1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Private stuff for vfio_ccw driver 4 * 5 * Copyright IBM Corp. 2017 6 * 7 * Author(s): Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com> 8 * Xiao Feng Ren <renxiaof@linux.vnet.ibm.com> 9 */ 10 11 #ifndef _VFIO_CCW_PRIVATE_H_ 12 #define _VFIO_CCW_PRIVATE_H_ 13 14 #include <linux/completion.h> 15 #include <linux/eventfd.h> 16 #include <linux/workqueue.h> 17 #include <linux/vfio_ccw.h> 18 19 #include "css.h" 20 #include "vfio_ccw_cp.h" 21 22 /** 23 * struct vfio_ccw_private 24 * @sch: pointer to the subchannel 25 * @state: internal state of the device 26 * @completion: synchronization helper of the I/O completion 27 * @avail: available for creating a mediated device 28 * @mdev: pointer to the mediated device 29 * @nb: notifier for vfio events 30 * @io_region: MMIO region to input/output I/O arguments/results 31 * @cp: channel program for the current I/O operation 32 * @irb: irb info received from interrupt 33 * @scsw: scsw info 34 * @io_trigger: eventfd ctx for signaling userspace I/O results 35 * @io_work: work for deferral process of I/O handling 36 */ 37 struct vfio_ccw_private { 38 struct subchannel *sch; 39 int state; 40 struct completion *completion; 41 atomic_t avail; 42 struct mdev_device *mdev; 43 struct notifier_block nb; 44 struct ccw_io_region io_region; 45 46 struct channel_program cp; 47 struct irb irb; 48 union scsw scsw; 49 50 struct eventfd_ctx *io_trigger; 51 struct work_struct io_work; 52 } __aligned(8); 53 54 extern int vfio_ccw_mdev_reg(struct subchannel *sch); 55 extern void vfio_ccw_mdev_unreg(struct subchannel *sch); 56 57 extern int vfio_ccw_sch_quiesce(struct subchannel *sch); 58 59 /* 60 * States of the device statemachine. 61 */ 62 enum vfio_ccw_state { 63 VFIO_CCW_STATE_NOT_OPER, 64 VFIO_CCW_STATE_STANDBY, 65 VFIO_CCW_STATE_IDLE, 66 VFIO_CCW_STATE_BOXED, 67 VFIO_CCW_STATE_BUSY, 68 /* last element! */ 69 NR_VFIO_CCW_STATES 70 }; 71 72 /* 73 * Asynchronous events of the device statemachine. 74 */ 75 enum vfio_ccw_event { 76 VFIO_CCW_EVENT_NOT_OPER, 77 VFIO_CCW_EVENT_IO_REQ, 78 VFIO_CCW_EVENT_INTERRUPT, 79 /* last element! */ 80 NR_VFIO_CCW_EVENTS 81 }; 82 83 /* 84 * Action called through jumptable. 85 */ 86 typedef void (fsm_func_t)(struct vfio_ccw_private *, enum vfio_ccw_event); 87 extern fsm_func_t *vfio_ccw_jumptable[NR_VFIO_CCW_STATES][NR_VFIO_CCW_EVENTS]; 88 89 static inline void vfio_ccw_fsm_event(struct vfio_ccw_private *private, 90 int event) 91 { 92 vfio_ccw_jumptable[private->state][event](private, event); 93 } 94 95 extern struct workqueue_struct *vfio_ccw_work_q; 96 97 #endif 98