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 */
329 if (bridge->type != BRIDGE_TYPE_HOST) {
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;
373 if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
374 "_STA", &dummy_handle)))
375 bridge->flags |= BRIDGE_HAS_STA;
377 if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
378 "_EJ0", &dummy_handle)))
379 bridge->flags |= BRIDGE_HAS_EJ0;
381 if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
382 "_PS0", &dummy_handle)))
383 bridge->flags |= BRIDGE_HAS_PS0;
385 if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
386 "_PS3", &dummy_handle)))
387 bridge->flags |= BRIDGE_HAS_PS3;
389 /* is this ejectable p2p bridge? */
390 if (bridge->flags & BRIDGE_HAS_EJ0) {
391 struct acpiphp_func *func;
393 dbg("found ejectable p2p bridge\n");
395 /* make link between PCI bridge and PCI function */
396 func = acpiphp_bridge_handle_to_function(bridge->handle);
400 func->bridge = bridge;
405 /* allocate and initialize host bridge data structure */
406 static void add_host_bridge(struct acpi_pci_root *root)
408 struct acpiphp_bridge *bridge;
409 acpi_handle handle = root->device->handle;
411 bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
415 bridge->type = BRIDGE_TYPE_HOST;
416 bridge->handle = handle;
418 bridge->pci_bus = root->bus;
420 init_bridge_misc(bridge);
424 /* allocate and initialize PCI-to-PCI bridge data structure */
425 static void add_p2p_bridge(acpi_handle *handle)
427 struct acpiphp_bridge *bridge;
429 bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
430 if (bridge == NULL) {
431 err("out of memory\n");
435 bridge->type = BRIDGE_TYPE_P2P;
436 bridge->handle = handle;
437 config_p2p_bridge_flags(bridge);
439 bridge->pci_dev = acpi_get_pci_dev(handle);
440 bridge->pci_bus = bridge->pci_dev->subordinate;
441 if (!bridge->pci_bus) {
442 err("This is not a PCI-to-PCI bridge!\n");
447 * Grab a ref to the subordinate PCI bus in case the bus is
448 * removed via PCI core logical hotplug. The ref pins the bus
449 * (which we access during module unload).
451 get_device(&bridge->pci_bus->dev);
453 init_bridge_misc(bridge);
456 pci_dev_put(bridge->pci_dev);
462 /* callback routine to find P2P bridges */
464 find_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
469 dev = acpi_get_pci_dev(handle);
470 if (!dev || !dev->subordinate)
473 /* check if this bridge has ejectable slots */
474 if ((detect_ejectable_slots(handle) > 0)) {
475 dbg("found PCI-to-PCI bridge at PCI %s\n", pci_name(dev));
476 add_p2p_bridge(handle);
479 /* search P2P bridges under this p2p bridge */
480 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
481 find_p2p_bridge, NULL, NULL, NULL);
482 if (ACPI_FAILURE(status))
483 warn("find_p2p_bridge failed (error code = 0x%x)\n", status);
491 /* find hot-pluggable slots, and then find P2P bridge */
492 static int add_bridge(struct acpi_pci_root *root)
495 unsigned long long tmp;
496 acpi_handle dummy_handle;
497 acpi_handle handle = root->device->handle;
499 /* if the bridge doesn't have _STA, we assume it is always there */
500 status = acpi_get_handle(handle, "_STA", &dummy_handle);
501 if (ACPI_SUCCESS(status)) {
502 status = acpi_evaluate_integer(handle, "_STA", NULL, &tmp);
503 if (ACPI_FAILURE(status)) {
504 dbg("%s: _STA evaluation failure\n", __func__);
507 if ((tmp & ACPI_STA_FUNCTIONING) == 0)
508 /* don't register this object */
512 /* check if this bridge has ejectable slots */
513 if (detect_ejectable_slots(handle) > 0) {
514 dbg("found PCI host-bus bridge with hot-pluggable slots\n");
515 add_host_bridge(root);
518 /* search P2P bridges under this host bridge */
519 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
520 find_p2p_bridge, NULL, NULL, NULL);
522 if (ACPI_FAILURE(status))
523 warn("find_p2p_bridge failed (error code = 0x%x)\n", status);
528 static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle)
530 struct acpiphp_bridge *bridge;
532 list_for_each_entry(bridge, &bridge_list, list)
533 if (bridge->handle == handle)
539 static void cleanup_bridge(struct acpiphp_bridge *bridge)
541 struct acpiphp_slot *slot, *next;
542 struct acpiphp_func *func, *tmp;
544 acpi_handle handle = bridge->handle;
546 status = acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
547 handle_hotplug_event_bridge);
548 if (ACPI_FAILURE(status))
549 err("failed to remove notify handler\n");
551 if ((bridge->type != BRIDGE_TYPE_HOST) &&
552 ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func)) {
553 status = acpi_install_notify_handler(bridge->func->handle,
555 handle_hotplug_event_func,
557 if (ACPI_FAILURE(status))
558 err("failed to install interrupt notify handler\n");
561 slot = bridge->slots;
564 list_for_each_entry_safe(func, tmp, &slot->funcs, sibling) {
565 if (is_dock_device(func->handle)) {
566 unregister_hotplug_dock_device(func->handle);
567 unregister_dock_notifier(&func->nb);
569 if (!(func->flags & FUNC_HAS_DCK)) {
570 status = acpi_remove_notify_handler(func->handle,
572 handle_hotplug_event_func);
573 if (ACPI_FAILURE(status))
574 err("failed to remove notify handler\n");
576 list_del(&func->sibling);
579 acpiphp_unregister_hotplug_slot(slot);
580 list_del(&slot->funcs);
586 * Only P2P bridges have a pci_dev
589 put_device(&bridge->pci_bus->dev);
591 pci_dev_put(bridge->pci_dev);
592 list_del(&bridge->list);
597 cleanup_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
599 struct acpiphp_bridge *bridge;
601 /* cleanup p2p bridges under this P2P bridge
602 in a depth-first manner */
603 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
604 cleanup_p2p_bridge, NULL, NULL, NULL);
606 bridge = acpiphp_handle_to_bridge(handle);
608 cleanup_bridge(bridge);
613 static void remove_bridge(struct acpi_pci_root *root)
615 struct acpiphp_bridge *bridge;
616 acpi_handle handle = root->device->handle;
618 /* cleanup p2p bridges under this host bridge
619 in a depth-first manner */
620 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
621 (u32)1, cleanup_p2p_bridge, NULL, NULL, NULL);
624 * On root bridges with hotplug slots directly underneath (ie,
625 * no p2p bridge between), we call cleanup_bridge().
627 * The else clause cleans up root bridges that either had no
628 * hotplug slots at all, or had a p2p bridge underneath.
630 bridge = acpiphp_handle_to_bridge(handle);
632 cleanup_bridge(bridge);
634 acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
635 handle_hotplug_event_bridge);
638 static int power_on_slot(struct acpiphp_slot *slot)
641 struct acpiphp_func *func;
644 /* if already enabled, just skip */
645 if (slot->flags & SLOT_POWEREDON)
648 list_for_each_entry(func, &slot->funcs, sibling) {
649 if (func->flags & FUNC_HAS_PS0) {
650 dbg("%s: executing _PS0\n", __func__);
651 status = acpi_evaluate_object(func->handle, "_PS0", NULL, NULL);
652 if (ACPI_FAILURE(status)) {
653 warn("%s: _PS0 failed\n", __func__);
661 /* TBD: evaluate _STA to check if the slot is enabled */
663 slot->flags |= SLOT_POWEREDON;
670 static int power_off_slot(struct acpiphp_slot *slot)
673 struct acpiphp_func *func;
677 /* if already disabled, just skip */
678 if ((slot->flags & SLOT_POWEREDON) == 0)
681 list_for_each_entry(func, &slot->funcs, sibling) {
682 if (func->flags & FUNC_HAS_PS3) {
683 status = acpi_evaluate_object(func->handle, "_PS3", NULL, NULL);
684 if (ACPI_FAILURE(status)) {
685 warn("%s: _PS3 failed\n", __func__);
693 /* TBD: evaluate _STA to check if the slot is disabled */
695 slot->flags &= (~SLOT_POWEREDON);
704 * acpiphp_max_busnr - return the highest reserved bus number under the given bus.
705 * @bus: bus to start search with
707 static unsigned char acpiphp_max_busnr(struct pci_bus *bus)
709 struct list_head *tmp;
710 unsigned char max, n;
713 * pci_bus_max_busnr will return the highest
714 * reserved busnr for all these children.
715 * that is equivalent to the bus->subordinate
716 * value. We don't want to use the parent's
717 * bus->subordinate value because it could have
720 max = bus->busn_res.start;
722 list_for_each(tmp, &bus->children) {
723 n = pci_bus_max_busnr(pci_bus_b(tmp));
732 * acpiphp_bus_add - add a new bus to acpi subsystem
733 * @func: acpiphp_func of the bridge
735 static int acpiphp_bus_add(struct acpiphp_func *func)
737 struct acpi_device *device;
740 if (!acpi_bus_get_device(func->handle, &device)) {
741 dbg("bus exists... trim\n");
742 /* this shouldn't be in here, so remove
743 * the bus then re-add it...
745 acpi_bus_trim(device);
748 ret_val = acpi_bus_scan(func->handle);
750 ret_val = acpi_bus_get_device(func->handle, &device);
753 dbg("error adding bus, %x\n", -ret_val);
760 * acpiphp_bus_trim - trim a bus from acpi subsystem
761 * @handle: handle to acpi namespace
763 static int acpiphp_bus_trim(acpi_handle handle)
765 struct acpi_device *device;
768 retval = acpi_bus_get_device(handle, &device);
770 dbg("acpi_device not found\n");
774 acpi_bus_trim(device);
778 static void acpiphp_set_acpi_region(struct acpiphp_slot *slot)
780 struct acpiphp_func *func;
781 union acpi_object params[2];
782 struct acpi_object_list arg_list;
784 list_for_each_entry(func, &slot->funcs, sibling) {
786 arg_list.pointer = params;
787 params[0].type = ACPI_TYPE_INTEGER;
788 params[0].integer.value = ACPI_ADR_SPACE_PCI_CONFIG;
789 params[1].type = ACPI_TYPE_INTEGER;
790 params[1].integer.value = 1;
791 /* _REG is optional, we don't care about if there is failure */
792 acpi_evaluate_object(func->handle, "_REG", &arg_list, NULL);
797 * enable_device - enable, configure a slot
798 * @slot: slot to be enabled
800 * This function should be called per *physical slot*,
801 * not per each slot object in ACPI namespace.
803 static int __ref enable_device(struct acpiphp_slot *slot)
806 struct pci_bus *bus = slot->bridge->pci_bus;
807 struct acpiphp_func *func;
812 if (slot->flags & SLOT_ENABLED)
815 num = pci_scan_slot(bus, PCI_DEVFN(slot->device, 0));
817 /* Maybe only part of funcs are added. */
818 dbg("No new device found\n");
822 max = acpiphp_max_busnr(bus);
823 for (pass = 0; pass < 2; pass++) {
824 list_for_each_entry(dev, &bus->devices, bus_list) {
825 if (PCI_SLOT(dev->devfn) != slot->device)
827 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
828 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
829 max = pci_scan_bridge(bus, dev, max, pass);
830 if (pass && dev->subordinate)
831 pci_bus_size_bridges(dev->subordinate);
836 list_for_each_entry(func, &slot->funcs, sibling)
837 acpiphp_bus_add(func);
839 pci_bus_assign_resources(bus);
840 acpiphp_sanitize_bus(bus);
841 acpiphp_set_hpp_values(bus);
842 acpiphp_set_acpi_region(slot);
843 pci_enable_bridges(bus);
845 list_for_each_entry(dev, &bus->devices, bus_list) {
846 /* Assume that newly added devices are powered on already. */
848 dev->current_state = PCI_D0;
851 pci_bus_add_devices(bus);
853 slot->flags |= SLOT_ENABLED;
854 list_for_each_entry(func, &slot->funcs, sibling) {
855 dev = pci_get_slot(bus, PCI_DEVFN(slot->device,
858 /* Do not set SLOT_ENABLED flag if some funcs
860 slot->flags &= (~SLOT_ENABLED);
864 if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE &&
865 dev->hdr_type != PCI_HEADER_TYPE_CARDBUS) {
870 status = find_p2p_bridge(func->handle, (u32)1, bus, NULL);
871 if (ACPI_FAILURE(status))
872 warn("find_p2p_bridge failed (error code = 0x%x)\n",
882 /* return first device in slot, acquiring a reference on it */
883 static struct pci_dev *dev_in_slot(struct acpiphp_slot *slot)
885 struct pci_bus *bus = slot->bridge->pci_bus;
887 struct pci_dev *ret = NULL;
889 down_read(&pci_bus_sem);
890 list_for_each_entry(dev, &bus->devices, bus_list)
891 if (PCI_SLOT(dev->devfn) == slot->device) {
892 ret = pci_dev_get(dev);
895 up_read(&pci_bus_sem);
901 * disable_device - disable a slot
902 * @slot: ACPI PHP slot
904 static int disable_device(struct acpiphp_slot *slot)
906 struct acpiphp_func *func;
907 struct pci_dev *pdev;
908 struct pci_bus *bus = slot->bridge->pci_bus;
910 /* The slot will be enabled when func 0 is added, so check
911 func 0 before disable the slot. */
912 pdev = pci_get_slot(bus, PCI_DEVFN(slot->device, 0));
917 list_for_each_entry(func, &slot->funcs, sibling) {
919 /* cleanup p2p bridges under this P2P bridge */
920 cleanup_p2p_bridge(func->bridge->handle,
927 * enable_device() enumerates all functions in this device via
928 * pci_scan_slot(), whether they have associated ACPI hotplug
929 * methods (_EJ0, etc.) or not. Therefore, we remove all functions
932 while ((pdev = dev_in_slot(slot))) {
933 pci_stop_and_remove_bus_device(pdev);
937 list_for_each_entry(func, &slot->funcs, sibling) {
938 acpiphp_bus_trim(func->handle);
941 slot->flags &= (~SLOT_ENABLED);
949 * get_slot_status - get ACPI slot status
950 * @slot: ACPI PHP slot
952 * If a slot has _STA for each function and if any one of them
953 * returned non-zero status, return it.
955 * If a slot doesn't have _STA and if any one of its functions'
956 * configuration space is configured, return 0x0f as a _STA.
958 * Otherwise return 0.
960 static unsigned int get_slot_status(struct acpiphp_slot *slot)
963 unsigned long long sta = 0;
965 struct acpiphp_func *func;
967 list_for_each_entry(func, &slot->funcs, sibling) {
968 if (func->flags & FUNC_HAS_STA) {
969 status = acpi_evaluate_integer(func->handle, "_STA", NULL, &sta);
970 if (ACPI_SUCCESS(status) && sta)
973 pci_bus_read_config_dword(slot->bridge->pci_bus,
974 PCI_DEVFN(slot->device,
976 PCI_VENDOR_ID, &dvid);
977 if (dvid != 0xffffffff) {
984 return (unsigned int)sta;
988 * acpiphp_eject_slot - physically eject the slot
989 * @slot: ACPI PHP slot
991 int acpiphp_eject_slot(struct acpiphp_slot *slot)
994 struct acpiphp_func *func;
995 struct acpi_object_list arg_list;
996 union acpi_object arg;
998 list_for_each_entry(func, &slot->funcs, sibling) {
999 /* We don't want to call _EJ0 on non-existing functions. */
1000 if ((func->flags & FUNC_HAS_EJ0)) {
1001 /* _EJ0 method take one argument */
1003 arg_list.pointer = &arg;
1004 arg.type = ACPI_TYPE_INTEGER;
1005 arg.integer.value = 1;
1007 status = acpi_evaluate_object(func->handle, "_EJ0", &arg_list, NULL);
1008 if (ACPI_FAILURE(status)) {
1009 warn("%s: _EJ0 failed\n", __func__);
1019 * acpiphp_check_bridge - re-enumerate devices
1020 * @bridge: where to begin re-enumeration
1022 * Iterate over all slots under this bridge and make sure that if a
1023 * card is present they are enabled, and if not they are disabled.
1025 static int acpiphp_check_bridge(struct acpiphp_bridge *bridge)
1027 struct acpiphp_slot *slot;
1029 int enabled, disabled;
1031 enabled = disabled = 0;
1033 for (slot = bridge->slots; slot; slot = slot->next) {
1034 unsigned int status = get_slot_status(slot);
1035 if (slot->flags & SLOT_ENABLED) {
1036 if (status == ACPI_STA_ALL)
1038 retval = acpiphp_disable_slot(slot);
1040 err("Error occurred in disabling\n");
1043 acpiphp_eject_slot(slot);
1047 if (status != ACPI_STA_ALL)
1049 retval = acpiphp_enable_slot(slot);
1051 err("Error occurred in enabling\n");
1058 dbg("%s: %d enabled, %d disabled\n", __func__, enabled, disabled);
1064 static void acpiphp_set_hpp_values(struct pci_bus *bus)
1066 struct pci_dev *dev;
1068 list_for_each_entry(dev, &bus->devices, bus_list)
1069 pci_configure_slot(dev);
1073 * Remove devices for which we could not assign resources, call
1074 * arch specific code to fix-up the bus
1076 static void acpiphp_sanitize_bus(struct pci_bus *bus)
1078 struct pci_dev *dev;
1080 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM;
1082 list_for_each_entry(dev, &bus->devices, bus_list) {
1083 for (i=0; i<PCI_BRIDGE_RESOURCES; i++) {
1084 struct resource *res = &dev->resource[i];
1085 if ((res->flags & type_mask) && !res->start &&
1087 /* Could not assign a required resources
1088 * for this device, remove it */
1089 pci_stop_and_remove_bus_device(dev);
1096 /* Program resources in newly inserted bridge */
1097 static int acpiphp_configure_bridge (acpi_handle handle)
1099 struct pci_bus *bus;
1101 if (acpi_is_root_bridge(handle)) {
1102 struct acpi_pci_root *root = acpi_pci_find_root(handle);
1105 struct pci_dev *pdev = acpi_get_pci_dev(handle);
1106 bus = pdev->subordinate;
1110 pci_bus_size_bridges(bus);
1111 pci_bus_assign_resources(bus);
1112 acpiphp_sanitize_bus(bus);
1113 acpiphp_set_hpp_values(bus);
1114 pci_enable_bridges(bus);
1118 static void handle_bridge_insertion(acpi_handle handle, u32 type)
1120 struct acpi_device *device;
1122 if ((type != ACPI_NOTIFY_BUS_CHECK) &&
1123 (type != ACPI_NOTIFY_DEVICE_CHECK)) {
1124 err("unexpected notification type %d\n", type);
1128 if (acpi_bus_scan(handle)) {
1129 err("cannot add bridge to acpi list\n");
1132 if (acpi_bus_get_device(handle, &device)) {
1133 err("ACPI device object missing\n");
1136 if (!acpiphp_configure_bridge(handle))
1139 err("cannot configure and start bridge\n");
1144 * ACPI event handlers
1148 count_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1150 int *count = (int *)context;
1151 struct acpiphp_bridge *bridge;
1153 bridge = acpiphp_handle_to_bridge(handle);
1160 check_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1162 struct acpiphp_bridge *bridge;
1164 struct acpi_buffer buffer = { .length = sizeof(objname),
1165 .pointer = objname };
1167 bridge = acpiphp_handle_to_bridge(handle);
1169 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1170 dbg("%s: re-enumerating slots under %s\n",
1172 acpiphp_check_bridge(bridge);
1177 struct acpiphp_hp_work {
1178 struct work_struct work;
1184 static void alloc_acpiphp_hp_work(acpi_handle handle, u32 type,
1186 void (*func)(struct work_struct *work))
1188 struct acpiphp_hp_work *hp_work;
1191 hp_work = kmalloc(sizeof(*hp_work), GFP_KERNEL);
1195 hp_work->handle = handle;
1196 hp_work->type = type;
1197 hp_work->context = context;
1199 INIT_WORK(&hp_work->work, func);
1200 ret = queue_work(kacpi_hotplug_wq, &hp_work->work);
1205 static void _handle_hotplug_event_bridge(struct work_struct *work)
1207 struct acpiphp_bridge *bridge;
1209 struct acpi_buffer buffer = { .length = sizeof(objname),
1210 .pointer = objname };
1211 struct acpi_device *device;
1212 int num_sub_bridges = 0;
1213 struct acpiphp_hp_work *hp_work;
1217 hp_work = container_of(work, struct acpiphp_hp_work, work);
1218 handle = hp_work->handle;
1219 type = hp_work->type;
1221 acpi_scan_lock_acquire();
1223 if (acpi_bus_get_device(handle, &device)) {
1224 /* This bridge must have just been physically inserted */
1225 handle_bridge_insertion(handle, type);
1229 bridge = acpiphp_handle_to_bridge(handle);
1230 if (type == ACPI_NOTIFY_BUS_CHECK) {
1231 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, ACPI_UINT32_MAX,
1232 count_sub_bridges, NULL, &num_sub_bridges, NULL);
1235 if (!bridge && !num_sub_bridges) {
1236 err("cannot get bridge info\n");
1240 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1243 case ACPI_NOTIFY_BUS_CHECK:
1244 /* bus re-enumerate */
1245 dbg("%s: Bus check notify on %s\n", __func__, objname);
1247 dbg("%s: re-enumerating slots under %s\n",
1249 acpiphp_check_bridge(bridge);
1251 if (num_sub_bridges)
1252 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
1253 ACPI_UINT32_MAX, check_sub_bridges, NULL, NULL, NULL);
1256 case ACPI_NOTIFY_DEVICE_CHECK:
1258 dbg("%s: Device check notify on %s\n", __func__, objname);
1259 acpiphp_check_bridge(bridge);
1262 case ACPI_NOTIFY_DEVICE_WAKE:
1264 dbg("%s: Device wake notify on %s\n", __func__, objname);
1267 case ACPI_NOTIFY_EJECT_REQUEST:
1268 /* request device eject */
1269 dbg("%s: Device eject notify on %s\n", __func__, objname);
1270 if ((bridge->type != BRIDGE_TYPE_HOST) &&
1271 (bridge->flags & BRIDGE_HAS_EJ0)) {
1272 struct acpiphp_slot *slot;
1273 slot = bridge->func->slot;
1274 if (!acpiphp_disable_slot(slot))
1275 acpiphp_eject_slot(slot);
1279 case ACPI_NOTIFY_FREQUENCY_MISMATCH:
1280 printk(KERN_ERR "Device %s cannot be configured due"
1281 " to a frequency mismatch\n", objname);
1284 case ACPI_NOTIFY_BUS_MODE_MISMATCH:
1285 printk(KERN_ERR "Device %s cannot be configured due"
1286 " to a bus mode mismatch\n", objname);
1289 case ACPI_NOTIFY_POWER_FAULT:
1290 printk(KERN_ERR "Device %s has suffered a power fault\n",
1295 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
1300 acpi_scan_lock_release();
1301 kfree(hp_work); /* allocated in handle_hotplug_event_bridge */
1305 * handle_hotplug_event_bridge - handle ACPI event on bridges
1306 * @handle: Notify()'ed acpi_handle
1307 * @type: Notify code
1308 * @context: pointer to acpiphp_bridge structure
1310 * Handles ACPI event notification on {host,p2p} bridges.
1312 static void handle_hotplug_event_bridge(acpi_handle handle, u32 type,
1316 * Currently the code adds all hotplug events to the kacpid_wq
1317 * queue when it should add hotplug events to the kacpi_hotplug_wq.
1318 * The proper way to fix this is to reorganize the code so that
1319 * drivers (dock, etc.) do not call acpi_os_execute(), etc.
1320 * For now just re-add this work to the kacpi_hotplug_wq so we
1321 * don't deadlock on hotplug actions.
1323 alloc_acpiphp_hp_work(handle, type, context,
1324 _handle_hotplug_event_bridge);
1327 static void _handle_hotplug_event_func(struct work_struct *work)
1329 struct acpiphp_func *func;
1331 struct acpi_buffer buffer = { .length = sizeof(objname),
1332 .pointer = objname };
1333 struct acpiphp_hp_work *hp_work;
1338 hp_work = container_of(work, struct acpiphp_hp_work, work);
1339 handle = hp_work->handle;
1340 type = hp_work->type;
1341 context = hp_work->context;
1343 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1345 func = (struct acpiphp_func *)context;
1347 acpi_scan_lock_acquire();
1350 case ACPI_NOTIFY_BUS_CHECK:
1351 /* bus re-enumerate */
1352 dbg("%s: Bus check notify on %s\n", __func__, objname);
1353 acpiphp_enable_slot(func->slot);
1356 case ACPI_NOTIFY_DEVICE_CHECK:
1357 /* device check : re-enumerate from parent bus */
1358 dbg("%s: Device check notify on %s\n", __func__, objname);
1359 acpiphp_check_bridge(func->slot->bridge);
1362 case ACPI_NOTIFY_DEVICE_WAKE:
1364 dbg("%s: Device wake notify on %s\n", __func__, objname);
1367 case ACPI_NOTIFY_EJECT_REQUEST:
1368 /* request device eject */
1369 dbg("%s: Device eject notify on %s\n", __func__, objname);
1370 if (!(acpiphp_disable_slot(func->slot)))
1371 acpiphp_eject_slot(func->slot);
1375 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
1379 acpi_scan_lock_release();
1380 kfree(hp_work); /* allocated in handle_hotplug_event_func */
1384 * handle_hotplug_event_func - handle ACPI event on functions (i.e. slots)
1385 * @handle: Notify()'ed acpi_handle
1386 * @type: Notify code
1387 * @context: pointer to acpiphp_func structure
1389 * Handles ACPI event notification on slots.
1391 static void handle_hotplug_event_func(acpi_handle handle, u32 type,
1395 * Currently the code adds all hotplug events to the kacpid_wq
1396 * queue when it should add hotplug events to the kacpi_hotplug_wq.
1397 * The proper way to fix this is to reorganize the code so that
1398 * drivers (dock, etc.) do not call acpi_os_execute(), etc.
1399 * For now just re-add this work to the kacpi_hotplug_wq so we
1400 * don't deadlock on hotplug actions.
1402 alloc_acpiphp_hp_work(handle, type, context,
1403 _handle_hotplug_event_func);
1407 find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1409 int *count = (int *)context;
1411 if (!acpi_is_root_bridge(handle))
1415 acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
1416 handle_hotplug_event_bridge, NULL);
1421 static struct acpi_pci_driver acpi_pci_hp_driver = {
1423 .remove = remove_bridge,
1427 * acpiphp_glue_init - initializes all PCI hotplug - ACPI glue data structures
1429 int __init acpiphp_glue_init(void)
1433 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
1434 ACPI_UINT32_MAX, find_root_bridges, NULL, &num, NULL);
1439 acpi_pci_register_driver(&acpi_pci_hp_driver);
1446 * acpiphp_glue_exit - terminates all PCI hotplug - ACPI glue data structures
1448 * This function frees all data allocated in acpiphp_glue_init().
1450 void acpiphp_glue_exit(void)
1452 acpi_pci_unregister_driver(&acpi_pci_hp_driver);
1457 * acpiphp_get_num_slots - count number of slots in a system
1459 int __init acpiphp_get_num_slots(void)
1461 struct acpiphp_bridge *bridge;
1464 list_for_each_entry(bridge, &bridge_list, list) {
1465 dbg("Bus %04x:%02x has %d slot%s\n",
1466 pci_domain_nr(bridge->pci_bus),
1467 bridge->pci_bus->number, bridge->nr_slots,
1468 bridge->nr_slots == 1 ? "" : "s");
1469 num_slots += bridge->nr_slots;
1472 dbg("Total %d slots\n", num_slots);
1478 * acpiphp_enable_slot - power on slot
1479 * @slot: ACPI PHP slot
1481 int acpiphp_enable_slot(struct acpiphp_slot *slot)
1485 mutex_lock(&slot->crit_sect);
1487 /* wake up all functions */
1488 retval = power_on_slot(slot);
1492 if (get_slot_status(slot) == ACPI_STA_ALL) {
1493 /* configure all functions */
1494 retval = enable_device(slot);
1496 power_off_slot(slot);
1498 dbg("%s: Slot status is not ACPI_STA_ALL\n", __func__);
1499 power_off_slot(slot);
1503 mutex_unlock(&slot->crit_sect);
1508 * acpiphp_disable_slot - power off slot
1509 * @slot: ACPI PHP slot
1511 int acpiphp_disable_slot(struct acpiphp_slot *slot)
1515 mutex_lock(&slot->crit_sect);
1517 /* unconfigure all functions */
1518 retval = disable_device(slot);
1522 /* power off all functions */
1523 retval = power_off_slot(slot);
1528 mutex_unlock(&slot->crit_sect);
1537 u8 acpiphp_get_power_status(struct acpiphp_slot *slot)
1539 return (slot->flags & SLOT_POWEREDON);
1547 u8 acpiphp_get_latch_status(struct acpiphp_slot *slot)
1551 sta = get_slot_status(slot);
1553 return (sta & ACPI_STA_SHOW_IN_UI) ? 0 : 1;
1558 * adapter presence : 1
1561 u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot)
1565 sta = get_slot_status(slot);
1567 return (sta == 0) ? 0 : 1;