fix a kmap leak in virtio_console
[linux/fpc-iii.git] / drivers / pci / hotplug / acpiphp_glue.c
blobcd929aed3613314068ed7a4baf2bb6e5c6cb9f1f
1 /*
2 * ACPI PCI HotPlug glue functions to ACPI CA subsystem
4 * Copyright (C) 2002,2003 Takayoshi Kochi (t-kochi@bq.jp.nec.com)
5 * Copyright (C) 2002 Hiroshi Aono (h-aono@ap.jp.nec.com)
6 * Copyright (C) 2002,2003 NEC Corporation
7 * Copyright (C) 2003-2005 Matthew Wilcox (matthew.wilcox@hp.com)
8 * Copyright (C) 2003-2005 Hewlett Packard
9 * Copyright (C) 2005 Rajesh Shah (rajesh.shah@intel.com)
10 * Copyright (C) 2005 Intel Corporation
12 * All rights reserved.
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or (at
17 * your option) any later version.
19 * This program is distributed in the hope that it will be useful, but
20 * WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
22 * NON INFRINGEMENT. See the GNU General Public License for more
23 * details.
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, write to the Free Software
27 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
29 * Send feedback to <kristen.c.accardi@intel.com>
34 * Lifetime rules for pci_dev:
35 * - The one in acpiphp_bridge has its refcount elevated by pci_get_slot()
36 * when the bridge is scanned and it loses a refcount when the bridge
37 * is removed.
38 * - When a P2P bridge is present, we elevate the refcount on the subordinate
39 * bus. It loses the refcount when the the driver unloads.
42 #define pr_fmt(fmt) "acpiphp_glue: " fmt
44 #include <linux/init.h>
45 #include <linux/module.h>
47 #include <linux/kernel.h>
48 #include <linux/pci.h>
49 #include <linux/pci_hotplug.h>
50 #include <linux/pci-acpi.h>
51 #include <linux/pm_runtime.h>
52 #include <linux/mutex.h>
53 #include <linux/slab.h>
54 #include <linux/acpi.h>
56 #include "../pci.h"
57 #include "acpiphp.h"
59 static LIST_HEAD(bridge_list);
60 static DEFINE_MUTEX(bridge_mutex);
61 static DEFINE_MUTEX(acpiphp_context_lock);
63 static void handle_hotplug_event(acpi_handle handle, u32 type, void *data);
64 static void acpiphp_sanitize_bus(struct pci_bus *bus);
65 static void acpiphp_set_hpp_values(struct pci_bus *bus);
66 static void hotplug_event(acpi_handle handle, u32 type, void *data);
67 static void free_bridge(struct kref *kref);
69 static void acpiphp_context_handler(acpi_handle handle, void *context)
71 /* Intentionally empty. */
74 /**
75 * acpiphp_init_context - Create hotplug context and grab a reference to it.
76 * @handle: ACPI object handle to create the context for.
78 * Call under acpiphp_context_lock.
80 static struct acpiphp_context *acpiphp_init_context(acpi_handle handle)
82 struct acpiphp_context *context;
83 acpi_status status;
85 context = kzalloc(sizeof(*context), GFP_KERNEL);
86 if (!context)
87 return NULL;
89 context->handle = handle;
90 context->refcount = 1;
91 status = acpi_attach_data(handle, acpiphp_context_handler, context);
92 if (ACPI_FAILURE(status)) {
93 kfree(context);
94 return NULL;
96 return context;
99 /**
100 * acpiphp_get_context - Get hotplug context and grab a reference to it.
101 * @handle: ACPI object handle to get the context for.
103 * Call under acpiphp_context_lock.
105 static struct acpiphp_context *acpiphp_get_context(acpi_handle handle)
107 struct acpiphp_context *context = NULL;
108 acpi_status status;
109 void *data;
111 status = acpi_get_data(handle, acpiphp_context_handler, &data);
112 if (ACPI_SUCCESS(status)) {
113 context = data;
114 context->refcount++;
116 return context;
120 * acpiphp_put_context - Drop a reference to ACPI hotplug context.
121 * @handle: ACPI object handle to put the context for.
123 * The context object is removed if there are no more references to it.
125 * Call under acpiphp_context_lock.
127 static void acpiphp_put_context(struct acpiphp_context *context)
129 if (--context->refcount)
130 return;
132 WARN_ON(context->bridge);
133 acpi_detach_data(context->handle, acpiphp_context_handler);
134 kfree(context);
137 static inline void get_bridge(struct acpiphp_bridge *bridge)
139 kref_get(&bridge->ref);
142 static inline void put_bridge(struct acpiphp_bridge *bridge)
144 kref_put(&bridge->ref, free_bridge);
147 static void free_bridge(struct kref *kref)
149 struct acpiphp_context *context;
150 struct acpiphp_bridge *bridge;
151 struct acpiphp_slot *slot, *next;
152 struct acpiphp_func *func, *tmp;
154 mutex_lock(&acpiphp_context_lock);
156 bridge = container_of(kref, struct acpiphp_bridge, ref);
158 list_for_each_entry_safe(slot, next, &bridge->slots, node) {
159 list_for_each_entry_safe(func, tmp, &slot->funcs, sibling)
160 acpiphp_put_context(func_to_context(func));
162 kfree(slot);
165 context = bridge->context;
166 /* Root bridges will not have hotplug context. */
167 if (context) {
168 /* Release the reference taken by acpiphp_enumerate_slots(). */
169 put_bridge(context->func.parent);
170 context->bridge = NULL;
171 acpiphp_put_context(context);
174 put_device(&bridge->pci_bus->dev);
175 pci_dev_put(bridge->pci_dev);
176 kfree(bridge);
178 mutex_unlock(&acpiphp_context_lock);
182 * the _DCK method can do funny things... and sometimes not
183 * hah-hah funny.
185 * TBD - figure out a way to only call fixups for
186 * systems that require them.
188 static void post_dock_fixups(acpi_handle not_used, u32 event, void *data)
190 struct acpiphp_context *context = data;
191 struct pci_bus *bus = context->func.slot->bus;
192 u32 buses;
194 if (!bus->self)
195 return;
197 /* fixup bad _DCK function that rewrites
198 * secondary bridge on slot
200 pci_read_config_dword(bus->self,
201 PCI_PRIMARY_BUS,
202 &buses);
204 if (((buses >> 8) & 0xff) != bus->busn_res.start) {
205 buses = (buses & 0xff000000)
206 | ((unsigned int)(bus->primary) << 0)
207 | ((unsigned int)(bus->busn_res.start) << 8)
208 | ((unsigned int)(bus->busn_res.end) << 16);
209 pci_write_config_dword(bus->self, PCI_PRIMARY_BUS, buses);
214 static const struct acpi_dock_ops acpiphp_dock_ops = {
215 .fixup = post_dock_fixups,
216 .handler = hotplug_event,
219 /* Check whether the PCI device is managed by native PCIe hotplug driver */
220 static bool device_is_managed_by_native_pciehp(struct pci_dev *pdev)
222 u32 reg32;
223 acpi_handle tmp;
224 struct acpi_pci_root *root;
226 /* Check whether the PCIe port supports native PCIe hotplug */
227 if (pcie_capability_read_dword(pdev, PCI_EXP_SLTCAP, &reg32))
228 return false;
229 if (!(reg32 & PCI_EXP_SLTCAP_HPC))
230 return false;
233 * Check whether native PCIe hotplug has been enabled for
234 * this PCIe hierarchy.
236 tmp = acpi_find_root_bridge_handle(pdev);
237 if (!tmp)
238 return false;
239 root = acpi_pci_find_root(tmp);
240 if (!root)
241 return false;
242 if (!(root->osc_control_set & OSC_PCI_EXPRESS_NATIVE_HP_CONTROL))
243 return false;
245 return true;
248 static void acpiphp_dock_init(void *data)
250 struct acpiphp_context *context = data;
252 get_bridge(context->func.parent);
255 static void acpiphp_dock_release(void *data)
257 struct acpiphp_context *context = data;
259 put_bridge(context->func.parent);
262 /* callback routine to register each ACPI PCI slot object */
263 static acpi_status register_slot(acpi_handle handle, u32 lvl, void *data,
264 void **rv)
266 struct acpiphp_bridge *bridge = data;
267 struct acpiphp_context *context;
268 struct acpiphp_slot *slot;
269 struct acpiphp_func *newfunc;
270 acpi_status status = AE_OK;
271 unsigned long long adr;
272 int device, function;
273 struct pci_bus *pbus = bridge->pci_bus;
274 struct pci_dev *pdev = bridge->pci_dev;
275 u32 val;
277 if (pdev && device_is_managed_by_native_pciehp(pdev))
278 return AE_OK;
280 status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr);
281 if (ACPI_FAILURE(status)) {
282 if (status != AE_NOT_FOUND)
283 acpi_handle_warn(handle,
284 "can't evaluate _ADR (%#x)\n", status);
285 return AE_OK;
288 device = (adr >> 16) & 0xffff;
289 function = adr & 0xffff;
291 mutex_lock(&acpiphp_context_lock);
292 context = acpiphp_init_context(handle);
293 if (!context) {
294 mutex_unlock(&acpiphp_context_lock);
295 acpi_handle_err(handle, "No hotplug context\n");
296 return AE_NOT_EXIST;
298 newfunc = &context->func;
299 newfunc->function = function;
300 newfunc->parent = bridge;
301 mutex_unlock(&acpiphp_context_lock);
303 if (acpi_has_method(handle, "_EJ0"))
304 newfunc->flags = FUNC_HAS_EJ0;
306 if (acpi_has_method(handle, "_STA"))
307 newfunc->flags |= FUNC_HAS_STA;
309 if (acpi_has_method(handle, "_DCK"))
310 newfunc->flags |= FUNC_HAS_DCK;
312 /* search for objects that share the same slot */
313 list_for_each_entry(slot, &bridge->slots, node)
314 if (slot->device == device)
315 goto slot_found;
317 slot = kzalloc(sizeof(struct acpiphp_slot), GFP_KERNEL);
318 if (!slot) {
319 status = AE_NO_MEMORY;
320 goto err;
323 slot->bus = bridge->pci_bus;
324 slot->device = device;
325 INIT_LIST_HEAD(&slot->funcs);
326 mutex_init(&slot->crit_sect);
328 list_add_tail(&slot->node, &bridge->slots);
330 /* Register slots for ejectable functions only. */
331 if (acpi_pci_check_ejectable(pbus, handle) || is_dock_device(handle)) {
332 unsigned long long sun;
333 int retval;
335 bridge->nr_slots++;
336 status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun);
337 if (ACPI_FAILURE(status))
338 sun = bridge->nr_slots;
340 pr_debug("found ACPI PCI Hotplug slot %llu at PCI %04x:%02x:%02x\n",
341 sun, pci_domain_nr(pbus), pbus->number, device);
343 retval = acpiphp_register_hotplug_slot(slot, sun);
344 if (retval) {
345 slot->slot = NULL;
346 bridge->nr_slots--;
347 if (retval == -EBUSY)
348 pr_warn("Slot %llu already registered by another "
349 "hotplug driver\n", sun);
350 else
351 pr_warn("acpiphp_register_hotplug_slot failed "
352 "(err code = 0x%x)\n", retval);
354 /* Even if the slot registration fails, we can still use it. */
357 slot_found:
358 newfunc->slot = slot;
359 list_add_tail(&newfunc->sibling, &slot->funcs);
361 if (pci_bus_read_dev_vendor_id(pbus, PCI_DEVFN(device, function),
362 &val, 60*1000))
363 slot->flags |= SLOT_ENABLED;
365 if (is_dock_device(handle)) {
366 /* we don't want to call this device's _EJ0
367 * because we want the dock notify handler
368 * to call it after it calls _DCK
370 newfunc->flags &= ~FUNC_HAS_EJ0;
371 if (register_hotplug_dock_device(handle,
372 &acpiphp_dock_ops, context,
373 acpiphp_dock_init, acpiphp_dock_release))
374 pr_debug("failed to register dock device\n");
377 /* install notify handler */
378 if (!(newfunc->flags & FUNC_HAS_DCK)) {
379 status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
380 handle_hotplug_event,
381 context);
382 if (ACPI_FAILURE(status))
383 acpi_handle_err(handle,
384 "failed to install notify handler\n");
387 return AE_OK;
389 err:
390 mutex_lock(&acpiphp_context_lock);
391 acpiphp_put_context(context);
392 mutex_unlock(&acpiphp_context_lock);
393 return status;
396 static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle)
398 struct acpiphp_context *context;
399 struct acpiphp_bridge *bridge = NULL;
401 mutex_lock(&acpiphp_context_lock);
402 context = acpiphp_get_context(handle);
403 if (context) {
404 bridge = context->bridge;
405 if (bridge)
406 get_bridge(bridge);
408 acpiphp_put_context(context);
410 mutex_unlock(&acpiphp_context_lock);
411 return bridge;
414 static void cleanup_bridge(struct acpiphp_bridge *bridge)
416 struct acpiphp_slot *slot;
417 struct acpiphp_func *func;
418 acpi_status status;
420 list_for_each_entry(slot, &bridge->slots, node) {
421 list_for_each_entry(func, &slot->funcs, sibling) {
422 acpi_handle handle = func_to_handle(func);
424 if (is_dock_device(handle))
425 unregister_hotplug_dock_device(handle);
427 if (!(func->flags & FUNC_HAS_DCK)) {
428 status = acpi_remove_notify_handler(handle,
429 ACPI_SYSTEM_NOTIFY,
430 handle_hotplug_event);
431 if (ACPI_FAILURE(status))
432 pr_err("failed to remove notify handler\n");
435 slot->flags |= SLOT_IS_GOING_AWAY;
436 if (slot->slot)
437 acpiphp_unregister_hotplug_slot(slot);
440 mutex_lock(&bridge_mutex);
441 list_del(&bridge->list);
442 mutex_unlock(&bridge_mutex);
444 bridge->is_going_away = true;
448 * acpiphp_max_busnr - return the highest reserved bus number under the given bus.
449 * @bus: bus to start search with
451 static unsigned char acpiphp_max_busnr(struct pci_bus *bus)
453 struct list_head *tmp;
454 unsigned char max, n;
457 * pci_bus_max_busnr will return the highest
458 * reserved busnr for all these children.
459 * that is equivalent to the bus->subordinate
460 * value. We don't want to use the parent's
461 * bus->subordinate value because it could have
462 * padding in it.
464 max = bus->busn_res.start;
466 list_for_each(tmp, &bus->children) {
467 n = pci_bus_max_busnr(pci_bus_b(tmp));
468 if (n > max)
469 max = n;
471 return max;
475 * acpiphp_bus_trim - Trim device objects in an ACPI namespace subtree.
476 * @handle: ACPI device object handle to start from.
478 static void acpiphp_bus_trim(acpi_handle handle)
480 struct acpi_device *adev = NULL;
482 acpi_bus_get_device(handle, &adev);
483 if (adev)
484 acpi_bus_trim(adev);
488 * acpiphp_bus_add - Scan ACPI namespace subtree.
489 * @handle: ACPI object handle to start the scan from.
491 static void acpiphp_bus_add(acpi_handle handle)
493 struct acpi_device *adev = NULL;
495 acpi_bus_scan(handle);
496 acpi_bus_get_device(handle, &adev);
497 if (acpi_device_enumerated(adev))
498 acpi_device_set_power(adev, ACPI_STATE_D0);
501 static void acpiphp_set_acpi_region(struct acpiphp_slot *slot)
503 struct acpiphp_func *func;
504 union acpi_object params[2];
505 struct acpi_object_list arg_list;
507 list_for_each_entry(func, &slot->funcs, sibling) {
508 arg_list.count = 2;
509 arg_list.pointer = params;
510 params[0].type = ACPI_TYPE_INTEGER;
511 params[0].integer.value = ACPI_ADR_SPACE_PCI_CONFIG;
512 params[1].type = ACPI_TYPE_INTEGER;
513 params[1].integer.value = 1;
514 /* _REG is optional, we don't care about if there is failure */
515 acpi_evaluate_object(func_to_handle(func), "_REG", &arg_list,
516 NULL);
520 static void check_hotplug_bridge(struct acpiphp_slot *slot, struct pci_dev *dev)
522 struct acpiphp_func *func;
524 /* quirk, or pcie could set it already */
525 if (dev->is_hotplug_bridge)
526 return;
528 list_for_each_entry(func, &slot->funcs, sibling) {
529 if (PCI_FUNC(dev->devfn) == func->function) {
530 dev->is_hotplug_bridge = 1;
531 break;
536 static int acpiphp_rescan_slot(struct acpiphp_slot *slot)
538 struct acpiphp_func *func;
540 list_for_each_entry(func, &slot->funcs, sibling)
541 acpiphp_bus_add(func_to_handle(func));
543 return pci_scan_slot(slot->bus, PCI_DEVFN(slot->device, 0));
547 * enable_slot - enable, configure a slot
548 * @slot: slot to be enabled
550 * This function should be called per *physical slot*,
551 * not per each slot object in ACPI namespace.
553 static void __ref enable_slot(struct acpiphp_slot *slot)
555 struct pci_dev *dev;
556 struct pci_bus *bus = slot->bus;
557 struct acpiphp_func *func;
558 int max, pass;
559 LIST_HEAD(add_list);
561 acpiphp_rescan_slot(slot);
562 max = acpiphp_max_busnr(bus);
563 for (pass = 0; pass < 2; pass++) {
564 list_for_each_entry(dev, &bus->devices, bus_list) {
565 if (PCI_SLOT(dev->devfn) != slot->device)
566 continue;
568 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
569 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
570 max = pci_scan_bridge(bus, dev, max, pass);
571 if (pass && dev->subordinate) {
572 check_hotplug_bridge(slot, dev);
573 pcibios_resource_survey_bus(dev->subordinate);
574 __pci_bus_size_bridges(dev->subordinate,
575 &add_list);
580 __pci_bus_assign_resources(bus, &add_list, NULL);
582 acpiphp_sanitize_bus(bus);
583 acpiphp_set_hpp_values(bus);
584 acpiphp_set_acpi_region(slot);
586 list_for_each_entry(dev, &bus->devices, bus_list) {
587 /* Assume that newly added devices are powered on already. */
588 if (!dev->is_added)
589 dev->current_state = PCI_D0;
592 pci_bus_add_devices(bus);
594 slot->flags |= SLOT_ENABLED;
595 list_for_each_entry(func, &slot->funcs, sibling) {
596 dev = pci_get_slot(bus, PCI_DEVFN(slot->device,
597 func->function));
598 if (!dev) {
599 /* Do not set SLOT_ENABLED flag if some funcs
600 are not added. */
601 slot->flags &= (~SLOT_ENABLED);
602 continue;
607 /* return first device in slot, acquiring a reference on it */
608 static struct pci_dev *dev_in_slot(struct acpiphp_slot *slot)
610 struct pci_bus *bus = slot->bus;
611 struct pci_dev *dev;
612 struct pci_dev *ret = NULL;
614 down_read(&pci_bus_sem);
615 list_for_each_entry(dev, &bus->devices, bus_list)
616 if (PCI_SLOT(dev->devfn) == slot->device) {
617 ret = pci_dev_get(dev);
618 break;
620 up_read(&pci_bus_sem);
622 return ret;
626 * disable_slot - disable a slot
627 * @slot: ACPI PHP slot
629 static void disable_slot(struct acpiphp_slot *slot)
631 struct acpiphp_func *func;
632 struct pci_dev *pdev;
635 * enable_slot() enumerates all functions in this device via
636 * pci_scan_slot(), whether they have associated ACPI hotplug
637 * methods (_EJ0, etc.) or not. Therefore, we remove all functions
638 * here.
640 while ((pdev = dev_in_slot(slot))) {
641 pci_stop_and_remove_bus_device(pdev);
642 pci_dev_put(pdev);
645 list_for_each_entry(func, &slot->funcs, sibling)
646 acpiphp_bus_trim(func_to_handle(func));
648 slot->flags &= (~SLOT_ENABLED);
651 static bool acpiphp_no_hotplug(acpi_handle handle)
653 struct acpi_device *adev = NULL;
655 acpi_bus_get_device(handle, &adev);
656 return adev && adev->flags.no_hotplug;
659 static bool slot_no_hotplug(struct acpiphp_slot *slot)
661 struct acpiphp_func *func;
663 list_for_each_entry(func, &slot->funcs, sibling)
664 if (acpiphp_no_hotplug(func_to_handle(func)))
665 return true;
667 return false;
671 * get_slot_status - get ACPI slot status
672 * @slot: ACPI PHP slot
674 * If a slot has _STA for each function and if any one of them
675 * returned non-zero status, return it.
677 * If a slot doesn't have _STA and if any one of its functions'
678 * configuration space is configured, return 0x0f as a _STA.
680 * Otherwise return 0.
682 static unsigned int get_slot_status(struct acpiphp_slot *slot)
684 unsigned long long sta = 0;
685 struct acpiphp_func *func;
687 list_for_each_entry(func, &slot->funcs, sibling) {
688 if (func->flags & FUNC_HAS_STA) {
689 acpi_status status;
691 status = acpi_evaluate_integer(func_to_handle(func),
692 "_STA", NULL, &sta);
693 if (ACPI_SUCCESS(status) && sta)
694 break;
695 } else {
696 u32 dvid;
698 pci_bus_read_config_dword(slot->bus,
699 PCI_DEVFN(slot->device,
700 func->function),
701 PCI_VENDOR_ID, &dvid);
702 if (dvid != 0xffffffff) {
703 sta = ACPI_STA_ALL;
704 break;
709 return (unsigned int)sta;
713 * trim_stale_devices - remove PCI devices that are not responding.
714 * @dev: PCI device to start walking the hierarchy from.
716 static void trim_stale_devices(struct pci_dev *dev)
718 acpi_handle handle = ACPI_HANDLE(&dev->dev);
719 struct pci_bus *bus = dev->subordinate;
720 bool alive = false;
722 if (handle) {
723 acpi_status status;
724 unsigned long long sta;
726 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
727 alive = (ACPI_SUCCESS(status) && sta == ACPI_STA_ALL)
728 || acpiphp_no_hotplug(handle);
730 if (!alive) {
731 u32 v;
733 /* Check if the device responds. */
734 alive = pci_bus_read_dev_vendor_id(dev->bus, dev->devfn, &v, 0);
736 if (!alive) {
737 pci_stop_and_remove_bus_device(dev);
738 if (handle)
739 acpiphp_bus_trim(handle);
740 } else if (bus) {
741 struct pci_dev *child, *tmp;
743 /* The device is a bridge. so check the bus below it. */
744 pm_runtime_get_sync(&dev->dev);
745 list_for_each_entry_safe(child, tmp, &bus->devices, bus_list)
746 trim_stale_devices(child);
748 pm_runtime_put(&dev->dev);
753 * acpiphp_check_bridge - re-enumerate devices
754 * @bridge: where to begin re-enumeration
756 * Iterate over all slots under this bridge and make sure that if a
757 * card is present they are enabled, and if not they are disabled.
759 static void acpiphp_check_bridge(struct acpiphp_bridge *bridge)
761 struct acpiphp_slot *slot;
763 /* Bail out if the bridge is going away. */
764 if (bridge->is_going_away)
765 return;
767 list_for_each_entry(slot, &bridge->slots, node) {
768 struct pci_bus *bus = slot->bus;
769 struct pci_dev *dev, *tmp;
771 mutex_lock(&slot->crit_sect);
772 if (slot_no_hotplug(slot)) {
773 ; /* do nothing */
774 } else if (get_slot_status(slot) == ACPI_STA_ALL) {
775 /* remove stale devices if any */
776 list_for_each_entry_safe(dev, tmp, &bus->devices,
777 bus_list)
778 if (PCI_SLOT(dev->devfn) == slot->device)
779 trim_stale_devices(dev);
781 /* configure all functions */
782 enable_slot(slot);
783 } else {
784 disable_slot(slot);
786 mutex_unlock(&slot->crit_sect);
790 static void acpiphp_set_hpp_values(struct pci_bus *bus)
792 struct pci_dev *dev;
794 list_for_each_entry(dev, &bus->devices, bus_list)
795 pci_configure_slot(dev);
799 * Remove devices for which we could not assign resources, call
800 * arch specific code to fix-up the bus
802 static void acpiphp_sanitize_bus(struct pci_bus *bus)
804 struct pci_dev *dev, *tmp;
805 int i;
806 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM;
808 list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list) {
809 for (i=0; i<PCI_BRIDGE_RESOURCES; i++) {
810 struct resource *res = &dev->resource[i];
811 if ((res->flags & type_mask) && !res->start &&
812 res->end) {
813 /* Could not assign a required resources
814 * for this device, remove it */
815 pci_stop_and_remove_bus_device(dev);
816 break;
823 * ACPI event handlers
826 void acpiphp_check_host_bridge(acpi_handle handle)
828 struct acpiphp_bridge *bridge;
830 bridge = acpiphp_handle_to_bridge(handle);
831 if (bridge) {
832 acpiphp_check_bridge(bridge);
833 put_bridge(bridge);
837 static int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot);
839 static void hotplug_event(acpi_handle handle, u32 type, void *data)
841 struct acpiphp_context *context = data;
842 struct acpiphp_func *func = &context->func;
843 struct acpiphp_bridge *bridge;
844 char objname[64];
845 struct acpi_buffer buffer = { .length = sizeof(objname),
846 .pointer = objname };
848 mutex_lock(&acpiphp_context_lock);
849 bridge = context->bridge;
850 if (bridge)
851 get_bridge(bridge);
853 mutex_unlock(&acpiphp_context_lock);
855 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
857 switch (type) {
858 case ACPI_NOTIFY_BUS_CHECK:
859 /* bus re-enumerate */
860 pr_debug("%s: Bus check notify on %s\n", __func__, objname);
861 pr_debug("%s: re-enumerating slots under %s\n",
862 __func__, objname);
863 if (bridge) {
864 acpiphp_check_bridge(bridge);
865 } else {
866 struct acpiphp_slot *slot = func->slot;
868 if (slot->flags & SLOT_IS_GOING_AWAY)
869 break;
871 mutex_lock(&slot->crit_sect);
872 enable_slot(slot);
873 mutex_unlock(&slot->crit_sect);
875 break;
877 case ACPI_NOTIFY_DEVICE_CHECK:
878 /* device check */
879 pr_debug("%s: Device check notify on %s\n", __func__, objname);
880 if (bridge) {
881 acpiphp_check_bridge(bridge);
882 } else {
883 struct acpiphp_slot *slot = func->slot;
884 int ret;
886 if (slot->flags & SLOT_IS_GOING_AWAY)
887 break;
890 * Check if anything has changed in the slot and rescan
891 * from the parent if that's the case.
893 mutex_lock(&slot->crit_sect);
894 ret = acpiphp_rescan_slot(slot);
895 mutex_unlock(&slot->crit_sect);
896 if (ret)
897 acpiphp_check_bridge(func->parent);
899 break;
901 case ACPI_NOTIFY_EJECT_REQUEST:
902 /* request device eject */
903 pr_debug("%s: Device eject notify on %s\n", __func__, objname);
904 acpiphp_disable_and_eject_slot(func->slot);
905 break;
908 if (bridge)
909 put_bridge(bridge);
912 static void hotplug_event_work(void *data, u32 type)
914 struct acpiphp_context *context = data;
915 acpi_handle handle = context->handle;
917 acpi_scan_lock_acquire();
918 pci_lock_rescan_remove();
920 hotplug_event(handle, type, context);
922 pci_unlock_rescan_remove();
923 acpi_scan_lock_release();
924 acpi_evaluate_hotplug_ost(handle, type, ACPI_OST_SC_SUCCESS, NULL);
925 put_bridge(context->func.parent);
929 * handle_hotplug_event - handle ACPI hotplug event
930 * @handle: Notify()'ed acpi_handle
931 * @type: Notify code
932 * @data: pointer to acpiphp_context structure
934 * Handles ACPI event notification on slots.
936 static void handle_hotplug_event(acpi_handle handle, u32 type, void *data)
938 struct acpiphp_context *context;
939 u32 ost_code = ACPI_OST_SC_SUCCESS;
941 switch (type) {
942 case ACPI_NOTIFY_BUS_CHECK:
943 case ACPI_NOTIFY_DEVICE_CHECK:
944 break;
945 case ACPI_NOTIFY_EJECT_REQUEST:
946 ost_code = ACPI_OST_SC_EJECT_IN_PROGRESS;
947 acpi_evaluate_hotplug_ost(handle, type, ost_code, NULL);
948 break;
950 case ACPI_NOTIFY_DEVICE_WAKE:
951 return;
953 case ACPI_NOTIFY_FREQUENCY_MISMATCH:
954 acpi_handle_err(handle, "Device cannot be configured due "
955 "to a frequency mismatch\n");
956 goto out;
958 case ACPI_NOTIFY_BUS_MODE_MISMATCH:
959 acpi_handle_err(handle, "Device cannot be configured due "
960 "to a bus mode mismatch\n");
961 goto out;
963 case ACPI_NOTIFY_POWER_FAULT:
964 acpi_handle_err(handle, "Device has suffered a power fault\n");
965 goto out;
967 default:
968 acpi_handle_warn(handle, "Unsupported event type 0x%x\n", type);
969 ost_code = ACPI_OST_SC_UNRECOGNIZED_NOTIFY;
970 goto out;
973 mutex_lock(&acpiphp_context_lock);
974 context = acpiphp_get_context(handle);
975 if (context && !WARN_ON(context->handle != handle)) {
976 get_bridge(context->func.parent);
977 acpiphp_put_context(context);
978 acpi_hotplug_execute(hotplug_event_work, context, type);
979 mutex_unlock(&acpiphp_context_lock);
980 return;
982 mutex_unlock(&acpiphp_context_lock);
983 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
985 out:
986 acpi_evaluate_hotplug_ost(handle, type, ost_code, NULL);
990 * Create hotplug slots for the PCI bus.
991 * It should always return 0 to avoid skipping following notifiers.
993 void acpiphp_enumerate_slots(struct pci_bus *bus)
995 struct acpiphp_bridge *bridge;
996 acpi_handle handle;
997 acpi_status status;
999 if (acpiphp_disabled)
1000 return;
1002 handle = ACPI_HANDLE(bus->bridge);
1003 if (!handle)
1004 return;
1006 bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
1007 if (!bridge) {
1008 acpi_handle_err(handle, "No memory for bridge object\n");
1009 return;
1012 INIT_LIST_HEAD(&bridge->slots);
1013 kref_init(&bridge->ref);
1014 bridge->pci_dev = pci_dev_get(bus->self);
1015 bridge->pci_bus = bus;
1018 * Grab a ref to the subordinate PCI bus in case the bus is
1019 * removed via PCI core logical hotplug. The ref pins the bus
1020 * (which we access during module unload).
1022 get_device(&bus->dev);
1024 if (!pci_is_root_bus(bridge->pci_bus)) {
1025 struct acpiphp_context *context;
1028 * This bridge should have been registered as a hotplug function
1029 * under its parent, so the context should be there, unless the
1030 * parent is going to be handled by pciehp, in which case this
1031 * bridge is not interesting to us either.
1033 mutex_lock(&acpiphp_context_lock);
1034 context = acpiphp_get_context(handle);
1035 if (!context) {
1036 mutex_unlock(&acpiphp_context_lock);
1037 put_device(&bus->dev);
1038 pci_dev_put(bridge->pci_dev);
1039 kfree(bridge);
1040 return;
1042 bridge->context = context;
1043 context->bridge = bridge;
1044 /* Get a reference to the parent bridge. */
1045 get_bridge(context->func.parent);
1046 mutex_unlock(&acpiphp_context_lock);
1049 /* must be added to the list prior to calling register_slot */
1050 mutex_lock(&bridge_mutex);
1051 list_add(&bridge->list, &bridge_list);
1052 mutex_unlock(&bridge_mutex);
1054 /* register all slot objects under this bridge */
1055 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1,
1056 register_slot, NULL, bridge, NULL);
1057 if (ACPI_FAILURE(status)) {
1058 acpi_handle_err(handle, "failed to register slots\n");
1059 cleanup_bridge(bridge);
1060 put_bridge(bridge);
1064 /* Destroy hotplug slots associated with the PCI bus */
1065 void acpiphp_remove_slots(struct pci_bus *bus)
1067 struct acpiphp_bridge *bridge;
1069 if (acpiphp_disabled)
1070 return;
1072 mutex_lock(&bridge_mutex);
1073 list_for_each_entry(bridge, &bridge_list, list)
1074 if (bridge->pci_bus == bus) {
1075 mutex_unlock(&bridge_mutex);
1076 cleanup_bridge(bridge);
1077 put_bridge(bridge);
1078 return;
1081 mutex_unlock(&bridge_mutex);
1085 * acpiphp_enable_slot - power on slot
1086 * @slot: ACPI PHP slot
1088 int acpiphp_enable_slot(struct acpiphp_slot *slot)
1090 pci_lock_rescan_remove();
1092 if (slot->flags & SLOT_IS_GOING_AWAY)
1093 return -ENODEV;
1095 mutex_lock(&slot->crit_sect);
1096 /* configure all functions */
1097 if (!(slot->flags & SLOT_ENABLED))
1098 enable_slot(slot);
1100 mutex_unlock(&slot->crit_sect);
1102 pci_unlock_rescan_remove();
1103 return 0;
1107 * acpiphp_disable_and_eject_slot - power off and eject slot
1108 * @slot: ACPI PHP slot
1110 static int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot)
1112 struct acpiphp_func *func;
1114 if (slot->flags & SLOT_IS_GOING_AWAY)
1115 return -ENODEV;
1117 mutex_lock(&slot->crit_sect);
1119 /* unconfigure all functions */
1120 disable_slot(slot);
1122 list_for_each_entry(func, &slot->funcs, sibling)
1123 if (func->flags & FUNC_HAS_EJ0) {
1124 acpi_handle handle = func_to_handle(func);
1126 if (ACPI_FAILURE(acpi_evaluate_ej0(handle)))
1127 acpi_handle_err(handle, "_EJ0 failed\n");
1129 break;
1132 mutex_unlock(&slot->crit_sect);
1133 return 0;
1136 int acpiphp_disable_slot(struct acpiphp_slot *slot)
1138 int ret;
1140 pci_lock_rescan_remove();
1141 ret = acpiphp_disable_and_eject_slot(slot);
1142 pci_unlock_rescan_remove();
1143 return ret;
1147 * slot enabled: 1
1148 * slot disabled: 0
1150 u8 acpiphp_get_power_status(struct acpiphp_slot *slot)
1152 return (slot->flags & SLOT_ENABLED);
1156 * latch open: 1
1157 * latch closed: 0
1159 u8 acpiphp_get_latch_status(struct acpiphp_slot *slot)
1161 return !(get_slot_status(slot) & ACPI_STA_DEVICE_UI);
1165 * adapter presence : 1
1166 * absence : 0
1168 u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot)
1170 return !!get_slot_status(slot);