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/mutex.h>
50 #include <linux/slab.h>
51 #include <linux/acpi.h>
56 static LIST_HEAD(bridge_list);
57 static DEFINE_MUTEX(bridge_mutex);
59 #define MY_NAME "acpiphp_glue"
61 static void handle_hotplug_event_bridge (acpi_handle, u32, void *);
62 static void acpiphp_sanitize_bus(struct pci_bus *bus);
63 static void acpiphp_set_hpp_values(struct pci_bus *bus);
64 static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context);
65 static void free_bridge(struct kref *kref);
67 /* callback routine to check for the existence of a pci dock device */
69 is_pci_dock_device(acpi_handle handle, u32 lvl, void *context, void **rv)
71 int *count = (int *)context;
73 if (is_dock_device(handle)) {
75 return AE_CTRL_TERMINATE;
81 static inline void get_bridge(struct acpiphp_bridge *bridge)
83 kref_get(&bridge->ref);
86 static inline void put_bridge(struct acpiphp_bridge *bridge)
88 kref_put(&bridge->ref, free_bridge);
91 static void free_bridge(struct kref *kref)
93 struct acpiphp_bridge *bridge;
94 struct acpiphp_slot *slot, *next;
95 struct acpiphp_func *func, *tmp;
97 bridge = container_of(kref, struct acpiphp_bridge, ref);
99 list_for_each_entry_safe(slot, next, &bridge->slots, node) {
100 list_for_each_entry_safe(func, tmp, &slot->funcs, sibling) {
106 /* Release reference acquired by acpiphp_bridge_handle_to_function() */
107 if ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func)
108 put_bridge(bridge->func->slot->bridge);
109 put_device(&bridge->pci_bus->dev);
110 pci_dev_put(bridge->pci_dev);
115 * the _DCK method can do funny things... and sometimes not
118 * TBD - figure out a way to only call fixups for
119 * systems that require them.
121 static int post_dock_fixups(struct notifier_block *nb, unsigned long val,
124 struct acpiphp_func *func = container_of(nb, struct acpiphp_func, nb);
125 struct pci_bus *bus = func->slot->bridge->pci_bus;
131 /* fixup bad _DCK function that rewrites
132 * secondary bridge on slot
134 pci_read_config_dword(bus->self,
138 if (((buses >> 8) & 0xff) != bus->busn_res.start) {
139 buses = (buses & 0xff000000)
140 | ((unsigned int)(bus->primary) << 0)
141 | ((unsigned int)(bus->busn_res.start) << 8)
142 | ((unsigned int)(bus->busn_res.end) << 16);
143 pci_write_config_dword(bus->self, PCI_PRIMARY_BUS, buses);
149 static const struct acpi_dock_ops acpiphp_dock_ops = {
150 .handler = handle_hotplug_event_func,
153 /* Check whether the PCI device is managed by native PCIe hotplug driver */
154 static bool device_is_managed_by_native_pciehp(struct pci_dev *pdev)
158 struct acpi_pci_root *root;
160 /* Check whether the PCIe port supports native PCIe hotplug */
161 if (pcie_capability_read_dword(pdev, PCI_EXP_SLTCAP, ®32))
163 if (!(reg32 & PCI_EXP_SLTCAP_HPC))
167 * Check whether native PCIe hotplug has been enabled for
168 * this PCIe hierarchy.
170 tmp = acpi_find_root_bridge_handle(pdev);
173 root = acpi_pci_find_root(tmp);
176 if (!(root->osc_control_set & OSC_PCI_EXPRESS_NATIVE_HP_CONTROL))
182 /* callback routine to register each ACPI PCI slot object */
184 register_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
186 struct acpiphp_bridge *bridge = (struct acpiphp_bridge *)context;
187 struct acpiphp_slot *slot;
188 struct acpiphp_func *newfunc;
190 acpi_status status = AE_OK;
191 unsigned long long adr, sun;
192 int device, function, retval, found = 0;
193 struct pci_bus *pbus = bridge->pci_bus;
194 struct pci_dev *pdev;
197 if (!acpi_pci_check_ejectable(pbus, handle) && !is_dock_device(handle))
200 status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr);
201 if (ACPI_FAILURE(status)) {
202 warn("can't evaluate _ADR (%#x)\n", status);
206 device = (adr >> 16) & 0xffff;
207 function = adr & 0xffff;
209 pdev = bridge->pci_dev;
210 if (pdev && device_is_managed_by_native_pciehp(pdev))
213 newfunc = kzalloc(sizeof(struct acpiphp_func), GFP_KERNEL);
217 newfunc->handle = handle;
218 newfunc->function = function;
220 if (ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp)))
221 newfunc->flags = FUNC_HAS_EJ0;
223 if (ACPI_SUCCESS(acpi_get_handle(handle, "_STA", &tmp)))
224 newfunc->flags |= FUNC_HAS_STA;
226 if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS0", &tmp)))
227 newfunc->flags |= FUNC_HAS_PS0;
229 if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS3", &tmp)))
230 newfunc->flags |= FUNC_HAS_PS3;
232 if (ACPI_SUCCESS(acpi_get_handle(handle, "_DCK", &tmp)))
233 newfunc->flags |= FUNC_HAS_DCK;
235 status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun);
236 if (ACPI_FAILURE(status)) {
238 * use the count of the number of slots we've found
239 * for the number of the slot
241 sun = bridge->nr_slots+1;
244 /* search for objects that share the same slot */
245 list_for_each_entry(slot, &bridge->slots, node)
246 if (slot->device == device) {
247 if (slot->sun != sun)
248 warn("sibling found, but _SUN doesn't match!\n");
254 slot = kzalloc(sizeof(struct acpiphp_slot), GFP_KERNEL);
260 slot->bridge = bridge;
261 slot->device = device;
263 INIT_LIST_HEAD(&slot->funcs);
264 mutex_init(&slot->crit_sect);
266 mutex_lock(&bridge_mutex);
267 list_add_tail(&slot->node, &bridge->slots);
268 mutex_unlock(&bridge_mutex);
271 dbg("found ACPI PCI Hotplug slot %llu at PCI %04x:%02x:%02x\n",
272 slot->sun, pci_domain_nr(pbus), pbus->number, device);
273 retval = acpiphp_register_hotplug_slot(slot);
275 if (retval == -EBUSY)
276 warn("Slot %llu already registered by another "
277 "hotplug driver\n", slot->sun);
279 warn("acpiphp_register_hotplug_slot failed "
280 "(err code = 0x%x)\n", retval);
285 newfunc->slot = slot;
286 mutex_lock(&bridge_mutex);
287 list_add_tail(&newfunc->sibling, &slot->funcs);
288 mutex_unlock(&bridge_mutex);
290 if (pci_bus_read_dev_vendor_id(pbus, PCI_DEVFN(device, function),
292 slot->flags |= (SLOT_ENABLED | SLOT_POWEREDON);
294 if (is_dock_device(handle)) {
295 /* we don't want to call this device's _EJ0
296 * because we want the dock notify handler
297 * to call it after it calls _DCK
299 newfunc->flags &= ~FUNC_HAS_EJ0;
300 if (register_hotplug_dock_device(handle,
301 &acpiphp_dock_ops, newfunc))
302 dbg("failed to register dock device\n");
304 /* we need to be notified when dock events happen
305 * outside of the hotplug operation, since we may
306 * need to do fixups before we can hotplug.
308 newfunc->nb.notifier_call = post_dock_fixups;
309 if (register_dock_notifier(&newfunc->nb))
310 dbg("failed to register a dock notifier");
313 /* install notify handler */
314 if (!(newfunc->flags & FUNC_HAS_DCK)) {
315 status = acpi_install_notify_handler(handle,
317 handle_hotplug_event_func,
320 if (ACPI_FAILURE(status))
321 err("failed to register interrupt notify handler\n");
329 mutex_lock(&bridge_mutex);
330 list_del(&slot->node);
331 mutex_unlock(&bridge_mutex);
339 /* see if it's worth looking at this bridge */
340 static int detect_ejectable_slots(acpi_handle handle)
342 int found = acpi_pci_detect_ejectable(handle);
344 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
345 is_pci_dock_device, NULL, (void *)&found, NULL);
350 /* initialize miscellaneous stuff for both root and PCI-to-PCI bridge */
351 static void init_bridge_misc(struct acpiphp_bridge *bridge)
355 /* must be added to the list prior to calling register_slot */
356 mutex_lock(&bridge_mutex);
357 list_add(&bridge->list, &bridge_list);
358 mutex_unlock(&bridge_mutex);
360 /* register all slot objects under this bridge */
361 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge->handle, (u32)1,
362 register_slot, NULL, bridge, NULL);
363 if (ACPI_FAILURE(status)) {
364 mutex_lock(&bridge_mutex);
365 list_del(&bridge->list);
366 mutex_unlock(&bridge_mutex);
370 /* install notify handler for P2P bridges */
371 if (!pci_is_root_bus(bridge->pci_bus)) {
372 if ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func) {
373 status = acpi_remove_notify_handler(bridge->func->handle,
375 handle_hotplug_event_func);
376 if (ACPI_FAILURE(status))
377 err("failed to remove notify handler\n");
379 status = acpi_install_notify_handler(bridge->handle,
381 handle_hotplug_event_bridge,
384 if (ACPI_FAILURE(status)) {
385 err("failed to register interrupt notify handler\n");
391 /* find acpiphp_func from acpiphp_bridge */
392 static struct acpiphp_func *acpiphp_bridge_handle_to_function(acpi_handle handle)
394 struct acpiphp_bridge *bridge;
395 struct acpiphp_slot *slot;
396 struct acpiphp_func *func = NULL;
398 mutex_lock(&bridge_mutex);
399 list_for_each_entry(bridge, &bridge_list, list) {
400 list_for_each_entry(slot, &bridge->slots, node) {
401 list_for_each_entry(func, &slot->funcs, sibling) {
402 if (func->handle == handle) {
403 get_bridge(func->slot->bridge);
404 mutex_unlock(&bridge_mutex);
410 mutex_unlock(&bridge_mutex);
416 static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle)
418 struct acpiphp_bridge *bridge;
420 mutex_lock(&bridge_mutex);
421 list_for_each_entry(bridge, &bridge_list, list)
422 if (bridge->handle == handle) {
424 mutex_unlock(&bridge_mutex);
427 mutex_unlock(&bridge_mutex);
432 static void cleanup_bridge(struct acpiphp_bridge *bridge)
434 struct acpiphp_slot *slot;
435 struct acpiphp_func *func;
437 acpi_handle handle = bridge->handle;
439 if (!pci_is_root_bus(bridge->pci_bus)) {
440 status = acpi_remove_notify_handler(handle,
442 handle_hotplug_event_bridge);
443 if (ACPI_FAILURE(status))
444 err("failed to remove notify handler\n");
447 if ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func) {
448 status = acpi_install_notify_handler(bridge->func->handle,
450 handle_hotplug_event_func,
452 if (ACPI_FAILURE(status))
453 err("failed to install interrupt notify handler\n");
456 list_for_each_entry(slot, &bridge->slots, node) {
457 list_for_each_entry(func, &slot->funcs, sibling) {
458 if (is_dock_device(func->handle)) {
459 unregister_hotplug_dock_device(func->handle);
460 unregister_dock_notifier(&func->nb);
462 if (!(func->flags & FUNC_HAS_DCK)) {
463 status = acpi_remove_notify_handler(func->handle,
465 handle_hotplug_event_func);
466 if (ACPI_FAILURE(status))
467 err("failed to remove notify handler\n");
470 acpiphp_unregister_hotplug_slot(slot);
473 mutex_lock(&bridge_mutex);
474 list_del(&bridge->list);
475 mutex_unlock(&bridge_mutex);
478 static int power_on_slot(struct acpiphp_slot *slot)
481 struct acpiphp_func *func;
484 /* if already enabled, just skip */
485 if (slot->flags & SLOT_POWEREDON)
488 list_for_each_entry(func, &slot->funcs, sibling) {
489 if (func->flags & FUNC_HAS_PS0) {
490 dbg("%s: executing _PS0\n", __func__);
491 status = acpi_evaluate_object(func->handle, "_PS0", NULL, NULL);
492 if (ACPI_FAILURE(status)) {
493 warn("%s: _PS0 failed\n", __func__);
501 /* TBD: evaluate _STA to check if the slot is enabled */
503 slot->flags |= SLOT_POWEREDON;
510 static int power_off_slot(struct acpiphp_slot *slot)
513 struct acpiphp_func *func;
517 /* if already disabled, just skip */
518 if ((slot->flags & SLOT_POWEREDON) == 0)
521 list_for_each_entry(func, &slot->funcs, sibling) {
522 if (func->flags & FUNC_HAS_PS3) {
523 status = acpi_evaluate_object(func->handle, "_PS3", NULL, NULL);
524 if (ACPI_FAILURE(status)) {
525 warn("%s: _PS3 failed\n", __func__);
533 /* TBD: evaluate _STA to check if the slot is disabled */
535 slot->flags &= (~SLOT_POWEREDON);
544 * acpiphp_max_busnr - return the highest reserved bus number under the given bus.
545 * @bus: bus to start search with
547 static unsigned char acpiphp_max_busnr(struct pci_bus *bus)
549 struct list_head *tmp;
550 unsigned char max, n;
553 * pci_bus_max_busnr will return the highest
554 * reserved busnr for all these children.
555 * that is equivalent to the bus->subordinate
556 * value. We don't want to use the parent's
557 * bus->subordinate value because it could have
560 max = bus->busn_res.start;
562 list_for_each(tmp, &bus->children) {
563 n = pci_bus_max_busnr(pci_bus_b(tmp));
572 * acpiphp_bus_add - add a new bus to acpi subsystem
573 * @func: acpiphp_func of the bridge
575 static int acpiphp_bus_add(struct acpiphp_func *func)
577 struct acpi_device *device;
580 if (!acpi_bus_get_device(func->handle, &device)) {
581 dbg("bus exists... trim\n");
582 /* this shouldn't be in here, so remove
583 * the bus then re-add it...
585 acpi_bus_trim(device);
588 ret_val = acpi_bus_scan(func->handle);
590 ret_val = acpi_bus_get_device(func->handle, &device);
593 dbg("error adding bus, %x\n", -ret_val);
600 * acpiphp_bus_trim - trim a bus from acpi subsystem
601 * @handle: handle to acpi namespace
603 static int acpiphp_bus_trim(acpi_handle handle)
605 struct acpi_device *device;
608 retval = acpi_bus_get_device(handle, &device);
610 dbg("acpi_device not found\n");
614 acpi_bus_trim(device);
618 static void acpiphp_set_acpi_region(struct acpiphp_slot *slot)
620 struct acpiphp_func *func;
621 union acpi_object params[2];
622 struct acpi_object_list arg_list;
624 list_for_each_entry(func, &slot->funcs, sibling) {
626 arg_list.pointer = params;
627 params[0].type = ACPI_TYPE_INTEGER;
628 params[0].integer.value = ACPI_ADR_SPACE_PCI_CONFIG;
629 params[1].type = ACPI_TYPE_INTEGER;
630 params[1].integer.value = 1;
631 /* _REG is optional, we don't care about if there is failure */
632 acpi_evaluate_object(func->handle, "_REG", &arg_list, NULL);
636 static void check_hotplug_bridge(struct acpiphp_slot *slot, struct pci_dev *dev)
638 struct acpiphp_func *func;
640 if (!dev->subordinate)
643 /* quirk, or pcie could set it already */
644 if (dev->is_hotplug_bridge)
647 if (PCI_SLOT(dev->devfn) != slot->device)
650 list_for_each_entry(func, &slot->funcs, sibling) {
651 if (PCI_FUNC(dev->devfn) == func->function) {
652 /* check if this bridge has ejectable slots */
653 if ((detect_ejectable_slots(func->handle) > 0))
654 dev->is_hotplug_bridge = 1;
661 * enable_device - enable, configure a slot
662 * @slot: slot to be enabled
664 * This function should be called per *physical slot*,
665 * not per each slot object in ACPI namespace.
667 static int __ref enable_device(struct acpiphp_slot *slot)
670 struct pci_bus *bus = slot->bridge->pci_bus;
671 struct acpiphp_func *func;
674 if (slot->flags & SLOT_ENABLED)
677 list_for_each_entry(func, &slot->funcs, sibling)
678 acpiphp_bus_add(func);
680 num = pci_scan_slot(bus, PCI_DEVFN(slot->device, 0));
682 /* Maybe only part of funcs are added. */
683 dbg("No new device found\n");
687 max = acpiphp_max_busnr(bus);
688 for (pass = 0; pass < 2; pass++) {
689 list_for_each_entry(dev, &bus->devices, bus_list) {
690 if (PCI_SLOT(dev->devfn) != slot->device)
692 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
693 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
694 max = pci_scan_bridge(bus, dev, max, pass);
695 if (pass && dev->subordinate) {
696 check_hotplug_bridge(slot, dev);
697 pci_bus_size_bridges(dev->subordinate);
703 pci_bus_assign_resources(bus);
704 acpiphp_sanitize_bus(bus);
705 acpiphp_set_hpp_values(bus);
706 acpiphp_set_acpi_region(slot);
707 pci_enable_bridges(bus);
709 list_for_each_entry(dev, &bus->devices, bus_list) {
710 /* Assume that newly added devices are powered on already. */
712 dev->current_state = PCI_D0;
715 pci_bus_add_devices(bus);
717 slot->flags |= SLOT_ENABLED;
718 list_for_each_entry(func, &slot->funcs, sibling) {
719 dev = pci_get_slot(bus, PCI_DEVFN(slot->device,
722 /* Do not set SLOT_ENABLED flag if some funcs
724 slot->flags &= (~SLOT_ENABLED);
734 /* return first device in slot, acquiring a reference on it */
735 static struct pci_dev *dev_in_slot(struct acpiphp_slot *slot)
737 struct pci_bus *bus = slot->bridge->pci_bus;
739 struct pci_dev *ret = NULL;
741 down_read(&pci_bus_sem);
742 list_for_each_entry(dev, &bus->devices, bus_list)
743 if (PCI_SLOT(dev->devfn) == slot->device) {
744 ret = pci_dev_get(dev);
747 up_read(&pci_bus_sem);
753 * disable_device - disable a slot
754 * @slot: ACPI PHP slot
756 static int disable_device(struct acpiphp_slot *slot)
758 struct acpiphp_func *func;
759 struct pci_dev *pdev;
762 * enable_device() enumerates all functions in this device via
763 * pci_scan_slot(), whether they have associated ACPI hotplug
764 * methods (_EJ0, etc.) or not. Therefore, we remove all functions
767 while ((pdev = dev_in_slot(slot))) {
768 pci_stop_and_remove_bus_device(pdev);
772 list_for_each_entry(func, &slot->funcs, sibling) {
773 acpiphp_bus_trim(func->handle);
776 slot->flags &= (~SLOT_ENABLED);
783 * get_slot_status - get ACPI slot status
784 * @slot: ACPI PHP slot
786 * If a slot has _STA for each function and if any one of them
787 * returned non-zero status, return it.
789 * If a slot doesn't have _STA and if any one of its functions'
790 * configuration space is configured, return 0x0f as a _STA.
792 * Otherwise return 0.
794 static unsigned int get_slot_status(struct acpiphp_slot *slot)
797 unsigned long long sta = 0;
799 struct acpiphp_func *func;
801 list_for_each_entry(func, &slot->funcs, sibling) {
802 if (func->flags & FUNC_HAS_STA) {
803 status = acpi_evaluate_integer(func->handle, "_STA", NULL, &sta);
804 if (ACPI_SUCCESS(status) && sta)
807 pci_bus_read_config_dword(slot->bridge->pci_bus,
808 PCI_DEVFN(slot->device,
810 PCI_VENDOR_ID, &dvid);
811 if (dvid != 0xffffffff) {
818 return (unsigned int)sta;
822 * acpiphp_eject_slot - physically eject the slot
823 * @slot: ACPI PHP slot
825 int acpiphp_eject_slot(struct acpiphp_slot *slot)
828 struct acpiphp_func *func;
829 struct acpi_object_list arg_list;
830 union acpi_object arg;
832 list_for_each_entry(func, &slot->funcs, sibling) {
833 /* We don't want to call _EJ0 on non-existing functions. */
834 if ((func->flags & FUNC_HAS_EJ0)) {
835 /* _EJ0 method take one argument */
837 arg_list.pointer = &arg;
838 arg.type = ACPI_TYPE_INTEGER;
839 arg.integer.value = 1;
841 status = acpi_evaluate_object(func->handle, "_EJ0", &arg_list, NULL);
842 if (ACPI_FAILURE(status)) {
843 warn("%s: _EJ0 failed\n", __func__);
853 * acpiphp_check_bridge - re-enumerate devices
854 * @bridge: where to begin re-enumeration
856 * Iterate over all slots under this bridge and make sure that if a
857 * card is present they are enabled, and if not they are disabled.
859 static int acpiphp_check_bridge(struct acpiphp_bridge *bridge)
861 struct acpiphp_slot *slot;
863 int enabled, disabled;
865 enabled = disabled = 0;
867 list_for_each_entry(slot, &bridge->slots, node) {
868 unsigned int status = get_slot_status(slot);
869 if (slot->flags & SLOT_ENABLED) {
870 if (status == ACPI_STA_ALL)
872 retval = acpiphp_disable_slot(slot);
874 err("Error occurred in disabling\n");
877 acpiphp_eject_slot(slot);
881 if (status != ACPI_STA_ALL)
883 retval = acpiphp_enable_slot(slot);
885 err("Error occurred in enabling\n");
892 dbg("%s: %d enabled, %d disabled\n", __func__, enabled, disabled);
898 static void acpiphp_set_hpp_values(struct pci_bus *bus)
902 list_for_each_entry(dev, &bus->devices, bus_list)
903 pci_configure_slot(dev);
907 * Remove devices for which we could not assign resources, call
908 * arch specific code to fix-up the bus
910 static void acpiphp_sanitize_bus(struct pci_bus *bus)
912 struct pci_dev *dev, *tmp;
914 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM;
916 list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list) {
917 for (i=0; i<PCI_BRIDGE_RESOURCES; i++) {
918 struct resource *res = &dev->resource[i];
919 if ((res->flags & type_mask) && !res->start &&
921 /* Could not assign a required resources
922 * for this device, remove it */
923 pci_stop_and_remove_bus_device(dev);
931 * ACPI event handlers
935 check_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
937 struct acpiphp_bridge *bridge;
939 struct acpi_buffer buffer = { .length = sizeof(objname),
940 .pointer = objname };
942 bridge = acpiphp_handle_to_bridge(handle);
944 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
945 dbg("%s: re-enumerating slots under %s\n",
947 acpiphp_check_bridge(bridge);
953 void acpiphp_check_host_bridge(acpi_handle handle)
955 struct acpiphp_bridge *bridge;
957 bridge = acpiphp_handle_to_bridge(handle);
959 acpiphp_check_bridge(bridge);
963 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
964 ACPI_UINT32_MAX, check_sub_bridges, NULL, NULL, NULL);
967 static void _handle_hotplug_event_bridge(struct work_struct *work)
969 struct acpiphp_bridge *bridge;
971 struct acpi_buffer buffer = { .length = sizeof(objname),
972 .pointer = objname };
973 struct acpi_hp_work *hp_work;
977 hp_work = container_of(work, struct acpi_hp_work, work);
978 handle = hp_work->handle;
979 type = hp_work->type;
980 bridge = (struct acpiphp_bridge *)hp_work->context;
982 acpi_scan_lock_acquire();
984 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
987 case ACPI_NOTIFY_BUS_CHECK:
988 /* bus re-enumerate */
989 dbg("%s: Bus check notify on %s\n", __func__, objname);
990 dbg("%s: re-enumerating slots under %s\n", __func__, objname);
991 acpiphp_check_bridge(bridge);
992 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
993 ACPI_UINT32_MAX, check_sub_bridges, NULL, NULL, NULL);
996 case ACPI_NOTIFY_DEVICE_CHECK:
998 dbg("%s: Device check notify on %s\n", __func__, objname);
999 acpiphp_check_bridge(bridge);
1002 case ACPI_NOTIFY_DEVICE_WAKE:
1004 dbg("%s: Device wake notify on %s\n", __func__, objname);
1007 case ACPI_NOTIFY_EJECT_REQUEST:
1008 /* request device eject */
1009 dbg("%s: Device eject notify on %s\n", __func__, objname);
1010 if ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func) {
1011 struct acpiphp_slot *slot;
1012 slot = bridge->func->slot;
1013 if (!acpiphp_disable_slot(slot))
1014 acpiphp_eject_slot(slot);
1018 case ACPI_NOTIFY_FREQUENCY_MISMATCH:
1019 printk(KERN_ERR "Device %s cannot be configured due"
1020 " to a frequency mismatch\n", objname);
1023 case ACPI_NOTIFY_BUS_MODE_MISMATCH:
1024 printk(KERN_ERR "Device %s cannot be configured due"
1025 " to a bus mode mismatch\n", objname);
1028 case ACPI_NOTIFY_POWER_FAULT:
1029 printk(KERN_ERR "Device %s has suffered a power fault\n",
1034 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
1038 acpi_scan_lock_release();
1039 kfree(hp_work); /* allocated in handle_hotplug_event_bridge */
1044 * handle_hotplug_event_bridge - handle ACPI event on bridges
1045 * @handle: Notify()'ed acpi_handle
1046 * @type: Notify code
1047 * @context: pointer to acpiphp_bridge structure
1049 * Handles ACPI event notification on {host,p2p} bridges.
1051 static void handle_hotplug_event_bridge(acpi_handle handle, u32 type,
1054 struct acpiphp_bridge *bridge = context;
1057 * Currently the code adds all hotplug events to the kacpid_wq
1058 * queue when it should add hotplug events to the kacpi_hotplug_wq.
1059 * The proper way to fix this is to reorganize the code so that
1060 * drivers (dock, etc.) do not call acpi_os_execute(), etc.
1061 * For now just re-add this work to the kacpi_hotplug_wq so we
1062 * don't deadlock on hotplug actions.
1065 alloc_acpi_hp_work(handle, type, context, _handle_hotplug_event_bridge);
1068 static void _handle_hotplug_event_func(struct work_struct *work)
1070 struct acpiphp_func *func;
1072 struct acpi_buffer buffer = { .length = sizeof(objname),
1073 .pointer = objname };
1074 struct acpi_hp_work *hp_work;
1078 hp_work = container_of(work, struct acpi_hp_work, work);
1079 handle = hp_work->handle;
1080 type = hp_work->type;
1081 func = (struct acpiphp_func *)hp_work->context;
1083 acpi_scan_lock_acquire();
1085 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1088 case ACPI_NOTIFY_BUS_CHECK:
1089 /* bus re-enumerate */
1090 dbg("%s: Bus check notify on %s\n", __func__, objname);
1091 acpiphp_enable_slot(func->slot);
1094 case ACPI_NOTIFY_DEVICE_CHECK:
1095 /* device check : re-enumerate from parent bus */
1096 dbg("%s: Device check notify on %s\n", __func__, objname);
1097 acpiphp_check_bridge(func->slot->bridge);
1100 case ACPI_NOTIFY_DEVICE_WAKE:
1102 dbg("%s: Device wake notify on %s\n", __func__, objname);
1105 case ACPI_NOTIFY_EJECT_REQUEST:
1106 /* request device eject */
1107 dbg("%s: Device eject notify on %s\n", __func__, objname);
1108 if (!(acpiphp_disable_slot(func->slot)))
1109 acpiphp_eject_slot(func->slot);
1113 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
1117 acpi_scan_lock_release();
1118 kfree(hp_work); /* allocated in handle_hotplug_event_func */
1119 put_bridge(func->slot->bridge);
1123 * handle_hotplug_event_func - handle ACPI event on functions (i.e. slots)
1124 * @handle: Notify()'ed acpi_handle
1125 * @type: Notify code
1126 * @context: pointer to acpiphp_func structure
1128 * Handles ACPI event notification on slots.
1130 static void handle_hotplug_event_func(acpi_handle handle, u32 type,
1133 struct acpiphp_func *func = context;
1136 * Currently the code adds all hotplug events to the kacpid_wq
1137 * queue when it should add hotplug events to the kacpi_hotplug_wq.
1138 * The proper way to fix this is to reorganize the code so that
1139 * drivers (dock, etc.) do not call acpi_os_execute(), etc.
1140 * For now just re-add this work to the kacpi_hotplug_wq so we
1141 * don't deadlock on hotplug actions.
1143 get_bridge(func->slot->bridge);
1144 alloc_acpi_hp_work(handle, type, context, _handle_hotplug_event_func);
1148 * Create hotplug slots for the PCI bus.
1149 * It should always return 0 to avoid skipping following notifiers.
1151 void acpiphp_enumerate_slots(struct pci_bus *bus, acpi_handle handle)
1153 acpi_handle dummy_handle;
1154 struct acpiphp_bridge *bridge;
1156 if (acpiphp_disabled)
1159 if (detect_ejectable_slots(handle) <= 0)
1162 bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
1163 if (bridge == NULL) {
1164 err("out of memory\n");
1168 INIT_LIST_HEAD(&bridge->slots);
1169 kref_init(&bridge->ref);
1170 bridge->handle = handle;
1171 bridge->pci_dev = pci_dev_get(bus->self);
1172 bridge->pci_bus = bus;
1175 * Grab a ref to the subordinate PCI bus in case the bus is
1176 * removed via PCI core logical hotplug. The ref pins the bus
1177 * (which we access during module unload).
1179 get_device(&bus->dev);
1181 if (!pci_is_root_bus(bridge->pci_bus) &&
1182 ACPI_SUCCESS(acpi_get_handle(bridge->handle,
1183 "_EJ0", &dummy_handle))) {
1184 dbg("found ejectable p2p bridge\n");
1185 bridge->flags |= BRIDGE_HAS_EJ0;
1186 bridge->func = acpiphp_bridge_handle_to_function(handle);
1189 init_bridge_misc(bridge);
1192 /* Destroy hotplug slots associated with the PCI bus */
1193 void acpiphp_remove_slots(struct pci_bus *bus)
1195 struct acpiphp_bridge *bridge, *tmp;
1197 if (acpiphp_disabled)
1200 list_for_each_entry_safe(bridge, tmp, &bridge_list, list)
1201 if (bridge->pci_bus == bus) {
1202 cleanup_bridge(bridge);
1209 * acpiphp_enable_slot - power on slot
1210 * @slot: ACPI PHP slot
1212 int acpiphp_enable_slot(struct acpiphp_slot *slot)
1216 mutex_lock(&slot->crit_sect);
1218 /* wake up all functions */
1219 retval = power_on_slot(slot);
1223 if (get_slot_status(slot) == ACPI_STA_ALL) {
1224 /* configure all functions */
1225 retval = enable_device(slot);
1227 power_off_slot(slot);
1229 dbg("%s: Slot status is not ACPI_STA_ALL\n", __func__);
1230 power_off_slot(slot);
1234 mutex_unlock(&slot->crit_sect);
1239 * acpiphp_disable_slot - power off slot
1240 * @slot: ACPI PHP slot
1242 int acpiphp_disable_slot(struct acpiphp_slot *slot)
1246 mutex_lock(&slot->crit_sect);
1248 /* unconfigure all functions */
1249 retval = disable_device(slot);
1253 /* power off all functions */
1254 retval = power_off_slot(slot);
1259 mutex_unlock(&slot->crit_sect);
1268 u8 acpiphp_get_power_status(struct acpiphp_slot *slot)
1270 return (slot->flags & SLOT_POWEREDON);
1278 u8 acpiphp_get_latch_status(struct acpiphp_slot *slot)
1282 sta = get_slot_status(slot);
1284 return (sta & ACPI_STA_DEVICE_UI) ? 0 : 1;
1289 * adapter presence : 1
1292 u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot)
1296 sta = get_slot_status(slot);
1298 return (sta == 0) ? 0 : 1;