d5afd5d135
Add a region to the vfio-ccw device that can be used to submit asynchronous I/O instructions. ssch continues to be handled by the existing I/O region; the new region handles hsch and csch. Interrupt status continues to be reported through the same channels as for ssch. Acked-by: Eric Farman <farman@linux.ibm.com> Reviewed-by: Farhan Ali <alifm@linux.ibm.com> Signed-off-by: Cornelia Huck <cohuck@redhat.com>
143 lines
3.9 KiB
C
143 lines
3.9 KiB
C
/* 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 <bjsdjshi@linux.vnet.ibm.com>
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* Xiao Feng Ren <renxiaof@linux.vnet.ibm.com>
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* Cornelia Huck <cohuck@redhat.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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#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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int vfio_ccw_register_async_dev_regions(struct vfio_ccw_private *private);
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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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* @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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* @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 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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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 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_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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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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