/* * 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); #define MY_NAME "acpiphp_glue" static void handle_hotplug_event_bridge (acpi_handle, u32, void *); static void acpiphp_sanitize_bus(struct pci_bus *bus); static void acpiphp_set_hpp_values(struct pci_bus *bus); static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context); /* 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; } } /* * 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 int post_dock_fixups(struct notifier_block *nb, unsigned long val, void *v) { struct acpiphp_func *func = container_of(nb, struct acpiphp_func, nb); struct pci_bus *bus = func->slot->bridge->pci_bus; u32 buses; if (!bus->self) return NOTIFY_OK; /* 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->secondary) { buses = (buses & 0xff000000) | ((unsigned int)(bus->primary) << 0) | ((unsigned int)(bus->secondary) << 8) | ((unsigned int)(bus->subordinate) << 16); pci_write_config_dword(bus->self, PCI_PRIMARY_BUS, buses); } return NOTIFY_OK; } static const struct acpi_dock_ops acpiphp_dock_ops = { .handler = handle_hotplug_event_func, }; /* callback routine to register each ACPI PCI slot object */ static acpi_status register_slot(acpi_handle handle, u32 lvl, void *context, void **rv) { struct acpiphp_bridge *bridge = (struct acpiphp_bridge *)context; struct acpiphp_slot *slot; struct acpiphp_func *newfunc; acpi_handle tmp; acpi_status status = AE_OK; unsigned long long adr, sun; int device, function, retval; struct pci_bus *pbus = bridge->pci_bus; struct pci_dev *pdev; if (!acpi_pci_check_ejectable(pbus, handle) && !is_dock_device(handle)) return AE_OK; acpi_evaluate_integer(handle, "_ADR", NULL, &adr); device = (adr >> 16) & 0xffff; function = adr & 0xffff; newfunc = kzalloc(sizeof(struct acpiphp_func), GFP_KERNEL); if (!newfunc) return AE_NO_MEMORY; INIT_LIST_HEAD(&newfunc->sibling); newfunc->handle = handle; newfunc->function = function; if (ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp))) newfunc->flags = FUNC_HAS_EJ0; if (ACPI_SUCCESS(acpi_get_handle(handle, "_STA", &tmp))) newfunc->flags |= FUNC_HAS_STA; if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS0", &tmp))) newfunc->flags |= FUNC_HAS_PS0; if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS3", &tmp))) newfunc->flags |= FUNC_HAS_PS3; if (ACPI_SUCCESS(acpi_get_handle(handle, "_DCK", &tmp))) 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 */ for (slot = bridge->slots; slot; slot = slot->next) if (slot->device == device) { if (slot->sun != sun) warn("sibling found, but _SUN doesn't match!\n"); break; } if (!slot) { slot = kzalloc(sizeof(struct acpiphp_slot), GFP_KERNEL); if (!slot) { kfree(newfunc); return AE_NO_MEMORY; } slot->bridge = bridge; slot->device = device; slot->sun = sun; INIT_LIST_HEAD(&slot->funcs); mutex_init(&slot->crit_sect); slot->next = bridge->slots; bridge->slots = slot; 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); goto err_exit; } } newfunc->slot = slot; list_add_tail(&newfunc->sibling, &slot->funcs); pdev = pci_get_slot(pbus, PCI_DEVFN(device, function)); if (pdev) { pdev->current_state = PCI_D0; slot->flags |= (SLOT_ENABLED | SLOT_POWEREDON); pci_dev_put(pdev); } 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)) dbg("failed to register dock device\n"); /* we need to be notified when dock events happen * outside of the hotplug operation, since we may * need to do fixups before we can hotplug. */ newfunc->nb.notifier_call = post_dock_fixups; if (register_dock_notifier(&newfunc->nb)) dbg("failed to register a dock notifier"); } /* install notify handler */ if (!(newfunc->flags & FUNC_HAS_DCK)) { status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, handle_hotplug_event_func, newfunc); if (ACPI_FAILURE(status)) err("failed to register interrupt notify handler\n"); } else status = AE_OK; return status; err_exit: bridge->nr_slots--; bridge->slots = slot->next; kfree(slot); kfree(newfunc); return AE_OK; } /* 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; } /* initialize miscellaneous stuff for both root and PCI-to-PCI bridge */ static void init_bridge_misc(struct acpiphp_bridge *bridge) { acpi_status status; /* must be added to the list prior to calling register_slot */ list_add(&bridge->list, &bridge_list); /* register all slot objects under this bridge */ status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge->handle, (u32)1, register_slot, NULL, bridge, NULL); if (ACPI_FAILURE(status)) { list_del(&bridge->list); return; } /* install notify handler */ if (bridge->type != BRIDGE_TYPE_HOST) { if ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func) { status = acpi_remove_notify_handler(bridge->func->handle, ACPI_SYSTEM_NOTIFY, handle_hotplug_event_func); if (ACPI_FAILURE(status)) err("failed to remove notify handler\n"); } status = acpi_install_notify_handler(bridge->handle, ACPI_SYSTEM_NOTIFY, handle_hotplug_event_bridge, bridge); if (ACPI_FAILURE(status)) { err("failed to register interrupt notify handler\n"); } } } /* find acpiphp_func from acpiphp_bridge */ static struct acpiphp_func *acpiphp_bridge_handle_to_function(acpi_handle handle) { struct acpiphp_bridge *bridge; struct acpiphp_slot *slot; struct acpiphp_func *func; list_for_each_entry(bridge, &bridge_list, list) { for (slot = bridge->slots; slot; slot = slot->next) { list_for_each_entry(func, &slot->funcs, sibling) { if (func->handle == handle) return func; } } } return NULL; } static inline void config_p2p_bridge_flags(struct acpiphp_bridge *bridge) { acpi_handle dummy_handle; if (ACPI_SUCCESS(acpi_get_handle(bridge->handle, "_STA", &dummy_handle))) bridge->flags |= BRIDGE_HAS_STA; if (ACPI_SUCCESS(acpi_get_handle(bridge->handle, "_EJ0", &dummy_handle))) bridge->flags |= BRIDGE_HAS_EJ0; if (ACPI_SUCCESS(acpi_get_handle(bridge->handle, "_PS0", &dummy_handle))) bridge->flags |= BRIDGE_HAS_PS0; if (ACPI_SUCCESS(acpi_get_handle(bridge->handle, "_PS3", &dummy_handle))) bridge->flags |= BRIDGE_HAS_PS3; /* is this ejectable p2p bridge? */ if (bridge->flags & BRIDGE_HAS_EJ0) { struct acpiphp_func *func; dbg("found ejectable p2p bridge\n"); /* make link between PCI bridge and PCI function */ func = acpiphp_bridge_handle_to_function(bridge->handle); if (!func) return; bridge->func = func; func->bridge = bridge; } } /* allocate and initialize host bridge data structure */ static void add_host_bridge(acpi_handle *handle) { struct acpiphp_bridge *bridge; struct acpi_pci_root *root = acpi_pci_find_root(handle); bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL); if (bridge == NULL) return; bridge->type = BRIDGE_TYPE_HOST; bridge->handle = handle; bridge->pci_bus = root->bus; spin_lock_init(&bridge->res_lock); init_bridge_misc(bridge); } /* allocate and initialize PCI-to-PCI bridge data structure */ static void add_p2p_bridge(acpi_handle *handle) { struct acpiphp_bridge *bridge; bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL); if (bridge == NULL) { err("out of memory\n"); return; } bridge->type = BRIDGE_TYPE_P2P; bridge->handle = handle; config_p2p_bridge_flags(bridge); bridge->pci_dev = acpi_get_pci_dev(handle); bridge->pci_bus = bridge->pci_dev->subordinate; if (!bridge->pci_bus) { err("This is not a PCI-to-PCI bridge!\n"); goto err; } /* * 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(&bridge->pci_bus->dev); spin_lock_init(&bridge->res_lock); init_bridge_misc(bridge); return; err: pci_dev_put(bridge->pci_dev); kfree(bridge); return; } /* callback routine to find P2P bridges */ static acpi_status find_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv) { acpi_status status; struct pci_dev *dev; dev = acpi_get_pci_dev(handle); if (!dev || !dev->subordinate) goto out; /* check if this bridge has ejectable slots */ if ((detect_ejectable_slots(handle) > 0)) { dbg("found PCI-to-PCI bridge at PCI %s\n", pci_name(dev)); add_p2p_bridge(handle); } /* search P2P bridges under this p2p bridge */ status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1, find_p2p_bridge, NULL, NULL, NULL); if (ACPI_FAILURE(status)) warn("find_p2p_bridge failed (error code = 0x%x)\n", status); out: pci_dev_put(dev); return AE_OK; } /* find hot-pluggable slots, and then find P2P bridge */ static int add_bridge(acpi_handle handle) { acpi_status status; unsigned long long tmp; acpi_handle dummy_handle; /* if the bridge doesn't have _STA, we assume it is always there */ status = acpi_get_handle(handle, "_STA", &dummy_handle); if (ACPI_SUCCESS(status)) { status = acpi_evaluate_integer(handle, "_STA", NULL, &tmp); if (ACPI_FAILURE(status)) { dbg("%s: _STA evaluation failure\n", __func__); return 0; } if ((tmp & ACPI_STA_FUNCTIONING) == 0) /* don't register this object */ return 0; } /* check if this bridge has ejectable slots */ if (detect_ejectable_slots(handle) > 0) { dbg("found PCI host-bus bridge with hot-pluggable slots\n"); add_host_bridge(handle); } /* search P2P bridges under this host bridge */ status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1, find_p2p_bridge, NULL, NULL, NULL); if (ACPI_FAILURE(status)) warn("find_p2p_bridge failed (error code = 0x%x)\n", status); return 0; } static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle) { struct acpiphp_bridge *bridge; list_for_each_entry(bridge, &bridge_list, list) if (bridge->handle == handle) return bridge; return NULL; } static void cleanup_bridge(struct acpiphp_bridge *bridge) { struct acpiphp_slot *slot, *next; struct acpiphp_func *func, *tmp; acpi_status status; acpi_handle handle = bridge->handle; status = acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY, handle_hotplug_event_bridge); if (ACPI_FAILURE(status)) err("failed to remove notify handler\n"); if ((bridge->type != BRIDGE_TYPE_HOST) && ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func)) { status = acpi_install_notify_handler(bridge->func->handle, ACPI_SYSTEM_NOTIFY, handle_hotplug_event_func, bridge->func); if (ACPI_FAILURE(status)) err("failed to install interrupt notify handler\n"); } slot = bridge->slots; while (slot) { next = slot->next; list_for_each_entry_safe(func, tmp, &slot->funcs, sibling) { if (is_dock_device(func->handle)) { unregister_hotplug_dock_device(func->handle); unregister_dock_notifier(&func->nb); } if (!(func->flags & FUNC_HAS_DCK)) { status = acpi_remove_notify_handler(func->handle, ACPI_SYSTEM_NOTIFY, handle_hotplug_event_func); if (ACPI_FAILURE(status)) err("failed to remove notify handler\n"); } list_del(&func->sibling); kfree(func); } acpiphp_unregister_hotplug_slot(slot); list_del(&slot->funcs); kfree(slot); slot = next; } /* * Only P2P bridges have a pci_dev */ if (bridge->pci_dev) put_device(&bridge->pci_bus->dev); pci_dev_put(bridge->pci_dev); list_del(&bridge->list); kfree(bridge); } static acpi_status cleanup_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv) { struct acpiphp_bridge *bridge; /* cleanup p2p bridges under this P2P bridge in a depth-first manner */ acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1, cleanup_p2p_bridge, NULL, NULL, NULL); bridge = acpiphp_handle_to_bridge(handle); if (bridge) cleanup_bridge(bridge); return AE_OK; } static void remove_bridge(acpi_handle handle) { struct acpiphp_bridge *bridge; /* cleanup p2p bridges under this host bridge in a depth-first manner */ acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1, cleanup_p2p_bridge, NULL, NULL, NULL); /* * On root bridges with hotplug slots directly underneath (ie, * no p2p bridge between), we call cleanup_bridge(). * * The else clause cleans up root bridges that either had no * hotplug slots at all, or had a p2p bridge underneath. */ bridge = acpiphp_handle_to_bridge(handle); if (bridge) cleanup_bridge(bridge); else acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY, handle_hotplug_event_bridge); } 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->secondary; 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) { acpi_handle phandle; struct acpi_device *device, *pdevice; int ret_val; acpi_get_parent(func->handle, &phandle); if (acpi_bus_get_device(phandle, &pdevice)) { dbg("no parent device, assuming NULL\n"); pdevice = NULL; } 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... */ ret_val = acpi_bus_trim(device, 1); dbg("acpi_bus_trim return %x\n", ret_val); } ret_val = acpi_bus_add(&device, pdevice, func->handle, ACPI_BUS_TYPE_DEVICE); if (ret_val) { dbg("error adding bus, %x\n", -ret_val); goto acpiphp_bus_add_out; } ret_val = acpi_bus_start(device); acpiphp_bus_add_out: 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; } retval = acpi_bus_trim(device, 1); if (retval) err("cannot remove from acpi list\n"); return retval; } 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); } } /** * 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 retval = 0; int num, max, pass; acpi_status status; if (slot->flags & SLOT_ENABLED) goto err_exit; /* sanity check: dev should be NULL when hot-plugged in */ dev = pci_get_slot(bus, PCI_DEVFN(slot->device, 0)); if (dev) { /* This case shouldn't happen */ err("pci_dev structure already exists.\n"); pci_dev_put(dev); retval = -1; goto err_exit; } num = pci_scan_slot(bus, PCI_DEVFN(slot->device, 0)); if (num == 0) { err("No new device found\n"); retval = -1; 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) pci_bus_size_bridges(dev->subordinate); } } } list_for_each_entry(func, &slot->funcs, sibling) acpiphp_bus_add(func); pci_bus_assign_resources(bus); 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); list_for_each_entry(func, &slot->funcs, sibling) { dev = pci_get_slot(bus, PCI_DEVFN(slot->device, func->function)); if (!dev) continue; if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE && dev->hdr_type != PCI_HEADER_TYPE_CARDBUS) { pci_dev_put(dev); continue; } status = find_p2p_bridge(func->handle, (u32)1, bus, NULL); if (ACPI_FAILURE(status)) warn("find_p2p_bridge failed (error code = 0x%x)\n", status); pci_dev_put(dev); } slot->flags |= SLOT_ENABLED; err_exit: return retval; } static void disable_bridges(struct pci_bus *bus) { struct pci_dev *dev; list_for_each_entry(dev, &bus->devices, bus_list) { if (dev->subordinate) { disable_bridges(dev->subordinate); pci_disable_device(dev); } } } /** * 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; /* is this slot already disabled? */ if (!(slot->flags & SLOT_ENABLED)) goto err_exit; list_for_each_entry(func, &slot->funcs, sibling) { if (func->bridge) { /* cleanup p2p bridges under this P2P bridge */ cleanup_p2p_bridge(func->bridge->handle, (u32)1, NULL, NULL); func->bridge = NULL; } pdev = pci_get_slot(slot->bridge->pci_bus, PCI_DEVFN(slot->device, func->function)); if (pdev) { pci_stop_bus_device(pdev); if (pdev->subordinate) { disable_bridges(pdev->subordinate); pci_disable_device(pdev); } pci_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); err_exit: 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) { acpi_status status; struct acpiphp_func *func; struct acpi_object_list arg_list; union acpi_object arg; 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)) { /* _EJ0 method take one argument */ arg_list.count = 1; arg_list.pointer = &arg; arg.type = ACPI_TYPE_INTEGER; arg.integer.value = 1; status = acpi_evaluate_object(func->handle, "_EJ0", &arg_list, NULL); if (ACPI_FAILURE(status)) { warn("%s: _EJ0 failed\n", __func__); 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; for (slot = bridge->slots; slot; slot = slot->next) { 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; int i; unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM; list_for_each_entry(dev, &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_remove_bus_device(dev); break; } } } } /* Program resources in newly inserted bridge */ static int acpiphp_configure_bridge (acpi_handle handle) { struct pci_bus *bus; if (acpi_is_root_bridge(handle)) { struct acpi_pci_root *root = acpi_pci_find_root(handle); bus = root->bus; } else { struct pci_dev *pdev = acpi_get_pci_dev(handle); bus = pdev->subordinate; pci_dev_put(pdev); } pci_bus_size_bridges(bus); pci_bus_assign_resources(bus); acpiphp_sanitize_bus(bus); acpiphp_set_hpp_values(bus); pci_enable_bridges(bus); return 0; } static void handle_bridge_insertion(acpi_handle handle, u32 type) { struct acpi_device *device, *pdevice; acpi_handle phandle; if ((type != ACPI_NOTIFY_BUS_CHECK) && (type != ACPI_NOTIFY_DEVICE_CHECK)) { err("unexpected notification type %d\n", type); return; } acpi_get_parent(handle, &phandle); if (acpi_bus_get_device(phandle, &pdevice)) { dbg("no parent device, assuming NULL\n"); pdevice = NULL; } if (acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE)) { err("cannot add bridge to acpi list\n"); return; } if (!acpiphp_configure_bridge(handle) && !acpi_bus_start(device)) add_bridge(handle); else err("cannot configure and start bridge\n"); } /* * ACPI event handlers */ static acpi_status count_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv) { int *count = (int *)context; struct acpiphp_bridge *bridge; bridge = acpiphp_handle_to_bridge(handle); if (bridge) (*count)++; return AE_OK ; } 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); } return AE_OK ; } struct acpiphp_hp_work { struct work_struct work; acpi_handle handle; u32 type; void *context; }; static void alloc_acpiphp_hp_work(acpi_handle handle, u32 type, void *context, void (*func)(struct work_struct *work)) { struct acpiphp_hp_work *hp_work; int ret; hp_work = kmalloc(sizeof(*hp_work), GFP_KERNEL); if (!hp_work) return; hp_work->handle = handle; hp_work->type = type; hp_work->context = context; INIT_WORK(&hp_work->work, func); ret = queue_work(kacpi_hotplug_wq, &hp_work->work); if (!ret) kfree(hp_work); } 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_device *device; int num_sub_bridges = 0; struct acpiphp_hp_work *hp_work; acpi_handle handle; u32 type; hp_work = container_of(work, struct acpiphp_hp_work, work); handle = hp_work->handle; type = hp_work->type; if (acpi_bus_get_device(handle, &device)) { /* This bridge must have just been physically inserted */ handle_bridge_insertion(handle, type); goto out; } bridge = acpiphp_handle_to_bridge(handle); if (type == ACPI_NOTIFY_BUS_CHECK) { acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, ACPI_UINT32_MAX, count_sub_bridges, NULL, &num_sub_bridges, NULL); } if (!bridge && !num_sub_bridges) { err("cannot get bridge info\n"); goto out; } 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); if (bridge) { dbg("%s: re-enumerating slots under %s\n", __func__, objname); acpiphp_check_bridge(bridge); } if (num_sub_bridges) 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->type != BRIDGE_TYPE_HOST) && (bridge->flags & BRIDGE_HAS_EJ0)) { 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; } out: kfree(hp_work); /* allocated in handle_hotplug_event_bridge */ } /** * handle_hotplug_event_bridge - handle ACPI event on bridges * @handle: Notify()'ed acpi_handle * @type: Notify code * @context: pointer to acpiphp_bridge structure * * Handles ACPI event notification on {host,p2p} bridges. */ static void handle_hotplug_event_bridge(acpi_handle handle, u32 type, void *context) { /* * 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. */ alloc_acpiphp_hp_work(handle, type, context, _handle_hotplug_event_bridge); } static void _handle_hotplug_event_func(struct work_struct *work) { struct acpiphp_func *func; char objname[64]; struct acpi_buffer buffer = { .length = sizeof(objname), .pointer = objname }; struct acpiphp_hp_work *hp_work; acpi_handle handle; u32 type; void *context; hp_work = container_of(work, struct acpiphp_hp_work, work); handle = hp_work->handle; type = hp_work->type; context = hp_work->context; acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); func = (struct acpiphp_func *)context; 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; } kfree(hp_work); /* allocated in handle_hotplug_event_func */ } /** * handle_hotplug_event_func - handle ACPI event on functions (i.e. slots) * @handle: Notify()'ed acpi_handle * @type: Notify code * @context: pointer to acpiphp_func structure * * Handles ACPI event notification on slots. */ static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context) { /* * 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. */ alloc_acpiphp_hp_work(handle, type, context, _handle_hotplug_event_func); } static acpi_status find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv) { int *count = (int *)context; if (acpi_is_root_bridge(handle)) { acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, handle_hotplug_event_bridge, NULL); (*count)++; } return AE_OK ; } static struct acpi_pci_driver acpi_pci_hp_driver = { .add = add_bridge, .remove = remove_bridge, }; /** * acpiphp_glue_init - initializes all PCI hotplug - ACPI glue data structures */ int __init acpiphp_glue_init(void) { int num = 0; acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, ACPI_UINT32_MAX, find_root_bridges, NULL, &num, NULL); if (num <= 0) return -1; else acpi_pci_register_driver(&acpi_pci_hp_driver); return 0; } /** * acpiphp_glue_exit - terminates all PCI hotplug - ACPI glue data structures * * This function frees all data allocated in acpiphp_glue_init(). */ void acpiphp_glue_exit(void) { acpi_pci_unregister_driver(&acpi_pci_hp_driver); } /** * acpiphp_get_num_slots - count number of slots in a system */ int __init acpiphp_get_num_slots(void) { struct acpiphp_bridge *bridge; int num_slots = 0; list_for_each_entry(bridge, &bridge_list, list) { dbg("Bus %04x:%02x has %d slot%s\n", pci_domain_nr(bridge->pci_bus), bridge->pci_bus->number, bridge->nr_slots, bridge->nr_slots == 1 ? "" : "s"); num_slots += bridge->nr_slots; } dbg("Total %d slots\n", num_slots); return num_slots; } #if 0 /** * acpiphp_for_each_slot - call function for each slot * @fn: callback function * @data: context to be passed to callback function */ static int acpiphp_for_each_slot(acpiphp_callback fn, void *data) { struct list_head *node; struct acpiphp_bridge *bridge; struct acpiphp_slot *slot; int retval = 0; list_for_each (node, &bridge_list) { bridge = (struct acpiphp_bridge *)node; for (slot = bridge->slots; slot; slot = slot->next) { retval = fn(slot, data); if (!retval) goto err_exit; } } err_exit: return retval; } #endif /** * 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_SHOW_IN_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; }