projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 63f1934d DJS |
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 | ||
| 4e149e43 | 14 | #include <linux/completion.h> |
| 120e214e | 15 | #include <linux/eventfd.h> |
| e5f84dba | 16 | #include <linux/workqueue.h> |
| 060d2b5a DJS |
17 | #include <linux/vfio_ccw.h> |
| 18 | ||
| 63f1934d | 19 | #include "css.h" |
| 4e149e43 | 20 | #include "vfio_ccw_cp.h" |
| 63f1934d DJS |
21 | |
| 22 | /** | |
| 23 | * struct vfio_ccw_private | |
| 24 | * @sch: pointer to the subchannel | |
| bbe37e4c | 25 | * @state: internal state of the device |
| 63f1934d | 26 | * @completion: synchronization helper of the I/O completion |
| 84cd8fc4 DJS |
27 | * @avail: available for creating a mediated device |
| 28 | * @mdev: pointer to the mediated device | |
| 29 | * @nb: notifier for vfio events | |
| 060d2b5a | 30 | * @io_region: MMIO region to input/output I/O arguments/results |
| 4e149e43 DJS |
31 | * @cp: channel program for the current I/O operation |
| 32 | * @irb: irb info received from interrupt | |
| 33 | * @scsw: scsw info | |
| 120e214e | 34 | * @io_trigger: eventfd ctx for signaling userspace I/O results |
| e5f84dba | 35 | * @io_work: work for deferral process of I/O handling |
| 63f1934d DJS |
36 | */ |
| 37 | struct vfio_ccw_private { | |
| 38 | struct subchannel *sch; | |
| bbe37e4c | 39 | int state; |
| 63f1934d | 40 | struct completion *completion; |
| 84cd8fc4 DJS |
41 | atomic_t avail; |
| 42 | struct mdev_device *mdev; | |
| 43 | struct notifier_block nb; | |
| 060d2b5a | 44 | struct ccw_io_region io_region; |
| 4e149e43 | 45 | |
| 4e149e43 DJS |
46 | struct channel_program cp; |
| 47 | struct irb irb; | |
| 48 | union scsw scsw; | |
| 120e214e DJS |
49 | |
| 50 | struct eventfd_ctx *io_trigger; | |
| e5f84dba | 51 | struct work_struct io_work; |
| 63f1934d DJS |
52 | } __aligned(8); |
| 53 | ||
| 84cd8fc4 DJS |
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); | |
| bbe37e4c DJS |
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; | |
| 84cd8fc4 | 96 | |
| 63f1934d | 97 | #endif |