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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/powerpc/platforms/pseries/papr-hvpipe.h
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/* SPDX-License-Identifier: GPL-2.0-only */

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#ifndef _PAPR_HVPIPE_H

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#define _PAPR_HVPIPE_H

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#define	HVPIPE_HMC_ID_MASK	0x02000000 /*02-HMC,00-reserved and HMC ID */

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#define	HVPIPE_MAX_WRITE_BUFFER_SIZE	4048

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/*

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 * hvpipe specific RTAS return values

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 */

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#define	RTAS_HVPIPE_CLOSED		-4

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#define	HVPIPE_HDR_LEN	sizeof(struct papr_hvpipe_hdr)

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enum hvpipe_migrate_action {

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	HVPIPE_SUSPEND,

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	HVPIPE_RESUME,

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};

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struct hvpipe_source_info {

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	struct list_head list;	/* list of sources */

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	u32 srcID;

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	u32 hvpipe_status;

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	wait_queue_head_t recv_wqh;	 /* wake up poll() waitq */

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	struct task_struct *tsk;

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};

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/*

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 * Source ID Format 0xCCRRQQQQ

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 * CC = indicating value is source type (ex: 0x02 for HMC)

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 * RR = 0x00 (reserved)

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 * QQQQ = 0x0000 – 0xFFFF indicating the source index indetifier

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 */

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struct hvpipe_event_buf {

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	__be32	srcID;		/* Source ID */

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	u8	event_type;	/* 0x01 for hvpipe message available */

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				/* from specified src ID */

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				/* 0x02 for loss of pipe connection */

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				/* with specified src ID */

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};

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void hvpipe_migration_handler(int action);

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#endif /* _PAPR_HVPIPE_H */

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