On Wed, 5 Apr 2023 16:20:13 +0200 Stefan Haberland <sth@xxxxxxxxxxxxx> wrote: > 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@xxxxxxxxxxxxx> > Reviewed-by: Jan Hoeppner <hoeppner@xxxxxxxxxxxxx> Reviewed-by: Halil Pasic <pasic@xxxxxxxxxxxxx> [..]
