2 * ACPI PCI HotPlug glue functions to ACPI CA subsystem
4 * Copyright (C) 2002,2003 Takayoshi Kochi (t-kochi@bq.jp.nec.com)
5 * Copyright (C) 2002 Hiroshi Aono (h-aono@ap.jp.nec.com)
6 * Copyright (C) 2002,2003 NEC Corporation
7 * Copyright (C) 2003-2005 Matthew Wilcox (matthew.wilcox@hp.com)
8 * Copyright (C) 2003-2005 Hewlett Packard
9 * Copyright (C) 2005 Rajesh Shah (rajesh.shah@intel.com)
10 * Copyright (C) 2005 Intel Corporation
12 * All rights reserved.
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or (at
17 * your option) any later version.
19 * This program is distributed in the hope that it will be useful, but
20 * WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
22 * NON INFRINGEMENT. See the GNU General Public License for more
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, write to the Free Software
27 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
29 * Send feedback to <kristen.c.accardi@intel.com>
34 * Lifetime rules for pci_dev:
35 * - The one in acpiphp_bridge has its refcount elevated by pci_get_slot()
36 * when the bridge is scanned and it loses a refcount when the bridge
38 * - When a P2P bridge is present, we elevate the refcount on the subordinate
39 * bus. It loses the refcount when the the driver unloads.
42 #include <linux/init.h>
43 #include <linux/module.h>
45 #include <linux/kernel.h>
46 #include <linux/pci.h>
47 #include <linux/pci_hotplug.h>
48 #include <linux/pci-acpi.h>
49 #include <linux/mutex.h>
50 #include <linux/slab.h>
51 #include <linux/acpi.h>
56 static LIST_HEAD(bridge_list
);
57 static DEFINE_MUTEX(bridge_mutex
);
58 static DEFINE_MUTEX(acpiphp_context_lock
);
60 #define MY_NAME "acpiphp_glue"
62 static void handle_hotplug_event(acpi_handle handle
, u32 type
, void *data
);
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(acpi_handle handle
, u32 type
, void *data
);
66 static void free_bridge(struct kref
*kref
);
68 static void acpiphp_context_handler(acpi_handle handle
, void *context
)
70 /* Intentionally empty. */
74 * acpiphp_init_context - Create hotplug context and grab a reference to it.
75 * @handle: ACPI object handle to create the context for.
77 * Call under acpiphp_context_lock.
79 static struct acpiphp_context
*acpiphp_init_context(acpi_handle handle
)
81 struct acpiphp_context
*context
;
84 context
= kzalloc(sizeof(*context
), GFP_KERNEL
);
88 context
->handle
= handle
;
89 context
->refcount
= 1;
90 status
= acpi_attach_data(handle
, acpiphp_context_handler
, context
);
91 if (ACPI_FAILURE(status
)) {
99 * acpiphp_get_context - Get hotplug context and grab a reference to it.
100 * @handle: ACPI object handle to get the context for.
102 * Call under acpiphp_context_lock.
104 static struct acpiphp_context
*acpiphp_get_context(acpi_handle handle
)
106 struct acpiphp_context
*context
= NULL
;
110 status
= acpi_get_data(handle
, acpiphp_context_handler
, &data
);
111 if (ACPI_SUCCESS(status
)) {
119 * acpiphp_put_context - Drop a reference to ACPI hotplug context.
120 * @handle: ACPI object handle to put the context for.
122 * The context object is removed if there are no more references to it.
124 * Call under acpiphp_context_lock.
126 static void acpiphp_put_context(struct acpiphp_context
*context
)
128 if (--context
->refcount
)
131 WARN_ON(context
->bridge
);
132 acpi_detach_data(context
->handle
, acpiphp_context_handler
);
136 static inline void get_bridge(struct acpiphp_bridge
*bridge
)
138 kref_get(&bridge
->ref
);
141 static inline void put_bridge(struct acpiphp_bridge
*bridge
)
143 kref_put(&bridge
->ref
, free_bridge
);
146 static void free_bridge(struct kref
*kref
)
148 struct acpiphp_context
*context
;
149 struct acpiphp_bridge
*bridge
;
150 struct acpiphp_slot
*slot
, *next
;
151 struct acpiphp_func
*func
, *tmp
;
153 mutex_lock(&acpiphp_context_lock
);
155 bridge
= container_of(kref
, struct acpiphp_bridge
, ref
);
157 list_for_each_entry_safe(slot
, next
, &bridge
->slots
, node
) {
158 list_for_each_entry_safe(func
, tmp
, &slot
->funcs
, sibling
)
159 acpiphp_put_context(func_to_context(func
));
164 context
= bridge
->context
;
165 /* Root bridges will not have hotplug context. */
167 /* Release the reference taken by acpiphp_enumerate_slots(). */
168 put_bridge(context
->func
.parent
);
169 context
->bridge
= NULL
;
170 acpiphp_put_context(context
);
173 put_device(&bridge
->pci_bus
->dev
);
174 pci_dev_put(bridge
->pci_dev
);
177 mutex_unlock(&acpiphp_context_lock
);
181 * the _DCK method can do funny things... and sometimes not
184 * TBD - figure out a way to only call fixups for
185 * systems that require them.
187 static void post_dock_fixups(acpi_handle not_used
, u32 event
, void *data
)
189 struct acpiphp_context
*context
= data
;
190 struct pci_bus
*bus
= context
->func
.slot
->bus
;
196 /* fixup bad _DCK function that rewrites
197 * secondary bridge on slot
199 pci_read_config_dword(bus
->self
,
203 if (((buses
>> 8) & 0xff) != bus
->busn_res
.start
) {
204 buses
= (buses
& 0xff000000)
205 | ((unsigned int)(bus
->primary
) << 0)
206 | ((unsigned int)(bus
->busn_res
.start
) << 8)
207 | ((unsigned int)(bus
->busn_res
.end
) << 16);
208 pci_write_config_dword(bus
->self
, PCI_PRIMARY_BUS
, buses
);
213 static const struct acpi_dock_ops acpiphp_dock_ops
= {
214 .fixup
= post_dock_fixups
,
215 .handler
= hotplug_event
,
218 /* Check whether the PCI device is managed by native PCIe hotplug driver */
219 static bool device_is_managed_by_native_pciehp(struct pci_dev
*pdev
)
223 struct acpi_pci_root
*root
;
225 /* Check whether the PCIe port supports native PCIe hotplug */
226 if (pcie_capability_read_dword(pdev
, PCI_EXP_SLTCAP
, ®32
))
228 if (!(reg32
& PCI_EXP_SLTCAP_HPC
))
232 * Check whether native PCIe hotplug has been enabled for
233 * this PCIe hierarchy.
235 tmp
= acpi_find_root_bridge_handle(pdev
);
238 root
= acpi_pci_find_root(tmp
);
241 if (!(root
->osc_control_set
& OSC_PCI_EXPRESS_NATIVE_HP_CONTROL
))
247 static void acpiphp_dock_init(void *data
)
249 struct acpiphp_context
*context
= data
;
251 get_bridge(context
->func
.parent
);
254 static void acpiphp_dock_release(void *data
)
256 struct acpiphp_context
*context
= data
;
258 put_bridge(context
->func
.parent
);
261 /* callback routine to register each ACPI PCI slot object */
262 static acpi_status
register_slot(acpi_handle handle
, u32 lvl
, void *data
,
265 struct acpiphp_bridge
*bridge
= data
;
266 struct acpiphp_context
*context
;
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
;
276 if (pdev
&& device_is_managed_by_native_pciehp(pdev
))
279 status
= acpi_evaluate_integer(handle
, "_ADR", NULL
, &adr
);
280 if (ACPI_FAILURE(status
)) {
281 acpi_handle_warn(handle
, "can't evaluate _ADR (%#x)\n", status
);
285 device
= (adr
>> 16) & 0xffff;
286 function
= adr
& 0xffff;
288 mutex_lock(&acpiphp_context_lock
);
289 context
= acpiphp_init_context(handle
);
291 mutex_unlock(&acpiphp_context_lock
);
292 acpi_handle_err(handle
, "No hotplug context\n");
295 newfunc
= &context
->func
;
296 newfunc
->function
= function
;
297 newfunc
->parent
= bridge
;
298 mutex_unlock(&acpiphp_context_lock
);
300 if (acpi_has_method(handle
, "_EJ0"))
301 newfunc
->flags
= FUNC_HAS_EJ0
;
303 if (acpi_has_method(handle
, "_STA"))
304 newfunc
->flags
|= FUNC_HAS_STA
;
306 if (acpi_has_method(handle
, "_PS0"))
307 newfunc
->flags
|= FUNC_HAS_PS0
;
309 if (acpi_has_method(handle
, "_PS3"))
310 newfunc
->flags
|= FUNC_HAS_PS3
;
312 if (acpi_has_method(handle
, "_DCK"))
313 newfunc
->flags
|= FUNC_HAS_DCK
;
315 /* search for objects that share the same slot */
316 list_for_each_entry(slot
, &bridge
->slots
, node
)
317 if (slot
->device
== device
)
320 slot
= kzalloc(sizeof(struct acpiphp_slot
), GFP_KERNEL
);
322 status
= AE_NO_MEMORY
;
326 slot
->bus
= bridge
->pci_bus
;
327 slot
->device
= device
;
328 INIT_LIST_HEAD(&slot
->funcs
);
329 mutex_init(&slot
->crit_sect
);
331 mutex_lock(&bridge_mutex
);
332 list_add_tail(&slot
->node
, &bridge
->slots
);
333 mutex_unlock(&bridge_mutex
);
335 /* Register slots for ejectable funtions only. */
336 if (acpi_pci_check_ejectable(pbus
, handle
) || is_dock_device(handle
)) {
337 unsigned long long sun
;
341 status
= acpi_evaluate_integer(handle
, "_SUN", NULL
, &sun
);
342 if (ACPI_FAILURE(status
))
343 sun
= bridge
->nr_slots
;
345 dbg("found ACPI PCI Hotplug slot %llu at PCI %04x:%02x:%02x\n",
346 sun
, pci_domain_nr(pbus
), pbus
->number
, device
);
348 retval
= acpiphp_register_hotplug_slot(slot
, sun
);
351 if (retval
== -EBUSY
)
352 warn("Slot %llu already registered by another "
353 "hotplug driver\n", sun
);
355 warn("acpiphp_register_hotplug_slot failed "
356 "(err code = 0x%x)\n", retval
);
358 /* Even if the slot registration fails, we can still use it. */
362 newfunc
->slot
= slot
;
363 mutex_lock(&bridge_mutex
);
364 list_add_tail(&newfunc
->sibling
, &slot
->funcs
);
365 mutex_unlock(&bridge_mutex
);
367 if (pci_bus_read_dev_vendor_id(pbus
, PCI_DEVFN(device
, function
),
369 slot
->flags
|= (SLOT_ENABLED
| SLOT_POWEREDON
);
371 if (is_dock_device(handle
)) {
372 /* we don't want to call this device's _EJ0
373 * because we want the dock notify handler
374 * to call it after it calls _DCK
376 newfunc
->flags
&= ~FUNC_HAS_EJ0
;
377 if (register_hotplug_dock_device(handle
,
378 &acpiphp_dock_ops
, context
,
379 acpiphp_dock_init
, acpiphp_dock_release
))
380 dbg("failed to register dock device\n");
383 /* install notify handler */
384 if (!(newfunc
->flags
& FUNC_HAS_DCK
)) {
385 status
= acpi_install_notify_handler(handle
, ACPI_SYSTEM_NOTIFY
,
386 handle_hotplug_event
,
388 if (ACPI_FAILURE(status
))
389 acpi_handle_err(handle
,
390 "failed to install notify handler\n");
396 mutex_lock(&acpiphp_context_lock
);
397 acpiphp_put_context(context
);
398 mutex_unlock(&acpiphp_context_lock
);
402 static struct acpiphp_bridge
*acpiphp_handle_to_bridge(acpi_handle handle
)
404 struct acpiphp_context
*context
;
405 struct acpiphp_bridge
*bridge
= NULL
;
407 mutex_lock(&acpiphp_context_lock
);
408 context
= acpiphp_get_context(handle
);
410 bridge
= context
->bridge
;
414 acpiphp_put_context(context
);
416 mutex_unlock(&acpiphp_context_lock
);
420 static void cleanup_bridge(struct acpiphp_bridge
*bridge
)
422 struct acpiphp_slot
*slot
;
423 struct acpiphp_func
*func
;
426 list_for_each_entry(slot
, &bridge
->slots
, node
) {
427 list_for_each_entry(func
, &slot
->funcs
, sibling
) {
428 acpi_handle handle
= func_to_handle(func
);
430 if (is_dock_device(handle
))
431 unregister_hotplug_dock_device(handle
);
433 if (!(func
->flags
& FUNC_HAS_DCK
)) {
434 status
= acpi_remove_notify_handler(handle
,
436 handle_hotplug_event
);
437 if (ACPI_FAILURE(status
))
438 err("failed to remove notify handler\n");
441 acpiphp_unregister_hotplug_slot(slot
);
444 mutex_lock(&bridge_mutex
);
445 list_del(&bridge
->list
);
446 mutex_unlock(&bridge_mutex
);
449 static int power_on_slot(struct acpiphp_slot
*slot
)
452 struct acpiphp_func
*func
;
455 /* if already enabled, just skip */
456 if (slot
->flags
& SLOT_POWEREDON
)
459 list_for_each_entry(func
, &slot
->funcs
, sibling
) {
460 if (func
->flags
& FUNC_HAS_PS0
) {
461 dbg("%s: executing _PS0\n", __func__
);
462 status
= acpi_evaluate_object(func_to_handle(func
),
464 if (ACPI_FAILURE(status
)) {
465 warn("%s: _PS0 failed\n", __func__
);
473 /* TBD: evaluate _STA to check if the slot is enabled */
475 slot
->flags
|= SLOT_POWEREDON
;
482 static int power_off_slot(struct acpiphp_slot
*slot
)
485 struct acpiphp_func
*func
;
489 /* if already disabled, just skip */
490 if ((slot
->flags
& SLOT_POWEREDON
) == 0)
493 list_for_each_entry(func
, &slot
->funcs
, sibling
) {
494 if (func
->flags
& FUNC_HAS_PS3
) {
495 status
= acpi_evaluate_object(func_to_handle(func
),
497 if (ACPI_FAILURE(status
)) {
498 warn("%s: _PS3 failed\n", __func__
);
506 /* TBD: evaluate _STA to check if the slot is disabled */
508 slot
->flags
&= (~SLOT_POWEREDON
);
517 * acpiphp_max_busnr - return the highest reserved bus number under the given bus.
518 * @bus: bus to start search with
520 static unsigned char acpiphp_max_busnr(struct pci_bus
*bus
)
522 struct list_head
*tmp
;
523 unsigned char max
, n
;
526 * pci_bus_max_busnr will return the highest
527 * reserved busnr for all these children.
528 * that is equivalent to the bus->subordinate
529 * value. We don't want to use the parent's
530 * bus->subordinate value because it could have
533 max
= bus
->busn_res
.start
;
535 list_for_each(tmp
, &bus
->children
) {
536 n
= pci_bus_max_busnr(pci_bus_b(tmp
));
544 * acpiphp_bus_trim - Trim device objects in an ACPI namespace subtree.
545 * @handle: ACPI device object handle to start from.
547 static void acpiphp_bus_trim(acpi_handle handle
)
549 struct acpi_device
*adev
= NULL
;
551 acpi_bus_get_device(handle
, &adev
);
557 * acpiphp_bus_add - Scan ACPI namespace subtree.
558 * @handle: ACPI object handle to start the scan from.
560 static void acpiphp_bus_add(acpi_handle handle
)
562 acpiphp_bus_trim(handle
);
563 acpi_bus_scan(handle
);
566 static void acpiphp_set_acpi_region(struct acpiphp_slot
*slot
)
568 struct acpiphp_func
*func
;
569 union acpi_object params
[2];
570 struct acpi_object_list arg_list
;
572 list_for_each_entry(func
, &slot
->funcs
, sibling
) {
574 arg_list
.pointer
= params
;
575 params
[0].type
= ACPI_TYPE_INTEGER
;
576 params
[0].integer
.value
= ACPI_ADR_SPACE_PCI_CONFIG
;
577 params
[1].type
= ACPI_TYPE_INTEGER
;
578 params
[1].integer
.value
= 1;
579 /* _REG is optional, we don't care about if there is failure */
580 acpi_evaluate_object(func_to_handle(func
), "_REG", &arg_list
,
585 static void check_hotplug_bridge(struct acpiphp_slot
*slot
, struct pci_dev
*dev
)
587 struct acpiphp_func
*func
;
589 /* quirk, or pcie could set it already */
590 if (dev
->is_hotplug_bridge
)
593 list_for_each_entry(func
, &slot
->funcs
, sibling
) {
594 if (PCI_FUNC(dev
->devfn
) == func
->function
) {
595 dev
->is_hotplug_bridge
= 1;
602 * enable_device - enable, configure a slot
603 * @slot: slot to be enabled
605 * This function should be called per *physical slot*,
606 * not per each slot object in ACPI namespace.
608 static int __ref
enable_device(struct acpiphp_slot
*slot
)
611 struct pci_bus
*bus
= slot
->bus
;
612 struct acpiphp_func
*func
;
616 if (slot
->flags
& SLOT_ENABLED
)
619 list_for_each_entry(func
, &slot
->funcs
, sibling
)
620 acpiphp_bus_add(func_to_handle(func
));
622 num
= pci_scan_slot(bus
, PCI_DEVFN(slot
->device
, 0));
624 /* Maybe only part of funcs are added. */
625 dbg("No new device found\n");
629 max
= acpiphp_max_busnr(bus
);
630 for (pass
= 0; pass
< 2; pass
++) {
631 list_for_each_entry(dev
, &bus
->devices
, bus_list
) {
632 if (PCI_SLOT(dev
->devfn
) != slot
->device
)
634 if (dev
->hdr_type
== PCI_HEADER_TYPE_BRIDGE
||
635 dev
->hdr_type
== PCI_HEADER_TYPE_CARDBUS
) {
636 max
= pci_scan_bridge(bus
, dev
, max
, pass
);
637 if (pass
&& dev
->subordinate
) {
638 check_hotplug_bridge(slot
, dev
);
639 pcibios_resource_survey_bus(dev
->subordinate
);
640 __pci_bus_size_bridges(dev
->subordinate
,
647 __pci_bus_assign_resources(bus
, &add_list
, NULL
);
648 acpiphp_sanitize_bus(bus
);
649 acpiphp_set_hpp_values(bus
);
650 acpiphp_set_acpi_region(slot
);
651 pci_enable_bridges(bus
);
653 list_for_each_entry(dev
, &bus
->devices
, bus_list
) {
654 /* Assume that newly added devices are powered on already. */
656 dev
->current_state
= PCI_D0
;
659 pci_bus_add_devices(bus
);
661 slot
->flags
|= SLOT_ENABLED
;
662 list_for_each_entry(func
, &slot
->funcs
, sibling
) {
663 dev
= pci_get_slot(bus
, PCI_DEVFN(slot
->device
,
666 /* Do not set SLOT_ENABLED flag if some funcs
668 slot
->flags
&= (~SLOT_ENABLED
);
678 /* return first device in slot, acquiring a reference on it */
679 static struct pci_dev
*dev_in_slot(struct acpiphp_slot
*slot
)
681 struct pci_bus
*bus
= slot
->bus
;
683 struct pci_dev
*ret
= NULL
;
685 down_read(&pci_bus_sem
);
686 list_for_each_entry(dev
, &bus
->devices
, bus_list
)
687 if (PCI_SLOT(dev
->devfn
) == slot
->device
) {
688 ret
= pci_dev_get(dev
);
691 up_read(&pci_bus_sem
);
697 * disable_device - disable a slot
698 * @slot: ACPI PHP slot
700 static int disable_device(struct acpiphp_slot
*slot
)
702 struct acpiphp_func
*func
;
703 struct pci_dev
*pdev
;
706 * enable_device() enumerates all functions in this device via
707 * pci_scan_slot(), whether they have associated ACPI hotplug
708 * methods (_EJ0, etc.) or not. Therefore, we remove all functions
711 while ((pdev
= dev_in_slot(slot
))) {
712 pci_stop_and_remove_bus_device(pdev
);
716 list_for_each_entry(func
, &slot
->funcs
, sibling
)
717 acpiphp_bus_trim(func_to_handle(func
));
719 slot
->flags
&= (~SLOT_ENABLED
);
726 * get_slot_status - get ACPI slot status
727 * @slot: ACPI PHP slot
729 * If a slot has _STA for each function and if any one of them
730 * returned non-zero status, return it.
732 * If a slot doesn't have _STA and if any one of its functions'
733 * configuration space is configured, return 0x0f as a _STA.
735 * Otherwise return 0.
737 static unsigned int get_slot_status(struct acpiphp_slot
*slot
)
739 unsigned long long sta
= 0;
740 struct acpiphp_func
*func
;
742 list_for_each_entry(func
, &slot
->funcs
, sibling
) {
743 if (func
->flags
& FUNC_HAS_STA
) {
746 status
= acpi_evaluate_integer(func_to_handle(func
),
748 if (ACPI_SUCCESS(status
) && sta
)
753 pci_bus_read_config_dword(slot
->bus
,
754 PCI_DEVFN(slot
->device
,
756 PCI_VENDOR_ID
, &dvid
);
757 if (dvid
!= 0xffffffff) {
764 return (unsigned int)sta
;
768 * acpiphp_check_bridge - re-enumerate devices
769 * @bridge: where to begin re-enumeration
771 * Iterate over all slots under this bridge and make sure that if a
772 * card is present they are enabled, and if not they are disabled.
774 static int acpiphp_check_bridge(struct acpiphp_bridge
*bridge
)
776 struct acpiphp_slot
*slot
;
778 int enabled
, disabled
;
780 enabled
= disabled
= 0;
782 list_for_each_entry(slot
, &bridge
->slots
, node
) {
783 unsigned int status
= get_slot_status(slot
);
784 if (slot
->flags
& SLOT_ENABLED
) {
785 if (status
== ACPI_STA_ALL
)
788 retval
= acpiphp_disable_and_eject_slot(slot
);
794 if (status
!= ACPI_STA_ALL
)
796 retval
= acpiphp_enable_slot(slot
);
798 err("Error occurred in enabling\n");
805 dbg("%s: %d enabled, %d disabled\n", __func__
, enabled
, disabled
);
811 static void acpiphp_set_hpp_values(struct pci_bus
*bus
)
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
;
827 unsigned long type_mask
= IORESOURCE_IO
| IORESOURCE_MEM
;
829 list_for_each_entry_safe(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
&&
834 /* Could not assign a required resources
835 * for this device, remove it */
836 pci_stop_and_remove_bus_device(dev
);
844 * ACPI event handlers
848 check_sub_bridges(acpi_handle handle
, u32 lvl
, void *context
, void **rv
)
850 struct acpiphp_bridge
*bridge
;
852 struct acpi_buffer buffer
= { .length
= sizeof(objname
),
853 .pointer
= objname
};
855 bridge
= acpiphp_handle_to_bridge(handle
);
857 acpi_get_name(handle
, ACPI_FULL_PATHNAME
, &buffer
);
858 dbg("%s: re-enumerating slots under %s\n",
860 acpiphp_check_bridge(bridge
);
866 void acpiphp_check_host_bridge(acpi_handle handle
)
868 struct acpiphp_bridge
*bridge
;
870 bridge
= acpiphp_handle_to_bridge(handle
);
872 acpiphp_check_bridge(bridge
);
876 acpi_walk_namespace(ACPI_TYPE_DEVICE
, handle
,
877 ACPI_UINT32_MAX
, check_sub_bridges
, NULL
, NULL
, NULL
);
880 static void hotplug_event(acpi_handle handle
, u32 type
, void *data
)
882 struct acpiphp_context
*context
= data
;
883 struct acpiphp_func
*func
= &context
->func
;
884 struct acpiphp_bridge
*bridge
;
886 struct acpi_buffer buffer
= { .length
= sizeof(objname
),
887 .pointer
= objname
};
889 mutex_lock(&acpiphp_context_lock
);
890 bridge
= context
->bridge
;
894 mutex_unlock(&acpiphp_context_lock
);
896 acpi_get_name(handle
, ACPI_FULL_PATHNAME
, &buffer
);
899 case ACPI_NOTIFY_BUS_CHECK
:
900 /* bus re-enumerate */
901 dbg("%s: Bus check notify on %s\n", __func__
, objname
);
902 dbg("%s: re-enumerating slots under %s\n", __func__
, objname
);
904 acpiphp_check_bridge(bridge
);
905 acpi_walk_namespace(ACPI_TYPE_DEVICE
, handle
,
906 ACPI_UINT32_MAX
, check_sub_bridges
,
909 acpiphp_enable_slot(func
->slot
);
913 case ACPI_NOTIFY_DEVICE_CHECK
:
915 dbg("%s: Device check notify on %s\n", __func__
, objname
);
917 acpiphp_check_bridge(bridge
);
919 acpiphp_check_bridge(func
->parent
);
923 case ACPI_NOTIFY_EJECT_REQUEST
:
924 /* request device eject */
925 dbg("%s: Device eject notify on %s\n", __func__
, objname
);
926 acpiphp_disable_and_eject_slot(func
->slot
);
934 static void hotplug_event_work(struct work_struct
*work
)
936 struct acpiphp_context
*context
;
937 struct acpi_hp_work
*hp_work
;
939 hp_work
= container_of(work
, struct acpi_hp_work
, work
);
940 context
= hp_work
->context
;
941 acpi_scan_lock_acquire();
943 hotplug_event(hp_work
->handle
, hp_work
->type
, context
);
945 acpi_scan_lock_release();
946 kfree(hp_work
); /* allocated in handle_hotplug_event() */
947 put_bridge(context
->func
.parent
);
951 * handle_hotplug_event - handle ACPI hotplug event
952 * @handle: Notify()'ed acpi_handle
954 * @data: pointer to acpiphp_context structure
956 * Handles ACPI event notification on slots.
958 static void handle_hotplug_event(acpi_handle handle
, u32 type
, void *data
)
960 struct acpiphp_context
*context
;
963 case ACPI_NOTIFY_BUS_CHECK
:
964 case ACPI_NOTIFY_DEVICE_CHECK
:
965 case ACPI_NOTIFY_EJECT_REQUEST
:
968 case ACPI_NOTIFY_DEVICE_WAKE
:
971 case ACPI_NOTIFY_FREQUENCY_MISMATCH
:
972 acpi_handle_err(handle
, "Device cannot be configured due "
973 "to a frequency mismatch\n");
976 case ACPI_NOTIFY_BUS_MODE_MISMATCH
:
977 acpi_handle_err(handle
, "Device cannot be configured due "
978 "to a bus mode mismatch\n");
981 case ACPI_NOTIFY_POWER_FAULT
:
982 acpi_handle_err(handle
, "Device has suffered a power fault\n");
986 acpi_handle_warn(handle
, "Unsupported event type 0x%x\n", type
);
990 mutex_lock(&acpiphp_context_lock
);
991 context
= acpiphp_get_context(handle
);
993 get_bridge(context
->func
.parent
);
994 acpiphp_put_context(context
);
995 alloc_acpi_hp_work(handle
, type
, context
, hotplug_event_work
);
997 mutex_unlock(&acpiphp_context_lock
);
1001 * Create hotplug slots for the PCI bus.
1002 * It should always return 0 to avoid skipping following notifiers.
1004 void acpiphp_enumerate_slots(struct pci_bus
*bus
)
1006 struct acpiphp_bridge
*bridge
;
1010 if (acpiphp_disabled
)
1013 handle
= ACPI_HANDLE(bus
->bridge
);
1017 bridge
= kzalloc(sizeof(struct acpiphp_bridge
), GFP_KERNEL
);
1019 acpi_handle_err(handle
, "No memory for bridge object\n");
1023 INIT_LIST_HEAD(&bridge
->slots
);
1024 kref_init(&bridge
->ref
);
1025 bridge
->pci_dev
= pci_dev_get(bus
->self
);
1026 bridge
->pci_bus
= bus
;
1029 * Grab a ref to the subordinate PCI bus in case the bus is
1030 * removed via PCI core logical hotplug. The ref pins the bus
1031 * (which we access during module unload).
1033 get_device(&bus
->dev
);
1035 if (!pci_is_root_bus(bridge
->pci_bus
)) {
1036 struct acpiphp_context
*context
;
1039 * This bridge should have been registered as a hotplug function
1040 * under its parent, so the context has to be there. If not, we
1043 mutex_lock(&acpiphp_context_lock
);
1044 context
= acpiphp_get_context(handle
);
1045 if (WARN_ON(!context
)) {
1046 mutex_unlock(&acpiphp_context_lock
);
1047 put_device(&bus
->dev
);
1051 bridge
->context
= context
;
1052 context
->bridge
= bridge
;
1053 /* Get a reference to the parent bridge. */
1054 get_bridge(context
->func
.parent
);
1055 mutex_unlock(&acpiphp_context_lock
);
1058 /* must be added to the list prior to calling register_slot */
1059 mutex_lock(&bridge_mutex
);
1060 list_add(&bridge
->list
, &bridge_list
);
1061 mutex_unlock(&bridge_mutex
);
1063 /* register all slot objects under this bridge */
1064 status
= acpi_walk_namespace(ACPI_TYPE_DEVICE
, handle
, 1,
1065 register_slot
, NULL
, bridge
, NULL
);
1066 if (ACPI_FAILURE(status
)) {
1067 acpi_handle_err(handle
, "failed to register slots\n");
1068 cleanup_bridge(bridge
);
1073 /* Destroy hotplug slots associated with the PCI bus */
1074 void acpiphp_remove_slots(struct pci_bus
*bus
)
1076 struct acpiphp_bridge
*bridge
, *tmp
;
1078 if (acpiphp_disabled
)
1081 list_for_each_entry_safe(bridge
, tmp
, &bridge_list
, list
)
1082 if (bridge
->pci_bus
== bus
) {
1083 cleanup_bridge(bridge
);
1090 * acpiphp_enable_slot - power on slot
1091 * @slot: ACPI PHP slot
1093 int acpiphp_enable_slot(struct acpiphp_slot
*slot
)
1097 mutex_lock(&slot
->crit_sect
);
1099 /* wake up all functions */
1100 retval
= power_on_slot(slot
);
1104 if (get_slot_status(slot
) == ACPI_STA_ALL
) {
1105 /* configure all functions */
1106 retval
= enable_device(slot
);
1108 power_off_slot(slot
);
1110 dbg("%s: Slot status is not ACPI_STA_ALL\n", __func__
);
1111 power_off_slot(slot
);
1115 mutex_unlock(&slot
->crit_sect
);
1120 * acpiphp_disable_and_eject_slot - power off and eject slot
1121 * @slot: ACPI PHP slot
1123 int acpiphp_disable_and_eject_slot(struct acpiphp_slot
*slot
)
1125 struct acpiphp_func
*func
;
1128 mutex_lock(&slot
->crit_sect
);
1130 /* unconfigure all functions */
1131 retval
= disable_device(slot
);
1135 /* power off all functions */
1136 retval
= power_off_slot(slot
);
1140 list_for_each_entry(func
, &slot
->funcs
, sibling
)
1141 if (func
->flags
& FUNC_HAS_EJ0
) {
1142 acpi_handle handle
= func_to_handle(func
);
1144 if (ACPI_FAILURE(acpi_evaluate_ej0(handle
)))
1145 acpi_handle_err(handle
, "_EJ0 failed\n");
1151 mutex_unlock(&slot
->crit_sect
);
1160 u8
acpiphp_get_power_status(struct acpiphp_slot
*slot
)
1162 return (slot
->flags
& SLOT_POWEREDON
);
1170 u8
acpiphp_get_latch_status(struct acpiphp_slot
*slot
)
1174 sta
= get_slot_status(slot
);
1176 return (sta
& ACPI_STA_DEVICE_UI
) ? 0 : 1;
1181 * adapter presence : 1
1184 u8
acpiphp_get_adapter_status(struct acpiphp_slot
*slot
)
1188 sta
= get_slot_status(slot
);
1190 return (sta
== 0) ? 0 : 1;