diff options
Diffstat (limited to 'drivers/s390/cio/vfio_ccw_private.h')
| -rw-r--r-- | drivers/s390/cio/vfio_ccw_private.h | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/drivers/s390/cio/vfio_ccw_private.h b/drivers/s390/cio/vfio_ccw_private.h new file mode 100644 index 000000000000..fc0f01c16ef9 --- /dev/null +++ b/drivers/s390/cio/vfio_ccw_private.h @@ -0,0 +1,96 @@ +/* + * 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_BOXED, + 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 |