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/module.h>
46 #include <linux/kernel.h>
47 #include <linux/pci.h>
48 #include <linux/pci_hotplug.h>
49 #include <linux/pci-acpi.h>
50 #include <linux/pm_runtime.h>
51 #include <linux/mutex.h>
52 #include <linux/slab.h>
53 #include <linux/acpi.h>
58 static LIST_HEAD(bridge_list
);
59 static DEFINE_MUTEX(bridge_mutex
);
61 static int acpiphp_hotplug_notify(struct acpi_device
*adev
, u32 type
);
62 static void acpiphp_post_dock_fixup(struct acpi_device
*adev
);
63 static void acpiphp_sanitize_bus(struct pci_bus
*bus
);
64 static void hotplug_event(u32 type
, struct acpiphp_context
*context
);
65 static void free_bridge(struct kref
*kref
);
68 * acpiphp_init_context - Create hotplug context and grab a reference to it.
69 * @adev: ACPI device object to create the context for.
71 * Call under acpi_hp_context_lock.
73 static struct acpiphp_context
*acpiphp_init_context(struct acpi_device
*adev
)
75 struct acpiphp_context
*context
;
77 context
= kzalloc(sizeof(*context
), GFP_KERNEL
);
81 context
->refcount
= 1;
82 context
->hp
.notify
= acpiphp_hotplug_notify
;
83 context
->hp
.fixup
= acpiphp_post_dock_fixup
;
84 acpi_set_hp_context(adev
, &context
->hp
);
89 * acpiphp_get_context - Get hotplug context and grab a reference to it.
90 * @adev: ACPI device object to get the context for.
92 * Call under acpi_hp_context_lock.
94 static struct acpiphp_context
*acpiphp_get_context(struct acpi_device
*adev
)
96 struct acpiphp_context
*context
;
101 context
= to_acpiphp_context(adev
->hp
);
107 * acpiphp_put_context - Drop a reference to ACPI hotplug context.
108 * @context: ACPI hotplug context to drop a reference to.
110 * The context object is removed if there are no more references to it.
112 * Call under acpi_hp_context_lock.
114 static void acpiphp_put_context(struct acpiphp_context
*context
)
116 if (--context
->refcount
)
119 WARN_ON(context
->bridge
);
120 context
->hp
.self
->hp
= NULL
;
124 static inline void get_bridge(struct acpiphp_bridge
*bridge
)
126 kref_get(&bridge
->ref
);
129 static inline void put_bridge(struct acpiphp_bridge
*bridge
)
131 kref_put(&bridge
->ref
, free_bridge
);
134 static struct acpiphp_context
*acpiphp_grab_context(struct acpi_device
*adev
)
136 struct acpiphp_context
*context
;
138 acpi_lock_hp_context();
139 context
= acpiphp_get_context(adev
);
140 if (!context
|| context
->func
.parent
->is_going_away
) {
141 acpi_unlock_hp_context();
144 get_bridge(context
->func
.parent
);
145 acpiphp_put_context(context
);
146 acpi_unlock_hp_context();
150 static void acpiphp_let_context_go(struct acpiphp_context
*context
)
152 put_bridge(context
->func
.parent
);
155 static void free_bridge(struct kref
*kref
)
157 struct acpiphp_context
*context
;
158 struct acpiphp_bridge
*bridge
;
159 struct acpiphp_slot
*slot
, *next
;
160 struct acpiphp_func
*func
, *tmp
;
162 acpi_lock_hp_context();
164 bridge
= container_of(kref
, struct acpiphp_bridge
, ref
);
166 list_for_each_entry_safe(slot
, next
, &bridge
->slots
, node
) {
167 list_for_each_entry_safe(func
, tmp
, &slot
->funcs
, sibling
)
168 acpiphp_put_context(func_to_context(func
));
173 context
= bridge
->context
;
174 /* Root bridges will not have hotplug context. */
176 /* Release the reference taken by acpiphp_enumerate_slots(). */
177 put_bridge(context
->func
.parent
);
178 context
->bridge
= NULL
;
179 acpiphp_put_context(context
);
182 put_device(&bridge
->pci_bus
->dev
);
183 pci_dev_put(bridge
->pci_dev
);
186 acpi_unlock_hp_context();
190 * acpiphp_post_dock_fixup - Post-dock fixups for PCI devices.
191 * @adev: ACPI device object corresponding to a PCI device.
193 * TBD - figure out a way to only call fixups for systems that require them.
195 static void acpiphp_post_dock_fixup(struct acpi_device
*adev
)
197 struct acpiphp_context
*context
= acpiphp_grab_context(adev
);
204 bus
= context
->func
.slot
->bus
;
208 /* fixup bad _DCK function that rewrites
209 * secondary bridge on slot
211 pci_read_config_dword(bus
->self
, PCI_PRIMARY_BUS
, &buses
);
213 if (((buses
>> 8) & 0xff) != bus
->busn_res
.start
) {
214 buses
= (buses
& 0xff000000)
215 | ((unsigned int)(bus
->primary
) << 0)
216 | ((unsigned int)(bus
->busn_res
.start
) << 8)
217 | ((unsigned int)(bus
->busn_res
.end
) << 16);
218 pci_write_config_dword(bus
->self
, PCI_PRIMARY_BUS
, buses
);
222 acpiphp_let_context_go(context
);
225 /* Check whether the PCI device is managed by native PCIe hotplug driver */
226 static bool device_is_managed_by_native_pciehp(struct pci_dev
*pdev
)
230 struct acpi_pci_root
*root
;
232 /* Check whether the PCIe port supports native PCIe hotplug */
233 if (pcie_capability_read_dword(pdev
, PCI_EXP_SLTCAP
, ®32
))
235 if (!(reg32
& PCI_EXP_SLTCAP_HPC
))
239 * Check whether native PCIe hotplug has been enabled for
240 * this PCIe hierarchy.
242 tmp
= acpi_find_root_bridge_handle(pdev
);
245 root
= acpi_pci_find_root(tmp
);
248 if (!(root
->osc_control_set
& OSC_PCI_EXPRESS_NATIVE_HP_CONTROL
))
255 * acpiphp_add_context - Add ACPIPHP context to an ACPI device object.
256 * @handle: ACPI handle of the object to add a context to.
258 * @data: The object's parent ACPIPHP bridge.
261 static acpi_status
acpiphp_add_context(acpi_handle handle
, u32 lvl
, void *data
,
264 struct acpiphp_bridge
*bridge
= data
;
265 struct acpiphp_context
*context
;
266 struct acpi_device
*adev
;
267 struct acpiphp_slot
*slot
;
268 struct acpiphp_func
*newfunc
;
269 acpi_status status
= AE_OK
;
270 unsigned long long adr
;
271 int device
, function
;
272 struct pci_bus
*pbus
= bridge
->pci_bus
;
273 struct pci_dev
*pdev
= bridge
->pci_dev
;
276 status
= acpi_evaluate_integer(handle
, "_ADR", NULL
, &adr
);
277 if (ACPI_FAILURE(status
)) {
278 if (status
!= AE_NOT_FOUND
)
279 acpi_handle_warn(handle
,
280 "can't evaluate _ADR (%#x)\n", status
);
283 if (acpi_bus_get_device(handle
, &adev
))
286 device
= (adr
>> 16) & 0xffff;
287 function
= adr
& 0xffff;
289 acpi_lock_hp_context();
290 context
= acpiphp_init_context(adev
);
292 acpi_unlock_hp_context();
293 acpi_handle_err(handle
, "No hotplug context\n");
296 newfunc
= &context
->func
;
297 newfunc
->function
= function
;
298 newfunc
->parent
= bridge
;
299 acpi_unlock_hp_context();
302 * If this is a dock device, its _EJ0 should be executed by the dock
303 * notify handler after calling _DCK.
305 if (!is_dock_device(adev
) && acpi_has_method(handle
, "_EJ0"))
306 newfunc
->flags
= FUNC_HAS_EJ0
;
308 if (acpi_has_method(handle
, "_STA"))
309 newfunc
->flags
|= FUNC_HAS_STA
;
311 /* search for objects that share the same slot */
312 list_for_each_entry(slot
, &bridge
->slots
, node
)
313 if (slot
->device
== device
)
316 slot
= kzalloc(sizeof(struct acpiphp_slot
), GFP_KERNEL
);
318 acpi_lock_hp_context();
319 acpiphp_put_context(context
);
320 acpi_unlock_hp_context();
324 slot
->bus
= bridge
->pci_bus
;
325 slot
->device
= device
;
326 INIT_LIST_HEAD(&slot
->funcs
);
328 list_add_tail(&slot
->node
, &bridge
->slots
);
331 * Expose slots to user space for functions that have _EJ0 or _RMV or
332 * are located in dock stations. Do not expose them for devices handled
333 * by the native PCIe hotplug (PCIeHP), becuase that code is supposed to
334 * expose slots to user space in those cases.
336 if ((acpi_pci_check_ejectable(pbus
, handle
) || is_dock_device(adev
))
337 && !(pdev
&& device_is_managed_by_native_pciehp(pdev
))) {
338 unsigned long long sun
;
342 status
= acpi_evaluate_integer(handle
, "_SUN", NULL
, &sun
);
343 if (ACPI_FAILURE(status
))
344 sun
= bridge
->nr_slots
;
346 pr_debug("found ACPI PCI Hotplug slot %llu at PCI %04x:%02x:%02x\n",
347 sun
, pci_domain_nr(pbus
), pbus
->number
, device
);
349 retval
= acpiphp_register_hotplug_slot(slot
, sun
);
353 if (retval
== -EBUSY
)
354 pr_warn("Slot %llu already registered by another hotplug driver\n", sun
);
356 pr_warn("acpiphp_register_hotplug_slot failed (err code = 0x%x)\n", retval
);
358 /* Even if the slot registration fails, we can still use it. */
362 newfunc
->slot
= slot
;
363 list_add_tail(&newfunc
->sibling
, &slot
->funcs
);
365 if (pci_bus_read_dev_vendor_id(pbus
, PCI_DEVFN(device
, function
),
367 slot
->flags
|= SLOT_ENABLED
;
372 static void cleanup_bridge(struct acpiphp_bridge
*bridge
)
374 struct acpiphp_slot
*slot
;
375 struct acpiphp_func
*func
;
377 list_for_each_entry(slot
, &bridge
->slots
, node
) {
378 list_for_each_entry(func
, &slot
->funcs
, sibling
) {
379 struct acpi_device
*adev
= func_to_acpi_device(func
);
381 acpi_lock_hp_context();
382 adev
->hp
->notify
= NULL
;
383 adev
->hp
->fixup
= NULL
;
384 acpi_unlock_hp_context();
386 slot
->flags
|= SLOT_IS_GOING_AWAY
;
388 acpiphp_unregister_hotplug_slot(slot
);
391 mutex_lock(&bridge_mutex
);
392 list_del(&bridge
->list
);
393 mutex_unlock(&bridge_mutex
);
395 acpi_lock_hp_context();
396 bridge
->is_going_away
= true;
397 acpi_unlock_hp_context();
401 * acpiphp_max_busnr - return the highest reserved bus number under the given bus.
402 * @bus: bus to start search with
404 static unsigned char acpiphp_max_busnr(struct pci_bus
*bus
)
407 unsigned char max
, n
;
410 * pci_bus_max_busnr will return the highest
411 * reserved busnr for all these children.
412 * that is equivalent to the bus->subordinate
413 * value. We don't want to use the parent's
414 * bus->subordinate value because it could have
417 max
= bus
->busn_res
.start
;
419 list_for_each_entry(tmp
, &bus
->children
, node
) {
420 n
= pci_bus_max_busnr(tmp
);
427 static void acpiphp_set_acpi_region(struct acpiphp_slot
*slot
)
429 struct acpiphp_func
*func
;
430 union acpi_object params
[2];
431 struct acpi_object_list arg_list
;
433 list_for_each_entry(func
, &slot
->funcs
, sibling
) {
435 arg_list
.pointer
= params
;
436 params
[0].type
= ACPI_TYPE_INTEGER
;
437 params
[0].integer
.value
= ACPI_ADR_SPACE_PCI_CONFIG
;
438 params
[1].type
= ACPI_TYPE_INTEGER
;
439 params
[1].integer
.value
= 1;
440 /* _REG is optional, we don't care about if there is failure */
441 acpi_evaluate_object(func_to_handle(func
), "_REG", &arg_list
,
446 static void check_hotplug_bridge(struct acpiphp_slot
*slot
, struct pci_dev
*dev
)
448 struct acpiphp_func
*func
;
450 /* quirk, or pcie could set it already */
451 if (dev
->is_hotplug_bridge
)
454 list_for_each_entry(func
, &slot
->funcs
, sibling
) {
455 if (PCI_FUNC(dev
->devfn
) == func
->function
) {
456 dev
->is_hotplug_bridge
= 1;
462 static int acpiphp_rescan_slot(struct acpiphp_slot
*slot
)
464 struct acpiphp_func
*func
;
466 list_for_each_entry(func
, &slot
->funcs
, sibling
) {
467 struct acpi_device
*adev
= func_to_acpi_device(func
);
469 acpi_bus_scan(adev
->handle
);
470 if (acpi_device_enumerated(adev
))
471 acpi_device_set_power(adev
, ACPI_STATE_D0
);
473 return pci_scan_slot(slot
->bus
, PCI_DEVFN(slot
->device
, 0));
477 * enable_slot - enable, configure a slot
478 * @slot: slot to be enabled
480 * This function should be called per *physical slot*,
481 * not per each slot object in ACPI namespace.
483 static void enable_slot(struct acpiphp_slot
*slot
)
486 struct pci_bus
*bus
= slot
->bus
;
487 struct acpiphp_func
*func
;
491 acpiphp_rescan_slot(slot
);
492 max
= acpiphp_max_busnr(bus
);
493 for (pass
= 0; pass
< 2; pass
++) {
494 list_for_each_entry(dev
, &bus
->devices
, bus_list
) {
495 if (PCI_SLOT(dev
->devfn
) != slot
->device
)
498 if (pci_is_bridge(dev
)) {
499 max
= pci_scan_bridge(bus
, dev
, max
, pass
);
500 if (pass
&& dev
->subordinate
) {
501 check_hotplug_bridge(slot
, dev
);
502 pcibios_resource_survey_bus(dev
->subordinate
);
503 __pci_bus_size_bridges(dev
->subordinate
,
509 __pci_bus_assign_resources(bus
, &add_list
, NULL
);
511 acpiphp_sanitize_bus(bus
);
512 pcie_bus_configure_settings(bus
);
513 acpiphp_set_acpi_region(slot
);
515 list_for_each_entry(dev
, &bus
->devices
, bus_list
) {
516 /* Assume that newly added devices are powered on already. */
518 dev
->current_state
= PCI_D0
;
521 pci_bus_add_devices(bus
);
523 slot
->flags
|= SLOT_ENABLED
;
524 list_for_each_entry(func
, &slot
->funcs
, sibling
) {
525 dev
= pci_get_slot(bus
, PCI_DEVFN(slot
->device
,
528 /* Do not set SLOT_ENABLED flag if some funcs
530 slot
->flags
&= (~SLOT_ENABLED
);
537 * disable_slot - disable a slot
538 * @slot: ACPI PHP slot
540 static void disable_slot(struct acpiphp_slot
*slot
)
542 struct pci_bus
*bus
= slot
->bus
;
543 struct pci_dev
*dev
, *prev
;
544 struct acpiphp_func
*func
;
547 * enable_slot() enumerates all functions in this device via
548 * pci_scan_slot(), whether they have associated ACPI hotplug
549 * methods (_EJ0, etc.) or not. Therefore, we remove all functions
552 list_for_each_entry_safe_reverse(dev
, prev
, &bus
->devices
, bus_list
)
553 if (PCI_SLOT(dev
->devfn
) == slot
->device
)
554 pci_stop_and_remove_bus_device(dev
);
556 list_for_each_entry(func
, &slot
->funcs
, sibling
)
557 acpi_bus_trim(func_to_acpi_device(func
));
559 slot
->flags
&= (~SLOT_ENABLED
);
562 static bool slot_no_hotplug(struct acpiphp_slot
*slot
)
564 struct pci_bus
*bus
= slot
->bus
;
567 list_for_each_entry(dev
, &bus
->devices
, bus_list
) {
568 if (PCI_SLOT(dev
->devfn
) == slot
->device
&& dev
->ignore_hotplug
)
575 * get_slot_status - get ACPI slot status
576 * @slot: ACPI PHP slot
578 * If a slot has _STA for each function and if any one of them
579 * returned non-zero status, return it.
581 * If a slot doesn't have _STA and if any one of its functions'
582 * configuration space is configured, return 0x0f as a _STA.
584 * Otherwise return 0.
586 static unsigned int get_slot_status(struct acpiphp_slot
*slot
)
588 unsigned long long sta
= 0;
589 struct acpiphp_func
*func
;
591 list_for_each_entry(func
, &slot
->funcs
, sibling
) {
592 if (func
->flags
& FUNC_HAS_STA
) {
595 status
= acpi_evaluate_integer(func_to_handle(func
),
597 if (ACPI_SUCCESS(status
) && sta
)
602 pci_bus_read_config_dword(slot
->bus
,
603 PCI_DEVFN(slot
->device
,
605 PCI_VENDOR_ID
, &dvid
);
606 if (dvid
!= 0xffffffff) {
613 return (unsigned int)sta
;
616 static inline bool device_status_valid(unsigned int sta
)
619 * ACPI spec says that _STA may return bit 0 clear with bit 3 set
620 * if the device is valid but does not require a device driver to be
621 * loaded (Section 6.3.7 of ACPI 5.0A).
623 unsigned int mask
= ACPI_STA_DEVICE_ENABLED
| ACPI_STA_DEVICE_FUNCTIONING
;
624 return (sta
& mask
) == mask
;
628 * trim_stale_devices - remove PCI devices that are not responding.
629 * @dev: PCI device to start walking the hierarchy from.
631 static void trim_stale_devices(struct pci_dev
*dev
)
633 struct acpi_device
*adev
= ACPI_COMPANION(&dev
->dev
);
634 struct pci_bus
*bus
= dev
->subordinate
;
635 bool alive
= dev
->ignore_hotplug
;
639 unsigned long long sta
;
641 status
= acpi_evaluate_integer(adev
->handle
, "_STA", NULL
, &sta
);
642 alive
= alive
|| (ACPI_SUCCESS(status
) && device_status_valid(sta
));
645 alive
= pci_device_is_present(dev
);
648 pci_stop_and_remove_bus_device(dev
);
652 struct pci_dev
*child
, *tmp
;
654 /* The device is a bridge. so check the bus below it. */
655 pm_runtime_get_sync(&dev
->dev
);
656 list_for_each_entry_safe_reverse(child
, tmp
, &bus
->devices
, bus_list
)
657 trim_stale_devices(child
);
659 pm_runtime_put(&dev
->dev
);
664 * acpiphp_check_bridge - re-enumerate devices
665 * @bridge: where to begin re-enumeration
667 * Iterate over all slots under this bridge and make sure that if a
668 * card is present they are enabled, and if not they are disabled.
670 static void acpiphp_check_bridge(struct acpiphp_bridge
*bridge
)
672 struct acpiphp_slot
*slot
;
674 /* Bail out if the bridge is going away. */
675 if (bridge
->is_going_away
)
678 list_for_each_entry(slot
, &bridge
->slots
, node
) {
679 struct pci_bus
*bus
= slot
->bus
;
680 struct pci_dev
*dev
, *tmp
;
682 if (slot_no_hotplug(slot
)) {
684 } else if (device_status_valid(get_slot_status(slot
))) {
685 /* remove stale devices if any */
686 list_for_each_entry_safe_reverse(dev
, tmp
,
687 &bus
->devices
, bus_list
)
688 if (PCI_SLOT(dev
->devfn
) == slot
->device
)
689 trim_stale_devices(dev
);
691 /* configure all functions */
700 * Remove devices for which we could not assign resources, call
701 * arch specific code to fix-up the bus
703 static void acpiphp_sanitize_bus(struct pci_bus
*bus
)
705 struct pci_dev
*dev
, *tmp
;
707 unsigned long type_mask
= IORESOURCE_IO
| IORESOURCE_MEM
;
709 list_for_each_entry_safe_reverse(dev
, tmp
, &bus
->devices
, bus_list
) {
710 for (i
= 0; i
< PCI_BRIDGE_RESOURCES
; i
++) {
711 struct resource
*res
= &dev
->resource
[i
];
712 if ((res
->flags
& type_mask
) && !res
->start
&&
714 /* Could not assign a required resources
715 * for this device, remove it */
716 pci_stop_and_remove_bus_device(dev
);
724 * ACPI event handlers
727 void acpiphp_check_host_bridge(struct acpi_device
*adev
)
729 struct acpiphp_bridge
*bridge
= NULL
;
731 acpi_lock_hp_context();
733 bridge
= to_acpiphp_root_context(adev
->hp
)->root_bridge
;
737 acpi_unlock_hp_context();
739 pci_lock_rescan_remove();
741 acpiphp_check_bridge(bridge
);
743 pci_unlock_rescan_remove();
748 static int acpiphp_disable_and_eject_slot(struct acpiphp_slot
*slot
);
750 static void hotplug_event(u32 type
, struct acpiphp_context
*context
)
752 acpi_handle handle
= context
->hp
.self
->handle
;
753 struct acpiphp_func
*func
= &context
->func
;
754 struct acpiphp_slot
*slot
= func
->slot
;
755 struct acpiphp_bridge
*bridge
;
757 acpi_lock_hp_context();
758 bridge
= context
->bridge
;
762 acpi_unlock_hp_context();
764 pci_lock_rescan_remove();
767 case ACPI_NOTIFY_BUS_CHECK
:
768 /* bus re-enumerate */
769 acpi_handle_debug(handle
, "Bus check in %s()\n", __func__
);
771 acpiphp_check_bridge(bridge
);
772 else if (!(slot
->flags
& SLOT_IS_GOING_AWAY
))
777 case ACPI_NOTIFY_DEVICE_CHECK
:
779 acpi_handle_debug(handle
, "Device check in %s()\n", __func__
);
781 acpiphp_check_bridge(bridge
);
782 } else if (!(slot
->flags
& SLOT_IS_GOING_AWAY
)) {
784 * Check if anything has changed in the slot and rescan
785 * from the parent if that's the case.
787 if (acpiphp_rescan_slot(slot
))
788 acpiphp_check_bridge(func
->parent
);
792 case ACPI_NOTIFY_EJECT_REQUEST
:
793 /* request device eject */
794 acpi_handle_debug(handle
, "Eject request in %s()\n", __func__
);
795 acpiphp_disable_and_eject_slot(slot
);
799 pci_unlock_rescan_remove();
804 static int acpiphp_hotplug_notify(struct acpi_device
*adev
, u32 type
)
806 struct acpiphp_context
*context
;
808 context
= acpiphp_grab_context(adev
);
812 hotplug_event(type
, context
);
813 acpiphp_let_context_go(context
);
818 * acpiphp_enumerate_slots - Enumerate PCI slots for a given bus.
819 * @bus: PCI bus to enumerate the slots for.
821 * A "slot" is an object associated with a PCI device number. All functions
822 * (PCI devices) with the same bus and device number belong to the same slot.
824 void acpiphp_enumerate_slots(struct pci_bus
*bus
)
826 struct acpiphp_bridge
*bridge
;
827 struct acpi_device
*adev
;
831 if (acpiphp_disabled
)
834 adev
= ACPI_COMPANION(bus
->bridge
);
838 handle
= adev
->handle
;
839 bridge
= kzalloc(sizeof(struct acpiphp_bridge
), GFP_KERNEL
);
841 acpi_handle_err(handle
, "No memory for bridge object\n");
845 INIT_LIST_HEAD(&bridge
->slots
);
846 kref_init(&bridge
->ref
);
847 bridge
->pci_dev
= pci_dev_get(bus
->self
);
848 bridge
->pci_bus
= bus
;
851 * Grab a ref to the subordinate PCI bus in case the bus is
852 * removed via PCI core logical hotplug. The ref pins the bus
853 * (which we access during module unload).
855 get_device(&bus
->dev
);
857 acpi_lock_hp_context();
858 if (pci_is_root_bus(bridge
->pci_bus
)) {
859 struct acpiphp_root_context
*root_context
;
861 root_context
= kzalloc(sizeof(*root_context
), GFP_KERNEL
);
865 root_context
->root_bridge
= bridge
;
866 acpi_set_hp_context(adev
, &root_context
->hp
);
868 struct acpiphp_context
*context
;
871 * This bridge should have been registered as a hotplug function
872 * under its parent, so the context should be there, unless the
873 * parent is going to be handled by pciehp, in which case this
874 * bridge is not interesting to us either.
876 context
= acpiphp_get_context(adev
);
880 bridge
->context
= context
;
881 context
->bridge
= bridge
;
882 /* Get a reference to the parent bridge. */
883 get_bridge(context
->func
.parent
);
885 acpi_unlock_hp_context();
887 /* Must be added to the list prior to calling acpiphp_add_context(). */
888 mutex_lock(&bridge_mutex
);
889 list_add(&bridge
->list
, &bridge_list
);
890 mutex_unlock(&bridge_mutex
);
892 /* register all slot objects under this bridge */
893 status
= acpi_walk_namespace(ACPI_TYPE_DEVICE
, handle
, 1,
894 acpiphp_add_context
, NULL
, bridge
, NULL
);
895 if (ACPI_FAILURE(status
)) {
896 acpi_handle_err(handle
, "failed to register slots\n");
897 cleanup_bridge(bridge
);
903 acpi_unlock_hp_context();
904 put_device(&bus
->dev
);
905 pci_dev_put(bridge
->pci_dev
);
909 static void acpiphp_drop_bridge(struct acpiphp_bridge
*bridge
)
911 if (pci_is_root_bus(bridge
->pci_bus
)) {
912 struct acpiphp_root_context
*root_context
;
913 struct acpi_device
*adev
;
915 acpi_lock_hp_context();
916 adev
= ACPI_COMPANION(bridge
->pci_bus
->bridge
);
917 root_context
= to_acpiphp_root_context(adev
->hp
);
919 acpi_unlock_hp_context();
922 cleanup_bridge(bridge
);
927 * acpiphp_remove_slots - Remove slot objects associated with a given bus.
928 * @bus: PCI bus to remove the slot objects for.
930 void acpiphp_remove_slots(struct pci_bus
*bus
)
932 struct acpiphp_bridge
*bridge
;
934 if (acpiphp_disabled
)
937 mutex_lock(&bridge_mutex
);
938 list_for_each_entry(bridge
, &bridge_list
, list
)
939 if (bridge
->pci_bus
== bus
) {
940 mutex_unlock(&bridge_mutex
);
941 acpiphp_drop_bridge(bridge
);
945 mutex_unlock(&bridge_mutex
);
949 * acpiphp_enable_slot - power on slot
950 * @slot: ACPI PHP slot
952 int acpiphp_enable_slot(struct acpiphp_slot
*slot
)
954 pci_lock_rescan_remove();
956 if (slot
->flags
& SLOT_IS_GOING_AWAY
) {
957 pci_unlock_rescan_remove();
961 /* configure all functions */
962 if (!(slot
->flags
& SLOT_ENABLED
))
965 pci_unlock_rescan_remove();
970 * acpiphp_disable_and_eject_slot - power off and eject slot
971 * @slot: ACPI PHP slot
973 static int acpiphp_disable_and_eject_slot(struct acpiphp_slot
*slot
)
975 struct acpiphp_func
*func
;
977 if (slot
->flags
& SLOT_IS_GOING_AWAY
)
980 /* unconfigure all functions */
983 list_for_each_entry(func
, &slot
->funcs
, sibling
)
984 if (func
->flags
& FUNC_HAS_EJ0
) {
985 acpi_handle handle
= func_to_handle(func
);
987 if (ACPI_FAILURE(acpi_evaluate_ej0(handle
)))
988 acpi_handle_err(handle
, "_EJ0 failed\n");
996 int acpiphp_disable_slot(struct acpiphp_slot
*slot
)
1001 * Acquire acpi_scan_lock to ensure that the execution of _EJ0 in
1002 * acpiphp_disable_and_eject_slot() will be synchronized properly.
1004 acpi_scan_lock_acquire();
1005 pci_lock_rescan_remove();
1006 ret
= acpiphp_disable_and_eject_slot(slot
);
1007 pci_unlock_rescan_remove();
1008 acpi_scan_lock_release();
1016 u8
acpiphp_get_power_status(struct acpiphp_slot
*slot
)
1018 return (slot
->flags
& SLOT_ENABLED
);
1025 u8
acpiphp_get_latch_status(struct acpiphp_slot
*slot
)
1027 return !(get_slot_status(slot
) & ACPI_STA_DEVICE_UI
);
1031 * adapter presence : 1
1034 u8
acpiphp_get_adapter_status(struct acpiphp_slot
*slot
)
1036 return !!get_slot_status(slot
);