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>
55 static LIST_HEAD(bridge_list);
57 #define MY_NAME "acpiphp_glue"
59 static void handle_hotplug_event_bridge (acpi_handle, u32, void *);
60 static void acpiphp_sanitize_bus(struct pci_bus *bus);
61 static void acpiphp_set_hpp_values(struct pci_bus *bus);
62 static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context);
64 /* callback routine to check for the existence of a pci dock device */
66 is_pci_dock_device(acpi_handle handle, u32 lvl, void *context, void **rv)
68 int *count = (int *)context;
70 if (is_dock_device(handle)) {
72 return AE_CTRL_TERMINATE;
79 * the _DCK method can do funny things... and sometimes not
82 * TBD - figure out a way to only call fixups for
83 * systems that require them.
85 static int post_dock_fixups(struct notifier_block *nb, unsigned long val,
88 struct acpiphp_func *func = container_of(nb, struct acpiphp_func, nb);
89 struct pci_bus *bus = func->slot->bridge->pci_bus;
95 /* fixup bad _DCK function that rewrites
96 * secondary bridge on slot
98 pci_read_config_dword(bus->self,
102 if (((buses >> 8) & 0xff) != bus->secondary) {
103 buses = (buses & 0xff000000)
104 | ((unsigned int)(bus->primary) << 0)
105 | ((unsigned int)(bus->secondary) << 8)
106 | ((unsigned int)(bus->subordinate) << 16);
107 pci_write_config_dword(bus->self, PCI_PRIMARY_BUS, buses);
113 static struct acpi_dock_ops acpiphp_dock_ops = {
114 .handler = handle_hotplug_event_func,
117 /* callback routine to register each ACPI PCI slot object */
119 register_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
121 struct acpiphp_bridge *bridge = (struct acpiphp_bridge *)context;
122 struct acpiphp_slot *slot;
123 struct acpiphp_func *newfunc;
125 acpi_status status = AE_OK;
126 unsigned long long adr, sun;
127 int device, function, retval;
128 struct pci_bus *pbus = bridge->pci_bus;
129 struct pci_dev *pdev;
131 if (!acpi_pci_check_ejectable(pbus, handle) && !is_dock_device(handle))
134 acpi_evaluate_integer(handle, "_ADR", NULL, &adr);
135 device = (adr >> 16) & 0xffff;
136 function = adr & 0xffff;
138 newfunc = kzalloc(sizeof(struct acpiphp_func), GFP_KERNEL);
142 INIT_LIST_HEAD(&newfunc->sibling);
143 newfunc->handle = handle;
144 newfunc->function = function;
146 if (ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp)))
147 newfunc->flags = FUNC_HAS_EJ0;
149 if (ACPI_SUCCESS(acpi_get_handle(handle, "_STA", &tmp)))
150 newfunc->flags |= FUNC_HAS_STA;
152 if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS0", &tmp)))
153 newfunc->flags |= FUNC_HAS_PS0;
155 if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS3", &tmp)))
156 newfunc->flags |= FUNC_HAS_PS3;
158 if (ACPI_SUCCESS(acpi_get_handle(handle, "_DCK", &tmp)))
159 newfunc->flags |= FUNC_HAS_DCK;
161 status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun);
162 if (ACPI_FAILURE(status)) {
164 * use the count of the number of slots we've found
165 * for the number of the slot
167 sun = bridge->nr_slots+1;
170 /* search for objects that share the same slot */
171 for (slot = bridge->slots; slot; slot = slot->next)
172 if (slot->device == device) {
173 if (slot->sun != sun)
174 warn("sibling found, but _SUN doesn't match!\n");
179 slot = kzalloc(sizeof(struct acpiphp_slot), GFP_KERNEL);
185 slot->bridge = bridge;
186 slot->device = device;
188 INIT_LIST_HEAD(&slot->funcs);
189 mutex_init(&slot->crit_sect);
191 slot->next = bridge->slots;
192 bridge->slots = slot;
196 dbg("found ACPI PCI Hotplug slot %llu at PCI %04x:%02x:%02x\n",
197 slot->sun, pci_domain_nr(pbus), pbus->number, device);
198 retval = acpiphp_register_hotplug_slot(slot);
200 if (retval == -EBUSY)
201 warn("Slot %llu already registered by another "
202 "hotplug driver\n", slot->sun);
204 warn("acpiphp_register_hotplug_slot failed "
205 "(err code = 0x%x)\n", retval);
210 newfunc->slot = slot;
211 list_add_tail(&newfunc->sibling, &slot->funcs);
213 pdev = pci_get_slot(pbus, PCI_DEVFN(device, function));
215 slot->flags |= (SLOT_ENABLED | SLOT_POWEREDON);
219 if (is_dock_device(handle)) {
220 /* we don't want to call this device's _EJ0
221 * because we want the dock notify handler
222 * to call it after it calls _DCK
224 newfunc->flags &= ~FUNC_HAS_EJ0;
225 if (register_hotplug_dock_device(handle,
226 &acpiphp_dock_ops, newfunc))
227 dbg("failed to register dock device\n");
229 /* we need to be notified when dock events happen
230 * outside of the hotplug operation, since we may
231 * need to do fixups before we can hotplug.
233 newfunc->nb.notifier_call = post_dock_fixups;
234 if (register_dock_notifier(&newfunc->nb))
235 dbg("failed to register a dock notifier");
238 /* install notify handler */
239 if (!(newfunc->flags & FUNC_HAS_DCK)) {
240 status = acpi_install_notify_handler(handle,
242 handle_hotplug_event_func,
245 if (ACPI_FAILURE(status))
246 err("failed to register interrupt notify handler\n");
254 bridge->slots = slot->next;
262 /* see if it's worth looking at this bridge */
263 static int detect_ejectable_slots(acpi_handle handle)
265 int found = acpi_pci_detect_ejectable(handle);
267 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
268 is_pci_dock_device, NULL, (void *)&found, NULL);
273 /* initialize miscellaneous stuff for both root and PCI-to-PCI bridge */
274 static void init_bridge_misc(struct acpiphp_bridge *bridge)
278 /* must be added to the list prior to calling register_slot */
279 list_add(&bridge->list, &bridge_list);
281 /* register all slot objects under this bridge */
282 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge->handle, (u32)1,
283 register_slot, NULL, bridge, NULL);
284 if (ACPI_FAILURE(status)) {
285 list_del(&bridge->list);
289 /* install notify handler */
290 if (bridge->type != BRIDGE_TYPE_HOST) {
291 if ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func) {
292 status = acpi_remove_notify_handler(bridge->func->handle,
294 handle_hotplug_event_func);
295 if (ACPI_FAILURE(status))
296 err("failed to remove notify handler\n");
298 status = acpi_install_notify_handler(bridge->handle,
300 handle_hotplug_event_bridge,
303 if (ACPI_FAILURE(status)) {
304 err("failed to register interrupt notify handler\n");
310 /* find acpiphp_func from acpiphp_bridge */
311 static struct acpiphp_func *acpiphp_bridge_handle_to_function(acpi_handle handle)
313 struct acpiphp_bridge *bridge;
314 struct acpiphp_slot *slot;
315 struct acpiphp_func *func;
317 list_for_each_entry(bridge, &bridge_list, list) {
318 for (slot = bridge->slots; slot; slot = slot->next) {
319 list_for_each_entry(func, &slot->funcs, sibling) {
320 if (func->handle == handle)
330 static inline void config_p2p_bridge_flags(struct acpiphp_bridge *bridge)
332 acpi_handle dummy_handle;
334 if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
335 "_STA", &dummy_handle)))
336 bridge->flags |= BRIDGE_HAS_STA;
338 if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
339 "_EJ0", &dummy_handle)))
340 bridge->flags |= BRIDGE_HAS_EJ0;
342 if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
343 "_PS0", &dummy_handle)))
344 bridge->flags |= BRIDGE_HAS_PS0;
346 if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
347 "_PS3", &dummy_handle)))
348 bridge->flags |= BRIDGE_HAS_PS3;
350 /* is this ejectable p2p bridge? */
351 if (bridge->flags & BRIDGE_HAS_EJ0) {
352 struct acpiphp_func *func;
354 dbg("found ejectable p2p bridge\n");
356 /* make link between PCI bridge and PCI function */
357 func = acpiphp_bridge_handle_to_function(bridge->handle);
361 func->bridge = bridge;
366 /* allocate and initialize host bridge data structure */
367 static void add_host_bridge(acpi_handle *handle)
369 struct acpiphp_bridge *bridge;
370 struct acpi_pci_root *root = acpi_pci_find_root(handle);
372 bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
376 bridge->type = BRIDGE_TYPE_HOST;
377 bridge->handle = handle;
379 bridge->pci_bus = root->bus;
381 spin_lock_init(&bridge->res_lock);
383 init_bridge_misc(bridge);
387 /* allocate and initialize PCI-to-PCI bridge data structure */
388 static void add_p2p_bridge(acpi_handle *handle)
390 struct acpiphp_bridge *bridge;
392 bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
393 if (bridge == NULL) {
394 err("out of memory\n");
398 bridge->type = BRIDGE_TYPE_P2P;
399 bridge->handle = handle;
400 config_p2p_bridge_flags(bridge);
402 bridge->pci_dev = acpi_get_pci_dev(handle);
403 bridge->pci_bus = bridge->pci_dev->subordinate;
404 if (!bridge->pci_bus) {
405 err("This is not a PCI-to-PCI bridge!\n");
410 * Grab a ref to the subordinate PCI bus in case the bus is
411 * removed via PCI core logical hotplug. The ref pins the bus
412 * (which we access during module unload).
414 get_device(&bridge->pci_bus->dev);
415 spin_lock_init(&bridge->res_lock);
417 init_bridge_misc(bridge);
420 pci_dev_put(bridge->pci_dev);
426 /* callback routine to find P2P bridges */
428 find_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
433 dev = acpi_get_pci_dev(handle);
434 if (!dev || !dev->subordinate)
437 /* check if this bridge has ejectable slots */
438 if ((detect_ejectable_slots(handle) > 0)) {
439 dbg("found PCI-to-PCI bridge at PCI %s\n", pci_name(dev));
440 add_p2p_bridge(handle);
443 /* search P2P bridges under this p2p bridge */
444 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
445 find_p2p_bridge, NULL, NULL, NULL);
446 if (ACPI_FAILURE(status))
447 warn("find_p2p_bridge failed (error code = 0x%x)\n", status);
455 /* find hot-pluggable slots, and then find P2P bridge */
456 static int add_bridge(acpi_handle handle)
459 unsigned long long tmp;
460 acpi_handle dummy_handle;
462 /* if the bridge doesn't have _STA, we assume it is always there */
463 status = acpi_get_handle(handle, "_STA", &dummy_handle);
464 if (ACPI_SUCCESS(status)) {
465 status = acpi_evaluate_integer(handle, "_STA", NULL, &tmp);
466 if (ACPI_FAILURE(status)) {
467 dbg("%s: _STA evaluation failure\n", __func__);
470 if ((tmp & ACPI_STA_FUNCTIONING) == 0)
471 /* don't register this object */
475 /* check if this bridge has ejectable slots */
476 if (detect_ejectable_slots(handle) > 0) {
477 dbg("found PCI host-bus bridge with hot-pluggable slots\n");
478 add_host_bridge(handle);
481 /* search P2P bridges under this host bridge */
482 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
483 find_p2p_bridge, NULL, NULL, NULL);
485 if (ACPI_FAILURE(status))
486 warn("find_p2p_bridge failed (error code = 0x%x)\n", status);
491 static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle)
493 struct acpiphp_bridge *bridge;
495 list_for_each_entry(bridge, &bridge_list, list)
496 if (bridge->handle == handle)
502 static void cleanup_bridge(struct acpiphp_bridge *bridge)
504 struct acpiphp_slot *slot, *next;
505 struct acpiphp_func *func, *tmp;
507 acpi_handle handle = bridge->handle;
509 status = acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
510 handle_hotplug_event_bridge);
511 if (ACPI_FAILURE(status))
512 err("failed to remove notify handler\n");
514 if ((bridge->type != BRIDGE_TYPE_HOST) &&
515 ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func)) {
516 status = acpi_install_notify_handler(bridge->func->handle,
518 handle_hotplug_event_func,
520 if (ACPI_FAILURE(status))
521 err("failed to install interrupt notify handler\n");
524 slot = bridge->slots;
527 list_for_each_entry_safe(func, tmp, &slot->funcs, sibling) {
528 if (is_dock_device(func->handle)) {
529 unregister_hotplug_dock_device(func->handle);
530 unregister_dock_notifier(&func->nb);
532 if (!(func->flags & FUNC_HAS_DCK)) {
533 status = acpi_remove_notify_handler(func->handle,
535 handle_hotplug_event_func);
536 if (ACPI_FAILURE(status))
537 err("failed to remove notify handler\n");
539 list_del(&func->sibling);
542 acpiphp_unregister_hotplug_slot(slot);
543 list_del(&slot->funcs);
549 * Only P2P bridges have a pci_dev
552 put_device(&bridge->pci_bus->dev);
554 pci_dev_put(bridge->pci_dev);
555 list_del(&bridge->list);
560 cleanup_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
562 struct acpiphp_bridge *bridge;
564 /* cleanup p2p bridges under this P2P bridge
565 in a depth-first manner */
566 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
567 cleanup_p2p_bridge, NULL, NULL, NULL);
569 bridge = acpiphp_handle_to_bridge(handle);
571 cleanup_bridge(bridge);
576 static void remove_bridge(acpi_handle handle)
578 struct acpiphp_bridge *bridge;
580 /* cleanup p2p bridges under this host bridge
581 in a depth-first manner */
582 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
583 (u32)1, cleanup_p2p_bridge, NULL, NULL, NULL);
586 * On root bridges with hotplug slots directly underneath (ie,
587 * no p2p bridge inbetween), we call cleanup_bridge().
589 * The else clause cleans up root bridges that either had no
590 * hotplug slots at all, or had a p2p bridge underneath.
592 bridge = acpiphp_handle_to_bridge(handle);
594 cleanup_bridge(bridge);
596 acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
597 handle_hotplug_event_bridge);
600 static int power_on_slot(struct acpiphp_slot *slot)
603 struct acpiphp_func *func;
606 /* if already enabled, just skip */
607 if (slot->flags & SLOT_POWEREDON)
610 list_for_each_entry(func, &slot->funcs, sibling) {
611 if (func->flags & FUNC_HAS_PS0) {
612 dbg("%s: executing _PS0\n", __func__);
613 status = acpi_evaluate_object(func->handle, "_PS0", NULL, NULL);
614 if (ACPI_FAILURE(status)) {
615 warn("%s: _PS0 failed\n", __func__);
623 /* TBD: evaluate _STA to check if the slot is enabled */
625 slot->flags |= SLOT_POWEREDON;
632 static int power_off_slot(struct acpiphp_slot *slot)
635 struct acpiphp_func *func;
639 /* if already disabled, just skip */
640 if ((slot->flags & SLOT_POWEREDON) == 0)
643 list_for_each_entry(func, &slot->funcs, sibling) {
644 if (func->flags & FUNC_HAS_PS3) {
645 status = acpi_evaluate_object(func->handle, "_PS3", NULL, NULL);
646 if (ACPI_FAILURE(status)) {
647 warn("%s: _PS3 failed\n", __func__);
655 /* TBD: evaluate _STA to check if the slot is disabled */
657 slot->flags &= (~SLOT_POWEREDON);
666 * acpiphp_max_busnr - return the highest reserved bus number under the given bus.
667 * @bus: bus to start search with
669 static unsigned char acpiphp_max_busnr(struct pci_bus *bus)
671 struct list_head *tmp;
672 unsigned char max, n;
675 * pci_bus_max_busnr will return the highest
676 * reserved busnr for all these children.
677 * that is equivalent to the bus->subordinate
678 * value. We don't want to use the parent's
679 * bus->subordinate value because it could have
682 max = bus->secondary;
684 list_for_each(tmp, &bus->children) {
685 n = pci_bus_max_busnr(pci_bus_b(tmp));
694 * acpiphp_bus_add - add a new bus to acpi subsystem
695 * @func: acpiphp_func of the bridge
697 static int acpiphp_bus_add(struct acpiphp_func *func)
700 struct acpi_device *device, *pdevice;
703 acpi_get_parent(func->handle, &phandle);
704 if (acpi_bus_get_device(phandle, &pdevice)) {
705 dbg("no parent device, assuming NULL\n");
708 if (!acpi_bus_get_device(func->handle, &device)) {
709 dbg("bus exists... trim\n");
710 /* this shouldn't be in here, so remove
711 * the bus then re-add it...
713 ret_val = acpi_bus_trim(device, 1);
714 dbg("acpi_bus_trim return %x\n", ret_val);
717 ret_val = acpi_bus_add(&device, pdevice, func->handle,
718 ACPI_BUS_TYPE_DEVICE);
720 dbg("error adding bus, %x\n",
722 goto acpiphp_bus_add_out;
724 ret_val = acpi_bus_start(device);
732 * acpiphp_bus_trim - trim a bus from acpi subsystem
733 * @handle: handle to acpi namespace
735 static int acpiphp_bus_trim(acpi_handle handle)
737 struct acpi_device *device;
740 retval = acpi_bus_get_device(handle, &device);
742 dbg("acpi_device not found\n");
746 retval = acpi_bus_trim(device, 1);
748 err("cannot remove from acpi list\n");
753 static void acpiphp_set_acpi_region(struct acpiphp_slot *slot)
755 struct acpiphp_func *func;
756 union acpi_object params[2];
757 struct acpi_object_list arg_list;
759 list_for_each_entry(func, &slot->funcs, sibling) {
761 arg_list.pointer = params;
762 params[0].type = ACPI_TYPE_INTEGER;
763 params[0].integer.value = ACPI_ADR_SPACE_PCI_CONFIG;
764 params[1].type = ACPI_TYPE_INTEGER;
765 params[1].integer.value = 1;
766 /* _REG is optional, we don't care about if there is failure */
767 acpi_evaluate_object(func->handle, "_REG", &arg_list, NULL);
772 * enable_device - enable, configure a slot
773 * @slot: slot to be enabled
775 * This function should be called per *physical slot*,
776 * not per each slot object in ACPI namespace.
778 static int __ref enable_device(struct acpiphp_slot *slot)
781 struct pci_bus *bus = slot->bridge->pci_bus;
782 struct acpiphp_func *func;
787 if (slot->flags & SLOT_ENABLED)
790 /* sanity check: dev should be NULL when hot-plugged in */
791 dev = pci_get_slot(bus, PCI_DEVFN(slot->device, 0));
793 /* This case shouldn't happen */
794 err("pci_dev structure already exists.\n");
800 num = pci_scan_slot(bus, PCI_DEVFN(slot->device, 0));
802 err("No new device found\n");
807 max = acpiphp_max_busnr(bus);
808 for (pass = 0; pass < 2; pass++) {
809 list_for_each_entry(dev, &bus->devices, bus_list) {
810 if (PCI_SLOT(dev->devfn) != slot->device)
812 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
813 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
814 max = pci_scan_bridge(bus, dev, max, pass);
815 if (pass && dev->subordinate)
816 pci_bus_size_bridges(dev->subordinate);
821 list_for_each_entry(func, &slot->funcs, sibling)
822 acpiphp_bus_add(func);
824 pci_bus_assign_resources(bus);
825 acpiphp_sanitize_bus(bus);
826 acpiphp_set_hpp_values(bus);
827 acpiphp_set_acpi_region(slot);
828 pci_enable_bridges(bus);
829 pci_bus_add_devices(bus);
831 list_for_each_entry(func, &slot->funcs, sibling) {
832 dev = pci_get_slot(bus, PCI_DEVFN(slot->device,
837 if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE &&
838 dev->hdr_type != PCI_HEADER_TYPE_CARDBUS) {
843 status = find_p2p_bridge(func->handle, (u32)1, bus, NULL);
844 if (ACPI_FAILURE(status))
845 warn("find_p2p_bridge failed (error code = 0x%x)\n",
850 slot->flags |= SLOT_ENABLED;
856 static void disable_bridges(struct pci_bus *bus)
859 list_for_each_entry(dev, &bus->devices, bus_list) {
860 if (dev->subordinate) {
861 disable_bridges(dev->subordinate);
862 pci_disable_device(dev);
868 * disable_device - disable a slot
869 * @slot: ACPI PHP slot
871 static int disable_device(struct acpiphp_slot *slot)
873 struct acpiphp_func *func;
874 struct pci_dev *pdev;
876 /* is this slot already disabled? */
877 if (!(slot->flags & SLOT_ENABLED))
880 list_for_each_entry(func, &slot->funcs, sibling) {
882 /* cleanup p2p bridges under this P2P bridge */
883 cleanup_p2p_bridge(func->bridge->handle,
888 pdev = pci_get_slot(slot->bridge->pci_bus,
889 PCI_DEVFN(slot->device, func->function));
891 pci_stop_bus_device(pdev);
892 if (pdev->subordinate) {
893 disable_bridges(pdev->subordinate);
894 pci_disable_device(pdev);
896 pci_remove_bus_device(pdev);
901 list_for_each_entry(func, &slot->funcs, sibling) {
902 acpiphp_bus_trim(func->handle);
905 slot->flags &= (~SLOT_ENABLED);
913 * get_slot_status - get ACPI slot status
914 * @slot: ACPI PHP slot
916 * If a slot has _STA for each function and if any one of them
917 * returned non-zero status, return it.
919 * If a slot doesn't have _STA and if any one of its functions'
920 * configuration space is configured, return 0x0f as a _STA.
922 * Otherwise return 0.
924 static unsigned int get_slot_status(struct acpiphp_slot *slot)
927 unsigned long long sta = 0;
929 struct acpiphp_func *func;
931 list_for_each_entry(func, &slot->funcs, sibling) {
932 if (func->flags & FUNC_HAS_STA) {
933 status = acpi_evaluate_integer(func->handle, "_STA", NULL, &sta);
934 if (ACPI_SUCCESS(status) && sta)
937 pci_bus_read_config_dword(slot->bridge->pci_bus,
938 PCI_DEVFN(slot->device,
940 PCI_VENDOR_ID, &dvid);
941 if (dvid != 0xffffffff) {
948 return (unsigned int)sta;
952 * acpiphp_eject_slot - physically eject the slot
953 * @slot: ACPI PHP slot
955 int acpiphp_eject_slot(struct acpiphp_slot *slot)
958 struct acpiphp_func *func;
959 struct acpi_object_list arg_list;
960 union acpi_object arg;
962 list_for_each_entry(func, &slot->funcs, sibling) {
963 /* We don't want to call _EJ0 on non-existing functions. */
964 if ((func->flags & FUNC_HAS_EJ0)) {
965 /* _EJ0 method take one argument */
967 arg_list.pointer = &arg;
968 arg.type = ACPI_TYPE_INTEGER;
969 arg.integer.value = 1;
971 status = acpi_evaluate_object(func->handle, "_EJ0", &arg_list, NULL);
972 if (ACPI_FAILURE(status)) {
973 warn("%s: _EJ0 failed\n", __func__);
983 * acpiphp_check_bridge - re-enumerate devices
984 * @bridge: where to begin re-enumeration
986 * Iterate over all slots under this bridge and make sure that if a
987 * card is present they are enabled, and if not they are disabled.
989 static int acpiphp_check_bridge(struct acpiphp_bridge *bridge)
991 struct acpiphp_slot *slot;
993 int enabled, disabled;
995 enabled = disabled = 0;
997 for (slot = bridge->slots; slot; slot = slot->next) {
998 unsigned int status = get_slot_status(slot);
999 if (slot->flags & SLOT_ENABLED) {
1000 if (status == ACPI_STA_ALL)
1002 retval = acpiphp_disable_slot(slot);
1004 err("Error occurred in disabling\n");
1007 acpiphp_eject_slot(slot);
1011 if (status != ACPI_STA_ALL)
1013 retval = acpiphp_enable_slot(slot);
1015 err("Error occurred in enabling\n");
1022 dbg("%s: %d enabled, %d disabled\n", __func__, enabled, disabled);
1028 static void acpiphp_set_hpp_values(struct pci_bus *bus)
1030 struct pci_dev *dev;
1032 list_for_each_entry(dev, &bus->devices, bus_list)
1033 pci_configure_slot(dev);
1037 * Remove devices for which we could not assign resources, call
1038 * arch specific code to fix-up the bus
1040 static void acpiphp_sanitize_bus(struct pci_bus *bus)
1042 struct pci_dev *dev;
1044 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM;
1046 list_for_each_entry(dev, &bus->devices, bus_list) {
1047 for (i=0; i<PCI_BRIDGE_RESOURCES; i++) {
1048 struct resource *res = &dev->resource[i];
1049 if ((res->flags & type_mask) && !res->start &&
1051 /* Could not assign a required resources
1052 * for this device, remove it */
1053 pci_remove_bus_device(dev);
1060 /* Program resources in newly inserted bridge */
1061 static int acpiphp_configure_bridge (acpi_handle handle)
1063 struct pci_bus *bus;
1065 if (acpi_is_root_bridge(handle)) {
1066 struct acpi_pci_root *root = acpi_pci_find_root(handle);
1069 struct pci_dev *pdev = acpi_get_pci_dev(handle);
1070 bus = pdev->subordinate;
1074 pci_bus_size_bridges(bus);
1075 pci_bus_assign_resources(bus);
1076 acpiphp_sanitize_bus(bus);
1077 acpiphp_set_hpp_values(bus);
1078 pci_enable_bridges(bus);
1082 static void handle_bridge_insertion(acpi_handle handle, u32 type)
1084 struct acpi_device *device, *pdevice;
1085 acpi_handle phandle;
1087 if ((type != ACPI_NOTIFY_BUS_CHECK) &&
1088 (type != ACPI_NOTIFY_DEVICE_CHECK)) {
1089 err("unexpected notification type %d\n", type);
1093 acpi_get_parent(handle, &phandle);
1094 if (acpi_bus_get_device(phandle, &pdevice)) {
1095 dbg("no parent device, assuming NULL\n");
1098 if (acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE)) {
1099 err("cannot add bridge to acpi list\n");
1102 if (!acpiphp_configure_bridge(handle) &&
1103 !acpi_bus_start(device))
1106 err("cannot configure and start bridge\n");
1111 * ACPI event handlers
1115 count_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1117 int *count = (int *)context;
1118 struct acpiphp_bridge *bridge;
1120 bridge = acpiphp_handle_to_bridge(handle);
1127 check_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1129 struct acpiphp_bridge *bridge;
1131 struct acpi_buffer buffer = { .length = sizeof(objname),
1132 .pointer = objname };
1134 bridge = acpiphp_handle_to_bridge(handle);
1136 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1137 dbg("%s: re-enumerating slots under %s\n",
1139 acpiphp_check_bridge(bridge);
1145 * handle_hotplug_event_bridge - handle ACPI event on bridges
1146 * @handle: Notify()'ed acpi_handle
1147 * @type: Notify code
1148 * @context: pointer to acpiphp_bridge structure
1150 * Handles ACPI event notification on {host,p2p} bridges.
1152 static void handle_hotplug_event_bridge(acpi_handle handle, u32 type, void *context)
1154 struct acpiphp_bridge *bridge;
1156 struct acpi_buffer buffer = { .length = sizeof(objname),
1157 .pointer = objname };
1158 struct acpi_device *device;
1159 int num_sub_bridges = 0;
1161 if (acpi_bus_get_device(handle, &device)) {
1162 /* This bridge must have just been physically inserted */
1163 handle_bridge_insertion(handle, type);
1167 bridge = acpiphp_handle_to_bridge(handle);
1168 if (type == ACPI_NOTIFY_BUS_CHECK) {
1169 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, ACPI_UINT32_MAX,
1170 count_sub_bridges, NULL, &num_sub_bridges, NULL);
1173 if (!bridge && !num_sub_bridges) {
1174 err("cannot get bridge info\n");
1178 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1181 case ACPI_NOTIFY_BUS_CHECK:
1182 /* bus re-enumerate */
1183 dbg("%s: Bus check notify on %s\n", __func__, objname);
1185 dbg("%s: re-enumerating slots under %s\n",
1187 acpiphp_check_bridge(bridge);
1189 if (num_sub_bridges)
1190 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
1191 ACPI_UINT32_MAX, check_sub_bridges, NULL, NULL, NULL);
1194 case ACPI_NOTIFY_DEVICE_CHECK:
1196 dbg("%s: Device check notify on %s\n", __func__, objname);
1197 acpiphp_check_bridge(bridge);
1200 case ACPI_NOTIFY_DEVICE_WAKE:
1202 dbg("%s: Device wake notify on %s\n", __func__, objname);
1205 case ACPI_NOTIFY_EJECT_REQUEST:
1206 /* request device eject */
1207 dbg("%s: Device eject notify on %s\n", __func__, objname);
1208 if ((bridge->type != BRIDGE_TYPE_HOST) &&
1209 (bridge->flags & BRIDGE_HAS_EJ0)) {
1210 struct acpiphp_slot *slot;
1211 slot = bridge->func->slot;
1212 if (!acpiphp_disable_slot(slot))
1213 acpiphp_eject_slot(slot);
1217 case ACPI_NOTIFY_FREQUENCY_MISMATCH:
1218 printk(KERN_ERR "Device %s cannot be configured due"
1219 " to a frequency mismatch\n", objname);
1222 case ACPI_NOTIFY_BUS_MODE_MISMATCH:
1223 printk(KERN_ERR "Device %s cannot be configured due"
1224 " to a bus mode mismatch\n", objname);
1227 case ACPI_NOTIFY_POWER_FAULT:
1228 printk(KERN_ERR "Device %s has suffered a power fault\n",
1233 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
1239 * handle_hotplug_event_func - handle ACPI event on functions (i.e. slots)
1240 * @handle: Notify()'ed acpi_handle
1241 * @type: Notify code
1242 * @context: pointer to acpiphp_func structure
1244 * Handles ACPI event notification on slots.
1246 static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context)
1248 struct acpiphp_func *func;
1250 struct acpi_buffer buffer = { .length = sizeof(objname),
1251 .pointer = objname };
1253 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1255 func = (struct acpiphp_func *)context;
1258 case ACPI_NOTIFY_BUS_CHECK:
1259 /* bus re-enumerate */
1260 dbg("%s: Bus check notify on %s\n", __func__, objname);
1261 acpiphp_enable_slot(func->slot);
1264 case ACPI_NOTIFY_DEVICE_CHECK:
1265 /* device check : re-enumerate from parent bus */
1266 dbg("%s: Device check notify on %s\n", __func__, objname);
1267 acpiphp_check_bridge(func->slot->bridge);
1270 case ACPI_NOTIFY_DEVICE_WAKE:
1272 dbg("%s: Device wake notify on %s\n", __func__, objname);
1275 case ACPI_NOTIFY_EJECT_REQUEST:
1276 /* request device eject */
1277 dbg("%s: Device eject notify on %s\n", __func__, objname);
1278 if (!(acpiphp_disable_slot(func->slot)))
1279 acpiphp_eject_slot(func->slot);
1283 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
1290 find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1292 int *count = (int *)context;
1294 if (acpi_is_root_bridge(handle)) {
1295 acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
1296 handle_hotplug_event_bridge, NULL);
1302 static struct acpi_pci_driver acpi_pci_hp_driver = {
1304 .remove = remove_bridge,
1308 * acpiphp_glue_init - initializes all PCI hotplug - ACPI glue data structures
1310 int __init acpiphp_glue_init(void)
1314 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
1315 ACPI_UINT32_MAX, find_root_bridges, NULL, &num, NULL);
1320 acpi_pci_register_driver(&acpi_pci_hp_driver);
1327 * acpiphp_glue_exit - terminates all PCI hotplug - ACPI glue data structures
1329 * This function frees all data allocated in acpiphp_glue_init().
1331 void acpiphp_glue_exit(void)
1333 acpi_pci_unregister_driver(&acpi_pci_hp_driver);
1338 * acpiphp_get_num_slots - count number of slots in a system
1340 int __init acpiphp_get_num_slots(void)
1342 struct acpiphp_bridge *bridge;
1345 list_for_each_entry(bridge, &bridge_list, list) {
1346 dbg("Bus %04x:%02x has %d slot%s\n",
1347 pci_domain_nr(bridge->pci_bus),
1348 bridge->pci_bus->number, bridge->nr_slots,
1349 bridge->nr_slots == 1 ? "" : "s");
1350 num_slots += bridge->nr_slots;
1353 dbg("Total %d slots\n", num_slots);
1360 * acpiphp_for_each_slot - call function for each slot
1361 * @fn: callback function
1362 * @data: context to be passed to callback function
1364 static int acpiphp_for_each_slot(acpiphp_callback fn, void *data)
1366 struct list_head *node;
1367 struct acpiphp_bridge *bridge;
1368 struct acpiphp_slot *slot;
1371 list_for_each (node, &bridge_list) {
1372 bridge = (struct acpiphp_bridge *)node;
1373 for (slot = bridge->slots; slot; slot = slot->next) {
1374 retval = fn(slot, data);
1387 * acpiphp_enable_slot - power on slot
1388 * @slot: ACPI PHP slot
1390 int acpiphp_enable_slot(struct acpiphp_slot *slot)
1394 mutex_lock(&slot->crit_sect);
1396 /* wake up all functions */
1397 retval = power_on_slot(slot);
1401 if (get_slot_status(slot) == ACPI_STA_ALL) {
1402 /* configure all functions */
1403 retval = enable_device(slot);
1405 power_off_slot(slot);
1407 dbg("%s: Slot status is not ACPI_STA_ALL\n", __func__);
1408 power_off_slot(slot);
1412 mutex_unlock(&slot->crit_sect);
1417 * acpiphp_disable_slot - power off slot
1418 * @slot: ACPI PHP slot
1420 int acpiphp_disable_slot(struct acpiphp_slot *slot)
1424 mutex_lock(&slot->crit_sect);
1426 /* unconfigure all functions */
1427 retval = disable_device(slot);
1431 /* power off all functions */
1432 retval = power_off_slot(slot);
1437 mutex_unlock(&slot->crit_sect);
1446 u8 acpiphp_get_power_status(struct acpiphp_slot *slot)
1448 return (slot->flags & SLOT_POWEREDON);
1456 u8 acpiphp_get_latch_status(struct acpiphp_slot *slot)
1460 sta = get_slot_status(slot);
1462 return (sta & ACPI_STA_SHOW_IN_UI) ? 0 : 1;
1467 * adapter presence : 1
1470 u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot)
1474 sta = get_slot_status(slot);
1476 return (sta == 0) ? 0 : 1;