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180 lines
5.2 KiB
180 lines
5.2 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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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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* Copyright Red Hat, Inc. 2019 |
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* |
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* Author(s): Dong Jia Shi <[email protected]> |
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* Xiao Feng Ren <[email protected]> |
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* Cornelia Huck <[email protected]> |
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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 <asm/crw.h> |
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#include <asm/debug.h> |
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#include "css.h" |
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#include "vfio_ccw_cp.h" |
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#define VFIO_CCW_OFFSET_SHIFT 10 |
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#define VFIO_CCW_OFFSET_TO_INDEX(off) (off >> VFIO_CCW_OFFSET_SHIFT) |
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#define VFIO_CCW_INDEX_TO_OFFSET(index) ((u64)(index) << VFIO_CCW_OFFSET_SHIFT) |
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#define VFIO_CCW_OFFSET_MASK (((u64)(1) << VFIO_CCW_OFFSET_SHIFT) - 1) |
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/* capability chain handling similar to vfio-pci */ |
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struct vfio_ccw_private; |
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struct vfio_ccw_region; |
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struct vfio_ccw_regops { |
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ssize_t (*read)(struct vfio_ccw_private *private, char __user *buf, |
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size_t count, loff_t *ppos); |
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ssize_t (*write)(struct vfio_ccw_private *private, |
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const char __user *buf, size_t count, loff_t *ppos); |
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void (*release)(struct vfio_ccw_private *private, |
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struct vfio_ccw_region *region); |
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}; |
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struct vfio_ccw_region { |
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u32 type; |
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u32 subtype; |
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const struct vfio_ccw_regops *ops; |
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void *data; |
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size_t size; |
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u32 flags; |
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}; |
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int vfio_ccw_register_dev_region(struct vfio_ccw_private *private, |
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unsigned int subtype, |
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const struct vfio_ccw_regops *ops, |
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size_t size, u32 flags, void *data); |
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void vfio_ccw_unregister_dev_regions(struct vfio_ccw_private *private); |
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int vfio_ccw_register_async_dev_regions(struct vfio_ccw_private *private); |
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int vfio_ccw_register_schib_dev_regions(struct vfio_ccw_private *private); |
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int vfio_ccw_register_crw_dev_regions(struct vfio_ccw_private *private); |
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struct vfio_ccw_crw { |
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struct list_head next; |
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struct crw crw; |
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}; |
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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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* @io_mutex: protect against concurrent update of I/O regions |
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* @region: additional regions for other subchannel operations |
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* @cmd_region: MMIO region for asynchronous I/O commands other than START |
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* @schib_region: MMIO region for SCHIB information |
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* @crw_region: MMIO region for getting channel report words |
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* @num_regions: number of additional regions |
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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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* @crw_trigger: eventfd ctx for signaling userspace CRW information |
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* @req_trigger: eventfd ctx for signaling userspace to return device |
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* @io_work: work for deferral process of I/O handling |
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* @crw_work: work for deferral process of CRW 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 mutex io_mutex; |
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struct vfio_ccw_region *region; |
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struct ccw_cmd_region *cmd_region; |
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struct ccw_schib_region *schib_region; |
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struct ccw_crw_region *crw_region; |
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int num_regions; |
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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 list_head crw; |
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struct eventfd_ctx *io_trigger; |
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struct eventfd_ctx *crw_trigger; |
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struct eventfd_ctx *req_trigger; |
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struct work_struct io_work; |
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struct work_struct crw_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_CP_PROCESSING, |
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VFIO_CCW_STATE_CP_PENDING, |
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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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VFIO_CCW_EVENT_ASYNC_REQ, |
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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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trace_vfio_ccw_fsm_event(private->sch->schid, private->state, event); |
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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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/* s390 debug feature, similar to base cio */ |
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extern debug_info_t *vfio_ccw_debug_msg_id; |
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extern debug_info_t *vfio_ccw_debug_trace_id; |
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#define VFIO_CCW_TRACE_EVENT(imp, txt) \ |
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debug_text_event(vfio_ccw_debug_trace_id, imp, txt) |
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#define VFIO_CCW_MSG_EVENT(imp, args...) \ |
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debug_sprintf_event(vfio_ccw_debug_msg_id, imp, ##args) |
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static inline void VFIO_CCW_HEX_EVENT(int level, void *data, int length) |
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{ |
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debug_event(vfio_ccw_debug_trace_id, level, data, length); |
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} |
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#endif
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