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| author | Stefan Haberland <sth@linux.vnet.ibm.com> | 2016-08-08 15:56:54 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2016-12-12 12:05:03 +0100 |
| commit | a521b048bc8c5d3c57a468c2cba70eb60e873616 (patch) | |
| tree | d84e42b5653a1761a5cf7307ab4fef0e884f1c07 /drivers/s390/block/dasd_eckd.h | |
| parent | c93461515a1a16486f4e483cb34170366fa73ea1 (diff) | |
| download | lwn-a521b048bc8c5d3c57a468c2cba70eb60e873616.tar.gz lwn-a521b048bc8c5d3c57a468c2cba70eb60e873616.zip | |
s390/dasd: channel path aware error recovery
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>
Diffstat (limited to 'drivers/s390/block/dasd_eckd.h')
| -rw-r--r-- | drivers/s390/block/dasd_eckd.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/s390/block/dasd_eckd.h b/drivers/s390/block/dasd_eckd.h index e491f4416e40..e2a710c250a5 100644 --- a/drivers/s390/block/dasd_eckd.h +++ b/drivers/s390/block/dasd_eckd.h @@ -94,6 +94,8 @@ #define FCX_MAX_DATA_FACTOR 65536 #define DASD_ECKD_RCD_DATA_SIZE 256 +#define DASD_ECKD_PATH_THRHLD 256 +#define DASD_ECKD_PATH_INTERVAL 300 /***************************************************************************** * SECTION: Type Definitions |