@@ -21,6 +21,21 @@ struct vmgenid_state {
u8 this_id[VMGENID_SIZE];
};
+static void vmgenid_notify(acpi_handle handle, u32 event, void *data)
+{
+ struct acpi_device *device = data;
+ struct vmgenid_state *state;
+ u8 old_id[VMGENID_SIZE];
+
+ state = acpi_driver_data(device);
+
+ memcpy(old_id, state->this_id, sizeof(old_id));
+ memcpy(state->this_id, state->next_id, sizeof(state->this_id));
+ if (!memcmp(old_id, state->this_id, sizeof(old_id)))
+ return;
+ add_vmfork_randomness(state->this_id, sizeof(state->this_id));
+}
+
static int vmgenid_add(struct acpi_device *device)
{
struct acpi_buffer parsed = { ACPI_ALLOCATE_BUFFER };
@@ -60,21 +75,16 @@ static int vmgenid_add(struct acpi_device *device)
device->driver_data = state;
+ ret = acpi_device_install_event_handler(device, ACPI_DEVICE_NOTIFY, vmgenid_notify);
+
out:
ACPI_FREE(parsed.pointer);
return ret;
}
-static void vmgenid_notify(struct acpi_device *device, u32 event)
+static void vmgenid_remove(struct acpi_device *device)
{
- struct vmgenid_state *state = acpi_driver_data(device);
- u8 old_id[VMGENID_SIZE];
-
- memcpy(old_id, state->this_id, sizeof(old_id));
- memcpy(state->this_id, state->next_id, sizeof(state->this_id));
- if (!memcmp(old_id, state->this_id, sizeof(old_id)))
- return;
- add_vmfork_randomness(state->this_id, sizeof(state->this_id));
+ acpi_device_remove_event_handler(device, ACPI_DEVICE_NOTIFY, vmgenid_notify);
}
static const struct acpi_device_id vmgenid_ids[] = {
@@ -89,7 +99,7 @@ static struct acpi_driver vmgenid_driver = {
.owner = THIS_MODULE,
.ops = {
.add = vmgenid_add,
- .notify = vmgenid_notify
+ .remove = vmgenid_remove,
}
};
Currently logic for installing notifications from ACPI devices is implemented using notify callback in struct acpi_driver. Preparations are being made to replace acpi_driver with more generic struct platform_driver, which doesn't contain notify callback. Furthermore as of now handlers are being called indirectly through acpi_notify_device(), which decreases performance. Call acpi_device_install_event_handler() at the end of .add() callback. Call acpi_device_remove_event_handler() at the beginning of .remove() callback. Change arguments passed to the notify callback to match with what's required by acpi_device_install_event_handler(). Signed-off-by: Michal Wilczynski <michal.wilczynski@intel.com> --- drivers/virt/vmgenid.c | 30 ++++++++++++++++++++---------- 1 file changed, 20 insertions(+), 10 deletions(-)