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");
436 acpiphp_unregister_hotplug_slot(slot);
439 mutex_lock(&bridge_mutex);
440 list_del(&bridge->list);
441 mutex_unlock(&bridge_mutex);
445 * acpiphp_max_busnr - return the highest reserved bus number under the given bus.
446 * @bus: bus to start search with
448 static unsigned char acpiphp_max_busnr(struct pci_bus *bus)
450 struct list_head *tmp;
451 unsigned char max, n;
454 * pci_bus_max_busnr will return the highest
455 * reserved busnr for all these children.
456 * that is equivalent to the bus->subordinate
457 * value. We don't want to use the parent's
458 * bus->subordinate value because it could have
461 max = bus->busn_res.start;
463 list_for_each(tmp, &bus->children) {
464 n = pci_bus_max_busnr(pci_bus_b(tmp));
472 * acpiphp_bus_trim - Trim device objects in an ACPI namespace subtree.
473 * @handle: ACPI device object handle to start from.
475 static void acpiphp_bus_trim(acpi_handle handle)
477 struct acpi_device *adev = NULL;
479 acpi_bus_get_device(handle, &adev);
485 * acpiphp_bus_add - Scan ACPI namespace subtree.
486 * @handle: ACPI object handle to start the scan from.
488 static void acpiphp_bus_add(acpi_handle handle)
490 struct acpi_device *adev = NULL;
492 acpi_bus_scan(handle);
493 acpi_bus_get_device(handle, &adev);
495 acpi_device_set_power(adev, ACPI_STATE_D0);
498 static void acpiphp_set_acpi_region(struct acpiphp_slot *slot)
500 struct acpiphp_func *func;
501 union acpi_object params[2];
502 struct acpi_object_list arg_list;
504 list_for_each_entry(func, &slot->funcs, sibling) {
506 arg_list.pointer = params;
507 params[0].type = ACPI_TYPE_INTEGER;
508 params[0].integer.value = ACPI_ADR_SPACE_PCI_CONFIG;
509 params[1].type = ACPI_TYPE_INTEGER;
510 params[1].integer.value = 1;
511 /* _REG is optional, we don't care about if there is failure */
512 acpi_evaluate_object(func_to_handle(func), "_REG", &arg_list,
517 static void check_hotplug_bridge(struct acpiphp_slot *slot, struct pci_dev *dev)
519 struct acpiphp_func *func;
521 /* quirk, or pcie could set it already */
522 if (dev->is_hotplug_bridge)
525 list_for_each_entry(func, &slot->funcs, sibling) {
526 if (PCI_FUNC(dev->devfn) == func->function) {
527 dev->is_hotplug_bridge = 1;
533 static int acpiphp_rescan_slot(struct acpiphp_slot *slot)
535 struct acpiphp_func *func;
537 list_for_each_entry(func, &slot->funcs, sibling)
538 acpiphp_bus_add(func_to_handle(func));
540 return pci_scan_slot(slot->bus, PCI_DEVFN(slot->device, 0));
544 * enable_slot - enable, configure a slot
545 * @slot: slot to be enabled
547 * This function should be called per *physical slot*,
548 * not per each slot object in ACPI namespace.
550 static void __ref enable_slot(struct acpiphp_slot *slot)
553 struct pci_bus *bus = slot->bus;
554 struct acpiphp_func *func;
558 acpiphp_rescan_slot(slot);
559 max = acpiphp_max_busnr(bus);
560 for (pass = 0; pass < 2; pass++) {
561 list_for_each_entry(dev, &bus->devices, bus_list) {
562 if (PCI_SLOT(dev->devfn) != slot->device)
565 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
566 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
567 max = pci_scan_bridge(bus, dev, max, pass);
568 if (pass && dev->subordinate) {
569 check_hotplug_bridge(slot, dev);
570 pcibios_resource_survey_bus(dev->subordinate);
571 __pci_bus_size_bridges(dev->subordinate,
577 __pci_bus_assign_resources(bus, &add_list, NULL);
579 acpiphp_sanitize_bus(bus);
580 acpiphp_set_hpp_values(bus);
581 acpiphp_set_acpi_region(slot);
583 list_for_each_entry(dev, &bus->devices, bus_list) {
584 /* Assume that newly added devices are powered on already. */
586 dev->current_state = PCI_D0;
589 pci_bus_add_devices(bus);
591 slot->flags |= SLOT_ENABLED;
592 list_for_each_entry(func, &slot->funcs, sibling) {
593 dev = pci_get_slot(bus, PCI_DEVFN(slot->device,
596 /* Do not set SLOT_ENABLED flag if some funcs
598 slot->flags &= (~SLOT_ENABLED);
604 /* return first device in slot, acquiring a reference on it */
605 static struct pci_dev *dev_in_slot(struct acpiphp_slot *slot)
607 struct pci_bus *bus = slot->bus;
609 struct pci_dev *ret = NULL;
611 down_read(&pci_bus_sem);
612 list_for_each_entry(dev, &bus->devices, bus_list)
613 if (PCI_SLOT(dev->devfn) == slot->device) {
614 ret = pci_dev_get(dev);
617 up_read(&pci_bus_sem);
623 * disable_slot - disable a slot
624 * @slot: ACPI PHP slot
626 static void disable_slot(struct acpiphp_slot *slot)
628 struct acpiphp_func *func;
629 struct pci_dev *pdev;
632 * enable_slot() enumerates all functions in this device via
633 * pci_scan_slot(), whether they have associated ACPI hotplug
634 * methods (_EJ0, etc.) or not. Therefore, we remove all functions
637 while ((pdev = dev_in_slot(slot))) {
638 pci_stop_and_remove_bus_device(pdev);
642 list_for_each_entry(func, &slot->funcs, sibling)
643 acpiphp_bus_trim(func_to_handle(func));
645 slot->flags &= (~SLOT_ENABLED);
648 static bool acpiphp_no_hotplug(acpi_handle handle)
650 struct acpi_device *adev = NULL;
652 acpi_bus_get_device(handle, &adev);
653 return adev && adev->flags.no_hotplug;
656 static bool slot_no_hotplug(struct acpiphp_slot *slot)
658 struct acpiphp_func *func;
660 list_for_each_entry(func, &slot->funcs, sibling)
661 if (acpiphp_no_hotplug(func_to_handle(func)))
668 * get_slot_status - get ACPI slot status
669 * @slot: ACPI PHP slot
671 * If a slot has _STA for each function and if any one of them
672 * returned non-zero status, return it.
674 * If a slot doesn't have _STA and if any one of its functions'
675 * configuration space is configured, return 0x0f as a _STA.
677 * Otherwise return 0.
679 static unsigned int get_slot_status(struct acpiphp_slot *slot)
681 unsigned long long sta = 0;
682 struct acpiphp_func *func;
684 list_for_each_entry(func, &slot->funcs, sibling) {
685 if (func->flags & FUNC_HAS_STA) {
688 status = acpi_evaluate_integer(func_to_handle(func),
690 if (ACPI_SUCCESS(status) && sta)
695 pci_bus_read_config_dword(slot->bus,
696 PCI_DEVFN(slot->device,
698 PCI_VENDOR_ID, &dvid);
699 if (dvid != 0xffffffff) {
706 return (unsigned int)sta;
710 * trim_stale_devices - remove PCI devices that are not responding.
711 * @dev: PCI device to start walking the hierarchy from.
713 static void trim_stale_devices(struct pci_dev *dev)
715 acpi_handle handle = ACPI_HANDLE(&dev->dev);
716 struct pci_bus *bus = dev->subordinate;
721 unsigned long long sta;
723 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
724 alive = (ACPI_SUCCESS(status) && sta == ACPI_STA_ALL)
725 || acpiphp_no_hotplug(handle);
730 /* Check if the device responds. */
731 alive = pci_bus_read_dev_vendor_id(dev->bus, dev->devfn, &v, 0);
734 pci_stop_and_remove_bus_device(dev);
736 acpiphp_bus_trim(handle);
738 struct pci_dev *child, *tmp;
740 /* The device is a bridge. so check the bus below it. */
741 pm_runtime_get_sync(&dev->dev);
742 list_for_each_entry_safe(child, tmp, &bus->devices, bus_list)
743 trim_stale_devices(child);
745 pm_runtime_put(&dev->dev);
750 * acpiphp_check_bridge - re-enumerate devices
751 * @bridge: where to begin re-enumeration
753 * Iterate over all slots under this bridge and make sure that if a
754 * card is present they are enabled, and if not they are disabled.
756 static void acpiphp_check_bridge(struct acpiphp_bridge *bridge)
758 struct acpiphp_slot *slot;
760 list_for_each_entry(slot, &bridge->slots, node) {
761 struct pci_bus *bus = slot->bus;
762 struct pci_dev *dev, *tmp;
764 mutex_lock(&slot->crit_sect);
765 if (slot_no_hotplug(slot)) {
767 } else if (get_slot_status(slot) == ACPI_STA_ALL) {
768 /* remove stale devices if any */
769 list_for_each_entry_safe(dev, tmp, &bus->devices,
771 if (PCI_SLOT(dev->devfn) == slot->device)
772 trim_stale_devices(dev);
774 /* configure all functions */
779 mutex_unlock(&slot->crit_sect);
783 static void acpiphp_set_hpp_values(struct pci_bus *bus)
787 list_for_each_entry(dev, &bus->devices, bus_list)
788 pci_configure_slot(dev);
792 * Remove devices for which we could not assign resources, call
793 * arch specific code to fix-up the bus
795 static void acpiphp_sanitize_bus(struct pci_bus *bus)
797 struct pci_dev *dev, *tmp;
799 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM;
801 list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list) {
802 for (i=0; i<PCI_BRIDGE_RESOURCES; i++) {
803 struct resource *res = &dev->resource[i];
804 if ((res->flags & type_mask) && !res->start &&
806 /* Could not assign a required resources
807 * for this device, remove it */
808 pci_stop_and_remove_bus_device(dev);
816 * ACPI event handlers
819 void acpiphp_check_host_bridge(acpi_handle handle)
821 struct acpiphp_bridge *bridge;
823 bridge = acpiphp_handle_to_bridge(handle);
825 acpiphp_check_bridge(bridge);
830 static void hotplug_event(acpi_handle handle, u32 type, void *data)
832 struct acpiphp_context *context = data;
833 struct acpiphp_func *func = &context->func;
834 struct acpiphp_bridge *bridge;
836 struct acpi_buffer buffer = { .length = sizeof(objname),
837 .pointer = objname };
839 mutex_lock(&acpiphp_context_lock);
840 bridge = context->bridge;
844 mutex_unlock(&acpiphp_context_lock);
846 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
849 case ACPI_NOTIFY_BUS_CHECK:
850 /* bus re-enumerate */
851 pr_debug("%s: Bus check notify on %s\n", __func__, objname);
852 pr_debug("%s: re-enumerating slots under %s\n",
855 acpiphp_check_bridge(bridge);
857 struct acpiphp_slot *slot = func->slot;
859 mutex_lock(&slot->crit_sect);
861 mutex_unlock(&slot->crit_sect);
865 case ACPI_NOTIFY_DEVICE_CHECK:
867 pr_debug("%s: Device check notify on %s\n", __func__, objname);
869 acpiphp_check_bridge(bridge);
871 struct acpiphp_slot *slot = func->slot;
875 * Check if anything has changed in the slot and rescan
876 * from the parent if that's the case.
878 mutex_lock(&slot->crit_sect);
879 ret = acpiphp_rescan_slot(slot);
880 mutex_unlock(&slot->crit_sect);
882 acpiphp_check_bridge(func->parent);
886 case ACPI_NOTIFY_EJECT_REQUEST:
887 /* request device eject */
888 pr_debug("%s: Device eject notify on %s\n", __func__, objname);
889 acpiphp_disable_and_eject_slot(func->slot);
897 static void hotplug_event_work(void *data, u32 type)
899 struct acpiphp_context *context = data;
900 acpi_handle handle = context->handle;
902 acpi_scan_lock_acquire();
904 hotplug_event(handle, type, context);
906 acpi_scan_lock_release();
907 acpi_evaluate_hotplug_ost(handle, type, ACPI_OST_SC_SUCCESS, NULL);
908 put_bridge(context->func.parent);
912 * handle_hotplug_event - handle ACPI hotplug event
913 * @handle: Notify()'ed acpi_handle
915 * @data: pointer to acpiphp_context structure
917 * Handles ACPI event notification on slots.
919 static void handle_hotplug_event(acpi_handle handle, u32 type, void *data)
921 struct acpiphp_context *context;
922 u32 ost_code = ACPI_OST_SC_SUCCESS;
925 case ACPI_NOTIFY_BUS_CHECK:
926 case ACPI_NOTIFY_DEVICE_CHECK:
928 case ACPI_NOTIFY_EJECT_REQUEST:
929 ost_code = ACPI_OST_SC_EJECT_IN_PROGRESS;
930 acpi_evaluate_hotplug_ost(handle, type, ost_code, NULL);
933 case ACPI_NOTIFY_DEVICE_WAKE:
936 case ACPI_NOTIFY_FREQUENCY_MISMATCH:
937 acpi_handle_err(handle, "Device cannot be configured due "
938 "to a frequency mismatch\n");
941 case ACPI_NOTIFY_BUS_MODE_MISMATCH:
942 acpi_handle_err(handle, "Device cannot be configured due "
943 "to a bus mode mismatch\n");
946 case ACPI_NOTIFY_POWER_FAULT:
947 acpi_handle_err(handle, "Device has suffered a power fault\n");
951 acpi_handle_warn(handle, "Unsupported event type 0x%x\n", type);
952 ost_code = ACPI_OST_SC_UNRECOGNIZED_NOTIFY;
956 mutex_lock(&acpiphp_context_lock);
957 context = acpiphp_get_context(handle);
958 if (context && !WARN_ON(context->handle != handle)) {
959 get_bridge(context->func.parent);
960 acpiphp_put_context(context);
961 acpi_hotplug_execute(hotplug_event_work, context, type);
962 mutex_unlock(&acpiphp_context_lock);
965 mutex_unlock(&acpiphp_context_lock);
966 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
969 acpi_evaluate_hotplug_ost(handle, type, ost_code, NULL);
973 * Create hotplug slots for the PCI bus.
974 * It should always return 0 to avoid skipping following notifiers.
976 void acpiphp_enumerate_slots(struct pci_bus *bus)
978 struct acpiphp_bridge *bridge;
982 if (acpiphp_disabled)
985 handle = ACPI_HANDLE(bus->bridge);
989 bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
991 acpi_handle_err(handle, "No memory for bridge object\n");
995 INIT_LIST_HEAD(&bridge->slots);
996 kref_init(&bridge->ref);
997 bridge->pci_dev = pci_dev_get(bus->self);
998 bridge->pci_bus = bus;
1001 * Grab a ref to the subordinate PCI bus in case the bus is
1002 * removed via PCI core logical hotplug. The ref pins the bus
1003 * (which we access during module unload).
1005 get_device(&bus->dev);
1007 if (!pci_is_root_bus(bridge->pci_bus)) {
1008 struct acpiphp_context *context;
1011 * This bridge should have been registered as a hotplug function
1012 * under its parent, so the context should be there, unless the
1013 * parent is going to be handled by pciehp, in which case this
1014 * bridge is not interesting to us either.
1016 mutex_lock(&acpiphp_context_lock);
1017 context = acpiphp_get_context(handle);
1019 mutex_unlock(&acpiphp_context_lock);
1020 put_device(&bus->dev);
1021 pci_dev_put(bridge->pci_dev);
1025 bridge->context = context;
1026 context->bridge = bridge;
1027 /* Get a reference to the parent bridge. */
1028 get_bridge(context->func.parent);
1029 mutex_unlock(&acpiphp_context_lock);
1032 /* must be added to the list prior to calling register_slot */
1033 mutex_lock(&bridge_mutex);
1034 list_add(&bridge->list, &bridge_list);
1035 mutex_unlock(&bridge_mutex);
1037 /* register all slot objects under this bridge */
1038 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1,
1039 register_slot, NULL, bridge, NULL);
1040 if (ACPI_FAILURE(status)) {
1041 acpi_handle_err(handle, "failed to register slots\n");
1042 cleanup_bridge(bridge);
1047 /* Destroy hotplug slots associated with the PCI bus */
1048 void acpiphp_remove_slots(struct pci_bus *bus)
1050 struct acpiphp_bridge *bridge;
1052 if (acpiphp_disabled)
1055 mutex_lock(&bridge_mutex);
1056 list_for_each_entry(bridge, &bridge_list, list)
1057 if (bridge->pci_bus == bus) {
1058 mutex_unlock(&bridge_mutex);
1059 cleanup_bridge(bridge);
1064 mutex_unlock(&bridge_mutex);
1068 * acpiphp_enable_slot - power on slot
1069 * @slot: ACPI PHP slot
1071 int acpiphp_enable_slot(struct acpiphp_slot *slot)
1073 mutex_lock(&slot->crit_sect);
1074 /* configure all functions */
1075 if (!(slot->flags & SLOT_ENABLED))
1078 mutex_unlock(&slot->crit_sect);
1083 * acpiphp_disable_and_eject_slot - power off and eject slot
1084 * @slot: ACPI PHP slot
1086 int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot)
1088 struct acpiphp_func *func;
1091 mutex_lock(&slot->crit_sect);
1093 /* unconfigure all functions */
1096 list_for_each_entry(func, &slot->funcs, sibling)
1097 if (func->flags & FUNC_HAS_EJ0) {
1098 acpi_handle handle = func_to_handle(func);
1100 if (ACPI_FAILURE(acpi_evaluate_ej0(handle)))
1101 acpi_handle_err(handle, "_EJ0 failed\n");
1106 mutex_unlock(&slot->crit_sect);
1115 u8 acpiphp_get_power_status(struct acpiphp_slot *slot)
1117 return (slot->flags & SLOT_ENABLED);
1125 u8 acpiphp_get_latch_status(struct acpiphp_slot *slot)
1127 return !(get_slot_status(slot) & ACPI_STA_DEVICE_UI);
1132 * adapter presence : 1
1135 u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot)
1137 return !!get_slot_status(slot);