/* SPDX-License-Identifier: GPL-2.0-only */
#ifndef _PAPR_HVPIPE_H
#define _PAPR_HVPIPE_H

#define HVPIPE_HMC_ID_MASK      0x02000000 /*02-HMC,00-reserved and HMC ID */
#define HVPIPE_MAX_WRITE_BUFFER_SIZE    4048
/*
 * hvpipe specific RTAS return values
 */
#define RTAS_HVPIPE_CLOSED              -4

#define HVPIPE_HDR_LEN  sizeof(struct papr_hvpipe_hdr)

enum hvpipe_migrate_action {
        HVPIPE_SUSPEND,
        HVPIPE_RESUME,
};

struct hvpipe_source_info {
        struct list_head list;  /* list of sources */
        u32 srcID;
        u32 hvpipe_status;
        wait_queue_head_t recv_wqh;      /* wake up poll() waitq */
        struct task_struct *tsk;
};

/*
 * Source ID Format 0xCCRRQQQQ
 * CC = indicating value is source type (ex: 0x02 for HMC)
 * RR = 0x00 (reserved)
 * QQQQ = 0x0000 – 0xFFFF indicating the source index indetifier
 */
struct hvpipe_event_buf {
        __be32  srcID;          /* Source ID */
        u8      event_type;     /* 0x01 for hvpipe message available */
                                /* from specified src ID */
                                /* 0x02 for loss of pipe connection */
                                /* with specified src ID */
};

void hvpipe_migration_handler(int action);
#endif /* _PAPR_HVPIPE_H */