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, NULL, (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, NULL, 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 acpiphp_bridge *bridge;
313 struct acpiphp_slot *slot;
314 struct acpiphp_func *func;
316 list_for_each_entry(bridge, &bridge_list, list) {
317 for (slot = bridge->slots; slot; slot = slot->next) {
318 list_for_each_entry(func, &slot->funcs, sibling) {
319 if (func->handle == handle)
329 static inline void config_p2p_bridge_flags(struct acpiphp_bridge *bridge)
331 acpi_handle dummy_handle;
333 if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
334 "_STA", &dummy_handle)))
335 bridge->flags |= BRIDGE_HAS_STA;
337 if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
338 "_EJ0", &dummy_handle)))
339 bridge->flags |= BRIDGE_HAS_EJ0;
341 if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
342 "_PS0", &dummy_handle)))
343 bridge->flags |= BRIDGE_HAS_PS0;
345 if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
346 "_PS3", &dummy_handle)))
347 bridge->flags |= BRIDGE_HAS_PS3;
349 /* is this ejectable p2p bridge? */
350 if (bridge->flags & BRIDGE_HAS_EJ0) {
351 struct acpiphp_func *func;
353 dbg("found ejectable p2p bridge\n");
355 /* make link between PCI bridge and PCI function */
356 func = acpiphp_bridge_handle_to_function(bridge->handle);
360 func->bridge = bridge;
365 /* allocate and initialize host bridge data structure */
366 static void add_host_bridge(acpi_handle *handle)
368 struct acpiphp_bridge *bridge;
369 struct acpi_pci_root *root = acpi_pci_find_root(handle);
371 bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
375 bridge->type = BRIDGE_TYPE_HOST;
376 bridge->handle = handle;
378 bridge->pci_bus = root->bus;
380 spin_lock_init(&bridge->res_lock);
382 init_bridge_misc(bridge);
386 /* allocate and initialize PCI-to-PCI bridge data structure */
387 static void add_p2p_bridge(acpi_handle *handle)
389 struct acpiphp_bridge *bridge;
391 bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
392 if (bridge == NULL) {
393 err("out of memory\n");
397 bridge->type = BRIDGE_TYPE_P2P;
398 bridge->handle = handle;
399 config_p2p_bridge_flags(bridge);
401 bridge->pci_dev = acpi_get_pci_dev(handle);
402 bridge->pci_bus = bridge->pci_dev->subordinate;
403 if (!bridge->pci_bus) {
404 err("This is not a PCI-to-PCI bridge!\n");
409 * Grab a ref to the subordinate PCI bus in case the bus is
410 * removed via PCI core logical hotplug. The ref pins the bus
411 * (which we access during module unload).
413 get_device(&bridge->pci_bus->dev);
414 spin_lock_init(&bridge->res_lock);
416 init_bridge_misc(bridge);
419 pci_dev_put(bridge->pci_dev);
425 /* callback routine to find P2P bridges */
427 find_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
432 dev = acpi_get_pci_dev(handle);
433 if (!dev || !dev->subordinate)
436 /* check if this bridge has ejectable slots */
437 if ((detect_ejectable_slots(handle) > 0)) {
438 dbg("found PCI-to-PCI bridge at PCI %s\n", pci_name(dev));
439 add_p2p_bridge(handle);
442 /* search P2P bridges under this p2p bridge */
443 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
444 find_p2p_bridge, NULL, NULL, NULL);
445 if (ACPI_FAILURE(status))
446 warn("find_p2p_bridge failed (error code = 0x%x)\n", status);
454 /* find hot-pluggable slots, and then find P2P bridge */
455 static int add_bridge(acpi_handle handle)
458 unsigned long long tmp;
459 acpi_handle dummy_handle;
461 /* if the bridge doesn't have _STA, we assume it is always there */
462 status = acpi_get_handle(handle, "_STA", &dummy_handle);
463 if (ACPI_SUCCESS(status)) {
464 status = acpi_evaluate_integer(handle, "_STA", NULL, &tmp);
465 if (ACPI_FAILURE(status)) {
466 dbg("%s: _STA evaluation failure\n", __func__);
469 if ((tmp & ACPI_STA_FUNCTIONING) == 0)
470 /* don't register this object */
474 /* check if this bridge has ejectable slots */
475 if (detect_ejectable_slots(handle) > 0) {
476 dbg("found PCI host-bus bridge with hot-pluggable slots\n");
477 add_host_bridge(handle);
480 /* search P2P bridges under this host bridge */
481 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
482 find_p2p_bridge, NULL, NULL, NULL);
484 if (ACPI_FAILURE(status))
485 warn("find_p2p_bridge failed (error code = 0x%x)\n", status);
490 static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle)
492 struct acpiphp_bridge *bridge;
494 list_for_each_entry(bridge, &bridge_list, list)
495 if (bridge->handle == handle)
501 static void cleanup_bridge(struct acpiphp_bridge *bridge)
503 struct acpiphp_slot *slot, *next;
504 struct acpiphp_func *func, *tmp;
506 acpi_handle handle = bridge->handle;
508 status = acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
509 handle_hotplug_event_bridge);
510 if (ACPI_FAILURE(status))
511 err("failed to remove notify handler\n");
513 if ((bridge->type != BRIDGE_TYPE_HOST) &&
514 ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func)) {
515 status = acpi_install_notify_handler(bridge->func->handle,
517 handle_hotplug_event_func,
519 if (ACPI_FAILURE(status))
520 err("failed to install interrupt notify handler\n");
523 slot = bridge->slots;
526 list_for_each_entry_safe(func, tmp, &slot->funcs, sibling) {
527 if (is_dock_device(func->handle)) {
528 unregister_hotplug_dock_device(func->handle);
529 unregister_dock_notifier(&func->nb);
531 if (!(func->flags & FUNC_HAS_DCK)) {
532 status = acpi_remove_notify_handler(func->handle,
534 handle_hotplug_event_func);
535 if (ACPI_FAILURE(status))
536 err("failed to remove notify handler\n");
538 list_del(&func->sibling);
541 acpiphp_unregister_hotplug_slot(slot);
542 list_del(&slot->funcs);
548 * Only P2P bridges have a pci_dev
551 put_device(&bridge->pci_bus->dev);
553 pci_dev_put(bridge->pci_dev);
554 list_del(&bridge->list);
559 cleanup_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
561 struct acpiphp_bridge *bridge;
563 /* cleanup p2p bridges under this P2P bridge
564 in a depth-first manner */
565 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
566 cleanup_p2p_bridge, NULL, NULL, NULL);
568 bridge = acpiphp_handle_to_bridge(handle);
570 cleanup_bridge(bridge);
575 static void remove_bridge(acpi_handle handle)
577 struct acpiphp_bridge *bridge;
579 /* cleanup p2p bridges under this host bridge
580 in a depth-first manner */
581 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
582 (u32)1, cleanup_p2p_bridge, NULL, NULL, NULL);
585 * On root bridges with hotplug slots directly underneath (ie,
586 * no p2p bridge inbetween), we call cleanup_bridge().
588 * The else clause cleans up root bridges that either had no
589 * hotplug slots at all, or had a p2p bridge underneath.
591 bridge = acpiphp_handle_to_bridge(handle);
593 cleanup_bridge(bridge);
595 acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
596 handle_hotplug_event_bridge);
599 static int power_on_slot(struct acpiphp_slot *slot)
602 struct acpiphp_func *func;
605 /* if already enabled, just skip */
606 if (slot->flags & SLOT_POWEREDON)
609 list_for_each_entry(func, &slot->funcs, sibling) {
610 if (func->flags & FUNC_HAS_PS0) {
611 dbg("%s: executing _PS0\n", __func__);
612 status = acpi_evaluate_object(func->handle, "_PS0", NULL, NULL);
613 if (ACPI_FAILURE(status)) {
614 warn("%s: _PS0 failed\n", __func__);
622 /* TBD: evaluate _STA to check if the slot is enabled */
624 slot->flags |= SLOT_POWEREDON;
631 static int power_off_slot(struct acpiphp_slot *slot)
634 struct acpiphp_func *func;
638 /* if already disabled, just skip */
639 if ((slot->flags & SLOT_POWEREDON) == 0)
642 list_for_each_entry(func, &slot->funcs, sibling) {
643 if (func->flags & FUNC_HAS_PS3) {
644 status = acpi_evaluate_object(func->handle, "_PS3", NULL, NULL);
645 if (ACPI_FAILURE(status)) {
646 warn("%s: _PS3 failed\n", __func__);
654 /* TBD: evaluate _STA to check if the slot is disabled */
656 slot->flags &= (~SLOT_POWEREDON);
665 * acpiphp_max_busnr - return the highest reserved bus number under the given bus.
666 * @bus: bus to start search with
668 static unsigned char acpiphp_max_busnr(struct pci_bus *bus)
670 struct list_head *tmp;
671 unsigned char max, n;
674 * pci_bus_max_busnr will return the highest
675 * reserved busnr for all these children.
676 * that is equivalent to the bus->subordinate
677 * value. We don't want to use the parent's
678 * bus->subordinate value because it could have
681 max = bus->secondary;
683 list_for_each(tmp, &bus->children) {
684 n = pci_bus_max_busnr(pci_bus_b(tmp));
693 * acpiphp_bus_add - add a new bus to acpi subsystem
694 * @func: acpiphp_func of the bridge
696 static int acpiphp_bus_add(struct acpiphp_func *func)
699 struct acpi_device *device, *pdevice;
702 acpi_get_parent(func->handle, &phandle);
703 if (acpi_bus_get_device(phandle, &pdevice)) {
704 dbg("no parent device, assuming NULL\n");
707 if (!acpi_bus_get_device(func->handle, &device)) {
708 dbg("bus exists... trim\n");
709 /* this shouldn't be in here, so remove
710 * the bus then re-add it...
712 ret_val = acpi_bus_trim(device, 1);
713 dbg("acpi_bus_trim return %x\n", ret_val);
716 ret_val = acpi_bus_add(&device, pdevice, func->handle,
717 ACPI_BUS_TYPE_DEVICE);
719 dbg("error adding bus, %x\n",
721 goto acpiphp_bus_add_out;
724 * try to start anyway. We could have failed to add
725 * simply because this bus had previously been added
726 * on another add. Don't bother with the return value
727 * we just keep going.
729 ret_val = acpi_bus_start(device);
737 * acpiphp_bus_trim - trim a bus from acpi subsystem
738 * @handle: handle to acpi namespace
740 static int acpiphp_bus_trim(acpi_handle handle)
742 struct acpi_device *device;
745 retval = acpi_bus_get_device(handle, &device);
747 dbg("acpi_device not found\n");
751 retval = acpi_bus_trim(device, 1);
753 err("cannot remove from acpi list\n");
759 * enable_device - enable, configure a slot
760 * @slot: slot to be enabled
762 * This function should be called per *physical slot*,
763 * not per each slot object in ACPI namespace.
765 static int __ref enable_device(struct acpiphp_slot *slot)
768 struct pci_bus *bus = slot->bridge->pci_bus;
769 struct acpiphp_func *func;
774 if (slot->flags & SLOT_ENABLED)
777 /* sanity check: dev should be NULL when hot-plugged in */
778 dev = pci_get_slot(bus, PCI_DEVFN(slot->device, 0));
780 /* This case shouldn't happen */
781 err("pci_dev structure already exists.\n");
787 num = pci_scan_slot(bus, PCI_DEVFN(slot->device, 0));
789 err("No new device found\n");
794 max = acpiphp_max_busnr(bus);
795 for (pass = 0; pass < 2; pass++) {
796 list_for_each_entry(dev, &bus->devices, bus_list) {
797 if (PCI_SLOT(dev->devfn) != slot->device)
799 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
800 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
801 max = pci_scan_bridge(bus, dev, max, pass);
802 if (pass && dev->subordinate)
803 pci_bus_size_bridges(dev->subordinate);
808 list_for_each_entry(func, &slot->funcs, sibling)
809 acpiphp_bus_add(func);
811 pci_bus_assign_resources(bus);
812 acpiphp_sanitize_bus(bus);
813 acpiphp_set_hpp_values(bus);
814 pci_enable_bridges(bus);
815 pci_bus_add_devices(bus);
817 list_for_each_entry(func, &slot->funcs, sibling) {
818 dev = pci_get_slot(bus, PCI_DEVFN(slot->device,
823 if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE &&
824 dev->hdr_type != PCI_HEADER_TYPE_CARDBUS) {
829 status = find_p2p_bridge(func->handle, (u32)1, bus, NULL);
830 if (ACPI_FAILURE(status))
831 warn("find_p2p_bridge failed (error code = 0x%x)\n",
836 slot->flags |= SLOT_ENABLED;
842 static void disable_bridges(struct pci_bus *bus)
845 list_for_each_entry(dev, &bus->devices, bus_list) {
846 if (dev->subordinate) {
847 disable_bridges(dev->subordinate);
848 pci_disable_device(dev);
854 * disable_device - disable a slot
855 * @slot: ACPI PHP slot
857 static int disable_device(struct acpiphp_slot *slot)
859 struct acpiphp_func *func;
860 struct pci_dev *pdev;
862 /* is this slot already disabled? */
863 if (!(slot->flags & SLOT_ENABLED))
866 list_for_each_entry(func, &slot->funcs, sibling) {
868 /* cleanup p2p bridges under this P2P bridge */
869 cleanup_p2p_bridge(func->bridge->handle,
874 pdev = pci_get_slot(slot->bridge->pci_bus,
875 PCI_DEVFN(slot->device, func->function));
877 pci_stop_bus_device(pdev);
878 if (pdev->subordinate) {
879 disable_bridges(pdev->subordinate);
880 pci_disable_device(pdev);
882 pci_remove_bus_device(pdev);
887 list_for_each_entry(func, &slot->funcs, sibling) {
888 acpiphp_bus_trim(func->handle);
891 slot->flags &= (~SLOT_ENABLED);
899 * get_slot_status - get ACPI slot status
900 * @slot: ACPI PHP slot
902 * If a slot has _STA for each function and if any one of them
903 * returned non-zero status, return it.
905 * If a slot doesn't have _STA and if any one of its functions'
906 * configuration space is configured, return 0x0f as a _STA.
908 * Otherwise return 0.
910 static unsigned int get_slot_status(struct acpiphp_slot *slot)
913 unsigned long long sta = 0;
915 struct acpiphp_func *func;
917 list_for_each_entry(func, &slot->funcs, sibling) {
918 if (func->flags & FUNC_HAS_STA) {
919 status = acpi_evaluate_integer(func->handle, "_STA", NULL, &sta);
920 if (ACPI_SUCCESS(status) && sta)
923 pci_bus_read_config_dword(slot->bridge->pci_bus,
924 PCI_DEVFN(slot->device,
926 PCI_VENDOR_ID, &dvid);
927 if (dvid != 0xffffffff) {
934 return (unsigned int)sta;
938 * acpiphp_eject_slot - physically eject the slot
939 * @slot: ACPI PHP slot
941 int acpiphp_eject_slot(struct acpiphp_slot *slot)
944 struct acpiphp_func *func;
945 struct acpi_object_list arg_list;
946 union acpi_object arg;
948 list_for_each_entry(func, &slot->funcs, sibling) {
949 /* We don't want to call _EJ0 on non-existing functions. */
950 if ((func->flags & FUNC_HAS_EJ0)) {
951 /* _EJ0 method take one argument */
953 arg_list.pointer = &arg;
954 arg.type = ACPI_TYPE_INTEGER;
955 arg.integer.value = 1;
957 status = acpi_evaluate_object(func->handle, "_EJ0", &arg_list, NULL);
958 if (ACPI_FAILURE(status)) {
959 warn("%s: _EJ0 failed\n", __func__);
969 * acpiphp_check_bridge - re-enumerate devices
970 * @bridge: where to begin re-enumeration
972 * Iterate over all slots under this bridge and make sure that if a
973 * card is present they are enabled, and if not they are disabled.
975 static int acpiphp_check_bridge(struct acpiphp_bridge *bridge)
977 struct acpiphp_slot *slot;
979 int enabled, disabled;
981 enabled = disabled = 0;
983 for (slot = bridge->slots; slot; slot = slot->next) {
984 unsigned int status = get_slot_status(slot);
985 if (slot->flags & SLOT_ENABLED) {
986 if (status == ACPI_STA_ALL)
988 retval = acpiphp_disable_slot(slot);
990 err("Error occurred in disabling\n");
993 acpiphp_eject_slot(slot);
997 if (status != ACPI_STA_ALL)
999 retval = acpiphp_enable_slot(slot);
1001 err("Error occurred in enabling\n");
1008 dbg("%s: %d enabled, %d disabled\n", __func__, enabled, disabled);
1014 static void acpiphp_set_hpp_values(struct pci_bus *bus)
1016 struct pci_dev *dev;
1018 list_for_each_entry(dev, &bus->devices, bus_list)
1019 pci_configure_slot(dev);
1023 * Remove devices for which we could not assign resources, call
1024 * arch specific code to fix-up the bus
1026 static void acpiphp_sanitize_bus(struct pci_bus *bus)
1028 struct pci_dev *dev;
1030 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM;
1032 list_for_each_entry(dev, &bus->devices, bus_list) {
1033 for (i=0; i<PCI_BRIDGE_RESOURCES; i++) {
1034 struct resource *res = &dev->resource[i];
1035 if ((res->flags & type_mask) && !res->start &&
1037 /* Could not assign a required resources
1038 * for this device, remove it */
1039 pci_remove_bus_device(dev);
1046 /* Program resources in newly inserted bridge */
1047 static int acpiphp_configure_bridge (acpi_handle handle)
1049 struct pci_bus *bus;
1051 if (acpi_is_root_bridge(handle)) {
1052 struct acpi_pci_root *root = acpi_pci_find_root(handle);
1055 struct pci_dev *pdev = acpi_get_pci_dev(handle);
1056 bus = pdev->subordinate;
1060 pci_bus_size_bridges(bus);
1061 pci_bus_assign_resources(bus);
1062 acpiphp_sanitize_bus(bus);
1063 acpiphp_set_hpp_values(bus);
1064 pci_enable_bridges(bus);
1068 static void handle_bridge_insertion(acpi_handle handle, u32 type)
1070 struct acpi_device *device, *pdevice;
1071 acpi_handle phandle;
1073 if ((type != ACPI_NOTIFY_BUS_CHECK) &&
1074 (type != ACPI_NOTIFY_DEVICE_CHECK)) {
1075 err("unexpected notification type %d\n", type);
1079 acpi_get_parent(handle, &phandle);
1080 if (acpi_bus_get_device(phandle, &pdevice)) {
1081 dbg("no parent device, assuming NULL\n");
1084 if (acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE)) {
1085 err("cannot add bridge to acpi list\n");
1088 if (!acpiphp_configure_bridge(handle) &&
1089 !acpi_bus_start(device))
1092 err("cannot configure and start bridge\n");
1097 * ACPI event handlers
1101 count_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1103 int *count = (int *)context;
1104 struct acpiphp_bridge *bridge;
1106 bridge = acpiphp_handle_to_bridge(handle);
1113 check_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1115 struct acpiphp_bridge *bridge;
1117 struct acpi_buffer buffer = { .length = sizeof(objname),
1118 .pointer = objname };
1120 bridge = acpiphp_handle_to_bridge(handle);
1122 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1123 dbg("%s: re-enumerating slots under %s\n",
1125 acpiphp_check_bridge(bridge);
1131 * handle_hotplug_event_bridge - handle ACPI event on bridges
1132 * @handle: Notify()'ed acpi_handle
1133 * @type: Notify code
1134 * @context: pointer to acpiphp_bridge structure
1136 * Handles ACPI event notification on {host,p2p} bridges.
1138 static void handle_hotplug_event_bridge(acpi_handle handle, u32 type, void *context)
1140 struct acpiphp_bridge *bridge;
1142 struct acpi_buffer buffer = { .length = sizeof(objname),
1143 .pointer = objname };
1144 struct acpi_device *device;
1145 int num_sub_bridges = 0;
1147 if (acpi_bus_get_device(handle, &device)) {
1148 /* This bridge must have just been physically inserted */
1149 handle_bridge_insertion(handle, type);
1153 bridge = acpiphp_handle_to_bridge(handle);
1154 if (type == ACPI_NOTIFY_BUS_CHECK) {
1155 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, ACPI_UINT32_MAX,
1156 count_sub_bridges, NULL, &num_sub_bridges, NULL);
1159 if (!bridge && !num_sub_bridges) {
1160 err("cannot get bridge info\n");
1164 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1167 case ACPI_NOTIFY_BUS_CHECK:
1168 /* bus re-enumerate */
1169 dbg("%s: Bus check notify on %s\n", __func__, objname);
1171 dbg("%s: re-enumerating slots under %s\n",
1173 acpiphp_check_bridge(bridge);
1175 if (num_sub_bridges)
1176 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
1177 ACPI_UINT32_MAX, check_sub_bridges, NULL, NULL, NULL);
1180 case ACPI_NOTIFY_DEVICE_CHECK:
1182 dbg("%s: Device check notify on %s\n", __func__, objname);
1183 acpiphp_check_bridge(bridge);
1186 case ACPI_NOTIFY_DEVICE_WAKE:
1188 dbg("%s: Device wake notify on %s\n", __func__, objname);
1191 case ACPI_NOTIFY_EJECT_REQUEST:
1192 /* request device eject */
1193 dbg("%s: Device eject notify on %s\n", __func__, objname);
1194 if ((bridge->type != BRIDGE_TYPE_HOST) &&
1195 (bridge->flags & BRIDGE_HAS_EJ0)) {
1196 struct acpiphp_slot *slot;
1197 slot = bridge->func->slot;
1198 if (!acpiphp_disable_slot(slot))
1199 acpiphp_eject_slot(slot);
1203 case ACPI_NOTIFY_FREQUENCY_MISMATCH:
1204 printk(KERN_ERR "Device %s cannot be configured due"
1205 " to a frequency mismatch\n", objname);
1208 case ACPI_NOTIFY_BUS_MODE_MISMATCH:
1209 printk(KERN_ERR "Device %s cannot be configured due"
1210 " to a bus mode mismatch\n", objname);
1213 case ACPI_NOTIFY_POWER_FAULT:
1214 printk(KERN_ERR "Device %s has suffered a power fault\n",
1219 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
1225 * handle_hotplug_event_func - handle ACPI event on functions (i.e. slots)
1226 * @handle: Notify()'ed acpi_handle
1227 * @type: Notify code
1228 * @context: pointer to acpiphp_func structure
1230 * Handles ACPI event notification on slots.
1232 static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context)
1234 struct acpiphp_func *func;
1236 struct acpi_buffer buffer = { .length = sizeof(objname),
1237 .pointer = objname };
1239 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1241 func = (struct acpiphp_func *)context;
1244 case ACPI_NOTIFY_BUS_CHECK:
1245 /* bus re-enumerate */
1246 dbg("%s: Bus check notify on %s\n", __func__, objname);
1247 acpiphp_enable_slot(func->slot);
1250 case ACPI_NOTIFY_DEVICE_CHECK:
1251 /* device check : re-enumerate from parent bus */
1252 dbg("%s: Device check notify on %s\n", __func__, objname);
1253 acpiphp_check_bridge(func->slot->bridge);
1256 case ACPI_NOTIFY_DEVICE_WAKE:
1258 dbg("%s: Device wake notify on %s\n", __func__, objname);
1261 case ACPI_NOTIFY_EJECT_REQUEST:
1262 /* request device eject */
1263 dbg("%s: Device eject notify on %s\n", __func__, objname);
1264 if (!(acpiphp_disable_slot(func->slot)))
1265 acpiphp_eject_slot(func->slot);
1269 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
1276 find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1278 int *count = (int *)context;
1280 if (acpi_is_root_bridge(handle)) {
1281 acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
1282 handle_hotplug_event_bridge, NULL);
1288 static struct acpi_pci_driver acpi_pci_hp_driver = {
1290 .remove = remove_bridge,
1294 * acpiphp_glue_init - initializes all PCI hotplug - ACPI glue data structures
1296 int __init acpiphp_glue_init(void)
1300 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
1301 ACPI_UINT32_MAX, find_root_bridges, NULL, &num, NULL);
1306 acpi_pci_register_driver(&acpi_pci_hp_driver);
1313 * acpiphp_glue_exit - terminates all PCI hotplug - ACPI glue data structures
1315 * This function frees all data allocated in acpiphp_glue_init().
1317 void acpiphp_glue_exit(void)
1319 acpi_pci_unregister_driver(&acpi_pci_hp_driver);
1324 * acpiphp_get_num_slots - count number of slots in a system
1326 int __init acpiphp_get_num_slots(void)
1328 struct acpiphp_bridge *bridge;
1331 list_for_each_entry(bridge, &bridge_list, list) {
1332 dbg("Bus %04x:%02x has %d slot%s\n",
1333 pci_domain_nr(bridge->pci_bus),
1334 bridge->pci_bus->number, bridge->nr_slots,
1335 bridge->nr_slots == 1 ? "" : "s");
1336 num_slots += bridge->nr_slots;
1339 dbg("Total %d slots\n", num_slots);
1346 * acpiphp_for_each_slot - call function for each slot
1347 * @fn: callback function
1348 * @data: context to be passed to callback function
1350 static int acpiphp_for_each_slot(acpiphp_callback fn, void *data)
1352 struct list_head *node;
1353 struct acpiphp_bridge *bridge;
1354 struct acpiphp_slot *slot;
1357 list_for_each (node, &bridge_list) {
1358 bridge = (struct acpiphp_bridge *)node;
1359 for (slot = bridge->slots; slot; slot = slot->next) {
1360 retval = fn(slot, data);
1373 * acpiphp_enable_slot - power on slot
1374 * @slot: ACPI PHP slot
1376 int acpiphp_enable_slot(struct acpiphp_slot *slot)
1380 mutex_lock(&slot->crit_sect);
1382 /* wake up all functions */
1383 retval = power_on_slot(slot);
1387 if (get_slot_status(slot) == ACPI_STA_ALL) {
1388 /* configure all functions */
1389 retval = enable_device(slot);
1391 power_off_slot(slot);
1393 dbg("%s: Slot status is not ACPI_STA_ALL\n", __func__);
1394 power_off_slot(slot);
1398 mutex_unlock(&slot->crit_sect);
1403 * acpiphp_disable_slot - power off slot
1404 * @slot: ACPI PHP slot
1406 int acpiphp_disable_slot(struct acpiphp_slot *slot)
1410 mutex_lock(&slot->crit_sect);
1412 /* unconfigure all functions */
1413 retval = disable_device(slot);
1417 /* power off all functions */
1418 retval = power_off_slot(slot);
1423 mutex_unlock(&slot->crit_sect);
1432 u8 acpiphp_get_power_status(struct acpiphp_slot *slot)
1434 return (slot->flags & SLOT_POWEREDON);
1442 u8 acpiphp_get_latch_status(struct acpiphp_slot *slot)
1446 sta = get_slot_status(slot);
1448 return (sta & ACPI_STA_SHOW_IN_UI) ? 0 : 1;
1453 * adapter presence : 1
1456 u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot)
1460 sta = get_slot_status(slot);
1462 return (sta == 0) ? 0 : 1;