/* * 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 (matthew.wilcox@hp.com) * Copyright (C) 2003-2005 Hewlett Packard * Copyright (C) 2005 Rajesh Shah (rajesh.shah@intel.com) * Copyright (C) 2005 Intel Corporation * * All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or (at * your option) any later version. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or * NON INFRINGEMENT. See the GNU General Public License for more * details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. * * Send feedback to * */ /* * 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. */ #include #include #include #include #include #include #include #include #include #include #include "../pci.h" #include "acpiphp.h" static LIST_HEAD(bridge_list); static DEFINE_MUTEX(bridge_mutex); static DEFINE_MUTEX(acpiphp_context_lock); #define MY_NAME "acpiphp_glue" static void handle_hotplug_event(acpi_handle handle, u32 type, void *data); static void acpiphp_sanitize_bus(struct pci_bus *bus); static void acpiphp_set_hpp_values(struct pci_bus *bus); static void hotplug_event(acpi_handle handle, u32 type, void *data); static void free_bridge(struct kref *kref); static void acpiphp_context_handler(acpi_handle handle, void *context) { /* Intentionally empty. */ } /** * acpiphp_init_context - Create hotplug context and grab a reference to it. * @handle: ACPI object handle to create the context for. * * Call under acpiphp_context_lock. */ static struct acpiphp_context *acpiphp_init_context(acpi_handle handle) { struct acpiphp_context *context; acpi_status status; context = kzalloc(sizeof(*context), GFP_KERNEL); if (!context) return NULL; context->handle = handle; context->refcount = 1; status = acpi_attach_data(handle, acpiphp_context_handler, context); if (ACPI_FAILURE(status)) { kfree(context); return NULL; } return context; } /** * acpiphp_get_context - Get hotplug context and grab a reference to it. * @handle: ACPI object handle to get the context for. * * Call under acpiphp_context_lock. */ static struct acpiphp_context *acpiphp_get_context(acpi_handle handle) { struct acpiphp_context *context = NULL; acpi_status status; void *data; status = acpi_get_data(handle, acpiphp_context_handler, &data); if (ACPI_SUCCESS(status)) { context = data; context->refcount++; } return context; } /** * acpiphp_put_context - Drop a reference to ACPI hotplug context. * @handle: ACPI object handle to put the context for. * * The context object is removed if there are no more references to it. * * Call under acpiphp_context_lock. */ static void acpiphp_put_context(struct acpiphp_context *context) { if (--context->refcount) return; WARN_ON(context->bridge); acpi_detach_data(context->handle, acpiphp_context_handler); 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 void free_bridge(struct kref *kref) { struct acpiphp_context *context; struct acpiphp_bridge *bridge; struct acpiphp_slot *slot, *next; struct acpiphp_func *func, *tmp; mutex_lock(&acpiphp_context_lock); 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); mutex_unlock(&acpiphp_context_lock); } /* * the _DCK method can do funny things... and sometimes not * hah-hah funny. * * TBD - figure out a way to only call fixups for * systems that require them. */ static void post_dock_fixups(acpi_handle not_used, u32 event, void *data) { struct acpiphp_context *context = data; struct pci_bus *bus = context->func.slot->bus; u32 buses; if (!bus->self) return; /* 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); } } static const struct acpi_dock_ops acpiphp_dock_ops = { .fixup = post_dock_fixups, .handler = hotplug_event, }; /* Check whether the PCI device is managed by native PCIe hotplug driver */ static bool device_is_managed_by_native_pciehp(struct pci_dev *pdev) { u32 reg32; acpi_handle tmp; struct acpi_pci_root *root; /* Check whether the PCIe port supports native PCIe hotplug */ if (pcie_capability_read_dword(pdev, PCI_EXP_SLTCAP, ®32)) return false; if (!(reg32 & PCI_EXP_SLTCAP_HPC)) return false; /* * Check whether native PCIe hotplug has been enabled for * this PCIe hierarchy. */ tmp = acpi_find_root_bridge_handle(pdev); if (!tmp) return false; root = acpi_pci_find_root(tmp); if (!root) return false; if (!(root->osc_control_set & OSC_PCI_EXPRESS_NATIVE_HP_CONTROL)) return false; return true; } static void acpiphp_dock_init(void *data) { struct acpiphp_context *context = data; get_bridge(context->func.parent); } static void acpiphp_dock_release(void *data) { struct acpiphp_context *context = data; put_bridge(context->func.parent); } /* callback routine to register each ACPI PCI slot object */ static acpi_status register_slot(acpi_handle handle, u32 lvl, void *data, void **rv) { struct acpiphp_bridge *bridge = data; struct acpiphp_context *context; 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; if (pdev && device_is_managed_by_native_pciehp(pdev)) return AE_OK; 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; } device = (adr >> 16) & 0xffff; function = adr & 0xffff; mutex_lock(&acpiphp_context_lock); context = acpiphp_init_context(handle); if (!context) { mutex_unlock(&acpiphp_context_lock); acpi_handle_err(handle, "No hotplug context\n"); return AE_NOT_EXIST; } newfunc = &context->func; newfunc->function = function; newfunc->parent = bridge; mutex_unlock(&acpiphp_context_lock); if (acpi_has_method(handle, "_EJ0")) newfunc->flags = FUNC_HAS_EJ0; if (acpi_has_method(handle, "_STA")) newfunc->flags |= FUNC_HAS_STA; if (acpi_has_method(handle, "_DCK")) newfunc->flags |= FUNC_HAS_DCK; /* 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) { status = AE_NO_MEMORY; goto err; } slot->bus = bridge->pci_bus; slot->device = device; INIT_LIST_HEAD(&slot->funcs); mutex_init(&slot->crit_sect); list_add_tail(&slot->node, &bridge->slots); /* Register slots for ejectable funtions only. */ if (acpi_pci_check_ejectable(pbus, handle) || is_dock_device(handle)) { 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; dbg("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) warn("Slot %llu already registered by another " "hotplug driver\n", sun); else 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; if (is_dock_device(handle)) { /* we don't want to call this device's _EJ0 * because we want the dock notify handler * to call it after it calls _DCK */ newfunc->flags &= ~FUNC_HAS_EJ0; if (register_hotplug_dock_device(handle, &acpiphp_dock_ops, context, acpiphp_dock_init, acpiphp_dock_release)) dbg("failed to register dock device\n"); } /* install notify handler */ if (!(newfunc->flags & FUNC_HAS_DCK)) { status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, handle_hotplug_event, context); if (ACPI_FAILURE(status)) acpi_handle_err(handle, "failed to install notify handler\n"); } return AE_OK; err: mutex_lock(&acpiphp_context_lock); acpiphp_put_context(context); mutex_unlock(&acpiphp_context_lock); return status; } static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle) { struct acpiphp_context *context; struct acpiphp_bridge *bridge = NULL; mutex_lock(&acpiphp_context_lock); context = acpiphp_get_context(handle); if (context) { bridge = context->bridge; if (bridge) get_bridge(bridge); acpiphp_put_context(context); } mutex_unlock(&acpiphp_context_lock); return bridge; } static void cleanup_bridge(struct acpiphp_bridge *bridge) { struct acpiphp_slot *slot; struct acpiphp_func *func; acpi_status status; list_for_each_entry(slot, &bridge->slots, node) { list_for_each_entry(func, &slot->funcs, sibling) { acpi_handle handle = func_to_handle(func); if (is_dock_device(handle)) unregister_hotplug_dock_device(handle); if (!(func->flags & FUNC_HAS_DCK)) { status = acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY, handle_hotplug_event); if (ACPI_FAILURE(status)) err("failed to remove notify handler\n"); } } if (slot->slot) acpiphp_unregister_hotplug_slot(slot); } mutex_lock(&bridge_mutex); list_del(&bridge->list); mutex_unlock(&bridge_mutex); } /** * 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 list_head *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(tmp, &bus->children) { n = pci_bus_max_busnr(pci_bus_b(tmp)); if (n > max) max = n; } return max; } /** * acpiphp_bus_trim - Trim device objects in an ACPI namespace subtree. * @handle: ACPI device object handle to start from. */ static void acpiphp_bus_trim(acpi_handle handle) { struct acpi_device *adev = NULL; acpi_bus_get_device(handle, &adev); if (adev) acpi_bus_trim(adev); } /** * acpiphp_bus_add - Scan ACPI namespace subtree. * @handle: ACPI object handle to start the scan from. */ static void acpiphp_bus_add(acpi_handle handle) { struct acpi_device *adev = NULL; acpi_bus_scan(handle); acpi_bus_get_device(handle, &adev); if (adev) acpi_device_set_power(adev, ACPI_STATE_D0); } static void acpiphp_set_acpi_region(struct acpiphp_slot *slot) { struct acpiphp_func *func; union acpi_object params[2]; struct acpi_object_list arg_list; list_for_each_entry(func, &slot->funcs, sibling) { arg_list.count = 2; arg_list.pointer = params; params[0].type = ACPI_TYPE_INTEGER; params[0].integer.value = ACPI_ADR_SPACE_PCI_CONFIG; params[1].type = ACPI_TYPE_INTEGER; params[1].integer.value = 1; /* _REG is optional, we don't care about if there is failure */ acpi_evaluate_object(func_to_handle(func), "_REG", &arg_list, NULL); } } 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) acpiphp_bus_add(func_to_handle(func)); return pci_scan_slot(slot->bus, PCI_DEVFN(slot->device, 0)); } /** * enable_slot - enable, configure a slot * @slot: slot to be enabled * * This function should be called per *physical slot*, * not per each slot object in ACPI namespace. */ static void __ref enable_slot(struct acpiphp_slot *slot) { struct pci_dev *dev; struct pci_bus *bus = slot->bus; struct acpiphp_func *func; int max, pass; LIST_HEAD(add_list); acpiphp_rescan_slot(slot); max = acpiphp_max_busnr(bus); for (pass = 0; pass < 2; pass++) { list_for_each_entry(dev, &bus->devices, bus_list) { if (PCI_SLOT(dev->devfn) != slot->device) continue; if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE || dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) { 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); acpiphp_set_hpp_values(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 (!dev->is_added) 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; } } } /* return first device in slot, acquiring a reference on it */ static struct pci_dev *dev_in_slot(struct acpiphp_slot *slot) { struct pci_bus *bus = slot->bus; struct pci_dev *dev; struct pci_dev *ret = NULL; down_read(&pci_bus_sem); list_for_each_entry(dev, &bus->devices, bus_list) if (PCI_SLOT(dev->devfn) == slot->device) { ret = pci_dev_get(dev); break; } up_read(&pci_bus_sem); return ret; } /** * disable_slot - disable a slot * @slot: ACPI PHP slot */ static void disable_slot(struct acpiphp_slot *slot) { struct acpiphp_func *func; struct pci_dev *pdev; /* * 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. */ while ((pdev = dev_in_slot(slot))) { pci_stop_and_remove_bus_device(pdev); pci_dev_put(pdev); } list_for_each_entry(func, &slot->funcs, sibling) acpiphp_bus_trim(func_to_handle(func)); slot->flags &= (~SLOT_ENABLED); } static bool acpiphp_no_hotplug(acpi_handle handle) { struct acpi_device *adev = NULL; acpi_bus_get_device(handle, &adev); return adev && adev->flags.no_hotplug; } static bool slot_no_hotplug(struct acpiphp_slot *slot) { struct acpiphp_func *func; list_for_each_entry(func, &slot->funcs, sibling) if (acpiphp_no_hotplug(func_to_handle(func))) 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; 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 { u32 dvid; pci_bus_read_config_dword(slot->bus, PCI_DEVFN(slot->device, func->function), PCI_VENDOR_ID, &dvid); if (dvid != 0xffffffff) { sta = ACPI_STA_ALL; break; } } } 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) { acpi_handle handle = ACPI_HANDLE(&dev->dev); struct pci_bus *bus = dev->subordinate; bool alive = false; if (handle) { acpi_status status; unsigned long long sta; status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); alive = (ACPI_SUCCESS(status) && device_status_valid(sta)) || acpiphp_no_hotplug(handle); } if (!alive) { u32 v; /* Check if the device responds. */ alive = pci_bus_read_dev_vendor_id(dev->bus, dev->devfn, &v, 0); } if (!alive) { pci_stop_and_remove_bus_device(dev); if (handle) acpiphp_bus_trim(handle); } 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(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; list_for_each_entry(slot, &bridge->slots, node) { struct pci_bus *bus = slot->bus; struct pci_dev *dev, *tmp; mutex_lock(&slot->crit_sect); 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(dev, tmp, &bus->devices, bus_list) if (PCI_SLOT(dev->devfn) == slot->device) trim_stale_devices(dev); /* configure all functions */ enable_slot(slot); } else { disable_slot(slot); } mutex_unlock(&slot->crit_sect); } } static void acpiphp_set_hpp_values(struct pci_bus *bus) { struct pci_dev *dev; list_for_each_entry(dev, &bus->devices, bus_list) pci_configure_slot(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(dev, tmp, &bus->devices, bus_list) { for (i=0; iresource[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(acpi_handle handle) { struct acpiphp_bridge *bridge; bridge = acpiphp_handle_to_bridge(handle); if (bridge) { acpiphp_check_bridge(bridge); put_bridge(bridge); } } static void hotplug_event(acpi_handle handle, u32 type, void *data) { struct acpiphp_context *context = data; struct acpiphp_func *func = &context->func; struct acpiphp_bridge *bridge; char objname[64]; struct acpi_buffer buffer = { .length = sizeof(objname), .pointer = objname }; mutex_lock(&acpiphp_context_lock); bridge = context->bridge; if (bridge) get_bridge(bridge); mutex_unlock(&acpiphp_context_lock); acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); switch (type) { case ACPI_NOTIFY_BUS_CHECK: /* bus re-enumerate */ dbg("%s: Bus check notify on %s\n", __func__, objname); dbg("%s: re-enumerating slots under %s\n", __func__, objname); if (bridge) { acpiphp_check_bridge(bridge); } else { struct acpiphp_slot *slot = func->slot; mutex_lock(&slot->crit_sect); enable_slot(slot); mutex_unlock(&slot->crit_sect); } break; case ACPI_NOTIFY_DEVICE_CHECK: /* device check */ dbg("%s: Device check notify on %s\n", __func__, objname); if (bridge) { acpiphp_check_bridge(bridge); } else { struct acpiphp_slot *slot = func->slot; int ret; /* * Check if anything has changed in the slot and rescan * from the parent if that's the case. */ mutex_lock(&slot->crit_sect); ret = acpiphp_rescan_slot(slot); mutex_unlock(&slot->crit_sect); if (ret) acpiphp_check_bridge(func->parent); } break; case ACPI_NOTIFY_EJECT_REQUEST: /* request device eject */ dbg("%s: Device eject notify on %s\n", __func__, objname); acpiphp_disable_and_eject_slot(func->slot); break; } if (bridge) put_bridge(bridge); } static void hotplug_event_work(struct work_struct *work) { struct acpiphp_context *context; struct acpi_hp_work *hp_work; hp_work = container_of(work, struct acpi_hp_work, work); context = hp_work->context; acpi_scan_lock_acquire(); hotplug_event(hp_work->handle, hp_work->type, context); acpi_scan_lock_release(); acpi_evaluate_hotplug_ost(hp_work->handle, hp_work->type, ACPI_OST_SC_SUCCESS, NULL); kfree(hp_work); /* allocated in handle_hotplug_event() */ put_bridge(context->func.parent); } /** * handle_hotplug_event - handle ACPI hotplug event * @handle: Notify()'ed acpi_handle * @type: Notify code * @data: pointer to acpiphp_context structure * * Handles ACPI event notification on slots. */ static void handle_hotplug_event(acpi_handle handle, u32 type, void *data) { struct acpiphp_context *context; u32 ost_code = ACPI_OST_SC_SUCCESS; switch (type) { case ACPI_NOTIFY_BUS_CHECK: case ACPI_NOTIFY_DEVICE_CHECK: break; case ACPI_NOTIFY_EJECT_REQUEST: ost_code = ACPI_OST_SC_EJECT_IN_PROGRESS; acpi_evaluate_hotplug_ost(handle, type, ost_code, NULL); break; case ACPI_NOTIFY_DEVICE_WAKE: return; case ACPI_NOTIFY_FREQUENCY_MISMATCH: acpi_handle_err(handle, "Device cannot be configured due " "to a frequency mismatch\n"); goto out; case ACPI_NOTIFY_BUS_MODE_MISMATCH: acpi_handle_err(handle, "Device cannot be configured due " "to a bus mode mismatch\n"); goto out; case ACPI_NOTIFY_POWER_FAULT: acpi_handle_err(handle, "Device has suffered a power fault\n"); goto out; default: acpi_handle_warn(handle, "Unsupported event type 0x%x\n", type); ost_code = ACPI_OST_SC_UNRECOGNIZED_NOTIFY; goto out; } mutex_lock(&acpiphp_context_lock); context = acpiphp_get_context(handle); if (context) { get_bridge(context->func.parent); acpiphp_put_context(context); alloc_acpi_hp_work(handle, type, context, hotplug_event_work); mutex_unlock(&acpiphp_context_lock); return; } mutex_unlock(&acpiphp_context_lock); ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; out: acpi_evaluate_hotplug_ost(handle, type, ost_code, NULL); } /* * Create hotplug slots for the PCI bus. * It should always return 0 to avoid skipping following notifiers. */ void acpiphp_enumerate_slots(struct pci_bus *bus) { struct acpiphp_bridge *bridge; acpi_handle handle; acpi_status status; if (acpiphp_disabled) return; handle = ACPI_HANDLE(bus->bridge); if (!handle) return; bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL); if (!bridge) { acpi_handle_err(handle, "No memory for bridge object\n"); 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); if (!pci_is_root_bus(bridge->pci_bus)) { 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. */ mutex_lock(&acpiphp_context_lock); context = acpiphp_get_context(handle); if (!context) { mutex_unlock(&acpiphp_context_lock); put_device(&bus->dev); pci_dev_put(bridge->pci_dev); kfree(bridge); return; } bridge->context = context; context->bridge = bridge; /* Get a reference to the parent bridge. */ get_bridge(context->func.parent); mutex_unlock(&acpiphp_context_lock); } /* must be added to the list prior to calling register_slot */ 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, register_slot, NULL, bridge, NULL); if (ACPI_FAILURE(status)) { acpi_handle_err(handle, "failed to register slots\n"); cleanup_bridge(bridge); put_bridge(bridge); } } /* Destroy hotplug slots associated with the PCI bus */ 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); cleanup_bridge(bridge); put_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) { mutex_lock(&slot->crit_sect); /* configure all functions */ if (!(slot->flags & SLOT_ENABLED)) enable_slot(slot); mutex_unlock(&slot->crit_sect); return 0; } /** * acpiphp_disable_and_eject_slot - power off and eject slot * @slot: ACPI PHP slot */ int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot) { struct acpiphp_func *func; int retval = 0; mutex_lock(&slot->crit_sect); /* 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; } mutex_unlock(&slot->crit_sect); return retval; } /* * 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); }