s390/ap: Fix queue depth field length

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The queue depth field is defined as a 5 bit field in the Z architecture
instead of a 4 bit field.

The queue depth (qd) can be in range 0-31 and is reported in bits 59-63
of the TAPQ response. Currently this has no effect as all CEX generations
report a queue depth of 7, which fits into 4 bits. However, future CEX
generations reporting a value >15 would not be properly reflected by the
ap bus and therefore all user space applications relying on it.

Reviewed-by: Harald Freudenberger <freude@linux.ibm.com>
Signed-off-by: Finn Callies <fcallies@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

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Finn Callies 2026-07-23 17:00:38 +02:00 • committed by Vasily Gorbik

parent 2d6b38e661

commit bdce129e44

2 changed files with 3 additions and 3 deletions

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4

arch/s390/include/asm/ap.h

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2

drivers/s390/crypto/ap_bus.h

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