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