Merge branch 'r6040-next'
[linux/fpc-iii.git] / drivers / pci / hotplug / acpiphp_glue.c
blobfa49f9143b80631108e10ef78e5e45e285c40cf8
1 /*
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
23 * details.
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
37 * is removed.
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 #define pr_fmt(fmt) "acpiphp_glue: " fmt
44 #include <linux/module.h>
46 #include <linux/kernel.h>
47 #include <linux/pci.h>
48 #include <linux/pci_hotplug.h>
49 #include <linux/pci-acpi.h>
50 #include <linux/pm_runtime.h>
51 #include <linux/mutex.h>
52 #include <linux/slab.h>
53 #include <linux/acpi.h>
55 #include "../pci.h"
56 #include "acpiphp.h"
58 static LIST_HEAD(bridge_list);
59 static DEFINE_MUTEX(bridge_mutex);
61 static int acpiphp_hotplug_notify(struct acpi_device *adev, u32 type);
62 static void acpiphp_post_dock_fixup(struct acpi_device *adev);
63 static void acpiphp_sanitize_bus(struct pci_bus *bus);
64 static void hotplug_event(u32 type, struct acpiphp_context *context);
65 static void free_bridge(struct kref *kref);
67 /**
68 * acpiphp_init_context - Create hotplug context and grab a reference to it.
69 * @adev: ACPI device object to create the context for.
71 * Call under acpi_hp_context_lock.
73 static struct acpiphp_context *acpiphp_init_context(struct acpi_device *adev)
75 struct acpiphp_context *context;
77 context = kzalloc(sizeof(*context), GFP_KERNEL);
78 if (!context)
79 return NULL;
81 context->refcount = 1;
82 context->hp.notify = acpiphp_hotplug_notify;
83 context->hp.fixup = acpiphp_post_dock_fixup;
84 acpi_set_hp_context(adev, &context->hp);
85 return context;
88 /**
89 * acpiphp_get_context - Get hotplug context and grab a reference to it.
90 * @adev: ACPI device object to get the context for.
92 * Call under acpi_hp_context_lock.
94 static struct acpiphp_context *acpiphp_get_context(struct acpi_device *adev)
96 struct acpiphp_context *context;
98 if (!adev->hp)
99 return NULL;
101 context = to_acpiphp_context(adev->hp);
102 context->refcount++;
103 return context;
107 * acpiphp_put_context - Drop a reference to ACPI hotplug context.
108 * @context: ACPI hotplug context to drop a reference to.
110 * The context object is removed if there are no more references to it.
112 * Call under acpi_hp_context_lock.
114 static void acpiphp_put_context(struct acpiphp_context *context)
116 if (--context->refcount)
117 return;
119 WARN_ON(context->bridge);
120 context->hp.self->hp = NULL;
121 kfree(context);
124 static inline void get_bridge(struct acpiphp_bridge *bridge)
126 kref_get(&bridge->ref);
129 static inline void put_bridge(struct acpiphp_bridge *bridge)
131 kref_put(&bridge->ref, free_bridge);
134 static struct acpiphp_context *acpiphp_grab_context(struct acpi_device *adev)
136 struct acpiphp_context *context;
138 acpi_lock_hp_context();
139 context = acpiphp_get_context(adev);
140 if (!context || context->func.parent->is_going_away) {
141 acpi_unlock_hp_context();
142 return NULL;
144 get_bridge(context->func.parent);
145 acpiphp_put_context(context);
146 acpi_unlock_hp_context();
147 return context;
150 static void acpiphp_let_context_go(struct acpiphp_context *context)
152 put_bridge(context->func.parent);
155 static void free_bridge(struct kref *kref)
157 struct acpiphp_context *context;
158 struct acpiphp_bridge *bridge;
159 struct acpiphp_slot *slot, *next;
160 struct acpiphp_func *func, *tmp;
162 acpi_lock_hp_context();
164 bridge = container_of(kref, struct acpiphp_bridge, ref);
166 list_for_each_entry_safe(slot, next, &bridge->slots, node) {
167 list_for_each_entry_safe(func, tmp, &slot->funcs, sibling)
168 acpiphp_put_context(func_to_context(func));
170 kfree(slot);
173 context = bridge->context;
174 /* Root bridges will not have hotplug context. */
175 if (context) {
176 /* Release the reference taken by acpiphp_enumerate_slots(). */
177 put_bridge(context->func.parent);
178 context->bridge = NULL;
179 acpiphp_put_context(context);
182 put_device(&bridge->pci_bus->dev);
183 pci_dev_put(bridge->pci_dev);
184 kfree(bridge);
186 acpi_unlock_hp_context();
190 * acpiphp_post_dock_fixup - Post-dock fixups for PCI devices.
191 * @adev: ACPI device object corresponding to a PCI device.
193 * TBD - figure out a way to only call fixups for systems that require them.
195 static void acpiphp_post_dock_fixup(struct acpi_device *adev)
197 struct acpiphp_context *context = acpiphp_grab_context(adev);
198 struct pci_bus *bus;
199 u32 buses;
201 if (!context)
202 return;
204 bus = context->func.slot->bus;
205 if (!bus->self)
206 goto out;
208 /* fixup bad _DCK function that rewrites
209 * secondary bridge on slot
211 pci_read_config_dword(bus->self, PCI_PRIMARY_BUS, &buses);
213 if (((buses >> 8) & 0xff) != bus->busn_res.start) {
214 buses = (buses & 0xff000000)
215 | ((unsigned int)(bus->primary) << 0)
216 | ((unsigned int)(bus->busn_res.start) << 8)
217 | ((unsigned int)(bus->busn_res.end) << 16);
218 pci_write_config_dword(bus->self, PCI_PRIMARY_BUS, buses);
221 out:
222 acpiphp_let_context_go(context);
225 /* Check whether the PCI device is managed by native PCIe hotplug driver */
226 static bool device_is_managed_by_native_pciehp(struct pci_dev *pdev)
228 u32 reg32;
229 acpi_handle tmp;
230 struct acpi_pci_root *root;
232 /* Check whether the PCIe port supports native PCIe hotplug */
233 if (pcie_capability_read_dword(pdev, PCI_EXP_SLTCAP, &reg32))
234 return false;
235 if (!(reg32 & PCI_EXP_SLTCAP_HPC))
236 return false;
239 * Check whether native PCIe hotplug has been enabled for
240 * this PCIe hierarchy.
242 tmp = acpi_find_root_bridge_handle(pdev);
243 if (!tmp)
244 return false;
245 root = acpi_pci_find_root(tmp);
246 if (!root)
247 return false;
248 if (!(root->osc_control_set & OSC_PCI_EXPRESS_NATIVE_HP_CONTROL))
249 return false;
251 return true;
255 * acpiphp_add_context - Add ACPIPHP context to an ACPI device object.
256 * @handle: ACPI handle of the object to add a context to.
257 * @lvl: Not used.
258 * @data: The object's parent ACPIPHP bridge.
259 * @rv: Not used.
261 static acpi_status acpiphp_add_context(acpi_handle handle, u32 lvl, void *data,
262 void **rv)
264 struct acpiphp_bridge *bridge = data;
265 struct acpiphp_context *context;
266 struct acpi_device *adev;
267 struct acpiphp_slot *slot;
268 struct acpiphp_func *newfunc;
269 acpi_status status = AE_OK;
270 unsigned long long adr;
271 int device, function;
272 struct pci_bus *pbus = bridge->pci_bus;
273 struct pci_dev *pdev = bridge->pci_dev;
274 u32 val;
276 status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr);
277 if (ACPI_FAILURE(status)) {
278 if (status != AE_NOT_FOUND)
279 acpi_handle_warn(handle,
280 "can't evaluate _ADR (%#x)\n", status);
281 return AE_OK;
283 if (acpi_bus_get_device(handle, &adev))
284 return AE_OK;
286 device = (adr >> 16) & 0xffff;
287 function = adr & 0xffff;
289 acpi_lock_hp_context();
290 context = acpiphp_init_context(adev);
291 if (!context) {
292 acpi_unlock_hp_context();
293 acpi_handle_err(handle, "No hotplug context\n");
294 return AE_NOT_EXIST;
296 newfunc = &context->func;
297 newfunc->function = function;
298 newfunc->parent = bridge;
299 acpi_unlock_hp_context();
302 * If this is a dock device, its _EJ0 should be executed by the dock
303 * notify handler after calling _DCK.
305 if (!is_dock_device(adev) && acpi_has_method(handle, "_EJ0"))
306 newfunc->flags = FUNC_HAS_EJ0;
308 if (acpi_has_method(handle, "_STA"))
309 newfunc->flags |= FUNC_HAS_STA;
311 /* search for objects that share the same slot */
312 list_for_each_entry(slot, &bridge->slots, node)
313 if (slot->device == device)
314 goto slot_found;
316 slot = kzalloc(sizeof(struct acpiphp_slot), GFP_KERNEL);
317 if (!slot) {
318 acpi_lock_hp_context();
319 acpiphp_put_context(context);
320 acpi_unlock_hp_context();
321 return AE_NO_MEMORY;
324 slot->bus = bridge->pci_bus;
325 slot->device = device;
326 INIT_LIST_HEAD(&slot->funcs);
328 list_add_tail(&slot->node, &bridge->slots);
331 * Expose slots to user space for functions that have _EJ0 or _RMV or
332 * are located in dock stations. Do not expose them for devices handled
333 * by the native PCIe hotplug (PCIeHP), becuase that code is supposed to
334 * expose slots to user space in those cases.
336 if ((acpi_pci_check_ejectable(pbus, handle) || is_dock_device(adev))
337 && !(pdev && device_is_managed_by_native_pciehp(pdev))) {
338 unsigned long long sun;
339 int retval;
341 bridge->nr_slots++;
342 status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun);
343 if (ACPI_FAILURE(status))
344 sun = bridge->nr_slots;
346 pr_debug("found ACPI PCI Hotplug slot %llu at PCI %04x:%02x:%02x\n",
347 sun, pci_domain_nr(pbus), pbus->number, device);
349 retval = acpiphp_register_hotplug_slot(slot, sun);
350 if (retval) {
351 slot->slot = NULL;
352 bridge->nr_slots--;
353 if (retval == -EBUSY)
354 pr_warn("Slot %llu already registered by another hotplug driver\n", sun);
355 else
356 pr_warn("acpiphp_register_hotplug_slot failed (err code = 0x%x)\n", retval);
358 /* Even if the slot registration fails, we can still use it. */
361 slot_found:
362 newfunc->slot = slot;
363 list_add_tail(&newfunc->sibling, &slot->funcs);
365 if (pci_bus_read_dev_vendor_id(pbus, PCI_DEVFN(device, function),
366 &val, 60*1000))
367 slot->flags |= SLOT_ENABLED;
369 return AE_OK;
372 static void cleanup_bridge(struct acpiphp_bridge *bridge)
374 struct acpiphp_slot *slot;
375 struct acpiphp_func *func;
377 list_for_each_entry(slot, &bridge->slots, node) {
378 list_for_each_entry(func, &slot->funcs, sibling) {
379 struct acpi_device *adev = func_to_acpi_device(func);
381 acpi_lock_hp_context();
382 adev->hp->notify = NULL;
383 adev->hp->fixup = NULL;
384 acpi_unlock_hp_context();
386 slot->flags |= SLOT_IS_GOING_AWAY;
387 if (slot->slot)
388 acpiphp_unregister_hotplug_slot(slot);
391 mutex_lock(&bridge_mutex);
392 list_del(&bridge->list);
393 mutex_unlock(&bridge_mutex);
395 acpi_lock_hp_context();
396 bridge->is_going_away = true;
397 acpi_unlock_hp_context();
401 * acpiphp_max_busnr - return the highest reserved bus number under the given bus.
402 * @bus: bus to start search with
404 static unsigned char acpiphp_max_busnr(struct pci_bus *bus)
406 struct pci_bus *tmp;
407 unsigned char max, n;
410 * pci_bus_max_busnr will return the highest
411 * reserved busnr for all these children.
412 * that is equivalent to the bus->subordinate
413 * value. We don't want to use the parent's
414 * bus->subordinate value because it could have
415 * padding in it.
417 max = bus->busn_res.start;
419 list_for_each_entry(tmp, &bus->children, node) {
420 n = pci_bus_max_busnr(tmp);
421 if (n > max)
422 max = n;
424 return max;
427 static void acpiphp_set_acpi_region(struct acpiphp_slot *slot)
429 struct acpiphp_func *func;
430 union acpi_object params[2];
431 struct acpi_object_list arg_list;
433 list_for_each_entry(func, &slot->funcs, sibling) {
434 arg_list.count = 2;
435 arg_list.pointer = params;
436 params[0].type = ACPI_TYPE_INTEGER;
437 params[0].integer.value = ACPI_ADR_SPACE_PCI_CONFIG;
438 params[1].type = ACPI_TYPE_INTEGER;
439 params[1].integer.value = 1;
440 /* _REG is optional, we don't care about if there is failure */
441 acpi_evaluate_object(func_to_handle(func), "_REG", &arg_list,
442 NULL);
446 static void check_hotplug_bridge(struct acpiphp_slot *slot, struct pci_dev *dev)
448 struct acpiphp_func *func;
450 /* quirk, or pcie could set it already */
451 if (dev->is_hotplug_bridge)
452 return;
454 list_for_each_entry(func, &slot->funcs, sibling) {
455 if (PCI_FUNC(dev->devfn) == func->function) {
456 dev->is_hotplug_bridge = 1;
457 break;
462 static int acpiphp_rescan_slot(struct acpiphp_slot *slot)
464 struct acpiphp_func *func;
466 list_for_each_entry(func, &slot->funcs, sibling) {
467 struct acpi_device *adev = func_to_acpi_device(func);
469 acpi_bus_scan(adev->handle);
470 if (acpi_device_enumerated(adev))
471 acpi_device_set_power(adev, ACPI_STATE_D0);
473 return pci_scan_slot(slot->bus, PCI_DEVFN(slot->device, 0));
477 * enable_slot - enable, configure a slot
478 * @slot: slot to be enabled
480 * This function should be called per *physical slot*,
481 * not per each slot object in ACPI namespace.
483 static void enable_slot(struct acpiphp_slot *slot)
485 struct pci_dev *dev;
486 struct pci_bus *bus = slot->bus;
487 struct acpiphp_func *func;
488 int max, pass;
489 LIST_HEAD(add_list);
491 acpiphp_rescan_slot(slot);
492 max = acpiphp_max_busnr(bus);
493 for (pass = 0; pass < 2; pass++) {
494 list_for_each_entry(dev, &bus->devices, bus_list) {
495 if (PCI_SLOT(dev->devfn) != slot->device)
496 continue;
498 if (pci_is_bridge(dev)) {
499 max = pci_scan_bridge(bus, dev, max, pass);
500 if (pass && dev->subordinate) {
501 check_hotplug_bridge(slot, dev);
502 pcibios_resource_survey_bus(dev->subordinate);
503 __pci_bus_size_bridges(dev->subordinate,
504 &add_list);
509 __pci_bus_assign_resources(bus, &add_list, NULL);
511 acpiphp_sanitize_bus(bus);
512 pcie_bus_configure_settings(bus);
513 acpiphp_set_acpi_region(slot);
515 list_for_each_entry(dev, &bus->devices, bus_list) {
516 /* Assume that newly added devices are powered on already. */
517 if (!dev->is_added)
518 dev->current_state = PCI_D0;
521 pci_bus_add_devices(bus);
523 slot->flags |= SLOT_ENABLED;
524 list_for_each_entry(func, &slot->funcs, sibling) {
525 dev = pci_get_slot(bus, PCI_DEVFN(slot->device,
526 func->function));
527 if (!dev) {
528 /* Do not set SLOT_ENABLED flag if some funcs
529 are not added. */
530 slot->flags &= (~SLOT_ENABLED);
531 continue;
537 * disable_slot - disable a slot
538 * @slot: ACPI PHP slot
540 static void disable_slot(struct acpiphp_slot *slot)
542 struct pci_bus *bus = slot->bus;
543 struct pci_dev *dev, *prev;
544 struct acpiphp_func *func;
547 * enable_slot() enumerates all functions in this device via
548 * pci_scan_slot(), whether they have associated ACPI hotplug
549 * methods (_EJ0, etc.) or not. Therefore, we remove all functions
550 * here.
552 list_for_each_entry_safe_reverse(dev, prev, &bus->devices, bus_list)
553 if (PCI_SLOT(dev->devfn) == slot->device)
554 pci_stop_and_remove_bus_device(dev);
556 list_for_each_entry(func, &slot->funcs, sibling)
557 acpi_bus_trim(func_to_acpi_device(func));
559 slot->flags &= (~SLOT_ENABLED);
562 static bool slot_no_hotplug(struct acpiphp_slot *slot)
564 struct pci_bus *bus = slot->bus;
565 struct pci_dev *dev;
567 list_for_each_entry(dev, &bus->devices, bus_list) {
568 if (PCI_SLOT(dev->devfn) == slot->device && dev->ignore_hotplug)
569 return true;
571 return false;
575 * get_slot_status - get ACPI slot status
576 * @slot: ACPI PHP slot
578 * If a slot has _STA for each function and if any one of them
579 * returned non-zero status, return it.
581 * If a slot doesn't have _STA and if any one of its functions'
582 * configuration space is configured, return 0x0f as a _STA.
584 * Otherwise return 0.
586 static unsigned int get_slot_status(struct acpiphp_slot *slot)
588 unsigned long long sta = 0;
589 struct acpiphp_func *func;
591 list_for_each_entry(func, &slot->funcs, sibling) {
592 if (func->flags & FUNC_HAS_STA) {
593 acpi_status status;
595 status = acpi_evaluate_integer(func_to_handle(func),
596 "_STA", NULL, &sta);
597 if (ACPI_SUCCESS(status) && sta)
598 break;
599 } else {
600 u32 dvid;
602 pci_bus_read_config_dword(slot->bus,
603 PCI_DEVFN(slot->device,
604 func->function),
605 PCI_VENDOR_ID, &dvid);
606 if (dvid != 0xffffffff) {
607 sta = ACPI_STA_ALL;
608 break;
613 return (unsigned int)sta;
616 static inline bool device_status_valid(unsigned int sta)
619 * ACPI spec says that _STA may return bit 0 clear with bit 3 set
620 * if the device is valid but does not require a device driver to be
621 * loaded (Section 6.3.7 of ACPI 5.0A).
623 unsigned int mask = ACPI_STA_DEVICE_ENABLED | ACPI_STA_DEVICE_FUNCTIONING;
624 return (sta & mask) == mask;
628 * trim_stale_devices - remove PCI devices that are not responding.
629 * @dev: PCI device to start walking the hierarchy from.
631 static void trim_stale_devices(struct pci_dev *dev)
633 struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
634 struct pci_bus *bus = dev->subordinate;
635 bool alive = dev->ignore_hotplug;
637 if (adev) {
638 acpi_status status;
639 unsigned long long sta;
641 status = acpi_evaluate_integer(adev->handle, "_STA", NULL, &sta);
642 alive = alive || (ACPI_SUCCESS(status) && device_status_valid(sta));
644 if (!alive)
645 alive = pci_device_is_present(dev);
647 if (!alive) {
648 pci_stop_and_remove_bus_device(dev);
649 if (adev)
650 acpi_bus_trim(adev);
651 } else if (bus) {
652 struct pci_dev *child, *tmp;
654 /* The device is a bridge. so check the bus below it. */
655 pm_runtime_get_sync(&dev->dev);
656 list_for_each_entry_safe_reverse(child, tmp, &bus->devices, bus_list)
657 trim_stale_devices(child);
659 pm_runtime_put(&dev->dev);
664 * acpiphp_check_bridge - re-enumerate devices
665 * @bridge: where to begin re-enumeration
667 * Iterate over all slots under this bridge and make sure that if a
668 * card is present they are enabled, and if not they are disabled.
670 static void acpiphp_check_bridge(struct acpiphp_bridge *bridge)
672 struct acpiphp_slot *slot;
674 /* Bail out if the bridge is going away. */
675 if (bridge->is_going_away)
676 return;
678 list_for_each_entry(slot, &bridge->slots, node) {
679 struct pci_bus *bus = slot->bus;
680 struct pci_dev *dev, *tmp;
682 if (slot_no_hotplug(slot)) {
683 ; /* do nothing */
684 } else if (device_status_valid(get_slot_status(slot))) {
685 /* remove stale devices if any */
686 list_for_each_entry_safe_reverse(dev, tmp,
687 &bus->devices, bus_list)
688 if (PCI_SLOT(dev->devfn) == slot->device)
689 trim_stale_devices(dev);
691 /* configure all functions */
692 enable_slot(slot);
693 } else {
694 disable_slot(slot);
700 * Remove devices for which we could not assign resources, call
701 * arch specific code to fix-up the bus
703 static void acpiphp_sanitize_bus(struct pci_bus *bus)
705 struct pci_dev *dev, *tmp;
706 int i;
707 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM;
709 list_for_each_entry_safe_reverse(dev, tmp, &bus->devices, bus_list) {
710 for (i = 0; i < PCI_BRIDGE_RESOURCES; i++) {
711 struct resource *res = &dev->resource[i];
712 if ((res->flags & type_mask) && !res->start &&
713 res->end) {
714 /* Could not assign a required resources
715 * for this device, remove it */
716 pci_stop_and_remove_bus_device(dev);
717 break;
724 * ACPI event handlers
727 void acpiphp_check_host_bridge(struct acpi_device *adev)
729 struct acpiphp_bridge *bridge = NULL;
731 acpi_lock_hp_context();
732 if (adev->hp) {
733 bridge = to_acpiphp_root_context(adev->hp)->root_bridge;
734 if (bridge)
735 get_bridge(bridge);
737 acpi_unlock_hp_context();
738 if (bridge) {
739 pci_lock_rescan_remove();
741 acpiphp_check_bridge(bridge);
743 pci_unlock_rescan_remove();
744 put_bridge(bridge);
748 static int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot);
750 static void hotplug_event(u32 type, struct acpiphp_context *context)
752 acpi_handle handle = context->hp.self->handle;
753 struct acpiphp_func *func = &context->func;
754 struct acpiphp_slot *slot = func->slot;
755 struct acpiphp_bridge *bridge;
757 acpi_lock_hp_context();
758 bridge = context->bridge;
759 if (bridge)
760 get_bridge(bridge);
762 acpi_unlock_hp_context();
764 pci_lock_rescan_remove();
766 switch (type) {
767 case ACPI_NOTIFY_BUS_CHECK:
768 /* bus re-enumerate */
769 acpi_handle_debug(handle, "Bus check in %s()\n", __func__);
770 if (bridge)
771 acpiphp_check_bridge(bridge);
772 else if (!(slot->flags & SLOT_IS_GOING_AWAY))
773 enable_slot(slot);
775 break;
777 case ACPI_NOTIFY_DEVICE_CHECK:
778 /* device check */
779 acpi_handle_debug(handle, "Device check in %s()\n", __func__);
780 if (bridge) {
781 acpiphp_check_bridge(bridge);
782 } else if (!(slot->flags & SLOT_IS_GOING_AWAY)) {
784 * Check if anything has changed in the slot and rescan
785 * from the parent if that's the case.
787 if (acpiphp_rescan_slot(slot))
788 acpiphp_check_bridge(func->parent);
790 break;
792 case ACPI_NOTIFY_EJECT_REQUEST:
793 /* request device eject */
794 acpi_handle_debug(handle, "Eject request in %s()\n", __func__);
795 acpiphp_disable_and_eject_slot(slot);
796 break;
799 pci_unlock_rescan_remove();
800 if (bridge)
801 put_bridge(bridge);
804 static int acpiphp_hotplug_notify(struct acpi_device *adev, u32 type)
806 struct acpiphp_context *context;
808 context = acpiphp_grab_context(adev);
809 if (!context)
810 return -ENODATA;
812 hotplug_event(type, context);
813 acpiphp_let_context_go(context);
814 return 0;
818 * acpiphp_enumerate_slots - Enumerate PCI slots for a given bus.
819 * @bus: PCI bus to enumerate the slots for.
821 * A "slot" is an object associated with a PCI device number. All functions
822 * (PCI devices) with the same bus and device number belong to the same slot.
824 void acpiphp_enumerate_slots(struct pci_bus *bus)
826 struct acpiphp_bridge *bridge;
827 struct acpi_device *adev;
828 acpi_handle handle;
829 acpi_status status;
831 if (acpiphp_disabled)
832 return;
834 adev = ACPI_COMPANION(bus->bridge);
835 if (!adev)
836 return;
838 handle = adev->handle;
839 bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
840 if (!bridge) {
841 acpi_handle_err(handle, "No memory for bridge object\n");
842 return;
845 INIT_LIST_HEAD(&bridge->slots);
846 kref_init(&bridge->ref);
847 bridge->pci_dev = pci_dev_get(bus->self);
848 bridge->pci_bus = bus;
851 * Grab a ref to the subordinate PCI bus in case the bus is
852 * removed via PCI core logical hotplug. The ref pins the bus
853 * (which we access during module unload).
855 get_device(&bus->dev);
857 acpi_lock_hp_context();
858 if (pci_is_root_bus(bridge->pci_bus)) {
859 struct acpiphp_root_context *root_context;
861 root_context = kzalloc(sizeof(*root_context), GFP_KERNEL);
862 if (!root_context)
863 goto err;
865 root_context->root_bridge = bridge;
866 acpi_set_hp_context(adev, &root_context->hp);
867 } else {
868 struct acpiphp_context *context;
871 * This bridge should have been registered as a hotplug function
872 * under its parent, so the context should be there, unless the
873 * parent is going to be handled by pciehp, in which case this
874 * bridge is not interesting to us either.
876 context = acpiphp_get_context(adev);
877 if (!context)
878 goto err;
880 bridge->context = context;
881 context->bridge = bridge;
882 /* Get a reference to the parent bridge. */
883 get_bridge(context->func.parent);
885 acpi_unlock_hp_context();
887 /* Must be added to the list prior to calling acpiphp_add_context(). */
888 mutex_lock(&bridge_mutex);
889 list_add(&bridge->list, &bridge_list);
890 mutex_unlock(&bridge_mutex);
892 /* register all slot objects under this bridge */
893 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1,
894 acpiphp_add_context, NULL, bridge, NULL);
895 if (ACPI_FAILURE(status)) {
896 acpi_handle_err(handle, "failed to register slots\n");
897 cleanup_bridge(bridge);
898 put_bridge(bridge);
900 return;
902 err:
903 acpi_unlock_hp_context();
904 put_device(&bus->dev);
905 pci_dev_put(bridge->pci_dev);
906 kfree(bridge);
909 static void acpiphp_drop_bridge(struct acpiphp_bridge *bridge)
911 if (pci_is_root_bus(bridge->pci_bus)) {
912 struct acpiphp_root_context *root_context;
913 struct acpi_device *adev;
915 acpi_lock_hp_context();
916 adev = ACPI_COMPANION(bridge->pci_bus->bridge);
917 root_context = to_acpiphp_root_context(adev->hp);
918 adev->hp = NULL;
919 acpi_unlock_hp_context();
920 kfree(root_context);
922 cleanup_bridge(bridge);
923 put_bridge(bridge);
927 * acpiphp_remove_slots - Remove slot objects associated with a given bus.
928 * @bus: PCI bus to remove the slot objects for.
930 void acpiphp_remove_slots(struct pci_bus *bus)
932 struct acpiphp_bridge *bridge;
934 if (acpiphp_disabled)
935 return;
937 mutex_lock(&bridge_mutex);
938 list_for_each_entry(bridge, &bridge_list, list)
939 if (bridge->pci_bus == bus) {
940 mutex_unlock(&bridge_mutex);
941 acpiphp_drop_bridge(bridge);
942 return;
945 mutex_unlock(&bridge_mutex);
949 * acpiphp_enable_slot - power on slot
950 * @slot: ACPI PHP slot
952 int acpiphp_enable_slot(struct acpiphp_slot *slot)
954 pci_lock_rescan_remove();
956 if (slot->flags & SLOT_IS_GOING_AWAY) {
957 pci_unlock_rescan_remove();
958 return -ENODEV;
961 /* configure all functions */
962 if (!(slot->flags & SLOT_ENABLED))
963 enable_slot(slot);
965 pci_unlock_rescan_remove();
966 return 0;
970 * acpiphp_disable_and_eject_slot - power off and eject slot
971 * @slot: ACPI PHP slot
973 static int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot)
975 struct acpiphp_func *func;
977 if (slot->flags & SLOT_IS_GOING_AWAY)
978 return -ENODEV;
980 /* unconfigure all functions */
981 disable_slot(slot);
983 list_for_each_entry(func, &slot->funcs, sibling)
984 if (func->flags & FUNC_HAS_EJ0) {
985 acpi_handle handle = func_to_handle(func);
987 if (ACPI_FAILURE(acpi_evaluate_ej0(handle)))
988 acpi_handle_err(handle, "_EJ0 failed\n");
990 break;
993 return 0;
996 int acpiphp_disable_slot(struct acpiphp_slot *slot)
998 int ret;
1001 * Acquire acpi_scan_lock to ensure that the execution of _EJ0 in
1002 * acpiphp_disable_and_eject_slot() will be synchronized properly.
1004 acpi_scan_lock_acquire();
1005 pci_lock_rescan_remove();
1006 ret = acpiphp_disable_and_eject_slot(slot);
1007 pci_unlock_rescan_remove();
1008 acpi_scan_lock_release();
1009 return ret;
1013 * slot enabled: 1
1014 * slot disabled: 0
1016 u8 acpiphp_get_power_status(struct acpiphp_slot *slot)
1018 return (slot->flags & SLOT_ENABLED);
1022 * latch open: 1
1023 * latch closed: 0
1025 u8 acpiphp_get_latch_status(struct acpiphp_slot *slot)
1027 return !(get_slot_status(slot) & ACPI_STA_DEVICE_UI);
1031 * adapter presence : 1
1032 * absence : 0
1034 u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot)
1036 return !!get_slot_status(slot);