| /* |
| * 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 <kristen.c.accardi@intel.com> |
| * |
| */ |
| |
| /* |
| * Lifetime rules for pci_dev: |
| * - The one in acpiphp_func has its refcount elevated by pci_get_slot() |
| * when the driver is loaded or when an insertion event occurs. It loses |
| * a refcount when its ejected or the driver unloads. |
| * - 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 <linux/init.h> |
| #include <linux/module.h> |
| |
| #include <linux/kernel.h> |
| #include <linux/pci.h> |
| #include <linux/pci_hotplug.h> |
| #include <linux/pci-acpi.h> |
| #include <linux/mutex.h> |
| |
| #include "../pci.h" |
| #include "acpiphp.h" |
| |
| static LIST_HEAD(bridge_list); |
| static LIST_HEAD(ioapic_list); |
| static DEFINE_SPINLOCK(ioapic_list_lock); |
| |
| #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(acpi_handle handle, 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 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; |
| |
| 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); |
| |
| /* associate corresponding pci_dev */ |
| newfunc->pci_dev = pci_get_slot(pbus, PCI_DEVFN(device, function)); |
| if (newfunc->pci_dev) { |
| 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)) |
| 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(struct pci_bus *pbus) |
| { |
| int found = acpi_pci_detect_ejectable(pbus); |
| if (!found) { |
| acpi_handle bridge_handle = acpi_pci_get_bridge_handle(pbus); |
| if (!bridge_handle) |
| return 0; |
| acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge_handle, (u32)1, |
| is_pci_dock_device, (void *)&found, NULL); |
| } |
| return found; |
| } |
| |
| |
| /* decode ACPI 2.0 _HPP hot plug parameters */ |
| static void decode_hpp(struct acpiphp_bridge *bridge) |
| { |
| acpi_status status; |
| |
| status = acpi_get_hp_params_from_firmware(bridge->pci_bus, &bridge->hpp); |
| if (ACPI_FAILURE(status) || |
| !bridge->hpp.t0 || (bridge->hpp.t0->revision > 1)) { |
| /* use default numbers */ |
| printk(KERN_WARNING |
| "%s: Could not get hotplug parameters. Use defaults\n", |
| __func__); |
| bridge->hpp.t0 = &bridge->hpp.type0_data; |
| bridge->hpp.t0->revision = 0; |
| bridge->hpp.t0->cache_line_size = 0x10; |
| bridge->hpp.t0->latency_timer = 0x40; |
| bridge->hpp.t0->enable_serr = 0; |
| bridge->hpp.t0->enable_perr = 0; |
| } |
| } |
| |
| |
| |
| /* initialize miscellaneous stuff for both root and PCI-to-PCI bridge */ |
| static void init_bridge_misc(struct acpiphp_bridge *bridge) |
| { |
| acpi_status status; |
| |
| /* decode ACPI 2.0 _HPP (hot plug parameters) */ |
| decode_hpp(bridge); |
| |
| /* 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, 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 list_head *node, *l; |
| struct acpiphp_bridge *bridge; |
| struct acpiphp_slot *slot; |
| struct acpiphp_func *func; |
| |
| list_for_each(node, &bridge_list) { |
| bridge = list_entry(node, struct acpiphp_bridge, list); |
| for (slot = bridge->slots; slot; slot = slot->next) { |
| list_for_each(l, &slot->funcs) { |
| func = list_entry(l, struct acpiphp_func, |
| 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 pci_bus *pci_bus) |
| { |
| struct acpiphp_bridge *bridge; |
| |
| bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL); |
| if (bridge == NULL) |
| return; |
| |
| bridge->type = BRIDGE_TYPE_HOST; |
| bridge->handle = handle; |
| |
| bridge->pci_bus = pci_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 pci_dev *pci_dev) |
| { |
| 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 = pci_dev_get(pci_dev); |
| bridge->pci_bus = 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(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; |
| acpi_handle dummy_handle; |
| unsigned long long tmp; |
| int device, function; |
| struct pci_dev *dev; |
| struct pci_bus *pci_bus = context; |
| |
| status = acpi_get_handle(handle, "_ADR", &dummy_handle); |
| if (ACPI_FAILURE(status)) |
| return AE_OK; /* continue */ |
| |
| status = acpi_evaluate_integer(handle, "_ADR", NULL, &tmp); |
| if (ACPI_FAILURE(status)) { |
| dbg("%s: _ADR evaluation failure\n", __func__); |
| return AE_OK; |
| } |
| |
| device = (tmp >> 16) & 0xffff; |
| function = tmp & 0xffff; |
| |
| dev = pci_get_slot(pci_bus, PCI_DEVFN(device, function)); |
| |
| if (!dev || !dev->subordinate) |
| goto out; |
| |
| /* check if this bridge has ejectable slots */ |
| if ((detect_ejectable_slots(dev->subordinate) > 0)) { |
| dbg("found PCI-to-PCI bridge at PCI %s\n", pci_name(dev)); |
| add_p2p_bridge(handle, dev); |
| } |
| |
| /* search P2P bridges under this p2p bridge */ |
| status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1, |
| find_p2p_bridge, dev->subordinate, 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; |
| int seg, bus; |
| acpi_handle dummy_handle; |
| struct pci_bus *pci_bus; |
| |
| /* 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; |
| } |
| |
| /* get PCI segment number */ |
| status = acpi_evaluate_integer(handle, "_SEG", NULL, &tmp); |
| |
| seg = ACPI_SUCCESS(status) ? tmp : 0; |
| |
| /* get PCI bus number */ |
| status = acpi_evaluate_integer(handle, "_BBN", NULL, &tmp); |
| |
| if (ACPI_SUCCESS(status)) { |
| bus = tmp; |
| } else { |
| warn("can't get bus number, assuming 0\n"); |
| bus = 0; |
| } |
| |
| pci_bus = pci_find_bus(seg, bus); |
| if (!pci_bus) { |
| err("Can't find bus %04x:%02x\n", seg, bus); |
| return 0; |
| } |
| |
| /* check if this bridge has ejectable slots */ |
| if (detect_ejectable_slots(pci_bus) > 0) { |
| dbg("found PCI host-bus bridge with hot-pluggable slots\n"); |
| add_host_bridge(handle, pci_bus); |
| } |
| |
| /* search P2P bridges under this host bridge */ |
| status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1, |
| find_p2p_bridge, pci_bus, 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 list_head *head; |
| list_for_each(head, &bridge_list) { |
| struct acpiphp_bridge *bridge = list_entry(head, |
| struct acpiphp_bridge, list); |
| if (bridge->handle == handle) |
| return bridge; |
| } |
| |
| return NULL; |
| } |
| |
| static void cleanup_bridge(struct acpiphp_bridge *bridge) |
| { |
| struct list_head *list, *tmp; |
| struct acpiphp_slot *slot; |
| 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) { |
| struct acpiphp_slot *next = slot->next; |
| list_for_each_safe (list, tmp, &slot->funcs) { |
| struct acpiphp_func *func; |
| func = list_entry(list, struct acpiphp_func, 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"); |
| } |
| pci_dev_put(func->pci_dev); |
| list_del(list); |
| 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); |
| |
| 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); |
| |
| /* |
| * On root bridges with hotplug slots directly underneath (ie, |
| * no p2p bridge inbetween), 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 struct pci_dev * get_apic_pci_info(acpi_handle handle) |
| { |
| struct acpi_pci_id id; |
| struct pci_bus *bus; |
| struct pci_dev *dev; |
| |
| if (ACPI_FAILURE(acpi_get_pci_id(handle, &id))) |
| return NULL; |
| |
| bus = pci_find_bus(id.segment, id.bus); |
| if (!bus) |
| return NULL; |
| |
| dev = pci_get_slot(bus, PCI_DEVFN(id.device, id.function)); |
| if (!dev) |
| return NULL; |
| |
| if ((dev->class != PCI_CLASS_SYSTEM_PIC_IOAPIC) && |
| (dev->class != PCI_CLASS_SYSTEM_PIC_IOXAPIC)) |
| { |
| pci_dev_put(dev); |
| return NULL; |
| } |
| |
| return dev; |
| } |
| |
| static int get_gsi_base(acpi_handle handle, u32 *gsi_base) |
| { |
| acpi_status status; |
| int result = -1; |
| unsigned long long gsb; |
| struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; |
| union acpi_object *obj; |
| void *table; |
| |
| status = acpi_evaluate_integer(handle, "_GSB", NULL, &gsb); |
| if (ACPI_SUCCESS(status)) { |
| *gsi_base = (u32)gsb; |
| return 0; |
| } |
| |
| status = acpi_evaluate_object(handle, "_MAT", NULL, &buffer); |
| if (ACPI_FAILURE(status) || !buffer.length || !buffer.pointer) |
| return -1; |
| |
| obj = buffer.pointer; |
| if (obj->type != ACPI_TYPE_BUFFER) |
| goto out; |
| |
| table = obj->buffer.pointer; |
| switch (((struct acpi_subtable_header *)table)->type) { |
| case ACPI_MADT_TYPE_IO_SAPIC: |
| *gsi_base = ((struct acpi_madt_io_sapic *)table)->global_irq_base; |
| result = 0; |
| break; |
| case ACPI_MADT_TYPE_IO_APIC: |
| *gsi_base = ((struct acpi_madt_io_apic *)table)->global_irq_base; |
| result = 0; |
| break; |
| default: |
| break; |
| } |
| out: |
| kfree(buffer.pointer); |
| return result; |
| } |
| |
| static acpi_status |
| ioapic_add(acpi_handle handle, u32 lvl, void *context, void **rv) |
| { |
| acpi_status status; |
| unsigned long long sta; |
| acpi_handle tmp; |
| struct pci_dev *pdev; |
| u32 gsi_base; |
| u64 phys_addr; |
| struct acpiphp_ioapic *ioapic; |
| |
| /* Evaluate _STA if present */ |
| status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); |
| if (ACPI_SUCCESS(status) && sta != ACPI_STA_ALL) |
| return AE_CTRL_DEPTH; |
| |
| /* Scan only PCI bus scope */ |
| status = acpi_get_handle(handle, "_HID", &tmp); |
| if (ACPI_SUCCESS(status)) |
| return AE_CTRL_DEPTH; |
| |
| if (get_gsi_base(handle, &gsi_base)) |
| return AE_OK; |
| |
| ioapic = kmalloc(sizeof(*ioapic), GFP_KERNEL); |
| if (!ioapic) |
| return AE_NO_MEMORY; |
| |
| pdev = get_apic_pci_info(handle); |
| if (!pdev) |
| goto exit_kfree; |
| |
| if (pci_enable_device(pdev)) |
| goto exit_pci_dev_put; |
| |
| pci_set_master(pdev); |
| |
| if (pci_request_region(pdev, 0, "I/O APIC(acpiphp)")) |
| goto exit_pci_disable_device; |
| |
| phys_addr = pci_resource_start(pdev, 0); |
| if (acpi_register_ioapic(handle, phys_addr, gsi_base)) |
| goto exit_pci_release_region; |
| |
| ioapic->gsi_base = gsi_base; |
| ioapic->dev = pdev; |
| spin_lock(&ioapic_list_lock); |
| list_add_tail(&ioapic->list, &ioapic_list); |
| spin_unlock(&ioapic_list_lock); |
| |
| return AE_OK; |
| |
| exit_pci_release_region: |
| pci_release_region(pdev, 0); |
| exit_pci_disable_device: |
| pci_disable_device(pdev); |
| exit_pci_dev_put: |
| pci_dev_put(pdev); |
| exit_kfree: |
| kfree(ioapic); |
| |
| return AE_OK; |
| } |
| |
| static acpi_status |
| ioapic_remove(acpi_handle handle, u32 lvl, void *context, void **rv) |
| { |
| acpi_status status; |
| unsigned long long sta; |
| acpi_handle tmp; |
| u32 gsi_base; |
| struct acpiphp_ioapic *pos, *n, *ioapic = NULL; |
| |
| /* Evaluate _STA if present */ |
| status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); |
| if (ACPI_SUCCESS(status) && sta != ACPI_STA_ALL) |
| return AE_CTRL_DEPTH; |
| |
| /* Scan only PCI bus scope */ |
| status = acpi_get_handle(handle, "_HID", &tmp); |
| if (ACPI_SUCCESS(status)) |
| return AE_CTRL_DEPTH; |
| |
| if (get_gsi_base(handle, &gsi_base)) |
| return AE_OK; |
| |
| acpi_unregister_ioapic(handle, gsi_base); |
| |
| spin_lock(&ioapic_list_lock); |
| list_for_each_entry_safe(pos, n, &ioapic_list, list) { |
| if (pos->gsi_base != gsi_base) |
| continue; |
| ioapic = pos; |
| list_del(&ioapic->list); |
| break; |
| } |
| spin_unlock(&ioapic_list_lock); |
| |
| if (!ioapic) |
| return AE_OK; |
| |
| pci_release_region(ioapic->dev, 0); |
| pci_disable_device(ioapic->dev); |
| pci_dev_put(ioapic->dev); |
| kfree(ioapic); |
| |
| return AE_OK; |
| } |
| |
| static int acpiphp_configure_ioapics(acpi_handle handle) |
| { |
| ioapic_add(handle, 0, NULL, NULL); |
| acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, |
| ACPI_UINT32_MAX, ioapic_add, NULL, NULL); |
| return 0; |
| } |
| |
| static int acpiphp_unconfigure_ioapics(acpi_handle handle) |
| { |
| ioapic_remove(handle, 0, NULL, NULL); |
| acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, |
| ACPI_UINT32_MAX, ioapic_remove, NULL, NULL); |
| return 0; |
| } |
| |
| static int power_on_slot(struct acpiphp_slot *slot) |
| { |
| acpi_status status; |
| struct acpiphp_func *func; |
| struct list_head *l; |
| int retval = 0; |
| |
| /* if already enabled, just skip */ |
| if (slot->flags & SLOT_POWEREDON) |
| goto err_exit; |
| |
| list_for_each (l, &slot->funcs) { |
| func = list_entry(l, struct acpiphp_func, 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; |
| struct list_head *l; |
| |
| int retval = 0; |
| |
| /* if already disabled, just skip */ |
| if ((slot->flags & SLOT_POWEREDON) == 0) |
| goto err_exit; |
| |
| list_for_each (l, &slot->funcs) { |
| func = list_entry(l, struct acpiphp_func, 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; |
| } |
| /* |
| * try to start anyway. We could have failed to add |
| * simply because this bus had previously been added |
| * on another add. Don't bother with the return value |
| * we just keep going. |
| */ |
| 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; |
| } |
| |
| /** |
| * 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 list_head *l; |
| 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 (l, &slot->funcs) { |
| func = list_entry(l, struct acpiphp_func, sibling); |
| acpiphp_bus_add(func); |
| } |
| |
| pci_bus_assign_resources(bus); |
| acpiphp_sanitize_bus(bus); |
| acpiphp_set_hpp_values(slot->bridge->handle, bus); |
| list_for_each_entry(func, &slot->funcs, sibling) |
| acpiphp_configure_ioapics(func->handle); |
| pci_enable_bridges(bus); |
| pci_bus_add_devices(bus); |
| |
| /* associate pci_dev to our representation */ |
| list_for_each (l, &slot->funcs) { |
| func = list_entry(l, struct acpiphp_func, sibling); |
| func->pci_dev = pci_get_slot(bus, PCI_DEVFN(slot->device, |
| func->function)); |
| if (!func->pci_dev) |
| continue; |
| |
| if (func->pci_dev->hdr_type != PCI_HEADER_TYPE_BRIDGE && |
| func->pci_dev->hdr_type != PCI_HEADER_TYPE_CARDBUS) |
| 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); |
| } |
| |
| 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) |
| { |
| int retval = 0; |
| struct acpiphp_func *func; |
| struct list_head *l; |
| |
| /* is this slot already disabled? */ |
| if (!(slot->flags & SLOT_ENABLED)) |
| goto err_exit; |
| |
| list_for_each (l, &slot->funcs) { |
| func = list_entry(l, struct acpiphp_func, sibling); |
| |
| if (func->bridge) { |
| /* cleanup p2p bridges under this P2P bridge */ |
| cleanup_p2p_bridge(func->bridge->handle, |
| (u32)1, NULL, NULL); |
| func->bridge = NULL; |
| } |
| |
| if (func->pci_dev) { |
| pci_stop_bus_device(func->pci_dev); |
| if (func->pci_dev->subordinate) { |
| disable_bridges(func->pci_dev->subordinate); |
| pci_disable_device(func->pci_dev); |
| } |
| } |
| } |
| |
| list_for_each (l, &slot->funcs) { |
| func = list_entry(l, struct acpiphp_func, sibling); |
| |
| acpiphp_unconfigure_ioapics(func->handle); |
| acpiphp_bus_trim(func->handle); |
| /* try to remove anyway. |
| * acpiphp_bus_add might have been failed */ |
| |
| if (!func->pci_dev) |
| continue; |
| |
| pci_remove_bus_device(func->pci_dev); |
| pci_dev_put(func->pci_dev); |
| func->pci_dev = NULL; |
| } |
| |
| slot->flags &= (~SLOT_ENABLED); |
| |
| err_exit: |
| return retval; |
| } |
| |
| |
| /** |
| * 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 list_head *l; |
| struct acpiphp_func *func; |
| |
| list_for_each (l, &slot->funcs) { |
| func = list_entry(l, struct acpiphp_func, 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 list_head *l; |
| struct acpi_object_list arg_list; |
| union acpi_object arg; |
| |
| list_for_each (l, &slot->funcs) { |
| func = list_entry(l, struct acpiphp_func, 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 program_hpp(struct pci_dev *dev, struct acpiphp_bridge *bridge) |
| { |
| u16 pci_cmd, pci_bctl; |
| struct pci_dev *cdev; |
| |
| /* Program hpp values for this device */ |
| if (!(dev->hdr_type == PCI_HEADER_TYPE_NORMAL || |
| (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE && |
| (dev->class >> 8) == PCI_CLASS_BRIDGE_PCI))) |
| return; |
| |
| if ((dev->class >> 8) == PCI_CLASS_BRIDGE_HOST) |
| return; |
| |
| pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, |
| bridge->hpp.t0->cache_line_size); |
| pci_write_config_byte(dev, PCI_LATENCY_TIMER, |
| bridge->hpp.t0->latency_timer); |
| pci_read_config_word(dev, PCI_COMMAND, &pci_cmd); |
| if (bridge->hpp.t0->enable_serr) |
| pci_cmd |= PCI_COMMAND_SERR; |
| else |
| pci_cmd &= ~PCI_COMMAND_SERR; |
| if (bridge->hpp.t0->enable_perr) |
| pci_cmd |= PCI_COMMAND_PARITY; |
| else |
| pci_cmd &= ~PCI_COMMAND_PARITY; |
| pci_write_config_word(dev, PCI_COMMAND, pci_cmd); |
| |
| /* Program bridge control value and child devices */ |
| if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) { |
| pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER, |
| bridge->hpp.t0->latency_timer); |
| pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &pci_bctl); |
| if (bridge->hpp.t0->enable_serr) |
| pci_bctl |= PCI_BRIDGE_CTL_SERR; |
| else |
| pci_bctl &= ~PCI_BRIDGE_CTL_SERR; |
| if (bridge->hpp.t0->enable_perr) |
| pci_bctl |= PCI_BRIDGE_CTL_PARITY; |
| else |
| pci_bctl &= ~PCI_BRIDGE_CTL_PARITY; |
| pci_write_config_word(dev, PCI_BRIDGE_CONTROL, pci_bctl); |
| if (dev->subordinate) { |
| list_for_each_entry(cdev, &dev->subordinate->devices, |
| bus_list) |
| program_hpp(cdev, bridge); |
| } |
| } |
| } |
| |
| static void acpiphp_set_hpp_values(acpi_handle handle, struct pci_bus *bus) |
| { |
| struct acpiphp_bridge bridge; |
| struct pci_dev *dev; |
| |
| memset(&bridge, 0, sizeof(bridge)); |
| bridge.handle = handle; |
| bridge.pci_bus = bus; |
| bridge.pci_dev = bus->self; |
| decode_hpp(&bridge); |
| list_for_each_entry(dev, &bus->devices, bus_list) |
| program_hpp(dev, &bridge); |
| |
| } |
| |
| /* |
| * 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; i<PCI_BRIDGE_RESOURCES; i++) { |
| struct resource *res = &dev->resource[i]; |
| if ((res->flags & type_mask) && !res->start && |
| res->end) { |
| /* Could not assign a required resources |
| * for this device, remove it */ |
| pci_remove_bus_device(dev); |
| break; |
| } |
| } |
| } |
| } |
| |
| /* Program resources in newly inserted bridge */ |
| static int acpiphp_configure_bridge (acpi_handle handle) |
| { |
| struct acpi_pci_id pci_id; |
| struct pci_bus *bus; |
| |
| if (ACPI_FAILURE(acpi_get_pci_id(handle, &pci_id))) { |
| err("cannot get PCI domain and bus number for bridge\n"); |
| return -EINVAL; |
| } |
| bus = pci_find_bus(pci_id.segment, pci_id.bus); |
| if (!bus) { |
| err("cannot find bus %d:%d\n", |
| pci_id.segment, pci_id.bus); |
| return -EINVAL; |
| } |
| |
| pci_bus_size_bridges(bus); |
| pci_bus_assign_resources(bus); |
| acpiphp_sanitize_bus(bus); |
| acpiphp_set_hpp_values(handle, bus); |
| pci_enable_bridges(bus); |
| acpiphp_configure_ioapics(handle); |
| 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 ; |
| } |
| |
| /** |
| * 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) |
| { |
| 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; |
| |
| if (acpi_bus_get_device(handle, &device)) { |
| /* This bridge must have just been physically inserted */ |
| handle_bridge_insertion(handle, type); |
| return; |
| } |
| |
| 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, &num_sub_bridges, NULL); |
| } |
| |
| if (!bridge && !num_sub_bridges) { |
| err("cannot get bridge info\n"); |
| return; |
| } |
| |
| 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); |
| 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; |
| } |
| } |
| |
| /** |
| * 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) |
| { |
| struct acpiphp_func *func; |
| char objname[64]; |
| struct acpi_buffer buffer = { .length = sizeof(objname), |
| .pointer = objname }; |
| |
| 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; |
| } |
| } |
| |
| |
| static acpi_status |
| find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv) |
| { |
| int *count = (int *)context; |
| |
| if (acpi_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, &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; |
| } |