Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
[linux/fpc-iii.git] / drivers / pci / hotplug / acpiphp_glue.c
blobe2a783fdb98fdc6be6cb24f52a9a828ba48f2ba6
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/init.h>
45 #include <linux/module.h>
47 #include <linux/kernel.h>
48 #include <linux/pci.h>
49 #include <linux/pci_hotplug.h>
50 #include <linux/pci-acpi.h>
51 #include <linux/pm_runtime.h>
52 #include <linux/mutex.h>
53 #include <linux/slab.h>
54 #include <linux/acpi.h>
56 #include "../pci.h"
57 #include "acpiphp.h"
59 static LIST_HEAD(bridge_list);
60 static DEFINE_MUTEX(bridge_mutex);
61 static DEFINE_MUTEX(acpiphp_context_lock);
63 static void handle_hotplug_event(acpi_handle handle, u32 type, void *data);
64 static void acpiphp_sanitize_bus(struct pci_bus *bus);
65 static void acpiphp_set_hpp_values(struct pci_bus *bus);
66 static void hotplug_event(acpi_handle handle, u32 type, void *data);
67 static void free_bridge(struct kref *kref);
69 static void acpiphp_context_handler(acpi_handle handle, void *context)
71 /* Intentionally empty. */
74 /**
75 * acpiphp_init_context - Create hotplug context and grab a reference to it.
76 * @handle: ACPI object handle to create the context for.
78 * Call under acpiphp_context_lock.
80 static struct acpiphp_context *acpiphp_init_context(acpi_handle handle)
82 struct acpiphp_context *context;
83 acpi_status status;
85 context = kzalloc(sizeof(*context), GFP_KERNEL);
86 if (!context)
87 return NULL;
89 context->handle = handle;
90 context->refcount = 1;
91 status = acpi_attach_data(handle, acpiphp_context_handler, context);
92 if (ACPI_FAILURE(status)) {
93 kfree(context);
94 return NULL;
96 return context;
99 /**
100 * acpiphp_get_context - Get hotplug context and grab a reference to it.
101 * @handle: ACPI object handle to get the context for.
103 * Call under acpiphp_context_lock.
105 static struct acpiphp_context *acpiphp_get_context(acpi_handle handle)
107 struct acpiphp_context *context = NULL;
108 acpi_status status;
109 void *data;
111 status = acpi_get_data(handle, acpiphp_context_handler, &data);
112 if (ACPI_SUCCESS(status)) {
113 context = data;
114 context->refcount++;
116 return context;
120 * acpiphp_put_context - Drop a reference to ACPI hotplug context.
121 * @handle: ACPI object handle to put the context for.
123 * The context object is removed if there are no more references to it.
125 * Call under acpiphp_context_lock.
127 static void acpiphp_put_context(struct acpiphp_context *context)
129 if (--context->refcount)
130 return;
132 WARN_ON(context->bridge);
133 acpi_detach_data(context->handle, acpiphp_context_handler);
134 kfree(context);
137 static inline void get_bridge(struct acpiphp_bridge *bridge)
139 kref_get(&bridge->ref);
142 static inline void put_bridge(struct acpiphp_bridge *bridge)
144 kref_put(&bridge->ref, free_bridge);
147 static void free_bridge(struct kref *kref)
149 struct acpiphp_context *context;
150 struct acpiphp_bridge *bridge;
151 struct acpiphp_slot *slot, *next;
152 struct acpiphp_func *func, *tmp;
154 mutex_lock(&acpiphp_context_lock);
156 bridge = container_of(kref, struct acpiphp_bridge, ref);
158 list_for_each_entry_safe(slot, next, &bridge->slots, node) {
159 list_for_each_entry_safe(func, tmp, &slot->funcs, sibling)
160 acpiphp_put_context(func_to_context(func));
162 kfree(slot);
165 context = bridge->context;
166 /* Root bridges will not have hotplug context. */
167 if (context) {
168 /* Release the reference taken by acpiphp_enumerate_slots(). */
169 put_bridge(context->func.parent);
170 context->bridge = NULL;
171 acpiphp_put_context(context);
174 put_device(&bridge->pci_bus->dev);
175 pci_dev_put(bridge->pci_dev);
176 kfree(bridge);
178 mutex_unlock(&acpiphp_context_lock);
182 * the _DCK method can do funny things... and sometimes not
183 * hah-hah funny.
185 * TBD - figure out a way to only call fixups for
186 * systems that require them.
188 static void post_dock_fixups(acpi_handle not_used, u32 event, void *data)
190 struct acpiphp_context *context = data;
191 struct pci_bus *bus = context->func.slot->bus;
192 u32 buses;
194 if (!bus->self)
195 return;
197 /* fixup bad _DCK function that rewrites
198 * secondary bridge on slot
200 pci_read_config_dword(bus->self,
201 PCI_PRIMARY_BUS,
202 &buses);
204 if (((buses >> 8) & 0xff) != bus->busn_res.start) {
205 buses = (buses & 0xff000000)
206 | ((unsigned int)(bus->primary) << 0)
207 | ((unsigned int)(bus->busn_res.start) << 8)
208 | ((unsigned int)(bus->busn_res.end) << 16);
209 pci_write_config_dword(bus->self, PCI_PRIMARY_BUS, buses);
213 static void dock_event(acpi_handle handle, u32 type, void *data)
215 struct acpiphp_context *context;
217 mutex_lock(&acpiphp_context_lock);
218 context = acpiphp_get_context(handle);
219 if (!context || WARN_ON(context->handle != handle)
220 || context->func.parent->is_going_away) {
221 mutex_unlock(&acpiphp_context_lock);
222 return;
224 get_bridge(context->func.parent);
225 acpiphp_put_context(context);
226 mutex_unlock(&acpiphp_context_lock);
228 hotplug_event(handle, type, data);
230 put_bridge(context->func.parent);
233 static const struct acpi_dock_ops acpiphp_dock_ops = {
234 .fixup = post_dock_fixups,
235 .handler = dock_event,
238 /* Check whether the PCI device is managed by native PCIe hotplug driver */
239 static bool device_is_managed_by_native_pciehp(struct pci_dev *pdev)
241 u32 reg32;
242 acpi_handle tmp;
243 struct acpi_pci_root *root;
245 /* Check whether the PCIe port supports native PCIe hotplug */
246 if (pcie_capability_read_dword(pdev, PCI_EXP_SLTCAP, &reg32))
247 return false;
248 if (!(reg32 & PCI_EXP_SLTCAP_HPC))
249 return false;
252 * Check whether native PCIe hotplug has been enabled for
253 * this PCIe hierarchy.
255 tmp = acpi_find_root_bridge_handle(pdev);
256 if (!tmp)
257 return false;
258 root = acpi_pci_find_root(tmp);
259 if (!root)
260 return false;
261 if (!(root->osc_control_set & OSC_PCI_EXPRESS_NATIVE_HP_CONTROL))
262 return false;
264 return true;
267 static void acpiphp_dock_init(void *data)
269 struct acpiphp_context *context = data;
271 get_bridge(context->func.parent);
274 static void acpiphp_dock_release(void *data)
276 struct acpiphp_context *context = data;
278 put_bridge(context->func.parent);
281 /* callback routine to register each ACPI PCI slot object */
282 static acpi_status register_slot(acpi_handle handle, u32 lvl, void *data,
283 void **rv)
285 struct acpiphp_bridge *bridge = data;
286 struct acpiphp_context *context;
287 struct acpiphp_slot *slot;
288 struct acpiphp_func *newfunc;
289 acpi_status status = AE_OK;
290 unsigned long long adr;
291 int device, function;
292 struct pci_bus *pbus = bridge->pci_bus;
293 struct pci_dev *pdev = bridge->pci_dev;
294 u32 val;
296 if (pdev && device_is_managed_by_native_pciehp(pdev))
297 return AE_OK;
299 status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr);
300 if (ACPI_FAILURE(status)) {
301 if (status != AE_NOT_FOUND)
302 acpi_handle_warn(handle,
303 "can't evaluate _ADR (%#x)\n", status);
304 return AE_OK;
307 device = (adr >> 16) & 0xffff;
308 function = adr & 0xffff;
310 mutex_lock(&acpiphp_context_lock);
311 context = acpiphp_init_context(handle);
312 if (!context) {
313 mutex_unlock(&acpiphp_context_lock);
314 acpi_handle_err(handle, "No hotplug context\n");
315 return AE_NOT_EXIST;
317 newfunc = &context->func;
318 newfunc->function = function;
319 newfunc->parent = bridge;
320 mutex_unlock(&acpiphp_context_lock);
322 if (acpi_has_method(handle, "_EJ0"))
323 newfunc->flags = FUNC_HAS_EJ0;
325 if (acpi_has_method(handle, "_STA"))
326 newfunc->flags |= FUNC_HAS_STA;
328 if (acpi_has_method(handle, "_DCK"))
329 newfunc->flags |= FUNC_HAS_DCK;
331 /* search for objects that share the same slot */
332 list_for_each_entry(slot, &bridge->slots, node)
333 if (slot->device == device)
334 goto slot_found;
336 slot = kzalloc(sizeof(struct acpiphp_slot), GFP_KERNEL);
337 if (!slot) {
338 status = AE_NO_MEMORY;
339 goto err;
342 slot->bus = bridge->pci_bus;
343 slot->device = device;
344 INIT_LIST_HEAD(&slot->funcs);
345 mutex_init(&slot->crit_sect);
347 list_add_tail(&slot->node, &bridge->slots);
349 /* Register slots for ejectable functions only. */
350 if (acpi_pci_check_ejectable(pbus, handle) || is_dock_device(handle)) {
351 unsigned long long sun;
352 int retval;
354 bridge->nr_slots++;
355 status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun);
356 if (ACPI_FAILURE(status))
357 sun = bridge->nr_slots;
359 pr_debug("found ACPI PCI Hotplug slot %llu at PCI %04x:%02x:%02x\n",
360 sun, pci_domain_nr(pbus), pbus->number, device);
362 retval = acpiphp_register_hotplug_slot(slot, sun);
363 if (retval) {
364 slot->slot = NULL;
365 bridge->nr_slots--;
366 if (retval == -EBUSY)
367 pr_warn("Slot %llu already registered by another "
368 "hotplug driver\n", sun);
369 else
370 pr_warn("acpiphp_register_hotplug_slot failed "
371 "(err code = 0x%x)\n", retval);
373 /* Even if the slot registration fails, we can still use it. */
376 slot_found:
377 newfunc->slot = slot;
378 list_add_tail(&newfunc->sibling, &slot->funcs);
380 if (pci_bus_read_dev_vendor_id(pbus, PCI_DEVFN(device, function),
381 &val, 60*1000))
382 slot->flags |= SLOT_ENABLED;
384 if (is_dock_device(handle)) {
385 /* we don't want to call this device's _EJ0
386 * because we want the dock notify handler
387 * to call it after it calls _DCK
389 newfunc->flags &= ~FUNC_HAS_EJ0;
390 if (register_hotplug_dock_device(handle,
391 &acpiphp_dock_ops, context,
392 acpiphp_dock_init, acpiphp_dock_release))
393 pr_debug("failed to register dock device\n");
396 /* install notify handler */
397 if (!(newfunc->flags & FUNC_HAS_DCK)) {
398 status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
399 handle_hotplug_event,
400 context);
401 if (ACPI_FAILURE(status))
402 acpi_handle_err(handle,
403 "failed to install notify handler\n");
406 return AE_OK;
408 err:
409 mutex_lock(&acpiphp_context_lock);
410 acpiphp_put_context(context);
411 mutex_unlock(&acpiphp_context_lock);
412 return status;
415 static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle)
417 struct acpiphp_context *context;
418 struct acpiphp_bridge *bridge = NULL;
420 mutex_lock(&acpiphp_context_lock);
421 context = acpiphp_get_context(handle);
422 if (context) {
423 bridge = context->bridge;
424 if (bridge)
425 get_bridge(bridge);
427 acpiphp_put_context(context);
429 mutex_unlock(&acpiphp_context_lock);
430 return bridge;
433 static void cleanup_bridge(struct acpiphp_bridge *bridge)
435 struct acpiphp_slot *slot;
436 struct acpiphp_func *func;
437 acpi_status status;
439 list_for_each_entry(slot, &bridge->slots, node) {
440 list_for_each_entry(func, &slot->funcs, sibling) {
441 acpi_handle handle = func_to_handle(func);
443 if (is_dock_device(handle))
444 unregister_hotplug_dock_device(handle);
446 if (!(func->flags & FUNC_HAS_DCK)) {
447 status = acpi_remove_notify_handler(handle,
448 ACPI_SYSTEM_NOTIFY,
449 handle_hotplug_event);
450 if (ACPI_FAILURE(status))
451 pr_err("failed to remove notify handler\n");
454 slot->flags |= SLOT_IS_GOING_AWAY;
455 if (slot->slot)
456 acpiphp_unregister_hotplug_slot(slot);
459 mutex_lock(&bridge_mutex);
460 list_del(&bridge->list);
461 mutex_unlock(&bridge_mutex);
463 mutex_lock(&acpiphp_context_lock);
464 bridge->is_going_away = true;
465 mutex_unlock(&acpiphp_context_lock);
469 * acpiphp_max_busnr - return the highest reserved bus number under the given bus.
470 * @bus: bus to start search with
472 static unsigned char acpiphp_max_busnr(struct pci_bus *bus)
474 struct list_head *tmp;
475 unsigned char max, n;
478 * pci_bus_max_busnr will return the highest
479 * reserved busnr for all these children.
480 * that is equivalent to the bus->subordinate
481 * value. We don't want to use the parent's
482 * bus->subordinate value because it could have
483 * padding in it.
485 max = bus->busn_res.start;
487 list_for_each(tmp, &bus->children) {
488 n = pci_bus_max_busnr(pci_bus_b(tmp));
489 if (n > max)
490 max = n;
492 return max;
496 * acpiphp_bus_trim - Trim device objects in an ACPI namespace subtree.
497 * @handle: ACPI device object handle to start from.
499 static void acpiphp_bus_trim(acpi_handle handle)
501 struct acpi_device *adev = NULL;
503 acpi_bus_get_device(handle, &adev);
504 if (adev)
505 acpi_bus_trim(adev);
509 * acpiphp_bus_add - Scan ACPI namespace subtree.
510 * @handle: ACPI object handle to start the scan from.
512 static void acpiphp_bus_add(acpi_handle handle)
514 struct acpi_device *adev = NULL;
516 acpi_bus_scan(handle);
517 acpi_bus_get_device(handle, &adev);
518 if (acpi_device_enumerated(adev))
519 acpi_device_set_power(adev, ACPI_STATE_D0);
522 static void acpiphp_set_acpi_region(struct acpiphp_slot *slot)
524 struct acpiphp_func *func;
525 union acpi_object params[2];
526 struct acpi_object_list arg_list;
528 list_for_each_entry(func, &slot->funcs, sibling) {
529 arg_list.count = 2;
530 arg_list.pointer = params;
531 params[0].type = ACPI_TYPE_INTEGER;
532 params[0].integer.value = ACPI_ADR_SPACE_PCI_CONFIG;
533 params[1].type = ACPI_TYPE_INTEGER;
534 params[1].integer.value = 1;
535 /* _REG is optional, we don't care about if there is failure */
536 acpi_evaluate_object(func_to_handle(func), "_REG", &arg_list,
537 NULL);
541 static void check_hotplug_bridge(struct acpiphp_slot *slot, struct pci_dev *dev)
543 struct acpiphp_func *func;
545 /* quirk, or pcie could set it already */
546 if (dev->is_hotplug_bridge)
547 return;
549 list_for_each_entry(func, &slot->funcs, sibling) {
550 if (PCI_FUNC(dev->devfn) == func->function) {
551 dev->is_hotplug_bridge = 1;
552 break;
557 static int acpiphp_rescan_slot(struct acpiphp_slot *slot)
559 struct acpiphp_func *func;
561 list_for_each_entry(func, &slot->funcs, sibling)
562 acpiphp_bus_add(func_to_handle(func));
564 return pci_scan_slot(slot->bus, PCI_DEVFN(slot->device, 0));
568 * enable_slot - enable, configure a slot
569 * @slot: slot to be enabled
571 * This function should be called per *physical slot*,
572 * not per each slot object in ACPI namespace.
574 static void __ref enable_slot(struct acpiphp_slot *slot)
576 struct pci_dev *dev;
577 struct pci_bus *bus = slot->bus;
578 struct acpiphp_func *func;
579 int max, pass;
580 LIST_HEAD(add_list);
582 acpiphp_rescan_slot(slot);
583 max = acpiphp_max_busnr(bus);
584 for (pass = 0; pass < 2; pass++) {
585 list_for_each_entry(dev, &bus->devices, bus_list) {
586 if (PCI_SLOT(dev->devfn) != slot->device)
587 continue;
589 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
590 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
591 max = pci_scan_bridge(bus, dev, max, pass);
592 if (pass && dev->subordinate) {
593 check_hotplug_bridge(slot, dev);
594 pcibios_resource_survey_bus(dev->subordinate);
595 __pci_bus_size_bridges(dev->subordinate,
596 &add_list);
601 __pci_bus_assign_resources(bus, &add_list, NULL);
603 acpiphp_sanitize_bus(bus);
604 acpiphp_set_hpp_values(bus);
605 acpiphp_set_acpi_region(slot);
607 list_for_each_entry(dev, &bus->devices, bus_list) {
608 /* Assume that newly added devices are powered on already. */
609 if (!dev->is_added)
610 dev->current_state = PCI_D0;
613 pci_bus_add_devices(bus);
615 slot->flags |= SLOT_ENABLED;
616 list_for_each_entry(func, &slot->funcs, sibling) {
617 dev = pci_get_slot(bus, PCI_DEVFN(slot->device,
618 func->function));
619 if (!dev) {
620 /* Do not set SLOT_ENABLED flag if some funcs
621 are not added. */
622 slot->flags &= (~SLOT_ENABLED);
623 continue;
628 /* return first device in slot, acquiring a reference on it */
629 static struct pci_dev *dev_in_slot(struct acpiphp_slot *slot)
631 struct pci_bus *bus = slot->bus;
632 struct pci_dev *dev;
633 struct pci_dev *ret = NULL;
635 down_read(&pci_bus_sem);
636 list_for_each_entry(dev, &bus->devices, bus_list)
637 if (PCI_SLOT(dev->devfn) == slot->device) {
638 ret = pci_dev_get(dev);
639 break;
641 up_read(&pci_bus_sem);
643 return ret;
647 * disable_slot - disable a slot
648 * @slot: ACPI PHP slot
650 static void disable_slot(struct acpiphp_slot *slot)
652 struct acpiphp_func *func;
653 struct pci_dev *pdev;
656 * enable_slot() enumerates all functions in this device via
657 * pci_scan_slot(), whether they have associated ACPI hotplug
658 * methods (_EJ0, etc.) or not. Therefore, we remove all functions
659 * here.
661 while ((pdev = dev_in_slot(slot))) {
662 pci_stop_and_remove_bus_device(pdev);
663 pci_dev_put(pdev);
666 list_for_each_entry(func, &slot->funcs, sibling)
667 acpiphp_bus_trim(func_to_handle(func));
669 slot->flags &= (~SLOT_ENABLED);
672 static bool acpiphp_no_hotplug(acpi_handle handle)
674 struct acpi_device *adev = NULL;
676 acpi_bus_get_device(handle, &adev);
677 return adev && adev->flags.no_hotplug;
680 static bool slot_no_hotplug(struct acpiphp_slot *slot)
682 struct acpiphp_func *func;
684 list_for_each_entry(func, &slot->funcs, sibling)
685 if (acpiphp_no_hotplug(func_to_handle(func)))
686 return true;
688 return false;
692 * get_slot_status - get ACPI slot status
693 * @slot: ACPI PHP slot
695 * If a slot has _STA for each function and if any one of them
696 * returned non-zero status, return it.
698 * If a slot doesn't have _STA and if any one of its functions'
699 * configuration space is configured, return 0x0f as a _STA.
701 * Otherwise return 0.
703 static unsigned int get_slot_status(struct acpiphp_slot *slot)
705 unsigned long long sta = 0;
706 struct acpiphp_func *func;
708 list_for_each_entry(func, &slot->funcs, sibling) {
709 if (func->flags & FUNC_HAS_STA) {
710 acpi_status status;
712 status = acpi_evaluate_integer(func_to_handle(func),
713 "_STA", NULL, &sta);
714 if (ACPI_SUCCESS(status) && sta)
715 break;
716 } else {
717 u32 dvid;
719 pci_bus_read_config_dword(slot->bus,
720 PCI_DEVFN(slot->device,
721 func->function),
722 PCI_VENDOR_ID, &dvid);
723 if (dvid != 0xffffffff) {
724 sta = ACPI_STA_ALL;
725 break;
730 return (unsigned int)sta;
734 * trim_stale_devices - remove PCI devices that are not responding.
735 * @dev: PCI device to start walking the hierarchy from.
737 static void trim_stale_devices(struct pci_dev *dev)
739 acpi_handle handle = ACPI_HANDLE(&dev->dev);
740 struct pci_bus *bus = dev->subordinate;
741 bool alive = false;
743 if (handle) {
744 acpi_status status;
745 unsigned long long sta;
747 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
748 alive = (ACPI_SUCCESS(status) && sta == ACPI_STA_ALL)
749 || acpiphp_no_hotplug(handle);
751 if (!alive) {
752 u32 v;
754 /* Check if the device responds. */
755 alive = pci_bus_read_dev_vendor_id(dev->bus, dev->devfn, &v, 0);
757 if (!alive) {
758 pci_stop_and_remove_bus_device(dev);
759 if (handle)
760 acpiphp_bus_trim(handle);
761 } else if (bus) {
762 struct pci_dev *child, *tmp;
764 /* The device is a bridge. so check the bus below it. */
765 pm_runtime_get_sync(&dev->dev);
766 list_for_each_entry_safe_reverse(child, tmp, &bus->devices, bus_list)
767 trim_stale_devices(child);
769 pm_runtime_put(&dev->dev);
774 * acpiphp_check_bridge - re-enumerate devices
775 * @bridge: where to begin re-enumeration
777 * Iterate over all slots under this bridge and make sure that if a
778 * card is present they are enabled, and if not they are disabled.
780 static void acpiphp_check_bridge(struct acpiphp_bridge *bridge)
782 struct acpiphp_slot *slot;
784 /* Bail out if the bridge is going away. */
785 if (bridge->is_going_away)
786 return;
788 list_for_each_entry(slot, &bridge->slots, node) {
789 struct pci_bus *bus = slot->bus;
790 struct pci_dev *dev, *tmp;
792 mutex_lock(&slot->crit_sect);
793 if (slot_no_hotplug(slot)) {
794 ; /* do nothing */
795 } else if (get_slot_status(slot) == ACPI_STA_ALL) {
796 /* remove stale devices if any */
797 list_for_each_entry_safe_reverse(dev, tmp,
798 &bus->devices, bus_list)
799 if (PCI_SLOT(dev->devfn) == slot->device)
800 trim_stale_devices(dev);
802 /* configure all functions */
803 enable_slot(slot);
804 } else {
805 disable_slot(slot);
807 mutex_unlock(&slot->crit_sect);
811 static void acpiphp_set_hpp_values(struct pci_bus *bus)
813 struct pci_dev *dev;
815 list_for_each_entry(dev, &bus->devices, bus_list)
816 pci_configure_slot(dev);
820 * Remove devices for which we could not assign resources, call
821 * arch specific code to fix-up the bus
823 static void acpiphp_sanitize_bus(struct pci_bus *bus)
825 struct pci_dev *dev, *tmp;
826 int i;
827 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM;
829 list_for_each_entry_safe_reverse(dev, tmp, &bus->devices, bus_list) {
830 for (i=0; i<PCI_BRIDGE_RESOURCES; i++) {
831 struct resource *res = &dev->resource[i];
832 if ((res->flags & type_mask) && !res->start &&
833 res->end) {
834 /* Could not assign a required resources
835 * for this device, remove it */
836 pci_stop_and_remove_bus_device(dev);
837 break;
844 * ACPI event handlers
847 void acpiphp_check_host_bridge(acpi_handle handle)
849 struct acpiphp_bridge *bridge;
851 bridge = acpiphp_handle_to_bridge(handle);
852 if (bridge) {
853 pci_lock_rescan_remove();
855 acpiphp_check_bridge(bridge);
857 pci_unlock_rescan_remove();
858 put_bridge(bridge);
862 static int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot);
864 static void hotplug_event(acpi_handle handle, u32 type, void *data)
866 struct acpiphp_context *context = data;
867 struct acpiphp_func *func = &context->func;
868 struct acpiphp_bridge *bridge;
869 char objname[64];
870 struct acpi_buffer buffer = { .length = sizeof(objname),
871 .pointer = objname };
873 mutex_lock(&acpiphp_context_lock);
874 bridge = context->bridge;
875 if (bridge)
876 get_bridge(bridge);
878 mutex_unlock(&acpiphp_context_lock);
880 pci_lock_rescan_remove();
881 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
883 switch (type) {
884 case ACPI_NOTIFY_BUS_CHECK:
885 /* bus re-enumerate */
886 pr_debug("%s: Bus check notify on %s\n", __func__, objname);
887 pr_debug("%s: re-enumerating slots under %s\n",
888 __func__, objname);
889 if (bridge) {
890 acpiphp_check_bridge(bridge);
891 } else {
892 struct acpiphp_slot *slot = func->slot;
894 if (slot->flags & SLOT_IS_GOING_AWAY)
895 break;
897 mutex_lock(&slot->crit_sect);
898 enable_slot(slot);
899 mutex_unlock(&slot->crit_sect);
901 break;
903 case ACPI_NOTIFY_DEVICE_CHECK:
904 /* device check */
905 pr_debug("%s: Device check notify on %s\n", __func__, objname);
906 if (bridge) {
907 acpiphp_check_bridge(bridge);
908 } else {
909 struct acpiphp_slot *slot = func->slot;
910 int ret;
912 if (slot->flags & SLOT_IS_GOING_AWAY)
913 break;
916 * Check if anything has changed in the slot and rescan
917 * from the parent if that's the case.
919 mutex_lock(&slot->crit_sect);
920 ret = acpiphp_rescan_slot(slot);
921 mutex_unlock(&slot->crit_sect);
922 if (ret)
923 acpiphp_check_bridge(func->parent);
925 break;
927 case ACPI_NOTIFY_EJECT_REQUEST:
928 /* request device eject */
929 pr_debug("%s: Device eject notify on %s\n", __func__, objname);
930 acpiphp_disable_and_eject_slot(func->slot);
931 break;
934 pci_unlock_rescan_remove();
935 if (bridge)
936 put_bridge(bridge);
939 static void hotplug_event_work(void *data, u32 type)
941 struct acpiphp_context *context = data;
942 acpi_handle handle = context->handle;
944 acpi_scan_lock_acquire();
946 hotplug_event(handle, type, context);
948 acpi_scan_lock_release();
949 acpi_evaluate_hotplug_ost(handle, type, ACPI_OST_SC_SUCCESS, NULL);
950 put_bridge(context->func.parent);
954 * handle_hotplug_event - handle ACPI hotplug event
955 * @handle: Notify()'ed acpi_handle
956 * @type: Notify code
957 * @data: pointer to acpiphp_context structure
959 * Handles ACPI event notification on slots.
961 static void handle_hotplug_event(acpi_handle handle, u32 type, void *data)
963 struct acpiphp_context *context;
964 u32 ost_code = ACPI_OST_SC_SUCCESS;
965 acpi_status status;
967 switch (type) {
968 case ACPI_NOTIFY_BUS_CHECK:
969 case ACPI_NOTIFY_DEVICE_CHECK:
970 break;
971 case ACPI_NOTIFY_EJECT_REQUEST:
972 ost_code = ACPI_OST_SC_EJECT_IN_PROGRESS;
973 acpi_evaluate_hotplug_ost(handle, type, ost_code, NULL);
974 break;
976 case ACPI_NOTIFY_DEVICE_WAKE:
977 return;
979 case ACPI_NOTIFY_FREQUENCY_MISMATCH:
980 acpi_handle_err(handle, "Device cannot be configured due "
981 "to a frequency mismatch\n");
982 goto out;
984 case ACPI_NOTIFY_BUS_MODE_MISMATCH:
985 acpi_handle_err(handle, "Device cannot be configured due "
986 "to a bus mode mismatch\n");
987 goto out;
989 case ACPI_NOTIFY_POWER_FAULT:
990 acpi_handle_err(handle, "Device has suffered a power fault\n");
991 goto out;
993 default:
994 acpi_handle_warn(handle, "Unsupported event type 0x%x\n", type);
995 ost_code = ACPI_OST_SC_UNRECOGNIZED_NOTIFY;
996 goto out;
999 mutex_lock(&acpiphp_context_lock);
1000 context = acpiphp_get_context(handle);
1001 if (!context || WARN_ON(context->handle != handle)
1002 || context->func.parent->is_going_away)
1003 goto err_out;
1005 get_bridge(context->func.parent);
1006 acpiphp_put_context(context);
1007 status = acpi_hotplug_execute(hotplug_event_work, context, type);
1008 if (ACPI_SUCCESS(status)) {
1009 mutex_unlock(&acpiphp_context_lock);
1010 return;
1012 put_bridge(context->func.parent);
1014 err_out:
1015 mutex_unlock(&acpiphp_context_lock);
1016 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
1018 out:
1019 acpi_evaluate_hotplug_ost(handle, type, ost_code, NULL);
1023 * Create hotplug slots for the PCI bus.
1024 * It should always return 0 to avoid skipping following notifiers.
1026 void acpiphp_enumerate_slots(struct pci_bus *bus)
1028 struct acpiphp_bridge *bridge;
1029 acpi_handle handle;
1030 acpi_status status;
1032 if (acpiphp_disabled)
1033 return;
1035 handle = ACPI_HANDLE(bus->bridge);
1036 if (!handle)
1037 return;
1039 bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
1040 if (!bridge) {
1041 acpi_handle_err(handle, "No memory for bridge object\n");
1042 return;
1045 INIT_LIST_HEAD(&bridge->slots);
1046 kref_init(&bridge->ref);
1047 bridge->pci_dev = pci_dev_get(bus->self);
1048 bridge->pci_bus = bus;
1051 * Grab a ref to the subordinate PCI bus in case the bus is
1052 * removed via PCI core logical hotplug. The ref pins the bus
1053 * (which we access during module unload).
1055 get_device(&bus->dev);
1057 if (!pci_is_root_bus(bridge->pci_bus)) {
1058 struct acpiphp_context *context;
1061 * This bridge should have been registered as a hotplug function
1062 * under its parent, so the context should be there, unless the
1063 * parent is going to be handled by pciehp, in which case this
1064 * bridge is not interesting to us either.
1066 mutex_lock(&acpiphp_context_lock);
1067 context = acpiphp_get_context(handle);
1068 if (!context) {
1069 mutex_unlock(&acpiphp_context_lock);
1070 put_device(&bus->dev);
1071 pci_dev_put(bridge->pci_dev);
1072 kfree(bridge);
1073 return;
1075 bridge->context = context;
1076 context->bridge = bridge;
1077 /* Get a reference to the parent bridge. */
1078 get_bridge(context->func.parent);
1079 mutex_unlock(&acpiphp_context_lock);
1082 /* must be added to the list prior to calling register_slot */
1083 mutex_lock(&bridge_mutex);
1084 list_add(&bridge->list, &bridge_list);
1085 mutex_unlock(&bridge_mutex);
1087 /* register all slot objects under this bridge */
1088 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1,
1089 register_slot, NULL, bridge, NULL);
1090 if (ACPI_FAILURE(status)) {
1091 acpi_handle_err(handle, "failed to register slots\n");
1092 cleanup_bridge(bridge);
1093 put_bridge(bridge);
1097 /* Destroy hotplug slots associated with the PCI bus */
1098 void acpiphp_remove_slots(struct pci_bus *bus)
1100 struct acpiphp_bridge *bridge;
1102 if (acpiphp_disabled)
1103 return;
1105 mutex_lock(&bridge_mutex);
1106 list_for_each_entry(bridge, &bridge_list, list)
1107 if (bridge->pci_bus == bus) {
1108 mutex_unlock(&bridge_mutex);
1109 cleanup_bridge(bridge);
1110 put_bridge(bridge);
1111 return;
1114 mutex_unlock(&bridge_mutex);
1118 * acpiphp_enable_slot - power on slot
1119 * @slot: ACPI PHP slot
1121 int acpiphp_enable_slot(struct acpiphp_slot *slot)
1123 pci_lock_rescan_remove();
1125 if (slot->flags & SLOT_IS_GOING_AWAY)
1126 return -ENODEV;
1128 mutex_lock(&slot->crit_sect);
1129 /* configure all functions */
1130 if (!(slot->flags & SLOT_ENABLED))
1131 enable_slot(slot);
1133 mutex_unlock(&slot->crit_sect);
1135 pci_unlock_rescan_remove();
1136 return 0;
1140 * acpiphp_disable_and_eject_slot - power off and eject slot
1141 * @slot: ACPI PHP slot
1143 static int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot)
1145 struct acpiphp_func *func;
1147 if (slot->flags & SLOT_IS_GOING_AWAY)
1148 return -ENODEV;
1150 mutex_lock(&slot->crit_sect);
1152 /* unconfigure all functions */
1153 disable_slot(slot);
1155 list_for_each_entry(func, &slot->funcs, sibling)
1156 if (func->flags & FUNC_HAS_EJ0) {
1157 acpi_handle handle = func_to_handle(func);
1159 if (ACPI_FAILURE(acpi_evaluate_ej0(handle)))
1160 acpi_handle_err(handle, "_EJ0 failed\n");
1162 break;
1165 mutex_unlock(&slot->crit_sect);
1166 return 0;
1169 int acpiphp_disable_slot(struct acpiphp_slot *slot)
1171 int ret;
1173 pci_lock_rescan_remove();
1174 ret = acpiphp_disable_and_eject_slot(slot);
1175 pci_unlock_rescan_remove();
1176 return ret;
1180 * slot enabled: 1
1181 * slot disabled: 0
1183 u8 acpiphp_get_power_status(struct acpiphp_slot *slot)
1185 return (slot->flags & SLOT_ENABLED);
1189 * latch open: 1
1190 * latch closed: 0
1192 u8 acpiphp_get_latch_status(struct acpiphp_slot *slot)
1194 return !(get_slot_status(slot) & ACPI_STA_DEVICE_UI);
1198 * adapter presence : 1
1199 * absence : 0
1201 u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot)
1203 return !!get_slot_status(slot);