struct greybus_host_device *greybus_create_hd(struct greybus_host_driver *driver,
struct device *parent,
size_t buffer_size_max)
{
struct greybus_host_device *hd;
/*
* Validate that the driver implements all of the callbacks
* so that we don't have to every time we make them.
*/
if ((!driver->message_send) || (!driver->message_cancel)) {
pr_err("Must implement all greybus_host_driver callbacks!\n");
return ERR_PTR(-EINVAL);
}
if (buffer_size_max < GB_OPERATION_MESSAGE_SIZE_MIN) {
dev_err(parent, "greybus host-device buffers too small\n");
return NULL;
}
/*
* Make sure to never allocate messages larger than what the Greybus
* protocol supports.
*/
if (buffer_size_max > GB_OPERATION_MESSAGE_SIZE_MAX) {
dev_warn(parent, "limiting buffer size to %u\n",
GB_OPERATION_MESSAGE_SIZE_MAX);
buffer_size_max = GB_OPERATION_MESSAGE_SIZE_MAX;
}
hd = kzalloc(sizeof(*hd) + driver->hd_priv_size, GFP_KERNEL);
if (!hd)
return ERR_PTR(-ENOMEM);
kref_init(&hd->kref);
hd->parent = parent;
hd->driver = driver;
INIT_LIST_HEAD(&hd->interfaces);
INIT_LIST_HEAD(&hd->connections);
ida_init(&hd->cport_id_map);
hd->buffer_size_max = buffer_size_max;
/*
* Initialize AP's SVC protocol connection:
*
* This is required as part of early initialization of the host device
* as we need this connection in order to start any kind of message
* exchange between the AP and the SVC. SVC will start with a
* 'get-version' request followed by a 'svc-hello' message and at that
* time we will create a fully initialized svc-connection, as we need
* endo-id and AP's interface id for that.
*/
if (!gb_ap_svc_connection_create(hd)) {
kref_put_mutex(&hd->kref, free_hd, &hd_mutex);
return ERR_PTR(-ENOMEM);
}
return hd;
}
static void
i915_gem_userptr_release__mm_struct(struct drm_i915_gem_object *obj)
{
if (obj->userptr.mm == NULL)
return;
kref_put_mutex(&obj->userptr.mm->kref,
__i915_mm_struct_free,
&to_i915(obj->base.dev)->mm_lock);
obj->userptr.mm = NULL;
}
void greybus_remove_hd(struct greybus_host_device *hd)
{
/*
* Tear down all interfaces, modules, and the endo that is associated
* with this host controller before freeing the memory associated with
* the host controller.
*/
gb_interfaces_remove(hd);
gb_endo_remove(hd->endo);
/* Is the SVC still using the partially uninitialized connection ? */
if (hd->initial_svc_connection)
gb_connection_destroy(hd->initial_svc_connection);
/*
* Make sure there are no leftovers that can potentially corrupt sysfs.
*/
if (WARN_ON(!list_empty(&hd->connections)))
gb_hd_connections_exit(hd);
kref_put_mutex(&hd->kref, free_hd, &hd_mutex);
}
