| /* |
| * pci_root.c - ACPI PCI Root Bridge Driver ($Revision: 40 $) |
| * |
| * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> |
| * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> |
| * |
| * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| * |
| * 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. 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., |
| * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. |
| * |
| * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/init.h> |
| #include <linux/types.h> |
| #include <linux/mutex.h> |
| #include <linux/pm.h> |
| #include <linux/pm_runtime.h> |
| #include <linux/pci.h> |
| #include <linux/pci-acpi.h> |
| #include <linux/pci-aspm.h> |
| #include <linux/acpi.h> |
| #include <linux/slab.h> |
| #include <acpi/acpi_bus.h> |
| #include <acpi/acpi_drivers.h> |
| #include <acpi/apei.h> |
| |
| #define PREFIX "ACPI: " |
| |
| #define _COMPONENT ACPI_PCI_COMPONENT |
| ACPI_MODULE_NAME("pci_root"); |
| #define ACPI_PCI_ROOT_CLASS "pci_bridge" |
| #define ACPI_PCI_ROOT_DEVICE_NAME "PCI Root Bridge" |
| static int acpi_pci_root_add(struct acpi_device *device, |
| const struct acpi_device_id *not_used); |
| static void acpi_pci_root_remove(struct acpi_device *device); |
| |
| #define ACPI_PCIE_REQ_SUPPORT (OSC_EXT_PCI_CONFIG_SUPPORT \ |
| | OSC_ACTIVE_STATE_PWR_SUPPORT \ |
| | OSC_CLOCK_PWR_CAPABILITY_SUPPORT \ |
| | OSC_MSI_SUPPORT) |
| |
| static const struct acpi_device_id root_device_ids[] = { |
| {"PNP0A03", 0}, |
| {"", 0}, |
| }; |
| |
| static struct acpi_scan_handler pci_root_handler = { |
| .ids = root_device_ids, |
| .attach = acpi_pci_root_add, |
| .detach = acpi_pci_root_remove, |
| .hotplug = { |
| .ignore = true, |
| }, |
| }; |
| |
| /* Lock to protect both acpi_pci_roots lists */ |
| static DEFINE_MUTEX(acpi_pci_root_lock); |
| static LIST_HEAD(acpi_pci_roots); |
| |
| static DEFINE_MUTEX(osc_lock); |
| |
| /** |
| * acpi_is_root_bridge - determine whether an ACPI CA node is a PCI root bridge |
| * @handle - the ACPI CA node in question. |
| * |
| * Note: we could make this API take a struct acpi_device * instead, but |
| * for now, it's more convenient to operate on an acpi_handle. |
| */ |
| int acpi_is_root_bridge(acpi_handle handle) |
| { |
| int ret; |
| struct acpi_device *device; |
| |
| ret = acpi_bus_get_device(handle, &device); |
| if (ret) |
| return 0; |
| |
| ret = acpi_match_device_ids(device, root_device_ids); |
| if (ret) |
| return 0; |
| else |
| return 1; |
| } |
| EXPORT_SYMBOL_GPL(acpi_is_root_bridge); |
| |
| static acpi_status |
| get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data) |
| { |
| struct resource *res = data; |
| struct acpi_resource_address64 address; |
| |
| if (resource->type != ACPI_RESOURCE_TYPE_ADDRESS16 && |
| resource->type != ACPI_RESOURCE_TYPE_ADDRESS32 && |
| resource->type != ACPI_RESOURCE_TYPE_ADDRESS64) |
| return AE_OK; |
| |
| acpi_resource_to_address64(resource, &address); |
| if ((address.address_length > 0) && |
| (address.resource_type == ACPI_BUS_NUMBER_RANGE)) { |
| res->start = address.minimum; |
| res->end = address.minimum + address.address_length - 1; |
| } |
| |
| return AE_OK; |
| } |
| |
| static acpi_status try_get_root_bridge_busnr(acpi_handle handle, |
| struct resource *res) |
| { |
| acpi_status status; |
| |
| res->start = -1; |
| status = |
| acpi_walk_resources(handle, METHOD_NAME__CRS, |
| get_root_bridge_busnr_callback, res); |
| if (ACPI_FAILURE(status)) |
| return status; |
| if (res->start == -1) |
| return AE_ERROR; |
| return AE_OK; |
| } |
| |
| static u8 pci_osc_uuid_str[] = "33DB4D5B-1FF7-401C-9657-7441C03DD766"; |
| |
| static acpi_status acpi_pci_run_osc(acpi_handle handle, |
| const u32 *capbuf, u32 *retval) |
| { |
| struct acpi_osc_context context = { |
| .uuid_str = pci_osc_uuid_str, |
| .rev = 1, |
| .cap.length = 12, |
| .cap.pointer = (void *)capbuf, |
| }; |
| acpi_status status; |
| |
| status = acpi_run_osc(handle, &context); |
| if (ACPI_SUCCESS(status)) { |
| *retval = *((u32 *)(context.ret.pointer + 8)); |
| kfree(context.ret.pointer); |
| } |
| return status; |
| } |
| |
| static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root, |
| u32 support, |
| u32 *control) |
| { |
| acpi_status status; |
| u32 result, capbuf[3]; |
| |
| support &= OSC_PCI_SUPPORT_MASKS; |
| support |= root->osc_support_set; |
| |
| capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE; |
| capbuf[OSC_SUPPORT_TYPE] = support; |
| if (control) { |
| *control &= OSC_PCI_CONTROL_MASKS; |
| capbuf[OSC_CONTROL_TYPE] = *control | root->osc_control_set; |
| } else { |
| /* Run _OSC query only with existing controls. */ |
| capbuf[OSC_CONTROL_TYPE] = root->osc_control_set; |
| } |
| |
| status = acpi_pci_run_osc(root->device->handle, capbuf, &result); |
| if (ACPI_SUCCESS(status)) { |
| root->osc_support_set = support; |
| if (control) |
| *control = result; |
| } |
| return status; |
| } |
| |
| static acpi_status acpi_pci_osc_support(struct acpi_pci_root *root, u32 flags) |
| { |
| acpi_status status; |
| acpi_handle tmp; |
| |
| status = acpi_get_handle(root->device->handle, "_OSC", &tmp); |
| if (ACPI_FAILURE(status)) |
| return status; |
| mutex_lock(&osc_lock); |
| status = acpi_pci_query_osc(root, flags, NULL); |
| mutex_unlock(&osc_lock); |
| return status; |
| } |
| |
| struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle) |
| { |
| struct acpi_pci_root *root; |
| struct acpi_device *device; |
| |
| if (acpi_bus_get_device(handle, &device) || |
| acpi_match_device_ids(device, root_device_ids)) |
| return NULL; |
| |
| root = acpi_driver_data(device); |
| |
| return root; |
| } |
| EXPORT_SYMBOL_GPL(acpi_pci_find_root); |
| |
| struct acpi_handle_node { |
| struct list_head node; |
| acpi_handle handle; |
| }; |
| |
| /** |
| * acpi_get_pci_dev - convert ACPI CA handle to struct pci_dev |
| * @handle: the handle in question |
| * |
| * Given an ACPI CA handle, the desired PCI device is located in the |
| * list of PCI devices. |
| * |
| * If the device is found, its reference count is increased and this |
| * function returns a pointer to its data structure. The caller must |
| * decrement the reference count by calling pci_dev_put(). |
| * If no device is found, %NULL is returned. |
| */ |
| struct pci_dev *acpi_get_pci_dev(acpi_handle handle) |
| { |
| int dev, fn; |
| unsigned long long adr; |
| acpi_status status; |
| acpi_handle phandle; |
| struct pci_bus *pbus; |
| struct pci_dev *pdev = NULL; |
| struct acpi_handle_node *node, *tmp; |
| struct acpi_pci_root *root; |
| LIST_HEAD(device_list); |
| |
| /* |
| * Walk up the ACPI CA namespace until we reach a PCI root bridge. |
| */ |
| phandle = handle; |
| while (!acpi_is_root_bridge(phandle)) { |
| node = kzalloc(sizeof(struct acpi_handle_node), GFP_KERNEL); |
| if (!node) |
| goto out; |
| |
| INIT_LIST_HEAD(&node->node); |
| node->handle = phandle; |
| list_add(&node->node, &device_list); |
| |
| status = acpi_get_parent(phandle, &phandle); |
| if (ACPI_FAILURE(status)) |
| goto out; |
| } |
| |
| root = acpi_pci_find_root(phandle); |
| if (!root) |
| goto out; |
| |
| pbus = root->bus; |
| |
| /* |
| * Now, walk back down the PCI device tree until we return to our |
| * original handle. Assumes that everything between the PCI root |
| * bridge and the device we're looking for must be a P2P bridge. |
| */ |
| list_for_each_entry(node, &device_list, node) { |
| acpi_handle hnd = node->handle; |
| status = acpi_evaluate_integer(hnd, "_ADR", NULL, &adr); |
| if (ACPI_FAILURE(status)) |
| goto out; |
| dev = (adr >> 16) & 0xffff; |
| fn = adr & 0xffff; |
| |
| pdev = pci_get_slot(pbus, PCI_DEVFN(dev, fn)); |
| if (!pdev || hnd == handle) |
| break; |
| |
| pbus = pdev->subordinate; |
| pci_dev_put(pdev); |
| |
| /* |
| * This function may be called for a non-PCI device that has a |
| * PCI parent (eg. a disk under a PCI SATA controller). In that |
| * case pdev->subordinate will be NULL for the parent. |
| */ |
| if (!pbus) { |
| dev_dbg(&pdev->dev, "Not a PCI-to-PCI bridge\n"); |
| pdev = NULL; |
| break; |
| } |
| } |
| out: |
| list_for_each_entry_safe(node, tmp, &device_list, node) |
| kfree(node); |
| |
| return pdev; |
| } |
| EXPORT_SYMBOL_GPL(acpi_get_pci_dev); |
| |
| /** |
| * acpi_pci_osc_control_set - Request control of PCI root _OSC features. |
| * @handle: ACPI handle of a PCI root bridge (or PCIe Root Complex). |
| * @mask: Mask of _OSC bits to request control of, place to store control mask. |
| * @req: Mask of _OSC bits the control of is essential to the caller. |
| * |
| * Run _OSC query for @mask and if that is successful, compare the returned |
| * mask of control bits with @req. If all of the @req bits are set in the |
| * returned mask, run _OSC request for it. |
| * |
| * The variable at the @mask address may be modified regardless of whether or |
| * not the function returns success. On success it will contain the mask of |
| * _OSC bits the BIOS has granted control of, but its contents are meaningless |
| * on failure. |
| **/ |
| acpi_status acpi_pci_osc_control_set(acpi_handle handle, u32 *mask, u32 req) |
| { |
| struct acpi_pci_root *root; |
| acpi_status status; |
| u32 ctrl, capbuf[3]; |
| acpi_handle tmp; |
| |
| if (!mask) |
| return AE_BAD_PARAMETER; |
| |
| ctrl = *mask & OSC_PCI_CONTROL_MASKS; |
| if ((ctrl & req) != req) |
| return AE_TYPE; |
| |
| root = acpi_pci_find_root(handle); |
| if (!root) |
| return AE_NOT_EXIST; |
| |
| status = acpi_get_handle(handle, "_OSC", &tmp); |
| if (ACPI_FAILURE(status)) |
| return status; |
| |
| mutex_lock(&osc_lock); |
| |
| *mask = ctrl | root->osc_control_set; |
| /* No need to evaluate _OSC if the control was already granted. */ |
| if ((root->osc_control_set & ctrl) == ctrl) |
| goto out; |
| |
| /* Need to check the available controls bits before requesting them. */ |
| while (*mask) { |
| status = acpi_pci_query_osc(root, root->osc_support_set, mask); |
| if (ACPI_FAILURE(status)) |
| goto out; |
| if (ctrl == *mask) |
| break; |
| ctrl = *mask; |
| } |
| |
| if ((ctrl & req) != req) { |
| status = AE_SUPPORT; |
| goto out; |
| } |
| |
| capbuf[OSC_QUERY_TYPE] = 0; |
| capbuf[OSC_SUPPORT_TYPE] = root->osc_support_set; |
| capbuf[OSC_CONTROL_TYPE] = ctrl; |
| status = acpi_pci_run_osc(handle, capbuf, mask); |
| if (ACPI_SUCCESS(status)) |
| root->osc_control_set = *mask; |
| out: |
| mutex_unlock(&osc_lock); |
| return status; |
| } |
| EXPORT_SYMBOL(acpi_pci_osc_control_set); |
| |
| static int acpi_pci_root_add(struct acpi_device *device, |
| const struct acpi_device_id *not_used) |
| { |
| unsigned long long segment, bus; |
| acpi_status status; |
| int result; |
| struct acpi_pci_root *root; |
| u32 flags, base_flags; |
| |
| root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL); |
| if (!root) |
| return -ENOMEM; |
| |
| segment = 0; |
| status = acpi_evaluate_integer(device->handle, METHOD_NAME__SEG, NULL, |
| &segment); |
| if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { |
| printk(KERN_ERR PREFIX "can't evaluate _SEG\n"); |
| result = -ENODEV; |
| goto end; |
| } |
| |
| /* Check _CRS first, then _BBN. If no _BBN, default to zero. */ |
| root->secondary.flags = IORESOURCE_BUS; |
| status = try_get_root_bridge_busnr(device->handle, &root->secondary); |
| if (ACPI_FAILURE(status)) { |
| /* |
| * We need both the start and end of the downstream bus range |
| * to interpret _CBA (MMCONFIG base address), so it really is |
| * supposed to be in _CRS. If we don't find it there, all we |
| * can do is assume [_BBN-0xFF] or [0-0xFF]. |
| */ |
| root->secondary.end = 0xFF; |
| printk(KERN_WARNING FW_BUG PREFIX |
| "no secondary bus range in _CRS\n"); |
| status = acpi_evaluate_integer(device->handle, METHOD_NAME__BBN, |
| NULL, &bus); |
| if (ACPI_SUCCESS(status)) |
| root->secondary.start = bus; |
| else if (status == AE_NOT_FOUND) |
| root->secondary.start = 0; |
| else { |
| printk(KERN_ERR PREFIX "can't evaluate _BBN\n"); |
| result = -ENODEV; |
| goto end; |
| } |
| } |
| |
| INIT_LIST_HEAD(&root->node); |
| root->device = device; |
| root->segment = segment & 0xFFFF; |
| strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME); |
| strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS); |
| device->driver_data = root; |
| |
| printk(KERN_INFO PREFIX "%s [%s] (domain %04x %pR)\n", |
| acpi_device_name(device), acpi_device_bid(device), |
| root->segment, &root->secondary); |
| |
| root->mcfg_addr = acpi_pci_root_get_mcfg_addr(device->handle); |
| |
| /* |
| * All supported architectures that use ACPI have support for |
| * PCI domains, so we indicate this in _OSC support capabilities. |
| */ |
| flags = base_flags = OSC_PCI_SEGMENT_GROUPS_SUPPORT; |
| acpi_pci_osc_support(root, flags); |
| |
| /* |
| * TBD: Need PCI interface for enumeration/configuration of roots. |
| */ |
| |
| mutex_lock(&acpi_pci_root_lock); |
| list_add_tail(&root->node, &acpi_pci_roots); |
| mutex_unlock(&acpi_pci_root_lock); |
| |
| /* |
| * Scan the Root Bridge |
| * -------------------- |
| * Must do this prior to any attempt to bind the root device, as the |
| * PCI namespace does not get created until this call is made (and |
| * thus the root bridge's pci_dev does not exist). |
| */ |
| root->bus = pci_acpi_scan_root(root); |
| if (!root->bus) { |
| printk(KERN_ERR PREFIX |
| "Bus %04x:%02x not present in PCI namespace\n", |
| root->segment, (unsigned int)root->secondary.start); |
| result = -ENODEV; |
| goto out_del_root; |
| } |
| |
| /* Indicate support for various _OSC capabilities. */ |
| if (pci_ext_cfg_avail()) |
| flags |= OSC_EXT_PCI_CONFIG_SUPPORT; |
| if (pcie_aspm_support_enabled()) { |
| flags |= OSC_ACTIVE_STATE_PWR_SUPPORT | |
| OSC_CLOCK_PWR_CAPABILITY_SUPPORT; |
| } |
| if (pci_msi_enabled()) |
| flags |= OSC_MSI_SUPPORT; |
| if (flags != base_flags) { |
| status = acpi_pci_osc_support(root, flags); |
| if (ACPI_FAILURE(status)) { |
| dev_info(&device->dev, "ACPI _OSC support " |
| "notification failed, disabling PCIe ASPM\n"); |
| pcie_no_aspm(); |
| flags = base_flags; |
| } |
| } |
| |
| if (!pcie_ports_disabled |
| && (flags & ACPI_PCIE_REQ_SUPPORT) == ACPI_PCIE_REQ_SUPPORT) { |
| flags = OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL |
| | OSC_PCI_EXPRESS_NATIVE_HP_CONTROL |
| | OSC_PCI_EXPRESS_PME_CONTROL; |
| |
| if (pci_aer_available()) { |
| if (aer_acpi_firmware_first()) |
| dev_dbg(&device->dev, |
| "PCIe errors handled by BIOS.\n"); |
| else |
| flags |= OSC_PCI_EXPRESS_AER_CONTROL; |
| } |
| |
| dev_info(&device->dev, |
| "Requesting ACPI _OSC control (0x%02x)\n", flags); |
| |
| status = acpi_pci_osc_control_set(device->handle, &flags, |
| OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL); |
| if (ACPI_SUCCESS(status)) { |
| dev_info(&device->dev, |
| "ACPI _OSC control (0x%02x) granted\n", flags); |
| if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) { |
| /* |
| * We have ASPM control, but the FADT indicates |
| * that it's unsupported. Clear it. |
| */ |
| pcie_clear_aspm(root->bus); |
| } |
| } else { |
| dev_info(&device->dev, |
| "ACPI _OSC request failed (%s), " |
| "returned control mask: 0x%02x\n", |
| acpi_format_exception(status), flags); |
| pr_info("ACPI _OSC control for PCIe not granted, " |
| "disabling ASPM\n"); |
| pcie_no_aspm(); |
| } |
| } else { |
| dev_info(&device->dev, |
| "Unable to request _OSC control " |
| "(_OSC support mask: 0x%02x)\n", flags); |
| } |
| |
| pci_acpi_add_bus_pm_notifier(device, root->bus); |
| if (device->wakeup.flags.run_wake) |
| device_set_run_wake(root->bus->bridge, true); |
| |
| if (system_state != SYSTEM_BOOTING) { |
| pcibios_resource_survey_bus(root->bus); |
| pci_assign_unassigned_bus_resources(root->bus); |
| } |
| |
| /* need to after hot-added ioapic is registered */ |
| if (system_state != SYSTEM_BOOTING) |
| pci_enable_bridges(root->bus); |
| |
| pci_bus_add_devices(root->bus); |
| return 1; |
| |
| out_del_root: |
| mutex_lock(&acpi_pci_root_lock); |
| list_del(&root->node); |
| mutex_unlock(&acpi_pci_root_lock); |
| |
| end: |
| kfree(root); |
| return result; |
| } |
| |
| static void acpi_pci_root_remove(struct acpi_device *device) |
| { |
| struct acpi_pci_root *root = acpi_driver_data(device); |
| |
| pci_stop_root_bus(root->bus); |
| |
| device_set_run_wake(root->bus->bridge, false); |
| pci_acpi_remove_bus_pm_notifier(device); |
| |
| pci_remove_root_bus(root->bus); |
| |
| mutex_lock(&acpi_pci_root_lock); |
| list_del(&root->node); |
| mutex_unlock(&acpi_pci_root_lock); |
| kfree(root); |
| } |
| |
| void __init acpi_pci_root_init(void) |
| { |
| acpi_hest_init(); |
| |
| if (!acpi_pci_disabled) { |
| pci_acpi_crs_quirks(); |
| acpi_scan_add_handler(&pci_root_handler); |
| } |
| } |
| /* Support root bridge hotplug */ |
| |
| static void handle_root_bridge_insertion(acpi_handle handle) |
| { |
| struct acpi_device *device; |
| |
| if (!acpi_bus_get_device(handle, &device)) { |
| printk(KERN_DEBUG "acpi device exists...\n"); |
| return; |
| } |
| |
| if (acpi_bus_scan(handle)) |
| printk(KERN_ERR "cannot add bridge to acpi list\n"); |
| } |
| |
| static void handle_root_bridge_removal(struct acpi_device *device) |
| { |
| acpi_status status; |
| struct acpi_eject_event *ej_event; |
| |
| ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL); |
| if (!ej_event) { |
| /* Inform firmware the hot-remove operation has error */ |
| (void) acpi_evaluate_hotplug_ost(device->handle, |
| ACPI_NOTIFY_EJECT_REQUEST, |
| ACPI_OST_SC_NON_SPECIFIC_FAILURE, |
| NULL); |
| return; |
| } |
| |
| ej_event->device = device; |
| ej_event->event = ACPI_NOTIFY_EJECT_REQUEST; |
| |
| get_device(&device->dev); |
| status = acpi_os_hotplug_execute(acpi_bus_hot_remove_device, ej_event); |
| if (ACPI_FAILURE(status)) { |
| put_device(&device->dev); |
| kfree(ej_event); |
| } |
| } |
| |
| static void _handle_hotplug_event_root(struct work_struct *work) |
| { |
| struct acpi_pci_root *root; |
| struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER }; |
| struct acpi_hp_work *hp_work; |
| acpi_handle handle; |
| u32 type; |
| |
| hp_work = container_of(work, struct acpi_hp_work, work); |
| handle = hp_work->handle; |
| type = hp_work->type; |
| |
| acpi_scan_lock_acquire(); |
| |
| root = acpi_pci_find_root(handle); |
| acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); |
| |
| switch (type) { |
| case ACPI_NOTIFY_BUS_CHECK: |
| /* bus enumerate */ |
| printk(KERN_DEBUG "%s: Bus check notify on %s\n", __func__, |
| (char *)buffer.pointer); |
| if (root) |
| acpiphp_check_host_bridge(handle); |
| else |
| handle_root_bridge_insertion(handle); |
| |
| break; |
| |
| case ACPI_NOTIFY_DEVICE_CHECK: |
| /* device check */ |
| printk(KERN_DEBUG "%s: Device check notify on %s\n", __func__, |
| (char *)buffer.pointer); |
| if (!root) |
| handle_root_bridge_insertion(handle); |
| break; |
| |
| case ACPI_NOTIFY_EJECT_REQUEST: |
| /* request device eject */ |
| printk(KERN_DEBUG "%s: Device eject notify on %s\n", __func__, |
| (char *)buffer.pointer); |
| if (root) |
| handle_root_bridge_removal(root->device); |
| break; |
| default: |
| printk(KERN_WARNING "notify_handler: unknown event type 0x%x for %s\n", |
| type, (char *)buffer.pointer); |
| break; |
| } |
| |
| acpi_scan_lock_release(); |
| kfree(hp_work); /* allocated in handle_hotplug_event_bridge */ |
| kfree(buffer.pointer); |
| } |
| |
| static void handle_hotplug_event_root(acpi_handle handle, u32 type, |
| void *context) |
| { |
| alloc_acpi_hp_work(handle, type, context, |
| _handle_hotplug_event_root); |
| } |
| |
| static acpi_status __init |
| find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv) |
| { |
| acpi_status status; |
| char objname[64]; |
| struct acpi_buffer buffer = { .length = sizeof(objname), |
| .pointer = objname }; |
| int *count = (int *)context; |
| |
| if (!acpi_is_root_bridge(handle)) |
| return AE_OK; |
| |
| (*count)++; |
| |
| acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); |
| |
| status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, |
| handle_hotplug_event_root, NULL); |
| if (ACPI_FAILURE(status)) |
| printk(KERN_DEBUG "acpi root: %s notify handler is not installed, exit status: %u\n", |
| objname, (unsigned int)status); |
| else |
| printk(KERN_DEBUG "acpi root: %s notify handler is installed\n", |
| objname); |
| |
| return AE_OK; |
| } |
| |
| void __init acpi_pci_root_hp_init(void) |
| { |
| int num = 0; |
| |
| acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, |
| ACPI_UINT32_MAX, find_root_bridges, NULL, &num, NULL); |
| |
| printk(KERN_DEBUG "Found %d acpi root devices\n", num); |
| } |