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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/s390/include/asm/crw.h
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/*

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 *   Data definitions for channel report processing

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 *    Copyright IBM Corp. 2000,2009

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 *    Author(s): Ingo Adlung <[email protected]>,

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 *		 Martin Schwidefsky <[email protected]>,

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 *		 Cornelia Huck <[email protected]>,

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 *		 Heiko Carstens <[email protected]>,

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 */

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#ifndef _ASM_S390_CRW_H

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#define _ASM_S390_CRW_H

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#include <linux/types.h>

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/*

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 * Channel Report Word

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 */

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struct crw {

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	__u32 res1 :  1;   /* reserved zero */

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	__u32 slct :  1;   /* solicited */

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	__u32 oflw :  1;   /* overflow */

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	__u32 chn  :  1;   /* chained */

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	__u32 rsc  :  4;   /* reporting source code */

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	__u32 anc  :  1;   /* ancillary report */

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	__u32 res2 :  1;   /* reserved zero */

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	__u32 erc  :  6;   /* error-recovery code */

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	__u32 rsid : 16;   /* reporting-source ID */

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} __attribute__ ((packed));

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typedef void (*crw_handler_t)(struct crw *, struct crw *, int);

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extern int crw_register_handler(int rsc, crw_handler_t handler);

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extern void crw_unregister_handler(int rsc);

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extern void crw_handle_channel_report(void);

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void crw_wait_for_channel_report(void);

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#define NR_RSCS 16

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#define CRW_RSC_MONITOR  0x2  /* monitoring facility */

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#define CRW_RSC_SCH	 0x3  /* subchannel */

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#define CRW_RSC_CPATH	 0x4  /* channel path */

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#define CRW_RSC_CONFIG	 0x9  /* configuration-alert facility */

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#define CRW_RSC_CSS	 0xB  /* channel subsystem */

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#define CRW_ERC_EVENT	 0x00 /* event information pending */

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#define CRW_ERC_AVAIL	 0x01 /* available */

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#define CRW_ERC_INIT	 0x02 /* initialized */

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#define CRW_ERC_TERROR	 0x03 /* temporary error */

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#define CRW_ERC_IPARM	 0x04 /* installed parm initialized */

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#define CRW_ERC_TERM	 0x05 /* terminal */

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#define CRW_ERC_PERRN	 0x06 /* perm. error, fac. not init */

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#define CRW_ERC_PERRI	 0x07 /* perm. error, facility init */

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#define CRW_ERC_PMOD	 0x08 /* installed parameters modified */

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static inline int stcrw(struct crw *pcrw)

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{

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	int ccode;

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	asm volatile(

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		"	stcrw	0(%2)\n"

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		"	ipm	%0\n"

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		"	srl	%0,28\n"

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		: "=d" (ccode), "=m" (*pcrw)

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		: "a" (pcrw)

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		: "cc" );

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	return ccode;

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}

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#endif /* _ASM_S390_CRW_H */

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