Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 1344 insertions, 0 deletions

diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c
new file mode 100644
index 000000000000..e7f41294f811
--- /dev/null
+++ b/drivers/pci/hotplug/acpiphp_glue.c
@@ -0,0 +1,1344 @@
+/*
+ * 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
+ *
+ * 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 <t-kochi@bq.jp.nec.com>
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/smp_lock.h>
+#include <asm/semaphore.h>
+
+#include "../pci.h"
+#include "pci_hotplug.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 handle_hotplug_event_func (acpi_handle, u32, void *);
+
+/*
+ * initialization & terminatation routines
+ */
+
+/**
+ * is_ejectable - determine if a slot is ejectable
+ * @handle: handle to acpi namespace
+ *
+ * Ejectable slot should satisfy at least these conditions:
+ *
+ *  1. has _ADR method
+ *  2. has _EJ0 method
+ *
+ * optionally
+ *
+ *  1. has _STA method
+ *  2. has _PS0 method
+ *  3. has _PS3 method
+ *  4. ..
+ *
+ */
+static int is_ejectable(acpi_handle handle)
+{
+        acpi_status status;
+        acpi_handle tmp;
+
+        status = acpi_get_handle(handle, "_ADR", &tmp);
+        if (ACPI_FAILURE(status)) {
+                return 0;
+        }
+
+        status = acpi_get_handle(handle, "_EJ0", &tmp);
+        if (ACPI_FAILURE(status)) {
+                return 0;
+        }
+
+        return 1;
+}
+
+
+/* callback routine to check the existence of ejectable slots */
+static acpi_status
+is_ejectable_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
+{
+        int *count = (int *)context;
+
+        if (is_ejectable(handle)) {
+                (*count)++;
+                /* only one ejectable slot is enough */
+                return AE_CTRL_TERMINATE;
+        } else {
+                return AE_OK;
+        }
+}
+
+
+/* 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 adr, sun;
+        int device, function;
+        static int num_slots = 0;       /* XXX if we support I/O node hotplug... */
+
+        status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr);
+
+        if (ACPI_FAILURE(status))
+                return AE_OK;
+
+        status = acpi_get_handle(handle, "_EJ0", &tmp);
+
+        if (ACPI_FAILURE(status))
+                return AE_OK;
+
+        device = (adr >> 16) & 0xffff;
+        function = adr & 0xffff;
+
+        newfunc = kmalloc(sizeof(struct acpiphp_func), GFP_KERNEL);
+        if (!newfunc)
+                return AE_NO_MEMORY;
+        memset(newfunc, 0, sizeof(struct acpiphp_func));
+
+        INIT_LIST_HEAD(&newfunc->sibling);
+        newfunc->handle = handle;
+        newfunc->function = function;
+        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;
+
+        status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun);
+        if (ACPI_FAILURE(status))
+                sun = -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 = kmalloc(sizeof(struct acpiphp_slot), GFP_KERNEL);
+                if (!slot) {
+                        kfree(newfunc);
+                        return AE_NO_MEMORY;
+                }
+
+                memset(slot, 0, sizeof(struct acpiphp_slot));
+                slot->bridge = bridge;
+                slot->id = num_slots++;
+                slot->device = device;
+                slot->sun = sun;
+                INIT_LIST_HEAD(&slot->funcs);
+                init_MUTEX(&slot->crit_sect);
+
+                slot->next = bridge->slots;
+                bridge->slots = slot;
+
+                bridge->nr_slots++;
+
+                dbg("found ACPI PCI Hotplug slot at PCI %02x:%02x Slot:%d\n",
+                    slot->bridge->bus, slot->device, slot->sun);
+        }
+
+        newfunc->slot = slot;
+        list_add_tail(&newfunc->sibling, &slot->funcs);
+
+        /* associate corresponding pci_dev */
+        newfunc->pci_dev = pci_find_slot(bridge->bus,
+                                         PCI_DEVFN(device, function));
+        if (newfunc->pci_dev) {
+                if (acpiphp_init_func_resource(newfunc) < 0) {
+                        kfree(newfunc);
+                        return AE_ERROR;
+                }
+                slot->flags |= (SLOT_ENABLED | SLOT_POWEREDON);
+        }
+
+        /* install notify handler */
+        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");
+                return status;
+        }
+
+        return AE_OK;
+}
+
+
+/* see if it's worth looking at this bridge */
+static int detect_ejectable_slots(acpi_handle *bridge_handle)
+{
+        acpi_status status;
+        int count;
+
+        count = 0;
+
+        /* only check slots defined directly below bridge object */
+        status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge_handle, (u32)1,
+                                     is_ejectable_slot, (void *)&count, NULL);
+
+        return count;
+}
+
+
+/* decode ACPI _CRS data and convert into our internal resource list
+ * TBD: _TRA, etc.
+ */
+static acpi_status
+decode_acpi_resource(struct acpi_resource *resource, void *context)
+{
+        struct acpiphp_bridge *bridge = (struct acpiphp_bridge *) context;
+        struct acpi_resource_address64 address;
+        struct pci_resource *res;
+
+        if (resource->id != ACPI_RSTYPE_ADDRESS16 &&
+            resource->id != ACPI_RSTYPE_ADDRESS32 &&
+            resource->id != ACPI_RSTYPE_ADDRESS64)
+                return AE_OK;
+
+        acpi_resource_to_address64(resource, &address);
+
+        if (address.producer_consumer == ACPI_PRODUCER && address.address_length > 0) {
+                dbg("resource type: %d: 0x%llx - 0x%llx\n", address.resource_type,
+                    (unsigned long long)address.min_address_range,
+                    (unsigned long long)address.max_address_range);
+                res = acpiphp_make_resource(address.min_address_range,
+                                    address.address_length);
+                if (!res) {
+                        err("out of memory\n");
+                        return AE_OK;
+                }
+
+                switch (address.resource_type) {
+                case ACPI_MEMORY_RANGE:
+                        if (address.attribute.memory.cache_attribute == ACPI_PREFETCHABLE_MEMORY) {
+                                res->next = bridge->p_mem_head;
+                                bridge->p_mem_head = res;
+                        } else {
+                                res->next = bridge->mem_head;
+                                bridge->mem_head = res;
+                        }
+                        break;
+                case ACPI_IO_RANGE:
+                        res->next = bridge->io_head;
+                        bridge->io_head = res;
+                        break;
+                case ACPI_BUS_NUMBER_RANGE:
+                        res->next = bridge->bus_head;
+                        bridge->bus_head = res;
+                        break;
+                default:
+                        /* invalid type */
+                        kfree(res);
+                        break;
+                }
+        }
+
+        return AE_OK;
+}
+
+/* decode ACPI 2.0 _HPP hot plug parameters */
+static void decode_hpp(struct acpiphp_bridge *bridge)
+{
+        acpi_status status;
+        struct acpi_buffer buffer = { .length = ACPI_ALLOCATE_BUFFER,
+                                      .pointer = NULL};
+        union acpi_object *package;
+        int i;
+
+        /* default numbers */
+        bridge->hpp.cache_line_size = 0x10;
+        bridge->hpp.latency_timer = 0x40;
+        bridge->hpp.enable_SERR = 0;
+        bridge->hpp.enable_PERR = 0;
+
+        status = acpi_evaluate_object(bridge->handle, "_HPP", NULL, &buffer);
+
+        if (ACPI_FAILURE(status)) {
+                dbg("_HPP evaluation failed\n");
+                return;
+        }
+
+        package = (union acpi_object *) buffer.pointer;
+
+        if (!package || package->type != ACPI_TYPE_PACKAGE ||
+            package->package.count != 4 || !package->package.elements) {
+                err("invalid _HPP object; ignoring\n");
+                goto err_exit;
+        }
+
+        for (i = 0; i < 4; i++) {
+                if (package->package.elements[i].type != ACPI_TYPE_INTEGER) {
+                        err("invalid _HPP parameter type; ignoring\n");
+                        goto err_exit;
+                }
+        }
+
+        bridge->hpp.cache_line_size = package->package.elements[0].integer.value;
+        bridge->hpp.latency_timer = package->package.elements[1].integer.value;
+        bridge->hpp.enable_SERR = package->package.elements[2].integer.value;
+        bridge->hpp.enable_PERR = package->package.elements[3].integer.value;
+
+        dbg("_HPP parameter = (%02x, %02x, %02x, %02x)\n",
+                bridge->hpp.cache_line_size,
+                bridge->hpp.latency_timer,
+                bridge->hpp.enable_SERR,
+                bridge->hpp.enable_PERR);
+
+        bridge->flags |= BRIDGE_HAS_HPP;
+
+ err_exit:
+        kfree(buffer.pointer);
+}
+
+
+/* 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);
+
+        /* subtract all resources already allocated */
+        acpiphp_detect_pci_resource(bridge);
+
+        /* register all slot objects under this bridge */
+        status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge->handle, (u32)1,
+                                     register_slot, bridge, NULL);
+
+        /* install notify handler */
+        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");
+        }
+
+        list_add(&bridge->list, &bridge_list);
+
+        dbg("Bridge resource:\n");
+        acpiphp_dump_resource(bridge);
+}
+
+
+/* allocate and initialize host bridge data structure */
+static void add_host_bridge(acpi_handle *handle, int seg, int bus)
+{
+        acpi_status status;
+        struct acpiphp_bridge *bridge;
+
+        bridge = kmalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
+        if (bridge == NULL)
+                return;
+
+        memset(bridge, 0, sizeof(struct acpiphp_bridge));
+
+        bridge->type = BRIDGE_TYPE_HOST;
+        bridge->handle = handle;
+        bridge->seg = seg;
+        bridge->bus = bus;
+
+        bridge->pci_bus = pci_find_bus(seg, bus);
+
+        spin_lock_init(&bridge->res_lock);
+
+        /* to be overridden when we decode _CRS */
+        bridge->sub = bridge->bus;
+
+        /* decode resources */
+
+        status = acpi_walk_resources(handle, METHOD_NAME__CRS,
+                decode_acpi_resource, bridge);
+
+        if (ACPI_FAILURE(status)) {
+                err("failed to decode bridge resources\n");
+                kfree(bridge);
+                return;
+        }
+
+        acpiphp_resource_sort_and_combine(&bridge->io_head);
+        acpiphp_resource_sort_and_combine(&bridge->mem_head);
+        acpiphp_resource_sort_and_combine(&bridge->p_mem_head);
+        acpiphp_resource_sort_and_combine(&bridge->bus_head);
+
+        dbg("ACPI _CRS resource:\n");
+        acpiphp_dump_resource(bridge);
+
+        if (bridge->bus_head) {
+                bridge->bus = bridge->bus_head->base;
+                bridge->sub = bridge->bus_head->base + bridge->bus_head->length - 1;
+        }
+
+        init_bridge_misc(bridge);
+}
+
+
+/* allocate and initialize PCI-to-PCI bridge data structure */
+static void add_p2p_bridge(acpi_handle *handle, int seg, int bus, int dev, int fn)
+{
+        struct acpiphp_bridge *bridge;
+        u8 tmp8;
+        u16 tmp16;
+        u64 base64, limit64;
+        u32 base, limit, base32u, limit32u;
+
+        bridge = kmalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
+        if (bridge == NULL) {
+                err("out of memory\n");
+                return;
+        }
+
+        memset(bridge, 0, sizeof(struct acpiphp_bridge));
+
+        bridge->type = BRIDGE_TYPE_P2P;
+        bridge->handle = handle;
+        bridge->seg = seg;
+
+        bridge->pci_dev = pci_find_slot(bus, PCI_DEVFN(dev, fn));
+        if (!bridge->pci_dev) {
+                err("Can't get pci_dev\n");
+                kfree(bridge);
+                return;
+        }
+
+        bridge->pci_bus = bridge->pci_dev->subordinate;
+        if (!bridge->pci_bus) {
+                err("This is not a PCI-to-PCI bridge!\n");
+                kfree(bridge);
+                return;
+        }
+
+        spin_lock_init(&bridge->res_lock);
+
+        bridge->bus = bridge->pci_bus->number;
+        bridge->sub = bridge->pci_bus->subordinate;
+
+        /*
+         * decode resources under this P2P bridge
+         */
+
+        /* I/O resources */
+        pci_read_config_byte(bridge->pci_dev, PCI_IO_BASE, &tmp8);
+        base = tmp8;
+        pci_read_config_byte(bridge->pci_dev, PCI_IO_LIMIT, &tmp8);
+        limit = tmp8;
+
+        switch (base & PCI_IO_RANGE_TYPE_MASK) {
+        case PCI_IO_RANGE_TYPE_16:
+                base = (base << 8) & 0xf000;
+                limit = ((limit << 8) & 0xf000) + 0xfff;
+                bridge->io_head = acpiphp_make_resource((u64)base, limit - base + 1);
+                if (!bridge->io_head) {
+                        err("out of memory\n");
+                        kfree(bridge);
+                        return;
+                }
+                dbg("16bit I/O range: %04x-%04x\n",
+                    (u32)bridge->io_head->base,
+                    (u32)(bridge->io_head->base + bridge->io_head->length - 1));
+                break;
+        case PCI_IO_RANGE_TYPE_32:
+                pci_read_config_word(bridge->pci_dev, PCI_IO_BASE_UPPER16, &tmp16);
+                base = ((u32)tmp16 << 16) | ((base << 8) & 0xf000);
+                pci_read_config_word(bridge->pci_dev, PCI_IO_LIMIT_UPPER16, &tmp16);
+                limit = (((u32)tmp16 << 16) | ((limit << 8) & 0xf000)) + 0xfff;
+                bridge->io_head = acpiphp_make_resource((u64)base, limit - base + 1);
+                if (!bridge->io_head) {
+                        err("out of memory\n");
+                        kfree(bridge);
+                        return;
+                }
+                dbg("32bit I/O range: %08x-%08x\n",
+                    (u32)bridge->io_head->base,
+                    (u32)(bridge->io_head->base + bridge->io_head->length - 1));
+                break;
+        case 0x0f:
+                dbg("I/O space unsupported\n");
+                break;
+        default:
+                warn("Unknown I/O range type\n");
+        }
+
+        /* Memory resources (mandatory for P2P bridge) */
+        pci_read_config_word(bridge->pci_dev, PCI_MEMORY_BASE, &tmp16);
+        base = (tmp16 & 0xfff0) << 16;
+        pci_read_config_word(bridge->pci_dev, PCI_MEMORY_LIMIT, &tmp16);
+        limit = ((tmp16 & 0xfff0) << 16) | 0xfffff;
+        bridge->mem_head = acpiphp_make_resource((u64)base, limit - base + 1);
+        if (!bridge->mem_head) {
+                err("out of memory\n");
+                kfree(bridge);
+                return;
+        }
+        dbg("32bit Memory range: %08x-%08x\n",
+            (u32)bridge->mem_head->base,
+            (u32)(bridge->mem_head->base + bridge->mem_head->length-1));
+
+        /* Prefetchable Memory resources (optional) */
+        pci_read_config_word(bridge->pci_dev, PCI_PREF_MEMORY_BASE, &tmp16);
+        base = tmp16;
+        pci_read_config_word(bridge->pci_dev, PCI_PREF_MEMORY_LIMIT, &tmp16);
+        limit = tmp16;
+
+        switch (base & PCI_MEMORY_RANGE_TYPE_MASK) {
+        case PCI_PREF_RANGE_TYPE_32:
+                base = (base & 0xfff0) << 16;
+                limit = ((limit & 0xfff0) << 16) | 0xfffff;
+                bridge->p_mem_head = acpiphp_make_resource((u64)base, limit - base + 1);
+                if (!bridge->p_mem_head) {
+                        err("out of memory\n");
+                        kfree(bridge);
+                        return;
+                }
+                dbg("32bit Prefetchable memory range: %08x-%08x\n",
+                    (u32)bridge->p_mem_head->base,
+                    (u32)(bridge->p_mem_head->base + bridge->p_mem_head->length - 1));
+                break;
+        case PCI_PREF_RANGE_TYPE_64:
+                pci_read_config_dword(bridge->pci_dev, PCI_PREF_BASE_UPPER32, &base32u);
+                pci_read_config_dword(bridge->pci_dev, PCI_PREF_LIMIT_UPPER32, &limit32u);
+                base64 = ((u64)base32u << 32) | ((base & 0xfff0) << 16);
+                limit64 = (((u64)limit32u << 32) | ((limit & 0xfff0) << 16)) + 0xfffff;
+
+                bridge->p_mem_head = acpiphp_make_resource(base64, limit64 - base64 + 1);
+                if (!bridge->p_mem_head) {
+                        err("out of memory\n");
+                        kfree(bridge);
+                        return;
+                }
+                dbg("64bit Prefetchable memory range: %08x%08x-%08x%08x\n",
+                    (u32)(bridge->p_mem_head->base >> 32),
+                    (u32)(bridge->p_mem_head->base & 0xffffffff),
+                    (u32)((bridge->p_mem_head->base + bridge->p_mem_head->length - 1) >> 32),
+                    (u32)((bridge->p_mem_head->base + bridge->p_mem_head->length - 1) & 0xffffffff));
+                break;
+        case 0x0f:
+                break;
+        default:
+                warn("Unknown prefetchale memory type\n");
+        }
+
+        init_bridge_misc(bridge);
+}
+
+
+/* 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 *segbus = context;
+        unsigned long tmp;
+        int seg, bus, device, function;
+        struct pci_dev *dev;
+
+        /* get PCI address */
+        seg = (*segbus >> 8) & 0xff;
+        bus = *segbus & 0xff;
+
+        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", __FUNCTION__);
+                return AE_OK;
+        }
+
+        device = (tmp >> 16) & 0xffff;
+        function = tmp & 0xffff;
+
+        dev = pci_find_slot(bus, PCI_DEVFN(device, function));
+
+        if (!dev)
+                return AE_OK;
+
+        if (!dev->subordinate)
+                return AE_OK;
+
+        /* 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, seg, bus, device, function);
+        }
+
+        return AE_OK;
+}
+
+
+/* find hot-pluggable slots, and then find P2P bridge */
+static int add_bridge(acpi_handle handle)
+{
+        acpi_status status;
+        unsigned long tmp;
+        int seg, bus;
+        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", __FUNCTION__);
+                        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;
+        }
+
+        /* 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, seg, bus);
+                return 0;
+        }
+
+        tmp = seg << 8 | bus;
+
+        /* search P2P bridges under this host bridge */
+        status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
+                                     find_p2p_bridge, &tmp, NULL);
+
+        if (ACPI_FAILURE(status))
+                warn("find_p2p_bridge faied (error code = 0x%x)\n",status);
+
+        return 0;
+}
+
+
+static void remove_bridge(acpi_handle handle)
+{
+        /* No-op for now .. */
+}
+
+
+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", __FUNCTION__);
+                        status = acpi_evaluate_object(func->handle, "_PS0", NULL, NULL);
+                        if (ACPI_FAILURE(status)) {
+                                warn("%s: _PS0 failed\n", __FUNCTION__);
+                                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;
+        struct acpi_object_list arg_list;
+        union acpi_object arg;
+
+        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->pci_dev && (func->flags & FUNC_HAS_PS3)) {
+                        status = acpi_evaluate_object(func->handle, "_PS3", NULL, NULL);
+                        if (ACPI_FAILURE(status)) {
+                                warn("%s: _PS3 failed\n", __FUNCTION__);
+                                retval = -1;
+                                goto err_exit;
+                        } else
+                                break;
+                }
+        }
+
+        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->pci_dev && (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", __FUNCTION__);
+                                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;
+}
+
+
+/**
+ * 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 enable_device(struct acpiphp_slot *slot)
+{
+        u8 bus;
+        struct pci_dev *dev;
+        struct pci_bus *child;
+        struct list_head *l;
+        struct acpiphp_func *func;
+        int retval = 0;
+        int num;
+
+        if (slot->flags & SLOT_ENABLED)
+                goto err_exit;
+
+        /* sanity check: dev should be NULL when hot-plugged in */
+        dev = pci_find_slot(slot->bridge->bus, PCI_DEVFN(slot->device, 0));
+        if (dev) {
+                /* This case shouldn't happen */
+                err("pci_dev structure already exists.\n");
+                retval = -1;
+                goto err_exit;
+        }
+
+        /* allocate resources to device */
+        retval = acpiphp_configure_slot(slot);
+        if (retval)
+                goto err_exit;
+
+        /* returned `dev' is the *first function* only! */
+        num = pci_scan_slot(slot->bridge->pci_bus, PCI_DEVFN(slot->device, 0));
+        if (num)
+                pci_bus_add_devices(slot->bridge->pci_bus);
+        dev = pci_find_slot(slot->bridge->bus, PCI_DEVFN(slot->device, 0));
+
+        if (!dev) {
+                err("No new device found\n");
+                retval = -1;
+                goto err_exit;
+        }
+
+        if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
+                pci_read_config_byte(dev, PCI_SECONDARY_BUS, &bus);
+                child = (struct pci_bus*) pci_add_new_bus(dev->bus, dev, bus);
+                pci_do_scan_bus(child);
+        }
+
+        /* associate pci_dev to our representation */
+        list_for_each (l, &slot->funcs) {
+                func = list_entry(l, struct acpiphp_func, sibling);
+
+                func->pci_dev = pci_find_slot(slot->bridge->bus,
+                                              PCI_DEVFN(slot->device,
+                                                        func->function));
+                if (!func->pci_dev)
+                        continue;
+
+                /* configure device */
+                retval = acpiphp_configure_function(func);
+                if (retval)
+                        goto err_exit;
+        }
+
+        slot->flags |= SLOT_ENABLED;
+
+        dbg("Available resources:\n");
+        acpiphp_dump_resource(slot->bridge);
+
+ err_exit:
+        return retval;
+}
+
+
+/**
+ * disable_device - disable a 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->pci_dev)
+                        acpiphp_unconfigure_function(func);
+        }
+
+        slot->flags &= (~SLOT_ENABLED);
+
+ err_exit:
+        return retval;
+}
+
+
+/**
+ * get_slot_status - get ACPI slot status
+ *
+ * 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 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_check_bridge - re-enumerate devices
+ *
+ * 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;
+                        }
+                        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", __FUNCTION__, enabled, disabled);
+
+ err_exit:
+        return retval;
+}
+
+/*
+ * ACPI event handlers
+ */
+
+/**
+ * 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 };
+
+        bridge = (struct acpiphp_bridge *)context;
+
+        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", __FUNCTION__, objname);
+                acpiphp_check_bridge(bridge);
+                break;
+
+        case ACPI_NOTIFY_DEVICE_CHECK:
+                /* device check */
+                dbg("%s: Device check notify on %s\n", __FUNCTION__, objname);
+                acpiphp_check_bridge(bridge);
+                break;
+
+        case ACPI_NOTIFY_DEVICE_WAKE:
+                /* wake event */
+                dbg("%s: Device wake notify on %s\n", __FUNCTION__, objname);
+                break;
+
+        case ACPI_NOTIFY_EJECT_REQUEST:
+                /* request device eject */
+                dbg("%s: Device eject notify on %s\n", __FUNCTION__, objname);
+                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", __FUNCTION__, 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", __FUNCTION__, objname);
+                acpiphp_check_bridge(func->slot->bridge);
+                break;
+
+        case ACPI_NOTIFY_DEVICE_WAKE:
+                /* wake event */
+                dbg("%s: Device wake notify on %s\n", __FUNCTION__, objname);
+                break;
+
+        case ACPI_NOTIFY_EJECT_REQUEST:
+                /* request device eject */
+                dbg("%s: Device eject notify on %s\n", __FUNCTION__, objname);
+                acpiphp_disable_slot(func->slot);
+                break;
+
+        default:
+                warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
+                break;
+        }
+}
+
+
+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;
+
+        if (list_empty(&pci_root_buses))
+                return -1;
+
+        num = acpi_pci_register_driver(&acpi_pci_hp_driver);
+
+        if (num <= 0)
+                return -1;
+
+        return 0;
+}
+
+
+/**
+ * acpiphp_glue_exit - terminates all PCI hotplug - ACPI glue data structures
+ *
+ * This function frees all data allocated in acpiphp_glue_init()
+ */
+void __exit acpiphp_glue_exit(void)
+{
+        struct list_head *l1, *l2, *n1, *n2;
+        struct acpiphp_bridge *bridge;
+        struct acpiphp_slot *slot, *next;
+        struct acpiphp_func *func;
+        acpi_status status;
+
+        list_for_each_safe (l1, n1, &bridge_list) {
+                bridge = (struct acpiphp_bridge *)l1;
+                slot = bridge->slots;
+                while (slot) {
+                        next = slot->next;
+                        list_for_each_safe (l2, n2, &slot->funcs) {
+                                func = list_entry(l2, struct acpiphp_func, sibling);
+                                acpiphp_free_resource(&func->io_head);
+                                acpiphp_free_resource(&func->mem_head);
+                                acpiphp_free_resource(&func->p_mem_head);
+                                acpiphp_free_resource(&func->bus_head);
+                                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");
+                                kfree(func);
+                        }
+                        kfree(slot);
+                        slot = next;
+                }
+                status = acpi_remove_notify_handler(bridge->handle, ACPI_SYSTEM_NOTIFY,
+                                                    handle_hotplug_event_bridge);
+                if (ACPI_FAILURE(status))
+                        err("failed to remove notify handler\n");
+
+                acpiphp_free_resource(&bridge->io_head);
+                acpiphp_free_resource(&bridge->mem_head);
+                acpiphp_free_resource(&bridge->p_mem_head);
+                acpiphp_free_resource(&bridge->bus_head);
+
+                kfree(bridge);
+        }
+
+        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 list_head *node;
+        struct acpiphp_bridge *bridge;
+        int num_slots;
+
+        num_slots = 0;
+
+        list_for_each (node, &bridge_list) {
+                bridge = (struct acpiphp_bridge *)node;
+                dbg("Bus%d %dslot(s)\n", bridge->bus, bridge->nr_slots);
+                num_slots += bridge->nr_slots;
+        }
+
+        dbg("Total %dslots\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
+
+/* search matching slot from id  */
+struct acpiphp_slot *get_slot_from_id(int id)
+{
+        struct list_head *node;
+        struct acpiphp_bridge *bridge;
+        struct acpiphp_slot *slot;
+
+        list_for_each (node, &bridge_list) {
+                bridge = (struct acpiphp_bridge *)node;
+                for (slot = bridge->slots; slot; slot = slot->next)
+                        if (slot->id == id)
+                                return slot;
+        }
+
+        /* should never happen! */
+        err("%s: no object for id %d\n", __FUNCTION__, id);
+        WARN_ON(1);
+        return NULL;
+}
+
+
+/**
+ * acpiphp_enable_slot - power on slot
+ */
+int acpiphp_enable_slot(struct acpiphp_slot *slot)
+{
+        int retval;
+
+        down(&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);
+
+ err_exit:
+        up(&slot->crit_sect);
+        return retval;
+}
+
+
+/**
+ * acpiphp_disable_slot - power off slot
+ */
+int acpiphp_disable_slot(struct acpiphp_slot *slot)
+{
+        int retval = 0;
+
+        down(&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;
+
+        acpiphp_resource_sort_and_combine(&slot->bridge->io_head);
+        acpiphp_resource_sort_and_combine(&slot->bridge->mem_head);
+        acpiphp_resource_sort_and_combine(&slot->bridge->p_mem_head);
+        acpiphp_resource_sort_and_combine(&slot->bridge->bus_head);
+        dbg("Available resources:\n");
+        acpiphp_dump_resource(slot->bridge);
+
+ err_exit:
+        up(&slot->crit_sect);
+        return retval;
+}
+
+
+/*
+ * slot enabled:  1
+ * slot disabled: 0
+ */
+u8 acpiphp_get_power_status(struct acpiphp_slot *slot)
+{
+        unsigned int sta;
+
+        sta = get_slot_status(slot);
+
+        return (sta & ACPI_STA_ENABLED) ? 1 : 0;
+}
+
+
+/*
+ * latch closed:  1
+ * latch   open:  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) ? 1 : 0;
+}
+
+
+/*
+ * 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;
+}
+
+
+/*
+ * pci address (seg/bus/dev)
+ */
+u32 acpiphp_get_address(struct acpiphp_slot *slot)
+{
+        u32 address;
+
+        address = ((slot->bridge->seg) << 16) |
+                  ((slot->bridge->bus) << 8) |
+                  slot->device;
+
+        return address;
+}