// SPDX-License-Identifier: GPL-2.0+ /* * ACPI PCI HotPlug glue functions to ACPI CA subsystem * * Copyright (C) 2002,2003 Takayoshi Kochi (t-kochi@bq.jp.nec.com) * Copyright (C) 2002 Hiroshi Aono (h-aono@ap.jp.nec.com) * Copyright (C) 2002,2003 NEC Corporation * Copyright (C) 2003-2005 Matthew Wilcox (willy@infradead.org) * Copyright (C) 2003-2005 Hewlett Packard * Copyright (C) 2005 Rajesh Shah (rajesh.shah@intel.com) * Copyright (C) 2005 Intel Corporation * * All rights reserved. * * Send feedback to <kristen.c.accardi@intel.com> * */ /* * Lifetime rules for pci_dev: * - The one in acpiphp_bridge has its refcount elevated by pci_get_slot() * when the bridge is scanned and it loses a refcount when the bridge * is removed. * - When a P2P bridge is present, we elevate the refcount on the subordinate * bus. It loses the refcount when the the driver unloads. */ #define pr_fmt(fmt) "acpiphp_glue: " fmt #include <linux/module.h> #include <linux/kernel.h> #include <linux/pci.h> #include <linux/pci_hotplug.h> #include <linux/pci-acpi.h> #include <linux/pm_runtime.h> #include <linux/mutex.h> #include <linux/slab.h> #include <linux/acpi.h> #include "../pci.h" #include "acpiphp.h" static LIST_HEAD(bridge_list); static DEFINE_MUTEX(bridge_mutex); static int acpiphp_hotplug_notify(struct acpi_device *adev, u32 type); static void acpiphp_post_dock_fixup(struct acpi_device *adev); static void acpiphp_sanitize_bus(struct pci_bus *bus); static void hotplug_event(u32 type, struct acpiphp_context *context); static void free_bridge(struct kref *kref); /** * acpiphp_init_context - Create hotplug context and grab a reference to it. * @adev: ACPI device object to create the context for. * * Call under acpi_hp_context_lock. */ static struct acpiphp_context *acpiphp_init_context(struct acpi_device *adev) { struct acpiphp_context *context; context = kzalloc(sizeof(*context), GFP_KERNEL); if (!context) return NULL; context->refcount = 1; context->hp.notify = acpiphp_hotplug_notify; context->hp.fixup = acpiphp_post_dock_fixup; acpi_set_hp_context(adev, &context->hp); return context; } /** * acpiphp_get_context - Get hotplug context and grab a reference to it. * @adev: ACPI device object to get the context for. * * Call under acpi_hp_context_lock. */ static struct acpiphp_context *acpiphp_get_context(struct acpi_device *adev) { struct acpiphp_context *context; if (!adev->hp) return NULL; context = to_acpiphp_context(adev->hp); context->refcount++; return context; } /** * acpiphp_put_context - Drop a reference to ACPI hotplug context. * @context: ACPI hotplug context to drop a reference to. * * The context object is removed if there are no more references to it. * * Call under acpi_hp_context_lock. */ static void acpiphp_put_context(struct acpiphp_context *context) { if (--context->refcount) return; WARN_ON(context->bridge); context->hp.self->hp = NULL; kfree(context); } static inline void get_bridge(struct acpiphp_bridge *bridge) { kref_get(&bridge->ref); } static inline void put_bridge(struct acpiphp_bridge *bridge) { kref_put(&bridge->ref, free_bridge); } static struct acpiphp_context *acpiphp_grab_context(struct acpi_device *adev) { struct acpiphp_context *context; acpi_lock_hp_context(); context = acpiphp_get_context(adev); if (!context) goto unlock; if (context->func.parent->is_going_away) { acpiphp_put_context(context); context = NULL; goto unlock; } get_bridge(context->func.parent); acpiphp_put_context(context); unlock: acpi_unlock_hp_context(); return context; } static void acpiphp_let_context_go(struct acpiphp_context *context) { put_bridge(context->func.parent); } static void free_bridge(struct kref *kref) { struct acpiphp_context *context; struct acpiphp_bridge *bridge; struct acpiphp_slot *slot, *next; struct acpiphp_func *func, *tmp; acpi_lock_hp_context(); bridge = container_of(kref, struct acpiphp_bridge, ref); list_for_each_entry_safe(slot, next, &bridge->slots, node) { list_for_each_entry_safe(func, tmp, &slot->funcs, sibling) acpiphp_put_context(func_to_context(func)); kfree(slot); } context = bridge->context; /* Root bridges will not have hotplug context. */ if (context) { /* Release the reference taken by acpiphp_enumerate_slots(). */ put_bridge(context->func.parent); context->bridge = NULL; acpiphp_put_context(context); } put_device(&bridge->pci_bus->dev); pci_dev_put(bridge->pci_dev); kfree(bridge); acpi_unlock_hp_context(); } /** * acpiphp_post_dock_fixup - Post-dock fixups for PCI devices. * @adev: ACPI device object corresponding to a PCI device. * * TBD - figure out a way to only call fixups for systems that require them. */ static void acpiphp_post_dock_fixup(struct acpi_device *adev) { struct acpiphp_context *context = acpiphp_grab_context(adev); struct pci_bus *bus; u32 buses; if (!context) return; bus = context->func.slot->bus; if (!bus->self) goto out; /* fixup bad _DCK function that rewrites * secondary bridge on slot */ pci_read_config_dword(bus->self, PCI_PRIMARY_BUS, &buses); if (((buses >> 8) & 0xff) != bus->busn_res.start) { buses = (buses & 0xff000000) | ((unsigned int)(bus->primary) << 0) | ((unsigned int)(bus->busn_res.start) << 8) | ((unsigned int)(bus->busn_res.end) << 16); pci_write_config_dword(bus->self, PCI_PRIMARY_BUS, buses); } out: acpiphp_let_context_go(context); } /** * acpiphp_add_context - Add ACPIPHP context to an ACPI device object. * @handle: ACPI handle of the object to add a context to. * @lvl: Not used. * @data: The object's parent ACPIPHP bridge. * @rv: Not used. */ static acpi_status acpiphp_add_context(acpi_handle handle, u32 lvl, void *data, void **rv) { struct acpiphp_bridge *bridge = data; struct acpiphp_context *context; struct acpi_device *adev; struct acpiphp_slot *slot; struct acpiphp_func *newfunc; acpi_status status = AE_OK; unsigned long long adr; int device, function; struct pci_bus *pbus = bridge->pci_bus; struct pci_dev *pdev = bridge->pci_dev; u32 val; status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr); if (ACPI_FAILURE(status)) { if (status != AE_NOT_FOUND) acpi_handle_warn(handle, "can't evaluate _ADR (%#x)\n", status); return AE_OK; } if (acpi_bus_get_device(handle, &adev)) return AE_OK; device = (adr >> 16) & 0xffff; function = adr & 0xffff; acpi_lock_hp_context(); context = acpiphp_init_context(adev); if (!context) { acpi_unlock_hp_context(); acpi_handle_err(handle, "No hotplug context\n"); return AE_NOT_EXIST; } newfunc = &context->func; newfunc->function = function; newfunc->parent = bridge; acpi_unlock_hp_context(); /* * If this is a dock device, its _EJ0 should be executed by the dock * notify handler after calling _DCK. */ if (!is_dock_device(adev) && acpi_has_method(handle, "_EJ0")) newfunc->flags = FUNC_HAS_EJ0; if (acpi_has_method(handle, "_STA")) newfunc->flags |= FUNC_HAS_STA; /* search for objects that share the same slot */ list_for_each_entry(slot, &bridge->slots, node) if (slot->device == device) goto slot_found; slot = kzalloc(sizeof(struct acpiphp_slot), GFP_KERNEL); if (!slot) { acpi_lock_hp_context(); acpiphp_put_context(context); acpi_unlock_hp_context(); return AE_NO_MEMORY; } slot->bus = bridge->pci_bus; slot->device = device; INIT_LIST_HEAD(&slot->funcs); list_add_tail(&slot->node, &bridge->slots); /* * Expose slots to user space for functions that have _EJ0 or _RMV or * are located in dock stations. Do not expose them for devices handled * by the native PCIe hotplug (PCIeHP) or standard PCI hotplug * (SHPCHP), because that code is supposed to expose slots to user * space in those cases. */ if ((acpi_pci_check_ejectable(pbus, handle) || is_dock_device(adev)) && !(pdev && hotplug_is_native(pdev))) { unsigned long long sun; int retval; bridge->nr_slots++; status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun); if (ACPI_FAILURE(status)) sun = bridge->nr_slots; pr_debug("found ACPI PCI Hotplug slot %llu at PCI %04x:%02x:%02x\n", sun, pci_domain_nr(pbus), pbus->number, device); retval = acpiphp_register_hotplug_slot(slot, sun); if (retval) { slot->slot = NULL; bridge->nr_slots--; if (retval == -EBUSY) pr_warn("Slot %llu already registered by another hotplug driver\n", sun); else pr_warn("acpiphp_register_hotplug_slot failed (err code = 0x%x)\n", retval); } /* Even if the slot registration fails, we can still use it. */ } slot_found: newfunc->slot = slot; list_add_tail(&newfunc->sibling, &slot->funcs); if (pci_bus_read_dev_vendor_id(pbus, PCI_DEVFN(device, function), &val, 60*1000)) slot->flags |= SLOT_ENABLED; return AE_OK; } static void cleanup_bridge(struct acpiphp_bridge *bridge) { struct acpiphp_slot *slot; struct acpiphp_func *func; list_for_each_entry(slot, &bridge->slots, node) { list_for_each_entry(func, &slot->funcs, sibling) { struct acpi_device *adev = func_to_acpi_device(func); acpi_lock_hp_context(); adev->hp->notify = NULL; adev->hp->fixup = NULL; acpi_unlock_hp_context(); } slot->flags |= SLOT_IS_GOING_AWAY; if (slot->slot) acpiphp_unregister_hotplug_slot(slot); } mutex_lock(&bridge_mutex); list_del(&bridge->list); mutex_unlock(&bridge_mutex); acpi_lock_hp_context(); bridge->is_going_away = true; acpi_unlock_hp_context(); } /** * acpiphp_max_busnr - return the highest reserved bus number under the given bus. * @bus: bus to start search with */ static unsigned char acpiphp_max_busnr(struct pci_bus *bus) { struct pci_bus *tmp; unsigned char max, n; /* * pci_bus_max_busnr will return the highest * reserved busnr for all these children. * that is equivalent to the bus->subordinate * value. We don't want to use the parent's * bus->subordinate value because it could have * padding in it. */ max = bus->busn_res.start; list_for_each_entry(tmp, &bus->children, node) { n = pci_bus_max_busnr(tmp); if (n > max) max = n; } return max; } static void acpiphp_set_acpi_region(struct acpiphp_slot *slot) { struct acpiphp_func *func; list_for_each_entry(func, &slot->funcs, sibling) { /* _REG is optional, we don't care about if there is failure */ acpi_evaluate_reg(func_to_handle(func), ACPI_ADR_SPACE_PCI_CONFIG, ACPI_REG_CONNECT); } } static void check_hotplug_bridge(struct acpiphp_slot *slot, struct pci_dev *dev) { struct acpiphp_func *func; /* quirk, or pcie could set it already */ if (dev->is_hotplug_bridge) return; list_for_each_entry(func, &slot->funcs, sibling) { if (PCI_FUNC(dev->devfn) == func->function) { dev->is_hotplug_bridge = 1; break; } } } static int acpiphp_rescan_slot(struct acpiphp_slot *slot) { struct acpiphp_func *func; list_for_each_entry(func, &slot->funcs, sibling) { struct acpi_device *adev = func_to_acpi_device(func); acpi_bus_scan(adev->handle); if (acpi_device_enumerated(adev)) acpi_device_set_power(adev, ACPI_STATE_D0); } return pci_scan_slot(slot->bus, PCI_DEVFN(slot->device, 0)); } static void acpiphp_native_scan_bridge(struct pci_dev *bridge) { struct pci_bus *bus = bridge->subordinate; struct pci_dev *dev; int max; if (!bus) return; max = bus->busn_res.start; /* Scan already configured non-hotplug bridges */ for_each_pci_bridge(dev, bus) { if (!hotplug_is_native(dev)) max = pci_scan_bridge(bus, dev, max, 0); } /* Scan non-hotplug bridges that need to be reconfigured */ for_each_pci_bridge(dev, bus) { if (hotplug_is_native(dev)) continue; max = pci_scan_bridge(bus, dev, max, 1); if (dev->subordinate) { pcibios_resource_survey_bus(dev->subordinate); pci_bus_size_bridges(dev->subordinate); pci_bus_assign_resources(dev->subordinate); } } } /** * enable_slot - enable, configure a slot * @slot: slot to be enabled * @bridge: true if enable is for the whole bridge (not a single slot) * * This function should be called per *physical slot*, * not per each slot object in ACPI namespace. */ static void enable_slot(struct acpiphp_slot *slot, bool bridge) { struct pci_dev *dev; struct pci_bus *bus = slot->bus; struct acpiphp_func *func; if (bridge && bus->self && hotplug_is_native(bus->self)) { /* * If native hotplug is used, it will take care of hotplug * slot management and resource allocation for hotplug * bridges. However, ACPI hotplug may still be used for * non-hotplug bridges to bring in additional devices such * as a Thunderbolt host controller. */ for_each_pci_bridge(dev, bus) { if (PCI_SLOT(dev->devfn) == slot->device) acpiphp_native_scan_bridge(dev); } } else { LIST_HEAD(add_list); int max, pass; acpiphp_rescan_slot(slot); max = acpiphp_max_busnr(bus); for (pass = 0; pass < 2; pass++) { for_each_pci_bridge(dev, bus) { if (PCI_SLOT(dev->devfn) != slot->device) continue; max = pci_scan_bridge(bus, dev, max, pass); if (pass && dev->subordinate) { check_hotplug_bridge(slot, dev); pcibios_resource_survey_bus(dev->subordinate); __pci_bus_size_bridges(dev->subordinate, &add_list); } } } __pci_bus_assign_resources(bus, &add_list, NULL); } acpiphp_sanitize_bus(bus); pcie_bus_configure_settings(bus); acpiphp_set_acpi_region(slot); list_for_each_entry(dev, &bus->devices, bus_list) { /* Assume that newly added devices are powered on already. */ if (!pci_dev_is_added(dev)) dev->current_state = PCI_D0; } pci_bus_add_devices(bus); slot->flags |= SLOT_ENABLED; list_for_each_entry(func, &slot->funcs, sibling) { dev = pci_get_slot(bus, PCI_DEVFN(slot->device, func->function)); if (!dev) { /* Do not set SLOT_ENABLED flag if some funcs are not added. */ slot->flags &= ~SLOT_ENABLED; continue; } } } /** * disable_slot - disable a slot * @slot: ACPI PHP slot */ static void disable_slot(struct acpiphp_slot *slot) { struct pci_bus *bus = slot->bus; struct pci_dev *dev, *prev; struct acpiphp_func *func; /* * enable_slot() enumerates all functions in this device via * pci_scan_slot(), whether they have associated ACPI hotplug * methods (_EJ0, etc.) or not. Therefore, we remove all functions * here. */ list_for_each_entry_safe_reverse(dev, prev, &bus->devices, bus_list) if (PCI_SLOT(dev->devfn) == slot->device) pci_stop_and_remove_bus_device(dev); list_for_each_entry(func, &slot->funcs, sibling) acpi_bus_trim(func_to_acpi_device(func)); slot->flags &= ~SLOT_ENABLED; } static bool slot_no_hotplug(struct acpiphp_slot *slot) { struct pci_bus *bus = slot->bus; struct pci_dev *dev; list_for_each_entry(dev, &bus->devices, bus_list) { if (PCI_SLOT(dev->devfn) == slot->device && dev->ignore_hotplug) return true; } return false; } /** * get_slot_status - get ACPI slot status * @slot: ACPI PHP slot * * If a slot has _STA for each function and if any one of them * returned non-zero status, return it. * * If a slot doesn't have _STA and if any one of its functions' * configuration space is configured, return 0x0f as a _STA. * * Otherwise return 0. */ static unsigned int get_slot_status(struct acpiphp_slot *slot) { unsigned long long sta = 0; struct acpiphp_func *func; u32 dvid; list_for_each_entry(func, &slot->funcs, sibling) { if (func->flags & FUNC_HAS_STA) { acpi_status status; status = acpi_evaluate_integer(func_to_handle(func), "_STA", NULL, &sta); if (ACPI_SUCCESS(status) && sta) break; } else { if (pci_bus_read_dev_vendor_id(slot->bus, PCI_DEVFN(slot->device, func->function), &dvid, 0)) { sta = ACPI_STA_ALL; break; } } } if (!sta) { /* * Check for the slot itself since it may be that the * ACPI slot is a device below PCIe upstream port so in * that case it may not even be reachable yet. */ if (pci_bus_read_dev_vendor_id(slot->bus, PCI_DEVFN(slot->device, 0), &dvid, 0)) { sta = ACPI_STA_ALL; } } return (unsigned int)sta; } static inline bool device_status_valid(unsigned int sta) { /* * ACPI spec says that _STA may return bit 0 clear with bit 3 set * if the device is valid but does not require a device driver to be * loaded (Section 6.3.7 of ACPI 5.0A). */ unsigned int mask = ACPI_STA_DEVICE_ENABLED | ACPI_STA_DEVICE_FUNCTIONING; return (sta & mask) == mask; } /** * trim_stale_devices - remove PCI devices that are not responding. * @dev: PCI device to start walking the hierarchy from. */ static void trim_stale_devices(struct pci_dev *dev) { struct acpi_device *adev = ACPI_COMPANION(&dev->dev); struct pci_bus *bus = dev->subordinate; bool alive = dev->ignore_hotplug; if (adev) { acpi_status status; unsigned long long sta; status = acpi_evaluate_integer(adev->handle, "_STA", NULL, &sta); alive = alive || (ACPI_SUCCESS(status) && device_status_valid(sta)); } if (!alive) alive = pci_device_is_present(dev); if (!alive) { pci_dev_set_disconnected(dev, NULL); if (pci_has_subordinate(dev)) pci_walk_bus(dev->subordinate, pci_dev_set_disconnected, NULL); pci_stop_and_remove_bus_device(dev); if (adev) acpi_bus_trim(adev); } else if (bus) { struct pci_dev *child, *tmp; /* The device is a bridge. so check the bus below it. */ pm_runtime_get_sync(&dev->dev); list_for_each_entry_safe_reverse(child, tmp, &bus->devices, bus_list) trim_stale_devices(child); pm_runtime_put(&dev->dev); } } /** * acpiphp_check_bridge - re-enumerate devices * @bridge: where to begin re-enumeration * * Iterate over all slots under this bridge and make sure that if a * card is present they are enabled, and if not they are disabled. */ static void acpiphp_check_bridge(struct acpiphp_bridge *bridge) { struct acpiphp_slot *slot; /* Bail out if the bridge is going away. */ if (bridge->is_going_away) return; if (bridge->pci_dev) pm_runtime_get_sync(&bridge->pci_dev->dev); list_for_each_entry(slot, &bridge->slots, node) { struct pci_bus *bus = slot->bus; struct pci_dev *dev, *tmp; if (slot_no_hotplug(slot)) { ; /* do nothing */ } else if (device_status_valid(get_slot_status(slot))) { /* remove stale devices if any */ list_for_each_entry_safe_reverse(dev, tmp, &bus->devices, bus_list) if (PCI_SLOT(dev->devfn) == slot->device) trim_stale_devices(dev); /* configure all functions */ enable_slot(slot, true); } else { disable_slot(slot); } } if (bridge->pci_dev) pm_runtime_put(&bridge->pci_dev->dev); } /* * Remove devices for which we could not assign resources, call * arch specific code to fix-up the bus */ static void acpiphp_sanitize_bus(struct pci_bus *bus) { struct pci_dev *dev, *tmp; int i; unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM; list_for_each_entry_safe_reverse(dev, tmp, &bus->devices, bus_list) { for (i = 0; i < PCI_BRIDGE_RESOURCES; i++) { struct resource *res = &dev->resource[i]; if ((res->flags & type_mask) && !res->start && res->end) { /* Could not assign a required resources * for this device, remove it */ pci_stop_and_remove_bus_device(dev); break; } } } } /* * ACPI event handlers */ void acpiphp_check_host_bridge(struct acpi_device *adev) { struct acpiphp_bridge *bridge = NULL; acpi_lock_hp_context(); if (adev->hp) { bridge = to_acpiphp_root_context(adev->hp)->root_bridge; if (bridge) get_bridge(bridge); } acpi_unlock_hp_context(); if (bridge) { pci_lock_rescan_remove(); acpiphp_check_bridge(bridge); pci_unlock_rescan_remove(); put_bridge(bridge); } } static int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot); static void hotplug_event(u32 type, struct acpiphp_context *context) { acpi_handle handle = context->hp.self->handle; struct acpiphp_func *func = &context->func; struct acpiphp_slot *slot = func->slot; struct acpiphp_bridge *bridge; acpi_lock_hp_context(); bridge = context->bridge; if (bridge) get_bridge(bridge); acpi_unlock_hp_context(); pci_lock_rescan_remove(); switch (type) { case ACPI_NOTIFY_BUS_CHECK: /* bus re-enumerate */ acpi_handle_debug(handle, "Bus check in %s()\n", __func__); if (bridge) acpiphp_check_bridge(bridge); else if (!(slot->flags & SLOT_IS_GOING_AWAY)) enable_slot(slot, false); break; case ACPI_NOTIFY_DEVICE_CHECK: /* device check */ acpi_handle_debug(handle, "Device check in %s()\n", __func__); if (bridge) { acpiphp_check_bridge(bridge); } else if (!(slot->flags & SLOT_IS_GOING_AWAY)) { /* * Check if anything has changed in the slot and rescan * from the parent if that's the case. */ if (acpiphp_rescan_slot(slot)) acpiphp_check_bridge(func->parent); } break; case ACPI_NOTIFY_EJECT_REQUEST: /* request device eject */ acpi_handle_debug(handle, "Eject request in %s()\n", __func__); acpiphp_disable_and_eject_slot(slot); break; } pci_unlock_rescan_remove(); if (bridge) put_bridge(bridge); } static int acpiphp_hotplug_notify(struct acpi_device *adev, u32 type) { struct acpiphp_context *context; context = acpiphp_grab_context(adev); if (!context) return -ENODATA; hotplug_event(type, context); acpiphp_let_context_go(context); return 0; } /** * acpiphp_enumerate_slots - Enumerate PCI slots for a given bus. * @bus: PCI bus to enumerate the slots for. * * A "slot" is an object associated with a PCI device number. All functions * (PCI devices) with the same bus and device number belong to the same slot. */ void acpiphp_enumerate_slots(struct pci_bus *bus) { struct acpiphp_bridge *bridge; struct acpi_device *adev; acpi_handle handle; acpi_status status; if (acpiphp_disabled) return; adev = ACPI_COMPANION(bus->bridge); if (!adev) return; handle = adev->handle; bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL); if (!bridge) return; INIT_LIST_HEAD(&bridge->slots); kref_init(&bridge->ref); bridge->pci_dev = pci_dev_get(bus->self); bridge->pci_bus = bus; /* * Grab a ref to the subordinate PCI bus in case the bus is * removed via PCI core logical hotplug. The ref pins the bus * (which we access during module unload). */ get_device(&bus->dev); acpi_lock_hp_context(); if (pci_is_root_bus(bridge->pci_bus)) { struct acpiphp_root_context *root_context; root_context = kzalloc(sizeof(*root_context), GFP_KERNEL); if (!root_context) goto err; root_context->root_bridge = bridge; acpi_set_hp_context(adev, &root_context->hp); } else { struct acpiphp_context *context; /* * This bridge should have been registered as a hotplug function * under its parent, so the context should be there, unless the * parent is going to be handled by pciehp, in which case this * bridge is not interesting to us either. */ context = acpiphp_get_context(adev); if (!context) goto err; bridge->context = context; context->bridge = bridge; /* Get a reference to the parent bridge. */ get_bridge(context->func.parent); } acpi_unlock_hp_context(); /* Must be added to the list prior to calling acpiphp_add_context(). */ mutex_lock(&bridge_mutex); list_add(&bridge->list, &bridge_list); mutex_unlock(&bridge_mutex); /* register all slot objects under this bridge */ status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1, acpiphp_add_context, NULL, bridge, NULL); if (ACPI_FAILURE(status)) { acpi_handle_err(handle, "failed to register slots\n"); cleanup_bridge(bridge); put_bridge(bridge); } return; err: acpi_unlock_hp_context(); put_device(&bus->dev); pci_dev_put(bridge->pci_dev); kfree(bridge); } static void acpiphp_drop_bridge(struct acpiphp_bridge *bridge) { if (pci_is_root_bus(bridge->pci_bus)) { struct acpiphp_root_context *root_context; struct acpi_device *adev; acpi_lock_hp_context(); adev = ACPI_COMPANION(bridge->pci_bus->bridge); root_context = to_acpiphp_root_context(adev->hp); adev->hp = NULL; acpi_unlock_hp_context(); kfree(root_context); } cleanup_bridge(bridge); put_bridge(bridge); } /** * acpiphp_remove_slots - Remove slot objects associated with a given bus. * @bus: PCI bus to remove the slot objects for. */ void acpiphp_remove_slots(struct pci_bus *bus) { struct acpiphp_bridge *bridge; if (acpiphp_disabled) return; mutex_lock(&bridge_mutex); list_for_each_entry(bridge, &bridge_list, list) if (bridge->pci_bus == bus) { mutex_unlock(&bridge_mutex); acpiphp_drop_bridge(bridge); return; } mutex_unlock(&bridge_mutex); } /** * acpiphp_enable_slot - power on slot * @slot: ACPI PHP slot */ int acpiphp_enable_slot(struct acpiphp_slot *slot) { pci_lock_rescan_remove(); if (slot->flags & SLOT_IS_GOING_AWAY) { pci_unlock_rescan_remove(); return -ENODEV; } /* configure all functions */ if (!(slot->flags & SLOT_ENABLED)) enable_slot(slot, false); pci_unlock_rescan_remove(); return 0; } /** * acpiphp_disable_and_eject_slot - power off and eject slot * @slot: ACPI PHP slot */ static int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot) { struct acpiphp_func *func; if (slot->flags & SLOT_IS_GOING_AWAY) return -ENODEV; /* unconfigure all functions */ disable_slot(slot); list_for_each_entry(func, &slot->funcs, sibling) if (func->flags & FUNC_HAS_EJ0) { acpi_handle handle = func_to_handle(func); if (ACPI_FAILURE(acpi_evaluate_ej0(handle))) acpi_handle_err(handle, "_EJ0 failed\n"); break; } return 0; } int acpiphp_disable_slot(struct acpiphp_slot *slot) { int ret; /* * Acquire acpi_scan_lock to ensure that the execution of _EJ0 in * acpiphp_disable_and_eject_slot() will be synchronized properly. */ acpi_scan_lock_acquire(); pci_lock_rescan_remove(); ret = acpiphp_disable_and_eject_slot(slot); pci_unlock_rescan_remove(); acpi_scan_lock_release(); return ret; } /* * slot enabled: 1 * slot disabled: 0 */ u8 acpiphp_get_power_status(struct acpiphp_slot *slot) { return (slot->flags & SLOT_ENABLED); } /* * latch open: 1 * latch closed: 0 */ u8 acpiphp_get_latch_status(struct acpiphp_slot *slot) { return !(get_slot_status(slot) & ACPI_STA_DEVICE_UI); } /* * adapter presence : 1 * absence : 0 */ u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot) { return !!get_slot_status(slot); }