/* SPDX-License-Identifier: GPL-2.0 */ /* * Private stuff for vfio_ccw driver * * Copyright IBM Corp. 2017 * * Author(s): Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com> * Xiao Feng Ren <renxiaof@linux.vnet.ibm.com> */ #ifndef _VFIO_CCW_PRIVATE_H_ #define _VFIO_CCW_PRIVATE_H_ #include <linux/completion.h> #include <linux/eventfd.h> #include <linux/workqueue.h> #include <linux/vfio_ccw.h> #include "css.h" #include "vfio_ccw_cp.h" /** * struct vfio_ccw_private * @sch: pointer to the subchannel * @state: internal state of the device * @completion: synchronization helper of the I/O completion * @avail: available for creating a mediated device * @mdev: pointer to the mediated device * @nb: notifier for vfio events * @io_region: MMIO region to input/output I/O arguments/results * @cp: channel program for the current I/O operation * @irb: irb info received from interrupt * @scsw: scsw info * @io_trigger: eventfd ctx for signaling userspace I/O results * @io_work: work for deferral process of I/O handling */ struct vfio_ccw_private { struct subchannel *sch; int state; struct completion *completion; atomic_t avail; struct mdev_device *mdev; struct notifier_block nb; struct ccw_io_region *io_region; struct channel_program cp; struct irb irb; union scsw scsw; struct eventfd_ctx *io_trigger; struct work_struct io_work; } __aligned(8); extern int vfio_ccw_mdev_reg(struct subchannel *sch); extern void vfio_ccw_mdev_unreg(struct subchannel *sch); extern int vfio_ccw_sch_quiesce(struct subchannel *sch); /* * States of the device statemachine. */ enum vfio_ccw_state { VFIO_CCW_STATE_NOT_OPER, VFIO_CCW_STATE_STANDBY, VFIO_CCW_STATE_IDLE, VFIO_CCW_STATE_BUSY, /* last element! */ NR_VFIO_CCW_STATES }; /* * Asynchronous events of the device statemachine. */ enum vfio_ccw_event { VFIO_CCW_EVENT_NOT_OPER, VFIO_CCW_EVENT_IO_REQ, VFIO_CCW_EVENT_INTERRUPT, /* last element! */ NR_VFIO_CCW_EVENTS }; /* * Action called through jumptable. */ typedef void (fsm_func_t)(struct vfio_ccw_private *, enum vfio_ccw_event); extern fsm_func_t *vfio_ccw_jumptable[NR_VFIO_CCW_STATES][NR_VFIO_CCW_EVENTS]; static inline void vfio_ccw_fsm_event(struct vfio_ccw_private *private, int event) { vfio_ccw_jumptable[private->state][event](private, event); } extern struct workqueue_struct *vfio_ccw_work_q; #endif