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 struct acpi_pci_root *root;
463 acpi_handle dummy_handle;
466 * We shouldn't use this bridge if PCIe native hotplug control has been
467 * granted by the BIOS for it.
469 root = acpi_pci_find_root(handle);
470 if (root && (root->osc_control_set & OSC_PCI_EXPRESS_NATIVE_HP_CONTROL))
473 /* if the bridge doesn't have _STA, we assume it is always there */
474 status = acpi_get_handle(handle, "_STA", &dummy_handle);
475 if (ACPI_SUCCESS(status)) {
476 status = acpi_evaluate_integer(handle, "_STA", NULL, &tmp);
477 if (ACPI_FAILURE(status)) {
478 dbg("%s: _STA evaluation failure\n", __func__);
481 if ((tmp & ACPI_STA_FUNCTIONING) == 0)
482 /* don't register this object */
486 /* check if this bridge has ejectable slots */
487 if (detect_ejectable_slots(handle) > 0) {
488 dbg("found PCI host-bus bridge with hot-pluggable slots\n");
489 add_host_bridge(handle);
492 /* search P2P bridges under this host bridge */
493 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
494 find_p2p_bridge, NULL, NULL, NULL);
496 if (ACPI_FAILURE(status))
497 warn("find_p2p_bridge failed (error code = 0x%x)\n", status);
502 static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle)
504 struct acpiphp_bridge *bridge;
506 list_for_each_entry(bridge, &bridge_list, list)
507 if (bridge->handle == handle)
513 static void cleanup_bridge(struct acpiphp_bridge *bridge)
515 struct acpiphp_slot *slot, *next;
516 struct acpiphp_func *func, *tmp;
518 acpi_handle handle = bridge->handle;
520 status = acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
521 handle_hotplug_event_bridge);
522 if (ACPI_FAILURE(status))
523 err("failed to remove notify handler\n");
525 if ((bridge->type != BRIDGE_TYPE_HOST) &&
526 ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func)) {
527 status = acpi_install_notify_handler(bridge->func->handle,
529 handle_hotplug_event_func,
531 if (ACPI_FAILURE(status))
532 err("failed to install interrupt notify handler\n");
535 slot = bridge->slots;
538 list_for_each_entry_safe(func, tmp, &slot->funcs, sibling) {
539 if (is_dock_device(func->handle)) {
540 unregister_hotplug_dock_device(func->handle);
541 unregister_dock_notifier(&func->nb);
543 if (!(func->flags & FUNC_HAS_DCK)) {
544 status = acpi_remove_notify_handler(func->handle,
546 handle_hotplug_event_func);
547 if (ACPI_FAILURE(status))
548 err("failed to remove notify handler\n");
550 list_del(&func->sibling);
553 acpiphp_unregister_hotplug_slot(slot);
554 list_del(&slot->funcs);
560 * Only P2P bridges have a pci_dev
563 put_device(&bridge->pci_bus->dev);
565 pci_dev_put(bridge->pci_dev);
566 list_del(&bridge->list);
571 cleanup_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
573 struct acpiphp_bridge *bridge;
575 /* cleanup p2p bridges under this P2P bridge
576 in a depth-first manner */
577 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
578 cleanup_p2p_bridge, NULL, NULL, NULL);
580 bridge = acpiphp_handle_to_bridge(handle);
582 cleanup_bridge(bridge);
587 static void remove_bridge(acpi_handle handle)
589 struct acpiphp_bridge *bridge;
591 /* cleanup p2p bridges under this host bridge
592 in a depth-first manner */
593 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
594 (u32)1, cleanup_p2p_bridge, NULL, NULL, NULL);
597 * On root bridges with hotplug slots directly underneath (ie,
598 * no p2p bridge between), we call cleanup_bridge().
600 * The else clause cleans up root bridges that either had no
601 * hotplug slots at all, or had a p2p bridge underneath.
603 bridge = acpiphp_handle_to_bridge(handle);
605 cleanup_bridge(bridge);
607 acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
608 handle_hotplug_event_bridge);
611 static int power_on_slot(struct acpiphp_slot *slot)
614 struct acpiphp_func *func;
617 /* if already enabled, just skip */
618 if (slot->flags & SLOT_POWEREDON)
621 list_for_each_entry(func, &slot->funcs, sibling) {
622 if (func->flags & FUNC_HAS_PS0) {
623 dbg("%s: executing _PS0\n", __func__);
624 status = acpi_evaluate_object(func->handle, "_PS0", NULL, NULL);
625 if (ACPI_FAILURE(status)) {
626 warn("%s: _PS0 failed\n", __func__);
634 /* TBD: evaluate _STA to check if the slot is enabled */
636 slot->flags |= SLOT_POWEREDON;
643 static int power_off_slot(struct acpiphp_slot *slot)
646 struct acpiphp_func *func;
650 /* if already disabled, just skip */
651 if ((slot->flags & SLOT_POWEREDON) == 0)
654 list_for_each_entry(func, &slot->funcs, sibling) {
655 if (func->flags & FUNC_HAS_PS3) {
656 status = acpi_evaluate_object(func->handle, "_PS3", NULL, NULL);
657 if (ACPI_FAILURE(status)) {
658 warn("%s: _PS3 failed\n", __func__);
666 /* TBD: evaluate _STA to check if the slot is disabled */
668 slot->flags &= (~SLOT_POWEREDON);
677 * acpiphp_max_busnr - return the highest reserved bus number under the given bus.
678 * @bus: bus to start search with
680 static unsigned char acpiphp_max_busnr(struct pci_bus *bus)
682 struct list_head *tmp;
683 unsigned char max, n;
686 * pci_bus_max_busnr will return the highest
687 * reserved busnr for all these children.
688 * that is equivalent to the bus->subordinate
689 * value. We don't want to use the parent's
690 * bus->subordinate value because it could have
693 max = bus->secondary;
695 list_for_each(tmp, &bus->children) {
696 n = pci_bus_max_busnr(pci_bus_b(tmp));
705 * acpiphp_bus_add - add a new bus to acpi subsystem
706 * @func: acpiphp_func of the bridge
708 static int acpiphp_bus_add(struct acpiphp_func *func)
711 struct acpi_device *device, *pdevice;
714 acpi_get_parent(func->handle, &phandle);
715 if (acpi_bus_get_device(phandle, &pdevice)) {
716 dbg("no parent device, assuming NULL\n");
719 if (!acpi_bus_get_device(func->handle, &device)) {
720 dbg("bus exists... trim\n");
721 /* this shouldn't be in here, so remove
722 * the bus then re-add it...
724 ret_val = acpi_bus_trim(device, 1);
725 dbg("acpi_bus_trim return %x\n", ret_val);
728 ret_val = acpi_bus_add(&device, pdevice, func->handle,
729 ACPI_BUS_TYPE_DEVICE);
731 dbg("error adding bus, %x\n",
733 goto acpiphp_bus_add_out;
735 ret_val = acpi_bus_start(device);
743 * acpiphp_bus_trim - trim a bus from acpi subsystem
744 * @handle: handle to acpi namespace
746 static int acpiphp_bus_trim(acpi_handle handle)
748 struct acpi_device *device;
751 retval = acpi_bus_get_device(handle, &device);
753 dbg("acpi_device not found\n");
757 retval = acpi_bus_trim(device, 1);
759 err("cannot remove from acpi list\n");
764 static void acpiphp_set_acpi_region(struct acpiphp_slot *slot)
766 struct acpiphp_func *func;
767 union acpi_object params[2];
768 struct acpi_object_list arg_list;
770 list_for_each_entry(func, &slot->funcs, sibling) {
772 arg_list.pointer = params;
773 params[0].type = ACPI_TYPE_INTEGER;
774 params[0].integer.value = ACPI_ADR_SPACE_PCI_CONFIG;
775 params[1].type = ACPI_TYPE_INTEGER;
776 params[1].integer.value = 1;
777 /* _REG is optional, we don't care about if there is failure */
778 acpi_evaluate_object(func->handle, "_REG", &arg_list, NULL);
783 * enable_device - enable, configure a slot
784 * @slot: slot to be enabled
786 * This function should be called per *physical slot*,
787 * not per each slot object in ACPI namespace.
789 static int __ref enable_device(struct acpiphp_slot *slot)
792 struct pci_bus *bus = slot->bridge->pci_bus;
793 struct acpiphp_func *func;
798 if (slot->flags & SLOT_ENABLED)
801 /* sanity check: dev should be NULL when hot-plugged in */
802 dev = pci_get_slot(bus, PCI_DEVFN(slot->device, 0));
804 /* This case shouldn't happen */
805 err("pci_dev structure already exists.\n");
811 num = pci_scan_slot(bus, PCI_DEVFN(slot->device, 0));
813 err("No new device found\n");
818 max = acpiphp_max_busnr(bus);
819 for (pass = 0; pass < 2; pass++) {
820 list_for_each_entry(dev, &bus->devices, bus_list) {
821 if (PCI_SLOT(dev->devfn) != slot->device)
823 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
824 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
825 max = pci_scan_bridge(bus, dev, max, pass);
826 if (pass && dev->subordinate)
827 pci_bus_size_bridges(dev->subordinate);
832 list_for_each_entry(func, &slot->funcs, sibling)
833 acpiphp_bus_add(func);
835 pci_bus_assign_resources(bus);
836 acpiphp_sanitize_bus(bus);
837 acpiphp_set_hpp_values(bus);
838 acpiphp_set_acpi_region(slot);
839 pci_enable_bridges(bus);
841 list_for_each_entry(dev, &bus->devices, bus_list) {
842 /* Assume that newly added devices are powered on already. */
844 dev->current_state = PCI_D0;
847 pci_bus_add_devices(bus);
849 list_for_each_entry(func, &slot->funcs, sibling) {
850 dev = pci_get_slot(bus, PCI_DEVFN(slot->device,
855 if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE &&
856 dev->hdr_type != PCI_HEADER_TYPE_CARDBUS) {
861 status = find_p2p_bridge(func->handle, (u32)1, bus, NULL);
862 if (ACPI_FAILURE(status))
863 warn("find_p2p_bridge failed (error code = 0x%x)\n",
868 slot->flags |= SLOT_ENABLED;
874 static void disable_bridges(struct pci_bus *bus)
877 list_for_each_entry(dev, &bus->devices, bus_list) {
878 if (dev->subordinate) {
879 disable_bridges(dev->subordinate);
880 pci_disable_device(dev);
886 * disable_device - disable a slot
887 * @slot: ACPI PHP slot
889 static int disable_device(struct acpiphp_slot *slot)
891 struct acpiphp_func *func;
892 struct pci_dev *pdev;
894 /* is this slot already disabled? */
895 if (!(slot->flags & SLOT_ENABLED))
898 list_for_each_entry(func, &slot->funcs, sibling) {
900 /* cleanup p2p bridges under this P2P bridge */
901 cleanup_p2p_bridge(func->bridge->handle,
906 pdev = pci_get_slot(slot->bridge->pci_bus,
907 PCI_DEVFN(slot->device, func->function));
909 pci_stop_bus_device(pdev);
910 if (pdev->subordinate) {
911 disable_bridges(pdev->subordinate);
912 pci_disable_device(pdev);
914 pci_remove_bus_device(pdev);
919 list_for_each_entry(func, &slot->funcs, sibling) {
920 acpiphp_bus_trim(func->handle);
923 slot->flags &= (~SLOT_ENABLED);
931 * get_slot_status - get ACPI slot status
932 * @slot: ACPI PHP slot
934 * If a slot has _STA for each function and if any one of them
935 * returned non-zero status, return it.
937 * If a slot doesn't have _STA and if any one of its functions'
938 * configuration space is configured, return 0x0f as a _STA.
940 * Otherwise return 0.
942 static unsigned int get_slot_status(struct acpiphp_slot *slot)
945 unsigned long long sta = 0;
947 struct acpiphp_func *func;
949 list_for_each_entry(func, &slot->funcs, sibling) {
950 if (func->flags & FUNC_HAS_STA) {
951 status = acpi_evaluate_integer(func->handle, "_STA", NULL, &sta);
952 if (ACPI_SUCCESS(status) && sta)
955 pci_bus_read_config_dword(slot->bridge->pci_bus,
956 PCI_DEVFN(slot->device,
958 PCI_VENDOR_ID, &dvid);
959 if (dvid != 0xffffffff) {
966 return (unsigned int)sta;
970 * acpiphp_eject_slot - physically eject the slot
971 * @slot: ACPI PHP slot
973 int acpiphp_eject_slot(struct acpiphp_slot *slot)
976 struct acpiphp_func *func;
977 struct acpi_object_list arg_list;
978 union acpi_object arg;
980 list_for_each_entry(func, &slot->funcs, sibling) {
981 /* We don't want to call _EJ0 on non-existing functions. */
982 if ((func->flags & FUNC_HAS_EJ0)) {
983 /* _EJ0 method take one argument */
985 arg_list.pointer = &arg;
986 arg.type = ACPI_TYPE_INTEGER;
987 arg.integer.value = 1;
989 status = acpi_evaluate_object(func->handle, "_EJ0", &arg_list, NULL);
990 if (ACPI_FAILURE(status)) {
991 warn("%s: _EJ0 failed\n", __func__);
1001 * acpiphp_check_bridge - re-enumerate devices
1002 * @bridge: where to begin re-enumeration
1004 * Iterate over all slots under this bridge and make sure that if a
1005 * card is present they are enabled, and if not they are disabled.
1007 static int acpiphp_check_bridge(struct acpiphp_bridge *bridge)
1009 struct acpiphp_slot *slot;
1011 int enabled, disabled;
1013 enabled = disabled = 0;
1015 for (slot = bridge->slots; slot; slot = slot->next) {
1016 unsigned int status = get_slot_status(slot);
1017 if (slot->flags & SLOT_ENABLED) {
1018 if (status == ACPI_STA_ALL)
1020 retval = acpiphp_disable_slot(slot);
1022 err("Error occurred in disabling\n");
1025 acpiphp_eject_slot(slot);
1029 if (status != ACPI_STA_ALL)
1031 retval = acpiphp_enable_slot(slot);
1033 err("Error occurred in enabling\n");
1040 dbg("%s: %d enabled, %d disabled\n", __func__, enabled, disabled);
1046 static void acpiphp_set_hpp_values(struct pci_bus *bus)
1048 struct pci_dev *dev;
1050 list_for_each_entry(dev, &bus->devices, bus_list)
1051 pci_configure_slot(dev);
1055 * Remove devices for which we could not assign resources, call
1056 * arch specific code to fix-up the bus
1058 static void acpiphp_sanitize_bus(struct pci_bus *bus)
1060 struct pci_dev *dev;
1062 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM;
1064 list_for_each_entry(dev, &bus->devices, bus_list) {
1065 for (i=0; i<PCI_BRIDGE_RESOURCES; i++) {
1066 struct resource *res = &dev->resource[i];
1067 if ((res->flags & type_mask) && !res->start &&
1069 /* Could not assign a required resources
1070 * for this device, remove it */
1071 pci_remove_bus_device(dev);
1078 /* Program resources in newly inserted bridge */
1079 static int acpiphp_configure_bridge (acpi_handle handle)
1081 struct pci_bus *bus;
1083 if (acpi_is_root_bridge(handle)) {
1084 struct acpi_pci_root *root = acpi_pci_find_root(handle);
1087 struct pci_dev *pdev = acpi_get_pci_dev(handle);
1088 bus = pdev->subordinate;
1092 pci_bus_size_bridges(bus);
1093 pci_bus_assign_resources(bus);
1094 acpiphp_sanitize_bus(bus);
1095 acpiphp_set_hpp_values(bus);
1096 pci_enable_bridges(bus);
1100 static void handle_bridge_insertion(acpi_handle handle, u32 type)
1102 struct acpi_device *device, *pdevice;
1103 acpi_handle phandle;
1105 if ((type != ACPI_NOTIFY_BUS_CHECK) &&
1106 (type != ACPI_NOTIFY_DEVICE_CHECK)) {
1107 err("unexpected notification type %d\n", type);
1111 acpi_get_parent(handle, &phandle);
1112 if (acpi_bus_get_device(phandle, &pdevice)) {
1113 dbg("no parent device, assuming NULL\n");
1116 if (acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE)) {
1117 err("cannot add bridge to acpi list\n");
1120 if (!acpiphp_configure_bridge(handle) &&
1121 !acpi_bus_start(device))
1124 err("cannot configure and start bridge\n");
1129 * ACPI event handlers
1133 count_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1135 int *count = (int *)context;
1136 struct acpiphp_bridge *bridge;
1138 bridge = acpiphp_handle_to_bridge(handle);
1145 check_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1147 struct acpiphp_bridge *bridge;
1149 struct acpi_buffer buffer = { .length = sizeof(objname),
1150 .pointer = objname };
1152 bridge = acpiphp_handle_to_bridge(handle);
1154 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1155 dbg("%s: re-enumerating slots under %s\n",
1157 acpiphp_check_bridge(bridge);
1162 struct acpiphp_hp_work {
1163 struct work_struct work;
1169 static void alloc_acpiphp_hp_work(acpi_handle handle, u32 type,
1171 void (*func)(struct work_struct *work))
1173 struct acpiphp_hp_work *hp_work;
1176 hp_work = kmalloc(sizeof(*hp_work), GFP_KERNEL);
1180 hp_work->handle = handle;
1181 hp_work->type = type;
1182 hp_work->context = context;
1184 INIT_WORK(&hp_work->work, func);
1185 ret = queue_work(kacpi_hotplug_wq, &hp_work->work);
1190 static void _handle_hotplug_event_bridge(struct work_struct *work)
1192 struct acpiphp_bridge *bridge;
1194 struct acpi_buffer buffer = { .length = sizeof(objname),
1195 .pointer = objname };
1196 struct acpi_device *device;
1197 int num_sub_bridges = 0;
1198 struct acpiphp_hp_work *hp_work;
1202 hp_work = container_of(work, struct acpiphp_hp_work, work);
1203 handle = hp_work->handle;
1204 type = hp_work->type;
1206 if (acpi_bus_get_device(handle, &device)) {
1207 /* This bridge must have just been physically inserted */
1208 handle_bridge_insertion(handle, type);
1212 bridge = acpiphp_handle_to_bridge(handle);
1213 if (type == ACPI_NOTIFY_BUS_CHECK) {
1214 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, ACPI_UINT32_MAX,
1215 count_sub_bridges, NULL, &num_sub_bridges, NULL);
1218 if (!bridge && !num_sub_bridges) {
1219 err("cannot get bridge info\n");
1223 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1226 case ACPI_NOTIFY_BUS_CHECK:
1227 /* bus re-enumerate */
1228 dbg("%s: Bus check notify on %s\n", __func__, objname);
1230 dbg("%s: re-enumerating slots under %s\n",
1232 acpiphp_check_bridge(bridge);
1234 if (num_sub_bridges)
1235 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
1236 ACPI_UINT32_MAX, check_sub_bridges, NULL, NULL, NULL);
1239 case ACPI_NOTIFY_DEVICE_CHECK:
1241 dbg("%s: Device check notify on %s\n", __func__, objname);
1242 acpiphp_check_bridge(bridge);
1245 case ACPI_NOTIFY_DEVICE_WAKE:
1247 dbg("%s: Device wake notify on %s\n", __func__, objname);
1250 case ACPI_NOTIFY_EJECT_REQUEST:
1251 /* request device eject */
1252 dbg("%s: Device eject notify on %s\n", __func__, objname);
1253 if ((bridge->type != BRIDGE_TYPE_HOST) &&
1254 (bridge->flags & BRIDGE_HAS_EJ0)) {
1255 struct acpiphp_slot *slot;
1256 slot = bridge->func->slot;
1257 if (!acpiphp_disable_slot(slot))
1258 acpiphp_eject_slot(slot);
1262 case ACPI_NOTIFY_FREQUENCY_MISMATCH:
1263 printk(KERN_ERR "Device %s cannot be configured due"
1264 " to a frequency mismatch\n", objname);
1267 case ACPI_NOTIFY_BUS_MODE_MISMATCH:
1268 printk(KERN_ERR "Device %s cannot be configured due"
1269 " to a bus mode mismatch\n", objname);
1272 case ACPI_NOTIFY_POWER_FAULT:
1273 printk(KERN_ERR "Device %s has suffered a power fault\n",
1278 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
1283 kfree(hp_work); /* allocated in handle_hotplug_event_bridge */
1287 * handle_hotplug_event_bridge - handle ACPI event on bridges
1288 * @handle: Notify()'ed acpi_handle
1289 * @type: Notify code
1290 * @context: pointer to acpiphp_bridge structure
1292 * Handles ACPI event notification on {host,p2p} bridges.
1294 static void handle_hotplug_event_bridge(acpi_handle handle, u32 type,
1298 * Currently the code adds all hotplug events to the kacpid_wq
1299 * queue when it should add hotplug events to the kacpi_hotplug_wq.
1300 * The proper way to fix this is to reorganize the code so that
1301 * drivers (dock, etc.) do not call acpi_os_execute(), etc.
1302 * For now just re-add this work to the kacpi_hotplug_wq so we
1303 * don't deadlock on hotplug actions.
1305 alloc_acpiphp_hp_work(handle, type, context,
1306 _handle_hotplug_event_bridge);
1309 static void _handle_hotplug_event_func(struct work_struct *work)
1311 struct acpiphp_func *func;
1313 struct acpi_buffer buffer = { .length = sizeof(objname),
1314 .pointer = objname };
1315 struct acpiphp_hp_work *hp_work;
1320 hp_work = container_of(work, struct acpiphp_hp_work, work);
1321 handle = hp_work->handle;
1322 type = hp_work->type;
1323 context = hp_work->context;
1325 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1327 func = (struct acpiphp_func *)context;
1330 case ACPI_NOTIFY_BUS_CHECK:
1331 /* bus re-enumerate */
1332 dbg("%s: Bus check notify on %s\n", __func__, objname);
1333 acpiphp_enable_slot(func->slot);
1336 case ACPI_NOTIFY_DEVICE_CHECK:
1337 /* device check : re-enumerate from parent bus */
1338 dbg("%s: Device check notify on %s\n", __func__, objname);
1339 acpiphp_check_bridge(func->slot->bridge);
1342 case ACPI_NOTIFY_DEVICE_WAKE:
1344 dbg("%s: Device wake notify on %s\n", __func__, objname);
1347 case ACPI_NOTIFY_EJECT_REQUEST:
1348 /* request device eject */
1349 dbg("%s: Device eject notify on %s\n", __func__, objname);
1350 if (!(acpiphp_disable_slot(func->slot)))
1351 acpiphp_eject_slot(func->slot);
1355 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
1359 kfree(hp_work); /* allocated in handle_hotplug_event_func */
1363 * handle_hotplug_event_func - handle ACPI event on functions (i.e. slots)
1364 * @handle: Notify()'ed acpi_handle
1365 * @type: Notify code
1366 * @context: pointer to acpiphp_func structure
1368 * Handles ACPI event notification on slots.
1370 static void handle_hotplug_event_func(acpi_handle handle, u32 type,
1374 * Currently the code adds all hotplug events to the kacpid_wq
1375 * queue when it should add hotplug events to the kacpi_hotplug_wq.
1376 * The proper way to fix this is to reorganize the code so that
1377 * drivers (dock, etc.) do not call acpi_os_execute(), etc.
1378 * For now just re-add this work to the kacpi_hotplug_wq so we
1379 * don't deadlock on hotplug actions.
1381 alloc_acpiphp_hp_work(handle, type, context,
1382 _handle_hotplug_event_func);
1386 find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1388 struct acpi_pci_root *root;
1389 int *count = (int *)context;
1391 if (!acpi_is_root_bridge(handle))
1394 root = acpi_pci_find_root(handle);
1398 if (root->osc_control_set & OSC_PCI_EXPRESS_NATIVE_HP_CONTROL)
1402 acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
1403 handle_hotplug_event_bridge, NULL);
1408 static struct acpi_pci_driver acpi_pci_hp_driver = {
1410 .remove = remove_bridge,
1414 * acpiphp_glue_init - initializes all PCI hotplug - ACPI glue data structures
1416 int __init acpiphp_glue_init(void)
1420 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
1421 ACPI_UINT32_MAX, find_root_bridges, NULL, &num, NULL);
1426 acpi_pci_register_driver(&acpi_pci_hp_driver);
1433 * acpiphp_glue_exit - terminates all PCI hotplug - ACPI glue data structures
1435 * This function frees all data allocated in acpiphp_glue_init().
1437 void acpiphp_glue_exit(void)
1439 acpi_pci_unregister_driver(&acpi_pci_hp_driver);
1444 * acpiphp_get_num_slots - count number of slots in a system
1446 int __init acpiphp_get_num_slots(void)
1448 struct acpiphp_bridge *bridge;
1451 list_for_each_entry(bridge, &bridge_list, list) {
1452 dbg("Bus %04x:%02x has %d slot%s\n",
1453 pci_domain_nr(bridge->pci_bus),
1454 bridge->pci_bus->number, bridge->nr_slots,
1455 bridge->nr_slots == 1 ? "" : "s");
1456 num_slots += bridge->nr_slots;
1459 dbg("Total %d slots\n", num_slots);
1466 * acpiphp_for_each_slot - call function for each slot
1467 * @fn: callback function
1468 * @data: context to be passed to callback function
1470 static int acpiphp_for_each_slot(acpiphp_callback fn, void *data)
1472 struct list_head *node;
1473 struct acpiphp_bridge *bridge;
1474 struct acpiphp_slot *slot;
1477 list_for_each (node, &bridge_list) {
1478 bridge = (struct acpiphp_bridge *)node;
1479 for (slot = bridge->slots; slot; slot = slot->next) {
1480 retval = fn(slot, data);
1493 * acpiphp_enable_slot - power on slot
1494 * @slot: ACPI PHP slot
1496 int acpiphp_enable_slot(struct acpiphp_slot *slot)
1500 mutex_lock(&slot->crit_sect);
1502 /* wake up all functions */
1503 retval = power_on_slot(slot);
1507 if (get_slot_status(slot) == ACPI_STA_ALL) {
1508 /* configure all functions */
1509 retval = enable_device(slot);
1511 power_off_slot(slot);
1513 dbg("%s: Slot status is not ACPI_STA_ALL\n", __func__);
1514 power_off_slot(slot);
1518 mutex_unlock(&slot->crit_sect);
1523 * acpiphp_disable_slot - power off slot
1524 * @slot: ACPI PHP slot
1526 int acpiphp_disable_slot(struct acpiphp_slot *slot)
1530 mutex_lock(&slot->crit_sect);
1532 /* unconfigure all functions */
1533 retval = disable_device(slot);
1537 /* power off all functions */
1538 retval = power_off_slot(slot);
1543 mutex_unlock(&slot->crit_sect);
1552 u8 acpiphp_get_power_status(struct acpiphp_slot *slot)
1554 return (slot->flags & SLOT_POWEREDON);
1562 u8 acpiphp_get_latch_status(struct acpiphp_slot *slot)
1566 sta = get_slot_status(slot);
1568 return (sta & ACPI_STA_SHOW_IN_UI) ? 0 : 1;
1573 * adapter presence : 1
1576 u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot)
1580 sta = get_slot_status(slot);
1582 return (sta == 0) ? 0 : 1;