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greybus: connection: implement new connection handling 

Implement the new connection setup and tear-down sequences for control
connections and bundle connections (offloaded and non-offloaded).

Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
This commit is contained in:
Johan Hovold 2016-08-26 12:55:49 +02:00 committed by Greg Kroah-Hartman
parent 77e52b3b0b
commit aac0839ea2
2 changed files with 98 additions and 37 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

129
drivers/staging/greybus/connection.c
View File

@ -13,6 +13,9 @@
#include "greybus_trace.h"
#define GB_CONNECTION_CPORT_QUIESCE_TIMEOUT 1000
static void gb_connection_kref_release(struct kref *kref);
@ -312,6 +315,24 @@ static void gb_connection_hd_cport_disable(struct gb_connection *connection)
}
}
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;
@ -330,34 +351,43 @@ static int gb_connection_hd_cport_flush(struct gb_connection *connection)
return 0;
}
static int
gb_connection_hd_cport_features_enable(struct gb_connection *connection)
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_features_enable)
return 0;
peer_space = sizeof(struct gb_operation_msg_hdr) +
sizeof(struct gb_cport_shutdown_request);
ret = hd->driver->cport_features_enable(hd, connection->hd_cport_id);
if (connection->mode_switch)
peer_space += sizeof(struct gb_operation_msg_hdr);
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 enable CPort features: %d\n",
connection->name, ret);
dev_err(&hd->dev, "%s: failed to quiesce host cport: %d\n",
connection->name, ret);
return ret;
}
return 0;
}
static void
gb_connection_hd_cport_features_disable(struct gb_connection *connection)
static int gb_connection_hd_cport_clear(struct gb_connection *connection)
{
struct gb_host_device *hd = connection->hd;
int ret;
if (!hd->driver->cport_features_disable)
return;
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;
}
hd->driver->cport_features_disable(hd, connection->hd_cport_id);
return 0;
}
/*
@ -496,18 +526,23 @@ gb_connection_control_disconnected(struct gb_connection *connection)
}
}
static int gb_connection_ping_operation(struct gb_connection *connection)
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_PING,
0, 0, 0,
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);
@ -515,32 +550,47 @@ static int gb_connection_ping_operation(struct gb_connection *connection)
return ret;
}
static int gb_connection_ping(struct gb_connection *connection)
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 (!hd->driver->cport_ping)
if (!drv->cport_shutdown)
return 0;
ret = hd->driver->cport_ping(hd, connection->hd_cport_id);
ret = drv->cport_shutdown(hd, connection->hd_cport_id, phase,
GB_OPERATION_TIMEOUT_DEFAULT);
} else {
ret = gb_connection_ping_operation(connection);
ret = gb_connection_shutdown_operation(connection, phase);
}
if (ret) {
dev_err(&hd->dev, "%s: failed to send ping: %d\n",
connection->name, 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.
*
@ -639,9 +689,9 @@ static int _gb_connection_enable(struct gb_connection *connection, bool rx)
ret = gb_connection_svc_connection_create(connection);
if (ret)
goto err_hd_cport_disable;
goto err_hd_cport_clear;
ret = gb_connection_hd_cport_features_enable(connection);
ret = gb_connection_hd_cport_connected(connection);
if (ret)
goto err_svc_connection_destroy;
@ -659,8 +709,6 @@ static int _gb_connection_enable(struct gb_connection *connection, bool rx)
return 0;
err_control_disconnecting:
gb_connection_control_disconnecting(connection);
spin_lock_irq(&connection->lock);
connection->state = GB_CONNECTION_STATE_DISCONNECTING;
gb_connection_cancel_operations(connection, -ESHUTDOWN);
@ -669,13 +717,17 @@ err_control_disconnecting:
/* Transmit queue should already be empty. */
gb_connection_hd_cport_flush(connection);
gb_connection_ping(connection);
gb_connection_hd_cport_features_disable(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_disable:
err_hd_cport_clear:
gb_connection_hd_cport_clear(connection);
gb_connection_hd_cport_disable(connection);
return ret;
@ -754,7 +806,10 @@ void gb_connection_mode_switch_prepare(struct gb_connection *connection)
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;
}
@ -767,8 +822,6 @@ void gb_connection_disable(struct gb_connection *connection)
trace_gb_connection_disable(connection);
gb_connection_control_disconnecting(connection);
spin_lock_irq(&connection->lock);
connection->state = GB_CONNECTION_STATE_DISCONNECTING;
gb_connection_cancel_operations(connection, -ESHUTDOWN);
@ -776,9 +829,10 @@ void gb_connection_disable(struct gb_connection *connection)
gb_connection_hd_cport_flush(connection);
gb_connection_ping(connection);
gb_connection_hd_cport_features_disable(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;
@ -786,6 +840,8 @@ void gb_connection_disable(struct gb_connection *connection)
/* 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);
}
@ -810,10 +866,11 @@ void gb_connection_disable_forced(struct gb_connection *connection)
spin_unlock_irq(&connection->lock);
gb_connection_hd_cport_flush(connection);
gb_connection_hd_cport_features_disable(connection);
gb_connection_svc_connection_destroy(connection);
gb_connection_hd_cport_disable(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);
}

6
drivers/staging/greybus/greybus_protocols.h
View File

@ -96,9 +96,13 @@ struct gb_operation_msg_hdr {
/* Generic request types */
#define GB_REQUEST_TYPE_PING 0x00
#define GB_REQUEST_TYPE_CPORT_SHUTDOWN 0x00
#define GB_REQUEST_TYPE_INVALID 0x7f
struct gb_cport_shutdown_request {
__u8 phase;
} __packed;
/* Control Protocol */