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 #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>
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. */
75 * acpiphp_init_context - Create hotplug context and grab a reference to it.
76 * @adev: ACPI device object to create the context for.
78 * Call under acpiphp_context_lock.
80 static struct acpiphp_context
*acpiphp_init_context(struct acpi_device
*adev
)
82 struct acpiphp_context
*context
;
85 context
= kzalloc(sizeof(*context
), GFP_KERNEL
);
90 context
->refcount
= 1;
91 status
= acpi_attach_data(adev
->handle
, acpiphp_context_handler
, context
);
92 if (ACPI_FAILURE(status
)) {
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
;
111 status
= acpi_get_data(handle
, acpiphp_context_handler
, &data
);
112 if (ACPI_SUCCESS(status
)) {
120 * acpiphp_put_context - Drop a reference to ACPI hotplug context.
121 * @context: ACPI hotplug context to drop a reference to.
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
)
132 WARN_ON(context
->bridge
);
133 acpi_detach_data(context
->adev
->handle
, acpiphp_context_handler
);
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
));
165 context
= bridge
->context
;
166 /* Root bridges will not have hotplug 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
);
178 mutex_unlock(&acpiphp_context_lock
);
182 * the _DCK method can do funny things... and sometimes not
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
;
197 /* fixup bad _DCK function that rewrites
198 * secondary bridge on slot
200 pci_read_config_dword(bus
->self
,
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
->adev
->handle
!= handle
)
220 || context
->func
.parent
->is_going_away
) {
221 mutex_unlock(&acpiphp_context_lock
);
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
)
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
, ®32
))
248 if (!(reg32
& PCI_EXP_SLTCAP_HPC
))
252 * Check whether native PCIe hotplug has been enabled for
253 * this PCIe hierarchy.
255 tmp
= acpi_find_root_bridge_handle(pdev
);
258 root
= acpi_pci_find_root(tmp
);
261 if (!(root
->osc_control_set
& OSC_PCI_EXPRESS_NATIVE_HP_CONTROL
))
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
,
285 struct acpiphp_bridge
*bridge
= data
;
286 struct acpiphp_context
*context
;
287 struct acpi_device
*adev
;
288 struct acpiphp_slot
*slot
;
289 struct acpiphp_func
*newfunc
;
290 acpi_status status
= AE_OK
;
291 unsigned long long adr
;
292 int device
, function
;
293 struct pci_bus
*pbus
= bridge
->pci_bus
;
294 struct pci_dev
*pdev
= bridge
->pci_dev
;
297 if (pdev
&& device_is_managed_by_native_pciehp(pdev
))
300 status
= acpi_evaluate_integer(handle
, "_ADR", NULL
, &adr
);
301 if (ACPI_FAILURE(status
)) {
302 if (status
!= AE_NOT_FOUND
)
303 acpi_handle_warn(handle
,
304 "can't evaluate _ADR (%#x)\n", status
);
307 if (acpi_bus_get_device(handle
, &adev
))
310 device
= (adr
>> 16) & 0xffff;
311 function
= adr
& 0xffff;
313 mutex_lock(&acpiphp_context_lock
);
314 context
= acpiphp_init_context(adev
);
316 mutex_unlock(&acpiphp_context_lock
);
317 acpi_handle_err(handle
, "No hotplug context\n");
320 newfunc
= &context
->func
;
321 newfunc
->function
= function
;
322 newfunc
->parent
= bridge
;
323 mutex_unlock(&acpiphp_context_lock
);
325 if (acpi_has_method(handle
, "_EJ0"))
326 newfunc
->flags
= FUNC_HAS_EJ0
;
328 if (acpi_has_method(handle
, "_STA"))
329 newfunc
->flags
|= FUNC_HAS_STA
;
331 if (acpi_has_method(handle
, "_DCK"))
332 newfunc
->flags
|= FUNC_HAS_DCK
;
334 /* search for objects that share the same slot */
335 list_for_each_entry(slot
, &bridge
->slots
, node
)
336 if (slot
->device
== device
)
339 slot
= kzalloc(sizeof(struct acpiphp_slot
), GFP_KERNEL
);
341 mutex_lock(&acpiphp_context_lock
);
342 acpiphp_put_context(context
);
343 mutex_unlock(&acpiphp_context_lock
);
347 slot
->bus
= bridge
->pci_bus
;
348 slot
->device
= device
;
349 INIT_LIST_HEAD(&slot
->funcs
);
351 list_add_tail(&slot
->node
, &bridge
->slots
);
353 /* Register slots for ejectable functions only. */
354 if (acpi_pci_check_ejectable(pbus
, handle
) || is_dock_device(handle
)) {
355 unsigned long long sun
;
359 status
= acpi_evaluate_integer(handle
, "_SUN", NULL
, &sun
);
360 if (ACPI_FAILURE(status
))
361 sun
= bridge
->nr_slots
;
363 pr_debug("found ACPI PCI Hotplug slot %llu at PCI %04x:%02x:%02x\n",
364 sun
, pci_domain_nr(pbus
), pbus
->number
, device
);
366 retval
= acpiphp_register_hotplug_slot(slot
, sun
);
370 if (retval
== -EBUSY
)
371 pr_warn("Slot %llu already registered by another "
372 "hotplug driver\n", sun
);
374 pr_warn("acpiphp_register_hotplug_slot failed "
375 "(err code = 0x%x)\n", retval
);
377 /* Even if the slot registration fails, we can still use it. */
381 newfunc
->slot
= slot
;
382 list_add_tail(&newfunc
->sibling
, &slot
->funcs
);
384 if (pci_bus_read_dev_vendor_id(pbus
, PCI_DEVFN(device
, function
),
386 slot
->flags
|= SLOT_ENABLED
;
388 if (is_dock_device(handle
)) {
389 /* we don't want to call this device's _EJ0
390 * because we want the dock notify handler
391 * to call it after it calls _DCK
393 newfunc
->flags
&= ~FUNC_HAS_EJ0
;
394 if (register_hotplug_dock_device(handle
,
395 &acpiphp_dock_ops
, context
,
396 acpiphp_dock_init
, acpiphp_dock_release
))
397 pr_debug("failed to register dock device\n");
400 /* install notify handler */
401 if (!(newfunc
->flags
& FUNC_HAS_DCK
)) {
402 status
= acpi_install_notify_handler(handle
, ACPI_SYSTEM_NOTIFY
,
403 handle_hotplug_event
,
405 if (ACPI_FAILURE(status
))
406 acpi_handle_err(handle
,
407 "failed to install notify handler\n");
413 static struct acpiphp_bridge
*acpiphp_handle_to_bridge(acpi_handle handle
)
415 struct acpiphp_context
*context
;
416 struct acpiphp_bridge
*bridge
= NULL
;
418 mutex_lock(&acpiphp_context_lock
);
419 context
= acpiphp_get_context(handle
);
421 bridge
= context
->bridge
;
425 acpiphp_put_context(context
);
427 mutex_unlock(&acpiphp_context_lock
);
431 static void cleanup_bridge(struct acpiphp_bridge
*bridge
)
433 struct acpiphp_slot
*slot
;
434 struct acpiphp_func
*func
;
437 list_for_each_entry(slot
, &bridge
->slots
, node
) {
438 list_for_each_entry(func
, &slot
->funcs
, sibling
) {
439 acpi_handle handle
= func_to_handle(func
);
441 if (is_dock_device(handle
))
442 unregister_hotplug_dock_device(handle
);
444 if (!(func
->flags
& FUNC_HAS_DCK
)) {
445 status
= acpi_remove_notify_handler(handle
,
447 handle_hotplug_event
);
448 if (ACPI_FAILURE(status
))
449 pr_err("failed to remove notify handler\n");
452 slot
->flags
|= SLOT_IS_GOING_AWAY
;
454 acpiphp_unregister_hotplug_slot(slot
);
457 mutex_lock(&bridge_mutex
);
458 list_del(&bridge
->list
);
459 mutex_unlock(&bridge_mutex
);
461 mutex_lock(&acpiphp_context_lock
);
462 bridge
->is_going_away
= true;
463 mutex_unlock(&acpiphp_context_lock
);
467 * acpiphp_max_busnr - return the highest reserved bus number under the given bus.
468 * @bus: bus to start search with
470 static unsigned char acpiphp_max_busnr(struct pci_bus
*bus
)
472 struct list_head
*tmp
;
473 unsigned char max
, n
;
476 * pci_bus_max_busnr will return the highest
477 * reserved busnr for all these children.
478 * that is equivalent to the bus->subordinate
479 * value. We don't want to use the parent's
480 * bus->subordinate value because it could have
483 max
= bus
->busn_res
.start
;
485 list_for_each(tmp
, &bus
->children
) {
486 n
= pci_bus_max_busnr(pci_bus_b(tmp
));
493 static void acpiphp_set_acpi_region(struct acpiphp_slot
*slot
)
495 struct acpiphp_func
*func
;
496 union acpi_object params
[2];
497 struct acpi_object_list arg_list
;
499 list_for_each_entry(func
, &slot
->funcs
, sibling
) {
501 arg_list
.pointer
= params
;
502 params
[0].type
= ACPI_TYPE_INTEGER
;
503 params
[0].integer
.value
= ACPI_ADR_SPACE_PCI_CONFIG
;
504 params
[1].type
= ACPI_TYPE_INTEGER
;
505 params
[1].integer
.value
= 1;
506 /* _REG is optional, we don't care about if there is failure */
507 acpi_evaluate_object(func_to_handle(func
), "_REG", &arg_list
,
512 static void check_hotplug_bridge(struct acpiphp_slot
*slot
, struct pci_dev
*dev
)
514 struct acpiphp_func
*func
;
516 /* quirk, or pcie could set it already */
517 if (dev
->is_hotplug_bridge
)
520 list_for_each_entry(func
, &slot
->funcs
, sibling
) {
521 if (PCI_FUNC(dev
->devfn
) == func
->function
) {
522 dev
->is_hotplug_bridge
= 1;
528 static int acpiphp_rescan_slot(struct acpiphp_slot
*slot
)
530 struct acpiphp_func
*func
;
532 list_for_each_entry(func
, &slot
->funcs
, sibling
) {
533 struct acpi_device
*adev
= func_to_acpi_device(func
);
535 acpi_bus_scan(adev
->handle
);
536 if (acpi_device_enumerated(adev
))
537 acpi_device_set_power(adev
, ACPI_STATE_D0
);
539 return pci_scan_slot(slot
->bus
, PCI_DEVFN(slot
->device
, 0));
543 * enable_slot - enable, configure a slot
544 * @slot: slot to be enabled
546 * This function should be called per *physical slot*,
547 * not per each slot object in ACPI namespace.
549 static void __ref
enable_slot(struct acpiphp_slot
*slot
)
552 struct pci_bus
*bus
= slot
->bus
;
553 struct acpiphp_func
*func
;
557 acpiphp_rescan_slot(slot
);
558 max
= acpiphp_max_busnr(bus
);
559 for (pass
= 0; pass
< 2; pass
++) {
560 list_for_each_entry(dev
, &bus
->devices
, bus_list
) {
561 if (PCI_SLOT(dev
->devfn
) != slot
->device
)
564 if (dev
->hdr_type
== PCI_HEADER_TYPE_BRIDGE
||
565 dev
->hdr_type
== PCI_HEADER_TYPE_CARDBUS
) {
566 max
= pci_scan_bridge(bus
, dev
, max
, pass
);
567 if (pass
&& dev
->subordinate
) {
568 check_hotplug_bridge(slot
, dev
);
569 pcibios_resource_survey_bus(dev
->subordinate
);
570 __pci_bus_size_bridges(dev
->subordinate
,
576 __pci_bus_assign_resources(bus
, &add_list
, NULL
);
578 acpiphp_sanitize_bus(bus
);
579 acpiphp_set_hpp_values(bus
);
580 acpiphp_set_acpi_region(slot
);
582 list_for_each_entry(dev
, &bus
->devices
, bus_list
) {
583 /* Assume that newly added devices are powered on already. */
585 dev
->current_state
= PCI_D0
;
588 pci_bus_add_devices(bus
);
590 slot
->flags
|= SLOT_ENABLED
;
591 list_for_each_entry(func
, &slot
->funcs
, sibling
) {
592 dev
= pci_get_slot(bus
, PCI_DEVFN(slot
->device
,
595 /* Do not set SLOT_ENABLED flag if some funcs
597 slot
->flags
&= (~SLOT_ENABLED
);
604 * disable_slot - disable a slot
605 * @slot: ACPI PHP slot
607 static void disable_slot(struct acpiphp_slot
*slot
)
609 struct pci_bus
*bus
= slot
->bus
;
610 struct pci_dev
*dev
, *prev
;
611 struct acpiphp_func
*func
;
614 * enable_slot() enumerates all functions in this device via
615 * pci_scan_slot(), whether they have associated ACPI hotplug
616 * methods (_EJ0, etc.) or not. Therefore, we remove all functions
619 list_for_each_entry_safe_reverse(dev
, prev
, &bus
->devices
, bus_list
)
620 if (PCI_SLOT(dev
->devfn
) == slot
->device
)
621 pci_stop_and_remove_bus_device(dev
);
623 list_for_each_entry(func
, &slot
->funcs
, sibling
)
624 acpi_bus_trim(func_to_acpi_device(func
));
626 slot
->flags
&= (~SLOT_ENABLED
);
629 static bool acpiphp_no_hotplug(struct acpi_device
*adev
)
631 return adev
&& adev
->flags
.no_hotplug
;
634 static bool slot_no_hotplug(struct acpiphp_slot
*slot
)
636 struct acpiphp_func
*func
;
638 list_for_each_entry(func
, &slot
->funcs
, sibling
)
639 if (acpiphp_no_hotplug(func_to_acpi_device(func
)))
646 * get_slot_status - get ACPI slot status
647 * @slot: ACPI PHP slot
649 * If a slot has _STA for each function and if any one of them
650 * returned non-zero status, return it.
652 * If a slot doesn't have _STA and if any one of its functions'
653 * configuration space is configured, return 0x0f as a _STA.
655 * Otherwise return 0.
657 static unsigned int get_slot_status(struct acpiphp_slot
*slot
)
659 unsigned long long sta
= 0;
660 struct acpiphp_func
*func
;
662 list_for_each_entry(func
, &slot
->funcs
, sibling
) {
663 if (func
->flags
& FUNC_HAS_STA
) {
666 status
= acpi_evaluate_integer(func_to_handle(func
),
668 if (ACPI_SUCCESS(status
) && sta
)
673 pci_bus_read_config_dword(slot
->bus
,
674 PCI_DEVFN(slot
->device
,
676 PCI_VENDOR_ID
, &dvid
);
677 if (dvid
!= 0xffffffff) {
684 return (unsigned int)sta
;
688 * trim_stale_devices - remove PCI devices that are not responding.
689 * @dev: PCI device to start walking the hierarchy from.
691 static void trim_stale_devices(struct pci_dev
*dev
)
693 struct acpi_device
*adev
= ACPI_COMPANION(&dev
->dev
);
694 struct pci_bus
*bus
= dev
->subordinate
;
699 unsigned long long sta
;
701 status
= acpi_evaluate_integer(adev
->handle
, "_STA", NULL
, &sta
);
702 alive
= (ACPI_SUCCESS(status
) && sta
== ACPI_STA_ALL
)
703 || acpiphp_no_hotplug(adev
);
708 /* Check if the device responds. */
709 alive
= pci_bus_read_dev_vendor_id(dev
->bus
, dev
->devfn
, &v
, 0);
712 pci_stop_and_remove_bus_device(dev
);
716 struct pci_dev
*child
, *tmp
;
718 /* The device is a bridge. so check the bus below it. */
719 pm_runtime_get_sync(&dev
->dev
);
720 list_for_each_entry_safe_reverse(child
, tmp
, &bus
->devices
, bus_list
)
721 trim_stale_devices(child
);
723 pm_runtime_put(&dev
->dev
);
728 * acpiphp_check_bridge - re-enumerate devices
729 * @bridge: where to begin re-enumeration
731 * Iterate over all slots under this bridge and make sure that if a
732 * card is present they are enabled, and if not they are disabled.
734 static void acpiphp_check_bridge(struct acpiphp_bridge
*bridge
)
736 struct acpiphp_slot
*slot
;
738 /* Bail out if the bridge is going away. */
739 if (bridge
->is_going_away
)
742 list_for_each_entry(slot
, &bridge
->slots
, node
) {
743 struct pci_bus
*bus
= slot
->bus
;
744 struct pci_dev
*dev
, *tmp
;
746 if (slot_no_hotplug(slot
)) {
748 } else if (get_slot_status(slot
) == ACPI_STA_ALL
) {
749 /* remove stale devices if any */
750 list_for_each_entry_safe_reverse(dev
, tmp
,
751 &bus
->devices
, bus_list
)
752 if (PCI_SLOT(dev
->devfn
) == slot
->device
)
753 trim_stale_devices(dev
);
755 /* configure all functions */
763 static void acpiphp_set_hpp_values(struct pci_bus
*bus
)
767 list_for_each_entry(dev
, &bus
->devices
, bus_list
)
768 pci_configure_slot(dev
);
772 * Remove devices for which we could not assign resources, call
773 * arch specific code to fix-up the bus
775 static void acpiphp_sanitize_bus(struct pci_bus
*bus
)
777 struct pci_dev
*dev
, *tmp
;
779 unsigned long type_mask
= IORESOURCE_IO
| IORESOURCE_MEM
;
781 list_for_each_entry_safe_reverse(dev
, tmp
, &bus
->devices
, bus_list
) {
782 for (i
=0; i
<PCI_BRIDGE_RESOURCES
; i
++) {
783 struct resource
*res
= &dev
->resource
[i
];
784 if ((res
->flags
& type_mask
) && !res
->start
&&
786 /* Could not assign a required resources
787 * for this device, remove it */
788 pci_stop_and_remove_bus_device(dev
);
796 * ACPI event handlers
799 void acpiphp_check_host_bridge(acpi_handle handle
)
801 struct acpiphp_bridge
*bridge
;
803 bridge
= acpiphp_handle_to_bridge(handle
);
805 pci_lock_rescan_remove();
807 acpiphp_check_bridge(bridge
);
809 pci_unlock_rescan_remove();
814 static int acpiphp_disable_and_eject_slot(struct acpiphp_slot
*slot
);
816 static void hotplug_event(acpi_handle handle
, u32 type
, void *data
)
818 struct acpiphp_context
*context
= data
;
819 struct acpiphp_func
*func
= &context
->func
;
820 struct acpiphp_slot
*slot
= func
->slot
;
821 struct acpiphp_bridge
*bridge
;
823 mutex_lock(&acpiphp_context_lock
);
824 bridge
= context
->bridge
;
828 mutex_unlock(&acpiphp_context_lock
);
830 pci_lock_rescan_remove();
833 case ACPI_NOTIFY_BUS_CHECK
:
834 /* bus re-enumerate */
835 acpi_handle_debug(handle
, "Bus check in %s()\n", __func__
);
837 acpiphp_check_bridge(bridge
);
838 else if (!(slot
->flags
& SLOT_IS_GOING_AWAY
))
843 case ACPI_NOTIFY_DEVICE_CHECK
:
845 acpi_handle_debug(handle
, "Device check in %s()\n", __func__
);
847 acpiphp_check_bridge(bridge
);
848 } else if (!(slot
->flags
& SLOT_IS_GOING_AWAY
)) {
850 * Check if anything has changed in the slot and rescan
851 * from the parent if that's the case.
853 if (acpiphp_rescan_slot(slot
))
854 acpiphp_check_bridge(func
->parent
);
858 case ACPI_NOTIFY_EJECT_REQUEST
:
859 /* request device eject */
860 acpi_handle_debug(handle
, "Eject request in %s()\n", __func__
);
861 acpiphp_disable_and_eject_slot(slot
);
865 pci_unlock_rescan_remove();
870 static void hotplug_event_work(void *data
, u32 type
)
872 struct acpiphp_context
*context
= data
;
873 acpi_handle handle
= context
->adev
->handle
;
875 acpi_scan_lock_acquire();
877 hotplug_event(handle
, type
, context
);
879 acpi_scan_lock_release();
880 acpi_evaluate_hotplug_ost(handle
, type
, ACPI_OST_SC_SUCCESS
, NULL
);
881 put_bridge(context
->func
.parent
);
885 * handle_hotplug_event - handle ACPI hotplug event
886 * @handle: Notify()'ed acpi_handle
888 * @data: pointer to acpiphp_context structure
890 * Handles ACPI event notification on slots.
892 static void handle_hotplug_event(acpi_handle handle
, u32 type
, void *data
)
894 struct acpiphp_context
*context
;
895 u32 ost_code
= ACPI_OST_SC_SUCCESS
;
899 case ACPI_NOTIFY_BUS_CHECK
:
900 case ACPI_NOTIFY_DEVICE_CHECK
:
902 case ACPI_NOTIFY_EJECT_REQUEST
:
903 ost_code
= ACPI_OST_SC_EJECT_IN_PROGRESS
;
904 acpi_evaluate_hotplug_ost(handle
, type
, ost_code
, NULL
);
907 case ACPI_NOTIFY_DEVICE_WAKE
:
910 case ACPI_NOTIFY_FREQUENCY_MISMATCH
:
911 acpi_handle_err(handle
, "Device cannot be configured due "
912 "to a frequency mismatch\n");
915 case ACPI_NOTIFY_BUS_MODE_MISMATCH
:
916 acpi_handle_err(handle
, "Device cannot be configured due "
917 "to a bus mode mismatch\n");
920 case ACPI_NOTIFY_POWER_FAULT
:
921 acpi_handle_err(handle
, "Device has suffered a power fault\n");
925 acpi_handle_warn(handle
, "Unsupported event type 0x%x\n", type
);
926 ost_code
= ACPI_OST_SC_UNRECOGNIZED_NOTIFY
;
930 mutex_lock(&acpiphp_context_lock
);
931 context
= acpiphp_get_context(handle
);
932 if (!context
|| WARN_ON(context
->adev
->handle
!= handle
)
933 || context
->func
.parent
->is_going_away
)
936 get_bridge(context
->func
.parent
);
937 acpiphp_put_context(context
);
938 status
= acpi_hotplug_execute(hotplug_event_work
, context
, type
);
939 if (ACPI_SUCCESS(status
)) {
940 mutex_unlock(&acpiphp_context_lock
);
943 put_bridge(context
->func
.parent
);
946 mutex_unlock(&acpiphp_context_lock
);
947 ost_code
= ACPI_OST_SC_NON_SPECIFIC_FAILURE
;
950 acpi_evaluate_hotplug_ost(handle
, type
, ost_code
, NULL
);
954 * acpiphp_enumerate_slots - Enumerate PCI slots for a given bus.
955 * @bus: PCI bus to enumerate the slots for.
957 * A "slot" is an object associated with a PCI device number. All functions
958 * (PCI devices) with the same bus and device number belong to the same slot.
960 void acpiphp_enumerate_slots(struct pci_bus
*bus
)
962 struct acpiphp_bridge
*bridge
;
963 struct acpi_device
*adev
;
967 if (acpiphp_disabled
)
970 adev
= ACPI_COMPANION(bus
->bridge
);
974 handle
= adev
->handle
;
975 bridge
= kzalloc(sizeof(struct acpiphp_bridge
), GFP_KERNEL
);
977 acpi_handle_err(handle
, "No memory for bridge object\n");
981 INIT_LIST_HEAD(&bridge
->slots
);
982 kref_init(&bridge
->ref
);
983 bridge
->pci_dev
= pci_dev_get(bus
->self
);
984 bridge
->pci_bus
= bus
;
987 * Grab a ref to the subordinate PCI bus in case the bus is
988 * removed via PCI core logical hotplug. The ref pins the bus
989 * (which we access during module unload).
991 get_device(&bus
->dev
);
993 if (!pci_is_root_bus(bridge
->pci_bus
)) {
994 struct acpiphp_context
*context
;
997 * This bridge should have been registered as a hotplug function
998 * under its parent, so the context should be there, unless the
999 * parent is going to be handled by pciehp, in which case this
1000 * bridge is not interesting to us either.
1002 mutex_lock(&acpiphp_context_lock
);
1003 context
= acpiphp_get_context(handle
);
1005 mutex_unlock(&acpiphp_context_lock
);
1006 put_device(&bus
->dev
);
1007 pci_dev_put(bridge
->pci_dev
);
1011 bridge
->context
= context
;
1012 context
->bridge
= bridge
;
1013 /* Get a reference to the parent bridge. */
1014 get_bridge(context
->func
.parent
);
1015 mutex_unlock(&acpiphp_context_lock
);
1018 /* must be added to the list prior to calling register_slot */
1019 mutex_lock(&bridge_mutex
);
1020 list_add(&bridge
->list
, &bridge_list
);
1021 mutex_unlock(&bridge_mutex
);
1023 /* register all slot objects under this bridge */
1024 status
= acpi_walk_namespace(ACPI_TYPE_DEVICE
, handle
, 1,
1025 register_slot
, NULL
, bridge
, NULL
);
1026 if (ACPI_FAILURE(status
)) {
1027 acpi_handle_err(handle
, "failed to register slots\n");
1028 cleanup_bridge(bridge
);
1034 * acpiphp_remove_slots - Remove slot objects associated with a given bus.
1035 * @bus: PCI bus to remove the slot objects for.
1037 void acpiphp_remove_slots(struct pci_bus
*bus
)
1039 struct acpiphp_bridge
*bridge
;
1041 if (acpiphp_disabled
)
1044 mutex_lock(&bridge_mutex
);
1045 list_for_each_entry(bridge
, &bridge_list
, list
)
1046 if (bridge
->pci_bus
== bus
) {
1047 mutex_unlock(&bridge_mutex
);
1048 cleanup_bridge(bridge
);
1053 mutex_unlock(&bridge_mutex
);
1057 * acpiphp_enable_slot - power on slot
1058 * @slot: ACPI PHP slot
1060 int acpiphp_enable_slot(struct acpiphp_slot
*slot
)
1062 pci_lock_rescan_remove();
1064 if (slot
->flags
& SLOT_IS_GOING_AWAY
)
1067 /* configure all functions */
1068 if (!(slot
->flags
& SLOT_ENABLED
))
1071 pci_unlock_rescan_remove();
1076 * acpiphp_disable_and_eject_slot - power off and eject slot
1077 * @slot: ACPI PHP slot
1079 static int acpiphp_disable_and_eject_slot(struct acpiphp_slot
*slot
)
1081 struct acpiphp_func
*func
;
1083 if (slot
->flags
& SLOT_IS_GOING_AWAY
)
1086 /* unconfigure all functions */
1089 list_for_each_entry(func
, &slot
->funcs
, sibling
)
1090 if (func
->flags
& FUNC_HAS_EJ0
) {
1091 acpi_handle handle
= func_to_handle(func
);
1093 if (ACPI_FAILURE(acpi_evaluate_ej0(handle
)))
1094 acpi_handle_err(handle
, "_EJ0 failed\n");
1102 int acpiphp_disable_slot(struct acpiphp_slot
*slot
)
1106 pci_lock_rescan_remove();
1107 ret
= acpiphp_disable_and_eject_slot(slot
);
1108 pci_unlock_rescan_remove();
1116 u8
acpiphp_get_power_status(struct acpiphp_slot
*slot
)
1118 return (slot
->flags
& SLOT_ENABLED
);
1125 u8
acpiphp_get_latch_status(struct acpiphp_slot
*slot
)
1127 return !(get_slot_status(slot
) & ACPI_STA_DEVICE_UI
);
1131 * adapter presence : 1
1134 u8
acpiphp_get_adapter_status(struct acpiphp_slot
*slot
)
1136 return !!get_slot_status(slot
);