/* * 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 "../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_func(acpi_handle handle, u32 type, void *context); static void free_bridge(struct kref *kref); /* callback routine to check for the existence of a pci dock device */ static acpi_status is_pci_dock_device(acpi_handle handle, u32 lvl, void *context, void **rv) { int *count = (int *)context; if (is_dock_device(handle)) { (*count)++; return AE_CTRL_TERMINATE; } else { return AE_OK; } } 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->func || 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) { context = func->context; context->func = NULL; acpiphp_put_context(context); kfree(func); } kfree(slot); } context = bridge->context; /* Release the reference acquired by acpiphp_enumerate_slots(). */ if (context->handler_for_func) put_bridge(bridge->func->slot->bridge); put_device(&bridge->pci_bus->dev); pci_dev_put(bridge->pci_dev); context->bridge = NULL; acpiphp_put_context(context); 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_func *func = data; struct pci_bus *bus = func->slot->bridge->pci_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_func, }; /* 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_func *func = data; get_bridge(func->slot->bridge); } static void acpiphp_dock_release(void *data) { struct acpiphp_func *func = data; put_bridge(func->slot->bridge); } /* 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, sun; int device, function, retval, found = 0; struct pci_bus *pbus = bridge->pci_bus; struct pci_dev *pdev; u32 val; if (!acpi_pci_check_ejectable(pbus, handle) && !is_dock_device(handle)) return AE_OK; status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr); if (ACPI_FAILURE(status)) { warn("can't evaluate _ADR (%#x)\n", status); return AE_OK; } device = (adr >> 16) & 0xffff; function = adr & 0xffff; pdev = bridge->pci_dev; if (pdev && device_is_managed_by_native_pciehp(pdev)) return AE_OK; newfunc = kzalloc(sizeof(struct acpiphp_func), GFP_KERNEL); if (!newfunc) return AE_NO_MEMORY; newfunc->handle = handle; newfunc->function = function; 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"); kfree(newfunc); return AE_NOT_EXIST; } newfunc->context = context; context->func = newfunc; 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, "_PS0")) newfunc->flags |= FUNC_HAS_PS0; if (acpi_has_method(handle, "_PS3")) newfunc->flags |= FUNC_HAS_PS3; if (acpi_has_method(handle, "_DCK")) newfunc->flags |= FUNC_HAS_DCK; status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun); if (ACPI_FAILURE(status)) { /* * use the count of the number of slots we've found * for the number of the slot */ sun = bridge->nr_slots+1; } /* search for objects that share the same slot */ list_for_each_entry(slot, &bridge->slots, node) if (slot->device == device) { if (slot->sun != sun) warn("sibling found, but _SUN doesn't match!\n"); found = 1; break; } if (!found) { slot = kzalloc(sizeof(struct acpiphp_slot), GFP_KERNEL); if (!slot) { status = AE_NO_MEMORY; goto err_out; } slot->bridge = bridge; slot->device = device; slot->sun = sun; INIT_LIST_HEAD(&slot->funcs); mutex_init(&slot->crit_sect); mutex_lock(&bridge_mutex); list_add_tail(&slot->node, &bridge->slots); mutex_unlock(&bridge_mutex); bridge->nr_slots++; dbg("found ACPI PCI Hotplug slot %llu at PCI %04x:%02x:%02x\n", slot->sun, pci_domain_nr(pbus), pbus->number, device); retval = acpiphp_register_hotplug_slot(slot); if (retval) { if (retval == -EBUSY) warn("Slot %llu already registered by another " "hotplug driver\n", slot->sun); else warn("acpiphp_register_hotplug_slot failed " "(err code = 0x%x)\n", retval); status = AE_OK; goto err; } } newfunc->slot = slot; mutex_lock(&bridge_mutex); list_add_tail(&newfunc->sibling, &slot->funcs); mutex_unlock(&bridge_mutex); if (pci_bus_read_dev_vendor_id(pbus, PCI_DEVFN(device, function), &val, 60*1000)) slot->flags |= (SLOT_ENABLED | SLOT_POWEREDON); 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, newfunc, 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_SUCCESS(status)) context->handler_for_func = true; else err("failed to register interrupt notify handler\n"); } return AE_OK; err: bridge->nr_slots--; mutex_lock(&bridge_mutex); list_del(&slot->node); mutex_unlock(&bridge_mutex); kfree(slot); err_out: mutex_lock(&acpiphp_context_lock); context->func = NULL; acpiphp_put_context(context); mutex_unlock(&acpiphp_context_lock); kfree(newfunc); return status; } /* see if it's worth looking at this bridge */ static int detect_ejectable_slots(acpi_handle handle) { int found = acpi_pci_detect_ejectable(handle); if (!found) { acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1, is_pci_dock_device, NULL, (void *)&found, NULL); } return found; } static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle) { struct acpiphp_bridge *bridge; mutex_lock(&bridge_mutex); list_for_each_entry(bridge, &bridge_list, list) if (bridge->handle == handle) { get_bridge(bridge); mutex_unlock(&bridge_mutex); return bridge; } mutex_unlock(&bridge_mutex); return NULL; } static void cleanup_bridge(struct acpiphp_bridge *bridge) { struct acpiphp_slot *slot; struct acpiphp_func *func; acpi_status status; acpi_handle handle = bridge->handle; if (!bridge->context->handler_for_func) { status = acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY, handle_hotplug_event); if (ACPI_FAILURE(status)) err("failed to remove notify handler\n"); } list_for_each_entry(slot, &bridge->slots, node) { list_for_each_entry(func, &slot->funcs, sibling) { if (is_dock_device(func->handle)) { unregister_hotplug_dock_device(func->handle); } if (!(func->flags & FUNC_HAS_DCK)) { func->context->handler_for_func = false; status = acpi_remove_notify_handler(func->handle, ACPI_SYSTEM_NOTIFY, handle_hotplug_event); if (ACPI_FAILURE(status)) err("failed to remove notify handler\n"); } } acpiphp_unregister_hotplug_slot(slot); } mutex_lock(&bridge_mutex); list_del(&bridge->list); mutex_unlock(&bridge_mutex); } static int power_on_slot(struct acpiphp_slot *slot) { acpi_status status; struct acpiphp_func *func; int retval = 0; /* if already enabled, just skip */ if (slot->flags & SLOT_POWEREDON) goto err_exit; list_for_each_entry(func, &slot->funcs, sibling) { if (func->flags & FUNC_HAS_PS0) { dbg("%s: executing _PS0\n", __func__); status = acpi_evaluate_object(func->handle, "_PS0", NULL, NULL); if (ACPI_FAILURE(status)) { warn("%s: _PS0 failed\n", __func__); retval = -1; goto err_exit; } else break; } } /* TBD: evaluate _STA to check if the slot is enabled */ slot->flags |= SLOT_POWEREDON; err_exit: return retval; } static int power_off_slot(struct acpiphp_slot *slot) { acpi_status status; struct acpiphp_func *func; int retval = 0; /* if already disabled, just skip */ if ((slot->flags & SLOT_POWEREDON) == 0) goto err_exit; list_for_each_entry(func, &slot->funcs, sibling) { if (func->flags & FUNC_HAS_PS3) { status = acpi_evaluate_object(func->handle, "_PS3", NULL, NULL); if (ACPI_FAILURE(status)) { warn("%s: _PS3 failed\n", __func__); retval = -1; goto err_exit; } else break; } } /* TBD: evaluate _STA to check if the slot is disabled */ slot->flags &= (~SLOT_POWEREDON); err_exit: return retval; } /** * 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_add - add a new bus to acpi subsystem * @func: acpiphp_func of the bridge */ static int acpiphp_bus_add(struct acpiphp_func *func) { struct acpi_device *device; int ret_val; if (!acpi_bus_get_device(func->handle, &device)) { dbg("bus exists... trim\n"); /* this shouldn't be in here, so remove * the bus then re-add it... */ acpi_bus_trim(device); } ret_val = acpi_bus_scan(func->handle); if (!ret_val) ret_val = acpi_bus_get_device(func->handle, &device); if (ret_val) dbg("error adding bus, %x\n", -ret_val); return ret_val; } /** * acpiphp_bus_trim - trim a bus from acpi subsystem * @handle: handle to acpi namespace */ static int acpiphp_bus_trim(acpi_handle handle) { struct acpi_device *device; int retval; retval = acpi_bus_get_device(handle, &device); if (retval) { dbg("acpi_device not found\n"); return retval; } acpi_bus_trim(device); return 0; } 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->handle, "_REG", &arg_list, NULL); } } static void check_hotplug_bridge(struct acpiphp_slot *slot, struct pci_dev *dev) { struct acpiphp_func *func; if (!dev->subordinate) return; /* quirk, or pcie could set it already */ if (dev->is_hotplug_bridge) return; if (PCI_SLOT(dev->devfn) != slot->device) return; list_for_each_entry(func, &slot->funcs, sibling) { if (PCI_FUNC(dev->devfn) == func->function) { /* check if this bridge has ejectable slots */ if ((detect_ejectable_slots(func->handle) > 0)) dev->is_hotplug_bridge = 1; break; } } } /** * enable_device - 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 int __ref enable_device(struct acpiphp_slot *slot) { struct pci_dev *dev; struct pci_bus *bus = slot->bridge->pci_bus; struct acpiphp_func *func; int num, max, pass; LIST_HEAD(add_list); if (slot->flags & SLOT_ENABLED) goto err_exit; list_for_each_entry(func, &slot->funcs, sibling) acpiphp_bus_add(func); num = pci_scan_slot(bus, PCI_DEVFN(slot->device, 0)); if (num == 0) { /* Maybe only part of funcs are added. */ dbg("No new device found\n"); goto err_exit; } 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); pci_enable_bridges(bus); 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; } } err_exit: return 0; } /* 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->bridge->pci_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_device - disable a slot * @slot: ACPI PHP slot */ static int disable_device(struct acpiphp_slot *slot) { struct acpiphp_func *func; struct pci_dev *pdev; /* * enable_device() 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->handle); } slot->flags &= (~SLOT_ENABLED); return 0; } /** * 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) { acpi_status status; unsigned long long sta = 0; u32 dvid; struct acpiphp_func *func; list_for_each_entry(func, &slot->funcs, sibling) { if (func->flags & FUNC_HAS_STA) { status = acpi_evaluate_integer(func->handle, "_STA", NULL, &sta); if (ACPI_SUCCESS(status) && sta) break; } else { pci_bus_read_config_dword(slot->bridge->pci_bus, PCI_DEVFN(slot->device, func->function), PCI_VENDOR_ID, &dvid); if (dvid != 0xffffffff) { sta = ACPI_STA_ALL; break; } } } return (unsigned int)sta; } /** * acpiphp_eject_slot - physically eject the slot * @slot: ACPI PHP slot */ int acpiphp_eject_slot(struct acpiphp_slot *slot) { struct acpiphp_func *func; list_for_each_entry(func, &slot->funcs, sibling) { /* We don't want to call _EJ0 on non-existing functions. */ if ((func->flags & FUNC_HAS_EJ0)) { if (ACPI_FAILURE(acpi_evaluate_ej0(func->handle))) return -1; else break; } } return 0; } /** * 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 int acpiphp_check_bridge(struct acpiphp_bridge *bridge) { struct acpiphp_slot *slot; int retval = 0; int enabled, disabled; enabled = disabled = 0; list_for_each_entry(slot, &bridge->slots, node) { unsigned int status = get_slot_status(slot); if (slot->flags & SLOT_ENABLED) { if (status == ACPI_STA_ALL) continue; retval = acpiphp_disable_slot(slot); if (retval) { err("Error occurred in disabling\n"); goto err_exit; } else { acpiphp_eject_slot(slot); } disabled++; } else { if (status != ACPI_STA_ALL) continue; retval = acpiphp_enable_slot(slot); if (retval) { err("Error occurred in enabling\n"); goto err_exit; } enabled++; } } dbg("%s: %d enabled, %d disabled\n", __func__, enabled, disabled); err_exit: return retval; } 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 */ static acpi_status check_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv) { struct acpiphp_bridge *bridge; char objname[64]; struct acpi_buffer buffer = { .length = sizeof(objname), .pointer = objname }; bridge = acpiphp_handle_to_bridge(handle); if (bridge) { acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); dbg("%s: re-enumerating slots under %s\n", __func__, objname); acpiphp_check_bridge(bridge); put_bridge(bridge); } return AE_OK ; } 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); } acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, ACPI_UINT32_MAX, check_sub_bridges, NULL, NULL, NULL); } static void _handle_hotplug_event_bridge(struct work_struct *work) { struct acpiphp_bridge *bridge; char objname[64]; struct acpi_buffer buffer = { .length = sizeof(objname), .pointer = objname }; struct acpi_hp_work *hp_work; acpi_handle handle; u32 type; hp_work = container_of(work, struct acpi_hp_work, work); handle = hp_work->handle; type = hp_work->type; bridge = (struct acpiphp_bridge *)hp_work->context; acpi_scan_lock_acquire(); 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); acpiphp_check_bridge(bridge); acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, ACPI_UINT32_MAX, check_sub_bridges, NULL, NULL, NULL); break; case ACPI_NOTIFY_DEVICE_CHECK: /* device check */ dbg("%s: Device check notify on %s\n", __func__, objname); acpiphp_check_bridge(bridge); break; case ACPI_NOTIFY_DEVICE_WAKE: /* wake event */ dbg("%s: Device wake notify on %s\n", __func__, objname); break; case ACPI_NOTIFY_EJECT_REQUEST: /* request device eject */ dbg("%s: Device eject notify on %s\n", __func__, objname); if ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func) { struct acpiphp_slot *slot; slot = bridge->func->slot; if (!acpiphp_disable_slot(slot)) acpiphp_eject_slot(slot); } break; case ACPI_NOTIFY_FREQUENCY_MISMATCH: printk(KERN_ERR "Device %s cannot be configured due" " to a frequency mismatch\n", objname); break; case ACPI_NOTIFY_BUS_MODE_MISMATCH: printk(KERN_ERR "Device %s cannot be configured due" " to a bus mode mismatch\n", objname); break; case ACPI_NOTIFY_POWER_FAULT: printk(KERN_ERR "Device %s has suffered a power fault\n", objname); break; default: warn("notify_handler: unknown event type 0x%x for %s\n", type, objname); break; } acpi_scan_lock_release(); kfree(hp_work); /* allocated in handle_hotplug_event_bridge */ put_bridge(bridge); } static void hotplug_event_func(acpi_handle handle, u32 type, void *context) { struct acpiphp_func *func = context; char objname[64]; struct acpi_buffer buffer = { .length = sizeof(objname), .pointer = objname }; 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); acpiphp_enable_slot(func->slot); break; case ACPI_NOTIFY_DEVICE_CHECK: /* device check : re-enumerate from parent bus */ dbg("%s: Device check notify on %s\n", __func__, objname); acpiphp_check_bridge(func->slot->bridge); break; case ACPI_NOTIFY_DEVICE_WAKE: /* wake event */ dbg("%s: Device wake notify on %s\n", __func__, objname); break; case ACPI_NOTIFY_EJECT_REQUEST: /* request device eject */ dbg("%s: Device eject notify on %s\n", __func__, objname); if (!(acpiphp_disable_slot(func->slot))) acpiphp_eject_slot(func->slot); break; default: warn("notify_handler: unknown event type 0x%x for %s\n", type, objname); break; } } static void _handle_hotplug_event_func(struct work_struct *work) { struct acpi_hp_work *hp_work; struct acpiphp_func *func; hp_work = container_of(work, struct acpi_hp_work, work); func = hp_work->context; acpi_scan_lock_acquire(); hotplug_event_func(hp_work->handle, hp_work->type, func); acpi_scan_lock_release(); kfree(hp_work); /* allocated in handle_hotplug_event_func */ put_bridge(func->slot->bridge); } /** * 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; void (*work_func)(struct work_struct *work) = NULL; mutex_lock(&acpiphp_context_lock); context = acpiphp_get_context(handle); if (context) { if (context->bridge) { get_bridge(context->bridge); data = context->bridge; work_func = _handle_hotplug_event_bridge; } else if (context->func) { get_bridge(context->func->slot->bridge); data = context->func; work_func = _handle_hotplug_event_func; } acpiphp_put_context(context); } mutex_unlock(&acpiphp_context_lock); /* * Currently the code adds all hotplug events to the kacpid_wq * queue when it should add hotplug events to the kacpi_hotplug_wq. * The proper way to fix this is to reorganize the code so that * drivers (dock, etc.) do not call acpi_os_execute(), etc. * For now just re-add this work to the kacpi_hotplug_wq so we * don't deadlock on hotplug actions. */ if (work_func) alloc_acpi_hp_work(handle, type, data, work_func); } /* * 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_context *context; struct acpiphp_bridge *bridge; acpi_handle handle; acpi_status status; if (acpiphp_disabled) return; handle = ACPI_HANDLE(bus->bridge); if (!handle || detect_ejectable_slots(handle) <= 0) 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->handle = handle; bridge->pci_dev = pci_dev_get(bus->self); bridge->pci_bus = bus; mutex_lock(&acpiphp_context_lock); context = acpiphp_get_context(handle); if (!context) { context = acpiphp_init_context(handle); if (!context) { mutex_unlock(&acpiphp_context_lock); acpi_handle_err(handle, "No hotplug context\n"); kfree(bridge); return; } } bridge->context = context; context->bridge = bridge; mutex_unlock(&acpiphp_context_lock); /* * 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); /* 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, bridge->handle, 1, register_slot, NULL, bridge, NULL); if (ACPI_FAILURE(status)) { acpi_handle_err(bridge->handle, "failed to register slots\n"); goto err; } if (pci_is_root_bus(bridge->pci_bus)) return; if (acpi_has_method(bridge->handle, "_EJ0")) { dbg("found ejectable p2p bridge\n"); bridge->flags |= BRIDGE_HAS_EJ0; } if (context->handler_for_func) { /* Notify handler already installed. */ bridge->func = context->func; get_bridge(context->func->slot->bridge); return; } /* install notify handler for P2P bridges */ status = acpi_install_notify_handler(bridge->handle, ACPI_SYSTEM_NOTIFY, handle_hotplug_event, NULL); if (ACPI_SUCCESS(status)) return; acpi_handle_err(bridge->handle, "failed to register notify handler\n"); err: 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, *tmp; if (acpiphp_disabled) return; list_for_each_entry_safe(bridge, tmp, &bridge_list, list) if (bridge->pci_bus == bus) { cleanup_bridge(bridge); put_bridge(bridge); break; } } /** * acpiphp_enable_slot - power on slot * @slot: ACPI PHP slot */ int acpiphp_enable_slot(struct acpiphp_slot *slot) { int retval; mutex_lock(&slot->crit_sect); /* wake up all functions */ retval = power_on_slot(slot); if (retval) goto err_exit; if (get_slot_status(slot) == ACPI_STA_ALL) { /* configure all functions */ retval = enable_device(slot); if (retval) power_off_slot(slot); } else { dbg("%s: Slot status is not ACPI_STA_ALL\n", __func__); power_off_slot(slot); } err_exit: mutex_unlock(&slot->crit_sect); return retval; } /** * acpiphp_disable_slot - power off slot * @slot: ACPI PHP slot */ int acpiphp_disable_slot(struct acpiphp_slot *slot) { int retval = 0; mutex_lock(&slot->crit_sect); /* unconfigure all functions */ retval = disable_device(slot); if (retval) goto err_exit; /* power off all functions */ retval = power_off_slot(slot); if (retval) goto err_exit; err_exit: 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_POWEREDON); } /* * latch open: 1 * latch closed: 0 */ u8 acpiphp_get_latch_status(struct acpiphp_slot *slot) { unsigned int sta; sta = get_slot_status(slot); return (sta & ACPI_STA_DEVICE_UI) ? 0 : 1; } /* * adapter presence : 1 * absence : 0 */ u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot) { unsigned int sta; sta = get_slot_status(slot); return (sta == 0) ? 0 : 1; }