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->busn_res.start) {
104 buses = (buses & 0xff000000)
105 | ((unsigned int)(bus->primary) << 0)
106 | ((unsigned int)(bus->busn_res.start) << 8)
107 | ((unsigned int)(bus->busn_res.end) << 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 status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr);
136 if (ACPI_FAILURE(status)) {
137 warn("can't evaluate _ADR (%#x)\n", status);
141 device = (adr >> 16) & 0xffff;
142 function = adr & 0xffff;
145 if (pdev && pci_is_pcie(pdev)) {
146 tmp = acpi_find_root_bridge_handle(pdev);
148 struct acpi_pci_root *root = acpi_pci_find_root(tmp);
150 if (root && (root->osc_control_set &
151 OSC_PCI_EXPRESS_NATIVE_HP_CONTROL))
156 newfunc = kzalloc(sizeof(struct acpiphp_func), GFP_KERNEL);
160 INIT_LIST_HEAD(&newfunc->sibling);
161 newfunc->handle = handle;
162 newfunc->function = function;
164 if (ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp)))
165 newfunc->flags = FUNC_HAS_EJ0;
167 if (ACPI_SUCCESS(acpi_get_handle(handle, "_STA", &tmp)))
168 newfunc->flags |= FUNC_HAS_STA;
170 if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS0", &tmp)))
171 newfunc->flags |= FUNC_HAS_PS0;
173 if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS3", &tmp)))
174 newfunc->flags |= FUNC_HAS_PS3;
176 if (ACPI_SUCCESS(acpi_get_handle(handle, "_DCK", &tmp)))
177 newfunc->flags |= FUNC_HAS_DCK;
179 status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun);
180 if (ACPI_FAILURE(status)) {
182 * use the count of the number of slots we've found
183 * for the number of the slot
185 sun = bridge->nr_slots+1;
188 /* search for objects that share the same slot */
189 for (slot = bridge->slots; slot; slot = slot->next)
190 if (slot->device == device) {
191 if (slot->sun != sun)
192 warn("sibling found, but _SUN doesn't match!\n");
197 slot = kzalloc(sizeof(struct acpiphp_slot), GFP_KERNEL);
203 slot->bridge = bridge;
204 slot->device = device;
206 INIT_LIST_HEAD(&slot->funcs);
207 mutex_init(&slot->crit_sect);
209 slot->next = bridge->slots;
210 bridge->slots = slot;
214 dbg("found ACPI PCI Hotplug slot %llu at PCI %04x:%02x:%02x\n",
215 slot->sun, pci_domain_nr(pbus), pbus->number, device);
216 retval = acpiphp_register_hotplug_slot(slot);
218 if (retval == -EBUSY)
219 warn("Slot %llu already registered by another "
220 "hotplug driver\n", slot->sun);
222 warn("acpiphp_register_hotplug_slot failed "
223 "(err code = 0x%x)\n", retval);
228 newfunc->slot = slot;
229 list_add_tail(&newfunc->sibling, &slot->funcs);
231 pdev = pci_get_slot(pbus, PCI_DEVFN(device, function));
233 slot->flags |= (SLOT_ENABLED | SLOT_POWEREDON);
237 if (is_dock_device(handle)) {
238 /* we don't want to call this device's _EJ0
239 * because we want the dock notify handler
240 * to call it after it calls _DCK
242 newfunc->flags &= ~FUNC_HAS_EJ0;
243 if (register_hotplug_dock_device(handle,
244 &acpiphp_dock_ops, newfunc))
245 dbg("failed to register dock device\n");
247 /* we need to be notified when dock events happen
248 * outside of the hotplug operation, since we may
249 * need to do fixups before we can hotplug.
251 newfunc->nb.notifier_call = post_dock_fixups;
252 if (register_dock_notifier(&newfunc->nb))
253 dbg("failed to register a dock notifier");
256 /* install notify handler */
257 if (!(newfunc->flags & FUNC_HAS_DCK)) {
258 status = acpi_install_notify_handler(handle,
260 handle_hotplug_event_func,
263 if (ACPI_FAILURE(status))
264 err("failed to register interrupt notify handler\n");
272 bridge->slots = slot->next;
280 /* see if it's worth looking at this bridge */
281 static int detect_ejectable_slots(acpi_handle handle)
283 int found = acpi_pci_detect_ejectable(handle);
285 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
286 is_pci_dock_device, NULL, (void *)&found, NULL);
291 /* initialize miscellaneous stuff for both root and PCI-to-PCI bridge */
292 static void init_bridge_misc(struct acpiphp_bridge *bridge)
296 /* must be added to the list prior to calling register_slot */
297 list_add(&bridge->list, &bridge_list);
299 /* register all slot objects under this bridge */
300 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge->handle, (u32)1,
301 register_slot, NULL, bridge, NULL);
302 if (ACPI_FAILURE(status)) {
303 list_del(&bridge->list);
307 /* install notify handler */
308 if (bridge->type != BRIDGE_TYPE_HOST) {
309 if ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func) {
310 status = acpi_remove_notify_handler(bridge->func->handle,
312 handle_hotplug_event_func);
313 if (ACPI_FAILURE(status))
314 err("failed to remove notify handler\n");
316 status = acpi_install_notify_handler(bridge->handle,
318 handle_hotplug_event_bridge,
321 if (ACPI_FAILURE(status)) {
322 err("failed to register interrupt notify handler\n");
328 /* find acpiphp_func from acpiphp_bridge */
329 static struct acpiphp_func *acpiphp_bridge_handle_to_function(acpi_handle handle)
331 struct acpiphp_bridge *bridge;
332 struct acpiphp_slot *slot;
333 struct acpiphp_func *func;
335 list_for_each_entry(bridge, &bridge_list, list) {
336 for (slot = bridge->slots; slot; slot = slot->next) {
337 list_for_each_entry(func, &slot->funcs, sibling) {
338 if (func->handle == handle)
348 static inline void config_p2p_bridge_flags(struct acpiphp_bridge *bridge)
350 acpi_handle dummy_handle;
352 if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
353 "_STA", &dummy_handle)))
354 bridge->flags |= BRIDGE_HAS_STA;
356 if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
357 "_EJ0", &dummy_handle)))
358 bridge->flags |= BRIDGE_HAS_EJ0;
360 if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
361 "_PS0", &dummy_handle)))
362 bridge->flags |= BRIDGE_HAS_PS0;
364 if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
365 "_PS3", &dummy_handle)))
366 bridge->flags |= BRIDGE_HAS_PS3;
368 /* is this ejectable p2p bridge? */
369 if (bridge->flags & BRIDGE_HAS_EJ0) {
370 struct acpiphp_func *func;
372 dbg("found ejectable p2p bridge\n");
374 /* make link between PCI bridge and PCI function */
375 func = acpiphp_bridge_handle_to_function(bridge->handle);
379 func->bridge = bridge;
384 /* allocate and initialize host bridge data structure */
385 static void add_host_bridge(acpi_handle *handle)
387 struct acpiphp_bridge *bridge;
388 struct acpi_pci_root *root = acpi_pci_find_root(handle);
390 bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
394 bridge->type = BRIDGE_TYPE_HOST;
395 bridge->handle = handle;
397 bridge->pci_bus = root->bus;
399 init_bridge_misc(bridge);
403 /* allocate and initialize PCI-to-PCI bridge data structure */
404 static void add_p2p_bridge(acpi_handle *handle)
406 struct acpiphp_bridge *bridge;
408 bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
409 if (bridge == NULL) {
410 err("out of memory\n");
414 bridge->type = BRIDGE_TYPE_P2P;
415 bridge->handle = handle;
416 config_p2p_bridge_flags(bridge);
418 bridge->pci_dev = acpi_get_pci_dev(handle);
419 bridge->pci_bus = bridge->pci_dev->subordinate;
420 if (!bridge->pci_bus) {
421 err("This is not a PCI-to-PCI bridge!\n");
426 * Grab a ref to the subordinate PCI bus in case the bus is
427 * removed via PCI core logical hotplug. The ref pins the bus
428 * (which we access during module unload).
430 get_device(&bridge->pci_bus->dev);
432 init_bridge_misc(bridge);
435 pci_dev_put(bridge->pci_dev);
441 /* callback routine to find P2P bridges */
443 find_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
448 dev = acpi_get_pci_dev(handle);
449 if (!dev || !dev->subordinate)
452 /* check if this bridge has ejectable slots */
453 if ((detect_ejectable_slots(handle) > 0)) {
454 dbg("found PCI-to-PCI bridge at PCI %s\n", pci_name(dev));
455 add_p2p_bridge(handle);
458 /* search P2P bridges under this p2p bridge */
459 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
460 find_p2p_bridge, NULL, NULL, NULL);
461 if (ACPI_FAILURE(status))
462 warn("find_p2p_bridge failed (error code = 0x%x)\n", status);
470 /* find hot-pluggable slots, and then find P2P bridge */
471 static int add_bridge(acpi_handle handle)
474 unsigned long long tmp;
475 acpi_handle dummy_handle;
477 /* if the bridge doesn't have _STA, we assume it is always there */
478 status = acpi_get_handle(handle, "_STA", &dummy_handle);
479 if (ACPI_SUCCESS(status)) {
480 status = acpi_evaluate_integer(handle, "_STA", NULL, &tmp);
481 if (ACPI_FAILURE(status)) {
482 dbg("%s: _STA evaluation failure\n", __func__);
485 if ((tmp & ACPI_STA_FUNCTIONING) == 0)
486 /* don't register this object */
490 /* check if this bridge has ejectable slots */
491 if (detect_ejectable_slots(handle) > 0) {
492 dbg("found PCI host-bus bridge with hot-pluggable slots\n");
493 add_host_bridge(handle);
496 /* search P2P bridges under this host bridge */
497 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
498 find_p2p_bridge, NULL, NULL, NULL);
500 if (ACPI_FAILURE(status))
501 warn("find_p2p_bridge failed (error code = 0x%x)\n", status);
506 static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle)
508 struct acpiphp_bridge *bridge;
510 list_for_each_entry(bridge, &bridge_list, list)
511 if (bridge->handle == handle)
517 static void cleanup_bridge(struct acpiphp_bridge *bridge)
519 struct acpiphp_slot *slot, *next;
520 struct acpiphp_func *func, *tmp;
522 acpi_handle handle = bridge->handle;
524 status = acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
525 handle_hotplug_event_bridge);
526 if (ACPI_FAILURE(status))
527 err("failed to remove notify handler\n");
529 if ((bridge->type != BRIDGE_TYPE_HOST) &&
530 ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func)) {
531 status = acpi_install_notify_handler(bridge->func->handle,
533 handle_hotplug_event_func,
535 if (ACPI_FAILURE(status))
536 err("failed to install interrupt notify handler\n");
539 slot = bridge->slots;
542 list_for_each_entry_safe(func, tmp, &slot->funcs, sibling) {
543 if (is_dock_device(func->handle)) {
544 unregister_hotplug_dock_device(func->handle);
545 unregister_dock_notifier(&func->nb);
547 if (!(func->flags & FUNC_HAS_DCK)) {
548 status = acpi_remove_notify_handler(func->handle,
550 handle_hotplug_event_func);
551 if (ACPI_FAILURE(status))
552 err("failed to remove notify handler\n");
554 list_del(&func->sibling);
557 acpiphp_unregister_hotplug_slot(slot);
558 list_del(&slot->funcs);
564 * Only P2P bridges have a pci_dev
567 put_device(&bridge->pci_bus->dev);
569 pci_dev_put(bridge->pci_dev);
570 list_del(&bridge->list);
575 cleanup_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
577 struct acpiphp_bridge *bridge;
579 /* cleanup p2p bridges under this P2P bridge
580 in a depth-first manner */
581 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
582 cleanup_p2p_bridge, NULL, NULL, NULL);
584 bridge = acpiphp_handle_to_bridge(handle);
586 cleanup_bridge(bridge);
591 static void remove_bridge(acpi_handle handle)
593 struct acpiphp_bridge *bridge;
595 /* cleanup p2p bridges under this host bridge
596 in a depth-first manner */
597 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
598 (u32)1, cleanup_p2p_bridge, NULL, NULL, NULL);
601 * On root bridges with hotplug slots directly underneath (ie,
602 * no p2p bridge between), we call cleanup_bridge().
604 * The else clause cleans up root bridges that either had no
605 * hotplug slots at all, or had a p2p bridge underneath.
607 bridge = acpiphp_handle_to_bridge(handle);
609 cleanup_bridge(bridge);
611 acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
612 handle_hotplug_event_bridge);
615 static int power_on_slot(struct acpiphp_slot *slot)
618 struct acpiphp_func *func;
621 /* if already enabled, just skip */
622 if (slot->flags & SLOT_POWEREDON)
625 list_for_each_entry(func, &slot->funcs, sibling) {
626 if (func->flags & FUNC_HAS_PS0) {
627 dbg("%s: executing _PS0\n", __func__);
628 status = acpi_evaluate_object(func->handle, "_PS0", NULL, NULL);
629 if (ACPI_FAILURE(status)) {
630 warn("%s: _PS0 failed\n", __func__);
638 /* TBD: evaluate _STA to check if the slot is enabled */
640 slot->flags |= SLOT_POWEREDON;
647 static int power_off_slot(struct acpiphp_slot *slot)
650 struct acpiphp_func *func;
654 /* if already disabled, just skip */
655 if ((slot->flags & SLOT_POWEREDON) == 0)
658 list_for_each_entry(func, &slot->funcs, sibling) {
659 if (func->flags & FUNC_HAS_PS3) {
660 status = acpi_evaluate_object(func->handle, "_PS3", NULL, NULL);
661 if (ACPI_FAILURE(status)) {
662 warn("%s: _PS3 failed\n", __func__);
670 /* TBD: evaluate _STA to check if the slot is disabled */
672 slot->flags &= (~SLOT_POWEREDON);
681 * acpiphp_max_busnr - return the highest reserved bus number under the given bus.
682 * @bus: bus to start search with
684 static unsigned char acpiphp_max_busnr(struct pci_bus *bus)
686 struct list_head *tmp;
687 unsigned char max, n;
690 * pci_bus_max_busnr will return the highest
691 * reserved busnr for all these children.
692 * that is equivalent to the bus->subordinate
693 * value. We don't want to use the parent's
694 * bus->subordinate value because it could have
697 max = bus->busn_res.start;
699 list_for_each(tmp, &bus->children) {
700 n = pci_bus_max_busnr(pci_bus_b(tmp));
709 * acpiphp_bus_add - add a new bus to acpi subsystem
710 * @func: acpiphp_func of the bridge
712 static int acpiphp_bus_add(struct acpiphp_func *func)
715 struct acpi_device *device, *pdevice;
718 acpi_get_parent(func->handle, &phandle);
719 if (acpi_bus_get_device(phandle, &pdevice)) {
720 dbg("no parent device, assuming NULL\n");
723 if (!acpi_bus_get_device(func->handle, &device)) {
724 dbg("bus exists... trim\n");
725 /* this shouldn't be in here, so remove
726 * the bus then re-add it...
728 ret_val = acpi_bus_trim(device, 1);
729 dbg("acpi_bus_trim return %x\n", ret_val);
732 ret_val = acpi_bus_add(&device, pdevice, func->handle,
733 ACPI_BUS_TYPE_DEVICE);
735 dbg("error adding bus, %x\n",
737 goto acpiphp_bus_add_out;
739 ret_val = acpi_bus_start(device);
747 * acpiphp_bus_trim - trim a bus from acpi subsystem
748 * @handle: handle to acpi namespace
750 static int acpiphp_bus_trim(acpi_handle handle)
752 struct acpi_device *device;
755 retval = acpi_bus_get_device(handle, &device);
757 dbg("acpi_device not found\n");
761 retval = acpi_bus_trim(device, 1);
763 err("cannot remove from acpi list\n");
768 static void acpiphp_set_acpi_region(struct acpiphp_slot *slot)
770 struct acpiphp_func *func;
771 union acpi_object params[2];
772 struct acpi_object_list arg_list;
774 list_for_each_entry(func, &slot->funcs, sibling) {
776 arg_list.pointer = params;
777 params[0].type = ACPI_TYPE_INTEGER;
778 params[0].integer.value = ACPI_ADR_SPACE_PCI_CONFIG;
779 params[1].type = ACPI_TYPE_INTEGER;
780 params[1].integer.value = 1;
781 /* _REG is optional, we don't care about if there is failure */
782 acpi_evaluate_object(func->handle, "_REG", &arg_list, NULL);
787 * enable_device - enable, configure a slot
788 * @slot: slot to be enabled
790 * This function should be called per *physical slot*,
791 * not per each slot object in ACPI namespace.
793 static int __ref enable_device(struct acpiphp_slot *slot)
796 struct pci_bus *bus = slot->bridge->pci_bus;
797 struct acpiphp_func *func;
802 if (slot->flags & SLOT_ENABLED)
805 num = pci_scan_slot(bus, PCI_DEVFN(slot->device, 0));
807 /* Maybe only part of funcs are added. */
808 dbg("No new device found\n");
812 max = acpiphp_max_busnr(bus);
813 for (pass = 0; pass < 2; pass++) {
814 list_for_each_entry(dev, &bus->devices, bus_list) {
815 if (PCI_SLOT(dev->devfn) != slot->device)
817 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
818 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
819 max = pci_scan_bridge(bus, dev, max, pass);
820 if (pass && dev->subordinate)
821 pci_bus_size_bridges(dev->subordinate);
826 list_for_each_entry(func, &slot->funcs, sibling)
827 acpiphp_bus_add(func);
829 pci_bus_assign_resources(bus);
830 acpiphp_sanitize_bus(bus);
831 acpiphp_set_hpp_values(bus);
832 acpiphp_set_acpi_region(slot);
833 pci_enable_bridges(bus);
835 list_for_each_entry(dev, &bus->devices, bus_list) {
836 /* Assume that newly added devices are powered on already. */
838 dev->current_state = PCI_D0;
841 pci_bus_add_devices(bus);
843 slot->flags |= SLOT_ENABLED;
844 list_for_each_entry(func, &slot->funcs, sibling) {
845 dev = pci_get_slot(bus, PCI_DEVFN(slot->device,
848 /* Do not set SLOT_ENABLED flag if some funcs
850 slot->flags &= (~SLOT_ENABLED);
854 if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE &&
855 dev->hdr_type != PCI_HEADER_TYPE_CARDBUS) {
860 status = find_p2p_bridge(func->handle, (u32)1, bus, NULL);
861 if (ACPI_FAILURE(status))
862 warn("find_p2p_bridge failed (error code = 0x%x)\n",
872 static void disable_bridges(struct pci_bus *bus)
875 list_for_each_entry(dev, &bus->devices, bus_list) {
876 if (dev->subordinate) {
877 disable_bridges(dev->subordinate);
878 pci_disable_device(dev);
883 /* return first device in slot, acquiring a reference on it */
884 static struct pci_dev *dev_in_slot(struct acpiphp_slot *slot)
886 struct pci_bus *bus = slot->bridge->pci_bus;
888 struct pci_dev *ret = NULL;
890 down_read(&pci_bus_sem);
891 list_for_each_entry(dev, &bus->devices, bus_list)
892 if (PCI_SLOT(dev->devfn) == slot->device) {
893 ret = pci_dev_get(dev);
896 up_read(&pci_bus_sem);
902 * disable_device - disable a slot
903 * @slot: ACPI PHP slot
905 static int disable_device(struct acpiphp_slot *slot)
907 struct acpiphp_func *func;
908 struct pci_dev *pdev;
909 struct pci_bus *bus = slot->bridge->pci_bus;
911 /* The slot will be enabled when func 0 is added, so check
912 func 0 before disable the slot. */
913 pdev = pci_get_slot(bus, PCI_DEVFN(slot->device, 0));
918 list_for_each_entry(func, &slot->funcs, sibling) {
920 /* cleanup p2p bridges under this P2P bridge */
921 cleanup_p2p_bridge(func->bridge->handle,
928 * enable_device() enumerates all functions in this device via
929 * pci_scan_slot(), whether they have associated ACPI hotplug
930 * methods (_EJ0, etc.) or not. Therefore, we remove all functions
933 while ((pdev = dev_in_slot(slot))) {
934 pci_stop_bus_device(pdev);
935 if (pdev->subordinate) {
936 disable_bridges(pdev->subordinate);
937 pci_disable_device(pdev);
939 __pci_remove_bus_device(pdev);
943 list_for_each_entry(func, &slot->funcs, sibling) {
944 acpiphp_bus_trim(func->handle);
947 slot->flags &= (~SLOT_ENABLED);
955 * get_slot_status - get ACPI slot status
956 * @slot: ACPI PHP slot
958 * If a slot has _STA for each function and if any one of them
959 * returned non-zero status, return it.
961 * If a slot doesn't have _STA and if any one of its functions'
962 * configuration space is configured, return 0x0f as a _STA.
964 * Otherwise return 0.
966 static unsigned int get_slot_status(struct acpiphp_slot *slot)
969 unsigned long long sta = 0;
971 struct acpiphp_func *func;
973 list_for_each_entry(func, &slot->funcs, sibling) {
974 if (func->flags & FUNC_HAS_STA) {
975 status = acpi_evaluate_integer(func->handle, "_STA", NULL, &sta);
976 if (ACPI_SUCCESS(status) && sta)
979 pci_bus_read_config_dword(slot->bridge->pci_bus,
980 PCI_DEVFN(slot->device,
982 PCI_VENDOR_ID, &dvid);
983 if (dvid != 0xffffffff) {
990 return (unsigned int)sta;
994 * acpiphp_eject_slot - physically eject the slot
995 * @slot: ACPI PHP slot
997 int acpiphp_eject_slot(struct acpiphp_slot *slot)
1000 struct acpiphp_func *func;
1001 struct acpi_object_list arg_list;
1002 union acpi_object arg;
1004 list_for_each_entry(func, &slot->funcs, sibling) {
1005 /* We don't want to call _EJ0 on non-existing functions. */
1006 if ((func->flags & FUNC_HAS_EJ0)) {
1007 /* _EJ0 method take one argument */
1009 arg_list.pointer = &arg;
1010 arg.type = ACPI_TYPE_INTEGER;
1011 arg.integer.value = 1;
1013 status = acpi_evaluate_object(func->handle, "_EJ0", &arg_list, NULL);
1014 if (ACPI_FAILURE(status)) {
1015 warn("%s: _EJ0 failed\n", __func__);
1025 * acpiphp_check_bridge - re-enumerate devices
1026 * @bridge: where to begin re-enumeration
1028 * Iterate over all slots under this bridge and make sure that if a
1029 * card is present they are enabled, and if not they are disabled.
1031 static int acpiphp_check_bridge(struct acpiphp_bridge *bridge)
1033 struct acpiphp_slot *slot;
1035 int enabled, disabled;
1037 enabled = disabled = 0;
1039 for (slot = bridge->slots; slot; slot = slot->next) {
1040 unsigned int status = get_slot_status(slot);
1041 if (slot->flags & SLOT_ENABLED) {
1042 if (status == ACPI_STA_ALL)
1044 retval = acpiphp_disable_slot(slot);
1046 err("Error occurred in disabling\n");
1049 acpiphp_eject_slot(slot);
1053 if (status != ACPI_STA_ALL)
1055 retval = acpiphp_enable_slot(slot);
1057 err("Error occurred in enabling\n");
1064 dbg("%s: %d enabled, %d disabled\n", __func__, enabled, disabled);
1070 static void acpiphp_set_hpp_values(struct pci_bus *bus)
1072 struct pci_dev *dev;
1074 list_for_each_entry(dev, &bus->devices, bus_list)
1075 pci_configure_slot(dev);
1079 * Remove devices for which we could not assign resources, call
1080 * arch specific code to fix-up the bus
1082 static void acpiphp_sanitize_bus(struct pci_bus *bus)
1084 struct pci_dev *dev;
1086 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM;
1088 list_for_each_entry(dev, &bus->devices, bus_list) {
1089 for (i=0; i<PCI_BRIDGE_RESOURCES; i++) {
1090 struct resource *res = &dev->resource[i];
1091 if ((res->flags & type_mask) && !res->start &&
1093 /* Could not assign a required resources
1094 * for this device, remove it */
1095 pci_stop_and_remove_bus_device(dev);
1102 /* Program resources in newly inserted bridge */
1103 static int acpiphp_configure_bridge (acpi_handle handle)
1105 struct pci_bus *bus;
1107 if (acpi_is_root_bridge(handle)) {
1108 struct acpi_pci_root *root = acpi_pci_find_root(handle);
1111 struct pci_dev *pdev = acpi_get_pci_dev(handle);
1112 bus = pdev->subordinate;
1116 pci_bus_size_bridges(bus);
1117 pci_bus_assign_resources(bus);
1118 acpiphp_sanitize_bus(bus);
1119 acpiphp_set_hpp_values(bus);
1120 pci_enable_bridges(bus);
1124 static void handle_bridge_insertion(acpi_handle handle, u32 type)
1126 struct acpi_device *device, *pdevice;
1127 acpi_handle phandle;
1129 if ((type != ACPI_NOTIFY_BUS_CHECK) &&
1130 (type != ACPI_NOTIFY_DEVICE_CHECK)) {
1131 err("unexpected notification type %d\n", type);
1135 acpi_get_parent(handle, &phandle);
1136 if (acpi_bus_get_device(phandle, &pdevice)) {
1137 dbg("no parent device, assuming NULL\n");
1140 if (acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE)) {
1141 err("cannot add bridge to acpi list\n");
1144 if (!acpiphp_configure_bridge(handle) &&
1145 !acpi_bus_start(device))
1148 err("cannot configure and start bridge\n");
1153 * ACPI event handlers
1157 count_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1159 int *count = (int *)context;
1160 struct acpiphp_bridge *bridge;
1162 bridge = acpiphp_handle_to_bridge(handle);
1169 check_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1171 struct acpiphp_bridge *bridge;
1173 struct acpi_buffer buffer = { .length = sizeof(objname),
1174 .pointer = objname };
1176 bridge = acpiphp_handle_to_bridge(handle);
1178 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1179 dbg("%s: re-enumerating slots under %s\n",
1181 acpiphp_check_bridge(bridge);
1186 struct acpiphp_hp_work {
1187 struct work_struct work;
1193 static void alloc_acpiphp_hp_work(acpi_handle handle, u32 type,
1195 void (*func)(struct work_struct *work))
1197 struct acpiphp_hp_work *hp_work;
1200 hp_work = kmalloc(sizeof(*hp_work), GFP_KERNEL);
1204 hp_work->handle = handle;
1205 hp_work->type = type;
1206 hp_work->context = context;
1208 INIT_WORK(&hp_work->work, func);
1209 ret = queue_work(kacpi_hotplug_wq, &hp_work->work);
1214 static void _handle_hotplug_event_bridge(struct work_struct *work)
1216 struct acpiphp_bridge *bridge;
1218 struct acpi_buffer buffer = { .length = sizeof(objname),
1219 .pointer = objname };
1220 struct acpi_device *device;
1221 int num_sub_bridges = 0;
1222 struct acpiphp_hp_work *hp_work;
1226 hp_work = container_of(work, struct acpiphp_hp_work, work);
1227 handle = hp_work->handle;
1228 type = hp_work->type;
1230 if (acpi_bus_get_device(handle, &device)) {
1231 /* This bridge must have just been physically inserted */
1232 handle_bridge_insertion(handle, type);
1236 bridge = acpiphp_handle_to_bridge(handle);
1237 if (type == ACPI_NOTIFY_BUS_CHECK) {
1238 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, ACPI_UINT32_MAX,
1239 count_sub_bridges, NULL, &num_sub_bridges, NULL);
1242 if (!bridge && !num_sub_bridges) {
1243 err("cannot get bridge info\n");
1247 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1250 case ACPI_NOTIFY_BUS_CHECK:
1251 /* bus re-enumerate */
1252 dbg("%s: Bus check notify on %s\n", __func__, objname);
1254 dbg("%s: re-enumerating slots under %s\n",
1256 acpiphp_check_bridge(bridge);
1258 if (num_sub_bridges)
1259 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
1260 ACPI_UINT32_MAX, check_sub_bridges, NULL, NULL, NULL);
1263 case ACPI_NOTIFY_DEVICE_CHECK:
1265 dbg("%s: Device check notify on %s\n", __func__, objname);
1266 acpiphp_check_bridge(bridge);
1269 case ACPI_NOTIFY_DEVICE_WAKE:
1271 dbg("%s: Device wake notify on %s\n", __func__, objname);
1274 case ACPI_NOTIFY_EJECT_REQUEST:
1275 /* request device eject */
1276 dbg("%s: Device eject notify on %s\n", __func__, objname);
1277 if ((bridge->type != BRIDGE_TYPE_HOST) &&
1278 (bridge->flags & BRIDGE_HAS_EJ0)) {
1279 struct acpiphp_slot *slot;
1280 slot = bridge->func->slot;
1281 if (!acpiphp_disable_slot(slot))
1282 acpiphp_eject_slot(slot);
1286 case ACPI_NOTIFY_FREQUENCY_MISMATCH:
1287 printk(KERN_ERR "Device %s cannot be configured due"
1288 " to a frequency mismatch\n", objname);
1291 case ACPI_NOTIFY_BUS_MODE_MISMATCH:
1292 printk(KERN_ERR "Device %s cannot be configured due"
1293 " to a bus mode mismatch\n", objname);
1296 case ACPI_NOTIFY_POWER_FAULT:
1297 printk(KERN_ERR "Device %s has suffered a power fault\n",
1302 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
1307 kfree(hp_work); /* allocated in handle_hotplug_event_bridge */
1311 * handle_hotplug_event_bridge - handle ACPI event on bridges
1312 * @handle: Notify()'ed acpi_handle
1313 * @type: Notify code
1314 * @context: pointer to acpiphp_bridge structure
1316 * Handles ACPI event notification on {host,p2p} bridges.
1318 static void handle_hotplug_event_bridge(acpi_handle handle, u32 type,
1322 * Currently the code adds all hotplug events to the kacpid_wq
1323 * queue when it should add hotplug events to the kacpi_hotplug_wq.
1324 * The proper way to fix this is to reorganize the code so that
1325 * drivers (dock, etc.) do not call acpi_os_execute(), etc.
1326 * For now just re-add this work to the kacpi_hotplug_wq so we
1327 * don't deadlock on hotplug actions.
1329 alloc_acpiphp_hp_work(handle, type, context,
1330 _handle_hotplug_event_bridge);
1333 static void _handle_hotplug_event_func(struct work_struct *work)
1335 struct acpiphp_func *func;
1337 struct acpi_buffer buffer = { .length = sizeof(objname),
1338 .pointer = objname };
1339 struct acpiphp_hp_work *hp_work;
1344 hp_work = container_of(work, struct acpiphp_hp_work, work);
1345 handle = hp_work->handle;
1346 type = hp_work->type;
1347 context = hp_work->context;
1349 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1351 func = (struct acpiphp_func *)context;
1354 case ACPI_NOTIFY_BUS_CHECK:
1355 /* bus re-enumerate */
1356 dbg("%s: Bus check notify on %s\n", __func__, objname);
1357 acpiphp_enable_slot(func->slot);
1360 case ACPI_NOTIFY_DEVICE_CHECK:
1361 /* device check : re-enumerate from parent bus */
1362 dbg("%s: Device check notify on %s\n", __func__, objname);
1363 acpiphp_check_bridge(func->slot->bridge);
1366 case ACPI_NOTIFY_DEVICE_WAKE:
1368 dbg("%s: Device wake notify on %s\n", __func__, objname);
1371 case ACPI_NOTIFY_EJECT_REQUEST:
1372 /* request device eject */
1373 dbg("%s: Device eject notify on %s\n", __func__, objname);
1374 if (!(acpiphp_disable_slot(func->slot)))
1375 acpiphp_eject_slot(func->slot);
1379 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
1383 kfree(hp_work); /* allocated in handle_hotplug_event_func */
1387 * handle_hotplug_event_func - handle ACPI event on functions (i.e. slots)
1388 * @handle: Notify()'ed acpi_handle
1389 * @type: Notify code
1390 * @context: pointer to acpiphp_func structure
1392 * Handles ACPI event notification on slots.
1394 static void handle_hotplug_event_func(acpi_handle handle, u32 type,
1398 * Currently the code adds all hotplug events to the kacpid_wq
1399 * queue when it should add hotplug events to the kacpi_hotplug_wq.
1400 * The proper way to fix this is to reorganize the code so that
1401 * drivers (dock, etc.) do not call acpi_os_execute(), etc.
1402 * For now just re-add this work to the kacpi_hotplug_wq so we
1403 * don't deadlock on hotplug actions.
1405 alloc_acpiphp_hp_work(handle, type, context,
1406 _handle_hotplug_event_func);
1410 find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1412 int *count = (int *)context;
1414 if (!acpi_is_root_bridge(handle))
1418 acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
1419 handle_hotplug_event_bridge, NULL);
1424 static struct acpi_pci_driver acpi_pci_hp_driver = {
1426 .remove = remove_bridge,
1430 * acpiphp_glue_init - initializes all PCI hotplug - ACPI glue data structures
1432 int __init acpiphp_glue_init(void)
1436 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
1437 ACPI_UINT32_MAX, find_root_bridges, NULL, &num, NULL);
1442 acpi_pci_register_driver(&acpi_pci_hp_driver);
1449 * acpiphp_glue_exit - terminates all PCI hotplug - ACPI glue data structures
1451 * This function frees all data allocated in acpiphp_glue_init().
1453 void acpiphp_glue_exit(void)
1455 acpi_pci_unregister_driver(&acpi_pci_hp_driver);
1460 * acpiphp_get_num_slots - count number of slots in a system
1462 int __init acpiphp_get_num_slots(void)
1464 struct acpiphp_bridge *bridge;
1467 list_for_each_entry(bridge, &bridge_list, list) {
1468 dbg("Bus %04x:%02x has %d slot%s\n",
1469 pci_domain_nr(bridge->pci_bus),
1470 bridge->pci_bus->number, bridge->nr_slots,
1471 bridge->nr_slots == 1 ? "" : "s");
1472 num_slots += bridge->nr_slots;
1475 dbg("Total %d slots\n", num_slots);
1482 * acpiphp_for_each_slot - call function for each slot
1483 * @fn: callback function
1484 * @data: context to be passed to callback function
1486 static int acpiphp_for_each_slot(acpiphp_callback fn, void *data)
1488 struct list_head *node;
1489 struct acpiphp_bridge *bridge;
1490 struct acpiphp_slot *slot;
1493 list_for_each (node, &bridge_list) {
1494 bridge = (struct acpiphp_bridge *)node;
1495 for (slot = bridge->slots; slot; slot = slot->next) {
1496 retval = fn(slot, data);
1509 * acpiphp_enable_slot - power on slot
1510 * @slot: ACPI PHP slot
1512 int acpiphp_enable_slot(struct acpiphp_slot *slot)
1516 mutex_lock(&slot->crit_sect);
1518 /* wake up all functions */
1519 retval = power_on_slot(slot);
1523 if (get_slot_status(slot) == ACPI_STA_ALL) {
1524 /* configure all functions */
1525 retval = enable_device(slot);
1527 power_off_slot(slot);
1529 dbg("%s: Slot status is not ACPI_STA_ALL\n", __func__);
1530 power_off_slot(slot);
1534 mutex_unlock(&slot->crit_sect);
1539 * acpiphp_disable_slot - power off slot
1540 * @slot: ACPI PHP slot
1542 int acpiphp_disable_slot(struct acpiphp_slot *slot)
1546 mutex_lock(&slot->crit_sect);
1548 /* unconfigure all functions */
1549 retval = disable_device(slot);
1553 /* power off all functions */
1554 retval = power_off_slot(slot);
1559 mutex_unlock(&slot->crit_sect);
1568 u8 acpiphp_get_power_status(struct acpiphp_slot *slot)
1570 return (slot->flags & SLOT_POWEREDON);
1578 u8 acpiphp_get_latch_status(struct acpiphp_slot *slot)
1582 sta = get_slot_status(slot);
1584 return (sta & ACPI_STA_SHOW_IN_UI) ? 0 : 1;
1589 * adapter presence : 1
1592 u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot)
1596 sta = get_slot_status(slot);
1598 return (sta == 0) ? 0 : 1;