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path: root/drivers/acpi/pci_root.c
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Diffstat (limited to 'drivers/acpi/pci_root.c')
-rw-r--r--drivers/acpi/pci_root.c124
1 files changed, 124 insertions, 0 deletions
diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index 471b2dcb1c67..1389811aa21b 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -673,3 +673,127 @@ int __init acpi_pci_root_init(void)
return 0;
}
+/* 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)
+{
+ 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;
+
+ acpi_bus_hot_remove_device(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;
+
+ 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)
+ 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;
+ }
+
+ 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)
+{
+ 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);
+
+ acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
+ handle_hotplug_event_root, NULL);
+ printk(KERN_DEBUG "acpi root: %s notify handler 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);
+}