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>
54 static LIST_HEAD(bridge_list);
56 #define MY_NAME "acpiphp_glue"
58 static void handle_hotplug_event_bridge (acpi_handle, u32, void *);
59 static void acpiphp_sanitize_bus(struct pci_bus *bus);
60 static void acpiphp_set_hpp_values(struct pci_bus *bus);
61 static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context);
63 /* callback routine to check for the existence of a pci dock device */
65 is_pci_dock_device(acpi_handle handle, u32 lvl, void *context, void **rv)
67 int *count = (int *)context;
69 if (is_dock_device(handle)) {
71 return AE_CTRL_TERMINATE;
78 * the _DCK method can do funny things... and sometimes not
81 * TBD - figure out a way to only call fixups for
82 * systems that require them.
84 static int post_dock_fixups(struct notifier_block *nb, unsigned long val,
87 struct acpiphp_func *func = container_of(nb, struct acpiphp_func, nb);
88 struct pci_bus *bus = func->slot->bridge->pci_bus;
94 /* fixup bad _DCK function that rewrites
95 * secondary bridge on slot
97 pci_read_config_dword(bus->self,
101 if (((buses >> 8) & 0xff) != bus->secondary) {
102 buses = (buses & 0xff000000)
103 | ((unsigned int)(bus->primary) << 0)
104 | ((unsigned int)(bus->secondary) << 8)
105 | ((unsigned int)(bus->subordinate) << 16);
106 pci_write_config_dword(bus->self, PCI_PRIMARY_BUS, buses);
112 static struct acpi_dock_ops acpiphp_dock_ops = {
113 .handler = handle_hotplug_event_func,
116 /* callback routine to register each ACPI PCI slot object */
118 register_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
120 struct acpiphp_bridge *bridge = (struct acpiphp_bridge *)context;
121 struct acpiphp_slot *slot;
122 struct acpiphp_func *newfunc;
124 acpi_status status = AE_OK;
125 unsigned long long adr, sun;
126 int device, function, retval;
127 struct pci_bus *pbus = bridge->pci_bus;
128 struct pci_dev *pdev;
130 if (!acpi_pci_check_ejectable(pbus, handle) && !is_dock_device(handle))
133 acpi_evaluate_integer(handle, "_ADR", NULL, &adr);
134 device = (adr >> 16) & 0xffff;
135 function = adr & 0xffff;
137 newfunc = kzalloc(sizeof(struct acpiphp_func), GFP_KERNEL);
141 INIT_LIST_HEAD(&newfunc->sibling);
142 newfunc->handle = handle;
143 newfunc->function = function;
145 if (ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp)))
146 newfunc->flags = FUNC_HAS_EJ0;
148 if (ACPI_SUCCESS(acpi_get_handle(handle, "_STA", &tmp)))
149 newfunc->flags |= FUNC_HAS_STA;
151 if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS0", &tmp)))
152 newfunc->flags |= FUNC_HAS_PS0;
154 if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS3", &tmp)))
155 newfunc->flags |= FUNC_HAS_PS3;
157 if (ACPI_SUCCESS(acpi_get_handle(handle, "_DCK", &tmp)))
158 newfunc->flags |= FUNC_HAS_DCK;
160 status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun);
161 if (ACPI_FAILURE(status)) {
163 * use the count of the number of slots we've found
164 * for the number of the slot
166 sun = bridge->nr_slots+1;
169 /* search for objects that share the same slot */
170 for (slot = bridge->slots; slot; slot = slot->next)
171 if (slot->device == device) {
172 if (slot->sun != sun)
173 warn("sibling found, but _SUN doesn't match!\n");
178 slot = kzalloc(sizeof(struct acpiphp_slot), GFP_KERNEL);
184 slot->bridge = bridge;
185 slot->device = device;
187 INIT_LIST_HEAD(&slot->funcs);
188 mutex_init(&slot->crit_sect);
190 slot->next = bridge->slots;
191 bridge->slots = slot;
195 dbg("found ACPI PCI Hotplug slot %llu at PCI %04x:%02x:%02x\n",
196 slot->sun, pci_domain_nr(pbus), pbus->number, device);
197 retval = acpiphp_register_hotplug_slot(slot);
199 if (retval == -EBUSY)
200 warn("Slot %llu already registered by another "
201 "hotplug driver\n", slot->sun);
203 warn("acpiphp_register_hotplug_slot failed "
204 "(err code = 0x%x)\n", retval);
209 newfunc->slot = slot;
210 list_add_tail(&newfunc->sibling, &slot->funcs);
212 pdev = pci_get_slot(pbus, PCI_DEVFN(device, function));
214 slot->flags |= (SLOT_ENABLED | SLOT_POWEREDON);
218 if (is_dock_device(handle)) {
219 /* we don't want to call this device's _EJ0
220 * because we want the dock notify handler
221 * to call it after it calls _DCK
223 newfunc->flags &= ~FUNC_HAS_EJ0;
224 if (register_hotplug_dock_device(handle,
225 &acpiphp_dock_ops, newfunc))
226 dbg("failed to register dock device\n");
228 /* we need to be notified when dock events happen
229 * outside of the hotplug operation, since we may
230 * need to do fixups before we can hotplug.
232 newfunc->nb.notifier_call = post_dock_fixups;
233 if (register_dock_notifier(&newfunc->nb))
234 dbg("failed to register a dock notifier");
237 /* install notify handler */
238 if (!(newfunc->flags & FUNC_HAS_DCK)) {
239 status = acpi_install_notify_handler(handle,
241 handle_hotplug_event_func,
244 if (ACPI_FAILURE(status))
245 err("failed to register interrupt notify handler\n");
253 bridge->slots = slot->next;
261 /* see if it's worth looking at this bridge */
262 static int detect_ejectable_slots(acpi_handle handle)
264 int found = acpi_pci_detect_ejectable(handle);
266 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
267 is_pci_dock_device, (void *)&found, NULL);
272 /* initialize miscellaneous stuff for both root and PCI-to-PCI bridge */
273 static void init_bridge_misc(struct acpiphp_bridge *bridge)
277 /* must be added to the list prior to calling register_slot */
278 list_add(&bridge->list, &bridge_list);
280 /* register all slot objects under this bridge */
281 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge->handle, (u32)1,
282 register_slot, bridge, NULL);
283 if (ACPI_FAILURE(status)) {
284 list_del(&bridge->list);
288 /* install notify handler */
289 if (bridge->type != BRIDGE_TYPE_HOST) {
290 if ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func) {
291 status = acpi_remove_notify_handler(bridge->func->handle,
293 handle_hotplug_event_func);
294 if (ACPI_FAILURE(status))
295 err("failed to remove notify handler\n");
297 status = acpi_install_notify_handler(bridge->handle,
299 handle_hotplug_event_bridge,
302 if (ACPI_FAILURE(status)) {
303 err("failed to register interrupt notify handler\n");
309 /* find acpiphp_func from acpiphp_bridge */
310 static struct acpiphp_func *acpiphp_bridge_handle_to_function(acpi_handle handle)
312 struct list_head *node, *l;
313 struct acpiphp_bridge *bridge;
314 struct acpiphp_slot *slot;
315 struct acpiphp_func *func;
317 list_for_each(node, &bridge_list) {
318 bridge = list_entry(node, struct acpiphp_bridge, list);
319 for (slot = bridge->slots; slot; slot = slot->next) {
320 list_for_each(l, &slot->funcs) {
321 func = list_entry(l, struct acpiphp_func,
323 if (func->handle == handle)
333 static inline void config_p2p_bridge_flags(struct acpiphp_bridge *bridge)
335 acpi_handle dummy_handle;
337 if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
338 "_STA", &dummy_handle)))
339 bridge->flags |= BRIDGE_HAS_STA;
341 if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
342 "_EJ0", &dummy_handle)))
343 bridge->flags |= BRIDGE_HAS_EJ0;
345 if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
346 "_PS0", &dummy_handle)))
347 bridge->flags |= BRIDGE_HAS_PS0;
349 if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
350 "_PS3", &dummy_handle)))
351 bridge->flags |= BRIDGE_HAS_PS3;
353 /* is this ejectable p2p bridge? */
354 if (bridge->flags & BRIDGE_HAS_EJ0) {
355 struct acpiphp_func *func;
357 dbg("found ejectable p2p bridge\n");
359 /* make link between PCI bridge and PCI function */
360 func = acpiphp_bridge_handle_to_function(bridge->handle);
364 func->bridge = bridge;
369 /* allocate and initialize host bridge data structure */
370 static void add_host_bridge(acpi_handle *handle)
372 struct acpiphp_bridge *bridge;
373 struct acpi_pci_root *root = acpi_pci_find_root(handle);
375 bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
379 bridge->type = BRIDGE_TYPE_HOST;
380 bridge->handle = handle;
382 bridge->pci_bus = root->bus;
384 spin_lock_init(&bridge->res_lock);
386 init_bridge_misc(bridge);
390 /* allocate and initialize PCI-to-PCI bridge data structure */
391 static void add_p2p_bridge(acpi_handle *handle)
393 struct acpiphp_bridge *bridge;
395 bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
396 if (bridge == NULL) {
397 err("out of memory\n");
401 bridge->type = BRIDGE_TYPE_P2P;
402 bridge->handle = handle;
403 config_p2p_bridge_flags(bridge);
405 bridge->pci_dev = acpi_get_pci_dev(handle);
406 bridge->pci_bus = bridge->pci_dev->subordinate;
407 if (!bridge->pci_bus) {
408 err("This is not a PCI-to-PCI bridge!\n");
413 * Grab a ref to the subordinate PCI bus in case the bus is
414 * removed via PCI core logical hotplug. The ref pins the bus
415 * (which we access during module unload).
417 get_device(&bridge->pci_bus->dev);
418 spin_lock_init(&bridge->res_lock);
420 init_bridge_misc(bridge);
423 pci_dev_put(bridge->pci_dev);
429 /* callback routine to find P2P bridges */
431 find_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
436 dev = acpi_get_pci_dev(handle);
437 if (!dev || !dev->subordinate)
440 /* check if this bridge has ejectable slots */
441 if ((detect_ejectable_slots(handle) > 0)) {
442 dbg("found PCI-to-PCI bridge at PCI %s\n", pci_name(dev));
443 add_p2p_bridge(handle);
446 /* search P2P bridges under this p2p bridge */
447 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
448 find_p2p_bridge, NULL, NULL);
449 if (ACPI_FAILURE(status))
450 warn("find_p2p_bridge failed (error code = 0x%x)\n", status);
458 /* find hot-pluggable slots, and then find P2P bridge */
459 static int add_bridge(acpi_handle handle)
462 unsigned long long tmp;
463 acpi_handle dummy_handle;
465 /* if the bridge doesn't have _STA, we assume it is always there */
466 status = acpi_get_handle(handle, "_STA", &dummy_handle);
467 if (ACPI_SUCCESS(status)) {
468 status = acpi_evaluate_integer(handle, "_STA", NULL, &tmp);
469 if (ACPI_FAILURE(status)) {
470 dbg("%s: _STA evaluation failure\n", __func__);
473 if ((tmp & ACPI_STA_FUNCTIONING) == 0)
474 /* don't register this object */
478 /* check if this bridge has ejectable slots */
479 if (detect_ejectable_slots(handle) > 0) {
480 dbg("found PCI host-bus bridge with hot-pluggable slots\n");
481 add_host_bridge(handle);
484 /* search P2P bridges under this host bridge */
485 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
486 find_p2p_bridge, NULL, NULL);
488 if (ACPI_FAILURE(status))
489 warn("find_p2p_bridge failed (error code = 0x%x)\n", status);
494 static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle)
496 struct list_head *head;
497 list_for_each(head, &bridge_list) {
498 struct acpiphp_bridge *bridge = list_entry(head,
499 struct acpiphp_bridge, list);
500 if (bridge->handle == handle)
507 static void cleanup_bridge(struct acpiphp_bridge *bridge)
509 struct list_head *list, *tmp;
510 struct acpiphp_slot *slot;
512 acpi_handle handle = bridge->handle;
514 status = acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
515 handle_hotplug_event_bridge);
516 if (ACPI_FAILURE(status))
517 err("failed to remove notify handler\n");
519 if ((bridge->type != BRIDGE_TYPE_HOST) &&
520 ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func)) {
521 status = acpi_install_notify_handler(bridge->func->handle,
523 handle_hotplug_event_func,
525 if (ACPI_FAILURE(status))
526 err("failed to install interrupt notify handler\n");
529 slot = bridge->slots;
531 struct acpiphp_slot *next = slot->next;
532 list_for_each_safe (list, tmp, &slot->funcs) {
533 struct acpiphp_func *func;
534 func = list_entry(list, struct acpiphp_func, sibling);
535 if (is_dock_device(func->handle)) {
536 unregister_hotplug_dock_device(func->handle);
537 unregister_dock_notifier(&func->nb);
539 if (!(func->flags & FUNC_HAS_DCK)) {
540 status = acpi_remove_notify_handler(func->handle,
542 handle_hotplug_event_func);
543 if (ACPI_FAILURE(status))
544 err("failed to remove notify handler\n");
549 acpiphp_unregister_hotplug_slot(slot);
550 list_del(&slot->funcs);
556 * Only P2P bridges have a pci_dev
559 put_device(&bridge->pci_bus->dev);
561 pci_dev_put(bridge->pci_dev);
562 list_del(&bridge->list);
567 cleanup_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
569 struct acpiphp_bridge *bridge;
571 /* cleanup p2p bridges under this P2P bridge
572 in a depth-first manner */
573 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
574 cleanup_p2p_bridge, NULL, NULL);
576 bridge = acpiphp_handle_to_bridge(handle);
578 cleanup_bridge(bridge);
583 static void remove_bridge(acpi_handle handle)
585 struct acpiphp_bridge *bridge;
587 /* cleanup p2p bridges under this host bridge
588 in a depth-first manner */
589 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
590 (u32)1, cleanup_p2p_bridge, NULL, NULL);
593 * On root bridges with hotplug slots directly underneath (ie,
594 * no p2p bridge inbetween), we call cleanup_bridge().
596 * The else clause cleans up root bridges that either had no
597 * hotplug slots at all, or had a p2p bridge underneath.
599 bridge = acpiphp_handle_to_bridge(handle);
601 cleanup_bridge(bridge);
603 acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
604 handle_hotplug_event_bridge);
607 static int power_on_slot(struct acpiphp_slot *slot)
610 struct acpiphp_func *func;
614 /* if already enabled, just skip */
615 if (slot->flags & SLOT_POWEREDON)
618 list_for_each (l, &slot->funcs) {
619 func = list_entry(l, struct acpiphp_func, sibling);
621 if (func->flags & FUNC_HAS_PS0) {
622 dbg("%s: executing _PS0\n", __func__);
623 status = acpi_evaluate_object(func->handle, "_PS0", NULL, NULL);
624 if (ACPI_FAILURE(status)) {
625 warn("%s: _PS0 failed\n", __func__);
633 /* TBD: evaluate _STA to check if the slot is enabled */
635 slot->flags |= SLOT_POWEREDON;
642 static int power_off_slot(struct acpiphp_slot *slot)
645 struct acpiphp_func *func;
650 /* if already disabled, just skip */
651 if ((slot->flags & SLOT_POWEREDON) == 0)
654 list_for_each (l, &slot->funcs) {
655 func = list_entry(l, struct acpiphp_func, sibling);
657 if (func->flags & FUNC_HAS_PS3) {
658 status = acpi_evaluate_object(func->handle, "_PS3", NULL, NULL);
659 if (ACPI_FAILURE(status)) {
660 warn("%s: _PS3 failed\n", __func__);
668 /* TBD: evaluate _STA to check if the slot is disabled */
670 slot->flags &= (~SLOT_POWEREDON);
679 * acpiphp_max_busnr - return the highest reserved bus number under the given bus.
680 * @bus: bus to start search with
682 static unsigned char acpiphp_max_busnr(struct pci_bus *bus)
684 struct list_head *tmp;
685 unsigned char max, n;
688 * pci_bus_max_busnr will return the highest
689 * reserved busnr for all these children.
690 * that is equivalent to the bus->subordinate
691 * value. We don't want to use the parent's
692 * bus->subordinate value because it could have
695 max = bus->secondary;
697 list_for_each(tmp, &bus->children) {
698 n = pci_bus_max_busnr(pci_bus_b(tmp));
707 * acpiphp_bus_add - add a new bus to acpi subsystem
708 * @func: acpiphp_func of the bridge
710 static int acpiphp_bus_add(struct acpiphp_func *func)
713 struct acpi_device *device, *pdevice;
716 acpi_get_parent(func->handle, &phandle);
717 if (acpi_bus_get_device(phandle, &pdevice)) {
718 dbg("no parent device, assuming NULL\n");
721 if (!acpi_bus_get_device(func->handle, &device)) {
722 dbg("bus exists... trim\n");
723 /* this shouldn't be in here, so remove
724 * the bus then re-add it...
726 ret_val = acpi_bus_trim(device, 1);
727 dbg("acpi_bus_trim return %x\n", ret_val);
730 ret_val = acpi_bus_add(&device, pdevice, func->handle,
731 ACPI_BUS_TYPE_DEVICE);
733 dbg("error adding bus, %x\n",
735 goto acpiphp_bus_add_out;
738 * try to start anyway. We could have failed to add
739 * simply because this bus had previously been added
740 * on another add. Don't bother with the return value
741 * we just keep going.
743 ret_val = acpi_bus_start(device);
751 * acpiphp_bus_trim - trim a bus from acpi subsystem
752 * @handle: handle to acpi namespace
754 static int acpiphp_bus_trim(acpi_handle handle)
756 struct acpi_device *device;
759 retval = acpi_bus_get_device(handle, &device);
761 dbg("acpi_device not found\n");
765 retval = acpi_bus_trim(device, 1);
767 err("cannot remove from acpi list\n");
773 * enable_device - enable, configure a slot
774 * @slot: slot to be enabled
776 * This function should be called per *physical slot*,
777 * not per each slot object in ACPI namespace.
779 static int __ref enable_device(struct acpiphp_slot *slot)
782 struct pci_bus *bus = slot->bridge->pci_bus;
784 struct acpiphp_func *func;
789 if (slot->flags & SLOT_ENABLED)
792 /* sanity check: dev should be NULL when hot-plugged in */
793 dev = pci_get_slot(bus, PCI_DEVFN(slot->device, 0));
795 /* This case shouldn't happen */
796 err("pci_dev structure already exists.\n");
802 num = pci_scan_slot(bus, PCI_DEVFN(slot->device, 0));
804 err("No new device found\n");
809 max = acpiphp_max_busnr(bus);
810 for (pass = 0; pass < 2; pass++) {
811 list_for_each_entry(dev, &bus->devices, bus_list) {
812 if (PCI_SLOT(dev->devfn) != slot->device)
814 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
815 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
816 max = pci_scan_bridge(bus, dev, max, pass);
817 if (pass && dev->subordinate)
818 pci_bus_size_bridges(dev->subordinate);
823 list_for_each (l, &slot->funcs) {
824 func = list_entry(l, struct acpiphp_func, sibling);
825 acpiphp_bus_add(func);
828 pci_bus_assign_resources(bus);
829 acpiphp_sanitize_bus(bus);
830 acpiphp_set_hpp_values(bus);
831 pci_enable_bridges(bus);
832 pci_bus_add_devices(bus);
834 list_for_each (l, &slot->funcs) {
835 func = list_entry(l, struct acpiphp_func, sibling);
836 dev = pci_get_slot(bus, PCI_DEVFN(slot->device,
841 if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE &&
842 dev->hdr_type != PCI_HEADER_TYPE_CARDBUS) {
847 status = find_p2p_bridge(func->handle, (u32)1, bus, NULL);
848 if (ACPI_FAILURE(status))
849 warn("find_p2p_bridge failed (error code = 0x%x)\n",
854 slot->flags |= SLOT_ENABLED;
860 static void disable_bridges(struct pci_bus *bus)
863 list_for_each_entry(dev, &bus->devices, bus_list) {
864 if (dev->subordinate) {
865 disable_bridges(dev->subordinate);
866 pci_disable_device(dev);
872 * disable_device - disable a slot
873 * @slot: ACPI PHP slot
875 static int disable_device(struct acpiphp_slot *slot)
877 struct acpiphp_func *func;
878 struct pci_dev *pdev;
880 /* is this slot already disabled? */
881 if (!(slot->flags & SLOT_ENABLED))
884 list_for_each_entry(func, &slot->funcs, sibling) {
886 /* cleanup p2p bridges under this P2P bridge */
887 cleanup_p2p_bridge(func->bridge->handle,
892 pdev = pci_get_slot(slot->bridge->pci_bus,
893 PCI_DEVFN(slot->device, func->function));
895 pci_stop_bus_device(pdev);
896 if (pdev->subordinate) {
897 disable_bridges(pdev->subordinate);
898 pci_disable_device(pdev);
900 pci_remove_bus_device(pdev);
905 list_for_each_entry(func, &slot->funcs, sibling) {
906 acpiphp_bus_trim(func->handle);
909 slot->flags &= (~SLOT_ENABLED);
917 * get_slot_status - get ACPI slot status
918 * @slot: ACPI PHP slot
920 * If a slot has _STA for each function and if any one of them
921 * returned non-zero status, return it.
923 * If a slot doesn't have _STA and if any one of its functions'
924 * configuration space is configured, return 0x0f as a _STA.
926 * Otherwise return 0.
928 static unsigned int get_slot_status(struct acpiphp_slot *slot)
931 unsigned long long sta = 0;
934 struct acpiphp_func *func;
936 list_for_each (l, &slot->funcs) {
937 func = list_entry(l, struct acpiphp_func, sibling);
939 if (func->flags & FUNC_HAS_STA) {
940 status = acpi_evaluate_integer(func->handle, "_STA", NULL, &sta);
941 if (ACPI_SUCCESS(status) && sta)
944 pci_bus_read_config_dword(slot->bridge->pci_bus,
945 PCI_DEVFN(slot->device,
947 PCI_VENDOR_ID, &dvid);
948 if (dvid != 0xffffffff) {
955 return (unsigned int)sta;
959 * acpiphp_eject_slot - physically eject the slot
960 * @slot: ACPI PHP slot
962 int acpiphp_eject_slot(struct acpiphp_slot *slot)
965 struct acpiphp_func *func;
967 struct acpi_object_list arg_list;
968 union acpi_object arg;
970 list_for_each (l, &slot->funcs) {
971 func = list_entry(l, struct acpiphp_func, sibling);
973 /* We don't want to call _EJ0 on non-existing functions. */
974 if ((func->flags & FUNC_HAS_EJ0)) {
975 /* _EJ0 method take one argument */
977 arg_list.pointer = &arg;
978 arg.type = ACPI_TYPE_INTEGER;
979 arg.integer.value = 1;
981 status = acpi_evaluate_object(func->handle, "_EJ0", &arg_list, NULL);
982 if (ACPI_FAILURE(status)) {
983 warn("%s: _EJ0 failed\n", __func__);
993 * acpiphp_check_bridge - re-enumerate devices
994 * @bridge: where to begin re-enumeration
996 * Iterate over all slots under this bridge and make sure that if a
997 * card is present they are enabled, and if not they are disabled.
999 static int acpiphp_check_bridge(struct acpiphp_bridge *bridge)
1001 struct acpiphp_slot *slot;
1003 int enabled, disabled;
1005 enabled = disabled = 0;
1007 for (slot = bridge->slots; slot; slot = slot->next) {
1008 unsigned int status = get_slot_status(slot);
1009 if (slot->flags & SLOT_ENABLED) {
1010 if (status == ACPI_STA_ALL)
1012 retval = acpiphp_disable_slot(slot);
1014 err("Error occurred in disabling\n");
1017 acpiphp_eject_slot(slot);
1021 if (status != ACPI_STA_ALL)
1023 retval = acpiphp_enable_slot(slot);
1025 err("Error occurred in enabling\n");
1032 dbg("%s: %d enabled, %d disabled\n", __func__, enabled, disabled);
1038 static void acpiphp_set_hpp_values(struct pci_bus *bus)
1040 struct pci_dev *dev;
1042 list_for_each_entry(dev, &bus->devices, bus_list)
1043 pci_configure_slot(dev);
1047 * Remove devices for which we could not assign resources, call
1048 * arch specific code to fix-up the bus
1050 static void acpiphp_sanitize_bus(struct pci_bus *bus)
1052 struct pci_dev *dev;
1054 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM;
1056 list_for_each_entry(dev, &bus->devices, bus_list) {
1057 for (i=0; i<PCI_BRIDGE_RESOURCES; i++) {
1058 struct resource *res = &dev->resource[i];
1059 if ((res->flags & type_mask) && !res->start &&
1061 /* Could not assign a required resources
1062 * for this device, remove it */
1063 pci_remove_bus_device(dev);
1070 /* Program resources in newly inserted bridge */
1071 static int acpiphp_configure_bridge (acpi_handle handle)
1073 struct pci_bus *bus;
1075 if (acpi_is_root_bridge(handle)) {
1076 struct acpi_pci_root *root = acpi_pci_find_root(handle);
1079 struct pci_dev *pdev = acpi_get_pci_dev(handle);
1080 bus = pdev->subordinate;
1084 pci_bus_size_bridges(bus);
1085 pci_bus_assign_resources(bus);
1086 acpiphp_sanitize_bus(bus);
1087 acpiphp_set_hpp_values(bus);
1088 pci_enable_bridges(bus);
1092 static void handle_bridge_insertion(acpi_handle handle, u32 type)
1094 struct acpi_device *device, *pdevice;
1095 acpi_handle phandle;
1097 if ((type != ACPI_NOTIFY_BUS_CHECK) &&
1098 (type != ACPI_NOTIFY_DEVICE_CHECK)) {
1099 err("unexpected notification type %d\n", type);
1103 acpi_get_parent(handle, &phandle);
1104 if (acpi_bus_get_device(phandle, &pdevice)) {
1105 dbg("no parent device, assuming NULL\n");
1108 if (acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE)) {
1109 err("cannot add bridge to acpi list\n");
1112 if (!acpiphp_configure_bridge(handle) &&
1113 !acpi_bus_start(device))
1116 err("cannot configure and start bridge\n");
1121 * ACPI event handlers
1125 count_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1127 int *count = (int *)context;
1128 struct acpiphp_bridge *bridge;
1130 bridge = acpiphp_handle_to_bridge(handle);
1137 check_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1139 struct acpiphp_bridge *bridge;
1141 struct acpi_buffer buffer = { .length = sizeof(objname),
1142 .pointer = objname };
1144 bridge = acpiphp_handle_to_bridge(handle);
1146 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1147 dbg("%s: re-enumerating slots under %s\n",
1149 acpiphp_check_bridge(bridge);
1155 * handle_hotplug_event_bridge - handle ACPI event on bridges
1156 * @handle: Notify()'ed acpi_handle
1157 * @type: Notify code
1158 * @context: pointer to acpiphp_bridge structure
1160 * Handles ACPI event notification on {host,p2p} bridges.
1162 static void handle_hotplug_event_bridge(acpi_handle handle, u32 type, void *context)
1164 struct acpiphp_bridge *bridge;
1166 struct acpi_buffer buffer = { .length = sizeof(objname),
1167 .pointer = objname };
1168 struct acpi_device *device;
1169 int num_sub_bridges = 0;
1171 if (acpi_bus_get_device(handle, &device)) {
1172 /* This bridge must have just been physically inserted */
1173 handle_bridge_insertion(handle, type);
1177 bridge = acpiphp_handle_to_bridge(handle);
1178 if (type == ACPI_NOTIFY_BUS_CHECK) {
1179 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, ACPI_UINT32_MAX,
1180 count_sub_bridges, &num_sub_bridges, NULL);
1183 if (!bridge && !num_sub_bridges) {
1184 err("cannot get bridge info\n");
1188 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1191 case ACPI_NOTIFY_BUS_CHECK:
1192 /* bus re-enumerate */
1193 dbg("%s: Bus check notify on %s\n", __func__, objname);
1195 dbg("%s: re-enumerating slots under %s\n",
1197 acpiphp_check_bridge(bridge);
1199 if (num_sub_bridges)
1200 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
1201 ACPI_UINT32_MAX, check_sub_bridges, NULL, NULL);
1204 case ACPI_NOTIFY_DEVICE_CHECK:
1206 dbg("%s: Device check notify on %s\n", __func__, objname);
1207 acpiphp_check_bridge(bridge);
1210 case ACPI_NOTIFY_DEVICE_WAKE:
1212 dbg("%s: Device wake notify on %s\n", __func__, objname);
1215 case ACPI_NOTIFY_EJECT_REQUEST:
1216 /* request device eject */
1217 dbg("%s: Device eject notify on %s\n", __func__, objname);
1218 if ((bridge->type != BRIDGE_TYPE_HOST) &&
1219 (bridge->flags & BRIDGE_HAS_EJ0)) {
1220 struct acpiphp_slot *slot;
1221 slot = bridge->func->slot;
1222 if (!acpiphp_disable_slot(slot))
1223 acpiphp_eject_slot(slot);
1227 case ACPI_NOTIFY_FREQUENCY_MISMATCH:
1228 printk(KERN_ERR "Device %s cannot be configured due"
1229 " to a frequency mismatch\n", objname);
1232 case ACPI_NOTIFY_BUS_MODE_MISMATCH:
1233 printk(KERN_ERR "Device %s cannot be configured due"
1234 " to a bus mode mismatch\n", objname);
1237 case ACPI_NOTIFY_POWER_FAULT:
1238 printk(KERN_ERR "Device %s has suffered a power fault\n",
1243 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
1249 * handle_hotplug_event_func - handle ACPI event on functions (i.e. slots)
1250 * @handle: Notify()'ed acpi_handle
1251 * @type: Notify code
1252 * @context: pointer to acpiphp_func structure
1254 * Handles ACPI event notification on slots.
1256 static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context)
1258 struct acpiphp_func *func;
1260 struct acpi_buffer buffer = { .length = sizeof(objname),
1261 .pointer = objname };
1263 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1265 func = (struct acpiphp_func *)context;
1268 case ACPI_NOTIFY_BUS_CHECK:
1269 /* bus re-enumerate */
1270 dbg("%s: Bus check notify on %s\n", __func__, objname);
1271 acpiphp_enable_slot(func->slot);
1274 case ACPI_NOTIFY_DEVICE_CHECK:
1275 /* device check : re-enumerate from parent bus */
1276 dbg("%s: Device check notify on %s\n", __func__, objname);
1277 acpiphp_check_bridge(func->slot->bridge);
1280 case ACPI_NOTIFY_DEVICE_WAKE:
1282 dbg("%s: Device wake notify on %s\n", __func__, objname);
1285 case ACPI_NOTIFY_EJECT_REQUEST:
1286 /* request device eject */
1287 dbg("%s: Device eject notify on %s\n", __func__, objname);
1288 if (!(acpiphp_disable_slot(func->slot)))
1289 acpiphp_eject_slot(func->slot);
1293 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
1300 find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1302 int *count = (int *)context;
1304 if (acpi_is_root_bridge(handle)) {
1305 acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
1306 handle_hotplug_event_bridge, NULL);
1312 static struct acpi_pci_driver acpi_pci_hp_driver = {
1314 .remove = remove_bridge,
1318 * acpiphp_glue_init - initializes all PCI hotplug - ACPI glue data structures
1320 int __init acpiphp_glue_init(void)
1324 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
1325 ACPI_UINT32_MAX, find_root_bridges, &num, NULL);
1330 acpi_pci_register_driver(&acpi_pci_hp_driver);
1337 * acpiphp_glue_exit - terminates all PCI hotplug - ACPI glue data structures
1339 * This function frees all data allocated in acpiphp_glue_init().
1341 void acpiphp_glue_exit(void)
1343 acpi_pci_unregister_driver(&acpi_pci_hp_driver);
1348 * acpiphp_get_num_slots - count number of slots in a system
1350 int __init acpiphp_get_num_slots(void)
1352 struct acpiphp_bridge *bridge;
1355 list_for_each_entry (bridge, &bridge_list, list) {
1356 dbg("Bus %04x:%02x has %d slot%s\n",
1357 pci_domain_nr(bridge->pci_bus),
1358 bridge->pci_bus->number, bridge->nr_slots,
1359 bridge->nr_slots == 1 ? "" : "s");
1360 num_slots += bridge->nr_slots;
1363 dbg("Total %d slots\n", num_slots);
1370 * acpiphp_for_each_slot - call function for each slot
1371 * @fn: callback function
1372 * @data: context to be passed to callback function
1374 static int acpiphp_for_each_slot(acpiphp_callback fn, void *data)
1376 struct list_head *node;
1377 struct acpiphp_bridge *bridge;
1378 struct acpiphp_slot *slot;
1381 list_for_each (node, &bridge_list) {
1382 bridge = (struct acpiphp_bridge *)node;
1383 for (slot = bridge->slots; slot; slot = slot->next) {
1384 retval = fn(slot, data);
1397 * acpiphp_enable_slot - power on slot
1398 * @slot: ACPI PHP slot
1400 int acpiphp_enable_slot(struct acpiphp_slot *slot)
1404 mutex_lock(&slot->crit_sect);
1406 /* wake up all functions */
1407 retval = power_on_slot(slot);
1411 if (get_slot_status(slot) == ACPI_STA_ALL) {
1412 /* configure all functions */
1413 retval = enable_device(slot);
1415 power_off_slot(slot);
1417 dbg("%s: Slot status is not ACPI_STA_ALL\n", __func__);
1418 power_off_slot(slot);
1422 mutex_unlock(&slot->crit_sect);
1427 * acpiphp_disable_slot - power off slot
1428 * @slot: ACPI PHP slot
1430 int acpiphp_disable_slot(struct acpiphp_slot *slot)
1434 mutex_lock(&slot->crit_sect);
1436 /* unconfigure all functions */
1437 retval = disable_device(slot);
1441 /* power off all functions */
1442 retval = power_off_slot(slot);
1447 mutex_unlock(&slot->crit_sect);
1456 u8 acpiphp_get_power_status(struct acpiphp_slot *slot)
1458 return (slot->flags & SLOT_POWEREDON);
1466 u8 acpiphp_get_latch_status(struct acpiphp_slot *slot)
1470 sta = get_slot_status(slot);
1472 return (sta & ACPI_STA_SHOW_IN_UI) ? 0 : 1;
1477 * adapter presence : 1
1480 u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot)
1484 sta = get_slot_status(slot);
1486 return (sta == 0) ? 0 : 1;