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 /* Check whether the PCI device is managed by native PCIe hotplug driver */
119 static bool device_is_managed_by_native_pciehp(struct pci_dev *pdev)
123 struct acpi_pci_root *root;
125 /* Check whether the PCIe port supports native PCIe hotplug */
126 if (pcie_capability_read_dword(pdev, PCI_EXP_SLTCAP, ®32))
128 if (!(reg32 & PCI_EXP_SLTCAP_HPC))
132 * Check whether native PCIe hotplug has been enabled for
133 * this PCIe hierarchy.
135 tmp = acpi_find_root_bridge_handle(pdev);
138 root = acpi_pci_find_root(tmp);
141 if (!(root->osc_control_set & OSC_PCI_EXPRESS_NATIVE_HP_CONTROL))
147 /* callback routine to register each ACPI PCI slot object */
149 register_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
151 struct acpiphp_bridge *bridge = (struct acpiphp_bridge *)context;
152 struct acpiphp_slot *slot;
153 struct acpiphp_func *newfunc;
155 acpi_status status = AE_OK;
156 unsigned long long adr, sun;
157 int device, function, retval;
158 struct pci_bus *pbus = bridge->pci_bus;
159 struct pci_dev *pdev;
161 if (!acpi_pci_check_ejectable(pbus, handle) && !is_dock_device(handle))
164 status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr);
165 if (ACPI_FAILURE(status)) {
166 warn("can't evaluate _ADR (%#x)\n", status);
170 device = (adr >> 16) & 0xffff;
171 function = adr & 0xffff;
174 if (pdev && device_is_managed_by_native_pciehp(pdev))
177 newfunc = kzalloc(sizeof(struct acpiphp_func), GFP_KERNEL);
181 INIT_LIST_HEAD(&newfunc->sibling);
182 newfunc->handle = handle;
183 newfunc->function = function;
185 if (ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp)))
186 newfunc->flags = FUNC_HAS_EJ0;
188 if (ACPI_SUCCESS(acpi_get_handle(handle, "_STA", &tmp)))
189 newfunc->flags |= FUNC_HAS_STA;
191 if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS0", &tmp)))
192 newfunc->flags |= FUNC_HAS_PS0;
194 if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS3", &tmp)))
195 newfunc->flags |= FUNC_HAS_PS3;
197 if (ACPI_SUCCESS(acpi_get_handle(handle, "_DCK", &tmp)))
198 newfunc->flags |= FUNC_HAS_DCK;
200 status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun);
201 if (ACPI_FAILURE(status)) {
203 * use the count of the number of slots we've found
204 * for the number of the slot
206 sun = bridge->nr_slots+1;
209 /* search for objects that share the same slot */
210 for (slot = bridge->slots; slot; slot = slot->next)
211 if (slot->device == device) {
212 if (slot->sun != sun)
213 warn("sibling found, but _SUN doesn't match!\n");
218 slot = kzalloc(sizeof(struct acpiphp_slot), GFP_KERNEL);
224 slot->bridge = bridge;
225 slot->device = device;
227 INIT_LIST_HEAD(&slot->funcs);
228 mutex_init(&slot->crit_sect);
230 slot->next = bridge->slots;
231 bridge->slots = slot;
235 dbg("found ACPI PCI Hotplug slot %llu at PCI %04x:%02x:%02x\n",
236 slot->sun, pci_domain_nr(pbus), pbus->number, device);
237 retval = acpiphp_register_hotplug_slot(slot);
239 if (retval == -EBUSY)
240 warn("Slot %llu already registered by another "
241 "hotplug driver\n", slot->sun);
243 warn("acpiphp_register_hotplug_slot failed "
244 "(err code = 0x%x)\n", retval);
249 newfunc->slot = slot;
250 list_add_tail(&newfunc->sibling, &slot->funcs);
252 pdev = pci_get_slot(pbus, PCI_DEVFN(device, function));
254 slot->flags |= (SLOT_ENABLED | SLOT_POWEREDON);
258 if (is_dock_device(handle)) {
259 /* we don't want to call this device's _EJ0
260 * because we want the dock notify handler
261 * to call it after it calls _DCK
263 newfunc->flags &= ~FUNC_HAS_EJ0;
264 if (register_hotplug_dock_device(handle,
265 &acpiphp_dock_ops, newfunc))
266 dbg("failed to register dock device\n");
268 /* we need to be notified when dock events happen
269 * outside of the hotplug operation, since we may
270 * need to do fixups before we can hotplug.
272 newfunc->nb.notifier_call = post_dock_fixups;
273 if (register_dock_notifier(&newfunc->nb))
274 dbg("failed to register a dock notifier");
277 /* install notify handler */
278 if (!(newfunc->flags & FUNC_HAS_DCK)) {
279 status = acpi_install_notify_handler(handle,
281 handle_hotplug_event_func,
284 if (ACPI_FAILURE(status))
285 err("failed to register interrupt notify handler\n");
293 bridge->slots = slot->next;
301 /* see if it's worth looking at this bridge */
302 static int detect_ejectable_slots(acpi_handle handle)
304 int found = acpi_pci_detect_ejectable(handle);
306 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
307 is_pci_dock_device, NULL, (void *)&found, NULL);
312 /* initialize miscellaneous stuff for both root and PCI-to-PCI bridge */
313 static void init_bridge_misc(struct acpiphp_bridge *bridge)
317 /* must be added to the list prior to calling register_slot */
318 list_add(&bridge->list, &bridge_list);
320 /* register all slot objects under this bridge */
321 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge->handle, (u32)1,
322 register_slot, NULL, bridge, NULL);
323 if (ACPI_FAILURE(status)) {
324 list_del(&bridge->list);
328 /* install notify handler for P2P bridges */
329 if (!pci_is_root_bus(bridge->pci_bus)) {
330 if ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func) {
331 status = acpi_remove_notify_handler(bridge->func->handle,
333 handle_hotplug_event_func);
334 if (ACPI_FAILURE(status))
335 err("failed to remove notify handler\n");
337 status = acpi_install_notify_handler(bridge->handle,
339 handle_hotplug_event_bridge,
342 if (ACPI_FAILURE(status)) {
343 err("failed to register interrupt notify handler\n");
349 /* find acpiphp_func from acpiphp_bridge */
350 static struct acpiphp_func *acpiphp_bridge_handle_to_function(acpi_handle handle)
352 struct acpiphp_bridge *bridge;
353 struct acpiphp_slot *slot;
354 struct acpiphp_func *func;
356 list_for_each_entry(bridge, &bridge_list, list) {
357 for (slot = bridge->slots; slot; slot = slot->next) {
358 list_for_each_entry(func, &slot->funcs, sibling) {
359 if (func->handle == handle)
369 static inline void config_p2p_bridge_flags(struct acpiphp_bridge *bridge)
371 acpi_handle dummy_handle;
372 struct acpiphp_func *func;
374 if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
375 "_EJ0", &dummy_handle))) {
376 bridge->flags |= BRIDGE_HAS_EJ0;
378 dbg("found ejectable p2p bridge\n");
380 /* make link between PCI bridge and PCI function */
381 func = acpiphp_bridge_handle_to_function(bridge->handle);
385 func->bridge = bridge;
390 /* allocate and initialize host bridge data structure */
391 static void add_host_bridge(struct acpi_pci_root *root)
393 struct acpiphp_bridge *bridge;
394 acpi_handle handle = root->device->handle;
396 bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
400 bridge->handle = handle;
402 bridge->pci_bus = root->bus;
404 init_bridge_misc(bridge);
408 /* allocate and initialize PCI-to-PCI bridge data structure */
409 static void add_p2p_bridge(acpi_handle *handle)
411 struct acpiphp_bridge *bridge;
413 bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
414 if (bridge == NULL) {
415 err("out of memory\n");
419 bridge->handle = handle;
420 config_p2p_bridge_flags(bridge);
422 bridge->pci_dev = acpi_get_pci_dev(handle);
423 bridge->pci_bus = bridge->pci_dev->subordinate;
424 if (!bridge->pci_bus) {
425 err("This is not a PCI-to-PCI bridge!\n");
430 * Grab a ref to the subordinate PCI bus in case the bus is
431 * removed via PCI core logical hotplug. The ref pins the bus
432 * (which we access during module unload).
434 get_device(&bridge->pci_bus->dev);
436 init_bridge_misc(bridge);
439 pci_dev_put(bridge->pci_dev);
445 /* callback routine to find P2P bridges */
447 find_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
452 dev = acpi_get_pci_dev(handle);
453 if (!dev || !dev->subordinate)
456 /* check if this bridge has ejectable slots */
457 if ((detect_ejectable_slots(handle) > 0)) {
458 dbg("found PCI-to-PCI bridge at PCI %s\n", pci_name(dev));
459 add_p2p_bridge(handle);
462 /* search P2P bridges under this p2p bridge */
463 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
464 find_p2p_bridge, NULL, NULL, NULL);
465 if (ACPI_FAILURE(status))
466 warn("find_p2p_bridge failed (error code = 0x%x)\n", status);
474 /* find hot-pluggable slots, and then find P2P bridge */
475 static int add_bridge(struct acpi_pci_root *root)
478 unsigned long long tmp;
479 acpi_handle dummy_handle;
480 acpi_handle handle = root->device->handle;
482 /* if the bridge doesn't have _STA, we assume it is always there */
483 status = acpi_get_handle(handle, "_STA", &dummy_handle);
484 if (ACPI_SUCCESS(status)) {
485 status = acpi_evaluate_integer(handle, "_STA", NULL, &tmp);
486 if (ACPI_FAILURE(status)) {
487 dbg("%s: _STA evaluation failure\n", __func__);
490 if ((tmp & ACPI_STA_FUNCTIONING) == 0)
491 /* don't register this object */
495 /* check if this bridge has ejectable slots */
496 if (detect_ejectable_slots(handle) > 0) {
497 dbg("found PCI host-bus bridge with hot-pluggable slots\n");
498 add_host_bridge(root);
501 /* search P2P bridges under this host bridge */
502 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
503 find_p2p_bridge, NULL, NULL, NULL);
505 if (ACPI_FAILURE(status))
506 warn("find_p2p_bridge failed (error code = 0x%x)\n", status);
511 static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle)
513 struct acpiphp_bridge *bridge;
515 list_for_each_entry(bridge, &bridge_list, list)
516 if (bridge->handle == handle)
522 static void cleanup_bridge(struct acpiphp_bridge *bridge)
524 struct acpiphp_slot *slot, *next;
525 struct acpiphp_func *func, *tmp;
527 acpi_handle handle = bridge->handle;
529 if (!pci_is_root_bus(bridge->pci_bus)) {
530 status = acpi_remove_notify_handler(handle,
532 handle_hotplug_event_bridge);
533 if (ACPI_FAILURE(status))
534 err("failed to remove notify handler\n");
537 if ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func) {
538 status = acpi_install_notify_handler(bridge->func->handle,
540 handle_hotplug_event_func,
542 if (ACPI_FAILURE(status))
543 err("failed to install interrupt notify handler\n");
546 slot = bridge->slots;
549 list_for_each_entry_safe(func, tmp, &slot->funcs, sibling) {
550 if (is_dock_device(func->handle)) {
551 unregister_hotplug_dock_device(func->handle);
552 unregister_dock_notifier(&func->nb);
554 if (!(func->flags & FUNC_HAS_DCK)) {
555 status = acpi_remove_notify_handler(func->handle,
557 handle_hotplug_event_func);
558 if (ACPI_FAILURE(status))
559 err("failed to remove notify handler\n");
561 list_del(&func->sibling);
564 acpiphp_unregister_hotplug_slot(slot);
565 list_del(&slot->funcs);
571 * Only P2P bridges have a pci_dev
574 put_device(&bridge->pci_bus->dev);
576 pci_dev_put(bridge->pci_dev);
577 list_del(&bridge->list);
582 cleanup_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
584 struct acpiphp_bridge *bridge;
586 /* cleanup p2p bridges under this P2P bridge
587 in a depth-first manner */
588 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
589 cleanup_p2p_bridge, NULL, NULL, NULL);
591 bridge = acpiphp_handle_to_bridge(handle);
593 cleanup_bridge(bridge);
598 static void remove_bridge(struct acpi_pci_root *root)
600 struct acpiphp_bridge *bridge;
601 acpi_handle handle = root->device->handle;
603 /* cleanup p2p bridges under this host bridge
604 in a depth-first manner */
605 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
606 (u32)1, cleanup_p2p_bridge, NULL, NULL, NULL);
609 * On root bridges with hotplug slots directly underneath (ie,
610 * no p2p bridge between), we call cleanup_bridge().
612 * The else clause cleans up root bridges that either had no
613 * hotplug slots at all, or had a p2p bridge underneath.
615 bridge = acpiphp_handle_to_bridge(handle);
617 cleanup_bridge(bridge);
620 static int power_on_slot(struct acpiphp_slot *slot)
623 struct acpiphp_func *func;
626 /* if already enabled, just skip */
627 if (slot->flags & SLOT_POWEREDON)
630 list_for_each_entry(func, &slot->funcs, sibling) {
631 if (func->flags & FUNC_HAS_PS0) {
632 dbg("%s: executing _PS0\n", __func__);
633 status = acpi_evaluate_object(func->handle, "_PS0", NULL, NULL);
634 if (ACPI_FAILURE(status)) {
635 warn("%s: _PS0 failed\n", __func__);
643 /* TBD: evaluate _STA to check if the slot is enabled */
645 slot->flags |= SLOT_POWEREDON;
652 static int power_off_slot(struct acpiphp_slot *slot)
655 struct acpiphp_func *func;
659 /* if already disabled, just skip */
660 if ((slot->flags & SLOT_POWEREDON) == 0)
663 list_for_each_entry(func, &slot->funcs, sibling) {
664 if (func->flags & FUNC_HAS_PS3) {
665 status = acpi_evaluate_object(func->handle, "_PS3", NULL, NULL);
666 if (ACPI_FAILURE(status)) {
667 warn("%s: _PS3 failed\n", __func__);
675 /* TBD: evaluate _STA to check if the slot is disabled */
677 slot->flags &= (~SLOT_POWEREDON);
686 * acpiphp_max_busnr - return the highest reserved bus number under the given bus.
687 * @bus: bus to start search with
689 static unsigned char acpiphp_max_busnr(struct pci_bus *bus)
691 struct list_head *tmp;
692 unsigned char max, n;
695 * pci_bus_max_busnr will return the highest
696 * reserved busnr for all these children.
697 * that is equivalent to the bus->subordinate
698 * value. We don't want to use the parent's
699 * bus->subordinate value because it could have
702 max = bus->busn_res.start;
704 list_for_each(tmp, &bus->children) {
705 n = pci_bus_max_busnr(pci_bus_b(tmp));
714 * acpiphp_bus_add - add a new bus to acpi subsystem
715 * @func: acpiphp_func of the bridge
717 static int acpiphp_bus_add(struct acpiphp_func *func)
719 struct acpi_device *device;
722 if (!acpi_bus_get_device(func->handle, &device)) {
723 dbg("bus exists... trim\n");
724 /* this shouldn't be in here, so remove
725 * the bus then re-add it...
727 ret_val = acpi_bus_trim(device);
728 dbg("acpi_bus_trim return %x\n", ret_val);
731 ret_val = acpi_bus_scan(func->handle);
733 ret_val = acpi_bus_get_device(func->handle, &device);
736 dbg("error adding bus, %x\n", -ret_val);
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);
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);
782 static void check_hotplug_bridge(struct acpiphp_slot *slot, struct pci_dev *dev)
784 struct acpiphp_func *func;
786 if (!dev->subordinate)
789 /* quirk, or pcie could set it already */
790 if (dev->is_hotplug_bridge)
793 if (PCI_SLOT(dev->devfn) != slot->device)
796 list_for_each_entry(func, &slot->funcs, sibling) {
797 if (PCI_FUNC(dev->devfn) == func->function) {
798 /* check if this bridge has ejectable slots */
799 if ((detect_ejectable_slots(func->handle) > 0))
800 dev->is_hotplug_bridge = 1;
806 * enable_device - enable, configure a slot
807 * @slot: slot to be enabled
809 * This function should be called per *physical slot*,
810 * not per each slot object in ACPI namespace.
812 static int __ref enable_device(struct acpiphp_slot *slot)
815 struct pci_bus *bus = slot->bridge->pci_bus;
816 struct acpiphp_func *func;
821 if (slot->flags & SLOT_ENABLED)
824 list_for_each_entry(func, &slot->funcs, sibling)
825 acpiphp_bus_add(func);
827 num = pci_scan_slot(bus, PCI_DEVFN(slot->device, 0));
829 /* Maybe only part of funcs are added. */
830 dbg("No new device found\n");
834 max = acpiphp_max_busnr(bus);
835 for (pass = 0; pass < 2; pass++) {
836 list_for_each_entry(dev, &bus->devices, bus_list) {
837 if (PCI_SLOT(dev->devfn) != slot->device)
839 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
840 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
841 max = pci_scan_bridge(bus, dev, max, pass);
842 if (pass && dev->subordinate) {
843 check_hotplug_bridge(slot, dev);
844 pci_bus_size_bridges(dev->subordinate);
850 pci_bus_assign_resources(bus);
851 acpiphp_sanitize_bus(bus);
852 acpiphp_set_hpp_values(bus);
853 acpiphp_set_acpi_region(slot);
854 pci_enable_bridges(bus);
856 list_for_each_entry(dev, &bus->devices, bus_list) {
857 /* Assume that newly added devices are powered on already. */
859 dev->current_state = PCI_D0;
862 pci_bus_add_devices(bus);
864 slot->flags |= SLOT_ENABLED;
865 list_for_each_entry(func, &slot->funcs, sibling) {
866 dev = pci_get_slot(bus, PCI_DEVFN(slot->device,
869 /* Do not set SLOT_ENABLED flag if some funcs
871 slot->flags &= (~SLOT_ENABLED);
875 if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE &&
876 dev->hdr_type != PCI_HEADER_TYPE_CARDBUS) {
881 status = find_p2p_bridge(func->handle, (u32)1, bus, NULL);
882 if (ACPI_FAILURE(status))
883 warn("find_p2p_bridge failed (error code = 0x%x)\n",
893 /* return first device in slot, acquiring a reference on it */
894 static struct pci_dev *dev_in_slot(struct acpiphp_slot *slot)
896 struct pci_bus *bus = slot->bridge->pci_bus;
898 struct pci_dev *ret = NULL;
900 down_read(&pci_bus_sem);
901 list_for_each_entry(dev, &bus->devices, bus_list)
902 if (PCI_SLOT(dev->devfn) == slot->device) {
903 ret = pci_dev_get(dev);
906 up_read(&pci_bus_sem);
912 * disable_device - disable a slot
913 * @slot: ACPI PHP slot
915 static int disable_device(struct acpiphp_slot *slot)
917 struct acpiphp_func *func;
918 struct pci_dev *pdev;
919 struct pci_bus *bus = slot->bridge->pci_bus;
921 /* The slot will be enabled when func 0 is added, so check
922 func 0 before disable the slot. */
923 pdev = pci_get_slot(bus, PCI_DEVFN(slot->device, 0));
928 list_for_each_entry(func, &slot->funcs, sibling) {
930 /* cleanup p2p bridges under this P2P bridge */
931 cleanup_p2p_bridge(func->bridge->handle,
938 * enable_device() enumerates all functions in this device via
939 * pci_scan_slot(), whether they have associated ACPI hotplug
940 * methods (_EJ0, etc.) or not. Therefore, we remove all functions
943 while ((pdev = dev_in_slot(slot))) {
944 pci_stop_and_remove_bus_device(pdev);
948 list_for_each_entry(func, &slot->funcs, sibling) {
949 acpiphp_bus_trim(func->handle);
952 slot->flags &= (~SLOT_ENABLED);
960 * get_slot_status - get ACPI slot status
961 * @slot: ACPI PHP slot
963 * If a slot has _STA for each function and if any one of them
964 * returned non-zero status, return it.
966 * If a slot doesn't have _STA and if any one of its functions'
967 * configuration space is configured, return 0x0f as a _STA.
969 * Otherwise return 0.
971 static unsigned int get_slot_status(struct acpiphp_slot *slot)
974 unsigned long long sta = 0;
976 struct acpiphp_func *func;
978 list_for_each_entry(func, &slot->funcs, sibling) {
979 if (func->flags & FUNC_HAS_STA) {
980 status = acpi_evaluate_integer(func->handle, "_STA", NULL, &sta);
981 if (ACPI_SUCCESS(status) && sta)
984 pci_bus_read_config_dword(slot->bridge->pci_bus,
985 PCI_DEVFN(slot->device,
987 PCI_VENDOR_ID, &dvid);
988 if (dvid != 0xffffffff) {
995 return (unsigned int)sta;
999 * acpiphp_eject_slot - physically eject the slot
1000 * @slot: ACPI PHP slot
1002 int acpiphp_eject_slot(struct acpiphp_slot *slot)
1005 struct acpiphp_func *func;
1006 struct acpi_object_list arg_list;
1007 union acpi_object arg;
1009 list_for_each_entry(func, &slot->funcs, sibling) {
1010 /* We don't want to call _EJ0 on non-existing functions. */
1011 if ((func->flags & FUNC_HAS_EJ0)) {
1012 /* _EJ0 method take one argument */
1014 arg_list.pointer = &arg;
1015 arg.type = ACPI_TYPE_INTEGER;
1016 arg.integer.value = 1;
1018 status = acpi_evaluate_object(func->handle, "_EJ0", &arg_list, NULL);
1019 if (ACPI_FAILURE(status)) {
1020 warn("%s: _EJ0 failed\n", __func__);
1030 * acpiphp_check_bridge - re-enumerate devices
1031 * @bridge: where to begin re-enumeration
1033 * Iterate over all slots under this bridge and make sure that if a
1034 * card is present they are enabled, and if not they are disabled.
1036 static int acpiphp_check_bridge(struct acpiphp_bridge *bridge)
1038 struct acpiphp_slot *slot;
1040 int enabled, disabled;
1042 enabled = disabled = 0;
1044 for (slot = bridge->slots; slot; slot = slot->next) {
1045 unsigned int status = get_slot_status(slot);
1046 if (slot->flags & SLOT_ENABLED) {
1047 if (status == ACPI_STA_ALL)
1049 retval = acpiphp_disable_slot(slot);
1051 err("Error occurred in disabling\n");
1054 acpiphp_eject_slot(slot);
1058 if (status != ACPI_STA_ALL)
1060 retval = acpiphp_enable_slot(slot);
1062 err("Error occurred in enabling\n");
1069 dbg("%s: %d enabled, %d disabled\n", __func__, enabled, disabled);
1075 static void acpiphp_set_hpp_values(struct pci_bus *bus)
1077 struct pci_dev *dev;
1079 list_for_each_entry(dev, &bus->devices, bus_list)
1080 pci_configure_slot(dev);
1084 * Remove devices for which we could not assign resources, call
1085 * arch specific code to fix-up the bus
1087 static void acpiphp_sanitize_bus(struct pci_bus *bus)
1089 struct pci_dev *dev;
1091 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM;
1093 list_for_each_entry(dev, &bus->devices, bus_list) {
1094 for (i=0; i<PCI_BRIDGE_RESOURCES; i++) {
1095 struct resource *res = &dev->resource[i];
1096 if ((res->flags & type_mask) && !res->start &&
1098 /* Could not assign a required resources
1099 * for this device, remove it */
1100 pci_stop_and_remove_bus_device(dev);
1108 * ACPI event handlers
1112 check_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1114 struct acpiphp_bridge *bridge;
1116 struct acpi_buffer buffer = { .length = sizeof(objname),
1117 .pointer = objname };
1119 bridge = acpiphp_handle_to_bridge(handle);
1121 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1122 dbg("%s: re-enumerating slots under %s\n",
1124 acpiphp_check_bridge(bridge);
1129 static void _handle_hotplug_event_bridge(struct work_struct *work)
1131 struct acpiphp_bridge *bridge;
1133 struct acpi_buffer buffer = { .length = sizeof(objname),
1134 .pointer = objname };
1135 struct acpi_hp_work *hp_work;
1139 hp_work = container_of(work, struct acpi_hp_work, work);
1140 handle = hp_work->handle;
1141 type = hp_work->type;
1142 bridge = (struct acpiphp_bridge *)hp_work->context;
1144 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1147 case ACPI_NOTIFY_BUS_CHECK:
1148 /* bus re-enumerate */
1149 dbg("%s: Bus check notify on %s\n", __func__, objname);
1150 dbg("%s: re-enumerating slots under %s\n", __func__, objname);
1151 acpiphp_check_bridge(bridge);
1152 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
1153 ACPI_UINT32_MAX, check_sub_bridges, NULL, NULL, NULL);
1156 case ACPI_NOTIFY_DEVICE_CHECK:
1158 dbg("%s: Device check notify on %s\n", __func__, objname);
1159 acpiphp_check_bridge(bridge);
1162 case ACPI_NOTIFY_DEVICE_WAKE:
1164 dbg("%s: Device wake notify on %s\n", __func__, objname);
1167 case ACPI_NOTIFY_EJECT_REQUEST:
1168 /* request device eject */
1169 dbg("%s: Device eject notify on %s\n", __func__, objname);
1170 if ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func) {
1171 struct acpiphp_slot *slot;
1172 slot = bridge->func->slot;
1173 if (!acpiphp_disable_slot(slot))
1174 acpiphp_eject_slot(slot);
1178 case ACPI_NOTIFY_FREQUENCY_MISMATCH:
1179 printk(KERN_ERR "Device %s cannot be configured due"
1180 " to a frequency mismatch\n", objname);
1183 case ACPI_NOTIFY_BUS_MODE_MISMATCH:
1184 printk(KERN_ERR "Device %s cannot be configured due"
1185 " to a bus mode mismatch\n", objname);
1188 case ACPI_NOTIFY_POWER_FAULT:
1189 printk(KERN_ERR "Device %s has suffered a power fault\n",
1194 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
1198 kfree(hp_work); /* allocated in handle_hotplug_event_bridge */
1202 * handle_hotplug_event_bridge - handle ACPI event on bridges
1203 * @handle: Notify()'ed acpi_handle
1204 * @type: Notify code
1205 * @context: pointer to acpiphp_bridge structure
1207 * Handles ACPI event notification on {host,p2p} bridges.
1209 static void handle_hotplug_event_bridge(acpi_handle handle, u32 type,
1213 * Currently the code adds all hotplug events to the kacpid_wq
1214 * queue when it should add hotplug events to the kacpi_hotplug_wq.
1215 * The proper way to fix this is to reorganize the code so that
1216 * drivers (dock, etc.) do not call acpi_os_execute(), etc.
1217 * For now just re-add this work to the kacpi_hotplug_wq so we
1218 * don't deadlock on hotplug actions.
1220 alloc_acpi_hp_work(handle, type, context, _handle_hotplug_event_bridge);
1223 static void _handle_hotplug_event_func(struct work_struct *work)
1225 struct acpiphp_func *func;
1227 struct acpi_buffer buffer = { .length = sizeof(objname),
1228 .pointer = objname };
1229 struct acpi_hp_work *hp_work;
1233 hp_work = container_of(work, struct acpi_hp_work, work);
1234 handle = hp_work->handle;
1235 type = hp_work->type;
1236 func = (struct acpiphp_func *)hp_work->context;
1238 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1241 case ACPI_NOTIFY_BUS_CHECK:
1242 /* bus re-enumerate */
1243 dbg("%s: Bus check notify on %s\n", __func__, objname);
1244 acpiphp_enable_slot(func->slot);
1247 case ACPI_NOTIFY_DEVICE_CHECK:
1248 /* device check : re-enumerate from parent bus */
1249 dbg("%s: Device check notify on %s\n", __func__, objname);
1250 acpiphp_check_bridge(func->slot->bridge);
1253 case ACPI_NOTIFY_DEVICE_WAKE:
1255 dbg("%s: Device wake notify on %s\n", __func__, objname);
1258 case ACPI_NOTIFY_EJECT_REQUEST:
1259 /* request device eject */
1260 dbg("%s: Device eject notify on %s\n", __func__, objname);
1261 if (!(acpiphp_disable_slot(func->slot)))
1262 acpiphp_eject_slot(func->slot);
1266 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
1270 kfree(hp_work); /* allocated in handle_hotplug_event_func */
1274 * handle_hotplug_event_func - handle ACPI event on functions (i.e. slots)
1275 * @handle: Notify()'ed acpi_handle
1276 * @type: Notify code
1277 * @context: pointer to acpiphp_func structure
1279 * Handles ACPI event notification on slots.
1281 static void handle_hotplug_event_func(acpi_handle handle, u32 type,
1285 * Currently the code adds all hotplug events to the kacpid_wq
1286 * queue when it should add hotplug events to the kacpi_hotplug_wq.
1287 * The proper way to fix this is to reorganize the code so that
1288 * drivers (dock, etc.) do not call acpi_os_execute(), etc.
1289 * For now just re-add this work to the kacpi_hotplug_wq so we
1290 * don't deadlock on hotplug actions.
1292 alloc_acpi_hp_work(handle, type, context, _handle_hotplug_event_func);
1295 static struct acpi_pci_driver acpi_pci_hp_driver = {
1297 .remove = remove_bridge,
1301 * acpiphp_glue_init - initializes all PCI hotplug - ACPI glue data structures
1303 int __init acpiphp_glue_init(void)
1305 acpi_pci_register_driver(&acpi_pci_hp_driver);
1312 * acpiphp_glue_exit - terminates all PCI hotplug - ACPI glue data structures
1314 * This function frees all data allocated in acpiphp_glue_init().
1316 void acpiphp_glue_exit(void)
1318 acpi_pci_unregister_driver(&acpi_pci_hp_driver);
1322 * acpiphp_enable_slot - power on slot
1323 * @slot: ACPI PHP slot
1325 int acpiphp_enable_slot(struct acpiphp_slot *slot)
1329 mutex_lock(&slot->crit_sect);
1331 /* wake up all functions */
1332 retval = power_on_slot(slot);
1336 if (get_slot_status(slot) == ACPI_STA_ALL) {
1337 /* configure all functions */
1338 retval = enable_device(slot);
1340 power_off_slot(slot);
1342 dbg("%s: Slot status is not ACPI_STA_ALL\n", __func__);
1343 power_off_slot(slot);
1347 mutex_unlock(&slot->crit_sect);
1352 * acpiphp_disable_slot - power off slot
1353 * @slot: ACPI PHP slot
1355 int acpiphp_disable_slot(struct acpiphp_slot *slot)
1359 mutex_lock(&slot->crit_sect);
1361 /* unconfigure all functions */
1362 retval = disable_device(slot);
1366 /* power off all functions */
1367 retval = power_off_slot(slot);
1372 mutex_unlock(&slot->crit_sect);
1381 u8 acpiphp_get_power_status(struct acpiphp_slot *slot)
1383 return (slot->flags & SLOT_POWEREDON);
1391 u8 acpiphp_get_latch_status(struct acpiphp_slot *slot)
1395 sta = get_slot_status(slot);
1397 return (sta & ACPI_STA_SHOW_IN_UI) ? 0 : 1;
1402 * adapter presence : 1
1405 u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot)
1409 sta = get_slot_status(slot);
1411 return (sta == 0) ? 0 : 1;