2 * ACPI PCI HotPlug glue functions to ACPI CA subsystem
4 * Copyright (C) 2002,2003 Takayoshi Kochi (t-kochi@bq.jp.nec.com)
5 * Copyright (C) 2002 Hiroshi Aono (h-aono@ap.jp.nec.com)
6 * Copyright (C) 2002,2003 NEC Corporation
7 * Copyright (C) 2003-2005 Matthew Wilcox (matthew.wilcox@hp.com)
8 * Copyright (C) 2003-2005 Hewlett Packard
9 * Copyright (C) 2005 Rajesh Shah (rajesh.shah@intel.com)
10 * Copyright (C) 2005 Intel Corporation
12 * All rights reserved.
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or (at
17 * your option) any later version.
19 * This program is distributed in the hope that it will be useful, but
20 * WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
22 * NON INFRINGEMENT. See the GNU General Public License for more
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, write to the Free Software
27 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
29 * Send feedback to <kristen.c.accardi@intel.com>
34 * Lifetime rules for pci_dev:
35 * - The one in acpiphp_bridge has its refcount elevated by pci_get_slot()
36 * when the bridge is scanned and it loses a refcount when the bridge
38 * - When a P2P bridge is present, we elevate the refcount on the subordinate
39 * bus. It loses the refcount when the the driver unloads.
42 #include <linux/init.h>
43 #include <linux/module.h>
45 #include <linux/kernel.h>
46 #include <linux/pci.h>
47 #include <linux/pci_hotplug.h>
48 #include <linux/pci-acpi.h>
49 #include <linux/mutex.h>
50 #include <linux/slab.h>
51 #include <linux/acpi.h>
56 static LIST_HEAD(bridge_list);
58 #define MY_NAME "acpiphp_glue"
60 static void handle_hotplug_event_bridge (acpi_handle, u32, void *);
61 static void acpiphp_sanitize_bus(struct pci_bus *bus);
62 static void acpiphp_set_hpp_values(struct pci_bus *bus);
63 static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context);
65 /* callback routine to check for the existence of a pci dock device */
67 is_pci_dock_device(acpi_handle handle, u32 lvl, void *context, void **rv)
69 int *count = (int *)context;
71 if (is_dock_device(handle)) {
73 return AE_CTRL_TERMINATE;
80 * the _DCK method can do funny things... and sometimes not
83 * TBD - figure out a way to only call fixups for
84 * systems that require them.
86 static int post_dock_fixups(struct notifier_block *nb, unsigned long val,
89 struct acpiphp_func *func = container_of(nb, struct acpiphp_func, nb);
90 struct pci_bus *bus = func->slot->bridge->pci_bus;
96 /* fixup bad _DCK function that rewrites
97 * secondary bridge on slot
99 pci_read_config_dword(bus->self,
103 if (((buses >> 8) & 0xff) != bus->secondary) {
104 buses = (buses & 0xff000000)
105 | ((unsigned int)(bus->primary) << 0)
106 | ((unsigned int)(bus->secondary) << 8)
107 | ((unsigned int)(bus->subordinate) << 16);
108 pci_write_config_dword(bus->self, PCI_PRIMARY_BUS, buses);
114 static const struct acpi_dock_ops acpiphp_dock_ops = {
115 .handler = handle_hotplug_event_func,
118 /* callback routine to register each ACPI PCI slot object */
120 register_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
122 struct acpiphp_bridge *bridge = (struct acpiphp_bridge *)context;
123 struct acpiphp_slot *slot;
124 struct acpiphp_func *newfunc;
126 acpi_status status = AE_OK;
127 unsigned long long adr, sun;
128 int device, function, retval;
129 struct pci_bus *pbus = bridge->pci_bus;
130 struct pci_dev *pdev;
132 if (!acpi_pci_check_ejectable(pbus, handle) && !is_dock_device(handle))
135 acpi_evaluate_integer(handle, "_ADR", NULL, &adr);
136 device = (adr >> 16) & 0xffff;
137 function = adr & 0xffff;
139 newfunc = kzalloc(sizeof(struct acpiphp_func), GFP_KERNEL);
143 INIT_LIST_HEAD(&newfunc->sibling);
144 newfunc->handle = handle;
145 newfunc->function = function;
147 if (ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp)))
148 newfunc->flags = FUNC_HAS_EJ0;
150 if (ACPI_SUCCESS(acpi_get_handle(handle, "_STA", &tmp)))
151 newfunc->flags |= FUNC_HAS_STA;
153 if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS0", &tmp)))
154 newfunc->flags |= FUNC_HAS_PS0;
156 if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS3", &tmp)))
157 newfunc->flags |= FUNC_HAS_PS3;
159 if (ACPI_SUCCESS(acpi_get_handle(handle, "_DCK", &tmp)))
160 newfunc->flags |= FUNC_HAS_DCK;
162 status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun);
163 if (ACPI_FAILURE(status)) {
165 * use the count of the number of slots we've found
166 * for the number of the slot
168 sun = bridge->nr_slots+1;
171 /* search for objects that share the same slot */
172 for (slot = bridge->slots; slot; slot = slot->next)
173 if (slot->device == device) {
174 if (slot->sun != sun)
175 warn("sibling found, but _SUN doesn't match!\n");
180 slot = kzalloc(sizeof(struct acpiphp_slot), GFP_KERNEL);
186 slot->bridge = bridge;
187 slot->device = device;
189 INIT_LIST_HEAD(&slot->funcs);
190 mutex_init(&slot->crit_sect);
192 slot->next = bridge->slots;
193 bridge->slots = slot;
197 dbg("found ACPI PCI Hotplug slot %llu at PCI %04x:%02x:%02x\n",
198 slot->sun, pci_domain_nr(pbus), pbus->number, device);
199 retval = acpiphp_register_hotplug_slot(slot);
201 if (retval == -EBUSY)
202 warn("Slot %llu already registered by another "
203 "hotplug driver\n", slot->sun);
205 warn("acpiphp_register_hotplug_slot failed "
206 "(err code = 0x%x)\n", retval);
211 newfunc->slot = slot;
212 list_add_tail(&newfunc->sibling, &slot->funcs);
214 pdev = pci_get_slot(pbus, PCI_DEVFN(device, function));
216 pdev->current_state = PCI_D0;
217 slot->flags |= (SLOT_ENABLED | SLOT_POWEREDON);
221 if (is_dock_device(handle)) {
222 /* we don't want to call this device's _EJ0
223 * because we want the dock notify handler
224 * to call it after it calls _DCK
226 newfunc->flags &= ~FUNC_HAS_EJ0;
227 if (register_hotplug_dock_device(handle,
228 &acpiphp_dock_ops, newfunc))
229 dbg("failed to register dock device\n");
231 /* we need to be notified when dock events happen
232 * outside of the hotplug operation, since we may
233 * need to do fixups before we can hotplug.
235 newfunc->nb.notifier_call = post_dock_fixups;
236 if (register_dock_notifier(&newfunc->nb))
237 dbg("failed to register a dock notifier");
240 /* install notify handler */
241 if (!(newfunc->flags & FUNC_HAS_DCK)) {
242 status = acpi_install_notify_handler(handle,
244 handle_hotplug_event_func,
247 if (ACPI_FAILURE(status))
248 err("failed to register interrupt notify handler\n");
256 bridge->slots = slot->next;
264 /* see if it's worth looking at this bridge */
265 static int detect_ejectable_slots(acpi_handle handle)
267 int found = acpi_pci_detect_ejectable(handle);
269 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
270 is_pci_dock_device, NULL, (void *)&found, NULL);
275 /* initialize miscellaneous stuff for both root and PCI-to-PCI bridge */
276 static void init_bridge_misc(struct acpiphp_bridge *bridge)
280 /* must be added to the list prior to calling register_slot */
281 list_add(&bridge->list, &bridge_list);
283 /* register all slot objects under this bridge */
284 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge->handle, (u32)1,
285 register_slot, NULL, bridge, NULL);
286 if (ACPI_FAILURE(status)) {
287 list_del(&bridge->list);
291 /* install notify handler */
292 if (bridge->type != BRIDGE_TYPE_HOST) {
293 if ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func) {
294 status = acpi_remove_notify_handler(bridge->func->handle,
296 handle_hotplug_event_func);
297 if (ACPI_FAILURE(status))
298 err("failed to remove notify handler\n");
300 status = acpi_install_notify_handler(bridge->handle,
302 handle_hotplug_event_bridge,
305 if (ACPI_FAILURE(status)) {
306 err("failed to register interrupt notify handler\n");
312 /* find acpiphp_func from acpiphp_bridge */
313 static struct acpiphp_func *acpiphp_bridge_handle_to_function(acpi_handle handle)
315 struct acpiphp_bridge *bridge;
316 struct acpiphp_slot *slot;
317 struct acpiphp_func *func;
319 list_for_each_entry(bridge, &bridge_list, list) {
320 for (slot = bridge->slots; slot; slot = slot->next) {
321 list_for_each_entry(func, &slot->funcs, sibling) {
322 if (func->handle == handle)
332 static inline void config_p2p_bridge_flags(struct acpiphp_bridge *bridge)
334 acpi_handle dummy_handle;
336 if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
337 "_STA", &dummy_handle)))
338 bridge->flags |= BRIDGE_HAS_STA;
340 if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
341 "_EJ0", &dummy_handle)))
342 bridge->flags |= BRIDGE_HAS_EJ0;
344 if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
345 "_PS0", &dummy_handle)))
346 bridge->flags |= BRIDGE_HAS_PS0;
348 if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
349 "_PS3", &dummy_handle)))
350 bridge->flags |= BRIDGE_HAS_PS3;
352 /* is this ejectable p2p bridge? */
353 if (bridge->flags & BRIDGE_HAS_EJ0) {
354 struct acpiphp_func *func;
356 dbg("found ejectable p2p bridge\n");
358 /* make link between PCI bridge and PCI function */
359 func = acpiphp_bridge_handle_to_function(bridge->handle);
363 func->bridge = bridge;
368 /* allocate and initialize host bridge data structure */
369 static void add_host_bridge(acpi_handle *handle)
371 struct acpiphp_bridge *bridge;
372 struct acpi_pci_root *root = acpi_pci_find_root(handle);
374 bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
378 bridge->type = BRIDGE_TYPE_HOST;
379 bridge->handle = handle;
381 bridge->pci_bus = root->bus;
383 spin_lock_init(&bridge->res_lock);
385 init_bridge_misc(bridge);
389 /* allocate and initialize PCI-to-PCI bridge data structure */
390 static void add_p2p_bridge(acpi_handle *handle)
392 struct acpiphp_bridge *bridge;
394 bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
395 if (bridge == NULL) {
396 err("out of memory\n");
400 bridge->type = BRIDGE_TYPE_P2P;
401 bridge->handle = handle;
402 config_p2p_bridge_flags(bridge);
404 bridge->pci_dev = acpi_get_pci_dev(handle);
405 bridge->pci_bus = bridge->pci_dev->subordinate;
406 if (!bridge->pci_bus) {
407 err("This is not a PCI-to-PCI bridge!\n");
412 * Grab a ref to the subordinate PCI bus in case the bus is
413 * removed via PCI core logical hotplug. The ref pins the bus
414 * (which we access during module unload).
416 get_device(&bridge->pci_bus->dev);
417 spin_lock_init(&bridge->res_lock);
419 init_bridge_misc(bridge);
422 pci_dev_put(bridge->pci_dev);
428 /* callback routine to find P2P bridges */
430 find_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
435 dev = acpi_get_pci_dev(handle);
436 if (!dev || !dev->subordinate)
439 /* check if this bridge has ejectable slots */
440 if ((detect_ejectable_slots(handle) > 0)) {
441 dbg("found PCI-to-PCI bridge at PCI %s\n", pci_name(dev));
442 add_p2p_bridge(handle);
445 /* search P2P bridges under this p2p bridge */
446 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
447 find_p2p_bridge, NULL, NULL, NULL);
448 if (ACPI_FAILURE(status))
449 warn("find_p2p_bridge failed (error code = 0x%x)\n", status);
457 /* find hot-pluggable slots, and then find P2P bridge */
458 static int add_bridge(acpi_handle handle)
461 unsigned long long tmp;
462 acpi_handle dummy_handle;
464 /* if the bridge doesn't have _STA, we assume it is always there */
465 status = acpi_get_handle(handle, "_STA", &dummy_handle);
466 if (ACPI_SUCCESS(status)) {
467 status = acpi_evaluate_integer(handle, "_STA", NULL, &tmp);
468 if (ACPI_FAILURE(status)) {
469 dbg("%s: _STA evaluation failure\n", __func__);
472 if ((tmp & ACPI_STA_FUNCTIONING) == 0)
473 /* don't register this object */
477 /* check if this bridge has ejectable slots */
478 if (detect_ejectable_slots(handle) > 0) {
479 dbg("found PCI host-bus bridge with hot-pluggable slots\n");
480 add_host_bridge(handle);
483 /* search P2P bridges under this host bridge */
484 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
485 find_p2p_bridge, NULL, NULL, NULL);
487 if (ACPI_FAILURE(status))
488 warn("find_p2p_bridge failed (error code = 0x%x)\n", status);
493 static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle)
495 struct acpiphp_bridge *bridge;
497 list_for_each_entry(bridge, &bridge_list, list)
498 if (bridge->handle == handle)
504 static void cleanup_bridge(struct acpiphp_bridge *bridge)
506 struct acpiphp_slot *slot, *next;
507 struct acpiphp_func *func, *tmp;
509 acpi_handle handle = bridge->handle;
511 status = acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
512 handle_hotplug_event_bridge);
513 if (ACPI_FAILURE(status))
514 err("failed to remove notify handler\n");
516 if ((bridge->type != BRIDGE_TYPE_HOST) &&
517 ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func)) {
518 status = acpi_install_notify_handler(bridge->func->handle,
520 handle_hotplug_event_func,
522 if (ACPI_FAILURE(status))
523 err("failed to install interrupt notify handler\n");
526 slot = bridge->slots;
529 list_for_each_entry_safe(func, tmp, &slot->funcs, sibling) {
530 if (is_dock_device(func->handle)) {
531 unregister_hotplug_dock_device(func->handle);
532 unregister_dock_notifier(&func->nb);
534 if (!(func->flags & FUNC_HAS_DCK)) {
535 status = acpi_remove_notify_handler(func->handle,
537 handle_hotplug_event_func);
538 if (ACPI_FAILURE(status))
539 err("failed to remove notify handler\n");
541 list_del(&func->sibling);
544 acpiphp_unregister_hotplug_slot(slot);
545 list_del(&slot->funcs);
551 * Only P2P bridges have a pci_dev
554 put_device(&bridge->pci_bus->dev);
556 pci_dev_put(bridge->pci_dev);
557 list_del(&bridge->list);
562 cleanup_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
564 struct acpiphp_bridge *bridge;
566 /* cleanup p2p bridges under this P2P bridge
567 in a depth-first manner */
568 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
569 cleanup_p2p_bridge, NULL, NULL, NULL);
571 bridge = acpiphp_handle_to_bridge(handle);
573 cleanup_bridge(bridge);
578 static void remove_bridge(acpi_handle handle)
580 struct acpiphp_bridge *bridge;
582 /* cleanup p2p bridges under this host bridge
583 in a depth-first manner */
584 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
585 (u32)1, cleanup_p2p_bridge, NULL, NULL, NULL);
588 * On root bridges with hotplug slots directly underneath (ie,
589 * no p2p bridge between), we call cleanup_bridge().
591 * The else clause cleans up root bridges that either had no
592 * hotplug slots at all, or had a p2p bridge underneath.
594 bridge = acpiphp_handle_to_bridge(handle);
596 cleanup_bridge(bridge);
598 acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
599 handle_hotplug_event_bridge);
602 static int power_on_slot(struct acpiphp_slot *slot)
605 struct acpiphp_func *func;
608 /* if already enabled, just skip */
609 if (slot->flags & SLOT_POWEREDON)
612 list_for_each_entry(func, &slot->funcs, sibling) {
613 if (func->flags & FUNC_HAS_PS0) {
614 dbg("%s: executing _PS0\n", __func__);
615 status = acpi_evaluate_object(func->handle, "_PS0", NULL, NULL);
616 if (ACPI_FAILURE(status)) {
617 warn("%s: _PS0 failed\n", __func__);
625 /* TBD: evaluate _STA to check if the slot is enabled */
627 slot->flags |= SLOT_POWEREDON;
634 static int power_off_slot(struct acpiphp_slot *slot)
637 struct acpiphp_func *func;
641 /* if already disabled, just skip */
642 if ((slot->flags & SLOT_POWEREDON) == 0)
645 list_for_each_entry(func, &slot->funcs, sibling) {
646 if (func->flags & FUNC_HAS_PS3) {
647 status = acpi_evaluate_object(func->handle, "_PS3", NULL, NULL);
648 if (ACPI_FAILURE(status)) {
649 warn("%s: _PS3 failed\n", __func__);
657 /* TBD: evaluate _STA to check if the slot is disabled */
659 slot->flags &= (~SLOT_POWEREDON);
668 * acpiphp_max_busnr - return the highest reserved bus number under the given bus.
669 * @bus: bus to start search with
671 static unsigned char acpiphp_max_busnr(struct pci_bus *bus)
673 struct list_head *tmp;
674 unsigned char max, n;
677 * pci_bus_max_busnr will return the highest
678 * reserved busnr for all these children.
679 * that is equivalent to the bus->subordinate
680 * value. We don't want to use the parent's
681 * bus->subordinate value because it could have
684 max = bus->secondary;
686 list_for_each(tmp, &bus->children) {
687 n = pci_bus_max_busnr(pci_bus_b(tmp));
696 * acpiphp_bus_add - add a new bus to acpi subsystem
697 * @func: acpiphp_func of the bridge
699 static int acpiphp_bus_add(struct acpiphp_func *func)
702 struct acpi_device *device, *pdevice;
705 acpi_get_parent(func->handle, &phandle);
706 if (acpi_bus_get_device(phandle, &pdevice)) {
707 dbg("no parent device, assuming NULL\n");
710 if (!acpi_bus_get_device(func->handle, &device)) {
711 dbg("bus exists... trim\n");
712 /* this shouldn't be in here, so remove
713 * the bus then re-add it...
715 ret_val = acpi_bus_trim(device, 1);
716 dbg("acpi_bus_trim return %x\n", ret_val);
719 ret_val = acpi_bus_add(&device, pdevice, func->handle,
720 ACPI_BUS_TYPE_DEVICE);
722 dbg("error adding bus, %x\n",
724 goto acpiphp_bus_add_out;
726 ret_val = acpi_bus_start(device);
734 * acpiphp_bus_trim - trim a bus from acpi subsystem
735 * @handle: handle to acpi namespace
737 static int acpiphp_bus_trim(acpi_handle handle)
739 struct acpi_device *device;
742 retval = acpi_bus_get_device(handle, &device);
744 dbg("acpi_device not found\n");
748 retval = acpi_bus_trim(device, 1);
750 err("cannot remove from acpi list\n");
755 static void acpiphp_set_acpi_region(struct acpiphp_slot *slot)
757 struct acpiphp_func *func;
758 union acpi_object params[2];
759 struct acpi_object_list arg_list;
761 list_for_each_entry(func, &slot->funcs, sibling) {
763 arg_list.pointer = params;
764 params[0].type = ACPI_TYPE_INTEGER;
765 params[0].integer.value = ACPI_ADR_SPACE_PCI_CONFIG;
766 params[1].type = ACPI_TYPE_INTEGER;
767 params[1].integer.value = 1;
768 /* _REG is optional, we don't care about if there is failure */
769 acpi_evaluate_object(func->handle, "_REG", &arg_list, NULL);
774 * enable_device - enable, configure a slot
775 * @slot: slot to be enabled
777 * This function should be called per *physical slot*,
778 * not per each slot object in ACPI namespace.
780 static int __ref enable_device(struct acpiphp_slot *slot)
783 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_entry(func, &slot->funcs, sibling)
824 acpiphp_bus_add(func);
826 pci_bus_assign_resources(bus);
827 acpiphp_sanitize_bus(bus);
828 acpiphp_set_hpp_values(bus);
829 acpiphp_set_acpi_region(slot);
830 pci_enable_bridges(bus);
832 list_for_each_entry(dev, &bus->devices, bus_list) {
833 /* Assume that newly added devices are powered on already. */
835 dev->current_state = PCI_D0;
838 pci_bus_add_devices(bus);
840 list_for_each_entry(func, &slot->funcs, sibling) {
841 dev = pci_get_slot(bus, PCI_DEVFN(slot->device,
846 if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE &&
847 dev->hdr_type != PCI_HEADER_TYPE_CARDBUS) {
852 status = find_p2p_bridge(func->handle, (u32)1, bus, NULL);
853 if (ACPI_FAILURE(status))
854 warn("find_p2p_bridge failed (error code = 0x%x)\n",
859 slot->flags |= SLOT_ENABLED;
865 static void disable_bridges(struct pci_bus *bus)
868 list_for_each_entry(dev, &bus->devices, bus_list) {
869 if (dev->subordinate) {
870 disable_bridges(dev->subordinate);
871 pci_disable_device(dev);
877 * disable_device - disable a slot
878 * @slot: ACPI PHP slot
880 static int disable_device(struct acpiphp_slot *slot)
882 struct acpiphp_func *func;
883 struct pci_dev *pdev;
885 /* is this slot already disabled? */
886 if (!(slot->flags & SLOT_ENABLED))
889 list_for_each_entry(func, &slot->funcs, sibling) {
891 /* cleanup p2p bridges under this P2P bridge */
892 cleanup_p2p_bridge(func->bridge->handle,
897 pdev = pci_get_slot(slot->bridge->pci_bus,
898 PCI_DEVFN(slot->device, func->function));
900 pci_stop_bus_device(pdev);
901 if (pdev->subordinate) {
902 disable_bridges(pdev->subordinate);
903 pci_disable_device(pdev);
905 pci_remove_bus_device(pdev);
910 list_for_each_entry(func, &slot->funcs, sibling) {
911 acpiphp_bus_trim(func->handle);
914 slot->flags &= (~SLOT_ENABLED);
922 * get_slot_status - get ACPI slot status
923 * @slot: ACPI PHP slot
925 * If a slot has _STA for each function and if any one of them
926 * returned non-zero status, return it.
928 * If a slot doesn't have _STA and if any one of its functions'
929 * configuration space is configured, return 0x0f as a _STA.
931 * Otherwise return 0.
933 static unsigned int get_slot_status(struct acpiphp_slot *slot)
936 unsigned long long sta = 0;
938 struct acpiphp_func *func;
940 list_for_each_entry(func, &slot->funcs, sibling) {
941 if (func->flags & FUNC_HAS_STA) {
942 status = acpi_evaluate_integer(func->handle, "_STA", NULL, &sta);
943 if (ACPI_SUCCESS(status) && sta)
946 pci_bus_read_config_dword(slot->bridge->pci_bus,
947 PCI_DEVFN(slot->device,
949 PCI_VENDOR_ID, &dvid);
950 if (dvid != 0xffffffff) {
957 return (unsigned int)sta;
961 * acpiphp_eject_slot - physically eject the slot
962 * @slot: ACPI PHP slot
964 int acpiphp_eject_slot(struct acpiphp_slot *slot)
967 struct acpiphp_func *func;
968 struct acpi_object_list arg_list;
969 union acpi_object arg;
971 list_for_each_entry(func, &slot->funcs, sibling) {
972 /* We don't want to call _EJ0 on non-existing functions. */
973 if ((func->flags & FUNC_HAS_EJ0)) {
974 /* _EJ0 method take one argument */
976 arg_list.pointer = &arg;
977 arg.type = ACPI_TYPE_INTEGER;
978 arg.integer.value = 1;
980 status = acpi_evaluate_object(func->handle, "_EJ0", &arg_list, NULL);
981 if (ACPI_FAILURE(status)) {
982 warn("%s: _EJ0 failed\n", __func__);
992 * acpiphp_check_bridge - re-enumerate devices
993 * @bridge: where to begin re-enumeration
995 * Iterate over all slots under this bridge and make sure that if a
996 * card is present they are enabled, and if not they are disabled.
998 static int acpiphp_check_bridge(struct acpiphp_bridge *bridge)
1000 struct acpiphp_slot *slot;
1002 int enabled, disabled;
1004 enabled = disabled = 0;
1006 for (slot = bridge->slots; slot; slot = slot->next) {
1007 unsigned int status = get_slot_status(slot);
1008 if (slot->flags & SLOT_ENABLED) {
1009 if (status == ACPI_STA_ALL)
1011 retval = acpiphp_disable_slot(slot);
1013 err("Error occurred in disabling\n");
1016 acpiphp_eject_slot(slot);
1020 if (status != ACPI_STA_ALL)
1022 retval = acpiphp_enable_slot(slot);
1024 err("Error occurred in enabling\n");
1031 dbg("%s: %d enabled, %d disabled\n", __func__, enabled, disabled);
1037 static void acpiphp_set_hpp_values(struct pci_bus *bus)
1039 struct pci_dev *dev;
1041 list_for_each_entry(dev, &bus->devices, bus_list)
1042 pci_configure_slot(dev);
1046 * Remove devices for which we could not assign resources, call
1047 * arch specific code to fix-up the bus
1049 static void acpiphp_sanitize_bus(struct pci_bus *bus)
1051 struct pci_dev *dev;
1053 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM;
1055 list_for_each_entry(dev, &bus->devices, bus_list) {
1056 for (i=0; i<PCI_BRIDGE_RESOURCES; i++) {
1057 struct resource *res = &dev->resource[i];
1058 if ((res->flags & type_mask) && !res->start &&
1060 /* Could not assign a required resources
1061 * for this device, remove it */
1062 pci_remove_bus_device(dev);
1069 /* Program resources in newly inserted bridge */
1070 static int acpiphp_configure_bridge (acpi_handle handle)
1072 struct pci_bus *bus;
1074 if (acpi_is_root_bridge(handle)) {
1075 struct acpi_pci_root *root = acpi_pci_find_root(handle);
1078 struct pci_dev *pdev = acpi_get_pci_dev(handle);
1079 bus = pdev->subordinate;
1083 pci_bus_size_bridges(bus);
1084 pci_bus_assign_resources(bus);
1085 acpiphp_sanitize_bus(bus);
1086 acpiphp_set_hpp_values(bus);
1087 pci_enable_bridges(bus);
1091 static void handle_bridge_insertion(acpi_handle handle, u32 type)
1093 struct acpi_device *device, *pdevice;
1094 acpi_handle phandle;
1096 if ((type != ACPI_NOTIFY_BUS_CHECK) &&
1097 (type != ACPI_NOTIFY_DEVICE_CHECK)) {
1098 err("unexpected notification type %d\n", type);
1102 acpi_get_parent(handle, &phandle);
1103 if (acpi_bus_get_device(phandle, &pdevice)) {
1104 dbg("no parent device, assuming NULL\n");
1107 if (acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE)) {
1108 err("cannot add bridge to acpi list\n");
1111 if (!acpiphp_configure_bridge(handle) &&
1112 !acpi_bus_start(device))
1115 err("cannot configure and start bridge\n");
1120 * ACPI event handlers
1124 count_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1126 int *count = (int *)context;
1127 struct acpiphp_bridge *bridge;
1129 bridge = acpiphp_handle_to_bridge(handle);
1136 check_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1138 struct acpiphp_bridge *bridge;
1140 struct acpi_buffer buffer = { .length = sizeof(objname),
1141 .pointer = objname };
1143 bridge = acpiphp_handle_to_bridge(handle);
1145 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1146 dbg("%s: re-enumerating slots under %s\n",
1148 acpiphp_check_bridge(bridge);
1153 struct acpiphp_hp_work {
1154 struct work_struct work;
1160 static void alloc_acpiphp_hp_work(acpi_handle handle, u32 type,
1162 void (*func)(struct work_struct *work))
1164 struct acpiphp_hp_work *hp_work;
1167 hp_work = kmalloc(sizeof(*hp_work), GFP_KERNEL);
1171 hp_work->handle = handle;
1172 hp_work->type = type;
1173 hp_work->context = context;
1175 INIT_WORK(&hp_work->work, func);
1176 ret = queue_work(kacpi_hotplug_wq, &hp_work->work);
1181 static void _handle_hotplug_event_bridge(struct work_struct *work)
1183 struct acpiphp_bridge *bridge;
1185 struct acpi_buffer buffer = { .length = sizeof(objname),
1186 .pointer = objname };
1187 struct acpi_device *device;
1188 int num_sub_bridges = 0;
1189 struct acpiphp_hp_work *hp_work;
1193 hp_work = container_of(work, struct acpiphp_hp_work, work);
1194 handle = hp_work->handle;
1195 type = hp_work->type;
1197 if (acpi_bus_get_device(handle, &device)) {
1198 /* This bridge must have just been physically inserted */
1199 handle_bridge_insertion(handle, type);
1203 bridge = acpiphp_handle_to_bridge(handle);
1204 if (type == ACPI_NOTIFY_BUS_CHECK) {
1205 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, ACPI_UINT32_MAX,
1206 count_sub_bridges, NULL, &num_sub_bridges, NULL);
1209 if (!bridge && !num_sub_bridges) {
1210 err("cannot get bridge info\n");
1214 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1217 case ACPI_NOTIFY_BUS_CHECK:
1218 /* bus re-enumerate */
1219 dbg("%s: Bus check notify on %s\n", __func__, objname);
1221 dbg("%s: re-enumerating slots under %s\n",
1223 acpiphp_check_bridge(bridge);
1225 if (num_sub_bridges)
1226 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
1227 ACPI_UINT32_MAX, check_sub_bridges, NULL, NULL, NULL);
1230 case ACPI_NOTIFY_DEVICE_CHECK:
1232 dbg("%s: Device check notify on %s\n", __func__, objname);
1233 acpiphp_check_bridge(bridge);
1236 case ACPI_NOTIFY_DEVICE_WAKE:
1238 dbg("%s: Device wake notify on %s\n", __func__, objname);
1241 case ACPI_NOTIFY_EJECT_REQUEST:
1242 /* request device eject */
1243 dbg("%s: Device eject notify on %s\n", __func__, objname);
1244 if ((bridge->type != BRIDGE_TYPE_HOST) &&
1245 (bridge->flags & BRIDGE_HAS_EJ0)) {
1246 struct acpiphp_slot *slot;
1247 slot = bridge->func->slot;
1248 if (!acpiphp_disable_slot(slot))
1249 acpiphp_eject_slot(slot);
1253 case ACPI_NOTIFY_FREQUENCY_MISMATCH:
1254 printk(KERN_ERR "Device %s cannot be configured due"
1255 " to a frequency mismatch\n", objname);
1258 case ACPI_NOTIFY_BUS_MODE_MISMATCH:
1259 printk(KERN_ERR "Device %s cannot be configured due"
1260 " to a bus mode mismatch\n", objname);
1263 case ACPI_NOTIFY_POWER_FAULT:
1264 printk(KERN_ERR "Device %s has suffered a power fault\n",
1269 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
1274 kfree(hp_work); /* allocated in handle_hotplug_event_bridge */
1278 * handle_hotplug_event_bridge - handle ACPI event on bridges
1279 * @handle: Notify()'ed acpi_handle
1280 * @type: Notify code
1281 * @context: pointer to acpiphp_bridge structure
1283 * Handles ACPI event notification on {host,p2p} bridges.
1285 static void handle_hotplug_event_bridge(acpi_handle handle, u32 type,
1289 * Currently the code adds all hotplug events to the kacpid_wq
1290 * queue when it should add hotplug events to the kacpi_hotplug_wq.
1291 * The proper way to fix this is to reorganize the code so that
1292 * drivers (dock, etc.) do not call acpi_os_execute(), etc.
1293 * For now just re-add this work to the kacpi_hotplug_wq so we
1294 * don't deadlock on hotplug actions.
1296 alloc_acpiphp_hp_work(handle, type, context,
1297 _handle_hotplug_event_bridge);
1300 static void _handle_hotplug_event_func(struct work_struct *work)
1302 struct acpiphp_func *func;
1304 struct acpi_buffer buffer = { .length = sizeof(objname),
1305 .pointer = objname };
1306 struct acpiphp_hp_work *hp_work;
1311 hp_work = container_of(work, struct acpiphp_hp_work, work);
1312 handle = hp_work->handle;
1313 type = hp_work->type;
1314 context = hp_work->context;
1316 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1318 func = (struct acpiphp_func *)context;
1321 case ACPI_NOTIFY_BUS_CHECK:
1322 /* bus re-enumerate */
1323 dbg("%s: Bus check notify on %s\n", __func__, objname);
1324 acpiphp_enable_slot(func->slot);
1327 case ACPI_NOTIFY_DEVICE_CHECK:
1328 /* device check : re-enumerate from parent bus */
1329 dbg("%s: Device check notify on %s\n", __func__, objname);
1330 acpiphp_check_bridge(func->slot->bridge);
1333 case ACPI_NOTIFY_DEVICE_WAKE:
1335 dbg("%s: Device wake notify on %s\n", __func__, objname);
1338 case ACPI_NOTIFY_EJECT_REQUEST:
1339 /* request device eject */
1340 dbg("%s: Device eject notify on %s\n", __func__, objname);
1341 if (!(acpiphp_disable_slot(func->slot)))
1342 acpiphp_eject_slot(func->slot);
1346 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
1350 kfree(hp_work); /* allocated in handle_hotplug_event_func */
1354 * handle_hotplug_event_func - handle ACPI event on functions (i.e. slots)
1355 * @handle: Notify()'ed acpi_handle
1356 * @type: Notify code
1357 * @context: pointer to acpiphp_func structure
1359 * Handles ACPI event notification on slots.
1361 static void handle_hotplug_event_func(acpi_handle handle, u32 type,
1365 * Currently the code adds all hotplug events to the kacpid_wq
1366 * queue when it should add hotplug events to the kacpi_hotplug_wq.
1367 * The proper way to fix this is to reorganize the code so that
1368 * drivers (dock, etc.) do not call acpi_os_execute(), etc.
1369 * For now just re-add this work to the kacpi_hotplug_wq so we
1370 * don't deadlock on hotplug actions.
1372 alloc_acpiphp_hp_work(handle, type, context,
1373 _handle_hotplug_event_func);
1377 find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1379 int *count = (int *)context;
1381 if (acpi_is_root_bridge(handle)) {
1382 acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
1383 handle_hotplug_event_bridge, NULL);
1389 static struct acpi_pci_driver acpi_pci_hp_driver = {
1391 .remove = remove_bridge,
1395 * acpiphp_glue_init - initializes all PCI hotplug - ACPI glue data structures
1397 int __init acpiphp_glue_init(void)
1401 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
1402 ACPI_UINT32_MAX, find_root_bridges, NULL, &num, NULL);
1407 acpi_pci_register_driver(&acpi_pci_hp_driver);
1414 * acpiphp_glue_exit - terminates all PCI hotplug - ACPI glue data structures
1416 * This function frees all data allocated in acpiphp_glue_init().
1418 void acpiphp_glue_exit(void)
1420 acpi_pci_unregister_driver(&acpi_pci_hp_driver);
1425 * acpiphp_get_num_slots - count number of slots in a system
1427 int __init acpiphp_get_num_slots(void)
1429 struct acpiphp_bridge *bridge;
1432 list_for_each_entry(bridge, &bridge_list, list) {
1433 dbg("Bus %04x:%02x has %d slot%s\n",
1434 pci_domain_nr(bridge->pci_bus),
1435 bridge->pci_bus->number, bridge->nr_slots,
1436 bridge->nr_slots == 1 ? "" : "s");
1437 num_slots += bridge->nr_slots;
1440 dbg("Total %d slots\n", num_slots);
1447 * acpiphp_for_each_slot - call function for each slot
1448 * @fn: callback function
1449 * @data: context to be passed to callback function
1451 static int acpiphp_for_each_slot(acpiphp_callback fn, void *data)
1453 struct list_head *node;
1454 struct acpiphp_bridge *bridge;
1455 struct acpiphp_slot *slot;
1458 list_for_each (node, &bridge_list) {
1459 bridge = (struct acpiphp_bridge *)node;
1460 for (slot = bridge->slots; slot; slot = slot->next) {
1461 retval = fn(slot, data);
1474 * acpiphp_enable_slot - power on slot
1475 * @slot: ACPI PHP slot
1477 int acpiphp_enable_slot(struct acpiphp_slot *slot)
1481 mutex_lock(&slot->crit_sect);
1483 /* wake up all functions */
1484 retval = power_on_slot(slot);
1488 if (get_slot_status(slot) == ACPI_STA_ALL) {
1489 /* configure all functions */
1490 retval = enable_device(slot);
1492 power_off_slot(slot);
1494 dbg("%s: Slot status is not ACPI_STA_ALL\n", __func__);
1495 power_off_slot(slot);
1499 mutex_unlock(&slot->crit_sect);
1504 * acpiphp_disable_slot - power off slot
1505 * @slot: ACPI PHP slot
1507 int acpiphp_disable_slot(struct acpiphp_slot *slot)
1511 mutex_lock(&slot->crit_sect);
1513 /* unconfigure all functions */
1514 retval = disable_device(slot);
1518 /* power off all functions */
1519 retval = power_off_slot(slot);
1524 mutex_unlock(&slot->crit_sect);
1533 u8 acpiphp_get_power_status(struct acpiphp_slot *slot)
1535 return (slot->flags & SLOT_POWEREDON);
1543 u8 acpiphp_get_latch_status(struct acpiphp_slot *slot)
1547 sta = get_slot_status(slot);
1549 return (sta & ACPI_STA_SHOW_IN_UI) ? 0 : 1;
1554 * adapter presence : 1
1557 u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot)
1561 sta = get_slot_status(slot);
1563 return (sta == 0) ? 0 : 1;