b4563e891a
To fetch a pending channel report word (crw) we use a kernel thread which triggers stcrw and sleeps on a semaphore. The s390 machine check handler uses crw_handle_channel_report to handle one crw if needed. This patch replaces the semaphore with a waitqueue (to block the kernel thread) and an atomic_t (to count the number of pending requests). By this we achieve the ability to force this thread to check for a pending crw (independent on when it is triggered by the machine check handler) and wait for this action to finish. Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
70 lines
2.0 KiB
C
70 lines
2.0 KiB
C
/*
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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 <adlung@de.ibm.com>,
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* Martin Schwidefsky <schwidefsky@de.ibm.com>,
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* Cornelia Huck <cornelia.huck@de.ibm.com>,
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* Heiko Carstens <heiko.carstens@de.ibm.com>,
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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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