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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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bbe37e4cb8
The current implementation doesn't check if the subchannel is in a proper device state when handling an event. Let's introduce a finite state machine to manage the state/event change. Signed-off-by: Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com> Message-Id: <20170317031743.40128-14-bjsdjshi@linux.vnet.ibm.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
97 lines
2.3 KiB
C
97 lines
2.3 KiB
C
/*
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* Private stuff for vfio_ccw driver
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*
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* Copyright IBM Corp. 2017
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*
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* Author(s): Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
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* Xiao Feng Ren <renxiaof@linux.vnet.ibm.com>
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*/
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#ifndef _VFIO_CCW_PRIVATE_H_
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#define _VFIO_CCW_PRIVATE_H_
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#include <linux/completion.h>
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#include <linux/eventfd.h>
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#include <linux/workqueue.h>
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#include <linux/vfio_ccw.h>
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#include "css.h"
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#include "vfio_ccw_cp.h"
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/**
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* struct vfio_ccw_private
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* @sch: pointer to the subchannel
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* @state: internal state of the device
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* @completion: synchronization helper of the I/O completion
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* @avail: available for creating a mediated device
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* @mdev: pointer to the mediated device
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* @nb: notifier for vfio events
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* @io_region: MMIO region to input/output I/O arguments/results
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* @cp: channel program for the current I/O operation
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* @irb: irb info received from interrupt
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* @scsw: scsw info
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* @io_trigger: eventfd ctx for signaling userspace I/O results
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* @io_work: work for deferral process of I/O handling
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*/
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struct vfio_ccw_private {
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struct subchannel *sch;
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int state;
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struct completion *completion;
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atomic_t avail;
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struct mdev_device *mdev;
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struct notifier_block nb;
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struct ccw_io_region io_region;
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struct channel_program cp;
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struct irb irb;
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union scsw scsw;
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struct eventfd_ctx *io_trigger;
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struct work_struct io_work;
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} __aligned(8);
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extern int vfio_ccw_mdev_reg(struct subchannel *sch);
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extern void vfio_ccw_mdev_unreg(struct subchannel *sch);
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extern int vfio_ccw_sch_quiesce(struct subchannel *sch);
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/*
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* States of the device statemachine.
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*/
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enum vfio_ccw_state {
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VFIO_CCW_STATE_NOT_OPER,
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VFIO_CCW_STATE_STANDBY,
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VFIO_CCW_STATE_IDLE,
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VFIO_CCW_STATE_BOXED,
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VFIO_CCW_STATE_BUSY,
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/* last element! */
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NR_VFIO_CCW_STATES
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};
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/*
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* Asynchronous events of the device statemachine.
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*/
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enum vfio_ccw_event {
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VFIO_CCW_EVENT_NOT_OPER,
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VFIO_CCW_EVENT_IO_REQ,
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VFIO_CCW_EVENT_INTERRUPT,
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/* last element! */
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NR_VFIO_CCW_EVENTS
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};
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/*
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* Action called through jumptable.
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*/
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typedef void (fsm_func_t)(struct vfio_ccw_private *, enum vfio_ccw_event);
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extern fsm_func_t *vfio_ccw_jumptable[NR_VFIO_CCW_STATES][NR_VFIO_CCW_EVENTS];
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static inline void vfio_ccw_fsm_event(struct vfio_ccw_private *private,
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int event)
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{
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vfio_ccw_jumptable[private->state][event](private, event);
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}
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extern struct workqueue_struct *vfio_ccw_work_q;
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#endif
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