diff options
Diffstat (limited to 'drivers/s390/cio/vfio_ccw_private.h')
| -rw-r--r-- | drivers/s390/cio/vfio_ccw_private.h | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/drivers/s390/cio/vfio_ccw_private.h b/drivers/s390/cio/vfio_ccw_private.h new file mode 100644 index 000000000..8723156b2 --- /dev/null +++ b/drivers/s390/cio/vfio_ccw_private.h @@ -0,0 +1,176 @@ +/* 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/crw.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); +int vfio_ccw_register_crw_dev_regions(struct vfio_ccw_private *private); + +struct vfio_ccw_crw { + struct list_head next; + struct crw crw; +}; + +/** + * 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 + * @crw_region: MMIO region for getting channel report words + * @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; + struct ccw_crw_region *crw_region; + int num_regions; + + struct channel_program cp; + struct irb irb; + union scsw scsw; + struct list_head crw; + + struct eventfd_ctx *io_trigger; + struct eventfd_ctx *crw_trigger; + struct work_struct io_work; + struct work_struct crw_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 |