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
);
62 static int acpiphp_hotplug_event(struct acpi_device
*adev
, u32 type
);
63 static void acpiphp_sanitize_bus(struct pci_bus
*bus
);
64 static void acpiphp_set_hpp_values(struct pci_bus
*bus
);
65 static void hotplug_event(u32 type
, struct acpiphp_context
*context
);
66 static void free_bridge(struct kref
*kref
);
69 * acpiphp_init_context - Create hotplug context and grab a reference to it.
70 * @adev: ACPI device object to create the context for.
72 * Call under acpi_hp_context_lock.
74 static struct acpiphp_context
*acpiphp_init_context(struct acpi_device
*adev
)
76 struct acpiphp_context
*context
;
78 context
= kzalloc(sizeof(*context
), GFP_KERNEL
);
82 context
->refcount
= 1;
83 acpi_set_hp_context(adev
, &context
->hp
, acpiphp_hotplug_event
, NULL
);
88 * acpiphp_get_context - Get hotplug context and grab a reference to it.
89 * @adev: ACPI device object to get the context for.
91 * Call under acpi_hp_context_lock.
93 static struct acpiphp_context
*acpiphp_get_context(struct acpi_device
*adev
)
95 struct acpiphp_context
*context
;
100 context
= to_acpiphp_context(adev
->hp
);
106 * acpiphp_put_context - Drop a reference to ACPI hotplug context.
107 * @context: ACPI hotplug context to drop a reference to.
109 * The context object is removed if there are no more references to it.
111 * Call under acpi_hp_context_lock.
113 static void acpiphp_put_context(struct acpiphp_context
*context
)
115 if (--context
->refcount
)
118 WARN_ON(context
->bridge
);
119 context
->hp
.self
->hp
= NULL
;
123 static inline void get_bridge(struct acpiphp_bridge
*bridge
)
125 kref_get(&bridge
->ref
);
128 static inline void put_bridge(struct acpiphp_bridge
*bridge
)
130 kref_put(&bridge
->ref
, free_bridge
);
133 static void free_bridge(struct kref
*kref
)
135 struct acpiphp_context
*context
;
136 struct acpiphp_bridge
*bridge
;
137 struct acpiphp_slot
*slot
, *next
;
138 struct acpiphp_func
*func
, *tmp
;
140 acpi_lock_hp_context();
142 bridge
= container_of(kref
, struct acpiphp_bridge
, ref
);
144 list_for_each_entry_safe(slot
, next
, &bridge
->slots
, node
) {
145 list_for_each_entry_safe(func
, tmp
, &slot
->funcs
, sibling
)
146 acpiphp_put_context(func_to_context(func
));
151 context
= bridge
->context
;
152 /* Root bridges will not have hotplug context. */
154 /* Release the reference taken by acpiphp_enumerate_slots(). */
155 put_bridge(context
->func
.parent
);
156 context
->bridge
= NULL
;
157 acpiphp_put_context(context
);
160 put_device(&bridge
->pci_bus
->dev
);
161 pci_dev_put(bridge
->pci_dev
);
164 acpi_unlock_hp_context();
168 * the _DCK method can do funny things... and sometimes not
171 * TBD - figure out a way to only call fixups for
172 * systems that require them.
174 static void post_dock_fixups(acpi_handle not_used
, u32 event
, void *data
)
176 struct acpiphp_context
*context
= data
;
177 struct pci_bus
*bus
= context
->func
.slot
->bus
;
183 /* fixup bad _DCK function that rewrites
184 * secondary bridge on slot
186 pci_read_config_dword(bus
->self
,
190 if (((buses
>> 8) & 0xff) != bus
->busn_res
.start
) {
191 buses
= (buses
& 0xff000000)
192 | ((unsigned int)(bus
->primary
) << 0)
193 | ((unsigned int)(bus
->busn_res
.start
) << 8)
194 | ((unsigned int)(bus
->busn_res
.end
) << 16);
195 pci_write_config_dword(bus
->self
, PCI_PRIMARY_BUS
, buses
);
199 static void dock_event(acpi_handle handle
, u32 type
, void *data
)
201 struct acpi_device
*adev
;
203 adev
= acpi_bus_get_acpi_device(handle
);
205 acpiphp_hotplug_event(adev
, type
);
206 acpi_bus_put_acpi_device(adev
);
210 static const struct acpi_dock_ops acpiphp_dock_ops
= {
211 .fixup
= post_dock_fixups
,
212 .handler
= dock_event
,
215 /* Check whether the PCI device is managed by native PCIe hotplug driver */
216 static bool device_is_managed_by_native_pciehp(struct pci_dev
*pdev
)
220 struct acpi_pci_root
*root
;
222 /* Check whether the PCIe port supports native PCIe hotplug */
223 if (pcie_capability_read_dword(pdev
, PCI_EXP_SLTCAP
, ®32
))
225 if (!(reg32
& PCI_EXP_SLTCAP_HPC
))
229 * Check whether native PCIe hotplug has been enabled for
230 * this PCIe hierarchy.
232 tmp
= acpi_find_root_bridge_handle(pdev
);
235 root
= acpi_pci_find_root(tmp
);
238 if (!(root
->osc_control_set
& OSC_PCI_EXPRESS_NATIVE_HP_CONTROL
))
244 static void acpiphp_dock_init(void *data
)
246 struct acpiphp_context
*context
= data
;
248 get_bridge(context
->func
.parent
);
251 static void acpiphp_dock_release(void *data
)
253 struct acpiphp_context
*context
= data
;
255 put_bridge(context
->func
.parent
);
258 /* callback routine to register each ACPI PCI slot object */
259 static acpi_status
register_slot(acpi_handle handle
, u32 lvl
, void *data
,
262 struct acpiphp_bridge
*bridge
= data
;
263 struct acpiphp_context
*context
;
264 struct acpi_device
*adev
;
265 struct acpiphp_slot
*slot
;
266 struct acpiphp_func
*newfunc
;
267 acpi_status status
= AE_OK
;
268 unsigned long long adr
;
269 int device
, function
;
270 struct pci_bus
*pbus
= bridge
->pci_bus
;
271 struct pci_dev
*pdev
= bridge
->pci_dev
;
274 if (pdev
&& device_is_managed_by_native_pciehp(pdev
))
277 status
= acpi_evaluate_integer(handle
, "_ADR", NULL
, &adr
);
278 if (ACPI_FAILURE(status
)) {
279 if (status
!= AE_NOT_FOUND
)
280 acpi_handle_warn(handle
,
281 "can't evaluate _ADR (%#x)\n", status
);
284 if (acpi_bus_get_device(handle
, &adev
))
287 device
= (adr
>> 16) & 0xffff;
288 function
= adr
& 0xffff;
290 acpi_lock_hp_context();
291 context
= acpiphp_init_context(adev
);
293 acpi_unlock_hp_context();
294 acpi_handle_err(handle
, "No hotplug context\n");
297 newfunc
= &context
->func
;
298 newfunc
->function
= function
;
299 newfunc
->parent
= bridge
;
301 if (acpi_has_method(handle
, "_EJ0"))
302 newfunc
->flags
= FUNC_HAS_EJ0
;
304 if (acpi_has_method(handle
, "_STA"))
305 newfunc
->flags
|= FUNC_HAS_STA
;
307 acpi_unlock_hp_context();
309 /* search for objects that share the same slot */
310 list_for_each_entry(slot
, &bridge
->slots
, node
)
311 if (slot
->device
== device
)
314 slot
= kzalloc(sizeof(struct acpiphp_slot
), GFP_KERNEL
);
316 acpi_lock_hp_context();
317 acpiphp_put_context(context
);
318 acpi_unlock_hp_context();
322 slot
->bus
= bridge
->pci_bus
;
323 slot
->device
= device
;
324 INIT_LIST_HEAD(&slot
->funcs
);
326 list_add_tail(&slot
->node
, &bridge
->slots
);
328 /* Register slots for ejectable functions only. */
329 if (acpi_pci_check_ejectable(pbus
, handle
) || is_dock_device(handle
)) {
330 unsigned long long sun
;
334 status
= acpi_evaluate_integer(handle
, "_SUN", NULL
, &sun
);
335 if (ACPI_FAILURE(status
))
336 sun
= bridge
->nr_slots
;
338 pr_debug("found ACPI PCI Hotplug slot %llu at PCI %04x:%02x:%02x\n",
339 sun
, pci_domain_nr(pbus
), pbus
->number
, device
);
341 retval
= acpiphp_register_hotplug_slot(slot
, sun
);
345 if (retval
== -EBUSY
)
346 pr_warn("Slot %llu already registered by another "
347 "hotplug driver\n", sun
);
349 pr_warn("acpiphp_register_hotplug_slot failed "
350 "(err code = 0x%x)\n", retval
);
352 /* Even if the slot registration fails, we can still use it. */
356 newfunc
->slot
= slot
;
357 list_add_tail(&newfunc
->sibling
, &slot
->funcs
);
359 if (pci_bus_read_dev_vendor_id(pbus
, PCI_DEVFN(device
, function
),
361 slot
->flags
|= SLOT_ENABLED
;
363 if (is_dock_device(handle
)) {
364 /* we don't want to call this device's _EJ0
365 * because we want the dock notify handler
366 * to call it after it calls _DCK
368 newfunc
->flags
&= ~FUNC_HAS_EJ0
;
369 if (register_hotplug_dock_device(handle
,
370 &acpiphp_dock_ops
, context
,
371 acpiphp_dock_init
, acpiphp_dock_release
))
372 pr_debug("failed to register dock device\n");
378 static struct acpiphp_bridge
*acpiphp_dev_to_bridge(struct acpi_device
*adev
)
380 struct acpiphp_context
*context
;
381 struct acpiphp_bridge
*bridge
= NULL
;
383 acpi_lock_hp_context();
384 context
= acpiphp_get_context(adev
);
386 bridge
= context
->bridge
;
390 acpiphp_put_context(context
);
392 acpi_unlock_hp_context();
396 static void cleanup_bridge(struct acpiphp_bridge
*bridge
)
398 struct acpiphp_slot
*slot
;
399 struct acpiphp_func
*func
;
401 list_for_each_entry(slot
, &bridge
->slots
, node
) {
402 list_for_each_entry(func
, &slot
->funcs
, sibling
) {
403 struct acpi_device
*adev
= func_to_acpi_device(func
);
405 if (is_dock_device(adev
->handle
))
406 unregister_hotplug_dock_device(adev
->handle
);
408 acpi_lock_hp_context();
409 adev
->hp
->event
= NULL
;
410 acpi_unlock_hp_context();
412 slot
->flags
|= SLOT_IS_GOING_AWAY
;
414 acpiphp_unregister_hotplug_slot(slot
);
417 mutex_lock(&bridge_mutex
);
418 list_del(&bridge
->list
);
419 mutex_unlock(&bridge_mutex
);
421 acpi_lock_hp_context();
422 bridge
->is_going_away
= true;
423 acpi_unlock_hp_context();
427 * acpiphp_max_busnr - return the highest reserved bus number under the given bus.
428 * @bus: bus to start search with
430 static unsigned char acpiphp_max_busnr(struct pci_bus
*bus
)
432 struct list_head
*tmp
;
433 unsigned char max
, n
;
436 * pci_bus_max_busnr will return the highest
437 * reserved busnr for all these children.
438 * that is equivalent to the bus->subordinate
439 * value. We don't want to use the parent's
440 * bus->subordinate value because it could have
443 max
= bus
->busn_res
.start
;
445 list_for_each(tmp
, &bus
->children
) {
446 n
= pci_bus_max_busnr(pci_bus_b(tmp
));
453 static void acpiphp_set_acpi_region(struct acpiphp_slot
*slot
)
455 struct acpiphp_func
*func
;
456 union acpi_object params
[2];
457 struct acpi_object_list arg_list
;
459 list_for_each_entry(func
, &slot
->funcs
, sibling
) {
461 arg_list
.pointer
= params
;
462 params
[0].type
= ACPI_TYPE_INTEGER
;
463 params
[0].integer
.value
= ACPI_ADR_SPACE_PCI_CONFIG
;
464 params
[1].type
= ACPI_TYPE_INTEGER
;
465 params
[1].integer
.value
= 1;
466 /* _REG is optional, we don't care about if there is failure */
467 acpi_evaluate_object(func_to_handle(func
), "_REG", &arg_list
,
472 static void check_hotplug_bridge(struct acpiphp_slot
*slot
, struct pci_dev
*dev
)
474 struct acpiphp_func
*func
;
476 /* quirk, or pcie could set it already */
477 if (dev
->is_hotplug_bridge
)
480 list_for_each_entry(func
, &slot
->funcs
, sibling
) {
481 if (PCI_FUNC(dev
->devfn
) == func
->function
) {
482 dev
->is_hotplug_bridge
= 1;
488 static int acpiphp_rescan_slot(struct acpiphp_slot
*slot
)
490 struct acpiphp_func
*func
;
492 list_for_each_entry(func
, &slot
->funcs
, sibling
) {
493 struct acpi_device
*adev
= func_to_acpi_device(func
);
495 acpi_bus_scan(adev
->handle
);
496 if (acpi_device_enumerated(adev
))
497 acpi_device_set_power(adev
, ACPI_STATE_D0
);
499 return pci_scan_slot(slot
->bus
, PCI_DEVFN(slot
->device
, 0));
503 * enable_slot - enable, configure a slot
504 * @slot: slot to be enabled
506 * This function should be called per *physical slot*,
507 * not per each slot object in ACPI namespace.
509 static void __ref
enable_slot(struct acpiphp_slot
*slot
)
512 struct pci_bus
*bus
= slot
->bus
;
513 struct acpiphp_func
*func
;
517 acpiphp_rescan_slot(slot
);
518 max
= acpiphp_max_busnr(bus
);
519 for (pass
= 0; pass
< 2; pass
++) {
520 list_for_each_entry(dev
, &bus
->devices
, bus_list
) {
521 if (PCI_SLOT(dev
->devfn
) != slot
->device
)
524 if (dev
->hdr_type
== PCI_HEADER_TYPE_BRIDGE
||
525 dev
->hdr_type
== PCI_HEADER_TYPE_CARDBUS
) {
526 max
= pci_scan_bridge(bus
, dev
, max
, pass
);
527 if (pass
&& dev
->subordinate
) {
528 check_hotplug_bridge(slot
, dev
);
529 pcibios_resource_survey_bus(dev
->subordinate
);
530 __pci_bus_size_bridges(dev
->subordinate
,
536 __pci_bus_assign_resources(bus
, &add_list
, NULL
);
538 acpiphp_sanitize_bus(bus
);
539 acpiphp_set_hpp_values(bus
);
540 acpiphp_set_acpi_region(slot
);
542 list_for_each_entry(dev
, &bus
->devices
, bus_list
) {
543 /* Assume that newly added devices are powered on already. */
545 dev
->current_state
= PCI_D0
;
548 pci_bus_add_devices(bus
);
550 slot
->flags
|= SLOT_ENABLED
;
551 list_for_each_entry(func
, &slot
->funcs
, sibling
) {
552 dev
= pci_get_slot(bus
, PCI_DEVFN(slot
->device
,
555 /* Do not set SLOT_ENABLED flag if some funcs
557 slot
->flags
&= (~SLOT_ENABLED
);
564 * disable_slot - disable a slot
565 * @slot: ACPI PHP slot
567 static void disable_slot(struct acpiphp_slot
*slot
)
569 struct pci_bus
*bus
= slot
->bus
;
570 struct pci_dev
*dev
, *prev
;
571 struct acpiphp_func
*func
;
574 * enable_slot() enumerates all functions in this device via
575 * pci_scan_slot(), whether they have associated ACPI hotplug
576 * methods (_EJ0, etc.) or not. Therefore, we remove all functions
579 list_for_each_entry_safe_reverse(dev
, prev
, &bus
->devices
, bus_list
)
580 if (PCI_SLOT(dev
->devfn
) == slot
->device
)
581 pci_stop_and_remove_bus_device(dev
);
583 list_for_each_entry(func
, &slot
->funcs
, sibling
)
584 acpi_bus_trim(func_to_acpi_device(func
));
586 slot
->flags
&= (~SLOT_ENABLED
);
589 static bool acpiphp_no_hotplug(struct acpi_device
*adev
)
591 return adev
&& adev
->flags
.no_hotplug
;
594 static bool slot_no_hotplug(struct acpiphp_slot
*slot
)
596 struct acpiphp_func
*func
;
598 list_for_each_entry(func
, &slot
->funcs
, sibling
)
599 if (acpiphp_no_hotplug(func_to_acpi_device(func
)))
606 * get_slot_status - get ACPI slot status
607 * @slot: ACPI PHP slot
609 * If a slot has _STA for each function and if any one of them
610 * returned non-zero status, return it.
612 * If a slot doesn't have _STA and if any one of its functions'
613 * configuration space is configured, return 0x0f as a _STA.
615 * Otherwise return 0.
617 static unsigned int get_slot_status(struct acpiphp_slot
*slot
)
619 unsigned long long sta
= 0;
620 struct acpiphp_func
*func
;
622 list_for_each_entry(func
, &slot
->funcs
, sibling
) {
623 if (func
->flags
& FUNC_HAS_STA
) {
626 status
= acpi_evaluate_integer(func_to_handle(func
),
628 if (ACPI_SUCCESS(status
) && sta
)
633 pci_bus_read_config_dword(slot
->bus
,
634 PCI_DEVFN(slot
->device
,
636 PCI_VENDOR_ID
, &dvid
);
637 if (dvid
!= 0xffffffff) {
644 return (unsigned int)sta
;
647 static inline bool device_status_valid(unsigned int sta
)
650 * ACPI spec says that _STA may return bit 0 clear with bit 3 set
651 * if the device is valid but does not require a device driver to be
652 * loaded (Section 6.3.7 of ACPI 5.0A).
654 unsigned int mask
= ACPI_STA_DEVICE_ENABLED
| ACPI_STA_DEVICE_FUNCTIONING
;
655 return (sta
& mask
) == mask
;
659 * trim_stale_devices - remove PCI devices that are not responding.
660 * @dev: PCI device to start walking the hierarchy from.
662 static void trim_stale_devices(struct pci_dev
*dev
)
664 struct acpi_device
*adev
= ACPI_COMPANION(&dev
->dev
);
665 struct pci_bus
*bus
= dev
->subordinate
;
670 unsigned long long sta
;
672 status
= acpi_evaluate_integer(adev
->handle
, "_STA", NULL
, &sta
);
673 alive
= (ACPI_SUCCESS(status
) && device_status_valid(sta
))
674 || acpiphp_no_hotplug(adev
);
679 /* Check if the device responds. */
680 alive
= pci_bus_read_dev_vendor_id(dev
->bus
, dev
->devfn
, &v
, 0);
683 pci_stop_and_remove_bus_device(dev
);
687 struct pci_dev
*child
, *tmp
;
689 /* The device is a bridge. so check the bus below it. */
690 pm_runtime_get_sync(&dev
->dev
);
691 list_for_each_entry_safe_reverse(child
, tmp
, &bus
->devices
, bus_list
)
692 trim_stale_devices(child
);
694 pm_runtime_put(&dev
->dev
);
699 * acpiphp_check_bridge - re-enumerate devices
700 * @bridge: where to begin re-enumeration
702 * Iterate over all slots under this bridge and make sure that if a
703 * card is present they are enabled, and if not they are disabled.
705 static void acpiphp_check_bridge(struct acpiphp_bridge
*bridge
)
707 struct acpiphp_slot
*slot
;
709 /* Bail out if the bridge is going away. */
710 if (bridge
->is_going_away
)
713 list_for_each_entry(slot
, &bridge
->slots
, node
) {
714 struct pci_bus
*bus
= slot
->bus
;
715 struct pci_dev
*dev
, *tmp
;
717 if (slot_no_hotplug(slot
)) {
719 } else if (device_status_valid(get_slot_status(slot
))) {
720 /* remove stale devices if any */
721 list_for_each_entry_safe_reverse(dev
, tmp
,
722 &bus
->devices
, bus_list
)
723 if (PCI_SLOT(dev
->devfn
) == slot
->device
)
724 trim_stale_devices(dev
);
726 /* configure all functions */
734 static void acpiphp_set_hpp_values(struct pci_bus
*bus
)
738 list_for_each_entry(dev
, &bus
->devices
, bus_list
)
739 pci_configure_slot(dev
);
743 * Remove devices for which we could not assign resources, call
744 * arch specific code to fix-up the bus
746 static void acpiphp_sanitize_bus(struct pci_bus
*bus
)
748 struct pci_dev
*dev
, *tmp
;
750 unsigned long type_mask
= IORESOURCE_IO
| IORESOURCE_MEM
;
752 list_for_each_entry_safe_reverse(dev
, tmp
, &bus
->devices
, bus_list
) {
753 for (i
=0; i
<PCI_BRIDGE_RESOURCES
; i
++) {
754 struct resource
*res
= &dev
->resource
[i
];
755 if ((res
->flags
& type_mask
) && !res
->start
&&
757 /* Could not assign a required resources
758 * for this device, remove it */
759 pci_stop_and_remove_bus_device(dev
);
767 * ACPI event handlers
770 void acpiphp_check_host_bridge(struct acpi_device
*adev
)
772 struct acpiphp_bridge
*bridge
;
774 bridge
= acpiphp_dev_to_bridge(adev
);
776 pci_lock_rescan_remove();
778 acpiphp_check_bridge(bridge
);
780 pci_unlock_rescan_remove();
785 static int acpiphp_disable_and_eject_slot(struct acpiphp_slot
*slot
);
787 static void hotplug_event(u32 type
, struct acpiphp_context
*context
)
789 acpi_handle handle
= context
->hp
.self
->handle
;
790 struct acpiphp_func
*func
= &context
->func
;
791 struct acpiphp_slot
*slot
= func
->slot
;
792 struct acpiphp_bridge
*bridge
;
794 acpi_lock_hp_context();
795 bridge
= context
->bridge
;
799 acpi_unlock_hp_context();
801 pci_lock_rescan_remove();
804 case ACPI_NOTIFY_BUS_CHECK
:
805 /* bus re-enumerate */
806 acpi_handle_debug(handle
, "Bus check in %s()\n", __func__
);
808 acpiphp_check_bridge(bridge
);
809 else if (!(slot
->flags
& SLOT_IS_GOING_AWAY
))
814 case ACPI_NOTIFY_DEVICE_CHECK
:
816 acpi_handle_debug(handle
, "Device check in %s()\n", __func__
);
818 acpiphp_check_bridge(bridge
);
819 } else if (!(slot
->flags
& SLOT_IS_GOING_AWAY
)) {
821 * Check if anything has changed in the slot and rescan
822 * from the parent if that's the case.
824 if (acpiphp_rescan_slot(slot
))
825 acpiphp_check_bridge(func
->parent
);
829 case ACPI_NOTIFY_EJECT_REQUEST
:
830 /* request device eject */
831 acpi_handle_debug(handle
, "Eject request in %s()\n", __func__
);
832 acpiphp_disable_and_eject_slot(slot
);
836 pci_unlock_rescan_remove();
841 static int acpiphp_hotplug_event(struct acpi_device
*adev
, u32 type
)
843 struct acpiphp_context
*context
;
845 acpi_lock_hp_context();
846 context
= acpiphp_get_context(adev
);
847 if (!context
|| context
->func
.parent
->is_going_away
) {
848 acpi_unlock_hp_context();
851 get_bridge(context
->func
.parent
);
852 acpiphp_put_context(context
);
853 acpi_unlock_hp_context();
855 hotplug_event(type
, context
);
857 put_bridge(context
->func
.parent
);
862 * acpiphp_enumerate_slots - Enumerate PCI slots for a given bus.
863 * @bus: PCI bus to enumerate the slots for.
865 * A "slot" is an object associated with a PCI device number. All functions
866 * (PCI devices) with the same bus and device number belong to the same slot.
868 void acpiphp_enumerate_slots(struct pci_bus
*bus
)
870 struct acpiphp_bridge
*bridge
;
871 struct acpi_device
*adev
;
875 if (acpiphp_disabled
)
878 adev
= ACPI_COMPANION(bus
->bridge
);
882 handle
= adev
->handle
;
883 bridge
= kzalloc(sizeof(struct acpiphp_bridge
), GFP_KERNEL
);
885 acpi_handle_err(handle
, "No memory for bridge object\n");
889 INIT_LIST_HEAD(&bridge
->slots
);
890 kref_init(&bridge
->ref
);
891 bridge
->pci_dev
= pci_dev_get(bus
->self
);
892 bridge
->pci_bus
= bus
;
895 * Grab a ref to the subordinate PCI bus in case the bus is
896 * removed via PCI core logical hotplug. The ref pins the bus
897 * (which we access during module unload).
899 get_device(&bus
->dev
);
901 if (!pci_is_root_bus(bridge
->pci_bus
)) {
902 struct acpiphp_context
*context
;
905 * This bridge should have been registered as a hotplug function
906 * under its parent, so the context should be there, unless the
907 * parent is going to be handled by pciehp, in which case this
908 * bridge is not interesting to us either.
910 acpi_lock_hp_context();
911 context
= acpiphp_get_context(adev
);
913 acpi_unlock_hp_context();
914 put_device(&bus
->dev
);
915 pci_dev_put(bridge
->pci_dev
);
919 bridge
->context
= context
;
920 context
->bridge
= bridge
;
921 /* Get a reference to the parent bridge. */
922 get_bridge(context
->func
.parent
);
923 acpi_unlock_hp_context();
926 /* must be added to the list prior to calling register_slot */
927 mutex_lock(&bridge_mutex
);
928 list_add(&bridge
->list
, &bridge_list
);
929 mutex_unlock(&bridge_mutex
);
931 /* register all slot objects under this bridge */
932 status
= acpi_walk_namespace(ACPI_TYPE_DEVICE
, handle
, 1,
933 register_slot
, NULL
, bridge
, NULL
);
934 if (ACPI_FAILURE(status
)) {
935 acpi_handle_err(handle
, "failed to register slots\n");
936 cleanup_bridge(bridge
);
942 * acpiphp_remove_slots - Remove slot objects associated with a given bus.
943 * @bus: PCI bus to remove the slot objects for.
945 void acpiphp_remove_slots(struct pci_bus
*bus
)
947 struct acpiphp_bridge
*bridge
;
949 if (acpiphp_disabled
)
952 mutex_lock(&bridge_mutex
);
953 list_for_each_entry(bridge
, &bridge_list
, list
)
954 if (bridge
->pci_bus
== bus
) {
955 mutex_unlock(&bridge_mutex
);
956 cleanup_bridge(bridge
);
961 mutex_unlock(&bridge_mutex
);
965 * acpiphp_enable_slot - power on slot
966 * @slot: ACPI PHP slot
968 int acpiphp_enable_slot(struct acpiphp_slot
*slot
)
970 pci_lock_rescan_remove();
972 if (slot
->flags
& SLOT_IS_GOING_AWAY
)
975 /* configure all functions */
976 if (!(slot
->flags
& SLOT_ENABLED
))
979 pci_unlock_rescan_remove();
984 * acpiphp_disable_and_eject_slot - power off and eject slot
985 * @slot: ACPI PHP slot
987 static int acpiphp_disable_and_eject_slot(struct acpiphp_slot
*slot
)
989 struct acpiphp_func
*func
;
991 if (slot
->flags
& SLOT_IS_GOING_AWAY
)
994 /* unconfigure all functions */
997 list_for_each_entry(func
, &slot
->funcs
, sibling
)
998 if (func
->flags
& FUNC_HAS_EJ0
) {
999 acpi_handle handle
= func_to_handle(func
);
1001 if (ACPI_FAILURE(acpi_evaluate_ej0(handle
)))
1002 acpi_handle_err(handle
, "_EJ0 failed\n");
1010 int acpiphp_disable_slot(struct acpiphp_slot
*slot
)
1015 * Acquire acpi_scan_lock to ensure that the execution of _EJ0 in
1016 * acpiphp_disable_and_eject_slot() will be synchronized properly.
1018 acpi_scan_lock_acquire();
1019 pci_lock_rescan_remove();
1020 ret
= acpiphp_disable_and_eject_slot(slot
);
1021 pci_unlock_rescan_remove();
1022 acpi_scan_lock_release();
1030 u8
acpiphp_get_power_status(struct acpiphp_slot
*slot
)
1032 return (slot
->flags
& SLOT_ENABLED
);
1039 u8
acpiphp_get_latch_status(struct acpiphp_slot
*slot
)
1041 return !(get_slot_status(slot
) & ACPI_STA_DEVICE_UI
);
1045 * adapter presence : 1
1048 u8
acpiphp_get_adapter_status(struct acpiphp_slot
*slot
)
1050 return !!get_slot_status(slot
);