!pci_is_root_bus(bridge->pci_bus)) {
1039 struct acpiphp_context *context;
1042 * This bridge should have been registered as a hotplug function
1043 * under its parent, so the context should be there, unless the
1044 * parent is going to be handled by pciehp, in which case this
1045 * bridge is not interesting to us either.
1047 mutex_lock(&acpiphp_context_lock);
1048 context = acpiphp_get_context(handle);
1050 mutex_unlock(&acpiphp_context_lock);
1051 put_device(&bus->dev);
1052 pci_dev_put(bridge->pci_dev);
1056 bridge->context = context;
1057 context->bridge = bridge;
1058 /* Get a reference to the parent bridge. */
1059 get_bridge(context->func.parent);
1060 mutex_unlock(&acpiphp_context_lock);
1063 /* must be added to the list prior to calling register_slot */
1064 mutex_lock(&bridge_mutex);
1065 list_add(&bridge->list, &bridge_list);
1066 mutex_unlock(&bridge_mutex);
1068 /* register all slot objects under this bridge */
1069 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1,
1070 register_slot, NULL, bridge, NULL);
1071 if (ACPI_FAILURE(status)) {
1072 acpi_handle_err(handle, "failed to register slots\n");
1073 cleanup_bridge(bridge);
1078 /* Destroy hotplug slots associated with the PCI bus */
1079 void acpiphp_remove_slots(struct pci_bus *bus)
1081 struct acpiphp_bridge *bridge;
1083 if (acpiphp_disabled)
1086 mutex_lock(&bridge_mutex);
1087 list_for_each_entry(bridge, &bridge_list, list)
1088 if (bridge->pci_bus == bus) {
1089 mutex_unlock(&bridge_mutex);
1090 cleanup_bridge(bridge);
1095 mutex_unlock(&bridge_mutex);
1099 * acpiphp_enable_slot - power on slot
1100 * @slot: ACPI PHP slot
1102 int acpiphp_enable_slot(struct acpiphp_slot *slot)
1104 pci_lock_rescan_remove();
1106 if (slot->flags & SLOT_IS_GOING_AWAY)
1109 mutex_lock(&slot->crit_sect);
1110 /* configure all functions */
1111 if (!(slot->flags & SLOT_ENABLED))
1114 mutex_unlock(&slot->crit_sect);
1116 pci_unlock_rescan_remove();
1121 * acpiphp_disable_and_eject_slot - power off and eject slot
1122 * @slot: ACPI PHP slot
1124 static int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot)
1126 struct acpiphp_func *func;
1128 if (slot->flags & SLOT_IS_GOING_AWAY)
1131 mutex_lock(&slot->crit_sect);
1133 /* unconfigure all functions */
1136 list_for_each_entry(func, &slot->funcs, sibling)
1137 if (func->flags & FUNC_HAS_EJ0) {
1138 acpi_handle handle = func_to_handle(func);
1140 if (ACPI_FAILURE(acpi_evaluate_ej0(handle)))
1141 acpi_handle_err(handle, "_EJ0 failed\n");
1146 mutex_unlock(&slot->crit_sect);
1150 int acpiphp_disable_slot(struct acpiphp_slot *slot)
1154 pci_lock_rescan_remove();
1155 ret = acpiphp_disable_and_eject_slot(slot);
1156 pci_unlock_rescan_remove();
1164 u8 acpiphp_get_power_status(struct acpiphp_slot *slot)
1166 return (slot->flags & SLOT_ENABLED);
1173 u8 acpiphp_get_latch_status(struct acpiphp_slot *slot)
1175 return !(get_slot_status(slot) & ACPI_STA_DEVICE_UI);
1179 * adapter presence : 1
1182 u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot)
1184 return !!get_slot_status(slot);