• Ingo Tuchscherer's avatar
    s390/zcrypt: add multi domain support · e28d2af4
    Ingo Tuchscherer authored
    Currently the ap infrastructure only supports one domain at a time.
    This feature extends the generic cryptographic device driver to
    support multiple cryptographic domains simultaneously.
    
    There are now card and queue devices on the AP bus with independent
    card and queue drivers. The new /sys layout is as follows:
    
    /sys/bus/ap
        devices
            <xx>.<yyyy> -> ../../../devices/ap/card<xx>/<xx>.<yyyy>
            ...
            card<xx> -> ../../../devices/ap/card<xx>
            ...
        drivers
            <drv>card
                card<xx> -> ../../../../devices/ap/card<xx>
            <drv>queue
                <xx>.<yyyy> -> ../../../../devices/ap/card<xx>/<xx>.<yyyy>
                ...
    
    /sys/devices/ap
        card<xx>
            <xx>.<yyyy>
                driver -> ../../../../bus/ap/drivers/<zzz>queue
                ...
            driver -> ../../../bus/ap/drivers/<drv>card
            ...
    
    The two digit <xx> field is the card number, the four digit <yyyy>
    field is the queue number and <drv> is the name of the device driver,
    e.g. "cex4".
    
    For compatability /sys/bus/ap/card<xx> for the old layout has to exist,
    including the attributes that used to reside there.
    
    With additional contributions from Harald Freudenberger and
    Martin Schwidefsky.
    Signed-off-by: default avatarIngo Tuchscherer <ingo.tuchscherer@linux.vnet.ibm.com>
    Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
    e28d2af4
ap_card.c 4.22 KB