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| author | Stefan Haberland <sth@linux.ibm.com> | 2023-04-05 17:20:13 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2023-04-12 04:53:08 +0300 |
| commit | 9558a8e9d4a681e67b3abe9cabf3e3d8825af57e (patch) | |
| tree | 6381ffc80b5a8d799a44671ca766b4f46bdbddfc /drivers/s390/block/dasd_int.h | |
| parent | 1cee2975bbabd89df1097c354867192106b058ea (diff) | |
| download | linux-9558a8e9d4a681e67b3abe9cabf3e3d8825af57e.tar.xz | |
s390/dasd: add aq_mask sysfs attribute
Add sysfs attribute that controls the DASD autoquiesce feature.
The autoquiesce is disabled when 0 is echoed to the attribute.
A value greater than 0 will enable the feature.
The aq_mask attribute will accept an unsigned integer and the value
will be interpreted as bitmask defining the trigger events that will
lead to an automatic quiesce.
The following autoquiesce triggers will currently be available:
DASD_EER_FATALERROR 1 - any final I/O error
DASD_EER_NOPATH 2 - no remaining paths for the device
DASD_EER_STATECHANGE 3 - a state change interrupt occurred
DASD_EER_PPRCSUSPEND 4 - the device is PPRC suspended
DASD_EER_NOSPC 5 - there is no space remaining on an ESE device
DASD_EER_TIMEOUT 6 - a certain amount of timeouts occurred
DASD_EER_STARTIO 7 - the IO start function encountered an error
The currently supported maximum value is 255.
Bit 31 is reserved for internal usage.
Bit 0 is not used.
Example:
- deactivate autoquiesce
$ echo 0 > /sys/bus/ccw/0.0.1234/aq_mask
- enable autoquiesce for FATALERROR, NOPATH and TIMEOUT
(0000 0000 0000 0000 0000 0000 0100 0110 => 70)
$ echo 70 > /sys/bus/ccw/0.0.1234/aq_mask
Signed-off-by: Stefan Haberland <sth@linux.ibm.com>
Reviewed-by: Jan Hoeppner <hoeppner@linux.ibm.com>
Reviewed-by: Halil Pasic <pasic@linux.ibm.com>
Link: https://lore.kernel.org/r/20230405142017.2446986-4-sth@linux.ibm.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/s390/block/dasd_int.h')
| -rw-r--r-- | drivers/s390/block/dasd_int.h | 23 |
1 files changed, 16 insertions, 7 deletions
diff --git a/drivers/s390/block/dasd_int.h b/drivers/s390/block/dasd_int.h index d0ff4528d489..c4633a4aeeb1 100644 --- a/drivers/s390/block/dasd_int.h +++ b/drivers/s390/block/dasd_int.h @@ -444,13 +444,22 @@ struct dasd_discipline { extern struct dasd_discipline *dasd_diag_discipline_pointer; -/* Trigger IDs for extended error reporting */ -#define DASD_EER_FATALERROR 1 -#define DASD_EER_NOPATH 2 -#define DASD_EER_STATECHANGE 3 -#define DASD_EER_PPRCSUSPEND 4 -#define DASD_EER_NOSPC 5 -#define DASD_EER_AUTOQUIESCE 31 +/* Trigger IDs for extended error reporting DASD EER and autoquiesce */ +enum eer_trigger { + DASD_EER_FATALERROR = 1, + DASD_EER_NOPATH, + DASD_EER_STATECHANGE, + DASD_EER_PPRCSUSPEND, + DASD_EER_NOSPC, + DASD_EER_TIMEOUTS, + DASD_EER_STARTIO, + + /* enum end marker, only add new trigger above */ + DASD_EER_MAX, + DASD_EER_AUTOQUIESCE = 31, /* internal only */ +}; + +#define DASD_EER_VALID ((1U << DASD_EER_MAX) - 1) /* DASD path handling */ |