diff options
Diffstat (limited to 'drivers/staging/greybus/connection.c')
| -rw-r--r-- | drivers/staging/greybus/connection.c | 942 |
1 files changed, 0 insertions, 942 deletions
diff --git a/drivers/staging/greybus/connection.c b/drivers/staging/greybus/connection.c deleted file mode 100644 index eda964208cce..000000000000 --- a/drivers/staging/greybus/connection.c +++ /dev/null @@ -1,942 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * Greybus connections - * - * Copyright 2014 Google Inc. - * Copyright 2014 Linaro Ltd. - */ - -#include <linux/workqueue.h> - -#include "greybus.h" -#include "greybus_trace.h" - -#define GB_CONNECTION_CPORT_QUIESCE_TIMEOUT 1000 - -static void gb_connection_kref_release(struct kref *kref); - -static DEFINE_SPINLOCK(gb_connections_lock); -static DEFINE_MUTEX(gb_connection_mutex); - -/* Caller holds gb_connection_mutex. */ -static bool gb_connection_cport_in_use(struct gb_interface *intf, u16 cport_id) -{ - struct gb_host_device *hd = intf->hd; - struct gb_connection *connection; - - list_for_each_entry(connection, &hd->connections, hd_links) { - if (connection->intf == intf && - connection->intf_cport_id == cport_id) - return true; - } - - return false; -} - -static void gb_connection_get(struct gb_connection *connection) -{ - kref_get(&connection->kref); - - trace_gb_connection_get(connection); -} - -static void gb_connection_put(struct gb_connection *connection) -{ - trace_gb_connection_put(connection); - - kref_put(&connection->kref, gb_connection_kref_release); -} - -/* - * Returns a reference-counted pointer to the connection if found. - */ -static struct gb_connection * -gb_connection_hd_find(struct gb_host_device *hd, u16 cport_id) -{ - struct gb_connection *connection; - unsigned long flags; - - spin_lock_irqsave(&gb_connections_lock, flags); - list_for_each_entry(connection, &hd->connections, hd_links) - if (connection->hd_cport_id == cport_id) { - gb_connection_get(connection); - goto found; - } - connection = NULL; -found: - spin_unlock_irqrestore(&gb_connections_lock, flags); - - return connection; -} - -/* - * Callback from the host driver to let us know that data has been - * received on the bundle. - */ -void greybus_data_rcvd(struct gb_host_device *hd, u16 cport_id, - u8 *data, size_t length) -{ - struct gb_connection *connection; - - trace_gb_hd_in(hd); - - connection = gb_connection_hd_find(hd, cport_id); - if (!connection) { - dev_err(&hd->dev, - "nonexistent connection (%zu bytes dropped)\n", length); - return; - } - gb_connection_recv(connection, data, length); - gb_connection_put(connection); -} -EXPORT_SYMBOL_GPL(greybus_data_rcvd); - -static void gb_connection_kref_release(struct kref *kref) -{ - struct gb_connection *connection; - - connection = container_of(kref, struct gb_connection, kref); - - trace_gb_connection_release(connection); - - kfree(connection); -} - -static void gb_connection_init_name(struct gb_connection *connection) -{ - u16 hd_cport_id = connection->hd_cport_id; - u16 cport_id = 0; - u8 intf_id = 0; - - if (connection->intf) { - intf_id = connection->intf->interface_id; - cport_id = connection->intf_cport_id; - } - - snprintf(connection->name, sizeof(connection->name), - "%u/%u:%u", hd_cport_id, intf_id, cport_id); -} - -/* - * _gb_connection_create() - create a Greybus connection - * @hd: host device of the connection - * @hd_cport_id: host-device cport id, or -1 for dynamic allocation - * @intf: remote interface, or NULL for static connections - * @bundle: remote-interface bundle (may be NULL) - * @cport_id: remote-interface cport id, or 0 for static connections - * @handler: request handler (may be NULL) - * @flags: connection flags - * - * Create a Greybus connection, representing the bidirectional link - * between a CPort on a (local) Greybus host device and a CPort on - * another Greybus interface. - * - * A connection also maintains the state of operations sent over the - * connection. - * - * Serialised against concurrent create and destroy using the - * gb_connection_mutex. - * - * Return: A pointer to the new connection if successful, or an ERR_PTR - * otherwise. - */ -static struct gb_connection * -_gb_connection_create(struct gb_host_device *hd, int hd_cport_id, - struct gb_interface *intf, - struct gb_bundle *bundle, int cport_id, - gb_request_handler_t handler, - unsigned long flags) -{ - struct gb_connection *connection; - int ret; - - mutex_lock(&gb_connection_mutex); - - if (intf && gb_connection_cport_in_use(intf, cport_id)) { - dev_err(&intf->dev, "cport %u already in use\n", cport_id); - ret = -EBUSY; - goto err_unlock; - } - - ret = gb_hd_cport_allocate(hd, hd_cport_id, flags); - if (ret < 0) { - dev_err(&hd->dev, "failed to allocate cport: %d\n", ret); - goto err_unlock; - } - hd_cport_id = ret; - - connection = kzalloc(sizeof(*connection), GFP_KERNEL); - if (!connection) { - ret = -ENOMEM; - goto err_hd_cport_release; - } - - connection->hd_cport_id = hd_cport_id; - connection->intf_cport_id = cport_id; - connection->hd = hd; - connection->intf = intf; - connection->bundle = bundle; - connection->handler = handler; - connection->flags = flags; - if (intf && (intf->quirks & GB_INTERFACE_QUIRK_NO_CPORT_FEATURES)) - connection->flags |= GB_CONNECTION_FLAG_NO_FLOWCTRL; - connection->state = GB_CONNECTION_STATE_DISABLED; - - atomic_set(&connection->op_cycle, 0); - mutex_init(&connection->mutex); - spin_lock_init(&connection->lock); - INIT_LIST_HEAD(&connection->operations); - - connection->wq = alloc_workqueue("%s:%d", WQ_UNBOUND, 1, - dev_name(&hd->dev), hd_cport_id); - if (!connection->wq) { - ret = -ENOMEM; - goto err_free_connection; - } - - kref_init(&connection->kref); - - gb_connection_init_name(connection); - - spin_lock_irq(&gb_connections_lock); - list_add(&connection->hd_links, &hd->connections); - - if (bundle) - list_add(&connection->bundle_links, &bundle->connections); - else - INIT_LIST_HEAD(&connection->bundle_links); - - spin_unlock_irq(&gb_connections_lock); - - mutex_unlock(&gb_connection_mutex); - - trace_gb_connection_create(connection); - - return connection; - -err_free_connection: - kfree(connection); -err_hd_cport_release: - gb_hd_cport_release(hd, hd_cport_id); -err_unlock: - mutex_unlock(&gb_connection_mutex); - - return ERR_PTR(ret); -} - -struct gb_connection * -gb_connection_create_static(struct gb_host_device *hd, u16 hd_cport_id, - gb_request_handler_t handler) -{ - return _gb_connection_create(hd, hd_cport_id, NULL, NULL, 0, handler, - GB_CONNECTION_FLAG_HIGH_PRIO); -} - -struct gb_connection * -gb_connection_create_control(struct gb_interface *intf) -{ - return _gb_connection_create(intf->hd, -1, intf, NULL, 0, NULL, - GB_CONNECTION_FLAG_CONTROL | - GB_CONNECTION_FLAG_HIGH_PRIO); -} - -struct gb_connection * -gb_connection_create(struct gb_bundle *bundle, u16 cport_id, - gb_request_handler_t handler) -{ - struct gb_interface *intf = bundle->intf; - - return _gb_connection_create(intf->hd, -1, intf, bundle, cport_id, - handler, 0); -} -EXPORT_SYMBOL_GPL(gb_connection_create); - -struct gb_connection * -gb_connection_create_flags(struct gb_bundle *bundle, u16 cport_id, - gb_request_handler_t handler, - unsigned long flags) -{ - struct gb_interface *intf = bundle->intf; - - if (WARN_ON_ONCE(flags & GB_CONNECTION_FLAG_CORE_MASK)) - flags &= ~GB_CONNECTION_FLAG_CORE_MASK; - - return _gb_connection_create(intf->hd, -1, intf, bundle, cport_id, - handler, flags); -} -EXPORT_SYMBOL_GPL(gb_connection_create_flags); - -struct gb_connection * -gb_connection_create_offloaded(struct gb_bundle *bundle, u16 cport_id, - unsigned long flags) -{ - flags |= GB_CONNECTION_FLAG_OFFLOADED; - - return gb_connection_create_flags(bundle, cport_id, NULL, flags); -} -EXPORT_SYMBOL_GPL(gb_connection_create_offloaded); - -static int gb_connection_hd_cport_enable(struct gb_connection *connection) -{ - struct gb_host_device *hd = connection->hd; - int ret; - - if (!hd->driver->cport_enable) - return 0; - - ret = hd->driver->cport_enable(hd, connection->hd_cport_id, - connection->flags); - if (ret) { - dev_err(&hd->dev, "%s: failed to enable host cport: %d\n", - connection->name, ret); - return ret; - } - - return 0; -} - -static void gb_connection_hd_cport_disable(struct gb_connection *connection) -{ - struct gb_host_device *hd = connection->hd; - int ret; - - if (!hd->driver->cport_disable) - return; - - ret = hd->driver->cport_disable(hd, connection->hd_cport_id); - if (ret) { - dev_err(&hd->dev, "%s: failed to disable host cport: %d\n", - connection->name, ret); - } -} - -static int gb_connection_hd_cport_connected(struct gb_connection *connection) -{ - struct gb_host_device *hd = connection->hd; - int ret; - - if (!hd->driver->cport_connected) - return 0; - - ret = hd->driver->cport_connected(hd, connection->hd_cport_id); - if (ret) { - dev_err(&hd->dev, "%s: failed to set connected state: %d\n", - connection->name, ret); - return ret; - } - - return 0; -} - -static int gb_connection_hd_cport_flush(struct gb_connection *connection) -{ - struct gb_host_device *hd = connection->hd; - int ret; - - if (!hd->driver->cport_flush) - return 0; - - ret = hd->driver->cport_flush(hd, connection->hd_cport_id); - if (ret) { - dev_err(&hd->dev, "%s: failed to flush host cport: %d\n", - connection->name, ret); - return ret; - } - - return 0; -} - -static int gb_connection_hd_cport_quiesce(struct gb_connection *connection) -{ - struct gb_host_device *hd = connection->hd; - size_t peer_space; - int ret; - - if (!hd->driver->cport_quiesce) - return 0; - - peer_space = sizeof(struct gb_operation_msg_hdr) + - sizeof(struct gb_cport_shutdown_request); - - if (connection->mode_switch) - peer_space += sizeof(struct gb_operation_msg_hdr); - - if (!hd->driver->cport_quiesce) - return 0; - - ret = hd->driver->cport_quiesce(hd, connection->hd_cport_id, - peer_space, - GB_CONNECTION_CPORT_QUIESCE_TIMEOUT); - if (ret) { - dev_err(&hd->dev, "%s: failed to quiesce host cport: %d\n", - connection->name, ret); - return ret; - } - - return 0; -} - -static int gb_connection_hd_cport_clear(struct gb_connection *connection) -{ - struct gb_host_device *hd = connection->hd; - int ret; - - if (!hd->driver->cport_clear) - return 0; - - ret = hd->driver->cport_clear(hd, connection->hd_cport_id); - if (ret) { - dev_err(&hd->dev, "%s: failed to clear host cport: %d\n", - connection->name, ret); - return ret; - } - - return 0; -} - -/* - * Request the SVC to create a connection from AP's cport to interface's - * cport. - */ -static int -gb_connection_svc_connection_create(struct gb_connection *connection) -{ - struct gb_host_device *hd = connection->hd; - struct gb_interface *intf; - u8 cport_flags; - int ret; - - if (gb_connection_is_static(connection)) - return 0; - - intf = connection->intf; - - /* - * Enable either E2EFC or CSD, unless no flow control is requested. - */ - cport_flags = GB_SVC_CPORT_FLAG_CSV_N; - if (gb_connection_flow_control_disabled(connection)) { - cport_flags |= GB_SVC_CPORT_FLAG_CSD_N; - } else if (gb_connection_e2efc_enabled(connection)) { - cport_flags |= GB_SVC_CPORT_FLAG_CSD_N | - GB_SVC_CPORT_FLAG_E2EFC; - } - - ret = gb_svc_connection_create(hd->svc, - hd->svc->ap_intf_id, - connection->hd_cport_id, - intf->interface_id, - connection->intf_cport_id, - cport_flags); - if (ret) { - dev_err(&connection->hd->dev, - "%s: failed to create svc connection: %d\n", - connection->name, ret); - return ret; - } - - return 0; -} - -static void -gb_connection_svc_connection_destroy(struct gb_connection *connection) -{ - if (gb_connection_is_static(connection)) - return; - - gb_svc_connection_destroy(connection->hd->svc, - connection->hd->svc->ap_intf_id, - connection->hd_cport_id, - connection->intf->interface_id, - connection->intf_cport_id); -} - -/* Inform Interface about active CPorts */ -static int gb_connection_control_connected(struct gb_connection *connection) -{ - struct gb_control *control; - u16 cport_id = connection->intf_cport_id; - int ret; - - if (gb_connection_is_static(connection)) - return 0; - - if (gb_connection_is_control(connection)) - return 0; - - control = connection->intf->control; - - ret = gb_control_connected_operation(control, cport_id); - if (ret) { - dev_err(&connection->bundle->dev, - "failed to connect cport: %d\n", ret); - return ret; - } - - return 0; -} - -static void -gb_connection_control_disconnecting(struct gb_connection *connection) -{ - struct gb_control *control; - u16 cport_id = connection->intf_cport_id; - int ret; - - if (gb_connection_is_static(connection)) - return; - - control = connection->intf->control; - - ret = gb_control_disconnecting_operation(control, cport_id); - if (ret) { - dev_err(&connection->hd->dev, - "%s: failed to send disconnecting: %d\n", - connection->name, ret); - } -} - -static void -gb_connection_control_disconnected(struct gb_connection *connection) -{ - struct gb_control *control; - u16 cport_id = connection->intf_cport_id; - int ret; - - if (gb_connection_is_static(connection)) - return; - - control = connection->intf->control; - - if (gb_connection_is_control(connection)) { - if (connection->mode_switch) { - ret = gb_control_mode_switch_operation(control); - if (ret) { - /* - * Allow mode switch to time out waiting for - * mailbox event. - */ - return; - } - } - - return; - } - - ret = gb_control_disconnected_operation(control, cport_id); - if (ret) { - dev_warn(&connection->bundle->dev, - "failed to disconnect cport: %d\n", ret); - } -} - -static int gb_connection_shutdown_operation(struct gb_connection *connection, - u8 phase) -{ - struct gb_cport_shutdown_request *req; - struct gb_operation *operation; - int ret; - - operation = gb_operation_create_core(connection, - GB_REQUEST_TYPE_CPORT_SHUTDOWN, - sizeof(*req), 0, 0, - GFP_KERNEL); - if (!operation) - return -ENOMEM; - - req = operation->request->payload; - req->phase = phase; - - ret = gb_operation_request_send_sync(operation); - - gb_operation_put(operation); - - return ret; -} - -static int gb_connection_cport_shutdown(struct gb_connection *connection, - u8 phase) -{ - struct gb_host_device *hd = connection->hd; - const struct gb_hd_driver *drv = hd->driver; - int ret; - - if (gb_connection_is_static(connection)) - return 0; - - if (gb_connection_is_offloaded(connection)) { - if (!drv->cport_shutdown) - return 0; - - ret = drv->cport_shutdown(hd, connection->hd_cport_id, phase, - GB_OPERATION_TIMEOUT_DEFAULT); - } else { - ret = gb_connection_shutdown_operation(connection, phase); - } - - if (ret) { - dev_err(&hd->dev, "%s: failed to send cport shutdown (phase %d): %d\n", - connection->name, phase, ret); - return ret; - } - - return 0; -} - -static int -gb_connection_cport_shutdown_phase_1(struct gb_connection *connection) -{ - return gb_connection_cport_shutdown(connection, 1); -} - -static int -gb_connection_cport_shutdown_phase_2(struct gb_connection *connection) -{ - return gb_connection_cport_shutdown(connection, 2); -} - -/* - * Cancel all active operations on a connection. - * - * Locking: Called with connection lock held and state set to DISABLED or - * DISCONNECTING. - */ -static void gb_connection_cancel_operations(struct gb_connection *connection, - int errno) - __must_hold(&connection->lock) -{ - struct gb_operation *operation; - - while (!list_empty(&connection->operations)) { - operation = list_last_entry(&connection->operations, - struct gb_operation, links); - gb_operation_get(operation); - spin_unlock_irq(&connection->lock); - - if (gb_operation_is_incoming(operation)) - gb_operation_cancel_incoming(operation, errno); - else - gb_operation_cancel(operation, errno); - - gb_operation_put(operation); - - spin_lock_irq(&connection->lock); - } -} - -/* - * Cancel all active incoming operations on a connection. - * - * Locking: Called with connection lock held and state set to ENABLED_TX. - */ -static void -gb_connection_flush_incoming_operations(struct gb_connection *connection, - int errno) - __must_hold(&connection->lock) -{ - struct gb_operation *operation; - bool incoming; - - while (!list_empty(&connection->operations)) { - incoming = false; - list_for_each_entry(operation, &connection->operations, - links) { - if (gb_operation_is_incoming(operation)) { - gb_operation_get(operation); - incoming = true; - break; - } - } - - if (!incoming) - break; - - spin_unlock_irq(&connection->lock); - - /* FIXME: flush, not cancel? */ - gb_operation_cancel_incoming(operation, errno); - gb_operation_put(operation); - - spin_lock_irq(&connection->lock); - } -} - -/* - * _gb_connection_enable() - enable a connection - * @connection: connection to enable - * @rx: whether to enable incoming requests - * - * Connection-enable helper for DISABLED->ENABLED, DISABLED->ENABLED_TX, and - * ENABLED_TX->ENABLED state transitions. - * - * Locking: Caller holds connection->mutex. - */ -static int _gb_connection_enable(struct gb_connection *connection, bool rx) -{ - int ret; - - /* Handle ENABLED_TX -> ENABLED transitions. */ - if (connection->state == GB_CONNECTION_STATE_ENABLED_TX) { - if (!(connection->handler && rx)) - return 0; - - spin_lock_irq(&connection->lock); - connection->state = GB_CONNECTION_STATE_ENABLED; - spin_unlock_irq(&connection->lock); - - return 0; - } - - ret = gb_connection_hd_cport_enable(connection); - if (ret) - return ret; - - ret = gb_connection_svc_connection_create(connection); - if (ret) - goto err_hd_cport_clear; - - ret = gb_connection_hd_cport_connected(connection); - if (ret) - goto err_svc_connection_destroy; - - spin_lock_irq(&connection->lock); - if (connection->handler && rx) - connection->state = GB_CONNECTION_STATE_ENABLED; - else - connection->state = GB_CONNECTION_STATE_ENABLED_TX; - spin_unlock_irq(&connection->lock); - - ret = gb_connection_control_connected(connection); - if (ret) - goto err_control_disconnecting; - - return 0; - -err_control_disconnecting: - spin_lock_irq(&connection->lock); - connection->state = GB_CONNECTION_STATE_DISCONNECTING; - gb_connection_cancel_operations(connection, -ESHUTDOWN); - spin_unlock_irq(&connection->lock); - - /* Transmit queue should already be empty. */ - gb_connection_hd_cport_flush(connection); - - gb_connection_control_disconnecting(connection); - gb_connection_cport_shutdown_phase_1(connection); - gb_connection_hd_cport_quiesce(connection); - gb_connection_cport_shutdown_phase_2(connection); - gb_connection_control_disconnected(connection); - connection->state = GB_CONNECTION_STATE_DISABLED; -err_svc_connection_destroy: - gb_connection_svc_connection_destroy(connection); -err_hd_cport_clear: - gb_connection_hd_cport_clear(connection); - - gb_connection_hd_cport_disable(connection); - - return ret; -} - -int gb_connection_enable(struct gb_connection *connection) -{ - int ret = 0; - - mutex_lock(&connection->mutex); - - if (connection->state == GB_CONNECTION_STATE_ENABLED) - goto out_unlock; - - ret = _gb_connection_enable(connection, true); - if (!ret) - trace_gb_connection_enable(connection); - -out_unlock: - mutex_unlock(&connection->mutex); - - return ret; -} -EXPORT_SYMBOL_GPL(gb_connection_enable); - -int gb_connection_enable_tx(struct gb_connection *connection) -{ - int ret = 0; - - mutex_lock(&connection->mutex); - - if (connection->state == GB_CONNECTION_STATE_ENABLED) { - ret = -EINVAL; - goto out_unlock; - } - - if (connection->state == GB_CONNECTION_STATE_ENABLED_TX) - goto out_unlock; - - ret = _gb_connection_enable(connection, false); - if (!ret) - trace_gb_connection_enable(connection); - -out_unlock: - mutex_unlock(&connection->mutex); - - return ret; -} -EXPORT_SYMBOL_GPL(gb_connection_enable_tx); - -void gb_connection_disable_rx(struct gb_connection *connection) -{ - mutex_lock(&connection->mutex); - - spin_lock_irq(&connection->lock); - if (connection->state != GB_CONNECTION_STATE_ENABLED) { - spin_unlock_irq(&connection->lock); - goto out_unlock; - } - connection->state = GB_CONNECTION_STATE_ENABLED_TX; - gb_connection_flush_incoming_operations(connection, -ESHUTDOWN); - spin_unlock_irq(&connection->lock); - - trace_gb_connection_disable(connection); - -out_unlock: - mutex_unlock(&connection->mutex); -} -EXPORT_SYMBOL_GPL(gb_connection_disable_rx); - -void gb_connection_mode_switch_prepare(struct gb_connection *connection) -{ - connection->mode_switch = true; -} - -void gb_connection_mode_switch_complete(struct gb_connection *connection) -{ - gb_connection_svc_connection_destroy(connection); - gb_connection_hd_cport_clear(connection); - - gb_connection_hd_cport_disable(connection); - - connection->mode_switch = false; -} - -void gb_connection_disable(struct gb_connection *connection) -{ - mutex_lock(&connection->mutex); - - if (connection->state == GB_CONNECTION_STATE_DISABLED) - goto out_unlock; - - trace_gb_connection_disable(connection); - - spin_lock_irq(&connection->lock); - connection->state = GB_CONNECTION_STATE_DISCONNECTING; - gb_connection_cancel_operations(connection, -ESHUTDOWN); - spin_unlock_irq(&connection->lock); - - gb_connection_hd_cport_flush(connection); - - gb_connection_control_disconnecting(connection); - gb_connection_cport_shutdown_phase_1(connection); - gb_connection_hd_cport_quiesce(connection); - gb_connection_cport_shutdown_phase_2(connection); - gb_connection_control_disconnected(connection); - - connection->state = GB_CONNECTION_STATE_DISABLED; - - /* control-connection tear down is deferred when mode switching */ - if (!connection->mode_switch) { - gb_connection_svc_connection_destroy(connection); - gb_connection_hd_cport_clear(connection); - - gb_connection_hd_cport_disable(connection); - } - -out_unlock: - mutex_unlock(&connection->mutex); -} -EXPORT_SYMBOL_GPL(gb_connection_disable); - -/* Disable a connection without communicating with the remote end. */ -void gb_connection_disable_forced(struct gb_connection *connection) -{ - mutex_lock(&connection->mutex); - - if (connection->state == GB_CONNECTION_STATE_DISABLED) - goto out_unlock; - - trace_gb_connection_disable(connection); - - spin_lock_irq(&connection->lock); - connection->state = GB_CONNECTION_STATE_DISABLED; - gb_connection_cancel_operations(connection, -ESHUTDOWN); - spin_unlock_irq(&connection->lock); - - gb_connection_hd_cport_flush(connection); - - gb_connection_svc_connection_destroy(connection); - gb_connection_hd_cport_clear(connection); - - gb_connection_hd_cport_disable(connection); -out_unlock: - mutex_unlock(&connection->mutex); -} -EXPORT_SYMBOL_GPL(gb_connection_disable_forced); - -/* Caller must have disabled the connection before destroying it. */ -void gb_connection_destroy(struct gb_connection *connection) -{ - if (!connection) - return; - - if (WARN_ON(connection->state != GB_CONNECTION_STATE_DISABLED)) - gb_connection_disable(connection); - - mutex_lock(&gb_connection_mutex); - - spin_lock_irq(&gb_connections_lock); - list_del(&connection->bundle_links); - list_del(&connection->hd_links); - spin_unlock_irq(&gb_connections_lock); - - destroy_workqueue(connection->wq); - - gb_hd_cport_release(connection->hd, connection->hd_cport_id); - connection->hd_cport_id = CPORT_ID_BAD; - - mutex_unlock(&gb_connection_mutex); - - gb_connection_put(connection); -} -EXPORT_SYMBOL_GPL(gb_connection_destroy); - -void gb_connection_latency_tag_enable(struct gb_connection *connection) -{ - struct gb_host_device *hd = connection->hd; - int ret; - - if (!hd->driver->latency_tag_enable) - return; - - ret = hd->driver->latency_tag_enable(hd, connection->hd_cport_id); - if (ret) { - dev_err(&connection->hd->dev, - "%s: failed to enable latency tag: %d\n", - connection->name, ret); - } -} -EXPORT_SYMBOL_GPL(gb_connection_latency_tag_enable); - -void gb_connection_latency_tag_disable(struct gb_connection *connection) -{ - struct gb_host_device *hd = connection->hd; - int ret; - - if (!hd->driver->latency_tag_disable) - return; - - ret = hd->driver->latency_tag_disable(hd, connection->hd_cport_id); - if (ret) { - dev_err(&connection->hd->dev, - "%s: failed to disable latency tag: %d\n", - connection->name, ret); - } -} -EXPORT_SYMBOL_GPL(gb_connection_latency_tag_disable); |