mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-16 15:34:48 +08:00
24c986748b
The schib region can be used by userspace to get the subchannel- information block (SCHIB) for the passthrough subchannel. This can be useful to get information such as channel path information via the SCHIB.PMCW fields. Signed-off-by: Farhan Ali <alifm@linux.ibm.com> Signed-off-by: Eric Farman <farman@linux.ibm.com> Reviewed-by: Cornelia Huck <cohuck@redhat.com> Message-Id: <20200505122745.53208-5-farman@linux.ibm.com> Signed-off-by: Cornelia Huck <cohuck@redhat.com>
165 lines
4.7 KiB
C
165 lines
4.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* Private stuff for vfio_ccw driver
|
|
*
|
|
* Copyright IBM Corp. 2017
|
|
* Copyright Red Hat, Inc. 2019
|
|
*
|
|
* Author(s): Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
|
|
* Xiao Feng Ren <renxiaof@linux.vnet.ibm.com>
|
|
* Cornelia Huck <cohuck@redhat.com>
|
|
*/
|
|
|
|
#ifndef _VFIO_CCW_PRIVATE_H_
|
|
#define _VFIO_CCW_PRIVATE_H_
|
|
|
|
#include <linux/completion.h>
|
|
#include <linux/eventfd.h>
|
|
#include <linux/workqueue.h>
|
|
#include <linux/vfio_ccw.h>
|
|
#include <asm/debug.h>
|
|
|
|
#include "css.h"
|
|
#include "vfio_ccw_cp.h"
|
|
|
|
#define VFIO_CCW_OFFSET_SHIFT 10
|
|
#define VFIO_CCW_OFFSET_TO_INDEX(off) (off >> VFIO_CCW_OFFSET_SHIFT)
|
|
#define VFIO_CCW_INDEX_TO_OFFSET(index) ((u64)(index) << VFIO_CCW_OFFSET_SHIFT)
|
|
#define VFIO_CCW_OFFSET_MASK (((u64)(1) << VFIO_CCW_OFFSET_SHIFT) - 1)
|
|
|
|
/* capability chain handling similar to vfio-pci */
|
|
struct vfio_ccw_private;
|
|
struct vfio_ccw_region;
|
|
|
|
struct vfio_ccw_regops {
|
|
ssize_t (*read)(struct vfio_ccw_private *private, char __user *buf,
|
|
size_t count, loff_t *ppos);
|
|
ssize_t (*write)(struct vfio_ccw_private *private,
|
|
const char __user *buf, size_t count, loff_t *ppos);
|
|
void (*release)(struct vfio_ccw_private *private,
|
|
struct vfio_ccw_region *region);
|
|
};
|
|
|
|
struct vfio_ccw_region {
|
|
u32 type;
|
|
u32 subtype;
|
|
const struct vfio_ccw_regops *ops;
|
|
void *data;
|
|
size_t size;
|
|
u32 flags;
|
|
};
|
|
|
|
int vfio_ccw_register_dev_region(struct vfio_ccw_private *private,
|
|
unsigned int subtype,
|
|
const struct vfio_ccw_regops *ops,
|
|
size_t size, u32 flags, void *data);
|
|
void vfio_ccw_unregister_dev_regions(struct vfio_ccw_private *private);
|
|
|
|
int vfio_ccw_register_async_dev_regions(struct vfio_ccw_private *private);
|
|
int vfio_ccw_register_schib_dev_regions(struct vfio_ccw_private *private);
|
|
|
|
/**
|
|
* struct vfio_ccw_private
|
|
* @sch: pointer to the subchannel
|
|
* @state: internal state of the device
|
|
* @completion: synchronization helper of the I/O completion
|
|
* @avail: available for creating a mediated device
|
|
* @mdev: pointer to the mediated device
|
|
* @nb: notifier for vfio events
|
|
* @io_region: MMIO region to input/output I/O arguments/results
|
|
* @io_mutex: protect against concurrent update of I/O regions
|
|
* @region: additional regions for other subchannel operations
|
|
* @cmd_region: MMIO region for asynchronous I/O commands other than START
|
|
* @schib_region: MMIO region for SCHIB information
|
|
* @num_regions: number of additional regions
|
|
* @cp: channel program for the current I/O operation
|
|
* @irb: irb info received from interrupt
|
|
* @scsw: scsw info
|
|
* @io_trigger: eventfd ctx for signaling userspace I/O results
|
|
* @io_work: work for deferral process of I/O handling
|
|
*/
|
|
struct vfio_ccw_private {
|
|
struct subchannel *sch;
|
|
int state;
|
|
struct completion *completion;
|
|
atomic_t avail;
|
|
struct mdev_device *mdev;
|
|
struct notifier_block nb;
|
|
struct ccw_io_region *io_region;
|
|
struct mutex io_mutex;
|
|
struct vfio_ccw_region *region;
|
|
struct ccw_cmd_region *cmd_region;
|
|
struct ccw_schib_region *schib_region;
|
|
int num_regions;
|
|
|
|
struct channel_program cp;
|
|
struct irb irb;
|
|
union scsw scsw;
|
|
|
|
struct eventfd_ctx *io_trigger;
|
|
struct work_struct io_work;
|
|
} __aligned(8);
|
|
|
|
extern int vfio_ccw_mdev_reg(struct subchannel *sch);
|
|
extern void vfio_ccw_mdev_unreg(struct subchannel *sch);
|
|
|
|
extern int vfio_ccw_sch_quiesce(struct subchannel *sch);
|
|
|
|
/*
|
|
* States of the device statemachine.
|
|
*/
|
|
enum vfio_ccw_state {
|
|
VFIO_CCW_STATE_NOT_OPER,
|
|
VFIO_CCW_STATE_STANDBY,
|
|
VFIO_CCW_STATE_IDLE,
|
|
VFIO_CCW_STATE_CP_PROCESSING,
|
|
VFIO_CCW_STATE_CP_PENDING,
|
|
/* last element! */
|
|
NR_VFIO_CCW_STATES
|
|
};
|
|
|
|
/*
|
|
* Asynchronous events of the device statemachine.
|
|
*/
|
|
enum vfio_ccw_event {
|
|
VFIO_CCW_EVENT_NOT_OPER,
|
|
VFIO_CCW_EVENT_IO_REQ,
|
|
VFIO_CCW_EVENT_INTERRUPT,
|
|
VFIO_CCW_EVENT_ASYNC_REQ,
|
|
/* last element! */
|
|
NR_VFIO_CCW_EVENTS
|
|
};
|
|
|
|
/*
|
|
* Action called through jumptable.
|
|
*/
|
|
typedef void (fsm_func_t)(struct vfio_ccw_private *, enum vfio_ccw_event);
|
|
extern fsm_func_t *vfio_ccw_jumptable[NR_VFIO_CCW_STATES][NR_VFIO_CCW_EVENTS];
|
|
|
|
static inline void vfio_ccw_fsm_event(struct vfio_ccw_private *private,
|
|
int event)
|
|
{
|
|
trace_vfio_ccw_fsm_event(private->sch->schid, private->state, event);
|
|
vfio_ccw_jumptable[private->state][event](private, event);
|
|
}
|
|
|
|
extern struct workqueue_struct *vfio_ccw_work_q;
|
|
|
|
|
|
/* s390 debug feature, similar to base cio */
|
|
extern debug_info_t *vfio_ccw_debug_msg_id;
|
|
extern debug_info_t *vfio_ccw_debug_trace_id;
|
|
|
|
#define VFIO_CCW_TRACE_EVENT(imp, txt) \
|
|
debug_text_event(vfio_ccw_debug_trace_id, imp, txt)
|
|
|
|
#define VFIO_CCW_MSG_EVENT(imp, args...) \
|
|
debug_sprintf_event(vfio_ccw_debug_msg_id, imp, ##args)
|
|
|
|
static inline void VFIO_CCW_HEX_EVENT(int level, void *data, int length)
|
|
{
|
|
debug_event(vfio_ccw_debug_trace_id, level, data, length);
|
|
}
|
|
|
|
#endif
|