PCI/ACPI: Print info if host bridge notify handler installation fails

[platform/adaptation/renesas_rcar/renesas_kernel.git] / drivers / acpi / pci_root.c

diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index 0e593a2..fd59f57 100644 (file)
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -186,21 +186,6 @@ static acpi_status try_get_root_bridge_busnr(acpi_handle handle,
        return AE_OK;
 }
 
-static void acpi_pci_bridge_scan(struct acpi_device *device)
-{
-       int status;
-       struct acpi_device *child = NULL;
-
-       if (device->flags.bus_address)
-               if (device->parent && device->parent->ops.bind) {
-                       status = device->parent->ops.bind(device);
-                       if (!status) {
-                               list_for_each_entry(child, &device->children, node)
-                                       acpi_pci_bridge_scan(child);
-                       }
-               }
-}
-
 static u8 pci_osc_uuid_str[] = "33DB4D5B-1FF7-401C-9657-7441C03DD766";
 
 static acpi_status acpi_pci_run_osc(acpi_handle handle,
@@ -450,7 +435,6 @@ static int acpi_pci_root_add(struct acpi_device *device)
        int result;
        struct acpi_pci_root *root;
        acpi_handle handle;
-       struct acpi_device *child;
        struct acpi_pci_driver *driver;
        u32 flags, base_flags;
        bool is_osc_granted = false;
@@ -602,21 +586,6 @@ static int acpi_pci_root_add(struct acpi_device *device)
                goto out_del_root;
        }
 
-       /*
-        * Attach ACPI-PCI Context
-        * -----------------------
-        * Thus binding the ACPI and PCI devices.
-        */
-       result = acpi_pci_bind_root(device);
-       if (result)
-               goto out_del_root;
-
-       /*
-        * Scan and bind all _ADR-Based Devices
-        */
-       list_for_each_entry(child, &device->children, node)
-               acpi_pci_bridge_scan(child);
-
        /* ASPM setting */
        if (is_osc_granted) {
                if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM)
@@ -631,8 +600,10 @@ static int acpi_pci_root_add(struct acpi_device *device)
        if (device->wakeup.flags.run_wake)
                device_set_run_wake(root->bus->bridge, true);
 
-       if (system_state != SYSTEM_BOOTING)
+       if (system_state != SYSTEM_BOOTING) {
+               pcibios_resource_survey_bus(root->bus);
                pci_assign_unassigned_bus_resources(root->bus);
+       }
 
        mutex_lock(&acpi_pci_root_lock);
        list_for_each_entry(driver, &acpi_pci_drivers, node)
@@ -702,3 +673,133 @@ 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)
+{
+       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);
+}