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s390/dasd: channel path aware error recovery

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With this feature, the DASD device driver more robustly handles DASDs
that are attached via multiple channel paths and are subject to
constant Interface-Control-Checks (IFCCs) and Channel-Control-Checks
(CCCs) or loss of High-Performance-FICON (HPF) functionality on one or
more of these paths.

If a channel path does not work correctly, it is removed from normal
operation as long as other channel paths are available. All extended
error recovery states can be queried and reset via user space
interfaces.

Signed-off-by: Stefan Haberland <sth@linux.vnet.ibm.com>
Reviewed-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Reviewed-by: Jan Hoeppner <hoeppner@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Stefan Haberland
2016-08-08 15:56:54 +02:00
committed by Martin Schwidefsky
parent c93461515a
commit a521b048bc
7 changed files with 559 additions and 139 deletions
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6
arch/s390/include/asm/scsw.h
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@@ -96,7 +96,8 @@ struct tm_scsw {
u32 dstat:8;
u32 cstat:8;
u32 fcxs:8;
u32 schxs:8;
u32 ifob:1;
u32 sesq:7;
} __attribute__ ((packed));
/**
@@ -177,6 +178,9 @@ union scsw {
#define SCHN_STAT_INTF_CTRL_CHK 0x02
#define SCHN_STAT_CHAIN_CHECK 0x01
#define SCSW_SESQ_DEV_NOFCX 3
#define SCSW_SESQ_PATH_NOFCX 4
/*
* architectured values for first sense byte
*/