The goal of the patch serie is to enhance the state machine by centralizing all state changes inside the state machine wrapper and have a clear view of state changes. Doing this will: - facilitate the introduction of new events received from QEMU (cancel/clear/stsh) or from the hardware (chr events). - produce small, easy to maintain FSM functions with clear incoming events and outgoing states This series introduces new states and events and suppressed others. - VFIO_CCW_STATE_NOT_OPER : when the Sub-Channel is KO - VFIO_CCW_STATE_STANDBY : when it is offline - VFIO_CCW_STATE_IDLE : when it is ready for I/O - VFIO_CCW_STATE_BUSY : when it is busy doing I/O - VFIO_CCW_STATE_QUIESCING: when it is busy going offline - VFIO_CCW_EVENT_INIT : the channel setup (admin) - VFIO_CCW_EVENT_NOT_OPER : something really wrong happened - VFIO_CCW_EVENT_SSCH_REQ : Starting an I/O request (UAPI) - VFIO_CCW_EVENT_INTERRUPT: Receiving an interrupt (callback) - VFIO_CCW_EVENT_SCH_EVENT: Receiving a channel event (callback) - VFIO_CCW_EVENT_ONLINE : Channel is set online (admin) - VFIO_CCW_EVENT_OFFLINE : Channel is set offline (admin) The ABI did not change, so a standard QEMU devel branch can be used. Pierre Morel (10): vfio: ccw: Moving state change out of IRQ context vfio: ccw: Transform FSM functions to return state vfio: ccw: new SCH_EVENT event vfio: ccw: replace IO_REQ event with SSCH_REQ event vfio: ccw: Suppress unused event parameter vfio: ccw: Make FSM functions atomic vfio: ccw: Introduce the INIT event vfio: ccw: Handling reset and shutdown with states vfio: ccw: Suppressing the BOXED state vfio: ccw: Let user wait when busy on IO drivers/s390/cio/vfio_ccw_drv.c | 120 +++++++------------- drivers/s390/cio/vfio_ccw_fsm.c | 215 +++++++++++++++++++++++++----------- drivers/s390/cio/vfio_ccw_ops.c | 58 +++++----- drivers/s390/cio/vfio_ccw_private.h | 21 +++- 4 files changed, 232 insertions(+), 182 deletions(-) -- 2.7.4
